diff options
| -rw-r--r-- | ares/CHANGES | 5 | ||||
| -rw-r--r-- | ares/Makefile.inc | 2 | ||||
| -rw-r--r-- | ares/configure.ac | 65 | ||||
| -rw-r--r-- | ares/inet_net_pton.c | 415 | ||||
| -rw-r--r-- | ares/setup.h | 11 |
5 files changed, 497 insertions, 1 deletions
diff --git a/ares/CHANGES b/ares/CHANGES index 49f4a324d..1cc64ff63 100644 --- a/ares/CHANGES +++ b/ares/CHANGES @@ -1,5 +1,10 @@ Changelog for the c-ares project +* April 5 + +- Dominick Meglio: Provided implementations of inet_net_pton and inet_pton + from BIND for systems that do not include these functions. + * March 11, 2005 - Dominick Meglio added ares_parse_aaaa_reply.c and did various diff --git a/ares/Makefile.inc b/ares/Makefile.inc index 08e213f88..6498104c7 100644 --- a/ares/Makefile.inc +++ b/ares/Makefile.inc @@ -4,7 +4,7 @@ ares_gethostbyaddr.c ares_send.c ares__read_line.c ares_gethostbyname.c \ ares_strerror.c ares_cancel.c ares_init.c ares_timeout.c ares_destroy.c \ ares_mkquery.c ares_version.c ares_expand_name.c ares_parse_a_reply.c \ windows_port.c ares_expand_string.c ares_parse_ptr_reply.c \ -ares_parse_aaaa_reply.c +ares_parse_aaaa_reply.c inet_net_pton.c HHEADERS = ares.h ares_private.h setup.h ares_dns.h ares_version.h nameser.h diff --git a/ares/configure.ac b/ares/configure.ac index ec1d3ba04..962ee20f2 100644 --- a/ares/configure.ac +++ b/ares/configure.ac @@ -120,4 +120,69 @@ CARES_CHECK_STRUCT( AC_DEFINE_UNQUOTED(HAVE_STRUCT_IN6_ADDR,1,[Define to 1 if you have struct in6_addr.]) ) +dnl check for inet_pton +AC_CHECK_FUNCS(inet_pton) +dnl Some systems have it, but not IPv6 +if test "$ac_cv_func_inet_pton" = "yes" ; then +AC_MSG_CHECKING(if inet_pton supports IPv6) +AC_TRY_RUN( + [ +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_SOCKET_H +#include <sys/socket.h> +#endif +#ifdef HAVE_WINSOCK_H +#include <winsock.h> +#endif +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +int main() + { + struct in6_addr addr6; + if (inet_pton(AF_INET6, "::1", &addr6) < 1) + exit(1); + else + exit(0); + } + ], [ + AC_MSG_RESULT(yes) + AC_DEFINE_UNQUOTED(HAVE_INET_PTON_IPV6,1,[Define to 1 if inet_pton supports IPv6.]) + ], AC_MSG_RESULT(no),AC_MSG_RESULT(no)) +fi +dnl Check for inet_net_pton +AC_CHECK_FUNCS(inet_net_pton) +dnl Again, some systems have it, but not IPv6 +if test "$ac_cv_func_inet_net_pton" = "yes" ; then +AC_MSG_CHECKING(if inet_net_pton supports IPv6) +AC_TRY_RUN( + [ +#ifdef HAVE_SYS_TYPES_H +#include <sys/types.h> +#endif +#ifdef HAVE_SYS_SOCKET_H +#include <sys/socket.h> +#endif +#ifdef HAVE_WINSOCK_H +#include <winsock.h> +#endif +#ifdef HAVE_NETINET_IN_H +#include <netinet/in.h> +#endif +int main() + { + struct in6_addr addr6; + if (inet_net_pton(AF_INET6, "::1", &addr6, sizeof(addr6)) < 1) + exit(1); + else + exit(0); + } + ], [ + AC_MSG_RESULT(yes) + AC_DEFINE_UNQUOTED(HAVE_INET_NET_PTON_IPV6,1,[Define to 1 if inet_net_pton supports IPv6.]) + ], AC_MSG_RESULT(no),AC_MSG_RESULT(no)) +fi + AC_OUTPUT(Makefile) diff --git a/ares/inet_net_pton.c b/ares/inet_net_pton.c new file mode 100644 index 000000000..b61a16c85 --- /dev/null +++ b/ares/inet_net_pton.c @@ -0,0 +1,415 @@ +/* + * 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 <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/nameser.h> +#include <arpa/inet.h> + +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.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, u_char *dst, size_t size) { + static const char xdigits[] = "0123456789abcdef"; + static const char digits[] = "0123456789"; + int n, ch, tmp = 0, dirty, bits; + const u_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 = strchr(xdigits, ch) - xdigits; + if (dirty == 0) + tmp = n; + else + tmp = (tmp << 4) | n; + if (++dirty == 2) { + if (size-- <= 0U) + goto emsgsize; + *dst++ = (u_char) tmp; + dirty = 0; + } + } + if (dirty) { /* Odd trailing nybble? */ + if (size-- <= 0U) + goto emsgsize; + *dst++ = (u_char) (tmp << 4); + } + } else if (isascii(ch) && isdigit(ch)) { + /* Decimal: eat dotted digit string. */ + for (;;) { + tmp = 0; + do { + n = 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++ = (u_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 = 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 = (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, u_char *dst, int *bitsp) { + static const char digits[] = "0123456789"; + u_char *odst = dst; + int n; + u_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, u_char *dst, size_t size) { + static const char xdigits_l[] = "0123456789abcdef", + xdigits_u[] = "0123456789ABCDEF"; + u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; + const char *xdigits, *curtok; + int ch, saw_xdigit; + u_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++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_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++ = (u_char) (val >> 8) & 0xff; + *tp++ = (u_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 = 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 diff --git a/ares/setup.h b/ares/setup.h index 3a10745c2..c3f2a8b52 100644 --- a/ares/setup.h +++ b/ares/setup.h @@ -89,4 +89,15 @@ struct in6_addr }; #endif +#if defined(HAVE_INET_PTON) && defined(HAVE_INET_PTON_IPV6) +#define ares_inet_pton(x,y,z) inet_pton(x,y,z) +#else +int ares_inet_pton(int af, const char *src, void *dst); +#endif +#if defined(HAVE_INET_NET_PTON) && defined(HAVE_INET_NET_PTON_IPV6) +#define ares_inet_net_pton(w,x,y,z) inet_net_pton(w,x,y,z) +#else +int ares_inet_net_pton(int af, const char *src, void *dst, unsigned int size); +#endif + #endif /* ARES_SETUP_H */ |