Annotation of src/usr.bin/tmux/tmux.c, Revision 1.204
1.204 ! nicm 1: /* $OpenBSD: tmux.c,v 1.203 2020/09/22 05:23:34 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:
145: void
146: expand_paths(const char *s, char ***paths, u_int *n)
147: {
148: const char *home = find_home();
149: char *copy, *next, *tmp, resolved[PATH_MAX], *expanded;
150: u_int i;
151:
152: *paths = NULL;
153: *n = 0;
154:
155: copy = tmp = xstrdup(s);
156: while ((next = strsep(&tmp, ":")) != NULL) {
157: expanded = expand_path(next, home);
158: if (expanded == NULL) {
159: log_debug("%s: invalid path: %s", __func__, next);
160: continue;
161: }
162: if (realpath(expanded, resolved) == NULL) {
163: log_debug("%s: realpath(\"%s\") failed: %s", __func__,
164: expanded, strerror(errno));
165: free(expanded);
166: continue;
167: }
168: free(expanded);
169: for (i = 0; i < *n; i++) {
170: if (strcmp(resolved, (*paths)[i]) == 0)
171: break;
172: }
173: if (i != *n) {
174: log_debug("%s: duplicate path: %s", __func__, resolved);
175: continue;
176: }
177: *paths = xreallocarray(*paths, (*n) + 1, sizeof *paths);
178: (*paths)[(*n)++] = xstrdup(resolved);
179: }
180: free(copy);
181: }
182:
183: static char *
1.186 nicm 184: make_label(const char *label, char **cause)
1.1 nicm 185: {
1.199 nicm 186: char **paths, *path, *base;
187: u_int i, n;
188: struct stat sb;
189: uid_t uid;
1.186 nicm 190:
191: *cause = NULL;
1.160 nicm 192: if (label == NULL)
193: label = "default";
1.1 nicm 194: uid = getuid();
1.160 nicm 195:
1.199 nicm 196: expand_paths(TMUX_SOCK, &paths, &n);
197: if (n == 0) {
198: xasprintf(cause, "no suitable socket path");
199: return (NULL);
1.186 nicm 200: }
1.199 nicm 201: path = paths[0]; /* can only have one socket! */
202: for (i = 1; i < n; i++)
203: free(paths[i]);
204: free(paths);
1.1 nicm 205:
1.199 nicm 206: xasprintf(&base, "%s/tmux-%ld", path, (long)uid);
207: if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
1.160 nicm 208: goto fail;
1.199 nicm 209: if (lstat(base, &sb) != 0)
1.160 nicm 210: goto fail;
1.1 nicm 211: if (!S_ISDIR(sb.st_mode)) {
212: errno = ENOTDIR;
1.160 nicm 213: goto fail;
1.1 nicm 214: }
1.134 nicm 215: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
1.1 nicm 216: errno = EACCES;
1.160 nicm 217: goto fail;
1.1 nicm 218: }
1.199 nicm 219: xasprintf(&path, "%s/%s", base, label);
220: free(base);
1.160 nicm 221: return (path);
1.113 nicm 222:
1.160 nicm 223: fail:
1.199 nicm 224: xasprintf(cause, "error creating %s (%s)", base, strerror(errno));
225: free(base);
1.160 nicm 226: return (NULL);
1.1 nicm 227: }
228:
1.101 nicm 229: void
230: setblocking(int fd, int state)
231: {
232: int mode;
233:
234: if ((mode = fcntl(fd, F_GETFL)) != -1) {
235: if (!state)
236: mode |= O_NONBLOCK;
237: else
238: mode &= ~O_NONBLOCK;
239: fcntl(fd, F_SETFL, mode);
240: }
1.202 nicm 241: }
242:
243: uint64_t
244: get_timer(void)
245: {
246: struct timespec ts;
247:
248: /*
249: * We want a timestamp in milliseconds suitable for time measurement,
250: * so prefer the monotonic clock.
251: */
252: if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
253: clock_gettime(CLOCK_REALTIME, &ts);
254: return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
1.197 nicm 255: }
256:
257: const char *
258: sig2name(int signo)
259: {
260: static char s[11];
261:
262: if (signo > 0 && signo < NSIG)
263: return (sys_signame[signo]);
264: xsnprintf(s, sizeof s, "%d", signo);
265: return (s);
1.101 nicm 266: }
267:
1.138 nicm 268: const char *
1.187 nicm 269: find_cwd(void)
270: {
271: char resolved1[PATH_MAX], resolved2[PATH_MAX];
272: static char cwd[PATH_MAX];
273: const char *pwd;
274:
275: if (getcwd(cwd, sizeof cwd) == NULL)
276: return (NULL);
277: if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
278: return (cwd);
279:
280: /*
281: * We want to use PWD so that symbolic links are maintained,
282: * but only if it matches the actual working directory.
283: */
284: if (realpath(pwd, resolved1) == NULL)
285: return (cwd);
286: if (realpath(cwd, resolved2) == NULL)
287: return (cwd);
288: if (strcmp(resolved1, resolved2) != 0)
289: return (cwd);
290: return (pwd);
291: }
292:
293: const char *
1.137 nicm 294: find_home(void)
295: {
1.142 nicm 296: struct passwd *pw;
297: static const char *home;
298:
299: if (home != NULL)
300: return (home);
1.137 nicm 301:
302: home = getenv("HOME");
303: if (home == NULL || *home == '\0') {
304: pw = getpwuid(getuid());
305: if (pw != NULL)
306: home = pw->pw_dir;
307: else
308: home = NULL;
309: }
310:
1.138 nicm 311: return (home);
1.137 nicm 312: }
313:
1.191 nicm 314: const char *
315: getversion(void)
316: {
317: static char *version;
318: struct utsname u;
319:
320: if (version == NULL) {
321: if (uname(&u) < 0)
322: fatalx("uname failed");
323: xasprintf(&version, "openbsd-%s", u.release);
324: }
1.196 nicm 325: return (version);
1.191 nicm 326: }
327:
1.1 nicm 328: int
329: main(int argc, char **argv)
330: {
1.198 nicm 331: char *path = NULL, *label = NULL;
332: char *cause, **var;
1.185 nicm 333: const char *s, *shell, *cwd;
1.203 nicm 334: int opt, keys, feat = 0;
335: uint64_t flags = 0;
1.175 nicm 336: const struct options_table_entry *oe;
1.165 nicm 337:
1.183 nicm 338: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
339: setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
1.168 nicm 340: if (setlocale(LC_CTYPE, "") == NULL)
341: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
342: s = nl_langinfo(CODESET);
1.169 nicm 343: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
1.168 nicm 344: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
345: }
1.167 nicm 346:
1.119 nicm 347: setlocale(LC_TIME, "");
1.144 nicm 348: tzset();
1.1 nicm 349:
1.140 nicm 350: if (**argv == '-')
351: flags = CLIENT_LOGIN;
352:
1.204 ! nicm 353: while ((opt = getopt(argc, argv, "2c:CDdf:lL:NqS:T:uUvV")) != -1) {
1.41 nicm 354: switch (opt) {
1.1 nicm 355: case '2':
1.198 nicm 356: tty_add_features(&feat, "256", ":,");
1.1 nicm 357: break;
1.46 nicm 358: case 'c':
1.184 nicm 359: shell_command = optarg;
1.111 nicm 360: break;
1.201 nicm 361: case 'D':
362: flags |= CLIENT_NOFORK;
363: break;
1.111 nicm 364: case 'C':
1.124 nicm 365: if (flags & CLIENT_CONTROL)
366: flags |= CLIENT_CONTROLCONTROL;
1.111 nicm 367: else
1.124 nicm 368: flags |= CLIENT_CONTROL;
1.37 nicm 369: break;
1.1 nicm 370: case 'f':
1.142 nicm 371: set_cfg_file(optarg);
1.41 nicm 372: break;
1.191 nicm 373: case 'V':
374: printf("%s %s\n", getprogname(), getversion());
375: exit(0);
1.41 nicm 376: case 'l':
1.140 nicm 377: flags |= CLIENT_LOGIN;
1.1 nicm 378: break;
379: case 'L':
1.112 nicm 380: free(label);
1.1 nicm 381: label = xstrdup(optarg);
1.204 ! nicm 382: break;
! 383: case 'N':
! 384: flags |= CLIENT_NOSTARTSERVER;
1.1 nicm 385: break;
1.37 nicm 386: case 'q':
387: break;
1.1 nicm 388: case 'S':
1.112 nicm 389: free(path);
1.1 nicm 390: path = xstrdup(optarg);
391: break;
1.198 nicm 392: case 'T':
393: tty_add_features(&feat, optarg, ":,");
394: break;
1.1 nicm 395: case 'u':
1.124 nicm 396: flags |= CLIENT_UTF8;
1.1 nicm 397: break;
398: case 'v':
1.157 nicm 399: log_add_level();
1.1 nicm 400: break;
1.53 deraadt 401: default:
1.1 nicm 402: usage();
1.53 deraadt 403: }
404: }
1.1 nicm 405: argc -= optind;
406: argv += optind;
407:
1.184 nicm 408: if (shell_command != NULL && argc != 0)
1.201 nicm 409: usage();
410: if ((flags & CLIENT_NOFORK) && argc != 0)
1.46 nicm 411: usage();
1.145 nicm 412:
1.181 nicm 413: if ((ptm_fd = getptmfd()) == -1)
414: err(1, "getptmfd");
1.156 nicm 415: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
416: "recvfd proc exec tty ps", NULL) != 0)
1.145 nicm 417: err(1, "pledge");
1.46 nicm 418:
1.152 nicm 419: /*
420: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
421: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
422: * UTF-8, it is a safe assumption that either they are using a UTF-8
423: * terminal, or if not they know that output from UTF-8-capable
424: * programs may be wrong.
425: */
426: if (getenv("TMUX") != NULL)
427: flags |= CLIENT_UTF8;
428: else {
429: s = getenv("LC_ALL");
430: if (s == NULL || *s == '\0')
431: s = getenv("LC_CTYPE");
432: if (s == NULL || *s == '\0')
433: s = getenv("LANG");
434: if (s == NULL || *s == '\0')
435: s = "";
436: if (strcasestr(s, "UTF-8") != NULL ||
437: strcasestr(s, "UTF8") != NULL)
1.124 nicm 438: flags |= CLIENT_UTF8;
1.15 nicm 439: }
440:
1.149 nicm 441: global_environ = environ_create();
1.62 nicm 442: for (var = environ; *var != NULL; var++)
1.195 nicm 443: environ_put(global_environ, *var, 0);
1.187 nicm 444: if ((cwd = find_cwd()) != NULL)
1.195 nicm 445: environ_set(global_environ, "PWD", 0, "%s", cwd);
1.63 nicm 446:
1.148 nicm 447: global_options = options_create(NULL);
448: global_s_options = options_create(NULL);
1.175 nicm 449: global_w_options = options_create(NULL);
450: for (oe = options_table; oe->name != NULL; oe++) {
1.189 nicm 451: if (oe->scope & OPTIONS_TABLE_SERVER)
1.175 nicm 452: options_default(global_options, oe);
1.189 nicm 453: if (oe->scope & OPTIONS_TABLE_SESSION)
1.175 nicm 454: options_default(global_s_options, oe);
1.189 nicm 455: if (oe->scope & OPTIONS_TABLE_WINDOW)
1.175 nicm 456: options_default(global_w_options, oe);
457: }
1.44 nicm 458:
1.175 nicm 459: /*
460: * The default shell comes from SHELL or from the user's passwd entry
461: * if available.
462: */
463: shell = getshell();
464: options_set_string(global_s_options, "default-shell", 0, "%s", shell);
1.94 nicm 465:
1.99 nicm 466: /* Override keys to vi if VISUAL or EDITOR are set. */
1.94 nicm 467: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
1.200 nicm 468: options_set_string(global_options, "editor", 0, "%s", s);
1.94 nicm 469: if (strrchr(s, '/') != NULL)
470: s = strrchr(s, '/') + 1;
471: if (strstr(s, "vi") != NULL)
472: keys = MODEKEY_VI;
1.99 nicm 473: else
474: keys = MODEKEY_EMACS;
1.148 nicm 475: options_set_number(global_s_options, "status-keys", keys);
476: options_set_number(global_w_options, "mode-keys", keys);
1.1 nicm 477: }
1.62 nicm 478:
1.68 nicm 479: /*
1.160 nicm 480: * If socket is specified on the command-line with -S or -L, it is
481: * used. Otherwise, $TMUX is checked and if that fails "default" is
482: * used.
1.68 nicm 483: */
1.160 nicm 484: if (path == NULL && label == NULL) {
485: s = getenv("TMUX");
486: if (s != NULL && *s != '\0' && *s != ',') {
487: path = xstrdup(s);
1.173 nicm 488: path[strcspn(path, ",")] = '\0';
1.68 nicm 489: }
1.1 nicm 490: }
1.193 nicm 491: if (path == NULL) {
492: if ((path = make_label(label, &cause)) == NULL) {
493: if (cause != NULL) {
494: fprintf(stderr, "%s\n", cause);
495: free(cause);
496: }
497: exit(1);
1.186 nicm 498: }
1.193 nicm 499: flags |= CLIENT_DEFAULTSOCKET;
1.127 nicm 500: }
1.160 nicm 501: socket_path = path;
502: free(label);
1.1 nicm 503:
1.92 nicm 504: /* Pass control to the client. */
1.198 nicm 505: exit(client_main(event_init(), argc, argv, flags, feat));
1.1 nicm 506: }
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