diff options
Diffstat (limited to 'compat/inet_ntop.c')
| -rw-r--r-- | compat/inet_ntop.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/compat/inet_ntop.c b/compat/inet_ntop.c new file mode 100644 index 0000000..d34e737 --- /dev/null +++ b/compat/inet_ntop.c @@ -0,0 +1,210 @@ +#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. +*/ + +// support for hiding v4 addresses from outputs +const char* +inet_ntop_hide(int af, const void *src, char *dst, socklen_t size) { + switch ( af ) { + case AF_INET: + return(inet_ntop4_hide(src, dst, size)); + default: + return NULL; + } + /* NOTREACHED */ +} +const char* +inet_ntop4_hide(const unsigned char *src, char *dst, socklen_t size) { + static const char *fmt = "%s.%s.%s.%u"; + char tmp[sizeof "255.255.255.255"]; + + if ( (size_t)sprintf(tmp, fmt, "*","*","*", src[3]) >= size ) { + return NULL; + } + strcpy(dst, tmp); + + return dst; +} + + +#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)); +#if 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. + */ +#if 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; + 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 == 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 |