/* cc -o datapipe -O datapipe.c */
/* cc -o datapipe -O -DSTRERROR datapipe.c SunOS ise */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <netdb.h>
#include <linux/time.h>
#ifdef STRERROR
extern char *sys_errlist[];
extern int sys_nerr;
char *undef = "Undefined error";
char *strerror(error)
int error;
{
if (error > sys_nerr)
return undef;
return sys_errlist[error];
}
#endif
main(argc, argv)
int argc;
char **argv;
{
int lsock, csock, osock;
FILE *cfile;
char buf[4096];
struct sockaddr_in laddr, caddr, oaddr;
int caddrlen = sizeof(caddr);
fd_set fdsr, fdse;
struct hostent *h;
struct servent *s;
int nbyt;
unsigned long a;
unsigned short oport;
if (argc != 4) {
fprintf(stderr,"Kullanimi: %s local_port linklenecek_port
linklenecek_host\n",argv[0]);
return 30;
}
a = inet_addr(argv[3]);
if (!(h = gethostbyname(argv[3])) &&
!(h = gethostbyaddr(&a, 4, AF_INET))) {
perror(argv[3]);
return 25;
}
oport = atol(argv[2]);
laddr.sin_port = htons((unsigned short)(atol(argv[1])));
if ((lsock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
perror("socket");
return 20;
}
laddr.sin_family = htons(AF_INET);
laddr.sin_addr.s_addr = htonl(0);
if (bind(lsock, &laddr, sizeof(laddr))) {
perror("bind");
return 20;
}
if (listen(lsock, 1)) {
perror("listen");
return 20;
}
if ((nbyt = fork()) == -1) {
perror("fork");
return 20;
}
if (nbyt > 0)
return 0;
setsid();
while ((csock = accept(lsock, &caddr, &caddrlen)) != -1) {
cfile = fdopen(csock,"r+");
if ((nbyt = fork()) == -1) {
fprintf(cfile, "500 fork: %s\n", strerror(errno));
shutdown(csock,2);
fclose(cfile);
continue;
}
if (nbyt == 0)
goto gotsock;
fclose(cfile);
while (waitpid(-1, NULL, WNOHANG) > 0);
}
return 20;
gotsock:
if ((osock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
fprintf(cfile, "500 socket: %s\n", strerror(errno));
goto quit1;
}
oaddr.sin_family = h->h_addrtype;
oaddr.sin_port = htons(oport);
memcpy(&oaddr.sin_addr, h->h_addr, h->h_length);
if (connect(osock, &oaddr, sizeof(oaddr))) {
fprintf(cfile, "500 connect: %s\n", strerror(errno));
goto quit1;
}
while (1) {
FD_ZERO(&fdsr);
FD_ZERO(&fdse);
FD_SET(csock,&fdsr);
FD_SET(csock,&fdse);
FD_SET(osock,&fdsr);
FD_SET(osock,&fdse);
if (select(20, &fdsr, NULL, &fdse, NULL) == -1) {
fprintf(cfile, "500 select: %s\n", strerror(errno));
goto quit2;
}
if (FD_ISSET(csock,&fdsr) || FD_ISSET(csock,&fdse)) {
if ((nbyt = read(csock,buf,4096)) <= 0)
goto quit2;
if ((write(osock,buf,nbyt)) <= 0)
goto quit2;
} else if (FD_ISSET(osock,&fdsr) || FD_ISSET(osock,&fdse)) {
if ((nbyt = read(osock,buf,4096)) <= 0)
goto quit2;
if ((write(csock,buf,nbyt)) <= 0)
goto quit2;
}
}
quit2:
shutdown(osock,2);
close(osock);
quit1:
fflush(cfile);
shutdown(csock,2);
quit0:
fclose(cfile);
return 0;
}
______________________________________________________________________
A.Gurcan Ozturk
ISPRO Internet Services
aozturk@ispro.net.tr
EgeBBS : telnet bbs.ege.edu.tr 4800
On Wed, 5 May 1999, Devrim SERAL wrote:
>
>
> On Wed, 5 May 1999, murat kasikcioglu wrote:
>
> > merhaba,
> > redhat 5.2 'de port forwarding icin bir komut var mi?
> > eger kullanan var ise yardimlarini bekliyorum.
> > iyi calismalar,
> >
> Port forwarding icin ipfwadm kullanabilirsiniz..
> ipfwadm -I -a accept -P tcp -S 0.0.0.0/0 -D localhostip 3000 -r 23
> Bununla herhangibi bir yerden sizin makinenizin 3000 portuna erisilmek
> istendiginde bunu 23 porta yonlendiriyor..
> Bu arada baska ip'ye yonlendirmek istiyorsaniz o zaman www.boutell.com'a
> bakmanizi oneririm ..
> iyi calismalar..
> dS
>
>
> Listeden cikmak icin:
> unsub linux
> mesajini listeci@bilkent.edu.tr'a gonderiniz.
> Lutfen Listeci icin MIME / HTML / Turkce Aksan kullanmayin.
> Liste arsivinin adresi: http://listweb.bilkent.edu.tr/
>
Listeden cikmak icin:
unsub linux
mesajini listeci@bilkent.edu.tr'a gonderiniz.
Lutfen Listeci icin MIME / HTML / Turkce Aksan kullanmayin.
Liste arsivinin adresi: http://listweb.bilkent.edu.tr/