Annotation of src/usr.bin/tmux/client.c, Revision 1.148
1.148 ! nicm 1: /* $OpenBSD: client.c,v 1.147 2020/06/10 07:27:10 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 *);
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;
1.148 ! nicm 250: size_t size, linesize = 0;
! 251: ssize_t linelen;
! 252: char *line = NULL;
1.46 nicm 253:
1.99 nicm 254: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
255: signal(SIGCHLD, SIG_IGN);
256:
1.46 nicm 257: /* Set up the initial command. */
1.121 nicm 258: if (shell_command != NULL) {
1.46 nicm 259: msg = MSG_SHELL;
1.139 nicm 260: flags |= CLIENT_STARTSERVER;
1.46 nicm 261: } else if (argc == 0) {
262: msg = MSG_COMMAND;
1.138 nicm 263: flags |= CLIENT_STARTSERVER;
1.46 nicm 264: } else {
265: msg = MSG_COMMAND;
266:
267: /*
268: * It sucks parsing the command string twice (in client and
269: * later in server) but it is necessary to get the start server
270: * flag.
271: */
1.129 nicm 272: pr = cmd_parse_from_arguments(argc, argv, NULL);
273: if (pr->status == CMD_PARSE_SUCCESS) {
1.141 nicm 274: if (cmd_list_any_have(pr->cmdlist, CMD_STARTSERVER))
275: flags |= CLIENT_STARTSERVER;
1.129 nicm 276: cmd_list_free(pr->cmdlist);
277: } else
278: free(pr->error);
1.46 nicm 279: }
280:
1.109 nicm 281: /* Create client process structure (starts logging). */
1.122 nicm 282: client_proc = proc_start("client");
283: proc_set_signals(client_proc, client_signal);
1.109 nicm 284:
1.148 ! nicm 285: /* Save the flags. */
! 286: client_flags = flags;
! 287: log_debug("flags are %#llx", client_flags);
! 288:
1.82 nicm 289: /* Initialize the client socket and start the server. */
1.138 nicm 290: fd = client_connect(base, socket_path, client_flags);
1.46 nicm 291: if (fd == -1) {
1.87 nicm 292: if (errno == ECONNREFUSED) {
293: fprintf(stderr, "no server running on %s\n",
294: socket_path);
295: } else {
296: fprintf(stderr, "error connecting to %s (%s)\n",
297: socket_path, strerror(errno));
298: }
1.46 nicm 299: return (1);
300: }
1.121 nicm 301: client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
1.99 nicm 302:
1.97 nicm 303: /* Save these before pledge(). */
1.128 nicm 304: if ((cwd = find_cwd()) == NULL && (cwd = find_home()) == NULL)
1.126 nicm 305: cwd = "/";
1.97 nicm 306: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
307: ttynam = "";
308:
309: /*
310: * Drop privileges for client. "proc exec" is needed for -c and for
311: * locking (which uses system(3)).
312: *
313: * "tty" is needed to restore termios(4) and also for some reason -CC
314: * does not work properly without it (input is not recognised).
315: *
316: * "sendfd" is dropped later in client_dispatch_wait().
317: */
1.132 nicm 318: if (pledge(
319: "stdio rpath wpath cpath unix sendfd proc exec tty",
320: NULL) != 0)
1.97 nicm 321: fatal("pledge failed");
322:
323: /* Free stuff that is not used in the client. */
1.119 nicm 324: if (ptm_fd != -1)
325: close(ptm_fd);
1.100 nicm 326: options_free(global_options);
327: options_free(global_s_options);
328: options_free(global_w_options);
1.101 nicm 329: environ_free(global_environ);
1.46 nicm 330:
1.132 nicm 331: /* Set up control mode. */
1.93 nicm 332: if (client_flags & CLIENT_CONTROLCONTROL) {
1.118 nicm 333: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
334: fprintf(stderr, "tcgetattr failed: %s\n",
335: strerror(errno));
336: return (1);
337: }
1.56 nicm 338: cfmakeraw(&tio);
339: tio.c_iflag = ICRNL|IXANY;
340: tio.c_oflag = OPOST|ONLCR;
341: tio.c_lflag = NOKERNINFO;
342: tio.c_cflag = CREAD|CS8|HUPCL;
343: tio.c_cc[VMIN] = 1;
344: tio.c_cc[VTIME] = 0;
345: cfsetispeed(&tio, cfgetispeed(&saved_tio));
346: cfsetospeed(&tio, cfgetospeed(&saved_tio));
347: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
348: }
1.1 nicm 349:
1.71 nicm 350: /* Send identify messages. */
1.142 nicm 351: client_send_identify(ttynam, cwd, feat);
1.1 nicm 352:
1.46 nicm 353: /* Send first command. */
354: if (msg == MSG_COMMAND) {
1.70 nicm 355: /* How big is the command? */
356: size = 0;
357: for (i = 0; i < argc; i++)
358: size += strlen(argv[i]) + 1;
1.124 nicm 359: if (size > MAX_IMSGSIZE - (sizeof *data)) {
360: fprintf(stderr, "command too long\n");
361: return (1);
362: }
1.70 nicm 363: data = xmalloc((sizeof *data) + size);
1.46 nicm 364:
365: /* Prepare command for server. */
1.70 nicm 366: data->argc = argc;
1.83 nicm 367: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
1.55 nicm 368: fprintf(stderr, "command too long\n");
1.70 nicm 369: free(data);
1.46 nicm 370: return (1);
371: }
1.70 nicm 372: size += sizeof *data;
1.46 nicm 373:
1.70 nicm 374: /* Send the command. */
1.99 nicm 375: if (proc_send(client_peer, msg, -1, data, size) != 0) {
1.70 nicm 376: fprintf(stderr, "failed to send command\n");
377: free(data);
378: return (1);
379: }
380: free(data);
1.46 nicm 381: } else if (msg == MSG_SHELL)
1.99 nicm 382: proc_send(client_peer, msg, -1, NULL, 0);
1.1 nicm 383:
1.99 nicm 384: /* Start main loop. */
385: proc_loop(client_proc, NULL);
1.46 nicm 386:
1.115 nicm 387: /* Run command if user requested exec, instead of exiting. */
388: if (client_exittype == MSG_EXEC) {
389: if (client_flags & CLIENT_CONTROLCONTROL)
390: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
391: client_exec(client_execshell, client_execcmd);
392: }
393:
1.146 nicm 394: /* Restore streams to blocking. */
395: setblocking(STDIN_FILENO, 1);
396: setblocking(STDOUT_FILENO, 1);
397: setblocking(STDERR_FILENO, 1);
398:
1.46 nicm 399: /* Print the exit message, if any, and exit. */
1.48 nicm 400: if (client_attached) {
1.93 nicm 401: if (client_exitreason != CLIENT_EXIT_NONE)
1.52 nicm 402: printf("[%s]\n", client_exit_message());
1.48 nicm 403:
404: ppid = getppid();
405: if (client_exittype == MSG_DETACHKILL && ppid > 1)
406: kill(ppid, SIGHUP);
1.146 nicm 407: } else if (client_flags & CLIENT_CONTROL) {
1.68 nicm 408: if (client_exitreason != CLIENT_EXIT_NONE)
409: printf("%%exit %s\n", client_exit_message());
410: else
411: printf("%%exit\n");
1.148 ! nicm 412: fflush(stdout);
! 413: if (client_flags & CLIENT_CONTROL_WAITEXIT) {
! 414: setvbuf(stdin, NULL, _IOLBF, 0);
! 415: for (;;) {
! 416: linelen = getline(&line, &linesize, stdin);
! 417: if (linelen <= 1)
! 418: break;
! 419: }
! 420: free(line);
! 421: }
1.146 nicm 422: if (client_flags & CLIENT_CONTROLCONTROL) {
423: printf("\033\\");
1.148 ! nicm 424: fflush(stdout);
1.146 nicm 425: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
426: }
1.112 nicm 427: } else if (client_exitreason != CLIENT_EXIT_NONE)
1.109 nicm 428: fprintf(stderr, "%s\n", client_exit_message());
1.46 nicm 429: return (client_exitval);
1.1 nicm 430: }
431:
1.71 nicm 432: /* Send identify messages to server. */
1.114 nicm 433: static void
1.142 nicm 434: client_send_identify(const char *ttynam, const char *cwd, int feat)
1.26 nicm 435: {
1.90 nicm 436: const char *s;
1.71 nicm 437: char **ss;
1.91 nicm 438: size_t sslen;
1.93 nicm 439: int fd, flags = client_flags;
1.90 nicm 440: pid_t pid;
1.71 nicm 441:
1.99 nicm 442: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
1.71 nicm 443:
444: if ((s = getenv("TERM")) == NULL)
445: s = "";
1.99 nicm 446: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
1.142 nicm 447: proc_send(client_peer, MSG_IDENTIFY_FEATURES, -1, &feat, sizeof feat);
1.71 nicm 448:
1.107 nicm 449: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
450: strlen(ttynam) + 1);
1.99 nicm 451: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
1.26 nicm 452:
1.50 nicm 453: if ((fd = dup(STDIN_FILENO)) == -1)
454: fatal("dup failed");
1.99 nicm 455: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.145 nicm 456: if ((fd = dup(STDOUT_FILENO)) == -1)
457: fatal("dup failed");
458: proc_send(client_peer, MSG_IDENTIFY_STDOUT, fd, NULL, 0);
1.90 nicm 459:
460: pid = getpid();
1.99 nicm 461: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
1.26 nicm 462:
1.91 nicm 463: for (ss = environ; *ss != NULL; ss++) {
464: sslen = strlen(*ss) + 1;
1.107 nicm 465: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
466: continue;
467: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
1.91 nicm 468: }
1.75 nicm 469:
1.99 nicm 470: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
1.30 nicm 471: }
472:
1.132 nicm 473: /* File write error callback. */
1.114 nicm 474: static void
1.132 nicm 475: client_write_error_callback(__unused struct bufferevent *bev,
476: __unused short what, void *arg)
1.54 nicm 477: {
1.132 nicm 478: struct client_file *cf = arg;
1.54 nicm 479:
1.132 nicm 480: log_debug("write error file %d", cf->stream);
481:
482: bufferevent_free(cf->event);
483: cf->event = NULL;
484:
485: close(cf->fd);
486: cf->fd = -1;
1.134 nicm 487:
488: if (client_exitflag)
489: client_exit();
1.132 nicm 490: }
491:
492: /* File write callback. */
493: static void
494: client_write_callback(__unused struct bufferevent *bev, void *arg)
495: {
496: struct client_file *cf = arg;
497:
498: if (cf->closed && EVBUFFER_LENGTH(cf->event->output) == 0) {
499: bufferevent_free(cf->event);
500: close(cf->fd);
501: RB_REMOVE(client_files, &client_files, cf);
502: file_free(cf);
503: }
1.133 nicm 504:
505: if (client_exitflag)
506: client_exit();
1.132 nicm 507: }
508:
509: /* Open write file. */
510: static void
511: client_write_open(void *data, size_t datalen)
512: {
513: struct msg_write_open *msg = data;
1.135 nicm 514: const char *path;
1.132 nicm 515: struct msg_write_ready reply;
516: struct client_file find, *cf;
517: const int flags = O_NONBLOCK|O_WRONLY|O_CREAT;
518: int error = 0;
519:
1.135 nicm 520: if (datalen < sizeof *msg)
1.132 nicm 521: fatalx("bad MSG_WRITE_OPEN size");
1.135 nicm 522: if (datalen == sizeof *msg)
523: path = "-";
524: else
525: path = (const char *)(msg + 1);
526: log_debug("open write file %d %s", msg->stream, path);
1.132 nicm 527:
528: find.stream = msg->stream;
529: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
530: cf = file_create(NULL, msg->stream, NULL, NULL);
531: RB_INSERT(client_files, &client_files, cf);
532: } else {
533: error = EBADF;
534: goto reply;
535: }
536: if (cf->closed) {
537: error = EBADF;
538: goto reply;
539: }
540:
541: cf->fd = -1;
542: if (msg->fd == -1)
1.135 nicm 543: cf->fd = open(path, msg->flags|flags, 0644);
1.132 nicm 544: else {
545: if (msg->fd != STDOUT_FILENO && msg->fd != STDERR_FILENO)
546: errno = EBADF;
547: else {
548: cf->fd = dup(msg->fd);
1.143 nicm 549: if (~client_flags & CLIENT_CONTROL)
1.132 nicm 550: close(msg->fd); /* can only be used once */
551: }
552: }
553: if (cf->fd == -1) {
554: error = errno;
555: goto reply;
556: }
557:
558: cf->event = bufferevent_new(cf->fd, NULL, client_write_callback,
559: client_write_error_callback, cf);
560: bufferevent_enable(cf->event, EV_WRITE);
561: goto reply;
562:
563: reply:
564: reply.stream = msg->stream;
565: reply.error = error;
566: proc_send(client_peer, MSG_WRITE_READY, -1, &reply, sizeof reply);
567: }
568:
569: /* Write to client file. */
570: static void
571: client_write_data(void *data, size_t datalen)
572: {
573: struct msg_write_data *msg = data;
574: struct client_file find, *cf;
1.135 nicm 575: size_t size = datalen - sizeof *msg;
1.132 nicm 576:
1.135 nicm 577: if (datalen < sizeof *msg)
1.132 nicm 578: fatalx("bad MSG_WRITE size");
579: find.stream = msg->stream;
580: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
581: fatalx("unknown stream number");
1.135 nicm 582: log_debug("write %zu to file %d", size, cf->stream);
1.132 nicm 583:
584: if (cf->event != NULL)
1.135 nicm 585: bufferevent_write(cf->event, msg + 1, size);
1.132 nicm 586: }
587:
588: /* Close client file. */
589: static void
590: client_write_close(void *data, size_t datalen)
591: {
592: struct msg_write_close *msg = data;
593: struct client_file find, *cf;
1.54 nicm 594:
1.132 nicm 595: if (datalen != sizeof *msg)
596: fatalx("bad MSG_WRITE_CLOSE size");
597: find.stream = msg->stream;
598: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL)
599: fatalx("unknown stream number");
600: log_debug("close file %d", cf->stream);
601:
602: if (cf->event == NULL || EVBUFFER_LENGTH(cf->event->output) == 0) {
603: if (cf->event != NULL)
604: bufferevent_free(cf->event);
605: if (cf->fd != -1)
606: close(cf->fd);
607: RB_REMOVE(client_files, &client_files, cf);
608: file_free(cf);
609: }
1.54 nicm 610: }
611:
1.132 nicm 612: /* File read callback. */
1.114 nicm 613: static void
1.132 nicm 614: client_read_callback(__unused struct bufferevent *bev, void *arg)
1.57 nicm 615: {
1.132 nicm 616: struct client_file *cf = arg;
617: void *bdata;
618: size_t bsize;
1.135 nicm 619: struct msg_read_data *msg;
620: size_t msglen;
1.132 nicm 621:
1.135 nicm 622: msg = xmalloc(sizeof *msg);
1.132 nicm 623: for (;;) {
624: bdata = EVBUFFER_DATA(cf->event->input);
625: bsize = EVBUFFER_LENGTH(cf->event->input);
1.57 nicm 626:
1.132 nicm 627: if (bsize == 0)
1.57 nicm 628: break;
1.136 nicm 629: if (bsize > MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg)
630: bsize = MAX_IMSGSIZE - IMSG_HEADER_SIZE - sizeof *msg;
1.132 nicm 631: log_debug("read %zu from file %d", bsize, cf->stream);
632:
1.135 nicm 633: msglen = (sizeof *msg) + bsize;
634: msg = xrealloc(msg, msglen);
635: msg->stream = cf->stream;
636: memcpy(msg + 1, bdata, bsize);
637: proc_send(client_peer, MSG_READ, -1, msg, msglen);
1.132 nicm 638:
639: evbuffer_drain(cf->event->input, bsize);
640: }
1.135 nicm 641: free(msg);
1.132 nicm 642: }
643:
644: /* File read error callback. */
645: static void
646: client_read_error_callback(__unused struct bufferevent *bev,
647: __unused short what, void *arg)
648: {
649: struct client_file *cf = arg;
650: struct msg_read_done msg;
651:
652: log_debug("read error file %d", cf->stream);
653:
654: msg.stream = cf->stream;
655: msg.error = 0;
656: proc_send(client_peer, MSG_READ_DONE, -1, &msg, sizeof msg);
657:
658: bufferevent_free(cf->event);
659: close(cf->fd);
660: RB_REMOVE(client_files, &client_files, cf);
661: file_free(cf);
662: }
663:
664: /* Open read file. */
665: static void
666: client_read_open(void *data, size_t datalen)
667: {
668: struct msg_read_open *msg = data;
1.135 nicm 669: const char *path;
1.132 nicm 670: struct msg_read_done reply;
671: struct client_file find, *cf;
672: const int flags = O_NONBLOCK|O_RDONLY;
1.140 nicm 673: int error;
1.132 nicm 674:
1.135 nicm 675: if (datalen < sizeof *msg)
1.132 nicm 676: fatalx("bad MSG_READ_OPEN size");
1.135 nicm 677: if (datalen == sizeof *msg)
678: path = "-";
679: else
680: path = (const char *)(msg + 1);
681: log_debug("open read file %d %s", msg->stream, path);
1.132 nicm 682:
683: find.stream = msg->stream;
684: if ((cf = RB_FIND(client_files, &client_files, &find)) == NULL) {
685: cf = file_create(NULL, msg->stream, NULL, NULL);
686: RB_INSERT(client_files, &client_files, cf);
687: } else {
688: error = EBADF;
689: goto reply;
1.57 nicm 690: }
1.132 nicm 691: if (cf->closed) {
692: error = EBADF;
693: goto reply;
694: }
695:
696: cf->fd = -1;
697: if (msg->fd == -1)
1.135 nicm 698: cf->fd = open(path, flags);
1.132 nicm 699: else {
700: if (msg->fd != STDIN_FILENO)
701: errno = EBADF;
702: else {
703: cf->fd = dup(msg->fd);
1.143 nicm 704: if (~client_flags & CLIENT_CONTROL)
705: close(msg->fd); /* can only be used once */
1.132 nicm 706: }
707: }
708: if (cf->fd == -1) {
709: error = errno;
710: goto reply;
711: }
712:
713: cf->event = bufferevent_new(cf->fd, client_read_callback, NULL,
714: client_read_error_callback, cf);
715: bufferevent_enable(cf->event, EV_READ);
716: return;
717:
718: reply:
719: reply.stream = msg->stream;
720: reply.error = error;
721: proc_send(client_peer, MSG_READ_DONE, -1, &reply, sizeof reply);
1.57 nicm 722: }
723:
1.93 nicm 724: /* Run command in shell; used for -c. */
1.114 nicm 725: static __dead void
1.111 nicm 726: client_exec(const char *shell, const char *shellcmd)
1.93 nicm 727: {
728: const char *name, *ptr;
729: char *argv0;
730:
1.111 nicm 731: log_debug("shell %s, command %s", shell, shellcmd);
1.93 nicm 732:
733: ptr = strrchr(shell, '/');
734: if (ptr != NULL && *(ptr + 1) != '\0')
735: name = ptr + 1;
736: else
737: name = shell;
738: if (client_flags & CLIENT_LOGIN)
739: xasprintf(&argv0, "-%s", name);
740: else
741: xasprintf(&argv0, "%s", name);
742: setenv("SHELL", shell, 1);
743:
1.123 nicm 744: proc_clear_signals(client_proc, 1);
745:
1.93 nicm 746: setblocking(STDIN_FILENO, 1);
747: setblocking(STDOUT_FILENO, 1);
748: setblocking(STDERR_FILENO, 1);
749: closefrom(STDERR_FILENO + 1);
750:
1.111 nicm 751: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
1.93 nicm 752: fatal("execl failed");
753: }
754:
1.99 nicm 755: /* Callback to handle signals in the client. */
1.114 nicm 756: static void
1.99 nicm 757: client_signal(int sig)
758: {
759: struct sigaction sigact;
760: int status;
761:
762: if (sig == SIGCHLD)
763: waitpid(WAIT_ANY, &status, WNOHANG);
764: else if (!client_attached) {
765: if (sig == SIGTERM)
766: proc_exit(client_proc);
767: } else {
768: switch (sig) {
769: case SIGHUP:
770: client_exitreason = CLIENT_EXIT_LOST_TTY;
771: client_exitval = 1;
772: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
773: break;
774: case SIGTERM:
775: client_exitreason = CLIENT_EXIT_TERMINATED;
776: client_exitval = 1;
777: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
778: break;
779: case SIGWINCH:
780: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
781: break;
782: case SIGCONT:
783: memset(&sigact, 0, sizeof sigact);
784: sigemptyset(&sigact.sa_mask);
785: sigact.sa_flags = SA_RESTART;
786: sigact.sa_handler = SIG_IGN;
787: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
788: fatal("sigaction failed");
789: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
790: break;
791: }
792: }
793: }
794:
795: /* Callback for client read events. */
1.114 nicm 796: static void
1.121 nicm 797: client_dispatch(struct imsg *imsg, __unused void *arg)
1.99 nicm 798: {
799: if (imsg == NULL) {
800: client_exitreason = CLIENT_EXIT_LOST_SERVER;
801: client_exitval = 1;
1.109 nicm 802: proc_exit(client_proc);
803: return;
804: }
805:
806: if (client_attached)
1.99 nicm 807: client_dispatch_attached(imsg);
808: else
1.121 nicm 809: client_dispatch_wait(imsg);
1.99 nicm 810: }
811:
1.147 nicm 812: /* Process an exit message. */
813: static void
814: client_dispatch_exit_message(char *data, size_t datalen)
815: {
816: int retval;
817:
818: if (datalen < sizeof retval && datalen != 0)
819: fatalx("bad MSG_EXIT size");
820:
821: if (datalen >= sizeof retval) {
822: memcpy(&retval, data, sizeof retval);
823: client_exitval = retval;
824: }
825:
826: if (datalen > sizeof retval) {
827: datalen -= sizeof retval;
828: data += sizeof retval;
829:
830: client_exitmessage = xmalloc(datalen);
831: memcpy(client_exitmessage, data, datalen);
832: client_exitmessage[datalen - 1] = '\0';
833:
834: client_exitreason = CLIENT_EXIT_MESSAGE_PROVIDED;
835: }
836: }
837:
1.46 nicm 838: /* Dispatch imsgs when in wait state (before MSG_READY). */
1.114 nicm 839: static void
1.121 nicm 840: client_dispatch_wait(struct imsg *imsg)
1.46 nicm 841: {
1.132 nicm 842: char *data;
843: ssize_t datalen;
844: static int pledge_applied;
1.97 nicm 845:
846: /*
847: * "sendfd" is no longer required once all of the identify messages
848: * have been sent. We know the server won't send us anything until that
849: * point (because we don't ask it to), so we can drop "sendfd" once we
850: * get the first message from the server.
851: */
852: if (!pledge_applied) {
1.132 nicm 853: if (pledge(
854: "stdio rpath wpath cpath unix proc exec tty",
855: NULL) != 0)
1.97 nicm 856: fatal("pledge failed");
857: pledge_applied = 1;
1.132 nicm 858: }
1.46 nicm 859:
1.99 nicm 860: data = imsg->data;
861: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.60 nicm 862:
1.99 nicm 863: switch (imsg->hdr.type) {
864: case MSG_EXIT:
865: case MSG_SHUTDOWN:
1.147 nicm 866: client_dispatch_exit_message(data, datalen);
1.133 nicm 867: client_exitflag = 1;
868: client_exit();
1.99 nicm 869: break;
870: case MSG_READY:
871: if (datalen != 0)
872: fatalx("bad MSG_READY size");
1.54 nicm 873:
1.99 nicm 874: client_attached = 1;
875: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
876: break;
877: case MSG_VERSION:
878: if (datalen != 0)
879: fatalx("bad MSG_VERSION size");
880:
881: fprintf(stderr, "protocol version mismatch "
882: "(client %d, server %u)\n", PROTOCOL_VERSION,
1.103 nicm 883: imsg->hdr.peerid & 0xff);
1.99 nicm 884: client_exitval = 1;
885: proc_exit(client_proc);
886: break;
1.148 ! nicm 887: case MSG_FLAGS:
! 888: if (datalen != sizeof client_flags)
! 889: fatalx("bad MSG_FLAGS string");
! 890:
! 891: memcpy(&client_flags, data, sizeof client_flags);
! 892: log_debug("new flags are %#llx", client_flags);
! 893: break;
1.99 nicm 894: case MSG_SHELL:
895: if (datalen == 0 || data[datalen - 1] != '\0')
896: fatalx("bad MSG_SHELL string");
897:
1.121 nicm 898: client_exec(data, shell_command);
1.99 nicm 899: /* NOTREACHED */
900: case MSG_DETACH:
901: case MSG_DETACHKILL:
902: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
903: break;
904: case MSG_EXITED:
905: proc_exit(client_proc);
1.132 nicm 906: break;
907: case MSG_READ_OPEN:
908: client_read_open(data, datalen);
909: break;
910: case MSG_WRITE_OPEN:
911: client_write_open(data, datalen);
912: break;
913: case MSG_WRITE:
914: client_write_data(data, datalen);
915: break;
916: case MSG_WRITE_CLOSE:
917: client_write_close(data, datalen);
1.137 nicm 918: break;
919: case MSG_OLDSTDERR:
920: case MSG_OLDSTDIN:
921: case MSG_OLDSTDOUT:
922: fprintf(stderr, "server version is too old for client\n");
923: proc_exit(client_proc);
1.99 nicm 924: break;
1.46 nicm 925: }
926: }
927:
928: /* Dispatch imsgs in attached state (after MSG_READY). */
1.114 nicm 929: static void
1.99 nicm 930: client_dispatch_attached(struct imsg *imsg)
1.9 nicm 931: {
1.69 nicm 932: struct sigaction sigact;
933: char *data;
1.99 nicm 934: ssize_t datalen;
1.9 nicm 935:
1.99 nicm 936: data = imsg->data;
937: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
1.12 nicm 938:
1.99 nicm 939: switch (imsg->hdr.type) {
1.148 ! nicm 940: case MSG_FLAGS:
! 941: if (datalen != sizeof client_flags)
! 942: fatalx("bad MSG_FLAGS string");
! 943:
! 944: memcpy(&client_flags, data, sizeof client_flags);
! 945: log_debug("new flags are %#llx", client_flags);
! 946: break;
1.99 nicm 947: case MSG_DETACH:
948: case MSG_DETACHKILL:
949: if (datalen == 0 || data[datalen - 1] != '\0')
950: fatalx("bad MSG_DETACH string");
951:
952: client_exitsession = xstrdup(data);
953: client_exittype = imsg->hdr.type;
954: if (imsg->hdr.type == MSG_DETACHKILL)
955: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
956: else
957: client_exitreason = CLIENT_EXIT_DETACHED;
1.115 nicm 958: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
959: break;
960: case MSG_EXEC:
961: if (datalen == 0 || data[datalen - 1] != '\0' ||
962: strlen(data) + 1 == (size_t)datalen)
963: fatalx("bad MSG_EXEC string");
964: client_execcmd = xstrdup(data);
965: client_execshell = xstrdup(data + strlen(data) + 1);
966:
967: client_exittype = imsg->hdr.type;
1.99 nicm 968: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
969: break;
970: case MSG_EXIT:
1.147 nicm 971: client_dispatch_exit_message(data, datalen);
972: if (client_exitreason == CLIENT_EXIT_NONE)
973: client_exitreason = CLIENT_EXIT_EXITED;
1.99 nicm 974: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
975: break;
976: case MSG_EXITED:
977: if (datalen != 0)
978: fatalx("bad MSG_EXITED size");
1.9 nicm 979:
1.99 nicm 980: proc_exit(client_proc);
981: break;
982: case MSG_SHUTDOWN:
983: if (datalen != 0)
984: fatalx("bad MSG_SHUTDOWN size");
985:
986: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
987: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
988: client_exitval = 1;
989: break;
990: case MSG_SUSPEND:
991: if (datalen != 0)
992: fatalx("bad MSG_SUSPEND size");
993:
994: memset(&sigact, 0, sizeof sigact);
995: sigemptyset(&sigact.sa_mask);
996: sigact.sa_flags = SA_RESTART;
997: sigact.sa_handler = SIG_DFL;
998: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
999: fatal("sigaction failed");
1000: kill(getpid(), SIGTSTP);
1001: break;
1002: case MSG_LOCK:
1003: if (datalen == 0 || data[datalen - 1] != '\0')
1004: fatalx("bad MSG_LOCK string");
1.9 nicm 1005:
1.99 nicm 1006: system(data);
1007: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
1008: break;
1.9 nicm 1009: }
1.1 nicm 1010: }
![[BACK]](/icons/back.gif){kind=icon}
Return to client.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / tmux