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 TCP_echo_third.c
22 * Simple TCP client for echo service (port 7)
23 * This version use select
25 * Author: Simone Piccardi
28 * Usage: echo -h give all info's
32 ****************************************************************/
34 * Include needed headers
36 #include <sys/types.h> /* predefined types */
37 #include <unistd.h> /* include unix standard library */
38 #include <arpa/inet.h> /* IP addresses conversion utiliites */
39 #include <sys/socket.h> /* socket library */
40 #include <stdio.h> /* include standard I/O library */
41 #include <errno.h> /* include error codes */
42 #include <string.h> /* include erroro strings definitions */
48 void ClientEcho(FILE * filein, int socket);
49 void SigTERM_hand(int sig);
52 int main(int argc, char *argv[])
55 * Variables definition
59 struct sockaddr_in serv_add;
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 * ***********************************************************/
94 if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
95 perror("Socket creation error");
98 /* initialize address */
99 memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
100 serv_add.sin_family = AF_INET; /* address type is INET */
101 serv_add.sin_port = htons(7); /* echo port is 7 */
102 /* build address using inet_pton */
103 if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
104 perror("Address creation error");
107 /* extablish connection */
108 if (connect(sock, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
109 perror("Connection error");
112 /* check if resetting on close is required */
114 printf("Setting reset on close \n");
117 if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
118 perror("Cannot set linger");
122 /* do read/write operations */
123 ClientEcho(stdin, sock);
128 * routine to print usage info and exit
131 printf("Take daytime from a remote host \n");
133 printf(" daytime [-h] [-v] [host in dotted decimal form] \n");
134 // printf(" -v set verbosity on\n");
135 printf(" -r require reset on closing\n");
136 printf(" -h print this help\n");
140 void ClientEcho(FILE * filein, int socket)
142 char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
146 /* initialize file descriptor set */
148 maxfd = max(fileno(filein), socket) + 1;
150 FD_SET(socket, &fset); /* set for the socket */
151 FD_SET(fileno(filein), &fset); /* set for the standard input */
152 select(maxfd, &fset, NULL, NULL, NULL); /* wait for read ready */
153 if (FD_ISSET(fileno(filein), &fset)) { /* if ready on stdin */
154 if (fgets(sendbuff, MAXLINE, filein) == NULL) { /* if no input */
155 return; /* we stopped client */
156 } else { /* else we have to write to socket */
157 nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
158 if (nwrite < 0) { /* on error stop */
159 printf("Errore in scrittura: %s", strerror(errno));
164 if (FD_ISSET(socket, &fset)) { /* if ready on socket */
165 nread = read(socket, recvbuff, strlen(sendbuff)); /* do read */
166 if (nread < 0) { /* error condition, stop client */
167 printf("Errore in lettura: %s\n", strerror(errno));
170 if (nread == 0) { /* server closed connection, stop */
171 printf("EOF sul socket\n");
174 recvbuff[nread] = 0; /* else read is ok, write on stdout */
175 if (fputs(recvbuff, stdout) == EOF) {
176 perror("Errore in scrittura su terminale");