source: trunk/third/tcp_wrappers/tli-sequent.c @ 11717

 /*
  * Warning - this relies heavily on the TLI implementation in PTX 2.X and will
  * probably not work under PTX 4.
  * 
  * Author: Tim Wright, Sequent Computer Systems Ltd., UK.
  * 
  * Modified slightly to conform to the new internal interfaces - Wietse
  */

#ifndef lint
static char sccsid[] = "@(#) tli-sequent.c 1.1 94/12/28 17:42:51";
#endif

#ifdef TLI_SEQUENT

/* System libraries. */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/tiuser.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>

extern int errno;
extern char *sys_errlist[];
extern int sys_nerr;
extern int t_errno;
extern char *t_errlist[];
extern int t_nerr;

/* Local stuff. */

#include "tcpd.h"
#include "tli-sequent.h"

/* Forward declarations. */

static char *tli_error();
static void tli_sink();

/* tli_host - determine endpoint info */

int     tli_host(request)
struct request_info *request;
{
    static struct sockaddr_in client;
    static struct sockaddr_in server;
    struct _ti_user *tli_state_ptr;
    union T_primitives *TSI_prim_ptr;
    struct strpeek peek;
    int     len;

    /*
     * Use DNS and socket routines for name and address conversions.
     */

    sock_methods(request);

    /*
     * Find out the client address using getpeerinaddr(). This call is the
     * TLI equivalent to getpeername() under Dynix/ptx.
     */

    len = sizeof(client);
    t_sync(request->fd);
    if (getpeerinaddr(request->fd, &client, len) < 0) {
        tcpd_warn("can't get client address: %s", tli_error());
        return;
    }
    request->client->sin = &client;

    /* Call TLI utility routine to get information on endpoint */
    if ((tli_state_ptr = _t_checkfd(request->fd)) == NULL)
        return;

    if (tli_state_ptr->ti_servtype == T_CLTS) {
        /* UDP - may need to get address the hard way */
        if (client.sin_addr.s_addr == 0) {
            /* The UDP endpoint is not connected so we didn't get the */
            /* remote address - get it the hard way ! */

            /* Look at the control part of the top message on the stream */
            /* we don't want to remove it from the stream so we use I_PEEK */
            peek.ctlbuf.maxlen = tli_state_ptr->ti_ctlsize;
            peek.ctlbuf.len = 0;
            peek.ctlbuf.buf = tli_state_ptr->ti_ctlbuf;
            /* Don't even look at the data */
            peek.databuf.maxlen = -1;
            peek.databuf.len = 0;
            peek.databuf.buf = 0;
            peek.flags = 0;

            switch (ioctl(request->fd, I_PEEK, &peek)) {
            case -1:
                tcpd_warn("can't peek at endpoint: %s", tli_error());
                return;
            case 0:
                /* No control part - we're hosed */
                tcpd_warn("can't get UDP info: %s", tli_error());
                return;
            default:
                /* FALL THROUGH */
                ;
            }
            /* Can we even check the PRIM_type ? */
            if (peek.ctlbuf.len < sizeof(long)) {
                tcpd_warn("UDP control info garbage");
                return;
            }
            TSI_prim_ptr = (union T_primitives *) peek.ctlbuf.buf;
            if (TSI_prim_ptr->type != T_UNITDATA_IND) {
                tcpd_warn("wrong type for UDP control info");
                return;
            }
            /* Validate returned unitdata indication packet */
            if ((peek.ctlbuf.len < sizeof(struct T_unitdata_ind)) ||
                ((TSI_prim_ptr->unitdata_ind.OPT_length != 0) &&
                 (peek.ctlbuf.len <
                  TSI_prim_ptr->unitdata_ind.OPT_length +
                  TSI_prim_ptr->unitdata_ind.OPT_offset))) {
                tcpd_warn("UDP control info garbaged");
                return;
            }
            /* Extract the address */
            memcpy(&client,
                   peek.ctlbuf.buf + TSI_prim_ptr->unitdata_ind.SRC_offset,
                   TSI_prim_ptr->unitdata_ind.SRC_length);
        }
        request->sink = tli_sink;
    }
    if (getmyinaddr(request->fd, &server, len) < 0)
        tcpd_warn("can't get local address: %s", tli_error());
    else
        request->server->sin = &server;
}

/* tli_error - convert tli error number to text */

static char *tli_error()
{
    static char buf[40];

    if (t_errno != TSYSERR) {
        if (t_errno < 0 || t_errno >= t_nerr) {
            sprintf(buf, "Unknown TLI error %d", t_errno);
            return (buf);
        } else {
            return (t_errlist[t_errno]);
        }
    } else {
        if (errno < 0 || errno >= sys_nerr) {
            sprintf(buf, "Unknown UNIX error %d", errno);
            return (buf);
        } else {
            return (sys_errlist[errno]);
        }
    }
}

/* tli_sink - absorb unreceived datagram */

static void tli_sink(fd)
int     fd;
{
    struct t_unitdata *unit;
    int     flags;

    /*
     * Something went wrong. Absorb the datagram to keep inetd from looping.
     * Allocate storage for address, control and data. If that fails, sleep
     * for a couple of seconds in an attempt to keep inetd from looping too
     * fast.
     */

    if ((unit = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ALL)) == 0) {
        tcpd_warn("t_alloc: %s", tli_error());
        sleep(5);
    } else {
        (void) t_rcvudata(fd, unit, &flags);
        t_free((void *) unit, T_UNITDATA);
    }
}

#endif /* TLI_SEQUENT */