Add AFL fuzz test

* Original commit: espressif/esp-idf@4c2622755d

components/mdns/test_afl_fuzz_host/esp32_compat.h

@@ -0,0 +1,129 @@
+// Copyright 2015-2016 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.
+
+#ifndef _ESP32_COMPAT_H_
+#define _ESP32_COMPAT_H_
+
+#ifdef MDNS_TEST_MODE
+
+#ifdef USE_BSD_STRING
+#include <bsd/string.h>
+#endif
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/time.h>
+
+#define ERR_OK                      0
+#define ESP_OK                      0
+#define ESP_FAIL                    -1
+
+#define ESP_ERR_NO_MEM              0x101
+#define ESP_ERR_INVALID_ARG         0x102
+#define ESP_ERR_INVALID_STATE       0x103
+#define ESP_ERR_INVALID_SIZE        0x104
+#define ESP_ERR_NOT_FOUND           0x105
+#define ESP_ERR_NOT_SUPPORTED       0x106
+#define ESP_ERR_TIMEOUT             0x107
+#define ESP_ERR_INVALID_RESPONSE    0x108
+#define ESP_ERR_INVALID_CRC         0x109
+
+#define pdTRUE                      true
+#define pdFALSE                     false
+
+#define portMAX_DELAY               0xFFFFFFFF
+#define portTICK_PERIOD_MS          1
+
+#define xSemaphoreTake(s,d)
+#define xSemaphoreGive(s)
+#define xSemaphoreCreateMutex()     malloc(1)
+#define vSemaphoreDelete(s)         free(s)
+#define xQueueCreate(n,s)           malloc((n)*(s))
+#define vQueueDelete(q)             free(q)
+#define xQueueReceive(q, d, t)      (ESP_OK)
+#define vTaskDelay(m)               usleep((m)*1000)
+#define pbuf_free(p)                free(p)
+
+#define tcpip_adapter_get_ip_info(i,d)
+#define tcpip_adapter_get_ip6_linklocal(i,d)    (ESP_OK)
+#define tcpip_adapter_get_hostname(i, n)        *(n) = "esp32-0123456789AB"
+
+#define IP4_ADDR(ipaddr, a,b,c,d) \
+        (ipaddr)->addr = ((uint32_t)((d) & 0xff) << 24) | \
+                         ((uint32_t)((c) & 0xff) << 16) | \
+                         ((uint32_t)((b) & 0xff) << 8)  | \
+                          (uint32_t)((a) & 0xff)
+
+typedef uint32_t esp_err_t;
+
+typedef void * xSemaphoreHandle;
+typedef void * xQueueHandle;
+
+typedef enum {
+    TCPIP_ADAPTER_IF_STA = 0,     /**< ESP32 station interface */
+    TCPIP_ADAPTER_IF_AP,          /**< ESP32 soft-AP interface */
+    TCPIP_ADAPTER_IF_ETH,         /**< ESP32 ethernet interface */
+    TCPIP_ADAPTER_IF_MAX
+} tcpip_adapter_if_t;
+
+typedef enum {
+    WIFI_MODE_NULL = 0,  /**< null mode */
+    WIFI_MODE_STA,       /**< WiFi station mode */
+    WIFI_MODE_AP,        /**< WiFi soft-AP mode */
+    WIFI_MODE_APSTA,     /**< WiFi station + soft-AP mode */
+    WIFI_MODE_MAX
+} wifi_mode_t;
+
+struct udp_pcb {
+    uint8_t dummy;
+};
+
+struct ip4_addr {
+  uint32_t addr;
+};
+typedef struct ip4_addr ip4_addr_t;
+
+struct ip6_addr {
+  uint32_t addr[4];
+};
+typedef struct ip6_addr ip6_addr_t;
+
+typedef struct {
+    ip4_addr_t ip;
+    ip4_addr_t netmask;
+    ip4_addr_t gw;
+} tcpip_adapter_ip_info_t;
+
+inline esp_err_t esp_wifi_get_mode(wifi_mode_t * mode)
+{
+    *mode = WIFI_MODE_APSTA;
+    return ESP_OK;
+}
+
+inline uint32_t xTaskGetTickCount()
+{
+    struct timeval tv;
+    struct timezone tz;
+    if (gettimeofday(&tv, &tz) == 0) {
+        return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+    }
+    return 0;
+}
+
+#endif //MDNS_TEST_MODE
+
+#endif //_ESP32_COMPAT_H_