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Annotation of src/usr.bin/tmux/tmux.c, Revision 1.108

1.108   ! nicm        1: /* $OpenBSD: tmux.c,v 1.107 2011/10/23 08:34:01 nicm Exp $ */
1.1       nicm        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>
1.55      nicm       23: #include <event.h>
1.91      nicm       24: #include <fcntl.h>
1.1       nicm       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
1.54      nicm       34: extern char    *malloc_options;
1.1       nicm       35: #endif
                     36:
1.63      nicm       37: struct options  global_options;        /* server options */
1.12      nicm       38: struct options  global_s_options;      /* session options */
                     39: struct options  global_w_options;      /* window options */
1.29      nicm       40: struct environ  global_environ;
1.1       nicm       41:
1.78      nicm       42: struct event_base *ev_base;
                     43:
1.92      nicm       44: char           *cfg_file;
                     45: char           *shell_cmd;
1.1       nicm       46: int             debug_level;
                     47: time_t          start_time;
1.92      nicm       48: char            socket_path[MAXPATHLEN];
1.41      nicm       49: int             login_shell;
1.92      nicm       50: char           *environ_path;
1.103     nicm       51: pid_t           environ_pid = -1;
                     52: int             environ_idx = -1;
1.70      nicm       53:
1.1       nicm       54: __dead void     usage(void);
1.92      nicm       55: void            parseenvironment(void);
                     56: char           *makesocketpath(const char *);
1.55      nicm       57:
1.1       nicm       58: __dead void
                     59: usage(void)
                     60: {
1.4       sobrado    61:        fprintf(stderr,
1.52      nicm       62:            "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
1.41      nicm       63:            "            [-S socket-path] [command [flags]]\n",
1.1       nicm       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) {
1.32      nicm       75:                xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
1.1       nicm       76:                log_open_file(debug_level, path);
                     77:                xfree(path);
                     78:        }
                     79: }
                     80:
1.39      nicm       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: {
1.105     nicm      101:        if (shell == NULL || *shell == '\0' || *shell != '/')
                    102:                return (0);
                    103:        if (areshell(shell))
1.39      nicm      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);
1.107     nicm      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);
1.39      nicm      141: }
                    142:
1.50      nicm      143: void
1.92      nicm      144: parseenvironment(void)
1.50      nicm      145: {
1.103     nicm      146:        char    *env, path[256];
                    147:        long     pid;
                    148:        int      idx;
1.50      nicm      149:
                    150:        if ((env = getenv("TMUX")) == NULL)
                    151:                return;
                    152:
1.104     nicm      153:        if (sscanf(env, "%255[^,],%ld,%d", path, &pid, &idx) != 3)
1.50      nicm      154:                return;
1.103     nicm      155:        environ_path = xstrdup(path);
                    156:        environ_pid = pid;
                    157:        environ_idx = idx;
1.50      nicm      158: }
                    159:
1.1       nicm      160: char *
1.92      nicm      161: makesocketpath(const char *label)
1.1       nicm      162: {
1.102     nicm      163:        char            base[MAXPATHLEN], *path, *s;
1.1       nicm      164:        struct stat     sb;
                    165:        u_int           uid;
                    166:
                    167:        uid = getuid();
1.102     nicm      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);
1.1       nicm      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:
1.101     nicm      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:
1.55      nicm      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);
1.90      nicm      221:
1.101     nicm      222:        setblocking(STDIN_FILENO, 1);
                    223:        setblocking(STDOUT_FILENO, 1);
                    224:        setblocking(STDERR_FILENO, 1);
1.90      nicm      225:        closefrom(STDERR_FILENO + 1);
1.55      nicm      226:
                    227:        execl(shell, argv0, "-c", shellcmd, (char *) NULL);
                    228:        fatal("execl failed");
                    229: }
                    230:
1.1       nicm      231: int
                    232: main(int argc, char **argv)
                    233: {
1.92      nicm      234:        struct passwd   *pw;
                    235:        char            *s, *path, *label, *home, **var;
1.94      nicm      236:        int              opt, flags, quiet, keys;
1.54      nicm      237:
                    238: #ifdef DEBUG
                    239:        malloc_options = (char *) "AFGJPX";
                    240: #endif
1.1       nicm      241:
1.94      nicm      242:        quiet = flags = 0;
1.92      nicm      243:        label = path = NULL;
1.41      nicm      244:        login_shell = (**argv == '-');
1.46      nicm      245:        while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
1.41      nicm      246:                switch (opt) {
1.1       nicm      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;
1.46      nicm      255:                case 'c':
1.92      nicm      256:                        if (shell_cmd != NULL)
                    257:                                xfree(shell_cmd);
                    258:                        shell_cmd = xstrdup(optarg);
1.37      nicm      259:                        break;
1.1       nicm      260:                case 'f':
1.42      nicm      261:                        if (cfg_file != NULL)
1.2       ray       262:                                xfree(cfg_file);
1.1       nicm      263:                        cfg_file = xstrdup(optarg);
1.41      nicm      264:                        break;
                    265:                case 'l':
                    266:                        login_shell = 1;
1.1       nicm      267:                        break;
                    268:                case 'L':
                    269:                        if (label != NULL)
                    270:                                xfree(label);
                    271:                        label = xstrdup(optarg);
                    272:                        break;
1.37      nicm      273:                case 'q':
1.63      nicm      274:                        quiet = 1;
1.37      nicm      275:                        break;
1.1       nicm      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;
1.53      deraadt   287:                default:
1.1       nicm      288:                        usage();
1.53      deraadt   289:                }
                    290:        }
1.1       nicm      291:        argc -= optind;
                    292:        argv += optind;
                    293:
1.92      nicm      294:        if (shell_cmd != NULL && argc != 0)
1.46      nicm      295:                usage();
                    296:
1.1       nicm      297:        log_open_tty(debug_level);
                    298:
1.15      nicm      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:                 */
1.106     nicm      307:                if ((s = getenv("LC_ALL")) == NULL || *s == '\0') {
                    308:                        if ((s = getenv("LC_CTYPE")) == NULL || *s == '\0')
1.15      nicm      309:                                s = getenv("LANG");
                    310:                }
1.26      nicm      311:                if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
                    312:                    strcasestr(s, "UTF8") != NULL))
1.15      nicm      313:                        flags |= IDENTIFY_UTF8;
                    314:        }
                    315:
1.42      nicm      316:        environ_init(&global_environ);
1.62      nicm      317:        for (var = environ; *var != NULL; var++)
1.42      nicm      318:                environ_put(&global_environ, *var);
1.63      nicm      319:
                    320:        options_init(&global_options, NULL);
1.99      nicm      321:        options_table_populate_tree(server_options_table, &global_options);
                    322:        options_set_number(&global_options, "quiet", quiet);
1.42      nicm      323:
1.12      nicm      324:        options_init(&global_s_options, NULL);
1.99      nicm      325:        options_table_populate_tree(session_options_table, &global_s_options);
                    326:        options_set_string(&global_s_options, "default-shell", "%s", getshell());
1.44      nicm      327:
1.99      nicm      328:        options_init(&global_w_options, NULL);
                    329:        options_table_populate_tree(window_options_table, &global_w_options);
1.42      nicm      330:
1.99      nicm      331:        /* Enable UTF-8 if the first client is on UTF-8 terminal. */
1.62      nicm      332:        if (flags & IDENTIFY_UTF8) {
1.99      nicm      333:                options_set_number(&global_s_options, "status-utf8", 1);
1.100     nicm      334:                options_set_number(&global_s_options, "mouse-utf8", 1);
1.99      nicm      335:                options_set_number(&global_w_options, "utf8", 1);
1.42      nicm      336:        }
1.94      nicm      337:
1.99      nicm      338:        /* Override keys to vi if VISUAL or EDITOR are set. */
1.94      nicm      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;
1.99      nicm      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);
1.94      nicm      348:        }
1.1       nicm      349:
1.92      nicm      350:        /* Locate the configuration file. */
1.1       nicm      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);
1.69      nicm      359:                if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
1.1       nicm      360:                        xfree(cfg_file);
                    361:                        cfg_file = NULL;
                    362:                }
                    363:        }
1.62      nicm      364:
1.68      nicm      365:        /*
1.92      nicm      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.
1.68      nicm      368:         */
1.92      nicm      369:        parseenvironment();
1.68      nicm      370:        if (path == NULL) {
1.92      nicm      371:                /* If no -L, use the environment. */
1.68      nicm      372:                if (label == NULL) {
1.92      nicm      373:                        if (environ_path != NULL)
                    374:                                path = xstrdup(environ_path);
                    375:                        else
1.68      nicm      376:                                label = xstrdup("default");
                    377:                }
                    378:
                    379:                /* -L or default set. */
                    380:                if (label != NULL) {
1.92      nicm      381:                        if ((path = makesocketpath(label)) == NULL) {
1.68      nicm      382:                                log_warn("can't create socket");
                    383:                                exit(1);
                    384:                        }
                    385:                }
1.1       nicm      386:        }
1.68      nicm      387:        if (label != NULL)
                    388:                xfree(label);
1.92      nicm      389:        if (realpath(path, socket_path) == NULL)
                    390:                strlcpy(socket_path, path, sizeof socket_path);
                    391:        xfree(path);
1.1       nicm      392:
1.92      nicm      393:        /* Set process title. */
                    394:        setproctitle("%s (%s)", __progname, socket_path);
1.1       nicm      395:
1.92      nicm      396:        /* Pass control to the client. */
1.78      nicm      397:        ev_base = event_init();
1.92      nicm      398:        exit(client_main(argc, argv, flags));
1.1       nicm      399: }