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| 关键词： nbsp entries utmp defined printf USER struct return lastlog FILE |
一、说明用Socket的API Connect完成TCP建立连接的三次握手，同时子进程抓包，抓完三次握手的包后，插入第四个包即可，从对端返回的第五个包来看插入成功了，但因为插入了一个TCP包，之后的连接将发生混乱。可以将插入的那个包Data设置为HTTP Request，向WEB服务器提交请求。又如果目标系统的TCP序列号是可预计算的，那么是否可以做带伪源地址的Blind TCP three-time handshakes和插入，值得试验！二、脚本1、用到几个模块Net::RawIP Net::Pcap Net::PcapUtils NetPacket；2、pretty_table()函数是我原来做的，用来在命令行下打印表格（Table）；3、测试环境-Linux、ADSL拨号，抓包的接口是ppp0，帧的结构和Eth帧结构不同，不能使用NetPacket::Ethernet模块中的strip函数处理帧首部，根据ethereal抓包的结构，我使用unpack函数取得了帧中的IP包；三、源代码#!/usr/bin/perl#By [email protected], 2005/04use strict;use warnings;use Net::RawIP;use Net::PcapUtils;use NetPacket::Ethernet;use NetPacket::IP;use NetPacket::TCP;use Socket;use Getopt::Std;use POSIX qw(strftime);my %opts;getopts('ht:p:u:n:', \%opts);print_help() and exit if(defined($opts{'h'}));print_help() and exit if(not defined($opts{'t'}) or not defined($opts{'p'}));die "\tInvalid Target Ipaddress!\n" if(defined($opts{'t'}) and $opts{'t'} !~ m/^\d+.\d+.\d+.\d+$/);die "\tInvalid Service Port!\n" if(defined($opts{'p'}) and $opts{'p'} !~ m/^\d+$/);my $request;if(defined($opts{'u'})) { $request = "GET $opts{'u'} HTTP/1.1\r\n"; $request.= "Accept: text/html; text/plain\r\n"; $request.= "\r\n";} else { $request = "GET / HTTP/1.1\r\n"; $request.= "Accept: text/html; text/plain\r\n"; $request.= "\r\n";}my $child = fork();if($child == 0) { #child process my ($next_packet, %next_header); my ($frame_hdr, $ip_packet); my ($ip_obj, $tcp_obj); my $counter = 0; my $pkt_descriptor = Net::PcapUtils::open( FILTER => 'ip', PROMISC => 0, DEV => 'ppp0', #DEV => 'eth0' ); die "Net::PcapUtils::open returned: $pkt_descriptor\n" if (!ref($pkt_descriptor)); print strftime '%Y/%m/%d %H:%M:%S, ', localtime and print "begin sniffing ...\n"; while(($next_packet, %next_header) = Net::PcapUtils::next($pkt_descriptor)) { ($frame_hdr, $ip_packet) = unpack 'H32a*', $next_packet; $ip_obj = NetPacket::IP->decode($ip_packet); #$ip_obj = NetPacket::IP->decode(NetPacket::Ethernet::eth_strip($next_packet)); next if ($ip_obj->{'proto'} != 6); next if (($ip_obj->{'src_ip'} ne $opts{'t'}) and ($ip_obj->{'dest_ip'} ne $opts{'t'})); $tcp_obj = NetPacket::TCP->decode($ip_obj->{'data'}); next if (($tcp_obj->{'src_port'} ne $opts{'p'}) and ($tcp_obj->{'dest_port'} ne $opts{'p'})); $counter++; print "==ID.$counter==", '=' x 60, "\n"; print get_ip_hdr($ip_obj); print get_tcp_hdr($tcp_obj); if($tcp_obj->{'data'}) { my $data; $data = unpack 'a*', $tcp_obj->{'data'}; $data =~ s/[\r][\n]//g; print pretty_table('TCP data', [$data]); } if($counter == 3) { my $a = new Net::RawIP; $a->set({ 'ip' => { 'id' => $ip_obj->{'id'} + 1, 'saddr' => $ip_obj->{'src_ip'}, 'daddr' => $ip_obj->{'dest_ip'} }, 'tcp' => { 'source' => $tcp_obj->{'src_port'}, 'dest' => $tcp_obj->{'dest_port'}, 'seq' => $tcp_obj->{'seqnum'}, 'ack_seq' => $tcp_obj->{'acknum'}, 'window' => $tcp_obj->{'winsize'}, 'data' => $request, 'psh' => 1, 'ack' => 1 } }); $a->send; } last if($counter == 5); } exit;} else { sleep(1); my $trans_serv = getprotobyname('tcp'); my $dest_sockaddr = sockaddr_in($opts{'p'}, inet_aton($opts{'t'})); socket(TCP_SOCK, PF_INET, SOCK_STREAM, $trans_serv); connect(TCP_SOCK, $dest_sockaddr); sleep(1); #close TCP_SOCK;}exit;sub print_help { print <<HELP %./iamFool.pl [-h] <-t,-p,-u,-n> -h print help -t target ipaddr -p service port -u requested url by:i_am_jojo\@msn.com HELP}sub get_ip_hdr { my $ip_obj = shift; my @ip_hdr; push @ip_hdr, [qw(ver tos flags id src_ip proto)]; push @{$ip_hdr[1]}, $ip_obj->{$_} foreach (qw(ver tos flags id src_ip proto)); push @ip_hdr, [qw(hlen len foffset ttl dest_ip cksum)]; push @{$ip_hdr[3]}, $ip_obj->{$_} foreach (qw(hlen len foffset ttl dest_ip cksum)); return pretty_table('IP Header', @ip_hdr);}sub get_tcp_hdr { my $tcp_obj = shift; my @tcp_hdr; push @tcp_hdr, [qw(src_port seqnum hlen flags)]; push @{$tcp_hdr[1]}, $tcp_obj->{$_} foreach (qw(src_port seqnum hlen flags)); push @tcp_hdr, [qw(dest_port acknum reserved winsize)]; push @{$tcp_hdr[3]}, $tcp_obj->{$_} foreach (qw(dest_port acknum reserved winsize)); return pretty_table('TCP Header', @tcp_hdr);}sub pretty_table { # prettyTable($aString, @aList); @aList = ( [...], [...] ); # by [email protected] my ($title, @data) = @_; my @temp; my @max_length; my $row_length; my $indent = 4; my $the_table; foreach my $col (0..$#{$data[0]}) { push @{$temp[$col]}, $_->[$col] foreach (@data); } $max_length[$_] = length( (sort{length($b) <=> length($a)} @{$data[$_]} )[0]) + 2 foreach (0..$#data); $row_length+= $max_length[$_] foreach (0..$#{$temp[0]}); $row_length+= $#data; $the_table = ' ' x $indent.'+'.'-' x $row_length."+\n"; $the_table.= ' ' x $indent.'| '.$title.' ' x ($row_length - length($title) - 1)."|\n"; foreach my $row (0..$#temp) { $the_table.= ' ' x $indent; $the_table.= '+'.'-' x $max_length[$_] foreach (0.. $#{$temp[0]}); $the_table.= "+\n"; $the_table.= ' ' x $indent; $the_table.= '| '.@{$temp[$row]}[$_].' ' x ($max_length[$_] - length(@{$temp[$row]}[$_]) - 1) foreach (0.. $#{$temp[0]}); $the_table.= "|\n"; } $the_table.= ' ' x $indent; $the_table.= '+'.'-' x $max_length[$_] foreach (0.. $#{$temp[0]}); $the_table.= "+\n"; return $the_table;} 四、结果举例==Result eXample==2005/05/02 21:51:23, begin sniffing ...==ID.1============================================================== +---------------------------------------------------+ | IP Header | +--------+---------------+---------+----------------+ | ver | 4 | hlen | 5 | +--------+---------------+---------+----------------+ | tos | 0 | len | 60 | +--------+---------------+---------+----------------+ | flags | 2 | foffset | 0 | +--------+---------------+---------+----------------+ | id | 20682 | ttl | 64 | +--------+---------------+---------+----------------+ | src_ip | 218.11.149.14 | dest_ip | 64.233.189.104 | +--------+---------------+---------+----------------+ | proto | 6 | cksum | 31878 | +--------+---------------+---------+----------------+ +------------------------------------------+ | TCP Header | +----------+------------+-----------+------+ | src_port | 32851 | dest_port | 80 | +----------+------------+-----------+------+ | seqnum | 1104143983 | acknum | 0 | +----------+------------+-----------+------+ | hlen | 10 | reserved | 0 | +----------+------------+-----------+------+ | flags | 2 | winsize | 5808 | +----------+------------+-----------+------+==ID.2============================================================== +---------------------------------------------------+ | IP Header | +--------+----------------+---------+---------------+ | ver | 4 | hlen | 5 | +--------+----------------+---------+---------------+ | tos | 0 | len | 44 | +--------+----------------+---------+---------------+ | flags | 0 | foffset | 0 | +--------+----------------+---------+---------------+ | id | 63029 | ttl | 241 | +--------+----------------+---------+---------------+ | src_ip | 64.233.189.104 | dest_ip | 218.11.149.14 | +--------+----------------+---------+---------------+ | proto | 6 | cksum | 26154 | +--------+----------------+---------+---------------+ +------------------------------------------------+ | TCP Header | +----------+------------+-----------+------------+ | src_port | 80 | dest_port | 32851 | +----------+------------+-----------+------------+ | seqnum | 3660731207 | acknum | 1104143984 | +----------+------------+-----------+------------+ | hlen | 6 | reserved | 0 | +----------+------------+-----------+------------+ | flags | 18 | winsize | 4356 | +----------+------------+-----------+------------+==ID.3============================================================== +---------------------------------------------------+ | IP Header | +--------+---------------+---------+----------------+ | ver | 4 | hlen | 5 | +--------+---------------+---------+----------------+ | tos | 0 | len | 40 | +--------+---------------+---------+----------------+ | flags | 2 | foffset | 0 | +--------+---------------+---------+----------------+ | id | 20684 | ttl | 64 | +--------+---------------+---------+----------------+ | src_ip | 218.11.149.14 | dest_ip | 64.233.189.104 | +--------+---------------+---------+----------------+ | proto | 6 | cksum | 31896 | +--------+---------------+---------+----------------+ +------------------------------------------------+ | TCP Header | +----------+------------+-----------+------------+ | src_port | 32851 | dest_port | 80 | +----------+------------+-----------+------------+ | seqnum | 1104143984 | acknum | 3660731208 | +----------+------------+-----------+------------+ | hlen | 5 | reserved | 0 | +----------+------------+-----------+------------+ | flags | 16 | winsize | 5808 | +----------+------------+-----------+------------+==ID.4============================================================== +---------------------------------------------------+ | IP Header | +--------+---------------+---------+----------------+ | ver | 4 | hlen | 5 | +--------+---------------+---------+----------------+ | tos | 16 | len | 89 | +--------+---------------+---------+----------------+ | flags | 2 | foffset | 0 | +--------+---------------+---------+----------------+ | id | 20685 | ttl | 64 | +--------+---------------+---------+----------------+ | src_ip | 218.11.149.14 | dest_ip | 64.233.189.104 | +--------+---------------+---------+----------------+ | proto | 6 | cksum | 31830 | +--------+---------------+---------+----------------+ +------------------------------------------------+ | TCP Header | +----------+------------+-----------+------------+ | src_port | 32851 | dest_port | 80 | +----------+------------+-----------+------------+ | seqnum | 1104143984 | acknum | 3660731208 | +----------+------------+-----------+------------+ | hlen | 5 | reserved | 0 | +----------+------------+-----------+------------+ | flags | 24 | winsize | 5808 , | +----------+------------+-----------+------------+ +--------------------------------------------+ | TCP data | +--------------------------------------------+ | GET / HTTP/1.1Accept: text/html; text/plai | +--------------------------------------------+==ID.5============================================================== +---------------------------------------------------+ | IP Header | +--------+----------------+---------+---------------+ | ver | 4 | hlen | 5 | +--------+----------------+---------+---------------+ | tos | 0 | len | 40 | +--------+----------------+---------+---------------+ | flags | 0 | foffset | 0 | +--------+----------------+---------+---------------+ | id | 47931 | ttl | 241 | +--------+----------------+---------+---------------+ | src_ip | 64.233.189.104 | dest_ip | 218.11.149.14 | +--------+----------------+---------+---------------+ | proto | 6 | cksum | 41256 | +--------+----------------+---------+---------------+ +------------------------------------------------+ | TCP Header | +----------+------------+-----------+------------+ | src_port | 80 | dest_port | 32851 | +----------+------------+-----------+------------+ | seqnum | 3660731208 | acknum | 1104144033 | +----------+------------+-----------+------------+ | hlen | 5 | reserved | 0 | +----------+------------+-----------+------------+ | flags | 16 | winsize | 4356 | +----------+------------+-----------+------------+===End=== |
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