2 tincctl.c -- Controlling a running tincd
3 Copyright (C) 2007-2011 Guus Sliepen <guus@tinc-vpn.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include "control_common.h"
32 /* The name this program was run with. */
33 char *program_name = NULL;
35 /* If nonzero, display usage information and exit. */
36 bool show_help = false;
38 /* If nonzero, print the version on standard output and exit. */
39 bool show_version = false;
41 /* If nonzero, it will attempt to kill a running tincd and exit. */
44 /* If nonzero, generate public/private keypair for this host/net. */
45 int generate_keys = 0;
47 static char *name = NULL;
48 static char *identname = NULL; /* program name for syslog */
49 static char *controlcookiename = NULL; /* cookie file location */
50 static char controlcookie[1024];
52 char *confbase = NULL;
55 static struct WSAData wsa_state;
58 static struct option const long_options[] = {
59 {"config", required_argument, NULL, 'c'},
60 {"net", required_argument, NULL, 'n'},
61 {"help", no_argument, NULL, 1},
62 {"version", no_argument, NULL, 2},
63 {"controlcookie", required_argument, NULL, 5},
67 static void usage(bool status) {
69 fprintf(stderr, "Try `%s --help\' for more information.\n",
72 printf("Usage: %s [options] command\n\n", program_name);
73 printf("Valid options are:\n"
74 " -c, --config=DIR Read configuration options from DIR.\n"
75 " -n, --net=NETNAME Connect to net NETNAME.\n"
76 " --controlcookie=FILENAME Read control socket from FILENAME.\n"
77 " --help Display this help and exit.\n"
78 " --version Output version information and exit.\n"
80 "Valid commands are:\n"
81 " start Start tincd.\n"
83 " restart Restart tincd.\n"
84 " reload Reload configuration of running tincd.\n"
85 " pid Show PID of currently running tincd.\n"
86 " generate-keys [bits] Generate a new public/private keypair.\n"
87 " dump Dump a list of one of the following things:\n"
88 " nodes - all known nodes in the VPN\n"
89 " edges - all known connections in the VPN\n"
90 " subnets - all known subnets in the VPN\n"
91 " connections - all meta connections with ourself\n"
92 " graph - graph of the VPN in dotty format\n"
93 " purge Purge unreachable nodes\n"
94 " debug N Set debug level\n"
95 " retry Retry all outgoing connections\n"
96 " reload Partial reload of configuration\n"
97 " disconnect NODE Close meta connection with NODE\n"
99 " top Show real-time statistics\n"
101 " pcap Dump traffic in pcap format\n"
103 printf("Report bugs to tinc@tinc-vpn.org.\n");
107 static bool parse_options(int argc, char **argv) {
109 int option_index = 0;
111 while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
113 case 0: /* long option */
116 case 'c': /* config file */
117 confbase = xstrdup(optarg);
120 case 'n': /* net name given */
121 netname = xstrdup(optarg);
124 case 1: /* show help */
128 case 2: /* show version */
132 case 5: /* open control socket here */
133 controlcookiename = xstrdup(optarg);
148 FILE *ask_and_open(const char *filename, const char *what, const char *mode) {
155 /* Check stdin and stdout */
156 if(isatty(0) && isatty(1)) {
157 /* Ask for a file and/or directory name. */
158 fprintf(stdout, "Please enter a file to save %s to [%s]: ",
162 if(fgets(buf, sizeof buf, stdin) < 0) {
163 fprintf(stderr, "Error while reading stdin: %s\n",
177 if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
179 if(filename[0] != '/') {
181 /* The directory is a relative path or a filename. */
182 directory = get_current_dir_name();
183 snprintf(buf2, sizeof buf2, "%s/%s", directory, filename);
187 umask(0077); /* Disallow everything for group and other */
189 /* Open it first to keep the inode busy */
191 r = fopen(filename, mode);
194 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
202 Generate a public/private RSA keypair, and ask for a file to store
205 static bool keygen(int bits) {
210 fprintf(stderr, "Generating %d bits keys:\n", bits);
212 if(!rsa_generate(&key, bits, 0x10001)) {
213 fprintf(stderr, "Error during key generation!\n");
216 fprintf(stderr, "Done.\n");
218 xasprintf(&filename, "%s/rsa_key.priv", confbase);
219 f = ask_and_open(filename, "private RSA key", "a");
225 /* Make it unreadable for others. */
226 fchmod(fileno(f), 0600);
230 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
232 rsa_write_pem_private_key(&key, f);
238 xasprintf(&filename, "%s/hosts/%s", confbase, name);
240 xasprintf(&filename, "%s/rsa_key.pub", confbase);
242 f = ask_and_open(filename, "public RSA key", "a");
248 fprintf(stderr, "Appending key to existing contents.\nMake sure only one key is stored in the file.\n");
250 rsa_write_pem_public_key(&key, f);
259 Set all files and paths according to netname
261 static void make_names(void) {
264 char installdir[1024] = "";
265 long len = sizeof installdir;
269 xasprintf(&identname, "tinc.%s", netname);
271 identname = xstrdup("tinc");
274 if(!RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\tinc", 0, KEY_READ, &key)) {
275 if(!RegQueryValueEx(key, NULL, 0, 0, installdir, &len)) {
278 xasprintf(&confbase, "%s/%s", installdir, netname);
280 xasprintf(&confbase, "%s", installdir);
283 if(!controlcookiename)
284 xasprintf(&controlcookiename, "%s/cookie", confbase);
291 if(!controlcookiename)
292 xasprintf(&controlcookiename, "%s/run/%s.cookie", LOCALSTATEDIR, identname);
296 xasprintf(&confbase, CONFDIR "/tinc/%s", netname);
298 fprintf(stderr, "Both netname and configuration directory given, using the latter...\n");
301 xasprintf(&confbase, CONFDIR "/tinc");
305 static char buffer[4096];
306 static size_t blen = 0;
308 bool recvline(int fd, char *line, size_t len) {
309 char *newline = NULL;
311 while(!(newline = memchr(buffer, '\n', blen))) {
312 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
313 if(result == -1 && errno == EINTR)
320 if(newline - buffer >= len)
323 len = newline - buffer;
325 memcpy(line, buffer, len);
327 memmove(buffer, newline + 1, blen - len - 1);
333 bool recvdata(int fd, char *data, size_t len) {
335 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
336 if(result == -1 && errno == EINTR)
343 memcpy(data, buffer, len);
344 memmove(buffer, buffer + len, blen - len);
350 bool sendline(int fd, char *format, ...) {
351 static char buffer[4096];
356 va_start(ap, format);
357 blen = vsnprintf(buffer, sizeof buffer, format, ap);
360 if(blen < 0 || blen >= sizeof buffer)
367 int result = send(fd, p, blen, 0);
368 if(result == -1 && errno == EINTR)
370 else if(result <= 0);
379 void pcap(int fd, FILE *out) {
380 sendline(fd, "%d %d", CONTROL, REQ_PCAP);
388 uint32_t tz_accuracy;
408 fwrite(&header, sizeof header, 1, out);
412 while(recvline(fd, line, sizeof line)) {
414 int n = sscanf(line, "%d %d %d", &code, &req, &len);
415 gettimeofday(&tv, NULL);
416 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
418 if(!recvdata(fd, data, len))
420 packet.tv_sec = tv.tv_sec;
421 packet.tv_usec = tv.tv_usec;
423 packet.origlen = len;
424 fwrite(&packet, sizeof packet, 1, out);
425 fwrite(data, len, 1, out);
430 int main(int argc, char *argv[], char *envp[]) {
436 program_name = argv[0];
438 if(!parse_options(argc, argv))
444 printf("%s version %s (built %s %s, protocol %d)\n", PACKAGE,
445 VERSION, __DATE__, __TIME__, PROT_CURRENT);
446 printf("Copyright (C) 1998-2009 Ivo Timmermans, Guus Sliepen and others.\n"
447 "See the AUTHORS file for a complete list.\n\n"
448 "tinc comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
449 "and you are welcome to redistribute it under certain conditions;\n"
450 "see the file COPYING for details.\n");
461 fprintf(stderr, "Not enough arguments.\n");
466 // First handle commands that don't involve connecting to a running tinc daemon.
468 if(!strcasecmp(argv[optind], "generate-keys")) {
469 return !keygen(optind > argc ? atoi(argv[optind + 1]) : 2048);
472 if(!strcasecmp(argv[optind], "start")) {
474 execve(SBINDIR "/tincd", argv, envp);
475 fprintf(stderr, "Could not start tincd: %s", strerror(errno));
480 * Now handle commands that do involve connecting to a running tinc daemon.
481 * Authenticate the server by ensuring the parent directory can be
482 * traversed only by root. Note this is not totally race-free unless all
483 * ancestors are writable only by trusted users, which we don't verify.
486 FILE *f = fopen(controlcookiename, "r");
488 fprintf(stderr, "Could not open control socket cookie file %s: %s\n", controlcookiename, strerror(errno));
491 if(fscanf(f, "%1024s %d %d", controlcookie, &port, &pid) != 3) {
492 fprintf(stderr, "Could not parse control socket cookie file %s\n", controlcookiename);
497 if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
498 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
503 struct sockaddr_in addr;
504 memset(&addr, 0, sizeof addr);
505 addr.sin_family = AF_INET;
506 addr.sin_addr.s_addr = htonl(0x7f000001);
507 addr.sin_port = htons(port);
509 fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
511 fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
516 unsigned long arg = 0;
518 if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
519 fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
523 if(connect(fd, (struct sockaddr *)&addr, sizeof addr) < 0) {
525 fprintf(stderr, "Cannot connect to %s: %s\n", controlcookiename, sockstrerror(sockerrno));
531 int code, version, req;
533 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
534 fprintf(stderr, "Cannot read greeting from control socket: %s\n",
535 sockstrerror(sockerrno));
539 sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
541 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
542 fprintf(stderr, "Could not fully establish control socket connection\n");
546 if(!strcasecmp(argv[optind], "pid")) {
551 if(!strcasecmp(argv[optind], "stop")) {
552 sendline(fd, "%d %d", CONTROL, REQ_STOP);
553 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_STOP || result) {
554 fprintf(stderr, "Could not stop tinc daemon\n");
560 if(!strcasecmp(argv[optind], "reload")) {
561 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
562 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
563 fprintf(stderr, "Could not reload tinc daemon\n");
569 if(!strcasecmp(argv[optind], "restart")) {
570 sendline(fd, "%d %d", CONTROL, REQ_RESTART);
571 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RESTART || result) {
572 fprintf(stderr, "Could not restart tinc daemon\n");
578 if(!strcasecmp(argv[optind], "retry")) {
579 sendline(fd, "%d %d", CONTROL, REQ_RETRY);
580 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
581 fprintf(stderr, "Could not retry outgoing connections\n");
587 if(!strcasecmp(argv[optind], "dump")) {
588 if(argc < optind + 2) {
589 fprintf(stderr, "Not enough arguments.\n");
594 bool do_graph = false;
596 if(!strcasecmp(argv[optind+1], "nodes"))
597 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
598 else if(!strcasecmp(argv[optind+1], "edges"))
599 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
600 else if(!strcasecmp(argv[optind+1], "subnets"))
601 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
602 else if(!strcasecmp(argv[optind+1], "connections"))
603 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
604 else if(!strcasecmp(argv[optind+1], "graph")) {
605 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
606 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
608 printf("digraph {\n");
610 fprintf(stderr, "Unknown dump type '%s'.\n", argv[optind+1]);
615 while(recvline(fd, line, sizeof line)) {
616 char node1[4096], node2[4096];
617 int n = sscanf(line, "%d %d %s to %s", &code, &req, node1, node2);
619 if(do_graph && req == REQ_DUMP_NODES)
631 printf("%s\n", line + 5);
633 if(req == REQ_DUMP_NODES)
634 printf(" %s [label = \"%s\"];\n", node1, node1);
636 printf(" %s -> %s;\n", node1, node2);
640 fprintf(stderr, "Error receiving dump\n");
644 if(!strcasecmp(argv[optind], "purge")) {
645 sendline(fd, "%d %d", CONTROL, REQ_PURGE);
646 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
647 fprintf(stderr, "Could not purge tinc daemon\n");
653 if(!strcasecmp(argv[optind], "debug")) {
654 int debuglevel, origlevel;
656 if(argc != optind + 2) {
657 fprintf(stderr, "Invalid arguments.\n");
660 debuglevel = atoi(argv[optind+1]);
662 sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
663 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
664 fprintf(stderr, "Could not purge tinc daemon\n");
668 fprintf(stderr, "Old level %d, new level %d\n", origlevel, debuglevel);
672 if(!strcasecmp(argv[optind], "connect")) {
673 if(argc != optind + 2) {
674 fprintf(stderr, "Invalid arguments.\n");
677 char *name = argv[optind + 1];
679 sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, name);
680 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
681 fprintf(stderr, "Could not connect to %s\n", name);
687 if(!strcasecmp(argv[optind], "disconnect")) {
688 if(argc != optind + 2) {
689 fprintf(stderr, "Invalid arguments.\n");
692 char *name = argv[optind + 1];
694 sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, name);
695 if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
696 fprintf(stderr, "Could not disconnect %s\n", name);
703 if(!strcasecmp(argv[optind], "top")) {
709 if(!strcasecmp(argv[optind], "pcap")) {
714 fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);