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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libc/rpc/svc_tcp.c	Lines:	0	160	0.0 %
Date:	2017-11-13	Branches:	0	92	0.0 %


/*	$OpenBSD: svc_tcp.c,v 1.37 2015/11/01 03:45:29 guenther Exp $ */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * 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.
 */

/*
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <errno.h>

#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>

/*
 * Ops vector for TCP/IP based rpc service handle
 */
static bool_t		svctcp_recv(SVCXPRT *xprt, struct rpc_msg *msg);
static enum xprt_stat	svctcp_stat(SVCXPRT *xprt);
static bool_t		svctcp_getargs(SVCXPRT *xprt, xdrproc_t xdr_args,
			    caddr_t args_ptr);
static bool_t		svctcp_reply(SVCXPRT *xprt, struct rpc_msg *msg);
static bool_t		svctcp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args,
			    caddr_t args_ptr);
static void		svctcp_destroy(SVCXPRT *xprt);

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 *xprt, struct rpc_msg *);
static enum xprt_stat	rendezvous_stat(SVCXPRT *xprt);

static struct xp_ops svctcp_rendezvous_op = {
	rendezvous_request,
	rendezvous_stat,
	/* XXX abort illegal in library */
	(bool_t (*)(struct __rpc_svcxprt *, xdrproc_t, caddr_t))abort,
	(bool_t (*)(struct __rpc_svcxprt *, struct rpc_msg *))abort,
	(bool_t (*)(struct __rpc_svcxprt *, xdrproc_t, caddr_t))abort,
	svctcp_destroy
};

static int readtcp(SVCXPRT *xprt, caddr_t buf, int len),
    writetcp(SVCXPRT *xprt, caddr_t buf, int len);
static SVCXPRT *makefd_xprt(int fd, u_int sendsize, u_int recvsize);

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;
	u_long 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(int sock, u_int sendsize, u_int recvsize)
{
	bool_t madesock = FALSE;
	SVCXPRT *xprt;
	struct tcp_rendezvous *r;
	struct sockaddr_in addr;
	socklen_t len = sizeof(struct sockaddr_in);

	if (sock == RPC_ANYSOCK) {
		if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
			return (NULL);
		madesock = TRUE;
	}
	memset(&addr, 0, sizeof (addr));
	addr.sin_len = sizeof(struct sockaddr_in);
	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)) {
		if (madesock)
			(void)close(sock);
		return (NULL);
	}
	r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
	if (r == NULL) {
		if (madesock)
			(void)close(sock);
		return (NULL);
	}
	r->sendsize = sendsize;
	r->recvsize = recvsize;
	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
	if (xprt == NULL) {
		if (madesock)
			(void)close(sock);
		free(r);
		return (NULL);
	}
	xprt->xp_p2 = NULL;
	xprt->xp_p1 = (caddr_t)r;
	xprt->xp_verf = _null_auth;
	xprt->xp_ops = &svctcp_rendezvous_op;
	xprt->xp_port = ntohs(addr.sin_port);
	xprt->xp_sock = sock;
	if (__xprt_register(xprt) == 0) {
		if (madesock)
			(void)close(sock);
		free(r);
		free(xprt);
		return (NULL);
	}
	return (xprt);
}
DEF_WEAK(svctcp_create);

/*
 * 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;

	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
	if (xprt == NULL)
		goto done;
	cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
	if (cd == NULL) {
		mem_free((char *) xprt, sizeof(SVCXPRT));
		xprt = NULL;
		goto done;
	}
	cd->strm_stat = XPRT_IDLE;
	xdrrec_create(&(cd->xdrs), sendsize, recvsize,
	    (caddr_t)xprt, (int(*)(caddr_t, caddr_t, int))readtcp,
	    (int(*)(caddr_t, caddr_t, int))writetcp);
	xprt->xp_p2 = NULL;
	xprt->xp_p1 = (caddr_t)cd;
	xprt->xp_verf.oa_base = cd->verf_body;
	xprt->xp_addrlen = 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;
	if (__xprt_register(xprt) == 0) {
		free(xprt);
		free(cd);
		return (NULL);
	}
    done:
	return (xprt);
}

static bool_t
rendezvous_request(SVCXPRT *xprt, struct rpc_msg *ignored)
{
	int sock;
	struct tcp_rendezvous *r;
	struct sockaddr_in addr;
	socklen_t 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 || errno == EWOULDBLOCK ||
		    errno == ECONNABORTED)
			goto again;
	       return (FALSE);
	}

#ifdef IP_OPTIONS
	{
		struct ipoption opts;
		socklen_t optsize = sizeof(opts);
		int i;

		if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts,
		    &optsize) && optsize != 0) {
			for (i = 0; (char *)&opts.ipopt_list[i] - (char *)&opts <
			    optsize; ) {
				u_char c = (u_char)opts.ipopt_list[i];
				if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
					close(sock);
					return (FALSE);
				}
				if (c == IPOPT_EOL)
					break;
				i += (c == IPOPT_NOP) ? 1 :
				    (u_char)opts.ipopt_list[i+1];
			}
		}
	}
#endif

	/*
	 * XXX careful for ftp bounce attacks. If discovered, close the
	 * socket and look for another connection.
	 */
	if (addr.sin_port == htons(20)) {
		close(sock);
		return (FALSE);
	}

	/*
	 * make a new transporter (re-uses xprt)
	 */
	xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
	xprt->xp_raddr = addr;
	xprt->xp_addrlen = len;
	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 = (struct tcp_conn *)xprt->xp_p1;

	xprt_unregister(xprt);
	if (xprt->xp_sock != -1)
		(void)close(xprt->xp_sock);
	xprt->xp_sock = -1;
	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));
	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(SVCXPRT *xprt, caddr_t buf, int len)
{
	int sock = xprt->xp_sock;
	int delta, nready;
	struct timeval start;
	struct timeval tmp1, tmp2;
	struct pollfd pfd[1];

	/*
	 * All read operations timeout after 35 seconds.
	 * A timeout is fatal for the connection.
	 */
	delta = wait_per_try.tv_sec * 1000;
	gettimeofday(&start, NULL);
	pfd[0].fd = sock;
	pfd[0].events = POLLIN;
	do {
		nready = poll(pfd, 1, delta);
		switch (nready) {
		case -1:
			if (errno != EINTR)
				goto fatal_err;
			gettimeofday(&tmp1, NULL);
			timersub(&tmp1, &start, &tmp2);
			timersub(&wait_per_try, &tmp2, &tmp1);
			if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
				goto fatal_err;
			delta = tmp1.tv_sec * 1000 + tmp1.tv_usec / 1000;
			continue;
		case 0:
			goto fatal_err;
		}
	} while (pfd[0].revents == 0);
	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(SVCXPRT *xprt, caddr_t buf, int len)
{
	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(SVCXPRT *xprt)
{
	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(SVCXPRT *xprt, struct rpc_msg *msg)
{
	struct tcp_conn *cd =
	    (struct tcp_conn *)(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);
	}
	cd->strm_stat = XPRT_DIED;	/* XXX */
	return (FALSE);
}

static bool_t
svctcp_getargs(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(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t 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 =
	    (struct tcp_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);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: svc_tcp.c,v 1.37 2015/11/01 03:45:29 guenther Exp $ */
2
3			/*
4			* Copyright (c) 2010, Oracle America, Inc.
5			*
6			* Redistribution and use in source and binary forms, with or without
7			* modification, are permitted provided that the following conditions are
8			* met:
9			*
10			* * Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* * Redistributions in binary form must reproduce the above
13			* copyright notice, this list of conditions and the following
14			* disclaimer in the documentation and/or other materials
15			* provided with the distribution.
16			* * Neither the name of the "Oracle America, Inc." nor the names of its
17			* contributors may be used to endorse or promote products derived
18			* from this software without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21			* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22			* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23			* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24			* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25			* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27			* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28			* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30			* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31			* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32			*/
33
34			/*
35			* svc_tcp.c, Server side for TCP/IP based RPC.
36			*
37			* Actually implements two flavors of transporter -
38			* a tcp rendezvouser (a listner and connection establisher)
39			* and a record/tcp stream.
40			*/
41
42			#include <stdio.h>
43			#include <stdlib.h>
44			#include <string.h>
45			#include <unistd.h>
46			#include <rpc/rpc.h>
47			#include <sys/socket.h>
48			#include <errno.h>
49
50			#include <netinet/in.h>
51			#include <netinet/ip.h>
52			#include <netinet/ip_var.h>
53
54			/*
55			* Ops vector for TCP/IP based rpc service handle
56			*/
57			static bool_t svctcp_recv(SVCXPRT xprt, struct rpc_msg msg);
58			static enum xprt_stat svctcp_stat(SVCXPRT *xprt);
59			static bool_t svctcp_getargs(SVCXPRT *xprt, xdrproc_t xdr_args,
60			caddr_t args_ptr);
61			static bool_t svctcp_reply(SVCXPRT xprt, struct rpc_msg msg);
62			static bool_t svctcp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args,
63			caddr_t args_ptr);
64			static void svctcp_destroy(SVCXPRT *xprt);
65
66			static struct xp_ops svctcp_op = {
67			svctcp_recv,
68			svctcp_stat,
69			svctcp_getargs,
70			svctcp_reply,
71			svctcp_freeargs,
72			svctcp_destroy
73			};
74
75			/*
76			* Ops vector for TCP/IP rendezvous handler
77			*/
78			static bool_t rendezvous_request(SVCXPRT xprt, struct rpc_msg );
79			static enum xprt_stat rendezvous_stat(SVCXPRT *xprt);
80
81			static struct xp_ops svctcp_rendezvous_op = {
82			rendezvous_request,
83			rendezvous_stat,
84			/* XXX abort illegal in library */
85			(bool_t ()(struct __rpc_svcxprt , xdrproc_t, caddr_t))abort,
86			(bool_t ()(struct __rpc_svcxprt , struct rpc_msg *))abort,
87			(bool_t ()(struct __rpc_svcxprt , xdrproc_t, caddr_t))abort,
88			svctcp_destroy
89			};
90
91			static int readtcp(SVCXPRT *xprt, caddr_t buf, int len),
92			writetcp(SVCXPRT *xprt, caddr_t buf, int len);
93			static SVCXPRT *makefd_xprt(int fd, u_int sendsize, u_int recvsize);
94
95			struct tcp_rendezvous { /* kept in xprt->xp_p1 */
96			u_int sendsize;
97			u_int recvsize;
98			};
99
100			struct tcp_conn { /* kept in xprt->xp_p1 */
101			enum xprt_stat strm_stat;
102			u_long x_id;
103			XDR xdrs;
104			char verf_body[MAX_AUTH_BYTES];
105			};
106
107			/*
108			* Usage:
109			* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
110			*
111			* Creates, registers, and returns a (rpc) tcp based transporter.
112			* Once *xprt is initialized, it is registered as a transporter
113			* see (svc.h, xprt_register). This routine returns
114			* a NULL if a problem occurred.
115			*
116			* If sock<0 then a socket is created, else sock is used.
117			* If the socket, sock is not bound to a port then svctcp_create
118			* binds it to an arbitrary port. The routine then starts a tcp
119			* listener on the socket's associated port. In any (successful) case,
120			* xprt->xp_sock is the registered socket number and xprt->xp_port is the
121			* associated port number.
122			*
123			* Since tcp streams do buffered io similar to stdio, the caller can specify
124			* how big the send and receive buffers are via the second and third parms;
125			* 0 => use the system default.
126			*/
127			SVCXPRT *
128			svctcp_create(int sock, u_int sendsize, u_int recvsize)
129			{
130			bool_t madesock = FALSE;
131			SVCXPRT *xprt;
132			struct tcp_rendezvous *r;
133			struct sockaddr_in addr;
134			socklen_t len = sizeof(struct sockaddr_in);
135
136			if (sock == RPC_ANYSOCK) {
137			if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
138			return (NULL);
139			madesock = TRUE;
140			}
141			memset(&addr, 0, sizeof (addr));
142			addr.sin_len = sizeof(struct sockaddr_in);
143			addr.sin_family = AF_INET;
144			if (bindresvport(sock, &addr)) {
145			addr.sin_port = 0;
146			(void)bind(sock, (struct sockaddr *)&addr, len);
147			}
148			if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) \|\|
149			(listen(sock, 2) != 0)) {
150			if (madesock)
151			(void)close(sock);
152			return (NULL);
153			}
154			r = (struct tcp_rendezvous )mem_alloc(sizeof(r));
155			if (r == NULL) {
156			if (madesock)
157			(void)close(sock);
158			return (NULL);
159			}
160			r->sendsize = sendsize;
161			r->recvsize = recvsize;
162			xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
163			if (xprt == NULL) {
164			if (madesock)
165			(void)close(sock);
166			free(r);
167			return (NULL);
168			}
169			xprt->xp_p2 = NULL;
170			xprt->xp_p1 = (caddr_t)r;
171			xprt->xp_verf = _null_auth;
172			xprt->xp_ops = &svctcp_rendezvous_op;
173			xprt->xp_port = ntohs(addr.sin_port);
174			xprt->xp_sock = sock;
175			if (__xprt_register(xprt) == 0) {
176			if (madesock)
177			(void)close(sock);
178			free(r);
179			free(xprt);
180			return (NULL);
181			}
182			return (xprt);
183			}
184			DEF_WEAK(svctcp_create);
185
186			/*
187			* Like svtcp_create(), except the routine takes any open UNIX file
188			* descriptor as its first input.
189			*/
190			SVCXPRT *
191			svcfd_create(int fd, u_int sendsize, u_int recvsize)
192			{
193
194			return (makefd_xprt(fd, sendsize, recvsize));
195			}
196
197			static SVCXPRT *
198			makefd_xprt(int fd, u_int sendsize, u_int recvsize)
199			{
200			SVCXPRT *xprt;
201			struct tcp_conn *cd;
202
203			xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
204			if (xprt == NULL)
205			goto done;
206			cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
207			if (cd == NULL) {
208			mem_free((char *) xprt, sizeof(SVCXPRT));
209			xprt = NULL;
210			goto done;
211			}
212			cd->strm_stat = XPRT_IDLE;
213			xdrrec_create(&(cd->xdrs), sendsize, recvsize,
214			(caddr_t)xprt, (int(*)(caddr_t, caddr_t, int))readtcp,
215			(int(*)(caddr_t, caddr_t, int))writetcp);
216			xprt->xp_p2 = NULL;
217			xprt->xp_p1 = (caddr_t)cd;
218			xprt->xp_verf.oa_base = cd->verf_body;
219			xprt->xp_addrlen = 0;
220			xprt->xp_ops = &svctcp_op; /* truely deals with calls */
221			xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
222			xprt->xp_sock = fd;
223			if (__xprt_register(xprt) == 0) {
224			free(xprt);
225			free(cd);
226			return (NULL);
227			}
228			done:
229			return (xprt);
230			}
231
232			static bool_t
233			rendezvous_request(SVCXPRT xprt, struct rpc_msg ignored)
234			{
235			int sock;
236			struct tcp_rendezvous *r;
237			struct sockaddr_in addr;
238			socklen_t len;
239
240			r = (struct tcp_rendezvous *)xprt->xp_p1;
241			again:
242			len = sizeof(struct sockaddr_in);
243			if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
244			&len)) < 0) {
245			if (errno == EINTR \|\| errno == EWOULDBLOCK \|\|
246			errno == ECONNABORTED)
247			goto again;
248			return (FALSE);
249			}
250
251			#ifdef IP_OPTIONS
252			{
253			struct ipoption opts;
254			socklen_t optsize = sizeof(opts);
255			int i;
256
257			if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts,
258			&optsize) && optsize != 0) {
259			for (i = 0; (char )&opts.ipopt_list[i] - (char )&opts <
260			optsize; ) {
261			u_char c = (u_char)opts.ipopt_list[i];
262			if (c == IPOPT_LSRR \|\| c == IPOPT_SSRR) {
263			close(sock);
264			return (FALSE);
265			}
266			if (c == IPOPT_EOL)
267			break;
268			i += (c == IPOPT_NOP) ? 1 :
269			(u_char)opts.ipopt_list[i+1];
270			}
271			}
272			}
273			#endif
274
275			/*
276			* XXX careful for ftp bounce attacks. If discovered, close the
277			* socket and look for another connection.
278			*/
279			if (addr.sin_port == htons(20)) {
280			close(sock);
281			return (FALSE);
282			}
283
284			/*
285			* make a new transporter (re-uses xprt)
286			*/
287			xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
288			xprt->xp_raddr = addr;
289			xprt->xp_addrlen = len;
290			return (FALSE); /* there is never an rpc msg to be processed */
291			}
292
293			static enum xprt_stat
294			rendezvous_stat(SVCXPRT *xprt)
295			{
296
297			return (XPRT_IDLE);
298			}
299
300			static void
301			svctcp_destroy(SVCXPRT *xprt)
302			{
303			struct tcp_conn cd = (struct tcp_conn )xprt->xp_p1;
304
305			xprt_unregister(xprt);
306			if (xprt->xp_sock != -1)
307			(void)close(xprt->xp_sock);
308			xprt->xp_sock = -1;
309			if (xprt->xp_port != 0) {
310			/* a rendezvouser socket */
311			xprt->xp_port = 0;
312			} else {
313			/* an actual connection socket */
314			XDR_DESTROY(&(cd->xdrs));
315			}
316			mem_free((caddr_t)cd, sizeof(struct tcp_conn));
317			mem_free((caddr_t)xprt, sizeof(SVCXPRT));
318			}
319
320			/*
321			* All read operations timeout after 35 seconds.
322			* A timeout is fatal for the connection.
323			*/
324			static struct timeval wait_per_try = { 35, 0 };
325
326			/*
327			* reads data from the tcp conection.
328			* any error is fatal and the connection is closed.
329			* (And a read of zero bytes is a half closed stream => error.)
330			*/
331			static int
332			readtcp(SVCXPRT *xprt, caddr_t buf, int len)
333			{
334			int sock = xprt->xp_sock;
335			int delta, nready;
336			struct timeval start;
337			struct timeval tmp1, tmp2;
338			struct pollfd pfd[1];
339
340			/*
341			* All read operations timeout after 35 seconds.
342			* A timeout is fatal for the connection.
343			*/
344			delta = wait_per_try.tv_sec * 1000;
345			gettimeofday(&start, NULL);
346			pfd[0].fd = sock;
347			pfd[0].events = POLLIN;
348			do {
349			nready = poll(pfd, 1, delta);
350			switch (nready) {
351			case -1:
352			if (errno != EINTR)
353			goto fatal_err;
354			gettimeofday(&tmp1, NULL);
355			timersub(&tmp1, &start, &tmp2);
356			timersub(&wait_per_try, &tmp2, &tmp1);
357			if (tmp1.tv_sec < 0 \|\| !timerisset(&tmp1))
358			goto fatal_err;
359			delta = tmp1.tv_sec * 1000 + tmp1.tv_usec / 1000;
360			continue;
361			case 0:
362			goto fatal_err;
363			}
364			} while (pfd[0].revents == 0);
365			if ((len = read(sock, buf, len)) > 0)
366			return (len);
367			fatal_err:
368			((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
369			return (-1);
370			}
371
372			/*
373			* writes data to the tcp connection.
374			* Any error is fatal and the connection is closed.
375			*/
376			static int
377			writetcp(SVCXPRT *xprt, caddr_t buf, int len)
378			{
379			int i, cnt;
380
381			for (cnt = len; cnt > 0; cnt -= i, buf += i) {
382			if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
383			((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
384			XPRT_DIED;
385			return (-1);
386			}
387			}
388			return (len);
389			}
390
391			static enum xprt_stat
392			svctcp_stat(SVCXPRT *xprt)
393			{
394			struct tcp_conn *cd =
395			(struct tcp_conn *)(xprt->xp_p1);
396
397			if (cd->strm_stat == XPRT_DIED)
398			return (XPRT_DIED);
399			if (! xdrrec_eof(&(cd->xdrs)))
400			return (XPRT_MOREREQS);
401			return (XPRT_IDLE);
402			}
403
404			static bool_t
405			svctcp_recv(SVCXPRT xprt, struct rpc_msg msg)
406			{
407			struct tcp_conn *cd =
408			(struct tcp_conn *)(xprt->xp_p1);
409			XDR *xdrs = &(cd->xdrs);
410
411			xdrs->x_op = XDR_DECODE;
412			(void)xdrrec_skiprecord(xdrs);
413			if (xdr_callmsg(xdrs, msg)) {
414			cd->x_id = msg->rm_xid;
415			return (TRUE);
416			}
417			cd->strm_stat = XPRT_DIED; /* XXX */
418			return (FALSE);
419			}
420
421			static bool_t
422			svctcp_getargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
423			{
424
425			return ((xdr_args)(&(((struct tcp_conn )(xprt->xp_p1))->xdrs), args_ptr));
426			}
427
428			static bool_t
429			svctcp_freeargs(SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
430			{
431			XDR *xdrs =
432			&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
433
434			xdrs->x_op = XDR_FREE;
435			return ((*xdr_args)(xdrs, args_ptr));
436			}
437
438			static bool_t
439			svctcp_reply(SVCXPRT xprt, struct rpc_msg msg)
440			{
441			struct tcp_conn *cd =
442			(struct tcp_conn *)(xprt->xp_p1);
443			XDR *xdrs = &(cd->xdrs);
444			bool_t stat;
445
446			xdrs->x_op = XDR_ENCODE;
447			msg->rm_xid = cd->x_id;
448			stat = xdr_replymsg(xdrs, msg);
449			(void)xdrrec_endofrecord(xdrs, TRUE);
450			return (stat);
451			}