-/*
- * irc2.7.2/ircd/res.h (C)opyright 1992 Darren Reed.
- *
- * $Id$
+/** @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 <sys/types.h> /* time_t */
+#include <sys/types.h>
#define INCLUDED_sys_types_h
#endif
+#ifndef INCLUDED_sys_socket_h
+#include <sys/socket.h>
+#define INCLUDED_sys_socket_h
+#endif
+
+#include <netdb.h>
+
+#ifndef INCLUDED_netinet_in_h
+#include <netinet/in.h>
+#define INCLUDED_netinet_in_h
+#endif
+
+#ifdef HAVE_STDINT_H
+#ifndef INCLUDED_stdint_h
+#include <stdint.h>
+#define INCLUDED_stdint_h
+#endif
+#endif
+
struct Client;
-struct hostent;
+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. */
-struct DNSReply {
- struct hostent* hp; /* hostent struct */
- int ref_count; /* reference count */
+/** Structure to store an IP address. */
+struct irc_in_addr
+{
+ unsigned short in6_16[8]; /**< IPv6 encoded parts, little-endian. */
};
-struct DNSQuery {
- void* vptr; /* pointer used by callback to identify request */
- void (*callback)(void* vptr, struct DNSReply* reply); /* callback to call */
+/** 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. */
};
-extern int ResolverFileDescriptor; /* GLOBAL - file descriptor (s_bsd.c) */
-
-extern void get_res(void);
-extern struct DNSReply* gethost_byname(const char* name,
- const struct DNSQuery* req);
-extern struct DNSReply* gethost_byaddr(const char* name,
- const struct DNSQuery* req);
-extern int init_resolver(void);
-extern void restart_resolver(void);
-extern time_t timeout_resolver(time_t now);
-/*
- * delete_resolver_queries - delete all outstanding queries for the
- * pointer arg, DO NOT call this from a resolver callback function the
- * resolver will delete the query itself for the affected client.
- */
-extern void delete_resolver_queries(const void* vptr);
-extern unsigned long cres_mem(struct Client* cptr);
-extern int m_dns(struct Client* cptr, struct Client* sptr,
- int parc, char* parv[]);
-extern int resolver_read(void);
-extern void resolver_read_multiple(int count);
-extern void flush_resolver_cache(void);
-
-/*
- * add_local_domain - append local domain suffix to hostnames that
- * don't contain a dot '.'
- * name - string to append to
- * len - total length of the buffer
- * name is modified only if there is enough space in the buffer to hold
- * the suffix
- */
-extern void add_local_domain(char* name, size_t len);
+/** DNS callback function signature. */
+typedef void (*dns_callback_f)(void *vptr, const struct irc_in_addr *addr, const char *h_name);
-#endif /* INCLUDED_res_h */
+/** 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
projects / ircu2.10.12-pk.git / blobdiff