| 1 | /* $Id: Pcap.cpp 69500 2017-10-28 15:14:05Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * Helpers for writing libpcap files.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2017 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | /*********************************************************************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *********************************************************************************************************************************/
|
|---|
| 22 | #include "Pcap.h"
|
|---|
| 23 |
|
|---|
| 24 | #include <iprt/file.h>
|
|---|
| 25 | #include <iprt/stream.h>
|
|---|
| 26 | #include <iprt/time.h>
|
|---|
| 27 | #include <iprt/err.h>
|
|---|
| 28 | #include <VBox/vmm/pdmnetinline.h>
|
|---|
| 29 |
|
|---|
| 30 |
|
|---|
| 31 | /*********************************************************************************************************************************
|
|---|
| 32 | * Structures and Typedefs *
|
|---|
| 33 | *********************************************************************************************************************************/
|
|---|
| 34 |
|
|---|
| 35 | /* "libpcap" magic */
|
|---|
| 36 | #define PCAP_MAGIC 0xa1b2c3d4
|
|---|
| 37 |
|
|---|
| 38 | /* "libpcap" file header (minus magic number). */
|
|---|
| 39 | struct pcap_hdr
|
|---|
| 40 | {
|
|---|
| 41 | uint16_t version_major; /* major version number = 2 */
|
|---|
| 42 | uint16_t version_minor; /* minor version number = 4 */
|
|---|
| 43 | int32_t thiszone; /* GMT to local correction = 0 */
|
|---|
| 44 | uint32_t sigfigs; /* accuracy of timestamps = 0 */
|
|---|
| 45 | uint32_t snaplen; /* max length of captured packets, in octets = 0xffff */
|
|---|
| 46 | uint32_t network; /* data link type = 01 */
|
|---|
| 47 | };
|
|---|
| 48 |
|
|---|
| 49 | /* "libpcap" record header. */
|
|---|
| 50 | struct pcaprec_hdr
|
|---|
| 51 | {
|
|---|
| 52 | uint32_t ts_sec; /* timestamp seconds */
|
|---|
| 53 | uint32_t ts_usec; /* timestamp microseconds */
|
|---|
| 54 | uint32_t incl_len; /* number of octets of packet saved in file */
|
|---|
| 55 | uint32_t orig_len; /* actual length of packet */
|
|---|
| 56 | };
|
|---|
| 57 |
|
|---|
| 58 | struct pcaprec_hdr_init
|
|---|
| 59 | {
|
|---|
| 60 | uint32_t u32Magic;
|
|---|
| 61 | struct pcap_hdr pcap;
|
|---|
| 62 | };
|
|---|
| 63 |
|
|---|
| 64 |
|
|---|
| 65 | /*********************************************************************************************************************************
|
|---|
| 66 | * Global Variables *
|
|---|
| 67 | *********************************************************************************************************************************/
|
|---|
| 68 | static pcaprec_hdr_init const s_Hdr =
|
|---|
| 69 | {
|
|---|
| 70 | PCAP_MAGIC,
|
|---|
| 71 | { 2, 4, 0, 0, 0xffff, 1 },
|
|---|
| 72 | };
|
|---|
| 73 |
|
|---|
| 74 | static const char s_szDummyData[] = { 0, 0, 0, 0 };
|
|---|
| 75 |
|
|---|
| 76 | /**
|
|---|
| 77 | * Internal helper.
|
|---|
| 78 | */
|
|---|
| 79 | static void pcapCalcHeader(struct pcaprec_hdr *pHdr, uint64_t StartNanoTS, size_t cbFrame, size_t cbMax)
|
|---|
| 80 | {
|
|---|
| 81 | uint64_t u64TS = RTTimeNanoTS() - StartNanoTS;
|
|---|
| 82 | pHdr->ts_sec = (uint32_t)(u64TS / 1000000000);
|
|---|
| 83 | pHdr->ts_usec = (uint32_t)((u64TS / 1000) % 1000000);
|
|---|
| 84 | pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
|
|---|
| 85 | pHdr->orig_len = (uint32_t)cbFrame;
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 |
|
|---|
| 89 | /**
|
|---|
| 90 | * Internal helper.
|
|---|
| 91 | */
|
|---|
| 92 | static void pcapUpdateHeader(struct pcaprec_hdr *pHdr, size_t cbFrame, size_t cbMax)
|
|---|
| 93 | {
|
|---|
| 94 | pHdr->incl_len = (uint32_t)RT_MIN(cbFrame, cbMax);
|
|---|
| 95 | pHdr->orig_len = (uint32_t)cbFrame;
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 |
|
|---|
| 99 | /**
|
|---|
| 100 | * Writes the stream header.
|
|---|
| 101 | *
|
|---|
| 102 | * @returns IPRT status code, @see RTStrmWrite.
|
|---|
| 103 | *
|
|---|
| 104 | * @param pStream The stream handle.
|
|---|
| 105 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 106 | */
|
|---|
| 107 | int PcapStreamHdr(PRTSTREAM pStream, uint64_t StartNanoTS)
|
|---|
| 108 | {
|
|---|
| 109 | int rc1 = RTStrmWrite(pStream, &s_Hdr, sizeof(s_Hdr));
|
|---|
| 110 | int rc2 = PcapStreamFrame(pStream, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
|
|---|
| 111 | return RT_SUCCESS(rc1) ? rc2 : rc1;
|
|---|
| 112 | }
|
|---|
| 113 |
|
|---|
| 114 |
|
|---|
| 115 | /**
|
|---|
| 116 | * Writes a frame to a stream.
|
|---|
| 117 | *
|
|---|
| 118 | * @returns IPRT status code, @see RTStrmWrite.
|
|---|
| 119 | *
|
|---|
| 120 | * @param pStream The stream handle.
|
|---|
| 121 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 122 | * @param pvFrame The start of the frame.
|
|---|
| 123 | * @param cbFrame The size of the frame.
|
|---|
| 124 | * @param cbMax The max number of bytes to include in the file.
|
|---|
| 125 | */
|
|---|
| 126 | int PcapStreamFrame(PRTSTREAM pStream, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
|
|---|
| 127 | {
|
|---|
| 128 | struct pcaprec_hdr Hdr;
|
|---|
| 129 | pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
|
|---|
| 130 | int rc1 = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
|
|---|
| 131 | int rc2 = RTStrmWrite(pStream, pvFrame, Hdr.incl_len);
|
|---|
| 132 | return RT_SUCCESS(rc1) ? rc2 : rc1;
|
|---|
| 133 | }
|
|---|
| 134 |
|
|---|
| 135 |
|
|---|
| 136 | /**
|
|---|
| 137 | * Writes a GSO frame to a stream.
|
|---|
| 138 | *
|
|---|
| 139 | * @returns IPRT status code, @see RTStrmWrite.
|
|---|
| 140 | *
|
|---|
| 141 | * @param pStream The stream handle.
|
|---|
| 142 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 143 | * @param pGso Pointer to the GSO context.
|
|---|
| 144 | * @param pvFrame The start of the GSO frame.
|
|---|
| 145 | * @param cbFrame The size of the GSO frame.
|
|---|
| 146 | * @param cbSegMax The max number of bytes to include in the file for
|
|---|
| 147 | * each segment.
|
|---|
| 148 | */
|
|---|
| 149 | int PcapStreamGsoFrame(PRTSTREAM pStream, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
|
|---|
| 150 | const void *pvFrame, size_t cbFrame, size_t cbSegMax)
|
|---|
| 151 | {
|
|---|
| 152 | struct pcaprec_hdr Hdr;
|
|---|
| 153 | pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
|
|---|
| 154 |
|
|---|
| 155 | uint8_t const *pbFrame = (uint8_t const *)pvFrame;
|
|---|
| 156 | uint8_t abHdrs[256];
|
|---|
| 157 | uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
|
|---|
| 158 | for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
|
|---|
| 159 | {
|
|---|
| 160 | uint32_t cbSegPayload, cbHdrs;
|
|---|
| 161 | uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
|
|---|
| 162 |
|
|---|
| 163 | pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
|
|---|
| 164 | int rc = RTStrmWrite(pStream, &Hdr, sizeof(Hdr));
|
|---|
| 165 | if (RT_FAILURE(rc))
|
|---|
| 166 | return rc;
|
|---|
| 167 |
|
|---|
| 168 | rc = RTStrmWrite(pStream, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs));
|
|---|
| 169 | if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
|
|---|
| 170 | rc = RTStrmWrite(pStream, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs);
|
|---|
| 171 | if (RT_FAILURE(rc))
|
|---|
| 172 | return rc;
|
|---|
| 173 | }
|
|---|
| 174 |
|
|---|
| 175 | return VINF_SUCCESS;
|
|---|
| 176 | }
|
|---|
| 177 |
|
|---|
| 178 |
|
|---|
| 179 | /**
|
|---|
| 180 | * Writes the file header.
|
|---|
| 181 | *
|
|---|
| 182 | * @returns IPRT status code, @see RTFileWrite.
|
|---|
| 183 | *
|
|---|
| 184 | * @param File The file handle.
|
|---|
| 185 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 186 | */
|
|---|
| 187 | int PcapFileHdr(RTFILE File, uint64_t StartNanoTS)
|
|---|
| 188 | {
|
|---|
| 189 | int rc1 = RTFileWrite(File, &s_Hdr, sizeof(s_Hdr), NULL);
|
|---|
| 190 | int rc2 = PcapFileFrame(File, StartNanoTS, s_szDummyData, 60, sizeof(s_szDummyData));
|
|---|
| 191 | return RT_SUCCESS(rc1) ? rc2 : rc1;
|
|---|
| 192 | }
|
|---|
| 193 |
|
|---|
| 194 |
|
|---|
| 195 | /**
|
|---|
| 196 | * Writes a frame to a file.
|
|---|
| 197 | *
|
|---|
| 198 | * @returns IPRT status code, @see RTFileWrite.
|
|---|
| 199 | *
|
|---|
| 200 | * @param File The file handle.
|
|---|
| 201 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 202 | * @param pvFrame The start of the frame.
|
|---|
| 203 | * @param cbFrame The size of the frame.
|
|---|
| 204 | * @param cbMax The max number of bytes to include in the file.
|
|---|
| 205 | */
|
|---|
| 206 | int PcapFileFrame(RTFILE File, uint64_t StartNanoTS, const void *pvFrame, size_t cbFrame, size_t cbMax)
|
|---|
| 207 | {
|
|---|
| 208 | struct pcaprec_hdr Hdr;
|
|---|
| 209 | pcapCalcHeader(&Hdr, StartNanoTS, cbFrame, cbMax);
|
|---|
| 210 | int rc1 = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
|
|---|
| 211 | int rc2 = RTFileWrite(File, pvFrame, Hdr.incl_len, NULL);
|
|---|
| 212 | return RT_SUCCESS(rc1) ? rc2 : rc1;
|
|---|
| 213 | }
|
|---|
| 214 |
|
|---|
| 215 |
|
|---|
| 216 | /**
|
|---|
| 217 | * Writes a GSO frame to a file.
|
|---|
| 218 | *
|
|---|
| 219 | * @returns IPRT status code, @see RTFileWrite.
|
|---|
| 220 | *
|
|---|
| 221 | * @param File The file handle.
|
|---|
| 222 | * @param StartNanoTS What to subtract from the RTTimeNanoTS output.
|
|---|
| 223 | * @param pGso Pointer to the GSO context.
|
|---|
| 224 | * @param pvFrame The start of the GSO frame.
|
|---|
| 225 | * @param cbFrame The size of the GSO frame.
|
|---|
| 226 | * @param cbSegMax The max number of bytes to include in the file for
|
|---|
| 227 | * each segment.
|
|---|
| 228 | */
|
|---|
| 229 | int PcapFileGsoFrame(RTFILE File, uint64_t StartNanoTS, PCPDMNETWORKGSO pGso,
|
|---|
| 230 | const void *pvFrame, size_t cbFrame, size_t cbSegMax)
|
|---|
| 231 | {
|
|---|
| 232 | struct pcaprec_hdr Hdr;
|
|---|
| 233 | pcapCalcHeader(&Hdr, StartNanoTS, 0, 0);
|
|---|
| 234 |
|
|---|
| 235 | uint8_t const *pbFrame = (uint8_t const *)pvFrame;
|
|---|
| 236 | uint8_t abHdrs[256];
|
|---|
| 237 | uint32_t const cSegs = PDMNetGsoCalcSegmentCount(pGso, cbFrame);
|
|---|
| 238 | for (uint32_t iSeg = 0; iSeg < cSegs; iSeg++)
|
|---|
| 239 | {
|
|---|
| 240 | uint32_t cbSegPayload, cbHdrs;
|
|---|
| 241 | uint32_t offSegPayload = PDMNetGsoCarveSegment(pGso, pbFrame, cbFrame, iSeg, cSegs, abHdrs, &cbHdrs, &cbSegPayload);
|
|---|
| 242 |
|
|---|
| 243 | pcapUpdateHeader(&Hdr, cbHdrs + cbSegPayload, cbSegMax);
|
|---|
| 244 | int rc = RTFileWrite(File, &Hdr, sizeof(Hdr), NULL);
|
|---|
| 245 | if (RT_FAILURE(rc))
|
|---|
| 246 | return rc;
|
|---|
| 247 |
|
|---|
| 248 | rc = RTFileWrite(File, abHdrs, RT_MIN(Hdr.incl_len, cbHdrs), NULL);
|
|---|
| 249 | if (RT_SUCCESS(rc) && Hdr.incl_len > cbHdrs)
|
|---|
| 250 | rc = RTFileWrite(File, pbFrame + offSegPayload, Hdr.incl_len - cbHdrs, NULL);
|
|---|
| 251 | if (RT_FAILURE(rc))
|
|---|
| 252 | return rc;
|
|---|
| 253 | }
|
|---|
| 254 |
|
|---|
| 255 | return VINF_SUCCESS;
|
|---|
| 256 | }
|
|---|
| 257 |
|
|---|
