mirror of
https://github.com/tmux/tmux.git
synced 2024-12-26 11:28:47 +00:00
521 lines
12 KiB
C
521 lines
12 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 <errno.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 <pwd.h>
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#include <signal.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 "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 int areshell(const char *);
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static const char *getshell(void);
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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 [-2CDlNuvV] [-c shell-command] [-f file] [-L socket-name]\n"
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" [-S socket-path] [-T features] [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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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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static 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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expand_path(const char *path, const char *home)
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{
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char *expanded, *name;
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const char *end;
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struct environ_entry *value;
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if (strncmp(path, "~/", 2) == 0) {
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if (home == NULL)
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return (NULL);
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xasprintf(&expanded, "%s%s", home, path + 1);
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return (expanded);
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}
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if (*path == '$') {
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end = strchr(path, '/');
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if (end == NULL)
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name = xstrdup(path + 1);
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else
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name = xstrndup(path + 1, end - path - 1);
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value = environ_find(global_environ, name);
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free(name);
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if (value == NULL)
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return (NULL);
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if (end == NULL)
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end = "";
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xasprintf(&expanded, "%s%s", value->value, end);
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return (expanded);
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}
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return (xstrdup(path));
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}
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static void
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expand_paths(const char *s, char ***paths, u_int *n, int ignore_errors)
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{
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const char *home = find_home();
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char *copy, *next, *tmp, resolved[PATH_MAX], *expanded;
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char *path;
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u_int i;
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*paths = NULL;
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*n = 0;
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copy = tmp = xstrdup(s);
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while ((next = strsep(&tmp, ":")) != NULL) {
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expanded = expand_path(next, home);
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if (expanded == NULL) {
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log_debug("%s: invalid path: %s", __func__, next);
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continue;
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}
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if (realpath(expanded, resolved) == NULL) {
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log_debug("%s: realpath(\"%s\") failed: %s", __func__,
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expanded, strerror(errno));
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if (ignore_errors) {
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free(expanded);
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continue;
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}
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path = expanded;
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} else {
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path = xstrdup(resolved);
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free(expanded);
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}
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for (i = 0; i < *n; i++) {
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if (strcmp(path, (*paths)[i]) == 0)
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break;
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}
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if (i != *n) {
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log_debug("%s: duplicate path: %s", __func__, path);
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free(path);
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continue;
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}
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*paths = xreallocarray(*paths, (*n) + 1, sizeof *paths);
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(*paths)[(*n)++] = path;
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}
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free(copy);
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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 **paths, *path, *base;
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u_int i, n;
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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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expand_paths(TMUX_SOCK, &paths, &n, 1);
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if (n == 0) {
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xasprintf(cause, "no suitable socket path");
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return (NULL);
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}
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path = paths[0]; /* can only have one socket! */
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for (i = 1; i < n; i++)
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free(paths[i]);
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free(paths);
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xasprintf(&base, "%s/tmux-%ld", path, (long)uid);
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free(path);
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if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST) {
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xasprintf(cause, "couldn't create directory %s (%s)", base,
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strerror(errno));
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goto fail;
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}
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if (lstat(base, &sb) != 0) {
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xasprintf(cause, "couldn't read directory %s (%s)", base,
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strerror(errno));
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goto fail;
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}
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if (!S_ISDIR(sb.st_mode)) {
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xasprintf(cause, "%s is not a directory", base);
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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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xasprintf(cause, "directory %s has unsafe permissions", base);
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goto fail;
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}
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xasprintf(&path, "%s/%s", base, label);
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free(base);
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return (path);
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fail:
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free(base);
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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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uint64_t
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get_timer(void)
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{
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struct timespec ts;
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/*
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* We want a timestamp in milliseconds suitable for time measurement,
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* so prefer the monotonic clock.
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*/
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if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
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clock_gettime(CLOCK_REALTIME, &ts);
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return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
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}
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const char *
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sig2name(int signo)
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{
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static char s[11];
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#ifdef HAVE_SYS_SIGNAME
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if (signo > 0 && signo < NSIG)
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return (sys_signame[signo]);
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#endif
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xsnprintf(s, sizeof s, "%d", signo);
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return (s);
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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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return TMUX_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 = NULL, *label = NULL;
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char *cause, **var;
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const char *s, *cwd;
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int opt, keys, feat = 0, fflag = 0;
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uint64_t flags = 0;
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const struct options_table_entry *oe;
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u_int i;
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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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global_environ = environ_create();
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for (var = environ; *var != NULL; var++)
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environ_put(global_environ, *var, 0);
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if ((cwd = find_cwd()) != NULL)
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environ_set(global_environ, "PWD", 0, "%s", cwd);
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expand_paths(TMUX_CONF, &cfg_files, &cfg_nfiles, 1);
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while ((opt = getopt(argc, argv, "2c:CDdf:lL:NqS:T:uUvV")) != -1) {
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switch (opt) {
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case '2':
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tty_add_features(&feat, "256", ":,");
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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 'D':
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flags |= CLIENT_NOFORK;
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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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if (!fflag) {
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fflag = 1;
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for (i = 0; i < cfg_nfiles; i++)
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free(cfg_files[i]);
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cfg_nfiles = 0;
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}
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cfg_files = xreallocarray(cfg_files, cfg_nfiles + 1,
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sizeof *cfg_files);
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cfg_files[cfg_nfiles++] = xstrdup(optarg);
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cfg_quiet = 0;
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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 'N':
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flags |= CLIENT_NOSTARTSERVER;
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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 'T':
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tty_add_features(&feat, 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 ((flags & CLIENT_NOFORK) && 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_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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options_set_string(global_s_options, "default-shell", 0, "%s",
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getshell());
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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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options_set_string(global_options, "editor", 0, "%s", s);
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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(osdep_event_init(), argc, argv, flags, feat));
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}
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