FreeCalypso > hg > themwi-system-sw
view sip-out/uac_out.c @ 217:9f6a148ceb25
tcpserv-dump: brown paper bag
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 24 Jul 2023 22:33:01 -0800 |
parents | e54b0a9e322f |
children |
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/* * In this module we implement generation of outgoing SIP messages * in the UAC role. */ #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 "../include/out_routes.h" #include "../libsip/out_msg.h" #include "../libsip/sdp.h" #include "call.h" extern struct call *find_call_by_sip_id(); extern struct in_addr sip_bind_ip; extern unsigned sip_bind_port; extern unsigned max_forwards; extern struct timeval cur_event_time; add_req_boilerplate(msg, call, cseq, to_tag) struct sip_msg_out *msg; struct call *call; char *cseq, *to_tag; { char strbuf[256]; int rc; sprintf(strbuf, "SIP/2.0/UDP %s:%u", inet_ntoa(sip_bind_ip), sip_bind_port); rc = out_msg_add_header(msg, "Via", strbuf); if (rc < 0) return rc; rc = out_msg_add_header(msg, "From", call->from_header); if (rc < 0) return rc; if (to_tag && to_tag[0]) { sprintf(strbuf, "<%s>;tag=%s", call->to_uri, to_tag); rc = out_msg_add_header(msg, "To", strbuf); } else rc = out_msg_add_header(msg, "To", call->to_uri); if (rc < 0) return rc; rc = out_msg_add_header(msg, "Call-ID", call->sip_call_id); if (rc < 0) return rc; rc = out_msg_add_header(msg, "CSeq", cseq); if (rc < 0) return rc; sprintf(strbuf, "%u", max_forwards); return out_msg_add_header(msg, "Max-Forwards", strbuf); } add_contact_header(msg) struct sip_msg_out *msg; { char strbuf[80]; sprintf(strbuf, "<sip:%s:%u;transport=udp>", inet_ntoa(sip_bind_ip), sip_bind_port); return out_msg_add_header(msg, "Contact", strbuf); } fill_invite_req_msg(msg, call) struct sip_msg_out *msg; struct call *call; { struct sdp_gen sdp; int rc; rc = start_request_out_msg(msg, "INVITE", call->to_uri); if (rc < 0) return rc; rc = add_req_boilerplate(msg, call, "1 INVITE", (char *) 0); if (rc < 0) return rc; rc = add_contact_header(msg); if (rc < 0) return rc; rc = out_msg_add_header(msg, "Content-Type", "application/sdp"); if (rc < 0) return rc; bzero(&sdp, sizeof sdp); sdp.conn_ip = call->pstn_rtp_local.sin_addr; sdp.conn_port = ntohs(call->pstn_rtp_local.sin_port); sdp.codec_mask = SDP_CODEC_MASK_BOTH; sdp.session_id = sdp.conn_port << 16; sdp.owner_ip = sip_bind_ip; return out_msg_finish_sdp(msg, &sdp); } fill_cancel_req_msg(msg, call) struct sip_msg_out *msg; struct call *call; { int rc; rc = start_request_out_msg(msg, "CANCEL", call->to_uri); if (rc < 0) return rc; rc = add_req_boilerplate(msg, call, "1 CANCEL", (char *) 0); if (rc < 0) return rc; out_msg_finish(msg); return 0; } fill_bye_req_msg(msg, call) struct sip_msg_out *msg; struct call *call; { int rc; rc = start_request_out_msg(msg, "BYE", call->to_uri); if (rc < 0) return rc; rc = add_req_boilerplate(msg, call, "2 BYE", call->to_tag); if (rc < 0) return rc; out_msg_finish(msg); return 0; } void start_sip_out(call) struct call *call; { struct sip_msg_out msg; int rc; sprintf(call->sip_call_id, "%08u_%u@%s", (unsigned)(cur_event_time.tv_sec % 100000000), ntohs(call->pstn_rtp_local.sin_port), inet_ntoa(sip_bind_ip)); if (find_call_by_sip_id(call->sip_call_id)) { syslog(LOG_ERR, "generated Call-ID collision!"); call->overall_state = OVERALL_STATE_TEARDOWN; disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_SWITCH_CONG); disconnect_tmgw(call); return; } sprintf(call->from_header, "<sip:%s@%s>;tag=out%u", call->from_user, inet_ntoa(sip_bind_ip), ntohs(call->pstn_rtp_local.sin_port)); rc = fill_invite_req_msg(&msg, call); if (rc < 0) { syslog(LOG_CRIT, "generated SIP INVITE req exceeds msg size!"); call->overall_state = OVERALL_STATE_TEARDOWN; disconnect_mncc(call, GSM48_CAUSE_LOC_PRN_S_LU, GSM48_CC_CAUSE_NETWORK_OOO); disconnect_tmgw(call); return; } sip_tx_packet(&msg, &call->udp_sin); call->overall_state = OVERALL_STATE_SIP_OUT; call->sip_call_exists = 1; call->sip_state = SIP_STATE_INV_SENT; call->sip_tx_count = 1; } void initiate_sip_cancel(call) struct call *call; { struct sip_msg_out msg; fill_cancel_req_msg(&msg, call); sip_tx_packet(&msg, &call->udp_sin); call->sip_state = SIP_STATE_CANCEL_SENT; call->sip_tx_count = 1; } void initiate_bye(call) struct call *call; { struct sip_msg_out msg; fill_bye_req_msg(&msg, call); sip_tx_packet(&msg, &call->udp_sin); call->sip_state = SIP_STATE_BYE_SENT; call->sip_tx_count = 1; }