1: /* $OpenBSD$ */
2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
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/stat.h>
21:
22: #include <errno.h>
23: #include <event.h>
24: #include <fcntl.h>
25: #include <getopt.h>
26: #include <langinfo.h>
27: #include <locale.h>
28: #include <pwd.h>
29: #include <stdlib.h>
30: #include <string.h>
31: #include <time.h>
32: #include <unistd.h>
33:
34: #include "tmux.h"
35:
36: struct options *global_options; /* server options */
37: struct options *global_s_options; /* session options */
38: struct options *global_w_options; /* window options */
39: struct environ *global_environ;
40: struct hooks *global_hooks;
41:
42: struct timeval start_time;
43: const char *socket_path;
44: int ptm_fd = -1;
45:
46: static __dead void usage(void);
47: static char *make_label(const char *);
48:
49: static const char *getshell(void);
50: static int checkshell(const char *);
51:
52: static __dead void
53: usage(void)
54: {
55: fprintf(stderr,
56: "usage: %s [-2CluvV] [-c shell-command] [-f file] [-L socket-name]\n"
57: " [-S socket-path] [command [flags]]\n",
58: getprogname());
59: exit(1);
60: }
61:
62: static const char *
63: getshell(void)
64: {
65: struct passwd *pw;
66: const char *shell;
67:
68: shell = getenv("SHELL");
69: if (checkshell(shell))
70: return (shell);
71:
72: pw = getpwuid(getuid());
73: if (pw != NULL && checkshell(pw->pw_shell))
74: return (pw->pw_shell);
75:
76: return (_PATH_BSHELL);
77: }
78:
79: static int
80: checkshell(const char *shell)
81: {
82: if (shell == NULL || *shell != '/')
83: return (0);
84: if (areshell(shell))
85: return (0);
86: if (access(shell, X_OK) != 0)
87: return (0);
88: return (1);
89: }
90:
91: int
92: areshell(const char *shell)
93: {
94: const char *progname, *ptr;
95:
96: if ((ptr = strrchr(shell, '/')) != NULL)
97: ptr++;
98: else
99: ptr = shell;
100: progname = getprogname();
101: if (*progname == '-')
102: progname++;
103: if (strcmp(ptr, progname) == 0)
104: return (1);
105: return (0);
106: }
107:
108: static char *
109: make_label(const char *label)
110: {
111: char *base, resolved[PATH_MAX], *path, *s;
112: struct stat sb;
113: uid_t uid;
114: int saved_errno;
115:
116: if (label == NULL)
117: label = "default";
118: uid = getuid();
119:
120: if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
121: xasprintf(&base, "%s/tmux-%u", s, uid);
122: else
123: xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid);
124:
125: if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
126: goto fail;
127:
128: if (lstat(base, &sb) != 0)
129: goto fail;
130: if (!S_ISDIR(sb.st_mode)) {
131: errno = ENOTDIR;
132: goto fail;
133: }
134: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
135: errno = EACCES;
136: goto fail;
137: }
138:
139: if (realpath(base, resolved) == NULL)
140: strlcpy(resolved, base, sizeof resolved);
141: xasprintf(&path, "%s/%s", resolved, label);
142:
143: free(base);
144: return (path);
145:
146: fail:
147: saved_errno = errno;
148: free(base);
149: errno = saved_errno;
150: return (NULL);
151: }
152:
153: void
154: setblocking(int fd, int state)
155: {
156: int mode;
157:
158: if ((mode = fcntl(fd, F_GETFL)) != -1) {
159: if (!state)
160: mode |= O_NONBLOCK;
161: else
162: mode &= ~O_NONBLOCK;
163: fcntl(fd, F_SETFL, mode);
164: }
165: }
166:
167: const char *
168: find_home(void)
169: {
170: struct passwd *pw;
171: static const char *home;
172:
173: if (home != NULL)
174: return (home);
175:
176: home = getenv("HOME");
177: if (home == NULL || *home == '\0') {
178: pw = getpwuid(getuid());
179: if (pw != NULL)
180: home = pw->pw_dir;
181: else
182: home = NULL;
183: }
184:
185: return (home);
186: }
187:
188: int
189: main(int argc, char **argv)
190: {
191: char *path, *label, tmp[PATH_MAX];
192: char *shellcmd = NULL, **var;
193: const char *s, *shell;
194: int opt, flags, keys;
195: const struct options_table_entry *oe;
196:
197: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL) {
198: if (setlocale(LC_CTYPE, "") == NULL)
199: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
200: s = nl_langinfo(CODESET);
201: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
202: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
203: }
204:
205: setlocale(LC_TIME, "");
206: tzset();
207:
208: if (**argv == '-')
209: flags = CLIENT_LOGIN;
210: else
211: flags = 0;
212:
213: label = path = NULL;
214: while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUVv")) != -1) {
215: switch (opt) {
216: case '2':
217: flags |= CLIENT_256COLOURS;
218: break;
219: case 'c':
220: free(shellcmd);
221: shellcmd = xstrdup(optarg);
222: break;
223: case 'C':
224: if (flags & CLIENT_CONTROL)
225: flags |= CLIENT_CONTROLCONTROL;
226: else
227: flags |= CLIENT_CONTROL;
228: break;
229: case 'V':
230: printf("%s %s\n", getprogname(), VERSION);
231: exit(0);
232: case 'f':
233: set_cfg_file(optarg);
234: break;
235: case 'l':
236: flags |= CLIENT_LOGIN;
237: break;
238: case 'L':
239: free(label);
240: label = xstrdup(optarg);
241: break;
242: case 'q':
243: break;
244: case 'S':
245: free(path);
246: path = xstrdup(optarg);
247: break;
248: case 'u':
249: flags |= CLIENT_UTF8;
250: break;
251: case 'v':
252: log_add_level();
253: break;
254: default:
255: usage();
256: }
257: }
258: argc -= optind;
259: argv += optind;
260:
261: if (shellcmd != NULL && argc != 0)
262: usage();
263:
264: if (pty_open(&ptm_fd) != 0)
265: errx(1, "open(\"/dev/ptm\"");
266: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
267: "recvfd proc exec tty ps", NULL) != 0)
268: err(1, "pledge");
269:
270: /*
271: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
272: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
273: * UTF-8, it is a safe assumption that either they are using a UTF-8
274: * terminal, or if not they know that output from UTF-8-capable
275: * programs may be wrong.
276: */
277: if (getenv("TMUX") != NULL)
278: flags |= CLIENT_UTF8;
279: else {
280: s = getenv("LC_ALL");
281: if (s == NULL || *s == '\0')
282: s = getenv("LC_CTYPE");
283: if (s == NULL || *s == '\0')
284: s = getenv("LANG");
285: if (s == NULL || *s == '\0')
286: s = "";
287: if (strcasestr(s, "UTF-8") != NULL ||
288: strcasestr(s, "UTF8") != NULL)
289: flags |= CLIENT_UTF8;
290: }
291:
292: global_hooks = hooks_create(NULL);
293:
294: global_environ = environ_create();
295: for (var = environ; *var != NULL; var++)
296: environ_put(global_environ, *var);
297: if (getcwd(tmp, sizeof tmp) != NULL)
298: environ_set(global_environ, "PWD", "%s", tmp);
299:
300: global_options = options_create(NULL);
301: global_s_options = options_create(NULL);
302: global_w_options = options_create(NULL);
303: for (oe = options_table; oe->name != NULL; oe++) {
304: if (oe->scope == OPTIONS_TABLE_SERVER)
305: options_default(global_options, oe);
306: if (oe->scope == OPTIONS_TABLE_SESSION)
307: options_default(global_s_options, oe);
308: if (oe->scope == OPTIONS_TABLE_WINDOW)
309: options_default(global_w_options, oe);
310: }
311:
312: /*
313: * The default shell comes from SHELL or from the user's passwd entry
314: * if available.
315: */
316: shell = getshell();
317: options_set_string(global_s_options, "default-shell", 0, "%s", shell);
318:
319: /* Override keys to vi if VISUAL or EDITOR are set. */
320: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
321: if (strrchr(s, '/') != NULL)
322: s = strrchr(s, '/') + 1;
323: if (strstr(s, "vi") != NULL)
324: keys = MODEKEY_VI;
325: else
326: keys = MODEKEY_EMACS;
327: options_set_number(global_s_options, "status-keys", keys);
328: options_set_number(global_w_options, "mode-keys", keys);
329: }
330:
331: /*
332: * If socket is specified on the command-line with -S or -L, it is
333: * used. Otherwise, $TMUX is checked and if that fails "default" is
334: * used.
335: */
336: if (path == NULL && label == NULL) {
337: s = getenv("TMUX");
338: if (s != NULL && *s != '\0' && *s != ',') {
339: path = xstrdup(s);
340: path[strcspn(path, ",")] = '\0';
341: }
342: }
343: if (path == NULL && (path = make_label(label)) == NULL) {
344: fprintf(stderr, "can't create socket: %s\n", strerror(errno));
345: exit(1);
346: }
347: socket_path = path;
348: free(label);
349:
350: /* Pass control to the client. */
351: exit(client_main(osdep_event_init(), argc, argv, flags, shellcmd));
352: }
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