Annotation of src/usr.bin/tmux/client.c, Revision 1.114
1.114 ! nicm 1: /* $OpenBSD: client.c,v 1.113 2016/01/19 15:59:12 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;
! 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 *);
! 65: static void client_dispatch_wait(struct imsg *, const char *);
! 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: }
1.92 nicm 158: fd = server_start(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:
205: return ("lost server");
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
1.111 nicm 216: client_main(struct event_base *base, int argc, char **argv, int flags,
217: const char *shellcmd)
1.46 nicm 218: {
219: struct cmd *cmd;
220: struct cmd_list *cmdlist;
1.70 nicm 221: struct msg_command_data *data;
1.98 nicm 222: int cmdflags, fd, i;
223: const char *ttynam, *cwd;
1.48 nicm 224: pid_t ppid;
1.46 nicm 225: enum msgtype msg;
1.98 nicm 226: char *cause, path[PATH_MAX];
1.56 nicm 227: struct termios tio, saved_tio;
1.70 nicm 228: size_t size;
1.46 nicm 229:
1.99 nicm 230: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
231: signal(SIGCHLD, SIG_IGN);
232:
1.93 nicm 233: /* Save the flags. */
234: client_flags = flags;
235:
1.46 nicm 236: /* Set up the initial command. */
237: cmdflags = 0;
1.111 nicm 238: if (shellcmd != NULL) {
1.46 nicm 239: msg = MSG_SHELL;
240: cmdflags = CMD_STARTSERVER;
241: } else if (argc == 0) {
242: msg = MSG_COMMAND;
1.89 nicm 243: cmdflags = CMD_STARTSERVER;
1.46 nicm 244: } else {
245: msg = MSG_COMMAND;
246:
247: /*
248: * It sucks parsing the command string twice (in client and
249: * later in server) but it is necessary to get the start server
250: * flag.
251: */
1.62 nicm 252: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
253: if (cmdlist == NULL) {
1.59 nicm 254: fprintf(stderr, "%s\n", cause);
1.46 nicm 255: return (1);
256: }
257: cmdflags &= ~CMD_STARTSERVER;
258: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
259: if (cmd->entry->flags & CMD_STARTSERVER)
260: cmdflags |= CMD_STARTSERVER;
261: }
262: cmd_list_free(cmdlist);
263: }
264:
1.109 nicm 265: /* Create client process structure (starts logging). */
266: client_proc = proc_start("client", base, 0, client_signal);
267:
1.82 nicm 268: /* Initialize the client socket and start the server. */
1.92 nicm 269: fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
1.46 nicm 270: if (fd == -1) {
1.87 nicm 271: if (errno == ECONNREFUSED) {
272: fprintf(stderr, "no server running on %s\n",
273: socket_path);
274: } else {
275: fprintf(stderr, "error connecting to %s (%s)\n",
276: socket_path, strerror(errno));
277: }
1.46 nicm 278: return (1);
279: }
1.111 nicm 280: client_peer = proc_add_peer(client_proc, fd, client_dispatch,
281: (void *)shellcmd);
1.99 nicm 282:
1.97 nicm 283: /* Save these before pledge(). */
1.102 nicm 284: if ((cwd = getcwd(path, sizeof path)) == NULL) {
285: if ((cwd = find_home()) == NULL)
286: cwd = "/";
287: }
1.97 nicm 288: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
289: ttynam = "";
290:
291: /*
292: * Drop privileges for client. "proc exec" is needed for -c and for
293: * locking (which uses system(3)).
294: *
295: * "tty" is needed to restore termios(4) and also for some reason -CC
296: * does not work properly without it (input is not recognised).
297: *
298: * "sendfd" is dropped later in client_dispatch_wait().
299: */
1.105 nicm 300: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
1.97 nicm 301: fatal("pledge failed");
302:
303: /* Free stuff that is not used in the client. */
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) {
1.107 nicm 314: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0)
315: fatal("tcgetattr failed");
1.56 nicm 316: cfmakeraw(&tio);
317: tio.c_iflag = ICRNL|IXANY;
318: tio.c_oflag = OPOST|ONLCR;
319: tio.c_lflag = NOKERNINFO;
320: tio.c_cflag = CREAD|CS8|HUPCL;
321: tio.c_cc[VMIN] = 1;
322: tio.c_cc[VTIME] = 0;
323: cfsetispeed(&tio, cfgetispeed(&saved_tio));
324: cfsetospeed(&tio, cfgetospeed(&saved_tio));
325: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
326: }
1.1 nicm 327:
1.71 nicm 328: /* Send identify messages. */
1.98 nicm 329: client_send_identify(ttynam, cwd);
1.1 nicm 330:
1.46 nicm 331: /* Send first command. */
332: if (msg == MSG_COMMAND) {
1.70 nicm 333: /* How big is the command? */
334: size = 0;
335: for (i = 0; i < argc; i++)
336: size += strlen(argv[i]) + 1;
337: data = xmalloc((sizeof *data) + size);
1.46 nicm 338:
339: /* Prepare command for server. */
1.70 nicm 340: data->argc = argc;
1.83 nicm 341: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 342: fprintf(stderr, "command too long\n");
1.70 nicm 343: free(data);
1.46 nicm 344: return (1);
345: }
1.70 nicm 346: size += sizeof *data;
1.46 nicm 347:
1.70 nicm 348: /* Send the command. */
1.99 nicm 349: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 350: fprintf(stderr, "failed to send command\n");
351: free(data);
352: return (1);
353: }
354: free(data);
1.46 nicm 355: } else if (msg == MSG_SHELL)
1.99 nicm 356: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 357:
1.99 nicm 358: /* Start main loop. */
359: proc_loop(client_proc, NULL);
1.46 nicm 360:
361: /* Print the exit message, if any, and exit. */
1.48 nicm 362: if (client_attached) {
1.93 nicm 363: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 364: printf("[%s]\n", client_exit_message());
1.48 nicm 365:
366: ppid = getppid();
367: if (client_exittype == MSG_DETACHKILL && ppid > 1)
368: kill(ppid, SIGHUP);
1.93 nicm 369: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 370: if (client_exitreason != CLIENT_EXIT_NONE)
371: printf("%%exit %s\n", client_exit_message());
372: else
373: printf("%%exit\n");
374: printf("\033\\");
1.56 nicm 375: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 376: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 377: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 378: setblocking(STDIN_FILENO, 1);
1.46 nicm 379: return (client_exitval);
1.1 nicm 380: }
381:
1.71 nicm 382: /* Send identify messages to server. */
1.114 ! nicm 383: static void
1.98 nicm 384: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 385: {
1.90 nicm 386: const char *s;
1.71 nicm 387: char **ss;
1.91 nicm 388: size_t sslen;
1.93 nicm 389: int fd, flags = client_flags;
1.90 nicm 390: pid_t pid;
1.71 nicm 391:
1.99 nicm 392: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 393:
394: if ((s = getenv("TERM")) == NULL)
395: s = "";
1.99 nicm 396: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 397:
1.107 nicm 398: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
399: strlen(ttynam) + 1);
1.99 nicm 400: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 401:
1.50 nicm 402: if ((fd = dup(STDIN_FILENO)) == -1)
403: fatal("dup failed");
1.99 nicm 404: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 405:
406: pid = getpid();
1.99 nicm 407: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 408:
1.91 nicm 409: for (ss = environ; *ss != NULL; ss++) {
410: sslen = strlen(*ss) + 1;
1.107 nicm 411: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
412: continue;
413: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 414: }
1.75 nicm 415:
1.99 nicm 416: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 417: }
418:
1.54 nicm 419: /* Callback for client stdin read events. */
1.114 ! nicm 420: static void
1.106 nicm 421: client_stdin_callback(__unused int fd, __unused short events,
422: __unused void *arg)
1.54 nicm 423: {
424: struct msg_stdin_data data;
425:
426: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
427: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
428: return;
429:
1.99 nicm 430: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 431: if (data.size <= 0)
432: event_del(&client_stdin);
433: }
434:
1.57 nicm 435: /* Force write to file descriptor. */
1.114 ! nicm 436: static void
1.57 nicm 437: client_write(int fd, const char *data, size_t size)
438: {
439: ssize_t used;
440:
441: while (size != 0) {
442: used = write(fd, data, size);
443: if (used == -1) {
444: if (errno == EINTR || errno == EAGAIN)
445: continue;
446: break;
447: }
448: data += used;
449: size -= used;
450: }
451: }
452:
1.93 nicm 453: /* Run command in shell; used for -c. */
1.114 ! nicm 454: static __dead void
1.111 nicm 455: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 456: {
457: const char *name, *ptr;
458: char *argv0;
459:
1.111 nicm 460: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 461:
462: ptr = strrchr(shell, '/');
463: if (ptr != NULL && *(ptr + 1) != '\0')
464: name = ptr + 1;
465: else
466: name = shell;
467: if (client_flags & CLIENT_LOGIN)
468: xasprintf(&argv0, "-%s", name);
469: else
470: xasprintf(&argv0, "%s", name);
471: setenv("SHELL", shell, 1);
472:
473: setblocking(STDIN_FILENO, 1);
474: setblocking(STDOUT_FILENO, 1);
475: setblocking(STDERR_FILENO, 1);
476: closefrom(STDERR_FILENO + 1);
477:
1.111 nicm 478: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 479: fatal("execl failed");
480: }
481:
1.99 nicm 482: /* Callback to handle signals in the client. */
1.114 ! nicm 483: static void
1.99 nicm 484: client_signal(int sig)
485: {
486: struct sigaction sigact;
487: int status;
488:
489: if (sig == SIGCHLD)
490: waitpid(WAIT_ANY, &status, WNOHANG);
491: else if (!client_attached) {
492: if (sig == SIGTERM)
493: proc_exit(client_proc);
494: } else {
495: switch (sig) {
496: case SIGHUP:
497: client_exitreason = CLIENT_EXIT_LOST_TTY;
498: client_exitval = 1;
499: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
500: break;
501: case SIGTERM:
502: client_exitreason = CLIENT_EXIT_TERMINATED;
503: client_exitval = 1;
504: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
505: break;
506: case SIGWINCH:
507: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
508: break;
509: case SIGCONT:
510: memset(&sigact, 0, sizeof sigact);
511: sigemptyset(&sigact.sa_mask);
512: sigact.sa_flags = SA_RESTART;
513: sigact.sa_handler = SIG_IGN;
514: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
515: fatal("sigaction failed");
516: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
517: break;
518: }
519: }
520: }
521:
522: /* Callback for client read events. */
1.114 ! nicm 523: static void
1.111 nicm 524: client_dispatch(struct imsg *imsg, void *arg)
1.99 nicm 525: {
526: if (imsg == NULL) {
527: client_exitreason = CLIENT_EXIT_LOST_SERVER;
528: client_exitval = 1;
1.109 nicm 529: proc_exit(client_proc);
530: return;
531: }
532:
533: if (client_attached)
1.99 nicm 534: client_dispatch_attached(imsg);
535: else
1.111 nicm 536: client_dispatch_wait(imsg, arg);
1.99 nicm 537: }
538:
1.46 nicm 539: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 ! nicm 540: static void
1.111 nicm 541: client_dispatch_wait(struct imsg *imsg, const char *shellcmd)
1.46 nicm 542: {
1.69 nicm 543: char *data;
1.99 nicm 544: ssize_t datalen;
1.69 nicm 545: struct msg_stdout_data stdoutdata;
546: struct msg_stderr_data stderrdata;
547: int retval;
1.97 nicm 548: static int pledge_applied;
549:
550: /*
551: * "sendfd" is no longer required once all of the identify messages
552: * have been sent. We know the server won't send us anything until that
553: * point (because we don't ask it to), so we can drop "sendfd" once we
554: * get the first message from the server.
555: */
556: if (!pledge_applied) {
1.105 nicm 557: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 558: fatal("pledge failed");
559: pledge_applied = 1;
560: };
1.46 nicm 561:
1.99 nicm 562: data = imsg->data;
563: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 564:
1.99 nicm 565: switch (imsg->hdr.type) {
566: case MSG_EXIT:
567: case MSG_SHUTDOWN:
568: if (datalen != sizeof retval && datalen != 0)
569: fatalx("bad MSG_EXIT size");
570: if (datalen == sizeof retval) {
571: memcpy(&retval, data, sizeof retval);
572: client_exitval = retval;
573: }
574: proc_exit(client_proc);
575: break;
576: case MSG_READY:
577: if (datalen != 0)
578: fatalx("bad MSG_READY size");
1.54 nicm 579:
1.99 nicm 580: event_del(&client_stdin);
581: client_attached = 1;
582: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
583: break;
584: case MSG_STDIN:
585: if (datalen != 0)
586: fatalx("bad MSG_STDIN size");
1.54 nicm 587:
1.99 nicm 588: event_add(&client_stdin, NULL);
589: break;
590: case MSG_STDOUT:
591: if (datalen != sizeof stdoutdata)
592: fatalx("bad MSG_STDOUT size");
593: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 594:
1.99 nicm 595: client_write(STDOUT_FILENO, stdoutdata.data,
596: stdoutdata.size);
597: break;
598: case MSG_STDERR:
599: if (datalen != sizeof stderrdata)
600: fatalx("bad MSG_STDERR size");
601: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 602:
1.99 nicm 603: client_write(STDERR_FILENO, stderrdata.data,
604: stderrdata.size);
605: break;
606: case MSG_VERSION:
607: if (datalen != 0)
608: fatalx("bad MSG_VERSION size");
609:
610: fprintf(stderr, "protocol version mismatch "
611: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 612: imsg->hdr.peerid & 0xff);
1.99 nicm 613: client_exitval = 1;
614: proc_exit(client_proc);
615: break;
616: case MSG_SHELL:
617: if (datalen == 0 || data[datalen - 1] != '\0')
618: fatalx("bad MSG_SHELL string");
619:
620: clear_signals(0);
1.111 nicm 621: client_exec(data, shellcmd);
1.99 nicm 622: /* NOTREACHED */
623: case MSG_DETACH:
624: case MSG_DETACHKILL:
625: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
626: break;
627: case MSG_EXITED:
628: proc_exit(client_proc);
629: break;
1.46 nicm 630: }
631: }
632:
633: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 ! nicm 634: static void
1.99 nicm 635: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 636: {
1.69 nicm 637: struct sigaction sigact;
638: char *data;
1.99 nicm 639: ssize_t datalen;
1.9 nicm 640:
1.99 nicm 641: data = imsg->data;
642: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 643:
1.99 nicm 644: switch (imsg->hdr.type) {
645: case MSG_DETACH:
646: case MSG_DETACHKILL:
647: if (datalen == 0 || data[datalen - 1] != '\0')
648: fatalx("bad MSG_DETACH string");
649:
650: client_exitsession = xstrdup(data);
651: client_exittype = imsg->hdr.type;
652: if (imsg->hdr.type == MSG_DETACHKILL)
653: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
654: else
655: client_exitreason = CLIENT_EXIT_DETACHED;
656: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
657: break;
658: case MSG_EXIT:
659: if (datalen != 0 && datalen != sizeof (int))
660: fatalx("bad MSG_EXIT size");
1.9 nicm 661:
1.99 nicm 662: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
663: client_exitreason = CLIENT_EXIT_EXITED;
664: break;
665: case MSG_EXITED:
666: if (datalen != 0)
667: fatalx("bad MSG_EXITED size");
1.9 nicm 668:
1.99 nicm 669: proc_exit(client_proc);
670: break;
671: case MSG_SHUTDOWN:
672: if (datalen != 0)
673: fatalx("bad MSG_SHUTDOWN size");
674:
675: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
676: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
677: client_exitval = 1;
678: break;
679: case MSG_SUSPEND:
680: if (datalen != 0)
681: fatalx("bad MSG_SUSPEND size");
682:
683: memset(&sigact, 0, sizeof sigact);
684: sigemptyset(&sigact.sa_mask);
685: sigact.sa_flags = SA_RESTART;
686: sigact.sa_handler = SIG_DFL;
687: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
688: fatal("sigaction failed");
689: kill(getpid(), SIGTSTP);
690: break;
691: case MSG_LOCK:
692: if (datalen == 0 || data[datalen - 1] != '\0')
693: fatalx("bad MSG_LOCK string");
1.9 nicm 694:
1.99 nicm 695: system(data);
696: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
697: break;
1.9 nicm 698: }
1.1 nicm 699: }
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