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-rw-r--r--sunrpc/portmap.c481
1 files changed, 481 insertions, 0 deletions
diff --git a/sunrpc/portmap.c b/sunrpc/portmap.c
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+++ b/sunrpc/portmap.c
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+/* @(#)portmap.c 2.3 88/08/11 4.0 RPCSRC */
+#ifndef lint
+static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 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/ioctl.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+
+char *malloc();
+int reg_service();
+void reap();
+struct pmaplist *pmaplist;
+static int debugging = 0;
+
+main()
+{
+ SVCXPRT *xprt;
+ int sock, pid, t;
+ struct sockaddr_in addr;
+ int len = sizeof(struct sockaddr_in);
+ register struct pmaplist *pml;
+
+#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);
+ }
+ /* 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) {
+ 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, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE))
+ == (SVCXPRT *)NULL) {
+ fprintf(stderr, "couldn't do tcp_create\n");
+ 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);
+
+ (void)signal(SIGCHLD, reap);
+ svc_run();
+ fprintf(stderr, "run_svc returned unexpectedly\n");
+ abort();
+}
+
+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, &reg))
+ 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) {
+ fprintf(stderr, "svc_sendreply\n");
+ abort();
+ }
+ }
+ break;
+
+ case PMAPPROC_UNSET:
+ /*
+ * Remove a program,version to port mapping.
+ */
+ if (!svc_getargs(xprt, xdr_pmap, &reg))
+ 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, &reg))
+ 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 ...
+ *
+ * This now forks so that the program & process that it calls can call
+ * back to the portmapper.
+ */
+static
+callit(rqstp, xprt)
+ struct svc_req *rqstp;
+ SVCXPRT *xprt;
+{
+ struct rmtcallargs a;
+ struct pmaplist *pml;
+ u_short port;
+ struct sockaddr_in me;
+ int pid, socket = -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, IPPROTO_UDP)) == NULL)
+ return;
+ /*
+ * fork a child to do the work. Parent immediately returns.
+ * Child exits upon completion.
+ */
+ if ((pid = fork()) != 0) {
+ if (debugging && (pid < 0)) {
+ fprintf(stderr, "portmap CALLIT: cannot fork.\n");
+ }
+ 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);
+ exit(0);
+}
+
+void
+reap()
+{
+ while (wait3(NULL, WNOHANG, NULL) > 0);
+}
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