4.3BSD/usr/contrib/sunrpc/portmap.c
#ifndef lint
static char sccsid[] = "@(#)portmap.c 1.2 85/03/13 Copyr 1984 Sun Micro";
#endif
/*
* Copyright (c) 1984 by Sun Microsystems, Inc.
*/
/*
* portmap.c, Implements the program,version to port number mapping for
* rpc.
*/
/*
* 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
*/
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <stdio.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/ioctl.h>
char *malloc();
int reg_service();
static int debugging = 0;
main()
{
SVCXPRT *xprt;
int sock, pid, t;
struct sockaddr_in addr;
int len = sizeof(struct sockaddr_in);
#ifndef DEBUG
pid = fork();
if (pid < 0) {
perror("portmap: fork");
exit(1);
}
if (pid != 0)
exit(0);
for (t = 0; t < 20; t++)
close(t);
open("/", 0);
dup2(0, 1);
dup2(0, 2);
t = open("/dev/tty", 2);
if (t >= 0) {
ioctl(t, TIOCNOTTY, (char *)0);
close(t);
}
#endif
if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
perror("portmap cannot create socket");
exit(1);
}
addr.sin_addr.s_addr = 0;
addr.sin_family = AF_INET;
addr.sin_port = htons(PMAPPORT);
if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
perror("portmap cannot bind");
exit(1);
}
if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
fprintf(stderr, "couldn't do udp_create\n");
exit(1);
}
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
perror("portmap cannot create socket");
exit(1);
}
if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
perror("portmap cannot bind");
exit(1);
}
if ((xprt = svctcp_create(sock, 0, 0)) == (SVCXPRT *)NULL) {
fprintf(stderr, "couldn't do tcp_create\n");
exit(1);
}
(void)svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);
svc_run();
fprintf(stderr, "run_svc returned unexpectedly\n");
abort();
}
struct pmaplist *pmaplist;
static struct pmaplist *
find_service(prog, vers, prot)
u_long prog;
u_long vers;
{
register struct pmaplist *hit = NULL;
register struct pmaplist *pml;
for (pml = pmaplist; pml != NULL; pml = pml->pml_next) {
if ((pml->pml_map.pm_prog != prog) ||
(pml->pml_map.pm_prot != prot))
continue;
hit = pml;
if (pml->pml_map.pm_vers == vers)
break;
}
return (hit);
}
/*
* 1 OK, 0 not
*/
reg_service(rqstp, xprt)
struct svc_req *rqstp;
SVCXPRT *xprt;
{
struct pmap reg;
struct pmaplist *pml, *prevpml, *fnd;
int ans, port;
caddr_t t;
#ifdef DEBUG
fprintf(stderr, "server: about do a switch\n");
#endif
switch (rqstp->rq_proc) {
case PMAPPROC_NULL:
/*
* Null proc call
*/
if ((!svc_sendreply(xprt, xdr_void, NULL)) && debugging) {
abort();
}
break;
case PMAPPROC_SET:
/*
* Set a program,version to port mapping
*/
if (!svc_getargs(xprt, xdr_pmap, ®))
svcerr_decode(xprt);
else {
/*
* check to see if already used
* find_service returns a hit even if
* the versions don't match, so check for it
*/
fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) {
if (fnd->pml_map.pm_port == reg.pm_port) {
ans = 1;
goto done;
}
else {
ans = 0;
goto done;
}
} else {
/*
* add to list
*/
pml = (struct pmaplist *)
malloc((u_int)sizeof(struct pmaplist));
pml->pml_map = reg;
pml->pml_next = pmaplist;
pmaplist = pml;
ans = 1;
}
done:
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
debugging) {
fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_UNSET:
/*
* Remove a program,version to port mapping.
*/
if (!svc_getargs(xprt, xdr_pmap, ®))
svcerr_decode(xprt);
else {
ans = 0;
for (prevpml = NULL, pml = pmaplist; pml != NULL; ) {
if ((pml->pml_map.pm_prog != reg.pm_prog) ||
(pml->pml_map.pm_vers != reg.pm_vers)) {
/* both pml & prevpml move forwards */
prevpml = pml;
pml = pml->pml_next;
continue;
}
/* found it; pml moves forward, prevpml stays */
ans = 1;
t = (caddr_t)pml;
pml = pml->pml_next;
if (prevpml == NULL)
pmaplist = pml;
else
prevpml->pml_next = pml;
free(t);
}
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
debugging) {
fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_GETPORT:
/*
* Lookup the mapping for a program,version and return its port
*/
if (!svc_getargs(xprt, xdr_pmap, ®))
svcerr_decode(xprt);
else {
fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot);
if (fnd)
port = fnd->pml_map.pm_port;
else
port = 0;
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) &&
debugging) {
fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_DUMP:
/*
* Return the current set of mapped program,version
*/
if (!svc_getargs(xprt, xdr_void, NULL))
svcerr_decode(xprt);
else {
if ((!svc_sendreply(xprt, xdr_pmaplist,
(caddr_t)&pmaplist)) && debugging) {
fprintf(stderr, "svc_sendreply\n");
abort();
}
}
break;
case PMAPPROC_CALLIT:
/*
* Calls a procedure on the local machine. If the requested
* procedure is not registered this procedure does not return
* error information!!
* This procedure is only supported on rpc/udp and calls via
* rpc/udp. It passes null authentication parameters.
*/
callit(rqstp, xprt);
break;
default:
svcerr_noproc(xprt);
break;
}
}
/*
* Stuff for the rmtcall service
*/
#define ARGSIZE 9000
typedef struct encap_parms {
u_long arglen;
char *args;
};
static bool_t
xdr_encap_parms(xdrs, epp)
XDR *xdrs;
struct encap_parms *epp;
{
return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
}
typedef struct rmtcallargs {
u_long rmt_prog;
u_long rmt_vers;
u_long rmt_port;
u_long rmt_proc;
struct encap_parms rmt_args;
};
static bool_t
xdr_rmtcall_args(xdrs, cap)
register XDR *xdrs;
register struct rmtcallargs *cap;
{
/* does not get a port number */
if (xdr_u_long(xdrs, &(cap->rmt_prog)) &&
xdr_u_long(xdrs, &(cap->rmt_vers)) &&
xdr_u_long(xdrs, &(cap->rmt_proc))) {
return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
}
return (FALSE);
}
static bool_t
xdr_rmtcall_result(xdrs, cap)
register XDR *xdrs;
register struct rmtcallargs *cap;
{
if (xdr_u_long(xdrs, &(cap->rmt_port)))
return (xdr_encap_parms(xdrs, &(cap->rmt_args)));
return (FALSE);
}
/*
* only worries about the struct encap_parms part of struct rmtcallargs.
* The arglen must already be set!!
*/
static bool_t
xdr_opaque_parms(xdrs, cap)
XDR *xdrs;
struct rmtcallargs *cap;
{
return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen));
}
/*
* This routine finds and sets the length of incoming opaque paraters
* and then calls xdr_opaque_parms.
*/
static bool_t
xdr_len_opaque_parms(xdrs, cap)
register XDR *xdrs;
struct rmtcallargs *cap;
{
register u_int beginpos, lowpos, highpos, currpos, pos;
beginpos = lowpos = pos = xdr_getpos(xdrs);
highpos = lowpos + ARGSIZE;
while ((int)(highpos - lowpos) >= 0) {
currpos = (lowpos + highpos) / 2;
if (xdr_setpos(xdrs, currpos)) {
pos = currpos;
lowpos = currpos + 1;
} else {
highpos = currpos - 1;
}
}
xdr_setpos(xdrs, beginpos);
cap->rmt_args.arglen = pos - beginpos;
return (xdr_opaque_parms(xdrs, cap));
}
/*
* Call a remote procedure service
* This procedure is very quiet when things go wrong.
* The proc is written to support broadcast rpc. In the broadcast case,
* a machine should shut-up instead of complain, less the requestor be
* overrun with complaints at the expense of not hearing a valid reply ...
*/
static
callit(rqstp, xprt)
struct svc_req *rqstp;
SVCXPRT *xprt;
{
char buf[2000];
struct rmtcallargs a;
struct pmaplist *pml;
u_short port;
struct sockaddr_in me;
int socket = -1;
CLIENT *client;
struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
struct timeval timeout;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
a.rmt_args.args = buf;
if (!svc_getargs(xprt, xdr_rmtcall_args, &a))
return;
if ((pml = find_service(a.rmt_prog, a.rmt_vers, IPPROTO_UDP)) == NULL)
return;
port = pml->pml_map.pm_port;
get_myaddress(&me);
me.sin_port = htons(port);
client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &socket);
if (client != (CLIENT *)NULL) {
if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) {
client->cl_auth = authunix_create(au->aup_machname,
au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids);
}
a.rmt_port = (u_long)port;
if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a,
xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) {
svc_sendreply(xprt, xdr_rmtcall_result, &a);
}
AUTH_DESTROY(client->cl_auth);
clnt_destroy(client);
}
(void)close(socket);
}