115 lines
2.4 KiB
C++
115 lines
2.4 KiB
C++
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// remote_server.c -- Written by Curtis Olson
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// -- for CSci 5502
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h> // bind
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#include <netinet/in.h>
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#include <unistd.h>
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#include <iostream>
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// #include <netdb.h>
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// #include <fcntl.h>
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// #include <stdio.h>
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#define MAXBUF 1024
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int make_socket (unsigned short int* port) {
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int sock;
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struct sockaddr_in name;
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socklen_t length;
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// Create the socket.
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sock = socket (PF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror ("socket");
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exit (EXIT_FAILURE);
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}
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// Give the socket a name.
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name.sin_family = AF_INET;
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name.sin_addr.s_addr = INADDR_ANY;
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name.sin_port = 0 /* htons (port) */;
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name.sin_addr.s_addr = htonl (INADDR_ANY);
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if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {
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perror ("bind");
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exit (EXIT_FAILURE);
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}
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// Find the assigned port number
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length = sizeof(struct sockaddr_in);
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if ( getsockname(sock, (struct sockaddr *) &name, &length) ) {
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perror("Cannot get socket's port number");
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}
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*port = ntohs(name.sin_port);
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return sock;
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}
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main() {
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int sock, msgsock, length, pid;
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fd_set ready;
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short unsigned int port;
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char buf[MAXBUF];
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sock = make_socket( &port );
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// Save the port number
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// set_port( port );
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cout << "socket is connected to port = " << port << endl;
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/* Specify the maximum length of the connection queue */
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listen(sock, 3);
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for ( ;; ) {
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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/* block until we get some input on sock */
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select(32, &ready, 0, 0, NULL);
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if ( FD_ISSET(sock, &ready) ) {
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/* printf("%d %d Incomming message --> ", getpid(), pid); */
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msgsock = accept(sock, 0, 0);
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/* spawn a child */
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pid = fork();
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if ( pid < 0 ) {
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/* error */
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perror("Cannot fork child process");
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exit(-1);
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} else if ( pid > 0 ) {
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/* This is the parent */
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close(msgsock);
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} else {
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/* This is the child */
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cout << "new process started to handle new connection" << endl;
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// Read client's message
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while ( (length = read(msgsock, buf, MAXBUF)) > 0) {
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cout << "buffer length = " << length << endl;
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buf[length] = '\0';
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cout << "Incoming command -> " << buf;
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// reply to the client
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if ( write(sock, message, sizeof(message)) < 0 ) {
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perror("Cannot write to stream socket");
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}
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}
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cout << "process ended" << endl;
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exit(0);
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}
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}
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}
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}
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