Annotation of src/usr.bin/tmux/client.c, Revision 1.149
1.149 ! nicm 1: /* $OpenBSD: client.c,v 1.148 2020/06/18 08:34:22 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;
1.148 nicm 38: static uint64_t client_flags;
1.114 nicm 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,
1.147 nicm 48: CLIENT_EXIT_MESSAGE_PROVIDED
1.52 nicm 49: } client_exitreason = CLIENT_EXIT_NONE;
1.133 nicm 50: static int client_exitflag;
1.114 nicm 51: static int client_exitval;
52: static enum msgtype client_exittype;
53: static const char *client_exitsession;
1.147 nicm 54: static char *client_exitmessage;
1.115 nicm 55: static const char *client_execshell;
56: static const char *client_execcmd;
1.114 nicm 57: static int client_attached;
1.132 nicm 58: static struct client_files client_files = RB_INITIALIZER(&client_files);
1.114 nicm 59:
60: static __dead void client_exec(const char *,const char *);
61: static int client_get_lock(char *);
1.149 ! nicm 62: static int client_connect(struct event_base *, const char *,
! 63: uint64_t);
1.142 nicm 64: static void client_send_identify(const char *, const char *, int);
1.114 nicm 65: static void client_signal(int);
66: static void client_dispatch(struct imsg *, void *);
67: static void client_dispatch_attached(struct imsg *);
1.121 nicm 68: static void client_dispatch_wait(struct imsg *);
1.114 nicm 69: static const char *client_exit_message(void);
1.25 nicm 70:
1.49 nicm 71: /*
72: * Get server create lock. If already held then server start is happening in
1.110 nicm 73: * another client, so block until the lock is released and return -2 to
74: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 75: */
1.114 nicm 76: static int
1.49 nicm 77: client_get_lock(char *lockfile)
78: {
79: int lockfd;
80:
1.110 nicm 81: log_debug("lock file is %s", lockfile);
82:
1.109 nicm 83: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 84: log_debug("open failed: %s", strerror(errno));
85: return (-1);
1.109 nicm 86: }
1.49 nicm 87:
1.82 nicm 88: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
89: log_debug("flock failed: %s", strerror(errno));
90: if (errno != EAGAIN)
91: return (lockfd);
92: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 93: /* nothing */;
94: close(lockfd);
1.110 nicm 95: return (-2);
1.49 nicm 96: }
1.82 nicm 97: log_debug("flock succeeded");
1.49 nicm 98:
99: return (lockfd);
100: }
101:
1.46 nicm 102: /* Connect client to server. */
1.114 nicm 103: static int
1.149 ! nicm 104: client_connect(struct event_base *base, const char *path, uint64_t flags)
1.1 nicm 105: {
1.26 nicm 106: struct sockaddr_un sa;
107: size_t size;
1.82 nicm 108: int fd, lockfd = -1, locked = 0;
109: char *lockfile = NULL;
1.1 nicm 110:
111: memset(&sa, 0, sizeof sa);
112: sa.sun_family = AF_UNIX;
113: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
114: if (size >= sizeof sa.sun_path) {
115: errno = ENAMETOOLONG;
1.46 nicm 116: return (-1);
1.1 nicm 117: }
1.82 nicm 118: log_debug("socket is %s", path);
1.1 nicm 119:
1.49 nicm 120: retry:
1.10 nicm 121: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 122: return (-1);
1.1 nicm 123:
1.82 nicm 124: log_debug("trying connect");
1.109 nicm 125: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 126: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 127: if (errno != ECONNREFUSED && errno != ENOENT)
128: goto failed;
1.138 nicm 129: if (~flags & CLIENT_STARTSERVER)
1.46 nicm 130: goto failed;
1.49 nicm 131: close(fd);
132:
1.82 nicm 133: if (!locked) {
134: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 135: if ((lockfd = client_get_lock(lockfile)) < 0) {
136: log_debug("didn't get lock (%d)", lockfd);
137:
1.82 nicm 138: free(lockfile);
1.110 nicm 139: lockfile = NULL;
140:
141: if (lockfd == -2)
142: goto retry;
1.82 nicm 143: }
1.110 nicm 144: log_debug("got lock (%d)", lockfd);
1.82 nicm 145:
146: /*
147: * Always retry at least once, even if we got the lock,
148: * because another client could have taken the lock,
149: * started the server and released the lock between our
150: * connect() and flock().
151: */
152: locked = 1;
1.49 nicm 153: goto retry;
1.78 nicm 154: }
1.82 nicm 155:
1.110 nicm 156: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 157: free(lockfile);
158: close(lockfd);
1.49 nicm 159: return (-1);
1.78 nicm 160: }
1.138 nicm 161: fd = server_start(client_proc, flags, base, lockfd, lockfile);
1.82 nicm 162: }
1.95 nicm 163:
1.110 nicm 164: if (locked && lockfd >= 0) {
1.58 nicm 165: free(lockfile);
1.49 nicm 166: close(lockfd);
1.1 nicm 167: }
1.47 nicm 168: setblocking(fd, 0);
1.46 nicm 169: return (fd);
170:
171: failed:
1.95 nicm 172: if (locked) {
173: free(lockfile);
174: close(lockfd);
175: }
1.46 nicm 176: close(fd);
177: return (-1);
178: }
179:
1.52 nicm 180: /* Get exit string from reason number. */
181: const char *
182: client_exit_message(void)
183: {
1.73 nicm 184: static char msg[256];
185:
1.52 nicm 186: switch (client_exitreason) {
187: case CLIENT_EXIT_NONE:
188: break;
189: case CLIENT_EXIT_DETACHED:
1.73 nicm 190: if (client_exitsession != NULL) {
191: xsnprintf(msg, sizeof msg, "detached "
192: "(from session %s)", client_exitsession);
193: return (msg);
194: }
1.52 nicm 195: return ("detached");
196: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 197: if (client_exitsession != NULL) {
198: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
199: "(from session %s)", client_exitsession);
200: return (msg);
201: }
1.52 nicm 202: return ("detached and SIGHUP");
203: case CLIENT_EXIT_LOST_TTY:
204: return ("lost tty");
205: case CLIENT_EXIT_TERMINATED:
206: return ("terminated");
207: case CLIENT_EXIT_LOST_SERVER:
1.131 nicm 208: return ("server exited unexpectedly");
1.52 nicm 209: case CLIENT_EXIT_EXITED:
210: return ("exited");
211: case CLIENT_EXIT_SERVER_EXITED:
212: return ("server exited");
1.147 nicm 213: case CLIENT_EXIT_MESSAGE_PROVIDED:
214: return (client_exitmessage);
1.52 nicm 215: }
216: return ("unknown reason");
217: }
218:
1.133 nicm 219: /* Exit if all streams flushed. */
220: static void
221: client_exit(void)
222: {
223: struct client_file *cf;
224: size_t left;
225: int waiting = 0;
226:
227: RB_FOREACH (cf, client_files, &client_files) {
228: if (cf->event == NULL)
229: continue;
230: left = EVBUFFER_LENGTH(cf->event->output);
231: if (left != 0) {
232: waiting++;
233: log_debug("file %u %zu bytes left", cf->stream, left);
234: }
235: }
236: if (waiting == 0)
237: proc_exit(client_proc);
238: }
239:
1.46 nicm 240: /* Client main loop. */
241: int
1.149 ! nicm 242: client_main(struct event_base *base, int argc, char **argv, uint64_t flags,
! 243: int feat)
1.46 nicm 244: {
1.129 nicm 245: struct cmd_parse_result *pr;
1.132 nicm 246: struct msg_command *data;
1.138 nicm 247: int fd, i;
1.98 nicm 248: const char *ttynam, *cwd;
1.48 nicm 249: pid_t ppid;
1.46 nicm 250: enum msgtype msg;
1.56 nicm 251: struct termios tio, saved_tio;
1.148 nicm 252: size_t size, linesize = 0;
253: ssize_t linelen;
254: char *line = NULL;
1.46 nicm 255:
1.99 nicm 256: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
257: signal(SIGCHLD, SIG_IGN);
258:
1.46 nicm 259: /* Set up the initial command. */
1.121 nicm 260: if (shell_command != NULL) {
1.46 nicm 261: msg = MSG_SHELL;
1.139 nicm 262: flags |= CLIENT_STARTSERVER;
1.46 nicm 263: } else if (argc == 0) {
264: msg = MSG_COMMAND;
1.138 nicm 265: flags |= CLIENT_STARTSERVER;
1.46 nicm 266: } else {
267: msg = MSG_COMMAND;
268:
269: /*
270: * It sucks parsing the command string twice (in client and
271: * later in server) but it is necessary to get the start server
272: * flag.
273: */
1.129 nicm 274: pr = cmd_parse_from_arguments(argc, argv, NULL);
275: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 nicm 276: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
277: flags |= CLIENT_STARTSERVER;
1.129 nicm 278: cmd_list_free(pr->cmdlist);
279: } else
280: free(pr->error);
1.46 nicm 281: }
282:
1.109 nicm 283: /* Create client process structure (starts logging). */
1.122 nicm 284: client_proc = proc_start("client");
285: proc_set_signals(client_proc, client_signal);
1.109 nicm 286:
1.148 nicm 287: /* Save the flags. */
288: client_flags = flags;
1.149 ! nicm 289: log_debug("flags are %#llx", (unsigned long long)client_flags);
1.148 nicm 290:
1.82 nicm 291: /* Initialize the client socket and start the server. */
1.138 nicm 292: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 293: if (fd == -1) {
1.87 nicm 294: if (errno == ECONNREFUSED) {
295: fprintf(stderr, "no server running on %s\n",
296: socket_path);
297: } else {
298: fprintf(stderr, "error connecting to %s (%s)\n",
299: socket_path, strerror(errno));
300: }
1.46 nicm 301: return (1);
302: }
1.121 nicm 303: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 304:
1.97 nicm 305: /* Save these before pledge(). */
1.128 nicm 306: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 307: cwd = "/";
1.97 nicm 308: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
309: ttynam = "";
310:
311: /*
312: * Drop privileges for client. "proc exec" is needed for -c and for
313: * locking (which uses system(3)).
314: *
315: * "tty" is needed to restore termios(4) and also for some reason -CC
316: * does not work properly without it (input is not recognised).
317: *
318: * "sendfd" is dropped later in client_dispatch_wait().
319: */
1.132 nicm 320: if (pledge(
321: "stdio rpath wpath cpath unix sendfd proc exec tty",
322: NULL) != 0)
1.97 nicm 323: fatal("pledge failed");
324:
325: /* Free stuff that is not used in the client. */
1.119 nicm 326: if (ptm_fd != -1)
327: close(ptm_fd);
1.100 nicm 328: options_free(global_options);
329: options_free(global_s_options);
330: options_free(global_w_options);
1.101 nicm 331: environ_free(global_environ);
1.46 nicm 332:
1.132 nicm 333: /* Set up control mode. */
1.93 nicm 334: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 335: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
336: fprintf(stderr, "tcgetattr failed: %s\n",
337: strerror(errno));
338: return (1);
339: }
1.56 nicm 340: cfmakeraw(&tio);
341: tio.c_iflag = ICRNL|IXANY;
342: tio.c_oflag = OPOST|ONLCR;
343: tio.c_lflag = NOKERNINFO;
344: tio.c_cflag = CREAD|CS8|HUPCL;
345: tio.c_cc[VMIN] = 1;
346: tio.c_cc[VTIME] = 0;
347: cfsetispeed(&tio, cfgetispeed(&saved_tio));
348: cfsetospeed(&tio, cfgetospeed(&saved_tio));
349: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
350: }
1.1 nicm 351:
1.71 nicm 352: /* Send identify messages. */
1.142 nicm 353: client_send_identify(ttynam, cwd, feat);
1.1 nicm 354:
1.46 nicm 355: /* Send first command. */
356: if (msg == MSG_COMMAND) {
1.70 nicm 357: /* How big is the command? */
358: size = 0;
359: for (i = 0; i < argc; i++)
360: size += strlen(argv[i]) + 1;
1.124 nicm 361: if (size > MAX_IMSGSIZE - (sizeof *data)) {
362: fprintf(stderr, "command too long\n");
363: return (1);
364: }
1.70 nicm 365: data = xmalloc((sizeof *data) + size);
1.46 nicm 366:
367: /* Prepare command for server. */
1.70 nicm 368: data->argc = argc;
1.83 nicm 369: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 370: fprintf(stderr, "command too long\n");
1.70 nicm 371: free(data);
1.46 nicm 372: return (1);
373: }
1.70 nicm 374: size += sizeof *data;
1.46 nicm 375:
1.70 nicm 376: /* Send the command. */
1.99 nicm 377: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 378: fprintf(stderr, "failed to send command\n");
379: free(data);
380: return (1);
381: }
382: free(data);
1.46 nicm 383: } else if (msg == MSG_SHELL)
1.99 nicm 384: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 385:
1.99 nicm 386: /* Start main loop. */
387: proc_loop(client_proc, NULL);
1.46 nicm 388:
1.115 nicm 389: /* Run command if user requested exec, instead of exiting. */
390: if (client_exittype == MSG_EXEC) {
391: if (client_flags & CLIENT_CONTROLCONTROL)
392: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
393: client_exec(client_execshell, client_execcmd);
394: }
395:
1.146 nicm 396: /* Restore streams to blocking. */
397: setblocking(STDIN_FILENO, 1);
398: setblocking(STDOUT_FILENO, 1);
399: setblocking(STDERR_FILENO, 1);
400:
1.46 nicm 401: /* Print the exit message, if any, and exit. */
1.48 nicm 402: if (client_attached) {
1.93 nicm 403: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 404: printf("[%s]\n", client_exit_message());
1.48 nicm 405:
406: ppid = getppid();
407: if (client_exittype == MSG_DETACHKILL && ppid > 1)
408: kill(ppid, SIGHUP);
1.146 nicm 409: } else if (client_flags & CLIENT_CONTROL) {
1.68 nicm 410: if (client_exitreason != CLIENT_EXIT_NONE)
411: printf("%%exit %s\n", client_exit_message());
412: else
413: printf("%%exit\n");
1.148 nicm 414: fflush(stdout);
415: if (client_flags & CLIENT_CONTROL_WAITEXIT) {
416: setvbuf(stdin, NULL, _IOLBF, 0);
417: for (;;) {
418: linelen = getline(&line, &linesize, stdin);
419: if (linelen <= 1)
420: break;
421: }
422: free(line);
423: }
1.146 nicm 424: if (client_flags & CLIENT_CONTROLCONTROL) {
425: printf("\033\\");
1.148 nicm 426: fflush(stdout);
1.146 nicm 427: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
428: }
1.112 nicm 429: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 430: fprintf(stderr, "%s\n", client_exit_message());
1.46 nicm 431: return (client_exitval);
1.1 nicm 432: }
433:
1.71 nicm 434: /* Send identify messages to server. */
1.114 nicm 435: static void
1.142 nicm 436: client_send_identify(const char *ttynam, const char *cwd, int feat)
1.26 nicm 437: {
1.90 nicm 438: const char *s;
1.71 nicm 439: char **ss;
1.91 nicm 440: size_t sslen;
1.93 nicm 441: int fd, flags = client_flags;
1.90 nicm 442: pid_t pid;
1.71 nicm 443:
1.99 nicm 444: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.149 ! nicm 445: proc_send(client_peer, MSG_IDENTIFY_LONGFLAGS, -1, &client_flags,
! 446: sizeof client_flags);
1.71 nicm 447:
448: if ((s = getenv("TERM")) == NULL)
449: s = "";
1.99 nicm 450: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.142 nicm 451: proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat);
1.71 nicm 452:
1.107 nicm 453: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
454: strlen(ttynam) + 1);
1.99 nicm 455: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 456:
1.50 nicm 457: if ((fd = dup(STDIN_FILENO)) == -1)
458: fatal("dup failed");
1.99 nicm 459: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.145 nicm 460: if ((fd = dup(STDOUT_FILENO)) == -1)
461: fatal("dup failed");
462: proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0);
1.90 nicm 463:
464: pid = getpid();
1.99 nicm 465: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 466:
1.91 nicm 467: for (ss = environ; *ss != NULL; ss++) {
468: sslen = strlen(*ss) + 1;
1.107 nicm 469: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
470: continue;
471: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 472: }
1.75 nicm 473:
1.99 nicm 474: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 475: }
476:
1.132 nicm 477: /* File write error callback. */
1.114 nicm 478: static void
1.132 nicm 479: client_write_error_callback(__unused struct bufferevent *bev,
480: __unused short what, void *arg)
1.54 nicm 481: {
1.132 nicm 482: struct client_file *cf = arg;
1.54 nicm 483:
1.132 nicm 484: log_debug("write error file %d", cf->stream);
485:
486: bufferevent_free(cf->event);
487: cf->event = NULL;
488:
489: close(cf->fd);
490: cf->fd = -1;
1.134 nicm 491:
492: if (client_exitflag)
493: client_exit();
1.132 nicm 494: }
495:
496: /* File write callback. */
497: static void
498: client_write_callback(__unused struct bufferevent *bev, void *arg)
499: {
500: struct client_file *cf = arg;
501:
502: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
503: bufferevent_free(cf->event);
504: close(cf->fd);
505: RB_REMOVE(client_files, &client_files, cf);
506: file_free(cf);
507: }
1.133 nicm 508:
509: if (client_exitflag)
510: client_exit();
1.132 nicm 511: }
512:
513: /* Open write file. */
514: static void
515: client_write_open(void *data, size_t datalen)
516: {
517: struct msg_write_open *msg = data;
1.135 nicm 518: const char *path;
1.132 nicm 519: struct msg_write_ready reply;
520: struct client_file find, *cf;
521: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
522: int error = 0;
523:
1.135 nicm 524: if (datalen < sizeof *msg)
1.132 nicm 525: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 526: if (datalen == sizeof *msg)
527: path = "-";
528: else
529: path = (const char *)(msg + 1);
530: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 531:
532: find.stream = msg->stream;
533: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
534: cf = file_create(NULL, msg->stream, NULL, NULL);
535: RB_INSERT(client_files, &client_files, cf);
536: } else {
537: error = EBADF;
538: goto reply;
539: }
540: if (cf->closed) {
541: error = EBADF;
542: goto reply;
543: }
544:
545: cf->fd = -1;
546: if (msg->fd == -1)
1.135 nicm 547: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 548: else {
549: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
550: errno = EBADF;
551: else {
552: cf->fd = dup(msg->fd);
1.143 nicm 553: if (~client_flags & CLIENT_CONTROL)
1.132 nicm 554: close(msg->fd); /* can only be used once */
555: }
556: }
557: if (cf->fd == -1) {
558: error = errno;
559: goto reply;
560: }
561:
562: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
563: client_write_error_callback, cf);
564: bufferevent_enable(cf->event, EV_WRITE);
565: goto reply;
566:
567: reply:
568: reply.stream = msg->stream;
569: reply.error = error;
570: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
571: }
572:
573: /* Write to client file. */
574: static void
575: client_write_data(void *data, size_t datalen)
576: {
577: struct msg_write_data *msg = data;
578: struct client_file find, *cf;
1.135 nicm 579: size_t size = datalen - sizeof *msg;
1.132 nicm 580:
1.135 nicm 581: if (datalen < sizeof *msg)
1.132 nicm 582: fatalx("bad MSG_WRITE size");
583: find.stream = msg->stream;
584: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
585: fatalx("unknown stream number");
1.135 nicm 586: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 587:
588: if (cf->event != NULL)
1.135 nicm 589: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 590: }
591:
592: /* Close client file. */
593: static void
594: client_write_close(void *data, size_t datalen)
595: {
596: struct msg_write_close *msg = data;
597: struct client_file find, *cf;
1.54 nicm 598:
1.132 nicm 599: if (datalen != sizeof *msg)
600: fatalx("bad MSG_WRITE_CLOSE size");
601: find.stream = msg->stream;
602: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
603: fatalx("unknown stream number");
604: log_debug("close file %d", cf->stream);
605:
606: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
607: if (cf->event != NULL)
608: bufferevent_free(cf->event);
609: if (cf->fd != -1)
610: close(cf->fd);
611: RB_REMOVE(client_files, &client_files, cf);
612: file_free(cf);
613: }
1.54 nicm 614: }
615:
1.132 nicm 616: /* File read callback. */
1.114 nicm 617: static void
1.132 nicm 618: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 619: {
1.132 nicm 620: struct client_file *cf = arg;
621: void *bdata;
622: size_t bsize;
1.135 nicm 623: struct msg_read_data *msg;
624: size_t msglen;
1.132 nicm 625:
1.135 nicm 626: msg = xmalloc(sizeof *msg);
1.132 nicm 627: for (;;) {
628: bdata = EVBUFFER_DATA(cf->event->input);
629: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 630:
1.132 nicm 631: if (bsize == 0)
1.57 nicm 632: break;
1.136 nicm 633: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
634: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 635: log_debug("read %zu from file %d", bsize, cf->stream);
636:
1.135 nicm 637: msglen = (sizeof *msg) + bsize;
638: msg = xrealloc(msg, msglen);
639: msg->stream = cf->stream;
640: memcpy(msg + 1, bdata, bsize);
641: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 642:
643: evbuffer_drain(cf->event->input, bsize);
644: }
1.135 nicm 645: free(msg);
1.132 nicm 646: }
647:
648: /* File read error callback. */
649: static void
650: client_read_error_callback(__unused struct bufferevent *bev,
651: __unused short what, void *arg)
652: {
653: struct client_file *cf = arg;
654: struct msg_read_done msg;
655:
656: log_debug("read error file %d", cf->stream);
657:
658: msg.stream = cf->stream;
659: msg.error = 0;
660: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
661:
662: bufferevent_free(cf->event);
663: close(cf->fd);
664: RB_REMOVE(client_files, &client_files, cf);
665: file_free(cf);
666: }
667:
668: /* Open read file. */
669: static void
670: client_read_open(void *data, size_t datalen)
671: {
672: struct msg_read_open *msg = data;
1.135 nicm 673: const char *path;
1.132 nicm 674: struct msg_read_done reply;
675: struct client_file find, *cf;
676: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 677: int error;
1.132 nicm 678:
1.135 nicm 679: if (datalen < sizeof *msg)
1.132 nicm 680: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 681: if (datalen == sizeof *msg)
682: path = "-";
683: else
684: path = (const char *)(msg + 1);
685: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 686:
687: find.stream = msg->stream;
688: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
689: cf = file_create(NULL, msg->stream, NULL, NULL);
690: RB_INSERT(client_files, &client_files, cf);
691: } else {
692: error = EBADF;
693: goto reply;
1.57 nicm 694: }
1.132 nicm 695: if (cf->closed) {
696: error = EBADF;
697: goto reply;
698: }
699:
700: cf->fd = -1;
701: if (msg->fd == -1)
1.135 nicm 702: cf->fd = open(path, flags);
1.132 nicm 703: else {
704: if (msg->fd != STDIN_FILENO)
705: errno = EBADF;
706: else {
707: cf->fd = dup(msg->fd);
1.143 nicm 708: if (~client_flags & CLIENT_CONTROL)
709: close(msg->fd); /* can only be used once */
1.132 nicm 710: }
711: }
712: if (cf->fd == -1) {
713: error = errno;
714: goto reply;
715: }
716:
717: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
718: client_read_error_callback, cf);
719: bufferevent_enable(cf->event, EV_READ);
720: return;
721:
722: reply:
723: reply.stream = msg->stream;
724: reply.error = error;
725: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 726: }
727:
1.93 nicm 728: /* Run command in shell; used for -c. */
1.114 nicm 729: static __dead void
1.111 nicm 730: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 731: {
732: const char *name, *ptr;
733: char *argv0;
734:
1.111 nicm 735: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 736:
737: ptr = strrchr(shell, '/');
738: if (ptr != NULL && *(ptr + 1) != '\0')
739: name = ptr + 1;
740: else
741: name = shell;
742: if (client_flags & CLIENT_LOGIN)
743: xasprintf(&argv0, "-%s", name);
744: else
745: xasprintf(&argv0, "%s", name);
746: setenv("SHELL", shell, 1);
747:
1.123 nicm 748: proc_clear_signals(client_proc, 1);
749:
1.93 nicm 750: setblocking(STDIN_FILENO, 1);
751: setblocking(STDOUT_FILENO, 1);
752: setblocking(STDERR_FILENO, 1);
753: closefrom(STDERR_FILENO + 1);
754:
1.111 nicm 755: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 756: fatal("execl failed");
757: }
758:
1.99 nicm 759: /* Callback to handle signals in the client. */
1.114 nicm 760: static void
1.99 nicm 761: client_signal(int sig)
762: {
763: struct sigaction sigact;
764: int status;
765:
766: if (sig == SIGCHLD)
767: waitpid(WAIT_ANY, &status, WNOHANG);
768: else if (!client_attached) {
769: if (sig == SIGTERM)
770: proc_exit(client_proc);
771: } else {
772: switch (sig) {
773: case SIGHUP:
774: client_exitreason = CLIENT_EXIT_LOST_TTY;
775: client_exitval = 1;
776: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
777: break;
778: case SIGTERM:
779: client_exitreason = CLIENT_EXIT_TERMINATED;
780: client_exitval = 1;
781: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
782: break;
783: case SIGWINCH:
784: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
785: break;
786: case SIGCONT:
787: memset(&sigact, 0, sizeof sigact);
788: sigemptyset(&sigact.sa_mask);
789: sigact.sa_flags = SA_RESTART;
790: sigact.sa_handler = SIG_IGN;
791: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
792: fatal("sigaction failed");
793: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
794: break;
795: }
796: }
797: }
798:
799: /* Callback for client read events. */
1.114 nicm 800: static void
1.121 nicm 801: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 802: {
803: if (imsg == NULL) {
804: client_exitreason = CLIENT_EXIT_LOST_SERVER;
805: client_exitval = 1;
1.109 nicm 806: proc_exit(client_proc);
807: return;
808: }
809:
810: if (client_attached)
1.99 nicm 811: client_dispatch_attached(imsg);
812: else
1.121 nicm 813: client_dispatch_wait(imsg);
1.99 nicm 814: }
815:
1.147 nicm 816: /* Process an exit message. */
817: static void
818: client_dispatch_exit_message(char *data, size_t datalen)
819: {
820: int retval;
821:
822: if (datalen < sizeof retval && datalen != 0)
823: fatalx("bad MSG_EXIT size");
824:
825: if (datalen >= sizeof retval) {
826: memcpy(&retval, data, sizeof retval);
827: client_exitval = retval;
828: }
829:
830: if (datalen > sizeof retval) {
831: datalen -= sizeof retval;
832: data += sizeof retval;
833:
834: client_exitmessage = xmalloc(datalen);
835: memcpy(client_exitmessage, data, datalen);
836: client_exitmessage[datalen - 1] = '\0';
837:
838: client_exitreason = CLIENT_EXIT_MESSAGE_PROVIDED;
839: }
840: }
841:
1.46 nicm 842: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 843: static void
1.121 nicm 844: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 845: {
1.132 nicm 846: char *data;
847: ssize_t datalen;
848: static int pledge_applied;
1.97 nicm 849:
850: /*
851: * "sendfd" is no longer required once all of the identify messages
852: * have been sent. We know the server won't send us anything until that
853: * point (because we don't ask it to), so we can drop "sendfd" once we
854: * get the first message from the server.
855: */
856: if (!pledge_applied) {
1.132 nicm 857: if (pledge(
858: "stdio rpath wpath cpath unix proc exec tty",
859: NULL) != 0)
1.97 nicm 860: fatal("pledge failed");
861: pledge_applied = 1;
1.132 nicm 862: }
1.46 nicm 863:
1.99 nicm 864: data = imsg->data;
865: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 866:
1.99 nicm 867: switch (imsg->hdr.type) {
868: case MSG_EXIT:
869: case MSG_SHUTDOWN:
1.147 nicm 870: client_dispatch_exit_message(data, datalen);
1.133 nicm 871: client_exitflag = 1;
872: client_exit();
1.99 nicm 873: break;
874: case MSG_READY:
875: if (datalen != 0)
876: fatalx("bad MSG_READY size");
1.54 nicm 877:
1.99 nicm 878: client_attached = 1;
879: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
880: break;
881: case MSG_VERSION:
882: if (datalen != 0)
883: fatalx("bad MSG_VERSION size");
884:
885: fprintf(stderr, "protocol version mismatch "
886: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 887: imsg->hdr.peerid & 0xff);
1.99 nicm 888: client_exitval = 1;
889: proc_exit(client_proc);
890: break;
1.148 nicm 891: case MSG_FLAGS:
892: if (datalen != sizeof client_flags)
893: fatalx("bad MSG_FLAGS string");
894:
895: memcpy(&client_flags, data, sizeof client_flags);
1.149 ! nicm 896: log_debug("new flags are %#llx",
! 897: (unsigned long long)client_flags);
1.148 nicm 898: break;
1.99 nicm 899: case MSG_SHELL:
900: if (datalen == 0 || data[datalen - 1] != '\0')
901: fatalx("bad MSG_SHELL string");
902:
1.121 nicm 903: client_exec(data, shell_command);
1.99 nicm 904: /* NOTREACHED */
905: case MSG_DETACH:
906: case MSG_DETACHKILL:
907: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
908: break;
909: case MSG_EXITED:
910: proc_exit(client_proc);
1.132 nicm 911: break;
912: case MSG_READ_OPEN:
913: client_read_open(data, datalen);
914: break;
915: case MSG_WRITE_OPEN:
916: client_write_open(data, datalen);
917: break;
918: case MSG_WRITE:
919: client_write_data(data, datalen);
920: break;
921: case MSG_WRITE_CLOSE:
922: client_write_close(data, datalen);
1.137 nicm 923: break;
924: case MSG_OLDSTDERR:
925: case MSG_OLDSTDIN:
926: case MSG_OLDSTDOUT:
927: fprintf(stderr, "server version is too old for client\n");
928: proc_exit(client_proc);
1.99 nicm 929: break;
1.46 nicm 930: }
931: }
932:
933: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 934: static void
1.99 nicm 935: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 936: {
1.69 nicm 937: struct sigaction sigact;
938: char *data;
1.99 nicm 939: ssize_t datalen;
1.9 nicm 940:
1.99 nicm 941: data = imsg->data;
942: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 943:
1.99 nicm 944: switch (imsg->hdr.type) {
1.148 nicm 945: case MSG_FLAGS:
946: if (datalen != sizeof client_flags)
947: fatalx("bad MSG_FLAGS string");
948:
949: memcpy(&client_flags, data, sizeof client_flags);
1.149 ! nicm 950: log_debug("new flags are %#llx",
! 951: (unsigned long long)client_flags);
1.148 nicm 952: break;
1.99 nicm 953: case MSG_DETACH:
954: case MSG_DETACHKILL:
955: if (datalen == 0 || data[datalen - 1] != '\0')
956: fatalx("bad MSG_DETACH string");
957:
958: client_exitsession = xstrdup(data);
959: client_exittype = imsg->hdr.type;
960: if (imsg->hdr.type == MSG_DETACHKILL)
961: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
962: else
963: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 964: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
965: break;
966: case MSG_EXEC:
967: if (datalen == 0 || data[datalen - 1] != '\0' ||
968: strlen(data) + 1 == (size_t)datalen)
969: fatalx("bad MSG_EXEC string");
970: client_execcmd = xstrdup(data);
971: client_execshell = xstrdup(data + strlen(data) + 1);
972:
973: client_exittype = imsg->hdr.type;
1.99 nicm 974: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
975: break;
976: case MSG_EXIT:
1.147 nicm 977: client_dispatch_exit_message(data, datalen);
978: if (client_exitreason == CLIENT_EXIT_NONE)
979: client_exitreason = CLIENT_EXIT_EXITED;
1.99 nicm 980: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
981: break;
982: case MSG_EXITED:
983: if (datalen != 0)
984: fatalx("bad MSG_EXITED size");
1.9 nicm 985:
1.99 nicm 986: proc_exit(client_proc);
987: break;
988: case MSG_SHUTDOWN:
989: if (datalen != 0)
990: fatalx("bad MSG_SHUTDOWN size");
991:
992: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
993: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
994: client_exitval = 1;
995: break;
996: case MSG_SUSPEND:
997: if (datalen != 0)
998: fatalx("bad MSG_SUSPEND size");
999:
1000: memset(&sigact, 0, sizeof sigact);
1001: sigemptyset(&sigact.sa_mask);
1002: sigact.sa_flags = SA_RESTART;
1003: sigact.sa_handler = SIG_DFL;
1004: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
1005: fatal("sigaction failed");
1006: kill(getpid(), SIGTSTP);
1007: break;
1008: case MSG_LOCK:
1009: if (datalen == 0 || data[datalen - 1] != '\0')
1010: fatalx("bad MSG_LOCK string");
1.9 nicm 1011:
1.99 nicm 1012: system(data);
1013: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
1014: break;
1.9 nicm 1015: }
1.1 nicm 1016: }
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