1d7ce700605e1af0e455e31ec11f19ff21d26b525darylm/* 2d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * Copyright (c) 1996 by Internet Software Consortium. 3d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * 4d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * Permission to use, copy, modify, and distribute this software for any 5d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * purpose with or without fee is hereby granted, provided that the above 6d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * copyright notice and this permission notice appear in all copies. 7d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * 8d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 9d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 10d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 11d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 12d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 13d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 14d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 15d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * SOFTWARE. 16d7ce700605e1af0e455e31ec11f19ff21d26b525darylm */ 17d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 18d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#if defined(LIBC_SCCS) && !defined(lint) 19d7ce700605e1af0e455e31ec11f19ff21d26b525darylmstatic const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; 20d7ce700605e1af0e455e31ec11f19ff21d26b525darylmstatic const char rcsid[] = "$Id: inet_net_ntop.c,v 1.1.1.1 2003/11/19 01:51:29 kyu3 Exp $"; 21d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#endif 22d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 23d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <sys/types.h> 24d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <sys/socket.h> 25d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <netinet/in.h> 26d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <arpa/inet.h> 27d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 28d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <errno.h> 29d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <stdio.h> 30d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <string.h> 31d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#include <stdlib.h> 32d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 33d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#ifdef SPRINTF_CHAR 34d7ce700605e1af0e455e31ec11f19ff21d26b525darylm# define SPRINTF(x) strlen(sprintf/**/x) 35d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#else 36d7ce700605e1af0e455e31ec11f19ff21d26b525darylm# define SPRINTF(x) ((size_t)sprintf x) 37d7ce700605e1af0e455e31ec11f19ff21d26b525darylm#endif 38d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 39d7ce700605e1af0e455e31ec11f19ff21d26b525darylmstatic char * inet_net_ntop_ipv4 (const u_char *src, int bits, 40d7ce700605e1af0e455e31ec11f19ff21d26b525darylm char *dst, size_t size); 41d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 42d7ce700605e1af0e455e31ec11f19ff21d26b525darylm/* 43d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * char * 44d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * inet_net_ntop(af, src, bits, dst, size) 45d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * convert network number from network to presentation format. 46d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * generates CIDR style result always. 47d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * return: 48d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * pointer to dst, or NULL if an error occurred (check errno). 49d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * author: 50d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * Paul Vixie (ISC), July 1996 51d7ce700605e1af0e455e31ec11f19ff21d26b525darylm */ 52d7ce700605e1af0e455e31ec11f19ff21d26b525darylmchar * 53d7ce700605e1af0e455e31ec11f19ff21d26b525darylminet_net_ntop( 54d7ce700605e1af0e455e31ec11f19ff21d26b525darylm int af, 55d7ce700605e1af0e455e31ec11f19ff21d26b525darylm const void *src, 56d7ce700605e1af0e455e31ec11f19ff21d26b525darylm int bits, 57d7ce700605e1af0e455e31ec11f19ff21d26b525darylm char *dst, 58d7ce700605e1af0e455e31ec11f19ff21d26b525darylm size_t size 59d7ce700605e1af0e455e31ec11f19ff21d26b525darylm ) 60d7ce700605e1af0e455e31ec11f19ff21d26b525darylm{ 61d7ce700605e1af0e455e31ec11f19ff21d26b525darylm switch (af) { 62d7ce700605e1af0e455e31ec11f19ff21d26b525darylm case AF_INET: 63d7ce700605e1af0e455e31ec11f19ff21d26b525darylm return (inet_net_ntop_ipv4(src, bits, dst, size)); 64d7ce700605e1af0e455e31ec11f19ff21d26b525darylm default: 65d7ce700605e1af0e455e31ec11f19ff21d26b525darylm errno = EAFNOSUPPORT; 66d7ce700605e1af0e455e31ec11f19ff21d26b525darylm return (NULL); 67d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 68d7ce700605e1af0e455e31ec11f19ff21d26b525darylm} 69d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 70d7ce700605e1af0e455e31ec11f19ff21d26b525darylm/* 71d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * static char * 72d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * inet_net_ntop_ipv4(src, bits, dst, size) 73d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * convert IPv4 network number from network to presentation format. 74d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * generates CIDR style result always. 75d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * return: 76d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * pointer to dst, or NULL if an error occurred (check errno). 77d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * note: 78d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * network byte order assumed. this means 192.5.5.240/28 has 79d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * 0x11110000 in its fourth octet. 80d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * author: 81d7ce700605e1af0e455e31ec11f19ff21d26b525darylm * Paul Vixie (ISC), July 1996 82d7ce700605e1af0e455e31ec11f19ff21d26b525darylm */ 83d7ce700605e1af0e455e31ec11f19ff21d26b525darylmstatic char * 84d7ce700605e1af0e455e31ec11f19ff21d26b525darylminet_net_ntop_ipv4( 85d7ce700605e1af0e455e31ec11f19ff21d26b525darylm const u_char *src, 86d7ce700605e1af0e455e31ec11f19ff21d26b525darylm int bits, 87d7ce700605e1af0e455e31ec11f19ff21d26b525darylm char *dst, 88d7ce700605e1af0e455e31ec11f19ff21d26b525darylm size_t size 89d7ce700605e1af0e455e31ec11f19ff21d26b525darylm ) 90d7ce700605e1af0e455e31ec11f19ff21d26b525darylm{ 91d7ce700605e1af0e455e31ec11f19ff21d26b525darylm char *odst = dst; 92d7ce700605e1af0e455e31ec11f19ff21d26b525darylm char *t; 93d7ce700605e1af0e455e31ec11f19ff21d26b525darylm u_int m; 94d7ce700605e1af0e455e31ec11f19ff21d26b525darylm int b; 95d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 96d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (bits < 0 || bits > 32) { 97d7ce700605e1af0e455e31ec11f19ff21d26b525darylm errno = EINVAL; 98d7ce700605e1af0e455e31ec11f19ff21d26b525darylm return (NULL); 99d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 100d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (bits == 0) { 101d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (size < sizeof "0") 102d7ce700605e1af0e455e31ec11f19ff21d26b525darylm goto emsgsize; 103d7ce700605e1af0e455e31ec11f19ff21d26b525darylm *dst++ = '0'; 104d7ce700605e1af0e455e31ec11f19ff21d26b525darylm *dst = '\0'; 105d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 106d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 107d7ce700605e1af0e455e31ec11f19ff21d26b525darylm /* Format whole octets. */ 108d7ce700605e1af0e455e31ec11f19ff21d26b525darylm for (b = bits / 8; b > 0; b--) { 109d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (size < sizeof "255.") 110d7ce700605e1af0e455e31ec11f19ff21d26b525darylm goto emsgsize; 111d7ce700605e1af0e455e31ec11f19ff21d26b525darylm t = dst; 112d7ce700605e1af0e455e31ec11f19ff21d26b525darylm dst += SPRINTF((dst, "%u", *src++)); 113d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (b > 1) { 114d7ce700605e1af0e455e31ec11f19ff21d26b525darylm *dst++ = '.'; 115d7ce700605e1af0e455e31ec11f19ff21d26b525darylm *dst = '\0'; 116d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 117d7ce700605e1af0e455e31ec11f19ff21d26b525darylm size -= (size_t)(dst - t); 118d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 119d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 120d7ce700605e1af0e455e31ec11f19ff21d26b525darylm /* Format partial octet. */ 121d7ce700605e1af0e455e31ec11f19ff21d26b525darylm b = bits % 8; 122d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (b > 0) { 123d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (size < sizeof ".255") 124d7ce700605e1af0e455e31ec11f19ff21d26b525darylm goto emsgsize; 125d7ce700605e1af0e455e31ec11f19ff21d26b525darylm t = dst; 126d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (dst != odst) 127d7ce700605e1af0e455e31ec11f19ff21d26b525darylm *dst++ = '.'; 128d7ce700605e1af0e455e31ec11f19ff21d26b525darylm m = ((1 << b) - 1) << (8 - b); 1297700f0f5c0ab90bf052e33fa0ddd2f2aa7e7893elpleahy dst += SPRINTF((dst, "%u", ((unsigned int)(*src & m)))); 130d7ce700605e1af0e455e31ec11f19ff21d26b525darylm size -= (size_t)(dst - t); 131d7ce700605e1af0e455e31ec11f19ff21d26b525darylm } 132d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 133d7ce700605e1af0e455e31ec11f19ff21d26b525darylm /* Format CIDR /width. */ 134d7ce700605e1af0e455e31ec11f19ff21d26b525darylm if (size < sizeof "/32") 135d7ce700605e1af0e455e31ec11f19ff21d26b525darylm goto emsgsize; 136d7ce700605e1af0e455e31ec11f19ff21d26b525darylm dst += SPRINTF((dst, "/%u", bits)); 137d7ce700605e1af0e455e31ec11f19ff21d26b525darylm return (odst); 138d7ce700605e1af0e455e31ec11f19ff21d26b525darylm 139d7ce700605e1af0e455e31ec11f19ff21d26b525darylm emsgsize: 140d7ce700605e1af0e455e31ec11f19ff21d26b525darylm errno = EMSGSIZE; 141d7ce700605e1af0e455e31ec11f19ff21d26b525darylm return (NULL); 142d7ce700605e1af0e455e31ec11f19ff21d26b525darylm} 143