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/****************************************************************************
* netutils/pppd/chat.c
*
* Copyright (C) 2015 Max Nekludov. All rights reserved.
* Author: Max Nekludov <macscomp@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include "ppp_conf.h"
#include "ppp_arch.h"
#include "chat.h"
#include <poll.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define CHAT_MAX_SKIP 8
#define CHAT_ECHO_TIMEOUT 500
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: chat_read_byte
****************************************************************************/
static int chat_read_byte(int fd, char* c, int timeout)
{
int ret;
struct pollfd fds;
fds.fd = fd;
fds.events = POLLIN;
fds.revents = 0;
ret = poll(&fds, 1, timeout);
if (ret <= 0)
{
return -1;
}
ret = read(fd, c, 1);
if (ret != 1)
{
return -1;
}
printf("chat: char = %c (0x%02X)\n", *c, *c);
return 0;
}
/****************************************************************************
* Name: chat_flush
****************************************************************************/
static void chat_flush(int fd)
{
char tmp;
while (chat_read_byte(fd, &tmp, 0) == 0);
}
/****************************************************************************
* Name: chat_check_response
****************************************************************************/
static int chat_check_response(int fd, const char* response, int timeout)
{
char c;
int ret;
int skip = CHAT_MAX_SKIP;
while (*response)
{
ret = chat_read_byte(fd, &c, timeout);
if (ret < 0)
{
return ret;
}
if (skip > 0 && (c == '\r' || c == '\n'))
{
--skip;
continue;
}
if (c == *response)
{
++response;
}
else
{
return -1;
}
}
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ppp_chat
****************************************************************************/
int ppp_chat(int fd, struct chat_script_s *script, int echo)
{
int ret;
size_t len;
struct chat_line_s *line = script->lines;
const char* request = line->request;
const char* response = line->response;
while (request)
{
chat_flush(fd);
printf("chat: send '%s`\n", request);
len = strlen(request);
ret = write(fd, request, len);
if (ret < 0)
{
return ret;
}
else if ((size_t)ret != len)
{
return -1;
}
ret = write(fd, "\r\n", 2);
if (ret != 2)
{
return -1;
}
/* Check echo if enabled */
if (echo)
{
ret = chat_check_response(fd, request, CHAT_ECHO_TIMEOUT);
if (ret < 0)
{
printf("chat: invalid echo\n");
return ret;
}
}
if (response)
{
printf("chat: wait for '%s`\n", response);
ret = chat_check_response(fd, response, script->timeout * 1000);
if (ret < 0)
{
printf("chat: bad response\n");
return ret;
}
printf("chat: got it!\n");
}
++line;
request = line->request;
response = line->response;
}
return 0;
}
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