PR to close #29 missing can isotp wait tx done flag to trigger a timeout

src/tp/isotp_sock.c

@@ -147,17 +147,21 @@ static int LinuxSockBind(const char *if_name, uint32_t rxid, uint32_t txid, bool
         perror("setsockopt");
         return -1;
     }
-
+
+    struct can_isotp_options opts;
+    memset(&opts, 0, sizeof(opts));
+    // configure socket to wait for tx completion to catch FC frame timeouts
+    opts.flags |= CAN_ISOTP_WAIT_TX_DONE;
+
     if (functional) {
         printf("configuring fd: %d as functional\n", fd);
         // configure the socket as listen-only to avoid sending FC frames
-        struct can_isotp_options opts;
-        memset(&opts, 0, sizeof(opts));
         opts.flags |= CAN_ISOTP_LISTEN_MODE;
-        if (setsockopt(fd, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts)) < 0) {
-            perror("setsockopt (isotp_options):");
-            return -1;
-        }
+    }
+
+    if (setsockopt(fd, SOL_CAN_ISOTP, CAN_ISOTP_OPTS, &opts, sizeof(opts)) < 0) {
+        perror("setsockopt (isotp_options):");
+        return -1;
     }
 
     struct ifreq ifr;

test/test_tp_compliance.c

@@ -95,13 +95,31 @@ void TestISOTPSendRecvMaxLen(void **state) {
     assert_memory_equal(UDSTpGetRecvBuf(srv, NULL), MSG, sizeof(MSG));
 }
 
+void TestISOTPFlowControlFrameTimeout(void **state) {
+    if (!IsISOTP()) {
+        skip();
+    }
+
+    // killing server so that no response is sent to client
+    ENV_TpFree(srv);
+
+    // sending multiframe to wait for Flow Control frame
+    // which will not arrive since no server is running
+    const uint8_t MSG[] = {1, 2, 3, 4, 5, 6, 7, 8};
+    ssize_t ret = UDSTpSend(client, MSG, sizeof(MSG), NULL);
+
+    // failure is expected as the elapsed 1s timeout raises an error on the ISOTP socket
+    assert_true(ret < 0);
+}
+
 int main() {
     const struct CMUnitTest tests[] = {
         // cmocka_unit_test_setup_teardown(TestSendRecv, setup, teardown),
         cmocka_unit_test_setup_teardown(TestSendRecvFunctional, setup, teardown),
         cmocka_unit_test_setup_teardown(TestISOTPSendLargestSingleFrame, setup, teardown),
         cmocka_unit_test_setup_teardown(TestISOTPSendLargerThanSingleFrameFails, setup, teardown),
         cmocka_unit_test_setup_teardown(TestISOTPSendRecvMaxLen, setup, teardown),
+        cmocka_unit_test_setup_teardown(TestISOTPFlowControlFrameTimeout, setup, teardown),
     };
     return cmocka_run_group_tests(tests, NULL, NULL);
 }