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net: lib: http: Correct http_client edge-case behavior

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Correct various small edge-case behaviors that have been accidentally
introduced in the http_client.

- http_client_req no longer incorrectly returns -ETIMEDOUT on NULL HTTP
  resonse. -ETIMEDOUT is now only returned when the underlying TLS
  socket times out.
- http_client_req now returns -ECONRESET upon incomplete (but non-NULL)
  HTTP response. The request callback is no longer called in this case
  (as with any other error state).
- http_wait_data has been refactored slightly to increase clarity.

Signed-off-by: Georges Oates_Larsen <georges.larsen@nordicsemi.no>
This commit is contained in:
Georges Oates_Larsen 2024-03-29 15:01:05 -07:00 committed by Mahesh Mahadevan
parent e354927895
commit 7fc6ef28d3
1 changed files with 58 additions and 47 deletions
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95
subsys/net/lib/http/http_client.c
View file

@ -392,7 +392,11 @@ static void http_client_init_parser(struct http_parser *parser,
settings->on_url = on_url;
}
static void http_data_final_null_resp(struct http_request *req)
/* Report a NULL HTTP response to the caller.
* A NULL response is when the HTTP server intentionally closes the TLS socket (using FINACK)
* without sending any HTTP payload.
*/
static void http_report_null(struct http_request *req)
{
if (req->internal.response.cb) {
NET_DBG("Calling callback for Final Data"
@ -413,6 +417,28 @@ static void http_data_final_null_resp(struct http_request *req)
}
}
/* Report a completed HTTP transaction (with no error) to the caller */
static void http_report_complete(struct http_request *req)
{
if (req->internal.response.cb) {
NET_DBG("Calling callback for %zd len data", req->internal.response.data_len);
req->internal.response.cb(&req->internal.response, HTTP_DATA_FINAL,
req->internal.user_data);
}
}
/* Report that some data has been received, but the HTTP transaction is still ongoing. */
static void http_report_progress(struct http_request *req)
{
if (req->internal.response.cb) {
NET_DBG("Calling callback for partitioned %zd len data",
req->internal.response.data_len);
req->internal.response.cb(&req->internal.response, HTTP_DATA_MORE,
req->internal.user_data);
}
}
static int http_wait_data(int sock, struct http_request *req, int32_t timeout)
{
int total_received = 0;
@ -438,24 +464,26 @@ static int http_wait_data(int sock, struct http_request *req, int32_t timeout)
ret = zsock_poll(fds, nfds, remaining_time);
if (ret == 0) {
LOG_DBG("Timeout");
goto finalize_data;
ret = -ETIMEDOUT;
goto error;
} else if (ret < 0) {
ret = -errno;
goto error;
}
if (fds[0].revents & (ZSOCK_POLLERR | ZSOCK_POLLNVAL)) {
ret = -errno;
goto error;
} else if (fds[0].revents & ZSOCK_POLLHUP) {
/* Connection closed */
LOG_DBG("Connection closed");
goto finalize_data;
goto closed;
} else if (fds[0].revents & ZSOCK_POLLIN) {
received = zsock_recv(sock, req->internal.response.recv_buf + offset,
req->internal.response.recv_buf_len - offset, 0);
if (received == 0) {
/* Connection closed */
LOG_DBG("Connection closed");
goto finalize_data;
goto closed;
} else if (received < 0) {
ret = -errno;
goto error;
} else {
req->internal.response.data_len += received;
@ -472,27 +500,11 @@ static int http_wait_data(int sock, struct http_request *req, int32_t timeout)
offset = 0;
}
if (req->internal.response.cb) {
bool notify = false;
enum http_final_call event;
if (req->internal.response.message_complete) {
NET_DBG("Calling callback for %zd len data",
req->internal.response.data_len);
notify = true;
event = HTTP_DATA_FINAL;
http_report_complete(req);
break;
} else if (offset == 0) {
NET_DBG("Calling callback for partitioned %zd len data",
req->internal.response.data_len);
notify = true;
event = HTTP_DATA_MORE;
}
if (notify) {
req->internal.response.cb(&req->internal.response, event,
req->internal.user_data);
http_report_progress(req);
/* Re-use the result buffer and start to fill it again */
req->internal.response.data_len = 0;
@ -501,25 +513,28 @@ static int http_wait_data(int sock, struct http_request *req, int32_t timeout)
}
}
if (req->internal.response.message_complete) {
ret = total_received;
break;
}
}
} while (true);
return ret;
return total_received;
finalize_data:
ret = total_received;
closed:
LOG_DBG("Connection closed");
http_data_final_null_resp(req);
return ret;
/* If connection was closed with no data sent, this is a NULL response, and is a special
* case valid response.
*/
if (total_received == 0) {
http_report_null(req);
return total_received;
}
/* Otherwise, connection was closed mid-way through response, and this should be
* considered an error.
*/
ret = -ECONNRESET;
error:
LOG_DBG("Connection error (%d)", errno);
ret = -errno;
LOG_DBG("Connection error (%d)", ret);
return ret;
}
@ -719,10 +734,6 @@ int http_client_req(int sock, struct http_request *req,
NET_DBG("Wait data failure (%d)", total_recv);
ret = total_recv;
goto out;
} else if (total_recv == 0) {
NET_DBG("Timeout while waiting data");
ret = -ETIMEDOUT;
goto out;
}
NET_DBG("Received %d bytes", total_recv);