simplify the input of IPv6 networks

The prefix is specified as part of the network.

doc/sample.config

@@ -269,8 +269,7 @@ dns = 192.168.1.2
 #nbns = 192.168.1.3
 
 # The IPv6 subnet that leases will be given from.
-#ipv6-network = fc00::
+ipv6-network = fda9:4efe:7e3b:03ea::/64
-#ipv6-prefix = 16
 
 # The domains over which the provided DNS should be used. Use
 # multiple lines for multiple domains.

src/config.c

@@ -367,6 +367,28 @@ static char *get_brackets_string2(void *pool, const char *str)
 	return talloc_strndup(pool, p, len);
 }
 
+/* Parses the string ::1/prefix, to return prefix
+ * and modify the string to contain the network only.
+ */
+unsigned extract_prefix(char *network)
+{
+	char *p;
+	unsigned prefix;
+
+	if (network == NULL)
+		return 0;
+
+	p = strchr(network, '/');
+
+	if (p == NULL)
+		return 0;
+
+	prefix = atoi(p+1);
+	*p = 0;
+
+	return prefix;
+}
+
 const struct auth_mod_st *get_auth_mod(void)
 {
 	return amod;
@@ -646,7 +668,11 @@ unsigned force_cert_auth;
 
 	READ_STRING("ipv6-network", config->network.ipv6);
 
+	prefix = extract_prefix(config->network.ipv6);
+	if (prefix == 0) {
 		READ_NUMERIC("ipv6-prefix", prefix);
+	}
+
 	if (prefix > 0) {
 		config->network.ipv6_prefix = prefix;
 

src/ocserv-args.def

@@ -362,8 +362,7 @@ dns = 192.168.1.2
 #nbns = 192.168.1.3
 
 # The IPv6 subnet that leases will be given from.
-#ipv6-network = fc00::
+#ipv6-network = fda9:4efe:7e3b:03ea::/64
-#ipv6-prefix = 16
 
 # The domains over which the provided DNS should be used. Use
 # multiple lines for multiple domains.
@@ -421,7 +420,7 @@ route = 192.168.5.0/255.255.255.0
 # per group. Each file name on these directories must match the username
 # or the groupname.
 # The options allowed in the configuration files are dns, nbns,
-#  ipv?-network, ipv4-netmask, ipv6-prefix, rx/tx-per-sec, iroute, route,
+#  ipv?-network, ipv4-netmask, rx/tx-per-sec, iroute, route,
 #  net-priority, deny-roaming, no-udp, user-profile, require-cert, and cgroup.
 #
 # Note that the 'iroute' option allows to add routes on the server

src/sup-config/file.c

@@ -204,7 +204,13 @@ unsigned prefix = 0;
 	READ_RAW_STRING("ipv6-network", msg->ipv6_net);
 	READ_RAW_STRING("ipv4-netmask", msg->ipv4_netmask);
 
+	msg->ipv6_prefix = extract_prefix(msg->ipv6_net);
+	if (msg->ipv6_prefix == 0) {
 		READ_RAW_NUMERIC("ipv6-prefix", msg->ipv6_prefix, msg->has_ipv6_prefix);
+	} else {
+		msg->has_ipv6_prefix = 1;
+	}
+
 	if (msg->has_ipv6_prefix != 0) {
 		if (valid_ipv6_prefix(msg->ipv6_prefix) == 0) {
 			syslog(LOG_ERR, "unknown ipv6-prefix '%u' in %s", prefix, file);

src/vpn.h

@@ -317,6 +317,7 @@ struct main_server_st;
 
 #include <tun.h>
 
+unsigned extract_prefix(char *network);
 char *human_addr2(const struct sockaddr *sa, socklen_t salen,
 		       void *buf, size_t buflen, unsigned full);