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/*
* jail_packet.h
* potd is licensed under the BSD license:
*
* Copyright (c) 2018 Toni Uhlig <matzeton@googlemail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - The names of its contributors may not be used to endorse or promote
* products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef POTD_JAIL_PACKET_H
#define POTD_JAIL_PACKET_H 1
#include <stdint.h>
#include "pevent.h"
#include "jail.h"
#define INIT_PKTCTX(callback, user_data) \
{ 0, 0, 1, EMPTY_JAILCON, EMPTY_BUF, JC_CLIENT, JP_NONE, NULL, NULL }
/* Remember: PKT_MAXSIZ should always be less or equal then BUFSIZ/2 - sizeof(pkt) */
#define PKT_MAXSIZ 1500 /* pkt->size should not exceed this value */
#define PKT_INVALID 0x0 /* should not happen, otherwise error */
/* Client: jail_packet(PKT_HELLO)) + jail_packet_hello
* Server: jail_packet(RESP_*)
*/
#define PKT_HANDSHAKE 0x1
/* Client: jail_packet(PKT_USER)) + user
* Server: -
*/
#define PKT_USER 0x2
/* Client: jail_packet(PKT_PASS) + pass
* Server: -
*/
#define PKT_PASS 0x3
/* Client: jail_packet(PKT_HANDSHAKE_END)
* Server: -
*/
#define PKT_HANDSHAKE_END 0x4
/* Client: jail_packet(PKT_START)
* Server: jail_packet(RESP_*)
*/
#define PKT_START 0x5
/* Client: jail_packet(PKT_DATA)
* Server: - or jail_packet(PKT_DATA)
*/
#define PKT_DATA 0x6
/* Client: -
* Server: -
*/
#define PKT_RESPOK 0x7
/* Client: -
* Server: -
*/
#define PKT_RESPERR 0x8
typedef enum jail_packet_state {
JP_INVALID = 0, JP_NONE, JP_HANDSHAKE,
JP_HANDSHAKE_END, JP_START, JP_DATA
} jail_packet_state;
typedef enum jail_ctx_type {
JC_INVALID = 0, JC_CLIENT /* protocol handler */,
JC_SERVER /* jail service */
} jail_ctx_type;
#define USER_LEN 255
#define PASS_LEN 255
typedef struct jail_packet_ctx {
int is_valid; /* only used during/after jail handshake */
int ev_active; /* only used in jail_packet_pkt and pkt callbacks */
int ev_readloop; /* only used in jail_client_data */
jail_con connection; /* jail/sandbox fd's */
event_buf writeback_buf; /* protocol write back buffer */
jail_ctx_type ctype; /* Client or Server? */
jail_packet_state pstate; /* packet state */
char *user; /* username used by sandbox */
char *pass; /* password used by sandbox */
} jail_packet_ctx;
int jail_client_send(jail_packet_ctx *pkt_ctx, unsigned char *buf,
size_t siz);
int jail_client_data(event_ctx *ctx, event_buf *in, event_buf *out,
jail_packet_ctx *pkt_ctx);
int jail_server_loop(event_ctx *ctx, jail_packet_ctx *pkt_ctx);
event_ctx *jail_client_handshake(int server_fd, jail_packet_ctx *pkt_ctx);
int jail_server_handshake(event_ctx *ctx, jail_packet_ctx *pkt_ctx);
#endif
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