/* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
/*
* Copyright (c) 2010, Oracle America, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the "Oracle America, Inc." nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
#endif
/*
* 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 "k5-platform.h"
#include <unistd.h>
#include <gssrpc/rpc.h>
#include <sys/socket.h>
#include <port-sockets.h>
#include <socket-utils.h>
/*extern bool_t abort();
extern errno;
*/
#ifndef FD_SETSIZE
#ifdef NBBY
#define NOFILE (sizeof(int) * NBBY)
#else
#define NOFILE (sizeof(int) * 8)
#endif
#endif
/*
* Ops vector for TCP/IP based rpc service handle
*/
static bool_t svctcp_recv(SVCXPRT *, struct rpc_msg *);
static enum xprt_stat svctcp_stat(SVCXPRT *);
static bool_t svctcp_getargs(SVCXPRT *, xdrproc_t, void *);
static bool_t svctcp_reply(SVCXPRT *, struct rpc_msg *);
static bool_t svctcp_freeargs(SVCXPRT *, xdrproc_t, void *);
static void svctcp_destroy(SVCXPRT *);
static struct xp_ops svctcp_op = {
svctcp_recv,
svctcp_stat,
svctcp_getargs,
svctcp_reply,
svctcp_freeargs,
svctcp_destroy
};
/*
* Ops vector for TCP/IP rendezvous handler
*/
static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
static bool_t abortx(void);
static bool_t abortx_getargs(SVCXPRT *, xdrproc_t, void *);
static bool_t abortx_reply(SVCXPRT *, struct rpc_msg *);
static bool_t abortx_freeargs(SVCXPRT *, xdrproc_t, void *);
static enum xprt_stat rendezvous_stat(SVCXPRT *);
static struct xp_ops svctcp_rendezvous_op = {
rendezvous_request,
rendezvous_stat,
abortx_getargs,
abortx_reply,
abortx_freeargs,
svctcp_destroy
};
static int readtcp(char *, caddr_t, int), writetcp(char *, caddr_t, int);
static SVCXPRT *makefd_xprt(int, u_int, u_int);
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(
SOCKET sock,
u_int sendsize,
u_int recvsize)
{
bool_t madesock = FALSE;
SVCXPRT *xprt;
struct tcp_rendezvous *r;
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *)&ss;
socklen_t len;
if (sock == RPC_ANYSOCK) {
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("svctcp_.c - udp socket creation problem");
return ((SVCXPRT *)NULL);
}
set_cloexec_fd(sock);
madesock = TRUE;
memset(&ss, 0, sizeof(ss));
sa->sa_family = AF_INET;
} else {
len = sizeof(struct sockaddr_storage);
if (getsockname(sock, sa, &len) != 0) {
perror("svc_tcp.c - cannot getsockname");
return ((SVCXPRT *)NULL);
}
}
if (bindresvport_sa(sock, sa)) {
sa_setport(sa, 0);
(void)bind(sock, sa, sa_socklen(sa));
}
len = sizeof(struct sockaddr_storage);
if (getsockname(sock, sa, &len) != 0) {
perror("svc_tcp.c - cannot getsockname");
if (madesock)
(void)closesocket(sock);
return ((SVCXPRT *)NULL);
}
if (listen(sock, 2) != 0) {
perror("svctcp_.c - cannot listen");
if (madesock)
(void)closesocket(sock);
return ((SVCXPRT *)NULL);
}
r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
if (r == NULL) {
(void) fprintf(stderr, "svctcp_create: out of memory\n");
return (NULL);
}
r->sendsize = sendsize;
r->recvsize = recvsize;
xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
if (xprt == NULL) {
(void) fprintf(stderr, "svctcp_create: out of memory\n");
return (NULL);
}
xprt->xp_p2 = NULL;
xprt->xp_p1 = (caddr_t)r;
xprt->xp_auth = NULL;
xprt->xp_verf = gssrpc__null_auth;
xprt->xp_ops = &svctcp_rendezvous_op;
xprt->xp_port = sa_getport(sa);
xprt->xp_sock = sock;
xprt->xp_laddrlen = 0;
xprt_register(xprt);
return (xprt);
}
/*
* Like svtcp_create(), except the routine takes any *open* UNIX file
* descriptor as its first input.
*/
SVCXPRT *
svcfd_create(
int fd,
u_int sendsize,
u_int recvsize)
{
return (makefd_xprt(fd, sendsize, recvsize));
}
static SVCXPRT *
makefd_xprt(
int fd,
u_int sendsize,
u_int recvsize)
{
SVCXPRT *xprt;
struct tcp_conn *cd;
#ifdef FD_SETSIZE
if (fd >= FD_SETSIZE) {
(void) fprintf(stderr, "svc_tcp: makefd_xprt: fd too high\n");
xprt = NULL;
goto done;
}
#else
if (fd >= NOFILE) {
(void) fprintf(stderr, "svc_tcp: makefd_xprt: fd too high\n");
xprt = NULL;
goto done;
}
#endif
xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
if (xprt == (SVCXPRT *)NULL) {
(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
goto done;
}
cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
if (cd == (struct tcp_conn *)NULL) {
(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
mem_free((char *) xprt, sizeof(SVCXPRT));
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_p1 = (caddr_t)cd;
xprt->xp_auth = NULL;
xprt->xp_verf.oa_base = cd->verf_body;
xprt->xp_addrlen = 0;
xprt->xp_laddrlen = 0;
xprt->xp_ops = &svctcp_op; /* truely deals with calls */
xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
xprt->xp_sock = fd;
xprt_register(xprt);
done:
return (xprt);
}
static bool_t
rendezvous_request(
SVCXPRT *xprt,
struct rpc_msg *msg)
{
SOCKET sock;
struct tcp_rendezvous *r;
struct sockaddr_in addr, laddr;
socklen_t len, llen;
r = (struct tcp_rendezvous *)xprt->xp_p1;
again:
len = llen = sizeof(struct sockaddr_in);
if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
&len)) < 0) {
if (errno == EINTR)
goto again;
return (FALSE);
}
set_cloexec_fd(sock);
if (getsockname(sock, (struct sockaddr *) &laddr, &llen) < 0)
return (FALSE);
/*
* make a new transporter (re-uses xprt)
*/
xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
if (xprt == NULL) {
(void)closesocket(sock);
return (FALSE);
}
xprt->xp_raddr = addr;
xprt->xp_addrlen = len;
xprt->xp_laddr = laddr;
xprt->xp_laddrlen = llen;
return (FALSE); /* there is never an rpc msg to be processed */
}
static enum xprt_stat
rendezvous_stat(SVCXPRT *xprt)
{
return (XPRT_IDLE);
}
static void
svctcp_destroy(SVCXPRT *xprt)
{
struct tcp_conn *cd = xprt->xp_p1;
xprt_unregister(xprt);
(void)closesocket(xprt->xp_sock);
if (xprt->xp_port != 0) {
/* a rendezvouser socket */
xprt->xp_port = 0;
} else {
/* an actual connection socket */
XDR_DESTROY(&(cd->xdrs));
}
if (xprt->xp_auth != NULL) {
SVCAUTH_DESTROY(xprt->xp_auth);
xprt->xp_auth = NULL;
}
mem_free((caddr_t)cd, sizeof(struct tcp_conn));
mem_free((caddr_t)xprt, sizeof(SVCXPRT));
}
/*
* 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(
char *xprtptr,
caddr_t buf,
int len)
{
SVCXPRT *xprt = (void *)xprtptr;
int sock = xprt->xp_sock;
struct timeval tout;
#ifdef FD_SETSIZE
fd_set mask;
fd_set readfds;
FD_ZERO(&mask);
FD_SET(sock, &mask);
#else
int mask = 1 << sock;
int readfds;
#endif /* def FD_SETSIZE */
#ifdef FD_SETSIZE
#define loopcond (!FD_ISSET(sock, &readfds))
#else
#define loopcond (readfds != mask)
#endif
do {
readfds = mask;
tout = wait_per_try;
if (select(sock + 1, &readfds, (fd_set*)NULL,
(fd_set*)NULL, &tout) <= 0) {
if (errno == EINTR) {
continue;
}
goto fatal_err;
}
} while (loopcond);
if ((len = read(sock, buf, (size_t) 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(
char *xprtptr,
caddr_t buf,
int len)
{
SVCXPRT *xprt = (void *)xprtptr;
int i, cnt;
for (cnt = len; cnt > 0; cnt -= i, buf += i) {
if ((i = write(xprt->xp_sock, buf, (size_t) cnt)) < 0) {
((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
XPRT_DIED;
return (-1);
}
}
return (len);
}
static enum xprt_stat
svctcp_stat(SVCXPRT *xprt)
{
struct tcp_conn *cd = 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(
SVCXPRT *xprt,
struct rpc_msg *msg)
{
struct tcp_conn *cd = xprt->xp_p1;
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(
SVCXPRT *xprt,
xdrproc_t xdr_args,
void *args_ptr)
{
if (! SVCAUTH_UNWRAP(xprt->xp_auth,
&(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
xdr_args, args_ptr)) {
(void)svctcp_freeargs(xprt, xdr_args, args_ptr);
return FALSE;
}
return TRUE;
}
static bool_t
svctcp_freeargs(
SVCXPRT *xprt,
xdrproc_t xdr_args,
void * args_ptr)
{
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(
SVCXPRT *xprt,
struct rpc_msg *msg)
{
struct tcp_conn *cd = xprt->xp_p1;
XDR *xdrs = &cd->xdrs;
bool_t stat;
xdrproc_t xdr_results = NULL;
caddr_t xdr_location = 0;
bool_t has_args;
if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
has_args = TRUE;
xdr_results = msg->acpted_rply.ar_results.proc;
xdr_location = msg->acpted_rply.ar_results.where;
msg->acpted_rply.ar_results.proc = xdr_void;
msg->acpted_rply.ar_results.where = NULL;
} else
has_args = FALSE;
xdrs->x_op = XDR_ENCODE;
msg->rm_xid = cd->x_id;
stat = FALSE;
if (xdr_replymsg(xdrs, msg) &&
(!has_args ||
(SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_results, xdr_location)))) {
stat = TRUE;
}
(void)xdrrec_endofrecord(xdrs, TRUE);
return (stat);
}
static bool_t abortx(void)
{
abort();
return 1;
}
static bool_t abortx_getargs(
SVCXPRT *xprt,
xdrproc_t proc,
void *info)
{
return abortx();
}
static bool_t abortx_reply(SVCXPRT *xprt, struct rpc_msg *msg)
{
return abortx();
}
static bool_t abortx_freeargs(
SVCXPRT *xprt, xdrproc_t proc,
void * info)
{
return abortx();
}