1 | /* |
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2 | * Copyright (c) 1996 by Internet Software Consortium. |
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3 | * |
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4 | * Permission to use, copy, modify, and distribute this software for any |
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5 | * purpose with or without fee is hereby granted, provided that the above |
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6 | * copyright notice and this permission notice appear in all copies. |
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7 | * |
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8 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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9 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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10 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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11 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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12 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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13 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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14 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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15 | * SOFTWARE. |
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16 | */ |
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17 | |
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18 | #if defined(LIBC_SCCS) && !defined(lint) |
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19 | static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; |
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20 | #endif |
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21 | #include <sys/cdefs.h> |
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22 | #include <sys/types.h> |
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23 | |
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24 | #include <sys/types.h> |
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25 | #include <sys/socket.h> |
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26 | #include <netinet/in.h> |
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27 | #include <arpa/inet.h> |
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28 | |
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29 | #include <errno.h> |
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30 | #include <stdio.h> |
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31 | #include <string.h> |
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32 | #include <stdlib.h> |
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33 | |
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34 | #ifdef SPRINTF_CHAR |
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35 | # define SPRINTF(x) strlen(sprintf/**/x) |
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36 | #else |
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37 | # define SPRINTF(x) ((size_t)sprintf x) |
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38 | #endif |
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39 | |
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40 | static char * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, |
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41 | size_t size); |
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42 | |
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43 | /* |
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44 | * char * |
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45 | * inet_net_ntop(af, src, bits, dst, size) |
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46 | * convert network number from network to presentation format. |
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47 | * generates CIDR style result always. |
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48 | * return: |
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49 | * pointer to dst, or NULL if an error occurred (check errno). |
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50 | * author: |
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51 | * Paul Vixie (ISC), July 1996 |
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52 | */ |
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53 | char * |
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54 | inet_net_ntop(af, src, bits, dst, size) |
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55 | int af; |
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56 | const void *src; |
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57 | int bits; |
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58 | char *dst; |
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59 | size_t size; |
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60 | { |
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61 | switch (af) { |
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62 | case AF_INET: |
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63 | return (inet_net_ntop_ipv4(src, bits, dst, size)); |
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64 | default: |
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65 | errno = EAFNOSUPPORT; |
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66 | return (NULL); |
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67 | } |
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68 | } |
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69 | |
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70 | /* |
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71 | * static char * |
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72 | * inet_net_ntop_ipv4(src, bits, dst, size) |
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73 | * convert IPv4 network number from network to presentation format. |
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74 | * generates CIDR style result always. |
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75 | * return: |
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76 | * pointer to dst, or NULL if an error occurred (check errno). |
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77 | * note: |
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78 | * network byte order assumed. this means 192.5.5.240/28 has |
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79 | * 0x11110000 in its fourth octet. |
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80 | * author: |
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81 | * Paul Vixie (ISC), July 1996 |
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82 | */ |
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83 | static char * |
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84 | inet_net_ntop_ipv4(src, bits, dst, size) |
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85 | const u_char *src; |
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86 | int bits; |
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87 | char *dst; |
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88 | size_t size; |
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89 | { |
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90 | char *odst = dst; |
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91 | char *t; |
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92 | u_int m; |
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93 | int b; |
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94 | |
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95 | if (bits < 0 || bits > 32) { |
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96 | errno = EINVAL; |
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97 | return (NULL); |
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98 | } |
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99 | if (bits == 0) { |
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100 | if (size < sizeof "0") |
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101 | goto emsgsize; |
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102 | *dst++ = '0'; |
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103 | *dst = '\0'; |
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104 | } |
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105 | |
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106 | /* Format whole octets. */ |
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107 | for (b = bits / 8; b > 0; b--) { |
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108 | if (size < sizeof "255.") |
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109 | goto emsgsize; |
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110 | t = dst; |
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111 | dst += SPRINTF((dst, "%u", *src++)); |
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112 | if (b > 1) { |
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113 | *dst++ = '.'; |
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114 | *dst = '\0'; |
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115 | } |
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116 | size -= (size_t)(dst - t); |
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117 | } |
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118 | |
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119 | /* Format partial octet. */ |
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120 | b = bits % 8; |
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121 | if (b > 0) { |
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122 | if (size < sizeof ".255") |
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123 | goto emsgsize; |
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124 | t = dst; |
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125 | if (dst != odst) |
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126 | *dst++ = '.'; |
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127 | m = ((1 << b) - 1) << (8 - b); |
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128 | dst += SPRINTF((dst, "%u", *src & m)); |
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129 | size -= (size_t)(dst - t); |
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130 | } |
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131 | |
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132 | /* Format CIDR /width. */ |
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133 | if (size < sizeof "/32") |
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134 | goto emsgsize; |
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135 | dst += SPRINTF((dst, "/%u", bits)); |
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136 | return (odst); |
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137 | |
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138 | emsgsize: |
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139 | errno = EMSGSIZE; |
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140 | return (NULL); |
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141 | } |
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142 | |
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143 | /* |
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144 | * Weak aliases for applications that use certain private entry points, |
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145 | * and fail to include <arpa/inet.h>. |
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146 | */ |
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147 | #undef inet_net_ntop |
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148 | __weak_reference(__inet_net_ntop, inet_net_ntop); |
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