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 /****************************************************************
21 * Program ElemEchoTCPClient.c
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 1.1 2003/06/23 13:58:36 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 */
43 void ClientEcho(FILE * filein, int socket);
44 void SigTERM_hand(int sig);
47 int main(int argc, char *argv[])
50 * Variables definition
54 struct sockaddr_in serv_add;
57 * Input section: decode parameters passed in the calling
60 opterr = 0; /* don't want writing to stderr */
61 while ( (i = getopt(argc, argv, "hr")) != -1) {
67 printf("Wrong -h option use\n");
74 case '?': /* unrecognized options */
75 printf("Unrecognized options -%c\n",optopt);
77 default: /* should not reached */
81 /* ***********************************************************
83 * Options processing completed
87 * ***********************************************************/
89 if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
90 perror("Socket creation error");
93 /* initialize address */
94 memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
95 serv_add.sin_family = AF_INET; /* address type is INET */
96 serv_add.sin_port = htons(7); /* echo port is 7 */
97 /* build address using inet_pton */
98 if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
99 perror("Address creation error");
102 /* extablish connection */
103 if (connect(sock, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
104 perror("Connection error");
107 /* check if resetting on close is required */
111 if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
112 perror("Cannot set linger");
116 /* read daytime from server */
117 ClientEcho(stdin, sock);
122 * routine to print usage info and exit
125 printf("Take daytime from a remote host \n");
127 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
128 // printf(" -v set verbosity on\n");
129 printf(" -r require reset on closing\n");
130 printf(" -h print this help\n");
134 void ClientEcho(FILE * filein, int socket)
136 char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
138 while (fgets(sendbuff, MAXLINE, filein) != NULL) {
139 FullWrite(socket, sendbuff, strlen(sendbuff));
140 nread = FullRead(socket, recvbuff, strlen(sendbuff));
142 fputs(recvbuff, stdout);