Line data Source code
1 : /*
2 : * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 : * Copyright (c) 1996,1999 by Internet Software Consortium.
4 : *
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.
8 : *
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.
16 : *
17 : * src/port/inet_net_ntop.c
18 : */
19 :
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 $";
22 : #endif
23 :
24 : #ifndef FRONTEND
25 : #include "postgres.h"
26 : #else
27 : #include "postgres_fe.h"
28 : #endif
29 :
30 : #include <sys/socket.h>
31 : #include <netinet/in.h>
32 : #include <arpa/inet.h>
33 :
34 : #ifndef FRONTEND
35 : #include "utils/inet.h"
36 : #else
37 : /*
38 : * In a frontend build, we can't include inet.h, but we still need to have
39 : * sensible definitions of these two constants. Note that pg_inet_net_ntop()
40 : * assumes that PGSQL_AF_INET is equal to AF_INET.
41 : */
42 : #define PGSQL_AF_INET (AF_INET + 0)
43 : #define PGSQL_AF_INET6 (AF_INET + 1)
44 : #endif
45 :
46 :
47 : #define NS_IN6ADDRSZ 16
48 : #define NS_INT16SZ 2
49 :
50 : #ifdef SPRINTF_CHAR
51 : #define SPRINTF(x) strlen(sprintf/**/x)
52 : #else
53 : #define SPRINTF(x) ((size_t)sprintf x)
54 : #endif
55 :
56 : static char *inet_net_ntop_ipv4(const u_char *src, int bits,
57 : char *dst, size_t size);
58 : static char *inet_net_ntop_ipv6(const u_char *src, int bits,
59 : char *dst, size_t size);
60 :
61 :
62 : /*
63 : * char *
64 : * pg_inet_net_ntop(af, src, bits, dst, size)
65 : * convert host/network address from network to presentation format.
66 : * "src"'s size is determined from its "af".
67 : * return:
68 : * pointer to dst, or NULL if an error occurred (check errno).
69 : * note:
70 : * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
71 : * as called for by pg_inet_net_pton() but it can be a host address with
72 : * an included netmask.
73 : * author:
74 : * Paul Vixie (ISC), October 1998
75 : */
76 : char *
77 8986 : pg_inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
78 : {
79 : /*
80 : * We need to cover both the address family constants used by the PG inet
81 : * type (PGSQL_AF_INET and PGSQL_AF_INET6) and those used by the system
82 : * libraries (AF_INET and AF_INET6). We can safely assume PGSQL_AF_INET
83 : * == AF_INET, but the INET6 constants are very likely to be different.
84 : */
85 8986 : switch (af)
86 : {
87 7137 : case PGSQL_AF_INET:
88 7137 : return (inet_net_ntop_ipv4(src, bits, dst, size));
89 1849 : case PGSQL_AF_INET6:
90 : #if AF_INET6 != PGSQL_AF_INET6
91 : case AF_INET6:
92 : #endif
93 1849 : return (inet_net_ntop_ipv6(src, bits, dst, size));
94 0 : default:
95 0 : errno = EAFNOSUPPORT;
96 0 : return (NULL);
97 : }
98 : }
99 :
100 : /*
101 : * static char *
102 : * inet_net_ntop_ipv4(src, bits, dst, size)
103 : * convert IPv4 network address from network to presentation format.
104 : * "src"'s size is determined from its "af".
105 : * return:
106 : * pointer to dst, or NULL if an error occurred (check errno).
107 : * note:
108 : * network byte order assumed. this means 192.5.5.240/28 has
109 : * 0b11110000 in its fourth octet.
110 : * author:
111 : * Paul Vixie (ISC), October 1998
112 : */
113 : static char *
114 7137 : inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
115 : {
116 7137 : char *odst = dst;
117 : char *t;
118 7137 : int len = 4;
119 : int b;
120 :
121 7137 : if (bits < 0 || bits > 32)
122 : {
123 0 : errno = EINVAL;
124 0 : return (NULL);
125 : }
126 :
127 : /* Always format all four octets, regardless of mask length. */
128 35685 : for (b = len; b > 0; b--)
129 : {
130 28548 : if (size <= sizeof ".255")
131 0 : goto emsgsize;
132 28548 : t = dst;
133 28548 : if (dst != odst)
134 21411 : *dst++ = '.';
135 28548 : dst += SPRINTF((dst, "%u", *src++));
136 28548 : size -= (size_t) (dst - t);
137 : }
138 :
139 : /* don't print masklen if 32 bits */
140 7137 : if (bits != 32)
141 : {
142 5743 : if (size <= sizeof "/32")
143 0 : goto emsgsize;
144 5743 : dst += SPRINTF((dst, "/%u", bits));
145 : }
146 :
147 7137 : return (odst);
148 :
149 0 : emsgsize:
150 0 : errno = EMSGSIZE;
151 0 : return (NULL);
152 : }
153 :
154 : static int
155 176 : decoct(const u_char *src, int bytes, char *dst, size_t size)
156 : {
157 176 : char *odst = dst;
158 : char *t;
159 : int b;
160 :
161 880 : for (b = 1; b <= bytes; b++)
162 : {
163 704 : if (size <= sizeof "255.")
164 0 : return (0);
165 704 : t = dst;
166 704 : dst += SPRINTF((dst, "%u", *src++));
167 704 : if (b != bytes)
168 : {
169 528 : *dst++ = '.';
170 528 : *dst = '\0';
171 : }
172 704 : size -= (size_t) (dst - t);
173 : }
174 176 : return (dst - odst);
175 : }
176 :
177 : static char *
178 1849 : inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
179 : {
180 : /*
181 : * Note that int32_t and int16_t need only be "at least" large enough to
182 : * contain a value of the specified size. On some systems, like Crays,
183 : * there is no such thing as an integer variable with 16 bits. Keep this
184 : * in mind if you think this function should have been coded to use
185 : * pointer overlays. All the world's not a VAX.
186 : */
187 : char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
188 : char *tp;
189 : struct
190 : {
191 : int base,
192 : len;
193 : } best, cur;
194 : u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
195 : int i;
196 :
197 1849 : if ((bits < -1) || (bits > 128))
198 : {
199 0 : errno = EINVAL;
200 0 : return (NULL);
201 : }
202 :
203 : /*
204 : * Preprocess: Copy the input (bytewise) array into a wordwise array. Find
205 : * the longest run of 0x00's in src[] for :: shorthanding.
206 : */
207 1849 : memset(words, '\0', sizeof words);
208 31433 : for (i = 0; i < NS_IN6ADDRSZ; i++)
209 29584 : words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
210 1849 : best.base = -1;
211 1849 : cur.base = -1;
212 1849 : best.len = 0;
213 1849 : cur.len = 0;
214 16641 : for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
215 : {
216 14792 : if (words[i] == 0)
217 : {
218 7469 : if (cur.base == -1)
219 1763 : cur.base = i, cur.len = 1;
220 : else
221 5706 : cur.len++;
222 : }
223 : else
224 : {
225 7323 : if (cur.base != -1)
226 : {
227 1663 : if (best.base == -1 || cur.len > best.len)
228 1663 : best = cur;
229 1663 : cur.base = -1;
230 : }
231 : }
232 : }
233 1849 : if (cur.base != -1)
234 : {
235 100 : if (best.base == -1 || cur.len > best.len)
236 97 : best = cur;
237 : }
238 1849 : if (best.base != -1 && best.len < 2)
239 12 : best.base = -1;
240 :
241 : /*
242 : * Format the result.
243 : */
244 1849 : tp = tmp;
245 16289 : for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
246 : {
247 : /* Are we inside the best run of 0x00's? */
248 14616 : if (best.base != -1 && i >= best.base &&
249 11995 : i < (best.base + best.len))
250 : {
251 7454 : if (i == best.base)
252 1748 : *tp++ = ':';
253 7454 : continue;
254 : }
255 : /* Are we following an initial run of 0x00s or any real hex? */
256 7162 : if (i != 0)
257 5676 : *tp++ = ':';
258 : /* Is this address an encapsulated IPv4? */
259 7162 : if (i == 6 && best.base == 0 && (best.len == 6 ||
260 91 : (best.len == 7 && words[7] != 0x0001) ||
261 91 : (best.len == 5 && words[5] == 0xffff)))
262 : {
263 : int n;
264 :
265 176 : n = decoct(src + 12, 4, tp, sizeof tmp - (tp - tmp));
266 176 : if (n == 0)
267 : {
268 0 : errno = EMSGSIZE;
269 0 : return (NULL);
270 : }
271 176 : tp += strlen(tp);
272 176 : break;
273 : }
274 6986 : tp += SPRINTF((tp, "%x", words[i]));
275 : }
276 :
277 : /* Was it a trailing run of 0x00's? */
278 1849 : if (best.base != -1 && (best.base + best.len) ==
279 : (NS_IN6ADDRSZ / NS_INT16SZ))
280 91 : *tp++ = ':';
281 1849 : *tp = '\0';
282 :
283 1849 : if (bits != -1 && bits != 128)
284 454 : tp += SPRINTF((tp, "/%u", bits));
285 :
286 : /*
287 : * Check for overflow, copy, and we're done.
288 : */
289 1849 : if ((size_t) (tp - tmp) > size)
290 : {
291 0 : errno = EMSGSIZE;
292 0 : return (NULL);
293 : }
294 1849 : strcpy(dst, tmp);
295 1849 : return (dst);
296 : }
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