FreeCalypso > hg > themwi-system-sw
view sip-in/cancel.c @ 123:a36b731bfef9
sip-manual-out: implement sending BYE and CANCEL
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 29 Sep 2022 17:21:11 -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); }