简单的在TCP协议下实现服务器与客户端之间的通信（Socket函数很重要）
2018-02-05 15:07
337 查看
服务器端
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <pthread.h>
#define portnumber 3333
struct online
{
char name[100];
int fd;
struct online *next;
};
struct online *head;
struct message
{
char name[100];
char passwd[100];
char to_name[100];
char to_msg[100];
int action;
};
int insert_node(struct online *newnode)
{
if(head == NULL)
{
newnode->next = NULL;
head = newnode;
return 0;
}
struct online *temp = head;
while(temp->next != NULL)
{
temp = temp->next;
}
temp->next = newnode;
newnode->next = NULL;
return 0;
}
int find_node(char *name)
{
if(head == NULL)
{
return -1;
}
struct online *temp = head;
while(temp != NULL)
{
if(strcmp(temp->name,name) == 0)
{
return temp->fd;
}
temp = temp->next;
}
return -1;
}
void * read_client(void *arg)
{
int nbytes;
int fd;
int new_fd = *((int *)arg);
struct message *msg = (struct message *)malloc(sizeof(struct message));
struct online *ptr = (struct online *)malloc(sizeof(struct online));
while((nbytes=read(new_fd,msg,sizeof(struct message))) > 0)
{
switch(msg->action)
{
case 1:
{
memset(ptr,0,sizeof(struct online));
printf("log ok!\n");
msg->action = -1;
strcpy(ptr->name,msg->name);
ptr->fd = new_fd;
insert_node(ptr);
write(new_fd,msg,sizeof(struct message));
break;
}
case -1:
{
printf("log no!\n");
break;
}
case 3:
{
printf("read message!\n");
fd = find_node(msg->to_name);
write(fd,msg,sizeof(struct message));
break;
}
}
}
}
int main(int argc, char *argv[])
{
int pthread_id;
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int ret;
int nbytes;
char buffer[1024];
int opt = 1; /* 套接字选项 */
head = NULL;
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(portnumber);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
exit(1);
}
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
exit(1);
}
while(1)
{
sin_size=sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
{
fprintf(stderr,"Accept err
4000
or:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr)); // 将网络地址转换成.字符串
ret = pthread_create(&pthread_id,NULL,(void *)read_client,(void *)&new_fd);
if(ret)
{
printf("pthread error!\n"){}
}
}
/* 结束通讯 */
close(sockfd);
exit(0);
}
客户端
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <pthread.h>
#define portnumber 3333
struct message
{
char name[100];
char passwd[100];
char to_name[100];
char to_msg[100];
int action;
};
void welcome()
{
printf("\t\t/**********welcome to my mimi_chat!*****************/\n");
printf("\t\t/**********input log login*************************/\n");
printf("\t\t/**********input reg register**********************/\n");
printf("\t\t/**********input sto send to one*******************/\n");
printf("\t\t/**********input sta send to all*******************/\n");
printf("\t\t/**********input exit eixt system*******************/\n");
}
void * read_server(void *arg)
{
int fd = *((int *)arg);
int nbytes;
struct message *msg = (struct message *)malloc(sizeof(struct message));
while((nbytes=read(fd,msg,sizeof(struct message))) > 0)
{
switch(msg->action)
{
case 1:
{
printf("log ok!\n");
break;
}
case -1:
{
printf("log no!\n");
break;
}
case 3:
{
printf("%s send to message to me:%s!\n",msg->name,msg->to_msg);
break;
}
}
}
}
int main(int argc, char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int pthread_id;
struct message *msg = (struct message *)malloc(sizeof(struct message));
if(argc!=2)
{
fprintf(stderr,"Usage:%s hostname \a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
{
fprintf(stderr,"Gethostname error\n");
exit(1);
}
/* 客户程序开始建立 sockfd描述符 */
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) // AF_INET:Internet;SOCK_STREAM:TCP
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
/* 客户程序填充服务端的资料 */
bzero(&server_addr,sizeof(server_addr)); // 初始化,置0
server_addr.sin_family=AF_INET; // IPV4
server_addr.sin_port=htons(portnumber); // (将本机器上的short数据转化为网络上的short数据)端口号
server_addr.sin_addr=*((struct in_addr *)host->h_addr); // IP地址
//welcome();
/* 客户程序发起连接请求 */
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
exit(1);
}
pthread_create(&pthread_id,NULL,(void *)read_server,(void *)&sockfd);
char input[1024];
welcome();
/* 发送数据 */
while(1)
{
printf("Please input command:\n");
memset(input,0,1024);
scanf("%s",input);
if(strcmp(input,"log") == 0)
{
msg->action = 1;
printf("Please input name:\n");
scanf("%s",msg->name);
printf("Please input password:\n");
scanf("%s",msg->passwd);
write(sockfd,msg,sizeof(struct message));
}
if(strcmp(input,"sto") == 0)
{
msg->action = 3;
printf("Please input to name:\n");
scanf("%s",msg->to_name);
printf("Please input to message:\n");
scanf("%s",msg->to_msg);
write(sockfd,msg,sizeof(struct message));
}
if(strcmp(input,"sta") == 0)
{
}
if(strcmp(input,"exit") == 0)
{
}
}
/* 结束通讯 */
close(sockfd);
exit(0);
}
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <pthread.h>
#define portnumber 3333
struct online
{
char name[100];
int fd;
struct online *next;
};
struct online *head;
struct message
{
char name[100];
char passwd[100];
char to_name[100];
char to_msg[100];
int action;
};
int insert_node(struct online *newnode)
{
if(head == NULL)
{
newnode->next = NULL;
head = newnode;
return 0;
}
struct online *temp = head;
while(temp->next != NULL)
{
temp = temp->next;
}
temp->next = newnode;
newnode->next = NULL;
return 0;
}
int find_node(char *name)
{
if(head == NULL)
{
return -1;
}
struct online *temp = head;
while(temp != NULL)
{
if(strcmp(temp->name,name) == 0)
{
return temp->fd;
}
temp = temp->next;
}
return -1;
}
void * read_client(void *arg)
{
int nbytes;
int fd;
int new_fd = *((int *)arg);
struct message *msg = (struct message *)malloc(sizeof(struct message));
struct online *ptr = (struct online *)malloc(sizeof(struct online));
while((nbytes=read(new_fd,msg,sizeof(struct message))) > 0)
{
switch(msg->action)
{
case 1:
{
memset(ptr,0,sizeof(struct online));
printf("log ok!\n");
msg->action = -1;
strcpy(ptr->name,msg->name);
ptr->fd = new_fd;
insert_node(ptr);
write(new_fd,msg,sizeof(struct message));
break;
}
case -1:
{
printf("log no!\n");
break;
}
case 3:
{
printf("read message!\n");
fd = find_node(msg->to_name);
write(fd,msg,sizeof(struct message));
break;
}
}
}
}
int main(int argc, char *argv[])
{
int pthread_id;
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int ret;
int nbytes;
char buffer[1024];
int opt = 1; /* 套接字选项 */
head = NULL;
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket error:%s\n\a",strerror(errno));
exit(1);
}
bzero(&server_addr,sizeof(struct sockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(portnumber);
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Bind error:%s\n\a",strerror(errno));
exit(1);
}
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"Listen error:%s\n\a",strerror(errno));
exit(1);
}
while(1)
{
sin_size=sizeof(struct sockaddr_in);
if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1)
{
fprintf(stderr,"Accept err
4000
or:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr)); // 将网络地址转换成.字符串
ret = pthread_create(&pthread_id,NULL,(void *)read_client,(void *)&new_fd);
if(ret)
{
printf("pthread error!\n"){}
}
}
/* 结束通讯 */
close(sockfd);
exit(0);
}
客户端
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <pthread.h>
#define portnumber 3333
struct message
{
char name[100];
char passwd[100];
char to_name[100];
char to_msg[100];
int action;
};
void welcome()
{
printf("\t\t/**********welcome to my mimi_chat!*****************/\n");
printf("\t\t/**********input log login*************************/\n");
printf("\t\t/**********input reg register**********************/\n");
printf("\t\t/**********input sto send to one*******************/\n");
printf("\t\t/**********input sta send to all*******************/\n");
printf("\t\t/**********input exit eixt system*******************/\n");
}
void * read_server(void *arg)
{
int fd = *((int *)arg);
int nbytes;
struct message *msg = (struct message *)malloc(sizeof(struct message));
while((nbytes=read(fd,msg,sizeof(struct message))) > 0)
{
switch(msg->action)
{
case 1:
{
printf("log ok!\n");
break;
}
case -1:
{
printf("log no!\n");
break;
}
case 3:
{
printf("%s send to message to me:%s!\n",msg->name,msg->to_msg);
break;
}
}
}
}
int main(int argc, char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int pthread_id;
struct message *msg = (struct message *)malloc(sizeof(struct message));
if(argc!=2)
{
fprintf(stderr,"Usage:%s hostname \a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
{
fprintf(stderr,"Gethostname error\n");
exit(1);
}
/* 客户程序开始建立 sockfd描述符 */
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) // AF_INET:Internet;SOCK_STREAM:TCP
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
/* 客户程序填充服务端的资料 */
bzero(&server_addr,sizeof(server_addr)); // 初始化,置0
server_addr.sin_family=AF_INET; // IPV4
server_addr.sin_port=htons(portnumber); // (将本机器上的short数据转化为网络上的short数据)端口号
server_addr.sin_addr=*((struct in_addr *)host->h_addr); // IP地址
//welcome();
/* 客户程序发起连接请求 */
if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
exit(1);
}
pthread_create(&pthread_id,NULL,(void *)read_server,(void *)&sockfd);
char input[1024];
welcome();
/* 发送数据 */
while(1)
{
printf("Please input command:\n");
memset(input,0,1024);
scanf("%s",input);
if(strcmp(input,"log") == 0)
{
msg->action = 1;
printf("Please input name:\n");
scanf("%s",msg->name);
printf("Please input password:\n");
scanf("%s",msg->passwd);
write(sockfd,msg,sizeof(struct message));
}
if(strcmp(input,"sto") == 0)
{
msg->action = 3;
printf("Please input to name:\n");
scanf("%s",msg->to_name);
printf("Please input to message:\n");
scanf("%s",msg->to_msg);
write(sockfd,msg,sizeof(struct message));
}
if(strcmp(input,"sta") == 0)
{
}
if(strcmp(input,"exit") == 0)
{
}
}
/* 结束通讯 */
close(sockfd);
exit(0);
}
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