4a55249ee6
* engine-gpgsm.c (close_notify_handler): New function. (_gpgme_gpgsm_new): Manage the file descriptors a bit differently. Do not set close-on-exec flags. (_gpgme_gpgsm_op_decrypt): Do not set message_fd to -1, this is done by the close handler. (_gpgme_gpgsm_op_encrypt): Likewise. (_gpgme_gpgsm_op_import): Likewise (also for output_fd). (_gpgme_gpgsm_op_keylist): Likewise (also for input_fd and output_fd). (_gpgme_gpgsm_op_sign): Likewise. (_gpgme_gpgsm_op_verify): Likewise, but for output_fd. * posix-io.c (_gpgme_io_pipe): Set the close-on-exec flag for the non-inherited file descriptor index of the pipe.
357 lines
9.3 KiB
C
357 lines
9.3 KiB
C
/* posix-io.c - Posix I/O functions
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* Copyright (C) 2000 Werner Koch (dd9jn)
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* Copyright (C) 2001 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME 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 2 of the License, or
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* (at your option) any later version.
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*
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* GPGME 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#ifndef HAVE_DOSISH_SYSTEM
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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 <assert.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <fcntl.h>
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#include "syshdr.h"
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#include "util.h"
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#include "io.h"
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static struct {
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void (*handler)(int,void*);
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void *value;
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} notify_table[256];
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int
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_gpgme_io_read ( int fd, void *buffer, size_t count )
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{
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int nread;
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DEBUG2 ("fd %d: about to read %d bytes\n", fd, (int)count );
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do {
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nread = read (fd, buffer, count);
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} while (nread == -1 && errno == EINTR );
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DEBUG2 ("fd %d: got %d bytes\n", fd, nread );
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if ( nread > 0 ) {
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_gpgme_debug (2, "fd %d: got `%.*s'\n", fd, nread, buffer );
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}
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return nread;
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}
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int
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_gpgme_io_write ( int fd, const void *buffer, size_t count )
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{
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int nwritten;
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DEBUG2 ("fd %d: about to write %d bytes\n", fd, (int)count );
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_gpgme_debug (2, "fd %d: write `%.*s'\n", fd, (int)count, buffer );
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do {
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nwritten = write (fd, buffer, count);
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} while (nwritten == -1 && errno == EINTR );
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DEBUG2 ("fd %d: wrote %d bytes\n", fd, (int)nwritten );
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return nwritten;
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}
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int
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_gpgme_io_pipe (int filedes[2], int inherit_idx)
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{
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int err;
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err = pipe (filedes);
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if (err < 0)
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return err;
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/* FIXME: Should get the old flags first. */
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err = fcntl (filedes[1 - inherit_idx], F_SETFD, FD_CLOEXEC);
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if (err < 0)
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{
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close (filedes[0]);
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close (filedes[1]);
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}
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return err;
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}
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int
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_gpgme_io_close ( int fd )
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{
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if ( fd == -1 )
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return -1;
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/* first call the notify handler */
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DEBUG1 ("closing fd %d", fd );
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if ( fd >= 0 && fd < DIM (notify_table) ) {
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if (notify_table[fd].handler) {
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notify_table[fd].handler (fd, notify_table[fd].value);
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notify_table[fd].handler = NULL;
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notify_table[fd].value = NULL;
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}
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}
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/* then do the close */
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return close (fd);
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}
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int
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_gpgme_io_set_close_notify (int fd, void (*handler)(int, void*), void *value)
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{
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assert (fd != -1);
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if ( fd < 0 || fd >= DIM (notify_table) )
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return -1;
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DEBUG1 ("set notification for fd %d", fd );
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notify_table[fd].handler = handler;
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notify_table[fd].value = value;
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return 0;
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}
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int
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_gpgme_io_set_nonblocking ( int fd )
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{
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int flags;
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flags = fcntl (fd, F_GETFL, 0);
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if (flags == -1)
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return -1;
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flags |= O_NONBLOCK;
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return fcntl (fd, F_SETFL, flags);
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}
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int
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_gpgme_io_spawn ( const char *path, char **argv,
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struct spawn_fd_item_s *fd_child_list,
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struct spawn_fd_item_s *fd_parent_list )
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{
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static volatile int fixed_signals;
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pid_t pid;
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int i;
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if ( !fixed_signals ) {
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struct sigaction act;
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sigaction( SIGPIPE, NULL, &act );
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if( act.sa_handler == SIG_DFL ) {
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act.sa_handler = SIG_IGN;
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sigemptyset( &act.sa_mask );
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act.sa_flags = 0;
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sigaction( SIGPIPE, &act, NULL);
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}
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fixed_signals = 1;
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/* fixme: This is not really MT safe */
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}
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pid = fork ();
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if (pid == -1)
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return -1;
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if ( !pid ) { /* child */
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int duped_stdin = 0;
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int duped_stderr = 0;
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/* first close all fds which will not be duped */
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for (i=0; fd_child_list[i].fd != -1; i++ ) {
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if (fd_child_list[i].dup_to == -1 )
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close (fd_child_list[i].fd);
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}
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/* and now dup and close the rest */
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for (i=0; fd_child_list[i].fd != -1; i++ ) {
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if (fd_child_list[i].dup_to != -1 ) {
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if ( dup2 (fd_child_list[i].fd,
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fd_child_list[i].dup_to ) == -1 ) {
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DEBUG1 ("dup2 failed in child: %s\n", strerror (errno));
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_exit (8);
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}
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if ( fd_child_list[i].dup_to == 0 )
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duped_stdin=1;
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if ( fd_child_list[i].dup_to == 2 )
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duped_stderr=1;
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close (fd_child_list[i].fd);
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}
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}
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if( !duped_stdin || !duped_stderr ) {
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int fd = open ( "/dev/null", O_RDWR );
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if ( fd == -1 ) {
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DEBUG1 ("can't open `/dev/null': %s\n", strerror (errno) );
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_exit (8);
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}
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/* Make sure that the process has a connected stdin */
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if ( !duped_stdin ) {
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if ( dup2 ( fd, 0 ) == -1 ) {
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DEBUG1("dup2(/dev/null, 0) failed: %s\n",
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strerror (errno) );
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_exit (8);
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}
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}
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if ( !duped_stderr ) {
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if ( dup2 ( fd, 2 ) == -1 ) {
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DEBUG1 ("dup2(dev/null, 2) failed: %s\n", strerror (errno));
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_exit (8);
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}
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}
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close (fd);
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}
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execv ( path, argv );
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/* Hmm: in that case we could write a special status code to the
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* status-pipe */
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DEBUG1 ("exec of `%s' failed\n", path );
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_exit (8);
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} /* end child */
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/* .dup_to is not used in the parent list */
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for (i=0; fd_parent_list[i].fd != -1; i++ ) {
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close (fd_parent_list[i].fd);
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}
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return (int)pid;
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}
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int
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_gpgme_io_waitpid ( int pid, int hang, int *r_status, int *r_signal )
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{
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int status;
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*r_status = 0;
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*r_signal = 0;
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if ( waitpid ( pid, &status, hang? 0 : WNOHANG ) == pid ) {
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if ( WIFSIGNALED (status) ) {
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*r_status = 4; /* Need some value here */
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*r_signal = WTERMSIG (status);
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}
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else if ( WIFEXITED (status) ) {
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*r_status = WEXITSTATUS (status);
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}
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else {
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*r_status = 4; /* oops */
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}
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return 1;
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}
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return 0;
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}
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int
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_gpgme_io_kill ( int pid, int hard )
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{
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return kill ( pid, hard? SIGKILL : SIGTERM );
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}
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/*
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* Select on the list of fds.
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* Returns: -1 = error
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* 0 = timeout or nothing to select
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* >0 = number of signaled fds
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*/
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int
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_gpgme_io_select ( struct io_select_fd_s *fds, size_t nfds )
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{
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static fd_set readfds;
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static fd_set writefds;
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int any, i, max_fd, n, count;
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struct timeval timeout = { 1, 0 }; /* Use a 1s timeout */
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void *dbg_help = NULL;
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FD_ZERO ( &readfds );
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FD_ZERO ( &writefds );
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max_fd = 0;
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if ( _gpgme_debug_level () > 2 )
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DEBUG_BEGIN (dbg_help, "gpgme:select on [ ");
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any = 0;
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for ( i=0; i < nfds; i++ ) {
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if ( fds[i].fd == -1 )
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continue;
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if ( fds[i].frozen ) {
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DEBUG_ADD1 (dbg_help, "f%d ", fds[i].fd );
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}
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else if ( fds[i].for_read ) {
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assert ( !FD_ISSET ( fds[i].fd, &readfds ) );
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FD_SET ( fds[i].fd, &readfds );
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if ( fds[i].fd > max_fd )
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max_fd = fds[i].fd;
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DEBUG_ADD1 (dbg_help, "r%d ", fds[i].fd );
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any = 1;
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}
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else if ( fds[i].for_write ) {
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assert ( !FD_ISSET ( fds[i].fd, &writefds ) );
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FD_SET ( fds[i].fd, &writefds );
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if ( fds[i].fd > max_fd )
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max_fd = fds[i].fd;
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DEBUG_ADD1 (dbg_help, "w%d ", fds[i].fd );
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any = 1;
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}
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fds[i].signaled = 0;
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}
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DEBUG_END (dbg_help, "]" );
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if ( !any )
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return 0;
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do {
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count = select ( max_fd+1, &readfds, &writefds, NULL, &timeout );
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} while ( count < 0 && errno == EINTR);
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if ( count < 0 ) {
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DEBUG1 ("_gpgme_io_select failed: %s\n", strerror (errno) );
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return -1; /* error */
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}
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if ( _gpgme_debug_level () > 2 )
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DEBUG_BEGIN (dbg_help, "select OK [ " );
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if (DEBUG_ENABLED(dbg_help)) {
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for (i=0; i <= max_fd; i++ ) {
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if (FD_ISSET (i, &readfds) )
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DEBUG_ADD1 (dbg_help, "r%d ", i );
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if (FD_ISSET (i, &writefds) )
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DEBUG_ADD1 (dbg_help, "w%d ", i );
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}
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DEBUG_END (dbg_help, "]" );
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}
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/* n is used to optimize it a little bit */
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for ( n=count, i=0; i < nfds && n ; i++ ) {
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if ( fds[i].fd == -1 )
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;
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else if ( fds[i].for_read ) {
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if ( FD_ISSET ( fds[i].fd, &readfds ) ) {
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fds[i].signaled = 1;
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n--;
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}
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}
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else if ( fds[i].for_write ) {
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if ( FD_ISSET ( fds[i].fd, &writefds ) ) {
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fds[i].signaled = 1;
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n--;
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}
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}
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}
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return count;
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}
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#endif /*!HAVE_DOSISH_SYSTEM*/
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