您的位置：首页 > 理论基础 > 计算机网络

TCP IP网络编程2 简单的Web服务器

2016-04-25 18:04 375 查看

实现简单的web服务器有三种处理请求的方式：

多进程、多线程和I/O复用

下面利用多线程处理连接的请求，每个连接新增一个线程来处理

返回静态文件，不存在则返回400

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

#define BUF_SIZE 1024
#define SMALL_BUF 100

void *request_handler(void *arg);
void send_data(FILE *fp, char *ct, char *file_name);
char *content_type(char *file);
void send_error(FILE *fp);
void error_handling(char *message);
long get_filesize(char *path);

int main(int argc, char *argv[])
{
int serv_sock, clnt_sock;
struct sockaddr_in serv_adr, clnt_adr;
int clnt_adr_size;
char buf[BUF_SIZE];
pthread_t t_id;

if(argc != 2)
{
printf("Usage : %s <port>\n", argv[0]);
exit(1);
}

serv_sock = socket(PF_INET, SOCK_STREAM, 0);
if(serv_sock == -1)
error_handling("socket() error");

memset(&serv_adr, 0, sizeof(serv_adr));
serv_adr.sin_family = AF_INET;
serv_adr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_adr.sin_port = htons(atoi(argv[1]));

if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr)) == -1)
error_handling("bind() error");
if(listen(serv_sock, 20) == -1)
error_handling("listen() error");

while(1)
{
clnt_adr_size = sizeof(clnt_adr);
clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_adr, &clnt_adr_size);
printf("Connection Request: %s:%d\n",
inet_ntoa(clnt_adr.sin_addr), ntohs(clnt_adr.sin_port));
pthread_create(&t_id, NULL, request_handler, &clnt_sock);
pthread_detach(t_id);
}

close(serv_sock);

return 0;
}

void *request_handler(void *arg)
{
int clnt_sock = *(int *)arg;
char req_line[SMALL_BUF];
FILE *clnt_read;
FILE *clnt_write;

char method[10];
char ct[15];
char file_name[30];

clnt_read = fdopen(clnt_sock, "r");
clnt_write = fdopen(dup(clnt_sock), "w");
fgets(req_line, SMALL_BUF, clnt_read);
if(strstr(req_line, "HTTP/") == NULL)
{
send_error(clnt_write);
fclose(clnt_read);
fclose(clnt_write);
return;
}

strcpy(method, strtok(req_line, " /"));
strcpy(file_name, strtok(NULL, " /"));
strcpy(ct, content_type(file_name));
if(strcmp(method, "GET") != 0)
{
send_error(clnt_write);
fclose(clnt_read);
fclose(clnt_write);
return;
}

fclose(clnt_read);
send_data(clnt_write, ct, file_name);
}

void send_data(FILE *fp, char *ct, char *file_name)
{
char protocol[] = "HTTP/1.1 200 OK\r\n";
char server[] = "Server: Linux Web Server \r\n";
char cnt_len[30] = {'\0'};
char cnt_type[SMALL_BUF];
char buf[BUF_SIZE];
FILE *send_file;

sprintf(cnt_type, "Content-type:%s\r\n\r\n", ct);
send_file = fopen(file_name, "r");
if(send_file == NULL)
{
send_error(fp);
return;
}

sprintf(cnt_len, "Content-length:%ld\r\n", get_filesize(file_name));
fputs(protocol, fp);
fputs(server, fp);
fputs(cnt_len, fp);
fputs(cnt_type, fp);

while(fgets(buf, BUF_SIZE, send_file) != NULL)
{
fputs(buf, fp);
fflush(fp);
}
fflush(fp);
fclose(fp);
}

char *content_type(char *file)
{
char extension[SMALL_BUF];
char file_name[SMALL_BUF];
strcpy(file_name, file);
strtok(file_name, ".");
strcpy(extension, strtok(NULL, "."));

if(!strcmp(extension, "html") || !strcmp(extension, "htm"))
return "text/html";
else
return "text/plain";
}

void send_error(FILE *fp)
{
char protocol[] = "HTTP/1.1 400 Bad Request\r\n";
char server[] = "Server:Linux Web Server \r\n";
char cnt_len[30] = {'\0'};
char cnt_type[] = "Content-type:text/html\r\n\r\n";
char content[] = "<html><head><title>Network</title></head>"
"<body><font size=+5><br>Error occurred, please check the file name!"
"</font></body></html>";

sprintf(cnt_len, "Content-length:%d\r\n", sizeof(content));
fputs(protocol, fp);
fputs(server, fp);
fputs(cnt_len, fp);
fputs(cnt_type, fp);
fputs(content, fp);
fflush(fp);
fclose(fp);
}

void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}

long get_filesize(char *path)
{
struct stat statbuff;
if(stat(path, &statbuff) == -1)
return -1;

return statbuff.st_size;
}

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航