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/* $OpenBSD: cmd-pipe-pane.c,v 1.54 2020/04/13 20:51:57 nicm Exp $ */
/*
* Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* 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/socket.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
/*
* Open pipe to redirect pane output. If already open, close first.
*/
static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *);
static void cmd_pipe_pane_read_callback(struct bufferevent *, void *);
static void cmd_pipe_pane_write_callback(struct bufferevent *, void *);
static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *);
const struct cmd_entry cmd_pipe_pane_entry = {
.name = "pipe-pane",
.alias = "pipep",
.args = { "IOot:", 0, 1 },
.usage = "[-IOo] " CMD_TARGET_PANE_USAGE " [command]",
.target = { 't', CMD_FIND_PANE, 0 },
.flags = CMD_AFTERHOOK,
.exec = cmd_pipe_pane_exec
};
static enum cmd_retval
cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item)
{
struct args *args = cmd_get_args(self);
struct cmd_find_state *target = cmdq_get_target(item);
struct client *tc = cmdq_get_target_client(item);
struct window_pane *wp = target->wp;
struct session *s = target->s;
struct winlink *wl = target->wl;
char *cmd;
int old_fd, pipe_fd[2], null_fd, in, out;
struct format_tree *ft;
sigset_t set, oldset;
/* Destroy the old pipe. */
old_fd = wp->pipe_fd;
if (wp->pipe_fd != -1) {
bufferevent_free(wp->pipe_event);
close(wp->pipe_fd);
wp->pipe_fd = -1;
if (window_pane_destroy_ready(wp)) {
server_destroy_pane(wp, 1);
return (CMD_RETURN_NORMAL);
}
}
/* If no pipe command, that is enough. */
if (args->argc == 0 || *args->argv[0] == '\0')
return (CMD_RETURN_NORMAL);
/*
* With -o, only open the new pipe if there was no previous one. This
* allows a pipe to be toggled with a single key, for example:
*
* bind ^p pipep -o 'cat >>~/output'
*/
if (args_has(args, 'o') && old_fd != -1)
return (CMD_RETURN_NORMAL);
/* What do we want to do? Neither -I or -O is -O. */
if (args_has(args, 'I')) {
in = 1;
out = args_has(args, 'O');
} else {
in = 0;
out = 1;
}
/* Open the new pipe. */
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) {
cmdq_error(item, "socketpair error: %s", strerror(errno));
return (CMD_RETURN_ERROR);
}
/* Expand the command. */
ft = format_create(cmdq_get_client(item), item, FORMAT_NONE, 0);
format_defaults(ft, tc, s, wl, wp);
cmd = format_expand_time(ft, args->argv[0]);
format_free(ft);
/* Fork the child. */
sigfillset(&set);
sigprocmask(SIG_BLOCK, &set, &oldset);
switch (fork()) {
case -1:
sigprocmask(SIG_SETMASK, &oldset, NULL);
cmdq_error(item, "fork error: %s", strerror(errno));
free(cmd);
return (CMD_RETURN_ERROR);
case 0:
/* Child process. */
proc_clear_signals(server_proc, 1);
sigprocmask(SIG_SETMASK, &oldset, NULL);
close(pipe_fd[0]);
null_fd = open(_PATH_DEVNULL, O_WRONLY, 0);
if (out) {
if (dup2(pipe_fd[1], STDIN_FILENO) == -1)
_exit(1);
} else {
if (dup2(null_fd, STDIN_FILENO) == -1)
_exit(1);
}
if (in) {
if (dup2(pipe_fd[1], STDOUT_FILENO) == -1)
_exit(1);
if (pipe_fd[1] != STDOUT_FILENO)
close(pipe_fd[1]);
} else {
if (dup2(null_fd, STDOUT_FILENO) == -1)
_exit(1);
}
if (dup2(null_fd, STDERR_FILENO) == -1)
_exit(1);
closefrom(STDERR_FILENO + 1);
execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL);
_exit(1);
default:
/* Parent process. */
sigprocmask(SIG_SETMASK, &oldset, NULL);
close(pipe_fd[1]);
wp->pipe_fd = pipe_fd[0];
if (wp->fd != -1)
wp->pipe_off = EVBUFFER_LENGTH(wp->event->input);
else
wp->pipe_off = 0;
setblocking(wp->pipe_fd, 0);
wp->pipe_event = bufferevent_new(wp->pipe_fd,
cmd_pipe_pane_read_callback,
cmd_pipe_pane_write_callback,
cmd_pipe_pane_error_callback,
wp);
if (wp->pipe_event == NULL)
fatalx("out of memory");
if (out)
bufferevent_enable(wp->pipe_event, EV_WRITE);
if (in)
bufferevent_enable(wp->pipe_event, EV_READ);
free(cmd);
return (CMD_RETURN_NORMAL);
}
}
static void
cmd_pipe_pane_read_callback(__unused struct bufferevent *bufev, void *data)
{
struct window_pane *wp = data;
struct evbuffer *evb = wp->pipe_event->input;
size_t available;
available = EVBUFFER_LENGTH(evb);
log_debug("%%%u pipe read %zu", wp->id, available);
bufferevent_write(wp->event, EVBUFFER_DATA(evb), available);
evbuffer_drain(evb, available);
if (window_pane_destroy_ready(wp))
server_destroy_pane(wp, 1);
}
static void
cmd_pipe_pane_write_callback(__unused struct bufferevent *bufev, void *data)
{
struct window_pane *wp = data;
log_debug("%%%u pipe empty", wp->id);
if (window_pane_destroy_ready(wp))
server_destroy_pane(wp, 1);
}
static void
cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev,
__unused short what, void *data)
{
struct window_pane *wp = data;
log_debug("%%%u pipe error", wp->id);
bufferevent_free(wp->pipe_event);
close(wp->pipe_fd);
wp->pipe_fd = -1;
if (window_pane_destroy_ready(wp))
server_destroy_pane(wp, 1);
}
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