Annotation of src/usr.bin/tmux/tmux.c, Revision 1.208
1.208 ! nicm 1: /* $OpenBSD: tmux.c,v 1.207 2021/06/10 07:52:29 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>
1.197 nicm 31: #include <signal.h>
1.1 nicm 32: #include <stdlib.h>
33: #include <string.h>
1.147 nicm 34: #include <time.h>
1.1 nicm 35: #include <unistd.h>
1.181 nicm 36: #include <util.h>
1.1 nicm 37:
38: #include "tmux.h"
39:
1.148 nicm 40: struct options *global_options; /* server options */
41: struct options *global_s_options; /* session options */
42: struct options *global_w_options; /* window options */
1.149 nicm 43: struct environ *global_environ;
1.1 nicm 44:
1.158 nicm 45: struct timeval start_time;
1.160 nicm 46: const char *socket_path;
1.176 nicm 47: int ptm_fd = -1;
1.184 nicm 48: const char *shell_command;
1.70 nicm 49:
1.171 nicm 50: static __dead void usage(void);
1.186 nicm 51: static char *make_label(const char *, char **);
1.55 nicm 52:
1.194 nicm 53: static int areshell(const char *);
1.172 nicm 54: static const char *getshell(void);
55:
1.171 nicm 56: static __dead void
1.1 nicm 57: usage(void)
58: {
1.4 sobrado 59: fprintf(stderr,
1.204 nicm 60: "usage: %s [-2CDlNuvV] [-c shell-command] [-f file] [-L socket-name]\n"
1.198 nicm 61: " [-S socket-path] [-T features] [command [flags]]\n",
1.170 nicm 62: getprogname());
1.1 nicm 63: exit(1);
64: }
65:
1.172 nicm 66: static const char *
1.39 nicm 67: getshell(void)
68: {
69: struct passwd *pw;
70: const char *shell;
71:
72: shell = getenv("SHELL");
73: if (checkshell(shell))
74: return (shell);
75:
76: pw = getpwuid(getuid());
77: if (pw != NULL && checkshell(pw->pw_shell))
78: return (pw->pw_shell);
79:
80: return (_PATH_BSHELL);
81: }
82:
1.194 nicm 83: int
1.39 nicm 84: checkshell(const char *shell)
85: {
1.177 nicm 86: if (shell == NULL || *shell != '/')
1.105 nicm 87: return (0);
88: if (areshell(shell))
1.39 nicm 89: return (0);
90: if (access(shell, X_OK) != 0)
91: return (0);
92: return (1);
93: }
94:
1.194 nicm 95: static int
1.39 nicm 96: areshell(const char *shell)
97: {
98: const char *progname, *ptr;
99:
100: if ((ptr = strrchr(shell, '/')) != NULL)
101: ptr++;
102: else
103: ptr = shell;
1.170 nicm 104: progname = getprogname();
1.39 nicm 105: if (*progname == '-')
106: progname++;
107: if (strcmp(ptr, progname) == 0)
108: return (1);
109: return (0);
1.107 nicm 110: }
111:
1.160 nicm 112: static char *
1.199 nicm 113: expand_path(const char *path, const char *home)
114: {
115: char *expanded, *name;
116: const char *end;
117: struct environ_entry *value;
118:
119: if (strncmp(path, "~/", 2) == 0) {
120: if (home == NULL)
121: return (NULL);
122: xasprintf(&expanded, "%s%s", home, path + 1);
123: return (expanded);
124: }
125:
126: if (*path == '$') {
127: end = strchr(path, '/');
128: if (end == NULL)
129: name = xstrdup(path + 1);
130: else
131: name = xstrndup(path + 1, end - path - 1);
132: value = environ_find(global_environ, name);
133: free(name);
134: if (value == NULL)
135: return (NULL);
136: if (end == NULL)
137: end = "";
138: xasprintf(&expanded, "%s%s", value->value, end);
139: return (expanded);
140: }
141:
142: return (xstrdup(path));
143: }
144:
1.205 nicm 145: static void
146: expand_paths(const char *s, char ***paths, u_int *n, int ignore_errors)
1.199 nicm 147: {
148: const char *home = find_home();
149: char *copy, *next, *tmp, resolved[PATH_MAX], *expanded;
1.205 nicm 150: char *path;
1.199 nicm 151: u_int i;
152:
153: *paths = NULL;
154: *n = 0;
155:
156: copy = tmp = xstrdup(s);
157: while ((next = strsep(&tmp, ":")) != NULL) {
158: expanded = expand_path(next, home);
159: if (expanded == NULL) {
160: log_debug("%s: invalid path: %s", __func__, next);
161: continue;
162: }
163: if (realpath(expanded, resolved) == NULL) {
164: log_debug("%s: realpath(\"%s\") failed: %s", __func__,
165: expanded, strerror(errno));
1.205 nicm 166: if (ignore_errors) {
167: free(expanded);
168: continue;
169: }
170: path = expanded;
171: } else {
172: path = xstrdup(resolved);
1.199 nicm 173: free(expanded);
174: }
175: for (i = 0; i < *n; i++) {
1.205 nicm 176: if (strcmp(path, (*paths)[i]) == 0)
1.199 nicm 177: break;
178: }
179: if (i != *n) {
1.205 nicm 180: log_debug("%s: duplicate path: %s", __func__, path);
181: free(path);
1.199 nicm 182: continue;
183: }
184: *paths = xreallocarray(*paths, (*n) + 1, sizeof *paths);
1.205 nicm 185: (*paths)[(*n)++] = path;
1.199 nicm 186: }
187: free(copy);
188: }
189:
190: static char *
1.186 nicm 191: make_label(const char *label, char **cause)
1.1 nicm 192: {
1.199 nicm 193: char **paths, *path, *base;
194: u_int i, n;
195: struct stat sb;
196: uid_t uid;
1.186 nicm 197:
198: *cause = NULL;
1.160 nicm 199: if (label == NULL)
200: label = "default";
1.1 nicm 201: uid = getuid();
1.160 nicm 202:
1.205 nicm 203: expand_paths(TMUX_SOCK, &paths, &n, 1);
1.199 nicm 204: if (n == 0) {
205: xasprintf(cause, "no suitable socket path");
206: return (NULL);
1.186 nicm 207: }
1.199 nicm 208: path = paths[0]; /* can only have one socket! */
209: for (i = 1; i < n; i++)
210: free(paths[i]);
211: free(paths);
1.1 nicm 212:
1.199 nicm 213: xasprintf(&base, "%s/tmux-%ld", path, (long)uid);
1.208 ! nicm 214: if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) {
! 215: xasprintf(cause, "couldn't create directory %s (%s)", base,
! 216: strerror(errno));
1.160 nicm 217: goto fail;
1.208 ! nicm 218: }
! 219: if (lstat(base, &sb) != 0) {
! 220: xasprintf(cause, "couldn't read directory %s (%s)", base,
! 221: strerror(errno));
1.160 nicm 222: goto fail;
1.208 ! nicm 223: }
1.1 nicm 224: if (!S_ISDIR(sb.st_mode)) {
1.208 ! nicm 225: xasprintf(cause, "%s is not a directory", base);
1.160 nicm 226: goto fail;
1.1 nicm 227: }
1.134 nicm 228: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
1.208 ! nicm 229: xasprintf(cause, "directory %s has unsafe permissions", base);
1.160 nicm 230: goto fail;
1.1 nicm 231: }
1.199 nicm 232: xasprintf(&path, "%s/%s", base, label);
233: free(base);
1.160 nicm 234: return (path);
1.113 nicm 235:
1.160 nicm 236: fail:
1.199 nicm 237: free(base);
1.160 nicm 238: return (NULL);
1.1 nicm 239: }
240:
1.101 nicm 241: void
242: setblocking(int fd, int state)
243: {
244: int mode;
245:
246: if ((mode = fcntl(fd, F_GETFL)) != -1) {
247: if (!state)
248: mode |= O_NONBLOCK;
249: else
250: mode &= ~O_NONBLOCK;
251: fcntl(fd, F_SETFL, mode);
252: }
1.202 nicm 253: }
254:
255: uint64_t
256: get_timer(void)
257: {
258: struct timespec ts;
259:
260: /*
261: * We want a timestamp in milliseconds suitable for time measurement,
262: * so prefer the monotonic clock.
263: */
264: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
265: clock_gettime(CLOCK_REALTIME, &ts);
266: return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
1.197 nicm 267: }
268:
269: const char *
270: sig2name(int signo)
271: {
272: static char s[11];
273:
274: if (signo > 0 && signo < NSIG)
275: return (sys_signame[signo]);
276: xsnprintf(s, sizeof s, "%d", signo);
277: return (s);
1.101 nicm 278: }
279:
1.138 nicm 280: const char *
1.187 nicm 281: find_cwd(void)
282: {
283: char resolved1[PATH_MAX], resolved2[PATH_MAX];
284: static char cwd[PATH_MAX];
285: const char *pwd;
286:
287: if (getcwd(cwd, sizeof cwd) == NULL)
288: return (NULL);
289: if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
290: return (cwd);
291:
292: /*
293: * We want to use PWD so that symbolic links are maintained,
294: * but only if it matches the actual working directory.
295: */
296: if (realpath(pwd, resolved1) == NULL)
297: return (cwd);
298: if (realpath(cwd, resolved2) == NULL)
299: return (cwd);
300: if (strcmp(resolved1, resolved2) != 0)
301: return (cwd);
302: return (pwd);
303: }
304:
305: const char *
1.137 nicm 306: find_home(void)
307: {
1.142 nicm 308: struct passwd *pw;
309: static const char *home;
310:
311: if (home != NULL)
312: return (home);
1.137 nicm 313:
314: home = getenv("HOME");
315: if (home == NULL || *home == '\0') {
316: pw = getpwuid(getuid());
317: if (pw != NULL)
318: home = pw->pw_dir;
319: else
320: home = NULL;
321: }
322:
1.138 nicm 323: return (home);
1.137 nicm 324: }
325:
1.191 nicm 326: const char *
327: getversion(void)
328: {
329: static char *version;
330: struct utsname u;
331:
332: if (version == NULL) {
333: if (uname(&u) < 0)
334: fatalx("uname failed");
335: xasprintf(&version, "openbsd-%s", u.release);
336: }
1.196 nicm 337: return (version);
1.191 nicm 338: }
339:
1.1 nicm 340: int
341: main(int argc, char **argv)
342: {
1.198 nicm 343: char *path = NULL, *label = NULL;
344: char *cause, **var;
1.205 nicm 345: const char *s, *cwd;
1.207 nicm 346: int opt, keys, feat = 0, fflag = 0;
1.203 nicm 347: uint64_t flags = 0;
1.175 nicm 348: const struct options_table_entry *oe;
1.205 nicm 349: u_int i;
1.165 nicm 350:
1.183 nicm 351: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
352: setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
1.168 nicm 353: if (setlocale(LC_CTYPE, "") == NULL)
354: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
355: s = nl_langinfo(CODESET);
1.169 nicm 356: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
1.168 nicm 357: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
358: }
1.167 nicm 359:
1.119 nicm 360: setlocale(LC_TIME, "");
1.144 nicm 361: tzset();
1.1 nicm 362:
1.140 nicm 363: if (**argv == '-')
364: flags = CLIENT_LOGIN;
1.206 nicm 365:
366: global_environ = environ_create();
367: for (var = environ; *var != NULL; var++)
368: environ_put(global_environ, *var, 0);
369: if ((cwd = find_cwd()) != NULL)
370: environ_set(global_environ, "PWD", 0, "%s", cwd);
1.205 nicm 371: expand_paths(TMUX_CONF, &cfg_files, &cfg_nfiles, 1);
1.140 nicm 372:
1.204 nicm 373: while ((opt = getopt(argc, argv, "2c:CDdf:lL:NqS:T:uUvV")) != -1) {
1.41 nicm 374: switch (opt) {
1.1 nicm 375: case '2':
1.198 nicm 376: tty_add_features(&feat, "256", ":,");
1.1 nicm 377: break;
1.46 nicm 378: case 'c':
1.184 nicm 379: shell_command = optarg;
1.111 nicm 380: break;
1.201 nicm 381: case 'D':
382: flags |= CLIENT_NOFORK;
383: break;
1.111 nicm 384: case 'C':
1.124 nicm 385: if (flags & CLIENT_CONTROL)
386: flags |= CLIENT_CONTROLCONTROL;
1.111 nicm 387: else
1.124 nicm 388: flags |= CLIENT_CONTROL;
1.37 nicm 389: break;
1.1 nicm 390: case 'f':
1.207 nicm 391: if (!fflag) {
392: fflag = 1;
393: for (i = 0; i < cfg_nfiles; i++)
394: free(cfg_files[i]);
395: cfg_nfiles = 0;
396: }
397: cfg_files = xreallocarray(cfg_files, cfg_nfiles + 1,
398: sizeof *cfg_files);
399: cfg_files[cfg_nfiles++] = xstrdup(optarg);
1.205 nicm 400: cfg_quiet = 0;
1.41 nicm 401: break;
1.191 nicm 402: case 'V':
403: printf("%s %s\n", getprogname(), getversion());
404: exit(0);
1.41 nicm 405: case 'l':
1.140 nicm 406: flags |= CLIENT_LOGIN;
1.1 nicm 407: break;
408: case 'L':
1.112 nicm 409: free(label);
1.1 nicm 410: label = xstrdup(optarg);
1.204 nicm 411: break;
412: case 'N':
413: flags |= CLIENT_NOSTARTSERVER;
1.1 nicm 414: break;
1.37 nicm 415: case 'q':
416: break;
1.1 nicm 417: case 'S':
1.112 nicm 418: free(path);
1.1 nicm 419: path = xstrdup(optarg);
420: break;
1.198 nicm 421: case 'T':
422: tty_add_features(&feat, optarg, ":,");
423: break;
1.1 nicm 424: case 'u':
1.124 nicm 425: flags |= CLIENT_UTF8;
1.1 nicm 426: break;
427: case 'v':
1.157 nicm 428: log_add_level();
1.1 nicm 429: break;
1.53 deraadt 430: default:
1.1 nicm 431: usage();
1.53 deraadt 432: }
433: }
1.1 nicm 434: argc -= optind;
435: argv += optind;
436:
1.184 nicm 437: if (shell_command != NULL && argc != 0)
1.201 nicm 438: usage();
439: if ((flags & CLIENT_NOFORK) && argc != 0)
1.46 nicm 440: usage();
1.145 nicm 441:
1.181 nicm 442: if ((ptm_fd = getptmfd()) == -1)
443: err(1, "getptmfd");
1.156 nicm 444: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
445: "recvfd proc exec tty ps", NULL) != 0)
1.145 nicm 446: err(1, "pledge");
1.46 nicm 447:
1.152 nicm 448: /*
449: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
450: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
451: * UTF-8, it is a safe assumption that either they are using a UTF-8
452: * terminal, or if not they know that output from UTF-8-capable
453: * programs may be wrong.
454: */
455: if (getenv("TMUX") != NULL)
456: flags |= CLIENT_UTF8;
457: else {
458: s = getenv("LC_ALL");
459: if (s == NULL || *s == '\0')
460: s = getenv("LC_CTYPE");
461: if (s == NULL || *s == '\0')
462: s = getenv("LANG");
463: if (s == NULL || *s == '\0')
464: s = "";
465: if (strcasestr(s, "UTF-8") != NULL ||
466: strcasestr(s, "UTF8") != NULL)
1.124 nicm 467: flags |= CLIENT_UTF8;
1.15 nicm 468: }
1.63 nicm 469:
1.148 nicm 470: global_options = options_create(NULL);
471: global_s_options = options_create(NULL);
1.175 nicm 472: global_w_options = options_create(NULL);
473: for (oe = options_table; oe->name != NULL; oe++) {
1.189 nicm 474: if (oe->scope & OPTIONS_TABLE_SERVER)
1.175 nicm 475: options_default(global_options, oe);
1.189 nicm 476: if (oe->scope & OPTIONS_TABLE_SESSION)
1.175 nicm 477: options_default(global_s_options, oe);
1.189 nicm 478: if (oe->scope & OPTIONS_TABLE_WINDOW)
1.175 nicm 479: options_default(global_w_options, oe);
480: }
1.44 nicm 481:
1.175 nicm 482: /*
483: * The default shell comes from SHELL or from the user's passwd entry
484: * if available.
485: */
1.205 nicm 486: options_set_string(global_s_options, "default-shell", 0, "%s",
487: getshell());
1.94 nicm 488:
1.99 nicm 489: /* Override keys to vi if VISUAL or EDITOR are set. */
1.94 nicm 490: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
1.200 nicm 491: options_set_string(global_options, "editor", 0, "%s", s);
1.94 nicm 492: if (strrchr(s, '/') != NULL)
493: s = strrchr(s, '/') + 1;
494: if (strstr(s, "vi") != NULL)
495: keys = MODEKEY_VI;
1.99 nicm 496: else
497: keys = MODEKEY_EMACS;
1.148 nicm 498: options_set_number(global_s_options, "status-keys", keys);
499: options_set_number(global_w_options, "mode-keys", keys);
1.1 nicm 500: }
1.62 nicm 501:
1.68 nicm 502: /*
1.160 nicm 503: * If socket is specified on the command-line with -S or -L, it is
504: * used. Otherwise, $TMUX is checked and if that fails "default" is
505: * used.
1.68 nicm 506: */
1.160 nicm 507: if (path == NULL && label == NULL) {
508: s = getenv("TMUX");
509: if (s != NULL && *s != '\0' && *s != ',') {
510: path = xstrdup(s);
1.173 nicm 511: path[strcspn(path, ",")] = '\0';
1.68 nicm 512: }
1.1 nicm 513: }
1.193 nicm 514: if (path == NULL) {
515: if ((path = make_label(label, &cause)) == NULL) {
516: if (cause != NULL) {
517: fprintf(stderr, "%s\n", cause);
518: free(cause);
519: }
520: exit(1);
1.186 nicm 521: }
1.193 nicm 522: flags |= CLIENT_DEFAULTSOCKET;
1.127 nicm 523: }
1.160 nicm 524: socket_path = path;
525: free(label);
1.1 nicm 526:
1.92 nicm 527: /* Pass control to the client. */
1.198 nicm 528: exit(client_main(event_init(), argc, argv, flags, feat));
1.1 nicm 529: }
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