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 | #define _GNU_SOURCE |
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27 | |
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28 | #include "config.h" |
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29 | #include "common.h" |
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30 | #include "libtrace.h" |
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31 | #include "libtrace_int.h" |
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32 | #include "format_helper.h" |
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33 | #include "format_erf.h" |
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34 | |
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35 | #include <assert.h> |
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36 | #include <errno.h> |
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37 | #include <fcntl.h> |
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38 | #include <stdio.h> |
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39 | #include <string.h> |
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40 | #include <stdlib.h> |
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41 | #include <sys/stat.h> |
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42 | |
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43 | #include <sys/mman.h> |
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44 | #ifdef WIN32 |
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45 | # include <io.h> |
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46 | # include <share.h> |
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47 | # define PATH_MAX _MAX_PATH |
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48 | # define snprintf sprintf_s |
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49 | #else |
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50 | # include <netdb.h> |
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51 | # ifndef PATH_MAX |
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52 | # define PATH_MAX 4096 |
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53 | # endif |
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54 | # include <sys/ioctl.h> |
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55 | #endif |
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56 | |
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57 | /* This format deals with DAG cards that are using drivers from the 2.4.X |
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58 | * versions. |
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59 | * |
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60 | * DAG is a LIVE capture format. |
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61 | * |
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62 | * We do not support writing using this format, as transmit support was not |
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63 | * added until a subsequent version of the DAG software (see format_dag25.c). |
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64 | * Instead, you should write the packets read using this format as ERF traces. |
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65 | */ |
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66 | |
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67 | static struct libtrace_format_t dag; |
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68 | |
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69 | #define DATA(x) ((struct dag_format_data_t *)x->format_data) |
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70 | #define DUCK DATA(libtrace)->duck |
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71 | #define FORMAT_DATA DATA(libtrace) |
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72 | |
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73 | /* "Global" data that is stored for each DAG input trace */ |
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74 | struct dag_format_data_t { |
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75 | |
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76 | /* Data required for regular DUCK reporting */ |
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77 | struct { |
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78 | /* Timestamp of the last DUCK report */ |
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79 | uint32_t last_duck; |
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80 | /* The number of seconds between each DUCK report */ |
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81 | uint32_t duck_freq; |
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82 | /* Timestamp of the last packet read from the DAG card */ |
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83 | uint32_t last_pkt; |
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84 | /* Dummy trace to ensure DUCK packets are dealt with using |
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85 | * the DUCK format functions */ |
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86 | libtrace_t *dummy_duck; |
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87 | } duck; |
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88 | |
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89 | /* File descriptor for the DAG card */ |
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90 | int fd; |
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91 | /* Pointer to DAG memory hole */ |
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92 | void *buf; |
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93 | /* Difference between the top and bottom pointers in the DAG memory |
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94 | * hole, i.e. the amount of available data to read */ |
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95 | uint32_t diff; |
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96 | /* The amount of data read thus far from the start of the bottom |
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97 | * pointer */ |
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98 | uint32_t offset; |
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99 | /* The offset for the first unread byte in the DAG memory hole */ |
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100 | uint32_t bottom; |
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101 | /* The offset for the last unread byte in the DAG memory hole */ |
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102 | uint32_t top; |
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103 | /* The number of packets that have been dropped */ |
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104 | uint64_t drops; |
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105 | }; |
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106 | |
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107 | /* Determines if a given filename refers to a DAG device */ |
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108 | static void dag_probe_filename(const char *filename) |
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109 | { |
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110 | struct stat statbuf; |
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111 | /* Can we stat the file? */ |
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112 | if (stat(filename, &statbuf) != 0) { |
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113 | return 0; |
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114 | } |
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115 | /* Is it a character device? */ |
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116 | if (!S_ISCHR(statbuf.st_mode)) { |
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117 | return 0; |
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118 | } |
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119 | /* Yeah, it's probably us. */ |
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120 | return 1; |
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121 | } |
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122 | |
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123 | /* Initialises the DAG "global" variables */ |
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124 | static void dag_init_format_data(libtrace_t *libtrace) { |
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125 | libtrace->format_data = (struct dag_format_data_t *) |
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126 | malloc(sizeof(struct dag_format_data_t)); |
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127 | |
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128 | DUCK.last_duck = 0; |
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129 | DUCK.duck_freq = 0; |
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130 | DUCK.last_pkt = 0; |
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131 | DUCK.dummy_duck = NULL; |
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132 | FORMAT_DATA->drops = 0; |
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133 | FORMAT_DATA->top = 0; |
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134 | FORMAT_DATA->bottom = 0; |
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135 | FORMAT_DATA->buf = NULL; |
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136 | FORMAT_DATA->fd = -1; |
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137 | FORMAT_DATA->offset = 0; |
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138 | FORMAT_DATA->diff = 0; |
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139 | } |
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140 | |
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141 | /* Determines how much data is available for reading on the DAG card and |
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142 | * updates the various offsets accordingly */ |
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143 | static int dag_available(libtrace_t *libtrace) { |
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144 | |
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145 | if (FORMAT_DATA->diff > 0) |
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146 | return FORMAT_DATA->diff; |
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147 | |
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148 | FORMAT_DATA->bottom = FORMAT_DATA->top; |
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149 | FORMAT_DATA->top = dag_offset( |
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150 | FORMAT_DATA->fd, |
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151 | &(FORMAT_DATA->bottom), |
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152 | DAGF_NONBLOCK); |
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153 | FORMAT_DATA->diff = FORMAT_DATA->top - FORMAT_DATA->bottom; |
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154 | FORMAT_DATA->offset = 0; |
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155 | return FORMAT_DATA->diff; |
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156 | } |
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157 | |
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158 | /* Initialises a DAG input trace */ |
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159 | static int dag_init_input(libtrace_t *libtrace) { |
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160 | struct stat buf; |
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161 | char *dag_dev_name = NULL; |
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162 | char *scan = NULL; |
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163 | |
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164 | /* Since DAG 2.5 has been changed to support a slightly different URI |
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165 | * format, it's probably a good idea to deal with URIs specified in |
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166 | * such a fashion even if we just end up ignoring the stream number */ |
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167 | if ((scan = strchr(libtrace->uridata,',')) == NULL) { |
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168 | dag_dev_name = strdup(libtrace->uridata); |
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169 | } else { |
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170 | dag_dev_name = (char *)strndup(libtrace->uridata, |
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171 | (size_t)(scan - libtrace->uridata)); |
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172 | } |
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173 | |
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174 | |
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175 | /* Make sure a DAG device with the right name exists */ |
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176 | if (stat(dag_dev_name, &buf) == -1) { |
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177 | trace_set_err(libtrace,errno,"stat(%s)",dag_dev_name); |
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178 | free(dag_dev_name); |
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179 | return -1; |
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180 | } |
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181 | |
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182 | dag_init_format_data(libtrace); |
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183 | if (S_ISCHR(buf.st_mode)) { |
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184 | /* DEVICE */ |
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185 | if((FORMAT_DATA->fd = dag_open(dag_dev_name)) < 0) { |
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186 | trace_set_err(libtrace,errno,"Cannot open DAG %s", |
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187 | dag_dev_name); |
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188 | free(dag_dev_name); |
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189 | return -1; |
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190 | } |
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191 | |
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192 | /* Memory-map ourselves a pointer to the DAG memory hole */ |
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193 | if((FORMAT_DATA->buf = (void *)dag_mmap(FORMAT_DATA->fd)) == MAP_FAILED) { |
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194 | trace_set_err(libtrace,errno,"Cannot mmap DAG %s", |
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195 | dag_dev_name); |
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196 | free(dag_dev_name); |
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197 | return -1; |
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198 | } |
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199 | } else { |
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200 | trace_set_err(libtrace,errno,"Not a valid dag device: %s", |
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201 | dag_dev_name); |
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202 | free(dag_dev_name); |
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203 | return -1; |
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204 | } |
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205 | |
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206 | free(dag_dev_name); |
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207 | |
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208 | return 0; |
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209 | } |
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210 | |
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211 | /* Configures a DAG input trace */ |
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212 | static int dag_config_input(libtrace_t *libtrace, trace_option_t option, |
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213 | void *data) { |
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214 | switch(option) { |
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215 | case TRACE_OPTION_META_FREQ: |
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216 | /* We use this option to specify the frequency of |
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217 | * DUCK updates */ |
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218 | DUCK.duck_freq = *(int *)data; |
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219 | return 0; |
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220 | case TRACE_OPTION_SNAPLEN: |
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221 | /* Surely we can set this?? Fall through for now*/ |
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222 | return -1; |
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223 | case TRACE_OPTION_PROMISC: |
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224 | /* DAG already operates in a promisc fashion */ |
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225 | return -1; |
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226 | case TRACE_OPTION_FILTER: |
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227 | /* Cards that use the older drivers don't do |
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228 | * filtering */ |
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229 | return -1; |
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230 | case TRACE_OPTION_EVENT_REALTIME: |
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231 | /* Live capture is always going to be realtime */ |
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232 | return -1; |
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233 | } |
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234 | return -1; |
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235 | } |
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236 | |
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237 | /* Starts a DAG input trace */ |
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238 | static int dag_start_input(libtrace_t *libtrace) { |
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239 | if(dag_start(FORMAT_DATA->fd) < 0) { |
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240 | trace_set_err(libtrace,errno,"Cannot start DAG %s", |
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241 | libtrace->uridata); |
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242 | return -1; |
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243 | } |
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244 | |
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245 | /* Flush the memory hole */ |
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246 | while(dag_available(libtrace) != 0) |
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247 | FORMAT_DATA->diff = 0; |
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248 | FORMAT_DATA->drops = 0; |
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249 | return 0; |
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250 | } |
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251 | |
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252 | /* Pauses a DAG input trace */ |
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253 | static int dag_pause_input(libtrace_t *libtrace) { |
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254 | dag_stop(FORMAT_DATA->fd); |
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255 | return 0; |
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256 | } |
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257 | |
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258 | /* Destroys a DAG input trace */ |
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259 | static int dag_fin_input(libtrace_t *libtrace) { |
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260 | dag_close(FORMAT_DATA->fd); |
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261 | if (DUCK.dummy_duck) |
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262 | trace_destroy_dead(DUCK.dummy_duck); |
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263 | free(libtrace->format_data); |
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264 | return 0; /* success */ |
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265 | } |
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266 | |
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267 | /* Extracts DUCK information from the DAG card and produces a DUCK packet */ |
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268 | static int dag_get_duckinfo(libtrace_t *libtrace, |
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269 | libtrace_packet_t *packet) { |
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270 | dag_inf lt_dag_inf; |
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271 | |
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272 | /* Allocate memory for the DUCK data */ |
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273 | if (packet->buf_control == TRACE_CTRL_EXTERNAL || |
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274 | !packet->buffer) { |
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275 | packet->buffer = malloc(LIBTRACE_PACKET_BUFSIZE); |
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276 | packet->buf_control = TRACE_CTRL_PACKET; |
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277 | if (!packet->buffer) { |
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278 | trace_set_err(libtrace, errno, |
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279 | "Cannot allocate packet buffer"); |
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280 | return -1; |
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281 | } |
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282 | } |
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283 | |
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284 | /* DUCK doesn't actually have a format header, as such */ |
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285 | packet->header = 0; |
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286 | packet->payload = packet->buffer; |
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287 | |
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288 | /* Check that the DAG card supports DUCK */ |
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289 | if ((ioctl(FORMAT_DATA->fd, DAG_IOINF, <_dag_inf) < 0)) { |
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290 | trace_set_err(libtrace, errno, |
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291 | "Error using DAG_IOINF"); |
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292 | return -1; |
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293 | } |
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294 | if (!IsDUCK(<_dag_inf)) { |
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295 | printf("WARNING: %s does not have modern clock support - No DUCK information will be gathered\n", libtrace->uridata); |
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296 | return 0; |
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297 | } |
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298 | |
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299 | /* Get the DUCK information from the card */ |
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300 | if ((ioctl(FORMAT_DATA->fd, DAG_IOGETDUCK, (duck_inf *)packet->payload) |
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301 | < 0)) { |
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302 | trace_set_err(libtrace, errno, "Error using DAG_IOGETDUCK"); |
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303 | return -1; |
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304 | } |
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305 | |
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306 | /* Set the type */ |
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307 | packet->type = TRACE_RT_DUCK_2_4; |
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308 | |
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309 | /* Set the packet's trace to point at a DUCK trace, so that the |
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310 | * DUCK format functions will be called on the packet rather than the |
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311 | * DAG ones */ |
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312 | if (!DUCK.dummy_duck) |
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313 | DUCK.dummy_duck = trace_create_dead("duck:dummy"); |
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314 | packet->trace = DUCK.dummy_duck; |
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315 | return sizeof(duck_inf); |
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316 | } |
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317 | |
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318 | /* Reads the next ERF record from the DAG memory hole */ |
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319 | static dag_record_t *dag_get_record(libtrace_t *libtrace) { |
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320 | dag_record_t *erfptr = NULL; |
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321 | uint16_t size; |
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322 | erfptr = (dag_record_t *) ((char *)FORMAT_DATA->buf + |
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323 | (FORMAT_DATA->bottom + FORMAT_DATA->offset)); |
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324 | |
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325 | if (!erfptr) |
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326 | return NULL; |
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327 | size = ntohs(erfptr->rlen); |
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328 | assert( size >= dag_record_size ); |
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329 | FORMAT_DATA->offset += size; |
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330 | FORMAT_DATA->diff -= size; |
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331 | return erfptr; |
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332 | } |
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333 | |
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334 | /* Converts a buffer containing a recently read DAG packet record into a |
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335 | * libtrace packet */ |
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336 | static int dag_prepare_packet(libtrace_t *libtrace, libtrace_packet_t *packet, |
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337 | void *buffer, libtrace_rt_types_t rt_type, uint32_t flags) { |
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338 | |
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339 | dag_record_t *erfptr; |
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340 | /* If the packet previously owned a buffer that is not the buffer |
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341 | * that contains the new packet data, we're going to need to free the |
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342 | * old one to avoid memory leaks */ |
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343 | if (packet->buffer != buffer && |
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344 | packet->buf_control == TRACE_CTRL_PACKET) { |
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345 | free(packet->buffer); |
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346 | } |
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347 | |
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348 | /* Set the buffer owner appropriately */ |
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349 | if ((flags & TRACE_PREP_OWN_BUFFER) == TRACE_PREP_OWN_BUFFER) { |
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350 | packet->buf_control = TRACE_CTRL_PACKET; |
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351 | } else |
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352 | packet->buf_control = TRACE_CTRL_EXTERNAL; |
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353 | |
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354 | /* Update packet pointers and type appropriately */ |
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355 | erfptr = (dag_record_t *)buffer; |
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356 | packet->buffer = erfptr; |
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357 | packet->header = erfptr; |
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358 | packet->type = rt_type; |
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359 | |
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360 | if (erfptr->flags.rxerror == 1) { |
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361 | /* rxerror means the payload is corrupt - drop the payload |
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362 | * by tweaking rlen */ |
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363 | packet->payload = NULL; |
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364 | erfptr->rlen = htons(erf_get_framing_length(packet)); |
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365 | } else { |
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366 | packet->payload = (char*)packet->buffer |
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367 | + erf_get_framing_length(packet); |
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368 | } |
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369 | |
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370 | if (libtrace->format_data == NULL) { |
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371 | dag_init_format_data(libtrace); |
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372 | } |
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373 | |
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374 | /* Update the dropped packets counter, using the value of the ERF |
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375 | * loss counter */ |
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376 | DATA(libtrace)->drops += ntohs(erfptr->lctr); |
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377 | |
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378 | return 0; |
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379 | |
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380 | } |
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381 | |
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382 | /* Reads the next available packet from a DAG card, in a BLOCKING fashion |
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383 | * |
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384 | * If DUCK reporting is enabled, the packet returned may be a DUCK update */ |
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385 | static int dag_read_packet(libtrace_t *libtrace, libtrace_packet_t *packet) { |
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386 | int numbytes; |
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387 | int size = 0; |
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388 | uint32_t flags = 0; |
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389 | struct timeval tv; |
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390 | dag_record_t *erfptr = NULL; |
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391 | |
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392 | /* Check if we're due for a DUCK report */ |
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393 | if (DUCK.last_pkt - DUCK.last_duck > DUCK.duck_freq && |
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394 | DUCK.duck_freq != 0) { |
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395 | size = dag_get_duckinfo(libtrace, packet); |
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396 | DUCK.last_duck = DUCK.last_pkt; |
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397 | if (size != 0) { |
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398 | return size; |
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399 | } |
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400 | /* No DUCK support, so don't waste our time anymore */ |
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401 | DUCK.duck_freq = 0; |
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402 | } |
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403 | |
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404 | /* Don't let anyone try to free our DAG memory hole */ |
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405 | flags |= TRACE_PREP_DO_NOT_OWN_BUFFER; |
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406 | |
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407 | /* If the packet buffer is currently owned by libtrace, free it so |
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408 | * that we can set the packet to point into the DAG memory hole */ |
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409 | if (packet->buf_control == TRACE_CTRL_PACKET) { |
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410 | packet->buf_control = TRACE_CTRL_EXTERNAL; |
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411 | free(packet->buffer); |
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412 | packet->buffer = 0; |
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413 | } |
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414 | |
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415 | /* Grab a full ERF record */ |
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416 | do { |
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417 | numbytes = dag_available(libtrace); |
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418 | if (numbytes < 0) |
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419 | return numbytes; |
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420 | if (numbytes == 0) |
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421 | continue; |
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422 | erfptr = dag_get_record(libtrace); |
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423 | } while (erfptr == NULL); |
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424 | |
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425 | /* Prepare the libtrace packet */ |
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426 | if (dag_prepare_packet(libtrace, packet, erfptr, TRACE_RT_DATA_ERF, |
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427 | flags)) |
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428 | return -1; |
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429 | |
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430 | /* Update the DUCK timer */ |
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431 | tv = trace_get_timeval(packet); |
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432 | DUCK.last_pkt = tv.tv_sec; |
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433 | return packet->payload ? htons(erfptr->rlen) : erf_get_framing_length(packet); |
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434 | } |
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435 | |
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436 | /* Attempts to read a packet from a DAG card in a NON-BLOCKING fashion. If |
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437 | * a packet is available, we will return a packet event. Otherwise we will |
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438 | * return a SLEEP event (as we cannot select on the DAG file descriptor). |
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439 | */ |
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440 | static libtrace_eventobj_t trace_event_dag(libtrace_t *trace, |
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441 | libtrace_packet_t *packet) { |
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442 | libtrace_eventobj_t event = {0,0,0.0,0}; |
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443 | int data; |
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444 | |
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445 | do { |
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446 | data = dag_available(trace); |
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447 | |
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448 | /* If no data is available, drop out and return a sleep event */ |
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449 | if (data <= 0) |
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450 | break; |
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451 | |
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452 | /* Data is available, so we can call the blocking read because |
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453 | * we know that we will get a packet straight away */ |
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454 | event.size = dag_read_packet(trace,packet); |
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455 | //DATA(trace)->dag.diff -= event.size; |
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456 | |
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457 | /* XXX trace_read_packet() normally applies the following |
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458 | * config options for us, but this function is called via |
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459 | * trace_event() so we have to do it ourselves */ |
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460 | |
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461 | /* Check that the packet matches any pre-existing filter */ |
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462 | if (trace->filter) { |
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463 | if (trace_apply_filter(trace->filter, packet)) { |
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464 | event.type = TRACE_EVENT_PACKET; |
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465 | } else { |
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466 | /* Do not sleep - try to read another packet */ |
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467 | trace->filtered_packets ++; |
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468 | continue; |
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469 | } |
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470 | } else { |
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471 | event.type = TRACE_EVENT_PACKET; |
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472 | } |
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473 | |
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474 | /* If the user has specified a snap length, apply that too */ |
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475 | if (trace->snaplen > 0) { |
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476 | trace_set_capture_length(packet, trace->snaplen); |
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477 | } |
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478 | trace->accepted_packets ++; |
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479 | return event; |
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480 | } while (1); |
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481 | |
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482 | |
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483 | /* We only want to sleep for a very short time */ |
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484 | assert(data == 0); |
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485 | event.type = TRACE_EVENT_SLEEP; |
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486 | event.seconds = 0.0001; |
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487 | event.size = 0; |
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488 | return event; |
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489 | } |
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490 | |
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491 | /* Gets the number of dropped packets */ |
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492 | static uint64_t dag_get_dropped_packets(libtrace_t *trace) |
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493 | { |
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494 | if (!trace->format_data) |
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495 | return (uint64_t)-1; |
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496 | return DATA(trace)->drops; |
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497 | } |
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498 | |
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499 | /* Prints some semi-useful help text about the DAG format module */ |
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500 | static void dag_help(void) { |
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501 | printf("dag format module: $Revision: 1715 $\n"); |
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502 | printf("Supported input URIs:\n"); |
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503 | printf("\tdag:/dev/dagn\n"); |
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504 | printf("\n"); |
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505 | printf("\te.g.: dag:/dev/dag0\n"); |
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506 | printf("\n"); |
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507 | printf("Supported output URIs:\n"); |
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508 | printf("\tnone\n"); |
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509 | printf("\n"); |
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510 | } |
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511 | |
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512 | static struct libtrace_format_t dag = { |
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513 | "dag", |
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514 | "$Id$", |
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515 | TRACE_FORMAT_ERF, |
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516 | dag_probe_filename, /* probe filename */ |
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517 | NULL, /* probe magic */ |
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518 | dag_init_input, /* init_input */ |
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519 | dag_config_input, /* config_input */ |
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520 | dag_start_input, /* start_input */ |
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521 | dag_pause_input, /* pause_input */ |
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522 | NULL, /* init_output */ |
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523 | NULL, /* config_output */ |
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524 | NULL, /* start_output */ |
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525 | dag_fin_input, /* fin_input */ |
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526 | NULL, /* fin_output */ |
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527 | dag_read_packet, /* read_packet */ |
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528 | dag_prepare_packet, /* prepare_packet */ |
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529 | NULL, /* fin_packet */ |
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530 | NULL, /* write_packet */ |
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531 | NULL, /* flush_output */ |
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532 | erf_get_link_type, /* get_link_type */ |
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533 | erf_get_direction, /* get_direction */ |
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534 | erf_set_direction, /* set_direction */ |
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535 | erf_get_erf_timestamp, /* get_erf_timestamp */ |
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536 | NULL, /* get_timeval */ |
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537 | NULL, /* get_timespec */ |
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538 | NULL, /* get_seconds */ |
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539 | NULL, /* seek_erf */ |
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540 | NULL, /* seek_timeval */ |
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541 | NULL, /* seek_seconds */ |
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542 | erf_get_capture_length, /* get_capture_length */ |
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543 | erf_get_wire_length, /* get_wire_length */ |
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544 | erf_get_framing_length, /* get_framing_length */ |
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545 | erf_set_capture_length, /* set_capture_length */ |
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546 | NULL, /* get_received_packets */ |
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547 | NULL, /* get_filtered_packets */ |
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548 | dag_get_dropped_packets, /* get_dropped_packets */ |
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549 | NULL, /* get_statistics */ |
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550 | NULL, /* get_fd */ |
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551 | trace_event_dag, /* trace_event */ |
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552 | dag_help, /* help */ |
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553 | NULL, /* next pointer */ |
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554 | NON_PARALLEL(true) |
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555 | }; |
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556 | |
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557 | void dag_constructor(void) { |
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558 | register_format(&dag); |
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559 | } |
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