tmate/client.c

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/* $Id: client.c,v 1.71 2009-09-20 22:11:27 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/ioctl.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 <fcntl.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "tmux.h"
void client_send_environ(struct client_ctx *);
void client_handle_winch(struct client_ctx *);
int
client_init(char *path, struct client_ctx *cctx, int cmdflags, int flags)
{
struct sockaddr_un sa;
struct stat sb;
struct msg_identify_data data;
struct winsize ws;
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size_t size;
int fd, fd2, mode;
char *name, *term;
#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
if (lstat(path, &sb) != 0) {
if (cmdflags & CMD_STARTSERVER && errno == ENOENT) {
if ((fd = server_start(path)) == -1)
goto start_failed;
goto server_started;
}
goto not_found;
}
if (!S_ISSOCK(sb.st_mode)) {
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errno = ENOTSOCK;
goto not_found;
}
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 (errno == ECONNREFUSED) {
if (unlink(path) != 0 || !(cmdflags & CMD_STARTSERVER))
goto not_found;
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");
imsg_init(&cctx->ibuf, fd);
if (cmdflags & CMD_SENDENVIRON)
client_send_environ(cctx);
if (isatty(STDIN_FILENO)) {
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if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
fatal("ioctl(TIOCGWINSZ)");
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data.flags = flags;
data.sx = ws.ws_col;
data.sy = ws.ws_row;
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if (getcwd(data.cwd, sizeof data.cwd) == NULL)
*data.cwd = '\0';
*data.term = '\0';
if ((term = getenv("TERM")) != NULL) {
if (strlcpy(data.term,
term, sizeof data.term) >= sizeof data.term)
*data.term = '\0';
}
*data.tty = '\0';
if ((name = ttyname(STDIN_FILENO)) == NULL)
fatal("ttyname failed");
if (strlcpy(data.tty, name, sizeof data.tty) >= sizeof data.tty)
fatalx("ttyname failed");
fd2 = dup(STDIN_FILENO);
imsg_compose(&cctx->ibuf, MSG_IDENTIFY,
PROTOCOL_VERSION, -1, fd2, &data, sizeof data);
}
return (0);
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start_failed:
log_warnx("server failed to start");
return (1);
not_found:
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log_warn("server not found");
return (1);
}
void
client_send_environ(struct client_ctx *cctx)
{
char **var;
struct msg_environ_data data;
for (var = environ; *var != NULL; var++) {
if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var)
continue;
client_write_server(cctx, MSG_ENVIRON, &data, sizeof data);
}
}
int
client_main(struct client_ctx *cctx)
{
struct pollfd pfd;
int n, nfds;
siginit();
logfile("client");
/*
* imsg_read in the first client poll loop (before the terminal has
* been initialiased) may have read messages into the buffer after the
* MSG_READY switched to here. Process anything outstanding now so poll
* doesn't hang waiting for messages that have already arrived.
*/
if (client_msg_dispatch(cctx) != 0)
goto out;
for (;;) {
if (sigterm)
client_write_server(cctx, MSG_EXITING, NULL, 0);
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if (sigchld) {
waitpid(WAIT_ANY, NULL, WNOHANG);
sigchld = 0;
}
if (sigwinch)
client_handle_winch(cctx);
if (sigcont) {
siginit();
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client_write_server(cctx, MSG_WAKEUP, NULL, 0);
sigcont = 0;
}
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 ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) {
cctx->exittype = CCTX_DIED;
break;
}
if (client_msg_dispatch(cctx) != 0)
break;
}
if (pfd.revents & POLLOUT) {
if (msgbuf_write(&cctx->ibuf.w) < 0) {
cctx->exittype = CCTX_DIED;
break;
}
}
}
out:
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if (sigterm) {
printf("[terminated]\n");
return (1);
}
switch (cctx->exittype) {
case CCTX_DIED:
printf("[lost server]\n");
return (0);
case CCTX_SHUTDOWN:
printf("[server exited]\n");
return (0);
case CCTX_EXIT:
if (cctx->errstr != NULL) {
printf("[error: %s]\n", cctx->errstr);
return (1);
}
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printf("[exited]\n");
return (0);
case CCTX_DETACH:
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printf("[detached]\n");
return (0);
default:
printf("[unknown error]\n");
return (1);
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}
}
void
client_handle_winch(struct client_ctx *cctx)
{
struct msg_resize_data data;
struct winsize ws;
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1)
fatal("ioctl failed");
data.sx = ws.ws_col;
data.sy = ws.ws_row;
client_write_server(cctx, MSG_RESIZE, &data, sizeof data);
sigwinch = 0;
}
int
client_msg_dispatch(struct client_ctx *cctx)
{
struct imsg imsg;
struct msg_print_data printdata;
ssize_t n, datalen;
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_DETACH:
if (datalen != 0)
fatalx("bad MSG_DETACH size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->exittype = CCTX_DETACH;
break;
case MSG_ERROR:
if (datalen != sizeof printdata)
fatalx("bad MSG_ERROR size");
memcpy(&printdata, imsg.data, sizeof printdata);
printdata.msg[(sizeof printdata.msg) - 1] = '\0';
/* Error string used after exit message from server. */
cctx->errstr = xstrdup(printdata.msg);
imsg_free(&imsg);
return (-1);
case MSG_EXIT:
if (datalen != 0)
fatalx("bad MSG_EXIT size");
client_write_server(cctx, MSG_EXITING, NULL, 0);
cctx->exittype = CCTX_EXIT;
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(cctx, MSG_EXITING, NULL, 0);
cctx->exittype = CCTX_SHUTDOWN;
break;
case MSG_SUSPEND:
if (datalen != 0)
fatalx("bad MSG_SUSPEND size");
client_suspend();
break;
default:
fatalx("unexpected message");
}
imsg_free(&imsg);
}
}