1 /*
2 * Copyright (c) 1988, 1992 The University of Utah and the Center
3 * for Software Science (CSS).
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * the Center for Software Science of the University of Utah Computer
9 * Science Department. CSS requests users of this software to return
10 * to css-dist@cs.utah.edu any improvements that they make and grant
11 * CSS redistribution rights.
12 *
13 * %sccs.include.redist.c%
14 *
15 * @(#)utils.c 8.2 (Berkeley) 02/22/94
16 *
17 * Utah $Hdr: utils.c 3.1 92/07/06$
18 * Author: Jeff Forys, University of Utah CSS
19 */
20
21 #ifndef lint
22 static char sccsid[] = "@(#)utils.c 8.2 (Berkeley) 02/22/94";
23 #endif /* not lint */
24
25 #include <sys/param.h>
26 #include <sys/time.h>
27
28 #include <fcntl.h>
29 #include <signal.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <syslog.h>
34 #include <time.h>
35 #include <unistd.h>
36 #include "defs.h"
37
38 /*
39 ** DispPkt -- Display the contents of an RMPCONN packet.
40 **
41 ** Parameters:
42 ** rconn - packet to be displayed.
43 ** direct - direction packet is going (DIR_*).
44 **
45 ** Returns:
46 ** Nothing.
47 **
48 ** Side Effects:
49 ** None.
50 */
51 void
DispPkt(rconn,direct)52 DispPkt(rconn, direct)
53 RMPCONN *rconn;
54 int direct;
55 {
56 static char BootFmt[] = "\t\tRetCode:%u SeqNo:%lx SessID:%x Vers:%u";
57 static char ReadFmt[] = "\t\tRetCode:%u Offset:%lx SessID:%x\n";
58
59 struct tm *tmp;
60 register struct rmp_packet *rmp;
61 int i, omask;
62 u_int t;
63
64 /*
65 * Since we will be working with RmpConns as well as DbgFp, we
66 * must block signals that can affect either.
67 */
68 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGUSR1)|sigmask(SIGUSR2));
69
70 if (DbgFp == NULL) { /* sanity */
71 (void) sigsetmask(omask);
72 return;
73 }
74
75 /* display direction packet is going using '>>>' or '<<<' */
76 fputs((direct==DIR_RCVD)?"<<< ":(direct==DIR_SENT)?">>> ":"", DbgFp);
77
78 /* display packet timestamp */
79 tmp = localtime((time_t *)&rconn->tstamp.tv_sec);
80 fprintf(DbgFp, "%02d:%02d:%02d.%06ld ", tmp->tm_hour, tmp->tm_min,
81 tmp->tm_sec, rconn->tstamp.tv_usec);
82
83 /* display src or dst addr and information about network interface */
84 fprintf(DbgFp, "Addr: %s Intf: %s\n", EnetStr(rconn), IntfName);
85
86 rmp = &rconn->rmp;
87
88 /* display IEEE 802.2 Logical Link Control header */
89 (void) fprintf(DbgFp, "\t802.2 LLC: DSAP:%x SSAP:%x CTRL:%x\n",
90 rmp->hp_llc.dsap, rmp->hp_llc.ssap, rmp->hp_llc.cntrl);
91
92 /* display HP extensions to 802.2 Logical Link Control header */
93 (void) fprintf(DbgFp, "\tHP Ext: DXSAP:%x SXSAP:%x\n",
94 rmp->hp_llc.dxsap, rmp->hp_llc.sxsap);
95
96 /*
97 * Display information about RMP packet using type field to
98 * determine what kind of packet this is.
99 */
100 switch(rmp->r_type) {
101 case RMP_BOOT_REQ: /* boot request */
102 (void) fprintf(DbgFp, "\tBoot Request:");
103 GETWORD(rmp->r_brq.rmp_seqno, t);
104 if (rmp->r_brq.rmp_session == RMP_PROBESID) {
105 if (WORDZE(rmp->r_brq.rmp_seqno))
106 fputs(" (Send Server ID)", DbgFp);
107 else
108 fprintf(DbgFp," (Send Filename #%u)",t);
109 }
110 (void) fputc('\n', DbgFp);
111 (void) fprintf(DbgFp, BootFmt, rmp->r_brq.rmp_retcode,
112 t, rmp->r_brq.rmp_session,
113 rmp->r_brq.rmp_version);
114 (void) fprintf(DbgFp, "\n\t\tMachine Type: ");
115 for (i = 0; i < RMP_MACHLEN; i++)
116 (void) fputc(rmp->r_brq.rmp_machtype[i], DbgFp);
117 DspFlnm(rmp->r_brq.rmp_flnmsize, &rmp->r_brq.rmp_flnm);
118 break;
119 case RMP_BOOT_REPL: /* boot reply */
120 fprintf(DbgFp, "\tBoot Reply:\n");
121 GETWORD(rmp->r_brpl.rmp_seqno, t);
122 (void) fprintf(DbgFp, BootFmt, rmp->r_brpl.rmp_retcode,
123 t, rmp->r_brpl.rmp_session,
124 rmp->r_brpl.rmp_version);
125 DspFlnm(rmp->r_brpl.rmp_flnmsize,&rmp->r_brpl.rmp_flnm);
126 break;
127 case RMP_READ_REQ: /* read request */
128 (void) fprintf(DbgFp, "\tRead Request:\n");
129 GETWORD(rmp->r_rrq.rmp_offset, t);
130 (void) fprintf(DbgFp, ReadFmt, rmp->r_rrq.rmp_retcode,
131 t, rmp->r_rrq.rmp_session);
132 (void) fprintf(DbgFp, "\t\tNoOfBytes: %u\n",
133 rmp->r_rrq.rmp_size);
134 break;
135 case RMP_READ_REPL: /* read reply */
136 (void) fprintf(DbgFp, "\tRead Reply:\n");
137 GETWORD(rmp->r_rrpl.rmp_offset, t);
138 (void) fprintf(DbgFp, ReadFmt, rmp->r_rrpl.rmp_retcode,
139 t, rmp->r_rrpl.rmp_session);
140 (void) fprintf(DbgFp, "\t\tNoOfBytesSent: %d\n",
141 rconn->rmplen - RMPREADSIZE(0));
142 break;
143 case RMP_BOOT_DONE: /* boot complete */
144 (void) fprintf(DbgFp, "\tBoot Complete:\n");
145 (void) fprintf(DbgFp, "\t\tRetCode:%u SessID:%x\n",
146 rmp->r_done.rmp_retcode,
147 rmp->r_done.rmp_session);
148 break;
149 default: /* ??? */
150 (void) fprintf(DbgFp, "\tUnknown Type:(%d)\n",
151 rmp->r_type);
152 }
153 (void) fputc('\n', DbgFp);
154 (void) fflush(DbgFp);
155
156 (void) sigsetmask(omask); /* reset old signal mask */
157 }
158
159
160 /*
161 ** GetEtherAddr -- convert an RMP (Ethernet) address into a string.
162 **
163 ** An RMP BOOT packet has been received. Look at the type field
164 ** and process Boot Requests, Read Requests, and Boot Complete
165 ** packets. Any other type will be dropped with a warning msg.
166 **
167 ** Parameters:
168 ** addr - array of RMP_ADDRLEN bytes.
169 **
170 ** Returns:
171 ** Pointer to static string representation of `addr'.
172 **
173 ** Side Effects:
174 ** None.
175 **
176 ** Warnings:
177 ** - The return value points to a static buffer; it must
178 ** be copied if it's to be saved.
179 ** - For speed, we assume a u_char consists of 8 bits.
180 */
181 char *
GetEtherAddr(addr)182 GetEtherAddr(addr)
183 u_char *addr;
184 {
185 static char Hex[] = "0123456789abcdef";
186 static char etherstr[RMP_ADDRLEN*3];
187 register int i;
188 register char *cp1, *cp2;
189
190 /*
191 * For each byte in `addr', convert it to "<hexchar><hexchar>:".
192 * The last byte does not get a trailing `:' appended.
193 */
194 i = 0;
195 cp1 = (char *)addr;
196 cp2 = etherstr;
197 for(;;) {
198 *cp2++ = Hex[*cp1 >> 4 & 0xf];
199 *cp2++ = Hex[*cp1++ & 0xf];
200 if (++i == RMP_ADDRLEN)
201 break;
202 *cp2++ = ':';
203 }
204 *cp2 = '\0';
205
206 return(etherstr);
207 }
208
209
210 /*
211 ** DispFlnm -- Print a string of bytes to DbgFp (often, a file name).
212 **
213 ** Parameters:
214 ** size - number of bytes to print.
215 ** flnm - address of first byte.
216 **
217 ** Returns:
218 ** Nothing.
219 **
220 ** Side Effects:
221 ** - Characters are sent to `DbgFp'.
222 */
223 void
DspFlnm(size,flnm)224 DspFlnm(size, flnm)
225 register u_int size;
226 register char *flnm;
227 {
228 register int i;
229
230 (void) fprintf(DbgFp, "\n\t\tFile Name (%d): <", size);
231 for (i = 0; i < size; i++)
232 (void) fputc(*flnm++, DbgFp);
233 (void) fputs(">\n", DbgFp);
234 }
235
236
237 /*
238 ** NewClient -- allocate memory for a new CLIENT.
239 **
240 ** Parameters:
241 ** addr - RMP (Ethernet) address of new client.
242 **
243 ** Returns:
244 ** Ptr to new CLIENT or NULL if we ran out of memory.
245 **
246 ** Side Effects:
247 ** - Memory will be malloc'd for the new CLIENT.
248 ** - If malloc() fails, a log message will be generated.
249 */
250 CLIENT *
NewClient(addr)251 NewClient(addr)
252 u_char *addr;
253 {
254 CLIENT *ctmp;
255
256 if ((ctmp = (CLIENT *) malloc(sizeof(CLIENT))) == NULL) {
257 syslog(LOG_ERR, "NewClient: out of memory (%s)",
258 GetEtherAddr(addr));
259 return(NULL);
260 }
261
262 bzero(ctmp, sizeof(CLIENT));
263 bcopy(addr, &ctmp->addr[0], RMP_ADDRLEN);
264 return(ctmp);
265 }
266
267 /*
268 ** FreeClient -- free linked list of Clients.
269 **
270 ** Parameters:
271 ** None.
272 **
273 ** Returns:
274 ** Nothing.
275 **
276 ** Side Effects:
277 ** - All malloc'd memory associated with the linked list of
278 ** CLIENTS will be free'd; `Clients' will be set to NULL.
279 **
280 ** Warnings:
281 ** - This routine must be called with SIGHUP blocked.
282 */
283 void
FreeClients()284 FreeClients()
285 {
286 register CLIENT *ctmp;
287
288 while (Clients != NULL) {
289 ctmp = Clients;
290 Clients = Clients->next;
291 FreeClient(ctmp);
292 }
293 }
294
295 /*
296 ** NewStr -- allocate memory for a character array.
297 **
298 ** Parameters:
299 ** str - null terminated character array.
300 **
301 ** Returns:
302 ** Ptr to new character array or NULL if we ran out of memory.
303 **
304 ** Side Effects:
305 ** - Memory will be malloc'd for the new character array.
306 ** - If malloc() fails, a log message will be generated.
307 */
308 char *
NewStr(str)309 NewStr(str)
310 char *str;
311 {
312 char *stmp;
313
314 if ((stmp = (char *)malloc((unsigned) (strlen(str)+1))) == NULL) {
315 syslog(LOG_ERR, "NewStr: out of memory (%s)", str);
316 return(NULL);
317 }
318
319 (void) strcpy(stmp, str);
320 return(stmp);
321 }
322
323 /*
324 ** To save time, NewConn and FreeConn maintain a cache of one RMPCONN
325 ** in `LastFree' (defined below).
326 */
327
328 static RMPCONN *LastFree = NULL;
329
330 /*
331 ** NewConn -- allocate memory for a new RMPCONN connection.
332 **
333 ** Parameters:
334 ** rconn - initialization template for new connection.
335 **
336 ** Returns:
337 ** Ptr to new RMPCONN or NULL if we ran out of memory.
338 **
339 ** Side Effects:
340 ** - Memory may be malloc'd for the new RMPCONN (if not cached).
341 ** - If malloc() fails, a log message will be generated.
342 */
343 RMPCONN *
NewConn(rconn)344 NewConn(rconn)
345 RMPCONN *rconn;
346 {
347 RMPCONN *rtmp;
348
349 if (LastFree == NULL) { /* nothing cached; make a new one */
350 if ((rtmp = (RMPCONN *) malloc(sizeof(RMPCONN))) == NULL) {
351 syslog(LOG_ERR, "NewConn: out of memory (%s)",
352 EnetStr(rconn));
353 return(NULL);
354 }
355 } else { /* use the cached RMPCONN */
356 rtmp = LastFree;
357 LastFree = NULL;
358 }
359
360 /*
361 * Copy template into `rtmp', init file descriptor to `-1' and
362 * set ptr to next elem NULL.
363 */
364 bcopy((char *)rconn, (char *)rtmp, sizeof(RMPCONN));
365 rtmp->bootfd = -1;
366 rtmp->next = NULL;
367
368 return(rtmp);
369 }
370
371 /*
372 ** FreeConn -- Free memory associated with an RMPCONN connection.
373 **
374 ** Parameters:
375 ** rtmp - ptr to RMPCONN to be free'd.
376 **
377 ** Returns:
378 ** Nothing.
379 **
380 ** Side Effects:
381 ** - Memory associated with `rtmp' may be free'd (or cached).
382 ** - File desc associated with `rtmp->bootfd' will be closed.
383 */
384 void
FreeConn(rtmp)385 FreeConn(rtmp)
386 register RMPCONN *rtmp;
387 {
388 /*
389 * If the file descriptor is in use, close the file.
390 */
391 if (rtmp->bootfd >= 0) {
392 (void) close(rtmp->bootfd);
393 rtmp->bootfd = -1;
394 }
395
396 if (LastFree == NULL) /* cache for next time */
397 rtmp = LastFree;
398 else /* already one cached; free this one */
399 free((char *)rtmp);
400 }
401
402 /*
403 ** FreeConns -- free linked list of RMPCONN connections.
404 **
405 ** Parameters:
406 ** None.
407 **
408 ** Returns:
409 ** Nothing.
410 **
411 ** Side Effects:
412 ** - All malloc'd memory associated with the linked list of
413 ** connections will be free'd; `RmpConns' will be set to NULL.
414 ** - If LastFree is != NULL, it too will be free'd & NULL'd.
415 **
416 ** Warnings:
417 ** - This routine must be called with SIGHUP blocked.
418 */
419 void
FreeConns()420 FreeConns()
421 {
422 register RMPCONN *rtmp;
423
424 while (RmpConns != NULL) {
425 rtmp = RmpConns;
426 RmpConns = RmpConns->next;
427 FreeConn(rtmp);
428 }
429
430 if (LastFree != NULL) {
431 free((char *)LastFree);
432 LastFree = NULL;
433 }
434 }
435
436 /*
437 ** AddConn -- Add a connection to the linked list of connections.
438 **
439 ** Parameters:
440 ** rconn - connection to be added.
441 **
442 ** Returns:
443 ** Nothing.
444 **
445 ** Side Effects:
446 ** - RmpConn will point to new connection.
447 **
448 ** Warnings:
449 ** - This routine must be called with SIGHUP blocked.
450 */
451 void
AddConn(rconn)452 AddConn(rconn)
453 register RMPCONN *rconn;
454 {
455 if (RmpConns != NULL)
456 rconn->next = RmpConns;
457 RmpConns = rconn;
458 }
459
460 /*
461 ** FindConn -- Find a connection in the linked list of connections.
462 **
463 ** We use the RMP (Ethernet) address as the basis for determining
464 ** if this is the same connection. According to the Remote Maint
465 ** Protocol, we can only have one connection with any machine.
466 **
467 ** Parameters:
468 ** rconn - connection to be found.
469 **
470 ** Returns:
471 ** Matching connection from linked list or NULL if not found.
472 **
473 ** Side Effects:
474 ** None.
475 **
476 ** Warnings:
477 ** - This routine must be called with SIGHUP blocked.
478 */
479 RMPCONN *
FindConn(rconn)480 FindConn(rconn)
481 register RMPCONN *rconn;
482 {
483 register RMPCONN *rtmp;
484
485 for (rtmp = RmpConns; rtmp != NULL; rtmp = rtmp->next)
486 if (bcmp((char *)&rconn->rmp.hp_hdr.saddr[0],
487 (char *)&rtmp->rmp.hp_hdr.saddr[0], RMP_ADDRLEN) == 0)
488 break;
489
490 return(rtmp);
491 }
492
493 /*
494 ** RemoveConn -- Remove a connection from the linked list of connections.
495 **
496 ** Parameters:
497 ** rconn - connection to be removed.
498 **
499 ** Returns:
500 ** Nothing.
501 **
502 ** Side Effects:
503 ** - If found, an RMPCONN will cease to exist and it will
504 ** be removed from the linked list.
505 **
506 ** Warnings:
507 ** - This routine must be called with SIGHUP blocked.
508 */
509 void
RemoveConn(rconn)510 RemoveConn(rconn)
511 register RMPCONN *rconn;
512 {
513 register RMPCONN *thisrconn, *lastrconn;
514
515 if (RmpConns == rconn) { /* easy case */
516 RmpConns = RmpConns->next;
517 FreeConn(rconn);
518 } else { /* must traverse linked list */
519 lastrconn = RmpConns; /* set back ptr */
520 thisrconn = lastrconn->next; /* set current ptr */
521 while (thisrconn != NULL) {
522 if (rconn == thisrconn) { /* found it */
523 lastrconn->next = thisrconn->next;
524 FreeConn(thisrconn);
525 break;
526 }
527 lastrconn = thisrconn;
528 thisrconn = thisrconn->next;
529 }
530 }
531 }
532