/* * Copyright (C) 1996-2023 The Squid Software Foundation and contributors * * Squid software is distributed under GPLv2+ license and includes * contributions from numerous individuals and organizations. * Please see the COPYING and CONTRIBUTORS files for details. */ /* * Shamelessly duplicated from the bind9 public sources * for use by the Squid Project under ISC written permission * included "as found" below. * * Update/Maintenance History: * * 24-Sep-2007 : Copied from bind 9.3.3 * - Added protection around libray headers * - Altered configure checks * - Un-hacked slightly to use system gethostbyname() * * 06-Oct-2007 : Various fixes to allow the build on MinGW * * 28-Oct-2007: drop some dead code. now tested working without. * * 04-Nov-2010: drop SPRINTF casting macro * * 13-Jan-2015 : Various fixed for C++ and MinGW native build * * Original License and code follows. */ #include "squid.h" #if !HAVE_DECL_INET_NTOP /* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-1999 by 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 ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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. */ #if defined(LIBC_SCCS) && !defined(lint) static const char rcsid[] = "inet_ntop.c,v 1.1.2.1.8.2 2005/11/03 23:08:40 marka Exp"; #endif /* LIBC_SCCS and not lint */ #if HAVE_SYS_PARAM_H #include #endif #if HAVE_SYS_TYPES_H #include #endif #if HAVE_SYS_SOCKET_H #include #endif #if HAVE_NETINET_IN_H #include #endif #if HAVE_ARPA_INET_H #include #endif #if HAVE_ARPA_NAMESER_H #include #endif #if HAVE_ERRNO_H #include #endif #if HAVE_STRING_H #include #endif #if ! defined(NS_INADDRSZ) #define NS_INADDRSZ 4 #endif #if ! defined(NS_IN6ADDRSZ) #define NS_IN6ADDRSZ 16 #endif #if ! defined(NS_INT16SZ) #define NS_INT16SZ 2 #endif /* * 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. */ static const char *inet_ntop4 (const u_char *src, char *dst, size_t size); static const char *inet_ntop6 (const u_char *src, char *dst, size_t size); /* char * * inet_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 * xinet_ntop(int af, const void *src, char *dst, size_t size) { switch (af) { case AF_INET: return (inet_ntop4((const u_char*)src, dst, size)); case AF_INET6: return (inet_ntop6((const u_char*)src, dst, size)); default: errno = EAFNOSUPPORT; 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 u_char* not an in_addr as input * author: * Paul Vixie, 1996. */ static const char * inet_ntop4(const u_char *src, char *dst, size_t size) { static const char fmt[] = "%u.%u.%u.%u"; char tmp[sizeof("255.255.255.255")+1]; if ((size_t)snprintf(tmp, min(sizeof(tmp),size), fmt, src[0], src[1], src[2], src[3]) >= size) { errno = ENOSPC; return (NULL); } strcpy(dst, tmp); return (dst); } /* const char * * inet_ntop6(src, dst, size) * convert IPv6 binary address into presentation (printable) format * author: * Paul Vixie, 1996. */ static const char * inet_ntop6(const u_char *src, char *dst, size_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; u_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; best.len = 0; cur.base = -1; cur.len = 0; 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 == 7 && words[7] != 0x0001) || (best.len == 5 && words[5] == 0xffff))) { if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) return (NULL); tp += strlen(tp); break; } tp += snprintf(tp, (tmp + sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") - 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_DECL_INET_NTOP */