tmux/client.c

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/* $Id: client.c,v 1.9 2007-09-29 13:22:15 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 <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
void client_handle_winch(struct client_ctx *);
int client_process_local(struct client_ctx *, char **);
int
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client_init(char *path, struct client_ctx *cctx, int start_server)
{
struct sockaddr_un sa;
struct stat sb;
size_t sz;
int mode;
u_int retries;
if (path == NULL) {
xasprintf(&path,
"%s/%s-%lu", _PATH_TMP, __progname, (u_long) getuid());
}
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if (start_server) {
if (!isatty(STDIN_FILENO)) {
log_warnx("stdin is not a tty");
return (-1);
}
if (!isatty(STDOUT_FILENO)) {
log_warnx("stdout is not a tty");
return (-1);
}
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &cctx->ws) == -1) {
log_warn("ioctl(TIOCGWINSZ)");
return (-1);
}
}
retries = 0;
retry:
if (stat(path, &sb) != 0) {
if (start_server && errno == ENOENT && retries < 10) {
if (server_start(path) != 0)
return (-1);
usleep(10000);
retries++;
goto retry;
}
log_warn("%s: stat", path);
return (-1);
}
if (!S_ISSOCK(sb.st_mode)) {
log_warnx("%s: %s", path, strerror(ENOTSOCK));
return (-1);
}
memset(&sa, 0, sizeof sa);
sa.sun_family = AF_UNIX;
sz = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
if (sz >= sizeof sa.sun_path) {
log_warnx("%s: %s", path, strerror(ENAMETOOLONG));
return (-1);
}
if ((cctx->srv_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
log_warn("%s: socket", path);
return (-1);
}
if (connect(
cctx->srv_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
if (start_server && errno == ECONNREFUSED && retries < 10) {
if (unlink(path) != 0) {
log_warn("%s: unlink", path);
return (-1);
}
usleep(10000);
retries++;
goto retry;
}
log_warn("%s: connect", path);
return (-1);
}
if ((mode = fcntl(cctx->srv_fd, F_GETFL)) == -1) {
log_warn("%s: fcntl", path);
return (-1);
}
if (fcntl(cctx->srv_fd, F_SETFL, mode|O_NONBLOCK) == -1) {
log_warn("%s: fcntl", path);
return (-1);
}
cctx->srv_in = buffer_create(BUFSIZ);
cctx->srv_out = buffer_create(BUFSIZ);
return (0);
}
int
client_flush(struct client_ctx *cctx)
{
struct pollfd pfd;
struct hdr hdr;
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) {
log_warnx("lost server");
return (1);
}
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);
if (hdr.type == MSG_DONE)
return (0);
if (hdr.type == MSG_ERROR) {
if (hdr.size > INT_MAX - 1)
fatalx("bad MSG_ERROR size");
log_warnx(
"%.*s", (int) hdr.size, BUFFER_OUT(cctx->srv_in));
return (1);
}
fatalx("unexpected message");
}
}
int
client_main(struct client_ctx *cctx)
{
struct pollfd pfds[2];
char *error;
int n;
logfile("client");
setproctitle("client");
siginit();
if ((cctx->loc_fd = local_init(&cctx->loc_in, &cctx->loc_out)) == -1)
return (1);
n = 0;
error = NULL;
while (!sigterm) {
if (sigwinch)
client_handle_winch(cctx);
pfds[0].fd = cctx->srv_fd;
pfds[0].events = POLLIN;
if (BUFFER_USED(cctx->srv_out) > 0)
pfds[0].events |= POLLOUT;
pfds[1].fd = cctx->loc_fd;
pfds[1].events = POLLIN;
if (BUFFER_USED(cctx->loc_out) > 0)
pfds[1].events |= POLLOUT;
if (poll(pfds, 2, INFTIM) == -1) {
if (errno == EAGAIN || errno == EINTR)
continue;
fatal("poll failed");
}
if (buffer_poll(&pfds[0], cctx->srv_in, cctx->srv_out) != 0)
goto server_dead;
if (buffer_poll(&pfds[1], cctx->loc_in, cctx->loc_out) != 0)
goto local_dead;
/* XXX Output flushed; pause if required. */
if (n)
usleep(750000);
/* XXX XXX special return code for pause? or flag in cctx? */
if ((n = client_process_local(cctx, &error)) == -1)
break;
if ((n = client_msg_dispatch(cctx, &error)) == -1)
break;
}
local_done();
if (error != NULL) {
printf("[error: %s]\n", error);
return (1);
}
if (sigterm) {
printf("[terminated]\n");
return (1);
}
printf("[detached]\n");
return (0);
server_dead:
local_done();
printf("[lost server]\n");
return (1);
local_dead:
/* Can't do much here. Log and die. */
fatalx("local socket dead");
}
void
client_fill_sessid(struct sessid *sid, char name[MAXNAMELEN])
{
char *env, *ptr, buf[256];
const char *errstr;
long long ll;
strlcpy(sid->name, name, sizeof sid->name);
sid->pid = -1;
if ((env = getenv("TMUX")) == NULL)
return;
if ((ptr = strchr(env, ',')) == NULL)
return;
if ((size_t) (ptr - env) > sizeof buf)
return;
memcpy(buf, env, ptr - env);
buf[ptr - env] = '\0';
ll = strtonum(ptr + 1, 0, UINT_MAX, &errstr);
if (errstr != NULL)
return;
sid->idx = ll;
ll = strtonum(buf, 0, LLONG_MAX, &errstr);
if (errstr != NULL)
return;
sid->pid = ll;
}
void
client_write_server(
struct client_ctx *cctx, enum hdrtype type, void *buf, size_t len)
{
struct hdr hdr;
hdr.type = type;
hdr.size = len;
buffer_write(cctx->srv_out, &hdr, sizeof hdr);
if (len > 0)
buffer_write(cctx->srv_out, buf, len);
}
void
client_handle_winch(struct client_ctx *cctx)
{
struct size_data data;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &cctx->ws) == -1)
fatal("ioctl failed");
data.sx = cctx->ws.ws_col;
data.sy = cctx->ws.ws_row;
client_write_server(cctx, MSG_SIZE, &data, sizeof data);
sigwinch = 0;
}
int
client_process_local(struct client_ctx *cctx, char **error)
{
struct buffer *b;
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 == client_cmd_prefix) {
if ((key = local_key(NULL)) == KEYC_NONE) {
/* XXX sux */
buffer_reverse_remove(cctx->loc_in, size);
break;
}
n = client_cmd_dispatch(key, cctx, error);
break;
}
input_store8(b, '\e');
input_store16(b, (uint16_t) key /*XXX*/);
}
log_debug("transmitting %zu bytes of input", BUFFER_USED(b));
if (BUFFER_USED(b) == 0) {
buffer_destroy(b);
return (n);
}
client_write_server(cctx, MSG_INPUT, BUFFER_OUT(b), BUFFER_USED(b));
buffer_destroy(b);
return (n);
}