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Diffstat (limited to 'server/resolv/async_resolv.c')
-rw-r--r--server/resolv/async_resolv.c221
1 files changed, 200 insertions, 21 deletions
diff --git a/server/resolv/async_resolv.c b/server/resolv/async_resolv.c
index 396a4e196..c13fd8788 100644
--- a/server/resolv/async_resolv.c
+++ b/server/resolv/async_resolv.c
@@ -255,6 +255,64 @@ done:
return ret;
}
+struct hostent *
+resolv_copy_hostent(TALLOC_CTX *mem_ctx, struct hostent *src)
+{
+ struct hostent *ret;
+ int len;
+ int i;
+
+ ret = talloc_zero(mem_ctx, struct hostent);
+ if (ret == NULL) {
+ return NULL;
+ }
+
+ if (src->h_name != NULL) {
+ ret->h_name = talloc_strdup(ret, src->h_name);
+ if (ret->h_name == NULL) {
+ goto fail;
+ }
+ }
+ if (src->h_aliases != NULL) {
+ for (len = 0; src->h_aliases[len] != NULL; len++);
+ ret->h_aliases = talloc_size(ret, sizeof(char *) * (len + 1));
+ if (ret->h_aliases == NULL) {
+ goto fail;
+ }
+ for (i = 0; i < len; i++) {
+ ret->h_aliases[i] = talloc_strdup(ret->h_aliases, src->h_aliases[i]);
+ if (ret->h_aliases[i] == NULL) {
+ goto fail;
+ }
+ }
+ ret->h_aliases[len] = NULL;
+ }
+ ret->h_addrtype = src->h_addrtype;
+ ret->h_length = src->h_length;
+ if (src->h_addr_list != NULL) {
+ for (len = 0; src->h_addr_list[len] != NULL; len++);
+ ret->h_addr_list = talloc_size(ret, sizeof(char *) * (len + 1));
+ if (ret->h_addr_list == NULL) {
+ goto fail;
+ }
+ for (i = 0; i < len; i++) {
+ ret->h_addr_list[i] = talloc_memdup(ret->h_addr_list,
+ src->h_addr_list[i],
+ ret->h_length);
+ if (ret->h_addr_list[i] == NULL) {
+ goto fail;
+ }
+ }
+ ret->h_addr_list[len] = NULL;
+ }
+
+ return ret;
+
+fail:
+ talloc_free(ret);
+ return NULL;
+}
+
/*******************************************************************
* Get host by name. *
*******************************************************************/
@@ -266,7 +324,7 @@ struct gethostbyname_state {
int family;
/* These are returned by ares. The hostent struct will be freed
* when the user callback returns. */
- const struct hostent *hostent;
+ struct hostent *hostent;
int status;
int timeouts;
};
@@ -301,7 +359,7 @@ resolv_gethostbyname_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
/* We need to have a wrapper around ares_gethostbyname(), because
* ares_gethostbyname() can in some cases call it's callback immediately.
* This would not let our caller to set a callback for req. */
- subreq = tevent_wakeup_send(mem_ctx, ev, tv);
+ subreq = tevent_wakeup_send(req, ev, tv);
if (subreq == NULL) {
DEBUG(1, ("Failed to add critical timer to run next operation!\n"));
talloc_zfree(req);
@@ -318,7 +376,15 @@ resolv_gethostbyname_done(void *arg, int status, int timeouts, struct hostent *h
struct tevent_req *req = talloc_get_type(arg, struct tevent_req);
struct gethostbyname_state *state = tevent_req_data(req, struct gethostbyname_state);
- state->hostent = hostent;
+ if (hostent != NULL) {
+ state->hostent = resolv_copy_hostent(req, hostent);
+ if (state->hostent == NULL) {
+ tevent_req_error(req, ENOMEM);
+ return;
+ }
+ } else {
+ state->hostent = NULL;
+ }
state->status = status;
state->timeouts = timeouts;
@@ -329,8 +395,9 @@ resolv_gethostbyname_done(void *arg, int status, int timeouts, struct hostent *h
}
int
-resolv_gethostbyname_recv(struct tevent_req *req, int *status, int *timeouts,
- struct hostent const **hostent)
+resolv_gethostbyname_recv(TALLOC_CTX *mem_ctx, struct tevent_req *req,
+ int *status, int *timeouts,
+ struct hostent **hostent)
{
struct gethostbyname_state *state = tevent_req_data(req, struct gethostbyname_state);
enum tevent_req_state tstate;
@@ -343,7 +410,9 @@ resolv_gethostbyname_recv(struct tevent_req *req, int *status, int *timeouts,
if (timeouts)
*timeouts = state->timeouts;
if (hostent)
- *hostent = state->hostent;
+ *hostent = talloc_steal(mem_ctx, state->hostent);
+ else
+ talloc_free(hostent);
if (tevent_req_is_error(req, &tstate, &err)) {
return -1;
@@ -375,6 +444,48 @@ ares_gethostbyname_wakeup(struct tevent_req *subreq)
state->family, resolv_gethostbyname_done, req);
}
+/*
+ * A simple helper function that will take an array of struct srv_reply that
+ * was allocated by malloc() in c-ares and copies it using talloc. The old one
+ * is freed and the talloc one is put into 'reply_list' instead.
+ */
+static int
+rewrite_talloc_srv_reply(TALLOC_CTX *mem_ctx, struct srv_reply **reply_list,
+ int num_replies)
+{
+ int i;
+ struct srv_reply *new_list;
+ struct srv_reply *old_list = *reply_list;
+
+ new_list = talloc_array(mem_ctx, struct srv_reply, num_replies);
+ if (new_list == NULL) {
+ return ENOMEM;
+ }
+
+ /* Copy the new_list array. */
+ for (i = 0; i < num_replies; i++) {
+ new_list[i].weight = old_list[i].weight;
+ new_list[i].priority = old_list[i].priority;
+ new_list[i].port = old_list[i].port;
+ new_list[i].host = talloc_strdup(new_list, old_list[i].host);
+ if (new_list[i].host == NULL) {
+ talloc_free(new_list);
+ return ENOMEM;
+ }
+ }
+
+ /* Free the old one (uses malloc). */
+ for (i = 0; i < num_replies; i++) {
+ free(old_list[i].host);
+ }
+ free(old_list);
+
+ /* And now put our own new_list in place. */
+ *reply_list = new_list;
+
+ return EOK;
+}
+
/*******************************************************************
* Get SRV record *
*******************************************************************/
@@ -418,7 +529,7 @@ resolv_getsrv_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
state->status = 0;
state->timeouts = 0;
- subreq = tevent_wakeup_send(mem_ctx, ev, tv);
+ subreq = tevent_wakeup_send(req, ev, tv);
if (subreq == NULL) {
DEBUG(1, ("Failed to add critical timer to run next operation!\n"));
talloc_zfree(req);
@@ -443,24 +554,36 @@ resolv_getsrv_done(void *arg, int status, int timeouts, unsigned char *abuf, int
if (status != ARES_SUCCESS) {
tevent_req_error(req, return_code(status));
- return;
+ ret = return_code(status);
+ goto fail;
}
ret = ares_parse_srv_reply(abuf, alen, &reply_list, &num_replies);
if (status != ARES_SUCCESS) {
DEBUG(2, ("SRV record parsing failed: %d: %s\n", ret, ares_strerror(ret)));
- tevent_req_error(req, return_code(ret));
- return;
+ ret = return_code(ret);
+ goto fail;
+ }
+ ret = rewrite_talloc_srv_reply(req, &reply_list, num_replies);
+ if (ret != EOK) {
+ goto fail;
}
state->reply_list = reply_list;
state->num_replies = num_replies;
tevent_req_done(req);
+ return;
+
+fail:
+ state->reply_list = NULL;
+ state->num_replies = 0;
+ tevent_req_error(req, ret);
}
int
-resolv_getsrv_recv(struct tevent_req *req, int *status, int *timeouts,
- struct srv_reply const **reply_list, int *num_replies)
+resolv_getsrv_recv(TALLOC_CTX *mem_ctx, struct tevent_req *req, int *status,
+ int *timeouts, struct srv_reply **reply_list,
+ int *num_replies)
{
struct getsrv_state *state = tevent_req_data(req, struct getsrv_state);
enum tevent_req_state tstate;
@@ -471,7 +594,9 @@ resolv_getsrv_recv(struct tevent_req *req, int *status, int *timeouts,
if (timeouts)
*timeouts = state->timeouts;
if (reply_list)
- *reply_list = state->reply_list;
+ *reply_list = talloc_steal(mem_ctx, state->reply_list);
+ else
+ talloc_free(state->reply_list);
if (num_replies)
*num_replies = state->num_replies;
@@ -504,6 +629,47 @@ ares_getsrv_wakeup(struct tevent_req *subreq)
ns_c_in, ns_t_srv, resolv_getsrv_done, req);
}
+/*
+ * A simple helper function that will take an array of struct txt_reply that
+ * was allocated by malloc() in c-ares and copies it using talloc. The old one
+ * is freed and the talloc one is put into 'reply_list' instead.
+ */
+static int
+rewrite_talloc_txt_reply(TALLOC_CTX *mem_ctx, struct txt_reply **reply_list,
+ int num_replies)
+{
+ int i;
+ struct txt_reply *new_list;
+ struct txt_reply *old_list = *reply_list;
+
+ new_list = talloc_array(mem_ctx, struct txt_reply, num_replies);
+ if (new_list == NULL) {
+ return ENOMEM;
+ }
+
+ /* Copy the new_list array. */
+ for (i = 0; i < num_replies; i++) {
+ new_list[i].length = old_list[i].length;
+ new_list[i].txt = talloc_memdup(new_list, old_list[i].txt,
+ old_list[i].length);
+ if (new_list[i].txt == NULL) {
+ talloc_free(new_list);
+ return ENOMEM;
+ }
+ }
+
+ /* Free the old one (uses malloc). */
+ for (i = 0; i < num_replies; i++) {
+ free(old_list[i].txt);
+ }
+ free(old_list);
+
+ /* And now put our own new_list in place. */
+ *reply_list = new_list;
+
+ return EOK;
+}
+
/*******************************************************************
* Get TXT record *
*******************************************************************/
@@ -548,7 +714,7 @@ resolv_gettxt_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
state->timeouts = 0;
- subreq = tevent_wakeup_send(mem_ctx, ev, tv);
+ subreq = tevent_wakeup_send(req, ev, tv);
if (subreq == NULL) {
DEBUG(1, ("Failed to add critical timer to run next operation!\n"));
talloc_zfree(req);
@@ -572,25 +738,36 @@ resolv_gettxt_done(void *arg, int status, int timeouts, unsigned char *abuf, int
state->timeouts = timeouts;
if (status != ARES_SUCCESS) {
- tevent_req_error(req, return_code(status));
- return;
+ ret = return_code(status);
+ goto fail;
}
ret = ares_parse_txt_reply(abuf, alen, &reply_list, &num_replies);
if (status != ARES_SUCCESS) {
DEBUG(2, ("TXT record parsing failed: %d: %s\n", ret, ares_strerror(ret)));
- tevent_req_error(req, return_code(ret));
- return;
+ ret = return_code(ret);
+ goto fail;
+ }
+ ret = rewrite_talloc_txt_reply(req, &reply_list, num_replies);
+ if (ret != EOK) {
+ goto fail;
}
state->reply_list = reply_list;
state->num_replies = num_replies;
tevent_req_done(req);
+ return;
+
+fail:
+ state->reply_list = NULL;
+ state->num_replies = 0;
+ tevent_req_error(req, ret);
}
int
-resolv_gettxt_recv(struct tevent_req *req, int *status, int *timeouts,
- struct txt_reply const **reply_list, int *num_replies)
+resolv_gettxt_recv(TALLOC_CTX *mem_ctx, struct tevent_req *req, int *status,
+ int *timeouts, struct txt_reply **reply_list,
+ int *num_replies)
{
struct gettxt_state *state = tevent_req_data(req, struct gettxt_state);
enum tevent_req_state tstate;
@@ -601,7 +778,9 @@ resolv_gettxt_recv(struct tevent_req *req, int *status, int *timeouts,
if (timeouts)
*timeouts = state->timeouts;
if (reply_list)
- *reply_list = state->reply_list;
+ *reply_list = talloc_steal(mem_ctx, state->reply_list);
+ else
+ talloc_free(state->reply_list);
if (num_replies)
*num_replies = state->num_replies;
generated by cgit (git 2.34.1) at 2024-04-20 08:18:25 +0000