mirror of
https://github.com/tmux/tmux.git
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6b2129696f
name to all the pane pty names instead of comparing socket paths. This means that "new -d" will work without unsetting $TMUX.
702 lines
17 KiB
C
702 lines
17 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "tmux.h"
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struct imsgbuf client_ibuf;
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struct event client_event;
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struct event client_stdin;
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enum {
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CLIENT_EXIT_NONE,
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CLIENT_EXIT_DETACHED,
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CLIENT_EXIT_DETACHED_HUP,
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CLIENT_EXIT_LOST_TTY,
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CLIENT_EXIT_TERMINATED,
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CLIENT_EXIT_LOST_SERVER,
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CLIENT_EXIT_EXITED,
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CLIENT_EXIT_SERVER_EXITED,
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} client_exitreason = CLIENT_EXIT_NONE;
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int client_exitval;
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enum msgtype client_exittype;
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const char *client_exitsession;
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int client_attached;
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int client_get_lock(char *);
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int client_connect(char *, int);
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void client_send_identify(int);
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int client_write_one(enum msgtype, int, const void *, size_t);
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int client_write_server(enum msgtype, const void *, size_t);
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void client_update_event(void);
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void client_signal(int, short, void *);
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void client_stdin_callback(int, short, void *);
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void client_write(int, const char *, size_t);
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void client_callback(int, short, void *);
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int client_dispatch_attached(void);
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int client_dispatch_wait(void *);
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const char *client_exit_message(void);
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/*
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* Get server create lock. If already held then server start is happening in
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* another client, so block until the lock is released and return -1 to
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* retry. Ignore other errors - just continue and start the server without the
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* lock.
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*/
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int
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client_get_lock(char *lockfile)
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{
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int lockfd;
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if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1)
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fatal("open failed");
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log_debug("lock file is %s", lockfile);
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if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
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log_debug("flock failed: %s", strerror(errno));
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if (errno != EAGAIN)
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return (lockfd);
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while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
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/* nothing */;
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close(lockfd);
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return (-1);
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}
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log_debug("flock succeeded");
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return (lockfd);
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}
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/* Connect client to server. */
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int
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client_connect(char *path, int start_server)
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{
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struct sockaddr_un sa;
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size_t size;
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int fd, lockfd = -1, locked = 0;
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char *lockfile = NULL;
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memset(&sa, 0, sizeof sa);
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sa.sun_family = AF_UNIX;
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size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
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if (size >= sizeof sa.sun_path) {
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errno = ENAMETOOLONG;
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return (-1);
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}
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log_debug("socket is %s", path);
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retry:
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if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
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fatal("socket failed");
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log_debug("trying connect");
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if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
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log_debug("connect failed: %s", strerror(errno));
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if (errno != ECONNREFUSED && errno != ENOENT)
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goto failed;
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if (!start_server)
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goto failed;
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close(fd);
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if (!locked) {
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xasprintf(&lockfile, "%s.lock", path);
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if ((lockfd = client_get_lock(lockfile)) == -1) {
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log_debug("didn't get lock");
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free(lockfile);
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goto retry;
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}
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log_debug("got lock");
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/*
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* Always retry at least once, even if we got the lock,
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* because another client could have taken the lock,
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* started the server and released the lock between our
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* connect() and flock().
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*/
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locked = 1;
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goto retry;
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}
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if (unlink(path) != 0 && errno != ENOENT) {
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free(lockfile);
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close(lockfd);
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return (-1);
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}
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fd = server_start(lockfd, lockfile);
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}
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if (locked) {
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free(lockfile);
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close(lockfd);
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}
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setblocking(fd, 0);
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return (fd);
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failed:
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close(fd);
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return (-1);
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}
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/* Get exit string from reason number. */
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const char *
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client_exit_message(void)
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{
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static char msg[256];
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switch (client_exitreason) {
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case CLIENT_EXIT_NONE:
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break;
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case CLIENT_EXIT_DETACHED:
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if (client_exitsession != NULL) {
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xsnprintf(msg, sizeof msg, "detached "
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"(from session %s)", client_exitsession);
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return (msg);
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}
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return ("detached");
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case CLIENT_EXIT_DETACHED_HUP:
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if (client_exitsession != NULL) {
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xsnprintf(msg, sizeof msg, "detached and SIGHUP "
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"(from session %s)", client_exitsession);
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return (msg);
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}
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return ("detached and SIGHUP");
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case CLIENT_EXIT_LOST_TTY:
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return ("lost tty");
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case CLIENT_EXIT_TERMINATED:
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return ("terminated");
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case CLIENT_EXIT_LOST_SERVER:
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return ("lost server");
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case CLIENT_EXIT_EXITED:
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return ("exited");
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case CLIENT_EXIT_SERVER_EXITED:
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return ("server exited");
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}
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return ("unknown reason");
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}
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/* Client main loop. */
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int
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client_main(int argc, char **argv, int flags)
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{
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struct cmd *cmd;
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struct cmd_list *cmdlist;
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struct msg_command_data *data;
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int cmdflags, fd, i;
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pid_t ppid;
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enum msgtype msg;
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char *cause;
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struct termios tio, saved_tio;
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size_t size;
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/* Set up the initial command. */
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cmdflags = 0;
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if (shell_cmd != NULL) {
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msg = MSG_SHELL;
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cmdflags = CMD_STARTSERVER;
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} else if (argc == 0) {
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msg = MSG_COMMAND;
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cmdflags = CMD_STARTSERVER;
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} else {
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msg = MSG_COMMAND;
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/*
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* It sucks parsing the command string twice (in client and
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* later in server) but it is necessary to get the start server
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* flag.
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*/
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cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
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if (cmdlist == NULL) {
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fprintf(stderr, "%s\n", cause);
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return (1);
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}
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cmdflags &= ~CMD_STARTSERVER;
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TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
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if (cmd->entry->flags & CMD_STARTSERVER)
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cmdflags |= CMD_STARTSERVER;
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}
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cmd_list_free(cmdlist);
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}
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/* Set process title, log and signals now this is the client. */
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setproctitle("client (%s)", socket_path);
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logfile("client");
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/* Establish signal handlers. */
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set_signals(client_signal);
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/* Initialize the client socket and start the server. */
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fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
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if (fd == -1) {
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if (errno == ECONNREFUSED) {
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fprintf(stderr, "no server running on %s\n",
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socket_path);
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} else {
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fprintf(stderr, "error connecting to %s (%s)\n",
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socket_path, strerror(errno));
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}
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return (1);
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}
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/* Create imsg. */
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imsg_init(&client_ibuf, fd);
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event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
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/* Create stdin handler. */
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setblocking(STDIN_FILENO, 0);
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event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
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client_stdin_callback, NULL);
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if (flags & CLIENT_CONTROLCONTROL) {
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if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
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fprintf(stderr, "tcgetattr failed: %s\n",
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strerror(errno));
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return (1);
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}
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cfmakeraw(&tio);
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tio.c_iflag = ICRNL|IXANY;
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tio.c_oflag = OPOST|ONLCR;
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tio.c_lflag = NOKERNINFO;
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tio.c_cflag = CREAD|CS8|HUPCL;
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tio.c_cc[VMIN] = 1;
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tio.c_cc[VTIME] = 0;
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cfsetispeed(&tio, cfgetispeed(&saved_tio));
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cfsetospeed(&tio, cfgetospeed(&saved_tio));
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tcsetattr(STDIN_FILENO, TCSANOW, &tio);
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}
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/* Send identify messages. */
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client_send_identify(flags);
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/* Send first command. */
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if (msg == MSG_COMMAND) {
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/* How big is the command? */
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size = 0;
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for (i = 0; i < argc; i++)
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size += strlen(argv[i]) + 1;
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data = xmalloc((sizeof *data) + size);
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/* Prepare command for server. */
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data->argc = argc;
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if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
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fprintf(stderr, "command too long\n");
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free(data);
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return (1);
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}
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size += sizeof *data;
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/* Send the command. */
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if (client_write_server(msg, data, size) != 0) {
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fprintf(stderr, "failed to send command\n");
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free(data);
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return (1);
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}
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free(data);
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} else if (msg == MSG_SHELL)
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client_write_server(msg, NULL, 0);
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/* Set the event and dispatch. */
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client_update_event();
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event_dispatch();
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/* Print the exit message, if any, and exit. */
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if (client_attached) {
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if (client_exitreason != CLIENT_EXIT_NONE && !login_shell)
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printf("[%s]\n", client_exit_message());
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ppid = getppid();
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if (client_exittype == MSG_DETACHKILL && ppid > 1)
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kill(ppid, SIGHUP);
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} else if (flags & CLIENT_CONTROLCONTROL) {
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if (client_exitreason != CLIENT_EXIT_NONE)
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printf("%%exit %s\n", client_exit_message());
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else
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printf("%%exit\n");
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printf("\033\\");
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tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
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}
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setblocking(STDIN_FILENO, 1);
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return (client_exitval);
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}
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/* Send identify messages to server. */
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void
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client_send_identify(int flags)
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{
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const char *s;
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char **ss;
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int fd;
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client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
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if ((s = getenv("TERM")) == NULL)
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s = "";
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client_write_one(MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
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if ((s = ttyname(STDIN_FILENO)) == NULL)
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s = "";
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client_write_one(MSG_IDENTIFY_TTYNAME, -1, s, strlen(s) + 1);
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if ((fd = open(".", O_RDONLY)) == -1)
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fd = open("/", O_RDONLY);
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client_write_one(MSG_IDENTIFY_CWD, fd, NULL, 0);
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if ((fd = dup(STDIN_FILENO)) == -1)
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fatal("dup failed");
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client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
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for (ss = environ; *ss != NULL; ss++)
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client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, strlen(*ss) + 1);
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client_write_one(MSG_IDENTIFY_DONE, -1, NULL, 0);
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client_update_event();
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}
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/* Helper to send one message. */
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int
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client_write_one(enum msgtype type, int fd, const void *buf, size_t len)
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{
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int retval;
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retval = imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, fd,
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(void *)buf, len);
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if (retval != 1)
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return (-1);
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return (0);
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}
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/* Write a message to the server without a file descriptor. */
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int
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client_write_server(enum msgtype type, const void *buf, size_t len)
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{
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int retval;
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retval = client_write_one(type, -1, buf, len);
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if (retval == 0)
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client_update_event();
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return (retval);
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}
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/* Update client event based on whether it needs to read or read and write. */
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void
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client_update_event(void)
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{
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short events;
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event_del(&client_event);
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events = EV_READ;
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if (client_ibuf.w.queued > 0)
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events |= EV_WRITE;
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event_set(
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&client_event, client_ibuf.fd, events, client_callback, shell_cmd);
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event_add(&client_event, NULL);
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}
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/* Callback to handle signals in the client. */
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void
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client_signal(int sig, unused short events, unused void *data)
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{
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struct sigaction sigact;
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int status;
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if (sig == SIGCHLD)
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waitpid(WAIT_ANY, &status, WNOHANG);
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else if (!client_attached) {
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if (sig == SIGTERM)
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event_loopexit(NULL);
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} else {
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switch (sig) {
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case SIGHUP:
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client_exitreason = CLIENT_EXIT_LOST_TTY;
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGTERM:
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client_exitreason = CLIENT_EXIT_TERMINATED;
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client_exitval = 1;
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client_write_server(MSG_EXITING, NULL, 0);
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break;
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case SIGWINCH:
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client_write_server(MSG_RESIZE, NULL, 0);
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break;
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case SIGCONT:
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memset(&sigact, 0, sizeof sigact);
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = SA_RESTART;
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sigact.sa_handler = SIG_IGN;
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if (sigaction(SIGTSTP, &sigact, NULL) != 0)
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fatal("sigaction failed");
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client_write_server(MSG_WAKEUP, NULL, 0);
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break;
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}
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}
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client_update_event();
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}
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/* Callback for client imsg read events. */
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void
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client_callback(unused int fd, short events, void *data)
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{
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ssize_t n;
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int retval;
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if (events & EV_READ) {
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if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
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goto lost_server;
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if (client_attached)
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retval = client_dispatch_attached();
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else
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retval = client_dispatch_wait(data);
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if (retval != 0) {
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event_loopexit(NULL);
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return;
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}
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}
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if (events & EV_WRITE) {
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if (msgbuf_write(&client_ibuf.w) <= 0 && errno != EAGAIN)
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goto lost_server;
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}
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client_update_event();
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return;
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lost_server:
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client_exitreason = CLIENT_EXIT_LOST_SERVER;
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client_exitval = 1;
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event_loopexit(NULL);
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}
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/* Callback for client stdin read events. */
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void
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client_stdin_callback(unused int fd, unused short events, unused void *data1)
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{
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struct msg_stdin_data data;
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data.size = read(STDIN_FILENO, data.data, sizeof data.data);
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if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
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return;
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client_write_server(MSG_STDIN, &data, sizeof data);
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if (data.size <= 0)
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event_del(&client_stdin);
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client_update_event();
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}
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/* Force write to file descriptor. */
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void
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client_write(int fd, const char *data, size_t size)
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{
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ssize_t used;
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while (size != 0) {
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used = write(fd, data, size);
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if (used == -1) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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break;
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}
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data += used;
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size -= used;
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}
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}
|
|
|
|
/* Dispatch imsgs when in wait state (before MSG_READY). */
|
|
int
|
|
client_dispatch_wait(void *data0)
|
|
{
|
|
struct imsg imsg;
|
|
char *data;
|
|
ssize_t n, datalen;
|
|
struct msg_stdout_data stdoutdata;
|
|
struct msg_stderr_data stderrdata;
|
|
int retval;
|
|
|
|
for (;;) {
|
|
if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
|
|
fatalx("imsg_get failed");
|
|
if (n == 0)
|
|
return (0);
|
|
|
|
data = imsg.data;
|
|
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
|
|
|
|
log_debug("got %u from server", imsg.hdr.type);
|
|
switch (imsg.hdr.type) {
|
|
case MSG_EXIT:
|
|
case MSG_SHUTDOWN:
|
|
if (datalen != sizeof retval && datalen != 0)
|
|
fatalx("bad MSG_EXIT size");
|
|
if (datalen == sizeof retval) {
|
|
memcpy(&retval, data, sizeof retval);
|
|
client_exitval = retval;
|
|
}
|
|
imsg_free(&imsg);
|
|
return (-1);
|
|
case MSG_READY:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_READY size");
|
|
|
|
event_del(&client_stdin);
|
|
client_attached = 1;
|
|
client_write_server(MSG_RESIZE, NULL, 0);
|
|
break;
|
|
case MSG_STDIN:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_STDIN size");
|
|
|
|
event_add(&client_stdin, NULL);
|
|
break;
|
|
case MSG_STDOUT:
|
|
if (datalen != sizeof stdoutdata)
|
|
fatalx("bad MSG_STDOUT size");
|
|
memcpy(&stdoutdata, data, sizeof stdoutdata);
|
|
|
|
client_write(STDOUT_FILENO, stdoutdata.data,
|
|
stdoutdata.size);
|
|
break;
|
|
case MSG_STDERR:
|
|
if (datalen != sizeof stderrdata)
|
|
fatalx("bad MSG_STDERR size");
|
|
memcpy(&stderrdata, data, sizeof stderrdata);
|
|
|
|
client_write(STDERR_FILENO, stderrdata.data,
|
|
stderrdata.size);
|
|
break;
|
|
case MSG_VERSION:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_VERSION size");
|
|
|
|
fprintf(stderr, "protocol version mismatch "
|
|
"(client %d, server %u)\n", PROTOCOL_VERSION,
|
|
imsg.hdr.peerid);
|
|
client_exitval = 1;
|
|
|
|
imsg_free(&imsg);
|
|
return (-1);
|
|
case MSG_SHELL:
|
|
if (datalen == 0 || data[datalen - 1] != '\0')
|
|
fatalx("bad MSG_SHELL string");
|
|
|
|
clear_signals(0);
|
|
shell_exec(data, data0);
|
|
/* NOTREACHED */
|
|
case MSG_DETACH:
|
|
case MSG_DETACHKILL:
|
|
client_write_server(MSG_EXITING, NULL, 0);
|
|
break;
|
|
case MSG_EXITED:
|
|
imsg_free(&imsg);
|
|
return (-1);
|
|
}
|
|
|
|
imsg_free(&imsg);
|
|
}
|
|
}
|
|
|
|
/* Dispatch imsgs in attached state (after MSG_READY). */
|
|
int
|
|
client_dispatch_attached(void)
|
|
{
|
|
struct imsg imsg;
|
|
struct sigaction sigact;
|
|
char *data;
|
|
ssize_t n, datalen;
|
|
|
|
for (;;) {
|
|
if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
|
|
fatalx("imsg_get failed");
|
|
if (n == 0)
|
|
return (0);
|
|
|
|
data = imsg.data;
|
|
datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
|
|
|
|
log_debug("got %u from server", imsg.hdr.type);
|
|
switch (imsg.hdr.type) {
|
|
case MSG_DETACH:
|
|
case MSG_DETACHKILL:
|
|
if (datalen == 0 || data[datalen - 1] != '\0')
|
|
fatalx("bad MSG_DETACH string");
|
|
|
|
client_exitsession = xstrdup(data);
|
|
client_exittype = imsg.hdr.type;
|
|
if (imsg.hdr.type == MSG_DETACHKILL)
|
|
client_exitreason = CLIENT_EXIT_DETACHED_HUP;
|
|
else
|
|
client_exitreason = CLIENT_EXIT_DETACHED;
|
|
client_write_server(MSG_EXITING, NULL, 0);
|
|
break;
|
|
case MSG_EXIT:
|
|
if (datalen != 0 && datalen != sizeof (int))
|
|
fatalx("bad MSG_EXIT size");
|
|
|
|
client_write_server(MSG_EXITING, NULL, 0);
|
|
client_exitreason = CLIENT_EXIT_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_exitreason = CLIENT_EXIT_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 == 0 || data[datalen - 1] != '\0')
|
|
fatalx("bad MSG_LOCK string");
|
|
|
|
system(data);
|
|
client_write_server(MSG_UNLOCK, NULL, 0);
|
|
break;
|
|
}
|
|
|
|
imsg_free(&imsg);
|
|
}
|
|
}
|