634 lines
16 KiB
C
634 lines
16 KiB
C
/* @(#)svc_udp.c 2.2 88/07/29 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)svc_udp.c 1.24 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* svc_udp.c,
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* Server side for UDP/IP based RPC. (Does some caching in the hopes of
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* achieving execute-at-most-once semantics.)
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <libintl.h>
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#ifdef IP_PKTINFO
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#include <sys/uio.h>
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#endif
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#ifdef USE_IN_LIBIO
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# include <wchar.h>
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# include <libio/iolibio.h>
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#endif
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#define rpc_buffer(xprt) ((xprt)->xp_p1)
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#ifndef MAX
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#define MAX(a, b) ((a > b) ? a : b)
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#endif
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static bool_t svcudp_recv (SVCXPRT *, struct rpc_msg *);
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static bool_t svcudp_reply (SVCXPRT *, struct rpc_msg *);
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static enum xprt_stat svcudp_stat (SVCXPRT *);
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static bool_t svcudp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
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static bool_t svcudp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
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static void svcudp_destroy (SVCXPRT *);
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static const struct xp_ops svcudp_op =
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{
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svcudp_recv,
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svcudp_stat,
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svcudp_getargs,
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svcudp_reply,
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svcudp_freeargs,
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svcudp_destroy
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};
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static int cache_get (SVCXPRT *, struct rpc_msg *, char **replyp,
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u_long *replylenp);
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static void cache_set (SVCXPRT *xprt, u_long replylen);
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/*
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* kept in xprt->xp_p2
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*/
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struct svcudp_data
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{
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u_int su_iosz; /* byte size of send.recv buffer */
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u_long su_xid; /* transaction id */
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XDR su_xdrs; /* XDR handle */
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char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */
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char *su_cache; /* cached data, NULL if no cache */
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};
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#define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2))
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/*
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* Usage:
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* xprt = svcudp_create(sock);
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*
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* If sock<0 then a socket is created, else sock is used.
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* If the socket, sock is not bound to a port then svcudp_create
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* binds it to an arbitrary port. In any (successful) case,
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* xprt->xp_sock is the registered socket number and xprt->xp_port is the
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* associated port number.
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* Once *xprt is initialized, it is registered as a transporter;
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* see (svc.h, xprt_register).
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* The routines returns NULL if a problem occurred.
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*/
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SVCXPRT *
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svcudp_bufcreate (sock, sendsz, recvsz)
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int sock;
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u_int sendsz, recvsz;
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{
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bool_t madesock = FALSE;
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SVCXPRT *xprt;
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struct svcudp_data *su;
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struct sockaddr_in addr;
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socklen_t len = sizeof (struct sockaddr_in);
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int pad;
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void *buf;
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if (sock == RPC_ANYSOCK)
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{
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if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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{
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perror (_("svcudp_create: socket creation problem"));
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return (SVCXPRT *) NULL;
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}
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madesock = TRUE;
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}
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__bzero ((char *) &addr, sizeof (addr));
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addr.sin_family = AF_INET;
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if (bindresvport (sock, &addr))
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{
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addr.sin_port = 0;
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(void) __bind (sock, (struct sockaddr *) &addr, len);
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}
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if (__getsockname (sock, (struct sockaddr *) &addr, &len) != 0)
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{
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perror (_("svcudp_create - cannot getsockname"));
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if (madesock)
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(void) __close (sock);
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return (SVCXPRT *) NULL;
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}
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xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
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su = (struct svcudp_data *) mem_alloc (sizeof (*su));
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buf = mem_alloc (((MAX (sendsz, recvsz) + 3) / 4) * 4);
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if (xprt == NULL || su == NULL || buf == NULL)
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{
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#ifdef USE_IN_LIBIO
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if (_IO_fwide (stderr, 0) > 0)
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(void) __fwprintf (stderr, L"%s", _("svcudp_create: out of memory\n"));
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else
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#endif
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(void) fputs (_("svcudp_create: out of memory\n"), stderr);
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mem_free (xprt, sizeof (SVCXPRT));
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mem_free (su, sizeof (*su));
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mem_free (buf, ((MAX (sendsz, recvsz) + 3) / 4) * 4);
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return NULL;
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}
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su->su_iosz = ((MAX (sendsz, recvsz) + 3) / 4) * 4;
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rpc_buffer (xprt) = buf;
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INTUSE(xdrmem_create) (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz,
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XDR_DECODE);
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su->su_cache = NULL;
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xprt->xp_p2 = (caddr_t) su;
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xprt->xp_verf.oa_base = su->su_verfbody;
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xprt->xp_ops = &svcudp_op;
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xprt->xp_port = ntohs (addr.sin_port);
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xprt->xp_sock = sock;
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#ifdef IP_PKTINFO
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if ((sizeof (struct iovec) + sizeof (struct msghdr)
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+ sizeof(struct cmsghdr) + sizeof (struct in_pktinfo))
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> sizeof (xprt->xp_pad))
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{
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# ifdef USE_IN_LIBIO
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if (_IO_fwide (stderr, 0) > 0)
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(void) __fwprintf (stderr, L"%s",
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_("svcudp_create: xp_pad is too small for IP_PKTINFO\n"));
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else
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# endif
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(void) fputs (_("svcudp_create: xp_pad is too small for IP_PKTINFO\n"),
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stderr);
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return NULL;
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}
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pad = 1;
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if (__setsockopt (sock, SOL_IP, IP_PKTINFO, (void *) &pad,
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sizeof (pad)) == 0)
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/* Set the padding to all 1s. */
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pad = 0xff;
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else
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#endif
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/* Clear the padding. */
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pad = 0;
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memset (&xprt->xp_pad [0], pad, sizeof (xprt->xp_pad));
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xprt_register (xprt);
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return xprt;
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}
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INTDEF (svcudp_bufcreate)
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SVCXPRT *
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svcudp_create (sock)
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int sock;
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{
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return INTUSE(svcudp_bufcreate) (sock, UDPMSGSIZE, UDPMSGSIZE);
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}
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INTDEF (svcudp_create)
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static enum xprt_stat
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svcudp_stat (xprt)
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SVCXPRT *xprt;
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{
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return XPRT_IDLE;
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}
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static bool_t
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svcudp_recv (xprt, msg)
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SVCXPRT *xprt;
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struct rpc_msg *msg;
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{
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struct svcudp_data *su = su_data (xprt);
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XDR *xdrs = &(su->su_xdrs);
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int rlen;
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char *reply;
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u_long replylen;
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socklen_t len;
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/* It is very tricky when you have IP aliases. We want to make sure
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that we are sending the packet from the IP address where the
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incoming packet is addressed to. H.J. */
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#ifdef IP_PKTINFO
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struct iovec *iovp;
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struct msghdr *mesgp;
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#endif
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again:
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/* FIXME -- should xp_addrlen be a size_t? */
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len = (socklen_t) sizeof(struct sockaddr_in);
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#ifdef IP_PKTINFO
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iovp = (struct iovec *) &xprt->xp_pad [0];
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mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
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if (mesgp->msg_iovlen)
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{
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iovp->iov_base = rpc_buffer (xprt);
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iovp->iov_len = su->su_iosz;
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mesgp->msg_iov = iovp;
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mesgp->msg_iovlen = 1;
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mesgp->msg_name = &(xprt->xp_raddr);
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mesgp->msg_namelen = len;
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mesgp->msg_control = &xprt->xp_pad [sizeof (struct iovec)
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+ sizeof (struct msghdr)];
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mesgp->msg_controllen = sizeof(xprt->xp_pad)
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- sizeof (struct iovec) - sizeof (struct msghdr);
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rlen = __recvmsg (xprt->xp_sock, mesgp, 0);
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if (rlen >= 0)
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{
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struct cmsghdr *cmsg;
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len = mesgp->msg_namelen;
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cmsg = CMSG_FIRSTHDR (mesgp);
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if (cmsg == NULL
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|| CMSG_NXTHDR (mesgp, cmsg) != NULL
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|| cmsg->cmsg_level != SOL_IP
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|| cmsg->cmsg_type != IP_PKTINFO
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|| cmsg->cmsg_len < (sizeof (struct cmsghdr)
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+ sizeof (struct in_pktinfo)))
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{
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/* Not a simple IP_PKTINFO, ignore it. */
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mesgp->msg_control = NULL;
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mesgp->msg_controllen = 0;
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}
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else
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{
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/* It was a simple IP_PKTIFO as we expected, discard the
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interface field. */
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struct in_pktinfo *pkti = (struct in_pktinfo *) CMSG_DATA (cmsg);
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pkti->ipi_ifindex = 0;
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}
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}
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}
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else
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#endif
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rlen = __recvfrom (xprt->xp_sock, rpc_buffer (xprt),
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(int) su->su_iosz, 0,
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(struct sockaddr *) &(xprt->xp_raddr), &len);
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xprt->xp_addrlen = len;
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if (rlen == -1 && errno == EINTR)
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goto again;
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if (rlen < 16) /* < 4 32-bit ints? */
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return FALSE;
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xdrs->x_op = XDR_DECODE;
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XDR_SETPOS (xdrs, 0);
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if (!INTUSE(xdr_callmsg) (xdrs, msg))
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return FALSE;
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su->su_xid = msg->rm_xid;
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if (su->su_cache != NULL)
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{
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if (cache_get (xprt, msg, &reply, &replylen))
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{
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#ifdef IP_PKTINFO
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if (mesgp->msg_iovlen)
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{
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iovp->iov_base = reply;
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iovp->iov_len = replylen;
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(void) __sendmsg (xprt->xp_sock, mesgp, 0);
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}
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else
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#endif
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(void) __sendto (xprt->xp_sock, reply, (int) replylen, 0,
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(struct sockaddr *) &xprt->xp_raddr, len);
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return TRUE;
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}
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}
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return TRUE;
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}
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static bool_t
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svcudp_reply (xprt, msg)
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SVCXPRT *xprt;
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struct rpc_msg *msg;
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{
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struct svcudp_data *su = su_data (xprt);
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XDR *xdrs = &(su->su_xdrs);
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int slen, sent;
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bool_t stat = FALSE;
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#ifdef IP_PKTINFO
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struct iovec *iovp;
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struct msghdr *mesgp;
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#endif
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xdrs->x_op = XDR_ENCODE;
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XDR_SETPOS (xdrs, 0);
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msg->rm_xid = su->su_xid;
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if (INTUSE(xdr_replymsg) (xdrs, msg))
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{
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slen = (int) XDR_GETPOS (xdrs);
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#ifdef IP_PKTINFO
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mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
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if (mesgp->msg_iovlen)
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{
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iovp = (struct iovec *) &xprt->xp_pad [0];
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iovp->iov_base = rpc_buffer (xprt);
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iovp->iov_len = slen;
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sent = __sendmsg (xprt->xp_sock, mesgp, 0);
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}
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else
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#endif
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sent = __sendto (xprt->xp_sock, rpc_buffer (xprt), slen, 0,
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(struct sockaddr *) &(xprt->xp_raddr),
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xprt->xp_addrlen);
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if (sent == slen)
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{
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stat = TRUE;
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if (su->su_cache && slen >= 0)
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{
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cache_set (xprt, (u_long) slen);
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}
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}
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}
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return stat;
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}
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static bool_t
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svcudp_getargs (xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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return (*xdr_args) (&(su_data (xprt)->su_xdrs), args_ptr);
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}
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static bool_t
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svcudp_freeargs (xprt, xdr_args, args_ptr)
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SVCXPRT *xprt;
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xdrproc_t xdr_args;
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caddr_t args_ptr;
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{
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XDR *xdrs = &(su_data (xprt)->su_xdrs);
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xdrs->x_op = XDR_FREE;
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return (*xdr_args) (xdrs, args_ptr);
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}
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static void
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svcudp_destroy (xprt)
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SVCXPRT *xprt;
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{
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struct svcudp_data *su = su_data (xprt);
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xprt_unregister (xprt);
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(void) __close (xprt->xp_sock);
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XDR_DESTROY (&(su->su_xdrs));
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mem_free (rpc_buffer (xprt), su->su_iosz);
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mem_free ((caddr_t) su, sizeof (struct svcudp_data));
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mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
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}
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/***********this could be a separate file*********************/
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/*
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* Fifo cache for udp server
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* Copies pointers to reply buffers into fifo cache
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* Buffers are sent again if retransmissions are detected.
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*/
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#define SPARSENESS 4 /* 75% sparse */
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#ifdef USE_IN_LIBIO
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# define CACHE_PERROR(msg) \
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if (_IO_fwide (stderr, 0) > 0) \
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(void) __fwprintf(stderr, L"%s\n", msg); \
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else \
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(void) fprintf(stderr, "%s\n", msg)
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#else
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# define CACHE_PERROR(msg) \
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(void) fprintf(stderr,"%s\n", msg)
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#endif
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#define ALLOC(type, size) \
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(type *) mem_alloc((unsigned) (sizeof(type) * (size)))
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#define BZERO(addr, type, size) \
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__bzero((char *) addr, sizeof(type) * (int) (size))
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/*
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* An entry in the cache
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*/
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typedef struct cache_node *cache_ptr;
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struct cache_node
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{
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/*
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* Index into cache is xid, proc, vers, prog and address
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*/
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u_long cache_xid;
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u_long cache_proc;
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u_long cache_vers;
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u_long cache_prog;
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struct sockaddr_in cache_addr;
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/*
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* The cached reply and length
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*/
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char *cache_reply;
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u_long cache_replylen;
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/*
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* Next node on the list, if there is a collision
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*/
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cache_ptr cache_next;
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};
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/*
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* The entire cache
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*/
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struct udp_cache
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{
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u_long uc_size; /* size of cache */
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cache_ptr *uc_entries; /* hash table of entries in cache */
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cache_ptr *uc_fifo; /* fifo list of entries in cache */
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u_long uc_nextvictim; /* points to next victim in fifo list */
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u_long uc_prog; /* saved program number */
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u_long uc_vers; /* saved version number */
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u_long uc_proc; /* saved procedure number */
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struct sockaddr_in uc_addr; /* saved caller's address */
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};
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/*
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* the hashing function
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*/
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#define CACHE_LOC(transp, xid) \
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(xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
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/*
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* Enable use of the cache.
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* Note: there is no disable.
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*/
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int
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svcudp_enablecache (SVCXPRT *transp, u_long size)
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|
{
|
|
struct svcudp_data *su = su_data (transp);
|
|
struct udp_cache *uc;
|
|
|
|
if (su->su_cache != NULL)
|
|
{
|
|
CACHE_PERROR (_("enablecache: cache already enabled"));
|
|
return 0;
|
|
}
|
|
uc = ALLOC (struct udp_cache, 1);
|
|
if (uc == NULL)
|
|
{
|
|
CACHE_PERROR (_("enablecache: could not allocate cache"));
|
|
return 0;
|
|
}
|
|
uc->uc_size = size;
|
|
uc->uc_nextvictim = 0;
|
|
uc->uc_entries = ALLOC (cache_ptr, size * SPARSENESS);
|
|
if (uc->uc_entries == NULL)
|
|
{
|
|
CACHE_PERROR (_("enablecache: could not allocate cache data"));
|
|
return 0;
|
|
}
|
|
BZERO (uc->uc_entries, cache_ptr, size * SPARSENESS);
|
|
uc->uc_fifo = ALLOC (cache_ptr, size);
|
|
if (uc->uc_fifo == NULL)
|
|
{
|
|
CACHE_PERROR (_("enablecache: could not allocate cache fifo"));
|
|
return 0;
|
|
}
|
|
BZERO (uc->uc_fifo, cache_ptr, size);
|
|
su->su_cache = (char *) uc;
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set an entry in the cache
|
|
*/
|
|
static void
|
|
cache_set (SVCXPRT *xprt, u_long replylen)
|
|
{
|
|
cache_ptr victim;
|
|
cache_ptr *vicp;
|
|
struct svcudp_data *su = su_data (xprt);
|
|
struct udp_cache *uc = (struct udp_cache *) su->su_cache;
|
|
u_int loc;
|
|
char *newbuf;
|
|
|
|
/*
|
|
* Find space for the new entry, either by
|
|
* reusing an old entry, or by mallocing a new one
|
|
*/
|
|
victim = uc->uc_fifo[uc->uc_nextvictim];
|
|
if (victim != NULL)
|
|
{
|
|
loc = CACHE_LOC (xprt, victim->cache_xid);
|
|
for (vicp = &uc->uc_entries[loc];
|
|
*vicp != NULL && *vicp != victim;
|
|
vicp = &(*vicp)->cache_next)
|
|
;
|
|
if (*vicp == NULL)
|
|
{
|
|
CACHE_PERROR (_("cache_set: victim not found"));
|
|
return;
|
|
}
|
|
*vicp = victim->cache_next; /* remote from cache */
|
|
newbuf = victim->cache_reply;
|
|
}
|
|
else
|
|
{
|
|
victim = ALLOC (struct cache_node, 1);
|
|
if (victim == NULL)
|
|
{
|
|
CACHE_PERROR (_("cache_set: victim alloc failed"));
|
|
return;
|
|
}
|
|
newbuf = mem_alloc (su->su_iosz);
|
|
if (newbuf == NULL)
|
|
{
|
|
CACHE_PERROR (_("cache_set: could not allocate new rpc_buffer"));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Store it away
|
|
*/
|
|
victim->cache_replylen = replylen;
|
|
victim->cache_reply = rpc_buffer (xprt);
|
|
rpc_buffer (xprt) = newbuf;
|
|
INTUSE(xdrmem_create) (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz,
|
|
XDR_ENCODE);
|
|
victim->cache_xid = su->su_xid;
|
|
victim->cache_proc = uc->uc_proc;
|
|
victim->cache_vers = uc->uc_vers;
|
|
victim->cache_prog = uc->uc_prog;
|
|
victim->cache_addr = uc->uc_addr;
|
|
loc = CACHE_LOC (xprt, victim->cache_xid);
|
|
victim->cache_next = uc->uc_entries[loc];
|
|
uc->uc_entries[loc] = victim;
|
|
uc->uc_fifo[uc->uc_nextvictim++] = victim;
|
|
uc->uc_nextvictim %= uc->uc_size;
|
|
}
|
|
|
|
/*
|
|
* Try to get an entry from the cache
|
|
* return 1 if found, 0 if not found
|
|
*/
|
|
static int
|
|
cache_get (xprt, msg, replyp, replylenp)
|
|
SVCXPRT *xprt;
|
|
struct rpc_msg *msg;
|
|
char **replyp;
|
|
u_long *replylenp;
|
|
{
|
|
u_int loc;
|
|
cache_ptr ent;
|
|
struct svcudp_data *su = su_data (xprt);
|
|
struct udp_cache *uc = (struct udp_cache *) su->su_cache;
|
|
|
|
#define EQADDR(a1, a2) (memcmp((char*)&a1, (char*)&a2, sizeof(a1)) == 0)
|
|
|
|
loc = CACHE_LOC (xprt, su->su_xid);
|
|
for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next)
|
|
{
|
|
if (ent->cache_xid == su->su_xid &&
|
|
ent->cache_proc == uc->uc_proc &&
|
|
ent->cache_vers == uc->uc_vers &&
|
|
ent->cache_prog == uc->uc_prog &&
|
|
EQADDR (ent->cache_addr, uc->uc_addr))
|
|
{
|
|
*replyp = ent->cache_reply;
|
|
*replylenp = ent->cache_replylen;
|
|
return 1;
|
|
}
|
|
}
|
|
/*
|
|
* Failed to find entry
|
|
* Remember a few things so we can do a set later
|
|
*/
|
|
uc->uc_proc = msg->rm_call.cb_proc;
|
|
uc->uc_vers = msg->rm_call.cb_vers;
|
|
uc->uc_prog = msg->rm_call.cb_prog;
|
|
memcpy (&uc->uc_addr, &xprt->xp_raddr, sizeof (uc->uc_addr));
|
|
return 0;
|
|
}
|