Annotation of src/usr.bin/tmux/client.c, Revision 1.45
1.45 ! nicm 1: /* $OpenBSD: client.c,v 1.44 2010/08/23 17:36:32 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)
1.1 nicm 92: fatal("fcntl failed");
1.25 nicm 93: imsg_init(&client_ibuf, fd);
1.44 nicm 94: event_set(&client_event, fd, EV_READ, client_callback, NULL);
1.1 nicm 95:
1.11 nicm 96: if (cmdflags & CMD_SENDENVIRON)
1.25 nicm 97: client_send_environ();
1.42 nicm 98: client_send_identify(flags);
1.1 nicm 99:
1.25 nicm 100: return (&client_ibuf);
1.1 nicm 101:
102: start_failed:
103: log_warnx("server failed to start");
1.25 nicm 104: return (NULL);
1.1 nicm 105:
106: not_found:
107: log_warn("server not found");
1.25 nicm 108: return (NULL);
1.1 nicm 109: }
110:
1.11 nicm 111: void
1.26 nicm 112: client_send_identify(int flags)
113: {
114: struct msg_identify_data data;
115: char *term;
116: int fd;
117:
118: data.flags = flags;
119:
120: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
121: *data.cwd = '\0';
1.35 nicm 122:
1.26 nicm 123: term = getenv("TERM");
124: if (term == NULL ||
125: strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
126: *data.term = '\0';
127:
128: if ((fd = dup(STDIN_FILENO)) == -1)
129: fatal("dup failed");
130: imsg_compose(&client_ibuf,
131: MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
1.42 nicm 132:
133: if ((fd = dup(STDOUT_FILENO)) == -1)
134: fatal("dup failed");
135: imsg_compose(&client_ibuf, MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0);
136:
137: if ((fd = dup(STDERR_FILENO)) == -1)
138: fatal("dup failed");
139: imsg_compose(&client_ibuf, MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0);
1.26 nicm 140: }
141:
142: void
1.25 nicm 143: client_send_environ(void)
1.11 nicm 144: {
1.26 nicm 145: struct msg_environ_data data;
1.11 nicm 146: char **var;
147:
1.35 nicm 148: for (var = environ; *var != NULL; var++) {
1.11 nicm 149: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
150: continue;
1.25 nicm 151: client_write_server(MSG_ENVIRON, &data, sizeof data);
1.11 nicm 152: }
153: }
154:
1.25 nicm 155: void
156: client_write_server(enum msgtype type, void *buf, size_t len)
157: {
1.35 nicm 158: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
1.25 nicm 159: }
160:
1.31 nicm 161: void
162: client_update_event(void)
163: {
164: short events;
165:
166: event_del(&client_event);
167: events = EV_READ;
168: if (client_ibuf.w.queued > 0)
169: events |= EV_WRITE;
170: event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
171: event_add(&client_event, NULL);
172: }
173:
1.25 nicm 174: __dead void
175: client_main(void)
1.1 nicm 176: {
1.30 nicm 177: logfile("client");
178:
179: /* Note: event_init() has already been called. */
180:
1.35 nicm 181: /* Set up signals. */
1.38 nicm 182: set_signals(client_signal);
1.41 nicm 183:
184: /*
185: * Send a resize message immediately in case the terminal size has
186: * changed between the identify message to the server and the MSG_READY
187: * telling us to move into the client code.
188: */
189: client_write_server(MSG_RESIZE, NULL, 0);
1.1 nicm 190:
1.17 nicm 191: /*
192: * imsg_read in the first client poll loop (before the terminal has
1.30 nicm 193: * been initialised) may have read messages into the buffer after the
194: * MSG_READY switched to here. Process anything outstanding now to
195: * avoid hanging waiting for messages that have already arrived.
1.17 nicm 196: */
1.25 nicm 197: if (client_dispatch() != 0)
1.17 nicm 198: goto out;
199:
1.31 nicm 200: /* Set the event and dispatch. */
1.32 nicm 201: client_update_event();
1.30 nicm 202: event_dispatch();
1.17 nicm 203:
204: out:
1.25 nicm 205: /* Print the exit message, if any, and exit. */
1.32 nicm 206: if (client_exitmsg != NULL && !login_shell)
207: printf("[%s]\n", client_exitmsg);
208: exit(client_exitval);
1.9 nicm 209: }
210:
1.34 nicm 211: /* ARGSUSED */
1.30 nicm 212: void
1.31 nicm 213: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 214: {
215: struct sigaction sigact;
216:
217: switch (sig) {
1.39 jsing 218: case SIGHUP:
219: client_exitmsg = "lost tty";
220: client_exitval = 1;
221: client_write_server(MSG_EXITING, NULL, 0);
222: break;
1.30 nicm 223: case SIGTERM:
224: client_exitmsg = "terminated";
1.32 nicm 225: client_exitval = 1;
1.30 nicm 226: client_write_server(MSG_EXITING, NULL, 0);
227: break;
228: case SIGWINCH:
229: client_write_server(MSG_RESIZE, NULL, 0);
230: break;
231: case SIGCONT:
232: memset(&sigact, 0, sizeof sigact);
233: sigemptyset(&sigact.sa_mask);
234: sigact.sa_flags = SA_RESTART;
235: sigact.sa_handler = SIG_IGN;
236: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
237: fatal("sigaction failed");
238: client_write_server(MSG_WAKEUP, NULL, 0);
239: break;
240: }
241:
1.31 nicm 242: client_update_event();
1.30 nicm 243: }
244:
1.34 nicm 245: /* ARGSUSED */
1.30 nicm 246: void
247: client_callback(unused int fd, short events, unused void *data)
248: {
1.33 nicm 249: ssize_t n;
1.30 nicm 250:
251: if (events & EV_READ) {
252: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
253: goto lost_server;
254: if (client_dispatch() != 0) {
255: event_loopexit(NULL);
256: return;
1.35 nicm 257: }
1.30 nicm 258: }
1.35 nicm 259:
1.30 nicm 260: if (events & EV_WRITE) {
261: if (msgbuf_write(&client_ibuf.w) < 0)
262: goto lost_server;
263: }
264:
1.31 nicm 265: client_update_event();
1.30 nicm 266: return;
267:
268: lost_server:
269: client_exitmsg = "lost server";
1.32 nicm 270: client_exitval = 1;
1.30 nicm 271: event_loopexit(NULL);
272: }
273:
1.9 nicm 274: int
1.25 nicm 275: client_dispatch(void)
1.9 nicm 276: {
1.30 nicm 277: struct imsg imsg;
278: struct msg_lock_data lockdata;
279: struct sigaction sigact;
280: ssize_t n, datalen;
1.9 nicm 281:
282: for (;;) {
1.25 nicm 283: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 284: fatalx("imsg_get failed");
285: if (n == 0)
1.9 nicm 286: return (0);
1.12 nicm 287: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 288:
1.30 nicm 289: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 290: switch (imsg.hdr.type) {
1.9 nicm 291: case MSG_DETACH:
1.12 nicm 292: if (datalen != 0)
1.9 nicm 293: fatalx("bad MSG_DETACH size");
294:
1.25 nicm 295: client_write_server(MSG_EXITING, NULL, 0);
296: client_exitmsg = "detached";
1.9 nicm 297: break;
298: case MSG_EXIT:
1.43 nicm 299: if (datalen != 0 &&
300: datalen != sizeof (struct msg_exit_data))
1.9 nicm 301: fatalx("bad MSG_EXIT size");
1.12 nicm 302:
1.25 nicm 303: client_write_server(MSG_EXITING, NULL, 0);
304: client_exitmsg = "exited";
1.9 nicm 305: break;
306: case MSG_EXITED:
1.12 nicm 307: if (datalen != 0)
1.9 nicm 308: fatalx("bad MSG_EXITED size");
309:
1.12 nicm 310: imsg_free(&imsg);
1.9 nicm 311: return (-1);
312: case MSG_SHUTDOWN:
1.12 nicm 313: if (datalen != 0)
1.9 nicm 314: fatalx("bad MSG_SHUTDOWN size");
315:
1.25 nicm 316: client_write_server(MSG_EXITING, NULL, 0);
317: client_exitmsg = "server exited";
1.32 nicm 318: client_exitval = 1;
1.9 nicm 319: break;
320: case MSG_SUSPEND:
1.12 nicm 321: if (datalen != 0)
1.9 nicm 322: fatalx("bad MSG_SUSPEND size");
323:
1.30 nicm 324: memset(&sigact, 0, sizeof sigact);
325: sigemptyset(&sigact.sa_mask);
326: sigact.sa_flags = SA_RESTART;
327: sigact.sa_handler = SIG_DFL;
328: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
329: fatal("sigaction failed");
330: kill(getpid(), SIGTSTP);
1.21 nicm 331: break;
332: case MSG_LOCK:
333: if (datalen != sizeof lockdata)
334: fatalx("bad MSG_LOCK size");
335: memcpy(&lockdata, imsg.data, sizeof lockdata);
1.35 nicm 336:
1.21 nicm 337: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
338: system(lockdata.cmd);
1.25 nicm 339: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 340: break;
341: default:
342: fatalx("unexpected message");
343: }
1.12 nicm 344:
345: imsg_free(&imsg);
1.9 nicm 346: }
1.1 nicm 347: }
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