feat(sockutls): Add initial support for socket helpers

components/sock_utils/include/ifaddrs.h

@@ -0,0 +1,56 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#pragma once
+
+#include "lwip/sockets.h"
+#include "netdb_macros.h"
+// include also other related headers to simplify porting of linux libs
+#include "getnameinfo.h"
+#include "socketpair.h"
+#include "gai_strerror.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef CONFIG_IDF_TARGET_LINUX
+// namespace with esp_ on linux to avoid duplication of symbols
+#define getifaddrs esp_getifaddrs
+#define freeifaddrs esp_freeifaddrs
+#endif
+
+/**
+ * @brief Simplified version of ifaddr struct
+ */
+struct ifaddrs {
+    struct ifaddrs  *ifa_next;    /* Next item in list */
+    char            *ifa_name;    /* Name of interface */
+    struct sockaddr *ifa_addr;    /* Address of interface */
+    unsigned int ifa_flags;
+};
+
+/**
+ * @brief Retrieves a list of network interfaces and their addresses.
+ *
+ * @param[out] ifap Pointer to a linked list of `struct ifaddrs`. On success, `*ifap` will be set
+ *                  to the head of the list.
+ *
+ * @return
+ *     - 0 on success.
+ *     - -1 on failure, with `errno` set to indicate the error.
+ */
+int getifaddrs(struct ifaddrs **ifap);
+
+/**
+ * @brief Frees the memory allocated by `getifaddrs()`.
+ *
+ * @param[in] ifa Pointer to the linked list of network interfaces to be freed.
+ */
+void freeifaddrs(struct ifaddrs *ifa);
+
+#ifdef __cplusplus
+}
+#endif