| 1 | /* Client process that communicates with GNU Emacs acting as server. |
| 2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003, 2004 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | |
| 23 | #define NO_SHORTNAMES |
| 24 | |
| 25 | #ifdef HAVE_CONFIG_H |
| 26 | #include <config.h> |
| 27 | #endif |
| 28 | |
| 29 | #undef signal |
| 30 | |
| 31 | #include <ctype.h> |
| 32 | #include <stdio.h> |
| 33 | #include <getopt.h> |
| 34 | #ifdef HAVE_UNISTD_H |
| 35 | #include <unistd.h> |
| 36 | #endif |
| 37 | |
| 38 | #ifdef VMS |
| 39 | # include "vms-pwd.h" |
| 40 | #else |
| 41 | # include <pwd.h> |
| 42 | #endif /* not VMS */ |
| 43 | |
| 44 | char *getenv (), *getwd (); |
| 45 | char *(getcwd) (); |
| 46 | |
| 47 | #ifndef VERSION |
| 48 | #define VERSION "unspecified" |
| 49 | #endif |
| 50 | \f |
| 51 | /* Name used to invoke this program. */ |
| 52 | char *progname; |
| 53 | |
| 54 | /* Nonzero means don't wait for a response from Emacs. --no-wait. */ |
| 55 | int nowait = 0; |
| 56 | |
| 57 | /* Nonzero means args are expressions to be evaluated. --eval. */ |
| 58 | int eval = 0; |
| 59 | |
| 60 | /* The display on which Emacs should work. --display. */ |
| 61 | char *display = NULL; |
| 62 | |
| 63 | /* If non-NULL, the name of an editor to fallback to if the server |
| 64 | is not running. --alternate-editor. */ |
| 65 | const char * alternate_editor = NULL; |
| 66 | |
| 67 | /* If non-NULL, the filename of the UNIX socket. */ |
| 68 | char *socket_name = NULL; |
| 69 | |
| 70 | void print_help_and_exit (); |
| 71 | |
| 72 | struct option longopts[] = |
| 73 | { |
| 74 | { "no-wait", no_argument, NULL, 'n' }, |
| 75 | { "eval", no_argument, NULL, 'e' }, |
| 76 | { "help", no_argument, NULL, 'H' }, |
| 77 | { "version", no_argument, NULL, 'V' }, |
| 78 | { "alternate-editor", required_argument, NULL, 'a' }, |
| 79 | { "socket-name", required_argument, NULL, 's' }, |
| 80 | { "display", required_argument, NULL, 'd' }, |
| 81 | { 0, 0, 0, 0 } |
| 82 | }; |
| 83 | |
| 84 | /* Decode the options from argv and argc. |
| 85 | The global variable `optind' will say how many arguments we used up. */ |
| 86 | |
| 87 | void |
| 88 | decode_options (argc, argv) |
| 89 | int argc; |
| 90 | char **argv; |
| 91 | { |
| 92 | alternate_editor = getenv ("ALTERNATE_EDITOR"); |
| 93 | |
| 94 | while (1) |
| 95 | { |
| 96 | int opt = getopt_long (argc, argv, |
| 97 | "VHnea:s:d:", longopts, 0); |
| 98 | |
| 99 | if (opt == EOF) |
| 100 | break; |
| 101 | |
| 102 | switch (opt) |
| 103 | { |
| 104 | case 0: |
| 105 | /* If getopt returns 0, then it has already processed a |
| 106 | long-named option. We should do nothing. */ |
| 107 | break; |
| 108 | |
| 109 | case 'a': |
| 110 | alternate_editor = optarg; |
| 111 | break; |
| 112 | |
| 113 | case 's': |
| 114 | socket_name = optarg; |
| 115 | break; |
| 116 | |
| 117 | case 'd': |
| 118 | display = optarg; |
| 119 | break; |
| 120 | |
| 121 | case 'n': |
| 122 | nowait = 1; |
| 123 | break; |
| 124 | |
| 125 | case 'e': |
| 126 | eval = 1; |
| 127 | break; |
| 128 | |
| 129 | case 'V': |
| 130 | printf ("emacsclient %s\n", VERSION); |
| 131 | exit (EXIT_SUCCESS); |
| 132 | break; |
| 133 | |
| 134 | case 'H': |
| 135 | print_help_and_exit (); |
| 136 | break; |
| 137 | |
| 138 | default: |
| 139 | fprintf (stderr, "Try `%s --help' for more information\n", progname); |
| 140 | exit (EXIT_FAILURE); |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | print_help_and_exit () |
| 148 | { |
| 149 | printf ( |
| 150 | "Usage: %s [OPTIONS] FILE...\n\ |
| 151 | Tell the Emacs server to visit the specified files.\n\ |
| 152 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ |
| 153 | \n\ |
| 154 | The following OPTIONS are accepted:\n\ |
| 155 | -V, --version Just print a version info and return\n\ |
| 156 | -H, --help Print this usage information message\n\ |
| 157 | -n, --no-wait Don't wait for the server to return\n\ |
| 158 | -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ |
| 159 | -d, --display=DISPLAY Visit the file in the given display\n\ |
| 160 | -s, --socket-name=FILENAME\n\ |
| 161 | Set the filename of the UNIX socket for communication\n\ |
| 162 | -a, --alternate-editor=EDITOR\n\ |
| 163 | Editor to fallback to if the server is not running\n\ |
| 164 | \n\ |
| 165 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); |
| 166 | exit (EXIT_SUCCESS); |
| 167 | } |
| 168 | |
| 169 | /* In NAME, insert a & before each &, each space, each newline, and |
| 170 | any initial -. Change spaces to underscores, too, so that the |
| 171 | return value never contains a space. */ |
| 172 | |
| 173 | void |
| 174 | quote_file_name (name, stream) |
| 175 | char *name; |
| 176 | FILE *stream; |
| 177 | { |
| 178 | char *copy = (char *) malloc (strlen (name) * 2 + 1); |
| 179 | char *p, *q; |
| 180 | |
| 181 | p = name; |
| 182 | q = copy; |
| 183 | while (*p) |
| 184 | { |
| 185 | if (*p == ' ') |
| 186 | { |
| 187 | *q++ = '&'; |
| 188 | *q++ = '_'; |
| 189 | p++; |
| 190 | } |
| 191 | else if (*p == '\n') |
| 192 | { |
| 193 | *q++ = '&'; |
| 194 | *q++ = 'n'; |
| 195 | p++; |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | if (*p == '&' || (*p == '-' && p == name)) |
| 200 | *q++ = '&'; |
| 201 | *q++ = *p++; |
| 202 | } |
| 203 | } |
| 204 | *q++ = 0; |
| 205 | |
| 206 | fprintf (stream, "%s", copy); |
| 207 | |
| 208 | free (copy); |
| 209 | } |
| 210 | |
| 211 | /* Like malloc but get fatal error if memory is exhausted. */ |
| 212 | |
| 213 | long * |
| 214 | xmalloc (size) |
| 215 | unsigned int size; |
| 216 | { |
| 217 | long *result = (long *) malloc (size); |
| 218 | if (result == NULL) |
| 219 | { |
| 220 | perror ("malloc"); |
| 221 | exit (EXIT_FAILURE); |
| 222 | } |
| 223 | return result; |
| 224 | } |
| 225 | \f |
| 226 | /* |
| 227 | Try to run a different command, or --if no alternate editor is |
| 228 | defined-- exit with an errorcode. |
| 229 | */ |
| 230 | void |
| 231 | fail (argc, argv) |
| 232 | int argc; |
| 233 | char **argv; |
| 234 | { |
| 235 | if (alternate_editor) |
| 236 | { |
| 237 | int i = optind - 1; |
| 238 | execvp (alternate_editor, argv + i); |
| 239 | return; |
| 240 | } |
| 241 | else |
| 242 | { |
| 243 | exit (EXIT_FAILURE); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | |
| 248 | \f |
| 249 | #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM) |
| 250 | |
| 251 | int |
| 252 | main (argc, argv) |
| 253 | int argc; |
| 254 | char **argv; |
| 255 | { |
| 256 | fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n", |
| 257 | argv[0]); |
| 258 | fprintf (stderr, "on systems with Berkeley sockets.\n"); |
| 259 | |
| 260 | fail (argc, argv); |
| 261 | } |
| 262 | |
| 263 | #else /* HAVE_SOCKETS */ |
| 264 | |
| 265 | #include <sys/types.h> |
| 266 | #include <sys/socket.h> |
| 267 | #include <sys/un.h> |
| 268 | #include <sys/stat.h> |
| 269 | #include <errno.h> |
| 270 | |
| 271 | extern char *strerror (); |
| 272 | extern int errno; |
| 273 | |
| 274 | /* Three possibilities: |
| 275 | 2 - can't be `stat'ed (sets errno) |
| 276 | 1 - isn't owned by us |
| 277 | 0 - success: none of the above */ |
| 278 | |
| 279 | static int |
| 280 | socket_status (socket_name) |
| 281 | char *socket_name; |
| 282 | { |
| 283 | struct stat statbfr; |
| 284 | |
| 285 | if (stat (socket_name, &statbfr) == -1) |
| 286 | return 2; |
| 287 | |
| 288 | if (statbfr.st_uid != geteuid ()) |
| 289 | return 1; |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | int |
| 295 | main (argc, argv) |
| 296 | int argc; |
| 297 | char **argv; |
| 298 | { |
| 299 | int s, i, needlf = 0; |
| 300 | FILE *out, *in; |
| 301 | struct sockaddr_un server; |
| 302 | char *cwd, *str; |
| 303 | char string[BUFSIZ]; |
| 304 | |
| 305 | progname = argv[0]; |
| 306 | |
| 307 | /* Process options. */ |
| 308 | decode_options (argc, argv); |
| 309 | |
| 310 | if ((argc - optind < 1) && !eval) |
| 311 | { |
| 312 | fprintf (stderr, "%s: file name or argument required\n", progname); |
| 313 | fprintf (stderr, "Try `%s --help' for more information\n", progname); |
| 314 | exit (EXIT_FAILURE); |
| 315 | } |
| 316 | |
| 317 | /* |
| 318 | * Open up an AF_UNIX socket in this person's home directory |
| 319 | */ |
| 320 | |
| 321 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) |
| 322 | { |
| 323 | fprintf (stderr, "%s: ", argv[0]); |
| 324 | perror ("socket"); |
| 325 | fail (argc, argv); |
| 326 | } |
| 327 | |
| 328 | server.sun_family = AF_UNIX; |
| 329 | |
| 330 | { |
| 331 | int sock_status = 0; |
| 332 | int default_sock = !socket_name; |
| 333 | int saved_errno; |
| 334 | char *server_name = "server"; |
| 335 | |
| 336 | if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\')) |
| 337 | { /* socket_name is a file name component. */ |
| 338 | server_name = socket_name; |
| 339 | socket_name = NULL; |
| 340 | default_sock = 1; /* Try both UIDs. */ |
| 341 | } |
| 342 | |
| 343 | if (default_sock) |
| 344 | { |
| 345 | socket_name = alloca (100 + strlen (server_name)); |
| 346 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 347 | (int) geteuid (), server_name); |
| 348 | } |
| 349 | |
| 350 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 351 | strcpy (server.sun_path, socket_name); |
| 352 | else |
| 353 | { |
| 354 | fprintf (stderr, "%s: socket-name %s too long", |
| 355 | argv[0], socket_name); |
| 356 | exit (EXIT_FAILURE); |
| 357 | } |
| 358 | |
| 359 | /* See if the socket exists, and if it's owned by us. */ |
| 360 | sock_status = socket_status (server.sun_path); |
| 361 | saved_errno = errno; |
| 362 | if (sock_status && default_sock) |
| 363 | { |
| 364 | /* Failing that, see if LOGNAME or USER exist and differ from |
| 365 | our euid. If so, look for a socket based on the UID |
| 366 | associated with the name. This is reminiscent of the logic |
| 367 | that init_editfns uses to set the global Vuser_full_name. */ |
| 368 | |
| 369 | char *user_name = (char *) getenv ("LOGNAME"); |
| 370 | |
| 371 | if (!user_name) |
| 372 | user_name = (char *) getenv ("USER"); |
| 373 | |
| 374 | if (user_name) |
| 375 | { |
| 376 | struct passwd *pw = getpwnam (user_name); |
| 377 | |
| 378 | if (pw && (pw->pw_uid != geteuid ())) |
| 379 | { |
| 380 | /* We're running under su, apparently. */ |
| 381 | socket_name = alloca (100 + strlen (server_name)); |
| 382 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 383 | (int) pw->pw_uid, server_name); |
| 384 | |
| 385 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 386 | strcpy (server.sun_path, socket_name); |
| 387 | else |
| 388 | { |
| 389 | fprintf (stderr, "%s: socket-name %s too long", |
| 390 | argv[0], socket_name); |
| 391 | exit (EXIT_FAILURE); |
| 392 | } |
| 393 | |
| 394 | sock_status = socket_status (server.sun_path); |
| 395 | saved_errno = errno; |
| 396 | } |
| 397 | else |
| 398 | errno = saved_errno; |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | switch (sock_status) |
| 403 | { |
| 404 | case 1: |
| 405 | /* There's a socket, but it isn't owned by us. This is OK if |
| 406 | we are root. */ |
| 407 | if (0 != geteuid ()) |
| 408 | { |
| 409 | fprintf (stderr, "%s: Invalid socket owner\n", argv[0]); |
| 410 | fail (argc, argv); |
| 411 | } |
| 412 | break; |
| 413 | |
| 414 | case 2: |
| 415 | /* `stat' failed */ |
| 416 | if (saved_errno == ENOENT) |
| 417 | fprintf (stderr, |
| 418 | "%s: can't find socket; have you started the server?\n\ |
| 419 | To start the server in Emacs, type \"M-x server-start\".\n", |
| 420 | argv[0]); |
| 421 | else |
| 422 | fprintf (stderr, "%s: can't stat %s: %s\n", |
| 423 | argv[0], server.sun_path, strerror (saved_errno)); |
| 424 | fail (argc, argv); |
| 425 | break; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
| 430 | < 0) |
| 431 | { |
| 432 | fprintf (stderr, "%s: ", argv[0]); |
| 433 | perror ("connect"); |
| 434 | fail (argc, argv); |
| 435 | } |
| 436 | |
| 437 | /* We use the stream OUT to send our command to the server. */ |
| 438 | if ((out = fdopen (s, "r+")) == NULL) |
| 439 | { |
| 440 | fprintf (stderr, "%s: ", argv[0]); |
| 441 | perror ("fdopen"); |
| 442 | fail (argc, argv); |
| 443 | } |
| 444 | |
| 445 | /* We use the stream IN to read the response. |
| 446 | We used to use just one stream for both output and input |
| 447 | on the socket, but reversing direction works nonportably: |
| 448 | on some systems, the output appears as the first input; |
| 449 | on other systems it does not. */ |
| 450 | if ((in = fdopen (s, "r+")) == NULL) |
| 451 | { |
| 452 | fprintf (stderr, "%s: ", argv[0]); |
| 453 | perror ("fdopen"); |
| 454 | fail (argc, argv); |
| 455 | } |
| 456 | |
| 457 | #ifdef HAVE_GETCWD |
| 458 | cwd = getcwd (string, sizeof string); |
| 459 | #else |
| 460 | cwd = getwd (string); |
| 461 | #endif |
| 462 | if (cwd == 0) |
| 463 | { |
| 464 | /* getwd puts message in STRING if it fails. */ |
| 465 | |
| 466 | #ifdef HAVE_GETCWD |
| 467 | fprintf (stderr, "%s: %s (%s)\n", argv[0], |
| 468 | "Cannot get current working directory", strerror (errno)); |
| 469 | #else |
| 470 | fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno)); |
| 471 | #endif |
| 472 | fail (argc, argv); |
| 473 | } |
| 474 | |
| 475 | if (nowait) |
| 476 | fprintf (out, "-nowait "); |
| 477 | |
| 478 | if (eval) |
| 479 | fprintf (out, "-eval "); |
| 480 | |
| 481 | if (display) |
| 482 | { |
| 483 | fprintf (out, "-display "); |
| 484 | quote_file_name (display, out); |
| 485 | fprintf (out, " "); |
| 486 | } |
| 487 | |
| 488 | if ((argc - optind > 0)) |
| 489 | { |
| 490 | for (i = optind; i < argc; i++) |
| 491 | { |
| 492 | if (eval) |
| 493 | ; /* Don't prepend any cwd or anything like that. */ |
| 494 | else if (*argv[i] == '+') |
| 495 | { |
| 496 | char *p = argv[i] + 1; |
| 497 | while (isdigit ((unsigned char) *p) || *p == ':') p++; |
| 498 | if (*p != 0) |
| 499 | { |
| 500 | quote_file_name (cwd, out); |
| 501 | fprintf (out, "/"); |
| 502 | } |
| 503 | } |
| 504 | else if (*argv[i] != '/') |
| 505 | { |
| 506 | quote_file_name (cwd, out); |
| 507 | fprintf (out, "/"); |
| 508 | } |
| 509 | |
| 510 | quote_file_name (argv[i], out); |
| 511 | fprintf (out, " "); |
| 512 | } |
| 513 | } |
| 514 | else |
| 515 | { |
| 516 | while ((str = fgets (string, BUFSIZ, stdin))) |
| 517 | { |
| 518 | quote_file_name (str, out); |
| 519 | } |
| 520 | fprintf (out, " "); |
| 521 | } |
| 522 | |
| 523 | fprintf (out, "\n"); |
| 524 | fflush (out); |
| 525 | |
| 526 | /* Maybe wait for an answer. */ |
| 527 | if (nowait) |
| 528 | return EXIT_SUCCESS; |
| 529 | |
| 530 | if (!eval) |
| 531 | { |
| 532 | printf ("Waiting for Emacs..."); |
| 533 | needlf = 2; |
| 534 | } |
| 535 | fflush (stdout); |
| 536 | |
| 537 | /* Now, wait for an answer and print any messages. */ |
| 538 | while ((str = fgets (string, BUFSIZ, in))) |
| 539 | { |
| 540 | if (needlf == 2) |
| 541 | printf ("\n"); |
| 542 | printf ("%s", str); |
| 543 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; |
| 544 | } |
| 545 | |
| 546 | if (needlf) |
| 547 | printf ("\n"); |
| 548 | fflush (stdout); |
| 549 | |
| 550 | return EXIT_SUCCESS; |
| 551 | } |
| 552 | |
| 553 | #endif /* HAVE_SOCKETS */ |
| 554 | \f |
| 555 | #ifndef HAVE_STRERROR |
| 556 | char * |
| 557 | strerror (errnum) |
| 558 | int errnum; |
| 559 | { |
| 560 | extern char *sys_errlist[]; |
| 561 | extern int sys_nerr; |
| 562 | |
| 563 | if (errnum >= 0 && errnum < sys_nerr) |
| 564 | return sys_errlist[errnum]; |
| 565 | return (char *) "Unknown error"; |
| 566 | } |
| 567 | |
| 568 | #endif /* ! HAVE_STRERROR */ |
| 569 | |
| 570 | /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 |
| 571 | (do not change this comment) */ |
| 572 | |
| 573 | /* emacsclient.c ends here */ |