1 | /* |
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2 | * |
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3 | * Copyright (c) 2007-2016 The University of Waikato, Hamilton, New Zealand. |
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4 | * All rights reserved. |
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5 | * |
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6 | * This file is part of libtrace. |
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7 | * |
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8 | * This code has been developed by the University of Waikato WAND |
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9 | * research group. For further information please see http://www.wand.net.nz/ |
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10 | * |
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11 | * libtrace is free software; you can redistribute it and/or modify |
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12 | * it under the terms of the GNU Lesser General Public License as published by |
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13 | * the Free Software Foundation; either version 3 of the License, or |
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14 | * (at your option) any later version. |
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15 | * |
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16 | * libtrace is distributed in the hope that it will be useful, |
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17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 | * GNU Lesser General Public License for more details. |
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20 | * |
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21 | * You should have received a copy of the GNU Lesser General Public License |
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22 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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23 | * |
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24 | * |
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25 | */ |
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26 | /** @file |
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27 | * |
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28 | * @brief Header file containing definitions for structures and functions that |
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29 | * are internal |
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30 | * |
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31 | * @author Daniel Lawson |
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32 | * @author Perry Lorier |
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33 | * @author Shane Alcock |
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34 | * |
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35 | * @version $Id$ |
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36 | * |
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37 | * All of the structures and functions defined in this header file are intended |
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38 | * for internal use within Libtrace only. They should not be exported as part |
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39 | * of the library API as we don't want users accessing things like the |
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40 | * contents of the libtrace packet structure directly! |
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41 | */ |
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42 | #ifndef LIBTRACE_INT_H |
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43 | #define LIBTRACE_INT_H |
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44 | |
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45 | #ifdef __cplusplus |
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46 | extern "C" { |
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47 | #endif |
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48 | |
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49 | #include "config.h" |
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50 | #include "common.h" |
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51 | #include "libtrace_parallel.h" |
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52 | #include "wandio.h" |
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53 | #include "lt_bswap.h" |
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54 | |
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55 | #ifdef _MSC_VER |
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56 | // warning: deprecated function |
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57 | #pragma warning(disable:4996) |
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58 | // warning: benign redefinitions of types |
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59 | #pragma warning(disable:4142) |
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60 | #endif |
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61 | |
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62 | #ifdef HAVE_INTTYPES_H |
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63 | # include <inttypes.h> |
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64 | #else |
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65 | # include "lt_inttypes.h" |
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66 | #endif |
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67 | |
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68 | #ifdef HAVE_STDDEF_H |
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69 | # include <stddef.h> |
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70 | #else |
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71 | #ifndef WIN32 |
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72 | # error "Can't find stddev.h -- do you define ptrdiff_t elsewhere?" |
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73 | #endif |
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74 | #endif |
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75 | |
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76 | |
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77 | #include "rt_protocol.h" |
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78 | |
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79 | /* Prefer net/bpf.h over pcap-bpf.h for format_bpf.c on MacOS */ |
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80 | #ifdef HAVE_NET_BPF_H |
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81 | # include <net/bpf.h> |
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82 | # define HAVE_BPF 1 |
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83 | #else |
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84 | #ifdef HAVE_PCAP_BPF_H |
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85 | # include <pcap-bpf.h> |
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86 | # define HAVE_BPF 1 |
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87 | #endif |
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88 | #endif |
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89 | |
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90 | #ifdef HAVE_PCAP_H |
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91 | # include <pcap.h> |
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92 | # ifdef HAVE_PCAP_INT_H |
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93 | # include <pcap-int.h> |
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94 | # endif |
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95 | #endif |
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96 | |
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97 | #ifdef HAVE_ZLIB_H |
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98 | # include <zlib.h> |
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99 | #endif |
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100 | |
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101 | #ifndef HAVE_STRNDUP |
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102 | char *strndup(const char *s, size_t size); |
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103 | #endif |
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104 | |
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105 | #ifndef HAVE_STRNCASECMP |
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106 | # ifndef HAVE__STRNICMP |
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107 | /** A local implementation of strncasecmp (as some systems do not have it) */ |
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108 | int strncasecmp(const char *str1, const char *str2, size_t n); |
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109 | # else |
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110 | # define strncasecmp _strnicmp |
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111 | # endif |
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112 | #endif |
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113 | |
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114 | #ifndef HAVE_SNPRINTF |
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115 | # ifndef HAVE_SPRINTF_S |
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116 | /** A local implementation of snprintf (as some systems do not have it) */ |
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117 | int snprintf(char *str, size_t size, const char *format, ...); |
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118 | # else |
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119 | # define snprintf sprintf_s |
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120 | # endif |
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121 | #endif |
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122 | |
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123 | #include "daglegacy.h" |
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124 | |
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125 | #ifdef HAVE_DAG_API |
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126 | # include "dagnew.h" |
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127 | # include "dagapi.h" |
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128 | # if DAG_VERSION == 24 |
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129 | # include <erftypes.h> |
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130 | # else |
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131 | # include <daginf.h> |
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132 | # endif |
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133 | # include "erftypes.h" |
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134 | #else |
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135 | # include "dagformat.h" |
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136 | #endif |
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137 | |
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138 | #ifdef HAVE_LLVM |
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139 | #include "bpf-jit/bpf-jit.h" |
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140 | #endif |
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141 | |
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142 | #include "data-struct/ring_buffer.h" |
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143 | #include "data-struct/object_cache.h" |
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144 | #include "data-struct/vector.h" |
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145 | #include "data-struct/message_queue.h" |
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146 | #include "data-struct/deque.h" |
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147 | #include "data-struct/linked_list.h" |
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148 | #include "data-struct/sliding_window.h" |
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149 | #include "data-struct/buckets.h" |
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150 | #include "pthread_spinlock.h" |
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151 | |
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152 | //#define RP_BUFSIZE 65536U |
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153 | |
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154 | /** Data about the most recent event from a trace file */ |
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155 | struct libtrace_event_status_t { |
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156 | /** A libtrace packet to store the packet when a PACKET event occurs */ |
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157 | libtrace_packet_t *packet; |
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158 | /** Time between the timestamp for the current packet and the current |
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159 | * walltime */ |
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160 | double tdelta; |
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161 | /** The timestamp of the previous PACKET event */ |
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162 | double trace_last_ts; |
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163 | /** The size of the current PACKET event */ |
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164 | int psize; |
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165 | /** Whether there is a packet stored in *packet above waiting for an |
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166 | * event to occur */ |
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167 | bool waiting; |
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168 | }; |
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169 | |
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170 | enum thread_types { |
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171 | THREAD_EMPTY, |
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172 | THREAD_HASHER, |
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173 | THREAD_PERPKT, |
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174 | THREAD_REPORTER, |
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175 | THREAD_KEEPALIVE |
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176 | }; |
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177 | |
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178 | enum thread_states { |
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179 | THREAD_RUNNING, |
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180 | THREAD_FINISHING, |
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181 | THREAD_FINISHED, |
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182 | THREAD_PAUSED, |
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183 | THREAD_STATE_MAX |
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184 | }; |
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185 | |
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186 | enum hash_owner { |
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187 | HASH_OWNED_LIBTRACE, |
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188 | HASH_OWNED_EXTERNAL, |
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189 | }; |
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190 | |
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191 | /** |
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192 | * Information of this thread |
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193 | */ |
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194 | struct libtrace_thread_t { |
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195 | uint64_t accepted_packets; // The number of packets accepted only used if pread |
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196 | uint64_t filtered_packets; |
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197 | // is retreving packets |
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198 | // Set to true once the first packet has been stored |
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199 | bool recorded_first; |
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200 | // For thread safety reason we actually must store this here |
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201 | int64_t tracetime_offset_usec; |
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202 | void* user_data; // TLS for the user to use |
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203 | void* format_data; // TLS for the format to use |
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204 | libtrace_message_queue_t messages; // Message handling |
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205 | libtrace_ringbuffer_t rbuffer; // Input |
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206 | libtrace_t * trace; |
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207 | void* ret; |
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208 | enum thread_types type; |
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209 | enum thread_states state; |
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210 | pthread_t tid; |
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211 | int perpkt_num; // A number from 0-X that represents this perpkt threads number |
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212 | // in the table, intended to quickly identify this thread |
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213 | // -1 represents NA (such as the case this is not a perpkt thread) |
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214 | } ALIGN_STRUCT(CACHE_LINE_SIZE); |
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215 | |
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216 | /** |
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217 | * Storage to note time value against each. |
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218 | * Used both internally to do trace time playback |
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219 | * and can be used externally to assist applications which need |
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220 | * a trace starting time such as tracertstats. |
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221 | */ |
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222 | struct first_packets { |
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223 | pthread_spinlock_t lock; |
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224 | size_t count; // If == perpkt_thread_count threads we have all |
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225 | size_t first; // Valid if count != 0 |
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226 | struct { |
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227 | libtrace_packet_t * packet; |
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228 | struct timeval tv; |
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229 | } * packets; |
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230 | }; |
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231 | |
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232 | #define TRACE_STATES \ |
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233 | X(STATE_NEW) \ |
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234 | X(STATE_RUNNING) \ |
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235 | X(STATE_PAUSING) \ |
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236 | X(STATE_PAUSED) \ |
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237 | X(STATE_FINISHED) \ |
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238 | X(STATE_FINISHING) \ |
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239 | X(STATE_DESTROYED) \ |
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240 | X(STATE_JOINED) \ |
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241 | X(STATE_ERROR) |
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242 | |
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243 | #define X(a) a, |
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244 | enum trace_state { |
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245 | TRACE_STATES |
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246 | }; |
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247 | #undef X |
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248 | |
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249 | #define X(a) case a: return #a; |
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250 | static inline char *get_trace_state_name(enum trace_state ts){ |
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251 | switch(ts) { |
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252 | TRACE_STATES |
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253 | default: |
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254 | return "UNKNOWN"; |
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255 | } |
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256 | } |
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257 | #undef X |
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258 | |
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259 | #define READ_EOF 0 |
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260 | #define READ_ERROR -1 |
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261 | #define READ_MESSAGE -2 |
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262 | // Used for inband tick message |
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263 | #define READ_TICK -3 |
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264 | |
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265 | /** |
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266 | * Tuning the parallel sizes |
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267 | * See the user documentation trace_set_x |
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268 | */ |
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269 | struct user_configuration { |
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270 | size_t cache_size; |
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271 | size_t thread_cache_size; |
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272 | bool fixed_count; |
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273 | size_t burst_size; |
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274 | size_t tick_interval; |
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275 | size_t tick_count; |
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276 | size_t perpkt_threads; |
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277 | size_t hasher_queue_size; |
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278 | bool hasher_polling; |
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279 | bool reporter_polling; |
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280 | size_t reporter_thold; |
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281 | bool debug_state; |
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282 | }; |
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283 | #define ZERO_USER_CONFIG(config) memset(&config, 0, sizeof(struct user_configuration)); |
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284 | |
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285 | struct callback_set { |
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286 | |
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287 | fn_cb_starting message_starting; |
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288 | fn_cb_dataless message_stopping; |
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289 | fn_cb_dataless message_resuming; |
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290 | fn_cb_dataless message_pausing; |
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291 | fn_cb_packet message_packet; |
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292 | fn_cb_result message_result; |
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293 | fn_cb_first_packet message_first_packet; |
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294 | fn_cb_tick message_tick_count; |
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295 | fn_cb_tick message_tick_interval; |
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296 | fn_cb_usermessage message_user; |
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297 | }; |
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298 | |
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299 | /** A libtrace input trace |
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300 | * @internal |
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301 | */ |
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302 | struct libtrace_t { |
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303 | /** The capture format for the input trace */ |
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304 | struct libtrace_format_t *format; |
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305 | /** Details of the most recent PACKET event reported by the trace */ |
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306 | struct libtrace_event_status_t event; |
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307 | /** Pointer to the "global" data for the capture format module */ |
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308 | void *format_data; |
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309 | /** A BPF filter to be applied to all packets read by the trace - |
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310 | * used only if the capture format does not support filters natively */ |
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311 | struct libtrace_filter_t *filter; |
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312 | /** The snap length to be applied to all packets read by the trace - |
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313 | * used only if the capture format does not support snapping natively */ |
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314 | size_t snaplen; |
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315 | /** Count of the number of packets returned to the libtrace user */ |
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316 | uint64_t accepted_packets; |
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317 | /** Count of the number of packets filtered by libtrace */ |
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318 | uint64_t filtered_packets; |
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319 | /** The sequence is like accepted_packets but we don't reset this after a pause. */ |
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320 | uint64_t sequence_number; |
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321 | /** The packet read out by the trace, backwards compatibility to allow us to finalise |
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322 | * a packet when the trace is destroyed */ |
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323 | libtrace_packet_t *last_packet; |
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324 | /** The filename from the uri for the trace */ |
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325 | char *uridata; |
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326 | /** The libtrace IO reader for this trace (if applicable) */ |
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327 | io_t *io; |
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328 | /** Error information for the trace */ |
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329 | libtrace_err_t err; |
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330 | /** Boolean flag indicating whether the trace has been started */ |
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331 | bool started; |
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332 | /** Synchronise writes/reads across this format object and attached threads etc */ |
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333 | pthread_mutex_t libtrace_lock; |
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334 | /** Packet read lock, seperate from libtrace_lock as to not block while reading a burst */ |
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335 | pthread_mutex_t read_packet_lock; |
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336 | /** State */ |
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337 | enum trace_state state; |
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338 | /** Use to control pausing threads and finishing threads etc always used with libtrace_lock */ |
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339 | pthread_cond_t perpkt_cond; |
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340 | /** Keeps track of counts of threads in any given state */ |
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341 | int perpkt_thread_states[THREAD_STATE_MAX]; |
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342 | |
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343 | /** Set to indicate a perpkt's queue is full as such the writing perpkt cannot proceed */ |
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344 | bool perpkt_queue_full; |
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345 | /** Global storage for this trace, shared among all the threads */ |
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346 | void* global_blob; |
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347 | /** The actual freelist */ |
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348 | libtrace_ocache_t packet_freelist; |
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349 | /** The hasher function */ |
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350 | enum hasher_types hasher_type; |
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351 | /** The hasher function - NULL implies they don't care or balance */ |
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352 | fn_hasher hasher; |
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353 | void *hasher_data; |
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354 | enum hash_owner hasher_owner; |
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355 | /** The pread_packet choosen path for the configuration */ |
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356 | int (*pread)(libtrace_t *, libtrace_thread_t *, libtrace_packet_t **, size_t); |
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357 | |
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358 | libtrace_thread_t hasher_thread; |
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359 | libtrace_thread_t reporter_thread; |
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360 | libtrace_thread_t keepalive_thread; |
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361 | int perpkt_thread_count; |
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362 | libtrace_thread_t * perpkt_threads; // All our perpkt threads |
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363 | // Used to keep track of the first packet seen on each thread |
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364 | struct first_packets first_packets; |
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365 | int tracetime; |
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366 | |
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367 | /* |
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368 | * Caches statistic counters in the case that our trace is |
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369 | * paused or stopped before this counter is taken |
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370 | */ |
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371 | libtrace_stat_t *stats; |
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372 | struct user_configuration config; |
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373 | libtrace_combine_t combiner; |
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374 | |
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375 | /* Set of callbacks to be executed by per packet threads in response |
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376 | * to various messages. */ |
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377 | struct callback_set *perpkt_cbs; |
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378 | /* Set of callbacks to be executed by the reporter thread in response |
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379 | * to various messages. */ |
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380 | struct callback_set *reporter_cbs; |
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381 | }; |
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382 | |
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383 | #define LIBTRACE_STAT_MAGIC 0x41 |
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384 | |
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385 | void trace_fin_packet(libtrace_packet_t *packet); |
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386 | void libtrace_zero_thread(libtrace_thread_t * t); |
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387 | void store_first_packet(libtrace_t *libtrace, libtrace_packet_t *packet, libtrace_thread_t *t); |
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388 | libtrace_thread_t * get_thread_table(libtrace_t *libtrace); |
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389 | |
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390 | |
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391 | void send_message(libtrace_t *trace, libtrace_thread_t *target, |
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392 | const enum libtrace_messages type, |
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393 | libtrace_generic_t data, libtrace_thread_t *sender); |
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394 | |
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395 | /** A libtrace output trace |
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396 | * @internal |
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397 | */ |
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398 | struct libtrace_out_t { |
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399 | /** The capture format for the output trace */ |
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400 | struct libtrace_format_t *format; |
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401 | /** Pointer to the "global" data for the capture format module */ |
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402 | void *format_data; |
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403 | /** The filename for the uri for the output trace */ |
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404 | char *uridata; |
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405 | /** Error information for the output trace */ |
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406 | libtrace_err_t err; |
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407 | /** Boolean flag indicating whether the trace has been started */ |
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408 | bool started; |
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409 | }; |
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410 | |
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411 | /** Sets the error status on an input trace |
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412 | * |
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413 | * @param trace The input trace to set the error status for |
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414 | * @param errcode The code for the error - can be a libtrace error code or a regular errno value |
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415 | * @param msg A message to print when reporting the error |
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416 | */ |
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417 | void trace_set_err(libtrace_t *trace, int errcode,const char *msg,...) |
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418 | |
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419 | PRINTF(3,4); |
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420 | /** Sets the error status on an output trace |
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421 | * |
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422 | * @param trace The output trace to set the error status for |
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423 | * @param errcode The code for the error - can be a libtrace error code or a regular errno value |
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424 | * @param msg A message to print when reporting the error |
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425 | */ |
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426 | void trace_set_err_out(libtrace_out_t *trace, int errcode, const char *msg,...) |
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427 | PRINTF(3,4); |
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428 | |
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429 | /** Clears the cached values for a libtrace packet |
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430 | * |
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431 | * @param packet The libtrace packet that requires a cache reset |
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432 | */ |
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433 | void trace_clear_cache(libtrace_packet_t *packet); |
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434 | |
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435 | |
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436 | #ifndef PF_RULESET_NAME_SIZE |
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437 | #define PF_RULESET_NAME_SIZE 16 |
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438 | #endif |
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439 | |
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440 | #ifndef IFNAMSIZ |
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441 | #define IFNAMSIZ 16 |
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442 | #endif |
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443 | |
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444 | |
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445 | /** A local definition of a PFLOG header */ |
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446 | typedef struct libtrace_pflog_header_t { |
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447 | uint8_t length; |
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448 | sa_family_t af; |
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449 | uint8_t action; |
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450 | uint8_t reason; |
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451 | char ifname[IFNAMSIZ]; |
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452 | char ruleset[PF_RULESET_NAME_SIZE]; |
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453 | uint32_t rulenr; |
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454 | uint32_t subrulenr; |
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455 | uint8_t dir; |
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456 | uint8_t pad[3]; |
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457 | } PACKED libtrace_pflog_header_t; |
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458 | |
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459 | /** A libtrace capture format module */ |
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460 | /* All functions should return -1, or NULL on failure */ |
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461 | struct libtrace_format_t { |
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462 | /** The name of this module, used in the libtrace URI to identify the |
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463 | * capture format */ |
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464 | const char *name; |
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465 | /** The version of this module */ |
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466 | const char *version; |
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467 | /** The RT protocol type of this module */ |
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468 | enum base_format_t type; |
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469 | |
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470 | |
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471 | /** Given a filename, return if this is the most likely capture format |
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472 | * (used for devices). Used to "guess" the capture format when the |
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473 | * URI is not fully specified. |
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474 | * |
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475 | * @param fname The name of the device or file to examine |
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476 | * @return 1 if the name matches the capture format, 0 otherwise |
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477 | */ |
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478 | int (*probe_filename)(const char *fname); |
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479 | |
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480 | /** Given a file, looks at the start of the file to determine if this |
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481 | * is the capture format. Used to "guess" the capture format when the |
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482 | * URI is not fully specified. |
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483 | * |
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484 | * @param io An open libtrace IO reader for the file to check |
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485 | * @return 1 if the file matches the capture format, 0 otherwise |
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486 | */ |
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487 | int (*probe_magic)(io_t *io); |
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488 | |
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489 | /** Initialises an input trace using the capture format. |
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490 | * |
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491 | * @param libtrace The input trace to be initialised |
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492 | * @return 0 if successful, -1 in the event of error |
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493 | */ |
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494 | int (*init_input)(libtrace_t *libtrace); |
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495 | |
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496 | /** Applies a configuration option to an input trace. |
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497 | * |
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498 | * @param libtrace The input trace to apply the option to |
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499 | * @param option The option that is being configured |
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500 | * @param value A pointer to the value that the option is to be |
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501 | * set to |
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502 | * @return 0 if successful, -1 if the option is unsupported or an error |
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503 | * occurs |
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504 | */ |
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505 | int (*config_input)(libtrace_t *libtrace,trace_option_t option,void *value); |
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506 | /** Starts or unpauses an input trace - note that this function is |
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507 | * often the one that opens the file or device for reading. |
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508 | * |
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509 | * @param libtrace The input trace to be started or unpaused |
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510 | * @return 0 if successful, -1 in the event of error */ |
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511 | int (*start_input)(libtrace_t *libtrace); |
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512 | |
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513 | /** Pauses an input trace - this function should close or detach the |
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514 | * file or device that is being read from. |
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515 | * |
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516 | * @param libtrace The input trace to be paused |
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517 | * @return 0 if successful, -1 in the event of error |
---|
518 | */ |
---|
519 | int (*pause_input)(libtrace_t *libtrace); |
---|
520 | |
---|
521 | /** Initialises an output trace using the capture format. |
---|
522 | * |
---|
523 | * @param libtrace The output trace to be initialised |
---|
524 | * @return 0 if successful, -1 in the event of error |
---|
525 | */ |
---|
526 | int (*init_output)(libtrace_out_t *libtrace); |
---|
527 | |
---|
528 | /** Applies a configuration option to an output trace. |
---|
529 | * |
---|
530 | * @param libtrace The output trace to apply the option to |
---|
531 | * @param option The option that is being configured |
---|
532 | * @param value A pointer to the value that the option is to be |
---|
533 | * set to |
---|
534 | * @return 0 if successful, -1 if the option is unsupported or an error |
---|
535 | * occurs |
---|
536 | * */ |
---|
537 | int (*config_output)(libtrace_out_t *libtrace, trace_option_output_t option, void *value); |
---|
538 | |
---|
539 | /** Starts an output trace - note that this function is often the one |
---|
540 | * that opens the file or device for writing. |
---|
541 | * |
---|
542 | * @param libtrace The output trace to be started |
---|
543 | * @return 0 if successful, -1 if an error occurs |
---|
544 | * |
---|
545 | * There is no pause for output traces, as writing is not performed |
---|
546 | * asynchronously. |
---|
547 | */ |
---|
548 | int (*start_output)(libtrace_out_t *libtrace); |
---|
549 | |
---|
550 | /** Concludes an input trace and cleans up the capture format data. |
---|
551 | * |
---|
552 | * @param libtrace The input trace to be concluded |
---|
553 | * @return 0 if successful, -1 if an error occurs |
---|
554 | * |
---|
555 | * Libtrace will call the pause_input function if the input trace is |
---|
556 | * currently active prior to calling this function. |
---|
557 | */ |
---|
558 | int (*fin_input)(libtrace_t *libtrace); |
---|
559 | |
---|
560 | /** Concludes an output trace and cleans up the capture format data. |
---|
561 | * |
---|
562 | * @param libtrace The output trace to be concluded |
---|
563 | * @return 0 if successful, -1 if an error occurs |
---|
564 | */ |
---|
565 | int (*fin_output)(libtrace_out_t *libtrace); |
---|
566 | |
---|
567 | /** Reads the next packet from an input trace into the provided packet |
---|
568 | * structure. |
---|
569 | * |
---|
570 | * @param libtrace The input trace to read from |
---|
571 | * @param packet The libtrace packet to read into |
---|
572 | * @return The size of the packet read (in bytes) including the capture |
---|
573 | * framing header, or -1 if an error occurs. 0 is returned in the |
---|
574 | * event of an EOF or -2 in the case of interrupting the parallel API. |
---|
575 | * |
---|
576 | * If no packets are available for reading, this function should block |
---|
577 | * until one appears or return 0 if the end of a trace file has been |
---|
578 | * reached. |
---|
579 | */ |
---|
580 | int (*read_packet)(libtrace_t *libtrace, libtrace_packet_t *packet); |
---|
581 | |
---|
582 | /** Converts a buffer containing a packet record into a libtrace packet |
---|
583 | * |
---|
584 | * @param libtrace An input trace in the capture format for the |
---|
585 | * packet |
---|
586 | * @param packet A libtrace packet to put the prepared packet |
---|
587 | * into |
---|
588 | * @param buffer The buffer containing the packet record |
---|
589 | * (including the capture format header) |
---|
590 | * @param rt_type The RT type for the packet |
---|
591 | * @param flags Flags describing properties that should be |
---|
592 | * applied to the new packet |
---|
593 | * @return 0 if successful, -1 if an error occurs. |
---|
594 | * |
---|
595 | * Updates internal trace and packet details, such as payload pointers, |
---|
596 | * loss counters and packet types to match the packet record provided |
---|
597 | * in the buffer. This is a zero-copy function. |
---|
598 | * |
---|
599 | * Intended (at this stage) only for internal use, particularly by |
---|
600 | * RT which needs to decapsulate RT packets */ |
---|
601 | int (*prepare_packet)(libtrace_t *libtrace, libtrace_packet_t *packet, |
---|
602 | void *buffer, libtrace_rt_types_t rt_type, |
---|
603 | uint32_t flags); |
---|
604 | |
---|
605 | /** Frees any resources allocated by the capture format module for a |
---|
606 | * libtrace packet. |
---|
607 | * |
---|
608 | * @param The packet to be finalised |
---|
609 | * */ |
---|
610 | void (*fin_packet)(libtrace_packet_t *packet); |
---|
611 | |
---|
612 | /** Write a libtrace packet to an output trace. |
---|
613 | * |
---|
614 | * @param libtrace The output trace to write the packet to |
---|
615 | * @param packet The packet to be written out |
---|
616 | * @return The number of bytes written, or -1 if an error occurs |
---|
617 | */ |
---|
618 | int (*write_packet)(libtrace_out_t *libtrace, libtrace_packet_t *packet); |
---|
619 | /** Returns the libtrace link type for a packet. |
---|
620 | * |
---|
621 | * @param packet The packet to get the link type for |
---|
622 | * @return The libtrace link type, or -1 if this link type is unknown |
---|
623 | */ |
---|
624 | libtrace_linktype_t (*get_link_type)(const libtrace_packet_t *packet); |
---|
625 | |
---|
626 | /** Returns the direction of a packet. |
---|
627 | * |
---|
628 | * @param packet The packet to get the direction for |
---|
629 | * @return The direction of the packet, or -1 if no direction tag is |
---|
630 | * present or an error occurs |
---|
631 | */ |
---|
632 | libtrace_direction_t (*get_direction)(const libtrace_packet_t *packet); |
---|
633 | |
---|
634 | /** Sets the direction of a packet. |
---|
635 | * |
---|
636 | * @param packet The packet to set the direction for |
---|
637 | * @param direction The direction to assign to the packet |
---|
638 | * @return The updated direction for the packet, or -1 if an error |
---|
639 | * occurs |
---|
640 | * |
---|
641 | * @note Some capture formats do not feature direction tagging, so it |
---|
642 | * will not make sense to implement a set_direction function for them. |
---|
643 | */ |
---|
644 | libtrace_direction_t (*set_direction)(libtrace_packet_t *packet, libtrace_direction_t direction); |
---|
645 | |
---|
646 | /** Returns the timestamp for a packet in the ERF timestamp format. |
---|
647 | * |
---|
648 | * @param packet The packet to get the timestamp from |
---|
649 | * @return The 64-bit ERF timestamp |
---|
650 | * |
---|
651 | * @note Each format must implement at least one of the four "get |
---|
652 | * timestamp" functions. |
---|
653 | * |
---|
654 | * If not implemented, libtrace will convert the result of one of the |
---|
655 | * other timestamp functions into the appropriate format instead. |
---|
656 | * This means each capture format only needs to implement the most |
---|
657 | * sensible of the four and let libtrace handle any conversions. |
---|
658 | * |
---|
659 | */ |
---|
660 | uint64_t (*get_erf_timestamp)(const libtrace_packet_t *packet); |
---|
661 | |
---|
662 | /** Returns the timestamp for a packet in the timeval format |
---|
663 | * |
---|
664 | * @param packet The packet to get the timestamp from |
---|
665 | * @return The timestamp from the packet as a timeval |
---|
666 | * |
---|
667 | * @note Each format must implement at least one of the four "get |
---|
668 | * timestamp" functions. |
---|
669 | * |
---|
670 | * If not implemented, libtrace will convert the result of one of the |
---|
671 | * other timestamp functions into the appropriate format instead. |
---|
672 | * This means each capture format only needs to implement the most |
---|
673 | * sensible of the four and let libtrace handle any conversions. |
---|
674 | */ |
---|
675 | struct timeval (*get_timeval)(const libtrace_packet_t *packet); |
---|
676 | |
---|
677 | /** Returns the timestamp for a packet in the timespec format. |
---|
678 | * |
---|
679 | * @param packet The packet to get the timestamp from |
---|
680 | * @return The timestamp from the packet as a timespec |
---|
681 | * |
---|
682 | * @note Each format must implement at least one of the four "get |
---|
683 | * timestamp" functions. |
---|
684 | * |
---|
685 | * If not implemented, libtrace will convert the result of one of the |
---|
686 | * other timestamp functions into the appropriate format instead. |
---|
687 | * This means each capture format only needs to implement the most |
---|
688 | * sensible of the four and let libtrace handle any conversions. |
---|
689 | */ |
---|
690 | struct timespec (*get_timespec)(const libtrace_packet_t *packet); |
---|
691 | |
---|
692 | /** Returns the timestamp for a packet in floating point seconds. |
---|
693 | * |
---|
694 | * @param packet The packet to get the timestamp from |
---|
695 | * @return The timestamp from the packet as a floating point number of |
---|
696 | * seconds since 1970-01-01 00:00:00 UTC |
---|
697 | * |
---|
698 | * @note Each format must implement at least one of the four "get |
---|
699 | * timestamp" functions. |
---|
700 | * |
---|
701 | * If not implemented, libtrace will convert the result of one of the |
---|
702 | * other timestamp functions into the appropriate format instead. |
---|
703 | * This means each capture format only needs to implement the most |
---|
704 | * sensible of the four and let libtrace handle any conversions. |
---|
705 | */ |
---|
706 | double (*get_seconds)(const libtrace_packet_t *packet); |
---|
707 | |
---|
708 | /** Moves the read pointer to a certain ERF timestamp within an input |
---|
709 | * trace file. |
---|
710 | * |
---|
711 | * @param trace The input trace to seek within |
---|
712 | * @param timestamp The timestamp to seek to, as an ERF timestamp |
---|
713 | * |
---|
714 | * @return 0 on success, -1 on failure. |
---|
715 | * |
---|
716 | * The next packet read from this trace will now be the first packet |
---|
717 | * to have a timestamp equal to or greater than the provided timestamp. |
---|
718 | * |
---|
719 | * @note Each format that supports seeking must implement at least one |
---|
720 | * of the seek functions. |
---|
721 | * |
---|
722 | * If not implemented, libtrace will convert the timestamp into the |
---|
723 | * appropriate format to use a seek function that has been implemented. |
---|
724 | * This means each capture format only needs to implement the seek |
---|
725 | * function that matches the native timestamp format for that capture. |
---|
726 | * |
---|
727 | */ |
---|
728 | int (*seek_erf)(libtrace_t *trace, uint64_t timestamp); |
---|
729 | /** Moves the read pointer to a certain timestamp represented using a |
---|
730 | * timeval within an input trace file. |
---|
731 | * |
---|
732 | * @param trace The input trace to seek within |
---|
733 | * @param timestamp The timestamp to seek to, as a timeval |
---|
734 | * |
---|
735 | * @return 0 on success, -1 on failure. |
---|
736 | * |
---|
737 | * The next packet read from this trace will now be the first packet |
---|
738 | * to have a timestamp equal to or greater than the provided timestamp. |
---|
739 | * |
---|
740 | * @note Each format that supports seeking must implement at least one |
---|
741 | * of the seek functions. |
---|
742 | * |
---|
743 | * If not implemented, libtrace will convert the timestamp into the |
---|
744 | * appropriate format to use a seek function that has been implemented. |
---|
745 | * This means each capture format only needs to implement the seek |
---|
746 | * function that matches the native timestamp format for that capture. |
---|
747 | * |
---|
748 | */ |
---|
749 | int (*seek_timeval)(libtrace_t *trace, struct timeval tv); |
---|
750 | |
---|
751 | /** Moves the read pointer to a certain timestamp represented using |
---|
752 | * floating point seconds within an input trace file. |
---|
753 | * |
---|
754 | * @param trace The input trace to seek within |
---|
755 | * @param timestamp The timestamp to seek to, as floating point |
---|
756 | * seconds since 1970-01-01 00:00:00 UTC |
---|
757 | * |
---|
758 | * @return 0 on success, -1 on failure. |
---|
759 | * |
---|
760 | * The next packet read from this trace will now be the first packet |
---|
761 | * to have a timestamp equal to or greater than the provided timestamp. |
---|
762 | * |
---|
763 | * @note Each format that supports seeking must implement at least one |
---|
764 | * of the seek functions. |
---|
765 | * |
---|
766 | * If not implemented, libtrace will convert the timestamp into the |
---|
767 | * appropriate format to use a seek function that has been implemented. |
---|
768 | * This means each capture format only needs to implement the seek |
---|
769 | * function that matches the native timestamp format for that capture. |
---|
770 | * |
---|
771 | */ |
---|
772 | int (*seek_seconds)(libtrace_t *trace, double seconds); |
---|
773 | |
---|
774 | /** Returns the payload length of the captured packet record. |
---|
775 | * |
---|
776 | * @param packet The packet to get the capture length from |
---|
777 | * @return The capture length for the packet, or -1 if an error occurs |
---|
778 | * |
---|
779 | * Capture length is the current size of the packet record itself, |
---|
780 | * following any truncation that may have occurred during the capture |
---|
781 | * process. This length does not include the capture format framing |
---|
782 | * header. |
---|
783 | */ |
---|
784 | int (*get_capture_length)(const libtrace_packet_t *packet); |
---|
785 | |
---|
786 | /** Returns the original length of the packet as it was on the wire. |
---|
787 | * |
---|
788 | * @param packet The packet to get the wire length from |
---|
789 | * @return The length of the packet on the wire at the time of capture, |
---|
790 | * or -1 if an error occurs |
---|
791 | * |
---|
792 | * Wire length is the original size of the packet prior to any |
---|
793 | * truncation that may have occurred as part of the capture process. |
---|
794 | * This length does not include the capture format framing header. |
---|
795 | */ |
---|
796 | int (*get_wire_length)(const libtrace_packet_t *packet); |
---|
797 | |
---|
798 | /** Returns the length of the capture format framing header |
---|
799 | * |
---|
800 | * @param packet The packet to get the framing length from |
---|
801 | * @return The length of the framing header, or -1 if an error occurs |
---|
802 | * |
---|
803 | * The framing header is the extra metadata that the capture process |
---|
804 | * records about a packet. The framing length does not include any |
---|
805 | * of the packet payload itself. The total size of the packet record |
---|
806 | * can be calculated be adding this value with the capture length. |
---|
807 | */ |
---|
808 | int (*get_framing_length)(const libtrace_packet_t *packet); |
---|
809 | |
---|
810 | /** Sets the capture length for a packet. |
---|
811 | * |
---|
812 | * @param packet The packet to adjust the capture length for. |
---|
813 | * @param size The new capture length |
---|
814 | * @return The new capture length of the packet, or -1 if an error |
---|
815 | * occurs |
---|
816 | * |
---|
817 | * @note This function should only reduce the capture length. If the |
---|
818 | * provided length is larger than the current capture length, -1 should |
---|
819 | * be returned. |
---|
820 | */ |
---|
821 | size_t (*set_capture_length)(struct libtrace_packet_t *packet,size_t size); |
---|
822 | /** Returns the number of packets observed by an input trace. |
---|
823 | * |
---|
824 | * @param trace The input trace to get the packet count for |
---|
825 | * @return The number of packets observed by an input trace, or |
---|
826 | * UINT64_MAX if the number is unknown |
---|
827 | * |
---|
828 | * This count includes packets that have been filtered and dropped. |
---|
829 | */ |
---|
830 | uint64_t (*get_received_packets)(libtrace_t *trace); |
---|
831 | |
---|
832 | /** Returns the number of packets filtered by an input trace. |
---|
833 | * |
---|
834 | * @param trace The input trace to get the filtered count for |
---|
835 | * @return The number of packets filtered by the input trace, or |
---|
836 | * UINT64_MAX if the number is unknown |
---|
837 | * |
---|
838 | */ |
---|
839 | uint64_t (*get_filtered_packets)(libtrace_t *trace); |
---|
840 | |
---|
841 | /** Returns the number of packets dropped by an input trace. |
---|
842 | * |
---|
843 | * @param trace The input trace to get the dropped count for |
---|
844 | * @return The number of packets dropped by the input trace, or |
---|
845 | * UINT64_MAX if the number is unknown |
---|
846 | * |
---|
847 | */ |
---|
848 | uint64_t (*get_dropped_packets)(libtrace_t *trace); |
---|
849 | |
---|
850 | /** Returns statistics about a trace. |
---|
851 | * |
---|
852 | * @param trace The libtrace object |
---|
853 | * @param stat [in,out] A statistics structure ready to be filled |
---|
854 | * |
---|
855 | * The filtered and accepted statistics will be set to the values |
---|
856 | * stored in the library. All other statistics are not set. |
---|
857 | * |
---|
858 | * @note If filtering of packets is performed by a trace and the number |
---|
859 | * of filtered packets is unknown this should be marked as invalid by |
---|
860 | * the format. |
---|
861 | */ |
---|
862 | void (*get_statistics)(libtrace_t *trace, libtrace_stat_t *stat); |
---|
863 | |
---|
864 | /** Returns the file descriptor used by the input trace. |
---|
865 | * |
---|
866 | * @param trace The input trace to get the file descriptor for |
---|
867 | * @return The file descriptor used by the input trace to read packets |
---|
868 | * |
---|
869 | */ |
---|
870 | int (*get_fd)(const libtrace_t *trace); |
---|
871 | |
---|
872 | /** Returns the next libtrace event for the input trace. |
---|
873 | * |
---|
874 | * @param trace The input trace to get the next event from |
---|
875 | * @param packet A libtrace packet to read a packet into |
---|
876 | * @return A libtrace event describing the event that occured |
---|
877 | * |
---|
878 | * The event API allows for non-blocking reading of packets from an |
---|
879 | * input trace. If a packet is available and ready to be read, a packet |
---|
880 | * event should be returned. Otherwise a sleep or fd event should be |
---|
881 | * returned to indicate that the caller needs to wait. If the input |
---|
882 | * trace has an error or reaches EOF, a terminate event should be |
---|
883 | * returned. |
---|
884 | */ |
---|
885 | struct libtrace_eventobj_t (*trace_event)(libtrace_t *trace, libtrace_packet_t *packet); |
---|
886 | |
---|
887 | /** Prints some useful help information to standard output. */ |
---|
888 | void (*help)(void); |
---|
889 | |
---|
890 | /** Next pointer, should always be NULL - used by the format module |
---|
891 | * manager. */ |
---|
892 | struct libtrace_format_t *next; |
---|
893 | |
---|
894 | /** Holds information about the trace format */ |
---|
895 | struct libtrace_info_t info; |
---|
896 | |
---|
897 | /** |
---|
898 | * Starts or unpauses an input trace in parallel mode - note that |
---|
899 | * this function is often the one that opens the file or device for |
---|
900 | * reading. |
---|
901 | * |
---|
902 | * @param libtrace The input trace to be started or unpaused |
---|
903 | * @return 0 upon success. |
---|
904 | * Otherwise in event of an error -1 is returned. |
---|
905 | * |
---|
906 | */ |
---|
907 | int (*pstart_input)(libtrace_t *trace); |
---|
908 | |
---|
909 | /** |
---|
910 | * Read a batch of packets from the input stream related to thread. |
---|
911 | * At most read nb_packets, however should return with less if packets |
---|
912 | * are not waiting. However still must return at least 1, 0 still indicates |
---|
913 | * EOF. |
---|
914 | * |
---|
915 | * @param libtrace The input trace |
---|
916 | * @param t The thread |
---|
917 | * @param packets An array of packets |
---|
918 | * @param nb_packets The number of packets in the array (the maximum to read) |
---|
919 | * @return The number of packets read, or 0 in the case of EOF or -1 in error or -2 to represent |
---|
920 | * interrupted due to message waiting before packets had been read. |
---|
921 | */ |
---|
922 | int (*pread_packets)(libtrace_t *trace, libtrace_thread_t *t, libtrace_packet_t **packets, size_t nb_packets); |
---|
923 | |
---|
924 | /** Pause a parallel trace |
---|
925 | * |
---|
926 | * @param libtrace The input trace to be paused |
---|
927 | */ |
---|
928 | int (*ppause_input)(libtrace_t *trace); |
---|
929 | |
---|
930 | /** Called after all threads have been paused, Finish (close) a parallel trace |
---|
931 | * |
---|
932 | * @param libtrace The input trace to be stopped |
---|
933 | */ |
---|
934 | int (*pfin_input)(libtrace_t *trace); |
---|
935 | |
---|
936 | /** |
---|
937 | * Register a thread for use with the format or using the packets produced |
---|
938 | * by it. This is NOT only used for threads reading packets in fact all |
---|
939 | * threads use this. |
---|
940 | * |
---|
941 | * The libtrace lock is not held by this format but can be aquired |
---|
942 | * by the format. |
---|
943 | * |
---|
944 | * Some use cases include setting up any thread local storage required for |
---|
945 | * to read packets and free packets. For DPDK we require any thread that |
---|
946 | * may release or read a packet to have have an internal number associated |
---|
947 | * with it. |
---|
948 | * |
---|
949 | * The thread type can be used to see if this thread is going to be used |
---|
950 | * to read packets or otherwise. |
---|
951 | * |
---|
952 | * @return 0 if successful, -1 if the option is unsupported or an error |
---|
953 | * occurs (such as a maximum of threads being reached) |
---|
954 | */ |
---|
955 | int (*pregister_thread)(libtrace_t *libtrace, libtrace_thread_t *t, bool reader); |
---|
956 | |
---|
957 | /** |
---|
958 | * If needed any memory allocated with pregister_thread can be released |
---|
959 | * in this function. The thread will be destroyed directly after this |
---|
960 | * function is called. |
---|
961 | */ |
---|
962 | void (*punregister_thread)(libtrace_t *libtrace, libtrace_thread_t *t); |
---|
963 | |
---|
964 | /** Returns statistics for a single thread. |
---|
965 | * |
---|
966 | * @param trace The libtrace object |
---|
967 | * @param t The thread to return statistics for |
---|
968 | * @param stat [in,out] A statistics structure ready to be filled |
---|
969 | * |
---|
970 | * The filtered and accepted statistics will be set to the values |
---|
971 | * stored in the library. All other statistics are not set. |
---|
972 | * |
---|
973 | * @note If filtering of packets is performed by a trace and the number |
---|
974 | * of filtered packets is unknown this should be marked as invalid by |
---|
975 | * the format. |
---|
976 | */ |
---|
977 | void (*get_thread_statistics)(libtrace_t *libtrace, |
---|
978 | libtrace_thread_t *t, |
---|
979 | libtrace_stat_t *stat); |
---|
980 | }; |
---|
981 | |
---|
982 | /** Macro to zero out a single thread format */ |
---|
983 | #define NON_PARALLEL(live) \ |
---|
984 | {live, 1}, /* trace info */ \ |
---|
985 | NULL, /* pstart_input */ \ |
---|
986 | NULL, /* pread_packet */ \ |
---|
987 | NULL, /* ppause_input */ \ |
---|
988 | NULL, /* pfin_input */ \ |
---|
989 | NULL, /* pregister_thread */ \ |
---|
990 | NULL, /* punregister_thread */ \ |
---|
991 | NULL, /* get_thread_statistics */ |
---|
992 | |
---|
993 | /** The list of registered capture formats */ |
---|
994 | //extern struct libtrace_format_t *form; |
---|
995 | |
---|
996 | /** Specifies whether any blocking packet readers should cease reading |
---|
997 | * immediately |
---|
998 | */ |
---|
999 | extern volatile int libtrace_halt; |
---|
1000 | |
---|
1001 | /** |
---|
1002 | * Used by a format to check if trace_interrupt or if a trace_pause/stop has |
---|
1003 | * been called. Provides backwards compatibility with traditional read |
---|
1004 | * functions when trace_read_packet() is used by the parallel API. |
---|
1005 | * |
---|
1006 | * Returns -1 if not halting otherwise returns the code that the read |
---|
1007 | * operation should pass on. |
---|
1008 | */ |
---|
1009 | static inline int is_halted(libtrace_t *trace) { |
---|
1010 | if (!(libtrace_halt || trace->state == STATE_PAUSING)) { |
---|
1011 | return -1; |
---|
1012 | } else if (libtrace_halt) { |
---|
1013 | return READ_EOF; |
---|
1014 | } else { |
---|
1015 | return READ_MESSAGE; |
---|
1016 | } |
---|
1017 | } |
---|
1018 | |
---|
1019 | /** Registers a new capture format module. |
---|
1020 | * |
---|
1021 | * @param format The format module to be registered |
---|
1022 | */ |
---|
1023 | void register_format(struct libtrace_format_t *format); |
---|
1024 | |
---|
1025 | /** Converts a timeval into a timestamp in microseconds since the epoch. |
---|
1026 | * |
---|
1027 | * @param tv The timeval to be converted. |
---|
1028 | * @return A 64 bit timestamp in microseconds since the epoch. |
---|
1029 | */ |
---|
1030 | uint64_t tv_to_usec(const struct timeval *tv); |
---|
1031 | |
---|
1032 | /** Converts a PCAP DLT into a libtrace link type. |
---|
1033 | * |
---|
1034 | * @param linktype The PCAP DLT to be converted |
---|
1035 | * @return The libtrace link type that is equivalent to the provided DLT, or |
---|
1036 | * -1 if the DLT is unknown |
---|
1037 | */ |
---|
1038 | libtrace_linktype_t pcap_linktype_to_libtrace(libtrace_dlt_t linktype); |
---|
1039 | |
---|
1040 | /** Converts a PCAP DLT into an RT protocol type. |
---|
1041 | * |
---|
1042 | * @param linktype The PCAP DLT to be converted |
---|
1043 | * @return The RT type that is equivalent to the provided DLT |
---|
1044 | */ |
---|
1045 | libtrace_rt_types_t pcap_linktype_to_rt(libtrace_dlt_t linktype); |
---|
1046 | |
---|
1047 | /** Converts a PCAP-NG DLT into an RT protocol type. |
---|
1048 | * |
---|
1049 | * @param linktype The PCAP DLT to be converted |
---|
1050 | * @return The RT type that is equivalent to the provided DLT |
---|
1051 | */ |
---|
1052 | libtrace_rt_types_t pcapng_linktype_to_rt(libtrace_dlt_t linktype); |
---|
1053 | |
---|
1054 | /** Converts a libtrace link type into a PCAP linktype. |
---|
1055 | * |
---|
1056 | * @param type The libtrace link type to be converted |
---|
1057 | * @return The PCAP linktype that is equivalent to the provided libtrace link |
---|
1058 | * type, or -1 if the link type is unknown |
---|
1059 | */ |
---|
1060 | libtrace_dlt_t libtrace_to_pcap_linktype(libtrace_linktype_t type); |
---|
1061 | |
---|
1062 | /** Converts a libtrace link type into a PCAP DLT. |
---|
1063 | * |
---|
1064 | * @param type The libtrace link type to be converted |
---|
1065 | * @return The PCAP DLT that is equivalent to the provided libtrace link |
---|
1066 | * type, or -1 if the link type is unknown |
---|
1067 | */ |
---|
1068 | libtrace_dlt_t libtrace_to_pcap_dlt(libtrace_linktype_t type); |
---|
1069 | |
---|
1070 | /** Converts an RT protocol type into a PCAP DLT. |
---|
1071 | * |
---|
1072 | * @param rt_type The RT type to be converted |
---|
1073 | * @return The PCAP DLT that is equivalent to the provided RT protocol |
---|
1074 | */ |
---|
1075 | libtrace_dlt_t rt_to_pcap_linktype(libtrace_rt_types_t rt_type); |
---|
1076 | |
---|
1077 | /** Converts a PCAP DLT into an RT protocol type for the BPF format. |
---|
1078 | * |
---|
1079 | * @param linktype The PCAP DLT to be converted |
---|
1080 | * @return The RT type that is equivalent to the provided DLT for BPF |
---|
1081 | */ |
---|
1082 | libtrace_rt_types_t bpf_linktype_to_rt(libtrace_dlt_t linktype); |
---|
1083 | |
---|
1084 | /** Converts an ERF type into a libtrace link type. |
---|
1085 | * |
---|
1086 | * @param erf The ERF type to be converted |
---|
1087 | * @return The libtrace link type that is equivalent to the provided ERF type, |
---|
1088 | * or -1 if the ERF type is unknown |
---|
1089 | */ |
---|
1090 | libtrace_linktype_t erf_type_to_libtrace(uint8_t erf); |
---|
1091 | |
---|
1092 | /** Converts a libtrace link type into an ERF type. |
---|
1093 | * |
---|
1094 | * @param linktype The libtrace link type to be converted |
---|
1095 | * @return The ERF type that is equivalent to the provided libtrace link type, |
---|
1096 | * or -1 if the link type cannot be matched to an ERF type. |
---|
1097 | */ |
---|
1098 | uint8_t libtrace_to_erf_type(libtrace_linktype_t linktype); |
---|
1099 | |
---|
1100 | /** Converts an ARPHRD type into a libtrace link type. |
---|
1101 | * |
---|
1102 | * @param arphrd The ARPHRD type to be converted |
---|
1103 | * @return The libtrace link type that is equivalent to the provided ARPHRD |
---|
1104 | * type, or -1 if the ARPHRD type is unknown |
---|
1105 | */ |
---|
1106 | libtrace_linktype_t arphrd_type_to_libtrace(unsigned int arphrd); |
---|
1107 | |
---|
1108 | /** Converts a libtrace link type into an ARPHRD type. |
---|
1109 | * |
---|
1110 | * @param type The libtrace link type to be converted |
---|
1111 | * @return The ARPHRD type that is equivalent to the provided libtrace link |
---|
1112 | * type, or -1 if the link type cannot be matched to an ARPHRD type |
---|
1113 | */ |
---|
1114 | unsigned int libtrace_to_arphrd_type(libtrace_linktype_t type); |
---|
1115 | |
---|
1116 | /** Converts a libtrace packet to the Linux SLL type. |
---|
1117 | * |
---|
1118 | * @param packet The packet to be promoted |
---|
1119 | * |
---|
1120 | * @note This will involve memcpy() so use sparingly. |
---|
1121 | * |
---|
1122 | * This function prepends a Linux SLL header to a packet so that we can store |
---|
1123 | * direction tagging information. |
---|
1124 | */ |
---|
1125 | void promote_packet(libtrace_packet_t *packet); |
---|
1126 | |
---|
1127 | /** Attempts to demote a packet by removing the first header. |
---|
1128 | * |
---|
1129 | * @param packet The packet to be demoted |
---|
1130 | * @return True if the packet was demoted, false otherwise. |
---|
1131 | * |
---|
1132 | * Essentially the opposite of promote_packet, except that it will also remove |
---|
1133 | * an ATM header as well as Linux SLL. |
---|
1134 | * |
---|
1135 | */ |
---|
1136 | bool demote_packet(libtrace_packet_t *packet); |
---|
1137 | |
---|
1138 | /** Returns a pointer to the header following a Linux SLL header. |
---|
1139 | * |
---|
1140 | * @param link A pointer to the Linux SLL header to be skipped |
---|
1141 | * @param[out] arphrd_type The arp hardware type of the packet |
---|
1142 | * @param[out] next_header The ethertype of the next header |
---|
1143 | * @param[in,out] remaining Updated with the number of captured bytes |
---|
1144 | * remaining |
---|
1145 | * @return A pointer to the header following the Linux SLL header, or NULL if |
---|
1146 | * no subsequent header is present. |
---|
1147 | * |
---|
1148 | * Remaining must point to the number of bytes captured from the Linux SLL |
---|
1149 | * header and beyond. It will be decremented by the number of bytes skipped |
---|
1150 | * to find the payload. |
---|
1151 | * |
---|
1152 | * If the Linux SLL header is complete but there are zero bytes of payload |
---|
1153 | * after the end of the header, a pointer to where the payload would be is |
---|
1154 | * returned and remaining will be set to zero. If the Linux SLL header is |
---|
1155 | * incomplete (truncated), then NULL is returned and remaining will be set to |
---|
1156 | * 0. Therefore, it is very important to check the value of remaining after |
---|
1157 | * calling this function. |
---|
1158 | */ |
---|
1159 | void *trace_get_payload_from_linux_sll(const void *link, |
---|
1160 | uint16_t *arphrd_type, |
---|
1161 | uint16_t *next_header, |
---|
1162 | uint32_t *remaining); |
---|
1163 | |
---|
1164 | /** Returns a pointer to the header following an ATM header. |
---|
1165 | * |
---|
1166 | * @param link A pointer to the ATM header to be skipped |
---|
1167 | * @param[out] type The ethertype of the next header |
---|
1168 | * @param[in,out] remaining Updated with the number of captured bytes |
---|
1169 | * remaining |
---|
1170 | * @return A pointer to the header following the ATM header, or NULL if |
---|
1171 | * no subsequent header is present. |
---|
1172 | * |
---|
1173 | * Remaining must point to the number of bytes captured from the ATM header |
---|
1174 | * and beyond. It will be decremented by the number of bytes skipped to find |
---|
1175 | * the payload. |
---|
1176 | * |
---|
1177 | * If the ATM header is complete but there are zero bytes of payload |
---|
1178 | * after the end of the header, a pointer to where the payload would be is |
---|
1179 | * returned and remaining will be set to zero. If the ATM header is |
---|
1180 | * incomplete (truncated), then NULL is returned and remaining will be set to |
---|
1181 | * 0. Therefore, it is very important to check the value of remaining after |
---|
1182 | * calling this function. |
---|
1183 | */ |
---|
1184 | DLLEXPORT void *trace_get_payload_from_atm(void *link, uint8_t *type, |
---|
1185 | uint32_t *remaining); |
---|
1186 | |
---|
1187 | |
---|
1188 | #ifdef HAVE_BPF |
---|
1189 | /* A type encapsulating a bpf filter |
---|
1190 | * This type covers the compiled bpf filter, as well as the original filter |
---|
1191 | * string |
---|
1192 | * |
---|
1193 | */ |
---|
1194 | |
---|
1195 | /** Internal representation of a BPF filter */ |
---|
1196 | struct libtrace_filter_t { |
---|
1197 | struct bpf_program filter; /**< The BPF program itself */ |
---|
1198 | char * filterstring; /**< The filter string */ |
---|
1199 | int flag; /**< Indicates if the filter is valid */ |
---|
1200 | struct bpf_jit_t *jitfilter; |
---|
1201 | }; |
---|
1202 | #else |
---|
1203 | /** BPF not supported by this system, but we still need to define a structure |
---|
1204 | * for the filter */ |
---|
1205 | struct libtrace_filter_t {}; |
---|
1206 | #endif |
---|
1207 | |
---|
1208 | /** Local definition of a PCAP header */ |
---|
1209 | typedef struct libtrace_pcapfile_pkt_hdr_t { |
---|
1210 | uint32_t ts_sec; /* Seconds portion of the timestamp */ |
---|
1211 | uint32_t ts_usec; /* Microseconds portion of the timestamp */ |
---|
1212 | uint32_t caplen; /* Capture length of the packet */ |
---|
1213 | uint32_t wirelen; /* The wire length of the packet */ |
---|
1214 | } libtrace_pcapfile_pkt_hdr_t; |
---|
1215 | |
---|
1216 | #ifdef HAVE_DAG |
---|
1217 | /** Constructor for the DAG format module */ |
---|
1218 | void dag_constructor(void); |
---|
1219 | #endif |
---|
1220 | /** Constructor for the ERF format module */ |
---|
1221 | void erf_constructor(void); |
---|
1222 | /** Constructor for the TSH format module */ |
---|
1223 | void tsh_constructor(void); |
---|
1224 | /** Constructor for the Legacy DAG format module */ |
---|
1225 | void legacy_constructor(void); |
---|
1226 | /** Constructor for the Linux Native format module */ |
---|
1227 | void linuxnative_constructor(void); |
---|
1228 | /** Constructor for the Linux Ring format module */ |
---|
1229 | void linuxring_constructor(void); |
---|
1230 | /** Constructor for the PCAP format module */ |
---|
1231 | void pcap_constructor(void); |
---|
1232 | /** Constructor for the PCAP File format module */ |
---|
1233 | void pcapfile_constructor(void); |
---|
1234 | /** Constructor for the PCAP-NG File format module */ |
---|
1235 | void pcapng_constructor(void); |
---|
1236 | /** Constructor for the RT format module */ |
---|
1237 | void rt_constructor(void); |
---|
1238 | /** Constructor for the DUCK format module */ |
---|
1239 | void duck_constructor(void); |
---|
1240 | /** Constructor for the ATM Header format module */ |
---|
1241 | void atmhdr_constructor(void); |
---|
1242 | /** Constructor for the network DAG format module */ |
---|
1243 | void ndag_constructor(void); |
---|
1244 | #ifdef HAVE_BPF |
---|
1245 | /** Constructor for the BPF format module */ |
---|
1246 | void bpf_constructor(void); |
---|
1247 | #endif |
---|
1248 | #if HAVE_DPDK |
---|
1249 | /** Constructor for Intels DPDK format module */ |
---|
1250 | void dpdk_constructor(void); |
---|
1251 | |
---|
1252 | /** Constructor for receiving network DAG via Intels DPDK format module */ |
---|
1253 | void dpdkndag_constructor(void); |
---|
1254 | |
---|
1255 | #endif |
---|
1256 | |
---|
1257 | /** Extracts the RadioTap flags from a wireless link header |
---|
1258 | * |
---|
1259 | * @param link A pointer to the wireless link header |
---|
1260 | * @param linktype The link type of the wireless header |
---|
1261 | * @param[out] flags Space to store the extracted flags |
---|
1262 | * @return True if libtrace was able to extract flags from the link header, |
---|
1263 | * false otherwise. |
---|
1264 | * |
---|
1265 | * This function has been left internal because it is not portable across |
---|
1266 | * drivers. |
---|
1267 | */ |
---|
1268 | bool trace_get_wireless_flags(void *link, libtrace_linktype_t linktype, uint8_t *flags); |
---|
1269 | #define TRACE_RADIOTAP_F_FCS 0x10 |
---|
1270 | |
---|
1271 | #ifdef __cplusplus |
---|
1272 | } |
---|
1273 | #endif |
---|
1274 | |
---|
1275 | #endif /* LIBTRACE_INT_H */ |
---|