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 1.11 2003/10/20 22:44:16 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 */
49 void ClientEcho(FILE * filein, int socket);
50 void SigTERM_hand(int sig);
53 int main(int argc, char *argv[])
56 * Variables definition
62 * Input section: decode parameters passed in the calling
65 opterr = 0; /* don't want writing to stderr */
66 while ( (i = getopt(argc, argv, "hr")) != -1) {
72 printf("Wrong -h option use\n");
79 case '?': /* unrecognized options */
80 printf("Unrecognized options -%c\n",optopt);
82 default: /* should not reached */
86 /* ***********************************************************
88 * Options processing completed
92 * ***********************************************************/
93 /* call sockaddr to get a connected socket */
94 if ( (sock = sockconn(argv[optind], "echo", 6, SOCK_STREAM)) < 0) {
95 if (errno) perror("Socket creation error");
98 /* check if resetting on close is required */
100 printf("Setting reset on close \n");
103 if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
104 perror("Cannot set linger");
108 /* do read/write operations */
109 ClientEcho(stdin, sock);
114 * routine to print usage info and exit
117 printf("Take daytime from a remote host \n");
119 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
120 // printf(" -v set verbosity on\n");
121 printf(" -r require reset on closing\n");
122 printf(" -h print this help\n");
126 void ClientEcho(FILE * filein, int socket)
128 char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
133 /* initialize file descriptor set */
135 maxfd = max(fileno(filein), socket) + 1;
137 FD_SET(socket, &fset); /* set for the socket */
139 FD_SET(fileno(filein), &fset); /* set for the standard input */
141 select(maxfd, &fset, NULL, NULL, NULL); /* wait for read ready */
142 if (FD_ISSET(fileno(filein), &fset)) { /* if ready on stdin */
143 if (fgets(sendbuff, MAXLINE, filein) == NULL) { /* if no input */
144 eof = 1; /* EOF on input */
145 shutdown(socket, SHUT_WR); /* close write half */
146 FD_CLR(fileno(filein), &fset); /* no more interest on stdin */
147 } else { /* else we have to write to socket */
148 nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
149 if (nwrite < 0) { /* on error stop */
150 printf("Errore in scrittura: %s", strerror(errno));
155 if (FD_ISSET(socket, &fset)) { /* if ready on socket */
156 nread = read(socket, recvbuff, strlen(sendbuff)); /* do read */
157 if (nread < 0) { /* error condition, stop client */
158 printf("Errore in lettura: %s\n", strerror(errno));
161 if (nread == 0) { /* server closed connection, stop */
165 printf("EOF prematuro sul socket\n");
169 recvbuff[nread] = 0; /* else read is ok, write on stdout */
170 if (fputs(recvbuff, stdout) == EOF) {
171 perror("Errore in scrittura su terminale");