1 /* SimpleEchoTCPClient.c
3 * Copyright (C) 2001 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: SimpleEchoTCPClient.c,v 1.4 2001/09/09 22:45:34 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 */
45 void EchoClient(FILE * filein, int socket);
48 int main(int argc, char *argv[])
51 * Variables definition
54 struct sockaddr_in serv_add;
56 * Input section: decode parameters passed in the calling
59 opterr = 0; /* don't want writing to stderr */
60 while ( (i = getopt(argc, argv, "h")) != -1) {
66 printf("Wrong -h option use\n");
70 case '?': /* unrecognized options */
71 printf("Unrecognized options -%c\n",optopt);
73 default: /* should not reached */
77 /* ***********************************************************
79 * Options processing completed
83 * ***********************************************************/
85 if ( (sock_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
86 perror("Socket creation error");
89 /* initialize address */
90 memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
91 serv_add.sin_family = AF_INET; /* address type is INET */
92 serv_add.sin_port = htons(7); /* echo port is 7 */
93 /* build address using inet_pton */
94 if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
95 perror("Address creation error");
98 /* extablish connection */
99 if (connect(sock_fd, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
100 perror("Connection error");
103 /* read daytime from server */
104 EchoClient(stdin, sock_fd);
109 * routine to print usage info and exit
112 printf("Take daytime from a remote host \n");
114 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
115 printf(" -v set verbosity on\n");
116 printf(" -h print this help\n");
120 void EchoClient(FILE * filein, int socket)
122 char sendbuff[MAXLINE], recvbuff[MAXLINE];
124 while (fgets(sendbuff, MAXLINE, filein) != NULL) {
125 SockWrite(socket, sendbuff, strlen(sendbuff));
126 nread = SockRead(socket, recvbuff, strlen(sendbuff));
128 fputs(recvbuff, stdout);