351 lines
8.0 KiB
C
351 lines
8.0 KiB
C
/*
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* Copyright (c) 1995-1999 by Internet Software Consortium
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/* ev_connects.c - implement asynch connect/accept for the eventlib
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* vix 16sep96 [initial]
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*/
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#if !defined(LINT) && !defined(CODECENTER)
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static const char rcsid[] = "$Id: ev_connects.c,v 8.27 2000/11/14 01:10:37 vixie Exp $";
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#endif
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/* Import. */
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#include "port_before.h"
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#include "fd_setsize.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <isc/eventlib.h>
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#include <isc/assertions.h>
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#include "eventlib_p.h"
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#include "port_after.h"
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/* Macros. */
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#define GETXXXNAME(f, s, sa, len) ( \
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(f((s), (&sa), (&len)) >= 0) ? 0 : \
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(errno != EAFNOSUPPORT && errno != EOPNOTSUPP) ? -1 : ( \
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memset(&(sa), 0, sizeof (sa)), \
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(len) = sizeof (sa), \
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(sa).sa_family = AF_UNIX, \
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0 \
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) \
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)
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/* Forward. */
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static void listener(evContext ctx, void *uap, int fd, int evmask);
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static void connector(evContext ctx, void *uap, int fd, int evmask);
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/* Public. */
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int
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evListen(evContext opaqueCtx, int fd, int maxconn,
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evConnFunc func, void *uap, evConnID *id)
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{
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evContext_p *ctx = opaqueCtx.opaque;
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evConn *new;
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int mode;
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OKNEW(new);
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new->flags = EV_CONN_LISTEN;
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OK(mode = fcntl(fd, F_GETFL, NULL)); /* side effect: validate fd. */
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/*
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* Remember the nonblocking status. We assume that either evSelectFD
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* has not been done to this fd, or that if it has then the caller
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* will evCancelConn before they evDeselectFD. If our assumptions
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* are not met, then we might restore the old nonblocking status
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* incorrectly.
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*/
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if ((mode & PORT_NONBLOCK) == 0) {
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OK(fcntl(fd, F_SETFL, mode | PORT_NONBLOCK));
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new->flags |= EV_CONN_BLOCK;
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}
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OK(listen(fd, maxconn));
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if (evSelectFD(opaqueCtx, fd, EV_READ, listener, new, &new->file) < 0){
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int save = errno;
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FREE(new);
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errno = save;
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return (-1);
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}
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new->flags |= EV_CONN_SELECTED;
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new->func = func;
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new->uap = uap;
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new->fd = fd;
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if (ctx->conns != NULL)
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ctx->conns->prev = new;
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new->prev = NULL;
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new->next = ctx->conns;
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ctx->conns = new;
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if (id)
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id->opaque = new;
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return (0);
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}
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int
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evConnect(evContext opaqueCtx, int fd, void *ra, int ralen,
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evConnFunc func, void *uap, evConnID *id)
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{
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evContext_p *ctx = opaqueCtx.opaque;
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evConn *new;
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OKNEW(new);
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new->flags = 0;
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/* Do the select() first to get the socket into nonblocking mode. */
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if (evSelectFD(opaqueCtx, fd, EV_MASK_ALL,
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connector, new, &new->file) < 0) {
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int save = errno;
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FREE(new);
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errno = save;
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return (-1);
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}
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new->flags |= EV_CONN_SELECTED;
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if (connect(fd, ra, ralen) < 0 &&
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errno != EWOULDBLOCK &&
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errno != EAGAIN &&
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errno != EINPROGRESS) {
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int save = errno;
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(void) evDeselectFD(opaqueCtx, new->file);
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FREE(new);
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errno = save;
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return (-1);
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}
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/* No error, or EWOULDBLOCK. select() tells when it's ready. */
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new->func = func;
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new->uap = uap;
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new->fd = fd;
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if (ctx->conns != NULL)
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ctx->conns->prev = new;
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new->prev = NULL;
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new->next = ctx->conns;
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ctx->conns = new;
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if (id)
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id->opaque = new;
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return (0);
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}
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int
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evCancelConn(evContext opaqueCtx, evConnID id) {
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evContext_p *ctx = opaqueCtx.opaque;
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evConn *this = id.opaque;
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evAccept *acc, *nxtacc;
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int mode;
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if ((this->flags & EV_CONN_SELECTED) != 0)
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(void) evDeselectFD(opaqueCtx, this->file);
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if ((this->flags & EV_CONN_BLOCK) != 0) {
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mode = fcntl(this->fd, F_GETFL, NULL);
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if (mode == -1) {
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if (errno != EBADF)
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return (-1);
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} else
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OK(fcntl(this->fd, F_SETFL, mode | PORT_NONBLOCK));
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}
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/* Unlink from ctx->conns. */
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if (this->prev != NULL)
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this->prev->next = this->next;
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else
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ctx->conns = this->next;
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if (this->next != NULL)
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this->next->prev = this->prev;
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/*
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* Remove `this' from the ctx->accepts list (zero or more times).
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*/
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for (acc = HEAD(ctx->accepts), nxtacc = NULL;
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acc != NULL;
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acc = nxtacc)
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{
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nxtacc = NEXT(acc, link);
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if (acc->conn == this) {
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UNLINK(ctx->accepts, acc, link);
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close(acc->fd);
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FREE(acc);
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}
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}
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/* Wrap up and get out. */
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FREE(this);
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return (0);
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}
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int evHold(evContext opaqueCtx, evConnID id) {
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evConn *this = id.opaque;
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if ((this->flags & EV_CONN_LISTEN) == 0) {
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errno = EINVAL;
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return (-1);
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}
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if ((this->flags & EV_CONN_SELECTED) == 0)
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return (0);
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this->flags &= ~EV_CONN_SELECTED;
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return (evDeselectFD(opaqueCtx, this->file));
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}
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int evUnhold(evContext opaqueCtx, evConnID id) {
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evConn *this = id.opaque;
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int ret;
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if ((this->flags & EV_CONN_LISTEN) == 0) {
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errno = EINVAL;
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return (-1);
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}
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if ((this->flags & EV_CONN_SELECTED) != 0)
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return (0);
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ret = evSelectFD(opaqueCtx, this->fd, EV_READ, listener, this,
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&this->file);
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if (ret == 0)
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this->flags |= EV_CONN_SELECTED;
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return (ret);
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}
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int
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evTryAccept(evContext opaqueCtx, evConnID id, int *sys_errno) {
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evContext_p *ctx = opaqueCtx.opaque;
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evConn *conn = id.opaque;
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evAccept *new;
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if ((conn->flags & EV_CONN_LISTEN) == 0) {
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errno = EINVAL;
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return (-1);
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}
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OKNEW(new);
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new->conn = conn;
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new->ralen = sizeof new->ra;
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new->fd = accept(conn->fd, &new->ra.sa, &new->ralen);
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if (new->fd > ctx->highestFD) {
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close(new->fd);
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new->fd = -1;
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new->ioErrno = ENOTSOCK;
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}
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if (new->fd >= 0) {
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new->lalen = sizeof new->la;
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if (GETXXXNAME(getsockname, new->fd, new->la.sa, new->lalen) < 0) {
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new->ioErrno = errno;
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(void) close(new->fd);
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new->fd = -1;
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} else
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new->ioErrno = 0;
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} else {
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new->ioErrno = errno;
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if (errno == EAGAIN || errno == EWOULDBLOCK) {
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FREE(new);
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return (-1);
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}
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}
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INIT_LINK(new, link);
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APPEND(ctx->accepts, new, link);
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*sys_errno = new->ioErrno;
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return (0);
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}
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/* Private. */
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static void
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listener(evContext opaqueCtx, void *uap, int fd, int evmask) {
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evContext_p *ctx = opaqueCtx.opaque;
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evConn *conn = uap;
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union {
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struct sockaddr sa;
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struct sockaddr_in in;
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#ifndef NO_SOCKADDR_UN
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struct sockaddr_un un;
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#endif
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} la, ra;
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int new, lalen = 0, ralen;
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REQUIRE((evmask & EV_READ) != 0);
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ralen = sizeof ra;
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new = accept(fd, &ra.sa, &ralen);
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if (new > ctx->highestFD) {
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close(new);
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new = -1;
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errno = ENOTSOCK;
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}
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if (new >= 0) {
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lalen = sizeof la;
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if (GETXXXNAME(getsockname, new, la.sa, lalen) < 0) {
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int save = errno;
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(void) close(new);
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errno = save;
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new = -1;
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}
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} else if (errno == EAGAIN || errno == EWOULDBLOCK)
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return;
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(*conn->func)(opaqueCtx, conn->uap, new, &la.sa, lalen, &ra.sa, ralen);
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}
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static void
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connector(evContext opaqueCtx, void *uap, int fd, int evmask) {
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evConn *conn = uap;
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union {
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struct sockaddr sa;
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struct sockaddr_in in;
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#ifndef NO_SOCKADDR_UN
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struct sockaddr_un un;
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#endif
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} la, ra;
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int lalen, ralen;
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char buf[1];
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void *conn_uap;
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evConnFunc conn_func;
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evConnID id;
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int socket_errno = 0;
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int optlen;
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lalen = sizeof la;
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ralen = sizeof ra;
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conn_uap = conn->uap;
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conn_func = conn->func;
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id.opaque = conn;
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#ifdef SO_ERROR
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optlen = sizeof socket_errno;
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if (fd < 0 &&
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getsockopt(conn->fd, SOL_SOCKET, SO_ERROR, (char *)&socket_errno,
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&optlen) < 0)
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socket_errno = errno;
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else
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errno = socket_errno;
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#endif
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if (evCancelConn(opaqueCtx, id) < 0 ||
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socket_errno ||
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#ifdef NETREAD_BROKEN
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0 ||
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#else
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read(fd, buf, 0) < 0 ||
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#endif
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GETXXXNAME(getsockname, fd, la.sa, lalen) < 0 ||
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GETXXXNAME(getpeername, fd, ra.sa, ralen) < 0) {
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int save = errno;
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(void) close(fd); /* XXX closing caller's fd */
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errno = save;
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fd = -1;
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}
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(*conn_func)(opaqueCtx, conn_uap, fd, &la.sa, lalen, &ra.sa, ralen);
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}
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