Arthur de Jong

Open Source / Free Software developer

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authorArthur de Jong <arthur@arthurdejong.org>2006-10-11 15:34:15 +0200
committerArthur de Jong <arthur@arthurdejong.org>2006-10-11 15:34:15 +0200
commit6f17403298cf33747a45fb5ecbe78bf7632531f9 (patch)
treea5fc4cfdc3b091a0ee86f3c5c8d5e0ea8fc2c564 /resolve.c
import release 251 of nss-ldap
git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss_ldap-251@1 ef36b2f9-881f-0410-afb5-c4e39611909c
Diffstat (limited to 'resolve.c')
-rw-r--r--resolve.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/resolve.c b/resolve.c
new file mode 100644
index 0000000..83e7e0b
--- /dev/null
+++ b/resolve.c
@@ -0,0 +1,369 @@
+/*
+ * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Hvgskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * 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 Kungliga Tekniska
+ * Hvgskolan and its contributors.
+ *
+ * 4. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <string.h>
+#ifdef HAVE_STRINGS_H
+#include <strings.h>
+#endif
+
+#include <resolv.h>
+
+#include "resolve.h"
+
+static char rcsId[] = "$Id: resolve.c,v 2.10 2004/06/29 16:09:57 lukeh Exp $";
+
+#if defined(HAVE_RES_SEARCH) && defined(HAVE_DN_EXPAND)
+
+#define DECL(X) {#X, T_##X}
+
+static struct stot
+{
+ char *name;
+ int type;
+}
+stot[] =
+{
+ DECL (A),
+ DECL (NS),
+ DECL (CNAME), DECL (PTR), DECL (MX), DECL (TXT), DECL (AFSDB), DECL (SRV),
+ {
+ NULL, 0}
+};
+
+static int
+string_to_type (const char *name)
+{
+ struct stot *p = stot;
+ for (p = stot; p->name; p++)
+ if (strcasecmp (name, p->name) == 0)
+ return p->type;
+ return -1;
+}
+
+#if 0
+static char *
+type_to_string (int type)
+{
+ struct stot *p = stot;
+ for (p = stot; p->name; p++)
+ if (type == p->type)
+ return p->name;
+ return NULL;
+}
+#endif
+
+void
+dns_free_data (struct dns_reply *r)
+{
+ struct resource_record *rr;
+ if (r->q.domain)
+ free (r->q.domain);
+ for (rr = r->head; rr;)
+ {
+ struct resource_record *tmp = rr;
+ if (rr->domain)
+ free (rr->domain);
+ if (rr->u.data)
+ free (rr->u.data);
+ rr = rr->next;
+ free (tmp);
+ }
+ free (r);
+}
+
+static struct dns_reply *
+parse_reply (unsigned char *data, int len)
+{
+ unsigned char *p;
+ char host[128];
+ int status;
+ int query, response;
+
+ struct dns_reply *r;
+ struct resource_record **rr;
+
+ r = (struct dns_reply *) malloc (sizeof (struct dns_reply));
+ memset (r, 0, sizeof (struct dns_reply));
+ r->q.domain = NULL;
+
+ p = data;
+ memcpy (&r->h, p, sizeof (HEADER));
+ p += sizeof (HEADER);
+ for (query = 0; query < ntohs(r->h.qdcount); query++)
+ {
+ status = dn_expand (data, data + len, p, host, sizeof (host));
+ if (status < 0)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ p += status;
+ if (p + 4 > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ if (r->q.domain == NULL)
+ {
+ r->q.domain = strdup (host);
+ r->q.type = (p[0] << 8 | p[1]);
+ r->q.class = (p[2] << 8 | p[3]);
+ }
+ p += 4;
+ }
+ rr = &r->head;
+ for (response = 0; (response < ntohs(r->h.ancount)) && (p < data + len); response++)
+ {
+ unsigned int type, class, ttl, size;
+ status = dn_expand (data, data + len, p, host, sizeof (host));
+ if (status < 0)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ p += status;
+ if (p + 10 > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ type = (p[0] << 8) | p[1];
+ p += 2;
+ class = (p[0] << 8) | p[1];
+ p += 2;
+ ttl = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
+ p += 4;
+ size = (p[0] << 8) | p[1];
+ p += 2;
+ if (p + size > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ *rr = (struct resource_record *) calloc (1,
+ sizeof (struct
+ resource_record));
+ (*rr)->domain = strdup (host);
+ (*rr)->type = type;
+ (*rr)->class = class;
+ (*rr)->ttl = ttl;
+ (*rr)->size = size;
+ switch (type)
+ {
+ case T_NS:
+ case T_CNAME:
+ case T_PTR:
+ status = dn_expand (data, data + len, p, host, sizeof (host));
+ if (status < 0)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ (*rr)->u.txt = strdup (host);
+ break;
+ case T_MX:
+ case T_AFSDB:
+ {
+ if (p + 2 > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ status = dn_expand (data, data + len, p + 2, host, sizeof (host));
+ if (status < 0)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+
+ (*rr)->u.mx =
+ (struct mx_record *) malloc (sizeof (struct mx_record) +
+ strlen (host));
+ (*rr)->u.mx->preference = (p[0] << 8) | p[1];
+ strcpy ((*rr)->u.mx->domain, host);
+ break;
+ }
+ case T_SRV:
+ {
+ if (p + 6 > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ status = dn_expand (data, data + len, p + 6, host, sizeof (host));
+ if (status < 0)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ (*rr)->u.srv =
+ (struct srv_record *) malloc (sizeof (struct srv_record) +
+ strlen (host));
+ (*rr)->u.srv->priority = (p[0] << 8) | p[1];
+ (*rr)->u.srv->weight = (p[2] << 8) | p[3];
+ (*rr)->u.srv->port = (p[4] << 8) | p[5];
+ strcpy ((*rr)->u.srv->target, host);
+ break;
+ }
+ case T_TXT:
+ {
+ if (p + *p > data + len)
+ {
+ dns_free_data (r);
+ return NULL;
+ }
+ (*rr)->u.txt = (char *) malloc (size + 1);
+ strncpy ((*rr)->u.txt, (char *) p + 1, *p);
+ (*rr)->u.txt[*p] = 0;
+ break;
+ }
+
+ default:
+ (*rr)->u.data = (unsigned char *) malloc (size);
+ memcpy ((*rr)->u.data, p, size);
+ }
+ p += size;
+ rr = &(*rr)->next;
+ }
+ *rr = NULL;
+ return r;
+}
+
+
+
+struct dns_reply *
+dns_lookup (const char *domain, const char *type_name)
+{
+ unsigned char *reply = NULL;
+ int len, rlen;
+ int type;
+ struct dns_reply *r = NULL;
+
+ type = string_to_type (type_name);
+ rlen = 1024;
+ reply = malloc(rlen);
+ do
+ {
+ len = res_search (domain, C_IN, type, reply, rlen);
+ if ((len == -1) || (len < rlen))
+ {
+ break;
+ }
+ reply = realloc (reply, len + 1024);
+ rlen = len + 1024;
+ }
+ while (1);
+ if (len >= 0)
+ r = parse_reply (reply, len);
+ free(reply);
+ return r;
+}
+
+#else /* defined(HAVE_RES_SEARCH) && defined(HAVE_DN_EXPAND) */
+
+struct dns_reply *
+dns_lookup (const char *domain, const char *type_name)
+{
+ return NULL;
+}
+
+void
+dns_free_data (struct dns_reply *r)
+{
+}
+
+#endif
+
+#ifdef TEST
+
+int
+main (int argc, char **argv)
+{
+ struct dns_reply *r;
+ struct resource_record *rr;
+ r = dns_lookup (argv[1], argv[2]);
+ if (r == NULL)
+ {
+ printf ("No reply.\n");
+ return 1;
+ }
+ for (rr = r->head; rr; rr = rr->next)
+ {
+ printf ("%s %s %d ", rr->domain, type_to_string (rr->type), rr->ttl);
+ switch (rr->type)
+ {
+ case T_NS:
+ printf ("%s\n", (char *) rr->data);
+ break;
+ case T_A:
+ printf ("%d.%d.%d.%d\n",
+ ((unsigned char *) rr->data)[0],
+ ((unsigned char *) rr->data)[1],
+ ((unsigned char *) rr->data)[2],
+ ((unsigned char *) rr->data)[3]);
+ break;
+ case T_MX:
+ case T_AFSDB:
+ {
+ struct mx_record *mx = (struct mx_record *) rr->data;
+ printf ("%d %s\n", mx->preference, mx->domain);
+ break;
+ }
+ case T_SRV:
+ {
+ struct srv_record *srv = (struct srv_record *) rr->data;
+ printf ("%d %d %d %s\n", srv->priority, srv->weight,
+ srv->port, srv->target);
+ break;
+ }
+ default:
+ printf ("\n");
+ break;
+ }
+ }
+
+ return 0;
+}
+#endif