1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright 2003 Sun Microsystems, Inc. All rights reserved. 3*0Sstevel@tonic-gate * Use is subject to license terms. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate 6*0Sstevel@tonic-gate /* Copyright (c) 1996 by Internet Software Consortium. 7*0Sstevel@tonic-gate * 8*0Sstevel@tonic-gate * Permission to use, copy, modify, and distribute this software for any 9*0Sstevel@tonic-gate * purpose with or without fee is hereby granted, provided that the above 10*0Sstevel@tonic-gate * copyright notice and this permission notice appear in all copies. 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 13*0Sstevel@tonic-gate * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 14*0Sstevel@tonic-gate * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 15*0Sstevel@tonic-gate * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 16*0Sstevel@tonic-gate * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 17*0Sstevel@tonic-gate * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 18*0Sstevel@tonic-gate * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 19*0Sstevel@tonic-gate * SOFTWARE. 20*0Sstevel@tonic-gate */ 21*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 22*0Sstevel@tonic-gate 23*0Sstevel@tonic-gate #include <stdlib.h> 24*0Sstevel@tonic-gate #include <ctype.h> 25*0Sstevel@tonic-gate #include <string.h> 26*0Sstevel@tonic-gate #include <strings.h> 27*0Sstevel@tonic-gate #include <netdb.h> 28*0Sstevel@tonic-gate #include <stdio.h> 29*0Sstevel@tonic-gate #include <arpa/inet.h> 30*0Sstevel@tonic-gate #include <netinet/in.h> 31*0Sstevel@tonic-gate #include <sys/socket.h> 32*0Sstevel@tonic-gate #include <errno.h> 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate static const char *inet_ntop4(const u_char *, char *, socklen_t); 35*0Sstevel@tonic-gate static const char *inet_ntop6(const u_char *, char *, socklen_t); 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate /* char * 38*0Sstevel@tonic-gate * inet_ntop(af, src, dst, size) 39*0Sstevel@tonic-gate * convert a network format address to presentation format. 40*0Sstevel@tonic-gate * return: 41*0Sstevel@tonic-gate * pointer to presentation format address (`dst'), or NULL (see errno). 42*0Sstevel@tonic-gate */ 43*0Sstevel@tonic-gate const char * 44*0Sstevel@tonic-gate inet_ntop(int af, const void *src, char *dst, socklen_t size) 45*0Sstevel@tonic-gate { 46*0Sstevel@tonic-gate switch (af) { 47*0Sstevel@tonic-gate case AF_INET: 48*0Sstevel@tonic-gate return (inet_ntop4(src, dst, size)); 49*0Sstevel@tonic-gate case AF_INET6: 50*0Sstevel@tonic-gate return (inet_ntop6(src, dst, size)); 51*0Sstevel@tonic-gate default: 52*0Sstevel@tonic-gate errno = EAFNOSUPPORT; 53*0Sstevel@tonic-gate return (NULL); 54*0Sstevel@tonic-gate } 55*0Sstevel@tonic-gate /* NOTREACHED */ 56*0Sstevel@tonic-gate } 57*0Sstevel@tonic-gate 58*0Sstevel@tonic-gate /* const char * 59*0Sstevel@tonic-gate * inet_ntop4(src, dst, size) 60*0Sstevel@tonic-gate * format an IPv4 address, more or less like inet_ntoa() 61*0Sstevel@tonic-gate * return: 62*0Sstevel@tonic-gate * `dst' (as a const) 63*0Sstevel@tonic-gate * notes: 64*0Sstevel@tonic-gate * (1) uses no statics 65*0Sstevel@tonic-gate * (2) takes a u_char* not an in_addr as input 66*0Sstevel@tonic-gate */ 67*0Sstevel@tonic-gate 68*0Sstevel@tonic-gate #ifdef SPRINTF_CHAR 69*0Sstevel@tonic-gate # define SPRINTF(x) strlen(sprintf/**/x) 70*0Sstevel@tonic-gate #else 71*0Sstevel@tonic-gate # define SPRINTF(x) ((size_t)sprintf x) 72*0Sstevel@tonic-gate #endif 73*0Sstevel@tonic-gate 74*0Sstevel@tonic-gate static const char * 75*0Sstevel@tonic-gate inet_ntop4(const u_char *src, char *dst, socklen_t size) 76*0Sstevel@tonic-gate { 77*0Sstevel@tonic-gate static const char fmt[] = "%u.%u.%u.%u"; 78*0Sstevel@tonic-gate char tmp[sizeof "255.255.255.255"]; 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) > size) { 81*0Sstevel@tonic-gate errno = ENOSPC; 82*0Sstevel@tonic-gate return (NULL); 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate strcpy(dst, tmp); 85*0Sstevel@tonic-gate return (dst); 86*0Sstevel@tonic-gate } 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate /* const char * 89*0Sstevel@tonic-gate * inet_ntop6(src, dst, size) 90*0Sstevel@tonic-gate * convert IPv6 binary address into presentation (printable) format 91*0Sstevel@tonic-gate */ 92*0Sstevel@tonic-gate #define INADDRSZ 4 93*0Sstevel@tonic-gate #define IN6ADDRSZ 16 94*0Sstevel@tonic-gate #define INT16SZ 2 95*0Sstevel@tonic-gate static const char * 96*0Sstevel@tonic-gate inet_ntop6(const u_char *src, char *dst, socklen_t size) 97*0Sstevel@tonic-gate { 98*0Sstevel@tonic-gate /* 99*0Sstevel@tonic-gate * Note that int32_t and int16_t need only be "at least" large enough 100*0Sstevel@tonic-gate * to contain a value of the specified size. On some systems, like 101*0Sstevel@tonic-gate * Crays, there is no such thing as an integer variable with 16 bits. 102*0Sstevel@tonic-gate * Keep this in mind if you think this function should have been coded 103*0Sstevel@tonic-gate * to use pointer overlays. All the world's not a VAX. 104*0Sstevel@tonic-gate */ 105*0Sstevel@tonic-gate char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; 106*0Sstevel@tonic-gate struct { int base, len; } best, cur; 107*0Sstevel@tonic-gate u_int words[IN6ADDRSZ / INT16SZ]; 108*0Sstevel@tonic-gate int i; 109*0Sstevel@tonic-gate 110*0Sstevel@tonic-gate /* 111*0Sstevel@tonic-gate * Preprocess: 112*0Sstevel@tonic-gate * Copy the input (bytewise) array into a wordwise array. 113*0Sstevel@tonic-gate * Find the longest run of 0x00's in src[] for :: shorthanding. 114*0Sstevel@tonic-gate */ 115*0Sstevel@tonic-gate memset(words, '\0', sizeof words); 116*0Sstevel@tonic-gate for (i = 0; i < IN6ADDRSZ; i++) 117*0Sstevel@tonic-gate words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); 118*0Sstevel@tonic-gate best.base = -1; 119*0Sstevel@tonic-gate cur.base = -1; 120*0Sstevel@tonic-gate for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { 121*0Sstevel@tonic-gate if (words[i] == 0) { 122*0Sstevel@tonic-gate if (cur.base == -1) 123*0Sstevel@tonic-gate cur.base = i, cur.len = 1; 124*0Sstevel@tonic-gate else 125*0Sstevel@tonic-gate cur.len++; 126*0Sstevel@tonic-gate } else { 127*0Sstevel@tonic-gate if (cur.base != -1) { 128*0Sstevel@tonic-gate if (best.base == -1 || cur.len > best.len) 129*0Sstevel@tonic-gate best = cur; 130*0Sstevel@tonic-gate cur.base = -1; 131*0Sstevel@tonic-gate } 132*0Sstevel@tonic-gate } 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate if (cur.base != -1) { 135*0Sstevel@tonic-gate if (best.base == -1 || cur.len > best.len) 136*0Sstevel@tonic-gate best = cur; 137*0Sstevel@tonic-gate } 138*0Sstevel@tonic-gate if (best.base != -1 && best.len < 2) 139*0Sstevel@tonic-gate best.base = -1; 140*0Sstevel@tonic-gate 141*0Sstevel@tonic-gate /* 142*0Sstevel@tonic-gate * Format the result. 143*0Sstevel@tonic-gate */ 144*0Sstevel@tonic-gate tp = tmp; 145*0Sstevel@tonic-gate for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++) { 146*0Sstevel@tonic-gate /* Are we inside the best run of 0x00's? */ 147*0Sstevel@tonic-gate if (best.base != -1 && i >= best.base && 148*0Sstevel@tonic-gate i < (best.base + best.len)) { 149*0Sstevel@tonic-gate if (i == best.base) 150*0Sstevel@tonic-gate *tp++ = ':'; 151*0Sstevel@tonic-gate continue; 152*0Sstevel@tonic-gate } 153*0Sstevel@tonic-gate /* Are we following an initial run of 0x00s or any real hex? */ 154*0Sstevel@tonic-gate if (i != 0) 155*0Sstevel@tonic-gate *tp++ = ':'; 156*0Sstevel@tonic-gate /* Is this address an encapsulated IPv4? */ 157*0Sstevel@tonic-gate if (i == 6 && best.base == 0 && 158*0Sstevel@tonic-gate (best.len == 6 || (best.len == 5 && words[5] == 0xffff))) { 159*0Sstevel@tonic-gate if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) 160*0Sstevel@tonic-gate return (NULL); 161*0Sstevel@tonic-gate tp += strlen(tp); 162*0Sstevel@tonic-gate break; 163*0Sstevel@tonic-gate } 164*0Sstevel@tonic-gate tp += SPRINTF((tp, "%x", words[i])); 165*0Sstevel@tonic-gate } 166*0Sstevel@tonic-gate /* Was it a trailing run of 0x00's? */ 167*0Sstevel@tonic-gate if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) 168*0Sstevel@tonic-gate *tp++ = ':'; 169*0Sstevel@tonic-gate *tp++ = '\0'; 170*0Sstevel@tonic-gate 171*0Sstevel@tonic-gate /* 172*0Sstevel@tonic-gate * Check for overflow, copy, and we're done. 173*0Sstevel@tonic-gate */ 174*0Sstevel@tonic-gate if ((int)(tp - tmp) > size) { 175*0Sstevel@tonic-gate errno = ENOSPC; 176*0Sstevel@tonic-gate return (NULL); 177*0Sstevel@tonic-gate } 178*0Sstevel@tonic-gate strcpy(dst, tmp); 179*0Sstevel@tonic-gate return (dst); 180*0Sstevel@tonic-gate } 181*0Sstevel@tonic-gate 182