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