668 lines
14 KiB
C++
668 lines
14 KiB
C++
/* fhandler_socket_unix.cc.
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See fhandler.h for a description of the fhandler classes.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <w32api/winioctl.h>
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#include <asm/byteorder.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/param.h>
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#include <sys/statvfs.h>
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#include <cygwin/acl.h>
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#include "cygerrno.h"
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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 "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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/* 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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{
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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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{
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/* TODO */
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return 0;
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}
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path_conv pc (in->sa_data, 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 -1;
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}
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if (!pc.exists ())
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{
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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_OPEN_FOR_BACKUP_INTENT
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| FILE_NON_DIRECTORY_FILE);
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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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also could easily get stuck here, waiting for a file in use by
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some greedy Win32 application. Therefore we should never wait
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endlessly without checking for signals and thread cancel event. */
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pthread_testcancel ();
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if (cygwait (NULL, cw_nowait, cw_sig_eintr) == WAIT_SIGNALED
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&& !_my_tls.call_signal_handler ())
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{
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set_errno (EINTR);
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return -1;
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}
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yield ();
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}
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else 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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}
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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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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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{
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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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{
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set_errno (EBADF);
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return -1;
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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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fhandler_socket_unix::fhandler_socket_unix () :
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sun_path (NULL),
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peer_sun_path (NULL)
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{
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set_cred ();
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}
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fhandler_socket_unix::~fhandler_socket_unix ()
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{
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if (sun_path)
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cfree (sun_path);
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if (peer_sun_path)
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cfree (peer_sun_path);
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}
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void
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fhandler_socket_unix::set_sun_path (const char *path)
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{
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sun_path = path ? cstrdup (path) : NULL;
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}
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void
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fhandler_socket_unix::set_peer_sun_path (const char *path)
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{
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peer_sun_path = path ? cstrdup (path) : NULL;
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}
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void
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fhandler_socket_unix::set_cred ()
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{
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sec_pid = getpid ();
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sec_uid = geteuid32 ();
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sec_gid = getegid32 ();
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sec_peer_pid = (pid_t) 0;
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sec_peer_uid = (uid_t) -1;
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sec_peer_gid = (gid_t) -1;
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}
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int
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fhandler_socket_unix::dup (fhandler_base *child, int flags)
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{
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fhandler_socket_unix *fhs = (fhandler_socket_unix *) child;
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fhs->set_sun_path (get_sun_path ());
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fhs->set_peer_sun_path (get_peer_sun_path ());
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return fhandler_socket::dup (child, flags);
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}
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int
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fhandler_socket_unix::socket (int af, int type, int protocol, int flags)
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{
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if (type != SOCK_STREAM && type != SOCK_DGRAM)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (protocol != 0)
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{
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set_errno (EPROTONOSUPPORT);
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return -1;
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}
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::socketpair (int af, int type, int protocol, int flags,
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fhandler_socket *fh_out)
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{
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if (type != SOCK_STREAM && type != SOCK_DGRAM)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (protocol != 0)
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{
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set_errno (EPROTONOSUPPORT);
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return -1;
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}
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::bind (const struct sockaddr *name, int namelen)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::listen (int backlog)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::accept4 (struct sockaddr *peer, int *len, int flags)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::connect (const struct sockaddr *name, int namelen)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::getsockname (struct sockaddr *name, int *namelen)
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{
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struct sockaddr_un sun;
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sun.sun_family = AF_UNIX;
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sun.sun_path[0] = '\0';
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if (get_sun_path ())
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strncat (sun.sun_path, get_sun_path (), UNIX_PATH_MAX - 1);
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memcpy (name, &sun, MIN (*namelen, (int) SUN_LEN (&sun) + 1));
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*namelen = (int) SUN_LEN (&sun) + (get_sun_path () ? 1 : 0);
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return 0;
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}
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int
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fhandler_socket_unix::getpeername (struct sockaddr *name, int *namelen)
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{
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struct sockaddr_un sun;
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memset (&sun, 0, sizeof sun);
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sun.sun_family = AF_UNIX;
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sun.sun_path[0] = '\0';
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if (get_peer_sun_path ())
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strncat (sun.sun_path, get_peer_sun_path (), UNIX_PATH_MAX - 1);
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memcpy (name, &sun, MIN (*namelen, (int) SUN_LEN (&sun) + 1));
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*namelen = (int) SUN_LEN (&sun) + (get_peer_sun_path () ? 1 : 0);
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return 0;
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}
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int
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fhandler_socket_unix::shutdown (int how)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::close ()
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::getpeereid (pid_t *pid, uid_t *euid, gid_t *egid)
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{
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if (get_socket_type () != SOCK_STREAM)
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{
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set_errno (EINVAL);
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return -1;
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}
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if (connect_state () != connected)
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{
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set_errno (ENOTCONN);
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return -1;
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}
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__try
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{
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if (pid)
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*pid = sec_peer_pid;
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if (euid)
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*euid = sec_peer_uid;
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if (egid)
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*egid = sec_peer_gid;
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return 0;
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}
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__except (EFAULT) {}
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__endtry
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return -1;
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}
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ssize_t
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fhandler_socket_unix::recvfrom (void *ptr, size_t len, int flags,
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struct sockaddr *from, int *fromlen)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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ssize_t
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fhandler_socket_unix::recvmsg (struct msghdr *msg, int flags)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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void __reg3
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fhandler_socket_unix::read (void *ptr, size_t& len)
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{
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set_errno (EAFNOSUPPORT);
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len = 0;
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}
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ssize_t __stdcall
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fhandler_socket_unix::readv (const struct iovec *, int iovcnt, ssize_t tot)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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ssize_t
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fhandler_socket_unix::sendto (const void *in_ptr, size_t len, int flags,
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const struct sockaddr *to, int tolen)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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ssize_t
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fhandler_socket_unix::sendmsg (const struct msghdr *msg, int flags)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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ssize_t __stdcall
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fhandler_socket_unix::write (const void *ptr, size_t len)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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ssize_t __stdcall
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fhandler_socket_unix::writev (const struct iovec *, int iovcnt, ssize_t tot)
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{
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set_errno (EAFNOSUPPORT);
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return -1;
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}
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int
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fhandler_socket_unix::setsockopt (int level, int optname, const void *optval,
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socklen_t optlen)
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{
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/* Preprocessing setsockopt. */
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switch (level)
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{
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case SOL_SOCKET:
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switch (optname)
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{
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case SO_PASSCRED:
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break;
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case SO_REUSEADDR:
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saw_reuseaddr (*(int *) optval);
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break;
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case SO_RCVBUF:
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rmem (*(int *) optval);
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break;
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case SO_SNDBUF:
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wmem (*(int *) optval);
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break;
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case SO_RCVTIMEO:
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case SO_SNDTIMEO:
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if (optlen < (socklen_t) sizeof (struct timeval))
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{
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set_errno (EINVAL);
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return -1;
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}
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if (!timeval_to_ms ((struct timeval *) optval,
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(optname == SO_RCVTIMEO) ? rcvtimeo ()
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: sndtimeo ()))
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{
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set_errno (EDOM);
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return -1;
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}
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break;
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default:
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/* AF_UNIX sockets simply ignore all other SOL_SOCKET options. */
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break;
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}
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break;
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default:
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set_errno (ENOPROTOOPT);
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return -1;
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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::getsockopt (int level, int optname, const void *optval,
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socklen_t *optlen)
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{
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/* Preprocessing getsockopt.*/
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switch (level)
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{
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case SOL_SOCKET:
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switch (optname)
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{
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case SO_ERROR:
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{
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int *e = (int *) optval;
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*e = 0;
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break;
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}
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case SO_PASSCRED:
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break;
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case SO_PEERCRED:
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{
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struct ucred *cred = (struct ucred *) optval;
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if (*optlen < (socklen_t) sizeof *cred)
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{
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set_errno (EINVAL);
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return -1;
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}
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int ret = getpeereid (&cred->pid, &cred->uid, &cred->gid);
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if (!ret)
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*optlen = (socklen_t) sizeof *cred;
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return ret;
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}
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case SO_REUSEADDR:
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{
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unsigned int *reuseaddr = (unsigned int *) optval;
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if (*optlen < (socklen_t) sizeof *reuseaddr)
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{
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set_errno (EINVAL);
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return -1;
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}
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*reuseaddr = saw_reuseaddr();
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*optlen = (socklen_t) sizeof *reuseaddr;
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break;
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}
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case SO_RCVTIMEO:
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case SO_SNDTIMEO:
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{
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struct timeval *time_out = (struct timeval *) optval;
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if (*optlen < (socklen_t) sizeof *time_out)
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{
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set_errno (EINVAL);
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return -1;
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}
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DWORD ms = (optname == SO_RCVTIMEO) ? rcvtimeo () : sndtimeo ();
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if (ms == 0 || ms == INFINITE)
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{
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time_out->tv_sec = 0;
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time_out->tv_usec = 0;
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}
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else
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{
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time_out->tv_sec = ms / MSPERSEC;
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time_out->tv_usec = ((ms % MSPERSEC) * USPERSEC) / MSPERSEC;
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}
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*optlen = (socklen_t) sizeof *time_out;
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break;
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}
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case SO_TYPE:
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{
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unsigned int *type = (unsigned int *) optval;
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*type = get_socket_type ();
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*optlen = (socklen_t) sizeof *type;
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break;
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}
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/* AF_UNIX sockets simply ignore all other SOL_SOCKET options. */
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case SO_LINGER:
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{
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struct linger *linger = (struct linger *) optval;
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memset (linger, 0, sizeof *linger);
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*optlen = (socklen_t) sizeof *linger;
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break;
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}
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default:
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{
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unsigned int *val = (unsigned int *) optval;
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*val = 0;
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*optlen = (socklen_t) sizeof *val;
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break;
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}
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}
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break;
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default:
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set_errno (ENOPROTOOPT);
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return -1;
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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::ioctl (unsigned int cmd, void *p)
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{
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int ret;
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switch (cmd)
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{
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case FIOASYNC:
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#ifdef __x86_64__
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case _IOW('f', 125, int):
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#endif
|
|
break;
|
|
case FIONREAD:
|
|
#ifdef __x86_64__
|
|
case _IOR('f', 127, int):
|
|
#endif
|
|
case FIONBIO:
|
|
case SIOCATMARK:
|
|
break;
|
|
default:
|
|
ret = fhandler_socket::ioctl (cmd, p);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
fhandler_socket_unix::fcntl (int cmd, intptr_t arg)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (cmd)
|
|
{
|
|
case F_SETOWN:
|
|
break;
|
|
case F_GETOWN:
|
|
break;
|
|
default:
|
|
ret = fhandler_socket::fcntl (cmd, arg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int __reg2
|
|
fhandler_socket_unix::fstat (struct stat *buf)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::fstat (buf);
|
|
ret = fhandler_base::fstat_fs (buf);
|
|
if (!ret)
|
|
{
|
|
buf->st_mode = (buf->st_mode & ~S_IFMT) | S_IFSOCK;
|
|
buf->st_size = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int __reg2
|
|
fhandler_socket_unix::fstatvfs (struct statvfs *sfs)
|
|
{
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::fstatvfs (sfs);
|
|
fhandler_disk_file fh (pc);
|
|
fh.get_device () = FH_FS;
|
|
return fh.fstatvfs (sfs);
|
|
}
|
|
|
|
int
|
|
fhandler_socket_unix::fchmod (mode_t newmode)
|
|
{
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::fchmod (newmode);
|
|
fhandler_disk_file fh (pc);
|
|
fh.get_device () = FH_FS;
|
|
/* Kludge: Don't allow to remove read bit on socket files for
|
|
user/group/other, if the accompanying write bit is set. It would
|
|
be nice to have exact permissions on a socket file, but it's
|
|
necessary that somebody able to access the socket can always read
|
|
the contents of the socket file to avoid spurious "permission
|
|
denied" messages. */
|
|
newmode |= (newmode & (S_IWUSR | S_IWGRP | S_IWOTH)) << 1;
|
|
return fh.fchmod (S_IFSOCK | newmode);
|
|
}
|
|
|
|
int
|
|
fhandler_socket_unix::fchown (uid_t uid, gid_t gid)
|
|
{
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::fchown (uid, gid);
|
|
fhandler_disk_file fh (pc);
|
|
return fh.fchown (uid, gid);
|
|
}
|
|
|
|
int
|
|
fhandler_socket_unix::facl (int cmd, int nentries, aclent_t *aclbufp)
|
|
{
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::facl (cmd, nentries, aclbufp);
|
|
fhandler_disk_file fh (pc);
|
|
return fh.facl (cmd, nentries, aclbufp);
|
|
}
|
|
|
|
int
|
|
fhandler_socket_unix::link (const char *newpath)
|
|
{
|
|
if (!get_sun_path () || get_sun_path ()[0] == '\0')
|
|
return fhandler_socket::link (newpath);
|
|
fhandler_disk_file fh (pc);
|
|
return fh.link (newpath);
|
|
}
|