Annotation of src/usr.bin/tmux/client.c, Revision 1.38
1.38 ! nicm 1: /* $OpenBSD: client.c,v 1.37 2010/05/04 08:48:06 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';
1.35 nicm 128:
1.26 nicm 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:
1.35 nicm 146: for (var = environ; *var != NULL; var++) {
1.11 nicm 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: {
1.35 nicm 156: imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
1.25 nicm 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: logfile("client");
176:
177: /* Note: event_init() has already been called. */
178:
1.35 nicm 179: /* Set up signals. */
1.38 ! nicm 180: set_signals(client_signal);
1.1 nicm 181:
1.17 nicm 182: /*
183: * imsg_read in the first client poll loop (before the terminal has
1.30 nicm 184: * been initialised) may have read messages into the buffer after the
185: * MSG_READY switched to here. Process anything outstanding now to
186: * avoid hanging waiting for messages that have already arrived.
1.17 nicm 187: */
1.25 nicm 188: if (client_dispatch() != 0)
1.17 nicm 189: goto out;
190:
1.31 nicm 191: /* Set the event and dispatch. */
1.32 nicm 192: client_update_event();
1.30 nicm 193: event_dispatch();
1.17 nicm 194:
195: out:
1.25 nicm 196: /* Print the exit message, if any, and exit. */
1.32 nicm 197: if (client_exitmsg != NULL && !login_shell)
198: printf("[%s]\n", client_exitmsg);
199: exit(client_exitval);
1.9 nicm 200: }
201:
1.34 nicm 202: /* ARGSUSED */
1.30 nicm 203: void
1.31 nicm 204: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 205: {
206: struct sigaction sigact;
207:
208: switch (sig) {
209: case SIGTERM:
210: client_exitmsg = "terminated";
1.32 nicm 211: client_exitval = 1;
1.30 nicm 212: client_write_server(MSG_EXITING, NULL, 0);
213: break;
214: case SIGWINCH:
215: client_write_server(MSG_RESIZE, NULL, 0);
216: break;
217: case SIGCONT:
218: memset(&sigact, 0, sizeof sigact);
219: sigemptyset(&sigact.sa_mask);
220: sigact.sa_flags = SA_RESTART;
221: sigact.sa_handler = SIG_IGN;
222: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
223: fatal("sigaction failed");
224: client_write_server(MSG_WAKEUP, NULL, 0);
225: break;
226: }
227:
1.31 nicm 228: client_update_event();
1.30 nicm 229: }
230:
1.34 nicm 231: /* ARGSUSED */
1.30 nicm 232: void
233: client_callback(unused int fd, short events, unused void *data)
234: {
1.33 nicm 235: ssize_t n;
1.30 nicm 236:
237: if (events & EV_READ) {
238: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
239: goto lost_server;
240: if (client_dispatch() != 0) {
241: event_loopexit(NULL);
242: return;
1.35 nicm 243: }
1.30 nicm 244: }
1.35 nicm 245:
1.30 nicm 246: if (events & EV_WRITE) {
247: if (msgbuf_write(&client_ibuf.w) < 0)
248: goto lost_server;
249: }
250:
1.31 nicm 251: client_update_event();
1.30 nicm 252: return;
253:
254: lost_server:
255: client_exitmsg = "lost server";
1.32 nicm 256: client_exitval = 1;
1.30 nicm 257: event_loopexit(NULL);
258: }
259:
1.9 nicm 260: int
1.25 nicm 261: client_dispatch(void)
1.9 nicm 262: {
1.30 nicm 263: struct imsg imsg;
264: struct msg_lock_data lockdata;
265: struct sigaction sigact;
266: ssize_t n, datalen;
1.9 nicm 267:
268: for (;;) {
1.25 nicm 269: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 270: fatalx("imsg_get failed");
271: if (n == 0)
1.9 nicm 272: return (0);
1.12 nicm 273: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 274:
1.30 nicm 275: log_debug("client got %d", imsg.hdr.type);
1.12 nicm 276: switch (imsg.hdr.type) {
1.9 nicm 277: case MSG_DETACH:
1.12 nicm 278: if (datalen != 0)
1.9 nicm 279: fatalx("bad MSG_DETACH size");
280:
1.25 nicm 281: client_write_server(MSG_EXITING, NULL, 0);
282: client_exitmsg = "detached";
1.9 nicm 283: break;
284: case MSG_EXIT:
1.12 nicm 285: if (datalen != 0)
1.9 nicm 286: fatalx("bad MSG_EXIT size");
1.12 nicm 287:
1.25 nicm 288: client_write_server(MSG_EXITING, NULL, 0);
289: client_exitmsg = "exited";
1.9 nicm 290: break;
291: case MSG_EXITED:
1.12 nicm 292: if (datalen != 0)
1.9 nicm 293: fatalx("bad MSG_EXITED size");
294:
1.12 nicm 295: imsg_free(&imsg);
1.9 nicm 296: return (-1);
297: case MSG_SHUTDOWN:
1.12 nicm 298: if (datalen != 0)
1.9 nicm 299: fatalx("bad MSG_SHUTDOWN size");
300:
1.25 nicm 301: client_write_server(MSG_EXITING, NULL, 0);
302: client_exitmsg = "server exited";
1.32 nicm 303: client_exitval = 1;
1.9 nicm 304: break;
305: case MSG_SUSPEND:
1.12 nicm 306: if (datalen != 0)
1.9 nicm 307: fatalx("bad MSG_SUSPEND size");
308:
1.30 nicm 309: memset(&sigact, 0, sizeof sigact);
310: sigemptyset(&sigact.sa_mask);
311: sigact.sa_flags = SA_RESTART;
312: sigact.sa_handler = SIG_DFL;
313: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
314: fatal("sigaction failed");
315: kill(getpid(), SIGTSTP);
1.21 nicm 316: break;
317: case MSG_LOCK:
318: if (datalen != sizeof lockdata)
319: fatalx("bad MSG_LOCK size");
320: memcpy(&lockdata, imsg.data, sizeof lockdata);
1.35 nicm 321:
1.21 nicm 322: lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
323: system(lockdata.cmd);
1.25 nicm 324: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 325: break;
326: default:
327: fatalx("unexpected message");
328: }
1.12 nicm 329:
330: imsg_free(&imsg);
1.9 nicm 331: }
1.1 nicm 332: }
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