/*
 * qstat
 * by Steve Jankowski
 *
 * New Haze query protocol
 * Copyright 2005 Steven Hartland
 *
 * Licensed under the Artistic License, see LICENSE.txt for license terms
 *
 */

#include <sys/types.h>
#ifndef _WIN32
 #include <netinet/in.h>
 #include <sys/socket.h>
#endif
#include <stdlib.h>
#include <stdio.h>

#include "debug.h"
#include "qstat.h"
#include "packet_manip.h"

// Format:
// 1 - 8: Challenge Request / Response
char haze_challenge[] =
{
	'f', 'r', 'd', 'c', '_', '_', '_', '_'
};

int process_haze_packet(struct qserver *server);

// Player headers
#define PLAYER_NAME_HEADER	1
#define PLAYER_SCORE_HEADER	2
#define PLAYER_DEATHS_HEADER	3
#define PLAYER_PING_HEADER	4
#define PLAYER_KILLS_HEADER	5
#define PLAYER_TEAM_HEADER	6
#define PLAYER_OTHER_HEADER	7

// Team headers
#define TEAM_NAME_HEADER	1
#define TEAM_OTHER_HEADER	2

// Challenge response algorithum
// Before sending a qr2 query (type 0x00) the client must first send a
// challenge request (type 0x09).  The host will respond with the same
// packet type containing a string signed integer.
//
// Once the challenge is received the client should convert the string to a
// network byte order integer and embed it in the keys query.
//
// Example:
//
//  challenge request: [0xFE][0xFD][0x09][0x.. 4-byte-instance]
//	challenge response: [0x09][0x.. 4-byte-instance]["-1287574694"]
//	query: [0xFE][0xFD][0x00][0x.. 4-byte-instance][0xb3412b5a "-1287574694"]
//

query_status_t
deal_with_haze_packet(struct qserver *server, char *rawpkt, int pktlen)
{
	char *ptr = rawpkt;
	unsigned int pkt_id;
	unsigned short len;
	unsigned char pkt_max, pkt_index;

	debug(2, "packet...");

	if (pktlen < 8) {
		// invalid packet
		malformed_packet(server, "too short");
		return (PKT_ERROR);
	}

	if (0 == strncmp(ptr, "frdcr", 5)) {
		// challenge response
		ptr += 8;
		server->challenge = 1;

		// Correct the stats due to two phase protocol
		server->retry1++;
		server->n_packets--;
		if ((server->retry1 == n_retries) || server->flags & FLAG_BROADCAST) {
			//server->n_requests--;
		} else {
			server->n_retries--;
		}
		return (send_haze_request_packet(server));
	}

	if (pktlen < 12) {
		// invalid packet
		malformed_packet(server, "too short");
		return (PKT_ERROR);
	}

	server->n_servers++;
	if (server->server_name == NULL) {
		server->ping_total += time_delta(&packet_recv_time, &server->packet_time1);
	} else {
		gettimeofday(&server->packet_time1, NULL);
	}

	// Query version ID
	ptr += 4;

	// Could check the header here should
	// match the 4 byte id sent
	memcpy(&pkt_id, ptr, 4);
	ptr += 4;

	// Max plackets
	pkt_max = ((unsigned char)*ptr);
	ptr++;

	// Packet ID
	pkt_index = ((unsigned char)*ptr);
	ptr++;

	// Query Length
	debug(1, "%04hx, %04hx", (unsigned short)ptr[0], (unsigned short)(ptr[1] << 8));
	// TODO: fix this crap
	memcpy(&len, ptr + 1, 1);
	ptr += 2;

	debug(1, "pkt_index = %d, pkt_max = %d, len = %d", pkt_index, pkt_max, len);
	if (0 != pkt_max) {
		// not a single packet response or callback
		debug(2, "pkt_max %d", pkt_max);

		if (0 == pkt_index) {
			// to prevent reprocessing when we get the call back
			// override the packet flag so it looks like a single
			// packet response
			rawpkt[8] = '\0';
		}

		// add the packet recalcing maxes
		if (!add_packet(server, pkt_id, pkt_index, pkt_max, pktlen, rawpkt, 1)) {
			// fatal error e.g. out of memory
			return (MEM_ERROR);
		}

		// combine_packets will call us recursively
		return (combine_packets(server));
	}

	// if we get here we have what should be a full packet
	return (process_haze_packet(server));
}


query_status_t
deal_with_haze_status(struct qserver *server, char *rawpkt, int pktlen)
{
	char *pkt = rawpkt;
	int len;

	debug(1, "status packet");

	// Server name
	server->server_name = strdup(pkt);
	pkt += strlen(pkt) + 1;

	// gametype
	add_rule(server, "gametype", pkt, NO_FLAGS);
	pkt += strlen(pkt) + 1;

	// map
	len = strlen(pkt);
	// remove .res from map names
	if (0 == strncmp(pkt + len - 4, ".res", 4)) {
		*(pkt + len - 4) = '\0';
	}
	server->map_name = strdup(pkt);
	pkt += len + 1;

	// num players
	server->num_players = atoi(pkt);
	pkt += strlen(pkt) + 1;

	// max_players
	server->max_players = atoi(pkt);
	pkt += strlen(pkt) + 1;

	// hostport
	change_server_port(server, atoi(pkt), 0);
	pkt += strlen(pkt) + 1;

	return (DONE_FORCE);
}


int
process_haze_packet(struct qserver *server)
{
	unsigned char state = 0;
	unsigned char no_players = 0;
	unsigned char total_players = 0;
	unsigned char no_teams = 0;
	unsigned char total_teams = 0;
	int pkt_index = 0;
	SavedData *fragment;

	debug(2, "processing packet...");

	while (NULL != (fragment = get_packet_fragment(pkt_index++))) {
		int pktlen = fragment->datalen;
		char *ptr = fragment->data;
		char *end = ptr + pktlen;
		debug(2, "processing fragment[%d]...", fragment->pkt_index);

		// check we have a full header
		if (pktlen < 12) {
			// invalid packet
			malformed_packet(server, "too short");
			return (PKT_ERROR);
		}

		// skip over the header
		//server->protocol_version = atoi( val+1 );
		ptr += 12;

		// 4 * null's signifies the end of a section

		// Basic Info
		while (0 == state && ptr < end) {
			// name value pairs null seperated
			char *var, *val;
			int var_len, val_len;

			if ((ptr + 4 <= end) && (0x00 == ptr[0]) && (0x00 == ptr[1]) && (0x00 == ptr[2]) && (0x00 == ptr[3])) {
				// end of rules
				state++;
				ptr += 4;
				break;
			}

			var = ptr;
			var_len = strlen(var);
			ptr += var_len + 1;

			if (ptr + 1 > end) {
				malformed_packet(server, "no basic value");
				return (PKT_ERROR);
			}

			val = ptr;
			val_len = strlen(val);
			ptr += val_len + 1;
			debug(2, "var:%s (%d)=%s (%d)\n", var, var_len, val, val_len);

			// Lets see what we've got
			if (0 == strcmp(var, "serverName")) {
				server->server_name = strdup(val);
			} else if (0 == strcmp(var, "map")) {
				// remove .res from map names
				if (0 == strncmp(val + val_len - 4, ".res", 4)) {
					*(val + val_len - 4) = '\0';
				}
				server->map_name = strdup(val);
			} else if (0 == strcmp(var, "maxPlayers")) {
				server->max_players = atoi(val);
			} else if (0 == strcmp(var, "currentPlayers")) {
				server->num_players = no_players = atoi(val);
			} else {
				add_rule(server, var, val, NO_FLAGS);
			}
		}

		// rules
		while (1 == state && ptr < end) {
			// name value pairs null seperated
			char *var, *val;
			int var_len, val_len;

			if ((ptr + 4 <= end) && (0x00 == ptr[0]) && (0x00 == ptr[1]) && (0x00 == ptr[2]) && (0x00 == ptr[3])) {
				// end of basic
				state++;
				ptr += 4;
				break;
			}
			var = ptr;
			var_len = strlen(var);
			ptr += var_len + 1;

			if (ptr + 1 > end) {
				malformed_packet(server, "no basic value");
				return (PKT_ERROR);
			}

			val = ptr;
			val_len = strlen(val);
			ptr += val_len + 1;
			debug(2, "var:%s (%d)=%s (%d)\n", var, var_len, val, val_len);

			// add the rule
			add_rule(server, var, val, NO_FLAGS);
		}

		// players
		while (2 == state && ptr < end) {
			// first we have the header
			char *header = ptr;
			int head_len = strlen(header);
			ptr += head_len + 1;

			if ((ptr + 2 <= end) && (0x00 == ptr[0]) && (0x00 == ptr[1])) {
				// end of player headers
				state++;
				ptr += 2;
				break;
			}

			if (0 == head_len) {
				// no more info
				debug(3, "All done");
				return (DONE_FORCE);
			}

			debug(2, "player header '%s'", header);

			if (ptr > end) {
				malformed_packet(server, "no details for header '%s'", header);
				return (PKT_ERROR);
			}
		}

		while (3 == state && ptr < end) {
			char *header = ptr;
			int head_len = strlen(header);
			int header_type;
			// the next byte is the starting number
			total_players = *ptr++;

			if ((0 == strcmp(header, "player_")) || (0 == strcmp(header, "name_"))) {
				header_type = PLAYER_NAME_HEADER;
			} else if (0 == strcmp(header, "score_")) {
				header_type = PLAYER_SCORE_HEADER;
			} else if (0 == strcmp(header, "deaths_")) {
				header_type = PLAYER_DEATHS_HEADER;
			} else if (0 == strcmp(header, "ping_")) {
				header_type = PLAYER_PING_HEADER;
			} else if (0 == strcmp(header, "kills_")) {
				header_type = PLAYER_KILLS_HEADER;
			} else if (0 == strcmp(header, "team_")) {
				header_type = PLAYER_TEAM_HEADER;
			} else {
				header_type = PLAYER_OTHER_HEADER;
			}

			while (ptr < end) {
				// now each player details
				// add the player
				struct player *player;
				char *val;
				int val_len;

				// check for end of this headers player info
				if (0x00 == *ptr) {
					debug(3, "end of '%s' detail", header);
					ptr++;
					// Note: can't check ( total_players != no_players ) here as we may have more packets
					if ((ptr < end) && (0x00 == *ptr)) {
						debug(3, "end of players");
						// end of all player headers / detail
						state = 2;
						ptr++;
					}
					break;
				}

				player = get_player_by_number(server, total_players);
				if (NULL == player) {
					player = add_player(server, total_players);
				}

				if (ptr >= end) {
					malformed_packet(server, "short player detail");
					return (PKT_ERROR);
				}
				val = ptr;
				val_len = strlen(val);
				ptr += val_len + 1;

				debug(2, "Player[%d][%s]=%s\n", total_players, header, val);

				// lets see what we got
				switch (header_type) {
				case PLAYER_NAME_HEADER:
					player->name = strdup(val);
					break;

				case PLAYER_SCORE_HEADER:
					player->score = atoi(val);
					break;

				case PLAYER_DEATHS_HEADER:
					player->deaths = atoi(val);
					break;

				case PLAYER_PING_HEADER:
					player->ping = atoi(val);
					break;

				case PLAYER_KILLS_HEADER:
					player->frags = atoi(val);
					break;

				case PLAYER_TEAM_HEADER:
					player->team = atoi(val);
					break;

				case PLAYER_OTHER_HEADER:
				default:
					if ('_' == header[head_len - 1]) {
						header[head_len - 1] = '\0';
						player_add_info(player, header, val, NO_FLAGS);
						header[head_len - 1] = '_';
					} else {
						player_add_info(player, header, val, NO_FLAGS);
					}
					break;
				}

				total_players++;

				if (total_players > no_players) {
					malformed_packet(server, "to many players %d > %d", total_players, no_players);
					return (PKT_ERROR);
				}
			}
		}

		if (3 == state) {
			no_teams = (unsigned char)*ptr;
			ptr++;

			debug(2, "No teams:%d\n", no_teams);
			state = 3;
		}

		while (4 == state && ptr < end) {
			// first we have the header
			char *header = ptr;
			int head_len = strlen(header);
			int header_type;
			ptr += head_len + 1;

			if (0 == head_len) {
				// no more info
				debug(3, "All done");
				return (DONE_FORCE);
			}

			debug(2, "team header '%s'", header);
			if (0 == strcmp(header, "team_t")) {
				header_type = TEAM_NAME_HEADER;
			} else {
				header_type = TEAM_OTHER_HEADER;
			}

			// the next byte is the starting number
			total_teams = *ptr++;

			while (ptr < end) {
				// now each teams details
				char *val;
				int val_len;
				char rule[512];

				if (ptr >= end) {
					malformed_packet(server, "short team detail");
					return (PKT_ERROR);
				}
				val = ptr;
				val_len = strlen(val);
				ptr += val_len + 1;

				debug(2, "Team[%d][%s]=%s\n", total_teams, header, val);

				// lets see what we got
				switch (header_type) {
				case TEAM_NAME_HEADER:
					// BF being stupid again teams 1 based instead of 0
					players_set_teamname(server, total_teams + 1, val);
				// N.B. yes no break

				case TEAM_OTHER_HEADER:
				default:
					// add as a server rule
					sprintf(rule, "%s%d", header, total_teams);
					add_rule(server, rule, val, NO_FLAGS);
					break;
				}

				total_teams++;
				if (0x00 == *ptr) {
					// end of this headers teams
					ptr++;
					break;
				}
			}
		}
	}

	return (DONE_FORCE);
}


query_status_t
send_haze_request_packet(struct qserver *server)
{
	char *packet;
	char query_buf[128];
	size_t len;
	unsigned char required = HAZE_BASIC_INFO;

	if (get_server_rules) {
		required |= HAZE_GAME_RULES;
		server->flags |= TF_PLAYER_QUERY;
	}

	if (get_player_info) {
		required |= HAZE_PLAYER_INFO;
		required |= HAZE_TEAM_INFO;
		server->flags |= TF_RULES_QUERY;
	}

	server->flags |= TF_STATUS_QUERY;

	if (server->challenge) {
		// we've recieved a challenge response, send the query + challenge id
		len = sprintf(
			query_buf,
			"frdquery%c%c%c%c%c",
			(unsigned char)(server->challenge >> 24),
			(unsigned char)(server->challenge >> 16),
			(unsigned char)(server->challenge >> 8),
			(unsigned char)(server->challenge >> 0),
			required
			);
		packet = query_buf;
	} else {
		// Either basic v3 protocol or challenge request
		packet = haze_challenge;
		len = sizeof(haze_challenge);
	}

	return (send_packet(server, packet, len));
}