Add $CISCO_SPLIT_DNS environment variable for vpnc-script

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

cstp.c

@@ -183,7 +183,12 @@ static int start_cstp_connection(struct openconnect_info *vpninfo)
 		free(inc);
 		inc = next;
 	}
-	vpninfo->split_includes = vpninfo->split_excludes = NULL;
+	for (inc = vpninfo->split_dns; inc; ) {
+		struct split_include *next = inc->next;
+		free(inc);
+		inc = next;
+	}
+	vpninfo->split_dns = vpninfo->split_includes = vpninfo->split_excludes = NULL;
 
 	/* Create (new) random master key for DTLS connection, if needed */
 	if (vpninfo->dtls_times.last_rekey + vpninfo->dtls_times.rekey <
@@ -377,6 +382,13 @@ static int start_cstp_connection(struct openconnect_info *vpninfo)
 			vpninfo->vpn_proxy_pac = new_option->value;
 		} else if (!strcmp(buf + 7, "Banner")) {
 			vpninfo->banner = new_option->value;
+		} else if (!strcmp(buf + 7, "Split-DNS")) {
+			struct split_include *dns = malloc(sizeof(*dns));
+			if (!dns)
+				continue;
+			dns->route = new_option->value;
+			dns->next = vpninfo->split_dns;
+			vpninfo->split_dns = dns;
 		} else if (!strcmp(buf + 7, "Split-Include")) {
 			struct split_include *inc = malloc(sizeof(*inc));
 			if (!inc)

openconnect-internal.h

@@ -209,6 +209,7 @@ struct openconnect_info {
 	const char *vpn_nbns[3];
 	const char *vpn_domain;
 	const char *vpn_proxy_pac;
+	struct split_include *split_dns;
 	struct split_include *split_includes;
 	struct split_include *split_excludes;
 

tun.c

@@ -310,6 +310,32 @@ static void set_script_env(struct openconnect_info *vpninfo)
 	if (vpninfo->vpn_proxy_pac)
 		setenv("CISCO_PROXY_PAC", vpninfo->vpn_proxy_pac, 1);
 
+	if (vpninfo->split_dns) {
+		char *list;
+		int len = 0;
+		struct split_include *dns = vpninfo->split_dns;
+
+		while (dns) {
+			len += strlen(dns->route) + 1;
+			dns = dns->next;
+		}
+		list = malloc(len);
+		if (list) {
+			char *p = list;
+
+			dns = vpninfo->split_dns;
+			while (1) {
+				strcpy(p, dns->route);
+				p += strlen(p);
+				dns = dns->next;
+				if (!dns)
+					break;
+				*(p++) = ' ';
+			}
+			setenv("CISCO_SPLIT_DNS", list, 1);
+			free(list);
+		}
+	}
 	if (vpninfo->split_includes) {
 		struct split_include *this = vpninfo->split_includes;
 		int nr_split_includes = 0;