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Diffstat (limited to 'dev/etherdump.cc')
| -rw-r--r-- | dev/etherdump.cc | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/dev/etherdump.cc b/dev/etherdump.cc new file mode 100644 index 000000000..034db86aa --- /dev/null +++ b/dev/etherdump.cc @@ -0,0 +1,138 @@ +/* + * Copyright (c) 2003 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * 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; + * neither the name of the copyright holders 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. + */ + +/* @file + * Simple object for creating a simple pcap style packet trace + */ + +#include <sys/time.h> + +#include <string> + +#include "universe.hh" +#include "etherdump.hh" +#include "universe.hh" + +using std::string; + +EtherDump::EtherDump(const string &name, const string &file) + : SimObject(name) +{ + if (!file.empty()) { + stream.open(file.c_str()); + if (stream.is_open()) + init(); + } +} + +#define DLT_EN10MB 1 // Ethernet (10Mb) +#define TCPDUMP_MAGIC 0xa1b2c3d4 +#define PCAP_VERSION_MAJOR 2 +#define PCAP_VERSION_MINOR 4 + +struct pcap_file_header { + uint32_t magic; + uint16_t version_major; + uint16_t version_minor; + int32_t thiszone; // gmt to local correction + uint32_t sigfigs; // accuracy of timestamps + uint32_t snaplen; // max length saved portion of each pkt + uint32_t linktype; // data link type (DLT_*) +}; + +struct pcap_pkthdr { + struct timeval ts; // time stamp + uint32_t caplen; // length of portion present + uint32_t len; // length this packet (off wire) +}; + +void +EtherDump::init() +{ + curtime = time(NULL); + s_freq = ticksPerSecond; + us_freq = ticksPerSecond / ULL(1000000); + + struct pcap_file_header hdr; + hdr.magic = TCPDUMP_MAGIC; + hdr.version_major = PCAP_VERSION_MAJOR; + hdr.version_minor = PCAP_VERSION_MINOR; + + hdr.thiszone = -5 * 3600; + hdr.snaplen = 1500; + hdr.sigfigs = 0; + hdr.linktype = DLT_EN10MB; + + stream.write(reinterpret_cast<char *>(&hdr), sizeof(hdr)); + + /* + * output an empty packet with the current time so that we know + * when the simulation began. This allows us to correlate packets + * to sim_cycles. + */ + pcap_pkthdr pkthdr; + pkthdr.ts.tv_sec = curtime; + pkthdr.ts.tv_usec = 0; + pkthdr.caplen = 0; + pkthdr.len = 0; + stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); + + stream.flush(); +} + +void +EtherDump::dumpPacket(PacketPtr packet) +{ + pcap_pkthdr pkthdr; + pkthdr.ts.tv_sec = curtime + (curTick / s_freq); + pkthdr.ts.tv_usec = (curTick / us_freq) % ULL(1000000); + pkthdr.caplen = packet->length; + pkthdr.len = packet->length; + stream.write(reinterpret_cast<char *>(&pkthdr), sizeof(pkthdr)); + stream.write(reinterpret_cast<char *>(packet->data), packet->length); + stream.flush(); +} + +BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherDump) + + Param<string> file; + +END_DECLARE_SIM_OBJECT_PARAMS(EtherDump) + +BEGIN_INIT_SIM_OBJECT_PARAMS(EtherDump) + + INIT_PARAM_DFLT(file, "file to dump packets to", "") + +END_INIT_SIM_OBJECT_PARAMS(EtherDump) + +CREATE_SIM_OBJECT(EtherDump) +{ + return new EtherDump(getInstanceName(), file); +} + +REGISTER_SIM_OBJECT("EtherDump", EtherDump) |