posix: add networking apis

doc/services/portability/posix/aep/index.rst

@@ -139,7 +139,7 @@ Dedicated Realtime System Profile (PSE53)
     POSIX_FILE_LOCKING,,
     POSIX_FILE_SYSTEM,,
     POSIX_MULTI_PROCESS,, :ref:`†<posix_undefined_behaviour>`
-    POSIX_NETWORKING, yes, :ref:`†<posix_undefined_behaviour>`
+    POSIX_NETWORKING, yes, :ref:`POSIX_NETWORKING <posix_option_group_networking>`
     POSIX_PIPE,, :ref:`†<posix_undefined_behaviour>`
     POSIX_SIGNALS,, :ref:`†<posix_undefined_behaviour>`
     POSIX_SIGNAL_JUMP,, :ref:`†<posix_undefined_behaviour>`

doc/services/portability/posix/option_groups/index.rst

@@ -289,6 +289,70 @@ POSIX_CLOCK_SELECTION
     pthread_condattr_setclock(),yes
     clock_nanosleep(),yes
 
+.. _posix_option_group_networking:
+
+POSIX_NETWORKING
+================
+
+.. csv-table:: POSIX_NETWORKING
+   :header: API, Supported
+   :widths: 50,10
+
+    accept(),yes
+    bind(),yes
+    connect(),yes
+    endhostent(),yes
+    endnetent(),yes
+    endprotoent(),yes
+    endservent(),yes
+    freeaddrinfo(),yes
+    gai_strerror(),yes
+    getaddrinfo(),yes
+    gethostent(),yes
+    gethostname(),yes
+    getnameinfo(),yes
+    getnetbyaddr(),yes
+    getnetbyname(),yes
+    getnetent(),yes
+    getpeername(),yes
+    getprotobyname(),yes
+    getprotobynumber(),yes
+    getprotoent(),yes
+    getservbyname(),yes
+    getservbyport(),yes
+    getservent(),yes
+    getsockname(),yes
+    getsockopt(),yes
+    htonl(),yes
+    htons(),yes
+    if_freenameindex(),yes
+    if_indextoname(),yes
+    if_nameindex(),yes
+    if_nametoindex(),yes
+    inet_addr(),yes
+    inet_ntoa(),yes
+    inet_ntop(),yes
+    inet_pton(),yes
+    listen(),yes
+    ntohl(),yes
+    ntohs(),yes
+    recv(),yes
+    recvfrom(),yes
+    recvmsg(),yes
+    send(),yes
+    sendmsg(),yes
+    sendto(),yes
+    sethostent(),yes
+    setnetent(),yes
+    setprotoent(),yes
+    setservent(),yes
+    setsockopt(),yes
+    shutdown(),yes
+    socket(),yes
+    sockatmark(),yes (will fail with ``ENOSYS``:ref:`†<posix_undefined_behaviour>`)
+    socketpair(),yes
+
+
 .. _posix_option_group_semaphores:
 
 POSIX_SEMAPHORES

include/zephyr/posix/arpa/inet.h

@@ -32,6 +32,9 @@ static inline int inet_pton(sa_family_t family, const char *src, void *dst)
 
 #endif /* CONFIG_NET_SOCKETS_POSIX_NAMES */
 
+in_addr_t inet_addr(const char *cp);
+char *inet_ntoa(struct in_addr in);
+
 #ifdef __cplusplus
 }
 #endif

include/zephyr/posix/net/if.h

@@ -6,12 +6,26 @@
 #ifndef ZEPHYR_INCLUDE_POSIX_NET_IF_H_
 #define ZEPHYR_INCLUDE_POSIX_NET_IF_H_
 
-#include <zephyr/net/socket.h>
+#ifdef CONFIG_NET_INTERFACE_NAME_LEN
+#define IF_NAMESIZE CONFIG_NET_INTERFACE_NAME_LEN
+#else
+#define IF_NAMESIZE 1
+#endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+struct if_nameindex {
+	unsigned int if_index;
+	char *if_name;
+};
+
+char *if_indextoname(unsigned int ifindex, char *ifname);
+void if_freenameindex(struct if_nameindex *ptr);
+struct if_nameindex *if_nameindex(void);
+unsigned int if_nametoindex(const char *ifname);
+
 #ifdef __cplusplus
 }
 #endif

include/zephyr/posix/netdb.h

@@ -29,6 +29,34 @@
 extern "C" {
 #endif
 
+struct hostent {
+	char *h_name;
+	char **h_aliases;
+	int h_addrtype;
+	int h_length;
+	char **h_addr_list;
+};
+
+struct netent {
+	char *n_name;
+	char **n_aliases;
+	int n_addrtype;
+	uint32_t n_net;
+};
+
+struct protoent {
+	char *p_name;
+	char **p_aliases;
+	int p_proto;
+};
+
+struct servent {
+	char *s_name;
+	char **s_aliases;
+	int s_port;
+	char *s_proto;
+};
+
 #ifndef CONFIG_NET_SOCKETS_POSIX_NAMES
 
 #define addrinfo zsock_addrinfo
@@ -60,6 +88,25 @@ static inline int getnameinfo(const struct sockaddr *addr, socklen_t addrlen,
 
 #endif /* CONFIG_NET_SOCKETS_POSIX_NAMES */
 
+void endhostent(void);
+void endnetent(void);
+void endprotoent(void);
+void endservent(void);
+struct hostent *gethostent(void);
+struct netent *getnetbyaddr(uint32_t net, int type);
+struct netent *getnetbyname(const char *name);
+struct netent *getnetent(void);
+struct protoent *getprotobyname(const char *name);
+struct protoent *getprotobynumber(int proto);
+struct protoent *getprotoent(void);
+struct servent *getservbyname(const char *name, const char *proto);
+struct servent *getservbyport(int port, const char *proto);
+struct servent *getservent(void);
+void sethostent(int stayopen);
+void setnetent(int stayopen);
+void setprotoent(int stayopen);
+void setservent(int stayopen);
+
 #ifdef __cplusplus
 }
 #endif

include/zephyr/posix/sys/socket.h

@@ -125,6 +125,8 @@ static inline int getsockname(int sock, struct sockaddr *addr,
 
 #endif /* CONFIG_NET_SOCKETS_POSIX_NAMES */
 
+int sockatmark(int s);
+
 #ifdef __cplusplus
 }
 #endif

lib/posix/options/CMakeLists.txt

@@ -44,6 +44,7 @@ zephyr_library_sources_ifdef(CONFIG_POSIX_CONFSTR confstr.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_ENV env.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_FS fs.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_MQUEUE mqueue.c)
+zephyr_library_sources_ifdef(CONFIG_POSIX_NETWORKING net.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_PUTMSG stropts.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_SIGNAL signal.c ${STRSIGNAL_TABLE_H})
 zephyr_library_sources_ifdef(CONFIG_POSIX_SYSCONF_IMPL_FULL sysconf.c)

lib/posix/options/Kconfig

@@ -37,6 +37,7 @@ rsource "Kconfig.getopt"
 rsource "Kconfig.key"
 rsource "Kconfig.mqueue"
 rsource "Kconfig.mutex"
+rsource "Kconfig.net"
 rsource "Kconfig.pthread"
 rsource "Kconfig.rwlock"
 rsource "Kconfig.sched"

lib/posix/options/Kconfig.net

@@ -0,0 +1,11 @@
+# Copyright (c) 2024, Friedt Professional Engineering Services, Inc
+#
+# SPDX-License-Identifier: Apache-2.0
+
+config POSIX_NETWORKING
+	bool "POSIX Networking API"
+	default y if POSIX_API
+	depends on NETWORKING
+	help
+	  Enable this option to support the POSIX networking API. This includes
+	  support for BSD Sockets.