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/* command.c - SCdaemon command handler
* 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 <unistd.h>
#include "scdaemon.h"
#include "../assuan/assuan.h"
#define set_error(e,t) assuan_set_error (ctx, ASSUAN_ ## e, (t))
/* Data used to associate an Assuan context with local server data */
struct server_local_s {
ASSUAN_CONTEXT assuan_ctx;
};
/* Check whether the option NAME appears in LINE */
static int
has_option (const char *line, const char *name)
{
const char *s;
int n = strlen (name);
s = strstr (line, name);
return (s && (s == line || spacep (s-1)) && (!s[n] || spacep (s+n)));
}
/* Note, that this reset_notify is also used for cleanup purposes. */
static void
reset_notify (ASSUAN_CONTEXT ctx)
{
CTRL ctrl = assuan_get_pointer (ctx);
if (ctrl->card_ctx)
{
card_close (ctrl->card_ctx);
ctrl->card_ctx = NULL;
}
}
static int
option_handler (ASSUAN_CONTEXT ctx, const char *key, const char *value)
{
return 0;
}
/* LEARN [--force]
Learn all useful information of the currently inserted card. When
used without the force options, the command might to an INQUIRE
like this:
INQUIRE KNOWNCARDP <hexstring_with_serialNumber> <timestamp>
The client should just send an "END" if the processing should go on
or a "CANCEL" to force the function to terminate with a Cancel
error message.
*/
static int
cmd_learn (ASSUAN_CONTEXT ctx, char *line)
{
CTRL ctrl = assuan_get_pointer (ctx);
int rc = 0;
/* if this is the first command issued for a new card, open the card and
and create a context */
if (!ctrl->card_ctx)
{
rc = card_open (&ctrl->card_ctx);
if (rc)
return map_to_assuan_status (rc);
}
/* Unless the force option is used we try a shortcut by identifying
the card using a serial number and inquiring the client with
that. The client may choose to cancel the operation if he already
knows about this card */
if (!has_option (line, "--force"))
{
char *serial;
time_t stamp;
char *command;
rc = card_get_serial_and_stamp (ctrl->card_ctx, &serial, &stamp);
if (rc)
return map_to_assuan_status (rc);
rc = asprintf (&command, "KNOWNCARDP %s %lu",
serial, (unsigned long)stamp);
xfree (serial);
if (rc < 0)
return ASSUAN_Out_Of_Core;
rc = 0;
rc = assuan_inquire (ctx, command, NULL, NULL, 0);
free (command); /* (must use standard free here) */
if (rc)
{
if (rc != ASSUAN_Canceled)
log_error ("inquire KNOWNCARDP failed: %s\n",
assuan_strerror (rc));
return rc;
}
/* not canceled, so we have to proceeed */
}
return map_to_assuan_status (rc);
}
/* Tell the assuan library about our commands */
static int
register_commands (ASSUAN_CONTEXT ctx)
{
static struct {
const char *name;
int cmd_id;
int (*handler)(ASSUAN_CONTEXT, char *line);
} table[] = {
{ "LEARN", 0, cmd_learn },
{ "", ASSUAN_CMD_INPUT, NULL },
{ "", ASSUAN_CMD_OUTPUT, NULL },
{ NULL }
};
int i, j, rc;
for (i=j=0; table[i].name; i++)
{
rc = assuan_register_command (ctx,
table[i].cmd_id? table[i].cmd_id
: (ASSUAN_CMD_USER + j++),
table[i].name, table[i].handler);
if (rc)
return rc;
}
assuan_set_hello_line (ctx, "GNU Privacy Guard's Smartcard server ready");
assuan_register_reset_notify (ctx, reset_notify);
assuan_register_option_handler (ctx, option_handler);
return 0;
}
/* Startup the server. If LISTEN_FD is given as -1, this is simple
piper server, otherwise it is a regular server */
void
scd_command_handler (int listen_fd)
{
int rc;
ASSUAN_CONTEXT ctx;
struct server_control_s ctrl;
memset (&ctrl, 0, sizeof ctrl);
scd_init_default_ctrl (&ctrl);
if (listen_fd == -1)
{
int filedes[2];
filedes[0] = 0;
filedes[1] = 1;
rc = assuan_init_pipe_server (&ctx, filedes);
}
else
{
rc = assuan_init_socket_server (&ctx, listen_fd);
}
if (rc)
{
log_error ("failed to initialize the server: %s\n",
assuan_strerror(rc));
scd_exit (2);
}
rc = register_commands (ctx);
if (rc)
{
log_error ("failed to register commands with Assuan: %s\n",
assuan_strerror(rc));
scd_exit (2);
}
assuan_set_pointer (ctx, &ctrl);
ctrl.server_local = xcalloc (1, sizeof *ctrl.server_local);
ctrl.server_local->assuan_ctx = ctx;
if (DBG_ASSUAN)
assuan_set_log_stream (ctx, log_get_stream ());
for (;;)
{
rc = assuan_accept (ctx);
if (rc == -1)
{
break;
}
else if (rc)
{
log_info ("Assuan accept problem: %s\n", assuan_strerror (rc));
break;
}
rc = assuan_process (ctx);
if (rc)
{
log_info ("Assuan processing failed: %s\n", assuan_strerror (rc));
continue;
}
}
reset_notify (ctx); /* used for cleanup */
assuan_deinit_server (ctx);
}
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