Annotation of src/usr.bin/tmux/client.c, Revision 1.131
1.131 ! nicm 1: /* $OpenBSD: client.c,v 1.130 2019/06/28 13:35:05 deraadt Exp $ */
1.1 nicm 2:
3: /*
1.113 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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/un.h>
22: #include <sys/wait.h>
23:
24: #include <errno.h>
1.30 nicm 25: #include <event.h>
1.80 nicm 26: #include <fcntl.h>
1.99 nicm 27: #include <imsg.h>
1.85 nicm 28: #include <signal.h>
1.1 nicm 29: #include <stdlib.h>
30: #include <string.h>
31: #include <unistd.h>
32:
33: #include "tmux.h"
34:
1.114 nicm 35: static struct tmuxproc *client_proc;
36: static struct tmuxpeer *client_peer;
37: static int client_flags;
38: static struct event client_stdin;
39: static enum {
1.52 nicm 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_exitreason = CLIENT_EXIT_NONE;
1.114 nicm 49: static int client_exitval;
50: static enum msgtype client_exittype;
51: static const char *client_exitsession;
1.115 nicm 52: static const char *client_execshell;
53: static const char *client_execcmd;
1.114 nicm 54: static int client_attached;
55:
56: static __dead void client_exec(const char *,const char *);
57: static int client_get_lock(char *);
58: static int client_connect(struct event_base *, const char *, int);
59: static void client_send_identify(const char *, const char *);
60: static void client_stdin_callback(int, short, void *);
61: static void client_write(int, const char *, size_t);
62: static void client_signal(int);
63: static void client_dispatch(struct imsg *, void *);
64: static void client_dispatch_attached(struct imsg *);
1.121 nicm 65: static void client_dispatch_wait(struct imsg *);
1.114 nicm 66: static const char *client_exit_message(void);
1.25 nicm 67:
1.49 nicm 68: /*
69: * Get server create lock. If already held then server start is happening in
1.110 nicm 70: * another client, so block until the lock is released and return -2 to
71: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 72: */
1.114 nicm 73: static int
1.49 nicm 74: client_get_lock(char *lockfile)
75: {
76: int lockfd;
77:
1.110 nicm 78: log_debug("lock file is %s", lockfile);
79:
1.109 nicm 80: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 81: log_debug("open failed: %s", strerror(errno));
82: return (-1);
1.109 nicm 83: }
1.49 nicm 84:
1.82 nicm 85: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
86: log_debug("flock failed: %s", strerror(errno));
87: if (errno != EAGAIN)
88: return (lockfd);
89: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 90: /* nothing */;
91: close(lockfd);
1.110 nicm 92: return (-2);
1.49 nicm 93: }
1.82 nicm 94: log_debug("flock succeeded");
1.49 nicm 95:
96: return (lockfd);
97: }
98:
1.46 nicm 99: /* Connect client to server. */
1.114 nicm 100: static int
1.108 nicm 101: client_connect(struct event_base *base, const char *path, int start_server)
1.1 nicm 102: {
1.26 nicm 103: struct sockaddr_un sa;
104: size_t size;
1.82 nicm 105: int fd, lockfd = -1, locked = 0;
106: char *lockfile = NULL;
1.1 nicm 107:
108: memset(&sa, 0, sizeof sa);
109: sa.sun_family = AF_UNIX;
110: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
111: if (size >= sizeof sa.sun_path) {
112: errno = ENAMETOOLONG;
1.46 nicm 113: return (-1);
1.1 nicm 114: }
1.82 nicm 115: log_debug("socket is %s", path);
1.1 nicm 116:
1.49 nicm 117: retry:
1.10 nicm 118: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 119: return (-1);
1.1 nicm 120:
1.82 nicm 121: log_debug("trying connect");
1.109 nicm 122: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 123: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 124: if (errno != ECONNREFUSED && errno != ENOENT)
125: goto failed;
1.46 nicm 126: if (!start_server)
127: goto failed;
1.49 nicm 128: close(fd);
129:
1.82 nicm 130: if (!locked) {
131: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 132: if ((lockfd = client_get_lock(lockfile)) < 0) {
133: log_debug("didn't get lock (%d)", lockfd);
134:
1.82 nicm 135: free(lockfile);
1.110 nicm 136: lockfile = NULL;
137:
138: if (lockfd == -2)
139: goto retry;
1.82 nicm 140: }
1.110 nicm 141: log_debug("got lock (%d)", lockfd);
1.82 nicm 142:
143: /*
144: * Always retry at least once, even if we got the lock,
145: * because another client could have taken the lock,
146: * started the server and released the lock between our
147: * connect() and flock().
148: */
149: locked = 1;
1.49 nicm 150: goto retry;
1.78 nicm 151: }
1.82 nicm 152:
1.110 nicm 153: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 154: free(lockfile);
155: close(lockfd);
1.49 nicm 156: return (-1);
1.78 nicm 157: }
1.122 nicm 158: fd = server_start(client_proc, base, lockfd, lockfile);
1.82 nicm 159: }
1.95 nicm 160:
1.110 nicm 161: if (locked && lockfd >= 0) {
1.58 nicm 162: free(lockfile);
1.49 nicm 163: close(lockfd);
1.1 nicm 164: }
1.47 nicm 165: setblocking(fd, 0);
1.46 nicm 166: return (fd);
167:
168: failed:
1.95 nicm 169: if (locked) {
170: free(lockfile);
171: close(lockfd);
172: }
1.46 nicm 173: close(fd);
174: return (-1);
175: }
176:
1.52 nicm 177: /* Get exit string from reason number. */
178: const char *
179: client_exit_message(void)
180: {
1.73 nicm 181: static char msg[256];
182:
1.52 nicm 183: switch (client_exitreason) {
184: case CLIENT_EXIT_NONE:
185: break;
186: case CLIENT_EXIT_DETACHED:
1.73 nicm 187: if (client_exitsession != NULL) {
188: xsnprintf(msg, sizeof msg, "detached "
189: "(from session %s)", client_exitsession);
190: return (msg);
191: }
1.52 nicm 192: return ("detached");
193: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 194: if (client_exitsession != NULL) {
195: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
196: "(from session %s)", client_exitsession);
197: return (msg);
198: }
1.52 nicm 199: return ("detached and SIGHUP");
200: case CLIENT_EXIT_LOST_TTY:
201: return ("lost tty");
202: case CLIENT_EXIT_TERMINATED:
203: return ("terminated");
204: case CLIENT_EXIT_LOST_SERVER:
1.131 ! nicm 205: return ("server exited unexpectedly");
1.52 nicm 206: case CLIENT_EXIT_EXITED:
207: return ("exited");
208: case CLIENT_EXIT_SERVER_EXITED:
209: return ("server exited");
210: }
211: return ("unknown reason");
212: }
213:
1.46 nicm 214: /* Client main loop. */
215: int
1.121 nicm 216: client_main(struct event_base *base, int argc, char **argv, int flags)
1.46 nicm 217: {
1.129 nicm 218: struct cmd_parse_result *pr;
1.46 nicm 219: struct cmd *cmd;
1.70 nicm 220: struct msg_command_data *data;
1.98 nicm 221: int cmdflags, fd, i;
222: const char *ttynam, *cwd;
1.48 nicm 223: pid_t ppid;
1.46 nicm 224: enum msgtype msg;
1.56 nicm 225: struct termios tio, saved_tio;
1.70 nicm 226: size_t size;
1.46 nicm 227:
1.99 nicm 228: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
229: signal(SIGCHLD, SIG_IGN);
230:
1.93 nicm 231: /* Save the flags. */
232: client_flags = flags;
233:
1.46 nicm 234: /* Set up the initial command. */
235: cmdflags = 0;
1.121 nicm 236: if (shell_command != NULL) {
1.46 nicm 237: msg = MSG_SHELL;
238: cmdflags = CMD_STARTSERVER;
239: } else if (argc == 0) {
240: msg = MSG_COMMAND;
1.89 nicm 241: cmdflags = CMD_STARTSERVER;
1.46 nicm 242: } else {
243: msg = MSG_COMMAND;
244:
245: /*
246: * It sucks parsing the command string twice (in client and
247: * later in server) but it is necessary to get the start server
248: * flag.
249: */
1.129 nicm 250: pr = cmd_parse_from_arguments(argc, argv, NULL);
251: if (pr->status == CMD_PARSE_SUCCESS) {
252: TAILQ_FOREACH(cmd, &pr->cmdlist->list, qentry) {
1.120 nicm 253: if (cmd->entry->flags & CMD_STARTSERVER)
254: cmdflags |= CMD_STARTSERVER;
255: }
1.129 nicm 256: cmd_list_free(pr->cmdlist);
257: } else
258: free(pr->error);
1.46 nicm 259: }
260:
1.109 nicm 261: /* Create client process structure (starts logging). */
1.122 nicm 262: client_proc = proc_start("client");
263: proc_set_signals(client_proc, client_signal);
1.109 nicm 264:
1.82 nicm 265: /* Initialize the client socket and start the server. */
1.92 nicm 266: fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
1.46 nicm 267: if (fd == -1) {
1.87 nicm 268: if (errno == ECONNREFUSED) {
269: fprintf(stderr, "no server running on %s\n",
270: socket_path);
271: } else {
272: fprintf(stderr, "error connecting to %s (%s)\n",
273: socket_path, strerror(errno));
274: }
1.46 nicm 275: return (1);
276: }
1.121 nicm 277: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 278:
1.97 nicm 279: /* Save these before pledge(). */
1.128 nicm 280: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 281: cwd = "/";
1.97 nicm 282: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
283: ttynam = "";
284:
285: /*
286: * Drop privileges for client. "proc exec" is needed for -c and for
287: * locking (which uses system(3)).
288: *
289: * "tty" is needed to restore termios(4) and also for some reason -CC
290: * does not work properly without it (input is not recognised).
291: *
292: * "sendfd" is dropped later in client_dispatch_wait().
293: */
1.105 nicm 294: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
1.97 nicm 295: fatal("pledge failed");
296:
297: /* Free stuff that is not used in the client. */
1.119 nicm 298: if (ptm_fd != -1)
299: close(ptm_fd);
1.100 nicm 300: options_free(global_options);
301: options_free(global_s_options);
302: options_free(global_w_options);
1.101 nicm 303: environ_free(global_environ);
1.46 nicm 304:
1.54 nicm 305: /* Create stdin handler. */
306: setblocking(STDIN_FILENO, 0);
307: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
308: client_stdin_callback, NULL);
1.93 nicm 309: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 310: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
311: fprintf(stderr, "tcgetattr failed: %s\n",
312: strerror(errno));
313: return (1);
314: }
1.56 nicm 315: cfmakeraw(&tio);
316: tio.c_iflag = ICRNL|IXANY;
317: tio.c_oflag = OPOST|ONLCR;
318: tio.c_lflag = NOKERNINFO;
319: tio.c_cflag = CREAD|CS8|HUPCL;
320: tio.c_cc[VMIN] = 1;
321: tio.c_cc[VTIME] = 0;
322: cfsetispeed(&tio, cfgetispeed(&saved_tio));
323: cfsetospeed(&tio, cfgetospeed(&saved_tio));
324: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
325: }
1.1 nicm 326:
1.71 nicm 327: /* Send identify messages. */
1.98 nicm 328: client_send_identify(ttynam, cwd);
1.1 nicm 329:
1.46 nicm 330: /* Send first command. */
331: if (msg == MSG_COMMAND) {
1.70 nicm 332: /* How big is the command? */
333: size = 0;
334: for (i = 0; i < argc; i++)
335: size += strlen(argv[i]) + 1;
1.124 nicm 336: if (size > MAX_IMSGSIZE - (sizeof *data)) {
337: fprintf(stderr, "command too long\n");
338: return (1);
339: }
1.70 nicm 340: data = xmalloc((sizeof *data) + size);
1.46 nicm 341:
342: /* Prepare command for server. */
1.70 nicm 343: data->argc = argc;
1.83 nicm 344: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 345: fprintf(stderr, "command too long\n");
1.70 nicm 346: free(data);
1.46 nicm 347: return (1);
348: }
1.70 nicm 349: size += sizeof *data;
1.46 nicm 350:
1.70 nicm 351: /* Send the command. */
1.99 nicm 352: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 353: fprintf(stderr, "failed to send command\n");
354: free(data);
355: return (1);
356: }
357: free(data);
1.46 nicm 358: } else if (msg == MSG_SHELL)
1.99 nicm 359: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 360:
1.99 nicm 361: /* Start main loop. */
362: proc_loop(client_proc, NULL);
1.46 nicm 363:
1.115 nicm 364: /* Run command if user requested exec, instead of exiting. */
365: if (client_exittype == MSG_EXEC) {
366: if (client_flags & CLIENT_CONTROLCONTROL)
367: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
368: client_exec(client_execshell, client_execcmd);
369: }
370:
1.46 nicm 371: /* Print the exit message, if any, and exit. */
1.48 nicm 372: if (client_attached) {
1.93 nicm 373: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 374: printf("[%s]\n", client_exit_message());
1.48 nicm 375:
376: ppid = getppid();
377: if (client_exittype == MSG_DETACHKILL && ppid > 1)
378: kill(ppid, SIGHUP);
1.93 nicm 379: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 380: if (client_exitreason != CLIENT_EXIT_NONE)
381: printf("%%exit %s\n", client_exit_message());
382: else
383: printf("%%exit\n");
384: printf("\033\\");
1.56 nicm 385: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 386: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 387: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 388: setblocking(STDIN_FILENO, 1);
1.46 nicm 389: return (client_exitval);
1.1 nicm 390: }
391:
1.71 nicm 392: /* Send identify messages to server. */
1.114 nicm 393: static void
1.98 nicm 394: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 395: {
1.90 nicm 396: const char *s;
1.71 nicm 397: char **ss;
1.91 nicm 398: size_t sslen;
1.93 nicm 399: int fd, flags = client_flags;
1.90 nicm 400: pid_t pid;
1.71 nicm 401:
1.99 nicm 402: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 403:
404: if ((s = getenv("TERM")) == NULL)
405: s = "";
1.99 nicm 406: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 407:
1.107 nicm 408: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
409: strlen(ttynam) + 1);
1.99 nicm 410: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 411:
1.50 nicm 412: if ((fd = dup(STDIN_FILENO)) == -1)
413: fatal("dup failed");
1.99 nicm 414: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 415:
416: pid = getpid();
1.99 nicm 417: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 418:
1.91 nicm 419: for (ss = environ; *ss != NULL; ss++) {
420: sslen = strlen(*ss) + 1;
1.107 nicm 421: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
422: continue;
423: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 424: }
1.75 nicm 425:
1.99 nicm 426: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 427: }
428:
1.54 nicm 429: /* Callback for client stdin read events. */
1.114 nicm 430: static void
1.106 nicm 431: client_stdin_callback(__unused int fd, __unused short events,
432: __unused void *arg)
1.54 nicm 433: {
434: struct msg_stdin_data data;
435:
436: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
1.130 deraadt 437: if (data.size == -1 && (errno == EINTR || errno == EAGAIN))
1.54 nicm 438: return;
439:
1.99 nicm 440: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 441: if (data.size <= 0)
442: event_del(&client_stdin);
443: }
444:
1.57 nicm 445: /* Force write to file descriptor. */
1.114 nicm 446: static void
1.57 nicm 447: client_write(int fd, const char *data, size_t size)
448: {
449: ssize_t used;
450:
1.125 nicm 451: log_debug("%s: %.*s", __func__, (int)size, data);
1.57 nicm 452: while (size != 0) {
453: used = write(fd, data, size);
454: if (used == -1) {
455: if (errno == EINTR || errno == EAGAIN)
456: continue;
457: break;
458: }
459: data += used;
460: size -= used;
461: }
462: }
463:
1.93 nicm 464: /* Run command in shell; used for -c. */
1.114 nicm 465: static __dead void
1.111 nicm 466: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 467: {
468: const char *name, *ptr;
469: char *argv0;
470:
1.111 nicm 471: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 472:
473: ptr = strrchr(shell, '/');
474: if (ptr != NULL && *(ptr + 1) != '\0')
475: name = ptr + 1;
476: else
477: name = shell;
478: if (client_flags & CLIENT_LOGIN)
479: xasprintf(&argv0, "-%s", name);
480: else
481: xasprintf(&argv0, "%s", name);
482: setenv("SHELL", shell, 1);
483:
1.123 nicm 484: proc_clear_signals(client_proc, 1);
485:
1.93 nicm 486: setblocking(STDIN_FILENO, 1);
487: setblocking(STDOUT_FILENO, 1);
488: setblocking(STDERR_FILENO, 1);
489: closefrom(STDERR_FILENO + 1);
490:
1.111 nicm 491: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 492: fatal("execl failed");
493: }
494:
1.99 nicm 495: /* Callback to handle signals in the client. */
1.114 nicm 496: static void
1.99 nicm 497: client_signal(int sig)
498: {
499: struct sigaction sigact;
500: int status;
501:
502: if (sig == SIGCHLD)
503: waitpid(WAIT_ANY, &status, WNOHANG);
504: else if (!client_attached) {
505: if (sig == SIGTERM)
506: proc_exit(client_proc);
507: } else {
508: switch (sig) {
509: case SIGHUP:
510: client_exitreason = CLIENT_EXIT_LOST_TTY;
511: client_exitval = 1;
512: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
513: break;
514: case SIGTERM:
515: client_exitreason = CLIENT_EXIT_TERMINATED;
516: client_exitval = 1;
517: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
518: break;
519: case SIGWINCH:
520: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
521: break;
522: case SIGCONT:
523: memset(&sigact, 0, sizeof sigact);
524: sigemptyset(&sigact.sa_mask);
525: sigact.sa_flags = SA_RESTART;
526: sigact.sa_handler = SIG_IGN;
527: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
528: fatal("sigaction failed");
529: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
530: break;
531: }
532: }
533: }
534:
535: /* Callback for client read events. */
1.114 nicm 536: static void
1.121 nicm 537: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 538: {
539: if (imsg == NULL) {
540: client_exitreason = CLIENT_EXIT_LOST_SERVER;
541: client_exitval = 1;
1.109 nicm 542: proc_exit(client_proc);
543: return;
544: }
545:
546: if (client_attached)
1.99 nicm 547: client_dispatch_attached(imsg);
548: else
1.121 nicm 549: client_dispatch_wait(imsg);
1.99 nicm 550: }
551:
1.46 nicm 552: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 553: static void
1.121 nicm 554: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 555: {
1.69 nicm 556: char *data;
1.99 nicm 557: ssize_t datalen;
1.69 nicm 558: struct msg_stdout_data stdoutdata;
559: struct msg_stderr_data stderrdata;
560: int retval;
1.97 nicm 561: static int pledge_applied;
562:
563: /*
564: * "sendfd" is no longer required once all of the identify messages
565: * have been sent. We know the server won't send us anything until that
566: * point (because we don't ask it to), so we can drop "sendfd" once we
567: * get the first message from the server.
568: */
569: if (!pledge_applied) {
1.105 nicm 570: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 571: fatal("pledge failed");
572: pledge_applied = 1;
573: };
1.46 nicm 574:
1.99 nicm 575: data = imsg->data;
576: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 577:
1.99 nicm 578: switch (imsg->hdr.type) {
579: case MSG_EXIT:
580: case MSG_SHUTDOWN:
581: if (datalen != sizeof retval && datalen != 0)
582: fatalx("bad MSG_EXIT size");
583: if (datalen == sizeof retval) {
584: memcpy(&retval, data, sizeof retval);
585: client_exitval = retval;
586: }
587: proc_exit(client_proc);
588: break;
589: case MSG_READY:
590: if (datalen != 0)
591: fatalx("bad MSG_READY size");
1.54 nicm 592:
1.99 nicm 593: event_del(&client_stdin);
594: client_attached = 1;
595: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
596: break;
597: case MSG_STDIN:
598: if (datalen != 0)
599: fatalx("bad MSG_STDIN size");
1.54 nicm 600:
1.99 nicm 601: event_add(&client_stdin, NULL);
602: break;
603: case MSG_STDOUT:
604: if (datalen != sizeof stdoutdata)
605: fatalx("bad MSG_STDOUT size");
606: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 607:
1.99 nicm 608: client_write(STDOUT_FILENO, stdoutdata.data,
609: stdoutdata.size);
610: break;
611: case MSG_STDERR:
612: if (datalen != sizeof stderrdata)
613: fatalx("bad MSG_STDERR size");
614: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 615:
1.99 nicm 616: client_write(STDERR_FILENO, stderrdata.data,
617: stderrdata.size);
618: break;
619: case MSG_VERSION:
620: if (datalen != 0)
621: fatalx("bad MSG_VERSION size");
622:
623: fprintf(stderr, "protocol version mismatch "
624: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 625: imsg->hdr.peerid & 0xff);
1.99 nicm 626: client_exitval = 1;
627: proc_exit(client_proc);
628: break;
629: case MSG_SHELL:
630: if (datalen == 0 || data[datalen - 1] != '\0')
631: fatalx("bad MSG_SHELL string");
632:
1.121 nicm 633: client_exec(data, shell_command);
1.99 nicm 634: /* NOTREACHED */
635: case MSG_DETACH:
636: case MSG_DETACHKILL:
637: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
638: break;
639: case MSG_EXITED:
640: proc_exit(client_proc);
641: break;
1.46 nicm 642: }
643: }
644:
645: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 646: static void
1.99 nicm 647: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 648: {
1.69 nicm 649: struct sigaction sigact;
650: char *data;
1.99 nicm 651: ssize_t datalen;
1.9 nicm 652:
1.99 nicm 653: data = imsg->data;
654: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 655:
1.99 nicm 656: switch (imsg->hdr.type) {
657: case MSG_DETACH:
658: case MSG_DETACHKILL:
659: if (datalen == 0 || data[datalen - 1] != '\0')
660: fatalx("bad MSG_DETACH string");
661:
662: client_exitsession = xstrdup(data);
663: client_exittype = imsg->hdr.type;
664: if (imsg->hdr.type == MSG_DETACHKILL)
665: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
666: else
667: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 668: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
669: break;
670: case MSG_EXEC:
671: if (datalen == 0 || data[datalen - 1] != '\0' ||
672: strlen(data) + 1 == (size_t)datalen)
673: fatalx("bad MSG_EXEC string");
674: client_execcmd = xstrdup(data);
675: client_execshell = xstrdup(data + strlen(data) + 1);
676:
677: client_exittype = imsg->hdr.type;
1.99 nicm 678: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
679: break;
680: case MSG_EXIT:
681: if (datalen != 0 && datalen != sizeof (int))
682: fatalx("bad MSG_EXIT size");
1.9 nicm 683:
1.99 nicm 684: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
685: client_exitreason = CLIENT_EXIT_EXITED;
686: break;
687: case MSG_EXITED:
688: if (datalen != 0)
689: fatalx("bad MSG_EXITED size");
1.9 nicm 690:
1.99 nicm 691: proc_exit(client_proc);
692: break;
693: case MSG_SHUTDOWN:
694: if (datalen != 0)
695: fatalx("bad MSG_SHUTDOWN size");
696:
697: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
698: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
699: client_exitval = 1;
700: break;
701: case MSG_SUSPEND:
702: if (datalen != 0)
703: fatalx("bad MSG_SUSPEND size");
704:
705: memset(&sigact, 0, sizeof sigact);
706: sigemptyset(&sigact.sa_mask);
707: sigact.sa_flags = SA_RESTART;
708: sigact.sa_handler = SIG_DFL;
709: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
710: fatal("sigaction failed");
711: kill(getpid(), SIGTSTP);
712: break;
713: case MSG_LOCK:
714: if (datalen == 0 || data[datalen - 1] != '\0')
715: fatalx("bad MSG_LOCK string");
1.9 nicm 716:
1.99 nicm 717: system(data);
718: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
719: break;
1.9 nicm 720: }
1.1 nicm 721: }
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