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6924e68e11
fail with "bind: address already in use". This problem was reported to the freebsd-stable@ mailing list on Feb. 19 under the subject heading "statd/lockd startup failure" by george+freebsd at m5p dot com. The problem is that the first combination of {udp,tcp X ipv4,ipv6} would select a port# dynamically, but one of the other three combinations would have that port# already in use. The patch is somewhat involved because it was requested by dougb@ that the four combinations use the same port# wherever possible. The patch splits the create_service() function into two functions. The first goes as far as bind(2) in a loop for up to GETPORT_MAXTRY - 1 times, attempting to use the same port# for all four cases. If these attempts fail, the last attempt allows the 4 cases to use different port #s. After this function has succeeded, the second function, called complete_service(), does the rest of what create_service() did. The three daemons mountd, rpc.lockd and rpc.statd all have a create_service() function that is patched in a similar way. However, create_service() has non-trivial differences for the three daemons that made it impractical to share the same functions between them. Reviewed by: jhb MFC after: 2 weeks
656 lines
17 KiB
C
656 lines
17 KiB
C
/*
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* Copyright (c) 1995
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* A.R. Gordon (andrew.gordon@net-tel.co.uk). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the FreeBSD project
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ANDREW GORDON AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/* main() function for status monitor daemon. Some of the code in this */
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/* file was generated by running rpcgen /usr/include/rpcsvc/sm_inter.x */
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/* The actual program logic is in the file procs.c */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <rpc/rpc.h>
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#include <rpc/rpc_com.h>
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#include <string.h>
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#include <syslog.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <signal.h>
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#include <unistd.h>
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#include "statd.h"
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#define GETPORT_MAXTRY 20 /* Max tries to get a port # */
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int debug = 0; /* Controls syslog() calls for debug messages */
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char **hosts, *svcport_str = NULL;
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int nhosts = 0;
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int xcreated = 0;
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static int mallocd_svcport = 0;
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static int *sock_fd;
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static int sock_fdcnt;
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static int sock_fdpos;
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static int create_service(struct netconfig *nconf);
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static void complete_service(struct netconfig *nconf, char *port_str);
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static void clearout_service(void);
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static void handle_sigchld(int sig);
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void out_of_mem(void);
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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struct sigaction sa;
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struct netconfig *nconf;
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void *nc_handle;
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in_port_t svcport;
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int ch, i, s;
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char *endptr, **hosts_bak;
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int have_v6 = 1;
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int maxrec = RPC_MAXDATASIZE;
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int attempt_cnt, port_len, port_pos, ret;
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char **port_list;
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while ((ch = getopt(argc, argv, "dh:p:")) != -1)
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switch (ch) {
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case 'd':
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debug = 1;
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break;
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case 'h':
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++nhosts;
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hosts_bak = hosts;
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hosts_bak = realloc(hosts, nhosts * sizeof(char *));
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if (hosts_bak == NULL) {
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if (hosts != NULL) {
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for (i = 0; i < nhosts; i++)
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free(hosts[i]);
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free(hosts);
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out_of_mem();
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}
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}
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hosts = hosts_bak;
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hosts[nhosts - 1] = strdup(optarg);
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if (hosts[nhosts - 1] == NULL) {
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for (i = 0; i < (nhosts - 1); i++)
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free(hosts[i]);
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free(hosts);
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out_of_mem();
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}
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break;
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case 'p':
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endptr = NULL;
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svcport = (in_port_t)strtoul(optarg, &endptr, 10);
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if (endptr == NULL || *endptr != '\0' || svcport == 0 ||
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svcport >= IPPORT_MAX)
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usage();
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svcport_str = strdup(optarg);
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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(void)rpcb_unset(SM_PROG, SM_VERS, NULL);
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/*
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* Check if IPv6 support is present.
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*/
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s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
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if (s < 0)
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have_v6 = 0;
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else
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close(s);
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rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
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/*
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* If no hosts were specified, add a wildcard entry to bind to
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* INADDR_ANY. Otherwise make sure 127.0.0.1 and ::1 are added to the
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* list.
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*/
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if (nhosts == 0) {
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hosts = malloc(sizeof(char**));
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if (hosts == NULL)
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out_of_mem();
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hosts[0] = "*";
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nhosts = 1;
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} else {
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hosts_bak = hosts;
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if (have_v6) {
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hosts_bak = realloc(hosts, (nhosts + 2) *
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sizeof(char *));
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if (hosts_bak == NULL) {
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for (i = 0; i < nhosts; i++)
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free(hosts[i]);
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free(hosts);
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out_of_mem();
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} else
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hosts = hosts_bak;
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nhosts += 2;
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hosts[nhosts - 2] = "::1";
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} else {
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hosts_bak = realloc(hosts, (nhosts + 1) * sizeof(char *));
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if (hosts_bak == NULL) {
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for (i = 0; i < nhosts; i++)
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free(hosts[i]);
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free(hosts);
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out_of_mem();
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} else {
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nhosts += 1;
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hosts = hosts_bak;
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}
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}
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hosts[nhosts - 1] = "127.0.0.1";
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}
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attempt_cnt = 1;
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sock_fdcnt = 0;
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sock_fd = NULL;
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port_list = NULL;
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port_len = 0;
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nc_handle = setnetconfig();
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while ((nconf = getnetconfig(nc_handle))) {
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/* We want to listen only on udp6, tcp6, udp, tcp transports */
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if (nconf->nc_flag & NC_VISIBLE) {
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/* Skip if there's no IPv6 support */
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if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
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/* DO NOTHING */
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} else {
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ret = create_service(nconf);
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if (ret == 1)
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/* Ignore this call */
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continue;
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if (ret < 0) {
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/*
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* Failed to bind port, so close off
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* all sockets created and try again
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* if the port# was dynamically
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* assigned via bind(2).
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*/
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clearout_service();
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if (mallocd_svcport != 0 &&
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attempt_cnt < GETPORT_MAXTRY) {
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free(svcport_str);
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svcport_str = NULL;
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mallocd_svcport = 0;
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} else {
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errno = EADDRINUSE;
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syslog(LOG_ERR,
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"bindresvport_sa: %m");
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exit(1);
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}
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/* Start over at the first service. */
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free(sock_fd);
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sock_fdcnt = 0;
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sock_fd = NULL;
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nc_handle = setnetconfig();
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attempt_cnt++;
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} else if (mallocd_svcport != 0 &&
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attempt_cnt == GETPORT_MAXTRY) {
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/*
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* For the last attempt, allow
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* different port #s for each nconf
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* by saving the svcport_str and
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* setting it back to NULL.
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*/
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port_list = realloc(port_list,
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(port_len + 1) * sizeof(char *));
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if (port_list == NULL)
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out_of_mem();
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port_list[port_len++] = svcport_str;
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svcport_str = NULL;
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mallocd_svcport = 0;
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}
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}
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}
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}
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/*
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* Successfully bound the ports, so call complete_service() to
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* do the rest of the setup on the service(s).
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*/
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sock_fdpos = 0;
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port_pos = 0;
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nc_handle = setnetconfig();
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while ((nconf = getnetconfig(nc_handle))) {
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/* We want to listen only on udp6, tcp6, udp, tcp transports */
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if (nconf->nc_flag & NC_VISIBLE) {
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/* Skip if there's no IPv6 support */
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if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
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/* DO NOTHING */
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} else if (port_list != NULL) {
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if (port_pos >= port_len) {
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syslog(LOG_ERR, "too many port#s");
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exit(1);
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}
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complete_service(nconf, port_list[port_pos++]);
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} else
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complete_service(nconf, svcport_str);
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}
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}
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endnetconfig(nc_handle);
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free(sock_fd);
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if (port_list != NULL) {
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for (port_pos = 0; port_pos < port_len; port_pos++)
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free(port_list[port_pos]);
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free(port_list);
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}
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init_file("/var/db/statd.status");
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/* Note that it is NOT sensible to run this program from inetd - the */
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/* protocol assumes that it will run immediately at boot time. */
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daemon(0, 0);
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openlog("rpc.statd", 0, LOG_DAEMON);
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if (debug) syslog(LOG_INFO, "Starting - debug enabled");
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else syslog(LOG_INFO, "Starting");
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/* Install signal handler to collect exit status of child processes */
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sa.sa_handler = handle_sigchld;
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sigemptyset(&sa.sa_mask);
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sigaddset(&sa.sa_mask, SIGCHLD);
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sa.sa_flags = SA_RESTART;
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sigaction(SIGCHLD, &sa, NULL);
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/* Initialisation now complete - start operating */
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notify_hosts(); /* Forks a process (if necessary) to do the */
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/* SM_NOTIFY calls, which may be slow. */
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svc_run(); /* Should never return */
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exit(1);
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}
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/*
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* This routine creates and binds sockets on the appropriate
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* addresses. It gets called one time for each transport.
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* It returns 0 upon success, 1 for ingore the call and -1 to indicate
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* bind failed with EADDRINUSE.
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* Any file descriptors that have been created are stored in sock_fd and
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* the total count of them is maintained in sock_fdcnt.
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*/
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static int
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create_service(struct netconfig *nconf)
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{
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struct addrinfo hints, *res = NULL;
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struct sockaddr_in *sin;
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struct sockaddr_in6 *sin6;
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struct __rpc_sockinfo si;
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int aicode;
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int fd;
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int nhostsbak;
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int r;
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u_int32_t host_addr[4]; /* IPv4 or IPv6 */
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int mallocd_res;
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if ((nconf->nc_semantics != NC_TPI_CLTS) &&
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(nconf->nc_semantics != NC_TPI_COTS) &&
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(nconf->nc_semantics != NC_TPI_COTS_ORD))
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return (1); /* not my type */
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/*
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* XXX - using RPC library internal functions.
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*/
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if (!__rpc_nconf2sockinfo(nconf, &si)) {
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syslog(LOG_ERR, "cannot get information for %s",
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nconf->nc_netid);
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return (1);
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}
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/* Get rpc.statd's address on this transport */
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memset(&hints, 0, sizeof hints);
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hints.ai_flags = AI_PASSIVE;
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hints.ai_family = si.si_af;
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hints.ai_socktype = si.si_socktype;
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hints.ai_protocol = si.si_proto;
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/*
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* Bind to specific IPs if asked to
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*/
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nhostsbak = nhosts;
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while (nhostsbak > 0) {
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--nhostsbak;
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sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
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if (sock_fd == NULL)
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out_of_mem();
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sock_fd[sock_fdcnt++] = -1; /* Set invalid for now. */
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mallocd_res = 0;
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/*
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* XXX - using RPC library internal functions.
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*/
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if ((fd = __rpc_nconf2fd(nconf)) < 0) {
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syslog(LOG_ERR, "cannot create socket for %s",
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nconf->nc_netid);
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continue;
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}
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switch (hints.ai_family) {
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case AF_INET:
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if (inet_pton(AF_INET, hosts[nhostsbak],
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host_addr) == 1) {
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hints.ai_flags |= AI_NUMERICHOST;
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} else {
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/*
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* Skip if we have an AF_INET6 address.
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*/
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if (inet_pton(AF_INET6, hosts[nhostsbak],
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host_addr) == 1) {
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close(fd);
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continue;
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}
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}
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break;
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case AF_INET6:
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if (inet_pton(AF_INET6, hosts[nhostsbak],
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host_addr) == 1) {
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hints.ai_flags |= AI_NUMERICHOST;
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} else {
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/*
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* Skip if we have an AF_INET address.
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*/
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if (inet_pton(AF_INET, hosts[nhostsbak],
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host_addr) == 1) {
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close(fd);
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continue;
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}
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}
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break;
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default:
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break;
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}
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/*
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* If no hosts were specified, just bind to INADDR_ANY
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*/
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if (strcmp("*", hosts[nhostsbak]) == 0) {
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if (svcport_str == NULL) {
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res = malloc(sizeof(struct addrinfo));
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if (res == NULL)
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out_of_mem();
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mallocd_res = 1;
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res->ai_flags = hints.ai_flags;
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res->ai_family = hints.ai_family;
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res->ai_protocol = hints.ai_protocol;
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switch (res->ai_family) {
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case AF_INET:
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sin = malloc(sizeof(struct sockaddr_in));
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if (sin == NULL)
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out_of_mem();
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sin->sin_family = AF_INET;
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sin->sin_port = htons(0);
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sin->sin_addr.s_addr = htonl(INADDR_ANY);
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res->ai_addr = (struct sockaddr*) sin;
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res->ai_addrlen = (socklen_t)
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sizeof(struct sockaddr_in);
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break;
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case AF_INET6:
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sin6 = malloc(sizeof(struct sockaddr_in6));
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if (sin6 == NULL)
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out_of_mem();
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = htons(0);
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sin6->sin6_addr = in6addr_any;
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res->ai_addr = (struct sockaddr*) sin6;
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res->ai_addrlen = (socklen_t)
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sizeof(struct sockaddr_in6);
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break;
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default:
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syslog(LOG_ERR, "bad addr fam %d",
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res->ai_family);
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exit(1);
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}
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} else {
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if ((aicode = getaddrinfo(NULL, svcport_str,
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&hints, &res)) != 0) {
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syslog(LOG_ERR,
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"cannot get local address for %s: %s",
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nconf->nc_netid,
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gai_strerror(aicode));
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close(fd);
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continue;
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}
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}
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} else {
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if ((aicode = getaddrinfo(hosts[nhostsbak], svcport_str,
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&hints, &res)) != 0) {
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syslog(LOG_ERR,
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"cannot get local address for %s: %s",
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nconf->nc_netid, gai_strerror(aicode));
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close(fd);
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continue;
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}
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}
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/* Store the fd. */
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sock_fd[sock_fdcnt - 1] = fd;
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/* Now, attempt the bind. */
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r = bindresvport_sa(fd, res->ai_addr);
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if (r != 0) {
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if (errno == EADDRINUSE && mallocd_svcport != 0) {
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if (mallocd_res != 0) {
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free(res->ai_addr);
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free(res);
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} else
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freeaddrinfo(res);
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return (-1);
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}
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syslog(LOG_ERR, "bindresvport_sa: %m");
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exit(1);
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}
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if (svcport_str == NULL) {
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svcport_str = malloc(NI_MAXSERV * sizeof(char));
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if (svcport_str == NULL)
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out_of_mem();
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mallocd_svcport = 1;
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if (getnameinfo(res->ai_addr,
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res->ai_addr->sa_len, NULL, NI_MAXHOST,
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|
svcport_str, NI_MAXSERV * sizeof(char),
|
|
NI_NUMERICHOST | NI_NUMERICSERV))
|
|
errx(1, "Cannot get port number");
|
|
}
|
|
if (mallocd_res != 0) {
|
|
free(res->ai_addr);
|
|
free(res);
|
|
} else
|
|
freeaddrinfo(res);
|
|
res = NULL;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Called after all the create_service() calls have succeeded, to complete
|
|
* the setup and registration.
|
|
*/
|
|
static void
|
|
complete_service(struct netconfig *nconf, char *port_str)
|
|
{
|
|
struct addrinfo hints, *res = NULL;
|
|
struct __rpc_sockinfo si;
|
|
struct netbuf servaddr;
|
|
SVCXPRT *transp = NULL;
|
|
int aicode, fd, nhostsbak;
|
|
int registered = 0;
|
|
|
|
if ((nconf->nc_semantics != NC_TPI_CLTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS) &&
|
|
(nconf->nc_semantics != NC_TPI_COTS_ORD))
|
|
return; /* not my type */
|
|
|
|
/*
|
|
* XXX - using RPC library internal functions.
|
|
*/
|
|
if (!__rpc_nconf2sockinfo(nconf, &si)) {
|
|
syslog(LOG_ERR, "cannot get information for %s",
|
|
nconf->nc_netid);
|
|
return;
|
|
}
|
|
|
|
nhostsbak = nhosts;
|
|
while (nhostsbak > 0) {
|
|
--nhostsbak;
|
|
if (sock_fdpos >= sock_fdcnt) {
|
|
/* Should never happen. */
|
|
syslog(LOG_ERR, "Ran out of socket fd's");
|
|
return;
|
|
}
|
|
fd = sock_fd[sock_fdpos++];
|
|
if (fd < 0)
|
|
continue;
|
|
|
|
if (nconf->nc_semantics != NC_TPI_CLTS)
|
|
listen(fd, SOMAXCONN);
|
|
|
|
transp = svc_tli_create(fd, nconf, NULL,
|
|
RPC_MAXDATASIZE, RPC_MAXDATASIZE);
|
|
|
|
if (transp != (SVCXPRT *) NULL) {
|
|
if (!svc_register(transp, SM_PROG, SM_VERS,
|
|
sm_prog_1, 0)) {
|
|
syslog(LOG_ERR, "can't register on %s",
|
|
nconf->nc_netid);
|
|
} else {
|
|
if (!svc_reg(transp, SM_PROG, SM_VERS,
|
|
sm_prog_1, NULL))
|
|
syslog(LOG_ERR,
|
|
"can't register %s SM_PROG service",
|
|
nconf->nc_netid);
|
|
}
|
|
} else
|
|
syslog(LOG_WARNING, "can't create %s services",
|
|
nconf->nc_netid);
|
|
|
|
if (registered == 0) {
|
|
registered = 1;
|
|
memset(&hints, 0, sizeof hints);
|
|
hints.ai_flags = AI_PASSIVE;
|
|
hints.ai_family = si.si_af;
|
|
hints.ai_socktype = si.si_socktype;
|
|
hints.ai_protocol = si.si_proto;
|
|
|
|
|
|
if ((aicode = getaddrinfo(NULL, port_str, &hints,
|
|
&res)) != 0) {
|
|
syslog(LOG_ERR, "cannot get local address: %s",
|
|
gai_strerror(aicode));
|
|
exit(1);
|
|
}
|
|
|
|
servaddr.buf = malloc(res->ai_addrlen);
|
|
memcpy(servaddr.buf, res->ai_addr, res->ai_addrlen);
|
|
servaddr.len = res->ai_addrlen;
|
|
|
|
rpcb_set(SM_PROG, SM_VERS, nconf, &servaddr);
|
|
|
|
xcreated++;
|
|
freeaddrinfo(res);
|
|
}
|
|
} /* end while */
|
|
}
|
|
|
|
/*
|
|
* Clear out sockets after a failure to bind one of them, so that the
|
|
* cycle of socket creation/binding can start anew.
|
|
*/
|
|
static void
|
|
clearout_service(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < sock_fdcnt; i++) {
|
|
if (sock_fd[i] >= 0) {
|
|
shutdown(sock_fd[i], SHUT_RDWR);
|
|
close(sock_fd[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage()
|
|
{
|
|
fprintf(stderr, "usage: rpc.statd [-d] [-h <bindip>] [-p <port>]\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* handle_sigchld ---------------------------------------------------------- */
|
|
/*
|
|
Purpose: Catch SIGCHLD and collect process status
|
|
Retruns: Nothing.
|
|
Notes: No special action required, other than to collect the
|
|
process status and hence allow the child to die:
|
|
we only use child processes for asynchronous transmission
|
|
of SM_NOTIFY to other systems, so it is normal for the
|
|
children to exit when they have done their work.
|
|
*/
|
|
|
|
static void handle_sigchld(int sig __unused)
|
|
{
|
|
int pid, status;
|
|
pid = wait4(-1, &status, WNOHANG, (struct rusage*)0);
|
|
if (!pid) syslog(LOG_ERR, "Phantom SIGCHLD??");
|
|
else if (status == 0)
|
|
{
|
|
if (debug) syslog(LOG_DEBUG, "Child %d exited OK", pid);
|
|
}
|
|
else syslog(LOG_ERR, "Child %d failed with status %d", pid,
|
|
WEXITSTATUS(status));
|
|
}
|
|
|
|
/*
|
|
* Out of memory, fatal
|
|
*/
|
|
void
|
|
out_of_mem()
|
|
{
|
|
|
|
syslog(LOG_ERR, "out of memory");
|
|
exit(2);
|
|
}
|