FreeCalypso > hg > themwi-system-sw
view sip-in/prack.c @ 112:6aa63cf4620a
sip-in call clearing: select timeout implemented
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Wed, 28 Sep 2022 18:59:55 -0800 |
parents | c1c94b7fc2e2 |
children |
line wrap: on
line source
/* * Here we implement our handling of SIP PRACK, expected from callers * when we send them a reliable 180 Ringing response. */ #include <sys/types.h> #include <sys/socket.h> #include <sys/time.h> #include <netinet/in.h> #include <ctype.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 char *get_single_header(); extern struct call *find_call_by_sip_id(); extern unsigned sip_linger_error; void handle_sip_prack(req, ess, sin) struct sip_pkt_rx *req; struct uas_parse_hdrs *ess; struct sockaddr_in *sin; { struct call *call; struct sip_msg_out resp; char *rack, *orig_method, *cp; unsigned rseq, orig_num; int rc; call = find_call_by_sip_id(ess->call_id); if (!call) { start_response_out_msg(&resp, "481 Call-ID not found"); error_resp: rc = add_resp_basic_headers(&resp, ess, req->req_method); if (rc < 0) return; out_msg_finish(&resp); sip_tx_packet(&resp, sin); return; } rack = get_single_header(req, "RAck", (char *) 0, (int *) 0); if (!rack) { start_response_out_msg(&resp, "400 Missing RAck header"); goto error_resp; } if (!isdigit(*rack)) { malformed: start_response_out_msg(&resp, "400 Malformed RAck header"); goto error_resp; } rseq = strtoul(rack, &cp, 10); if (!isspace(*cp)) goto malformed; while (isspace(*cp)) cp++; if (!isdigit(*cp)) goto malformed; orig_num = strtoul(cp, &cp, 10); if (!isspace(*cp)) goto malformed; while (isspace(*cp)) cp++; if (!isupper(*cp)) goto malformed; orig_method = cp; while (isalnum(*cp)) cp++; if (*cp) goto malformed; if (rseq != 1 || orig_num != call->invite_cseq || strcmp(orig_method, "INVITE")) { start_response_out_msg(&resp, "481 RAck fails to match our 100rel response"); goto error_resp; } switch (call->sip_state) { case SIP_STATE_RINGING_REL: call->sip_state = SIP_STATE_RINGING; start_response_out_msg(&resp, "200 OK"); rc = add_resp_basic_headers(&resp, ess, req->req_method); if (rc < 0) { syslog(LOG_ERR, "PRACK 200 response length exceeded"); call->sip_state = SIP_STATE_MSG_SIZE_ERR; call->overall_state = OVERALL_STATE_TEARDOWN; disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_INTERWORKING); disconnect_tmgw(call); sip_mark_end_time(call, sip_linger_error); return; } out_msg_finish(&resp); sip_tx_packet(&resp, sin); return; case SIP_STATE_RINGING: case SIP_STATE_INVITE_200: start_response_out_msg(&resp, "200 OK"); rc = add_resp_basic_headers(&resp, ess, req->req_method); if (rc < 0) return; out_msg_finish(&resp); sip_tx_packet(&resp, sin); return; case SIP_STATE_INVITE_PROC: case SIP_STATE_CONNECTED: case SIP_STATE_BYE_SENT: case SIP_STATE_INVITE_ERR: case SIP_STATE_ENDED: start_response_out_msg(&resp, "481 No outstanding 100rel response"); goto error_resp; } }