Annotation of src/usr.bin/tmux/client.c, Revision 1.118
1.118 ! nicm 1: /* $OpenBSD: client.c,v 1.117 2017/01/16 14:52:25 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. */
1.100 nicm 306: options_free(global_options);
307: options_free(global_s_options);
308: options_free(global_w_options);
1.101 nicm 309: environ_free(global_environ);
1.46 nicm 310:
1.54 nicm 311: /* Create stdin handler. */
312: setblocking(STDIN_FILENO, 0);
313: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
314: client_stdin_callback, NULL);
1.93 nicm 315: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 ! nicm 316: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
! 317: fprintf(stderr, "tcgetattr failed: %s\n",
! 318: strerror(errno));
! 319: return (1);
! 320: }
1.56 nicm 321: cfmakeraw(&tio);
322: tio.c_iflag = ICRNL|IXANY;
323: tio.c_oflag = OPOST|ONLCR;
324: tio.c_lflag = NOKERNINFO;
325: tio.c_cflag = CREAD|CS8|HUPCL;
326: tio.c_cc[VMIN] = 1;
327: tio.c_cc[VTIME] = 0;
328: cfsetispeed(&tio, cfgetispeed(&saved_tio));
329: cfsetospeed(&tio, cfgetospeed(&saved_tio));
330: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
331: }
1.1 nicm 332:
1.71 nicm 333: /* Send identify messages. */
1.98 nicm 334: client_send_identify(ttynam, cwd);
1.1 nicm 335:
1.46 nicm 336: /* Send first command. */
337: if (msg == MSG_COMMAND) {
1.70 nicm 338: /* How big is the command? */
339: size = 0;
340: for (i = 0; i < argc; i++)
341: size += strlen(argv[i]) + 1;
342: data = xmalloc((sizeof *data) + size);
1.46 nicm 343:
344: /* Prepare command for server. */
1.70 nicm 345: data->argc = argc;
1.83 nicm 346: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 347: fprintf(stderr, "command too long\n");
1.70 nicm 348: free(data);
1.46 nicm 349: return (1);
350: }
1.70 nicm 351: size += sizeof *data;
1.46 nicm 352:
1.70 nicm 353: /* Send the command. */
1.99 nicm 354: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 355: fprintf(stderr, "failed to send command\n");
356: free(data);
357: return (1);
358: }
359: free(data);
1.46 nicm 360: } else if (msg == MSG_SHELL)
1.99 nicm 361: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 362:
1.99 nicm 363: /* Start main loop. */
364: proc_loop(client_proc, NULL);
1.46 nicm 365:
1.115 nicm 366: /* Run command if user requested exec, instead of exiting. */
367: if (client_exittype == MSG_EXEC) {
368: if (client_flags & CLIENT_CONTROLCONTROL)
369: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
370: clear_signals(0);
371: client_exec(client_execshell, client_execcmd);
372: }
373:
1.46 nicm 374: /* Print the exit message, if any, and exit. */
1.48 nicm 375: if (client_attached) {
1.93 nicm 376: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 377: printf("[%s]\n", client_exit_message());
1.48 nicm 378:
379: ppid = getppid();
380: if (client_exittype == MSG_DETACHKILL && ppid > 1)
381: kill(ppid, SIGHUP);
1.93 nicm 382: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 383: if (client_exitreason != CLIENT_EXIT_NONE)
384: printf("%%exit %s\n", client_exit_message());
385: else
386: printf("%%exit\n");
387: printf("\033\\");
1.56 nicm 388: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 389: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 390: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 391: setblocking(STDIN_FILENO, 1);
1.46 nicm 392: return (client_exitval);
1.1 nicm 393: }
394:
1.71 nicm 395: /* Send identify messages to server. */
1.114 nicm 396: static void
1.98 nicm 397: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 398: {
1.90 nicm 399: const char *s;
1.71 nicm 400: char **ss;
1.91 nicm 401: size_t sslen;
1.93 nicm 402: int fd, flags = client_flags;
1.90 nicm 403: pid_t pid;
1.71 nicm 404:
1.99 nicm 405: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 406:
407: if ((s = getenv("TERM")) == NULL)
408: s = "";
1.99 nicm 409: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 410:
1.107 nicm 411: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
412: strlen(ttynam) + 1);
1.99 nicm 413: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 414:
1.50 nicm 415: if ((fd = dup(STDIN_FILENO)) == -1)
416: fatal("dup failed");
1.99 nicm 417: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 418:
419: pid = getpid();
1.99 nicm 420: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 421:
1.91 nicm 422: for (ss = environ; *ss != NULL; ss++) {
423: sslen = strlen(*ss) + 1;
1.107 nicm 424: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
425: continue;
426: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 427: }
1.75 nicm 428:
1.99 nicm 429: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 430: }
431:
1.54 nicm 432: /* Callback for client stdin read events. */
1.114 nicm 433: static void
1.106 nicm 434: client_stdin_callback(__unused int fd, __unused short events,
435: __unused void *arg)
1.54 nicm 436: {
437: struct msg_stdin_data data;
438:
439: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
440: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
441: return;
442:
1.99 nicm 443: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
1.54 nicm 444: if (data.size <= 0)
445: event_del(&client_stdin);
446: }
447:
1.57 nicm 448: /* Force write to file descriptor. */
1.114 nicm 449: static void
1.57 nicm 450: client_write(int fd, const char *data, size_t size)
451: {
452: ssize_t used;
453:
454: while (size != 0) {
455: used = write(fd, data, size);
456: if (used == -1) {
457: if (errno == EINTR || errno == EAGAIN)
458: continue;
459: break;
460: }
461: data += used;
462: size -= used;
463: }
464: }
465:
1.93 nicm 466: /* Run command in shell; used for -c. */
1.114 nicm 467: static __dead void
1.111 nicm 468: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 469: {
470: const char *name, *ptr;
471: char *argv0;
472:
1.111 nicm 473: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 474:
475: ptr = strrchr(shell, '/');
476: if (ptr != NULL && *(ptr + 1) != '\0')
477: name = ptr + 1;
478: else
479: name = shell;
480: if (client_flags & CLIENT_LOGIN)
481: xasprintf(&argv0, "-%s", name);
482: else
483: xasprintf(&argv0, "%s", name);
484: setenv("SHELL", shell, 1);
485:
486: setblocking(STDIN_FILENO, 1);
487: setblocking(STDOUT_FILENO, 1);
488: setblocking(STDERR_FILENO, 1);
489: closefrom(STDERR_FILENO + 1);
490:
1.111 nicm 491: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 492: fatal("execl failed");
493: }
494:
1.99 nicm 495: /* Callback to handle signals in the client. */
1.114 nicm 496: static void
1.99 nicm 497: client_signal(int sig)
498: {
499: struct sigaction sigact;
500: int status;
501:
502: if (sig == SIGCHLD)
503: waitpid(WAIT_ANY, &status, WNOHANG);
504: else if (!client_attached) {
505: if (sig == SIGTERM)
506: proc_exit(client_proc);
507: } else {
508: switch (sig) {
509: case SIGHUP:
510: client_exitreason = CLIENT_EXIT_LOST_TTY;
511: client_exitval = 1;
512: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
513: break;
514: case SIGTERM:
515: client_exitreason = CLIENT_EXIT_TERMINATED;
516: client_exitval = 1;
517: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
518: break;
519: case SIGWINCH:
520: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
521: break;
522: case SIGCONT:
523: memset(&sigact, 0, sizeof sigact);
524: sigemptyset(&sigact.sa_mask);
525: sigact.sa_flags = SA_RESTART;
526: sigact.sa_handler = SIG_IGN;
527: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
528: fatal("sigaction failed");
529: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
530: break;
531: }
532: }
533: }
534:
535: /* Callback for client read events. */
1.114 nicm 536: static void
1.111 nicm 537: client_dispatch(struct imsg *imsg, void *arg)
1.99 nicm 538: {
539: if (imsg == NULL) {
540: client_exitreason = CLIENT_EXIT_LOST_SERVER;
541: client_exitval = 1;
1.109 nicm 542: proc_exit(client_proc);
543: return;
544: }
545:
546: if (client_attached)
1.99 nicm 547: client_dispatch_attached(imsg);
548: else
1.111 nicm 549: client_dispatch_wait(imsg, arg);
1.99 nicm 550: }
551:
1.46 nicm 552: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 553: static void
1.111 nicm 554: client_dispatch_wait(struct imsg *imsg, const char *shellcmd)
1.46 nicm 555: {
1.69 nicm 556: char *data;
1.99 nicm 557: ssize_t datalen;
1.69 nicm 558: struct msg_stdout_data stdoutdata;
559: struct msg_stderr_data stderrdata;
560: int retval;
1.97 nicm 561: static int pledge_applied;
562:
563: /*
564: * "sendfd" is no longer required once all of the identify messages
565: * have been sent. We know the server won't send us anything until that
566: * point (because we don't ask it to), so we can drop "sendfd" once we
567: * get the first message from the server.
568: */
569: if (!pledge_applied) {
1.105 nicm 570: if (pledge("stdio unix proc exec tty", NULL) != 0)
1.97 nicm 571: fatal("pledge failed");
572: pledge_applied = 1;
573: };
1.46 nicm 574:
1.99 nicm 575: data = imsg->data;
576: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 577:
1.99 nicm 578: switch (imsg->hdr.type) {
579: case MSG_EXIT:
580: case MSG_SHUTDOWN:
581: if (datalen != sizeof retval && datalen != 0)
582: fatalx("bad MSG_EXIT size");
583: if (datalen == sizeof retval) {
584: memcpy(&retval, data, sizeof retval);
585: client_exitval = retval;
586: }
587: proc_exit(client_proc);
588: break;
589: case MSG_READY:
590: if (datalen != 0)
591: fatalx("bad MSG_READY size");
1.54 nicm 592:
1.99 nicm 593: event_del(&client_stdin);
594: client_attached = 1;
595: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
596: break;
597: case MSG_STDIN:
598: if (datalen != 0)
599: fatalx("bad MSG_STDIN size");
1.54 nicm 600:
1.99 nicm 601: event_add(&client_stdin, NULL);
602: break;
603: case MSG_STDOUT:
604: if (datalen != sizeof stdoutdata)
605: fatalx("bad MSG_STDOUT size");
606: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.46 nicm 607:
1.99 nicm 608: client_write(STDOUT_FILENO, stdoutdata.data,
609: stdoutdata.size);
610: break;
611: case MSG_STDERR:
612: if (datalen != sizeof stderrdata)
613: fatalx("bad MSG_STDERR size");
614: memcpy(&stderrdata, data, sizeof stderrdata);
1.46 nicm 615:
1.99 nicm 616: client_write(STDERR_FILENO, stderrdata.data,
617: stderrdata.size);
618: break;
619: case MSG_VERSION:
620: if (datalen != 0)
621: fatalx("bad MSG_VERSION size");
622:
623: fprintf(stderr, "protocol version mismatch "
624: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 625: imsg->hdr.peerid & 0xff);
1.99 nicm 626: client_exitval = 1;
627: proc_exit(client_proc);
628: break;
629: case MSG_SHELL:
630: if (datalen == 0 || data[datalen - 1] != '\0')
631: fatalx("bad MSG_SHELL string");
632:
633: clear_signals(0);
1.111 nicm 634: client_exec(data, shellcmd);
1.99 nicm 635: /* NOTREACHED */
636: case MSG_DETACH:
637: case MSG_DETACHKILL:
638: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
639: break;
640: case MSG_EXITED:
641: proc_exit(client_proc);
642: break;
1.46 nicm 643: }
644: }
645:
646: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 647: static void
1.99 nicm 648: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 649: {
1.69 nicm 650: struct sigaction sigact;
651: char *data;
1.99 nicm 652: ssize_t datalen;
1.9 nicm 653:
1.99 nicm 654: data = imsg->data;
655: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 656:
1.99 nicm 657: switch (imsg->hdr.type) {
658: case MSG_DETACH:
659: case MSG_DETACHKILL:
660: if (datalen == 0 || data[datalen - 1] != '\0')
661: fatalx("bad MSG_DETACH string");
662:
663: client_exitsession = xstrdup(data);
664: client_exittype = imsg->hdr.type;
665: if (imsg->hdr.type == MSG_DETACHKILL)
666: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
667: else
668: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 669: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
670: break;
671: case MSG_EXEC:
672: if (datalen == 0 || data[datalen - 1] != '\0' ||
673: strlen(data) + 1 == (size_t)datalen)
674: fatalx("bad MSG_EXEC string");
675: client_execcmd = xstrdup(data);
676: client_execshell = xstrdup(data + strlen(data) + 1);
677:
678: client_exittype = imsg->hdr.type;
1.99 nicm 679: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
680: break;
681: case MSG_EXIT:
682: if (datalen != 0 && datalen != sizeof (int))
683: fatalx("bad MSG_EXIT size");
1.9 nicm 684:
1.99 nicm 685: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
686: client_exitreason = CLIENT_EXIT_EXITED;
687: break;
688: case MSG_EXITED:
689: if (datalen != 0)
690: fatalx("bad MSG_EXITED size");
1.9 nicm 691:
1.99 nicm 692: proc_exit(client_proc);
693: break;
694: case MSG_SHUTDOWN:
695: if (datalen != 0)
696: fatalx("bad MSG_SHUTDOWN size");
697:
698: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
699: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
700: client_exitval = 1;
701: break;
702: case MSG_SUSPEND:
703: if (datalen != 0)
704: fatalx("bad MSG_SUSPEND size");
705:
706: memset(&sigact, 0, sizeof sigact);
707: sigemptyset(&sigact.sa_mask);
708: sigact.sa_flags = SA_RESTART;
709: sigact.sa_handler = SIG_DFL;
710: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
711: fatal("sigaction failed");
712: kill(getpid(), SIGTSTP);
713: break;
714: case MSG_LOCK:
715: if (datalen == 0 || data[datalen - 1] != '\0')
716: fatalx("bad MSG_LOCK string");
1.9 nicm 717:
1.99 nicm 718: system(data);
719: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
720: break;
1.9 nicm 721: }
1.1 nicm 722: }