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freebsd-dev/sys/rpc/clnt_dg.c

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/* $NetBSD: clnt_dg.c,v 1.4 2000/07/14 08:40:41 fvdl Exp $ */
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* Copyright (c) 1986-1991 by Sun Microsystems Inc.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#ident "@(#)clnt_dg.c 1.23 94/04/22 SMI"
static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Implements a connectionless client side RPC.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <rpc/rpc.h>
#include <rpc/rpc_com.h>
#ifdef _FREEFALL_CONFIG
/*
* Disable RPC exponential back-off for FreeBSD.org systems.
*/
#define RPC_MAX_BACKOFF 1 /* second */
#else
#define RPC_MAX_BACKOFF 30 /* seconds */
#endif
static bool_t time_not_ok(struct timeval *);
static enum clnt_stat clnt_dg_call(CLIENT *, rpcproc_t, xdrproc_t, void *,
xdrproc_t, void *, struct timeval);
static void clnt_dg_geterr(CLIENT *, struct rpc_err *);
static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, void *);
static void clnt_dg_abort(CLIENT *);
static bool_t clnt_dg_control(CLIENT *, u_int, void *);
static void clnt_dg_destroy(CLIENT *);
static void clnt_dg_soupcall(struct socket *so, void *arg, int waitflag);
static struct clnt_ops clnt_dg_ops = {
.cl_call = clnt_dg_call,
.cl_abort = clnt_dg_abort,
.cl_geterr = clnt_dg_geterr,
.cl_freeres = clnt_dg_freeres,
.cl_destroy = clnt_dg_destroy,
.cl_control = clnt_dg_control
};
static const char mem_err_clnt_dg[] = "clnt_dg_create: out of memory";
/*
* A pending RPC request which awaits a reply.
*/
struct cu_request {
TAILQ_ENTRY(cu_request) cr_link;
uint32_t cr_xid; /* XID of request */
struct mbuf *cr_mrep; /* reply received by upcall */
int cr_error; /* any error from upcall */
};
TAILQ_HEAD(cu_request_list, cu_request);
#define MCALL_MSG_SIZE 24
/*
* This structure is pointed to by the socket's so_upcallarg
* member. It is separate from the client private data to facilitate
* multiple clients sharing the same socket. The cs_lock mutex is used
* to protect all fields of this structure, the socket's receive
* buffer SOCKBUF_LOCK is used to ensure that exactly one of these
* structures is installed on the socket.
*/
struct cu_socket {
struct mtx cs_lock;
int cs_refs; /* Count of clients */
struct cu_request_list cs_pending; /* Requests awaiting replies */
};
/*
* Private data kept per client handle
*/
struct cu_data {
struct socket *cu_socket; /* connection socket */
bool_t cu_closeit; /* opened by library */
struct sockaddr_storage cu_raddr; /* remote address */
int cu_rlen;
struct timeval cu_wait; /* retransmit interval */
struct timeval cu_total; /* total time for the call */
struct rpc_err cu_error;
uint32_t cu_xid;
char cu_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */
size_t cu_mcalllen;
size_t cu_sendsz; /* send size */
size_t cu_recvsz; /* recv size */
int cu_async;
int cu_connect; /* Use connect(). */
int cu_connected; /* Have done connect(). */
const char *cu_waitchan;
int cu_waitflag;
};
/*
* Connection less client creation returns with client handle parameters.
* Default options are set, which the user can change using clnt_control().
* fd should be open and bound.
* NB: The rpch->cl_auth is initialized to null authentication.
* Caller may wish to set this something more useful.
*
* sendsz and recvsz are the maximum allowable packet sizes that can be
* sent and received. Normally they are the same, but they can be
* changed to improve the program efficiency and buffer allocation.
* If they are 0, use the transport default.
*
* If svcaddr is NULL, returns NULL.
*/
CLIENT *
clnt_dg_create(
struct socket *so,
struct sockaddr *svcaddr, /* servers address */
rpcprog_t program, /* program number */
rpcvers_t version, /* version number */
size_t sendsz, /* buffer recv size */
size_t recvsz) /* buffer send size */
{
CLIENT *cl = NULL; /* client handle */
struct cu_data *cu = NULL; /* private data */
struct cu_socket *cs = NULL;
struct timeval now;
struct rpc_msg call_msg;
struct __rpc_sockinfo si;
XDR xdrs;
if (svcaddr == NULL) {
rpc_createerr.cf_stat = RPC_UNKNOWNADDR;
return (NULL);
}
if (!__rpc_socket2sockinfo(so, &si)) {
rpc_createerr.cf_stat = RPC_TLIERROR;
rpc_createerr.cf_error.re_errno = 0;
return (NULL);
}
/*
* Find the receive and the send size
*/
sendsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)sendsz);
recvsz = __rpc_get_t_size(si.si_af, si.si_proto, (int)recvsz);
if ((sendsz == 0) || (recvsz == 0)) {
rpc_createerr.cf_stat = RPC_TLIERROR; /* XXX */
rpc_createerr.cf_error.re_errno = 0;
return (NULL);
}
cl = mem_alloc(sizeof (CLIENT));
/*
* Should be multiple of 4 for XDR.
*/
sendsz = ((sendsz + 3) / 4) * 4;
recvsz = ((recvsz + 3) / 4) * 4;
cu = mem_alloc(sizeof (*cu));
(void) memcpy(&cu->cu_raddr, svcaddr, (size_t)svcaddr->sa_len);
cu->cu_rlen = svcaddr->sa_len;
/* Other values can also be set through clnt_control() */
cu->cu_wait.tv_sec = 15; /* heuristically chosen */
cu->cu_wait.tv_usec = 0;
cu->cu_total.tv_sec = -1;
cu->cu_total.tv_usec = -1;
cu->cu_sendsz = sendsz;
cu->cu_recvsz = recvsz;
cu->cu_async = FALSE;
cu->cu_connect = FALSE;
cu->cu_connected = FALSE;
cu->cu_waitchan = "rpcrecv";
cu->cu_waitflag = 0;
(void) getmicrotime(&now);
cu->cu_xid = __RPC_GETXID(&now);
call_msg.rm_xid = cu->cu_xid;
call_msg.rm_call.cb_prog = program;
call_msg.rm_call.cb_vers = version;
xdrmem_create(&xdrs, cu->cu_mcallc, MCALL_MSG_SIZE, XDR_ENCODE);
if (! xdr_callhdr(&xdrs, &call_msg)) {
rpc_createerr.cf_stat = RPC_CANTENCODEARGS; /* XXX */
rpc_createerr.cf_error.re_errno = 0;
goto err2;
}
cu->cu_mcalllen = XDR_GETPOS(&xdrs);;
/*
* By default, closeit is always FALSE. It is users responsibility
* to do a close on it, else the user may use clnt_control
* to let clnt_destroy do it for him/her.
*/
cu->cu_closeit = FALSE;
cu->cu_socket = so;
SOCKBUF_LOCK(&so->so_rcv);
recheck_socket:
if (so->so_upcall) {
if (so->so_upcall != clnt_dg_soupcall) {
SOCKBUF_UNLOCK(&so->so_rcv);
printf("clnt_dg_create(): socket already has an incompatible upcall\n");
goto err2;
}
cs = (struct cu_socket *) so->so_upcallarg;
mtx_lock(&cs->cs_lock);
cs->cs_refs++;
mtx_unlock(&cs->cs_lock);
} else {
/*
* We are the first on this socket - allocate the
* structure and install it in the socket.
*/
SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
cs = mem_alloc(sizeof(*cs));
SOCKBUF_LOCK(&cu->cu_socket->so_rcv);
if (so->so_upcall) {
/*
* We have lost a race with some other client.
*/
mem_free(cs, sizeof(*cs));
goto recheck_socket;
}
mtx_init(&cs->cs_lock, "cs->cs_lock", NULL, MTX_DEF);
cs->cs_refs = 1;
TAILQ_INIT(&cs->cs_pending);
so->so_upcallarg = cs;
so->so_upcall = clnt_dg_soupcall;
so->so_rcv.sb_flags |= SB_UPCALL;
}
SOCKBUF_UNLOCK(&so->so_rcv);
cl->cl_ops = &clnt_dg_ops;
cl->cl_private = (caddr_t)(void *)cu;
cl->cl_auth = authnone_create();
cl->cl_tp = NULL;
cl->cl_netid = NULL;
return (cl);
err2:
if (cl) {
mem_free(cl, sizeof (CLIENT));
if (cu)
mem_free(cu, sizeof (*cu));
}
return (NULL);
}
static enum clnt_stat
clnt_dg_call(
CLIENT *cl, /* client handle */
rpcproc_t proc, /* procedure number */
xdrproc_t xargs, /* xdr routine for args */
void *argsp, /* pointer to args */
xdrproc_t xresults, /* xdr routine for results */
void *resultsp, /* pointer to results */
struct timeval utimeout) /* seconds to wait before giving up */
{
struct cu_data *cu = (struct cu_data *)cl->cl_private;
struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg;
XDR xdrs;
struct rpc_msg reply_msg;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
struct timeval timeout;
struct timeval retransmit_time;
struct timeval next_sendtime, starttime, time_waited, tv;
struct sockaddr *sa;
socklen_t salen;
uint32_t xid;
struct mbuf *mreq = NULL;
struct cu_request cr;
int error;
mtx_lock(&cs->cs_lock);
cr.cr_mrep = NULL;
cr.cr_error = 0;
if (cu->cu_total.tv_usec == -1) {
timeout = utimeout; /* use supplied timeout */
} else {
timeout = cu->cu_total; /* use default timeout */
}
if (cu->cu_connect && !cu->cu_connected) {
mtx_unlock(&cs->cs_lock);
error = soconnect(cu->cu_socket,
(struct sockaddr *)&cu->cu_raddr, curthread);
mtx_lock(&cs->cs_lock);
if (error) {
cu->cu_error.re_errno = error;
cu->cu_error.re_status = RPC_CANTSEND;
goto out;
}
cu->cu_connected = 1;
}
if (cu->cu_connected) {
sa = NULL;
salen = 0;
} else {
sa = (struct sockaddr *)&cu->cu_raddr;
salen = cu->cu_rlen;
}
time_waited.tv_sec = 0;
time_waited.tv_usec = 0;
retransmit_time = next_sendtime = cu->cu_wait;
getmicrotime(&starttime);
call_again:
mtx_assert(&cs->cs_lock, MA_OWNED);
cu->cu_xid++;
xid = cu->cu_xid;
send_again:
mtx_unlock(&cs->cs_lock);
MGETHDR(mreq, M_WAIT, MT_DATA);
MCLGET(mreq, M_WAIT);
mreq->m_len = 0;
m_append(mreq, cu->cu_mcalllen, cu->cu_mcallc);
/*
* The XID is the first thing in the request.
*/
*mtod(mreq, uint32_t *) = htonl(xid);
xdrmbuf_create(&xdrs, mreq, XDR_ENCODE);
if (cu->cu_async == TRUE && xargs == NULL)
goto get_reply;
if ((! XDR_PUTINT32(&xdrs, &proc)) ||
(! AUTH_MARSHALL(cl->cl_auth, &xdrs)) ||
(! (*xargs)(&xdrs, argsp))) {
cu->cu_error.re_status = RPC_CANTENCODEARGS;
mtx_lock(&cs->cs_lock);
goto out;
}
m_fixhdr(mreq);
cr.cr_xid = xid;
mtx_lock(&cs->cs_lock);
TAILQ_INSERT_TAIL(&cs->cs_pending, &cr, cr_link);
mtx_unlock(&cs->cs_lock);
/*
* sosend consumes mreq.
*/
error = sosend(cu->cu_socket, sa, NULL, mreq, NULL, 0, curthread);
mreq = NULL;
/*
* sub-optimal code appears here because we have
* some clock time to spare while the packets are in flight.
* (We assume that this is actually only executed once.)
*/
reply_msg.acpted_rply.ar_verf = _null_auth;
reply_msg.acpted_rply.ar_results.where = resultsp;
reply_msg.acpted_rply.ar_results.proc = xresults;
mtx_lock(&cs->cs_lock);
if (error) {
TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link);
cu->cu_error.re_errno = error;
cu->cu_error.re_status = RPC_CANTSEND;
goto out;
}
/*
* Check to see if we got an upcall while waiting for the
* lock. In both these cases, the request has been removed
* from cs->cs_pending.
*/
if (cr.cr_error) {
cu->cu_error.re_errno = cr.cr_error;
cu->cu_error.re_status = RPC_CANTRECV;
goto out;
}
if (cr.cr_mrep) {
goto got_reply;
}
/*
* Hack to provide rpc-based message passing
*/
if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
if (cr.cr_xid)
TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link);
cu->cu_error.re_status = RPC_TIMEDOUT;
goto out;
}
get_reply:
for (;;) {
/* Decide how long to wait. */
if (timevalcmp(&next_sendtime, &timeout, <)) {
tv = next_sendtime;
} else {
tv = timeout;
}
timevalsub(&tv, &time_waited);
if (tv.tv_sec < 0 || tv.tv_usec < 0)
tv.tv_sec = tv.tv_usec = 0;
error = msleep(&cr, &cs->cs_lock, cu->cu_waitflag,
cu->cu_waitchan, tvtohz(&tv));
if (!error) {
/*
* We were woken up by the upcall. If the
* upcall had a receive error, report that,
* otherwise we have a reply.
*/
if (cr.cr_error) {
cu->cu_error.re_errno = cr.cr_error;
cu->cu_error.re_status = RPC_CANTRECV;
goto out;
}
break;
}
/*
* The sleep returned an error so our request is still
* on the list. If we got EWOULDBLOCK, we may want to
* re-send the request.
*/
if (error != EWOULDBLOCK) {
if (cr.cr_xid)
TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link);
cu->cu_error.re_errno = error;
if (error == EINTR)
cu->cu_error.re_status = RPC_INTR;
else
cu->cu_error.re_status = RPC_CANTRECV;
goto out;
}
getmicrotime(&tv);
time_waited = tv;
timevalsub(&time_waited, &starttime);
/* Check for timeout. */
if (timevalcmp(&time_waited, &timeout, >)) {
if (cr.cr_xid)
TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link);
cu->cu_error.re_errno = EWOULDBLOCK;
cu->cu_error.re_status = RPC_TIMEDOUT;
goto out;
}
/* Retransmit if necessary. */
if (timevalcmp(&time_waited, &next_sendtime, >)) {
if (cr.cr_xid)
TAILQ_REMOVE(&cs->cs_pending, &cr, cr_link);
/* update retransmit_time */
if (retransmit_time.tv_sec < RPC_MAX_BACKOFF)
timevaladd(&retransmit_time, &retransmit_time);
timevaladd(&next_sendtime, &retransmit_time);
goto send_again;
}
}
got_reply:
/*
* Now decode and validate the response. We need to drop the
* lock since xdr_replymsg may end up sleeping in malloc.
*/
mtx_unlock(&cs->cs_lock);
xdrmbuf_create(&xdrs, cr.cr_mrep, XDR_DECODE);
ok = xdr_replymsg(&xdrs, &reply_msg);
XDR_DESTROY(&xdrs);
cr.cr_mrep = NULL;
mtx_lock(&cs->cs_lock);
if (ok) {
if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
(reply_msg.acpted_rply.ar_stat == SUCCESS))
cu->cu_error.re_status = RPC_SUCCESS;
else
_seterr_reply(&reply_msg, &(cu->cu_error));
if (cu->cu_error.re_status == RPC_SUCCESS) {
if (! AUTH_VALIDATE(cl->cl_auth,
&reply_msg.acpted_rply.ar_verf)) {
cu->cu_error.re_status = RPC_AUTHERROR;
cu->cu_error.re_why = AUTH_INVALIDRESP;
}
if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
xdrs.x_op = XDR_FREE;
(void) xdr_opaque_auth(&xdrs,
&(reply_msg.acpted_rply.ar_verf));
}
} /* end successful completion */
/*
* If unsuccesful AND error is an authentication error
* then refresh credentials and try again, else break
*/
else if (cu->cu_error.re_status == RPC_AUTHERROR)
/* maybe our credentials need to be refreshed ... */
if (nrefreshes > 0 &&
AUTH_REFRESH(cl->cl_auth, &reply_msg)) {
nrefreshes--;
goto call_again;
}
/* end of unsuccessful completion */
} /* end of valid reply message */
else {
cu->cu_error.re_status = RPC_CANTDECODERES;
}
out:
mtx_assert(&cs->cs_lock, MA_OWNED);
if (mreq)
m_freem(mreq);
if (cr.cr_mrep)
m_freem(cr.cr_mrep);
mtx_unlock(&cs->cs_lock);
return (cu->cu_error.re_status);
}
static void
clnt_dg_geterr(CLIENT *cl, struct rpc_err *errp)
{
struct cu_data *cu = (struct cu_data *)cl->cl_private;
*errp = cu->cu_error;
}
static bool_t
clnt_dg_freeres(CLIENT *cl, xdrproc_t xdr_res, void *res_ptr)
{
XDR xdrs;
bool_t dummy;
xdrs.x_op = XDR_FREE;
dummy = (*xdr_res)(&xdrs, res_ptr);
return (dummy);
}
/*ARGSUSED*/
static void
clnt_dg_abort(CLIENT *h)
{
}
static bool_t
clnt_dg_control(CLIENT *cl, u_int request, void *info)
{
struct cu_data *cu = (struct cu_data *)cl->cl_private;
struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg;
struct sockaddr *addr;
mtx_lock(&cs->cs_lock);
switch (request) {
case CLSET_FD_CLOSE:
cu->cu_closeit = TRUE;
mtx_unlock(&cs->cs_lock);
return (TRUE);
case CLSET_FD_NCLOSE:
cu->cu_closeit = FALSE;
mtx_unlock(&cs->cs_lock);
return (TRUE);
}
/* for other requests which use info */
if (info == NULL) {
mtx_unlock(&cs->cs_lock);
return (FALSE);
}
switch (request) {
case CLSET_TIMEOUT:
if (time_not_ok((struct timeval *)info)) {
mtx_unlock(&cs->cs_lock);
return (FALSE);
}
cu->cu_total = *(struct timeval *)info;
break;
case CLGET_TIMEOUT:
*(struct timeval *)info = cu->cu_total;
break;
case CLSET_RETRY_TIMEOUT:
if (time_not_ok((struct timeval *)info)) {
mtx_unlock(&cs->cs_lock);
return (FALSE);
}
cu->cu_wait = *(struct timeval *)info;
break;
case CLGET_RETRY_TIMEOUT:
*(struct timeval *)info = cu->cu_wait;
break;
case CLGET_SVC_ADDR:
/*
* Slightly different semantics to userland - we use
* sockaddr instead of netbuf.
*/
memcpy(info, &cu->cu_raddr, cu->cu_raddr.ss_len);
break;
case CLSET_SVC_ADDR: /* set to new address */
addr = (struct sockaddr *)info;
(void) memcpy(&cu->cu_raddr, addr, addr->sa_len);
break;
case CLGET_XID:
*(uint32_t *)info = cu->cu_xid;
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
/* decrement by 1 as clnt_dg_call() increments once */
cu->cu_xid = *(uint32_t *)info - 1;
break;
case CLGET_VERS:
/*
* This RELIES on the information that, in the call body,
* the version number field is the fifth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
4 * BYTES_PER_XDR_UNIT));
break;
case CLSET_VERS:
*(uint32_t *)(void *)(cu->cu_mcallc + 4 * BYTES_PER_XDR_UNIT)
= htonl(*(uint32_t *)info);
break;
case CLGET_PROG:
/*
* This RELIES on the information that, in the call body,
* the program number field is the fourth field from the
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(uint32_t *)info =
ntohl(*(uint32_t *)(void *)(cu->cu_mcallc +
3 * BYTES_PER_XDR_UNIT));
break;
case CLSET_PROG:
*(uint32_t *)(void *)(cu->cu_mcallc + 3 * BYTES_PER_XDR_UNIT)
= htonl(*(uint32_t *)info);
break;
case CLSET_ASYNC:
cu->cu_async = *(int *)info;
break;
case CLSET_CONNECT:
cu->cu_connect = *(int *)info;
break;
case CLSET_WAITCHAN:
cu->cu_waitchan = *(const char **)info;
break;
case CLGET_WAITCHAN:
*(const char **) info = cu->cu_waitchan;
break;
case CLSET_INTERRUPTIBLE:
if (*(int *) info)
cu->cu_waitflag = PCATCH;
else
cu->cu_waitflag = 0;
break;
case CLGET_INTERRUPTIBLE:
if (cu->cu_waitflag)
*(int *) info = TRUE;
else
*(int *) info = FALSE;
break;
default:
mtx_unlock(&cs->cs_lock);
return (FALSE);
}
mtx_unlock(&cs->cs_lock);
return (TRUE);
}
static void
clnt_dg_destroy(CLIENT *cl)
{
struct cu_data *cu = (struct cu_data *)cl->cl_private;
struct cu_socket *cs = (struct cu_socket *) cu->cu_socket->so_upcallarg;
struct socket *so = NULL;
bool_t lastsocketref;
SOCKBUF_LOCK(&cu->cu_socket->so_rcv);
mtx_lock(&cs->cs_lock);
cs->cs_refs--;
if (cs->cs_refs == 0) {
cu->cu_socket->so_upcallarg = NULL;
cu->cu_socket->so_upcall = NULL;
cu->cu_socket->so_rcv.sb_flags &= ~SB_UPCALL;
mtx_destroy(&cs->cs_lock);
SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
mem_free(cs, sizeof(*cs));
lastsocketref = TRUE;
} else {
mtx_unlock(&cs->cs_lock);
SOCKBUF_UNLOCK(&cu->cu_socket->so_rcv);
lastsocketref = FALSE;
}
if (cu->cu_closeit) {
KASSERT(lastsocketref, ("clnt_dg_destroy(): closing a socket "
"shared with other clients"));
so = cu->cu_socket;
cu->cu_socket = NULL;
}
if (so)
soclose(so);
if (cl->cl_netid && cl->cl_netid[0])
mem_free(cl->cl_netid, strlen(cl->cl_netid) +1);
if (cl->cl_tp && cl->cl_tp[0])
mem_free(cl->cl_tp, strlen(cl->cl_tp) +1);
mem_free(cu, sizeof (*cu));
mem_free(cl, sizeof (CLIENT));
}
/*
* Make sure that the time is not garbage. -1 value is allowed.
*/
static bool_t
time_not_ok(struct timeval *t)
{
return (t->tv_sec < -1 || t->tv_sec > 100000000 ||
t->tv_usec < -1 || t->tv_usec > 1000000);
}
void
clnt_dg_soupcall(struct socket *so, void *arg, int waitflag)
{
struct cu_socket *cs = (struct cu_socket *) arg;
struct uio uio;
struct mbuf *m;
struct mbuf *control;
struct cu_request *cr;
int error, rcvflag, foundreq;
uint32_t xid;
uio.uio_resid = 1000000000;
uio.uio_td = curthread;
do {
m = NULL;
control = NULL;
rcvflag = MSG_DONTWAIT;
error = soreceive(so, NULL, &uio, &m, &control, &rcvflag);
if (control)
m_freem(control);
if (error == EWOULDBLOCK)
break;
/*
* If there was an error, wake up all pending
* requests.
*/
if (error) {
mtx_lock(&cs->cs_lock);
TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
cr->cr_error = error;
wakeup(cr);
}
TAILQ_INIT(&cs->cs_pending);
mtx_unlock(&cs->cs_lock);
break;
}
/*
* The XID is in the first uint32_t of the reply.
*/
m = m_pullup(m, sizeof(xid));
if (!m)
break;
xid = ntohl(*mtod(m, uint32_t *));
/*
* Attempt to match this reply with a pending request.
*/
mtx_lock(&cs->cs_lock);
foundreq = 0;
TAILQ_FOREACH(cr, &cs->cs_pending, cr_link) {
if (cr->cr_xid == xid) {
/*
* This one matches. We snip it out of
* the pending list and leave the
* reply mbuf in cr->cr_mrep. Set the
* XID to zero so that clnt_dg_call
* can know not to repeat the
* TAILQ_REMOVE.
*/
TAILQ_REMOVE(&cs->cs_pending, cr, cr_link);
cr->cr_xid = 0;
cr->cr_mrep = m;
cr->cr_error = 0;
foundreq = 1;
wakeup(cr);
break;
}
}
mtx_unlock(&cs->cs_lock);
/*
* If we didn't find the matching request, just drop
* it - its probably a repeated reply.
*/
if (!foundreq)
m_freem(m);
} while (m);
}
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