From 862fdf11a2ede45dec0da01ed575525d79468981 Mon Sep 17 00:00:00 2001 From: rgrimes Date: Thu, 26 May 1994 05:23:31 +0000 Subject: BSD 4.4 Lite usr.sbin Sources --- usr.sbin/rwhod/rwhod.c | 539 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 539 insertions(+) create mode 100644 usr.sbin/rwhod/rwhod.c (limited to 'usr.sbin/rwhod/rwhod.c') diff --git a/usr.sbin/rwhod/rwhod.c b/usr.sbin/rwhod/rwhod.c new file mode 100644 index 0000000..75c02ff --- /dev/null +++ b/usr.sbin/rwhod/rwhod.c @@ -0,0 +1,539 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1983, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Alarm interval. Don't forget to change the down time check in ruptime + * if this is changed. + */ +#define AL_INTERVAL (3 * 60) + +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. + */ +struct neighbor { + struct neighbor *n_next; + char *n_name; /* interface name */ + struct sockaddr *n_addr; /* who to send to */ + int n_addrlen; /* size of address */ + int n_flags; /* should forward?, interface flags */ +}; + +struct neighbor *neighbors; +struct whod mywd; +struct servent *sp; +int s, utmpf; + +#define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we)) + +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 + +int +main(argc, argv) + int argc; + char argv[]; +{ + struct sockaddr_in from; + struct stat st; + char path[64]; + int on = 1; + char *cp; + struct sockaddr_in sin; + + if (getuid()) { + fprintf(stderr, "rwhod: not super user\n"); + exit(1); + } + sp = getservbyname("who", "udp"); + if (sp == NULL) { + fprintf(stderr, "rwhod: udp/who: unknown service\n"); + exit(1); + } +#ifndef DEBUG + daemon(1, 0); +#endif + if (chdir(_PATH_RWHODIR) < 0) { + (void)fprintf(stderr, "rwhod: %s: %s\n", + _PATH_RWHODIR, strerror(errno)); + exit(1); + } + (void) signal(SIGHUP, getboottime); + openlog("rwhod", LOG_PID, LOG_DAEMON); + /* + * Establish host name as returned by system. + */ + if (gethostname(myname, sizeof(myname) - 1) < 0) { + syslog(LOG_ERR, "gethostname: %m"); + exit(1); + } + 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) { + syslog(LOG_ERR, "%s: %m", _PATH_UTMP); + exit(1); + } + getboottime(0); + if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { + syslog(LOG_ERR, "socket: %m"); + exit(1); + } + if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) { + syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m"); + exit(1); + } + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin.sin_port = sp->s_port; + if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) { + syslog(LOG_ERR, "bind: %m"); + exit(1); + } + if (!configure(s)) + exit(1); + signal(SIGALRM, onalrm); + onalrm(0); + for (;;) { + struct whod wd; + int cc, whod, len = sizeof(from); + + cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0, + (struct sockaddr *)&from, &len); + if (cc <= 0) { + if (cc < 0 && errno != EINTR) + syslog(LOG_WARNING, "recv: %m"); + continue; + } + if (from.sin_port != sp->s_port) { + syslog(LOG_WARNING, "%d: bad from port", + ntohs(from.sin_port)); + continue; + } + if (wd.wd_vers != WHODVERSION) + continue; + if (wd.wd_type != WHODTYPE_STATUS) + continue; + if (!verify(wd.wd_hostname)) { + syslog(LOG_WARNING, "malformed host name from %x", + from.sin_addr); + continue; + } + (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) { + syslog(LOG_WARNING, "%s: %m", path); + continue; + } +#if ENDIAN != BIG_ENDIAN + { + int i, n = (cc - WHDRSIZE)/sizeof(struct whoent); + struct whoent *we; + + /* undo header byte swapping before writing to file */ + wd.wd_sendtime = ntohl(wd.wd_sendtime); + for (i = 0; i < 3; i++) + wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); + wd.wd_boottime = ntohl(wd.wd_boottime); + we = wd.wd_we; + for (i = 0; i < n; i++) { + we->we_idle = ntohl(we->we_idle); + we->we_utmp.out_time = + ntohl(we->we_utmp.out_time); + we++; + } + } +#endif + (void) time((time_t *)&wd.wd_recvtime); + (void) write(whod, (char *)&wd, cc); + if (fstat(whod, &st) < 0 || st.st_size > cc) + ftruncate(whod, cc); + (void) close(whod); + } +} + +/* + * Check out host name for unprintables + * 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) { + if (!isascii(*name) || !(isalnum(*name) || ispunct(*name))) + return (0); + name++, size++; + } + return (size > 0); +} + +int utmptime; +int utmpent; +int utmpsize = 0; +struct utmp *utmp; +int alarmcount; + +void +onalrm(signo) + int signo; +{ + register struct neighbor *np; + register struct whoent *we = mywd.wd_we, *wlast; + register int i; + struct stat stb; + double avenrun[3]; + time_t now; + int cc; + + now = time(NULL); + if (alarmcount % 10 == 0) + getboottime(0); + alarmcount++; + (void) fstat(utmpf, &stb); + 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) { + 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); + for (i = 0; i < utmpent; i++) + if (utmp[i].ut_name[0]) { + 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; + } + + /* + * 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++) { + 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 *)we - (char *)&mywd; + mywd.wd_sendtime = htonl(time(0)); + 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); + if (utmpent && chdir(_PATH_RWHODIR)) { + syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR); + exit(1); + } +done: + (void) alarm(AL_INTERVAL); +} + +void +getboottime(signo) + int signo; +{ + 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(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); + } +} + +/* + * Figure out device configuration and select + * networks which deserve status information. + */ +int +configure(s) + int s; +{ + 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; + + 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 || + (flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 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 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 = (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; + memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen); + memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen); + } + free(buf); + 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 -- cgit v1.1