OpenSolaris_b135/ucblib/librpcsoc/svc_tcp.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* svc_tcp.c, Server side for TCP/IP based RPC.
*
* Actually implements two flavors of transporter -
* a tcp rendezvouser (a listner and connection establisher)
* and a record/tcp stream.
*/
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <errno.h>
#include <syslog.h>
#include <malloc.h>
#include <stdio.h>
extern bool_t abort();
extern int errno;
extern SVCXPRT *svc_xprt_alloc();
extern void svc_xprt_free();
extern int _socket(int, int, int);
extern int _bind(int, const struct sockaddr *, int);
extern int _getsockname(int, struct sockaddr *, int *);
extern int _listen(int, int);
extern int _accept(int, struct sockaddr *, int *);
extern int bindresvport(int, struct sockaddr_in *);
static struct xp_ops *svctcp_ops();
static struct xp_ops *svctcp_rendezvous_ops();
static int readtcp(), writetcp();
static SVCXPRT *makefd_xprt();
struct tcp_rendezvous { /* kept in xprt->xp_p1 */
u_int sendsize;
u_int recvsize;
};
struct tcp_conn { /* kept in xprt->xp_p1 */
enum xprt_stat strm_stat;
uint32_t x_id;
XDR xdrs;
char verf_body[MAX_AUTH_BYTES];
};
/*
* Usage:
* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
*
* Creates, registers, and returns a (rpc) tcp based transporter.
* Once *xprt is initialized, it is registered as a transporter
* see (svc.h, xprt_register). This routine returns
* a NULL if a problem occurred.
*
* If sock<0 then a socket is created, else sock is used.
* If the socket, sock is not bound to a port then svctcp_create
* binds it to an arbitrary port. The routine then starts a tcp
* listener on the socket's associated port. In any (successful) case,
* xprt->xp_sock is the registered socket number and xprt->xp_port is the
* associated port number.
*
* Since tcp streams do buffered io similar to stdio, the caller can specify
* how big the send and receive buffers are via the second and third parms;
* 0 => use the system default.
*/
SVCXPRT *
svctcp_create(sock, sendsize, recvsize)
register int sock;
u_int sendsize;
u_int recvsize;
{
bool_t madesock = FALSE;
register SVCXPRT *xprt;
register struct tcp_rendezvous *r;
struct sockaddr_in addr;
int len = sizeof (struct sockaddr_in);
if (sock == RPC_ANYSOCK) {
if ((sock = _socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
(void) syslog(LOG_ERR, "svctcp_create - tcp",
" socket creation problem: %m");
return ((SVCXPRT *)NULL);
}
madesock = TRUE;
}
memset((char *)&addr, 0, sizeof (addr));
addr.sin_family = AF_INET;
if (bindresvport(sock, &addr)) {
addr.sin_port = 0;
(void) _bind(sock, (struct sockaddr *)&addr, len);
}
if ((_getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
(_listen(sock, 2) != 0)) {
(void) syslog(LOG_ERR, "svctcp_create - cannot",
" getsockname or listen: %m");
if (madesock)
(void) close(sock);
return ((SVCXPRT *)NULL);
}
r = (struct tcp_rendezvous *)mem_alloc(sizeof (*r));
if (r == NULL) {
(void) syslog(LOG_ERR, "svctcp_create: out of memory");
if (madesock)
(void) close(sock);
return (NULL);
}
r->sendsize = sendsize;
r->recvsize = recvsize;
xprt = svc_xprt_alloc();
if (xprt == NULL) {
(void) syslog(LOG_ERR, "svctcp_create: out of memory");
mem_free((char *) r, sizeof (*r));
if (madesock)
(void) close(sock);
return (NULL);
}
xprt->xp_p2 = NULL;
xprt->xp_netid = NULL;
xprt->xp_p1 = (caddr_t)r;
xprt->xp_verf = _null_auth;
xprt->xp_ops = svctcp_rendezvous_ops();
xprt->xp_port = ntohs(addr.sin_port);
xprt->xp_sock = sock;
xprt->xp_rtaddr.buf = xprt->xp_raddr;
xprt_register(xprt);
return (xprt);
}
/*
* Like svtcp_create(), except the routine takes any *open* UNIX file
* descriptor as its first input.
*/
SVCXPRT *
svcfd_create(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
return (makefd_xprt(fd, sendsize, recvsize));
}
static SVCXPRT *
makefd_xprt(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
register SVCXPRT *xprt;
register struct tcp_conn *cd;
xprt = svc_xprt_alloc();
if (xprt == (SVCXPRT *)NULL) {
(void) syslog(LOG_ERR, "svc_tcp: makefd_xprt: out of memory");
goto done;
}
cd = (struct tcp_conn *)mem_alloc(sizeof (struct tcp_conn));
if (cd == (struct tcp_conn *)NULL) {
(void) syslog(LOG_ERR, "svc_tcp: makefd_xprt: out of memory");
svc_xprt_free(xprt);
xprt = (SVCXPRT *)NULL;
goto done;
}
cd->strm_stat = XPRT_IDLE;
xdrrec_create(&(cd->xdrs), sendsize, recvsize,
(caddr_t)xprt, readtcp, writetcp);
xprt->xp_p2 = NULL;
xprt->xp_netid = NULL;
xprt->xp_p1 = (caddr_t)cd;
xprt->xp_verf.oa_base = cd->verf_body;
xprt->xp_addrlen = 0;
xprt->xp_ops = svctcp_ops(); /* truely deals with calls */
xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
xprt->xp_sock = fd;
/* to handle svc_getcaller() properly */
xprt->xp_rtaddr.buf = xprt->xp_raddr;
xprt_register(xprt);
done:
return (xprt);
}
static bool_t
rendezvous_request(xprt, rpc_msg)
register SVCXPRT *xprt;
struct rpc_msg *rpc_msg;
{
int sock;
struct tcp_rendezvous *r;
struct sockaddr_in addr;
int len;
r = (struct tcp_rendezvous *)xprt->xp_p1;
again:
len = sizeof (struct sockaddr_in);
if ((sock = _accept(xprt->xp_sock, (struct sockaddr *)&addr,
&len)) < 0) {
if (errno == EINTR)
goto again;
return (FALSE);
}
/*
* make a new transporter (re-uses xprt)
*/
xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
memcpy((char *)&xprt->xp_raddr, (char *)&addr, len);
xprt->xp_addrlen = len;
return (FALSE); /* there is never an rpc msg to be processed */
}
static enum xprt_stat
rendezvous_stat(xprt)
SVCXPRT *xprt;
{
return (XPRT_IDLE);
}
static void
svctcp_destroy(xprt)
register SVCXPRT *xprt;
{
register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
xprt_unregister(xprt);
(void) close(xprt->xp_sock);
if (xprt->xp_port != 0) {
/* a rendezvouser socket */
xprt->xp_port = 0;
} else {
/* an actual connection socket */
XDR_DESTROY(&(cd->xdrs));
}
mem_free((caddr_t)cd, sizeof (struct tcp_conn));
svc_xprt_free(xprt);
}
/*
* 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 tcp conection.
* any error is fatal and the connection is closed.
* (And a read of zero bytes is a half closed stream => error.)
*/
static int
readtcp(xprt, buf, len)
register SVCXPRT *xprt;
caddr_t buf;
register int len;
{
register int sock = xprt->xp_sock;
fd_set mask;
fd_set readfds;
FD_ZERO(&mask);
FD_SET(sock, &mask);
do {
readfds = mask;
if (select(__rpc_dtbsize(), &readfds, NULL, NULL,
&wait_per_try) <= 0) {
if (errno == EINTR) {
continue;
}
goto fatal_err;
}
} while (!FD_ISSET(sock, &readfds));
if ((len = read(sock, buf, len)) > 0) {
return (len);
}
fatal_err:
((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
return (-1);
}
/*
* writes data to the tcp connection.
* Any error is fatal and the connection is closed.
*/
static int
writetcp(xprt, buf, len)
register SVCXPRT *xprt;
caddr_t buf;
int len;
{
register int i, cnt;
for (cnt = len; cnt > 0; cnt -= i, buf += i) {
if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
XPRT_DIED;
return (-1);
}
}
return (len);
}
static enum xprt_stat
svctcp_stat(xprt)
SVCXPRT *xprt;
{
register struct tcp_conn *cd =
(struct tcp_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
svctcp_recv(xprt, msg)
SVCXPRT *xprt;
register struct rpc_msg *msg;
{
register struct tcp_conn *cd =
(struct tcp_conn *)(xprt->xp_p1);
register XDR *xdrs = &(cd->xdrs);
xdrs->x_op = XDR_DECODE;
(void) xdrrec_skiprecord(xdrs);
if (xdr_callmsg(xdrs, msg)) {
cd->x_id = msg->rm_xid;
return (TRUE);
}
return (FALSE);
}
static bool_t
svctcp_getargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
args_ptr));
}
static bool_t
svctcp_freeargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
register XDR *xdrs =
&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
xdrs->x_op = XDR_FREE;
return ((*xdr_args)(xdrs, args_ptr));
}
static bool_t
svctcp_reply(xprt, msg)
SVCXPRT *xprt;
register struct rpc_msg *msg;
{
register struct tcp_conn *cd =
(struct tcp_conn *)(xprt->xp_p1);
register XDR *xdrs = &(cd->xdrs);
register 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);
}
static struct xp_ops *
svctcp_ops()
{
static struct xp_ops ops;
if (ops.xp_recv == NULL) {
ops.xp_recv = svctcp_recv;
ops.xp_stat = svctcp_stat;
ops.xp_getargs = svctcp_getargs;
ops.xp_reply = svctcp_reply;
ops.xp_freeargs = svctcp_freeargs;
ops.xp_destroy = svctcp_destroy;
}
return (&ops);
}
static struct xp_ops *
svctcp_rendezvous_ops()
{
static struct xp_ops ops;
if (ops.xp_recv == NULL) {
ops.xp_recv = rendezvous_request;
ops.xp_stat = rendezvous_stat;
ops.xp_getargs = abort;
ops.xp_reply = abort;
ops.xp_freeargs = abort,
ops.xp_destroy = svctcp_destroy;
}
return (&ops);
}