d89cc26903
* external.cc (cygwin_internal): Add operation to retrieve a copy of the EXCEPTION_RECORD from a siginfo_t *. * include/sys/cygwin.h (cygwin_getinfo_types): Ditto. * exception.h (cygwin_exception): Add exception_record accessor. Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
711 lines
16 KiB
C++
711 lines
16 KiB
C++
/* external.cc: Interface to Cygwin internals from external programs.
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Copyright 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
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2008, 2009, 2010, 2011, 2012, 2014 Red Hat, Inc.
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Written by Christopher Faylor <cgf@cygnus.com>
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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 "sigproc.h"
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#include "pinfo.h"
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#include "shared_info.h"
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#include "cygwin_version.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 "cygheap.h"
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#include "heap.h"
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#include "cygtls.h"
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#include "child_info.h"
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#include "environ.h"
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#include "cygserver_setpwd.h"
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#include "pwdgrp.h"
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#include "exception.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <iptypes.h>
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child_info *get_cygwin_startup_info ();
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static void exit_process (UINT, bool) __attribute__((noreturn));
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static winpids pids;
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static external_pinfo *
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fillout_pinfo (pid_t pid, int winpid)
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{
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BOOL nextpid;
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static external_pinfo ep;
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static char ep_progname_long_buf[NT_MAX_PATH];
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if ((nextpid = !!(pid & CW_NEXTPID)))
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pid ^= CW_NEXTPID;
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static unsigned int i;
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if (!pids.npids || !nextpid)
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{
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pids.set (winpid);
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i = 0;
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}
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if (!pid)
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i = 0;
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memset (&ep, 0, sizeof ep);
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while (i < pids.npids)
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{
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DWORD thispid = pids.winpid (i);
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_pinfo *p = pids[i];
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i++;
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if (!p)
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{
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if (!nextpid && thispid != (DWORD) pid)
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continue;
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ep.pid = cygwin_pid (thispid);
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ep.dwProcessId = thispid;
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ep.process_state = PID_IN_USE;
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ep.ctty = -1;
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break;
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}
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else if (nextpid || p->pid == pid || (winpid && thispid == (DWORD) pid))
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{
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ep.ctty = (p->ctty < 0 || iscons_dev (p->ctty)) ? p->ctty : device::minor (p->ctty);
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ep.pid = p->pid;
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ep.ppid = p->ppid;
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ep.dwProcessId = p->dwProcessId;
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ep.uid = p->uid;
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ep.gid = p->gid;
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ep.pgid = p->pgid;
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ep.sid = p->sid;
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ep.umask = 0;
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ep.start_time = p->start_time;
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ep.rusage_self = p->rusage_self;
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ep.rusage_children = p->rusage_children;
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ep.progname[0] = '\0';
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sys_wcstombs(ep.progname, MAX_PATH, p->progname);
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ep.strace_mask = 0;
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ep.version = EXTERNAL_PINFO_VERSION;
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ep.process_state = p->process_state;
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ep.uid32 = p->uid;
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ep.gid32 = p->gid;
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ep.progname_long = ep_progname_long_buf;
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mount_table->conv_to_posix_path (p->progname, ep.progname_long, 0);
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break;
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}
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}
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if (!ep.pid)
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{
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i = 0;
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pids.reset ();
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return NULL;
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}
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return &ep;
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}
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static inline uintptr_t
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get_cygdrive_info (char *user, char *system, char *user_flags,
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char *system_flags)
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{
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int res = mount_table->get_cygdrive_info (user, system, user_flags,
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system_flags);
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return (res == ERROR_SUCCESS) ? 1 : 0;
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}
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static bool
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check_ntsec (const char *filename)
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{
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if (!filename)
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return true;
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path_conv pc (filename);
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return pc.has_acls ();
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}
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/* Copy cygwin environment variables to the Windows environment. */
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static PWCHAR
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create_winenv (const char * const *env)
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{
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int unused_envc;
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PWCHAR envblock = NULL;
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char **envp = build_env (env ?: cur_environ (), envblock, unused_envc, false,
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NULL);
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PWCHAR p = envblock;
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if (envp)
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{
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for (char **e = envp; *e; e++)
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cfree (*e);
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cfree (envp);
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}
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/* If we got an env block, just return pointer to win env. */
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if (env)
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return envblock;
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/* Otherwise sync win env of current process with its posix env. */
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if (!p)
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return NULL;
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while (*p)
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{
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PWCHAR eq = wcschr (p, L'=');
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if (eq)
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{
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*eq = L'\0';
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SetEnvironmentVariableW (p, ++eq);
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p = eq;
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}
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p = wcschr (p, L'\0') + 1;
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}
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free (envblock);
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return NULL;
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}
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/*
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* Cygwin-specific wrapper for win32 ExitProcess and TerminateProcess.
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* It ensures that the correct exit code, derived from the specified
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* status value, will be made available to this process's parent (if
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* that parent is also a cygwin process). If useTerminateProcess is
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* true, then TerminateProcess(GetCurrentProcess(),...) will be used;
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* otherwise, ExitProcess(...) is called.
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*
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* Used by startup code for cygwin processes which is linked statically
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* into applications, and is not part of the cygwin DLL -- which is why
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* this interface is exposed. "Normal" programs should use ANSI exit(),
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* ANSI abort(), or POSIX _exit(), rather than this function -- because
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* calling ExitProcess or TerminateProcess, even through this wrapper,
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* skips much of the cygwin process cleanup code.
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*/
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static void
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exit_process (UINT status, bool useTerminateProcess)
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{
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pid_t pid = getpid ();
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external_pinfo *ep = fillout_pinfo (pid, 1);
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DWORD dwpid = ep ? ep->dwProcessId : pid;
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pinfo p (pid, PID_MAP_RW);
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if (ep)
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pid = ep->pid;
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if ((dwpid == GetCurrentProcessId()) && (p->pid == pid))
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p.set_exit_code ((DWORD)status);
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if (useTerminateProcess)
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TerminateProcess (GetCurrentProcess(), status);
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/* avoid 'else' clause to silence warning */
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ExitProcess (status);
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}
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extern "C" uintptr_t
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cygwin_internal (cygwin_getinfo_types t, ...)
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{
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va_list arg;
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uintptr_t res = (uintptr_t) -1;
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va_start (arg, t);
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switch (t)
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{
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case CW_LOCK_PINFO:
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res = 1;
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break;
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case CW_UNLOCK_PINFO:
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res = 1;
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break;
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case CW_GETTHREADNAME:
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res = (uintptr_t) cygthread::name (va_arg (arg, DWORD));
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break;
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case CW_SETTHREADNAME:
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{
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set_errno (ENOSYS);
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res = 0;
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}
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break;
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case CW_GETPINFO:
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res = (uintptr_t) fillout_pinfo (va_arg (arg, DWORD), 0);
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break;
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case CW_GETVERSIONINFO:
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res = (uintptr_t) cygwin_version_strings;
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break;
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case CW_READ_V1_MOUNT_TABLES:
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set_errno (ENOSYS);
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res = 1;
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break;
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case CW_USER_DATA:
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#ifndef __x86_64__
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/* This is a kludge to work around a version of _cygwin_common_crt0
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which overwrote the cxx_malloc field with the local DLL copy.
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Hilarity ensues if the DLL is not loaded like while the process
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is forking. */
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__cygwin_user_data.cxx_malloc = &default_cygwin_cxx_malloc;
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#endif
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res = (uintptr_t) &__cygwin_user_data;
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break;
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case CW_PERFILE:
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perfile_table = va_arg (arg, struct __cygwin_perfile *);
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res = 0;
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break;
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case CW_GET_CYGDRIVE_PREFIXES:
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{
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char *user = va_arg (arg, char *);
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char *system = va_arg (arg, char *);
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res = get_cygdrive_info (user, system, NULL, NULL);
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}
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break;
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case CW_GETPINFO_FULL:
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res = (uintptr_t) fillout_pinfo (va_arg (arg, pid_t), 1);
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break;
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case CW_INIT_EXCEPTIONS:
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/* noop */ /* init_exceptions (va_arg (arg, exception_list *)); */
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res = 0;
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break;
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case CW_GET_CYGDRIVE_INFO:
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{
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char *user = va_arg (arg, char *);
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char *system = va_arg (arg, char *);
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char *user_flags = va_arg (arg, char *);
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char *system_flags = va_arg (arg, char *);
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res = get_cygdrive_info (user, system, user_flags, system_flags);
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}
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break;
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case CW_SET_CYGWIN_REGISTRY_NAME:
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case CW_GET_CYGWIN_REGISTRY_NAME:
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res = 0;
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break;
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case CW_STRACE_TOGGLE:
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{
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pid_t pid = va_arg (arg, pid_t);
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pinfo p (pid);
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if (p)
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{
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sig_send (p, __SIGSTRACE);
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res = 0;
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}
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else
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{
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set_errno (ESRCH);
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res = (uintptr_t) -1;
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}
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}
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break;
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case CW_STRACE_ACTIVE:
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{
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res = strace.active ();
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}
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break;
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case CW_CYGWIN_PID_TO_WINPID:
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{
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pinfo p (va_arg (arg, pid_t));
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res = p ? p->dwProcessId : 0;
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}
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break;
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case CW_EXTRACT_DOMAIN_AND_USER:
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{
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WCHAR nt_domain[MAX_DOMAIN_NAME_LEN + 1];
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WCHAR nt_user[UNLEN + 1];
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struct passwd *pw = va_arg (arg, struct passwd *);
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char *domain = va_arg (arg, char *);
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char *user = va_arg (arg, char *);
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extract_nt_dom_user (pw, nt_domain, nt_user);
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if (domain)
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sys_wcstombs (domain, MAX_DOMAIN_NAME_LEN + 1, nt_domain);
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if (user)
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sys_wcstombs (user, UNLEN + 1, nt_user);
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res = 0;
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}
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break;
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case CW_CMDLINE:
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{
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size_t n;
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pid_t pid = va_arg (arg, pid_t);
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pinfo p (pid);
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res = (uintptr_t) p->cmdline (n);
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}
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break;
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case CW_CHECK_NTSEC:
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{
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char *filename = va_arg (arg, char *);
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res = check_ntsec (filename);
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}
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break;
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case CW_GET_ERRNO_FROM_WINERROR:
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{
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int error = va_arg (arg, int);
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int deferrno = va_arg (arg, int);
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res = geterrno_from_win_error (error, deferrno);
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}
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break;
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case CW_GET_POSIX_SECURITY_ATTRIBUTE:
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{
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path_conv dummy;
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security_descriptor sd;
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int attribute = va_arg (arg, int);
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PSECURITY_ATTRIBUTES psa = va_arg (arg, PSECURITY_ATTRIBUTES);
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void *sd_buf = va_arg (arg, void *);
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DWORD sd_buf_size = va_arg (arg, DWORD);
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set_security_attribute (dummy, attribute, psa, sd);
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if (!psa->lpSecurityDescriptor)
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res = sd.size ();
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else
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{
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psa->lpSecurityDescriptor = sd_buf;
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res = sd.copy (sd_buf, sd_buf_size);
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}
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}
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break;
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case CW_GET_SHMLBA:
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{
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res = wincap.allocation_granularity ();
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}
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break;
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case CW_GET_UID_FROM_SID:
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{
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cygpsid psid = va_arg (arg, PSID);
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res = psid.get_uid (NULL);
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}
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break;
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case CW_GET_GID_FROM_SID:
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{
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cygpsid psid = va_arg (arg, PSID);
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res = psid.get_gid (NULL);
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}
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break;
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case CW_GET_BINMODE:
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{
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const char *path = va_arg (arg, const char *);
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path_conv p (path, PC_SYM_FOLLOW | PC_NULLEMPTY);
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if (p.error)
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{
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set_errno (p.error);
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res = (unsigned long) -1;
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}
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else
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res = p.binmode ();
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}
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break;
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case CW_HOOK:
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{
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const char *name = va_arg (arg, const char *);
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const void *hookfn = va_arg (arg, const void *);
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WORD subsys;
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res = (uintptr_t) hook_or_detect_cygwin (name, hookfn, subsys);
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}
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break;
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case CW_ARGV:
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{
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child_info_spawn *ci = (child_info_spawn *) get_cygwin_startup_info ();
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res = (uintptr_t) (ci ? ci->moreinfo->argv : NULL);
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}
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break;
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case CW_ENVP:
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{
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child_info_spawn *ci = (child_info_spawn *) get_cygwin_startup_info ();
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res = (uintptr_t) (ci ? ci->moreinfo->envp : NULL);
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}
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break;
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case CW_DEBUG_SELF:
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error_start_init (va_arg (arg, const char *));
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res = try_to_debug ();
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break;
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case CW_SYNC_WINENV:
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create_winenv (NULL);
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res = 0;
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break;
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case CW_CYGTLS_PADSIZE:
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res = CYGTLS_PADSIZE;
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break;
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case CW_SET_DOS_FILE_WARNING:
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{
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dos_file_warning = va_arg (arg, int);
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res = 0;
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}
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break;
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case CW_SET_PRIV_KEY:
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{
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const char *passwd = va_arg (arg, const char *);
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const char *username = va_arg (arg, const char *);
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res = setlsapwd (passwd, username);
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}
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break;
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case CW_SETERRNO:
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{
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const char *file = va_arg (arg, const char *);
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int line = va_arg (arg, int);
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seterrno(file, line);
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res = 0;
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}
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break;
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case CW_EXIT_PROCESS:
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{
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UINT status = va_arg (arg, UINT);
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int useTerminateProcess = va_arg (arg, int);
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exit_process (status, !!useTerminateProcess); /* no return */
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}
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case CW_SET_EXTERNAL_TOKEN:
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{
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HANDLE token = va_arg (arg, HANDLE);
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int type = va_arg (arg, int);
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set_imp_token (token, type);
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res = 0;
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}
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break;
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case CW_GET_INSTKEY:
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{
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PWCHAR dest = va_arg (arg, PWCHAR);
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wcscpy (dest, cygheap->installation_key_buf);
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res = 0;
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}
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break;
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case CW_INT_SETLOCALE:
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{
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extern void internal_setlocale ();
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internal_setlocale ();
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res = 0;
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}
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break;
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case CW_CVT_MNT_OPTS:
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{
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extern bool fstab_read_flags (char **, unsigned &, bool);
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char **option_string = va_arg (arg, char **);
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if (!option_string || !*option_string)
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set_errno (EINVAL);
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else
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{
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unsigned *pflags = va_arg (arg, unsigned *);
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unsigned flags = pflags ? *pflags : 0;
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if (fstab_read_flags (option_string, flags, true))
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{
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if (pflags)
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*pflags = flags;
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res = 0;
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}
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}
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}
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break;
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case CW_LST_MNT_OPTS:
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{
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extern char *fstab_list_flags ();
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char **option_string = va_arg (arg, char **);
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if (!option_string)
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set_errno (EINVAL);
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else
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{
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*option_string = fstab_list_flags ();
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if (*option_string)
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res = 0;
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}
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}
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break;
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case CW_STRERROR:
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{
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int err = va_arg (arg, int);
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res = (uintptr_t) strerror (err);
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}
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break;
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case CW_CVT_ENV_TO_WINENV:
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{
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char **posix_env = va_arg (arg, char **);
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res = (uintptr_t) create_winenv (posix_env);
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}
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break;
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case CW_ALLOC_DRIVE_MAP:
|
|
{
|
|
dos_drive_mappings *ddm = new dos_drive_mappings ();
|
|
res = (uintptr_t) ddm;
|
|
}
|
|
break;
|
|
|
|
case CW_MAP_DRIVE_MAP:
|
|
{
|
|
dos_drive_mappings *ddm = va_arg (arg, dos_drive_mappings *);
|
|
wchar_t *pathbuf = va_arg (arg, wchar_t *);
|
|
if (ddm && pathbuf)
|
|
res = (uintptr_t) ddm->fixup_if_match (pathbuf);
|
|
}
|
|
break;
|
|
|
|
case CW_FREE_DRIVE_MAP:
|
|
{
|
|
dos_drive_mappings *ddm = va_arg (arg, dos_drive_mappings *);
|
|
if (ddm)
|
|
delete ddm;
|
|
res = 0;
|
|
}
|
|
break;
|
|
|
|
case CW_SETENT:
|
|
{
|
|
int group = va_arg (arg, int);
|
|
int enums = va_arg (arg, int);
|
|
PCWSTR enum_tdoms = va_arg (arg, PCWSTR);
|
|
if (group)
|
|
res = (uintptr_t) setgrent_filtered (enums, enum_tdoms);
|
|
else
|
|
res = (uintptr_t) setpwent_filtered (enums, enum_tdoms);
|
|
}
|
|
break;
|
|
|
|
case CW_GETENT:
|
|
{
|
|
int group = va_arg (arg, int);
|
|
void *obj = va_arg (arg, void *);
|
|
if (obj)
|
|
{
|
|
if (group)
|
|
res = (uintptr_t) getgrent_filtered (obj);
|
|
else
|
|
res = (uintptr_t) getpwent_filtered (obj);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CW_ENDENT:
|
|
{
|
|
int group = va_arg (arg, int);
|
|
void *obj = va_arg (arg, void *);
|
|
if (obj)
|
|
{
|
|
if (group)
|
|
endgrent_filtered (obj);
|
|
else
|
|
endpwent_filtered (obj);
|
|
res = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case CW_GETNSSSEP:
|
|
res = (uintptr_t) cygheap->pg.nss_separator ();
|
|
break;
|
|
|
|
case CW_GETNSS_PWD_SRC:
|
|
res = (uintptr_t) cygheap->pg.nss_pwd_src ();
|
|
break;
|
|
|
|
case CW_GETNSS_GRP_SRC:
|
|
res = (uintptr_t) cygheap->pg.nss_grp_src ();
|
|
break;
|
|
|
|
case CW_GETPWSID:
|
|
{
|
|
int db_only = va_arg (arg, int);
|
|
PSID psid = va_arg (arg, PSID);
|
|
cygpsid sid (psid);
|
|
res = (uintptr_t) (db_only ? internal_getpwsid_from_db (sid)
|
|
: internal_getpwsid (sid));
|
|
}
|
|
break;
|
|
|
|
case CW_GETGRSID:
|
|
{
|
|
int db_only = va_arg (arg, int);
|
|
PSID psid = va_arg (arg, PSID);
|
|
cygpsid sid (psid);
|
|
res = (uintptr_t) (db_only ? internal_getgrsid_from_db (sid)
|
|
: internal_getgrsid (sid));
|
|
}
|
|
break;
|
|
|
|
case CW_CYGNAME_FROM_WINNAME:
|
|
{
|
|
/* This functionality has been added mainly for sshd. Sshd
|
|
calls getpwnam() with the username of the non-privileged
|
|
user used for privilege separation. This is usually a
|
|
fixed string "sshd". However, when using usernames from
|
|
the Windows DBs, it's no safe bet anymore if the username
|
|
is "sshd", it could also be "DOMAIN+sshd". So what we do
|
|
here is this:
|
|
|
|
Sshd calls cygwin_internal (CW_CYGNAME_FROM_WINNAME,
|
|
"sshd",
|
|
username_buffer,
|
|
sizeof username_buffer);
|
|
|
|
If this call succeeds, sshd expects the correct Cygwin
|
|
username of the unprivileged sshd account in username_buffer.
|
|
|
|
The below code checks for a Windows username matching the
|
|
incoming username, and then fetches the Cygwin username with
|
|
the matching SID. This is our username used for privsep then.
|
|
|
|
Of course, other applications with similar needs can use the
|
|
same method. */
|
|
const char *winname = va_arg (arg, const char *);
|
|
char *buffer = va_arg (arg, char *);
|
|
size_t buflen = va_arg (arg, size_t);
|
|
|
|
if (!winname || !buffer || !buflen)
|
|
break;
|
|
|
|
WCHAR name[UNLEN + 1];
|
|
sys_mbstowcs (name, sizeof name, winname);
|
|
|
|
cygsid sid;
|
|
DWORD slen = SECURITY_MAX_SID_SIZE;
|
|
WCHAR dom[DNLEN + 1];
|
|
DWORD dlen = DNLEN + 1;
|
|
SID_NAME_USE acc_type;
|
|
|
|
if (!LookupAccountNameW (NULL, name, sid, &slen, dom, &dlen,
|
|
&acc_type))
|
|
break;
|
|
|
|
struct passwd *pw = internal_getpwsid (sid);
|
|
if (!pw)
|
|
break;
|
|
|
|
buffer[0] = '\0';
|
|
strncat (buffer, pw->pw_name, buflen - 1);
|
|
res = 0;
|
|
}
|
|
break;
|
|
|
|
case CW_FIXED_ATEXIT:
|
|
res = 0;
|
|
break;
|
|
|
|
case CW_EXCEPTION_RECORD_FROM_SIGINFO_T:
|
|
{
|
|
siginfo_t *si = va_arg(arg, siginfo_t *);
|
|
EXCEPTION_RECORD *er = va_arg(arg, EXCEPTION_RECORD *);
|
|
if (si && si->si_cyg && er)
|
|
{
|
|
memcpy(er, ((cygwin_exception *)si->si_cyg)->exception_record(),
|
|
sizeof(EXCEPTION_RECORD));
|
|
res = 0;
|
|
}
|
|
}
|
|
break;
|
|
|
|
default:
|
|
set_errno (ENOSYS);
|
|
}
|
|
va_end (arg);
|
|
return res;
|
|
}
|