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-rw-r--r--nis/nis_findserv.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/nis/nis_findserv.c b/nis/nis_findserv.c
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+++ b/nis/nis_findserv.c
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+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <rpc/pmap_prot.h>
+#include <rpc/pmap_clnt.h>
+#include <rpcsvc/nis.h>
+
+#include "nis_intern.h"
+
+/* Private data kept per client handle, from sunrpc/clnt_udp.c */
+struct cu_data
+  {
+    int cu_sock;
+    bool_t cu_closeit;
+    struct sockaddr_in cu_raddr;
+    int cu_rlen;
+    struct timeval cu_wait;
+    struct timeval cu_total;
+    struct rpc_err cu_error;
+    XDR cu_outxdrs;
+    u_int cu_xdrpos;
+    u_int cu_sendsz;
+    char *cu_outbuf;
+    u_int cu_recvsz;
+    char cu_inbuf[1];
+  };
+
+
+/* The following is the original routine from sunrpc/pm_getport.c.
+   The only change is the much shorter timeout. */
+/*
+ * pmap_getport.c
+ * Client interface to pmap rpc service.
+ *
+ * Copyright (C) 1984, Sun Microsystems, Inc.
+ */
+
+/*
+ * Find the mapped port for program,version.
+ * Calls the pmap service remotely to do the lookup.
+ * Returns 0 if no map exists.
+ */
+static u_short
+__pmap_getport (struct sockaddr_in *address, u_long program,
+		u_long version, u_int protocol)
+{
+  const struct timeval timeout = {1, 0};
+  const struct timeval tottimeout = {1, 0};
+  u_short port = 0;
+  int socket = -1;
+  CLIENT *client;
+  struct pmap parms;
+
+  address->sin_port = htons (PMAPPORT);
+  client = clntudp_bufcreate (address, PMAPPROG, PMAPVERS, timeout, &socket,
+			      RPCSMALLMSGSIZE, RPCSMALLMSGSIZE);
+  if (client != (CLIENT *) NULL)
+    {
+      parms.pm_prog = program;
+      parms.pm_vers = version;
+      parms.pm_prot = protocol;
+      parms.pm_port = 0;	/* not needed or used */
+      if (CLNT_CALL (client, PMAPPROC_GETPORT, (xdrproc_t) xdr_pmap,
+		     (caddr_t) & parms, (xdrproc_t) xdr_u_short,
+		     (caddr_t) & port, tottimeout) != RPC_SUCCESS)
+	{
+	  rpc_createerr.cf_stat = RPC_PMAPFAILURE;
+	  clnt_geterr (client, &rpc_createerr.cf_error);
+	}
+      else if (port == 0)
+	{
+	  rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
+	}
+      CLNT_DESTROY (client);
+    }
+  /* (void)close(socket); CLNT_DESTROY already closed it */
+  address->sin_port = 0;
+  return port;
+}
+
+/* Transmit to NULLPROC, return immediately. */
+static void *
+nis_null_3_send (void *argp, CLIENT * clnt)
+{
+  static char clnt_res;
+  struct timeval TIMEOUT = {0, 0};
+
+  memset ((char *) &clnt_res, 0, sizeof (clnt_res));
+  if (clnt_call (clnt, NULLPROC,
+		 (xdrproc_t) xdr_void, (caddr_t) argp,
+		 (xdrproc_t) xdr_void, (caddr_t) & clnt_res,
+		 TIMEOUT) != RPC_SUCCESS)
+    return NULL;
+  return (void *) &clnt_res;
+}
+
+/* Receive request from NULLPROC asynchronously. */
+static void *
+nis_null_3_recv (void *argp, CLIENT * clnt)
+{
+  static char clnt_res;
+  struct timeval TIMEOUT = {0, 0};
+
+  memset ((char *) &clnt_res, 0, sizeof (clnt_res));
+  if (clnt_call (clnt, NULLPROC,
+		 (xdrproc_t) NULL, (caddr_t) argp,
+		 (xdrproc_t) xdr_void, (caddr_t) & clnt_res,
+		 TIMEOUT) != RPC_SUCCESS)
+    return NULL;
+  return (void *) &clnt_res;
+}
+
+/* This is now the public functions, which should find the fastest server */
+
+struct findserv_req
+{
+  struct sockaddr_in sin;
+  u_long xid;
+  u_int server_nr;
+  u_int server_ep;
+};
+
+long
+__nis_findfastest (dir_binding * bind)
+{
+  struct timeval TIMEOUT = {5, 0};
+  struct findserv_req **pings;
+  struct sockaddr_in sin;
+  int found = -1;
+  time_t xid_seed, xid_lookup;
+  int sock, dontblock = 1;
+  CLIENT *clnt;
+  void *foo = NULL;
+  u_long i, j, pings_count, pings_max;
+  struct cu_data *cu;
+
+  pings_max = bind->server_len * 2;	/* Reserve a little bit more memory
+					   for multihomed hosts */
+  pings_count = 0;
+  pings = malloc (sizeof (struct findserv_req *) * pings_max);
+  xid_seed = time (NULL) ^ getpid ();
+
+  memset (&sin, '\0', sizeof (sin));
+  sin.sin_family = AF_INET;
+  for (i = 0; i < bind->server_len; i++)
+    for (j = 0; j < bind->server_val[i].ep.ep_len; ++j)
+      if (strcmp (bind->server_val[i].ep.ep_val[j].family, "inet") == 0)
+	if (strcmp (bind->server_val[i].ep.ep_val[j].proto, "-") == 0)
+	  {
+	    sin.sin_addr.s_addr =
+	      inetstr2int (bind->server_val[i].ep.ep_val[j].uaddr);
+	    if (sin.sin_addr.s_addr == 0)
+	      continue;
+	    sin.sin_port = htons (__pmap_getport (&sin, NIS_PROG,
+						  NIS_VERSION, IPPROTO_UDP));
+	    if (sin.sin_port == 0)
+	      continue;
+
+	    if (pings_count >= pings_max)
+	      {
+		pings_max += 10;
+		pings = realloc (pings, sizeof (struct findserv_req) *
+				 pings_max);
+	      }
+	    pings[pings_count] = calloc (1, sizeof (struct findserv_req));
+	    memcpy ((char *) &pings[pings_count]->sin, (char *) &sin,
+		    sizeof (sin));
+	    pings[pings_count]->xid = xid_seed;
+	    pings[pings_count]->server_nr = i;
+	    pings[pings_count]->server_ep = j;
+	    ++xid_seed;
+	    ++pings_count;
+	  }
+
+  /* Make sure at least one server was assigned */
+  if (pings_count == 0)
+    {
+      free (pings);
+      return -1;
+    }
+
+  /* Create RPC handle */
+  sock = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+  clnt = clntudp_create (&sin, NIS_PROG, NIS_VERSION, TIMEOUT, &sock);
+  if (clnt == NULL)
+    {
+      close (sock);
+      for (i = 0; i < pings_count; ++i)
+	free (pings[i]);
+      free (pings);
+      return -1;
+    }
+  clnt->cl_auth = authunix_create_default ();
+  cu = (struct cu_data *) clnt->cl_private;
+  TIMEOUT.tv_sec = 0;
+  clnt_control (clnt, CLSET_TIMEOUT, (char *) &TIMEOUT);
+  ioctl (sock, FIONBIO, &dontblock);
+
+  /* Send to all servers the NULLPROC */
+  for (i = 0; i < pings_count; ++i)
+    {
+      /* clntudp_call() will increment, subtract one */
+      *((u_int32_t *) (cu->cu_outbuf)) = pings[i]->xid - 1;
+      bcopy ((char *) &pings[i]->sin, (char *) &cu->cu_raddr,
+	     sizeof (struct sockaddr_in));
+      nis_null_3_send (foo, clnt);
+    }
+
+  /* Receive reply */
+  nis_null_3_recv (foo, clnt);
+
+  xid_lookup = *((u_int32_t *) (cu->cu_inbuf));
+  for (i = 0; i < pings_count; i++)
+    {
+      if (pings[i]->xid == xid_lookup)
+	{
+	  bind->server_used = pings[i]->server_nr;
+	  bind->current_ep = pings[i]->server_ep;
+	  found = 1;
+	}
+    }
+
+  auth_destroy (clnt->cl_auth);
+  clnt_destroy (clnt);
+  close (sock);
+
+  for (i = 0; i < pings_count; ++i)
+    free (pings[i]);
+  free (pings);
+
+  return found;
+}
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