Annotation of src/usr.bin/tmux/tmux.c, Revision 1.188
1.188 ! nicm 1: /* $OpenBSD: tmux.c,v 1.187 2018/11/22 10:36:40 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;
1.1 nicm 42:
1.158 nicm 43: struct timeval start_time;
1.160 nicm 44: const char *socket_path;
1.176 nicm 45: int ptm_fd = -1;
1.184 nicm 46: const char *shell_command;
1.70 nicm 47:
1.171 nicm 48: static __dead void usage(void);
1.186 nicm 49: static char *make_label(const char *, char **);
1.55 nicm 50:
1.172 nicm 51: static const char *getshell(void);
52: static int checkshell(const char *);
53:
1.171 nicm 54: static __dead void
1.1 nicm 55: usage(void)
56: {
1.4 sobrado 57: fprintf(stderr,
1.136 jmc 58: "usage: %s [-2Cluv] [-c shell-command] [-f file] [-L socket-name]\n"
1.41 nicm 59: " [-S socket-path] [command [flags]]\n",
1.170 nicm 60: getprogname());
1.1 nicm 61: exit(1);
62: }
63:
1.172 nicm 64: static const char *
1.39 nicm 65: getshell(void)
66: {
67: struct passwd *pw;
68: const char *shell;
69:
70: shell = getenv("SHELL");
71: if (checkshell(shell))
72: return (shell);
73:
74: pw = getpwuid(getuid());
75: if (pw != NULL && checkshell(pw->pw_shell))
76: return (pw->pw_shell);
77:
78: return (_PATH_BSHELL);
79: }
80:
1.172 nicm 81: static int
1.39 nicm 82: checkshell(const char *shell)
83: {
1.177 nicm 84: if (shell == NULL || *shell != '/')
1.105 nicm 85: return (0);
86: if (areshell(shell))
1.39 nicm 87: return (0);
88: if (access(shell, X_OK) != 0)
89: return (0);
90: return (1);
91: }
92:
93: int
94: areshell(const char *shell)
95: {
96: const char *progname, *ptr;
97:
98: if ((ptr = strrchr(shell, '/')) != NULL)
99: ptr++;
100: else
101: ptr = shell;
1.170 nicm 102: progname = getprogname();
1.39 nicm 103: if (*progname == '-')
104: progname++;
105: if (strcmp(ptr, progname) == 0)
106: return (1);
107: return (0);
1.107 nicm 108: }
109:
1.160 nicm 110: static char *
1.186 nicm 111: make_label(const char *label, char **cause)
1.1 nicm 112: {
1.160 nicm 113: char *base, resolved[PATH_MAX], *path, *s;
114: struct stat sb;
1.178 nicm 115: uid_t uid;
1.186 nicm 116:
117: *cause = NULL;
1.160 nicm 118:
119: if (label == NULL)
120: label = "default";
1.1 nicm 121: uid = getuid();
1.160 nicm 122:
1.118 nicm 123: if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
1.180 nicm 124: xasprintf(&base, "%s/tmux-%ld", s, (long)uid);
1.118 nicm 125: else
1.178 nicm 126: xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid);
1.186 nicm 127: if (realpath(base, resolved) == NULL &&
128: strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) {
129: errno = ERANGE;
130: free(base);
131: goto fail;
132: }
1.1 nicm 133:
1.186 nicm 134: if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST)
1.160 nicm 135: goto fail;
1.186 nicm 136: if (lstat(resolved, &sb) != 0)
1.160 nicm 137: goto fail;
1.1 nicm 138: if (!S_ISDIR(sb.st_mode)) {
139: errno = ENOTDIR;
1.160 nicm 140: goto fail;
1.1 nicm 141: }
1.134 nicm 142: if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
1.1 nicm 143: errno = EACCES;
1.160 nicm 144: goto fail;
1.1 nicm 145: }
1.160 nicm 146: xasprintf(&path, "%s/%s", resolved, label);
147: return (path);
1.113 nicm 148:
1.160 nicm 149: fail:
1.186 nicm 150: xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno));
1.160 nicm 151: return (NULL);
1.1 nicm 152: }
153:
1.101 nicm 154: void
155: setblocking(int fd, int state)
156: {
157: int mode;
158:
159: if ((mode = fcntl(fd, F_GETFL)) != -1) {
160: if (!state)
161: mode |= O_NONBLOCK;
162: else
163: mode &= ~O_NONBLOCK;
164: fcntl(fd, F_SETFL, mode);
165: }
166: }
167:
1.138 nicm 168: const char *
1.187 nicm 169: find_cwd(void)
170: {
171: char resolved1[PATH_MAX], resolved2[PATH_MAX];
172: static char cwd[PATH_MAX];
173: const char *pwd;
174:
175: if (getcwd(cwd, sizeof cwd) == NULL)
176: return (NULL);
177: if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
178: return (cwd);
179:
180: /*
181: * We want to use PWD so that symbolic links are maintained,
182: * but only if it matches the actual working directory.
183: */
184: if (realpath(pwd, resolved1) == NULL)
185: return (cwd);
186: if (realpath(cwd, resolved2) == NULL)
187: return (cwd);
188: if (strcmp(resolved1, resolved2) != 0)
189: return (cwd);
190: return (pwd);
191: }
192:
193: const char *
1.137 nicm 194: find_home(void)
195: {
1.142 nicm 196: struct passwd *pw;
197: static const char *home;
198:
199: if (home != NULL)
200: return (home);
1.137 nicm 201:
202: home = getenv("HOME");
203: if (home == NULL || *home == '\0') {
204: pw = getpwuid(getuid());
205: if (pw != NULL)
206: home = pw->pw_dir;
207: else
208: home = NULL;
209: }
210:
1.138 nicm 211: return (home);
1.137 nicm 212: }
213:
1.1 nicm 214: int
215: main(int argc, char **argv)
216: {
1.186 nicm 217: char *path, *label, *cause, **var;
1.185 nicm 218: const char *s, *shell, *cwd;
1.175 nicm 219: int opt, flags, keys;
220: const struct options_table_entry *oe;
1.165 nicm 221:
1.183 nicm 222: if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
223: setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
1.168 nicm 224: if (setlocale(LC_CTYPE, "") == NULL)
225: errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
226: s = nl_langinfo(CODESET);
1.169 nicm 227: if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
1.168 nicm 228: errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
229: }
1.167 nicm 230:
1.119 nicm 231: setlocale(LC_TIME, "");
1.144 nicm 232: tzset();
1.1 nicm 233:
1.140 nicm 234: if (**argv == '-')
235: flags = CLIENT_LOGIN;
236: else
237: flags = 0;
238:
1.92 nicm 239: label = path = NULL;
1.117 nicm 240: while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUv")) != -1) {
1.41 nicm 241: switch (opt) {
1.1 nicm 242: case '2':
1.124 nicm 243: flags |= CLIENT_256COLOURS;
1.1 nicm 244: break;
1.46 nicm 245: case 'c':
1.184 nicm 246: shell_command = optarg;
1.111 nicm 247: break;
248: case 'C':
1.124 nicm 249: if (flags & CLIENT_CONTROL)
250: flags |= CLIENT_CONTROLCONTROL;
1.111 nicm 251: else
1.124 nicm 252: flags |= CLIENT_CONTROL;
1.37 nicm 253: break;
1.1 nicm 254: case 'f':
1.142 nicm 255: set_cfg_file(optarg);
1.41 nicm 256: break;
257: case 'l':
1.140 nicm 258: flags |= CLIENT_LOGIN;
1.1 nicm 259: break;
260: case 'L':
1.112 nicm 261: free(label);
1.1 nicm 262: label = xstrdup(optarg);
263: break;
1.37 nicm 264: case 'q':
265: break;
1.1 nicm 266: case 'S':
1.112 nicm 267: free(path);
1.1 nicm 268: path = xstrdup(optarg);
269: break;
270: case 'u':
1.124 nicm 271: flags |= CLIENT_UTF8;
1.1 nicm 272: break;
273: case 'v':
1.157 nicm 274: log_add_level();
1.1 nicm 275: break;
1.53 deraadt 276: default:
1.1 nicm 277: usage();
1.53 deraadt 278: }
279: }
1.1 nicm 280: argc -= optind;
281: argv += optind;
282:
1.184 nicm 283: if (shell_command != NULL && argc != 0)
1.46 nicm 284: usage();
1.145 nicm 285:
1.181 nicm 286: if ((ptm_fd = getptmfd()) == -1)
287: err(1, "getptmfd");
1.156 nicm 288: if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
289: "recvfd proc exec tty ps", NULL) != 0)
1.145 nicm 290: err(1, "pledge");
1.46 nicm 291:
1.152 nicm 292: /*
293: * tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
294: * Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
295: * UTF-8, it is a safe assumption that either they are using a UTF-8
296: * terminal, or if not they know that output from UTF-8-capable
297: * programs may be wrong.
298: */
299: if (getenv("TMUX") != NULL)
300: flags |= CLIENT_UTF8;
301: else {
302: s = getenv("LC_ALL");
303: if (s == NULL || *s == '\0')
304: s = getenv("LC_CTYPE");
305: if (s == NULL || *s == '\0')
306: s = getenv("LANG");
307: if (s == NULL || *s == '\0')
308: s = "";
309: if (strcasestr(s, "UTF-8") != NULL ||
310: strcasestr(s, "UTF8") != NULL)
1.124 nicm 311: flags |= CLIENT_UTF8;
1.15 nicm 312: }
313:
1.149 nicm 314: global_environ = environ_create();
1.62 nicm 315: for (var = environ; *var != NULL; var++)
1.149 nicm 316: environ_put(global_environ, *var);
1.187 nicm 317: if ((cwd = find_cwd()) != NULL)
1.185 nicm 318: environ_set(global_environ, "PWD", "%s", cwd);
1.63 nicm 319:
1.148 nicm 320: global_options = options_create(NULL);
321: global_s_options = options_create(NULL);
1.175 nicm 322: global_w_options = options_create(NULL);
323: for (oe = options_table; oe->name != NULL; oe++) {
324: if (oe->scope == OPTIONS_TABLE_SERVER)
325: options_default(global_options, oe);
326: if (oe->scope == OPTIONS_TABLE_SESSION)
327: options_default(global_s_options, oe);
328: if (oe->scope == OPTIONS_TABLE_WINDOW)
329: options_default(global_w_options, oe);
330: }
1.44 nicm 331:
1.175 nicm 332: /*
333: * The default shell comes from SHELL or from the user's passwd entry
334: * if available.
335: */
336: shell = getshell();
337: options_set_string(global_s_options, "default-shell", 0, "%s", shell);
1.94 nicm 338:
1.99 nicm 339: /* Override keys to vi if VISUAL or EDITOR are set. */
1.94 nicm 340: if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
341: if (strrchr(s, '/') != NULL)
342: s = strrchr(s, '/') + 1;
343: if (strstr(s, "vi") != NULL)
344: keys = MODEKEY_VI;
1.99 nicm 345: else
346: keys = MODEKEY_EMACS;
1.148 nicm 347: options_set_number(global_s_options, "status-keys", keys);
348: options_set_number(global_w_options, "mode-keys", keys);
1.1 nicm 349: }
1.62 nicm 350:
1.68 nicm 351: /*
1.160 nicm 352: * If socket is specified on the command-line with -S or -L, it is
353: * used. Otherwise, $TMUX is checked and if that fails "default" is
354: * used.
1.68 nicm 355: */
1.160 nicm 356: if (path == NULL && label == NULL) {
357: s = getenv("TMUX");
358: if (s != NULL && *s != '\0' && *s != ',') {
359: path = xstrdup(s);
1.173 nicm 360: path[strcspn(path, ",")] = '\0';
1.68 nicm 361: }
1.1 nicm 362: }
1.186 nicm 363: if (path == NULL && (path = make_label(label, &cause)) == NULL) {
364: if (cause != NULL) {
365: fprintf(stderr, "%s\n", cause);
366: free(cause);
367: }
1.127 nicm 368: exit(1);
369: }
1.160 nicm 370: socket_path = path;
371: free(label);
1.1 nicm 372:
1.92 nicm 373: /* Pass control to the client. */
1.184 nicm 374: exit(client_main(event_init(), argc, argv, flags));
1.1 nicm 375: }
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