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/* $Id$ */
/* Copyright 1998 by the Massachusetts Institute of Technology.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#include <stdio.h>
#include <sys/types.h>
#ifdef WIN32
#else
#include <netinet/in.h>
/* We define closesocket() here so that we can use this function all over
the source code for closing sockets. */
#define closesocket(x) close(x)
#endif
#define DEFAULT_TIMEOUT 5
#define DEFAULT_TRIES 4
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
#ifdef WIN32
#define IsNT ((int)GetVersion()>0)
#define WIN_NS_9X "System\\CurrentControlSet\\Services\\VxD\\MSTCP"
#define WIN_NS_NT_KEY "System\\CurrentControlSet\\Services\\Tcpip\\Parameters"
#define NAMESERVER "NameServer"
#define DHCPNAMESERVER "DhcpNameServer"
#define PATH_HOSTS_NT "\\drivers\\etc\\hosts"
#define PATH_HOSTS_9X "\\hosts"
#else
#define PATH_RESOLV_CONF "/etc/resolv.conf"
#ifdef ETC_INET
#define PATH_HOSTS "/etc/inet/hosts"
#else
#define PATH_HOSTS "/etc/hosts"
#endif
#endif
struct send_request {
/* Remaining data to send */
const char *data;
int len;
/* Next request in queue */
struct send_request *next;
};
struct server_state {
struct in_addr addr;
int udp_socket;
int tcp_socket;
/* Mini-buffer for reading the length word */
unsigned char tcp_lenbuf[2];
int tcp_lenbuf_pos;
int tcp_length;
/* Buffer for reading actual TCP data */
unsigned char *tcp_buffer;
int tcp_buffer_pos;
/* TCP output queue */
struct send_request *qhead;
struct send_request *qtail;
};
struct query {
/* Query ID from qbuf, for faster lookup, and current timeout */
unsigned short qid;
time_t timeout;
/* Query buf with length at beginning, for TCP transmission */
char *tcpbuf;
int tcplen;
/* Arguments passed to ares_send() (qbuf points into tcpbuf) */
const char *qbuf;
int qlen;
ares_callback callback;
void *arg;
/* Query status */
int try;
int server;
int *skip_server;
int using_tcp;
int error_status;
/* Next query in chain */
struct query *next;
};
/* An IP address pattern; matches an IP address X if X & mask == addr */
struct apattern {
struct in_addr addr;
struct in_addr mask;
};
struct ares_channeldata {
/* Configuration data */
int flags;
int timeout;
int tries;
int ndots;
int udp_port;
int tcp_port;
char **domains;
int ndomains;
struct apattern *sortlist;
int nsort;
char *lookups;
/* Server addresses and communications state */
struct server_state *servers;
int nservers;
/* ID to use for next query */
unsigned short next_id;
/* Active queries */
struct query *queries;
};
void ares__send_query(ares_channel channel, struct query *query, time_t now);
void ares__close_sockets(struct server_state *server);
int ares__get_hostent(FILE *fp, struct hostent **host);
int ares__read_line(FILE *fp, char **buf, int *bufsize);
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