/* * 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. */ #include "setup.h" #include #if defined(WIN32) && !defined(WATT32) #include "nameser.h" #else #ifdef HAVE_SYS_SOCKET_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_ARPA_NAMESER_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #endif #include #include #include #include #include #include "ares_ipv6.h" #include "inet_net_pton.h" #if !defined(HAVE_INET_NET_PTON) || !defined(HAVE_INET_NET_PTON_IPV6) || \ !defined(HAVE_INET_PTON) || !defined(HAVE_INET_PTON_IPV6) /* * static int * inet_net_pton_ipv4(src, dst, size) * convert IPv4 network number from presentation to network format. * accepts hex octets, hex strings, decimal octets, and /CIDR. * "size" is in bytes and describes "dst". * return: * number of bits, either imputed classfully or specified with /CIDR, * or -1 if some failure occurred (check errno). ENOENT means it was * not an IPv4 network specification. * note: * network byte order assumed. this means 192.5.5.240/28 has * 0b11110000 in its fourth octet. * author: * Paul Vixie (ISC), June 1996 */ static int inet_net_pton_ipv4(const char *src, unsigned char *dst, size_t size) { static const char xdigits[] = "0123456789abcdef"; static const char digits[] = "0123456789"; int n, ch, tmp = 0, dirty, bits; const unsigned char *odst = dst; ch = *src++; if (ch == '0' && (src[0] == 'x' || src[0] == 'X') && isascii((unsigned char)(src[1])) && isxdigit((unsigned char)(src[1]))) { /* Hexadecimal: Eat nybble string. */ if (size <= 0U) goto emsgsize; dirty = 0; src++; /* skip x or X. */ while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch)) { if (isupper(ch)) ch = tolower(ch); n = (int)(strchr(xdigits, ch) - xdigits); if (dirty == 0) tmp = n; else tmp = (tmp << 4) | n; if (++dirty == 2) { if (size-- <= 0U) goto emsgsize; *dst++ = (unsigned char) tmp; dirty = 0; } } if (dirty) { /* Odd trailing nybble? */ if (size-- <= 0U) goto emsgsize; *dst++ = (unsigned char) (tmp << 4); } } else if (isascii(ch) && isdigit(ch)) { /* Decimal: eat dotted digit string. */ for (;;) { tmp = 0; do { n = (int)(strchr(digits, ch) - digits); tmp *= 10; tmp += n; if (tmp > 255) goto enoent; } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch)); if (size-- <= 0U) goto emsgsize; *dst++ = (unsigned char) tmp; if (ch == '\0' || ch == '/') break; if (ch != '.') goto enoent; ch = *src++; if (!isascii(ch) || !isdigit(ch)) goto enoent; } } else goto enoent; bits = -1; if (ch == '/' && isascii((unsigned char)(src[0])) && isdigit((unsigned char)(src[0])) && dst > odst) { /* CIDR width specifier. Nothing can follow it. */ ch = *src++; /* Skip over the /. */ bits = 0; do { n = (int)(strchr(digits, ch) - digits); bits *= 10; bits += n; } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch)); if (ch != '\0') goto enoent; if (bits > 32) goto emsgsize; } /* Firey death and destruction unless we prefetched EOS. */ if (ch != '\0') goto enoent; /* If nothing was written to the destination, we found no address. */ if (dst == odst) goto enoent; /* If no CIDR spec was given, infer width from net class. */ if (bits == -1) { if (*odst >= 240) /* Class E */ bits = 32; else if (*odst >= 224) /* Class D */ bits = 8; else if (*odst >= 192) /* Class C */ bits = 24; else if (*odst >= 128) /* Class B */ bits = 16; else /* Class A */ bits = 8; /* If imputed mask is narrower than specified octets, widen. */ if (bits < ((dst - odst) * 8)) bits = (int)(dst - odst) * 8; /* * If there are no additional bits specified for a class D * address adjust bits to 4. */ if (bits == 8 && *odst == 224) bits = 4; } /* Extend network to cover the actual mask. */ while (bits > ((dst - odst) * 8)) { if (size-- <= 0U) goto emsgsize; *dst++ = '\0'; } return (bits); enoent: errno = ENOENT; return (-1); emsgsize: errno = EMSGSIZE; return (-1); } static int getbits(const char *src, int *bitsp) { static const char digits[] = "0123456789"; int n; int val; char ch; val = 0; n = 0; while ((ch = *src++) != '\0') { const char *pch; pch = strchr(digits, ch); if (pch != NULL) { if (n++ != 0 && val == 0) /* no leading zeros */ return (0); val *= 10; val += (pch - digits); if (val > 128) /* range */ return (0); continue; } return (0); } if (n == 0) return (0); *bitsp = val; return (1); } static int getv4(const char *src, unsigned char *dst, int *bitsp) { static const char digits[] = "0123456789"; unsigned char *odst = dst; int n; unsigned int val; char ch; val = 0; n = 0; while ((ch = *src++) != '\0') { const char *pch; pch = strchr(digits, ch); if (pch != NULL) { if (n++ != 0 && val == 0) /* no leading zeros */ return (0); val *= 10; val += (pch - digits); if (val > 255) /* range */ return (0); continue; } if (ch == '.' || ch == '/') { if (dst - odst > 3) /* too many octets? */ return (0); *dst++ = val; if (ch == '/') return (getbits(src, bitsp)); val = 0; n = 0; continue; } return (0); } if (n == 0) return (0); if (dst - odst > 3) /* too many octets? */ return (0); *dst++ = val; return (1); } static int inet_net_pton_ipv6(const char *src, unsigned char *dst, size_t size) { 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; int digits; int bits; size_t bytes; int words; int ipv4; memset((tp = tmp), '\0', NS_IN6ADDRSZ); endp = tp + NS_IN6ADDRSZ; colonp = NULL; /* Leading :: requires some special handling. */ if (*src == ':') if (*++src != ':') goto enoent; curtok = src; saw_xdigit = 0; val = 0; digits = 0; bits = -1; ipv4 = 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 (++digits > 4) goto enoent; saw_xdigit = 1; continue; } if (ch == ':') { curtok = src; if (!saw_xdigit) { if (colonp) goto enoent; colonp = tp; continue; } else if (*src == '\0') goto enoent; if (tp + NS_INT16SZ > endp) return (0); *tp++ = (unsigned char) (val >> 8) & 0xff; *tp++ = (unsigned char) val & 0xff; saw_xdigit = 0; digits = 0; val = 0; continue; } if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && getv4(curtok, tp, &bits) > 0) { tp += NS_INADDRSZ; saw_xdigit = 0; ipv4 = 1; break; /* '\0' was seen by inet_pton4(). */ } if (ch == '/' && getbits(src, &bits) > 0) break; goto enoent; } if (saw_xdigit) { if (tp + NS_INT16SZ > endp) goto enoent; *tp++ = (unsigned char) (val >> 8) & 0xff; *tp++ = (unsigned char) val & 0xff; } if (bits == -1) bits = 128; words = (bits + 15) / 16; if (words < 2) words = 2; if (ipv4) words = 8; endp = tmp + 2 * words; if (colonp != NULL) { /* * Since some memmove()'s erroneously fail to handle * overlapping regions, we'll do the shift by hand. */ const int n = (int)(tp - colonp); int i; if (tp == endp) goto enoent; for (i = 1; i <= n; i++) { endp[- i] = colonp[n - i]; colonp[n - i] = 0; } tp = endp; } if (tp != endp) goto enoent; bytes = (bits + 7) / 8; if (bytes > size) goto emsgsize; memcpy(dst, tmp, bytes); return (bits); enoent: errno = ENOENT; return (-1); emsgsize: errno = EMSGSIZE; return (-1); } /* * int * inet_net_pton(af, src, dst, size) * convert network number from presentation to network format. * accepts hex octets, hex strings, decimal octets, and /CIDR. * "size" is in bytes and describes "dst". * return: * number of bits, either imputed classfully or specified with /CIDR, * or -1 if some failure occurred (check errno). ENOENT means it was * not a valid network specification. * author: * Paul Vixie (ISC), June 1996 */ int ares_inet_net_pton(int af, const char *src, void *dst, size_t size) { switch (af) { case AF_INET: return (inet_net_pton_ipv4(src, dst, size)); case AF_INET6: return (inet_net_pton_ipv6(src, dst, size)); default: errno = EAFNOSUPPORT; return (-1); } } #endif #if !defined(HAVE_INET_PTON) || !defined(HAVE_INET_PTON_IPV6) int ares_inet_pton(int af, const char *src, void *dst) { int size, result; if (af == AF_INET) size = sizeof(struct in_addr); else if (af == AF_INET6) size = sizeof(struct in6_addr); else { errno = EAFNOSUPPORT; return -1; } result = ares_inet_net_pton(af, src, dst, size); if (result == -1 && errno == ENOENT) return 0; return (result > -1 ? 1 : -1); } #endif