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Once we've set up termios, lines need to be \r\n terminated, and we need
to reset termios before exiting. So add custom versions of err(),
errx(), warn(), warnx() to handle this.

/* $OpenBSD: command.c,v 1.6 2012/07/10 10:28:05 nicm Exp $ */

/*
 * Copyright (c) 2012 Nicholas Marriott <nicm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/wait.h>

#include <event.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include "cu.h"

void	pipe_command(void);
void	connect_command(void);
void	send_file(void);

void
pipe_command(void)
{
	const char	*cmd;
	pid_t		 pid;
	int		 fd;

	cmd = get_input("Local command?");
	if (cmd == NULL || *cmd == '\0')
		return;

	restore_termios();

	switch (pid = fork()) {
	case -1:
		cu_err(1, "fork");
	case 0:
		fd = open(_PATH_DEVNULL, O_RDWR);
		if (fd < 0 || dup2(fd, STDIN_FILENO) == -1)
			_exit(1);
		close(fd);

		if (signal(SIGINT, SIG_DFL) == SIG_ERR)
			_exit(1);
		if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
			_exit(1);

		/* attach stdout to line */
		if (dup2(line_fd, STDOUT_FILENO) == -1)
			_exit(1);

		if (closefrom(STDERR_FILENO + 1) != 0)
			_exit(1);

		execl(_PATH_BSHELL, "sh", "-c", cmd, (void*)NULL);
		_exit(1);
	default:
		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
			/* nothing */;
		break;
	}

	set_termios();
}

void
connect_command(void)
{
	const char	*cmd;
	pid_t		 pid;

	/*
	 * Fork a program with:
	 *  0 <-> remote tty in
	 *  1 <-> remote tty out
	 *  2 <-> local tty stderr
	 */

	cmd = get_input("Local command?");
	if (cmd == NULL || *cmd == '\0')
		return;

	restore_termios();

	switch (pid = fork()) {
	case -1:
		cu_err(1, "fork");
	case 0:
		if (signal(SIGINT, SIG_DFL) == SIG_ERR)
			_exit(1);
		if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
			_exit(1);

		/* attach stdout and stdin to line */
		if (dup2(line_fd, STDOUT_FILENO) == -1)
			_exit(1);
		if (dup2(line_fd, STDIN_FILENO) == -1)
			_exit(1);

		if (closefrom(STDERR_FILENO + 1) != 0)
			_exit(1);

		execl(_PATH_BSHELL, "sh", "-c", cmd, (void*)NULL);
		_exit(1);
	default:
		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
			/* nothing */;
		break;
	}

	set_termios();
}

void
send_file(void)
{
	const char	*file;
	FILE		*f;
	char		 buf[BUFSIZ], *expanded;
	size_t		 len;

	file = get_input("Local file?");
	if (file == NULL || *file == '\0')
		return;

	expanded = tilde_expand(file);
	f = fopen(expanded, "r");
	if (f == NULL) {
		cu_warn("%s", file);
		return;
	}

	while (!feof(f) && !ferror(f)) {
		len = fread(buf, 1, sizeof(buf), f);
		if (len != 0)
			bufferevent_write(line_ev, buf, len);
	}

	fclose(f);
	free(expanded);
}

void
set_speed(void)
{
	const char	*s, *errstr;
	int		 speed;

	s = get_input("New speed?");
	if (s == NULL || *s == '\0')
		return;

	speed = strtonum(s, 0, UINT_MAX, &errstr);
	if (errstr != NULL) {
		cu_warnx("speed is %s: %s", errstr, s);
		return;
	}

	if (set_line(speed) != 0)
		cu_warn("tcsetattr");
}

void
do_command(char c)
{
	switch (c) {
	case '.':
	case '\004': /* ^D */
		event_loopexit(NULL);
		break;
	case '\032': /* ^Z */
		restore_termios();
		kill(getpid(), SIGTSTP);
		set_termios();
		break;
	case 'C':
		connect_command();
		break;
	case 'S':
		set_speed();
		break;
	case '$':
		pipe_command();
		break;
	case '>':
		send_file();
		break;
	case '#':
		ioctl(line_fd, TIOCSBRK, NULL);
		sleep(1);
		ioctl(line_fd, TIOCCBRK, NULL);
		break;
	case '?':
		printf("\r\n"
		    "~#      send break\r\n"
		    "~$      pipe local command to remote host\r\n"
		    "~>      send file to remote host\r\n"
		    "~C      connect program to remote host\r\n"
		    "~S      set speed\r\n"
		    "~?      get this summary\r\n"
		);
		break;
	}
}