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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
218 lines
5.9 KiB
C
218 lines
5.9 KiB
C
/* Copyright (C) 1997-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <rpc/pmap_prot.h>
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#include <rpc/pmap_clnt.h>
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#include <rpcsvc/nis.h>
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#include "nis_intern.h"
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/* Private data kept per client handle, from sunrpc/clnt_udp.c */
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struct cu_data
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{
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int cu_sock;
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bool_t cu_closeit;
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struct sockaddr_in cu_raddr;
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int cu_rlen;
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struct timeval cu_wait;
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struct timeval cu_total;
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struct rpc_err cu_error;
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XDR cu_outxdrs;
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u_int cu_xdrpos;
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u_int cu_sendsz;
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char *cu_outbuf;
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u_int cu_recvsz;
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char cu_inbuf[1];
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};
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/*
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* Find the mapped port for program,version.
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* Calls the pmap service remotely to do the lookup.
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* Returns 0 if no map exists.
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*/
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u_short
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__pmap_getnisport (struct sockaddr_in *address, u_long program,
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u_long version, u_int protocol)
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{
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return __libc_rpc_getport (address, program, version, protocol, 1, 1);
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}
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/* This is now the public function, which should find the fastest server */
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struct findserv_req
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{
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struct sockaddr_in sin;
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uint32_t xid;
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u_int server_nr;
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u_int server_ep;
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};
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static long int
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__nis_findfastest_with_timeout (dir_binding *bind,
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const struct timeval *timeout)
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{
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static const struct timeval TIMEOUT00 = { 0, 0 };
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struct findserv_req *pings;
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struct sockaddr_in sin, saved_sin;
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int found = -1;
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uint32_t xid_seed;
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int sock, dontblock = 1;
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CLIENT *clnt;
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u_long i, j, pings_count, pings_max, fastest = -1;
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struct cu_data *cu;
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pings_max = bind->server_len * 2; /* Reserve a little bit more memory
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for multihomed hosts */
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pings_count = 0;
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pings = malloc (sizeof (struct findserv_req) * pings_max);
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xid_seed = (uint32_t) (time (NULL) ^ getpid ());
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if (__glibc_unlikely (pings == NULL))
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return -1;
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memset (&sin, '\0', sizeof (sin));
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sin.sin_family = AF_INET;
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for (i = 0; i < bind->server_len; i++)
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for (j = 0; j < bind->server_val[i].ep.ep_len; ++j)
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if (strcmp (bind->server_val[i].ep.ep_val[j].family, "inet") == 0)
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if ((bind->server_val[i].ep.ep_val[j].proto == NULL)
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|| (bind->server_val[i].ep.ep_val[j].proto[0] == '-')
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|| (bind->server_val[i].ep.ep_val[j].proto[0] == '\0'))
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{
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sin.sin_addr.s_addr =
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inetstr2int (bind->server_val[i].ep.ep_val[j].uaddr);
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if (sin.sin_addr.s_addr == 0)
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continue;
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sin.sin_port = htons (__pmap_getnisport (&sin, NIS_PROG,
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NIS_VERSION,
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IPPROTO_UDP));
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if (sin.sin_port == 0)
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continue;
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if (pings_count >= pings_max)
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{
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struct findserv_req *new_pings;
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pings_max += 10;
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new_pings = realloc (pings, sizeof (struct findserv_req) *
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pings_max);
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if (__glibc_unlikely (new_pings == NULL))
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{
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free (pings);
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return -1;
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}
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pings = new_pings;
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}
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memcpy ((char *) &pings[pings_count].sin, (char *) &sin,
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sizeof (sin));
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memcpy ((char *)&saved_sin, (char *)&sin, sizeof (sin));
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pings[pings_count].xid = xid_seed + pings_count;
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pings[pings_count].server_nr = i;
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pings[pings_count].server_ep = j;
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++pings_count;
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}
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/* Make sure at least one server was assigned */
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if (pings_count == 0)
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{
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free (pings);
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return -1;
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}
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/* Create RPC handle */
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sock = socket (AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, IPPROTO_UDP);
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clnt = clntudp_create (&saved_sin, NIS_PROG, NIS_VERSION, *timeout, &sock);
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if (clnt == NULL)
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{
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close (sock);
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free (pings);
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return -1;
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}
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auth_destroy (clnt->cl_auth);
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clnt->cl_auth = authunix_create_default ();
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cu = (struct cu_data *) clnt->cl_private;
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ioctl (sock, FIONBIO, &dontblock);
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/* Send to all servers the NULLPROC */
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for (i = 0; i < pings_count; ++i)
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{
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/* clntudp_call() will increment, subtract one */
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*((uint32_t *) (cu->cu_outbuf)) = pings[i].xid - 1;
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memcpy ((char *) &cu->cu_raddr, (char *) &pings[i].sin,
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sizeof (struct sockaddr_in));
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/* Transmit to NULLPROC, return immediately. */
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clnt_call (clnt, NULLPROC,
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(xdrproc_t) xdr_void, (caddr_t) 0,
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(xdrproc_t) xdr_void, (caddr_t) 0, TIMEOUT00);
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}
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while (found == -1) {
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/* Receive reply from NULLPROC asynchronously. Note null inproc. */
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int rc = clnt_call (clnt, NULLPROC,
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(xdrproc_t) NULL, (caddr_t) 0,
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(xdrproc_t) xdr_void, (caddr_t) 0,
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*timeout);
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if (RPC_SUCCESS == rc) {
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uint32_t val;
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memcpy (&val, cu->cu_inbuf, sizeof (uint32_t));
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fastest = val - xid_seed;
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if (fastest < pings_count) {
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bind->server_used = pings[fastest].server_nr;
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bind->current_ep = pings[fastest].server_ep;
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found = 1;
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}
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} else {
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/* clnt_perror(clnt, "__nis_findfastest"); */
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break;
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}
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}
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auth_destroy (clnt->cl_auth);
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clnt_destroy (clnt);
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close (sock);
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free (pings);
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return found;
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}
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long int
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__nis_findfastest (dir_binding *bind)
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{
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struct timeval timeout = { __NIS_PING_TIMEOUT_START, 0 };
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long int found = -1;
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long int retry = __NIS_PING_RETRY + 1;
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while (retry--)
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{
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found = __nis_findfastest_with_timeout (bind, &timeout);
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if (found != -1)
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break;
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timeout.tv_sec += __NIS_PING_TIMEOUT_INCREMENT;
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}
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return found;
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}
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