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https://github.com/tmux/tmux.git
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688 lines
17 KiB
C
688 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 <imsg.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 tmuxproc *client_proc;
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struct tmuxpeer *client_peer;
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int client_flags;
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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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__dead void client_exec(const char *);
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int client_get_lock(char *);
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int client_connect(struct event_base *, char *, int);
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void client_send_identify(const char *, const char *);
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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_signal(int);
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void client_dispatch(struct imsg *, void *);
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void client_dispatch_attached(struct imsg *);
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void client_dispatch_wait(struct imsg *);
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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(struct event_base *base, 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, sizeof(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(base, 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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if (locked) {
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free(lockfile);
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close(lockfd);
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}
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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(struct event_base *base, 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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const char *ttynam, *cwd;
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pid_t ppid;
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enum msgtype msg;
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char *cause, path[PATH_MAX];
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struct termios tio, saved_tio;
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size_t size;
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/* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
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signal(SIGCHLD, SIG_IGN);
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/* Save the flags. */
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client_flags = flags;
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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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/* Initialize the client socket and start the server. */
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fd = client_connect(base, 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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/* Build process state. */
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client_proc = proc_start("client", base, 0, client_signal);
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client_peer = proc_add_peer(client_proc, fd, client_dispatch, NULL);
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/* Save these before pledge(). */
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if ((cwd = getcwd(path, sizeof path)) == NULL) {
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if ((cwd = find_home()) == NULL)
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cwd = "/";
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}
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if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
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ttynam = "";
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/*
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* Drop privileges for client. "proc exec" is needed for -c and for
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* locking (which uses system(3)).
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*
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* "tty" is needed to restore termios(4) and also for some reason -CC
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* does not work properly without it (input is not recognised).
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*
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* "sendfd" is dropped later in client_dispatch_wait().
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*/
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if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
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fatal("pledge failed");
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/* Free stuff that is not used in the client. */
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options_free(global_options);
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options_free(global_s_options);
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options_free(global_w_options);
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environ_free(global_environ);
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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 (client_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(ttynam, cwd);
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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 (proc_send(client_peer, msg, -1, 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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proc_send(client_peer, msg, -1, NULL, 0);
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/* Start main loop. */
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proc_loop(client_proc, NULL);
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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)
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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 (client_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(const char *ttynam, const char *cwd)
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{
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const char *s;
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char **ss;
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size_t sslen;
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int fd, flags = client_flags;
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pid_t pid;
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proc_send(client_peer, 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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proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
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proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam, strlen(ttynam) + 1);
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proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
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if ((fd = dup(STDIN_FILENO)) == -1)
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fatal("dup failed");
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proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
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pid = getpid();
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proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
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for (ss = environ; *ss != NULL; ss++) {
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sslen = strlen(*ss) + 1;
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if (sslen <= MAX_IMSGSIZE - IMSG_HEADER_SIZE)
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proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
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}
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proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
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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,
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__unused void *arg)
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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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proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
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if (data.size <= 0)
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event_del(&client_stdin);
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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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}
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/* Run command in shell; used for -c. */
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__dead void
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client_exec(const char *shell)
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{
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const char *name, *ptr;
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char *argv0;
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log_debug("shell %s, command %s", shell, shell_cmd);
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ptr = strrchr(shell, '/');
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if (ptr != NULL && *(ptr + 1) != '\0')
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name = ptr + 1;
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else
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name = shell;
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if (client_flags & CLIENT_LOGIN)
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xasprintf(&argv0, "-%s", name);
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else
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xasprintf(&argv0, "%s", name);
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setenv("SHELL", shell, 1);
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setblocking(STDIN_FILENO, 1);
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setblocking(STDOUT_FILENO, 1);
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setblocking(STDERR_FILENO, 1);
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closefrom(STDERR_FILENO + 1);
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execl(shell, argv0, "-c", shell_cmd, (char *) NULL);
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fatal("execl failed");
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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)
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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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proc_exit(client_proc);
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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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proc_send(client_peer, MSG_EXITING, -1, 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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proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
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break;
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case SIGWINCH:
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proc_send(client_peer, MSG_RESIZE, -1, 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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proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
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break;
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}
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}
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}
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/* Callback for client read events. */
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void
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client_dispatch(struct imsg *imsg, __unused void *arg)
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{
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if (imsg == NULL) {
|
|
client_exitreason = CLIENT_EXIT_LOST_SERVER;
|
|
client_exitval = 1;
|
|
} else if (client_attached)
|
|
client_dispatch_attached(imsg);
|
|
else
|
|
client_dispatch_wait(imsg);
|
|
}
|
|
|
|
/* Dispatch imsgs when in wait state (before MSG_READY). */
|
|
void
|
|
client_dispatch_wait(struct imsg *imsg)
|
|
{
|
|
char *data;
|
|
ssize_t datalen;
|
|
struct msg_stdout_data stdoutdata;
|
|
struct msg_stderr_data stderrdata;
|
|
int retval;
|
|
static int pledge_applied;
|
|
|
|
/*
|
|
* "sendfd" is no longer required once all of the identify messages
|
|
* have been sent. We know the server won't send us anything until that
|
|
* point (because we don't ask it to), so we can drop "sendfd" once we
|
|
* get the first message from the server.
|
|
*/
|
|
if (!pledge_applied) {
|
|
if (pledge("stdio unix proc exec tty", NULL) != 0)
|
|
fatal("pledge failed");
|
|
pledge_applied = 1;
|
|
};
|
|
|
|
data = imsg->data;
|
|
datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
|
|
|
|
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;
|
|
}
|
|
proc_exit(client_proc);
|
|
break;
|
|
case MSG_READY:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_READY size");
|
|
|
|
event_del(&client_stdin);
|
|
client_attached = 1;
|
|
proc_send(client_peer, MSG_RESIZE, -1, 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 & 0xff);
|
|
client_exitval = 1;
|
|
proc_exit(client_proc);
|
|
break;
|
|
case MSG_SHELL:
|
|
if (datalen == 0 || data[datalen - 1] != '\0')
|
|
fatalx("bad MSG_SHELL string");
|
|
|
|
clear_signals(0);
|
|
client_exec(data);
|
|
/* NOTREACHED */
|
|
case MSG_DETACH:
|
|
case MSG_DETACHKILL:
|
|
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
|
break;
|
|
case MSG_EXITED:
|
|
proc_exit(client_proc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Dispatch imsgs in attached state (after MSG_READY). */
|
|
void
|
|
client_dispatch_attached(struct imsg *imsg)
|
|
{
|
|
struct sigaction sigact;
|
|
char *data;
|
|
ssize_t datalen;
|
|
|
|
data = imsg->data;
|
|
datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
|
|
|
|
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;
|
|
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
|
break;
|
|
case MSG_EXIT:
|
|
if (datalen != 0 && datalen != sizeof (int))
|
|
fatalx("bad MSG_EXIT size");
|
|
|
|
proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
|
|
client_exitreason = CLIENT_EXIT_EXITED;
|
|
break;
|
|
case MSG_EXITED:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_EXITED size");
|
|
|
|
proc_exit(client_proc);
|
|
break;
|
|
case MSG_SHUTDOWN:
|
|
if (datalen != 0)
|
|
fatalx("bad MSG_SHUTDOWN size");
|
|
|
|
proc_send(client_peer, MSG_EXITING, -1, 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);
|
|
proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
|
|
break;
|
|
}
|
|
}
|