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![Werner Koch](/assets/img/avatar_default.png)
The asymmetric quotes used by GNU in the past (`...') don't render nicely on modern systems. We now use two \x27 characters ('...'). The proper solution would be to use the correct Unicode symmetric quotes here. However this has the disadvantage that the system requires Unicode support. We don't want that today. If Unicode is available a generated po file can be used to output proper quotes. A simple sed script like the one used for en@quote is sufficient to change them. The changes have been done by applying sed -i "s/\`\([^'\`]*\)'/'\1'/g" to most files and fixing obvious problems by hand. The msgid strings in the po files were fixed with a similar command.
618 lines
14 KiB
C
618 lines
14 KiB
C
/* exechelp.c - Fork and exec helpers for POSIX
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* Copyright (C) 2004, 2007, 2008, 2009,
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* 2010 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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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file 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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#if defined(HAVE_W32_SYSTEM) || defined (HAVE_W32CE_SYSTEM)
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#error This code is only used on POSIX
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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 <errno.h>
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#include <assert.h>
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#ifdef HAVE_SIGNAL_H
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# include <signal.h>
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#endif
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#include <unistd.h>
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#include <fcntl.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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#ifdef USE_NPTH
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#include <npth.h>
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#endif
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#include <sys/wait.h>
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#ifdef HAVE_GETRLIMIT
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#include <sys/time.h>
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#include <sys/resource.h>
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#endif /*HAVE_GETRLIMIT*/
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#ifdef HAVE_STAT
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# include <sys/stat.h>
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#endif
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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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#include "exechelp.h"
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/* We have the usual problem here: Some modules are linked against pth
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and some are not. However we want to use pth_fork and pth_waitpid
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here. Using a weak symbol works but is not portable - we should
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provide a an explicit dummy pth module instead of using the
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pragma. */
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#pragma weak pth_fork
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#pragma weak pth_waitpid
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/* Return the maximum number of currently allowed open file
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descriptors. Only useful on POSIX systems but returns a value on
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other systems too. */
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int
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get_max_fds (void)
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{
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int max_fds = -1;
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#ifdef HAVE_GETRLIMIT
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struct rlimit rl;
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# ifdef RLIMIT_NOFILE
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if (!getrlimit (RLIMIT_NOFILE, &rl))
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max_fds = rl.rlim_max;
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# endif
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# ifdef RLIMIT_OFILE
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if (max_fds == -1 && !getrlimit (RLIMIT_OFILE, &rl))
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max_fds = rl.rlim_max;
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# endif
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#endif /*HAVE_GETRLIMIT*/
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#ifdef _SC_OPEN_MAX
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if (max_fds == -1)
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{
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long int scres = sysconf (_SC_OPEN_MAX);
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if (scres >= 0)
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max_fds = scres;
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}
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#endif
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#ifdef _POSIX_OPEN_MAX
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if (max_fds == -1)
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max_fds = _POSIX_OPEN_MAX;
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#endif
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#ifdef OPEN_MAX
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if (max_fds == -1)
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max_fds = OPEN_MAX;
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#endif
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if (max_fds == -1)
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max_fds = 256; /* Arbitrary limit. */
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return max_fds;
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}
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/* Close all file descriptors starting with descriptor FIRST. If
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EXCEPT is not NULL, it is expected to be a list of file descriptors
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which shall not be closed. This list shall be sorted in ascending
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order with the end marked by -1. */
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void
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close_all_fds (int first, int *except)
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{
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int max_fd = get_max_fds ();
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int fd, i, except_start;
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if (except)
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{
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except_start = 0;
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for (fd=first; fd < max_fd; fd++)
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{
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for (i=except_start; except[i] != -1; i++)
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{
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if (except[i] == fd)
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{
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/* If we found the descriptor in the exception list
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we can start the next compare run at the next
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index because the exception list is ordered. */
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except_start = i + 1;
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break;
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}
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}
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if (except[i] == -1)
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close (fd);
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}
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}
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else
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{
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for (fd=first; fd < max_fd; fd++)
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close (fd);
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}
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gpg_err_set_errno (0);
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}
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/* Returns an array with all currently open file descriptors. The end
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of the array is marked by -1. The caller needs to release this
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array using the *standard free* and not with xfree. This allow the
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use of this fucntion right at startup even before libgcrypt has
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been initialized. Returns NULL on error and sets ERRNO
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accordingly. */
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int *
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get_all_open_fds (void)
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{
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int *array;
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size_t narray;
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int fd, max_fd, idx;
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#ifndef HAVE_STAT
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array = calloc (1, sizeof *array);
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if (array)
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array[0] = -1;
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#else /*HAVE_STAT*/
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struct stat statbuf;
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max_fd = get_max_fds ();
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narray = 32; /* If you change this change also t-exechelp.c. */
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array = calloc (narray, sizeof *array);
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if (!array)
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return NULL;
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/* Note: The list we return is ordered. */
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for (idx=0, fd=0; fd < max_fd; fd++)
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if (!(fstat (fd, &statbuf) == -1 && errno == EBADF))
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{
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if (idx+1 >= narray)
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{
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int *tmp;
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narray += (narray < 256)? 32:256;
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tmp = realloc (array, narray * sizeof *array);
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if (!tmp)
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{
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free (array);
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return NULL;
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}
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array = tmp;
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}
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array[idx++] = fd;
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}
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array[idx] = -1;
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#endif /*HAVE_STAT*/
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return array;
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}
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/* The exec core used right after the fork. This will never return. */
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static void
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do_exec (const char *pgmname, const char *argv[],
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int fd_in, int fd_out, int fd_err,
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void (*preexec)(void) )
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{
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char **arg_list;
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int i, j;
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int fds[3];
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fds[0] = fd_in;
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fds[1] = fd_out;
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fds[2] = fd_err;
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/* Create the command line argument array. */
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i = 0;
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if (argv)
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while (argv[i])
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i++;
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arg_list = xcalloc (i+2, sizeof *arg_list);
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arg_list[0] = strrchr (pgmname, '/');
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if (arg_list[0])
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arg_list[0]++;
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else
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arg_list[0] = xstrdup (pgmname);
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if (argv)
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for (i=0,j=1; argv[i]; i++, j++)
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arg_list[j] = (char*)argv[i];
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/* Assign /dev/null to unused FDs. */
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for (i=0; i <= 2; i++)
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{
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if (fds[i] == -1 )
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{
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fds[i] = open ("/dev/null", i? O_WRONLY : O_RDONLY);
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if (fds[i] == -1)
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log_fatal ("failed to open '%s': %s\n",
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"/dev/null", strerror (errno));
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}
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}
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/* Connect the standard files. */
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for (i=0; i <= 2; i++)
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{
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if (fds[i] != i && dup2 (fds[i], i) == -1)
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log_fatal ("dup2 std%s failed: %s\n",
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i==0?"in":i==1?"out":"err", strerror (errno));
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}
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/* Close all other files. */
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close_all_fds (3, NULL);
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if (preexec)
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preexec ();
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execv (pgmname, arg_list);
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/* No way to print anything, as we have closed all streams. */
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_exit (127);
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}
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static gpg_error_t
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do_create_pipe (int filedes[2])
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{
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gpg_error_t err = 0;
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if (pipe (filedes) == -1)
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{
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err = gpg_error_from_syserror ();
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filedes[0] = filedes[1] = -1;
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}
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return err;
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}
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/* Portable function to create a pipe. Under Windows the write end is
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inheritable. */
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gpg_error_t
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gnupg_create_inbound_pipe (int filedes[2])
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{
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return do_create_pipe (filedes);
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}
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/* Portable function to create a pipe. Under Windows the read end is
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inheritable. */
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gpg_error_t
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gnupg_create_outbound_pipe (int filedes[2])
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{
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return do_create_pipe (filedes);
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}
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static gpg_error_t
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create_pipe_and_estream (int filedes[2], estream_t *r_fp,
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gpg_err_source_t errsource)
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{
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gpg_error_t err;
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if (pipe (filedes) == -1)
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{
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err = gpg_err_make (errsource, gpg_err_code_from_syserror ());
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log_error (_("error creating a pipe: %s\n"), gpg_strerror (err));
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filedes[0] = filedes[1] = -1;
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*r_fp = NULL;
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return err;
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}
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*r_fp = es_fdopen (filedes[0], "r");
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if (!*r_fp)
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{
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err = gpg_err_make (errsource, gpg_err_code_from_syserror ());
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log_error (_("error creating a stream for a pipe: %s\n"),
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gpg_strerror (err));
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close (filedes[0]);
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close (filedes[1]);
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filedes[0] = filedes[1] = -1;
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return err;
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}
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return 0;
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}
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/* Fork and exec the PGMNAME, see exechelp.h for details. */
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gpg_error_t
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gnupg_spawn_process (const char *pgmname, const char *argv[],
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gpg_err_source_t errsource,
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void (*preexec)(void), unsigned int flags,
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estream_t infp,
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estream_t *r_outfp,
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estream_t *r_errfp,
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pid_t *pid)
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{
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gpg_error_t err;
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int infd = -1;
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int outpipe[2] = {-1, -1};
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int errpipe[2] = {-1, -1};
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estream_t outfp = NULL;
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estream_t errfp = NULL;
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(void)flags; /* Currently not used. */
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if (r_outfp)
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*r_outfp = NULL;
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if (r_errfp)
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*r_errfp = NULL;
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*pid = (pid_t)(-1); /* Always required. */
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if (infp)
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{
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es_fflush (infp);
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es_rewind (infp);
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infd = es_fileno (infp);
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if (infd == -1)
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return gpg_err_make (errsource, GPG_ERR_INV_VALUE);
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}
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if (r_outfp)
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{
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err = create_pipe_and_estream (outpipe, &outfp, errsource);
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if (err)
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return err;
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}
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if (r_errfp)
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{
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err = create_pipe_and_estream (errpipe, &errfp, errsource);
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if (err)
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{
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if (outfp)
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es_fclose (outfp);
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else if (outpipe[0] != -1)
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close (outpipe[0]);
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if (outpipe[1] != -1)
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close (outpipe[1]);
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return err;
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}
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}
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*pid = fork ();
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if (*pid == (pid_t)(-1))
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{
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err = gpg_err_make (errsource, gpg_err_code_from_syserror ());
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log_error (_("error forking process: %s\n"), gpg_strerror (err));
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if (outfp)
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es_fclose (outfp);
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else if (outpipe[0] != -1)
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close (outpipe[0]);
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if (outpipe[1] != -1)
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close (outpipe[1]);
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if (errfp)
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es_fclose (errfp);
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else if (errpipe[0] != -1)
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close (errpipe[0]);
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if (errpipe[1] != -1)
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close (errpipe[1]);
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return err;
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}
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if (!*pid)
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{
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/* This is the child. */
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gcry_control (GCRYCTL_TERM_SECMEM);
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es_fclose (outfp);
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es_fclose (errfp);
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do_exec (pgmname, argv, infd, outpipe[1], errpipe[1], preexec);
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/*NOTREACHED*/
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}
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/* This is the parent. */
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if (outpipe[1] != -1)
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close (outpipe[1]);
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if (errpipe[1] != -1)
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close (errpipe[1]);
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if (r_outfp)
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*r_outfp = outfp;
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if (r_errfp)
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*r_errfp = errfp;
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return 0;
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}
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/* Simplified version of gnupg_spawn_process. This function forks and
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then execs PGMNAME, while connecting INFD to stdin, OUTFD to stdout
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and ERRFD to stderr (any of them may be -1 to connect them to
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/dev/null). The arguments for the process are expected in the NULL
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terminated array ARGV. The program name itself should not be
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included there. Calling gnupg_wait_process is required.
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Returns 0 on success or an error code. */
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gpg_error_t
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gnupg_spawn_process_fd (const char *pgmname, const char *argv[],
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int infd, int outfd, int errfd, pid_t *pid)
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{
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gpg_error_t err;
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*pid = fork ();
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if (*pid == (pid_t)(-1))
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{
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err = gpg_error_from_syserror ();
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log_error (_("error forking process: %s\n"), strerror (errno));
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return err;
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}
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if (!*pid)
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{
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gcry_control (GCRYCTL_TERM_SECMEM);
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/* Run child. */
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do_exec (pgmname, argv, infd, outfd, errfd, NULL);
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/*NOTREACHED*/
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}
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return 0;
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}
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/* See exechelp.h for the description. */
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gpg_error_t
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gnupg_wait_process (const char *pgmname, pid_t pid, int hang, int *r_exitcode)
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{
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gpg_err_code_t ec;
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int i, status;
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if (r_exitcode)
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*r_exitcode = -1;
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if (pid == (pid_t)(-1))
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return gpg_error (GPG_ERR_INV_VALUE);
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#ifdef USE_NPTH
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i = npth_waitpid (pid, &status, hang? 0:WNOHANG);
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#else
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while ((i=waitpid (pid, &status, hang? 0:WNOHANG)) == (pid_t)(-1)
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&& errno == EINTR);
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#endif
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if (i == (pid_t)(-1))
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{
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ec = gpg_err_code_from_errno (errno);
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log_error (_("waiting for process %d to terminate failed: %s\n"),
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(int)pid, strerror (errno));
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}
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else if (!i)
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{
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ec = GPG_ERR_TIMEOUT; /* Still running. */
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}
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else if (WIFEXITED (status) && WEXITSTATUS (status) == 127)
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{
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log_error (_("error running '%s': probably not installed\n"), pgmname);
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ec = GPG_ERR_CONFIGURATION;
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}
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else if (WIFEXITED (status) && WEXITSTATUS (status))
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{
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if (!r_exitcode)
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log_error (_("error running '%s': exit status %d\n"), pgmname,
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WEXITSTATUS (status));
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else
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*r_exitcode = WEXITSTATUS (status);
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ec = GPG_ERR_GENERAL;
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}
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else if (!WIFEXITED (status))
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{
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log_error (_("error running '%s': terminated\n"), pgmname);
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ec = GPG_ERR_GENERAL;
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}
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else
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{
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if (r_exitcode)
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*r_exitcode = 0;
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ec = 0;
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|
}
|
|
|
|
return gpg_err_make (GPG_ERR_SOURCE_DEFAULT, ec);
|
|
}
|
|
|
|
|
|
void
|
|
gnupg_release_process (pid_t pid)
|
|
{
|
|
(void)pid;
|
|
}
|
|
|
|
|
|
/* Spawn a new process and immediately detach from it. The name of
|
|
the program to exec is PGMNAME and its arguments are in ARGV (the
|
|
programname is automatically passed as first argument).
|
|
Environment strings in ENVP are set. An error is returned if
|
|
pgmname is not executable; to make this work it is necessary to
|
|
provide an absolute file name. All standard file descriptors are
|
|
connected to /dev/null. */
|
|
gpg_error_t
|
|
gnupg_spawn_process_detached (const char *pgmname, const char *argv[],
|
|
const char *envp[] )
|
|
{
|
|
pid_t pid;
|
|
int i;
|
|
|
|
if (getuid() != geteuid())
|
|
return gpg_error (GPG_ERR_BUG);
|
|
|
|
if (access (pgmname, X_OK))
|
|
return gpg_error_from_syserror ();
|
|
|
|
pid = fork ();
|
|
if (pid == (pid_t)(-1))
|
|
{
|
|
log_error (_("error forking process: %s\n"), strerror (errno));
|
|
return gpg_error_from_syserror ();
|
|
}
|
|
if (!pid)
|
|
{
|
|
pid_t pid2;
|
|
|
|
gcry_control (GCRYCTL_TERM_SECMEM);
|
|
if (setsid() == -1 || chdir ("/"))
|
|
_exit (1);
|
|
|
|
pid2 = fork (); /* Double fork to let init take over the new child. */
|
|
if (pid2 == (pid_t)(-1))
|
|
_exit (1);
|
|
if (pid2)
|
|
_exit (0); /* Let the parent exit immediately. */
|
|
|
|
if (envp)
|
|
for (i=0; envp[i]; i++)
|
|
putenv (xstrdup (envp[i]));
|
|
|
|
do_exec (pgmname, argv, -1, -1, -1, NULL);
|
|
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
if (waitpid (pid, NULL, 0) == -1)
|
|
log_error ("waitpid failed in gnupg_spawn_process_detached: %s",
|
|
strerror (errno));
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Kill a process; that is send an appropriate signal to the process.
|
|
gnupg_wait_process must be called to actually remove the process
|
|
from the system. An invalid PID is ignored. */
|
|
void
|
|
gnupg_kill_process (pid_t pid)
|
|
{
|
|
if (pid != (pid_t)(-1))
|
|
{
|
|
kill (pid, SIGTERM);
|
|
}
|
|
}
|