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3ebcd29b13
Add PRIVATE query type with id 65399 (private use range). According to RFC3597 the reply data in a query with unspecified RR type must be handled as unstructured binary data, which means it can contain raw packet data just like the NULL type. Since the reply format is optimal it is ordered just after NULL in the priority order.
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*
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* Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
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* 2006-2009 Bjorn Andersson <flex@kryo.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef __COMMON_H__
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#define __COMMON_H__
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/* Last byte of raw header is the command */
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#define RAW_HDR_LEN 4
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#define RAW_HDR_IDENT_LEN 3
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#define RAW_HDR_CMD 3
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#define RAW_HDR_CMD_LOGIN 0x10
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#define RAW_HDR_CMD_DATA 0x20
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#define RAW_HDR_CMD_PING 0x30
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#define RAW_HDR_CMD_MASK 0xF0
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#define RAW_HDR_USR_MASK 0x0F
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#define RAW_HDR_GET_CMD(x) ((x)[RAW_HDR_CMD] & RAW_HDR_CMD_MASK)
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#define RAW_HDR_GET_USR(x) ((x)[RAW_HDR_CMD] & RAW_HDR_USR_MASK)
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extern const unsigned char raw_header[RAW_HDR_LEN];
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#ifdef WINDOWS32
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#include "windows.h"
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#else
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <err.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#endif
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#define DNS_PORT 53
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#ifndef MIN
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#define MIN(a,b) ((a)<(b)?(a):(b))
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#endif
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#ifndef MAX
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#define MAX(a,b) ((a)>(b)?(a):(b))
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#endif
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#define QUERY_NAME_SIZE 256
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#if defined IP_RECVDSTADDR
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# define DSTADDR_SOCKOPT IP_RECVDSTADDR
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# define dstaddr(x) ((struct in_addr *) CMSG_DATA(x))
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#elif defined IP_PKTINFO
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# define DSTADDR_SOCKOPT IP_PKTINFO
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# define dstaddr(x) (&(((struct in_pktinfo *)(CMSG_DATA(x)))->ipi_addr))
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#endif
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#if defined IP_MTU_DISCOVER
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/* Linux */
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# define IP_OPT_DONT_FRAG IP_MTU_DISCOVER
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# define DONT_FRAG_VALUE IP_PMTUDISC_DO
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#elif defined IP_DONTFRAG
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/* FreeBSD */
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# define IP_OPT_DONT_FRAG IP_DONTFRAG
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# define DONT_FRAG_VALUE 1
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#elif defined IP_DONTFRAGMENT
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/* Winsock2 */
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# define IP_OPT_DONT_FRAG IP_DONTFRAGMENT
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# define DONT_FRAG_VALUE 1
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#endif
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#define T_PRIVATE 65399
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/* Undefined RR type; "private use" range, see http://www.bind9.net/dns-parameters */
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#define T_UNSET 65432
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/* Unused RR type, never actually sent */
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struct packet
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{
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int len; /* Total packet length */
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int sentlen; /* Length of chunk currently transmitted */
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int offset; /* Current offset */
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char data[64*1024]; /* The data */
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char seqno; /* The packet sequence number */
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char fragment; /* Fragment index */
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};
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struct query {
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char name[QUERY_NAME_SIZE];
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unsigned short type;
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unsigned short rcode;
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unsigned short id;
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struct in_addr destination;
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struct sockaddr_storage from;
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int fromlen;
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unsigned short id2;
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struct sockaddr from2;
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int fromlen2;
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};
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enum connection {
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CONN_RAW_UDP,
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CONN_DNS_NULL,
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CONN_MAX
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};
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void check_superuser(void (*usage_fn)(void));
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char *format_addr(struct sockaddr_storage *sockaddr, int sockaddr_len);
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int get_addr(char *, int, int, int, struct sockaddr_storage *);
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int open_dns(struct sockaddr_storage *, size_t);
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int open_dns_from_host(char *host, int port, int addr_family, int flags);
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void close_dns(int);
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void do_chroot(char *);
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void do_setcon(char *);
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void do_detach();
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void do_pidfile(char *);
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void read_password(char*, size_t);
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int check_topdomain(char *, char **);
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#if defined(WINDOWS32) || defined(ANDROID)
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#ifndef ANDROID
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int inet_aton(const char *cp, struct in_addr *inp);
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#endif
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void err(int eval, const char *fmt, ...);
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void warn(const char *fmt, ...);
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void errx(int eval, const char *fmt, ...);
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void warnx(const char *fmt, ...);
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#endif
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int recent_seqno(int , int);
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#ifndef WINDOWS32
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void fd_set_close_on_exec(int fd);
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#endif
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#endif
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