Annotation of src/usr.bin/tmux/client.c, Revision 1.34
1.34 ! nicm 1: /* $OpenBSD: client.c,v 1.33 2009/11/13 18:07:52 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/ioctl.h>
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 <fcntl.h>
29: #include <pwd.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <syslog.h>
33: #include <unistd.h>
34:
35: #include "tmux.h"
36:
1.25 nicm 37: struct imsgbuf client_ibuf;
1.30 nicm 38: struct event client_event;
1.25 nicm 39: const char *client_exitmsg;
1.32 nicm 40: int client_exitval;
1.1 nicm 41:
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 *);
48: int client_dispatch(void);
1.25 nicm 49:
50: struct imsgbuf *
51: client_init(char *path, int cmdflags, int flags)
1.1 nicm 52: {
1.26 nicm 53: struct sockaddr_un sa;
54: size_t size;
55: int fd, mode;
56: char rpathbuf[MAXPATHLEN];
1.2 nicm 57:
58: if (realpath(path, rpathbuf) == NULL)
59: strlcpy(rpathbuf, path, sizeof rpathbuf);
60: setproctitle("client (%s)", rpathbuf);
1.1 nicm 61:
62: memset(&sa, 0, sizeof sa);
63: sa.sun_family = AF_UNIX;
64: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
65: if (size >= sizeof sa.sun_path) {
66: errno = ENAMETOOLONG;
67: goto not_found;
68: }
69:
1.10 nicm 70: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 71: fatal("socket failed");
1.1 nicm 72:
1.10 nicm 73: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.28 nicm 74: if (!(cmdflags & CMD_STARTSERVER))
75: goto not_found;
76: switch (errno) {
77: case ECONNREFUSED:
78: if (unlink(path) != 0)
1.1 nicm 79: goto not_found;
1.28 nicm 80: /* FALLTHROUGH */
81: case ENOENT:
1.10 nicm 82: if ((fd = server_start(path)) == -1)
1.1 nicm 83: goto start_failed;
84: goto server_started;
85: }
86: goto not_found;
87: }
88:
89: server_started:
1.10 nicm 90: if ((mode = fcntl(fd, F_GETFL)) == -1)
1.1 nicm 91: fatal("fcntl failed");
1.10 nicm 92: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
1.22 nicm 93: fatal("fcntl failed");
94: if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
1.1 nicm 95: fatal("fcntl failed");
1.25 nicm 96: imsg_init(&client_ibuf, fd);
1.1 nicm 97:
1.11 nicm 98: if (cmdflags & CMD_SENDENVIRON)
1.25 nicm 99: client_send_environ();
1.26 nicm 100: if (isatty(STDIN_FILENO))
101: client_send_identify(flags);
1.1 nicm 102:
1.25 nicm 103: return (&client_ibuf);
1.1 nicm 104:
105: start_failed:
106: log_warnx("server failed to start");
1.25 nicm 107: return (NULL);
1.1 nicm 108:
109: not_found:
110: log_warn("server not found");
1.25 nicm 111: return (NULL);
1.1 nicm 112: }
113:
1.11 nicm 114: void
1.26 nicm 115: client_send_identify(int flags)
116: {
117: struct msg_identify_data data;
118: struct winsize ws;
119: char *term;
120: int fd;
121:
122: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
123: fatal("ioctl(TIOCGWINSZ)");
124: data.flags = flags;
125:
126: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
127: *data.cwd = '\0';
128:
129: term = getenv("TERM");
130: if (term == NULL ||
131: strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
132: *data.term = '\0';
133:
134: if ((fd = dup(STDIN_FILENO)) == -1)
135: fatal("dup failed");
136: imsg_compose(&client_ibuf,
137: MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
138: }
139:
140: void
1.25 nicm 141: client_send_environ(void)
1.11 nicm 142: {
1.26 nicm 143: struct msg_environ_data data;
1.11 nicm 144: char **var;
145:
146: for (var = environ; *var != NULL; var++) {
147: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
148: continue;
1.25 nicm 149: client_write_server(MSG_ENVIRON, &data, sizeof data);
1.11 nicm 150: }
151: }
152:
1.25 nicm 153: void
154: client_write_server(enum msgtype type, void *buf, size_t len)
155: {
156: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
157: }
158:
1.31 nicm 159: void
160: client_update_event(void)
161: {
162: short events;
163:
164: event_del(&client_event);
165: events = EV_READ;
166: if (client_ibuf.w.queued > 0)
167: events |= EV_WRITE;
168: event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
169: event_add(&client_event, NULL);
170: }
171:
1.25 nicm 172: __dead void
173: client_main(void)
1.1 nicm 174: {
1.30 nicm 175: struct event ev_sigcont, ev_sigterm, ev_sigwinch;
176: struct sigaction sigact;
1.1 nicm 177:
1.30 nicm 178: logfile("client");
179:
180: /* Note: event_init() has already been called. */
181:
182: /* Set up signals. */
183: memset(&sigact, 0, sizeof sigact);
184: sigemptyset(&sigact.sa_mask);
185: sigact.sa_flags = SA_RESTART;
186: sigact.sa_handler = SIG_IGN;
187: if (sigaction(SIGINT, &sigact, NULL) != 0)
188: fatal("sigaction failed");
189: if (sigaction(SIGPIPE, &sigact, NULL) != 0)
190: fatal("sigaction failed");
191: if (sigaction(SIGUSR1, &sigact, NULL) != 0)
192: fatal("sigaction failed");
193: if (sigaction(SIGUSR2, &sigact, NULL) != 0)
194: fatal("sigaction failed");
195: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
196: fatal("sigaction failed");
1.1 nicm 197:
1.30 nicm 198: signal_set(&ev_sigcont, SIGCONT, client_signal, NULL);
199: signal_add(&ev_sigcont, NULL);
200: signal_set(&ev_sigterm, SIGTERM, client_signal, NULL);
201: signal_add(&ev_sigterm, NULL);
202: signal_set(&ev_sigwinch, SIGWINCH, client_signal, NULL);
203: signal_add(&ev_sigwinch, NULL);
1.1 nicm 204:
1.17 nicm 205: /*
206: * imsg_read in the first client poll loop (before the terminal has
1.30 nicm 207: * been initialised) may have read messages into the buffer after the
208: * MSG_READY switched to here. Process anything outstanding now to
209: * avoid hanging waiting for messages that have already arrived.
1.17 nicm 210: */
1.25 nicm 211: if (client_dispatch() != 0)
1.17 nicm 212: goto out;
213:
1.31 nicm 214: /* Set the event and dispatch. */
1.32 nicm 215: client_update_event();
1.30 nicm 216: event_dispatch();
1.17 nicm 217:
218: out:
1.25 nicm 219: /* Print the exit message, if any, and exit. */
1.32 nicm 220: if (client_exitmsg != NULL && !login_shell)
221: printf("[%s]\n", client_exitmsg);
222: exit(client_exitval);
1.9 nicm 223: }
224:
1.34 ! nicm 225: /* ARGSUSED */
1.30 nicm 226: void
1.31 nicm 227: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 228: {
229: struct sigaction sigact;
230:
231: switch (sig) {
232: case SIGTERM:
233: client_exitmsg = "terminated";
1.32 nicm 234: client_exitval = 1;
1.30 nicm 235: client_write_server(MSG_EXITING, NULL, 0);
236: break;
237: case SIGWINCH:
238: client_write_server(MSG_RESIZE, NULL, 0);
239: break;
240: case SIGCONT:
241: memset(&sigact, 0, sizeof sigact);
242: sigemptyset(&sigact.sa_mask);
243: sigact.sa_flags = SA_RESTART;
244: sigact.sa_handler = SIG_IGN;
245: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
246: fatal("sigaction failed");
247: client_write_server(MSG_WAKEUP, NULL, 0);
248: break;
249: }
250:
1.31 nicm 251: client_update_event();
1.30 nicm 252: }
253:
1.34 ! nicm 254: /* ARGSUSED */
1.30 nicm 255: void
256: client_callback(unused int fd, short events, unused void *data)
257: {
1.33 nicm 258: ssize_t n;
1.30 nicm 259:
260: if (events & EV_READ) {
261: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
262: goto lost_server;
263: if (client_dispatch() != 0) {
264: event_loopexit(NULL);
265: return;
266: }
267: }
268:
269: if (events & EV_WRITE) {
270: if (msgbuf_write(&client_ibuf.w) < 0)
271: goto lost_server;
272: }
273:
1.31 nicm 274: client_update_event();
1.30 nicm 275: return;
276:
277: lost_server:
278: client_exitmsg = "lost server";
1.32 nicm 279: client_exitval = 1;
1.30 nicm 280: event_loopexit(NULL);
281: }
282:
1.9 nicm 283: int
1.25 nicm 284: client_dispatch(void)
1.9 nicm 285: {
1.30 nicm 286: struct imsg imsg;
287: struct msg_lock_data lockdata;
288: struct sigaction sigact;
289: ssize_t n, datalen;
1.9 nicm 290:
291: for (;;) {
1.25 nicm 292: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 293: fatalx("imsg_get failed");
294: if (n == 0)
1.9 nicm 295: return (0);
1.12 nicm 296: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 297:
1.30 nicm 298: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 299: switch (imsg.hdr.type) {
1.9 nicm 300: case MSG_DETACH:
1.12 nicm 301: if (datalen != 0)
1.9 nicm 302: fatalx("bad MSG_DETACH size");
303:
1.25 nicm 304: client_write_server(MSG_EXITING, NULL, 0);
305: client_exitmsg = "detached";
1.9 nicm 306: break;
307: case MSG_EXIT:
1.12 nicm 308: if (datalen != 0)
1.9 nicm 309: fatalx("bad MSG_EXIT size");
1.12 nicm 310:
1.25 nicm 311: client_write_server(MSG_EXITING, NULL, 0);
312: client_exitmsg = "exited";
1.9 nicm 313: break;
314: case MSG_EXITED:
1.12 nicm 315: if (datalen != 0)
1.9 nicm 316: fatalx("bad MSG_EXITED size");
317:
1.12 nicm 318: imsg_free(&imsg);
1.9 nicm 319: return (-1);
320: case MSG_SHUTDOWN:
1.12 nicm 321: if (datalen != 0)
1.9 nicm 322: fatalx("bad MSG_SHUTDOWN size");
323:
1.25 nicm 324: client_write_server(MSG_EXITING, NULL, 0);
325: client_exitmsg = "server exited";
1.32 nicm 326: client_exitval = 1;
1.9 nicm 327: break;
328: case MSG_SUSPEND:
1.12 nicm 329: if (datalen != 0)
1.9 nicm 330: fatalx("bad MSG_SUSPEND size");
331:
1.30 nicm 332: memset(&sigact, 0, sizeof sigact);
333: sigemptyset(&sigact.sa_mask);
334: sigact.sa_flags = SA_RESTART;
335: sigact.sa_handler = SIG_DFL;
336: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
337: fatal("sigaction failed");
338: kill(getpid(), SIGTSTP);
1.21 nicm 339: break;
340: case MSG_LOCK:
341: if (datalen != sizeof lockdata)
342: fatalx("bad MSG_LOCK size");
343: memcpy(&lockdata, imsg.data, sizeof lockdata);
344:
345: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
346: system(lockdata.cmd);
1.25 nicm 347: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 348: break;
349: default:
350: fatalx("unexpected message");
351: }
1.12 nicm 352:
353: imsg_free(&imsg);
1.9 nicm 354: }
1.1 nicm 355: }
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