tmux.c

   1 /* $OpenBSD$ */
   2
   3 /*
   4  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
   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
  22 #include <errno.h>
  23 #include <event.h>
  24 #include <fcntl.h>
  25 #include <paths.h>
  26 #include <pwd.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include "tmux.h"
  32
  33 #ifdef DEBUG
  34 extern char     *malloc_options;
  35 #endif
  36
  37 struct options   global_options;        /* server options */
  38 struct options   global_s_options;      /* session options */
  39 struct options   global_w_options;      /* window options */
  40 struct environ   global_environ;
  41
  42 struct event_base *ev_base;
  43
  44 char            *cfg_file;
  45 char            *shell_cmd;
  46 int              debug_level;
  47 time_t           start_time;
  48 char             socket_path[MAXPATHLEN];
  49 int              login_shell;
  50 char            *environ_path;
  51 pid_t            environ_pid = -1;
  52 int              environ_idx = -1;
  53
  54 __dead void      usage(void);
  55 void             parseenvironment(void);
  56 char            *makesocketpath(const char *);
  57
  58 __dead void
  59 usage(void)
  60 {
  61         fprintf(stderr,
  62             "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
  63             "            [-S socket-path] [command [flags]]\n",
  64             __progname);
  65         exit(1);
  66 }
  67
  68 void
  69 logfile(const char *name)
  70 {
  71         char    *path;
  72
  73         log_close();
  74         if (debug_level > 0) {
  75                 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
  76                 log_open_file(debug_level, path);
  77                 xfree(path);
  78         }
  79 }
  80
  81 const char *
  82 getshell(void)
  83 {
  84         struct passwd   *pw;
  85         const char      *shell;
  86
  87         shell = getenv("SHELL");
  88         if (checkshell(shell))
  89                 return (shell);
  90
  91         pw = getpwuid(getuid());
  92         if (pw != NULL && checkshell(pw->pw_shell))
  93                 return (pw->pw_shell);
  94
  95         return (_PATH_BSHELL);
  96 }
  97
  98 int
  99 checkshell(const char *shell)
 100 {
 101         if (shell == NULL || *shell == '\0' || *shell != '/')
 102                 return (0);
 103         if (areshell(shell))
 104                 return (0);
 105         if (access(shell, X_OK) != 0)
 106                 return (0);
 107         return (1);
 108 }
 109
 110 int
 111 areshell(const char *shell)
 112 {
 113         const char      *progname, *ptr;
 114
 115         if ((ptr = strrchr(shell, '/')) != NULL)
 116                 ptr++;
 117         else
 118                 ptr = shell;
 119         progname = __progname;
 120         if (*progname == '-')
 121                 progname++;
 122         if (strcmp(ptr, progname) == 0)
 123                 return (1);
 124         return (0);
 125 }
 126
 127 const char*
 128 get_full_path(const char *wd, const char *path)
 129 {
 130         static char     newpath[MAXPATHLEN];
 131         char            oldpath[MAXPATHLEN];
 132
 133         if (getcwd(oldpath, sizeof oldpath) == NULL)
 134                 return (NULL);
 135         if (chdir(wd) != 0)
 136                 return (NULL);
 137         if (realpath(path, newpath) != 0)
 138                 return (NULL);
 139         chdir(oldpath);
 140         return (newpath);
 141 }
 142
 143 void
 144 parseenvironment(void)
 145 {
 146         char    *env, path[256];
 147         long     pid;
 148         int      idx;
 149
 150         if ((env = getenv("TMUX")) == NULL)
 151                 return;
 152
 153         if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &idx) != 3)
 154                 return;
 155         environ_path = xstrdup(path);
 156         environ_pid = pid;
 157         environ_idx = idx;
 158 }
 159
 160 char *
 161 makesocketpath(const char *label)
 162 {
 163         char            base[MAXPATHLEN], *path, *s;
 164         struct stat     sb;
 165         u_int           uid;
 166
 167         uid = getuid();
 168         if ((s = getenv("TMPDIR")) == NULL || *s == '\0')
 169                 xsnprintf(base, sizeof base, "%s/tmux-%u", _PATH_TMP, uid);
 170         else
 171                 xsnprintf(base, sizeof base, "%s/tmux-%u", s, uid);
 172
 173         if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
 174                 return (NULL);
 175
 176         if (lstat(base, &sb) != 0)
 177                 return (NULL);
 178         if (!S_ISDIR(sb.st_mode)) {
 179                 errno = ENOTDIR;
 180                 return (NULL);
 181         }
 182         if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
 183                 errno = EACCES;
 184                 return (NULL);
 185         }
 186
 187         xasprintf(&path, "%s/%s", base, label);
 188         return (path);
 189 }
 190
 191 void
 192 setblocking(int fd, int state)
 193 {
 194         int mode;
 195
 196         if ((mode = fcntl(fd, F_GETFL)) != -1) {
 197                 if (!state)
 198                         mode |= O_NONBLOCK;
 199                 else
 200                         mode &= ~O_NONBLOCK;
 201                 fcntl(fd, F_SETFL, mode);
 202         }
 203 }
 204
 205 __dead void
 206 shell_exec(const char *shell, const char *shellcmd)
 207 {
 208         const char      *shellname, *ptr;
 209         char            *argv0;
 210
 211         ptr = strrchr(shell, '/');
 212         if (ptr != NULL && *(ptr + 1) != '\0')
 213                 shellname = ptr + 1;
 214         else
 215                 shellname = shell;
 216         if (login_shell)
 217                 xasprintf(&argv0, "-%s", shellname);
 218         else
 219                 xasprintf(&argv0, "%s", shellname);
 220         setenv("SHELL", shell, 1);
 221
 222         setblocking(STDIN_FILENO, 1);
 223         setblocking(STDOUT_FILENO, 1);
 224         setblocking(STDERR_FILENO, 1);
 225         closefrom(STDERR_FILENO + 1);
 226
 227         execl(shell, argv0, "-c", shellcmd, (char *) NULL);
 228         fatal("execl failed");
 229 }
 230
 231 int
 232 main(int argc, char **argv)
 233 {
 234         struct passwd   *pw;
 235         char            *s, *path, *label, *home, **var;
 236         int              opt, flags, quiet, keys;
 237
 238 #ifdef DEBUG
 239         malloc_options = (char *) "AFGJPX";
 240 #endif
 241
 242         quiet = flags = 0;
 243         label = path = NULL;
 244         login_shell = (**argv == '-');
 245         while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
 246                 switch (opt) {
 247                 case '2':
 248                         flags |= IDENTIFY_256COLOURS;
 249                         flags &= ~IDENTIFY_88COLOURS;
 250                         break;
 251                 case '8':
 252                         flags |= IDENTIFY_88COLOURS;
 253                         flags &= ~IDENTIFY_256COLOURS;
 254                         break;
 255                 case 'c':
 256                         if (shell_cmd != NULL)
 257                                 xfree(shell_cmd);
 258                         shell_cmd = xstrdup(optarg);
 259                         break;
 260                 case 'f':
 261                         if (cfg_file != NULL)
 262                                 xfree(cfg_file);
 263                         cfg_file = xstrdup(optarg);
 264                         break;
 265                 case 'l':
 266                         login_shell = 1;
 267                         break;
 268                 case 'L':
 269                         if (label != NULL)
 270                                 xfree(label);
 271                         label = xstrdup(optarg);
 272                         break;
 273                 case 'q':
 274                         quiet = 1;
 275                         break;
 276                 case 'S':
 277                         if (path != NULL)
 278                                 xfree(path);
 279                         path = xstrdup(optarg);
 280                         break;
 281                 case 'u':
 282                         flags |= IDENTIFY_UTF8;
 283                         break;
 284                 case 'v':
 285                         debug_level++;
 286                         break;
 287                 default:
 288                         usage();
 289                 }
 290         }
 291         argc -= optind;
 292         argv += optind;
 293
 294         if (shell_cmd != NULL && argc != 0)
 295                 usage();
 296
 297         log_open_tty(debug_level);
 298
 299         if (!(flags & IDENTIFY_UTF8)) {
 300                 /*
 301                  * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
 302                  * exist (in that order) to contain UTF-8, it is a safe
 303                  * assumption that either they are using a UTF-8 terminal, or
 304                  * if not they know that output from UTF-8-capable programs may
 305                  * be wrong.
 306                  */
 307                 if ((s = getenv("LC_ALL")) == NULL || *s == '\0') {
 308                         if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
 309                                 s = getenv("LANG");
 310                 }
 311                 if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
 312                     strcasestr(s, "UTF8") != NULL))
 313                         flags |= IDENTIFY_UTF8;
 314         }
 315
 316         environ_init(&global_environ);
 317         for (var = environ; *var != NULL; var++)
 318                 environ_put(&global_environ, *var);
 319
 320         options_init(&global_options, NULL);
 321         options_table_populate_tree(server_options_table, &global_options);
 322         options_set_number(&global_options, "quiet", quiet);
 323
 324         options_init(&global_s_options, NULL);
 325         options_table_populate_tree(session_options_table, &global_s_options);
 326         options_set_string(&global_s_options, "default-shell", "%s", getshell());
 327
 328         options_init(&global_w_options, NULL);
 329         options_table_populate_tree(window_options_table, &global_w_options);
 330
 331         /* Enable UTF-8 if the first client is on UTF-8 terminal. */
 332         if (flags & IDENTIFY_UTF8) {
 333                 options_set_number(&global_s_options, "status-utf8", 1);
 334                 options_set_number(&global_s_options, "mouse-utf8", 1);
 335                 options_set_number(&global_w_options, "utf8", 1);
 336         }
 337
 338         /* Override keys to vi if VISUAL or EDITOR are set. */
 339         if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
 340                 if (strrchr(s, '/') != NULL)
 341                         s = strrchr(s, '/') + 1;
 342                 if (strstr(s, "vi") != NULL)
 343                         keys = MODEKEY_VI;
 344                 else
 345                         keys = MODEKEY_EMACS;
 346                 options_set_number(&global_s_options, "status-keys", keys);
 347                 options_set_number(&global_w_options, "mode-keys", keys);
 348         }
 349
 350         /* Locate the configuration file. */
 351         if (cfg_file == NULL) {
 352                 home = getenv("HOME");
 353                 if (home == NULL || *home == '\0') {
 354                         pw = getpwuid(getuid());
 355                         if (pw != NULL)
 356                                 home = pw->pw_dir;
 357                 }
 358                 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
 359                 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
 360                         xfree(cfg_file);
 361                         cfg_file = NULL;
 362                 }
 363         }
 364
 365         /*
 366          * Figure out the socket path. If specified on the command-line with -S
 367          * or -L, use it, otherwise try $TMUX or assume -L default.
 368          */
 369         parseenvironment();
 370         if (path == NULL) {
 371                 /* If no -L, use the environment. */
 372                 if (label == NULL) {
 373                         if (environ_path != NULL)
 374                                 path = xstrdup(environ_path);
 375                         else
 376                                 label = xstrdup("default");
 377                 }
 378
 379                 /* -L or default set. */
 380                 if (label != NULL) {
 381                         if ((path = makesocketpath(label)) == NULL) {
 382                                 log_warn("can't create socket");
 383                                 exit(1);
 384                         }
 385                 }
 386         }
 387         if (label != NULL)
 388                 xfree(label);
 389         if (realpath(path, socket_path) == NULL)
 390                 strlcpy(socket_path, path, sizeof socket_path);
 391         xfree(path);
 392
 393         /* Set process title. */
 394         setproctitle("%s (%s)", __progname, socket_path);
 395
 396         /* Pass control to the client. */
 397         ev_base = event_init();
 398         exit(client_main(argc, argv, flags));
 399 }