Building a Web Server

[wsxk]

https://wsxk.github.io/web_basic_2/

前言

1. 构建web server所需的system call与结构体

   1.1 用汇编来实现上述步骤

前言 要想构建一个简单的web server，最简单的办法当然是使用python辣，但是为了能够更清楚的了解web server的运行原理，在linux上用assembly是最合适的~ 首先需要了解的一点是：web server是构建在linux操作系统上的应用程序，其与外界进行互动时，需要让linux操作系统来充当中介

1. 构建web server所需的system call与结构体 int socket( int domain, //socket() creates an endpoint for communication
   int type, //and returns a file descriptor int protocol //that refers to that endpoint. )

int bind( int sockfd, //When a socket(2) is created with socket, struct sockaddr *addr, //it exists in a name space (address family) but has no address assigned to it. socklen_t addrlen//bind() assigns the address specified by addr to the socket referred to by the file descriptor sockfd. )

这里出现了关键的结构体： struct sockaddr { uint16_t sa_family; uint8_t sa_data[14]; }; // sockaddr结构体用来描述一个网络连接还是太粗糙了，于是有了下面的改进版本 struct sockaddr_in { uint16_t sin_family; uint16_t sin_port; uint32_t sin_addr; uint8_t __pad[8]; } // 可以看到sockaddr_in和sockaddr本质上是一个东西，只不过sockaddr_in划分结构体成员更加精细

int listen( int sockfd, //listen() marks the socket referred to by sockfd as a passive socket, int backlog//that is, as a socket that will be used to accept incoming connection requests using accept(2). )

int accept( int sockfd, //The accept() system call is used with connection-based socket types (SOCK_STREAM, SOCK_SEQPACKET). struct sockaddr addr,//It extracts the first connection request on the queue of pending connections for the listening socket, sockfd, socklen_t addrlen//creates a new connected socket, and returns a new file descriptor referring to that socket. )

一般服务器接收请求的步骤如下: socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 3 bind(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr(

[SuzumiyaAsahi]

我去，这么横吗？用汇编实现

[wsxk]

@SuzumiyaAsahi 我去，这么横吗？用汇编实现

只具有基本的http应答的功能就是了，hhh