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annotate packages/net/common/current/src/inet_ntop.c @ 3104:bc2f148cfe4b

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Fixed compiler warnings about variables possibly used before they are initialized. [ Bugzilla 1001509 ]
author grante
date Tue, 06 Mar 2012 19:18:09 +0000
parents 74dbf4c3f2e1
children
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1 //==========================================================================
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2 //
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3 // src/inet_ntop.c
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4 //
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5 //==========================================================================
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6 // ####BSDCOPYRIGHTBEGIN####
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7 // -------------------------------------------
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8 // This file is part of eCos, the Embedded Configurable Operating System.
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9 //
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10 // Portions of this software may have been derived from FreeBSD, OpenBSD,
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11 // or other sources, and if so are covered by the appropriate copyright
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12 // and license included herein.
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13 //
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14 // Portions created by the Free Software Foundation are
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15 // Copyright (C) 2002 Free Software Foundation, Inc.
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16 // -------------------------------------------
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17 // ####BSDCOPYRIGHTEND####
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18 //==========================================================================
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19
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20 /* $OpenBSD: inet_ntop.c,v 1.1 1997/03/13 19:07:32 downsj Exp $ */
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21
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22 /* Copyright (c) 1996 by Internet Software Consortium.
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23 *
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24 * Permission to use, copy, modify, and distribute this software for any
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25 * purpose with or without fee is hereby granted, provided that the above
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26 * copyright notice and this permission notice appear in all copies.
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27 *
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28 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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29 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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30 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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31 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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32 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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33 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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34 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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35 * SOFTWARE.
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36 */
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37
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38 #include <sys/param.h>
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39 #include <sys/types.h>
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40 #include <sys/socket.h>
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41 #include <netinet/in.h>
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42 #include <arpa/inet.h>
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43 #include <arpa/nameser.h>
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44 #include <string.h>
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45 #include <errno.h>
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46 #ifndef CYGPKG_NET_FREEBSD_STACK
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47 #include <stdio.h>
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48 #endif
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49
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50 #ifndef IN6ADDRSZ
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51 #define IN6ADDRSZ 16 /* IPv6 T_AAAA */
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52 #endif
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53 #ifndef INT16SZ
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54 #define INT16SZ sizeof(u_int16_t)
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55 #endif
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56
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57 /*
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58 * WARNING: Don't even consider trying to compile this on a system where
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59 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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60 */
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61
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62 static const char *inet_ntop4 __P((const u_char *src, char *dst, size_t size));
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63 #ifdef CYGPKG_NET_INET6
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64 static const char *inet_ntop6 __P((const u_char *src, char *dst, size_t size));
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65 #endif
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66
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67 /* char *
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68 * inet_ntop(af, src, dst, size)
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69 * convert a network format address to presentation format.
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70 * return:
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71 * pointer to presentation format address (`dst'), or NULL (see errno).
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72 * author:
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73 * Paul Vixie, 1996.
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74 */
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75 const char *
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76 inet_ntop(int af, const void *src, char *dst, size_t size)
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77 {
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78 switch (af) {
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79 case AF_INET:
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80 return (inet_ntop4(src, dst, size));
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81 #ifdef CYGPKG_NET_INET6
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82 case AF_INET6:
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83 return (inet_ntop6(src, dst, size));
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84 #endif
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85 default:
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86 errno = EAFNOSUPPORT;
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87 return (NULL);
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88 }
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89 /* NOTREACHED */
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90 }
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91
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92 //
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93 // A more useful conversion routine
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94 // Convert a network [socket] address to presentation format
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95 // This routine handles all of the mapping required and isolates
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96 // the knowledge of the structure format.
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97 //
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98 const char *
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99 _inet_ntop(struct sockaddr *sa, char *dst, size_t size)
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100 {
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101 switch (sa->sa_family) {
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102 case AF_INET:
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103 return (inet_ntop(AF_INET, (char *)&((struct sockaddr_in *)sa)->sin_addr,
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104 dst, size));
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105 #ifdef CYGPKG_NET_INET6
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106 case AF_INET6:
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107 return (inet_ntop(AF_INET6, (char *)&((struct sockaddr_in6 *)sa)->sin6_addr,
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108 dst, size));
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109 #endif
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110 default:
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111 errno = EAFNOSUPPORT;
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112 return (NULL);
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113 }
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114 }
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115
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116 u_int16_t
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117 _inet_port(struct sockaddr *sa)
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118 {
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119 switch (sa->sa_family) {
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120 case AF_INET:
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121 return (ntohs(((struct sockaddr_in *)sa)->sin_port));
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122 #ifdef CYGPKG_NET_INET6
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123 case AF_INET6:
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124 return (ntohs(((struct sockaddr_in6 *)sa)->sin6_port));
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125 #endif
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126 default:
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127 return 0; // Unknown!
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128 }
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129 }
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130
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131 /* const char *
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132 * inet_ntop4(src, dst, size)
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133 * format an IPv4 address, more or less like inet_ntoa()
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134 * return:
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135 * `dst' (as a const)
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136 * notes:
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137 * (1) uses no statics
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138 * (2) takes a u_char* not an in_addr as input
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139 * author:
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140 * Paul Vixie, 1996.
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141 */
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142 static const char *
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143 inet_ntop4(src, dst, size)
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144 const u_char *src;
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145 char *dst;
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146 size_t size;
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147 {
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148 static const char fmt[] = "%u.%u.%u.%u";
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149 char tmp[sizeof "255.255.255.255"];
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150
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151 if (sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) > size) {
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152 errno = ENOSPC;
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153 return (NULL);
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154 }
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155 strcpy(dst, tmp);
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156 return (dst);
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157 }
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158
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159 #ifdef CYGPKG_NET_INET6
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160 /* const char *
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161 * inet_ntop6(src, dst, size)
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162 * convert IPv6 binary address into presentation (printable) format
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163 * author:
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164 * Paul Vixie, 1996.
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165 */
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166 static const char *
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167 inet_ntop6(const u_char *src, char *dst, size_t size)
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168 {
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169 /*
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170 * Note that int32_t and int16_t need only be "at least" large enough
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171 * to contain a value of the specified size. On some systems, like
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172 * Crays, there is no such thing as an integer variable with 16 bits.
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173 * Keep this in mind if you think this function should have been coded
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174 * to use pointer overlays. All the world's not a VAX.
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175 */
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176 #if 0 // This is too optimistic
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177 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
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178 #else
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179 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"], *tp;
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180 #endif
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181 struct { int base, len; } best, cur;
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182 u_int words[IN6ADDRSZ / INT16SZ];
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183 int i;
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184
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185 /*
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186 * Preprocess:
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187 * Copy the input (bytewise) array into a wordwise array.
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188 * Find the longest run of 0x00's in src[] for :: shorthanding.
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189 */
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190 memset(words, '\0', sizeof words);
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191 for (i = 0; i < IN6ADDRSZ; i++)
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192 words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
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193 best.len = 0;
208
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194 best.base = -1;
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195 cur.len = 0;
208
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196 cur.base = -1;
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197 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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198 if (words[i] == 0) {
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199 if (cur.base == -1)
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200 cur.base = i, cur.len = 1;
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201 else
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202 cur.len++;
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203 } else {
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204 if (cur.base != -1) {
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205 if (best.base == -1 || cur.len > best.len)
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206 best = cur;
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207 cur.base = -1;
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208 }
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209 }
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210 }
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211 if (cur.base != -1) {
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212 if (best.base == -1 || cur.len > best.len)
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213 best = cur;
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214 }
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215 if (best.base != -1 && best.len < 2)
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216 best.base = -1;
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217
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218 /*
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219 * Format the result.
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220 */
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221 tp = tmp;
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222 for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) {
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223 /* Are we inside the best run of 0x00's? */
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224 if (best.base != -1 && i >= best.base &&
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225 i < (best.base + best.len)) {
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226 if (i == best.base)
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227 *tp++ = ':';
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228 continue;
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229 }
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230 /* Are we following an initial run of 0x00s or any real hex? */
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231 if (i != 0)
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232 *tp++ = ':';
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233 /* Is this address an encapsulated IPv4? */
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234 if (i == 6 && best.base == 0 &&
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235 (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) {
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236 if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
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237 return (NULL);
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238 tp += strlen(tp);
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239 break;
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240 }
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241 tp += sprintf(tp, "%x", words[i]);
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242 }
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243 /* Was it a trailing run of 0x00's? */
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244 if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
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245 *tp++ = ':';
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246 *tp++ = '\0';
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247
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248 /*
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249 * Check for overflow, copy, and we're done.
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250 */
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251 if ((size_t)(tp - tmp) > size) {
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252 errno = ENOSPC;
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253 return (NULL);
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254 }
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255 strcpy(dst, tmp);
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256 return (dst);
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257 }
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258 #endif