X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2FUDP_echo.c;fp=sources%2FUDP_echo.c;h=8de90878235dc7fee1fd217dfdfbe5a55e31c724;hp=0000000000000000000000000000000000000000;hb=a0184b68ca9dced41be95342ffd8a8ee04d2b861;hpb=9eb4436b75582594619576d54f28073ba027111a

diff --git a/sources/UDP_echo.c b/sources/UDP_echo.c
new file mode 100644
index 0000000..8de9087
--- /dev/null
+++ b/sources/UDP_echo.c
@@ -0,0 +1,149 @@
+/* UDP_echo.c
+ * 
+ * Copyright (C) 2004 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 UDP_echo.c
+ * Simple UDP client for echo service (port 7)
+ *
+ * Author: Simone Piccardi
+ * May 2004
+ *
+ * Usage: echo -h give all info's
+ *
+ * $Id: UDP_echo.c,v 1.1 2004/05/01 17:53:42 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, struct sockaddr_in *serv_add);
+void SigTERM_hand(int sig);
+
+/* Program begin */
+int main(int argc, char *argv[])
+{
+/* 
+ * Variables definition  
+ */
+    int sock, i;
+    struct sockaddr_in serv_add;
+    /*
+     * Input section: decode parameters passed in the calling 
+     * Use getopt function
+     */
+    opterr = 0;	 /* don't want writing to stderr */
+    while ( (i = getopt(argc, argv, "h")) != -1) {
+	switch (i) {
+	/* 
+	 * Handling options 
+	 */ 
+	case 'h':  
+	    printf("Wrong -h option use\n");
+	    usage();
+	    return(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_DGRAM, 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;
+    }
+    /* do read/write operations */
+    ClientEcho(stdin, sock, &serv_add);
+    /* 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, struct sockaddr_in * serv_addr) 
+{
+    char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
+    int nread, nwrite; 
+    /* initialize file descriptor set */
+    while (1) {
+	if (fgets(sendbuff, MAXLINE, filein) == NULL) {
+	    return;                /* if no input just return */
+	} else {                   /* else we have to write to socket */
+	    nwrite = sendto(socket, sendbuff, strlen(sendbuff), 0,
+			    (struct sockaddr *) serv_addr, sizeof(*serv_addr));
+	    if (nwrite < 0) {      /* on error stop */
+		printf("Errore in scrittura: %s", strerror(errno));
+		return;
+	    }
+	}
+	nread = recvfrom(socket, recvbuff, strlen(sendbuff), 0, NULL, NULL); 
+	if (nread < 0) {  /* error condition, stop client */
+	    printf("Errore in lettura: %s\n", strerror(errno));
+	    return;
+	}
+	if (nread == 0) { /* server closed connection, stop */
+	    return;
+	}
+	recvbuff[nread] = 0;   /* else read is ok, write on stdout */
+	if (fputs(recvbuff, stdout) == EOF) {
+	    perror("Errore in scrittura su terminale");
+	    return;
+	}
+    }
+}