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/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if defined(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/

/*static char *sccsid = "from: @(#)svc_tcp.c    2.2 88/08/01 4.0 RPCSRC";*/

static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc_tcp.c,v 1.18 2000/01/27 23:06:41 jasone Exp $";

#endif

/*

 * svc_tcp.c, Server side for TCP/IP based RPC.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * 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 <unistd.h>

#include <string.h>

#include <rpc/rpc.h>

#include <sys/socket.h>

#include <sys/ioctl.h>

#include <errno.h>

/*

 * Ops vector for TCP/IP based rpc service handle

 */

static bool_t           svctcp_recv();

static enum xprt_stat   svctcp_stat();

static bool_t           svctcp_getargs();

static bool_t           svctcp_reply();

static bool_t           svctcp_freeargs();

static void             svctcp_destroy();

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();

static enum xprt_stat   rendezvous_stat();

static struct xp_ops svctcp_rendezvous_op = {

        rendezvous_request,

        rendezvous_stat,

        (bool_t (*)())abort,

        (bool_t (*)())abort,

        (bool_t (*)())abort,

        svctcp_destroy

};

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;

        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(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);

        int on;

        if (sock == RPC_ANYSOCK) {

                if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {

                        perror("svctcp_.c - udp socket creation problem");

                        return ((SVCXPRT *)NULL);

                }

                madesock = TRUE;

        }

        on = 1;

        if (ioctl(sock, FIONBIO, &on) < 0) {

                perror("svc_tcp.c - cannot turn on non-blocking mode");

                if (madesock)

                       (void)_close(sock);

                return ((SVCXPRT *)NULL);

        }

        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)) {

                perror("svctcp_.c - cannot getsockname or listen");

                if (madesock)

                       (void)_close(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_verf = _null_auth;

        xprt->xp_ops = &svctcp_rendezvous_op;

        xprt->xp_port = ntohs(addr.sin_port);

        xprt->xp_sock = sock;

        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 = (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_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;

        xprt_register(xprt);

    done:

        return (xprt);

}

static bool_t

rendezvous_request(xprt)

        register SVCXPRT *xprt;

{

        int sock;

        struct tcp_rendezvous *r;

        struct sockaddr_in addr;

        int len;

        int off;

        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);

        }

        /*

         * Guard against FTP bounce attacks.

         */

        if (addr.sin_port == htons(20)) {

                _close(sock);

                return (FALSE);

        }

        /*

         * The listening socket is in FIONBIO mode and we inherit it.

         */

        off = 0;

        if (ioctl(sock, FIONBIO, &off) < 0) {

                _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()

{

        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));

        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.)

 *

 * Note: we have to be careful here not to allow ourselves to become

 * blocked too long in this routine. While we're waiting for data from one

 * client, another client may be trying to connect. To avoid this situation,

 * some code from svc_run() is transplanted here: the select() loop checks

 * all RPC descriptors including the one we want and calls svc_getreqset2()

 * to handle new requests if any are detected.

 */

static int

readtcp(xprt, buf, len)

        register SVCXPRT *xprt;

        caddr_t buf;

        register int len;

{

        register int sock = xprt->xp_sock;

        struct timeval start, delta, tv;

        struct timeval tmp1, tmp2;

        fd_set *fds;

        delta = wait_per_try;

        fds = NULL;

        gettimeofday(&start, NULL);

        do {

                int bytes = sizeof (fd_set);

                if (fds != NULL)

                        free(fds);

                fds = (fd_set *)malloc(bytes);

                if (fds == NULL)

                        goto fatal_err;

                memcpy(fds, __svc_fdset, bytes);

                /* XXX we know the other bits are still clear */

                FD_SET(sock, fds);

                tv = delta;     /* in case select() implements writeback */

                switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) {

                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;

                        continue;

                case 0:

                        goto fatal_err;

                default:

                        if (!FD_ISSET(sock, fds)) {

                                svc_getreqset2(fds, svc_maxfd + 1);

                                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;

                                continue;

                        }

                }

        } while (!FD_ISSET(sock, fds));

        if ((len = _read(sock, buf, len)) > 0) {

                if (fds != NULL)

                        free(fds);

                return (len);

        }

fatal_err:

        ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;

        if (fds != NULL)

                free(fds);

        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);

        }

        cd->strm_stat = XPRT_DIED;      /* XXXX */

        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);

}