2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 * src/backend/utils/adt/inet_net_ntop.c
20 #if defined(LIBC_SCCS) && !defined(lint)
21 static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 marka Exp $";
27 #include "postgres_fe.h"
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
36 #include "utils/inet.h"
39 * In a frontend build, we can't include inet.h, but we still need to have
40 * sensible definitions of these two constants. Note that inet_net_ntop()
41 * assumes that PGSQL_AF_INET is equal to AF_INET.
43 #define PGSQL_AF_INET (AF_INET + 0)
44 #define PGSQL_AF_INET6 (AF_INET + 1)
48 #define NS_IN6ADDRSZ 16
52 #define SPRINTF(x) strlen(sprintf/**/x)
54 #define SPRINTF(x) ((size_t)sprintf x)
57 static char *inet_net_ntop_ipv4(const u_char *src, int bits,
58 char *dst, size_t size);
59 static char *inet_net_ntop_ipv6(const u_char *src, int bits,
60 char *dst, size_t size);
65 * inet_net_ntop(af, src, bits, dst, size)
66 * convert host/network address from network to presentation format.
67 * "src"'s size is determined from its "af".
69 * pointer to dst, or NULL if an error occurred (check errno).
71 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
72 * as called for by inet_net_pton() but it can be a host address with
73 * an included netmask.
75 * Paul Vixie (ISC), October 1998
78 inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
81 * We need to cover both the address family constants used by the PG inet
82 * type (PGSQL_AF_INET and PGSQL_AF_INET6) and those used by the system
83 * libraries (AF_INET and AF_INET6). We can safely assume PGSQL_AF_INET
84 * == AF_INET, but the INET6 constants are very likely to be different. If
85 * AF_INET6 isn't defined, silently ignore it.
90 return (inet_net_ntop_ipv4(src, bits, dst, size));
92 #if defined(AF_INET6) && AF_INET6 != PGSQL_AF_INET6
95 return (inet_net_ntop_ipv6(src, bits, dst, size));
104 * inet_net_ntop_ipv4(src, bits, dst, size)
105 * convert IPv4 network address from network to presentation format.
106 * "src"'s size is determined from its "af".
108 * pointer to dst, or NULL if an error occurred (check errno).
110 * network byte order assumed. this means 192.5.5.240/28 has
111 * 0b11110000 in its fourth octet.
113 * Paul Vixie (ISC), October 1998
116 inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
123 if (bits < 0 || bits > 32)
129 /* Always format all four octets, regardless of mask length. */
130 for (b = len; b > 0; b--)
132 if (size <= sizeof ".255")
137 dst += SPRINTF((dst, "%u", *src++));
138 size -= (size_t) (dst - t);
141 /* don't print masklen if 32 bits */
144 if (size <= sizeof "/32")
146 dst += SPRINTF((dst, "/%u", bits));
157 decoct(const u_char *src, int bytes, char *dst, size_t size)
163 for (b = 1; b <= bytes; b++)
165 if (size <= sizeof "255.")
168 dst += SPRINTF((dst, "%u", *src++));
174 size -= (size_t) (dst - t);
180 inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
183 * Note that int32_t and int16_t need only be "at least" large enough to
184 * contain a value of the specified size. On some systems, like Crays,
185 * there is no such thing as an integer variable with 16 bits. Keep this
186 * in mind if you think this function should have been coded to use
187 * pointer overlays. All the world's not a VAX.
189 char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
196 u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
199 if ((bits < -1) || (bits > 128))
206 * Preprocess: Copy the input (bytewise) array into a wordwise array. Find
207 * the longest run of 0x00's in src[] for :: shorthanding.
209 memset(words, '\0', sizeof words);
210 for (i = 0; i < NS_IN6ADDRSZ; i++)
211 words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
216 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
221 cur.base = i, cur.len = 1;
229 if (best.base == -1 || cur.len > best.len)
237 if (best.base == -1 || cur.len > best.len)
240 if (best.base != -1 && best.len < 2)
247 for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
249 /* Are we inside the best run of 0x00's? */
250 if (best.base != -1 && i >= best.base &&
251 i < (best.base + best.len))
257 /* Are we following an initial run of 0x00s or any real hex? */
260 /* Is this address an encapsulated IPv4? */
261 if (i == 6 && best.base == 0 && (best.len == 6 ||
262 (best.len == 7 && words[7] != 0x0001) ||
263 (best.len == 5 && words[5] == 0xffff)))
267 n = decoct(src + 12, 4, tp, sizeof tmp - (tp - tmp));
276 tp += SPRINTF((tp, "%x", words[i]));
279 /* Was it a trailing run of 0x00's? */
280 if (best.base != -1 && (best.base + best.len) ==
281 (NS_IN6ADDRSZ / NS_INT16SZ))
285 if (bits != -1 && bits != 128)
286 tp += SPRINTF((tp, "/%u", bits));
289 * Check for overflow, copy, and we're done.
291 if ((size_t) (tp - tmp) > size)