/* $OpenBSD$ */

/*
* Copyright (c) 2009 Nicholas Marriott <[email protected]>
*
* 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 <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, NULL },
       .usage = "[-IOo] " CMD_TARGET_PANE_USAGE " [shell-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;
       struct window_pane_offset       *wpo = &wp->pipe_offset;
       char                            *cmd;
       int                              old_fd, pipe_fd[2], null_fd, in, out;
       struct format_tree              *ft;
       sigset_t                         set, oldset;

       /* Do nothing if pane is dead. */
       if (window_pane_exited(wp)) {
               cmdq_error(item, "target pane has exited");
               return (CMD_RETURN_ERROR);
       }

       /* 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_count(args) == 0 || *args_string(args, 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_string(args, 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);
               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];
               memcpy(wpo, &wp->offset, sizeof *wpo);

               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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