hdnssss是什么意思 大写26个字母大小写
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时间：2017-04-07 13:58
*(选填限IP地址)
1.主机[A]记录描述: 主机地址记录。在 DNS 域名与 IP 地址之间建立映射关系语法: owner class ttl A IP_v4_address 例子: host1.. IN A 127.0.0.12.别名[CNAME]描述: 用来表示用在该区域中的其它资源记录类型中已指定名称的替补或别名 DNS 域名。语法: owner ttl class AFSDB subtype server_host_name 例子: aliasname.. AFSDB 1 truename..3.主机信息[HINFO]描述: 用来说明映射到特定 DNS 主机名的 CPU 类型和操作系统类型的 RFC-1700 保留字符串类型，这个信息可以被应用程序通信协议使用。语法: owner ttl class HINFO cpu_type os_type 例子: my-computer-name.. HINFO INTEL-386 WIN324.邮箱[MB]描述: 用来将指定的域邮箱名映射到这个邮箱的主机的当前区域中的主机地址记录语法: owner ttl class MB mailbox_hostname 例子: mailbox.. MB mailhost1.5.邮箱或通信信息 MINFO描述: 用来指定负责维护该记录中特定通信名单或邮箱的联系域邮箱名称。同时，还被用来指定接收与该记录中特定通信名单或邮箱有关的错误信息的邮箱语法: owner ttl class MINFO responsible_mailbox error_mailbox 例子: administrator.. MINFO resp-mbox. err-mbox.6.邮件交换器 [MX]描述: 用来向特定邮件交换器提供消息路由，该主机作为指定 DNS 域名的邮件交换器。MX 记录需要一个16-位整数来表示消息路由中的主机优先级，多个邮件交换在消息一中被指定。对于这个记录类型中的每个邮件交换主机，需要一个相应的主机地址类型记录。语法: owner ttl class MX preference mail_exchanger_host 例子: . MX 10 mailserver1.7.指针记录 [PTR]描述:用来指向域名空间中的某个位置。PTR记录通常在特殊域中来执行地址到名称镜像的反向搜索。每个记录提供要指向域名称空间的某个其它位置的简单数据。 Syntax: owner ttl class PTR targeted_domain_name 例子: 1.0.0.10.in-addr.arpa. PTR host..8.服务记录 [SRV]描述: SRV 资源记录允许管理员使用单一 DNS 域的多个服务器，容易的用管理功能将 TCP/IP 服务从一个主机移到另一个主机，并且将服务提供的程序主机分派为服务的主服务器，将其它的分派为辅助的语法: service.protocol.name ttl class SRV preference weight port target 例子: ldap.tcp.ms-dcs SRV 0 0 389 dc1. SRV 10 0 389 dc2.9.已知服务记录 [WKS]描述: 用来描述一个特定 IP 地址上特定通讯协议支持的 TCP/IP 服务，它提供 TCP 和 UDP 可使用性信息。如果服务器同时支持 TCP 和 UDP 的已知服务，或者有多个支持服务的 IP 地址，多个 WKS 记录会被使用语法: owner ttl class WKS address protocol service_list 例子: . WKS 10.0.0.1 TCP ( telnet smtp ftp ) 在"起始颁发机构" SOA 中，记录了这个 Zone 中 DNS 服务器是那一台主机，也记录着负责本 zone 的管理员的邮件地址，如果以后在安装邮件服务器需要修改该信息时，注意将邮件地址中的 "@" 符改为句点 "." ，因为 "@" 是保留字，代表 zone；另外，要使用域完整名称 FQDN，不要漏掉最后的句点。可以通过 "zone→属性→起始颁发机构"对管理员邮件地址进行修改。
配色/在线汉字/ sss-libev
项目语言:C
权限:read-only(如需更高权限请先加入项目)
sss-libev/
Index: udns.h
===================================================================
--- udns.h (revision 0)
+++ udns.h (revision 2)
@@ -0,0 +1,778 @@
+/* udns.h
header file for the UDNS library.
Copyright (C) 2005
Michael Tokarev &mjt@corpit.ru&
This file is part of UDNS library, an async DNS stub resolver.
This libr you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software F either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA
+#ifndef UDNS_VERSION /* include guard */
+#define UDNS_VERSION &0.4&
+#ifdef __MINGW32__
+# ifdef UDNS_DYNAMIC_LIBRARY
ifdef DNS_LIBRARY_BUILD
define UDNS_API __declspec(dllexport)
define UDNS_DATA_API __declspec(dllexport)
define UDNS_API __declspec(dllimport)
define UDNS_DATA_API __declspec(dllimport)
+#ifndef UDNS_API
+# define UDNS_API
+#ifndef UDNS_DATA_API
+# define UDNS_DATA_API
+#include &sys/types.h&
/* for time_t */
+#ifdef __cplusplus
+extern &C& {
+/* forward declarations if sockets stuff isn't #include'd */
+struct in_
+struct in6_
+/**************************************************************************/
+/**************** Common definitions **************************************/
+UDNS_API const char *
+dns_version(void);
+struct dns_
+struct dns_
+/* shorthand for [const] unsigned char */
+typedef unsigned char dnsc_t;
+typedef const unsigned char dnscc_t;
+#define DNS_MAXDN 255 /* max DN length */
+#define DNS_DNPAD 1 /* padding for DN buffers */
+#define DNS_MAXLABEL 63 /* max DN label length */
+#define DNS_MAXNAME 1024 /* max asciiz domain name length */
+#define DNS_HSIZE 12 /* DNS packet header size */
+#define DNS_PORT 53 /* default domain port */
+#define DNS_MAXSERV 6 /* max servers to consult */
+#define DNS_MAXPACKET 512 /* max traditional-DNS UDP packet size */
+#define DNS_EDNS0PACKET 4096 /* EDNS0 packet size to use */
+enum dns_class { /* DNS RR Classes */
DNS_C_INVALID = 0, /* invalid class */
DNS_C_IN = 1, /* Internet */
DNS_C_CH = 3, /* CHAOS */
DNS_C_HS = 4, /* HESIOD */
DNS_C_ANY = 255 /* wildcard */
+enum dns_type {
/* DNS RR Types */
DNS_T_INVALID
= 0, /* Cookie. */
= 1, /* Host address. */
= 2, /* Authoritative server. */
= 3, /* Mail destination. */
= 4, /* Mail forwarder. */
DNS_T_CNAME
= 5, /* Canonical name. */
= 6, /* Start of authority zone. */
= 7, /* Mailbox domain name. */
= 8, /* Mail group member. */
= 9, /* Mail rename name. */
DNS_T_NULL
= 10, /* Null resource record. */
= 11, /* Well known service. */
= 12, /* Domain name pointer. */
DNS_T_HINFO
= 13, /* Host information. */
DNS_T_MINFO
= 14, /* Mailbox information. */
= 15, /* Mail routing information. */
= 16, /* Text strings. */
= 17, /* Responsible person. */
DNS_T_AFSDB
= 18, /* AFS cell database. */
= 19, /* X_25 calling address. */
DNS_T_ISDN
= 20, /* ISDN calling address. */
= 21, /* Router. */
DNS_T_NSAP
= 22, /* NSAP address. */
DNS_T_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
= 24, /* Security signature. */
= 25, /* Security key. */
= 26, /* X.400 mail mapping. */
DNS_T_GPOS
= 27, /* Geographical position (withdrawn). */
DNS_T_AAAA
= 28, /* Ip6 Address. */
= 29, /* Location Information. */
= 30, /* Next domain (security). */
= 31, /* Endpoint identifier. */
DNS_T_NIMLOC
= 32, /* Nimrod Locator. */
= 33, /* Server Selection. */
DNS_T_ATMA
= 34, /* ATM Address */
DNS_T_NAPTR
= 35, /* Naming Authority PoinTeR */
= 36, /* Key Exchange */
DNS_T_CERT
= 37, /* Certification record */
= 38, /* IPv6 address (deprecates AAAA) */
DNS_T_DNAME
= 39, /* Non-terminal DNAME (for IPv6) */
DNS_T_SINK
= 40, /* Kitchen sink (experimentatl) */
= 41, /* EDNS0 option (meta-RR) */
= 43, /* DNSSEC */
DNS_T_SSHFP
DNS_T_IPSECKEY = 45,
DNS_T_RRSIG
= 46, /* DNSSEC */
DNS_T_NSEC
= 47, /* DNSSEC */
DNS_T_DNSKEY
DNS_T_DHCID
DNS_T_NSEC3
DNS_T_NSEC3PARAMS = 51,
DNS_T_TALINK
= 58, /* draft-ietf-dnsop-trust-history */
DNS_T_UINFO
DNS_T_UNSPEC
DNS_T_TSIG
= 250, /* Transaction signature. */
DNS_T_IXFR
= 251, /* Incremental zone transfer. */
DNS_T_AXFR
= 252, /* Transfer zone of authority. */
DNS_T_MAILB
= 253, /* Transfer mailbox records. */
DNS_T_MAILA
= 254, /* Transfer mail agent records. */
= 255, /* Wildcard match. */
DNS_T_ZXFR
= 256, /* BIND-specific, nonstandard. */
= 32769, /* RFC , DNSSEC Lookaside Validation */
+/**************************************************************************/
+/**************** Domain Names (DNs) **************************************/
+/* return length of the DN */
+UDNS_API unsigned
+dns_dnlen(dnscc_t *dn);
+/* return #of labels in a DN */
+UDNS_API unsigned
+dns_dnlabels(dnscc_t *dn);
+/* lower- and uppercase single DN char */
+#define DNS_DNLC(c) ((c) &= 'A' && (c) &= 'Z' ? (c) - 'A' + 'a' : (c))
+#define DNS_DNUC(c) ((c) &= 'a' && (c) &= 'z' ? (c) - 'a' + 'A' : (c))
+/* compare the DNs, return dnlen of equal or 0 if not */
+UDNS_API unsigned
+dns_dnequal(dnscc_t *dn1, dnscc_t *dn2);
+/* copy one DN to another, size checking */
+UDNS_API unsigned
+dns_dntodn(dnscc_t *sdn, dnsc_t *ddn, unsigned ddnsiz);
+/* convert asciiz string of length namelen (0 to use strlen) to DN */
+UDNS_API int
+dns_ptodn(const char *name, unsigned namelen,
dnsc_t *dn, unsigned dnsiz, int *isabs);
+/* simpler form of dns_ptodn() */
+#define dns_sptodn(name,dn,dnsiz) dns_ptodn((name),0,(dn),(dnsiz),0)
+UDNS_DATA_API extern dnscc_t dns_inaddr_arpa_dn[14];
+#define DNS_A4RSIZE 30
+UDNS_API int
+dns_a4todn(const struct in_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API int
+dns_a4ptodn(const struct in_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API dnsc_t *
+dns_a4todn_(const struct in_addr *addr, dnsc_t *dn, dnsc_t *dne);
+UDNS_DATA_API extern dnscc_t dns_ip6_arpa_dn[10];
+#define DNS_A6RSIZE 74
+UDNS_API int
+dns_a6todn(const struct in6_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API int
+dns_a6ptodn(const struct in6_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API dnsc_t *
+dns_a6todn_(const struct in6_addr *addr, dnsc_t *dn, dnsc_t *dne);
+/* convert DN into asciiz string */
+UDNS_API int
+dns_dntop(dnscc_t *dn, char *name, unsigned namesiz);
+/* convert DN into asciiz string, using static buffer (NOT thread-safe!) */
+UDNS_API const char *
+dns_dntosp(dnscc_t *dn);
+/* return buffer size (incl. null byte) required for asciiz form of a DN */
+UDNS_API unsigned
+dns_dntop_size(dnscc_t *dn);
+/* either wrappers or reimplementations for inet_ntop() and inet_pton() */
+UDNS_API const char *dns_ntop(int af, const void *src, char *dst, int size);
+UDNS_API int dns_pton(int af, const char *src, void *dst);
+/**************************************************************************/
+/**************** DNS raw packet layout ***********************************/
+enum dns_rcode { /* reply codes */
DNS_R_NOERROR
= 0, /* ok, no error */
DNS_R_FORMERR
= 1, /* format error */
DNS_R_SERVFAIL = 2, /* server failed */
DNS_R_NXDOMAIN = 3, /* domain does not exists */
DNS_R_NOTIMPL
= 4, /* not implemented */
DNS_R_REFUSED
= 5, /* query refused */
/* these are for BIND_UPDATE */
DNS_R_YXDOMAIN = 6, /* Name exists */
DNS_R_YXRRSET
= 7, /* RRset exists */
DNS_R_NXRRSET
= 8, /* RRset does not exist */
DNS_R_NOTAUTH
= 9, /* Not authoritative for zone */
DNS_R_NOTZONE
= 10, /* Zone of record different from zone section */
/*ns_r_max = 11,*/
/* The following are TSIG extended errors */
DNS_R_BADSIG
DNS_R_BADKEY
DNS_R_BADTIME
+static __inline unsigned dns_get16(dnscc_t *s) {
return ((unsigned)s[0]&&8) | s[1];
+static __inline unsigned dns_get32(dnscc_t *s) {
return ((unsigned)s[0]&&24) | ((unsigned)s[1]&&16)
| ((unsigned)s[2]&&8) | s[3];
+static __inline dnsc_t *dns_put16(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n && 8) & 255); *d++ = (dnsc_t)(n & 255);
+static __inline dnsc_t *dns_put32(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n && 24) & 255); *d++ = (dnsc_t)((n && 16) & 255);
*d++ = (dnsc_t)((n &&
8) & 255); *d++ = (dnsc_t)(n & 255);
+/* DNS Header layout */
+ /* bytes 0:1 - query ID */
DNS_H_QID1 = 0,
DNS_H_QID2 = 1,
DNS_H_QID = DNS_H_QID1,
+#define dns_qid(pkt) dns_get16((pkt)+DNS_H_QID)
+ /* byte 2: flags1 */
DNS_H_F1 = 2,
DNS_HF1_QR = 0x80, /* query response flag */
+#define dns_qr(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_QR)
DNS_HF1_OPCODE = 0x78, /* opcode, 0 = query */
+#define dns_opcode(pkt) (((pkt)[DNS_H_F1]&DNS_HF1_OPCODE)&&3)
DNS_HF1_AA = 0x04, /* auth answer */
+#define dns_aa(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_AA)
DNS_HF1_TC = 0x02, /* truncation flag */
+#define dns_tc(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_TC)
DNS_HF1_RD = 0x01, /* recursion desired (may be set in query) */
+#define dns_rd(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_RD)
+ /* byte 3: flags2 */
DNS_H_F2 = 3,
DNS_HF2_RA = 0x80, /* recursion available */
+#define dns_ra(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RA)
DNS_HF2_Z = 0x40, /* reserved */
DNS_HF2_AD = 0x20, /* DNSSEC: authentic data */
+#define dns_ad(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_AD)
DNS_HF2_CD = 0x10, /* DNSSEC: checking disabled */
+#define dns_cd(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_CD)
DNS_HF2_RCODE = 0x0f, /* response code, DNS_R_XXX above */
+#define dns_rcode(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RCODE)
+ /* bytes 4:5: qdcount, numqueries */
DNS_H_QDCNT1 = 4,
DNS_H_QDCNT2 = 5,
DNS_H_QDCNT = DNS_H_QDCNT1,
+#define dns_numqd(pkt) dns_get16((pkt)+4)
+ /* bytes 6:7: ancount, numanswers */
DNS_H_ANCNT1 = 6,
DNS_H_ANCNT2 = 7,
DNS_H_ANCNT = DNS_H_ANCNT1,
+#define dns_numan(pkt) dns_get16((pkt)+6)
+ /* bytes 8:9: nscount, numauthority */
DNS_H_NSCNT1 = 8,
DNS_H_NSCNT2 = 9,
DNS_H_NSCNT = DNS_H_NSCNT1,
+#define dns_numns(pkt) dns_get16((pkt)+8)
+ /* bytes 10:11: arcount, numadditional */
DNS_H_ARCNT1 = 10,
DNS_H_ARCNT2 = 11,
DNS_H_ARCNT = DNS_H_ARCNT1,
+#define dns_numar(pkt) dns_get16((pkt)+10)
+#define dns_payload(pkt) ((pkt)+DNS_HSIZE)
/* EDNS0 (OPT RR) flags (Ext. Flags) */
DNS_EF1_DO = 0x80, /* DNSSEC OK */
+/* packet buffer: start at pkt, end before pkte, current pos *curp.
+ * extract a DN and set *curp to the next byte after DN in packet.
+ * return -1 on error, 0 if dnsiz is too small, or dnlen on ok.
+UDNS_API int
+dns_getdn(dnscc_t *pkt, dnscc_t **curp, dnscc_t *end,
dnsc_t *dn, unsigned dnsiz);
+/* skip the DN at position cur in packet ending before pkte,
+ * return pointer to the next byte after the DN or NULL on error */
+UDNS_API dnscc_t *
+dns_skipdn(dnscc_t *end, dnscc_t *cur);
+struct dns_rr {
/* DNS Resource Record */
dnsc_t dnsrr_dn[DNS_MAXDN]; /* the DN of the RR */
enum dns_class dnsrr_ /* Class */
enum dns_type
dnsrr_ /* Type */
unsigned dnsrr_
/* Time-To-Live (TTL) */
unsigned dnsrr_
/* data size */
dnscc_t *dnsrr_
/* pointer to start of data */
dnscc_t *dnsrr_
/* past end of data */
+struct dns_parse { /* RR/packet parsing state */
dnscc_t *dnsp_
/* start of the packet */
dnscc_t *dnsp_
/* end of the packet */
dnscc_t *dnsp_
/* current packet position */
dnscc_t *dnsp_
/* start of answer section */
/* number of RRs left to go */
/* RR count so far */
unsigned dnsp_
/* TTL value so far */
dnscc_t *dnsp_
/* the RR DN we're looking for */
enum dns_class dnsp_ /* RR class we're looking for or 0 */
enum dns_type
dnsp_ /* RR type we're looking for or 0 */
dnsc_t dnsp_dnbuf[DNS_MAXDN]; /* domain buffer */
+/* initialize the parse structure */
+UDNS_API void
+dns_initparse(struct dns_parse *p, dnscc_t *qdn,
dnscc_t *pkt, dnscc_t *cur, dnscc_t *end);
+/* search next RR, &0=error, 0=no more RRs, &0 = found. */
+UDNS_API int
+dns_nextrr(struct dns_parse *p, struct dns_rr *rr);
+UDNS_API void
+dns_rewind(struct dns_parse *p, dnscc_t *qdn);
+/**************************************************************************/
+/**************** Resolver Context ****************************************/
+/* default resolver context */
+UDNS_DATA_API extern struct dns_ctx dns_
+/* reset resolver context to default state, close it if open, drop queries */
+UDNS_API void
+dns_reset(struct dns_ctx *ctx);
+/* reset resolver context and read in system configuration */
+UDNS_API int
+dns_init(struct dns_ctx *ctx, int do_open);
+/* return new resolver context with the same settings as copy */
+UDNS_API struct dns_ctx *
+dns_new(const struct dns_ctx *copy);
+/* free resolver context returned by dns_new(); all queries are dropped */
+UDNS_API void
+dns_free(struct dns_ctx *ctx);
+/* add nameserver for a resolver context (or reset nslist if serv==NULL) */
+UDNS_API int
+dns_add_serv(struct dns_ctx *ctx, const char *serv);
+/* add nameserver using struct sockaddr structure (with ports) */
+UDNS_API int
+dns_add_serv_s(struct dns_ctx *ctx, const struct sockaddr *sa);
+/* add search list element for a resolver context (or reset it if srch==NULL) */
+UDNS_API int
+dns_add_srch(struct dns_ctx *ctx, const char *srch);
+/* set options for a resolver context */
+UDNS_API int
+dns_set_opts(struct dns_ctx *ctx, const char *opts);
+enum dns_opt {
/* options */
DNS_OPT_FLAGS, /* flags, DNS_F_XXX */
DNS_OPT_TIMEOUT, /* timeout in secounds */
DNS_OPT_NTRIES, /* number of retries */
DNS_OPT_NDOTS, /* ndots */
DNS_OPT_UDPSIZE, /* EDNS0 UDP size */
DNS_OPT_PORT,
/* port to use */
+/* set or get (if val&0) an option */
+UDNS_API int
+dns_set_opt(struct dns_ctx *ctx, enum dns_opt opt, int val);
+enum dns_flags {
DNS_NOSRCH = 0x, /* do not perform search */
DNS_NORD = 0x, /* request no recursion */
DNS_AAONLY = 0x, /* set AA flag in queries */
DNS_SET_DO = 0x, /* set EDNS0 &DO& bit (DNSSEC OK) */
DNS_SET_CD = 0x, /* set CD bit (DNSSEC: checking disabled) */
+/* set the debug function pointer */
+typedef void
+(dns_dbgfn)(int code, const struct sockaddr *sa, unsigned salen,
dnscc_t *pkt, int plen,
const struct dns_query *q, void *data);
+UDNS_API void
+dns_set_dbgfn(struct dns_ctx *ctx, dns_dbgfn *dbgfn);
+/* open and return UDP socket */
+UDNS_API int
+dns_open(struct dns_ctx *ctx);
+/* return UDP socket or -1 if not open */
+UDNS_API int
+dns_sock(const struct dns_ctx *ctx);
+/* close the UDP socket */
+UDNS_API void
+dns_close(struct dns_ctx *ctx);
+/* return number of requests queued */
+UDNS_API int
+dns_active(const struct dns_ctx *ctx);
+/* return status of the last operation */
+UDNS_API int
+dns_status(const struct dns_ctx *ctx);
+UDNS_API void
+dns_setstatus(struct dns_ctx *ctx, int status);
+/* handle I/O event on UDP socket */
+UDNS_API void
+dns_ioevent(struct dns_ctx *ctx, time_t now);
+/* process any timeouts, return time in secounds to the
+ * next timeout (or -1 if none) but not greather than maxwait */
+UDNS_API int
+dns_timeouts(struct dns_ctx *ctx, int maxwait, time_t now);
+/* define timer requesting routine to use */
+typedef void dns_utm_fn(struct dns_ctx *ctx, int timeout, void *data);
+UDNS_API void
+dns_set_tmcbck(struct dns_ctx *ctx, dns_utm_fn *fn, void *data);
+/**************************************************************************/
+/**************** Making Queries ******************************************/
+/* query callback routine */
+typedef void dns_query_fn(struct dns_ctx *ctx, void *result, void *data);
+/* query parse routine: raw DNS =& application structure */
+typedef int
+dns_parse_fn(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **res);
+enum dns_status {
DNS_E_NOERROR
= 0, /* ok, not an error */
DNS_E_TEMPFAIL = -1, /* timeout, SERVFAIL or similar */
DNS_E_PROTOCOL = -2, /* got garbled reply */
DNS_E_NXDOMAIN = -3, /* domain does not exists */
DNS_E_NODATA
= -4, /* domain exists but no data of reqd type */
DNS_E_NOMEM
= -5, /* out of memory while processing */
DNS_E_BADQUERY = -6 /* the query is malformed */
+/* submit generic DN query */
+UDNS_API struct dns_query *
+dns_submit_dn(struct dns_ctx *ctx,
dnscc_t *dn, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
+/* submit generic name query */
+UDNS_API struct dns_query *
+dns_submit_p(struct dns_ctx *ctx,
const char *name, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
+/* cancel the given async query in progress */
+UDNS_API int
+dns_cancel(struct dns_ctx *ctx, struct dns_query *q);
+/* resolve a generic query, return the answer */
+UDNS_API void *
+dns_resolve_dn(struct dns_ctx *ctx,
dnscc_t *qdn, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
+UDNS_API void *
+dns_resolve_p(struct dns_ctx *ctx,
const char *qname, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
+UDNS_API void *
+dns_resolve(struct dns_ctx *ctx, struct dns_query *q);
+/* Specific RR handlers */
+#define dns_rr_common(prefix)
char *prefix##_
/* canonical name */
char *prefix##_
/* original query name */
unsigned prefix##_ /* TTL value */
int prefix##_nrr
/* number of records */
+struct dns_rr_null {
/* NULL RRset, aka RRset template */
dns_rr_common(dnsn);
+UDNS_API int
+dns_stdrr_size(const struct dns_parse *p);
+UDNS_API void *
+dns_stdrr_finish(struct dns_rr_null *ret, char *cp, const struct dns_parse *p);
+struct dns_rr_a4 {
/* the A RRset */
dns_rr_common(dnsa4);
struct in_addr *dnsa4_ /* array of addresses, naddr elements */
+UDNS_API dns_parse_fn dns_parse_a4; /* A RR parsing routine */
+typedef void
/* A query callback routine */
+dns_query_a4_fn(struct dns_ctx *ctx, struct dns_rr_a4 *result, void *data);
+/* submit A IN query */
+UDNS_API struct dns_query *
+dns_submit_a4(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a4_fn *cbck, void *data);
+/* resolve A IN query */
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a4(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_rr_a6 {
/* the AAAA RRset */
dns_rr_common(dnsa6);
struct in6_addr *dnsa6_ /* array of addresses, naddr elements */
+UDNS_API dns_parse_fn dns_parse_a6; /* A RR parsing routine */
+typedef void
/* A query callback routine */
+dns_query_a6_fn(struct dns_ctx *ctx, struct dns_rr_a6 *result, void *data);
+/* submit AAAA IN query */
+UDNS_API struct dns_query *
+dns_submit_a6(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a6_fn *cbck, void *data);
+/* resolve AAAA IN query */
+UDNS_API struct dns_rr_a6 *
+dns_resolve_a6(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_rr_ptr {
/* the PTR RRset */
dns_rr_common(dnsptr);
char **dnsptr_
/* array of PTRs */
+UDNS_API dns_parse_fn dns_parse_ /* PTR RR parsing routine */
+typedef void
/* PTR query callback */
+dns_query_ptr_fn(struct dns_ctx *ctx, struct dns_rr_ptr *result, void *data);
+/* submit PTR IN in-addr.arpa query */
+UDNS_API struct dns_query *
+dns_submit_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr,
dns_query_ptr_fn *cbck, void *data);
+/* resolve PTR IN in-addr.arpa query */
+UDNS_API struct dns_rr_ptr *
+dns_resolve_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr);
+/* the same as above, but for ip6.arpa */
+UDNS_API struct dns_query *
+dns_submit_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr,
dns_query_ptr_fn *cbck, void *data);
+UDNS_API struct dns_rr_ptr *
+dns_resolve_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr);
+struct dns_mx {
/* single MX RR */
/* MX priority */
/* MX name */
+struct dns_rr_mx {
/* the MX RRset */
dns_rr_common(dnsmx);
struct dns_mx *dnsmx_ /* array of MXes */
+UDNS_API dns_parse_fn dns_parse_ /* MX RR parsing routine */
+typedef void
/* MX RR callback */
+dns_query_mx_fn(struct dns_ctx *ctx, struct dns_rr_mx *result, void *data);
+/* submit MX IN query */
+UDNS_API struct dns_query *
+dns_submit_mx(struct dns_ctx *ctx, const char *name, int flags,
dns_query_mx_fn *cbck, void *data);
+/* resolve MX IN query */
+UDNS_API struct dns_rr_mx *
+dns_resolve_mx(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_txt { /* single TXT record */
/* length of the text */
dnsc_t * /* pointer to text buffer. May contain nulls. */
+struct dns_rr_txt {
/* the TXT RRset */
dns_rr_common(dnstxt);
struct dns_txt *dnstxt_ /* array of TXT records */
+UDNS_API dns_parse_fn dns_parse_ /* TXT RR parsing routine */
+typedef void
/* TXT RR callback */
+dns_query_txt_fn(struct dns_ctx *ctx, struct dns_rr_txt *result, void *data);
+/* submit TXT query */
+UDNS_API struct dns_query *
+dns_submit_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags,
dns_query_txt_fn *cbck, void *data);
+/* resolve TXT query */
+UDNS_API struct dns_rr_txt *
+dns_resolve_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags);
+struct dns_srv { /* single SRV RR */
/* SRV priority */
/* SRV weight */
/* SRV port */
/* SRV name */
+struct dns_rr_srv {
/* the SRV RRset */
dns_rr_common(dnssrv);
struct dns_srv *dnssrv_ /* array of SRVes */
+UDNS_API dns_parse_fn dns_parse_ /* SRV RR parsing routine */
+typedef void
/* SRV RR callback */
+dns_query_srv_fn(struct dns_ctx *ctx, struct dns_rr_srv *result, void *data);
+/* submit SRV IN query */
+UDNS_API struct dns_query *
+dns_submit_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags, dns_query_srv_fn *cbck, void *data);
+/* resolve SRV IN query */
+UDNS_API struct dns_rr_srv *
+dns_resolve_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags);
+/* NAPTR (RFC3403) RR type */
+struct dns_naptr { /* single NAPTR RR */
/* NAPTR order */
+ /* NAPTR preference */
/* NAPTR flags */
char * /* NAPTR service */
/* NAPTR regexp */
char * /* NAPTR replacement */
+struct dns_rr_naptr {
/* the NAPTR RRset */
dns_rr_common(dnsnaptr);
struct dns_naptr *dnsnaptr_ /* array of NAPTRes */
+UDNS_API dns_parse_fn dns_parse_ /* NAPTR RR parsing routine */
+typedef void
/* NAPTR RR callback */
+dns_query_naptr_fn(struct dns_ctx *ctx,
struct dns_rr_naptr *result, void *data);
+/* submit NAPTR IN query */
+UDNS_API struct dns_query *
+dns_submit_naptr(struct dns_ctx *ctx, const char *name, int flags,
dns_query_naptr_fn *cbck, void *data);
+/* resolve NAPTR IN query */
+UDNS_API struct dns_rr_naptr *
+dns_resolve_naptr(struct dns_ctx *ctx, const char *name, int flags);
+UDNS_API struct dns_query *
+dns_submit_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
+UDNS_API struct dns_query *
+dns_submit_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
+UDNS_API struct dns_query *
+dns_submit_rhsbl(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_rhsbl_txt(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_rhsbl(struct dns_ctx *ctx, const char *name, const char *rhsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_rhsbl_txt(struct dns_ctx *ctx, const char *name, const char *rhsbl);
+/**************************************************************************/
+/**************** Names, Names ********************************************/
+struct dns_nameval {
const char *
+UDNS_DATA_API extern const struct dns_nameval dns_classtab[];
+UDNS_DATA_API extern const struct dns_nameval dns_typetab[];
+UDNS_DATA_API extern const struct dns_nameval dns_rcodetab[];
+UDNS_API int
+dns_findname(const struct dns_nameval *nv, const char *name);
+#define dns_findclassname(cls) dns_findname(dns_classtab, (cls))
+#define dns_findtypename(type) dns_findname(dns_typetab, (type))
+#define dns_findrcodename(rcode) dns_findname(dns_rcodetab, (rcode))
+UDNS_API const char *dns_classname(enum dns_class cls);
+UDNS_API const char *dns_typename(enum dns_type type);
+UDNS_API const char *dns_rcodename(enum dns_rcode rcode);
+const char *_dns_format_code(char *buf, const char *prefix, int code);
+UDNS_API const char *dns_strerror(int errnum);
+/* simple pseudo-random number generator, code by Bob Jenkins */
+struct udns_jranctx { /* the context */
unsigned a, b, c,
+/* initialize the RNG with a given seed */
+UDNS_API void
+udns_jraninit(struct udns_jranctx *x, unsigned seed);
+/* return next random number.
32bits on most platforms so far. */
+UDNS_API unsigned
+udns_jranval(struct udns_jranctx *x);
+#ifdef __cplusplus
+} /* extern &C& */
+#endif /* include guard */
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1.主机[A]记录描述: 主机地址记录。在 DNS 域名与 IP 地址之间建立映射关系语法: owner class ttl A IP_v4_address 例子: host1.. IN A 127.0.0.12.别名[CNAME]描述: 用来表示用在该区域中的其它资源记录类型中已指定名称的替补或别名 DNS 域名。语法: owner ttl class AFSDB subtype server_host_name 例子: aliasname.. AFSDB 1 truename..3.主机信息[HINFO]描述: 用来说明映射到特定 DNS 主机名的 CPU 类型和操作系统类型的 RFC-1700 保留字符串类型，这个信息可以被应用程序通信协议使用。语法: owner ttl class HINFO cpu_type os_type 例子: my-computer-name.. HINFO INTEL-386 WIN324.邮箱[MB]描述: 用来将指定的域邮箱名映射到这个邮箱的主机的当前区域中的主机地址记录语法: owner ttl class MB mailbox_hostname 例子: mailbox.. MB mailhost1.5.邮箱或通信信息 MINFO描述: 用来指定负责维护该记录中特定通信名单或邮箱的联系域邮箱名称。同时，还被用来指定接收与该记录中特定通信名单或邮箱有关的错误信息的邮箱语法: owner ttl class MINFO responsible_mailbox error_mailbox 例子: administrator.. MINFO resp-mbox. err-mbox.6.邮件交换器 [MX]描述: 用来向特定邮件交换器提供消息路由，该主机作为指定 DNS 域名的邮件交换器。MX 记录需要一个16-位整数来表示消息路由中的主机优先级，多个邮件交换在消息一中被指定。对于这个记录类型中的每个邮件交换主机，需要一个相应的主机地址类型记录。语法: owner ttl class MX preference mail_exchanger_host 例子: . MX 10 mailserver1.7.指针记录 [PTR]描述:用来指向域名空间中的某个位置。PTR记录通常在特殊域中来执行地址到名称镜像的反向搜索。每个记录提供要指向域名称空间的某个其它位置的简单数据。 Syntax: owner ttl class PTR targeted_domain_name 例子: 1.0.0.10.in-addr.arpa. PTR host..8.服务记录 [SRV]描述: SRV 资源记录允许管理员使用单一 DNS 域的多个服务器，容易的用管理功能将 TCP/IP 服务从一个主机移到另一个主机，并且将服务提供的程序主机分派为服务的主服务器，将其它的分派为辅助的语法: service.protocol.name ttl class SRV preference weight port target 例子: ldap.tcp.ms-dcs SRV 0 0 389 dc1. SRV 10 0 389 dc2.9.已知服务记录 [WKS]描述: 用来描述一个特定 IP 地址上特定通讯协议支持的 TCP/IP 服务，它提供 TCP 和 UDP 可使用性信息。如果服务器同时支持 TCP 和 UDP 的已知服务，或者有多个支持服务的 IP 地址，多个 WKS 记录会被使用语法: owner ttl class WKS address protocol service_list 例子: . WKS 10.0.0.1 TCP ( telnet smtp ftp ) 在"起始颁发机构" SOA 中，记录了这个 Zone 中 DNS 服务器是那一台主机，也记录着负责本 zone 的管理员的邮件地址，如果以后在安装邮件服务器需要修改该信息时，注意将邮件地址中的 "@" 符改为句点 "." ，因为 "@" 是保留字，代表 zone；另外，要使用域完整名称 FQDN，不要漏掉最后的句点。可以通过 "zone→属性→起始颁发机构"对管理员邮件地址进行修改。
配色/在线汉字/ sss-libev
项目语言:C
权限:read-only(如需更高权限请先加入项目)
sss-libev/
Index: udns.h
===================================================================
--- udns.h (revision 0)
+++ udns.h (revision 2)
@@ -0,0 +1,778 @@
+/* udns.h
header file for the UDNS library.
Copyright (C) 2005
Michael Tokarev &mjt@corpit.ru&
This file is part of UDNS library, an async DNS stub resolver.
This libr you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software F either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library, in file named COPYING.LGPL; if not,
write to the Free Software Foundation, Inc., 59 Temple Place,
Suite 330, Boston, MA
+#ifndef UDNS_VERSION /* include guard */
+#define UDNS_VERSION &0.4&
+#ifdef __MINGW32__
+# ifdef UDNS_DYNAMIC_LIBRARY
ifdef DNS_LIBRARY_BUILD
define UDNS_API __declspec(dllexport)
define UDNS_DATA_API __declspec(dllexport)
define UDNS_API __declspec(dllimport)
define UDNS_DATA_API __declspec(dllimport)
+#ifndef UDNS_API
+# define UDNS_API
+#ifndef UDNS_DATA_API
+# define UDNS_DATA_API
+#include &sys/types.h&
/* for time_t */
+#ifdef __cplusplus
+extern &C& {
+/* forward declarations if sockets stuff isn't #include'd */
+struct in_
+struct in6_
+/**************************************************************************/
+/**************** Common definitions **************************************/
+UDNS_API const char *
+dns_version(void);
+struct dns_
+struct dns_
+/* shorthand for [const] unsigned char */
+typedef unsigned char dnsc_t;
+typedef const unsigned char dnscc_t;
+#define DNS_MAXDN 255 /* max DN length */
+#define DNS_DNPAD 1 /* padding for DN buffers */
+#define DNS_MAXLABEL 63 /* max DN label length */
+#define DNS_MAXNAME 1024 /* max asciiz domain name length */
+#define DNS_HSIZE 12 /* DNS packet header size */
+#define DNS_PORT 53 /* default domain port */
+#define DNS_MAXSERV 6 /* max servers to consult */
+#define DNS_MAXPACKET 512 /* max traditional-DNS UDP packet size */
+#define DNS_EDNS0PACKET 4096 /* EDNS0 packet size to use */
+enum dns_class { /* DNS RR Classes */
DNS_C_INVALID = 0, /* invalid class */
DNS_C_IN = 1, /* Internet */
DNS_C_CH = 3, /* CHAOS */
DNS_C_HS = 4, /* HESIOD */
DNS_C_ANY = 255 /* wildcard */
+enum dns_type {
/* DNS RR Types */
DNS_T_INVALID
= 0, /* Cookie. */
= 1, /* Host address. */
= 2, /* Authoritative server. */
= 3, /* Mail destination. */
= 4, /* Mail forwarder. */
DNS_T_CNAME
= 5, /* Canonical name. */
= 6, /* Start of authority zone. */
= 7, /* Mailbox domain name. */
= 8, /* Mail group member. */
= 9, /* Mail rename name. */
DNS_T_NULL
= 10, /* Null resource record. */
= 11, /* Well known service. */
= 12, /* Domain name pointer. */
DNS_T_HINFO
= 13, /* Host information. */
DNS_T_MINFO
= 14, /* Mailbox information. */
= 15, /* Mail routing information. */
= 16, /* Text strings. */
= 17, /* Responsible person. */
DNS_T_AFSDB
= 18, /* AFS cell database. */
= 19, /* X_25 calling address. */
DNS_T_ISDN
= 20, /* ISDN calling address. */
= 21, /* Router. */
DNS_T_NSAP
= 22, /* NSAP address. */
DNS_T_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
= 24, /* Security signature. */
= 25, /* Security key. */
= 26, /* X.400 mail mapping. */
DNS_T_GPOS
= 27, /* Geographical position (withdrawn). */
DNS_T_AAAA
= 28, /* Ip6 Address. */
= 29, /* Location Information. */
= 30, /* Next domain (security). */
= 31, /* Endpoint identifier. */
DNS_T_NIMLOC
= 32, /* Nimrod Locator. */
= 33, /* Server Selection. */
DNS_T_ATMA
= 34, /* ATM Address */
DNS_T_NAPTR
= 35, /* Naming Authority PoinTeR */
= 36, /* Key Exchange */
DNS_T_CERT
= 37, /* Certification record */
= 38, /* IPv6 address (deprecates AAAA) */
DNS_T_DNAME
= 39, /* Non-terminal DNAME (for IPv6) */
DNS_T_SINK
= 40, /* Kitchen sink (experimentatl) */
= 41, /* EDNS0 option (meta-RR) */
= 43, /* DNSSEC */
DNS_T_SSHFP
DNS_T_IPSECKEY = 45,
DNS_T_RRSIG
= 46, /* DNSSEC */
DNS_T_NSEC
= 47, /* DNSSEC */
DNS_T_DNSKEY
DNS_T_DHCID
DNS_T_NSEC3
DNS_T_NSEC3PARAMS = 51,
DNS_T_TALINK
= 58, /* draft-ietf-dnsop-trust-history */
DNS_T_UINFO
DNS_T_UNSPEC
DNS_T_TSIG
= 250, /* Transaction signature. */
DNS_T_IXFR
= 251, /* Incremental zone transfer. */
DNS_T_AXFR
= 252, /* Transfer zone of authority. */
DNS_T_MAILB
= 253, /* Transfer mailbox records. */
DNS_T_MAILA
= 254, /* Transfer mail agent records. */
= 255, /* Wildcard match. */
DNS_T_ZXFR
= 256, /* BIND-specific, nonstandard. */
= 32769, /* RFC , DNSSEC Lookaside Validation */
+/**************************************************************************/
+/**************** Domain Names (DNs) **************************************/
+/* return length of the DN */
+UDNS_API unsigned
+dns_dnlen(dnscc_t *dn);
+/* return #of labels in a DN */
+UDNS_API unsigned
+dns_dnlabels(dnscc_t *dn);
+/* lower- and uppercase single DN char */
+#define DNS_DNLC(c) ((c) &= 'A' && (c) &= 'Z' ? (c) - 'A' + 'a' : (c))
+#define DNS_DNUC(c) ((c) &= 'a' && (c) &= 'z' ? (c) - 'a' + 'A' : (c))
+/* compare the DNs, return dnlen of equal or 0 if not */
+UDNS_API unsigned
+dns_dnequal(dnscc_t *dn1, dnscc_t *dn2);
+/* copy one DN to another, size checking */
+UDNS_API unsigned
+dns_dntodn(dnscc_t *sdn, dnsc_t *ddn, unsigned ddnsiz);
+/* convert asciiz string of length namelen (0 to use strlen) to DN */
+UDNS_API int
+dns_ptodn(const char *name, unsigned namelen,
dnsc_t *dn, unsigned dnsiz, int *isabs);
+/* simpler form of dns_ptodn() */
+#define dns_sptodn(name,dn,dnsiz) dns_ptodn((name),0,(dn),(dnsiz),0)
+UDNS_DATA_API extern dnscc_t dns_inaddr_arpa_dn[14];
+#define DNS_A4RSIZE 30
+UDNS_API int
+dns_a4todn(const struct in_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API int
+dns_a4ptodn(const struct in_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API dnsc_t *
+dns_a4todn_(const struct in_addr *addr, dnsc_t *dn, dnsc_t *dne);
+UDNS_DATA_API extern dnscc_t dns_ip6_arpa_dn[10];
+#define DNS_A6RSIZE 74
+UDNS_API int
+dns_a6todn(const struct in6_addr *addr, dnscc_t *tdn,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API int
+dns_a6ptodn(const struct in6_addr *addr, const char *tname,
dnsc_t *dn, unsigned dnsiz);
+UDNS_API dnsc_t *
+dns_a6todn_(const struct in6_addr *addr, dnsc_t *dn, dnsc_t *dne);
+/* convert DN into asciiz string */
+UDNS_API int
+dns_dntop(dnscc_t *dn, char *name, unsigned namesiz);
+/* convert DN into asciiz string, using static buffer (NOT thread-safe!) */
+UDNS_API const char *
+dns_dntosp(dnscc_t *dn);
+/* return buffer size (incl. null byte) required for asciiz form of a DN */
+UDNS_API unsigned
+dns_dntop_size(dnscc_t *dn);
+/* either wrappers or reimplementations for inet_ntop() and inet_pton() */
+UDNS_API const char *dns_ntop(int af, const void *src, char *dst, int size);
+UDNS_API int dns_pton(int af, const char *src, void *dst);
+/**************************************************************************/
+/**************** DNS raw packet layout ***********************************/
+enum dns_rcode { /* reply codes */
DNS_R_NOERROR
= 0, /* ok, no error */
DNS_R_FORMERR
= 1, /* format error */
DNS_R_SERVFAIL = 2, /* server failed */
DNS_R_NXDOMAIN = 3, /* domain does not exists */
DNS_R_NOTIMPL
= 4, /* not implemented */
DNS_R_REFUSED
= 5, /* query refused */
/* these are for BIND_UPDATE */
DNS_R_YXDOMAIN = 6, /* Name exists */
DNS_R_YXRRSET
= 7, /* RRset exists */
DNS_R_NXRRSET
= 8, /* RRset does not exist */
DNS_R_NOTAUTH
= 9, /* Not authoritative for zone */
DNS_R_NOTZONE
= 10, /* Zone of record different from zone section */
/*ns_r_max = 11,*/
/* The following are TSIG extended errors */
DNS_R_BADSIG
DNS_R_BADKEY
DNS_R_BADTIME
+static __inline unsigned dns_get16(dnscc_t *s) {
return ((unsigned)s[0]&&8) | s[1];
+static __inline unsigned dns_get32(dnscc_t *s) {
return ((unsigned)s[0]&&24) | ((unsigned)s[1]&&16)
| ((unsigned)s[2]&&8) | s[3];
+static __inline dnsc_t *dns_put16(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n && 8) & 255); *d++ = (dnsc_t)(n & 255);
+static __inline dnsc_t *dns_put32(dnsc_t *d, unsigned n) {
*d++ = (dnsc_t)((n && 24) & 255); *d++ = (dnsc_t)((n && 16) & 255);
*d++ = (dnsc_t)((n &&
8) & 255); *d++ = (dnsc_t)(n & 255);
+/* DNS Header layout */
+ /* bytes 0:1 - query ID */
DNS_H_QID1 = 0,
DNS_H_QID2 = 1,
DNS_H_QID = DNS_H_QID1,
+#define dns_qid(pkt) dns_get16((pkt)+DNS_H_QID)
+ /* byte 2: flags1 */
DNS_H_F1 = 2,
DNS_HF1_QR = 0x80, /* query response flag */
+#define dns_qr(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_QR)
DNS_HF1_OPCODE = 0x78, /* opcode, 0 = query */
+#define dns_opcode(pkt) (((pkt)[DNS_H_F1]&DNS_HF1_OPCODE)&&3)
DNS_HF1_AA = 0x04, /* auth answer */
+#define dns_aa(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_AA)
DNS_HF1_TC = 0x02, /* truncation flag */
+#define dns_tc(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_TC)
DNS_HF1_RD = 0x01, /* recursion desired (may be set in query) */
+#define dns_rd(pkt) ((pkt)[DNS_H_F1]&DNS_HF1_RD)
+ /* byte 3: flags2 */
DNS_H_F2 = 3,
DNS_HF2_RA = 0x80, /* recursion available */
+#define dns_ra(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RA)
DNS_HF2_Z = 0x40, /* reserved */
DNS_HF2_AD = 0x20, /* DNSSEC: authentic data */
+#define dns_ad(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_AD)
DNS_HF2_CD = 0x10, /* DNSSEC: checking disabled */
+#define dns_cd(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_CD)
DNS_HF2_RCODE = 0x0f, /* response code, DNS_R_XXX above */
+#define dns_rcode(pkt) ((pkt)[DNS_H_F2]&DNS_HF2_RCODE)
+ /* bytes 4:5: qdcount, numqueries */
DNS_H_QDCNT1 = 4,
DNS_H_QDCNT2 = 5,
DNS_H_QDCNT = DNS_H_QDCNT1,
+#define dns_numqd(pkt) dns_get16((pkt)+4)
+ /* bytes 6:7: ancount, numanswers */
DNS_H_ANCNT1 = 6,
DNS_H_ANCNT2 = 7,
DNS_H_ANCNT = DNS_H_ANCNT1,
+#define dns_numan(pkt) dns_get16((pkt)+6)
+ /* bytes 8:9: nscount, numauthority */
DNS_H_NSCNT1 = 8,
DNS_H_NSCNT2 = 9,
DNS_H_NSCNT = DNS_H_NSCNT1,
+#define dns_numns(pkt) dns_get16((pkt)+8)
+ /* bytes 10:11: arcount, numadditional */
DNS_H_ARCNT1 = 10,
DNS_H_ARCNT2 = 11,
DNS_H_ARCNT = DNS_H_ARCNT1,
+#define dns_numar(pkt) dns_get16((pkt)+10)
+#define dns_payload(pkt) ((pkt)+DNS_HSIZE)
/* EDNS0 (OPT RR) flags (Ext. Flags) */
DNS_EF1_DO = 0x80, /* DNSSEC OK */
+/* packet buffer: start at pkt, end before pkte, current pos *curp.
+ * extract a DN and set *curp to the next byte after DN in packet.
+ * return -1 on error, 0 if dnsiz is too small, or dnlen on ok.
+UDNS_API int
+dns_getdn(dnscc_t *pkt, dnscc_t **curp, dnscc_t *end,
dnsc_t *dn, unsigned dnsiz);
+/* skip the DN at position cur in packet ending before pkte,
+ * return pointer to the next byte after the DN or NULL on error */
+UDNS_API dnscc_t *
+dns_skipdn(dnscc_t *end, dnscc_t *cur);
+struct dns_rr {
/* DNS Resource Record */
dnsc_t dnsrr_dn[DNS_MAXDN]; /* the DN of the RR */
enum dns_class dnsrr_ /* Class */
enum dns_type
dnsrr_ /* Type */
unsigned dnsrr_
/* Time-To-Live (TTL) */
unsigned dnsrr_
/* data size */
dnscc_t *dnsrr_
/* pointer to start of data */
dnscc_t *dnsrr_
/* past end of data */
+struct dns_parse { /* RR/packet parsing state */
dnscc_t *dnsp_
/* start of the packet */
dnscc_t *dnsp_
/* end of the packet */
dnscc_t *dnsp_
/* current packet position */
dnscc_t *dnsp_
/* start of answer section */
/* number of RRs left to go */
/* RR count so far */
unsigned dnsp_
/* TTL value so far */
dnscc_t *dnsp_
/* the RR DN we're looking for */
enum dns_class dnsp_ /* RR class we're looking for or 0 */
enum dns_type
dnsp_ /* RR type we're looking for or 0 */
dnsc_t dnsp_dnbuf[DNS_MAXDN]; /* domain buffer */
+/* initialize the parse structure */
+UDNS_API void
+dns_initparse(struct dns_parse *p, dnscc_t *qdn,
dnscc_t *pkt, dnscc_t *cur, dnscc_t *end);
+/* search next RR, &0=error, 0=no more RRs, &0 = found. */
+UDNS_API int
+dns_nextrr(struct dns_parse *p, struct dns_rr *rr);
+UDNS_API void
+dns_rewind(struct dns_parse *p, dnscc_t *qdn);
+/**************************************************************************/
+/**************** Resolver Context ****************************************/
+/* default resolver context */
+UDNS_DATA_API extern struct dns_ctx dns_
+/* reset resolver context to default state, close it if open, drop queries */
+UDNS_API void
+dns_reset(struct dns_ctx *ctx);
+/* reset resolver context and read in system configuration */
+UDNS_API int
+dns_init(struct dns_ctx *ctx, int do_open);
+/* return new resolver context with the same settings as copy */
+UDNS_API struct dns_ctx *
+dns_new(const struct dns_ctx *copy);
+/* free resolver context returned by dns_new(); all queries are dropped */
+UDNS_API void
+dns_free(struct dns_ctx *ctx);
+/* add nameserver for a resolver context (or reset nslist if serv==NULL) */
+UDNS_API int
+dns_add_serv(struct dns_ctx *ctx, const char *serv);
+/* add nameserver using struct sockaddr structure (with ports) */
+UDNS_API int
+dns_add_serv_s(struct dns_ctx *ctx, const struct sockaddr *sa);
+/* add search list element for a resolver context (or reset it if srch==NULL) */
+UDNS_API int
+dns_add_srch(struct dns_ctx *ctx, const char *srch);
+/* set options for a resolver context */
+UDNS_API int
+dns_set_opts(struct dns_ctx *ctx, const char *opts);
+enum dns_opt {
/* options */
DNS_OPT_FLAGS, /* flags, DNS_F_XXX */
DNS_OPT_TIMEOUT, /* timeout in secounds */
DNS_OPT_NTRIES, /* number of retries */
DNS_OPT_NDOTS, /* ndots */
DNS_OPT_UDPSIZE, /* EDNS0 UDP size */
DNS_OPT_PORT,
/* port to use */
+/* set or get (if val&0) an option */
+UDNS_API int
+dns_set_opt(struct dns_ctx *ctx, enum dns_opt opt, int val);
+enum dns_flags {
DNS_NOSRCH = 0x, /* do not perform search */
DNS_NORD = 0x, /* request no recursion */
DNS_AAONLY = 0x, /* set AA flag in queries */
DNS_SET_DO = 0x, /* set EDNS0 &DO& bit (DNSSEC OK) */
DNS_SET_CD = 0x, /* set CD bit (DNSSEC: checking disabled) */
+/* set the debug function pointer */
+typedef void
+(dns_dbgfn)(int code, const struct sockaddr *sa, unsigned salen,
dnscc_t *pkt, int plen,
const struct dns_query *q, void *data);
+UDNS_API void
+dns_set_dbgfn(struct dns_ctx *ctx, dns_dbgfn *dbgfn);
+/* open and return UDP socket */
+UDNS_API int
+dns_open(struct dns_ctx *ctx);
+/* return UDP socket or -1 if not open */
+UDNS_API int
+dns_sock(const struct dns_ctx *ctx);
+/* close the UDP socket */
+UDNS_API void
+dns_close(struct dns_ctx *ctx);
+/* return number of requests queued */
+UDNS_API int
+dns_active(const struct dns_ctx *ctx);
+/* return status of the last operation */
+UDNS_API int
+dns_status(const struct dns_ctx *ctx);
+UDNS_API void
+dns_setstatus(struct dns_ctx *ctx, int status);
+/* handle I/O event on UDP socket */
+UDNS_API void
+dns_ioevent(struct dns_ctx *ctx, time_t now);
+/* process any timeouts, return time in secounds to the
+ * next timeout (or -1 if none) but not greather than maxwait */
+UDNS_API int
+dns_timeouts(struct dns_ctx *ctx, int maxwait, time_t now);
+/* define timer requesting routine to use */
+typedef void dns_utm_fn(struct dns_ctx *ctx, int timeout, void *data);
+UDNS_API void
+dns_set_tmcbck(struct dns_ctx *ctx, dns_utm_fn *fn, void *data);
+/**************************************************************************/
+/**************** Making Queries ******************************************/
+/* query callback routine */
+typedef void dns_query_fn(struct dns_ctx *ctx, void *result, void *data);
+/* query parse routine: raw DNS =& application structure */
+typedef int
+dns_parse_fn(dnscc_t *qdn, dnscc_t *pkt, dnscc_t *cur, dnscc_t *end,
void **res);
+enum dns_status {
DNS_E_NOERROR
= 0, /* ok, not an error */
DNS_E_TEMPFAIL = -1, /* timeout, SERVFAIL or similar */
DNS_E_PROTOCOL = -2, /* got garbled reply */
DNS_E_NXDOMAIN = -3, /* domain does not exists */
DNS_E_NODATA
= -4, /* domain exists but no data of reqd type */
DNS_E_NOMEM
= -5, /* out of memory while processing */
DNS_E_BADQUERY = -6 /* the query is malformed */
+/* submit generic DN query */
+UDNS_API struct dns_query *
+dns_submit_dn(struct dns_ctx *ctx,
dnscc_t *dn, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
+/* submit generic name query */
+UDNS_API struct dns_query *
+dns_submit_p(struct dns_ctx *ctx,
const char *name, int qcls, int qtyp, int flags,
dns_parse_fn *parse, dns_query_fn *cbck, void *data);
+/* cancel the given async query in progress */
+UDNS_API int
+dns_cancel(struct dns_ctx *ctx, struct dns_query *q);
+/* resolve a generic query, return the answer */
+UDNS_API void *
+dns_resolve_dn(struct dns_ctx *ctx,
dnscc_t *qdn, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
+UDNS_API void *
+dns_resolve_p(struct dns_ctx *ctx,
const char *qname, int qcls, int qtyp, int flags,
dns_parse_fn *parse);
+UDNS_API void *
+dns_resolve(struct dns_ctx *ctx, struct dns_query *q);
+/* Specific RR handlers */
+#define dns_rr_common(prefix)
char *prefix##_
/* canonical name */
char *prefix##_
/* original query name */
unsigned prefix##_ /* TTL value */
int prefix##_nrr
/* number of records */
+struct dns_rr_null {
/* NULL RRset, aka RRset template */
dns_rr_common(dnsn);
+UDNS_API int
+dns_stdrr_size(const struct dns_parse *p);
+UDNS_API void *
+dns_stdrr_finish(struct dns_rr_null *ret, char *cp, const struct dns_parse *p);
+struct dns_rr_a4 {
/* the A RRset */
dns_rr_common(dnsa4);
struct in_addr *dnsa4_ /* array of addresses, naddr elements */
+UDNS_API dns_parse_fn dns_parse_a4; /* A RR parsing routine */
+typedef void
/* A query callback routine */
+dns_query_a4_fn(struct dns_ctx *ctx, struct dns_rr_a4 *result, void *data);
+/* submit A IN query */
+UDNS_API struct dns_query *
+dns_submit_a4(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a4_fn *cbck, void *data);
+/* resolve A IN query */
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a4(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_rr_a6 {
/* the AAAA RRset */
dns_rr_common(dnsa6);
struct in6_addr *dnsa6_ /* array of addresses, naddr elements */
+UDNS_API dns_parse_fn dns_parse_a6; /* A RR parsing routine */
+typedef void
/* A query callback routine */
+dns_query_a6_fn(struct dns_ctx *ctx, struct dns_rr_a6 *result, void *data);
+/* submit AAAA IN query */
+UDNS_API struct dns_query *
+dns_submit_a6(struct dns_ctx *ctx, const char *name, int flags,
dns_query_a6_fn *cbck, void *data);
+/* resolve AAAA IN query */
+UDNS_API struct dns_rr_a6 *
+dns_resolve_a6(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_rr_ptr {
/* the PTR RRset */
dns_rr_common(dnsptr);
char **dnsptr_
/* array of PTRs */
+UDNS_API dns_parse_fn dns_parse_ /* PTR RR parsing routine */
+typedef void
/* PTR query callback */
+dns_query_ptr_fn(struct dns_ctx *ctx, struct dns_rr_ptr *result, void *data);
+/* submit PTR IN in-addr.arpa query */
+UDNS_API struct dns_query *
+dns_submit_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr,
dns_query_ptr_fn *cbck, void *data);
+/* resolve PTR IN in-addr.arpa query */
+UDNS_API struct dns_rr_ptr *
+dns_resolve_a4ptr(struct dns_ctx *ctx, const struct in_addr *addr);
+/* the same as above, but for ip6.arpa */
+UDNS_API struct dns_query *
+dns_submit_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr,
dns_query_ptr_fn *cbck, void *data);
+UDNS_API struct dns_rr_ptr *
+dns_resolve_a6ptr(struct dns_ctx *ctx, const struct in6_addr *addr);
+struct dns_mx {
/* single MX RR */
/* MX priority */
/* MX name */
+struct dns_rr_mx {
/* the MX RRset */
dns_rr_common(dnsmx);
struct dns_mx *dnsmx_ /* array of MXes */
+UDNS_API dns_parse_fn dns_parse_ /* MX RR parsing routine */
+typedef void
/* MX RR callback */
+dns_query_mx_fn(struct dns_ctx *ctx, struct dns_rr_mx *result, void *data);
+/* submit MX IN query */
+UDNS_API struct dns_query *
+dns_submit_mx(struct dns_ctx *ctx, const char *name, int flags,
dns_query_mx_fn *cbck, void *data);
+/* resolve MX IN query */
+UDNS_API struct dns_rr_mx *
+dns_resolve_mx(struct dns_ctx *ctx, const char *name, int flags);
+struct dns_txt { /* single TXT record */
/* length of the text */
dnsc_t * /* pointer to text buffer. May contain nulls. */
+struct dns_rr_txt {
/* the TXT RRset */
dns_rr_common(dnstxt);
struct dns_txt *dnstxt_ /* array of TXT records */
+UDNS_API dns_parse_fn dns_parse_ /* TXT RR parsing routine */
+typedef void
/* TXT RR callback */
+dns_query_txt_fn(struct dns_ctx *ctx, struct dns_rr_txt *result, void *data);
+/* submit TXT query */
+UDNS_API struct dns_query *
+dns_submit_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags,
dns_query_txt_fn *cbck, void *data);
+/* resolve TXT query */
+UDNS_API struct dns_rr_txt *
+dns_resolve_txt(struct dns_ctx *ctx, const char *name, int qcls, int flags);
+struct dns_srv { /* single SRV RR */
/* SRV priority */
/* SRV weight */
/* SRV port */
/* SRV name */
+struct dns_rr_srv {
/* the SRV RRset */
dns_rr_common(dnssrv);
struct dns_srv *dnssrv_ /* array of SRVes */
+UDNS_API dns_parse_fn dns_parse_ /* SRV RR parsing routine */
+typedef void
/* SRV RR callback */
+dns_query_srv_fn(struct dns_ctx *ctx, struct dns_rr_srv *result, void *data);
+/* submit SRV IN query */
+UDNS_API struct dns_query *
+dns_submit_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags, dns_query_srv_fn *cbck, void *data);
+/* resolve SRV IN query */
+UDNS_API struct dns_rr_srv *
+dns_resolve_srv(struct dns_ctx *ctx,
const char *name, const char *srv, const char *proto,
int flags);
+/* NAPTR (RFC3403) RR type */
+struct dns_naptr { /* single NAPTR RR */
/* NAPTR order */
+ /* NAPTR preference */
/* NAPTR flags */
char * /* NAPTR service */
/* NAPTR regexp */
char * /* NAPTR replacement */
+struct dns_rr_naptr {
/* the NAPTR RRset */
dns_rr_common(dnsnaptr);
struct dns_naptr *dnsnaptr_ /* array of NAPTRes */
+UDNS_API dns_parse_fn dns_parse_ /* NAPTR RR parsing routine */
+typedef void
/* NAPTR RR callback */
+dns_query_naptr_fn(struct dns_ctx *ctx,
struct dns_rr_naptr *result, void *data);
+/* submit NAPTR IN query */
+UDNS_API struct dns_query *
+dns_submit_naptr(struct dns_ctx *ctx, const char *name, int flags,
dns_query_naptr_fn *cbck, void *data);
+/* resolve NAPTR IN query */
+UDNS_API struct dns_rr_naptr *
+dns_resolve_naptr(struct dns_ctx *ctx, const char *name, int flags);
+UDNS_API struct dns_query *
+dns_submit_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a4dnsbl(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_a4dnsbl_txt(struct dns_ctx *ctx,
const struct in_addr *addr, const char *dnsbl);
+UDNS_API struct dns_query *
+dns_submit_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_a6dnsbl(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_a6dnsbl_txt(struct dns_ctx *ctx,
const struct in6_addr *addr, const char *dnsbl);
+UDNS_API struct dns_query *
+dns_submit_rhsbl(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_a4_fn *cbck, void *data);
+UDNS_API struct dns_query *
+dns_submit_rhsbl_txt(struct dns_ctx *ctx,
const char *name, const char *rhsbl,
dns_query_txt_fn *cbck, void *data);
+UDNS_API struct dns_rr_a4 *
+dns_resolve_rhsbl(struct dns_ctx *ctx, const char *name, const char *rhsbl);
+UDNS_API struct dns_rr_txt *
+dns_resolve_rhsbl_txt(struct dns_ctx *ctx, const char *name, const char *rhsbl);
+/**************************************************************************/
+/**************** Names, Names ********************************************/
+struct dns_nameval {
const char *
+UDNS_DATA_API extern const struct dns_nameval dns_classtab[];
+UDNS_DATA_API extern const struct dns_nameval dns_typetab[];
+UDNS_DATA_API extern const struct dns_nameval dns_rcodetab[];
+UDNS_API int
+dns_findname(const struct dns_nameval *nv, const char *name);
+#define dns_findclassname(cls) dns_findname(dns_classtab, (cls))
+#define dns_findtypename(type) dns_findname(dns_typetab, (type))
+#define dns_findrcodename(rcode) dns_findname(dns_rcodetab, (rcode))
+UDNS_API const char *dns_classname(enum dns_class cls);
+UDNS_API const char *dns_typename(enum dns_type type);
+UDNS_API const char *dns_rcodename(enum dns_rcode rcode);
+const char *_dns_format_code(char *buf, const char *prefix, int code);
+UDNS_API const char *dns_strerror(int errnum);
+/* simple pseudo-random number generator, code by Bob Jenkins */
+struct udns_jranctx { /* the context */
unsigned a, b, c,
+/* initialize the RNG with a given seed */
+UDNS_API void
+udns_jraninit(struct udns_jranctx *x, unsigned seed);
+/* return next random number.
32bits on most platforms so far. */
+UDNS_API unsigned
+udns_jranval(struct udns_jranctx *x);
+#ifdef __cplusplus
+} /* extern &C& */
+#endif /* include guard */
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