162 lines
7.1 KiB
C
162 lines
7.1 KiB
C
/** @file
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* @brief IRC resolver API.
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* @version $Id: res.h 1823 2007-08-09 03:41:18Z entrope $
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*/
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#ifndef INCLUDED_res_h
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#define INCLUDED_res_h
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#ifndef INCLUDED_config_h
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#include "config.h"
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#endif
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#ifndef INCLUDED_sys_types_h
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#include <sys/types.h>
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#define INCLUDED_sys_types_h
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#endif
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#ifndef INCLUDED_sys_socket_h
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#include <sys/socket.h>
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#define INCLUDED_sys_socket_h
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#endif
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#include <netdb.h>
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#ifndef INCLUDED_netinet_in_h
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#include <netinet/in.h>
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#define INCLUDED_netinet_in_h
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#endif
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#ifdef HAVE_STDINT_H
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#ifndef INCLUDED_stdint_h
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#include <stdint.h>
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#define INCLUDED_stdint_h
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#endif
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#endif
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struct Client;
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struct StatDesc;
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/* Here we define some values lifted from nameser.h */
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#define NS_INT16SZ 2 /**< Size of a 16-bit value. */
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#define NS_INT32SZ 4 /**< Size of a 32-bit value. */
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#define NS_CMPRSFLGS 0xc0 /**< Prefix flags that indicate special types */
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#define NS_MAXCDNAME 255 /**< Maximum length of a compressed domain name. */
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#define QUERY 0 /**< Forward (normal) DNS query operation. */
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#define NO_ERRORS 0 /**< No errors processing a query. */
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#define SERVFAIL 2 /**< Server error while processing a query. */
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#define NXDOMAIN 3 /**< Domain name in query does not exist. */
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#define T_A 1 /**< Hostname -> IPv4 query type. */
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#define T_AAAA 28 /**< Hostname -> IPv6 query type. */
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#define T_PTR 12 /**< IP(v4 or v6) -> hostname query type. */
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#define T_CNAME 5 /**< Canonical name resolution query type. */
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#define C_IN 1 /**< Internet query class. */
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#define QFIXEDSZ 4 /**< Length of fixed-size part of query. */
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#define HFIXEDSZ 12 /**< Length of fixed-size DNS header. */
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/** Structure to store an IP address. */
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struct irc_in_addr
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{
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unsigned short in6_16[8]; /**< IPv6 encoded parts, little-endian. */
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};
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/** Structure to store an IP address and port number. */
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struct irc_sockaddr
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{
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struct irc_in_addr addr; /**< IP address. */
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unsigned short port; /**< Port number, host-endian. */
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};
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/** DNS callback function signature. */
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typedef void (*dns_callback_f)(void *vptr, const struct irc_in_addr *addr, const char *h_name);
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/** DNS query and response header. */
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typedef struct
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{
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unsigned id :16; /**< query identification number */
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#ifdef WORDS_BIGENDIAN
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/* fields in third byte */
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unsigned qr: 1; /**< response flag */
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unsigned opcode: 4; /**< purpose of message */
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unsigned aa: 1; /**< authoritive answer */
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unsigned tc: 1; /**< truncated message */
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unsigned rd: 1; /**< recursion desired */
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/* fields in fourth byte */
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unsigned ra: 1; /**< recursion available */
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unsigned unused :1; /**< unused bits (MBZ as of 4.9.3a3) */
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unsigned ad: 1; /**< authentic data from named */
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unsigned cd: 1; /**< checking disabled by resolver */
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unsigned rcode :4; /**< response code */
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#else
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/* fields in third byte */
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unsigned rd :1; /**< recursion desired */
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unsigned tc :1; /**< truncated message */
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unsigned aa :1; /**< authoritive answer */
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unsigned opcode :4; /**< purpose of message */
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unsigned qr :1; /**< response flag */
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/* fields in fourth byte */
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unsigned rcode :4; /**< response code */
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unsigned cd: 1; /**< checking disabled by resolver */
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unsigned ad: 1; /**< authentic data from named */
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unsigned unused :1; /**< unused bits (MBZ as of 4.9.3a3) */
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unsigned ra :1; /**< recursion available */
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#endif
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/* remaining bytes */
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unsigned qdcount :16; /**< number of question entries */
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unsigned ancount :16; /**< number of answer entries */
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unsigned nscount :16; /**< number of authority entries */
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unsigned arcount :16; /**< number of resource entries */
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} HEADER;
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extern void restart_resolver(void);
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extern void clear_nameservers(void);
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extern void add_nameserver(const char *ipaddr);
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extern void add_local_domain(char *hname, size_t size);
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extern size_t cres_mem(struct Client* cptr);
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extern void delete_resolver_queries(const void *vptr);
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extern void report_dns_servers(struct Client *source_p, const struct StatDesc *sd, char *param);
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extern void gethost_byname(const char *name, dns_callback_f callback, void *ctx);
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extern void gethost_byaddr(const struct irc_in_addr *addr, dns_callback_f callback, void *ctx);
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/** Evaluate to non-zero if \a ADDR is an unspecified (all zeros) address. */
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#define irc_in_addr_unspec(ADDR) (((ADDR)->in6_16[0] == 0) \
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&& ((ADDR)->in6_16[1] == 0) \
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&& ((ADDR)->in6_16[2] == 0) \
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&& ((ADDR)->in6_16[3] == 0) \
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&& ((ADDR)->in6_16[4] == 0) \
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&& ((ADDR)->in6_16[6] == 0) \
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&& ((ADDR)->in6_16[7] == 0) \
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&& ((ADDR)->in6_16[5] == 0 \
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|| (ADDR)->in6_16[5] == 65535))
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/** Evaluate to non-zero if \a ADDR is a valid address (not all 0s and not all 1s). */
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#define irc_in_addr_valid(ADDR) (((ADDR)->in6_16[0] && ~(ADDR)->in6_16[0]) \
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|| (ADDR)->in6_16[1] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[2] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[3] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[4] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[5] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[6] != (ADDR)->in6_16[0] \
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|| (ADDR)->in6_16[7] != (ADDR)->in6_16[0])
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/** Evaluate to non-zero if \a ADDR (of type struct irc_in_addr) is an IPv4 address. */
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#define irc_in_addr_is_ipv4(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
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&& !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \
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&& ((!(ADDR)->in6_16[5] && (ADDR)->in6_16[6]) \
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|| (ADDR)->in6_16[5] == 65535))
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/** Evaluate to non-zero if \a A is a different IP than \a B. */
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#define irc_in_addr_cmp(A,B) (irc_in_addr_is_ipv4(A) ? ((A)->in6_16[6] != (B)->in6_16[6] \
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|| (A)->in6_16[7] != (B)->in6_16[7] || !irc_in_addr_is_ipv4(B)) \
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: memcmp((A), (B), sizeof(struct irc_in_addr)))
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/** Evaluate to non-zero if \a ADDR is a loopback address. */
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#define irc_in_addr_is_loopback(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
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&& !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \
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&& ((!(ADDR)->in6_16[5] \
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&& ((!(ADDR)->in6_16[6] && (ADDR)->in6_16[7] == htons(1)) \
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|| (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)) \
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|| (((ADDR)->in6_16[5] == 65535) \
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&& (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)))
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/** Evaluate to non-zero if \a A is the same type of IP address (IPv4 or IPv6) as \a B. */
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#define irc_in_addr_type_cmp(A,B) ((irc_in_addr_is_ipv4(A) && irc_in_addr_is_ipv4(B)) || \
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(!irc_in_addr_is_ipv4(A) && !irc_in_addr_is_ipv4(B)))
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#endif
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