iptogeo/src/protocol.h

/*
  Copyright 2016 Grégory Soutadé

  This file is part of iptogeo.

  iptogeo 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 3 of the License, or
  (at your option) any later version.

  iptogeo 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 iptogeo.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdint.h>

#define REQ_MAGIC 0x179E08EF

typedef struct {
    uint32_t magic;
#define REQ_VERSION 1
    uint8_t version;
#define REQ_REQ  1
#define REQ_RESP 0
    uint8_t req;
#define REQ_IPV4  4
#define REQ_IPV6 16
    uint8_t err;
    uint8_t ip_type; // 4 or 6
    uint32_t flags;
    uint8_t ip[16]; // ipv4 or ipv6
    uint8_t country_code[4];
} request_t;

enum {
    REQ_ERR_NO_ERR = 0,
    REQ_ERR_BAD_MAGIC,
    REQ_ERR_BAD_VERSION,
    REQ_ERR_BAD_REQ_FIELD,
    REQ_ERR_BAD_IP_VERSION,
    REQ_ERR_UNSUPPORTED_IP_VERSION, // 5
    REQ_IP_NOT_FOUND, // Not really an error
};