Annotation of src/usr.bin/tmux/client.c, Revision 1.150
1.150 ! nicm 1: /* $OpenBSD: client.c,v 1.149 2020/09/22 05:23:34 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;
1.150 ! nicm 39: static int client_suspended;
1.114 nicm 40: static enum {
1.52 nicm 41: CLIENT_EXIT_NONE,
42: CLIENT_EXIT_DETACHED,
43: CLIENT_EXIT_DETACHED_HUP,
44: CLIENT_EXIT_LOST_TTY,
45: CLIENT_EXIT_TERMINATED,
46: CLIENT_EXIT_LOST_SERVER,
47: CLIENT_EXIT_EXITED,
48: CLIENT_EXIT_SERVER_EXITED,
1.147 nicm 49: CLIENT_EXIT_MESSAGE_PROVIDED
1.52 nicm 50: } client_exitreason = CLIENT_EXIT_NONE;
1.133 nicm 51: static int client_exitflag;
1.114 nicm 52: static int client_exitval;
53: static enum msgtype client_exittype;
54: static const char *client_exitsession;
1.147 nicm 55: static char *client_exitmessage;
1.115 nicm 56: static const char *client_execshell;
57: static const char *client_execcmd;
1.114 nicm 58: static int client_attached;
1.132 nicm 59: static struct client_files client_files = RB_INITIALIZER(&client_files);
1.114 nicm 60:
61: static __dead void client_exec(const char *,const char *);
62: static int client_get_lock(char *);
1.149 nicm 63: static int client_connect(struct event_base *, const char *,
64: uint64_t);
1.142 nicm 65: static void client_send_identify(const char *, const char *, int);
1.114 nicm 66: static void client_signal(int);
67: static void client_dispatch(struct imsg *, void *);
68: static void client_dispatch_attached(struct imsg *);
1.121 nicm 69: static void client_dispatch_wait(struct imsg *);
1.114 nicm 70: static const char *client_exit_message(void);
1.25 nicm 71:
1.49 nicm 72: /*
73: * Get server create lock. If already held then server start is happening in
1.110 nicm 74: * another client, so block until the lock is released and return -2 to
75: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 76: */
1.114 nicm 77: static int
1.49 nicm 78: client_get_lock(char *lockfile)
79: {
80: int lockfd;
81:
1.110 nicm 82: log_debug("lock file is %s", lockfile);
83:
1.109 nicm 84: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 85: log_debug("open failed: %s", strerror(errno));
86: return (-1);
1.109 nicm 87: }
1.49 nicm 88:
1.82 nicm 89: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
90: log_debug("flock failed: %s", strerror(errno));
91: if (errno != EAGAIN)
92: return (lockfd);
93: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 94: /* nothing */;
95: close(lockfd);
1.110 nicm 96: return (-2);
1.49 nicm 97: }
1.82 nicm 98: log_debug("flock succeeded");
1.49 nicm 99:
100: return (lockfd);
101: }
102:
1.46 nicm 103: /* Connect client to server. */
1.114 nicm 104: static int
1.149 nicm 105: client_connect(struct event_base *base, const char *path, uint64_t flags)
1.1 nicm 106: {
1.26 nicm 107: struct sockaddr_un sa;
108: size_t size;
1.82 nicm 109: int fd, lockfd = -1, locked = 0;
110: char *lockfile = NULL;
1.1 nicm 111:
112: memset(&sa, 0, sizeof sa);
113: sa.sun_family = AF_UNIX;
114: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
115: if (size >= sizeof sa.sun_path) {
116: errno = ENAMETOOLONG;
1.46 nicm 117: return (-1);
1.1 nicm 118: }
1.82 nicm 119: log_debug("socket is %s", path);
1.1 nicm 120:
1.49 nicm 121: retry:
1.10 nicm 122: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 123: return (-1);
1.1 nicm 124:
1.82 nicm 125: log_debug("trying connect");
1.109 nicm 126: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 127: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 128: if (errno != ECONNREFUSED && errno != ENOENT)
129: goto failed;
1.138 nicm 130: if (~flags & CLIENT_STARTSERVER)
1.46 nicm 131: goto failed;
1.49 nicm 132: close(fd);
133:
1.82 nicm 134: if (!locked) {
135: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 136: if ((lockfd = client_get_lock(lockfile)) < 0) {
137: log_debug("didn't get lock (%d)", lockfd);
138:
1.82 nicm 139: free(lockfile);
1.110 nicm 140: lockfile = NULL;
141:
142: if (lockfd == -2)
143: goto retry;
1.82 nicm 144: }
1.110 nicm 145: log_debug("got lock (%d)", lockfd);
1.82 nicm 146:
147: /*
148: * Always retry at least once, even if we got the lock,
149: * because another client could have taken the lock,
150: * started the server and released the lock between our
151: * connect() and flock().
152: */
153: locked = 1;
1.49 nicm 154: goto retry;
1.78 nicm 155: }
1.82 nicm 156:
1.110 nicm 157: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 158: free(lockfile);
159: close(lockfd);
1.49 nicm 160: return (-1);
1.78 nicm 161: }
1.138 nicm 162: fd = server_start(client_proc, flags, base, lockfd, lockfile);
1.82 nicm 163: }
1.95 nicm 164:
1.110 nicm 165: if (locked && lockfd >= 0) {
1.58 nicm 166: free(lockfile);
1.49 nicm 167: close(lockfd);
1.1 nicm 168: }
1.47 nicm 169: setblocking(fd, 0);
1.46 nicm 170: return (fd);
171:
172: failed:
1.95 nicm 173: if (locked) {
174: free(lockfile);
175: close(lockfd);
176: }
1.46 nicm 177: close(fd);
178: return (-1);
179: }
180:
1.52 nicm 181: /* Get exit string from reason number. */
182: const char *
183: client_exit_message(void)
184: {
1.73 nicm 185: static char msg[256];
186:
1.52 nicm 187: switch (client_exitreason) {
188: case CLIENT_EXIT_NONE:
189: break;
190: case CLIENT_EXIT_DETACHED:
1.73 nicm 191: if (client_exitsession != NULL) {
192: xsnprintf(msg, sizeof msg, "detached "
193: "(from session %s)", client_exitsession);
194: return (msg);
195: }
1.52 nicm 196: return ("detached");
197: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 198: if (client_exitsession != NULL) {
199: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
200: "(from session %s)", client_exitsession);
201: return (msg);
202: }
1.52 nicm 203: return ("detached and SIGHUP");
204: case CLIENT_EXIT_LOST_TTY:
205: return ("lost tty");
206: case CLIENT_EXIT_TERMINATED:
207: return ("terminated");
208: case CLIENT_EXIT_LOST_SERVER:
1.131 nicm 209: return ("server exited unexpectedly");
1.52 nicm 210: case CLIENT_EXIT_EXITED:
211: return ("exited");
212: case CLIENT_EXIT_SERVER_EXITED:
213: return ("server exited");
1.147 nicm 214: case CLIENT_EXIT_MESSAGE_PROVIDED:
215: return (client_exitmessage);
1.52 nicm 216: }
217: return ("unknown reason");
218: }
219:
1.133 nicm 220: /* Exit if all streams flushed. */
221: static void
222: client_exit(void)
223: {
224: struct client_file *cf;
1.150 ! nicm 225: size_t left;
1.133 nicm 226: int waiting = 0;
227:
228: RB_FOREACH (cf, client_files, &client_files) {
229: if (cf->event == NULL)
230: continue;
231: left = EVBUFFER_LENGTH(cf->event->output);
232: if (left != 0) {
233: waiting++;
234: log_debug("file %u %zu bytes left", cf->stream, left);
235: }
236: }
237: if (waiting == 0)
238: proc_exit(client_proc);
239: }
240:
1.46 nicm 241: /* Client main loop. */
242: int
1.149 nicm 243: client_main(struct event_base *base, int argc, char **argv, uint64_t flags,
244: int feat)
1.46 nicm 245: {
1.129 nicm 246: struct cmd_parse_result *pr;
1.132 nicm 247: struct msg_command *data;
1.138 nicm 248: int fd, i;
1.98 nicm 249: const char *ttynam, *cwd;
1.48 nicm 250: pid_t ppid;
1.46 nicm 251: enum msgtype msg;
1.56 nicm 252: struct termios tio, saved_tio;
1.148 nicm 253: size_t size, linesize = 0;
254: ssize_t linelen;
255: char *line = NULL;
1.46 nicm 256:
1.99 nicm 257: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
258: signal(SIGCHLD, SIG_IGN);
259:
1.46 nicm 260: /* Set up the initial command. */
1.121 nicm 261: if (shell_command != NULL) {
1.46 nicm 262: msg = MSG_SHELL;
1.139 nicm 263: flags |= CLIENT_STARTSERVER;
1.46 nicm 264: } else if (argc == 0) {
265: msg = MSG_COMMAND;
1.138 nicm 266: flags |= CLIENT_STARTSERVER;
1.46 nicm 267: } else {
268: msg = MSG_COMMAND;
269:
270: /*
271: * It sucks parsing the command string twice (in client and
272: * later in server) but it is necessary to get the start server
273: * flag.
274: */
1.129 nicm 275: pr = cmd_parse_from_arguments(argc, argv, NULL);
276: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 nicm 277: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
278: flags |= CLIENT_STARTSERVER;
1.129 nicm 279: cmd_list_free(pr->cmdlist);
280: } else
281: free(pr->error);
1.46 nicm 282: }
283:
1.109 nicm 284: /* Create client process structure (starts logging). */
1.122 nicm 285: client_proc = proc_start("client");
286: proc_set_signals(client_proc, client_signal);
1.109 nicm 287:
1.148 nicm 288: /* Save the flags. */
289: client_flags = flags;
1.149 nicm 290: log_debug("flags are %#llx", (unsigned long long)client_flags);
1.148 nicm 291:
1.82 nicm 292: /* Initialize the client socket and start the server. */
1.138 nicm 293: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 294: if (fd == -1) {
1.87 nicm 295: if (errno == ECONNREFUSED) {
296: fprintf(stderr, "no server running on %s\n",
297: socket_path);
298: } else {
299: fprintf(stderr, "error connecting to %s (%s)\n",
300: socket_path, strerror(errno));
301: }
1.46 nicm 302: return (1);
303: }
1.121 nicm 304: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 305:
1.97 nicm 306: /* Save these before pledge(). */
1.128 nicm 307: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 308: cwd = "/";
1.97 nicm 309: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
310: ttynam = "";
311:
312: /*
313: * Drop privileges for client. "proc exec" is needed for -c and for
314: * locking (which uses system(3)).
315: *
316: * "tty" is needed to restore termios(4) and also for some reason -CC
317: * does not work properly without it (input is not recognised).
318: *
319: * "sendfd" is dropped later in client_dispatch_wait().
320: */
1.132 nicm 321: if (pledge(
322: "stdio rpath wpath cpath unix sendfd proc exec tty",
323: NULL) != 0)
1.97 nicm 324: fatal("pledge failed");
325:
326: /* Free stuff that is not used in the client. */
1.119 nicm 327: if (ptm_fd != -1)
328: close(ptm_fd);
1.100 nicm 329: options_free(global_options);
330: options_free(global_s_options);
331: options_free(global_w_options);
1.101 nicm 332: environ_free(global_environ);
1.46 nicm 333:
1.132 nicm 334: /* Set up control mode. */
1.93 nicm 335: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 336: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
337: fprintf(stderr, "tcgetattr failed: %s\n",
338: strerror(errno));
339: return (1);
340: }
1.56 nicm 341: cfmakeraw(&tio);
342: tio.c_iflag = ICRNL|IXANY;
343: tio.c_oflag = OPOST|ONLCR;
344: tio.c_lflag = NOKERNINFO;
345: tio.c_cflag = CREAD|CS8|HUPCL;
346: tio.c_cc[VMIN] = 1;
347: tio.c_cc[VTIME] = 0;
348: cfsetispeed(&tio, cfgetispeed(&saved_tio));
349: cfsetospeed(&tio, cfgetospeed(&saved_tio));
350: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
351: }
1.1 nicm 352:
1.71 nicm 353: /* Send identify messages. */
1.142 nicm 354: client_send_identify(ttynam, cwd, feat);
1.1 nicm 355:
1.46 nicm 356: /* Send first command. */
357: if (msg == MSG_COMMAND) {
1.70 nicm 358: /* How big is the command? */
359: size = 0;
360: for (i = 0; i < argc; i++)
361: size += strlen(argv[i]) + 1;
1.124 nicm 362: if (size > MAX_IMSGSIZE - (sizeof *data)) {
363: fprintf(stderr, "command too long\n");
364: return (1);
365: }
1.70 nicm 366: data = xmalloc((sizeof *data) + size);
1.46 nicm 367:
368: /* Prepare command for server. */
1.70 nicm 369: data->argc = argc;
1.83 nicm 370: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 371: fprintf(stderr, "command too long\n");
1.70 nicm 372: free(data);
1.46 nicm 373: return (1);
374: }
1.70 nicm 375: size += sizeof *data;
1.46 nicm 376:
1.70 nicm 377: /* Send the command. */
1.99 nicm 378: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 379: fprintf(stderr, "failed to send command\n");
380: free(data);
381: return (1);
382: }
383: free(data);
1.46 nicm 384: } else if (msg == MSG_SHELL)
1.99 nicm 385: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 386:
1.99 nicm 387: /* Start main loop. */
388: proc_loop(client_proc, NULL);
1.46 nicm 389:
1.115 nicm 390: /* Run command if user requested exec, instead of exiting. */
391: if (client_exittype == MSG_EXEC) {
392: if (client_flags & CLIENT_CONTROLCONTROL)
393: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
394: client_exec(client_execshell, client_execcmd);
395: }
396:
1.146 nicm 397: /* Restore streams to blocking. */
398: setblocking(STDIN_FILENO, 1);
399: setblocking(STDOUT_FILENO, 1);
400: setblocking(STDERR_FILENO, 1);
401:
1.46 nicm 402: /* Print the exit message, if any, and exit. */
1.48 nicm 403: if (client_attached) {
1.93 nicm 404: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 405: printf("[%s]\n", client_exit_message());
1.48 nicm 406:
407: ppid = getppid();
408: if (client_exittype == MSG_DETACHKILL && ppid > 1)
409: kill(ppid, SIGHUP);
1.146 nicm 410: } else if (client_flags & CLIENT_CONTROL) {
1.68 nicm 411: if (client_exitreason != CLIENT_EXIT_NONE)
412: printf("%%exit %s\n", client_exit_message());
413: else
414: printf("%%exit\n");
1.148 nicm 415: fflush(stdout);
416: if (client_flags & CLIENT_CONTROL_WAITEXIT) {
417: setvbuf(stdin, NULL, _IOLBF, 0);
418: for (;;) {
419: linelen = getline(&line, &linesize, stdin);
420: if (linelen <= 1)
421: break;
422: }
423: free(line);
424: }
1.146 nicm 425: if (client_flags & CLIENT_CONTROLCONTROL) {
426: printf("\033\\");
1.148 nicm 427: fflush(stdout);
1.146 nicm 428: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
429: }
1.112 nicm 430: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 431: fprintf(stderr, "%s\n", client_exit_message());
1.46 nicm 432: return (client_exitval);
1.1 nicm 433: }
434:
1.71 nicm 435: /* Send identify messages to server. */
1.114 nicm 436: static void
1.142 nicm 437: client_send_identify(const char *ttynam, const char *cwd, int feat)
1.26 nicm 438: {
1.90 nicm 439: const char *s;
1.71 nicm 440: char **ss;
1.91 nicm 441: size_t sslen;
1.93 nicm 442: int fd, flags = client_flags;
1.90 nicm 443: pid_t pid;
1.71 nicm 444:
1.99 nicm 445: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.149 nicm 446: proc_send(client_peer, MSG_IDENTIFY_LONGFLAGS, -1, &client_flags,
447: sizeof client_flags);
1.71 nicm 448:
449: if ((s = getenv("TERM")) == NULL)
450: s = "";
1.99 nicm 451: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.142 nicm 452: proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat);
1.71 nicm 453:
1.107 nicm 454: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
455: strlen(ttynam) + 1);
1.99 nicm 456: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 457:
1.50 nicm 458: if ((fd = dup(STDIN_FILENO)) == -1)
459: fatal("dup failed");
1.99 nicm 460: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.145 nicm 461: if ((fd = dup(STDOUT_FILENO)) == -1)
462: fatal("dup failed");
463: proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0);
1.90 nicm 464:
465: pid = getpid();
1.99 nicm 466: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 467:
1.91 nicm 468: for (ss = environ; *ss != NULL; ss++) {
469: sslen = strlen(*ss) + 1;
1.107 nicm 470: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
471: continue;
472: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 473: }
1.75 nicm 474:
1.99 nicm 475: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 476: }
477:
1.132 nicm 478: /* File write error callback. */
1.114 nicm 479: static void
1.132 nicm 480: client_write_error_callback(__unused struct bufferevent *bev,
481: __unused short what, void *arg)
1.54 nicm 482: {
1.132 nicm 483: struct client_file *cf = arg;
1.54 nicm 484:
1.132 nicm 485: log_debug("write error file %d", cf->stream);
486:
487: bufferevent_free(cf->event);
488: cf->event = NULL;
489:
490: close(cf->fd);
491: cf->fd = -1;
1.134 nicm 492:
493: if (client_exitflag)
494: client_exit();
1.132 nicm 495: }
496:
497: /* File write callback. */
498: static void
499: client_write_callback(__unused struct bufferevent *bev, void *arg)
500: {
501: struct client_file *cf = arg;
502:
503: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
504: bufferevent_free(cf->event);
505: close(cf->fd);
506: RB_REMOVE(client_files, &client_files, cf);
507: file_free(cf);
508: }
1.133 nicm 509:
510: if (client_exitflag)
511: client_exit();
1.132 nicm 512: }
513:
514: /* Open write file. */
515: static void
516: client_write_open(void *data, size_t datalen)
517: {
518: struct msg_write_open *msg = data;
1.135 nicm 519: const char *path;
1.132 nicm 520: struct msg_write_ready reply;
521: struct client_file find, *cf;
522: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
523: int error = 0;
524:
1.135 nicm 525: if (datalen < sizeof *msg)
1.132 nicm 526: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 527: if (datalen == sizeof *msg)
528: path = "-";
529: else
530: path = (const char *)(msg + 1);
531: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 532:
533: find.stream = msg->stream;
534: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
535: cf = file_create(NULL, msg->stream, NULL, NULL);
536: RB_INSERT(client_files, &client_files, cf);
537: } else {
538: error = EBADF;
539: goto reply;
540: }
541: if (cf->closed) {
542: error = EBADF;
543: goto reply;
544: }
545:
546: cf->fd = -1;
547: if (msg->fd == -1)
1.135 nicm 548: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 549: else {
550: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
551: errno = EBADF;
552: else {
553: cf->fd = dup(msg->fd);
1.143 nicm 554: if (~client_flags & CLIENT_CONTROL)
1.132 nicm 555: close(msg->fd); /* can only be used once */
556: }
557: }
558: if (cf->fd == -1) {
559: error = errno;
560: goto reply;
561: }
562:
563: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
564: client_write_error_callback, cf);
565: bufferevent_enable(cf->event, EV_WRITE);
566: goto reply;
567:
568: reply:
569: reply.stream = msg->stream;
570: reply.error = error;
571: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
572: }
573:
574: /* Write to client file. */
575: static void
576: client_write_data(void *data, size_t datalen)
577: {
578: struct msg_write_data *msg = data;
579: struct client_file find, *cf;
1.135 nicm 580: size_t size = datalen - sizeof *msg;
1.132 nicm 581:
1.135 nicm 582: if (datalen < sizeof *msg)
1.132 nicm 583: fatalx("bad MSG_WRITE size");
584: find.stream = msg->stream;
585: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
586: fatalx("unknown stream number");
1.135 nicm 587: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 588:
589: if (cf->event != NULL)
1.135 nicm 590: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 591: }
592:
593: /* Close client file. */
594: static void
595: client_write_close(void *data, size_t datalen)
596: {
597: struct msg_write_close *msg = data;
598: struct client_file find, *cf;
1.54 nicm 599:
1.132 nicm 600: if (datalen != sizeof *msg)
601: fatalx("bad MSG_WRITE_CLOSE size");
602: find.stream = msg->stream;
603: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
604: fatalx("unknown stream number");
605: log_debug("close file %d", cf->stream);
606:
607: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
608: if (cf->event != NULL)
609: bufferevent_free(cf->event);
610: if (cf->fd != -1)
611: close(cf->fd);
612: RB_REMOVE(client_files, &client_files, cf);
613: file_free(cf);
614: }
1.54 nicm 615: }
616:
1.132 nicm 617: /* File read callback. */
1.114 nicm 618: static void
1.132 nicm 619: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 620: {
1.132 nicm 621: struct client_file *cf = arg;
622: void *bdata;
623: size_t bsize;
1.135 nicm 624: struct msg_read_data *msg;
625: size_t msglen;
1.132 nicm 626:
1.135 nicm 627: msg = xmalloc(sizeof *msg);
1.132 nicm 628: for (;;) {
629: bdata = EVBUFFER_DATA(cf->event->input);
630: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 631:
1.132 nicm 632: if (bsize == 0)
1.57 nicm 633: break;
1.136 nicm 634: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
635: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 636: log_debug("read %zu from file %d", bsize, cf->stream);
637:
1.135 nicm 638: msglen = (sizeof *msg) + bsize;
639: msg = xrealloc(msg, msglen);
640: msg->stream = cf->stream;
641: memcpy(msg + 1, bdata, bsize);
642: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 643:
644: evbuffer_drain(cf->event->input, bsize);
645: }
1.135 nicm 646: free(msg);
1.132 nicm 647: }
648:
649: /* File read error callback. */
650: static void
651: client_read_error_callback(__unused struct bufferevent *bev,
652: __unused short what, void *arg)
653: {
654: struct client_file *cf = arg;
655: struct msg_read_done msg;
656:
657: log_debug("read error file %d", cf->stream);
658:
659: msg.stream = cf->stream;
660: msg.error = 0;
661: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
662:
663: bufferevent_free(cf->event);
664: close(cf->fd);
665: RB_REMOVE(client_files, &client_files, cf);
666: file_free(cf);
667: }
668:
669: /* Open read file. */
670: static void
671: client_read_open(void *data, size_t datalen)
672: {
673: struct msg_read_open *msg = data;
1.135 nicm 674: const char *path;
1.132 nicm 675: struct msg_read_done reply;
676: struct client_file find, *cf;
677: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 678: int error;
1.132 nicm 679:
1.135 nicm 680: if (datalen < sizeof *msg)
1.132 nicm 681: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 682: if (datalen == sizeof *msg)
683: path = "-";
684: else
685: path = (const char *)(msg + 1);
686: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 687:
688: find.stream = msg->stream;
689: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
690: cf = file_create(NULL, msg->stream, NULL, NULL);
691: RB_INSERT(client_files, &client_files, cf);
692: } else {
693: error = EBADF;
694: goto reply;
1.57 nicm 695: }
1.132 nicm 696: if (cf->closed) {
697: error = EBADF;
698: goto reply;
699: }
700:
701: cf->fd = -1;
702: if (msg->fd == -1)
1.135 nicm 703: cf->fd = open(path, flags);
1.132 nicm 704: else {
705: if (msg->fd != STDIN_FILENO)
706: errno = EBADF;
707: else {
708: cf->fd = dup(msg->fd);
1.143 nicm 709: if (~client_flags & CLIENT_CONTROL)
710: close(msg->fd); /* can only be used once */
1.132 nicm 711: }
712: }
713: if (cf->fd == -1) {
714: error = errno;
715: goto reply;
716: }
717:
718: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
719: client_read_error_callback, cf);
720: bufferevent_enable(cf->event, EV_READ);
721: return;
722:
723: reply:
724: reply.stream = msg->stream;
725: reply.error = error;
726: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 727: }
728:
1.93 nicm 729: /* Run command in shell; used for -c. */
1.114 nicm 730: static __dead void
1.111 nicm 731: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 732: {
733: const char *name, *ptr;
734: char *argv0;
735:
1.111 nicm 736: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 737:
738: ptr = strrchr(shell, '/');
739: if (ptr != NULL && *(ptr + 1) != '\0')
740: name = ptr + 1;
741: else
742: name = shell;
743: if (client_flags & CLIENT_LOGIN)
744: xasprintf(&argv0, "-%s", name);
745: else
746: xasprintf(&argv0, "%s", name);
747: setenv("SHELL", shell, 1);
748:
1.123 nicm 749: proc_clear_signals(client_proc, 1);
750:
1.93 nicm 751: setblocking(STDIN_FILENO, 1);
752: setblocking(STDOUT_FILENO, 1);
753: setblocking(STDERR_FILENO, 1);
754: closefrom(STDERR_FILENO + 1);
755:
1.111 nicm 756: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 757: fatal("execl failed");
758: }
759:
1.99 nicm 760: /* Callback to handle signals in the client. */
1.114 nicm 761: static void
1.99 nicm 762: client_signal(int sig)
763: {
764: struct sigaction sigact;
765: int status;
766:
1.150 ! nicm 767: log_debug("%s: %s", __func__, strsignal(sig));
1.99 nicm 768: if (sig == SIGCHLD)
769: waitpid(WAIT_ANY, &status, WNOHANG);
770: else if (!client_attached) {
771: if (sig == SIGTERM)
772: proc_exit(client_proc);
773: } else {
774: switch (sig) {
775: case SIGHUP:
776: client_exitreason = CLIENT_EXIT_LOST_TTY;
777: client_exitval = 1;
778: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
779: break;
780: case SIGTERM:
1.150 ! nicm 781: if (!client_suspended)
! 782: client_exitreason = CLIENT_EXIT_TERMINATED;
1.99 nicm 783: client_exitval = 1;
784: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
785: break;
786: case SIGWINCH:
787: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
788: break;
789: case SIGCONT:
790: memset(&sigact, 0, sizeof sigact);
791: sigemptyset(&sigact.sa_mask);
792: sigact.sa_flags = SA_RESTART;
793: sigact.sa_handler = SIG_IGN;
794: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
795: fatal("sigaction failed");
796: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
1.150 ! nicm 797: client_suspended = 0;
1.99 nicm 798: break;
799: }
800: }
801: }
802:
803: /* Callback for client read events. */
1.114 nicm 804: static void
1.121 nicm 805: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 806: {
807: if (imsg == NULL) {
808: client_exitreason = CLIENT_EXIT_LOST_SERVER;
809: client_exitval = 1;
1.109 nicm 810: proc_exit(client_proc);
811: return;
812: }
813:
814: if (client_attached)
1.99 nicm 815: client_dispatch_attached(imsg);
816: else
1.121 nicm 817: client_dispatch_wait(imsg);
1.99 nicm 818: }
819:
1.147 nicm 820: /* Process an exit message. */
821: static void
822: client_dispatch_exit_message(char *data, size_t datalen)
823: {
824: int retval;
825:
826: if (datalen < sizeof retval && datalen != 0)
827: fatalx("bad MSG_EXIT size");
828:
829: if (datalen >= sizeof retval) {
830: memcpy(&retval, data, sizeof retval);
831: client_exitval = retval;
832: }
833:
834: if (datalen > sizeof retval) {
835: datalen -= sizeof retval;
836: data += sizeof retval;
837:
838: client_exitmessage = xmalloc(datalen);
839: memcpy(client_exitmessage, data, datalen);
840: client_exitmessage[datalen - 1] = '\0';
841:
842: client_exitreason = CLIENT_EXIT_MESSAGE_PROVIDED;
843: }
844: }
845:
1.46 nicm 846: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 847: static void
1.121 nicm 848: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 849: {
1.132 nicm 850: char *data;
851: ssize_t datalen;
852: static int pledge_applied;
1.97 nicm 853:
854: /*
855: * "sendfd" is no longer required once all of the identify messages
856: * have been sent. We know the server won't send us anything until that
857: * point (because we don't ask it to), so we can drop "sendfd" once we
858: * get the first message from the server.
859: */
860: if (!pledge_applied) {
1.132 nicm 861: if (pledge(
862: "stdio rpath wpath cpath unix proc exec tty",
863: NULL) != 0)
1.97 nicm 864: fatal("pledge failed");
865: pledge_applied = 1;
1.132 nicm 866: }
1.46 nicm 867:
1.99 nicm 868: data = imsg->data;
869: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 870:
1.99 nicm 871: switch (imsg->hdr.type) {
872: case MSG_EXIT:
873: case MSG_SHUTDOWN:
1.147 nicm 874: client_dispatch_exit_message(data, datalen);
1.133 nicm 875: client_exitflag = 1;
876: client_exit();
1.99 nicm 877: break;
878: case MSG_READY:
879: if (datalen != 0)
880: fatalx("bad MSG_READY size");
1.54 nicm 881:
1.99 nicm 882: client_attached = 1;
883: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
884: break;
885: case MSG_VERSION:
886: if (datalen != 0)
887: fatalx("bad MSG_VERSION size");
888:
889: fprintf(stderr, "protocol version mismatch "
890: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 891: imsg->hdr.peerid & 0xff);
1.99 nicm 892: client_exitval = 1;
893: proc_exit(client_proc);
894: break;
1.148 nicm 895: case MSG_FLAGS:
896: if (datalen != sizeof client_flags)
897: fatalx("bad MSG_FLAGS string");
898:
899: memcpy(&client_flags, data, sizeof client_flags);
1.149 nicm 900: log_debug("new flags are %#llx",
901: (unsigned long long)client_flags);
1.148 nicm 902: break;
1.99 nicm 903: case MSG_SHELL:
904: if (datalen == 0 || data[datalen - 1] != '\0')
905: fatalx("bad MSG_SHELL string");
906:
1.121 nicm 907: client_exec(data, shell_command);
1.99 nicm 908: /* NOTREACHED */
909: case MSG_DETACH:
910: case MSG_DETACHKILL:
911: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
912: break;
913: case MSG_EXITED:
914: proc_exit(client_proc);
1.132 nicm 915: break;
916: case MSG_READ_OPEN:
917: client_read_open(data, datalen);
918: break;
919: case MSG_WRITE_OPEN:
920: client_write_open(data, datalen);
921: break;
922: case MSG_WRITE:
923: client_write_data(data, datalen);
924: break;
925: case MSG_WRITE_CLOSE:
926: client_write_close(data, datalen);
1.137 nicm 927: break;
928: case MSG_OLDSTDERR:
929: case MSG_OLDSTDIN:
930: case MSG_OLDSTDOUT:
931: fprintf(stderr, "server version is too old for client\n");
932: proc_exit(client_proc);
1.99 nicm 933: break;
1.46 nicm 934: }
935: }
936:
937: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 938: static void
1.99 nicm 939: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 940: {
1.69 nicm 941: struct sigaction sigact;
942: char *data;
1.99 nicm 943: ssize_t datalen;
1.9 nicm 944:
1.99 nicm 945: data = imsg->data;
946: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 947:
1.99 nicm 948: switch (imsg->hdr.type) {
1.148 nicm 949: case MSG_FLAGS:
950: if (datalen != sizeof client_flags)
951: fatalx("bad MSG_FLAGS string");
952:
953: memcpy(&client_flags, data, sizeof client_flags);
1.149 nicm 954: log_debug("new flags are %#llx",
955: (unsigned long long)client_flags);
1.148 nicm 956: break;
1.99 nicm 957: case MSG_DETACH:
958: case MSG_DETACHKILL:
959: if (datalen == 0 || data[datalen - 1] != '\0')
960: fatalx("bad MSG_DETACH string");
961:
962: client_exitsession = xstrdup(data);
963: client_exittype = imsg->hdr.type;
964: if (imsg->hdr.type == MSG_DETACHKILL)
965: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
966: else
967: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 968: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
969: break;
970: case MSG_EXEC:
971: if (datalen == 0 || data[datalen - 1] != '\0' ||
972: strlen(data) + 1 == (size_t)datalen)
973: fatalx("bad MSG_EXEC string");
974: client_execcmd = xstrdup(data);
975: client_execshell = xstrdup(data + strlen(data) + 1);
976:
977: client_exittype = imsg->hdr.type;
1.99 nicm 978: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
979: break;
980: case MSG_EXIT:
1.147 nicm 981: client_dispatch_exit_message(data, datalen);
982: if (client_exitreason == CLIENT_EXIT_NONE)
983: client_exitreason = CLIENT_EXIT_EXITED;
1.99 nicm 984: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
985: break;
986: case MSG_EXITED:
987: if (datalen != 0)
988: fatalx("bad MSG_EXITED size");
1.9 nicm 989:
1.99 nicm 990: proc_exit(client_proc);
991: break;
992: case MSG_SHUTDOWN:
993: if (datalen != 0)
994: fatalx("bad MSG_SHUTDOWN size");
995:
996: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
997: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
998: client_exitval = 1;
999: break;
1000: case MSG_SUSPEND:
1001: if (datalen != 0)
1002: fatalx("bad MSG_SUSPEND size");
1003:
1004: memset(&sigact, 0, sizeof sigact);
1005: sigemptyset(&sigact.sa_mask);
1006: sigact.sa_flags = SA_RESTART;
1007: sigact.sa_handler = SIG_DFL;
1008: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
1009: fatal("sigaction failed");
1.150 ! nicm 1010: client_suspended = 1;
1.99 nicm 1011: kill(getpid(), SIGTSTP);
1012: break;
1013: case MSG_LOCK:
1014: if (datalen == 0 || data[datalen - 1] != '\0')
1015: fatalx("bad MSG_LOCK string");
1.9 nicm 1016:
1.99 nicm 1017: system(data);
1018: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
1019: break;
1.9 nicm 1020: }
1.1 nicm 1021: }
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