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portmap.c
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1994-05-03
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498 lines
RCS_ID_C="$Id: portmap.c,v 3.9 1994/05/02 19:52:55 jraja Exp $";
/*
* portmap.c -- implements the program, version to port number mapping for rpc
*/
#include "portmap_rev.h"
static const char version[] = VERSTAG
" Copyright © 1994 AmiTCP/IP Group, <amitcp-group@hut.fi>\n"
"Helsinki University of Technology, Finland.\n"
"Copyright © 1990 The Regents of the University of California.\n"
"All rights reserved.\n";
/****** netutil.doc/portmap *************************************************
NAME
portmap - DARPA port to RPC program number mapper
SYNOPSIS
AmiTCP:bin/portmap
DESCRIPTION
`portmap' is a server that converts RPC program numbers into DARPA
protocol port numbers. It must be running in order to make RPC
calls. When an RPC server is started, it will tell `portmap' what
port number it is listening to, and what RPC program numbers it is
prepared to serve. When a client wishes to make an RPC call to a
given program number, it will first contact `portmap' on the
server machine to determine the port number where RPC packets
should be sent. Normally, standard RPC servers are started by
`inetd', so `portmap' must be started before `inetd' is invoked.
SEE ALSO
netutil.doc/rpcinfo
BUGS
If `portmap' crashes, all servers must be restarted.
*****************************************************************************
*
*/
/*
* @(#)portmap.c 5.4 (Berkeley) 4/19/91
* @(#)portmap.c 2.3 88/08/11 4.0 RPCSRC
* @(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro";
*/
#include <rpc/rpc.h>
#include <rpc/pmap_prot.h>
#include <sys/syslog.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
void reg_service(struct svc_req *rqstp, SVCXPRT *xprt);
static void callit(struct svc_req *rqstp, SVCXPRT *xprt);
struct pmaplist *pmaplist;
int debugging = 0;
main(int argc, char **argv)
{
SVCXPRT *xprt;
int sock, c;
struct sockaddr_in addr = { 0 };
int len = sizeof(struct sockaddr_in);
register struct pmaplist *pml;
signal(SIGINT, SIG_IGN); /* Prevent ANSI Signal handling */
while ((c = getopt(argc, argv, "d")) != EOF) {
switch (c) {
case 'd':
debugging = 1;
break;
default:
(void) fprintf(stderr, "usage: %s [-d]\n", argv[0]);
exit(1);
}
}
openlog("portmap", debugging ? LOG_PID | LOG_PERROR : LOG_PID,
LOG_DAEMON);
#ifndef amigados
if (!debugging && daemon(0, 0)) {
(void) fprintf(stderr, "portmap: fork: %s", strerror(errno));
exit(1);
}
#else
/*
* We could probably detach here, but don't bother now...
*/
#endif
if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
syslog(LOG_ERR, "cannot create udp socket: %m");
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) {
syslog(LOG_ERR, "cannot bind udp: %m");
exit(1);
}
if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) {
syslog(LOG_ERR, "couldn't do udp_create");
exit(1);
}
/* make an entry for ourself */
pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
pml->pml_next = 0;
pml->pml_map.pm_prog = PMAPPROG;
pml->pml_map.pm_vers = PMAPVERS;
pml->pml_map.pm_prot = IPPROTO_UDP;
pml->pml_map.pm_port = PMAPPORT;
pmaplist = pml;
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
syslog(LOG_ERR, "cannot create tcp socket: %m");
exit(1);
}
if (bind(sock, (struct sockaddr *)&addr, len) != 0) {
syslog(LOG_ERR, "cannot bind udp: %m");
exit(1);
}
if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
== (SVCXPRT *)NULL) {
syslog(LOG_ERR, "couldn't do tcp_create");
exit(1);
}
/* make an entry for ourself */
pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaplist));
pml->pml_map.pm_prog = PMAPPROG;
pml->pml_map.pm_vers = PMAPVERS;
pml->pml_map.pm_prot = IPPROTO_TCP;
pml->pml_map.pm_port = PMAPPORT;
pml->pml_next = pmaplist;
pmaplist = pml;
(void)svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE);
svc_run();
syslog(LOG_ERR, "svc_run returned unexpectedly");
exit(0);
}
/*
* Overrides the strlib perror
*/
void
perror(const char *what)
{
syslog(LOG_ERR, "%s: %m", what);
}
static struct pmaplist *
find_service(u_long prog, u_long vers, u_long prot)
{
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
*/
void
reg_service(struct svc_req *rqstp, SVCXPRT *xprt)
{
struct pmap reg;
struct pmaplist *pml, *prevpml, *fnd;
int ans, port;
caddr_t t;
if (debugging)
(void) fprintf(stderr, "server: about do a switch\n");
switch (rqstp->rq_proc) {
case PMAPPROC_NULL:
/*
* Null proc call
*/
if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) {
exit(20);
}
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 END of list
*/
pml = (struct pmaplist *)
malloc((u_int)sizeof(struct pmaplist));
pml->pml_map = reg;
pml->pml_next = 0;
if (pmaplist == 0) {
pmaplist = pml;
} else {
for (fnd= pmaplist; fnd->pml_next != 0;
fnd = fnd->pml_next);
fnd->pml_next = pml;
}
ans = 1;
}
done:
if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) &&
debugging) {
(void) fprintf(stderr, "svc_sendreply\n");
exit(20);
}
}
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) {
(void) fprintf(stderr, "svc_sendreply\n");
exit(20);
}
}
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) {
(void) fprintf(stderr, "svc_sendreply\n");
exit(20);
}
}
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) {
(void) fprintf(stderr, "svc_sendreply\n");
exit(20);
}
}
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
struct encap_parms {
u_int arglen;
char *args;
};
static bool_t XDRFUN
xdr_encap_parms(XDR *xdrs, struct encap_parms *epp)
{
return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE));
}
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 XDRFUN
xdr_rmtcall_args(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 XDRFUN
xdr_rmtcall_result(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 XDRFUN
xdr_opaque_parms(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 parameters
* and then calls xdr_opaque_parms.
*/
static bool_t XDRFUN
xdr_len_opaque_parms(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 ...
*
* This now forks so that the program & process that it calls can call
* back to the portmapper.
*/
static void
callit(struct svc_req *rqstp, SVCXPRT *xprt)
{
struct rmtcallargs a;
struct pmaplist *pml;
u_short port;
struct sockaddr_in me;
#ifndef amigados /* forking not supported */
int pid;
#endif
int so = -1;
CLIENT *client;
struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred;
struct timeval timeout;
char buf[ARGSIZE];
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,
(u_long)IPPROTO_UDP)) == NULL)
return;
#ifndef amigados /* forking not supported */
/*
* fork a child to do the work. Parent immediately returns.
* Child exits upon completion.
*/
if ((pid = fork()) != 0) {
if (pid < 0)
syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m",
a.rmt_prog);
return;
}
#endif
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, &so);
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, (caddr_t)&a);
}
AUTH_DESTROY(client->cl_auth);
clnt_destroy(client);
}
(void)CloseSocket(so);
exit(0);
}
#ifndef amigados /* forking not supported */
void
reap()
{
while (wait3((int *)NULL, WNOHANG, (struct rusage *)NULL) > 0);
}
#endif