/*
 * The Qubes OS Project, http://www.qubes-os.org
 *
 * Copyright (C) 2010  Rafal Wojtczuk  <rafal@invisiblethingslab.com>
 *
 * This program 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.
 *
 * This program 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

/* See also http://wiki.qubes-os.org/trac/wiki/Qrexec */

#include <stdint.h>

#define QREXEC_DAEMON_SOCKET_DIR "/var/run/qubes"
#define MAX_FDS 256
#define MAX_DATA_CHUNK 4096

#define REXEC_PORT 512

#define QREXEC_AGENT_TRIGGER_PATH "/var/run/qubes/qrexec-agent"
#define QREXEC_AGENT_FDPASS_PATH "/var/run/qubes/qrexec-agent-fdpass"
#define MEMINFO_WRITER_PIDFILE "/var/run/meminfo-writer.pid"
#define QUBES_RPC_MULTIPLEXER_PATH "/usr/lib/qubes/qubes-rpc-multiplexer"

#define QUBES_RPC_MAGIC_CMD "QUBESRPC"

/* Messages sent over control vchan between daemon(dom0) and agent(vm).
 * The same are used between client(dom0) and daemon(dom0).
 */
enum {
    /* daemon->agent messages */

    /* start process in VM and pass its stdin/out/err to dom0
     * struct exec_params passed as data */
    MSG_EXEC_CMDLINE = 0x200,

    /* start process in VM discarding its stdin/out/err (connect to /dev/null)
    * struct exec_params passed as data */
    MSG_JUST_EXEC,

    /* connect to existing process in VM to receive its stdin/out/err
     * struct service_params passed as cmdline field in exec_params */
    MSG_SERVICE_CONNECT,

    /* refuse to start a service (denied by policy, invalid parameters etc)
     * struct service_params passed as data to identify which service call was
     * refused */
    MSG_SERVICE_REFUSED,

    /* agent->daemon messages */
    /* call Qubes RPC service
     * struct trigger_service_params passed as data */
    MSG_TRIGGER_SERVICE = 0x210,
};

/* daemon<->agent and daemon->client */
struct server_header {
	uint32_t type;
	uint32_t connect_domain;
	uint32_t connect_port;
	uint32_t len;
};

/* client->daemon */
struct client_header {
	uint32_t type;
	uint32_t len;
};

struct service_params {
    char ident[32];
};

struct trigger_service_params {
    char service_name[64];
    char target_domain[32];
	struct service_params process_fds;
};

/* data vchan client<->agent, separate for each VM process */
enum {
    /* stdin dom0->VM */
    MSG_DATA_STDIN = 0x190,
    /* stdout VM->dom0 */
    MSG_DATA_STDOUT,
    /* stderr VM->dom0 */
    MSG_DATA_STDERR,
    /* VM process exit code VM->dom0 (int) */
    MSG_DATA_EXIT_CODE,
};

struct data_header {
	uint32_t type;
	uint32_t len;
};