Annotation of src/usr.bin/tmux/client.c, Revision 1.145
1.145 ! nicm 1: /* $OpenBSD: client.c,v 1.144 2020/05/08 14:15:11 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>
1.144 nicm 21: #include <sys/uio.h>
1.1 nicm 22: #include <sys/un.h>
23: #include <sys/wait.h>
24:
25: #include <errno.h>
1.30 nicm 26: #include <event.h>
1.80 nicm 27: #include <fcntl.h>
1.99 nicm 28: #include <imsg.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:
1.114 nicm 36: static struct tmuxproc *client_proc;
37: static struct tmuxpeer *client_peer;
38: static int client_flags;
39: static enum {
1.52 nicm 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;
1.133 nicm 49: static int client_exitflag;
1.114 nicm 50: static int client_exitval;
51: static enum msgtype client_exittype;
52: static const char *client_exitsession;
1.115 nicm 53: static const char *client_execshell;
54: static const char *client_execcmd;
1.114 nicm 55: static int client_attached;
1.132 nicm 56: static struct client_files client_files = RB_INITIALIZER(&client_files);
1.114 nicm 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);
1.142 nicm 61: static void client_send_identify(const char *, const char *, int);
1.114 nicm 62: static void client_signal(int);
63: static void client_dispatch(struct imsg *, void *);
64: static void client_dispatch_attached(struct imsg *);
1.121 nicm 65: static void client_dispatch_wait(struct imsg *);
1.114 nicm 66: static const char *client_exit_message(void);
1.25 nicm 67:
1.49 nicm 68: /*
69: * Get server create lock. If already held then server start is happening in
1.110 nicm 70: * another client, so block until the lock is released and return -2 to
71: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 72: */
1.114 nicm 73: static int
1.49 nicm 74: client_get_lock(char *lockfile)
75: {
76: int lockfd;
77:
1.110 nicm 78: log_debug("lock file is %s", lockfile);
79:
1.109 nicm 80: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 81: log_debug("open failed: %s", strerror(errno));
82: return (-1);
1.109 nicm 83: }
1.49 nicm 84:
1.82 nicm 85: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
86: log_debug("flock failed: %s", strerror(errno));
87: if (errno != EAGAIN)
88: return (lockfd);
89: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 90: /* nothing */;
91: close(lockfd);
1.110 nicm 92: return (-2);
1.49 nicm 93: }
1.82 nicm 94: log_debug("flock succeeded");
1.49 nicm 95:
96: return (lockfd);
97: }
98:
1.46 nicm 99: /* Connect client to server. */
1.114 nicm 100: static int
1.138 nicm 101: client_connect(struct event_base *base, const char *path, int flags)
1.1 nicm 102: {
1.26 nicm 103: struct sockaddr_un sa;
104: size_t size;
1.82 nicm 105: int fd, lockfd = -1, locked = 0;
106: char *lockfile = NULL;
1.1 nicm 107:
108: memset(&sa, 0, sizeof sa);
109: sa.sun_family = AF_UNIX;
110: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
111: if (size >= sizeof sa.sun_path) {
112: errno = ENAMETOOLONG;
1.46 nicm 113: return (-1);
1.1 nicm 114: }
1.82 nicm 115: log_debug("socket is %s", path);
1.1 nicm 116:
1.49 nicm 117: retry:
1.10 nicm 118: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 119: return (-1);
1.1 nicm 120:
1.82 nicm 121: log_debug("trying connect");
1.109 nicm 122: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 123: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 124: if (errno != ECONNREFUSED && errno != ENOENT)
125: goto failed;
1.138 nicm 126: if (~flags & CLIENT_STARTSERVER)
1.46 nicm 127: goto failed;
1.49 nicm 128: close(fd);
129:
1.82 nicm 130: if (!locked) {
131: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 132: if ((lockfd = client_get_lock(lockfile)) < 0) {
133: log_debug("didn't get lock (%d)", lockfd);
134:
1.82 nicm 135: free(lockfile);
1.110 nicm 136: lockfile = NULL;
137:
138: if (lockfd == -2)
139: goto retry;
1.82 nicm 140: }
1.110 nicm 141: log_debug("got lock (%d)", lockfd);
1.82 nicm 142:
143: /*
144: * Always retry at least once, even if we got the lock,
145: * because another client could have taken the lock,
146: * started the server and released the lock between our
147: * connect() and flock().
148: */
149: locked = 1;
1.49 nicm 150: goto retry;
1.78 nicm 151: }
1.82 nicm 152:
1.110 nicm 153: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 154: free(lockfile);
155: close(lockfd);
1.49 nicm 156: return (-1);
1.78 nicm 157: }
1.138 nicm 158: fd = server_start(client_proc, flags, base, lockfd, lockfile);
1.82 nicm 159: }
1.95 nicm 160:
1.110 nicm 161: if (locked && lockfd >= 0) {
1.58 nicm 162: free(lockfile);
1.49 nicm 163: close(lockfd);
1.1 nicm 164: }
1.47 nicm 165: setblocking(fd, 0);
1.46 nicm 166: return (fd);
167:
168: failed:
1.95 nicm 169: if (locked) {
170: free(lockfile);
171: close(lockfd);
172: }
1.46 nicm 173: close(fd);
174: return (-1);
175: }
176:
1.52 nicm 177: /* Get exit string from reason number. */
178: const char *
179: client_exit_message(void)
180: {
1.73 nicm 181: static char msg[256];
182:
1.52 nicm 183: switch (client_exitreason) {
184: case CLIENT_EXIT_NONE:
185: break;
186: case CLIENT_EXIT_DETACHED:
1.73 nicm 187: if (client_exitsession != NULL) {
188: xsnprintf(msg, sizeof msg, "detached "
189: "(from session %s)", client_exitsession);
190: return (msg);
191: }
1.52 nicm 192: return ("detached");
193: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 194: if (client_exitsession != NULL) {
195: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
196: "(from session %s)", client_exitsession);
197: return (msg);
198: }
1.52 nicm 199: return ("detached and SIGHUP");
200: case CLIENT_EXIT_LOST_TTY:
201: return ("lost tty");
202: case CLIENT_EXIT_TERMINATED:
203: return ("terminated");
204: case CLIENT_EXIT_LOST_SERVER:
1.131 nicm 205: return ("server exited unexpectedly");
1.52 nicm 206: case CLIENT_EXIT_EXITED:
207: return ("exited");
208: case CLIENT_EXIT_SERVER_EXITED:
209: return ("server exited");
210: }
211: return ("unknown reason");
212: }
213:
1.133 nicm 214: /* Exit if all streams flushed. */
215: static void
216: client_exit(void)
217: {
218: struct client_file *cf;
219: size_t left;
220: int waiting = 0;
221:
222: RB_FOREACH (cf, client_files, &client_files) {
223: if (cf->event == NULL)
224: continue;
225: left = EVBUFFER_LENGTH(cf->event->output);
226: if (left != 0) {
227: waiting++;
228: log_debug("file %u %zu bytes left", cf->stream, left);
229: }
230: }
231: if (waiting == 0)
232: proc_exit(client_proc);
233: }
234:
1.46 nicm 235: /* Client main loop. */
236: int
1.142 nicm 237: client_main(struct event_base *base, int argc, char **argv, int flags, int feat)
1.46 nicm 238: {
1.129 nicm 239: struct cmd_parse_result *pr;
1.132 nicm 240: struct msg_command *data;
1.138 nicm 241: int fd, i;
1.98 nicm 242: const char *ttynam, *cwd;
1.48 nicm 243: pid_t ppid;
1.46 nicm 244: enum msgtype msg;
1.56 nicm 245: struct termios tio, saved_tio;
1.70 nicm 246: size_t size;
1.46 nicm 247:
1.99 nicm 248: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
249: signal(SIGCHLD, SIG_IGN);
250:
1.46 nicm 251: /* Set up the initial command. */
1.121 nicm 252: if (shell_command != NULL) {
1.46 nicm 253: msg = MSG_SHELL;
1.139 nicm 254: flags |= CLIENT_STARTSERVER;
1.46 nicm 255: } else if (argc == 0) {
256: msg = MSG_COMMAND;
1.138 nicm 257: flags |= CLIENT_STARTSERVER;
1.46 nicm 258: } else {
259: msg = MSG_COMMAND;
260:
261: /*
262: * It sucks parsing the command string twice (in client and
263: * later in server) but it is necessary to get the start server
264: * flag.
265: */
1.129 nicm 266: pr = cmd_parse_from_arguments(argc, argv, NULL);
267: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 nicm 268: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
269: flags |= CLIENT_STARTSERVER;
1.129 nicm 270: cmd_list_free(pr->cmdlist);
271: } else
272: free(pr->error);
1.46 nicm 273: }
274:
1.138 nicm 275: /* Save the flags. */
276: client_flags = flags;
277:
1.109 nicm 278: /* Create client process structure (starts logging). */
1.122 nicm 279: client_proc = proc_start("client");
280: proc_set_signals(client_proc, client_signal);
1.109 nicm 281:
1.82 nicm 282: /* Initialize the client socket and start the server. */
1.138 nicm 283: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 284: if (fd == -1) {
1.87 nicm 285: if (errno == ECONNREFUSED) {
286: fprintf(stderr, "no server running on %s\n",
287: socket_path);
288: } else {
289: fprintf(stderr, "error connecting to %s (%s)\n",
290: socket_path, strerror(errno));
291: }
1.46 nicm 292: return (1);
293: }
1.121 nicm 294: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 295:
1.97 nicm 296: /* Save these before pledge(). */
1.128 nicm 297: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 298: cwd = "/";
1.97 nicm 299: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
300: ttynam = "";
301:
302: /*
303: * Drop privileges for client. "proc exec" is needed for -c and for
304: * locking (which uses system(3)).
305: *
306: * "tty" is needed to restore termios(4) and also for some reason -CC
307: * does not work properly without it (input is not recognised).
308: *
309: * "sendfd" is dropped later in client_dispatch_wait().
310: */
1.132 nicm 311: if (pledge(
312: "stdio rpath wpath cpath unix sendfd proc exec tty",
313: NULL) != 0)
1.97 nicm 314: fatal("pledge failed");
315:
316: /* Free stuff that is not used in the client. */
1.119 nicm 317: if (ptm_fd != -1)
318: close(ptm_fd);
1.100 nicm 319: options_free(global_options);
320: options_free(global_s_options);
321: options_free(global_w_options);
1.101 nicm 322: environ_free(global_environ);
1.46 nicm 323:
1.132 nicm 324: /* Set up control mode. */
1.93 nicm 325: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 326: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
327: fprintf(stderr, "tcgetattr failed: %s\n",
328: strerror(errno));
329: return (1);
330: }
1.56 nicm 331: cfmakeraw(&tio);
332: tio.c_iflag = ICRNL|IXANY;
333: tio.c_oflag = OPOST|ONLCR;
334: tio.c_lflag = NOKERNINFO;
335: tio.c_cflag = CREAD|CS8|HUPCL;
336: tio.c_cc[VMIN] = 1;
337: tio.c_cc[VTIME] = 0;
338: cfsetispeed(&tio, cfgetispeed(&saved_tio));
339: cfsetospeed(&tio, cfgetospeed(&saved_tio));
340: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
341: }
1.1 nicm 342:
1.71 nicm 343: /* Send identify messages. */
1.142 nicm 344: client_send_identify(ttynam, cwd, feat);
1.1 nicm 345:
1.46 nicm 346: /* Send first command. */
347: if (msg == MSG_COMMAND) {
1.70 nicm 348: /* How big is the command? */
349: size = 0;
350: for (i = 0; i < argc; i++)
351: size += strlen(argv[i]) + 1;
1.124 nicm 352: if (size > MAX_IMSGSIZE - (sizeof *data)) {
353: fprintf(stderr, "command too long\n");
354: return (1);
355: }
1.70 nicm 356: data = xmalloc((sizeof *data) + size);
1.46 nicm 357:
358: /* Prepare command for server. */
1.70 nicm 359: data->argc = argc;
1.83 nicm 360: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 361: fprintf(stderr, "command too long\n");
1.70 nicm 362: free(data);
1.46 nicm 363: return (1);
364: }
1.70 nicm 365: size += sizeof *data;
1.46 nicm 366:
1.70 nicm 367: /* Send the command. */
1.99 nicm 368: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 369: fprintf(stderr, "failed to send command\n");
370: free(data);
371: return (1);
372: }
373: free(data);
1.46 nicm 374: } else if (msg == MSG_SHELL)
1.99 nicm 375: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 376:
1.99 nicm 377: /* Start main loop. */
378: proc_loop(client_proc, NULL);
1.46 nicm 379:
1.115 nicm 380: /* Run command if user requested exec, instead of exiting. */
381: if (client_exittype == MSG_EXEC) {
382: if (client_flags & CLIENT_CONTROLCONTROL)
383: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
384: client_exec(client_execshell, client_execcmd);
385: }
386:
1.46 nicm 387: /* Print the exit message, if any, and exit. */
1.48 nicm 388: if (client_attached) {
1.93 nicm 389: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 390: printf("[%s]\n", client_exit_message());
1.48 nicm 391:
392: ppid = getppid();
393: if (client_exittype == MSG_DETACHKILL && ppid > 1)
394: kill(ppid, SIGHUP);
1.93 nicm 395: } else if (client_flags & CLIENT_CONTROLCONTROL) {
1.68 nicm 396: if (client_exitreason != CLIENT_EXIT_NONE)
397: printf("%%exit %s\n", client_exit_message());
398: else
399: printf("%%exit\n");
400: printf("\033\\");
1.56 nicm 401: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.112 nicm 402: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 403: fprintf(stderr, "%s\n", client_exit_message());
1.54 nicm 404: setblocking(STDIN_FILENO, 1);
1.145 ! nicm 405: setblocking(STDOUT_FILENO, 1);
! 406: setblocking(STDERR_FILENO, 1);
1.46 nicm 407: return (client_exitval);
1.1 nicm 408: }
409:
1.71 nicm 410: /* Send identify messages to server. */
1.114 nicm 411: static void
1.142 nicm 412: client_send_identify(const char *ttynam, const char *cwd, int feat)
1.26 nicm 413: {
1.90 nicm 414: const char *s;
1.71 nicm 415: char **ss;
1.91 nicm 416: size_t sslen;
1.93 nicm 417: int fd, flags = client_flags;
1.90 nicm 418: pid_t pid;
1.71 nicm 419:
1.99 nicm 420: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 421:
422: if ((s = getenv("TERM")) == NULL)
423: s = "";
1.99 nicm 424: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.142 nicm 425: proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat);
1.71 nicm 426:
1.107 nicm 427: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
428: strlen(ttynam) + 1);
1.99 nicm 429: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 430:
1.50 nicm 431: if ((fd = dup(STDIN_FILENO)) == -1)
432: fatal("dup failed");
1.99 nicm 433: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.145 ! nicm 434: if ((fd = dup(STDOUT_FILENO)) == -1)
! 435: fatal("dup failed");
! 436: proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0);
1.90 nicm 437:
438: pid = getpid();
1.99 nicm 439: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 440:
1.91 nicm 441: for (ss = environ; *ss != NULL; ss++) {
442: sslen = strlen(*ss) + 1;
1.107 nicm 443: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
444: continue;
445: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 446: }
1.75 nicm 447:
1.99 nicm 448: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 449: }
450:
1.132 nicm 451: /* File write error callback. */
1.114 nicm 452: static void
1.132 nicm 453: client_write_error_callback(__unused struct bufferevent *bev,
454: __unused short what, void *arg)
1.54 nicm 455: {
1.132 nicm 456: struct client_file *cf = arg;
1.54 nicm 457:
1.132 nicm 458: log_debug("write error file %d", cf->stream);
459:
460: bufferevent_free(cf->event);
461: cf->event = NULL;
462:
463: close(cf->fd);
464: cf->fd = -1;
1.134 nicm 465:
466: if (client_exitflag)
467: client_exit();
1.132 nicm 468: }
469:
470: /* File write callback. */
471: static void
472: client_write_callback(__unused struct bufferevent *bev, void *arg)
473: {
474: struct client_file *cf = arg;
475:
476: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
477: bufferevent_free(cf->event);
478: close(cf->fd);
479: RB_REMOVE(client_files, &client_files, cf);
480: file_free(cf);
481: }
1.133 nicm 482:
483: if (client_exitflag)
484: client_exit();
1.132 nicm 485: }
486:
487: /* Open write file. */
488: static void
489: client_write_open(void *data, size_t datalen)
490: {
491: struct msg_write_open *msg = data;
1.135 nicm 492: const char *path;
1.132 nicm 493: struct msg_write_ready reply;
494: struct client_file find, *cf;
495: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
496: int error = 0;
497:
1.135 nicm 498: if (datalen < sizeof *msg)
1.132 nicm 499: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 500: if (datalen == sizeof *msg)
501: path = "-";
502: else
503: path = (const char *)(msg + 1);
504: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 505:
506: find.stream = msg->stream;
507: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
508: cf = file_create(NULL, msg->stream, NULL, NULL);
509: RB_INSERT(client_files, &client_files, cf);
510: } else {
511: error = EBADF;
512: goto reply;
513: }
514: if (cf->closed) {
515: error = EBADF;
516: goto reply;
517: }
518:
519: cf->fd = -1;
520: if (msg->fd == -1)
1.135 nicm 521: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 522: else {
523: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
524: errno = EBADF;
525: else {
526: cf->fd = dup(msg->fd);
1.143 nicm 527: if (~client_flags & CLIENT_CONTROL)
1.132 nicm 528: close(msg->fd); /* can only be used once */
529: }
530: }
531: if (cf->fd == -1) {
532: error = errno;
533: goto reply;
534: }
535:
536: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
537: client_write_error_callback, cf);
538: bufferevent_enable(cf->event, EV_WRITE);
539: goto reply;
540:
541: reply:
542: reply.stream = msg->stream;
543: reply.error = error;
544: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
545: }
546:
547: /* Write to client file. */
548: static void
549: client_write_data(void *data, size_t datalen)
550: {
551: struct msg_write_data *msg = data;
552: struct client_file find, *cf;
1.135 nicm 553: size_t size = datalen - sizeof *msg;
1.132 nicm 554:
1.135 nicm 555: if (datalen < sizeof *msg)
1.132 nicm 556: fatalx("bad MSG_WRITE size");
557: find.stream = msg->stream;
558: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
559: fatalx("unknown stream number");
1.135 nicm 560: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 561:
562: if (cf->event != NULL)
1.135 nicm 563: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 564: }
565:
566: /* Close client file. */
567: static void
568: client_write_close(void *data, size_t datalen)
569: {
570: struct msg_write_close *msg = data;
571: struct client_file find, *cf;
1.54 nicm 572:
1.132 nicm 573: if (datalen != sizeof *msg)
574: fatalx("bad MSG_WRITE_CLOSE size");
575: find.stream = msg->stream;
576: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
577: fatalx("unknown stream number");
578: log_debug("close file %d", cf->stream);
579:
580: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
581: if (cf->event != NULL)
582: bufferevent_free(cf->event);
583: if (cf->fd != -1)
584: close(cf->fd);
585: RB_REMOVE(client_files, &client_files, cf);
586: file_free(cf);
587: }
1.54 nicm 588: }
589:
1.132 nicm 590: /* File read callback. */
1.114 nicm 591: static void
1.132 nicm 592: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 593: {
1.132 nicm 594: struct client_file *cf = arg;
595: void *bdata;
596: size_t bsize;
1.135 nicm 597: struct msg_read_data *msg;
598: size_t msglen;
1.132 nicm 599:
1.135 nicm 600: msg = xmalloc(sizeof *msg);
1.132 nicm 601: for (;;) {
602: bdata = EVBUFFER_DATA(cf->event->input);
603: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 604:
1.132 nicm 605: if (bsize == 0)
1.57 nicm 606: break;
1.136 nicm 607: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
608: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 609: log_debug("read %zu from file %d", bsize, cf->stream);
610:
1.135 nicm 611: msglen = (sizeof *msg) + bsize;
612: msg = xrealloc(msg, msglen);
613: msg->stream = cf->stream;
614: memcpy(msg + 1, bdata, bsize);
615: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 616:
617: evbuffer_drain(cf->event->input, bsize);
618: }
1.135 nicm 619: free(msg);
1.132 nicm 620: }
621:
622: /* File read error callback. */
623: static void
624: client_read_error_callback(__unused struct bufferevent *bev,
625: __unused short what, void *arg)
626: {
627: struct client_file *cf = arg;
628: struct msg_read_done msg;
629:
630: log_debug("read error file %d", cf->stream);
631:
632: msg.stream = cf->stream;
633: msg.error = 0;
634: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
635:
636: bufferevent_free(cf->event);
637: close(cf->fd);
638: RB_REMOVE(client_files, &client_files, cf);
639: file_free(cf);
640: }
641:
642: /* Open read file. */
643: static void
644: client_read_open(void *data, size_t datalen)
645: {
646: struct msg_read_open *msg = data;
1.135 nicm 647: const char *path;
1.132 nicm 648: struct msg_read_done reply;
649: struct client_file find, *cf;
650: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 651: int error;
1.132 nicm 652:
1.135 nicm 653: if (datalen < sizeof *msg)
1.132 nicm 654: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 655: if (datalen == sizeof *msg)
656: path = "-";
657: else
658: path = (const char *)(msg + 1);
659: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 660:
661: find.stream = msg->stream;
662: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
663: cf = file_create(NULL, msg->stream, NULL, NULL);
664: RB_INSERT(client_files, &client_files, cf);
665: } else {
666: error = EBADF;
667: goto reply;
1.57 nicm 668: }
1.132 nicm 669: if (cf->closed) {
670: error = EBADF;
671: goto reply;
672: }
673:
674: cf->fd = -1;
675: if (msg->fd == -1)
1.135 nicm 676: cf->fd = open(path, flags);
1.132 nicm 677: else {
678: if (msg->fd != STDIN_FILENO)
679: errno = EBADF;
680: else {
681: cf->fd = dup(msg->fd);
1.143 nicm 682: if (~client_flags & CLIENT_CONTROL)
683: close(msg->fd); /* can only be used once */
1.132 nicm 684: }
685: }
686: if (cf->fd == -1) {
687: error = errno;
688: goto reply;
689: }
690:
691: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
692: client_read_error_callback, cf);
693: bufferevent_enable(cf->event, EV_READ);
694: return;
695:
696: reply:
697: reply.stream = msg->stream;
698: reply.error = error;
699: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 700: }
701:
1.93 nicm 702: /* Run command in shell; used for -c. */
1.114 nicm 703: static __dead void
1.111 nicm 704: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 705: {
706: const char *name, *ptr;
707: char *argv0;
708:
1.111 nicm 709: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 710:
711: ptr = strrchr(shell, '/');
712: if (ptr != NULL && *(ptr + 1) != '\0')
713: name = ptr + 1;
714: else
715: name = shell;
716: if (client_flags & CLIENT_LOGIN)
717: xasprintf(&argv0, "-%s", name);
718: else
719: xasprintf(&argv0, "%s", name);
720: setenv("SHELL", shell, 1);
721:
1.123 nicm 722: proc_clear_signals(client_proc, 1);
723:
1.93 nicm 724: setblocking(STDIN_FILENO, 1);
725: setblocking(STDOUT_FILENO, 1);
726: setblocking(STDERR_FILENO, 1);
727: closefrom(STDERR_FILENO + 1);
728:
1.111 nicm 729: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 730: fatal("execl failed");
731: }
732:
1.99 nicm 733: /* Callback to handle signals in the client. */
1.114 nicm 734: static void
1.99 nicm 735: client_signal(int sig)
736: {
737: struct sigaction sigact;
738: int status;
739:
740: if (sig == SIGCHLD)
741: waitpid(WAIT_ANY, &status, WNOHANG);
742: else if (!client_attached) {
743: if (sig == SIGTERM)
744: proc_exit(client_proc);
745: } else {
746: switch (sig) {
747: case SIGHUP:
748: client_exitreason = CLIENT_EXIT_LOST_TTY;
749: client_exitval = 1;
750: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
751: break;
752: case SIGTERM:
753: client_exitreason = CLIENT_EXIT_TERMINATED;
754: client_exitval = 1;
755: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
756: break;
757: case SIGWINCH:
758: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
759: break;
760: case SIGCONT:
761: memset(&sigact, 0, sizeof sigact);
762: sigemptyset(&sigact.sa_mask);
763: sigact.sa_flags = SA_RESTART;
764: sigact.sa_handler = SIG_IGN;
765: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
766: fatal("sigaction failed");
767: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
768: break;
769: }
770: }
771: }
772:
773: /* Callback for client read events. */
1.114 nicm 774: static void
1.121 nicm 775: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 776: {
777: if (imsg == NULL) {
778: client_exitreason = CLIENT_EXIT_LOST_SERVER;
779: client_exitval = 1;
1.109 nicm 780: proc_exit(client_proc);
781: return;
782: }
783:
784: if (client_attached)
1.99 nicm 785: client_dispatch_attached(imsg);
786: else
1.121 nicm 787: client_dispatch_wait(imsg);
1.99 nicm 788: }
789:
1.46 nicm 790: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 791: static void
1.121 nicm 792: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 793: {
1.132 nicm 794: char *data;
795: ssize_t datalen;
796: int retval;
797: static int pledge_applied;
1.97 nicm 798:
799: /*
800: * "sendfd" is no longer required once all of the identify messages
801: * have been sent. We know the server won't send us anything until that
802: * point (because we don't ask it to), so we can drop "sendfd" once we
803: * get the first message from the server.
804: */
805: if (!pledge_applied) {
1.132 nicm 806: if (pledge(
807: "stdio rpath wpath cpath unix proc exec tty",
808: NULL) != 0)
1.97 nicm 809: fatal("pledge failed");
810: pledge_applied = 1;
1.132 nicm 811: }
1.46 nicm 812:
1.99 nicm 813: data = imsg->data;
814: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 815:
1.99 nicm 816: switch (imsg->hdr.type) {
817: case MSG_EXIT:
818: case MSG_SHUTDOWN:
819: if (datalen != sizeof retval && datalen != 0)
820: fatalx("bad MSG_EXIT size");
821: if (datalen == sizeof retval) {
822: memcpy(&retval, data, sizeof retval);
823: client_exitval = retval;
824: }
1.133 nicm 825: client_exitflag = 1;
826: client_exit();
1.99 nicm 827: break;
828: case MSG_READY:
829: if (datalen != 0)
830: fatalx("bad MSG_READY size");
1.54 nicm 831:
1.99 nicm 832: client_attached = 1;
833: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
834: break;
835: case MSG_VERSION:
836: if (datalen != 0)
837: fatalx("bad MSG_VERSION size");
838:
839: fprintf(stderr, "protocol version mismatch "
840: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 841: imsg->hdr.peerid & 0xff);
1.99 nicm 842: client_exitval = 1;
843: proc_exit(client_proc);
844: break;
845: case MSG_SHELL:
846: if (datalen == 0 || data[datalen - 1] != '\0')
847: fatalx("bad MSG_SHELL string");
848:
1.121 nicm 849: client_exec(data, shell_command);
1.99 nicm 850: /* NOTREACHED */
851: case MSG_DETACH:
852: case MSG_DETACHKILL:
853: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
854: break;
855: case MSG_EXITED:
856: proc_exit(client_proc);
1.132 nicm 857: break;
858: case MSG_READ_OPEN:
859: client_read_open(data, datalen);
860: break;
861: case MSG_WRITE_OPEN:
862: client_write_open(data, datalen);
863: break;
864: case MSG_WRITE:
865: client_write_data(data, datalen);
866: break;
867: case MSG_WRITE_CLOSE:
868: client_write_close(data, datalen);
1.137 nicm 869: break;
870: case MSG_OLDSTDERR:
871: case MSG_OLDSTDIN:
872: case MSG_OLDSTDOUT:
873: fprintf(stderr, "server version is too old for client\n");
874: proc_exit(client_proc);
1.99 nicm 875: break;
1.46 nicm 876: }
877: }
878:
879: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 880: static void
1.99 nicm 881: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 882: {
1.69 nicm 883: struct sigaction sigact;
884: char *data;
1.99 nicm 885: ssize_t datalen;
1.9 nicm 886:
1.99 nicm 887: data = imsg->data;
888: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 889:
1.99 nicm 890: switch (imsg->hdr.type) {
891: case MSG_DETACH:
892: case MSG_DETACHKILL:
893: if (datalen == 0 || data[datalen - 1] != '\0')
894: fatalx("bad MSG_DETACH string");
895:
896: client_exitsession = xstrdup(data);
897: client_exittype = imsg->hdr.type;
898: if (imsg->hdr.type == MSG_DETACHKILL)
899: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
900: else
901: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 902: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
903: break;
904: case MSG_EXEC:
905: if (datalen == 0 || data[datalen - 1] != '\0' ||
906: strlen(data) + 1 == (size_t)datalen)
907: fatalx("bad MSG_EXEC string");
908: client_execcmd = xstrdup(data);
909: client_execshell = xstrdup(data + strlen(data) + 1);
910:
911: client_exittype = imsg->hdr.type;
1.99 nicm 912: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
913: break;
914: case MSG_EXIT:
915: if (datalen != 0 && datalen != sizeof (int))
916: fatalx("bad MSG_EXIT size");
1.9 nicm 917:
1.99 nicm 918: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
919: client_exitreason = CLIENT_EXIT_EXITED;
920: break;
921: case MSG_EXITED:
922: if (datalen != 0)
923: fatalx("bad MSG_EXITED size");
1.9 nicm 924:
1.99 nicm 925: proc_exit(client_proc);
926: break;
927: case MSG_SHUTDOWN:
928: if (datalen != 0)
929: fatalx("bad MSG_SHUTDOWN size");
930:
931: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
932: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
933: client_exitval = 1;
934: break;
935: case MSG_SUSPEND:
936: if (datalen != 0)
937: fatalx("bad MSG_SUSPEND size");
938:
939: memset(&sigact, 0, sizeof sigact);
940: sigemptyset(&sigact.sa_mask);
941: sigact.sa_flags = SA_RESTART;
942: sigact.sa_handler = SIG_DFL;
943: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
944: fatal("sigaction failed");
945: kill(getpid(), SIGTSTP);
946: break;
947: case MSG_LOCK:
948: if (datalen == 0 || data[datalen - 1] != '\0')
949: fatalx("bad MSG_LOCK string");
1.9 nicm 950:
1.99 nicm 951: system(data);
952: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
953: break;
1.9 nicm 954: }
1.1 nicm 955: }
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