TCP服务器：
TCP_Server.c
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#include<stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define PORTNUMBER 3333
int main(int argc,char*argv[])
{
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int nbytes;
char buffer[1024];
//socket
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket error:%s\n",strerror(errno));
exit(1);
}
//address
bzero(&server_addr,sizeof(structsockaddr_in));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(PORTNUMBER);
//bind
if(bind(sockfd,(structsockaddr *)(&server_addr),sizeof(structsockaddr_in))==-1)
{
fprintf(stderr,"Bind error:%s\n",strerror(errno));
exit(1);
}
//listen
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"Listen error:%s\n",strerror(errno));
exit(1);
}
while(1)
{
sin_size=sizeof(structsockaddr_in);
if((new_fd=accept(sockfd,(structsockaddr *)(&client_addr),&sin_size))==-1)
{
fprintf(stderr,"Accept error:%s\n",strerror(errno));
exit(1);
}
fprintf(stderr,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
if((nbytes=read(new_fd,buffer,1024))==-1)
{
fprintf(stderr,"Read Error:%s\n",strerror(errno));
exit(1);
}
buffer[nbytes]='\0';
printf("Server received %s\n",buffer);
close(new_fd);
}
}
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TCP客户端：
TCP_client.c
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#include<stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#define PORTNUMBER 3333
int main(int argc,char*argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent*host;
//使用hostent查询host name
if(argc!=2)
{
fprintf(stderr,"Uage:%s hostname\a\n",argv[0]);
exit(1);
}
if((host=gethostbyname(argv[1]))==NULL)
fprintf(stderr,"Gethostname error\n");
exit(1);
}
//socket
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)
{
fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
exit(1);
}
//ip port
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_port=htons(PORTNUMBER);
server_addr.sin_addr=*((structin_addr *)host->h_addr);
//connect
if(connect(sockfd,(structsockaddr *)(&server_addr),sizeof(structsockaddr_in))==-1)
{
fprintf(stderr,"Connect error:%s\a\n",strerror(errno));
exit(1);
}
printf("Please input char:\n");
fgets(buffer,1024,stdin);
write(sockfd,buffer,strlen(buffer));
close(sockfd);
exit(0);
}
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--------------**************分割线***************-------------------
UDP服务器：
udp_server.c
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1 #include <stdlib.h>
2 #include<stdio.h>
3 #include<errno.h>
4 #include<string.h>
5 #include<unistd.h>
6 #include<netdb.h>
7 #include<sys/socket.h>
8 #include<netinet/in.h>
9 #include<arpa/inet.h>
10 #include<sys/types.h>
11
12 #define SERVER_PORT 8888
13 #define MAX_MSG_SIZE 1024
14
15 void udps_respon(int sockfd)
16 {
17 struct sockaddr_in addr;
18 int addrlen,n;
19 char msg[MAX_MSG_SIZE];
20
21 while(1)
22 {
23 bzero(msg,sizeof(msg));
24 addrlen=sizeof(structsockaddr);
25 n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0,(structsockaddr *)&addr,&addrlen);
26 msg[n]='\0';
27 fprintf(stdout,"Server have received %s",msg);
28 }
29 }
30
31
32 int main(void)
33 {
34 int sockfd;
35 struct sockaddr_in addr;
36
37 //socket
38 sockfd=socket(AF_INET,SOCK_DGRAM,0);
39 if(sockfd<0)
40 {
41 fprintf(stderr,"Socket Error:%s\n",strerror(errno));
42 exit(1);
43 }
44
45 //ip port
46 bzero(&addr,sizeof(structsockaddr_in));
47 addr.sin_family=AF_INET;
48 addr.sin_addr.s_addr=htonl(INADDR_ANY);
49 addr.sin_port=htons(SERVER_PORT);
50
51 //bind
52 if(bind(sockfd,(structsockaddr *)&addr,sizeof(structsockaddr_in))<0)
53 {
54 fprintf(stderr,"Bind Error:%s\n",strerror(errno));
55 exit(1);
56 }
57 udps_respon(sockfd);
58 close(sockfd);
59 }
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UDP客户端：
udp_client.c
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1 #include <stdlib.h>
2 #include<stdio.h>
3 #include<errno.h>
4 #include<string.h>
5 #include<netdb.h>
6 #include<sys/types.h>
7 #include<arpa/inet.h>
8 #include<sys/socket.h>
9
10 #define SERVER_PORT 8888
11 #define MAX_BUF_SIZE 1024
12
13 void udpc_requ(int sockfd,conststruct sockaddr_in*addr,int len)
14 {
15 char buffer[MAX_BUF_SIZE];
16 int n;
17 while(1)
18 {
19 printf("please input char:\n");
20 fgets(buffer,MAX_BUF_SIZE+1,stdin);
21 sendto(sockfd,buffer,strlen(buffer),0,(structsockaddr *)addr,len);
22 bzero(buffer,MAX_BUF_SIZE);
23 }
24 }
25
26
27 int main(int argc,char**argv)
28 {
29 int sockfd;
30 struct sockaddr_in addr;
31 struct hostent*host;
32
33 if(argc!=2)
34 {
35 fprintf(stderr,"Usage:%s server_ip\n",argv[0]);
36 exit(1);
37 }
38
39 if((host=gethostbyname(argv[1]))==NULL)
40 {
41 fprintf(stderr,"Gethostname error\n");
42 exit(1);
43 }
44
45 //socket
46 sockfd=socket(AF_INET,SOCK_DGRAM,0);
47 if(sockfd<0)
48 {
49 fprintf(stderr,"Socket Error:%s\n",strerror(errno));
50 exit(1);
51 }
52
53 //ip port
54 bzero(&addr,sizeof(structsockaddr_in));
55 addr.sin_family=AF_INET;
56 addr.sin_port=htons(SERVER_PORT);
57 /* if(inet_aton(argv[1],&addr.sin_addr)<0)
58 {
59 fprintf(stderr,"IP error:%s\n",strerror(errno));
60 exit(1);
61 } */
62 addr.sin_addr=*((structin_addr *)host->h_addr);
63
64
65 udpc_requ(sockfd,&addr,sizeof(structsockaddr_in));
66 close(sockfd);
67 }
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