用纯C语言 怎样编程,解析HTTP协议。

// server.c 需要的自己改下···

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <sys/wait.h>

#include <signal.h>

#define MYPORT 80

#define BACKLOG 10

void sigchld_handler(int s)

{

while(wait(NULL) >0)

}

int main(void)

{

int sockfd, new_fd

struct sockaddr_in my_addr

struct sockaddr_in their_addr

int sin_size

struct sigaction sa

int yes=1

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {

perror("socket")

exit(1)

}

if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {

perror("setsockopt")

exit(1)

}

my_addr.sin_family = AF_INET

my_addr.sin_port = htons(MYPORT)

my_addr.sin_addr.s_addr = INADDR_ANY

memset(&(my_addr.sin_zero), '\0', 8 )

if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {

perror("bind")

exit(1)

}

if (listen(sockfd, BACKLOG) == -1) {

perror("listen")

exit(1)

}

sigemptyset(&sa.sa_mask)

sa.sa_flags = SA_RESTART

if (sigaction(SIGCHLD, &sa, NULL) == -1) {

perror("sigaction")

exit(1)

}

while(1) { // main accept() loop

sin_size = sizeof(struct sockaddr_in)

if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {

perror("accept")

continue

}

printf("server: got connection from %s\n",inet_ntoa(their_addr.sin_addr))

if (!fork()) { // this is the child process

close(sockfd)// child doesn't need the listener

if (send(new_fd, "Hello, world!\n", 14, 0) == -1)

perror("send")

close(new_fd)

exit(0)

}

close(new_fd)

}

return 0

}

定义个结构体吧：

struct FRAME

{

unsigned char FSB[2]

unsigned char ADDRESS[2]

unsigned char DATA[5]

unsigned char FRAMEEND[2]

}RECEIVEFRAME；

然后每次收到一次数据就在主程序里处理就可以了，协议是否正确无外乎字节长度，还有帧头 帧尾是否正确 还有个CRC校验

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