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tmux/tmux.c
Tiago Cunha a9b6bfdddd Sync OpenBSD patchset 243: 
Switch tmux to use imsg. This is the last major change to make the
client-server protocol more resilient and make the protocol versioning work
properly. In future, the only things requiring a protocol version bump will be
changes in the message structs, and (when both client and server have this
change) mixing different versions should nicely report an error message.

As a side effect this also makes the code tidier, fixes a problem with the way
errors reported during server startup were handled, and supports fd passing
(which will be used in future).

Looked over by eric@, thanks.

Please note that mixing a client with this change with an older server or vice
versa may cause tmux to crash or hang - tmux should be completely exited before
upgrading.
2009-08-14 21:04:04 +00:00

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/* $Id: tmux.c,v 1.160 2009-08-14 21:04:04 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 */
struct environ global_environ;
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 msgtype *, void **, size_t *, int);
int prepare_cmd(enum msgtype *, void **, size_t *, int, char **);
int dispatch_imsg(struct client_ctx *, int *);
#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 msgtype *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 msgtype *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 msgtype msg;
struct passwd *pw;
char *s, *path, *label, *home, *cause, **var;
char cwd[MAXPATHLEN];
void *buf;
size_t len;
int retcode, opt, flags, unlock, cmdflags = 0;
int nfds;
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();
environ_init(&global_environ);
for (var = environ; *var != NULL; var++)
environ_put(&global_environ, *var);
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 ||
strcasestr(s, "UTF8") != 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", 0);
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", 0);
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_string(&global_s_options, "status-left", "[#S]");
options_set_number(&global_s_options, "status-left-attr", 0);
options_set_number(&global_s_options, "status-left-fg", 8);
options_set_number(&global_s_options, "status-left-bg", 8);
options_set_number(&global_s_options, "status-left-length", 10);
options_set_string(
&global_s_options, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
options_set_number(&global_s_options, "status-right-attr", 0);
options_set_number(&global_s_options, "status-right-fg", 8);
options_set_number(&global_s_options, "status-right-bg", 8);
options_set_number(&global_s_options, "status-right-length", 40);
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_string(&global_s_options,
"terminal-overrides", "*88col*:colors=88,*256col*:colors=256");
options_set_string(&global_s_options, "update-environment", "DISPLAY");
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, "main-pane-width", 81);
options_set_number(&global_w_options, "main-pane-height", 24);
options_set_number(&global_w_options, "mode-attr", 0);
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, "mode-mouse", 1);
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|CMD_SENDENVIRON;
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;
if (cmd->entry->flags & CMD_SENDENVIRON)
cmdflags |= CMD_SENDENVIRON;
}
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.ibuf.fd;
pfd.events = POLLIN;
if (cctx.ibuf.w.queued != 0)
pfd.events |= POLLOUT;
if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (nfds == 0)
continue;
if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
fatalx("socket error");
if (pfd.revents & POLLIN) {
if (dispatch_imsg(&cctx, &retcode) != 0)
break;
}
if (pfd.revents & POLLOUT) {
if (msgbuf_write(&cctx.ibuf.w) < 0)
fatalx("msgbuf_write failed");
}
}
options_free(&global_s_options);
options_free(&global_w_options);
return (retcode);
}
int
dispatch_imsg(struct client_ctx *cctx, int *retcode)
{
struct imsg imsg;
ssize_t n, datalen;
struct msg_print_data printdata;
if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0)
fatalx("imsg_read failed");
for (;;) {
if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1)
fatalx("imsg_get failed");
if (n == 0)
return (0);
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
switch (imsg.hdr.type) {
case MSG_EXIT:
case MSG_SHUTDOWN:
if (datalen != 0)
fatalx("bad MSG_EXIT size");
return (-1);
case MSG_ERROR:
*retcode = 1;
/* FALLTHROUGH */
case MSG_PRINT:
if (datalen != sizeof printdata)
fatalx("bad MSG_PRINT size");
memcpy(&printdata, imsg.data, sizeof printdata);
printdata.msg[(sizeof printdata.msg) - 1] = '\0';
log_info("%s", printdata.msg);
break;
case MSG_READY:
if (datalen != 0)
fatalx("bad MSG_READY size");
*retcode = client_main(cctx);
return (-1);
case MSG_VERSION:
if (datalen != 0)
fatalx("bad MSG_VERSION size");
log_warnx("protocol version mismatch (client %u, "
"server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
*retcode = 1;
return (-1);
default:
fatalx("unexpected message");
}
imsg_free(&imsg);
}
}
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