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 #include <stdio.h>
   9 #include <time.h>
  10
  11 #include <event2/event.h>
  12 #include <event2/listener.h>
  13 #include <sodium.h>
  14
  15 #include "app.h"
  16 #include "cert.h"
  17 #include "dnscrypt_client.h"
  18 #include "queue.h"
  19
  20 #ifndef DNS_QUERY_TIMEOUT
  21 # define DNS_QUERY_TIMEOUT 10
  22 #endif
  23
  24 #define DNS_MAX_PACKET_SIZE_UDP_RECV (65536U - 20U - 8U)
  25 #define DNS_MAX_PACKET_SIZE_UDP_NO_EDNS_SEND 512U
  26
  27 #if DNS_MAX_PACKET_SIZE_UDP_RECV > DNS_MAX_PACKET_SIZE_UDP_NO_EDNS_SEND
  28 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_RECV
  29 #else
  30 # define DNS_MAX_PACKET_SIZE_UDP DNS_MAX_PACKET_SIZE_UDP_NO_EDNS_SEND
  31 #endif
  32
  33 #ifndef DNS_DEFAULT_STANDARD_DNS_PORT
  34 # define DNS_DEFAULT_STANDARD_DNS_PORT "53"
  35 #endif
  36 #ifndef DNS_DEFAULT_LOCAL_PORT
  37 # define DNS_DEFAULT_LOCAL_PORT DNS_DEFAULT_STANDARD_DNS_PORT
  38 #endif
  39 #ifndef DNS_DEFAULT_RESOLVER_PORT
  40 # define DNS_DEFAULT_RESOLVER_PORT "443"
  41 #endif
  42
  43 #ifndef DEFAULT_RESOLVERS_LIST
  44 # ifdef _WIN32
  45 #  define DEFAULT_RESOLVERS_LIST "dnscrypt-resolvers.csv"
  46 # else
  47 #  define DEFAULT_RESOLVERS_LIST PKGDATADIR "/dnscrypt-resolvers.csv"
  48 # endif
  49 #endif
  50
  51 #ifndef DEFAULT_RESOLVER_NAME
  52 # define DEFAULT_RESOLVER_NAME NULL
  53 #endif
  54
  55 #define DNS_HEADER_SIZE  12U
  56 #define DNS_FLAGS_TC      2U
  57 #define DNS_FLAGS_QR    128U
  58 #define DNS_FLAGS2_RA   128U
  59
  60 #define DNS_CLASS_IN      1U
  61 #define DNS_TYPE_TXT     16U
  62 #define DNS_TYPE_OPT     41U
  63
  64 #define DNS_OFFSET_QUESTION DNS_HEADER_SIZE
  65 #define DNS_OFFSET_FLAGS    2U
  66 #define DNS_OFFSET_FLAGS2   3U
  67 #define DNS_OFFSET_QDCOUNT  4U
  68 #define DNS_OFFSET_ANCOUNT  6U
  69 #define DNS_OFFSET_NSCOUNT  8U
  70 #define DNS_OFFSET_ARCOUNT 10U
  71
  72 #define DNS_OFFSET_EDNS_TYPE         0U
  73 #define DNS_OFFSET_EDNS_PAYLOAD_SIZE 2U
  74
  75 #define DNS_DEFAULT_EDNS_PAYLOAD_SIZE 1252U
  76
  77 #define DNSCRYPT_PROTOCOL_VERSIONS "2"
  78
  79 #define DNSCRYPT_EXIT_CERT_NOCERTS 2
  80 #define DNSCRYPT_EXIT_CERT_TIMEOUT 3
  81 #define DNSCRYPT_EXIT_CERT_MARGIN  4
  82
  83 typedef TAILQ_HEAD(TCPRequestQueue_, TCPRequest_) TCPRequestQueue;
  84 typedef TAILQ_HEAD(UDPRequestQueue_, UDPRequest_) UDPRequestQueue;
  85
  86 typedef struct ProxyContext_ {
  87     uint8_t                  dnscrypt_magic_query[DNSCRYPT_MAGIC_QUERY_LEN];
  88     uint8_t                  provider_publickey[crypto_sign_ed25519_PUBLICKEYBYTES];
  89     uint8_t                  resolver_publickey[crypto_box_PUBLICKEYBYTES];
  90     DNSCryptClient           dnscrypt_client;
  91     CertUpdater              cert_updater;
  92     struct sockaddr_storage  local_sockaddr;
  93     struct sockaddr_storage  resolver_sockaddr;
  94     TCPRequestQueue          tcp_request_queue;
  95     UDPRequestQueue          udp_request_queue;
  96     AppContext              *app_context;
  97     struct event_base       *event_loop;
  98     FILE                    *log_fp;
  99     const char              *client_key_file;
 100     const char              *local_ip;
 101     const char              *log_file;
 102     const char              *pid_file;
 103     const char              *provider_name;
 104     const char              *provider_publickey_s;
 105     const char              *resolvers_list;
 106     const char              *resolver_name;
 107     const char              *resolver_ip;
 108     struct evconnlistener   *tcp_conn_listener;
 109     struct event            *tcp_accept_timer;
 110     struct event            *udp_listener_event;
 111     struct event            *udp_proxy_resolver_event;
 112     char                    *user_dir;
 113     ev_socklen_t             local_sockaddr_len;
 114     ev_socklen_t             resolver_sockaddr_len;
 115     size_t                   edns_payload_size;
 116     size_t                   udp_current_max_size;
 117     size_t                   udp_max_size;
 118     evutil_socket_t          tcp_listener_handle;
 119     evutil_socket_t          udp_listener_handle;
 120     evutil_socket_t          udp_proxy_resolver_handle;
 121 #ifndef _WIN32
 122     uid_t                    user_id;
 123     gid_t                    user_group;
 124 #endif
 125     time_t                   test_cert_margin;
 126     unsigned int             connections_count;
 127     unsigned int             connections_count_max;
 128     int                      max_log_level;
 129     _Bool                    daemonize;
 130     _Bool                    ephemeral_keys;
 131     _Bool                    listeners_started;
 132     _Bool                    tcp_only;
 133     _Bool                    test_only;
 134 } ProxyContext;
 135
 136 int dnscrypt_proxy_start_listeners(ProxyContext * const proxy_context);
 137
 138 #endif