Annotation of src/usr.bin/tmux/client.c, Revision 1.79
1.79 ! nicm 1: /* $OpenBSD: client.c,v 1.78 2014/01/09 21:20:45 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>
1.51 nicm 20: #include <sys/file.h>
1.1 nicm 21: #include <sys/socket.h>
22: #include <sys/stat.h>
23: #include <sys/un.h>
24: #include <sys/wait.h>
25:
26: #include <errno.h>
1.30 nicm 27: #include <event.h>
1.1 nicm 28: #include <stdlib.h>
29: #include <string.h>
30: #include <unistd.h>
31:
32: #include "tmux.h"
33:
1.25 nicm 34: struct imsgbuf client_ibuf;
1.30 nicm 35: struct event client_event;
1.54 nicm 36: struct event client_stdin;
1.52 nicm 37: enum {
38: CLIENT_EXIT_NONE,
39: CLIENT_EXIT_DETACHED,
40: CLIENT_EXIT_DETACHED_HUP,
41: CLIENT_EXIT_LOST_TTY,
42: CLIENT_EXIT_TERMINATED,
43: CLIENT_EXIT_LOST_SERVER,
44: CLIENT_EXIT_EXITED,
45: CLIENT_EXIT_SERVER_EXITED,
46: } client_exitreason = CLIENT_EXIT_NONE;
1.32 nicm 47: int client_exitval;
1.48 nicm 48: enum msgtype client_exittype;
1.73 nicm 49: const char *client_exitsession;
1.46 nicm 50: int client_attached;
1.1 nicm 51:
1.49 nicm 52: int client_get_lock(char *);
1.46 nicm 53: int client_connect(char *, int);
1.30 nicm 54: void client_send_identify(int);
1.70 nicm 55: int client_write_one(enum msgtype, int, const void *, size_t);
56: int client_write_server(enum msgtype, const void *, size_t);
1.31 nicm 57: void client_update_event(void);
1.30 nicm 58: void client_signal(int, short, void *);
1.54 nicm 59: void client_stdin_callback(int, short, void *);
1.57 nicm 60: void client_write(int, const char *, size_t);
1.30 nicm 61: void client_callback(int, short, void *);
1.46 nicm 62: int client_dispatch_attached(void);
63: int client_dispatch_wait(void *);
1.53 nicm 64: const char *client_exit_message(void);
1.25 nicm 65:
1.49 nicm 66: /*
67: * Get server create lock. If already held then server start is happening in
68: * another client, so block until the lock is released and return -1 to
69: * retry. Ignore other errors - just continue and start the server without the
70: * lock.
71: */
72: int
73: client_get_lock(char *lockfile)
74: {
75: int lockfd;
76:
77: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1)
78: fatal("open failed");
79:
1.66 nicm 80: if (lockf(lockfd, F_TLOCK, 0) == -1 && errno == EAGAIN) {
81: while (lockf(lockfd, F_LOCK, 0) == -1 && errno == EINTR)
1.49 nicm 82: /* nothing */;
83: close(lockfd);
84: return (-1);
85: }
86:
87: return (lockfd);
88: }
89:
1.46 nicm 90: /* Connect client to server. */
91: int
92: client_connect(char *path, int start_server)
1.1 nicm 93: {
1.26 nicm 94: struct sockaddr_un sa;
95: size_t size;
1.49 nicm 96: int fd, lockfd;
97: char *lockfile;
1.1 nicm 98:
99: memset(&sa, 0, sizeof sa);
100: sa.sun_family = AF_UNIX;
101: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
102: if (size >= sizeof sa.sun_path) {
103: errno = ENAMETOOLONG;
1.46 nicm 104: return (-1);
1.1 nicm 105: }
106:
1.49 nicm 107: retry:
1.10 nicm 108: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 109: fatal("socket failed");
1.1 nicm 110:
1.10 nicm 111: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.49 nicm 112: if (errno != ECONNREFUSED && errno != ENOENT)
113: goto failed;
1.46 nicm 114: if (!start_server)
115: goto failed;
1.49 nicm 116: close(fd);
117:
118: xasprintf(&lockfile, "%s.lock", path);
1.78 nicm 119: if ((lockfd = client_get_lock(lockfile)) == -1) {
120: free(lockfile);
1.49 nicm 121: goto retry;
1.78 nicm 122: }
123: if (unlink(path) != 0 && errno != ENOENT) {
124: free(lockfile);
125: close(lockfd);
1.49 nicm 126: return (-1);
1.78 nicm 127: }
1.49 nicm 128: fd = server_start(lockfd, lockfile);
1.58 nicm 129: free(lockfile);
1.49 nicm 130: close(lockfd);
1.1 nicm 131: }
132:
1.47 nicm 133: setblocking(fd, 0);
1.46 nicm 134: return (fd);
135:
136: failed:
137: close(fd);
138: return (-1);
139: }
140:
1.52 nicm 141: /* Get exit string from reason number. */
142: const char *
143: client_exit_message(void)
144: {
1.73 nicm 145: static char msg[256];
146:
1.52 nicm 147: switch (client_exitreason) {
148: case CLIENT_EXIT_NONE:
149: break;
150: case CLIENT_EXIT_DETACHED:
1.73 nicm 151: if (client_exitsession != NULL) {
152: xsnprintf(msg, sizeof msg, "detached "
153: "(from session %s)", client_exitsession);
154: return (msg);
155: }
1.52 nicm 156: return ("detached");
157: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 158: if (client_exitsession != NULL) {
159: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
160: "(from session %s)", client_exitsession);
161: return (msg);
162: }
1.52 nicm 163: return ("detached and SIGHUP");
164: case CLIENT_EXIT_LOST_TTY:
165: return ("lost tty");
166: case CLIENT_EXIT_TERMINATED:
167: return ("terminated");
168: case CLIENT_EXIT_LOST_SERVER:
169: return ("lost server");
170: case CLIENT_EXIT_EXITED:
171: return ("exited");
172: case CLIENT_EXIT_SERVER_EXITED:
173: return ("server exited");
174: }
175: return ("unknown reason");
176: }
177:
1.46 nicm 178: /* Client main loop. */
179: int
180: client_main(int argc, char **argv, int flags)
181: {
182: struct cmd *cmd;
183: struct cmd_list *cmdlist;
1.70 nicm 184: struct msg_command_data *data;
185: int cmdflags, fd, i;
1.48 nicm 186: pid_t ppid;
1.46 nicm 187: enum msgtype msg;
188: char *cause;
1.56 nicm 189: struct termios tio, saved_tio;
1.70 nicm 190: size_t size;
1.46 nicm 191:
192: /* Set up the initial command. */
193: cmdflags = 0;
194: if (shell_cmd != NULL) {
195: msg = MSG_SHELL;
196: cmdflags = CMD_STARTSERVER;
197: } else if (argc == 0) {
198: msg = MSG_COMMAND;
1.67 nicm 199: cmdflags = CMD_STARTSERVER|CMD_CANTNEST;
1.46 nicm 200: } else {
201: msg = MSG_COMMAND;
202:
203: /*
204: * It sucks parsing the command string twice (in client and
205: * later in server) but it is necessary to get the start server
206: * flag.
207: */
1.62 nicm 208: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
209: if (cmdlist == NULL) {
1.59 nicm 210: fprintf(stderr, "%s\n", cause);
1.46 nicm 211: return (1);
212: }
213: cmdflags &= ~CMD_STARTSERVER;
214: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
215: if (cmd->entry->flags & CMD_STARTSERVER)
216: cmdflags |= CMD_STARTSERVER;
217: if (cmd->entry->flags & CMD_CANTNEST)
218: cmdflags |= CMD_CANTNEST;
219: }
220: cmd_list_free(cmdlist);
221: }
222:
223: /*
224: * Check if this could be a nested session, if the command can't nest:
225: * if the socket path matches $TMUX, this is probably the same server.
226: */
227: if (shell_cmd == NULL && environ_path != NULL &&
1.52 nicm 228: (cmdflags & CMD_CANTNEST) &&
229: strcmp(socket_path, environ_path) == 0) {
1.55 nicm 230: fprintf(stderr, "sessions should be nested with care, "
231: "unset $TMUX to force\n");
1.46 nicm 232: return (1);
233: }
234:
235: /* Initialise the client socket and start the server. */
236: fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
237: if (fd == -1) {
1.77 nicm 238: fprintf(stderr, "failed to connect to server: %s\n",
239: strerror(errno));
1.46 nicm 240: return (1);
241: }
242:
243: /* Set process title, log and signals now this is the client. */
244: setproctitle("client (%s)", socket_path);
245: logfile("client");
246:
247: /* Create imsg. */
1.25 nicm 248: imsg_init(&client_ibuf, fd);
1.46 nicm 249: event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
250:
1.54 nicm 251: /* Create stdin handler. */
252: setblocking(STDIN_FILENO, 0);
253: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
254: client_stdin_callback, NULL);
1.68 nicm 255: if (flags & CLIENT_CONTROLCONTROL) {
1.56 nicm 256: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
257: fprintf(stderr, "tcgetattr failed: %s\n",
258: strerror(errno));
259: return (1);
260: }
261: cfmakeraw(&tio);
262: tio.c_iflag = ICRNL|IXANY;
263: tio.c_oflag = OPOST|ONLCR;
264: tio.c_lflag = NOKERNINFO;
265: tio.c_cflag = CREAD|CS8|HUPCL;
266: tio.c_cc[VMIN] = 1;
267: tio.c_cc[VTIME] = 0;
268: cfsetispeed(&tio, cfgetispeed(&saved_tio));
269: cfsetospeed(&tio, cfgetospeed(&saved_tio));
270: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
271: }
1.54 nicm 272:
1.46 nicm 273: /* Establish signal handlers. */
274: set_signals(client_signal);
1.1 nicm 275:
1.71 nicm 276: /* Send identify messages. */
1.42 nicm 277: client_send_identify(flags);
1.1 nicm 278:
1.46 nicm 279: /* Send first command. */
280: if (msg == MSG_COMMAND) {
1.70 nicm 281: /* How big is the command? */
282: size = 0;
283: for (i = 0; i < argc; i++)
284: size += strlen(argv[i]) + 1;
285: data = xmalloc((sizeof *data) + size);
1.46 nicm 286:
287: /* Prepare command for server. */
1.70 nicm 288: data->argc = argc;
289: if (cmd_pack_argv(argc, argv, (char*)(data + 1), size) != 0) {
1.55 nicm 290: fprintf(stderr, "command too long\n");
1.70 nicm 291: free(data);
1.46 nicm 292: return (1);
293: }
1.70 nicm 294: size += sizeof *data;
1.46 nicm 295:
1.70 nicm 296: /* Send the command. */
297: if (client_write_server(msg, data, size) != 0) {
298: fprintf(stderr, "failed to send command\n");
299: free(data);
300: return (1);
301: }
302: free(data);
1.46 nicm 303: } else if (msg == MSG_SHELL)
304: client_write_server(msg, NULL, 0);
1.1 nicm 305:
1.46 nicm 306: /* Set the event and dispatch. */
307: client_update_event();
308: event_dispatch();
309:
310: /* Print the exit message, if any, and exit. */
1.48 nicm 311: if (client_attached) {
1.52 nicm 312: if (client_exitreason != CLIENT_EXIT_NONE && !login_shell)
313: printf("[%s]\n", client_exit_message());
1.48 nicm 314:
315: ppid = getppid();
316: if (client_exittype == MSG_DETACHKILL && ppid > 1)
317: kill(ppid, SIGHUP);
1.68 nicm 318: } else if (flags & CLIENT_CONTROLCONTROL) {
319: if (client_exitreason != CLIENT_EXIT_NONE)
320: printf("%%exit %s\n", client_exit_message());
321: else
322: printf("%%exit\n");
323: printf("\033\\");
1.56 nicm 324: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.63 nicm 325: }
1.54 nicm 326: setblocking(STDIN_FILENO, 1);
1.46 nicm 327: return (client_exitval);
1.1 nicm 328: }
329:
1.71 nicm 330: /* Send identify messages to server. */
1.11 nicm 331: void
1.26 nicm 332: client_send_identify(int flags)
333: {
1.71 nicm 334: const char *s;
335: char **ss;
336: int fd;
337:
338: client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
339:
340: if ((s = getenv("TERM")) == NULL)
341: s = "";
342: client_write_one(MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
343:
344: if ((s = ttyname(STDIN_FILENO)) == NULL)
345: s = "";
346: client_write_one(MSG_IDENTIFY_TTYNAME, -1, s, strlen(s) + 1);
347:
348: if ((fd = open(".", O_RDONLY)) == -1)
349: fd = open("/", O_RDONLY);
350: client_write_one(MSG_IDENTIFY_CWD, fd, NULL, 0);
1.26 nicm 351:
1.50 nicm 352: if ((fd = dup(STDIN_FILENO)) == -1)
353: fatal("dup failed");
1.71 nicm 354: client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.26 nicm 355:
1.71 nicm 356: for (ss = environ; *ss != NULL; ss++)
357: client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, strlen(*ss) + 1);
1.75 nicm 358:
1.71 nicm 359: client_write_one(MSG_IDENTIFY_DONE, -1, NULL, 0);
1.11 nicm 360:
1.71 nicm 361: client_update_event();
1.11 nicm 362: }
363:
1.70 nicm 364: /* Helper to send one message. */
365: int
366: client_write_one(enum msgtype type, int fd, const void *buf, size_t len)
367: {
368: int retval;
369:
370: retval = imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, fd,
371: (void*)buf, len);
372: if (retval != 1)
373: return (-1);
374: return (0);
375: }
376:
1.46 nicm 377: /* Write a message to the server without a file descriptor. */
1.70 nicm 378: int
379: client_write_server(enum msgtype type, const void *buf, size_t len)
1.25 nicm 380: {
1.70 nicm 381: int retval;
382:
383: retval = client_write_one(type, -1, buf, len);
384: if (retval == 0)
385: client_update_event();
386: return (retval);
1.25 nicm 387: }
388:
1.46 nicm 389: /* Update client event based on whether it needs to read or read and write. */
1.31 nicm 390: void
391: client_update_event(void)
392: {
393: short events;
394:
395: event_del(&client_event);
396: events = EV_READ;
397: if (client_ibuf.w.queued > 0)
398: events |= EV_WRITE;
1.46 nicm 399: event_set(
400: &client_event, client_ibuf.fd, events, client_callback, shell_cmd);
1.31 nicm 401: event_add(&client_event, NULL);
402: }
403:
1.46 nicm 404: /* Callback to handle signals in the client. */
1.30 nicm 405: void
1.31 nicm 406: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 407: {
1.46 nicm 408: struct sigaction sigact;
409: int status;
1.30 nicm 410:
1.46 nicm 411: if (!client_attached) {
412: switch (sig) {
413: case SIGCHLD:
414: waitpid(WAIT_ANY, &status, WNOHANG);
415: break;
416: case SIGTERM:
417: event_loopexit(NULL);
418: break;
419: }
420: } else {
421: switch (sig) {
422: case SIGHUP:
1.52 nicm 423: client_exitreason = CLIENT_EXIT_LOST_TTY;
1.46 nicm 424: client_exitval = 1;
425: client_write_server(MSG_EXITING, NULL, 0);
426: break;
427: case SIGTERM:
1.52 nicm 428: client_exitreason = CLIENT_EXIT_TERMINATED;
1.46 nicm 429: client_exitval = 1;
430: client_write_server(MSG_EXITING, NULL, 0);
431: break;
432: case SIGWINCH:
433: client_write_server(MSG_RESIZE, NULL, 0);
434: break;
435: case SIGCONT:
436: memset(&sigact, 0, sizeof sigact);
437: sigemptyset(&sigact.sa_mask);
438: sigact.sa_flags = SA_RESTART;
439: sigact.sa_handler = SIG_IGN;
440: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
441: fatal("sigaction failed");
442: client_write_server(MSG_WAKEUP, NULL, 0);
443: break;
444: }
1.30 nicm 445: }
446:
1.31 nicm 447: client_update_event();
1.30 nicm 448: }
449:
1.46 nicm 450: /* Callback for client imsg read events. */
1.30 nicm 451: void
1.46 nicm 452: client_callback(unused int fd, short events, void *data)
1.30 nicm 453: {
1.33 nicm 454: ssize_t n;
1.46 nicm 455: int retval;
1.30 nicm 456:
457: if (events & EV_READ) {
458: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
459: goto lost_server;
1.46 nicm 460: if (client_attached)
461: retval = client_dispatch_attached();
462: else
463: retval = client_dispatch_wait(data);
464: if (retval != 0) {
1.30 nicm 465: event_loopexit(NULL);
466: return;
1.35 nicm 467: }
1.30 nicm 468: }
1.35 nicm 469:
1.30 nicm 470: if (events & EV_WRITE) {
1.76 benno 471: if (msgbuf_write(&client_ibuf.w) < 0 && errno != EAGAIN)
1.30 nicm 472: goto lost_server;
473: }
474:
1.31 nicm 475: client_update_event();
1.30 nicm 476: return;
477:
478: lost_server:
1.52 nicm 479: client_exitreason = CLIENT_EXIT_LOST_SERVER;
1.32 nicm 480: client_exitval = 1;
1.30 nicm 481: event_loopexit(NULL);
482: }
483:
1.54 nicm 484: /* Callback for client stdin read events. */
485: void
486: client_stdin_callback(unused int fd, unused short events, unused void *data1)
487: {
488: struct msg_stdin_data data;
489:
490: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
491: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
492: return;
493:
494: client_write_server(MSG_STDIN, &data, sizeof data);
495: if (data.size <= 0)
496: event_del(&client_stdin);
497: client_update_event();
498: }
499:
1.57 nicm 500: /* Force write to file descriptor. */
501: void
502: client_write(int fd, const char *data, size_t size)
503: {
504: ssize_t used;
505:
506: while (size != 0) {
507: used = write(fd, data, size);
508: if (used == -1) {
509: if (errno == EINTR || errno == EAGAIN)
510: continue;
511: break;
512: }
513: data += used;
514: size -= used;
515: }
516: }
517:
1.46 nicm 518: /* Dispatch imsgs when in wait state (before MSG_READY). */
519: int
1.69 nicm 520: client_dispatch_wait(void *data0)
1.46 nicm 521: {
1.69 nicm 522: struct imsg imsg;
523: char *data;
524: ssize_t n, datalen;
525: struct msg_stdout_data stdoutdata;
526: struct msg_stderr_data stderrdata;
527: int retval;
1.46 nicm 528:
529: for (;;) {
530: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
531: fatalx("imsg_get failed");
532: if (n == 0)
533: return (0);
1.69 nicm 534:
535: data = imsg.data;
1.46 nicm 536: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
537:
1.54 nicm 538: log_debug("got %d from server", imsg.hdr.type);
1.46 nicm 539: switch (imsg.hdr.type) {
540: case MSG_EXIT:
541: case MSG_SHUTDOWN:
1.69 nicm 542: if (datalen != sizeof retval && datalen != 0)
543: fatalx("bad MSG_EXIT size");
544: if (datalen == sizeof retval) {
545: memcpy(&retval, data, sizeof retval);
546: client_exitval = retval;
1.46 nicm 547: }
548: imsg_free(&imsg);
549: return (-1);
550: case MSG_READY:
551: if (datalen != 0)
552: fatalx("bad MSG_READY size");
553:
1.54 nicm 554: event_del(&client_stdin);
1.46 nicm 555: client_attached = 1;
1.65 nicm 556: client_write_server(MSG_RESIZE, NULL, 0);
1.60 nicm 557: break;
558: case MSG_STDIN:
559: if (datalen != 0)
560: fatalx("bad MSG_STDIN size");
561:
562: event_add(&client_stdin, NULL);
1.46 nicm 563: break;
1.54 nicm 564: case MSG_STDOUT:
565: if (datalen != sizeof stdoutdata)
1.69 nicm 566: fatalx("bad MSG_STDOUT size");
567: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.54 nicm 568:
1.70 nicm 569: client_write(STDOUT_FILENO, stdoutdata.data,
570: stdoutdata.size);
1.54 nicm 571: break;
572: case MSG_STDERR:
573: if (datalen != sizeof stderrdata)
1.69 nicm 574: fatalx("bad MSG_STDERR size");
575: memcpy(&stderrdata, data, sizeof stderrdata);
1.54 nicm 576:
1.70 nicm 577: client_write(STDERR_FILENO, stderrdata.data,
578: stderrdata.size);
1.54 nicm 579: break;
1.46 nicm 580: case MSG_VERSION:
581: if (datalen != 0)
582: fatalx("bad MSG_VERSION size");
583:
1.54 nicm 584: fprintf(stderr, "protocol version mismatch "
585: "(client %u, server %u)\n", PROTOCOL_VERSION,
586: imsg.hdr.peerid);
1.46 nicm 587: client_exitval = 1;
588:
589: imsg_free(&imsg);
590: return (-1);
591: case MSG_SHELL:
1.72 nicm 592: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 593: fatalx("bad MSG_SHELL string");
1.46 nicm 594:
595: clear_signals(0);
1.69 nicm 596: shell_exec(data, data0);
1.46 nicm 597: /* NOTREACHED */
1.56 nicm 598: case MSG_DETACH:
1.73 nicm 599: case MSG_DETACHKILL:
1.56 nicm 600: client_write_server(MSG_EXITING, NULL, 0);
601: break;
602: case MSG_EXITED:
603: imsg_free(&imsg);
604: return (-1);
1.46 nicm 605: }
606:
607: imsg_free(&imsg);
608: }
609: }
610:
611: /* Dispatch imsgs in attached state (after MSG_READY). */
1.9 nicm 612: int
1.46 nicm 613: client_dispatch_attached(void)
1.9 nicm 614: {
1.69 nicm 615: struct imsg imsg;
616: struct sigaction sigact;
617: char *data;
618: ssize_t n, datalen;
1.9 nicm 619:
620: for (;;) {
1.25 nicm 621: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 622: fatalx("imsg_get failed");
623: if (n == 0)
1.9 nicm 624: return (0);
1.69 nicm 625:
626: data = imsg.data;
1.12 nicm 627: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 628:
1.55 nicm 629: log_debug("got %d from server", imsg.hdr.type);
1.12 nicm 630: switch (imsg.hdr.type) {
1.73 nicm 631: case MSG_DETACH:
1.48 nicm 632: case MSG_DETACHKILL:
1.73 nicm 633: if (datalen == 0 || data[datalen - 1] != '\0')
634: fatalx("bad MSG_DETACH string");
1.9 nicm 635:
1.73 nicm 636: client_exitsession = xstrdup(data);
1.48 nicm 637: client_exittype = imsg.hdr.type;
638: if (imsg.hdr.type == MSG_DETACHKILL)
1.52 nicm 639: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
1.48 nicm 640: else
1.52 nicm 641: client_exitreason = CLIENT_EXIT_DETACHED;
1.25 nicm 642: client_write_server(MSG_EXITING, NULL, 0);
1.9 nicm 643: break;
644: case MSG_EXIT:
1.69 nicm 645: if (datalen != 0 && datalen != sizeof (int))
1.9 nicm 646: fatalx("bad MSG_EXIT size");
1.12 nicm 647:
1.25 nicm 648: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 649: client_exitreason = CLIENT_EXIT_EXITED;
1.9 nicm 650: break;
651: case MSG_EXITED:
1.12 nicm 652: if (datalen != 0)
1.9 nicm 653: fatalx("bad MSG_EXITED size");
654:
1.12 nicm 655: imsg_free(&imsg);
1.9 nicm 656: return (-1);
657: case MSG_SHUTDOWN:
1.12 nicm 658: if (datalen != 0)
1.9 nicm 659: fatalx("bad MSG_SHUTDOWN size");
660:
1.25 nicm 661: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 662: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
1.32 nicm 663: client_exitval = 1;
1.9 nicm 664: break;
665: case MSG_SUSPEND:
1.12 nicm 666: if (datalen != 0)
1.9 nicm 667: fatalx("bad MSG_SUSPEND size");
668:
1.30 nicm 669: memset(&sigact, 0, sizeof sigact);
670: sigemptyset(&sigact.sa_mask);
671: sigact.sa_flags = SA_RESTART;
672: sigact.sa_handler = SIG_DFL;
673: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
674: fatal("sigaction failed");
675: kill(getpid(), SIGTSTP);
1.21 nicm 676: break;
677: case MSG_LOCK:
1.72 nicm 678: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 679: fatalx("bad MSG_LOCK string");
1.35 nicm 680:
1.69 nicm 681: system(data);
1.25 nicm 682: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 683: break;
684: }
1.12 nicm 685:
686: imsg_free(&imsg);
1.9 nicm 687: }
1.1 nicm 688: }
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