525 lines
12 KiB
C++
525 lines
12 KiB
C++
/* client.cc
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Written by Egor Duda <deo@logos-m.ru>
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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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/* to allow this to link into cygwin and the .dll, a little magic is needed. */
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#ifdef __OUTSIDE_CYGWIN__
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#include "woutsup.h"
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#else
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#include "winsup.h"
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "cygserver_msg.h"
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#include "cygserver_sem.h"
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#include "cygserver_shm.h"
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#include "cygserver_setpwd.h"
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#include "cygserver_pwdgrp.h"
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#include "cygserver.h"
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#include "transport.h"
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int cygserver_running = CYGSERVER_UNKNOWN; // Nb: inherited by children.
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client_request_get_version::client_request_get_version ()
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: client_request (CYGSERVER_REQUEST_GET_VERSION, &version, sizeof (version))
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{
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msglen (0); // No parameters for request.
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// verbose: syscall_printf ("created");
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}
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/*
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* client_request_get_version::check_version ()
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*
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* The major version and API version numbers must match exactly. An
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* older than expected minor version number is accepted (as long as
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* the first numbers match, that is).
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*/
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#ifdef __INSIDE_CYGWIN__
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bool
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client_request_get_version::check_version () const
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{
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const bool ok = (version.major == CYGWIN_SERVER_VERSION_MAJOR
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&& version.api == CYGWIN_SERVER_VERSION_API
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&& version.minor <= CYGWIN_SERVER_VERSION_MINOR);
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if (!ok)
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syscall_printf (("incompatible version of cygwin server: "
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"client version %d.%d.%d.%d, "
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"server version %d.%d.%d.%d"),
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CYGWIN_SERVER_VERSION_MAJOR,
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CYGWIN_SERVER_VERSION_API,
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CYGWIN_SERVER_VERSION_MINOR,
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CYGWIN_SERVER_VERSION_PATCH,
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version.major,
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version.api,
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version.minor,
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version.patch);
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return ok;
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}
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client_request_attach_tty::client_request_attach_tty (DWORD nmaster_pid,
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HANDLE nfrom_master,
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HANDLE nto_master)
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: client_request (CYGSERVER_REQUEST_ATTACH_TTY, &req, sizeof (req))
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{
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req.pid = GetCurrentProcessId ();
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req.master_pid = nmaster_pid;
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req.from_master = nfrom_master;
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req.to_master = nto_master;
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syscall_printf (("created: pid = %u, master_pid = %u, "
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"from_master = %p, to_master = %p"),
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req.pid, req.master_pid, req.from_master, req.to_master);
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}
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#endif /* __INSIDE_CYGWIN__ */
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/*
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* client_request_attach_tty::send ()
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*
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* Wraps the base method to provide error handling support. If the
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* reply contains a body but is flagged as an error, close any handles
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* that have been returned by cygserver and then discard the message
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* body, i.e. the client either sees a successful result with handles
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* or an unsuccessful result with no handles.
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*/
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void
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client_request_attach_tty::send (transport_layer_base * const conn)
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{
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client_request::send (conn);
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if (msglen () && error_code ())
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{
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if (from_master ())
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CloseHandle (from_master ());
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if (to_master ())
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CloseHandle (to_master ());
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msglen (0);
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}
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}
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client_request::header_t::header_t (const request_code_t request_code,
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const size_t len)
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: request_code (request_code)
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{
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assert (request_code >= 0 && request_code < CYGSERVER_REQUEST_LAST);
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msglen = len;
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}
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// FIXME: also check write and read result for -1.
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void
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client_request::send (transport_layer_base * const conn)
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{
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assert (conn);
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assert (!(msglen () && !_buf)); // i.e., msglen () implies _buf
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assert (msglen () <= _buflen);
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{
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const ssize_t count = conn->write (&_header, sizeof (_header));
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if (count != sizeof (_header))
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("request header write failure: "
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"only %ld bytes sent of %lu, "
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"error = %d(%u)"),
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count, sizeof (_header),
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errno, GetLastError ());
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return;
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}
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}
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if (msglen ())
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{
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const ssize_t count = conn->write (_buf, msglen ());
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if (count == -1 || (size_t) count != msglen ())
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("request body write failure: "
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"only %ld bytes sent of %lu, "
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"error = %d(%u)"),
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count, msglen (),
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errno, GetLastError ());
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return;
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}
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}
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{
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const ssize_t count = conn->read (&_header, sizeof (_header));
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if (count != sizeof (_header))
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("reply header read failure: "
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"only %ld bytes received of %lu, "
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"error = %d(%u)"),
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count, sizeof (_header),
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errno, GetLastError ());
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return;
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}
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}
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if (msglen () && !_buf)
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{
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system_printf ("no client buffer for reply body: %lu bytes needed",
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msglen ());
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error_code (EINVAL);
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return;
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}
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if (msglen () > _buflen)
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{
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system_printf (("client buffer too small for reply body: "
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"have %lu bytes and need %lu"),
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_buflen, msglen ());
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error_code (EINVAL);
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return;
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}
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if (msglen ())
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{
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const ssize_t count = conn->read (_buf, msglen ());
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if (count == -1 || (size_t) count != msglen ())
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("reply body read failure: "
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"only %ld bytes received of %lu, "
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"error = %d(%u)"),
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count, msglen (),
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errno, GetLastError ());
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return;
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}
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}
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}
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#ifdef __OUTSIDE_CYGWIN__
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client_request_attach_tty::client_request_attach_tty ()
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: client_request (CYGSERVER_REQUEST_ATTACH_TTY, &req, sizeof (req))
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{
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}
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/*
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* client_request::handle_request ()
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*
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* A server-side method.
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*
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* This is a factory method for the client_request subclasses. It
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* reads the incoming request header and, based on its request code,
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* creates an instance of the appropriate class.
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*
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* FIXME: If the incoming packet is malformed, the server drops it on
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* the floor. Should it try and generate some sort of reply for the
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* client? As it is, the client will simply get a broken connection.
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*
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* FIXME: also check write and read result for -1.
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*/
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/* static */ void
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client_request::handle_request (transport_layer_base *const conn,
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process_cache *const cache)
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{
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// verbose: debug_printf ("about to read");
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header_t header;
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{
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const ssize_t count = conn->read (&header, sizeof (header));
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if (count != sizeof (header))
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{
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syscall_printf (("request header read failure: "
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"only %ld bytes received of %lu, "
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"error = %d(%u)"),
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count, sizeof (header),
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errno, GetLastError ());
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return;
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}
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}
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client_request *req = NULL;
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switch (header.request_code)
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{
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case CYGSERVER_REQUEST_GET_VERSION:
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req = new client_request_get_version;
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break;
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case CYGSERVER_REQUEST_SHUTDOWN:
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req = new client_request_shutdown;
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break;
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case CYGSERVER_REQUEST_ATTACH_TTY:
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req = new client_request_attach_tty;
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break;
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case CYGSERVER_REQUEST_MSG:
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req = new client_request_msg;
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break;
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case CYGSERVER_REQUEST_SEM:
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req = new client_request_sem;
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break;
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case CYGSERVER_REQUEST_SHM:
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req = new client_request_shm;
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break;
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case CYGSERVER_REQUEST_SETPWD:
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req = new client_request_setpwd;
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break;
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case CYGSERVER_REQUEST_PWDGRP:
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req = new client_request_pwdgrp;
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break;
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default:
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syscall_printf ("unknown request code %d received: request ignored",
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header.request_code);
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return;
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}
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assert (req);
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req->msglen (header.msglen);
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req->handle (conn, cache);
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delete req;
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}
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/*
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* client_request::handle ()
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*
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* A server-side method.
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*
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* At this point, the header of an incoming request has been read and
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* an appropriate client_request object constructed. This method has
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* to read the request body into its buffer, if there is such a body,
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* then perform the request and send back the results to the client.
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*
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* FIXME: If the incoming packet is malformed, the server drops it on
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* the floor. Should it try and generate some sort of reply for the
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* client? As it is, the client will simply get a broken connection.
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*
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* FIXME: also check write and read result for -1.
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*/
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void
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client_request::handle (transport_layer_base *const conn,
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process_cache *const cache)
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{
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if (msglen () && !_buf)
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{
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system_printf ("no buffer for request body: %lu bytes needed",
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msglen ());
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error_code (EINVAL);
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return;
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}
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if (msglen () > _buflen)
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{
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system_printf (("buffer too small for request body: "
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"have %lu bytes and need %lu"),
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_buflen, msglen ());
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error_code (EINVAL);
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return;
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}
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if (msglen ())
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{
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const ssize_t count = conn->read (_buf, msglen ());
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if (count == -1 || (size_t) count != msglen ())
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("request body read failure: "
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"only %ld bytes received of %lu, "
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"error = %d(%u)"),
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count, msglen (),
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errno, GetLastError ());
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return;
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}
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}
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error_code (0); // Overwrites the _header.request_code field.
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/*
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* This is not allowed to fail. We must return ENOSYS at a minimum
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* to the client.
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*/
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serve (conn, cache);
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{
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const ssize_t count = conn->write (&_header, sizeof (_header));
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if (count != sizeof (_header))
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("reply header write failure: "
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"only %ld bytes sent of %lu, "
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"error = %d(%u)"),
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count, sizeof (_header),
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errno, GetLastError ());
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return;
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}
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}
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if (msglen ())
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{
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const ssize_t count = conn->write (_buf, msglen ());
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if (count == -1 || (size_t) count != msglen ())
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{
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assert (errno);
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error_code (errno);
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syscall_printf (("reply body write failure: "
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"only %ld bytes sent of %lu, "
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"error = %d(%u)"),
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count, msglen (),
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errno, GetLastError ());
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return;
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}
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}
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}
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/* The server side implementation of make_request. Very simple. */
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int
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client_request::make_request ()
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{
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transport_layer_base *const transport = create_server_transport ();
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assert (transport);
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if (transport->connect () == -1)
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{
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if (errno)
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error_code (errno);
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else
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error_code (ENOSYS);
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delete transport;
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return -1;
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}
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send (transport);
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delete transport;
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return 0;
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}
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#endif /* __OUTSIDE_CYGWIN__ */
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client_request::client_request (request_code_t const id,
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void * const buf,
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size_t const buflen)
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: _header (id, buflen),
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_buf (buf),
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_buflen (buflen)
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{
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assert ((!_buf && !_buflen) || (_buf && _buflen));
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}
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client_request::~client_request ()
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{}
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#ifdef __INSIDE_CYGWIN__
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int
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client_request::make_request ()
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{
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assert (cygserver_running == CYGSERVER_UNKNOWN \
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|| cygserver_running == CYGSERVER_OK \
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|| cygserver_running == CYGSERVER_UNAVAIL);
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if (cygserver_running == CYGSERVER_UNKNOWN)
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cygserver_init ();
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assert (cygserver_running == CYGSERVER_OK \
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|| cygserver_running == CYGSERVER_UNAVAIL);
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/* Don't retry every request if the server's not there */
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if (cygserver_running == CYGSERVER_UNAVAIL)
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{
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syscall_printf ("cygserver un-available");
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error_code (ENOSYS);
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return -1;
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}
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transport_layer_base *const transport = create_server_transport ();
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assert (transport);
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if (transport->connect () == -1)
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{
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if (errno)
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error_code (errno);
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else
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error_code (ENOSYS);
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delete transport;
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return -1;
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}
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// verbose: debug_printf ("connected to server %p", transport);
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send (transport);
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delete transport;
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return 0;
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}
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bool
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check_cygserver_available ()
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{
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assert (cygserver_running == CYGSERVER_UNKNOWN \
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|| cygserver_running == CYGSERVER_UNAVAIL);
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cygserver_running = CYGSERVER_OK; // For make_request ().
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client_request_get_version req;
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/* This indicates that we failed to connect to cygserver at all but
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* that's fine as cygwin doesn't need it to be running.
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*/
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if (req.make_request () == -1)
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return false;
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/* We connected to the server but something went wrong after that
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* (in sending the message, in cygserver itself, or in receiving the
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* reply).
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*/
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if (req.error_code ())
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{
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syscall_printf ("failure in cygserver version request: %d",
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req.error_code ());
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syscall_printf ("process will continue without cygserver support");
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return false;
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}
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return req.check_version ();
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}
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void
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cygserver_init ()
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{
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assert (cygserver_running == CYGSERVER_UNKNOWN \
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|| cygserver_running == CYGSERVER_OK \
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|| cygserver_running == CYGSERVER_UNAVAIL);
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if (cygserver_running == CYGSERVER_OK)
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return;
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if (!check_cygserver_available ())
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cygserver_running = CYGSERVER_UNAVAIL;
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}
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#endif /* __INSIDE_CYGWIN__ */
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