Firewall Handbuch für LINUX 2.0 und 2.2 - zurück

FD_SET(newfd, ) ;
FD_SET(fd_to_proxy, ) ;
FD_SET(sockudp, ) ;
i = select(maxfd, , 0, 0, 0) ;
/* Is there a DATAGRAM ? */
if (FD_ISSET(sockudp, )) {
fromlen = sizeof(from) ;
res = recvfrom(sockudp, buffer, sizeof(buffer), 0,
(struct sockaddr *) , ) ;
if (res > 0) {
if (dflg) fprintf(stderr, "UDP (%d) %x:%d %x\n", res,
ntohl(from.sin_addr.s_addr),
ntohs(from.sin_port),
ntohs(from.sin_port)) ;
if (!already_bind) {
int on = 1 ;
already_bind = 1 ;
outudp = from ;
if (setsockopt(sockcl, SOL_SOCKET,
SO_REUSEADDR, (char *) , sizeof(on)) < 0) {
perror("setsockopt(REUSEADDR)
problem") ;
}
if (bind(sockcl, (struct sockaddr *)
, sizeof(outudp)) == -1)
perror("bind sockl") ;
}
sendto(sockcl, buffer, res, 0, (struct sockaddr *),
sizeof(struct sockaddr_in)) ;
}
}
/* Is there any data from the client ? */
if (FD_ISSET(newfd, )) {
lu = read(newfd, buffer, sizeof(buffer)) ;
if (lu 2) {
printf("From client: (%d)\n", lu) ;
fflush(stdout) ;
hexdump_err(buffer, lu) ;
}
}
/* Is there any data from server ? */
if (FD_ISSET(fd_to_proxy, )) {
lu = read(fd_to_proxy, buffer, sizeof(buffer)) ;
if (lu 2) {
printf("From Proxy (%d):\n", lu) ;
fflush(stdout) ;
hexdump_err(buffer, lu) ;
}
}
}
_exit(0) ;
}
/*
* This function setups the listen port, and forks a child for each
* connection
*/
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