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chan_sip: Replace sip_tls_read() and resolve the large SDP poll issue.

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Replace sip_tls_read() and sip_tcp_read() with a single function and
resolve the poll/wait issue with large SDP payloads.

ASTERISK-18345 #close
Reported by: Stephane Chazelas
Patches:
      tcptls_pollv4.diff (license #5835) patch uploaded by Elazar Broad

Review: https://reviewboard.asterisk.org/r/3882/
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Merged revisions 420434 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 420435 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 420436 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@420437 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2014-08-07 21:58:38 +00:00
parent 6653d7e8ee
commit a1424a2f1a
1 changed files with 14 additions and 165 deletions
Download Patch File Download Diff File Expand all files Collapse all files

179
channels/chan_sip.c
View File

@@ -2694,156 +2694,6 @@ static int sip_check_authtimeout(time_t start)
return timeout;
}
/*!
* \brief Read a SIP request or response from a TLS connection
*
* Because TLS operations are hidden from view via a FILE handle, the
* logic for reading data is a bit complex, and we have to make periodic
* checks to be sure we aren't taking too long to perform the necessary
* action.
*
* \todo XXX This should be altered in the future not to use a FILE pointer
*
* \param req The request structure to fill in
* \param tcptls_session The TLS connection on which the data is being received
* \param authenticated A flag indicating whether authentication has occurred yet.
* This is only relevant in a server role.
* \param start The time at which we started attempting to read data. Used in
* determining if there has been a timeout.
* \param me Thread info. Used as a means of determining if the session needs to be stoppped.
* \retval -1 Failed to read data
* \retval 0 Succeeded in reading data
*/
static int sip_tls_read(struct sip_request *req, struct sip_request *reqcpy, struct ast_tcptls_session_instance *tcptls_session,
int authenticated, time_t start, struct sip_threadinfo *me)
{
int res, content_length, after_poll = 1, need_poll = 1;
size_t datalen = ast_str_strlen(req->data);
char buf[1024] = "";
int timeout = -1;
/* Read in headers one line at a time */
while (datalen < 4 || strncmp(REQ_OFFSET_TO_STR(req, data->used - 4), "\r\n\r\n", 4)) {
if (!tcptls_session->client && !authenticated) {
if ((timeout = sip_check_authtimeout(start)) < 0) {
ast_debug(2, "SIP TLS server failed to determine authentication timeout\n");
return -1;
}
if (timeout == 0) {
ast_debug(2, "SIP TLS server timed out\n");
return -1;
}
} else {
timeout = -1;
}
/* special polling behavior is required for TLS
* sockets because of the buffering done in the
* TLS layer */
if (need_poll) {
need_poll = 0;
after_poll = 1;
res = ast_wait_for_input(tcptls_session->fd, timeout);
if (res < 0) {
ast_debug(2, "SIP TLS server :: ast_wait_for_input returned %d\n", res);
return -1;
} else if (res == 0) {
/* timeout */
ast_debug(2, "SIP TLS server timed out\n");
return -1;
}
}
ao2_lock(tcptls_session);
if (!fgets(buf, sizeof(buf), tcptls_session->f)) {
ao2_unlock(tcptls_session);
if (after_poll) {
return -1;
} else {
need_poll = 1;
continue;
}
}
ao2_unlock(tcptls_session);
after_poll = 0;
if (me->stop) {
return -1;
}
ast_str_append(&req->data, 0, "%s", buf);
datalen = ast_str_strlen(req->data);
if (datalen > SIP_MAX_PACKET_SIZE) {
ast_log(LOG_WARNING, "Rejecting TLS packet from '%s' because way too large: %zu\n",
ast_sockaddr_stringify(&tcptls_session->remote_address), datalen);
return -1;
}
}
copy_request(reqcpy, req);
parse_request(reqcpy);
/* In order to know how much to read, we need the content-length header */
if (sscanf(sip_get_header(reqcpy, "Content-Length"), "%30d", &content_length)) {
while (content_length > 0) {
size_t bytes_read;
if (!tcptls_session->client && !authenticated) {
if ((timeout = sip_check_authtimeout(start)) < 0) {
return -1;
}
if (timeout == 0) {
ast_debug(2, "SIP TLS server timed out\n");
return -1;
}
} else {
timeout = -1;
}
if (need_poll) {
need_poll = 0;
after_poll = 1;
res = ast_wait_for_input(tcptls_session->fd, timeout);
if (res < 0) {
ast_debug(2, "SIP TLS server :: ast_wait_for_input returned %d\n", res);
return -1;
} else if (res == 0) {
/* timeout */
ast_debug(2, "SIP TLS server timed out\n");
return -1;
}
}
ao2_lock(tcptls_session);
if (!(bytes_read = fread(buf, 1, MIN(sizeof(buf) - 1, content_length), tcptls_session->f))) {
ao2_unlock(tcptls_session);
if (after_poll) {
return -1;
} else {
need_poll = 1;
continue;
}
}
buf[bytes_read] = '\0';
ao2_unlock(tcptls_session);
after_poll = 0;
if (me->stop) {
return -1;
}
content_length -= strlen(buf);
ast_str_append(&req->data, 0, "%s", buf);
datalen = ast_str_strlen(req->data);
if (datalen > SIP_MAX_PACKET_SIZE) {
ast_log(LOG_WARNING, "Rejecting TLS packet from '%s' because way too large: %zu\n",
ast_sockaddr_stringify(&tcptls_session->remote_address), datalen);
return -1;
}
}
}
/*! \todo XXX If there's no Content-Length or if the content-length and what
we receive is not the same - we should generate an error */
return 0;
}
/*!
* \brief Indication of a TCP message's integrity
*/
@@ -2997,14 +2847,14 @@ static enum message_integrity check_message_integrity(struct ast_str **request,
}
/*!
* \brief Read SIP request or response from a TCP connection
* \brief Read SIP request or response from a TCP/TLS connection
*
* \param req The request structure to be filled in
* \param tcptls_session The TCP connection from which to read
* \param tcptls_session The TCP/TLS connection from which to read
* \retval -1 Failed to read data
* \retval 0 Successfully read data
*/
static int sip_tcp_read(struct sip_request *req, struct ast_tcptls_session_instance *tcptls_session,
static int sip_tcptls_read(struct sip_request *req, struct ast_tcptls_session_instance *tcptls_session,
int authenticated, time_t start)
{
enum message_integrity message_integrity = MESSAGE_FRAGMENT;
@@ -3022,7 +2872,7 @@ static int sip_tcp_read(struct sip_request *req, struct ast_tcptls_session_insta
}
if (timeout == 0) {
ast_debug(2, "SIP TCP server timed out\n");
ast_debug(2, "SIP TCP/TLS server timed out\n");
return -1;
}
} else {
@@ -3030,19 +2880,22 @@ static int sip_tcp_read(struct sip_request *req, struct ast_tcptls_session_insta
}
res = ast_wait_for_input(tcptls_session->fd, timeout);
if (res < 0) {
ast_debug(2, "SIP TCP server :: ast_wait_for_input returned %d\n", res);
ast_debug(2, "SIP TCP/TLS server :: ast_wait_for_input returned %d\n", res);
return -1;
} else if (res == 0) {
ast_debug(2, "SIP TCP server timed out\n");
ast_debug(2, "SIP TCP/TLS server timed out\n");
return -1;
}
res = recv(tcptls_session->fd, readbuf, sizeof(readbuf) - 1, 0);
res = ast_tcptls_server_read(tcptls_session, readbuf, sizeof(readbuf) - 1);
if (res < 0) {
ast_debug(2, "SIP TCP server error when receiving data\n");
if (errno == EAGAIN || errno == EINTR) {
continue;
}
ast_debug(2, "SIP TCP/TLS server error when receiving data\n");
return -1;
} else if (res == 0) {
ast_debug(2, "SIP TCP server has shut down\n");
ast_debug(2, "SIP TCP/TLS server has shut down\n");
return -1;
}
readbuf[res] = '\0';
@@ -3054,7 +2907,7 @@ static int sip_tcp_read(struct sip_request *req, struct ast_tcptls_session_insta
datalen = ast_str_strlen(req->data);
if (datalen > SIP_MAX_PACKET_SIZE) {
ast_log(LOG_WARNING, "Rejecting TCP packet from '%s' because way too large: %zu\n",
ast_log(LOG_WARNING, "Rejecting TCP/TLS packet from '%s' because way too large: %zu\n",
ast_sockaddr_stringify(&tcptls_session->remote_address), datalen);
return -1;
}
@@ -3220,12 +3073,8 @@ static void *_sip_tcp_helper_thread(struct ast_tcptls_session_instance *tcptls_s
req.socket.port = htons(ourport_tcp);
}
req.socket.fd = tcptls_session->fd;
if (tcptls_session->ssl) {
res = sip_tls_read(&req, &reqcpy, tcptls_session, authenticated, start, me);
} else {
res = sip_tcp_read(&req, tcptls_session, authenticated, start);
}
res = sip_tcptls_read(&req, tcptls_session, authenticated, start);
if (res < 0) {
goto cleanup;
}