3 * Copyright (C) 2001-2003 Simone Piccardi
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or (at
8 * your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /****************************************************************
22 * Simple TCP client for echo service (port 7)
24 * Author: Simone Piccardi
27 * Usage: echo -h give all info's
29 * $Id: TCP_echo.c,v 1.8 2003/08/17 23:03:44 piccardi Exp $
31 ****************************************************************/
33 * Include needed headers
35 #include <sys/types.h> /* predefined types */
36 #include <unistd.h> /* include unix standard library */
37 #include <arpa/inet.h> /* IP addresses conversion utiliites */
38 #include <sys/socket.h> /* socket library */
39 #include <stdio.h> /* include standard I/O library */
40 #include <errno.h> /* include error codes */
41 #include <string.h> /* include erroro strings definitions */
45 void ClientEcho(FILE * filein, int socket);
46 void SigTERM_hand(int sig);
49 int main(int argc, char *argv[])
52 * Variables definition
56 struct sockaddr_in serv_add;
59 * Input section: decode parameters passed in the calling
62 opterr = 0; /* don't want writing to stderr */
63 while ( (i = getopt(argc, argv, "hr")) != -1) {
69 printf("Wrong -h option use\n");
76 case '?': /* unrecognized options */
77 printf("Unrecognized options -%c\n",optopt);
79 default: /* should not reached */
83 /* ***********************************************************
85 * Options processing completed
89 * ***********************************************************/
91 if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
92 perror("Socket creation error");
95 /* initialize address */
96 memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
97 serv_add.sin_family = AF_INET; /* address type is INET */
98 serv_add.sin_port = htons(7); /* echo port is 7 */
99 /* build address using inet_pton */
100 if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
101 perror("Address creation error");
104 /* extablish connection */
105 if (connect(sock, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
106 perror("Connection error");
109 /* check if resetting on close is required */
111 printf("Setting reset on close \n");
114 if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
115 perror("Cannot set linger");
119 /* do read/write operations */
120 ClientEcho(stdin, sock);
125 * routine to print usage info and exit
128 printf("Take daytime from a remote host \n");
130 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
131 // printf(" -v set verbosity on\n");
132 printf(" -r require reset on closing\n");
133 printf(" -h print this help\n");
137 void ClientEcho(FILE * filein, int socket)
139 char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
141 while (fgets(sendbuff, MAXLINE, filein) != NULL) {
142 nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
144 printf("Errore in scrittura: %s", strerror(errno));
147 nread = read(socket, recvbuff, strlen(sendbuff));
149 printf("Errore in lettura: %s\n", strerror(errno));
153 printf("EOF sul socket\n");
157 if (fputs(recvbuff, stdout) == EOF) {
158 perror("Errore in scrittura su terminale");