write a socket program for echo/ping/talk commands

1 ANSWERS

1. Guest2038
   

   EchoClient.c
   #include<stdio.h>
   #include<stdlib.h>
   #include<errno.h>
   #include<string.h>
   #include<sys/types.h>
   #include<sys/socket.h>
   #include<sys/un.h>
   #include<arpa/inet.h>
   #include<netinet/in.h>
   #define SOCK_PATH "echo_socket"
   int main(void)
   {
   int s1,t,len;
   struct sockaddr_un remote;
   char str[100];
   if((s1=socket(AF_UNIX,SOCK_STREAM,0))==-1)
   {
   printf("socket\n");
   exit(1);
   }
   printf("Trying to connect\n");
   remote.sun_family=AF_UNIX;
   strcpy(remote.sun_path,SOCK_PATH);
   len=strlen(remote.sun_path)+sizeof(remote.sun_family);
   if(connect(s1,(struct sockaddr*)&remote,len)==-1)
   {
   perror("connect");
   exit(1);
   }
   printf("Connectd\n");
   while(printf("->"),fgets(str,100,stdin),!feof(stdin))
   {
   if(send(s1,str,strlen(str),0)==-1)
   {
   perror("send");
   exit(1);
   }
   if((t=recv(s1,str,100,0))>0)
   {
   str[t]='\0';
   printf(" echo->%s",str);
   }
   else
   {
   if(t<0)
   perror("recv");
   else
   printf("server closed connection\n");
   exit(1);
   }
   }
   close(s1);
   return 0;
   }
   
   
   
   
   //EchoServer.c
   #include<stdio.h>
   #include<stdlib.h>
   #include<errno.h>
   #include<string.h>
   #include<sys/types.h>
   #include<sys/socket.h>
   #include<sys/un.h>
   #include<netinet/in.h>
   #include<arpa/inet.h>
   #define SOCK_PATH "echo_socket"
   int main(void)
   {
   int s1,s2,len;
   struct sockaddr_un local;
   struct sockaddr_un remote;
   char str[100];
   if((s1=socket(AF_UNIX,SOCK_STREAM,0))==-1)
   {
   printf("socket\n");
   exit(1);
   }
   local.sun_family=AF_UNIX;
   strcpy(local.sun_path,SOCK_PATH);
   unlink(local.sun_path);
   len=strlen(local.sun_path)+sizeof(local.sun_family);
   if(bind(s1,(struct sockaddr*)&local,len)==-1)
   {
   printf("Bind");
   exit(1);
   }
   if(listen(s1,5)==-1)
   {
   printf("listen");
   exit(1);
   }
   for(;;)
   {
   int done,n,t;
   printf("Waiting for connection\n");
   t=sizeof(remote);
   if((s2=accept(s1,(struct sockaddr*)&remote,&t))==-1)
   {
   perror("accept");
   exit(1);
   }
   printf("Connected\n");
   done=0;
   do
   {
   n=recv(s2,str,100,0);
   if(n<=0)
   {
   if(n<0)
   perror("recv");
   done=1;
   }
   if(!done)
   if(send(s2,str,n,0)<0)
   {
   perror("send");
   done=1;
   }
   }
   while(!done);
   close(s2);
   }
   return 0;
   }
   
   
   
   
   
   
   
   
   
   
   
   //output
   
   [exam01@localhost ~]$ cc EchoServer.c
   EchoServer.c: In function ΓÇÿmainΓÇÖ:
   EchoServer.c:41: warning: pointer targets in passing argument 3 of ΓÇÿacceptΓÇ
   differ in signedness
   [exam01@localhost ~]$ ./a.out 172.16.0.143
   Waiting for connection
   Connected
   
   //output
   [exam01@localhost ~]$ cc EchoClient.c
   [exam01@localhost ~]$ cc EchoClient.c
   [exam01@localhost ~]$ ./a.out 172.16.0.143
   Trying to connect
   Connectd
   ->hiii
   echo->hiii
   ->what u want?
   echo->what u want?
   ->india is my country
   echo->india is my country
   ->

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