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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="316.htm">上一层</a>][<a href="410.htm">下一篇</a>]
<hr><p align="left"><small>发信人: biff (大可), 信区: Security <br>
标 题: spoofscan <br>
发信站: 武汉白云黄鹤站 (Sun May 16 15:43:31 1999), 站内信件 <br>
恩,这个小程序是干什么的呢? <br>
........... <br>
仔细瞧瞧,呵呵,不赖哦~~ <br>
/* [ http://www.rootshell.com/ ] */ <br>
/* <br>
* spoofscan.c .. - jsbach proof of concept program..... a more robust usag <br>
e <br>
* of this concept is forthcoming.. spoofs ur ip as another box on ur <br>
* ethernet segment, portscans a host "from" that ip, sniffs responses from <br>
* the host. <br>
*/ <br>
/* <br>
to compile: gcc spoofscan.c -lpcap -o ss <br>
to use: ./ss host_to_spoof_as host_to_scan high_port <br>
remember, the host you're spoofing as MUST be on the same ethernet <br>
segment as you are, or this program will not work! <br>
*/ <br>
#include <netdb.h> <br>
#include <linux/sockios.h> <br>
#include <sys/socket.h> <br>
#include <sys/time.h> <br>
#include <netinet/in.h> <br>
#include <netinet/ip.h> <br>
#define __FAVOR_BSD <br>
#include <netinet/tcp.h> <br>
#include <bpf.h> <br>
#include <pcap.h> <br>
pcap_t *pcap_global_descriptor; <br>
char *deviceglobal; <br>
int offset; /* offset from datalink protocol hdr to ip <br>
* hdr */ <br>
int <br>
startpcap(void) <br>
{ <br>
char errbuf[1028]; <br>
int datalink; <br>
struct pcap_pkthdr useless; <br>
/* is the device null or set to the default still? if so look it up <br>
*/ <br>
if (!deviceglobal || !strcmp(deviceglobal, "default")) { <br>
deviceglobal = (char *) malloc(512); <br>
strcpy(deviceglobal, pcap_lookupdev(errbuf)); <br>
printf("ok got your device, it's %s.\n", deviceglobal); <br>
} <br>
/* its still null?! exit this mothafuckaH! :-) */ <br>
if (!deviceglobal) { <br>
printf("Error getting device - %s\n", errbuf); <br>
exit(1); <br>
} <br>
/* now open a "datalink descriptor" */ <br>
pcap_global_descriptor = pcap_open_live(deviceglobal, 90000, 1, 1000 <br>
, er <br>
rbuf); <br>
if (pcap_global_descriptor == NULL) { <br>
printf("error opening pcap: %s\n", errbuf); <br>
exit(1); <br>
} <br>
/* <br>
* set the offset from the beginning of the datagram that the iphdr <br>
* starts. <br>
*/ <br>
datalink = pcap_datalink(pcap_global_descriptor); <br>
bzero(&useless, sizeof(struct pcap_pkthdr)); <br>
/* <br>
/* <br>
* these offsets were taken from queso by savage@apostols.org who <br>
* took them from lamont something-or-other apparently <br>
*/ <br>
switch (datalink) { <br>
case DLT_EN10MB: <br>
offset = 14; <br>
break; <br>
case DLT_NULL: <br>
case DLT_PPP: <br>
offset = 4; <br>
break; <br>
case DLT_SLIP: <br>
offset = 16; <br>
break; <br>
case DLT_RAW: <br>
offset = 0; <br>
break; <br>
case DLT_SLIP_BSDOS: <br>
case DLT_PPP_BSDOS: <br>
offset = 24; <br>
break; <br>
case DLT_ATM_RFC1483: <br>
offset = 8; <br>
break; <br>
case DLT_IEEE802: <br>
offset = 22; <br>
break; <br>
default: <br>
fprintf(stderr, "unknown datalink type (%d)", datalink); <br>
return (0); <br>
} <br>
return 1; <br>
} <br>
void <br>
endpcap(void) <br>
{ <br>
pcap_close(pcap_global_descriptor); <br>
} <br>
int <br>
recvtcp(u_long from, char *buf, int sizeofbuffer) <br>
{ <br>
int datalink; <br>
struct pcap_pkthdr useless; <br>
struct p4ck3t { <br>
struct iphdr ip; <br>
struct tcphdr tcp; <br>
u_char *data; <br>
} <br>
*p4ck3t; <br>
p4ck3t = (struct p4ck3t *) pcap_next(pcap_global_descriptor, &useles <br>
s); <br>
(char *) p4ck3t += offset; <br>
if (ntohs(p4ck3t->ip.tot_len) > sizeofbuffer - 1) <br>
return 0; <br>
memcpy(buf, p4ck3t, ntohs(p4ck3t->ip.tot_len)); <br>
/* check to see if its somewhat valid */ <br>
if (p4ck3t->ip.version != 4) { <br>
return 0; <br>
} <br>
if (p4ck3t->ip.protocol == IPPROTO_TCP) { <br>
if (p4ck3t->ip.saddr == from) <br>
return 1; <br>
} <br>
return 0; <br>
} <br>
unsigned short <br>
unsigned short <br>
in_cksum(unsigned short *ptr, int nbytes) <br>
{ <br>
register long sum; /* assumes long == 32 bits */ <br>
u_short oddbyte; <br>
register u_short answer;/* assumes u_short == 16 bits */ <br>
/* <br>
* Our algorithm is simple, using a 32-bit accumulator (sum), <br>
* we add sequential 16-bit words to it, and at the end, fold back <br>
* all the carry bits from the top 16 bits into the lower 16 bits. <br>
*/ <br>
sum = 0; <br>
while (nbytes > 1) { <br>
sum += *ptr++; <br>
nbytes -= 2; <br>
} <br>
/* mop up an odd byte, if necessary */ <br>
if (nbytes == 1) { <br>
oddbyte = 0; /* make sure top half is zero */ <br>
*((u_char *) & oddbyte) = *(u_char *) ptr; /* one byte <br>
only <br>
*/ <br>
sum += oddbyte; <br>
} <br>
/* <br>
* Add back carry outs from top 16 bits to low 16 bits. <br>
*/ <br>
sum = (sum >> 16) + (sum & 0xffff); /* add high-16 to low-16 */ <br>
sum += (sum >> 16); /* add carry */ <br>
answer = ~sum; /* ones-complement, then truncate to 16 bits <br>
*/ <br>
return (answer); <br>
} <br>
int <br>
send_raw_tcp(u_long srcip, u_long dstip, u_short th_sport, <br>
u_short th_dport, u_short th_flags, <br>
u_short th_win) <br>
{ <br>
int sockfd, fromlen; /* guess */ <br>
int off = 1;/* off is really on.. heh=) */ <br>
struct pseudo { /* for tcp checksum calculation */ <br>
u_long saddr; <br>
u_long daddr; <br>
u_char zero; <br>
u_char protocol; <br>
u_short length; <br>
}; <br>
static struct tcphdr tcpret; <br>
int retval; <br>
struct sockaddr_in sheep; /* address info */ <br>
u_char packet[sizeof(struct iphdr) + sizeof(struct pseudo) <br>
+ si <br>
zeof(struct tcphdr)]; <br>
struct iphdr *ip = (struct iphdr *) packet; <br>
struct pseudo *pseudo = (struct pseudo *) (packet + sizeof(struct i <br>
phdr <br>
)); <br>
struct tcphdr *tcp = (struct tcphdr *) (packet + sizeof(struct iphd <br>
r) + <br>
sizeof(struct pseudo)); <br>
bzero(packet, sizeof(packet)); <br>
bzero(&sheep, sizeof(sheep)); <br>
srand(time(NULL)); <br>
pseudo->saddr = srcip; <br>
pseudo->daddr = dstip; <br>
pseudo->zero = 0; <br>
pseudo->protocol = IPPROTO_TCP; <br>
pseudo->length = htons(sizeof(struct tcphdr)); /* is this right? */ <br>
<br>
ip->version = 4; <br>
ip->ihl = 5; <br>
ip->id = 666; <br>
ip->saddr = srcip; <br>
//de src ip address iz SPOOFED HAHAHBWHAHAH <br>
ip->daddr = dstip; <br>
ip->protocol = IPPROTO_TCP; <br>
//YESSSSSSSS <br>
ip->ttl = 42; <br>
ip->frag_off = 0; <br>
ip->tot_len = sizeof(struct iphdr) + sizeof(struct tcphdr); <br>
tcp->th_sport = htons(th_sport); /* ba ba ba */ <br>
tcp->th_dport = htons(th_dport); <br>
tcp->th_seq = htonl(rand()); /* if i had just put in some number <br>
* maybe someone would build a <br>
* firewall to block thoze <br>
* segmentz!#$@ =) */ <br>
tcp->th_ack = htonl(rand()); <br>
tcp->th_off = 5; <br>
tcp->th_flags = th_flags; <br>
tcp->th_win = htons(th_win); <br>
tcp->th_urp = 0; <br>
tcp->th_sum = in_cksum((u_short *) pseudo, sizeof(struct pseudo) + s <br>
izeo <br>
f(struct tcphdr)); <br>
sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP); <br>
retval = setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &off, sizeof(off <br>
)); <br>
memcpy(pseudo, tcp, 20); <br>
sheep.sin_family = AF_INET; <br>
sheep.sin_addr.s_addr = dstip; <br>
fromlen = sizeof(sheep); <br>
sendto(sockfd, packet, sizeof(struct iphdr) + sizeof(struct tcphdr), <br>
<br>
0, (struct sockaddr *) & sheep, sizeof(sheep)); <br>
close(sockfd); <br>
} <br>
unsigned long int <br>
lookup(char *hostname) <br>
{ <br>
struct hostent *name; <br>
unsigned long int address; <br>
if ((address = inet_addr(hostname)) != -1) <br>
return address; <br>
if ((name = gethostbyname(hostname)) == NULL) <br>
return -1; <br>
memcpy(&address, name->h_addr, name->h_length); <br>
return address; <br>
} <br>
char <br>
* <br>
rlookup(u_long ip) <br>
{ <br>
static char hostname[256]; <br>
struct hostent *host; <br>
struct sockaddr_in addr; <br>
addr.sin_addr.s_addr = ip; <br>
host = gethostbyaddr((char *) &addr.sin_addr, sizeof(addr.sin_addr), <br>
AF_ <br>
INET); <br>
if (host == NULL) <br>
snprintf(hostname, 256, "%s\0", inet_ntoa(ip)); <br>
else <br>
snprintf(hostname, sizeof(hostname), "%s\0", host->h_name); <br>
return hostname; <br>
} <br>
int <br>
main(int argc, char **argv) <br>
{ <br>
u_long ourip, theirip; <br>
u_short highport, count; <br>
int timeout; <br>
char readbuf[2048]; <br>
struct p4ck3t { <br>
struct iphdr ip; <br>
struct tcphdr tcp; <br>
char data[2000]; <br>
} *p4ck3t; <br>
p4ck3t = (struct p4ck3t *) readbuf; <br>
if (argc < 3) { <br>
printf("usage: ./spoofscan <spoof ip> <their ip> <high port <br>
#>\n <br>
"); <br>
printf("questions, comments, etc: jsb4ch@hotmail.com\n"); <br>
exit(1); <br>
} <br>
} <br>
if ((ourip = lookup(argv[1])) == (int) -1) { <br>
printf("invalid spoof ip.\n"); <br>
exit(1); <br>
} <br>
if ((theirip = lookup(argv[2])) == (int) -1) { <br>
printf("invalid destination ip %s.\n", inet_ntoa(theirip)); <br>
exit(1); <br>
} <br>
highport = atoi(argv[3]); <br>
printf("src address is %s\n", inet_ntoa(ourip)); <br>
printf("dest address is %s.\n", inet_ntoa(theirip)); <br>
timeout = time(NULL) + 5; <br>
for (count = 0; count < highport; count++) { <br>
send_raw_tcp(ourip, theirip, count, count, TH_SYN, 1028); <br>
} <br>
startpcap(); <br>
while (time(NULL) < timeout) { <br>
if (recvtcp(theirip, readbuf, 500)) { <br>
if (p4ck3t->tcp.th_flags & TH_SYN) <br>
printf("-** port %d found open **-\n", ntohs <br>
(p4c <br>
k3t->tcp.th_sport)); <br>
} <br>
} <br>
} <br>
-- <br>
</small><hr>
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