Annotation of src/usr.bin/tmux/client.c, Revision 1.109
1.109 ! nicm 1: /* $OpenBSD: client.c,v 1.108 2015/11/24 22:27:22 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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:
1.99 nicm 37: struct tmuxproc *client_proc;
38: struct tmuxpeer *client_peer;
39: int client_flags;
40: struct event client_stdin;
1.52 nicm 41: enum {
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;
1.99 nicm 51: int client_exitval;
52: enum msgtype client_exittype;
53: const char *client_exitsession;
54: int client_attached;
1.1 nicm 55:
1.93 nicm 56: __dead void client_exec(const char *);
1.49 nicm 57: int client_get_lock(char *);
1.108 nicm 58: int client_connect(struct event_base *, const char *, int);
1.98 nicm 59: void client_send_identify(const char *, const char *);
1.54 nicm 60: void client_stdin_callback(int, short, void *);
1.57 nicm 61: void client_write(int, const char *, size_t);
1.99 nicm 62: void client_signal(int);
63: void client_dispatch(struct imsg *, void *);
64: void client_dispatch_attached(struct imsg *);
65: void client_dispatch_wait(struct imsg *);
1.53 nicm 66: 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
70: * another client, so block until the lock is released and return -1 to
71: * retry. Ignore other errors - just continue and start the server without the
72: * lock.
73: */
74: int
75: client_get_lock(char *lockfile)
76: {
77: int lockfd;
78:
1.109 ! nicm 79: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
! 80: lockfd = open("/dev/null", O_WRONLY);
! 81: if (lockfd == -1)
! 82: fatal("open failed");
! 83: return (lockfd);
! 84: }
1.82 nicm 85: log_debug("lock file is %s", lockfile);
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);
94: return (-1);
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. */
102: 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);
134: if ((lockfd = client_get_lock(lockfile)) == -1) {
135: log_debug("didn't get lock");
136: free(lockfile);
137: goto retry;
138: }
139: log_debug("got lock");
140:
141: /*
142: * Always retry at least once, even if we got the lock,
143: * because another client could have taken the lock,
144: * started the server and released the lock between our
145: * connect() and flock().
146: */
147: locked = 1;
1.49 nicm 148: goto retry;
1.78 nicm 149: }
1.82 nicm 150:
1.78 nicm 151: if (unlink(path) != 0 && errno != ENOENT) {
152: free(lockfile);
153: close(lockfd);
1.49 nicm 154: return (-1);
1.78 nicm 155: }
1.92 nicm 156: fd = server_start(base, lockfd, lockfile);
1.82 nicm 157: }
1.95 nicm 158:
1.82 nicm 159: if (locked) {
1.58 nicm 160: free(lockfile);
1.49 nicm 161: close(lockfd);
1.1 nicm 162: }
1.47 nicm 163: setblocking(fd, 0);
1.46 nicm 164: return (fd);
165:
166: failed:
1.95 nicm 167: if (locked) {
168: free(lockfile);
169: close(lockfd);
170: }
1.46 nicm 171: close(fd);
172: return (-1);
173: }
174:
1.52 nicm 175: /* Get exit string from reason number. */
176: const char *
177: client_exit_message(void)
178: {
1.73 nicm 179: static char msg[256];
180:
1.52 nicm 181: switch (client_exitreason) {
182: case CLIENT_EXIT_NONE:
183: break;
184: case CLIENT_EXIT_DETACHED:
1.73 nicm 185: if (client_exitsession != NULL) {
186: xsnprintf(msg, sizeof msg, "detached "
187: "(from session %s)", client_exitsession);
188: return (msg);
189: }
1.52 nicm 190: return ("detached");
191: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 192: if (client_exitsession != NULL) {
193: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
194: "(from session %s)", client_exitsession);
195: return (msg);
196: }
1.52 nicm 197: return ("detached and SIGHUP");
198: case CLIENT_EXIT_LOST_TTY:
199: return ("lost tty");
200: case CLIENT_EXIT_TERMINATED:
201: return ("terminated");
202: case CLIENT_EXIT_LOST_SERVER:
203: return ("lost server");
204: case CLIENT_EXIT_EXITED:
205: return ("exited");
206: case CLIENT_EXIT_SERVER_EXITED:
207: return ("server exited");
208: }
209: return ("unknown reason");
210: }
211:
1.46 nicm 212: /* Client main loop. */
213: int
1.92 nicm 214: client_main(struct event_base *base, int argc, char **argv, int flags)
1.46 nicm 215: {
216: struct cmd *cmd;
217: struct cmd_list *cmdlist;
1.70 nicm 218: struct msg_command_data *data;
1.98 nicm 219: int cmdflags, fd, i;
220: const char *ttynam, *cwd;
1.48 nicm 221: pid_t ppid;
1.46 nicm 222: enum msgtype msg;
1.98 nicm 223: char *cause, path[PATH_MAX];
1.56 nicm 224: struct termios tio, saved_tio;
1.70 nicm 225: size_t size;
1.46 nicm 226:
1.99 nicm 227: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
228: signal(SIGCHLD, SIG_IGN);
229:
1.93 nicm 230: /* Save the flags. */
231: client_flags = flags;
232:
1.46 nicm 233: /* Set up the initial command. */
234: cmdflags = 0;
235: if (shell_cmd != NULL) {
236: msg = MSG_SHELL;
237: cmdflags = CMD_STARTSERVER;
238: } else if (argc == 0) {
239: msg = MSG_COMMAND;
1.89 nicm 240: cmdflags = CMD_STARTSERVER;
1.46 nicm 241: } else {
242: msg = MSG_COMMAND;
243:
244: /*
245: * It sucks parsing the command string twice (in client and
246: * later in server) but it is necessary to get the start server
247: * flag.
248: */
1.62 nicm 249: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
250: if (cmdlist == NULL) {
1.59 nicm 251: fprintf(stderr, "%s\n", cause);
1.46 nicm 252: return (1);
253: }
254: cmdflags &= ~CMD_STARTSERVER;
255: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
256: if (cmd->entry->flags & CMD_STARTSERVER)
257: cmdflags |= CMD_STARTSERVER;
258: }
259: cmd_list_free(cmdlist);
260: }
261:
1.109 ! nicm 262: /* Create client process structure (starts logging). */
! 263: client_proc = proc_start("client", base, 0, client_signal);
! 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: }
1.99 nicm 277: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
278:
1.97 nicm 279: /* Save these before pledge(). */
1.102 nicm 280: if ((cwd = getcwd(path, sizeof path)) == NULL) {
281: if ((cwd = find_home()) == NULL)
282: cwd = "/";
283: }
1.97 nicm 284: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
285: ttynam = "";
286:
287: /*
288: * Drop privileges for client. "proc exec" is needed for -c and for
289: * locking (which uses system(3)).
290: *
291: * "tty" is needed to restore termios(4) and also for some reason -CC
292: * does not work properly without it (input is not recognised).
293: *
294: * "sendfd" is dropped later in client_dispatch_wait().
295: */
1.105 nicm 296: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
1.97 nicm 297: fatal("pledge failed");
298:
299: /* Free stuff that is not used in the client. */
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) {
1.107 nicm 310: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0)
311: fatal("tcgetattr failed");
1.56 nicm 312: cfmakeraw(&tio);
313: tio.c_iflag = ICRNL|IXANY;
314: tio.c_oflag = OPOST|ONLCR;
315: tio.c_lflag = NOKERNINFO;
316: tio.c_cflag = CREAD|CS8|HUPCL;
317: tio.c_cc[VMIN] = 1;
318: tio.c_cc[VTIME] = 0;
319: cfsetispeed(&tio, cfgetispeed(&saved_tio));
320: cfsetospeed(&tio, cfgetospeed(&saved_tio));
321: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
322: }
1.1 nicm 323:
1.71 nicm 324: /* Send identify messages. */
1.98 nicm 325: client_send_identify(ttynam, cwd);
1.1 nicm 326:
1.46 nicm 327: /* Send first command. */
328: if (msg == MSG_COMMAND) {
1.70 nicm 329: /* How big is the command? */
330: size = 0;
331: for (i = 0; i < argc; i++)
332: size += strlen(argv[i]) + 1;
333: data = xmalloc((sizeof *data) + size);
1.46 nicm 334:
335: /* Prepare command for server. */
1.70 nicm 336: data->argc = argc;
1.83 nicm 337: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 338: fprintf(stderr, "command too long\n");
1.70 nicm 339: free(data);
1.46 nicm 340: return (1);
341: }
1.70 nicm 342: size += sizeof *data;
1.46 nicm 343:
1.70 nicm 344: /* Send the command. */
1.99 nicm 345: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 346: fprintf(stderr, "failed to send command\n");
347: free(data);
348: return (1);
349: }
350: free(data);
1.46 nicm 351: } else if (msg == MSG_SHELL)
1.99 nicm 352: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 353:
1.99 nicm 354: /* Start main loop. */
355: proc_loop(client_proc, NULL);
1.46 nicm 356:
357: /* Print the exit message, if any, and exit. */
1.48 nicm 358: if (client_attached) {
1.93 nicm 359: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 360: printf("[%s]\n", client_exit_message());
1.48 nicm 361:
362: ppid = getppid();
363: if (client_exittype == MSG_DETACHKILL && ppid > 1)
364: kill(ppid, SIGHUP);
1.93 nicm 365: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 366: if (client_exitreason != CLIENT_EXIT_NONE)
367: printf("%%exit %s\n", client_exit_message());
368: else
369: printf("%%exit\n");
370: printf("\033\\");
1.56 nicm 371: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.109 ! nicm 372: } else
! 373: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 374: setblocking(STDIN_FILENO, 1);
1.46 nicm 375: return (client_exitval);
1.1 nicm 376: }
377:
1.71 nicm 378: /* Send identify messages to server. */
1.11 nicm 379: void
1.98 nicm 380: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 381: {
1.90 nicm 382: const char *s;
1.71 nicm 383: char **ss;
1.91 nicm 384: size_t sslen;
1.93 nicm 385: int fd, flags = client_flags;
1.90 nicm 386: pid_t pid;
1.71 nicm 387:
1.99 nicm 388: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 389:
390: if ((s = getenv("TERM")) == NULL)
391: s = "";
1.99 nicm 392: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 393:
1.107 nicm 394: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
395: strlen(ttynam) + 1);
1.99 nicm 396: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 397:
1.50 nicm 398: if ((fd = dup(STDIN_FILENO)) == -1)
399: fatal("dup failed");
1.99 nicm 400: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 401:
402: pid = getpid();
1.99 nicm 403: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 404:
1.91 nicm 405: for (ss = environ; *ss != NULL; ss++) {
406: sslen = strlen(*ss) + 1;
1.107 nicm 407: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
408: continue;
409: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 410: }
1.75 nicm 411:
1.99 nicm 412: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 413: }
414:
1.54 nicm 415: /* Callback for client stdin read events. */
416: void
1.106 nicm 417: client_stdin_callback(__unused int fd, __unused short events,
418: __unused void *arg)
1.54 nicm 419: {
420: struct msg_stdin_data data;
421:
422: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
423: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
424: return;
425:
1.99 nicm 426: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 427: if (data.size <= 0)
428: event_del(&client_stdin);
429: }
430:
1.57 nicm 431: /* Force write to file descriptor. */
432: void
433: client_write(int fd, const char *data, size_t size)
434: {
435: ssize_t used;
436:
437: while (size != 0) {
438: used = write(fd, data, size);
439: if (used == -1) {
440: if (errno == EINTR || errno == EAGAIN)
441: continue;
442: break;
443: }
444: data += used;
445: size -= used;
446: }
447: }
448:
1.93 nicm 449: /* Run command in shell; used for -c. */
450: __dead void
451: client_exec(const char *shell)
452: {
453: const char *name, *ptr;
454: char *argv0;
455:
456: log_debug("shell %s, command %s", shell, shell_cmd);
457:
458: ptr = strrchr(shell, '/');
459: if (ptr != NULL && *(ptr + 1) != '\0')
460: name = ptr + 1;
461: else
462: name = shell;
463: if (client_flags & CLIENT_LOGIN)
464: xasprintf(&argv0, "-%s", name);
465: else
466: xasprintf(&argv0, "%s", name);
467: setenv("SHELL", shell, 1);
468:
469: setblocking(STDIN_FILENO, 1);
470: setblocking(STDOUT_FILENO, 1);
471: setblocking(STDERR_FILENO, 1);
472: closefrom(STDERR_FILENO + 1);
473:
474: execl(shell, argv0, "-c", shell_cmd, (char *) NULL);
475: fatal("execl failed");
476: }
477:
1.99 nicm 478: /* Callback to handle signals in the client. */
479: void
480: client_signal(int sig)
481: {
482: struct sigaction sigact;
483: int status;
484:
485: if (sig == SIGCHLD)
486: waitpid(WAIT_ANY, &status, WNOHANG);
487: else if (!client_attached) {
488: if (sig == SIGTERM)
489: proc_exit(client_proc);
490: } else {
491: switch (sig) {
492: case SIGHUP:
493: client_exitreason = CLIENT_EXIT_LOST_TTY;
494: client_exitval = 1;
495: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
496: break;
497: case SIGTERM:
498: client_exitreason = CLIENT_EXIT_TERMINATED;
499: client_exitval = 1;
500: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
501: break;
502: case SIGWINCH:
503: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
504: break;
505: case SIGCONT:
506: memset(&sigact, 0, sizeof sigact);
507: sigemptyset(&sigact.sa_mask);
508: sigact.sa_flags = SA_RESTART;
509: sigact.sa_handler = SIG_IGN;
510: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
511: fatal("sigaction failed");
512: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
513: break;
514: }
515: }
516: }
517:
518: /* Callback for client read events. */
519: void
1.106 nicm 520: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 521: {
522: if (imsg == NULL) {
523: client_exitreason = CLIENT_EXIT_LOST_SERVER;
524: client_exitval = 1;
1.109 ! nicm 525: proc_exit(client_proc);
! 526: return;
! 527: }
! 528:
! 529: if (client_attached)
1.99 nicm 530: client_dispatch_attached(imsg);
531: else
532: client_dispatch_wait(imsg);
533: }
534:
1.46 nicm 535: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.99 nicm 536: void
537: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 538: {
1.69 nicm 539: char *data;
1.99 nicm 540: ssize_t datalen;
1.69 nicm 541: struct msg_stdout_data stdoutdata;
542: struct msg_stderr_data stderrdata;
543: int retval;
1.97 nicm 544: static int pledge_applied;
545:
546: /*
547: * "sendfd" is no longer required once all of the identify messages
548: * have been sent. We know the server won't send us anything until that
549: * point (because we don't ask it to), so we can drop "sendfd" once we
550: * get the first message from the server.
551: */
552: if (!pledge_applied) {
1.105 nicm 553: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 554: fatal("pledge failed");
555: pledge_applied = 1;
556: };
1.46 nicm 557:
1.99 nicm 558: data = imsg->data;
559: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 560:
1.99 nicm 561: switch (imsg->hdr.type) {
562: case MSG_EXIT:
563: case MSG_SHUTDOWN:
564: if (datalen != sizeof retval && datalen != 0)
565: fatalx("bad MSG_EXIT size");
566: if (datalen == sizeof retval) {
567: memcpy(&retval, data, sizeof retval);
568: client_exitval = retval;
569: }
570: proc_exit(client_proc);
571: break;
572: case MSG_READY:
573: if (datalen != 0)
574: fatalx("bad MSG_READY size");
1.54 nicm 575:
1.99 nicm 576: event_del(&client_stdin);
577: client_attached = 1;
578: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
579: break;
580: case MSG_STDIN:
581: if (datalen != 0)
582: fatalx("bad MSG_STDIN size");
1.54 nicm 583:
1.99 nicm 584: event_add(&client_stdin, NULL);
585: break;
586: case MSG_STDOUT:
587: if (datalen != sizeof stdoutdata)
588: fatalx("bad MSG_STDOUT size");
589: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 590:
1.99 nicm 591: client_write(STDOUT_FILENO, stdoutdata.data,
592: stdoutdata.size);
593: break;
594: case MSG_STDERR:
595: if (datalen != sizeof stderrdata)
596: fatalx("bad MSG_STDERR size");
597: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 598:
1.99 nicm 599: client_write(STDERR_FILENO, stderrdata.data,
600: stderrdata.size);
601: break;
602: case MSG_VERSION:
603: if (datalen != 0)
604: fatalx("bad MSG_VERSION size");
605:
606: fprintf(stderr, "protocol version mismatch "
607: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 608: imsg->hdr.peerid & 0xff);
1.99 nicm 609: client_exitval = 1;
610: proc_exit(client_proc);
611: break;
612: case MSG_SHELL:
613: if (datalen == 0 || data[datalen - 1] != '\0')
614: fatalx("bad MSG_SHELL string");
615:
616: clear_signals(0);
617: client_exec(data);
618: /* NOTREACHED */
619: case MSG_DETACH:
620: case MSG_DETACHKILL:
621: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
622: break;
623: case MSG_EXITED:
624: proc_exit(client_proc);
625: break;
1.46 nicm 626: }
627: }
628:
629: /* Dispatch imsgs in attached state (after MSG_READY). */
1.99 nicm 630: void
631: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 632: {
1.69 nicm 633: struct sigaction sigact;
634: char *data;
1.99 nicm 635: ssize_t datalen;
1.9 nicm 636:
1.99 nicm 637: data = imsg->data;
638: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 639:
1.99 nicm 640: switch (imsg->hdr.type) {
641: case MSG_DETACH:
642: case MSG_DETACHKILL:
643: if (datalen == 0 || data[datalen - 1] != '\0')
644: fatalx("bad MSG_DETACH string");
645:
646: client_exitsession = xstrdup(data);
647: client_exittype = imsg->hdr.type;
648: if (imsg->hdr.type == MSG_DETACHKILL)
649: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
650: else
651: client_exitreason = CLIENT_EXIT_DETACHED;
652: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
653: break;
654: case MSG_EXIT:
655: if (datalen != 0 && datalen != sizeof (int))
656: fatalx("bad MSG_EXIT size");
1.9 nicm 657:
1.99 nicm 658: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
659: client_exitreason = CLIENT_EXIT_EXITED;
660: break;
661: case MSG_EXITED:
662: if (datalen != 0)
663: fatalx("bad MSG_EXITED size");
1.9 nicm 664:
1.99 nicm 665: proc_exit(client_proc);
666: break;
667: case MSG_SHUTDOWN:
668: if (datalen != 0)
669: fatalx("bad MSG_SHUTDOWN size");
670:
671: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
672: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
673: client_exitval = 1;
674: break;
675: case MSG_SUSPEND:
676: if (datalen != 0)
677: fatalx("bad MSG_SUSPEND size");
678:
679: memset(&sigact, 0, sizeof sigact);
680: sigemptyset(&sigact.sa_mask);
681: sigact.sa_flags = SA_RESTART;
682: sigact.sa_handler = SIG_DFL;
683: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
684: fatal("sigaction failed");
685: kill(getpid(), SIGTSTP);
686: break;
687: case MSG_LOCK:
688: if (datalen == 0 || data[datalen - 1] != '\0')
689: fatalx("bad MSG_LOCK string");
1.9 nicm 690:
1.99 nicm 691: system(data);
692: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
693: break;
1.9 nicm 694: }
1.1 nicm 695: }
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