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lib: addns: Fix ads_dns_lookup_srv() and functions to return size_t * num servers.

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Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Noel Power <npower@samba.org>
This commit is contained in:
Jeremy Allison 2020-09-08 15:45:32 -07:00 committed by Noel Power
parent a8e0d46ead
commit 2ebf3191f2
3 changed files with 22 additions and 10 deletions
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15
lib/addns/dnsquery.c
View File

@ -105,6 +105,7 @@ static void ads_dns_lookup_srv_done(struct tevent_req *subreq)
for (i=0; i<reply->ancount; i++) {
if (reply->answers[i].rr_type == DNS_QTYPE_SRV) {
/* uint16_t can't wrap here. */
state->num_srvs += 1;
}
}
@ -153,7 +154,7 @@ static void ads_dns_lookup_srv_done(struct tevent_req *subreq)
if (strcmp(srv->hostname, ar->name) != 0) {
continue;
}
/* uint16_t can't wrap here. */
tmp = talloc_realloc(
state->srvs,
srv->ss_s,
@ -200,7 +201,7 @@ NTSTATUS ads_dns_lookup_srv_recv(struct tevent_req *req,
NTSTATUS ads_dns_lookup_srv(TALLOC_CTX *ctx,
const char *name,
struct dns_rr_srv **dclist,
int *numdcs)
size_t *numdcs)
{
struct tevent_context *ev;
struct tevent_req *req;
@ -220,7 +221,7 @@ NTSTATUS ads_dns_lookup_srv(TALLOC_CTX *ctx,
}
status = ads_dns_lookup_srv_recv(req, ctx, dclist, &num_srvs);
if (NT_STATUS_IS_OK(status)) {
*numdcs = num_srvs; /* size_t->int */
*numdcs = num_srvs;
}
fail:
TALLOC_FREE(ev);
@ -794,7 +795,7 @@ static NTSTATUS ads_dns_query_internal(TALLOC_CTX *ctx,
{
char *name;
NTSTATUS status;
int num_srvs = 0;
size_t num_srvs = 0;
if ((sitename != NULL) && (strlen(sitename) != 0)) {
name = talloc_asprintf(ctx, "%s._tcp.%s._sites.%s._msdcs.%s",
@ -826,7 +827,11 @@ static NTSTATUS ads_dns_query_internal(TALLOC_CTX *ctx,
status = ads_dns_lookup_srv(ctx, name, dclist, &num_srvs);
done:
*numdcs = num_srvs; /* automatic conversion size_t->int */
/* check overflow size_t -> int */
if ((int)num_srvs < 0) {
return NT_STATUS_INVALID_PARAMETER;
}
*numdcs = num_srvs;
return status;
}

2
lib/addns/dnsquery.h
View File

@ -36,7 +36,7 @@ NTSTATUS ads_dns_lookup_srv_recv(struct tevent_req *req,
NTSTATUS ads_dns_lookup_srv(TALLOC_CTX *ctx,
const char *name,
struct dns_rr_srv **dclist,
int *numdcs);
size_t *numdcs);
struct tevent_req *ads_dns_lookup_ns_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
const char *name);

15
source4/libcli/resolve/dns_ex.c
View File

@ -268,13 +268,13 @@ done:
static struct dns_records_container get_srv_records(TALLOC_CTX *mem_ctx,
const char* name)
{
struct dns_records_container ret;
struct dns_records_container ret = {0};
char **addrs = NULL;
struct dns_rr_srv *dclist;
NTSTATUS status;
uint32_t total;
int i;
int count;
size_t total;
size_t i;
size_t count = 0;
memset(&ret, 0, sizeof(struct dns_records_container));
/* this is the blocking call we are going to lots of trouble
@ -303,6 +303,13 @@ static struct dns_records_container get_srv_records(TALLOC_CTX *mem_ctx,
}
c = get_a_aaaa_records(mem_ctx, tmp_str, dclist[i].port);
/* wrap check */
if (total + c.count < total) {
/* possibly could just break here instead? */
TALLOC_FREE(addrs);
return ret;
}
total += c.count;
if (addrs == NULL) {
addrs = c.list;