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1.13 ! nicm 1: /* $OpenBSD: client.c,v 1.12 2009/08/11 17:18:35 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;
1.10 nicm 47: int fd, 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:
1.13 ! nicm 122: imsg_compose(&cctx->ibuf, MSG_IDENTIFY,
! 123: PROTOCOL_VERSION, -1, STDIN_FILENO, &data, sizeof data);
1.1 nicm 124: }
125:
126: return (0);
127:
128: start_failed:
129: log_warnx("server failed to start");
130: return (1);
131:
132: not_found:
133: log_warn("server not found");
134: return (1);
135: }
136:
1.11 nicm 137: void
138: client_send_environ(struct client_ctx *cctx)
139: {
140: char **var;
141: struct msg_environ_data data;
142:
143: for (var = environ; *var != NULL; var++) {
144: if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
145: continue;
146: client_write_server(cctx, MSG_ENVIRON, &data, sizeof data);
147: }
148: }
149:
1.1 nicm 150: int
151: client_main(struct client_ctx *cctx)
152: {
153: struct pollfd pfd;
1.12 nicm 154: int nfds;
1.1 nicm 155:
156: siginit();
157:
158: logfile("client");
159:
1.8 nicm 160: for (;;) {
161: if (sigterm)
162: client_write_server(cctx, MSG_EXITING, NULL, 0);
1.1 nicm 163: if (sigchld) {
164: waitpid(WAIT_ANY, NULL, WNOHANG);
165: sigchld = 0;
166: }
167: if (sigwinch)
168: client_handle_winch(cctx);
169: if (sigcont) {
170: siginit();
171: client_write_server(cctx, MSG_WAKEUP, NULL, 0);
172: sigcont = 0;
173: }
174:
1.12 nicm 175: pfd.fd = cctx->ibuf.fd;
1.1 nicm 176: pfd.events = POLLIN;
1.12 nicm 177: if (cctx->ibuf.w.queued > 0)
1.1 nicm 178: pfd.events |= POLLOUT;
179:
1.12 nicm 180: if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
1.1 nicm 181: if (errno == EAGAIN || errno == EINTR)
182: continue;
183: fatal("poll failed");
184: }
1.12 nicm 185: if (nfds == 0)
186: continue;
187:
188: if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
189: fatalx("socket error");
1.1 nicm 190:
1.12 nicm 191: if (pfd.revents & POLLIN) {
192: if (client_msg_dispatch(cctx) != 0)
193: break;
1.5 nicm 194: }
1.9 nicm 195:
1.12 nicm 196: if (pfd.revents & POLLOUT) {
197: if (msgbuf_write(&cctx->ibuf.w) < 0) {
198: cctx->exittype = CCTX_DIED;
199: break;
200: }
201: }
1.1 nicm 202: }
203:
204: if (sigterm) {
205: printf("[terminated]\n");
206: return (1);
207: }
1.5 nicm 208: switch (cctx->exittype) {
209: case CCTX_DIED:
210: printf("[lost server]\n");
211: return (0);
212: case CCTX_SHUTDOWN:
1.1 nicm 213: printf("[server exited]\n");
214: return (0);
1.5 nicm 215: case CCTX_EXIT:
1.1 nicm 216: printf("[exited]\n");
217: return (0);
1.5 nicm 218: case CCTX_DETACH:
1.1 nicm 219: printf("[detached]\n");
220: return (0);
1.5 nicm 221: default:
222: printf("[error: %s]\n", cctx->errstr);
223: return (1);
1.1 nicm 224: }
225: }
226:
227: void
228: client_handle_winch(struct client_ctx *cctx)
229: {
230: struct msg_resize_data data;
231: struct winsize ws;
232:
233: if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
234: fatal("ioctl failed");
235:
236: data.sx = ws.ws_col;
237: data.sy = ws.ws_row;
238: client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
239:
240: sigwinch = 0;
1.9 nicm 241: }
242:
243: int
244: client_msg_dispatch(struct client_ctx *cctx)
245: {
1.12 nicm 246: struct imsg imsg;
1.9 nicm 247: struct msg_print_data printdata;
1.12 nicm 248: ssize_t n, datalen;
249:
250: if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
251: cctx->exittype = CCTX_DIED;
252: return (-1);
253: }
1.9 nicm 254:
255: for (;;) {
1.12 nicm 256: if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1)
257: fatalx("imsg_get failed");
258: if (n == 0)
1.9 nicm 259: return (0);
1.12 nicm 260: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 261:
1.12 nicm 262: switch (imsg.hdr.type) {
1.9 nicm 263: case MSG_DETACH:
1.12 nicm 264: if (datalen != 0)
1.9 nicm 265: fatalx("bad MSG_DETACH size");
266:
267: client_write_server(cctx, MSG_EXITING, NULL, 0);
268: cctx->exittype = CCTX_DETACH;
269: break;
270: case MSG_ERROR:
1.12 nicm 271: if (datalen != sizeof printdata)
272: fatalx("bad MSG_ERROR size");
273: memcpy(&printdata, imsg.data, sizeof printdata);
1.11 nicm 274:
1.9 nicm 275: printdata.msg[(sizeof printdata.msg) - 1] = '\0';
276: cctx->errstr = xstrdup(printdata.msg);
1.12 nicm 277: imsg_free(&imsg);
1.9 nicm 278: return (-1);
279: case MSG_EXIT:
1.12 nicm 280: if (datalen != 0)
1.9 nicm 281: fatalx("bad MSG_EXIT size");
1.12 nicm 282:
1.9 nicm 283: client_write_server(cctx, MSG_EXITING, NULL, 0);
284: cctx->exittype = CCTX_EXIT;
285: break;
286: case MSG_EXITED:
1.12 nicm 287: if (datalen != 0)
1.9 nicm 288: fatalx("bad MSG_EXITED size");
289:
1.12 nicm 290: imsg_free(&imsg);
1.9 nicm 291: return (-1);
292: case MSG_SHUTDOWN:
1.12 nicm 293: if (datalen != 0)
1.9 nicm 294: fatalx("bad MSG_SHUTDOWN size");
295:
296: client_write_server(cctx, MSG_EXITING, NULL, 0);
297: cctx->exittype = CCTX_SHUTDOWN;
298: break;
299: case MSG_SUSPEND:
1.12 nicm 300: if (datalen != 0)
1.9 nicm 301: fatalx("bad MSG_SUSPEND size");
302:
303: client_suspend();
304: break;
305: default:
306: fatalx("unexpected message");
307: }
1.12 nicm 308:
309: imsg_free(&imsg);
1.9 nicm 310: }
1.1 nicm 311: }