#include "inet_aton.h" #ifdef __cplusplus extern "C" { #endif /* * Copyright (C) 1996-2001 Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef HAVE_INET_NTOP #define NS_INT16SZ 2 #define NS_INADDRSZ 4 #define NS_IN6ADDRSZ 16 /* * WARNING: Don't even consider trying to compile this on a system where * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. */ /* char * * isc_net_ntop(af, src, dst, size) * convert a network format address to presentation format. * return: * pointer to presentation format address (`dst'), or NULL (see errno). * author: * Paul Vixie, 1996. */ const char* inet_ntop(int af, const void *src, char *dst, socklen_t size) { switch ( af ) { case AF_INET: return(inet_ntop4(src, dst, size)); #ifdef HAVE_IPV6 case AF_INET6: return(inet_ntop6(src, dst, size)); #endif default: return NULL; } /* NOTREACHED */ } /* const char * * inet_ntop4(src, dst, size) * format an IPv4 address * return: * `dst' (as a const) * notes: * (1) uses no statics * (2) takes a unsigned char* not an in_addr as input * author: * Paul Vixie, 1996. */ const char* inet_ntop4(const unsigned char *src, char *dst, socklen_t size) { static const char *fmt = "%u.%u.%u.%u"; char tmp[sizeof "255.255.255.255"]; if ( (size_t)sprintf(tmp, fmt, src[0], src[1], src[2], src[3]) >= size ) { return NULL; } strcpy(dst, tmp); return dst; } /* const char * * isc_inet_ntop6(src, dst, size) * convert IPv6 binary address into presentation (printable) format * author: * Paul Vixie, 1996. */ #ifdef HAVE_IPV6 const char* inet_ntop6(const unsigned char *src, char *dst, socklen_t size) { /* * Note that int32_t and int16_t need only be "at least" large enough * to contain a value of the specified size. On some systems, like * Crays, there is no such thing as an integer variable with 16 bits. * Keep this in mind if you think this function should have been coded * to use pointer overlays. All the world's not a VAX. */ char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp; struct { int base, len; } best, cur; unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ]; int i; /* * Preprocess: * Copy the input (bytewise) array into a wordwise array. * Find the longest run of 0x00's in src[] for :: shorthanding. */ memset(words, '\0', sizeof words); for ( i = 0; i < NS_IN6ADDRSZ; i++ ) words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3)); best.base = -1; cur.base = -1; for ( i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++ ) { if ( words[i] == 0 ) { if ( cur.base == -1 ) cur.base = i, cur.len = 1; else cur.len++; } else { if ( cur.base != -1 ) { if ( best.base == -1 || cur.len > best.len ) best = cur; cur.base = -1; } } } if ( cur.base != -1 ) { if ( best.base == -1 || cur.len > best.len ) best = cur; } if ( best.base != -1 && best.len < 2 ) best.base = -1; /* * Format the result. */ tp = tmp; for ( i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++ ) { /* Are we inside the best run of 0x00's? */ if ( best.base != -1 && i >= best.base && i < (best.base + best.len) ) { if ( i == best.base ) *tp++ = ':'; continue; } /* Are we following an initial run of 0x00s or any real hex? */ if ( i != 0 ) *tp++ = ':'; /* Is this address an encapsulated IPv4? */ if ( i == 6 && best.base == 0 && (best.len == 6 || (best.len == 5 && words[5] == 0xffff)) ) { if ( !inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)) ) return NULL; tp += strlen(tp); break; } tp += sprintf(tp, "%x", words[i]); } /* Was it a trailing run of 0x00's? */ if ( best.base != -1 && (best.base + best.len) == (NS_IN6ADDRSZ / NS_INT16SZ) ) *tp++ = ':'; *tp++ = '\0'; /* * Check for overflow, copy, and we're done. */ if ( (size_t)(tp - tmp) > size ) { errno = ENOSPC; return NULL; } strcpy(dst, tmp); return dst; } #endif /* HAVE_IPV6 */ #endif /* HAVE_INET_NTOP */ #ifdef __cplusplus } /* end extern "C" */ #endif