Annotation of src/usr.bin/tmux/client.c, Revision 1.46
1.46 ! nicm 1: /* $OpenBSD: client.c,v 1.45 2010/10/16 08:31:55 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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>
21: #include <sys/stat.h>
22: #include <sys/un.h>
23: #include <sys/wait.h>
24:
25: #include <errno.h>
1.30 nicm 26: #include <event.h>
1.1 nicm 27: #include <fcntl.h>
28: #include <pwd.h>
29: #include <stdlib.h>
30: #include <string.h>
31: #include <unistd.h>
32:
33: #include "tmux.h"
34:
1.25 nicm 35: struct imsgbuf client_ibuf;
1.30 nicm 36: struct event client_event;
1.25 nicm 37: const char *client_exitmsg;
1.32 nicm 38: int client_exitval;
1.46 ! nicm 39: int client_attached;
1.1 nicm 40:
1.46 ! nicm 41: int client_connect(char *, int);
1.30 nicm 42: void client_send_identify(int);
43: void client_send_environ(void);
44: void client_write_server(enum msgtype, void *, size_t);
1.31 nicm 45: void client_update_event(void);
1.30 nicm 46: void client_signal(int, short, void *);
47: void client_callback(int, short, void *);
1.46 ! nicm 48: int client_dispatch_attached(void);
! 49: int client_dispatch_wait(void *);
1.25 nicm 50:
1.46 ! nicm 51: /* Connect client to server. */
! 52: int
! 53: client_connect(char *path, int start_server)
1.1 nicm 54: {
1.26 nicm 55: struct sockaddr_un sa;
56: size_t size;
57: int fd, mode;
1.1 nicm 58:
59: memset(&sa, 0, sizeof sa);
60: sa.sun_family = AF_UNIX;
61: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
62: if (size >= sizeof sa.sun_path) {
63: errno = ENAMETOOLONG;
1.46 ! nicm 64: return (-1);
1.1 nicm 65: }
66:
1.10 nicm 67: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 68: fatal("socket failed");
1.1 nicm 69:
1.10 nicm 70: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.46 ! nicm 71: if (!start_server)
! 72: goto failed;
1.28 nicm 73: switch (errno) {
74: case ECONNREFUSED:
75: if (unlink(path) != 0)
1.46 ! nicm 76: goto failed;
1.28 nicm 77: /* FALLTHROUGH */
78: case ENOENT:
1.46 ! nicm 79: if ((fd = server_start()) == -1)
! 80: goto failed;
! 81: break;
! 82: default:
! 83: goto failed;
1.1 nicm 84: }
85: }
86:
1.10 nicm 87: if ((mode = fcntl(fd, F_GETFL)) == -1)
1.1 nicm 88: fatal("fcntl failed");
1.10 nicm 89: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
1.1 nicm 90: fatal("fcntl failed");
1.46 ! nicm 91: return (fd);
! 92:
! 93: failed:
! 94: close(fd);
! 95: return (-1);
! 96: }
! 97:
! 98: /* Client main loop. */
! 99: int
! 100: client_main(int argc, char **argv, int flags)
! 101: {
! 102: struct cmd *cmd;
! 103: struct cmd_list *cmdlist;
! 104: struct msg_command_data cmddata;
! 105: int cmdflags, fd;
! 106: enum msgtype msg;
! 107: char *cause;
! 108:
! 109: /* Set up the initial command. */
! 110: cmdflags = 0;
! 111: if (shell_cmd != NULL) {
! 112: msg = MSG_SHELL;
! 113: cmdflags = CMD_STARTSERVER;
! 114: } else if (argc == 0) {
! 115: msg = MSG_COMMAND;
! 116: cmdflags = CMD_STARTSERVER|CMD_SENDENVIRON|CMD_CANTNEST;
! 117: } else {
! 118: msg = MSG_COMMAND;
! 119:
! 120: /*
! 121: * It sucks parsing the command string twice (in client and
! 122: * later in server) but it is necessary to get the start server
! 123: * flag.
! 124: */
! 125: if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
! 126: log_warnx("%s", cause);
! 127: return (1);
! 128: }
! 129: cmdflags &= ~CMD_STARTSERVER;
! 130: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
! 131: if (cmd->entry->flags & CMD_STARTSERVER)
! 132: cmdflags |= CMD_STARTSERVER;
! 133: if (cmd->entry->flags & CMD_SENDENVIRON)
! 134: cmdflags |= CMD_SENDENVIRON;
! 135: if (cmd->entry->flags & CMD_CANTNEST)
! 136: cmdflags |= CMD_CANTNEST;
! 137: }
! 138: cmd_list_free(cmdlist);
! 139: }
! 140:
! 141: /*
! 142: * Check if this could be a nested session, if the command can't nest:
! 143: * if the socket path matches $TMUX, this is probably the same server.
! 144: */
! 145: if (shell_cmd == NULL && environ_path != NULL &&
! 146: cmdflags & CMD_CANTNEST && strcmp(socket_path, environ_path) == 0) {
! 147: log_warnx("sessions should be nested with care. "
! 148: "unset $TMUX to force.");
! 149: return (1);
! 150: }
! 151:
! 152: /* Initialise the client socket and start the server. */
! 153: fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
! 154: if (fd == -1) {
! 155: log_warn("failed to connect to server");
! 156: return (1);
! 157: }
! 158:
! 159: /* Set process title, log and signals now this is the client. */
! 160: setproctitle("client (%s)", socket_path);
! 161: logfile("client");
! 162:
! 163: /* Create imsg. */
1.25 nicm 164: imsg_init(&client_ibuf, fd);
1.46 ! nicm 165: event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
! 166:
! 167: /* Establish signal handlers. */
! 168: set_signals(client_signal);
1.1 nicm 169:
1.46 ! nicm 170: /* Send initial environment. */
1.11 nicm 171: if (cmdflags & CMD_SENDENVIRON)
1.25 nicm 172: client_send_environ();
1.42 nicm 173: client_send_identify(flags);
1.1 nicm 174:
1.46 ! nicm 175: /* Send first command. */
! 176: if (msg == MSG_COMMAND) {
! 177: /* Fill in command line arguments. */
! 178: cmddata.pid = environ_pid;
! 179: cmddata.idx = environ_idx;
! 180:
! 181: /* Prepare command for server. */
! 182: cmddata.argc = argc;
! 183: if (cmd_pack_argv(
! 184: argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
! 185: log_warnx("command too long");
! 186: return (1);
! 187: }
! 188:
! 189: client_write_server(msg, &cmddata, sizeof cmddata);
! 190: } else if (msg == MSG_SHELL)
! 191: client_write_server(msg, NULL, 0);
1.1 nicm 192:
1.46 ! nicm 193: /* Set the event and dispatch. */
! 194: client_update_event();
! 195: event_dispatch();
! 196:
! 197: /* Print the exit message, if any, and exit. */
! 198: if (client_attached && client_exitmsg != NULL && !login_shell)
! 199: printf("[%s]\n", client_exitmsg);
! 200: return (client_exitval);
1.1 nicm 201: }
202:
1.46 ! nicm 203: /* Send identify message to server with the file descriptors. */
1.11 nicm 204: void
1.26 nicm 205: client_send_identify(int flags)
206: {
207: struct msg_identify_data data;
208: char *term;
209: int fd;
210:
211: data.flags = flags;
212:
213: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
214: *data.cwd = '\0';
1.35 nicm 215:
1.26 nicm 216: term = getenv("TERM");
217: if (term == NULL ||
218: strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
219: *data.term = '\0';
220:
221: if ((fd = dup(STDIN_FILENO)) == -1)
222: fatal("dup failed");
223: imsg_compose(&client_ibuf,
224: MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
1.42 nicm 225:
226: if ((fd = dup(STDOUT_FILENO)) == -1)
227: fatal("dup failed");
1.46 ! nicm 228: imsg_compose(&client_ibuf,
! 229: MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0);
1.42 nicm 230:
231: if ((fd = dup(STDERR_FILENO)) == -1)
232: fatal("dup failed");
1.46 ! nicm 233: imsg_compose(&client_ibuf,
! 234: MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0);
1.26 nicm 235: }
236:
1.46 ! nicm 237: /* Forward entire environment to server. */
1.26 nicm 238: void
1.25 nicm 239: client_send_environ(void)
1.11 nicm 240: {
1.26 nicm 241: struct msg_environ_data data;
1.11 nicm 242: char **var;
243:
1.35 nicm 244: for (var = environ; *var != NULL; var++) {
1.11 nicm 245: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
246: continue;
1.25 nicm 247: client_write_server(MSG_ENVIRON, &data, sizeof data);
1.11 nicm 248: }
249: }
250:
1.46 ! nicm 251: /* Write a message to the server without a file descriptor. */
1.25 nicm 252: void
253: client_write_server(enum msgtype type, void *buf, size_t len)
254: {
1.35 nicm 255: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
1.25 nicm 256: }
257:
1.46 ! nicm 258: /* Update client event based on whether it needs to read or read and write. */
1.31 nicm 259: void
260: client_update_event(void)
261: {
262: short events;
263:
264: event_del(&client_event);
265: events = EV_READ;
266: if (client_ibuf.w.queued > 0)
267: events |= EV_WRITE;
1.46 ! nicm 268: event_set(
! 269: &client_event, client_ibuf.fd, events, client_callback, shell_cmd);
1.31 nicm 270: event_add(&client_event, NULL);
271: }
272:
1.46 ! nicm 273: /* Callback to handle signals in the client. */
1.34 nicm 274: /* ARGSUSED */
1.30 nicm 275: void
1.31 nicm 276: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 277: {
1.46 ! nicm 278: struct sigaction sigact;
! 279: int status;
1.30 nicm 280:
1.46 ! nicm 281: if (!client_attached) {
! 282: switch (sig) {
! 283: case SIGCHLD:
! 284: waitpid(WAIT_ANY, &status, WNOHANG);
! 285: break;
! 286: case SIGTERM:
! 287: event_loopexit(NULL);
! 288: break;
! 289: }
! 290: } else {
! 291: switch (sig) {
! 292: case SIGHUP:
! 293: client_exitmsg = "lost tty";
! 294: client_exitval = 1;
! 295: client_write_server(MSG_EXITING, NULL, 0);
! 296: break;
! 297: case SIGTERM:
! 298: client_exitmsg = "terminated";
! 299: client_exitval = 1;
! 300: client_write_server(MSG_EXITING, NULL, 0);
! 301: break;
! 302: case SIGWINCH:
! 303: client_write_server(MSG_RESIZE, NULL, 0);
! 304: break;
! 305: case SIGCONT:
! 306: memset(&sigact, 0, sizeof sigact);
! 307: sigemptyset(&sigact.sa_mask);
! 308: sigact.sa_flags = SA_RESTART;
! 309: sigact.sa_handler = SIG_IGN;
! 310: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
! 311: fatal("sigaction failed");
! 312: client_write_server(MSG_WAKEUP, NULL, 0);
! 313: break;
! 314: }
1.30 nicm 315: }
316:
1.31 nicm 317: client_update_event();
1.30 nicm 318: }
319:
1.46 ! nicm 320: /* Callback for client imsg read events. */
1.34 nicm 321: /* ARGSUSED */
1.30 nicm 322: void
1.46 ! nicm 323: client_callback(unused int fd, short events, void *data)
1.30 nicm 324: {
1.33 nicm 325: ssize_t n;
1.46 ! nicm 326: int retval;
1.30 nicm 327:
328: if (events & EV_READ) {
329: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
330: goto lost_server;
1.46 ! nicm 331: if (client_attached)
! 332: retval = client_dispatch_attached();
! 333: else
! 334: retval = client_dispatch_wait(data);
! 335: if (retval != 0) {
1.30 nicm 336: event_loopexit(NULL);
337: return;
1.35 nicm 338: }
1.30 nicm 339: }
1.35 nicm 340:
1.30 nicm 341: if (events & EV_WRITE) {
342: if (msgbuf_write(&client_ibuf.w) < 0)
343: goto lost_server;
344: }
345:
1.31 nicm 346: client_update_event();
1.30 nicm 347: return;
348:
349: lost_server:
350: client_exitmsg = "lost server";
1.32 nicm 351: client_exitval = 1;
1.30 nicm 352: event_loopexit(NULL);
353: }
354:
1.46 ! nicm 355: /* Dispatch imsgs when in wait state (before MSG_READY). */
! 356: int
! 357: client_dispatch_wait(void *data)
! 358: {
! 359: struct imsg imsg;
! 360: ssize_t n, datalen;
! 361: struct msg_shell_data shelldata;
! 362: struct msg_exit_data exitdata;
! 363: const char *shellcmd = data;
! 364:
! 365: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
! 366: fatalx("imsg_read failed");
! 367:
! 368: for (;;) {
! 369: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
! 370: fatalx("imsg_get failed");
! 371: if (n == 0)
! 372: return (0);
! 373: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
! 374:
! 375: switch (imsg.hdr.type) {
! 376: case MSG_EXIT:
! 377: case MSG_SHUTDOWN:
! 378: if (datalen != sizeof exitdata) {
! 379: if (datalen != 0)
! 380: fatalx("bad MSG_EXIT size");
! 381: } else {
! 382: memcpy(&exitdata, imsg.data, sizeof exitdata);
! 383: client_exitval = exitdata.retcode;
! 384: }
! 385: imsg_free(&imsg);
! 386: return (-1);
! 387: case MSG_READY:
! 388: if (datalen != 0)
! 389: fatalx("bad MSG_READY size");
! 390:
! 391: client_attached = 1;
! 392: break;
! 393: case MSG_VERSION:
! 394: if (datalen != 0)
! 395: fatalx("bad MSG_VERSION size");
! 396:
! 397: log_warnx("protocol version mismatch (client %u, "
! 398: "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
! 399: client_exitval = 1;
! 400:
! 401: imsg_free(&imsg);
! 402: return (-1);
! 403: case MSG_SHELL:
! 404: if (datalen != sizeof shelldata)
! 405: fatalx("bad MSG_SHELL size");
! 406: memcpy(&shelldata, imsg.data, sizeof shelldata);
! 407: shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
! 408:
! 409: clear_signals(0);
! 410:
! 411: shell_exec(shelldata.shell, shellcmd);
! 412: /* NOTREACHED */
! 413: default:
! 414: fatalx("unexpected message");
! 415: }
! 416:
! 417: imsg_free(&imsg);
! 418: }
! 419: }
! 420:
! 421: /* Dispatch imsgs in attached state (after MSG_READY). */
! 422: /* ARGSUSED */
1.9 nicm 423: int
1.46 ! nicm 424: client_dispatch_attached(void)
1.9 nicm 425: {
1.30 nicm 426: struct imsg imsg;
427: struct msg_lock_data lockdata;
428: struct sigaction sigact;
429: ssize_t n, datalen;
1.9 nicm 430:
431: for (;;) {
1.25 nicm 432: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 433: fatalx("imsg_get failed");
434: if (n == 0)
1.9 nicm 435: return (0);
1.12 nicm 436: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 437:
1.30 nicm 438: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 439: switch (imsg.hdr.type) {
1.9 nicm 440: case MSG_DETACH:
1.12 nicm 441: if (datalen != 0)
1.9 nicm 442: fatalx("bad MSG_DETACH size");
443:
1.25 nicm 444: client_write_server(MSG_EXITING, NULL, 0);
445: client_exitmsg = "detached";
1.9 nicm 446: break;
447: case MSG_EXIT:
1.43 nicm 448: if (datalen != 0 &&
449: datalen != sizeof (struct msg_exit_data))
1.9 nicm 450: fatalx("bad MSG_EXIT size");
1.12 nicm 451:
1.25 nicm 452: client_write_server(MSG_EXITING, NULL, 0);
453: client_exitmsg = "exited";
1.9 nicm 454: break;
455: case MSG_EXITED:
1.12 nicm 456: if (datalen != 0)
1.9 nicm 457: fatalx("bad MSG_EXITED size");
458:
1.12 nicm 459: imsg_free(&imsg);
1.9 nicm 460: return (-1);
461: case MSG_SHUTDOWN:
1.12 nicm 462: if (datalen != 0)
1.9 nicm 463: fatalx("bad MSG_SHUTDOWN size");
464:
1.25 nicm 465: client_write_server(MSG_EXITING, NULL, 0);
466: client_exitmsg = "server exited";
1.32 nicm 467: client_exitval = 1;
1.9 nicm 468: break;
469: case MSG_SUSPEND:
1.12 nicm 470: if (datalen != 0)
1.9 nicm 471: fatalx("bad MSG_SUSPEND size");
472:
1.30 nicm 473: memset(&sigact, 0, sizeof sigact);
474: sigemptyset(&sigact.sa_mask);
475: sigact.sa_flags = SA_RESTART;
476: sigact.sa_handler = SIG_DFL;
477: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
478: fatal("sigaction failed");
479: kill(getpid(), SIGTSTP);
1.21 nicm 480: break;
481: case MSG_LOCK:
482: if (datalen != sizeof lockdata)
483: fatalx("bad MSG_LOCK size");
484: memcpy(&lockdata, imsg.data, sizeof lockdata);
1.35 nicm 485:
1.21 nicm 486: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
487: system(lockdata.cmd);
1.25 nicm 488: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 489: break;
490: default:
491: fatalx("unexpected message");
492: }
1.12 nicm 493:
494: imsg_free(&imsg);
1.9 nicm 495: }
1.1 nicm 496: }
![[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