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glibc/sunrpc/pmap_rmt.c

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/*
* pmap_rmt.c
* Client interface to pmap rpc service.
* remote call and broadcast service
*
* 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.
*/
#include <unistd.h>
#include <string.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_rmt.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <stdio.h>
#include <errno.h>
#undef _POSIX_SOURCE /* Ultrix <sys/param.h> needs --roland@gnu */
#include <sys/param.h> /* Ultrix needs before net/if --roland@gnu */
#include <net/if.h>
#include <ifaddrs.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#define MAX_BROADCAST_SIZE 1400
extern u_long _create_xid (void);
static const 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;
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,
(xdrproc_t)xdr_rmtcall_args,
(caddr_t)&a, (xdrproc_t)xdr_rmtcallres,
(caddr_t)&r, tout);
CLNT_DESTROY (client);
}
else
{
stat = RPC_FAILED;
}
/* (void)__close(socket); CLNT_DESTROY already closed it */
addr->sin_port = 0;
return stat;
}
libc_hidden_nolink_sunrpc (pmap_rmtcall, GLIBC_2_0)
/*
* 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_long (xdrs, &(cap->prog)) &&
xdr_u_long (xdrs, &(cap->vers)) &&
xdr_u_long (xdrs, &(cap->proc)))
{
u_long dummy_arglen = 0;
lenposition = XDR_GETPOS (xdrs);
if (!xdr_u_long (xdrs, &dummy_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;
}
libc_hidden_nolink_sunrpc (xdr_rmtcall_args, GLIBC_2_0)
/*
* XDR remote call results
* written for XDR_DECODE direction only
*/
bool_t
xdr_rmtcallres (xdrs, crp)
XDR *xdrs;
struct rmtcallres *crp;
{
caddr_t port_ptr;
port_ptr = (caddr_t) crp->port_ptr;
if (xdr_reference (xdrs, &port_ptr, sizeof (u_long),
(xdrproc_t) 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;
}
libc_hidden_nolink_sunrpc (xdr_rmtcallres, GLIBC_2_0)
/*
* 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
internal_function
getbroadcastnets (struct in_addr *addrs, int naddrs)
{
struct ifaddrs *ifa;
if (getifaddrs (&ifa) != 0)
{
perror ("broadcast: getifaddrs");
return 0;
}
int i = 0;
struct ifaddrs *run = ifa;
while (run != NULL && i < naddrs)
{
if ((run->ifa_flags & IFF_BROADCAST) != 0
&& (run->ifa_flags & IFF_UP) != 0
&& run->ifa_addr != NULL
&& run->ifa_addr->sa_family == AF_INET)
/* Copy the broadcast address. */
addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
run = run->ifa_next;
}
freeifaddrs (ifa);
return i;
}
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 = RPC_FAILED;
AUTH *unix_auth = authunix_create_default ();
XDR xdr_stream;
XDR *xdrs = &xdr_stream;
struct timeval t;
int outlen, inlen, nets;
socklen_t fromlen;
int sock;
int on = 1;
struct pollfd fd;
int milliseconds;
int i;
bool_t done = FALSE;
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;
char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE];
/*
* 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 */
fd.fd = sock;
fd.events = POLLIN;
nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
__bzero ((char *) &baddr, 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); */
msg.rm_xid = xid = _create_xid ();
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 = _null_auth;
msg.acpted_rply.ar_results.where = (caddr_t) & r;
msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres;
milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000;
switch (__poll(&fd, 1, milliseconds))
{
case 0: /* timed out */
stat = RPC_TIMEDOUT;
continue;
case -1: /* some kind of error */
if (errno == EINTR)
goto recv_again;
perror (_("Broadcast poll problem"));
stat = RPC_CANTRECV;
goto done_broad;
} /* end of poll 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 (u_long))
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 (((u_int32_t) msg.rm_xid == (u_int32_t) 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 ((u_int32_t) msg.rm_xid == (u_int32_t) xid)
fprintf (stderr, "Broadcast deserialization problem");
/* otherwise, just random garbage */
#endif
}
xdrs->x_op = XDR_FREE;
msg.acpted_rply.ar_results.proc = (xdrproc_t)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) __close (sock);
AUTH_DESTROY (unix_auth);
return stat;
}
libc_hidden_nolink_sunrpc (clnt_broadcast, GLIBC_2_0)
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