Cygwin: fhandler_socket_unix: implement socket, bind, and close
...plus lots of helper functions. Add comment to explain how everything works. This comment will be improved while implementing the yet missing parts. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
parent
7d260cfac4
commit
97b7aaaeb7
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@ -847,6 +847,24 @@ class sun_name_t
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class fhandler_socket_unix : public fhandler_socket
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{
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protected:
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HANDLE file; /* Either NT symlink or reparse point */
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HANDLE create_abstract_link (const sun_name_t *sun,
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PUNICODE_STRING pipe_name);
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HANDLE create_reparse_point (const sun_name_t *sun,
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PUNICODE_STRING pipe_name);
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HANDLE create_file (const sun_name_t *sun);
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int open_abstract_link (sun_name_t *sun, PUNICODE_STRING pipe_name);
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int open_reparse_point (sun_name_t *sun, PUNICODE_STRING pipe_name);
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int open_file (sun_name_t *sun, int &type, PUNICODE_STRING pipe_name);
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HANDLE autobind (sun_name_t *sun);
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wchar_t get_type_char ();
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void gen_pipe_name ();
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void set_wait_state (DWORD wait_state);
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HANDLE create_pipe ();
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HANDLE create_pipe_instance ();
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protected:
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sun_name_t *sun_path;
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sun_name_t *peer_sun_path;
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@ -21,19 +21,47 @@
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "hires.h"
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#include "shared_info.h"
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#include "ntdll.h"
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#include "miscfuncs.h"
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#include "tls_pbuf.h"
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/*
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Abstract socket:
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An abstract socket is represented by a symlink in the native
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NT namespace, within the Cygin subdir in BasedNamedObjects.
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So it's globally available but only exists as long as at least on
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descriptor on the socket is open, as desired.
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The name of the symlink is: "af-unix-<sun_path>"
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<sun_path> is the transposed sun_path string, including the leading
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NUL. The transposition is simplified in that it uses every byte
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in the valid sun_path name as is, no extra multibyte conversion.
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The content of the symlink is the name of the underlying pipe.
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Named socket:
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A named socket is represented by a reparse point with a Cygwin-specific
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tag and GUID. The GenericReparseBuffer content is the name of the
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underlying pipe.
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Pipe:
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The pipe is named \\.\pipe\cygwin-<installation_key>-unix-[sd]-<uniq_id>
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- <installation_key> is the 8 byte hex Cygwin installation key
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- [sd] is s for SOCK_STREAM, d for SOCK_DGRAM
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- <uniq_id> is an 8 byte hex unique number
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Note: We use MAX_PATH here for convenience where sufficient. It's
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big enough to hold sun_path's as well as pipe names so we don't have
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to use tmp_pathbuf as often.
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*/
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/* cygwin internal: map sockaddr into internet domain address */
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static int __unused
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get_inet_addr_unix (const struct sockaddr *in, int inlen,
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struct sockaddr_storage *out, int *outlen,
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int *type = NULL)
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GUID __cygwin_socket_guid = {
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.Data1 = 0xefc1714d,
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.Data2 = 0x7b19,
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@ -42,17 +70,215 @@ GUID __cygwin_socket_guid = {
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};
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HANDLE
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fhandler_socket_unix::create_abstract_link (const sun_name_t *sun,
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PUNICODE_STRING pipe_name)
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{
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/* Check for abstract socket. */
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if (inlen >= (int) sizeof (in->sa_family) + 7
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&& in->sa_data[0] == '\0' && in->sa_data[1] == 'd'
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&& in->sa_data[6] == '\0')
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WCHAR name[MAX_PATH];
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OBJECT_ATTRIBUTES attr;
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NTSTATUS status;
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UNICODE_STRING uname;
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HANDLE fh = NULL;
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PWCHAR p = wcpcpy (name, L"af-unix-");
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/* NUL bytes have no special meaning in an abstract socket name, so
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we assume iso-8859-1 for simplicity and transpose the string.
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transform_chars_af_unix is doing just that. */
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transform_chars_af_unix (p, sun->un.sun_path, sun->un_len);
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RtlInitUnicodeString (&uname, name);
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InitializeObjectAttributes (&attr, &uname, OBJ_CASE_INSENSITIVE,
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get_shared_parent_dir (), NULL);
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/* Fill symlink with name of pipe */
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status = NtCreateSymbolicLinkObject (&fh, SYMBOLIC_LINK_ALL_ACCESS,
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&attr, pipe_name);
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if (!NT_SUCCESS (status))
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{
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/* TODO */
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return 0;
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if (status == STATUS_OBJECT_NAME_EXISTS
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|| status == STATUS_OBJECT_NAME_COLLISION)
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set_errno (EADDRINUSE);
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else
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__seterrno_from_nt_status (status);
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}
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return fh;
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}
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struct rep_pipe_name_t
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{
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USHORT Length;
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WCHAR PipeName[1];
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};
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HANDLE
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fhandler_socket_unix::create_reparse_point (const sun_name_t *sun,
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PUNICODE_STRING pipe_name)
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{
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ULONG access;
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HANDLE old_trans = NULL, trans = NULL;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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NTSTATUS status;
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HANDLE fh = NULL;
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PREPARSE_GUID_DATA_BUFFER rp;
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rep_pipe_name_t *rep_pipe_name;
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const DWORD data_len = sizeof (*rep_pipe_name) + pipe_name->Length;
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path_conv pc (sun->un.sun_path, PC_SYM_FOLLOW);
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if (pc.error)
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{
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set_errno (pc.error);
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return NULL;
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}
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if (pc.exists ())
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{
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set_errno (EADDRINUSE);
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return NULL;
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}
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/* We will overwrite the DACL after the call to NtCreateFile. This
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requires READ_CONTROL and WRITE_DAC access, otherwise get_file_sd
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and set_file_sd both have to open the file again.
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FIXME: On remote NTFS shares open sometimes fails because even the
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creator of the file doesn't have the right to change the DACL.
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I don't know what setting that is or how to recognize such a share,
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so for now we don't request WRITE_DAC on remote drives. */
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access = DELETE | FILE_GENERIC_WRITE;
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if (!pc.isremote ())
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access |= READ_CONTROL | WRITE_DAC | WRITE_OWNER;
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if ((pc.fs_flags () & FILE_SUPPORTS_TRANSACTIONS))
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start_transaction (old_trans, trans);
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retry_after_transaction_error:
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status = NtCreateFile (&fh, DELETE | FILE_GENERIC_WRITE,
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pc.get_object_attr (attr, sec_none_nih), &io,
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NULL, FILE_ATTRIBUTE_NORMAL, 0, FILE_CREATE,
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FILE_SYNCHRONOUS_IO_NONALERT
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| FILE_NON_DIRECTORY_FILE
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| FILE_OPEN_FOR_BACKUP_INTENT
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| FILE_OPEN_REPARSE_POINT,
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NULL, 0);
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if (NT_TRANSACTIONAL_ERROR (status) && trans)
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{
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stop_transaction (status, old_trans, trans);
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goto retry_after_transaction_error;
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}
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path_conv pc (in->sa_data, PC_SYM_FOLLOW);
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if (!NT_SUCCESS (status))
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{
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if (io.Information == FILE_EXISTS)
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set_errno (EADDRINUSE);
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else
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__seterrno_from_nt_status (status);
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goto out;
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}
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rp = (PREPARSE_GUID_DATA_BUFFER)
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alloca (REPARSE_GUID_DATA_BUFFER_HEADER_SIZE + data_len);
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rp->ReparseTag = IO_REPARSE_TAG_CYGUNIX;
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rp->ReparseDataLength = data_len;
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rp->Reserved = 0;
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memcpy (&rp->ReparseGuid, CYGWIN_SOCKET_GUID, sizeof (GUID));
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rep_pipe_name = (rep_pipe_name_t *) rp->GenericReparseBuffer.DataBuffer;
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rep_pipe_name->Length = pipe_name->Length;
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memcpy (rep_pipe_name->PipeName, pipe_name->Buffer, pipe_name->Length);
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rep_pipe_name->PipeName[pipe_name->Length / sizeof (WCHAR)] = L'\0';
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status = NtFsControlFile (fh, NULL, NULL, NULL, &io,
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FSCTL_SET_REPARSE_POINT, rp,
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REPARSE_GUID_DATA_BUFFER_HEADER_SIZE
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+ rp->ReparseDataLength, NULL, 0);
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if (NT_SUCCESS (status))
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{
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set_created_file_access (fh, pc, S_IRUSR | S_IWUSR
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| S_IRGRP | S_IWGRP
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| S_IROTH | S_IWOTH);
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NtClose (fh);
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/* We don't have to keep the file open, but the caller needs to
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get a value != NULL to know the file creation went fine. */
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fh = INVALID_HANDLE_VALUE;
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}
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else if (!trans)
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{
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FILE_DISPOSITION_INFORMATION fdi = { TRUE };
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__seterrno_from_nt_status (status);
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status = NtSetInformationFile (fh, &io, &fdi, sizeof fdi,
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FileDispositionInformation);
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if (!NT_SUCCESS (status))
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debug_printf ("Setting delete dispostion failed, status = %y",
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status);
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NtClose (fh);
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fh = NULL;
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}
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out:
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if (trans)
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stop_transaction (status, old_trans, trans);
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return fh;
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}
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HANDLE
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fhandler_socket_unix::create_file (const sun_name_t *sun)
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{
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if (sun->un_len <= (socklen_t) sizeof (sa_family_t)
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|| (sun->un_len == 3 && sun->un.sun_path[0] == '\0')
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|| sun->un_len > (socklen_t) sizeof sun->un)
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{
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set_errno (EINVAL);
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return NULL;
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}
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if (sun->un.sun_path[0] == '\0')
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return create_abstract_link (sun, pc.get_nt_native_path ());
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return create_reparse_point (sun, pc.get_nt_native_path ());
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}
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int
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fhandler_socket_unix::open_abstract_link (sun_name_t *sun,
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PUNICODE_STRING pipe_name)
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{
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WCHAR name[MAX_PATH];
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OBJECT_ATTRIBUTES attr;
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NTSTATUS status;
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UNICODE_STRING uname;
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HANDLE fh;
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PWCHAR p = wcpcpy (name, L"af-unix-");
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p = transform_chars_af_unix (p, sun->un.sun_path, sun->un_len);
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*p = L'\0';
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RtlInitUnicodeString (&uname, name);
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InitializeObjectAttributes (&attr, &uname, OBJ_CASE_INSENSITIVE,
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get_shared_parent_dir (), NULL);
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status = NtOpenSymbolicLinkObject (&fh, SYMBOLIC_LINK_QUERY, &attr);
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_nt_status (status);
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return -1;
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}
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if (pipe_name)
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status = NtQuerySymbolicLinkObject (fh, pipe_name, NULL);
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NtClose (fh);
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if (pipe_name)
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{
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_nt_status (status);
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return -1;
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}
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/* Enforce NUL-terminated pipe name. */
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pipe_name->Buffer[pipe_name->Length / sizeof (WCHAR)] = L'\0';
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}
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return 0;
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}
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int
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fhandler_socket_unix::open_reparse_point (sun_name_t *sun,
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PUNICODE_STRING pipe_name)
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{
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/* TODO: Open reparse point and fetch type and pipe name */
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NTSTATUS status;
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HANDLE fh;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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PREPARSE_GUID_DATA_BUFFER rp;
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tmp_pathbuf tp;
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path_conv pc (sun->un.sun_path, PC_SYM_FOLLOW);
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if (pc.error)
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{
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set_errno (pc.error);
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@ -63,30 +289,15 @@ HANDLE
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set_errno (ENOENT);
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return -1;
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}
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/* Do NOT test for the file being a socket file here. The socket file
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creation is not an atomic operation, so there is a chance that socket
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files which are just in the process of being created are recognized
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as non-socket files. To work around this problem we now create the
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file with all sharing disabled. If the below NtOpenFile fails
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with STATUS_SHARING_VIOLATION we know that the file already exists,
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but the creating process isn't finished yet. So we yield and try
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again, until we can either open the file successfully, or some error
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other than STATUS_SHARING_VIOLATION occurs.
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Since we now don't know if the file is actually a socket file, we
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perform this check here explicitely. */
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NTSTATUS status;
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HANDLE fh;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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pc.get_object_attr (attr, sec_none_nih);
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do
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{
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status = NtOpenFile (&fh, GENERIC_READ | SYNCHRONIZE, &attr, &io,
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FILE_SHARE_VALID_FLAGS,
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FILE_SYNCHRONOUS_IO_NONALERT
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| FILE_NON_DIRECTORY_FILE
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| FILE_OPEN_FOR_BACKUP_INTENT
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| FILE_NON_DIRECTORY_FILE);
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| FILE_OPEN_REPARSE_POINT);
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if (status == STATUS_SHARING_VIOLATION)
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{
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/* While we hope that the sharing violation is only temporary, we
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@ -109,53 +320,191 @@ HANDLE
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}
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}
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while (status == STATUS_SHARING_VIOLATION);
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/* Now test for the SYSTEM bit. */
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FILE_BASIC_INFORMATION fbi;
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status = NtQueryInformationFile (fh, &io, &fbi, sizeof fbi,
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FileBasicInformation);
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_nt_status (status);
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return -1;
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}
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if (!(fbi.FileAttributes & FILE_ATTRIBUTE_SYSTEM))
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{
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rp = (PREPARSE_GUID_DATA_BUFFER) tp.c_get ();
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status = NtFsControlFile (fh, NULL, NULL, NULL, &io, FSCTL_GET_REPARSE_POINT,
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NULL, 0, rp, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
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NtClose (fh);
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set_errno (EBADF);
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return -1;
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}
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/* Eventually check the content and fetch the required information. */
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char buf[128];
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memset (buf, 0, sizeof buf);
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status = NtReadFile (fh, NULL, NULL, NULL, &io, buf, 128, NULL, NULL);
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NtClose (fh);
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if (NT_SUCCESS (status))
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if (rp->ReparseTag == IO_REPARSE_TAG_CYGUNIX
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&& memcmp (CYGWIN_SOCKET_GUID, &rp->ReparseGuid, sizeof (GUID)) == 0)
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{
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#if 0 /* TODO */
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struct sockaddr_in sin;
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char ctype;
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sin.sin_family = AF_INET;
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if (strncmp (buf, SOCKET_COOKIE, strlen (SOCKET_COOKIE)))
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if (pipe_name)
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{
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set_errno (EBADF);
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return -1;
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rep_pipe_name_t *rep_pipe_name = (rep_pipe_name_t *)
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rp->GenericReparseBuffer.DataBuffer;
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pipe_name->Length = rep_pipe_name->Length;
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/* pipe name in reparse point is NUL-terminated */
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memcpy (pipe_name->Buffer, rep_pipe_name->PipeName,
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rep_pipe_name->Length + sizeof (WCHAR));
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}
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sscanf (buf + strlen (SOCKET_COOKIE), "%hu %c", &sin.sin_port, &ctype);
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sin.sin_port = htons (sin.sin_port);
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sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
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memcpy (out, &sin, sizeof sin);
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*outlen = sizeof sin;
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if (type)
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*type = (ctype == 's' ? SOCK_STREAM :
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ctype == 'd' ? SOCK_DGRAM
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: 0);
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#endif
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return 0;
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}
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__seterrno_from_nt_status (status);
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return -1;
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}
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int
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fhandler_socket_unix::open_file (sun_name_t *sun, int &type,
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PUNICODE_STRING pipe_name)
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{
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int ret = -1;
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if (sun->un_len <= (socklen_t) sizeof (sa_family_t)
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|| (sun->un_len == 3 && sun->un.sun_path[0] == '\0')
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|| sun->un_len > (socklen_t) sizeof sun->un)
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set_errno (EINVAL);
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else if (sun->un.sun_path[0] == '\0')
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ret = open_abstract_link (sun, pipe_name);
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else
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ret = open_reparse_point (sun, pipe_name);
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if (!ret)
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switch (pipe_name->Buffer[38])
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{
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case 'd':
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type = SOCK_DGRAM;
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break;
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case 's':
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type = SOCK_STREAM;
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break;
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default:
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set_errno (EINVAL);
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ret = -1;
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break;
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}
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return ret;
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}
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HANDLE
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fhandler_socket_unix::autobind (sun_name_t* sun)
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{
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uint32_t id;
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HANDLE fh;
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do
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{
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/* Use only 5 hex digits (up to 2^20 sockets) for Linux compat */
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set_unique_id ();
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id = get_unique_id () & 0xfffff;
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sun->un.sun_path[0] = '\0';
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sun->un_len = sizeof (sa_family_t)
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+ 1 /* leading NUL */
|
||||
+ __small_sprintf (sun->un.sun_path + 1, "%5X", id);
|
||||
}
|
||||
while ((fh = create_abstract_link (sun, pc.get_nt_native_path ())) == NULL);
|
||||
return fh;
|
||||
}
|
||||
|
||||
wchar_t
|
||||
fhandler_socket_unix::get_type_char ()
|
||||
{
|
||||
switch (get_socket_type ())
|
||||
{
|
||||
case SOCK_STREAM:
|
||||
return 's';
|
||||
case SOCK_DGRAM:
|
||||
return 'd';
|
||||
default:
|
||||
return '?';
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
fhandler_socket_unix::gen_pipe_name ()
|
||||
{
|
||||
WCHAR pipe_name_buf[MAX_PATH];
|
||||
UNICODE_STRING pipe_name;
|
||||
|
||||
__small_swprintf (pipe_name_buf,
|
||||
L"\\Device\\NamedPipe\\cygwin-%S-unix-%C-%016_X",
|
||||
&cygheap->installation_key,
|
||||
get_type_char (),
|
||||
get_plain_ino ());
|
||||
RtlInitUnicodeString (&pipe_name, pipe_name_buf);
|
||||
pc.set_nt_native_path (&pipe_name);
|
||||
}
|
||||
|
||||
void
|
||||
fhandler_socket_unix::set_wait_state (DWORD wait_state)
|
||||
{
|
||||
if (get_handle ())
|
||||
{
|
||||
NTSTATUS status;
|
||||
IO_STATUS_BLOCK io;
|
||||
FILE_PIPE_INFORMATION fpi;
|
||||
|
||||
fpi.ReadMode = FILE_PIPE_MESSAGE_MODE;
|
||||
fpi.CompletionMode = wait_state;
|
||||
status = NtSetInformationFile (get_handle (), &io, &fpi, sizeof fpi,
|
||||
FilePipeInformation);
|
||||
if (!NT_SUCCESS (status))
|
||||
system_printf ("NtSetInformationFile(FilePipeInformation): %y", status);
|
||||
}
|
||||
}
|
||||
|
||||
HANDLE
|
||||
fhandler_socket_unix::create_pipe ()
|
||||
{
|
||||
NTSTATUS status;
|
||||
HANDLE ph;
|
||||
ACCESS_MASK access;
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
IO_STATUS_BLOCK io;
|
||||
ULONG sharing;
|
||||
ULONG nonblocking;
|
||||
ULONG max_instances;
|
||||
LARGE_INTEGER timeout;
|
||||
|
||||
access = GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE;
|
||||
sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
|
||||
InitializeObjectAttributes (&attr, pc.get_nt_native_path (), OBJ_INHERIT,
|
||||
NULL, NULL);
|
||||
nonblocking = is_nonblocking () ? FILE_PIPE_COMPLETE_OPERATION
|
||||
: FILE_PIPE_QUEUE_OPERATION;
|
||||
max_instances = (get_socket_type () == SOCK_DGRAM) ? 1 : -1;
|
||||
timeout.QuadPart = -500000;
|
||||
status = NtCreateNamedPipeFile (&ph, access, &attr, &io, sharing,
|
||||
FILE_CREATE, FILE_SYNCHRONOUS_IO_NONALERT,
|
||||
FILE_PIPE_MESSAGE_TYPE,
|
||||
FILE_PIPE_MESSAGE_MODE,
|
||||
nonblocking, max_instances,
|
||||
PREFERRED_IO_BLKSIZE, PREFERRED_IO_BLKSIZE,
|
||||
&timeout);
|
||||
if (!NT_SUCCESS (status))
|
||||
system_printf ("NtCreateNamedPipeFile: %y", status);
|
||||
return ph;
|
||||
}
|
||||
|
||||
HANDLE
|
||||
fhandler_socket_unix::create_pipe_instance ()
|
||||
{
|
||||
NTSTATUS status;
|
||||
HANDLE ph;
|
||||
ACCESS_MASK access;
|
||||
OBJECT_ATTRIBUTES attr;
|
||||
IO_STATUS_BLOCK io;
|
||||
ULONG sharing;
|
||||
ULONG nonblocking;
|
||||
ULONG max_instances;
|
||||
LARGE_INTEGER timeout;
|
||||
|
||||
access = GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE;
|
||||
sharing = FILE_SHARE_READ | FILE_SHARE_WRITE;
|
||||
InitializeObjectAttributes (&attr, pc.get_nt_native_path (), OBJ_INHERIT,
|
||||
NULL, NULL);
|
||||
nonblocking = is_nonblocking () ? FILE_PIPE_COMPLETE_OPERATION
|
||||
: FILE_PIPE_QUEUE_OPERATION;
|
||||
max_instances = (get_socket_type () == SOCK_DGRAM) ? 1 : -1;
|
||||
timeout.QuadPart = -500000;
|
||||
status = NtCreateNamedPipeFile (&ph, access, &attr, &io, sharing,
|
||||
FILE_OPEN, FILE_SYNCHRONOUS_IO_NONALERT,
|
||||
FILE_PIPE_MESSAGE_TYPE,
|
||||
FILE_PIPE_MESSAGE_MODE,
|
||||
nonblocking, max_instances,
|
||||
PREFERRED_IO_BLKSIZE, PREFERRED_IO_BLKSIZE,
|
||||
&timeout);
|
||||
if (!NT_SUCCESS (status))
|
||||
system_printf ("NtCreateNamedPipeFile: %y", status);
|
||||
return ph;
|
||||
}
|
||||
|
||||
fhandler_socket_unix::fhandler_socket_unix () :
|
||||
sun_path (NULL),
|
||||
peer_sun_path (NULL)
|
||||
|
|
@ -218,8 +567,16 @@ fhandler_socket_unix::socket (int af, int type, int protocol, int flags)
|
|||
set_errno (EPROTONOSUPPORT);
|
||||
return -1;
|
||||
}
|
||||
set_errno (EAFNOSUPPORT);
|
||||
return -1;
|
||||
set_addr_family (af);
|
||||
set_socket_type (type);
|
||||
if (flags & SOCK_NONBLOCK)
|
||||
set_nonblocking (true);
|
||||
if (flags & SOCK_CLOEXEC)
|
||||
set_close_on_exec (true);
|
||||
set_io_handle (NULL);
|
||||
set_unique_id ();
|
||||
set_ino (get_unique_id ());
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
|
|
@ -243,7 +600,34 @@ fhandler_socket_unix::socketpair (int af, int type, int protocol, int flags,
|
|||
int
|
||||
fhandler_socket_unix::bind (const struct sockaddr *name, int namelen)
|
||||
{
|
||||
set_errno (EAFNOSUPPORT);
|
||||
__try
|
||||
{
|
||||
sun_name_t sun (name, namelen);
|
||||
bool unnamed = (sun.un_len == sizeof sun.un.sun_family);
|
||||
HANDLE pipe = NULL;
|
||||
|
||||
if (get_handle ())
|
||||
{
|
||||
set_errno (EINVAL);
|
||||
__leave;
|
||||
}
|
||||
gen_pipe_name ();
|
||||
pipe = create_pipe ();
|
||||
if (pipe)
|
||||
{
|
||||
file = unnamed ? autobind (&sun) : create_file (&sun);
|
||||
if (!file)
|
||||
{
|
||||
NtClose (pipe);
|
||||
__leave;
|
||||
}
|
||||
set_io_handle (pipe);
|
||||
set_sun_path (&sun);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
__except (EFAULT) {}
|
||||
__endtry
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
|
@ -312,8 +696,11 @@ fhandler_socket_unix::shutdown (int how)
|
|||
int
|
||||
fhandler_socket_unix::close ()
|
||||
{
|
||||
set_errno (EAFNOSUPPORT);
|
||||
return -1;
|
||||
if (get_handle ())
|
||||
NtClose (get_handle ());
|
||||
if (file && file != INVALID_HANDLE_VALUE)
|
||||
NtClose (file);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
|
|
|
|||
Loading…
Reference in New Issue