1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * utils.c
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4 | *
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5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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6 | *
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7 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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8 | *
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9 | * Changes:
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10 | *
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11 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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12 | */
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13 |
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14 | #include "libbb.h"
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15 | #include "utils.h"
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16 | #include "inet_common.h"
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17 |
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18 | int get_integer(int *val, char *arg, int base)
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19 | {
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20 | long res;
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21 | char *ptr;
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22 |
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23 | if (!arg || !*arg)
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24 | return -1;
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25 | res = strtol(arg, &ptr, base);
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26 | if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
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27 | return -1;
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28 | *val = res;
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29 | return 0;
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30 | }
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31 | //XXX: FIXME: use some libbb function instead
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32 | int get_unsigned(unsigned *val, char *arg, int base)
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33 | {
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34 | unsigned long res;
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35 | char *ptr;
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36 |
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37 | if (!arg || !*arg)
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38 | return -1;
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39 | res = strtoul(arg, &ptr, base);
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40 | if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
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41 | return -1;
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42 | *val = res;
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43 | return 0;
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44 | }
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45 |
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46 | int get_u32(uint32_t * val, char *arg, int base)
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47 | {
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48 | unsigned long res;
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49 | char *ptr;
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50 |
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51 | if (!arg || !*arg)
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52 | return -1;
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53 | res = strtoul(arg, &ptr, base);
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54 | if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
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55 | return -1;
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56 | *val = res;
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57 | return 0;
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58 | }
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59 |
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60 | int get_u16(uint16_t * val, char *arg, int base)
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61 | {
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62 | unsigned long res;
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63 | char *ptr;
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64 |
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65 | if (!arg || !*arg)
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66 | return -1;
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67 | res = strtoul(arg, &ptr, base);
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68 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
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69 | return -1;
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70 | *val = res;
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71 | return 0;
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72 | }
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73 |
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74 | int get_u8(uint8_t * val, char *arg, int base)
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75 | {
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76 | unsigned long res;
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77 | char *ptr;
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78 |
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79 | if (!arg || !*arg)
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80 | return -1;
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81 | res = strtoul(arg, &ptr, base);
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82 | if (!ptr || ptr == arg || *ptr || res > 0xFF)
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83 | return -1;
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84 | *val = res;
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85 | return 0;
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86 | }
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87 |
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88 | int get_s16(int16_t * val, char *arg, int base)
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89 | {
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90 | long res;
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91 | char *ptr;
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92 |
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93 | if (!arg || !*arg)
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94 | return -1;
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95 | res = strtol(arg, &ptr, base);
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96 | if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
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97 | return -1;
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98 | *val = res;
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99 | return 0;
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100 | }
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101 |
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102 | int get_s8(int8_t * val, char *arg, int base)
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103 | {
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104 | long res;
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105 | char *ptr;
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106 |
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107 | if (!arg || !*arg)
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108 | return -1;
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109 | res = strtol(arg, &ptr, base);
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110 | if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
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111 | return -1;
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112 | *val = res;
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113 | return 0;
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114 | }
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115 |
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116 | int get_addr_1(inet_prefix * addr, char *name, int family)
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117 | {
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118 | char *cp;
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119 | unsigned char *ap = (unsigned char *) addr->data;
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120 | int i;
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121 |
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122 | memset(addr, 0, sizeof(*addr));
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123 |
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124 | if (strcmp(name, bb_str_default) == 0 ||
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125 | strcmp(name, "all") == 0 || strcmp(name, "any") == 0) {
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126 | addr->family = family;
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127 | addr->bytelen = (family == AF_INET6 ? 16 : 4);
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128 | addr->bitlen = -1;
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129 | return 0;
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130 | }
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131 |
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132 | if (strchr(name, ':')) {
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133 | addr->family = AF_INET6;
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134 | if (family != AF_UNSPEC && family != AF_INET6)
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135 | return -1;
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136 | if (inet_pton(AF_INET6, name, addr->data) <= 0)
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137 | return -1;
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138 | addr->bytelen = 16;
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139 | addr->bitlen = -1;
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140 | return 0;
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141 | }
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142 |
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143 | addr->family = AF_INET;
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144 | if (family != AF_UNSPEC && family != AF_INET)
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145 | return -1;
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146 | addr->bytelen = 4;
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147 | addr->bitlen = -1;
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148 | for (cp = name, i = 0; *cp; cp++) {
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149 | if (*cp <= '9' && *cp >= '0') {
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150 | ap[i] = 10 * ap[i] + (*cp - '0');
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151 | continue;
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152 | }
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153 | if (*cp == '.' && ++i <= 3)
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154 | continue;
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155 | return -1;
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156 | }
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157 | return 0;
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158 | }
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159 |
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160 | int get_prefix_1(inet_prefix * dst, char *arg, int family)
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161 | {
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162 | int err;
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163 | int plen;
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164 | char *slash;
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165 |
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166 | memset(dst, 0, sizeof(*dst));
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167 |
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168 | if (strcmp(arg, bb_str_default) == 0 || strcmp(arg, "any") == 0) {
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169 | dst->family = family;
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170 | dst->bytelen = 0;
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171 | dst->bitlen = 0;
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172 | return 0;
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173 | }
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174 |
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175 | slash = strchr(arg, '/');
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176 | if (slash)
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177 | *slash = '\0';
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178 | err = get_addr_1(dst, arg, family);
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179 | if (err == 0) {
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180 | switch (dst->family) {
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181 | case AF_INET6:
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182 | dst->bitlen = 128;
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183 | break;
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184 | default:
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185 | case AF_INET:
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186 | dst->bitlen = 32;
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187 | }
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188 | if (slash) {
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189 | if (get_integer(&plen, slash + 1, 0) || plen > dst->bitlen) {
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190 | err = -1;
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191 | goto done;
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192 | }
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193 | dst->bitlen = plen;
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194 | }
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195 | }
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196 | done:
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197 | if (slash)
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198 | *slash = '/';
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199 | return err;
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200 | }
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201 |
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202 | int get_addr(inet_prefix * dst, char *arg, int family)
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203 | {
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204 | if (family == AF_PACKET) {
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205 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context", arg);
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206 | }
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207 | if (get_addr_1(dst, arg, family)) {
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208 | bb_error_msg_and_die("an inet address is expected rather than \"%s\"", arg);
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209 | }
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210 | return 0;
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211 | }
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212 |
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213 | int get_prefix(inet_prefix * dst, char *arg, int family)
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214 | {
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215 | if (family == AF_PACKET) {
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216 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context", arg);
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217 | }
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218 | if (get_prefix_1(dst, arg, family)) {
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219 | bb_error_msg_and_die("an inet address is expected rather than \"%s\"", arg);
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220 | }
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221 | return 0;
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222 | }
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223 |
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224 | uint32_t get_addr32(char *name)
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225 | {
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226 | inet_prefix addr;
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227 |
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228 | if (get_addr_1(&addr, name, AF_INET)) {
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229 | bb_error_msg_and_die("an IP address is expected rather than \"%s\"", name);
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230 | }
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231 | return addr.data[0];
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232 | }
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233 |
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234 | void incomplete_command(void)
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235 | {
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236 | bb_error_msg_and_die("command line is not complete, try option \"help\"");
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237 | }
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238 |
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239 | void invarg(const char *arg, const char *opt)
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240 | {
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241 | bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
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242 | }
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243 |
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244 | void duparg(const char *key, const char *arg)
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245 | {
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246 | bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
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247 | }
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248 |
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249 | void duparg2(const char *key, const char *arg)
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250 | {
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251 | bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
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252 | }
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253 |
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254 | int inet_addr_match(inet_prefix * a, inet_prefix * b, int bits)
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255 | {
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256 | uint32_t *a1 = a->data;
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257 | uint32_t *a2 = b->data;
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258 | int words = bits >> 0x05;
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259 |
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260 | bits &= 0x1f;
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261 |
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262 | if (words)
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263 | if (memcmp(a1, a2, words << 2))
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264 | return -1;
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265 |
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266 | if (bits) {
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267 | uint32_t w1, w2;
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268 | uint32_t mask;
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269 |
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270 | w1 = a1[words];
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271 | w2 = a2[words];
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272 |
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273 | mask = htonl((0xffffffff) << (0x20 - bits));
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274 |
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275 | if ((w1 ^ w2) & mask)
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276 | return 1;
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277 | }
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278 |
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279 | return 0;
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280 | }
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281 |
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282 | const char *rt_addr_n2a(int af, int ATTRIBUTE_UNUSED len,
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283 | void *addr, char *buf, int buflen)
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284 | {
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285 | switch (af) {
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286 | case AF_INET:
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287 | case AF_INET6:
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288 | return inet_ntop(af, addr, buf, buflen);
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289 | default:
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290 | return "???";
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291 | }
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292 | }
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293 |
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294 |
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295 | const char *format_host(int af, int len, void *addr, char *buf, int buflen)
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296 | {
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297 | #ifdef RESOLVE_HOSTNAMES
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298 | if (resolve_hosts) {
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299 | struct hostent *h_ent;
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300 |
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301 | if (len <= 0) {
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302 | switch (af) {
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303 | case AF_INET:
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304 | len = 4;
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305 | break;
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306 | case AF_INET6:
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307 | len = 16;
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308 | break;
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309 | default:;
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310 | }
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311 | }
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312 | if (len > 0) {
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313 | h_ent = gethostbyaddr(addr, len, af);
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314 | if (h_ent != NULL) {
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315 | safe_strncpy(buf, h_ent->h_name, buflen);
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316 | return buf;
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317 | }
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318 | }
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319 | }
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320 | #endif
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321 | return rt_addr_n2a(af, len, addr, buf, buflen);
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322 | }
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