FreeCalypso > hg > themwi-system-sw
view sip-in/cancel.c @ 124:7e04d28fae8b
sip-in: default use-100rel to no
BulkVS servers act badly when we send a reliable 180 Ringing response
to an incoming call, even though they advertise 100rel support in
the Supported header in the INVITE packet, and we probably won't be
implementing 100rel for outbound because doing per-the-spec PRACK
as a UAC is just too burdensome. Therefore, we need to consider
100rel extension as not-really-supported in themwi-system-sw.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 01 Oct 2022 15:54:50 -0800 |
parents | 9b87894704eb |
children |
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/* * Here we implement our handling of SIP CANCEL method. */ #include <sys/types.h> #include <sys/socket.h> #include <sys/time.h> #include <netinet/in.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <syslog.h> #include "../include/gsm48_const.h" #include "../libsip/parse.h" #include "../libsip/uas_basic.h" #include "../libsip/out_msg.h" #include "call.h" extern struct call *find_call_by_sip_id(); static void cancel_200_response(req, ess, sin, call) struct sip_pkt_rx *req; struct uas_parse_hdrs *ess; struct sockaddr_in *sin; struct call *call; { struct sip_msg_out resp; char cseq_str[32]; int rc; start_response_out_msg(&resp, "200 OK"); rc = out_msg_add_header(&resp, "From", call->invite_from); if (rc < 0) { msg_size_err: syslog(LOG_ERR, "CANCEL 200 response length exceeded"); return; } rc = out_msg_add_header(&resp, "To", call->invite_to); if (rc < 0) goto msg_size_err; rc = out_msg_add_header(&resp, "Call-ID", call->sip_call_id); if (rc < 0) goto msg_size_err; sprintf(cseq_str, "%u CANCEL", call->invite_cseq); rc = out_msg_add_header(&resp, "CSeq", cseq_str); if (rc < 0) goto msg_size_err; rc = out_msg_add_header(&resp, "Via", ess->via); if (rc < 0) goto msg_size_err; out_msg_finish(&resp); sip_tx_packet(&resp, sin); } static void cancel_481_response(req, ess, sin) struct sip_pkt_rx *req; struct uas_parse_hdrs *ess; struct sockaddr_in *sin; { struct sip_msg_out resp; int rc; start_response_out_msg(&resp, "481 Call-ID/CSeq not found"); rc = add_resp_basic_headers(&resp, ess, req->req_method); if (rc < 0) return; out_msg_finish(&resp); sip_tx_packet(&resp, sin); } void handle_sip_cancel(req, ess, sin) struct sip_pkt_rx *req; struct uas_parse_hdrs *ess; struct sockaddr_in *sin; { struct call *call; call = find_call_by_sip_id(ess->call_id); if (!call) { cancel_481_response(req, ess, sin); return; } /* weed out wrong CSeq */ if (ess->cseq_num != call->invite_cseq) { cancel_481_response(req, ess, sin); return; } /* it is for us - act on it */ switch (call->sip_state) { case SIP_STATE_INVITE_PROC: case SIP_STATE_RINGING: case SIP_STATE_RINGING_REL: call->overall_state = OVERALL_STATE_TEARDOWN; disconnect_mncc(call, GSM48_CAUSE_LOC_NET_BEYOND, GSM48_CC_CAUSE_NORM_CALL_CLEAR); disconnect_tmgw(call); strcpy(call->invite_fail, "487 Call attempt terminated"); signal_invite_error(call); break; case SIP_STATE_MSG_SIZE_ERR: return; } cancel_200_response(req, ess, sin, call); }