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authorChristian Grothoff <christian@grothoff.org>2018-11-08 11:32:03 +0100
committerChristian Grothoff <christian@grothoff.org>2018-11-08 11:32:03 +0100
commita18d1f2587ca5df5a9c6e47c012bfbaf3f19098c (patch)
tree890025fef864f380c9d2ca40599f52e0e60b1c14 /src/transport/gnunet-communicator-unix.c
parent49b581dd1c00d769e97031c51b5865846e802f8f (diff)
work on UNIX communicator
Diffstat (limited to 'src/transport/gnunet-communicator-unix.c')
-rw-r--r--src/transport/gnunet-communicator-unix.c1072
1 files changed, 314 insertions, 758 deletions
diff --git a/src/transport/gnunet-communicator-unix.c b/src/transport/gnunet-communicator-unix.c
index 373b74149..f07975186 100644
--- a/src/transport/gnunet-communicator-unix.c
+++ b/src/transport/gnunet-communicator-unix.c
@@ -31,6 +31,16 @@
#include "gnunet_transport_communication_service.h"
/**
+ * How many messages do we keep at most in the queue to the
+ * transport service before we start to drop (default,
+ * can be changed via the configuration file).
+ * Should be _below_ the level of the communicator API, as
+ * otherwise we may read messages just to have them dropped
+ * by the communicator API.
+ */
+#define DEFAULT_MAX_QUEUE_LENGTH 8
+
+/**
* Name of the communicator.
*/
#define COMMUNICATOR_NAME "unix"
@@ -59,63 +69,6 @@ GNUNET_NETWORK_STRUCT_END
/**
- * Information we track for a message awaiting transmission.
- */
-struct UNIXMessageWrapper
-{
- /**
- * We keep messages in a doubly linked list.
- */
- struct UNIXMessageWrapper *next;
-
- /**
- * We keep messages in a doubly linked list.
- */
- struct UNIXMessageWrapper *prev;
-
- /**
- * The actual payload (allocated separately right now).
- */
- struct UNIXMessage *msg;
-
- /**
- * Queue this message belongs to.
- */
- struct Queue *queue;
-
- /**
- * Function to call upon transmission.
- */
- GNUNET_TRANSPORT_TransmitContinuation cont;
-
- /**
- * Closure for @e cont.
- */
- void *cont_cls;
-
- /**
- * Timeout for this message.
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * Number of bytes in @e msg.
- */
- size_t msgsize;
-
- /**
- * Number of bytes of payload encapsulated in @e msg.
- */
- size_t payload;
-
- /**
- * Priority of the message (ignored, just dragged along in UNIX).
- */
- unsigned int priority;
-};
-
-
-/**
* Handle for a queue.
*/
struct Queue
@@ -132,10 +85,7 @@ struct Queue
struct Queue *prev;
/**
- * To whom are we talking to (set to our identity
- * if we are still waiting for the welcome message).
- *
- * FIXME: information duplicated with 'peer' in address!
+ * To whom are we talking to.
*/
struct GNUNET_PeerIdentity target;
@@ -150,6 +100,12 @@ struct Queue
socklen_t address_len;
/**
+ * Message currently scheduled for transmission, non-NULL if and only
+ * if this queue is in the #queue_head DLL.
+ */
+ const struct GNUNET_MessageHeader *msg;
+
+ /**
* Message queue we are providing for the #ch.
*/
struct GNUNET_MQ_Handle *mq;
@@ -172,17 +128,11 @@ struct Queue
/**
* Queue timeout task.
*/
- struct GNUNET_SCHEDULER_Task * timeout_task;
-
- /**
- * Number of messages we currently have in our write queue.
- */
- unsigned int msgs_in_queue;
+ struct GNUNET_SCHEDULER_Task *timeout_task;
};
-
/**
* ID of read task
*/
@@ -194,9 +144,14 @@ static struct GNUNET_SCHEDULER_Task *read_task;
static struct GNUNET_SCHEDULER_Task *write_task;
/**
- * Number of bytes we currently have in our write queues.
+ * Number of messages we currently have in our queues towards the transport service.
*/
-static unsigned long long bytes_in_queue;
+static unsigned long long delivering_messages;
+
+/**
+ * Maximum queue length before we stop reading towards the transport service.
+ */
+static unsigned long long max_queue_length;
/**
* Our environment.
@@ -211,12 +166,12 @@ static struct GNUNET_CONTAINER_MultiPeerMap *queue_map;
/**
* Head of queue of messages to transmit.
*/
-static struct UNIXMessageWrapper *msg_head;
+static struct Queue *queue_head;
/**
* Tail of queue of messages to transmit.
*/
-static struct UNIXMessageWrapper *msg_tail;
+static struct Queue *queue_tail;
/**
* socket that we transmit all data with
@@ -230,101 +185,6 @@ static struct GNUNET_TRANSPORT_AddressIdentifier *ai;
/**
- * If a queue monitor is attached, notify it about the new
- * queue state.
- *
- * @param plugin our plugin
- * @param queue queue that changed state
- * @param state new state of the queue
- */
-static void
-notify_queue_monitor (struct Plugin *plugin,
- struct Queue *queue,
- enum GNUNET_TRANSPORT_QueueState state)
-{
- struct GNUNET_TRANSPORT_QueueInfo info;
-
- if (NULL == plugin->sic)
- return;
- memset (&info, 0, sizeof (info));
- info.state = state;
- info.is_inbound = GNUNET_SYSERR; /* hard to say */
- info.num_msg_pending = queue->msgs_in_queue;
- info.num_bytes_pending = queue->bytes_in_queue;
- /* info.receive_delay remains zero as this is not supported by UNIX
- (cannot selectively not receive from 'some' peer while continuing
- to receive from others) */
- info.queue_timeout = queue->timeout;
- info.address = queue->address;
- plugin->sic (plugin->sic_cls,
- queue,
- &info);
-}
-
-
-/**
- * Function called for a quick conversion of the binary address to
- * a numeric address. Note that the caller must not free the
- * address and that the next call to this function is allowed
- * to override the address again.
- *
- * @param cls closure
- * @param addr binary address
- * @param addrlen length of the @a addr
- * @return string representing the same address
- */
-static const char *
-unix_plugin_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
-{
- static char rbuf[1024];
- struct UnixAddress *ua = (struct UnixAddress *) addr;
- char *addrstr;
- size_t addr_str_len;
- unsigned int off;
-
- if ((NULL == addr) || (sizeof (struct UnixAddress) > addrlen))
- {
- GNUNET_break(0);
- return NULL;
- }
- addrstr = (char *) &ua[1];
- addr_str_len = ntohl (ua->addrlen);
-
- if (addr_str_len != addrlen - sizeof(struct UnixAddress))
- {
- GNUNET_break(0);
- return NULL;
- }
- if ('\0' != addrstr[addr_str_len - 1])
- {
- GNUNET_break(0);
- return NULL;
- }
- if (strlen (addrstr) + 1 != addr_str_len)
- {
- GNUNET_break(0);
- return NULL;
- }
-
- off = 0;
- if ('\0' == addrstr[0])
- off++;
- memset (rbuf, 0, sizeof (rbuf));
- GNUNET_snprintf (rbuf,
- sizeof (rbuf) - 1,
- "%s.%u.%s%.*s",
- PLUGIN_NAME,
- ntohl (ua->options),
- (off == 1) ? "@" : "",
- (int) (addr_str_len - off),
- &addrstr[off]);
- return rbuf;
-}
-
-
-/**
* Functions with this signature are called whenever we need
* to close a queue due to a disconnect or failure to
* establish a connection.
@@ -332,58 +192,40 @@ unix_plugin_address_to_string (void *cls,
* @param queue queue to close down
*/
static void
-unix_plugin_queue_disconnect (struct Queue *queue)
+queue_destroy (struct Queue *queue)
{
struct Plugin *plugin = cls;
- struct UNIXMessageWrapper *msgw;
- struct UNIXMessageWrapper *next;
+ struct GNUNET_MQ_Handle *mq;
LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting queue for peer `%s'\n",
+ "Disconnecting queue for peer `%s'\n",
GNUNET_i2s (&queue->target));
- plugin->env->queue_end (plugin->env->cls,
- queue->address,
- queue);
- next = plugin->msg_head;
- while (NULL != next)
+ if (0 != queue->bytes_in_queue)
{
- msgw = next;
- next = msgw->next;
- if (msgw->queue != queue)
- continue;
- GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
- plugin->msg_tail,
- msgw);
- queue->msgs_in_queue--;
- GNUNET_assert (queue->bytes_in_queue >= msgw->msgsize);
- queue->bytes_in_queue -= msgw->msgsize;
- GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
- plugin->bytes_in_queue -= msgw->msgsize;
- if (NULL != msgw->cont)
- msgw->cont (msgw->cont_cls,
- &msgw->queue->target,
- GNUNET_SYSERR,
- msgw->payload, 0);
- GNUNET_free (msgw->msg);
- GNUNET_free (msgw);
+ GNUNET_CONTAINER_DLL_remove (queue_head,
+ queue_tail,
+ queue);
+ queue->bytes_in_queue = 0;
+ }
+ if (NULL != (mq = queue->mq))
+ {
+ queue->mq = NULL;
+ GNUNET_MQ_destroy (mq);
}
GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multipeermap_remove (plugin->queue_map,
+ GNUNET_CONTAINER_multipeermap_remove (queue_map,
&queue->target,
queue));
GNUNET_STATISTICS_set (stats,
"# UNIX queues active",
- GNUNET_CONTAINER_multipeermap_size (plugin->queue_map),
+ GNUNET_CONTAINER_multipeermap_size (queue_map),
GNUNET_NO);
if (NULL != queue->timeout_task)
{
GNUNET_SCHEDULER_cancel (queue->timeout_task);
queue->timeout_task = NULL;
- queue->timeout = GNUNET_TIME_UNIT_ZERO_ABS;
}
GNUNET_free (queue->address);
- GNUNET_break (0 == queue->bytes_in_queue);
- GNUNET_break (0 == queue->msgs_in_queue);
GNUNET_free (queue);
}
@@ -416,7 +258,7 @@ queue_timeout (void *cls)
queue,
GNUNET_STRINGS_relative_time_to_string (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
GNUNET_YES));
- unix_plugin_queue_disconnect (queue);
+ queue_destroy (queue);
}
@@ -458,7 +300,9 @@ unix_address_to_sockaddr (const char *unixpath,
slen = strlen (unixpath);
if (slen >= sizeof (un->sun_path))
slen = sizeof (un->sun_path) - 1;
- GNUNET_memcpy (un->sun_path, unixpath, slen);
+ GNUNET_memcpy (un->sun_path,
+ unixpath,
+ slen);
un->sun_path[slen] = '\0';
slen = sizeof (struct sockaddr_un);
#if HAVE_SOCKADDR_UN_SUN_LEN
@@ -545,182 +389,19 @@ lookup_queue (const struct GNUNET_PeerIdentity *peer,
}
-
-/**
- * Actually send out the message, assume we've got the address and
- * send_handle squared away!
- *
- * @param cls closure
- * @param send_handle which handle to send message on
- * @param target who should receive this message (ignored by UNIX)
- * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
- * @param msgbuf_size the size of the @a msgbuf to send
- * @param priority how important is the message (ignored by UNIX)
- * @param timeout when should we time out (give up) if we can not transmit?
- * @param addr the addr to send the message to, needs to be a sockaddr for us
- * @param addrlen the len of @a addr
- * @param payload bytes payload to send
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...)
- * @param cont_cls closure for @a cont
- * @return on success the number of bytes written, RETRY for retry, -1 on errors
- */
-static ssize_t
-unix_real_send (void *cls,
- struct GNUNET_NETWORK_Handle *send_handle,
- const struct GNUNET_PeerIdentity *target,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Absolute timeout,
- const struct UnixAddress *addr,
- size_t addrlen,
- size_t payload,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
-{
- struct Plugin *plugin = cls;
- ssize_t sent;
- struct sockaddr_un *un;
- socklen_t un_len;
- const char *unixpath;
-
- if (NULL == send_handle)
- {
- GNUNET_break (0); /* We do not have a send handle */
- return GNUNET_SYSERR;
- }
- if ((NULL == addr) || (0 == addrlen))
- {
- GNUNET_break (0); /* Can never send if we don't have an address */
- return GNUNET_SYSERR;
- }
-
- /* Prepare address */
- unixpath = (const char *) &addr[1];
- if (NULL == (un = unix_address_to_sockaddr (unixpath,
- &un_len)))
- {
- GNUNET_break (0);
- return -1;
- }
-
- if ((GNUNET_YES == plugin->is_abstract) &&
- (0 != (UNIX_OPTIONS_USE_ABSTRACT_SOCKETS & ntohl(addr->options) )) )
- {
- un->sun_path[0] = '\0';
- }
-resend:
- /* Send the data */
- sent = GNUNET_NETWORK_socket_sendto (send_handle,
- msgbuf,
- msgbuf_size,
- (const struct sockaddr *) un,
- un_len);
- if (GNUNET_SYSERR == sent)
- {
- if ( (EAGAIN == errno) ||
- (ENOBUFS == errno) )
- {
- GNUNET_free (un);
- return RETRY; /* We have to retry later */
- }
- if (EMSGSIZE == errno)
- {
- socklen_t size = 0;
- socklen_t len = sizeof (size);
-
- GNUNET_NETWORK_socket_getsockopt ((struct GNUNET_NETWORK_Handle *)
- send_handle, SOL_SOCKET, SO_SNDBUF, &size,
- &len);
- if (size < msgbuf_size)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Trying to increase socket buffer size from %u to %u for message size %u\n",
- (unsigned int) size,
- (unsigned int) ((msgbuf_size / 1000) + 2) * 1000,
- (unsigned int) msgbuf_size);
- size = ((msgbuf_size / 1000) + 2) * 1000;
- if (GNUNET_OK ==
- GNUNET_NETWORK_socket_setsockopt ((struct GNUNET_NETWORK_Handle *) send_handle,
- SOL_SOCKET, SO_SNDBUF,
- &size, sizeof (size)))
- goto resend; /* Increased buffer size, retry sending */
- else
- {
- /* Could not increase buffer size: error, no retry */
- GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "setsockopt");
- GNUNET_free (un);
- return GNUNET_SYSERR;
- }
- }
- else
- {
- /* Buffer is bigger than message: error, no retry
- * This should never happen!*/
- GNUNET_break (0);
- GNUNET_free (un);
- return GNUNET_SYSERR;
- }
- }
- }
-
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "UNIX transmitted %u-byte message to %s (%d: %s)\n",
- (unsigned int) msgbuf_size,
- GNUNET_a2s ((const struct sockaddr *)un, un_len),
- (int) sent,
- (sent < 0) ? STRERROR (errno) : "ok");
- GNUNET_free (un);
- return sent;
-}
-
-
/**
- * Function obtain the network type for a queue
+ * Creates a new outbound queue the transport service will use to send
+ * data to another peer.
*
- * @param cls closure ('struct Plugin*')
- * @param queue the queue
- * @return the network type in HBO or #GNUNET_SYSERR
- */
-static enum GNUNET_ATS_Network_Type
-unix_plugin_get_network (void *cls,
- struct Queue *queue)
-{
- GNUNET_assert (NULL != queue);
- return GNUNET_ATS_NET_LOOPBACK;
-}
-
-
-/**
- * Function obtain the network type for a queue
- *
- * @param cls closure (`struct Plugin *`)
- * @param address the address
- * @return the network type
- */
-static enum GNUNET_ATS_Network_Type
-unix_plugin_get_network_for_address (void *cls,
- const struct GNUNET_HELLO_Address *address)
-
-{
- return GNUNET_ATS_NET_LOOPBACK;
-}
-
-
-/**
- * Creates a new outbound queue the transport service will use to send data to the
- * peer
- *
- * @param cls the plugin
- * @param address the address
+ * @param peer the target peer
+ * @param un the address
+ * @param un_len number of bytes in @a un
* @return the queue or NULL of max connections exceeded
*/
static struct Queue *
-unix_plugin_get_queue (void *cls,
- const struct GNUNET_HELLO_Address *address)
+unix_plugin_get_queue (const struct GNUNET_PeerIdentity *target,
+ const struct sockaddr_un *un,
+ socklen_t un_len)
{
struct Plugin *plugin = cls;
struct Queue *queue;
@@ -728,53 +409,22 @@ unix_plugin_get_queue (void *cls,
char * addrstr;
uint32_t addr_str_len;
uint32_t addr_option;
+ char *foreign_addr;
+ int is_abstract;
+
+ if (is_abstract = ('\0' == un.sun_path[0]))
+ un.sun_path[0] = '/';
+ GNUNET_asprintf (&foreign_addr,
+ "%s-%s#%d",
+ COMMUNICATOR_NAME,
+ un.sun_path,
+ is_abstract);
+
- ua = (struct UnixAddress *) address->address;
- if ((NULL == address->address) || (0 == address->address_length) ||
- (sizeof (struct UnixAddress) > address->address_length))
- {
- GNUNET_break (0);
- return NULL;
- }
addrstr = (char *) &ua[1];
addr_str_len = ntohl (ua->addrlen);
addr_option = ntohl (ua->options);
- if ( (0 != (UNIX_OPTIONS_USE_ABSTRACT_SOCKETS & addr_option)) &&
- (GNUNET_NO == plugin->is_abstract))
- {
- return NULL;
- }
-
- if (addr_str_len != address->address_length - sizeof (struct UnixAddress))
- {
- return NULL; /* This can be a legacy address */
- }
-
- if ('\0' != addrstr[addr_str_len - 1])
- {
- GNUNET_break (0);
- return NULL;
- }
- if (strlen (addrstr) + 1 != addr_str_len)
- {
- GNUNET_break (0);
- return NULL;
- }
-
- /* Check if a queue for this address already exists */
- if (NULL != (queue = lookup_queue (plugin,
- address)))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Found existing queue %p for address `%s'\n",
- queue,
- unix_plugin_address_to_string (NULL,
- address->address,
- address->address_length));
- return queue;
- }
-
/* create a new queue */
queue = GNUNET_new (struct Queue);
queue->target = address->peer;
@@ -795,14 +445,8 @@ unix_plugin_get_queue (void *cls,
GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
GNUNET_STATISTICS_set (plugin->env->stats,
"# UNIX queues active",
- GNUNET_CONTAINER_multipeermap_size (plugin->queue_map),
+ GNUNET_CONTAINER_multipeermap_size (queue_map),
GNUNET_NO);
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_INIT);
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_UP);
return queue;
}
@@ -891,245 +535,146 @@ unix_demultiplexer (struct Plugin *plugin,
/**
- * Read from UNIX domain socket (it is ready).
+ * We have been notified that our socket has something to read. Do the
+ * read and reschedule this function to be called again once more is
+ * available.
*
- * @param plugin the plugin
+ * @param cls NULL
+ */
+static void
+select_read_cb (void *cls);
+
+
+/**
+ * Function called when message was successfully passed to
+ * transport service. Continue read activity.
+ *
+ * @param cls NULL
+ */
+static void
+receive_complete_cb (void *cls)
+{
+ delivering_messages--;
+ if ( (NULL == read_task) &&
+ (delivering_messages < max_queue_length) )
+ read_task = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ unix_sock,
+ &select_read_cb,
+ NULL);
+}
+
+
+/**
+ * We have been notified that our socket has something to read. Do the
+ * read and reschedule this function to be called again once more is
+ * available.
+ *
+ * @param cls NULL
*/
static void
-unix_plugin_do_read (struct Plugin *plugin)
+select_read_cb (void *cls)
{
char buf[65536] GNUNET_ALIGN;
- struct UnixAddress *ua;
- struct UNIXMessage *msg;
- struct GNUNET_PeerIdentity sender;
+ struct Queue *queue;
+ const struct UNIXMessage *msg;
struct sockaddr_un un;
socklen_t addrlen;
ssize_t ret;
- int offset;
- int tsize;
- int is_abstract;
- char *msgbuf;
- const struct GNUNET_MessageHeader *currhdr;
- uint16_t csize;
- size_t ua_len;
+ uint16_t msize;
+ read_task = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ unix_sock,
+ &select_read_cb,
+ NULL);
addrlen = sizeof (un);
- memset (&un, 0, sizeof (un));
+ memset (&un,
+ 0,
+ sizeof (un));
ret = GNUNET_NETWORK_socket_recvfrom (unix_sock,
- buf, sizeof (buf),
+ buf,
+ sizeof (buf),
(struct sockaddr *) &un,
&addrlen);
- if ((GNUNET_SYSERR == ret) && ((errno == EAGAIN) || (errno == ENOBUFS)))
+ if ( (-1 == ret) &&
+ ( (EAGAIN == errno) ||
+ (ENOBUFS == errno) ) )
return;
- if (GNUNET_SYSERR == ret)
+ if (-1 == ret)
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
"recvfrom");
return;
}
- else
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Read %d bytes from socket %s\n",
- (int) ret,
- un.sun_path);
- }
-
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Read %d bytes from socket %s\n",
+ (int) ret,
+ un.sun_path);
GNUNET_assert (AF_UNIX == (un.sun_family));
- is_abstract = GNUNET_NO;
- if ('\0' == un.sun_path[0])
- {
- un.sun_path[0] = '@';
- is_abstract = GNUNET_YES;
- }
-
- ua_len = sizeof (struct UnixAddress) + strlen (un.sun_path) + 1;
- ua = GNUNET_malloc (ua_len);
- ua->addrlen = htonl (strlen (&un.sun_path[0]) +1);
- GNUNET_memcpy (&ua[1], &un.sun_path[0], strlen (un.sun_path) + 1);
- if (is_abstract)
- ua->options = htonl(UNIX_OPTIONS_USE_ABSTRACT_SOCKETS);
- else
- ua->options = htonl(UNIX_OPTIONS_NONE);
-
msg = (struct UNIXMessage *) buf;
- csize = ntohs (msg->header.size);
- if ((csize < sizeof (struct UNIXMessage)) || (csize > ret))
+ msize = ntohs (msg->header.size);
+ if ( (msize < sizeof (struct UNIXMessage)) ||
+ (msize > ret) )
{
GNUNET_break_op (0);
- GNUNET_free (ua);
return;
}
- msgbuf = (char *) &msg[1];
- GNUNET_memcpy (&sender,
- &msg->sender,
- sizeof (struct GNUNET_PeerIdentity));
- offset = 0;
- tsize = csize - sizeof (struct UNIXMessage);
- while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
+ queue = lookup_queue (&msg->sender,
+ un,
+ addrlen);
+ if (NULL == queue)
+ queue = setup_queue (&msg->sender,
+ un,
+ addrlen);
+ if (NULL == queue)
{
- currhdr = (struct GNUNET_MessageHeader *) &msgbuf[offset];
- csize = ntohs (currhdr->size);
- if ((csize < sizeof (struct GNUNET_MessageHeader)) ||
- (csize > tsize - offset))
- {
- GNUNET_break_op (0);
- break;
- }
- unix_demultiplexer (plugin, &sender, currhdr, ua, ua_len);
- offset += csize;
+ GNUENT_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Maximum number of UNIX connections exceeded, dropping incoming message\n"));
+ return;
}
- GNUNET_free (ua);
-}
-
-
-/**
- * Write to UNIX domain socket (it is ready).
- *
- * @param plugin handle to the plugin
- */
-static void
-unix_plugin_do_write (struct Plugin *plugin)
-{
- ssize_t sent = 0;
- struct UNIXMessageWrapper *msgw;
- struct Queue *queue;
- int did_delete;
+
- queue = NULL;
- did_delete = GNUNET_NO;
- while (NULL != (msgw = plugin->msg_head))
- {
- if (GNUNET_TIME_absolute_get_remaining (msgw->timeout).rel_value_us > 0)
- break; /* Message is ready for sending */
- /* Message has a timeout */
- did_delete = GNUNET_YES;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout for message with %u bytes \n",
- (unsigned int) msgw->msgsize);
- GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
- plugin->msg_tail,
- msgw);
- queue = msgw->queue;
- queue->msgs_in_queue--;
- GNUNET_assert (queue->bytes_in_queue >= msgw->msgsize);
- queue->bytes_in_queue -= msgw->msgsize;
- GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
- plugin->bytes_in_queue -= msgw->msgsize;
- GNUNET_STATISTICS_set (plugin->env->stats,
- "# bytes currently in UNIX buffers",
- plugin->bytes_in_queue,
- GNUNET_NO);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# UNIX bytes discarded",
- msgw->msgsize,
- GNUNET_NO);
- if (NULL != msgw->cont)
- msgw->cont (msgw->cont_cls,
- &msgw->queue->target,
- GNUNET_SYSERR,
- msgw->payload,
- 0);
- GNUNET_free (msgw->msg);
- GNUNET_free (msgw);
- }
- if (NULL == msgw)
{
- if (GNUNET_YES == did_delete)
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_UPDATE);
- return; /* Nothing to send at the moment */
- }
- queue = msgw->queue;
- sent = unix_real_send (plugin,
- unix_sock,
- &queue->target,
- (const char *) msgw->msg,
- msgw->msgsize,
- msgw->priority,
- msgw->timeout,
- msgw->queue->address->address,
- msgw->queue->address->address_length,
- msgw->payload,
- msgw->cont, msgw->cont_cls);
- if (RETRY == sent)
- {
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# UNIX retry attempts",
- 1, GNUNET_NO);
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_UPDATE);
- return;
+ uint16_t offset = 0;
+ uint16_t tsize = msize - sizeof (struct UNIXMessage);
+ const char *msgbuf = (const char *) &msg[1];
+
+ while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
+ {
+ const struct GNUNET_MessageHeader *currhdr;
+ struct GNUNET_MessageHeader al_hdr;
+ uint16_t csize;
+
+ currhdr = (const struct GNUNET_MessageHeader *) &msgbuf[offset];
+ /* ensure aligned access */
+ memcpy (&al_hdr,
+ currhdr,
+ sizeof (al_hdr));
+ csize = ntohs (al_hdr.size);
+ if ( (csize < sizeof (struct GNUNET_MessageHeader)) ||
+ (csize > tsize - offset))
+ {
+ GNUNET_break_op (0);
+ break;
+ }
+ ret = GNUNET_TRANSPORT_communicator_receive (ch,
+ &msg->sender,
+ currhdr,
+ &receive_complete_cb,
+ NULL);
+ if (GNUNET_SYSERR == ret)
+ return; /* transport not up */
+ if (GNUNET_NO == ret)
+ break;
+ delivering_messages++;
+ offset += csize;
+ }
}
- GNUNET_CONTAINER_DLL_remove (plugin->msg_head,
- plugin->msg_tail,
- msgw);
- queue->msgs_in_queue--;
- GNUNET_assert (queue->bytes_in_queue >= msgw->msgsize);
- queue->bytes_in_queue -= msgw->msgsize;
- GNUNET_assert (plugin->bytes_in_queue >= msgw->msgsize);
- plugin->bytes_in_queue -= msgw->msgsize;
- GNUNET_STATISTICS_set (plugin->env->stats,
- "# bytes currently in UNIX buffers",
- plugin->bytes_in_queue, GNUNET_NO);
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_UPDATE);
- if (GNUNET_SYSERR == sent)
+ if (delivering_messages >= max_queue_length)
{
- /* failed and no retry */
- if (NULL != msgw->cont)
- msgw->cont (msgw->cont_cls,
- &msgw->queue->target,
- GNUNET_SYSERR,
- msgw->payload, 0);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# UNIX bytes discarded",
- msgw->msgsize,
- GNUNET_NO);
- GNUNET_free (msgw->msg);
- GNUNET_free (msgw);
- return;
+ /* we should try to apply 'back pressure' */
+ GNUNET_SCHEDULER_cancel (read_task);
+ read_task = NULL;
}
- /* successfully sent bytes */
- GNUNET_break (sent > 0);
- GNUNET_STATISTICS_update (plugin->env->stats,
- "# bytes transmitted via UNIX",
- msgw->msgsize,
- GNUNET_NO);
- if (NULL != msgw->cont)
- msgw->cont (msgw->cont_cls,
- &msgw->queue->target,
- GNUNET_OK,
- msgw->payload,
- msgw->msgsize);
- GNUNET_free (msgw->msg);
- GNUNET_free (msgw);
-}
-
-
-/**
- * We have been notified that our socket has something to read.
- * Then reschedule this function to be called again once more is available.
- *
- * @param cls the plugin handle
- */
-static void
-unix_plugin_select_read (void *cls)
-{
- struct Plugin *plugin = cls;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
-
- plugin->read_task = NULL;
- tc = GNUNET_SCHEDULER_get_task_context ();
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY))
- unix_plugin_do_read (plugin);
- plugin->read_task =
- GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
- unix_sock,
- &unix_plugin_select_read, plugin);
}
@@ -1137,158 +682,155 @@ unix_plugin_select_read (void *cls)
* We have been notified that our socket is ready to write.
* Then reschedule this function to be called again once more is available.
*
- * @param cls the plugin handle
+ * @param cls NULL
*/
static void
-unix_plugin_select_write (void *cls)
+select_write_cb (void *cls)
{
- struct Plugin *plugin = cls;
- const struct GNUNET_SCHEDULER_TaskContext *tc;
-
- plugin->write_task = NULL;
- tc = GNUNET_SCHEDULER_get_task_context ();
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY))
- unix_plugin_do_write (plugin);
- if (NULL == plugin->msg_head)
- return; /* write queue empty */
- plugin->write_task =
- GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
- unix_sock,
- &unix_plugin_select_write, plugin);
-}
-
+ struct Queue *queue = queue_tail;
+ const struct GNUNET_MessageHeader *msg = queue->msg;
+ size_t msg_size = ntohs (msg->size);
+ ssize_t sent;
-/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin. Note that in the case of a
- * peer disconnecting, the continuation MUST be called
- * prior to the disconnect notification itself. This function
- * will be called with this peer's HELLO message to initiate
- * a fresh connection to another peer.
- *
- * @param cls closure
- * @param queue which queue must be used
- * @param msgbuf the message to transmit
- * @param msgbuf_size number of bytes in @a msgbuf
- * @param priority how important is the message (most plugins will
- * ignore message priority and just FIFO)
- * @param to how long to wait at most for the transmission (does not
- * require plugins to discard the message after the timeout,
- * just advisory for the desired delay; most plugins will ignore
- * this as well)
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...); can be NULL
- * @param cont_cls closure for @a cont
- * @return number of bytes used (on the physical network, with overheads);
- * -1 on hard errors (i.e. address invalid); 0 is a legal value
- * and does NOT mean that the message was not transmitted (DV)
- */
-static ssize_t
-unix_plugin_send (void *cls,
- struct Queue *queue,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative to,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
-{
- struct Plugin *plugin = cls;
- struct UNIXMessageWrapper *wrapper;
- struct UNIXMessage *message;
- int ssize;
+ /* take queue of the ready list */
+ write_task = NULL;
+ GNUNET_CONTAINER_DLL_remove (queue_head,
+ queue_tail,
+ queue);
+ if (NULL != queue_head)
+ write_task =
+ GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ unix_sock,
+ &select_write_cb,
+ NULL);
- if (GNUNET_OK !=
- GNUNET_CONTAINER_multipeermap_contains_value (plugin->queue_map,
- &queue->target,
- queue))
+ /* send 'msg' */
+ queue->msg = NULL;
+ GNUNET_MQ_impl_send_continue (queue->mq);
+ resend:
+ /* Send the data */
+ sent = GNUNET_NETWORK_socket_sendto (unix_sock,
+ queue->msg,
+ msg_size,
+ (const struct sockaddr *) mq->address,
+ mq->address_len);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UNIX transmitted message to %s (%d/%u: %s)\n",
+ GNUNET_i2s (&queue->target),
+ (int) sent,
+ (unsigned int) msg_size,
+ (sent < 0) ? STRERROR (errno) : "ok");
+ if (-1 != sent)
+ return; /* all good */
+ switch (errno)
{
- LOG (GNUNET_ERROR_TYPE_ERROR,
- "Invalid queue for peer `%s' `%s'\n",
- GNUNET_i2s (&queue->target),
- unix_plugin_address_to_string (NULL,
- queue->address->address,
- queue->address->address_length));
- GNUNET_break (0);
- return GNUNET_SYSERR;
+ case EAGAIN:
+ case ENOBUFS:
+ /* We should retry later... */
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG,
+ "send");
+ return;
+ case EMSGSIZE:
+ {
+ socklen_t size = 0;
+ socklen_t len = sizeof (size);
+
+ GNUNET_NETWORK_socket_getsockopt (unix_sock,
+ SOL_SOCKET,
+ SO_SNDBUF,
+ &size,
+ &len);
+ if (size > ntohs (msg->size))
+ {
+ /* Buffer is bigger than message: error, no retry
+ * This should never happen!*/
+ GNUNET_break (0);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Trying to increase socket buffer size from %u to %u for message size %u\n",
+ (unsigned int) size,
+ (unsigned int) m((msg_size / 1000) + 2) * 1000,
+ (unsigned int) msg_size);
+ size = ((msg_size / 1000) + 2) * 1000;
+ if (GNUNET_OK ==
+ GNUNET_NETWORK_socket_setsockopt (unix_sock,
+ SOL_SOCKET,
+ SO_SNDBUF,
+ &size,
+ sizeof (size)))
+ goto resend; /* Increased buffer size, retry sending */
+ /* Ok, then just try very modest increase */
+ size = msg_size;
+ if (GNUNET_OK ==
+ GNUNET_NETWORK_socket_setsockopt (unix_sock,
+ SOL_SOCKET,
+ SO_SNDBUF,
+ &size,
+ sizeof (size)))
+ goto resend; /* Increased buffer size, retry sending */
+ /* Could not increase buffer size: error, no retry */
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+ "setsockopt");
+ return;
+ }
+ default:
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+ "send");
+ return;
}
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Sending %u bytes with queue for peer `%s' `%s'\n",
- msgbuf_size,
- GNUNET_i2s (&queue->target),
- unix_plugin_address_to_string (NULL,
- queue->address->address,
- queue->address->address_length));
- ssize = sizeof (struct UNIXMessage) + msgbuf_size;
- message = GNUNET_malloc (sizeof (struct UNIXMessage) + msgbuf_size);
- message->header.size = htons (ssize);
- message->header.type = htons (0);
- GNUNET_memcpy (&message->sender, plugin->env->my_identity,
- sizeof (struct GNUNET_PeerIdentity));
- GNUNET_memcpy (&message[1], msgbuf, msgbuf_size);
- wrapper = GNUNET_new (struct UNIXMessageWrapper);
- wrapper->msg = message;
- wrapper->msgsize = ssize;
- wrapper->payload = msgbuf_size;
- wrapper->priority = priority;
- wrapper->timeout = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
- to);
- wrapper->cont = cont;
- wrapper->cont_cls = cont_cls;
- wrapper->queue = queue;
- GNUNET_CONTAINER_DLL_insert_tail (plugin->msg_head,
- plugin->msg_tail,
- wrapper);
- plugin->bytes_in_queue += ssize;
- queue->bytes_in_queue += ssize;
- queue->msgs_in_queue++;
- GNUNET_STATISTICS_set (plugin->env->stats,
- "# bytes currently in UNIX buffers",
- plugin->bytes_in_queue,
- GNUNET_NO);
- notify_queue_monitor (plugin,
- queue,
- GNUNET_TRANSPORT_SS_UPDATE);
- if (NULL == plugin->write_task)
- plugin->write_task =
- GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
- unix_sock,
- &unix_plugin_select_write, plugin);
- return ssize;
}
/**
- * Signature of functions implementing the
- * sending functionality of a message queue.
+ * Signature of functions implementing the sending functionality of a
+ * message queue.
*
* @param mq the message queue
* @param msg the message to send
- * @param impl_state state of the implementation
+ * @param impl_state our `struct Queue`
*/
static void
mq_send (struct GNUNET_MQ_Handle *mq,
const struct GNUNET_MessageHeader *msg,
void *impl_state)
{
+ struct Queue *queue = impl_state;
+
+ GNUNET_assert (mq == queue->mq);
+ GNUNET_assert (NULL == queue->msg);
+ queue->msg = msg;
+ GNUNET_CONTAINER_DLL_insert (queue_head,
+ queue_tail,
+ queue);
+ if (NULL == write_task)
+ write_task =
+ GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ unix_sock,
+ &select_write_cb,
+ NULL);
}
/**
- * Signature of functions implementing the
- * destruction of a message queue.
- * Implementations must not free @a mq, but should
- * take care of @a impl_state.
+ * Signature of functions implementing the destruction of a message
+ * queue. Implementations must not free @a mq, but should take care
+ * of @a impl_state.
*
* @param mq the message queue to destroy
- * @param impl_state state of the implementation
+ * @param impl_state our `struct Queue`
*/
static void
mq_destroy (struct GNUNET_MQ_Handle *mq,
void *impl_state)
{
+ struct Queue *queue = impl_state;
+
+ if (mq == queue->mq)
+ {
+ queue->mq = NULL;
+ queue_destroy (queue);
+ }
}
@@ -1296,12 +838,15 @@ mq_destroy (struct GNUNET_MQ_Handle *mq,
* Implementation function that cancels the currently sent message.
*
* @param mq message queue
- * @param impl_state state specific to the implementation
+ * @param impl_state our `struct Queue`
*/
static void
mq_cancel (struct GNUNET_MQ_Handle *mq,
void *impl_state)
{
+ struct Queue *queue = impl_state;
+
+ // FIXME: TBD!
}
@@ -1311,15 +856,17 @@ mq_cancel (struct GNUNET_MQ_Handle *mq,
* the message queue.
* Not every message queue implementation supports an error handler.
*
- * @param cls closure
+ * @param cls our `struct Queue`
* @param error error code
*/
static void
mq_error (void *cls,
enum GNUNET_MQ_Error error)
{
-}
+ struct Queue *queue = cls;
+ // FIXME: TBD!
+}
/**
@@ -1470,7 +1017,6 @@ do_shutdown (void *cls)
GNUNET_TRANSPORT_communicator_disconnect (ch);
ch = NULL;
}
- GNUNET_break (0 == bytes_in_queue);
}
@@ -1497,7 +1043,7 @@ run (void *cls,
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
- "transport-unix",
+ "communicator-unix",
"UNIXPATH",
&unix_socket_path))
{
@@ -1506,7 +1052,14 @@ run (void *cls,
"UNIXPATH");
return;
}
-
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (cfg,
+ "communicator-unix",
+ "MAX_QUEUE_LENGTH",
+ &max_queue_length))
+ max_queue_length = DEFAULT_MAX_QUEUE_LENGTH;
+
+
/* Initialize my flags */
is_abstract = 0;
#ifdef LINUX
@@ -1571,7 +1124,7 @@ run (void *cls,
queue_map = GNUNET_CONTAINER_multipeermap_create (10,
GNUNET_NO);
ch = GNUNET_TRANSPORT_communicator_connect (cfg,
- "unix",
+ COMMUNICATOR_NAME,
65535,
&mq_init,
NULL);
@@ -1587,13 +1140,16 @@ run (void *cls,
COMMUNICATOR_NAME,
unix_socket_path,
is_abstract);
-
ai = GNUNET_TRANSPORT_communicator_address_add (ch,
my_addr,
GNUNET_ATS_NET_LOOPBACK,
GNUNET_TIME_UNIT_FOREVER_REL);
GNUNET_free (my_addr);
GNUNET_free (unix_socket_path);
+ read_task = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ unix_sock,
+ &select_read_cb,
+ NULL);
}