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/* Id: inet_pton.c,v 1.5 2001/04/13 15:24:35 lukem Exp */
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/* $NetBSD: inet_pton.c,v 1.16 2000/02/07 18:51:02 itojun Exp $ */
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/* Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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#include <net-snmp/net-snmp-config.h>
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#ifndef HAVE_INET_PTON
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#if HAVE_ARPA_NAMESER_H
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#include <arpa/nameser.h>
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* Net-SNMP Win32 additions
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#define EAFNOSUPPORT WSAEAFNOSUPPORT
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* End of Net-SNMP Win32 additions
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* WARNING: Don't even consider trying to compile this on a system where
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* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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static int inet_pton4(const char *src, u_char *dst, int pton);
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static int inet_pton6(const char *src, u_char *dst);
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* inet_pton(af, src, dst)
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* convert from presentation format (which usually means ASCII printable)
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* to network format (which is usually some kind of binary format).
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* 1 if the address was valid for the specified address family
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* 0 if the address wasn't valid (`dst' is untouched in this case)
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* -1 if some other error occurred (`dst' is untouched in this case, too)
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inet_pton(af, src, dst)
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return (inet_pton4(src, dst, 1));
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return (inet_pton6(src, dst));
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* inet_pton4(src, dst, pton)
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* when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand.
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* when last arg is 1: inet_pton(). decimal dotted-quad only.
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* 1 if `src' is a valid input, else 0.
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* does not touch `dst' unless it's returning 1.
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inet_pton4(src, dst, pton)
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register u_int *pp = parts;
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, isdigit=decimal.
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if (c == 'x' || c == 'X')
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base = 16, c = *++src;
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else if (isdigit(c) && c != '9')
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/* inet_pton() takes decimal only */
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if (pton && base != 10)
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val = (val * base) + digit;
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} else if (base == 16 && isxdigit(c)) {
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digit = c + 10 - (islower(c) ? 'a' : 'A');
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val = (val << 4) | digit;
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* a.b.c (with c treated as 16 bits)
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* a.b (with b treated as 24 bits)
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* a (with a treated as 32 bits)
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* Check for trailing characters.
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if (c != '\0' && !isspace(c))
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* Concoct the address according to
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* the number of parts specified.
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/* inet_pton() takes dotted-quad only. it does not take shorthand. */
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return (0); /* initial nondigit */
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case 1: /* a -- 32 bits */
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case 2: /* a.b -- 8.24 bits */
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if (parts[0] > 0xff || val > 0xffffff)
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val |= parts[0] << 24;
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case 3: /* a.b.c -- 8.8.16 bits */
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if ((parts[0] | parts[1]) > 0xff || val > 0xffff)
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val |= (parts[0] << 24) | (parts[1] << 16);
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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memcpy(dst, &val, INADDRSZ);
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* inet_pton6(src, dst)
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* convert presentation level address to network order binary form.
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* 1 if `src' is a valid [RFC1884 2.2] address, else 0.
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* (1) does not touch `dst' unless it's returning 1.
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* (2) :: in a full address is silently ignored.
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* inspired by Mark Andrews.
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static const char xdigits_l[] = "0123456789abcdef",
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xdigits_u[] = "0123456789ABCDEF";
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u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
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const char *xdigits, *curtok;
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memset((tp = tmp), '\0', IN6ADDRSZ);
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endp = tp + IN6ADDRSZ;
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/* Leading :: requires some special handling. */
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while ((ch = *src++) != '\0') {
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if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
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pch = strchr((xdigits = xdigits_u), ch);
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val |= (pch - xdigits);
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} else if (*src == '\0')
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if (tp + INT16SZ > endp)
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*tp++ = (u_char) (val >> 8) & 0xff;
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*tp++ = (u_char) val & 0xff;
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if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
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inet_pton4(curtok, tp, 1) > 0) {
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break; /* '\0' was seen by inet_pton4(). */
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if (tp + INT16SZ > endp)
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*tp++ = (u_char) (val >> 8) & 0xff;
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*tp++ = (u_char) val & 0xff;
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if (colonp != NULL) {
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* Since some memmove()'s erroneously fail to handle
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* overlapping regions, we'll do the shift by hand.
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const int n = tp - colonp;
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for (i = 1; i <= n; i++) {
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endp[- i] = colonp[n - i];
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memcpy(dst, tmp, IN6ADDRSZ);
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#endif /* HAVE_INET_PTON */
added
removed
snmplib/inet_pton.c
