Annotation of src/usr.bin/tmux/client.c, Revision 1.40
1.40 ! nicm 1: /* $OpenBSD: client.c,v 1.39 2010/05/12 15:05:39 jsing 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();
1.26 nicm 99: if (isatty(STDIN_FILENO))
100: client_send_identify(flags);
1.1 nicm 101:
1.25 nicm 102: return (&client_ibuf);
1.1 nicm 103:
104: start_failed:
105: log_warnx("server failed to start");
1.25 nicm 106: return (NULL);
1.1 nicm 107:
108: not_found:
109: log_warn("server not found");
1.25 nicm 110: return (NULL);
1.1 nicm 111: }
112:
1.11 nicm 113: void
1.26 nicm 114: client_send_identify(int flags)
115: {
116: struct msg_identify_data data;
117: char *term;
118: int fd;
119:
120: data.flags = flags;
121:
122: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
123: *data.cwd = '\0';
1.35 nicm 124:
1.26 nicm 125: term = getenv("TERM");
126: if (term == NULL ||
127: strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
128: *data.term = '\0';
129:
130: if ((fd = dup(STDIN_FILENO)) == -1)
131: fatal("dup failed");
132: imsg_compose(&client_ibuf,
133: MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
134: }
135:
136: void
1.25 nicm 137: client_send_environ(void)
1.11 nicm 138: {
1.26 nicm 139: struct msg_environ_data data;
1.11 nicm 140: char **var;
141:
1.35 nicm 142: for (var = environ; *var != NULL; var++) {
1.11 nicm 143: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
144: continue;
1.25 nicm 145: client_write_server(MSG_ENVIRON, &data, sizeof data);
1.11 nicm 146: }
147: }
148:
1.25 nicm 149: void
150: client_write_server(enum msgtype type, void *buf, size_t len)
151: {
1.35 nicm 152: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
1.25 nicm 153: }
154:
1.31 nicm 155: void
156: client_update_event(void)
157: {
158: short events;
159:
160: event_del(&client_event);
161: events = EV_READ;
162: if (client_ibuf.w.queued > 0)
163: events |= EV_WRITE;
164: event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
165: event_add(&client_event, NULL);
166: }
167:
1.25 nicm 168: __dead void
169: client_main(void)
1.1 nicm 170: {
1.30 nicm 171: logfile("client");
172:
173: /* Note: event_init() has already been called. */
174:
1.35 nicm 175: /* Set up signals. */
1.38 nicm 176: set_signals(client_signal);
1.1 nicm 177:
1.17 nicm 178: /*
179: * imsg_read in the first client poll loop (before the terminal has
1.30 nicm 180: * been initialised) may have read messages into the buffer after the
181: * MSG_READY switched to here. Process anything outstanding now to
182: * avoid hanging waiting for messages that have already arrived.
1.17 nicm 183: */
1.25 nicm 184: if (client_dispatch() != 0)
1.17 nicm 185: goto out;
186:
1.31 nicm 187: /* Set the event and dispatch. */
1.32 nicm 188: client_update_event();
1.30 nicm 189: event_dispatch();
1.17 nicm 190:
191: out:
1.25 nicm 192: /* Print the exit message, if any, and exit. */
1.32 nicm 193: if (client_exitmsg != NULL && !login_shell)
194: printf("[%s]\n", client_exitmsg);
195: exit(client_exitval);
1.9 nicm 196: }
197:
1.34 nicm 198: /* ARGSUSED */
1.30 nicm 199: void
1.31 nicm 200: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 201: {
202: struct sigaction sigact;
203:
204: switch (sig) {
1.39 jsing 205: case SIGHUP:
206: client_exitmsg = "lost tty";
207: client_exitval = 1;
208: client_write_server(MSG_EXITING, NULL, 0);
209: break;
1.30 nicm 210: case SIGTERM:
211: client_exitmsg = "terminated";
1.32 nicm 212: client_exitval = 1;
1.30 nicm 213: client_write_server(MSG_EXITING, NULL, 0);
214: break;
215: case SIGWINCH:
216: client_write_server(MSG_RESIZE, NULL, 0);
217: break;
218: case SIGCONT:
219: memset(&sigact, 0, sizeof sigact);
220: sigemptyset(&sigact.sa_mask);
221: sigact.sa_flags = SA_RESTART;
222: sigact.sa_handler = SIG_IGN;
223: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
224: fatal("sigaction failed");
225: client_write_server(MSG_WAKEUP, NULL, 0);
226: break;
227: }
228:
1.31 nicm 229: client_update_event();
1.30 nicm 230: }
231:
1.34 nicm 232: /* ARGSUSED */
1.30 nicm 233: void
234: client_callback(unused int fd, short events, unused void *data)
235: {
1.33 nicm 236: ssize_t n;
1.30 nicm 237:
238: if (events & EV_READ) {
239: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
240: goto lost_server;
241: if (client_dispatch() != 0) {
242: event_loopexit(NULL);
243: return;
1.35 nicm 244: }
1.30 nicm 245: }
1.35 nicm 246:
1.30 nicm 247: if (events & EV_WRITE) {
248: if (msgbuf_write(&client_ibuf.w) < 0)
249: goto lost_server;
250: }
251:
1.31 nicm 252: client_update_event();
1.30 nicm 253: return;
254:
255: lost_server:
256: client_exitmsg = "lost server";
1.32 nicm 257: client_exitval = 1;
1.30 nicm 258: event_loopexit(NULL);
259: }
260:
1.9 nicm 261: int
1.25 nicm 262: client_dispatch(void)
1.9 nicm 263: {
1.30 nicm 264: struct imsg imsg;
265: struct msg_lock_data lockdata;
266: struct sigaction sigact;
267: ssize_t n, datalen;
1.9 nicm 268:
269: for (;;) {
1.25 nicm 270: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 271: fatalx("imsg_get failed");
272: if (n == 0)
1.9 nicm 273: return (0);
1.12 nicm 274: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 275:
1.30 nicm 276: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 277: switch (imsg.hdr.type) {
1.9 nicm 278: case MSG_DETACH:
1.12 nicm 279: if (datalen != 0)
1.9 nicm 280: fatalx("bad MSG_DETACH size");
281:
1.25 nicm 282: client_write_server(MSG_EXITING, NULL, 0);
283: client_exitmsg = "detached";
1.9 nicm 284: break;
285: case MSG_EXIT:
1.12 nicm 286: if (datalen != 0)
1.9 nicm 287: fatalx("bad MSG_EXIT size");
1.12 nicm 288:
1.25 nicm 289: client_write_server(MSG_EXITING, NULL, 0);
290: client_exitmsg = "exited";
1.9 nicm 291: break;
292: case MSG_EXITED:
1.12 nicm 293: if (datalen != 0)
1.9 nicm 294: fatalx("bad MSG_EXITED size");
295:
1.12 nicm 296: imsg_free(&imsg);
1.9 nicm 297: return (-1);
298: case MSG_SHUTDOWN:
1.12 nicm 299: if (datalen != 0)
1.9 nicm 300: fatalx("bad MSG_SHUTDOWN size");
301:
1.25 nicm 302: client_write_server(MSG_EXITING, NULL, 0);
303: client_exitmsg = "server exited";
1.32 nicm 304: client_exitval = 1;
1.9 nicm 305: break;
306: case MSG_SUSPEND:
1.12 nicm 307: if (datalen != 0)
1.9 nicm 308: fatalx("bad MSG_SUSPEND size");
309:
1.30 nicm 310: memset(&sigact, 0, sizeof sigact);
311: sigemptyset(&sigact.sa_mask);
312: sigact.sa_flags = SA_RESTART;
313: sigact.sa_handler = SIG_DFL;
314: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
315: fatal("sigaction failed");
316: kill(getpid(), SIGTSTP);
1.21 nicm 317: break;
318: case MSG_LOCK:
319: if (datalen != sizeof lockdata)
320: fatalx("bad MSG_LOCK size");
321: memcpy(&lockdata, imsg.data, sizeof lockdata);
1.35 nicm 322:
1.21 nicm 323: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
324: system(lockdata.cmd);
1.25 nicm 325: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 326: break;
327: default:
328: fatalx("unexpected message");
329: }
1.12 nicm 330:
331: imsg_free(&imsg);
1.9 nicm 332: }
1.1 nicm 333: }
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