etherdump.cc revision 2566
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 29/* @file 30 * Simple object for creating a simple pcap style packet trace 31 */ 32 33#include <sys/time.h> 34 35#include <algorithm> 36#include <string> 37 38#include "base/misc.hh" 39#include "base/output.hh" 40#include "dev/etherdump.hh" 41#include "sim/builder.hh" 42#include "sim/root.hh" 43 44using std::string; 45 46EtherDump::EtherDump(const string &name, const string &file, int max) 47 : SimObject(name), stream(file.c_str()), maxlen(max) 48{ 49} 50 51#define DLT_EN10MB 1 // Ethernet (10Mb) 52#define TCPDUMP_MAGIC 0xa1b2c3d4 53#define PCAP_VERSION_MAJOR 2 54#define PCAP_VERSION_MINOR 4 55 56struct pcap_file_header { 57 uint32_t magic; 58 uint16_t version_major; 59 uint16_t version_minor; 60 int32_t thiszone; // gmt to local correction 61 uint32_t sigfigs; // accuracy of timestamps 62 uint32_t snaplen; // max length saved portion of each pkt 63 uint32_t linktype; // data link type (DLT_*) 64}; 65 66struct pcap_pkthdr { 67 uint32_t seconds; 68 uint32_t microseconds; 69 uint32_t caplen; // length of portion present 70 uint32_t len; // length this packet (off wire) 71}; 72 73void 74EtherDump::init() 75{ 76 curtime = time(NULL); 77 struct pcap_file_header hdr; 78 hdr.magic = TCPDUMP_MAGIC; 79 hdr.version_major = PCAP_VERSION_MAJOR; 80 hdr.version_minor = PCAP_VERSION_MINOR; 81 82 hdr.thiszone = -5 * 3600; 83 hdr.snaplen = 1500; 84 hdr.sigfigs = 0; 85 hdr.linktype = DLT_EN10MB; 86 87 stream.write(reinterpret_cast<char *>(&hdr), sizeof(hdr)); 88 89 /* 90 * output an empty packet with the current time so that we know 91 * when the simulation began. This allows us to correlate packets 92 * to sim_cycles. 93 */ 94 pcap_pkthdr pkthdr; 95 pkthdr.seconds = curtime; 96 pkthdr.microseconds = 0; 97 pkthdr.caplen = 0; 98 pkthdr.len = 0; 99 stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 100 101 stream.flush(); 102} 103 104void 105EtherDump::dumpPacket(EthPacketPtr &packet) 106{ 107 pcap_pkthdr pkthdr; 108 pkthdr.seconds = curtime + (curTick / Clock::Int::s); 109 pkthdr.microseconds = (curTick / Clock::Int::us) % ULL(1000000); 110 pkthdr.caplen = std::min(packet->length, maxlen); 111 pkthdr.len = packet->length; 112 stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 113 stream.write(reinterpret_cast<char *>(packet->data), pkthdr.caplen); 114 stream.flush(); 115} 116 117BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherDump) 118 119 Param<string> file; 120 Param<int> maxlen; 121 122END_DECLARE_SIM_OBJECT_PARAMS(EtherDump) 123 124BEGIN_INIT_SIM_OBJECT_PARAMS(EtherDump) 125 126 INIT_PARAM(file, "file to dump packets to"), 127 INIT_PARAM(maxlen, "max portion of packet data to dump") 128 129END_INIT_SIM_OBJECT_PARAMS(EtherDump) 130 131CREATE_SIM_OBJECT(EtherDump) 132{ 133 return new EtherDump(getInstanceName(), simout.resolve(file), maxlen); 134} 135 136REGISTER_SIM_OBJECT("EtherDump", EtherDump) 137