1 /* 2 * Copyright (c) 1999 - 2001 Kungliga Tekniska H�gskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifdef HAVE_CONFIG_H 35 #include <config.h> 36 RCSID("$Id: inet_ntop.c,v 1.5 2001/04/04 23:58:01 assar Exp $"); 37 #endif 38 39 #include <roken.h> 40 41 /* 42 * 43 */ 44 45 static const char * 46 inet_ntop_v4 (const void *src, char *dst, size_t size) 47 { 48 const char digits[] = "0123456789"; 49 int i; 50 struct in_addr *addr = (struct in_addr *)src; 51 u_long a = ntohl(addr->s_addr); 52 const char *orig_dst = dst; 53 54 if (size < INET_ADDRSTRLEN) { 55 errno = ENOSPC; 56 return NULL; 57 } 58 for (i = 0; i < 4; ++i) { 59 int n = (a >> (24 - i * 8)) & 0xFF; 60 int non_zerop = 0; 61 62 if (non_zerop || n / 100 > 0) { 63 *dst++ = digits[n / 100]; 64 n %= 100; 65 non_zerop = 1; 66 } 67 if (non_zerop || n / 10 > 0) { 68 *dst++ = digits[n / 10]; 69 n %= 10; 70 non_zerop = 1; 71 } 72 *dst++ = digits[n]; 73 if (i != 3) 74 *dst++ = '.'; 75 } 76 *dst++ = '\0'; 77 return orig_dst; 78 } 79 80 #ifdef HAVE_IPV6 81 static const char * 82 inet_ntop_v6 (const void *src, char *dst, size_t size) 83 { 84 const char xdigits[] = "0123456789abcdef"; 85 int i; 86 const struct in6_addr *addr = (struct in6_addr *)src; 87 const u_char *ptr = addr->s6_addr; 88 const char *orig_dst = dst; 89 90 if (size < INET6_ADDRSTRLEN) { 91 errno = ENOSPC; 92 return NULL; 93 } 94 for (i = 0; i < 8; ++i) { 95 int non_zerop = 0; 96 97 if (non_zerop || (ptr[0] >> 4)) { 98 *dst++ = xdigits[ptr[0] >> 4]; 99 non_zerop = 1; 100 } 101 if (non_zerop || (ptr[0] & 0x0F)) { 102 *dst++ = xdigits[ptr[0] & 0x0F]; 103 non_zerop = 1; 104 } 105 if (non_zerop || (ptr[1] >> 4)) { 106 *dst++ = xdigits[ptr[1] >> 4]; 107 non_zerop = 1; 108 } 109 *dst++ = xdigits[ptr[1] & 0x0F]; 110 if (i != 7) 111 *dst++ = ':'; 112 ptr += 2; 113 } 114 *dst++ = '\0'; 115 return orig_dst; 116 } 117 #endif /* HAVE_IPV6 */ 118 119 const char * 120 inet_ntop(int af, const void *src, char *dst, size_t size) 121 { 122 switch (af) { 123 case AF_INET : 124 return inet_ntop_v4 (src, dst, size); 125 #ifdef HAVE_IPV6 126 case AF_INET6 : 127 return inet_ntop_v6 (src, dst, size); 128 #endif 129 default : 130 errno = EAFNOSUPPORT; 131 return NULL; 132 } 133 } 134