tmux/client.c

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/* $Id: client.c,v 1.97 2010-08-29 14:44:55 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/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
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#include <sys/wait.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
struct imsgbuf client_ibuf;
struct event client_event;
const char *client_exitmsg;
int client_exitval;
void client_send_identify(int);
void client_send_environ(void);
void client_write_server(enum msgtype, void *, size_t);
void client_update_event(void);
void client_signal(int, short, void *);
void client_callback(int, short, void *);
int client_dispatch(void);
struct imsgbuf *
client_init(char *path, int cmdflags, int flags)
{
struct sockaddr_un sa;
size_t size;
int fd, mode;
#ifdef HAVE_SETPROCTITLE
char rpathbuf[MAXPATHLEN];
#endif
#ifdef HAVE_SETPROCTITLE
if (realpath(path, rpathbuf) == NULL)
strlcpy(rpathbuf, path, sizeof rpathbuf);
setproctitle("client (%s)", rpathbuf);
#endif
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
if (size >= sizeof sa.sun_path) {
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errno = ENAMETOOLONG;
goto not_found;
}
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
fatal("socket failed");
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if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
if (!(cmdflags & CMD_STARTSERVER))
goto not_found;
switch (errno) {
case ECONNREFUSED:
if (unlink(path) != 0)
goto not_found;
/* FALLTHROUGH */
case ENOENT:
if ((fd = server_start(path)) == -1)
goto start_failed;
goto server_started;
}
goto not_found;
}
server_started:
if ((mode = fcntl(fd, F_GETFL)) == -1)
fatal("fcntl failed");
if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1)
fatal("fcntl failed");
if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
fatal("fcntl failed");
imsg_init(&client_ibuf, fd);
event_set(&client_event, fd, EV_READ, client_callback, NULL);
if (cmdflags & CMD_SENDENVIRON)
client_send_environ();
client_send_identify(flags);
return (&client_ibuf);
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start_failed:
log_warnx("server failed to start");
return (NULL);
not_found:
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log_warn("server not found");
return (NULL);
}
void
client_send_identify(int flags)
{
struct msg_identify_data data;
char *term;
int fd;
data.flags = flags;
if (getcwd(data.cwd, sizeof data.cwd) == NULL)
*data.cwd = '\0';
term = getenv("TERM");
if (term == NULL ||
strlcpy(data.term, term, sizeof data.term) >= sizeof data.term)
*data.term = '\0';
if ((fd = dup(STDIN_FILENO)) == -1)
fatal("dup failed");
imsg_compose(&client_ibuf,
MSG_IDENTIFY, PROTOCOL_VERSION, -1, fd, &data, sizeof data);
if ((fd = dup(STDOUT_FILENO)) == -1)
fatal("dup failed");
imsg_compose(&client_ibuf, MSG_STDOUT, PROTOCOL_VERSION, -1, fd, NULL, 0);
if ((fd = dup(STDERR_FILENO)) == -1)
fatal("dup failed");
imsg_compose(&client_ibuf, MSG_STDERR, PROTOCOL_VERSION, -1, fd, NULL, 0);
}
void
client_send_environ(void)
{
struct msg_environ_data data;
char **var;
for (var = environ; *var != NULL; var++) {
if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
continue;
client_write_server(MSG_ENVIRON, &data, sizeof data);
}
}
void
client_write_server(enum msgtype type, void *buf, size_t len)
{
imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, -1, buf, len);
}
void
client_update_event(void)
{
short events;
event_del(&client_event);
events = EV_READ;
if (client_ibuf.w.queued > 0)
events |= EV_WRITE;
event_set(&client_event, client_ibuf.fd, events, client_callback, NULL);
event_add(&client_event, NULL);
}
__dead void
client_main(void)
{
logfile("client");
/* Note: event_init() has already been called. */
/* Set up signals. */
set_signals(client_signal);
/*
* Send a resize message immediately in case the terminal size has
* changed between the identify message to the server and the MSG_READY
* telling us to move into the client code.
*/
client_write_server(MSG_RESIZE, NULL, 0);
/*
* imsg_read in the first client poll loop (before the terminal has
* been initialised) may have read messages into the buffer after the
* MSG_READY switched to here. Process anything outstanding now to
* avoid hanging waiting for messages that have already arrived.
*/
if (client_dispatch() != 0)
goto out;
/* Set the event and dispatch. */
client_update_event();
event_dispatch();
out:
/* Print the exit message, if any, and exit. */
if (client_exitmsg != NULL && !login_shell)
printf("[%s]\n", client_exitmsg);
exit(client_exitval);
}
/* ARGSUSED */
void
client_signal(int sig, unused short events, unused void *data)
{
struct sigaction sigact;
switch (sig) {
case SIGHUP:
client_exitmsg = "lost tty";
client_exitval = 1;
client_write_server(MSG_EXITING, NULL, 0);
break;
case SIGTERM:
client_exitmsg = "terminated";
client_exitval = 1;
client_write_server(MSG_EXITING, NULL, 0);
break;
case SIGWINCH:
client_write_server(MSG_RESIZE, NULL, 0);
break;
case SIGCONT:
memset(&sigact, 0, sizeof sigact);
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigact.sa_handler = SIG_IGN;
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
fatal("sigaction failed");
client_write_server(MSG_WAKEUP, NULL, 0);
break;
}
client_update_event();
}
/* ARGSUSED */
void
client_callback(unused int fd, short events, unused void *data)
{
ssize_t n;
if (events & EV_READ) {
if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
goto lost_server;
if (client_dispatch() != 0) {
event_loopexit(NULL);
return;
}
}
if (events & EV_WRITE) {
if (msgbuf_write(&client_ibuf.w) < 0)
goto lost_server;
}
client_update_event();
return;
lost_server:
client_exitmsg = "lost server";
client_exitval = 1;
event_loopexit(NULL);
}
int
client_dispatch(void)
{
struct imsg imsg;
struct msg_lock_data lockdata;
struct sigaction sigact;
ssize_t n, datalen;
for (;;) {
if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
fatalx("imsg_get failed");
if (n == 0)
return (0);
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
log_debug("client got %d", imsg.hdr.type);
switch (imsg.hdr.type) {
case MSG_DETACH:
if (datalen != 0)
fatalx("bad MSG_DETACH size");
client_write_server(MSG_EXITING, NULL, 0);
client_exitmsg = "detached";
break;
case MSG_EXIT:
if (datalen != 0 &&
datalen != sizeof (struct msg_exit_data))
fatalx("bad MSG_EXIT size");
client_write_server(MSG_EXITING, NULL, 0);
client_exitmsg = "exited";
break;
case MSG_EXITED:
if (datalen != 0)
fatalx("bad MSG_EXITED size");
imsg_free(&imsg);
return (-1);
case MSG_SHUTDOWN:
if (datalen != 0)
fatalx("bad MSG_SHUTDOWN size");
client_write_server(MSG_EXITING, NULL, 0);
client_exitmsg = "server exited";
client_exitval = 1;
break;
case MSG_SUSPEND:
if (datalen != 0)
fatalx("bad MSG_SUSPEND size");
memset(&sigact, 0, sizeof sigact);
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = SA_RESTART;
sigact.sa_handler = SIG_DFL;
if (sigaction(SIGTSTP, &sigact, NULL) != 0)
fatal("sigaction failed");
kill(getpid(), SIGTSTP);
break;
case MSG_LOCK:
if (datalen != sizeof lockdata)
fatalx("bad MSG_LOCK size");
memcpy(&lockdata, imsg.data, sizeof lockdata);
lockdata.cmd[(sizeof lockdata.cmd) - 1] = '\0';
system(lockdata.cmd);
client_write_server(MSG_UNLOCK, NULL, 0);
break;
default:
fatalx("unexpected message");
}
imsg_free(&imsg);
}
}