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+/* Copyright (c) 2014, Vsevolod Stakhov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DNS_PRIVATE_H_
+#define DNS_PRIVATE_H_
+
+#include "uthash.h"
+#include "utlist.h"
+#include "rdns.h"
+#include "upstream.h"
+#include "ref.h"
+
+static const unsigned base = 36;
+static const unsigned t_min = 1;
+static const unsigned t_max = 26;
+static const unsigned skew = 38;
+static const unsigned damp = 700;
+static const unsigned initial_n = 128;
+static const unsigned initial_bias = 72;
+
+static const int dns_port = 53;
+static const int default_io_cnt = 8;
+
+#define UDP_PACKET_SIZE 4096
+
+#define DNS_COMPRESSION_BITS 0xC0
+
+#define DNS_D_MAXLABEL 63 /* + 1 '\0' */
+#define DNS_D_MAXNAME 255 /* + 1 '\0' */
+
+#define RESOLV_CONF "/etc/resolv.conf"
+
+/**
+ * Represents DNS server
+ */
+struct rdns_server {
+ char *name;
+ unsigned int port;
+ unsigned int io_cnt;
+
+ struct rdns_io_channel **io_channels;
+ upstream_entry_t up;
+};
+
+struct rdns_request {
+ struct rdns_resolver *resolver;
+ struct rdns_async_context *async;
+ struct rdns_io_channel *io;
+ struct rdns_reply *reply;
+ enum rdns_request_type type;
+
+ double timeout;
+ unsigned int retransmits;
+
+ int id;
+ struct rdns_request_name *requested_names;
+ unsigned int qcount;
+
+ enum {
+ RDNS_REQUEST_NEW = 0,
+ RDNS_REQUEST_REGISTERED = 1,
+ RDNS_REQUEST_SENT,
+ RDNS_REQUEST_REPLIED
+ } state;
+
+ uint8_t *packet;
+ off_t pos;
+ unsigned int packet_len;
+
+ dns_callback_type func;
+ void *arg;
+
+ void *async_event;
+
+#ifdef TWEETNACL
+ void *curve_plugin_data;
+#endif
+
+ UT_hash_handle hh;
+ ref_entry_t ref;
+};
+
+/**
+ * IO channel for a specific DNS server
+ */
+struct rdns_io_channel {
+ struct rdns_server *srv;
+ struct rdns_resolver *resolver;
+ int sock; /**< persistent socket */
+ bool active;
+ void *async_io; /** async opaque ptr */
+ struct rdns_request *requests; /**< requests in flight */
+ uint64_t uses;
+ ref_entry_t ref;
+};
+
+
+struct rdns_resolver {
+ struct rdns_server *servers;
+ struct rdns_io_channel *io_channels; /**< hash of io chains indexed by socket */
+ struct rdns_async_context *async; /** async callbacks */
+ void *periodic; /** periodic event for resolver */
+
+ struct rdns_plugin *curve_plugin;
+
+ rdns_log_function logger;
+ void *log_data;
+ enum rdns_log_level log_level;
+
+ uint64_t max_ioc_uses;
+ void *refresh_ioc_periodic;
+
+ bool async_binded;
+ bool initialized;
+ ref_entry_t ref;
+};
+
+struct dns_header;
+struct dns_query;
+
+/* Internal DNS structs */
+
+struct dns_header {
+ unsigned int qid :16;
+
+#if BYTE_ORDER == BIG_ENDIAN
+ unsigned int qr:1;
+ unsigned int opcode:4;
+ unsigned int aa:1;
+ unsigned int tc:1;
+ unsigned int rd:1;
+
+ unsigned int ra:1;
+ unsigned int unused:3;
+ unsigned int rcode:4;
+#else
+ unsigned int rd :1;
+ unsigned int tc :1;
+ unsigned int aa :1;
+ unsigned int opcode :4;
+ unsigned int qr :1;
+
+ unsigned int rcode :4;
+ unsigned int unused :3;
+ unsigned int ra :1;
+#endif
+
+ unsigned int qdcount :16;
+ unsigned int ancount :16;
+ unsigned int nscount :16;
+ unsigned int arcount :16;
+};
+
+enum dns_section {
+ DNS_S_QD = 0x01,
+#define DNS_S_QUESTION DNS_S_QD
+
+ DNS_S_AN = 0x02,
+#define DNS_S_ANSWER DNS_S_AN
+
+ DNS_S_NS = 0x04,
+#define DNS_S_AUTHORITY DNS_S_NS
+
+ DNS_S_AR = 0x08,
+#define DNS_S_ADDITIONAL DNS_S_AR
+
+ DNS_S_ALL = 0x0f
+};
+/* enum dns_section */
+
+enum dns_opcode {
+ DNS_OP_QUERY = 0,
+ DNS_OP_IQUERY = 1,
+ DNS_OP_STATUS = 2,
+ DNS_OP_NOTIFY = 4,
+ DNS_OP_UPDATE = 5,
+};
+/* dns_opcode */
+
+enum dns_class {
+ DNS_C_IN = 1,
+
+ DNS_C_ANY = 255
+};
+/* enum dns_class */
+
+struct dns_query {
+ char *qname;
+ unsigned int qtype :16;
+ unsigned int qclass :16;
+};
+
+enum dns_type {
+ DNS_T_A = RDNS_REQUEST_A,
+ DNS_T_NS = RDNS_REQUEST_NS,
+ DNS_T_CNAME = 5,
+ DNS_T_SOA = RDNS_REQUEST_SOA,
+ DNS_T_PTR = RDNS_REQUEST_PTR,
+ DNS_T_MX = RDNS_REQUEST_MX,
+ DNS_T_TXT = RDNS_REQUEST_TXT,
+ DNS_T_AAAA = RDNS_REQUEST_AAAA,
+ DNS_T_SRV = RDNS_REQUEST_SRV,
+ DNS_T_OPT = 41,
+ DNS_T_SSHFP = 44,
+ DNS_T_TLSA = RDNS_REQUEST_TLSA,
+ DNS_T_SPF = RDNS_REQUEST_SPF,
+ DNS_T_ALL = RDNS_REQUEST_ANY
+};
+/* enum dns_type */
+
+static const char dns_rcodes[][32] = {
+ [RDNS_RC_NOERROR] = "no error",
+ [RDNS_RC_FORMERR] = "query format error",
+ [RDNS_RC_SERVFAIL] = "server fail",
+ [RDNS_RC_NXDOMAIN] = "no records with this name",
+ [RDNS_RC_NOTIMP] = "not implemented",
+ [RDNS_RC_REFUSED] = "query refused",
+ [RDNS_RC_YXDOMAIN] = "YXDOMAIN",
+ [RDNS_RC_YXRRSET] = "YXRRSET",
+ [RDNS_RC_NXRRSET] = "NXRRSET",
+ [RDNS_RC_NOTAUTH] = "not authorized",
+ [RDNS_RC_NOTZONE] = "no such zone",
+ [RDNS_RC_TIMEOUT] = "query timed out",
+ [RDNS_RC_NETERR] = "network error",
+ [RDNS_RC_NOREC] = "requested record is not found"
+};
+
+static const char dns_types[][16] = {
+ [RDNS_REQUEST_A] = "A request",
+ [RDNS_REQUEST_NS] = "NS request",
+ [RDNS_REQUEST_PTR] = "PTR request",
+ [RDNS_REQUEST_MX] = "MX request",
+ [RDNS_REQUEST_TXT] = "TXT request",
+ [RDNS_REQUEST_SRV] = "SRV request",
+ [RDNS_REQUEST_SPF] = "SPF request",
+ [RDNS_REQUEST_AAAA] = "AAAA request",
+ [RDNS_REQUEST_TLSA] = "TLSA request",
+ [RDNS_REQUEST_ANY] = "ANY request"
+};
+
+
+#endif /* DNS_PRIVATE_H_ */