Integrate BIND 4.9.5 resolver and associated routines.

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

1 files changed, 220 insertions, 0 deletions

diff --git a/src/lib/libc/net/inet_pton.c b/src/lib/libc/net/inet_pton.c
new file mode 100644
index 0000000000..8ffe81ed12
--- /dev/null
+++ b/src/lib/libc/net/inet_pton.c
@@ -0,0 +1,220 @@
+/*      $OpenBSD: inet_pton.c,v 1.1 1997/03/13 19:07:33 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 char rcsid[] = "$From: inet_pton.c,v 8.7 1996/08/05 08:31:35 vixie Exp $";
+#else
+static char rcsid[] = "$OpenBSD: inet_pton.c,v 1.1 1997/03/13 19:07:33 downsj Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#include <errno.h>
+
+/*
+ * 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 __P((const char *src, u_char *dst));
+static int      inet_pton6 __P((const char *src, u_char *dst));
+
+/* 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
+inet_pton(af, src, dst)
+        int af;
+        const char *src;
+        void *dst;
+{
+        switch (af) {
+        case AF_INET:
+                return (inet_pton4(src, dst));
+        case AF_INET6:
+                return (inet_pton6(src, dst));
+        default:
+                errno = EAFNOSUPPORT;
+                return (-1);
+        }
+        /* NOTREACHED */
+}
+
+/* int
+ * inet_pton4(src, dst)
+ *      like inet_aton() but without all the hexadecimal and shorthand.
+ * return:
+ *      1 if `src' is a valid dotted quad, else 0.
+ * notice:
+ *      does not touch `dst' unless it's returning 1.
+ * author:
+ *      Paul Vixie, 1996.
+ */
+static int
+inet_pton4(src, dst)
+        const char *src;
+        u_char *dst;
+{
+        static const char digits[] = "0123456789";
+        int saw_digit, octets, ch;
+        u_char tmp[INADDRSZ], *tp;
+
+        saw_digit = 0;
+        octets = 0;
+        *(tp = tmp) = 0;
+        while ((ch = *src++) != '\0') {
+                const char *pch;
+
+                if ((pch = strchr(digits, ch)) != NULL) {
+                        u_int new = *tp * 10 + (pch - digits);
+
+                        if (new > 255)
+                                return (0);
+                        *tp = new;
+                        if (! saw_digit) {
+                                if (++octets > 4)
+                                        return (0);
+                                saw_digit = 1;
+                        }
+                } else if (ch == '.' && saw_digit) {
+                        if (octets == 4)
+                                return (0);
+                        *++tp = 0;
+                        saw_digit = 0;
+                } else
+                        return (0);
+        }
+        if (octets < 4)
+                return (0);
+
+        memcpy(dst, tmp, INADDRSZ);
+        return (1);
+}
+
+/* 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(src, dst)
+        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;
+                        }
+                        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) > 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;
+
+                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);
+}