------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- G N A T . S O C K E T S -- -- -- -- B o d y -- -- -- -- Copyright (C) 2001-2016, AdaCore -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Ada.Streams; use Ada.Streams; with Ada.Exceptions; use Ada.Exceptions; with Ada.Finalization; with Ada.Unchecked_Conversion; with GNAT.Sockets.Thin_Common; use GNAT.Sockets.Thin_Common; with GNAT.Sockets.Thin; use GNAT.Sockets.Thin; with GNAT.Sockets.Linker_Options; pragma Warnings (Off, GNAT.Sockets.Linker_Options); -- Need to include pragma Linker_Options which is platform dependent with System; use System; with System.Communication; use System.Communication; with System.CRTL; use System.CRTL; with System.Task_Lock; package body GNAT.Sockets is package C renames Interfaces.C; use type C.int; ENOERROR : constant := 0; Netdb_Buffer_Size : constant := SOSC.Need_Netdb_Buffer * 1024; Need_Netdb_Lock : constant Boolean := SOSC.Need_Netdb_Lock /= 0; -- The network database functions gethostbyname, gethostbyaddr, -- getservbyname and getservbyport can either be guaranteed task safe by -- the operating system, or else return data through a user-provided buffer -- to ensure concurrent uses do not interfere. -- Correspondence tables Levels : constant array (Level_Type) of C.int := (Socket_Level => SOSC.SOL_SOCKET, IP_Protocol_For_IP_Level => SOSC.IPPROTO_IP, IP_Protocol_For_UDP_Level => SOSC.IPPROTO_UDP, IP_Protocol_For_TCP_Level => SOSC.IPPROTO_TCP); Modes : constant array (Mode_Type) of C.int := (Socket_Stream => SOSC.SOCK_STREAM, Socket_Datagram => SOSC.SOCK_DGRAM); Shutmodes : constant array (Shutmode_Type) of C.int := (Shut_Read => SOSC.SHUT_RD, Shut_Write => SOSC.SHUT_WR, Shut_Read_Write => SOSC.SHUT_RDWR); Requests : constant array (Request_Name) of SOSC.IOCTL_Req_T := (Non_Blocking_IO => SOSC.FIONBIO, N_Bytes_To_Read => SOSC.FIONREAD); Options : constant array (Option_Name) of C.int := (Keep_Alive => SOSC.SO_KEEPALIVE, Reuse_Address => SOSC.SO_REUSEADDR, Broadcast => SOSC.SO_BROADCAST, Send_Buffer => SOSC.SO_SNDBUF, Receive_Buffer => SOSC.SO_RCVBUF, Linger => SOSC.SO_LINGER, Error => SOSC.SO_ERROR, No_Delay => SOSC.TCP_NODELAY, Add_Membership => SOSC.IP_ADD_MEMBERSHIP, Drop_Membership => SOSC.IP_DROP_MEMBERSHIP, Multicast_If => SOSC.IP_MULTICAST_IF, Multicast_TTL => SOSC.IP_MULTICAST_TTL, Multicast_Loop => SOSC.IP_MULTICAST_LOOP, Receive_Packet_Info => SOSC.IP_PKTINFO, Send_Timeout => SOSC.SO_SNDTIMEO, Receive_Timeout => SOSC.SO_RCVTIMEO); -- ??? Note: for OpenSolaris, Receive_Packet_Info should be IP_RECVPKTINFO, -- but for Linux compatibility this constant is the same as IP_PKTINFO. Flags : constant array (0 .. 3) of C.int := (0 => SOSC.MSG_OOB, -- Process_Out_Of_Band_Data 1 => SOSC.MSG_PEEK, -- Peek_At_Incoming_Data 2 => SOSC.MSG_WAITALL, -- Wait_For_A_Full_Reception 3 => SOSC.MSG_EOR); -- Send_End_Of_Record Socket_Error_Id : constant Exception_Id := Socket_Error'Identity; Host_Error_Id : constant Exception_Id := Host_Error'Identity; Hex_To_Char : constant String (1 .. 16) := "0123456789ABCDEF"; -- Use to print in hexadecimal format ----------------------- -- Local subprograms -- ----------------------- function Resolve_Error (Error_Value : Integer; From_Errno : Boolean := True) return Error_Type; -- Associate an enumeration value (error_type) to an error value (errno). -- From_Errno prevents from mixing h_errno with errno. function To_Name (N : String) return Name_Type; function To_String (HN : Name_Type) return String; -- Conversion functions function To_Int (F : Request_Flag_Type) return C.int; -- Return the int value corresponding to the specified flags combination function Set_Forced_Flags (F : C.int) return C.int; -- Return F with the bits from SOSC.MSG_Forced_Flags forced set function Short_To_Network (S : C.unsigned_short) return C.unsigned_short; pragma Inline (Short_To_Network); -- Convert a port number into a network port number function Network_To_Short (S : C.unsigned_short) return C.unsigned_short renames Short_To_Network; -- Symmetric operation function Image (Val : Inet_Addr_VN_Type; Hex : Boolean := False) return String; -- Output an array of inet address components in hex or decimal mode function Is_IP_Address (Name : String) return Boolean; -- Return true when Name is an IP address in standard dot notation procedure Netdb_Lock; pragma Inline (Netdb_Lock); procedure Netdb_Unlock; pragma Inline (Netdb_Unlock); -- Lock/unlock operation used to protect netdb access for platforms that -- require such protection. function To_In_Addr (Addr : Inet_Addr_Type) return In_Addr; procedure To_Inet_Addr (Addr : In_Addr; Result : out Inet_Addr_Type); -- Conversion functions function To_Host_Entry (E : Hostent_Access) return Host_Entry_Type; -- Conversion function function To_Service_Entry (E : Servent_Access) return Service_Entry_Type; -- Conversion function function Value (S : System.Address) return String; -- Same as Interfaces.C.Strings.Value but taking a System.Address function To_Timeval (Val : Timeval_Duration) return Timeval; -- Separate Val in seconds and microseconds function To_Duration (Val : Timeval) return Timeval_Duration; -- Reconstruct a Duration value from a Timeval record (seconds and -- microseconds). procedure Raise_Socket_Error (Error : Integer); -- Raise Socket_Error with an exception message describing the error code -- from errno. procedure Raise_Host_Error (H_Error : Integer; Name : String); -- Raise Host_Error exception with message describing error code (note -- hstrerror seems to be obsolete) from h_errno. Name is the name -- or address that was being looked up. procedure Narrow (Item : in out Socket_Set_Type); -- Update Last as it may be greater than the real last socket procedure Check_For_Fd_Set (Fd : Socket_Type); pragma Inline (Check_For_Fd_Set); -- Raise Constraint_Error if Fd is less than 0 or greater than or equal to -- FD_SETSIZE, on platforms where fd_set is a bitmap. function Connect_Socket (Socket : Socket_Type; Server : Sock_Addr_Type) return C.int; pragma Inline (Connect_Socket); -- Underlying implementation for the Connect_Socket procedures -- Types needed for Datagram_Socket_Stream_Type type Datagram_Socket_Stream_Type is new Root_Stream_Type with record Socket : Socket_Type; To : Sock_Addr_Type; From : Sock_Addr_Type; end record; type Datagram_Socket_Stream_Access is access all Datagram_Socket_Stream_Type; procedure Read (Stream : in out Datagram_Socket_Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset); procedure Write (Stream : in out Datagram_Socket_Stream_Type; Item : Ada.Streams.Stream_Element_Array); -- Types needed for Stream_Socket_Stream_Type type Stream_Socket_Stream_Type is new Root_Stream_Type with record Socket : Socket_Type; end record; type Stream_Socket_Stream_Access is access all Stream_Socket_Stream_Type; procedure Read (Stream : in out Stream_Socket_Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset); procedure Write (Stream : in out Stream_Socket_Stream_Type; Item : Ada.Streams.Stream_Element_Array); procedure Wait_On_Socket (Socket : Socket_Type; For_Read : Boolean; Timeout : Selector_Duration; Selector : access Selector_Type := null; Status : out Selector_Status); -- Common code for variants of socket operations supporting a timeout: -- block in Check_Selector on Socket for at most the indicated timeout. -- If For_Read is True, Socket is added to the read set for this call, else -- it is added to the write set. If no selector is provided, a local one is -- created for this call and destroyed prior to returning. type Sockets_Library_Controller is new Ada.Finalization.Limited_Controlled with null record; -- This type is used to generate automatic calls to Initialize and Finalize -- during the elaboration and finalization of this package. A single object -- of this type must exist at library level. function Err_Code_Image (E : Integer) return String; -- Return the value of E surrounded with brackets procedure Initialize (X : in out Sockets_Library_Controller); procedure Finalize (X : in out Sockets_Library_Controller); procedure Normalize_Empty_Socket_Set (S : in out Socket_Set_Type); -- If S is the empty set (detected by Last = No_Socket), make sure its -- fd_set component is actually cleared. Note that the case where it is -- not can occur for an uninitialized Socket_Set_Type object. function Is_Open (S : Selector_Type) return Boolean; -- Return True for an "open" Selector_Type object, i.e. one for which -- Create_Selector has been called and Close_Selector has not been called, -- or the null selector. --------- -- "+" -- --------- function "+" (L, R : Request_Flag_Type) return Request_Flag_Type is begin return L or R; end "+"; -------------------- -- Abort_Selector -- -------------------- procedure Abort_Selector (Selector : Selector_Type) is Res : C.int; begin if not Is_Open (Selector) then raise Program_Error with "closed selector"; elsif Selector.Is_Null then raise Program_Error with "null selector"; end if; -- Send one byte to unblock select system call Res := Signalling_Fds.Write (C.int (Selector.W_Sig_Socket)); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Abort_Selector; ------------------- -- Accept_Socket -- ------------------- procedure Accept_Socket (Server : Socket_Type; Socket : out Socket_Type; Address : out Sock_Addr_Type) is Res : C.int; Sin : aliased Sockaddr_In; Len : aliased C.int := Sin'Size / 8; begin Res := C_Accept (C.int (Server), Sin'Address, Len'Access); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Socket := Socket_Type (Res); To_Inet_Addr (Sin.Sin_Addr, Address.Addr); Address.Port := Port_Type (Network_To_Short (Sin.Sin_Port)); end Accept_Socket; ------------------- -- Accept_Socket -- ------------------- procedure Accept_Socket (Server : Socket_Type; Socket : out Socket_Type; Address : out Sock_Addr_Type; Timeout : Selector_Duration; Selector : access Selector_Type := null; Status : out Selector_Status) is begin if Selector /= null and then not Is_Open (Selector.all) then raise Program_Error with "closed selector"; end if; -- Wait for socket to become available for reading Wait_On_Socket (Socket => Server, For_Read => True, Timeout => Timeout, Selector => Selector, Status => Status); -- Accept connection if available if Status = Completed then Accept_Socket (Server, Socket, Address); else Socket := No_Socket; end if; end Accept_Socket; --------------- -- Addresses -- --------------- function Addresses (E : Host_Entry_Type; N : Positive := 1) return Inet_Addr_Type is begin return E.Addresses (N); end Addresses; ---------------------- -- Addresses_Length -- ---------------------- function Addresses_Length (E : Host_Entry_Type) return Natural is begin return E.Addresses_Length; end Addresses_Length; ------------- -- Aliases -- ------------- function Aliases (E : Host_Entry_Type; N : Positive := 1) return String is begin return To_String (E.Aliases (N)); end Aliases; ------------- -- Aliases -- ------------- function Aliases (S : Service_Entry_Type; N : Positive := 1) return String is begin return To_String (S.Aliases (N)); end Aliases; -------------------- -- Aliases_Length -- -------------------- function Aliases_Length (E : Host_Entry_Type) return Natural is begin return E.Aliases_Length; end Aliases_Length; -------------------- -- Aliases_Length -- -------------------- function Aliases_Length (S : Service_Entry_Type) return Natural is begin return S.Aliases_Length; end Aliases_Length; ----------------- -- Bind_Socket -- ----------------- procedure Bind_Socket (Socket : Socket_Type; Address : Sock_Addr_Type) is Res : C.int; Sin : aliased Sockaddr_In; Len : constant C.int := Sin'Size / 8; -- This assumes that Address.Family = Family_Inet??? begin if Address.Family = Family_Inet6 then raise Socket_Error with "IPv6 not supported"; end if; Set_Family (Sin.Sin_Family, Address.Family); Set_Address (Sin'Unchecked_Access, To_In_Addr (Address.Addr)); Set_Port (Sin'Unchecked_Access, Short_To_Network (C.unsigned_short (Address.Port))); Res := C_Bind (C.int (Socket), Sin'Address, Len); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Bind_Socket; ---------------------- -- Check_For_Fd_Set -- ---------------------- procedure Check_For_Fd_Set (Fd : Socket_Type) is use SOSC; begin -- On Windows, fd_set is a FD_SETSIZE array of socket ids: -- no check required. Warnings suppressed because condition -- is known at compile time. if Target_OS = Windows then return; -- On other platforms, fd_set is an FD_SETSIZE bitmap: check -- that Fd is within range (otherwise behavior is undefined). elsif Fd < 0 or else Fd >= SOSC.FD_SETSIZE then raise Constraint_Error with "invalid value for socket set: " & Image (Fd); end if; end Check_For_Fd_Set; -------------------- -- Check_Selector -- -------------------- procedure Check_Selector (Selector : Selector_Type; R_Socket_Set : in out Socket_Set_Type; W_Socket_Set : in out Socket_Set_Type; Status : out Selector_Status; Timeout : Selector_Duration := Forever) is E_Socket_Set : Socket_Set_Type; begin Check_Selector (Selector, R_Socket_Set, W_Socket_Set, E_Socket_Set, Status, Timeout); end Check_Selector; procedure Check_Selector (Selector : Selector_Type; R_Socket_Set : in out Socket_Set_Type; W_Socket_Set : in out Socket_Set_Type; E_Socket_Set : in out Socket_Set_Type; Status : out Selector_Status; Timeout : Selector_Duration := Forever) is Res : C.int; Last : C.int; RSig : Socket_Type := No_Socket; TVal : aliased Timeval; TPtr : Timeval_Access; begin if not Is_Open (Selector) then raise Program_Error with "closed selector"; end if; Status := Completed; -- No timeout or Forever is indicated by a null timeval pointer if Timeout = Forever then TPtr := null; else TVal := To_Timeval (Timeout); TPtr := TVal'Unchecked_Access; end if; -- Add read signalling socket, if present if not Selector.Is_Null then RSig := Selector.R_Sig_Socket; Set (R_Socket_Set, RSig); end if; Last := C.int'Max (C.int'Max (C.int (R_Socket_Set.Last), C.int (W_Socket_Set.Last)), C.int (E_Socket_Set.Last)); -- Zero out fd_set for empty Socket_Set_Type objects Normalize_Empty_Socket_Set (R_Socket_Set); Normalize_Empty_Socket_Set (W_Socket_Set); Normalize_Empty_Socket_Set (E_Socket_Set); Res := C_Select (Last + 1, R_Socket_Set.Set'Access, W_Socket_Set.Set'Access, E_Socket_Set.Set'Access, TPtr); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; -- If Select was resumed because of read signalling socket, read this -- data and remove socket from set. if RSig /= No_Socket and then Is_Set (R_Socket_Set, RSig) then Clear (R_Socket_Set, RSig); Res := Signalling_Fds.Read (C.int (RSig)); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Status := Aborted; elsif Res = 0 then Status := Expired; end if; -- Update socket sets in regard to their new contents Narrow (R_Socket_Set); Narrow (W_Socket_Set); Narrow (E_Socket_Set); end Check_Selector; ----------- -- Clear -- ----------- procedure Clear (Item : in out Socket_Set_Type; Socket : Socket_Type) is Last : aliased C.int := C.int (Item.Last); begin Check_For_Fd_Set (Socket); if Item.Last /= No_Socket then Remove_Socket_From_Set (Item.Set'Access, C.int (Socket)); Last_Socket_In_Set (Item.Set'Access, Last'Unchecked_Access); Item.Last := Socket_Type (Last); end if; end Clear; -------------------- -- Close_Selector -- -------------------- procedure Close_Selector (Selector : in out Selector_Type) is begin -- Nothing to do if selector already in closed state if Selector.Is_Null or else not Is_Open (Selector) then return; end if; -- Close the signalling file descriptors used internally for the -- implementation of Abort_Selector. Signalling_Fds.Close (C.int (Selector.R_Sig_Socket)); Signalling_Fds.Close (C.int (Selector.W_Sig_Socket)); -- Reset R_Sig_Socket and W_Sig_Socket to No_Socket to ensure that any -- (erroneous) subsequent attempt to use this selector properly fails. Selector.R_Sig_Socket := No_Socket; Selector.W_Sig_Socket := No_Socket; end Close_Selector; ------------------ -- Close_Socket -- ------------------ procedure Close_Socket (Socket : Socket_Type) is Res : C.int; begin Res := C_Close (C.int (Socket)); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Close_Socket; -------------------- -- Connect_Socket -- -------------------- function Connect_Socket (Socket : Socket_Type; Server : Sock_Addr_Type) return C.int is Sin : aliased Sockaddr_In; Len : constant C.int := Sin'Size / 8; begin if Server.Family = Family_Inet6 then raise Socket_Error with "IPv6 not supported"; end if; Set_Family (Sin.Sin_Family, Server.Family); Set_Address (Sin'Unchecked_Access, To_In_Addr (Server.Addr)); Set_Port (Sin'Unchecked_Access, Short_To_Network (C.unsigned_short (Server.Port))); return C_Connect (C.int (Socket), Sin'Address, Len); end Connect_Socket; procedure Connect_Socket (Socket : Socket_Type; Server : Sock_Addr_Type) is begin if Connect_Socket (Socket, Server) = Failure then Raise_Socket_Error (Socket_Errno); end if; end Connect_Socket; procedure Connect_Socket (Socket : Socket_Type; Server : Sock_Addr_Type; Timeout : Selector_Duration; Selector : access Selector_Type := null; Status : out Selector_Status) is Req : Request_Type; -- Used to set Socket to non-blocking I/O Conn_Err : aliased Integer; -- Error status of the socket after completion of select(2) Res : C.int; Conn_Err_Size : aliased C.int := Conn_Err'Size / 8; -- For getsockopt(2) call begin if Selector /= null and then not Is_Open (Selector.all) then raise Program_Error with "closed selector"; end if; -- Set the socket to non-blocking I/O Req := (Name => Non_Blocking_IO, Enabled => True); Control_Socket (Socket, Request => Req); -- Start operation (non-blocking), will return Failure with errno set -- to EINPROGRESS. Res := Connect_Socket (Socket, Server); if Res = Failure then Conn_Err := Socket_Errno; if Conn_Err /= SOSC.EINPROGRESS then Raise_Socket_Error (Conn_Err); end if; end if; -- Wait for socket to become available for writing (unless the Timeout -- is zero, in which case we consider that it has already expired, and -- we do not need to wait at all). if Timeout = 0.0 then Status := Expired; else Wait_On_Socket (Socket => Socket, For_Read => False, Timeout => Timeout, Selector => Selector, Status => Status); end if; -- Check error condition (the asynchronous connect may have terminated -- with an error, e.g. ECONNREFUSED) if select(2) completed. if Status = Completed then Res := C_Getsockopt (C.int (Socket), SOSC.SOL_SOCKET, SOSC.SO_ERROR, Conn_Err'Address, Conn_Err_Size'Access); if Res /= 0 then Conn_Err := Socket_Errno; end if; else Conn_Err := 0; end if; -- Reset the socket to blocking I/O Req := (Name => Non_Blocking_IO, Enabled => False); Control_Socket (Socket, Request => Req); -- Report error condition if any if Conn_Err /= 0 then Raise_Socket_Error (Conn_Err); end if; end Connect_Socket; -------------------- -- Control_Socket -- -------------------- procedure Control_Socket (Socket : Socket_Type; Request : in out Request_Type) is Arg : aliased C.int; Res : C.int; begin case Request.Name is when Non_Blocking_IO => Arg := C.int (Boolean'Pos (Request.Enabled)); when N_Bytes_To_Read => null; end case; Res := Socket_Ioctl (C.int (Socket), Requests (Request.Name), Arg'Unchecked_Access); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; case Request.Name is when Non_Blocking_IO => null; when N_Bytes_To_Read => Request.Size := Natural (Arg); end case; end Control_Socket; ---------- -- Copy -- ---------- procedure Copy (Source : Socket_Set_Type; Target : out Socket_Set_Type) is begin Target := Source; end Copy; --------------------- -- Create_Selector -- --------------------- procedure Create_Selector (Selector : out Selector_Type) is Two_Fds : aliased Fd_Pair; Res : C.int; begin if Is_Open (Selector) then -- Raise exception to prevent socket descriptor leak raise Program_Error with "selector already open"; end if; -- We open two signalling file descriptors. One of them is used to send -- data to the other, which is included in a C_Select socket set. The -- communication is used to force a call to C_Select to complete, and -- the waiting task to resume its execution. Res := Signalling_Fds.Create (Two_Fds'Access); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Selector.R_Sig_Socket := Socket_Type (Two_Fds (Read_End)); Selector.W_Sig_Socket := Socket_Type (Two_Fds (Write_End)); end Create_Selector; ------------------- -- Create_Socket -- ------------------- procedure Create_Socket (Socket : out Socket_Type; Family : Family_Type := Family_Inet; Mode : Mode_Type := Socket_Stream) is Res : C.int; begin Res := C_Socket (Families (Family), Modes (Mode), 0); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Socket := Socket_Type (Res); end Create_Socket; ----------- -- Empty -- ----------- procedure Empty (Item : out Socket_Set_Type) is begin Reset_Socket_Set (Item.Set'Access); Item.Last := No_Socket; end Empty; -------------------- -- Err_Code_Image -- -------------------- function Err_Code_Image (E : Integer) return String is Msg : String := E'Img & "] "; begin Msg (Msg'First) := '['; return Msg; end Err_Code_Image; -------------- -- Finalize -- -------------- procedure Finalize (X : in out Sockets_Library_Controller) is pragma Unreferenced (X); begin -- Finalization operation for the GNAT.Sockets package Thin.Finalize; end Finalize; -------------- -- Finalize -- -------------- procedure Finalize is begin -- This is a dummy placeholder for an obsolete API. -- The real finalization actions are in Initialize primitive operation -- of Sockets_Library_Controller. null; end Finalize; --------- -- Get -- --------- procedure Get (Item : in out Socket_Set_Type; Socket : out Socket_Type) is S : aliased C.int; L : aliased C.int := C.int (Item.Last); begin if Item.Last /= No_Socket then Get_Socket_From_Set (Item.Set'Access, Last => L'Access, Socket => S'Access); Item.Last := Socket_Type (L); Socket := Socket_Type (S); else Socket := No_Socket; end if; end Get; ----------------- -- Get_Address -- ----------------- function Get_Address (Stream : not null Stream_Access) return Sock_Addr_Type is begin if Stream.all in Datagram_Socket_Stream_Type then return Datagram_Socket_Stream_Type (Stream.all).From; else return Get_Peer_Name (Stream_Socket_Stream_Type (Stream.all).Socket); end if; end Get_Address; ------------------------- -- Get_Host_By_Address -- ------------------------- function Get_Host_By_Address (Address : Inet_Addr_Type; Family : Family_Type := Family_Inet) return Host_Entry_Type is pragma Unreferenced (Family); HA : aliased In_Addr := To_In_Addr (Address); Buflen : constant C.int := Netdb_Buffer_Size; Buf : aliased C.char_array (1 .. Netdb_Buffer_Size); Res : aliased Hostent; Err : aliased C.int; begin Netdb_Lock; if C_Gethostbyaddr (HA'Address, HA'Size / 8, SOSC.AF_INET, Res'Access, Buf'Address, Buflen, Err'Access) /= 0 then Netdb_Unlock; Raise_Host_Error (Integer (Err), Image (Address)); end if; begin return H : constant Host_Entry_Type := To_Host_Entry (Res'Unchecked_Access) do Netdb_Unlock; end return; exception when others => Netdb_Unlock; raise; end; end Get_Host_By_Address; ---------------------- -- Get_Host_By_Name -- ---------------------- function Get_Host_By_Name (Name : String) return Host_Entry_Type is begin -- Detect IP address name and redirect to Inet_Addr if Is_IP_Address (Name) then return Get_Host_By_Address (Inet_Addr (Name)); end if; declare HN : constant C.char_array := C.To_C (Name); Buflen : constant C.int := Netdb_Buffer_Size; Buf : aliased C.char_array (1 .. Netdb_Buffer_Size); Res : aliased Hostent; Err : aliased C.int; begin Netdb_Lock; if C_Gethostbyname (HN, Res'Access, Buf'Address, Buflen, Err'Access) /= 0 then Netdb_Unlock; Raise_Host_Error (Integer (Err), Name); end if; return H : constant Host_Entry_Type := To_Host_Entry (Res'Unchecked_Access) do Netdb_Unlock; end return; end; end Get_Host_By_Name; ------------------- -- Get_Peer_Name -- ------------------- function Get_Peer_Name (Socket : Socket_Type) return Sock_Addr_Type is Sin : aliased Sockaddr_In; Len : aliased C.int := Sin'Size / 8; Res : Sock_Addr_Type (Family_Inet); begin if C_Getpeername (C.int (Socket), Sin'Address, Len'Access) = Failure then Raise_Socket_Error (Socket_Errno); end if; To_Inet_Addr (Sin.Sin_Addr, Res.Addr); Res.Port := Port_Type (Network_To_Short (Sin.Sin_Port)); return Res; end Get_Peer_Name; ------------------------- -- Get_Service_By_Name -- ------------------------- function Get_Service_By_Name (Name : String; Protocol : String) return Service_Entry_Type is SN : constant C.char_array := C.To_C (Name); SP : constant C.char_array := C.To_C (Protocol); Buflen : constant C.int := Netdb_Buffer_Size; Buf : aliased C.char_array (1 .. Netdb_Buffer_Size); Res : aliased Servent; begin Netdb_Lock; if C_Getservbyname (SN, SP, Res'Access, Buf'Address, Buflen) /= 0 then Netdb_Unlock; raise Service_Error with "Service not found"; end if; -- Translate from the C format to the API format return S : constant Service_Entry_Type := To_Service_Entry (Res'Unchecked_Access) do Netdb_Unlock; end return; end Get_Service_By_Name; ------------------------- -- Get_Service_By_Port -- ------------------------- function Get_Service_By_Port (Port : Port_Type; Protocol : String) return Service_Entry_Type is SP : constant C.char_array := C.To_C (Protocol); Buflen : constant C.int := Netdb_Buffer_Size; Buf : aliased C.char_array (1 .. Netdb_Buffer_Size); Res : aliased Servent; begin Netdb_Lock; if C_Getservbyport (C.int (Short_To_Network (C.unsigned_short (Port))), SP, Res'Access, Buf'Address, Buflen) /= 0 then Netdb_Unlock; raise Service_Error with "Service not found"; end if; -- Translate from the C format to the API format return S : constant Service_Entry_Type := To_Service_Entry (Res'Unchecked_Access) do Netdb_Unlock; end return; end Get_Service_By_Port; --------------------- -- Get_Socket_Name -- --------------------- function Get_Socket_Name (Socket : Socket_Type) return Sock_Addr_Type is Sin : aliased Sockaddr_In; Len : aliased C.int := Sin'Size / 8; Res : C.int; Addr : Sock_Addr_Type := No_Sock_Addr; begin Res := C_Getsockname (C.int (Socket), Sin'Address, Len'Access); if Res /= Failure then To_Inet_Addr (Sin.Sin_Addr, Addr.Addr); Addr.Port := Port_Type (Network_To_Short (Sin.Sin_Port)); end if; return Addr; end Get_Socket_Name; ----------------------- -- Get_Socket_Option -- ----------------------- function Get_Socket_Option (Socket : Socket_Type; Level : Level_Type := Socket_Level; Name : Option_Name) return Option_Type is use SOSC; use type C.unsigned_char; V8 : aliased Two_Ints; V4 : aliased C.int; V1 : aliased C.unsigned_char; VT : aliased Timeval; Len : aliased C.int; Add : System.Address; Res : C.int; Opt : Option_Type (Name); begin case Name is when Multicast_Loop | Multicast_TTL | Receive_Packet_Info => Len := V1'Size / 8; Add := V1'Address; when Keep_Alive | Reuse_Address | Broadcast | No_Delay | Send_Buffer | Receive_Buffer | Multicast_If | Error => Len := V4'Size / 8; Add := V4'Address; when Send_Timeout | Receive_Timeout => -- The standard argument for SO_RCVTIMEO and SO_SNDTIMEO is a -- struct timeval, but on Windows it is a milliseconds count in -- a DWORD. if Target_OS = Windows then Len := V4'Size / 8; Add := V4'Address; else Len := VT'Size / 8; Add := VT'Address; end if; when Linger | Add_Membership | Drop_Membership => Len := V8'Size / 8; Add := V8'Address; end case; Res := C_Getsockopt (C.int (Socket), Levels (Level), Options (Name), Add, Len'Access); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; case Name is when Keep_Alive | Reuse_Address | Broadcast | No_Delay => Opt.Enabled := (V4 /= 0); when Linger => Opt.Enabled := (V8 (V8'First) /= 0); Opt.Seconds := Natural (V8 (V8'Last)); when Send_Buffer | Receive_Buffer => Opt.Size := Natural (V4); when Error => Opt.Error := Resolve_Error (Integer (V4)); when Add_Membership | Drop_Membership => To_Inet_Addr (To_In_Addr (V8 (V8'First)), Opt.Multicast_Address); To_Inet_Addr (To_In_Addr (V8 (V8'Last)), Opt.Local_Interface); when Multicast_If => To_Inet_Addr (To_In_Addr (V4), Opt.Outgoing_If); when Multicast_TTL => Opt.Time_To_Live := Integer (V1); when Multicast_Loop | Receive_Packet_Info => Opt.Enabled := (V1 /= 0); when Send_Timeout | Receive_Timeout => if Target_OS = Windows then -- Timeout is in milliseconds, actual value is 500 ms + -- returned value (unless it is 0). if V4 = 0 then Opt.Timeout := 0.0; else Opt.Timeout := Natural (V4) * 0.001 + 0.500; end if; else Opt.Timeout := To_Duration (VT); end if; end case; return Opt; end Get_Socket_Option; --------------- -- Host_Name -- --------------- function Host_Name return String is Name : aliased C.char_array (1 .. 64); Res : C.int; begin Res := C_Gethostname (Name'Address, Name'Length); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; return C.To_Ada (Name); end Host_Name; ----------- -- Image -- ----------- function Image (Val : Inet_Addr_VN_Type; Hex : Boolean := False) return String is -- The largest Inet_Addr_Comp_Type image occurs with IPv4. It -- has at most a length of 3 plus one '.' character. Buffer : String (1 .. 4 * Val'Length); Length : Natural := 1; Separator : Character; procedure Img10 (V : Inet_Addr_Comp_Type); -- Append to Buffer image of V in decimal format procedure Img16 (V : Inet_Addr_Comp_Type); -- Append to Buffer image of V in hexadecimal format ----------- -- Img10 -- ----------- procedure Img10 (V : Inet_Addr_Comp_Type) is Img : constant String := V'Img; Len : constant Natural := Img'Length - 1; begin Buffer (Length .. Length + Len - 1) := Img (2 .. Img'Last); Length := Length + Len; end Img10; ----------- -- Img16 -- ----------- procedure Img16 (V : Inet_Addr_Comp_Type) is begin Buffer (Length) := Hex_To_Char (Natural (V / 16) + 1); Buffer (Length + 1) := Hex_To_Char (Natural (V mod 16) + 1); Length := Length + 2; end Img16; -- Start of processing for Image begin Separator := (if Hex then ':' else '.'); for J in Val'Range loop if Hex then Img16 (Val (J)); else Img10 (Val (J)); end if; if J /= Val'Last then Buffer (Length) := Separator; Length := Length + 1; end if; end loop; return Buffer (1 .. Length - 1); end Image; ----------- -- Image -- ----------- function Image (Value : Inet_Addr_Type) return String is begin if Value.Family = Family_Inet then return Image (Inet_Addr_VN_Type (Value.Sin_V4), Hex => False); else return Image (Inet_Addr_VN_Type (Value.Sin_V6), Hex => True); end if; end Image; ----------- -- Image -- ----------- function Image (Value : Sock_Addr_Type) return String is Port : constant String := Value.Port'Img; begin return Image (Value.Addr) & ':' & Port (2 .. Port'Last); end Image; ----------- -- Image -- ----------- function Image (Socket : Socket_Type) return String is begin return Socket'Img; end Image; ----------- -- Image -- ----------- function Image (Item : Socket_Set_Type) return String is Socket_Set : Socket_Set_Type := Item; begin declare Last_Img : constant String := Socket_Set.Last'Img; Buffer : String (1 .. (Integer (Socket_Set.Last) + 1) * Last_Img'Length); Index : Positive := 1; Socket : Socket_Type; begin while not Is_Empty (Socket_Set) loop Get (Socket_Set, Socket); declare Socket_Img : constant String := Socket'Img; begin Buffer (Index .. Index + Socket_Img'Length - 1) := Socket_Img; Index := Index + Socket_Img'Length; end; end loop; return "[" & Last_Img & "]" & Buffer (1 .. Index - 1); end; end Image; --------------- -- Inet_Addr -- --------------- function Inet_Addr (Image : String) return Inet_Addr_Type is use Interfaces.C; Img : aliased char_array := To_C (Image); Addr : aliased C.int; Res : C.int; Result : Inet_Addr_Type; begin -- Special case for an empty Image as on some platforms (e.g. Windows) -- calling Inet_Addr("") will not return an error. if Image = "" then Raise_Socket_Error (SOSC.EINVAL); end if; Res := Inet_Pton (SOSC.AF_INET, Img'Address, Addr'Address); if Res < 0 then Raise_Socket_Error (Socket_Errno); elsif Res = 0 then Raise_Socket_Error (SOSC.EINVAL); end if; To_Inet_Addr (To_In_Addr (Addr), Result); return Result; end Inet_Addr; ---------------- -- Initialize -- ---------------- procedure Initialize (X : in out Sockets_Library_Controller) is pragma Unreferenced (X); begin Thin.Initialize; end Initialize; ---------------- -- Initialize -- ---------------- procedure Initialize (Process_Blocking_IO : Boolean) is Expected : constant Boolean := not SOSC.Thread_Blocking_IO; begin if Process_Blocking_IO /= Expected then raise Socket_Error with "incorrect Process_Blocking_IO setting, expected " & Expected'Img; end if; -- This is a dummy placeholder for an obsolete API -- Real initialization actions are in Initialize primitive operation -- of Sockets_Library_Controller. null; end Initialize; ---------------- -- Initialize -- ---------------- procedure Initialize is begin -- This is a dummy placeholder for an obsolete API -- Real initialization actions are in Initialize primitive operation -- of Sockets_Library_Controller. null; end Initialize; -------------- -- Is_Empty -- -------------- function Is_Empty (Item : Socket_Set_Type) return Boolean is begin return Item.Last = No_Socket; end Is_Empty; ------------------- -- Is_IP_Address -- ------------------- function Is_IP_Address (Name : String) return Boolean is begin for J in Name'Range loop if Name (J) /= '.' and then Name (J) not in '0' .. '9' then return False; end if; end loop; return True; end Is_IP_Address; ------------- -- Is_Open -- ------------- function Is_Open (S : Selector_Type) return Boolean is begin if S.Is_Null then return True; else -- Either both controlling socket descriptors are valid (case of an -- open selector) or neither (case of a closed selector). pragma Assert ((S.R_Sig_Socket /= No_Socket) = (S.W_Sig_Socket /= No_Socket)); return S.R_Sig_Socket /= No_Socket; end if; end Is_Open; ------------ -- Is_Set -- ------------ function Is_Set (Item : Socket_Set_Type; Socket : Socket_Type) return Boolean is begin Check_For_Fd_Set (Socket); return Item.Last /= No_Socket and then Socket <= Item.Last and then Is_Socket_In_Set (Item.Set'Access, C.int (Socket)) /= 0; end Is_Set; ------------------- -- Listen_Socket -- ------------------- procedure Listen_Socket (Socket : Socket_Type; Length : Natural := 15) is Res : constant C.int := C_Listen (C.int (Socket), C.int (Length)); begin if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Listen_Socket; ------------ -- Narrow -- ------------ procedure Narrow (Item : in out Socket_Set_Type) is Last : aliased C.int := C.int (Item.Last); begin if Item.Last /= No_Socket then Last_Socket_In_Set (Item.Set'Access, Last'Unchecked_Access); Item.Last := Socket_Type (Last); end if; end Narrow; ---------------- -- Netdb_Lock -- ---------------- procedure Netdb_Lock is begin if Need_Netdb_Lock then System.Task_Lock.Lock; end if; end Netdb_Lock; ------------------ -- Netdb_Unlock -- ------------------ procedure Netdb_Unlock is begin if Need_Netdb_Lock then System.Task_Lock.Unlock; end if; end Netdb_Unlock; -------------------------------- -- Normalize_Empty_Socket_Set -- -------------------------------- procedure Normalize_Empty_Socket_Set (S : in out Socket_Set_Type) is begin if S.Last = No_Socket then Reset_Socket_Set (S.Set'Access); end if; end Normalize_Empty_Socket_Set; ------------------- -- Official_Name -- ------------------- function Official_Name (E : Host_Entry_Type) return String is begin return To_String (E.Official); end Official_Name; ------------------- -- Official_Name -- ------------------- function Official_Name (S : Service_Entry_Type) return String is begin return To_String (S.Official); end Official_Name; -------------------- -- Wait_On_Socket -- -------------------- procedure Wait_On_Socket (Socket : Socket_Type; For_Read : Boolean; Timeout : Selector_Duration; Selector : access Selector_Type := null; Status : out Selector_Status) is type Local_Selector_Access is access Selector_Type; for Local_Selector_Access'Storage_Size use Selector_Type'Size; S : Selector_Access; -- Selector to use for waiting R_Fd_Set : Socket_Set_Type; W_Fd_Set : Socket_Set_Type; begin -- Create selector if not provided by the user if Selector = null then declare Local_S : constant Local_Selector_Access := new Selector_Type; begin S := Local_S.all'Unchecked_Access; Create_Selector (S.all); end; else S := Selector.all'Access; end if; if For_Read then Set (R_Fd_Set, Socket); else Set (W_Fd_Set, Socket); end if; Check_Selector (S.all, R_Fd_Set, W_Fd_Set, Status, Timeout); if Selector = null then Close_Selector (S.all); end if; end Wait_On_Socket; ----------------- -- Port_Number -- ----------------- function Port_Number (S : Service_Entry_Type) return Port_Type is begin return S.Port; end Port_Number; ------------------- -- Protocol_Name -- ------------------- function Protocol_Name (S : Service_Entry_Type) return String is begin return To_String (S.Protocol); end Protocol_Name; ---------------------- -- Raise_Host_Error -- ---------------------- procedure Raise_Host_Error (H_Error : Integer; Name : String) is function Dedot (Value : String) return String is (if Value /= "" and then Value (Value'Last) = '.' then Value (Value'First .. Value'Last - 1) else Value); -- Removes dot at the end of error message begin raise Host_Error with Err_Code_Image (H_Error) & Dedot (Host_Error_Messages.Host_Error_Message (H_Error)) & ": " & Name; end Raise_Host_Error; ------------------------ -- Raise_Socket_Error -- ------------------------ procedure Raise_Socket_Error (Error : Integer) is begin raise Socket_Error with Err_Code_Image (Error) & Socket_Error_Message (Error); end Raise_Socket_Error; ---------- -- Read -- ---------- procedure Read (Stream : in out Datagram_Socket_Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset) is begin Receive_Socket (Stream.Socket, Item, Last, Stream.From); end Read; ---------- -- Read -- ---------- procedure Read (Stream : in out Stream_Socket_Stream_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset) is First : Ada.Streams.Stream_Element_Offset := Item'First; Index : Ada.Streams.Stream_Element_Offset := First - 1; Max : constant Ada.Streams.Stream_Element_Offset := Item'Last; begin loop Receive_Socket (Stream.Socket, Item (First .. Max), Index); Last := Index; -- Exit when all or zero data received. Zero means that the socket -- peer is closed. exit when Index < First or else Index = Max; First := Index + 1; end loop; end Read; -------------------- -- Receive_Socket -- -------------------- procedure Receive_Socket (Socket : Socket_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset; Flags : Request_Flag_Type := No_Request_Flag) is Res : C.int; begin Res := C_Recv (C.int (Socket), Item'Address, Item'Length, To_Int (Flags)); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Last := Last_Index (First => Item'First, Count => size_t (Res)); end Receive_Socket; -------------------- -- Receive_Socket -- -------------------- procedure Receive_Socket (Socket : Socket_Type; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset; From : out Sock_Addr_Type; Flags : Request_Flag_Type := No_Request_Flag) is Res : C.int; Sin : aliased Sockaddr_In; Len : aliased C.int := Sin'Size / 8; begin Res := C_Recvfrom (C.int (Socket), Item'Address, Item'Length, To_Int (Flags), Sin'Address, Len'Access); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Last := Last_Index (First => Item'First, Count => size_t (Res)); To_Inet_Addr (Sin.Sin_Addr, From.Addr); From.Port := Port_Type (Network_To_Short (Sin.Sin_Port)); end Receive_Socket; -------------------- -- Receive_Vector -- -------------------- procedure Receive_Vector (Socket : Socket_Type; Vector : Vector_Type; Count : out Ada.Streams.Stream_Element_Count; Flags : Request_Flag_Type := No_Request_Flag) is Res : ssize_t; Msg : Msghdr := (Msg_Name => System.Null_Address, Msg_Namelen => 0, Msg_Iov => Vector'Address, -- recvmsg(2) returns EMSGSIZE on Linux (and probably on other -- platforms) when the supplied vector is longer than IOV_MAX, -- so use minimum of the two lengths. Msg_Iovlen => SOSC.Msg_Iovlen_T'Min (Vector'Length, SOSC.IOV_MAX), Msg_Control => System.Null_Address, Msg_Controllen => 0, Msg_Flags => 0); begin Res := C_Recvmsg (C.int (Socket), Msg'Address, To_Int (Flags)); if Res = ssize_t (Failure) then Raise_Socket_Error (Socket_Errno); end if; Count := Ada.Streams.Stream_Element_Count (Res); end Receive_Vector; ------------------- -- Resolve_Error -- ------------------- function Resolve_Error (Error_Value : Integer; From_Errno : Boolean := True) return Error_Type is use GNAT.Sockets.SOSC; begin if not From_Errno then case Error_Value is when SOSC.HOST_NOT_FOUND => return Unknown_Host; when SOSC.TRY_AGAIN => return Host_Name_Lookup_Failure; when SOSC.NO_RECOVERY => return Non_Recoverable_Error; when SOSC.NO_DATA => return Unknown_Server_Error; when others => return Cannot_Resolve_Error; end case; end if; -- Special case: EAGAIN may be the same value as EWOULDBLOCK, so we -- can't include it in the case statement below. pragma Warnings (Off); -- Condition "EAGAIN /= EWOULDBLOCK" is known at compile time if EAGAIN /= EWOULDBLOCK and then Error_Value = EAGAIN then return Resource_Temporarily_Unavailable; end if; -- This is not a case statement because if a particular error -- number constant is not defined, s-oscons-tmplt.c defines -- it to -1. If multiple constants are not defined, they -- would each be -1 and result in a "duplicate value in case" error. -- -- But we have to leave warnings off because the compiler is also -- smart enough to note that when two errnos have the same value, -- the second if condition is useless. if Error_Value = ENOERROR then return Success; elsif Error_Value = EACCES then return Permission_Denied; elsif Error_Value = EADDRINUSE then return Address_Already_In_Use; elsif Error_Value = EADDRNOTAVAIL then return Cannot_Assign_Requested_Address; elsif Error_Value = EAFNOSUPPORT then return Address_Family_Not_Supported_By_Protocol; elsif Error_Value = EALREADY then return Operation_Already_In_Progress; elsif Error_Value = EBADF then return Bad_File_Descriptor; elsif Error_Value = ECONNABORTED then return Software_Caused_Connection_Abort; elsif Error_Value = ECONNREFUSED then return Connection_Refused; elsif Error_Value = ECONNRESET then return Connection_Reset_By_Peer; elsif Error_Value = EDESTADDRREQ then return Destination_Address_Required; elsif Error_Value = EFAULT then return Bad_Address; elsif Error_Value = EHOSTDOWN then return Host_Is_Down; elsif Error_Value = EHOSTUNREACH then return No_Route_To_Host; elsif Error_Value = EINPROGRESS then return Operation_Now_In_Progress; elsif Error_Value = EINTR then return Interrupted_System_Call; elsif Error_Value = EINVAL then return Invalid_Argument; elsif Error_Value = EIO then return Input_Output_Error; elsif Error_Value = EISCONN then return Transport_Endpoint_Already_Connected; elsif Error_Value = ELOOP then return Too_Many_Symbolic_Links; elsif Error_Value = EMFILE then return Too_Many_Open_Files; elsif Error_Value = EMSGSIZE then return Message_Too_Long; elsif Error_Value = ENAMETOOLONG then return File_Name_Too_Long; elsif Error_Value = ENETDOWN then return Network_Is_Down; elsif Error_Value = ENETRESET then return Network_Dropped_Connection_Because_Of_Reset; elsif Error_Value = ENETUNREACH then return Network_Is_Unreachable; elsif Error_Value = ENOBUFS then return No_Buffer_Space_Available; elsif Error_Value = ENOPROTOOPT then return Protocol_Not_Available; elsif Error_Value = ENOTCONN then return Transport_Endpoint_Not_Connected; elsif Error_Value = ENOTSOCK then return Socket_Operation_On_Non_Socket; elsif Error_Value = EOPNOTSUPP then return Operation_Not_Supported; elsif Error_Value = EPFNOSUPPORT then return Protocol_Family_Not_Supported; elsif Error_Value = EPIPE then return Broken_Pipe; elsif Error_Value = EPROTONOSUPPORT then return Protocol_Not_Supported; elsif Error_Value = EPROTOTYPE then return Protocol_Wrong_Type_For_Socket; elsif Error_Value = ESHUTDOWN then return Cannot_Send_After_Transport_Endpoint_Shutdown; elsif Error_Value = ESOCKTNOSUPPORT then return Socket_Type_Not_Supported; elsif Error_Value = ETIMEDOUT then return Connection_Timed_Out; elsif Error_Value = ETOOMANYREFS then return Too_Many_References; elsif Error_Value = EWOULDBLOCK then return Resource_Temporarily_Unavailable; else return Cannot_Resolve_Error; end if; pragma Warnings (On); end Resolve_Error; ----------------------- -- Resolve_Exception -- ----------------------- function Resolve_Exception (Occurrence : Exception_Occurrence) return Error_Type is Id : constant Exception_Id := Exception_Identity (Occurrence); Msg : constant String := Exception_Message (Occurrence); First : Natural; Last : Natural; Val : Integer; begin First := Msg'First; while First <= Msg'Last and then Msg (First) not in '0' .. '9' loop First := First + 1; end loop; if First > Msg'Last then return Cannot_Resolve_Error; end if; Last := First; while Last < Msg'Last and then Msg (Last + 1) in '0' .. '9' loop Last := Last + 1; end loop; Val := Integer'Value (Msg (First .. Last)); if Id = Socket_Error_Id then return Resolve_Error (Val); elsif Id = Host_Error_Id then return Resolve_Error (Val, False); else return Cannot_Resolve_Error; end if; end Resolve_Exception; ----------------- -- Send_Socket -- ----------------- procedure Send_Socket (Socket : Socket_Type; Item : Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset; Flags : Request_Flag_Type := No_Request_Flag) is begin Send_Socket (Socket, Item, Last, To => null, Flags => Flags); end Send_Socket; ----------------- -- Send_Socket -- ----------------- procedure Send_Socket (Socket : Socket_Type; Item : Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset; To : Sock_Addr_Type; Flags : Request_Flag_Type := No_Request_Flag) is begin Send_Socket (Socket, Item, Last, To => To'Unrestricted_Access, Flags => Flags); end Send_Socket; ----------------- -- Send_Socket -- ----------------- procedure Send_Socket (Socket : Socket_Type; Item : Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset; To : access Sock_Addr_Type; Flags : Request_Flag_Type := No_Request_Flag) is Res : C.int; Sin : aliased Sockaddr_In; C_To : System.Address; Len : C.int; begin if To /= null then Set_Family (Sin.Sin_Family, To.Family); Set_Address (Sin'Unchecked_Access, To_In_Addr (To.Addr)); Set_Port (Sin'Unchecked_Access, Short_To_Network (C.unsigned_short (To.Port))); C_To := Sin'Address; Len := Sin'Size / 8; else C_To := System.Null_Address; Len := 0; end if; Res := C_Sendto (C.int (Socket), Item'Address, Item'Length, Set_Forced_Flags (To_Int (Flags)), C_To, Len); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; Last := Last_Index (First => Item'First, Count => size_t (Res)); end Send_Socket; ----------------- -- Send_Vector -- ----------------- procedure Send_Vector (Socket : Socket_Type; Vector : Vector_Type; Count : out Ada.Streams.Stream_Element_Count; Flags : Request_Flag_Type := No_Request_Flag) is use SOSC; use Interfaces.C; Res : ssize_t; Iov_Count : SOSC.Msg_Iovlen_T; This_Iov_Count : SOSC.Msg_Iovlen_T; Msg : Msghdr; begin Count := 0; Iov_Count := 0; while Iov_Count < Vector'Length loop pragma Warnings (Off); -- Following test may be compile time known on some targets This_Iov_Count := (if Vector'Length - Iov_Count > SOSC.IOV_MAX then SOSC.IOV_MAX else Vector'Length - Iov_Count); pragma Warnings (On); Msg := (Msg_Name => System.Null_Address, Msg_Namelen => 0, Msg_Iov => Vector (Vector'First + Integer (Iov_Count))'Address, Msg_Iovlen => This_Iov_Count, Msg_Control => System.Null_Address, Msg_Controllen => 0, Msg_Flags => 0); Res := C_Sendmsg (C.int (Socket), Msg'Address, Set_Forced_Flags (To_Int (Flags))); if Res = ssize_t (Failure) then Raise_Socket_Error (Socket_Errno); end if; Count := Count + Ada.Streams.Stream_Element_Count (Res); Iov_Count := Iov_Count + This_Iov_Count; end loop; end Send_Vector; --------- -- Set -- --------- procedure Set (Item : in out Socket_Set_Type; Socket : Socket_Type) is begin Check_For_Fd_Set (Socket); if Item.Last = No_Socket then -- Uninitialized socket set, make sure it is properly zeroed out Reset_Socket_Set (Item.Set'Access); Item.Last := Socket; elsif Item.Last < Socket then Item.Last := Socket; end if; Insert_Socket_In_Set (Item.Set'Access, C.int (Socket)); end Set; ----------------------- -- Set_Close_On_Exec -- ----------------------- procedure Set_Close_On_Exec (Socket : Socket_Type; Close_On_Exec : Boolean; Status : out Boolean) is function C_Set_Close_On_Exec (Socket : Socket_Type; Close_On_Exec : C.int) return C.int; pragma Import (C, C_Set_Close_On_Exec, "__gnat_set_close_on_exec"); begin Status := C_Set_Close_On_Exec (Socket, Boolean'Pos (Close_On_Exec)) = 0; end Set_Close_On_Exec; ---------------------- -- Set_Forced_Flags -- ---------------------- function Set_Forced_Flags (F : C.int) return C.int is use type C.unsigned; function To_unsigned is new Ada.Unchecked_Conversion (C.int, C.unsigned); function To_int is new Ada.Unchecked_Conversion (C.unsigned, C.int); begin return To_int (To_unsigned (F) or SOSC.MSG_Forced_Flags); end Set_Forced_Flags; ----------------------- -- Set_Socket_Option -- ----------------------- procedure Set_Socket_Option (Socket : Socket_Type; Level : Level_Type := Socket_Level; Option : Option_Type) is use SOSC; V8 : aliased Two_Ints; V4 : aliased C.int; V1 : aliased C.unsigned_char; VT : aliased Timeval; Len : C.int; Add : System.Address := Null_Address; Res : C.int; begin case Option.Name is when Keep_Alive | Reuse_Address | Broadcast | No_Delay => V4 := C.int (Boolean'Pos (Option.Enabled)); Len := V4'Size / 8; Add := V4'Address; when Linger => V8 (V8'First) := C.int (Boolean'Pos (Option.Enabled)); V8 (V8'Last) := C.int (Option.Seconds); Len := V8'Size / 8; Add := V8'Address; when Send_Buffer | Receive_Buffer => V4 := C.int (Option.Size); Len := V4'Size / 8; Add := V4'Address; when Error => V4 := C.int (Boolean'Pos (True)); Len := V4'Size / 8; Add := V4'Address; when Add_Membership | Drop_Membership => V8 (V8'First) := To_Int (To_In_Addr (Option.Multicast_Address)); V8 (V8'Last) := To_Int (To_In_Addr (Option.Local_Interface)); Len := V8'Size / 8; Add := V8'Address; when Multicast_If => V4 := To_Int (To_In_Addr (Option.Outgoing_If)); Len := V4'Size / 8; Add := V4'Address; when Multicast_TTL => V1 := C.unsigned_char (Option.Time_To_Live); Len := V1'Size / 8; Add := V1'Address; when Multicast_Loop | Receive_Packet_Info => V1 := C.unsigned_char (Boolean'Pos (Option.Enabled)); Len := V1'Size / 8; Add := V1'Address; when Send_Timeout | Receive_Timeout => if Target_OS = Windows then -- On Windows, the timeout is a DWORD in milliseconds, and -- the actual timeout is 500 ms + the given value (unless it -- is 0). V4 := C.int (Option.Timeout / 0.001); if V4 > 500 then V4 := V4 - 500; elsif V4 > 0 then V4 := 1; end if; Len := V4'Size / 8; Add := V4'Address; else VT := To_Timeval (Option.Timeout); Len := VT'Size / 8; Add := VT'Address; end if; end case; Res := C_Setsockopt (C.int (Socket), Levels (Level), Options (Option.Name), Add, Len); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Set_Socket_Option; ---------------------- -- Short_To_Network -- ---------------------- function Short_To_Network (S : C.unsigned_short) return C.unsigned_short is use type C.unsigned_short; begin -- Big-endian case. No conversion needed. On these platforms, htons() -- defaults to a null procedure. if Default_Bit_Order = High_Order_First then return S; -- Little-endian case. We must swap the high and low bytes of this -- short to make the port number network compliant. else return (S / 256) + (S mod 256) * 256; end if; end Short_To_Network; --------------------- -- Shutdown_Socket -- --------------------- procedure Shutdown_Socket (Socket : Socket_Type; How : Shutmode_Type := Shut_Read_Write) is Res : C.int; begin Res := C_Shutdown (C.int (Socket), Shutmodes (How)); if Res = Failure then Raise_Socket_Error (Socket_Errno); end if; end Shutdown_Socket; ------------ -- Stream -- ------------ function Stream (Socket : Socket_Type; Send_To : Sock_Addr_Type) return Stream_Access is S : Datagram_Socket_Stream_Access; begin S := new Datagram_Socket_Stream_Type; S.Socket := Socket; S.To := Send_To; S.From := Get_Socket_Name (Socket); return Stream_Access (S); end Stream; ------------ -- Stream -- ------------ function Stream (Socket : Socket_Type) return Stream_Access is S : Stream_Socket_Stream_Access; begin S := new Stream_Socket_Stream_Type; S.Socket := Socket; return Stream_Access (S); end Stream; ---------- -- To_C -- ---------- function To_C (Socket : Socket_Type) return Integer is begin return Integer (Socket); end To_C; ----------------- -- To_Duration -- ----------------- function To_Duration (Val : Timeval) return Timeval_Duration is begin return Natural (Val.Tv_Sec) * 1.0 + Natural (Val.Tv_Usec) * 1.0E-6; end To_Duration; ------------------- -- To_Host_Entry -- ------------------- function To_Host_Entry (E : Hostent_Access) return Host_Entry_Type is use type C.size_t; Aliases_Count, Addresses_Count : Natural; -- H_Length is not used because it is currently only ever set to 4, as -- we only handle the case of H_Addrtype being AF_INET. begin if Hostent_H_Addrtype (E) /= SOSC.AF_INET then Raise_Socket_Error (SOSC.EPFNOSUPPORT); end if; Aliases_Count := 0; while Hostent_H_Alias (E, C.int (Aliases_Count)) /= Null_Address loop Aliases_Count := Aliases_Count + 1; end loop; Addresses_Count := 0; while Hostent_H_Addr (E, C.int (Addresses_Count)) /= Null_Address loop Addresses_Count := Addresses_Count + 1; end loop; return Result : Host_Entry_Type (Aliases_Length => Aliases_Count, Addresses_Length => Addresses_Count) do Result.Official := To_Name (Value (Hostent_H_Name (E))); for J in Result.Aliases'Range loop Result.Aliases (J) := To_Name (Value (Hostent_H_Alias (E, C.int (J - Result.Aliases'First)))); end loop; for J in Result.Addresses'Range loop declare Addr : In_Addr; -- Hostent_H_Addr (E, ) may return an address that is -- not correctly aligned for In_Addr, so we need to use -- an intermediate copy operation on a type with an alignemnt -- of 1 to recover the value. subtype Addr_Buf_T is C.char_array (1 .. Addr'Size / 8); Unaligned_Addr : Addr_Buf_T; for Unaligned_Addr'Address use Hostent_H_Addr (E, C.int (J - Result.Addresses'First)); pragma Import (Ada, Unaligned_Addr); Aligned_Addr : Addr_Buf_T; for Aligned_Addr'Address use Addr'Address; pragma Import (Ada, Aligned_Addr); begin Aligned_Addr := Unaligned_Addr; To_Inet_Addr (Addr, Result.Addresses (J)); end; end loop; end return; end To_Host_Entry; ---------------- -- To_In_Addr -- ---------------- function To_In_Addr (Addr : Inet_Addr_Type) return In_Addr is begin if Addr.Family = Family_Inet then return (S_B1 => C.unsigned_char (Addr.Sin_V4 (1)), S_B2 => C.unsigned_char (Addr.Sin_V4 (2)), S_B3 => C.unsigned_char (Addr.Sin_V4 (3)), S_B4 => C.unsigned_char (Addr.Sin_V4 (4))); end if; raise Socket_Error with "IPv6 not supported"; end To_In_Addr; ------------------ -- To_Inet_Addr -- ------------------ procedure To_Inet_Addr (Addr : In_Addr; Result : out Inet_Addr_Type) is begin Result.Sin_V4 (1) := Inet_Addr_Comp_Type (Addr.S_B1); Result.Sin_V4 (2) := Inet_Addr_Comp_Type (Addr.S_B2); Result.Sin_V4 (3) := Inet_Addr_Comp_Type (Addr.S_B3); Result.Sin_V4 (4) := Inet_Addr_Comp_Type (Addr.S_B4); end To_Inet_Addr; ------------ -- To_Int -- ------------ function To_Int (F : Request_Flag_Type) return C.int is Current : Request_Flag_Type := F; Result : C.int := 0; begin for J in Flags'Range loop exit when Current = 0; if Current mod 2 /= 0 then if Flags (J) = -1 then Raise_Socket_Error (SOSC.EOPNOTSUPP); end if; Result := Result + Flags (J); end if; Current := Current / 2; end loop; return Result; end To_Int; ------------- -- To_Name -- ------------- function To_Name (N : String) return Name_Type is begin return Name_Type'(N'Length, N); end To_Name; ---------------------- -- To_Service_Entry -- ---------------------- function To_Service_Entry (E : Servent_Access) return Service_Entry_Type is use type C.size_t; Aliases_Count : Natural; begin Aliases_Count := 0; while Servent_S_Alias (E, C.int (Aliases_Count)) /= Null_Address loop Aliases_Count := Aliases_Count + 1; end loop; return Result : Service_Entry_Type (Aliases_Length => Aliases_Count) do Result.Official := To_Name (Value (Servent_S_Name (E))); for J in Result.Aliases'Range loop Result.Aliases (J) := To_Name (Value (Servent_S_Alias (E, C.int (J - Result.Aliases'First)))); end loop; Result.Protocol := To_Name (Value (Servent_S_Proto (E))); Result.Port := Port_Type (Network_To_Short (Servent_S_Port (E))); end return; end To_Service_Entry; --------------- -- To_String -- --------------- function To_String (HN : Name_Type) return String is begin return HN.Name (1 .. HN.Length); end To_String; ---------------- -- To_Timeval -- ---------------- function To_Timeval (Val : Timeval_Duration) return Timeval is S : time_t; uS : suseconds_t; begin -- If zero, set result as zero (otherwise it gets rounded down to -1) if Val = 0.0 then S := 0; uS := 0; -- Normal case where we do round down else S := time_t (Val - 0.5); uS := suseconds_t (1_000_000 * (Val - Selector_Duration (S))); end if; return (S, uS); end To_Timeval; ----------- -- Value -- ----------- function Value (S : System.Address) return String is Str : String (1 .. Positive'Last); for Str'Address use S; pragma Import (Ada, Str); Terminator : Positive := Str'First; begin while Str (Terminator) /= ASCII.NUL loop Terminator := Terminator + 1; end loop; return Str (1 .. Terminator - 1); end Value; ----------- -- Write -- ----------- procedure Write (Stream : in out Datagram_Socket_Stream_Type; Item : Ada.Streams.Stream_Element_Array) is Last : Stream_Element_Offset; begin Send_Socket (Stream.Socket, Item, Last, Stream.To); -- It is an error if not all of the data has been sent if Last /= Item'Last then Raise_Socket_Error (Socket_Errno); end if; end Write; ----------- -- Write -- ----------- procedure Write (Stream : in out Stream_Socket_Stream_Type; Item : Ada.Streams.Stream_Element_Array) is First : Ada.Streams.Stream_Element_Offset; Index : Ada.Streams.Stream_Element_Offset; Max : constant Ada.Streams.Stream_Element_Offset := Item'Last; begin First := Item'First; Index := First - 1; while First <= Max loop Send_Socket (Stream.Socket, Item (First .. Max), Index, null); -- Exit when all or zero data sent. Zero means that the socket has -- been closed by peer. exit when Index < First or else Index = Max; First := Index + 1; end loop; -- For an empty array, we have First > Max, and hence Index >= Max (no -- error, the loop above is never executed). After a successful send, -- Index = Max. The only remaining case, Index < Max, is therefore -- always an actual send failure. if Index < Max then Raise_Socket_Error (Socket_Errno); end if; end Write; Sockets_Library_Controller_Object : Sockets_Library_Controller; pragma Unreferenced (Sockets_Library_Controller_Object); -- The elaboration and finalization of this object perform the required -- initialization and cleanup actions for the sockets library. end GNAT.Sockets;