+/* TCP_echo.c
+ *
+ * Copyright (C) 2001-2003 Simone Piccardi
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Program TCP_echo.c
+ * Simple TCP client for echo service (port 7)
+ *
+ * Author: Simone Piccardi
+ * Jun. 2001
+ *
+ * Usage: echo -h give all info's
+ *
+ * $Id: TCP_echo.c,v 1.11 2003/10/20 22:44:16 piccardi Exp $
+ *
+ ****************************************************************/
+/*
+ * Include needed headers
+ */
+#include <sys/types.h> /* predefined types */
+#include <unistd.h> /* include unix standard library */
+#include <arpa/inet.h> /* IP addresses conversion utiliites */
+#include <sys/socket.h> /* socket library */
+#include <stdio.h> /* include standard I/O library */
+#include <errno.h> /* include error codes */
+#include <string.h> /* include erroro strings definitions */
+
+#include "macros.h"
+
+#define MAXLINE 256
+void usage(void);
+void ClientEcho(FILE * filein, int socket);
+void SigTERM_hand(int sig);
+
+/* Program begin */
+int main(int argc, char *argv[])
+{
+/*
+ * Variables definition
+ */
+ int sock, i;
+ int reset = 0;
+ struct sockaddr_in serv_add;
+ struct linger ling;
+ /*
+ * Input section: decode parameters passed in the calling
+ * Use getopt function
+ */
+ opterr = 0; /* don't want writing to stderr */
+ while ( (i = getopt(argc, argv, "hr")) != -1) {
+ switch (i) {
+ /*
+ * Handling options
+ */
+ case 'h':
+ printf("Wrong -h option use\n");
+ usage();
+ return(1);
+ break;
+ case 'r':
+ reset = 1;
+ break;
+ case '?': /* unrecognized options */
+ printf("Unrecognized options -%c\n",optopt);
+ usage();
+ default: /* should not reached */
+ usage();
+ }
+ }
+ /* ***********************************************************
+ *
+ * Options processing completed
+ *
+ * Main code beginning
+ *
+ * ***********************************************************/
+ /* create socket */
+ if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+ perror("Socket creation error");
+ return 1;
+ }
+ /* initialize address */
+ memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
+ serv_add.sin_family = AF_INET; /* address type is INET */
+ serv_add.sin_port = htons(7); /* echo port is 7 */
+ /* build address using inet_pton */
+ if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
+ perror("Address creation error");
+ return 1;
+ }
+ /* extablish connection */
+ if (connect(sock, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
+ perror("Connection error");
+ return 1;
+ }
+ /* check if resetting on close is required */
+ if (reset) {
+ printf("Setting reset on close \n");
+ ling.l_onoff = 1;
+ ling.l_linger = 0;
+ if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
+ perror("Cannot set linger");
+ exit(1);
+ }
+ }
+ /* do read/write operations */
+ ClientEcho(stdin, sock);
+ /* normal exit */
+ return 0;
+}
+/*
+ * routine to print usage info and exit
+ */
+void usage(void) {
+ printf("Take daytime from a remote host \n");
+ printf("Usage:\n");
+ printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
+// printf(" -v set verbosity on\n");
+ printf(" -r require reset on closing\n");
+ printf(" -h print this help\n");
+ exit(1);
+}
+
+void ClientEcho(FILE * filein, int socket)
+{
+ char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
+ int nread, nwrite;
+ int maxfd;
+ fd_set fset;
+ int eof = 0;
+ /* initialize file descriptor set */
+ FD_ZERO(&fset);
+ maxfd = max(fileno(filein), socket) + 1;
+ while (1) {
+ FD_SET(socket, &fset); /* set for the socket */
+ if (eof == 0) {
+ FD_SET(fileno(filein), &fset); /* set for the standard input */
+ }
+ select(maxfd, &fset, NULL, NULL, NULL); /* wait for read ready */
+ if (FD_ISSET(fileno(filein), &fset)) { /* if ready on stdin */
+ if (fgets(sendbuff, MAXLINE, filein) == NULL) { /* if no input */
+ eof = 1; /* EOF on input */
+ shutdown(socket, SHUT_WR); /* close write half */
+ FD_CLR(fileno(filein), &fset); /* no more interest on stdin */
+ } else { /* else we have to write to socket */
+ nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
+ if (nwrite < 0) { /* on error stop */
+ printf("Errore in scrittura: %s", strerror(errno));
+ return;
+ }
+ }
+ }
+ if (FD_ISSET(socket, &fset)) { /* if ready on socket */
+ nread = read(socket, recvbuff, strlen(sendbuff)); /* do read */
+ if (nread < 0) { /* error condition, stop client */
+ printf("Errore in lettura: %s\n", strerror(errno));
+ return;
+ }
+ if (nread == 0) { /* server closed connection, stop */
+ if (eof == 1) {
+ return;
+ } else {
+ printf("EOF prematuro sul socket\n");
+ return;
+ }
+ }
+ recvbuff[nread] = 0; /* else read is ok, write on stdout */
+ if (fputs(recvbuff, stdout) == EOF) {
+ perror("Errore in scrittura su terminale");
+ return;
+ }
+ }
+ }
+}
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