Annotation of src/usr.bin/tmux/client.c, Revision 1.19
1.19 ! nicm 1: /* $OpenBSD: client.c,v 1.18 2009/09/20 14:58:12 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>
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:
1.11 nicm 36: void client_send_environ(struct client_ctx *);
1.1 nicm 37: void client_handle_winch(struct client_ctx *);
38:
39: int
1.4 nicm 40: client_init(char *path, struct client_ctx *cctx, int cmdflags, int flags)
1.1 nicm 41: {
42: struct sockaddr_un sa;
43: struct stat sb;
44: struct msg_identify_data data;
45: struct winsize ws;
46: size_t size;
1.14 nicm 47: int fd, fd2, mode;
1.19 ! nicm 48: char *term;
1.2 nicm 49: char rpathbuf[MAXPATHLEN];
50:
51: if (realpath(path, rpathbuf) == NULL)
52: strlcpy(rpathbuf, path, sizeof rpathbuf);
53: setproctitle("client (%s)", rpathbuf);
1.1 nicm 54:
55: if (lstat(path, &sb) != 0) {
1.4 nicm 56: if (cmdflags & CMD_STARTSERVER && errno == ENOENT) {
1.10 nicm 57: if ((fd = server_start(path)) == -1)
1.1 nicm 58: goto start_failed;
59: goto server_started;
60: }
61: goto not_found;
62: }
63: if (!S_ISSOCK(sb.st_mode)) {
64: errno = ENOTSOCK;
65: goto not_found;
66: }
67:
68: memset(&sa, 0, sizeof sa);
69: sa.sun_family = AF_UNIX;
70: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
71: if (size >= sizeof sa.sun_path) {
72: errno = ENAMETOOLONG;
73: goto not_found;
74: }
75:
1.10 nicm 76: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 77: fatal("socket failed");
1.1 nicm 78:
1.10 nicm 79: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.1 nicm 80: if (errno == ECONNREFUSED) {
1.4 nicm 81: if (unlink(path) != 0 || !(cmdflags & CMD_STARTSERVER))
1.1 nicm 82: goto not_found;
1.10 nicm 83: if ((fd = server_start(path)) == -1)
1.1 nicm 84: goto start_failed;
85: goto server_started;
86: }
87: goto not_found;
88: }
89:
90: server_started:
1.10 nicm 91: if ((mode = fcntl(fd, F_GETFL)) == -1)
1.1 nicm 92: fatal("fcntl failed");
1.10 nicm 93: if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
1.1 nicm 94: fatal("fcntl failed");
1.12 nicm 95: imsg_init(&cctx->ibuf, fd);
1.1 nicm 96:
1.11 nicm 97: if (cmdflags & CMD_SENDENVIRON)
98: client_send_environ(cctx);
1.1 nicm 99: if (isatty(STDIN_FILENO)) {
100: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
101: fatal("ioctl(TIOCGWINSZ)");
102: data.flags = flags;
103: data.sx = ws.ws_col;
104: data.sy = ws.ws_row;
1.7 nicm 105:
1.1 nicm 106: if (getcwd(data.cwd, sizeof data.cwd) == NULL)
107: *data.cwd = '\0';
108:
1.7 nicm 109: *data.term = '\0';
110: if ((term = getenv("TERM")) != NULL) {
111: if (strlcpy(data.term,
112: term, sizeof data.term) >= sizeof data.term)
113: *data.term = '\0';
114: }
115:
1.19 ! nicm 116: if ((fd2 = dup(STDIN_FILENO)) == -1)
! 117: fatal("dup failed");
1.13 nicm 118: imsg_compose(&cctx->ibuf, MSG_IDENTIFY,
1.14 nicm 119: PROTOCOL_VERSION, -1, fd2, &data, sizeof data);
1.1 nicm 120: }
121:
122: return (0);
123:
124: start_failed:
125: log_warnx("server failed to start");
126: return (1);
127:
128: not_found:
129: log_warn("server not found");
130: return (1);
131: }
132:
1.11 nicm 133: void
134: client_send_environ(struct client_ctx *cctx)
135: {
136: char **var;
137: struct msg_environ_data data;
138:
139: for (var = environ; *var != NULL; var++) {
140: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
141: continue;
142: client_write_server(cctx, MSG_ENVIRON, &data, sizeof data);
143: }
144: }
145:
1.1 nicm 146: int
147: client_main(struct client_ctx *cctx)
148: {
149: struct pollfd pfd;
1.17 nicm 150: int n, nfds;
1.1 nicm 151:
152: siginit();
153:
154: logfile("client");
155:
1.17 nicm 156: /*
157: * imsg_read in the first client poll loop (before the terminal has
158: * been initialiased) may have read messages into the buffer after the
159: * MSG_READY switched to here. Process anything outstanding now so poll
160: * doesn't hang waiting for messages that have already arrived.
161: */
162: if (client_msg_dispatch(cctx) != 0)
163: goto out;
164:
1.8 nicm 165: for (;;) {
166: if (sigterm)
167: client_write_server(cctx, MSG_EXITING, NULL, 0);
1.1 nicm 168: if (sigchld) {
169: waitpid(WAIT_ANY, NULL, WNOHANG);
170: sigchld = 0;
171: }
172: if (sigwinch)
173: client_handle_winch(cctx);
174: if (sigcont) {
175: siginit();
176: client_write_server(cctx, MSG_WAKEUP, NULL, 0);
177: sigcont = 0;
178: }
179:
1.12 nicm 180: pfd.fd = cctx->ibuf.fd;
1.1 nicm 181: pfd.events = POLLIN;
1.12 nicm 182: if (cctx->ibuf.w.queued > 0)
1.1 nicm 183: pfd.events |= POLLOUT;
184:
1.12 nicm 185: if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
1.1 nicm 186: if (errno == EAGAIN || errno == EINTR)
187: continue;
188: fatal("poll failed");
189: }
1.12 nicm 190: if (nfds == 0)
191: continue;
192:
193: if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
194: fatalx("socket error");
1.1 nicm 195:
1.12 nicm 196: if (pfd.revents & POLLIN) {
1.17 nicm 197: if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
198: cctx->exittype = CCTX_DIED;
199: break;
200: }
1.12 nicm 201: if (client_msg_dispatch(cctx) != 0)
202: break;
1.5 nicm 203: }
1.9 nicm 204:
1.12 nicm 205: if (pfd.revents & POLLOUT) {
206: if (msgbuf_write(&cctx->ibuf.w) < 0) {
207: cctx->exittype = CCTX_DIED;
208: break;
209: }
210: }
1.1 nicm 211: }
1.17 nicm 212:
213: out:
1.1 nicm 214: if (sigterm) {
215: printf("[terminated]\n");
216: return (1);
217: }
1.5 nicm 218: switch (cctx->exittype) {
219: case CCTX_DIED:
220: printf("[lost server]\n");
221: return (0);
222: case CCTX_SHUTDOWN:
1.1 nicm 223: printf("[server exited]\n");
224: return (0);
1.5 nicm 225: case CCTX_EXIT:
1.16 nicm 226: if (cctx->errstr != NULL) {
227: printf("[error: %s]\n", cctx->errstr);
228: return (1);
229: }
1.1 nicm 230: printf("[exited]\n");
231: return (0);
1.5 nicm 232: case CCTX_DETACH:
1.1 nicm 233: printf("[detached]\n");
234: return (0);
1.5 nicm 235: default:
1.16 nicm 236: printf("[unknown error]\n");
1.5 nicm 237: return (1);
1.1 nicm 238: }
239: }
240:
241: void
242: client_handle_winch(struct client_ctx *cctx)
243: {
244: struct msg_resize_data data;
245: struct winsize ws;
246:
247: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
248: fatal("ioctl failed");
249:
250: data.sx = ws.ws_col;
251: data.sy = ws.ws_row;
252: client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
253:
254: sigwinch = 0;
1.9 nicm 255: }
256:
257: int
258: client_msg_dispatch(struct client_ctx *cctx)
259: {
1.12 nicm 260: struct imsg imsg;
1.9 nicm 261: struct msg_print_data printdata;
1.12 nicm 262: ssize_t n, datalen;
1.9 nicm 263:
264: for (;;) {
1.12 nicm 265: if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1)
266: fatalx("imsg_get failed");
267: if (n == 0)
1.9 nicm 268: return (0);
1.12 nicm 269: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 270:
1.12 nicm 271: switch (imsg.hdr.type) {
1.9 nicm 272: case MSG_DETACH:
1.12 nicm 273: if (datalen != 0)
1.9 nicm 274: fatalx("bad MSG_DETACH size");
275:
276: client_write_server(cctx, MSG_EXITING, NULL, 0);
277: cctx->exittype = CCTX_DETACH;
278: break;
279: case MSG_ERROR:
1.12 nicm 280: if (datalen != sizeof printdata)
281: fatalx("bad MSG_ERROR size");
282: memcpy(&printdata, imsg.data, sizeof printdata);
1.11 nicm 283:
1.9 nicm 284: printdata.msg[(sizeof printdata.msg) - 1] = '\0';
1.16 nicm 285: /* Error string used after exit message from server. */
1.9 nicm 286: cctx->errstr = xstrdup(printdata.msg);
1.12 nicm 287: imsg_free(&imsg);
1.9 nicm 288: return (-1);
289: case MSG_EXIT:
1.12 nicm 290: if (datalen != 0)
1.9 nicm 291: fatalx("bad MSG_EXIT size");
1.12 nicm 292:
1.9 nicm 293: client_write_server(cctx, MSG_EXITING, NULL, 0);
294: cctx->exittype = CCTX_EXIT;
295: break;
296: case MSG_EXITED:
1.12 nicm 297: if (datalen != 0)
1.9 nicm 298: fatalx("bad MSG_EXITED size");
299:
1.12 nicm 300: imsg_free(&imsg);
1.9 nicm 301: return (-1);
302: case MSG_SHUTDOWN:
1.12 nicm 303: if (datalen != 0)
1.9 nicm 304: fatalx("bad MSG_SHUTDOWN size");
305:
306: client_write_server(cctx, MSG_EXITING, NULL, 0);
307: cctx->exittype = CCTX_SHUTDOWN;
308: break;
309: case MSG_SUSPEND:
1.12 nicm 310: if (datalen != 0)
1.9 nicm 311: fatalx("bad MSG_SUSPEND size");
312:
313: client_suspend();
314: break;
315: default:
316: fatalx("unexpected message");
317: }
1.12 nicm 318:
319: imsg_free(&imsg);
1.9 nicm 320: }
1.1 nicm 321: }