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tmux/tmux.c
Tiago Cunha d637cb33da Sync OpenBSD patchset 181: 
Make all messages sent between the client and server fixed size.

This is the first of two changes to make the protocol more resilient and less
sensitive to other changes in the code, particularly with commands. The client
now packs argv into a buffer and sends it to the server for parsing, rather
than doing it itself and sending the parsed command data.

As a side-effect this also removes a lot of now-unused command marshalling
code.

Mixing a server without this change and a client with or vice versa will cause
tmux to hang or crash, please ensure that tmux is entirely killed before
upgrading.
2009-07-28 22:12:16 +00:00

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/* $Id: tmux.c,v 1.150 2009-07-28 22:12:16 tcunha Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
#ifdef DEBUG
/* DragonFly uses an OpenBSD-like malloc() since 1.6 */
#if defined(__OpenBSD__) || defined(__DragonFly__)
const char *malloc_options = "AFGJPX";
#endif
#ifdef __FreeBSD__
const char *_malloc_options = "AJX";
#endif
#endif
volatile sig_atomic_t sigwinch;
volatile sig_atomic_t sigterm;
volatile sig_atomic_t sigcont;
volatile sig_atomic_t sigchld;
volatile sig_atomic_t sigusr1;
volatile sig_atomic_t sigusr2;
char *cfg_file;
struct options global_s_options; /* session options */
struct options global_w_options; /* window options */
int server_locked;
u_int password_failures;
char *server_password;
time_t server_activity;
int debug_level;
int be_quiet;
time_t start_time;
char *socket_path;
__dead void usage(void);
char *makesockpath(const char *);
int prepare_unlock(enum hdrtype *, void **, size_t *, int);
int prepare_cmd(enum hdrtype *, void **, size_t *, int, char **);
#ifndef HAVE_PROGNAME
char *__progname = (char *) "tmux";
#endif
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-28dqUuv] [-f file] [-L socket-name] [-S socket-path]\n"
" [command [flags]]\n",
__progname);
exit(1);
}
void
logfile(const char *name)
{
char *path;
log_close();
if (debug_level > 0) {
xasprintf(
&path, "%s-%s-%ld.log", __progname, name, (long) getpid());
log_open_file(debug_level, path);
xfree(path);
}
}
void
sighandler(int sig)
{
int saved_errno;
saved_errno = errno;
switch (sig) {
case SIGWINCH:
sigwinch = 1;
break;
case SIGTERM:
sigterm = 1;
break;
case SIGCHLD:
sigchld = 1;
break;
case SIGCONT:
sigcont = 1;
break;
case SIGUSR1:
sigusr1 = 1;
break;
case SIGUSR2:
sigusr2 = 1;
break;
}
errno = saved_errno;
}
void
siginit(void)
{
struct sigaction act;
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGINT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGQUIT, &act, NULL) != 0)
fatal("sigaction failed");
act.sa_handler = sighandler;
if (sigaction(SIGWINCH, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTERM, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCHLD, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR1, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &act, NULL) != 0)
fatal("sigaction failed");
}
void
sigreset(void)
{
struct sigaction act;
memset(&act, 0, sizeof act);
sigemptyset(&act.sa_mask);
act.sa_handler = SIG_DFL;
if (sigaction(SIGPIPE, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR1, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGUSR2, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGINT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTSTP, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGQUIT, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGWINCH, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGTERM, &act, NULL) != 0)
fatal("sigaction failed");
if (sigaction(SIGCHLD, &act, NULL) != 0)
fatal("sigaction failed");
}
char *
makesockpath(const char *label)
{
char base[MAXPATHLEN], *path;
struct stat sb;
u_int uid;
uid = getuid();
xsnprintf(base, MAXPATHLEN, "%s/%s-%d", _PATH_TMP, __progname, uid);
if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
return (NULL);
if (lstat(base, &sb) != 0)
return (NULL);
if (!S_ISDIR(sb.st_mode)) {
errno = ENOTDIR;
return (NULL);
}
if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
errno = EACCES;
return (NULL);
}
xasprintf(&path, "%s/%s", base, label);
return (path);
}
int
prepare_unlock(enum hdrtype *msg, void **buf, size_t *len, int argc)
{
static struct msg_unlock_data unlockdata;
char *pass;
if (argc != 0) {
log_warnx("can't specify a command when unlocking");
return (-1);
}
if ((pass = getpass("Password: ")) == NULL)
return (-1);
if (strlen(pass) >= sizeof unlockdata.pass) {
log_warnx("password too long");
return (-1);
}
strlcpy(unlockdata.pass, pass, sizeof unlockdata.pass);
memset(pass, 0, strlen(pass));
*buf = &unlockdata;
*len = sizeof unlockdata;
*msg = MSG_UNLOCK;
return (0);
}
int
prepare_cmd(enum hdrtype *msg, void **buf, size_t *len, int argc, char **argv)
{
static struct msg_command_data cmddata;
client_fill_session(&cmddata);
cmddata.argc = argc;
if (cmd_pack_argv(argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
log_warnx("command too long");
return (-1);
}
*buf = &cmddata;
*len = sizeof cmddata;
*msg = MSG_COMMAND;
return (0);
}
int
main(int argc, char **argv)
{
struct client_ctx cctx;
struct cmd_list *cmdlist;
struct cmd *cmd;
struct pollfd pfd;
enum hdrtype msg;
struct hdr hdr;
struct passwd *pw;
struct msg_print_data printdata;
char *s, *path, *label, *home, *cause;
char cwd[MAXPATHLEN];
void *buf;
size_t len;
int retcode, opt, flags, unlock, cmdflags = 0;
unlock = flags = 0;
label = path = NULL;
while ((opt = getopt(argc, argv, "28df:L:qS:uUv")) != -1) {
switch (opt) {
case '2':
flags |= IDENTIFY_256COLOURS;
flags &= ~IDENTIFY_88COLOURS;
break;
case '8':
flags |= IDENTIFY_88COLOURS;
flags &= ~IDENTIFY_256COLOURS;
break;
case 'f':
if (cfg_file)
xfree(cfg_file);
cfg_file = xstrdup(optarg);
break;
case 'L':
if (label != NULL)
xfree(label);
label = xstrdup(optarg);
break;
case 'S':
if (path != NULL)
xfree(path);
path = xstrdup(optarg);
break;
case 'q':
be_quiet = 1;
break;
case 'u':
flags |= IDENTIFY_UTF8;
break;
case 'U':
unlock = 1;
break;
case 'd':
flags |= IDENTIFY_HASDEFAULTS;
break;
case 'v':
debug_level++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
log_open_tty(debug_level);
siginit();
if (!(flags & IDENTIFY_UTF8)) {
/*
* If the user has set whichever of LC_ALL, LC_CTYPE or LANG
* exist (in that order) to contain UTF-8, it is a safe
* assumption that either they are using a UTF-8 terminal, or
* if not they know that output from UTF-8-capable programs may
* be wrong.
*/
if ((s = getenv("LC_ALL")) == NULL) {
if ((s = getenv("LC_CTYPE")) == NULL)
s = getenv("LANG");
}
if (s != NULL && strcasestr(s, "UTF-8") != NULL)
flags |= IDENTIFY_UTF8;
}
options_init(&global_s_options, NULL);
options_set_number(&global_s_options, "bell-action", BELL_ANY);
options_set_number(&global_s_options, "buffer-limit", 9);
options_set_string(&global_s_options, "default-command", "%s", "");
options_set_string(&global_s_options, "default-terminal", "screen");
options_set_number(&global_s_options, "display-time", 750);
options_set_number(&global_s_options, "history-limit", 2000);
options_set_number(&global_s_options, "lock-after-time", 0);
options_set_number(&global_s_options, "message-attr", GRID_ATTR_REVERSE);
options_set_number(&global_s_options, "message-bg", 3);
options_set_number(&global_s_options, "message-fg", 0);
options_set_number(&global_s_options, "prefix", '\002');
options_set_number(&global_s_options, "repeat-time", 500);
options_set_number(&global_s_options, "set-remain-on-exit", 0);
options_set_number(&global_s_options, "set-titles", 0);
options_set_number(&global_s_options, "status", 1);
options_set_number(&global_s_options, "status-attr", GRID_ATTR_REVERSE);
options_set_number(&global_s_options, "status-bg", 2);
options_set_number(&global_s_options, "status-fg", 0);
options_set_number(&global_s_options, "status-interval", 15);
options_set_number(&global_s_options, "status-keys", MODEKEY_EMACS);
options_set_number(&global_s_options, "status-justify", 0);
options_set_number(&global_s_options, "status-left-length", 10);
options_set_number(&global_s_options, "status-right-length", 40);
options_set_string(&global_s_options, "status-left", "[#S]");
options_set_string(
&global_s_options, "status-right", "\"#24T\" %%H:%%M %%d-%%b-%%y");
if (flags & IDENTIFY_UTF8)
options_set_number(&global_s_options, "status-utf8", 1);
else
options_set_number(&global_s_options, "status-utf8", 0);
options_set_number(&global_s_options, "visual-activity", 0);
options_set_number(&global_s_options, "visual-bell", 0);
options_set_number(&global_s_options, "visual-content", 0);
options_init(&global_w_options, NULL);
options_set_number(&global_w_options, "aggressive-resize", 0);
options_set_number(&global_w_options, "automatic-rename", 1);
options_set_number(&global_w_options, "clock-mode-colour", 4);
options_set_number(&global_w_options, "clock-mode-style", 1);
options_set_number(&global_w_options, "force-height", 0);
options_set_number(&global_w_options, "force-width", 0);
options_set_number(&global_w_options, "mode-attr", GRID_ATTR_REVERSE);
options_set_number(&global_w_options, "main-pane-width", 81);
options_set_number(&global_w_options, "main-pane-height", 24);
options_set_number(&global_w_options, "mode-bg", 3);
options_set_number(&global_w_options, "mode-fg", 0);
options_set_number(&global_w_options, "mode-keys", MODEKEY_EMACS);
options_set_number(&global_w_options, "monitor-activity", 0);
options_set_string(&global_w_options, "monitor-content", "%s", "");
if (flags & IDENTIFY_UTF8)
options_set_number(&global_w_options, "utf8", 1);
else
options_set_number(&global_w_options, "utf8", 0);
options_set_number(&global_w_options, "window-status-attr", 0);
options_set_number(&global_w_options, "window-status-bg", 8);
options_set_number(&global_w_options, "window-status-fg", 8);
options_set_number(&global_w_options, "window-status-current-attr", 0);
options_set_number(&global_w_options, "window-status-current-bg", 8);
options_set_number(&global_w_options, "window-status-current-fg", 8);
options_set_number(&global_w_options, "xterm-keys", 0);
options_set_number(&global_w_options, "remain-on-exit", 0);
if (cfg_file == NULL) {
home = getenv("HOME");
if (home == NULL || *home == '\0') {
pw = getpwuid(getuid());
if (pw != NULL)
home = pw->pw_dir;
}
xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
if (access(cfg_file, R_OK) != 0) {
xfree(cfg_file);
cfg_file = NULL;
}
} else {
if (access(cfg_file, R_OK) != 0) {
log_warn("%s", cfg_file);
exit(1);
}
}
if (label == NULL)
label = xstrdup("default");
if (path == NULL && (path = makesockpath(label)) == NULL) {
log_warn("can't create socket");
exit(1);
}
xfree(label);
if (getcwd(cwd, sizeof cwd) == NULL) {
pw = getpwuid(getuid());
if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
strlcpy(cwd, pw->pw_dir, sizeof cwd);
else
strlcpy(cwd, "/", sizeof cwd);
}
options_set_string(&global_s_options, "default-path", "%s", cwd);
if (unlock) {
if (prepare_unlock(&msg, &buf, &len, argc) != 0)
exit(1);
} else {
if (prepare_cmd(&msg, &buf, &len, argc, argv) != 0)
exit(1);
}
if (unlock)
cmdflags &= ~CMD_STARTSERVER;
else if (argc == 0)
cmdflags |= CMD_STARTSERVER;
else {
/*
* It sucks parsing the command string twice (in client and
* later in server) but it is necessary to get the start server
* flag.
*/
if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
log_warnx("%s", cause);
exit(1);
}
cmdflags &= ~CMD_STARTSERVER;
TAILQ_FOREACH(cmd, cmdlist, qentry) {
if (cmd->entry->flags & CMD_STARTSERVER) {
cmdflags |= CMD_STARTSERVER;
break;
}
}
cmd_list_free(cmdlist);
}
memset(&cctx, 0, sizeof cctx);
if (client_init(path, &cctx, cmdflags, flags) != 0)
exit(1);
xfree(path);
client_write_server(&cctx, msg, buf, len);
memset(buf, 0, len);
retcode = 0;
for (;;) {
pfd.fd = cctx.srv_fd;
pfd.events = POLLIN;
if (BUFFER_USED(cctx.srv_out) > 0)
pfd.events |= POLLOUT;
if (poll(&pfd, 1, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (buffer_poll(&pfd, cctx.srv_in, cctx.srv_out) != 0)
goto out;
restart:
if (BUFFER_USED(cctx.srv_in) < sizeof hdr)
continue;
memcpy(&hdr, BUFFER_OUT(cctx.srv_in), sizeof hdr);
if (BUFFER_USED(cctx.srv_in) < (sizeof hdr) + hdr.size)
continue;
buffer_remove(cctx.srv_in, sizeof hdr);
switch (hdr.type) {
case MSG_EXIT:
case MSG_SHUTDOWN:
goto out;
case MSG_ERROR:
retcode = 1;
/* FALLTHROUGH */
case MSG_PRINT:
if (hdr.size < sizeof printdata)
fatalx("bad MSG_PRINT size");
buffer_read(cctx.srv_in, &printdata, sizeof printdata);
printdata.msg[(sizeof printdata.msg) - 1] = '\0';
log_info("%s", printdata.msg);
goto restart;
case MSG_READY:
retcode = client_main(&cctx);
goto out;
default:
fatalx("unexpected command");
}
}
out:
options_free(&global_s_options);
options_free(&global_w_options);
close(cctx.srv_fd);
buffer_destroy(cctx.srv_in);
buffer_destroy(cctx.srv_out);
return (retcode);
}
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