Annotation of src/usr.bin/tmux/client.c, Revision 1.119
1.119 ! nicm 1: /* $OpenBSD: client.c,v 1.118 2017/01/20 14:02:33 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 *);
67: static void client_dispatch_wait(struct imsg *, const char *);
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: }
1.92 nicm 160: fd = server_start(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
1.111 nicm 218: client_main(struct event_base *base, int argc, char **argv, int flags,
219: const char *shellcmd)
1.46 nicm 220: {
221: struct cmd *cmd;
222: struct cmd_list *cmdlist;
1.70 nicm 223: struct msg_command_data *data;
1.98 nicm 224: int cmdflags, fd, i;
225: const char *ttynam, *cwd;
1.48 nicm 226: pid_t ppid;
1.46 nicm 227: enum msgtype msg;
1.98 nicm 228: char *cause, path[PATH_MAX];
1.56 nicm 229: struct termios tio, saved_tio;
1.70 nicm 230: size_t size;
1.46 nicm 231:
1.99 nicm 232: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
233: signal(SIGCHLD, SIG_IGN);
234:
1.93 nicm 235: /* Save the flags. */
236: client_flags = flags;
237:
1.46 nicm 238: /* Set up the initial command. */
239: cmdflags = 0;
1.111 nicm 240: if (shellcmd != NULL) {
1.46 nicm 241: msg = MSG_SHELL;
242: cmdflags = CMD_STARTSERVER;
243: } else if (argc == 0) {
244: msg = MSG_COMMAND;
1.89 nicm 245: cmdflags = CMD_STARTSERVER;
1.46 nicm 246: } else {
247: msg = MSG_COMMAND;
248:
249: /*
250: * It sucks parsing the command string twice (in client and
251: * later in server) but it is necessary to get the start server
252: * flag.
253: */
1.62 nicm 254: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
1.117 nicm 255: if (cmdlist == NULL) {
256: fprintf(stderr, "%s\n", cause);
257: return (1);
1.46 nicm 258: }
1.117 nicm 259: cmdflags &= ~CMD_STARTSERVER;
260: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
261: if (cmd->entry->flags & CMD_STARTSERVER)
262: cmdflags |= CMD_STARTSERVER;
263: }
264: cmd_list_free(cmdlist);
1.46 nicm 265: }
266:
1.109 nicm 267: /* Create client process structure (starts logging). */
268: client_proc = proc_start("client", base, 0, client_signal);
269:
1.82 nicm 270: /* Initialize the client socket and start the server. */
1.92 nicm 271: fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
1.46 nicm 272: if (fd == -1) {
1.87 nicm 273: if (errno == ECONNREFUSED) {
274: fprintf(stderr, "no server running on %s\n",
275: socket_path);
276: } else {
277: fprintf(stderr, "error connecting to %s (%s)\n",
278: socket_path, strerror(errno));
279: }
1.46 nicm 280: return (1);
281: }
1.111 nicm 282: client_peer = proc_add_peer(client_proc, fd, client_dispatch,
283: (void *)shellcmd);
1.99 nicm 284:
1.97 nicm 285: /* Save these before pledge(). */
1.102 nicm 286: if ((cwd = getcwd(path, sizeof path)) == NULL) {
287: if ((cwd = find_home()) == NULL)
288: cwd = "/";
289: }
1.97 nicm 290: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
291: ttynam = "";
292:
293: /*
294: * Drop privileges for client. "proc exec" is needed for -c and for
295: * locking (which uses system(3)).
296: *
297: * "tty" is needed to restore termios(4) and also for some reason -CC
298: * does not work properly without it (input is not recognised).
299: *
300: * "sendfd" is dropped later in client_dispatch_wait().
301: */
1.105 nicm 302: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
1.97 nicm 303: fatal("pledge failed");
304:
305: /* Free stuff that is not used in the client. */
1.119 ! nicm 306: if (ptm_fd != -1)
! 307: close(ptm_fd);
1.100 nicm 308: options_free(global_options);
309: options_free(global_s_options);
310: options_free(global_w_options);
1.101 nicm 311: environ_free(global_environ);
1.46 nicm 312:
1.54 nicm 313: /* Create stdin handler. */
314: setblocking(STDIN_FILENO, 0);
315: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
316: client_stdin_callback, NULL);
1.93 nicm 317: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 318: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
319: fprintf(stderr, "tcgetattr failed: %s\n",
320: strerror(errno));
321: return (1);
322: }
1.56 nicm 323: cfmakeraw(&tio);
324: tio.c_iflag = ICRNL|IXANY;
325: tio.c_oflag = OPOST|ONLCR;
326: tio.c_lflag = NOKERNINFO;
327: tio.c_cflag = CREAD|CS8|HUPCL;
328: tio.c_cc[VMIN] = 1;
329: tio.c_cc[VTIME] = 0;
330: cfsetispeed(&tio, cfgetispeed(&saved_tio));
331: cfsetospeed(&tio, cfgetospeed(&saved_tio));
332: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
333: }
1.1 nicm 334:
1.71 nicm 335: /* Send identify messages. */
1.98 nicm 336: client_send_identify(ttynam, cwd);
1.1 nicm 337:
1.46 nicm 338: /* Send first command. */
339: if (msg == MSG_COMMAND) {
1.70 nicm 340: /* How big is the command? */
341: size = 0;
342: for (i = 0; i < argc; i++)
343: size += strlen(argv[i]) + 1;
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: clear_signals(0);
373: client_exec(client_execshell, client_execcmd);
374: }
375:
1.46 nicm 376: /* Print the exit message, if any, and exit. */
1.48 nicm 377: if (client_attached) {
1.93 nicm 378: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 379: printf("[%s]\n", client_exit_message());
1.48 nicm 380:
381: ppid = getppid();
382: if (client_exittype == MSG_DETACHKILL && ppid > 1)
383: kill(ppid, SIGHUP);
1.93 nicm 384: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 385: if (client_exitreason != CLIENT_EXIT_NONE)
386: printf("%%exit %s\n", client_exit_message());
387: else
388: printf("%%exit\n");
389: printf("\033\\");
1.56 nicm 390: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 391: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 392: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 393: setblocking(STDIN_FILENO, 1);
1.46 nicm 394: return (client_exitval);
1.1 nicm 395: }
396:
1.71 nicm 397: /* Send identify messages to server. */
1.114 nicm 398: static void
1.98 nicm 399: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 400: {
1.90 nicm 401: const char *s;
1.71 nicm 402: char **ss;
1.91 nicm 403: size_t sslen;
1.93 nicm 404: int fd, flags = client_flags;
1.90 nicm 405: pid_t pid;
1.71 nicm 406:
1.99 nicm 407: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 408:
409: if ((s = getenv("TERM")) == NULL)
410: s = "";
1.99 nicm 411: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 412:
1.107 nicm 413: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
414: strlen(ttynam) + 1);
1.99 nicm 415: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 416:
1.50 nicm 417: if ((fd = dup(STDIN_FILENO)) == -1)
418: fatal("dup failed");
1.99 nicm 419: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 420:
421: pid = getpid();
1.99 nicm 422: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 423:
1.91 nicm 424: for (ss = environ; *ss != NULL; ss++) {
425: sslen = strlen(*ss) + 1;
1.107 nicm 426: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
427: continue;
428: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 429: }
1.75 nicm 430:
1.99 nicm 431: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 432: }
433:
1.54 nicm 434: /* Callback for client stdin read events. */
1.114 nicm 435: static void
1.106 nicm 436: client_stdin_callback(__unused int fd, __unused short events,
437: __unused void *arg)
1.54 nicm 438: {
439: struct msg_stdin_data data;
440:
441: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
442: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
443: return;
444:
1.99 nicm 445: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 446: if (data.size <= 0)
447: event_del(&client_stdin);
448: }
449:
1.57 nicm 450: /* Force write to file descriptor. */
1.114 nicm 451: static void
1.57 nicm 452: client_write(int fd, const char *data, size_t size)
453: {
454: ssize_t used;
455:
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:
488: setblocking(STDIN_FILENO, 1);
489: setblocking(STDOUT_FILENO, 1);
490: setblocking(STDERR_FILENO, 1);
491: closefrom(STDERR_FILENO + 1);
492:
1.111 nicm 493: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 494: fatal("execl failed");
495: }
496:
1.99 nicm 497: /* Callback to handle signals in the client. */
1.114 nicm 498: static void
1.99 nicm 499: client_signal(int sig)
500: {
501: struct sigaction sigact;
502: int status;
503:
504: if (sig == SIGCHLD)
505: waitpid(WAIT_ANY, &status, WNOHANG);
506: else if (!client_attached) {
507: if (sig == SIGTERM)
508: proc_exit(client_proc);
509: } else {
510: switch (sig) {
511: case SIGHUP:
512: client_exitreason = CLIENT_EXIT_LOST_TTY;
513: client_exitval = 1;
514: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
515: break;
516: case SIGTERM:
517: client_exitreason = CLIENT_EXIT_TERMINATED;
518: client_exitval = 1;
519: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
520: break;
521: case SIGWINCH:
522: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
523: break;
524: case SIGCONT:
525: memset(&sigact, 0, sizeof sigact);
526: sigemptyset(&sigact.sa_mask);
527: sigact.sa_flags = SA_RESTART;
528: sigact.sa_handler = SIG_IGN;
529: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
530: fatal("sigaction failed");
531: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
532: break;
533: }
534: }
535: }
536:
537: /* Callback for client read events. */
1.114 nicm 538: static void
1.111 nicm 539: client_dispatch(struct imsg *imsg, void *arg)
1.99 nicm 540: {
541: if (imsg == NULL) {
542: client_exitreason = CLIENT_EXIT_LOST_SERVER;
543: client_exitval = 1;
1.109 nicm 544: proc_exit(client_proc);
545: return;
546: }
547:
548: if (client_attached)
1.99 nicm 549: client_dispatch_attached(imsg);
550: else
1.111 nicm 551: client_dispatch_wait(imsg, arg);
1.99 nicm 552: }
553:
1.46 nicm 554: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 555: static void
1.111 nicm 556: client_dispatch_wait(struct imsg *imsg, const char *shellcmd)
1.46 nicm 557: {
1.69 nicm 558: char *data;
1.99 nicm 559: ssize_t datalen;
1.69 nicm 560: struct msg_stdout_data stdoutdata;
561: struct msg_stderr_data stderrdata;
562: int retval;
1.97 nicm 563: static int pledge_applied;
564:
565: /*
566: * "sendfd" is no longer required once all of the identify messages
567: * have been sent. We know the server won't send us anything until that
568: * point (because we don't ask it to), so we can drop "sendfd" once we
569: * get the first message from the server.
570: */
571: if (!pledge_applied) {
1.105 nicm 572: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 573: fatal("pledge failed");
574: pledge_applied = 1;
575: };
1.46 nicm 576:
1.99 nicm 577: data = imsg->data;
578: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 579:
1.99 nicm 580: switch (imsg->hdr.type) {
581: case MSG_EXIT:
582: case MSG_SHUTDOWN:
583: if (datalen != sizeof retval && datalen != 0)
584: fatalx("bad MSG_EXIT size");
585: if (datalen == sizeof retval) {
586: memcpy(&retval, data, sizeof retval);
587: client_exitval = retval;
588: }
589: proc_exit(client_proc);
590: break;
591: case MSG_READY:
592: if (datalen != 0)
593: fatalx("bad MSG_READY size");
1.54 nicm 594:
1.99 nicm 595: event_del(&client_stdin);
596: client_attached = 1;
597: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
598: break;
599: case MSG_STDIN:
600: if (datalen != 0)
601: fatalx("bad MSG_STDIN size");
1.54 nicm 602:
1.99 nicm 603: event_add(&client_stdin, NULL);
604: break;
605: case MSG_STDOUT:
606: if (datalen != sizeof stdoutdata)
607: fatalx("bad MSG_STDOUT size");
608: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 609:
1.99 nicm 610: client_write(STDOUT_FILENO, stdoutdata.data,
611: stdoutdata.size);
612: break;
613: case MSG_STDERR:
614: if (datalen != sizeof stderrdata)
615: fatalx("bad MSG_STDERR size");
616: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 617:
1.99 nicm 618: client_write(STDERR_FILENO, stderrdata.data,
619: stderrdata.size);
620: break;
621: case MSG_VERSION:
622: if (datalen != 0)
623: fatalx("bad MSG_VERSION size");
624:
625: fprintf(stderr, "protocol version mismatch "
626: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 627: imsg->hdr.peerid & 0xff);
1.99 nicm 628: client_exitval = 1;
629: proc_exit(client_proc);
630: break;
631: case MSG_SHELL:
632: if (datalen == 0 || data[datalen - 1] != '\0')
633: fatalx("bad MSG_SHELL string");
634:
635: clear_signals(0);
1.111 nicm 636: client_exec(data, shellcmd);
1.99 nicm 637: /* NOTREACHED */
638: case MSG_DETACH:
639: case MSG_DETACHKILL:
640: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
641: break;
642: case MSG_EXITED:
643: proc_exit(client_proc);
644: break;
1.46 nicm 645: }
646: }
647:
648: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 649: static void
1.99 nicm 650: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 651: {
1.69 nicm 652: struct sigaction sigact;
653: char *data;
1.99 nicm 654: ssize_t datalen;
1.9 nicm 655:
1.99 nicm 656: data = imsg->data;
657: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 658:
1.99 nicm 659: switch (imsg->hdr.type) {
660: case MSG_DETACH:
661: case MSG_DETACHKILL:
662: if (datalen == 0 || data[datalen - 1] != '\0')
663: fatalx("bad MSG_DETACH string");
664:
665: client_exitsession = xstrdup(data);
666: client_exittype = imsg->hdr.type;
667: if (imsg->hdr.type == MSG_DETACHKILL)
668: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
669: else
670: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 671: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
672: break;
673: case MSG_EXEC:
674: if (datalen == 0 || data[datalen - 1] != '\0' ||
675: strlen(data) + 1 == (size_t)datalen)
676: fatalx("bad MSG_EXEC string");
677: client_execcmd = xstrdup(data);
678: client_execshell = xstrdup(data + strlen(data) + 1);
679:
680: client_exittype = imsg->hdr.type;
1.99 nicm 681: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
682: break;
683: case MSG_EXIT:
684: if (datalen != 0 && datalen != sizeof (int))
685: fatalx("bad MSG_EXIT size");
1.9 nicm 686:
1.99 nicm 687: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
688: client_exitreason = CLIENT_EXIT_EXITED;
689: break;
690: case MSG_EXITED:
691: if (datalen != 0)
692: fatalx("bad MSG_EXITED size");
1.9 nicm 693:
1.99 nicm 694: proc_exit(client_proc);
695: break;
696: case MSG_SHUTDOWN:
697: if (datalen != 0)
698: fatalx("bad MSG_SHUTDOWN size");
699:
700: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
701: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
702: client_exitval = 1;
703: break;
704: case MSG_SUSPEND:
705: if (datalen != 0)
706: fatalx("bad MSG_SUSPEND size");
707:
708: memset(&sigact, 0, sizeof sigact);
709: sigemptyset(&sigact.sa_mask);
710: sigact.sa_flags = SA_RESTART;
711: sigact.sa_handler = SIG_DFL;
712: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
713: fatal("sigaction failed");
714: kill(getpid(), SIGTSTP);
715: break;
716: case MSG_LOCK:
717: if (datalen == 0 || data[datalen - 1] != '\0')
718: fatalx("bad MSG_LOCK string");
1.9 nicm 719:
1.99 nicm 720: system(data);
721: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
722: break;
1.9 nicm 723: }
1.1 nicm 724: }
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