Annotation of src/usr.bin/tmux/client.c, Revision 1.15
1.15 ! nicm 1: /* $OpenBSD: client.c,v 1.14 2009/08/12 06:04:28 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;
1.7 nicm 48: char *name, *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)
1.1 nicm 77: fatal("socket");
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:
116: *data.tty = '\0';
1.1 nicm 117: if ((name = ttyname(STDIN_FILENO)) == NULL)
118: fatal("ttyname failed");
119: if (strlcpy(data.tty, name, sizeof data.tty) >= sizeof data.tty)
120: fatalx("ttyname failed");
121:
1.14 nicm 122: fd2 = dup(STDIN_FILENO);
1.13 nicm 123: imsg_compose(&cctx->ibuf, MSG_IDENTIFY,
1.14 nicm 124: PROTOCOL_VERSION, -1, fd2, &data, sizeof data);
1.1 nicm 125: }
126:
127: return (0);
128:
129: start_failed:
130: log_warnx("server failed to start");
131: return (1);
132:
133: not_found:
134: log_warn("server not found");
135: return (1);
136: }
137:
1.11 nicm 138: void
139: client_send_environ(struct client_ctx *cctx)
140: {
141: char **var;
142: struct msg_environ_data data;
143:
144: for (var = environ; *var != NULL; var++) {
145: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
146: continue;
147: client_write_server(cctx, MSG_ENVIRON, &data, sizeof data);
148: }
149: }
150:
1.1 nicm 151: int
152: client_main(struct client_ctx *cctx)
153: {
154: struct pollfd pfd;
1.12 nicm 155: int nfds;
1.1 nicm 156:
157: siginit();
158:
159: logfile("client");
160:
1.8 nicm 161: for (;;) {
162: if (sigterm)
163: client_write_server(cctx, MSG_EXITING, NULL, 0);
1.1 nicm 164: if (sigchld) {
165: waitpid(WAIT_ANY, NULL, WNOHANG);
166: sigchld = 0;
167: }
168: if (sigwinch)
169: client_handle_winch(cctx);
170: if (sigcont) {
171: siginit();
172: client_write_server(cctx, MSG_WAKEUP, NULL, 0);
173: sigcont = 0;
174: }
175:
1.12 nicm 176: pfd.fd = cctx->ibuf.fd;
1.1 nicm 177: pfd.events = POLLIN;
1.12 nicm 178: if (cctx->ibuf.w.queued > 0)
1.1 nicm 179: pfd.events |= POLLOUT;
180:
1.12 nicm 181: if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
1.1 nicm 182: if (errno == EAGAIN || errno == EINTR)
183: continue;
184: fatal("poll failed");
185: }
1.12 nicm 186: if (nfds == 0)
187: continue;
188:
189: if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
190: fatalx("socket error");
1.1 nicm 191:
1.12 nicm 192: if (pfd.revents & POLLIN) {
193: if (client_msg_dispatch(cctx) != 0)
194: break;
1.5 nicm 195: }
1.9 nicm 196:
1.12 nicm 197: if (pfd.revents & POLLOUT) {
198: if (msgbuf_write(&cctx->ibuf.w) < 0) {
199: cctx->exittype = CCTX_DIED;
200: break;
201: }
202: }
1.1 nicm 203: }
1.15 ! nicm 204:
1.1 nicm 205: if (sigterm) {
206: printf("[terminated]\n");
207: return (1);
208: }
1.5 nicm 209: switch (cctx->exittype) {
210: case CCTX_DIED:
211: printf("[lost server]\n");
212: return (0);
213: case CCTX_SHUTDOWN:
1.1 nicm 214: printf("[server exited]\n");
215: return (0);
1.5 nicm 216: case CCTX_EXIT:
1.1 nicm 217: printf("[exited]\n");
218: return (0);
1.5 nicm 219: case CCTX_DETACH:
1.1 nicm 220: printf("[detached]\n");
221: return (0);
1.15 ! nicm 222: case CCTX_ERROR:
! 223: printf("[error: %s]\n", cctx->errstr);
! 224: return (1);
1.5 nicm 225: default:
1.15 ! nicm 226: printf("[error: unknown error]\n");
1.5 nicm 227: return (1);
1.1 nicm 228: }
229: }
230:
231: void
232: client_handle_winch(struct client_ctx *cctx)
233: {
234: struct msg_resize_data data;
235: struct winsize ws;
236:
237: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
238: fatal("ioctl failed");
239:
240: data.sx = ws.ws_col;
241: data.sy = ws.ws_row;
242: client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
243:
244: sigwinch = 0;
1.9 nicm 245: }
246:
247: int
248: client_msg_dispatch(struct client_ctx *cctx)
249: {
1.12 nicm 250: struct imsg imsg;
1.9 nicm 251: struct msg_print_data printdata;
1.12 nicm 252: ssize_t n, datalen;
253:
254: if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
255: cctx->exittype = CCTX_DIED;
256: return (-1);
257: }
1.9 nicm 258:
259: for (;;) {
1.12 nicm 260: if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1)
261: fatalx("imsg_get failed");
262: if (n == 0)
1.9 nicm 263: return (0);
1.12 nicm 264: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 265:
1.12 nicm 266: switch (imsg.hdr.type) {
1.9 nicm 267: case MSG_DETACH:
1.12 nicm 268: if (datalen != 0)
1.9 nicm 269: fatalx("bad MSG_DETACH size");
270:
271: client_write_server(cctx, MSG_EXITING, NULL, 0);
272: cctx->exittype = CCTX_DETACH;
273: break;
274: case MSG_ERROR:
1.12 nicm 275: if (datalen != sizeof printdata)
276: fatalx("bad MSG_ERROR size");
277: memcpy(&printdata, imsg.data, sizeof printdata);
1.11 nicm 278:
1.9 nicm 279: printdata.msg[(sizeof printdata.msg) - 1] = '\0';
280: cctx->errstr = xstrdup(printdata.msg);
1.15 ! nicm 281: cctx->exittype = CCTX_ERROR;
1.12 nicm 282: imsg_free(&imsg);
1.9 nicm 283: return (-1);
284: case MSG_EXIT:
1.12 nicm 285: if (datalen != 0)
1.9 nicm 286: fatalx("bad MSG_EXIT size");
1.12 nicm 287:
1.9 nicm 288: client_write_server(cctx, MSG_EXITING, NULL, 0);
289: cctx->exittype = CCTX_EXIT;
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:
301: client_write_server(cctx, MSG_EXITING, NULL, 0);
302: cctx->exittype = CCTX_SHUTDOWN;
303: break;
304: case MSG_SUSPEND:
1.12 nicm 305: if (datalen != 0)
1.9 nicm 306: fatalx("bad MSG_SUSPEND size");
307:
308: client_suspend();
309: break;
310: default:
311: fatalx("unexpected message");
312: }
1.12 nicm 313:
314: imsg_free(&imsg);
1.9 nicm 315: }
1.1 nicm 316: }
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