X-Git-Url: http://git.pk910.de/?p=ircu2.10.12-pk.git;a=blobdiff_plain;f=include%2Fres.h;fp=include%2Fres.h;h=0cfbeea5576ec639e6a74bee44c8bd0d00fe2cdc;hp=0000000000000000000000000000000000000000;hb=0400a5a6479398d82526785c18c0df8bc8b92dce;hpb=d17e10da972ce5776c60b4c317267c6abe0e1ead diff --git a/include/res.h b/include/res.h new file mode 100644 index 0000000..0cfbeea --- /dev/null +++ b/include/res.h @@ -0,0 +1,158 @@ +/** @file + * @brief IRC resolver API. + * @version $Id$ + */ + +#ifndef INCLUDED_res_h +#define INCLUDED_res_h + +#ifndef INCLUDED_config_h +#include "config.h" +#endif + +#ifndef INCLUDED_sys_types_h +#include +#define INCLUDED_sys_types_h +#endif + +#ifndef INCLUDED_sys_socket_h +#include +#define INCLUDED_sys_socket_h +#endif + +#include + +#ifndef INCLUDED_netinet_in_h +#include +#define INCLUDED_netinet_in_h +#endif + +#ifdef HAVE_STDINT_H +#ifndef INCLUDED_stdint_h +#include +#define INCLUDED_stdint_h +#endif +#endif + +struct Client; +struct StatDesc; + +/* Here we define some values lifted from nameser.h */ +#define NS_INT16SZ 2 /**< Size of a 16-bit value. */ +#define NS_INT32SZ 4 /**< Size of a 32-bit value. */ +#define NS_CMPRSFLGS 0xc0 /**< Prefix flags that indicate special types */ +#define NS_MAXCDNAME 255 /**< Maximum length of a compressed domain name. */ +#define QUERY 0 /**< Forward (normal) DNS query operation. */ +#define NO_ERRORS 0 /**< No errors processing a query. */ +#define SERVFAIL 2 /**< Server error while processing a query. */ +#define NXDOMAIN 3 /**< Domain name in query does not exist. */ +#define T_A 1 /**< Hostname -> IPv4 query type. */ +#define T_AAAA 28 /**< Hostname -> IPv6 query type. */ +#define T_PTR 12 /**< IP(v4 or v6) -> hostname query type. */ +#define T_CNAME 5 /**< Canonical name resolution query type. */ +#define C_IN 1 /**< Internet query class. */ +#define QFIXEDSZ 4 /**< Length of fixed-size part of query. */ +#define HFIXEDSZ 12 /**< Length of fixed-size DNS header. */ + +/** Structure to store an IP address. */ +struct irc_in_addr +{ + unsigned short in6_16[8]; /**< IPv6 encoded parts, little-endian. */ +}; + +/** Structure to store an IP address and port number. */ +struct irc_sockaddr +{ + struct irc_in_addr addr; /**< IP address. */ + unsigned short port; /**< Port number, host-endian. */ +}; + +/** DNS callback function signature. */ +typedef void (*dns_callback_f)(void *vptr, const struct irc_in_addr *addr, const char *h_name); + +/** DNS query and response header. */ +typedef struct +{ + unsigned id :16; /**< query identification number */ +#ifdef WORDS_BIGENDIAN + /* fields in third byte */ + unsigned qr: 1; /**< response flag */ + unsigned opcode: 4; /**< purpose of message */ + unsigned aa: 1; /**< authoritive answer */ + unsigned tc: 1; /**< truncated message */ + unsigned rd: 1; /**< recursion desired */ + /* fields in fourth byte */ + unsigned ra: 1; /**< recursion available */ + unsigned unused :1; /**< unused bits (MBZ as of 4.9.3a3) */ + unsigned ad: 1; /**< authentic data from named */ + unsigned cd: 1; /**< checking disabled by resolver */ + unsigned rcode :4; /**< response code */ +#else + /* fields in third byte */ + unsigned rd :1; /**< recursion desired */ + unsigned tc :1; /**< truncated message */ + unsigned aa :1; /**< authoritive answer */ + unsigned opcode :4; /**< purpose of message */ + unsigned qr :1; /**< response flag */ + /* fields in fourth byte */ + unsigned rcode :4; /**< response code */ + unsigned cd: 1; /**< checking disabled by resolver */ + unsigned ad: 1; /**< authentic data from named */ + unsigned unused :1; /**< unused bits (MBZ as of 4.9.3a3) */ + unsigned ra :1; /**< recursion available */ +#endif + /* remaining bytes */ + unsigned qdcount :16; /**< number of question entries */ + unsigned ancount :16; /**< number of answer entries */ + unsigned nscount :16; /**< number of authority entries */ + unsigned arcount :16; /**< number of resource entries */ +} HEADER; + +extern void restart_resolver(void); +extern void clear_nameservers(void); +extern void add_nameserver(const char *ipaddr); +extern void add_local_domain(char *hname, size_t size); +extern size_t cres_mem(struct Client* cptr); +extern void delete_resolver_queries(const void *vptr); +extern void report_dns_servers(struct Client *source_p, const struct StatDesc *sd, char *param); +extern void gethost_byname(const char *name, dns_callback_f callback, void *ctx); +extern void gethost_byaddr(const struct irc_in_addr *addr, dns_callback_f callback, void *ctx); + +/** Evaluate to non-zero if \a ADDR is an unspecified (all zeros) address. */ +#define irc_in_addr_unspec(ADDR) (((ADDR)->in6_16[0] == 0) \ + && ((ADDR)->in6_16[1] == 0) \ + && ((ADDR)->in6_16[2] == 0) \ + && ((ADDR)->in6_16[3] == 0) \ + && ((ADDR)->in6_16[4] == 0) \ + && ((ADDR)->in6_16[6] == 0) \ + && ((ADDR)->in6_16[7] == 0) \ + && ((ADDR)->in6_16[5] == 0 \ + || (ADDR)->in6_16[5] == 65535)) +/** Evaluate to non-zero if \a ADDR is a valid address (not all 0s and not all 1s). */ +#define irc_in_addr_valid(ADDR) (((ADDR)->in6_16[0] && ~(ADDR)->in6_16[0]) \ + || (ADDR)->in6_16[1] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[2] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[3] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[4] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[5] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[6] != (ADDR)->in6_16[0] \ + || (ADDR)->in6_16[7] != (ADDR)->in6_16[0]) +/** Evaluate to non-zero if \a ADDR (of type struct irc_in_addr) is an IPv4 address. */ +#define irc_in_addr_is_ipv4(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \ + && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \ + && ((!(ADDR)->in6_16[5] && (ADDR)->in6_16[6]) \ + || (ADDR)->in6_16[5] == 65535)) +/** Evaluate to non-zero if \a A is a different IP than \a B. */ +#define irc_in_addr_cmp(A,B) (irc_in_addr_is_ipv4(A) ? ((A)->in6_16[6] != (B)->in6_16[6] \ + || (A)->in6_16[7] != (B)->in6_16[7] || !irc_in_addr_is_ipv4(B)) \ + : memcmp((A), (B), sizeof(struct irc_in_addr))) +/** Evaluate to non-zero if \a ADDR is a loopback address. */ +#define irc_in_addr_is_loopback(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \ + && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \ + && ((!(ADDR)->in6_16[5] \ + && ((!(ADDR)->in6_16[6] && (ADDR)->in6_16[7] == htons(1)) \ + || (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)) \ + || (((ADDR)->in6_16[5] == 65535) \ + && (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00))) + +#endif