1 | #include <machine/rtems-bsd-user-space.h> |
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2 | |
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3 | /* |
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4 | * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") |
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5 | * Copyright (c) 1996,1999 by Internet Software Consortium. |
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6 | * |
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7 | * Permission to use, copy, modify, and distribute this software for any |
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8 | * purpose with or without fee is hereby granted, provided that the above |
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9 | * copyright notice and this permission notice appear in all copies. |
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10 | * |
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11 | * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES |
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12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR |
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14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
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17 | * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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18 | */ |
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19 | |
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20 | #if defined(LIBC_SCCS) && !defined(lint) |
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21 | static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.5 2006/06/20 02:50:14 marka Exp $"; |
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22 | #endif |
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23 | #include <sys/cdefs.h> |
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24 | __FBSDID("$FreeBSD$"); |
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25 | |
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26 | #include "port_before.h" |
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27 | |
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28 | #include <rtems/bsd/sys/types.h> |
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29 | #include <sys/socket.h> |
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30 | #include <netinet/in.h> |
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31 | #include <arpa/inet.h> |
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32 | |
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33 | #include <errno.h> |
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34 | #include <stdio.h> |
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35 | #include <string.h> |
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36 | #include <stdlib.h> |
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37 | |
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38 | #include "port_after.h" |
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39 | |
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40 | #ifdef SPRINTF_CHAR |
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41 | # define SPRINTF(x) strlen(sprintf/**/x) |
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42 | #else |
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43 | # define SPRINTF(x) ((size_t)sprintf x) |
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44 | #endif |
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45 | |
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46 | static char * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, |
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47 | size_t size); |
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48 | static char * inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, |
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49 | size_t size); |
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50 | |
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51 | /*% |
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52 | * char * |
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53 | * inet_net_ntop(af, src, bits, dst, size) |
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54 | * convert network number from network to presentation format. |
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55 | * generates CIDR style result always. |
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56 | * return: |
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57 | * pointer to dst, or NULL if an error occurred (check errno). |
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58 | * author: |
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59 | * Paul Vixie (ISC), July 1996 |
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60 | */ |
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61 | char * |
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62 | inet_net_ntop(af, src, bits, dst, size) |
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63 | int af; |
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64 | const void *src; |
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65 | int bits; |
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66 | char *dst; |
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67 | size_t size; |
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68 | { |
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69 | switch (af) { |
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70 | case AF_INET: |
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71 | return (inet_net_ntop_ipv4(src, bits, dst, size)); |
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72 | case AF_INET6: |
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73 | return (inet_net_ntop_ipv6(src, bits, dst, size)); |
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74 | default: |
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75 | errno = EAFNOSUPPORT; |
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76 | return (NULL); |
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77 | } |
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78 | } |
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79 | |
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80 | /*% |
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81 | * static char * |
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82 | * inet_net_ntop_ipv4(src, bits, dst, size) |
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83 | * convert IPv4 network number from network to presentation format. |
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84 | * generates CIDR style result always. |
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85 | * return: |
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86 | * pointer to dst, or NULL if an error occurred (check errno). |
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87 | * note: |
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88 | * network byte order assumed. this means 192.5.5.240/28 has |
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89 | * 0b11110000 in its fourth octet. |
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90 | * author: |
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91 | * Paul Vixie (ISC), July 1996 |
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92 | */ |
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93 | static char * |
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94 | inet_net_ntop_ipv4(src, bits, dst, size) |
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95 | const u_char *src; |
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96 | int bits; |
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97 | char *dst; |
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98 | size_t size; |
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99 | { |
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100 | char *odst = dst; |
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101 | char *t; |
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102 | u_int m; |
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103 | int b; |
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104 | |
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105 | if (bits < 0 || bits > 32) { |
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106 | errno = EINVAL; |
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107 | return (NULL); |
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108 | } |
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109 | |
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110 | if (bits == 0) { |
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111 | if (size < sizeof "0") |
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112 | goto emsgsize; |
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113 | *dst++ = '0'; |
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114 | size--; |
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115 | *dst = '\0'; |
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116 | } |
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117 | |
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118 | /* Format whole octets. */ |
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119 | for (b = bits / 8; b > 0; b--) { |
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120 | if (size <= sizeof "255.") |
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121 | goto emsgsize; |
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122 | t = dst; |
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123 | dst += SPRINTF((dst, "%u", *src++)); |
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124 | if (b > 1) { |
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125 | *dst++ = '.'; |
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126 | *dst = '\0'; |
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127 | } |
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128 | size -= (size_t)(dst - t); |
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129 | } |
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130 | |
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131 | /* Format partial octet. */ |
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132 | b = bits % 8; |
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133 | if (b > 0) { |
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134 | if (size <= sizeof ".255") |
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135 | goto emsgsize; |
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136 | t = dst; |
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137 | if (dst != odst) |
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138 | *dst++ = '.'; |
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139 | m = ((1 << b) - 1) << (8 - b); |
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140 | dst += SPRINTF((dst, "%u", *src & m)); |
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141 | size -= (size_t)(dst - t); |
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142 | } |
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143 | |
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144 | /* Format CIDR /width. */ |
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145 | if (size <= sizeof "/32") |
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146 | goto emsgsize; |
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147 | dst += SPRINTF((dst, "/%u", bits)); |
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148 | return (odst); |
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149 | |
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150 | emsgsize: |
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151 | errno = EMSGSIZE; |
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152 | return (NULL); |
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153 | } |
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154 | |
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155 | /*% |
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156 | * static char * |
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157 | * inet_net_ntop_ipv6(src, bits, fakebits, dst, size) |
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158 | * convert IPv6 network number from network to presentation format. |
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159 | * generates CIDR style result always. Picks the shortest representation |
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160 | * unless the IP is really IPv4. |
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161 | * always prints specified number of bits (bits). |
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162 | * return: |
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163 | * pointer to dst, or NULL if an error occurred (check errno). |
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164 | * note: |
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165 | * network byte order assumed. this means 192.5.5.240/28 has |
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166 | * 0b11110000 in its fourth octet. |
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167 | * author: |
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168 | * Vadim Kogan (UCB), June 2001 |
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169 | * Original version (IPv4) by Paul Vixie (ISC), July 1996 |
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170 | */ |
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171 | |
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172 | static char * |
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173 | inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) { |
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174 | u_int m; |
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175 | int b; |
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176 | int p; |
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177 | int zero_s, zero_l, tmp_zero_s, tmp_zero_l; |
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178 | int i; |
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179 | int is_ipv4 = 0; |
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180 | unsigned char inbuf[16]; |
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181 | char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")]; |
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182 | char *cp; |
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183 | int words; |
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184 | u_char *s; |
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185 | |
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186 | if (bits < 0 || bits > 128) { |
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187 | errno = EINVAL; |
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188 | return (NULL); |
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189 | } |
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190 | |
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191 | cp = outbuf; |
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192 | |
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193 | if (bits == 0) { |
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194 | *cp++ = ':'; |
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195 | *cp++ = ':'; |
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196 | *cp = '\0'; |
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197 | } else { |
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198 | /* Copy src to private buffer. Zero host part. */ |
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199 | p = (bits + 7) / 8; |
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200 | memcpy(inbuf, src, p); |
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201 | memset(inbuf + p, 0, 16 - p); |
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202 | b = bits % 8; |
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203 | if (b != 0) { |
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204 | m = ~0 << (8 - b); |
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205 | inbuf[p-1] &= m; |
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206 | } |
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207 | |
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208 | s = inbuf; |
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209 | |
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210 | /* how many words need to be displayed in output */ |
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211 | words = (bits + 15) / 16; |
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212 | if (words == 1) |
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213 | words = 2; |
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214 | |
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215 | /* Find the longest substring of zero's */ |
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216 | zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0; |
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217 | for (i = 0; i < (words * 2); i += 2) { |
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218 | if ((s[i] | s[i+1]) == 0) { |
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219 | if (tmp_zero_l == 0) |
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220 | tmp_zero_s = i / 2; |
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221 | tmp_zero_l++; |
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222 | } else { |
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223 | if (tmp_zero_l && zero_l < tmp_zero_l) { |
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224 | zero_s = tmp_zero_s; |
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225 | zero_l = tmp_zero_l; |
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226 | tmp_zero_l = 0; |
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227 | } |
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228 | } |
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229 | } |
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230 | |
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231 | if (tmp_zero_l && zero_l < tmp_zero_l) { |
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232 | zero_s = tmp_zero_s; |
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233 | zero_l = tmp_zero_l; |
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234 | } |
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235 | |
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236 | if (zero_l != words && zero_s == 0 && ((zero_l == 6) || |
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237 | ((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) || |
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238 | ((zero_l == 7 && s[14] != 0 && s[15] != 1))))) |
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239 | is_ipv4 = 1; |
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240 | |
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241 | /* Format whole words. */ |
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242 | for (p = 0; p < words; p++) { |
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243 | if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l) { |
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244 | /* Time to skip some zeros */ |
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245 | if (p == zero_s) |
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246 | *cp++ = ':'; |
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247 | if (p == words - 1) |
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248 | *cp++ = ':'; |
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249 | s++; |
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250 | s++; |
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251 | continue; |
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252 | } |
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253 | |
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254 | if (is_ipv4 && p > 5 ) { |
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255 | *cp++ = (p == 6) ? ':' : '.'; |
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256 | cp += SPRINTF((cp, "%u", *s++)); |
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257 | /* we can potentially drop the last octet */ |
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258 | if (p != 7 || bits > 120) { |
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259 | *cp++ = '.'; |
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260 | cp += SPRINTF((cp, "%u", *s++)); |
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261 | } |
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262 | } else { |
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263 | if (cp != outbuf) |
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264 | *cp++ = ':'; |
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265 | cp += SPRINTF((cp, "%x", *s * 256 + s[1])); |
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266 | s += 2; |
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267 | } |
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268 | } |
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269 | } |
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270 | /* Format CIDR /width. */ |
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271 | sprintf(cp, "/%u", bits); |
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272 | if (strlen(outbuf) + 1 > size) |
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273 | goto emsgsize; |
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274 | strcpy(dst, outbuf); |
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275 | |
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276 | return (dst); |
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277 | |
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278 | emsgsize: |
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279 | errno = EMSGSIZE; |
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280 | return (NULL); |
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281 | } |
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282 | |
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283 | /* |
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284 | * Weak aliases for applications that use certain private entry points, |
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285 | * and fail to include <arpa/inet.h>. |
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286 | */ |
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287 | #undef inet_net_ntop |
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288 | __weak_reference(__inet_net_ntop, inet_net_ntop); |
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289 | |
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290 | /*! \file */ |
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