1 /* $OpenBSD$ */ 2 3 /* 4 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott (at) gmail.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/socket.h> 21 #include <sys/uio.h> 22 #include <sys/un.h> 23 #include <sys/wait.h> 24 #include <sys/file.h> 25 26 #include <errno.h> 27 #include <fcntl.h> 28 #include <signal.h> 29 #include <stdlib.h> 30 #include <string.h> 31 #include <unistd.h> 32 33 #include "tmux.h" 34 35 static struct tmuxproc *client_proc; 36 static struct tmuxpeer *client_peer; 37 static uint64_t client_flags; 38 static int client_suspended; 39 static enum { 40 CLIENT_EXIT_NONE, 41 CLIENT_EXIT_DETACHED, 42 CLIENT_EXIT_DETACHED_HUP, 43 CLIENT_EXIT_LOST_TTY, 44 CLIENT_EXIT_TERMINATED, 45 CLIENT_EXIT_LOST_SERVER, 46 CLIENT_EXIT_EXITED, 47 CLIENT_EXIT_SERVER_EXITED, 48 CLIENT_EXIT_MESSAGE_PROVIDED 49 } client_exitreason = CLIENT_EXIT_NONE; 50 static int client_exitflag; 51 static int client_exitval; 52 static enum msgtype client_exittype; 53 static const char *client_exitsession; 54 static char *client_exitmessage; 55 static const char *client_execshell; 56 static const char *client_execcmd; 57 static int client_attached; 58 static struct client_files client_files = RB_INITIALIZER(&client_files); 59 60 static __dead void client_exec(const char *,const char *); 61 static int client_get_lock(char *); 62 static int client_connect(struct event_base *, const char *, 63 uint64_t); 64 static void client_send_identify(const char *, const char *, 65 char **, u_int, const char *, int); 66 static void client_signal(int); 67 static void client_dispatch(struct imsg *, void *); 68 static void client_dispatch_attached(struct imsg *); 69 static void client_dispatch_wait(struct imsg *); 70 static const char *client_exit_message(void); 71 72 /* 73 * Get server create lock. If already held then server start is happening in 74 * another client, so block until the lock is released and return -2 to 75 * retry. Return -1 on failure to continue and start the server anyway. 76 */ 77 static int 78 client_get_lock(char *lockfile) 79 { 80 int lockfd; 81 82 log_debug("lock file is %s", lockfile); 83 84 if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) { 85 log_debug("open failed: %s", strerror(errno)); 86 return (-1); 87 } 88 89 if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) { 90 log_debug("flock failed: %s", strerror(errno)); 91 if (errno != EAGAIN) 92 return (lockfd); 93 while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR) 94 /* nothing */; 95 close(lockfd); 96 return (-2); 97 } 98 log_debug("flock succeeded"); 99 100 return (lockfd); 101 } 102 103 /* Connect client to server. */ 104 static int 105 client_connect(struct event_base *base, const char *path, uint64_t flags) 106 { 107 struct sockaddr_un sa; 108 size_t size; 109 int fd, lockfd = -1, locked = 0; 110 char *lockfile = NULL; 111 112 memset(&sa, 0, sizeof sa); 113 sa.sun_family = AF_UNIX; 114 size = strlcpy(sa.sun_path, path, sizeof sa.sun_path); 115 if (size >= sizeof sa.sun_path) { 116 errno = ENAMETOOLONG; 117 return (-1); 118 } 119 log_debug("socket is %s", path); 120 121 retry: 122 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 123 return (-1); 124 125 log_debug("trying connect"); 126 if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) { 127 log_debug("connect failed: %s", strerror(errno)); 128 if (errno != ECONNREFUSED && errno != ENOENT) 129 goto failed; 130 if (flags & CLIENT_NOSTARTSERVER) 131 goto failed; 132 if (~flags & CLIENT_STARTSERVER) 133 goto failed; 134 close(fd); 135 136 if (!locked) { 137 xasprintf(&lockfile, "%s.lock", path); 138 if ((lockfd = client_get_lock(lockfile)) < 0) { 139 log_debug("didn't get lock (%d)", lockfd); 140 141 free(lockfile); 142 lockfile = NULL; 143 144 if (lockfd == -2) 145 goto retry; 146 } 147 log_debug("got lock (%d)", lockfd); 148 149 /* 150 * Always retry at least once, even if we got the lock, 151 * because another client could have taken the lock, 152 * started the server and released the lock between our 153 * connect() and flock(). 154 */ 155 locked = 1; 156 goto retry; 157 } 158 159 if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) { 160 free(lockfile); 161 close(lockfd); 162 return (-1); 163 } 164 fd = server_start(client_proc, flags, base, lockfd, lockfile); 165 } 166 167 if (locked && lockfd >= 0) { 168 free(lockfile); 169 close(lockfd); 170 } 171 setblocking(fd, 0); 172 return (fd); 173 174 failed: 175 if (locked) { 176 free(lockfile); 177 close(lockfd); 178 } 179 close(fd); 180 return (-1); 181 } 182 183 /* Get exit string from reason number. */ 184 const char * 185 client_exit_message(void) 186 { 187 static char msg[256]; 188 189 switch (client_exitreason) { 190 case CLIENT_EXIT_NONE: 191 break; 192 case CLIENT_EXIT_DETACHED: 193 if (client_exitsession != NULL) { 194 xsnprintf(msg, sizeof msg, "detached " 195 "(from session %s)", client_exitsession); 196 return (msg); 197 } 198 return ("detached"); 199 case CLIENT_EXIT_DETACHED_HUP: 200 if (client_exitsession != NULL) { 201 xsnprintf(msg, sizeof msg, "detached and SIGHUP " 202 "(from session %s)", client_exitsession); 203 return (msg); 204 } 205 return ("detached and SIGHUP"); 206 case CLIENT_EXIT_LOST_TTY: 207 return ("lost tty"); 208 case CLIENT_EXIT_TERMINATED: 209 return ("terminated"); 210 case CLIENT_EXIT_LOST_SERVER: 211 return ("server exited unexpectedly"); 212 case CLIENT_EXIT_EXITED: 213 return ("exited"); 214 case CLIENT_EXIT_SERVER_EXITED: 215 return ("server exited"); 216 case CLIENT_EXIT_MESSAGE_PROVIDED: 217 return (client_exitmessage); 218 } 219 return ("unknown reason"); 220 } 221 222 /* Exit if all streams flushed. */ 223 static void 224 client_exit(void) 225 { 226 if (!file_write_left(&client_files)) 227 proc_exit(client_proc); 228 } 229 230 /* Client main loop. */ 231 int 232 client_main(struct event_base *base, int argc, char **argv, uint64_t flags, 233 int feat) 234 { 235 struct cmd_parse_result *pr; 236 struct msg_command *data; 237 int fd, i; 238 const char *ttynam, *termname, *cwd; 239 pid_t ppid; 240 enum msgtype msg; 241 struct termios tio, saved_tio; 242 size_t size, linesize = 0; 243 ssize_t linelen; 244 char *line = NULL, **caps = NULL, *cause; 245 u_int ncaps = 0; 246 struct args_value *values; 247 248 /* Set up the initial command. */ 249 if (shell_command != NULL) { 250 msg = MSG_SHELL; 251 flags |= CLIENT_STARTSERVER; 252 } else if (argc == 0) { 253 msg = MSG_COMMAND; 254 flags |= CLIENT_STARTSERVER; 255 } else { 256 msg = MSG_COMMAND; 257 258 /* 259 * It's annoying parsing the command string twice (in client 260 * and later in server) but it is necessary to get the start 261 * server flag. 262 */ 263 values = args_from_vector(argc, argv); 264 pr = cmd_parse_from_arguments(values, argc, NULL); 265 if (pr->status == CMD_PARSE_SUCCESS) { 266 if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER)) 267 flags |= CLIENT_STARTSERVER; 268 cmd_list_free(pr->cmdlist); 269 } else 270 free(pr->error); 271 args_free_values(values, argc); 272 free(values); 273 } 274 275 /* Create client process structure (starts logging). */ 276 client_proc = proc_start("client"); 277 proc_set_signals(client_proc, client_signal); 278 279 /* Save the flags. */ 280 client_flags = flags; 281 log_debug("flags are %#llx", (unsigned long long)client_flags); 282 283 /* Initialize the client socket and start the server. */ 284 #ifdef HAVE_SYSTEMD 285 if (systemd_activated()) { 286 /* socket-based activation, do not even try to be a client. */ 287 fd = server_start(client_proc, flags, base, 0, NULL); 288 } else 289 #endif 290 fd = client_connect(base, socket_path, client_flags); 291 if (fd == -1) { 292 if (errno == ECONNREFUSED) { 293 fprintf(stderr, "no server running on %s\n", 294 socket_path); 295 } else { 296 fprintf(stderr, "error connecting to %s (%s)\n", 297 socket_path, strerror(errno)); 298 } 299 return (1); 300 } 301 client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL); 302 303 /* Save these before pledge(). */ 304 if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL) 305 cwd = "/"; 306 if ((ttynam = ttyname(STDIN_FILENO)) == NULL) 307 ttynam = ""; 308 if ((termname = getenv("TERM")) == NULL) 309 termname = ""; 310 311 /* 312 * Drop privileges for client. "proc exec" is needed for -c and for 313 * locking (which uses system(3)). 314 * 315 * "tty" is needed to restore termios(4) and also for some reason -CC 316 * does not work properly without it (input is not recognised). 317 * 318 * "sendfd" is dropped later in client_dispatch_wait(). 319 */ 320 if (pledge( 321 "stdio rpath wpath cpath unix sendfd proc exec tty", 322 NULL) != 0) 323 fatal("pledge failed"); 324 325 /* Load terminfo entry if any. */ 326 if (isatty(STDIN_FILENO) && 327 *termname != '\0' && 328 tty_term_read_list(termname, STDIN_FILENO, &caps, &ncaps, 329 &cause) != 0) { 330 fprintf(stderr, "%s\n", cause); 331 free(cause); 332 return (1); 333 } 334 335 /* Free stuff that is not used in the client. */ 336 if (ptm_fd != -1) 337 close(ptm_fd); 338 options_free(global_options); 339 options_free(global_s_options); 340 options_free(global_w_options); 341 environ_free(global_environ); 342 343 /* Set up control mode. */ 344 if (client_flags & CLIENT_CONTROLCONTROL) { 345 if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) { 346 fprintf(stderr, "tcgetattr failed: %s\n", 347 strerror(errno)); 348 return (1); 349 } 350 cfmakeraw(&tio); 351 tio.c_iflag = ICRNL|IXANY; 352 tio.c_oflag = OPOST|ONLCR; 353 #ifdef NOKERNINFO 354 tio.c_lflag = NOKERNINFO; 355 #endif 356 tio.c_cflag = CREAD|CS8|HUPCL; 357 tio.c_cc[VMIN] = 1; 358 tio.c_cc[VTIME] = 0; 359 cfsetispeed(&tio, cfgetispeed(&saved_tio)); 360 cfsetospeed(&tio, cfgetospeed(&saved_tio)); 361 tcsetattr(STDIN_FILENO, TCSANOW, &tio); 362 } 363 364 /* Send identify messages. */ 365 client_send_identify(ttynam, termname, caps, ncaps, cwd, feat); 366 tty_term_free_list(caps, ncaps); 367 proc_flush_peer(client_peer); 368 369 /* Send first command. */ 370 if (msg == MSG_COMMAND) { 371 /* How big is the command? */ 372 size = 0; 373 for (i = 0; i < argc; i++) 374 size += strlen(argv[i]) + 1; 375 if (size > MAX_IMSGSIZE - (sizeof *data)) { 376 fprintf(stderr, "command too long\n"); 377 return (1); 378 } 379 data = xmalloc((sizeof *data) + size); 380 381 /* Prepare command for server. */ 382 data->argc = argc; 383 if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) { 384 fprintf(stderr, "command too long\n"); 385 free(data); 386 return (1); 387 } 388 size += sizeof *data; 389 390 /* Send the command. */ 391 if (proc_send(client_peer, msg, -1, data, size) != 0) { 392 fprintf(stderr, "failed to send command\n"); 393 free(data); 394 return (1); 395 } 396 free(data); 397 } else if (msg == MSG_SHELL) 398 proc_send(client_peer, msg, -1, NULL, 0); 399 400 /* Start main loop. */ 401 proc_loop(client_proc, NULL); 402 403 /* Run command if user requested exec, instead of exiting. */ 404 if (client_exittype == MSG_EXEC) { 405 if (client_flags & CLIENT_CONTROLCONTROL) 406 tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio); 407 client_exec(client_execshell, client_execcmd); 408 } 409 410 /* Restore streams to blocking. */ 411 setblocking(STDIN_FILENO, 1); 412 setblocking(STDOUT_FILENO, 1); 413 setblocking(STDERR_FILENO, 1); 414 415 /* Print the exit message, if any, and exit. */ 416 if (client_attached) { 417 if (client_exitreason != CLIENT_EXIT_NONE) 418 printf("[%s]\n", client_exit_message()); 419 420 ppid = getppid(); 421 if (client_exittype == MSG_DETACHKILL && ppid > 1) 422 kill(ppid, SIGHUP); 423 } else if (client_flags & CLIENT_CONTROL) { 424 if (client_exitreason != CLIENT_EXIT_NONE) 425 printf("%%exit %s\n", client_exit_message()); 426 else 427 printf("%%exit\n"); 428 fflush(stdout); 429 if (client_flags & CLIENT_CONTROL_WAITEXIT) { 430 setvbuf(stdin, NULL, _IOLBF, 0); 431 for (;;) { 432 linelen = getline(&line, &linesize, stdin); 433 if (linelen <= 1) 434 break; 435 } 436 free(line); 437 } 438 if (client_flags & CLIENT_CONTROLCONTROL) { 439 printf("\033\\"); 440 fflush(stdout); 441 tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio); 442 } 443 } else if (client_exitreason != CLIENT_EXIT_NONE) 444 fprintf(stderr, "%s\n", client_exit_message()); 445 return (client_exitval); 446 } 447 448 /* Send identify messages to server. */ 449 static void 450 client_send_identify(const char *ttynam, const char *termname, char **caps, 451 u_int ncaps, const char *cwd, int feat) 452 { 453 char **ss; 454 size_t sslen; 455 int fd; 456 uint64_t flags = client_flags; 457 pid_t pid; 458 u_int i; 459 460 proc_send(client_peer, MSG_IDENTIFY_LONGFLAGS, -1, &flags, sizeof flags); 461 proc_send(client_peer, MSG_IDENTIFY_LONGFLAGS, -1, &client_flags, 462 sizeof client_flags); 463 464 proc_send(client_peer, MSG_IDENTIFY_TERM, -1, termname, 465 strlen(termname) + 1); 466 proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat); 467 468 proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam, 469 strlen(ttynam) + 1); 470 proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1); 471 472 for (i = 0; i < ncaps; i++) { 473 proc_send(client_peer, MSG_IDENTIFY_TERMINFO, -1, 474 caps[i], strlen(caps[i]) + 1); 475 } 476 477 if ((fd = dup(STDIN_FILENO)) == -1) 478 fatal("dup failed"); 479 proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0); 480 if ((fd = dup(STDOUT_FILENO)) == -1) 481 fatal("dup failed"); 482 proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0); 483 484 pid = getpid(); 485 proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid); 486 487 for (ss = environ; *ss != NULL; ss++) { 488 sslen = strlen(*ss) + 1; 489 if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) 490 continue; 491 proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen); 492 } 493 494 proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0); 495 } 496 497 /* Run command in shell; used for -c. */ 498 static __dead void 499 client_exec(const char *shell, const char *shellcmd) 500 { 501 char *argv0; 502 503 log_debug("shell %s, command %s", shell, shellcmd); 504 argv0 = shell_argv0(shell, !!(client_flags & CLIENT_LOGIN)); 505 setenv("SHELL", shell, 1); 506 507 proc_clear_signals(client_proc, 1); 508 509 setblocking(STDIN_FILENO, 1); 510 setblocking(STDOUT_FILENO, 1); 511 setblocking(STDERR_FILENO, 1); 512 closefrom(STDERR_FILENO + 1); 513 514 execl(shell, argv0, "-c", shellcmd, (char *) NULL); 515 fatal("execl failed"); 516 } 517 518 /* Callback to handle signals in the client. */ 519 static void 520 client_signal(int sig) 521 { 522 struct sigaction sigact; 523 int status; 524 pid_t pid; 525 526 log_debug("%s: %s", __func__, strsignal(sig)); 527 if (sig == SIGCHLD) { 528 for (;;) { 529 pid = waitpid(WAIT_ANY, &status, WNOHANG); 530 if (pid == 0) 531 break; 532 if (pid == -1) { 533 if (errno == ECHILD) 534 break; 535 log_debug("waitpid failed: %s", 536 strerror(errno)); 537 } 538 } 539 } else if (!client_attached) { 540 if (sig == SIGTERM || sig == SIGHUP) 541 proc_exit(client_proc); 542 } else { 543 switch (sig) { 544 case SIGHUP: 545 client_exitreason = CLIENT_EXIT_LOST_TTY; 546 client_exitval = 1; 547 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 548 break; 549 case SIGTERM: 550 if (!client_suspended) 551 client_exitreason = CLIENT_EXIT_TERMINATED; 552 client_exitval = 1; 553 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 554 break; 555 case SIGWINCH: 556 proc_send(client_peer, MSG_RESIZE, -1, NULL, 0); 557 break; 558 case SIGCONT: 559 memset(&sigact, 0, sizeof sigact); 560 sigemptyset(&sigact.sa_mask); 561 sigact.sa_flags = SA_RESTART; 562 sigact.sa_handler = SIG_IGN; 563 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 564 fatal("sigaction failed"); 565 proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0); 566 client_suspended = 0; 567 break; 568 } 569 } 570 } 571 572 /* Callback for file write error or close. */ 573 static void 574 client_file_check_cb(__unused struct client *c, __unused const char *path, 575 __unused int error, __unused int closed, __unused struct evbuffer *buffer, 576 __unused void *data) 577 { 578 if (client_exitflag) 579 client_exit(); 580 } 581 582 /* Callback for client read events. */ 583 static void 584 client_dispatch(struct imsg *imsg, __unused void *arg) 585 { 586 if (imsg == NULL) { 587 if (!client_exitflag) { 588 client_exitreason = CLIENT_EXIT_LOST_SERVER; 589 client_exitval = 1; 590 } 591 proc_exit(client_proc); 592 return; 593 } 594 595 if (client_attached) 596 client_dispatch_attached(imsg); 597 else 598 client_dispatch_wait(imsg); 599 } 600 601 /* Process an exit message. */ 602 static void 603 client_dispatch_exit_message(char *data, size_t datalen) 604 { 605 int retval; 606 607 if (datalen < sizeof retval && datalen != 0) 608 fatalx("bad MSG_EXIT size"); 609 610 if (datalen >= sizeof retval) { 611 memcpy(&retval, data, sizeof retval); 612 client_exitval = retval; 613 } 614 615 if (datalen > sizeof retval) { 616 datalen -= sizeof retval; 617 data += sizeof retval; 618 619 client_exitmessage = xmalloc(datalen); 620 memcpy(client_exitmessage, data, datalen); 621 client_exitmessage[datalen - 1] = '\0'; 622 623 client_exitreason = CLIENT_EXIT_MESSAGE_PROVIDED; 624 } 625 } 626 627 /* Dispatch imsgs when in wait state (before MSG_READY). */ 628 static void 629 client_dispatch_wait(struct imsg *imsg) 630 { 631 char *data; 632 ssize_t datalen; 633 static int pledge_applied; 634 635 /* 636 * "sendfd" is no longer required once all of the identify messages 637 * have been sent. We know the server won't send us anything until that 638 * point (because we don't ask it to), so we can drop "sendfd" once we 639 * get the first message from the server. 640 */ 641 if (!pledge_applied) { 642 if (pledge( 643 "stdio rpath wpath cpath unix proc exec tty", 644 NULL) != 0) 645 fatal("pledge failed"); 646 pledge_applied = 1; 647 } 648 649 data = imsg->data; 650 datalen = imsg->hdr.len - IMSG_HEADER_SIZE; 651 652 switch (imsg->hdr.type) { 653 case MSG_EXIT: 654 case MSG_SHUTDOWN: 655 client_dispatch_exit_message(data, datalen); 656 client_exitflag = 1; 657 client_exit(); 658 break; 659 case MSG_READY: 660 if (datalen != 0) 661 fatalx("bad MSG_READY size"); 662 663 client_attached = 1; 664 proc_send(client_peer, MSG_RESIZE, -1, NULL, 0); 665 break; 666 case MSG_VERSION: 667 if (datalen != 0) 668 fatalx("bad MSG_VERSION size"); 669 670 fprintf(stderr, "protocol version mismatch " 671 "(client %d, server %u)\n", PROTOCOL_VERSION, 672 imsg->hdr.peerid & 0xff); 673 client_exitval = 1; 674 proc_exit(client_proc); 675 break; 676 case MSG_FLAGS: 677 if (datalen != sizeof client_flags) 678 fatalx("bad MSG_FLAGS string"); 679 680 memcpy(&client_flags, data, sizeof client_flags); 681 log_debug("new flags are %#llx", 682 (unsigned long long)client_flags); 683 break; 684 case MSG_SHELL: 685 if (datalen == 0 || data[datalen - 1] != '\0') 686 fatalx("bad MSG_SHELL string"); 687 688 client_exec(data, shell_command); 689 /* NOTREACHED */ 690 case MSG_DETACH: 691 case MSG_DETACHKILL: 692 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 693 break; 694 case MSG_EXITED: 695 proc_exit(client_proc); 696 break; 697 case MSG_READ_OPEN: 698 file_read_open(&client_files, client_peer, imsg, 1, 699 !(client_flags & CLIENT_CONTROL), client_file_check_cb, 700 NULL); 701 break; 702 case MSG_READ_CANCEL: 703 file_read_cancel(&client_files, imsg); 704 break; 705 case MSG_WRITE_OPEN: 706 file_write_open(&client_files, client_peer, imsg, 1, 707 !(client_flags & CLIENT_CONTROL), client_file_check_cb, 708 NULL); 709 break; 710 case MSG_WRITE: 711 file_write_data(&client_files, imsg); 712 break; 713 case MSG_WRITE_CLOSE: 714 file_write_close(&client_files, imsg); 715 break; 716 case MSG_OLDSTDERR: 717 case MSG_OLDSTDIN: 718 case MSG_OLDSTDOUT: 719 fprintf(stderr, "server version is too old for client\n"); 720 proc_exit(client_proc); 721 break; 722 } 723 } 724 725 /* Dispatch imsgs in attached state (after MSG_READY). */ 726 static void 727 client_dispatch_attached(struct imsg *imsg) 728 { 729 struct sigaction sigact; 730 char *data; 731 ssize_t datalen; 732 733 data = imsg->data; 734 datalen = imsg->hdr.len - IMSG_HEADER_SIZE; 735 736 switch (imsg->hdr.type) { 737 case MSG_FLAGS: 738 if (datalen != sizeof client_flags) 739 fatalx("bad MSG_FLAGS string"); 740 741 memcpy(&client_flags, data, sizeof client_flags); 742 log_debug("new flags are %#llx", 743 (unsigned long long)client_flags); 744 break; 745 case MSG_DETACH: 746 case MSG_DETACHKILL: 747 if (datalen == 0 || data[datalen - 1] != '\0') 748 fatalx("bad MSG_DETACH string"); 749 750 client_exitsession = xstrdup(data); 751 client_exittype = imsg->hdr.type; 752 if (imsg->hdr.type == MSG_DETACHKILL) 753 client_exitreason = CLIENT_EXIT_DETACHED_HUP; 754 else 755 client_exitreason = CLIENT_EXIT_DETACHED; 756 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 757 break; 758 case MSG_EXEC: 759 if (datalen == 0 || data[datalen - 1] != '\0' || 760 strlen(data) + 1 == (size_t)datalen) 761 fatalx("bad MSG_EXEC string"); 762 client_execcmd = xstrdup(data); 763 client_execshell = xstrdup(data + strlen(data) + 1); 764 765 client_exittype = imsg->hdr.type; 766 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 767 break; 768 case MSG_EXIT: 769 client_dispatch_exit_message(data, datalen); 770 if (client_exitreason == CLIENT_EXIT_NONE) 771 client_exitreason = CLIENT_EXIT_EXITED; 772 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 773 break; 774 case MSG_EXITED: 775 if (datalen != 0) 776 fatalx("bad MSG_EXITED size"); 777 778 proc_exit(client_proc); 779 break; 780 case MSG_SHUTDOWN: 781 if (datalen != 0) 782 fatalx("bad MSG_SHUTDOWN size"); 783 784 proc_send(client_peer, MSG_EXITING, -1, NULL, 0); 785 client_exitreason = CLIENT_EXIT_SERVER_EXITED; 786 client_exitval = 1; 787 break; 788 case MSG_SUSPEND: 789 if (datalen != 0) 790 fatalx("bad MSG_SUSPEND size"); 791 792 memset(&sigact, 0, sizeof sigact); 793 sigemptyset(&sigact.sa_mask); 794 sigact.sa_flags = SA_RESTART; 795 sigact.sa_handler = SIG_DFL; 796 if (sigaction(SIGTSTP, &sigact, NULL) != 0) 797 fatal("sigaction failed"); 798 client_suspended = 1; 799 kill(getpid(), SIGTSTP); 800 break; 801 case MSG_LOCK: 802 if (datalen == 0 || data[datalen - 1] != '\0') 803 fatalx("bad MSG_LOCK string"); 804 805 system(data); 806 proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0); 807 break; 808 } 809 } 810
Indexes created Tue Feb 24 08:35:24 UTC 2026