Merge remote-tracking branch 'groxxda/gui-fixes' into 1.1
[tinc] / src / tincctl.c
1 /*
2     tincctl.c -- Controlling a running tincd
3     Copyright (C) 2007-2014 Guus Sliepen <guus@tinc-vpn.org>
4
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.
9
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.
14
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.
18 */
19
20 #include "system.h"
21
22 #include <getopt.h>
23
24 #ifdef HAVE_READLINE
25 #include "readline/readline.h"
26 #include "readline/history.h"
27 #endif
28
29 #include "xalloc.h"
30 #include "protocol.h"
31 #include "control_common.h"
32 #include "crypto.h"
33 #include "ecdsagen.h"
34 #include "info.h"
35 #include "invitation.h"
36 #include "names.h"
37 #include "rsagen.h"
38 #include "utils.h"
39 #include "tincctl.h"
40 #include "top.h"
41 #include "version.h"
42
43 #ifndef MSG_NOSIGNAL
44 #define MSG_NOSIGNAL 0
45 #endif
46
47 static char **orig_argv;
48 static int orig_argc;
49
50 /* If nonzero, display usage information and exit. */
51 static bool show_help = false;
52
53 /* If nonzero, print the version on standard output and exit.  */
54 static bool show_version = false;
55
56 static char *name = NULL;
57 static char controlcookie[1025];
58 char *tinc_conf = NULL;
59 char *hosts_dir = NULL;
60 struct timeval now;
61
62 // Horrible global variables...
63 static int pid = 0;
64 int fd = -1;
65 char line[4096];
66 static int code;
67 static int req;
68 static int result;
69 static bool force = false;
70 bool tty = true;
71 bool confbasegiven = false;
72 bool netnamegiven = false;
73 char *scriptinterpreter = NULL;
74 char *scriptextension = "";
75 static char *prompt;
76
77 static struct option const long_options[] = {
78         {"batch", no_argument, NULL, 'b'},
79         {"config", required_argument, NULL, 'c'},
80         {"net", required_argument, NULL, 'n'},
81         {"help", no_argument, NULL, 1},
82         {"version", no_argument, NULL, 2},
83         {"pidfile", required_argument, NULL, 3},
84         {"force", no_argument, NULL, 4},
85         {NULL, 0, NULL, 0}
86 };
87
88 static void version(void) {
89         printf("%s version %s (built %s %s, protocol %d.%d)\n", PACKAGE,
90                    VERSION, BUILD_DATE, BUILD_TIME, PROT_MAJOR, PROT_MINOR);
91         printf("Copyright (C) 1998-2012 Ivo Timmermans, Guus Sliepen and others.\n"
92                         "See the AUTHORS file for a complete list.\n\n"
93                         "tinc comes with ABSOLUTELY NO WARRANTY.  This is free software,\n"
94                         "and you are welcome to redistribute it under certain conditions;\n"
95                         "see the file COPYING for details.\n");
96 }
97
98 static void usage(bool status) {
99         if(status) {
100                 fprintf(stderr, "Try `%s --help\' for more information.\n", program_name);
101         } else {
102                 printf("Usage: %s [options] command\n\n", program_name);
103                 printf("Valid options are:\n"
104                                 "  -b, --batch             Don't ask for anything (non-interactive mode).\n"
105                                 "  -c, --config=DIR        Read configuration options from DIR.\n"
106                                 "  -n, --net=NETNAME       Connect to net NETNAME.\n"
107                                 "      --pidfile=FILENAME  Read control cookie from FILENAME.\n"
108                                 "      --help              Display this help and exit.\n"
109                                 "      --version           Output version information and exit.\n"
110                                 "\n"
111                                 "Valid commands are:\n"
112                                 "  init [name]                Create initial configuration files.\n"
113                                 "  get VARIABLE               Print current value of VARIABLE\n"
114                                 "  set VARIABLE VALUE         Set VARIABLE to VALUE\n"
115                                 "  add VARIABLE VALUE         Add VARIABLE with the given VALUE\n"
116                                 "  del VARIABLE [VALUE]       Remove VARIABLE [only ones with watching VALUE]\n"
117                                 "  start [tincd options]      Start tincd.\n"
118                                 "  stop                       Stop tincd.\n"
119                                 "  restart [tincd options]    Restart tincd.\n"
120                                 "  reload                     Partially reload configuration of running tincd.\n"
121                                 "  pid                        Show PID of currently running tincd.\n"
122                                 "  generate-keys [bits]       Generate new RSA and Ed25519 public/private keypairs.\n"
123                                 "  generate-rsa-keys [bits]   Generate a new RSA public/private keypair.\n"
124                                 "  generate-ed25519-keys      Generate a new Ed25519 public/private keypair.\n"
125                                 "  dump                       Dump a list of one of the following things:\n"
126                                 "    [reachable] nodes        - all known nodes in the VPN\n"
127                                 "    edges                    - all known connections in the VPN\n"
128                                 "    subnets                  - all known subnets in the VPN\n"
129                                 "    connections              - all meta connections with ourself\n"
130                                 "    [di]graph                - graph of the VPN in dotty format\n"
131                                 "  info NODE|SUBNET|ADDRESS   Give information about a particular NODE, SUBNET or ADDRESS.\n"
132                                 "  purge                      Purge unreachable nodes\n"
133                                 "  debug N                    Set debug level\n"
134                                 "  retry                      Retry all outgoing connections\n"
135                                 "  disconnect NODE            Close meta connection with NODE\n"
136 #ifdef HAVE_CURSES
137                                 "  top                        Show real-time statistics\n"
138 #endif
139                                 "  pcap [snaplen]             Dump traffic in pcap format [up to snaplen bytes per packet]\n"
140                                 "  log [level]                Dump log output [up to the specified level]\n"
141                                 "  export                     Export host configuration of local node to standard output\n"
142                                 "  export-all                 Export all host configuration files to standard output\n"
143                                 "  import [--force]           Import host configuration file(s) from standard input\n"
144                                 "  exchange [--force]         Same as export followed by import\n"
145                                 "  exchange-all [--force]     Same as export-all followed by import\n"
146                                 "  invite NODE [...]          Generate an invitation for NODE\n"
147                                 "  join INVITATION            Join a VPN using an INVITIATION\n"
148                                 "  network [NETNAME]          List all known networks, or switch to the one named NETNAME.\n"
149                                 "\n");
150                 printf("Report bugs to tinc@tinc-vpn.org.\n");
151         }
152 }
153
154 static bool parse_options(int argc, char **argv) {
155         int r;
156         int option_index = 0;
157
158         while((r = getopt_long(argc, argv, "+c:n:", long_options, &option_index)) != EOF) {
159                 switch (r) {
160                         case 0:   /* long option */
161                                 break;
162
163                         case 'b':
164                                 tty = false;
165                                 break;
166
167                         case 'c': /* config file */
168                                 confbase = xstrdup(optarg);
169                                 confbasegiven = true;
170                                 break;
171
172                         case 'n': /* net name given */
173                                 netname = xstrdup(optarg);
174                                 break;
175
176                         case 1:   /* show help */
177                                 show_help = true;
178                                 break;
179
180                         case 2:   /* show version */
181                                 show_version = true;
182                                 break;
183
184                         case 3:   /* open control socket here */
185                                 pidfilename = xstrdup(optarg);
186                                 break;
187
188                         case 4:   /* force */
189                                 force = true;
190                                 break;
191
192                         case '?': /* wrong options */
193                                 usage(true);
194                                 return false;
195
196                         default:
197                                 break;
198                 }
199         }
200
201         if(!netname && (netname = getenv("NETNAME")))
202                 netname = xstrdup(netname);
203
204         /* netname "." is special: a "top-level name" */
205
206         if(netname && (!*netname || !strcmp(netname, "."))) {
207                 free(netname);
208                 netname = NULL;
209         }
210
211         if(netname && (strpbrk(netname, "\\/") || *netname == '.')) {
212                 fprintf(stderr, "Invalid character in netname!\n");
213                 return false;
214         }
215
216         return true;
217 }
218
219 /* Open a file with the desired permissions, minus the umask.
220    Also, if we want to create an executable file, we call fchmod()
221    to set the executable bits. */
222
223 FILE *fopenmask(const char *filename, const char *mode, mode_t perms) {
224         mode_t mask = umask(0);
225         perms &= ~mask;
226         umask(~perms);
227         FILE *f = fopen(filename, mode);
228 #ifdef HAVE_FCHMOD
229         if((perms & 0444) && f)
230                 fchmod(fileno(f), perms);
231 #endif
232         umask(mask);
233         return f;
234 }
235
236 static void disable_old_keys(const char *filename, const char *what) {
237         char tmpfile[PATH_MAX] = "";
238         char buf[1024];
239         bool disabled = false;
240         bool block = false;
241         bool error = false;
242         FILE *r, *w;
243
244         r = fopen(filename, "r");
245         if(!r)
246                 return;
247
248         snprintf(tmpfile, sizeof tmpfile, "%s.tmp", filename);
249
250         struct stat st = {.st_mode = 0600};
251         fstat(fileno(r), &st);
252         w = fopenmask(tmpfile, "w", st.st_mode);
253
254         while(fgets(buf, sizeof buf, r)) {
255                 if(!block && !strncmp(buf, "-----BEGIN ", 11)) {
256                         if((strstr(buf, " ED25519 ") && strstr(what, "Ed25519")) || (strstr(buf, " RSA ") && strstr(what, "RSA"))) {
257                                 disabled = true;
258                                 block = true;
259                         }
260                 }
261
262                 bool ed25519pubkey = !strncasecmp(buf, "Ed25519PublicKey", 16) && strchr(" \t=", buf[16]) && strstr(what, "Ed25519");
263
264                 if(ed25519pubkey)
265                         disabled = true;
266
267                 if(w) {
268                         if(block || ed25519pubkey)
269                                 fputc('#', w);
270                         if(fputs(buf, w) < 0) {
271                                 error = true;
272                                 break;
273                         }
274                 }
275
276                 if(block && !strncmp(buf, "-----END ", 9))
277                         block = false;
278         }
279
280         if(w)
281                 if(fclose(w) < 0)
282                         error = true;
283         if(ferror(r) || fclose(r) < 0)
284                 error = true;
285
286         if(disabled) {
287                 if(!w || error) {
288                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
289                         if(w)
290                                 unlink(tmpfile);
291                         return;
292                 }
293
294 #ifdef HAVE_MINGW
295                 // We cannot atomically replace files on Windows.
296                 char bakfile[PATH_MAX] = "";
297                 snprintf(bakfile, sizeof bakfile, "%s.bak", filename);
298                 if(rename(filename, bakfile) || rename(tmpfile, filename)) {
299                         rename(bakfile, filename);
300 #else
301                 if(rename(tmpfile, filename)) {
302 #endif
303                         fprintf(stderr, "Warning: old key(s) found, remove them by hand!\n");
304                 } else  {
305 #ifdef HAVE_MINGW
306                         unlink(bakfile);
307 #endif
308                         fprintf(stderr, "Warning: old key(s) found and disabled.\n");
309                 }
310         }
311
312         unlink(tmpfile);
313 }
314
315 static FILE *ask_and_open(const char *filename, const char *what, const char *mode, bool ask, mode_t perms) {
316         FILE *r;
317         char *directory;
318         char buf[PATH_MAX];
319         char buf2[PATH_MAX];
320
321         /* Check stdin and stdout */
322         if(ask && tty) {
323                 /* Ask for a file and/or directory name. */
324                 fprintf(stderr, "Please enter a file to save %s to [%s]: ", what, filename);
325
326                 if(fgets(buf, sizeof buf, stdin) == NULL) {
327                         fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
328                         return NULL;
329                 }
330
331                 size_t len = strlen(buf);
332                 if(len)
333                         buf[--len] = 0;
334
335                 if(len)
336                         filename = buf;
337         }
338
339 #ifdef HAVE_MINGW
340         if(filename[0] != '\\' && filename[0] != '/' && !strchr(filename, ':')) {
341 #else
342         if(filename[0] != '/') {
343 #endif
344                 /* The directory is a relative path or a filename. */
345                 directory = get_current_dir_name();
346                 snprintf(buf2, sizeof buf2, "%s" SLASH "%s", directory, filename);
347                 filename = buf2;
348         }
349
350         disable_old_keys(filename, what);
351
352         /* Open it first to keep the inode busy */
353
354         r = fopenmask(filename, mode, perms);
355
356         if(!r) {
357                 fprintf(stderr, "Error opening file `%s': %s\n", filename, strerror(errno));
358                 return NULL;
359         }
360
361         return r;
362 }
363
364 /*
365   Generate a public/private Ed25519 keypair, and ask for a file to store
366   them in.
367 */
368 static bool ed25519_keygen(bool ask) {
369         ecdsa_t *key;
370         FILE *f;
371         char *pubname, *privname;
372
373         fprintf(stderr, "Generating Ed25519 keypair:\n");
374
375         if(!(key = ecdsa_generate())) {
376                 fprintf(stderr, "Error during key generation!\n");
377                 return false;
378         } else
379                 fprintf(stderr, "Done.\n");
380
381         xasprintf(&privname, "%s" SLASH "ed25519_key.priv", confbase);
382         f = ask_and_open(privname, "private Ed25519 key", "a", ask, 0600);
383         free(privname);
384
385         if(!f)
386                 return false;
387
388         if(!ecdsa_write_pem_private_key(key, f)) {
389                 fprintf(stderr, "Error writing private key!\n");
390                 ecdsa_free(key);
391                 fclose(f);
392                 return false;
393         }
394
395         fclose(f);
396
397         if(name)
398                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
399         else
400                 xasprintf(&pubname, "%s" SLASH "ed25519_key.pub", confbase);
401
402         f = ask_and_open(pubname, "public Ed25519 key", "a", ask, 0666);
403         free(pubname);
404
405         if(!f)
406                 return false;
407
408         char *pubkey = ecdsa_get_base64_public_key(key);
409         fprintf(f, "Ed25519PublicKey = %s\n", pubkey);
410         free(pubkey);
411
412         fclose(f);
413         ecdsa_free(key);
414
415         return true;
416 }
417
418 /*
419   Generate a public/private RSA keypair, and ask for a file to store
420   them in.
421 */
422 static bool rsa_keygen(int bits, bool ask) {
423         rsa_t *key;
424         FILE *f;
425         char *pubname, *privname;
426
427         // Make sure the key size is a multiple of 8 bits.
428         bits &= ~0x7;
429
430         // Force them to be between 1024 and 8192 bits long.
431         if(bits < 1024)
432                 bits = 1024;
433         if(bits > 8192)
434                 bits = 8192;
435
436         fprintf(stderr, "Generating %d bits keys:\n", bits);
437
438         if(!(key = rsa_generate(bits, 0x10001))) {
439                 fprintf(stderr, "Error during key generation!\n");
440                 return false;
441         } else
442                 fprintf(stderr, "Done.\n");
443
444         xasprintf(&privname, "%s" SLASH "rsa_key.priv", confbase);
445         f = ask_and_open(privname, "private RSA key", "a", ask, 0600);
446         free(privname);
447
448         if(!f)
449                 return false;
450
451         if(!rsa_write_pem_private_key(key, f)) {
452                 fprintf(stderr, "Error writing private key!\n");
453                 fclose(f);
454                 rsa_free(key);
455                 return false;
456         }
457
458         fclose(f);
459
460         if(name)
461                 xasprintf(&pubname, "%s" SLASH "hosts" SLASH "%s", confbase, name);
462         else
463                 xasprintf(&pubname, "%s" SLASH "rsa_key.pub", confbase);
464
465         f = ask_and_open(pubname, "public RSA key", "a", ask, 0666);
466         free(pubname);
467
468         if(!f)
469                 return false;
470
471         if(!rsa_write_pem_public_key(key, f)) {
472                 fprintf(stderr, "Error writing public key!\n");
473                 fclose(f);
474                 rsa_free(key);
475                 return false;
476         }
477
478         fclose(f);
479         rsa_free(key);
480
481         return true;
482 }
483
484 char buffer[4096];
485 size_t blen = 0;
486
487 bool recvline(int fd, char *line, size_t len) {
488         char *newline = NULL;
489
490         if(!fd)
491                 abort();
492
493         while(!(newline = memchr(buffer, '\n', blen))) {
494                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
495                 if(result == -1 && sockerrno == EINTR)
496                         continue;
497                 else if(result <= 0)
498                         return false;
499                 blen += result;
500         }
501
502         if(newline - buffer >= len)
503                 return false;
504
505         len = newline - buffer;
506
507         memcpy(line, buffer, len);
508         line[len] = 0;
509         memmove(buffer, newline + 1, blen - len - 1);
510         blen -= len + 1;
511
512         return true;
513 }
514
515 bool recvdata(int fd, char *data, size_t len) {
516         if(len == -1)
517                 len = blen;
518
519         while(blen < len) {
520                 int result = recv(fd, buffer + blen, sizeof buffer - blen, 0);
521                 if(result == -1 && sockerrno == EINTR)
522                         continue;
523                 else if(result <= 0)
524                         return false;
525                 blen += result;
526         }
527
528         memcpy(data, buffer, len);
529         memmove(buffer, buffer + len, blen - len);
530         blen -= len;
531
532         return true;
533 }
534
535 bool sendline(int fd, char *format, ...) {
536         static char buffer[4096];
537         char *p = buffer;
538         int blen = 0;
539         va_list ap;
540
541         va_start(ap, format);
542         blen = vsnprintf(buffer, sizeof buffer, format, ap);
543         va_end(ap);
544
545         if(blen < 1 || blen >= sizeof buffer)
546                 return false;
547
548         buffer[blen] = '\n';
549         blen++;
550
551         while(blen) {
552                 int result = send(fd, p, blen, MSG_NOSIGNAL);
553                 if(result == -1 && sockerrno == EINTR)
554                         continue;
555                 else if(result <= 0)
556                         return false;
557                 p += result;
558                 blen -= result;
559         }
560
561         return true;
562 }
563
564 static void pcap(int fd, FILE *out, int snaplen) {
565         sendline(fd, "%d %d %d", CONTROL, REQ_PCAP, snaplen);
566         char data[9018];
567
568         struct {
569                 uint32_t magic;
570                 uint16_t major;
571                 uint16_t minor;
572                 uint32_t tz_offset;
573                 uint32_t tz_accuracy;
574                 uint32_t snaplen;
575                 uint32_t ll_type;
576         } header = {
577                 0xa1b2c3d4,
578                 2, 4,
579                 0, 0,
580                 snaplen ?: sizeof data,
581                 1,
582         };
583
584         struct {
585                 uint32_t tv_sec;
586                 uint32_t tv_usec;
587                 uint32_t len;
588                 uint32_t origlen;
589         } packet;
590
591         struct timeval tv;
592
593         fwrite(&header, sizeof header, 1, out);
594         fflush(out);
595
596         char line[32];
597         while(recvline(fd, line, sizeof line)) {
598                 int code, req, len;
599                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
600                 gettimeofday(&tv, NULL);
601                 if(n != 3 || code != CONTROL || req != REQ_PCAP || len < 0 || len > sizeof data)
602                         break;
603                 if(!recvdata(fd, data, len))
604                         break;
605                 packet.tv_sec = tv.tv_sec;
606                 packet.tv_usec = tv.tv_usec;
607                 packet.len = len;
608                 packet.origlen = len;
609                 fwrite(&packet, sizeof packet, 1, out);
610                 fwrite(data, len, 1, out);
611                 fflush(out);
612         }
613 }
614
615 static void logcontrol(int fd, FILE *out, int level) {
616         sendline(fd, "%d %d %d", CONTROL, REQ_LOG, level);
617         char data[1024];
618         char line[32];
619
620         while(recvline(fd, line, sizeof line)) {
621                 int code, req, len;
622                 int n = sscanf(line, "%d %d %d", &code, &req, &len);
623                 if(n != 3 || code != CONTROL || req != REQ_LOG || len < 0 || len > sizeof data)
624                         break;
625                 if(!recvdata(fd, data, len))
626                         break;
627                 fwrite(data, len, 1, out);
628                 fputc('\n', out);
629                 fflush(out);
630         }
631 }
632
633 #ifdef HAVE_MINGW
634 static bool remove_service(void) {
635         SC_HANDLE manager = NULL;
636         SC_HANDLE service = NULL;
637         SERVICE_STATUS status = {0};
638
639         manager = OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
640         if(!manager) {
641                 fprintf(stderr, "Could not open service manager: %s\n", winerror(GetLastError()));
642                 return false;
643         }
644
645         service = OpenService(manager, identname, SERVICE_ALL_ACCESS);
646
647         if(!service) {
648                 fprintf(stderr, "Could not open %s service: %s\n", identname, winerror(GetLastError()));
649                 return false;
650         }
651
652         if(!ControlService(service, SERVICE_CONTROL_STOP, &status))
653                 fprintf(stderr, "Could not stop %s service: %s\n", identname, winerror(GetLastError()));
654         else
655                 fprintf(stderr, "%s service stopped\n", identname);
656
657         if(!DeleteService(service)) {
658                 fprintf(stderr, "Could not remove %s service: %s\n", identname, winerror(GetLastError()));
659                 return false;
660         }
661
662         fprintf(stderr, "%s service removed\n", identname);
663
664         return true;
665 }
666 #endif
667
668 bool connect_tincd(bool verbose) {
669         if(fd >= 0) {
670                 fd_set r;
671                 FD_ZERO(&r);
672                 FD_SET(fd, &r);
673                 struct timeval tv = {0, 0};
674                 if(select(fd + 1, &r, NULL, NULL, &tv)) {
675                         fprintf(stderr, "Previous connection to tincd lost, reconnecting.\n");
676                         close(fd);
677                         fd = -1;
678                 } else {
679                         return true;
680                 }
681         }
682
683         FILE *f = fopen(pidfilename, "r");
684         if(!f) {
685                 if(verbose)
686                         fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
687                 return false;
688         }
689
690         char host[129];
691         char port[129];
692
693         if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
694                 if(verbose)
695                         fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
696                 fclose(f);
697                 return false;
698         }
699
700         fclose(f);
701
702 #ifndef HAVE_MINGW
703         struct sockaddr_un sa;
704         sa.sun_family = AF_UNIX;
705         strncpy(sa.sun_path, unixsocketname, sizeof sa.sun_path);
706
707         fd = socket(AF_UNIX, SOCK_STREAM, 0);
708         if(fd < 0) {
709                 if(verbose)
710                         fprintf(stderr, "Cannot create UNIX socket: %s\n", sockstrerror(sockerrno));
711                 return false;
712         }
713
714         if(connect(fd, (struct sockaddr *)&sa, sizeof sa) < 0) {
715                 if(verbose)
716                         fprintf(stderr, "Cannot connect to UNIX socket %s: %s\n", unixsocketname, sockstrerror(sockerrno));
717                 close(fd);
718                 fd = -1;
719                 return false;
720         }
721 #else
722         struct addrinfo hints = {
723                 .ai_family = AF_UNSPEC,
724                 .ai_socktype = SOCK_STREAM,
725                 .ai_protocol = IPPROTO_TCP,
726                 .ai_flags = 0,
727         };
728
729         struct addrinfo *res = NULL;
730
731         if(getaddrinfo(host, port, &hints, &res) || !res) {
732                 if(verbose)
733                         fprintf(stderr, "Cannot resolve %s port %s: %s", host, port, sockstrerror(sockerrno));
734                 return false;
735         }
736
737         fd = socket(res->ai_family, SOCK_STREAM, IPPROTO_TCP);
738         if(fd < 0) {
739                 if(verbose)
740                         fprintf(stderr, "Cannot create TCP socket: %s\n", sockstrerror(sockerrno));
741                 return false;
742         }
743
744 #ifdef HAVE_MINGW
745         unsigned long arg = 0;
746
747         if(ioctlsocket(fd, FIONBIO, &arg) != 0) {
748                 if(verbose)
749                         fprintf(stderr, "ioctlsocket failed: %s", sockstrerror(sockerrno));
750         }
751 #endif
752
753         if(connect(fd, res->ai_addr, res->ai_addrlen) < 0) {
754                 if(verbose)
755                         fprintf(stderr, "Cannot connect to %s port %s: %s\n", host, port, sockstrerror(sockerrno));
756                 close(fd);
757                 fd = -1;
758                 return false;
759         }
760
761         freeaddrinfo(res);
762 #endif
763
764 #ifdef SO_NOSIGPIPE
765         static const int one = 1;
766         setsockopt(fd, SOL_SOCKET, SO_NOSIGPIPE, (void *)&one, sizeof one);
767 #endif
768
769         char data[4096];
770         int version;
771
772         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %s %d", &code, data, &version) != 3 || code != 0) {
773                 if(verbose)
774                         fprintf(stderr, "Cannot read greeting from control socket: %s\n", sockstrerror(sockerrno));
775                 close(fd);
776                 fd = -1;
777                 return false;
778         }
779
780         sendline(fd, "%d ^%s %d", ID, controlcookie, TINC_CTL_VERSION_CURRENT);
781
782         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &version, &pid) != 3 || code != 4 || version != TINC_CTL_VERSION_CURRENT) {
783                 if(verbose)
784                         fprintf(stderr, "Could not fully establish control socket connection\n");
785                 close(fd);
786                 fd = -1;
787                 return false;
788         }
789
790         return true;
791 }
792
793
794 static int cmd_start(int argc, char *argv[]) {
795         if(connect_tincd(false)) {
796                 if(netname)
797                         fprintf(stderr, "A tincd is already running for net `%s' with pid %d.\n", netname, pid);
798                 else
799                         fprintf(stderr, "A tincd is already running with pid %d.\n", pid);
800                 return 0;
801         }
802
803         char *c;
804         char *slash = strrchr(program_name, '/');
805
806 #ifdef HAVE_MINGW
807         if ((c = strrchr(program_name, '\\')) > slash)
808                 slash = c;
809 #endif
810
811         if (slash++)
812                 xasprintf(&c, "%.*stincd", (int)(slash - program_name), program_name);
813         else
814                 c = "tincd";
815
816         int nargc = 0;
817         char **nargv = xzalloc((optind + argc) * sizeof *nargv);
818
819         char *arg0 = c;
820 #ifdef HAVE_MINGW
821         /*
822            Windows has no real concept of an "argv array". A command line is just one string.
823            The CRT of the new process will decode the command line string to generate argv before calling main(), and (by convention)
824            it uses quotes to handle spaces in arguments.
825            Therefore we need to quote all arguments that might contain spaces. No, execvp() won't do that for us (see MSDN).
826            If we don't do that, then execvp() will run fine but any spaces in the filename contained in arg0 will bleed
827            into the next arguments when the spawned process' CRT parses its command line, resulting in chaos.
828         */
829         xasprintf(&arg0, "\"%s\"", arg0);
830 #endif
831         nargv[nargc++] = arg0;
832         for(int i = 1; i < optind; i++)
833                 nargv[nargc++] = orig_argv[i];
834         for(int i = 1; i < argc; i++)
835                 nargv[nargc++] = argv[i];
836
837 #ifdef HAVE_MINGW
838         int status = spawnvp(_P_WAIT, c, nargv);
839         if (status == -1) {
840                 fprintf(stderr, "Error starting %s: %s\n", c, strerror(errno));
841                 return 1;
842         }
843         return status;
844 #else
845         pid_t pid = fork();
846         if(pid == -1) {
847                 fprintf(stderr, "Could not fork: %s\n", strerror(errno));
848                 free(nargv);
849                 return 1;
850         }
851
852         if(!pid)
853                 exit(execvp(c, nargv));
854
855         free(nargv);
856
857         int status = -1, result;
858 #ifdef SIGINT
859         signal(SIGINT, SIG_IGN);
860 #endif
861         result = waitpid(pid, &status, 0);
862 #ifdef SIGINT
863         signal(SIGINT, SIG_DFL);
864 #endif
865
866         if(result != pid || !WIFEXITED(status) || WEXITSTATUS(status)) {
867                 fprintf(stderr, "Error starting %s\n", c);
868                 return 1;
869         }
870
871         return 0;
872 #endif
873 }
874
875 static int cmd_stop(int argc, char *argv[]) {
876         if(argc > 1) {
877                 fprintf(stderr, "Too many arguments!\n");
878                 return 1;
879         }
880
881 #ifndef HAVE_MINGW
882         if(!connect_tincd(true)) {
883                 if(pid) {
884                         if(kill(pid, SIGTERM)) {
885                                 fprintf(stderr, "Could not send TERM signal to process with PID %u: %s\n", pid, strerror(errno));
886                                 return 1;
887                         }
888
889                         fprintf(stderr, "Sent TERM signal to process with PID %u.\n", pid);
890                         waitpid(pid, NULL, 0);
891                         return 0;
892                 }
893
894                 return 1;
895         }
896
897         sendline(fd, "%d %d", CONTROL, REQ_STOP);
898
899         while(recvline(fd, line, sizeof line)) {
900                 // Wait for tincd to close the connection...
901         }
902 #else
903         if(!remove_service())
904                 return 1;
905 #endif
906         close(fd);
907         pid = 0;
908         fd = -1;
909
910         return 0;
911 }
912
913 static int cmd_restart(int argc, char *argv[]) {
914         cmd_stop(1, argv);
915         return cmd_start(argc, argv);
916 }
917
918 static int cmd_reload(int argc, char *argv[]) {
919         if(argc > 1) {
920                 fprintf(stderr, "Too many arguments!\n");
921                 return 1;
922         }
923
924         if(!connect_tincd(true))
925                 return 1;
926
927         sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
928         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RELOAD || result) {
929                 fprintf(stderr, "Could not reload configuration.\n");
930                 return 1;
931         }
932
933         return 0;
934
935 }
936
937 static int cmd_dump(int argc, char *argv[]) {
938         bool only_reachable = false;
939
940         if(argc > 2 && !strcasecmp(argv[1], "reachable")) {
941                 if(strcasecmp(argv[2], "nodes")) {
942                         fprintf(stderr, "`reachable' only supported for nodes.\n");
943                         usage(true);
944                         return 1;
945                 }
946                 only_reachable = true;
947                 argv++;
948                 argc--;
949         }
950
951         if(argc != 2) {
952                 fprintf(stderr, "Invalid number of arguments.\n");
953                 usage(true);
954                 return 1;
955         }
956
957         if(!connect_tincd(true))
958                 return 1;
959
960         int do_graph = 0;
961
962         if(!strcasecmp(argv[1], "nodes"))
963                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
964         else if(!strcasecmp(argv[1], "edges"))
965                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
966         else if(!strcasecmp(argv[1], "subnets"))
967                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
968         else if(!strcasecmp(argv[1], "connections"))
969                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_CONNECTIONS);
970         else if(!strcasecmp(argv[1], "graph")) {
971                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
972                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
973                 do_graph = 1;
974         } else if(!strcasecmp(argv[1], "digraph")) {
975                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
976                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_EDGES);
977                 do_graph = 2;
978         } else {
979                 fprintf(stderr, "Unknown dump type '%s'.\n", argv[1]);
980                 usage(true);
981                 return 1;
982         }
983
984         if(do_graph == 1)
985                 printf("graph {\n");
986         else if(do_graph == 2)
987                 printf("digraph {\n");
988
989         while(recvline(fd, line, sizeof line)) {
990                 char node1[4096], node2[4096];
991                 int n = sscanf(line, "%d %d %s %s", &code, &req, node1, node2);
992                 if(n == 2) {
993                         if(do_graph && req == REQ_DUMP_NODES)
994                                 continue;
995                         else {
996                                 if(do_graph)
997                                         printf("}\n");
998                                 return 0;
999                         }
1000                 }
1001                 if(n < 2)
1002                         break;
1003
1004                 char node[4096];
1005                 char id[4096];
1006                 char from[4096];
1007                 char to[4096];
1008                 char subnet[4096];
1009                 char host[4096];
1010                 char port[4096];
1011                 char local_host[4096];
1012                 char local_port[4096];
1013                 char via[4096];
1014                 char nexthop[4096];
1015                 int cipher, digest, maclength, compression, distance, socket, weight;
1016                 short int pmtu, minmtu, maxmtu;
1017                 unsigned int options, status_int;
1018                 node_status_t status;
1019                 long int last_state_change;
1020
1021                 switch(req) {
1022                         case REQ_DUMP_NODES: {
1023                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %d %d %d %d %x %x %s %s %d %hd %hd %hd %ld", node, id, host, port, &cipher, &digest, &maclength, &compression, &options, &status_int, nexthop, via, &distance, &pmtu, &minmtu, &maxmtu, &last_state_change);
1024                                 if(n != 17) {
1025                                         fprintf(stderr, "Unable to parse node dump from tincd: %s\n", line);
1026                                         return 1;
1027                                 }
1028
1029                                 memcpy(&status, &status_int, sizeof status);
1030
1031                                 if(do_graph) {
1032                                         const char *color = "black";
1033                                         if(!strcmp(host, "MYSELF"))
1034                                                 color = "green";
1035                                         else if(!status.reachable)
1036                                                 color = "red";
1037                                         else if(strcmp(via, node))
1038                                                 color = "orange";
1039                                         else if(!status.validkey)
1040                                                 color = "black";
1041                                         else if(minmtu > 0)
1042                                                 color = "green";
1043                                         printf(" %s [label = \"%s\", color = \"%s\"%s];\n", node, node, color, strcmp(host, "MYSELF") ? "" : ", style = \"filled\"");
1044                                 } else {
1045                                         if(only_reachable && !status.reachable)
1046                                                 continue;
1047                                         printf("%s id %s at %s port %s cipher %d digest %d maclength %d compression %d options %x status %04x nexthop %s via %s distance %d pmtu %hd (min %hd max %hd)\n",
1048                                                         node, id, host, port, cipher, digest, maclength, compression, options, status_int, nexthop, via, distance, pmtu, minmtu, maxmtu);
1049                                 }
1050                         } break;
1051
1052                         case REQ_DUMP_EDGES: {
1053                                 int n = sscanf(line, "%*d %*d %s %s %s port %s %s port %s %x %d", from, to, host, port, local_host, local_port, &options, &weight);
1054                                 if(n != 8) {
1055                                         fprintf(stderr, "Unable to parse edge dump from tincd.\n");
1056                                         return 1;
1057                                 }
1058
1059                                 if(do_graph) {
1060                                         float w = 1 + 65536.0 / weight;
1061                                         if(do_graph == 1 && strcmp(node1, node2) > 0)
1062                                                 printf(" %s -- %s [w = %f, weight = %f];\n", node1, node2, w, w);
1063                                         else if(do_graph == 2)
1064                                                 printf(" %s -> %s [w = %f, weight = %f];\n", node1, node2, w, w);
1065                                 } else {
1066                                         printf("%s to %s at %s port %s local %s port %s options %x weight %d\n", from, to, host, port, local_host, local_port, options, weight);
1067                                 }
1068                         } break;
1069
1070                         case REQ_DUMP_SUBNETS: {
1071                                 int n = sscanf(line, "%*d %*d %s %s", subnet, node);
1072                                 if(n != 2) {
1073                                         fprintf(stderr, "Unable to parse subnet dump from tincd.\n");
1074                                         return 1;
1075                                 }
1076                                 printf("%s owner %s\n", strip_weight(subnet), node);
1077                         } break;
1078
1079                         case REQ_DUMP_CONNECTIONS: {
1080                                 int n = sscanf(line, "%*d %*d %s %s port %s %x %d %x", node, host, port, &options, &socket, &status_int);
1081                                 if(n != 6) {
1082                                         fprintf(stderr, "Unable to parse connection dump from tincd.\n");
1083                                         return 1;
1084                                 }
1085                                 printf("%s at %s port %s options %x socket %d status %x\n", node, host, port, options, socket, status_int);
1086                         } break;
1087
1088                         default:
1089                                 fprintf(stderr, "Unable to parse dump from tincd.\n");
1090                                 return 1;
1091                 }
1092         }
1093
1094         fprintf(stderr, "Error receiving dump.\n");
1095         return 1;
1096 }
1097
1098 static int cmd_purge(int argc, char *argv[]) {
1099         if(argc > 1) {
1100                 fprintf(stderr, "Too many arguments!\n");
1101                 return 1;
1102         }
1103
1104         if(!connect_tincd(true))
1105                 return 1;
1106
1107         sendline(fd, "%d %d", CONTROL, REQ_PURGE);
1108         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_PURGE || result) {
1109                 fprintf(stderr, "Could not purge old information.\n");
1110                 return 1;
1111         }
1112
1113         return 0;
1114 }
1115
1116 static int cmd_debug(int argc, char *argv[]) {
1117         if(argc != 2) {
1118                 fprintf(stderr, "Invalid number of arguments.\n");
1119                 return 1;
1120         }
1121
1122         if(!connect_tincd(true))
1123                 return 1;
1124
1125         int debuglevel = atoi(argv[1]);
1126         int origlevel;
1127
1128         sendline(fd, "%d %d %d", CONTROL, REQ_SET_DEBUG, debuglevel);
1129         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &origlevel) != 3 || code != CONTROL || req != REQ_SET_DEBUG) {
1130                 fprintf(stderr, "Could not set debug level.\n");
1131                 return 1;
1132         }
1133
1134         fprintf(stderr, "Old level %d, new level %d.\n", origlevel, debuglevel);
1135         return 0;
1136 }
1137
1138 static int cmd_retry(int argc, char *argv[]) {
1139         if(argc > 1) {
1140                 fprintf(stderr, "Too many arguments!\n");
1141                 return 1;
1142         }
1143
1144         if(!connect_tincd(true))
1145                 return 1;
1146
1147         sendline(fd, "%d %d", CONTROL, REQ_RETRY);
1148         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_RETRY || result) {
1149                 fprintf(stderr, "Could not retry outgoing connections.\n");
1150                 return 1;
1151         }
1152
1153         return 0;
1154 }
1155
1156 static int cmd_connect(int argc, char *argv[]) {
1157         if(argc != 2) {
1158                 fprintf(stderr, "Invalid number of arguments.\n");
1159                 return 1;
1160         }
1161
1162         if(!check_id(argv[1])) {
1163                 fprintf(stderr, "Invalid name for node.\n");
1164                 return 1;
1165         }
1166
1167         if(!connect_tincd(true))
1168                 return 1;
1169
1170         sendline(fd, "%d %d %s", CONTROL, REQ_CONNECT, argv[1]);
1171         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_CONNECT || result) {
1172                 fprintf(stderr, "Could not connect to %s.\n", argv[1]);
1173                 return 1;
1174         }
1175
1176         return 0;
1177 }
1178
1179 static int cmd_disconnect(int argc, char *argv[]) {
1180         if(argc != 2) {
1181                 fprintf(stderr, "Invalid number of arguments.\n");
1182                 return 1;
1183         }
1184
1185         if(!check_id(argv[1])) {
1186                 fprintf(stderr, "Invalid name for node.\n");
1187                 return 1;
1188         }
1189
1190         if(!connect_tincd(true))
1191                 return 1;
1192
1193         sendline(fd, "%d %d %s", CONTROL, REQ_DISCONNECT, argv[1]);
1194         if(!recvline(fd, line, sizeof line) || sscanf(line, "%d %d %d", &code, &req, &result) != 3 || code != CONTROL || req != REQ_DISCONNECT || result) {
1195                 fprintf(stderr, "Could not disconnect %s.\n", argv[1]);
1196                 return 1;
1197         }
1198
1199         return 0;
1200 }
1201
1202 static int cmd_top(int argc, char *argv[]) {
1203         if(argc > 1) {
1204                 fprintf(stderr, "Too many arguments!\n");
1205                 return 1;
1206         }
1207
1208 #ifdef HAVE_CURSES
1209         if(!connect_tincd(true))
1210                 return 1;
1211
1212         top(fd);
1213         return 0;
1214 #else
1215         fprintf(stderr, "This version of tinc was compiled without support for the curses library.\n");
1216         return 1;
1217 #endif
1218 }
1219
1220 static int cmd_pcap(int argc, char *argv[]) {
1221         if(argc > 2) {
1222                 fprintf(stderr, "Too many arguments!\n");
1223                 return 1;
1224         }
1225
1226         if(!connect_tincd(true))
1227                 return 1;
1228
1229         pcap(fd, stdout, argc > 1 ? atoi(argv[1]) : 0);
1230         return 0;
1231 }
1232
1233 #ifdef SIGINT
1234 static void sigint_handler(int sig) {
1235         fprintf(stderr, "\n");
1236         shutdown(fd, SHUT_RDWR);
1237 }
1238 #endif
1239
1240 static int cmd_log(int argc, char *argv[]) {
1241         if(argc > 2) {
1242                 fprintf(stderr, "Too many arguments!\n");
1243                 return 1;
1244         }
1245
1246         if(!connect_tincd(true))
1247                 return 1;
1248
1249 #ifdef SIGINT
1250         signal(SIGINT, sigint_handler);
1251 #endif
1252
1253         logcontrol(fd, stdout, argc > 1 ? atoi(argv[1]) : -1);
1254
1255 #ifdef SIGINT
1256         signal(SIGINT, SIG_DFL);
1257 #endif
1258
1259         close(fd);
1260         fd = -1;
1261         return 0;
1262 }
1263
1264 static int cmd_pid(int argc, char *argv[]) {
1265         if(argc > 1) {
1266                 fprintf(stderr, "Too many arguments!\n");
1267                 return 1;
1268         }
1269
1270         if(!connect_tincd(true) && !pid)
1271                 return 1;
1272
1273         printf("%d\n", pid);
1274         return 0;
1275 }
1276
1277 int rstrip(char *value) {
1278         int len = strlen(value);
1279         while(len && strchr("\t\r\n ", value[len - 1]))
1280                 value[--len] = 0;
1281         return len;
1282 }
1283
1284 char *get_my_name(bool verbose) {
1285         FILE *f = fopen(tinc_conf, "r");
1286         if(!f) {
1287                 if(verbose)
1288                         fprintf(stderr, "Could not open %s: %s\n", tinc_conf, strerror(errno));
1289                 return NULL;
1290         }
1291
1292         char buf[4096];
1293         char *value;
1294         while(fgets(buf, sizeof buf, f)) {
1295                 int len = strcspn(buf, "\t =");
1296                 value = buf + len;
1297                 value += strspn(value, "\t ");
1298                 if(*value == '=') {
1299                         value++;
1300                         value += strspn(value, "\t ");
1301                 }
1302                 if(!rstrip(value))
1303                         continue;
1304                 buf[len] = 0;
1305                 if(strcasecmp(buf, "Name"))
1306                         continue;
1307                 if(*value) {
1308                         fclose(f);
1309                         return replace_name(value);
1310                 }
1311         }
1312
1313         fclose(f);
1314         if(verbose)
1315                 fprintf(stderr, "Could not find Name in %s.\n", tinc_conf);
1316         return NULL;
1317 }
1318
1319 const var_t variables[] = {
1320         /* Server configuration */
1321         {"AddressFamily", VAR_SERVER},
1322         {"AutoConnect", VAR_SERVER | VAR_SAFE},
1323         {"BindToAddress", VAR_SERVER | VAR_MULTIPLE},
1324         {"BindToInterface", VAR_SERVER},
1325         {"Broadcast", VAR_SERVER | VAR_SAFE},
1326         {"ConnectTo", VAR_SERVER | VAR_MULTIPLE | VAR_SAFE},
1327         {"DecrementTTL", VAR_SERVER},
1328         {"Device", VAR_SERVER},
1329         {"DeviceType", VAR_SERVER},
1330         {"DirectOnly", VAR_SERVER},
1331         {"Ed25519PrivateKeyFile", VAR_SERVER},
1332         {"ExperimentalProtocol", VAR_SERVER},
1333         {"Forwarding", VAR_SERVER},
1334         {"GraphDumpFile", VAR_SERVER | VAR_OBSOLETE},
1335         {"Hostnames", VAR_SERVER},
1336         {"IffOneQueue", VAR_SERVER},
1337         {"Interface", VAR_SERVER},
1338         {"KeyExpire", VAR_SERVER},
1339         {"ListenAddress", VAR_SERVER | VAR_MULTIPLE},
1340         {"LocalDiscovery", VAR_SERVER},
1341         {"MACExpire", VAR_SERVER},
1342         {"MaxConnectionBurst", VAR_SERVER},
1343         {"MaxOutputBufferSize", VAR_SERVER},
1344         {"MaxTimeout", VAR_SERVER},
1345         {"Mode", VAR_SERVER | VAR_SAFE},
1346         {"Name", VAR_SERVER},
1347         {"PingInterval", VAR_SERVER},
1348         {"PingTimeout", VAR_SERVER},
1349         {"PriorityInheritance", VAR_SERVER},
1350         {"PrivateKey", VAR_SERVER | VAR_OBSOLETE},
1351         {"PrivateKeyFile", VAR_SERVER},
1352         {"ProcessPriority", VAR_SERVER},
1353         {"Proxy", VAR_SERVER},
1354         {"ReplayWindow", VAR_SERVER},
1355         {"ScriptsExtension", VAR_SERVER},
1356         {"ScriptsInterpreter", VAR_SERVER},
1357         {"StrictSubnets", VAR_SERVER},
1358         {"TunnelServer", VAR_SERVER},
1359         {"UDPRcvBuf", VAR_SERVER},
1360         {"UDPSndBuf", VAR_SERVER},
1361         {"VDEGroup", VAR_SERVER},
1362         {"VDEPort", VAR_SERVER},
1363         /* Host configuration */
1364         {"Address", VAR_HOST | VAR_MULTIPLE},
1365         {"Cipher", VAR_SERVER | VAR_HOST},
1366         {"ClampMSS", VAR_SERVER | VAR_HOST},
1367         {"Compression", VAR_SERVER | VAR_HOST},
1368         {"Digest", VAR_SERVER | VAR_HOST},
1369         {"Ed25519PublicKey", VAR_HOST},
1370         {"Ed25519PublicKeyFile", VAR_SERVER | VAR_HOST},
1371         {"IndirectData", VAR_SERVER | VAR_HOST},
1372         {"MACLength", VAR_SERVER | VAR_HOST},
1373         {"PMTU", VAR_SERVER | VAR_HOST},
1374         {"PMTUDiscovery", VAR_SERVER | VAR_HOST},
1375         {"Port", VAR_HOST},
1376         {"PublicKey", VAR_HOST | VAR_OBSOLETE},
1377         {"PublicKeyFile", VAR_SERVER | VAR_HOST | VAR_OBSOLETE},
1378         {"Subnet", VAR_HOST | VAR_MULTIPLE | VAR_SAFE},
1379         {"TCPOnly", VAR_SERVER | VAR_HOST},
1380         {"Weight", VAR_HOST | VAR_SAFE},
1381         {NULL, 0}
1382 };
1383
1384 static int cmd_config(int argc, char *argv[]) {
1385         if(argc < 2) {
1386                 fprintf(stderr, "Invalid number of arguments.\n");
1387                 return 1;
1388         }
1389
1390         if(strcasecmp(argv[0], "config"))
1391                 argv--, argc++;
1392
1393         int action = -2;
1394         if(!strcasecmp(argv[1], "get")) {
1395                 argv++, argc--;
1396         } else if(!strcasecmp(argv[1], "add")) {
1397                 argv++, argc--, action = 1;
1398         } else if(!strcasecmp(argv[1], "del")) {
1399                 argv++, argc--, action = -1;
1400         } else if(!strcasecmp(argv[1], "replace") || !strcasecmp(argv[1], "set") || !strcasecmp(argv[1], "change")) {
1401                 argv++, argc--, action = 0;
1402         }
1403
1404         if(argc < 2) {
1405                 fprintf(stderr, "Invalid number of arguments.\n");
1406                 return 1;
1407         }
1408
1409         // Concatenate the rest of the command line
1410         strncpy(line, argv[1], sizeof line - 1);
1411         for(int i = 2; i < argc; i++) {
1412                 strncat(line, " ", sizeof line - 1 - strlen(line));
1413                 strncat(line, argv[i], sizeof line - 1 - strlen(line));
1414         }
1415
1416         // Liberal parsing into node name, variable name and value.
1417         char *node = NULL;
1418         char *variable;
1419         char *value;
1420         int len;
1421
1422         len = strcspn(line, "\t =");
1423         value = line + len;
1424         value += strspn(value, "\t ");
1425         if(*value == '=') {
1426                 value++;
1427                 value += strspn(value, "\t ");
1428         }
1429         line[len] = '\0';
1430         variable = strchr(line, '.');
1431         if(variable) {
1432                 node = line;
1433                 *variable++ = 0;
1434         } else {
1435                 variable = line;
1436         }
1437
1438         if(!*variable) {
1439                 fprintf(stderr, "No variable given.\n");
1440                 return 1;
1441         }
1442
1443         if(action >= 0 && !*value) {
1444                 fprintf(stderr, "No value for variable given.\n");
1445                 return 1;
1446         }
1447
1448         if(action < -1 && *value)
1449                 action = 0;
1450
1451         /* Some simple checks. */
1452         bool found = false;
1453         bool warnonremove = false;
1454
1455         for(int i = 0; variables[i].name; i++) {
1456                 if(strcasecmp(variables[i].name, variable))
1457                         continue;
1458
1459                 found = true;
1460                 variable = (char *)variables[i].name;
1461
1462                 /* Discourage use of obsolete variables. */
1463
1464                 if(variables[i].type & VAR_OBSOLETE && action >= 0) {
1465                         if(force) {
1466                                 fprintf(stderr, "Warning: %s is an obsolete variable!\n", variable);
1467                         } else {
1468                                 fprintf(stderr, "%s is an obsolete variable! Use --force to use it anyway.\n", variable);
1469                                 return 1;
1470                         }
1471                 }
1472
1473                 /* Don't put server variables in host config files */
1474
1475                 if(node && !(variables[i].type & VAR_HOST) && action >= 0) {
1476                         if(force) {
1477                                 fprintf(stderr, "Warning: %s is not a host configuration variable!\n", variable);
1478                         } else {
1479                                 fprintf(stderr, "%s is not a host configuration variable! Use --force to use it anyway.\n", variable);
1480                                 return 1;
1481                         }
1482                 }
1483
1484                 /* Should this go into our own host config file? */
1485
1486                 if(!node && !(variables[i].type & VAR_SERVER)) {
1487                         node = get_my_name(true);
1488                         if(!node)
1489                                 return 1;
1490                 }
1491
1492                 /* Change "add" into "set" for variables that do not allow multiple occurences.
1493                    Turn on warnings when it seems variables might be removed unintentionally. */
1494
1495                 if(action == 1 && !(variables[i].type & VAR_MULTIPLE)) {
1496                         warnonremove = true;
1497                         action = 0;
1498                 } else if(action == 0 && (variables[i].type & VAR_MULTIPLE)) {
1499                         warnonremove = true;
1500                 }
1501
1502                 break;
1503         }
1504
1505         if(node && !check_id(node)) {
1506                 fprintf(stderr, "Invalid name for node.\n");
1507                 return 1;
1508         }
1509
1510         if(!found) {
1511                 if(force || action < 0) {
1512                         fprintf(stderr, "Warning: %s is not a known configuration variable!\n", variable);
1513                 } else {
1514                         fprintf(stderr, "%s: is not a known configuration variable! Use --force to use it anyway.\n", variable);
1515                         return 1;
1516                 }
1517         }
1518
1519         // Open the right configuration file.
1520         char *filename;
1521         if(node)
1522                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, node);
1523         else
1524                 filename = tinc_conf;
1525
1526         FILE *f = fopen(filename, "r");
1527         if(!f) {
1528                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1529                 return 1;
1530         }
1531
1532         char *tmpfile = NULL;
1533         FILE *tf = NULL;
1534
1535         if(action >= -1) {
1536                 xasprintf(&tmpfile, "%s.config.tmp", filename);
1537                 tf = fopen(tmpfile, "w");
1538                 if(!tf) {
1539                         fprintf(stderr, "Could not open temporary file %s: %s\n", tmpfile, strerror(errno));
1540                         fclose(f);
1541                         return 1;
1542                 }
1543         }
1544
1545         // Copy the file, making modifications on the fly, unless we are just getting a value.
1546         char buf1[4096];
1547         char buf2[4096];
1548         bool set = false;
1549         bool removed = false;
1550         found = false;
1551
1552         while(fgets(buf1, sizeof buf1, f)) {
1553                 buf1[sizeof buf1 - 1] = 0;
1554                 strncpy(buf2, buf1, sizeof buf2);
1555
1556                 // Parse line in a simple way
1557                 char *bvalue;
1558                 int len;
1559
1560                 len = strcspn(buf2, "\t =");
1561                 bvalue = buf2 + len;
1562                 bvalue += strspn(bvalue, "\t ");
1563                 if(*bvalue == '=') {
1564                         bvalue++;
1565                         bvalue += strspn(bvalue, "\t ");
1566                 }
1567                 rstrip(bvalue);
1568                 buf2[len] = '\0';
1569
1570                 // Did it match?
1571                 if(!strcasecmp(buf2, variable)) {
1572                         // Get
1573                         if(action < -1) {
1574                                 found = true;
1575                                 printf("%s\n", bvalue);
1576                         // Del
1577                         } else if(action == -1) {
1578                                 if(!*value || !strcasecmp(bvalue, value)) {
1579                                         removed = true;
1580                                         continue;
1581                                 }
1582                         // Set
1583                         } else if(action == 0) {
1584                                 // Warn if "set" was used for variables that can occur multiple times
1585                                 if(warnonremove && strcasecmp(bvalue, value))
1586                                         fprintf(stderr, "Warning: removing %s = %s\n", variable, bvalue);
1587
1588                                 // Already set? Delete the rest...
1589                                 if(set)
1590                                         continue;
1591
1592                                 // Otherwise, replace.
1593                                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1594                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1595                                         return 1;
1596                                 }
1597                                 set = true;
1598                                 continue;
1599                         }
1600                 }
1601
1602                 if(action >= -1) {
1603                         // Copy original line...
1604                         if(fputs(buf1, tf) < 0) {
1605                                 fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1606                                 return 1;
1607                         }
1608
1609                         // Add newline if it is missing...
1610                         if(*buf1 && buf1[strlen(buf1) - 1] != '\n') {
1611                                 if(fputc('\n', tf) < 0) {
1612                                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1613                                         return 1;
1614                                 }
1615                         }
1616                 }
1617         }
1618
1619         // Make sure we read everything...
1620         if(ferror(f) || !feof(f)) {
1621                 fprintf(stderr, "Error while reading from configuration file %s: %s\n", filename, strerror(errno));
1622                 return 1;
1623         }
1624
1625         if(fclose(f)) {
1626                 fprintf(stderr, "Error closing configuration file %s: %s\n", filename, strerror(errno));
1627                 return 1;
1628         }
1629
1630         // Add new variable if necessary.
1631         if(action > 0 || (action == 0 && !set)) {
1632                 if(fprintf(tf, "%s = %s\n", variable, value) < 0) {
1633                         fprintf(stderr, "Error writing to temporary file %s: %s\n", tmpfile, strerror(errno));
1634                         return 1;
1635                 }
1636         }
1637
1638         if(action < -1) {
1639                 if(found) {
1640                         return 0;
1641                 } else {
1642                         fprintf(stderr, "No matching configuration variables found.\n");
1643                         return 1;
1644                 }
1645         }
1646
1647         // Make sure we wrote everything...
1648         if(fclose(tf)) {
1649                 fprintf(stderr, "Error closing temporary file %s: %s\n", tmpfile, strerror(errno));
1650                 return 1;
1651         }
1652
1653         // Could we find what we had to remove?
1654         if(action < 0 && !removed) {
1655                 remove(tmpfile);
1656                 fprintf(stderr, "No configuration variables deleted.\n");
1657                 return 1;
1658         }
1659
1660         // Replace the configuration file with the new one
1661 #ifdef HAVE_MINGW
1662         if(remove(filename)) {
1663                 fprintf(stderr, "Error replacing file %s: %s\n", filename, strerror(errno));
1664                 return 1;
1665         }
1666 #endif
1667         if(rename(tmpfile, filename)) {
1668                 fprintf(stderr, "Error renaming temporary file %s to configuration file %s: %s\n", tmpfile, filename, strerror(errno));
1669                 return 1;
1670         }
1671
1672         // Silently try notifying a running tincd of changes.
1673         if(connect_tincd(false))
1674                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1675
1676         return 0;
1677 }
1678
1679 static bool try_bind(int port) {
1680         struct addrinfo *ai = NULL;
1681         struct addrinfo hint = {
1682                 .ai_flags = AI_PASSIVE,
1683                 .ai_family = AF_UNSPEC,
1684                 .ai_socktype = SOCK_STREAM,
1685                 .ai_protocol = IPPROTO_TCP,
1686         };
1687
1688         char portstr[16];
1689         snprintf(portstr, sizeof portstr, "%d", port);
1690
1691         if(getaddrinfo(NULL, portstr, &hint, &ai) || !ai)
1692                 return false;
1693
1694         while(ai) {
1695                 int fd = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
1696                 if(!fd)
1697                         return false;
1698                 int result = bind(fd, ai->ai_addr, ai->ai_addrlen);
1699                 closesocket(fd);
1700                 if(result)
1701                         return false;
1702                 ai = ai->ai_next;
1703         }
1704
1705         return true;
1706 }
1707
1708 int check_port(char *name) {
1709         if(try_bind(655))
1710                 return 655;
1711
1712         fprintf(stderr, "Warning: could not bind to port 655. ");
1713
1714         for(int i = 0; i < 100; i++) {
1715                 int port = 0x1000 + (rand() & 0x7fff);
1716                 if(try_bind(port)) {
1717                         char *filename;
1718                         xasprintf(&filename, "%s" SLASH "hosts" SLASH "%s", confbase, name);
1719                         FILE *f = fopen(filename, "a");
1720                         free(filename);
1721                         if(!f) {
1722                                 fprintf(stderr, "Please change tinc's Port manually.\n");
1723                                 return 0;
1724                         }
1725
1726                         fprintf(f, "Port = %d\n", port);
1727                         fclose(f);
1728                         fprintf(stderr, "Tinc will instead listen on port %d.\n", port);
1729                         return port;
1730                 }
1731         }
1732
1733         fprintf(stderr, "Please change tinc's Port manually.\n");
1734         return 0;
1735 }
1736
1737 static int cmd_init(int argc, char *argv[]) {
1738         if(!access(tinc_conf, F_OK)) {
1739                 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1740                 return 1;
1741         }
1742
1743         if(argc > 2) {
1744                 fprintf(stderr, "Too many arguments!\n");
1745                 return 1;
1746         } else if(argc < 2) {
1747                 if(tty) {
1748                         char buf[1024];
1749                         fprintf(stderr, "Enter the Name you want your tinc node to have: ");
1750                         if(!fgets(buf, sizeof buf, stdin)) {
1751                                 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1752                                 return 1;
1753                         }
1754                         int len = rstrip(buf);
1755                         if(!len) {
1756                                 fprintf(stderr, "No name given!\n");
1757                                 return 1;
1758                         }
1759                         name = strdup(buf);
1760                 } else {
1761                         fprintf(stderr, "No Name given!\n");
1762                         return 1;
1763                 }
1764         } else {
1765                 name = strdup(argv[1]);
1766                 if(!*name) {
1767                         fprintf(stderr, "No Name given!\n");
1768                         return 1;
1769                 }
1770         }
1771
1772         if(!check_id(name)) {
1773                 fprintf(stderr, "Invalid Name! Only a-z, A-Z, 0-9 and _ are allowed characters.\n");
1774                 return 1;
1775         }
1776
1777         if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1778                 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1779                 return 1;
1780         }
1781
1782         if(mkdir(confbase, 0777) && errno != EEXIST) {
1783                 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1784                 return 1;
1785         }
1786
1787         if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
1788                 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
1789                 return 1;
1790         }
1791
1792         FILE *f = fopen(tinc_conf, "w");
1793         if(!f) {
1794                 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
1795                 return 1;
1796         }
1797
1798         fprintf(f, "Name = %s\n", name);
1799         fclose(f);
1800
1801         if(!rsa_keygen(2048, false) || !ed25519_keygen(false))
1802                 return 1;
1803
1804         check_port(name);
1805
1806 #ifndef HAVE_MINGW
1807         char *filename;
1808         xasprintf(&filename, "%s" SLASH "tinc-up", confbase);
1809         if(access(filename, F_OK)) {
1810                 FILE *f = fopenmask(filename, "w", 0777);
1811                 if(!f) {
1812                         fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
1813                         return 1;
1814                 }
1815                 fprintf(f, "#!/bin/sh\n\necho 'Unconfigured tinc-up script, please edit '$0'!'\n\n#ifconfig $INTERFACE <your vpn IP address> netmask <netmask of whole VPN>\n");
1816                 fclose(f);
1817         }
1818 #endif
1819
1820         return 0;
1821
1822 }
1823
1824 static int cmd_generate_keys(int argc, char *argv[]) {
1825         if(argc > 2) {
1826                 fprintf(stderr, "Too many arguments!\n");
1827                 return 1;
1828         }
1829
1830         if(!name)
1831                 name = get_my_name(false);
1832
1833         return !(rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true) && ed25519_keygen(true));
1834 }
1835
1836 static int cmd_generate_rsa_keys(int argc, char *argv[]) {
1837         if(argc > 2) {
1838                 fprintf(stderr, "Too many arguments!\n");
1839                 return 1;
1840         }
1841
1842         if(!name)
1843                 name = get_my_name(false);
1844
1845         return !rsa_keygen(argc > 1 ? atoi(argv[1]) : 2048, true);
1846 }
1847
1848 static int cmd_generate_ed25519_keys(int argc, char *argv[]) {
1849         if(argc > 1) {
1850                 fprintf(stderr, "Too many arguments!\n");
1851                 return 1;
1852         }
1853
1854         if(!name)
1855                 name = get_my_name(false);
1856
1857         return !ed25519_keygen(true);
1858 }
1859
1860 static int cmd_help(int argc, char *argv[]) {
1861         usage(false);
1862         return 0;
1863 }
1864
1865 static int cmd_version(int argc, char *argv[]) {
1866         if(argc > 1) {
1867                 fprintf(stderr, "Too many arguments!\n");
1868                 return 1;
1869         }
1870
1871         version();
1872         return 0;
1873 }
1874
1875 static int cmd_info(int argc, char *argv[]) {
1876         if(argc != 2) {
1877                 fprintf(stderr, "Invalid number of arguments.\n");
1878                 return 1;
1879         }
1880
1881         if(!connect_tincd(true))
1882                 return 1;
1883
1884         return info(fd, argv[1]);
1885 }
1886
1887 static const char *conffiles[] = {
1888         "tinc.conf",
1889         "tinc-up",
1890         "tinc-down",
1891         "subnet-up",
1892         "subnet-down",
1893         "host-up",
1894         "host-down",
1895         NULL,
1896 };
1897
1898 static int cmd_edit(int argc, char *argv[]) {
1899         if(argc != 2) {
1900                 fprintf(stderr, "Invalid number of arguments.\n");
1901                 return 1;
1902         }
1903
1904         char *filename = NULL;
1905
1906         if(strncmp(argv[1], "hosts" SLASH, 6)) {
1907                 for(int i = 0; conffiles[i]; i++) {
1908                         if(!strcmp(argv[1], conffiles[i])) {
1909                                 xasprintf(&filename, "%s" SLASH "%s", confbase, argv[1]);
1910                                 break;
1911                         }
1912                 }
1913         } else {
1914                 argv[1] += 6;
1915         }
1916
1917         if(!filename) {
1918                 xasprintf(&filename, "%s" SLASH "%s", hosts_dir, argv[1]);
1919                 char *dash = strchr(argv[1], '-');
1920                 if(dash) {
1921                         *dash++ = 0;
1922                         if((strcmp(dash, "up") && strcmp(dash, "down")) || !check_id(argv[1])) {
1923                                 fprintf(stderr, "Invalid configuration filename.\n");
1924                                 return 1;
1925                         }
1926                 }
1927         }
1928
1929         char *command;
1930 #ifndef HAVE_MINGW
1931         xasprintf(&command, "\"%s\" \"%s\"", getenv("VISUAL") ?: getenv("EDITOR") ?: "vi", filename);
1932 #else
1933         xasprintf(&command, "edit \"%s\"", filename);
1934 #endif
1935         int result = system(command);
1936         if(result)
1937                 return result;
1938
1939         // Silently try notifying a running tincd of changes.
1940         if(connect_tincd(false))
1941                 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
1942
1943         return 0;
1944 }
1945
1946 static int export(const char *name, FILE *out) {
1947         char *filename;
1948         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
1949         FILE *in = fopen(filename, "r");
1950         if(!in) {
1951                 fprintf(stderr, "Could not open configuration file %s: %s\n", filename, strerror(errno));
1952                 return 1;
1953         }
1954
1955         fprintf(out, "Name = %s\n", name);
1956         char buf[4096];
1957         while(fgets(buf, sizeof buf, in)) {
1958                 if(strcspn(buf, "\t =") != 4 || strncasecmp(buf, "Name", 4))
1959                         fputs(buf, out);
1960         }
1961
1962         if(ferror(in)) {
1963                 fprintf(stderr, "Error while reading configuration file %s: %s\n", filename, strerror(errno));
1964                 fclose(in);
1965                 return 1;
1966         }
1967
1968         fclose(in);
1969         return 0;
1970 }
1971
1972 static int cmd_export(int argc, char *argv[]) {
1973         if(argc > 1) {
1974                 fprintf(stderr, "Too many arguments!\n");
1975                 return 1;
1976         }
1977
1978         char *name = get_my_name(true);
1979         if(!name)
1980                 return 1;
1981
1982         int result = export(name, stdout);
1983         if(!tty)
1984                 fclose(stdout);
1985
1986         free(name);
1987         return result;
1988 }
1989
1990 static int cmd_export_all(int argc, char *argv[]) {
1991         if(argc > 1) {
1992                 fprintf(stderr, "Too many arguments!\n");
1993                 return 1;
1994         }
1995
1996         DIR *dir = opendir(hosts_dir);
1997         if(!dir) {
1998                 fprintf(stderr, "Could not open host configuration directory %s: %s\n", hosts_dir, strerror(errno));
1999                 return 1;
2000         }
2001
2002         bool first = true;
2003         int result = 0;
2004         struct dirent *ent;
2005
2006         while((ent = readdir(dir))) {
2007                 if(!check_id(ent->d_name))
2008                         continue;
2009
2010                 if(first)
2011                         first = false;
2012                 else
2013                         printf("#---------------------------------------------------------------#\n");
2014
2015                 result |= export(ent->d_name, stdout);
2016         }
2017
2018         closedir(dir);
2019         if(!tty)
2020                 fclose(stdout);
2021         return result;
2022 }
2023
2024 static int cmd_import(int argc, char *argv[]) {
2025         if(argc > 1) {
2026                 fprintf(stderr, "Too many arguments!\n");
2027                 return 1;
2028         }
2029
2030         FILE *in = stdin;
2031         FILE *out = NULL;
2032
2033         char buf[4096];
2034         char name[4096];
2035         char *filename = NULL;
2036         int count = 0;
2037         bool firstline = true;
2038
2039         while(fgets(buf, sizeof buf, in)) {
2040                 if(sscanf(buf, "Name = %s", name) == 1) {
2041                         firstline = false;
2042
2043                         if(!check_id(name)) {
2044                                 fprintf(stderr, "Invalid Name in input!\n");
2045                                 return 1;
2046                         }
2047
2048                         if(out)
2049                                 fclose(out);
2050
2051                         free(filename);
2052                         xasprintf(&filename, "%s" SLASH "%s", hosts_dir, name);
2053
2054                         if(!force && !access(filename, F_OK)) {
2055                                 fprintf(stderr, "Host configuration file %s already exists, skipping.\n", filename);
2056                                 out = NULL;
2057                                 continue;
2058                         }
2059
2060                         out = fopen(filename, "w");
2061                         if(!out) {
2062                                 fprintf(stderr, "Error creating configuration file %s: %s\n", filename, strerror(errno));
2063                                 return 1;
2064                         }
2065
2066                         count++;
2067                         continue;
2068                 } else if(firstline) {
2069                         fprintf(stderr, "Junk at the beginning of the input, ignoring.\n");
2070                         firstline = false;
2071                 }
2072
2073
2074                 if(!strcmp(buf, "#---------------------------------------------------------------#\n"))
2075                         continue;
2076
2077                 if(out) {
2078                         if(fputs(buf, out) < 0) {
2079                                 fprintf(stderr, "Error writing to host configuration file %s: %s\n", filename, strerror(errno));
2080                                 return 1;
2081                         }
2082                 }
2083         }
2084
2085         if(out)
2086                 fclose(out);
2087
2088         if(count) {
2089                 fprintf(stderr, "Imported %d host configuration files.\n", count);
2090                 return 0;
2091         } else {
2092                 fprintf(stderr, "No host configuration files imported.\n");
2093                 return 1;
2094         }
2095 }
2096
2097 static int cmd_exchange(int argc, char *argv[]) {
2098         return cmd_export(argc, argv) ?: cmd_import(argc, argv);
2099 }
2100
2101 static int cmd_exchange_all(int argc, char *argv[]) {
2102         return cmd_export_all(argc, argv) ?: cmd_import(argc, argv);
2103 }
2104
2105 static int switch_network(char *name) {
2106         if(fd >= 0) {
2107                 close(fd);
2108                 fd = -1;
2109         }
2110
2111         free(confbase);
2112         confbase = NULL;
2113         free(pidfilename);
2114         pidfilename = NULL;
2115         free(logfilename);
2116         logfilename = NULL;
2117         free(unixsocketname);
2118         unixsocketname = NULL;
2119         free(tinc_conf);
2120         free(hosts_dir);
2121         free(prompt);
2122
2123         free(netname);
2124         netname = strcmp(name, ".") ? xstrdup(name) : NULL;
2125
2126         make_names();
2127         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2128         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2129         xasprintf(&prompt, "%s> ", identname);
2130
2131         return 0;
2132 }
2133
2134 static int cmd_network(int argc, char *argv[]) {
2135         if(argc > 2) {
2136                 fprintf(stderr, "Too many arguments!\n");
2137                 return 1;
2138         }
2139
2140         if(argc == 2)
2141                 return switch_network(argv[1]);
2142
2143         DIR *dir = opendir(confdir);
2144         if(!dir) {
2145                 fprintf(stderr, "Could not read directory %s: %s\n", confdir, strerror(errno));
2146                 return 1;
2147         }
2148
2149         struct dirent *ent;
2150         while((ent = readdir(dir))) {
2151                 if(*ent->d_name == '.')
2152                         continue;
2153
2154                 if(!strcmp(ent->d_name, "tinc.conf")) {
2155                         printf(".\n");
2156                         continue;
2157                 }
2158
2159                 char *fname;
2160                 xasprintf(&fname, "%s/%s/tinc.conf", confdir, ent->d_name);
2161                 if(!access(fname, R_OK))
2162                         printf("%s\n", ent->d_name);
2163                 free(fname);
2164         }
2165
2166         closedir(dir);
2167
2168         return 0;
2169 }
2170
2171 static const struct {
2172         const char *command;
2173         int (*function)(int argc, char *argv[]);
2174         bool hidden;
2175 } commands[] = {
2176         {"start", cmd_start},
2177         {"stop", cmd_stop},
2178         {"restart", cmd_restart},
2179         {"reload", cmd_reload},
2180         {"dump", cmd_dump},
2181         {"purge", cmd_purge},
2182         {"debug", cmd_debug},
2183         {"retry", cmd_retry},
2184         {"connect", cmd_connect},
2185         {"disconnect", cmd_disconnect},
2186         {"top", cmd_top},
2187         {"pcap", cmd_pcap},
2188         {"log", cmd_log},
2189         {"pid", cmd_pid},
2190         {"config", cmd_config, true},
2191         {"add", cmd_config},
2192         {"del", cmd_config},
2193         {"get", cmd_config},
2194         {"set", cmd_config},
2195         {"init", cmd_init},
2196         {"generate-keys", cmd_generate_keys},
2197         {"generate-rsa-keys", cmd_generate_rsa_keys},
2198         {"generate-ed25519-keys", cmd_generate_ed25519_keys},
2199         {"help", cmd_help},
2200         {"version", cmd_version},
2201         {"info", cmd_info},
2202         {"edit", cmd_edit},
2203         {"export", cmd_export},
2204         {"export-all", cmd_export_all},
2205         {"import", cmd_import},
2206         {"exchange", cmd_exchange},
2207         {"exchange-all", cmd_exchange_all},
2208         {"invite", cmd_invite},
2209         {"join", cmd_join},
2210         {"network", cmd_network},
2211         {NULL, NULL},
2212 };
2213
2214 #ifdef HAVE_READLINE
2215 static char *complete_command(const char *text, int state) {
2216         static int i;
2217
2218         if(!state)
2219                 i = 0;
2220         else
2221                 i++;
2222
2223         while(commands[i].command) {
2224                 if(!commands[i].hidden && !strncasecmp(commands[i].command, text, strlen(text)))
2225                         return xstrdup(commands[i].command);
2226                 i++;
2227         }
2228
2229         return NULL;
2230 }
2231
2232 static char *complete_dump(const char *text, int state) {
2233         const char *matches[] = {"reachable", "nodes", "edges", "subnets", "connections", "graph", NULL};
2234         static int i;
2235
2236         if(!state)
2237                 i = 0;
2238         else
2239                 i++;
2240
2241         while(matches[i]) {
2242                 if(!strncasecmp(matches[i], text, strlen(text)))
2243                         return xstrdup(matches[i]);
2244                 i++;
2245         }
2246
2247         return NULL;
2248 }
2249
2250 static char *complete_config(const char *text, int state) {
2251         static int i;
2252
2253         if(!state)
2254                 i = 0;
2255         else
2256                 i++;
2257
2258         while(variables[i].name) {
2259                 char *dot = strchr(text, '.');
2260                 if(dot) {
2261                         if((variables[i].type & VAR_HOST) && !strncasecmp(variables[i].name, dot + 1, strlen(dot + 1))) {
2262                                 char *match;
2263                                 xasprintf(&match, "%.*s.%s", (int)(dot - text), text, variables[i].name);
2264                                 return match;
2265                         }
2266                 } else {
2267                         if(!strncasecmp(variables[i].name, text, strlen(text)))
2268                                 return xstrdup(variables[i].name);
2269                 }
2270                 i++;
2271         }
2272
2273         return NULL;
2274 }
2275
2276 static char *complete_info(const char *text, int state) {
2277         static int i;
2278         if(!state) {
2279                 i = 0;
2280                 if(!connect_tincd(false))
2281                         return NULL;
2282                 // Check the list of nodes
2283                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
2284                 sendline(fd, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
2285         }
2286
2287         while(recvline(fd, line, sizeof line)) {
2288                 char item[4096];
2289                 int n = sscanf(line, "%d %d %s", &code, &req, item);
2290                 if(n == 2) {
2291                         i++;
2292                         if(i >= 2)
2293                                 break;
2294                         else
2295                                 continue;
2296                 }
2297
2298                 if(n != 3) {
2299                         fprintf(stderr, "Unable to parse dump from tincd, n = %d, i = %d.\n", n, i);
2300                         break;
2301                 }
2302
2303                 if(!strncmp(item, text, strlen(text)))
2304                         return xstrdup(strip_weight(item));
2305         }
2306
2307         return NULL;
2308 }
2309
2310 static char *complete_nothing(const char *text, int state) {
2311         return NULL;
2312 }
2313
2314 static char **completion (const char *text, int start, int end) {
2315         char **matches = NULL;
2316
2317         if(!start)
2318                 matches = rl_completion_matches(text, complete_command);
2319         else if(!strncasecmp(rl_line_buffer, "dump ", 5))
2320                 matches = rl_completion_matches(text, complete_dump);
2321         else if(!strncasecmp(rl_line_buffer, "add ", 4))
2322                 matches = rl_completion_matches(text, complete_config);
2323         else if(!strncasecmp(rl_line_buffer, "del ", 4))
2324                 matches = rl_completion_matches(text, complete_config);
2325         else if(!strncasecmp(rl_line_buffer, "get ", 4))
2326                 matches = rl_completion_matches(text, complete_config);
2327         else if(!strncasecmp(rl_line_buffer, "set ", 4))
2328                 matches = rl_completion_matches(text, complete_config);
2329         else if(!strncasecmp(rl_line_buffer, "info ", 5))
2330                 matches = rl_completion_matches(text, complete_info);
2331
2332         return matches;
2333 }
2334 #endif
2335
2336 static int cmd_shell(int argc, char *argv[]) {
2337         xasprintf(&prompt, "%s> ", identname);
2338         int result = 0;
2339         char buf[4096];
2340         char *line = NULL;
2341         int maxargs = argc + 16;
2342         char **nargv = xmalloc(maxargs * sizeof *nargv);
2343
2344         for(int i = 0; i < argc; i++)
2345                 nargv[i] = argv[i];
2346
2347 #ifdef HAVE_READLINE
2348         rl_readline_name = "tinc";
2349         rl_completion_entry_function = complete_nothing;
2350         rl_attempted_completion_function = completion;
2351         rl_filename_completion_desired = 0;
2352         char *copy = NULL;
2353 #endif
2354
2355         while(true) {
2356 #ifdef HAVE_READLINE
2357                 if(tty) {
2358                         free(copy);
2359                         free(line);
2360                         rl_basic_word_break_characters = "\t\n ";
2361                         line = readline(prompt);
2362                         if(line)
2363                                 copy = xstrdup(line);
2364                 } else {
2365                         line = fgets(buf, sizeof buf, stdin);
2366                 }
2367 #else
2368                 if(tty)
2369                         fputs(prompt, stdout);
2370
2371                 line = fgets(buf, sizeof buf, stdin);
2372 #endif
2373
2374                 if(!line)
2375                         break;
2376
2377                 /* Ignore comments */
2378
2379                 if(*line == '#')
2380                         continue;
2381
2382                 /* Split */
2383
2384                 int nargc = argc;
2385                 char *p = line + strspn(line, " \t\n");
2386                 char *next = strtok(p, " \t\n");
2387
2388                 while(p && *p) {
2389                         if(nargc >= maxargs) {
2390                                 fprintf(stderr, "next %p '%s', p %p '%s'\n", next, next, p, p);
2391                                 abort();
2392                                 maxargs *= 2;
2393                                 nargv = xrealloc(nargv, maxargs * sizeof *nargv);
2394                         }
2395
2396                         nargv[nargc++] = p;
2397                         p = next;
2398                         next = strtok(NULL, " \t\n");
2399                 }
2400
2401                 if(nargc == argc)
2402                         continue;
2403
2404                 if(!strcasecmp(nargv[argc], "exit") || !strcasecmp(nargv[argc], "quit"))
2405                         return result;
2406
2407                 bool found = false;
2408
2409                 for(int i = 0; commands[i].command; i++) {
2410                         if(!strcasecmp(nargv[argc], commands[i].command)) {
2411                                 result |= commands[i].function(nargc - argc - 1, nargv + argc + 1);
2412                                 found = true;
2413                                 break;
2414                         }
2415                 }
2416
2417 #ifdef HAVE_READLINE
2418                 if(tty && found)
2419                         add_history(copy);
2420 #endif
2421
2422                 if(!found) {
2423                         fprintf(stderr, "Unknown command `%s'.\n", nargv[argc]);
2424                         result |= 1;
2425                 }
2426         }
2427
2428         free(nargv);
2429
2430         if(tty)
2431                 printf("\n");
2432         return result;
2433 }
2434
2435
2436 int main(int argc, char *argv[]) {
2437         program_name = argv[0];
2438         orig_argv = argv;
2439         orig_argc = argc;
2440         tty = isatty(0) && isatty(1);
2441
2442         if(!parse_options(argc, argv))
2443                 return 1;
2444
2445         make_names();
2446         xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
2447         xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
2448
2449         if(show_version) {
2450                 version();
2451                 return 0;
2452         }
2453
2454         if(show_help) {
2455                 usage(false);
2456                 return 0;
2457         }
2458
2459 #ifdef HAVE_MINGW
2460         static struct WSAData wsa_state;
2461
2462         if(WSAStartup(MAKEWORD(2, 2), &wsa_state)) {
2463                 fprintf(stderr, "System call `%s' failed: %s", "WSAStartup", winerror(GetLastError()));
2464                 return false;
2465         }
2466 #endif
2467
2468         srand(time(NULL));
2469         crypto_init();
2470
2471         if(optind >= argc)
2472                 return cmd_shell(argc, argv);
2473
2474         for(int i = 0; commands[i].command; i++) {
2475                 if(!strcasecmp(argv[optind], commands[i].command))
2476                         return commands[i].function(argc - optind, argv + optind);
2477         }
2478
2479         fprintf(stderr, "Unknown command `%s'.\n", argv[optind]);
2480         usage(true);
2481         return 1;
2482 }