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|
/*
This file is part of libmicrohttpd
Copyright (C) 2007-2016 Daniel Pittman and Christian Grothoff
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file microhttpd/daemon.c
* @brief A minimal-HTTP server library
* @author Daniel Pittman
* @author Christian Grothoff
*/
#include "platform.h"
#include "mhd_threads.h"
#include "internal.h"
#include "response.h"
#include "connection.h"
#include "memorypool.h"
#include "mhd_limits.h"
#include "autoinit_funcs.h"
#include "mhd_mono_clock.h"
#include "mhd_locks.h"
#include "mhd_sockets.h"
#include "mhd_itc.h"
#include "mhd_compat.h"
#if HAVE_SEARCH_H
#include <search.h>
#else
#include "tsearch.h"
#endif
#if HTTPS_SUPPORT
#include "connection_https.h"
#include <gcrypt.h>
#endif
#ifdef LINUX
#include <sys/sendfile.h>
#endif
#ifdef _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif /* !WIN32_LEAN_AND_MEAN */
#include <windows.h>
#endif
/**
* Default connection limit.
*/
#ifdef MHD_POSIX_SOCKETS
#define MHD_MAX_CONNECTIONS_DEFAULT (FD_SETSIZE - 4)
#else
#define MHD_MAX_CONNECTIONS_DEFAULT (FD_SETSIZE - 2)
#endif
/**
* Default memory allowed per connection.
*/
#define MHD_POOL_SIZE_DEFAULT (32 * 1024)
/**
* Print extra messages with reasons for closing
* sockets? (only adds non-error messages).
*/
#define DEBUG_CLOSE MHD_NO
/**
* Print extra messages when establishing
* connections? (only adds non-error messages).
*/
#define DEBUG_CONNECT MHD_NO
/**
* Default implementation of the panic function,
* prints an error message and aborts.
*
* @param cls unused
* @param file name of the file with the problem
* @param line line number with the problem
* @param reason error message with details
*/
static void
mhd_panic_std (void *cls,
const char *file,
unsigned int line,
const char *reason)
{
#ifdef HAVE_MESSAGES
fprintf (stderr,
_("Fatal error in GNU libmicrohttpd %s:%u: %s\n"),
file,
line,
reason);
#endif
abort ();
}
/**
* Handler for fatal errors.
*/
MHD_PanicCallback mhd_panic;
/**
* Closure argument for #mhd_panic.
*/
void *mhd_panic_cls;
#ifdef _WIN32
/**
* Track initialization of winsock
*/
static int mhd_winsock_inited_ = 0;
#endif
/**
* Trace up to and return master daemon. If the supplied daemon
* is a master, then return the daemon itself.
*
* @param daemon handle to a daemon
* @return master daemon handle
*/
static struct MHD_Daemon*
MHD_get_master (struct MHD_Daemon *daemon)
{
while (NULL != daemon->master)
daemon = daemon->master;
return daemon;
}
/**
* Maintain connection count for single address.
*/
struct MHD_IPCount
{
/**
* Address family. AF_INET or AF_INET6 for now.
*/
int family;
/**
* Actual address.
*/
union
{
/**
* IPv4 address.
*/
struct in_addr ipv4;
#if HAVE_INET6
/**
* IPv6 address.
*/
struct in6_addr ipv6;
#endif
} addr;
/**
* Counter.
*/
unsigned int count;
};
/**
* Lock shared structure for IP connection counts and connection DLLs.
*
* @param daemon handle to daemon where lock is
*/
static void
MHD_ip_count_lock (struct MHD_Daemon *daemon)
{
MHD_mutex_lock_chk_(&daemon->per_ip_connection_mutex);
}
/**
* Unlock shared structure for IP connection counts and connection DLLs.
*
* @param daemon handle to daemon where lock is
*/
static void
MHD_ip_count_unlock (struct MHD_Daemon *daemon)
{
MHD_mutex_unlock_chk_(&daemon->per_ip_connection_mutex);
}
/**
* Tree comparison function for IP addresses (supplied to tsearch() family).
* We compare everything in the struct up through the beginning of the
* 'count' field.
*
* @param a1 first address to compare
* @param a2 second address to compare
* @return -1, 0 or 1 depending on result of compare
*/
static int
MHD_ip_addr_compare (const void *a1,
const void *a2)
{
return memcmp (a1,
a2,
offsetof (struct MHD_IPCount,
count));
}
/**
* Parse address and initialize @a key using the address.
*
* @param addr address to parse
* @param addrlen number of bytes in @a addr
* @param key where to store the parsed address
* @return #MHD_YES on success and #MHD_NO otherwise (e.g., invalid address type)
*/
static int
MHD_ip_addr_to_key (const struct sockaddr *addr,
socklen_t addrlen,
struct MHD_IPCount *key)
{
memset(key,
0,
sizeof(*key));
/* IPv4 addresses */
if (sizeof (struct sockaddr_in) == addrlen)
{
const struct sockaddr_in *addr4 = (const struct sockaddr_in*) addr;
key->family = AF_INET;
memcpy (&key->addr.ipv4,
&addr4->sin_addr,
sizeof(addr4->sin_addr));
return MHD_YES;
}
#if HAVE_INET6
/* IPv6 addresses */
if (sizeof (struct sockaddr_in6) == addrlen)
{
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*) addr;
key->family = AF_INET6;
memcpy (&key->addr.ipv6,
&addr6->sin6_addr,
sizeof(addr6->sin6_addr));
return MHD_YES;
}
#endif
/* Some other address */
return MHD_NO;
}
/**
* Check if IP address is over its limit in terms of the number
* of allowed concurrent connections. If the IP is still allowed,
* increments the connection counter.
*
* @param daemon handle to daemon where connection counts are tracked
* @param addr address to add (or increment counter)
* @param addrlen number of bytes in @a addr
* @return Return #MHD_YES if IP below limit, #MHD_NO if IP has surpassed limit.
* Also returns #MHD_NO if fails to allocate memory.
*/
static int
MHD_ip_limit_add (struct MHD_Daemon *daemon,
const struct sockaddr *addr,
socklen_t addrlen)
{
struct MHD_IPCount *key;
void **nodep;
void *node;
int result;
daemon = MHD_get_master (daemon);
/* Ignore if no connection limit assigned */
if (0 == daemon->per_ip_connection_limit)
return MHD_YES;
if (NULL == (key = malloc (sizeof(*key))))
return MHD_NO;
/* Initialize key */
if (MHD_NO == MHD_ip_addr_to_key (addr,
addrlen,
key))
{
/* Allow unhandled address types through */
free (key);
return MHD_YES;
}
MHD_ip_count_lock (daemon);
/* Search for the IP address */
if (NULL == (nodep = tsearch (key,
&daemon->per_ip_connection_count,
&MHD_ip_addr_compare)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to add IP connection count node\n"));
#endif
MHD_ip_count_unlock (daemon);
free (key);
return MHD_NO;
}
node = *nodep;
/* If we got an existing node back, free the one we created */
if (node != key)
free(key);
key = (struct MHD_IPCount *) node;
/* Test if there is room for another connection; if so,
* increment count */
result = (key->count < daemon->per_ip_connection_limit) ? MHD_YES : MHD_NO;
if (MHD_YES == result)
++key->count;
MHD_ip_count_unlock (daemon);
return result;
}
/**
* Decrement connection count for IP address, removing from table
* count reaches 0.
*
* @param daemon handle to daemon where connection counts are tracked
* @param addr address to remove (or decrement counter)
* @param addrlen number of bytes in @a addr
*/
static void
MHD_ip_limit_del (struct MHD_Daemon *daemon,
const struct sockaddr *addr,
socklen_t addrlen)
{
struct MHD_IPCount search_key;
struct MHD_IPCount *found_key;
void **nodep;
daemon = MHD_get_master (daemon);
/* Ignore if no connection limit assigned */
if (0 == daemon->per_ip_connection_limit)
return;
/* Initialize search key */
if (MHD_NO == MHD_ip_addr_to_key (addr,
addrlen,
&search_key))
return;
MHD_ip_count_lock (daemon);
/* Search for the IP address */
if (NULL == (nodep = tfind (&search_key,
&daemon->per_ip_connection_count,
&MHD_ip_addr_compare)))
{
/* Something's wrong if we couldn't find an IP address
* that was previously added */
MHD_PANIC (_("Failed to find previously-added IP address\n"));
}
found_key = (struct MHD_IPCount *) *nodep;
/* Validate existing count for IP address */
if (0 == found_key->count)
{
MHD_PANIC (_("Previously-added IP address had counter of zero\n"));
}
/* Remove the node entirely if count reduces to 0 */
if (0 == --found_key->count)
{
tdelete (found_key,
&daemon->per_ip_connection_count,
&MHD_ip_addr_compare);
free (found_key);
}
MHD_ip_count_unlock (daemon);
}
#if HTTPS_SUPPORT
/**
* Callback for receiving data from the socket.
*
* @param connection the MHD_Connection structure
* @param other where to write received data to
* @param i maximum size of other (in bytes)
* @return number of bytes actually received
*/
static ssize_t
recv_tls_adapter (struct MHD_Connection *connection,
void *other,
size_t i)
{
ssize_t res;
if (MHD_YES == connection->tls_read_ready)
{
connection->daemon->num_tls_read_ready--;
connection->tls_read_ready = MHD_NO;
}
res = gnutls_record_recv (connection->tls_session,
other,
(i > SSIZE_MAX) ? SSIZE_MAX : i);
if ( (GNUTLS_E_AGAIN == res) ||
(GNUTLS_E_INTERRUPTED == res) )
{
MHD_socket_set_error_ (MHD_SCKT_EINTR_);
#ifdef EPOLL_SUPPORT
connection->epoll_state &= ~MHD_EPOLL_STATE_READ_READY;
#endif
return -1;
}
if (res < 0)
{
/* Likely 'GNUTLS_E_INVALID_SESSION' (client communication
disrupted); set errno to something caller will interpret
correctly as a hard error */
MHD_socket_set_error_ (MHD_SCKT_ECONNRESET_);
return res;
}
if ((size_t)res == i)
{
connection->tls_read_ready = MHD_YES;
connection->daemon->num_tls_read_ready++;
}
return res;
}
/**
* Callback for writing data to the socket.
*
* @param connection the MHD connection structure
* @param other data to write
* @param i number of bytes to write
* @return actual number of bytes written
*/
static ssize_t
send_tls_adapter (struct MHD_Connection *connection,
const void *other,
size_t i)
{
int res;
res = gnutls_record_send (connection->tls_session,
other,
(i > SSIZE_MAX) ? SSIZE_MAX : i);
if ( (GNUTLS_E_AGAIN == res) ||
(GNUTLS_E_INTERRUPTED == res) )
{
MHD_socket_set_error_ (MHD_SCKT_EINTR_);
#ifdef EPOLL_SUPPORT
connection->epoll_state &= ~MHD_EPOLL_STATE_WRITE_READY;
#endif
return -1;
}
if (res < 0)
{
/* some other GNUTLS error, should set 'errno'; as we do not
really understand the error (not listed in GnuTLS
documentation explicitly), we set 'errno' to something that
will cause the connection to fail. */
MHD_socket_set_error_ (MHD_SCKT_ECONNRESET_);
return -1;
}
return res;
}
/**
* Read and setup our certificate and key.
*
* @param daemon handle to daemon to initialize
* @return 0 on success
*/
static int
MHD_init_daemon_certificate (struct MHD_Daemon *daemon)
{
gnutls_datum_t key;
gnutls_datum_t cert;
int ret;
#if GNUTLS_VERSION_MAJOR >= 3
if (NULL != daemon->cert_callback)
{
gnutls_certificate_set_retrieve_function2 (daemon->x509_cred,
daemon->cert_callback);
}
#endif
if (NULL != daemon->https_mem_trust)
{
cert.data = (unsigned char *) daemon->https_mem_trust;
cert.size = strlen (daemon->https_mem_trust);
if (gnutls_certificate_set_x509_trust_mem (daemon->x509_cred,
&cert,
GNUTLS_X509_FMT_PEM) < 0)
{
#ifdef HAVE_MESSAGES
MHD_DLOG(daemon,
"Bad trust certificate format\n");
#endif
return -1;
}
}
if (MHD_YES == daemon->have_dhparams)
{
gnutls_certificate_set_dh_params (daemon->x509_cred,
daemon->https_mem_dhparams);
}
/* certificate & key loaded from memory */
if ( (NULL != daemon->https_mem_cert) &&
(NULL != daemon->https_mem_key) )
{
key.data = (unsigned char *) daemon->https_mem_key;
key.size = strlen (daemon->https_mem_key);
cert.data = (unsigned char *) daemon->https_mem_cert;
cert.size = strlen (daemon->https_mem_cert);
if (NULL != daemon->https_key_password) {
#if GNUTLS_VERSION_NUMBER >= 0x030111
ret = gnutls_certificate_set_x509_key_mem2 (daemon->x509_cred,
&cert,
&key,
GNUTLS_X509_FMT_PEM,
daemon->https_key_password,
0);
#else
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to setup x509 certificate/key: pre 3.X.X version " \
"of GnuTLS does not support setting key password"));
#endif
return -1;
#endif
}
else
ret = gnutls_certificate_set_x509_key_mem (daemon->x509_cred,
&cert,
&key,
GNUTLS_X509_FMT_PEM);
#ifdef HAVE_MESSAGES
if (0 != ret)
MHD_DLOG (daemon,
"GnuTLS failed to setup x509 certificate/key: %s\n",
gnutls_strerror (ret));
#endif
return ret;
}
#if GNUTLS_VERSION_MAJOR >= 3
if (NULL != daemon->cert_callback)
return 0;
#endif
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
"You need to specify a certificate and key location\n");
#endif
return -1;
}
/**
* Initialize security aspects of the HTTPS daemon
*
* @param daemon handle to daemon to initialize
* @return 0 on success
*/
static int
MHD_TLS_init (struct MHD_Daemon *daemon)
{
switch (daemon->cred_type)
{
case GNUTLS_CRD_CERTIFICATE:
if (0 !=
gnutls_certificate_allocate_credentials (&daemon->x509_cred))
return GNUTLS_E_MEMORY_ERROR;
return MHD_init_daemon_certificate (daemon);
default:
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Error: invalid credentials type %d specified.\n"),
daemon->cred_type);
#endif
return -1;
}
}
#endif
#undef MHD_get_fdset
/**
* Obtain the `select()` sets for this daemon.
* Daemon's FDs will be added to fd_sets. To get only
* daemon FDs in fd_sets, call FD_ZERO for each fd_set
* before calling this function. FD_SETSIZE is assumed
* to be platform's default.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call or any FD didn't
* fit fd_set.
* @ingroup event
*/
int
MHD_get_fdset (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd)
{
return MHD_get_fdset2 (daemon,
read_fd_set,
write_fd_set,
except_fd_set,
max_fd,
_MHD_SYS_DEFAULT_FD_SETSIZE);
}
#if HTTPS_SUPPORT
/**
* Obtain the select() file descriptor sets for the
* given @a urh.
*
* @param urh upgrade handle to wait for
* @param[out] rs read set to initialize
* @param[out] ws write set to initialize
* @param[out] max_fd maximum FD to update
* @param fd_setsize value of FD_SETSIZE
* @return #MHD_YES on success, #MHD_NO on error
*/
static int
urh_to_fdset (struct MHD_UpgradeResponseHandle *urh,
fd_set *rs,
fd_set *ws,
MHD_socket *max_fd,
unsigned int fd_setsize)
{
if ( (urh->out_buffer_used < urh->out_buffer_size) &&
(MHD_INVALID_SOCKET != urh->mhd.socket) &&
(! MHD_add_to_fd_set_ (urh->mhd.socket,
rs,
max_fd,
fd_setsize)) )
return MHD_NO;
if ( (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->mhd.celi)) &&
(MHD_INVALID_SOCKET != urh->mhd.socket) &&
(! MHD_add_to_fd_set_ (urh->mhd.socket,
ws,
max_fd,
fd_setsize)) )
return MHD_NO;
if ( (urh->in_buffer_used < urh->in_buffer_size) &&
(MHD_INVALID_SOCKET != urh->connection->socket_fd) &&
(! MHD_add_to_fd_set_ (urh->connection->socket_fd,
rs,
max_fd,
fd_setsize)) )
return MHD_NO;
if ( (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->app.celi)) &&
(MHD_INVALID_SOCKET != urh->connection->socket_fd) &&
(! MHD_add_to_fd_set_ (urh->connection->socket_fd,
ws,
max_fd,
fd_setsize)) )
return MHD_NO;
return MHD_YES;
}
/**
* Update the @a urh based on the ready FDs in the @a rs and @a ws.
*
* @param urh upgrade handle to update
* @param rs read result from select()
* @param ws write result from select()
*/
static void
urh_from_fdset (struct MHD_UpgradeResponseHandle *urh,
const fd_set *rs,
const fd_set *ws)
{
const MHD_socket mhd_sckt = urh->mhd.socket;
const MHD_socket conn_sckt = urh->connection->socket_fd;
if ((MHD_INVALID_SOCKET != conn_sckt) &&
FD_ISSET (conn_sckt, rs))
urh->app.celi |= MHD_EPOLL_STATE_READ_READY;
if ((MHD_INVALID_SOCKET != conn_sckt) &&
FD_ISSET (conn_sckt, ws))
urh->app.celi |= MHD_EPOLL_STATE_WRITE_READY;
if ((MHD_INVALID_SOCKET != mhd_sckt) &&
FD_ISSET (mhd_sckt, rs))
urh->mhd.celi |= MHD_EPOLL_STATE_READ_READY;
if ((MHD_INVALID_SOCKET != mhd_sckt) &&
FD_ISSET (mhd_sckt, ws))
urh->mhd.celi |= MHD_EPOLL_STATE_WRITE_READY;
}
#endif
/**
* Obtain the `select()` sets for this daemon.
* Daemon's FDs will be added to fd_sets. To get only
* daemon FDs in fd_sets, call FD_ZERO for each fd_set
* before calling this function. Passing custom FD_SETSIZE
* as @a fd_setsize allow usage of larger/smaller than
* platform's default fd_sets.
*
* @param daemon daemon to get sets from
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set
* @param max_fd increased to largest FD added (if larger
* than existing value); can be NULL
* @param fd_setsize value of FD_SETSIZE
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call or any FD didn't
* fit fd_set.
* @ingroup event
*/
int
MHD_get_fdset2 (struct MHD_Daemon *daemon,
fd_set *read_fd_set,
fd_set *write_fd_set,
fd_set *except_fd_set,
MHD_socket *max_fd,
unsigned int fd_setsize)
{
struct MHD_Connection *pos;
struct MHD_Connection *posn;
int result = MHD_YES;
if ( (NULL == daemon) ||
(NULL == read_fd_set) ||
(NULL == write_fd_set) ||
(MHD_YES == daemon->shutdown) ||
(0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
(0 != (daemon->options & MHD_USE_POLL)))
return MHD_NO;
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
/* we're in epoll mode, use the epoll FD as a stand-in for
the entire event set */
return MHD_add_to_fd_set_ (daemon->epoll_fd,
read_fd_set,
max_fd,
fd_setsize) ? MHD_YES : MHD_NO;
}
#endif
if ( (MHD_INVALID_SOCKET != daemon->socket_fd) &&
(! MHD_add_to_fd_set_ (daemon->socket_fd,
read_fd_set,
max_fd,
fd_setsize)) )
result = MHD_NO;
for (pos = daemon->connections_head; NULL != pos; pos = posn)
{
posn = pos->next;
switch (pos->event_loop_info)
{
case MHD_EVENT_LOOP_INFO_READ:
if (! MHD_add_to_fd_set_ (pos->socket_fd,
read_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
break;
case MHD_EVENT_LOOP_INFO_WRITE:
if (! MHD_add_to_fd_set_ (pos->socket_fd,
write_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
if ( (pos->read_buffer_size > pos->read_buffer_offset) &&
! MHD_add_to_fd_set_ (pos->socket_fd,
read_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
break;
case MHD_EVENT_LOOP_INFO_BLOCK:
if ( (pos->read_buffer_size > pos->read_buffer_offset) &&
! MHD_add_to_fd_set_ (pos->socket_fd,
read_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
break;
case MHD_EVENT_LOOP_INFO_CLEANUP:
/* this should never happen */
break;
}
}
#if HTTPS_SUPPORT
{
struct MHD_UpgradeResponseHandle *urh;
for (urh = daemon->urh_head; NULL != urh; urh = urh->next)
{
if (MHD_NO ==
urh_to_fdset (urh,
read_fd_set,
write_fd_set,
max_fd,
fd_setsize))
result = MHD_NO;
}
}
#endif
#if DEBUG_CONNECT
#ifdef HAVE_MESSAGES
if (NULL != max_fd)
MHD_DLOG (daemon,
_("Maximum socket in select set: %d\n"),
*max_fd);
#endif
#endif
return result;
}
/**
* Call the handlers for a connection in the appropriate order based
* on the readiness as detected by the event loop.
*
* @param con connection to handle
* @param read_ready set if the socket is ready for reading
* @param write_ready set if the socket is ready for writing
* @param force_close set if a hard error was detected on the socket;
* if this information is not available, simply pass #MHD_NO
* @return #MHD_YES to continue normally,
* #MHD_NO if a serious error was encountered and the
* connection is to be closed.
*/
static int
call_handlers (struct MHD_Connection *con,
int read_ready,
int write_ready,
int force_close)
{
struct MHD_Daemon *daemon = con->daemon;
int had_response_before_idle;
int ret;
#if HTTPS_SUPPORT
if (MHD_YES == con->tls_read_ready)
read_ready = MHD_YES;
#endif
if (read_ready)
con->read_handler (con);
if (write_ready)
con->write_handler (con);
had_response_before_idle = (NULL != con->response);
if (force_close)
MHD_connection_close_ (con,
MHD_REQUEST_TERMINATED_WITH_ERROR);
ret = con->idle_handler (con);
/* If we're in TURBO mode, and got a response object,
try opportunistically to just call write immediately. */
if ( (! force_close) &&
(MHD_YES == ret) &&
(0 != (daemon->options & MHD_USE_EPOLL_TURBO)) &&
(NULL != con->response) &&
(MHD_NO == had_response_before_idle) )
{
/* first 'write' gets the header, then 'idle'
readies the body, then 2nd 'write' may send
the body. */
con->write_handler (con);
if (MHD_YES == (ret = con->idle_handler (con)))
con->write_handler (con);
}
return ret;
}
/**
* Finally cleanup upgrade-related resources. It should
* be called when TLS buffers have been drained and
* application signaled MHD by #MHD_UPGRADE_ACTION_CLOSE.
*
* @param connection handle to the upgraded connection to clean
*/
void
MHD_cleanup_upgraded_connection_ (struct MHD_Connection *connection)
{
struct MHD_Daemon *daemon = connection->daemon;
struct MHD_UpgradeResponseHandle *urh = connection->urh;
#if HTTPS_SUPPORT
if ( (NULL != urh) &&
(0 != (daemon->options & MHD_USE_TLS)) )
{
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
DLL_remove (daemon->urh_head,
daemon->urh_tail,
urh);
#if EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
/* epoll documentation suggests that closing a FD
automatically removes it from the epoll set; however,
this is not true as if we fail to do manually remove it,
we are still seeing an event for this fd in epoll,
causing grief (use-after-free...) --- at least on my
system. */
if (0 != epoll_ctl (daemon->epoll_upgrade_fd,
EPOLL_CTL_DEL,
connection->socket_fd,
NULL))
MHD_PANIC (_("Failed to remove FD from epoll set\n"));
}
#endif /* EPOLL_SUPPORT */
if (MHD_INVALID_SOCKET != urh->mhd.socket)
{
/* epoll documentation suggests that closing a FD
automatically removes it from the epoll set; however,
this is not true as if we fail to do manually remove it,
we are still seeing an event for this fd in epoll,
causing grief (use-after-free...) --- at least on my
system. */
#if EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(0 != epoll_ctl (daemon->epoll_upgrade_fd,
EPOLL_CTL_DEL,
urh->mhd.socket,
NULL)) )
MHD_PANIC (_("Failed to remove FD from epoll set\n"));
#endif /* EPOLL_SUPPORT */
MHD_socket_close_chk_ (urh->mhd.socket);
}
if (MHD_INVALID_SOCKET != urh->app.socket)
MHD_socket_close_chk_ (urh->app.socket);
}
#endif /* HTTPS_SUPPORT */
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
/* resuming the connection will indirectly close it */
MHD_resume_connection (connection);
#if HTTPS_SUPPORT
if (0 != (daemon->options & MHD_USE_TLS))
{
gnutls_bye (connection->tls_session,
GNUTLS_SHUT_RDWR);
}
#endif
}
else
{
/* the thread would no longer close it */
MHD_connection_close_ (connection,
MHD_REQUEST_TERMINATED_COMPLETED_OK);
}
connection->urh = NULL;
if (NULL != urh)
free (urh);
}
#if HTTPS_SUPPORT
/**
* Performs bi-directional forwarding on upgraded HTTPS connections
* based on the readyness state stored in the @a urh handle.
*
* @param urh handle to process
*/
static void
process_urh (struct MHD_UpgradeResponseHandle *urh)
{
if (MHD_NO != urh->connection->daemon->shutdown)
{
/* Daemon shutting down, application will not receive any more data. */
urh->was_closed = MHD_YES;
}
if (MHD_NO != urh->was_closed)
{
/* Application was closed connections: no more data
* can be forwarded to application socket. */
if (0 < urh->in_buffer_used)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (urh->connection->daemon,
_("Failed to forward to application " MHD_UNSIGNED_LONG_LONG_PRINTF \
" bytes of data received from remote side: application shut down socket\n"),
(MHD_UNSIGNED_LONG_LONG) urh->in_buffer_used);
#endif
}
urh->in_buffer_size = 0;
urh->in_buffer_used = 0;
urh->mhd.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
/* Reading from remote client is not required anymore. */
urh->app.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
/* handle reading from TLS client and writing to application */
if ( (0 != (MHD_EPOLL_STATE_READ_READY & urh->app.celi)) &&
(urh->in_buffer_used < urh->in_buffer_size) )
{
ssize_t res;
size_t buf_size;
buf_size = urh->in_buffer_size - urh->in_buffer_used;
if (buf_size > SSIZE_MAX)
buf_size = SSIZE_MAX;
res = gnutls_record_recv (urh->connection->tls_session,
&urh->in_buffer[urh->in_buffer_used],
buf_size);
if ( (GNUTLS_E_AGAIN == res) ||
(GNUTLS_E_INTERRUPTED == res) )
{
urh->app.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
else if (res > 0)
{
urh->in_buffer_used += res;
}
else if (0 >= res)
{
/* Connection was shut down or got unrecoverable error.
* signal by shrinking buffer so no more attempts will be
* performed to receive data. */
urh->in_buffer_size = 0;
urh->app.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
}
if ( (0 != (MHD_EPOLL_STATE_WRITE_READY & urh->mhd.celi)) &&
(urh->in_buffer_used > 0) )
{
ssize_t res;
size_t data_size;
data_size = urh->in_buffer_used;
if (data_size > MHD_SCKT_SEND_MAX_SIZE_)
data_size = MHD_SCKT_SEND_MAX_SIZE_;
res = MHD_send_ (urh->mhd.socket,
urh->in_buffer,
data_size);
if (-1 == res)
{
int err = MHD_socket_get_error_ ();
if ( (MHD_SCKT_ERR_IS_EINTR_ (err)) ||
(MHD_SCKT_ERR_IS_EAGAIN_ (err)) )
urh->mhd.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
else if (! MHD_SCKT_ERR_IS_LOW_RESOURCES_(err))
{
/* persistent / unrecoverable error, treat as
if connection was shut down.
Do not try to receive to 'in_buffer' and
discard any unsent data. */
#ifdef HAVE_MESSAGES
MHD_DLOG (urh->connection->daemon,
_("Failed to forward to application " MHD_UNSIGNED_LONG_LONG_PRINTF \
" bytes of data received from remote side: %s\n"),
(MHD_UNSIGNED_LONG_LONG) urh->in_buffer_used,
MHD_socket_strerr_ (err));
#endif
urh->in_buffer_size = 0;
urh->in_buffer_used = 0;
urh->mhd.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
urh->app.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
}
else
{
if (urh->in_buffer_used != res)
{
memmove (urh->in_buffer,
&urh->in_buffer[res],
urh->in_buffer_used - res);
urh->in_buffer_used -= res;
}
else
{
urh->in_buffer_used = 0;
}
}
}
/* handle reading from application and writing to HTTPS client */
if ( ((0 != (MHD_EPOLL_STATE_READ_READY & urh->mhd.celi)) ||
(MHD_NO != urh->was_closed)) &&
(urh->out_buffer_used < urh->out_buffer_size) )
{
/* If application signaled MHD about socket closure then
* check for any pending data even if socket is not marked
* as 'ready' (signal may arrive after poll()/select()).
* Socketpair for forwarding is always in non-blocking mode
* so no risk that recv() will block the thread. */
ssize_t res;
size_t buf_size;
buf_size = urh->out_buffer_size - urh->out_buffer_used;
if (buf_size > MHD_SCKT_SEND_MAX_SIZE_)
buf_size = MHD_SCKT_SEND_MAX_SIZE_;
res = MHD_recv_ (urh->mhd.socket,
&urh->out_buffer[urh->out_buffer_used],
buf_size);
if (-1 == res)
{
if (MHD_NO != urh->was_closed)
{
/* Connection was shuted down or all data received and
* application will not forward any more data. */
urh->out_buffer_size = 0;
urh->mhd.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
else
{
const int err = MHD_socket_get_error_ ();
if ( (MHD_SCKT_ERR_IS_EINTR_ (err)) ||
(MHD_SCKT_ERR_IS_EAGAIN_ (err)) )
urh->mhd.celi &= ~MHD_EPOLL_STATE_READ_READY;
else if (! MHD_SCKT_ERR_IS_LOW_RESOURCES_(err))
{
/* persistent / unrecoverable error, treat as
if connection was shut down */
urh->out_buffer_size = 0;
urh->mhd.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
}
}
else
{
urh->out_buffer_used += res;
}
if (0 == res)
{
/* Connection was shut down or got unrecoverable error.
* signal by shrinking buffer so no more attempts will be
* performed to receive data. */
urh->out_buffer_size = 0;
urh->mhd.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
}
}
if ( (0 != (MHD_EPOLL_STATE_WRITE_READY & urh->app.celi)) &&
(urh->out_buffer_used > 0) )
{
ssize_t res;
size_t data_size;
data_size = urh->out_buffer_used;
if (data_size > SSIZE_MAX)
data_size = SSIZE_MAX;
res = gnutls_record_send (urh->connection->tls_session,
urh->out_buffer,
data_size);
if ( (GNUTLS_E_AGAIN == res) ||
(GNUTLS_E_INTERRUPTED == res) )
{
urh->app.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
}
else if (res > 0)
{
if (urh->out_buffer_used != res)
{
memmove (urh->out_buffer,
&urh->out_buffer[res],
urh->out_buffer_used - res);
urh->out_buffer_used -= res;
}
else
{
urh->out_buffer_used = 0;
}
}
else
{
/* persistent / unrecoverable error, treat as
if connection was shut down.
Do not try to receive to 'out_buffer' and
discard any unsent data. */
#ifdef HAVE_MESSAGES
MHD_DLOG (urh->connection->daemon,
_("Failed to forward to remote client " MHD_UNSIGNED_LONG_LONG_PRINTF \
" bytes of data received from application: %s\n"),
(MHD_UNSIGNED_LONG_LONG) urh->out_buffer_used,
gnutls_strerror(res));
#endif
urh->out_buffer_size = 0;
urh->out_buffer_used = 0;
urh->app.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
urh->mhd.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
}
if ( (MHD_NO != urh->connection->daemon->shutdown) &&
((0 != urh->out_buffer_size) ||
(0 != urh->out_buffer_used)) )
{
/* Daemon shutting down, discard any remaining forward data. */
#ifdef HAVE_MESSAGES
if (0 < urh->out_buffer_used)
MHD_DLOG (urh->connection->daemon,
_("Failed to forward to remote client " MHD_UNSIGNED_LONG_LONG_PRINTF \
" bytes of data received from application: daemon shut down\n"),
(MHD_UNSIGNED_LONG_LONG) urh->out_buffer_used);
#endif
urh->out_buffer_size = 0;
urh->out_buffer_used = 0;
urh->app.celi &= ~MHD_EPOLL_STATE_WRITE_READY;
urh->mhd.celi &= ~MHD_EPOLL_STATE_READ_READY;
}
/* cleanup connection if it was closed and all data was sent */
if ( (MHD_NO != urh->was_closed) &&
(0 == urh->out_buffer_size) &&
(0 == urh->out_buffer_used) )
{
MHD_cleanup_upgraded_connection_ (urh->connection);
}
}
#endif
/**
* Main function of the thread that handles an individual connection
* after it was "upgraded" when #MHD_USE_THREAD_PER_CONNECTION is set.
*
* @param con the connection this thread will handle
*/
static void
thread_main_connection_upgrade (struct MHD_Connection *con)
{
struct MHD_UpgradeResponseHandle *urh = con->urh;
#if HTTPS_SUPPORT
struct MHD_Daemon *daemon = con->daemon;
/* Here, we need to bi-directionally forward
until the application tells us that it is done
with the socket; */
if ( (0 != (daemon->options & MHD_USE_TLS)) &&
(0 == (daemon->options & MHD_USE_POLL)))
{
while (MHD_CONNECTION_UPGRADE == con->state)
{
/* use select */
fd_set rs;
fd_set ws;
MHD_socket max_fd;
int num_ready;
int result;
FD_ZERO (&rs);
FD_ZERO (&ws);
max_fd = MHD_INVALID_SOCKET;
result = urh_to_fdset (urh,
&rs,
&ws,
&max_fd,
FD_SETSIZE);
if (MHD_NO == result)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Error preparing select\n"));
#endif
break;
}
if (MHD_INVALID_SOCKET != max_fd)
num_ready = MHD_SYS_select_ (max_fd + 1,
&rs,
&ws,
NULL,
NULL);
else
num_ready = 0;
if (num_ready < 0)
{
const int err = MHD_socket_get_error_();
if (MHD_SCKT_ERR_IS_EINTR_(err))
continue;
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Error during select (%d): `%s'\n"),
err,
MHD_socket_strerr_ (err));
#endif
break;
}
urh_from_fdset (urh,
&rs,
&ws);
process_urh (urh);
if ( (0 == urh->in_buffer_size) &&
(0 == urh->out_buffer_size) &&
(0 == urh->in_buffer_used) &&
(0 == urh->out_buffer_used) )
break; /* connections died, we have no more purpose here */
}
}
#ifdef HAVE_POLL
else if (0 != (daemon->options & MHD_USE_TLS))
{
/* use poll() */
const unsigned int timeout = UINT_MAX;
while (MHD_CONNECTION_UPGRADE == con->state)
{
struct pollfd p[2];
memset (p,
0,
sizeof (struct pollfd) * 2);
p[0].fd = urh->connection->socket_fd;
p[1].fd = urh->mhd.socket;
if (urh->in_buffer_used < urh->in_buffer_size)
p[0].events |= POLLIN;
if (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->app.celi))
p[0].events |= POLLOUT;
if (urh->out_buffer_used < urh->out_buffer_size)
p[1].events |= POLLIN;
if (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->mhd.celi))
p[1].events |= POLLOUT;
if ( (0 != (p[0].events | p[1].events)) &&
(MHD_sys_poll_ (p,
2,
timeout) < 0) )
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_ (err))
continue;
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Error during poll: `%s'\n"),
MHD_socket_strerr_ (err));
#endif
break;
}
if (0 != (p[0].revents & POLLIN))
urh->app.celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (p[0].revents & POLLOUT))
urh->app.celi |= MHD_EPOLL_STATE_WRITE_READY;
if (0 != (p[1].revents & POLLIN))
urh->mhd.celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (p[1].revents & POLLOUT))
urh->mhd.celi |= MHD_EPOLL_STATE_WRITE_READY;
process_urh (urh);
if ( (0 == urh->in_buffer_size) &&
(0 == urh->out_buffer_size) &&
(0 == urh->in_buffer_used) &&
(0 == urh->out_buffer_used) )
break; /* connections died, we have no more purpose here */
}
}
/* end POLL */
#endif
/* end HTTPS */
#endif
}
/**
* Main function of the thread that handles an individual
* connection when #MHD_USE_THREAD_PER_CONNECTION is set.
*
* @param data the `struct MHD_Connection` this thread will handle
* @return always 0
*/
static MHD_THRD_RTRN_TYPE_ MHD_THRD_CALL_SPEC_
thread_main_handle_connection (void *data)
{
struct MHD_Connection *con = data;
struct MHD_Daemon *daemon = con->daemon;
int num_ready;
fd_set rs;
fd_set ws;
MHD_socket maxsock;
struct timeval tv;
struct timeval *tvp;
time_t now;
#if WINDOWS
#ifdef HAVE_POLL
int extra_slot;
#endif /* HAVE_POLL */
#define EXTRA_SLOTS 1
#else /* !WINDOWS */
#define EXTRA_SLOTS 0
#endif /* !WINDOWS */
#ifdef HAVE_POLL
struct pollfd p[1 + EXTRA_SLOTS];
#endif
#undef EXTRA_SLOTS
while ( (MHD_YES != daemon->shutdown) &&
(MHD_CONNECTION_CLOSED != con->state) )
{
const unsigned int timeout = daemon->connection_timeout;
tvp = NULL;
#if HTTPS_SUPPORT
if (MHD_YES == con->tls_read_ready)
{
/* do not block (more data may be inside of TLS buffers waiting for us) */
tv.tv_sec = 0;
tv.tv_usec = 0;
tvp = &tv;
}
#endif
if ( (NULL == tvp) &&
(timeout > 0) )
{
now = MHD_monotonic_sec_counter();
if (now - con->last_activity > timeout)
tv.tv_sec = 0;
else
{
const time_t seconds_left = timeout - (now - con->last_activity);
#ifndef _WIN32
tv.tv_sec = seconds_left;
#else /* _WIN32 */
if (seconds_left > TIMEVAL_TV_SEC_MAX)
tv.tv_sec = TIMEVAL_TV_SEC_MAX;
else
tv.tv_sec = (_MHD_TIMEVAL_TV_SEC_TYPE) seconds_left;
#endif /* _WIN32 */
}
tv.tv_usec = 0;
tvp = &tv;
}
if (0 == (daemon->options & MHD_USE_POLL))
{
/* use select */
int err_state = 0;
FD_ZERO (&rs);
FD_ZERO (&ws);
maxsock = MHD_INVALID_SOCKET;
switch (con->event_loop_info)
{
case MHD_EVENT_LOOP_INFO_READ:
if (! MHD_add_to_fd_set_ (con->socket_fd,
&rs,
&maxsock,
FD_SETSIZE))
err_state = 1;
break;
case MHD_EVENT_LOOP_INFO_WRITE:
if (! MHD_add_to_fd_set_ (con->socket_fd,
&ws,
&maxsock,
FD_SETSIZE))
err_state = 1;
if ( (con->read_buffer_size > con->read_buffer_offset) &&
(! MHD_add_to_fd_set_ (con->socket_fd,
&rs,
&maxsock,
FD_SETSIZE)) )
err_state = 1;
break;
case MHD_EVENT_LOOP_INFO_BLOCK:
if ( (con->read_buffer_size > con->read_buffer_offset) &&
(! MHD_add_to_fd_set_ (con->socket_fd,
&rs,
&maxsock,
FD_SETSIZE)) )
err_state = 1;
tv.tv_sec = 0;
tv.tv_usec = 0;
tvp = &tv;
break;
case MHD_EVENT_LOOP_INFO_CLEANUP:
/* how did we get here!? */
goto exit;
}
#if WINDOWS
if (MHD_ITC_IS_VALID_(daemon->itc) )
{
if (! MHD_add_to_fd_set_ (MHD_itc_r_fd_ (daemon->itc),
&rs,
&maxsock,
FD_SETSIZE))
err_state = 1;
}
#endif
if (0 != err_state)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Failed to add FD to fd_set\n"));
#endif
goto exit;
}
num_ready = MHD_SYS_select_ (maxsock + 1,
&rs,
&ws,
NULL,
tvp);
if (num_ready < 0)
{
const int err = MHD_socket_get_error_();
if (MHD_SCKT_ERR_IS_EINTR_(err))
continue;
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Error during select (%d): `%s'\n"),
err,
MHD_socket_strerr_ (err));
#endif
break;
}
#if WINDOWS
/* Clear ITC before other processing so additional
* signals will trigger select() again */
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(FD_ISSET (MHD_itc_r_fd_ (daemon->itc),
&rs)) )
MHD_itc_clear_ (daemon->itc);
#endif
if (MHD_NO ==
call_handlers (con,
FD_ISSET (con->socket_fd,
&rs),
FD_ISSET (con->socket_fd,
&ws),
MHD_NO))
goto exit;
}
#ifdef HAVE_POLL
else
{
/* use poll */
memset (&p,
0,
sizeof (p));
p[0].fd = con->socket_fd;
switch (con->event_loop_info)
{
case MHD_EVENT_LOOP_INFO_READ:
p[0].events |= POLLIN;
break;
case MHD_EVENT_LOOP_INFO_WRITE:
p[0].events |= POLLOUT;
if (con->read_buffer_size > con->read_buffer_offset)
p[0].events |= POLLIN;
break;
case MHD_EVENT_LOOP_INFO_BLOCK:
if (con->read_buffer_size > con->read_buffer_offset)
p[0].events |= POLLIN;
tv.tv_sec = 0;
tv.tv_usec = 0;
tvp = &tv;
break;
case MHD_EVENT_LOOP_INFO_CLEANUP:
/* how did we get here!? */
goto exit;
}
#if WINDOWS
extra_slot = 0;
if (MHD_ITC_IS_VALID_(daemon->itc))
{
p[1].events |= POLLIN;
p[1].fd = MHD_itc_r_fd_ (daemon->itc);
p[1].revents = 0;
extra_slot = 1;
}
#endif
if (MHD_sys_poll_ (p,
#if WINDOWS
1 + extra_slot,
#else
1,
#endif
(NULL == tvp) ? -1 : tv.tv_sec * 1000) < 0)
{
if (MHD_SCKT_LAST_ERR_IS_(MHD_SCKT_EINTR_))
continue;
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Error during poll: `%s'\n"),
MHD_socket_last_strerr_ ());
#endif
break;
}
#if WINDOWS
/* Clear ITC before other processing so additional
* signals will trigger poll() again */
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(0 != (p[1].revents & (POLLERR | POLLHUP | POLLIN))) )
MHD_itc_clear_ (daemon->itc);
#endif
if (MHD_NO ==
call_handlers (con,
0 != (p[0].revents & POLLIN),
0 != (p[0].revents & POLLOUT),
0 != (p[0].revents & (POLLERR | POLLHUP))))
goto exit;
}
#endif
if (MHD_CONNECTION_UPGRADE == con->state)
{
thread_main_connection_upgrade (con);
#if HTTPS_SUPPORT
if (0 != (daemon->options & MHD_USE_TLS) )
break;
#endif
/* skip usual clean up EXCEPT for the completion
notification (which must be done in this thread)! */
if ( (NULL != daemon->notify_completed) &&
(MHD_YES == con->client_aware) )
daemon->notify_completed (daemon->notify_completed_cls,
con,
&con->client_context,
MHD_REQUEST_TERMINATED_COMPLETED_OK);
con->client_aware = MHD_NO;
return (MHD_THRD_RTRN_TYPE_) 0;
}
}
if (MHD_CONNECTION_IN_CLEANUP != con->state)
{
#if DEBUG_CLOSE
#ifdef HAVE_MESSAGES
MHD_DLOG (con->daemon,
_("Processing thread terminating. Closing connection\n"));
#endif
#endif
if (MHD_CONNECTION_CLOSED != con->state)
MHD_connection_close_ (con,
MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN);
con->idle_handler (con);
}
exit:
if (NULL != con->response)
{
MHD_destroy_response (con->response);
con->response = NULL;
}
if (MHD_INVALID_SOCKET != con->socket_fd)
{
shutdown (con->socket_fd,
SHUT_WR);
MHD_socket_close_chk_ (con->socket_fd);
con->socket_fd = MHD_INVALID_SOCKET;
}
return (MHD_THRD_RTRN_TYPE_) 0;
}
/**
* Callback for receiving data from the socket.
*
* @param connection the MHD connection structure
* @param other where to write received data to
* @param i maximum size of other (in bytes)
* @return number of bytes actually received
*/
static ssize_t
recv_param_adapter (struct MHD_Connection *connection,
void *other,
size_t i)
{
ssize_t ret;
if ( (MHD_INVALID_SOCKET == connection->socket_fd) ||
(MHD_CONNECTION_CLOSED == connection->state) )
{
MHD_socket_set_error_ (MHD_SCKT_ENOTCONN_);
return -1;
}
if (i > MHD_SCKT_SEND_MAX_SIZE_)
i = MHD_SCKT_SEND_MAX_SIZE_; /* return value limit */
ret = MHD_recv_ (connection->socket_fd,
other,
i);
#ifdef EPOLL_SUPPORT
if ( (0 > ret) &&
(MHD_SCKT_ERR_IS_EAGAIN_ (MHD_socket_get_error_ ())) )
{
/* Got EAGAIN --- no longer read-ready */
connection->epoll_state &= ~MHD_EPOLL_STATE_READ_READY;
}
#endif
return ret;
}
/**
* Callback for writing data to the socket.
*
* @param connection the MHD connection structure
* @param other data to write
* @param i number of bytes to write
* @return actual number of bytes written
*/
static ssize_t
send_param_adapter (struct MHD_Connection *connection,
const void *other,
size_t i)
{
ssize_t ret;
int err;
#if LINUX
MHD_socket fd;
#endif
if ( (MHD_INVALID_SOCKET == connection->socket_fd) ||
(MHD_CONNECTION_CLOSED == connection->state) )
{
MHD_socket_set_error_ (MHD_SCKT_ENOTCONN_);
return -1;
}
if (i > MHD_SCKT_SEND_MAX_SIZE_)
i = MHD_SCKT_SEND_MAX_SIZE_; /* return value limit */
if (0 != (connection->daemon->options & MHD_USE_TLS))
return MHD_send_ (connection->socket_fd,
other,
i);
#if LINUX
if ( (connection->write_buffer_append_offset ==
connection->write_buffer_send_offset) &&
(NULL != connection->response) &&
(-1 != (fd = connection->response->fd)) )
{
/* can use sendfile */
uint64_t left;
uint64_t offsetu64;
#ifndef HAVE_SENDFILE64
off_t offset;
#else /* HAVE_SENDFILE64 */
off64_t offset;
#endif /* HAVE_SENDFILE64 */
offsetu64 = connection->response_write_position + connection->response->fd_off;
left = connection->response->total_size - connection->response_write_position;
ret = 0;
MHD_socket_set_error_to_ENOMEM ();
#ifndef HAVE_SENDFILE64
offset = (off_t) offsetu64;
if ( (offsetu64 <= (uint64_t) OFF_T_MAX) &&
(0 < (ret = sendfile (connection->socket_fd,
fd,
&offset,
left))) )
#else /* HAVE_SENDFILE64 */
offset = (off64_t) offsetu64;
if ( (offsetu64 <= (uint64_t) OFF64_T_MAX) &&
(0 < (ret = sendfile64 (connection->socket_fd,
fd,
&offset,
left))) )
#endif /* HAVE_SENDFILE64 */
{
/* write successful */
return ret;
}
err = MHD_socket_get_error_();
#ifdef EPOLL_SUPPORT
if ( (0 > ret) && (MHD_SCKT_ERR_IS_EAGAIN_(err)) )
{
/* EAGAIN --- no longer write-ready */
connection->epoll_state &= ~MHD_EPOLL_STATE_WRITE_READY;
}
#endif
if (MHD_SCKT_ERR_IS_EINTR_ (err) ||
MHD_SCKT_ERR_IS_EAGAIN_ (err))
return 0;
if (MHD_SCKT_ERR_IS_(err,
MHD_SCKT_EBADF_))
return -1;
/* sendfile() failed with EINVAL if mmap()-like operations are not
supported for FD or other 'unusual' errors occurred, so we should try
to fall back to 'SEND'; see also this thread for info on
odd libc/Linux behavior with sendfile:
http://lists.gnu.org/archive/html/libmicrohttpd/2011-02/msg00015.html */
}
#endif
ret = MHD_send_ (connection->socket_fd,
other,
i);
err = MHD_socket_get_error_();
#ifdef EPOLL_SUPPORT
if ( (0 > ret) &&
(MHD_SCKT_ERR_IS_EAGAIN_(err)) )
{
/* EAGAIN --- no longer write-ready */
connection->epoll_state &= ~MHD_EPOLL_STATE_WRITE_READY;
}
#endif
/* Handle broken kernel / libc, returning -1 but not setting errno;
kill connection as that should be safe; reported on mailinglist here:
http://lists.gnu.org/archive/html/libmicrohttpd/2014-10/msg00023.html */
if ( (0 > ret) &&
(0 == err) )
MHD_socket_set_error_ (MHD_SCKT_ECONNRESET_);
return ret;
}
/**
* Free resources associated with all closed connections.
* (destroy responses, free buffers, etc.). All closed
* connections are kept in the "cleanup" doubly-linked list.
*
* @param daemon daemon to clean up
*/
static void
MHD_cleanup_connections (struct MHD_Daemon *daemon);
/**
* Add another client connection to the set of connections
* managed by MHD. This API is usually not needed (since
* MHD will accept inbound connections on the server socket).
* Use this API in special cases, for example if your HTTP
* server is behind NAT and needs to connect out to the
* HTTP client.
*
* The given client socket will be managed (and closed!) by MHD after
* this call and must no longer be used directly by the application
* afterwards.
*
* Per-IP connection limits are ignored when using this API.
*
* @param daemon daemon that manages the connection
* @param client_socket socket to manage (MHD will expect
* to receive an HTTP request from this socket next).
* @param addr IP address of the client
* @param addrlen number of bytes in @a addr
* @param external_add perform additional operations needed due
* to the application calling us directly
* @return #MHD_YES on success, #MHD_NO if this daemon could
* not handle the connection (i.e. malloc failed, etc).
* The socket will be closed in any case; 'errno' is
* set to indicate further details about the error.
*/
static int
internal_add_connection (struct MHD_Daemon *daemon,
MHD_socket client_socket,
const struct sockaddr *addr,
socklen_t addrlen,
int external_add)
{
struct MHD_Connection *connection;
unsigned int i;
int eno;
struct MHD_Daemon *worker;
if (NULL != daemon->worker_pool)
{
/* have a pool, try to find a pool with capacity; we use the
socket as the initial offset into the pool for load
balancing */
for (i=0;i<daemon->worker_pool_size;i++)
{
worker = &daemon->worker_pool[(i + client_socket) % daemon->worker_pool_size];
if (worker->connections < worker->connection_limit)
return internal_add_connection (worker,
client_socket,
addr,
addrlen,
external_add);
}
/* all pools are at their connection limit, must refuse */
MHD_socket_close_chk_ (client_socket);
#if ENFILE
errno = ENFILE;
#endif
return MHD_NO;
}
if ( (! MHD_SCKT_FD_FITS_FDSET_(client_socket,
NULL)) &&
(0 == (daemon->options & (MHD_USE_POLL | MHD_USE_EPOLL))) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Socket descriptor larger than FD_SETSIZE: %d > %d\n"),
(int) client_socket,
(int) FD_SETSIZE);
#endif
MHD_socket_close_chk_ (client_socket);
#if EINVAL
errno = EINVAL;
#endif
return MHD_NO;
}
#ifdef MHD_socket_nosignal_
if (! MHD_socket_nosignal_ (client_socket))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set SO_NOSIGPIPE on accepted socket: %s\n"),
MHD_socket_last_strerr_());
#endif
#ifndef MSG_NOSIGNAL
/* Cannot use socket as it can produce SIGPIPE. */
#ifdef ENOTSOCK
errno = ENOTSOCK;
#endif /* ENOTSOCK */
return MHD_NO;
#endif /* ! MSG_NOSIGNAL */
}
#endif /* MHD_socket_nosignal_ */
#ifdef HAVE_MESSAGES
#if DEBUG_CONNECT
MHD_DLOG (daemon,
_("Accepted connection on socket %d\n"),
client_socket);
#endif
#endif
if ( (daemon->connections == daemon->connection_limit) ||
(MHD_NO == MHD_ip_limit_add (daemon,
addr,
addrlen)) )
{
/* above connection limit - reject */
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Server reached connection limit. Closing inbound connection.\n"));
#endif
MHD_socket_close_chk_ (client_socket);
#if ENFILE
errno = ENFILE;
#endif
return MHD_NO;
}
/* apply connection acceptance policy if present */
if ( (NULL != daemon->apc) &&
(MHD_NO == daemon->apc (daemon->apc_cls,
addr,
addrlen)) )
{
#if DEBUG_CLOSE
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Connection rejected by application. Closing connection.\n"));
#endif
#endif
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
#if EACCESS
errno = EACCESS;
#endif
return MHD_NO;
}
if (NULL == (connection = malloc (sizeof (struct MHD_Connection))))
{
eno = errno;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
"Error allocating memory: %s\n",
MHD_strerror_ (errno));
#endif
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
errno = eno;
return MHD_NO;
}
memset (connection,
0,
sizeof (struct MHD_Connection));
connection->pool = MHD_pool_create (daemon->pool_size);
if (NULL == connection->pool)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Error allocating memory: %s\n"),
MHD_strerror_ (errno));
#endif
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
free (connection);
#if ENOMEM
errno = ENOMEM;
#endif
return MHD_NO;
}
connection->connection_timeout = daemon->connection_timeout;
if (NULL == (connection->addr = malloc (addrlen)))
{
eno = errno;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Error allocating memory: %s\n"),
MHD_strerror_ (errno));
#endif
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
MHD_pool_destroy (connection->pool);
free (connection);
errno = eno;
return MHD_NO;
}
memcpy (connection->addr,
addr,
addrlen);
connection->addr_len = addrlen;
connection->socket_fd = client_socket;
connection->daemon = daemon;
connection->last_activity = MHD_monotonic_sec_counter();
/* set default connection handlers */
MHD_set_http_callbacks_ (connection);
connection->recv_cls = &recv_param_adapter;
connection->send_cls = &send_param_adapter;
if (0 == (connection->daemon->options & MHD_USE_EPOLL_TURBO))
{
/* in turbo mode, we assume that non-blocking was already set
by 'accept4' or whoever calls 'MHD_add_connection' */
if (! MHD_socket_nonblocking_ (connection->socket_fd))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_("Failed to set nonblocking mode on connection socket: %s\n"),
MHD_socket_last_strerr_());
#endif
}
}
#if HTTPS_SUPPORT
if (0 != (daemon->options & MHD_USE_TLS))
{
connection->recv_cls = &recv_tls_adapter;
connection->send_cls = &send_tls_adapter;
connection->state = MHD_TLS_CONNECTION_INIT;
MHD_set_https_callbacks (connection);
gnutls_init (&connection->tls_session,
GNUTLS_SERVER);
gnutls_priority_set (connection->tls_session,
daemon->priority_cache);
switch (daemon->cred_type)
{
/* set needed credentials for certificate authentication. */
case GNUTLS_CRD_CERTIFICATE:
gnutls_credentials_set (connection->tls_session,
GNUTLS_CRD_CERTIFICATE,
daemon->x509_cred);
break;
default:
#ifdef HAVE_MESSAGES
MHD_DLOG (connection->daemon,
_("Failed to setup TLS credentials: unknown credential type %d\n"),
daemon->cred_type);
#endif
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
free (connection->addr);
free (connection);
MHD_PANIC (_("Unknown credential type"));
#if EINVAL
errno = EINVAL;
#endif
return MHD_NO;
}
gnutls_transport_set_ptr (connection->tls_session,
(gnutls_transport_ptr_t) connection);
gnutls_transport_set_pull_function (connection->tls_session,
(gnutls_pull_func) &recv_param_adapter);
gnutls_transport_set_push_function (connection->tls_session,
(gnutls_push_func) &send_param_adapter);
if (daemon->https_mem_trust)
gnutls_certificate_server_set_request (connection->tls_session,
GNUTLS_CERT_REQUEST);
}
#endif
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
}
else
{
XDLL_insert (daemon->normal_timeout_head,
daemon->normal_timeout_tail,
connection);
}
DLL_insert (daemon->connections_head,
daemon->connections_tail,
connection);
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
if (NULL != daemon->notify_connection)
daemon->notify_connection (daemon->notify_connection_cls,
connection,
&connection->socket_context,
MHD_CONNECTION_NOTIFY_STARTED);
/* attempt to create handler thread */
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
if (! MHD_create_named_thread_ (&connection->pid,
"MHD-connection",
daemon->thread_stack_size,
&thread_main_handle_connection,
connection))
{
eno = errno;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
"Failed to create a thread: %s\n",
MHD_strerror_ (eno));
#endif
goto cleanup;
}
}
else
if ( (MHD_YES == external_add) &&
(MHD_ITC_IS_VALID_(daemon->itc)) &&
(! MHD_itc_activate_ (daemon->itc, "n")) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to signal new connection via inter-thread communication channel."));
#endif
}
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
if (0 == (daemon->options & MHD_USE_EPOLL_TURBO))
{
struct epoll_event event;
event.events = EPOLLIN | EPOLLOUT | EPOLLET;
event.data.ptr = connection;
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
client_socket,
&event))
{
eno = errno;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_ctl failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
goto cleanup;
}
connection->epoll_state |= MHD_EPOLL_STATE_IN_EPOLL_SET;
}
else
{
connection->epoll_state |= MHD_EPOLL_STATE_READ_READY | MHD_EPOLL_STATE_WRITE_READY
| MHD_EPOLL_STATE_IN_EREADY_EDLL;
EDLL_insert (daemon->eready_head,
daemon->eready_tail,
connection);
}
}
#endif
daemon->connections++;
return MHD_YES;
cleanup:
if (NULL != daemon->notify_connection)
daemon->notify_connection (daemon->notify_connection_cls,
connection,
&connection->socket_context,
MHD_CONNECTION_NOTIFY_CLOSED);
MHD_socket_close_chk_ (client_socket);
MHD_ip_limit_del (daemon,
addr,
addrlen);
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
}
else
{
XDLL_remove (daemon->normal_timeout_head,
daemon->normal_timeout_tail,
connection);
}
DLL_remove (daemon->connections_head,
daemon->connections_tail,
connection);
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
MHD_pool_destroy (connection->pool);
free (connection->addr);
free (connection);
errno = eno;
return MHD_NO;
}
/**
* Suspend handling of network data for a given connection. This can
* be used to dequeue a connection from MHD's event loop (external
* select, internal select or thread pool; not applicable to
* thread-per-connection!) for a while.
*
* If you use this API in conjunction with a internal select or a
* thread pool, you must set the option #MHD_USE_ITC to
* ensure that a resumed connection is immediately processed by MHD.
*
* Suspended connections continue to count against the total number of
* connections allowed (per daemon, as well as per IP, if such limits
* are set). Suspended connections will NOT time out; timeouts will
* restart when the connection handling is resumed. While a
* connection is suspended, MHD will not detect disconnects by the
* client.
*
* The only safe time to suspend a connection is from the
* #MHD_AccessHandlerCallback.
*
* Finally, it is an API violation to call #MHD_stop_daemon while
* having suspended connections (this will at least create memory and
* socket leaks or lead to undefined behavior). You must explicitly
* resume all connections before stopping the daemon.
*
* @param connection the connection to suspend
*/
void
MHD_suspend_connection (struct MHD_Connection *connection)
{
struct MHD_Daemon *daemon;
daemon = connection->daemon;
if (MHD_USE_SUSPEND_RESUME != (daemon->options & MHD_USE_SUSPEND_RESUME))
MHD_PANIC (_("Cannot suspend connections without enabling MHD_USE_SUSPEND_RESUME!\n"));
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
}
else
{
if (connection->connection_timeout == daemon->connection_timeout)
XDLL_remove (daemon->normal_timeout_head,
daemon->normal_timeout_tail,
connection);
else
XDLL_remove (daemon->manual_timeout_head,
daemon->manual_timeout_tail,
connection);
}
DLL_remove (daemon->connections_head,
daemon->connections_tail,
connection);
DLL_insert (daemon->suspended_connections_head,
daemon->suspended_connections_tail,
connection);
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
if (0 != (connection->epoll_state & MHD_EPOLL_STATE_IN_EREADY_EDLL))
{
EDLL_remove (daemon->eready_head,
daemon->eready_tail,
connection);
connection->epoll_state &= ~MHD_EPOLL_STATE_IN_EREADY_EDLL;
}
if (0 != (connection->epoll_state & MHD_EPOLL_STATE_IN_EPOLL_SET))
{
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_DEL,
connection->socket_fd,
NULL))
MHD_PANIC (_("Failed to remove FD from epoll set\n"));
connection->epoll_state &= ~MHD_EPOLL_STATE_IN_EPOLL_SET;
}
connection->epoll_state |= MHD_EPOLL_STATE_SUSPENDED;
}
#endif
connection->suspended = MHD_YES;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
}
/**
* Resume handling of network data for suspended connection. It is
* safe to resume a suspended connection at any time. Calling this function
* on a connection that was not previously suspended will result
* in undefined behavior.
*
* @param connection the connection to resume
*/
void
MHD_resume_connection (struct MHD_Connection *connection)
{
struct MHD_Daemon *daemon;
daemon = connection->daemon;
if (MHD_USE_SUSPEND_RESUME != (daemon->options & MHD_USE_SUSPEND_RESUME))
MHD_PANIC (_("Cannot resume connections without enabling MHD_USE_SUSPEND_RESUME!\n"));
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
connection->resuming = MHD_YES;
daemon->resuming = MHD_YES;
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(! MHD_itc_activate_ (daemon->itc, "r")) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to signal resume via inter-thread communication channel."));
#endif
}
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
}
/**
* Run through the suspended connections and move any that are no
* longer suspended back to the active state.
*
* @param daemon daemon context
* @return #MHD_YES if a connection was actually resumed
*/
static int
resume_suspended_connections (struct MHD_Daemon *daemon)
{
struct MHD_Connection *pos;
struct MHD_Connection *next = NULL;
int ret;
ret = MHD_NO;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
if (MHD_NO != daemon->resuming)
next = daemon->suspended_connections_head;
/* Clear the flag *only* if connections will be resumed otherwise
it may accidentally clear flag that was set at the same time in
other thread (just after 'if (MHD_NO != daemon->resuming)' in
this thread).
Clear flag *before* resuming connections otherwise new connection can
be set to "resuming" in other thread, but missed resuming in this
function at this time so clearing flag at end will clear it without
actually resuming of new connection. */
if (NULL != next)
daemon->resuming = MHD_NO;
while (NULL != (pos = next))
{
next = pos->next;
if (MHD_NO == pos->resuming)
continue;
ret = MHD_YES;
DLL_remove (daemon->suspended_connections_head,
daemon->suspended_connections_tail,
pos);
DLL_insert (daemon->connections_head,
daemon->connections_tail,
pos);
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
if (pos->connection_timeout == daemon->connection_timeout)
XDLL_insert (daemon->normal_timeout_head,
daemon->normal_timeout_tail,
pos);
else
XDLL_insert (daemon->manual_timeout_head,
daemon->manual_timeout_tail,
pos);
}
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
if (0 != (pos->epoll_state & MHD_EPOLL_STATE_IN_EREADY_EDLL))
MHD_PANIC ("Resumed connection was already in EREADY set\n");
/* we always mark resumed connections as ready, as we
might have missed the edge poll event during suspension */
EDLL_insert (daemon->eready_head,
daemon->eready_tail,
pos);
pos->epoll_state |= MHD_EPOLL_STATE_IN_EREADY_EDLL;
pos->epoll_state &= ~MHD_EPOLL_STATE_SUSPENDED;
}
#endif
pos->suspended = MHD_NO;
pos->resuming = MHD_NO;
}
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
return ret;
}
/**
* Add another client connection to the set of connections managed by
* MHD. This API is usually not needed (since MHD will accept inbound
* connections on the server socket). Use this API in special cases,
* for example if your HTTP server is behind NAT and needs to connect
* out to the HTTP client, or if you are building a proxy.
*
* If you use this API in conjunction with a internal select or a
* thread pool, you must set the option
* #MHD_USE_ITC to ensure that the freshly added
* connection is immediately processed by MHD.
*
* The given client socket will be managed (and closed!) by MHD after
* this call and must no longer be used directly by the application
* afterwards.
*
* Per-IP connection limits are ignored when using this API.
*
* @param daemon daemon that manages the connection
* @param client_socket socket to manage (MHD will expect
* to receive an HTTP request from this socket next).
* @param addr IP address of the client
* @param addrlen number of bytes in @a addr
* @return #MHD_YES on success, #MHD_NO if this daemon could
* not handle the connection (i.e. malloc() failed, etc).
* The socket will be closed in any case; `errno` is
* set to indicate further details about the error.
* @ingroup specialized
*/
int
MHD_add_connection (struct MHD_Daemon *daemon,
MHD_socket client_socket,
const struct sockaddr *addr,
socklen_t addrlen)
{
/* internal_add_connection() assume that non-blocking is
already set in MHD_USE_EPOLL_TURBO mode */
if (0 != (daemon->options & MHD_USE_EPOLL_TURBO))
{
if (! MHD_socket_nonblocking_ (client_socket))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set nonblocking mode on new client socket: %s\n"),
MHD_socket_last_strerr_());
#endif
}
if (! MHD_socket_noninheritable_ (client_socket))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set noninheritable mode on new client socket.\n"));
#endif
}
}
return internal_add_connection (daemon,
client_socket,
addr,
addrlen,
MHD_YES);
}
/**
* Accept an incoming connection and create the MHD_Connection object for
* it. This function also enforces policy by way of checking with the
* accept policy callback.
*
* @param daemon handle with the listen socket
* @return #MHD_YES on success (connections denied by policy or due
* to 'out of memory' and similar errors) are still considered
* successful as far as #MHD_accept_connection() is concerned);
* a return code of #MHD_NO only refers to the actual
* accept() system call.
*/
static int
MHD_accept_connection (struct MHD_Daemon *daemon)
{
#if HAVE_INET6
struct sockaddr_in6 addrstorage;
#else
struct sockaddr_in addrstorage;
#endif
struct sockaddr *addr = (struct sockaddr *) &addrstorage;
socklen_t addrlen;
MHD_socket s;
MHD_socket fd;
addrlen = sizeof (addrstorage);
memset (addr,
0,
sizeof (addrstorage));
if (MHD_INVALID_SOCKET == (fd = daemon->socket_fd))
return MHD_NO;
#ifdef USE_ACCEPT4
s = accept4 (fd,
addr,
&addrlen,
MAYBE_SOCK_CLOEXEC | MAYBE_SOCK_NONBLOCK);
#else /* ! USE_ACCEPT4 */
s = accept (fd,
addr,
&addrlen);
#endif /* ! USE_ACCEPT4 */
if ( (MHD_INVALID_SOCKET == s) ||
(addrlen <= 0) )
{
const int err = MHD_socket_get_error_ ();
/* This could be a common occurance with multiple worker threads */
if ( (MHD_SCKT_ERR_IS_ (err,
MHD_SCKT_EINVAL_)) &&
(MHD_INVALID_SOCKET == daemon->socket_fd) )
return MHD_NO; /* can happen during shutdown */
if (MHD_SCKT_ERR_IS_DISCNN_BEFORE_ACCEPT_(err))
return MHD_NO; /* do not print error if client just disconnected early */
#ifdef HAVE_MESSAGES
if (! MHD_SCKT_ERR_IS_EAGAIN_ (err) )
MHD_DLOG (daemon,
_("Error accepting connection: %s\n"),
MHD_socket_strerr_(err));
#endif
if (MHD_INVALID_SOCKET != s)
{
MHD_socket_close_chk_ (s);
}
if ( MHD_SCKT_ERR_IS_LOW_RESOURCES_ (err) )
{
/* system/process out of resources */
if (0 == daemon->connections)
{
#ifdef HAVE_MESSAGES
/* Not setting 'at_limit' flag, as there is no way it
would ever be cleared. Instead trying to produce
bit fat ugly warning. */
MHD_DLOG (daemon,
_("Hit process or system resource limit at FIRST connection. This is really bad as there is no sane way to proceed. Will try busy waiting for system resources to become magically available.\n"));
#endif
}
else
{
daemon->at_limit = MHD_YES;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Hit process or system resource limit at %u connections, temporarily suspending accept(). Consider setting a lower MHD_OPTION_CONNECTION_LIMIT.\n"),
(unsigned int) daemon->connections);
#endif
}
}
return MHD_NO;
}
#if !defined(USE_ACCEPT4) || !defined(HAVE_SOCK_NONBLOCK)
if (! MHD_socket_nonblocking_ (s))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set nonblocking mode on incoming connection socket: %s\n"),
MHD_socket_last_strerr_());
#endif
}
#endif /* !USE_ACCEPT4 || !HAVE_SOCK_NONBLOCK */
#if !defined(USE_ACCEPT4) || !defined(SOCK_CLOEXEC)
if (! MHD_socket_noninheritable_ (s))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set noninheritable mode on incoming connection socket.\n"));
#endif
}
#endif /* !USE_ACCEPT4 || !SOCK_CLOEXEC */
#ifdef HAVE_MESSAGES
#if DEBUG_CONNECT
MHD_DLOG (daemon,
_("Accepted connection on socket %d\n"),
s);
#endif
#endif
(void) internal_add_connection (daemon,
s,
addr,
addrlen,
MHD_NO);
return MHD_YES;
}
/**
* Free resources associated with all closed connections.
* (destroy responses, free buffers, etc.). All closed
* connections are kept in the "cleanup" doubly-linked list.
*
* @param daemon daemon to clean up
*/
static void
MHD_cleanup_connections (struct MHD_Daemon *daemon)
{
struct MHD_Connection *pos;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
while (NULL != (pos = daemon->cleanup_head))
{
DLL_remove (daemon->cleanup_head,
daemon->cleanup_tail,
pos);
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
if ( (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) &&
(MHD_NO == pos->thread_joined) &&
(! MHD_join_thread_ (pos->pid)) )
MHD_PANIC (_("Failed to join a thread\n"));
MHD_pool_destroy (pos->pool);
#if HTTPS_SUPPORT
if (NULL != pos->tls_session)
gnutls_deinit (pos->tls_session);
#endif
daemon->connections--;
daemon->at_limit = MHD_NO;
/* clean up the connection */
if (NULL != daemon->notify_connection)
daemon->notify_connection (daemon->notify_connection_cls,
pos,
&pos->socket_context,
MHD_CONNECTION_NOTIFY_CLOSED);
MHD_ip_limit_del (daemon,
pos->addr,
pos->addr_len);
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
if (0 != (pos->epoll_state & MHD_EPOLL_STATE_IN_EREADY_EDLL))
{
EDLL_remove (daemon->eready_head,
daemon->eready_tail,
pos);
pos->epoll_state &= ~MHD_EPOLL_STATE_IN_EREADY_EDLL;
}
if ( (-1 != daemon->epoll_fd) &&
(0 != (pos->epoll_state & MHD_EPOLL_STATE_IN_EPOLL_SET)) )
{
/* epoll documentation suggests that closing a FD
automatically removes it from the epoll set; however,
this is not true as if we fail to do manually remove it,
we are still seeing an event for this fd in epoll,
causing grief (use-after-free...) --- at least on my
system. */
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_DEL,
pos->socket_fd,
NULL))
MHD_PANIC (_("Failed to remove FD from epoll set\n"));
pos->epoll_state &= ~MHD_EPOLL_STATE_IN_EPOLL_SET;
}
}
#endif
if (NULL != pos->response)
{
MHD_destroy_response (pos->response);
pos->response = NULL;
}
if (MHD_INVALID_SOCKET != pos->socket_fd)
MHD_socket_close_chk_ (pos->socket_fd);
if (NULL != pos->addr)
free (pos->addr);
free (pos);
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
}
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
}
/**
* Obtain timeout value for `select()` for this daemon (only needed if
* connection timeout is used). The returned value is how long
* `select()` or `poll()` should at most block, not the timeout value set
* for connections. This function MUST NOT be called if MHD is
* running with #MHD_USE_THREAD_PER_CONNECTION.
*
* @param daemon daemon to query for timeout
* @param timeout set to the timeout (in milliseconds)
* @return #MHD_YES on success, #MHD_NO if timeouts are
* not used (or no connections exist that would
* necessitate the use of a timeout right now).
* @ingroup event
*/
int
MHD_get_timeout (struct MHD_Daemon *daemon,
MHD_UNSIGNED_LONG_LONG *timeout)
{
time_t earliest_deadline;
time_t now;
struct MHD_Connection *pos;
int have_timeout;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Illegal call to MHD_get_timeout\n"));
#endif
return MHD_NO;
}
#if HTTPS_SUPPORT
if (0 != daemon->num_tls_read_ready)
{
/* if there is any TLS connection with data ready for
reading, we must not block in the event loop */
*timeout = 0;
return MHD_YES;
}
#endif
have_timeout = MHD_NO;
earliest_deadline = 0; /* avoid compiler warnings */
for (pos = daemon->manual_timeout_head; NULL != pos; pos = pos->nextX)
{
if (0 != pos->connection_timeout)
{
if ( (! have_timeout) ||
(earliest_deadline > pos->last_activity + pos->connection_timeout) )
earliest_deadline = pos->last_activity + pos->connection_timeout;
#if HTTPS_SUPPORT
if ( (0 != (daemon->options & MHD_USE_TLS)) &&
(0 != gnutls_record_check_pending (pos->tls_session)) )
earliest_deadline = 0;
#endif
have_timeout = MHD_YES;
}
}
/* normal timeouts are sorted, so we only need to look at the 'head' */
pos = daemon->normal_timeout_head;
if ( (NULL != pos) &&
(0 != pos->connection_timeout) )
{
if ( (! have_timeout) ||
(earliest_deadline > pos->last_activity + pos->connection_timeout) )
earliest_deadline = pos->last_activity + pos->connection_timeout;
#if HTTPS_SUPPORT
if ( (0 != (daemon->options & MHD_USE_TLS)) &&
(0 != gnutls_record_check_pending (pos->tls_session)) )
earliest_deadline = 0;
#endif
have_timeout = MHD_YES;
}
if (MHD_NO == have_timeout)
return MHD_NO;
now = MHD_monotonic_sec_counter();
if (earliest_deadline < now)
*timeout = 0;
else
{
const time_t second_left = earliest_deadline - now;
if (second_left > ULLONG_MAX / 1000)
*timeout = ULLONG_MAX;
else
*timeout = 1000 * second_left;
}
return MHD_YES;
}
/**
* Run webserver operations. This method should be called by clients
* in combination with #MHD_get_fdset if the client-controlled select
* method is used.
*
* You can use this function instead of #MHD_run if you called
* `select()` on the result from #MHD_get_fdset. File descriptors in
* the sets that are not controlled by MHD will be ignored. Calling
* this function instead of #MHD_run is more efficient as MHD will
* not have to call `select()` again to determine which operations are
* ready.
*
* @param daemon daemon to run select loop for
* @param read_fd_set read set
* @param write_fd_set write set
* @param except_fd_set except set (not used, can be NULL)
* @return #MHD_NO on serious errors, #MHD_YES on success
* @ingroup event
*/
int
MHD_run_from_select (struct MHD_Daemon *daemon,
const fd_set *read_fd_set,
const fd_set *write_fd_set,
const fd_set *except_fd_set)
{
MHD_socket ds;
struct MHD_Connection *pos;
struct MHD_Connection *next;
#if HTTPS_SUPPORT
struct MHD_UpgradeResponseHandle *urh;
struct MHD_UpgradeResponseHandle *urhn;
#endif
unsigned int mask = MHD_USE_SUSPEND_RESUME | MHD_USE_EPOLL_INTERNALLY |
MHD_USE_SELECT_INTERNALLY | MHD_USE_POLL_INTERNALLY | MHD_USE_THREAD_PER_CONNECTION;
/* Clear ITC to avoid spinning select */
/* Do it before any other processing so new signals
will trigger select again and will be processed */
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(FD_ISSET (MHD_itc_r_fd_ (daemon->itc),
read_fd_set)) )
MHD_itc_clear_ (daemon->itc);
/* Resuming external connections when using an extern mainloop */
if (MHD_USE_SUSPEND_RESUME == (daemon->options & mask))
resume_suspended_connections (daemon);
#ifdef EPOLL_SUPPORT
if (0 != (daemon->options & MHD_USE_EPOLL))
{
/* we're in epoll mode, the epoll FD stands for
the entire event set! */
if (! MHD_SCKT_FD_FITS_FDSET_(daemon->epoll_fd,
NULL))
return MHD_NO; /* poll fd too big, fail hard */
if (FD_ISSET (daemon->epoll_fd,
read_fd_set))
return MHD_run (daemon);
return MHD_YES;
}
#endif
/* select connection thread handling type */
if ( (MHD_INVALID_SOCKET != (ds = daemon->socket_fd)) &&
(FD_ISSET (ds,
read_fd_set)) )
(void) MHD_accept_connection (daemon);
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
/* do not have a thread per connection, process all connections now */
next = daemon->connections_head;
while (NULL != (pos = next))
{
next = pos->next;
ds = pos->socket_fd;
if (MHD_INVALID_SOCKET == ds)
continue;
call_handlers (pos,
FD_ISSET (ds,
read_fd_set),
FD_ISSET (ds,
write_fd_set),
MHD_NO);
}
}
/* handle upgraded HTTPS connections */
#if HTTPS_SUPPORT
for (urh = daemon->urh_head; NULL != urh; urh = urhn)
{
urhn = urh->next;
/* update urh state based on select() output */
urh_from_fdset (urh,
read_fd_set,
write_fd_set);
/* call generic forwarding function for passing data */
process_urh (urh);
}
#endif
MHD_cleanup_connections (daemon);
return MHD_YES;
}
/**
* Main internal select() call. Will compute select sets, call select()
* and then #MHD_run_from_select with the result.
*
* @param daemon daemon to run select() loop for
* @param may_block #MHD_YES if blocking, #MHD_NO if non-blocking
* @return #MHD_NO on serious errors, #MHD_YES on success
*/
static int
MHD_select (struct MHD_Daemon *daemon,
int may_block)
{
int num_ready;
fd_set rs;
fd_set ws;
fd_set es;
MHD_socket maxsock;
struct timeval timeout;
struct timeval *tv;
MHD_UNSIGNED_LONG_LONG ltimeout;
int err_state;
timeout.tv_sec = 0;
timeout.tv_usec = 0;
if (MHD_YES == daemon->shutdown)
return MHD_NO;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
maxsock = MHD_INVALID_SOCKET;
err_state = MHD_NO;
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
if ( (MHD_USE_SUSPEND_RESUME == (daemon->options & MHD_USE_SUSPEND_RESUME)) &&
(MHD_YES == resume_suspended_connections (daemon)) )
may_block = MHD_NO;
/* single-threaded, go over everything */
if (MHD_NO ==
MHD_get_fdset2 (daemon,
&rs,
&ws,
&es,
&maxsock,
FD_SETSIZE))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Could not obtain daemon fdsets"));
#endif
err_state = MHD_YES;
}
}
else
{
/* accept only, have one thread per connection */
if ( (MHD_INVALID_SOCKET != daemon->socket_fd) &&
(! MHD_add_to_fd_set_ (daemon->socket_fd,
&rs,
&maxsock,
FD_SETSIZE)) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Could not add listen socket to fdset"));
#endif
return MHD_NO;
}
}
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(! MHD_add_to_fd_set_ (MHD_itc_r_fd_ (daemon->itc),
&rs,
&maxsock,
FD_SETSIZE)) )
{
#if defined(MHD_WINSOCK_SOCKETS)
/* fdset limit reached, new connections
cannot be handled. Remove listen socket FD
from fdset and retry to add ITC FD. */
if (MHD_INVALID_SOCKET != daemon->socket_fd)
{
FD_CLR (daemon->socket_fd,
&rs);
if (! MHD_add_to_fd_set_ (MHD_itc_r_fd_(daemon->itc),
&rs,
&maxsock,
FD_SETSIZE))
{
#endif /* MHD_WINSOCK_SOCKETS */
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Could not add control inter-thread communication channel FD to fdset"));
#endif
err_state = MHD_YES;
#if defined(MHD_WINSOCK_SOCKETS)
}
}
#endif /* MHD_WINSOCK_SOCKETS */
}
/* Stop listening if we are at the configured connection limit */
/* If we're at the connection limit, no point in really
accepting new connections; however, make sure we do not miss
the shutdown OR the termination of an existing connection; so
only do this optimization if we have a signaling ITC in
place. */
if ( (MHD_INVALID_SOCKET != daemon->socket_fd) &&
(MHD_ITC_IS_VALID_(daemon->itc)) &&
(0 != (daemon->options & MHD_USE_ITC)) &&
( (daemon->connections == daemon->connection_limit) ||
(MHD_YES == daemon->at_limit) ) )
{
FD_CLR (daemon->socket_fd,
&rs);
}
tv = NULL;
if (MHD_YES == err_state)
may_block = MHD_NO;
if (MHD_NO == may_block)
{
timeout.tv_usec = 0;
timeout.tv_sec = 0;
tv = &timeout;
}
else if ( (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) &&
(MHD_YES == MHD_get_timeout (daemon, <imeout)) )
{
/* ltimeout is in ms */
timeout.tv_usec = (ltimeout % 1000) * 1000;
if (ltimeout / 1000 > TIMEVAL_TV_SEC_MAX)
timeout.tv_sec = TIMEVAL_TV_SEC_MAX;
else
timeout.tv_sec = (_MHD_TIMEVAL_TV_SEC_TYPE)(ltimeout / 1000);
tv = &timeout;
}
num_ready = MHD_SYS_select_ (maxsock + 1,
&rs,
&ws,
&es,
tv);
if (MHD_YES == daemon->shutdown)
return MHD_NO;
if (num_ready < 0)
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_(err))
return (MHD_NO == err_state) ? MHD_YES : MHD_NO;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("select failed: %s\n"),
MHD_socket_strerr_ (err));
#endif
return MHD_NO;
}
if (MHD_YES == MHD_run_from_select (daemon,
&rs,
&ws,
&es))
return (MHD_NO == err_state) ? MHD_YES : MHD_NO;
return MHD_NO;
}
#ifdef HAVE_POLL
/**
* Process all of our connections and possibly the server
* socket using poll().
*
* @param daemon daemon to run poll loop for
* @param may_block #MHD_YES if blocking, #MHD_NO if non-blocking
* @return #MHD_NO on serious errors, #MHD_YES on success
*/
static int
MHD_poll_all (struct MHD_Daemon *daemon,
int may_block)
{
unsigned int num_connections;
struct MHD_Connection *pos;
struct MHD_Connection *next;
#if HTTPS_SUPPORT
struct MHD_UpgradeResponseHandle *urh;
struct MHD_UpgradeResponseHandle *urhn;
#endif
if ( (MHD_USE_SUSPEND_RESUME == (daemon->options & MHD_USE_SUSPEND_RESUME)) &&
(MHD_YES == resume_suspended_connections (daemon)) )
may_block = MHD_NO;
/* count number of connections and thus determine poll set size */
num_connections = 0;
for (pos = daemon->connections_head; NULL != pos; pos = pos->next)
num_connections++;
#if HTTPS_SUPPORT
for (urh = daemon->urh_head; NULL != urh; urh = urh->next)
num_connections += 2;
#endif
{
MHD_UNSIGNED_LONG_LONG ltimeout;
unsigned int i;
int timeout;
unsigned int poll_server;
int poll_listen;
int poll_itc_idx;
struct pollfd *p;
p = malloc (sizeof (struct pollfd) * (2 + num_connections));
if (NULL == p)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Error allocating memory: %s\n"),
MHD_strerror_(errno));
#endif
return MHD_NO;
}
memset (p,
0,
sizeof (struct pollfd) * (2 + num_connections));
poll_server = 0;
poll_listen = -1;
if ( (MHD_INVALID_SOCKET != daemon->socket_fd) &&
(daemon->connections < daemon->connection_limit) &&
(MHD_NO == daemon->at_limit) )
{
/* only listen if we are not at the connection limit */
p[poll_server].fd = daemon->socket_fd;
p[poll_server].events = POLLIN;
p[poll_server].revents = 0;
poll_listen = (int) poll_server;
poll_server++;
}
poll_itc_idx = -1;
if (MHD_ITC_IS_VALID_(daemon->itc))
{
p[poll_server].fd = MHD_itc_r_fd_ (daemon->itc);
p[poll_server].events = POLLIN;
p[poll_server].revents = 0;
poll_itc_idx = (int) poll_server;
poll_server++;
}
if (may_block == MHD_NO)
timeout = 0;
else if ( (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
(MHD_YES != MHD_get_timeout (daemon,
<imeout)) )
timeout = -1;
else
timeout = (ltimeout > INT_MAX) ? INT_MAX : (int) ltimeout;
i = 0;
for (pos = daemon->connections_head; NULL != pos; pos = pos->next)
{
p[poll_server+i].fd = pos->socket_fd;
switch (pos->event_loop_info)
{
case MHD_EVENT_LOOP_INFO_READ:
p[poll_server+i].events |= POLLIN;
break;
case MHD_EVENT_LOOP_INFO_WRITE:
p[poll_server+i].events |= POLLOUT;
if (pos->read_buffer_size > pos->read_buffer_offset)
p[poll_server+i].events |= POLLIN;
break;
case MHD_EVENT_LOOP_INFO_BLOCK:
if (pos->read_buffer_size > pos->read_buffer_offset)
p[poll_server+i].events |= POLLIN;
break;
case MHD_EVENT_LOOP_INFO_CLEANUP:
timeout = 0; /* clean up "pos" immediately */
break;
}
i++;
}
#if HTTPS_SUPPORT
for (urh = daemon->urh_head; NULL != urh; urh = urh->next)
{
p[poll_server+i].fd = urh->connection->socket_fd;
if (urh->in_buffer_used < urh->in_buffer_size)
p[poll_server+i].events |= POLLIN;
if (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->app.celi))
p[poll_server+i].events |= POLLOUT;
i++;
p[poll_server+i].fd = urh->mhd.socket;
if (urh->out_buffer_used < urh->out_buffer_size)
p[poll_server+i].events |= POLLIN;
if (0 == (MHD_EPOLL_STATE_WRITE_READY & urh->mhd.celi))
p[poll_server+i].events |= POLLOUT;
i++;
}
#endif
if (0 == poll_server + num_connections)
{
free(p);
return MHD_YES;
}
if (MHD_sys_poll_(p,
poll_server + num_connections,
timeout) < 0)
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_ (err))
{
free(p);
return MHD_YES;
}
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("poll failed: %s\n"),
MHD_socket_strerr_ (err));
#endif
free(p);
return MHD_NO;
}
/* handle ITC FD */
/* do it before any other processing so
new signals will be processed in next loop */
if ( (-1 != poll_itc_idx) &&
(0 != (p[poll_itc_idx].revents & POLLIN)) )
MHD_itc_clear_ (daemon->itc);
/* handle shutdown */
if (MHD_YES == daemon->shutdown)
{
free(p);
return MHD_NO;
}
i = 0;
next = daemon->connections_head;
while (NULL != (pos = next))
{
next = pos->next;
/* first, sanity checks */
if (i >= num_connections)
break; /* connection list changed somehow, retry later ... */
if (p[poll_server+i].fd != pos->socket_fd)
continue; /* fd mismatch, something else happened, retry later ... */
call_handlers (pos,
0 != (p[poll_server+i].revents & POLLIN),
0 != (p[poll_server+i].revents & POLLOUT),
MHD_NO);
i++;
}
#if HTTPS_SUPPORT
for (urh = daemon->urh_head; NULL != urh; urh = urhn)
{
if (i >= num_connections)
break; /* connection list changed somehow, retry later ... */
urhn = urh->next;
if (p[poll_server+i].fd != urh->connection->socket_fd)
continue; /* fd mismatch, something else happened, retry later ... */
if (0 != (p[poll_server+i].revents & POLLIN))
urh->app.celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (p[poll_server+i].revents & POLLOUT))
urh->app.celi |= MHD_EPOLL_STATE_WRITE_READY;
i++;
if (p[poll_server+i].fd != urh->mhd.socket)
{
/* fd mismatch, something else happened, retry later ... */
/* may still be able to do something based on updates
to socket_fd availability */
process_urh (urh);
continue;
}
if (0 != (p[poll_server+i].revents & POLLIN))
urh->mhd.celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (p[poll_server+i].revents & POLLOUT))
urh->mhd.celi |= MHD_EPOLL_STATE_WRITE_READY;
i++;
process_urh (urh);
}
#endif
/* handle 'listen' FD */
if ( (-1 != poll_listen) &&
(0 != (p[poll_listen].revents & POLLIN)) )
(void) MHD_accept_connection (daemon);
free(p);
}
return MHD_YES;
}
/**
* Process only the listen socket using poll().
*
* @param daemon daemon to run poll loop for
* @param may_block #MHD_YES if blocking, #MHD_NO if non-blocking
* @return #MHD_NO on serious errors, #MHD_YES on success
*/
static int
MHD_poll_listen_socket (struct MHD_Daemon *daemon,
int may_block)
{
struct pollfd p[2];
int timeout;
unsigned int poll_count;
int poll_listen;
int poll_itc_idx;
memset (&p,
0,
sizeof (p));
poll_count = 0;
poll_listen = -1;
poll_itc_idx = -1;
if (MHD_INVALID_SOCKET != daemon->socket_fd)
{
p[poll_count].fd = daemon->socket_fd;
p[poll_count].events = POLLIN;
p[poll_count].revents = 0;
poll_listen = poll_count;
poll_count++;
}
if (MHD_ITC_IS_VALID_(daemon->itc))
{
p[poll_count].fd = MHD_itc_r_fd_ (daemon->itc);
p[poll_count].events = POLLIN;
p[poll_count].revents = 0;
poll_itc_idx = poll_count;
poll_count++;
}
if (MHD_NO == may_block)
timeout = 0;
else
timeout = -1;
if (0 == poll_count)
return MHD_YES;
if (MHD_sys_poll_(p,
poll_count,
timeout) < 0)
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_ (err))
return MHD_YES;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("poll failed: %s\n"),
MHD_socket_strerr_ (err));
#endif
return MHD_NO;
}
if ( (-1 != poll_itc_idx) &&
(0 != (p[poll_itc_idx].revents & POLLIN)) )
MHD_itc_clear_ (daemon->itc);
/* handle shutdown */
if (MHD_YES == daemon->shutdown)
return MHD_NO;
if ( (-1 != poll_listen) &&
(0 != (p[poll_listen].revents & POLLIN)) )
(void) MHD_accept_connection (daemon);
return MHD_YES;
}
#endif
/**
* Do poll()-based processing.
*
* @param daemon daemon to run poll()-loop for
* @param may_block #MHD_YES if blocking, #MHD_NO if non-blocking
* @return #MHD_NO on serious errors, #MHD_YES on success
*/
static int
MHD_poll (struct MHD_Daemon *daemon,
int may_block)
{
#ifdef HAVE_POLL
if (MHD_YES == daemon->shutdown)
return MHD_NO;
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
return MHD_poll_all (daemon,
may_block);
return MHD_poll_listen_socket (daemon,
may_block);
#else
return MHD_NO;
#endif
}
#ifdef EPOLL_SUPPORT
/**
* How many events to we process at most per epoll() call? Trade-off
* between required stack-size and number of system calls we have to
* make; 128 should be way enough to avoid more than one system call
* for most scenarios, and still be moderate in stack size
* consumption. Embedded systems might want to choose a smaller value
* --- but why use epoll() on such a system in the first place?
*/
#define MAX_EVENTS 128
#if HTTPS_SUPPORT
/**
* Do epoll()-based processing for TLS connections that have been
* upgraded. This requires a separate epoll() invocation as we
* cannot use the `struct MHD_Connection` data structures for
* the `union epoll_data` in this case.
*/
static int
run_epoll_for_upgrade (struct MHD_Daemon *daemon)
{
struct epoll_event events[MAX_EVENTS];
int num_events;
unsigned int i;
unsigned int j;
num_events = MAX_EVENTS;
while (MAX_EVENTS == num_events)
{
/* update event masks */
num_events = epoll_wait (daemon->epoll_upgrade_fd,
events,
MAX_EVENTS,
0);
if (-1 == num_events)
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_ (err))
return MHD_YES;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_wait failed: %s\n"),
MHD_socket_strerr_ (err));
#endif
return MHD_NO;
}
for (i=0;i<(unsigned int) num_events;i++)
{
struct UpgradeEpollHandle *ueh = events[i].data.ptr;
struct MHD_UpgradeResponseHandle *urh;
if (NULL == ueh)
continue; /* was killed, see below */
urh = ueh->urh;
/* In case we get two events for the same upgrade handle,
squash them together (otherwise the first one may
cause us to free the 'urh', and the second one then
causes a use-after-free). */
for (j=i+1;j< (unsigned int) num_events;j++)
{
struct UpgradeEpollHandle *uehj = events[j].data.ptr;
struct MHD_UpgradeResponseHandle *urhj;
if (NULL == uehj)
continue; /* was killed, see below */
urhj = uehj->urh;
if (urh == urhj) /* yep, indeed the same! */
{
if (0 != (events[j].events & EPOLLIN))
uehj->celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (events[j].events & EPOLLOUT))
uehj->celi |= MHD_EPOLL_STATE_WRITE_READY;
}
events[j].data.ptr = NULL; /* kill this one */
}
/* Update our state based on what is ready according to epoll() */
if (0 != (events[i].events & EPOLLIN))
ueh->celi |= MHD_EPOLL_STATE_READ_READY;
if (0 != (events[i].events & EPOLLOUT))
ueh->celi |= MHD_EPOLL_STATE_WRITE_READY;
/* shuffle data based on buffers and FD readyness */
process_urh (urh);
}
}
return MHD_YES;
}
#endif
/**
* Do epoll()-based processing (this function is allowed to
* block if @a may_block is set to #MHD_YES).
*
* @param daemon daemon to run poll loop for
* @param may_block #MHD_YES if blocking, #MHD_NO if non-blocking
* @return #MHD_NO on serious errors, #MHD_YES on success
*/
static int
MHD_epoll (struct MHD_Daemon *daemon,
int may_block)
{
#if HTTPS_SUPPORT
static const char *upgrade_marker = "upgrade_ptr";
#endif
struct MHD_Connection *pos;
struct MHD_Connection *next;
struct epoll_event events[MAX_EVENTS];
struct epoll_event event;
int timeout_ms;
MHD_UNSIGNED_LONG_LONG timeout_ll;
int num_events;
unsigned int i;
unsigned int series_length;
if (-1 == daemon->epoll_fd)
return MHD_NO; /* we're down! */
if (MHD_YES == daemon->shutdown)
return MHD_NO;
if ( (MHD_INVALID_SOCKET != daemon->socket_fd) &&
(daemon->connections < daemon->connection_limit) &&
(MHD_NO == daemon->listen_socket_in_epoll) &&
(MHD_NO == daemon->at_limit) )
{
event.events = EPOLLIN;
event.data.ptr = daemon;
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
daemon->socket_fd,
&event))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_ctl failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
return MHD_NO;
}
daemon->listen_socket_in_epoll = MHD_YES;
}
#if HTTPS_SUPPORT
if ( (MHD_NO == daemon->upgrade_fd_in_epoll) &&
(-1 != daemon->epoll_upgrade_fd) )
{
event.events = EPOLLIN | EPOLLOUT;
event.data.ptr = (void *) upgrade_marker;
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
daemon->epoll_upgrade_fd,
&event))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_ctl failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
return MHD_NO;
}
daemon->upgrade_fd_in_epoll = MHD_YES;
}
#endif
if ( ( (MHD_YES == daemon->listen_socket_in_epoll) &&
(daemon->connections == daemon->connection_limit) ) ||
(MHD_YES == daemon->at_limit) )
{
/* we're at the connection limit, disable listen socket
for event loop for now */
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_DEL,
daemon->socket_fd,
NULL))
MHD_PANIC (_("Failed to remove listen FD from epoll set\n"));
daemon->listen_socket_in_epoll = MHD_NO;
}
if (MHD_YES == may_block)
{
if (MHD_YES == MHD_get_timeout (daemon,
&timeout_ll))
{
if (timeout_ll >= (MHD_UNSIGNED_LONG_LONG) INT_MAX)
timeout_ms = INT_MAX;
else
timeout_ms = (int) timeout_ll;
}
else
timeout_ms = -1;
}
else
timeout_ms = 0;
/* drain 'epoll' event queue; need to iterate as we get at most
MAX_EVENTS in one system call here; in practice this should
pretty much mean only one round, but better an extra loop here
than unfair behavior... */
num_events = MAX_EVENTS;
while (MAX_EVENTS == num_events)
{
/* update event masks */
num_events = epoll_wait (daemon->epoll_fd,
events,
MAX_EVENTS,
timeout_ms);
if (-1 == num_events)
{
const int err = MHD_socket_get_error_ ();
if (MHD_SCKT_ERR_IS_EINTR_ (err))
return MHD_YES;
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_wait failed: %s\n"),
MHD_socket_strerr_ (err));
#endif
return MHD_NO;
}
for (i=0;i<(unsigned int) num_events;i++)
{
/* First, check for the values of `ptr` that would indicate
that this event is not about a normal connection. */
if (NULL == events[i].data.ptr)
continue; /* shutdown signal! */
#if HTTPS_SUPPORT
if (upgrade_marker == events[i].data.ptr)
{
/* activity on an upgraded connection, we process
those in a separate epoll() */
run_epoll_for_upgrade (daemon);
continue;
}
#endif
/* UGH: we're storing pointers and fds in the same union
here; incredibly ugly and somewhat risky, even though a
pointer with the same numeric value as the itc.fd[0] can
be expected to be rare... FIXME (a construction similar
to what we did with the `upgrade_marker` should do) */
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(MHD_itc_r_fd_ (daemon->itc) == events[i].data.fd) )
{
/* It's OK to clear ITC here as all external
conditions will be processed later. */
MHD_itc_clear_ (daemon->itc);
continue;
}
if (daemon == events[i].data.ptr)
{
/* run 'accept' until it fails or we are not allowed to take
on more connections */
series_length = 0;
while ( (MHD_YES == MHD_accept_connection (daemon)) &&
(daemon->connections < daemon->connection_limit) &&
(series_length < 128) &&
(MHD_NO == daemon->at_limit) )
series_length++;
continue;
}
/* this is an event relating to a 'normal' connection,
remember the event and if appropriate mark the
connection as 'eready'. */
pos = events[i].data.ptr;
/* normal processing: update read/write data */
if (0 != (events[i].events & EPOLLIN))
{
pos->epoll_state |= MHD_EPOLL_STATE_READ_READY;
if ( ( (MHD_EVENT_LOOP_INFO_READ == pos->event_loop_info) ||
(pos->read_buffer_size > pos->read_buffer_offset) ) &&
(0 == (pos->epoll_state & MHD_EPOLL_STATE_IN_EREADY_EDLL) ) )
{
EDLL_insert (daemon->eready_head,
daemon->eready_tail,
pos);
pos->epoll_state |= MHD_EPOLL_STATE_IN_EREADY_EDLL;
}
}
if (0 != (events[i].events & EPOLLOUT))
{
pos->epoll_state |= MHD_EPOLL_STATE_WRITE_READY;
if ( (MHD_EVENT_LOOP_INFO_WRITE == pos->event_loop_info) &&
(0 == (pos->epoll_state & MHD_EPOLL_STATE_IN_EREADY_EDLL) ) )
{
EDLL_insert (daemon->eready_head,
daemon->eready_tail,
pos);
pos->epoll_state |= MHD_EPOLL_STATE_IN_EREADY_EDLL;
}
}
}
}
/* we handle resumes here because we may have ready connections
that will not be placed into the epoll list immediately. */
if (MHD_USE_SUSPEND_RESUME == (daemon->options & MHD_USE_SUSPEND_RESUME))
(void) resume_suspended_connections (daemon);
/* process events for connections */
while (NULL != (pos = daemon->eready_tail))
{
EDLL_remove (daemon->eready_head,
daemon->eready_tail,
pos);
pos->epoll_state &= ~MHD_EPOLL_STATE_IN_EREADY_EDLL;
call_handlers (pos,
MHD_EVENT_LOOP_INFO_READ == pos->event_loop_info,
MHD_EVENT_LOOP_INFO_WRITE == pos->event_loop_info,
MHD_NO);
}
/* Finally, handle timed-out connections; we need to do this here
as the epoll mechanism won't call the 'idle_handler' on everything,
as the other event loops do. As timeouts do not get an explicit
event, we need to find those connections that might have timed out
here.
Connections with custom timeouts must all be looked at, as we
do not bother to sort that (presumably very short) list. */
next = daemon->manual_timeout_head;
while (NULL != (pos = next))
{
next = pos->nextX;
pos->idle_handler (pos);
}
/* Connections with the default timeout are sorted by prepending
them to the head of the list whenever we touch the connection;
thus it suffices to iterate from the tail until the first
connection is NOT timed out */
next = daemon->normal_timeout_tail;
while (NULL != (pos = next))
{
next = pos->prevX;
pos->idle_handler (pos);
if (MHD_CONNECTION_CLOSED != pos->state)
break; /* sorted by timeout, no need to visit the rest! */
}
return MHD_YES;
}
#endif
/**
* Run webserver operations (without blocking unless in client
* callbacks). This method should be called by clients in combination
* with #MHD_get_fdset if the client-controlled select method is used.
*
* This function is a convenience method, which is useful if the
* fd_sets from #MHD_get_fdset were not directly passed to `select()`;
* with this function, MHD will internally do the appropriate `select()`
* call itself again. While it is always safe to call #MHD_run (in
* external select mode), you should call #MHD_run_from_select if
* performance is important (as it saves an expensive call to
* `select()`).
*
* @param daemon daemon to run
* @return #MHD_YES on success, #MHD_NO if this
* daemon was not started with the right
* options for this call.
* @ingroup event
*/
int
MHD_run (struct MHD_Daemon *daemon)
{
if ( (MHD_YES == daemon->shutdown) ||
(0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
(0 != (daemon->options & MHD_USE_SELECT_INTERNALLY)) )
return MHD_NO;
if (0 != (daemon->options & MHD_USE_POLL))
{
MHD_poll (daemon, MHD_NO);
MHD_cleanup_connections (daemon);
}
#ifdef EPOLL_SUPPORT
else if (0 != (daemon->options & MHD_USE_EPOLL))
{
MHD_epoll (daemon, MHD_NO);
MHD_cleanup_connections (daemon);
}
#endif
else
{
MHD_select (daemon, MHD_NO);
/* MHD_select does MHD_cleanup_connections already */
}
return MHD_YES;
}
/**
* Close the given connection, remove it from all of its
* DLLs and move it into the cleanup queue.
* @remark To be called only from thread that
* process daemon's select()/poll()/etc.
*
* @param pos connection to move to cleanup
*/
static void
close_connection (struct MHD_Connection *pos)
{
struct MHD_Daemon *daemon = pos->daemon;
pos->state = MHD_CONNECTION_CLOSED;
pos->event_loop_info = MHD_EVENT_LOOP_INFO_CLEANUP;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
return; /* must let thread to the rest */
MHD_connection_close_ (pos,
MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN);
if (pos->connection_timeout == pos->daemon->connection_timeout)
XDLL_remove (daemon->normal_timeout_head,
daemon->normal_timeout_tail,
pos);
else
XDLL_remove (daemon->manual_timeout_head,
daemon->manual_timeout_tail,
pos);
DLL_remove (daemon->connections_head,
daemon->connections_tail,
pos);
DLL_insert (daemon->cleanup_head,
daemon->cleanup_tail,
pos);
}
/**
* Thread that runs the select loop until the daemon
* is explicitly shut down.
*
* @param cls `struct MHD_Deamon` to run select loop in a thread for
* @return always 0 (on shutdown)
*/
static MHD_THRD_RTRN_TYPE_ MHD_THRD_CALL_SPEC_
MHD_select_thread (void *cls)
{
struct MHD_Daemon *daemon = cls;
struct MHD_Connection *pos;
while (MHD_YES != daemon->shutdown)
{
if (0 != (daemon->options & MHD_USE_POLL))
MHD_poll (daemon, MHD_YES);
#ifdef EPOLL_SUPPORT
else if (0 != (daemon->options & MHD_USE_EPOLL))
MHD_epoll (daemon, MHD_YES);
#endif
else
MHD_select (daemon, MHD_YES);
MHD_cleanup_connections (daemon);
}
/* give resumed formerly suspended connections a chance to
be included in the cleanup */
resume_suspended_connections (daemon);
/* run clean up in this thread as well */
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
/* We did everything in this thread, so also the clean up */
while (NULL != (pos = daemon->connections_head))
close_connection (pos);
}
return (MHD_THRD_RTRN_TYPE_)0;
}
/**
* Process escape sequences ('%HH') Updates val in place; the
* result should be UTF-8 encoded and cannot be larger than the input.
* The result must also still be 0-terminated.
*
* @param cls closure (use NULL)
* @param connection handle to connection, not used
* @param val value to unescape (modified in the process)
* @return length of the resulting val (strlen(val) maybe
* shorter afterwards due to elimination of escape sequences)
*/
static size_t
unescape_wrapper (void *cls,
struct MHD_Connection *connection,
char *val)
{
return MHD_http_unescape (val);
}
/**
* Start a webserver on the given port. Variadic version of
* #MHD_start_daemon_va.
*
* @param flags combination of `enum MHD_FLAG` values
* @param port port to bind to
* @param apc callback to call to check which clients
* will be allowed to connect; you can pass NULL
* in which case connections from any IP will be
* accepted
* @param apc_cls extra argument to @a apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to @a dh
* @return NULL on error, handle to daemon on success
* @ingroup event
*/
struct MHD_Daemon *
MHD_start_daemon (unsigned int flags,
uint16_t port,
MHD_AcceptPolicyCallback apc,
void *apc_cls,
MHD_AccessHandlerCallback dh,
void *dh_cls,
...)
{
struct MHD_Daemon *daemon;
va_list ap;
va_start (ap,
dh_cls);
daemon = MHD_start_daemon_va (flags,
port,
apc,
apc_cls,
dh,
dh_cls,
ap);
va_end (ap);
return daemon;
}
/**
* Stop accepting connections from the listening socket. Allows
* clients to continue processing, but stops accepting new
* connections. Note that the caller is responsible for closing the
* returned socket; however, if MHD is run using threads (anything but
* external select mode), socket will be removed from existing threads
* with some delay and it must not be closed while it's in use. To make
* sure that socket is not used anymore, call #MHD_stop_daemon.
*
* Note that some thread modes require the caller to have passed
* #MHD_USE_ITC when using this API. If this daemon is
* in one of those modes and this option was not given to
* #MHD_start_daemon, this function will return #MHD_INVALID_SOCKET.
*
* @param daemon daemon to stop accepting new connections for
* @return old listen socket on success, #MHD_INVALID_SOCKET if
* the daemon was already not listening anymore
* @ingroup specialized
*/
MHD_socket
MHD_quiesce_daemon (struct MHD_Daemon *daemon)
{
unsigned int i;
MHD_socket ret;
ret = daemon->socket_fd;
if (MHD_INVALID_SOCKET == ret)
return MHD_INVALID_SOCKET;
if ( (MHD_ITC_IS_INVALID_(daemon->itc)) &&
(0 != (daemon->options & (MHD_USE_SELECT_INTERNALLY | MHD_USE_THREAD_PER_CONNECTION))) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
"Using MHD_quiesce_daemon in this mode requires MHD_USE_ITC\n");
#endif
return MHD_INVALID_SOCKET;
}
if (NULL != daemon->worker_pool)
for (i = 0; i < daemon->worker_pool_size; i++)
{
daemon->worker_pool[i].socket_fd = MHD_INVALID_SOCKET;
#ifdef EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(-1 != daemon->worker_pool[i].epoll_fd) &&
(MHD_YES == daemon->worker_pool[i].listen_socket_in_epoll) )
{
if (0 != epoll_ctl (daemon->worker_pool[i].epoll_fd,
EPOLL_CTL_DEL,
ret,
NULL))
MHD_PANIC (_("Failed to remove listen FD from epoll set\n"));
daemon->worker_pool[i].listen_socket_in_epoll = MHD_NO;
}
else
#endif
if (MHD_ITC_IS_VALID_(daemon->worker_pool[i].itc))
{
if (! MHD_itc_activate_ (daemon->worker_pool[i].itc, "q"))
MHD_PANIC (_("Failed to signal quiesce via inter-thread communication channel"));
}
}
daemon->socket_fd = MHD_INVALID_SOCKET;
#ifdef EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(-1 != daemon->epoll_fd) &&
(MHD_YES == daemon->listen_socket_in_epoll) )
{
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_DEL,
ret,
NULL))
MHD_PANIC ("Failed to remove listen FD from epoll set\n");
daemon->listen_socket_in_epoll = MHD_NO;
}
else
#endif
if (MHD_ITC_IS_VALID_(daemon->itc))
{
if (! MHD_itc_activate_ (daemon->itc, "q"))
MHD_PANIC (_("failed to signal quiesce via inter-thread communication channel"));
}
return ret;
}
/**
* Signature of the MHD custom logger function.
*
* @param cls closure
* @param format format string
* @param va arguments to the format string (fprintf-style)
*/
typedef void
(*VfprintfFunctionPointerType)(void *cls,
const char *format,
va_list va);
/**
* Parse a list of options given as varargs.
*
* @param daemon the daemon to initialize
* @param servaddr where to store the server's listen address
* @param ap the options
* @return #MHD_YES on success, #MHD_NO on error
*/
static int
parse_options_va (struct MHD_Daemon *daemon,
const struct sockaddr **servaddr,
va_list ap);
/**
* Parse a list of options given as varargs.
*
* @param daemon the daemon to initialize
* @param servaddr where to store the server's listen address
* @param ... the options
* @return #MHD_YES on success, #MHD_NO on error
*/
static int
parse_options (struct MHD_Daemon *daemon,
const struct sockaddr **servaddr,
...)
{
va_list ap;
int ret;
va_start (ap, servaddr);
ret = parse_options_va (daemon,
servaddr,
ap);
va_end (ap);
return ret;
}
/**
* Parse a list of options given as varargs.
*
* @param daemon the daemon to initialize
* @param servaddr where to store the server's listen address
* @param ap the options
* @return #MHD_YES on success, #MHD_NO on error
*/
static int
parse_options_va (struct MHD_Daemon *daemon,
const struct sockaddr **servaddr,
va_list ap)
{
enum MHD_OPTION opt;
struct MHD_OptionItem *oa;
unsigned int i;
#if HTTPS_SUPPORT
int ret;
const char *pstr;
#endif
while (MHD_OPTION_END != (opt = (enum MHD_OPTION) va_arg (ap, int)))
{
switch (opt)
{
case MHD_OPTION_CONNECTION_MEMORY_LIMIT:
daemon->pool_size = va_arg (ap,
size_t);
break;
case MHD_OPTION_CONNECTION_MEMORY_INCREMENT:
daemon->pool_increment= va_arg (ap,
size_t);
break;
case MHD_OPTION_CONNECTION_LIMIT:
daemon->connection_limit = va_arg (ap,
unsigned int);
break;
case MHD_OPTION_CONNECTION_TIMEOUT:
daemon->connection_timeout = va_arg (ap,
unsigned int);
break;
case MHD_OPTION_NOTIFY_COMPLETED:
daemon->notify_completed = va_arg (ap,
MHD_RequestCompletedCallback);
daemon->notify_completed_cls = va_arg (ap,
void *);
break;
case MHD_OPTION_NOTIFY_CONNECTION:
daemon->notify_connection = va_arg (ap,
MHD_NotifyConnectionCallback);
daemon->notify_connection_cls = va_arg (ap,
void *);
break;
case MHD_OPTION_PER_IP_CONNECTION_LIMIT:
daemon->per_ip_connection_limit = va_arg (ap,
unsigned int);
break;
case MHD_OPTION_SOCK_ADDR:
*servaddr = va_arg (ap,
const struct sockaddr *);
break;
case MHD_OPTION_URI_LOG_CALLBACK:
daemon->uri_log_callback = va_arg (ap,
LogCallback);
daemon->uri_log_callback_cls = va_arg (ap,
void *);
break;
case MHD_OPTION_THREAD_POOL_SIZE:
daemon->worker_pool_size = va_arg (ap,
unsigned int);
if (daemon->worker_pool_size >= (SIZE_MAX / sizeof (struct MHD_Daemon)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Specified thread pool size (%u) too big\n"),
daemon->worker_pool_size);
#endif
return MHD_NO;
}
break;
#if HTTPS_SUPPORT
case MHD_OPTION_HTTPS_MEM_KEY:
if (0 != (daemon->options & MHD_USE_TLS))
daemon->https_mem_key = va_arg (ap,
const char *);
#ifdef HAVE_MESSAGES
else
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD but MHD_USE_TLS not set\n"),
opt);
#endif
break;
case MHD_OPTION_HTTPS_KEY_PASSWORD:
if (0 != (daemon->options & MHD_USE_TLS))
daemon->https_key_password = va_arg (ap,
const char *);
#ifdef HAVE_MESSAGES
else
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD but MHD_USE_TLS not set\n"),
opt);
#endif
break;
case MHD_OPTION_HTTPS_MEM_CERT:
if (0 != (daemon->options & MHD_USE_TLS))
daemon->https_mem_cert = va_arg (ap,
const char *);
#ifdef HAVE_MESSAGES
else
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD but MHD_USE_TLS not set\n"),
opt);
#endif
break;
case MHD_OPTION_HTTPS_MEM_TRUST:
if (0 != (daemon->options & MHD_USE_TLS))
daemon->https_mem_trust = va_arg (ap,
const char *);
#ifdef HAVE_MESSAGES
else
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD but MHD_USE_TLS not set\n"),
opt);
#endif
break;
case MHD_OPTION_HTTPS_CRED_TYPE:
daemon->cred_type = (gnutls_credentials_type_t) va_arg (ap,
int);
break;
case MHD_OPTION_HTTPS_MEM_DHPARAMS:
if (0 != (daemon->options & MHD_USE_TLS))
{
const char *arg = va_arg (ap,
const char *);
gnutls_datum_t dhpar;
if (gnutls_dh_params_init (&daemon->https_mem_dhparams) < 0)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Error initializing DH parameters\n"));
#endif
return MHD_NO;
}
dhpar.data = (unsigned char *) arg;
dhpar.size = strlen (arg);
if (gnutls_dh_params_import_pkcs3 (daemon->https_mem_dhparams,
&dhpar,
GNUTLS_X509_FMT_PEM) < 0)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Bad Diffie-Hellman parameters format\n"));
#endif
gnutls_dh_params_deinit (daemon->https_mem_dhparams);
return MHD_NO;
}
daemon->have_dhparams = MHD_YES;
}
else
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD but MHD_USE_TLS not set\n"),
opt);
#endif
return MHD_NO;
}
break;
case MHD_OPTION_HTTPS_PRIORITIES:
if (0 != (daemon->options & MHD_USE_TLS))
{
gnutls_priority_deinit (daemon->priority_cache);
ret = gnutls_priority_init (&daemon->priority_cache,
pstr = va_arg (ap, const char*),
NULL);
if (GNUTLS_E_SUCCESS != ret)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Setting priorities to `%s' failed: %s\n"),
pstr,
gnutls_strerror (ret));
#endif
daemon->priority_cache = NULL;
return MHD_NO;
}
}
break;
case MHD_OPTION_HTTPS_CERT_CALLBACK:
#if GNUTLS_VERSION_MAJOR < 3
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD_OPTION_HTTPS_CERT_CALLBACK requires building MHD with GnuTLS >= 3.0\n"));
#endif
return MHD_NO;
#else
if (0 != (daemon->options & MHD_USE_TLS))
daemon->cert_callback = va_arg (ap,
gnutls_certificate_retrieve_function2 *);
break;
#endif
#endif
#ifdef DAUTH_SUPPORT
case MHD_OPTION_DIGEST_AUTH_RANDOM:
daemon->digest_auth_rand_size = va_arg (ap,
size_t);
daemon->digest_auth_random = va_arg (ap,
const char *);
break;
case MHD_OPTION_NONCE_NC_SIZE:
daemon->nonce_nc_size = va_arg (ap,
unsigned int);
break;
#endif
case MHD_OPTION_LISTEN_SOCKET:
daemon->socket_fd = va_arg (ap,
MHD_socket);
break;
case MHD_OPTION_EXTERNAL_LOGGER:
#ifdef HAVE_MESSAGES
daemon->custom_error_log = va_arg (ap,
VfprintfFunctionPointerType);
daemon->custom_error_log_cls = va_arg (ap,
void *);
#else
va_arg (ap,
VfprintfFunctionPointerType);
va_arg (ap,
void *);
#endif
break;
case MHD_OPTION_THREAD_STACK_SIZE:
daemon->thread_stack_size = va_arg (ap,
size_t);
break;
#ifdef TCP_FASTOPEN
case MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE:
daemon->fastopen_queue_size = va_arg (ap,
unsigned int);
break;
#endif
case MHD_OPTION_LISTENING_ADDRESS_REUSE:
daemon->listening_address_reuse = va_arg (ap,
unsigned int) ? 1 : -1;
break;
case MHD_OPTION_LISTEN_BACKLOG_SIZE:
daemon->listen_backlog_size = va_arg (ap,
unsigned int);
break;
case MHD_OPTION_ARRAY:
oa = va_arg (ap, struct MHD_OptionItem*);
i = 0;
while (MHD_OPTION_END != (opt = oa[i].option))
{
switch (opt)
{
/* all options taking 'size_t' */
case MHD_OPTION_CONNECTION_MEMORY_LIMIT:
case MHD_OPTION_CONNECTION_MEMORY_INCREMENT:
case MHD_OPTION_THREAD_STACK_SIZE:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(size_t) oa[i].value,
MHD_OPTION_END))
return MHD_NO;
break;
/* all options taking 'unsigned int' */
case MHD_OPTION_NONCE_NC_SIZE:
case MHD_OPTION_CONNECTION_LIMIT:
case MHD_OPTION_CONNECTION_TIMEOUT:
case MHD_OPTION_PER_IP_CONNECTION_LIMIT:
case MHD_OPTION_THREAD_POOL_SIZE:
case MHD_OPTION_TCP_FASTOPEN_QUEUE_SIZE:
case MHD_OPTION_LISTENING_ADDRESS_REUSE:
case MHD_OPTION_LISTEN_BACKLOG_SIZE:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(unsigned int) oa[i].value,
MHD_OPTION_END))
return MHD_NO;
break;
/* all options taking 'enum' */
case MHD_OPTION_HTTPS_CRED_TYPE:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(int) oa[i].value,
MHD_OPTION_END))
return MHD_NO;
break;
/* all options taking 'MHD_socket' */
case MHD_OPTION_LISTEN_SOCKET:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(MHD_socket) oa[i].value,
MHD_OPTION_END))
return MHD_NO;
break;
/* all options taking one pointer */
case MHD_OPTION_SOCK_ADDR:
case MHD_OPTION_HTTPS_MEM_KEY:
case MHD_OPTION_HTTPS_KEY_PASSWORD:
case MHD_OPTION_HTTPS_MEM_CERT:
case MHD_OPTION_HTTPS_MEM_TRUST:
case MHD_OPTION_HTTPS_MEM_DHPARAMS:
case MHD_OPTION_HTTPS_PRIORITIES:
case MHD_OPTION_ARRAY:
case MHD_OPTION_HTTPS_CERT_CALLBACK:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
oa[i].ptr_value,
MHD_OPTION_END))
return MHD_NO;
break;
/* all options taking two pointers */
case MHD_OPTION_NOTIFY_COMPLETED:
case MHD_OPTION_NOTIFY_CONNECTION:
case MHD_OPTION_URI_LOG_CALLBACK:
case MHD_OPTION_EXTERNAL_LOGGER:
case MHD_OPTION_UNESCAPE_CALLBACK:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(void *) oa[i].value,
oa[i].ptr_value,
MHD_OPTION_END))
return MHD_NO;
break;
/* options taking size_t-number followed by pointer */
case MHD_OPTION_DIGEST_AUTH_RANDOM:
if (MHD_YES != parse_options (daemon,
servaddr,
opt,
(size_t) oa[i].value,
oa[i].ptr_value,
MHD_OPTION_END))
return MHD_NO;
break;
default:
return MHD_NO;
}
i++;
}
break;
case MHD_OPTION_UNESCAPE_CALLBACK:
daemon->unescape_callback = va_arg (ap,
UnescapeCallback);
daemon->unescape_callback_cls = va_arg (ap,
void *);
break;
default:
#ifdef HAVE_MESSAGES
if ( ( (opt >= MHD_OPTION_HTTPS_MEM_KEY) &&
(opt <= MHD_OPTION_HTTPS_PRIORITIES) ) ||
(opt == MHD_OPTION_HTTPS_MEM_TRUST))
{
MHD_DLOG (daemon,
_("MHD HTTPS option %d passed to MHD compiled without HTTPS support\n"),
opt);
}
else
{
MHD_DLOG (daemon,
_("Invalid option %d! (Did you terminate the list with MHD_OPTION_END?)\n"),
opt);
}
#endif
return MHD_NO;
}
}
return MHD_YES;
}
#ifdef EPOLL_SUPPORT
static int
setup_epoll_fd (struct MHD_Daemon *daemon)
{
int fd;
#ifdef USE_EPOLL_CREATE1
fd = epoll_create1 (EPOLL_CLOEXEC);
#else /* ! USE_EPOLL_CREATE1 */
fd = epoll_create (MAX_EVENTS);
#endif /* ! USE_EPOLL_CREATE1 */
if (MHD_INVALID_SOCKET == fd)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_create1 failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
return MHD_INVALID_SOCKET;
}
#if !defined(USE_EPOLL_CREATE1)
if (! MHD_socket_noninheritable_ (fd))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set noninheritable mode on epoll FD.\n"));
#endif
}
#endif /* ! USE_EPOLL_CREATE1 */
return fd;
}
/**
* Setup epoll() FD for the daemon and initialize it to listen
* on the listen FD.
*
* @param daemon daemon to initialize for epoll()
* @return #MHD_YES on success, #MHD_NO on failure
*/
static int
setup_epoll_to_listen (struct MHD_Daemon *daemon)
{
struct epoll_event event;
daemon->epoll_fd = setup_epoll_fd (daemon);
if (-1 == daemon->epoll_fd)
return MHD_NO;
#if HTTPS_SUPPORT
if (MHD_USE_TLS_EPOLL_UPGRADE == (MHD_USE_TLS_EPOLL_UPGRADE & daemon->options))
{
daemon->epoll_upgrade_fd = setup_epoll_fd (daemon);
if (MHD_INVALID_SOCKET == daemon->epoll_upgrade_fd)
return MHD_NO;
}
#endif
if (MHD_INVALID_SOCKET == daemon->socket_fd)
return MHD_YES; /* non-listening daemon */
event.events = EPOLLIN;
event.data.ptr = daemon;
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
daemon->socket_fd,
&event))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_ctl failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
return MHD_NO;
}
if ( (MHD_ITC_IS_VALID_(daemon->itc)) &&
(MHD_USE_SUSPEND_RESUME == (daemon->options & MHD_USE_SUSPEND_RESUME)) )
{
event.events = EPOLLIN | EPOLLET;
event.data.ptr = NULL;
event.data.fd = MHD_itc_r_fd_ (daemon->itc);
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
MHD_itc_r_fd_ (daemon->itc),
&event))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Call to epoll_ctl failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
return MHD_NO;
}
}
daemon->listen_socket_in_epoll = MHD_YES;
return MHD_YES;
}
#endif
/**
* Start a webserver on the given port.
*
* @param flags combination of `enum MHD_FLAG` values
* @param port port to bind to (in host byte order)
* @param apc callback to call to check which clients
* will be allowed to connect; you can pass NULL
* in which case connections from any IP will be
* accepted
* @param apc_cls extra argument to @a apc
* @param dh handler called for all requests (repeatedly)
* @param dh_cls extra argument to @a dh
* @param ap list of options (type-value pairs,
* terminated with #MHD_OPTION_END).
* @return NULL on error, handle to daemon on success
* @ingroup event
*/
struct MHD_Daemon *
MHD_start_daemon_va (unsigned int flags,
uint16_t port,
MHD_AcceptPolicyCallback apc,
void *apc_cls,
MHD_AccessHandlerCallback dh,
void *dh_cls,
va_list ap)
{
const MHD_SCKT_OPT_BOOL_ on = 1;
struct MHD_Daemon *daemon;
MHD_socket socket_fd;
struct sockaddr_in servaddr4;
#if HAVE_INET6
struct sockaddr_in6 servaddr6;
#endif
const struct sockaddr *servaddr = NULL;
socklen_t addrlen;
unsigned int i;
int use_itc;
#ifndef HAVE_INET6
if (0 != (flags & MHD_USE_IPv6))
return NULL;
#endif
#ifndef HAVE_POLL
if (0 != (flags & MHD_USE_POLL))
return NULL;
#endif
#if ! HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
return NULL;
#endif
#ifndef TCP_FASTOPEN
if (0 != (flags & MHD_USE_TCP_FASTOPEN))
return NULL;
#endif
if (NULL == dh)
return NULL;
if (NULL == (daemon = malloc (sizeof (struct MHD_Daemon))))
return NULL;
memset (daemon,
0,
sizeof (struct MHD_Daemon));
#ifdef EPOLL_SUPPORT
daemon->epoll_fd = -1;
#if HTTPS_SUPPORT
daemon->epoll_upgrade_fd = -1;
#endif
#endif
/* try to open listen socket */
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
{
gnutls_priority_init (&daemon->priority_cache,
"NORMAL",
NULL);
}
#endif
daemon->socket_fd = MHD_INVALID_SOCKET;
daemon->listening_address_reuse = 0;
daemon->options = flags;
daemon->port = port;
daemon->apc = apc;
daemon->apc_cls = apc_cls;
daemon->default_handler = dh;
daemon->default_handler_cls = dh_cls;
daemon->connections = 0;
daemon->connection_limit = MHD_MAX_CONNECTIONS_DEFAULT;
daemon->pool_size = MHD_POOL_SIZE_DEFAULT;
daemon->pool_increment = MHD_BUF_INC_SIZE;
daemon->unescape_callback = &unescape_wrapper;
daemon->connection_timeout = 0; /* no timeout */
MHD_itc_set_invalid_ (daemon->itc);
#ifdef SOMAXCONN
daemon->listen_backlog_size = SOMAXCONN;
#else /* !SOMAXCONN */
daemon->listen_backlog_size = 511; /* should be safe value */
#endif /* !SOMAXCONN */
#ifdef HAVE_MESSAGES
daemon->custom_error_log = (MHD_LogCallback) &vfprintf;
daemon->custom_error_log_cls = stderr;
#endif
#ifdef HAVE_LISTEN_SHUTDOWN
use_itc = (0 != (daemon->options & (MHD_USE_NO_LISTEN_SOCKET | MHD_USE_ITC)));
#else
use_itc = 1; /* yes, must use ITC to signal thread */
#endif
if (0 == (flags & (MHD_USE_SELECT_INTERNALLY | MHD_USE_THREAD_PER_CONNECTION)))
use_itc = 0; /* useless if we are using 'external' select */
if (use_itc)
{
if (! MHD_itc_init_ (daemon->itc))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to create inter-thread communication channel: %s\n"),
MHD_itc_last_strerror_ ());
#endif
free (daemon);
return NULL;
}
}
if ( (0 == (flags & (MHD_USE_POLL | MHD_USE_EPOLL))) &&
(1 == use_itc) &&
(! MHD_SCKT_FD_FITS_FDSET_(MHD_itc_r_fd_ (daemon->itc),
NULL)) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("file descriptor for inter-thread communication channel exceeds maximum value\n"));
#endif
MHD_itc_destroy_chk_ (daemon->itc);
free (daemon);
return NULL;
}
#ifdef DAUTH_SUPPORT
daemon->digest_auth_rand_size = 0;
daemon->digest_auth_random = NULL;
daemon->nonce_nc_size = 4; /* tiny */
#endif
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
{
daemon->cred_type = GNUTLS_CRD_CERTIFICATE;
}
#endif
if (MHD_YES != parse_options_va (daemon,
&servaddr,
ap))
{
#if HTTPS_SUPPORT
if ( (0 != (flags & MHD_USE_TLS)) &&
(NULL != daemon->priority_cache) )
gnutls_priority_deinit (daemon->priority_cache);
#endif
free (daemon);
return NULL;
}
#ifdef DAUTH_SUPPORT
if (daemon->nonce_nc_size > 0)
{
if ( ( (size_t) (daemon->nonce_nc_size * sizeof (struct MHD_NonceNc))) /
sizeof(struct MHD_NonceNc) != daemon->nonce_nc_size)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Specified value for NC_SIZE too large\n"));
#endif
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
gnutls_priority_deinit (daemon->priority_cache);
#endif
free (daemon);
return NULL;
}
daemon->nnc = malloc (daemon->nonce_nc_size * sizeof (struct MHD_NonceNc));
if (NULL == daemon->nnc)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to allocate memory for nonce-nc map: %s\n"),
MHD_strerror_ (errno));
#endif
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
gnutls_priority_deinit (daemon->priority_cache);
#endif
free (daemon);
return NULL;
}
}
if (! MHD_mutex_init_ (&daemon->nnc_lock))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD failed to initialize nonce-nc mutex\n"));
#endif
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
gnutls_priority_deinit (daemon->priority_cache);
#endif
free (daemon->nnc);
free (daemon);
return NULL;
}
#endif
/* Thread pooling currently works only with internal select thread model */
if ( (0 == (flags & MHD_USE_SELECT_INTERNALLY)) &&
(daemon->worker_pool_size > 0) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD thread pooling only works with MHD_USE_SELECT_INTERNALLY\n"));
#endif
goto free_and_fail;
}
if ( (MHD_USE_SUSPEND_RESUME == (flags & MHD_USE_SUSPEND_RESUME)) &&
(0 != (flags & MHD_USE_THREAD_PER_CONNECTION)) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Combining MHD_USE_THREAD_PER_CONNECTION and MHD_USE_SUSPEND_RESUME is not supported.\n"));
#endif
goto free_and_fail;
}
#ifdef __SYMBIAN32__
if (0 != (flags & (MHD_USE_SELECT_INTERNALLY | MHD_USE_THREAD_PER_CONNECTION)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Threaded operations are not supported on Symbian.\n"));
#endif
goto free_and_fail;
}
#endif
if ( (MHD_INVALID_SOCKET == daemon->socket_fd) &&
(0 == (daemon->options & MHD_USE_NO_LISTEN_SOCKET)) )
{
/* try to open listen socket */
socket_fd = MHD_socket_create_listen_(flags & MHD_USE_IPv6);
if (MHD_INVALID_SOCKET == socket_fd)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to create socket for listening: %s\n"),
MHD_socket_last_strerr_ ());
#endif
goto free_and_fail;
}
/* Apply the socket options according to listening_address_reuse. */
if (0 == daemon->listening_address_reuse)
{
/* No user requirement, use "traditional" default SO_REUSEADDR,
and do not fail if it doesn't work */
if (0 > setsockopt (socket_fd,
SOL_SOCKET,
SO_REUSEADDR,
(void*)&on, sizeof (on)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("setsockopt failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
}
}
else if (daemon->listening_address_reuse > 0)
{
/* User requested to allow reusing listening address:port.
* Use SO_REUSEADDR on Windows and SO_REUSEPORT on most platforms.
* Fail if SO_REUSEPORT does not exist or setsockopt fails.
*/
#ifdef _WIN32
/* SO_REUSEADDR on W32 has the same semantics
as SO_REUSEPORT on BSD/Linux */
if (0 > setsockopt (socket_fd,
SOL_SOCKET,
SO_REUSEADDR,
(void*)&on, sizeof (on)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
"setsockopt failed: %s\n",
MHD_socket_last_strerr_ ());
#endif
goto free_and_fail;
}
#else
#ifndef SO_REUSEPORT
#ifdef LINUX
/* Supported since Linux 3.9, but often not present (or commented out)
in the headers at this time; but 15 is reserved for this and
thus should be safe to use. */
#define SO_REUSEPORT 15
#endif
#endif
#ifdef SO_REUSEPORT
if (0 > setsockopt (socket_fd,
SOL_SOCKET,
SO_REUSEPORT,
(void *) &on,
sizeof (on)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("setsockopt failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
goto free_and_fail;
}
#else
/* we're supposed to allow address:port re-use, but
on this platform we cannot; fail hard */
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Cannot allow listening address reuse: SO_REUSEPORT not defined\n"));
#endif
goto free_and_fail;
#endif
#endif
}
else /* if (daemon->listening_address_reuse < 0) */
{
/* User requested to disallow reusing listening address:port.
* Do nothing except for Windows where SO_EXCLUSIVEADDRUSE
* is used. Fail if it does not exist or setsockopt fails.
*/
#ifdef _WIN32
#ifdef SO_EXCLUSIVEADDRUSE
if (0 > setsockopt (socket_fd,
SOL_SOCKET,
SO_EXCLUSIVEADDRUSE,
(void *) &on,
sizeof (on)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("setsockopt failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
goto free_and_fail;
}
#else /* SO_EXCLUSIVEADDRUSE not defined on W32? */
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Cannot disallow listening address reuse: SO_EXCLUSIVEADDRUSE not defined\n"));
#endif
goto free_and_fail;
#endif
#endif /* _WIN32 */
}
/* check for user supplied sockaddr */
#if HAVE_INET6
if (0 != (flags & MHD_USE_IPv6))
addrlen = sizeof (struct sockaddr_in6);
else
#endif
addrlen = sizeof (struct sockaddr_in);
if (NULL == servaddr)
{
#if HAVE_INET6
if (0 != (flags & MHD_USE_IPv6))
{
memset (&servaddr6,
0,
sizeof (struct sockaddr_in6));
servaddr6.sin6_family = AF_INET6;
servaddr6.sin6_port = htons (port);
#if HAVE_SOCKADDR_IN_SIN_LEN
servaddr6.sin6_len = sizeof (struct sockaddr_in6);
#endif
servaddr = (struct sockaddr *) &servaddr6;
}
else
#endif
{
memset (&servaddr4,
0,
sizeof (struct sockaddr_in));
servaddr4.sin_family = AF_INET;
servaddr4.sin_port = htons (port);
#if HAVE_SOCKADDR_IN_SIN_LEN
servaddr4.sin_len = sizeof (struct sockaddr_in);
#endif
servaddr = (struct sockaddr *) &servaddr4;
}
}
daemon->socket_fd = socket_fd;
if (0 != (flags & MHD_USE_IPv6))
{
#ifdef IPPROTO_IPV6
#ifdef IPV6_V6ONLY
/* Note: "IPV6_V6ONLY" is declared by Windows Vista ff., see "IPPROTO_IPV6 Socket Options"
(http://msdn.microsoft.com/en-us/library/ms738574%28v=VS.85%29.aspx);
and may also be missing on older POSIX systems; good luck if you have any of those,
your IPv6 socket may then also bind against IPv4 anyway... */
const MHD_SCKT_OPT_BOOL_ v6_only =
(MHD_USE_DUAL_STACK != (flags & MHD_USE_DUAL_STACK));
if (0 > setsockopt (socket_fd,
IPPROTO_IPV6, IPV6_V6ONLY,
(const void *) &v6_only,
sizeof (v6_only)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("setsockopt failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
}
#endif
#endif
}
if (-1 == bind (socket_fd, servaddr, addrlen))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to bind to port %u: %s\n"),
(unsigned int) port,
MHD_socket_last_strerr_ ());
#endif
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
#ifdef TCP_FASTOPEN
if (0 != (flags & MHD_USE_TCP_FASTOPEN))
{
if (0 == daemon->fastopen_queue_size)
daemon->fastopen_queue_size = MHD_TCP_FASTOPEN_QUEUE_SIZE_DEFAULT;
if (0 != setsockopt (socket_fd,
IPPROTO_TCP,
TCP_FASTOPEN,
&daemon->fastopen_queue_size,
sizeof (daemon->fastopen_queue_size)))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("setsockopt failed: %s\n"),
MHD_socket_last_strerr_ ());
#endif
}
}
#endif
if (listen (socket_fd,
daemon->listen_backlog_size) < 0)
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to listen for connections: %s\n"),
MHD_socket_last_strerr_ ());
#endif
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
}
else
{
socket_fd = daemon->socket_fd;
}
if (!MHD_socket_nonblocking_ (socket_fd))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to set nonblocking mode on listening socket: %s\n"),
MHD_socket_last_strerr_());
#endif
if (0 != (flags & MHD_USE_EPOLL) ||
daemon->worker_pool_size > 0)
{
/* Accept must be non-blocking. Multiple children may wake up
* to handle a new connection, but only one will win the race.
* The others must immediately return. */
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
}
if ( (!MHD_SCKT_FD_FITS_FDSET_(socket_fd,
NULL)) &&
(0 == (flags & (MHD_USE_POLL | MHD_USE_EPOLL)) ) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Socket descriptor larger than FD_SETSIZE: %d > %d\n"),
socket_fd,
FD_SETSIZE);
#endif
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
#ifdef EPOLL_SUPPORT
if ( (0 != (flags & MHD_USE_EPOLL)) &&
(0 == daemon->worker_pool_size) &&
(0 == (daemon->options & MHD_USE_NO_LISTEN_SOCKET)) )
{
if (0 != (flags & MHD_USE_THREAD_PER_CONNECTION))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Combining MHD_USE_THREAD_PER_CONNECTION and MHD_USE_EPOLL is not supported.\n"));
#endif
goto free_and_fail;
}
if (MHD_YES != setup_epoll_to_listen (daemon))
goto free_and_fail;
}
#else
if (0 != (flags & MHD_USE_EPOLL))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("epoll is not supported on this platform by this build.\n"));
#endif
goto free_and_fail;
}
#endif
if (! MHD_mutex_init_ (&daemon->per_ip_connection_mutex))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD failed to initialize IP connection limit mutex\n"));
#endif
if (MHD_INVALID_SOCKET != socket_fd)
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
if (! MHD_mutex_init_ (&daemon->cleanup_connection_mutex))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD failed to initialize IP connection limit mutex\n"));
#endif
MHD_mutex_destroy_chk_ (&daemon->cleanup_connection_mutex);
if (MHD_INVALID_SOCKET != socket_fd)
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
#if HTTPS_SUPPORT
/* initialize HTTPS daemon certificate aspects & send / recv functions */
if ( (0 != (flags & MHD_USE_TLS)) &&
(0 != MHD_TLS_init (daemon)) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to initialize TLS support\n"));
#endif
if (MHD_INVALID_SOCKET != socket_fd)
MHD_socket_close_chk_ (socket_fd);
MHD_mutex_destroy_chk_ (&daemon->cleanup_connection_mutex);
MHD_mutex_destroy_chk_ (&daemon->per_ip_connection_mutex);
goto free_and_fail;
}
#endif
if ( ( (0 != (flags & MHD_USE_THREAD_PER_CONNECTION)) ||
( (0 != (flags & MHD_USE_SELECT_INTERNALLY)) &&
(0 == daemon->worker_pool_size)) ) &&
(0 == (daemon->options & MHD_USE_NO_LISTEN_SOCKET)) &&
(! MHD_create_named_thread_ (&daemon->pid,
(flags & MHD_USE_THREAD_PER_CONNECTION) ?
"MHD-listen" : "MHD-single",
daemon->thread_stack_size,
&MHD_select_thread,
daemon) ) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to create listen thread: %s\n"),
MHD_strerror_ (errno));
#endif
MHD_mutex_destroy_chk_ (&daemon->cleanup_connection_mutex);
MHD_mutex_destroy_chk_ (&daemon->per_ip_connection_mutex);
if (MHD_INVALID_SOCKET != socket_fd)
MHD_socket_close_chk_ (socket_fd);
goto free_and_fail;
}
if ( (daemon->worker_pool_size > 0) &&
(0 == (daemon->options & MHD_USE_NO_LISTEN_SOCKET)) )
{
/* Coarse-grained count of connections per thread (note error
* due to integer division). Also keep track of how many
* connections are leftover after an equal split. */
unsigned int conns_per_thread = daemon->connection_limit
/ daemon->worker_pool_size;
unsigned int leftover_conns = daemon->connection_limit
% daemon->worker_pool_size;
i = 0; /* we need this in case fcntl or malloc fails */
/* Allocate memory for pooled objects */
daemon->worker_pool = malloc (sizeof (struct MHD_Daemon)
* daemon->worker_pool_size);
if (NULL == daemon->worker_pool)
goto thread_failed;
/* Start the workers in the pool */
for (i = 0; i < daemon->worker_pool_size; ++i)
{
/* Create copy of the Daemon object for each worker */
struct MHD_Daemon *d = &daemon->worker_pool[i];
memcpy (d, daemon, sizeof (struct MHD_Daemon));
/* Adjust pooling params for worker daemons; note that memcpy()
has already copied MHD_USE_SELECT_INTERNALLY thread model into
the worker threads. */
d->master = daemon;
d->worker_pool_size = 0;
d->worker_pool = NULL;
/* Always use individual control ITCs */
if (1)
{
if (! MHD_itc_init_ (d->itc))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to create worker inter-thread communication channel: %s\n"),
MHD_itc_last_strerror_() );
#endif
goto thread_failed;
}
}
if ( (0 == (flags & (MHD_USE_POLL | MHD_USE_EPOLL))) &&
(! MHD_SCKT_FD_FITS_FDSET_(MHD_itc_r_fd_ (daemon->itc),
NULL)) )
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("File descriptor for worker inter-thread communication channel exceeds maximum value\n"));
#endif
MHD_itc_destroy_chk_ (d->itc);
goto thread_failed;
}
/* Divide available connections evenly amongst the threads.
* Thread indexes in [0, leftover_conns) each get one of the
* leftover connections. */
d->connection_limit = conns_per_thread;
if (i < leftover_conns)
++d->connection_limit;
#ifdef EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(MHD_YES != setup_epoll_to_listen (d)) )
goto thread_failed;
#endif
/* Must init cleanup connection mutex for each worker */
if (! MHD_mutex_init_ (&d->cleanup_connection_mutex))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD failed to initialize cleanup connection mutex\n"));
#endif
goto thread_failed;
}
/* Spawn the worker thread */
if (! MHD_create_named_thread_ (&d->pid,
"MHD-worker",
daemon->thread_stack_size,
&MHD_select_thread,
d))
{
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("Failed to create pool thread: %s\n"),
MHD_strerror_ (errno));
#endif
/* Free memory for this worker; cleanup below handles
* all previously-created workers. */
MHD_mutex_destroy_chk_ (&d->cleanup_connection_mutex);
goto thread_failed;
}
}
}
#if HTTPS_SUPPORT
/* API promises to never use the password after initialization,
so we additionally NULL it here to not deref a dangling pointer. */
daemon->https_key_password = NULL;
#endif /* HTTPS_SUPPORT */
return daemon;
thread_failed:
/* If no worker threads created, then shut down normally. Calling
MHD_stop_daemon (as we do below) doesn't work here since it
assumes a 0-sized thread pool means we had been in the default
MHD_USE_SELECT_INTERNALLY mode. */
if (0 == i)
{
if (MHD_INVALID_SOCKET != socket_fd)
MHD_socket_close_chk_ (socket_fd);
MHD_mutex_destroy_chk_ (&daemon->cleanup_connection_mutex);
MHD_mutex_destroy_chk_ (&daemon->per_ip_connection_mutex);
if (NULL != daemon->worker_pool)
free (daemon->worker_pool);
goto free_and_fail;
}
/* Shutdown worker threads we've already created. Pretend
as though we had fully initialized our daemon, but
with a smaller number of threads than had been
requested. */
daemon->worker_pool_size = i;
MHD_stop_daemon (daemon);
return NULL;
free_and_fail:
/* clean up basic memory state in 'daemon' and return NULL to
indicate failure */
#if HTTPS_SUPPORT
#ifdef EPOLL_SUPPORT
if (MHD_YES == daemon->upgrade_fd_in_epoll)
{
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_DEL,
daemon->epoll_upgrade_fd,
NULL))
MHD_PANIC (_("Failed to remove FD from epoll set\n"));
daemon->upgrade_fd_in_epoll = MHD_NO;
}
if (-1 != daemon->epoll_fd)
close (daemon->epoll_fd);
#if HTTPS_SUPPORT
if (-1 != daemon->epoll_upgrade_fd)
close (daemon->epoll_upgrade_fd);
#endif
#endif
#endif
#ifdef DAUTH_SUPPORT
free (daemon->nnc);
MHD_mutex_destroy_chk_ (&daemon->nnc_lock);
#endif
#if HTTPS_SUPPORT
if (0 != (flags & MHD_USE_TLS))
gnutls_priority_deinit (daemon->priority_cache);
#endif
if (MHD_ITC_IS_VALID_(daemon->itc))
MHD_itc_destroy_chk_ (daemon->itc);
free (daemon);
return NULL;
}
/**
* Close all connections for the daemon; must only be called after
* all of the threads have been joined and there is no more concurrent
* activity on the connection lists.
*
* @param daemon daemon to close down
*/
static void
close_all_connections (struct MHD_Daemon *daemon)
{
struct MHD_Connection *pos;
/* Give suspended connections a chance to resume to avoid
running into the check for there not being any suspended
connections left in case of a tight race with a recently
resumed connection. */
resume_suspended_connections (daemon);
/* first, make sure all threads are aware of shutdown; need to
traverse DLLs in peace... */
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_lock_chk_ (&daemon->cleanup_connection_mutex);
if (NULL != daemon->suspended_connections_head)
MHD_PANIC (_("MHD_stop_daemon() called while we have suspended connections.\n"));
for (pos = daemon->connections_head; NULL != pos; pos = pos->next)
{
shutdown (pos->socket_fd, SHUT_RDWR);
#if MHD_WINSOCK_SOCKETS
if ( (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) &&
(MHD_ITC_IS_VALID_(daemon->itc)) &&
(! MHD_itc_activate_ (daemon->itc, "e")) )
MHD_PANIC (_("Failed to signal shutdown via inter-thread communication channel"));
#endif
}
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
MHD_mutex_unlock_chk_ (&daemon->cleanup_connection_mutex);
/* now, collect per-connection threads */
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
pos = daemon->connections_head;
while (NULL != pos)
{
if (MHD_YES != pos->thread_joined)
{
if (! MHD_join_thread_ (pos->pid))
MHD_PANIC (_("Failed to join a thread\n"));
pos->thread_joined = MHD_YES;
/* The thread may have concurrently modified the DLL,
need to restart from the beginning */
pos = daemon->connections_head;
continue;
}
pos = pos->next;
}
}
/* now that we're alone, move everyone to cleanup */
while (NULL != (pos = daemon->connections_head))
{
if ( (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) &&
(MHD_YES != pos->thread_joined) )
MHD_PANIC (_("Failed to join a thread\n"));
close_connection (pos);
}
MHD_cleanup_connections (daemon);
}
#ifdef EPOLL_SUPPORT
/**
* Shutdown epoll()-event loop by adding write end of 'itc' to its event set.
*
* @param daemon daemon of which the epoll() instance must be signalled
*/
static void
epoll_shutdown (struct MHD_Daemon *daemon)
{
struct epoll_event event;
if (MHD_ITC_IS_INVALID_(daemon->itc))
{
/* itc was required in this mode, how could this happen? */
MHD_PANIC (_("Internal error\n"));
}
event.events = EPOLLOUT;
event.data.ptr = NULL;
if (0 != epoll_ctl (daemon->epoll_fd,
EPOLL_CTL_ADD,
MHD_itc_w_fd_ (daemon->itc),
&event))
MHD_PANIC (_("Failed to add inter-thread communication channel FD to epoll set to signal termination\n"));
}
#endif
/**
* Shutdown an HTTP daemon.
*
* @param daemon daemon to stop
* @ingroup event
*/
void
MHD_stop_daemon (struct MHD_Daemon *daemon)
{
MHD_socket fd;
unsigned int i;
#if HTTPS_SUPPORT
struct MHD_UpgradeResponseHandle *urh;
struct MHD_UpgradeResponseHandle *urhn;
#endif
if (NULL == daemon)
return;
/* give upgraded HTTPS connections a chance to finish */
#if HTTPS_SUPPORT
for (urh = daemon->urh_head; NULL != urh; urh = urhn)
{
urhn = urh->next;
/* call generic forwarding function for passing data
with chance to detect that application is done;
fake read readyness just to be sure. */
urh->mhd.celi |= MHD_EPOLL_STATE_READ_READY;
process_urh (urh);
}
#endif
if (0 != (MHD_USE_SUSPEND_RESUME & daemon->options))
resume_suspended_connections (daemon);
daemon->shutdown = MHD_YES;
fd = daemon->socket_fd;
daemon->socket_fd = MHD_INVALID_SOCKET;
/* Prepare workers for shutdown */
if (NULL != daemon->worker_pool)
{
/* #MHD_USE_NO_LISTEN_SOCKET disables thread pools, hence we need to check */
for (i = 0; i < daemon->worker_pool_size; ++i)
{
daemon->worker_pool[i].shutdown = MHD_YES;
daemon->worker_pool[i].socket_fd = MHD_INVALID_SOCKET;
#ifdef EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(-1 != daemon->worker_pool[i].epoll_fd) &&
(MHD_INVALID_SOCKET == fd) )
epoll_shutdown (&daemon->worker_pool[i]);
#endif
}
}
if (MHD_ITC_IS_VALID_(daemon->itc))
{
if (! MHD_itc_activate_ (daemon->itc, "e"))
MHD_PANIC (_("Failed to signal shutdown via inter-thread communication channel"));
}
#ifdef HAVE_LISTEN_SHUTDOWN
else
{
/* fd might be MHD_INVALID_SOCKET here due to 'MHD_quiesce_daemon' */
if ( (MHD_INVALID_SOCKET != fd) &&
(0 == (daemon->options & MHD_USE_ITC)) )
(void) shutdown (fd,
SHUT_RDWR);
}
#endif
#ifdef EPOLL_SUPPORT
if ( (0 != (daemon->options & MHD_USE_EPOLL)) &&
(-1 != daemon->epoll_fd) &&
(MHD_INVALID_SOCKET == fd) )
epoll_shutdown (daemon);
#endif
#if DEBUG_CLOSE
#ifdef HAVE_MESSAGES
MHD_DLOG (daemon,
_("MHD listen socket shutdown\n"));
#endif
#endif
/* Signal workers to stop and clean them up */
if (NULL != daemon->worker_pool)
{
/* MHD_USE_NO_LISTEN_SOCKET disables thread pools, hence we need to check */
for (i = 0; i < daemon->worker_pool_size; ++i)
{
if (MHD_ITC_IS_VALID_(daemon->worker_pool[i].itc))
{
if (! MHD_itc_activate_ (daemon->worker_pool[i].itc, "e"))
MHD_PANIC
|