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tmux/tmux.c

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/* $Id: tmux.c,v 1.2 2007-07-25 23:13:18 nicm 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/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <getopt.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
#ifdef DEBUG
const char *malloc_options = "AFGJPX";
#endif
int connect_server(void);
int process_server(struct buffer *);
int process_local(struct buffer *, struct buffer *);
void sighandler(int);
__dead void usage(void);
__dead void main_list(char *);
void process_list(struct buffer *, const char *);
/* SIGWINCH received flag. */
volatile sig_atomic_t sigwinch;
/* SIGTERM received flag. */
volatile sig_atomic_t sigterm;
/* Debug output level. */
int debug_level;
/* Path to server socket. */
char socket_path[MAXPATHLEN];
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-v] [-n name] [-s path]\n", __progname);
exit(1);
}
void
sighandler(int sig)
{
switch (sig) {
case SIGWINCH:
sigwinch = 1;
break;
case SIGTERM:
sigterm = 1;
break;
case SIGCHLD:
waitpid(WAIT_ANY, NULL, WNOHANG);
break;
}
}
int
main(int argc, char **argv)
{
int opt, srv_fd, loc_fd, mode, listf, n;
char *path, name[MAXNAMELEN];
FILE *f;
struct buffer *srv_in, *srv_out, *loc_in, *loc_out;
struct pollfd pfds[2];
struct hdr hdr;
struct identify_data id;
struct size_data sd;
struct winsize ws;
struct sigaction act;
struct stat sb;
*name = '\0';
path = NULL;
listf = 0;
while ((opt = getopt(argc, argv, "ln:s:v?")) != EOF) {
switch (opt) {
case 'l':
listf = 1;
break;
case 'n':
if (strlcpy(name, optarg, sizeof name) >= sizeof name)
errx(1, "name too long");
break;
case 's':
path = xstrdup(optarg);
break;
case 'v':
debug_level++;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
/* Sort out socket path. */
if (path == NULL) {
xasprintf(&path,
"%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
}
if (realpath(path, socket_path) == NULL)
err(1, "realpath");
xfree(path);
/* Skip to list function if listing. */
if (listf) {
if (*name == '\0')
main_list(NULL);
else
main_list(name);
}
/* And fill name. */
if (*name == '\0')
xsnprintf(name, sizeof name, "s-%lu", (u_long) getpid());
/* Check stdin/stdout. */
if (!isatty(STDIN_FILENO))
errx(1, "stdin is not a tty");
if (!isatty(STDOUT_FILENO))
errx(1, "stdout is not a tty");
/* Set up signal handlers. */
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
act.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGUSR1, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGUSR2, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGINT, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGTSTP, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGQUIT, &act, NULL) != 0)
err(1, "sigaction");
act.sa_handler = sighandler;
if (sigaction(SIGWINCH, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGTERM, &act, NULL) != 0)
err(1, "sigaction");
if (sigaction(SIGCHLD, &act, NULL) != 0)
err(1, "sigaction");
/* Start server if necessary. */
if (stat(socket_path, &sb) != 0) {
if (errno != ENOENT)
err(1, "%s", socket_path);
else {
if (server_start() != 0)
errx(1, "couldn't start server");
sleep(1);
}
} else {
if (!S_ISSOCK(sb.st_mode))
errx(1, "%s: not a socket", socket_path);
}
/* Connect to server. */
if ((srv_fd = connect_server()) == -1)
errx(1, "couldn't find server");
if ((mode = fcntl(srv_fd, F_GETFL)) == -1)
err(1, "fcntl");
if (fcntl(srv_fd, F_SETFL, mode|O_NONBLOCK) == -1)
err(1, "fcntl");
srv_in = buffer_create(BUFSIZ);
srv_out = buffer_create(BUFSIZ);
/* Find window size. */
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
err(1, "ioctl(TIOCGWINSZ)");
/* Send initial data. */
hdr.code = MSG_IDENTIFY;
hdr.size = sizeof id;
buffer_write(srv_out, &hdr, sizeof hdr);
strlcpy(id.name, name, sizeof id.name);
id.sx = ws.ws_col;
id.sy = ws.ws_row;
buffer_write(srv_out, &id, hdr.size);
/* Start logging to file. */
if (debug_level > 0) {
xasprintf(&path,
"%s-client-%ld.log", __progname, (long) getpid());
f = fopen(path, "w");
log_open(f, LOG_USER, debug_level);
xfree(path);
}
/* Initialise terminal. */
loc_fd = local_init(&loc_in, &loc_out);
setproctitle("client (%s)", name);
/* Main loop. */
n = 0;
while (!sigterm) {
/* Handle SIGWINCH if necessary. */
if (sigwinch) {
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
fatal("ioctl failed");
hdr.code = MSG_SIZE;
hdr.size = sizeof sd;
buffer_write(srv_out, &hdr, sizeof hdr);
sd.sx = ws.ws_col;
sd.sy = ws.ws_row;
buffer_write(srv_out, &sd, hdr.size);
sigwinch = 0;
}
/* Set up pollfds. */
pfds[0].fd = srv_fd;
pfds[0].events = POLLIN;
if (BUFFER_USED(srv_out) > 0)
pfds[0].events |= POLLOUT;
pfds[1].fd = loc_fd;
pfds[1].events = POLLIN;
if (BUFFER_USED(loc_out) > 0)
pfds[1].events |= POLLOUT;
/* Do the poll. */
if (poll(pfds, 2, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
/* Read/write from sockets. */
if (buffer_poll(&pfds[0], srv_in, srv_out) != 0)
goto server_dead;
if (buffer_poll(&pfds[1], loc_in, loc_out) != 0)
fatalx("lost local socket");
/* Output flushed; pause if requested. */
if (n)
usleep(750000);
/* Process any data. */
if ((n = process_server(srv_in)) == -1)
break;
if (process_local(loc_in, srv_out) == -1)
break;
}
local_done();
if (!sigterm)
printf("[detached]\n");
else
printf("[terminated]\n");
exit(0);
server_dead:
local_done();
printf("[lost server]\n");
exit(1);
}
/* Connect to server socket from PID. */
int
connect_server(void)
{
int fd;
struct sockaddr_un sa;
size_t sz;
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
sz = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
if (sz >= sizeof sa.sun_path) {
errno = ENAMETOOLONG;
return (-1);
}
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
return (-1);
if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1)
return (-1);
return (fd);
}
/* Handle data from server. */
int
process_server(struct buffer *srv_in)
{
struct hdr hdr;
for (;;) {
if (BUFFER_USED(srv_in) < sizeof hdr)
break;
memcpy(&hdr, BUFFER_OUT(srv_in), sizeof hdr);
if (BUFFER_USED(srv_in) < (sizeof hdr) + hdr.size)
break;
buffer_remove(srv_in, sizeof hdr);
switch (hdr.code) {
case MSG_OUTPUT:
local_output(srv_in, hdr.size);
break;
case MSG_PAUSE:
if (hdr.size != 0)
fatalx("bad MSG_PAUSE size");
return (1);
case MSG_EXIT:
return (-1);
}
}
return (0);
}
/* Handle data from local terminal. */
int
process_local(struct buffer *loc_in, struct buffer *srv_out)
{
struct buffer *b;
struct hdr hdr;
size_t size;
int n, key;
n = 0;
b = buffer_create(BUFSIZ);
while ((key = local_key(&size)) != KEYC_NONE) {
log_debug("key code: %d", key);
if (key == cmd_prefix) {
if ((key = local_key(NULL)) == KEYC_NONE) {
buffer_reverse_remove(loc_in, size);
break;
}
n = cmd_execute(key, srv_out);
break;
}
input_store8(b, '\e');
input_store16(b, (uint16_t) key);
}
if (BUFFER_USED(b) == 0) {
buffer_destroy(b);
return (n);
}
log_debug("transmitting %zu bytes of input", BUFFER_USED(b));
hdr.code = MSG_INPUT;
hdr.size = BUFFER_USED(b);
buffer_write(srv_out, &hdr, sizeof hdr);
buffer_write(srv_out, BUFFER_OUT(b), BUFFER_USED(b));
buffer_destroy(b);
return (n);
}
/* List sessions or windows. */
__dead void
main_list(char *name)
{
struct sessions_data sd;
struct windows_data wd;
int srv_fd, mode;
struct buffer *srv_in, *srv_out;
struct pollfd pfd;
struct hdr hdr;
/* Connect to server. */
if ((srv_fd = connect_server()) == -1)
errx(1, "couldn't find server");
if ((mode = fcntl(srv_fd, F_GETFL)) == -1)
err(1, "fcntl");
if (fcntl(srv_fd, F_SETFL, mode|O_NONBLOCK) == -1)
err(1, "fcntl");
srv_in = buffer_create(BUFSIZ);
srv_out = buffer_create(BUFSIZ);
/* Send query data. */
if (name == NULL) {
hdr.code = MSG_SESSIONS;
hdr.size = sizeof sd;
buffer_write(srv_out, &hdr, sizeof hdr);
buffer_write(srv_out, &sd, hdr.size);
} else {
hdr.code = MSG_WINDOWS;
hdr.size = sizeof wd;
buffer_write(srv_out, &hdr, sizeof hdr);
strlcpy(wd.name, name, sizeof wd.name);
buffer_write(srv_out, &wd, hdr.size);
}
/* Main loop. */
for (;;) {
/* Set up pollfd. */
pfd.fd = srv_fd;
pfd.events = POLLIN;
if (BUFFER_USED(srv_out) > 0)
pfd.events |= POLLOUT;
/* Do the poll. */
if (poll(&pfd, 1, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
err(1, "poll");
}
/* Read/write from sockets. */
if (buffer_poll(&pfd, srv_in, srv_out) != 0)
errx(1, "lost server");
/* Process data. */
process_list(srv_in, name);
}
}
void
process_list(struct buffer *srv_in, const char *name)
{
struct sessions_data sd;
struct sessions_entry se;
struct windows_data wd;
struct windows_entry we;
struct hdr hdr;
char *tim;
for (;;) {
if (BUFFER_USED(srv_in) < sizeof hdr)
break;
memcpy(&hdr, BUFFER_OUT(srv_in), sizeof hdr);
if (BUFFER_USED(srv_in) < (sizeof hdr) + hdr.size)
break;
buffer_remove(srv_in, sizeof hdr);
switch (hdr.code) {
case MSG_SESSIONS:
if (hdr.size < sizeof sd)
errx(1, "bad MSG_SESSIONS size");
buffer_read(srv_in, &sd, sizeof sd);
hdr.size -= sizeof sd;
if (sd.sessions == 0 && hdr.size == 0)
exit(0);
if (hdr.size < sd.sessions * sizeof se)
errx(1, "bad MSG_SESSIONS size");
while (sd.sessions-- > 0) {
buffer_read(srv_in, &se, sizeof se);
tim = ctime(&se.tim);
*strchr(tim, '\n') = '\0';
printf("%s: %u windows (created %s)\n",
se.name, se.windows, tim);
}
exit(0);
case MSG_WINDOWS:
if (hdr.size < sizeof wd)
errx(1, "bad MSG_WINDOWS size");
buffer_read(srv_in, &wd, sizeof wd);
hdr.size -= sizeof wd;
if (wd.windows == 0 && hdr.size == 0)
errx(1, "session \"%s\" not found", name);
if (hdr.size < wd.windows * sizeof we)
errx(1, "bad MSG_WINDOWS size");
while (wd.windows-- > 0) {
buffer_read(srv_in, &we, sizeof we);
if (*we.title != '\0') {
printf("%u: %s \"%s\" (%s)\n",
we.idx, we.name, we.title, we.tty);
} else {
printf("%u: %s (%s)\n",
we.idx, we.name, we.tty);
}
}
exit(0);
}
}
}
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