333 lines
12 KiB
C
333 lines
12 KiB
C
/* $Id$ */
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/* Copyright 1998 by the Massachusetts Institute of Technology.
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* Copyright (C) 2007-2009 by Daniel Stenberg
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*
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* Permission to use, copy, modify, and distribute this
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* software and its documentation for any purpose and without
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* fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting
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* documentation, and that the name of M.I.T. not be used in
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* advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*/
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#ifndef ARES__H
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#define ARES__H
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#include "ares_build.h" /* c-ares build definitions */
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#include "ares_rules.h" /* c-ares rules enforcement */
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/*
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* Define WIN32 when build target is Win32 API
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*/
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#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
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#define WIN32
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#endif
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#include <sys/types.h>
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/* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
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libc5-based Linux systems. Only include it on system that are known to
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require it! */
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#if defined(_AIX) || defined(__NOVELL_LIBC__) || defined(__NetBSD__) || \
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defined(__minix) || defined(__SYMBIAN32__) || defined(__INTEGRITY)
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#include <sys/select.h>
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#endif
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#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
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#include <sys/bsdskt.h>
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#endif
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#if defined(WATT32)
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#include <netinet/in.h>
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#include <sys/socket.h>
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#include <tcp.h>
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#elif defined(WIN32)
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# ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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# endif
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# include <windows.h>
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# include <winsock2.h>
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# include <ws2tcpip.h>
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ARES_SUCCESS 0
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/* Server error codes (ARES_ENODATA indicates no relevant answer) */
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#define ARES_ENODATA 1
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#define ARES_EFORMERR 2
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#define ARES_ESERVFAIL 3
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#define ARES_ENOTFOUND 4
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#define ARES_ENOTIMP 5
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#define ARES_EREFUSED 6
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/* Locally generated error codes */
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#define ARES_EBADQUERY 7
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#define ARES_EBADNAME 8
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#define ARES_EBADFAMILY 9
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#define ARES_EBADRESP 10
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#define ARES_ECONNREFUSED 11
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#define ARES_ETIMEOUT 12
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#define ARES_EOF 13
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#define ARES_EFILE 14
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#define ARES_ENOMEM 15
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#define ARES_EDESTRUCTION 16
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#define ARES_EBADSTR 17
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/* ares_getnameinfo error codes */
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#define ARES_EBADFLAGS 18
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/* ares_getaddrinfo error codes */
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#define ARES_ENONAME 19
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#define ARES_EBADHINTS 20
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/* Flag values */
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#define ARES_FLAG_USEVC (1 << 0)
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#define ARES_FLAG_PRIMARY (1 << 1)
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#define ARES_FLAG_IGNTC (1 << 2)
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#define ARES_FLAG_NORECURSE (1 << 3)
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#define ARES_FLAG_STAYOPEN (1 << 4)
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#define ARES_FLAG_NOSEARCH (1 << 5)
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#define ARES_FLAG_NOALIASES (1 << 6)
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#define ARES_FLAG_NOCHECKRESP (1 << 7)
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/* Option mask values */
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#define ARES_OPT_FLAGS (1 << 0)
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#define ARES_OPT_TIMEOUT (1 << 1)
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#define ARES_OPT_TRIES (1 << 2)
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#define ARES_OPT_NDOTS (1 << 3)
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#define ARES_OPT_UDP_PORT (1 << 4)
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#define ARES_OPT_TCP_PORT (1 << 5)
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#define ARES_OPT_SERVERS (1 << 6)
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#define ARES_OPT_DOMAINS (1 << 7)
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#define ARES_OPT_LOOKUPS (1 << 8)
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#define ARES_OPT_SOCK_STATE_CB (1 << 9)
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#define ARES_OPT_SORTLIST (1 << 10)
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#define ARES_OPT_SOCK_SNDBUF (1 << 11)
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#define ARES_OPT_SOCK_RCVBUF (1 << 12)
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#define ARES_OPT_TIMEOUTMS (1 << 13)
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#define ARES_OPT_ROTATE (1 << 14)
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/* Nameinfo flag values */
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#define ARES_NI_NOFQDN (1 << 0)
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#define ARES_NI_NUMERICHOST (1 << 1)
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#define ARES_NI_NAMEREQD (1 << 2)
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#define ARES_NI_NUMERICSERV (1 << 3)
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#define ARES_NI_DGRAM (1 << 4)
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#define ARES_NI_TCP 0
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#define ARES_NI_UDP ARES_NI_DGRAM
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#define ARES_NI_SCTP (1 << 5)
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#define ARES_NI_DCCP (1 << 6)
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#define ARES_NI_NUMERICSCOPE (1 << 7)
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#define ARES_NI_LOOKUPHOST (1 << 8)
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#define ARES_NI_LOOKUPSERVICE (1 << 9)
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/* Reserved for future use */
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#define ARES_NI_IDN (1 << 10)
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#define ARES_NI_IDN_ALLOW_UNASSIGNED (1 << 11)
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#define ARES_NI_IDN_USE_STD3_ASCII_RULES (1 << 12)
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/* Addrinfo flag values */
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#define ARES_AI_CANONNAME (1 << 0)
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#define ARES_AI_NUMERICHOST (1 << 1)
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#define ARES_AI_PASSIVE (1 << 2)
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#define ARES_AI_NUMERICSERV (1 << 3)
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#define ARES_AI_V4MAPPED (1 << 4)
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#define ARES_AI_ALL (1 << 5)
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#define ARES_AI_ADDRCONFIG (1 << 6)
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/* Reserved for future use */
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#define ARES_AI_IDN (1 << 10)
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#define ARES_AI_IDN_ALLOW_UNASSIGNED (1 << 11)
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#define ARES_AI_IDN_USE_STD3_ASCII_RULES (1 << 12)
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#define ARES_AI_CANONIDN (1 << 13)
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#define ARES_AI_MASK (ARES_AI_CANONNAME|ARES_AI_NUMERICHOST|ARES_AI_PASSIVE| \
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ARES_AI_NUMERICSERV|ARES_AI_V4MAPPED|ARES_AI_ALL| \
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ARES_AI_ADDRCONFIG)
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#define ARES_GETSOCK_MAXNUM 16 /* ares_getsock() can return info about this
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many sockets */
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#define ARES_GETSOCK_READABLE(bits,num) (bits & (1<< (num)))
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#define ARES_GETSOCK_WRITABLE(bits,num) (bits & (1 << ((num) + \
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ARES_GETSOCK_MAXNUM)))
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/*
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* Typedef our socket type
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*/
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#ifndef ares_socket_typedef
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#ifdef WIN32
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typedef SOCKET ares_socket_t;
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#define ARES_SOCKET_BAD INVALID_SOCKET
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#else
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typedef int ares_socket_t;
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#define ARES_SOCKET_BAD -1
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#endif
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#define ares_socket_typedef
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#endif /* ares_socket_typedef */
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typedef void (*ares_sock_state_cb)(void *data,
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ares_socket_t socket_fd,
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int readable,
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int writable);
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struct apattern;
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/* NOTE about the ares_options struct to users and developers.
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This struct will remain looking like this. It will not be extended nor
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shrunk in future releases, but all new options will be set by ares_set_*()
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options instead of with the ares_init_options() function.
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Eventually (in a galaxy far far away), all options will be settable by
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ares_set_*() options and the ares_init_options() function will become
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deprecated.
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When new options are added to c-ares, they are not added to this
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struct. And they are not "saved" with the ares_save_options() function but
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instead we encourage the use of the ares_dup() function. Needless to say,
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if you add config options to c-ares you need to make sure ares_dup()
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duplicates this new option.
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*/
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struct ares_options {
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int flags;
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int timeout; /* in seconds or milliseconds, depending on options */
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int tries;
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int ndots;
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unsigned short udp_port;
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unsigned short tcp_port;
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int socket_send_buffer_size;
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int socket_receive_buffer_size;
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struct in_addr *servers;
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int nservers;
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char **domains;
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int ndomains;
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char *lookups;
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ares_sock_state_cb sock_state_cb;
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void *sock_state_cb_data;
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struct apattern *sortlist;
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int nsort;
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};
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struct hostent;
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struct timeval;
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struct sockaddr;
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struct ares_channeldata;
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typedef struct ares_channeldata *ares_channel;
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typedef void (*ares_callback)(void *arg, int status, int timeouts,
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unsigned char *abuf, int alen);
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typedef void (*ares_host_callback)(void *arg, int status, int timeouts,
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struct hostent *hostent);
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typedef void (*ares_nameinfo_callback)(void *arg, int status, int timeouts,
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char *node, char *service);
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typedef int (*ares_sock_create_callback)(ares_socket_t socket_fd,
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int type, void *data);
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int ares_init(ares_channel *channelptr);
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int ares_init_options(ares_channel *channelptr, struct ares_options *options,
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int optmask);
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int ares_save_options(ares_channel channel, struct ares_options *options,
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int *optmask);
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void ares_destroy_options(struct ares_options *options);
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int ares_dup(ares_channel *dest, ares_channel src);
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void ares_destroy(ares_channel channel);
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void ares_cancel(ares_channel channel);
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void ares_set_socket_callback(ares_channel channel,
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ares_sock_create_callback callback,
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void *user_data);
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void ares_send(ares_channel channel, const unsigned char *qbuf, int qlen,
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ares_callback callback, void *arg);
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void ares_query(ares_channel channel, const char *name, int dnsclass,
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int type, ares_callback callback, void *arg);
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void ares_search(ares_channel channel, const char *name, int dnsclass,
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int type, ares_callback callback, void *arg);
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void ares_gethostbyname(ares_channel channel, const char *name, int family,
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ares_host_callback callback, void *arg);
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int ares_gethostbyname_file(ares_channel channel, const char *name,
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int family, struct hostent **host);
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void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
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int family, ares_host_callback callback, void *arg);
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void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
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socklen_t salen, int flags,
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ares_nameinfo_callback callback,
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void *arg);
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int ares_fds(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
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int ares_getsock(ares_channel channel, int *socks, int numsocks);
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struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
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struct timeval *tv);
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void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds);
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void ares_process_fd(ares_channel channel, ares_socket_t read_fd,
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ares_socket_t write_fd);
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int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id,
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int rd, unsigned char **buf, int *buflen);
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int ares_expand_name(const unsigned char *encoded, const unsigned char *abuf,
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int alen, char **s, long *enclen);
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int ares_expand_string(const unsigned char *encoded, const unsigned char *abuf,
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int alen, unsigned char **s, long *enclen);
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/*
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* NOTE: before c-ares 1.6.1 we would most often use the system in6_addr
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* struct below when ares itself was built, but many apps would use this
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* private version since the header checked a HAVE_* define for it. Starting
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* with 1.6.1 we always declare and use our own to stop relying on the
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* system's one.
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*/
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struct ares_in6_addr {
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union {
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unsigned char _S6_u8[16];
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} _S6_un;
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};
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/*
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* TODO: the structs 'addrttl' and 'addr6ttl' really should get their names
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* prefixed with ares_ to keep them in our own "name space".
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*/
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struct addrttl {
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struct in_addr ipaddr;
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int ttl;
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};
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struct addr6ttl {
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struct ares_in6_addr ip6addr;
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int ttl;
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};
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/*
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** Parse the buffer, starting at *abuf and of length alen bytes, previously
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** obtained from an ares_search call. Put the results in *host, if nonnull.
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** Also, if addrttls is nonnull, put up to *naddrttls IPv4 addresses along with
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** their TTLs in that array, and set *naddrttls to the number of addresses
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** so written.
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*/
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int ares_parse_a_reply(const unsigned char *abuf, int alen,
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struct hostent **host,
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struct addrttl *addrttls, int *naddrttls);
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int ares_parse_aaaa_reply(const unsigned char *abuf, int alen,
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struct hostent **host,
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struct addr6ttl *addrttls, int *naddrttls);
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int ares_parse_ptr_reply(const unsigned char *abuf, int alen, const void *addr,
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int addrlen, int family, struct hostent **host);
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int ares_parse_ns_reply(const unsigned char *abuf, int alen,
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struct hostent **host);
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void ares_free_string(void *str);
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void ares_free_hostent(struct hostent *host);
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const char *ares_strerror(int code);
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#ifdef __cplusplus
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}
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#endif
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#endif /* ARES__H */
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