mdns: Add host test using linux target

* Original commit: espressif/esp-idf@fc7e2d9e90

components/mdns/host_test/components/esp_netif_linux/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS esp_netif_linux.c
+                       INCLUDE_DIRS include
+                       REQUIRES esp_system_protocols_linux)

components/mdns/host_test/components/esp_netif_linux/Kconfig

@@ -0,0 +1,9 @@
+menu "LWIP-MOCK-CONFIG"
+
+    config LWIP_IPV6
+        bool "Enable IPv6"
+        default true
+        help
+            Enable/disable IPv6
+
+endmenu

components/mdns/host_test/components/esp_netif_linux/esp_netif_linux.c

@@ -0,0 +1,163 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include<stdio.h>
+#include <stdlib.h>
+
+#include "esp_netif.h"
+#include "esp_err.h"
+#include <string.h>	//strlen
+#include <sys/socket.h>
+#include <arpa/inet.h>	//inet_addr
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+#include "esp_netif_types.h"
+
+#define MAX_NETIFS  4
+
+static esp_netif_t* s_netif_list[MAX_NETIFS] = { 0 };
+
+struct esp_netif_obj
+{
+    const char *if_key;
+    const char *if_desc;
+};
+
+esp_netif_t *esp_netif_get_handle_from_ifkey(const char *if_key)
+{
+    for (int i=0; i<MAX_NETIFS; ++i) {
+        if (s_netif_list[i] && strcmp(s_netif_list[i]->if_key, if_key) == 0) {
+            return s_netif_list[i];
+        }
+    }
+    return NULL;
+}
+
+esp_err_t esp_netif_get_ip_info(esp_netif_t *esp_netif, esp_netif_ip_info_t *ip_info)
+{
+    if (esp_netif == NULL) {
+        return ESP_ERR_INVALID_STATE;
+    }
+    struct ifaddrs *addrs, *tmp;
+    getifaddrs(&addrs);
+    tmp = addrs;
+
+    while (tmp) {
+        if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET) {
+            char addr[20];
+            struct sockaddr_in *pAddr = (struct sockaddr_in *) tmp->ifa_addr;
+            inet_ntop(AF_INET, &pAddr->sin_addr, addr, sizeof(addr) );
+            if (strcmp(esp_netif->if_desc, tmp->ifa_name) == 0) {
+                printf("AF_INET: %s: %s\n", tmp->ifa_name, addr);
+                memcpy(&ip_info->ip.addr, &pAddr->sin_addr, 4);
+                break;
+            }
+        }
+        tmp = tmp->ifa_next;
+    }
+    return ESP_OK;
+}
+
+esp_err_t esp_netif_dhcpc_get_status(esp_netif_t *esp_netif, esp_netif_dhcp_status_t *status)
+{
+    return ESP_OK;
+}
+
+
+esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6)
+{
+    if (esp_netif == NULL) {
+        return ESP_ERR_INVALID_STATE;
+    }
+    struct ifaddrs *addrs, *tmp;
+    getifaddrs(&addrs);
+    tmp = addrs;
+
+    while (tmp)
+    {
+        if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET6) {
+            char addr[64];
+            struct sockaddr_in6 *pAddr = (struct sockaddr_in6 *)tmp->ifa_addr;
+            inet_ntop(AF_INET6, &pAddr->sin6_addr, addr, sizeof(addr) );
+            if (strcmp(esp_netif->if_desc, tmp->ifa_name) == 0) {
+                printf("AF_INET6: %s: %s\n", tmp->ifa_name, addr);
+                memcpy(if_ip6->addr, &pAddr->sin6_addr, 4*4);
+                break;
+            }
+        }
+        tmp = tmp->ifa_next;
+    }
+
+    freeifaddrs(addrs);
+    return ESP_OK;
+}
+
+
+int esp_netif_get_netif_impl_index(esp_netif_t *esp_netif)
+{
+    if (esp_netif == NULL) {
+        return -1;
+    }
+    uint32_t interfaceIndex = if_nametoindex(esp_netif->if_desc);
+    return interfaceIndex;
+}
+
+esp_err_t esp_netif_get_netif_impl_name(esp_netif_t *esp_netif, char* name)
+{
+    if (esp_netif == NULL) {
+        return ESP_ERR_INVALID_STATE;
+    }
+    strcpy(name, esp_netif->if_desc);
+    return ESP_OK;
+}
+
+const char *esp_netif_get_desc(esp_netif_t *esp_netif)
+{
+    if (esp_netif == NULL) {
+        return NULL;
+    }
+    return esp_netif->if_desc;
+}
+
+esp_netif_t *esp_netif_new(const esp_netif_config_t *config)
+{
+    if (esp_netif_get_handle_from_ifkey(config->base->if_key)) {
+        return NULL;
+    }
+    esp_netif_t* netif = calloc(1, sizeof(struct esp_netif_obj));
+    if (netif) {
+        netif->if_desc = config->base->if_desc;
+        netif->if_key = config->base->if_key;
+    }
+
+    for (int i=0; i<MAX_NETIFS; ++i) {
+        if (s_netif_list[i] == NULL) {
+            s_netif_list[i] = netif;
+            break;
+        }
+    }
+
+    return netif;
+}
+
+void esp_netif_destroy(esp_netif_t *esp_netif)
+{
+    for (int i=0; i<MAX_NETIFS; ++i) {
+        if (s_netif_list[i] == esp_netif) {
+            s_netif_list[i] = NULL;
+            break;
+        }
+    }
+    free(esp_netif);
+}

components/mdns/host_test/components/esp_netif_linux/include/esp_wifi_types.h

@@ -0,0 +1,15 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+#include "esp_event.h"