provide hooks and fallbacks for rdomain support

misc.c

@@ -184,6 +184,9 @@ set_reuseaddr(int fd)
 char *
 get_rdomain(int fd)
 {
+#if defined(HAVE_SYS_GET_RDOMAIN)
+	return sys_get_rdomain(fd);
+#elif defined(__OpenBSD__)
 	int rtable;
 	char *ret;
 	socklen_t len = sizeof(rtable);
@@ -195,11 +198,17 @@ get_rdomain(int fd)
 	}
 	xasprintf(&ret, "%d", rtable);
 	return ret;
+#else /* defined(__OpenBSD__) */
+	return NULL;
+#endif
 }
 
 int
 set_rdomain(int fd, const char *name)
 {
+#if defined(HAVE_SYS_SET_RDOMAIN)
+	return sys_set_rdomain(fd, name);
+#elif defined(__OpenBSD__)
 	int rtable;
 	const char *errstr;
 
@@ -219,6 +228,10 @@ set_rdomain(int fd, const char *name)
 		return -1;
 	}
 	return 0;
+#else /* defined(__OpenBSD__) */
+	error("Setting routing domain is not supported on this platform");
+	return -1;
+#endif
 }
 
 /* Characters considered whitespace in strsep calls. */

servconf.c

@@ -735,6 +735,9 @@ add_one_listen_addr(ServerOptions *options, const char *addr,
 static int
 valid_rdomain(const char *name)
 {
+#if defined(HAVE_SYS_VALID_RDOMAIN)
+	return valid_rdomain(name)
+#elif defined(__OpenBSD__)
 	const char *errstr;
 	long long num;
 	struct rt_tableinfo info;
@@ -758,6 +761,10 @@ valid_rdomain(const char *name)
 		return 0;
 
 	return 1;
+#else /* defined(__OpenBSD__) */
+	error("Routing domains are not supported on this platform");
+	return 0;
+#endif
 }
 
 /*

sshd.c

@@ -1372,6 +1372,18 @@ check_ip_options(struct ssh *ssh)
 static void
 set_process_rdomain(struct ssh *ssh, const char *name)
 {
+#if defined(HAVE_SYS_SET_PROCESS_RDOMAIN)
+	if (name == NULL)
+		return; /* default */
+
+	if (strcmp(name, "%D") == 0) {
+		/* "expands" to routing domain of connection */
+		if ((name = ssh_packet_rdomain_in(ssh)) == NULL)
+			return;
+	}
+	/* NB. We don't pass 'ssh' to sys_set_process_rdomain() */
+	return sys_set_process_rdomain(name);
+#elif defined(__OpenBSD__)
 	int rtable, ortable = getrtable();
 	const char *errstr;
 
@@ -1391,6 +1403,9 @@ set_process_rdomain(struct ssh *ssh, const char *name)
 		fatal("Unable to set routing domain %d: %s",
 		    rtable, strerror(errno));
 	debug("%s: set routing domain %d (was %d)", __func__, rtable, ortable);
+#else /* defined(__OpenBSD__) */
+	fatal("Unable to set routing domain: not supported in this platform");
+#endif
 }
 
 /*