diff options
Diffstat (limited to 'crypto/kerberosIV/lib/krb/resolve.c')
| -rw-r--r-- | crypto/kerberosIV/lib/krb/resolve.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/resolve.c b/crypto/kerberosIV/lib/krb/resolve.c new file mode 100644 index 0000000..7777c0e --- /dev/null +++ b/crypto/kerberosIV/lib/krb/resolve.c @@ -0,0 +1,288 @@ +/* + * Copyright (c) 1995, 1996, 1997 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the Kungliga Tekniska + * Högskolan 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 "krb_locl.h" +#include "resolve.h" + +RCSID("$Id: resolve.c,v 1.11 1997/06/01 04:19:20 assar 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; + + struct dns_reply *r; + struct resource_record **rr; + + r = (struct dns_reply*)malloc(sizeof(struct dns_reply)); + memset(r, 0, sizeof(struct dns_reply)); + + p = data; + memcpy(&r->h, p, sizeof(HEADER)); + p += sizeof(HEADER); + status = dn_expand(data, data + len, p, host, sizeof(host)); + if(status < 0){ + dns_free_data(r); + return NULL; + } + r->q.domain = strdup(host); + 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)); + (*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:{ + 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:{ + 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:{ + (*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[1024]; + int len; + int type; + struct dns_reply *r = NULL; + + type = string_to_type(type_name); + len = res_search(domain, C_IN, type, reply, sizeof(reply)); + if(len >= 0) + r = parse_reply(reply, len); + 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 |
