I'm trying to write a simple TCP client that is able to connect to a server and send and receive messages and commands.
The server is suppose to understand these commands:
AD perform a simple addition
SB perform a simple subtraction
DIV perform a simple division
MUL perform a simple multiplication
IDENT identify the client and itself
QUIT break the current connection and wait for a new one
This is what I got, but there are problems in it. please would anyone have a look and help me out? thank you.
Code:#include<stdio.h> #include<String.h> #include<sys/types.h> #include<sys/socket.h> #include<netinet/in.h> #include<netdb.h> #include<arpa/inet.h> #define MSGSIZE 64/*size of message buffers*/ #define PORT 3550/*server port number*/ main(int args,char*argv[]){ char sendbuf[MSGSIZE];/*send character buffer*/ char recvbuf[MSGSIZE];/*recive character buffer*/ Struct sockaddr_in server;/*internet domain server*/ int sockket;/*socket descriptor*/ int status;/*socket status*/ int numbytes;/*number of bytes of message*/ if(argc!=2){ printf("Usage:%s<IP Address>\n",argv[0]); exit(-1); } /*Server details */ server.sin_family=AF_INET; Server.sin_addr.s_addr=inet_addr(argv[1]); servsr.sin_port=htons(PORT); Printf("valid IP address,connecting to....%s\n",argv[1]); /*connet to server*/ if (status=connect(socket,(struct sockaddr*)&server,sizeof (server))<0){ close(socket); perror("connect"); exit(1); } /*recieve message from server*/ if (numbytes=recv(socket,recvbuf,sizeof(recvbuf),0)<0){ perror("recv"); exit(1); } /*print response from server*/ recvbuf[numbytes]='\0'; printf("%s\n\n",recvbuf); /*Being main loop */ for(; ;){ printf("Input a command(AD,SB,DIV,MUL,IDENT,QUIT)\n"); /*get command from user*/ get(sendbuf); /*send command to server*/ status=send(sock,sendbuf,sizeof(sendbuf),0); if (status<0){ perror("send"); exit(1); } /*recieve message from server*/ numbytes=recv(socket,recvbuf,sizeof(recvbuf),0); if(states<0){ perror("send"); exit(1); } /*Print response frpm server*/ recvbuf[numbytes]='\0'; printf("%s\n\n",recvbuf); if[strncmp(sendbuf,"QUIT",4)==0){ break; } } close(socket); printf("connection closed....\n"); return 0; }
