etherdump.cc revision 2
1/* 2 * Copyright (c) 2003 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 <string> 36 37#include "universe.hh" 38#include "etherdump.hh" 39#include "universe.hh" 40 41using std::string; 42 43EtherDump::EtherDump(const string &name, const string &file) 44 : SimObject(name) 45{ 46 if (!file.empty()) { 47 stream.open(file.c_str()); 48 if (stream.is_open()) 49 init(); 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 struct timeval ts; // time stamp 70 uint32_t caplen; // length of portion present 71 uint32_t len; // length this packet (off wire) 72}; 73 74void 75EtherDump::init() 76{ 77 curtime = time(NULL); 78 s_freq = ticksPerSecond; 79 us_freq = ticksPerSecond / ULL(1000000); 80 81 struct pcap_file_header hdr; 82 hdr.magic = TCPDUMP_MAGIC; 83 hdr.version_major = PCAP_VERSION_MAJOR; 84 hdr.version_minor = PCAP_VERSION_MINOR; 85 86 hdr.thiszone = -5 * 3600; 87 hdr.snaplen = 1500; 88 hdr.sigfigs = 0; 89 hdr.linktype = DLT_EN10MB; 90 91 stream.write(reinterpret_cast<char *>(&hdr), sizeof(hdr)); 92 93 /* 94 * output an empty packet with the current time so that we know 95 * when the simulation began. This allows us to correlate packets 96 * to sim_cycles. 97 */ 98 pcap_pkthdr pkthdr; 99 pkthdr.ts.tv_sec = curtime; 100 pkthdr.ts.tv_usec = 0; 101 pkthdr.caplen = 0; 102 pkthdr.len = 0; 103 stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 104 105 stream.flush(); 106} 107 108void 109EtherDump::dumpPacket(PacketPtr packet) 110{ 111 pcap_pkthdr pkthdr; 112 pkthdr.ts.tv_sec = curtime + (curTick / s_freq); 113 pkthdr.ts.tv_usec = (curTick / us_freq) % ULL(1000000); 114 pkthdr.caplen = packet->length; 115 pkthdr.len = packet->length; 116 stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); 117 stream.write(reinterpret_cast<char *>(packet->data), packet->length); 118 stream.flush(); 119} 120 121BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherDump) 122 123 Param<string> file; 124 125END_DECLARE_SIM_OBJECT_PARAMS(EtherDump) 126 127BEGIN_INIT_SIM_OBJECT_PARAMS(EtherDump) 128 129 INIT_PARAM_DFLT(file, "file to dump packets to", "") 130 131END_INIT_SIM_OBJECT_PARAMS(EtherDump) 132 133CREATE_SIM_OBJECT(EtherDump) 134{ 135 return new EtherDump(getInstanceName(), file); 136} 137 138REGISTER_SIM_OBJECT("EtherDump", EtherDump) 139