| 1 | /* Client process that communicates with GNU Emacs acting as server. |
| 2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006 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., 51 Franklin Street, Fifth Floor, |
| 20 | Boston, MA 02110-1301, USA. */ |
| 21 | |
| 22 | |
| 23 | #define NO_SHORTNAMES |
| 24 | |
| 25 | #ifdef HAVE_CONFIG_H |
| 26 | #include <config.h> |
| 27 | #endif |
| 28 | |
| 29 | #ifdef WINDOWSNT |
| 30 | |
| 31 | /* config.h defines these, which disables sockets altogether! */ |
| 32 | # undef _WINSOCKAPI_ |
| 33 | # undef _WINSOCK_H |
| 34 | |
| 35 | # include <malloc.h> |
| 36 | # include <stdlib.h> |
| 37 | # include <windows.h> |
| 38 | |
| 39 | # define NO_SOCKETS_IN_FILE_SYSTEM |
| 40 | |
| 41 | # define HSOCKET SOCKET |
| 42 | # define CLOSE_SOCKET closesocket |
| 43 | # define INITIALIZE() (initialize_sockets ()) |
| 44 | |
| 45 | #else /* !WINDOWSNT */ |
| 46 | |
| 47 | # include <sys/types.h> |
| 48 | |
| 49 | # ifdef HAVE_INET_SOCKETS |
| 50 | # include <netinet/in.h> |
| 51 | # endif |
| 52 | |
| 53 | # define INVALID_SOCKET -1 |
| 54 | # define HSOCKET int |
| 55 | # define CLOSE_SOCKET close |
| 56 | # define INITIALIZE() |
| 57 | |
| 58 | #endif /* !WINDOWSNT */ |
| 59 | |
| 60 | #undef signal |
| 61 | |
| 62 | #include <stdarg.h> |
| 63 | #include <ctype.h> |
| 64 | #include <stdio.h> |
| 65 | #include "getopt.h" |
| 66 | #ifdef HAVE_UNISTD_H |
| 67 | #include <unistd.h> |
| 68 | #endif |
| 69 | |
| 70 | #ifdef VMS |
| 71 | # include "vms-pwd.h" |
| 72 | #else /* not VMS */ |
| 73 | #ifdef WINDOWSNT |
| 74 | # include <io.h> |
| 75 | #else /* not WINDOWSNT */ |
| 76 | # include <pwd.h> |
| 77 | #endif /* not WINDOWSNT */ |
| 78 | #endif /* not VMS */ |
| 79 | |
| 80 | char *getenv (), *getwd (); |
| 81 | char *(getcwd) (); |
| 82 | |
| 83 | #ifndef VERSION |
| 84 | #define VERSION "unspecified" |
| 85 | #endif |
| 86 | \f |
| 87 | #define SEND_STRING(data) (send_to_emacs (s, (data))) |
| 88 | #define SEND_QUOTED(data) (quote_file_name (s, (data))) |
| 89 | |
| 90 | #ifndef EXIT_SUCCESS |
| 91 | #define EXIT_SUCCESS 0 |
| 92 | #endif |
| 93 | |
| 94 | #ifndef EXIT_FAILURE |
| 95 | #define EXIT_FAILURE 1 |
| 96 | #endif |
| 97 | |
| 98 | #ifndef FALSE |
| 99 | #define FALSE 0 |
| 100 | #endif |
| 101 | |
| 102 | #ifndef TRUE |
| 103 | #define TRUE 1 |
| 104 | #endif |
| 105 | |
| 106 | #ifndef NO_RETURN |
| 107 | #define NO_RETURN |
| 108 | #endif |
| 109 | \f |
| 110 | /* Name used to invoke this program. */ |
| 111 | char *progname; |
| 112 | |
| 113 | /* Nonzero means don't wait for a response from Emacs. --no-wait. */ |
| 114 | int nowait = 0; |
| 115 | |
| 116 | /* Nonzero means args are expressions to be evaluated. --eval. */ |
| 117 | int eval = 0; |
| 118 | |
| 119 | /* The display on which Emacs should work. --display. */ |
| 120 | char *display = NULL; |
| 121 | |
| 122 | /* If non-NULL, the name of an editor to fallback to if the server |
| 123 | is not running. --alternate-editor. */ |
| 124 | const char *alternate_editor = NULL; |
| 125 | |
| 126 | /* If non-NULL, the filename of the UNIX socket. */ |
| 127 | char *socket_name = NULL; |
| 128 | |
| 129 | /* If non-NULL, the filename of the authentication file. */ |
| 130 | char *server_file = NULL; |
| 131 | |
| 132 | void print_help_and_exit () NO_RETURN; |
| 133 | |
| 134 | struct option longopts[] = |
| 135 | { |
| 136 | { "no-wait", no_argument, NULL, 'n' }, |
| 137 | { "eval", no_argument, NULL, 'e' }, |
| 138 | { "help", no_argument, NULL, 'H' }, |
| 139 | { "version", no_argument, NULL, 'V' }, |
| 140 | { "alternate-editor", required_argument, NULL, 'a' }, |
| 141 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 142 | { "socket-name", required_argument, NULL, 's' }, |
| 143 | #endif |
| 144 | { "server-file", required_argument, NULL, 'f' }, |
| 145 | { "display", required_argument, NULL, 'd' }, |
| 146 | { 0, 0, 0, 0 } |
| 147 | }; |
| 148 | |
| 149 | /* Message functions. */ |
| 150 | |
| 151 | #ifdef WINDOWSNT |
| 152 | /* I first tried to check for STDOUT. The check did not work, |
| 153 | I get a valid handle also in nonconsole apps. |
| 154 | Instead I test for console title, which seems to work. */ |
| 155 | int |
| 156 | w32_window_app() |
| 157 | { |
| 158 | static int window_app = -1; |
| 159 | char szTitle[MAX_PATH]; |
| 160 | |
| 161 | if (window_app < 0) |
| 162 | window_app = (GetConsoleTitleA (szTitle, MAX_PATH) == 0); |
| 163 | |
| 164 | return window_app; |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | void |
| 169 | message (int is_error, char *message, ...) |
| 170 | { |
| 171 | char buf [2048]; |
| 172 | char *msg = buf; |
| 173 | va_list args; |
| 174 | |
| 175 | va_start (args, message); |
| 176 | |
| 177 | if (is_error) |
| 178 | { |
| 179 | sprintf (buf, "%s: ", progname); |
| 180 | msg = strchr (buf, '\0'); |
| 181 | } |
| 182 | |
| 183 | vsprintf (msg, message, args); |
| 184 | va_end (args); |
| 185 | |
| 186 | #ifdef WINDOWSNT |
| 187 | if (w32_window_app ()) |
| 188 | { |
| 189 | if (is_error) |
| 190 | MessageBox (NULL, msg, "Emacsclient ERROR", MB_ICONERROR); |
| 191 | else |
| 192 | MessageBox (NULL, msg, "Emacsclient", MB_ICONINFORMATION); |
| 193 | } |
| 194 | else |
| 195 | #endif |
| 196 | fprintf (is_error ? stderr : stdout, msg); |
| 197 | } |
| 198 | |
| 199 | /* Decode the options from argv and argc. |
| 200 | The global variable `optind' will say how many arguments we used up. */ |
| 201 | |
| 202 | void |
| 203 | decode_options (argc, argv) |
| 204 | int argc; |
| 205 | char **argv; |
| 206 | { |
| 207 | alternate_editor = getenv ("ALTERNATE_EDITOR"); |
| 208 | |
| 209 | while (1) |
| 210 | { |
| 211 | int opt = getopt_long (argc, argv, |
| 212 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 213 | "VHnea:s:f:d:", |
| 214 | #else |
| 215 | "VHnea:f:d:", |
| 216 | #endif |
| 217 | longopts, 0); |
| 218 | |
| 219 | if (opt == EOF) |
| 220 | break; |
| 221 | |
| 222 | switch (opt) |
| 223 | { |
| 224 | case 0: |
| 225 | /* If getopt returns 0, then it has already processed a |
| 226 | long-named option. We should do nothing. */ |
| 227 | break; |
| 228 | |
| 229 | case 'a': |
| 230 | alternate_editor = optarg; |
| 231 | break; |
| 232 | |
| 233 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 234 | case 's': |
| 235 | socket_name = optarg; |
| 236 | break; |
| 237 | #endif |
| 238 | |
| 239 | case 'f': |
| 240 | server_file = optarg; |
| 241 | break; |
| 242 | |
| 243 | case 'd': |
| 244 | display = optarg; |
| 245 | break; |
| 246 | |
| 247 | case 'n': |
| 248 | nowait = 1; |
| 249 | break; |
| 250 | |
| 251 | case 'e': |
| 252 | eval = 1; |
| 253 | break; |
| 254 | |
| 255 | case 'V': |
| 256 | message (FALSE, "emacsclient %s\n", VERSION); |
| 257 | exit (EXIT_SUCCESS); |
| 258 | break; |
| 259 | |
| 260 | case 'H': |
| 261 | print_help_and_exit (); |
| 262 | break; |
| 263 | |
| 264 | default: |
| 265 | message (TRUE, "Try `%s --help' for more information\n", progname); |
| 266 | exit (EXIT_FAILURE); |
| 267 | break; |
| 268 | } |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | void |
| 273 | print_help_and_exit () |
| 274 | { |
| 275 | message (FALSE, |
| 276 | "Usage: %s [OPTIONS] FILE...\n\ |
| 277 | Tell the Emacs server to visit the specified files.\n\ |
| 278 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ |
| 279 | \n\ |
| 280 | The following OPTIONS are accepted:\n\ |
| 281 | \n\ |
| 282 | -V, --version Just print version info and return\n\ |
| 283 | -H, --help Print this usage information message\n\ |
| 284 | -e, --eval Evaluate FILE arguments as Lisp expressions\n\ |
| 285 | -n, --no-wait Don't wait for the server to return\n\ |
| 286 | -d, --display=DISPLAY Visit the file in the given display\n" |
| 287 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 288 | "-s, --socket-name=FILENAME\n\ |
| 289 | Set filename of the UNIX socket for communication\n" |
| 290 | #endif |
| 291 | "-f, --server-file=FILENAME\n\ |
| 292 | Set filename of the TCP authentication file\n\ |
| 293 | -a, --alternate-editor=EDITOR\n\ |
| 294 | Editor to fallback to if server is not running\n\ |
| 295 | \n\ |
| 296 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); |
| 297 | exit (EXIT_SUCCESS); |
| 298 | } |
| 299 | |
| 300 | \f |
| 301 | /* |
| 302 | Try to run a different command, or --if no alternate editor is |
| 303 | defined-- exit with an errorcode. |
| 304 | */ |
| 305 | void |
| 306 | fail (argc, argv) |
| 307 | int argc; |
| 308 | char **argv; |
| 309 | { |
| 310 | if (alternate_editor) |
| 311 | { |
| 312 | int i = optind - 1; |
| 313 | #ifdef WINDOWSNT |
| 314 | argv[i] = (char *)alternate_editor; |
| 315 | #endif |
| 316 | execvp (alternate_editor, argv + i); |
| 317 | message (TRUE, "%s: error executing alternate editor \"%s\"\n", |
| 318 | progname, alternate_editor); |
| 319 | } |
| 320 | exit (EXIT_FAILURE); |
| 321 | } |
| 322 | |
| 323 | \f |
| 324 | #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS) |
| 325 | |
| 326 | int |
| 327 | main (argc, argv) |
| 328 | int argc; |
| 329 | char **argv; |
| 330 | { |
| 331 | message (TRUE, "%s: Sorry, the Emacs server is supported only\non systems with Berkely sockets.\n", |
| 332 | argv[0]); |
| 333 | |
| 334 | fail (argc, argv); |
| 335 | } |
| 336 | |
| 337 | #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ |
| 338 | |
| 339 | #ifdef WINDOWSNT |
| 340 | # include <winsock2.h> |
| 341 | #else |
| 342 | # include <sys/types.h> |
| 343 | # include <sys/socket.h> |
| 344 | # include <sys/un.h> |
| 345 | # include <sys/stat.h> |
| 346 | # include <errno.h> |
| 347 | #endif |
| 348 | |
| 349 | #define AUTH_KEY_LENGTH 64 |
| 350 | #define SEND_BUFFER_SIZE 4096 |
| 351 | |
| 352 | extern char *strerror (); |
| 353 | extern int errno; |
| 354 | |
| 355 | /* Buffer to accumulate data to send in TCP connections. */ |
| 356 | char send_buffer[SEND_BUFFER_SIZE + 1]; |
| 357 | int sblen = 0; /* Fill pointer for the send buffer. */ |
| 358 | |
| 359 | /* Let's send the data to Emacs when either |
| 360 | - the data ends in "\n", or |
| 361 | - the buffer is full (but this shouldn't happen) |
| 362 | Otherwise, we just accumulate it. */ |
| 363 | void |
| 364 | send_to_emacs (s, data) |
| 365 | HSOCKET s; |
| 366 | char *data; |
| 367 | { |
| 368 | while (data) |
| 369 | { |
| 370 | int dlen = strlen (data); |
| 371 | if (dlen + sblen >= SEND_BUFFER_SIZE) |
| 372 | { |
| 373 | int part = SEND_BUFFER_SIZE - sblen; |
| 374 | strncpy (&send_buffer[sblen], data, part); |
| 375 | data += part; |
| 376 | sblen = SEND_BUFFER_SIZE; |
| 377 | } |
| 378 | else if (dlen) |
| 379 | { |
| 380 | strcpy (&send_buffer[sblen], data); |
| 381 | data = NULL; |
| 382 | sblen += dlen; |
| 383 | } |
| 384 | else |
| 385 | break; |
| 386 | |
| 387 | if (sblen == SEND_BUFFER_SIZE |
| 388 | || (sblen > 0 && send_buffer[sblen-1] == '\n')) |
| 389 | { |
| 390 | int sent = send (s, send_buffer, sblen, 0); |
| 391 | if (sent != sblen) |
| 392 | strcpy (send_buffer, &send_buffer[sent]); |
| 393 | sblen -= sent; |
| 394 | } |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | /* In NAME, insert a & before each &, each space, each newline, and |
| 399 | any initial -. Change spaces to underscores, too, so that the |
| 400 | return value never contains a space. */ |
| 401 | void |
| 402 | quote_file_name (s, name) |
| 403 | HSOCKET s; |
| 404 | char *name; |
| 405 | { |
| 406 | char *copy = (char *) malloc (strlen (name) * 2 + 1); |
| 407 | char *p, *q; |
| 408 | |
| 409 | p = name; |
| 410 | q = copy; |
| 411 | while (*p) |
| 412 | { |
| 413 | if (*p == ' ') |
| 414 | { |
| 415 | *q++ = '&'; |
| 416 | *q++ = '_'; |
| 417 | p++; |
| 418 | } |
| 419 | else if (*p == '\n') |
| 420 | { |
| 421 | *q++ = '&'; |
| 422 | *q++ = 'n'; |
| 423 | p++; |
| 424 | } |
| 425 | else |
| 426 | { |
| 427 | if (*p == '&' || (*p == '-' && p == name)) |
| 428 | *q++ = '&'; |
| 429 | *q++ = *p++; |
| 430 | } |
| 431 | } |
| 432 | *q++ = 0; |
| 433 | |
| 434 | SEND_STRING (copy); |
| 435 | |
| 436 | free (copy); |
| 437 | } |
| 438 | |
| 439 | int |
| 440 | file_name_absolute_p (filename) |
| 441 | const unsigned char *filename; |
| 442 | { |
| 443 | /* Sanity check, it shouldn't happen. */ |
| 444 | if (! filename) return FALSE; |
| 445 | |
| 446 | /* /xxx is always an absolute path. */ |
| 447 | if (filename[0] == '/') return TRUE; |
| 448 | |
| 449 | /* Empty filenames (which shouldn't happen) are relative. */ |
| 450 | if (filename[0] == '\0') return FALSE; |
| 451 | |
| 452 | #ifdef WINDOWSNT |
| 453 | /* X:\xxx is always absolute; X:xxx is an error and will fail. */ |
| 454 | if (isalpha (filename[0]) |
| 455 | && filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/')) |
| 456 | return TRUE; |
| 457 | |
| 458 | /* Both \xxx and \\xxx\yyy are absolute. */ |
| 459 | if (filename[0] == '\\') return TRUE; |
| 460 | #endif |
| 461 | |
| 462 | return FALSE; |
| 463 | } |
| 464 | |
| 465 | #ifdef WINDOWSNT |
| 466 | /* Wrapper to make WSACleanup a cdecl, as required by atexit(). */ |
| 467 | void |
| 468 | __cdecl close_winsock () |
| 469 | { |
| 470 | WSACleanup (); |
| 471 | } |
| 472 | |
| 473 | /* Initialize the WinSock2 library. */ |
| 474 | void |
| 475 | initialize_sockets () |
| 476 | { |
| 477 | WSADATA wsaData; |
| 478 | |
| 479 | if (WSAStartup (MAKEWORD (2, 0), &wsaData)) |
| 480 | { |
| 481 | message (TRUE, "%s: error initializing WinSock2", progname); |
| 482 | exit (EXIT_FAILURE); |
| 483 | } |
| 484 | |
| 485 | atexit (close_winsock); |
| 486 | } |
| 487 | #endif /* WINDOWSNT */ |
| 488 | \f |
| 489 | /* |
| 490 | * Read the information needed to set up a TCP comm channel with |
| 491 | * the Emacs server: host, port, pid and authentication string. |
| 492 | */ |
| 493 | int |
| 494 | get_server_config (server, authentication) |
| 495 | struct sockaddr_in *server; |
| 496 | char *authentication; |
| 497 | { |
| 498 | char dotted[32]; |
| 499 | char *port; |
| 500 | char *pid; |
| 501 | FILE *config = NULL; |
| 502 | |
| 503 | if (file_name_absolute_p (server_file)) |
| 504 | config = fopen (server_file, "rb"); |
| 505 | else |
| 506 | { |
| 507 | char *home = getenv ("HOME"); |
| 508 | |
| 509 | if (home) |
| 510 | { |
| 511 | char *path = alloca (32 + strlen (home) + strlen (server_file)); |
| 512 | sprintf (path, "%s/.emacs.d/server/%s", home, server_file); |
| 513 | config = fopen (path, "rb"); |
| 514 | } |
| 515 | #ifdef WINDOWSNT |
| 516 | if (!config && (home = getenv ("APPDATA"))) |
| 517 | { |
| 518 | char *path = alloca (32 + strlen (home) + strlen (server_file)); |
| 519 | sprintf (path, "%s/.emacs.d/server/%s", home, server_file); |
| 520 | config = fopen (path, "rb"); |
| 521 | } |
| 522 | #endif |
| 523 | } |
| 524 | |
| 525 | if (! config) |
| 526 | return FALSE; |
| 527 | |
| 528 | if (fgets (dotted, sizeof dotted, config) |
| 529 | && (port = strchr (dotted, ':')) |
| 530 | && (pid = strchr (port, ' '))) |
| 531 | { |
| 532 | *port++ = '\0'; |
| 533 | *pid++ = '\0'; |
| 534 | } |
| 535 | else |
| 536 | { |
| 537 | message (TRUE, "%s: invalid configuration info", progname); |
| 538 | exit (EXIT_FAILURE); |
| 539 | } |
| 540 | |
| 541 | server->sin_family = AF_INET; |
| 542 | server->sin_addr.s_addr = inet_addr (dotted); |
| 543 | server->sin_port = htons (atoi (port)); |
| 544 | |
| 545 | if (! fread (authentication, AUTH_KEY_LENGTH, 1, config)) |
| 546 | { |
| 547 | message (TRUE, "%s: cannot read authentication info", progname); |
| 548 | exit (EXIT_FAILURE); |
| 549 | } |
| 550 | |
| 551 | fclose (config); |
| 552 | |
| 553 | #ifdef WINDOWSNT |
| 554 | /* |
| 555 | Modern Windows restrict which processes can set the foreground window. |
| 556 | So, for emacsclient to be able to force Emacs into the foreground, we |
| 557 | have to call AllowSetForegroundWindow(). Unfortunately, older Windows |
| 558 | (W95, W98 and NT) don't have this function, so we have to check first. |
| 559 | |
| 560 | We're doing this here because it has to be done before sending info |
| 561 | to Emacs, and otherwise we'll need a global variable just to pass around |
| 562 | the pid, which is also inelegant. |
| 563 | */ |
| 564 | { |
| 565 | HMODULE hUser32; |
| 566 | |
| 567 | if (hUser32 = LoadLibrary ("user32.dll")) |
| 568 | { |
| 569 | FARPROC set_fg; |
| 570 | if (set_fg = GetProcAddress (hUser32, "AllowSetForegroundWindow")) |
| 571 | set_fg (atoi (pid)); |
| 572 | FreeLibrary (hUser32); |
| 573 | } |
| 574 | } |
| 575 | #endif |
| 576 | |
| 577 | return TRUE; |
| 578 | } |
| 579 | |
| 580 | HSOCKET |
| 581 | set_tcp_socket () |
| 582 | { |
| 583 | HSOCKET s; |
| 584 | struct sockaddr_in server; |
| 585 | struct linger l_arg = {1, 1}; |
| 586 | char auth_string[AUTH_KEY_LENGTH + 1]; |
| 587 | |
| 588 | if (! get_server_config (&server, auth_string)) |
| 589 | return INVALID_SOCKET; |
| 590 | |
| 591 | if (server.sin_addr.s_addr != inet_addr ("127.0.0.1")) |
| 592 | message (TRUE, "%s: connected to remote socket at %s\n", |
| 593 | progname, inet_ntoa (server.sin_addr)); |
| 594 | |
| 595 | /* |
| 596 | * Open up an AF_INET socket |
| 597 | */ |
| 598 | if ((s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) |
| 599 | { |
| 600 | message (TRUE, "%s: socket: %s\n", progname, strerror (errno)); |
| 601 | return INVALID_SOCKET; |
| 602 | } |
| 603 | |
| 604 | /* |
| 605 | * Set up the socket |
| 606 | */ |
| 607 | if (connect (s, (struct sockaddr *) &server, sizeof server) < 0) |
| 608 | { |
| 609 | message (TRUE, "%s: connect: %s\n", progname, strerror (errno)); |
| 610 | return INVALID_SOCKET; |
| 611 | } |
| 612 | |
| 613 | setsockopt (s, SOL_SOCKET, SO_LINGER, (char *) &l_arg, sizeof l_arg); |
| 614 | |
| 615 | /* |
| 616 | * Send the authentication |
| 617 | */ |
| 618 | auth_string[AUTH_KEY_LENGTH] = '\0'; |
| 619 | |
| 620 | SEND_STRING ("-auth "); |
| 621 | SEND_STRING (auth_string); |
| 622 | SEND_STRING ("\n"); |
| 623 | |
| 624 | return s; |
| 625 | } |
| 626 | |
| 627 | #if !defined (NO_SOCKETS_IN_FILE_SYSTEM) |
| 628 | |
| 629 | /* Three possibilities: |
| 630 | 2 - can't be `stat'ed (sets errno) |
| 631 | 1 - isn't owned by us |
| 632 | 0 - success: none of the above */ |
| 633 | |
| 634 | static int |
| 635 | socket_status (socket_name) |
| 636 | char *socket_name; |
| 637 | { |
| 638 | struct stat statbfr; |
| 639 | |
| 640 | if (stat (socket_name, &statbfr) == -1) |
| 641 | return 2; |
| 642 | |
| 643 | if (statbfr.st_uid != geteuid ()) |
| 644 | return 1; |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | HSOCKET |
| 650 | set_local_socket () |
| 651 | { |
| 652 | HSOCKET s; |
| 653 | struct sockaddr_un server; |
| 654 | |
| 655 | /* |
| 656 | * Open up an AF_UNIX socket in this person's home directory |
| 657 | */ |
| 658 | |
| 659 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) |
| 660 | { |
| 661 | message (TRUE, "%s: socket: %s\n", progname, strerror (errno)); |
| 662 | return INVALID_SOCKET; |
| 663 | } |
| 664 | |
| 665 | server.sun_family = AF_UNIX; |
| 666 | |
| 667 | { |
| 668 | int sock_status = 0; |
| 669 | int default_sock = !socket_name; |
| 670 | int saved_errno; |
| 671 | char *server_name = "server"; |
| 672 | |
| 673 | if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\')) |
| 674 | { /* socket_name is a file name component. */ |
| 675 | server_name = socket_name; |
| 676 | socket_name = NULL; |
| 677 | default_sock = 1; /* Try both UIDs. */ |
| 678 | } |
| 679 | |
| 680 | if (default_sock) |
| 681 | { |
| 682 | socket_name = alloca (100 + strlen (server_name)); |
| 683 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 684 | (int) geteuid (), server_name); |
| 685 | } |
| 686 | |
| 687 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 688 | strcpy (server.sun_path, socket_name); |
| 689 | else |
| 690 | { |
| 691 | message (TRUE, "%s: socket-name %s too long", |
| 692 | progname, socket_name); |
| 693 | exit (EXIT_FAILURE); |
| 694 | } |
| 695 | |
| 696 | /* See if the socket exists, and if it's owned by us. */ |
| 697 | sock_status = socket_status (server.sun_path); |
| 698 | saved_errno = errno; |
| 699 | if (sock_status && default_sock) |
| 700 | { |
| 701 | /* Failing that, see if LOGNAME or USER exist and differ from |
| 702 | our euid. If so, look for a socket based on the UID |
| 703 | associated with the name. This is reminiscent of the logic |
| 704 | that init_editfns uses to set the global Vuser_full_name. */ |
| 705 | |
| 706 | char *user_name = (char *) getenv ("LOGNAME"); |
| 707 | |
| 708 | if (!user_name) |
| 709 | user_name = (char *) getenv ("USER"); |
| 710 | |
| 711 | if (user_name) |
| 712 | { |
| 713 | struct passwd *pw = getpwnam (user_name); |
| 714 | |
| 715 | if (pw && (pw->pw_uid != geteuid ())) |
| 716 | { |
| 717 | /* We're running under su, apparently. */ |
| 718 | socket_name = alloca (100 + strlen (server_name)); |
| 719 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 720 | (int) pw->pw_uid, server_name); |
| 721 | |
| 722 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 723 | strcpy (server.sun_path, socket_name); |
| 724 | else |
| 725 | { |
| 726 | message (TRUE, "%s: socket-name %s too long", |
| 727 | progname, socket_name); |
| 728 | exit (EXIT_FAILURE); |
| 729 | } |
| 730 | |
| 731 | sock_status = socket_status (server.sun_path); |
| 732 | saved_errno = errno; |
| 733 | } |
| 734 | else |
| 735 | errno = saved_errno; |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | switch (sock_status) |
| 740 | { |
| 741 | case 1: |
| 742 | /* There's a socket, but it isn't owned by us. This is OK if |
| 743 | we are root. */ |
| 744 | if (0 != geteuid ()) |
| 745 | { |
| 746 | message (TRUE, "%s: Invalid socket owner\n", progname); |
| 747 | return INVALID_SOCKET; |
| 748 | } |
| 749 | break; |
| 750 | |
| 751 | case 2: |
| 752 | /* `stat' failed */ |
| 753 | if (saved_errno == ENOENT) |
| 754 | message (TRUE, |
| 755 | "%s: can't find socket; have you started the server?\n\ |
| 756 | To start the server in Emacs, type \"M-x server-start\".\n", |
| 757 | progname); |
| 758 | else |
| 759 | message (TRUE, "%s: can't stat %s: %s\n", |
| 760 | progname, server.sun_path, strerror (saved_errno)); |
| 761 | return INVALID_SOCKET; |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
| 766 | < 0) |
| 767 | { |
| 768 | message (TRUE, "%s: connect: %s\n", progname, strerror (errno)); |
| 769 | return INVALID_SOCKET; |
| 770 | } |
| 771 | |
| 772 | return s; |
| 773 | } |
| 774 | #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */ |
| 775 | |
| 776 | HSOCKET |
| 777 | set_socket () |
| 778 | { |
| 779 | HSOCKET s; |
| 780 | |
| 781 | INITIALIZE (); |
| 782 | |
| 783 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 784 | /* Explicit --socket-name argument. */ |
| 785 | if (socket_name) |
| 786 | { |
| 787 | s = set_local_socket (); |
| 788 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 789 | return s; |
| 790 | |
| 791 | message (TRUE, "%s: error accessing socket \"%s\"", |
| 792 | progname, socket_name); |
| 793 | exit (EXIT_FAILURE); |
| 794 | } |
| 795 | #endif |
| 796 | |
| 797 | /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */ |
| 798 | if (!server_file) |
| 799 | server_file = getenv ("EMACS_SERVER_FILE"); |
| 800 | |
| 801 | if (server_file) |
| 802 | { |
| 803 | s = set_tcp_socket (); |
| 804 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 805 | return s; |
| 806 | |
| 807 | message (TRUE, "%s: error accessing server file \"%s\"", |
| 808 | progname, server_file); |
| 809 | exit (EXIT_FAILURE); |
| 810 | } |
| 811 | |
| 812 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 813 | /* Implicit local socket. */ |
| 814 | s = set_local_socket (); |
| 815 | if (s != INVALID_SOCKET) |
| 816 | return s; |
| 817 | #endif |
| 818 | |
| 819 | /* Implicit server file. */ |
| 820 | server_file = "server"; |
| 821 | s = set_tcp_socket (); |
| 822 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 823 | return s; |
| 824 | |
| 825 | /* No implicit or explicit socket, and no alternate editor. */ |
| 826 | message (TRUE, "%s: No socket or alternate editor. Please use:\n\n" |
| 827 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 828 | "\t--socket-name\n" |
| 829 | #endif |
| 830 | "\t--server-file (or environment variable EMACS_SERVER_FILE)\n\ |
| 831 | \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n", |
| 832 | progname); |
| 833 | exit (EXIT_FAILURE); |
| 834 | } |
| 835 | |
| 836 | int |
| 837 | main (argc, argv) |
| 838 | int argc; |
| 839 | char **argv; |
| 840 | { |
| 841 | HSOCKET s; |
| 842 | int i, rl, needlf = 0; |
| 843 | char *cwd; |
| 844 | char string[BUFSIZ+1]; |
| 845 | |
| 846 | progname = argv[0]; |
| 847 | |
| 848 | /* Process options. */ |
| 849 | decode_options (argc, argv); |
| 850 | |
| 851 | if ((argc - optind < 1) && !eval) |
| 852 | { |
| 853 | message (TRUE, "%s: file name or argument required\nTry `%s --help' for more information\n", |
| 854 | progname, progname); |
| 855 | exit (EXIT_FAILURE); |
| 856 | } |
| 857 | |
| 858 | if ((s = set_socket ()) == INVALID_SOCKET) |
| 859 | fail (argc, argv); |
| 860 | |
| 861 | #ifdef HAVE_GETCWD |
| 862 | cwd = getcwd (string, sizeof string); |
| 863 | #else |
| 864 | cwd = getwd (string); |
| 865 | #endif |
| 866 | if (cwd == 0) |
| 867 | { |
| 868 | /* getwd puts message in STRING if it fails. */ |
| 869 | #ifdef HAVE_GETCWD |
| 870 | message (TRUE, "%s: %s (%s)\n", progname, |
| 871 | "Cannot get current working directory", strerror (errno)); |
| 872 | #else |
| 873 | message (TRUE, "%s: %s (%s)\n", progname, string, strerror (errno)); |
| 874 | #endif |
| 875 | fail (argc, argv); |
| 876 | } |
| 877 | |
| 878 | if (nowait) |
| 879 | SEND_STRING ("-nowait "); |
| 880 | |
| 881 | if (eval) |
| 882 | SEND_STRING ("-eval "); |
| 883 | |
| 884 | if (display) |
| 885 | { |
| 886 | SEND_STRING ("-display "); |
| 887 | SEND_QUOTED (display); |
| 888 | SEND_STRING (" "); |
| 889 | } |
| 890 | |
| 891 | if ((argc - optind > 0)) |
| 892 | { |
| 893 | for (i = optind; i < argc; i++) |
| 894 | { |
| 895 | if (eval) |
| 896 | ; /* Don't prepend any cwd or anything like that. */ |
| 897 | else if (*argv[i] == '+') |
| 898 | { |
| 899 | char *p = argv[i] + 1; |
| 900 | while (isdigit ((unsigned char) *p) || *p == ':') p++; |
| 901 | if (*p != 0) |
| 902 | { |
| 903 | SEND_QUOTED (cwd); |
| 904 | SEND_STRING ("/"); |
| 905 | } |
| 906 | } |
| 907 | else if (! file_name_absolute_p (argv[i])) |
| 908 | { |
| 909 | SEND_QUOTED (cwd); |
| 910 | SEND_STRING ("/"); |
| 911 | } |
| 912 | |
| 913 | SEND_QUOTED (argv[i]); |
| 914 | SEND_STRING (" "); |
| 915 | } |
| 916 | } |
| 917 | else |
| 918 | { |
| 919 | while (fgets (string, BUFSIZ, stdin)) |
| 920 | { |
| 921 | SEND_QUOTED (string); |
| 922 | } |
| 923 | SEND_STRING (" "); |
| 924 | } |
| 925 | |
| 926 | SEND_STRING ("\n"); |
| 927 | |
| 928 | /* Maybe wait for an answer. */ |
| 929 | if (!nowait) |
| 930 | { |
| 931 | if (!eval) |
| 932 | { |
| 933 | printf ("Waiting for Emacs..."); |
| 934 | needlf = 2; |
| 935 | } |
| 936 | fflush (stdout); |
| 937 | |
| 938 | /* Now, wait for an answer and print any messages. */ |
| 939 | while ((rl = recv (s, string, BUFSIZ, 0)) > 0) |
| 940 | { |
| 941 | string[rl] = '\0'; |
| 942 | if (needlf == 2) |
| 943 | printf ("\n"); |
| 944 | printf ("%s", string); |
| 945 | needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n'; |
| 946 | } |
| 947 | |
| 948 | if (needlf) |
| 949 | printf ("\n"); |
| 950 | fflush (stdout); |
| 951 | } |
| 952 | |
| 953 | CLOSE_SOCKET (s); |
| 954 | return EXIT_SUCCESS; |
| 955 | } |
| 956 | |
| 957 | #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ |
| 958 | |
| 959 | #ifndef HAVE_STRERROR |
| 960 | char * |
| 961 | strerror (errnum) |
| 962 | int errnum; |
| 963 | { |
| 964 | extern char *sys_errlist[]; |
| 965 | extern int sys_nerr; |
| 966 | |
| 967 | if (errnum >= 0 && errnum < sys_nerr) |
| 968 | return sys_errlist[errnum]; |
| 969 | return (char *) "Unknown error"; |
| 970 | } |
| 971 | |
| 972 | #endif /* ! HAVE_STRERROR */ |
| 973 | |
| 974 | /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 |
| 975 | (do not change this comment) */ |
| 976 | |
| 977 | /* emacsclient.c ends here */ |