# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1663628157 28800
# Node ID 8cf85edca543f6c2188fac9b24d35519a5145c0a
# Parent  709b78a4ebf0bb1f16742e2c12b0d66180f0a954
sip-in: implement SIP ACK handling

diff -r 709b78a4ebf0 -r 8cf85edca543 sip-in/Makefile
--- a/sip-in/Makefile	Sun Sep 18 21:56:20 2022 -0800
+++ b/sip-in/Makefile	Mon Sep 19 14:55:57 2022 -0800
@@ -2,8 +2,8 @@
 CFLAGS=	-O2
 PROG=	themwi-sip-in
 OBJS=	call_list.o call_setup.o disconnect.o invite.o main.o mgw_ops.o \
-	mgw_sock.o mncc_handle.o mncc_sock.o readconf.o retrans.o sip_log.o \
-	sip_uas.o sip_udp.o
+	mgw_sock.o mncc_handle.o mncc_sock.o readconf.o retrans.o sip_ack.o \
+	sip_log.o sip_uas.o sip_udp.o
 LIBS=	../libnumdb/libnumdb.a ../libsip/libsip.a ../libutil/libutil.a
 INSTBIN=/usr/local/bin
 
diff -r 709b78a4ebf0 -r 8cf85edca543 sip-in/sip_ack.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sip-in/sip_ack.c	Mon Sep 19 14:55:57 2022 -0800
@@ -0,0 +1,43 @@
+/*
+ * Here we implement our handling of SIP ACK, the last step
+ * in the 3-way INVITE handshake.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <syslog.h>
+#include "../libsip/parse.h"
+#include "../libsip/uas_basic.h"
+#include "call.h"
+
+extern struct call *find_call_by_sip_id();
+
+void
+handle_sip_ack(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)
+		return;		/* ignore spurious ACK */
+	/* weed out wrong CSeq */
+	if (ess->cseq_num != call->invite_cseq)
+		return;
+	switch (call->sip_state) {
+	case SIP_STATE_INVITE_200:
+		call->sip_state = SIP_STATE_CONNECTED;
+		break;
+	case SIP_STATE_INVITE_ERR:
+		call->sip_state = SIP_STATE_ENDED;
+		break;
+	}
+}
diff -r 709b78a4ebf0 -r 8cf85edca543 sip-in/sip_uas.c
--- a/sip-in/sip_uas.c	Sun Sep 18 21:56:20 2022 -0800
+++ b/sip-in/sip_uas.c	Mon Sep 19 14:55:57 2022 -0800
@@ -64,7 +64,7 @@
 	if (!strcmp(msg->req_method, "INVITE"))
 		handle_sip_invite(msg, &ess, sin);
 	else if (!strcmp(msg->req_method, "ACK"))
-		method_tbi(msg, &ess, sin);
+		handle_sip_ack(msg, &ess, sin);
 	else if (!strcmp(msg->req_method, "CANCEL"))
 		method_tbi(msg, &ess, sin);
 	else if (!strcmp(msg->req_method, "BYE"))