Annotation of src/usr.bin/tmux/tmux.c, Revision 1.192
1.192 ! nicm 1: /* $OpenBSD: tmux.c,v 1.191 2020/01/28 10:44:30 nicm Exp $ */
1.1 nicm 2:
3: /*
1.164 nicm 4: * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
1.1 nicm 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>
1.191 nicm 21: #include <sys/utsname.h>
1.1 nicm 22:
1.145 nicm 23: #include <err.h>
1.1 nicm 24: #include <errno.h>
1.55 nicm 25: #include <event.h>
1.91 nicm 26: #include <fcntl.h>
1.168 nicm 27: #include <langinfo.h>
1.119 nicm 28: #include <locale.h>
1.1 nicm 29: #include <paths.h>
30: #include <pwd.h>
31: #include <stdlib.h>
32: #include <string.h>
1.147 nicm 33: #include <time.h>
1.1 nicm 34: #include <unistd.h>
1.181 nicm 35: #include <util.h>
1.1 nicm 36:
37: #include "tmux.h"
38:
1.148 nicm 39: struct options *global_options; /* server options */
40: struct options *global_s_options; /* session options */
41: struct options *global_w_options; /* window options */
1.149 nicm 42: struct environ *global_environ;
1.1 nicm 43:
1.158 nicm 44: struct timeval start_time;
1.160 nicm 45: const char *socket_path;
1.176 nicm 46: int ptm_fd = -1;
1.184 nicm 47: const char *shell_command;
1.70 nicm 48:
1.171 nicm 49: static __dead void usage(void);
1.186 nicm 50: static char *make_label(const char *, char **);
1.55 nicm 51:
1.172 nicm 52: static const char *getshell(void);
53: static int checkshell(const char *);
54:
1.171 nicm 55: static __dead void
1.1 nicm 56: usage(void)
57: {
1.4 sobrado 58: fprintf(stderr,
1.192 ! nicm 59: "usage: %s [-2CluvV] [-c shell-command] [-f file] [-L socket-name]\n"
1.41 nicm 60: " [-S socket-path] [command [flags]]\n",
1.170 nicm 61: getprogname());
1.1 nicm 62: exit(1);
63: }
64:
1.172 nicm 65: static const char *
1.39 nicm 66: getshell(void)
67: {
68: struct passwd *pw;
69: const char *shell;
70:
71: shell = getenv("SHELL");
72: if (checkshell(shell))
73: return (shell);
74:
75: pw = getpwuid(getuid());
76: if (pw != NULL && checkshell(pw->pw_shell))
77: return (pw->pw_shell);
78:
79: return (_PATH_BSHELL);
80: }
81:
1.172 nicm 82: static int
1.39 nicm 83: checkshell(const char *shell)
84: {
1.177 nicm 85: if (shell == NULL || *shell != '/')
1.105 nicm 86: return (0);
87: if (areshell(shell))
1.39 nicm 88: return (0);
89: if (access(shell, X_OK) != 0)
90: return (0);
91: return (1);
92: }
93:
94: int
95: areshell(const char *shell)
96: {
97: const char *progname, *ptr;
98:
99: if ((ptr = strrchr(shell, '/')) != NULL)
100: ptr++;
101: else
102: ptr = shell;
1.170 nicm 103: progname = getprogname();
1.39 nicm 104: if (*progname == '-')
105: progname++;
106: if (strcmp(ptr, progname) == 0)
107: return (1);
108: return (0);
1.107 nicm 109: }
110:
1.160 nicm 111: static char *
1.186 nicm 112: make_label(const char *label, char **cause)
1.1 nicm 113: {
1.160 nicm 114: char *base, resolved[PATH_MAX], *path, *s;
115: struct stat sb;
1.178 nicm 116: uid_t uid;
1.186 nicm 117:
118: *cause = NULL;
1.160 nicm 119:
120: if (label == NULL)
121: label = "default";
1.1 nicm 122: uid = getuid();
1.160 nicm 123:
1.118 nicm 124: if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
1.180 nicm 125: xasprintf(&base, "%s/tmux-%ld", s, (long)uid);
1.118 nicm 126: else
1.178 nicm 127: xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid);
1.186 nicm 128: if (realpath(base, resolved) == NULL &&
129: strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) {
130: errno = ERANGE;
131: free(base);
132: goto fail;
133: }
1.190 nicm 134: free(base);
1.1 nicm 135:
1.186 nicm 136: if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST)
1.160 nicm 137: goto fail;
1.186 nicm 138: if (lstat(resolved, &sb) != 0)
1.160 nicm 139: goto fail;
1.1 nicm 140: if (!S_ISDIR(sb.st_mode)) {
141: errno = ENOTDIR;
1.160 nicm 142: goto fail;
1.1 nicm 143: }
1.134 nicm 144: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
1.1 nicm 145: errno = EACCES;
1.160 nicm 146: goto fail;
1.1 nicm 147: }
1.160 nicm 148: xasprintf(&path, "%s/%s", resolved, label);
149: return (path);
1.113 nicm 150:
1.160 nicm 151: fail:
1.186 nicm 152: xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno));
1.160 nicm 153: return (NULL);
1.1 nicm 154: }
155:
1.101 nicm 156: void
157: setblocking(int fd, int state)
158: {
159: int mode;
160:
161: if ((mode = fcntl(fd, F_GETFL)) != -1) {
162: if (!state)
163: mode |= O_NONBLOCK;
164: else
165: mode &= ~O_NONBLOCK;
166: fcntl(fd, F_SETFL, mode);
167: }
168: }
169:
1.138 nicm 170: const char *
1.187 nicm 171: find_cwd(void)
172: {
173: char resolved1[PATH_MAX], resolved2[PATH_MAX];
174: static char cwd[PATH_MAX];
175: const char *pwd;
176:
177: if (getcwd(cwd, sizeof cwd) == NULL)
178: return (NULL);
179: if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
180: return (cwd);
181:
182: /*
183: * We want to use PWD so that symbolic links are maintained,
184: * but only if it matches the actual working directory.
185: */
186: if (realpath(pwd, resolved1) == NULL)
187: return (cwd);
188: if (realpath(cwd, resolved2) == NULL)
189: return (cwd);
190: if (strcmp(resolved1, resolved2) != 0)
191: return (cwd);
192: return (pwd);
193: }
194:
195: const char *
1.137 nicm 196: find_home(void)
197: {
1.142 nicm 198: struct passwd *pw;
199: static const char *home;
200:
201: if (home != NULL)
202: return (home);
1.137 nicm 203:
204: home = getenv("HOME");
205: if (home == NULL || *home == '\0') {
206: pw = getpwuid(getuid());
207: if (pw != NULL)
208: home = pw->pw_dir;
209: else
210: home = NULL;
211: }
212:
1.138 nicm 213: return (home);
1.137 nicm 214: }
215:
1.191 nicm 216: const char *
217: getversion(void)
218: {
219: static char *version;
220: struct utsname u;
221:
222: if (version == NULL) {
223: if (uname(&u) < 0)
224: fatalx("uname failed");
225: xasprintf(&version, "openbsd-%s", u.release);
226: }
227: return version;
228: }
229:
1.1 nicm 230: int
231: main(int argc, char **argv)
232: {
1.186 nicm 233: char *path, *label, *cause, **var;
1.185 nicm 234: const char *s, *shell, *cwd;
1.175 nicm 235: int opt, flags, keys;
236: const struct options_table_entry *oe;
1.165 nicm 237:
1.183 nicm 238: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
239: setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
1.168 nicm 240: if (setlocale(LC_CTYPE, "") == NULL)
241: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
242: s = nl_langinfo(CODESET);
1.169 nicm 243: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
1.168 nicm 244: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
245: }
1.167 nicm 246:
1.119 nicm 247: setlocale(LC_TIME, "");
1.144 nicm 248: tzset();
1.1 nicm 249:
1.140 nicm 250: if (**argv == '-')
251: flags = CLIENT_LOGIN;
252: else
253: flags = 0;
254:
1.92 nicm 255: label = path = NULL;
1.191 nicm 256: while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUvV")) != -1) {
1.41 nicm 257: switch (opt) {
1.1 nicm 258: case '2':
1.124 nicm 259: flags |= CLIENT_256COLOURS;
1.1 nicm 260: break;
1.46 nicm 261: case 'c':
1.184 nicm 262: shell_command = optarg;
1.111 nicm 263: break;
264: case 'C':
1.124 nicm 265: if (flags & CLIENT_CONTROL)
266: flags |= CLIENT_CONTROLCONTROL;
1.111 nicm 267: else
1.124 nicm 268: flags |= CLIENT_CONTROL;
1.37 nicm 269: break;
1.1 nicm 270: case 'f':
1.142 nicm 271: set_cfg_file(optarg);
1.41 nicm 272: break;
1.191 nicm 273: case 'V':
274: printf("%s %s\n", getprogname(), getversion());
275: exit(0);
1.41 nicm 276: case 'l':
1.140 nicm 277: flags |= CLIENT_LOGIN;
1.1 nicm 278: break;
279: case 'L':
1.112 nicm 280: free(label);
1.1 nicm 281: label = xstrdup(optarg);
282: break;
1.37 nicm 283: case 'q':
284: break;
1.1 nicm 285: case 'S':
1.112 nicm 286: free(path);
1.1 nicm 287: path = xstrdup(optarg);
288: break;
289: case 'u':
1.124 nicm 290: flags |= CLIENT_UTF8;
1.1 nicm 291: break;
292: case 'v':
1.157 nicm 293: log_add_level();
1.1 nicm 294: break;
1.53 deraadt 295: default:
1.1 nicm 296: usage();
1.53 deraadt 297: }
298: }
1.1 nicm 299: argc -= optind;
300: argv += optind;
301:
1.184 nicm 302: if (shell_command != NULL && argc != 0)
1.46 nicm 303: usage();
1.145 nicm 304:
1.181 nicm 305: if ((ptm_fd = getptmfd()) == -1)
306: err(1, "getptmfd");
1.156 nicm 307: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
308: "recvfd proc exec tty ps", NULL) != 0)
1.145 nicm 309: err(1, "pledge");
1.46 nicm 310:
1.152 nicm 311: /*
312: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
313: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
314: * UTF-8, it is a safe assumption that either they are using a UTF-8
315: * terminal, or if not they know that output from UTF-8-capable
316: * programs may be wrong.
317: */
318: if (getenv("TMUX") != NULL)
319: flags |= CLIENT_UTF8;
320: else {
321: s = getenv("LC_ALL");
322: if (s == NULL || *s == '\0')
323: s = getenv("LC_CTYPE");
324: if (s == NULL || *s == '\0')
325: s = getenv("LANG");
326: if (s == NULL || *s == '\0')
327: s = "";
328: if (strcasestr(s, "UTF-8") != NULL ||
329: strcasestr(s, "UTF8") != NULL)
1.124 nicm 330: flags |= CLIENT_UTF8;
1.15 nicm 331: }
332:
1.149 nicm 333: global_environ = environ_create();
1.62 nicm 334: for (var = environ; *var != NULL; var++)
1.149 nicm 335: environ_put(global_environ, *var);
1.187 nicm 336: if ((cwd = find_cwd()) != NULL)
1.185 nicm 337: environ_set(global_environ, "PWD", "%s", cwd);
1.63 nicm 338:
1.148 nicm 339: global_options = options_create(NULL);
340: global_s_options = options_create(NULL);
1.175 nicm 341: global_w_options = options_create(NULL);
342: for (oe = options_table; oe->name != NULL; oe++) {
1.189 nicm 343: if (oe->scope & OPTIONS_TABLE_SERVER)
1.175 nicm 344: options_default(global_options, oe);
1.189 nicm 345: if (oe->scope & OPTIONS_TABLE_SESSION)
1.175 nicm 346: options_default(global_s_options, oe);
1.189 nicm 347: if (oe->scope & OPTIONS_TABLE_WINDOW)
1.175 nicm 348: options_default(global_w_options, oe);
349: }
1.44 nicm 350:
1.175 nicm 351: /*
352: * The default shell comes from SHELL or from the user's passwd entry
353: * if available.
354: */
355: shell = getshell();
356: options_set_string(global_s_options, "default-shell", 0, "%s", shell);
1.94 nicm 357:
1.99 nicm 358: /* Override keys to vi if VISUAL or EDITOR are set. */
1.94 nicm 359: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
360: if (strrchr(s, '/') != NULL)
361: s = strrchr(s, '/') + 1;
362: if (strstr(s, "vi") != NULL)
363: keys = MODEKEY_VI;
1.99 nicm 364: else
365: keys = MODEKEY_EMACS;
1.148 nicm 366: options_set_number(global_s_options, "status-keys", keys);
367: options_set_number(global_w_options, "mode-keys", keys);
1.1 nicm 368: }
1.62 nicm 369:
1.68 nicm 370: /*
1.160 nicm 371: * If socket is specified on the command-line with -S or -L, it is
372: * used. Otherwise, $TMUX is checked and if that fails "default" is
373: * used.
1.68 nicm 374: */
1.160 nicm 375: if (path == NULL && label == NULL) {
376: s = getenv("TMUX");
377: if (s != NULL && *s != '\0' && *s != ',') {
378: path = xstrdup(s);
1.173 nicm 379: path[strcspn(path, ",")] = '\0';
1.68 nicm 380: }
1.1 nicm 381: }
1.186 nicm 382: if (path == NULL && (path = make_label(label, &cause)) == NULL) {
383: if (cause != NULL) {
384: fprintf(stderr, "%s\n", cause);
385: free(cause);
386: }
1.127 nicm 387: exit(1);
388: }
1.160 nicm 389: socket_path = path;
390: free(label);
1.1 nicm 391:
1.92 nicm 392: /* Pass control to the client. */
1.184 nicm 393: exit(client_main(event_init(), argc, argv, flags));
1.1 nicm 394: }
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