mirror of
git://git.gnupg.org/gnupg.git
synced 2024-09-06 12:46:22 +02:00
681 lines
16 KiB
C
681 lines
16 KiB
C
/* sysutils.c - system helpers
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* Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004,
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* 2007, 2008 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#ifdef WITHOUT_NPTH /* Give the Makefile a chance to build without Pth. */
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# undef HAVE_NPTH
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# undef USE_NPTH
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_STAT
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# include <sys/stat.h>
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#endif
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#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
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# include <asm/sysinfo.h>
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# include <asm/unistd.h>
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#endif
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#ifdef HAVE_SETRLIMIT
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# include <time.h>
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# include <sys/time.h>
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# include <sys/resource.h>
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#endif
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#ifdef HAVE_W32_SYSTEM
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# define WINVER 0x0500 /* Required for AllowSetForegroundWindow. */
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# include <windows.h>
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#endif
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#ifdef HAVE_NPTH
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# include <npth.h>
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#endif
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#include <fcntl.h>
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#include <assuan.h>
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#include "setenv.h" /* Gnulib replacement. */
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#include "util.h"
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#include "i18n.h"
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#include "sysutils.h"
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#define tohex(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'A'))
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#if defined(__linux__) && defined(__alpha__) && __GLIBC__ < 2
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#warning using trap_unaligned
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static int
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setsysinfo(unsigned long op, void *buffer, unsigned long size,
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int *start, void *arg, unsigned long flag)
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{
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return syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
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}
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void
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trap_unaligned(void)
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{
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unsigned int buf[2];
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buf[0] = SSIN_UACPROC;
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buf[1] = UAC_SIGBUS | UAC_NOPRINT;
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setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
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}
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#else
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void
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trap_unaligned(void)
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{ /* dummy */
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}
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#endif
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int
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disable_core_dumps (void)
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{
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#ifdef HAVE_DOSISH_SYSTEM
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return 0;
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#else
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# ifdef HAVE_SETRLIMIT
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struct rlimit limit;
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/* We only set the current limit unless we were not able to
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retrieve the old value. */
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if (getrlimit (RLIMIT_CORE, &limit))
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limit.rlim_max = 0;
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limit.rlim_cur = 0;
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if( !setrlimit (RLIMIT_CORE, &limit) )
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return 0;
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if( errno != EINVAL && errno != ENOSYS )
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log_fatal (_("can't disable core dumps: %s\n"), strerror(errno) );
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#endif
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return 1;
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#endif
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}
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int
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enable_core_dumps (void)
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{
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#ifdef HAVE_DOSISH_SYSTEM
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return 0;
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#else
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# ifdef HAVE_SETRLIMIT
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struct rlimit limit;
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if (getrlimit (RLIMIT_CORE, &limit))
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return 1;
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limit.rlim_cur = limit.rlim_max;
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setrlimit (RLIMIT_CORE, &limit);
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return 1; /* We always return true because this function is
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merely a debugging aid. */
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# endif
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return 1;
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#endif
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}
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/* Return a string which is used as a kind of process ID. */
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const byte *
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get_session_marker (size_t *rlen)
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{
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static byte marker[SIZEOF_UNSIGNED_LONG*2];
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static int initialized;
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if (!initialized)
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{
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gcry_create_nonce (marker, sizeof marker);
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initialized = 1;
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}
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*rlen = sizeof (marker);
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return marker;
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}
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/* Return a random number in an unsigned int. */
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unsigned int
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get_uint_nonce (void)
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{
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unsigned int value;
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gcry_create_nonce (&value, sizeof value);
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return value;
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}
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#if 0 /* not yet needed - Note that this will require inclusion of
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cmacros.am in Makefile.am */
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int
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check_permissions(const char *path,int extension,int checkonly)
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{
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#if defined(HAVE_STAT) && !defined(HAVE_DOSISH_SYSTEM)
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char *tmppath;
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struct stat statbuf;
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int ret=1;
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int isdir=0;
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if(opt.no_perm_warn)
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return 0;
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if(extension && path[0]!=DIRSEP_C)
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{
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if(strchr(path,DIRSEP_C))
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tmppath=make_filename(path,NULL);
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else
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tmppath=make_filename(GNUPG_LIBDIR,path,NULL);
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}
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else
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tmppath=m_strdup(path);
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/* It's okay if the file doesn't exist */
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if(stat(tmppath,&statbuf)!=0)
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{
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ret=0;
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goto end;
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}
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isdir=S_ISDIR(statbuf.st_mode);
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/* Per-user files must be owned by the user. Extensions must be
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owned by the user or root. */
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if((!extension && statbuf.st_uid != getuid()) ||
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(extension && statbuf.st_uid!=0 && statbuf.st_uid!=getuid()))
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{
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if(!checkonly)
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log_info(_("Warning: unsafe ownership on %s \"%s\"\n"),
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isdir?"directory":extension?"extension":"file",path);
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goto end;
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}
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/* This works for both directories and files - basically, we don't
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care what the owner permissions are, so long as the group and
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other permissions are 0 for per-user files, and non-writable for
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extensions. */
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if((extension && (statbuf.st_mode & (S_IWGRP|S_IWOTH)) !=0) ||
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(!extension && (statbuf.st_mode & (S_IRWXG|S_IRWXO)) != 0))
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{
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char *dir;
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/* However, if the directory the directory/file is in is owned
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by the user and is 700, then this is not a problem.
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Theoretically, we could walk this test up to the root
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directory /, but for the sake of sanity, I'm stopping at one
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level down. */
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dir= make_dirname (tmppath);
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if(stat(dir,&statbuf)==0 && statbuf.st_uid==getuid() &&
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S_ISDIR(statbuf.st_mode) && (statbuf.st_mode & (S_IRWXG|S_IRWXO))==0)
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{
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xfree (dir);
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ret=0;
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goto end;
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}
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m_free(dir);
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if(!checkonly)
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log_info(_("Warning: unsafe permissions on %s \"%s\"\n"),
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isdir?"directory":extension?"extension":"file",path);
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goto end;
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}
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ret=0;
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end:
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m_free(tmppath);
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return ret;
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#endif /* HAVE_STAT && !HAVE_DOSISH_SYSTEM */
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return 0;
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}
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#endif
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/* Wrapper around the usual sleep fucntion. This one won't wake up
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before the sleep time has really elapsed. When build with Pth it
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merely calls pth_sleep and thus suspends only the current
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thread. */
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void
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gnupg_sleep (unsigned int seconds)
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{
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#ifdef HAVE_NPTH
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/* With Pth we force a regular sleep for seconds == 0 so that also
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the process will give up its timeslot. */
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if (!seconds)
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{
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# ifdef HAVE_W32_SYSTEM
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Sleep (0);
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# else
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sleep (0);
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# endif
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}
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pth_sleep (seconds);
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#else
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/* Fixme: make sure that a sleep won't wake up to early. */
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# ifdef HAVE_W32_SYSTEM
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Sleep (seconds*1000);
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# else
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sleep (seconds);
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# endif
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#endif
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}
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/* This function is a NOP for POSIX systems but required under Windows
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as the file handles as returned by OS calls (like CreateFile) are
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different from the libc file descriptors (like open). This function
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translates system file handles to libc file handles. FOR_WRITE
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gives the direction of the handle. */
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int
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translate_sys2libc_fd (gnupg_fd_t fd, int for_write)
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{
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#if defined(HAVE_W32CE_SYSTEM)
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(void)for_write;
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return (int) fd;
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#elif defined(HAVE_W32_SYSTEM)
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int x;
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if (fd == GNUPG_INVALID_FD)
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return -1;
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/* Note that _open_osfhandle is currently defined to take and return
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a long. */
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x = _open_osfhandle ((long)fd, for_write ? 1 : 0);
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if (x == -1)
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log_error ("failed to translate osfhandle %p\n", (void *) fd);
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return x;
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#else /*!HAVE_W32_SYSTEM */
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(void)for_write;
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return fd;
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#endif
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}
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/* This is the same as translate_sys2libc_fd but takes an integer
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which is assumed to be such an system handle. On WindowsCE the
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passed FD is a rendezvous ID and the function finishes the pipe
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creation. */
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int
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translate_sys2libc_fd_int (int fd, int for_write)
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{
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#if HAVE_W32CE_SYSTEM
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fd = (int) _assuan_w32ce_finish_pipe (fd, for_write);
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return translate_sys2libc_fd ((void*)fd, for_write);
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#elif HAVE_W32_SYSTEM
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if (fd <= 2)
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return fd; /* Do not do this for error, stdin, stdout, stderr. */
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return translate_sys2libc_fd ((void*)fd, for_write);
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#else
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(void)for_write;
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return fd;
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#endif
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}
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/* Replacement for tmpfile(). This is required because the tmpfile
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function of Windows' runtime library is broken, insecure, ignores
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TMPDIR and so on. In addition we create a file with an inheritable
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handle. */
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FILE *
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gnupg_tmpfile (void)
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{
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#ifdef HAVE_W32_SYSTEM
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int attempts, n;
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#ifdef HAVE_W32CE_SYSTEM
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wchar_t buffer[MAX_PATH+7+12+1];
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# define mystrlen(a) wcslen (a)
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wchar_t *name, *p;
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#else
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char buffer[MAX_PATH+7+12+1];
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# define mystrlen(a) strlen (a)
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char *name, *p;
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#endif
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HANDLE file;
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int pid = GetCurrentProcessId ();
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unsigned int value;
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int i;
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SECURITY_ATTRIBUTES sec_attr;
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memset (&sec_attr, 0, sizeof sec_attr );
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sec_attr.nLength = sizeof sec_attr;
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sec_attr.bInheritHandle = TRUE;
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n = GetTempPath (MAX_PATH+1, buffer);
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if (!n || n > MAX_PATH || mystrlen (buffer) > MAX_PATH)
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{
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gpg_err_set_errno (ENOENT);
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return NULL;
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}
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p = buffer + mystrlen (buffer);
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#ifdef HAVE_W32CE_SYSTEM
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wcscpy (p, L"_gnupg");
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p += 7;
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#else
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p = stpcpy (p, "_gnupg");
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#endif
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/* We try to create the directory but don't care about an error as
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it may already exist and the CreateFile would throw an error
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anyway. */
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CreateDirectory (buffer, NULL);
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*p++ = '\\';
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name = p;
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for (attempts=0; attempts < 10; attempts++)
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{
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p = name;
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value = (GetTickCount () ^ ((pid<<16) & 0xffff0000));
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for (i=0; i < 8; i++)
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{
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*p++ = tohex (((value >> 28) & 0x0f));
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value <<= 4;
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}
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#ifdef HAVE_W32CE_SYSTEM
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wcscpy (p, L".tmp");
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#else
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strcpy (p, ".tmp");
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#endif
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file = CreateFile (buffer,
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GENERIC_READ | GENERIC_WRITE,
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0,
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&sec_attr,
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CREATE_NEW,
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FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE,
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NULL);
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if (file != INVALID_HANDLE_VALUE)
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{
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FILE *fp;
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#ifdef HAVE_W32CE_SYSTEM
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int fd = (int)file;
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fp = _wfdopen (fd, L"w+b");
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#else
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int fd = _open_osfhandle ((long)file, 0);
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if (fd == -1)
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{
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CloseHandle (file);
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return NULL;
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}
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fp = fdopen (fd, "w+b");
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#endif
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if (!fp)
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{
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int save = errno;
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close (fd);
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gpg_err_set_errno (save);
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return NULL;
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}
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return fp;
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}
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Sleep (1); /* One ms as this is the granularity of GetTickCount. */
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}
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gpg_err_set_errno (ENOENT);
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return NULL;
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#undef mystrlen
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#else /*!HAVE_W32_SYSTEM*/
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return tmpfile ();
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#endif /*!HAVE_W32_SYSTEM*/
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}
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/* Make sure that the standard file descriptors are opened. Obviously
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some folks close them before an exec and the next file we open will
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get one of them assigned and thus any output (i.e. diagnostics) end
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up in that file (e.g. the trustdb). Not actually a gpg problem as
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this will hapen with almost all utilities when called in a wrong
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way. However we try to minimize the damage here and raise
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awareness of the problem.
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Must be called before we open any files! */
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void
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gnupg_reopen_std (const char *pgmname)
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{
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#if defined(HAVE_STAT) && !defined(HAVE_W32_SYSTEM)
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struct stat statbuf;
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int did_stdin = 0;
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int did_stdout = 0;
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int did_stderr = 0;
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FILE *complain;
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if (fstat (STDIN_FILENO, &statbuf) == -1 && errno ==EBADF)
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{
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if (open ("/dev/null",O_RDONLY) == STDIN_FILENO)
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did_stdin = 1;
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else
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did_stdin = 2;
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}
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if (fstat (STDOUT_FILENO, &statbuf) == -1 && errno == EBADF)
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{
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if (open ("/dev/null",O_WRONLY) == STDOUT_FILENO)
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did_stdout = 1;
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else
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did_stdout = 2;
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}
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if (fstat (STDERR_FILENO, &statbuf)==-1 && errno==EBADF)
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{
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if (open ("/dev/null", O_WRONLY) == STDERR_FILENO)
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did_stderr = 1;
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else
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did_stderr = 2;
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}
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/* It's hard to log this sort of thing since the filehandle we would
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complain to may be closed... */
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if (!did_stderr)
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complain = stderr;
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else if (!did_stdout)
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complain = stdout;
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else
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complain = NULL;
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if (complain)
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{
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if (did_stdin == 1)
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fprintf (complain, "%s: WARNING: standard input reopened\n", pgmname);
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if (did_stdout == 1)
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fprintf (complain, "%s: WARNING: standard output reopened\n", pgmname);
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if (did_stderr == 1)
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fprintf (complain, "%s: WARNING: standard error reopened\n", pgmname);
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if (did_stdin == 2 || did_stdout == 2 || did_stderr == 2)
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fprintf(complain,"%s: fatal: unable to reopen standard input,"
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" output, or error\n", pgmname);
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}
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if (did_stdin == 2 || did_stdout == 2 || did_stderr == 2)
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exit (3);
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#else /* !(HAVE_STAT && !HAVE_W32_SYSTEM) */
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(void)pgmname;
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#endif
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}
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/* Hack required for Windows. */
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void
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gnupg_allow_set_foregound_window (pid_t pid)
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{
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if (!pid)
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log_info ("%s called with invalid pid %lu\n",
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"gnupg_allow_set_foregound_window", (unsigned long)pid);
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#if defined(HAVE_W32_SYSTEM) && !defined(HAVE_W32CE_SYSTEM)
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else if (!AllowSetForegroundWindow ((pid_t)pid == (pid_t)(-1)?ASFW_ANY:pid))
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log_info ("AllowSetForegroundWindow(%lu) failed: %s\n",
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(unsigned long)pid, w32_strerror (-1));
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#endif
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}
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int
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gnupg_remove (const char *fname)
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{
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#ifdef HAVE_W32CE_SYSTEM
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int rc;
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wchar_t *wfname;
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wfname = utf8_to_wchar (fname);
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if (!wfname)
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rc = 0;
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else
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{
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rc = DeleteFile (wfname);
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xfree (wfname);
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}
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if (!rc)
|
|
return -1; /* ERRNO is automagically provided by gpg-error.h. */
|
|
return 0;
|
|
#else
|
|
return remove (fname);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* A wrapper around mkdir which takes a string for the mode argument.
|
|
This makes it easier to handle the mode argument which is not
|
|
defined on all systems. The format of the modestring is
|
|
|
|
"-rwxrwxrwx"
|
|
|
|
'-' is a don't care or not set. 'r', 'w', 'x' are read allowed,
|
|
write allowed, execution allowed with the first group for the user,
|
|
the second for the group and the third for all others. If the
|
|
string is shorter than above the missing mode characters are meant
|
|
to be not set. */
|
|
int
|
|
gnupg_mkdir (const char *name, const char *modestr)
|
|
{
|
|
#ifdef HAVE_W32CE_SYSTEM
|
|
wchar_t *wname;
|
|
(void)modestr;
|
|
|
|
wname = utf8_to_wchar (name);
|
|
if (!wname)
|
|
return -1;
|
|
if (!CreateDirectoryW (wname, NULL))
|
|
{
|
|
xfree (wname);
|
|
return -1; /* ERRNO is automagically provided by gpg-error.h. */
|
|
}
|
|
xfree (wname);
|
|
return 0;
|
|
#elif MKDIR_TAKES_ONE_ARG
|
|
(void)modestr;
|
|
/* Note: In the case of W32 we better use CreateDirectory and try to
|
|
set appropriate permissions. However using mkdir is easier
|
|
because this sets ERRNO. */
|
|
return mkdir (name);
|
|
#else
|
|
mode_t mode = 0;
|
|
|
|
if (modestr && *modestr)
|
|
{
|
|
modestr++;
|
|
if (*modestr && *modestr++ == 'r')
|
|
mode |= S_IRUSR;
|
|
if (*modestr && *modestr++ == 'w')
|
|
mode |= S_IWUSR;
|
|
if (*modestr && *modestr++ == 'x')
|
|
mode |= S_IXUSR;
|
|
if (*modestr && *modestr++ == 'r')
|
|
mode |= S_IRGRP;
|
|
if (*modestr && *modestr++ == 'w')
|
|
mode |= S_IWGRP;
|
|
if (*modestr && *modestr++ == 'x')
|
|
mode |= S_IXGRP;
|
|
if (*modestr && *modestr++ == 'r')
|
|
mode |= S_IROTH;
|
|
if (*modestr && *modestr++ == 'w')
|
|
mode |= S_IWOTH;
|
|
if (*modestr && *modestr++ == 'x')
|
|
mode |= S_IXOTH;
|
|
}
|
|
return mkdir (name, mode);
|
|
#endif
|
|
}
|
|
|
|
|
|
int
|
|
gnupg_setenv (const char *name, const char *value, int overwrite)
|
|
{
|
|
#ifdef HAVE_W32CE_SYSTEM
|
|
(void)name;
|
|
(void)value;
|
|
(void)overwrite;
|
|
return 0;
|
|
#else
|
|
return setenv (name, value, overwrite);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
gnupg_unsetenv (const char *name)
|
|
{
|
|
#ifdef HAVE_W32CE_SYSTEM
|
|
(void)name;
|
|
return 0;
|
|
#else
|
|
# ifdef HAVE_UNSETENV
|
|
return unsetenv (name);
|
|
# else
|
|
return putenv (name);
|
|
# endif
|
|
#endif
|
|
}
|
|
|
|
#ifdef HAVE_W32CE_SYSTEM
|
|
/* There is a isatty function declaration in cegcc but it does not
|
|
make sense, thus we redefine it. */
|
|
int
|
|
_gnupg_isatty (int fd)
|
|
{
|
|
(void)fd;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef HAVE_W32CE_SYSTEM
|
|
/* Replacement for getenv which takes care of the our use of getenv.
|
|
The code is not thread safe but we expect it to work in all cases
|
|
because it is called for the first time early enough. */
|
|
char *
|
|
_gnupg_getenv (const char *name)
|
|
{
|
|
static int initialized;
|
|
static char *assuan_debug;
|
|
|
|
if (!initialized)
|
|
{
|
|
assuan_debug = read_w32_registry_string (NULL,
|
|
"\\Software\\GNU\\libassuan",
|
|
"debug");
|
|
initialized = 1;
|
|
}
|
|
|
|
if (!strcmp (name, "ASSUAN_DEBUG"))
|
|
return assuan_debug;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
#endif /*HAVE_W32CE_SYSTEM*/
|