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/* decrypt.c - verify signed data
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
* 2007 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "gpg.h"
#include "options.h"
#include "packet.h"
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "util.h"
#include "main.h"
#include "status.h"
#include "i18n.h"
/****************
* Assume that the input is an encrypted message and decrypt
* (and if signed, verify the signature on) it.
* This command differs from the default operation, as it never
* writes to the filename which is included in the file and it
* rejects files which don't begin with an encrypted message.
*/
int
decrypt_message( const char *filename )
{
IOBUF fp;
armor_filter_context_t *afx = NULL;
progress_filter_context_t *pfx;
int rc;
int no_out = 0;
pfx = new_progress_context ();
/* Open the message file. */
fp = iobuf_open(filename);
if (fp && is_secured_file (iobuf_get_fd (fp)))
{
iobuf_close (fp);
fp = NULL;
errno = EPERM;
}
if( !fp ) {
rc = gpg_error_from_syserror ();
log_error (_("can't open `%s': %s\n"), print_fname_stdin(filename),
gpg_strerror (rc));
release_progress_context (pfx);
return rc;
}
handle_progress (pfx, fp, filename);
if( !opt.no_armor ) {
if( use_armor_filter( fp ) ) {
afx = new_armor_context ();
push_armor_filter ( afx, fp );
}
}
if( !opt.outfile ) {
no_out = 1;
opt.outfile = "-";
}
rc = proc_encryption_packets( NULL, fp );
if( no_out )
opt.outfile = NULL;
iobuf_close(fp);
release_armor_context (afx);
release_progress_context (pfx);
return rc;
}
void
decrypt_messages(int nfiles, char *files[])
{
IOBUF fp;
armor_filter_context_t *afx = NULL;
progress_filter_context_t *pfx;
char *p, *output = NULL;
int rc=0,use_stdin=0;
unsigned int lno=0;
if (opt.outfile)
{
log_error(_("--output doesn't work for this command\n"));
return;
}
pfx = new_progress_context ();
if(!nfiles)
use_stdin=1;
for(;;)
{
char line[2048];
char *filename=NULL;
if(use_stdin)
{
if(fgets(line, DIM(line), stdin))
{
lno++;
if (!*line || line[strlen(line)-1] != '\n')
log_error("input line %u too long or missing LF\n", lno);
else
{
line[strlen(line)-1] = '\0';
filename=line;
}
}
}
else
{
if(nfiles)
{
filename=*files;
nfiles--;
files++;
}
}
if(filename==NULL)
break;
print_file_status(STATUS_FILE_START, filename, 3);
output = make_outfile_name(filename);
if (!output)
goto next_file;
fp = iobuf_open(filename);
if (fp)
iobuf_ioctl (fp,3,1,NULL); /* disable fd caching */
if (fp && is_secured_file (iobuf_get_fd (fp)))
{
iobuf_close (fp);
fp = NULL;
errno = EPERM;
}
if (!fp)
{
log_error(_("can't open `%s'\n"), print_fname_stdin(filename));
goto next_file;
}
handle_progress (pfx, fp, filename);
if (!opt.no_armor)
{
if (use_armor_filter(fp))
{
afx = new_armor_context ();
push_armor_filter ( afx, fp );
}
}
rc = proc_packets(NULL, fp);
iobuf_close(fp);
if (rc)
log_error("%s: decryption failed: %s\n", print_fname_stdin(filename),
g10_errstr(rc));
p = get_last_passphrase();
set_next_passphrase(p);
xfree (p);
next_file:
/* Note that we emit file_done even after an error. */
write_status( STATUS_FILE_DONE );
xfree(output);
reset_literals_seen();
}
set_next_passphrase(NULL);
release_armor_context (afx);
release_progress_context (pfx);
}
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