/* Copyright (c) 1996 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 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. */ #include "apr_private.h" #include "apr_arch_networkio.h" #include "apr_strings.h" #if APR_HAVE_SYS_TYPES_H #include #endif #if APR_HAVE_SYS_SOCKET_H #include #endif #if APR_HAVE_NETINET_IN_H #include #endif #if APR_HAVE_ARPA_INET_H #include #endif #include #if APR_HAVE_ERRNO_H #include #endif #include #ifndef IN6ADDRSZ #define IN6ADDRSZ 16 #endif #ifndef INT16SZ #define INT16SZ sizeof(apr_int16_t) #endif #ifndef __P #define __P(x) x #endif #if !defined(EAFNOSUPPORT) && defined(WSAEAFNOSUPPORT) #define EAFNOSUPPORT WSAEAFNOSUPPORT #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 __P((const unsigned char *src, char *dst, apr_size_t size)); #if APR_HAVE_IPV6 static const char *inet_ntop6 __P((const unsigned char *src, char *dst, apr_size_t size)); #endif /* 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 * apr_inet_ntop(int af, const void *src, char *dst, apr_size_t size) ###### { ###### switch (af) { case AF_INET: ###### return (inet_ntop4(src, dst, size)); #if APR_HAVE_IPV6 case AF_INET6: ###### return (inet_ntop6(src, dst, size)); #endif default: ###### errno = EAFNOSUPPORT; ###### return (NULL); } /* NOTREACHED */ } /* const char * * inet_ntop4(src, dst, size) * format an IPv4 address, more or less like inet_ntoa() * 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 unsigned char *src, char *dst, apr_size_t size) ###### { ###### const apr_size_t MIN_SIZE = 16; /* space for 255.255.255.255\0 */ ###### int n = 0; ###### char *next = dst; ###### if (size < MIN_SIZE) { ###### errno = ENOSPC; ###### return NULL; } ###### do { ###### unsigned char u = *src++; ###### if (u > 99) { ###### *next++ = '0' + u/100; ###### u %= 100; ###### *next++ = '0' + u/10; ###### u %= 10; } ###### else if (u > 9) { ###### *next++ = '0' + u/10; ###### u %= 10; } ###### *next++ = '0' + u; ###### *next++ = '.'; ###### n++; ###### } while (n < 4); ###### *--next = 0; ###### return dst; } #if APR_HAVE_IPV6 /* 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 unsigned char *src, char *dst, apr_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; ###### unsigned int words[IN6ADDRSZ / INT16SZ]; ###### int i; ###### const unsigned char *next_src, *src_end; ###### unsigned int *next_dest; /* * Preprocess: * Copy the input (bytewise) array into a wordwise array. * Find the longest run of 0x00's in src[] for :: shorthanding. */ ###### next_src = src; ###### src_end = src + IN6ADDRSZ; ###### next_dest = words; ###### best.base = -1; ###### cur.base = -1; ###### i = 0; ###### do { ###### unsigned int next_word = (unsigned int)*next_src++; ###### next_word <<= 8; ###### next_word |= (unsigned int)*next_src++; ###### *next_dest++ = next_word; ###### if (next_word == 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; } } ###### i++; ###### } while (next_src < src_end); ###### 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 < (IN6ADDRSZ / INT16SZ);) { /* Are we inside the best run of 0x00's? */ ###### if (i == best.base) { ###### *tp++ = ':'; ###### i += best.len; ###### 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 += apr_snprintf(tp, sizeof tmp - (tp - tmp), "%x", words[i]); ###### i++; } /* Was it a trailing run of 0x00's? */ ###### if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ)) { ###### *tp++ = ':'; } ###### *tp++ = '\0'; /* * Check for overflow, copy, and we're done. */ ###### if ((apr_size_t)(tp - tmp) > size) { ###### errno = ENOSPC; ###### return (NULL); } ###### strcpy(dst, tmp); ###### return (dst); } #endif