4.3BSD-UWisc/src/lib/libc/rpc/pmap_rmt.c
#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] =
"$Header: pmap_rmt.c,v 1.4 86/11/11 09:00:04 tadl Exp $";
#endif
/*
* RCS info
* $Locker: $
*/
/* NFSSRC @(#)pmap_rmt.c 2.1 86/04/14 */
#if defined(SUN_SCCS) && !defined(lint)
static char sccsid[] = "@(#)pmap_rmt.c 1.1 86/02/03 Copyr 1984 Sun Micro";
#endif
/*
* pmap_rmt.c
* Client interface to pmap rpc service.
* remote call and broadcast service
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include "types.h"
#include <netinet/in.h>
#include "xdr.h"
#include "auth.h"
#include "clnt.h"
#include "rpc_msg.h"
#include "pmap_prot.h"
#include "pmap_clnt.h"
#include <sys/socket.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#define MAX_BROADCAST_SIZE 1400
extern int errno;
static struct timeval timeout = { 3, 0 };
/*
* Structures and XDR routines for parameters to and replys from
* the pmapper remote-call-service.
*/
struct rmtcallargs {
u_long prog, vers, proc, arglen;
caddr_t args_ptr;
xdrproc_t xdr_args;
};
static bool_t xdr_rmtcall_args();
struct rmtcallres {
u_long *port_ptr;
u_long resultslen;
caddr_t results_ptr;
xdrproc_t xdr_results;
};
static bool_t xdr_rmtcallres();
/*
* 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;
}
(void)close(socket);
addr->sin_port = 0;
return (stat);
}
/*
* XDR remote call arguments
* written for XDR_ENCODE direction only
*/
static 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
*/
static bool_t
xdr_rmtcallres(xdrs, crp)
register XDR *xdrs;
register struct rmtcallres *crp;
{
if (xdr_reference(xdrs, &crp->port_ptr, sizeof (u_long), xdr_u_long) &&
xdr_u_long(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 .
*/
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;
int n, i;
ifc.ifc_len = MAX_BROADCAST_SIZE;
ifc.ifc_buf = buf;
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 BSD4_3
if (ioctl(sock, SIOCGIFBRDADDR, (caddr_t)&ifreq) < 0) {
perror("broadcast: ioctl (get broadcast addr)");
continue;
}
sin = (struct sockaddr_in *)&ifr->ifr_addr;
addrs[i++] = sin->sin_addr.s_addr;
#else
sin = (struct sockaddr_in *)&ifr->ifr_addr;
addrs[i++] = inet_makeaddr(inet_netof
(sin->sin_addr.s_addr), INADDR_ANY);
#endif BSD4_3
}
}
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, readfds, nets;
register int sock, mask, 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;
char outbuf[MAX_BROADCAST_SIZE], inbuf[MAX_BROADCAST_SIZE];
/*
* 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;
}
{
int on = 1;
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&on,
sizeof(on)) < 0) {
perror("Cannot set broadcast flag for rpc");
stat = RPC_CANTSEND;
goto done_broad;
}
}
mask = (1 << sock);
nets = getbroadcastnets(addrs, sock, inbuf);
bzero(&baddr, sizeof (baddr));
baddr.sin_family = AF_INET;
baddr.sin_port = htons(PMAPPORT);
baddr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
(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 socketaddr *)&baddr,
sizeof (struct sockaddr)) != outlen) {
perror("Cannot send broadcast packet");
stat = RPC_CANTSEND;
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;
readfds = mask;
switch (select(32, &readfds, (int *)NULL, (int *)NULL, &t)) {
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 */
if ((readfds & mask) == 0)
goto recv_again;
try_again:
fromlen = sizeof(struct sockaddr);
inlen = recvfrom(sock, inbuf, MAX_BROADCAST_SIZE, 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_long))
goto recv_again;
/*
* see if reply transaction id matches sent id.
* If so, decode the results.
*/
xdrmem_create(xdrs, inbuf, 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)close(sock);
AUTH_DESTROY(unix_auth);
return (stat);
}