Integrate BIND 4.9.5 resolver and associated routines.

Includes the DNS aware getnetby*() routines and IPv6 support.

1 files changed, 207 insertions, 0 deletions

diff --git a/src/lib/libc/net/inet_net_pton.c b/src/lib/libc/net/inet_net_pton.c
new file mode 100644
index 0000000000..b529e83664
--- /dev/null
+++ b/src/lib/libc/net/inet_net_pton.c
@@ -0,0 +1,207 @@
+/*      $OpenBSD: inet_net_pton.c,v 1.1 1997/03/13 19:07:30 downsj 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static const char rcsid[] = "$From: inet_net_pton.c,v 8.3 1996/11/11 06:36:52 vixie Exp $";
+#else
+static const char rcsid[] = "$OpenBSD: inet_net_pton.c,v 1.1 1997/03/13 19:07:30 downsj Exp $";
+#endif
+#endif
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+static int      inet_net_pton_ipv4 __P((const char *src, u_char *dst,
+                                        size_t size));
+
+/*
+ * static 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
+inet_net_pton(af, src, dst, size)
+        int af;
+        const char *src;
+        void *dst;
+        size_t size;
+{
+        switch (af) {
+        case AF_INET:
+                return (inet_net_pton_ipv4(src, dst, size));
+        default:
+                errno = EAFNOSUPPORT;
+                return (-1);
+        }
+}
+
+/*
+ * 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
+ *      0x11110000 in its fourth octet.
+ * author:
+ *      Paul Vixie (ISC), June 1996
+ */
+static int
+inet_net_pton_ipv4(src, dst, size)
+        const char *src;
+        u_char *dst;
+        size_t size;
+{
+        static const char
+                xdigits[] = "0123456789abcdef",
+                digits[] = "0123456789";
+        int n, ch, tmp, dirty, bits;
+        const u_char *odst = dst;
+
+        ch = *src++;
+        if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
+            && isascii(src[1]) && isxdigit(src[1])) {
+                /* Hexadecimal: Eat nybble string. */
+                if (size <= 0)
+                        goto emsgsize;
+                *dst = 0, 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;
+                        assert(n >= 0 && n <= 15);
+                        *dst |= n;
+                        if (!dirty++)
+                                *dst <<= 4;
+                        else if (size-- > 0)
+                                *++dst = 0, dirty = 0;
+                        else
+                                goto emsgsize;
+                }
+                if (dirty)
+                        size--;
+        } else if (isascii(ch) && isdigit(ch)) {
+                /* Decimal: eat dotted digit string. */
+                for (;;) {
+                        tmp = 0;
+                        do {
+                                n = strchr(digits, ch) - digits;
+                                assert(n >= 0 && n <= 9);
+                                tmp *= 10;
+                                tmp += n;
+                                if (tmp > 255)
+                                        goto enoent;
+                        } while ((ch = *src++) != '\0' &&
+                                 isascii(ch) && isdigit(ch));
+                        if (size-- <= 0)
+                                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(src[0]) && isdigit(src[0]) && dst > odst) {
+                /* CIDR width specifier.  Nothing can follow it. */
+                ch = *src++;    /* Skip over the /. */
+                bits = 0;
+                do {
+                        n = strchr(digits, ch) - digits;
+                        assert(n >= 0 && n <= 9);
+                        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 = 4;
+                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 >= 8 && bits < ((dst - odst) * 8))
+                        bits = (dst - odst) * 8;
+        }
+        /* Extend network to cover the actual mask. */
+        while (bits > ((dst - odst) * 8)) {
+                if (size-- <= 0)
+                        goto emsgsize;
+                *dst++ = '\0';
+        }
+        return (bits);
+
+ enoent:
+        errno = ENOENT;
+        return (-1);
+
+ emsgsize:
+        errno = EMSGSIZE;
+        return (-1);
+}