774 lines
19 KiB
C
774 lines
19 KiB
C
/* w32-glib-io.c - W32 Glib I/O functions
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2004, 2005 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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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 <assert.h>
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#include <errno.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <glib.h>
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#include <windows.h>
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#include <io.h>
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#include "util.h"
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#include "priv-io.h"
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#include "sema.h"
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#include "debug.h"
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#ifndef O_BINARY
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#ifdef _O_BINARY
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#define O_BINARY _O_BINARY
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#else
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#define O_BINARY 0
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#endif
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#endif
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/* This file is an ugly hack to get GPGME working with glib on Windows
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targets. On Windows, you can not select() on file descriptors.
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The only way to check if there is something to read is to read
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something. This means that GPGME can not let glib check for data
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without letting glib also handle the data on Windows targets.
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The ugly consequence is that we need to work on GIOChannels in
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GPGME, creating a glib dependency. Also, we need to export an
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interface for the application to get at GPGME's GIOChannel. There
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is no good way to abstract all this with callbacks, because the
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whole thing is also interconnected with the creation of pipes and
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child processes.
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The following rule applies only to this I/O backend:
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* ALL operations must use the user defined event loop. GPGME can
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not anymore provide its own event loop. This is mostly a sanity
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requirement: Although we have in theory all information we need to
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make the GPGME W32 code for select still work, it would be a big
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complication and require changes throughout GPGME.
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Eventually, we probably have to bite the bullet and make some
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really nice callback interfaces to let the user control all this at
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a per-context level. */
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#define MAX_SLAFD 256
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static struct
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{
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GIOChannel *chan;
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/* The boolean PRIMARY is true if this file descriptor caused the
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allocation of CHAN. Only then should CHAN be destroyed when this
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FD is closed. This, together with the fact that dup'ed file
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descriptors are closed before the file descriptors from which
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they are dup'ed are closed, ensures that CHAN is always valid,
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and shared among all file descriptors refering to the same
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underlying object.
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The logic behind this is that there is only one reason for us to
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dup file descriptors anyway: to allow simpler book-keeping of
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file descriptors shared between GPGME and libassuan, which both
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want to close something. Using the same channel for these
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duplicates works just fine (and in fact, using different channels
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does not work because the W32 backend in glib does not support
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that: One would end up with several competing reader/writer
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threads. */
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int primary;
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} giochannel_table[MAX_SLAFD];
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static GIOChannel *
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find_channel (int fd, int create)
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{
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if (fd < 0 || fd >= MAX_SLAFD)
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return NULL;
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if (create && !giochannel_table[fd].chan)
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{
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giochannel_table[fd].chan = g_io_channel_win32_new_fd (fd);
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giochannel_table[fd].primary = 1;
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g_io_channel_set_encoding (giochannel_table[fd].chan, NULL, NULL);
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g_io_channel_set_buffered (giochannel_table[fd].chan, FALSE);
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}
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return giochannel_table[fd].chan;
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}
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/* Compatibility interface. Obsolete. */
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void *
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gpgme_get_giochannel (int fd)
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{
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return find_channel (fd, 0);
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}
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/* Look up the giochannel for "file descriptor" FD. */
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void *
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gpgme_get_fdptr (int fd)
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{
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return find_channel (fd, 0);
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}
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/* Write the printable version of FD to the buffer BUF of length
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BUFLEN. The printable version is the representation on the command
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line that the child process expects. */
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int
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_gpgme_io_fd2str (char *buf, int buflen, int fd)
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{
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TRACE_BEG1 (DEBUG_SYSIO, "_gpgme_io_fd2str", fd, "fd=%d", fd);
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TRACE_SUC1 ("syshd=%p", _get_osfhandle (fd));
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return snprintf (buf, buflen, "%ld", (long) _get_osfhandle (fd));
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}
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void
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_gpgme_io_subsystem_init (void)
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{
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}
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static struct
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{
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_gpgme_close_notify_handler_t handler;
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void *value;
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} notify_table[MAX_SLAFD];
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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 saved_errno = 0;
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gsize nread;
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GIOChannel *chan;
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GIOStatus status;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_read", fd,
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"buffer=%p, count=%u", buffer, count);
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chan = find_channel (fd, 0);
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if (!chan)
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{
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TRACE_LOG ("no channel registered");
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errno = EINVAL;
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return TRACE_SYSRES (-1);
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}
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TRACE_LOG1 ("channel %p", chan);
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{
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GError *err = NULL;
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status = g_io_channel_read_chars (chan, (gchar *) buffer,
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count, &nread, &err);
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if (err)
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{
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TRACE_LOG2 ("status %i, err %s", status, err->message);
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g_error_free (err);
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}
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}
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if (status == G_IO_STATUS_EOF)
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nread = 0;
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else if (status != G_IO_STATUS_NORMAL)
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{
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TRACE_LOG1 ("status %d", status);
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nread = -1;
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saved_errno = EIO;
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}
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TRACE_LOGBUF (buffer, nread);
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errno = saved_errno;
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return TRACE_SYSRES (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 saved_errno = 0;
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gsize nwritten;
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GIOChannel *chan;
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GIOStatus status;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_write", fd,
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"buffer=%p, count=%u", buffer, count);
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TRACE_LOGBUF (buffer, count);
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chan = find_channel (fd, 0);
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if (!chan)
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{
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TRACE_LOG ("fd %d: no channel registered");
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errno = EINVAL;
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return -1;
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}
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status = g_io_channel_write_chars (chan, (gchar *) buffer, count,
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&nwritten, NULL);
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if (status != G_IO_STATUS_NORMAL)
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{
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nwritten = -1;
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saved_errno = EIO;
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}
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errno = saved_errno;
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return TRACE_SYSRES (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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GIOChannel *chan;
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_pipe", filedes,
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"inherit_idx=%i (GPGME uses it for %s)",
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inherit_idx, inherit_idx ? "reading" : "writing");
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#define PIPEBUF_SIZE 4096
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if (_pipe (filedes, PIPEBUF_SIZE, O_NOINHERIT | O_BINARY) == -1)
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return TRACE_SYSRES (-1);
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/* Make one end inheritable. */
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if (inherit_idx == 0)
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{
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int new_read;
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new_read = _dup (filedes[0]);
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_close (filedes[0]);
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filedes[0] = new_read;
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if (new_read < 0)
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{
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_close (filedes[1]);
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return TRACE_SYSRES (-1);
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}
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}
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else if (inherit_idx == 1)
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{
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int new_write;
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new_write = _dup (filedes[1]);
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_close (filedes[1]);
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filedes[1] = new_write;
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if (new_write < 0)
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{
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_close (filedes[0]);
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return TRACE_SYSRES (-1);
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}
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}
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/* Now we have a pipe with the right end inheritable. The other end
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should have a giochannel. */
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chan = find_channel (filedes[1 - inherit_idx], 1);
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if (!chan)
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{
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int saved_errno = errno;
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_close (filedes[0]);
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_close (filedes[1]);
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errno = saved_errno;
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return TRACE_SYSRES (-1);
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}
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return TRACE_SUC5 ("read=0x%x/%p, write=0x%x/%p, channel=%p",
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filedes[0], (HANDLE) _get_osfhandle (filedes[0]),
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filedes[1], (HANDLE) _get_osfhandle (filedes[1]),
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chan);
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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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TRACE_BEG (DEBUG_SYSIO, "_gpgme_io_close", fd);
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if (fd < 0 || fd >= MAX_SLAFD)
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{
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errno = EBADF;
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return TRACE_SYSRES (-1);
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}
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/* First call the notify handler. */
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if (notify_table[fd].handler)
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{
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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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/* Then do the close. */
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if (giochannel_table[fd].chan)
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{
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if (giochannel_table[fd].primary)
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g_io_channel_shutdown (giochannel_table[fd].chan, 1, NULL);
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else
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_close (fd);
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g_io_channel_unref (giochannel_table[fd].chan);
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giochannel_table[fd].chan = NULL;
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}
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else
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_close (fd);
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TRACE_SUC ();
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return 0;
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}
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int
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_gpgme_io_set_close_notify (int fd, _gpgme_close_notify_handler_t handler,
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void *value)
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{
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TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_set_close_notify", fd,
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"close_handler=%p/%p", handler, value);
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assert (fd != -1);
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if (fd < 0 || fd >= (int) DIM (notify_table))
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{
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errno = EINVAL;
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return TRACE_SYSRES (-1);
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}
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notify_table[fd].handler = handler;
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notify_table[fd].value = value;
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return TRACE_SYSRES (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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GIOChannel *chan;
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GIOStatus status;
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TRACE_BEG (DEBUG_SYSIO, "_gpgme_io_set_nonblocking", fd);
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chan = find_channel (fd, 0);
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if (!chan)
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{
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errno = EIO;
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return TRACE_SYSRES (-1);
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}
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status = g_io_channel_set_flags (chan,
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g_io_channel_get_flags (chan) |
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G_IO_FLAG_NONBLOCK, NULL);
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if (status != G_IO_STATUS_NORMAL)
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{
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#if 0
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/* glib 1.9.2 does not implement set_flags and returns an
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error. */
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errno = EIO;
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return TRACE_SYSRES (-1);
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#else
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TRACE_LOG1 ("g_io_channel_set_flags failed: status=%d (ignored)",
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status);
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#endif
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}
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return TRACE_SYSRES (0);
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}
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static char *
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build_commandline (char **argv)
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{
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int i;
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int n = 0;
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char *buf;
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char *p;
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/* We have to quote some things because under Windows the program
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parses the commandline and does some unquoting. We enclose the
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whole argument in double-quotes, and escape literal double-quotes
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as well as backslashes with a backslash. We end up with a
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trailing space at the end of the line, but that is harmless. */
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for (i = 0; argv[i]; i++)
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{
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p = argv[i];
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/* The leading double-quote. */
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n++;
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while (*p)
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{
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/* An extra one for each literal that must be escaped. */
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if (*p == '\\' || *p == '"')
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n++;
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n++;
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p++;
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}
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/* The trailing double-quote and the delimiter. */
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n += 2;
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}
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/* And a trailing zero. */
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n++;
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buf = p = malloc (n);
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if (!buf)
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return NULL;
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for (i = 0; argv[i]; i++)
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{
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char *argvp = argv[i];
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*(p++) = '"';
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while (*argvp)
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{
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if (*argvp == '\\' || *argvp == '"')
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*(p++) = '\\';
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*(p++) = *(argvp++);
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}
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*(p++) = '"';
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*(p++) = ' ';
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}
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*(p++) = 0;
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return buf;
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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, pid_t *r_pid)
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{
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SECURITY_ATTRIBUTES sec_attr;
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PROCESS_INFORMATION pi =
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{
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NULL, /* returns process handle */
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0, /* returns primary thread handle */
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0, /* returns pid */
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0 /* returns tid */
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};
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STARTUPINFO si;
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char *envblock = NULL;
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int cr_flags = CREATE_DEFAULT_ERROR_MODE
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| GetPriorityClass (GetCurrentProcess ());
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int i;
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char *arg_string;
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int duped_stdin = 0;
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int duped_stderr = 0;
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HANDLE hnul = INVALID_HANDLE_VALUE;
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/* FIXME. */
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int debug_me = 0;
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TRACE_BEG1 (DEBUG_SYSIO, "_gpgme_io_spawn", path,
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"path=%s", path);
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i = 0;
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while (argv[i])
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{
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TRACE_LOG2 ("argv[%2i] = %s", i, argv[i]);
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i++;
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}
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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 = FALSE;
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arg_string = build_commandline (argv);
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if (!arg_string)
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return TRACE_SYSRES (-1);
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memset (&si, 0, sizeof si);
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si.cb = sizeof (si);
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si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
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si.wShowWindow = debug_me? SW_SHOW : SW_HIDE;
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si.hStdInput = GetStdHandle (STD_INPUT_HANDLE);
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si.hStdOutput = GetStdHandle (STD_OUTPUT_HANDLE);
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si.hStdError = GetStdHandle (STD_ERROR_HANDLE);
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for (i = 0; fd_child_list[i].fd != -1; i++)
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{
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if (fd_child_list[i].dup_to == 0)
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{
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si.hStdInput = (HANDLE) _get_osfhandle (fd_child_list[i].fd);
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TRACE_LOG2 ("using 0x%x/%p for stdin", fd_child_list[i].fd,
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_get_osfhandle (fd_child_list[i].fd));
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duped_stdin = 1;
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}
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else if (fd_child_list[i].dup_to == 1)
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{
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si.hStdOutput = (HANDLE) _get_osfhandle (fd_child_list[i].fd);
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TRACE_LOG2 ("using 0x%x/%p for stdout", fd_child_list[i].fd,
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_get_osfhandle (fd_child_list[i].fd));
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}
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else if (fd_child_list[i].dup_to == 2)
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{
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si.hStdError = (HANDLE) _get_osfhandle (fd_child_list[i].fd);
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TRACE_LOG2 ("using 0x%x/%p for stderr", fd_child_list[i].fd,
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_get_osfhandle (fd_child_list[i].fd));
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duped_stderr = 1;
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}
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}
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if (!duped_stdin || !duped_stderr)
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{
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SECURITY_ATTRIBUTES sa;
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memset (&sa, 0, sizeof sa);
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sa.nLength = sizeof sa;
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sa.bInheritHandle = TRUE;
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hnul = CreateFile ("nul",
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GENERIC_READ|GENERIC_WRITE,
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FILE_SHARE_READ|FILE_SHARE_WRITE,
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&sa,
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OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL,
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NULL);
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if (hnul == INVALID_HANDLE_VALUE)
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{
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TRACE_LOG1 ("CreateFile (\"nul\") failed: ec=%d",
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(int) GetLastError ());
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free (arg_string);
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/* FIXME: Should translate the error code. */
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errno = EIO;
|
||
return TRACE_SYSRES (-1);
|
||
}
|
||
/* Make sure that the process has a connected stdin. */
|
||
if (!duped_stdin)
|
||
{
|
||
si.hStdInput = hnul;
|
||
TRACE_LOG1 ("using 0x%x for dummy stdin", (int) hnul);
|
||
}
|
||
/* We normally don't want all the normal output. */
|
||
if (!duped_stderr)
|
||
{
|
||
si.hStdError = hnul;
|
||
TRACE_LOG1 ("using %d for dummy stderr", (int)hnul);
|
||
}
|
||
}
|
||
|
||
cr_flags |= CREATE_SUSPENDED;
|
||
cr_flags |= DETACHED_PROCESS;
|
||
if (!CreateProcessA (path,
|
||
arg_string,
|
||
&sec_attr, /* process security attributes */
|
||
&sec_attr, /* thread security attributes */
|
||
TRUE, /* inherit handles */
|
||
cr_flags, /* creation flags */
|
||
envblock, /* environment */
|
||
NULL, /* use current drive/directory */
|
||
&si, /* startup information */
|
||
&pi)) /* returns process information */
|
||
{
|
||
TRACE_LOG1 ("CreateProcess failed: ec=%d", (int) GetLastError ());
|
||
free (arg_string);
|
||
/* FIXME: Should translate the error code. */
|
||
errno = EIO;
|
||
return TRACE_SYSRES (-1);
|
||
}
|
||
|
||
/* Close the /dev/nul handle if used. */
|
||
if (hnul != INVALID_HANDLE_VALUE)
|
||
{
|
||
if (!CloseHandle (hnul))
|
||
TRACE_LOG1 ("CloseHandle (hnul) failed: ec=%d (ignored)",
|
||
(int) GetLastError ());
|
||
}
|
||
|
||
/* Close the other ends of the pipes. */
|
||
for (i = 0; fd_parent_list[i].fd != -1; i++)
|
||
_gpgme_io_close (fd_parent_list[i].fd);
|
||
|
||
TRACE_LOG4 ("CreateProcess ready: hProcess=%p, hThread=%p, "
|
||
"dwProcessID=%d, dwThreadId=%d",
|
||
pi.hProcess, pi.hThread,
|
||
(int) pi.dwProcessId, (int) pi.dwThreadId);
|
||
if (r_pid)
|
||
*r_pid = (pid_t)pi.dwProcessId;
|
||
|
||
if (ResumeThread (pi.hThread) < 0)
|
||
TRACE_LOG1 ("ResumeThread failed: ec=%d", (int) GetLastError ());
|
||
|
||
if (!CloseHandle (pi.hThread))
|
||
TRACE_LOG1 ("CloseHandle of thread failed: ec=%d",
|
||
(int) GetLastError ());
|
||
|
||
TRACE_SUC1 ("process=%p", pi.hProcess);
|
||
|
||
/* We don't need to wait for the process. */
|
||
CloseHandle (pi.hProcess);
|
||
|
||
return TRACE_SYSRES (0);
|
||
}
|
||
|
||
|
||
/* Select on the list of fds. Returns: -1 = error, 0 = timeout or
|
||
nothing to select, > 0 = number of signaled fds. */
|
||
int
|
||
_gpgme_io_select (struct io_select_fd_s *fds, size_t nfds, int nonblock)
|
||
{
|
||
int npollfds;
|
||
GPollFD *pollfds;
|
||
int *pollfds_map;
|
||
int i;
|
||
int j;
|
||
int any;
|
||
int n;
|
||
int count;
|
||
/* Use a 1s timeout. */
|
||
int timeout = 1000;
|
||
void *dbg_help = NULL;
|
||
TRACE_BEG2 (DEBUG_SYSIO, "_gpgme_io_select", fds,
|
||
"nfds=%u, nonblock=%u", nfds, nonblock);
|
||
|
||
if (nonblock)
|
||
timeout = 0;
|
||
|
||
pollfds = calloc (nfds, sizeof *pollfds);
|
||
if (!pollfds)
|
||
return -1;
|
||
pollfds_map = calloc (nfds, sizeof *pollfds_map);
|
||
if (!pollfds_map)
|
||
{
|
||
free (pollfds);
|
||
return -1;
|
||
}
|
||
npollfds = 0;
|
||
|
||
TRACE_SEQ (dbg_help, "select on [ ");
|
||
any = 0;
|
||
for (i = 0; i < nfds; i++)
|
||
{
|
||
GIOChannel *chan = NULL;
|
||
|
||
if (fds[i].fd == -1)
|
||
continue;
|
||
|
||
if ((fds[i].for_read || fds[i].for_write)
|
||
&& !(chan = find_channel (fds[i].fd, 0)))
|
||
{
|
||
TRACE_ADD1 (dbg_help, "[BAD0x%x ", fds[i].fd);
|
||
TRACE_END (dbg_help, "]");
|
||
assert (!"see log file");
|
||
}
|
||
else if (fds[i].for_read )
|
||
{
|
||
assert(chan);
|
||
g_io_channel_win32_make_pollfd (chan, G_IO_IN, pollfds + npollfds);
|
||
pollfds_map[npollfds] = i;
|
||
TRACE_ADD2 (dbg_help, "r0x%x<%d> ", fds[i].fd, pollfds[npollfds].fd);
|
||
npollfds++;
|
||
any = 1;
|
||
}
|
||
else if (fds[i].for_write)
|
||
{
|
||
assert(chan);
|
||
g_io_channel_win32_make_pollfd (chan, G_IO_OUT, pollfds + npollfds);
|
||
pollfds_map[npollfds] = i;
|
||
TRACE_ADD2 (dbg_help, "w0x%x<%d> ", fds[i].fd, pollfds[npollfds].fd);
|
||
npollfds++;
|
||
any = 1;
|
||
}
|
||
fds[i].signaled = 0;
|
||
}
|
||
TRACE_END (dbg_help, "]");
|
||
if (!any)
|
||
{
|
||
count = 0;
|
||
goto leave;
|
||
}
|
||
|
||
|
||
count = g_io_channel_win32_poll (pollfds, npollfds, timeout);
|
||
if (count < 0)
|
||
{
|
||
int saved_errno = errno;
|
||
errno = saved_errno;
|
||
goto leave;
|
||
}
|
||
|
||
TRACE_SEQ (dbg_help, "select OK [ ");
|
||
if (TRACE_ENABLED (dbg_help))
|
||
{
|
||
for (i = 0; i < npollfds; i++)
|
||
{
|
||
if ((pollfds[i].revents & G_IO_IN))
|
||
TRACE_ADD1 (dbg_help, "r0x%x ", fds[pollfds_map[i]].fd);
|
||
if ((pollfds[i].revents & G_IO_OUT))
|
||
TRACE_ADD1 (dbg_help, "w0x%x ", fds[pollfds_map[i]].fd);
|
||
}
|
||
TRACE_END (dbg_help, "]");
|
||
}
|
||
|
||
/* COUNT is used to stop the lop as soon as possible. */
|
||
for (n = count, i = 0; i < npollfds && n; i++)
|
||
{
|
||
j = pollfds_map[i];
|
||
assert (j >= 0 && j < nfds);
|
||
if (fds[j].fd == -1)
|
||
;
|
||
else if (fds[j].for_read)
|
||
{
|
||
if ((pollfds[i].revents & G_IO_IN))
|
||
{
|
||
fds[j].signaled = 1;
|
||
n--;
|
||
}
|
||
}
|
||
else if (fds[j].for_write)
|
||
{
|
||
if ((pollfds[i].revents & G_IO_OUT))
|
||
{
|
||
fds[j].signaled = 1;
|
||
n--;
|
||
}
|
||
}
|
||
}
|
||
|
||
leave:
|
||
free (pollfds);
|
||
free (pollfds_map);
|
||
return TRACE_SYSRES (count);
|
||
}
|
||
|
||
|
||
int
|
||
_gpgme_io_dup (int fd)
|
||
{
|
||
int newfd;
|
||
GIOChannel *chan;
|
||
|
||
TRACE_BEG1 (DEBUG_SYSIO, "_gpgme_io_dup", fd, "dup (%d)", fd);
|
||
|
||
newfd = _dup (fd);
|
||
if (newfd == -1)
|
||
return TRACE_SYSRES (-1);
|
||
if (newfd < 0 || newfd >= MAX_SLAFD)
|
||
{
|
||
/* New FD won't fit into our table. */
|
||
_close (newfd);
|
||
errno = EIO;
|
||
return TRACE_SYSRES (-1);
|
||
}
|
||
assert (giochannel_table[newfd].chan == NULL);
|
||
|
||
chan = find_channel (fd, 0);
|
||
assert (chan);
|
||
|
||
g_io_channel_ref (chan);
|
||
giochannel_table[newfd].chan = chan;
|
||
giochannel_table[newfd].primary = 0;
|
||
|
||
return TRACE_SYSRES (newfd);
|
||
}
|