1 files changed, 291 insertions, 0 deletions

diff --git a/src/lib/libc/net/getnetnamadr.c b/src/lib/libc/net/getnetnamadr.c
new file mode 100644
index 0000000000..cc6ccc4275
--- /dev/null
+++ b/src/lib/libc/net/getnetnamadr.c
@@ -0,0 +1,291 @@
+/*      $OpenBSD: getnetnamadr.c,v 1.1 1997/03/13 19:07:27 downsj Exp $ */
+
+/* Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
+ *      Dep. Matematica Universidade de Coimbra, Portugal, Europe
+ *
+ * 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.
+ */
+/*
+ * Copyright (c) 1983, 1993
+ *      The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)getnetbyaddr.c      8.1 (Berkeley) 6/4/93";
+static char sccsid_[] = "from getnetnamadr.c    1.4 (Coimbra) 93/06/03";
+static char rcsid[] = "$From: getnetnamadr.c,v 8.7 1996/08/05 08:31:35 vixie Exp $";
+#else
+static char rcsid[] = "$OpenBSD: getnetnamadr.c,v 1.1 1997/03/13 19:07:27 downsj Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <arpa/nameser.h>
+
+#include <stdio.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <ctype.h>
+#include <errno.h>
+#include <string.h>
+
+extern int h_errno;
+
+struct netent *_getnetbyaddr __P((long net, int type));
+struct netent *_getnetbyname __P((const char *name));
+
+#define BYADDR 0
+#define BYNAME 1
+#define MAXALIASES      35
+
+#if PACKETSZ > 1024
+#define MAXPACKET       PACKETSZ
+#else
+#define MAXPACKET       1024
+#endif
+
+typedef union {
+        HEADER  hdr;
+        u_char  buf[MAXPACKET];
+} querybuf;
+
+typedef union {
+        long    al;
+        char    ac;
+} align;
+
+static struct netent *
+getnetanswer(answer, anslen, net_i)
+        querybuf *answer;
+        int anslen;
+        int net_i;
+{
+
+        register HEADER *hp;
+        register u_char *cp;
+        register int n;
+        u_char *eom;
+        int type, class, buflen, ancount, qdcount, haveanswer, i, nchar;
+        char aux1[30], aux2[30], ans[30], *in, *st, *pauxt, *bp, **ap,
+                *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
+static  struct netent net_entry;
+static  char *net_aliases[MAXALIASES], netbuf[BUFSIZ+1];
+
+        /*
+         * find first satisfactory answer
+         *
+         *      answer --> +------------+  ( MESSAGE )
+         *                 |   Header   |
+         *                 +------------+
+         *                 |  Question  | the question for the name server
+         *                 +------------+
+         *                 |   Answer   | RRs answering the question
+         *                 +------------+
+         *                 | Authority  | RRs pointing toward an authority
+         *                 | Additional | RRs holding additional information
+         *                 +------------+
+         */
+        eom = answer->buf + anslen;
+        hp = &answer->hdr;
+        ancount = ntohs(hp->ancount); /* #/records in the answer section */
+        qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
+        bp = netbuf;
+        buflen = sizeof(netbuf);
+        cp = answer->buf + HFIXEDSZ;
+        if (!qdcount) {
+                if (hp->aa)
+                        h_errno = HOST_NOT_FOUND;
+                else
+                        h_errno = TRY_AGAIN;
+                return (NULL);
+        }
+        while (qdcount-- > 0)
+                cp += __dn_skipname(cp, eom) + QFIXEDSZ;
+        ap = net_aliases;
+        *ap = NULL;
+        net_entry.n_aliases = net_aliases;
+        haveanswer = 0;
+        while (--ancount >= 0 && cp < eom) {
+                n = dn_expand(answer->buf, eom, cp, bp, buflen);
+                if ((n < 0) || !res_dnok(bp))
+                        break;
+                cp += n;
+                ans[0] = '\0';
+                (void)strcpy(&ans[0], bp);
+                GETSHORT(type, cp);
+                GETSHORT(class, cp);
+                cp += INT32SZ;          /* TTL */
+                GETSHORT(n, cp);
+                if (class == C_IN && type == T_PTR) {
+                        n = dn_expand(answer->buf, eom, cp, bp, buflen);
+                        if ((n < 0) || !res_hnok(bp)) {
+                                cp += n;
+                                return (NULL);
+                        }
+                        cp += n; 
+                        *ap++ = bp;
+                        bp += strlen(bp) + 1;
+                        net_entry.n_addrtype =
+                                (class == C_IN) ? AF_INET : AF_UNSPEC;
+                        haveanswer++;
+                }
+        }
+        if (haveanswer) {
+                *ap = NULL;
+                switch (net_i) {
+                case BYADDR:
+                        net_entry.n_name = *net_entry.n_aliases;
+                        net_entry.n_net = 0L;
+                        break;
+                case BYNAME:
+                        in = *net_entry.n_aliases;
+                        net_entry.n_name = &ans[0];
+                        aux2[0] = '\0';
+                        for (i = 0; i < 4; i++) {
+                                for (st = in, nchar = 0;
+                                     *st != '.';
+                                     st++, nchar++)
+                                        ;
+                                if (nchar != 1 || *in != '0' || flag) {
+                                        flag = 1;
+                                        (void)strncpy(paux1,
+                                                      (i==0) ? in : in-1,
+                                                      (i==0) ?nchar : nchar+1);
+                                        paux1[(i==0) ? nchar : nchar+1] = '\0';
+                                        pauxt = paux2;
+                                        paux2 = strcat(paux1, paux2);
+                                        paux1 = pauxt;
+                                }
+                                in = ++st;
+                        }                 
+                        net_entry.n_net = inet_network(paux2);
+                        break;
+                }
+                net_entry.n_aliases++;
+                return (&net_entry);
+        }
+        h_errno = TRY_AGAIN;
+        return (NULL);
+}
+
+struct netent *
+getnetbyaddr(net, net_type)
+        register u_long net;
+        register int net_type;
+{
+        unsigned int netbr[4];
+        int nn, anslen;
+        querybuf buf;
+        char qbuf[MAXDNAME];
+        unsigned long net2;
+        struct netent *net_entry;
+
+        if (net_type != AF_INET)
+                return (_getnetbyaddr(net, net_type));
+
+        for (nn = 4, net2 = net; net2; net2 >>= 8)
+                netbr[--nn] = net2 & 0xff;
+        switch (nn) {
+        case 3:         /* Class A */
+                snprintf(qbuf, sizeof(qbuf), "0.0.0.%u.in-addr.arpa", netbr[3]);
+                break;
+        case 2:         /* Class B */
+                snprintf(qbuf, sizeof(qbuf), "0.0.%u.%u.in-addr.arpa",
+                    netbr[3], netbr[2]);
+                break;
+        case 1:         /* Class C */
+                snprintf(qbuf, sizeof(qbuf), "0.%u.%u.%u.in-addr.arpa",
+                    netbr[3], netbr[2], netbr[1]);
+                break;
+        case 0:         /* Class D - E */
+                snprintf(qbuf, sizeof(qbuf), "%u.%u.%u.%u.in-addr.arpa",
+                    netbr[3], netbr[2], netbr[1], netbr[0]);
+                break;
+        }
+        anslen = res_query(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof(buf));
+        if (anslen < 0) {
+#ifdef DEBUG
+                if (_res.options & RES_DEBUG)
+                        printf("res_query failed\n");
+#endif
+                if (errno == ECONNREFUSED)
+                        return (_getnetbyaddr(net, net_type));
+                return (NULL);
+        }
+        net_entry = getnetanswer(&buf, anslen, BYADDR);
+        if (net_entry) {
+                unsigned u_net = net;   /* maybe net should be unsigned ? */
+
+                /* Strip trailing zeros */
+                while ((u_net & 0xff) == 0 && u_net != 0)
+                        u_net >>= 8;
+                net_entry->n_net = u_net;
+                return (net_entry);
+        }
+        return (_getnetbyaddr(net, net_type));
+}
+
+struct netent *
+getnetbyname(net)
+        register const char *net;
+{
+        int anslen;
+        querybuf buf;
+        char qbuf[MAXDNAME];
+        struct netent *net_entry;
+
+        if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+                h_errno = NETDB_INTERNAL;
+                return (NULL);
+        }
+        strcpy(&qbuf[0], net);
+        anslen = res_search(qbuf, C_IN, T_PTR, (u_char *)&buf, sizeof(buf));
+        if (anslen < 0) {
+#ifdef DEBUG
+                if (_res.options & RES_DEBUG)
+                        printf("res_query failed\n");
+#endif
+                if (errno == ECONNREFUSED)
+                        return (_getnetbyname(net));
+                return (_getnetbyname(net));
+        }
+        net_entry = getnetanswer(&buf, anslen, BYNAME);
+        if (net_entry)
+                return (net_entry);
+        return (_getnetbyname(net));
+}