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#include <config.h> 35 36#include "roken.h" 37 38/* 39 * 40 */ 41 42static const char * 43inet_ntop_v4 (const void *src, char *dst, size_t size) 44{ 45 const char digits[] = "0123456789"; 46 int i; 47 struct in_addr *addr = (struct in_addr *)src; 48 u_long a = ntohl(addr->s_addr); 49 const char *orig_dst = dst; 50 51 if (size < INET_ADDRSTRLEN) { 52 errno = ENOSPC; 53 return NULL; 54 } 55 for (i = 0; i < 4; ++i) { 56 int n = (a >> (24 - i * 8)) & 0xFF; 57 int non_zerop = 0; 58 59 if (non_zerop || n / 100 > 0) { 60 *dst++ = digits[n / 100]; 61 n %= 100; 62 non_zerop = 1; 63 } 64 if (non_zerop || n / 10 > 0) { 65 *dst++ = digits[n / 10]; 66 n %= 10; 67 non_zerop = 1; 68 } 69 *dst++ = digits[n]; 70 if (i != 3) 71 *dst++ = '.'; 72 } 73 *dst++ = '\0'; 74 return orig_dst; 75} 76 77#ifdef HAVE_IPV6 78static const char * 79inet_ntop_v6 (const void *src, char *dst, size_t size) 80{ 81 const char xdigits[] = "0123456789abcdef"; 82 int i; 83 const struct in6_addr *addr = (struct in6_addr *)src; 84 const u_char *ptr = addr->s6_addr; 85 const char *orig_dst = dst; 86 87 if (size < INET6_ADDRSTRLEN) { 88 errno = ENOSPC; 89 return NULL; 90 } 91 for (i = 0; i < 8; ++i) { 92 int non_zerop = 0; 93 94 if (non_zerop || (ptr[0] >> 4)) { 95 *dst++ = xdigits[ptr[0] >> 4]; 96 non_zerop = 1; 97 } 98 if (non_zerop || (ptr[0] & 0x0F)) { 99 *dst++ = xdigits[ptr[0] & 0x0F]; 100 non_zerop = 1; 101 } 102 if (non_zerop || (ptr[1] >> 4)) { 103 *dst++ = xdigits[ptr[1] >> 4]; 104 non_zerop = 1; 105 } 106 *dst++ = xdigits[ptr[1] & 0x0F]; 107 if (i != 7) 108 *dst++ = ':'; 109 ptr += 2; 110 } 111 *dst++ = '\0'; 112 return orig_dst; 113} 114#endif /* HAVE_IPV6 */ 115 116const char * ROKEN_LIB_FUNCTION 117inet_ntop(int af, const void *src, char *dst, size_t size) 118{ 119 switch (af) { 120 case AF_INET : 121 return inet_ntop_v4 (src, dst, size); 122#ifdef HAVE_IPV6 123 case AF_INET6 : 124 return inet_ntop_v6 (src, dst, size); 125#endif 126 default : 127 errno = EAFNOSUPPORT; 128 return NULL; 129 } 130} 131