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 */
43 #include <netinet/tcp.h>
45 /* still not defined in some include, because too new ... */
46 #ifndef TCP_CONGESTION
47 #define TCP_CONGESTION 13
57 void ClientEcho(FILE * filein, int socket);
58 void SigTERM_hand(int sig);
61 int main(int argc, char *argv[])
64 * Variables definition
73 * Input section: decode parameters passed in the calling
76 opterr = 0; /* don't want writing to stderr */
77 while ( (i = getopt(argc, argv, "hrv")) != -1) {
83 printf("Wrong -h option use\n");
93 case '?': /* unrecognized options */
94 printf("Unrecognized options -%c\n",optopt);
96 default: /* should not reached */
100 /* ***********************************************************
102 * Options processing completed
104 * Main code beginning
106 * ***********************************************************/
107 /* call sockconn to get a connected socket */
108 if ( (sock = sockconn(argv[optind], "echo", 6, SOCK_STREAM)) < 0) {
109 if (errno) perror("Socket creation error");
112 /* print some info about the socket, used to test some TCP_* options */
114 len = sizeof(buffer);
115 if (getsockopt(sock, SOL_TCP, TCP_CONGESTION, buffer, &len) < 0) {
116 perror("Cannot read congestion algorithm");
119 printf("Congestion algorithm %s\n", buffer);
122 /* check if resetting on close is required */
124 printf("Setting reset on close \n");
127 if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
128 perror("Cannot set linger");
132 /* do read/write operations */
133 ClientEcho(stdin, sock);
138 * routine to print usage info and exit
141 printf("Take daytime from a remote host \n");
143 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
144 // printf(" -v set verbosity on\n");
145 printf(" -r require reset on closing\n");
146 printf(" -h print this help\n");
150 void ClientEcho(FILE * filein, int socket)
152 char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
157 /* initialize file descriptor set */
159 maxfd = max(fileno(filein), socket) + 1;
161 FD_SET(socket, &fset); /* set for the socket */
163 FD_SET(fileno(filein), &fset); /* set for the standard input */
165 select(maxfd, &fset, NULL, NULL, NULL); /* wait for read ready */
166 if (FD_ISSET(fileno(filein), &fset)) { /* if ready on stdin */
167 if (fgets(sendbuff, MAXLINE, filein) == NULL) { /* if no input */
168 eof = 1; /* EOF on input */
169 shutdown(socket, SHUT_WR); /* close write half */
170 FD_CLR(fileno(filein), &fset); /* no more interest on stdin */
171 } else { /* else we have to write to socket */
172 nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
173 if (nwrite < 0) { /* on error stop */
174 printf("Errore in scrittura: %s", strerror(errno));
179 if (FD_ISSET(socket, &fset)) { /* if ready on socket */
180 nread = read(socket, recvbuff, strlen(sendbuff)); /* do read */
181 if (nread < 0) { /* error condition, stop client */
182 printf("Errore in lettura: %s\n", strerror(errno));
185 if (nread == 0) { /* server closed connection, stop */
189 printf("EOF prematuro sul socket\n");
193 recvbuff[nread] = 0; /* else read is ok, write on stdout */
194 if (fputs(recvbuff, stdout) == EOF) {
195 perror("Errore in scrittura su terminale");