Add curl easy socket backend. #380

philljj · 2023-12-06T18:04:30Z

Description

Added libcurl easy socket backend support for testing purposes.

Built with:

./configure --enable-curl

Prereqs

wolfssl has been built with --enable-curl and installed to /usr/local.
libcurl has been built with --with-wolfssl and installed to /usr/local.

Testing

Added new curl easy socket example to examples/mqttnet.c, gated behind ENABLE_MQTT_CURL. If using TLS a CAfile can be passed in with -A:

$./examples/mqttclient/mqttclient -p 8883 -A mosquitto.org.crt -t
MQTT Client: QoS 0, Use TLS 1
MQTT Net Init: Success (0)
MQTT Init: Success (0)
*   Trying [2001:41d0:1:925e::1]:8883...
*   Trying 91.121.93.94:8883...
* Connected to test.mosquitto.org (2001:41d0:1:925e::1) port 8883
* successfully set certificate verify locations:
*  CAfile: mosquitto.org.crt
*  CApath: /etc/ssl/certs
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* using HTTP/1.x
* Connection #0 to host test.mosquitto.org left intact
MQTT Socket Connect: Success (0)
MQTT Connect: Proto (v3.1.1), Success (0)
MQTT Connect Ack: Return Code 0, Session Present 0
MQTT Subscribe: Success (0)
  Topic wolfMQTT/example/testTopic, Qos 0, Return Code 0
MQTT Publish: Topic wolfMQTT/example/testTopic, ID 2, Success (0)
MQTT Waiting for message...
MQTT Message: Topic wolfMQTT/example/testTopic, Qos 0, Len 4
Payload (0 - 4) printing 4 bytes:
test
MQTT Message: Done

$./examples/mqttclient/mqttclient -p 1883
MQTT Client: QoS 0, Use TLS 0
MQTT Net Init: Success (0)
MQTT Init: Success (0)
*   Trying [2001:41d0:1:925e::1]:1883...
* Connected to test.mosquitto.org (2001:41d0:1:925e::1) port 1883
* Connection #0 to host test.mosquitto.org left intact
MQTT Socket Connect: Success (0)
MQTT Connect: Proto (v3.1.1), Success (0)
MQTT Connect Ack: Return Code 0, Session Present 0
MQTT Subscribe: Success (0)
  Topic wolfMQTT/example/testTopic, Qos 0, Return Code 0
MQTT Publish: Topic wolfMQTT/example/testTopic, ID 2, Success (0)
MQTT Waiting for message...
MQTT Message: Topic wolfMQTT/example/testTopic, Qos 0, Len 4
Payload (0 - 4) printing 4 bytes:
test
MQTT Message: Done

Also test with:

./configure --enable-curl && make check

./configure --enable-mt --enable-nonblock CFLAGS="-DWOLFMQTT_TEST_NONBLOCK" --enable-curl  && make check

These tests are enabled and work with --enable-curl:

scripts/firmware.test
scripts/client.test

These tests work as well if they are enabled:

scripts/multithread.test
scripts/nbclient.test

dgarske · 2023-12-06T18:13:16Z

configure.ac

+
+if test "x$ENABLED_CURL" = "xyes"; then
+    if test "x$ENABLED_TLS" = "xyes"; then
+        AC_MSG_ERROR([--enable-tls and --enable-curl are incompatible])


Do these really need to be incompatible? Just seems odd to forcefully have to disable TLS here to get the CURL easy sockets to work.

In the last update --enable-curl and --enable-tls are allowed now. It disables some examples that aren't expected to work with curl. And when curl is enabled some of the lower level TLS code in src/mqtt_socket.c is gated out.

src/mqtt_curl.c

dgarske · 2023-12-06T18:15:32Z

src/mqtt_curl.c

+    #include <errno.h>
+#endif
+
+#include "wolfmqtt/mqtt_client.h"


We must support building sources directly. This while file needs wrapped with ENABLE_MQTT_CURL

Good catch!

examples/mqttcurl.c

dgarske · 2023-12-06T18:18:39Z

examples/mqttcurl.c

+
+    if (ctx->curl == NULL) {
+        PRINTF("error: curl_easy_init returned NULL");
+        return MQTT_CODE_ERROR_MEMORY;


Please refactor to single return point. Can't you leak handles returning early?

Done! Refactored the setopt and curl_easy_perform to a separate function, and the handle is cleaned up if that function fails.

examples/mqttexample.c

src/mqtt_curl.c

embhorn · 2023-12-06T20:55:23Z

src/mqtt_curl.c

+    }
+
+    return rc;
+}


Some compilers complain when there is no blank line at the eof.

src/mqtt_curl.c

configure.ac

embhorn

Could you add a section to the readme about using the libcurl option?

philljj · 2023-12-08T16:21:57Z

The client and firmware tests work with --enable-curl now, and the curl support includes TLS and mTLS.

Will add a github action now.

dgarske

Great work. Looking forward to the GitHub CI action being in place.

dgarske · 2023-12-08T16:35:02Z

examples/mqttnet.c

+
+    FD_SET(sockfd, &errfd);
+
+    if(for_recv) {


NIT: Please use if ( ... add space.

dgarske · 2023-12-08T16:35:27Z

examples/mqttnet.c

+        return MQTT_CODE_ERROR_BAD_ARG;
+    }
+
+    /* Toggle with option, or put behind debug define? */


Please wrap with DEBUG_WOLFMQTT

philljj · 2023-12-08T17:33:15Z

Added the curl ubuntu CI test in a separate workflow
.github/workflows/ubuntu-check-curl.yml
just to avoid potential side-effects between the with and without curl CI tests.

(The --enable-curl in wolfssl pulls in opensslextra and other things).

The new workflow tests these combinations:

--enable-curl
--enable-curl --disable-tls

dgarske · 2023-12-08T18:44:42Z

src/mqtt_socket.c

@@ -534,6 +544,10 @@ int MqttSocket_Disconnect(MqttClient *client)
            rc = client->net->disconnect(client->net->context);
        }
        MqttClient_Flags(client, MQTT_CLIENT_FLAG_IS_CONNECTED, 0);
+
+    #ifdef ENABLE_MQTT_CURL
+        curl_global_cleanup();


Should this now be in mqttnet.c or maybe MqttClient_DeInit?

I think mqttnet.c is too low level.

Would want it somewhere higher level where it's among the first/last functions called on init/exit.

mqtt_socket just seemed natural because that's where we call wolfSSL_Init/cleanup.

dgarske · 2023-12-08T18:45:08Z

src/mqtt_socket.c

@@ -34,6 +34,10 @@
    #include <errno.h>
 #endif

+#ifdef ENABLE_MQTT_CURL


Can likely be removed if curl_global_cleanup is moved

dgarske · 2023-12-08T19:11:49Z

examples/mqttnet.c

+mqttcurl_connect(SocketContext * sock, const char* host, word16 port,
+    int timeout_ms)
+{
+    CURLcode res = 0;


examples/mqttnet.c:435:14: error: cannot initialize a variable of type 'CURLcode' with an rvalue of type 'int' CURLcode res = 0; ^ ~ examples/mqttnet.c:647:21: error: cannot initialize a variable of type 'CURLcode' with an rvalue of type 'int' CURLcode res = 0; ^ ~ examples/mqttnet.c:714:21: error: cannot initialize a variable of type 'CURLcode' with an rvalue of type 'int' CURLcode res = 0; ^ ~

embhorn

./configure --enable-all --enable-curl produces build errors:

examples/mqttnet.c: In function ‘SN_ClientNet_Init’:
examples/mqttnet.c:1442:24: error: ‘SN_NetConnect’ undeclared (first use in this function); did you mean ‘NetConnect’?
 1442 |         net->connect = SN_NetConnect;
      |                        ^~~~~~~~~~~~~
      |                        NetConnect
examples/mqttnet.c:1442:24: note: each undeclared identifier is reported only once for each function it appears in
examples/mqttnet.c:1445:21: error: ‘NetPeek’ undeclared (first use in this function)
 1445 |         net->peek = NetPeek;
      |                     ^~~~~~~

philljj · 2023-12-08T21:24:30Z

I think several of these combinations need to be rejected in configure.ac. Looking at this.

embhorn

In examples/mqttclient/mqttclient, the client gets into the "Read loop" and fails to send messages typed. Also the client never sends a ping, just exits on timeout:

MQTT Waiting for message...
MQTT Message: Topic wolfMQTT/example/testTopic, Qos 0, Len 4
Payload (0 - 4) printing 4 bytes:
test
MQTT Message: Done
test
error: recvd 0 bytes, expected 2
Network Error Callback: Error (libcurl) (error -16)
MQTT Message Wait: Error (libcurl) (-16)
MQTT Disconnect: Success (0)
MQTT Socket Disconnect: Success (0)

philljj · 2023-12-08T22:44:04Z

Also, I'll document more clearly which --enable- options are compatible with --enable-curl.

… TIMEOUT, fix tests.

dgarske

@embhorn when you are happy merge please.

embhorn

Fantastic!

Add curl easy socket backend.

2b267f6

philljj self-assigned this Dec 6, 2023

dgarske requested changes Dec 6, 2023

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dgarske requested a review from embhorn December 6, 2023 18:20

embhorn requested changes Dec 6, 2023

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philljj added 3 commits December 6, 2023 22:59

Add curl easy socket backend: consolidate mqttcurl into mqttnet.

e25d2a6

Add curl easy socket backend: consolidate mqtt_curl into mqtt_socket.

da94327

Add curl easy socket backend: allow enable-curl with enable-tls.

23b50a0

philljj requested review from embhorn and dgarske December 7, 2023 20:19

embhorn reviewed Dec 8, 2023

View reviewed changes

configure.ac Show resolved Hide resolved

embhorn reviewed Dec 8, 2023

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Add curl easy socket backend: fix tests, add curl readme.

6cdc376

dgarske requested changes Dec 8, 2023

View reviewed changes

Add curl easy socket backend: cleanup, add curl CI test.

d98607e

philljj requested review from embhorn and dgarske December 8, 2023 17:37

dgarske requested changes Dec 8, 2023

View reviewed changes

Add curl easy socket backend: fix warning, fix multithread test.

c329ef7

embhorn requested changes Dec 8, 2023

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philljj added 2 commits December 10, 2023 14:41

Add curl easy socket backend: configure checks, handle STDIN_WAKE and…

ce679c9

… TIMEOUT, fix tests.

Add curl easy socket backend: update readme.

2945e1e

philljj requested review from dgarske and embhorn December 11, 2023 16:35

dgarske approved these changes Dec 11, 2023

View reviewed changes

embhorn approved these changes Dec 11, 2023

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embhorn merged commit 15ba2f2 into wolfSSL:master Dec 11, 2023
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philljj deleted the add_curl_easy_sockets branch December 12, 2023 15:28

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Add curl easy socket backend. #380

Add curl easy socket backend. #380

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Add curl easy socket backend. #380

Add curl easy socket backend. #380

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philljj commented Dec 6, 2023 • edited Loading

Description

Prereqs

Testing

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