Add "network" command to list or switch networks.

bash_completion.d/tinc

@@ -5,7 +5,7 @@ _tinc() {
 	prev="${COMP_WORDS[COMP_CWORD-1]}"
 	opts="-c -d -D -K -n -o -L -R -U --config --no-detach --debug --net --option --mlock --logfile --pidfile --chroot --user --help --version"
 	confvars="Address AddressFamily BindToAddress BindToInterface Broadcast Cipher ClampMSS Compression ConnectTo DecrementTTL Device DeviceType Digest DirectOnly ECDSAPrivateKeyFile ECDSAPublicKey ECDSAPublicKeyFile ExperimentalProtocol Forwarding GraphDumpFile Hostnames IffOneQueue IndirectData Interface KeyExpire ListenAddress LocalDiscovery MACExpire MACLength MaxOutputBufferSize MaxTimeout Mode Name PMTU PMTUDiscovery PingInterval PingTimeout Port PriorityInheritance PrivateKeyFile ProcessPriority Proxy PublicKeyFile ReplayWindow StrictSubnets Subnet TCPOnly TunnelServer UDPRcvBuf UDPSndBuf VDEGroup VDEPort Weight"
-	commands="add connect debug del disconnect dump edit export export-all generate-ecdsa-keys generate-keys generate-rsa-keys get help import info init invite join log pcap pid purge reload restart retry set start stop top version"
+	commands="add connect debug del disconnect dump edit export export-all generate-ecdsa-keys generate-keys generate-rsa-keys get help import info init invite join log network pcap pid purge reload restart retry set start stop top version"
 
 	case ${prev} in
 		-c|--config)
@@ -61,6 +61,18 @@ _tinc() {
 		COMPREPLY=( $(compgen -W "reachable nodes edges subnets connections graph" -- ${cur}) )
 		return 0
 		;;
+		network)
+		nets=""
+		pushd /etc/tinc >/dev/null 2>/dev/null
+		for dir in *; do
+			if [[ -f "$dir/tinc.conf" ]]; then
+				nets="$nets $dir"
+			fi
+		done
+		popd >/dev/null 2>/dev/null
+		COMPREPLY=( $(compgen -W "${nets}" -- ${cur}) )
+		return 0
+		;;
 	esac
 	if [[ -z ${cur} ]] ; then 
 		COMPREPLY=( $(compgen -W "${opts} ${commands}" -- ${cur}) )

doc/tinc.8.in

@@ -210,6 +210,11 @@ format to standard output,
 from where it can be redirected to a file or piped through a program that can parse it directly,
 such as
 .Xr tcpdump 8 .
+.It network Op Ar netname
+If
+.Ar netname
+is given, switch to that network.
+Otherwise, display a list of all networks for which configuration files exist.
 .El
 .Sh EXAMPLES
 Examples of some commands:

doc/tinc.texi

@@ -2399,6 +2399,11 @@ Dump VPN traffic going through the local tinc node in pcap-savefile format to st
 from where it can be redirected to a file or piped through a program that can parse it directly,
 such as tcpdump.
 
+@cindex network [@var{netname}]
+@item network
+If @var{netname} is given, switch to that network.
+Otherwise, display a list of all networks for which configuration files exist.
+
 @end table
 
 @c ==================================================================

src/tincctl.c

@@ -67,6 +67,7 @@ bool confbasegiven = false;
 bool netnamegiven = false;
 char *scriptinterpreter = NULL;
 char *scriptextension = "";
+static char *prompt;
 
 static struct option const long_options[] = {
 	{"config", required_argument, NULL, 'c'},
@@ -137,6 +138,7 @@ static void usage(bool status) {
 				"  exchange-all [--force]     Same as export-all followed by import\n"
 				"  invite NODE [...]          Generate an invitation for NODE\n"
 				"  join INVITATION            Join a VPN using an INVITIATION\n"
+				"  network [NETNAME]          List all known networks, or switch to the one named NETNAME.\n"
 				"\n");
 		printf("Report bugs to tinc@tinc-vpn.org.\n");
 	}
@@ -2066,6 +2068,70 @@ static int cmd_exchange_all(int argc, char *argv[]) {
 	return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
 }
 
+static int switch_network(char *name) {
+	if(fd >= 0) {
+		close(fd);
+		fd = -1;
+	}
+
+	free(confbase);
+	confbase = NULL;
+	free(pidfilename);
+	pidfilename = NULL;
+	free(logfilename);
+	logfilename = NULL;
+	free(unixsocketname);
+	unixsocketname = NULL;
+	free(tinc_conf);
+	free(hosts_dir);
+	free(prompt);
+
+	free(netname);
+	netname = strcmp(name, ".") ? xstrdup(name) : NULL;
+
+	make_names();
+        xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
+        xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
+	xasprintf(&prompt, "%s> ", identname);
+
+	return 0;
+}
+
+static int cmd_network(int argc, char *argv[]) {
+	if(argc > 2) {
+		fprintf(stderr, "Too many arguments!\n");
+		return 1;
+	}
+
+	if(argc == 2)
+		return switch_network(argv[1]);
+
+	DIR *dir = opendir(confdir);
+	if(!dir) {
+		fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno));
+                return 1;
+        }
+
+	struct dirent *ent;
+	while((ent = readdir(dir))) {
+		if(*ent->d_name == '.')
+			continue;
+
+		if(!strcmp(ent->d_name, "tinc.conf")) {
+			printf(".\n");
+			continue;
+		}
+
+		char *fname;
+		xasprintf(&fname, "%s/%s/tinc.conf", confdir, ent->d_name);
+		if(!access(fname, R_OK))
+			printf("%s\n", ent->d_name);
+		free(fname);
+	}
+
+	return 0;
+}
+
 static const struct {
 	const char *command;
 	int (*function)(int argc, char *argv[]);
@@ -2105,6 +2171,7 @@ static const struct {
 	{"exchange-all", cmd_exchange_all},
 	{"invite", cmd_invite},
 	{"join", cmd_join},
+	{"network", cmd_network},
 	{NULL, NULL},
 };
 
@@ -2231,7 +2298,6 @@ static char **completion (const char *text, int start, int end) {
 #endif
 
 static int cmd_shell(int argc, char *argv[]) {
-	char *prompt;
 	xasprintf(&prompt, "%s> ", identname);
 	int result = 0;
 	char buf[4096];