1 | /* |
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2 | * This file is part of libtrace |
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3 | * |
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4 | * Copyright (c) 2007,2008 The University of Waikato, Hamilton, New Zealand. |
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5 | * Authors: Daniel Lawson |
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6 | * Perry Lorier |
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7 | * |
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8 | * All rights reserved. |
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9 | * |
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10 | * This code has been developed by the University of Waikato WAND |
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11 | * research group. For further information please see http://www.wand.net.nz/ |
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12 | * |
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13 | * libtrace is free software; you can redistribute it and/or modify |
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14 | * it under the terms of the GNU General Public License as published by |
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15 | * the Free Software Foundation; either version 2 of the License, or |
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16 | * (at your option) any later version. |
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17 | * |
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18 | * libtrace is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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21 | * GNU General Public License for more details. |
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22 | * |
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23 | * You should have received a copy of the GNU General Public License |
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24 | * along with libtrace; if not, write to the Free Software |
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25 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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26 | * |
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27 | * $Id$ |
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28 | * |
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29 | */ |
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30 | /** @file */ |
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31 | |
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32 | #ifndef LIBTRACE_INT_H |
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33 | #define LIBTRACE_INT_H |
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34 | |
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35 | #ifdef __cplusplus |
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36 | extern "C" { |
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37 | #endif |
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38 | |
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39 | #include "common.h" |
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40 | #include "config.h" |
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41 | #include "libtrace.h" |
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42 | |
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43 | #ifdef _MSC_VER |
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44 | // warning: deprecated function |
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45 | #pragma warning(disable:4996) |
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46 | // warning: benign redefinitions of types |
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47 | #pragma warning(disable:4142) |
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48 | #endif |
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49 | |
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50 | #ifdef HAVE_INTTYPES_H |
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51 | # include <inttypes.h> |
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52 | #else |
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53 | # include "lt_inttypes.h" |
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54 | #endif |
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55 | |
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56 | #ifdef HAVE_STDDEF_H |
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57 | # include <stddef.h> |
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58 | #else |
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59 | #ifndef WIN32 |
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60 | # error "Can't find stddev.h -- do you define ptrdiff_t elsewhere?" |
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61 | #endif |
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62 | #endif |
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63 | |
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64 | |
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65 | #include "rt_protocol.h" |
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66 | |
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67 | /* Prefer net/bpf.h over pcap-bpf.h for format_bpf.c on MacOS */ |
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68 | #ifdef HAVE_NET_BPF_H |
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69 | # include <net/bpf.h> |
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70 | # define HAVE_BPF 1 |
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71 | #else |
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72 | #ifdef HAVE_PCAP_BPF_H |
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73 | # include <pcap-bpf.h> |
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74 | # define HAVE_BPF 1 |
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75 | #endif |
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76 | #endif |
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77 | |
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78 | #ifdef HAVE_PCAP_H |
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79 | # include <pcap.h> |
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80 | # ifdef HAVE_PCAP_INT_H |
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81 | # include <pcap-int.h> |
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82 | # endif |
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83 | #endif |
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84 | |
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85 | #ifdef HAVE_ZLIB_H |
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86 | # include <zlib.h> |
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87 | #endif |
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88 | |
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89 | #ifndef HAVE_STRNCASECMP |
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90 | # ifndef HAVE__STRNICMP |
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91 | int strncasecmp(const char *str1, const char *str2, size_t n); |
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92 | # else |
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93 | # define strncasecmp _strnicmp |
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94 | # endif |
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95 | #endif |
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96 | |
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97 | #ifndef HAVE_SNPRINTF |
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98 | # ifndef HAVE_SPRINTF_S |
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99 | int snprintf(char *str, size_t size, const char *format, ...); |
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100 | # else |
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101 | # define snprintf sprintf_s |
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102 | # endif |
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103 | #endif |
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104 | |
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105 | #include "daglegacy.h" |
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106 | |
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107 | #ifdef HAVE_DAG_API |
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108 | # include "dagnew.h" |
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109 | # include "dagapi.h" |
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110 | # if DAG_VERSION == 25 |
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111 | # include <daginf.h> |
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112 | # else |
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113 | # include <erftypes.h> |
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114 | # endif |
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115 | #else |
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116 | # include "dagformat.h" |
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117 | #endif |
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118 | |
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119 | #define RP_BUFSIZE 65536U |
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120 | |
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121 | struct libtrace_event_status_t { |
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122 | libtrace_packet_t *packet; |
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123 | double tdelta; |
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124 | double trace_last_ts; |
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125 | int psize; |
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126 | }; |
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127 | |
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128 | /** The information about traces that are open |
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129 | * @internal |
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130 | */ |
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131 | struct libtrace_t { |
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132 | struct libtrace_format_t *format; /**< format driver pointer */ |
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133 | struct libtrace_event_status_t event; /**< the next event */ |
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134 | void *format_data; /**<format data pointer */ |
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135 | struct libtrace_filter_t *filter; /**< used by libtrace if the module |
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136 | * doesn't support filters natively |
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137 | */ |
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138 | size_t snaplen; /**< used by libtrace if the module |
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139 | * doesn't support snapping natively |
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140 | */ |
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141 | uint64_t accepted_packets; /**< Number of packets returned to the |
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142 | * user |
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143 | */ |
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144 | uint64_t filtered_packets; /**< Number of packets filtered by |
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145 | * libtrace |
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146 | */ |
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147 | char *uridata; /**< the uri of this trace */ |
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148 | |
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149 | libtrace_err_t err; /**< error information */ |
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150 | bool started; /**< if this trace has started */ |
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151 | }; |
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152 | |
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153 | /** Information about output traces |
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154 | * @internal |
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155 | */ |
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156 | struct libtrace_out_t { |
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157 | struct libtrace_format_t *format; /**< format driver */ |
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158 | void *format_data; /**< format data */ |
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159 | char *uridata; /**< URI associated with this trace */ |
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160 | libtrace_err_t err; /**< Associated error */ |
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161 | bool started; /**< trace started */ |
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162 | }; |
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163 | |
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164 | void trace_set_err(libtrace_t *trace, int errcode,const char *msg,...) |
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165 | PRINTF(3,4); |
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166 | void trace_set_err_out(libtrace_out_t *trace, int errcode, const char *msg,...) |
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167 | PRINTF(3,4); |
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168 | |
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169 | |
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170 | /* |
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171 | * |
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172 | * The basic idea of this function is that it will take the data pointed to |
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173 | * by 'buffer' and treat it as a packet of the same format type as the |
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174 | * libtrace_t pointed to by 'trace', including the format framing (e.g. an |
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175 | * erf header for erf and dag formats, a pcap header for pcap formats). |
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176 | * |
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177 | * The libtrace packet pointed to by 'packet' will then have its internal |
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178 | * pointers and values replaced with ones that describe the packet in 'buffer'. |
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179 | * |
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180 | * 'rt_type' is used to set packet->type while 'flags' is relatively |
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181 | * self-explanatory. Definitions of the accepted flags will be provided below. |
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182 | * |
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183 | * The primary use of this function is to allow rt_read_packet to nicely |
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184 | * convert packets from the RT format back to the format that they were |
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185 | * originally captured with, as RT essentially encapsulates the original trace |
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186 | * format. We've decided to not make this function available via the API |
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187 | * because there are a number of issues that can arise if it is not used |
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188 | * very carefully and there are few situations outside of the RT case where |
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189 | * you'd want to do something like this anyway. |
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190 | * |
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191 | * Returns 0 if successful, -1 if something goes horribly wrong |
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192 | */ |
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193 | int trace_prepare_packet(libtrace_t *trace, libtrace_packet_t *packet, |
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194 | void *buffer, libtrace_rt_types_t rt_type, uint32_t flags); |
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195 | |
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196 | /* Flags for prepare_packet functions */ |
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197 | /*-------------------------------------*/ |
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198 | /* If set, the memory pointed to by 'buffer' is malloc()'d and libtrace should |
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199 | * undertake ownership of that memory. If not set, the memory is treated as |
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200 | * externally-owned and will not be freed by libtrace when the packet is |
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201 | * destroyed. */ |
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202 | #define TRACE_PREP_OWN_BUFFER 1 |
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203 | |
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204 | |
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205 | typedef struct libtrace_sll_header_t { |
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206 | uint16_t pkttype; /* packet type */ |
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207 | uint16_t hatype; /* link-layer address type */ |
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208 | uint16_t halen; /* link-layer address length */ |
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209 | char addr[8]; /* link-layer address */ |
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210 | uint16_t protocol; /* protocol */ |
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211 | } libtrace_sll_header_t; |
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212 | |
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213 | #define TRACE_SLL_HOST 0 |
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214 | #define TRACE_SLL_BROADCAST 1 |
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215 | #define TRACE_SLL_MULTICAST 2 |
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216 | #define TRACE_SLL_OTHERHOST 3 |
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217 | #define TRACE_SLL_OUTGOING 4 |
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218 | |
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219 | #ifndef PF_RULESET_NAME_SIZE |
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220 | #define PF_RULESET_NAME_SIZE 16 |
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221 | #endif |
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222 | |
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223 | #ifndef IFNAMSIZ |
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224 | #define IFNAMSIZ 16 |
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225 | #endif |
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226 | |
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227 | typedef struct libtrace_pflog_header_t { |
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228 | uint8_t length; |
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229 | sa_family_t af; |
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230 | uint8_t action; |
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231 | uint8_t reason; |
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232 | char ifname[IFNAMSIZ]; |
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233 | char ruleset[PF_RULESET_NAME_SIZE]; |
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234 | uint32_t rulenr; |
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235 | uint32_t subrulenr; |
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236 | uint8_t dir; |
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237 | uint8_t pad[3]; |
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238 | } PACKED libtrace_pflog_header_t; |
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239 | |
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240 | |
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241 | |
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242 | /** Module definition structure */ |
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243 | /* all of these should return -1, or NULL on failure */ |
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244 | struct libtrace_format_t { |
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245 | /** the uri name of this module */ |
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246 | const char *name; |
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247 | /** the version of this module */ |
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248 | const char *version; |
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249 | /** the RT protocol type of this module */ |
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250 | enum base_format_t type; |
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251 | /** stuff that deals with input @{ */ |
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252 | /** initialise an trace (or NULL if input is not supported) */ |
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253 | int (*init_input)(libtrace_t *libtrace); |
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254 | /** configure an trace (or NULL if input is not supported) */ |
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255 | int (*config_input)(libtrace_t *libtrace,trace_option_t option,void *value); |
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256 | /** start/unpause an trace (or NULL if input not supported) */ |
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257 | int (*start_input)(libtrace_t *libtrace); |
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258 | /** pause an trace (or NULL if input not supported) */ |
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259 | int (*pause_input)(libtrace_t *libtrace); |
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260 | /** @} */ |
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261 | /** stuff that deals with output @{ */ |
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262 | /** initialise output traces (or NULL if output not supported) */ |
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263 | int (*init_output)(libtrace_out_t *libtrace); |
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264 | /** configure output traces (or NULL if output not supported) */ |
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265 | int (*config_output)(libtrace_out_t *libtrace, trace_option_output_t option, void *); |
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266 | /** start output traces (or NULL if output not supported) |
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267 | * There is no pause for output traces, as packets are not arriving |
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268 | * asyncronously |
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269 | */ |
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270 | int (*start_output)(libtrace_out_t *libtrace); |
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271 | /** @} */ |
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272 | /** finish an input trace, cleanup (or NULL if input not supported) |
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273 | * if the trace is not paused, libtrace will pause the trace before |
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274 | * calling this function. |
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275 | */ |
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276 | int (*fin_input)(libtrace_t *libtrace); |
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277 | /** finish an output trace, cleanup (or NULL if output not supported) */ |
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278 | int (*fin_output)(libtrace_out_t *libtrace); |
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279 | /** read a packet from a trace into the provided packet structure |
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280 | * @returns -1 on error, or get_framing_length()+get_capture_length() \ |
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281 | * on success. |
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282 | * if this function is not supported, this field may be NULL. |
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283 | */ |
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284 | int (*read_packet)(libtrace_t *libtrace, libtrace_packet_t *packet); |
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285 | /** prepares a packet for general libtrace usage |
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286 | * updates internal trace and packet details, such as payload pointers, |
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287 | * loss counters and packet types. |
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288 | * Intended (at this stage) only for internal use, particularly by |
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289 | * RT which needs to decapsulate RT packets */ |
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290 | int (*prepare_packet)(libtrace_t *libtrace, libtrace_packet_t *packet, |
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291 | void *buffer, libtrace_rt_types_t rt_type, |
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292 | uint32_t flags); |
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293 | /** finalise a packet |
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294 | * cleanup any resources used by a packet that can't be reused for |
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295 | * the next packet. |
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296 | */ |
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297 | void (*fin_packet)(libtrace_packet_t *packet); |
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298 | /** write a packet to a trace from the provided packet |
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299 | * (or NULL if output not supported) |
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300 | */ |
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301 | int (*write_packet)(libtrace_out_t *libtrace, libtrace_packet_t *packet); |
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302 | /** return the libtrace link type for this packet |
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303 | * @return the libtrace link type, or -1 if this link type is unknown |
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304 | */ |
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305 | libtrace_linktype_t (*get_link_type)(const libtrace_packet_t *packet); |
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306 | /** return the direction of this packet |
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307 | * @note This callback may be NULL if not supported. |
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308 | */ |
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309 | libtrace_direction_t (*get_direction)(const libtrace_packet_t *packet); |
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310 | /** set the direction of this packet |
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311 | * @note This callback may be NULL if not supported. |
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312 | */ |
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313 | libtrace_direction_t (*set_direction)(libtrace_packet_t *packet, libtrace_direction_t direction); |
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314 | /** return the erf timestamp of the packet. |
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315 | * @return the 64bit erf timestamp |
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316 | * This field may be NULL in the structure, and libtrace will |
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317 | * synthesise the result from get_timeval or get_seconds if they |
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318 | * exist. AT least one of get_erf_timestamp, get_timeval or |
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319 | * get_seconds must be implemented. |
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320 | */ |
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321 | uint64_t (*get_erf_timestamp)(const libtrace_packet_t *packet); |
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322 | /** return the timeval of this packet. |
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323 | * @return the timeval |
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324 | * This field may be NULL in the structure, and libtrace will |
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325 | * synthesise the result from get_erf_timestamp or get_seconds if they |
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326 | * exist. AT least one of get_erf_timestamp, get_timeval or |
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327 | * get_seconds must be implemented. |
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328 | */ |
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329 | struct timeval (*get_timeval)(const libtrace_packet_t *packet); |
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330 | /** return the timestamp of this packet. |
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331 | * @return the floating point seconds since 1970-01-01 00:00:00 |
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332 | * This field may be NULL in the structure, and libtrace will |
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333 | * synthesise the result from get_timeval or get_erf_timestamp if they |
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334 | * exist. AT least one of get_erf_timestamp, get_timeval or |
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335 | * get_seconds must be implemented. |
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336 | */ |
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337 | double (*get_seconds)(const libtrace_packet_t *packet); |
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338 | /** move the pointer within the trace. |
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339 | * @return 0 on success, -1 on failure. |
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340 | * The next packet returned by read_packet be the first |
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341 | * packet in the trace to have a timestamp equal or greater than |
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342 | * timestamp. |
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343 | * @note this function may be NULL if the format does not support |
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344 | * this feature. If the format implements seek_timeval and/or |
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345 | * seek_seconds then libtrace will call those functions instead. |
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346 | */ |
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347 | int (*seek_erf)(libtrace_t *trace, uint64_t timestamp); |
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348 | /** move the pointer within the trace. |
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349 | * @return 0 on success, -1 on failure. |
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350 | * The next packet returned by read_packet be the first |
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351 | * packet in the trace to have a timestamp equal or greater than |
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352 | * timestamp. |
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353 | * @note this function may be NULL if the format does not support |
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354 | * this feature. If the format implements seek_erf and/or |
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355 | * seek_seconds then libtrace will call those functions instead. |
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356 | */ |
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357 | int (*seek_timeval)(libtrace_t *trace, struct timeval tv); |
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358 | /** move the pointer within the trace. |
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359 | * @return 0 on success, -1 on failure. |
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360 | * The next packet returned by read_packet be the first |
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361 | * packet in the trace to have a timestamp equal or greater than |
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362 | * tv. |
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363 | * @note this function may be NULL if the format does not support |
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364 | * this feature. If the format implements seek_erf and/or |
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365 | * seek_timeval then libtrace will call those functions instead. |
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366 | */ |
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367 | int (*seek_seconds)(libtrace_t *trace, double seconds); |
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368 | /** return the captured payload length |
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369 | * @return the amount of data captured in a trace. |
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370 | * This is the number of bytes actually in the trace. This does not |
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371 | * include the trace framing length. This is usually shorter or |
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372 | * equal to the wire length. |
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373 | */ |
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374 | int (*get_capture_length)(const libtrace_packet_t *packet); |
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375 | /** return the original length of the packet on the wire. |
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376 | * @return the length of the packet on the wire before truncation. |
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377 | * This is the number of bytes actually in the trace. This does not |
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378 | * include the trace framing length. This is usually shorter or |
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379 | * equal to the wire length. |
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380 | */ |
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381 | int (*get_wire_length)(const libtrace_packet_t *packet); |
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382 | /** return the length of the trace framing header |
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383 | * @return the length of the framing header |
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384 | * The framing header is the extra metadata a trace stores about |
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385 | * a packet. This does not include the wire or capture length |
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386 | * of the packet. Usually get_framing_length()+get_capture_length() |
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387 | * is the size returned by read_packet |
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388 | */ |
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389 | int (*get_framing_length)(const libtrace_packet_t *packet); |
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390 | /** truncate (snap) the packet |
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391 | * @returns the new size |
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392 | * @note This callback may be NULL if not supported. |
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393 | */ |
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394 | size_t (*set_capture_length)(struct libtrace_packet_t *packet,size_t size); |
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395 | /** Report the number of packets ever seen as early as possible |
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396 | */ |
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397 | uint64_t (*get_received_packets)(libtrace_t *trace); |
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398 | /** Report the number of filtered packets. |
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399 | */ |
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400 | uint64_t (*get_filtered_packets)(libtrace_t *trace); |
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401 | /** Return the number of dropped packets */ |
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402 | uint64_t (*get_dropped_packets)(libtrace_t *trace); |
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403 | /** Report number of captured packets |
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404 | */ |
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405 | uint64_t (*get_captured_packets)(libtrace_t *trace); |
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406 | /** return the filedescriptor associated with this interface. |
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407 | * @note This callback may be NULL if not supported. |
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408 | * This function is only needed if you use trace_event_interface |
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409 | * as the pointer for trace_event |
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410 | */ |
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411 | int (*get_fd)(const libtrace_t *trace); |
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412 | /** return the next event from this source |
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413 | * @note may be NULL if not supported. |
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414 | */ |
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415 | struct libtrace_eventobj_t (*trace_event)(libtrace_t *trace, libtrace_packet_t *packet); |
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416 | /** return information about this trace format to standard out */ |
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417 | void (*help)(void); |
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418 | /** next pointer, should be NULL */ |
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419 | struct libtrace_format_t *next; |
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420 | }; |
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421 | |
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422 | extern struct libtrace_format_t *form; |
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423 | |
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424 | void register_format(struct libtrace_format_t *format); |
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425 | |
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426 | libtrace_linktype_t pcap_linktype_to_libtrace(libtrace_dlt_t linktype); |
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427 | libtrace_rt_types_t pcap_linktype_to_rt(libtrace_dlt_t linktype); |
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428 | libtrace_dlt_t libtrace_to_pcap_linktype(libtrace_linktype_t type); |
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429 | libtrace_dlt_t libtrace_to_pcap_dlt(libtrace_linktype_t type); |
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430 | libtrace_dlt_t rt_to_pcap_linktype(libtrace_rt_types_t rt_type); |
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431 | libtrace_linktype_t erf_type_to_libtrace(uint8_t erf); |
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432 | uint8_t libtrace_to_erf_type(libtrace_linktype_t linktype); |
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433 | libtrace_linktype_t arphrd_type_to_libtrace(unsigned int); |
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434 | unsigned int libtrace_to_arphrd_type(libtrace_linktype_t); |
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435 | |
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436 | void promote_packet(libtrace_packet_t *packet); |
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437 | bool demote_packet(libtrace_packet_t *packet); |
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438 | |
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439 | void *trace_get_payload_from_linux_sll(const void *, uint16_t *, uint32_t *); |
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440 | void *trace_get_payload_from_pos(void *, uint16_t *, uint32_t *); |
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441 | DLLEXPORT void *trace_get_payload_from_atm(void *, uint8_t *, uint32_t *); |
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442 | |
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443 | uint64_t byteswap64(uint64_t num); |
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444 | uint32_t byteswap32(uint32_t num); |
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445 | uint16_t byteswap16(uint16_t num); |
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446 | |
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447 | /* Because some traces/protocols are defined as |
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448 | * being "big endian" or "little endian" we have |
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449 | * this series of macros. |
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450 | */ |
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451 | #if BYTE_ORDER == BIG_ENDIAN |
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452 | #define bswap_host_to_be64(num) ((uint64_t)(num)) |
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453 | #define bswap_host_to_le64(num) byteswap64(num) |
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454 | #define bswap_host_to_be32(num) ((uint32_t)(num)) |
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455 | #define bswap_host_to_le32(num) byteswap32(num) |
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456 | #define bswap_host_to_be16(num) ((uint16_t)(num)) |
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457 | #define bswap_host_to_le16(num) byteswap16(num) |
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458 | |
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459 | #define bswap_be_to_host64(num) ((uint64_t)(num)) |
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460 | #define bswap_le_to_host64(num) byteswap64(num) |
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461 | #define bswap_be_to_host32(num) ((uint32_t)(num)) |
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462 | #define bswap_le_to_host32(num) byteswap32(num) |
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463 | #define bswap_be_to_host16(num) ((uint16_t)(num)) |
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464 | #define bswap_le_to_host16(num) byteswap16(num) |
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465 | |
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466 | /* We use ntoh*() here, because the compiler may |
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467 | * attempt to optimise it |
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468 | */ |
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469 | #elif BYTE_ORDER == LITTLE_ENDIAN |
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470 | #define bswap_host_to_be64(num) (byteswap64(num)) |
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471 | #define bswap_host_to_le64(num) ((uint64_t)(num)) |
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472 | #define bswap_host_to_be32(num) (htonl(num)) |
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473 | #define bswap_host_to_le32(num) ((uint32_t)(num)) |
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474 | #define bswap_host_to_be16(num) (htons(num)) |
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475 | #define bswap_host_to_le16(num) ((uint16_t)(num)) |
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476 | |
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477 | #define bswap_be_to_host64(num) (byteswap64(num)) |
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478 | #define bswap_le_to_host64(num) ((uint64_t)(num)) |
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479 | #define bswap_be_to_host32(num) (ntohl(num)) |
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480 | #define bswap_le_to_host32(num) ((uint32_t)(num)) |
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481 | #define bswap_be_to_host16(num) (ntohs(num)) |
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482 | #define bswap_le_to_host16(num) ((uint16_t)(num)) |
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483 | |
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484 | #else |
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485 | #error "Unknown byte order" |
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486 | #endif |
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487 | |
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488 | #ifdef HAVE_BPF |
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489 | /* A type encapsulating a bpf filter |
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490 | * This type covers the compiled bpf filter, as well as the original filter |
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491 | * string |
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492 | * |
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493 | */ |
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494 | struct libtrace_filter_t { |
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495 | struct bpf_program filter; |
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496 | char * filterstring; |
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497 | int flag; |
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498 | }; |
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499 | #else |
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500 | struct libtrace_filter_t {}; |
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501 | #endif |
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502 | |
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503 | /** libtrace packet |
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504 | */ |
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505 | typedef struct libtrace_pcapfile_pkt_hdr_t { |
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506 | uint32_t ts_sec; |
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507 | uint32_t ts_usec; |
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508 | uint32_t caplen; |
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509 | uint32_t wirelen; |
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510 | } libtrace_pcapfile_pkt_hdr_t; |
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511 | |
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512 | #ifdef HAVE_DAG |
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513 | void dag_constructor(void); |
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514 | #endif |
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515 | void erf_constructor(void); |
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516 | void tsh_constructor(void); |
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517 | void legacy_constructor(void); |
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518 | void linuxnative_constructor(void); |
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519 | void pcap_constructor(void); |
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520 | void pcapfile_constructor(void); |
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521 | void rt_constructor(void); |
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522 | void duck_constructor(void); |
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523 | void atmhdr_constructor(void); |
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524 | #ifdef HAVE_BPF |
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525 | void bpf_constructor(void); |
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526 | #endif |
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527 | |
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528 | /* Used internally by get_wire_length() methods */ |
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529 | bool trace_get_wireless_flags(void *link, libtrace_linktype_t linktype, uint8_t *flags); |
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530 | #define TRACE_RADIOTAP_F_FCS 0x10 |
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531 | |
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532 | #ifdef __cplusplus |
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533 | } |
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534 | #endif |
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535 | |
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536 | #endif /* LIBTRACE_INT_H */ |
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