Ticket 831: Quick/initial patch for automatic transport switching (to TCP) when a SIP request size is larger than 1300 and is about to send via UDP.
git-svn-id: https://svn.pjsip.org/repos/pjproject/branches/projects/sipit24@2703 74dad513-b988-da41-8d7b-12977e46ad98
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@ -1181,6 +1181,40 @@ stateless_send_resolver_callback( pj_status_t status,
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/* Copy server addresses */
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pj_memcpy( &stateless_data->addr, addr, sizeof(pjsip_server_addresses));
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/* RFC 3261 section 18.1.1:
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* If a request is within 200 bytes of the path MTU, or if it is larger
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* than 1300 bytes and the path MTU is unknown, the request MUST be sent
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* using an RFC 2914 [43] congestion controlled transport protocol, such
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* as TCP.
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*/
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if (stateless_data->tdata->msg->type == PJSIP_REQUEST_MSG &&
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addr->count > 0 &&
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addr->entry[0].type == PJSIP_TRANSPORT_UDP)
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{
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char buf[1500];
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int len;
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/* Check if request message is larger than 1300 bytes. */
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len = pjsip_msg_print(stateless_data->tdata->msg, buf, 1300);
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if (len < 0) {
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int i;
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int count = stateless_data->addr.count;
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/* Insert "TCP version" of resolved UDP addresses at the
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* beginning.
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*/
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if (count * 2 > PJSIP_MAX_RESOLVED_ADDRESSES)
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count = PJSIP_MAX_RESOLVED_ADDRESSES / 2;
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for (i = 0; i < count; ++i) {
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pj_memcpy(&stateless_data->addr.entry[i+count],
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&stateless_data->addr.entry[i],
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sizeof(stateless_data->addr.entry[0]));
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stateless_data->addr.entry[i].type = PJSIP_TRANSPORT_TCP;
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}
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stateless_data->addr.count = count * 2;
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}
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}
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/* Process the addresses. */
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stateless_send_transport_cb( stateless_data, stateless_data->tdata,
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-PJ_EPENDING);
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