Annotation of src/usr.bin/tmux/client.c, Revision 1.147
1.147 ! nicm 1: /* $OpenBSD: client.c,v 1.146 2020/06/01 09:43:00 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,
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 *);
62: static int client_connect(struct event_base *, const char *, int);
1.142 nicm 63: static void client_send_identify(const char *, const char *, int);
1.114 nicm 64: static void client_signal(int);
65: static void client_dispatch(struct imsg *, void *);
66: static void client_dispatch_attached(struct imsg *);
1.121 nicm 67: static void client_dispatch_wait(struct imsg *);
1.114 nicm 68: static const char *client_exit_message(void);
1.25 nicm 69:
1.49 nicm 70: /*
71: * Get server create lock. If already held then server start is happening in
1.110 nicm 72: * another client, so block until the lock is released and return -2 to
73: * retry. Return -1 on failure to continue and start the server anyway.
1.49 nicm 74: */
1.114 nicm 75: static int
1.49 nicm 76: client_get_lock(char *lockfile)
77: {
78: int lockfd;
79:
1.110 nicm 80: log_debug("lock file is %s", lockfile);
81:
1.109 nicm 82: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
1.110 nicm 83: log_debug("open failed: %s", strerror(errno));
84: return (-1);
1.109 nicm 85: }
1.49 nicm 86:
1.82 nicm 87: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
88: log_debug("flock failed: %s", strerror(errno));
89: if (errno != EAGAIN)
90: return (lockfd);
91: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
1.49 nicm 92: /* nothing */;
93: close(lockfd);
1.110 nicm 94: return (-2);
1.49 nicm 95: }
1.82 nicm 96: log_debug("flock succeeded");
1.49 nicm 97:
98: return (lockfd);
99: }
100:
1.46 nicm 101: /* Connect client to server. */
1.114 nicm 102: static int
1.138 nicm 103: client_connect(struct event_base *base, const char *path, int flags)
1.1 nicm 104: {
1.26 nicm 105: struct sockaddr_un sa;
106: size_t size;
1.82 nicm 107: int fd, lockfd = -1, locked = 0;
108: char *lockfile = NULL;
1.1 nicm 109:
110: memset(&sa, 0, sizeof sa);
111: sa.sun_family = AF_UNIX;
112: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
113: if (size >= sizeof sa.sun_path) {
114: errno = ENAMETOOLONG;
1.46 nicm 115: return (-1);
1.1 nicm 116: }
1.82 nicm 117: log_debug("socket is %s", path);
1.1 nicm 118:
1.49 nicm 119: retry:
1.10 nicm 120: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.109 nicm 121: return (-1);
1.1 nicm 122:
1.82 nicm 123: log_debug("trying connect");
1.109 nicm 124: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
1.82 nicm 125: log_debug("connect failed: %s", strerror(errno));
1.49 nicm 126: if (errno != ECONNREFUSED && errno != ENOENT)
127: goto failed;
1.138 nicm 128: if (~flags & CLIENT_STARTSERVER)
1.46 nicm 129: goto failed;
1.49 nicm 130: close(fd);
131:
1.82 nicm 132: if (!locked) {
133: xasprintf(&lockfile, "%s.lock", path);
1.110 nicm 134: if ((lockfd = client_get_lock(lockfile)) < 0) {
135: log_debug("didn't get lock (%d)", lockfd);
136:
1.82 nicm 137: free(lockfile);
1.110 nicm 138: lockfile = NULL;
139:
140: if (lockfd == -2)
141: goto retry;
1.82 nicm 142: }
1.110 nicm 143: log_debug("got lock (%d)", lockfd);
1.82 nicm 144:
145: /*
146: * Always retry at least once, even if we got the lock,
147: * because another client could have taken the lock,
148: * started the server and released the lock between our
149: * connect() and flock().
150: */
151: locked = 1;
1.49 nicm 152: goto retry;
1.78 nicm 153: }
1.82 nicm 154:
1.110 nicm 155: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
1.78 nicm 156: free(lockfile);
157: close(lockfd);
1.49 nicm 158: return (-1);
1.78 nicm 159: }
1.138 nicm 160: fd = server_start(client_proc, flags, base, lockfd, lockfile);
1.82 nicm 161: }
1.95 nicm 162:
1.110 nicm 163: if (locked && lockfd >= 0) {
1.58 nicm 164: free(lockfile);
1.49 nicm 165: close(lockfd);
1.1 nicm 166: }
1.47 nicm 167: setblocking(fd, 0);
1.46 nicm 168: return (fd);
169:
170: failed:
1.95 nicm 171: if (locked) {
172: free(lockfile);
173: close(lockfd);
174: }
1.46 nicm 175: close(fd);
176: return (-1);
177: }
178:
1.52 nicm 179: /* Get exit string from reason number. */
180: const char *
181: client_exit_message(void)
182: {
1.73 nicm 183: static char msg[256];
184:
1.52 nicm 185: switch (client_exitreason) {
186: case CLIENT_EXIT_NONE:
187: break;
188: case CLIENT_EXIT_DETACHED:
1.73 nicm 189: if (client_exitsession != NULL) {
190: xsnprintf(msg, sizeof msg, "detached "
191: "(from session %s)", client_exitsession);
192: return (msg);
193: }
1.52 nicm 194: return ("detached");
195: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 196: if (client_exitsession != NULL) {
197: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
198: "(from session %s)", client_exitsession);
199: return (msg);
200: }
1.52 nicm 201: return ("detached and SIGHUP");
202: case CLIENT_EXIT_LOST_TTY:
203: return ("lost tty");
204: case CLIENT_EXIT_TERMINATED:
205: return ("terminated");
206: case CLIENT_EXIT_LOST_SERVER:
1.131 nicm 207: return ("server exited unexpectedly");
1.52 nicm 208: case CLIENT_EXIT_EXITED:
209: return ("exited");
210: case CLIENT_EXIT_SERVER_EXITED:
211: return ("server exited");
1.147 ! nicm 212: case CLIENT_EXIT_MESSAGE_PROVIDED:
! 213: return (client_exitmessage);
1.52 nicm 214: }
215: return ("unknown reason");
216: }
217:
1.133 nicm 218: /* Exit if all streams flushed. */
219: static void
220: client_exit(void)
221: {
222: struct client_file *cf;
223: size_t left;
224: int waiting = 0;
225:
226: RB_FOREACH (cf, client_files, &client_files) {
227: if (cf->event == NULL)
228: continue;
229: left = EVBUFFER_LENGTH(cf->event->output);
230: if (left != 0) {
231: waiting++;
232: log_debug("file %u %zu bytes left", cf->stream, left);
233: }
234: }
235: if (waiting == 0)
236: proc_exit(client_proc);
237: }
238:
1.46 nicm 239: /* Client main loop. */
240: int
1.142 nicm 241: client_main(struct event_base *base, int argc, char **argv, int flags, int feat)
1.46 nicm 242: {
1.129 nicm 243: struct cmd_parse_result *pr;
1.132 nicm 244: struct msg_command *data;
1.138 nicm 245: int fd, i;
1.98 nicm 246: const char *ttynam, *cwd;
1.48 nicm 247: pid_t ppid;
1.46 nicm 248: enum msgtype msg;
1.56 nicm 249: struct termios tio, saved_tio;
1.70 nicm 250: size_t size;
1.46 nicm 251:
1.99 nicm 252: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
253: signal(SIGCHLD, SIG_IGN);
254:
1.46 nicm 255: /* Set up the initial command. */
1.121 nicm 256: if (shell_command != NULL) {
1.46 nicm 257: msg = MSG_SHELL;
1.139 nicm 258: flags |= CLIENT_STARTSERVER;
1.46 nicm 259: } else if (argc == 0) {
260: msg = MSG_COMMAND;
1.138 nicm 261: flags |= CLIENT_STARTSERVER;
1.46 nicm 262: } else {
263: msg = MSG_COMMAND;
264:
265: /*
266: * It sucks parsing the command string twice (in client and
267: * later in server) but it is necessary to get the start server
268: * flag.
269: */
1.129 nicm 270: pr = cmd_parse_from_arguments(argc, argv, NULL);
271: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 nicm 272: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
273: flags |= CLIENT_STARTSERVER;
1.129 nicm 274: cmd_list_free(pr->cmdlist);
275: } else
276: free(pr->error);
1.46 nicm 277: }
278:
1.138 nicm 279: /* Save the flags. */
280: client_flags = flags;
281:
1.109 nicm 282: /* Create client process structure (starts logging). */
1.122 nicm 283: client_proc = proc_start("client");
284: proc_set_signals(client_proc, client_signal);
1.109 nicm 285:
1.82 nicm 286: /* Initialize the client socket and start the server. */
1.138 nicm 287: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 288: if (fd == -1) {
1.87 nicm 289: if (errno == ECONNREFUSED) {
290: fprintf(stderr, "no server running on %s\n",
291: socket_path);
292: } else {
293: fprintf(stderr, "error connecting to %s (%s)\n",
294: socket_path, strerror(errno));
295: }
1.46 nicm 296: return (1);
297: }
1.121 nicm 298: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 299:
1.97 nicm 300: /* Save these before pledge(). */
1.128 nicm 301: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 302: cwd = "/";
1.97 nicm 303: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
304: ttynam = "";
305:
306: /*
307: * Drop privileges for client. "proc exec" is needed for -c and for
308: * locking (which uses system(3)).
309: *
310: * "tty" is needed to restore termios(4) and also for some reason -CC
311: * does not work properly without it (input is not recognised).
312: *
313: * "sendfd" is dropped later in client_dispatch_wait().
314: */
1.132 nicm 315: if (pledge(
316: "stdio rpath wpath cpath unix sendfd proc exec tty",
317: NULL) != 0)
1.97 nicm 318: fatal("pledge failed");
319:
320: /* Free stuff that is not used in the client. */
1.119 nicm 321: if (ptm_fd != -1)
322: close(ptm_fd);
1.100 nicm 323: options_free(global_options);
324: options_free(global_s_options);
325: options_free(global_w_options);
1.101 nicm 326: environ_free(global_environ);
1.46 nicm 327:
1.132 nicm 328: /* Set up control mode. */
1.93 nicm 329: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 330: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
331: fprintf(stderr, "tcgetattr failed: %s\n",
332: strerror(errno));
333: return (1);
334: }
1.56 nicm 335: cfmakeraw(&tio);
336: tio.c_iflag = ICRNL|IXANY;
337: tio.c_oflag = OPOST|ONLCR;
338: tio.c_lflag = NOKERNINFO;
339: tio.c_cflag = CREAD|CS8|HUPCL;
340: tio.c_cc[VMIN] = 1;
341: tio.c_cc[VTIME] = 0;
342: cfsetispeed(&tio, cfgetispeed(&saved_tio));
343: cfsetospeed(&tio, cfgetospeed(&saved_tio));
344: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
345: }
1.1 nicm 346:
1.71 nicm 347: /* Send identify messages. */
1.142 nicm 348: client_send_identify(ttynam, cwd, feat);
1.1 nicm 349:
1.46 nicm 350: /* Send first command. */
351: if (msg == MSG_COMMAND) {
1.70 nicm 352: /* How big is the command? */
353: size = 0;
354: for (i = 0; i < argc; i++)
355: size += strlen(argv[i]) + 1;
1.124 nicm 356: if (size > MAX_IMSGSIZE - (sizeof *data)) {
357: fprintf(stderr, "command too long\n");
358: return (1);
359: }
1.70 nicm 360: data = xmalloc((sizeof *data) + size);
1.46 nicm 361:
362: /* Prepare command for server. */
1.70 nicm 363: data->argc = argc;
1.83 nicm 364: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 365: fprintf(stderr, "command too long\n");
1.70 nicm 366: free(data);
1.46 nicm 367: return (1);
368: }
1.70 nicm 369: size += sizeof *data;
1.46 nicm 370:
1.70 nicm 371: /* Send the command. */
1.99 nicm 372: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 373: fprintf(stderr, "failed to send command\n");
374: free(data);
375: return (1);
376: }
377: free(data);
1.46 nicm 378: } else if (msg == MSG_SHELL)
1.99 nicm 379: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 380:
1.99 nicm 381: /* Start main loop. */
382: proc_loop(client_proc, NULL);
1.46 nicm 383:
1.115 nicm 384: /* Run command if user requested exec, instead of exiting. */
385: if (client_exittype == MSG_EXEC) {
386: if (client_flags & CLIENT_CONTROLCONTROL)
387: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
388: client_exec(client_execshell, client_execcmd);
389: }
390:
1.146 nicm 391: /* Restore streams to blocking. */
392: setblocking(STDIN_FILENO, 1);
393: setblocking(STDOUT_FILENO, 1);
394: setblocking(STDERR_FILENO, 1);
395:
1.46 nicm 396: /* Print the exit message, if any, and exit. */
1.48 nicm 397: if (client_attached) {
1.93 nicm 398: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 399: printf("[%s]\n", client_exit_message());
1.48 nicm 400:
401: ppid = getppid();
402: if (client_exittype == MSG_DETACHKILL && ppid > 1)
403: kill(ppid, SIGHUP);
1.146 nicm 404: } else if (client_flags & CLIENT_CONTROL) {
1.68 nicm 405: if (client_exitreason != CLIENT_EXIT_NONE)
406: printf("%%exit %s\n", client_exit_message());
407: else
408: printf("%%exit\n");
1.146 nicm 409: if (client_flags & CLIENT_CONTROLCONTROL) {
410: printf("\033\\");
411: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
412: }
1.112 nicm 413: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 414: fprintf(stderr, "%s\n", client_exit_message());
1.46 nicm 415: return (client_exitval);
1.1 nicm 416: }
417:
1.71 nicm 418: /* Send identify messages to server. */
1.114 nicm 419: static void
1.142 nicm 420: client_send_identify(const char *ttynam, const char *cwd, int feat)
1.26 nicm 421: {
1.90 nicm 422: const char *s;
1.71 nicm 423: char **ss;
1.91 nicm 424: size_t sslen;
1.93 nicm 425: int fd, flags = client_flags;
1.90 nicm 426: pid_t pid;
1.71 nicm 427:
1.99 nicm 428: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 429:
430: if ((s = getenv("TERM")) == NULL)
431: s = "";
1.99 nicm 432: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.142 nicm 433: proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat);
1.71 nicm 434:
1.107 nicm 435: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
436: strlen(ttynam) + 1);
1.99 nicm 437: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 438:
1.50 nicm 439: if ((fd = dup(STDIN_FILENO)) == -1)
440: fatal("dup failed");
1.99 nicm 441: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.145 nicm 442: if ((fd = dup(STDOUT_FILENO)) == -1)
443: fatal("dup failed");
444: proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0);
1.90 nicm 445:
446: pid = getpid();
1.99 nicm 447: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 448:
1.91 nicm 449: for (ss = environ; *ss != NULL; ss++) {
450: sslen = strlen(*ss) + 1;
1.107 nicm 451: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
452: continue;
453: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 454: }
1.75 nicm 455:
1.99 nicm 456: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 457: }
458:
1.132 nicm 459: /* File write error callback. */
1.114 nicm 460: static void
1.132 nicm 461: client_write_error_callback(__unused struct bufferevent *bev,
462: __unused short what, void *arg)
1.54 nicm 463: {
1.132 nicm 464: struct client_file *cf = arg;
1.54 nicm 465:
1.132 nicm 466: log_debug("write error file %d", cf->stream);
467:
468: bufferevent_free(cf->event);
469: cf->event = NULL;
470:
471: close(cf->fd);
472: cf->fd = -1;
1.134 nicm 473:
474: if (client_exitflag)
475: client_exit();
1.132 nicm 476: }
477:
478: /* File write callback. */
479: static void
480: client_write_callback(__unused struct bufferevent *bev, void *arg)
481: {
482: struct client_file *cf = arg;
483:
484: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
485: bufferevent_free(cf->event);
486: close(cf->fd);
487: RB_REMOVE(client_files, &client_files, cf);
488: file_free(cf);
489: }
1.133 nicm 490:
491: if (client_exitflag)
492: client_exit();
1.132 nicm 493: }
494:
495: /* Open write file. */
496: static void
497: client_write_open(void *data, size_t datalen)
498: {
499: struct msg_write_open *msg = data;
1.135 nicm 500: const char *path;
1.132 nicm 501: struct msg_write_ready reply;
502: struct client_file find, *cf;
503: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
504: int error = 0;
505:
1.135 nicm 506: if (datalen < sizeof *msg)
1.132 nicm 507: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 508: if (datalen == sizeof *msg)
509: path = "-";
510: else
511: path = (const char *)(msg + 1);
512: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 513:
514: find.stream = msg->stream;
515: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
516: cf = file_create(NULL, msg->stream, NULL, NULL);
517: RB_INSERT(client_files, &client_files, cf);
518: } else {
519: error = EBADF;
520: goto reply;
521: }
522: if (cf->closed) {
523: error = EBADF;
524: goto reply;
525: }
526:
527: cf->fd = -1;
528: if (msg->fd == -1)
1.135 nicm 529: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 530: else {
531: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
532: errno = EBADF;
533: else {
534: cf->fd = dup(msg->fd);
1.143 nicm 535: if (~client_flags & CLIENT_CONTROL)
1.132 nicm 536: close(msg->fd); /* can only be used once */
537: }
538: }
539: if (cf->fd == -1) {
540: error = errno;
541: goto reply;
542: }
543:
544: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
545: client_write_error_callback, cf);
546: bufferevent_enable(cf->event, EV_WRITE);
547: goto reply;
548:
549: reply:
550: reply.stream = msg->stream;
551: reply.error = error;
552: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
553: }
554:
555: /* Write to client file. */
556: static void
557: client_write_data(void *data, size_t datalen)
558: {
559: struct msg_write_data *msg = data;
560: struct client_file find, *cf;
1.135 nicm 561: size_t size = datalen - sizeof *msg;
1.132 nicm 562:
1.135 nicm 563: if (datalen < sizeof *msg)
1.132 nicm 564: fatalx("bad MSG_WRITE size");
565: find.stream = msg->stream;
566: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
567: fatalx("unknown stream number");
1.135 nicm 568: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 569:
570: if (cf->event != NULL)
1.135 nicm 571: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 572: }
573:
574: /* Close client file. */
575: static void
576: client_write_close(void *data, size_t datalen)
577: {
578: struct msg_write_close *msg = data;
579: struct client_file find, *cf;
1.54 nicm 580:
1.132 nicm 581: if (datalen != sizeof *msg)
582: fatalx("bad MSG_WRITE_CLOSE size");
583: find.stream = msg->stream;
584: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
585: fatalx("unknown stream number");
586: log_debug("close file %d", cf->stream);
587:
588: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
589: if (cf->event != NULL)
590: bufferevent_free(cf->event);
591: if (cf->fd != -1)
592: close(cf->fd);
593: RB_REMOVE(client_files, &client_files, cf);
594: file_free(cf);
595: }
1.54 nicm 596: }
597:
1.132 nicm 598: /* File read callback. */
1.114 nicm 599: static void
1.132 nicm 600: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 601: {
1.132 nicm 602: struct client_file *cf = arg;
603: void *bdata;
604: size_t bsize;
1.135 nicm 605: struct msg_read_data *msg;
606: size_t msglen;
1.132 nicm 607:
1.135 nicm 608: msg = xmalloc(sizeof *msg);
1.132 nicm 609: for (;;) {
610: bdata = EVBUFFER_DATA(cf->event->input);
611: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 612:
1.132 nicm 613: if (bsize == 0)
1.57 nicm 614: break;
1.136 nicm 615: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
616: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 617: log_debug("read %zu from file %d", bsize, cf->stream);
618:
1.135 nicm 619: msglen = (sizeof *msg) + bsize;
620: msg = xrealloc(msg, msglen);
621: msg->stream = cf->stream;
622: memcpy(msg + 1, bdata, bsize);
623: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 624:
625: evbuffer_drain(cf->event->input, bsize);
626: }
1.135 nicm 627: free(msg);
1.132 nicm 628: }
629:
630: /* File read error callback. */
631: static void
632: client_read_error_callback(__unused struct bufferevent *bev,
633: __unused short what, void *arg)
634: {
635: struct client_file *cf = arg;
636: struct msg_read_done msg;
637:
638: log_debug("read error file %d", cf->stream);
639:
640: msg.stream = cf->stream;
641: msg.error = 0;
642: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
643:
644: bufferevent_free(cf->event);
645: close(cf->fd);
646: RB_REMOVE(client_files, &client_files, cf);
647: file_free(cf);
648: }
649:
650: /* Open read file. */
651: static void
652: client_read_open(void *data, size_t datalen)
653: {
654: struct msg_read_open *msg = data;
1.135 nicm 655: const char *path;
1.132 nicm 656: struct msg_read_done reply;
657: struct client_file find, *cf;
658: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 659: int error;
1.132 nicm 660:
1.135 nicm 661: if (datalen < sizeof *msg)
1.132 nicm 662: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 663: if (datalen == sizeof *msg)
664: path = "-";
665: else
666: path = (const char *)(msg + 1);
667: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 668:
669: find.stream = msg->stream;
670: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
671: cf = file_create(NULL, msg->stream, NULL, NULL);
672: RB_INSERT(client_files, &client_files, cf);
673: } else {
674: error = EBADF;
675: goto reply;
1.57 nicm 676: }
1.132 nicm 677: if (cf->closed) {
678: error = EBADF;
679: goto reply;
680: }
681:
682: cf->fd = -1;
683: if (msg->fd == -1)
1.135 nicm 684: cf->fd = open(path, flags);
1.132 nicm 685: else {
686: if (msg->fd != STDIN_FILENO)
687: errno = EBADF;
688: else {
689: cf->fd = dup(msg->fd);
1.143 nicm 690: if (~client_flags & CLIENT_CONTROL)
691: close(msg->fd); /* can only be used once */
1.132 nicm 692: }
693: }
694: if (cf->fd == -1) {
695: error = errno;
696: goto reply;
697: }
698:
699: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
700: client_read_error_callback, cf);
701: bufferevent_enable(cf->event, EV_READ);
702: return;
703:
704: reply:
705: reply.stream = msg->stream;
706: reply.error = error;
707: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 708: }
709:
1.93 nicm 710: /* Run command in shell; used for -c. */
1.114 nicm 711: static __dead void
1.111 nicm 712: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 713: {
714: const char *name, *ptr;
715: char *argv0;
716:
1.111 nicm 717: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 718:
719: ptr = strrchr(shell, '/');
720: if (ptr != NULL && *(ptr + 1) != '\0')
721: name = ptr + 1;
722: else
723: name = shell;
724: if (client_flags & CLIENT_LOGIN)
725: xasprintf(&argv0, "-%s", name);
726: else
727: xasprintf(&argv0, "%s", name);
728: setenv("SHELL", shell, 1);
729:
1.123 nicm 730: proc_clear_signals(client_proc, 1);
731:
1.93 nicm 732: setblocking(STDIN_FILENO, 1);
733: setblocking(STDOUT_FILENO, 1);
734: setblocking(STDERR_FILENO, 1);
735: closefrom(STDERR_FILENO + 1);
736:
1.111 nicm 737: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 738: fatal("execl failed");
739: }
740:
1.99 nicm 741: /* Callback to handle signals in the client. */
1.114 nicm 742: static void
1.99 nicm 743: client_signal(int sig)
744: {
745: struct sigaction sigact;
746: int status;
747:
748: if (sig == SIGCHLD)
749: waitpid(WAIT_ANY, &status, WNOHANG);
750: else if (!client_attached) {
751: if (sig == SIGTERM)
752: proc_exit(client_proc);
753: } else {
754: switch (sig) {
755: case SIGHUP:
756: client_exitreason = CLIENT_EXIT_LOST_TTY;
757: client_exitval = 1;
758: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
759: break;
760: case SIGTERM:
761: client_exitreason = CLIENT_EXIT_TERMINATED;
762: client_exitval = 1;
763: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
764: break;
765: case SIGWINCH:
766: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
767: break;
768: case SIGCONT:
769: memset(&sigact, 0, sizeof sigact);
770: sigemptyset(&sigact.sa_mask);
771: sigact.sa_flags = SA_RESTART;
772: sigact.sa_handler = SIG_IGN;
773: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
774: fatal("sigaction failed");
775: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
776: break;
777: }
778: }
779: }
780:
781: /* Callback for client read events. */
1.114 nicm 782: static void
1.121 nicm 783: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 784: {
785: if (imsg == NULL) {
786: client_exitreason = CLIENT_EXIT_LOST_SERVER;
787: client_exitval = 1;
1.109 nicm 788: proc_exit(client_proc);
789: return;
790: }
791:
792: if (client_attached)
1.99 nicm 793: client_dispatch_attached(imsg);
794: else
1.121 nicm 795: client_dispatch_wait(imsg);
1.99 nicm 796: }
797:
1.147 ! nicm 798: /* Process an exit message. */
! 799: static void
! 800: client_dispatch_exit_message(char *data, size_t datalen)
! 801: {
! 802: int retval;
! 803:
! 804: if (datalen < sizeof retval && datalen != 0)
! 805: fatalx("bad MSG_EXIT size");
! 806:
! 807: if (datalen >= sizeof retval) {
! 808: memcpy(&retval, data, sizeof retval);
! 809: client_exitval = retval;
! 810: }
! 811:
! 812: if (datalen > sizeof retval) {
! 813: datalen -= sizeof retval;
! 814: data += sizeof retval;
! 815:
! 816: client_exitmessage = xmalloc(datalen);
! 817: memcpy(client_exitmessage, data, datalen);
! 818: client_exitmessage[datalen - 1] = '\0';
! 819:
! 820: client_exitreason = CLIENT_EXIT_MESSAGE_PROVIDED;
! 821: }
! 822: }
! 823:
1.46 nicm 824: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 825: static void
1.121 nicm 826: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 827: {
1.132 nicm 828: char *data;
829: ssize_t datalen;
830: static int pledge_applied;
1.97 nicm 831:
832: /*
833: * "sendfd" is no longer required once all of the identify messages
834: * have been sent. We know the server won't send us anything until that
835: * point (because we don't ask it to), so we can drop "sendfd" once we
836: * get the first message from the server.
837: */
838: if (!pledge_applied) {
1.132 nicm 839: if (pledge(
840: "stdio rpath wpath cpath unix proc exec tty",
841: NULL) != 0)
1.97 nicm 842: fatal("pledge failed");
843: pledge_applied = 1;
1.132 nicm 844: }
1.46 nicm 845:
1.99 nicm 846: data = imsg->data;
847: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 848:
1.99 nicm 849: switch (imsg->hdr.type) {
850: case MSG_EXIT:
851: case MSG_SHUTDOWN:
1.147 ! nicm 852: client_dispatch_exit_message(data, datalen);
1.133 nicm 853: client_exitflag = 1;
854: client_exit();
1.99 nicm 855: break;
856: case MSG_READY:
857: if (datalen != 0)
858: fatalx("bad MSG_READY size");
1.54 nicm 859:
1.99 nicm 860: client_attached = 1;
861: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
862: break;
863: case MSG_VERSION:
864: if (datalen != 0)
865: fatalx("bad MSG_VERSION size");
866:
867: fprintf(stderr, "protocol version mismatch "
868: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 869: imsg->hdr.peerid & 0xff);
1.99 nicm 870: client_exitval = 1;
871: proc_exit(client_proc);
872: break;
873: case MSG_SHELL:
874: if (datalen == 0 || data[datalen - 1] != '\0')
875: fatalx("bad MSG_SHELL string");
876:
1.121 nicm 877: client_exec(data, shell_command);
1.99 nicm 878: /* NOTREACHED */
879: case MSG_DETACH:
880: case MSG_DETACHKILL:
881: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
882: break;
883: case MSG_EXITED:
884: proc_exit(client_proc);
1.132 nicm 885: break;
886: case MSG_READ_OPEN:
887: client_read_open(data, datalen);
888: break;
889: case MSG_WRITE_OPEN:
890: client_write_open(data, datalen);
891: break;
892: case MSG_WRITE:
893: client_write_data(data, datalen);
894: break;
895: case MSG_WRITE_CLOSE:
896: client_write_close(data, datalen);
1.137 nicm 897: break;
898: case MSG_OLDSTDERR:
899: case MSG_OLDSTDIN:
900: case MSG_OLDSTDOUT:
901: fprintf(stderr, "server version is too old for client\n");
902: proc_exit(client_proc);
1.99 nicm 903: break;
1.46 nicm 904: }
905: }
906:
907: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 908: static void
1.99 nicm 909: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 910: {
1.69 nicm 911: struct sigaction sigact;
912: char *data;
1.99 nicm 913: ssize_t datalen;
1.9 nicm 914:
1.99 nicm 915: data = imsg->data;
916: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 917:
1.99 nicm 918: switch (imsg->hdr.type) {
919: case MSG_DETACH:
920: case MSG_DETACHKILL:
921: if (datalen == 0 || data[datalen - 1] != '\0')
922: fatalx("bad MSG_DETACH string");
923:
924: client_exitsession = xstrdup(data);
925: client_exittype = imsg->hdr.type;
926: if (imsg->hdr.type == MSG_DETACHKILL)
927: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
928: else
929: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 930: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
931: break;
932: case MSG_EXEC:
933: if (datalen == 0 || data[datalen - 1] != '\0' ||
934: strlen(data) + 1 == (size_t)datalen)
935: fatalx("bad MSG_EXEC string");
936: client_execcmd = xstrdup(data);
937: client_execshell = xstrdup(data + strlen(data) + 1);
938:
939: client_exittype = imsg->hdr.type;
1.99 nicm 940: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
941: break;
942: case MSG_EXIT:
1.147 ! nicm 943: client_dispatch_exit_message(data, datalen);
! 944: if (client_exitreason == CLIENT_EXIT_NONE)
! 945: client_exitreason = CLIENT_EXIT_EXITED;
1.99 nicm 946: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
947: break;
948: case MSG_EXITED:
949: if (datalen != 0)
950: fatalx("bad MSG_EXITED size");
1.9 nicm 951:
1.99 nicm 952: proc_exit(client_proc);
953: break;
954: case MSG_SHUTDOWN:
955: if (datalen != 0)
956: fatalx("bad MSG_SHUTDOWN size");
957:
958: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
959: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
960: client_exitval = 1;
961: break;
962: case MSG_SUSPEND:
963: if (datalen != 0)
964: fatalx("bad MSG_SUSPEND size");
965:
966: memset(&sigact, 0, sizeof sigact);
967: sigemptyset(&sigact.sa_mask);
968: sigact.sa_flags = SA_RESTART;
969: sigact.sa_handler = SIG_DFL;
970: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
971: fatal("sigaction failed");
972: kill(getpid(), SIGTSTP);
973: break;
974: case MSG_LOCK:
975: if (datalen == 0 || data[datalen - 1] != '\0')
976: fatalx("bad MSG_LOCK string");
1.9 nicm 977:
1.99 nicm 978: system(data);
979: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
980: break;
1.9 nicm 981: }
1.1 nicm 982: }
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