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https://github.com/yarrick/iodine.git
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b4e9148df8
Read destination address of IP request packet and return it. Check length in client and use it as IPv4 or v6 depending on length.
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/*
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* Copyright (c) 2006-2015 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/or 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_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 sockaddr_storage destination;
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socklen_t dest_len;
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struct sockaddr_storage from;
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socklen_t fromlen;
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unsigned short id2;
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struct sockaddr_storage from2;
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socklen_t fromlen2;
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};
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enum connection {
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CONN_RAW_UDP = 0,
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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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