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 "crypto_box.h"
  15 #include "crypto_sign_ed25519.h"
  16 #include "dnscrypt_client.h"
  17 #include "queue.h"
  18
  19 #ifndef DNS_QUERY_TIMEOUT
  20 # define DNS_QUERY_TIMEOUT 10
  21 #endif
  22
  23 #define DNS_MAX_PACKET_SIZE_UDP_RECV (65536U - 20U - 8U)
  24 #define DNS_MAX_PACKET_SIZE_UDP_SEND 512U
  25
  26 #if DNS_MAX_PACKET_SIZE_UDP_RECV > DNS_MAX_PACKET_SIZE_UDP_SEND
  27 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_RECV
  28 #else
  29 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_SEND
  30 #endif
  31
  32 #ifndef DNS_DEFAULT_LOCAL_PORT
  33 # define DNS_DEFAULT_LOCAL_PORT "53"
  34 #endif
  35 #ifndef DNS_DEFAULT_RESOLVER_PORT
  36 # define DNS_DEFAULT_RESOLVER_PORT "443"
  37 #endif
  38 #ifndef DNS_DEFAULT_STANDARD_DNS_PORT
  39 # define DNS_DEFAULT_STANDARD_DNS_PORT "53"
  40 #endif
  41
  42 #define DNS_HEADER_SIZE  12U
  43 #define DNS_FLAGS_TC      2U
  44 #define DNS_FLAGS_QR    128U
  45 #define DNS_FLAGS2_RA   128U
  46
  47 #define DNS_CLASS_IN      1U
  48 #define DNS_TYPE_TXT     16U
  49 #define DNS_TYPE_OPT     41U
  50
  51 #define DNS_OFFSET_QUESTION DNS_HEADER_SIZE
  52 #define DNS_OFFSET_FLAGS    2U
  53 #define DNS_OFFSET_FLAGS2   3U
  54 #define DNS_OFFSET_QDCOUNT  4U
  55 #define DNS_OFFSET_ANCOUNT  6U
  56 #define DNS_OFFSET_NSCOUNT  8U
  57 #define DNS_OFFSET_ARCOUNT 10U
  58
  59 #define DNS_OFFSET_EDNS_TYPE         0U
  60 #define DNS_OFFSET_EDNS_PAYLOAD_SIZE 2U
  61
  62 #define DNS_DEFAULT_EDNS_PAYLOAD_SIZE 1280U
  63
  64 typedef TAILQ_HEAD(TCPRequestQueue_, TCPRequest_) TCPRequestQueue;
  65 typedef TAILQ_HEAD(UDPRequestQueue_, UDPRequest_) UDPRequestQueue;
  66
  67 typedef struct ProxyContext_ {
  68     uint8_t                  dnscrypt_magic_query[DNSCRYPT_MAGIC_QUERY_LEN];
  69     uint8_t                  provider_publickey[crypto_sign_ed25519_PUBLICKEYBYTES];
  70     uint8_t                  resolver_publickey[crypto_box_PUBLICKEYBYTES];
  71     DNSCryptClient           dnscrypt_client;
  72     CertUpdater              cert_updater;
  73     struct sockaddr_storage  local_sockaddr;
  74     struct sockaddr_storage  resolver_sockaddr;
  75     TCPRequestQueue          tcp_request_queue;
  76     UDPRequestQueue          udp_request_queue;
  77     AppContext              *app_context;
  78     struct event_base       *event_loop;
  79     const char              *local_ip;
  80     const char              *local_port;
  81     const char              *log_file;
  82     const char              *pid_file;
  83     const char              *provider_name;
  84     const char              *provider_publickey_s;
  85     const char              *resolver_ip;
  86     const char              *resolver_port;
  87     struct evconnlistener   *tcp_conn_listener;
  88     struct event            *tcp_accept_timer;
  89     struct event            *udp_listener_event;
  90     struct event            *udp_proxy_resolver_event;
  91     char                    *user_dir;
  92     ev_socklen_t             local_sockaddr_len;
  93     ev_socklen_t             resolver_sockaddr_len;
  94     size_t                   edns_payload_size;
  95     evutil_socket_t          udp_proxy_resolver_handle;
  96     evutil_socket_t          udp_listener_handle;
  97 #ifndef _WIN32
  98     uid_t                    user_id;
  99     gid_t                    user_group;
 100 #endif
 101     unsigned int             connections_count;
 102     unsigned int             connections_count_max;
 103     int                      log_fd;
 104     _Bool                    daemonize;
 105     _Bool                    listeners_started;
 106     _Bool                    tcp_only;
 107 } ProxyContext;
 108
 109 int dnscrypt_proxy_start_listeners(ProxyContext * const proxy_context);
 110
 111 #endif