sock_lib.c

linux下开发的web服务器

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <time.h>
#include <string.h>

#define HOSTLEN 			256
#define MAX_QUE_CONN_NM		5

int make_server_socket_q(int, int);




int make_server_socket(int portnum)
{
	return make_server_socket_q(portnum, BACKLOG);
}

int make_server_socket_q(int portnum, int backlog)
{
	struct sockaddr_in saddr;
	struct hostent *hp;
	char hostname[HOSTLEN];
	int sock_id;
	
	sock_id = socket(PF_INET, SOCK_STREAM, 0);
	if(sock_id == -1)
		return -1;
		
	bzero((void *)&saddr, sizeof(saddr));
	gethostname(hostname, HOSTLEN);
	saddr.sin_port = htons(portnum);
	saddr.sin_family = AF_INET;
	if(bind(sock_id, (struct sockaddr *)&saddr, sizeof(saddr)) != 0)
		return -1;
		
	if(listen(sock_id, backlog) != 0)
		return -1;
	return sock_id;		
}

int start_server(int portnum)
{
	struct sockaddr_in server_sockaddr, client_sockaddr;
	int sin_size, recvbytes;		
	int sockfd, client_fd;	
	char buf[BUFFER_SIZE];	

	/*建立socket连接*/
	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		perror("socket");
		return -1;
	}
	/*设置sockaddr_in 结构体中相关参数*/
	server_sockaddr.sin_family = AF_INET;	
	server_sockaddr.sin_port = htons(portnum);	
	server_sockaddr.sin_addr.s_addr = INADDR_ANY;		
	bzero(&(server_sockaddr.sin_zero), 8);		
	int i = 1;/* 使得重复使用本地地址与套接字进行绑定 */		
	setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
	/* 调用绑定函数 */
	if (bind(sockfd, (struct sockaddr *)&server_sockaddr, sizeof(struct sockaddr)) == -1)
	{
		perror("bind");
		return -1;
	}
	if (listen(sockfd, MAX_QUE_CONN_NM) == -1) /* 调用listen函数*/
	{
		perror("listen");
		return -1;
	}
	return sockfd;
}



int connet_to_server(char *host, int portnum)
{
	int sock;
	struct sockaddr_in servadd;
	struct hostent *hp;
	
	sock = socket(AF_INET, SOCK_STREAM, 0);
	if(sock == -1)
		return -1;
		
	bzero(&servadd, sizeof(servadd));
	hp = gethostbyname(host);
	if(hp == NULL)
		return -1;
	bcopy(hp->h_addr, (struct sockaddr *)&servadd.sin_addr, hp->h_length);
	servadd.sin_port = htons(portnum);
	servadd.sin_family = AF_INET;
	
	if(connect(sock, (struct sockaddr *)&servadd, sizeof(servadd)) != 0)
		return -1;
	return sock;		
}