| /* Id: inet_pton.c,v 1.5 2001/04/13 15:24:35 lukem Exp */ |
| /* $NetBSD: inet_pton.c,v 1.16 2000/02/07 18:51:02 itojun 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. |
| */ |
| |
| #include <net-snmp/net-snmp-config.h> |
| |
| #include <ctype.h> |
| |
| #if HAVE_ARPA_NAMESER_H |
| #include <arpa/nameser.h> |
| #endif |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #if HAVE_STRING_H |
| #include <string.h> |
| #else |
| #include <strings.h> |
| #endif |
| |
| #include <net-snmp/types.h> |
| #include "inet_pton.h" |
| |
| #ifndef EAFNOSUPPORT |
| #define EAFNOSUPPORT WSAEAFNOSUPPORT |
| #endif |
| |
| #ifndef IN6ADDRSZ |
| #define IN6ADDRSZ 16 |
| #endif |
| |
| #ifndef INT16SZ |
| #define INT16SZ 2 |
| #endif |
| |
| #ifndef INADDRSZ |
| #define INADDRSZ 4 |
| #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, int pton); |
| #ifdef NETSNMP_ENABLE_IPV6 |
| static int inet_pton6(const char *src, u_char *dst); |
| #endif |
| |
| /* 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 |
| netsnmp_inet_pton(int af, const char *src, void *dst) |
| { |
| |
| switch (af) { |
| case AF_INET: |
| return (inet_pton4(src, dst, 1)); |
| #ifdef NETSNMP_ENABLE_IPV6 |
| case AF_INET6: |
| return (inet_pton6(src, dst)); |
| #endif |
| default: |
| errno = EAFNOSUPPORT; |
| return (-1); |
| } |
| /* NOTREACHED */ |
| } |
| |
| /* int |
| * inet_pton4(src, dst, pton) |
| * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand. |
| * when last arg is 1: inet_pton(). decimal dotted-quad only. |
| * return: |
| * 1 if `src' is a valid input, 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, int pton) |
| { |
| u_int val; |
| u_int digit; |
| int base, n; |
| unsigned char c; |
| u_int parts[4]; |
| register u_int *pp = parts; |
| |
| c = *src; |
| for (;;) { |
| /* |
| * Collect number up to ``.''. |
| * Values are specified as for C: |
| * 0x=hex, 0=octal, isdigit=decimal. |
| */ |
| if (!isdigit(c)) |
| return (0); |
| val = 0; base = 10; |
| if (c == '0') { |
| c = *++src; |
| if (c == 'x' || c == 'X') |
| base = 16, c = *++src; |
| else if (isdigit(c) && c != '9') |
| base = 8; |
| } |
| /* inet_pton() takes decimal only */ |
| if (pton && base != 10) |
| return (0); |
| for (;;) { |
| if (isdigit(c)) { |
| digit = c - '0'; |
| if ((int)digit >= base) |
| break; |
| val = (val * base) + digit; |
| c = *++src; |
| } else if (base == 16 && isxdigit(c)) { |
| digit = c + 10 - (islower(c) ? 'a' : 'A'); |
| if (digit >= 16) |
| break; |
| val = (val << 4) | digit; |
| c = *++src; |
| } else |
| break; |
| } |
| if (c == '.') { |
| /* |
| * Internet format: |
| * a.b.c.d |
| * a.b.c (with c treated as 16 bits) |
| * a.b (with b treated as 24 bits) |
| * a (with a treated as 32 bits) |
| */ |
| if (pp >= parts + 3) |
| return (0); |
| *pp++ = val; |
| c = *++src; |
| } else |
| break; |
| } |
| /* |
| * Check for trailing characters. |
| */ |
| if (c != '\0' && !isspace(c)) |
| return (0); |
| /* |
| * Concoct the address according to |
| * the number of parts specified. |
| */ |
| n = pp - parts + 1; |
| /* inet_pton() takes dotted-quad only. it does not take shorthand. */ |
| if (pton && n != 4) |
| return (0); |
| switch (n) { |
| |
| case 0: |
| return (0); /* initial nondigit */ |
| |
| case 1: /* a -- 32 bits */ |
| break; |
| |
| case 2: /* a.b -- 8.24 bits */ |
| if (parts[0] > 0xff || val > 0xffffff) |
| return (0); |
| val |= parts[0] << 24; |
| break; |
| |
| case 3: /* a.b.c -- 8.8.16 bits */ |
| if ((parts[0] | parts[1]) > 0xff || val > 0xffff) |
| return (0); |
| val |= (parts[0] << 24) | (parts[1] << 16); |
| break; |
| |
| case 4: /* a.b.c.d -- 8.8.8.8 bits */ |
| if ((parts[0] | parts[1] | parts[2] | val) > 0xff) |
| return (0); |
| val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); |
| break; |
| } |
| if (dst) { |
| val = htonl(val); |
| memcpy(dst, &val, INADDRSZ); |
| } |
| return (1); |
| } |
| |
| #ifdef NETSNMP_ENABLE_IPV6 |
| /* 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, 1) > 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; |
| |
| 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, IN6ADDRSZ); |
| return (1); |
| } |
| #endif |