diff options
Diffstat (limited to 'sys/rpc/clnt_vc.c')
| -rw-r--r-- | sys/rpc/clnt_vc.c | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/sys/rpc/clnt_vc.c b/sys/rpc/clnt_vc.c new file mode 100644 index 0000000..a92d800 --- /dev/null +++ b/sys/rpc/clnt_vc.c @@ -0,0 +1,827 @@ +/* $NetBSD: clnt_vc.c,v 1.4 2000/07/14 08:40:42 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 + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char *sccsid2 = "@(#)clnt_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro"; +static char *sccsid = "@(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC"; +static char sccsid3[] = "@(#)clnt_vc.c 1.19 89/03/16 Copyr 1988 Sun Micro"; +#endif +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * clnt_tcp.c, Implements a TCP/IP based, client side RPC. + * + * Copyright (C) 1984, Sun Microsystems, Inc. + * + * TCP based RPC supports 'batched calls'. + * A sequence of calls may be batched-up in a send buffer. The rpc call + * return immediately to the client even though the call was not necessarily + * sent. The batching occurs if the results' xdr routine is NULL (0) AND + * the rpc timeout value is zero (see clnt.h, rpc). + * + * Clients should NOT casually batch calls that in fact return results; that is, + * the server side should be aware that a call is batched and not produce any + * return message. Batched calls that produce many result messages can + * deadlock (netlock) the client and the server.... + * + * Now go hang yourself. + */ + +#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/syslog.h> +#include <sys/time.h> +#include <sys/uio.h> + +#include <rpc/rpc.h> +#include "rpc_com.h" + +#define MCALL_MSG_SIZE 24 + +struct cmessage { + struct cmsghdr cmsg; + struct cmsgcred cmcred; +}; + +static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, void *, + xdrproc_t, void *, struct timeval); +static void clnt_vc_geterr(CLIENT *, struct rpc_err *); +static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, void *); +static void clnt_vc_abort(CLIENT *); +static bool_t clnt_vc_control(CLIENT *, u_int, void *); +static void clnt_vc_destroy(CLIENT *); +static bool_t time_not_ok(struct timeval *); +static void clnt_vc_soupcall(struct socket *so, void *arg, int waitflag); + +static struct clnt_ops clnt_vc_ops = { + .cl_call = clnt_vc_call, + .cl_abort = clnt_vc_abort, + .cl_geterr = clnt_vc_geterr, + .cl_freeres = clnt_vc_freeres, + .cl_destroy = clnt_vc_destroy, + .cl_control = clnt_vc_control +}; + +/* + * A pending RPC request which awaits a reply. + */ +struct ct_request { + TAILQ_ENTRY(ct_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(ct_request_list, ct_request); + +struct ct_data { + struct mtx ct_lock; + struct socket *ct_socket; /* connection socket */ + bool_t ct_closeit; /* close it on destroy */ + struct timeval ct_wait; /* wait interval in milliseconds */ + struct sockaddr_storage ct_addr; /* remote addr */ + struct rpc_err ct_error; + uint32_t ct_xid; + char ct_mcallc[MCALL_MSG_SIZE]; /* marshalled callmsg */ + size_t ct_mpos; /* pos after marshal */ + const char *ct_waitchan; + int ct_waitflag; + struct mbuf *ct_record; /* current reply record */ + size_t ct_record_resid; /* how much left of reply to read */ + bool_t ct_record_eor; /* true if reading last fragment */ + struct ct_request_list ct_pending; +}; + +static const char clnt_vc_errstr[] = "%s : %s"; +static const char clnt_vc_str[] = "clnt_vc_create"; +static const char clnt_read_vc_str[] = "read_vc"; +static const char __no_mem_str[] = "out of memory"; + +/* + * Create a client handle for a connection. + * Default options are set, which the user can change using clnt_control()'s. + * The rpc/vc package does buffering similar to stdio, so the client + * must pick send and receive buffer sizes, 0 => use the default. + * NB: fd is copied into a private area. + * NB: The rpch->cl_auth is set null authentication. Caller may wish to + * set this something more useful. + * + * fd should be an open socket + */ +CLIENT * +clnt_vc_create( + struct socket *so, /* open file descriptor */ + struct sockaddr *raddr, /* servers address */ + const rpcprog_t prog, /* program number */ + const rpcvers_t vers, /* version number */ + size_t sendsz, /* buffer recv size */ + size_t recvsz) /* buffer send size */ +{ + CLIENT *cl; /* client handle */ + struct ct_data *ct = NULL; /* client handle */ + struct timeval now; + struct rpc_msg call_msg; + static uint32_t disrupt; + struct __rpc_sockinfo si; + XDR xdrs; + int error; + + if (disrupt == 0) + disrupt = (uint32_t)(long)raddr; + + cl = (CLIENT *)mem_alloc(sizeof (*cl)); + ct = (struct ct_data *)mem_alloc(sizeof (*ct)); + + mtx_init(&ct->ct_lock, "ct->ct_lock", NULL, MTX_DEF); + + if ((so->so_state & (SS_ISCONNECTED|SS_ISCONFIRMING)) == 0) { + error = soconnect(so, raddr, curthread); + if (error) { + rpc_createerr.cf_stat = RPC_SYSTEMERROR; + rpc_createerr.cf_error.re_errno = error; + goto err; + } + } + + if (!__rpc_socket2sockinfo(so, &si)) + goto err; + + ct->ct_closeit = FALSE; + + /* + * Set up private data struct + */ + ct->ct_socket = so; + ct->ct_wait.tv_sec = -1; + ct->ct_wait.tv_usec = -1; + memcpy(&ct->ct_addr, raddr, raddr->sa_len); + + /* + * Initialize call message + */ + getmicrotime(&now); + ct->ct_xid = ((uint32_t)++disrupt) ^ __RPC_GETXID(&now); + call_msg.rm_xid = ct->ct_xid; + call_msg.rm_direction = CALL; + call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; + call_msg.rm_call.cb_prog = (uint32_t)prog; + call_msg.rm_call.cb_vers = (uint32_t)vers; + + /* + * pre-serialize the static part of the call msg and stash it away + */ + xdrmem_create(&xdrs, ct->ct_mcallc, MCALL_MSG_SIZE, + XDR_ENCODE); + if (! xdr_callhdr(&xdrs, &call_msg)) { + if (ct->ct_closeit) { + soclose(ct->ct_socket); + } + goto err; + } + ct->ct_mpos = XDR_GETPOS(&xdrs); + XDR_DESTROY(&xdrs); + ct->ct_waitchan = "rpcrecv"; + ct->ct_waitflag = 0; + + /* + * Create a client handle which uses xdrrec for serialization + * and authnone for authentication. + */ + cl->cl_ops = &clnt_vc_ops; + cl->cl_private = ct; + cl->cl_auth = authnone_create(); + 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); + + SOCKBUF_LOCK(&ct->ct_socket->so_rcv); + ct->ct_socket->so_upcallarg = ct; + ct->ct_socket->so_upcall = clnt_vc_soupcall; + ct->ct_socket->so_rcv.sb_flags |= SB_UPCALL; + SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); + + ct->ct_record = NULL; + ct->ct_record_resid = 0; + TAILQ_INIT(&ct->ct_pending); + return (cl); + +err: + if (cl) { + if (ct) { + mem_free(ct, sizeof (struct ct_data)); + } + if (cl) + mem_free(cl, sizeof (CLIENT)); + } + return ((CLIENT *)NULL); +} + +static enum clnt_stat +clnt_vc_call( + CLIENT *cl, + rpcproc_t proc, + xdrproc_t xdr_args, + void *args_ptr, + xdrproc_t xdr_results, + void *results_ptr, + struct timeval utimeout) +{ + struct ct_data *ct = (struct ct_data *) cl->cl_private; + XDR xdrs; + struct rpc_msg reply_msg; + bool_t ok; + int nrefreshes = 2; /* number of times to refresh cred */ + struct timeval timeout; + uint32_t xid; + struct mbuf *mreq = NULL; + struct ct_request cr; + int error; + + mtx_lock(&ct->ct_lock); + + cr.cr_mrep = NULL; + cr.cr_error = 0; + + if (ct->ct_wait.tv_usec == -1) { + timeout = utimeout; /* use supplied timeout */ + } else { + timeout = ct->ct_wait; /* use default timeout */ + } + +call_again: + mtx_assert(&ct->ct_lock, MA_OWNED); + + ct->ct_xid++; + xid = ct->ct_xid; + + mtx_unlock(&ct->ct_lock); + + /* + * Leave space to pre-pend the record mark. + */ + MGETHDR(mreq, M_WAIT, MT_DATA); + MCLGET(mreq, M_WAIT); + mreq->m_len = 0; + mreq->m_data += sizeof(uint32_t); + m_append(mreq, ct->ct_mpos, ct->ct_mcallc); + + /* + * The XID is the first thing in the request. + */ + *mtod(mreq, uint32_t *) = htonl(xid); + + xdrmbuf_create(&xdrs, mreq, XDR_ENCODE); + + ct->ct_error.re_status = RPC_SUCCESS; + + if ((! XDR_PUTINT32(&xdrs, &proc)) || + (! AUTH_MARSHALL(cl->cl_auth, &xdrs)) || + (! (*xdr_args)(&xdrs, args_ptr))) { + if (ct->ct_error.re_status == RPC_SUCCESS) + ct->ct_error.re_status = RPC_CANTENCODEARGS; + m_freem(mreq); + return (ct->ct_error.re_status); + } + m_fixhdr(mreq); + + /* + * Prepend a record marker containing the packet length. + */ + M_PREPEND(mreq, sizeof(uint32_t), M_WAIT); + *mtod(mreq, uint32_t *) = + htonl(0x80000000 | (mreq->m_pkthdr.len - sizeof(uint32_t))); + + cr.cr_xid = xid; + mtx_lock(&ct->ct_lock); + TAILQ_INSERT_TAIL(&ct->ct_pending, &cr, cr_link); + mtx_unlock(&ct->ct_lock); + + /* + * sosend consumes mreq. + */ + error = sosend(ct->ct_socket, NULL, NULL, mreq, NULL, 0, curthread); + mreq = NULL; + + reply_msg.acpted_rply.ar_verf = _null_auth; + reply_msg.acpted_rply.ar_results.where = results_ptr; + reply_msg.acpted_rply.ar_results.proc = xdr_results; + + mtx_lock(&ct->ct_lock); + + if (error) { + TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link); + + ct->ct_error.re_errno = error; + ct->ct_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 ct->ct_pending. + */ + if (cr.cr_error) { + ct->ct_error.re_errno = cr.cr_error; + ct->ct_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(&ct->ct_pending, &cr, cr_link); + ct->ct_error.re_status = RPC_TIMEDOUT; + goto out; + } + + error = msleep(&cr, &ct->ct_lock, ct->ct_waitflag, ct->ct_waitchan, + tvtohz(&timeout)); + + if (error) { + /* + * The sleep returned an error so our request is still + * on the list. Turn the error code into an + * appropriate client status. + */ + if (cr.cr_xid) + TAILQ_REMOVE(&ct->ct_pending, &cr, cr_link); + ct->ct_error.re_errno = error; + switch (error) { + case EINTR: + ct->ct_error.re_status = RPC_INTR; + break; + case EWOULDBLOCK: + ct->ct_error.re_status = RPC_TIMEDOUT; + break; + default: + ct->ct_error.re_status = RPC_CANTRECV; + } + goto out; + } else { + /* + * 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) { + ct->ct_error.re_errno = cr.cr_error; + ct->ct_error.re_status = RPC_CANTRECV; + goto out; + } + } + +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(&ct->ct_lock); + + xdrmbuf_create(&xdrs, cr.cr_mrep, XDR_DECODE); + ok = xdr_replymsg(&xdrs, &reply_msg); + XDR_DESTROY(&xdrs); + cr.cr_mrep = NULL; + + mtx_lock(&ct->ct_lock); + + if (ok) { + if ((reply_msg.rm_reply.rp_stat == MSG_ACCEPTED) && + (reply_msg.acpted_rply.ar_stat == SUCCESS)) + ct->ct_error.re_status = RPC_SUCCESS; + else + _seterr_reply(&reply_msg, &(ct->ct_error)); + + if (ct->ct_error.re_status == RPC_SUCCESS) { + if (! AUTH_VALIDATE(cl->cl_auth, + &reply_msg.acpted_rply.ar_verf)) { + ct->ct_error.re_status = RPC_AUTHERROR; + ct->ct_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 (ct->ct_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 { + ct->ct_error.re_status = RPC_CANTDECODERES; + } +out: + mtx_assert(&ct->ct_lock, MA_OWNED); + + if (mreq) + m_freem(mreq); + if (cr.cr_mrep) + m_freem(cr.cr_mrep); + + mtx_unlock(&ct->ct_lock); + return (ct->ct_error.re_status); +} + +static void +clnt_vc_geterr(CLIENT *cl, struct rpc_err *errp) +{ + struct ct_data *ct = (struct ct_data *) cl->cl_private; + + *errp = ct->ct_error; +} + +static bool_t +clnt_vc_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_vc_abort(CLIENT *cl) +{ +} + +static bool_t +clnt_vc_control(CLIENT *cl, u_int request, void *info) +{ + struct ct_data *ct = (struct ct_data *)cl->cl_private; + void *infop = info; + + mtx_lock(&ct->ct_lock); + + switch (request) { + case CLSET_FD_CLOSE: + ct->ct_closeit = TRUE; + mtx_unlock(&ct->ct_lock); + return (TRUE); + case CLSET_FD_NCLOSE: + ct->ct_closeit = FALSE; + mtx_unlock(&ct->ct_lock); + return (TRUE); + default: + break; + } + + /* for other requests which use info */ + if (info == NULL) { + mtx_unlock(&ct->ct_lock); + return (FALSE); + } + switch (request) { + case CLSET_TIMEOUT: + if (time_not_ok((struct timeval *)info)) { + mtx_unlock(&ct->ct_lock); + return (FALSE); + } + ct->ct_wait = *(struct timeval *)infop; + break; + case CLGET_TIMEOUT: + *(struct timeval *)infop = ct->ct_wait; + break; + case CLGET_SERVER_ADDR: + (void) memcpy(info, &ct->ct_addr, (size_t)ct->ct_addr.ss_len); + break; + case CLGET_SVC_ADDR: + /* + * Slightly different semantics to userland - we use + * sockaddr instead of netbuf. + */ + memcpy(info, &ct->ct_addr, ct->ct_addr.ss_len); + break; + case CLSET_SVC_ADDR: /* set to new address */ + mtx_unlock(&ct->ct_lock); + return (FALSE); + case CLGET_XID: + *(uint32_t *)info = ct->ct_xid; + break; + case CLSET_XID: + /* This will set the xid of the NEXT call */ + /* decrement by 1 as clnt_vc_call() increments once */ + ct->ct_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 *)(ct->ct_mcallc + + 4 * BYTES_PER_XDR_UNIT)); + break; + + case CLSET_VERS: + *(uint32_t *)(void *)(ct->ct_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 *)(ct->ct_mcallc + + 3 * BYTES_PER_XDR_UNIT)); + break; + + case CLSET_PROG: + *(uint32_t *)(void *)(ct->ct_mcallc + + 3 * BYTES_PER_XDR_UNIT) = + htonl(*(uint32_t *)info); + break; + + case CLSET_WAITCHAN: + ct->ct_waitchan = *(const char **)info; + break; + + case CLGET_WAITCHAN: + *(const char **) info = ct->ct_waitchan; + break; + + case CLSET_INTERRUPTIBLE: + if (*(int *) info) + ct->ct_waitflag = PCATCH; + else + ct->ct_waitflag = 0; + break; + + case CLGET_INTERRUPTIBLE: + if (ct->ct_waitflag) + *(int *) info = TRUE; + else + *(int *) info = FALSE; + break; + + default: + mtx_unlock(&ct->ct_lock); + return (FALSE); + } + + mtx_unlock(&ct->ct_lock); + return (TRUE); +} + +static void +clnt_vc_destroy(CLIENT *cl) +{ + struct ct_data *ct = (struct ct_data *) cl->cl_private; + struct socket *so = NULL; + + mtx_lock(&ct->ct_lock); + + if (ct->ct_socket) { + SOCKBUF_LOCK(&ct->ct_socket->so_rcv); + ct->ct_socket->so_upcallarg = NULL; + ct->ct_socket->so_upcall = NULL; + ct->ct_socket->so_rcv.sb_flags &= ~SB_UPCALL; + SOCKBUF_UNLOCK(&ct->ct_socket->so_rcv); + + KASSERT(!TAILQ_FIRST(&ct->ct_pending), + ("Destroying RPC client with pending RPC requests")); + + if (ct->ct_closeit) { + so = ct->ct_socket; + } + } + + mtx_unlock(&ct->ct_lock); + + mtx_destroy(&ct->ct_lock); + if (so) { + soshutdown(so, SHUT_WR); + soclose(so); + } + mem_free(ct, sizeof(struct ct_data)); + mem_free(cl, sizeof(CLIENT)); +} + +/* + * Make sure that the time is not garbage. -1 value is disallowed. + * Note this is different from time_not_ok in clnt_dg.c + */ +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_vc_soupcall(struct socket *so, void *arg, int waitflag) +{ + struct ct_data *ct = (struct ct_data *) arg; + struct uio uio; + struct mbuf *m; + struct ct_request *cr; + int error, rcvflag, foundreq; + uint32_t xid, header; + + uio.uio_td = curthread; + do { + /* + * If ct_record_resid is zero, we are waiting for a + * record mark. + */ + if (ct->ct_record_resid == 0) { + bool_t do_read; + + /* + * Make sure there is either a whole record + * mark in the buffer or there is some other + * error condition + */ + do_read = FALSE; + SOCKBUF_LOCK(&so->so_rcv); + if (so->so_rcv.sb_cc >= sizeof(uint32_t) + || (so->so_rcv.sb_state & SBS_CANTRCVMORE) + || so->so_error) + do_read = TRUE; + SOCKBUF_UNLOCK(&so->so_rcv); + + if (!do_read) + return; + + uio.uio_resid = sizeof(uint32_t); + m = NULL; + rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; + error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); + + if (error == EWOULDBLOCK) + break; + + /* + * If there was an error, wake up all pending + * requests. + */ + if (error || uio.uio_resid > 0) { + wakeup_all: + mtx_lock(&ct->ct_lock); + if (!error) { + /* + * We must have got EOF trying + * to read from the stream. + */ + error = ECONNRESET; + } + ct->ct_error.re_status = RPC_CANTRECV; + ct->ct_error.re_errno = error; + TAILQ_FOREACH(cr, &ct->ct_pending, cr_link) { + cr->cr_error = error; + wakeup(cr); + } + TAILQ_INIT(&ct->ct_pending); + mtx_unlock(&ct->ct_lock); + break; + } + memcpy(&header, mtod(m, uint32_t *), sizeof(uint32_t)); + header = ntohl(header); + ct->ct_record = NULL; + ct->ct_record_resid = header & 0x7fffffff; + ct->ct_record_eor = ((header & 0x80000000) != 0); + m_freem(m); + } else { + /* + * We have the record mark. Read as much as + * the socket has buffered up to the end of + * this record. + */ + uio.uio_resid = ct->ct_record_resid; + m = NULL; + rcvflag = MSG_DONTWAIT | MSG_SOCALLBCK; + error = soreceive(so, NULL, &uio, &m, NULL, &rcvflag); + + if (error == EWOULDBLOCK) + break; + + if (error || uio.uio_resid == ct->ct_record_resid) + goto wakeup_all; + + /* + * If we have part of the record already, + * chain this bit onto the end. + */ + if (ct->ct_record) + m_last(ct->ct_record)->m_next = m; + else + ct->ct_record = m; + + ct->ct_record_resid = uio.uio_resid; + + /* + * If we have the entire record, see if we can + * match it to a request. + */ + if (ct->ct_record_resid == 0 + && ct->ct_record_eor) { + /* + * The XID is in the first uint32_t of + * the reply. + */ + ct->ct_record = + m_pullup(ct->ct_record, sizeof(xid)); + if (!ct->ct_record) + break; + memcpy(&xid, + mtod(ct->ct_record, uint32_t *), + sizeof(uint32_t)); + xid = ntohl(xid); + + mtx_lock(&ct->ct_lock); + foundreq = 0; + TAILQ_FOREACH(cr, &ct->ct_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_vc_call + * can know not to + * repeat the + * TAILQ_REMOVE. + */ + TAILQ_REMOVE(&ct->ct_pending, + cr, cr_link); + cr->cr_xid = 0; + cr->cr_mrep = ct->ct_record; + cr->cr_error = 0; + foundreq = 1; + wakeup(cr); + break; + } + } + mtx_unlock(&ct->ct_lock); + + if (!foundreq) + m_freem(ct->ct_record); + ct->ct_record = NULL; + } + } + } while (m); +} |
