mars-nwe/emutli.c

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/* emutli.c 28-Apr-96 */
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/*
* One short try to emulate TLI with SOCKETS.
*/
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/* (C)opyright (C) 1993,1996 Martin Stover, Marburg, Germany
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*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
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#include <linux/config.h>
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#include <linux/sockios.h>
#include "net.h"
#include <linux/if.h>
#include <linux/route.h>
#include <linux/in.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
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static int locipxdebug=0;
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void set_locipxdebug(int debug)
{
locipxdebug = debug;
}
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void set_sock_debug(int sock)
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{
if (setsockopt(sock, SOL_SOCKET, SO_DEBUG, &locipxdebug, sizeof(int))==-1){
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errorp(0, "setsockopt SO_DEBUG", NULL);
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}
}
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void sock2ipxadr(ipxAddr_t *i, struct sockaddr_ipx *so)
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{
memcpy(i->net, &so->sipx_network, IPX_NET_SIZE + IPX_NODE_SIZE);
memcpy(i->sock, &so->sipx_port, 2);
}
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void ipx2sockadr(struct sockaddr_ipx *so, ipxAddr_t *i)
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{
memcpy(&so->sipx_network, i->net, IPX_NET_SIZE + IPX_NODE_SIZE);
memcpy(&so->sipx_port, i->sock, 2);
}
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void set_emu_tli(void)
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{
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int i = get_ini_int(100);
if (i > -1) locipxdebug = i;
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}
int t_open(char *name, int open_mode, char * p)
{
int opt=1;
int sock = socket(AF_IPX, SOCK_DGRAM, AF_IPX);
if (sock < 0) return(sock);
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set_sock_debug(sock); /* debug switch */
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/* Now allow broadcast */
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if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &opt,sizeof(opt))==-1){
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errorp(0, "setsockopt SO_BROADCAST", NULL);
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close(sock);
return(-1);
}
return(sock);
}
int t_bind(int sock, struct t_bind *a_in, struct t_bind *a_out)
{
struct sockaddr_ipx ipxs;
int maxplen=sizeof(struct sockaddr_ipx);
memset((char*)&ipxs, 0, sizeof(struct sockaddr_ipx));
ipxs.sipx_family=AF_IPX;
if (a_in != (struct t_bind*) NULL
&& a_in->addr.len == sizeof(ipxAddr_t))
ipx2sockadr(&ipxs, (ipxAddr_t*) (a_in->addr.buf));
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ipxs.sipx_network = 0L; /* allways default net */
memset(ipxs.sipx_node, 0, IPX_NODE_SIZE); /* allways default node */
/* Hi Volker :) */
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if (bind(sock, (struct sockaddr*)&ipxs, sizeof(struct sockaddr_ipx))==-1) {
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errorp(0, "TLI-BIND", "socket Nr:0x%x", (int)GET_BE16(&(ipxs.sipx_port)));
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return(-1);
}
if (a_out != (struct t_bind*) NULL) {
if (getsockname(sock, (struct sockaddr*)&ipxs, &maxplen) == -1){
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errorp(0, "TLI-GETSOCKNAME", NULL);
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return(-1);
}
sock2ipxadr((ipxAddr_t*) (a_out->addr.buf), &ipxs);
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XDPRINTF((2,0,"T_BIND ADR=%s", visable_ipx_adr((ipxAddr_t *) a_out->addr.buf ) ));
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}
return(0);
}
int t_unbind(int sock)
{
return(0);
}
int t_errno=0;
void t_error(char *s)
{
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errorp(0, "t_error", s);
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t_errno=0;
}
int t_close(int fd)
{
return(close(fd));
}
int poll( struct pollfd *fds, unsigned long nfds, int timeout)
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/* only POLL-IN */
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{
fd_set readfs;
/*
fd_set writefs;
fd_set exceptfs;
*/
struct pollfd *p = fds;
struct timeval time_out;
int k = (int)nfds;
int result=-1;
int high_f=0;
FD_ZERO(&readfs);
/*
FD_ZERO(&writefs);
FD_ZERO(&exceptfs);
*/
while (k--){
if (p->fd > -1 && (p->events & POLLIN)) {
FD_SET(p->fd, &readfs);
if (p->fd > high_f) high_f = p->fd;
}
p->revents=0;
p++;
}
if (timeout > 1000) {
time_out.tv_sec = timeout / 1000;
time_out.tv_usec = 0;
} else {
time_out.tv_sec = 0;
time_out.tv_usec = timeout*1000;
}
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if (0 > (result = select(high_f+1, &readfs, NULL, NULL, &time_out)))
return(-1);
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if (result) {
int rest=result;
k = (int)nfds;
p = fds;
while (k--){
if (p->fd > -1 && FD_ISSET(p->fd, &readfs)){
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p->revents = POLLIN;
if (! --rest) break; /* ready */
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}
p++;
}
}
return(result);
}
int t_rcvudata(int fd, struct t_unitdata *ud, int *flags)
{
struct sockaddr_ipx ipxs;
int sz = sizeof(struct sockaddr_ipx);
int result;
ipxs.sipx_family=AF_IPX;
if (ud->addr.maxlen < sizeof(ipxAddr_t)) return(-1);
result = recvfrom(fd, ud->udata.buf, ud->udata.maxlen, 0,
(struct sockaddr *) &ipxs, &sz);
if (result < 0) return(result);
if (ud->opt.maxlen) {
*((uint8*)ud->opt.buf) = ipxs.sipx_type;
ud->opt.len = 1;
}
ud->udata.len=result;
sock2ipxadr((ipxAddr_t*) (ud->addr.buf), &ipxs);
ud->addr.len = sizeof(ipxAddr_t);
return(result);
}
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#define HAVE_IPX_SEND_BUG 0
#if HAVE_IPX_SEND_BUG
static int last_fd;
static int new_try;
static void sig_alarm(int rsig)
{
struct sockaddr_ipx ipxs;
int maxplen=sizeof(struct sockaddr_ipx);
signal(rsig, SIG_IGN);
XDPRINTF((1, 0, "GOT ALARM SIGNAL in sendto"));
memset((char*)&ipxs, 0, sizeof(struct sockaddr_ipx));
ipxs.sipx_family=AF_IPX;
if (getsockname(last_fd, (struct sockaddr*)&ipxs, &maxplen) != -1){
int sock;
int i = 5;
while (close(last_fd) == -1 && i--) sleep(1);
sleep(2);
sock = socket(AF_IPX, SOCK_DGRAM, AF_IPX);
if (bind(sock, (struct sockaddr*)&ipxs, sizeof(struct sockaddr_ipx))==-1) {
errorp(0, "TLI-BIND", "socket Nr:0x%x", (int)GET_BE16(&(ipxs.sipx_port)));
exit(1);
}
if (sock != last_fd) {
dup2(sock, last_fd);
close(sock);
}
new_try++;
} else
errorp(0, "getsockname", NULL);
}
#endif
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int t_sndudata(int fd, struct t_unitdata *ud)
{
int result;
struct sockaddr_ipx ipxs;
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if (ud->addr.len != sizeof(ipxAddr_t)) return(-1);
#if HAVE_IPX_SEND_BUG
{
int anz_tries=3;
do {
void (*old_sig)(int rsig) = signal(SIGALRM, sig_alarm);
new_try = 0;
alarm(2);
last_fd = fd;
#endif
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memset(&ipxs, 0, sizeof(struct sockaddr_ipx));
ipxs.sipx_family=AF_IPX;
ipx2sockadr(&ipxs, (ipxAddr_t*) (ud->addr.buf));
ipxs.sipx_type = (ud->opt.len) ? (uint8) *((uint8*)(ud->opt.buf)) : 0;
result = sendto(fd,(void *)ud->udata.buf,
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ud->udata.len, 0, (struct sockaddr *) &ipxs, sizeof(ipxs));
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#if HAVE_IPX_SEND_BUG
alarm(0);
signal(SIGALRM, old_sig);
} while (new_try && anz_tries--);
}
#endif
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return(result);
}
int t_rcvuderr(int fd, struct t_uderr *ud)
{
return(0);
}