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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 marka Exp $";
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "utils/builtins.h"
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#include "utils/inet.h"
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#define NS_IN6ADDRSZ 16
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#define SPRINTF(x) strlen(sprintf/**/x)
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#define SPRINTF(x) ((size_t)sprintf x)
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static char *inet_net_ntop_ipv4(const u_char *src, int bits,
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char *dst, size_t size);
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static char *inet_cidr_ntop_ipv4(const u_char *src, int bits,
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char *dst, size_t size);
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static char *inet_net_ntop_ipv6(const u_char *src, int bits,
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char *dst, size_t size);
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static char *inet_cidr_ntop_ipv6(const u_char *src, int bits,
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char *dst, size_t size);
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* inet_cidr_ntop(af, src, bits, dst, size)
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* convert network number from network to presentation format.
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* generates CIDR style result always.
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* pointer to dst, or NULL if an error occurred (check errno).
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* Paul Vixie (ISC), July 1996
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inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size)
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return (inet_cidr_ntop_ipv4(src, bits, dst, size));
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return (inet_cidr_ntop_ipv6(src, bits, dst, size));
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* inet_cidr_ntop_ipv4(src, bits, dst, size)
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* convert IPv4 network number from network to presentation format.
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* generates CIDR style result always.
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* pointer to dst, or NULL if an error occurred (check errno).
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* Paul Vixie (ISC), July 1996
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inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
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if (bits < 0 || bits > 32)
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if (size < sizeof "0")
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/* Format whole octets. */
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for (b = bits / 8; b > 0; b--)
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if (size <= sizeof "255.")
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dst += SPRINTF((dst, "%u", *src++));
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size -= (size_t) (dst - t);
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/* Format partial octet. */
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if (size <= sizeof ".255")
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m = ((1 << b) - 1) << (8 - b);
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dst += SPRINTF((dst, "%u", *src & m));
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size -= (size_t) (dst - t);
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/* Format CIDR /width. */
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if (size <= sizeof "/32")
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dst += SPRINTF((dst, "/%u", bits));
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* inet_cidr_ntop_ipv6(src, bits, fakebits, dst, size)
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* convert IPv6 network number from network to presentation format.
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* generates CIDR style result always. Picks the shortest representation
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* unless the IP is really IPv4.
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* always prints specified number of bits (bits).
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* pointer to dst, or NULL if an error occurred (check errno).
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0x11110000 in its fourth octet.
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* Vadim Kogan (UCB), June 2001
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* Original version (IPv4) by Paul Vixie (ISC), July 1996
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inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
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unsigned char inbuf[16];
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char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
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if (bits < 0 || bits > 128)
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/* Copy src to private buffer. Zero host part. */
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memcpy(inbuf, src, p);
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memset(inbuf + p, 0, 16 - p);
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/* how many words need to be displayed in output */
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words = (bits + 15) / 16;
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/* Find the longest substring of zero's */
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zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
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for (i = 0; i < (words * 2); i += 2)
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if ((s[i] | s[i + 1]) == 0)
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if (tmp_zero_l && zero_l < tmp_zero_l)
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if (tmp_zero_l && zero_l < tmp_zero_l)
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if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
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((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
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((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
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/* Format whole words. */
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for (p = 0; p < words; p++)
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if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l)
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/* Time to skip some zeros */
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if (is_ipv4 && p > 5)
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*cp++ = (p == 6) ? ':' : '.';
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cp += SPRINTF((cp, "%u", *s++));
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/* we can potentially drop the last octet */
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if (p != 7 || bits > 120)
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cp += SPRINTF((cp, "%u", *s++));
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cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
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/* Format CIDR /width. */
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(void) SPRINTF((cp, "/%u", bits));
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if (strlen(outbuf) + 1 > size)
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* inet_net_ntop(af, src, bits, dst, size)
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* convert host/network address from network to presentation format.
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* "src"'s size is determined from its "af".
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* pointer to dst, or NULL if an error occurred (check errno).
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* 192.5.5.1/28 has a nonzero host part, which means it isn't a network
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* as called for by inet_net_pton() but it can be a host address with
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* an included netmask.
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* Paul Vixie (ISC), October 1998
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inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
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return (inet_net_ntop_ipv4(src, bits, dst, size));
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return (inet_net_ntop_ipv6(src, bits, dst, size));
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errno = EAFNOSUPPORT;
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* inet_net_ntop_ipv4(src, bits, dst, size)
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* convert IPv4 network address from network to presentation format.
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* "src"'s size is determined from its "af".
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* pointer to dst, or NULL if an error occurred (check errno).
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* Paul Vixie (ISC), October 1998
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inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
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if (bits < 0 || bits > 32)
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/* Always format all four octets, regardless of mask length. */
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for (b = len; b > 0; b--)
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if (size <= sizeof ".255")
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dst += SPRINTF((dst, "%u", *src++));
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size -= (size_t) (dst - t);
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/* don't print masklen if 32 bits */
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if (size <= sizeof "/32")
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dst += SPRINTF((dst, "/%u", bits));
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decoct(const u_char *src, int bytes, char *dst, size_t size)
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for (b = 1; b <= bytes; b++)
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if (size <= sizeof "255.")
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dst += SPRINTF((dst, "%u", *src++));
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size -= (size_t) (dst - t);
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inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
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* Note that int32_t and int16_t need only be "at least" large enough to
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* contain a value of the specified size. On some systems, like Crays,
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* there is no such thing as an integer variable with 16 bits. Keep this
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* in mind if you think this function should have been coded to use
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* pointer overlays. All the world's not a VAX.
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char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
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u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
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if ((bits < -1) || (bits > 128))
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* Preprocess: Copy the input (bytewise) array into a wordwise array. Find
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* the longest run of 0x00's in src[] for :: shorthanding.
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memset(words, '\0', sizeof words);
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for (i = 0; i < NS_IN6ADDRSZ; i++)
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words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
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cur.base = i, cur.len = 1;
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if (best.base == -1 || cur.len > best.len)
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if (best.base == -1 || cur.len > best.len)
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if (best.base != -1 && best.len < 2)
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
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/* Are we inside the best run of 0x00's? */
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if (best.base != -1 && i >= best.base &&
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i < (best.base + best.len))
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/* Are we following an initial run of 0x00s or any real hex? */
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/* Is this address an encapsulated IPv4? */
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if (i == 6 && best.base == 0 && (best.len == 6 ||
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(best.len == 7 && words[7] != 0x0001) ||
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(best.len == 5 && words[5] == 0xffff)))
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n = decoct(src + 12, 4, tp, sizeof tmp - (tp - tmp));
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tp += SPRINTF((tp, "%x", words[i]));
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/* Was it a trailing run of 0x00's? */
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if (best.base != -1 && (best.base + best.len) ==
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(NS_IN6ADDRSZ / NS_INT16SZ))
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if (bits != -1 && bits != 128)
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tp += SPRINTF((tp, "/%u", bits));
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* Check for overflow, copy, and we're done.
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if ((size_t) (tp - tmp) > size)