Annotation of src/usr.bin/tmux/client.c, Revision 1.43
1.43 ! nicm 1: /* $OpenBSD: client.c,v 1.42 2010/06/28 22:10:42 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 <syslog.h>
32: #include <unistd.h>
33:
34: #include "tmux.h"
35:
1.25 nicm 36: struct imsgbuf client_ibuf;
1.30 nicm 37: struct event client_event;
1.25 nicm 38: const char *client_exitmsg;
1.32 nicm 39: int client_exitval;
1.1 nicm 40:
1.30 nicm 41: void client_send_identify(int);
42: void client_send_environ(void);
43: void client_write_server(enum msgtype, void *, size_t);
1.31 nicm 44: void client_update_event(void);
1.30 nicm 45: void client_signal(int, short, void *);
46: void client_callback(int, short, void *);
47: int client_dispatch(void);
1.25 nicm 48:
49: struct imsgbuf *
50: client_init(char *path, int cmdflags, int flags)
1.1 nicm 51: {
1.26 nicm 52: struct sockaddr_un sa;
53: size_t size;
54: int fd, mode;
55: char rpathbuf[MAXPATHLEN];
1.2 nicm 56:
57: if (realpath(path, rpathbuf) == NULL)
58: strlcpy(rpathbuf, path, sizeof rpathbuf);
59: setproctitle("client (%s)", rpathbuf);
1.1 nicm 60:
61: memset(&sa, 0, sizeof sa);
62: sa.sun_family = AF_UNIX;
63: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
64: if (size >= sizeof sa.sun_path) {
65: errno = ENAMETOOLONG;
66: goto not_found;
67: }
68:
1.10 nicm 69: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 70: fatal("socket failed");
1.1 nicm 71:
1.10 nicm 72: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.28 nicm 73: if (!(cmdflags & CMD_STARTSERVER))
74: goto not_found;
75: switch (errno) {
76: case ECONNREFUSED:
77: if (unlink(path) != 0)
1.1 nicm 78: goto not_found;
1.28 nicm 79: /* FALLTHROUGH */
80: case ENOENT:
1.10 nicm 81: if ((fd = server_start(path)) == -1)
1.1 nicm 82: goto start_failed;
83: goto server_started;
84: }
85: goto not_found;
86: }
87:
88: server_started:
1.10 nicm 89: if ((mode = fcntl(fd, F_GETFL)) == -1)
1.1 nicm 90: fatal("fcntl failed");
1.10 nicm 91: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
1.22 nicm 92: fatal("fcntl failed");
93: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
1.1 nicm 94: fatal("fcntl failed");
1.25 nicm 95: imsg_init(&client_ibuf, fd);
1.1 nicm 96:
1.11 nicm 97: if (cmdflags & CMD_SENDENVIRON)
1.25 nicm 98: client_send_environ();
1.42 nicm 99: client_send_identify(flags);
1.1 nicm 100:
1.25 nicm 101: return (&client_ibuf);
1.1 nicm 102:
103: start_failed:
104: log_warnx("server failed to start");
1.25 nicm 105: return (NULL);
1.1 nicm 106:
107: not_found:
108: log_warn("server not found");
1.25 nicm 109: return (NULL);
1.1 nicm 110: }
111:
1.11 nicm 112: void
1.26 nicm 113: client_send_identify(int flags)
114: {
115: struct msg_identify_data data;
116: char *term;
117: int fd;
118:
119: data.flags = flags;
120:
121: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
122: *data.cwd = '\0';
1.35 nicm 123:
1.26 nicm 124: term = getenv("TERM");
125: if (term == NULL ||
126: strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
127: *data.term = '\0';
128:
129: if ((fd = dup(STDIN_FILENO)) == -1)
130: fatal("dup failed");
131: imsg_compose(&client_ibuf,
132: MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
1.42 nicm 133:
134: if ((fd = dup(STDOUT_FILENO)) == -1)
135: fatal("dup failed");
136: imsg_compose(&client_ibuf, MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0);
137:
138: if ((fd = dup(STDERR_FILENO)) == -1)
139: fatal("dup failed");
140: imsg_compose(&client_ibuf, MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0);
1.26 nicm 141: }
142:
143: void
1.25 nicm 144: client_send_environ(void)
1.11 nicm 145: {
1.26 nicm 146: struct msg_environ_data data;
1.11 nicm 147: char **var;
148:
1.35 nicm 149: for (var = environ; *var != NULL; var++) {
1.11 nicm 150: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
151: continue;
1.25 nicm 152: client_write_server(MSG_ENVIRON, &data, sizeof data);
1.11 nicm 153: }
154: }
155:
1.25 nicm 156: void
157: client_write_server(enum msgtype type, void *buf, size_t len)
158: {
1.35 nicm 159: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
1.25 nicm 160: }
161:
1.31 nicm 162: void
163: client_update_event(void)
164: {
165: short events;
166:
167: event_del(&client_event);
168: events = EV_READ;
169: if (client_ibuf.w.queued > 0)
170: events |= EV_WRITE;
171: event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
172: event_add(&client_event, NULL);
173: }
174:
1.25 nicm 175: __dead void
176: client_main(void)
1.1 nicm 177: {
1.30 nicm 178: logfile("client");
179:
180: /* Note: event_init() has already been called. */
181:
1.35 nicm 182: /* Set up signals. */
1.38 nicm 183: set_signals(client_signal);
1.41 nicm 184:
185: /*
186: * Send a resize message immediately in case the terminal size has
187: * changed between the identify message to the server and the MSG_READY
188: * telling us to move into the client code.
189: */
190: client_write_server(MSG_RESIZE, NULL, 0);
1.1 nicm 191:
1.17 nicm 192: /*
193: * imsg_read in the first client poll loop (before the terminal has
1.30 nicm 194: * been initialised) may have read messages into the buffer after the
195: * MSG_READY switched to here. Process anything outstanding now to
196: * avoid hanging waiting for messages that have already arrived.
1.17 nicm 197: */
1.25 nicm 198: if (client_dispatch() != 0)
1.17 nicm 199: goto out;
200:
1.31 nicm 201: /* Set the event and dispatch. */
1.32 nicm 202: client_update_event();
1.30 nicm 203: event_dispatch();
1.17 nicm 204:
205: out:
1.25 nicm 206: /* Print the exit message, if any, and exit. */
1.32 nicm 207: if (client_exitmsg != NULL && !login_shell)
208: printf("[%s]\n", client_exitmsg);
209: exit(client_exitval);
1.9 nicm 210: }
211:
1.34 nicm 212: /* ARGSUSED */
1.30 nicm 213: void
1.31 nicm 214: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 215: {
216: struct sigaction sigact;
217:
218: switch (sig) {
1.39 jsing 219: case SIGHUP:
220: client_exitmsg = "lost tty";
221: client_exitval = 1;
222: client_write_server(MSG_EXITING, NULL, 0);
223: break;
1.30 nicm 224: case SIGTERM:
225: client_exitmsg = "terminated";
1.32 nicm 226: client_exitval = 1;
1.30 nicm 227: client_write_server(MSG_EXITING, NULL, 0);
228: break;
229: case SIGWINCH:
230: client_write_server(MSG_RESIZE, NULL, 0);
231: break;
232: case SIGCONT:
233: memset(&sigact, 0, sizeof sigact);
234: sigemptyset(&sigact.sa_mask);
235: sigact.sa_flags = SA_RESTART;
236: sigact.sa_handler = SIG_IGN;
237: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
238: fatal("sigaction failed");
239: client_write_server(MSG_WAKEUP, NULL, 0);
240: break;
241: }
242:
1.31 nicm 243: client_update_event();
1.30 nicm 244: }
245:
1.34 nicm 246: /* ARGSUSED */
1.30 nicm 247: void
248: client_callback(unused int fd, short events, unused void *data)
249: {
1.33 nicm 250: ssize_t n;
1.30 nicm 251:
252: if (events & EV_READ) {
253: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
254: goto lost_server;
255: if (client_dispatch() != 0) {
256: event_loopexit(NULL);
257: return;
1.35 nicm 258: }
1.30 nicm 259: }
1.35 nicm 260:
1.30 nicm 261: if (events & EV_WRITE) {
262: if (msgbuf_write(&client_ibuf.w) < 0)
263: goto lost_server;
264: }
265:
1.31 nicm 266: client_update_event();
1.30 nicm 267: return;
268:
269: lost_server:
270: client_exitmsg = "lost server";
1.32 nicm 271: client_exitval = 1;
1.30 nicm 272: event_loopexit(NULL);
273: }
274:
1.9 nicm 275: int
1.25 nicm 276: client_dispatch(void)
1.9 nicm 277: {
1.30 nicm 278: struct imsg imsg;
279: struct msg_lock_data lockdata;
280: struct sigaction sigact;
281: ssize_t n, datalen;
1.9 nicm 282:
283: for (;;) {
1.25 nicm 284: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 285: fatalx("imsg_get failed");
286: if (n == 0)
1.9 nicm 287: return (0);
1.12 nicm 288: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 289:
1.30 nicm 290: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 291: switch (imsg.hdr.type) {
1.9 nicm 292: case MSG_DETACH:
1.12 nicm 293: if (datalen != 0)
1.9 nicm 294: fatalx("bad MSG_DETACH size");
295:
1.25 nicm 296: client_write_server(MSG_EXITING, NULL, 0);
297: client_exitmsg = "detached";
1.9 nicm 298: break;
299: case MSG_EXIT:
1.43 ! nicm 300: if (datalen != 0 &&
! 301: datalen != sizeof (struct msg_exit_data))
1.9 nicm 302: fatalx("bad MSG_EXIT size");
1.12 nicm 303:
1.25 nicm 304: client_write_server(MSG_EXITING, NULL, 0);
305: client_exitmsg = "exited";
1.9 nicm 306: break;
307: case MSG_EXITED:
1.12 nicm 308: if (datalen != 0)
1.9 nicm 309: fatalx("bad MSG_EXITED size");
310:
1.12 nicm 311: imsg_free(&imsg);
1.9 nicm 312: return (-1);
313: case MSG_SHUTDOWN:
1.12 nicm 314: if (datalen != 0)
1.9 nicm 315: fatalx("bad MSG_SHUTDOWN size");
316:
1.25 nicm 317: client_write_server(MSG_EXITING, NULL, 0);
318: client_exitmsg = "server exited";
1.32 nicm 319: client_exitval = 1;
1.9 nicm 320: break;
321: case MSG_SUSPEND:
1.12 nicm 322: if (datalen != 0)
1.9 nicm 323: fatalx("bad MSG_SUSPEND size");
324:
1.30 nicm 325: memset(&sigact, 0, sizeof sigact);
326: sigemptyset(&sigact.sa_mask);
327: sigact.sa_flags = SA_RESTART;
328: sigact.sa_handler = SIG_DFL;
329: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
330: fatal("sigaction failed");
331: kill(getpid(), SIGTSTP);
1.21 nicm 332: break;
333: case MSG_LOCK:
334: if (datalen != sizeof lockdata)
335: fatalx("bad MSG_LOCK size");
336: memcpy(&lockdata, imsg.data, sizeof lockdata);
1.35 nicm 337:
1.21 nicm 338: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
339: system(lockdata.cmd);
1.25 nicm 340: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 341: break;
342: default:
343: fatalx("unexpected message");
344: }
1.12 nicm 345:
346: imsg_free(&imsg);
1.9 nicm 347: }
1.1 nicm 348: }
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