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#include <openssl/opensslconf.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <openssl/bio.h>
#include <openssl/dso.h>
#include "ssl.h"
#ifndef OPENSSL_NO_LIBUNBOUND
#include <unbound.h>
static struct ub_ctx *ctx = NULL;
static DSO *unbound_dso = NULL;
static union {
void *p; struct ub_ctx *(*f)(); }
p_ub_ctx_create = {NULL};
static union {
void *p; int (*f)(struct ub_ctx *,const char *); }
p_ub_ctx_resolvconf = {NULL};
static union {
void *p; int (*f)(struct ub_ctx *,const char *); }
p_ub_ctx_add_ta_file = {NULL};
static union {
void *p; void (*f)(struct ub_ctx *); }
p_ub_ctx_delete = {NULL};
static union {
void *p; int (*f)(struct ub_ctx *,const char *,int,int,struct ub_result**); }
p_ub_resolve = {NULL};
static union {
void *p; void (*f)(struct ub_result*); }
p_ub_resolve_free = {NULL};
#if defined(__GNUC__) && __GNUC__>=2
static void unbound_init(void) __attribute__((constructor));
static void unbound_fini(void) __attribute__((destructor));
#endif
static void unbound_init(void)
{
DSO *dso;
if ((dso = DSO_load(NULL, "unbound", NULL, 0)) == NULL) return;
if ((p_ub_ctx_create.p = DSO_bind_func(dso,"ub_ctx_create")) == NULL ||
(p_ub_ctx_resolvconf.p = DSO_bind_func(dso,"ub_ctx_resolvconf")) == NULL ||
(p_ub_ctx_add_ta_file.p = DSO_bind_func(dso,"ub_ctx_add_ta_file")) == NULL ||
(p_ub_ctx_delete.p = DSO_bind_func(dso,"ub_ctx_delete")) == NULL ||
(p_ub_resolve.p = DSO_bind_func(dso,"ub_resolve")) == NULL ||
(p_ub_resolve_free.p = DSO_bind_func(dso,"ub_resolve_free")) == NULL ||
(ctx = p_ub_ctx_create.f()) == NULL) {
DSO_free(dso);
return;
}
unbound_dso = dso;
/* FIXME: parameterize these through CONF */
p_ub_ctx_resolvconf.f(ctx,"/etc/resolv.conf");
p_ub_ctx_add_ta_file.f(ctx,"/var/lib/unbound/root.key");
}
static void unbound_fini(void)
{
if (ctx != NULL) p_ub_ctx_delete.f(ctx);
if (unbound_dso != NULL) DSO_free(unbound_dso);
}
#endif
/*
* Output is array packed as [len][data][len][data][0]
*/
unsigned char *SSL_get_tlsa_record_byname (const char *name,int port,int type)
{
unsigned char *ret=NULL;
char *query=NULL;
size_t qlen;
#ifndef OPENSSL_NO_LIBUNBOUND
if (ctx == NULL) return NULL;
#elif defined(RRSET_VALIDATED)
static union {
void *p; int (*f)(const char*,unsigned int,unsigned int,unsigned int,struct rrsetinfo **); }
p_getrrsetbyname = {NULL};
static union {
void *p; void (*f)(struct rrsetinfo *); }
p_freerrset = {NULL};
if (p_getrrsetbyname.p==NULL) {
if ((p_getrrsetbyname.p = DSO_global_lookup("getrrsetbyname")) == NULL ||
(p_freerrset.p = DSO_global_lookup("freerrset")) == NULL)
p_getrrsetbyname.p = (void*)-1;
}
if (p_getrrsetbyname.p == (void *)-1) return NULL;
#endif
qlen = 7+5+strlen(name)+1;
if ((query = OPENSSL_malloc(qlen)) == NULL)
return NULL;
BIO_snprintf(query,qlen,"_%u._%s.%s",port&0xffff,type==SOCK_STREAM?"tcp":"udp",name);
#ifndef OPENSSL_NO_LIBUNBOUND
{
struct ub_result *tlsa=NULL;
if (p_ub_resolve.f(ctx,query,52,1,&tlsa)==0 &&
tlsa->havedata && tlsa->data[0]!=NULL) {
ret=(void*)-1; /* -1 means insecure */
if (tlsa->secure) do {
unsigned char *data;
unsigned int dlen, i;
for (dlen=0, i=0; tlsa->data[i]; i++)
dlen += sizeof(int)+(unsigned int)tlsa->len[i];
dlen +=sizeof(int);
if ((ret = OPENSSL_malloc(dlen)) == NULL) break;
for (data=ret, i=0; tlsa->data[i]; i++) {
*(unsigned int *)data = dlen = (unsigned int)tlsa->len[i];
data += sizeof(unsigned int);
memcpy(data,tlsa->data[i],dlen);
data += dlen;
}
*(unsigned int *)data = 0; /* trailing zero */
} while (0);
p_ub_resolve_free.f(tlsa);
}
}
#elif defined(RRSET_VALIDATED)
{
struct rrsetinfo *rrset=NULL;
if (p_getrrsetbyname.f(query,1,52,RRSET_VALIDATED,&rrset) == 0 && rrset->rri_nrdatas) {
ret=(void*)-1; /* -1 means insecure */
if ((rrset->rri_flags&RRSET_VALIDATED)) do {
unsigned char *data;
unsigned int dlen, i;
for (dlen=0, i=0; i<rrset->rri_nrdatas; i++)
dlen += sizeof(int)+rrset->rri_rdatas[i].rdi_length;
dlen +=sizeof(int);
if ((ret = OPENSSL_malloc(sizeof(int)+dlen)) == NULL) break;
for (data=ret, i=0; i<rrset->rri_rdatas[i].rdi_length; i++) {
*(unsigned int *)data = dlen = rrset->rri_rdatas[i].rdi_length;
data += sizeof(unsigned int);
memcpy(data,rrset->rri_rdatas[i].rdi_data,dlen);
data += dlen;
}
*(unsigned int *)data = 0; /* trailing zero */
} while (0);
p_freerrset.f(rrset);
}
}
#elif defined(_WIN32_NOT_YET)
{
PDNS_RECORD rrset;
DnsQuery_A(query,52,DNS_QUERY_STANDARD,NULL,&rrset,NULL);
DnsRecordListFree(rrset,DnsFreeRecordList);
}
#endif
CRYPTO_free(query);
return ret;
}
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