2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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30 * Simple object for creating a simple pcap style packet trace
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"
46 EtherDump::EtherDump(const string
&name
, const string
&file
, int max
)
47 : SimObject(name
), stream(file
.c_str()), maxlen(max
)
51 #define DLT_EN10MB 1 // Ethernet (10Mb)
52 #define TCPDUMP_MAGIC 0xa1b2c3d4
53 #define PCAP_VERSION_MAJOR 2
54 #define PCAP_VERSION_MINOR 4
56 struct pcap_file_header
{
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_*)
68 uint32_t microseconds
;
69 uint32_t caplen
; // length of portion present
70 uint32_t len
; // length this packet (off wire)
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
;
82 hdr
.thiszone
= -5 * 3600;
85 hdr
.linktype
= DLT_EN10MB
;
87 stream
.write(reinterpret_cast<char *>(&hdr
), sizeof(hdr
));
90 * output an empty packet with the current time so that we know
91 * when the simulation began. This allows us to correlate packets
95 pkthdr
.seconds
= curtime
;
96 pkthdr
.microseconds
= 0;
99 stream
.write(reinterpret_cast<char *>(&pkthdr
), sizeof(pkthdr
));
105 EtherDump::dumpPacket(EthPacketPtr
&packet
)
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
);
117 BEGIN_DECLARE_SIM_OBJECT_PARAMS(EtherDump
)
122 END_DECLARE_SIM_OBJECT_PARAMS(EtherDump
)
124 BEGIN_INIT_SIM_OBJECT_PARAMS(EtherDump
)
126 INIT_PARAM(file
, "file to dump packets to"),
127 INIT_PARAM(maxlen
, "max portion of packet data to dump")
129 END_INIT_SIM_OBJECT_PARAMS(EtherDump
)
131 CREATE_SIM_OBJECT(EtherDump
)
133 return new EtherDump(getInstanceName(), simout
.resolve(file
), maxlen
);
136 REGISTER_SIM_OBJECT("EtherDump", EtherDump
)