| 1 | /* $Id: Pcap.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Helpers for writing libpcap files.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #include "Pcap.h"
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| 23 |
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| 24 | #include <iprt/file.h>
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| 25 | #include <iprt/stream.h>
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| 26 | #include <iprt/time.h>
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| 27 | #include <iprt/errcore.h>
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| 28 | #include <VBox/vmm/pdmnetinline.h>
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| 29 |
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| 30 |
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| 31 | /*********************************************************************************************************************************
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| 32 | * Structures and Typedefs *
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| 33 | *********************************************************************************************************************************/
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| 34 |
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| 35 | /* "libpcap" magic */
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| 36 | #define PCAP_MAGIC 0xa1b2c3d4
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| 37 |
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| 38 | /* "libpcap" file header (minus magic number). */
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| 39 | struct pcap_hdr
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| 40 | {
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| 41 | uint16_t version_major; /* major version number = 2 */
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| 42 | uint16_t version_minor; /* minor version number = 4 */
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| 43 | int32_t thiszone; /* GMT to local correction = 0 */
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| 44 | uint32_t sigfigs; /* accuracy of timestamps = 0 */
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| 45 | uint32_t snaplen; /* max length of captured packets, in octets = 0xffff */
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| 46 | uint32_t network; /* data link type = 01 */
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| 47 | };
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| 48 |
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| 49 | /* "libpcap" record header. */
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| 50 | struct pcaprec_hdr
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| 51 | {
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| 52 | uint32_t ts_sec; /* timestamp seconds */
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| 53 | uint32_t ts_usec; /* timestamp microseconds */
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| 54 | uint32_t incl_len; /* number of octets of packet saved in file */
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| 55 | uint32_t orig_len; /* actual length of packet */
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| 56 | };
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| 57 |
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| 58 | struct pcaprec_hdr_init
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| 59 | {
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| 60 | uint32_t u32Magic;
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| 61 | struct pcap_hdr pcap;
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| 62 | };
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| 63 |
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| 64 |
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| 65 | /*********************************************************************************************************************************
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| 66 | * Global Variables *
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| 67 | *********************************************************************************************************************************/
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| 68 | static pcaprec_hdr_init const s_Hdr =
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| 69 | {
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| 70 | PCAP_MAGIC,
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| 71 | { 2, 4, 0, 0, 0xffff, 1 },
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| 72 | };
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| 73 |
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| 74 | static const char s_szDummyData[] = { 0, 0, 0, 0 };
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| 75 |
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| 76 | /**
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| 77 | * Internal helper.
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| 78 | */
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| 79 | static void pcapCalcHeader(struct pcaprec_hdr *pHdr, uint64_t StartNanoTS, size_t cbFrame, size_t cbMax)
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| 80 | {
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| 81 | uint64_t u64TS = RTTimeNanoTS() - StartNanoTS;
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| 82 | pHdr->ts_sec = (uint32_t)(u64TS / 1000000000);
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| 83 | pHdr->ts_usec = (uint32_t)((u64TS / 1000) % 1000000);
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| 84 | pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
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| 85 | pHdr->orig_len = (uint32_t)cbFrame;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | /**
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| 90 | * Internal helper.
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| 91 | */
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| 92 | static void pcapUpdateHeader(struct pcaprec_hdr *pHdr, size_t cbFrame, size_t cbMax)
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| 93 | {
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| 94 | pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
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| 95 | pHdr->orig_len = (uint32_t)cbFrame;
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| 96 | }
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| 97 |
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| 98 |
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| 99 | /**
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| 100 | * Writes the stream header.
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| 101 | *
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| 102 | * @returns IPRT status code, @see RTStrmWrite.
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| 103 | *
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| 104 | * @param pStream The stream handle.
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| 105 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 106 | */
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| 107 | int PcapStreamHdr(PRTSTREAM pStream, uint64_t StartNanoTS)
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| 108 | {
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| 109 | int rc1 = RTStrmWrite(pStream, &s_Hdr, sizeof(s_Hdr));
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| 110 | int rc2 = PcapStreamFrame(pStream, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
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| 111 | return RT_SUCCESS(rc1) ? rc2 : rc1;
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| 112 | }
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| 113 |
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| 114 |
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| 115 | /**
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| 116 | * Writes a frame to a stream.
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| 117 | *
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| 118 | * @returns IPRT status code, @see RTStrmWrite.
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| 119 | *
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| 120 | * @param pStream The stream handle.
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| 121 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 122 | * @param pvFrame The start of the frame.
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| 123 | * @param cbFrame The size of the frame.
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| 124 | * @param cbMax The max number of bytes to include in the file.
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| 125 | */
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| 126 | int PcapStreamFrame(PRTSTREAM pStream, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
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| 127 | {
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| 128 | struct pcaprec_hdr Hdr;
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| 129 | pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
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| 130 | int rc1 = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
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| 131 | int rc2 = RTStrmWrite(pStream, pvFrame, Hdr.incl_len);
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| 132 | return RT_SUCCESS(rc1) ? rc2 : rc1;
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| 133 | }
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| 134 |
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| 135 |
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| 136 | /**
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| 137 | * Writes a GSO frame to a stream.
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| 138 | *
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| 139 | * @returns IPRT status code, @see RTStrmWrite.
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| 140 | *
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| 141 | * @param pStream The stream handle.
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| 142 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 143 | * @param pGso Pointer to the GSO context.
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| 144 | * @param pvFrame The start of the GSO frame.
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| 145 | * @param cbFrame The size of the GSO frame.
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| 146 | * @param cbSegMax The max number of bytes to include in the file for
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| 147 | * each segment.
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| 148 | */
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| 149 | int PcapStreamGsoFrame(PRTSTREAM pStream, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
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| 150 | const void *pvFrame, size_t cbFrame, size_t cbSegMax)
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| 151 | {
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| 152 | struct pcaprec_hdr Hdr;
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| 153 | pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
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| 154 |
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| 155 | uint8_t const *pbFrame = (uint8_t const *)pvFrame;
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| 156 | uint8_t abHdrs[256];
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| 157 | uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
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| 158 | for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
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| 159 | {
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| 160 | uint32_t cbSegPayload, cbHdrs;
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| 161 | uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
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| 162 |
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| 163 | pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
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| 164 | int rc = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
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| 165 | if (RT_FAILURE(rc))
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| 166 | return rc;
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| 167 |
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| 168 | rc = RTStrmWrite(pStream, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs));
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| 169 | if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
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| 170 | rc = RTStrmWrite(pStream, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs);
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| 171 | if (RT_FAILURE(rc))
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| 172 | return rc;
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| 173 | }
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| 174 |
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| 175 | return VINF_SUCCESS;
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| 176 | }
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| 177 |
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| 178 |
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| 179 | /**
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| 180 | * Writes the file header.
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| 181 | *
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| 182 | * @returns IPRT status code, @see RTFileWrite.
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| 183 | *
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| 184 | * @param File The file handle.
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| 185 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 186 | */
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| 187 | int PcapFileHdr(RTFILE File, uint64_t StartNanoTS)
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| 188 | {
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| 189 | int rc1 = RTFileWrite(File, &s_Hdr, sizeof(s_Hdr), NULL);
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| 190 | int rc2 = PcapFileFrame(File, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
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| 191 | return RT_SUCCESS(rc1) ? rc2 : rc1;
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| 192 | }
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| 193 |
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| 194 |
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| 195 | /**
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| 196 | * Writes a frame to a file.
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| 197 | *
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| 198 | * @returns IPRT status code, @see RTFileWrite.
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| 199 | *
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| 200 | * @param File The file handle.
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| 201 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 202 | * @param pvFrame The start of the frame.
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| 203 | * @param cbFrame The size of the frame.
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| 204 | * @param cbMax The max number of bytes to include in the file.
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| 205 | */
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| 206 | int PcapFileFrame(RTFILE File, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
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| 207 | {
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| 208 | struct pcaprec_hdr Hdr;
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| 209 | pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
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| 210 | int rc1 = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
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| 211 | int rc2 = RTFileWrite(File, pvFrame, Hdr.incl_len, NULL);
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| 212 | return RT_SUCCESS(rc1) ? rc2 : rc1;
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| 213 | }
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| 214 |
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| 215 |
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| 216 | /**
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| 217 | * Writes a GSO frame to a file.
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| 218 | *
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| 219 | * @returns IPRT status code, @see RTFileWrite.
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| 220 | *
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| 221 | * @param File The file handle.
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| 222 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
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| 223 | * @param pGso Pointer to the GSO context.
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| 224 | * @param pvFrame The start of the GSO frame.
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| 225 | * @param cbFrame The size of the GSO frame.
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| 226 | * @param cbSegMax The max number of bytes to include in the file for
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| 227 | * each segment.
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| 228 | */
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| 229 | int PcapFileGsoFrame(RTFILE File, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
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| 230 | const void *pvFrame, size_t cbFrame, size_t cbSegMax)
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| 231 | {
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| 232 | struct pcaprec_hdr Hdr;
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| 233 | pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
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| 234 |
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| 235 | uint8_t const *pbFrame = (uint8_t const *)pvFrame;
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| 236 | uint8_t abHdrs[256];
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| 237 | uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
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| 238 | for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
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| 239 | {
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| 240 | uint32_t cbSegPayload, cbHdrs;
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| 241 | uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
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| 242 |
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| 243 | pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
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| 244 | int rc = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
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| 245 | if (RT_FAILURE(rc))
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| 246 | return rc;
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| 247 |
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| 248 | rc = RTFileWrite(File, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs), NULL);
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| 249 | if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
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| 250 | rc = RTFileWrite(File, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs, NULL);
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| 251 | if (RT_FAILURE(rc))
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| 252 | return rc;
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| 253 | }
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| 254 |
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| 255 | return VINF_SUCCESS;
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| 256 | }
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| 257 |
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