diff options
Diffstat (limited to 'sys/libkern/inet_pton.c')
-rw-r--r-- | sys/libkern/inet_pton.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/sys/libkern/inet_pton.c b/sys/libkern/inet_pton.c new file mode 100644 index 0000000..f8b7293 --- /dev/null +++ b/sys/libkern/inet_pton.c @@ -0,0 +1,219 @@ +/* + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1996,1999 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 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 const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/systm.h> + +#include <netinet/in.h> + +#if __FreeBSD_version < 700000 +#define strchr index +#endif + +/*% + * 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: + 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; +#define NS_INADDRSZ 4 + u_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) { + u_int new = *tp * 10 + (pch - digits); + + if (saw_digit && *tp == 0) + return (0); + if (new > 255) + return (0); + *tp = 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, u_char *dst) +{ + static const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; +#define NS_IN6ADDRSZ 16 +#define NS_INT16SZ 2 + u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, seen_xdigits; + u_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; + seen_xdigits = 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 (++seen_xdigits > 4) + return (0); + continue; + } + if (ch == ':') { + curtok = src; + if (!seen_xdigits) { + if (colonp) + return (0); + colonp = tp; + continue; + } else if (*src == '\0') { + return (0); + } + if (tp + NS_INT16SZ > endp) + return (0); + *tp++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_char) val & 0xff; + seen_xdigits = 0; + val = 0; + continue; + } + if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && + inet_pton4(curtok, tp) > 0) { + tp += NS_INADDRSZ; + seen_xdigits = 0; + break; /*%< '\\0' was seen by inet_pton4(). */ + } + return (0); + } + if (seen_xdigits) { + if (tp + NS_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; + + 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); +} + +/*! \file */ |