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- 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
-