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|
/*
This file is part of libmicrohttpd
(C) 2007 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 daemon.c
* @brief A minimal-HTTP server library
* @author Daniel Pittman
* @author Christian Grothoff
*/
#include "internal.h"
#include "response.h"
#include "connection.h"
#include "memorypool.h"
/**
* Default connection limit.
*/
#define MHD_MAX_CONNECTIONS_DEFAULT FD_SETSIZE -4
/**
* Default memory allowed per connection.
*/
#define MHD_POOL_SIZE_DEFAULT (1024 * 1024)
/**
* Print extra messages with reasons for closing
* sockets? (only adds non-error messages).
*/
#define DEBUG_CLOSE 0
/**
* Register an access handler for all URIs beginning with uri_prefix.
*
* @param uri_prefix
* @return MRI_NO if a handler for this exact prefix
* already exists
*/
int
MHD_register_handler (struct MHD_Daemon *daemon,
const char *uri_prefix,
MHD_AccessHandlerCallback dh, void *dh_cls)
{
struct MHD_Access_Handler *ah;
if ((daemon == NULL) || (uri_prefix == NULL) || (dh == NULL))
return MHD_NO;
ah = daemon->handlers;
while (ah != NULL)
{
if (0 == strcmp (uri_prefix, ah->uri_prefix))
return MHD_NO;
ah = ah->next;
}
ah = malloc (sizeof (struct MHD_Access_Handler));
if (ah == NULL)
{
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Error allocating memory: %s\n", STRERROR (errno));
#endif
return MHD_NO;
}
ah->next = daemon->handlers;
ah->uri_prefix = strdup (uri_prefix);
ah->dh = dh;
ah->dh_cls = dh_cls;
daemon->handlers = ah;
return MHD_YES;
}
/**
* Unregister an access handler for the URIs beginning with
* uri_prefix.
*
* @param uri_prefix
* @return MHD_NO if a handler for this exact prefix
* is not known for this daemon
*/
int
MHD_unregister_handler (struct MHD_Daemon *daemon,
const char *uri_prefix,
MHD_AccessHandlerCallback dh, void *dh_cls)
{
struct MHD_Access_Handler *prev;
struct MHD_Access_Handler *pos;
if ((daemon == NULL) || (uri_prefix == NULL) || (dh == NULL))
return MHD_NO;
pos = daemon->handlers;
prev = NULL;
while (pos != NULL)
{
if ((dh == pos->dh) &&
(dh_cls == pos->dh_cls) &&
(0 == strcmp (uri_prefix, pos->uri_prefix)))
{
if (prev == NULL)
daemon->handlers = pos->next;
else
prev->next = pos->next;
free (pos);
return MHD_YES;
}
prev = pos;
pos = pos->next;
}
return MHD_NO;
}
/**
* Obtain the select sets for this daemon.
*
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int
MHD_get_fdset (struct MHD_Daemon *daemon,
fd_set * read_fd_set,
fd_set * write_fd_set, fd_set * except_fd_set, int *max_fd)
{
struct MHD_Connection *pos;
int fd;
if ((daemon == NULL) ||
(read_fd_set == NULL) ||
(write_fd_set == NULL) ||
(except_fd_set == NULL) ||
(max_fd == NULL) ||
(-1 == (fd = daemon->socket_fd)) ||
(daemon->shutdown == MHD_YES) ||
((daemon->options & MHD_USE_THREAD_PER_CONNECTION) != 0))
return MHD_NO;
FD_SET (fd, read_fd_set);
if ((*max_fd) < fd)
*max_fd = fd;
pos = daemon->connections;
while (pos != NULL)
{
if (MHD_YES != MHD_connection_get_fdset (pos,
read_fd_set,
write_fd_set,
except_fd_set, max_fd))
return MHD_NO;
pos = pos->next;
}
return MHD_YES;
}
/**
* Main function of the thread that handles an individual
* connection.
*/
static void *
MHD_handle_connection (void *data)
{
struct MHD_Connection *con = data;
int num_ready;
fd_set rs;
fd_set ws;
fd_set es;
int max;
struct timeval tv;
unsigned int timeout;
time_t now;
if (con == NULL)
abort ();
timeout = con->daemon->connection_timeout;
now = time (NULL);
while ((!con->daemon->shutdown) &&
(con->socket_fd != -1) &&
((timeout == 0) || (now - timeout > con->last_activity)))
{
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
max = 0;
MHD_connection_get_fdset (con, &rs, &ws, &es, &max);
tv.tv_usec = 0;
tv.tv_sec = timeout - (now - con->last_activity);
num_ready = SELECT (max + 1,
&rs, &ws, &es, (timeout != 0) ? &tv : NULL);
now = time (NULL);
if (num_ready < 0)
{
if (errno == EINTR)
continue;
#if HAVE_MESSAGES
MHD_DLOG (con->daemon, "Error during select (%d): `%s'\n",
max, STRERROR (errno));
#endif
break;
}
if (((FD_ISSET (con->socket_fd, &rs)) &&
(MHD_YES != MHD_connection_handle_read (con))) ||
((con->socket_fd != -1) &&
(FD_ISSET (con->socket_fd, &ws)) &&
(MHD_YES != MHD_connection_handle_write (con))))
break;
if ((con->headersReceived == MHD_YES) && (con->response == NULL))
MHD_call_connection_handler (con);
if ((con->socket_fd != -1) &&
((FD_ISSET (con->socket_fd, &rs)) ||
(FD_ISSET (con->socket_fd, &ws))))
con->last_activity = now;
}
if (con->socket_fd != -1)
{
#if DEBUG_CLOSE
#if HAVE_MESSAGES
MHD_DLOG (con->daemon,
"Processing thread terminating, closing connection\n");
#endif
#endif
SHUTDOWN (con->socket_fd, SHUT_RDWR);
CLOSE (con->socket_fd);
con->socket_fd = -1;
}
return NULL;
}
/**
* 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.
*/
static int
MHD_accept_connection (struct MHD_Daemon *daemon)
{
struct MHD_Connection *connection;
struct sockaddr_in6 addr6;
struct sockaddr *addr = (struct sockaddr *) &addr6;
socklen_t addrlen;
int s;
#if OSX
static int on=1;
#endif
if (sizeof (struct sockaddr) > sizeof (struct sockaddr_in6))
abort (); /* fatal, serious error */
addrlen = sizeof (struct sockaddr_in6);
memset (addr, 0, sizeof (struct sockaddr_in6));
s = ACCEPT (daemon->socket_fd, addr, &addrlen);
if ((s < 0) || (addrlen <= 0))
{
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Error accepting connection: %s\n", STRERROR (errno));
#endif
if (s != -1)
{
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s); /* just in case */
}
return MHD_NO;
}
if (daemon->max_connections == 0)
{
/* above connection limit - reject */
#if HAVE_MESSAGES
MHD_DLOG (daemon,
"Server reached connection limit (closing inbound connection)\n");
#endif
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s);
return MHD_NO;
}
if ((daemon->apc != NULL) &&
(MHD_NO == daemon->apc (daemon->apc_cls, addr, addrlen)))
{
#if DEBUG_CLOSE
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Connection rejected, closing connection\n");
#endif
#endif
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s);
return MHD_YES;
}
#if OSX
#ifdef SOL_SOCKET
#ifdef SO_NOSIGPIPE
setsockopt(s,
SOL_SOCKET,
SO_NOSIGPIPE,
&on,
sizeof(on));
#endif
#endif
#endif
connection = malloc (sizeof (struct MHD_Connection));
if (connection == NULL)
{
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Error allocating memory: %s\n", STRERROR (errno));
#endif
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s);
return MHD_NO;
}
memset (connection, 0, sizeof (struct MHD_Connection));
connection->pool = NULL;
connection->addr = malloc (addrlen);
if (connection->addr == NULL)
{
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Error allocating memory: %s\n", STRERROR (errno));
#endif
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s);
free (connection);
return MHD_NO;
}
memcpy (connection->addr, addr, addrlen);
connection->addr_len = addrlen;
connection->socket_fd = s;
connection->daemon = daemon;
if ((0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) &&
(0 != pthread_create (&connection->pid,
NULL, &MHD_handle_connection, connection)))
{
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Failed to create a thread: %s\n", STRERROR (errno));
#endif
SHUTDOWN (s, SHUT_RDWR);
CLOSE (s);
free (connection->addr);
free (connection);
return MHD_NO;
}
connection->last_activity = time (NULL);
connection->next = daemon->connections;
daemon->connections = connection;
daemon->max_connections--;
return MHD_YES;
}
/**
* Free resources associated with all closed connections.
* (destroy responses, free buffers, etc.). A connection
* is known to be closed if the socket_fd is -1.
*
* Also performs connection actions that need to be run
* even if the connection is not selectable (such as
* calling the application again with upload data when
* the upload data buffer is full).
*/
static void
MHD_cleanup_connections (struct MHD_Daemon *daemon)
{
struct MHD_Connection *pos;
struct MHD_Connection *prev;
void *unused;
time_t timeout;
timeout = time (NULL);
if (daemon->connection_timeout != 0)
timeout -= daemon->connection_timeout;
else
timeout = 0;
pos = daemon->connections;
prev = NULL;
while (pos != NULL)
{
if ((pos->last_activity < timeout) && (pos->socket_fd != -1))
{
#if DEBUG_CLOSE
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Connection timed out, closing connection\n");
#endif
#endif
SHUTDOWN (pos->socket_fd, SHUT_RDWR);
CLOSE (pos->socket_fd);
pos->socket_fd = -1;
if (pos->daemon->notify_completed != NULL)
pos->daemon->notify_completed (pos->daemon->notify_completed_cls,
pos,
&pos->client_context,
MHD_REQUEST_TERMINATED_TIMEOUT_REACHED);
}
if (pos->socket_fd == -1)
{
if (prev == NULL)
daemon->connections = pos->next;
else
prev->next = pos->next;
if (0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
pthread_kill (pos->pid, SIGALRM);
pthread_join (pos->pid, &unused);
}
if (pos->response != NULL)
MHD_destroy_response (pos->response);
MHD_pool_destroy (pos->pool);
free (pos->addr);
free (pos);
daemon->max_connections++;
if (prev == NULL)
pos = daemon->connections;
else
pos = prev->next;
continue;
}
if ((pos->headersReceived == MHD_YES) && (pos->response == NULL))
MHD_call_connection_handler (pos);
prev = pos;
pos = pos->next;
}
}
/**
* Obtain timeout value for select for this daemon
* (only needed if connection timeout is used). The
* returned value is how long select should at most
* block, not the timeout value set for connections.
*
* @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
* necessiate the use of a timeout right now).
*/
int
MHD_get_timeout (struct MHD_Daemon *daemon, unsigned long long *timeout)
{
time_t earliest_deadline;
time_t now;
struct MHD_Connection *pos;
unsigned int dto;
dto = daemon->connection_timeout;
if (0 == dto)
return MHD_NO;
pos = daemon->connections;
if (pos == NULL)
return MHD_NO; /* no connections */
now = time (NULL);
/* start with conservative estimate */
earliest_deadline = now + dto;
while (pos != NULL)
{
if (earliest_deadline > pos->last_activity + dto)
earliest_deadline = pos->last_activity + dto;
pos = pos->next;
}
if (earliest_deadline < now)
*timeout = 0;
else
*timeout = (earliest_deadline - now);
return MHD_YES;
}
/**
* Main select call.
*
* @param may_block YES if blocking, 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)
{
struct MHD_Connection *pos;
int num_ready;
fd_set rs;
fd_set ws;
fd_set es;
int max;
struct timeval timeout;
unsigned long long ltimeout;
int ds;
time_t now;
timeout.tv_sec = 0;
timeout.tv_usec = 0;
if (daemon == NULL)
abort ();
if (daemon->shutdown == MHD_YES)
return MHD_NO;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
max = 0;
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
/* single-threaded, go over everything */
if (MHD_NO == MHD_get_fdset (daemon, &rs, &ws, &es, &max))
return MHD_NO;
}
else
{
/* accept only, have one thread per connection */
max = daemon->socket_fd;
if (max == -1)
return MHD_NO;
FD_SET (max, &rs);
}
if (may_block == MHD_NO)
{
timeout.tv_usec = 0;
timeout.tv_sec = 0;
}
else
{
/* ltimeout is in ms */
if (MHD_YES == MHD_get_timeout (daemon, <imeout))
{
timeout.tv_usec = (ltimeout % 1000) * 1000;
timeout.tv_sec = ltimeout / 1000;
may_block = MHD_NO;
}
}
num_ready = SELECT (max + 1,
&rs, &ws, &es, may_block == MHD_NO ? &timeout : NULL);
if (daemon->shutdown == MHD_YES)
return MHD_NO;
if (num_ready < 0)
{
if (errno == EINTR)
return MHD_YES;
#if HAVE_MESSAGES
MHD_DLOG (daemon, "Select failed: %s\n", STRERROR (errno));
#endif
return MHD_NO;
}
ds = daemon->socket_fd;
if (ds == -1)
return MHD_YES;
if (FD_ISSET (ds, &rs))
MHD_accept_connection (daemon);
if (0 == (daemon->options & MHD_USE_THREAD_PER_CONNECTION))
{
/* do not have a thread per connection, process all connections now */
now = time (NULL);
pos = daemon->connections;
while (pos != NULL)
{
ds = pos->socket_fd;
if (ds != -1)
{
if (FD_ISSET (ds, &rs))
{
pos->last_activity = now;
MHD_connection_handle_read (pos);
}
if (FD_ISSET (ds, &ws))
{
pos->last_activity = now;
MHD_connection_handle_write (pos);
}
}
pos = pos->next;
}
}
return MHD_YES;
}
/**
* 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.
*
* @return MHD_YES on success, MHD_NO if this
* daemon was not started with the right
* options for this call.
*/
int
MHD_run (struct MHD_Daemon *daemon)
{
if ((daemon->shutdown != MHD_NO) ||
(0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
(0 != (daemon->options & MHD_USE_SELECT_INTERNALLY)))
return MHD_NO;
MHD_select (daemon, MHD_NO);
MHD_cleanup_connections (daemon);
return MHD_YES;
}
/**
* Thread that runs the select loop until the daemon
* is explicitly shut down.
*/
static void *
MHD_select_thread (void *cls)
{
struct MHD_Daemon *daemon = cls;
while (daemon->shutdown == MHD_NO)
{
MHD_select (daemon, MHD_YES);
MHD_cleanup_connections (daemon);
}
return NULL;
}
/**
* Start a webserver on the given port.
*
* @param port port to bind to
* @param apc callback to call to check which clients
* will be allowed to connect
* @param apc_cls extra argument to apc
* @param dh default handler for all URIs
* @param dh_cls extra argument to dh
* @return NULL on error, handle to daemon on success
*/
struct MHD_Daemon *
MHD_start_daemon (unsigned int options,
unsigned short port,
MHD_AcceptPolicyCallback apc,
void *apc_cls,
MHD_AccessHandlerCallback dh, void *dh_cls, ...)
{
const int on = 1;
struct MHD_Daemon *retVal;
int socket_fd;
struct sockaddr_in servaddr4;
struct sockaddr_in6 servaddr6;
const struct sockaddr *servaddr;
socklen_t addrlen;
va_list ap;
enum MHD_OPTION opt;
if ((options & MHD_USE_SSL) != 0)
return NULL;
if ((port == 0) || (dh == NULL))
return NULL;
if ((options & MHD_USE_IPv6) != 0)
socket_fd = SOCKET (PF_INET6, SOCK_STREAM, 0);
else
socket_fd = SOCKET (PF_INET, SOCK_STREAM, 0);
if (socket_fd < 0)
{
#if HAVE_MESSAGES
if ((options & MHD_USE_DEBUG) != 0)
fprintf (stderr, "Call to socket failed: %s\n", STRERROR (errno));
#endif
return NULL;
}
if ((SETSOCKOPT (socket_fd,
SOL_SOCKET,
SO_REUSEADDR,
&on, sizeof (on)) < 0) && (options & MHD_USE_DEBUG) != 0) {
#if HAVE_MESSAGES
fprintf (stderr, "setsockopt failed: %s\n", STRERROR (errno));
#endif
}
if ((options & MHD_USE_IPv6) != 0)
{
memset (&servaddr6, 0, sizeof (struct sockaddr_in6));
servaddr6.sin6_family = AF_INET6;
servaddr6.sin6_port = htons (port);
servaddr = (struct sockaddr *) &servaddr6;
addrlen = sizeof (struct sockaddr_in6);
}
else
{
memset (&servaddr4, 0, sizeof (struct sockaddr_in));
servaddr4.sin_family = AF_INET;
servaddr4.sin_port = htons (port);
servaddr = (struct sockaddr *) &servaddr4;
addrlen = sizeof (struct sockaddr_in);
}
if (BIND (socket_fd, servaddr, addrlen) < 0)
{
#if HAVE_MESSAGES
if ((options & MHD_USE_DEBUG) != 0)
fprintf (stderr,
"Failed to bind to port %u: %s\n", port, STRERROR (errno));
#endif
CLOSE (socket_fd);
return NULL;
}
if (LISTEN (socket_fd, 20) < 0)
{
#if HAVE_MESSAGES
if ((options & MHD_USE_DEBUG) != 0)
fprintf (stderr,
"Failed to listen for connections: %s\n", STRERROR (errno));
#endif
CLOSE (socket_fd);
return NULL;
}
retVal = malloc (sizeof (struct MHD_Daemon));
memset (retVal, 0, sizeof (struct MHD_Daemon));
retVal->options = options;
retVal->port = port;
retVal->apc = apc;
retVal->apc_cls = apc_cls;
retVal->socket_fd = socket_fd;
retVal->default_handler.dh = dh;
retVal->default_handler.dh_cls = dh_cls;
retVal->default_handler.uri_prefix = "";
retVal->default_handler.next = NULL;
retVal->max_connections = MHD_MAX_CONNECTIONS_DEFAULT;
retVal->pool_size = MHD_POOL_SIZE_DEFAULT;
retVal->connection_timeout = 0; /* no timeout */
va_start (ap, dh_cls);
while (MHD_OPTION_END != (opt = va_arg (ap, enum MHD_OPTION)))
{
switch (opt)
{
case MHD_OPTION_CONNECTION_MEMORY_LIMIT:
retVal->pool_size = va_arg (ap, unsigned int);
break;
case MHD_OPTION_CONNECTION_LIMIT:
retVal->max_connections = va_arg (ap, unsigned int);
break;
case MHD_OPTION_CONNECTION_TIMEOUT:
retVal->connection_timeout = va_arg (ap, unsigned int);
break;
case MHD_OPTION_NOTIFY_COMPLETED:
retVal->notify_completed =
va_arg (ap, MHD_RequestCompletedCallback);
retVal->notify_completed_cls = va_arg (ap, void *);
break;
default:
#if HAVE_MESSAGES
fprintf (stderr,
"Invalid MHD_OPTION argument! (Did you terminate the list with MHD_OPTION_END?)\n");
#endif
abort ();
}
}
va_end (ap);
if (((0 != (options & MHD_USE_THREAD_PER_CONNECTION)) ||
(0 != (options & MHD_USE_SELECT_INTERNALLY))) &&
(0 != pthread_create (&retVal->pid, NULL, &MHD_select_thread, retVal)))
{
#if HAVE_MESSAGES
MHD_DLOG (retVal,
"Failed to create listen thread: %s\n", STRERROR (errno));
#endif
free (retVal);
CLOSE (socket_fd);
return NULL;
}
return retVal;
}
/**
* Shutdown an http daemon.
*/
void
MHD_stop_daemon (struct MHD_Daemon *daemon)
{
void *unused;
int fd;
if (daemon == NULL)
return;
daemon->shutdown = MHD_YES;
fd = daemon->socket_fd;
daemon->socket_fd = -1;
#if DEBUG_CLOSE
#if HAVE_MESSAGES
MHD_DLOG (daemon, "MHD shutdown, closing listen socket\n");
#endif
#endif
CLOSE (fd);
if ((0 != (daemon->options & MHD_USE_THREAD_PER_CONNECTION)) ||
(0 != (daemon->options & MHD_USE_SELECT_INTERNALLY)))
{
pthread_kill (daemon->pid, SIGALRM);
pthread_join (daemon->pid, &unused);
}
while (daemon->connections != NULL)
{
if (-1 != daemon->connections->socket_fd)
{
#if DEBUG_CLOSE
#if HAVE_MESSAGES
MHD_DLOG (daemon, "MHD shutdown, closing active connections\n");
#endif
#endif
if (daemon->notify_completed != NULL)
daemon->notify_completed (daemon->notify_completed_cls,
daemon->connections,
&daemon->connections->client_context,
MHD_REQUEST_TERMINATED_DAEMON_SHUTDOWN);
SHUTDOWN (daemon->connections->socket_fd, SHUT_RDWR);
CLOSE (daemon->connections->socket_fd);
daemon->connections->socket_fd = -1;
}
MHD_cleanup_connections (daemon);
}
free (daemon);
}
#ifndef WINDOWS
static struct sigaction sig;
static struct sigaction old;
static void
sigalrmHandler (int sig)
{
}
/**
* Initialize the signal handler for SIGALRM.
*/
void __attribute__ ((constructor)) MHD_pthread_handlers_ltdl_init ()
{
/* make sure SIGALRM does not kill us */
memset (&sig, 0, sizeof (struct sigaction));
memset (&old, 0, sizeof (struct sigaction));
sig.sa_flags = SA_NODEFER;
sig.sa_handler = &sigalrmHandler;
sigaction (SIGALRM, &sig, &old);
}
void __attribute__ ((destructor)) MHD_pthread_handlers_ltdl_fini ()
{
sigaction (SIGALRM, &old, &sig);
}
#else
void __attribute__ ((constructor)) MHD_win_ltdl_init ()
{
plibc_init ("CRISP", "libmicrohttpd");
}
void __attribute__ ((destructor)) MHD_win_ltdl_fini ()
{
plibc_shutdown ();
}
#endif
/* end of daemon.c */
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