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1.1 root 1: /*
2: * Copyright (c) 1983 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted provided
6: * that: (1) source distributions retain this entire copyright notice and
7: * comment, and (2) distributions including binaries display the following
8: * acknowledgement: ``This product includes software developed by the
9: * University of California, Berkeley and its contributors'' in the
10: * documentation or other materials provided with the distribution and in
11: * all advertising materials mentioning features or use of this software.
12: * Neither the name of the University nor the names of its contributors may
13: * be used to endorse or promote products derived from this software without
14: * specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
16: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
17: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: char copyright[] =
22: "@(#) Copyright (c) 1983 The Regents of the University of California.\n\
23: All rights reserved.\n";
24: #endif /* not lint */
25:
26: #ifndef lint
27: static char sccsid[] = "@(#)rwhod.c 5.19 (Berkeley) 6/29/90";
28: #endif /* not lint */
29:
30: #include <sys/param.h>
31: #include <sys/socket.h>
32: #include <sys/stat.h>
33: #include <sys/signal.h>
34: #include <sys/ioctl.h>
35: #include <sys/file.h>
36:
37: #include <net/if.h>
38: #include <netinet/in.h>
39:
40: #include <nlist.h>
41: #include <errno.h>
42: #include <utmp.h>
43: #include <ctype.h>
44: #include <netdb.h>
45: #include <syslog.h>
46: #include <protocols/rwhod.h>
47: #include <stdio.h>
48: #include <paths.h>
49:
50: /*
51: * Alarm interval. Don't forget to change the down time check in ruptime
52: * if this is changed.
53: */
54: #define AL_INTERVAL (3 * 60)
55:
56: struct sockaddr_in sin;
57:
58: char myname[MAXHOSTNAMELEN];
59:
60: struct nlist nl[] = {
61: #define NL_BOOTTIME 0
62: { "_boottime" },
63: 0
64: };
65:
66: /*
67: * We communicate with each neighbor in
68: * a list constructed at the time we're
69: * started up. Neighbors are currently
70: * directly connected via a hardware interface.
71: */
72: struct neighbor {
73: struct neighbor *n_next;
74: char *n_name; /* interface name */
75: char *n_addr; /* who to send to */
76: int n_addrlen; /* size of address */
77: int n_flags; /* should forward?, interface flags */
78: };
79:
80: struct neighbor *neighbors;
81: struct whod mywd;
82: struct servent *sp;
83: int s, utmpf, kmemf = -1;
84:
85: #define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
86:
87: extern int errno;
88: int onalrm();
89: char *strcpy(), *malloc();
90: long lseek();
91: int getkmem();
92: struct in_addr inet_makeaddr();
93:
94: main()
95: {
96: struct sockaddr_in from;
97: struct stat st;
98: char path[64];
99: int on = 1;
100: char *cp, *index(), *strerror();
101:
102: if (getuid()) {
103: fprintf(stderr, "rwhod: not super user\n");
104: exit(1);
105: }
106: sp = getservbyname("who", "udp");
107: if (sp == 0) {
108: fprintf(stderr, "rwhod: udp/who: unknown service\n");
109: exit(1);
110: }
111: #ifndef DEBUG
112: daemon(1, 0);
113: #endif
114: if (chdir(_PATH_RWHODIR) < 0) {
115: (void)fprintf(stderr, "rwhod: %s: %s\n",
116: _PATH_RWHODIR, strerror(errno));
117: exit(1);
118: }
119: (void) signal(SIGHUP, getkmem);
120: openlog("rwhod", LOG_PID, LOG_DAEMON);
121: /*
122: * Establish host name as returned by system.
123: */
124: if (gethostname(myname, sizeof (myname) - 1) < 0) {
125: syslog(LOG_ERR, "gethostname: %m");
126: exit(1);
127: }
128: if ((cp = index(myname, '.')) != NULL)
129: *cp = '\0';
130: strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
131: utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);
132: if (utmpf < 0) {
133: syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
134: exit(1);
135: }
136: getkmem();
137: if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
138: syslog(LOG_ERR, "socket: %m");
139: exit(1);
140: }
141: if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
142: syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
143: exit(1);
144: }
145: sin.sin_family = AF_INET;
146: sin.sin_port = sp->s_port;
147: if (bind(s, &sin, sizeof (sin)) < 0) {
148: syslog(LOG_ERR, "bind: %m");
149: exit(1);
150: }
151: if (!configure(s))
152: exit(1);
153: signal(SIGALRM, onalrm);
154: onalrm();
155: for (;;) {
156: struct whod wd;
157: int cc, whod, len = sizeof (from);
158:
159: cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
160: &from, &len);
161: if (cc <= 0) {
162: if (cc < 0 && errno != EINTR)
163: syslog(LOG_WARNING, "recv: %m");
164: continue;
165: }
166: if (from.sin_port != sp->s_port) {
167: syslog(LOG_WARNING, "%d: bad from port",
168: ntohs(from.sin_port));
169: continue;
170: }
171: if (wd.wd_vers != WHODVERSION)
172: continue;
173: if (wd.wd_type != WHODTYPE_STATUS)
174: continue;
175: if (!verify(wd.wd_hostname)) {
176: syslog(LOG_WARNING, "malformed host name from %x",
177: from.sin_addr);
178: continue;
179: }
180: (void) sprintf(path, "whod.%s", wd.wd_hostname);
181: /*
182: * Rather than truncating and growing the file each time,
183: * use ftruncate if size is less than previous size.
184: */
185: whod = open(path, O_WRONLY | O_CREAT, 0644);
186: if (whod < 0) {
187: syslog(LOG_WARNING, "%s: %m", path);
188: continue;
189: }
190: #if ENDIAN != BIG_ENDIAN
191: {
192: int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
193: struct whoent *we;
194:
195: /* undo header byte swapping before writing to file */
196: wd.wd_sendtime = ntohl(wd.wd_sendtime);
197: for (i = 0; i < 3; i++)
198: wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
199: wd.wd_boottime = ntohl(wd.wd_boottime);
200: we = wd.wd_we;
201: for (i = 0; i < n; i++) {
202: we->we_idle = ntohl(we->we_idle);
203: we->we_utmp.out_time =
204: ntohl(we->we_utmp.out_time);
205: we++;
206: }
207: }
208: #endif
209: (void) time(&wd.wd_recvtime);
210: (void) write(whod, (char *)&wd, cc);
211: if (fstat(whod, &st) < 0 || st.st_size > cc)
212: ftruncate(whod, cc);
213: (void) close(whod);
214: }
215: }
216:
217: /*
218: * Check out host name for unprintables
219: * and other funnies before allowing a file
220: * to be created. Sorry, but blanks aren't allowed.
221: */
222: verify(name)
223: register char *name;
224: {
225: register int size = 0;
226:
227: while (*name) {
228: if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
229: return (0);
230: name++, size++;
231: }
232: return (size > 0);
233: }
234:
235: int utmptime;
236: int utmpent;
237: int utmpsize = 0;
238: struct utmp *utmp;
239: int alarmcount;
240:
241: onalrm()
242: {
243: register struct neighbor *np;
244: register struct whoent *we = mywd.wd_we, *wlast;
245: register int i;
246: struct stat stb;
247: int cc;
248: double avenrun[3];
249: time_t now = time((time_t *)NULL);
250: char *strerror();
251:
252: if (alarmcount % 10 == 0)
253: getkmem();
254: alarmcount++;
255: (void) fstat(utmpf, &stb);
256: if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
257: utmptime = stb.st_mtime;
258: if (stb.st_size > utmpsize) {
259: utmpsize = stb.st_size + 10 * sizeof(struct utmp);
260: if (utmp)
261: utmp = (struct utmp *)realloc(utmp, utmpsize);
262: else
263: utmp = (struct utmp *)malloc(utmpsize);
264: if (! utmp) {
265: fprintf(stderr, "rwhod: malloc failed\n");
266: utmpsize = 0;
267: goto done;
268: }
269: }
270: (void) lseek(utmpf, (long)0, L_SET);
271: cc = read(utmpf, (char *)utmp, stb.st_size);
272: if (cc < 0) {
273: fprintf(stderr, "rwhod: %s: %s\n",
274: _PATH_UTMP, strerror(errno));
275: goto done;
276: }
277: wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
278: utmpent = cc / sizeof (struct utmp);
279: for (i = 0; i < utmpent; i++)
280: if (utmp[i].ut_name[0]) {
281: bcopy(utmp[i].ut_line, we->we_utmp.out_line,
282: sizeof (utmp[i].ut_line));
283: bcopy(utmp[i].ut_name, we->we_utmp.out_name,
284: sizeof (utmp[i].ut_name));
285: we->we_utmp.out_time = htonl(utmp[i].ut_time);
286: if (we >= wlast)
287: break;
288: we++;
289: }
290: utmpent = we - mywd.wd_we;
291: }
292:
293: /*
294: * The test on utmpent looks silly---after all, if no one is
295: * logged on, why worry about efficiency?---but is useful on
296: * (e.g.) compute servers.
297: */
298: if (utmpent && chdir(_PATH_DEV)) {
299: syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
300: exit(1);
301: }
302: we = mywd.wd_we;
303: for (i = 0; i < utmpent; i++) {
304: if (stat(we->we_utmp.out_line, &stb) >= 0)
305: we->we_idle = htonl(now - stb.st_atime);
306: we++;
307: }
308: (void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
309: for (i = 0; i < 3; i++)
310: mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
311: cc = (char *)we - (char *)&mywd;
312: mywd.wd_sendtime = htonl(time(0));
313: mywd.wd_vers = WHODVERSION;
314: mywd.wd_type = WHODTYPE_STATUS;
315: for (np = neighbors; np != NULL; np = np->n_next)
316: (void) sendto(s, (char *)&mywd, cc, 0,
317: np->n_addr, np->n_addrlen);
318: if (utmpent && chdir(_PATH_RWHODIR)) {
319: syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
320: exit(1);
321: }
322: done:
323: (void) alarm(AL_INTERVAL);
324: }
325:
326: getkmem()
327: {
328: static ino_t vmunixino;
329: static time_t vmunixctime;
330: struct stat sb;
331:
332: if (stat(_PATH_UNIX, &sb) < 0) {
333: if (vmunixctime)
334: return;
335: } else {
336: if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
337: return;
338: vmunixctime = sb.st_ctime;
339: vmunixino= sb.st_ino;
340: }
341: if (kmemf >= 0)
342: (void) close(kmemf);
343: loop:
344: if (nlist(_PATH_UNIX, nl)) {
345: syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
346: sleep(300);
347: goto loop;
348: }
349: kmemf = open(_PATH_KMEM, O_RDONLY, 0);
350: if (kmemf < 0) {
351: syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
352: exit(1);
353: }
354: (void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
355: (void) read(kmemf, (char *)&mywd.wd_boottime,
356: sizeof (mywd.wd_boottime));
357: mywd.wd_boottime = htonl(mywd.wd_boottime);
358: }
359:
360: /*
361: * Figure out device configuration and select
362: * networks which deserve status information.
363: */
364: configure(s)
365: int s;
366: {
367: char buf[BUFSIZ], *cp, *cplim;
368: struct ifconf ifc;
369: struct ifreq ifreq, *ifr;
370: struct sockaddr_in *sin;
371: register struct neighbor *np;
372:
373: ifc.ifc_len = sizeof (buf);
374: ifc.ifc_buf = buf;
375: if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
376: syslog(LOG_ERR, "ioctl (get interface configuration)");
377: return (0);
378: }
379: ifr = ifc.ifc_req;
380: #ifdef AF_LINK
381: #define max(a, b) (a > b ? a : b)
382: #define size(p) max((p).sa_len, sizeof(p))
383: #else
384: #define size(p) (sizeof (p))
385: #endif
386: cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
387: for (cp = buf; cp < cplim;
388: cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
389: ifr = (struct ifreq *)cp;
390: for (np = neighbors; np != NULL; np = np->n_next)
391: if (np->n_name &&
392: strcmp(ifr->ifr_name, np->n_name) == 0)
393: break;
394: if (np != NULL)
395: continue;
396: ifreq = *ifr;
397: np = (struct neighbor *)malloc(sizeof (*np));
398: if (np == NULL)
399: continue;
400: np->n_name = malloc(strlen(ifr->ifr_name) + 1);
401: if (np->n_name == NULL) {
402: free((char *)np);
403: continue;
404: }
405: strcpy(np->n_name, ifr->ifr_name);
406: np->n_addrlen = sizeof (ifr->ifr_addr);
407: np->n_addr = malloc(np->n_addrlen);
408: if (np->n_addr == NULL) {
409: free(np->n_name);
410: free((char *)np);
411: continue;
412: }
413: bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
414: if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
415: syslog(LOG_ERR, "ioctl (get interface flags)");
416: free((char *)np);
417: continue;
418: }
419: if ((ifreq.ifr_flags & IFF_UP) == 0 ||
420: (ifreq.ifr_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0) {
421: free((char *)np);
422: continue;
423: }
424: np->n_flags = ifreq.ifr_flags;
425: if (np->n_flags & IFF_POINTOPOINT) {
426: if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
427: syslog(LOG_ERR, "ioctl (get dstaddr)");
428: free((char *)np);
429: continue;
430: }
431: /* we assume addresses are all the same size */
432: bcopy((char *)&ifreq.ifr_dstaddr,
433: np->n_addr, np->n_addrlen);
434: }
435: if (np->n_flags & IFF_BROADCAST) {
436: if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
437: syslog(LOG_ERR, "ioctl (get broadaddr)");
438: free((char *)np);
439: continue;
440: }
441: /* we assume addresses are all the same size */
442: bcopy((char *)&ifreq.ifr_broadaddr,
443: np->n_addr, np->n_addrlen);
444: }
445: /* gag, wish we could get rid of Internet dependencies */
446: sin = (struct sockaddr_in *)np->n_addr;
447: sin->sin_port = sp->s_port;
448: np->n_next = neighbors;
449: neighbors = np;
450: }
451: return (1);
452: }
453:
454: #ifdef DEBUG
455: sendto(s, buf, cc, flags, to, tolen)
456: int s;
457: char *buf;
458: int cc, flags;
459: char *to;
460: int tolen;
461: {
462: register struct whod *w = (struct whod *)buf;
463: register struct whoent *we;
464: struct sockaddr_in *sin = (struct sockaddr_in *)to;
465: char *interval();
466:
467: printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
468: printf("hostname %s %s\n", w->wd_hostname,
469: interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
470: printf("load %4.2f, %4.2f, %4.2f\n",
471: ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
472: ntohl(w->wd_loadav[2]) / 100.0);
473: cc -= WHDRSIZE;
474: for (we = w->wd_we, cc /= sizeof (struct whoent); cc > 0; cc--, we++) {
475: time_t t = ntohl(we->we_utmp.out_time);
476: printf("%-8.8s %s:%s %.12s",
477: we->we_utmp.out_name,
478: w->wd_hostname, we->we_utmp.out_line,
479: ctime(&t)+4);
480: we->we_idle = ntohl(we->we_idle) / 60;
481: if (we->we_idle) {
482: if (we->we_idle >= 100*60)
483: we->we_idle = 100*60 - 1;
484: if (we->we_idle >= 60)
485: printf(" %2d", we->we_idle / 60);
486: else
487: printf(" ");
488: printf(":%02d", we->we_idle % 60);
489: }
490: printf("\n");
491: }
492: }
493:
494: char *
495: interval(time, updown)
496: int time;
497: char *updown;
498: {
499: static char resbuf[32];
500: int days, hours, minutes;
501:
502: if (time < 0 || time > 3*30*24*60*60) {
503: (void) sprintf(resbuf, " %s ??:??", updown);
504: return (resbuf);
505: }
506: minutes = (time + 59) / 60; /* round to minutes */
507: hours = minutes / 60; minutes %= 60;
508: days = hours / 24; hours %= 24;
509: if (days)
510: (void) sprintf(resbuf, "%s %2d+%02d:%02d",
511: updown, days, hours, minutes);
512: else
513: (void) sprintf(resbuf, "%s %2d:%02d",
514: updown, hours, minutes);
515: return (resbuf);
516: }
517: #endif
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