Annotation of src/usr.bin/tmux/client.c, Revision 1.88
1.88 ! nicm 1: /* $OpenBSD: client.c,v 1.87 2015/04/21 22:21:41 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>
1.85 nicm 29: #include <signal.h>
1.1 nicm 30: #include <stdlib.h>
31: #include <string.h>
32: #include <unistd.h>
33:
34: #include "tmux.h"
35:
1.25 nicm 36: struct imsgbuf client_ibuf;
1.30 nicm 37: struct event client_event;
1.54 nicm 38: struct event client_stdin;
1.52 nicm 39: enum {
40: CLIENT_EXIT_NONE,
41: CLIENT_EXIT_DETACHED,
42: CLIENT_EXIT_DETACHED_HUP,
43: CLIENT_EXIT_LOST_TTY,
44: CLIENT_EXIT_TERMINATED,
45: CLIENT_EXIT_LOST_SERVER,
46: CLIENT_EXIT_EXITED,
47: CLIENT_EXIT_SERVER_EXITED,
48: } client_exitreason = CLIENT_EXIT_NONE;
1.32 nicm 49: int client_exitval;
1.48 nicm 50: enum msgtype client_exittype;
1.73 nicm 51: const char *client_exitsession;
1.46 nicm 52: int client_attached;
1.1 nicm 53:
1.49 nicm 54: int client_get_lock(char *);
1.46 nicm 55: int client_connect(char *, int);
1.30 nicm 56: void client_send_identify(int);
1.70 nicm 57: int client_write_one(enum msgtype, int, const void *, size_t);
58: int client_write_server(enum msgtype, const void *, size_t);
1.31 nicm 59: void client_update_event(void);
1.30 nicm 60: void client_signal(int, short, void *);
1.54 nicm 61: void client_stdin_callback(int, short, void *);
1.57 nicm 62: void client_write(int, const char *, size_t);
1.30 nicm 63: void client_callback(int, short, void *);
1.46 nicm 64: int client_dispatch_attached(void);
65: int client_dispatch_wait(void *);
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:
79: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1)
80: fatal("open failed");
1.82 nicm 81: log_debug("lock file is %s", lockfile);
1.49 nicm 82:
1.82 nicm 83: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
84: log_debug("flock failed: %s", strerror(errno));
85: if (errno != EAGAIN)
86: return (lockfd);
87: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 88: /* nothing */;
89: close(lockfd);
90: return (-1);
91: }
1.82 nicm 92: log_debug("flock succeeded");
1.49 nicm 93:
94: return (lockfd);
95: }
96:
1.46 nicm 97: /* Connect client to server. */
98: int
99: client_connect(char *path, int start_server)
1.1 nicm 100: {
1.26 nicm 101: struct sockaddr_un sa;
102: size_t size;
1.82 nicm 103: int fd, lockfd = -1, locked = 0;
104: char *lockfile = NULL;
1.1 nicm 105:
106: memset(&sa, 0, sizeof sa);
107: sa.sun_family = AF_UNIX;
108: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
109: if (size >= sizeof sa.sun_path) {
110: errno = ENAMETOOLONG;
1.46 nicm 111: return (-1);
1.1 nicm 112: }
1.82 nicm 113: log_debug("socket is %s", path);
1.1 nicm 114:
1.49 nicm 115: retry:
1.10 nicm 116: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 117: fatal("socket failed");
1.1 nicm 118:
1.82 nicm 119: log_debug("trying connect");
1.10 nicm 120: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.82 nicm 121: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 122: if (errno != ECONNREFUSED && errno != ENOENT)
123: goto failed;
1.46 nicm 124: if (!start_server)
125: goto failed;
1.49 nicm 126: close(fd);
127:
1.82 nicm 128: if (!locked) {
129: xasprintf(&lockfile, "%s.lock", path);
130: if ((lockfd = client_get_lock(lockfile)) == -1) {
131: log_debug("didn't get lock");
132: free(lockfile);
133: goto retry;
134: }
135: log_debug("got lock");
136:
137: /*
138: * Always retry at least once, even if we got the lock,
139: * because another client could have taken the lock,
140: * started the server and released the lock between our
141: * connect() and flock().
142: */
143: locked = 1;
1.49 nicm 144: goto retry;
1.78 nicm 145: }
1.82 nicm 146:
1.78 nicm 147: if (unlink(path) != 0 && errno != ENOENT) {
148: free(lockfile);
149: close(lockfd);
1.49 nicm 150: return (-1);
1.78 nicm 151: }
1.49 nicm 152: fd = server_start(lockfd, lockfile);
1.82 nicm 153: }
154: if (locked) {
1.58 nicm 155: free(lockfile);
1.49 nicm 156: close(lockfd);
1.1 nicm 157: }
158:
1.47 nicm 159: setblocking(fd, 0);
1.46 nicm 160: return (fd);
161:
162: failed:
163: close(fd);
164: return (-1);
165: }
166:
1.52 nicm 167: /* Get exit string from reason number. */
168: const char *
169: client_exit_message(void)
170: {
1.73 nicm 171: static char msg[256];
172:
1.52 nicm 173: switch (client_exitreason) {
174: case CLIENT_EXIT_NONE:
175: break;
176: case CLIENT_EXIT_DETACHED:
1.73 nicm 177: if (client_exitsession != NULL) {
178: xsnprintf(msg, sizeof msg, "detached "
179: "(from session %s)", client_exitsession);
180: return (msg);
181: }
1.52 nicm 182: return ("detached");
183: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 184: if (client_exitsession != NULL) {
185: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
186: "(from session %s)", client_exitsession);
187: return (msg);
188: }
1.52 nicm 189: return ("detached and SIGHUP");
190: case CLIENT_EXIT_LOST_TTY:
191: return ("lost tty");
192: case CLIENT_EXIT_TERMINATED:
193: return ("terminated");
194: case CLIENT_EXIT_LOST_SERVER:
195: return ("lost server");
196: case CLIENT_EXIT_EXITED:
197: return ("exited");
198: case CLIENT_EXIT_SERVER_EXITED:
199: return ("server exited");
200: }
201: return ("unknown reason");
202: }
203:
1.46 nicm 204: /* Client main loop. */
205: int
206: client_main(int argc, char **argv, int flags)
207: {
208: struct cmd *cmd;
209: struct cmd_list *cmdlist;
1.70 nicm 210: struct msg_command_data *data;
211: int cmdflags, fd, i;
1.48 nicm 212: pid_t ppid;
1.46 nicm 213: enum msgtype msg;
214: char *cause;
1.56 nicm 215: struct termios tio, saved_tio;
1.70 nicm 216: size_t size;
1.46 nicm 217:
218: /* Set up the initial command. */
219: cmdflags = 0;
220: if (shell_cmd != NULL) {
221: msg = MSG_SHELL;
222: cmdflags = CMD_STARTSERVER;
223: } else if (argc == 0) {
224: msg = MSG_COMMAND;
1.67 nicm 225: cmdflags = CMD_STARTSERVER|CMD_CANTNEST;
1.46 nicm 226: } else {
227: msg = MSG_COMMAND;
228:
229: /*
230: * It sucks parsing the command string twice (in client and
231: * later in server) but it is necessary to get the start server
232: * flag.
233: */
1.62 nicm 234: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
235: if (cmdlist == NULL) {
1.59 nicm 236: fprintf(stderr, "%s\n", cause);
1.46 nicm 237: return (1);
238: }
239: cmdflags &= ~CMD_STARTSERVER;
240: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
241: if (cmd->entry->flags & CMD_STARTSERVER)
242: cmdflags |= CMD_STARTSERVER;
243: if (cmd->entry->flags & CMD_CANTNEST)
244: cmdflags |= CMD_CANTNEST;
245: }
246: cmd_list_free(cmdlist);
247: }
248:
249: /*
250: * Check if this could be a nested session, if the command can't nest:
251: * if the socket path matches $TMUX, this is probably the same server.
252: */
253: if (shell_cmd == NULL && environ_path != NULL &&
1.52 nicm 254: (cmdflags & CMD_CANTNEST) &&
255: strcmp(socket_path, environ_path) == 0) {
1.55 nicm 256: fprintf(stderr, "sessions should be nested with care, "
257: "unset $TMUX to force\n");
1.46 nicm 258: return (1);
259: }
260:
1.82 nicm 261: /* Set process title, log and signals now this is the client. */
262: setproctitle("client (%s)", socket_path);
263: logfile("client");
264:
1.88 ! nicm 265: /* Establish signal handlers. */
! 266: set_signals(client_signal);
! 267:
1.82 nicm 268: /* Initialize the client socket and start the server. */
1.46 nicm 269: fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
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: }
280:
281: /* Create imsg. */
1.25 nicm 282: imsg_init(&client_ibuf, fd);
1.46 nicm 283: event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
284:
1.54 nicm 285: /* Create stdin handler. */
286: setblocking(STDIN_FILENO, 0);
287: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
288: client_stdin_callback, NULL);
1.68 nicm 289: if (flags & CLIENT_CONTROLCONTROL) {
1.56 nicm 290: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
291: fprintf(stderr, "tcgetattr failed: %s\n",
292: strerror(errno));
293: return (1);
294: }
295: cfmakeraw(&tio);
296: tio.c_iflag = ICRNL|IXANY;
297: tio.c_oflag = OPOST|ONLCR;
298: tio.c_lflag = NOKERNINFO;
299: tio.c_cflag = CREAD|CS8|HUPCL;
300: tio.c_cc[VMIN] = 1;
301: tio.c_cc[VTIME] = 0;
302: cfsetispeed(&tio, cfgetispeed(&saved_tio));
303: cfsetospeed(&tio, cfgetospeed(&saved_tio));
304: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
305: }
1.1 nicm 306:
1.71 nicm 307: /* Send identify messages. */
1.42 nicm 308: client_send_identify(flags);
1.1 nicm 309:
1.46 nicm 310: /* Send first command. */
311: if (msg == MSG_COMMAND) {
1.70 nicm 312: /* How big is the command? */
313: size = 0;
314: for (i = 0; i < argc; i++)
315: size += strlen(argv[i]) + 1;
316: data = xmalloc((sizeof *data) + size);
1.46 nicm 317:
318: /* Prepare command for server. */
1.70 nicm 319: data->argc = argc;
1.83 nicm 320: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 321: fprintf(stderr, "command too long\n");
1.70 nicm 322: free(data);
1.46 nicm 323: return (1);
324: }
1.70 nicm 325: size += sizeof *data;
1.46 nicm 326:
1.70 nicm 327: /* Send the command. */
328: if (client_write_server(msg, data, size) != 0) {
329: fprintf(stderr, "failed to send command\n");
330: free(data);
331: return (1);
332: }
333: free(data);
1.46 nicm 334: } else if (msg == MSG_SHELL)
335: client_write_server(msg, NULL, 0);
1.1 nicm 336:
1.46 nicm 337: /* Set the event and dispatch. */
338: client_update_event();
339: event_dispatch();
340:
341: /* Print the exit message, if any, and exit. */
1.48 nicm 342: if (client_attached) {
1.52 nicm 343: if (client_exitreason != CLIENT_EXIT_NONE && !login_shell)
344: printf("[%s]\n", client_exit_message());
1.48 nicm 345:
346: ppid = getppid();
347: if (client_exittype == MSG_DETACHKILL && ppid > 1)
348: kill(ppid, SIGHUP);
1.68 nicm 349: } else if (flags & CLIENT_CONTROLCONTROL) {
350: if (client_exitreason != CLIENT_EXIT_NONE)
351: printf("%%exit %s\n", client_exit_message());
352: else
353: printf("%%exit\n");
354: printf("\033\\");
1.56 nicm 355: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.63 nicm 356: }
1.54 nicm 357: setblocking(STDIN_FILENO, 1);
1.46 nicm 358: return (client_exitval);
1.1 nicm 359: }
360:
1.71 nicm 361: /* Send identify messages to server. */
1.11 nicm 362: void
1.26 nicm 363: client_send_identify(int flags)
364: {
1.71 nicm 365: const char *s;
366: char **ss;
367: int fd;
368:
369: client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
370:
371: if ((s = getenv("TERM")) == NULL)
372: s = "";
373: client_write_one(MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
374:
375: if ((s = ttyname(STDIN_FILENO)) == NULL)
376: s = "";
377: client_write_one(MSG_IDENTIFY_TTYNAME, -1, s, strlen(s) + 1);
378:
379: if ((fd = open(".", O_RDONLY)) == -1)
380: fd = open("/", O_RDONLY);
381: client_write_one(MSG_IDENTIFY_CWD, fd, NULL, 0);
1.26 nicm 382:
1.50 nicm 383: if ((fd = dup(STDIN_FILENO)) == -1)
384: fatal("dup failed");
1.71 nicm 385: client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.26 nicm 386:
1.71 nicm 387: for (ss = environ; *ss != NULL; ss++)
388: client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, strlen(*ss) + 1);
1.75 nicm 389:
1.71 nicm 390: client_write_one(MSG_IDENTIFY_DONE, -1, NULL, 0);
1.11 nicm 391:
1.71 nicm 392: client_update_event();
1.11 nicm 393: }
394:
1.70 nicm 395: /* Helper to send one message. */
396: int
397: client_write_one(enum msgtype type, int fd, const void *buf, size_t len)
398: {
399: int retval;
400:
401: retval = imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, fd,
1.83 nicm 402: (void *)buf, len);
1.70 nicm 403: if (retval != 1)
404: return (-1);
405: return (0);
406: }
407:
1.46 nicm 408: /* Write a message to the server without a file descriptor. */
1.70 nicm 409: int
410: client_write_server(enum msgtype type, const void *buf, size_t len)
1.25 nicm 411: {
1.70 nicm 412: int retval;
413:
414: retval = client_write_one(type, -1, buf, len);
415: if (retval == 0)
416: client_update_event();
417: return (retval);
1.25 nicm 418: }
419:
1.46 nicm 420: /* Update client event based on whether it needs to read or read and write. */
1.31 nicm 421: void
422: client_update_event(void)
423: {
424: short events;
425:
426: event_del(&client_event);
427: events = EV_READ;
428: if (client_ibuf.w.queued > 0)
429: events |= EV_WRITE;
1.46 nicm 430: event_set(
431: &client_event, client_ibuf.fd, events, client_callback, shell_cmd);
1.31 nicm 432: event_add(&client_event, NULL);
433: }
434:
1.46 nicm 435: /* Callback to handle signals in the client. */
1.30 nicm 436: void
1.31 nicm 437: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 438: {
1.46 nicm 439: struct sigaction sigact;
440: int status;
1.30 nicm 441:
1.84 nicm 442: if (sig == SIGCHLD)
443: waitpid(WAIT_ANY, &status, WNOHANG);
444: else if (!client_attached) {
445: if (sig == SIGTERM)
1.46 nicm 446: event_loopexit(NULL);
447: } else {
448: switch (sig) {
449: case SIGHUP:
1.52 nicm 450: client_exitreason = CLIENT_EXIT_LOST_TTY;
1.46 nicm 451: client_exitval = 1;
452: client_write_server(MSG_EXITING, NULL, 0);
453: break;
454: case SIGTERM:
1.52 nicm 455: client_exitreason = CLIENT_EXIT_TERMINATED;
1.46 nicm 456: client_exitval = 1;
457: client_write_server(MSG_EXITING, NULL, 0);
458: break;
459: case SIGWINCH:
460: client_write_server(MSG_RESIZE, NULL, 0);
461: break;
462: case SIGCONT:
463: memset(&sigact, 0, sizeof sigact);
464: sigemptyset(&sigact.sa_mask);
465: sigact.sa_flags = SA_RESTART;
466: sigact.sa_handler = SIG_IGN;
467: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
468: fatal("sigaction failed");
469: client_write_server(MSG_WAKEUP, NULL, 0);
470: break;
471: }
1.30 nicm 472: }
473:
1.31 nicm 474: client_update_event();
1.30 nicm 475: }
476:
1.46 nicm 477: /* Callback for client imsg read events. */
1.30 nicm 478: void
1.46 nicm 479: client_callback(unused int fd, short events, void *data)
1.30 nicm 480: {
1.33 nicm 481: ssize_t n;
1.46 nicm 482: int retval;
1.30 nicm 483:
484: if (events & EV_READ) {
485: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
486: goto lost_server;
1.46 nicm 487: if (client_attached)
488: retval = client_dispatch_attached();
489: else
490: retval = client_dispatch_wait(data);
491: if (retval != 0) {
1.30 nicm 492: event_loopexit(NULL);
493: return;
1.35 nicm 494: }
1.30 nicm 495: }
1.35 nicm 496:
1.30 nicm 497: if (events & EV_WRITE) {
1.81 krw 498: if (msgbuf_write(&client_ibuf.w) <= 0 && errno != EAGAIN)
1.30 nicm 499: goto lost_server;
500: }
501:
1.31 nicm 502: client_update_event();
1.30 nicm 503: return;
504:
505: lost_server:
1.52 nicm 506: client_exitreason = CLIENT_EXIT_LOST_SERVER;
1.32 nicm 507: client_exitval = 1;
1.30 nicm 508: event_loopexit(NULL);
509: }
510:
1.54 nicm 511: /* Callback for client stdin read events. */
512: void
513: client_stdin_callback(unused int fd, unused short events, unused void *data1)
514: {
515: struct msg_stdin_data data;
516:
517: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
518: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
519: return;
520:
521: client_write_server(MSG_STDIN, &data, sizeof data);
522: if (data.size <= 0)
523: event_del(&client_stdin);
524: client_update_event();
525: }
526:
1.57 nicm 527: /* Force write to file descriptor. */
528: void
529: client_write(int fd, const char *data, size_t size)
530: {
531: ssize_t used;
532:
533: while (size != 0) {
534: used = write(fd, data, size);
535: if (used == -1) {
536: if (errno == EINTR || errno == EAGAIN)
537: continue;
538: break;
539: }
540: data += used;
541: size -= used;
542: }
543: }
544:
1.46 nicm 545: /* Dispatch imsgs when in wait state (before MSG_READY). */
546: int
1.69 nicm 547: client_dispatch_wait(void *data0)
1.46 nicm 548: {
1.69 nicm 549: struct imsg imsg;
550: char *data;
551: ssize_t n, datalen;
552: struct msg_stdout_data stdoutdata;
553: struct msg_stderr_data stderrdata;
554: int retval;
1.46 nicm 555:
556: for (;;) {
557: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
558: fatalx("imsg_get failed");
559: if (n == 0)
560: return (0);
1.69 nicm 561:
562: data = imsg.data;
1.46 nicm 563: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
564:
1.86 nicm 565: log_debug("got %u from server", imsg.hdr.type);
1.46 nicm 566: switch (imsg.hdr.type) {
567: case MSG_EXIT:
568: case MSG_SHUTDOWN:
1.69 nicm 569: if (datalen != sizeof retval && datalen != 0)
570: fatalx("bad MSG_EXIT size");
571: if (datalen == sizeof retval) {
572: memcpy(&retval, data, sizeof retval);
573: client_exitval = retval;
1.46 nicm 574: }
575: imsg_free(&imsg);
576: return (-1);
577: case MSG_READY:
578: if (datalen != 0)
579: fatalx("bad MSG_READY size");
580:
1.54 nicm 581: event_del(&client_stdin);
1.46 nicm 582: client_attached = 1;
1.65 nicm 583: client_write_server(MSG_RESIZE, NULL, 0);
1.60 nicm 584: break;
585: case MSG_STDIN:
586: if (datalen != 0)
587: fatalx("bad MSG_STDIN size");
588:
589: event_add(&client_stdin, NULL);
1.46 nicm 590: break;
1.54 nicm 591: case MSG_STDOUT:
592: if (datalen != sizeof stdoutdata)
1.69 nicm 593: fatalx("bad MSG_STDOUT size");
594: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.54 nicm 595:
1.70 nicm 596: client_write(STDOUT_FILENO, stdoutdata.data,
597: stdoutdata.size);
1.54 nicm 598: break;
599: case MSG_STDERR:
600: if (datalen != sizeof stderrdata)
1.69 nicm 601: fatalx("bad MSG_STDERR size");
602: memcpy(&stderrdata, data, sizeof stderrdata);
1.54 nicm 603:
1.70 nicm 604: client_write(STDERR_FILENO, stderrdata.data,
605: stderrdata.size);
1.54 nicm 606: break;
1.46 nicm 607: case MSG_VERSION:
608: if (datalen != 0)
609: fatalx("bad MSG_VERSION size");
610:
1.54 nicm 611: fprintf(stderr, "protocol version mismatch "
1.86 nicm 612: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.54 nicm 613: imsg.hdr.peerid);
1.46 nicm 614: client_exitval = 1;
615:
616: imsg_free(&imsg);
617: return (-1);
618: case MSG_SHELL:
1.72 nicm 619: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 620: fatalx("bad MSG_SHELL string");
1.46 nicm 621:
622: clear_signals(0);
1.69 nicm 623: shell_exec(data, data0);
1.46 nicm 624: /* NOTREACHED */
1.56 nicm 625: case MSG_DETACH:
1.73 nicm 626: case MSG_DETACHKILL:
1.56 nicm 627: client_write_server(MSG_EXITING, NULL, 0);
628: break;
629: case MSG_EXITED:
630: imsg_free(&imsg);
631: return (-1);
1.46 nicm 632: }
633:
634: imsg_free(&imsg);
635: }
636: }
637:
638: /* Dispatch imsgs in attached state (after MSG_READY). */
1.9 nicm 639: int
1.46 nicm 640: client_dispatch_attached(void)
1.9 nicm 641: {
1.69 nicm 642: struct imsg imsg;
643: struct sigaction sigact;
644: char *data;
645: ssize_t n, datalen;
1.9 nicm 646:
647: for (;;) {
1.25 nicm 648: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 649: fatalx("imsg_get failed");
650: if (n == 0)
1.9 nicm 651: return (0);
1.69 nicm 652:
653: data = imsg.data;
1.12 nicm 654: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 655:
1.86 nicm 656: log_debug("got %u from server", imsg.hdr.type);
1.12 nicm 657: switch (imsg.hdr.type) {
1.73 nicm 658: case MSG_DETACH:
1.48 nicm 659: case MSG_DETACHKILL:
1.73 nicm 660: if (datalen == 0 || data[datalen - 1] != '\0')
661: fatalx("bad MSG_DETACH string");
1.9 nicm 662:
1.73 nicm 663: client_exitsession = xstrdup(data);
1.48 nicm 664: client_exittype = imsg.hdr.type;
665: if (imsg.hdr.type == MSG_DETACHKILL)
1.52 nicm 666: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
1.48 nicm 667: else
1.52 nicm 668: client_exitreason = CLIENT_EXIT_DETACHED;
1.25 nicm 669: client_write_server(MSG_EXITING, NULL, 0);
1.9 nicm 670: break;
671: case MSG_EXIT:
1.69 nicm 672: if (datalen != 0 && datalen != sizeof (int))
1.9 nicm 673: fatalx("bad MSG_EXIT size");
1.12 nicm 674:
1.25 nicm 675: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 676: client_exitreason = CLIENT_EXIT_EXITED;
1.9 nicm 677: break;
678: case MSG_EXITED:
1.12 nicm 679: if (datalen != 0)
1.9 nicm 680: fatalx("bad MSG_EXITED size");
681:
1.12 nicm 682: imsg_free(&imsg);
1.9 nicm 683: return (-1);
684: case MSG_SHUTDOWN:
1.12 nicm 685: if (datalen != 0)
1.9 nicm 686: fatalx("bad MSG_SHUTDOWN size");
687:
1.25 nicm 688: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 689: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
1.32 nicm 690: client_exitval = 1;
1.9 nicm 691: break;
692: case MSG_SUSPEND:
1.12 nicm 693: if (datalen != 0)
1.9 nicm 694: fatalx("bad MSG_SUSPEND size");
695:
1.30 nicm 696: memset(&sigact, 0, sizeof sigact);
697: sigemptyset(&sigact.sa_mask);
698: sigact.sa_flags = SA_RESTART;
699: sigact.sa_handler = SIG_DFL;
700: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
701: fatal("sigaction failed");
702: kill(getpid(), SIGTSTP);
1.21 nicm 703: break;
704: case MSG_LOCK:
1.72 nicm 705: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 706: fatalx("bad MSG_LOCK string");
1.35 nicm 707:
1.69 nicm 708: system(data);
1.25 nicm 709: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 710: break;
711: }
1.12 nicm 712:
713: imsg_free(&imsg);
1.9 nicm 714: }
1.1 nicm 715: }
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