net/ and include/nuttx/net: Add getpeername() support

include/nuttx/net/net.h

@@ -155,6 +155,8 @@ struct sock_intf_s
                     FAR const struct sockaddr *addr, socklen_t addrlen);
   CODE int        (*si_getsockname)(FAR struct socket *psock,
                     FAR struct sockaddr *addr, FAR socklen_t *addrlen);
+  CODE int        (*si_getpeername)(FAR struct socket *psock,
+                    FAR struct sockaddr *addr, FAR socklen_t *addrlen);
   CODE int        (*si_listen)(FAR struct socket *psock, int backlog);
   CODE int        (*si_connect)(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
@@ -1068,6 +1070,44 @@ int psock_getsockopt(FAR struct socket *psock, int level, int option,
 int psock_setsockopt(FAR struct socket *psock, int level, int option,
                      FAR const void *value, socklen_t value_len);
 
+/****************************************************************************
+ * Name: psock_getpeername
+ *
+ * Description:
+ *   The psock_getpeername() function retrieves the remote-connected name of
+ *   the specified socket, stores this address in the sockaddr structure
+ *   pointed to by the 'addr' argument, and stores the length of this address
+ *   in the object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of socket to operate on
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address. Otherwise, -1 is returned and errno is set to indicate the error.
+ *   Possible errno values that may be returned include:
+ *
+ *   EBADF      - The socket argument is not a valid file descriptor.
+ *   ENOTSOCK   - The socket argument does not refer to a socket.
+ *   EOPNOTSUPP - The operation is not supported for this socket's protocol.
+ *   EINVAL     - The socket has been shut down.
+ *   ENOBUFS    - Insufficient resources were available in the system to
+ *                complete the function.
+ *
+ ****************************************************************************/
+
+int psock_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr,
+                      FAR socklen_t *addrlen);
+
 /****************************************************************************
  * Name: psock_ioctl
  *

include/sys/socket.h

@@ -298,6 +298,8 @@ int getsockopt(int sockfd, int level, int option,
 
 int getsockname(int sockfd, FAR struct sockaddr *addr,
                 FAR socklen_t *addrlen);
+int getpeername(int sockfd, FAR struct sockaddr *addr,
+                FAR socklen_t *addrlen);
 
 #undef EXTERN
 #if defined(__cplusplus)

net/bluetooth/bluetooth_sockif.c

@@ -98,6 +98,7 @@ const struct sock_intf_s g_bluetooth_sockif =
   bluetooth_addref,      /* si_addref */
   bluetooth_bind,        /* si_bind */
   bluetooth_getsockname, /* si_getsockname */
+  bluetooth_getpeername, /* si_getpeername */
   bluetooth_listen,      /* si_listen */
   bluetooth_connect,     /* si_connect */
   bluetooth_accept,      /* si_accept */
@@ -505,6 +506,68 @@ static int bluetooth_getsockname(FAR struct socket *psock,
   return OK;
 }
 
+/****************************************************************************
+ * Name: bluetooth_getpeername
+ *
+ * Description:
+ *   The bluetooth_getpeername() function retrieves the remote-connected name of
+ *   the specified local socket, stores this address in the sockaddr
+ *   structure pointed to by the 'addr' argument, and stores the length of
+ *   this address in the object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of the socket to be queried
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address.  Otherwise, a negated errno value is returned.  See
+ *   getpeername() for the list of appropriate error numbers.
+ *
+ ****************************************************************************/
+
+static int bluetooth_getpeername(FAR struct socket *psock,
+                                 FAR struct sockaddr *addr,
+                                 FAR socklen_t *addrlen)
+{
+  FAR struct bluetooth_conn_s *conn;
+  FAR struct sockaddr_bt_s tmp;
+  socklen_t copylen;
+
+  DEBUGASSERT(psock != NULL && addr != NULL && addrlen != NULL);
+
+  conn = (FAR struct bluetooth_conn_s *)psock->s_conn;
+  DEBUGASSERT(conn != NULL);
+
+  /* Create a copy of the full address on the stack */
+
+  tmp.bt_family = AF_BLUETOOTH;
+  memcpy(&tmp.bt_bdaddr, &conn->bc_raddr, sizeof(bt_addr_t));
+
+  /* Copy to the user buffer, truncating if necessary */
+
+  copylen = sizeof(struct sockaddr_bt_s);
+  if (copylen > *addrlen)
+    {
+      copylen = *addrlen;
+    }
+
+  memcpy(addr, &tmp, copylen);
+
+  /* Return the actual size transferred */
+
+  *addrlen = copylen;
+  return OK;
+}
+
 /****************************************************************************
  * Name: bluetooth_listen
  *

net/icmp/icmp_sockif.c

@@ -66,6 +66,8 @@ static int        icmp_bind(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
 static int        icmp_getsockname(FAR struct socket *psock,
                     FAR struct sockaddr *addr, FAR socklen_t *addrlen);
+static int        icmp_getpeername(FAR struct socket *psock,
+                    FAR struct sockaddr *addr, FAR socklen_t *addrlen);
 static int        icmp_listen(FAR struct socket *psock, int backlog);
 static int        icmp_connect(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
@@ -91,6 +93,7 @@ const struct sock_intf_s g_icmp_sockif =
   icmp_addref,      /* si_addref */
   icmp_bind,        /* si_bind */
   icmp_getsockname, /* si_getsockname */
+  icmp_getpeername, /* si_getpeername */
   icmp_listen,      /* si_listen */
   icmp_connect,     /* si_connect */
   icmp_accept,      /* si_accept */
@@ -361,6 +364,40 @@ static int icmp_getsockname(FAR struct socket *psock,
   return -EAFNOSUPPORT;
 }
 
+/****************************************************************************
+ * Name: icmp_getpeername
+ *
+ * Description:
+ *   The icmp_getpeername() function retrieves the remote-connected name of the
+ *   specified packet socket, stores this address in the sockaddr structure
+ *   pointed to by the 'addr' argument, and stores the length of this
+ *   address in the object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of the socket to be queried
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address.  Otherwise, a negated errno value is returned.  See
+ *   getpeername() for the list of appropriate error numbers.
+ *
+ ****************************************************************************/
+
+static int icmp_getpeername(FAR struct socket *psock,
+                           FAR struct sockaddr *addr, FAR socklen_t *addrlen)
+{
+  return -EAFNOSUPPORT;
+}
+
 /****************************************************************************
  * Name: icmp_listen
  *

net/icmpv6/icmpv6_sockif.c

@@ -66,6 +66,8 @@ static int        icmpv6_bind(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
 static int        icmpv6_getsockname(FAR struct socket *psock,
                     FAR struct sockaddr *addr, FAR socklen_t *addrlen);
+static int        icmpv6_getpeername(FAR struct socket *psock,
+                    FAR struct sockaddr *addr, FAR socklen_t *addrlen);
 static int        icmpv6_listen(FAR struct socket *psock, int backlog);
 static int        icmpv6_connect(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
@@ -91,6 +93,7 @@ const struct sock_intf_s g_icmpv6_sockif =
   icmpv6_addref,      /* si_addref */
   icmpv6_bind,        /* si_bind */
   icmpv6_getsockname, /* si_getsockname */
+  icmpv6_getpeername, /* si_getpeername */
   icmpv6_listen,      /* si_listen */
   icmpv6_connect,     /* si_connect */
   icmpv6_accept,      /* si_accept */
@@ -361,6 +364,40 @@ static int icmpv6_getsockname(FAR struct socket *psock,
   return -EAFNOSUPPORT;
 }
 
+/****************************************************************************
+ * Name: icmpv6_getpeername
+ *
+ * Description:
+ *   The icmpv6_getpeername() function retrieves the remote-connected name of the
+ *   specified packet socket, stores this address in the sockaddr structure
+ *   pointed to by the 'addr' argument, and stores the length of this
+ *   address in the object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of the socket to be queried
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address.  Otherwise, a negated errno value is returned.  See
+ *   getpeername() for the list of appropriate error numbers.
+ *
+ ****************************************************************************/
+
+static int icmpv6_getpeername(FAR struct socket *psock,
+                           FAR struct sockaddr *addr, FAR socklen_t *addrlen)
+{
+  return -EAFNOSUPPORT;
+}
+
 /****************************************************************************
  * Name: icmpv6_listen
  *

net/ieee802154/ieee802154_sockif.c

@@ -68,6 +68,8 @@ static int        ieee802154_bind(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
 static int        ieee802154_getsockname(FAR struct socket *psock,
                     FAR struct sockaddr *addr, FAR socklen_t *addrlen);
+static int        ieee802154_getpeername(FAR struct socket *psock,
+                    FAR struct sockaddr *addr, FAR socklen_t *addrlen);
 static int        ieee802154_listen(FAR struct socket *psock, int backlog);
 static int        ieee802154_connect(FAR struct socket *psock,
                     FAR const struct sockaddr *addr, socklen_t addrlen);
@@ -96,6 +98,7 @@ const struct sock_intf_s g_ieee802154_sockif =
   ieee802154_addref,      /* si_addref */
   ieee802154_bind,        /* si_bind */
   ieee802154_getsockname, /* si_getsockname */
+  ieee802154_getpeername, /* si_getpeername */
   ieee802154_listen,      /* si_listen */
   ieee802154_connect,     /* si_connect */
   ieee802154_accept,      /* si_accept */
@@ -512,6 +515,68 @@ static int ieee802154_getsockname(FAR struct socket *psock,
   return OK;
 }
 
+/****************************************************************************
+ * Name: ieee802154_getpeername
+ *
+ * Description:
+ *   The ieee802154_getpeername() function retrieves the remote-connectd name of the
+ *   specified packet socket, stores this address in the sockaddr structure
+ *   pointed to by the 'addr' argument, and stores the length of this
+ *   address in the object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of the socket to be queried
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address.  Otherwise, a negated errno value is returned.  See
+ *   getpeername() for the list of appropriate error numbers.
+ *
+ ****************************************************************************/
+
+static int ieee802154_getpeername(FAR struct socket *psock,
+                                  FAR struct sockaddr *addr, FAR
+                                  socklen_t *addrlen)
+{
+  FAR struct ieee802154_conn_s *conn;
+  FAR struct sockaddr_ieee802154_s tmp;
+  socklen_t copylen;
+
+  DEBUGASSERT(psock != NULL && addr != NULL && addrlen != NULL);
+
+  conn = (FAR struct ieee802154_conn_s *)psock->s_conn;
+  DEBUGASSERT(conn != NULL);
+
+  /* Create a copy of the full address on the stack */
+
+  tmp.sa_family = PF_IEEE802154;
+  memcpy(&tmp.sa_addr, &conn->raddr, sizeof(struct ieee802154_saddr_s));
+
+  /* Copy to the user buffer, truncating if necessary */
+
+  copylen = sizeof(struct sockaddr_ieee802154_s);
+  if (copylen > *addrlen)
+    {
+      copylen = *addrlen;
+    }
+
+  memcpy(addr, &tmp, copylen);
+
+  /* Return the actual size transferred */
+
+  *addrlen = copylen;
+  return OK;
+}
+
 /****************************************************************************
  * Name: ieee802154_listen
  *

net/inet/Make.defs

@@ -44,11 +44,11 @@ SOCK_CSRCS += inet_globals.c
 endif
 
 ifeq ($(CONFIG_NET_IPv4),y)
-SOCK_CSRCS += ipv4_getsockname.c inet_setipid.c
+SOCK_CSRCS += ipv4_getsockname.c ipv4_getpeername.c inet_setipid.c
 endif
 
 ifeq ($(CONFIG_NET_IPv6),y)
-SOCK_CSRCS += ipv6_getsockname.c
+SOCK_CSRCS += ipv6_getsockname.c ipv6_getpeername.c
 endif
 
 # Include inet build support

net/inet/inet.h

@@ -171,6 +171,35 @@ int ipv6_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
                      FAR socklen_t *addrlen);
 #endif
 
+/****************************************************************************
+ * Name: ipv4_getpeername and ipv6_peername
+ *
+ * Description:
+ *   The ipv4_getpeername() and ipv6_getsocknam() function retrieve the
+ *   remote-connected name of the specified INET socket.
+ *
+ * Parameters:
+ *   psock    Point to the socket structure instance [in]
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address.  Otherwise, a negated errno value is returned.  See
+ *   getpeername() for the list of returned error values.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_IPv4
+int ipv4_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr,
+                     FAR socklen_t *addrlen);
+#endif
+#ifdef CONFIG_NET_IPv6
+int ipv6_getpeername(FAR struct socket *psock, FAR struct sockaddr *addr,
+                     FAR socklen_t *addrlen);
+#endif
+
 /****************************************************************************
  * Name: inet_recvfrom
  *