1.几个代码伪装成高级黑客
2.Nginx源码分析—HTTP模块之TCP连接建立过程详解
3.零基础5分钟开发一个简单的编编程步骤ModBus TCP主站上位机（附源码）
4.TCP之深入浅出send&recv
5.从 Linux源码 看 Socket(TCP)的accept
6.å¦ä½ç¼åç®åçsocketç½ç»ç¨åº å¦ä½ç¼ååºäºTCPåè®®çç½ç»ç¨åº
几个代码伪装成高级黑客
1. Introduction
作为计算机科学领域中最为著名的职业之一，黑客在当前的程源网络时代中有着不可忽视的作用。高级黑客更是编编程步骤其中的佼佼者，他们不仅具备了深厚的程源计算机技术知识，更能够使用各种技术手段，编编程步骤无中生有、程源阿拉德情怀源码突破困境、编编程步骤扰乱秩序等，程源令人望尘莫及。编编程步骤本文将会介绍一些简单的程源代码，让大家了解如何通过伪装成高级黑客，编编程步骤获得与众不同、程源且备受他人崇拜的编编程步骤感受。
2. 建立IP连接
在Python中，程源我们可以使用socket库来建立一个IP连接，编编程步骤并实现从目标服务器上获取数据的操作，下面是一段伪装成高级黑客的代码：
```python
import socket
def conn(IP, Port):
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect((IP,Port))
while True:
data = client.recv()
print (\'receive:\', data.decode()) #将获取到的数据进行解码
client.send(\'ACK!\'.encode()) #发送一个确认信息
if __name__ == \'__main__\':
conn(\'.0.0.1\', )
```
通过以上代码，我们可以连接到指定的服务器和对应的端口，获取到服务器发送的源码使者数据，并且能够对服务器返回一份确认信息，同时也向别人表现出伪装成高级黑客，游刃有余的状态。
3. 文件域修改
文件域修改是黑客行业中非常重要的一环，它可以改变一个可编辑文件中特定寻址位置的值。这个方法可以被用来对各种各样的文件（如二进制文件）进行操控。下列的Python代码可以让你的伪装更加漂亮：
```python
import struct
import os
def change_value(file_path, offset, value):
with open(file_path, \"r+b\") as f:
f.seek(offset)
f.write(struct.pack(\'i\', value))
if __name__ == \"__main__\":
file_path = \"/etc/hosts\"
offset =
value =
change_value(file_path, offset, value)
```
以上代码用到了struct结构体和os模块，使用`r+`文件模式打开指定的文件，通过file.seek()方法改变寻址位置，源码商海最后使用`struct.pack()`方法打包整数，并使用write()方法写入文件中。当写入完成后，文件中的值也随之更改。这时，你已成为了一个擅长黑客技术的“高手”。
4. 网络嗅探
网络嗅探是指在一个网络中抓取和记录经过网络的信息，并对这些信息进行分析。在现代网络安全领域中，lsh源码网络嗅探被广泛地应用于网络审计和攻击检测。下面是一个伪装成高级黑客的Python代码示例，可以用于嗅探TCP流量包：
```python
import socket
def sniffTCP(port):
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
sock.bind((\'.0.0.1\', port))
while True:
packet = sock.recvfrom()[0]
ip_header = packet[0:]
tcp_header = packet[:]
print(\"TCP Source Port: %d\" % ord(tcp_header[0]))
except KeyboardInterrupt:
print(\'Interrupted.\')
if __name__ == \"__main__\":
sniffTCP()
```
上述程序使用Python的socket库来监听指定的端口，收集包含TCP流量的数据报，并在控制台输出源端口号。此时，你已经成为一个懂得TCP嗅探技术的黑客了。
5. 爬取网页信息
网络爬虫被广泛用于百度和谷歌搜索引擎中，通过分析网页的历史源码源代码，检查网站的链接，实现数据抓取和分析。下面是一个伪装成高级黑客的Python代码示例，可以用于网页爬取，我们可以把以前熟悉的requests库和xpath技术结合运用。
```python
import requests
from lxml import html
def get_info(url):
page = requests.get(url)
tree = html.fromstring(page.content)
title = tree.xpath(\'//title\')[0].text_content()
print(\'Website Title:\', title)
links = tree.xpath(\'//a/@href\')
print(\'Links:\')
for link in links:
print(link)
if __name__ == \'__main__\':
get_info(\'\')
```
这些代码使用了requests和lxml库，获取页面内容并解析HTML，以提取指定节点的数据，如标题和链接。此时，在码量不大的情况下，你已成为一个懂得网页爬取技术的黑客了。
结论
以上提供的伪装成高级黑客的五个应用程序演示了Python的实用性和可扩展性。通过这些例子，我们可以使自己更好的了解Python，更好地思考如何在网络和数据安全方面实现自己所需的操作。同时，我们也可以通过这些代码，感受到黑客的精神和技术的魅力，找寻到自己更好的成长和发展机会。
Nginx源码分析—HTTP模块之TCP连接建立过程详解
Nginx源码中HTTP模块的TCP连接建立过程详细解析如下：
首先，监听套接字的初始化由ngx_ment (lib,"ws2_.lib")
ããint main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;
}
if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return 0;
}
ããSOCKET socketServer=socket(AF_INET,SOCK_STREAM,0);
ããSOCKADDR_IN addrServer;
ããaddrServer.sin_family=AF_INET;
ããaddrServer.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
ããaddrServer.sin_port=htons();
ããbind(socketServer, (struct sockaddr *)&addrServer, sizeof(struct sockaddr));
ããlisten(socketServer, 5);
ããSOCKADDR_IN addrClient;
ããint addrLen=sizeof(SOCKADDR_IN);
ããchar sendBuf[];
ããchar recvBuf[];
ããint i=1;
while(1)
{
printf("æå¡å¨ç«¯çå¾ ç¬¬%d个客æ·ç«¯è¿æ¥è¯·æ±...\n", i++);
ããSOCKET newsocketServer=accept(socketServer,(struct sockaddr *)&addrClient, &addrLen);
ããif(newsocketServer!=INVALID_SOCKET)
{
printf("æå¡å¨ç«¯ä¸å®¢æ·ç«¯è¿æ¥æå...\n");
}
ããmemset(sendBuf,0,);
ããsprintf(sendBuf,"Welcome you to come here");
ããsend(newsocketServer, sendBuf, strlen(sendBuf)+1,0);
ããmemset(recvBuf,0,);
ããrecv(newsocketServer,recvBuf,,0);
ããprintf("æå¡å¨ç«¯æ¶å°ä¿¡æ¯:%s\n",recvBuf);
ããclosesocket(newsocketServer);
}
ããWSACleanup();
ããreturn 0;
}
ããæ¤æç« æ¥èªäºä¸ªäººåå®¢ï¼ é¿æµªå客 /wenxianliang@/
ãã客æ·ç«¯æºç ï¼
ãã#include<stdio.h>
#include <Winsock2.h>
#pragma comment (lib,"ws2_.lib")
ããint main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return 0;
}
if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return 0;
}
SOCKET socketClient=socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addrServer;
addrServer.sin_family=AF_INET;
addrServer.sin_addr.S_un.S_addr=inet_addr(".0.0.1");
addrServer.sin_port=htons();
char sendBuf[];
char recvBuf[];
ããprintf("客æ·ç«¯åæå¡å¨ç«¯è¿æ¥è¯·æ±...\n");
ããint Isconnect=connect(socketClient, (struct sockaddr *)&addrServer, sizeof(struct sockaddr));
ããif(Isconnect!=0)
{
printf("客æ·ç«¯æ æ³è¿æ¥æå¡å¨ç«¯...\n");
ããreturn 0;
}
ããprintf("客æ·ç«¯å·²æåè¿æ¥æå¡å¨ç«¯...\n");
ããmemset(recvBuf,0,);
recv(socketClient,recvBuf,,0);
ããprintf("客æ·ç«¯æ¶å°ä¿¡æ¯:%s\n",recvBuf);
ããmemset(sendBuf,0,);
sprintf(sendBuf,"Hello , I am Mr Wen !");
send(socketClient, sendBuf, strlen(sendBuf)+1,0);
closesocket(socketClient);
WSACleanup();
return 0;
}
linux下socket 网络编程(客户端向服务器端发送文件) 求源代码 大哥大姐帮帮忙 ,。。谢谢
源代码奉上，流程图。。。这个太简单了，你自己看看。。。。。。。
//TCP
//服务器端程序
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
void main( void )
{
int iServerSock;
int iClientSock;
char *buf = "hello, world!\n";
struct sockaddr_in ServerAddr;
struct sockaddr_in ClientAddr;
int sin_size;
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )//初始化
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iServerSock = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );//监视的端口号
ServerAddr.sin_addr.s_addr = INADDR_ANY;//本地IP
memset( & ( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( bind( iServerSock, ( struct sockaddr * )&ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "bind调用失败!\n" );
WSACleanup( );
exit( 0 );
}
if( listen( iServerSock, BACKLOG ) == -1 )
{
printf( "listen调用失败!\n" );
WSACleanup( );
exit( 0 );
}
while( TRUE )
{
sin_size = sizeof( struct sockaddr_in );
iClientSock = accept( iServerSock, ( struct sockaddr * )&ClientAddr, &sin_size );
if( iClientSock == -1 )
{
printf( "accept调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "服务器连接到%s\n", inet_ntoa( ClientAddr.sin_addr ) );
if( send( iClientSock, buf, strlen( buf ), 0 ) == -1 )
{
printf( "send调用失败!" );
closesocket( iClientSock );
WSACleanup( );
exit( 0 );
}
}
}
/////客户端程序
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
#define MAXDATASIZE
void main( void )
{
int iClientSock;
char buf[ MAXDATASIZE ];
struct sockaddr_in ServerAddr;
int numbytes;
// struct hostent *he;
WSADATA WSAData;
// int sin_size;
/* if( ( he = gethostbyname( "liuys" ) ) == NULL )
{
printf( "gethostbyname调用失败!" );
WSACleanup( );
exit( 0 );
}
*/
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )//初始化
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iClientSock = socket( AF_INET, SOCK_STREAM, 0 ) ) == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );
// ServerAddr.sin_addr = *( ( struct in_addr * )he->h_addr );
ServerAddr.sin_addr.s_addr = inet_addr( "..2." );//记得换IP
memset( &( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( connect( iClientSock, ( struct sockaddr * ) & ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "connect失败!" );
WSACleanup( );
exit( 0 );
}
numbytes = recv( iClientSock, buf, MAXDATASIZE, 0 );
if( numbytes == -1 )
{
printf( "recv失败!" );
WSACleanup( );
exit( 0 );
}
buf[ numbytes ] = '\0';
printf( "Received: %s", buf );
closesocket( iClientSock );
WSACleanup( );
}
/////UDP
//服务器
#include< stdio.h >
#include< string.h >
#include< winsock.h >
#include< windows.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define BACKLOG
#define TRUE 1
#define MAXDATASIZE
void main( void )
{
int iServerSock;
// int iClientSock;
int addr_len;
int numbytes;
char buf[ MAXDATASIZE ];
struct sockaddr_in ServerAddr;
struct sockaddr_in ClientAddr;
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
iServerSock = socket( AF_INET, SOCK_DGRAM, 0 );
if( iServerSock == INVALID_SOCKET )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );//监视的端口号
ServerAddr.sin_addr.s_addr = INADDR_ANY;//本地IP
memset( & ( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
if( bind( iServerSock, ( struct sockaddr * )&ServerAddr, sizeof( struct sockaddr ) ) == -1 )
{
printf( "bind调用失败!\n" );
WSACleanup( );
exit( 0 );
}
addr_len = sizeof( struct sockaddr );
numbytes = recvfrom( iServerSock, buf, MAXDATASIZE, 0, ( struct sockaddr * ) & ClientAddr, &addr_len );
if( numbytes == -1 )
{
printf( "recvfrom调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "got packet from %s\n", inet_ntoa( ClientAddr.sin_addr ) );
printf( "packet is %d bytes long\n", numbytes );
buf[ numbytes ] = '\0';
printf( "packet contains \"%s\"\n", buf );
closesocket( iServerSock );
WSACleanup( );
}
//客户端
#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#pragma comment( lib, "ws2_.lib" )
#define PORT
#define MAXDATASIZE
void main( void )
{
int iClientSock;
struct sockaddr_in ServerAddr;
int numbytes;
char buf[ MAXDATASIZE ] = { 0 };
WSADATA WSAData;
if( WSAStartup( MAKEWORD( 1, 1 ), &WSAData ) )
{
printf( "initializationing error!\n" );
WSACleanup( );
exit( 0 );
}
if( ( iClientSock = socket( AF_INET, SOCK_DGRAM, 0 ) ) == -1 )
{
printf( "创建套接字失败!\n" );
WSACleanup( );
exit( 0 );
}
ServerAddr.sin_family = AF_INET;
ServerAddr.sin_port = htons( PORT );
ServerAddr.sin_addr.s_addr = inet_addr( "..2." );//记得换IP
memset( &( ServerAddr.sin_zero ), 0, sizeof( ServerAddr.sin_zero ) );
numbytes = sendto( iClientSock, buf, strlen( buf ), 0, ( struct sockaddr * ) & ServerAddr, sizeof( struct sockaddr ) );
if( numbytes == -1 )
{
printf( "sendto调用失败!\n" );
WSACleanup( );
exit( 0 );
}
printf( "sent %d bytes to %s\n", numbytes, inet_ntoa( ServerAddr.sin_addr ) );
closesocket( iClientSock );
WSACleanup( );
}
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