TCP Server, implementing client Send message, server receiving message

Server.c

#include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <string.h> #include <netinet/in.h> #include <arpa/inet.h> #include <stdlib.h> #include <pthread.h> static void usage (const char *PROC) { printf ("Usage:%s [IP] [port]\n", proc); } void *thread_run (void *arg) { printf ("Create a new thread\n"); int fd= (int) arg; Char buf[1024]; while (1) { memset (buf, ' n ', sizeof (BUF)); ssize_t _s=read (fd,buf,sizeof (BUF)-1); if (_s>0) { buf[_s]= ' + '; printf ("client#%s\n", buf); Write (Fd,buf,strlen (BUF)); }else if (_s==0) { printf ("Client close...\n"); Break }else{ printf ("Read error...\n"); Break } } return (void *) 0; } int main (int argc,char *argv[]) { if (argc!=3) { Usage (argv[0]); Exit (1); } 1. Creat sock int Listen_sock=socket (af_inet,sock_stream,0); if (listen_sock<0) { Perror ("socket"); return 1; } struct SOCKADDR_IN local; Local.sin_family=af_inet; Local.sin_port=htons (Atoi (argv[2)); //Port number LOCAL.SIN_ADDR.S_ADDR=INET_ADDR (argv[1]); //IP Address //2. Bind if (Bind (Listen_sock, (struct sockaddr*) &local,sizeof (local)) <0) { Perror ("bind"); return 2; } //3. Listen Listen (listen_sock,5); //4. Accept struct SOCKADDR_IN peer; Socklen_t len=sizeof (peer); while (1) { int Fd=accept (Listen_sock, (struct sockaddr*) &peer,&len); if (fd<0) { Perror ("accept"); return 3; } printf ("Get a new Link,socket-%s:&d\n", Inet_ntoa (PEER.SIN_ADDR), Ntohs (Peer.sin_port)); pthread_t ID; Pthread_create (&id,null,thread_run, (void*) FD); Pthread_detach (ID); } return 0; }

Client.c

#include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <string.h> #include <netinet/in.h> #include <arpa/inet.h> #include <stdlib.h> #include <pthread.h> static void usage (const char *PROC) { printf ("Usage:%s [IP] [port]\n", proc); } int main (int argc,char *argv[]) { if (argc!=3) { Usage (argv[0]); Exit (1); } int Sock=socket (af_inet,sock_stream,0); if (sock<0) { Perror ("socket"); return 2; } struct SOCKADDR_IN remote; Remote.sin_family=af_inet; Remote.sin_port=htons (Atoi (argv[2)); ARGV[2] REMOTE.SIN_ADDR.S_ADDR=INET_ADDR (argv[1]);//argv[1] if (Connect (sock, struct sockaddr*) &remote,sizeof (remote)) <0) { Perror ("Connect"); return 3; } Char buf[1024]; while (1) { memset (buf, ' n ', sizeof (BUF)); printf ("Please Enter:"); Fflush (stdout); ssize_t _s=read (0,buf,sizeof (BUF)-1); if (_s>0) { buf[_s-1]= ' + '; Write (Sock,buf,strlen (BUF)); _s=read (sock,buf,sizeof (BUF)); if (_s>0) { buf[_s]= ' + '; printf ("%s\n", buf); } } } return 0; }

Makefile File:

. Phony:all All:client Server Client:client.c Gcc-o [email protected] $^-lpthread Server:server.c Gcc-o [email protected] $^-lpthread . Phony:clean Clean RM-F Client Server

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Telnet is a remote terminal protocol

Use the Telnet program on the end user's computer to connect to the server. End users can enter commands in the Telnet program that run on the server as if they were entered directly on the server's console. The server can be controlled locally. To start a Telnet session, you must enter a user name and password to log on to the server. Telnet is a common way to remotely control a Web server.

TCP Server, implementing client Send message, server receiving message