freebsd-dev/contrib/bind/lib/isc/ev_connects.c
Peter Wemm 4e0ffe0bae Import (trimmed) ISC bind-8.1.2-t3b. This will be updated to 8.1.2 on
final release.

Obtained from:  ftp.isc.org
1998-05-03 04:11:49 +00:00

317 lines
7.4 KiB
C

/*
* Copyright (c) 1995, 1996, 1997, 1998 by Internet Software Consortium
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* ev_connects.c - implement asynch connect/accept for the eventlib
* vix 16sep96 [initial]
*/
#if !defined(LINT) && !defined(CODECENTER)
static const char rcsid[] = "$Id: ev_connects.c,v 8.19 1998/03/20 23:26:22 halley Exp $";
#endif
/* Import. */
#include "port_before.h"
#include "fd_setsize.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <isc/eventlib.h>
#include <isc/assertions.h>
#include "eventlib_p.h"
#include "port_after.h"
/* Forward. */
static void listener(evContext ctx, void *uap, int fd, int evmask);
static void connector(evContext ctx, void *uap, int fd, int evmask);
/* Public. */
int
evListen(evContext opaqueCtx, int fd, int maxconn,
evConnFunc func, void *uap, evConnID *id)
{
evContext_p *ctx = opaqueCtx.opaque;
evConn *new;
int mode;
OKNEW(new);
new->flags = EV_CONN_LISTEN;
OK(mode = fcntl(fd, F_GETFL, NULL)); /* side effect: validate fd. */
/*
* Remember the nonblocking status. We assume that either evSelectFD
* has not been done to this fd, or that if it has then the caller
* will evCancelConn before they evDeselectFD. If our assumptions
* are not met, then we might restore the old nonblocking status
* incorrectly.
*/
if ((mode & O_NONBLOCK) == 0) {
OK(fcntl(fd, F_SETFL, mode | O_NONBLOCK));
new->flags |= EV_CONN_BLOCK;
}
OK(listen(fd, maxconn));
if (evSelectFD(opaqueCtx, fd, EV_READ, listener, new, &new->file) < 0){
int save = errno;
FREE(new);
errno = save;
return (-1);
}
new->flags |= EV_CONN_SELECTED;
new->func = func;
new->uap = uap;
new->fd = fd;
if (ctx->conns != NULL)
ctx->conns->prev = new;
new->prev = NULL;
new->next = ctx->conns;
ctx->conns = new;
if (id)
id->opaque = new;
return (0);
}
int
evConnect(evContext opaqueCtx, int fd, void *ra, int ralen,
evConnFunc func, void *uap, evConnID *id)
{
evContext_p *ctx = opaqueCtx.opaque;
evConn *new;
OKNEW(new);
new->flags = 0;
/* Do the select() first to get the socket into nonblocking mode. */
if (evSelectFD(opaqueCtx, fd, EV_MASK_ALL,
connector, new, &new->file) < 0) {
int save = errno;
FREE(new);
errno = save;
return (-1);
}
new->flags |= EV_CONN_SELECTED;
if (connect(fd, ra, ralen) < 0 &&
errno != EWOULDBLOCK &&
errno != EAGAIN &&
errno != EINPROGRESS) {
int save = errno;
(void) evDeselectFD(opaqueCtx, new->file);
FREE(new);
errno = save;
return (-1);
}
/* No error, or EWOULDBLOCK. select() tells when it's ready. */
new->func = func;
new->uap = uap;
new->fd = fd;
if (ctx->conns != NULL)
ctx->conns->prev = new;
new->prev = NULL;
new->next = ctx->conns;
ctx->conns = new;
if (id)
id->opaque = new;
return (0);
}
int
evCancelConn(evContext opaqueCtx, evConnID id) {
evContext_p *ctx = opaqueCtx.opaque;
evConn *this = id.opaque;
evAccept *acc, *nxtacc;
int mode;
if ((this->flags & EV_CONN_SELECTED) != 0)
(void) evDeselectFD(opaqueCtx, this->file);
if ((this->flags & EV_CONN_BLOCK) != 0) {
mode = fcntl(this->fd, F_GETFL, NULL);
if (mode == -1) {
if (errno != EBADF)
return (-1);
} else
OK(fcntl(this->fd, F_SETFL, mode | O_NONBLOCK));
}
/* Unlink from ctx->conns. */
if (this->prev != NULL)
this->prev->next = this->next;
else
ctx->conns = this->next;
if (this->next != NULL)
this->next->prev = this->prev;
/*
* Remove `this' from the ctx->accepts list (zero or more times).
*/
for (acc = HEAD(ctx->accepts), nxtacc = NULL;
acc != NULL;
acc = nxtacc)
{
nxtacc = NEXT(acc, link);
if (acc->conn == this) {
UNLINK(ctx->accepts, acc, link);
close(acc->fd);
FREE(acc);
}
}
/* Wrap up and get out. */
FREE(this);
return (0);
}
int evHold(evContext opaqueCtx, evConnID id) {
evConn *this = id.opaque;
if ((this->flags & EV_CONN_LISTEN) == 0) {
errno = EINVAL;
return (-1);
}
if ((this->flags & EV_CONN_SELECTED) == 0)
return (0);
this->flags &= ~EV_CONN_SELECTED;
return (evDeselectFD(opaqueCtx, this->file));
}
int evUnhold(evContext opaqueCtx, evConnID id) {
evConn *this = id.opaque;
int ret;
if ((this->flags & EV_CONN_LISTEN) == 0) {
errno = EINVAL;
return (-1);
}
if ((this->flags & EV_CONN_SELECTED) != 0)
return (0);
ret = evSelectFD(opaqueCtx, this->fd, EV_READ, listener, this,
&this->file);
if (ret == 0)
this->flags |= EV_CONN_SELECTED;
return (ret);
}
int
evTryAccept(evContext opaqueCtx, evConnID id, int *sys_errno) {
evContext_p *ctx = opaqueCtx.opaque;
evConn *conn = id.opaque;
evAccept *new;
if ((conn->flags & EV_CONN_LISTEN) == 0) {
errno = EINVAL;
return (-1);
}
OKNEW(new);
new->conn = conn;
new->ralen = sizeof new->ra;
new->fd = accept(conn->fd, &new->ra, &new->ralen);
if (new->fd >= 0) {
new->lalen = sizeof new->la;
if (getsockname(new->fd, &new->la, &new->lalen) < 0) {
new->ioErrno = errno;
(void) close(new->fd);
new->fd = -1;
} else
new->ioErrno = 0;
} else {
new->ioErrno = errno;
if (errno == EAGAIN || errno == EWOULDBLOCK) {
FREE(new);
return (-1);
}
}
APPEND(ctx->accepts, new, link);
*sys_errno = new->ioErrno;
return (0);
}
/* Private. */
static void
listener(evContext opaqueCtx, void *uap, int fd, int evmask) {
evContext_p *ctx = opaqueCtx.opaque;
evConn *conn = uap;
struct sockaddr la, ra;
int new, lalen, ralen;
REQUIRE((evmask & EV_READ) != 0);
ralen = sizeof ra;
new = accept(fd, &ra, &ralen);
if (new >= 0) {
lalen = sizeof la;
if (getsockname(new, &la, &lalen) < 0) {
int save = errno;
(void) close(new);
errno = save;
new = -1;
}
} else if (errno == EAGAIN || errno == EWOULDBLOCK)
return;
(*conn->func)(opaqueCtx, conn->uap, new, &la, lalen, &ra, ralen);
}
static void
connector(evContext opaqueCtx, void *uap, int fd, int evmask) {
evContext_p *ctx = opaqueCtx.opaque;
evConn *conn = uap;
struct sockaddr la, ra;
int lalen, ralen;
char buf[1];
void *conn_uap;
evConnFunc conn_func;
evConnID id;
int socket_errno = 0;
int optlen;
lalen = sizeof la;
ralen = sizeof ra;
conn_uap = conn->uap;
conn_func = conn->func;
id.opaque = conn;
#ifdef SO_ERROR
optlen = sizeof socket_errno;
if (fd < 0 &&
getsockopt(conn->fd, SOL_SOCKET, SO_ERROR, (char *)&socket_errno,
&optlen) < 0)
socket_errno = errno;
else
errno = socket_errno;
#endif
if (evCancelConn(opaqueCtx, id) < 0 ||
socket_errno ||
#ifdef NETREAD_BROKEN
0 ||
#else
read(fd, buf, 0) < 0 ||
#endif
getsockname(fd, &la, &lalen) < 0 ||
getpeername(fd, &ra, &ralen) < 0) {
int save = errno;
(void) close(fd); /* XXX closing caller's fd */
errno = save;
fd = -1;
}
(*conn_func)(opaqueCtx, conn_uap, fd, &la, lalen, &ra, ralen);
}