-/* TCP_echo1.c
+/* TCP_echo.c
*
* Copyright (C) 2001-2003 Simone Piccardi
*
*/
/****************************************************************
*
- * Program ElemEchoTCPClient.c
+ * Program TCP_echo.c
* Simple TCP client for echo service (port 7)
*
* Author: Simone Piccardi
*
* Usage: echo -h give all info's
*
- * $Id: TCP_echo.c,v 1.1 2003/06/23 13:58:36 piccardi Exp $
- *
****************************************************************/
/*
* Include needed headers
*/
-#include <sys/types.h> /* predefined types */
-#include <unistd.h> /* include unix standard library */
-#include <arpa/inet.h> /* IP addresses conversion utiliites */
-#include <sys/socket.h> /* socket library */
-#include <stdio.h> /* include standard I/O library */
+#include <sys/types.h> /* primitive system data types */
+#include <unistd.h> /* unix standard library */
+#include <arpa/inet.h> /* IP addresses conversion utilities */
+#include <sys/socket.h> /* socket constants, types and functions */
+#include <stdio.h> /* standard I/O library */
+#include <errno.h> /* error definitions and routines */
+#include <string.h> /* C strings library */
+#include <stdlib.h> /* C standard library */
+#include <netinet/tcp.h> /* TCP constants and types */
+
+/* still not defined in some include, because too new ... */
+#ifndef TCP_CONGESTION
+#define TCP_CONGESTION 13
+#endif
+
+#include "Gapil.h"
+#include "macros.h"
#define MAXLINE 256
void usage(void);
* Variables definition
*/
int sock, i;
+ socklen_t len;
int reset = 0;
- struct sockaddr_in serv_add;
+ int verbosity = 0;
+ char buffer[MAXLINE];
struct linger ling;
/*
* Input section: decode parameters passed in the calling
* Use getopt function
*/
opterr = 0; /* don't want writing to stderr */
- while ( (i = getopt(argc, argv, "hr")) != -1) {
+ while ( (i = getopt(argc, argv, "hrv")) != -1) {
switch (i) {
/*
* Handling options
usage();
return(1);
break;
+ case 'v':
+ verbosity = 1;
+ break;
case 'r':
reset = 1;
break;
* Main code beginning
*
* ***********************************************************/
- /* create socket */
- if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
- perror("Socket creation error");
- return 1;
- }
- /* initialize address */
- memset((void *) &serv_add, 0, sizeof(serv_add)); /* clear server address */
- serv_add.sin_family = AF_INET; /* address type is INET */
- serv_add.sin_port = htons(7); /* echo port is 7 */
- /* build address using inet_pton */
- if ( (inet_pton(AF_INET, argv[optind], &serv_add.sin_addr)) <= 0) {
- perror("Address creation error");
+ /* call sockconn to get a connected socket */
+ if ( (sock = sockconn(argv[optind], "echo", 6, SOCK_STREAM)) < 0) {
+ if (errno) perror("Socket creation error");
return 1;
}
- /* extablish connection */
- if (connect(sock, (struct sockaddr *)&serv_add, sizeof(serv_add)) < 0) {
- perror("Connection error");
- return 1;
+ /* print some info about the socket, used to test some TCP_* options */
+ if (verbosity) {
+ len = sizeof(buffer);
+ if (getsockopt(sock, SOL_TCP, TCP_CONGESTION, buffer, &len) < 0) {
+ perror("Cannot read congestion algorithm");
+ } else {
+ buffer[len]=0;
+ printf("Congestion algorithm %s\n", buffer);
+ }
}
/* check if resetting on close is required */
if (reset) {
+ printf("Setting reset on close \n");
ling.l_onoff = 1;
ling.l_linger = 0;
if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling))) {
exit(1);
}
}
- /* read daytime from server */
+ /* do read/write operations */
ClientEcho(stdin, sock);
/* normal exit */
return 0;
void ClientEcho(FILE * filein, int socket)
{
char sendbuff[MAXLINE+1], recvbuff[MAXLINE+1];
- int nread;
- while (fgets(sendbuff, MAXLINE, filein) != NULL) {
- FullWrite(socket, sendbuff, strlen(sendbuff));
- nread = FullRead(socket, recvbuff, strlen(sendbuff));
- recvbuff[nread] = 0;
- fputs(recvbuff, stdout);
+ int nread, nwrite;
+ int maxfd;
+ fd_set fset;
+ int eof = 0;
+ /* initialize file descriptor set */
+ FD_ZERO(&fset);
+ maxfd = max(fileno(filein), socket) + 1;
+ while (1) {
+ FD_SET(socket, &fset); /* set for the socket */
+ if (eof == 0) {
+ FD_SET(fileno(filein), &fset); /* set for the standard input */
+ }
+ select(maxfd, &fset, NULL, NULL, NULL); /* wait for read ready */
+ if (FD_ISSET(fileno(filein), &fset)) { /* if ready on stdin */
+ if (fgets(sendbuff, MAXLINE, filein) == NULL) { /* if no input */
+ eof = 1; /* EOF on input */
+ shutdown(socket, SHUT_WR); /* close write half */
+ FD_CLR(fileno(filein), &fset); /* no more interest on stdin */
+ } else { /* else we have to write to socket */
+ nwrite = FullWrite(socket, sendbuff, strlen(sendbuff));
+ if (nwrite < 0) { /* on error stop */
+ printf("Errore in scrittura: %s", strerror(errno));
+ return;
+ }
+ }
+ }
+ if (FD_ISSET(socket, &fset)) { /* if ready on socket */
+ nread = read(socket, recvbuff, strlen(sendbuff)); /* do read */
+ if (nread < 0) { /* error condition, stop client */
+ printf("Errore in lettura: %s\n", strerror(errno));
+ return;
+ }
+ if (nread == 0) { /* server closed connection, stop */
+ if (eof == 1) {
+ return;
+ } else {
+ printf("EOF prematuro sul socket\n");
+ return;
+ }
+ }
+ recvbuff[nread] = 0; /* else read is ok, write on stdout */
+ if (fputs(recvbuff, stdout) == EOF) {
+ perror("Errore in scrittura su terminale");
+ return;
+ }
+ }
}
- return;
}
projects / gapil.git / blobdiff