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-rw-r--r--cpukit/libnetworking/libc/getnetbydns.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/cpukit/libnetworking/libc/getnetbydns.c b/cpukit/libnetworking/libc/getnetbydns.c
new file mode 100644
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+++ b/cpukit/libnetworking/libc/getnetbydns.c
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+/*-
+ * Copyright (c) 1985, 1988, 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.
+ * -
+ * Portions Copyright (c) 1993 by Digital Equipment Corporation.
+ *
+ * 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, and that
+ * the name of Digital Equipment Corporation not be used in advertising or
+ * publicity pertaining to distribution of the document or software without
+ * specific, written prior permission.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
+ * CORPORATION 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.
+ * -
+ * --Copyright--
+ */
+/* Portions 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
+static char rcsid[] = "$Id$";
+#endif /* LIBC_SCCS and not lint */
+
+#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>
+#include <unistd.h>
+#include <syslog.h>
+
+#include "res_config.h"
+
+extern int h_errno;
+
+#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[MAXHOSTNAMELEN], aux2[MAXHOSTNAMELEN], ans[MAXHOSTNAMELEN];
+ char *in, *st, *pauxt, *bp, **ap;
+ char *paux1 = &aux1[0], *paux2 = &aux2[0], flag = 0;
+static struct netent net_entry;
+static char *net_aliases[MAXALIASES], netbuf[PACKETSZ];
+
+ /*
+ * 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)strncpy(&ans[0], bp, sizeof(ans) - 1);
+ ans[sizeof(ans) - 1] = '\0';
+ 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 *
+_getnetbydnsaddr(net, net_type)
+ register unsigned 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 (NULL);
+
+ for (nn = 4, net2 = net; net2; net2 >>= 8)
+ netbr[--nn] = net2 & 0xff;
+ switch (nn) {
+ case 3: /* Class A */
+ sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]);
+ break;
+ case 2: /* Class B */
+ sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]);
+ break;
+ case 1: /* Class C */
+ sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
+ netbr[1]);
+ break;
+ case 0: /* Class D - E */
+ sprintf(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
+ 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 (NULL);
+}
+
+struct netent *
+_getnetbydnsname(net)
+ register const char *net;
+{
+ int anslen;
+ querybuf buf;
+ char qbuf[MAXDNAME];
+
+ if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
+ h_errno = NETDB_INTERNAL;
+ return (NULL);
+ }
+ strncpy(qbuf, net, sizeof(qbuf) - 1);
+ qbuf[sizeof(qbuf) - 1] = '\0';
+ 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
+ return (NULL);
+ }
+ return getnetanswer(&buf, anslen, BYNAME);
+}
+
+void
+_setnetdnsent(stayopen)
+ int stayopen;
+{
+ if (stayopen)
+ _res.options |= RES_STAYOPEN | RES_USEVC;
+}
+
+void
+_endnetdnsent()
+{
+ _res.options &= ~(RES_STAYOPEN | RES_USEVC);
+ res_close();
+}