Annotation of src/usr.bin/tmux/tmux.c, Revision 1.187
1.187 ! nicm 1: /* $OpenBSD: tmux.c,v 1.186 2018/01/12 10:22:02 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>
21:
1.145 nicm 22: #include <err.h>
1.1 nicm 23: #include <errno.h>
1.55 nicm 24: #include <event.h>
1.91 nicm 25: #include <fcntl.h>
1.168 nicm 26: #include <langinfo.h>
1.119 nicm 27: #include <locale.h>
1.1 nicm 28: #include <paths.h>
29: #include <pwd.h>
30: #include <stdlib.h>
31: #include <string.h>
1.147 nicm 32: #include <time.h>
1.1 nicm 33: #include <unistd.h>
1.181 nicm 34: #include <util.h>
1.1 nicm 35:
36: #include "tmux.h"
37:
1.148 nicm 38: struct options *global_options; /* server options */
39: struct options *global_s_options; /* session options */
40: struct options *global_w_options; /* window options */
1.149 nicm 41: struct environ *global_environ;
1.163 nicm 42: struct hooks *global_hooks;
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,
1.136 jmc 59: "usage: %s [-2Cluv] [-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: }
1.1 nicm 134:
1.186 nicm 135: if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST)
1.160 nicm 136: goto fail;
1.186 nicm 137: if (lstat(resolved, &sb) != 0)
1.160 nicm 138: goto fail;
1.1 nicm 139: if (!S_ISDIR(sb.st_mode)) {
140: errno = ENOTDIR;
1.160 nicm 141: goto fail;
1.1 nicm 142: }
1.134 nicm 143: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
1.1 nicm 144: errno = EACCES;
1.160 nicm 145: goto fail;
1.1 nicm 146: }
1.160 nicm 147: xasprintf(&path, "%s/%s", resolved, label);
148: return (path);
1.113 nicm 149:
1.160 nicm 150: fail:
1.186 nicm 151: xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno));
1.160 nicm 152: return (NULL);
1.1 nicm 153: }
154:
1.101 nicm 155: void
156: setblocking(int fd, int state)
157: {
158: int mode;
159:
160: if ((mode = fcntl(fd, F_GETFL)) != -1) {
161: if (!state)
162: mode |= O_NONBLOCK;
163: else
164: mode &= ~O_NONBLOCK;
165: fcntl(fd, F_SETFL, mode);
166: }
167: }
168:
1.138 nicm 169: const char *
1.187 ! nicm 170: find_cwd(void)
! 171: {
! 172: char resolved1[PATH_MAX], resolved2[PATH_MAX];
! 173: static char cwd[PATH_MAX];
! 174: const char *pwd;
! 175:
! 176: if (getcwd(cwd, sizeof cwd) == NULL)
! 177: return (NULL);
! 178: if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
! 179: return (cwd);
! 180:
! 181: /*
! 182: * We want to use PWD so that symbolic links are maintained,
! 183: * but only if it matches the actual working directory.
! 184: */
! 185: if (realpath(pwd, resolved1) == NULL)
! 186: return (cwd);
! 187: if (realpath(cwd, resolved2) == NULL)
! 188: return (cwd);
! 189: if (strcmp(resolved1, resolved2) != 0)
! 190: return (cwd);
! 191: return (pwd);
! 192: }
! 193:
! 194: const char *
1.137 nicm 195: find_home(void)
196: {
1.142 nicm 197: struct passwd *pw;
198: static const char *home;
199:
200: if (home != NULL)
201: return (home);
1.137 nicm 202:
203: home = getenv("HOME");
204: if (home == NULL || *home == '\0') {
205: pw = getpwuid(getuid());
206: if (pw != NULL)
207: home = pw->pw_dir;
208: else
209: home = NULL;
210: }
211:
1.138 nicm 212: return (home);
1.137 nicm 213: }
214:
1.1 nicm 215: int
216: main(int argc, char **argv)
217: {
1.186 nicm 218: char *path, *label, *cause, **var;
1.185 nicm 219: const char *s, *shell, *cwd;
1.175 nicm 220: int opt, flags, keys;
221: const struct options_table_entry *oe;
1.165 nicm 222:
1.183 nicm 223: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
224: setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
1.168 nicm 225: if (setlocale(LC_CTYPE, "") == NULL)
226: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
227: s = nl_langinfo(CODESET);
1.169 nicm 228: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
1.168 nicm 229: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
230: }
1.167 nicm 231:
1.119 nicm 232: setlocale(LC_TIME, "");
1.144 nicm 233: tzset();
1.1 nicm 234:
1.140 nicm 235: if (**argv == '-')
236: flags = CLIENT_LOGIN;
237: else
238: flags = 0;
239:
1.92 nicm 240: label = path = NULL;
1.117 nicm 241: while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
1.41 nicm 242: switch (opt) {
1.1 nicm 243: case '2':
1.124 nicm 244: flags |= CLIENT_256COLOURS;
1.1 nicm 245: break;
1.46 nicm 246: case 'c':
1.184 nicm 247: shell_command = optarg;
1.111 nicm 248: break;
249: case 'C':
1.124 nicm 250: if (flags & CLIENT_CONTROL)
251: flags |= CLIENT_CONTROLCONTROL;
1.111 nicm 252: else
1.124 nicm 253: flags |= CLIENT_CONTROL;
1.37 nicm 254: break;
1.1 nicm 255: case 'f':
1.142 nicm 256: set_cfg_file(optarg);
1.41 nicm 257: break;
258: case 'l':
1.140 nicm 259: flags |= CLIENT_LOGIN;
1.1 nicm 260: break;
261: case 'L':
1.112 nicm 262: free(label);
1.1 nicm 263: label = xstrdup(optarg);
264: break;
1.37 nicm 265: case 'q':
266: break;
1.1 nicm 267: case 'S':
1.112 nicm 268: free(path);
1.1 nicm 269: path = xstrdup(optarg);
270: break;
271: case 'u':
1.124 nicm 272: flags |= CLIENT_UTF8;
1.1 nicm 273: break;
274: case 'v':
1.157 nicm 275: log_add_level();
1.1 nicm 276: break;
1.53 deraadt 277: default:
1.1 nicm 278: usage();
1.53 deraadt 279: }
280: }
1.1 nicm 281: argc -= optind;
282: argv += optind;
283:
1.184 nicm 284: if (shell_command != NULL && argc != 0)
1.46 nicm 285: usage();
1.145 nicm 286:
1.181 nicm 287: if ((ptm_fd = getptmfd()) == -1)
288: err(1, "getptmfd");
1.156 nicm 289: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
290: "recvfd proc exec tty ps", NULL) != 0)
1.145 nicm 291: err(1, "pledge");
1.46 nicm 292:
1.152 nicm 293: /*
294: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
295: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
296: * UTF-8, it is a safe assumption that either they are using a UTF-8
297: * terminal, or if not they know that output from UTF-8-capable
298: * programs may be wrong.
299: */
300: if (getenv("TMUX") != NULL)
301: flags |= CLIENT_UTF8;
302: else {
303: s = getenv("LC_ALL");
304: if (s == NULL || *s == '\0')
305: s = getenv("LC_CTYPE");
306: if (s == NULL || *s == '\0')
307: s = getenv("LANG");
308: if (s == NULL || *s == '\0')
309: s = "";
310: if (strcasestr(s, "UTF-8") != NULL ||
311: strcasestr(s, "UTF8") != NULL)
1.124 nicm 312: flags |= CLIENT_UTF8;
1.15 nicm 313: }
1.163 nicm 314:
315: global_hooks = hooks_create(NULL);
1.15 nicm 316:
1.149 nicm 317: global_environ = environ_create();
1.62 nicm 318: for (var = environ; *var != NULL; var++)
1.149 nicm 319: environ_put(global_environ, *var);
1.187 ! nicm 320: if ((cwd = find_cwd()) != NULL)
1.185 nicm 321: environ_set(global_environ, "PWD", "%s", cwd);
1.63 nicm 322:
1.148 nicm 323: global_options = options_create(NULL);
324: global_s_options = options_create(NULL);
1.175 nicm 325: global_w_options = options_create(NULL);
326: for (oe = options_table; oe->name != NULL; oe++) {
327: if (oe->scope == OPTIONS_TABLE_SERVER)
328: options_default(global_options, oe);
329: if (oe->scope == OPTIONS_TABLE_SESSION)
330: options_default(global_s_options, oe);
331: if (oe->scope == OPTIONS_TABLE_WINDOW)
332: options_default(global_w_options, oe);
333: }
1.44 nicm 334:
1.175 nicm 335: /*
336: * The default shell comes from SHELL or from the user's passwd entry
337: * if available.
338: */
339: shell = getshell();
340: options_set_string(global_s_options, "default-shell", 0, "%s", shell);
1.94 nicm 341:
1.99 nicm 342: /* Override keys to vi if VISUAL or EDITOR are set. */
1.94 nicm 343: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
344: if (strrchr(s, '/') != NULL)
345: s = strrchr(s, '/') + 1;
346: if (strstr(s, "vi") != NULL)
347: keys = MODEKEY_VI;
1.99 nicm 348: else
349: keys = MODEKEY_EMACS;
1.148 nicm 350: options_set_number(global_s_options, "status-keys", keys);
351: options_set_number(global_w_options, "mode-keys", keys);
1.1 nicm 352: }
1.62 nicm 353:
1.68 nicm 354: /*
1.160 nicm 355: * If socket is specified on the command-line with -S or -L, it is
356: * used. Otherwise, $TMUX is checked and if that fails "default" is
357: * used.
1.68 nicm 358: */
1.160 nicm 359: if (path == NULL && label == NULL) {
360: s = getenv("TMUX");
361: if (s != NULL && *s != '\0' && *s != ',') {
362: path = xstrdup(s);
1.173 nicm 363: path[strcspn(path, ",")] = '\0';
1.68 nicm 364: }
1.1 nicm 365: }
1.186 nicm 366: if (path == NULL && (path = make_label(label, &cause)) == NULL) {
367: if (cause != NULL) {
368: fprintf(stderr, "%s\n", cause);
369: free(cause);
370: }
1.127 nicm 371: exit(1);
372: }
1.160 nicm 373: socket_path = path;
374: free(label);
1.1 nicm 375:
1.92 nicm 376: /* Pass control to the client. */
1.184 nicm 377: exit(client_main(event_init(), argc, argv, flags));
1.1 nicm 378: }
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