Annotation of src/usr.bin/tmux/client.c, Revision 1.125
1.125 ! nicm 1: /* $OpenBSD: client.c,v 1.124 2017/12/18 22:13:36 nicm 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>
1.51 nicm 20: #include <sys/file.h>
1.1 nicm 21: #include <sys/socket.h>
22: #include <sys/stat.h>
23: #include <sys/un.h>
24: #include <sys/wait.h>
25:
26: #include <errno.h>
1.30 nicm 27: #include <event.h>
1.80 nicm 28: #include <fcntl.h>
1.99 nicm 29: #include <imsg.h>
1.85 nicm 30: #include <signal.h>
1.1 nicm 31: #include <stdlib.h>
32: #include <string.h>
33: #include <unistd.h>
34:
35: #include "tmux.h"
36:
1.114 nicm 37: static struct tmuxproc *client_proc;
38: static struct tmuxpeer *client_peer;
39: static int client_flags;
40: static struct event client_stdin;
41: static enum {
1.52 nicm 42: CLIENT_EXIT_NONE,
43: CLIENT_EXIT_DETACHED,
44: CLIENT_EXIT_DETACHED_HUP,
45: CLIENT_EXIT_LOST_TTY,
46: CLIENT_EXIT_TERMINATED,
47: CLIENT_EXIT_LOST_SERVER,
48: CLIENT_EXIT_EXITED,
49: CLIENT_EXIT_SERVER_EXITED,
50: } client_exitreason = CLIENT_EXIT_NONE;
1.114 nicm 51: static int client_exitval;
52: static enum msgtype client_exittype;
53: static const char *client_exitsession;
1.115 nicm 54: static const char *client_execshell;
55: static const char *client_execcmd;
1.114 nicm 56: static int client_attached;
57:
58: static __dead void client_exec(const char *,const char *);
59: static int client_get_lock(char *);
60: static int client_connect(struct event_base *, const char *, int);
61: static void client_send_identify(const char *, const char *);
62: static void client_stdin_callback(int, short, void *);
63: static void client_write(int, const char *, size_t);
64: static void client_signal(int);
65: static void client_dispatch(struct imsg *, void *);
66: static void client_dispatch_attached(struct imsg *);
1.121 nicm 67: static void client_dispatch_wait(struct imsg *);
1.114 nicm 68: static const char *client_exit_message(void);
1.25 nicm 69:
1.49 nicm 70: /*
71: * Get server create lock. If already held then server start is happening in
1.110 nicm 72: * another client, so block until the lock is released and return -2 to
73: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 74: */
1.114 nicm 75: static int
1.49 nicm 76: client_get_lock(char *lockfile)
77: {
78: int lockfd;
79:
1.110 nicm 80: log_debug("lock file is %s", lockfile);
81:
1.109 nicm 82: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 83: log_debug("open failed: %s", strerror(errno));
84: return (-1);
1.109 nicm 85: }
1.49 nicm 86:
1.82 nicm 87: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
88: log_debug("flock failed: %s", strerror(errno));
89: if (errno != EAGAIN)
90: return (lockfd);
91: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 92: /* nothing */;
93: close(lockfd);
1.110 nicm 94: return (-2);
1.49 nicm 95: }
1.82 nicm 96: log_debug("flock succeeded");
1.49 nicm 97:
98: return (lockfd);
99: }
100:
1.46 nicm 101: /* Connect client to server. */
1.114 nicm 102: static int
1.108 nicm 103: client_connect(struct event_base *base, const char *path, int start_server)
1.1 nicm 104: {
1.26 nicm 105: struct sockaddr_un sa;
106: size_t size;
1.82 nicm 107: int fd, lockfd = -1, locked = 0;
108: char *lockfile = NULL;
1.1 nicm 109:
110: memset(&sa, 0, sizeof sa);
111: sa.sun_family = AF_UNIX;
112: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
113: if (size >= sizeof sa.sun_path) {
114: errno = ENAMETOOLONG;
1.46 nicm 115: return (-1);
1.1 nicm 116: }
1.82 nicm 117: log_debug("socket is %s", path);
1.1 nicm 118:
1.49 nicm 119: retry:
1.10 nicm 120: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 121: return (-1);
1.1 nicm 122:
1.82 nicm 123: log_debug("trying connect");
1.109 nicm 124: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 125: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 126: if (errno != ECONNREFUSED && errno != ENOENT)
127: goto failed;
1.46 nicm 128: if (!start_server)
129: goto failed;
1.49 nicm 130: close(fd);
131:
1.82 nicm 132: if (!locked) {
133: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 134: if ((lockfd = client_get_lock(lockfile)) < 0) {
135: log_debug("didn't get lock (%d)", lockfd);
136:
1.82 nicm 137: free(lockfile);
1.110 nicm 138: lockfile = NULL;
139:
140: if (lockfd == -2)
141: goto retry;
1.82 nicm 142: }
1.110 nicm 143: log_debug("got lock (%d)", lockfd);
1.82 nicm 144:
145: /*
146: * Always retry at least once, even if we got the lock,
147: * because another client could have taken the lock,
148: * started the server and released the lock between our
149: * connect() and flock().
150: */
151: locked = 1;
1.49 nicm 152: goto retry;
1.78 nicm 153: }
1.82 nicm 154:
1.110 nicm 155: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 156: free(lockfile);
157: close(lockfd);
1.49 nicm 158: return (-1);
1.78 nicm 159: }
1.122 nicm 160: fd = server_start(client_proc, base, lockfd, lockfile);
1.82 nicm 161: }
1.95 nicm 162:
1.110 nicm 163: if (locked && lockfd >= 0) {
1.58 nicm 164: free(lockfile);
1.49 nicm 165: close(lockfd);
1.1 nicm 166: }
1.47 nicm 167: setblocking(fd, 0);
1.46 nicm 168: return (fd);
169:
170: failed:
1.95 nicm 171: if (locked) {
172: free(lockfile);
173: close(lockfd);
174: }
1.46 nicm 175: close(fd);
176: return (-1);
177: }
178:
1.52 nicm 179: /* Get exit string from reason number. */
180: const char *
181: client_exit_message(void)
182: {
1.73 nicm 183: static char msg[256];
184:
1.52 nicm 185: switch (client_exitreason) {
186: case CLIENT_EXIT_NONE:
187: break;
188: case CLIENT_EXIT_DETACHED:
1.73 nicm 189: if (client_exitsession != NULL) {
190: xsnprintf(msg, sizeof msg, "detached "
191: "(from session %s)", client_exitsession);
192: return (msg);
193: }
1.52 nicm 194: return ("detached");
195: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 196: if (client_exitsession != NULL) {
197: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
198: "(from session %s)", client_exitsession);
199: return (msg);
200: }
1.52 nicm 201: return ("detached and SIGHUP");
202: case CLIENT_EXIT_LOST_TTY:
203: return ("lost tty");
204: case CLIENT_EXIT_TERMINATED:
205: return ("terminated");
206: case CLIENT_EXIT_LOST_SERVER:
207: return ("lost server");
208: case CLIENT_EXIT_EXITED:
209: return ("exited");
210: case CLIENT_EXIT_SERVER_EXITED:
211: return ("server exited");
212: }
213: return ("unknown reason");
214: }
215:
1.46 nicm 216: /* Client main loop. */
217: int
1.121 nicm 218: client_main(struct event_base *base, int argc, char **argv, int flags)
1.46 nicm 219: {
220: struct cmd *cmd;
221: struct cmd_list *cmdlist;
1.70 nicm 222: struct msg_command_data *data;
1.98 nicm 223: int cmdflags, fd, i;
224: const char *ttynam, *cwd;
1.48 nicm 225: pid_t ppid;
1.46 nicm 226: enum msgtype msg;
1.98 nicm 227: char *cause, path[PATH_MAX];
1.56 nicm 228: struct termios tio, saved_tio;
1.70 nicm 229: size_t size;
1.46 nicm 230:
1.99 nicm 231: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
232: signal(SIGCHLD, SIG_IGN);
233:
1.93 nicm 234: /* Save the flags. */
235: client_flags = flags;
236:
1.46 nicm 237: /* Set up the initial command. */
238: cmdflags = 0;
1.121 nicm 239: if (shell_command != NULL) {
1.46 nicm 240: msg = MSG_SHELL;
241: cmdflags = CMD_STARTSERVER;
242: } else if (argc == 0) {
243: msg = MSG_COMMAND;
1.89 nicm 244: cmdflags = CMD_STARTSERVER;
1.46 nicm 245: } else {
246: msg = MSG_COMMAND;
247:
248: /*
249: * It sucks parsing the command string twice (in client and
250: * later in server) but it is necessary to get the start server
251: * flag.
252: */
1.62 nicm 253: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
1.120 nicm 254: if (cmdlist != NULL) {
255: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
256: if (cmd->entry->flags & CMD_STARTSERVER)
257: cmdflags |= CMD_STARTSERVER;
258: }
259: cmd_list_free(cmdlist);
1.117 nicm 260: }
1.46 nicm 261: }
262:
1.109 nicm 263: /* Create client process structure (starts logging). */
1.122 nicm 264: client_proc = proc_start("client");
265: proc_set_signals(client_proc, client_signal);
1.109 nicm 266:
1.82 nicm 267: /* Initialize the client socket and start the server. */
1.92 nicm 268: fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
1.46 nicm 269: if (fd == -1) {
1.87 nicm 270: if (errno == ECONNREFUSED) {
271: fprintf(stderr, "no server running on %s\n",
272: socket_path);
273: } else {
274: fprintf(stderr, "error connecting to %s (%s)\n",
275: socket_path, strerror(errno));
276: }
1.46 nicm 277: return (1);
278: }
1.121 nicm 279: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 280:
1.97 nicm 281: /* Save these before pledge(). */
1.102 nicm 282: if ((cwd = getcwd(path, sizeof path)) == NULL) {
283: if ((cwd = find_home()) == NULL)
284: cwd = "/";
285: }
1.97 nicm 286: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
287: ttynam = "";
288:
289: /*
290: * Drop privileges for client. "proc exec" is needed for -c and for
291: * locking (which uses system(3)).
292: *
293: * "tty" is needed to restore termios(4) and also for some reason -CC
294: * does not work properly without it (input is not recognised).
295: *
296: * "sendfd" is dropped later in client_dispatch_wait().
297: */
1.105 nicm 298: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
1.97 nicm 299: fatal("pledge failed");
300:
301: /* Free stuff that is not used in the client. */
1.119 nicm 302: if (ptm_fd != -1)
303: close(ptm_fd);
1.100 nicm 304: options_free(global_options);
305: options_free(global_s_options);
306: options_free(global_w_options);
1.101 nicm 307: environ_free(global_environ);
1.46 nicm 308:
1.54 nicm 309: /* Create stdin handler. */
310: setblocking(STDIN_FILENO, 0);
311: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
312: client_stdin_callback, NULL);
1.93 nicm 313: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 314: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
315: fprintf(stderr, "tcgetattr failed: %s\n",
316: strerror(errno));
317: return (1);
318: }
1.56 nicm 319: cfmakeraw(&tio);
320: tio.c_iflag = ICRNL|IXANY;
321: tio.c_oflag = OPOST|ONLCR;
322: tio.c_lflag = NOKERNINFO;
323: tio.c_cflag = CREAD|CS8|HUPCL;
324: tio.c_cc[VMIN] = 1;
325: tio.c_cc[VTIME] = 0;
326: cfsetispeed(&tio, cfgetispeed(&saved_tio));
327: cfsetospeed(&tio, cfgetospeed(&saved_tio));
328: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
329: }
1.1 nicm 330:
1.71 nicm 331: /* Send identify messages. */
1.98 nicm 332: client_send_identify(ttynam, cwd);
1.1 nicm 333:
1.46 nicm 334: /* Send first command. */
335: if (msg == MSG_COMMAND) {
1.70 nicm 336: /* How big is the command? */
337: size = 0;
338: for (i = 0; i < argc; i++)
339: size += strlen(argv[i]) + 1;
1.124 nicm 340: if (size > MAX_IMSGSIZE - (sizeof *data)) {
341: fprintf(stderr, "command too long\n");
342: return (1);
343: }
1.70 nicm 344: data = xmalloc((sizeof *data) + size);
1.46 nicm 345:
346: /* Prepare command for server. */
1.70 nicm 347: data->argc = argc;
1.83 nicm 348: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 349: fprintf(stderr, "command too long\n");
1.70 nicm 350: free(data);
1.46 nicm 351: return (1);
352: }
1.70 nicm 353: size += sizeof *data;
1.46 nicm 354:
1.70 nicm 355: /* Send the command. */
1.99 nicm 356: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 357: fprintf(stderr, "failed to send command\n");
358: free(data);
359: return (1);
360: }
361: free(data);
1.46 nicm 362: } else if (msg == MSG_SHELL)
1.99 nicm 363: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 364:
1.99 nicm 365: /* Start main loop. */
366: proc_loop(client_proc, NULL);
1.46 nicm 367:
1.115 nicm 368: /* Run command if user requested exec, instead of exiting. */
369: if (client_exittype == MSG_EXEC) {
370: if (client_flags & CLIENT_CONTROLCONTROL)
371: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
372: client_exec(client_execshell, client_execcmd);
373: }
374:
1.46 nicm 375: /* Print the exit message, if any, and exit. */
1.48 nicm 376: if (client_attached) {
1.93 nicm 377: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 378: printf("[%s]\n", client_exit_message());
1.48 nicm 379:
380: ppid = getppid();
381: if (client_exittype == MSG_DETACHKILL && ppid > 1)
382: kill(ppid, SIGHUP);
1.93 nicm 383: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 384: if (client_exitreason != CLIENT_EXIT_NONE)
385: printf("%%exit %s\n", client_exit_message());
386: else
387: printf("%%exit\n");
388: printf("\033\\");
1.56 nicm 389: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 390: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 391: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 392: setblocking(STDIN_FILENO, 1);
1.46 nicm 393: return (client_exitval);
1.1 nicm 394: }
395:
1.71 nicm 396: /* Send identify messages to server. */
1.114 nicm 397: static void
1.98 nicm 398: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 399: {
1.90 nicm 400: const char *s;
1.71 nicm 401: char **ss;
1.91 nicm 402: size_t sslen;
1.93 nicm 403: int fd, flags = client_flags;
1.90 nicm 404: pid_t pid;
1.71 nicm 405:
1.99 nicm 406: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 407:
408: if ((s = getenv("TERM")) == NULL)
409: s = "";
1.99 nicm 410: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 411:
1.107 nicm 412: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
413: strlen(ttynam) + 1);
1.99 nicm 414: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 415:
1.50 nicm 416: if ((fd = dup(STDIN_FILENO)) == -1)
417: fatal("dup failed");
1.99 nicm 418: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 419:
420: pid = getpid();
1.99 nicm 421: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 422:
1.91 nicm 423: for (ss = environ; *ss != NULL; ss++) {
424: sslen = strlen(*ss) + 1;
1.107 nicm 425: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
426: continue;
427: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 428: }
1.75 nicm 429:
1.99 nicm 430: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 431: }
432:
1.54 nicm 433: /* Callback for client stdin read events. */
1.114 nicm 434: static void
1.106 nicm 435: client_stdin_callback(__unused int fd, __unused short events,
436: __unused void *arg)
1.54 nicm 437: {
438: struct msg_stdin_data data;
439:
440: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
441: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
442: return;
443:
1.99 nicm 444: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 445: if (data.size <= 0)
446: event_del(&client_stdin);
447: }
448:
1.57 nicm 449: /* Force write to file descriptor. */
1.114 nicm 450: static void
1.57 nicm 451: client_write(int fd, const char *data, size_t size)
452: {
453: ssize_t used;
454:
1.125 ! nicm 455: log_debug("%s: %.*s", __func__, (int)size, data);
1.57 nicm 456: while (size != 0) {
457: used = write(fd, data, size);
458: if (used == -1) {
459: if (errno == EINTR || errno == EAGAIN)
460: continue;
461: break;
462: }
463: data += used;
464: size -= used;
465: }
466: }
467:
1.93 nicm 468: /* Run command in shell; used for -c. */
1.114 nicm 469: static __dead void
1.111 nicm 470: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 471: {
472: const char *name, *ptr;
473: char *argv0;
474:
1.111 nicm 475: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 476:
477: ptr = strrchr(shell, '/');
478: if (ptr != NULL && *(ptr + 1) != '\0')
479: name = ptr + 1;
480: else
481: name = shell;
482: if (client_flags & CLIENT_LOGIN)
483: xasprintf(&argv0, "-%s", name);
484: else
485: xasprintf(&argv0, "%s", name);
486: setenv("SHELL", shell, 1);
487:
1.123 nicm 488: proc_clear_signals(client_proc, 1);
489:
1.93 nicm 490: setblocking(STDIN_FILENO, 1);
491: setblocking(STDOUT_FILENO, 1);
492: setblocking(STDERR_FILENO, 1);
493: closefrom(STDERR_FILENO + 1);
494:
1.111 nicm 495: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 496: fatal("execl failed");
497: }
498:
1.99 nicm 499: /* Callback to handle signals in the client. */
1.114 nicm 500: static void
1.99 nicm 501: client_signal(int sig)
502: {
503: struct sigaction sigact;
504: int status;
505:
506: if (sig == SIGCHLD)
507: waitpid(WAIT_ANY, &status, WNOHANG);
508: else if (!client_attached) {
509: if (sig == SIGTERM)
510: proc_exit(client_proc);
511: } else {
512: switch (sig) {
513: case SIGHUP:
514: client_exitreason = CLIENT_EXIT_LOST_TTY;
515: client_exitval = 1;
516: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
517: break;
518: case SIGTERM:
519: client_exitreason = CLIENT_EXIT_TERMINATED;
520: client_exitval = 1;
521: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
522: break;
523: case SIGWINCH:
524: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
525: break;
526: case SIGCONT:
527: memset(&sigact, 0, sizeof sigact);
528: sigemptyset(&sigact.sa_mask);
529: sigact.sa_flags = SA_RESTART;
530: sigact.sa_handler = SIG_IGN;
531: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
532: fatal("sigaction failed");
533: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
534: break;
535: }
536: }
537: }
538:
539: /* Callback for client read events. */
1.114 nicm 540: static void
1.121 nicm 541: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 542: {
543: if (imsg == NULL) {
544: client_exitreason = CLIENT_EXIT_LOST_SERVER;
545: client_exitval = 1;
1.109 nicm 546: proc_exit(client_proc);
547: return;
548: }
549:
550: if (client_attached)
1.99 nicm 551: client_dispatch_attached(imsg);
552: else
1.121 nicm 553: client_dispatch_wait(imsg);
1.99 nicm 554: }
555:
1.46 nicm 556: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 557: static void
1.121 nicm 558: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 559: {
1.69 nicm 560: char *data;
1.99 nicm 561: ssize_t datalen;
1.69 nicm 562: struct msg_stdout_data stdoutdata;
563: struct msg_stderr_data stderrdata;
564: int retval;
1.97 nicm 565: static int pledge_applied;
566:
567: /*
568: * "sendfd" is no longer required once all of the identify messages
569: * have been sent. We know the server won't send us anything until that
570: * point (because we don't ask it to), so we can drop "sendfd" once we
571: * get the first message from the server.
572: */
573: if (!pledge_applied) {
1.105 nicm 574: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 575: fatal("pledge failed");
576: pledge_applied = 1;
577: };
1.46 nicm 578:
1.99 nicm 579: data = imsg->data;
580: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 581:
1.99 nicm 582: switch (imsg->hdr.type) {
583: case MSG_EXIT:
584: case MSG_SHUTDOWN:
585: if (datalen != sizeof retval && datalen != 0)
586: fatalx("bad MSG_EXIT size");
587: if (datalen == sizeof retval) {
588: memcpy(&retval, data, sizeof retval);
589: client_exitval = retval;
590: }
591: proc_exit(client_proc);
592: break;
593: case MSG_READY:
594: if (datalen != 0)
595: fatalx("bad MSG_READY size");
1.54 nicm 596:
1.99 nicm 597: event_del(&client_stdin);
598: client_attached = 1;
599: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
600: break;
601: case MSG_STDIN:
602: if (datalen != 0)
603: fatalx("bad MSG_STDIN size");
1.54 nicm 604:
1.99 nicm 605: event_add(&client_stdin, NULL);
606: break;
607: case MSG_STDOUT:
608: if (datalen != sizeof stdoutdata)
609: fatalx("bad MSG_STDOUT size");
610: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 611:
1.99 nicm 612: client_write(STDOUT_FILENO, stdoutdata.data,
613: stdoutdata.size);
614: break;
615: case MSG_STDERR:
616: if (datalen != sizeof stderrdata)
617: fatalx("bad MSG_STDERR size");
618: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 619:
1.99 nicm 620: client_write(STDERR_FILENO, stderrdata.data,
621: stderrdata.size);
622: break;
623: case MSG_VERSION:
624: if (datalen != 0)
625: fatalx("bad MSG_VERSION size");
626:
627: fprintf(stderr, "protocol version mismatch "
628: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 629: imsg->hdr.peerid & 0xff);
1.99 nicm 630: client_exitval = 1;
631: proc_exit(client_proc);
632: break;
633: case MSG_SHELL:
634: if (datalen == 0 || data[datalen - 1] != '\0')
635: fatalx("bad MSG_SHELL string");
636:
1.121 nicm 637: client_exec(data, shell_command);
1.99 nicm 638: /* NOTREACHED */
639: case MSG_DETACH:
640: case MSG_DETACHKILL:
641: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
642: break;
643: case MSG_EXITED:
644: proc_exit(client_proc);
645: break;
1.46 nicm 646: }
647: }
648:
649: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 650: static void
1.99 nicm 651: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 652: {
1.69 nicm 653: struct sigaction sigact;
654: char *data;
1.99 nicm 655: ssize_t datalen;
1.9 nicm 656:
1.99 nicm 657: data = imsg->data;
658: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 659:
1.99 nicm 660: switch (imsg->hdr.type) {
661: case MSG_DETACH:
662: case MSG_DETACHKILL:
663: if (datalen == 0 || data[datalen - 1] != '\0')
664: fatalx("bad MSG_DETACH string");
665:
666: client_exitsession = xstrdup(data);
667: client_exittype = imsg->hdr.type;
668: if (imsg->hdr.type == MSG_DETACHKILL)
669: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
670: else
671: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 672: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
673: break;
674: case MSG_EXEC:
675: if (datalen == 0 || data[datalen - 1] != '\0' ||
676: strlen(data) + 1 == (size_t)datalen)
677: fatalx("bad MSG_EXEC string");
678: client_execcmd = xstrdup(data);
679: client_execshell = xstrdup(data + strlen(data) + 1);
680:
681: client_exittype = imsg->hdr.type;
1.99 nicm 682: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
683: break;
684: case MSG_EXIT:
685: if (datalen != 0 && datalen != sizeof (int))
686: fatalx("bad MSG_EXIT size");
1.9 nicm 687:
1.99 nicm 688: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
689: client_exitreason = CLIENT_EXIT_EXITED;
690: break;
691: case MSG_EXITED:
692: if (datalen != 0)
693: fatalx("bad MSG_EXITED size");
1.9 nicm 694:
1.99 nicm 695: proc_exit(client_proc);
696: break;
697: case MSG_SHUTDOWN:
698: if (datalen != 0)
699: fatalx("bad MSG_SHUTDOWN size");
700:
701: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
702: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
703: client_exitval = 1;
704: break;
705: case MSG_SUSPEND:
706: if (datalen != 0)
707: fatalx("bad MSG_SUSPEND size");
708:
709: memset(&sigact, 0, sizeof sigact);
710: sigemptyset(&sigact.sa_mask);
711: sigact.sa_flags = SA_RESTART;
712: sigact.sa_handler = SIG_DFL;
713: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
714: fatal("sigaction failed");
715: kill(getpid(), SIGTSTP);
716: break;
717: case MSG_LOCK:
718: if (datalen == 0 || data[datalen - 1] != '\0')
719: fatalx("bad MSG_LOCK string");
1.9 nicm 720:
1.99 nicm 721: system(data);
722: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
723: break;
1.9 nicm 724: }
1.1 nicm 725: }
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