/* * 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 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.5.2.1 */ #include "mt.h" #include #include #include #include #include #define _SUN_TPI_VERSION 2 #include #include #include #include #include #include #include "tx.h" int _tx_accept( int fd, int resfd, const struct t_call *call, int api_semantics ) { struct T_conn_res *cres; struct strfdinsert strfdinsert; int size, retval, sv_errno; struct _ti_user *tiptr; struct _ti_user *restiptr; sigset_t mask; struct strbuf ctlbuf; int didalloc; t_scalar_t conn_res_prim; if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL) return (-1); if ((restiptr = _t_checkfd(resfd, 0, api_semantics)) == NULL) return (-1); /* * We need to block signals to perform the I_FDINSERT operation * (sending T_CONN_RES downstream) which is non-idempotent. * Note that sig_mutex_lock() only defers signals, it does not * block them, so interruptible syscalls could still get EINTR. */ (void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask); sig_mutex_lock(&tiptr->ti_lock); if (tiptr->ti_servtype == T_CLTS) { t_errno = TNOTSUPPORT; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (-1); } if (_T_IS_XTI(api_semantics)) { /* * User level state verification only done for XTI * because doing for TLI may break existing applications * * For fd == resfd, state should be T_INCON * For fd != resfd, * fd state should be T_INCON * resfd state should be T_IDLE (bound endpoint) or * it can be T_UNBND. The T_UNBND case is not (yet?) * allowed in the published XTI spec but fixed by the * corrigenda. */ if ((fd == resfd && tiptr->ti_state != T_INCON) || (fd != resfd && ((tiptr->ti_state != T_INCON) || !(restiptr->ti_state == T_IDLE || restiptr->ti_state == T_UNBND)))) { t_errno = TOUTSTATE; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (-1); } /* * XTI says: * If fd != resfd, and a resfd bound to a protocol address is * passed, then it better not have a qlen > 0. * That is, an endpoint bound as if it will be a listener * cannot be used as an acceptor. */ if (fd != resfd && restiptr->ti_state == T_IDLE && restiptr->ti_qlen > 0) { t_errno = TRESQLEN; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (-1); } if (fd == resfd && tiptr->ti_ocnt > 1) { t_errno = TINDOUT; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (-1); } /* * Note: TRESADDR error is specified by XTI. It happens * when resfd is bound and fd and resfd are not BOUND to * the same protocol address. TCP obviously does allow * two endpoints to bind to the same address. Why is the * need for this error considering there is an address switch * that can be done for the endpoint at accept time ? Go * figure and ask the XTI folks. * We interpret this to be a transport specific error condition * to be be coveyed by the transport provider in T_ERROR_ACK * to T_CONN_RES on transports that allow two endpoints to * be bound to the same address and have trouble with the * idea of accepting connections on a resfd that has a qlen > 0 */ } if (fd != resfd) { if ((retval = _ioctl(resfd, I_NREAD, &size)) < 0) { sv_errno = errno; t_errno = TSYSERR; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); errno = sv_errno; return (-1); } if (retval > 0) { t_errno = TBADF; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (-1); } } /* * Acquire ctlbuf for use in sending/receiving control part * of the message. */ if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) { sv_errno = errno; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); errno = sv_errno; return (-1); } /* * In Unix98 t_accept() need not return [TLOOK] if connect/disconnect * indications are present. TLI and Unix95 need to return error. */ if (_T_API_VER_LT(api_semantics, TX_XTI_XNS5_API)) { if (_t_is_event(fd, tiptr) < 0) goto err_out; } /* LINTED pointer cast */ cres = (struct T_conn_res *)ctlbuf.buf; cres->OPT_length = call->opt.len; cres->OPT_offset = 0; cres->SEQ_number = call->sequence; if ((restiptr->ti_flags & V_ACCEPTOR_ID) != 0) { cres->ACCEPTOR_id = restiptr->acceptor_id; cres->PRIM_type = conn_res_prim = T_CONN_RES; } else { /* I_FDINSERT should use O_T_CONN_RES. */ cres->ACCEPTOR_id = 0; cres->PRIM_type = conn_res_prim = O_T_CONN_RES; } size = (int)sizeof (struct T_conn_res); if (call->opt.len) { if (_t_aligned_copy(&ctlbuf, call->opt.len, size, call->opt.buf, &cres->OPT_offset) < 0) { /* * Aligned copy will overflow buffer allocated based * transport maximum options length. * return error. */ t_errno = TBADOPT; goto err_out; } size = cres->OPT_offset + cres->OPT_length; } if (call->udata.len) { if ((tiptr->ti_cdatasize == T_INVALID /* -2 */) || ((tiptr->ti_cdatasize != T_INFINITE /* -1 */) && (call->udata.len > (uint32_t)tiptr->ti_cdatasize))) { /* * user data not valid with connect or it * exceeds the limits specified by the transport * provider */ t_errno = TBADDATA; goto err_out; } } ctlbuf.len = size; /* * Assumes signals are blocked so putmsg() will not block * indefinitely */ if ((restiptr->ti_flags & V_ACCEPTOR_ID) != 0) { /* * Assumes signals are blocked so putmsg() will not block * indefinitely */ if (putmsg(fd, &ctlbuf, (struct strbuf *)(call->udata.len? &call->udata: NULL), 0) < 0) { if (errno == EAGAIN) t_errno = TFLOW; else t_errno = TSYSERR; goto err_out; } } else { strfdinsert.ctlbuf.maxlen = ctlbuf.maxlen; strfdinsert.ctlbuf.len = ctlbuf.len; strfdinsert.ctlbuf.buf = ctlbuf.buf; strfdinsert.databuf.maxlen = call->udata.maxlen; strfdinsert.databuf.len = (call->udata.len? call->udata.len: -1); strfdinsert.databuf.buf = call->udata.buf; strfdinsert.fildes = resfd; strfdinsert.offset = (int)sizeof (t_scalar_t); strfdinsert.flags = 0; /* could be EXPEDITED also */ if (_ioctl(fd, I_FDINSERT, &strfdinsert) < 0) { if (errno == EAGAIN) t_errno = TFLOW; else t_errno = TSYSERR; goto err_out; } } if (_t_is_ok(fd, tiptr, conn_res_prim) < 0) { /* * At the TPI level, the error returned in a T_ERROR_ACK * received in response to a T_CONN_RES for a listener and * acceptor endpoints not being the same kind of endpoints * has changed to a new t_errno code introduced with * XTI (TPROVMISMATCH). We need to adjust TLI error code * to be same as before. */ if (_T_IS_TLI(api_semantics) && t_errno == TPROVMISMATCH) { /* TLI only */ t_errno = TBADF; } goto err_out; } if (tiptr->ti_ocnt == 1) { if (fd == resfd) { _T_TX_NEXTSTATE(T_ACCEPT1, tiptr, "t_accept: invalid state event T_ACCEPT1"); } else { _T_TX_NEXTSTATE(T_ACCEPT2, tiptr, "t_accept: invalid state event T_ACCEPT2"); /* * XXX Here we lock the resfd lock also. This * is an instance of holding two locks without * any enforcement of a locking hiararchy. * There is potential for deadlock in incorrect * or buggy programs here but this is the safer * choice in this case. Correct programs will not * deadlock. */ sig_mutex_lock(&restiptr->ti_lock); _T_TX_NEXTSTATE(T_PASSCON, restiptr, "t_accept: invalid state event T_PASSCON"); sig_mutex_unlock(&restiptr->ti_lock); } } else { _T_TX_NEXTSTATE(T_ACCEPT3, tiptr, "t_accept: invalid state event T_ACCEPT3"); if (fd != resfd) sig_mutex_lock(&restiptr->ti_lock); _T_TX_NEXTSTATE(T_PASSCON, restiptr, "t_accept: invalid state event T_PASSCON"); if (fd != resfd) sig_mutex_unlock(&restiptr->ti_lock); } tiptr->ti_ocnt--; tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED; /* * Update attributes which may have been negotiated during * connection establishment for protocols where we suspect * such negotiation is likely (e.g. OSI). We do not do it for * all endpoints for performance reasons. Also, this code is * deliberately done after user level state changes so even * the (unlikely) failure case reflects a connected endpoint. */ if (restiptr->ti_tsdusize != 0) { if (_t_do_postconn_sync(resfd, restiptr) < 0) goto err_out; } if (didalloc) free(ctlbuf.buf); else tiptr->ti_ctlbuf = ctlbuf.buf; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); return (0); /* NOTREACHED */ err_out: sv_errno = errno; if (didalloc) free(ctlbuf.buf); else tiptr->ti_ctlbuf = ctlbuf.buf; sig_mutex_unlock(&tiptr->ti_lock); (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL); errno = sv_errno; return (-1); }