2 * Copyright (c) 1996 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 * $PostgreSQL: pgsql/src/backend/utils/adt/inet_net_pton.c,v 1.19 2004/10/07 15:21:53 momjian Exp $
22 #include <sys/socket.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
30 #include "utils/inet.h"
32 #include "utils/builtins.h"
34 static int inet_net_pton_ipv4(const char *src, u_char *dst);
35 static int inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size);
36 static int inet_net_pton_ipv6(const char *src, u_char *dst);
37 static int inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size);
41 * inet_net_pton(af, src, dst, size)
42 * convert network number from presentation to network format.
43 * accepts hex octets, hex strings, decimal octets, and /CIDR.
44 * "size" is in bytes and describes "dst".
46 * number of bits, either imputed classfully or specified with /CIDR,
47 * or -1 if some failure occurred (check errno). ENOENT means it was
48 * not a valid network specification.
50 * Paul Vixie (ISC), June 1996
53 * I added the inet_cidr_pton function (also from Paul) and changed
54 * the names to reflect their current use.
58 inet_net_pton(int af, const char *src, void *dst, size_t size)
64 inet_net_pton_ipv4(src, dst) :
65 inet_cidr_pton_ipv4(src, dst, size);
68 inet_net_pton_ipv6(src, dst) :
69 inet_cidr_pton_ipv6(src, dst, size);
78 * inet_cidr_pton_ipv4(src, dst, size)
79 * convert IPv4 network number from presentation to network format.
80 * accepts hex octets, hex strings, decimal octets, and /CIDR.
81 * "size" is in bytes and describes "dst".
83 * number of bits, either imputed classfully or specified with /CIDR,
84 * or -1 if some failure occurred (check errno). ENOENT means it was
85 * not an IPv4 network specification.
87 * network byte order assumed. this means 192.5.5.240/28 has
88 * 0x11110000 in its fourth octet.
90 * Paul Vixie (ISC), June 1996
93 inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size)
96 xdigits[] = "0123456789abcdef",
97 digits[] = "0123456789";
103 const u_char *odst = dst;
106 if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
107 && isxdigit((unsigned char) src[1]))
109 /* Hexadecimal: Eat nybble string. */
114 src++; /* skip x or X. */
115 while ((ch = *src++) != '\0' && isxdigit((unsigned char) ch))
117 if (isupper((unsigned char) ch))
118 ch = tolower((unsigned char) ch);
119 n = strchr(xdigits, ch) - xdigits;
120 assert(n >= 0 && n <= 15);
124 tmp = (tmp << 4) | n;
129 *dst++ = (u_char) tmp;
134 { /* Odd trailing nybble? */
137 *dst++ = (u_char) (tmp << 4);
140 else if (isdigit((unsigned char) ch))
142 /* Decimal: eat dotted digit string. */
148 n = strchr(digits, ch) - digits;
149 assert(n >= 0 && n <= 9);
154 } while ((ch = *src++) != '\0' &&
155 isdigit((unsigned char) ch));
158 *dst++ = (u_char) tmp;
159 if (ch == '\0' || ch == '/')
164 if (!isdigit((unsigned char) ch))
172 if (ch == '/' && isdigit((unsigned char) src[0]) && dst > odst)
174 /* CIDR width specifier. Nothing can follow it. */
175 ch = *src++; /* Skip over the /. */
179 n = strchr(digits, ch) - digits;
180 assert(n >= 0 && n <= 9);
183 } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
190 /* Firey death and destruction unless we prefetched EOS. */
194 /* If nothing was written to the destination, we found no address. */
197 /* If no CIDR spec was given, infer width from net class. */
200 if (*odst >= 240) /* Class E */
202 else if (*odst >= 224) /* Class D */
204 else if (*odst >= 192) /* Class C */
206 else if (*odst >= 128) /* Class B */
211 /* If imputed mask is narrower than specified octets, widen. */
212 if (bits >= 8 && bits < ((dst - odst) * 8))
213 bits = (dst - odst) * 8;
215 /* Extend network to cover the actual mask. */
216 while (bits > ((dst - odst) * 8))
235 * inet_net_pton(af, src, dst, *bits)
236 * convert network address from presentation to network format.
237 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
238 * "dst" is assumed large enough for its "af". "bits" is set to the
239 * /CIDR prefix length, which can have defaults (like /32 for IPv4).
241 * -1 if an error occurred (inspect errno; ENOENT means bad format).
242 * 0 if successful conversion occurred.
244 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
245 * as called for by inet_cidr_pton() but it can be a host address with
246 * an included netmask.
248 * Paul Vixie (ISC), October 1998
251 inet_net_pton_ipv4(const char *src, u_char *dst)
253 static const char digits[] = "0123456789";
254 const u_char *odst = dst;
261 /* Get the mantissa. */
262 while (ch = *src++, isdigit((unsigned char) ch))
267 n = strchr(digits, ch) - digits;
268 assert(n >= 0 && n <= 9);
273 } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
276 *dst++ = (u_char) tmp;
277 if (ch == '\0' || ch == '/')
283 /* Get the prefix length if any. */
285 if (ch == '/' && isdigit((unsigned char) src[0]) && dst > odst)
287 /* CIDR width specifier. Nothing can follow it. */
288 ch = *src++; /* Skip over the /. */
292 n = strchr(digits, ch) - digits;
293 assert(n >= 0 && n <= 9);
296 } while ((ch = *src++) != '\0' && isdigit((unsigned char) ch));
303 /* Firey death and destruction unless we prefetched EOS. */
307 /* Prefix length can default to /32 only if all four octets spec'd. */
316 /* If nothing was written to the destination, we found no address. */
320 /* If prefix length overspecifies mantissa, life is bad. */
321 if ((bits / 8) > (dst - odst))
324 /* Extend address to four octets. */
340 getbits(const char *src, int *bitsp)
342 static const char digits[] = "0123456789";
349 while ((ch = *src++) != '\0')
353 pch = strchr(digits, ch);
356 if (n++ != 0 && val == 0) /* no leading zeros */
359 val += (pch - digits);
360 if (val > 128) /* range */
373 getv4(const char *src, u_char *dst, int *bitsp)
375 static const char digits[] = "0123456789";
383 while ((ch = *src++) != '\0')
387 pch = strchr(digits, ch);
390 if (n++ != 0 && val == 0) /* no leading zeros */
393 val += (pch - digits);
394 if (val > 255) /* range */
398 if (ch == '.' || ch == '/')
400 if (dst - odst > 3) /* too many octets? */
404 return (getbits(src, bitsp));
413 if (dst - odst > 3) /* too many octets? */
420 inet_net_pton_ipv6(const char *src, u_char *dst)
422 return inet_cidr_pton_ipv6(src, dst, 16);
425 #define NS_IN6ADDRSZ 16
427 #define NS_INADDRSZ 4
430 inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size)
432 static const char xdigits_l[] = "0123456789abcdef",
433 xdigits_u[] = "0123456789ABCDEF";
434 u_char tmp[NS_IN6ADDRSZ],
446 if (size < NS_IN6ADDRSZ)
449 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
450 endp = tp + NS_IN6ADDRSZ;
452 /* Leading :: requires some special handling. */
461 while ((ch = *src++) != '\0')
465 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
466 pch = strchr((xdigits = xdigits_u), ch);
470 val |= (pch - xdigits);
486 else if (*src == '\0')
488 if (tp + NS_INT16SZ > endp)
490 *tp++ = (u_char) (val >> 8) & 0xff;
491 *tp++ = (u_char) val & 0xff;
497 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
498 getv4(curtok, tp, &bits) > 0)
502 break; /* '\0' was seen by inet_pton4(). */
504 if (ch == '/' && getbits(src, &bits) > 0)
510 if (tp + NS_INT16SZ > endp)
512 *tp++ = (u_char) (val >> 8) & 0xff;
513 *tp++ = (u_char) val & 0xff;
523 * Since some memmove()'s erroneously fail to handle overlapping
524 * regions, we'll do the shift by hand.
526 const int n = tp - colonp;
531 for (i = 1; i <= n; i++)
533 endp[-i] = colonp[n - i];
542 * Copy out the result.
544 memcpy(dst, tmp, NS_IN6ADDRSZ);