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-rw-r--r--crypto/heimdal/lib/roken/resolve.c353
1 files changed, 353 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/roken/resolve.c b/crypto/heimdal/lib/roken/resolve.c
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--- /dev/null
+++ b/crypto/heimdal/lib/roken/resolve.c
@@ -0,0 +1,353 @@
+/*
+ * Copyright (c) 1995, 1996, 1997, 1998, 1999 Kungliga Tekniska Högskolan
+ * (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. 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include "roken.h"
+#ifdef HAVE_ARPA_NAMESER_H
+#include <arpa/nameser.h>
+#endif
+#ifdef HAVE_RESOLV_H
+#include <resolv.h>
+#endif
+#include "resolve.h"
+
+RCSID("$Id: resolve.c,v 1.22 1999/12/02 16:58:52 joda Exp $");
+
+#if defined(HAVE_RES_SEARCH) && defined(HAVE_DN_EXPAND)
+
+#define DECL(X) {#X, T_##X}
+
+static struct stot{
+ const char *name;
+ int type;
+}stot[] = {
+ DECL(A),
+ DECL(NS),
+ DECL(CNAME),
+ DECL(PTR),
+ DECL(MX),
+ DECL(TXT),
+ DECL(AFSDB),
+ DECL(SRV),
+ {NULL, 0}
+};
+
+int _resolve_debug;
+
+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;
+}
+
+static const 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;
+}
+
+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;
+
+ struct dns_reply *r;
+ struct resource_record **rr;
+
+ r = calloc(1, sizeof(*r));
+ if (r == NULL)
+ return NULL;
+
+ p = data;
+#if 0
+ /* doesn't work on Crays */
+ memcpy(&r->h, p, sizeof(HEADER));
+ p += sizeof(HEADER);
+#else
+ memcpy(&r->h, p, 12); /* XXX this will probably be mostly garbage */
+ p += 12;
+#endif
+ status = dn_expand(data, data + len, p, host, sizeof(host));
+ if(status < 0){
+ dns_free_data(r);
+ return NULL;
+ }
+ r->q.domain = strdup(host);
+ if(r->q.domain == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ p += status;
+ r->q.type = (p[0] << 8 | p[1]);
+ p += 2;
+ r->q.class = (p[0] << 8 | p[1]);
+ p += 2;
+ rr = &r->head;
+ while(p < data + len){
+ 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;
+ 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;
+ *rr = (struct resource_record*)calloc(1,
+ sizeof(struct resource_record));
+ if(*rr == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ (*rr)->domain = strdup(host);
+ if((*rr)->domain == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ (*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);
+ if((*rr)->u.txt == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ break;
+ case T_MX:
+ case T_AFSDB:{
+ 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));
+ if((*rr)->u.mx == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ (*rr)->u.mx->preference = (p[0] << 8) | p[1];
+ strcpy((*rr)->u.mx->domain, host);
+ break;
+ }
+ case T_SRV:{
+ 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));
+ if((*rr)->u.srv == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ (*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:{
+ (*rr)->u.txt = (char*)malloc(size + 1);
+ if((*rr)->u.txt == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ strncpy((*rr)->u.txt, (char*)p + 1, *p);
+ (*rr)->u.txt[*p] = 0;
+ break;
+ }
+
+ default:
+ (*rr)->u.data = (unsigned char*)malloc(size);
+ if(size != 0 && (*rr)->u.data == NULL) {
+ dns_free_data(r);
+ return NULL;
+ }
+ memcpy((*rr)->u.data, p, size);
+ }
+ p += size;
+ rr = &(*rr)->next;
+ }
+ *rr = NULL;
+ return r;
+}
+
+static struct dns_reply *
+dns_lookup_int(const char *domain, int rr_class, int rr_type)
+{
+ unsigned char reply[1024];
+ int len;
+ struct dns_reply *r = NULL;
+ u_long old_options = 0;
+
+ if (_resolve_debug) {
+ old_options = _res.options;
+ _res.options |= RES_DEBUG;
+ fprintf(stderr, "dns_lookup(%s, %d, %s)\n", domain,
+ rr_class, type_to_string(rr_type));
+ }
+ len = res_search(domain, rr_class, rr_type, reply, sizeof(reply));
+ if (_resolve_debug) {
+ _res.options = old_options;
+ fprintf(stderr, "dns_lookup(%s, %d, %s) --> %d\n",
+ domain, rr_class, type_to_string(rr_type), len);
+ }
+ if (len >= 0)
+ r = parse_reply(reply, len);
+ return r;
+}
+
+struct dns_reply *
+dns_lookup(const char *domain, const char *type_name)
+{
+ int type;
+
+ type = string_to_type(type_name);
+ if(type == -1) {
+ if(_resolve_debug)
+ fprintf(stderr, "dns_lookup: unknown resource type: `%s'\n",
+ type_name);
+ return NULL;
+ }
+ return dns_lookup_int(domain, C_IN, type);
+}
+
+#else /* NOT 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->u.data);
+ break;
+ case T_A:
+ printf("%d.%d.%d.%d\n",
+ ((unsigned char*)rr->u.data)[0],
+ ((unsigned char*)rr->u.data)[1],
+ ((unsigned char*)rr->u.data)[2],
+ ((unsigned char*)rr->u.data)[3]);
+ break;
+ case T_MX:
+ case T_AFSDB:{
+ struct mx_record *mx = (struct mx_record*)rr->u.data;
+ printf("%d %s\n", mx->preference, mx->domain);
+ break;
+ }
+ case T_SRV:{
+ struct srv_record *srv = (struct srv_record*)rr->u.data;
+ printf("%d %d %d %s\n", srv->priority, srv->weight,
+ srv->port, srv->target);
+ break;
+ }
+ default:
+ printf("\n");
+ break;
+ }
+ }
+
+ return 0;
+}
+#endif
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