etherdump.cc revision 5402
1/* 2 * Copyright (c) 2002-2005 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Nathan Binkert 29 */ 30 31/* @file 32 * Simple object for creating a simple pcap style packet trace 33 */ 34 35#include <sys/time.h> 36 37#include <algorithm> 38#include <string> 39 40#include "base/misc.hh" 41#include "base/output.hh" 42#include "dev/etherdump.hh" 43#include "sim/core.hh" 44 45using std::string; 46 47EtherDump::EtherDump(const Params *p) 48 : SimObject(p), stream(simout.create(p->file, true)), 49 maxlen(p->maxlen) 50{ 51} 52 53#define DLT_EN10MB 1 // Ethernet (10Mb) 54#define TCPDUMP_MAGIC 0xa1b2c3d4 55#define PCAP_VERSION_MAJOR 2 56#define PCAP_VERSION_MINOR 4 57 58struct pcap_file_header { 59 uint32_t magic; 60 uint16_t version_major; 61 uint16_t version_minor; 62 int32_t thiszone; // gmt to local correction 63 uint32_t sigfigs; // accuracy of timestamps 64 uint32_t snaplen; // max length saved portion of each pkt 65 uint32_t linktype; // data link type (DLT_*) 66}; 67 68struct pcap_pkthdr { 69 uint32_t seconds; 70 uint32_t microseconds; 71 uint32_t caplen; // length of portion present 72 uint32_t len; // length this packet (off wire) 73}; 74 75void 76EtherDump::init() 77{ 78 curtime = time(NULL); 79 struct pcap_file_header hdr; 80 hdr.magic = TCPDUMP_MAGIC; 81 hdr.version_major = PCAP_VERSION_MAJOR; 82 hdr.version_minor = PCAP_VERSION_MINOR; 83 84 hdr.thiszone = -5 * 3600; 85 hdr.snaplen = 1500; 86 hdr.sigfigs = 0; 87 hdr.linktype = DLT_EN10MB; 88 89 stream->write(reinterpret_cast<char *>(&hdr), sizeof(hdr)); 90 91 /* 92 * output an empty packet with the current time so that we know 93 * when the simulation began. This allows us to correlate packets 94 * to sim_cycles. 95 */ 96 pcap_pkthdr pkthdr; 97 pkthdr.seconds = curtime; 98 pkthdr.microseconds = 0; 99 pkthdr.caplen = 0; 100 pkthdr.len = 0; 101 stream->write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 102 103 stream->flush(); 104} 105 106void 107EtherDump::dumpPacket(EthPacketPtr &packet) 108{ 109 pcap_pkthdr pkthdr; 110 pkthdr.seconds = curtime + (curTick / Clock::Int::s); 111 pkthdr.microseconds = (curTick / Clock::Int::us) % ULL(1000000); 112 pkthdr.caplen = std::min(packet->length, maxlen); 113 pkthdr.len = packet->length; 114 stream->write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 115 stream->write(reinterpret_cast<char *>(packet->data), pkthdr.caplen); 116 stream->flush(); 117} 118 119EtherDump * 120EtherDumpParams::create() 121{ 122 return new EtherDump(this); 123} 124