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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: @(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";*/

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

static char *rcsid = "$FreeBSD: src/lib/libc/rpc/pmap_rmt.c,v 1.15 2000/01/27 23:06:40 jasone Exp $";

#endif

/*

 * pmap_rmt.c

 * Client interface to pmap rpc service.

 * remote call and broadcast service

 *

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

 */

#include <rpc/rpc.h>

#include <rpc/pmap_prot.h>

#include <rpc/pmap_clnt.h>

#include <rpc/pmap_rmt.h>

#include <sys/socket.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <net/if.h>

#include <sys/ioctl.h>

#include <arpa/inet.h>

#define MAX_BROADCAST_SIZE 1400

static struct timeval timeout = { 3, 0 };

/*

 * 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(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr)

        struct sockaddr_in *addr;

        u_long prog, vers, proc;

        xdrproc_t xdrargs, xdrres;

        caddr_t argsp, resp;

        struct timeval tout;

        u_long *port_ptr;

{

        int socket = -1;

        register CLIENT *client;

        struct rmtcallargs a;

        struct rmtcallres r;

        enum clnt_stat stat;

        addr->sin_port = htons(PMAPPORT);

        client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &socket);

        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, xdr_rmtcall_args, &a,

                    xdr_rmtcallres, &r, tout);

                CLNT_DESTROY(client);

        } else {

                stat = RPC_FAILED;

        }

        if (socket != -1)

                (void)_close(socket);

        addr->sin_port = 0;

        return (stat);

}

/*

 * XDR remote call arguments

 * written for XDR_ENCODE direction only

 */

bool_t

xdr_rmtcall_args(xdrs, cap)

        register XDR *xdrs;

        register struct rmtcallargs *cap;

{

        u_int lenposition, argposition, position;

        if (xdr_u_long(xdrs, &(cap->prog)) &&

            xdr_u_long(xdrs, &(cap->vers)) &&

            xdr_u_long(xdrs, &(cap->proc))) {

                lenposition = XDR_GETPOS(xdrs);

                if (! xdr_u_long(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 = (u_long)position - (u_long)argposition;

                XDR_SETPOS(xdrs, lenposition);

                if (! xdr_u_long(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(xdrs, crp)

        register XDR *xdrs;

        register struct rmtcallres *crp;

{

        caddr_t port_ptr;

        port_ptr = (caddr_t)crp->port_ptr;

        if (xdr_reference(xdrs, &port_ptr, sizeof (u_long),

            xdr_u_long) && xdr_u_long(xdrs, &crp->resultslen)) {

                crp->port_ptr = (u_long *)port_ptr;

                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 .

 */

static int

getbroadcastnets(addrs, sock, buf)

        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;

        struct sockaddr_in *sin;

        struct  in_addr addr;

        char *cp, *cplim;

        int n, i = 0;

        ifc.ifc_len = UDPMSGSIZE;

        ifc.ifc_buf = buf;

        if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) {

                perror("broadcast: ioctl (get interface configuration)");

                return (0);

        }

#define max(a, b) (a > b ? a : b)

#define size(p) max((p).sa_len, sizeof(p))

        cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */

        for (cp = buf; cp < cplim;

                        cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {

                ifr = (struct ifreq *)cp;

                if (ifr->ifr_addr.sa_family != AF_INET)

                        continue;

                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)) {

                        sin = (struct sockaddr_in *)&ifr->ifr_addr;

#ifdef SIOCGIFBRDADDR   /* 4.3BSD */

                        if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {

                                addr =

                                    inet_makeaddr(inet_netof(sin->sin_addr),

                                    INADDR_ANY);

                        } else {

                                addr = ((struct sockaddr_in*)

                                  &ifreq.ifr_addr)->sin_addr;

                        }

#else /* 4.2 BSD */

                        addr = inet_makeaddr(inet_netof(sin->sin_addr),

                            INADDR_ANY);

#endif

                        for (n=i-1; n>=0; n--) {

                                if (addr.s_addr == addrs[n].s_addr)

                                        break;

                        }

                        if (n<0) {

                                addrs[i++] = addr;

                        }

                }

        }

        return (i);

}

typedef bool_t (*resultproc_t)();

enum clnt_stat

clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)

        u_long          prog;           /* program number */

        u_long          vers;           /* version number */

        u_long          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;

        register XDR *xdrs = &xdr_stream;

        int outlen, inlen, fromlen, nets;

        register int sock;

        int on = 1;

        fd_set *fds = 0, readfds; /* initialized to avoid warning */

        register int i;

        bool_t done = FALSE;

        register u_long xid;

        u_long 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, tv;

        char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];

        static u_int32_t disrupt;

        if (disrupt == 0)

                disrupt = (u_int32_t)(long)resultsp;

        /*

         * 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;

        }

#ifdef SO_BROADCAST

        if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {

                perror("Cannot set socket option SO_BROADCAST");

                stat = RPC_CANTSEND;

                goto done_broad;

        }

#endif /* def SO_BROADCAST */

        if (sock + 1 > FD_SETSIZE) {

                int bytes = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);

                fds = (fd_set *)malloc(bytes);

                if (fds == NULL) {

                        stat = RPC_CANTSEND;

                        goto done_broad;

                }

                memset(fds, 0, bytes);

        } else {

                fds = &readfds;

                FD_ZERO(fds);

        }

        nets = getbroadcastnets(addrs, sock, inbuf);

        memset(&baddr, 0, sizeof (baddr));

        baddr.sin_len = sizeof(struct sockaddr_in);

        baddr.sin_family = AF_INET;

        baddr.sin_port = htons(PMAPPORT);

        baddr.sin_addr.s_addr = htonl(INADDR_ANY);

        (void)gettimeofday(&t, (struct timezone *)0);

        msg.rm_xid = xid = (++disrupt) ^ 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.

         *

         * XXX This will loop about 5 times the stop. If there are

         * lots of signals being received by the process it will quit

         * send them all in one quick burst, not paying attention to

         * the intended function of sending them slowly over half a

         * minute or so

         */

        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 = _null_auth;

                msg.acpted_rply.ar_results.where = (caddr_t)&r;

                msg.acpted_rply.ar_results.proc = xdr_rmtcallres;

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

                FD_SET(sock, fds);

                tv = t;         /* for select() that copies back */

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

                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 (inlen < sizeof(u_int32_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 ... */

                }

                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:

        if (fds != &readfds)

                free(fds);

        if (sock >= 0)

                (void)_close(sock);

        AUTH_DESTROY(unix_auth);

        return (stat);

}