1 | /*
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2 | * utils.c
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3 | *
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4 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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5 | *
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6 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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7 | *
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8 | * Changes:
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9 | *
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10 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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11 | */
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12 |
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13 | #include "libbb.h"
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14 |
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15 | #include <string.h>
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16 | #include <unistd.h>
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17 |
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18 | #include "utils.h"
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19 | #include "inet_common.h"
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20 |
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21 | int get_integer(int *val, char *arg, int base)
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22 | {
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23 | long res;
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24 | char *ptr;
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25 |
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26 | if (!arg || !*arg)
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27 | return -1;
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28 | res = strtol(arg, &ptr, base);
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29 | if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
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30 | return -1;
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31 | *val = res;
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32 | return 0;
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33 | }
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34 |
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35 | int get_unsigned(unsigned *val, char *arg, int base)
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36 | {
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37 | unsigned long res;
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38 | char *ptr;
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39 |
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40 | if (!arg || !*arg)
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41 | return -1;
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42 | res = strtoul(arg, &ptr, base);
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43 | if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
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44 | return -1;
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45 | *val = res;
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46 | return 0;
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47 | }
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48 |
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49 | int get_u32(__u32 * val, char *arg, int base)
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50 | {
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51 | unsigned long res;
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52 | char *ptr;
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53 |
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54 | if (!arg || !*arg)
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55 | return -1;
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56 | res = strtoul(arg, &ptr, base);
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57 | if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
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58 | return -1;
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59 | *val = res;
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60 | return 0;
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61 | }
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62 |
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63 | int get_u16(__u16 * val, char *arg, int base)
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64 | {
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65 | unsigned long res;
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66 | char *ptr;
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67 |
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68 | if (!arg || !*arg)
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69 | return -1;
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70 | res = strtoul(arg, &ptr, base);
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71 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
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72 | return -1;
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73 | *val = res;
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74 | return 0;
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75 | }
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76 |
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77 | int get_u8(__u8 * val, char *arg, int base)
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78 | {
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79 | unsigned long res;
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80 | char *ptr;
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81 |
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82 | if (!arg || !*arg)
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83 | return -1;
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84 | res = strtoul(arg, &ptr, base);
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85 | if (!ptr || ptr == arg || *ptr || res > 0xFF)
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86 | return -1;
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87 | *val = res;
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88 | return 0;
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89 | }
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90 |
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91 | int get_s16(__s16 * val, char *arg, int base)
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92 | {
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93 | long res;
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94 | char *ptr;
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95 |
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96 | if (!arg || !*arg)
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97 | return -1;
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98 | res = strtol(arg, &ptr, base);
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99 | if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
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100 | return -1;
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101 | *val = res;
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102 | return 0;
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103 | }
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104 |
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105 | int get_s8(__s8 * val, char *arg, int base)
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106 | {
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107 | long res;
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108 | char *ptr;
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109 |
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110 | if (!arg || !*arg)
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111 | return -1;
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112 | res = strtol(arg, &ptr, base);
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113 | if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
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114 | return -1;
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115 | *val = res;
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116 | return 0;
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117 | }
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118 |
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119 | int get_addr_1(inet_prefix * addr, char *name, int family)
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120 | {
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121 | char *cp;
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122 | unsigned char *ap = (unsigned char *) addr->data;
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123 | int i;
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124 |
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125 | memset(addr, 0, sizeof(*addr));
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126 |
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127 | if (strcmp(name, bb_INET_default) == 0 ||
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128 | strcmp(name, "all") == 0 || strcmp(name, "any") == 0) {
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129 | addr->family = family;
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130 | addr->bytelen = (family == AF_INET6 ? 16 : 4);
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131 | addr->bitlen = -1;
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132 | return 0;
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133 | }
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134 |
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135 | if (strchr(name, ':')) {
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136 | addr->family = AF_INET6;
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137 | if (family != AF_UNSPEC && family != AF_INET6)
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138 | return -1;
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139 | if (inet_pton(AF_INET6, name, addr->data) <= 0)
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140 | return -1;
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141 | addr->bytelen = 16;
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142 | addr->bitlen = -1;
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143 | return 0;
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144 | }
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145 |
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146 | addr->family = AF_INET;
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147 | if (family != AF_UNSPEC && family != AF_INET)
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148 | return -1;
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149 | addr->bytelen = 4;
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150 | addr->bitlen = -1;
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151 | for (cp = name, i = 0; *cp; cp++) {
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152 | if (*cp <= '9' && *cp >= '0') {
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153 | ap[i] = 10 * ap[i] + (*cp - '0');
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154 | continue;
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155 | }
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156 | if (*cp == '.' && ++i <= 3)
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157 | continue;
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158 | return -1;
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159 | }
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160 | return 0;
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161 | }
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162 |
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163 | int get_prefix_1(inet_prefix * dst, char *arg, int family)
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164 | {
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165 | int err;
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166 | int plen;
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167 | char *slash;
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168 |
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169 | memset(dst, 0, sizeof(*dst));
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170 |
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171 | if (strcmp(arg, bb_INET_default) == 0 || strcmp(arg, "any") == 0) {
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172 | dst->family = family;
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173 | dst->bytelen = 0;
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174 | dst->bitlen = 0;
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175 | return 0;
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176 | }
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177 |
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178 | slash = strchr(arg, '/');
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179 | if (slash)
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180 | *slash = 0;
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181 | err = get_addr_1(dst, arg, family);
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182 | if (err == 0) {
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183 | switch (dst->family) {
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184 | case AF_INET6:
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185 | dst->bitlen = 128;
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186 | break;
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187 | default:
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188 | case AF_INET:
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189 | dst->bitlen = 32;
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190 | }
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191 | if (slash) {
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192 | if (get_integer(&plen, slash + 1, 0) || plen > dst->bitlen) {
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193 | err = -1;
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194 | goto done;
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195 | }
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196 | dst->bitlen = plen;
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197 | }
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198 | }
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199 | done:
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200 | if (slash)
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201 | *slash = '/';
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202 | return err;
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203 | }
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204 |
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205 | int get_addr(inet_prefix * dst, char *arg, int family)
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206 | {
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207 | if (family == AF_PACKET) {
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208 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context.", arg);
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209 | }
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210 | if (get_addr_1(dst, arg, family)) {
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211 | bb_error_msg_and_die("an inet address is expected rather than \"%s\".", arg);
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212 | }
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213 | return 0;
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214 | }
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215 |
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216 | int get_prefix(inet_prefix * dst, char *arg, int family)
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217 | {
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218 | if (family == AF_PACKET) {
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219 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context.", arg);
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220 | }
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221 | if (get_prefix_1(dst, arg, family)) {
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222 | bb_error_msg_and_die("an inet address is expected rather than \"%s\".", arg);
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223 | }
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224 | return 0;
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225 | }
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226 |
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227 | __u32 get_addr32(char *name)
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228 | {
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229 | inet_prefix addr;
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230 |
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231 | if (get_addr_1(&addr, name, AF_INET)) {
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232 | bb_error_msg_and_die("an IP address is expected rather than \"%s\"", name);
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233 | }
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234 | return addr.data[0];
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235 | }
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236 |
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237 | void incomplete_command(void)
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238 | {
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239 | bb_error_msg("Command line is not complete. Try option \"help\"");
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240 | exit(-1);
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241 | }
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242 |
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243 | void invarg(const char * const arg, const char * const opt)
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244 | {
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245 | bb_error_msg(bb_msg_invalid_arg, arg, opt);
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246 | exit(-1);
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247 | }
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248 |
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249 | void duparg(char *key, char *arg)
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250 | {
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251 | bb_error_msg("duplicate \"%s\": \"%s\" is the second value.", key, arg);
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252 | exit(-1);
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253 | }
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254 |
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255 | void duparg2(char *key, char *arg)
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256 | {
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257 | bb_error_msg("either \"%s\" is duplicate, or \"%s\" is a garbage.", key, arg);
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258 | exit(-1);
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259 | }
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260 |
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261 | int matches(char *cmd, char *pattern)
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262 | {
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263 | int len = strlen(cmd);
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264 |
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265 | if (len > strlen(pattern)) {
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266 | return -1;
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267 | }
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268 | return memcmp(pattern, cmd, len);
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269 | }
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270 |
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271 | int inet_addr_match(inet_prefix * a, inet_prefix * b, int bits)
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272 | {
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273 | __u32 *a1 = a->data;
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274 | __u32 *a2 = b->data;
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275 | int words = bits >> 0x05;
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276 |
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277 | bits &= 0x1f;
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278 |
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279 | if (words)
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280 | if (memcmp(a1, a2, words << 2))
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281 | return -1;
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282 |
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283 | if (bits) {
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284 | __u32 w1, w2;
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285 | __u32 mask;
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286 |
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287 | w1 = a1[words];
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288 | w2 = a2[words];
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289 |
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290 | mask = htonl((0xffffffff) << (0x20 - bits));
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291 |
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292 | if ((w1 ^ w2) & mask)
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293 | return 1;
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294 | }
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295 |
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296 | return 0;
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297 | }
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298 |
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299 | int __iproute2_hz_internal;
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300 |
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301 | int __get_hz(void)
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302 | {
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303 | int hz = 0;
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304 | FILE *fp = fopen("/proc/net/psched", "r");
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305 |
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306 | if (fp) {
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307 | unsigned nom, denom;
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308 |
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309 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
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310 | if (nom == 1000000)
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311 | hz = denom;
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312 | fclose(fp);
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313 | }
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314 | if (hz)
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315 | return hz;
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316 | return sysconf(_SC_CLK_TCK);
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317 | }
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318 |
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319 | const char *rt_addr_n2a(int af, int ATTRIBUTE_UNUSED len,
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320 | void *addr, char *buf, int buflen)
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321 | {
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322 | switch (af) {
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323 | case AF_INET:
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324 | case AF_INET6:
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325 | return inet_ntop(af, addr, buf, buflen);
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326 | default:
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327 | return "???";
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328 | }
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329 | }
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330 |
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331 |
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332 | const char *format_host(int af, int len, void *addr, char *buf, int buflen)
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333 | {
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334 | #ifdef RESOLVE_HOSTNAMES
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335 | if (resolve_hosts) {
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336 | struct hostent *h_ent;
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337 |
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338 | if (len <= 0) {
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339 | switch (af) {
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340 | case AF_INET:
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341 | len = 4;
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342 | break;
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343 | case AF_INET6:
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344 | len = 16;
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345 | break;
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346 | default:;
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347 | }
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348 | }
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349 | if (len > 0 && (h_ent = gethostbyaddr(addr, len, af)) != NULL) {
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350 | snprintf(buf, buflen - 1, "%s", h_ent->h_name);
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351 | return buf;
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352 | }
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353 | }
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354 | #endif
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355 | return rt_addr_n2a(af, len, addr, buf, buflen);
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356 | }
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