196 lines
6.7 KiB
C
196 lines
6.7 KiB
C
/*
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* Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
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* Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino, CACE Technologies
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* nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <string.h> /* for strlen(), ... */
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#include <stdlib.h> /* for malloc(), free(), ... */
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#include <stdarg.h> /* for functions with variable number of arguments */
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#include <errno.h> /* for the errno variable */
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#include "sockutils.h"
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#include "portability.h"
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#include "rpcap-protocol.h"
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#include <pcap/pcap.h>
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/*
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* This file contains functions used both by the rpcap client and the
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* rpcap daemon.
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*/
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/*
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* This function sends a RPCAP error to our peer.
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*
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* It has to be called when the main program detects an error.
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* It will send to our peer the 'buffer' specified by the user.
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* This function *does not* request a RPCAP CLOSE connection. A CLOSE
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* command must be sent explicitly by the program, since we do not know
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* whether the error can be recovered in some way or if it is a
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* non-recoverable one.
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*
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* \param sock: the socket we are currently using.
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*
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* \param ver: the protocol version we want to put in the reply.
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*
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* \param errcode: a integer which tells the other party the type of error
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* we had.
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*
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* \param error: an user-allocated (and '0' terminated) buffer that contains
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* the error description that has to be transmitted to our peer. The
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* error message cannot be longer than PCAP_ERRBUF_SIZE.
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*
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* \param errbuf: a pointer to a user-allocated buffer (of size
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* PCAP_ERRBUF_SIZE) that will contain the error message (in case there
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* is one). It could be network problem.
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*
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* \return '0' if everything is fine, '-1' if some errors occurred. The
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* error message is returned in the 'errbuf' variable.
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*/
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int
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rpcap_senderror(SOCKET sock, uint8 ver, unsigned short errcode, const char *error, char *errbuf)
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{
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char sendbuf[RPCAP_NETBUF_SIZE]; /* temporary buffer in which data to be sent is buffered */
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int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */
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uint16 length;
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length = (uint16)strlen(error);
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if (length > PCAP_ERRBUF_SIZE)
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length = PCAP_ERRBUF_SIZE;
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rpcap_createhdr((struct rpcap_header *) sendbuf, ver, RPCAP_MSG_ERROR, errcode, length);
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if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, &sendbufidx,
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RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, errbuf, PCAP_ERRBUF_SIZE))
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return -1;
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if (sock_bufferize(error, length, sendbuf, &sendbufidx,
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RPCAP_NETBUF_SIZE, SOCKBUF_BUFFERIZE, errbuf, PCAP_ERRBUF_SIZE))
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return -1;
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if (sock_send(sock, sendbuf, sendbufidx, errbuf, PCAP_ERRBUF_SIZE) < 0)
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return -1;
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return 0;
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}
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/*
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* This function fills in a structure of type rpcap_header.
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*
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* It is provided just because the creation of an rpcap header is a common
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* task. It accepts all the values that appears into an rpcap_header, and
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* it puts them in place using the proper hton() calls.
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*
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* \param header: a pointer to a user-allocated buffer which will contain
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* the serialized header, ready to be sent on the network.
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*
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* \param ver: a value (in the host byte order) which will be placed into the
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* header.ver field and that represents the protocol version number of the
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* current message.
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*
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* \param type: a value (in the host byte order) which will be placed into the
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* header.type field and that represents the type of the current message.
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*
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* \param value: a value (in the host byte order) which will be placed into
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* the header.value field and that has a message-dependent meaning.
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*
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* \param length: a value (in the host by order) which will be placed into
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* the header.length field, representing the payload length of the message.
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*
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* \return Nothing. The serialized header is returned into the 'header'
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* variable.
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*/
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void
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rpcap_createhdr(struct rpcap_header *header, uint8 ver, uint8 type, uint16 value, uint32 length)
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{
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memset(header, 0, sizeof(struct rpcap_header));
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header->ver = ver;
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header->type = type;
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header->value = htons(value);
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header->plen = htonl(length);
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}
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/*
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* Convert a message type to a string containing the type name.
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*/
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static const char *requests[] =
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{
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NULL, /* not a valid message type */
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"RPCAP_MSG_ERROR",
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"RPCAP_MSG_FINDALLIF_REQ",
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"RPCAP_MSG_OPEN_REQ",
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"RPCAP_MSG_STARTCAP_REQ",
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"RPCAP_MSG_UPDATEFILTER_REQ",
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"RPCAP_MSG_CLOSE",
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"RPCAP_MSG_PACKET",
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"RPCAP_MSG_AUTH_REQ",
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"RPCAP_MSG_STATS_REQ",
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"RPCAP_MSG_ENDCAP_REQ",
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"RPCAP_MSG_SETSAMPLING_REQ",
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};
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#define NUM_REQ_TYPES (sizeof requests / sizeof requests[0])
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static const char *replies[] =
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{
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NULL,
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NULL, /* this would be a reply to RPCAP_MSG_ERROR */
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"RPCAP_MSG_FINDALLIF_REPLY",
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"RPCAP_MSG_OPEN_REPLY",
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"RPCAP_MSG_STARTCAP_REPLY",
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"RPCAP_MSG_UPDATEFILTER_REPLY",
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NULL, /* this would be a reply to RPCAP_MSG_CLOSE */
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NULL, /* this would be a reply to RPCAP_MSG_PACKET */
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"RPCAP_MSG_AUTH_REPLY",
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"RPCAP_MSG_STATS_REPLY",
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"RPCAP_MSG_ENDCAP_REPLY",
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"RPCAP_MSG_SETSAMPLING_REPLY",
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};
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#define NUM_REPLY_TYPES (sizeof replies / sizeof replies[0])
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const char *
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rpcap_msg_type_string(uint8 type)
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{
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if (type & RPCAP_MSG_IS_REPLY) {
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type &= ~RPCAP_MSG_IS_REPLY;
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if (type >= NUM_REPLY_TYPES)
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return NULL;
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return replies[type];
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} else {
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if (type >= NUM_REQ_TYPES)
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return NULL;
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return requests[type];
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}
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}
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