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Network/libpcap-1.9.0/rpcap-protocol.c 6.67 KB
1f9d795a   Speedclocker   Sniffer et sender
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  /*
   * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
   * Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
   * All rights reserved.
   *
   * 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 of the Politecnico di Torino, CACE Technologies
   * 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.
   *
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  
  #include <string.h>		/* for strlen(), ... */
  #include <stdlib.h>		/* for malloc(), free(), ... */
  #include <stdarg.h>		/* for functions with variable number of arguments */
  #include <errno.h>		/* for the errno variable */
  #include "sockutils.h"
  #include "portability.h"
  #include "rpcap-protocol.h"
  #include <pcap/pcap.h>
  
  /*
   * This file contains functions used both by the rpcap client and the
   * rpcap daemon.
   */
  
  /*
   * This function sends a RPCAP error to our peer.
   *
   * It has to be called when the main program detects an error.
   * It will send to our peer the 'buffer' specified by the user.
   * This function *does not* request a RPCAP CLOSE connection. A CLOSE
   * command must be sent explicitly by the program, since we do not know
   * whether the error can be recovered in some way or if it is a
   * non-recoverable one.
   *
   * \param sock: the socket we are currently using.
   *
   * \param ver: the protocol version we want to put in the reply.
   *
   * \param errcode: a integer which tells the other party the type of error
   * we had.
   *
   * \param error: an user-allocated (and '0' terminated) buffer that contains
   * the error description that has to be transmitted to our peer. The
   * error message cannot be longer than PCAP_ERRBUF_SIZE.
   *
   * \param errbuf: a pointer to a user-allocated buffer (of size
   * PCAP_ERRBUF_SIZE) that will contain the error message (in case there
   * is one). It could be network problem.
   *
   * \return '0' if everything is fine, '-1' if some errors occurred. The
   * error message is returned in the 'errbuf' variable.
   */
  int
  rpcap_senderror(SOCKET sock, uint8 ver, unsigned short errcode, const char *error, char *errbuf)
  {
  	char sendbuf[RPCAP_NETBUF_SIZE];	/* temporary buffer in which data to be sent is buffered */
  	int sendbufidx = 0;			/* index which keeps the number of bytes currently buffered */
  	uint16 length;
  
  	length = (uint16)strlen(error);
  
  	if (length > PCAP_ERRBUF_SIZE)
  		length = PCAP_ERRBUF_SIZE;
  
  	rpcap_createhdr((struct rpcap_header *) sendbuf, ver, RPCAP_MSG_ERROR, errcode, length);
  
  	if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, &sendbufidx,
  		RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, errbuf, PCAP_ERRBUF_SIZE))
  		return -1;
  
  	if (sock_bufferize(error, length, sendbuf, &sendbufidx,
  		RPCAP_NETBUF_SIZE, SOCKBUF_BUFFERIZE, errbuf, PCAP_ERRBUF_SIZE))
  		return -1;
  
  	if (sock_send(sock, sendbuf, sendbufidx, errbuf, PCAP_ERRBUF_SIZE) < 0)
  		return -1;
  
  	return 0;
  }
  
  /*
   * This function fills in a structure of type rpcap_header.
   *
   * It is provided just because the creation of an rpcap header is a common
   * task. It accepts all the values that appears into an rpcap_header, and
   * it puts them in place using the proper hton() calls.
   *
   * \param header: a pointer to a user-allocated buffer which will contain
   * the serialized header, ready to be sent on the network.
   *
   * \param ver: a value (in the host byte order) which will be placed into the
   * header.ver field and that represents the protocol version number of the
   * current message.
   *
   * \param type: a value (in the host byte order) which will be placed into the
   * header.type field and that represents the type of the current message.
   *
   * \param value: a value (in the host byte order) which will be placed into
   * the header.value field and that has a message-dependent meaning.
   *
   * \param length: a value (in the host by order) which will be placed into
   * the header.length field, representing the payload length of the message.
   *
   * \return Nothing. The serialized header is returned into the 'header'
   * variable.
   */
  void
  rpcap_createhdr(struct rpcap_header *header, uint8 ver, uint8 type, uint16 value, uint32 length)
  {
  	memset(header, 0, sizeof(struct rpcap_header));
  
  	header->ver = ver;
  	header->type = type;
  	header->value = htons(value);
  	header->plen = htonl(length);
  }
  
  /*
   * Convert a message type to a string containing the type name.
   */
  static const char *requests[] =
  {
  	NULL,				/* not a valid message type */
  	"RPCAP_MSG_ERROR",
  	"RPCAP_MSG_FINDALLIF_REQ",
  	"RPCAP_MSG_OPEN_REQ",
  	"RPCAP_MSG_STARTCAP_REQ",
  	"RPCAP_MSG_UPDATEFILTER_REQ",
  	"RPCAP_MSG_CLOSE",
  	"RPCAP_MSG_PACKET",
  	"RPCAP_MSG_AUTH_REQ",
  	"RPCAP_MSG_STATS_REQ",
  	"RPCAP_MSG_ENDCAP_REQ",
  	"RPCAP_MSG_SETSAMPLING_REQ",
  };
  #define NUM_REQ_TYPES	(sizeof requests / sizeof requests[0])
  
  static const char *replies[] =
  {
  	NULL,
  	NULL,			/* this would be a reply to RPCAP_MSG_ERROR */
  	"RPCAP_MSG_FINDALLIF_REPLY",
  	"RPCAP_MSG_OPEN_REPLY",
  	"RPCAP_MSG_STARTCAP_REPLY",
  	"RPCAP_MSG_UPDATEFILTER_REPLY",
  	NULL,			/* this would be a reply to RPCAP_MSG_CLOSE */
  	NULL,			/* this would be a reply to RPCAP_MSG_PACKET */
  	"RPCAP_MSG_AUTH_REPLY",
  	"RPCAP_MSG_STATS_REPLY",
  	"RPCAP_MSG_ENDCAP_REPLY",
  	"RPCAP_MSG_SETSAMPLING_REPLY",
  };
  #define NUM_REPLY_TYPES	(sizeof replies / sizeof replies[0])
  
  const char *
  rpcap_msg_type_string(uint8 type)
  {
  	if (type & RPCAP_MSG_IS_REPLY) {
  		type &= ~RPCAP_MSG_IS_REPLY;
  		if (type >= NUM_REPLY_TYPES)
  			return NULL;
  		return replies[type];
  	} else {
  		if (type >= NUM_REQ_TYPES)
  			return NULL;
  		return requests[type];
  	}
  }