sys/net/application_layer/sock_dns_mock: add module for mocking sock_dns

sys/Makefile

@@ -143,6 +143,9 @@ endif
 ifneq (,$(filter sock_dns,$(USEMODULE)))
   DIRS += net/application_layer/sock_dns
 endif
+ifneq (,$(filter sock_dns_mock,$(USEMODULE)))
+  DIRS += net/application_layer/sock_dns_mock
+endif
 ifneq (,$(filter sock_util,$(USEMODULE)))
   DIRS += net/sock
 endif

sys/include/net/dns_mock.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2022 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    net_dns_mock DNS defines
+ * @ingroup     net
+ * @brief       Generic DNS mock values
+ * @{
+ *
+ * @file
+ * @brief   Generic DNS mock values
+ *
+ * @author  Hendrik van Essen <hendrik.ve@fu-berlin.de>
+ */
+#ifndef NET_DNS_MOCK_H
+#define NET_DNS_MOCK_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "net/ipv4/addr.h"
+#include "net/ipv6/addr.h"
+
+/**
+ * @brief Hostname used to query.
+ */
+#define SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME "example.com"
+
+/**
+ * @brief IPv4 address for @ref SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME.
+ *        Address represents "93.184.216.34".
+ */
+static const ipv4_addr_t sock_dns_mock_example_com_addr_ipv4 = { { 0x5d, 0xb8, 0xd8, 0x22 } };
+
+/**
+ * @brief IPv6 address for @ref SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME.
+ *        Address represents "2606:2800:220:1:248:1893:25c8:1946".
+ */
+static const ipv6_addr_t sock_dns_mock_example_com_addr_ipv6 = { {
+        0x26, 0x06, 0x28, 0x00, 0x02, 0x20, 0x00, 0x01,
+        0x02, 0x48, 0x18, 0x93, 0x25, 0xc8, 0x19, 0x46
+    }
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_DNS_MOCK_H */
+/** @} */

sys/net/application_layer/sock_dns_mock/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

sys/net/application_layer/sock_dns_mock/dns_mock.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2022 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup net_dns_mock
+ * @{
+ * @file
+ * @brief   sock DNS mock implementation
+ * @author  Hendrik van Essen <hendrik.ve@fu-berlin.de>
+ * @author  Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ * @}
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include "net/af.h"
+#include "net/dns_mock.h"
+
+int sock_dns_query(const char *domain_name, void *addr_out, int family)
+{
+    if (strcmp(domain_name, SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME)) {
+        return -ENOTSUP;
+    }
+
+    switch (family) {
+    case AF_INET:
+        memcpy(addr_out, &sock_dns_mock_example_com_addr_ipv4, sizeof(ipv4_addr_t));
+        return sizeof(ipv4_addr_t);
+
+    case AF_UNSPEC:
+        /* fall-through */
+    case AF_INET6:
+        memcpy(addr_out, &sock_dns_mock_example_com_addr_ipv6, sizeof(ipv6_addr_t));
+        return sizeof(ipv6_addr_t);
+    default:
+        return -EAFNOSUPPORT;
+    }
+}

sys/net/netutils/util.c

@@ -20,7 +20,7 @@
 #include <string.h>
 
 #include "net/utils.h"
-#ifdef MODULE_SOCK_DNS
+#if defined(MODULE_SOCK_DNS) || defined(MODULE_SOCK_DNS_MOCK)
 #include "net/af.h"
 #include "net/sock/dns.h"
 #endif
@@ -44,7 +44,7 @@ int netutils_get_ipv4(ipv4_addr_t *addr, const char *hostname)
     for (size_t i = 0; i < strlen(hostname); i++) {
         bool is_not_ipv4 = (hostname[i] < '0' || hostname[i] > '9') && hostname[i] != '.';
 
-#ifdef MODULE_SOCK_DNS
+#if defined(MODULE_SOCK_DNS) || defined(MODULE_SOCK_DNS_MOCK)
         /* once we see an invalid character for an IPv4 address try to
          * resolve the hostname by DNS */
         if (is_not_ipv4) {
@@ -77,7 +77,7 @@ int netutils_get_ipv6(ipv6_addr_t *addr, netif_t **netif, const char *hostname)
         return -EINVAL;
     }
 
-#ifdef MODULE_SOCK_DNS
+#if defined(MODULE_SOCK_DNS) || defined(MODULE_SOCK_DNS_MOCK)
     /* hostname is not an IPv6 address */
     if (strchr(hostname, ':') == NULL) {
         int res = sock_dns_query(hostname, addr, AF_INET6);

sys/net/sock/sock_util.c

@@ -28,7 +28,8 @@
 
 #include "net/sock/udp.h"
 #include "net/sock/util.h"
-#ifdef MODULE_SOCK_DNS
+
+#if defined(MODULE_SOCK_DNS) || defined(MODULE_SOCK_DNS_MOCK)
 #include "net/sock/dns.h"
 #endif
 
@@ -264,7 +265,7 @@ int sock_tl_name2ep(struct _sock_tl_ep *ep_out, const char *str)
         return 0;
     }
 
-#if defined(MODULE_SOCK_DNS)
+#if defined(MODULE_SOCK_DNS) || defined(MODULE_SOCK_DNS_MOCK)
     int family;
     char hostbuf[CONFIG_SOCK_HOSTPORT_MAXLEN];
     const char *host;

tests/netutils/Makefile

@@ -12,7 +12,6 @@ USEMODULE += gnrc_ipv6
 USEMODULE += ipv4_addr
 USEMODULE += ipv6_addr
 
-# pretend to include sock_dns
-CFLAGS += -DMODULE_SOCK_DNS=1
+USEMODULE += sock_dns_mock
 
 include $(RIOTBASE)/Makefile.include

tests/netutils/main.c

@@ -18,6 +18,7 @@
 
 #include "embUnit.h"
 
+#include "net/dns_mock.h"
 #include "net/gnrc/netif.h"
 #include "net/sock/util.h"
 #include "net/utils.h"
@@ -101,16 +102,11 @@ static void test_ipv6_addr_from_str__invalid_interface(void)
 
 static void test_ipv6_addr_from_str__success4(void)
 {
-    static const ipv6_addr_t a = { {
-            0x26, 0x06, 0x28, 0x00, 0x02, 0x20, 0x00, 0x01,
-            0x02, 0x48, 0x18, 0x93, 0x25, 0xc8, 0x19, 0x46
-        }
-    };
     ipv6_addr_t address;
     netif_t *netif;
 
-    TEST_ASSERT_EQUAL_INT(netutils_get_ipv6(&address, &netif, "example.com"), 0);
-    TEST_ASSERT(ipv6_addr_equal(&a, &address));
+    TEST_ASSERT_EQUAL_INT(netutils_get_ipv6(&address, &netif, SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME), 0);
+    TEST_ASSERT(ipv6_addr_equal(&sock_dns_mock_example_com_addr_ipv6, &address));
 }
 
 static void test_ipv6_addr_from_str__success5(void)
@@ -164,11 +160,10 @@ static void test_ipv4_addr_from_str__success(void)
 
 static void test_ipv4_addr_from_str__success2(void)
 {
-    static const ipv4_addr_t a = { { 0x5d, 0xb8, 0xd8, 0x22 } };
     ipv4_addr_t address;
 
-    TEST_ASSERT_EQUAL_INT(netutils_get_ipv4(&address, "example.com"), 0);
-    TEST_ASSERT(ipv4_addr_equal(&a, &address));
+    TEST_ASSERT_EQUAL_INT(netutils_get_ipv4(&address, SOCK_DNS_MOCK_EXAMPLE_COM_HOSTNAME), 0);
+    TEST_ASSERT(ipv4_addr_equal(&sock_dns_mock_example_com_addr_ipv4, &address));
 }
 
 Test *tests_netutils_ipv4_tests(void)