mirror of
https://github.com/tmux/tmux.git
synced 2024-12-13 01:48:47 +00:00
2a5702a936
umask 177 instead of 117 because it may not be in a safe directory like the default directory in /tmp. The user can chmod it more open after it is created if they want.
398 lines
8.8 KiB
C
398 lines
8.8 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/utsname.h>
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#include <err.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <util.h>
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#include "tmux.h"
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struct options *global_options; /* server options */
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struct options *global_s_options; /* session options */
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struct options *global_w_options; /* window options */
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struct environ *global_environ;
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struct timeval start_time;
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const char *socket_path;
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int ptm_fd = -1;
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const char *shell_command;
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static __dead void usage(void);
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static char *make_label(const char *, char **);
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static const char *getshell(void);
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static int checkshell(const char *);
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static __dead void
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-2CluvV] [-c shell-command] [-f file] [-L socket-name]\n"
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" [-S socket-path] [command [flags]]\n",
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getprogname());
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exit(1);
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}
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static const char *
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getshell(void)
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{
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struct passwd *pw;
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const char *shell;
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shell = getenv("SHELL");
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if (checkshell(shell))
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return (shell);
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pw = getpwuid(getuid());
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if (pw != NULL && checkshell(pw->pw_shell))
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return (pw->pw_shell);
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return (_PATH_BSHELL);
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}
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static int
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checkshell(const char *shell)
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{
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if (shell == NULL || *shell != '/')
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return (0);
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if (areshell(shell))
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return (0);
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if (access(shell, X_OK) != 0)
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return (0);
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return (1);
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}
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int
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areshell(const char *shell)
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{
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const char *progname, *ptr;
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if ((ptr = strrchr(shell, '/')) != NULL)
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ptr++;
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else
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ptr = shell;
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progname = getprogname();
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if (*progname == '-')
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progname++;
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if (strcmp(ptr, progname) == 0)
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return (1);
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return (0);
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}
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static char *
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make_label(const char *label, char **cause)
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{
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char *base, resolved[PATH_MAX], *path, *s;
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struct stat sb;
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uid_t uid;
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*cause = NULL;
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if (label == NULL)
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label = "default";
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uid = getuid();
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if ((s = getenv("TMUX_TMPDIR")) != NULL && *s != '\0')
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xasprintf(&base, "%s/tmux-%ld", s, (long)uid);
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else
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xasprintf(&base, "%s/tmux-%ld", _PATH_TMP, (long)uid);
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if (realpath(base, resolved) == NULL &&
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strlcpy(resolved, base, sizeof resolved) >= sizeof resolved) {
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errno = ERANGE;
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free(base);
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goto fail;
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}
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free(base);
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if (mkdir(resolved, S_IRWXU) != 0 && errno != EEXIST)
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goto fail;
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if (lstat(resolved, &sb) != 0)
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goto fail;
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if (!S_ISDIR(sb.st_mode)) {
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errno = ENOTDIR;
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goto fail;
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}
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if (sb.st_uid != uid || (sb.st_mode & S_IRWXO) != 0) {
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errno = EACCES;
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goto fail;
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}
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xasprintf(&path, "%s/%s", resolved, label);
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return (path);
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fail:
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xasprintf(cause, "error creating %s (%s)", resolved, strerror(errno));
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return (NULL);
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}
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void
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setblocking(int fd, int state)
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{
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int mode;
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if ((mode = fcntl(fd, F_GETFL)) != -1) {
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if (!state)
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mode |= O_NONBLOCK;
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else
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mode &= ~O_NONBLOCK;
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fcntl(fd, F_SETFL, mode);
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}
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}
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const char *
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find_cwd(void)
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{
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char resolved1[PATH_MAX], resolved2[PATH_MAX];
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static char cwd[PATH_MAX];
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const char *pwd;
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if (getcwd(cwd, sizeof cwd) == NULL)
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return (NULL);
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if ((pwd = getenv("PWD")) == NULL || *pwd == '\0')
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return (cwd);
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/*
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* We want to use PWD so that symbolic links are maintained,
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* but only if it matches the actual working directory.
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*/
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if (realpath(pwd, resolved1) == NULL)
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return (cwd);
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if (realpath(cwd, resolved2) == NULL)
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return (cwd);
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if (strcmp(resolved1, resolved2) != 0)
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return (cwd);
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return (pwd);
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}
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const char *
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find_home(void)
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{
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struct passwd *pw;
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static const char *home;
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if (home != NULL)
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return (home);
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home = getenv("HOME");
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if (home == NULL || *home == '\0') {
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pw = getpwuid(getuid());
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if (pw != NULL)
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home = pw->pw_dir;
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else
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home = NULL;
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}
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return (home);
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}
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const char *
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getversion(void)
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{
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static char *version;
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struct utsname u;
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if (version == NULL) {
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if (uname(&u) < 0)
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fatalx("uname failed");
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xasprintf(&version, "openbsd-%s", u.release);
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}
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return version;
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}
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int
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main(int argc, char **argv)
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{
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char *path, *label, *cause, **var;
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const char *s, *shell, *cwd;
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int opt, flags, keys;
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const struct options_table_entry *oe;
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if (setlocale(LC_CTYPE, "en_US.UTF-8") == NULL &&
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setlocale(LC_CTYPE, "C.UTF-8") == NULL) {
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if (setlocale(LC_CTYPE, "") == NULL)
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errx(1, "invalid LC_ALL, LC_CTYPE or LANG");
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s = nl_langinfo(CODESET);
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if (strcasecmp(s, "UTF-8") != 0 && strcasecmp(s, "UTF8") != 0)
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errx(1, "need UTF-8 locale (LC_CTYPE) but have %s", s);
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}
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setlocale(LC_TIME, "");
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tzset();
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if (**argv == '-')
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flags = CLIENT_LOGIN;
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else
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flags = 0;
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label = path = NULL;
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while ((opt = getopt(argc, argv, "2c:Cdf:lL:qS:uUvV")) != -1) {
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switch (opt) {
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case '2':
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flags |= CLIENT_256COLOURS;
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break;
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case 'c':
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shell_command = optarg;
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break;
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case 'C':
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if (flags & CLIENT_CONTROL)
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flags |= CLIENT_CONTROLCONTROL;
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else
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flags |= CLIENT_CONTROL;
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break;
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case 'f':
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set_cfg_file(optarg);
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break;
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case 'V':
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printf("%s %s\n", getprogname(), getversion());
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exit(0);
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case 'l':
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flags |= CLIENT_LOGIN;
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break;
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case 'L':
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free(label);
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label = xstrdup(optarg);
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break;
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case 'q':
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break;
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case 'S':
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free(path);
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path = xstrdup(optarg);
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break;
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case 'u':
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flags |= CLIENT_UTF8;
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break;
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case 'v':
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log_add_level();
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (shell_command != NULL && argc != 0)
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usage();
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if ((ptm_fd = getptmfd()) == -1)
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err(1, "getptmfd");
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if (pledge("stdio rpath wpath cpath flock fattr unix getpw sendfd "
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"recvfd proc exec tty ps", NULL) != 0)
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err(1, "pledge");
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/*
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* tmux is a UTF-8 terminal, so if TMUX is set, assume UTF-8.
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* Otherwise, if the user has set LC_ALL, LC_CTYPE or LANG to contain
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* UTF-8, it is a safe assumption that either they are using a UTF-8
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* terminal, or if not they know that output from UTF-8-capable
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* programs may be wrong.
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*/
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if (getenv("TMUX") != NULL)
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flags |= CLIENT_UTF8;
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else {
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s = getenv("LC_ALL");
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if (s == NULL || *s == '\0')
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s = getenv("LC_CTYPE");
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if (s == NULL || *s == '\0')
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s = getenv("LANG");
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if (s == NULL || *s == '\0')
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s = "";
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if (strcasestr(s, "UTF-8") != NULL ||
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strcasestr(s, "UTF8") != NULL)
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flags |= CLIENT_UTF8;
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}
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global_environ = environ_create();
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for (var = environ; *var != NULL; var++)
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environ_put(global_environ, *var);
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if ((cwd = find_cwd()) != NULL)
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environ_set(global_environ, "PWD", "%s", cwd);
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global_options = options_create(NULL);
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global_s_options = options_create(NULL);
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global_w_options = options_create(NULL);
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for (oe = options_table; oe->name != NULL; oe++) {
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if (oe->scope & OPTIONS_TABLE_SERVER)
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options_default(global_options, oe);
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if (oe->scope & OPTIONS_TABLE_SESSION)
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options_default(global_s_options, oe);
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if (oe->scope & OPTIONS_TABLE_WINDOW)
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options_default(global_w_options, oe);
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}
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/*
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* The default shell comes from SHELL or from the user's passwd entry
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* if available.
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*/
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shell = getshell();
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options_set_string(global_s_options, "default-shell", 0, "%s", shell);
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/* Override keys to vi if VISUAL or EDITOR are set. */
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if ((s = getenv("VISUAL")) != NULL || (s = getenv("EDITOR")) != NULL) {
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if (strrchr(s, '/') != NULL)
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s = strrchr(s, '/') + 1;
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if (strstr(s, "vi") != NULL)
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keys = MODEKEY_VI;
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else
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keys = MODEKEY_EMACS;
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options_set_number(global_s_options, "status-keys", keys);
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options_set_number(global_w_options, "mode-keys", keys);
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}
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/*
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* If socket is specified on the command-line with -S or -L, it is
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* used. Otherwise, $TMUX is checked and if that fails "default" is
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* used.
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*/
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if (path == NULL && label == NULL) {
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s = getenv("TMUX");
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if (s != NULL && *s != '\0' && *s != ',') {
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path = xstrdup(s);
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path[strcspn(path, ",")] = '\0';
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}
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}
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if (path == NULL) {
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if ((path = make_label(label, &cause)) == NULL) {
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if (cause != NULL) {
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fprintf(stderr, "%s\n", cause);
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free(cause);
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}
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exit(1);
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}
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flags |= CLIENT_DEFAULTSOCKET;
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}
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socket_path = path;
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free(label);
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/* Pass control to the client. */
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exit(client_main(event_init(), argc, argv, flags));
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}
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