add confSORT_QUEUE_BY_HOST and confBROKEN_SMTP_PEERS

[unix-history] / usr / src / usr.sbin / rwhod / rwhod.c

diff --git a/usr/src/usr.sbin/rwhod/rwhod.c b/usr/src/usr.sbin/rwhod/rwhod.c
index 258ce4e..fad8234 100644 (file)
--- a/usr/src/usr.sbin/rwhod/rwhod.c
+++ b/usr/src/usr.sbin/rwhod/rwhod.c
@@ -1,48 +1,62 @@
+/*
+ * Copyright (c) 1983, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ */
+

 #ifndef lint
 #ifndef lint

-static char sccsid[] = "@(#)rwhod.c    4.10 83/05/09";
-#endif
+static char copyright[] =
+"@(#) Copyright (c) 1983, 1993\n\
+       The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */

 
 

-#include <sys/types.h>
+#ifndef lint
+static char sccsid[] = "@(#)rwhod.c    8.1 (Berkeley) %G%";
+#endif /* not lint */
+
+#include <sys/param.h>

 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
 #include <sys/stat.h>

+#include <sys/signal.h>

 #include <sys/ioctl.h>
 #include <sys/ioctl.h>

+#include <sys/sysctl.h>

 
 #include <net/if.h>
 
 #include <net/if.h>

+#include <net/if_dl.h>
+#include <net/route.h>

 #include <netinet/in.h>
 #include <netinet/in.h>

+#include <protocols/rwhod.h>

 
 

-#include <nlist.h>
-#include <stdio.h>
-#include <signal.h>
-#include <errno.h>
-#include <utmp.h>

 #include <ctype.h>
 #include <ctype.h>

+#include <errno.h>
+#include <fcntl.h>

 #include <netdb.h>
 #include <netdb.h>

-#include <rwhod.h>
-
-struct sockaddr_in sin = { AF_INET };
-
-extern errno;
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <utmp.h>

 
 

-char   myname[32];
+/*
+ * Alarm interval. Don't forget to change the down time check in ruptime
+ * if this is changed.
+ */
+#define AL_INTERVAL (3 * 60)

 
 

-struct nlist nl[] = {
-#define        NL_AVENRUN      0
-       { "_avenrun" },
-#define        NL_BOOTTIME     1
-       { "_boottime" },
-       0
-};
+char   myname[MAXHOSTNAMELEN];

 
 /*
 
 /*

- * We communicate with each neighbor in
- * a list constructed at the time we're
- * started up.  Neighbors are currently
- * directly connected via a hardware interface.
+ * We communicate with each neighbor in a list constructed at the time we're
+ * started up.  Neighbors are currently directly connected via a hardware
+ * interface.

  */
 struct neighbor {
        struct  neighbor *n_next;
        char    *n_name;                /* interface name */
  */
 struct neighbor {
        struct  neighbor *n_next;
        char    *n_name;                /* interface name */

-       char    *n_addr;                /* who to send to */
+       struct  sockaddr *n_addr;               /* who to send to */

        int     n_addrlen;              /* size of address */
        int     n_flags;                /* should forward?, interface flags */
 };
        int     n_addrlen;              /* size of address */
        int     n_flags;                /* should forward?, interface flags */
 };


@@ -50,130 +64,126 @@ struct    neighbor {
 struct neighbor *neighbors;
 struct whod mywd;
 struct servent *sp;
 struct neighbor *neighbors;
 struct whod mywd;
 struct servent *sp;

-int    s, utmpf, kmemf = -1;
+int    s, utmpf;

 
 

-#define        WHDRSIZE        (sizeof (mywd) - sizeof (mywd.wd_we))
-#define        RWHODIR         "/usr/spool/rwho"
+#define        WHDRSIZE        (sizeof(mywd) - sizeof(mywd.wd_we))

 
 

-int    onalrm();
-char   *strcpy(), *sprintf(), *malloc();
-long   lseek();
-int    getkmem();
-struct in_addr inet_makeaddr();
+int     configure __P((int));
+void    getboottime __P((int));
+void    onalrm __P((int));
+void    quit __P((char *));
+void    rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *));
+int     verify __P((char *));
+#ifdef DEBUG
+char   *interval __P((int, char *));
+void    Sendto __P((int, char *, int, int, char *, int));
+#define         sendto Sendto
+#endif

 
 

-main()
+int
+main(argc, argv)
+       int argc;
+       char argv[];

 {
        struct sockaddr_in from;
 {
        struct sockaddr_in from;

+       struct stat st;

        char path[64];
        char path[64];

-       int addr;
-       struct hostent *hp;
+       int on = 1;
+       char *cp;
+       struct sockaddr_in sin;

 
 

+       if (getuid()) {
+               fprintf(stderr, "rwhod: not super user\n");
+               exit(1);
+       }

        sp = getservbyname("who", "udp");
        sp = getservbyname("who", "udp");

-       if (sp == 0) {
+       if (sp == NULL) {

                fprintf(stderr, "rwhod: udp/who: unknown service\n");
                exit(1);
        }
 #ifndef DEBUG
                fprintf(stderr, "rwhod: udp/who: unknown service\n");
                exit(1);
        }
 #ifndef DEBUG

-       if (fork())
-               exit(0);
-       { int s;
-         for (s = 0; s < 10; s++)
-               (void) close(s);
-         (void) open("/", 0);
-         (void) dup2(0, 1);
-         (void) dup2(0, 2);
-         s = open("/dev/tty", 2);
-         if (s >= 0) {
-               ioctl(s, TIOCNOTTY, 0);
-               (void) close(s);
-         }
-       }
+       daemon(1, 0);

 #endif
 #endif

-       (void) chdir("/dev");
-       (void) signal(SIGHUP, getkmem);
-       if (getuid()) {
-               fprintf(stderr, "rwhod: not super user\n");
+       if (chdir(_PATH_RWHODIR) < 0) {
+               (void)fprintf(stderr, "rwhod: %s: %s\n",
+                   _PATH_RWHODIR, strerror(errno));

                exit(1);
        }
                exit(1);
        }

+       (void) signal(SIGHUP, getboottime);
+       openlog("rwhod", LOG_PID, LOG_DAEMON);

        /*
         * Establish host name as returned by system.
         */
        /*
         * Establish host name as returned by system.
         */

-       if (gethostname(myname, sizeof (myname) - 1) < 0) {
-               perror("gethostname");
+       if (gethostname(myname, sizeof(myname) - 1) < 0) {
+               syslog(LOG_ERR, "gethostname: %m");

                exit(1);
        }
                exit(1);
        }

-       strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
-       utmpf = open("/etc/utmp", 0);
+       if ((cp = index(myname, '.')) != NULL)
+               *cp = '\0';
+       strncpy(mywd.wd_hostname, myname, sizeof(myname) - 1);
+       utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);

        if (utmpf < 0) {
        if (utmpf < 0) {

-               (void) close(creat("/etc/utmp", 0644));
-               utmpf = open("/etc/utmp", 0);
-       }
-       if (utmpf < 0) {
-               perror("rwhod: /etc/utmp");
+               syslog(LOG_ERR, "%s: %m", _PATH_UTMP);

                exit(1);
        }
                exit(1);
        }

-       getkmem();
-       if ((s = socket(AF_INET, SOCK_DGRAM, 0, 0)) < 0) {
-               perror("rwhod: socket");
+       getboottime(0);
+       if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+               syslog(LOG_ERR, "socket: %m");

                exit(1);
        }
                exit(1);
        }

-       hp = gethostbyname(myname);
-       if (hp == NULL) {
-               fprintf(stderr, "%s: don't know my own name\n", myname);
+       if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
+               syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");

                exit(1);
        }
                exit(1);
        }

-       sin.sin_family = hp->h_addrtype;
+       memset(&sin, 0, sizeof(sin));
+       sin.sin_family = AF_INET;

        sin.sin_port = sp->s_port;
        sin.sin_port = sp->s_port;

-       if (bind(s, &sin, sizeof (sin), 0) < 0) {
-               perror("rwhod: bind");
+       if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
+               syslog(LOG_ERR, "bind: %m");

                exit(1);
        }
        if (!configure(s))
                exit(1);
                exit(1);
        }
        if (!configure(s))
                exit(1);

-       sigset(SIGALRM, onalrm);
-       onalrm();
+       signal(SIGALRM, onalrm);
+       onalrm(0);

        for (;;) {
                struct whod wd;
        for (;;) {
                struct whod wd;

-               int cc, whod, len = sizeof (from);
+               int cc, whod, len = sizeof(from);

 
 

-               cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
-                       &from, &len);
+               cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0,
+                       (struct sockaddr *)&from, &len);

                if (cc <= 0) {
                        if (cc < 0 && errno != EINTR)
                if (cc <= 0) {
                        if (cc < 0 && errno != EINTR)

-                               perror("rwhod: recv");
+                               syslog(LOG_WARNING, "recv: %m");

                        continue;
                }
                if (from.sin_port != sp->s_port) {
                        continue;
                }
                if (from.sin_port != sp->s_port) {

-                       fprintf(stderr, "rwhod: %d: bad from port\n",
+                       syslog(LOG_WARNING, "%d: bad from port",

                                ntohs(from.sin_port));
                        continue;
                }
                                ntohs(from.sin_port));
                        continue;
                }

-#ifdef notdef
-               if (gethostbyname(wd.wd_hostname) == 0) {
-                       fprintf(stderr, "rwhod: %s: unknown host\n",
-                               wd.wd_hostname);
-                       continue;
-               }
-#endif

                if (wd.wd_vers != WHODVERSION)
                        continue;
                if (wd.wd_type != WHODTYPE_STATUS)
                        continue;
                if (!verify(wd.wd_hostname)) {
                if (wd.wd_vers != WHODVERSION)
                        continue;
                if (wd.wd_type != WHODTYPE_STATUS)
                        continue;
                if (!verify(wd.wd_hostname)) {

-                       fprintf(stderr, "rwhod: malformed host name from %x\n",
+                       syslog(LOG_WARNING, "malformed host name from %x",

                                from.sin_addr);
                        continue;
                }
                                from.sin_addr);
                        continue;
                }

-               (void) sprintf(path, "%s/whod.%s", RWHODIR, wd.wd_hostname);
-               whod = creat(path, 0666);
+               (void) sprintf(path, "whod.%s", wd.wd_hostname);
+               /*
+                * Rather than truncating and growing the file each time,
+                * use ftruncate if size is less than previous size.
+                */
+               whod = open(path, O_WRONLY | O_CREAT, 0644);

                if (whod < 0) {
                if (whod < 0) {

-                       fprintf(stderr, "rwhod: ");
-                       perror(path);
+                       syslog(LOG_WARNING, "%s: %m", path);

                        continue;
                }
                        continue;
                }

-#if vax || pdp11
+#if ENDIAN != BIG_ENDIAN

                {
                {

-                       int i, n = (cc - WHDRSIZE)/sizeof(struct utmp);
+                       int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);

                        struct whoent *we;
 
                        /* undo header byte swapping before writing to file */
                        struct whoent *we;
 
                        /* undo header byte swapping before writing to file */


@@ -184,13 +194,16 @@ main()
                        we = wd.wd_we;
                        for (i = 0; i < n; i++) {
                                we->we_idle = ntohl(we->we_idle);
                        we = wd.wd_we;
                        for (i = 0; i < n; i++) {
                                we->we_idle = ntohl(we->we_idle);

-                               we->we_utmp.ut_time = ntohl(we->we_utmp.ut_time);
+                               we->we_utmp.out_time =
+                                   ntohl(we->we_utmp.out_time);

                                we++;
                        }
                }
 #endif
                                we++;
                        }
                }
 #endif

-               (void) time(&wd.wd_recvtime);
+               (void) time((time_t *)&wd.wd_recvtime);

                (void) write(whod, (char *)&wd, cc);
                (void) write(whod, (char *)&wd, cc);

+               if (fstat(whod, &st) < 0 || st.st_size > cc)
+                       ftruncate(whod, cc);

                (void) close(whod);
        }
 }
                (void) close(whod);
        }
 }


@@ -200,13 +213,14 @@ main()
  * and other funnies before allowing a file
  * to be created.  Sorry, but blanks aren't allowed.
  */
  * and other funnies before allowing a file
  * to be created.  Sorry, but blanks aren't allowed.
  */

+int

 verify(name)
        register char *name;
 {
        register int size = 0;
 
        while (*name) {
 verify(name)
        register char *name;
 {
        register int size = 0;
 
        while (*name) {

-               if (!isascii(*name) || !isalnum(*name))
+               if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))

                        return (0);
                name++, size++;
        }
                        return (0);
                name++, size++;
        }


@@ -215,178 +229,285 @@ verify(name)
 
 int    utmptime;
 int    utmpent;
 
 int    utmptime;
 int    utmpent;

-struct utmp utmp[100];
+int    utmpsize = 0;
+struct utmp *utmp;

 int    alarmcount;
 
 int    alarmcount;
 

-onalrm()
+void
+onalrm(signo)
+       int signo;

 {
 {

+       register struct neighbor *np;
+       register struct whoent *we = mywd.wd_we, *wlast;

        register int i;
        struct stat stb;
        register int i;
        struct stat stb;

-       register struct whoent *we = mywd.wd_we, *wlast;
-       int cc;

        double avenrun[3];
        double avenrun[3];

-       time_t now = time(0);
-       register struct neighbor *np;
+       time_t now;
+       int cc;

 
 

+       now = time(NULL);

        if (alarmcount % 10 == 0)
        if (alarmcount % 10 == 0)

-               getkmem();
+               getboottime(0);

        alarmcount++;
        (void) fstat(utmpf, &stb);
        alarmcount++;
        (void) fstat(utmpf, &stb);

-       if (stb.st_mtime != utmptime) {
-               (void) lseek(utmpf, (long)0, 0);
-               cc = read(utmpf, (char *)utmp, sizeof (utmp));
+       if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
+               utmptime = stb.st_mtime;
+               if (stb.st_size > utmpsize) {
+                       utmpsize = stb.st_size + 10 * sizeof(struct utmp);
+                       if (utmp)
+                               utmp = (struct utmp *)realloc(utmp, utmpsize);
+                       else
+                               utmp = (struct utmp *)malloc(utmpsize);
+                       if (! utmp) {
+                               fprintf(stderr, "rwhod: malloc failed\n");
+                               utmpsize = 0;
+                               goto done;
+                       }
+               }
+               (void) lseek(utmpf, (off_t)0, L_SET);
+               cc = read(utmpf, (char *)utmp, stb.st_size);

                if (cc < 0) {
                if (cc < 0) {

-                       perror("/etc/utmp");
-                       return;
+                       fprintf(stderr, "rwhod: %s: %s\n",
+                           _PATH_UTMP, strerror(errno));
+                       goto done;

                }
                }

-               wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
-               utmpent = cc / sizeof (struct utmp);
+               wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1];
+               utmpent = cc / sizeof(struct utmp);

                for (i = 0; i < utmpent; i++)
                        if (utmp[i].ut_name[0]) {
                for (i = 0; i < utmpent; i++)
                        if (utmp[i].ut_name[0]) {

-                               we->we_utmp = utmp[i];
+                               memcpy(we->we_utmp.out_line, utmp[i].ut_line,
+                                  sizeof(utmp[i].ut_line));
+                               memcpy(we->we_utmp.out_name, utmp[i].ut_name,
+                                  sizeof(utmp[i].ut_name));
+                               we->we_utmp.out_time = htonl(utmp[i].ut_time);

                                if (we >= wlast)
                                        break;
                                we++;
                        }
                utmpent = we - mywd.wd_we;
        }
                                if (we >= wlast)
                                        break;
                                we++;
                        }
                utmpent = we - mywd.wd_we;
        }

+
+       /*
+        * The test on utmpent looks silly---after all, if no one is
+        * logged on, why worry about efficiency?---but is useful on
+        * (e.g.) compute servers.
+        */
+       if (utmpent && chdir(_PATH_DEV)) {
+               syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
+               exit(1);
+       }

        we = mywd.wd_we;
        for (i = 0; i < utmpent; i++) {
        we = mywd.wd_we;
        for (i = 0; i < utmpent; i++) {

-               if (stat(we->we_utmp.ut_line, &stb) >= 0)
-                       we->we_idle = now - stb.st_atime;
+               if (stat(we->we_utmp.out_line, &stb) >= 0)
+                       we->we_idle = htonl(now - stb.st_atime);

                we++;
        }
                we++;
        }

-       (void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, 0);
-       (void) read(kmemf, (char *)avenrun, sizeof (avenrun));
+       (void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));

        for (i = 0; i < 3; i++)
        for (i = 0; i < 3; i++)

-               mywd.wd_loadav[i] = avenrun[i] * 100;
+               mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));

        cc = (char *)we - (char *)&mywd;
        cc = (char *)we - (char *)&mywd;

-       (void) time(&mywd.wd_sendtime);
-#if vax || pdp11
-       mywd.wd_sendtime = htonl(mywd.wd_sendtime);
-       for (i = 0; i < 3; i++)
-               mywd.wd_loadav[i] = htonl(mywd.wd_loadav[i]);
-       mywd.wd_boottime = htonl(mywd.wd_boottime);
-       we = mywd.wd_we;
-       for (i = 0; i < utmpent; i++) {
-               we->we_idle = htonl(we->we_idle);
-               we->we_utmp.ut_time = htonl(we->we_utmp.ut_time);
-               we++;
-       }
-#endif
+       mywd.wd_sendtime = htonl(time(0));

        mywd.wd_vers = WHODVERSION;
        mywd.wd_type = WHODTYPE_STATUS;
        for (np = neighbors; np != NULL; np = np->n_next)
        mywd.wd_vers = WHODVERSION;
        mywd.wd_type = WHODTYPE_STATUS;
        for (np = neighbors; np != NULL; np = np->n_next)

-               (void) sendto(s, (char *)&mywd, cc, 0,
-                       np->n_addr, np->n_addrlen);
-       (void) alarm(60);
+               (void)sendto(s, (char *)&mywd, cc, 0,
+                               np->n_addr, np->n_addrlen);
+       if (utmpent && chdir(_PATH_RWHODIR)) {
+               syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
+               exit(1);
+       }
+done:
+       (void) alarm(AL_INTERVAL);

 }
 
 }
 

-getkmem()
+void
+getboottime(signo)
+       int signo;

 {
 {

-       struct nlist *nlp;
-
-       signal(SIGHUP, getkmem);
-       if (kmemf >= 0)
-               (void) close(kmemf);
-loop:
-       for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) {
-               nlp->n_value = 0;
-               nlp->n_type = 0;
-       }
-       nlist("/vmunix", nl);
-       if (nl[0].n_value == 0) {
-               fprintf(stderr, "/vmunix namelist botch\n");
-               sleep(300);
-               goto loop;
+       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);

        }
        }

-       kmemf = open("/dev/kmem", 0);
-       if (kmemf < 0) {
-               perror("/dev/kmem");
-               sleep(300);
-               goto loop;
+       mywd.wd_boottime = htonl(tm.tv_sec);
+}
+
+void
+quit(msg)
+       char *msg;
+{
+       syslog(LOG_ERR, msg);
+       exit(1);
+}
+
+#define ROUNDUP(a) \
+       ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
+
+void
+rt_xaddrs(cp, cplim, rtinfo)
+       register caddr_t cp, cplim;
+       register struct rt_addrinfo *rtinfo;
+{
+       register struct sockaddr *sa;
+       register 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;
+               rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
+               ADVANCE(cp, sa);

        }
        }

-       (void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, 0);
-       (void) read(kmemf, (char *)&mywd.wd_boottime, sizeof (mywd.wd_boottime));

 }
 
 /*
  * Figure out device configuration and select
  * networks which deserve status information.
  */
 }
 
 /*
  * Figure out device configuration and select
  * networks which deserve status information.
  */

+int

 configure(s)
        int s;
 {
 configure(s)
        int s;
 {

-       char buf[BUFSIZ];
-       struct ifconf ifc;
-       struct ifreq ifreq, *ifr;
-       int n;
-       struct sockaddr_in *sin;

        register struct neighbor *np;
        register struct neighbor *np;

+       register struct if_msghdr *ifm;
+       register struct ifa_msghdr *ifam;
+       struct sockaddr_dl *sdl;
+       size_t needed;
+       int mib[6], flags = 0, len;
+       char *buf, *lim, *next;
+       struct rt_addrinfo info;

 
 

-       ifc.ifc_len = sizeof (buf);
-       ifc.ifc_buf = buf;
-       if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
-               perror("rwhod: ioctl (get interface configuration)");
-               return (0);
-       }
-       ifr = ifc.ifc_req;
-       for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
-               for (np = neighbors; np != NULL; np = np->n_next)
-                       if (np->n_name &&
-                           strcmp(ifr->ifr_name, np->n_name) == 0)
-                               break;
-               if (np != NULL)
-                       continue;
-               ifreq = *ifr;
-               np = (struct neighbor *)malloc(sizeof (*np));
-               if (np == NULL)
-                       continue;
-               np->n_name = malloc(strlen(ifr->ifr_name) + 1);
-               if (np->n_name == NULL) {
-                       free((char *)np);
+       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;
                }
                        continue;
                }

-               strcpy(np->n_name, ifr->ifr_name);
-               np->n_addrlen = sizeof (ifr->ifr_addr);
-               np->n_addr = malloc(np->n_addrlen);
-               if (np->n_addr == NULL) {
-                       free(np->n_name);
-                       free((char *)np);
+               if ((flags & IFF_UP) == 0 ||
+                   (flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0)

                        continue;
                        continue;

-               }
-               bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
-               if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
-                       perror("rwhod: ioctl (get interface flags)");
-                       free((char *)np);
+               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 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;
                        continue;

-               }
-               if ((ifreq.ifr_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0) {
-                       free((char *)np);
+               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;
                        continue;

-               }
-               np->n_flags = ifreq.ifr_flags;
-               if (np->n_flags & IFF_POINTOPOINT) {
-                       if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
-                               perror("rwhod: ioctl (get dstaddr)");
-                               free((char *)np);
-                               continue;
-                       }
-                       /* we assume addresses are all the same size */
-                       bcopy((char *)&ifreq.ifr_dstaddr,
-                         np->n_addr, np->n_addrlen);
-               }
-               if (np->n_flags & IFF_BROADCAST) {
-                       /* we assume addresses are all the same size */
-                       sin = (struct sockaddr_in *)np->n_addr;
-                       sin->sin_addr =
-                         inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY);
-               }
-               /* gag, wish we could get rid of Internet dependencies */
-               sin = (struct sockaddr_in *)np->n_addr;
-               sin->sin_port = sp->s_port;
+               len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
+               np = (struct neighbor *)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;

                np->n_next = neighbors;
                neighbors = np;
                np->n_next = neighbors;
                neighbors = np;

+               memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
+               memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);

        }
        }

+       free(buf);

        return (1);
 }
        return (1);
 }

+
+#ifdef DEBUG
+void
+Sendto(s, buf, cc, flags, to, tolen)
+       int s;
+       char *buf;
+       int cc, flags;
+       char *to;
+       int tolen;
+{
+       register struct whod *w = (struct whod *)buf;
+       register struct whoent *we;
+       struct sockaddr_in *sin = (struct sockaddr_in *)to;
+
+       printf("sendto %x.%d\n", ntohl(sin->sin_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 = 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) {
+                       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(time, updown)
+       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)
+               (void) sprintf(resbuf, "%s %2d+%02d:%02d",
+                   updown, days, hours, minutes);
+       else
+               (void) sprintf(resbuf, "%s    %2d:%02d",
+                   updown, hours, minutes);
+       return (resbuf);
+}
+#endif