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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [librpc/] [src/] [rpc/] [clnt_udp.c] - Blame information for rev 1771

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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: @(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)clnt_udp.c   2.2 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$FreeBSD: src/lib/libc/rpc/clnt_udp.c,v 1.15 2000/01/27 23:06:36 jasone Exp $";
#endif
 
/*
 * clnt_udp.c, Implements a UDP/IP based, client side RPC.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */
 
#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 <netdb.h>
#include <errno.h>
#include <rpc/pmap_clnt.h>
 
/*
 * UDP bases client side rpc operations
 */
static enum clnt_stat   clntudp_call();
static void             clntudp_abort();
static void             clntudp_geterr();
static bool_t           clntudp_freeres();
static bool_t           clntudp_control();
static void             clntudp_destroy();
 
static struct clnt_ops udp_ops = {
        clntudp_call,
        clntudp_abort,
        clntudp_geterr,
        clntudp_freeres,
        clntudp_destroy,
        clntudp_control
};
 
/*
 * Private data kept per client handle
 */
struct cu_data {
        int                cu_sock;
        bool_t             cu_closeit;
        struct sockaddr_in cu_raddr;
        int                cu_rlen;
        struct timeval     cu_wait;
        struct timeval     cu_total;
        struct rpc_err     cu_error;
        XDR                cu_outxdrs;
        u_int              cu_xdrpos;
        u_int              cu_sendsz;
        char               *cu_outbuf;
        u_int              cu_recvsz;
        char               cu_inbuf[1];
};
 
/*
 * Create a UDP based client handle.
 * If *sockp<0, *sockp is set to a newly created UPD socket.
 * If raddr->sin_port is 0 a binder on the remote machine
 * is consulted for the correct port number.
 * NB: It is the clients responsibility to close *sockp.
 * NB: The rpch->cl_auth is initialized to null authentication.
 *     Caller may wish to set this something more useful.
 *
 * wait is the amount of time used between retransmitting a call if
 * no response has been heard;  retransmition occurs until the actual
 * rpc call times out.
 *
 * sendsz and recvsz are the maximum allowable packet sizes that can be
 * sent and received.
 */
CLIENT *
clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz)
        struct sockaddr_in *raddr;
        u_long program;
        u_long version;
        struct timeval wait;
        register int *sockp;
        u_int sendsz;
        u_int recvsz;
{
        CLIENT *cl;
        register struct cu_data *cu = NULL;
        struct timeval now;
        struct rpc_msg call_msg;
        static u_int32_t disrupt;
 
        if (disrupt == 0)
                disrupt = (u_int32_t)(long)raddr;
 
        cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
        if (cl == NULL) {
                (void) fprintf(stderr, "clntudp_create: out of memory\n");
                rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                rpc_createerr.cf_error.re_errno = errno;
                goto fooy;
        }
        sendsz = ((sendsz + 3) / 4) * 4;
        recvsz = ((recvsz + 3) / 4) * 4;
        cu = (struct cu_data *)mem_alloc(sizeof(*cu) + sendsz + recvsz);
        if (cu == NULL) {
                (void) fprintf(stderr, "clntudp_create: out of memory\n");
                rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                rpc_createerr.cf_error.re_errno = errno;
                goto fooy;
        }
        cu->cu_outbuf = &cu->cu_inbuf[recvsz];
 
        (void)gettimeofday(&now, (struct timezone *)0);
        if (raddr->sin_port == 0) {
                u_short port;
                if ((port =
                    pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {
                        goto fooy;
                }
                raddr->sin_port = htons(port);
        }
        cl->cl_ops = &udp_ops;
        cl->cl_private = (caddr_t)cu;
        cu->cu_raddr = *raddr;
        cu->cu_rlen = sizeof (cu->cu_raddr);
        cu->cu_wait = wait;
        cu->cu_total.tv_sec = -1;
        cu->cu_total.tv_usec = -1;
        cu->cu_sendsz = sendsz;
        cu->cu_recvsz = recvsz;
        call_msg.rm_xid = (++disrupt) ^ getpid() ^ now.tv_sec ^ now.tv_usec;
        call_msg.rm_direction = CALL;
        call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
        call_msg.rm_call.cb_prog = program;
        call_msg.rm_call.cb_vers = version;
        xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf,
            sendsz, XDR_ENCODE);
        if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {
                goto fooy;
        }
        cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
        if (*sockp < 0) {
                int dontblock = 1;
 
                *sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
                if (*sockp < 0) {
                        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                        rpc_createerr.cf_error.re_errno = errno;
                        goto fooy;
                }
                /* attempt to bind to priv port */
                (void)bindresvport(*sockp, (struct sockaddr_in *)0);
                /* the sockets rpc controls are non-blocking */
                (void)ioctl(*sockp, FIONBIO, (char *) &dontblock);
                cu->cu_closeit = TRUE;
        } else {
                cu->cu_closeit = FALSE;
        }
        cu->cu_sock = *sockp;
        cl->cl_auth = authnone_create();
        return (cl);
fooy:
        if (cu)
                mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz);
        if (cl)
                mem_free((caddr_t)cl, sizeof(CLIENT));
        return ((CLIENT *)NULL);
}
 
CLIENT *
clntudp_create(raddr, program, version, wait, sockp)
        struct sockaddr_in *raddr;
        u_long program;
        u_long version;
        struct timeval wait;
        register int *sockp;
{
 
        return(clntudp_bufcreate(raddr, program, version, wait, sockp,
            UDPMSGSIZE, UDPMSGSIZE));
}
 
static enum clnt_stat
clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)
        register CLIENT *cl;            /* client handle */
        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 */
        struct timeval  utimeout;       /* seconds to wait before giving up */
{
        register struct cu_data *cu = (struct cu_data *)cl->cl_private;
        register XDR *xdrs;
        register int outlen;
        register int inlen;
        int fromlen;
        fd_set *fds, readfds;
        struct sockaddr_in from;
        struct rpc_msg reply_msg;
        XDR reply_xdrs;
        struct timeval time_waited, start, after, tmp1, tmp2, tv;
        bool_t ok;
        int nrefreshes = 2;     /* number of times to refresh cred */
        struct timeval timeout;
 
        if (cu->cu_total.tv_usec == -1)
                timeout = utimeout;     /* use supplied timeout */
        else
                timeout = cu->cu_total; /* use default timeout */
 
        if (cu->cu_sock + 1 > FD_SETSIZE) {
                int bytes = howmany(cu->cu_sock + 1, NFDBITS) * sizeof(fd_mask);
                fds = (fd_set *)malloc(bytes);
                if (fds == NULL)
                        return (cu->cu_error.re_status = RPC_CANTSEND);
                memset(fds, 0, bytes);
        } else {
                fds = &readfds;
                FD_ZERO(fds);
        }
 
        timerclear(&time_waited);
 
call_again:
        xdrs = &(cu->cu_outxdrs);
        xdrs->x_op = XDR_ENCODE;
        XDR_SETPOS(xdrs, cu->cu_xdrpos);
        /*
         * the transaction is the first thing in the out buffer
         */
        (*(u_short *)(cu->cu_outbuf))++;
        if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
            (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
            (! (*xargs)(xdrs, argsp))) {
                if (fds != &readfds)
                        free(fds);
                return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
        }
        outlen = (int)XDR_GETPOS(xdrs);
 
send_again:
        if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
            (struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen) {
                cu->cu_error.re_errno = errno;
                if (fds != &readfds)
                        free(fds);
                return (cu->cu_error.re_status = RPC_CANTSEND);
        }
 
        /*
         * Hack to provide rpc-based message passing
         */
        if (!timerisset(&timeout)) {
                if (fds != &readfds)
                        free(fds);
                return (cu->cu_error.re_status = RPC_TIMEDOUT);
        }
        /*
         * sub-optimal code appears here because we have
         * some clock time to spare while the packets are in flight.
         * (We assume that this is actually only executed once.)
         */
        reply_msg.acpted_rply.ar_verf = _null_auth;
        reply_msg.acpted_rply.ar_results.where = resultsp;
        reply_msg.acpted_rply.ar_results.proc = xresults;
 
        gettimeofday(&start, NULL);
        for (;;) {
                /* XXX we know the other bits are still clear */
                FD_SET(cu->cu_sock, fds);
                tv = cu->cu_wait;
                switch (select(cu->cu_sock+1, fds, NULL, NULL, &tv)) {
 
                case 0:
                        timeradd(&time_waited, &cu->cu_wait, &tmp1);
                        time_waited = tmp1;
                        if (timercmp(&time_waited, &timeout, <))
                                goto send_again;
                        if (fds != &readfds)
                                free(fds);
                        return (cu->cu_error.re_status = RPC_TIMEDOUT);
 
                case -1:
                        if (errno == EINTR) {
                                gettimeofday(&after, NULL);
                                timersub(&after, &start, &tmp1);
                                timeradd(&time_waited, &tmp1, &tmp2);
                                time_waited = tmp2;
                                if (timercmp(&time_waited, &timeout, <))
                                        continue;
                                if (fds != &readfds)
                                        free(fds);
                                return (cu->cu_error.re_status = RPC_TIMEDOUT);
                        }
                        cu->cu_error.re_errno = errno;
                        if (fds != &readfds)
                                free(fds);
                        return (cu->cu_error.re_status = RPC_CANTRECV);
                }
 
                do {
                        fromlen = sizeof(struct sockaddr);
                        inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,
                                (int) cu->cu_recvsz, 0,
                                (struct sockaddr *)&from, &fromlen);
                } while (inlen < 0 && errno == EINTR);
                if (inlen < 0) {
                        if (errno == EWOULDBLOCK)
                                continue;
                        cu->cu_error.re_errno = errno;
                        if (fds != &readfds)
                                free(fds);
                        return (cu->cu_error.re_status = RPC_CANTRECV);
                }
                if (inlen < sizeof(u_int32_t))
                        continue;
                /* see if reply transaction id matches sent id */
                if (*((u_int32_t *)(cu->cu_inbuf)) != *((u_int32_t *)(cu->cu_outbuf)))
                        continue;
                /* we now assume we have the proper reply */
                break;
        }
 
        /*
         * now decode and validate the response
         */
        xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
        ok = xdr_replymsg(&reply_xdrs, &reply_msg);
        /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
        if (ok) {
                _seterr_reply(&reply_msg, &(cu->cu_error));
                if (cu->cu_error.re_status == RPC_SUCCESS) {
                        if (! AUTH_VALIDATE(cl->cl_auth,
                                &reply_msg.acpted_rply.ar_verf)) {
                                cu->cu_error.re_status = RPC_AUTHERROR;
                                cu->cu_error.re_why = AUTH_INVALIDRESP;
                        }
                        if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
                                xdrs->x_op = XDR_FREE;
                                (void)xdr_opaque_auth(xdrs,
                                    &(reply_msg.acpted_rply.ar_verf));
                        }
                }  /* end successful completion */
                else {
                        /* maybe our credentials need to be refreshed ... */
                        if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {
                                nrefreshes--;
                                goto call_again;
                        }
                }  /* end of unsuccessful completion */
        }  /* end of valid reply message */
        else {
                /*
                 * It's possible for xdr_replymsg() to fail partway
                 * through its attempt to decode the result from the
                 * server. If this happens, it will leave the reply
                 * structure partially populated with dynamically
                 * allocated memory. (This can happen if someone uses
                 * clntudp_bufcreate() to create a CLIENT handle and
                 * specifies a receive buffer size that is too small.)
                 * This memory must be free()ed to avoid a leak.
                 */
                int op = reply_xdrs.x_op;
                reply_xdrs.x_op = XDR_FREE;
                xdr_replymsg(&reply_xdrs, &reply_msg);
                reply_xdrs.x_op = op;
                cu->cu_error.re_status = RPC_CANTDECODERES;
        }
        if (fds != &readfds)
                free(fds);
        return (cu->cu_error.re_status);
}
 
static void
clntudp_geterr(cl, errp)
        CLIENT *cl;
        struct rpc_err *errp;
{
        register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 
        *errp = cu->cu_error;
}
 
 
static bool_t
clntudp_freeres(cl, xdr_res, res_ptr)
        CLIENT *cl;
        xdrproc_t xdr_res;
        caddr_t res_ptr;
{
        register struct cu_data *cu = (struct cu_data *)cl->cl_private;
        register XDR *xdrs = &(cu->cu_outxdrs);
 
        xdrs->x_op = XDR_FREE;
        return ((*xdr_res)(xdrs, res_ptr));
}
 
static void
clntudp_abort(/*h*/)
        /*CLIENT *h;*/
{
}
 
 
static bool_t
clntudp_control(cl, request, info)
        CLIENT *cl;
        int request;
        char *info;
{
        register struct cu_data *cu = (struct cu_data *)cl->cl_private;
        register struct timeval *tv;
        int len;
 
        switch (request) {
        case CLSET_FD_CLOSE:
                cu->cu_closeit = TRUE;
                break;
        case CLSET_FD_NCLOSE:
                cu->cu_closeit = FALSE;
                break;
        case CLSET_TIMEOUT:
                if (info == NULL)
                        return(FALSE);
                tv = (struct timeval *)info;
                cu->cu_total.tv_sec = tv->tv_sec;
                cu->cu_total.tv_usec = tv->tv_usec;
                break;
        case CLGET_TIMEOUT:
                if (info == NULL)
                        return(FALSE);
                *(struct timeval *)info = cu->cu_total;
                break;
        case CLSET_RETRY_TIMEOUT:
                if (info == NULL)
                        return(FALSE);
                tv = (struct timeval *)info;
                cu->cu_wait.tv_sec = tv->tv_sec;
                cu->cu_wait.tv_usec = tv->tv_usec;
                break;
        case CLGET_RETRY_TIMEOUT:
                if (info == NULL)
                        return(FALSE);
                *(struct timeval *)info = cu->cu_wait;
                break;
        case CLGET_SERVER_ADDR:
                if (info == NULL)
                        return(FALSE);
                *(struct sockaddr_in *)info = cu->cu_raddr;
                break;
        case CLGET_FD:
                if (info == NULL)
                        return(FALSE);
                *(int *)info = cu->cu_sock;
                break;
        case CLGET_XID:
                /*
                 * use the knowledge that xid is the
                 * first element in the call structure *.
                 * This will get the xid of the PREVIOUS call
                 */
                if (info == NULL)
                        return(FALSE);
                *(u_long *)info = ntohl(*(u_long *)cu->cu_outbuf);
                break;
        case CLSET_XID:
                /* This will set the xid of the NEXT call */
                if (info == NULL)
                        return(FALSE);
                *(u_long *)cu->cu_outbuf =  htonl(*(u_long *)info - 1);
                /* decrement by 1 as clntudp_call() increments once */
        case CLGET_VERS:
                /*
                 * This RELIES on the information that, in the call body,
                 * the version number field is the fifth field from the
                 * begining of the RPC header. MUST be changed if the
                 * call_struct is changed
                 */
                if (info == NULL)
                        return(FALSE);
                *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
                                                4 * BYTES_PER_XDR_UNIT));
                break;
        case CLSET_VERS:
                if (info == NULL)
                        return(FALSE);
                *(u_long *)(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)
                                = htonl(*(u_long *)info);
                break;
        case CLGET_PROG:
                /*
                 * This RELIES on the information that, in the call body,
                 * the program number field is the  field from the
                 * begining of the RPC header. MUST be changed if the
                 * call_struct is changed
                 */
                if (info == NULL)
                        return(FALSE);
                *(u_long *)info = ntohl(*(u_long *)(cu->cu_outbuf +
                                                3 * BYTES_PER_XDR_UNIT));
                break;
        case CLSET_PROG:
                if (info == NULL)
                        return(FALSE);
                *(u_long *)(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)
                                = htonl(*(u_long *)info);
                break;
        case CLGET_LOCAL_ADDR:
                len = sizeof(struct sockaddr);
                if (getsockname(cu->cu_sock, (struct sockaddr *)info, &len) <0)
                        return(FALSE);
                break;
        case CLGET_SVC_ADDR:
        case CLSET_SVC_ADDR:
        case CLSET_PUSH_TIMOD:
        case CLSET_POP_TIMOD:
        default:
                return (FALSE);
        }
        return (TRUE);
}
 
static void
clntudp_destroy(cl)
        CLIENT *cl;
{
        register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 
        if (cu->cu_closeit) {
                (void)_close(cu->cu_sock);
        }
        XDR_DESTROY(&(cu->cu_outxdrs));
        mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz));
        mem_free((caddr_t)cl, sizeof(CLIENT));
}

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[/] [or1k/] [trunk/] [rtems/] [c/] [src/] [librpc/] [src/] [rpc/] [clnt_udp.c] - Blame information for rev 1771

Line No.	Rev	Author	Line
1	158	chris	`/*`
2			`* Sun RPC is a product of Sun Microsystems, Inc. and is provided for`
3			`* unrestricted use provided that this legend is included on all tape`
4			`* media and as a part of the software program in whole or part. Users`
5			`* may copy or modify Sun RPC without charge, but are not authorized`
6			`* to license or distribute it to anyone else except as part of a product or`
7			`* program developed by the user.`
8			`*`
9			`* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE`
10			`* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR`
11			`* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.`
12			`*`
13			`* Sun RPC is provided with no support and without any obligation on the`
14			`* part of Sun Microsystems, Inc. to assist in its use, correction,`
15			`* modification or enhancement.`
16			`*`
17			`* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE`
18			`* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC`
19			`* OR ANY PART THEREOF.`
20			`*`
21			`* In no event will Sun Microsystems, Inc. be liable for any lost revenue`
22			`* or profits or other special, indirect and consequential damages, even if`
23			`* Sun has been advised of the possibility of such damages.`
24			`*`
25			`* Sun Microsystems, Inc.`
26			`* 2550 Garcia Avenue`
27			`* Mountain View, California 94043`
28			`*/`
29
30			`#if defined(LIBC_SCCS) && !defined(lint)`
31			`/static char sccsid = "from: @(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";*/`
32			`/static char sccsid = "from: @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC";*/`
33			`static char *rcsid = "$FreeBSD: src/lib/libc/rpc/clnt_udp.c,v 1.15 2000/01/27 23:06:36 jasone Exp $";`
34			`#endif`
35
36			`/*`
37			`* clnt_udp.c, Implements a UDP/IP based, client side RPC.`
38			`*`
39			`* Copyright (C) 1984, Sun Microsystems, Inc.`
40			`*/`
41
42			`#include <stdio.h>`
43			`#include <stdlib.h>`
44			`#include <unistd.h>`
45			`#include <string.h>`
46			`#include <rpc/rpc.h>`
47			`#include <sys/socket.h>`
48			`#include <sys/ioctl.h>`
49			`#include <netdb.h>`
50			`#include <errno.h>`
51			`#include <rpc/pmap_clnt.h>`
52
53			`/*`
54			`* UDP bases client side rpc operations`
55			`*/`
56			`static enum clnt_stat clntudp_call();`
57			`static void clntudp_abort();`
58			`static void clntudp_geterr();`
59			`static bool_t clntudp_freeres();`
60			`static bool_t clntudp_control();`
61			`static void clntudp_destroy();`
62
63			`static struct clnt_ops udp_ops = {`
64			`clntudp_call,`
65			`clntudp_abort,`
66			`clntudp_geterr,`
67			`clntudp_freeres,`
68			`clntudp_destroy,`
69			`clntudp_control`
70			`};`
71
72			`/*`
73			`* Private data kept per client handle`
74			`*/`
75			`struct cu_data {`
76			`int cu_sock;`
77			`bool_t cu_closeit;`
78			`struct sockaddr_in cu_raddr;`
79			`int cu_rlen;`
80			`struct timeval cu_wait;`
81			`struct timeval cu_total;`
82			`struct rpc_err cu_error;`
83			`XDR cu_outxdrs;`
84			`u_int cu_xdrpos;`
85			`u_int cu_sendsz;`
86			`char *cu_outbuf;`
87			`u_int cu_recvsz;`
88			`char cu_inbuf[1];`
89			`};`
90
91			`/*`
92			`* Create a UDP based client handle.`
93			`* If sockp<0, sockp is set to a newly created UPD socket.`
94			`* If raddr->sin_port is 0 a binder on the remote machine`
95			`* is consulted for the correct port number.`
96			`* NB: It is the clients responsibility to close *sockp.`
97			`* NB: The rpch->cl_auth is initialized to null authentication.`
98			`* Caller may wish to set this something more useful.`
99			`*`
100			`* wait is the amount of time used between retransmitting a call if`
101			`* no response has been heard; retransmition occurs until the actual`
102			`* rpc call times out.`
103			`*`
104			`* sendsz and recvsz are the maximum allowable packet sizes that can be`
105			`* sent and received.`
106			`*/`
107			`CLIENT *`
108			`clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz)`
109			`struct sockaddr_in *raddr;`
110			`u_long program;`
111			`u_long version;`
112			`struct timeval wait;`
113			`register int *sockp;`
114			`u_int sendsz;`
115			`u_int recvsz;`
116			`{`
117			`CLIENT *cl;`
118			`register struct cu_data *cu = NULL;`
119			`struct timeval now;`
120			`struct rpc_msg call_msg;`
121			`static u_int32_t disrupt;`
122
123			`if (disrupt == 0)`
124			`disrupt = (u_int32_t)(long)raddr;`
125
126			`cl = (CLIENT *)mem_alloc(sizeof(CLIENT));`
127			`if (cl == NULL) {`
128			`(void) fprintf(stderr, "clntudp_create: out of memory\n");`
129			`rpc_createerr.cf_stat = RPC_SYSTEMERROR;`
130			`rpc_createerr.cf_error.re_errno = errno;`
131			`goto fooy;`
132			`}`
133			`sendsz = ((sendsz + 3) / 4) * 4;`
134			`recvsz = ((recvsz + 3) / 4) * 4;`
135			`cu = (struct cu_data )mem_alloc(sizeof(cu) + sendsz + recvsz);`
136			`if (cu == NULL) {`
137			`(void) fprintf(stderr, "clntudp_create: out of memory\n");`
138			`rpc_createerr.cf_stat = RPC_SYSTEMERROR;`
139			`rpc_createerr.cf_error.re_errno = errno;`
140			`goto fooy;`
141			`}`
142			`cu->cu_outbuf = &cu->cu_inbuf[recvsz];`
143
144			`(void)gettimeofday(&now, (struct timezone *)0);`
145			`if (raddr->sin_port == 0) {`
146			`u_short port;`
147			`if ((port =`
148			`pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {`
149			`goto fooy;`
150			`}`
151			`raddr->sin_port = htons(port);`
152			`}`
153			`cl->cl_ops = &udp_ops;`
154			`cl->cl_private = (caddr_t)cu;`
155			`cu->cu_raddr = *raddr;`
156			`cu->cu_rlen = sizeof (cu->cu_raddr);`
157			`cu->cu_wait = wait;`
158			`cu->cu_total.tv_sec = -1;`
159			`cu->cu_total.tv_usec = -1;`
160			`cu->cu_sendsz = sendsz;`
161			`cu->cu_recvsz = recvsz;`
162			`call_msg.rm_xid = (++disrupt) ^ getpid() ^ now.tv_sec ^ now.tv_usec;`
163			`call_msg.rm_direction = CALL;`
164			`call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;`
165			`call_msg.rm_call.cb_prog = program;`
166			`call_msg.rm_call.cb_vers = version;`
167			`xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf,`
168			`sendsz, XDR_ENCODE);`
169			`if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {`
170			`goto fooy;`
171			`}`
172			`cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));`
173			`if (*sockp < 0) {`
174			`int dontblock = 1;`
175
176			`*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);`
177			`if (*sockp < 0) {`
178			`rpc_createerr.cf_stat = RPC_SYSTEMERROR;`
179			`rpc_createerr.cf_error.re_errno = errno;`
180			`goto fooy;`
181			`}`
182			`/* attempt to bind to priv port */`
183			`(void)bindresvport(sockp, (struct sockaddr_in )0);`
184			`/* the sockets rpc controls are non-blocking */`
185			`(void)ioctl(sockp, FIONBIO, (char ) &dontblock);`
186			`cu->cu_closeit = TRUE;`
187			`} else {`
188			`cu->cu_closeit = FALSE;`
189			`}`
190			`cu->cu_sock = *sockp;`
191			`cl->cl_auth = authnone_create();`
192			`return (cl);`
193			`fooy:`
194			`if (cu)`
195			`mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz);`
196			`if (cl)`
197			`mem_free((caddr_t)cl, sizeof(CLIENT));`
198			`return ((CLIENT *)NULL);`
199			`}`
200
201			`CLIENT *`
202			`clntudp_create(raddr, program, version, wait, sockp)`
203			`struct sockaddr_in *raddr;`
204			`u_long program;`
205			`u_long version;`
206			`struct timeval wait;`
207			`register int *sockp;`
208			`{`
209
210			`return(clntudp_bufcreate(raddr, program, version, wait, sockp,`
211			`UDPMSGSIZE, UDPMSGSIZE));`
212			`}`
213
214			`static enum clnt_stat`
215			`clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, utimeout)`
216			`register CLIENT cl; / client handle */`
217			`u_long proc; /* procedure number */`
218			`xdrproc_t xargs; /* xdr routine for args */`
219			`caddr_t argsp; /* pointer to args */`
220			`xdrproc_t xresults; /* xdr routine for results */`
221			`caddr_t resultsp; /* pointer to results */`
222			`struct timeval utimeout; /* seconds to wait before giving up */`
223			`{`
224			`register struct cu_data cu = (struct cu_data )cl->cl_private;`
225			`register XDR *xdrs;`
226			`register int outlen;`
227			`register int inlen;`
228			`int fromlen;`
229			`fd_set *fds, readfds;`
230			`struct sockaddr_in from;`
231			`struct rpc_msg reply_msg;`
232			`XDR reply_xdrs;`
233			`struct timeval time_waited, start, after, tmp1, tmp2, tv;`
234			`bool_t ok;`
235			`int nrefreshes = 2; /* number of times to refresh cred */`
236			`struct timeval timeout;`
237
238			`if (cu->cu_total.tv_usec == -1)`
239			`timeout = utimeout; /* use supplied timeout */`
240			`else`
241			`timeout = cu->cu_total; /* use default timeout */`
242
243			`if (cu->cu_sock + 1 > FD_SETSIZE) {`
244			`int bytes = howmany(cu->cu_sock + 1, NFDBITS) * sizeof(fd_mask);`
245			`fds = (fd_set *)malloc(bytes);`
246			`if (fds == NULL)`
247			`return (cu->cu_error.re_status = RPC_CANTSEND);`
248			`memset(fds, 0, bytes);`
249			`} else {`
250			`fds = &readfds;`
251			`FD_ZERO(fds);`
252			`}`
253
254			`timerclear(&time_waited);`
255
256			`call_again:`
257			`xdrs = &(cu->cu_outxdrs);`
258			`xdrs->x_op = XDR_ENCODE;`
259			`XDR_SETPOS(xdrs, cu->cu_xdrpos);`
260			`/*`
261			`* the transaction is the first thing in the out buffer`
262			`*/`
263			`((u_short )(cu->cu_outbuf))++;`
264			`if ((! XDR_PUTLONG(xdrs, (long *)&proc)) \|\|`
265			`(! AUTH_MARSHALL(cl->cl_auth, xdrs)) \|\|`
266			`(! (*xargs)(xdrs, argsp))) {`
267			`if (fds != &readfds)`
268			`free(fds);`
269			`return (cu->cu_error.re_status = RPC_CANTENCODEARGS);`
270			`}`
271			`outlen = (int)XDR_GETPOS(xdrs);`
272
273			`send_again:`
274			`if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,`
275			`(struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen) {`
276			`cu->cu_error.re_errno = errno;`
277			`if (fds != &readfds)`
278			`free(fds);`
279			`return (cu->cu_error.re_status = RPC_CANTSEND);`
280			`}`
281
282			`/*`
283			`* Hack to provide rpc-based message passing`
284			`*/`
285			`if (!timerisset(&timeout)) {`
286			`if (fds != &readfds)`
287			`free(fds);`
288			`return (cu->cu_error.re_status = RPC_TIMEDOUT);`
289			`}`
290			`/*`
291			`* sub-optimal code appears here because we have`
292			`* some clock time to spare while the packets are in flight.`
293			`* (We assume that this is actually only executed once.)`
294			`*/`
295			`reply_msg.acpted_rply.ar_verf = _null_auth;`
296			`reply_msg.acpted_rply.ar_results.where = resultsp;`
297			`reply_msg.acpted_rply.ar_results.proc = xresults;`
298
299			`gettimeofday(&start, NULL);`
300			`for (;;) {`
301			`/* XXX we know the other bits are still clear */`
302			`FD_SET(cu->cu_sock, fds);`
303			`tv = cu->cu_wait;`
304			`switch (select(cu->cu_sock+1, fds, NULL, NULL, &tv)) {`
305
306			`case 0:`
307			`timeradd(&time_waited, &cu->cu_wait, &tmp1);`
308			`time_waited = tmp1;`
309			`if (timercmp(&time_waited, &timeout, <))`
310			`goto send_again;`
311			`if (fds != &readfds)`
312			`free(fds);`
313			`return (cu->cu_error.re_status = RPC_TIMEDOUT);`
314
315			`case -1:`
316			`if (errno == EINTR) {`
317			`gettimeofday(&after, NULL);`
318			`timersub(&after, &start, &tmp1);`
319			`timeradd(&time_waited, &tmp1, &tmp2);`
320			`time_waited = tmp2;`
321			`if (timercmp(&time_waited, &timeout, <))`
322			`continue;`
323			`if (fds != &readfds)`
324			`free(fds);`
325			`return (cu->cu_error.re_status = RPC_TIMEDOUT);`
326			`}`
327			`cu->cu_error.re_errno = errno;`
328			`if (fds != &readfds)`
329			`free(fds);`
330			`return (cu->cu_error.re_status = RPC_CANTRECV);`
331			`}`
332
333			`do {`
334			`fromlen = sizeof(struct sockaddr);`
335			`inlen = recvfrom(cu->cu_sock, cu->cu_inbuf,`
336			`(int) cu->cu_recvsz, 0,`
337			`(struct sockaddr *)&from, &fromlen);`
338			`} while (inlen < 0 && errno == EINTR);`
339			`if (inlen < 0) {`
340			`if (errno == EWOULDBLOCK)`
341			`continue;`
342			`cu->cu_error.re_errno = errno;`
343			`if (fds != &readfds)`
344			`free(fds);`
345			`return (cu->cu_error.re_status = RPC_CANTRECV);`
346			`}`
347			`if (inlen < sizeof(u_int32_t))`
348			`continue;`
349			`/* see if reply transaction id matches sent id */`
350			`if (((u_int32_t )(cu->cu_inbuf)) != ((u_int32_t )(cu->cu_outbuf)))`
351			`continue;`
352			`/* we now assume we have the proper reply */`
353			`break;`
354			`}`
355
356			`/*`
357			`* now decode and validate the response`
358			`*/`
359			`xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);`
360			`ok = xdr_replymsg(&reply_xdrs, &reply_msg);`
361			`/* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */`
362			`if (ok) {`
363			`_seterr_reply(&reply_msg, &(cu->cu_error));`
364			`if (cu->cu_error.re_status == RPC_SUCCESS) {`
365			`if (! AUTH_VALIDATE(cl->cl_auth,`
366			`&reply_msg.acpted_rply.ar_verf)) {`
367			`cu->cu_error.re_status = RPC_AUTHERROR;`
368			`cu->cu_error.re_why = AUTH_INVALIDRESP;`
369			`}`
370			`if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {`
371			`xdrs->x_op = XDR_FREE;`
372			`(void)xdr_opaque_auth(xdrs,`
373			`&(reply_msg.acpted_rply.ar_verf));`
374			`}`
375			`} /* end successful completion */`
376			`else {`
377			`/* maybe our credentials need to be refreshed ... */`
378			`if (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) {`
379			`nrefreshes--;`
380			`goto call_again;`
381			`}`
382			`} /* end of unsuccessful completion */`
383			`} /* end of valid reply message */`
384			`else {`
385			`/*`
386			`* It's possible for xdr_replymsg() to fail partway`
387			`* through its attempt to decode the result from the`
388			`* server. If this happens, it will leave the reply`
389			`* structure partially populated with dynamically`
390			`* allocated memory. (This can happen if someone uses`
391			`* clntudp_bufcreate() to create a CLIENT handle and`
392			`* specifies a receive buffer size that is too small.)`
393			`* This memory must be free()ed to avoid a leak.`
394			`*/`
395			`int op = reply_xdrs.x_op;`
396			`reply_xdrs.x_op = XDR_FREE;`
397			`xdr_replymsg(&reply_xdrs, &reply_msg);`
398			`reply_xdrs.x_op = op;`
399			`cu->cu_error.re_status = RPC_CANTDECODERES;`
400			`}`
401			`if (fds != &readfds)`
402			`free(fds);`
403			`return (cu->cu_error.re_status);`
404			`}`
405
406			`static void`
407			`clntudp_geterr(cl, errp)`
408			`CLIENT *cl;`
409			`struct rpc_err *errp;`
410			`{`
411			`register struct cu_data cu = (struct cu_data )cl->cl_private;`
412
413			`*errp = cu->cu_error;`
414			`}`
415
416
417			`static bool_t`
418			`clntudp_freeres(cl, xdr_res, res_ptr)`
419			`CLIENT *cl;`
420			`xdrproc_t xdr_res;`
421			`caddr_t res_ptr;`
422			`{`
423			`register struct cu_data cu = (struct cu_data )cl->cl_private;`
424			`register XDR *xdrs = &(cu->cu_outxdrs);`
425
426			`xdrs->x_op = XDR_FREE;`
427			`return ((*xdr_res)(xdrs, res_ptr));`
428			`}`
429
430			`static void`
431			`clntudp_abort(/h/)`
432			`/CLIENT h;*/`
433			`{`
434			`}`
435
436
437			`static bool_t`
438			`clntudp_control(cl, request, info)`
439			`CLIENT *cl;`
440			`int request;`
441			`char *info;`
442			`{`
443			`register struct cu_data cu = (struct cu_data )cl->cl_private;`
444			`register struct timeval *tv;`
445			`int len;`
446
447			`switch (request) {`
448			`case CLSET_FD_CLOSE:`
449			`cu->cu_closeit = TRUE;`
450			`break;`
451			`case CLSET_FD_NCLOSE:`
452			`cu->cu_closeit = FALSE;`
453			`break;`
454			`case CLSET_TIMEOUT:`
455			`if (info == NULL)`
456			`return(FALSE);`
457			`tv = (struct timeval *)info;`
458			`cu->cu_total.tv_sec = tv->tv_sec;`
459			`cu->cu_total.tv_usec = tv->tv_usec;`
460			`break;`
461			`case CLGET_TIMEOUT:`
462			`if (info == NULL)`
463			`return(FALSE);`
464			`(struct timeval )info = cu->cu_total;`
465			`break;`
466			`case CLSET_RETRY_TIMEOUT:`
467			`if (info == NULL)`
468			`return(FALSE);`
469			`tv = (struct timeval *)info;`
470			`cu->cu_wait.tv_sec = tv->tv_sec;`
471			`cu->cu_wait.tv_usec = tv->tv_usec;`
472			`break;`
473			`case CLGET_RETRY_TIMEOUT:`
474			`if (info == NULL)`
475			`return(FALSE);`
476			`(struct timeval )info = cu->cu_wait;`
477			`break;`
478			`case CLGET_SERVER_ADDR:`
479			`if (info == NULL)`
480			`return(FALSE);`
481			`(struct sockaddr_in )info = cu->cu_raddr;`
482			`break;`
483			`case CLGET_FD:`
484			`if (info == NULL)`
485			`return(FALSE);`
486			`(int )info = cu->cu_sock;`
487			`break;`
488			`case CLGET_XID:`
489			`/*`
490			`* use the knowledge that xid is the`
491			`* first element in the call structure *.`
492			`* This will get the xid of the PREVIOUS call`
493			`*/`
494			`if (info == NULL)`
495			`return(FALSE);`
496			`(u_long )info = ntohl((u_long )cu->cu_outbuf);`
497			`break;`
498			`case CLSET_XID:`
499			`/* This will set the xid of the NEXT call */`
500			`if (info == NULL)`
501			`return(FALSE);`
502			`(u_long )cu->cu_outbuf = htonl((u_long )info - 1);`
503			`/* decrement by 1 as clntudp_call() increments once */`
504			`case CLGET_VERS:`
505			`/*`
506			`* This RELIES on the information that, in the call body,`
507			`* the version number field is the fifth field from the`
508			`* begining of the RPC header. MUST be changed if the`
509			`* call_struct is changed`
510			`*/`
511			`if (info == NULL)`
512			`return(FALSE);`
513			`(u_long )info = ntohl((u_long )(cu->cu_outbuf +`
514			`4 * BYTES_PER_XDR_UNIT));`
515			`break;`
516			`case CLSET_VERS:`
517			`if (info == NULL)`
518			`return(FALSE);`
519			`(u_long )(cu->cu_outbuf + 4 * BYTES_PER_XDR_UNIT)`
520			`= htonl((u_long )info);`
521			`break;`
522			`case CLGET_PROG:`
523			`/*`
524			`* This RELIES on the information that, in the call body,`
525			`* the program number field is the field from the`
526			`* begining of the RPC header. MUST be changed if the`
527			`* call_struct is changed`
528			`*/`
529			`if (info == NULL)`
530			`return(FALSE);`
531			`(u_long )info = ntohl((u_long )(cu->cu_outbuf +`
532			`3 * BYTES_PER_XDR_UNIT));`
533			`break;`
534			`case CLSET_PROG:`
535			`if (info == NULL)`
536			`return(FALSE);`
537			`(u_long )(cu->cu_outbuf + 3 * BYTES_PER_XDR_UNIT)`
538			`= htonl((u_long )info);`
539			`break;`
540			`case CLGET_LOCAL_ADDR:`
541			`len = sizeof(struct sockaddr);`
542			`if (getsockname(cu->cu_sock, (struct sockaddr *)info, &len) <0)`
543			`return(FALSE);`
544			`break;`
545			`case CLGET_SVC_ADDR:`
546			`case CLSET_SVC_ADDR:`
547			`case CLSET_PUSH_TIMOD:`
548			`case CLSET_POP_TIMOD:`
549			`default:`
550			`return (FALSE);`
551			`}`
552			`return (TRUE);`
553			`}`
554
555			`static void`
556			`clntudp_destroy(cl)`
557			`CLIENT *cl;`
558			`{`
559			`register struct cu_data cu = (struct cu_data )cl->cl_private;`
560
561			`if (cu->cu_closeit) {`
562			`(void)_close(cu->cu_sock);`
563			`}`
564			`XDR_DESTROY(&(cu->cu_outxdrs));`
565			`mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz));`
566			`mem_free((caddr_t)cl, sizeof(CLIENT));`
567			`}`