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Listing 3-7
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/* Typical code for sockets on the server side in C language */ #include <stdio.h> /* for EXIT_FAILURE and EXIT_SUCCESS */ #include <stdlib.h> /* network functions */ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> int main() { int socket_desc; struct sockaddr_in address; int addrlen; int new_socket; /* create the master socket and check it worked */ if ((socket_desc=socket(AF_INET,SOCK_STREAM,0))==0) { /* if socket failed then display error and exit */ perror("Create socket"); exit(EXIT_FAILURE); } /* type of socket created */ address.sin_family = AF_INET; address.sin_addr.s_addr = INADDR_ANY; /* 7000 is the port to use for connections */ address.sin_port = htons(7000); /* bind the socket to port 7000 */ if (bind(socket_desc,(struct sockaddr *)&address,sizeof(address))<0) { /* if bind failed then display error message and exit */ perror("bind"); exit(EXIT_FAILURE); } /* try to specify maximum of 3 pending connections for the master socket */ if (listen(socket_desc,3)<0) { /* if listen failed then display error and exit */ perror("listen"); exit(EXIT_FAILURE); } /* accept one connection, wait if no connection pending */ addrlen=sizeof(address); if ((new_socket=accept(socket_desc,(struct sockaddr *) &address, &addrlen))<0) { /* if accept failed to return a socket descriptor, display error and exit */ perror("accept"); exit(EXIT_FAILURE); } /* inform user of socket number - used in send and receive commands */ printf("New socket is %d\n",new_socket);
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sleep(10); /* shutdown master socket properly */ close(socket_desc); }
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The flow of code is summarized in Figure 3.4. The basic sequence is that first a socket is created by invoking the socket() method. The type of socket address family needs to be specified. In our case, the address family is AF_INET, which is suitable if TCP is used. This address family provides interprocess communications between processes that run on the same system or on different systems. Addresses for AF_INET sockets are IP addresses and a port number. In the code listing, the port number is 4000. This is the port where the server side will listen for incoming requests. We also specify that the incoming call could be from any machine on the network. Next, we bind the listener to the port by using the bind method. The next step is to accept the connection request from the client. Now both the client and the server can read and write from the socket. After exchanging data, the server finally closes the socket using the close method. The client-side code is similar to the server-side code and is shown in Listing 3-8. The flow of the code is summarized in Figure 3.5. First, a socket is created. Then the IP address and the port of the server are specified. The next step is to make the connection by using the connect() method. Now the client is ready to read from and write to the socket and thus exchange data with the server.
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Listing 3-8
/* Typical client side code for the sockets in C language */ include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> void error(char *msg) { perror(msg); exit(0); } int main(int argc, char *argv[]) { int sockfd, portno, n; struct sockaddr_in serv_addr; struct hostent *server; char buffer[256]; if (argc < 3) { fprintf(stderr,"usage %s hostname port\n", argv[0]); exit(0); } portno = atoi(argv[2]); sockfd = socket(AF_INET, SOCK_STREAM, 0); if (sockfd < 0) error("ERROR opening socket"); server = gethostbyname(argv[1]); if (server == NULL) { fprintf(stderr,"ERROR, no such host\n"); exit(0); } bzero((char *) &serv_addr, sizeof(serv_addr)); serv_addr.sin_family = AF_INET; bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length); serv_addr.sin_port = htons(portno); if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0) error("ERROR connecting"); printf("Please enter the message: "); bzero(buffer,256); fgets(buffer,255,stdin); n = write(sockfd,buffer,strlen(buffer)); if (n < 0) error("ERROR writing to socket"); bzero(buffer,256); n = read(sockfd,buffer,255); if (n < 0) error("ERROR reading from socket"); printf("%s\n",buffer); return 0; }
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