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glibc/sunrpc/clnt_udp.c

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/* @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC */
/*
* 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(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
#endif
/*
* clnt_udp.c, Implements a UDP/IP based, client side RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <stdio.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpc/clnt.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <errno.h>
#include <rpc/pmap_clnt.h>
extern bool_t xdr_opaque_auth (XDR *, struct opaque_auth *);
/*
* UDP bases client side rpc operations
*/
static enum clnt_stat clntudp_call (CLIENT *, u_long, xdrproc_t, caddr_t,
xdrproc_t, caddr_t, struct timeval);
static void clntudp_abort (void);
static void clntudp_geterr (CLIENT *, struct rpc_err *);
static bool_t clntudp_freeres (CLIENT *, xdrproc_t, caddr_t);
static bool_t clntudp_control (CLIENT *, int, char *);
static void clntudp_destroy (CLIENT *);
static struct clnt_ops udp_ops =
{
clntudp_call,
clntudp_abort,
clntudp_geterr,
clntudp_freeres,
clntudp_destroy,
clntudp_control
};
/*
* Private data kept per client handle
*/
struct cu_data
{
int cu_sock;
bool_t cu_closeit;
struct sockaddr_in cu_raddr;
int cu_rlen;
struct timeval cu_wait;
struct timeval cu_total;
struct rpc_err cu_error;
XDR cu_outxdrs;
u_int cu_xdrpos;
u_int cu_sendsz;
char *cu_outbuf;
u_int cu_recvsz;
char cu_inbuf[1];
};
/*
* Create a UDP based client handle.
* If *sockp<0, *sockp is set to a newly created UPD socket.
* If raddr->sin_port is 0 a binder on the remote machine
* is consulted for the correct port number.
* NB: It is the clients responsibility to close *sockp.
* NB: The rpch->cl_auth is initialized to null authentication.
* Caller may wish to set this something more useful.
*
* wait is the amount of time used between retransmitting a call if
* no response has been heard; retransmission occurs until the actual
* rpc call times out.
*
* sendsz and recvsz are the maximum allowable packet sizes that can be
* sent and received.
*/
CLIENT *
clntudp_bufcreate (raddr, program, version, wait, sockp, sendsz, recvsz)
struct sockaddr_in *raddr;
u_long program;
u_long version;
struct timeval wait;
int *sockp;
u_int sendsz;
u_int recvsz;
{
CLIENT *cl;
struct cu_data *cu = NULL;
struct timeval now;
struct rpc_msg call_msg;
cl = (CLIENT *) mem_alloc (sizeof (CLIENT));
if (cl == NULL)
{
(void) fprintf (stderr, _("clntudp_create: out of memory\n"));
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto fooy;
}
sendsz = ((sendsz + 3) / 4) * 4;
recvsz = ((recvsz + 3) / 4) * 4;
cu = (struct cu_data *) mem_alloc (sizeof (*cu) + sendsz + recvsz);
if (cu == NULL)
{
(void) fprintf (stderr, _("clntudp_create: out of memory\n"));
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto fooy;
}
cu->cu_outbuf = &cu->cu_inbuf[recvsz];
(void) gettimeofday (&now, (struct timezone *) 0);
if (raddr->sin_port == 0)
{
u_short port;
if ((port =
pmap_getport (raddr, program, version, IPPROTO_UDP)) == 0)
{
goto fooy;
}
raddr->sin_port = htons (port);
}
cl->cl_ops = &udp_ops;
cl->cl_private = (caddr_t) cu;
cu->cu_raddr = *raddr;
cu->cu_rlen = sizeof (cu->cu_raddr);
cu->cu_wait = wait;
cu->cu_total.tv_sec = -1;
cu->cu_total.tv_usec = -1;
cu->cu_sendsz = sendsz;
cu->cu_recvsz = recvsz;
call_msg.rm_xid = getpid () ^ now.tv_sec ^ now.tv_usec;
call_msg.rm_direction = CALL;
call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
call_msg.rm_call.cb_prog = program;
call_msg.rm_call.cb_vers = version;
xdrmem_create (&(cu->cu_outxdrs), cu->cu_outbuf,
sendsz, XDR_ENCODE);
if (!xdr_callhdr (&(cu->cu_outxdrs), &call_msg))
{
goto fooy;
}
cu->cu_xdrpos = XDR_GETPOS (&(cu->cu_outxdrs));
if (*sockp < 0)
{
int dontblock = 1;
*sockp = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (*sockp < 0)
{
rpc_createerr.cf_stat = RPC_SYSTEMERROR;
rpc_createerr.cf_error.re_errno = errno;
goto fooy;
}
/* attempt to bind to prov port */
(void) bindresvport (*sockp, (struct sockaddr_in *) 0);
/* the sockets rpc controls are non-blocking */
(void) ioctl (*sockp, FIONBIO, (char *) &dontblock);
cu->cu_closeit = TRUE;
}
else
{
cu->cu_closeit = FALSE;
}
cu->cu_sock = *sockp;
cl->cl_auth = authnone_create ();
return cl;
fooy:
if (cu)
mem_free ((caddr_t) cu, sizeof (*cu) + sendsz + recvsz);
if (cl)
mem_free ((caddr_t) cl, sizeof (CLIENT));
return (CLIENT *) NULL;
}
CLIENT *
clntudp_create (raddr, program, version, wait, sockp)
struct sockaddr_in *raddr;
u_long program;
u_long version;
struct timeval wait;
int *sockp;
{
return clntudp_bufcreate (raddr, program, version, wait, sockp,
UDPMSGSIZE, UDPMSGSIZE);
}
static enum clnt_stat
clntudp_call (cl, proc, xargs, argsp, xresults, resultsp, utimeout)
CLIENT *cl; /* client handle */
u_long proc; /* procedure number */
xdrproc_t xargs; /* xdr routine for args */
caddr_t argsp; /* pointer to args */
xdrproc_t xresults; /* xdr routine for results */
caddr_t resultsp; /* pointer to results */
struct timeval utimeout; /* seconds to wait before giving up */
{
struct cu_data *cu = (struct cu_data *) cl->cl_private;
XDR *xdrs;
int outlen = 0;
int inlen;
size_t fromlen;
#ifdef FD_SETSIZE
fd_set readfds;
fd_set mask;
#else
int readfds;
int mask;
#endif /* def FD_SETSIZE */
struct sockaddr_in from;
struct rpc_msg reply_msg;
XDR reply_xdrs;
struct timeval time_waited;
bool_t ok;
int nrefreshes = 2; /* number of times to refresh cred */
struct timeval timeout;
if (cu->cu_total.tv_usec == -1)
{
timeout = utimeout; /* use supplied timeout */
}
else
{
timeout = cu->cu_total; /* use default timeout */
}
time_waited.tv_sec = 0;
time_waited.tv_usec = 0;
call_again:
xdrs = &(cu->cu_outxdrs);
if (xargs == NULL)
goto get_reply;
xdrs->x_op = XDR_ENCODE;
XDR_SETPOS (xdrs, cu->cu_xdrpos);
/*
* the transaction is the first thing in the out buffer
*/
(*(u_short *) (cu->cu_outbuf))++;
if ((!XDR_PUTLONG (xdrs, (long *) &proc)) ||
(!AUTH_MARSHALL (cl->cl_auth, xdrs)) ||
(!(*xargs) (xdrs, argsp)))
return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
outlen = (int) XDR_GETPOS (xdrs);
send_again:
if (sendto (cu->cu_sock, cu->cu_outbuf, outlen, 0,
(struct sockaddr *) &(cu->cu_raddr), cu->cu_rlen)
!= outlen)
{
cu->cu_error.re_errno = errno;
return (cu->cu_error.re_status = RPC_CANTSEND);
}
/*
* Hack to provide rpc-based message passing
*/
if (timeout.tv_sec == 0 && timeout.tv_usec == 0)
{
return (cu->cu_error.re_status = RPC_TIMEDOUT);
}
get_reply:
/*
* 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;
#ifdef FD_SETSIZE
FD_ZERO (&mask);
FD_SET (cu->cu_sock, &mask);
#else
mask = 1 << cu->cu_sock;
#endif /* def FD_SETSIZE */
for (;;)
{
struct timeval cu_wait = cu->cu_wait;
readfds = mask;
switch (select (_rpc_dtablesize (), &readfds, (fd_set*) NULL,
(fd_set*) NULL, &cu_wait))
{
case 0:
time_waited.tv_sec += cu->cu_wait.tv_sec;
time_waited.tv_usec += cu->cu_wait.tv_usec;
while (time_waited.tv_usec >= 1000000)
{
time_waited.tv_sec++;
time_waited.tv_usec -= 1000000;
}
if ((time_waited.tv_sec < timeout.tv_sec) ||
((time_waited.tv_sec == timeout.tv_sec) &&
(time_waited.tv_usec < timeout.tv_usec)))
goto send_again;
return (cu->cu_error.re_status = RPC_TIMEDOUT);
/*
* buggy in other cases because time_waited is not being
* updated.
*/
case -1:
if (errno == EINTR)
continue;
cu->cu_error.re_errno = errno;
return (cu->cu_error.re_status = RPC_CANTRECV);
}
do
{
fromlen = sizeof (struct sockaddr);
inlen = recvfrom (cu->cu_sock, cu->cu_inbuf,
(int) cu->cu_recvsz, 0,
(struct sockaddr *) &from, &fromlen);
}
while (inlen < 0 && errno == EINTR);
if (inlen < 0)
{
if (errno == EWOULDBLOCK)
continue;
cu->cu_error.re_errno = errno;
return (cu->cu_error.re_status = RPC_CANTRECV);
}
if (inlen < 4)
continue;
/* see if reply transaction id matches sent id */
if (*((u_int32_t *) (cu->cu_inbuf)) != *((u_int32_t *) (cu->cu_outbuf)))
continue;
/* we now assume we have the proper reply */
break;
}
/*
* now decode and validate the response
*/
xdrmem_create (&reply_xdrs, cu->cu_inbuf, (u_int) inlen, XDR_DECODE);
ok = xdr_replymsg (&reply_xdrs, &reply_msg);
/* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */
if (ok)
{
_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 */
else
{
/* maybe our credentials need to be refreshed ... */
if (nrefreshes > 0 && AUTH_REFRESH (cl->cl_auth))
{
nrefreshes--;
goto call_again;
}
} /* end of unsuccessful completion */
} /* end of valid reply message */
else
{
cu->cu_error.re_status = RPC_CANTDECODERES;
}
return cu->cu_error.re_status;
}
static void
clntudp_geterr (CLIENT *cl, struct rpc_err *errp)
{
struct cu_data *cu = (struct cu_data *) cl->cl_private;
*errp = cu->cu_error;
}
static bool_t
clntudp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
{
struct cu_data *cu = (struct cu_data *) cl->cl_private;
XDR *xdrs = &(cu->cu_outxdrs);
xdrs->x_op = XDR_FREE;
return (*xdr_res) (xdrs, res_ptr);
}
static void
clntudp_abort (void)
{
}
static bool_t
clntudp_control (CLIENT *cl, int request, char *info)
{
struct cu_data *cu = (struct cu_data *) cl->cl_private;
switch (request)
{
case CLSET_TIMEOUT:
cu->cu_total = *(struct timeval *) info;
break;
case CLGET_TIMEOUT:
*(struct timeval *) info = cu->cu_total;
break;
case CLSET_RETRY_TIMEOUT:
cu->cu_wait = *(struct timeval *) info;
break;
case CLGET_RETRY_TIMEOUT:
*(struct timeval *) info = cu->cu_wait;
break;
case CLGET_SERVER_ADDR:
*(struct sockaddr_in *) info = cu->cu_raddr;
break;
default:
return FALSE;
}
return TRUE;
}
static void
clntudp_destroy (CLIENT *cl)
{
struct cu_data *cu = (struct cu_data *) cl->cl_private;
if (cu->cu_closeit)
{
(void) close (cu->cu_sock);
}
XDR_DESTROY (&(cu->cu_outxdrs));
mem_free ((caddr_t) cu, (sizeof (*cu) + cu->cu_sendsz + cu->cu_recvsz));
mem_free ((caddr_t) cl, sizeof (CLIENT));
}
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