libnsl/nsl/t_getname.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "mt.h"
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stropts.h>
#include <sys/stream.h>
#include <xti.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <assert.h>
#include <signal.h>
#include "tx.h"

static int __tx_tlitpi_getprotaddr_locked(struct _ti_user *tiptr,
    struct t_bind *boundaddr, struct t_bind *peer);


static int __tx_getname_locked(int fd, struct netbuf *name, int type);

int
_tx_getname(int fd, struct netbuf *name, int type, int api_semantics)
{
    struct _ti_user *tiptr;
    int retval, sv_errno;

    assert(_T_IS_TLI(api_semantics)); /* TLI only interface */
    if (!name || ((type != LOCALNAME) && (type != REMOTENAME))) {
        errno = EINVAL;
        return (-1);
    }

    if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
        return (-1);
    sig_mutex_lock(&tiptr->ti_lock);

    retval = __tx_getname_locked(fd, name, type);

    if (retval < 0) {
        sv_errno = errno;
        sig_mutex_unlock(&tiptr->ti_lock);
        errno = sv_errno;
        return (-1);
    }

    sig_mutex_unlock(&tiptr->ti_lock);

    return (0);
}


static int
__tx_getname_locked(int fd, struct netbuf *name, int type)
{
    int retval;

    do {
        retval = ioctl(fd,
            (type == LOCALNAME) ? TI_GETMYNAME : TI_GETPEERNAME, name);
    } while (retval < 0 && errno == EINTR);

    if (retval < 0) {
        t_errno = TSYSERR;
        return (-1);
    }
    return (0);
}


int
_tx_getprotaddr(
    int fd,
    struct t_bind *boundaddr,
    struct t_bind *peeraddr,
    int api_semantics)
{
    struct _ti_user *tiptr;
    int retval, sv_errno;
    struct T_addr_req *addreqp;
    struct T_addr_ack *addrackp;
    int didalloc;
    struct strbuf ctlbuf;
    int retlen;

    if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
        return (-1);

    sig_mutex_lock(&tiptr->ti_lock);

    if ((tiptr->ti_prov_flag & XPG4_1) == 0) {
        /*
         * Provider does not support XTI inspired TPI so we
         * try to do operation assuming TLI inspired TPI
         */
        retval = __tx_tlitpi_getprotaddr_locked(tiptr, boundaddr,
            peeraddr);
        sv_errno = errno;
        sig_mutex_unlock(&tiptr->ti_lock);
        errno = sv_errno;
        return (retval);
    }

    /*
     * Acquire buffer for use in sending/receiving the message.
     * Note: assumes (correctly) that ti_ctlsize is large enough
     * to hold sizeof (struct T_addr_req/ack)
     */
    if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
        sv_errno = errno;
        sig_mutex_unlock(&tiptr->ti_lock);
        errno = sv_errno;
        return (-1);
    }

    /* LINTED pointer cast */
    addreqp = (struct T_addr_req *)ctlbuf.buf;
    addreqp->PRIM_type = T_ADDR_REQ;

    do {
        retval = _t_do_ioctl(fd, ctlbuf.buf,
            (int)sizeof (struct T_addr_req), TI_GETADDRS, &retlen);
    } while (retval < 0 && errno == EINTR);

    /* retval can now be either 0 or -1 */
    if (retval < 0) {
        sv_errno = errno;
        sig_mutex_unlock(&tiptr->ti_lock);
        errno = sv_errno;
        goto err_out;
    }
    sig_mutex_unlock(&tiptr->ti_lock);

    if (retlen < (int)sizeof (struct T_addr_ack)) {
        t_errno = TSYSERR;
        errno = EIO;
        retval = -1;
        goto err_out;
    }

    /* LINTED pointer cast */
    addrackp = (struct T_addr_ack *)ctlbuf.buf;

    /*
     * We assume null parameters are OK and not errors
     */
    if (boundaddr != NULL && boundaddr->addr.maxlen > 0) {
        if (TLEN_GT_NLEN(addrackp->LOCADDR_length,
            boundaddr->addr.maxlen)) {
            t_errno = TBUFOVFLW;
            retval = -1;
            goto err_out;
        }
        boundaddr->addr.len = addrackp->LOCADDR_length;
        (void) memcpy(boundaddr->addr.buf,
            ctlbuf.buf + addrackp->LOCADDR_offset,
            (size_t)addrackp->LOCADDR_length);
    }

    /*
     * Note: In states where there is no remote end of the connection
     * the T_ADDR_REQ primitive does not return a remote address. However,
     * in protcols such as TCP, the transport connection is established
     * before the TLI/XTI level association is established. Therefore,
     * in state T_OUTCON, the transport may return a remote address where
     * TLI/XTI level thinks there is no remote end and therefore
     * no remote address should be returned. We therefore do not look at
     * address returned by transport provider in T_OUTCON state.
     * Tested by XTI test suite.
     */
    if (tiptr->ti_state != T_OUTCON &&
        peeraddr != NULL && peeraddr->addr.maxlen > 0) {
        if (TLEN_GT_NLEN(addrackp->REMADDR_length,
            peeraddr->addr.maxlen)) {
            t_errno = TBUFOVFLW;
            retval = -1;
            goto err_out;
        }
        peeraddr->addr.len = addrackp->REMADDR_length;
        (void) memcpy(peeraddr->addr.buf,
            ctlbuf.buf + addrackp->REMADDR_offset,
            (size_t)addrackp->REMADDR_length);
    }

err_out:
    if (didalloc)
        free(ctlbuf.buf);
    else
        tiptr->ti_ctlbuf = ctlbuf.buf;
    return (retval);
}

static int
__tx_tlitpi_getprotaddr_locked(
    struct _ti_user *tiptr,
    struct t_bind *boundaddr,
    struct t_bind *peeraddr)
{
    if (boundaddr) {
        boundaddr->addr.len = 0;
        if (tiptr->ti_state >= TS_IDLE) {
            /*
             * assume bound endpoint .
             * Note: TI_GETMYNAME can return
             * a finite length all zeroes address for unbound
             * endpoint so we avoid relying on it for bound
             * endpoints for XTI t_getprotaddr() semantics.
             */
            if (__tx_getname_locked(tiptr->ti_fd, &boundaddr->addr,
                LOCALNAME) < 0)
                return (-1);

        }
    }
    if (peeraddr) {

        peeraddr->addr.len = 0;

        if (tiptr->ti_state >= TS_DATA_XFER) {
            /*
             * assume connected endpoint.
             * The TI_GETPEERNAME call can fail with error
             * if endpoint is not connected so we don't call it
             * for XTI t_getprotaddr() semantics
             */
            if (__tx_getname_locked(tiptr->ti_fd, &peeraddr->addr,
                REMOTENAME) < 0)
                return (-1);
        }
    }
    return (0);
}