Commit | Line | Data |
---|---|---|
52b4fb0c | 1 | #ifndef lint |
aaddf8a1 | 2 | static char sccsid[] = "@(#)rwhod.c 4.10 83/05/09"; |
52b4fb0c BJ |
3 | #endif |
4 | ||
52b4fb0c | 5 | #include <sys/types.h> |
52b4fb0c | 6 | #include <sys/socket.h> |
52b4fb0c | 7 | #include <sys/stat.h> |
52b4fb0c | 8 | #include <sys/ioctl.h> |
de3b21e8 | 9 | |
7af17b3e | 10 | #include <net/if.h> |
de3b21e8 SL |
11 | #include <netinet/in.h> |
12 | ||
13 | #include <nlist.h> | |
14 | #include <stdio.h> | |
15 | #include <signal.h> | |
16 | #include <errno.h> | |
17 | #include <utmp.h> | |
a0f59ac1 SL |
18 | #include <ctype.h> |
19 | #include <netdb.h> | |
7af17b3e | 20 | #include <rwhod.h> |
de3b21e8 | 21 | |
a0f59ac1 | 22 | struct sockaddr_in sin = { AF_INET }; |
52b4fb0c BJ |
23 | |
24 | extern errno; | |
25 | ||
7af17b3e | 26 | char myname[32]; |
52b4fb0c BJ |
27 | |
28 | struct nlist nl[] = { | |
29 | #define NL_AVENRUN 0 | |
30 | { "_avenrun" }, | |
de3b21e8 SL |
31 | #define NL_BOOTTIME 1 |
32 | { "_boottime" }, | |
52b4fb0c BJ |
33 | 0 |
34 | }; | |
35 | ||
7af17b3e SL |
36 | /* |
37 | * We communicate with each neighbor in | |
38 | * a list constructed at the time we're | |
39 | * started up. Neighbors are currently | |
40 | * directly connected via a hardware interface. | |
41 | */ | |
42 | struct neighbor { | |
43 | struct neighbor *n_next; | |
44 | char *n_name; /* interface name */ | |
45 | char *n_addr; /* who to send to */ | |
46 | int n_addrlen; /* size of address */ | |
47 | int n_flags; /* should forward?, interface flags */ | |
48 | }; | |
49 | ||
50 | struct neighbor *neighbors; | |
52b4fb0c | 51 | struct whod mywd; |
7af17b3e | 52 | struct servent *sp; |
52b4fb0c BJ |
53 | int s, utmpf, kmemf = -1; |
54 | ||
7af17b3e SL |
55 | #define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we)) |
56 | #define RWHODIR "/usr/spool/rwho" | |
fea387f0 | 57 | |
52b4fb0c | 58 | int onalrm(); |
7af17b3e | 59 | char *strcpy(), *sprintf(), *malloc(); |
52b4fb0c BJ |
60 | long lseek(); |
61 | int getkmem(); | |
7af17b3e | 62 | struct in_addr inet_makeaddr(); |
52b4fb0c BJ |
63 | |
64 | main() | |
65 | { | |
66 | struct sockaddr_in from; | |
67 | char path[64]; | |
68 | int addr; | |
7af17b3e | 69 | struct hostent *hp; |
52b4fb0c | 70 | |
a0f59ac1 SL |
71 | sp = getservbyname("who", "udp"); |
72 | if (sp == 0) { | |
73 | fprintf(stderr, "rwhod: udp/who: unknown service\n"); | |
74 | exit(1); | |
75 | } | |
52b4fb0c BJ |
76 | #ifndef DEBUG |
77 | if (fork()) | |
78 | exit(0); | |
79 | { int s; | |
80 | for (s = 0; s < 10; s++) | |
81 | (void) close(s); | |
82 | (void) open("/", 0); | |
83 | (void) dup2(0, 1); | |
84 | (void) dup2(0, 2); | |
85 | s = open("/dev/tty", 2); | |
86 | if (s >= 0) { | |
87 | ioctl(s, TIOCNOTTY, 0); | |
88 | (void) close(s); | |
89 | } | |
90 | } | |
91 | #endif | |
92 | (void) chdir("/dev"); | |
93 | (void) signal(SIGHUP, getkmem); | |
94 | if (getuid()) { | |
a0f59ac1 | 95 | fprintf(stderr, "rwhod: not super user\n"); |
52b4fb0c BJ |
96 | exit(1); |
97 | } | |
7af17b3e SL |
98 | /* |
99 | * Establish host name as returned by system. | |
100 | */ | |
101 | if (gethostname(myname, sizeof (myname) - 1) < 0) { | |
102 | perror("gethostname"); | |
52b4fb0c BJ |
103 | exit(1); |
104 | } | |
7af17b3e | 105 | strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1); |
52b4fb0c BJ |
106 | utmpf = open("/etc/utmp", 0); |
107 | if (utmpf < 0) { | |
108 | (void) close(creat("/etc/utmp", 0644)); | |
109 | utmpf = open("/etc/utmp", 0); | |
110 | } | |
111 | if (utmpf < 0) { | |
a0f59ac1 | 112 | perror("rwhod: /etc/utmp"); |
52b4fb0c BJ |
113 | exit(1); |
114 | } | |
115 | getkmem(); | |
85b11450 | 116 | if ((s = socket(AF_INET, SOCK_DGRAM, 0, 0)) < 0) { |
a0f59ac1 | 117 | perror("rwhod: socket"); |
de3b21e8 SL |
118 | exit(1); |
119 | } | |
7af17b3e SL |
120 | hp = gethostbyname(myname); |
121 | if (hp == NULL) { | |
122 | fprintf(stderr, "%s: don't know my own name\n", myname); | |
123 | exit(1); | |
124 | } | |
125 | sin.sin_family = hp->h_addrtype; | |
126 | sin.sin_port = sp->s_port; | |
de3b21e8 SL |
127 | if (bind(s, &sin, sizeof (sin), 0) < 0) { |
128 | perror("rwhod: bind"); | |
129 | exit(1); | |
52b4fb0c | 130 | } |
7af17b3e SL |
131 | if (!configure(s)) |
132 | exit(1); | |
52b4fb0c BJ |
133 | sigset(SIGALRM, onalrm); |
134 | onalrm(); | |
135 | for (;;) { | |
136 | struct whod wd; | |
7af17b3e | 137 | int cc, whod, len = sizeof (from); |
52b4fb0c | 138 | |
7af17b3e SL |
139 | cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0, |
140 | &from, &len); | |
52b4fb0c BJ |
141 | if (cc <= 0) { |
142 | if (cc < 0 && errno != EINTR) | |
de3b21e8 | 143 | perror("rwhod: recv"); |
52b4fb0c BJ |
144 | continue; |
145 | } | |
a0f59ac1 SL |
146 | if (from.sin_port != sp->s_port) { |
147 | fprintf(stderr, "rwhod: %d: bad from port\n", | |
148 | ntohs(from.sin_port)); | |
52b4fb0c BJ |
149 | continue; |
150 | } | |
a0f59ac1 SL |
151 | #ifdef notdef |
152 | if (gethostbyname(wd.wd_hostname) == 0) { | |
153 | fprintf(stderr, "rwhod: %s: unknown host\n", | |
154 | wd.wd_hostname); | |
155 | continue; | |
156 | } | |
157 | #endif | |
aaddf8a1 SL |
158 | if (wd.wd_vers != WHODVERSION) |
159 | continue; | |
7af17b3e SL |
160 | if (wd.wd_type != WHODTYPE_STATUS) |
161 | continue; | |
a0f59ac1 SL |
162 | if (!verify(wd.wd_hostname)) { |
163 | fprintf(stderr, "rwhod: malformed host name from %x\n", | |
164 | from.sin_addr); | |
52b4fb0c BJ |
165 | continue; |
166 | } | |
a82aa56a | 167 | (void) sprintf(path, "%s/whod.%s", RWHODIR, wd.wd_hostname); |
52b4fb0c BJ |
168 | whod = creat(path, 0666); |
169 | if (whod < 0) { | |
a0f59ac1 SL |
170 | fprintf(stderr, "rwhod: "); |
171 | perror(path); | |
52b4fb0c BJ |
172 | continue; |
173 | } | |
fea387f0 SL |
174 | #if vax || pdp11 |
175 | { | |
176 | int i, n = (cc - WHDRSIZE)/sizeof(struct utmp); | |
177 | struct whoent *we; | |
178 | ||
179 | /* undo header byte swapping before writing to file */ | |
180 | wd.wd_sendtime = ntohl(wd.wd_sendtime); | |
181 | for (i = 0; i < 3; i++) | |
182 | wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]); | |
183 | wd.wd_boottime = ntohl(wd.wd_boottime); | |
184 | we = wd.wd_we; | |
185 | for (i = 0; i < n; i++) { | |
186 | we->we_idle = ntohl(we->we_idle); | |
187 | we->we_utmp.ut_time = ntohl(we->we_utmp.ut_time); | |
188 | we++; | |
189 | } | |
190 | } | |
191 | #endif | |
52b4fb0c BJ |
192 | (void) time(&wd.wd_recvtime); |
193 | (void) write(whod, (char *)&wd, cc); | |
194 | (void) close(whod); | |
195 | } | |
196 | } | |
197 | ||
a0f59ac1 SL |
198 | /* |
199 | * Check out host name for unprintables | |
200 | * and other funnies before allowing a file | |
201 | * to be created. Sorry, but blanks aren't allowed. | |
202 | */ | |
203 | verify(name) | |
204 | register char *name; | |
205 | { | |
206 | register int size = 0; | |
207 | ||
208 | while (*name) { | |
209 | if (!isascii(*name) || !isalnum(*name)) | |
210 | return (0); | |
211 | name++, size++; | |
212 | } | |
213 | return (size > 0); | |
214 | } | |
215 | ||
52b4fb0c BJ |
216 | int utmptime; |
217 | int utmpent; | |
76886f32 | 218 | struct utmp utmp[100]; |
52b4fb0c BJ |
219 | int alarmcount; |
220 | ||
221 | onalrm() | |
222 | { | |
223 | register int i; | |
224 | struct stat stb; | |
76886f32 | 225 | register struct whoent *we = mywd.wd_we, *wlast; |
52b4fb0c BJ |
226 | int cc; |
227 | double avenrun[3]; | |
228 | time_t now = time(0); | |
7af17b3e | 229 | register struct neighbor *np; |
52b4fb0c BJ |
230 | |
231 | if (alarmcount % 10 == 0) | |
232 | getkmem(); | |
233 | alarmcount++; | |
234 | (void) fstat(utmpf, &stb); | |
235 | if (stb.st_mtime != utmptime) { | |
236 | (void) lseek(utmpf, (long)0, 0); | |
237 | cc = read(utmpf, (char *)utmp, sizeof (utmp)); | |
238 | if (cc < 0) { | |
239 | perror("/etc/utmp"); | |
240 | return; | |
241 | } | |
7af17b3e | 242 | wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1]; |
52b4fb0c BJ |
243 | utmpent = cc / sizeof (struct utmp); |
244 | for (i = 0; i < utmpent; i++) | |
245 | if (utmp[i].ut_name[0]) { | |
246 | we->we_utmp = utmp[i]; | |
76886f32 SL |
247 | if (we >= wlast) |
248 | break; | |
52b4fb0c BJ |
249 | we++; |
250 | } | |
251 | utmpent = we - mywd.wd_we; | |
252 | } | |
253 | we = mywd.wd_we; | |
254 | for (i = 0; i < utmpent; i++) { | |
255 | if (stat(we->we_utmp.ut_line, &stb) >= 0) | |
256 | we->we_idle = now - stb.st_atime; | |
257 | we++; | |
258 | } | |
259 | (void) lseek(kmemf, (long)nl[NL_AVENRUN].n_value, 0); | |
260 | (void) read(kmemf, (char *)avenrun, sizeof (avenrun)); | |
261 | for (i = 0; i < 3; i++) | |
262 | mywd.wd_loadav[i] = avenrun[i] * 100; | |
263 | cc = (char *)we - (char *)&mywd; | |
264 | (void) time(&mywd.wd_sendtime); | |
fea387f0 SL |
265 | #if vax || pdp11 |
266 | mywd.wd_sendtime = htonl(mywd.wd_sendtime); | |
267 | for (i = 0; i < 3; i++) | |
268 | mywd.wd_loadav[i] = htonl(mywd.wd_loadav[i]); | |
269 | mywd.wd_boottime = htonl(mywd.wd_boottime); | |
270 | we = mywd.wd_we; | |
271 | for (i = 0; i < utmpent; i++) { | |
272 | we->we_idle = htonl(we->we_idle); | |
273 | we->we_utmp.ut_time = htonl(we->we_utmp.ut_time); | |
274 | we++; | |
275 | } | |
276 | #endif | |
7af17b3e SL |
277 | mywd.wd_vers = WHODVERSION; |
278 | mywd.wd_type = WHODTYPE_STATUS; | |
279 | for (np = neighbors; np != NULL; np = np->n_next) | |
280 | (void) sendto(s, (char *)&mywd, cc, 0, | |
281 | np->n_addr, np->n_addrlen); | |
52b4fb0c BJ |
282 | (void) alarm(60); |
283 | } | |
284 | ||
285 | getkmem() | |
286 | { | |
287 | struct nlist *nlp; | |
288 | ||
289 | signal(SIGHUP, getkmem); | |
290 | if (kmemf >= 0) | |
291 | (void) close(kmemf); | |
292 | loop: | |
293 | for (nlp = &nl[sizeof (nl) / sizeof (nl[0])]; --nlp >= nl; ) { | |
294 | nlp->n_value = 0; | |
295 | nlp->n_type = 0; | |
296 | } | |
297 | nlist("/vmunix", nl); | |
298 | if (nl[0].n_value == 0) { | |
299 | fprintf(stderr, "/vmunix namelist botch\n"); | |
300 | sleep(300); | |
301 | goto loop; | |
302 | } | |
303 | kmemf = open("/dev/kmem", 0); | |
304 | if (kmemf < 0) { | |
305 | perror("/dev/kmem"); | |
306 | sleep(300); | |
307 | goto loop; | |
308 | } | |
de3b21e8 SL |
309 | (void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, 0); |
310 | (void) read(kmemf, (char *)&mywd.wd_boottime, sizeof (mywd.wd_boottime)); | |
52b4fb0c | 311 | } |
7af17b3e SL |
312 | |
313 | /* | |
314 | * Figure out device configuration and select | |
315 | * networks which deserve status information. | |
316 | */ | |
317 | configure(s) | |
318 | int s; | |
319 | { | |
320 | char buf[BUFSIZ]; | |
321 | struct ifconf ifc; | |
322 | struct ifreq ifreq, *ifr; | |
323 | int n; | |
324 | struct sockaddr_in *sin; | |
325 | register struct neighbor *np; | |
326 | ||
327 | ifc.ifc_len = sizeof (buf); | |
328 | ifc.ifc_buf = buf; | |
329 | if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { | |
330 | perror("rwhod: ioctl (get interface configuration)"); | |
331 | return (0); | |
332 | } | |
333 | ifr = ifc.ifc_req; | |
334 | for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) { | |
335 | for (np = neighbors; np != NULL; np = np->n_next) | |
336 | if (np->n_name && | |
337 | strcmp(ifr->ifr_name, np->n_name) == 0) | |
338 | break; | |
339 | if (np != NULL) | |
340 | continue; | |
341 | ifreq = *ifr; | |
342 | np = (struct neighbor *)malloc(sizeof (*np)); | |
343 | if (np == NULL) | |
344 | continue; | |
345 | np->n_name = malloc(strlen(ifr->ifr_name) + 1); | |
346 | if (np->n_name == NULL) { | |
347 | free((char *)np); | |
348 | continue; | |
349 | } | |
350 | strcpy(np->n_name, ifr->ifr_name); | |
351 | np->n_addrlen = sizeof (ifr->ifr_addr); | |
352 | np->n_addr = malloc(np->n_addrlen); | |
353 | if (np->n_addr == NULL) { | |
354 | free(np->n_name); | |
355 | free((char *)np); | |
356 | continue; | |
357 | } | |
358 | bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen); | |
359 | if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { | |
360 | perror("rwhod: ioctl (get interface flags)"); | |
361 | free((char *)np); | |
362 | continue; | |
363 | } | |
364 | if ((ifreq.ifr_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0) { | |
365 | free((char *)np); | |
366 | continue; | |
367 | } | |
368 | np->n_flags = ifreq.ifr_flags; | |
369 | if (np->n_flags & IFF_POINTOPOINT) { | |
370 | if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) { | |
371 | perror("rwhod: ioctl (get dstaddr)"); | |
372 | free((char *)np); | |
373 | continue; | |
374 | } | |
375 | /* we assume addresses are all the same size */ | |
376 | bcopy((char *)&ifreq.ifr_dstaddr, | |
377 | np->n_addr, np->n_addrlen); | |
378 | } | |
379 | if (np->n_flags & IFF_BROADCAST) { | |
380 | /* we assume addresses are all the same size */ | |
381 | sin = (struct sockaddr_in *)np->n_addr; | |
382 | sin->sin_addr = | |
383 | inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY); | |
384 | } | |
385 | /* gag, wish we could get rid of Internet dependencies */ | |
386 | sin = (struct sockaddr_in *)np->n_addr; | |
387 | sin->sin_port = sp->s_port; | |
388 | np->n_next = neighbors; | |
389 | neighbors = np; | |
390 | } | |
391 | return (1); | |
392 | } |