release/src/router/dnscrypt/src/proxy/dnscrypt_proxy.h

   1
   2 #ifndef __DNSCRYPT_PROXY_H__
   3 #define __DNSCRYPT_PROXY_H__ 1
   4
   5 #include <sys/types.h>
   6
   7 #include <stdint.h>
   8
   9 #include <event2/event.h>
  10 #include <event2/listener.h>
  11
  12 #include "app.h"
  13 #include "cert.h"
  14 #include "dnscrypt_client.h"
  15 #include "queue.h"
  16 #include "sodium.h"
  17
  18 #ifndef DNS_QUERY_TIMEOUT
  19 # define DNS_QUERY_TIMEOUT 10
  20 #endif
  21
  22 #define DNS_MAX_PACKET_SIZE_UDP_RECV (65536U - 20U - 8U)
  23 #define DNS_MAX_PACKET_SIZE_UDP_SEND 512U
  24
  25 #if DNS_MAX_PACKET_SIZE_UDP_RECV > DNS_MAX_PACKET_SIZE_UDP_SEND
  26 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_RECV
  27 #else
  28 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_SEND
  29 #endif
  30
  31 #ifndef DNS_DEFAULT_STANDARD_DNS_PORT
  32 # define DNS_DEFAULT_STANDARD_DNS_PORT "53"
  33 #endif
  34 #ifndef DNS_DEFAULT_LOCAL_PORT
  35 # define DNS_DEFAULT_LOCAL_PORT DNS_DEFAULT_STANDARD_DNS_PORT
  36 #endif
  37 #ifndef DNS_DEFAULT_RESOLVER_PORT
  38 # define DNS_DEFAULT_RESOLVER_PORT "443"
  39 #endif
  40
  41 #define DNS_HEADER_SIZE  12U
  42 #define DNS_FLAGS_TC      2U
  43 #define DNS_FLAGS_QR    128U
  44 #define DNS_FLAGS2_RA   128U
  45
  46 #define DNS_CLASS_IN      1U
  47 #define DNS_TYPE_TXT     16U
  48 #define DNS_TYPE_OPT     41U
  49
  50 #define DNS_OFFSET_QUESTION DNS_HEADER_SIZE
  51 #define DNS_OFFSET_FLAGS    2U
  52 #define DNS_OFFSET_FLAGS2   3U
  53 #define DNS_OFFSET_QDCOUNT  4U
  54 #define DNS_OFFSET_ANCOUNT  6U
  55 #define DNS_OFFSET_NSCOUNT  8U
  56 #define DNS_OFFSET_ARCOUNT 10U
  57
  58 #define DNS_OFFSET_EDNS_TYPE         0U
  59 #define DNS_OFFSET_EDNS_PAYLOAD_SIZE 2U
  60
  61 #define DNS_DEFAULT_EDNS_PAYLOAD_SIZE 1252U
  62
  63 typedef TAILQ_HEAD(TCPRequestQueue_, TCPRequest_) TCPRequestQueue;
  64 typedef TAILQ_HEAD(UDPRequestQueue_, UDPRequest_) UDPRequestQueue;
  65
  66 typedef struct ProxyContext_ {
  67     uint8_t                  dnscrypt_magic_query[DNSCRYPT_MAGIC_QUERY_LEN];
  68     uint8_t                  provider_publickey[crypto_sign_ed25519_PUBLICKEYBYTES];
  69     uint8_t                  resolver_publickey[crypto_box_PUBLICKEYBYTES];
  70     DNSCryptClient           dnscrypt_client;
  71     CertUpdater              cert_updater;
  72     struct sockaddr_storage  local_sockaddr;
  73     struct sockaddr_storage  resolver_sockaddr;
  74     TCPRequestQueue          tcp_request_queue;
  75     UDPRequestQueue          udp_request_queue;
  76     AppContext              *app_context;
  77     struct event_base       *event_loop;
  78     const char              *local_ip;
  79     const char              *log_file;
  80     const char              *pid_file;
  81     const char              *provider_name;
  82     const char              *provider_publickey_s;
  83     const char              *resolver_ip;
  84     struct evconnlistener   *tcp_conn_listener;
  85     struct event            *tcp_accept_timer;
  86     struct event            *udp_listener_event;
  87     struct event            *udp_proxy_resolver_event;
  88     char                    *user_dir;
  89     ev_socklen_t             local_sockaddr_len;
  90     ev_socklen_t             resolver_sockaddr_len;
  91     size_t                   edns_payload_size;
  92     evutil_socket_t          udp_listener_handle;
  93     evutil_socket_t          udp_proxy_resolver_handle;
  94 #ifndef _WIN32
  95     uid_t                    user_id;
  96     gid_t                    user_group;
  97 #endif
  98     unsigned int             connections_count;
  99     unsigned int             connections_count_max;
 100     int                      log_fd;
 101     int                      max_log_level;
 102     _Bool                    daemonize;
 103     _Bool                    listeners_started;
 104     _Bool                    tcp_only;
 105 } ProxyContext;
 106
 107 int dnscrypt_proxy_start_listeners(ProxyContext * const proxy_context);
 108
 109 #endif