1998-07-28 18:26:04 +02:00
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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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/*
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* svc_unix.c, Server side for TCP/IP based RPC.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* Actually implements two flavors of transporter -
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* a unix rendezvouser (a listener and connection establisher)
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* and a record/unix stream.
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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 <sys/uio.h>
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#include <errno.h>
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#include <stdlib.h>
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/*
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* Ops vector for AF_UNIX based rpc service handle
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*/
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static bool_t svcunix_recv (SVCXPRT *, struct rpc_msg *);
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static enum xprt_stat svcunix_stat (SVCXPRT *);
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static bool_t svcunix_getargs (SVCXPRT *, xdrproc_t, caddr_t);
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static bool_t svcunix_reply (SVCXPRT *, struct rpc_msg *);
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static bool_t svcunix_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
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static void svcunix_destroy (SVCXPRT *);
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static const struct xp_ops svcunix_op =
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{
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svcunix_recv,
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svcunix_stat,
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svcunix_getargs,
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svcunix_reply,
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svcunix_freeargs,
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svcunix_destroy
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};
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/*
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* Ops vector for AF_UNIX rendezvous handler
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*/
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static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
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static enum xprt_stat rendezvous_stat (SVCXPRT *);
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static const struct xp_ops svcunix_rendezvous_op =
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{
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rendezvous_request,
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rendezvous_stat,
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(bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
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(bool_t (*) (SVCXPRT *, struct rpc_msg *)) abort,
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(bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
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svcunix_destroy
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};
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static int readunix (char*, char *, int);
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static int writeunix (char *, char *, int);
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static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function;
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struct unix_rendezvous { /* kept in xprt->xp_p1 */
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u_int sendsize;
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u_int recvsize;
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};
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struct unix_conn { /* kept in xprt->xp_p1 */
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enum xprt_stat strm_stat;
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u_long x_id;
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XDR xdrs;
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char verf_body[MAX_AUTH_BYTES];
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};
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/*
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* Usage:
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* xprt = svcunix_create(sock, send_buf_size, recv_buf_size);
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*
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* Creates, registers, and returns a (rpc) unix based transporter.
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* Once *xprt is initialized, it is registered as a transporter
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* see (svc.h, xprt_register). This routine returns
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* a NULL if a problem occurred.
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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 svcunix_create
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* binds it to an arbitrary port. The routine then starts a unix
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* listener on the socket's associated 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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*
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* Since unix streams do buffered io similar to stdio, the caller can specify
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* how big the send and receive buffers are via the second and third parms;
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* 0 => use the system default.
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*/
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SVCXPRT *
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svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
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{
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bool_t madesock = FALSE;
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SVCXPRT *xprt;
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struct unix_rendezvous *r;
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struct sockaddr_un addr;
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socklen_t len = sizeof (struct sockaddr_in);
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if (sock == RPC_ANYSOCK)
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{
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if ((sock = __socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
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{
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perror (_("svc_unix.c - AF_UNIX 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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memset (&addr, '\0', sizeof (addr));
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addr.sun_family = AF_UNIX;
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1998-07-31 13:14:46 +02:00
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len = strlen (path) + 1;
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1998-07-28 18:26:04 +02:00
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memcpy (addr.sun_path, path, len);
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len += sizeof (addr.sun_family);
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bind (sock, (struct sockaddr *) &addr, len);
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if (getsockname (sock, (struct sockaddr *) &addr, &len) != 0
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|| listen (sock, 2) != 0)
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{
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perror (_("svc_unix.c - cannot getsockname or listen"));
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if (madesock)
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__close (sock);
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return (SVCXPRT *) NULL;
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}
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r = (struct unix_rendezvous *) mem_alloc (sizeof (*r));
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if (r == NULL)
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{
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fputs (_("svcunix_create: out of memory\n"), stderr);
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return NULL;
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}
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r->sendsize = sendsize;
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r->recvsize = recvsize;
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xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
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if (xprt == NULL)
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{
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fputs (_("svcunix_create: out of memory\n"), stderr);
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return NULL;
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}
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t) r;
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xprt->xp_verf = _null_auth;
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xprt->xp_ops = &svcunix_rendezvous_op;
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xprt->xp_port = -1;
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xprt->xp_sock = sock;
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xprt_register (xprt);
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return xprt;
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}
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/*
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* Like svunix_create(), except the routine takes any *open* UNIX file
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* descriptor as its first input.
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*/
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SVCXPRT *
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svcunixfd_create (int fd, u_int sendsize, u_int recvsize)
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{
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return makefd_xprt (fd, sendsize, recvsize);
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}
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static SVCXPRT *
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internal_function
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makefd_xprt (int fd, u_int sendsize, u_int recvsize)
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{
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SVCXPRT *xprt;
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struct unix_conn *cd;
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xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
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if (xprt == (SVCXPRT *) NULL)
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{
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(void) fputs (_("svc_unix: makefd_xprt: out of memory\n"), stderr);
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goto done;
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}
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cd = (struct unix_conn *) mem_alloc (sizeof (struct unix_conn));
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if (cd == (struct unix_conn *) NULL)
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{
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(void) fputs (_("svc_unix: makefd_xprt: out of memory\n"), stderr);
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mem_free ((char *) xprt, sizeof (SVCXPRT));
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xprt = (SVCXPRT *) NULL;
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goto done;
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}
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cd->strm_stat = XPRT_IDLE;
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xdrrec_create (&(cd->xdrs), sendsize, recvsize,
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(caddr_t) xprt, readunix, writeunix);
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xprt->xp_p2 = NULL;
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xprt->xp_p1 = (caddr_t) cd;
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xprt->xp_verf.oa_base = cd->verf_body;
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xprt->xp_addrlen = 0;
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xprt->xp_ops = &svcunix_op; /* truly deals with calls */
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xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
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xprt->xp_sock = fd;
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xprt_register (xprt);
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done:
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return xprt;
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}
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static bool_t
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rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
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{
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int sock;
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struct unix_rendezvous *r;
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struct sockaddr_un addr;
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struct sockaddr_in in_addr;
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socklen_t len;
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r = (struct unix_rendezvous *) xprt->xp_p1;
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again:
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len = sizeof (struct sockaddr_un);
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if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
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{
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if (errno == EINTR)
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goto again;
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return FALSE;
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}
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/*
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* make a new transporter (re-uses xprt)
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*/
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memset (&in_addr, '\0', sizeof (in_addr));
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in_addr.sin_family = AF_UNIX;
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xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
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xprt->xp_raddr = in_addr;
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xprt->xp_addrlen = len;
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return FALSE; /* there is never an rpc msg to be processed */
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}
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static enum xprt_stat
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rendezvous_stat (SVCXPRT *xprt)
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{
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return XPRT_IDLE;
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}
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static void
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svcunix_destroy (SVCXPRT *xprt)
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{
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struct unix_conn *cd = (struct unix_conn *) xprt->xp_p1;
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xprt_unregister (xprt);
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__close (xprt->xp_sock);
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if (xprt->xp_port != 0)
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{
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/* a rendezvouser socket */
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xprt->xp_port = 0;
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}
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else
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{
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/* an actual connection socket */
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XDR_DESTROY (&(cd->xdrs));
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}
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mem_free ((caddr_t) cd, sizeof (struct unix_conn));
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mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
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}
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struct cmessage {
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struct cmsghdr cmsg;
|
1998-08-08 22:02:34 +02:00
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struct ucred cmcred;
|
1998-07-28 18:26:04 +02:00
|
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};
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/* XXX This is not thread safe, but since the main functions in svc.c
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and the rpcgen generated *_svc functions for the daemon are also not
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thread safe and uses static global variables, it doesn't matter. */
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static struct cmessage cm;
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static int
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__msgread (int sock, void *buf, size_t cnt)
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|
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{
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struct iovec iov[1];
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|
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struct msghdr msg;
|
1998-07-29 16:52:00 +02:00
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int on = 1;
|
1998-07-28 18:26:04 +02:00
|
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iov[0].iov_base = buf;
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iov[0].iov_len = cnt;
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msg.msg_iov = iov;
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msg.msg_iovlen = 1;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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|
msg.msg_control = (caddr_t) &cm;
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|
|
msg.msg_controllen = sizeof (struct cmessage);
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|
|
msg.msg_flags = 0;
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|
|
|
|
1998-08-03 18:47:01 +02:00
|
|
|
#ifdef SO_PASSCRED
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|
|
if (setsockopt (sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)))
|
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|
|
return -1;
|
|
|
|
#endif
|
1998-07-28 18:26:04 +02:00
|
|
|
|
|
|
|
return recvmsg (sock, &msg, 0);
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|
|
|
}
|
|
|
|
|
|
|
|
static int
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|
|
|
__msgwrite (int sock, void *buf, size_t cnt)
|
|
|
|
{
|
1998-08-08 22:02:34 +02:00
|
|
|
#ifndef SCM_CREDENTIALS
|
1998-07-28 18:26:04 +02:00
|
|
|
/* We cannot implement this reliably. */
|
|
|
|
__set_errno (ENOSYS);
|
1998-07-29 16:52:00 +02:00
|
|
|
return -1;
|
1998-07-28 18:26:04 +02:00
|
|
|
#else
|
|
|
|
struct iovec iov[1];
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|
|
|
struct msghdr msg;
|
|
|
|
|
|
|
|
iov[0].iov_base = buf;
|
|
|
|
iov[0].iov_len = cnt;
|
|
|
|
|
1998-08-08 22:02:34 +02:00
|
|
|
cm.cmsg.cmsg_type = SCM_CREDENTIALS;
|
1998-07-28 18:26:04 +02:00
|
|
|
cm.cmsg.cmsg_level = SOL_SOCKET;
|
|
|
|
cm.cmsg.cmsg_len = sizeof (struct cmessage);
|
|
|
|
/* XXX I'm not sure, if we really should use gete?id(), or get?id().
|
|
|
|
It would be much better, if the kernel could pass both to the
|
|
|
|
client. */
|
1998-08-08 22:02:34 +02:00
|
|
|
cm.cmcred.pid = __getpid ();
|
|
|
|
cm.cmcred.uid = __geteuid ();
|
|
|
|
cm.cmcred.gid = __getegid ();
|
1998-07-28 18:26:04 +02:00
|
|
|
|
|
|
|
msg.msg_iov = iov;
|
|
|
|
msg.msg_iovlen = 1;
|
|
|
|
msg.msg_name = NULL;
|
|
|
|
msg.msg_namelen = 0;
|
|
|
|
msg.msg_control = (caddr_t) &cm;
|
|
|
|
msg.msg_controllen = sizeof (struct cmessage);
|
|
|
|
msg.msg_flags = 0;
|
|
|
|
|
|
|
|
return sendmsg (sock, &msg, 0);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* All read operations timeout after 35 seconds.
|
|
|
|
* A timeout is fatal for the connection.
|
|
|
|
*/
|
|
|
|
static struct timeval wait_per_try = {35, 0};
|
|
|
|
|
|
|
|
/*
|
|
|
|
* reads data from the unix connection.
|
|
|
|
* any error is fatal and the connection is closed.
|
|
|
|
* (And a read of zero bytes is a half closed stream => error.)
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
readunix (char *xprtptr, char *buf, int len)
|
|
|
|
{
|
|
|
|
SVCXPRT *xprt = (SVCXPRT *) xprtptr;
|
|
|
|
int sock = xprt->xp_sock;
|
|
|
|
#ifdef FD_SETSIZE
|
|
|
|
fd_set readfds;
|
|
|
|
#else
|
|
|
|
int mask = 1 << sock;
|
|
|
|
int readfds;
|
|
|
|
#endif /* def FD_SETSIZE */
|
|
|
|
while (1)
|
|
|
|
{
|
|
|
|
struct timeval timeout = wait_per_try;
|
|
|
|
readfds = svc_fdset;
|
|
|
|
#ifdef FD_SETSIZE
|
|
|
|
FD_SET (sock, &readfds);
|
|
|
|
#else
|
|
|
|
readfds |= (1 << sock);
|
|
|
|
#endif /* def FD_SETSIZE */
|
|
|
|
if (__select (_rpc_dtablesize (), &readfds, (fd_set *) NULL,
|
|
|
|
(fd_set *) NULL, &timeout) <= 0)
|
|
|
|
{
|
|
|
|
if (errno == EINTR)
|
|
|
|
continue;
|
|
|
|
goto fatal_err;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef FD_SETSIZE
|
|
|
|
if (FD_ISSET (sock, &readfds))
|
|
|
|
#else
|
|
|
|
if (readfds == mask)
|
|
|
|
#endif /* def FD_SETSIZE */
|
|
|
|
break;
|
|
|
|
|
|
|
|
svc_getreqset (&readfds);
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((len = __msgread (sock, buf, len)) > 0)
|
|
|
|
return len;
|
|
|
|
|
|
|
|
fatal_err:
|
|
|
|
((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* writes data to the unix connection.
|
|
|
|
* Any error is fatal and the connection is closed.
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
writeunix (char *xprtptr, char * buf, int len)
|
|
|
|
{
|
|
|
|
SVCXPRT *xprt = (SVCXPRT *) xprtptr;
|
|
|
|
int i, cnt;
|
|
|
|
|
|
|
|
for (cnt = len; cnt > 0; cnt -= i, buf += i)
|
|
|
|
{
|
|
|
|
if ((i = __msgwrite (xprt->xp_sock, buf, cnt)) < 0)
|
|
|
|
{
|
|
|
|
((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
|
|
|
static enum xprt_stat
|
|
|
|
svcunix_stat (SVCXPRT *xprt)
|
|
|
|
{
|
|
|
|
struct unix_conn *cd =
|
|
|
|
(struct unix_conn *) (xprt->xp_p1);
|
|
|
|
|
|
|
|
if (cd->strm_stat == XPRT_DIED)
|
|
|
|
return XPRT_DIED;
|
|
|
|
if (!xdrrec_eof (&(cd->xdrs)))
|
|
|
|
return XPRT_MOREREQS;
|
|
|
|
return XPRT_IDLE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool_t
|
|
|
|
svcunix_recv (SVCXPRT *xprt, struct rpc_msg *msg)
|
|
|
|
{
|
|
|
|
struct unix_conn *cd = (struct unix_conn *) (xprt->xp_p1);
|
|
|
|
XDR *xdrs = &(cd->xdrs);
|
|
|
|
|
|
|
|
xdrs->x_op = XDR_DECODE;
|
|
|
|
xdrrec_skiprecord (xdrs);
|
|
|
|
if (xdr_callmsg (xdrs, msg))
|
|
|
|
{
|
|
|
|
cd->x_id = msg->rm_xid;
|
|
|
|
/* set up verifiers */
|
|
|
|
msg->rm_call.cb_verf.oa_flavor = AUTH_UNIX;
|
|
|
|
msg->rm_call.cb_verf.oa_base = (caddr_t) &cm;
|
|
|
|
msg->rm_call.cb_verf.oa_length = sizeof (cm);
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
cd->strm_stat = XPRT_DIED; /* XXXX */
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool_t
|
|
|
|
svcunix_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
|
|
|
|
{
|
|
|
|
return (*xdr_args) (&(((struct unix_conn *) (xprt->xp_p1))->xdrs),
|
|
|
|
args_ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool_t
|
|
|
|
svcunix_freeargs (xprt, xdr_args, args_ptr)
|
|
|
|
SVCXPRT *xprt;
|
|
|
|
xdrproc_t xdr_args;
|
|
|
|
caddr_t args_ptr;
|
|
|
|
{
|
|
|
|
XDR *xdrs = &(((struct unix_conn *) (xprt->xp_p1))->xdrs);
|
|
|
|
|
|
|
|
xdrs->x_op = XDR_FREE;
|
|
|
|
return (*xdr_args) (xdrs, args_ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool_t
|
|
|
|
svcunix_reply (xprt, msg)
|
|
|
|
SVCXPRT *xprt;
|
|
|
|
struct rpc_msg *msg;
|
|
|
|
{
|
|
|
|
struct unix_conn *cd = (struct unix_conn *) (xprt->xp_p1);
|
|
|
|
XDR *xdrs = &(cd->xdrs);
|
|
|
|
bool_t stat;
|
|
|
|
|
|
|
|
xdrs->x_op = XDR_ENCODE;
|
|
|
|
msg->rm_xid = cd->x_id;
|
|
|
|
stat = xdr_replymsg (xdrs, msg);
|
|
|
|
(void) xdrrec_endofrecord (xdrs, TRUE);
|
|
|
|
return stat;
|
|
|
|
}
|