| /* |
| * 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. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif |
| |
| #include "netdissect-stdinc.h" |
| #include <stddef.h> |
| #include <string.h> |
| |
| #include "netdissect-ctype.h" |
| |
| #include "strtoaddr.h" |
| |
| #ifndef NS_INADDRSZ |
| #define NS_INADDRSZ 4 /* IPv4 T_A */ |
| #endif |
| |
| #ifndef NS_IN6ADDRSZ |
| #define NS_IN6ADDRSZ 16 /* IPv6 T_AAAA */ |
| #endif |
| |
| #ifndef NS_INT16SZ |
| #define NS_INT16SZ 2 /* #/bytes of data in a uint16_t */ |
| #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. |
| */ |
| |
| /* int |
| * strtoaddr(src, dst) |
| * convert presentation level IPv4 address to network order binary form. |
| * return: |
| * 1 if `src' is a valid input, else 0. |
| * notice: |
| * does not touch `dst' unless it's returning 1. |
| * author: |
| * Paul Vixie, 1996. |
| */ |
| int |
| strtoaddr(const char *src, void *dst) |
| { |
| uint32_t val; |
| u_int digit; |
| ptrdiff_t n; |
| unsigned char c; |
| u_int parts[4]; |
| u_int *pp = parts; |
| |
| c = *src; |
| for (;;) { |
| /* |
| * Collect number up to ``.''. |
| * Values are specified as for C: |
| * 0x=hex, 0=octal, isdigit=decimal. |
| */ |
| if (!ND_ASCII_ISDIGIT(c)) |
| return (0); |
| val = 0; |
| if (c == '0') { |
| c = *++src; |
| if (c == 'x' || c == 'X') |
| return (0); |
| else if (ND_ASCII_ISDIGIT(c) && c != '9') |
| return (0); |
| } |
| for (;;) { |
| if (ND_ASCII_ISDIGIT(c)) { |
| digit = c - '0'; |
| val = (val * 10) + 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' && c != ' ' && c != '\t') |
| return (0); |
| /* |
| * Find the number of parts specified. |
| * It must be 4; we only support dotted quads, we don't |
| * support shorthand. |
| */ |
| n = pp - parts + 1; |
| if (n != 4) |
| return (0); |
| /* |
| * parts[0-2] were set to the first 3 parts of the address; |
| * val was set to the 4th part. |
| * |
| * Check if any part is bigger than 255. |
| */ |
| if ((parts[0] | parts[1] | parts[2] | val) > 0xff) |
| return (0); |
| /* |
| * Add the other three parts to val. |
| */ |
| val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); |
| if (dst) { |
| val = htonl(val); |
| memcpy(dst, &val, NS_INADDRSZ); |
| } |
| return (1); |
| } |
| |
| /* int |
| * strtoaddr6(src, dst) |
| * convert presentation level IPv6 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. |
| */ |
| int |
| strtoaddr6(const char *src, void *dst) |
| { |
| static const char xdigits_l[] = "0123456789abcdef", |
| xdigits_u[] = "0123456789ABCDEF"; |
| 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 |= (int)(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) && |
| strtoaddr(curtok, tp) > 0) { |
| tp += NS_INADDRSZ; |
| seen_xdigits = 0; |
| break; /*%< '\\0' was seen by strtoaddr(). */ |
| } |
| 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 ptrdiff_t 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); |
| } |