Linux——实现网站发布服务器

1、DNS工作原理
1、 递归式
2、 迭代式

网页发布服务器

1.查看系统的服务程序的状态：
service name status
启动服务：
service name start
关闭服务：
service name stop

2、Linux上html默认存放路径：
/var/www/html

http请求报头：



HTTP应答报文段：



网站发布服务器代码 httpd.c：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <sys/stat.h>

void send_404(int c)
{
char sendbuff[1024] = {0};
strcpy(sendbuff, "HTTP/1.1 404 Not Found\r\n");
strcat(sendbuff, "Server: myhttpd/1.0\r\n");
strcat(sendbuff, "Content-Length: 14\r\n");
strcat(sendbuff, "Content-Type: text/html;charset=gbk\r\n");
strcat(sendbuff, "\r\n");
strcat(sendbuff, "Page Not Found");

send(c, sendbuff, strlen(sendbuff), 0);

}

void senderr(int c)
{
send_404(c);
}

void send_success(int c, int fd)
{
struct stat st;
fstat(fd, &st);

char sendbuff[1024] = {0};
strcpy(sendbuff, "HTTP/1.1 200 OK\r\n");
strcat(sendbuff, "Server: myhttpd/1.0\r\n");

strcat(sendbuff, "Content-Length: ");
sprintf(sendbuff+strlen(sendbuff), "%d", st.st_size);
strcat(sendbuff, "\r\n");

strcat(sendbuff, "Content-Type: text/html;charset=UTF-8\r\n");
strcat(sendbuff, "\r\n");

send(c, sendbuff, strlen(sendbuff), 0);

//fa song wen jian nei rong
while(1)
{
char buff[10] = {0};
int n = read(fd, buff, 9);
if(n <= 0)
{
break;
}
send(c, buff, n, 0);
}

close(fd);
}

void main()
{
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
assert(sockfd != -1);

struct sockaddr_in ser, cli;
memset(&ser, 0, sizeof(ser));
ser.sin_family = AF_INET;
ser.sin_port = htons(80);
ser.sin_addr.s_addr = inet_addr("192.168.1.120");

int res = bind(sockfd, (struct sockaddr*)&ser, sizeof(ser));
assert(res != -1);

listen(sockfd, 5);

while(1)
{
int len = sizeof(cli);
int c = accept(sockfd, (struct sockaddr*)&cli, &len);
assert(c != -1);
printf("one client link\n");

while(1)
{
char buff[1024] = {0};
int n = recv(c, buff, 1023, 0);
if(n <= 0)
{
break;
}
//printf("%s\n", buff);
char *p = strtok(buff, " ");
if(p == NULL)
{
senderr(c);
continue;
}
p = strtok(NULL, " ");
if(p == NULL)
{
senderr(c);
continue;
}

char path[128] = "/var/www/html";
strcat(path, p);
int fd = open(path, O_RDONLY);
if(fd == -1)
{
send_404(c);
continue;
}

//cheng gong, fa song ying da bao wen duan he wen jian nei rong
send_success(c, fd);
}

close(c);
printf("one client unlink\n");
}
}