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/* call-scd.c - fork of the scdaemon to do SC operations
* Copyright (C) 2001, 2002 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include <unistd.h>
#include <sys/stat.h>
#include "agent.h"
#include "../assuan/assuan.h"
#ifdef _POSIX_OPEN_MAX
#define MAX_OPEN_FDS _POSIX_OPEN_MAX
#else
#define MAX_OPEN_FDS 20
#endif
static ASSUAN_CONTEXT scd_ctx = NULL;
/* callback parameter for learn card */
struct learn_parm_s {
int lines;
size_t size;
char *buffer;
};
/* Fork off the SCdaemon if this has not already been done */
static int
start_scd (void)
{
int rc;
const char *pgmname;
ASSUAN_CONTEXT ctx;
const char *argv[3];
if (scd_ctx)
return 0; /* No need to serialize things because the agent is
expected to tun as a single-thread (or may be in
future using libpth) */
log_debug ("no running SCdaemon - starting it\n");
if (fflush (NULL))
{
log_error ("error flushing pending output: %s\n", strerror (errno));
return seterr (Write_Error);
}
/* FIXME: change the default location of the program */
if (!opt.scdaemon_program || !*opt.scdaemon_program)
opt.scdaemon_program = "../scd/scdaemon";
if ( !(pgmname = strrchr (opt.scdaemon_program, '/')))
pgmname = opt.scdaemon_program;
else
pgmname++;
argv[0] = pgmname;
argv[1] = "--server";
argv[2] = NULL;
/* connect to the pinentry and perform initial handshaking */
rc = assuan_pipe_connect (&ctx, opt.scdaemon_program, (char**)argv, 0);
if (rc)
{
log_error ("can't connect to the SCdaemon: %s\n",
assuan_strerror (rc));
return seterr (No_Scdaemon);
}
scd_ctx = ctx;
log_debug ("connection to SCdaemon established\n");
return 0;
}
static AssuanError
learn_status_cb (void *opaque, const char *line)
{
/* struct learn_parm_s *parm = opaque;*/
const char *keyword = line;
int keywordlen;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 11 && !memcmp (keyword, "KEYPAIRINFO", keywordlen))
{
log_debug ("learn_status_cb: keypair `%s'\n", line);
}
else if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
{
log_debug ("learn_status_cb: serialno `%s'\n", line);
}
else
log_debug ("learn_status_cb: ignoring `%.*s'\n", keywordlen, keyword);
return 0;
}
/* Perform the learn command and return a list of all private keys
stored on the card. */
int
agent_card_learn (void)
{
int rc;
struct learn_parm_s parm;
rc = start_scd ();
if (rc)
return rc;
rc = assuan_transact (scd_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return map_assuan_err (rc);
memset (&parm, 0, sizeof parm);
rc = assuan_transact (scd_ctx, "LEARN --force",
NULL, NULL, NULL, NULL,
learn_status_cb, &parm);
if (rc)
return map_assuan_err (rc);
return 0;
}
static AssuanError
get_serialno_cb (void *opaque, const char *line)
{
char **serialno = opaque;
const char *keyword = line;
const char *s;
int keywordlen, n;
for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
;
while (spacep (line))
line++;
if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
{
if (*serialno)
return ASSUAN_Unexpected_Status;
for (n=0,s=line; hexdigitp (s); s++, n++)
;
if (!n || (n&1)|| !(spacep (s) || !*s) )
return ASSUAN_Invalid_Status;
*serialno = xtrymalloc (n+1);
if (!*serialno)
return ASSUAN_Out_Of_Core;
memcpy (*serialno, line, n);
(*serialno)[n] = 0;
}
return 0;
}
/* Return the serial number of the card or an appropriate error. The
serial number is returned as a hext string. */
int
agent_card_serialno (char **r_serialno)
{
int rc;
char *serialno = NULL;
rc = start_scd ();
if (rc)
return rc;
/* Hmm, do we really need this reset - scddaemon should do this or
we can do this if we for some reason figure out that the
operation might have failed due to a missing RESET. Hmmm, I feel
this is really SCdaemon's duty */
rc = assuan_transact (scd_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
return map_assuan_err (rc);
rc = assuan_transact (scd_ctx, "SERIALNO",
NULL, NULL, NULL, NULL,
get_serialno_cb, &serialno);
if (rc)
{
xfree (serialno);
return map_assuan_err (rc);
}
*r_serialno = serialno;
return 0;
}
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