Add support for openbsd routing domain, #95

CHANGELOG

@@ -33,6 +33,8 @@ CHANGES:
 	- Fix DNS tunneling bug caused by uninitialized variable, #94
 	- Handle spaces when entering password interactively, fixes #93.
 		Patch by Hagar.
+	- Add -R option to set OpenBSD routing domain for the DNS socket.
+		Patch by laurent at gouloum fr, fixes #95.
 
 2009-06-01: 0.5.2 "WifiFree"
 	- Fixed client segfault on OS X, #57

man/iodine.8

@@ -17,6 +17,8 @@ iodine, iodined \- tunnel IPv4 over DNS
 .I chrootdir
 .B ] [-d
 .I device
+.B ] [-R
+.I rdomain
 .B ] [-m
 .I fragsize
 .B ] [-M
@@ -129,6 +131,9 @@ Skip raw UDP mode. If not used, iodine will try getting the public IP address
 of the iodined host and test if it is reachable directly. If it is, traffic
 will be sent to the server instead of the DNS relay.
 .TP
+.B -R rdomain
+Use OpenBSD routing domain 'rdomain' for the DNS connection.
+.TP
 .B -m fragsize
 Force maximum downstream fragment size. Not setting this will cause the
 client to automatically probe the maximum accepted downstream fragment size.

src/iodine.c

@@ -132,6 +132,7 @@ main(int argc, char **argv)
 	int lazymode;
 	int selecttimeout;
 	int hostname_maxlen;
+	int rtable = 0;
 
 	nameserv_addr = NULL;
 	topdomain = NULL;
@@ -170,7 +171,7 @@ main(int argc, char **argv)
 		__progname++;
 #endif
 
-	while ((choice = getopt(argc, argv, "vfhru:t:d:P:m:M:F:T:O:L:I:")) != -1) {
+	while ((choice = getopt(argc, argv, "vfhru:t:d:R:P:m:M:F:T:O:L:I:")) != -1) {
 		switch(choice) {
 		case 'v':
 			version();
@@ -194,6 +195,9 @@ main(int argc, char **argv)
 		case 'd':
 			device = optarg;
 			break;
+		case 'R':
+			rtable = atoi(optarg);
+			break;
 		case 'P':
 			strncpy(password, optarg, sizeof(password));
 			password[sizeof(password)-1] = 0;
@@ -321,6 +325,10 @@ main(int argc, char **argv)
 		retval = 1;
 		goto cleanup2;
 	}
+#ifdef OPENBSD
+	if (rtable > 0)
+		socket_setrtable(dns_fd, rtable);
+#endif
 
 	signal(SIGINT, sighandler);
 	signal(SIGTERM, sighandler);

src/util.c

@@ -67,3 +67,11 @@ get_resolvconf_addr()
 	return rv;
 }
 
+#ifdef OPENBSD
+void
+socket_setrtable(int fd, int rtable)
+{
+	if (setsockopt (fd, IPPROTO_IP, SO_RTABLE, &rtable, sizeof(rtable)) == -1)
+	    err(1, "Failed to set routing table %d", rtable);
+}
+#endif

src/util.h

@@ -2,5 +2,6 @@
 #define __UTIL_H__
 
 char *get_resolvconf_addr();
+void socket_setrtable(int fd, int rtable);
 
 #endif