Annotation of src/usr.bin/tmux/client.c, Revision 1.141
1.141 ! nicm 1: /* $OpenBSD: client.c,v 1.140 2020/04/09 13:52:32 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>
20: #include <sys/socket.h>
21: #include <sys/un.h>
22: #include <sys/wait.h>
23:
24: #include <errno.h>
1.30 nicm 25: #include <event.h>
1.80 nicm 26: #include <fcntl.h>
1.99 nicm 27: #include <imsg.h>
1.85 nicm 28: #include <signal.h>
1.1 nicm 29: #include <stdlib.h>
30: #include <string.h>
31: #include <unistd.h>
32:
33: #include "tmux.h"
34:
1.114 nicm 35: static struct tmuxproc *client_proc;
36: static struct tmuxpeer *client_peer;
37: static int client_flags;
38: static enum {
1.52 nicm 39: CLIENT_EXIT_NONE,
40: CLIENT_EXIT_DETACHED,
41: CLIENT_EXIT_DETACHED_HUP,
42: CLIENT_EXIT_LOST_TTY,
43: CLIENT_EXIT_TERMINATED,
44: CLIENT_EXIT_LOST_SERVER,
45: CLIENT_EXIT_EXITED,
46: CLIENT_EXIT_SERVER_EXITED,
47: } client_exitreason = CLIENT_EXIT_NONE;
1.133 nicm 48: static int client_exitflag;
1.114 nicm 49: static int client_exitval;
50: static enum msgtype client_exittype;
51: static const char *client_exitsession;
1.115 nicm 52: static const char *client_execshell;
53: static const char *client_execcmd;
1.114 nicm 54: static int client_attached;
1.132 nicm 55: static struct client_files client_files = RB_INITIALIZER(&client_files);
1.114 nicm 56:
57: static __dead void client_exec(const char *,const char *);
58: static int client_get_lock(char *);
59: static int client_connect(struct event_base *, const char *, int);
60: static void client_send_identify(const char *, const char *);
61: static void client_signal(int);
62: static void client_dispatch(struct imsg *, void *);
63: static void client_dispatch_attached(struct imsg *);
1.121 nicm 64: static void client_dispatch_wait(struct imsg *);
1.114 nicm 65: static const char *client_exit_message(void);
1.25 nicm 66:
1.49 nicm 67: /*
68: * Get server create lock. If already held then server start is happening in
1.110 nicm 69: * another client, so block until the lock is released and return -2 to
70: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 71: */
1.114 nicm 72: static int
1.49 nicm 73: client_get_lock(char *lockfile)
74: {
75: int lockfd;
76:
1.110 nicm 77: log_debug("lock file is %s", lockfile);
78:
1.109 nicm 79: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 80: log_debug("open failed: %s", strerror(errno));
81: return (-1);
1.109 nicm 82: }
1.49 nicm 83:
1.82 nicm 84: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
85: log_debug("flock failed: %s", strerror(errno));
86: if (errno != EAGAIN)
87: return (lockfd);
88: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 89: /* nothing */;
90: close(lockfd);
1.110 nicm 91: return (-2);
1.49 nicm 92: }
1.82 nicm 93: log_debug("flock succeeded");
1.49 nicm 94:
95: return (lockfd);
96: }
97:
1.46 nicm 98: /* Connect client to server. */
1.114 nicm 99: static int
1.138 nicm 100: client_connect(struct event_base *base, const char *path, int flags)
1.1 nicm 101: {
1.26 nicm 102: struct sockaddr_un sa;
103: size_t size;
1.82 nicm 104: int fd, lockfd = -1, locked = 0;
105: char *lockfile = NULL;
1.1 nicm 106:
107: memset(&sa, 0, sizeof sa);
108: sa.sun_family = AF_UNIX;
109: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
110: if (size >= sizeof sa.sun_path) {
111: errno = ENAMETOOLONG;
1.46 nicm 112: return (-1);
1.1 nicm 113: }
1.82 nicm 114: log_debug("socket is %s", path);
1.1 nicm 115:
1.49 nicm 116: retry:
1.10 nicm 117: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 118: return (-1);
1.1 nicm 119:
1.82 nicm 120: log_debug("trying connect");
1.109 nicm 121: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 122: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 123: if (errno != ECONNREFUSED && errno != ENOENT)
124: goto failed;
1.138 nicm 125: if (~flags & CLIENT_STARTSERVER)
1.46 nicm 126: goto failed;
1.49 nicm 127: close(fd);
128:
1.82 nicm 129: if (!locked) {
130: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 131: if ((lockfd = client_get_lock(lockfile)) < 0) {
132: log_debug("didn't get lock (%d)", lockfd);
133:
1.82 nicm 134: free(lockfile);
1.110 nicm 135: lockfile = NULL;
136:
137: if (lockfd == -2)
138: goto retry;
1.82 nicm 139: }
1.110 nicm 140: log_debug("got lock (%d)", lockfd);
1.82 nicm 141:
142: /*
143: * Always retry at least once, even if we got the lock,
144: * because another client could have taken the lock,
145: * started the server and released the lock between our
146: * connect() and flock().
147: */
148: locked = 1;
1.49 nicm 149: goto retry;
1.78 nicm 150: }
1.82 nicm 151:
1.110 nicm 152: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 153: free(lockfile);
154: close(lockfd);
1.49 nicm 155: return (-1);
1.78 nicm 156: }
1.138 nicm 157: fd = server_start(client_proc, flags, base, lockfd, lockfile);
1.82 nicm 158: }
1.95 nicm 159:
1.110 nicm 160: if (locked && lockfd >= 0) {
1.58 nicm 161: free(lockfile);
1.49 nicm 162: close(lockfd);
1.1 nicm 163: }
1.47 nicm 164: setblocking(fd, 0);
1.46 nicm 165: return (fd);
166:
167: failed:
1.95 nicm 168: if (locked) {
169: free(lockfile);
170: close(lockfd);
171: }
1.46 nicm 172: close(fd);
173: return (-1);
174: }
175:
1.52 nicm 176: /* Get exit string from reason number. */
177: const char *
178: client_exit_message(void)
179: {
1.73 nicm 180: static char msg[256];
181:
1.52 nicm 182: switch (client_exitreason) {
183: case CLIENT_EXIT_NONE:
184: break;
185: case CLIENT_EXIT_DETACHED:
1.73 nicm 186: if (client_exitsession != NULL) {
187: xsnprintf(msg, sizeof msg, "detached "
188: "(from session %s)", client_exitsession);
189: return (msg);
190: }
1.52 nicm 191: return ("detached");
192: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 193: if (client_exitsession != NULL) {
194: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
195: "(from session %s)", client_exitsession);
196: return (msg);
197: }
1.52 nicm 198: return ("detached and SIGHUP");
199: case CLIENT_EXIT_LOST_TTY:
200: return ("lost tty");
201: case CLIENT_EXIT_TERMINATED:
202: return ("terminated");
203: case CLIENT_EXIT_LOST_SERVER:
1.131 nicm 204: return ("server exited unexpectedly");
1.52 nicm 205: case CLIENT_EXIT_EXITED:
206: return ("exited");
207: case CLIENT_EXIT_SERVER_EXITED:
208: return ("server exited");
209: }
210: return ("unknown reason");
211: }
212:
1.133 nicm 213: /* Exit if all streams flushed. */
214: static void
215: client_exit(void)
216: {
217: struct client_file *cf;
218: size_t left;
219: int waiting = 0;
220:
221: RB_FOREACH (cf, client_files, &client_files) {
222: if (cf->event == NULL)
223: continue;
224: left = EVBUFFER_LENGTH(cf->event->output);
225: if (left != 0) {
226: waiting++;
227: log_debug("file %u %zu bytes left", cf->stream, left);
228: }
229: }
230: if (waiting == 0)
231: proc_exit(client_proc);
232: }
233:
1.46 nicm 234: /* Client main loop. */
235: int
1.121 nicm 236: client_main(struct event_base *base, int argc, char **argv, int flags)
1.46 nicm 237: {
1.129 nicm 238: struct cmd_parse_result *pr;
1.132 nicm 239: struct msg_command *data;
1.138 nicm 240: int fd, i;
1.98 nicm 241: const char *ttynam, *cwd;
1.48 nicm 242: pid_t ppid;
1.46 nicm 243: enum msgtype msg;
1.56 nicm 244: struct termios tio, saved_tio;
1.70 nicm 245: size_t size;
1.46 nicm 246:
1.99 nicm 247: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
248: signal(SIGCHLD, SIG_IGN);
249:
1.46 nicm 250: /* Set up the initial command. */
1.121 nicm 251: if (shell_command != NULL) {
1.46 nicm 252: msg = MSG_SHELL;
1.139 nicm 253: flags |= CLIENT_STARTSERVER;
1.46 nicm 254: } else if (argc == 0) {
255: msg = MSG_COMMAND;
1.138 nicm 256: flags |= CLIENT_STARTSERVER;
1.46 nicm 257: } else {
258: msg = MSG_COMMAND;
259:
260: /*
261: * It sucks parsing the command string twice (in client and
262: * later in server) but it is necessary to get the start server
263: * flag.
264: */
1.129 nicm 265: pr = cmd_parse_from_arguments(argc, argv, NULL);
266: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 ! nicm 267: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
! 268: flags |= CLIENT_STARTSERVER;
1.129 nicm 269: cmd_list_free(pr->cmdlist);
270: } else
271: free(pr->error);
1.46 nicm 272: }
273:
1.138 nicm 274: /* Save the flags. */
275: client_flags = flags;
276:
1.109 nicm 277: /* Create client process structure (starts logging). */
1.122 nicm 278: client_proc = proc_start("client");
279: proc_set_signals(client_proc, client_signal);
1.109 nicm 280:
1.82 nicm 281: /* Initialize the client socket and start the server. */
1.138 nicm 282: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 283: if (fd == -1) {
1.87 nicm 284: if (errno == ECONNREFUSED) {
285: fprintf(stderr, "no server running on %s\n",
286: socket_path);
287: } else {
288: fprintf(stderr, "error connecting to %s (%s)\n",
289: socket_path, strerror(errno));
290: }
1.46 nicm 291: return (1);
292: }
1.121 nicm 293: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 294:
1.97 nicm 295: /* Save these before pledge(). */
1.128 nicm 296: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 297: cwd = "/";
1.97 nicm 298: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
299: ttynam = "";
300:
301: /*
302: * Drop privileges for client. "proc exec" is needed for -c and for
303: * locking (which uses system(3)).
304: *
305: * "tty" is needed to restore termios(4) and also for some reason -CC
306: * does not work properly without it (input is not recognised).
307: *
308: * "sendfd" is dropped later in client_dispatch_wait().
309: */
1.132 nicm 310: if (pledge(
311: "stdio rpath wpath cpath unix sendfd proc exec tty",
312: NULL) != 0)
1.97 nicm 313: fatal("pledge failed");
314:
315: /* Free stuff that is not used in the client. */
1.119 nicm 316: if (ptm_fd != -1)
317: close(ptm_fd);
1.100 nicm 318: options_free(global_options);
319: options_free(global_s_options);
320: options_free(global_w_options);
1.101 nicm 321: environ_free(global_environ);
1.46 nicm 322:
1.132 nicm 323: /* Set up control mode. */
1.93 nicm 324: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 325: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
326: fprintf(stderr, "tcgetattr failed: %s\n",
327: strerror(errno));
328: return (1);
329: }
1.56 nicm 330: cfmakeraw(&tio);
331: tio.c_iflag = ICRNL|IXANY;
332: tio.c_oflag = OPOST|ONLCR;
333: tio.c_lflag = NOKERNINFO;
334: tio.c_cflag = CREAD|CS8|HUPCL;
335: tio.c_cc[VMIN] = 1;
336: tio.c_cc[VTIME] = 0;
337: cfsetispeed(&tio, cfgetispeed(&saved_tio));
338: cfsetospeed(&tio, cfgetospeed(&saved_tio));
339: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
340: }
1.1 nicm 341:
1.71 nicm 342: /* Send identify messages. */
1.98 nicm 343: client_send_identify(ttynam, cwd);
1.1 nicm 344:
1.46 nicm 345: /* Send first command. */
346: if (msg == MSG_COMMAND) {
1.70 nicm 347: /* How big is the command? */
348: size = 0;
349: for (i = 0; i < argc; i++)
350: size += strlen(argv[i]) + 1;
1.124 nicm 351: if (size > MAX_IMSGSIZE - (sizeof *data)) {
352: fprintf(stderr, "command too long\n");
353: return (1);
354: }
1.70 nicm 355: data = xmalloc((sizeof *data) + size);
1.46 nicm 356:
357: /* Prepare command for server. */
1.70 nicm 358: data->argc = argc;
1.83 nicm 359: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 360: fprintf(stderr, "command too long\n");
1.70 nicm 361: free(data);
1.46 nicm 362: return (1);
363: }
1.70 nicm 364: size += sizeof *data;
1.46 nicm 365:
1.70 nicm 366: /* Send the command. */
1.99 nicm 367: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 368: fprintf(stderr, "failed to send command\n");
369: free(data);
370: return (1);
371: }
372: free(data);
1.46 nicm 373: } else if (msg == MSG_SHELL)
1.99 nicm 374: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 375:
1.99 nicm 376: /* Start main loop. */
377: proc_loop(client_proc, NULL);
1.46 nicm 378:
1.115 nicm 379: /* Run command if user requested exec, instead of exiting. */
380: if (client_exittype == MSG_EXEC) {
381: if (client_flags & CLIENT_CONTROLCONTROL)
382: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
383: client_exec(client_execshell, client_execcmd);
384: }
385:
1.46 nicm 386: /* Print the exit message, if any, and exit. */
1.48 nicm 387: if (client_attached) {
1.93 nicm 388: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 389: printf("[%s]\n", client_exit_message());
1.48 nicm 390:
391: ppid = getppid();
392: if (client_exittype == MSG_DETACHKILL && ppid > 1)
393: kill(ppid, SIGHUP);
1.93 nicm 394: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 395: if (client_exitreason != CLIENT_EXIT_NONE)
396: printf("%%exit %s\n", client_exit_message());
397: else
398: printf("%%exit\n");
399: printf("\033\\");
1.56 nicm 400: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 401: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 402: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 403: setblocking(STDIN_FILENO, 1);
1.46 nicm 404: return (client_exitval);
1.1 nicm 405: }
406:
1.71 nicm 407: /* Send identify messages to server. */
1.114 nicm 408: static void
1.98 nicm 409: client_send_identify(const char *ttynam, const char *cwd)
1.26 nicm 410: {
1.90 nicm 411: const char *s;
1.71 nicm 412: char **ss;
1.91 nicm 413: size_t sslen;
1.93 nicm 414: int fd, flags = client_flags;
1.90 nicm 415: pid_t pid;
1.71 nicm 416:
1.99 nicm 417: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 418:
419: if ((s = getenv("TERM")) == NULL)
420: s = "";
1.99 nicm 421: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.71 nicm 422:
1.107 nicm 423: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
424: strlen(ttynam) + 1);
1.99 nicm 425: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 426:
1.50 nicm 427: if ((fd = dup(STDIN_FILENO)) == -1)
428: fatal("dup failed");
1.99 nicm 429: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.90 nicm 430:
431: pid = getpid();
1.99 nicm 432: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 433:
1.91 nicm 434: for (ss = environ; *ss != NULL; ss++) {
435: sslen = strlen(*ss) + 1;
1.107 nicm 436: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
437: continue;
438: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 439: }
1.75 nicm 440:
1.99 nicm 441: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 442: }
443:
1.132 nicm 444: /* File write error callback. */
1.114 nicm 445: static void
1.132 nicm 446: client_write_error_callback(__unused struct bufferevent *bev,
447: __unused short what, void *arg)
1.54 nicm 448: {
1.132 nicm 449: struct client_file *cf = arg;
1.54 nicm 450:
1.132 nicm 451: log_debug("write error file %d", cf->stream);
452:
453: bufferevent_free(cf->event);
454: cf->event = NULL;
455:
456: close(cf->fd);
457: cf->fd = -1;
1.134 nicm 458:
459: if (client_exitflag)
460: client_exit();
1.132 nicm 461: }
462:
463: /* File write callback. */
464: static void
465: client_write_callback(__unused struct bufferevent *bev, void *arg)
466: {
467: struct client_file *cf = arg;
468:
469: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
470: bufferevent_free(cf->event);
471: close(cf->fd);
472: RB_REMOVE(client_files, &client_files, cf);
473: file_free(cf);
474: }
1.133 nicm 475:
476: if (client_exitflag)
477: client_exit();
1.132 nicm 478: }
479:
480: /* Open write file. */
481: static void
482: client_write_open(void *data, size_t datalen)
483: {
484: struct msg_write_open *msg = data;
1.135 nicm 485: const char *path;
1.132 nicm 486: struct msg_write_ready reply;
487: struct client_file find, *cf;
488: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
489: int error = 0;
490:
1.135 nicm 491: if (datalen < sizeof *msg)
1.132 nicm 492: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 493: if (datalen == sizeof *msg)
494: path = "-";
495: else
496: path = (const char *)(msg + 1);
497: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 498:
499: find.stream = msg->stream;
500: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
501: cf = file_create(NULL, msg->stream, NULL, NULL);
502: RB_INSERT(client_files, &client_files, cf);
503: } else {
504: error = EBADF;
505: goto reply;
506: }
507: if (cf->closed) {
508: error = EBADF;
509: goto reply;
510: }
511:
512: cf->fd = -1;
513: if (msg->fd == -1)
1.135 nicm 514: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 515: else {
516: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
517: errno = EBADF;
518: else {
519: cf->fd = dup(msg->fd);
520: if (client_flags & CLIENT_CONTROL)
521: close(msg->fd); /* can only be used once */
522: }
523: }
524: if (cf->fd == -1) {
525: error = errno;
526: goto reply;
527: }
528:
529: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
530: client_write_error_callback, cf);
531: bufferevent_enable(cf->event, EV_WRITE);
532: goto reply;
533:
534: reply:
535: reply.stream = msg->stream;
536: reply.error = error;
537: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
538: }
539:
540: /* Write to client file. */
541: static void
542: client_write_data(void *data, size_t datalen)
543: {
544: struct msg_write_data *msg = data;
545: struct client_file find, *cf;
1.135 nicm 546: size_t size = datalen - sizeof *msg;
1.132 nicm 547:
1.135 nicm 548: if (datalen < sizeof *msg)
1.132 nicm 549: fatalx("bad MSG_WRITE size");
550: find.stream = msg->stream;
551: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
552: fatalx("unknown stream number");
1.135 nicm 553: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 554:
555: if (cf->event != NULL)
1.135 nicm 556: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 557: }
558:
559: /* Close client file. */
560: static void
561: client_write_close(void *data, size_t datalen)
562: {
563: struct msg_write_close *msg = data;
564: struct client_file find, *cf;
1.54 nicm 565:
1.132 nicm 566: if (datalen != sizeof *msg)
567: fatalx("bad MSG_WRITE_CLOSE size");
568: find.stream = msg->stream;
569: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
570: fatalx("unknown stream number");
571: log_debug("close file %d", cf->stream);
572:
573: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
574: if (cf->event != NULL)
575: bufferevent_free(cf->event);
576: if (cf->fd != -1)
577: close(cf->fd);
578: RB_REMOVE(client_files, &client_files, cf);
579: file_free(cf);
580: }
1.54 nicm 581: }
582:
1.132 nicm 583: /* File read callback. */
1.114 nicm 584: static void
1.132 nicm 585: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 586: {
1.132 nicm 587: struct client_file *cf = arg;
588: void *bdata;
589: size_t bsize;
1.135 nicm 590: struct msg_read_data *msg;
591: size_t msglen;
1.132 nicm 592:
1.135 nicm 593: msg = xmalloc(sizeof *msg);
1.132 nicm 594: for (;;) {
595: bdata = EVBUFFER_DATA(cf->event->input);
596: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 597:
1.132 nicm 598: if (bsize == 0)
1.57 nicm 599: break;
1.136 nicm 600: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
601: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 602: log_debug("read %zu from file %d", bsize, cf->stream);
603:
1.135 nicm 604: msglen = (sizeof *msg) + bsize;
605: msg = xrealloc(msg, msglen);
606: msg->stream = cf->stream;
607: memcpy(msg + 1, bdata, bsize);
608: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 609:
610: evbuffer_drain(cf->event->input, bsize);
611: }
1.135 nicm 612: free(msg);
1.132 nicm 613: }
614:
615: /* File read error callback. */
616: static void
617: client_read_error_callback(__unused struct bufferevent *bev,
618: __unused short what, void *arg)
619: {
620: struct client_file *cf = arg;
621: struct msg_read_done msg;
622:
623: log_debug("read error file %d", cf->stream);
624:
625: msg.stream = cf->stream;
626: msg.error = 0;
627: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
628:
629: bufferevent_free(cf->event);
630: close(cf->fd);
631: RB_REMOVE(client_files, &client_files, cf);
632: file_free(cf);
633: }
634:
635: /* Open read file. */
636: static void
637: client_read_open(void *data, size_t datalen)
638: {
639: struct msg_read_open *msg = data;
1.135 nicm 640: const char *path;
1.132 nicm 641: struct msg_read_done reply;
642: struct client_file find, *cf;
643: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 644: int error;
1.132 nicm 645:
1.135 nicm 646: if (datalen < sizeof *msg)
1.132 nicm 647: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 648: if (datalen == sizeof *msg)
649: path = "-";
650: else
651: path = (const char *)(msg + 1);
652: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 653:
654: find.stream = msg->stream;
655: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
656: cf = file_create(NULL, msg->stream, NULL, NULL);
657: RB_INSERT(client_files, &client_files, cf);
658: } else {
659: error = EBADF;
660: goto reply;
1.57 nicm 661: }
1.132 nicm 662: if (cf->closed) {
663: error = EBADF;
664: goto reply;
665: }
666:
667: cf->fd = -1;
668: if (msg->fd == -1)
1.135 nicm 669: cf->fd = open(path, flags);
1.132 nicm 670: else {
671: if (msg->fd != STDIN_FILENO)
672: errno = EBADF;
673: else {
674: cf->fd = dup(msg->fd);
675: close(msg->fd); /* can only be used once */
676: }
677: }
678: if (cf->fd == -1) {
679: error = errno;
680: goto reply;
681: }
682:
683: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
684: client_read_error_callback, cf);
685: bufferevent_enable(cf->event, EV_READ);
686: return;
687:
688: reply:
689: reply.stream = msg->stream;
690: reply.error = error;
691: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 692: }
693:
1.93 nicm 694: /* Run command in shell; used for -c. */
1.114 nicm 695: static __dead void
1.111 nicm 696: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 697: {
698: const char *name, *ptr;
699: char *argv0;
700:
1.111 nicm 701: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 702:
703: ptr = strrchr(shell, '/');
704: if (ptr != NULL && *(ptr + 1) != '\0')
705: name = ptr + 1;
706: else
707: name = shell;
708: if (client_flags & CLIENT_LOGIN)
709: xasprintf(&argv0, "-%s", name);
710: else
711: xasprintf(&argv0, "%s", name);
712: setenv("SHELL", shell, 1);
713:
1.123 nicm 714: proc_clear_signals(client_proc, 1);
715:
1.93 nicm 716: setblocking(STDIN_FILENO, 1);
717: setblocking(STDOUT_FILENO, 1);
718: setblocking(STDERR_FILENO, 1);
719: closefrom(STDERR_FILENO + 1);
720:
1.111 nicm 721: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 722: fatal("execl failed");
723: }
724:
1.99 nicm 725: /* Callback to handle signals in the client. */
1.114 nicm 726: static void
1.99 nicm 727: client_signal(int sig)
728: {
729: struct sigaction sigact;
730: int status;
731:
732: if (sig == SIGCHLD)
733: waitpid(WAIT_ANY, &status, WNOHANG);
734: else if (!client_attached) {
735: if (sig == SIGTERM)
736: proc_exit(client_proc);
737: } else {
738: switch (sig) {
739: case SIGHUP:
740: client_exitreason = CLIENT_EXIT_LOST_TTY;
741: client_exitval = 1;
742: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
743: break;
744: case SIGTERM:
745: client_exitreason = CLIENT_EXIT_TERMINATED;
746: client_exitval = 1;
747: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
748: break;
749: case SIGWINCH:
750: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
751: break;
752: case SIGCONT:
753: memset(&sigact, 0, sizeof sigact);
754: sigemptyset(&sigact.sa_mask);
755: sigact.sa_flags = SA_RESTART;
756: sigact.sa_handler = SIG_IGN;
757: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
758: fatal("sigaction failed");
759: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
760: break;
761: }
762: }
763: }
764:
765: /* Callback for client read events. */
1.114 nicm 766: static void
1.121 nicm 767: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 768: {
769: if (imsg == NULL) {
770: client_exitreason = CLIENT_EXIT_LOST_SERVER;
771: client_exitval = 1;
1.109 nicm 772: proc_exit(client_proc);
773: return;
774: }
775:
776: if (client_attached)
1.99 nicm 777: client_dispatch_attached(imsg);
778: else
1.121 nicm 779: client_dispatch_wait(imsg);
1.99 nicm 780: }
781:
1.46 nicm 782: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 783: static void
1.121 nicm 784: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 785: {
1.132 nicm 786: char *data;
787: ssize_t datalen;
788: int retval;
789: static int pledge_applied;
1.97 nicm 790:
791: /*
792: * "sendfd" is no longer required once all of the identify messages
793: * have been sent. We know the server won't send us anything until that
794: * point (because we don't ask it to), so we can drop "sendfd" once we
795: * get the first message from the server.
796: */
797: if (!pledge_applied) {
1.132 nicm 798: if (pledge(
799: "stdio rpath wpath cpath unix proc exec tty",
800: NULL) != 0)
1.97 nicm 801: fatal("pledge failed");
802: pledge_applied = 1;
1.132 nicm 803: }
1.46 nicm 804:
1.99 nicm 805: data = imsg->data;
806: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 807:
1.99 nicm 808: switch (imsg->hdr.type) {
809: case MSG_EXIT:
810: case MSG_SHUTDOWN:
811: if (datalen != sizeof retval && datalen != 0)
812: fatalx("bad MSG_EXIT size");
813: if (datalen == sizeof retval) {
814: memcpy(&retval, data, sizeof retval);
815: client_exitval = retval;
816: }
1.133 nicm 817: client_exitflag = 1;
818: client_exit();
1.99 nicm 819: break;
820: case MSG_READY:
821: if (datalen != 0)
822: fatalx("bad MSG_READY size");
1.54 nicm 823:
1.99 nicm 824: client_attached = 1;
825: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
826: break;
827: case MSG_VERSION:
828: if (datalen != 0)
829: fatalx("bad MSG_VERSION size");
830:
831: fprintf(stderr, "protocol version mismatch "
832: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 833: imsg->hdr.peerid & 0xff);
1.99 nicm 834: client_exitval = 1;
835: proc_exit(client_proc);
836: break;
837: case MSG_SHELL:
838: if (datalen == 0 || data[datalen - 1] != '\0')
839: fatalx("bad MSG_SHELL string");
840:
1.121 nicm 841: client_exec(data, shell_command);
1.99 nicm 842: /* NOTREACHED */
843: case MSG_DETACH:
844: case MSG_DETACHKILL:
845: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
846: break;
847: case MSG_EXITED:
848: proc_exit(client_proc);
1.132 nicm 849: break;
850: case MSG_READ_OPEN:
851: client_read_open(data, datalen);
852: break;
853: case MSG_WRITE_OPEN:
854: client_write_open(data, datalen);
855: break;
856: case MSG_WRITE:
857: client_write_data(data, datalen);
858: break;
859: case MSG_WRITE_CLOSE:
860: client_write_close(data, datalen);
1.137 nicm 861: break;
862: case MSG_OLDSTDERR:
863: case MSG_OLDSTDIN:
864: case MSG_OLDSTDOUT:
865: fprintf(stderr, "server version is too old for client\n");
866: proc_exit(client_proc);
1.99 nicm 867: break;
1.46 nicm 868: }
869: }
870:
871: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 872: static void
1.99 nicm 873: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 874: {
1.69 nicm 875: struct sigaction sigact;
876: char *data;
1.99 nicm 877: ssize_t datalen;
1.9 nicm 878:
1.99 nicm 879: data = imsg->data;
880: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 881:
1.99 nicm 882: switch (imsg->hdr.type) {
883: case MSG_DETACH:
884: case MSG_DETACHKILL:
885: if (datalen == 0 || data[datalen - 1] != '\0')
886: fatalx("bad MSG_DETACH string");
887:
888: client_exitsession = xstrdup(data);
889: client_exittype = imsg->hdr.type;
890: if (imsg->hdr.type == MSG_DETACHKILL)
891: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
892: else
893: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 894: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
895: break;
896: case MSG_EXEC:
897: if (datalen == 0 || data[datalen - 1] != '\0' ||
898: strlen(data) + 1 == (size_t)datalen)
899: fatalx("bad MSG_EXEC string");
900: client_execcmd = xstrdup(data);
901: client_execshell = xstrdup(data + strlen(data) + 1);
902:
903: client_exittype = imsg->hdr.type;
1.99 nicm 904: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
905: break;
906: case MSG_EXIT:
907: if (datalen != 0 && datalen != sizeof (int))
908: fatalx("bad MSG_EXIT size");
1.9 nicm 909:
1.99 nicm 910: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
911: client_exitreason = CLIENT_EXIT_EXITED;
912: break;
913: case MSG_EXITED:
914: if (datalen != 0)
915: fatalx("bad MSG_EXITED size");
1.9 nicm 916:
1.99 nicm 917: proc_exit(client_proc);
918: break;
919: case MSG_SHUTDOWN:
920: if (datalen != 0)
921: fatalx("bad MSG_SHUTDOWN size");
922:
923: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
924: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
925: client_exitval = 1;
926: break;
927: case MSG_SUSPEND:
928: if (datalen != 0)
929: fatalx("bad MSG_SUSPEND size");
930:
931: memset(&sigact, 0, sizeof sigact);
932: sigemptyset(&sigact.sa_mask);
933: sigact.sa_flags = SA_RESTART;
934: sigact.sa_handler = SIG_DFL;
935: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
936: fatal("sigaction failed");
937: kill(getpid(), SIGTSTP);
938: break;
939: case MSG_LOCK:
940: if (datalen == 0 || data[datalen - 1] != '\0')
941: fatalx("bad MSG_LOCK string");
1.9 nicm 942:
1.99 nicm 943: system(data);
944: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
945: break;
1.9 nicm 946: }
1.1 nicm 947: }
![[BACK]](/icons/back.gif){kind=icon}
Return to client.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / tmux