/* $OpenBSD: inet_pton.c,v 1.5 2005/03/25 13:24:12 otto Exp $ */ /* Copyright (c) 1996 by 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE * CONSORTIUM 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) #if 0 static char rcsid[] = "$From: inet_pton.c,v 8.7 1996/08/05 08:31:35 vixie Exp $"; #else static char rcsid[] = "$OpenBSD: inet_pton.c,v 1.5 2005/03/25 13:24:12 otto Exp $"; #endif #endif /* LIBC_SCCS and not lint */ #include #include #include #include #include #include #include #include /* * 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, u_char *dst); static int inet_pton6(const char *src, u_char *dst); /* int * inet_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 inet_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, u_char *dst) { static const char digits[] = "0123456789"; int saw_digit, octets, ch; u_char tmp[INADDRSZ], *tp; saw_digit = 0; octets = 0; *(tp = tmp) = 0; while ((ch = *src++) != '\0') { const char *pch; if ((pch = strchr(digits, ch)) != NULL) { u_int new = *tp * 10 + (pch - digits); if (new > 255) return (0); if (! saw_digit) { if (++octets > 4) return (0); saw_digit = 1; } *tp = new; } 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, 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, u_char *dst) { static const char xdigits_l[] = "0123456789abcdef", xdigits_u[] = "0123456789ABCDEF"; u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp; const char *xdigits, *curtok; int ch, saw_xdigit; u_int val; memset((tp = tmp), '\0', IN6ADDRSZ); endp = tp + 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; } else if (*src == '\0') { return (0); } if (tp + INT16SZ > endp) return (0); *tp++ = (u_char) (val >> 8) & 0xff; *tp++ = (u_char) val & 0xff; saw_xdigit = 0; val = 0; continue; } if (ch == '.' && ((tp + INADDRSZ) <= endp) && inet_pton4(curtok, tp) > 0) { tp += INADDRSZ; saw_xdigit = 0; break; /* '\0' was seen by inet_pton4(). */ } return (0); } if (saw_xdigit) { if (tp + INT16SZ > endp) return (0); *tp++ = (u_char) (val >> 8) & 0xff; *tp++ = (u_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; 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, IN6ADDRSZ); return (1); }