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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="416.htm">下一篇</a>]
<hr><p align="left"><small>发信人: AngelFalls (Happiness Forever), 信区: Security <br>
标 题: SYN/FIN扫描器程序 <br>
发信站: 武汉白云黄鹤站 (Wed Mar 29 18:16:50 2000), 站内信件 <br>
/*gcc -pipe -O3 -lpthread -o * *.c */ <br>
#include <stdio.h> <br>
#include <sys/time.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <sys/ioctl.h> <br>
#include <net/if.h> <br>
#include <netinet/ip.h> <br>
#include <netinet/in.h> <br>
#include <arpa/inet.h> <br>
#include <netinet/if_ether.h> <br>
#include <string.h> <br>
#include <netinet/tcp.h> <br>
#include <unistd.h> <br>
#include <fcntl.h> <br>
#include <pthread.h> <br>
#define SRCPORT 3000 <br>
#define HEADER_LEN 36 //24+12 <br>
#define PORTS 1024 <br>
int i_index; <br>
int i_index; <br>
struct thread_d{ <br>
int syn; <br>
u_int32_t saddr; <br>
u_int32_t daddr; <br>
u_int32_t seq; <br>
}; <br>
struct t_tcphdr{ <br>
struct tcphdr thdr; <br>
u_int8_t opt_name; <br>
u_int8_t opt_len; <br>
u_int16_t opt; <br>
}; <br>
u_int16_t in_chksum(u_short *addr, int len) <br>
{ <br>
u_int32_t sum = 0; <br>
u_int16_t *ad = addr, result; <br>
while(len > 1) <br>
{ <br>
sum += *ad++; <br>
len -= 2; <br>
} <br>
if(len == 1) <br>
{ <br>
result = 0; <br>
*((u_char *)&result) = *(u_char *)ad; <br>
sum += result; <br>
} <br>
sum = (sum >> 16) + (sum & 0xffff); <br>
sum += (sum >> 16); <br>
result = ~sum; <br>
return(result); <br>
} <br>
u_int32_t localIP(int sock) <br>
{ <br>
struct ifreq ifr; <br>
struct sockaddr_in *sa; <br>
strcpy(ifr.ifr_name, "eth0"); <br>
if( ioctl(sock, SIOCGIFADDR, &ifr) < 0 ) <br>
{ <br>
perror("Ioctl SIOGIFADDR"); <br>
exit(-1); <br>
} <br>
sa = (struct sockaddr_in*)&ifr.ifr_addr; <br>
return sa->sin_addr.s_addr; <br>
} <br>
void *getresponse(void *arg) <br>
{ <br>
struct thread_d *arg_r = (struct thread_d *)arg; <br>
u_char ports[PORTS], packet[1024]; <br>
fd_set rfd; <br>
struct sockaddr_in sa; <br>
struct in_addr sa_in; <br>
struct iphdr *i_hdr; <br>
struct tcphdr *thdr; <br>
int sock_pck, len, n, i; <br>
u_int32_t seq; <br>
struct timeval tv; <br>
char pchdest[20]; <br>
// pthread_detach( pthread_self() ); <br>
seq = arg_r->seq; <br>
sa_in.s_addr = arg_r->daddr; <br>
strncpy(pchdest, inet_ntoa(sa_in), 16); <br>
if( (sock_pck = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP))) < 0 ) <br>
{ <br>
perror("Socket Packet"); <br>
exit(-1); <br>
} <br>
if( !arg_r->syn ) <br>
bzero(ports, sizeof(ports)); <br>
while( 1 ) <br>
{ <br>
bzero(packet, sizeof(packet)); <br>
FD_ZERO(&rfd); <br>
FD_SET(sock_pck, &rfd); <br>
tv.tv_sec = 0; <br>
tv.tv_usec = 500; <br>
if( select(sock_pck+1, &rfd, NULL, NULL, &tv) == 0 ) <br>
if( i_index == PORTS-1 ) <br>
break; <br>
else <br>
continue; <br>
//54 is the sizeof iphdr + tcphdr + ethhdr <br>
if( (n = recvfrom(sock_pck, packet, 1024, 0, &sa, &len)) < 5 <br>
4) <br>
continue; <br>
i_hdr = (struct iphdr *)(packet + sizeof(struct ethhdr)); <br>
if( i_hdr->daddr == arg_r->saddr && i_hdr->saddr == arg_r->d <br>
addr <br>
addr <br>
) <br>
{ <br>
thdr = (struct tcphdr *)(packet + sizeof(struct ethh <br>
dr) <br>
+ sizeof(struct iphdr)); <br>
if( arg_r->syn && thdr->ack == 1 && thdr->ack_seq == <br>
hto <br>
nl(seq+1) && <br>
thdr->dest == htons(SRCPORT) ) <br>
{ <br>
if( thdr->rst == 0 ) <br>
printf("%s's port %4d is on service\ <br>
n", <br>
pchdest, <br>
ntohs(thdr->source)); <br>
} <br>
else if( !arg_r->syn && thdr->window == 0 && (ntohl( <br>
thdr <br>
->ack_seq) >= seq || <br>
ntohl(thdr->ack_seq) <= seq+32120) && thdr-> <br>
dest <br>
== htons(SRCPORT) ) <br>
if( thdr->rst == 1 ) <br>
ports[ntohs(thdr->source)] = 1; <br>
} <br>
} <br>
if( !arg_r->syn ) <br>
for(i=1; i<PORTS; i++) <br>
if(ports[i] == 0) <br>
printf("%s's port %4d is on service\n", pchdest, i); <br>
<br>
return NULL; <br>
} <br>
int main(int argc, char *argv[]) <br>
{ <br>
struct sockaddr_in sa_to, sa_fr, sa; <br>
struct t_tcphdr *t_hdr; <br>
struct tcphdr *thdr; <br>
struct iphdr *i_hdr; <br>
int syn = 0, sock_raw, sock_pck, i, flag, len; <br>
u_char *pseudo, pseudoHead[HEADER_LEN], packet[1024]; <br>
u_int16_t tcp_len; <br>
u_int32_t seq = getpid() | 0x40000000; <br>
const int on = 1; <br>
pthread_t tid; <br>
struct thread_d arg; <br>
if( argc != 3) <br>
{ <br>
printf("Usage : %s [-s, -f] remoteIP\n", argv[0]); <br>
exit(-1); <br>
} <br>
if( strcmp(argv[1], "-s") && strcmp(argv[1], "-f") ) <br>
{ <br>
printf("Usage : %s [-s, -f] remoteIP\n", argv[0]); <br>
exit(-1); <br>
} <br>
else if(!strcmp( argv[1], "-s" )) <br>
syn = 1; //syn = 0 means FIN scannning <br>
bzero(&sa_to, sizeof(sa_to)); <br>
sa_to.sin_family = AF_INET; <br>
if( inet_aton(argv[2], &sa_to.sin_addr) < 0 ) <br>
{ <br>
perror("Inet_aton"); <br>
exit(-1); <br>
} <br>
if( ( sock_raw = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0 ) <br>
{ <br>
perror("Socket Raw"); <br>
exit(-1); <br>
} <br>
bzero(&sa_fr, sizeof(sa_fr)); <br>
sa_fr.sin_family = AF_INET; <br>
sa_fr.sin_addr.s_addr = localIP(sock_raw); <br>
arg.syn = syn; <br>
arg.saddr = sa_fr.sin_addr.s_addr; <br>
arg.daddr = sa_to.sin_addr.s_addr; <br>
arg.seq = seq; <br>
pthread_create(&tid, NULL, getresponse, &arg); <br>
if( setsockopt(sock_raw, IPPROTO_IP, IP_HDRINCL, &on, sizeof(int)) < <br>
0 ) <br>
{ <br>
perror("SetSockOpt IPPROTO_IP"); <br>
exit(-1); <br>
} <br>
if( (flag = fcntl(sock_raw, F_GETFL)) < 0 ) <br>
{ <br>
perror("Fcntl GETFL"); <br>
exit(-1); <br>
} <br>
if( (flag = fcntl(sock_raw, F_SETFL, flag | O_NONBLOCK)) < 0 ) <br>
{ <br>
perror("Fcntl SETFL"); <br>
exit(-1); <br>
} <br>
usleep(50); <br>
for(i=1; i<PORTS ; i++) <br>
{ <br>
bzero(packet, sizeof(packet)); <br>
i_hdr = (struct iphdr *)packet; <br>
i_hdr->ihl = 5; <br>
i_hdr->version = 4; <br>
i_hdr->frag_off = htons(IP_DF); <br>
i_hdr->ttl = 64; <br>
i_hdr->protocol = IPPROTO_TCP; <br>
i_hdr->daddr = sa_to.sin_addr.s_addr; <br>
i_hdr->saddr = sa_fr.sin_addr.s_addr; <br>
t_hdr = (struct t_tcphdr *)(packet + sizeof(struct iphdr)); <br>
t_hdr->thdr.source = htons(SRCPORT); <br>
t_hdr->thdr.dest = htons(i); <br>
t_hdr->thdr.seq = htonl(seq); <br>
t_hdr->thdr.ack_seq = 0; <br>
t_hdr->thdr.doff = 5 + syn; <br>
t_hdr->thdr.fin = 1-syn; <br>
t_hdr->thdr.syn = syn; <br>
t_hdr->thdr.ack = 0; <br>
t_hdr->thdr.window = htons(32120); <br>
bzero(pseudoHead, HEADER_LEN); <br>
pseudo = pseudoHead; <br>
memcpy(pseudo, &(i_hdr->saddr), 8); <br>
pseudo += 9; <br>
memcpy(pseudo , &(i_hdr->protocol), 1); <br>
pseudo++; <br>
usleep(10); <br>
i_index = i; <br>
if( !syn ) <br>
{ <br>
tcp_len = htons( sizeof(struct tcphdr) ); <br>
memcpy(pseudo, &tcp_len, 2); <br>
pseudo += 2; <br>
memcpy(pseudo, t_hdr, sizeof(struct tcphdr)); <br>
t_hdr->thdr.check = in_chksum((u_short *)pseudoHead, <br>
HEA <br>
HEA <br>
DER_LEN - 4); <br>
if( sendto(sock_raw, packet, sizeof(struct tcphdr) + <br>
siz <br>
eof(struct iphdr), <br>
0, &sa_to, sizeof(sa_to)) < 0 ) <br>
perror("Sendto"); <br>
} <br>
else <br>
{ <br>
t_hdr->opt_name = 2; <br>
t_hdr->opt_len = 4; <br>
t_hdr->opt = htons(1460); <br>
tcp_len = htons( sizeof(struct t_tcphdr) ); <br>
memcpy(pseudo, &tcp_len, 2); <br>
pseudo += 2; <br>
memcpy(pseudo, t_hdr, sizeof(struct t_tcphdr)); <br>
t_hdr->thdr.check = in_chksum((u_short *)pseudoHead, <br>
HEA <br>
DER_LEN); <br>
if( sendto(sock_raw, packet, sizeof(struct iphdr) + <br>
size <br>
of(struct t_tcphdr), <br>
0, &sa_to, sizeof(sa_to)) < 0 ) <br>
perror("Sendto"); <br>
} <br>
} <br>
printf("Sending Ended!\n"); <br>
pthread_join(tid, NULL); <br>
return 0; <br>
} <br>
-- <br>
Wish your sky be sunny, <br>
Wish your heart be happy, <br>
Wish your body be healthy, <br>
Wish U never be lazy. <br>
:) :> ;) ;> :-) :-> ;-) ;-> <br>
※ 修改:．triton 于 Mar 29 21:55:55 修改本文．[FROM: prai.hust.edu.cn] <br>
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