[Zephyr] Add implementation of POSIX API wrappers if necessary

`CONFIG_NET_SOCKETS_POSIX_NAMES` has been deprecated in Zephyr
in favor of `CONFIG_POSIX_API`.
`CONFIG_POSIX_API` enables additional functionalities other than
sockets, resulting in increased footprint.
This commit reuses `ZephyrSocket.h` to include Zephyr socket
header and allow building with both configs disabled, adding
neccessary wrappers.

config/zephyr/Kconfig

@@ -30,7 +30,6 @@ menuconfig CHIP
 	imply NET_IPV6
 	imply NET_CONFIG_NEED_IPV6
 	imply NET_SOCKETS
-	imply NET_SOCKETS_POSIX_NAMES if !ARCH_POSIX && CHIP_NRF_PLATFORM
 	imply NETWORKING
 	imply HWINFO
 	imply FLASH

src/include/platform/internal/GenericPlatformManagerImpl_Zephyr.h

@@ -31,7 +31,7 @@
 #endif
 
 #if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#include <zephyr/net/socket.h>
+#include <inet/ZephyrSocket.h>
 #endif
 
 #include <zephyr/kernel.h>

src/inet/BUILD.gn

@@ -78,6 +78,12 @@ source_set("impl_header") {
   public_deps = [ "${chip_root}/src/system:system_config_header" ]
 }
 
+source_set("inet_zephyr_socket") {
+  sources = [ "ZephyrSocket.h" ]
+  public_configs = [ "${chip_root}/src:includes" ]
+  public_deps = [ "${chip_root}/src/system:system_config_header" ]
+}
+
 static_library("inet") {
   output_name = "libInetLayer"
 
@@ -167,12 +173,10 @@ static_library("inet") {
     } else {
       sources += [ "UDPEndPointImpl${chip_system_config_inet}.cpp" ]
     }
+  }
 
-    if (chip_system_config_inet == "Sockets") {
-      # TODO: dependency on this one is not clear as it is only ever
-      #       enabled through CMakeLists.txt. Added here for completeness
-      sources += [ "ZephyrSocket.h" ]
-    }
+  if (chip_system_config_inet == "Sockets") {
+    public_deps += [ ":inet_zephyr_socket" ]
   }
 
   if (chip_with_nlfaultinjection) {

src/inet/IPAddress.h

@@ -63,7 +63,7 @@
 #endif // CHIP_SYSTEM_CONFIG_USE_POSIX_SOCKETS
 
 #if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#include <zephyr/net/socket.h>
+#include "ZephyrSocket.h"
 #endif // CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
 
 #if CHIP_SYSTEM_CONFIG_USE_OPEN_THREAD_ENDPOINT && INET_CONFIG_ENABLE_IPV4

src/inet/UDPEndPointImplSockets.cpp

@@ -40,7 +40,7 @@
 #endif // CHIP_SYSTEM_CONFIG_USE_POSIX_SOCKETS
 
 #if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#include <zephyr/net/socket.h>
+#include "ZephyrSocket.h"
 #endif // CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
 
 #include <cerrno>

src/inet/ZephyrSocket.h

@@ -1,4 +1,4 @@
-#/*
+/*
  *
  *    Copyright (c) 2020 Project CHIP Authors
  *
@@ -17,37 +17,246 @@
 
 /**
  *    @file
- *      This header file defines BSD socket API functions which for various
- *      reasons have not (yet) been implemented or exposed in Zephyr.
+ *      This header file includes Zephyr socket header and implements POSIX wrappers for APIs with
+ * 	`zsock_` prefix if necessary.
  */
 
 #pragma once
 
-#if CHIP_SYSTEM_CONFIG_USE_POSIX_SOCKETS
-#include <sys/select.h>
-#endif
-
-#if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
 #include <zephyr/net/socket.h>
-#endif
 
+#if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES
+extern "C" {
+
+/** POSIX wrapper for @ref zsock_fd_set */
+#define fd_set zsock_fd_set
+/** POSIX wrapper for @ref ZSOCK_FD_SETSIZE */
+#define FD_SETSIZE ZSOCK_FD_SETSIZE
+
+/** POSIX wrapper for @ref ZSOCK_FD_ZERO */
+static inline void FD_ZERO(zsock_fd_set * set)
+{
+    ZSOCK_FD_ZERO(set);
+}
+
+/** POSIX wrapper for @ref ZSOCK_FD_ISSET */
+static inline int FD_ISSET(int fd, zsock_fd_set * set)
+{
+    return ZSOCK_FD_ISSET(fd, set);
+}
+
+/** POSIX wrapper for @ref ZSOCK_FD_CLR */
+static inline void FD_CLR(int fd, zsock_fd_set * set)
+{
+    ZSOCK_FD_CLR(fd, set);
+}
+
+/** POSIX wrapper for @ref ZSOCK_FD_SET */
+static inline void FD_SET(int fd, zsock_fd_set * set)
+{
+    ZSOCK_FD_SET(fd, set);
+}
+
+/** POSIX wrapper for @ref zsock_select */
+static inline int select(int nfds, zsock_fd_set * readfds, zsock_fd_set * writefds, zsock_fd_set * exceptfds,
+                         struct timeval * timeout)
+{
+    return zsock_select(nfds, readfds, writefds, exceptfds, timeout);
+}
+
+/** POSIX wrapper for @ref zsock_pollfd */
+#define pollfd zsock_pollfd
+
+/** POSIX wrapper for @ref zsock_socket */
+static inline int socket(int family, int type, int proto)
+{
+    return zsock_socket(family, type, proto);
+}
+
+/** POSIX wrapper for @ref zsock_socketpair */
+static inline int socketpair(int family, int type, int proto, int sv[2])
+{
+    return zsock_socketpair(family, type, proto, sv);
+}
+
+/** POSIX wrapper for @ref zsock_close */
+static inline int close(int sock)
+{
+    return zsock_close(sock);
+}
+
+/** POSIX wrapper for @ref zsock_shutdown */
+static inline int shutdown(int sock, int how)
+{
+    return zsock_shutdown(sock, how);
+}
+
+/** POSIX wrapper for @ref zsock_bind */
+static inline int bind(int sock, const struct sockaddr * addr, socklen_t addrlen)
+{
+    return zsock_bind(sock, addr, addrlen);
+}
+
+/** POSIX wrapper for @ref zsock_connect */
+static inline int connect(int sock, const struct sockaddr * addr, socklen_t addrlen)
+{
+    return zsock_connect(sock, addr, addrlen);
+}
+
+/** POSIX wrapper for @ref zsock_listen */
+static inline int listen(int sock, int backlog)
+{
+    return zsock_listen(sock, backlog);
+}
+
+/** POSIX wrapper for @ref zsock_accept */
+static inline int accept(int sock, struct sockaddr * addr, socklen_t * addrlen)
+{
+    return zsock_accept(sock, addr, addrlen);
+}
+
+/** POSIX wrapper for @ref zsock_send */
+static inline ssize_t send(int sock, const void * buf, size_t len, int flags)
+{
+    return zsock_send(sock, buf, len, flags);
+}
+
+/** POSIX wrapper for @ref zsock_recv */
+static inline ssize_t recv(int sock, void * buf, size_t max_len, int flags)
+{
+    return zsock_recv(sock, buf, max_len, flags);
+}
+
+/** POSIX wrapper for @ref zsock_sendto */
+static inline ssize_t sendto(int sock, const void * buf, size_t len, int flags, const struct sockaddr * dest_addr,
+                             socklen_t addrlen)
+{
+    return zsock_sendto(sock, buf, len, flags, dest_addr, addrlen);
+}
+
+/** POSIX wrapper for @ref zsock_sendmsg */
+static inline ssize_t sendmsg(int sock, const struct msghdr * message, int flags)
+{
+    return zsock_sendmsg(sock, message, flags);
+}
+
+/** POSIX wrapper for @ref zsock_recvfrom */
+static inline ssize_t recvfrom(int sock, void * buf, size_t max_len, int flags, struct sockaddr * src_addr, socklen_t * addrlen)
+{
+    return zsock_recvfrom(sock, buf, max_len, flags, src_addr, addrlen);
+}
+
+/** POSIX wrapper for @ref zsock_recvmsg */
 static inline ssize_t recvmsg(int sock, struct msghdr * msg, int flags)
 {
-    // Zephyr doesn't implement recvmsg at all, but if the message vector size is > 0 we can simply
-    // translate recvmsg to recvfrom which fills only the first of the provided buffers (although
-    // we don't get control messages in such a case).
+    return zsock_recvmsg(sock, msg, flags);
+}
+
+/** POSIX wrapper for @ref zsock_poll */
+static inline int poll(struct zsock_pollfd * fds, int nfds, int timeout)
+{
+    return zsock_poll(fds, nfds, timeout);
+}
+
+/** POSIX wrapper for @ref zsock_getsockopt */
+static inline int getsockopt(int sock, int level, int optname, void * optval, socklen_t * optlen)
+{
+    return zsock_getsockopt(sock, level, optname, optval, optlen);
+}
 
-    if (msg->msg_iovlen < 1)
-    {
-        errno = EMSGSIZE;
-        return -1;
-    }
+/** POSIX wrapper for @ref zsock_setsockopt */
+static inline int setsockopt(int sock, int level, int optname, const void * optval, socklen_t optlen)
+{
+    return zsock_setsockopt(sock, level, optname, optval, optlen);
+}
 
-    ssize_t ret = recvfrom(sock, msg->msg_iov[0].iov_base, msg->msg_iov[0].iov_len, flags, static_cast<sockaddr *>(msg->msg_name),
-                           &msg->msg_namelen);
+/** POSIX wrapper for @ref zsock_getpeername */
+static inline int getpeername(int sock, struct sockaddr * addr, socklen_t * addrlen)
+{
+    return zsock_getpeername(sock, addr, addrlen);
+}
 
-    if (ret >= 0)
-        msg->msg_controllen = 0;
+/** POSIX wrapper for @ref zsock_getsockname */
+static inline int getsockname(int sock, struct sockaddr * addr, socklen_t * addrlen)
+{
+    return zsock_getsockname(sock, addr, addrlen);
+}
 
-    return ret;
+/** POSIX wrapper for @ref zsock_getaddrinfo */
+static inline int getaddrinfo(const char * host, const char * service, const struct zsock_addrinfo * hints,
+                              struct zsock_addrinfo ** res)
+{
+    return zsock_getaddrinfo(host, service, hints, res);
 }
+
+/** POSIX wrapper for @ref zsock_freeaddrinfo */
+static inline void freeaddrinfo(struct zsock_addrinfo * ai)
+{
+    zsock_freeaddrinfo(ai);
+}
+
+/** POSIX wrapper for @ref zsock_gai_strerror */
+static inline const char * gai_strerror(int errcode)
+{
+    return zsock_gai_strerror(errcode);
+}
+
+/** POSIX wrapper for @ref zsock_getnameinfo */
+static inline int getnameinfo(const struct sockaddr * addr, socklen_t addrlen, char * host, socklen_t hostlen, char * serv,
+                              socklen_t servlen, int flags)
+{
+    return zsock_getnameinfo(addr, addrlen, host, hostlen, serv, servlen, flags);
+}
+
+/** POSIX wrapper for @ref zsock_addrinfo */
+#define addrinfo zsock_addrinfo
+
+/** POSIX wrapper for @ref zsock_gethostname */
+static inline int gethostname(char * buf, size_t len)
+{
+    return zsock_gethostname(buf, len);
+}
+
+/** POSIX wrapper for @ref zsock_inet_pton */
+static inline int inet_pton(sa_family_t family, const char * src, void * dst)
+{
+    return zsock_inet_pton(family, src, dst);
+}
+
+/** POSIX wrapper for @ref zsock_inet_ntop */
+static inline char * inet_ntop(sa_family_t family, const void * src, char * dst, size_t size)
+{
+    return zsock_inet_ntop(family, src, dst, size);
+}
+
+/** POSIX wrapper for @ref ZSOCK_POLLIN */
+#define POLLIN ZSOCK_POLLIN
+/** POSIX wrapper for @ref ZSOCK_POLLOUT */
+#define POLLOUT ZSOCK_POLLOUT
+/** POSIX wrapper for @ref ZSOCK_POLLERR */
+#define POLLERR ZSOCK_POLLERR
+/** POSIX wrapper for @ref ZSOCK_POLLHUP */
+#define POLLHUP ZSOCK_POLLHUP
+/** POSIX wrapper for @ref ZSOCK_POLLNVAL */
+#define POLLNVAL ZSOCK_POLLNVAL
+
+/** POSIX wrapper for @ref ZSOCK_MSG_PEEK */
+#define MSG_PEEK ZSOCK_MSG_PEEK
+/** POSIX wrapper for @ref ZSOCK_MSG_CTRUNC */
+#define MSG_CTRUNC ZSOCK_MSG_CTRUNC
+/** POSIX wrapper for @ref ZSOCK_MSG_TRUNC */
+#define MSG_TRUNC ZSOCK_MSG_TRUNC
+/** POSIX wrapper for @ref ZSOCK_MSG_DONTWAIT */
+#define MSG_DONTWAIT ZSOCK_MSG_DONTWAIT
+/** POSIX wrapper for @ref ZSOCK_MSG_WAITALL */
+#define MSG_WAITALL ZSOCK_MSG_WAITALL
+
+/** POSIX wrapper for @ref ZSOCK_SHUT_RD */
+#define SHUT_RD ZSOCK_SHUT_RD
+/** POSIX wrapper for @ref ZSOCK_SHUT_WR */
+#define SHUT_WR ZSOCK_SHUT_WR
+/** POSIX wrapper for @ref ZSOCK_SHUT_RDWR */
+#define SHUT_RDWR ZSOCK_SHUT_RDWR
+
+} // extern "C"
+#endif // CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES

src/system/BUILD.gn

@@ -272,6 +272,10 @@ static_library("system") {
     sources += [ "SocketEvents.h" ]
   }
 
+  if (chip_system_config_inet == "Sockets") {
+    public_deps += [ "${chip_root}/src/inet:inet_zephyr_socket" ]
+  }
+
   if (chip_with_nlfaultinjection) {
     sources += [
       "SystemFaultInjection.cpp",

src/system/SystemClock.h

@@ -37,7 +37,7 @@
 #endif // CHIP_SYSTEM_CONFIG_USE_POSIX_TIME_FUNCTS || CHIP_SYSTEM_CONFIG_USE_POSIX_SOCKETS
 
 #if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#include <zephyr/net/socket.h>
+#include <inet/ZephyrSocket.h>
 #endif
 
 #include <chrono>

src/system/SystemConfig.h

@@ -733,13 +733,30 @@ struct LwIPEvent;
  *  Defaults to enabled on Zephyr platforms that do not enable Zephyr POSIX layer.
  */
 #ifndef CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#if CHIP_SYSTEM_CONFIG_USE_SOCKETS && defined(__ZEPHYR__) && defined(CONFIG_NET_SOCKETS_POSIX_NAMES)
+#if CHIP_SYSTEM_CONFIG_USE_SOCKETS && defined(__ZEPHYR__) && !defined(CONFIG_POSIX_API)
 #define CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS 1
 #else
 #define CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS 0
 #endif
 #endif // CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
 
+/**
+ *  @def CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES
+ *
+ *  @brief
+ *      Use Zephyr socket API with `zsock_` prefix.
+ *
+ *  Defaults to enabled if `CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS` is enabled,
+ *  but `CONFIG_NET_SOCKETS_POSIX_NAMES` is disabled.
+ */
+#ifndef CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES
+#if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS && !defined(CONFIG_NET_SOCKETS_POSIX_NAMES)
+#define CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES 1
+#else
+#define CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES 0
+#endif
+#endif // CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKET_NAMES
+
 /**
  *  @def CHIP_SYSTEM_CONFIG_USE_POSIX_SOCKETS
  *

src/system/SystemLayerImplSelect.h

@@ -29,7 +29,7 @@
 #endif
 
 #if CHIP_SYSTEM_CONFIG_USE_ZEPHYR_SOCKETS
-#include <zephyr/net/socket.h>
+#include <inet/ZephyrSocket.h>
 #endif
 
 #if CHIP_SYSTEM_CONFIG_POSIX_LOCKING