Without the cast there is ambiguity between 0xFF and -1 (EOF). Suggested by: jilles Submitted by: Mariusz Zaborski <oshogbo@FreeBSD.org> Sponsored by: Google Summer of Code 2013
785 lines
20 KiB
C
785 lines
20 KiB
C
/*-
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* Copyright (c) 1983, 1993 The Regents of the University of California.
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* Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* 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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* 4. Neither the name of the University nor the names of its 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 THE REGENTS 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 REGENTS 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/capability.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/signal.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/procdesc.h>
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#include <sys/wait.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <protocols/rwhod.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <netdb.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <timeconv.h>
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#include <utmpx.h>
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#include <unistd.h>
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#define UNPRIV_USER "daemon"
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#define UNPRIV_GROUP "daemon"
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#define NO_MULTICAST 0 /* multicast modes */
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#define PER_INTERFACE_MULTICAST 1
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#define SCOPED_MULTICAST 2
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#define MAX_MULTICAST_SCOPE 32 /* "site-wide", by convention */
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#define INADDR_WHOD_GROUP (u_long)0xe0000103 /* 224.0.1.3 */
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/* (belongs in protocols/rwhod.h) */
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int insecure_mode;
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int quiet_mode;
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int iff_flag = IFF_POINTOPOINT;
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int multicast_mode = NO_MULTICAST;
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int multicast_scope;
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struct sockaddr_in multicast_addr =
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{ sizeof(multicast_addr), AF_INET, 0, { 0 }, { 0 } };
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/*
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* Sleep interval. Don't forget to change the down time check in ruptime
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* if this is changed.
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*/
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#define SL_INTERVAL (3 * 60)
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char myname[MAXHOSTNAMELEN];
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/*
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* We communicate with each neighbor in a list constructed at the time we're
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* started up. Neighbors are currently directly connected via a hardware
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* interface.
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*/
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struct neighbor {
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struct neighbor *n_next;
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char *n_name; /* interface name */
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struct sockaddr *n_addr; /* who to send to */
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int n_addrlen; /* size of address */
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int n_flags; /* should forward?, interface flags */
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};
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struct neighbor *neighbors;
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struct whod mywd;
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struct servent *sp;
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int s;
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int fdp;
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pid_t pid_child_receiver;
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#define WHDRSIZE (int)(sizeof(mywd) - sizeof(mywd.wd_we))
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int configure(int so);
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void getboottime(int signo __unused);
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void receiver_process(void);
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void rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo);
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void run_as(uid_t *uid, gid_t *gid);
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void quit(const char *msg);
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void sender_process(void);
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int verify(char *name, int maxlen);
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static void usage(void);
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#ifdef DEBUG
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char *interval(int time, char *updown);
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void Sendto(int s, const void *buf, size_t cc, int flags,
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const struct sockaddr *to, int tolen);
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#define sendto Sendto
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#endif
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/*
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* This version of Berkeley's rwhod has been modified to use IP multicast
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* datagrams, under control of a new command-line option:
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*
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* rwhod -m causes rwhod to use IP multicast (instead of
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* broadcast or unicast) on all interfaces that have
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* the IFF_MULTICAST flag set in their "ifnet" structs
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* (excluding the loopback interface). The multicast
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* reports are sent with a time-to-live of 1, to prevent
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* forwarding beyond the directly-connected subnet(s).
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*
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* rwhod -m <ttl> causes rwhod to send IP multicast datagrams with a
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* time-to-live of <ttl>, via a SINGLE interface rather
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* than all interfaces. <ttl> must be between 0 and
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* MAX_MULTICAST_SCOPE, defined below. Note that "-m 1"
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* is different than "-m", in that "-m 1" specifies
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* transmission on one interface only.
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*
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* When "-m" is used without a <ttl> argument, the program accepts multicast
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* rwhod reports from all multicast-capable interfaces. If a <ttl> argument
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* is given, it accepts multicast reports from only one interface, the one
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* on which reports are sent (which may be controlled via the host's routing
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* table). Regardless of the "-m" option, the program accepts broadcast or
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* unicast reports from all interfaces. Thus, this program will hear the
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* reports of old, non-multicasting rwhods, but, if multicasting is used,
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* those old rwhods won't hear the reports generated by this program.
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*
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* -- Steve Deering, Stanford University, February 1989
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*/
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int
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main(int argc, char *argv[])
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{
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int on;
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char *cp;
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struct sockaddr_in soin;
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uid_t unpriv_uid;
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gid_t unpriv_gid;
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on = 1;
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if (getuid())
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errx(1, "not super user");
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run_as(&unpriv_uid, &unpriv_gid);
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argv++;
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argc--;
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while (argc > 0 && *argv[0] == '-') {
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if (strcmp(*argv, "-m") == 0) {
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if (argc > 1 && isdigit(*(argv + 1)[0])) {
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argv++;
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argc--;
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multicast_mode = SCOPED_MULTICAST;
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multicast_scope = atoi(*argv);
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if (multicast_scope > MAX_MULTICAST_SCOPE) {
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errx(1, "ttl must not exceed %u",
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MAX_MULTICAST_SCOPE);
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}
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} else {
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multicast_mode = PER_INTERFACE_MULTICAST;
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}
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} else if (strcmp(*argv, "-i") == 0) {
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insecure_mode = 1;
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} else if (strcmp(*argv, "-l") == 0) {
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quiet_mode = 1;
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} else if (strcmp(*argv, "-p") == 0) {
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iff_flag = 0;
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} else {
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usage();
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}
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argv++;
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argc--;
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}
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if (argc > 0)
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usage();
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#ifndef DEBUG
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daemon(1, 0);
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#endif
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(void) signal(SIGHUP, getboottime);
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openlog("rwhod", LOG_PID | LOG_NDELAY, LOG_DAEMON);
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sp = getservbyname("who", "udp");
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if (sp == NULL) {
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syslog(LOG_ERR, "who/udp: unknown service");
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exit(1);
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}
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if (chdir(_PATH_RWHODIR) < 0) {
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syslog(LOG_ERR, "%s: %m", _PATH_RWHODIR);
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exit(1);
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}
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/*
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* Establish host name as returned by system.
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*/
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if (gethostname(myname, sizeof(myname) - 1) < 0) {
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syslog(LOG_ERR, "gethostname: %m");
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exit(1);
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}
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if ((cp = strchr(myname, '.')) != NULL)
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*cp = '\0';
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strlcpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname));
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getboottime(0);
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "socket: %m");
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exit(1);
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}
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if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
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syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
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exit(1);
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}
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memset(&soin, 0, sizeof(soin));
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soin.sin_len = sizeof(soin);
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soin.sin_family = AF_INET;
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soin.sin_port = sp->s_port;
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if (bind(s, (struct sockaddr *)&soin, sizeof(soin)) < 0) {
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syslog(LOG_ERR, "bind: %m");
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exit(1);
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}
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if (setgid(unpriv_gid) != 0) {
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syslog(LOG_ERR, "setgid: %m");
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exit(1);
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}
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if (setgroups(1, &unpriv_gid) != 0) { /* XXX BOGUS groups[0] = egid */
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syslog(LOG_ERR, "setgroups: %m");
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exit(1);
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}
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if (setuid(unpriv_uid) != 0) {
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syslog(LOG_ERR, "setuid: %m");
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exit(1);
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}
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if (!configure(s))
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exit(1);
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if (!quiet_mode) {
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pid_child_receiver = pdfork(&fdp, 0);
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if (pid_child_receiver == -1) {
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if (errno != ENOSYS) {
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syslog(LOG_ERR, "pdfork: %m");
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exit(1);
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} else {
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pid_child_receiver = fork();
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fdp = -1;
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}
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}
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if (pid_child_receiver == 0) {
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receiver_process();
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} else if (pid_child_receiver > 0) {
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sender_process();
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} else if (pid_child_receiver == -1) {
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syslog(LOG_ERR, "pdfork: %m");
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exit(1);
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}
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} else {
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receiver_process();
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}
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: rwhod [-i] [-p] [-l] [-m [ttl]]\n");
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exit(1);
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}
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void
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run_as(uid_t *uid, gid_t *gid)
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{
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struct passwd *pw;
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struct group *gr;
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pw = getpwnam(UNPRIV_USER);
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if (pw == NULL) {
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syslog(LOG_ERR, "getpwnam(%s): %m", UNPRIV_USER);
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exit(1);
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}
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*uid = pw->pw_uid;
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gr = getgrnam(UNPRIV_GROUP);
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if (gr == NULL) {
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syslog(LOG_ERR, "getgrnam(%s): %m", UNPRIV_GROUP);
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exit(1);
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}
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*gid = gr->gr_gid;
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}
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/*
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* Check out host name for unprintables
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* and other funnies before allowing a file
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* to be created. Sorry, but blanks aren't allowed.
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*/
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int
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verify(char *name, int maxlen)
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{
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int size;
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size = 0;
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while (*name != '\0' && size < maxlen - 1) {
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if (!isascii((unsigned char)*name) ||
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!(isalnum((unsigned char)*name) ||
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ispunct((unsigned char)*name))) {
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return (0);
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}
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name++;
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size++;
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}
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*name = '\0';
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return (size > 0);
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}
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void
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receiver_process(void)
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{
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struct sockaddr_in from;
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struct stat st;
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char path[64];
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int dirfd;
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struct whod wd;
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socklen_t len;
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int cc, whod;
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time_t t;
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len = sizeof(from);
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dirfd = open(".", O_RDONLY | O_DIRECTORY);
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if (dirfd < 0) {
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syslog(LOG_WARNING, "%s: %m", _PATH_RWHODIR);
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exit(1);
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}
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if (cap_rights_limit(dirfd, CAP_CREATE | CAP_WRITE | CAP_FTRUNCATE |
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CAP_SEEK | CAP_LOOKUP | CAP_FSTAT) < 0 && errno != ENOSYS) {
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syslog(LOG_WARNING, "cap_rights_limit: %m");
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exit(1);
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}
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if (cap_enter() < 0 && errno != ENOSYS) {
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syslog(LOG_ERR, "cap_enter: %m");
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exit(1);
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}
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for (;;) {
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cc = recvfrom(s, &wd, sizeof(wd), 0, (struct sockaddr *)&from,
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&len);
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if (cc <= 0) {
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if (cc < 0 && errno != EINTR)
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syslog(LOG_WARNING, "recv: %m");
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continue;
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}
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if (from.sin_port != sp->s_port && !insecure_mode) {
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syslog(LOG_WARNING, "%d: bad source port from %s",
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ntohs(from.sin_port), inet_ntoa(from.sin_addr));
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continue;
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}
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if (cc < WHDRSIZE) {
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syslog(LOG_WARNING, "short packet from %s",
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inet_ntoa(from.sin_addr));
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continue;
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}
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if (wd.wd_vers != WHODVERSION)
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continue;
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if (wd.wd_type != WHODTYPE_STATUS)
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continue;
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if (!verify(wd.wd_hostname, sizeof(wd.wd_hostname))) {
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syslog(LOG_WARNING, "malformed host name from %s",
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inet_ntoa(from.sin_addr));
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continue;
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}
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(void) snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname);
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/*
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* Rather than truncating and growing the file each time,
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* use ftruncate if size is less than previous size.
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*/
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whod = openat(dirfd, path, O_WRONLY | O_CREAT, 0644);
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if (whod < 0) {
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syslog(LOG_WARNING, "%s: %m", path);
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continue;
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}
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if (cap_rights_limit(whod, CAP_WRITE | CAP_FTRUNCATE |
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CAP_FSTAT) < 0 && errno != ENOSYS) {
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syslog(LOG_WARNING, "cap_rights_limit: %m");
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exit(1);
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}
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#if ENDIAN != BIG_ENDIAN
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{
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struct whoent *we;
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int i, n;
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n = (cc - WHDRSIZE) / sizeof(struct whoent);
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/* undo header byte swapping before writing to file */
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wd.wd_sendtime = ntohl(wd.wd_sendtime);
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for (i = 0; i < 3; i++)
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wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
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wd.wd_boottime = ntohl(wd.wd_boottime);
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we = wd.wd_we;
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for (i = 0; i < n; i++) {
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we->we_idle = ntohl(we->we_idle);
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we->we_utmp.out_time =
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ntohl(we->we_utmp.out_time);
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we++;
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}
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}
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#endif
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(void) time(&t);
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wd.wd_recvtime = _time_to_int(t);
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(void) write(whod, (char *)&wd, cc);
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if (fstat(whod, &st) < 0 || st.st_size > cc)
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ftruncate(whod, cc);
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(void) close(whod);
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}
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(void) close(dirfd);
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}
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void
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sender_process(void)
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{
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int sendcount;
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double avenrun[3];
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time_t now;
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int i, cc, status;
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struct utmpx *ut;
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struct stat stb;
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struct neighbor *np;
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struct whoent *we, *wend;
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sendcount = 0;
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for (;;) {
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we = mywd.wd_we;
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now = time(NULL);
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if (sendcount % 10 == 0)
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getboottime(0);
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sendcount++;
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wend = &mywd.wd_we[1024 / sizeof(struct whoent)];
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setutxent();
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while ((ut = getutxent()) != NULL && we < wend) {
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if (ut->ut_type != USER_PROCESS)
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continue;
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strncpy(we->we_utmp.out_line, ut->ut_line,
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sizeof(we->we_utmp.out_line));
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strncpy(we->we_utmp.out_name, ut->ut_user,
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sizeof(we->we_utmp.out_name));
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we->we_utmp.out_time =
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htonl(_time_to_time32(ut->ut_tv.tv_sec));
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we++;
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}
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endutxent();
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if (chdir(_PATH_DEV) < 0) {
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syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
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exit(1);
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}
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wend = we;
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for (we = mywd.wd_we; we < wend; we++) {
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if (stat(we->we_utmp.out_line, &stb) >= 0)
|
|
we->we_idle = htonl(now - stb.st_atime);
|
|
we++;
|
|
}
|
|
(void) getloadavg(avenrun,
|
|
sizeof(avenrun) / sizeof(avenrun[0]));
|
|
for (i = 0; i < 3; i++)
|
|
mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
|
|
cc = (char *)wend - (char *)&mywd;
|
|
mywd.wd_sendtime = htonl(_time_to_time32(time(NULL)));
|
|
mywd.wd_vers = WHODVERSION;
|
|
mywd.wd_type = WHODTYPE_STATUS;
|
|
if (multicast_mode == SCOPED_MULTICAST) {
|
|
(void) sendto(s, (char *)&mywd, cc, 0,
|
|
(struct sockaddr *)&multicast_addr,
|
|
sizeof(multicast_addr));
|
|
} else {
|
|
for (np = neighbors; np != NULL; np = np->n_next) {
|
|
if (multicast_mode == PER_INTERFACE_MULTICAST &&
|
|
(np->n_flags & IFF_MULTICAST) != 0) {
|
|
/*
|
|
* Select the outgoing interface for the
|
|
* multicast.
|
|
*/
|
|
if (setsockopt(s, IPPROTO_IP,
|
|
IP_MULTICAST_IF,
|
|
&(((struct sockaddr_in *)np->n_addr)->sin_addr),
|
|
sizeof(struct in_addr)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt IP_MULTICAST_IF: %m");
|
|
exit(1);
|
|
}
|
|
(void) sendto(s, (char *)&mywd, cc, 0,
|
|
(struct sockaddr *)&multicast_addr,
|
|
sizeof(multicast_addr));
|
|
} else {
|
|
(void) sendto(s, (char *)&mywd, cc, 0,
|
|
np->n_addr, np->n_addrlen);
|
|
}
|
|
}
|
|
}
|
|
if (chdir(_PATH_RWHODIR) < 0) {
|
|
syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
|
|
exit(1);
|
|
}
|
|
if (waitpid(pid_child_receiver, &status, WNOHANG) ==
|
|
pid_child_receiver) {
|
|
break;
|
|
}
|
|
sleep(SL_INTERVAL);
|
|
}
|
|
}
|
|
|
|
void
|
|
getboottime(int signo __unused)
|
|
{
|
|
int mib[2];
|
|
size_t size;
|
|
struct timeval tm;
|
|
|
|
mib[0] = CTL_KERN;
|
|
mib[1] = KERN_BOOTTIME;
|
|
size = sizeof(tm);
|
|
if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) {
|
|
syslog(LOG_ERR, "cannot get boottime: %m");
|
|
exit(1);
|
|
}
|
|
mywd.wd_boottime = htonl(_time_to_time32(tm.tv_sec));
|
|
}
|
|
|
|
void
|
|
quit(const char *msg)
|
|
{
|
|
|
|
syslog(LOG_ERR, "%s", msg);
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
|
|
{
|
|
struct sockaddr *sa;
|
|
int i;
|
|
|
|
memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
|
|
for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
|
|
if ((rtinfo->rti_addrs & (1 << i)) == 0)
|
|
continue;
|
|
sa = (struct sockaddr *)cp;
|
|
rtinfo->rti_info[i] = sa;
|
|
cp += SA_SIZE(sa);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Figure out device configuration and select
|
|
* networks which deserve status information.
|
|
*/
|
|
int
|
|
configure(int so)
|
|
{
|
|
struct neighbor *np;
|
|
struct if_msghdr *ifm;
|
|
struct ifa_msghdr *ifam;
|
|
struct sockaddr_dl *sdl;
|
|
size_t needed;
|
|
int mib[6], flags, lflags, len;
|
|
char *buf, *lim, *next;
|
|
struct rt_addrinfo info;
|
|
|
|
flags = 0;
|
|
if (multicast_mode != NO_MULTICAST) {
|
|
multicast_addr.sin_addr.s_addr = htonl(INADDR_WHOD_GROUP);
|
|
multicast_addr.sin_port = sp->s_port;
|
|
}
|
|
|
|
if (multicast_mode == SCOPED_MULTICAST) {
|
|
struct ip_mreq mreq;
|
|
unsigned char ttl;
|
|
|
|
mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
|
|
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
|
|
if (setsockopt(so, IPPROTO_IP, IP_ADD_MEMBERSHIP,
|
|
&mreq, sizeof(mreq)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt IP_ADD_MEMBERSHIP: %m");
|
|
return (0);
|
|
}
|
|
ttl = multicast_scope;
|
|
if (setsockopt(so, IPPROTO_IP, IP_MULTICAST_TTL, &ttl,
|
|
sizeof(ttl)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt IP_MULTICAST_TTL: %m");
|
|
return (0);
|
|
}
|
|
return (1);
|
|
}
|
|
|
|
mib[0] = CTL_NET;
|
|
mib[1] = PF_ROUTE;
|
|
mib[2] = 0;
|
|
mib[3] = AF_INET;
|
|
mib[4] = NET_RT_IFLIST;
|
|
mib[5] = 0;
|
|
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
|
|
quit("route-sysctl-estimate");
|
|
if ((buf = malloc(needed)) == NULL)
|
|
quit("malloc");
|
|
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
|
|
quit("actual retrieval of interface table");
|
|
lim = buf + needed;
|
|
|
|
sdl = NULL; /* XXX just to keep gcc -Wall happy */
|
|
for (next = buf; next < lim; next += ifm->ifm_msglen) {
|
|
ifm = (struct if_msghdr *)next;
|
|
if (ifm->ifm_type == RTM_IFINFO) {
|
|
sdl = (struct sockaddr_dl *)(ifm + 1);
|
|
flags = ifm->ifm_flags;
|
|
continue;
|
|
}
|
|
if ((flags & IFF_UP) == 0)
|
|
continue;
|
|
lflags = IFF_BROADCAST | iff_flag;
|
|
if (multicast_mode == PER_INTERFACE_MULTICAST)
|
|
lflags |= IFF_MULTICAST;
|
|
if ((flags & lflags) == 0)
|
|
continue;
|
|
if (ifm->ifm_type != RTM_NEWADDR)
|
|
quit("out of sync parsing NET_RT_IFLIST");
|
|
ifam = (struct ifa_msghdr *)ifm;
|
|
info.rti_addrs = ifam->ifam_addrs;
|
|
rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
|
|
&info);
|
|
/* gag, wish we could get rid of Internet dependencies */
|
|
#define dstaddr info.rti_info[RTAX_BRD]
|
|
#define ifaddr info.rti_info[RTAX_IFA]
|
|
#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr
|
|
#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port
|
|
if (dstaddr == 0 || dstaddr->sa_family != AF_INET)
|
|
continue;
|
|
PORT_SA(dstaddr) = sp->s_port;
|
|
for (np = neighbors; np != NULL; np = np->n_next) {
|
|
if (memcmp(sdl->sdl_data, np->n_name,
|
|
sdl->sdl_nlen) == 0 &&
|
|
IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr)) {
|
|
break;
|
|
}
|
|
}
|
|
if (np != NULL)
|
|
continue;
|
|
len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
|
|
np = malloc(len);
|
|
if (np == NULL)
|
|
quit("malloc of neighbor structure");
|
|
memset(np, 0, len);
|
|
np->n_flags = flags;
|
|
np->n_addr = (struct sockaddr *)(np + 1);
|
|
np->n_addrlen = dstaddr->sa_len;
|
|
np->n_name = np->n_addrlen + (char *)np->n_addr;
|
|
memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
|
|
memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);
|
|
if (multicast_mode == PER_INTERFACE_MULTICAST &&
|
|
(flags & IFF_MULTICAST) != 0 &&
|
|
(flags & IFF_LOOPBACK) == 0) {
|
|
struct ip_mreq mreq;
|
|
|
|
memcpy((char *)np->n_addr, (char *)ifaddr,
|
|
np->n_addrlen);
|
|
mreq.imr_multiaddr.s_addr = htonl(INADDR_WHOD_GROUP);
|
|
mreq.imr_interface.s_addr =
|
|
((struct sockaddr_in *)np->n_addr)->sin_addr.s_addr;
|
|
if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
|
|
&mreq, sizeof(mreq)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt IP_ADD_MEMBERSHIP: %m");
|
|
#if 0
|
|
/* Fall back to broadcast on this if. */
|
|
np->n_flags &= ~IFF_MULTICAST;
|
|
#else
|
|
free(np);
|
|
continue;
|
|
#endif
|
|
}
|
|
}
|
|
np->n_next = neighbors;
|
|
neighbors = np;
|
|
}
|
|
free(buf);
|
|
return (1);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void
|
|
Sendto(int s, const void *buf, size_t cc, int flags, const struct sockaddr *to,
|
|
int tolen)
|
|
{
|
|
struct whod *w;
|
|
struct whoent *we;
|
|
struct sockaddr_in *sin;
|
|
|
|
w = (struct whod *)buf;
|
|
sin = (struct sockaddr_in *)to;
|
|
printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr),
|
|
ntohs(sin->sin_port));
|
|
printf("hostname %s %s\n", w->wd_hostname,
|
|
interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
|
|
printf("load %4.2f, %4.2f, %4.2f\n",
|
|
ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
|
|
ntohl(w->wd_loadav[2]) / 100.0);
|
|
cc -= WHDRSIZE;
|
|
for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) {
|
|
time_t t = _time32_to_time(ntohl(we->we_utmp.out_time));
|
|
|
|
printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name,
|
|
w->wd_hostname, we->we_utmp.out_line, ctime(&t) + 4);
|
|
we->we_idle = ntohl(we->we_idle) / 60;
|
|
if (we->we_idle != 0) {
|
|
if (we->we_idle >= 100 * 60)
|
|
we->we_idle = 100 * 60 - 1;
|
|
if (we->we_idle >= 60)
|
|
printf(" %2d", we->we_idle / 60);
|
|
else
|
|
printf(" ");
|
|
printf(":%02d", we->we_idle % 60);
|
|
}
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
char *
|
|
interval(int time, char *updown)
|
|
{
|
|
static char resbuf[32];
|
|
int days, hours, minutes;
|
|
|
|
if (time < 0 || time > 3 * 30 * 24 * 60 * 60) {
|
|
(void) sprintf(resbuf, " %s ??:??", updown);
|
|
return (resbuf);
|
|
}
|
|
minutes = (time + 59) / 60; /* round to minutes */
|
|
hours = minutes / 60;
|
|
minutes %= 60;
|
|
days = hours / 24;
|
|
hours %= 24;
|
|
if (days > 0) {
|
|
(void) sprintf(resbuf, "%s %2d+%02d:%02d",
|
|
updown, days, hours, minutes);
|
|
} else {
|
|
(void) sprintf(resbuf, "%s %2d:%02d",
|
|
updown, hours, minutes);
|
|
}
|
|
return (resbuf);
|
|
}
|
|
#endif
|