/* * Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1996-2003 Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #if defined(LIBC_SCCS) && !defined(lint) static char rcsid[] = "$Id: inet_pton.c,v 1.10.2.4.2.1 2004/03/06 08:14:31 marka Exp $"; #endif /* LIBC_SCCS and not lint */ #include #include #include #include #define NS_INT16SZ 2 #define NS_INADDRSZ 4 #define NS_IN6ADDRSZ 16 /* * WARNING: Don't even consider trying to compile this on a system where * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. */ static int inet_pton4(const char *src, unsigned char *dst); static int inet_pton6(const char *src, unsigned char *dst); /* int * isc_net_pton(af, src, dst) * convert from presentation format (which usually means ASCII printable) * to network format (which is usually some kind of binary format). * return: * 1 if the address was valid for the specified address family * 0 if the address wasn't valid (`dst' is untouched in this case) * -1 if some other error occurred (`dst' is untouched in this case, too) * author: * Paul Vixie, 1996. */ int isc_net_pton(int af, const char *src, void *dst) { switch (af) { case AF_INET: return (inet_pton4(src, dst)); case AF_INET6: return (inet_pton6(src, dst)); default: errno = EAFNOSUPPORT; return (-1); } /* NOTREACHED */ } /* int * inet_pton4(src, dst) * like inet_aton() but without all the hexadecimal and shorthand. * return: * 1 if `src' is a valid dotted quad, else 0. * notice: * does not touch `dst' unless it's returning 1. * author: * Paul Vixie, 1996. */ static int inet_pton4(const char *src, unsigned char *dst) { static const char digits[] = "0123456789"; int saw_digit, octets, ch; unsigned char tmp[NS_INADDRSZ], *tp; saw_digit = 0; octets = 0; *(tp = tmp) = 0; while ((ch = *src++) != '\0') { const char *pch; if ((pch = strchr(digits, ch)) != NULL) { unsigned int new = *tp * 10 + (pch - digits); if (saw_digit && *tp == 0) return (0); if (new > 255) return (0); *tp = (unsigned char) new; if (!saw_digit) { if (++octets > 4) return (0); saw_digit = 1; } } else if (ch == '.' && saw_digit) { if (octets == 4) return (0); *++tp = 0; saw_digit = 0; } else return (0); } if (octets < 4) return (0); memcpy(dst, tmp, NS_INADDRSZ); return (1); } /* int * inet_pton6(src, dst) * convert presentation level address to network order binary form. * return: * 1 if `src' is a valid [RFC1884 2.2] address, else 0. * notice: * (1) does not touch `dst' unless it's returning 1. * (2) :: in a full address is silently ignored. * credit: * inspired by Mark Andrews. * author: * Paul Vixie, 1996. */ static int inet_pton6(const char *src, unsigned char *dst) { static const char xdigits_l[] = "0123456789abcdef", xdigits_u[] = "0123456789ABCDEF"; unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; const char *xdigits, *curtok; int ch, saw_xdigit; unsigned int val; memset((tp = tmp), '\0', NS_IN6ADDRSZ); endp = tp + NS_IN6ADDRSZ; colonp = NULL; /* Leading :: requires some special handling. */ if (*src == ':') if (*++src != ':') return (0); curtok = src; saw_xdigit = 0; val = 0; while ((ch = *src++) != '\0') { const char *pch; if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) pch = strchr((xdigits = xdigits_u), ch); if (pch != NULL) { val <<= 4; val |= (pch - xdigits); if (val > 0xffff) return (0); saw_xdigit = 1; continue; } if (ch == ':') { curtok = src; if (!saw_xdigit) { if (colonp) return (0); colonp = tp; continue; } if (tp + NS_INT16SZ > endp) return (0); *tp++ = (unsigned char) ((val >> 8) & 0xff); *tp++ = (unsigned char) (val & 0xff); saw_xdigit = 0; val = 0; continue; } if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && inet_pton4(curtok, tp) > 0) { tp += NS_INADDRSZ; saw_xdigit = 0; break; /* '\0' was seen by inet_pton4(). */ } return (0); } if (saw_xdigit) { if (tp + NS_INT16SZ > endp) return (0); *tp++ = (unsigned char) ((val >> 8) & 0xff); *tp++ = (unsigned char) (val & 0xff); } if (colonp != NULL) { /* * Since some memmove()'s erroneously fail to handle * overlapping regions, we'll do the shift by hand. */ const int n = tp - colonp; int i; if (tp == endp) return (0); for (i = 1; i <= n; i++) { endp[- i] = colonp[n - i]; colonp[n - i] = 0; } tp = endp; } if (tp != endp) return (0); memcpy(dst, tmp, NS_IN6ADDRSZ); return (1); }