1 /************************************************************************
2 Copyright 1988, 1991 by Carnegie Mellon University
3
4 All Rights Reserved
5
6 Permission to use, copy, modify, and distribute this software and its
7 documentation for any purpose and without fee is hereby granted, provided
8 that the above copyright notice appear in all copies and that both that
9 copyright notice and this permission notice appear in supporting
10 documentation, and that the name of Carnegie Mellon University not be used
11 in advertising or publicity pertaining to distribution of the software
12 without specific, written prior permission.
13
14 CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
15 SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
16 IN NO EVENT SHALL CMU BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
17 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
18 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
19 ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
20 SOFTWARE.
21
22 $FreeBSD$
23
24 ************************************************************************/
25
26 /*
27 * bootpd configuration file reading code.
28 *
29 * The routines in this file deal with reading, interpreting, and storing
30 * the information found in the bootpd configuration file (usually
31 * /etc/bootptab).
32 */
33
34
35 #include <sys/errno.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <sys/file.h>
39 #include <sys/time.h>
40 #include <netinet/in.h>
41
42 #include <stdlib.h>
43 #include <stdio.h>
44 #include <string.h>
45 #include <ctype.h>
46 #include <assert.h>
47 #include <syslog.h>
48
49 #ifndef USE_BFUNCS
50 #include <memory.h>
51 /* Yes, memcpy is OK here (no overlapped copies). */
52 #define bcopy(a,b,c) memcpy(b,a,c)
53 #define bzero(p,l) memset(p,0,l)
54 #define bcmp(a,b,c) memcmp(a,b,c)
55 #endif
56
57 #include "bootp.h"
58 #include "hash.h"
59 #include "hwaddr.h"
60 #include "lookup.h"
61 #include "readfile.h"
62 #include "report.h"
63 #include "tzone.h"
64 #include "bootpd.h"
65
66 #define HASHTABLESIZE 257 /* Hash table size (prime) */
67
68 /* Non-standard hardware address type (see bootp.h) */
69 #define HTYPE_DIRECT 0
70
71 /* Error codes returned by eval_symbol: */
72 #define SUCCESS 0
73 #define E_END_OF_ENTRY (-1)
74 #define E_SYNTAX_ERROR (-2)
75 #define E_UNKNOWN_SYMBOL (-3)
76 #define E_BAD_IPADDR (-4)
77 #define E_BAD_HWADDR (-5)
78 #define E_BAD_LONGWORD (-6)
79 #define E_BAD_HWATYPE (-7)
80 #define E_BAD_PATHNAME (-8)
81 #define E_BAD_VALUE (-9)
82
83 /* Tag idendities. */
84 #define SYM_NULL 0
85 #define SYM_BOOTFILE 1
86 #define SYM_COOKIE_SERVER 2
87 #define SYM_DOMAIN_SERVER 3
88 #define SYM_GATEWAY 4
89 #define SYM_HWADDR 5
90 #define SYM_HOMEDIR 6
91 #define SYM_HTYPE 7
92 #define SYM_IMPRESS_SERVER 8
93 #define SYM_IPADDR 9
94 #define SYM_LOG_SERVER 10
95 #define SYM_LPR_SERVER 11
96 #define SYM_NAME_SERVER 12
97 #define SYM_RLP_SERVER 13
98 #define SYM_SUBNET_MASK 14
99 #define SYM_TIME_OFFSET 15
100 #define SYM_TIME_SERVER 16
101 #define SYM_VENDOR_MAGIC 17
102 #define SYM_SIMILAR_ENTRY 18
103 #define SYM_NAME_SWITCH 19
104 #define SYM_BOOTSIZE 20
105 #define SYM_BOOT_SERVER 22
106 #define SYM_TFTPDIR 23
107 #define SYM_DUMP_FILE 24
108 #define SYM_DOMAIN_NAME 25
109 #define SYM_SWAP_SERVER 26
110 #define SYM_ROOT_PATH 27
111 #define SYM_EXTEN_FILE 28
112 #define SYM_REPLY_ADDR 29
113 #define SYM_NIS_DOMAIN 30 /* RFC 1533 */
114 #define SYM_NIS_SERVER 31 /* RFC 1533 */
115 #define SYM_NTP_SERVER 32 /* RFC 1533 */
116 #define SYM_EXEC_FILE 33 /* YORK_EX_OPTION */
117 #define SYM_MSG_SIZE 34
118 #define SYM_MIN_WAIT 35
119 /* XXX - Add new tags here */
120
121 #define OP_ADDITION 1 /* Operations on tags */
122 #define OP_DELETION 2
123 #define OP_BOOLEAN 3
124
125 #define MAXINADDRS 16 /* Max size of an IP address list */
126 #define MAXBUFLEN 256 /* Max temp buffer space */
127 #define MAXENTRYLEN 2048 /* Max size of an entire entry */
128
129
130
131 /*
132 * Structure used to map a configuration-file symbol (such as "ds") to a
133 * unique integer.
134 */
135
136 struct symbolmap {
137 char *symbol;
138 int symbolcode;
139 };
140
141
142 struct htypename {
143 char *name;
144 byte htype;
145 };
146
147
148 PRIVATE int nhosts; /* Number of hosts (/w hw or IP address) */
149 PRIVATE int nentries; /* Total number of entries */
150 PRIVATE int32 modtime = 0; /* Last modification time of bootptab */
151 PRIVATE char *current_hostname; /* Name of the current entry. */
152 PRIVATE char current_tagname[8];
153
154 /*
155 * List of symbolic names used in the bootptab file. The order and actual
156 * values of the symbol codes (SYM_. . .) are unimportant, but they must
157 * all be unique.
158 */
159
160 PRIVATE struct symbolmap symbol_list[] = {
161 {"bf", SYM_BOOTFILE},
162 {"bs", SYM_BOOTSIZE},
163 {"cs", SYM_COOKIE_SERVER},
164 {"df", SYM_DUMP_FILE},
165 {"dn", SYM_DOMAIN_NAME},
166 {"ds", SYM_DOMAIN_SERVER},
167 {"ef", SYM_EXTEN_FILE},
168 {"ex", SYM_EXEC_FILE}, /* YORK_EX_OPTION */
169 {"gw", SYM_GATEWAY},
170 {"ha", SYM_HWADDR},
171 {"hd", SYM_HOMEDIR},
172 {"hn", SYM_NAME_SWITCH},
173 {"ht", SYM_HTYPE},
174 {"im", SYM_IMPRESS_SERVER},
175 {"ip", SYM_IPADDR},
176 {"lg", SYM_LOG_SERVER},
177 {"lp", SYM_LPR_SERVER},
178 {"ms", SYM_MSG_SIZE},
179 {"mw", SYM_MIN_WAIT},
180 {"ns", SYM_NAME_SERVER},
181 {"nt", SYM_NTP_SERVER},
182 {"ra", SYM_REPLY_ADDR},
183 {"rl", SYM_RLP_SERVER},
184 {"rp", SYM_ROOT_PATH},
185 {"sa", SYM_BOOT_SERVER},
186 {"sm", SYM_SUBNET_MASK},
187 {"sw", SYM_SWAP_SERVER},
188 {"tc", SYM_SIMILAR_ENTRY},
189 {"td", SYM_TFTPDIR},
190 {"to", SYM_TIME_OFFSET},
191 {"ts", SYM_TIME_SERVER},
192 {"vm", SYM_VENDOR_MAGIC},
193 {"yd", SYM_NIS_DOMAIN},
194 {"ys", SYM_NIS_SERVER},
195 /* XXX - Add new tags here */
196 };
197
198
199 /*
200 * List of symbolic names for hardware types. Name translates into
201 * hardware type code listed with it. Names must begin with a letter
202 * and must be all lowercase. This is searched linearly, so put
203 * commonly-used entries near the beginning.
204 */
205
206 PRIVATE struct htypename htnamemap[] = {
207 {"ethernet", HTYPE_ETHERNET},
208 {"ethernet3", HTYPE_EXP_ETHERNET},
209 {"ether", HTYPE_ETHERNET},
210 {"ether3", HTYPE_EXP_ETHERNET},
211 {"ieee802", HTYPE_IEEE802},
212 {"tr", HTYPE_IEEE802},
213 {"token-ring", HTYPE_IEEE802},
214 {"pronet", HTYPE_PRONET},
215 {"chaos", HTYPE_CHAOS},
216 {"arcnet", HTYPE_ARCNET},
217 {"ax.25", HTYPE_AX25},
218 {"direct", HTYPE_DIRECT},
219 {"serial", HTYPE_DIRECT},
220 {"slip", HTYPE_DIRECT},
221 {"ppp", HTYPE_DIRECT}
222 };
223
224
225
226 /*
227 * Externals and forward declarations.
228 */
229
230 extern boolean iplookcmp();
231 boolean nmcmp(hash_datum *, hash_datum *);
232
233 PRIVATE void
234 adjust(char **);
235 PRIVATE void
236 del_string(struct shared_string *);
237 PRIVATE void
238 del_bindata(struct shared_bindata *);
239 PRIVATE void
240 del_iplist(struct in_addr_list *);
241 PRIVATE void
242 eat_whitespace(char **);
243 PRIVATE int
244 eval_symbol(char **, struct host *);
245 PRIVATE void
246 fill_defaults(struct host *, char **);
247 PRIVATE void
248 free_host(hash_datum *);
249 PRIVATE struct in_addr_list *
250 get_addresses(char **);
251 PRIVATE struct shared_string *
252 get_shared_string(char **);
253 PRIVATE char *
254 get_string(char **, char *, u_int *);
255 PRIVATE u_int32
256 get_u_long(char **);
257 PRIVATE boolean
258 goodname(char *);
259 PRIVATE boolean
260 hwinscmp(hash_datum *, hash_datum *);
261 PRIVATE int
262 interp_byte(char **, byte *);
263 PRIVATE void
264 makelower(char *);
265 PRIVATE boolean
266 nullcmp(hash_datum *, hash_datum *);
267 PRIVATE int
268 process_entry(struct host *, char *);
269 PRIVATE int
270 process_generic(char **, struct shared_bindata **, u_int);
271 PRIVATE byte *
272 prs_haddr(char **, u_int);
273 PRIVATE int
274 prs_inetaddr(char **, u_int32 *);
275 PRIVATE void
276 read_entry(FILE *, char *, u_int *);
277 PRIVATE char *
278 smalloc(u_int);
279
280
281 /*
282 * Vendor magic cookies for CMU and RFC1048
283 */
284 u_char vm_cmu[4] = VM_CMU;
285 u_char vm_rfc1048[4] = VM_RFC1048;
286
287 /*
288 * Main hash tables
289 */
290 hash_tbl *hwhashtable;
291 hash_tbl *iphashtable;
292 hash_tbl *nmhashtable;
293
294 /*
295 * Allocate hash tables for hardware address, ip address, and hostname
296 * (shared by bootpd and bootpef)
297 */
298 void
rdtab_init()299 rdtab_init()
300 {
301 hwhashtable = hash_Init(HASHTABLESIZE);
302 iphashtable = hash_Init(HASHTABLESIZE);
303 nmhashtable = hash_Init(HASHTABLESIZE);
304 if (!(hwhashtable && iphashtable && nmhashtable)) {
305 report(LOG_ERR, "Unable to allocate hash tables.");
306 exit(1);
307 }
308 }
309
310
311 /*
312 * Read bootptab database file. Avoid rereading the file if the
313 * write date hasn't changed since the last time we read it.
314 */
315
316 void
readtab(force)317 readtab(force)
318 int force;
319 {
320 struct host *hp;
321 FILE *fp;
322 struct stat st;
323 unsigned hashcode, buflen;
324 static char buffer[MAXENTRYLEN];
325
326 /*
327 * Check the last modification time.
328 */
329 if (stat(bootptab, &st) < 0) {
330 report(LOG_ERR, "stat on \"%s\": %s",
331 bootptab, get_errmsg());
332 return;
333 }
334 #ifdef DEBUG
335 if (debug > 3) {
336 char timestr[28];
337 strcpy(timestr, ctime(&(st.st_mtime)));
338 /* zap the newline */
339 timestr[24] = '\0';
340 report(LOG_INFO, "bootptab mtime: %s",
341 timestr);
342 }
343 #endif
344 if ((force == 0) &&
345 (st.st_mtime == modtime) &&
346 st.st_nlink) {
347 /*
348 * hasn't been modified or deleted yet.
349 */
350 return;
351 }
352 if (debug)
353 report(LOG_INFO, "reading %s\"%s\"",
354 (modtime != 0L) ? "new " : "",
355 bootptab);
356
357 /*
358 * Open bootptab file.
359 */
360 if ((fp = fopen(bootptab, "r")) == NULL) {
361 report(LOG_ERR, "error opening \"%s\": %s", bootptab, get_errmsg());
362 return;
363 }
364 /*
365 * Record file modification time.
366 */
367 if (fstat(fileno(fp), &st) < 0) {
368 report(LOG_ERR, "fstat: %s", get_errmsg());
369 fclose(fp);
370 return;
371 }
372 modtime = st.st_mtime;
373
374 /*
375 * Entirely erase all hash tables.
376 */
377 hash_Reset(hwhashtable, free_host);
378 hash_Reset(iphashtable, free_host);
379 hash_Reset(nmhashtable, free_host);
380
381 nhosts = 0;
382 nentries = 0;
383 while (TRUE) {
384 buflen = sizeof(buffer);
385 read_entry(fp, buffer, &buflen);
386 if (buflen == 0) { /* More entries? */
387 break;
388 }
389 hp = (struct host *) smalloc(sizeof(struct host));
390 bzero((char *) hp, sizeof(*hp));
391 /* the link count it zero */
392
393 /*
394 * Get individual info
395 */
396 if (process_entry(hp, buffer) < 0) {
397 hp->linkcount = 1;
398 free_host((hash_datum *) hp);
399 continue;
400 }
401 /*
402 * If this is not a dummy entry, and the IP or HW
403 * address is not yet set, try to get them here.
404 * Dummy entries have . as first char of name.
405 */
406 if (goodname(hp->hostname->string)) {
407 char *hn = hp->hostname->string;
408 u_int32 value;
409 if (hp->flags.iaddr == 0) {
410 if (lookup_ipa(hn, &value)) {
411 report(LOG_ERR, "can not get IP addr for %s", hn);
412 report(LOG_ERR, "(dummy names should start with '.')");
413 } else {
414 hp->iaddr.s_addr = value;
415 hp->flags.iaddr = TRUE;
416 }
417 }
418 /* Set default subnet mask. */
419 if (hp->flags.subnet_mask == 0) {
420 if (lookup_netmask(hp->iaddr.s_addr, &value)) {
421 report(LOG_ERR, "can not get netmask for %s", hn);
422 } else {
423 hp->subnet_mask.s_addr = value;
424 hp->flags.subnet_mask = TRUE;
425 }
426 }
427 }
428 if (hp->flags.iaddr) {
429 nhosts++;
430 }
431 /* Register by HW addr if known. */
432 if (hp->flags.htype && hp->flags.haddr) {
433 /* We will either insert it or free it. */
434 hp->linkcount++;
435 hashcode = hash_HashFunction(hp->haddr, haddrlength(hp->htype));
436 if (hash_Insert(hwhashtable, hashcode, hwinscmp, hp, hp) < 0) {
437 report(LOG_NOTICE, "duplicate %s address: %s",
438 netname(hp->htype),
439 haddrtoa(hp->haddr, haddrlength(hp->htype)));
440 free_host((hash_datum *) hp);
441 continue;
442 }
443 }
444 /* Register by IP addr if known. */
445 if (hp->flags.iaddr) {
446 hashcode = hash_HashFunction((u_char *) & (hp->iaddr.s_addr), 4);
447 if (hash_Insert(iphashtable, hashcode, nullcmp, hp, hp) < 0) {
448 report(LOG_ERR,
449 "hash_Insert() failed on IP address insertion");
450 } else {
451 /* Just inserted the host struct in a new hash list. */
452 hp->linkcount++;
453 }
454 }
455 /* Register by Name (always known) */
456 hashcode = hash_HashFunction((u_char *) hp->hostname->string,
457 strlen(hp->hostname->string));
458 if (hash_Insert(nmhashtable, hashcode, nullcmp,
459 hp->hostname->string, hp) < 0) {
460 report(LOG_ERR,
461 "hash_Insert() failed on insertion of hostname: \"%s\"",
462 hp->hostname->string);
463 } else {
464 /* Just inserted the host struct in a new hash list. */
465 hp->linkcount++;
466 }
467
468 nentries++;
469 }
470
471 fclose(fp);
472 if (debug)
473 report(LOG_INFO, "read %d entries (%d hosts) from \"%s\"",
474 nentries, nhosts, bootptab);
475 return;
476 }
477
478
479
480 /*
481 * Read an entire host entry from the file pointed to by "fp" and insert it
482 * into the memory pointed to by "buffer". Leading whitespace and comments
483 * starting with "#" are ignored (removed). Backslashes (\) always quote
484 * the next character except that newlines preceded by a backslash cause
485 * line-continuation onto the next line. The entry is terminated by a
486 * newline character which is not preceded by a backslash. Sequences
487 * surrounded by double quotes are taken literally (including newlines, but
488 * not backslashes).
489 *
490 * The "bufsiz" parameter points to an unsigned int which specifies the
491 * maximum permitted buffer size. Upon return, this value will be replaced
492 * with the actual length of the entry (not including the null terminator).
493 *
494 * This code is a little scary. . . . I don't like using gotos in C
495 * either, but I first wrote this as an FSM diagram and gotos seemed like
496 * the easiest way to implement it. Maybe later I'll clean it up.
497 */
498
499 PRIVATE void
read_entry(fp,buffer,bufsiz)500 read_entry(fp, buffer, bufsiz)
501 FILE *fp;
502 char *buffer;
503 unsigned *bufsiz;
504 {
505 int c, length;
506
507 length = 0;
508
509 /*
510 * Eat whitespace, blank lines, and comment lines.
511 */
512 top:
513 c = fgetc(fp);
514 if (c < 0) {
515 goto done; /* Exit if end-of-file */
516 }
517 if (isspace(c)) {
518 goto top; /* Skip over whitespace */
519 }
520 if (c == '#') {
521 while (TRUE) { /* Eat comments after # */
522 c = fgetc(fp);
523 if (c < 0) {
524 goto done; /* Exit if end-of-file */
525 }
526 if (c == '\n') {
527 goto top; /* Try to read the next line */
528 }
529 }
530 }
531 ungetc(c, fp); /* Other character, push it back to reprocess it */
532
533
534 /*
535 * Now we're actually reading a data entry. Get each character and
536 * assemble it into the data buffer, processing special characters like
537 * double quotes (") and backslashes (\).
538 */
539
540 mainloop:
541 c = fgetc(fp);
542 switch (c) {
543 case EOF:
544 case '\n':
545 goto done; /* Exit on EOF or newline */
546 case '\\':
547 c = fgetc(fp); /* Backslash, read a new character */
548 if (c < 0) {
549 goto done; /* Exit on EOF */
550 }
551 *buffer++ = c; /* Store the literal character */
552 length++;
553 if (length < *bufsiz - 1) {
554 goto mainloop;
555 } else {
556 goto done;
557 }
558 case '"':
559 *buffer++ = '"'; /* Store double-quote */
560 length++;
561 if (length >= *bufsiz - 1) {
562 goto done;
563 }
564 while (TRUE) { /* Special quote processing loop */
565 c = fgetc(fp);
566 switch (c) {
567 case EOF:
568 goto done; /* Exit on EOF . . . */
569 case '"':
570 *buffer++ = '"';/* Store matching quote */
571 length++;
572 if (length < *bufsiz - 1) {
573 goto mainloop; /* And continue main loop */
574 } else {
575 goto done;
576 }
577 case '\\':
578 if ((c = fgetc(fp)) < 0) { /* Backslash */
579 goto done; /* EOF. . . .*/
580 }
581 /* FALLTHROUGH */
582 default:
583 *buffer++ = c; /* Other character, store it */
584 length++;
585 if (length >= *bufsiz - 1) {
586 goto done;
587 }
588 }
589 }
590 case ':':
591 *buffer++ = c; /* Store colons */
592 length++;
593 if (length >= *bufsiz - 1) {
594 goto done;
595 }
596 do { /* But remove whitespace after them */
597 c = fgetc(fp);
598 if ((c < 0) || (c == '\n')) {
599 goto done;
600 }
601 } while (isspace(c)); /* Skip whitespace */
602
603 if (c == '\\') { /* Backslash quotes next character */
604 c = fgetc(fp);
605 if (c < 0) {
606 goto done;
607 }
608 if (c == '\n') {
609 goto top; /* Backslash-newline continuation */
610 }
611 }
612 /* FALLTHROUGH if "other" character */
613 default:
614 *buffer++ = c; /* Store other characters */
615 length++;
616 if (length >= *bufsiz - 1) {
617 goto done;
618 }
619 }
620 goto mainloop; /* Keep going */
621
622 done:
623 *buffer = '\0'; /* Terminate string */
624 *bufsiz = length; /* Tell the caller its length */
625 }
626
627
628
629 /*
630 * Parse out all the various tags and parameters in the host entry pointed
631 * to by "src". Stuff all the data into the appropriate fields of the
632 * host structure pointed to by "host". If there is any problem with the
633 * entry, an error message is reported via report(), no further processing
634 * is done, and -1 is returned. Successful calls return 0.
635 *
636 * (Some errors probably shouldn't be so completely fatal. . . .)
637 */
638
639 PRIVATE int
process_entry(host,src)640 process_entry(host, src)
641 struct host *host;
642 char *src;
643 {
644 int retval;
645 char *msg;
646
647 if (!host || *src == '\0') {
648 return -1;
649 }
650 host->hostname = get_shared_string(&src);
651 #if 0
652 /* Be more liberal for the benefit of dummy tag names. */
653 if (!goodname(host->hostname->string)) {
654 report(LOG_ERR, "bad hostname: \"%s\"", host->hostname->string);
655 del_string(host->hostname);
656 return -1;
657 }
658 #endif
659 current_hostname = host->hostname->string;
660 adjust(&src);
661 while (TRUE) {
662 retval = eval_symbol(&src, host);
663 if (retval == SUCCESS) {
664 adjust(&src);
665 continue;
666 }
667 if (retval == E_END_OF_ENTRY) {
668 /* The default subnet mask is set in readtab() */
669 return 0;
670 }
671 /* Some kind of error. */
672 switch (retval) {
673 case E_SYNTAX_ERROR:
674 msg = "bad syntax";
675 break;
676 case E_UNKNOWN_SYMBOL:
677 msg = "unknown symbol";
678 break;
679 case E_BAD_IPADDR:
680 msg = "bad INET address";
681 break;
682 case E_BAD_HWADDR:
683 msg = "bad hardware address";
684 break;
685 case E_BAD_LONGWORD:
686 msg = "bad longword value";
687 break;
688 case E_BAD_HWATYPE:
689 msg = "bad HW address type";
690 break;
691 case E_BAD_PATHNAME:
692 msg = "bad pathname (need leading '/')";
693 break;
694 case E_BAD_VALUE:
695 msg = "bad value";
696 break;
697 default:
698 msg = "unknown error";
699 break;
700 } /* switch */
701 report(LOG_ERR, "in entry named \"%s\", symbol \"%s\": %s",
702 current_hostname, current_tagname, msg);
703 return -1;
704 }
705 }
706
707
708 /*
709 * Macros for use in the function below:
710 */
711
712 /* Parse one INET address stored directly in MEMBER. */
713 #define PARSE_IA1(MEMBER) do \
714 { \
715 if (optype == OP_BOOLEAN) \
716 return E_SYNTAX_ERROR; \
717 hp->flags.MEMBER = FALSE; \
718 if (optype == OP_ADDITION) { \
719 if (prs_inetaddr(symbol, &value) < 0) \
720 return E_BAD_IPADDR; \
721 hp->MEMBER.s_addr = value; \
722 hp->flags.MEMBER = TRUE; \
723 } \
724 } while (0)
725
726 /* Parse a list of INET addresses pointed to by MEMBER */
727 #define PARSE_IAL(MEMBER) do \
728 { \
729 if (optype == OP_BOOLEAN) \
730 return E_SYNTAX_ERROR; \
731 if (hp->flags.MEMBER) { \
732 hp->flags.MEMBER = FALSE; \
733 assert(hp->MEMBER); \
734 del_iplist(hp->MEMBER); \
735 hp->MEMBER = NULL; \
736 } \
737 if (optype == OP_ADDITION) { \
738 hp->MEMBER = get_addresses(symbol); \
739 if (hp->MEMBER == NULL) \
740 return E_SYNTAX_ERROR; \
741 hp->flags.MEMBER = TRUE; \
742 } \
743 } while (0)
744
745 /* Parse a shared string pointed to by MEMBER */
746 #define PARSE_STR(MEMBER) do \
747 { \
748 if (optype == OP_BOOLEAN) \
749 return E_SYNTAX_ERROR; \
750 if (hp->flags.MEMBER) { \
751 hp->flags.MEMBER = FALSE; \
752 assert(hp->MEMBER); \
753 del_string(hp->MEMBER); \
754 hp->MEMBER = NULL; \
755 } \
756 if (optype == OP_ADDITION) { \
757 hp->MEMBER = get_shared_string(symbol); \
758 if (hp->MEMBER == NULL) \
759 return E_SYNTAX_ERROR; \
760 hp->flags.MEMBER = TRUE; \
761 } \
762 } while (0)
763
764 /* Parse an unsigned integer value for MEMBER */
765 #define PARSE_UINT(MEMBER) do \
766 { \
767 if (optype == OP_BOOLEAN) \
768 return E_SYNTAX_ERROR; \
769 hp->flags.MEMBER = FALSE; \
770 if (optype == OP_ADDITION) { \
771 value = get_u_long(symbol); \
772 hp->MEMBER = value; \
773 hp->flags.MEMBER = TRUE; \
774 } \
775 } while (0)
776
777 /*
778 * Evaluate the two-character tag symbol pointed to by "symbol" and place
779 * the data in the structure pointed to by "hp". The pointer pointed to
780 * by "symbol" is updated to point past the source string (but may not
781 * point to the next tag entry).
782 *
783 * Obviously, this need a few more comments. . . .
784 */
785 PRIVATE int
eval_symbol(symbol,hp)786 eval_symbol(symbol, hp)
787 char **symbol;
788 struct host *hp;
789 {
790 char tmpstr[MAXSTRINGLEN];
791 byte *tmphaddr;
792 struct symbolmap *symbolptr;
793 u_int32 value;
794 int32 timeoff;
795 int i, numsymbols;
796 unsigned len;
797 int optype; /* Indicates boolean, addition, or deletion */
798
799 eat_whitespace(symbol);
800
801 /* Make sure this is set before returning. */
802 current_tagname[0] = (*symbol)[0];
803 current_tagname[1] = (*symbol)[1];
804 current_tagname[2] = 0;
805
806 if ((*symbol)[0] == '\0') {
807 return E_END_OF_ENTRY;
808 }
809 if ((*symbol)[0] == ':') {
810 return SUCCESS;
811 }
812 if ((*symbol)[0] == 'T') { /* generic symbol */
813 (*symbol)++;
814 value = get_u_long(symbol);
815 snprintf(current_tagname, sizeof(current_tagname),
816 "T%d", (int)value);
817 eat_whitespace(symbol);
818 if ((*symbol)[0] != '=') {
819 return E_SYNTAX_ERROR;
820 }
821 (*symbol)++;
822 if (!(hp->generic)) {
823 hp->generic = (struct shared_bindata *)
824 smalloc(sizeof(struct shared_bindata));
825 }
826 if (process_generic(symbol, &(hp->generic), (byte) (value & 0xFF)))
827 return E_SYNTAX_ERROR;
828 hp->flags.generic = TRUE;
829 return SUCCESS;
830 }
831 /*
832 * Determine the type of operation to be done on this symbol
833 */
834 switch ((*symbol)[2]) {
835 case '=':
836 optype = OP_ADDITION;
837 break;
838 case '@':
839 optype = OP_DELETION;
840 break;
841 case ':':
842 case '\0':
843 optype = OP_BOOLEAN;
844 break;
845 default:
846 return E_SYNTAX_ERROR;
847 }
848
849 symbolptr = symbol_list;
850 numsymbols = sizeof(symbol_list) / sizeof(struct symbolmap);
851 for (i = 0; i < numsymbols; i++) {
852 if (((symbolptr->symbol)[0] == (*symbol)[0]) &&
853 ((symbolptr->symbol)[1] == (*symbol)[1])) {
854 break;
855 }
856 symbolptr++;
857 }
858 if (i >= numsymbols) {
859 return E_UNKNOWN_SYMBOL;
860 }
861 /*
862 * Skip past the = or @ character (to point to the data) if this
863 * isn't a boolean operation. For boolean operations, just skip
864 * over the two-character tag symbol (and nothing else. . . .).
865 */
866 (*symbol) += (optype == OP_BOOLEAN) ? 2 : 3;
867
868 eat_whitespace(symbol);
869
870 /* The cases below are in order by symbolcode value. */
871 switch (symbolptr->symbolcode) {
872
873 case SYM_BOOTFILE:
874 PARSE_STR(bootfile);
875 break;
876
877 case SYM_COOKIE_SERVER:
878 PARSE_IAL(cookie_server);
879 break;
880
881 case SYM_DOMAIN_SERVER:
882 PARSE_IAL(domain_server);
883 break;
884
885 case SYM_GATEWAY:
886 PARSE_IAL(gateway);
887 break;
888
889 case SYM_HWADDR:
890 if (optype == OP_BOOLEAN)
891 return E_SYNTAX_ERROR;
892 hp->flags.haddr = FALSE;
893 if (optype == OP_ADDITION) {
894 /* Default the HW type to Ethernet */
895 if (hp->flags.htype == 0) {
896 hp->flags.htype = TRUE;
897 hp->htype = HTYPE_ETHERNET;
898 }
899 tmphaddr = prs_haddr(symbol, hp->htype);
900 if (!tmphaddr)
901 return E_BAD_HWADDR;
902 bcopy(tmphaddr, hp->haddr, haddrlength(hp->htype));
903 hp->flags.haddr = TRUE;
904 }
905 break;
906
907 case SYM_HOMEDIR:
908 PARSE_STR(homedir);
909 break;
910
911 case SYM_HTYPE:
912 if (optype == OP_BOOLEAN)
913 return E_SYNTAX_ERROR;
914 hp->flags.htype = FALSE;
915 if (optype == OP_ADDITION) {
916 value = 0L; /* Assume an illegal value */
917 eat_whitespace(symbol);
918 if (isdigit(**symbol)) {
919 value = get_u_long(symbol);
920 } else {
921 len = sizeof(tmpstr);
922 (void) get_string(symbol, tmpstr, &len);
923 makelower(tmpstr);
924 numsymbols = sizeof(htnamemap) /
925 sizeof(struct htypename);
926 for (i = 0; i < numsymbols; i++) {
927 if (!strcmp(htnamemap[i].name, tmpstr)) {
928 break;
929 }
930 }
931 if (i < numsymbols) {
932 value = htnamemap[i].htype;
933 }
934 }
935 if (value >= hwinfocnt) {
936 return E_BAD_HWATYPE;
937 }
938 hp->htype = (byte) (value & 0xFF);
939 hp->flags.htype = TRUE;
940 }
941 break;
942
943 case SYM_IMPRESS_SERVER:
944 PARSE_IAL(impress_server);
945 break;
946
947 case SYM_IPADDR:
948 PARSE_IA1(iaddr);
949 break;
950
951 case SYM_LOG_SERVER:
952 PARSE_IAL(log_server);
953 break;
954
955 case SYM_LPR_SERVER:
956 PARSE_IAL(lpr_server);
957 break;
958
959 case SYM_NAME_SERVER:
960 PARSE_IAL(name_server);
961 break;
962
963 case SYM_RLP_SERVER:
964 PARSE_IAL(rlp_server);
965 break;
966
967 case SYM_SUBNET_MASK:
968 PARSE_IA1(subnet_mask);
969 break;
970
971 case SYM_TIME_OFFSET:
972 if (optype == OP_BOOLEAN)
973 return E_SYNTAX_ERROR;
974 hp->flags.time_offset = FALSE;
975 if (optype == OP_ADDITION) {
976 len = sizeof(tmpstr);
977 (void) get_string(symbol, tmpstr, &len);
978 if (!strncmp(tmpstr, "auto", 4)) {
979 hp->time_offset = secondswest;
980 } else {
981 if (sscanf(tmpstr, "%d", (int*)&timeoff) != 1)
982 return E_BAD_LONGWORD;
983 hp->time_offset = timeoff;
984 }
985 hp->flags.time_offset = TRUE;
986 }
987 break;
988
989 case SYM_TIME_SERVER:
990 PARSE_IAL(time_server);
991 break;
992
993 case SYM_VENDOR_MAGIC:
994 if (optype == OP_BOOLEAN)
995 return E_SYNTAX_ERROR;
996 hp->flags.vm_cookie = FALSE;
997 if (optype == OP_ADDITION) {
998 if (strncmp(*symbol, "auto", 4)) {
999 /* The string is not "auto" */
1000 if (!strncmp(*symbol, "rfc", 3)) {
1001 bcopy(vm_rfc1048, hp->vm_cookie, 4);
1002 } else if (!strncmp(*symbol, "cmu", 3)) {
1003 bcopy(vm_cmu, hp->vm_cookie, 4);
1004 } else {
1005 if (!isdigit(**symbol))
1006 return E_BAD_IPADDR;
1007 if (prs_inetaddr(symbol, &value) < 0)
1008 return E_BAD_IPADDR;
1009 bcopy(&value, hp->vm_cookie, 4);
1010 }
1011 hp->flags.vm_cookie = TRUE;
1012 }
1013 }
1014 break;
1015
1016 case SYM_SIMILAR_ENTRY:
1017 switch (optype) {
1018 case OP_ADDITION:
1019 fill_defaults(hp, symbol);
1020 break;
1021 default:
1022 return E_SYNTAX_ERROR;
1023 }
1024 break;
1025
1026 case SYM_NAME_SWITCH:
1027 switch (optype) {
1028 case OP_ADDITION:
1029 return E_SYNTAX_ERROR;
1030 case OP_DELETION:
1031 hp->flags.send_name = FALSE;
1032 hp->flags.name_switch = FALSE;
1033 break;
1034 case OP_BOOLEAN:
1035 hp->flags.send_name = TRUE;
1036 hp->flags.name_switch = TRUE;
1037 break;
1038 }
1039 break;
1040
1041 case SYM_BOOTSIZE:
1042 switch (optype) {
1043 case OP_ADDITION:
1044 if (!strncmp(*symbol, "auto", 4)) {
1045 hp->flags.bootsize = TRUE;
1046 hp->flags.bootsize_auto = TRUE;
1047 } else {
1048 hp->bootsize = (unsigned int) get_u_long(symbol);
1049 hp->flags.bootsize = TRUE;
1050 hp->flags.bootsize_auto = FALSE;
1051 }
1052 break;
1053 case OP_DELETION:
1054 hp->flags.bootsize = FALSE;
1055 break;
1056 case OP_BOOLEAN:
1057 hp->flags.bootsize = TRUE;
1058 hp->flags.bootsize_auto = TRUE;
1059 break;
1060 }
1061 break;
1062
1063 case SYM_BOOT_SERVER:
1064 PARSE_IA1(bootserver);
1065 break;
1066
1067 case SYM_TFTPDIR:
1068 PARSE_STR(tftpdir);
1069 if ((hp->tftpdir != NULL) &&
1070 (hp->tftpdir->string[0] != '/'))
1071 return E_BAD_PATHNAME;
1072 break;
1073
1074 case SYM_DUMP_FILE:
1075 PARSE_STR(dump_file);
1076 break;
1077
1078 case SYM_DOMAIN_NAME:
1079 PARSE_STR(domain_name);
1080 break;
1081
1082 case SYM_SWAP_SERVER:
1083 PARSE_IA1(swap_server);
1084 break;
1085
1086 case SYM_ROOT_PATH:
1087 PARSE_STR(root_path);
1088 break;
1089
1090 case SYM_EXTEN_FILE:
1091 PARSE_STR(exten_file);
1092 break;
1093
1094 case SYM_REPLY_ADDR:
1095 PARSE_IA1(reply_addr);
1096 break;
1097
1098 case SYM_NIS_DOMAIN:
1099 PARSE_STR(nis_domain);
1100 break;
1101
1102 case SYM_NIS_SERVER:
1103 PARSE_IAL(nis_server);
1104 break;
1105
1106 case SYM_NTP_SERVER:
1107 PARSE_IAL(ntp_server);
1108 break;
1109
1110 #ifdef YORK_EX_OPTION
1111 case SYM_EXEC_FILE:
1112 PARSE_STR(exec_file);
1113 break;
1114 #endif
1115
1116 case SYM_MSG_SIZE:
1117 PARSE_UINT(msg_size);
1118 if (hp->msg_size < BP_MINPKTSZ ||
1119 hp->msg_size > MAX_MSG_SIZE)
1120 return E_BAD_VALUE;
1121 break;
1122
1123 case SYM_MIN_WAIT:
1124 PARSE_UINT(min_wait);
1125 break;
1126
1127 /* XXX - Add new tags here */
1128
1129 default:
1130 return E_UNKNOWN_SYMBOL;
1131
1132 } /* switch symbolcode */
1133
1134 return SUCCESS;
1135 }
1136 #undef PARSE_IA1
1137 #undef PARSE_IAL
1138 #undef PARSE_STR
1139
1140
1141
1142
1143 /*
1144 * Read a string from the buffer indirectly pointed to through "src" and
1145 * move it into the buffer pointed to by "dest". A pointer to the maximum
1146 * allowable length of the string (including null-terminator) is passed as
1147 * "length". The actual length of the string which was read is returned in
1148 * the unsigned integer pointed to by "length". This value is the same as
1149 * that which would be returned by applying the strlen() function on the
1150 * destination string (i.e the terminating null is not counted as a
1151 * character). Trailing whitespace is removed from the string. For
1152 * convenience, the function returns the new value of "dest".
1153 *
1154 * The string is read until the maximum number of characters, an unquoted
1155 * colon (:), or a null character is read. The return string in "dest" is
1156 * null-terminated.
1157 */
1158
1159 PRIVATE char *
get_string(src,dest,length)1160 get_string(src, dest, length)
1161 char **src, *dest;
1162 unsigned *length;
1163 {
1164 int n, len, quoteflag;
1165
1166 quoteflag = FALSE;
1167 n = 0;
1168 len = *length - 1;
1169 while ((n < len) && (**src)) {
1170 if (!quoteflag && (**src == ':')) {
1171 break;
1172 }
1173 if (**src == '"') {
1174 (*src)++;
1175 quoteflag = !quoteflag;
1176 continue;
1177 }
1178 if (**src == '\\') {
1179 (*src)++;
1180 if (!**src) {
1181 break;
1182 }
1183 }
1184 *dest++ = *(*src)++;
1185 n++;
1186 }
1187
1188 /*
1189 * Remove that troublesome trailing whitespace. . .
1190 */
1191 while ((n > 0) && isspace(dest[-1])) {
1192 dest--;
1193 n--;
1194 }
1195
1196 *dest = '\0';
1197 *length = n;
1198 return dest;
1199 }
1200
1201
1202
1203 /*
1204 * Read the string indirectly pointed to by "src", update the caller's
1205 * pointer, and return a pointer to a malloc'ed shared_string structure
1206 * containing the string.
1207 *
1208 * The string is read using the same rules as get_string() above.
1209 */
1210
1211 PRIVATE struct shared_string *
get_shared_string(src)1212 get_shared_string(src)
1213 char **src;
1214 {
1215 char retstring[MAXSTRINGLEN];
1216 struct shared_string *s;
1217 unsigned length;
1218
1219 length = sizeof(retstring);
1220 (void) get_string(src, retstring, &length);
1221
1222 s = (struct shared_string *) smalloc(sizeof(struct shared_string)
1223 + length);
1224 s->linkcount = 1;
1225 strcpy(s->string, retstring);
1226
1227 return s;
1228 }
1229
1230
1231
1232 /*
1233 * Load RFC1048 generic information directly into a memory buffer.
1234 *
1235 * "src" indirectly points to the ASCII representation of the generic data.
1236 * "dest" points to a string structure which is updated to point to a new
1237 * string with the new data appended to the old string. The old string is
1238 * freed.
1239 *
1240 * The given tag value is inserted with the new data.
1241 *
1242 * The data may be represented as either a stream of hexadecimal numbers
1243 * representing bytes (any or all bytes may optionally start with '0x' and
1244 * be separated with periods ".") or as a quoted string of ASCII
1245 * characters (the quotes are required).
1246 */
1247
1248 PRIVATE int
process_generic(src,dest,tagvalue)1249 process_generic(src, dest, tagvalue)
1250 char **src;
1251 struct shared_bindata **dest;
1252 u_int tagvalue;
1253 {
1254 byte tmpbuf[MAXBUFLEN];
1255 byte *str;
1256 struct shared_bindata *bdata;
1257 u_int newlength, oldlength;
1258
1259 str = tmpbuf;
1260 *str++ = (tagvalue & 0xFF); /* Store tag value */
1261 str++; /* Skip over length field */
1262 if ((*src)[0] == '"') { /* ASCII data */
1263 newlength = sizeof(tmpbuf) - 2; /* Set maximum allowed length */
1264 (void) get_string(src, (char *) str, &newlength);
1265 newlength++; /* null terminator */
1266 } else { /* Numeric data */
1267 newlength = 0;
1268 while (newlength < sizeof(tmpbuf) - 2) {
1269 if (interp_byte(src, str++) < 0)
1270 break;
1271 newlength++;
1272 if (**src == '.') {
1273 (*src)++;
1274 }
1275 }
1276 }
1277 if ((*src)[0] != ':')
1278 return -1;
1279
1280 tmpbuf[1] = (newlength & 0xFF);
1281 oldlength = ((*dest)->length);
1282 bdata = (struct shared_bindata *) smalloc(sizeof(struct shared_bindata)
1283 + oldlength + newlength + 1);
1284 if (oldlength > 0) {
1285 bcopy((*dest)->data, bdata->data, oldlength);
1286 }
1287 bcopy(tmpbuf, bdata->data + oldlength, newlength + 2);
1288 bdata->length = oldlength + newlength + 2;
1289 bdata->linkcount = 1;
1290 if (*dest) {
1291 del_bindata(*dest);
1292 }
1293 *dest = bdata;
1294 return 0;
1295 }
1296
1297
1298
1299 /*
1300 * Verify that the given string makes sense as a hostname (according to
1301 * Appendix 1, page 29 of RFC882).
1302 *
1303 * Return TRUE for good names, FALSE otherwise.
1304 */
1305
1306 PRIVATE boolean
goodname(hostname)1307 goodname(hostname)
1308 char *hostname;
1309 {
1310 do {
1311 if (!isalpha(*hostname++)) { /* First character must be a letter */
1312 return FALSE;
1313 }
1314 while (isalnum(*hostname) ||
1315 (*hostname == '-') ||
1316 (*hostname == '_') )
1317 {
1318 hostname++; /* Alphanumeric or a hyphen */
1319 }
1320 if (!isalnum(hostname[-1])) { /* Last must be alphanumeric */
1321 return FALSE;
1322 }
1323 if (*hostname == '\0') {/* Done? */
1324 return TRUE;
1325 }
1326 } while (*hostname++ == '.'); /* Dot, loop for next label */
1327
1328 return FALSE; /* If it's not a dot, lose */
1329 }
1330
1331
1332
1333 /*
1334 * Null compare function -- always returns FALSE so an element is always
1335 * inserted into a hash table (i.e. there is never a collision with an
1336 * existing element).
1337 */
1338
1339 PRIVATE boolean
nullcmp(d1,d2)1340 nullcmp(d1, d2)
1341 hash_datum *d1, *d2;
1342 {
1343 return FALSE;
1344 }
1345
1346
1347 /*
1348 * Function for comparing a string with the hostname field of a host
1349 * structure.
1350 */
1351
1352 boolean
nmcmp(d1,d2)1353 nmcmp(d1, d2)
1354 hash_datum *d1, *d2;
1355 {
1356 char *name = (char *) d1; /* XXX - OK? */
1357 struct host *hp = (struct host *) d2;
1358
1359 return !strcmp(name, hp->hostname->string);
1360 }
1361
1362
1363 /*
1364 * Compare function to determine whether two hardware addresses are
1365 * equivalent. Returns TRUE if "host1" and "host2" are equivalent, FALSE
1366 * otherwise.
1367 *
1368 * If the hardware addresses of "host1" and "host2" are identical, but
1369 * they are on different IP subnets, this function returns FALSE.
1370 *
1371 * This function is used when inserting elements into the hardware address
1372 * hash table.
1373 */
1374
1375 PRIVATE boolean
hwinscmp(d1,d2)1376 hwinscmp(d1, d2)
1377 hash_datum *d1, *d2;
1378 {
1379 struct host *host1 = (struct host *) d1;
1380 struct host *host2 = (struct host *) d2;
1381
1382 if (host1->htype != host2->htype) {
1383 return FALSE;
1384 }
1385 if (bcmp(host1->haddr, host2->haddr, haddrlength(host1->htype))) {
1386 return FALSE;
1387 }
1388 /* XXX - Is the subnet_mask field set yet? */
1389 if ((host1->subnet_mask.s_addr) == (host2->subnet_mask.s_addr)) {
1390 if (((host1->iaddr.s_addr) & (host1->subnet_mask.s_addr)) !=
1391 ((host2->iaddr.s_addr) & (host2->subnet_mask.s_addr)))
1392 {
1393 return FALSE;
1394 }
1395 }
1396 return TRUE;
1397 }
1398
1399
1400 /*
1401 * Macros for use in the function below:
1402 */
1403
1404 #define DUP_COPY(MEMBER) do \
1405 { \
1406 if (!hp->flags.MEMBER) { \
1407 if ((hp->flags.MEMBER = hp2->flags.MEMBER) != 0) { \
1408 hp->MEMBER = hp2->MEMBER; \
1409 } \
1410 } \
1411 } while (0)
1412
1413 #define DUP_LINK(MEMBER) do \
1414 { \
1415 if (!hp->flags.MEMBER) { \
1416 if ((hp->flags.MEMBER = hp2->flags.MEMBER) != 0) { \
1417 assert(hp2->MEMBER); \
1418 hp->MEMBER = hp2->MEMBER; \
1419 (hp->MEMBER->linkcount)++; \
1420 } \
1421 } \
1422 } while (0)
1423
1424 /*
1425 * Process the "similar entry" symbol.
1426 *
1427 * The host specified as the value of the "tc" symbol is used as a template
1428 * for the current host entry. Symbol values not explicitly set in the
1429 * current host entry are inferred from the template entry.
1430 */
1431 PRIVATE void
fill_defaults(hp,src)1432 fill_defaults(hp, src)
1433 struct host *hp;
1434 char **src;
1435 {
1436 unsigned int tlen, hashcode;
1437 struct host *hp2;
1438 char tstring[MAXSTRINGLEN];
1439
1440 tlen = sizeof(tstring);
1441 (void) get_string(src, tstring, &tlen);
1442 hashcode = hash_HashFunction((u_char *) tstring, tlen);
1443 hp2 = (struct host *) hash_Lookup(nmhashtable, hashcode, nmcmp, tstring);
1444
1445 if (hp2 == NULL) {
1446 report(LOG_ERR, "can't find tc=\"%s\"", tstring);
1447 return;
1448 }
1449 DUP_LINK(bootfile);
1450 DUP_LINK(cookie_server);
1451 DUP_LINK(domain_server);
1452 DUP_LINK(gateway);
1453 /* haddr not copied */
1454 DUP_LINK(homedir);
1455 DUP_COPY(htype);
1456
1457 DUP_LINK(impress_server);
1458 /* iaddr not copied */
1459 DUP_LINK(log_server);
1460 DUP_LINK(lpr_server);
1461 DUP_LINK(name_server);
1462 DUP_LINK(rlp_server);
1463
1464 DUP_COPY(subnet_mask);
1465 DUP_COPY(time_offset);
1466 DUP_LINK(time_server);
1467
1468 if (!hp->flags.vm_cookie) {
1469 if ((hp->flags.vm_cookie = hp2->flags.vm_cookie)) {
1470 bcopy(hp2->vm_cookie, hp->vm_cookie, 4);
1471 }
1472 }
1473 if (!hp->flags.name_switch) {
1474 if ((hp->flags.name_switch = hp2->flags.name_switch)) {
1475 hp->flags.send_name = hp2->flags.send_name;
1476 }
1477 }
1478 if (!hp->flags.bootsize) {
1479 if ((hp->flags.bootsize = hp2->flags.bootsize)) {
1480 hp->flags.bootsize_auto = hp2->flags.bootsize_auto;
1481 hp->bootsize = hp2->bootsize;
1482 }
1483 }
1484 DUP_COPY(bootserver);
1485
1486 DUP_LINK(tftpdir);
1487 DUP_LINK(dump_file);
1488 DUP_LINK(domain_name);
1489
1490 DUP_COPY(swap_server);
1491 DUP_LINK(root_path);
1492 DUP_LINK(exten_file);
1493
1494 DUP_COPY(reply_addr);
1495
1496 DUP_LINK(nis_domain);
1497 DUP_LINK(nis_server);
1498 DUP_LINK(ntp_server);
1499
1500 #ifdef YORK_EX_OPTION
1501 DUP_LINK(exec_file);
1502 #endif
1503
1504 DUP_COPY(msg_size);
1505 DUP_COPY(min_wait);
1506
1507 /* XXX - Add new tags here */
1508
1509 DUP_LINK(generic);
1510
1511 }
1512 #undef DUP_COPY
1513 #undef DUP_LINK
1514
1515
1516
1517 /*
1518 * This function adjusts the caller's pointer to point just past the
1519 * first-encountered colon. If it runs into a null character, it leaves
1520 * the pointer pointing to it.
1521 */
1522
1523 PRIVATE void
adjust(s)1524 adjust(s)
1525 char **s;
1526 {
1527 char *t;
1528
1529 t = *s;
1530 while (*t && (*t != ':')) {
1531 t++;
1532 }
1533 if (*t) {
1534 t++;
1535 }
1536 *s = t;
1537 }
1538
1539
1540
1541
1542 /*
1543 * This function adjusts the caller's pointer to point to the first
1544 * non-whitespace character. If it runs into a null character, it leaves
1545 * the pointer pointing to it.
1546 */
1547
1548 PRIVATE void
eat_whitespace(s)1549 eat_whitespace(s)
1550 char **s;
1551 {
1552 char *t;
1553
1554 t = *s;
1555 while (*t && isspace(*t)) {
1556 t++;
1557 }
1558 *s = t;
1559 }
1560
1561
1562
1563 /*
1564 * This function converts the given string to all lowercase.
1565 */
1566
1567 PRIVATE void
makelower(s)1568 makelower(s)
1569 char *s;
1570 {
1571 while (*s) {
1572 if (isupper(*s)) {
1573 *s = tolower(*s);
1574 }
1575 s++;
1576 }
1577 }
1578
1579
1580
1581 /*
1582 *
1583 * N O T E :
1584 *
1585 * In many of the functions which follow, a parameter such as "src" or
1586 * "symbol" is passed as a pointer to a pointer to something. This is
1587 * done for the purpose of letting the called function update the
1588 * caller's copy of the parameter (i.e. to effect call-by-reference
1589 * parameter passing). The value of the actual parameter is only used
1590 * to locate the real parameter of interest and then update this indirect
1591 * parameter.
1592 *
1593 * I'm sure somebody out there won't like this. . . .
1594 * (Yea, because it usually makes code slower... -gwr)
1595 *
1596 */
1597
1598
1599
1600 /*
1601 * "src" points to a character pointer which points to an ASCII string of
1602 * whitespace-separated IP addresses. A pointer to an in_addr_list
1603 * structure containing the list of addresses is returned. NULL is
1604 * returned if no addresses were found at all. The pointer pointed to by
1605 * "src" is updated to point to the first non-address (illegal) character.
1606 */
1607
1608 PRIVATE struct in_addr_list *
get_addresses(src)1609 get_addresses(src)
1610 char **src;
1611 {
1612 struct in_addr tmpaddrlist[MAXINADDRS];
1613 struct in_addr *address1, *address2;
1614 struct in_addr_list *result;
1615 unsigned addrcount, totalsize;
1616
1617 address1 = tmpaddrlist;
1618 for (addrcount = 0; addrcount < MAXINADDRS; addrcount++) {
1619 while (isspace(**src) || (**src == ',')) {
1620 (*src)++;
1621 }
1622 if (!**src) { /* Quit if nothing more */
1623 break;
1624 }
1625 if (prs_inetaddr(src, &(address1->s_addr)) < 0) {
1626 break;
1627 }
1628 address1++; /* Point to next address slot */
1629 }
1630 if (addrcount < 1) {
1631 result = NULL;
1632 } else {
1633 totalsize = sizeof(struct in_addr_list)
1634 + (addrcount - 1) * sizeof(struct in_addr);
1635 result = (struct in_addr_list *) smalloc(totalsize);
1636 result->linkcount = 1;
1637 result->addrcount = addrcount;
1638 address1 = tmpaddrlist;
1639 address2 = result->addr;
1640 for (; addrcount > 0; addrcount--) {
1641 address2->s_addr = address1->s_addr;
1642 address1++;
1643 address2++;
1644 }
1645 }
1646 return result;
1647 }
1648
1649
1650
1651 /*
1652 * prs_inetaddr(src, result)
1653 *
1654 * "src" is a value-result parameter; the pointer it points to is updated
1655 * to point to the next data position. "result" points to an unsigned long
1656 * in which an address is returned.
1657 *
1658 * This function parses the IP address string in ASCII "dot notation" pointed
1659 * to by (*src) and places the result (in network byte order) in the unsigned
1660 * long pointed to by "result". For malformed addresses, -1 is returned,
1661 * (*src) points to the first illegal character, and the unsigned long pointed
1662 * to by "result" is unchanged. Successful calls return 0.
1663 */
1664
1665 PRIVATE int
prs_inetaddr(src,result)1666 prs_inetaddr(src, result)
1667 char **src;
1668 u_int32 *result;
1669 {
1670 char tmpstr[MAXSTRINGLEN];
1671 u_int32 value;
1672 u_int32 parts[4], *pp;
1673 int n;
1674 char *s, *t;
1675
1676 /* Leading alpha char causes IP addr lookup. */
1677 if (isalpha(**src)) {
1678 /* Lookup IP address. */
1679 s = *src;
1680 t = tmpstr;
1681 while ((isalnum(*s) || (*s == '.') ||
1682 (*s == '-') || (*s == '_') ) &&
1683 (t < &tmpstr[MAXSTRINGLEN - 1]) )
1684 *t++ = *s++;
1685 *t = '\0';
1686 *src = s;
1687
1688 n = lookup_ipa(tmpstr, result);
1689 if (n < 0)
1690 report(LOG_ERR, "can not get IP addr for %s", tmpstr);
1691 return n;
1692 }
1693
1694 /*
1695 * Parse an address in Internet format:
1696 * a.b.c.d
1697 * a.b.c (with c treated as 16-bits)
1698 * a.b (with b treated as 24 bits)
1699 */
1700 pp = parts;
1701 loop:
1702 /* If it's not a digit, return error. */
1703 if (!isdigit(**src))
1704 return -1;
1705 *pp++ = get_u_long(src);
1706 if (**src == '.') {
1707 if (pp < (parts + 4)) {
1708 (*src)++;
1709 goto loop;
1710 }
1711 return (-1);
1712 }
1713 #if 0
1714 /* This is handled by the caller. */
1715 if (**src && !(isspace(**src) || (**src == ':'))) {
1716 return (-1);
1717 }
1718 #endif
1719
1720 /*
1721 * Construct the address according to
1722 * the number of parts specified.
1723 */
1724 n = pp - parts;
1725 switch (n) {
1726 case 1: /* a -- 32 bits */
1727 value = parts[0];
1728 break;
1729 case 2: /* a.b -- 8.24 bits */
1730 value = (parts[0] << 24) | (parts[1] & 0xFFFFFF);
1731 break;
1732 case 3: /* a.b.c -- 8.8.16 bits */
1733 value = (parts[0] << 24) | ((parts[1] & 0xFF) << 16) |
1734 (parts[2] & 0xFFFF);
1735 break;
1736 case 4: /* a.b.c.d -- 8.8.8.8 bits */
1737 value = (parts[0] << 24) | ((parts[1] & 0xFF) << 16) |
1738 ((parts[2] & 0xFF) << 8) | (parts[3] & 0xFF);
1739 break;
1740 default:
1741 return (-1);
1742 }
1743 *result = htonl(value);
1744 return (0);
1745 }
1746
1747
1748
1749 /*
1750 * "src" points to a pointer which in turn points to a hexadecimal ASCII
1751 * string. This string is interpreted as a hardware address and returned
1752 * as a pointer to the actual hardware address, represented as an array of
1753 * bytes.
1754 *
1755 * The ASCII string must have the proper number of digits for the specified
1756 * hardware type (e.g. twelve digits for a 48-bit Ethernet address).
1757 * Two-digit sequences (bytes) may be separated with periods (.) and/or
1758 * prefixed with '0x' for readability, but this is not required.
1759 *
1760 * For bad addresses, the pointer which "src" points to is updated to point
1761 * to the start of the first two-digit sequence which was bad, and the
1762 * function returns a NULL pointer.
1763 */
1764
1765 PRIVATE byte *
prs_haddr(src,htype)1766 prs_haddr(src, htype)
1767 char **src;
1768 u_int htype;
1769 {
1770 static byte haddr[MAXHADDRLEN];
1771 byte *hap;
1772 char tmpstr[MAXSTRINGLEN];
1773 u_int tmplen;
1774 unsigned hal;
1775 char *p;
1776
1777 hal = haddrlength(htype); /* Get length of this address type */
1778 if (hal <= 0) {
1779 report(LOG_ERR, "Invalid addr type for HW addr parse");
1780 return NULL;
1781 }
1782 tmplen = sizeof(tmpstr);
1783 get_string(src, tmpstr, &tmplen);
1784 p = tmpstr;
1785
1786 /* If it's a valid host name, try to lookup the HW address. */
1787 if (goodname(p)) {
1788 /* Lookup Hardware Address for hostname. */
1789 if ((hap = lookup_hwa(p, htype)) != NULL)
1790 return hap; /* success */
1791 report(LOG_ERR, "Add 0x prefix if hex value starts with A-F");
1792 /* OK, assume it must be numeric. */
1793 }
1794
1795 hap = haddr;
1796 while (hap < haddr + hal) {
1797 if ((*p == '.') || (*p == ':'))
1798 p++;
1799 if (interp_byte(&p, hap++) < 0) {
1800 return NULL;
1801 }
1802 }
1803 return haddr;
1804 }
1805
1806
1807
1808 /*
1809 * "src" is a pointer to a character pointer which in turn points to a
1810 * hexadecimal ASCII representation of a byte. This byte is read, the
1811 * character pointer is updated, and the result is deposited into the
1812 * byte pointed to by "retbyte".
1813 *
1814 * The usual '0x' notation is allowed but not required. The number must be
1815 * a two digit hexadecimal number. If the number is invalid, "src" and
1816 * "retbyte" are left untouched and -1 is returned as the function value.
1817 * Successful calls return 0.
1818 */
1819
1820 PRIVATE int
interp_byte(src,retbyte)1821 interp_byte(src, retbyte)
1822 char **src;
1823 byte *retbyte;
1824 {
1825 int v;
1826
1827 if ((*src)[0] == '0' &&
1828 ((*src)[1] == 'x' ||
1829 (*src)[1] == 'X')) {
1830 (*src) += 2; /* allow 0x for hex, but don't require it */
1831 }
1832 if (!isxdigit((*src)[0]) || !isxdigit((*src)[1])) {
1833 return -1;
1834 }
1835 if (sscanf(*src, "%2x", &v) != 1) {
1836 return -1;
1837 }
1838 (*src) += 2;
1839 *retbyte = (byte) (v & 0xFF);
1840 return 0;
1841 }
1842
1843
1844
1845 /*
1846 * The parameter "src" points to a character pointer which points to an
1847 * ASCII string representation of an unsigned number. The number is
1848 * returned as an unsigned long and the character pointer is updated to
1849 * point to the first illegal character.
1850 */
1851
1852 PRIVATE u_int32
get_u_long(src)1853 get_u_long(src)
1854 char **src;
1855 {
1856 u_int32 value, base;
1857 char c;
1858
1859 /*
1860 * Collect number up to first illegal character. Values are specified
1861 * as for C: 0x=hex, 0=octal, other=decimal.
1862 */
1863 value = 0;
1864 base = 10;
1865 if (**src == '0') {
1866 base = 8;
1867 (*src)++;
1868 }
1869 if (**src == 'x' || **src == 'X') {
1870 base = 16;
1871 (*src)++;
1872 }
1873 while ((c = **src)) {
1874 if (isdigit(c)) {
1875 value = (value * base) + (c - '0');
1876 (*src)++;
1877 continue;
1878 }
1879 if (base == 16 && isxdigit(c)) {
1880 value = (value << 4) + ((c & ~32) + 10 - 'A');
1881 (*src)++;
1882 continue;
1883 }
1884 break;
1885 }
1886 return value;
1887 }
1888
1889
1890
1891 /*
1892 * Routines for deletion of data associated with the main data structure.
1893 */
1894
1895
1896 /*
1897 * Frees the entire host data structure given. Does nothing if the passed
1898 * pointer is NULL.
1899 */
1900
1901 PRIVATE void
free_host(hmp)1902 free_host(hmp)
1903 hash_datum *hmp;
1904 {
1905 struct host *hostptr = (struct host *) hmp;
1906 if (hostptr == NULL)
1907 return;
1908 assert(hostptr->linkcount > 0);
1909 if (--(hostptr->linkcount))
1910 return; /* Still has references */
1911 del_iplist(hostptr->cookie_server);
1912 del_iplist(hostptr->domain_server);
1913 del_iplist(hostptr->gateway);
1914 del_iplist(hostptr->impress_server);
1915 del_iplist(hostptr->log_server);
1916 del_iplist(hostptr->lpr_server);
1917 del_iplist(hostptr->name_server);
1918 del_iplist(hostptr->rlp_server);
1919 del_iplist(hostptr->time_server);
1920 del_iplist(hostptr->nis_server);
1921 del_iplist(hostptr->ntp_server);
1922
1923 /*
1924 * XXX - Add new tags here
1925 * (if the value is an IP list)
1926 */
1927
1928 del_string(hostptr->hostname);
1929 del_string(hostptr->homedir);
1930 del_string(hostptr->bootfile);
1931 del_string(hostptr->tftpdir);
1932 del_string(hostptr->root_path);
1933 del_string(hostptr->domain_name);
1934 del_string(hostptr->dump_file);
1935 del_string(hostptr->exten_file);
1936 del_string(hostptr->nis_domain);
1937
1938 #ifdef YORK_EX_OPTION
1939 del_string(hostptr->exec_file);
1940 #endif
1941
1942 /*
1943 * XXX - Add new tags here
1944 * (if it is a shared string)
1945 */
1946
1947 del_bindata(hostptr->generic);
1948 free((char *) hostptr);
1949 }
1950
1951
1952
1953 /*
1954 * Decrements the linkcount on the given IP address data structure. If the
1955 * linkcount goes to zero, the memory associated with the data is freed.
1956 */
1957
1958 PRIVATE void
del_iplist(iplist)1959 del_iplist(iplist)
1960 struct in_addr_list *iplist;
1961 {
1962 if (iplist) {
1963 if (!(--(iplist->linkcount))) {
1964 free((char *) iplist);
1965 }
1966 }
1967 }
1968
1969
1970
1971 /*
1972 * Decrements the linkcount on a string data structure. If the count
1973 * goes to zero, the memory associated with the string is freed. Does
1974 * nothing if the passed pointer is NULL.
1975 */
1976
1977 PRIVATE void
del_string(stringptr)1978 del_string(stringptr)
1979 struct shared_string *stringptr;
1980 {
1981 if (stringptr) {
1982 if (!(--(stringptr->linkcount))) {
1983 free((char *) stringptr);
1984 }
1985 }
1986 }
1987
1988
1989
1990 /*
1991 * Decrements the linkcount on a shared_bindata data structure. If the
1992 * count goes to zero, the memory associated with the data is freed. Does
1993 * nothing if the passed pointer is NULL.
1994 */
1995
1996 PRIVATE void
del_bindata(dataptr)1997 del_bindata(dataptr)
1998 struct shared_bindata *dataptr;
1999 {
2000 if (dataptr) {
2001 if (!(--(dataptr->linkcount))) {
2002 free((char *) dataptr);
2003 }
2004 }
2005 }
2006
2007
2008
2009
2010 /* smalloc() -- safe malloc()
2011 *
2012 * Always returns a valid pointer (if it returns at all). The allocated
2013 * memory is initialized to all zeros. If malloc() returns an error, a
2014 * message is printed using the report() function and the program aborts
2015 * with a status of 1.
2016 */
2017
2018 PRIVATE char *
smalloc(nbytes)2019 smalloc(nbytes)
2020 unsigned nbytes;
2021 {
2022 char *retvalue;
2023
2024 retvalue = malloc(nbytes);
2025 if (!retvalue) {
2026 report(LOG_ERR, "malloc() failure -- exiting");
2027 exit(1);
2028 }
2029 bzero(retvalue, nbytes);
2030 return retvalue;
2031 }
2032
2033
2034 /*
2035 * Compare function to determine whether two hardware addresses are
2036 * equivalent. Returns TRUE if "host1" and "host2" are equivalent, FALSE
2037 * otherwise.
2038 *
2039 * This function is used when retrieving elements from the hardware address
2040 * hash table.
2041 */
2042
2043 boolean
hwlookcmp(d1,d2)2044 hwlookcmp(d1, d2)
2045 hash_datum *d1, *d2;
2046 {
2047 struct host *host1 = (struct host *) d1;
2048 struct host *host2 = (struct host *) d2;
2049
2050 if (host1->htype != host2->htype) {
2051 return FALSE;
2052 }
2053 if (bcmp(host1->haddr, host2->haddr, haddrlength(host1->htype))) {
2054 return FALSE;
2055 }
2056 return TRUE;
2057 }
2058
2059
2060 /*
2061 * Compare function for doing IP address hash table lookup.
2062 */
2063
2064 boolean
iplookcmp(d1,d2)2065 iplookcmp(d1, d2)
2066 hash_datum *d1, *d2;
2067 {
2068 struct host *host1 = (struct host *) d1;
2069 struct host *host2 = (struct host *) d2;
2070
2071 return (host1->iaddr.s_addr == host2->iaddr.s_addr);
2072 }
2073
2074 /*
2075 * Local Variables:
2076 * tab-width: 4
2077 * c-indent-level: 4
2078 * c-argdecl-indent: 4
2079 * c-continued-statement-offset: 4
2080 * c-continued-brace-offset: -4
2081 * c-label-offset: -4
2082 * c-brace-offset: 0
2083 * End:
2084 */
2085