/* @(#)pmap_rmt.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[] = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";
#endif

/*
 * pmap_rmt.c
 * Client interface to pmap rpc service.
 * remote call and broadcast service
 */

#include "k5-platform.h"
#include <unistd.h>
#include <gssrpc/rpc.h>
#include <gssrpc/pmap_prot.h>
#include <gssrpc/pmap_clnt.h>
#include <gssrpc/pmap_rmt.h>
#include <sys/socket.h>
#ifdef sun
#include <sys/sockio.h>
#endif
#ifdef OSF1
#include <net/route.h>
#include <sys/mbuf.h>
#endif
#include <net/if.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#define MAX_BROADCAST_SIZE 1400
#include <port-sockets.h>
#include "socket-utils.h"

static struct timeval timeout = { 3, 0 };

#ifndef GETSOCKNAME_ARG3_TYPE
#define GETSOCKNAME_ARG3_TYPE int
#endif

/*
 * pmapper remote-call-service interface.
 * This routine is used to call the pmapper remote call service
 * which will look up a service program in the port maps, and then
 * remotely call that routine with the given parameters.  This allows
 * programs to do a lookup and call in one step.
*/
enum clnt_stat
pmap_rmtcall(
        struct sockaddr_in *addr,
        rpcprog_t prog,
        rpcvers_t vers,
        rpcproc_t proc,
        xdrproc_t xdrargs,
        caddr_t argsp,
        xdrproc_t xdrres,
        caddr_t resp,
        struct timeval tout,
        rpcport_t *port_ptr)
{
        SOCKET sock = INVALID_SOCKET;
        CLIENT *client;
        struct rmtcallargs a;
        struct rmtcallres r;
        enum clnt_stat stat;

        addr->sin_port = htons(PMAPPORT);
        client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock);
        if (client != (CLIENT *)NULL) {
                a.prog = prog;
                a.vers = vers;
                a.proc = proc;
                a.args_ptr = argsp;
                a.xdr_args = xdrargs;
                r.port_ptr = port_ptr;
                r.results_ptr = resp;
                r.xdr_results = xdrres;
                stat = CLNT_CALL(client, PMAPPROC_CALLIT,
                                 (xdrproc_t)xdr_rmtcall_args, &a,
                                 (xdrproc_t)xdr_rmtcallres, &r, tout);
                CLNT_DESTROY(client);
        } else {
                stat = RPC_FAILED;
        }
        (void)closesocket(sock);
        addr->sin_port = 0;
        return (stat);
}


/*
 * XDR remote call arguments
 * written for XDR_ENCODE direction only
 */
bool_t
xdr_rmtcall_args(
        XDR *xdrs,
        struct rmtcallargs *cap)
{
        u_int lenposition, argposition, position;

        if (xdr_u_int32(xdrs, &(cap->prog)) &&
            xdr_u_int32(xdrs, &(cap->vers)) &&
            xdr_u_int32(xdrs, &(cap->proc))) {
                lenposition = XDR_GETPOS(xdrs);
                if (! xdr_u_int32(xdrs, &(cap->arglen)))
                    return (FALSE);
                argposition = XDR_GETPOS(xdrs);
                if (! (*(cap->xdr_args))(xdrs, cap->args_ptr))
                    return (FALSE);
                position = XDR_GETPOS(xdrs);
                cap->arglen = (uint32_t)position - (uint32_t)argposition;
                XDR_SETPOS(xdrs, lenposition);
                if (! xdr_u_int32(xdrs, &(cap->arglen)))
                    return (FALSE);
                XDR_SETPOS(xdrs, position);
                return (TRUE);
        }
        return (FALSE);
}

/*
 * XDR remote call results
 * written for XDR_DECODE direction only
 */
bool_t
xdr_rmtcallres(
        XDR *xdrs,
        struct rmtcallres *crp)
{
        caddr_t port_ptr;

        port_ptr = (caddr_t)(void *)crp->port_ptr;
        if (!xdr_reference(xdrs, &port_ptr, sizeof (uint32_t),
                           (xdrproc_t)xdr_u_int32))
                return (FALSE);
        crp->port_ptr = (uint32_t *)(void *)port_ptr;
        if (xdr_u_int32(xdrs, &crp->resultslen))
                return ((*(crp->xdr_results))(xdrs, crp->results_ptr));
        return (FALSE);
}


/*
 * The following is kludged-up support for simple rpc broadcasts.
 * Someday a large, complicated system will replace these trivial
 * routines which only support udp/ip .
 */

#define GIFCONF_BUFSIZE (256 * sizeof (struct ifconf))

static int
getbroadcastnets(
        struct in_addr *addrs,
        int sock,  /* any valid socket will do */
        char *buf  /* why allocxate more when we can use existing... */
        )
{
        struct ifconf ifc;
        struct ifreq ifreq, *ifr;
        int n, i;

        ifc.ifc_len = GIFCONF_BUFSIZE;
        ifc.ifc_buf = buf;
        memset (buf, 0, GIFCONF_BUFSIZE);
        if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {
                perror("broadcast: ioctl (get interface configuration)");
                return (0);
        }
        ifr = ifc.ifc_req;
        for (i = 0, n = ifc.ifc_len/sizeof (struct ifreq); n > 0; n--, ifr++) {
                ifreq = *ifr;
                if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
                        perror("broadcast: ioctl (get interface flags)");
                        continue;
                }
                if ((ifreq.ifr_flags & IFF_BROADCAST) &&
                    (ifreq.ifr_flags & IFF_UP) &&
                    ifr->ifr_addr.sa_family == AF_INET) {
#ifdef SIOCGIFBRDADDR   /* 4.3BSD */
                        if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
                                addrs[i++].s_addr = INADDR_ANY;
                        } else {
                                addrs[i++] = sa2sin(&ifreq.ifr_addr)->sin_addr;
                        }
#else /* 4.2 BSD */
                        struct sockaddr_in *sockin;
                        sockin = sa2sin(&ifr->ifr_addr);
                        addrs[i++] = inet_makeaddr(inet_netof
                          (sockin->sin_addr.s_addr), INADDR_ANY);
#endif
                }
        }
        return (i);
}

enum clnt_stat
clnt_broadcast(
        rpcprog_t       prog,           /* program number */
        rpcvers_t       vers,           /* version number */
        rpcproc_t       proc,           /* procedure number */
        xdrproc_t       xargs,          /* xdr routine for args */
        caddr_t         argsp,          /* pointer to args */
        xdrproc_t       xresults,       /* xdr routine for results */
        caddr_t         resultsp,       /* pointer to results */
        resultproc_t    eachresult      /* call with each result obtained */
        )
{
        enum clnt_stat stat;
        AUTH *unix_auth = authunix_create_default();
        XDR xdr_stream;
        XDR *xdrs = &xdr_stream;
        int outlen, nets;
        ssize_t inlen;
        GETSOCKNAME_ARG3_TYPE fromlen;
        SOCKET sock;
        int on = 1;
#ifdef FD_SETSIZE
        fd_set mask;
        fd_set readfds;
#else
        int readfds;
        int mask;
#endif /* def FD_SETSIZE */
        int i;
        bool_t done = FALSE;
        uint32_t xid;
        rpcport_t port;
        struct in_addr addrs[20];
        struct sockaddr_in baddr, raddr; /* broadcast and response addresses */
        struct rmtcallargs a;
        struct rmtcallres r;
        struct rpc_msg msg;
        struct timeval t, t2;
        char outbuf[MAX_BROADCAST_SIZE];
#ifndef MAX
#define MAX(A,B) ((A)<(B)?(B):(A))
#endif
        char inbuf[MAX (UDPMSGSIZE, GIFCONF_BUFSIZE)];

        /*
         * initialization: create a socket, a broadcast address, and
         * preserialize the arguments into a send buffer.
         */
        if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
                perror("Cannot create socket for broadcast rpc");
                stat = RPC_CANTSEND;
                goto done_broad;
        }
        set_cloexec_fd(sock);
#ifdef SO_BROADCAST
        if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *) &on,
                       sizeof (on)) < 0) {
                perror("Cannot set socket option SO_BROADCAST");
                stat = RPC_CANTSEND;
                goto done_broad;
        }
#endif /* def SO_BROADCAST */
#ifdef FD_SETSIZE
        FD_ZERO(&mask);
        FD_SET(sock, &mask);
#else
        mask = (1 << sock);
#endif /* def FD_SETSIZE */
        nets = getbroadcastnets(addrs, sock, inbuf);
        memset(&baddr, 0, sizeof (baddr));
        baddr.sin_family = AF_INET;
        baddr.sin_port = htons(PMAPPORT);
        baddr.sin_addr.s_addr = htonl(INADDR_ANY);
/*      baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */
        (void)gettimeofday(&t, (struct timezone *)0);
        msg.rm_xid = xid = getpid() ^ t.tv_sec ^ t.tv_usec;
        t.tv_usec = 0;
        msg.rm_direction = CALL;
        msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
        msg.rm_call.cb_prog = PMAPPROG;
        msg.rm_call.cb_vers = PMAPVERS;
        msg.rm_call.cb_proc = PMAPPROC_CALLIT;
        msg.rm_call.cb_cred = unix_auth->ah_cred;
        msg.rm_call.cb_verf = unix_auth->ah_verf;
        a.prog = prog;
        a.vers = vers;
        a.proc = proc;
        a.xdr_args = xargs;
        a.args_ptr = argsp;
        r.port_ptr = &port;
        r.xdr_results = xresults;
        r.results_ptr = resultsp;
        xdrmem_create(xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE);
        if ((! xdr_callmsg(xdrs, &msg)) || (! xdr_rmtcall_args(xdrs, &a))) {
                stat = RPC_CANTENCODEARGS;
                goto done_broad;
        }
        outlen = (int)xdr_getpos(xdrs);
        xdr_destroy(xdrs);
        /*
         * Basic loop: broadcast a packet and wait a while for response(s).
         * The response timeout grows larger per iteration.
         */
        for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) {
                for (i = 0; i < nets; i++) {
                        baddr.sin_addr = addrs[i];
                        if (sendto(sock, outbuf, outlen, 0,
                                (struct sockaddr *)&baddr,
                                sizeof (struct sockaddr)) != outlen) {
                                perror("Cannot send broadcast packet");
                                stat = RPC_CANTSEND;
                                goto done_broad;
                        }
                }
                if (eachresult == NULL) {
                        stat = RPC_SUCCESS;
                        goto done_broad;
                }
        recv_again:
                msg.acpted_rply.ar_verf = gssrpc__null_auth;
                msg.acpted_rply.ar_results.where = (caddr_t)&r;
                msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_rmtcallres;
                readfds = mask;
                t2 = t;
                switch (select(gssrpc__rpc_dtablesize(), &readfds, (fd_set *)NULL,
                               (fd_set *)NULL, &t2)) {

                case 0:  /* timed out */
                        stat = RPC_TIMEDOUT;
                        continue;

                case -1:  /* some kind of error */
                        if (errno == EINTR)
                                goto recv_again;
                        perror("Broadcast select problem");
                        stat = RPC_CANTRECV;
                        goto done_broad;

                }  /* end of select results switch */
        try_again:
                fromlen = sizeof(struct sockaddr);
                inlen = recvfrom(sock, inbuf, UDPMSGSIZE, 0,
                        (struct sockaddr *)&raddr, &fromlen);
                if (inlen < 0) {
                        if (errno == EINTR)
                                goto try_again;
                        perror("Cannot receive reply to broadcast");
                        stat = RPC_CANTRECV;
                        goto done_broad;
                }
                if ((size_t)inlen < sizeof(uint32_t))
                        goto recv_again;
                /*
                 * see if reply transaction id matches sent id.
                 * If so, decode the results.
                 */
                xdrmem_create(xdrs, inbuf, (u_int)inlen, XDR_DECODE);
                if (xdr_replymsg(xdrs, &msg)) {
                        if ((msg.rm_xid == xid) &&
                                (msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
                                (msg.acpted_rply.ar_stat == SUCCESS)) {
                                raddr.sin_port = htons((u_short)port);
                                done = (*eachresult)(resultsp, &raddr);
                        }
                        /* otherwise, we just ignore the errors ... */
                } else {
#ifdef notdef
                        /* some kind of deserialization problem ... */
                        if (msg.rm_xid == xid)
                                fprintf(stderr, "Broadcast deserialization problem");
                        /* otherwise, just random garbage */
#endif
                }
                xdrs->x_op = XDR_FREE;
                msg.acpted_rply.ar_results.proc = xdr_void;
                (void)xdr_replymsg(xdrs, &msg);
                (void)(*xresults)(xdrs, resultsp);
                xdr_destroy(xdrs);
                if (done) {
                        stat = RPC_SUCCESS;
                        goto done_broad;
                } else {
                        goto recv_again;
                }
        }
done_broad:
        (void)closesocket(sock);
        AUTH_DESTROY(unix_auth);
        return (stat);
}