Commit | Line | Data |
---|---|---|
15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1985,1989 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)subr.c 5.24 (Berkeley) 3/2/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | ******************************************************************************* | |
40 | * | |
41 | * subr.c -- | |
42 | * | |
43 | * Miscellaneous subroutines for the name server | |
44 | * lookup program. | |
45 | * | |
46 | * Copyright (c) 1985 | |
47 | * Andrew Cherenson | |
48 | * U.C. Berkeley | |
49 | * CS298-26 Fall 1985 | |
50 | * | |
51 | ******************************************************************************* | |
52 | */ | |
53 | ||
54 | #include <sys/types.h> | |
55 | #include <sys/param.h> | |
56 | #include <netdb.h> | |
57 | #include <sys/socket.h> | |
58 | #include <netinet/in.h> | |
59 | #include <arpa/nameser.h> | |
60 | #include <arpa/inet.h> | |
61 | #include <signal.h> | |
62 | #include <setjmp.h> | |
63 | #include <stdio.h> | |
64 | #include <stdlib.h> | |
65 | #include <string.h> | |
66 | #include "res.h" | |
67 | ||
68 | ||
69 | \f | |
70 | /* | |
71 | ******************************************************************************* | |
72 | * | |
73 | * IntrHandler -- | |
74 | * | |
75 | * This routine is called whenever a control-C is typed. | |
76 | * It performs three main functions: | |
77 | * - closes an open socket connection, | |
78 | * - closes an open output file (used by LookupHost, et al.), | |
79 | * - jumps back to the main read-eval loop. | |
80 | * | |
81 | * If a user types a ^C in the middle of a routine that uses a socket, | |
82 | * the routine would not be able to close the socket. To prevent an | |
83 | * overflow of the process's open file table, the socket and output | |
84 | * file descriptors are closed by the interrupt handler. | |
85 | * | |
86 | * Side effects: | |
87 | * Open file descriptors are closed. | |
88 | * If filePtr is valid, it is closed. | |
89 | * Flow of control returns to the main() routine. | |
90 | * | |
91 | ******************************************************************************* | |
92 | */ | |
93 | ||
94 | void | |
95 | IntrHandler() | |
96 | { | |
97 | extern jmp_buf env; | |
98 | #if defined(BSD) && BSD >= 199006 | |
99 | extern FILE *yyin; /* scanner input file */ | |
100 | extern void yyrestart(); /* routine to restart scanner after interrupt */ | |
101 | #endif | |
102 | ||
103 | SendRequest_close(); | |
104 | ListHost_close(); | |
105 | if (filePtr != NULL && filePtr != stdout) { | |
106 | fclose(filePtr); | |
107 | filePtr = NULL; | |
108 | } | |
109 | printf("\n"); | |
110 | #if defined(BSD) && BSD >= 199006 | |
111 | yyrestart(yyin); | |
112 | #endif | |
113 | longjmp(env, 1); | |
114 | } | |
115 | \f | |
116 | ||
117 | /* | |
118 | ******************************************************************************* | |
119 | * | |
120 | * Malloc -- | |
121 | * Calloc -- | |
122 | * | |
123 | * Calls the malloc library routine with SIGINT blocked to prevent | |
124 | * corruption of malloc's data structures. We need to do this because | |
125 | * a control-C doesn't kill the program -- it causes a return to the | |
126 | * main command loop. | |
127 | * | |
128 | * NOTE: This method doesn't prevent the pointer returned by malloc | |
129 | * from getting lost, so it is possible to get "core leaks". | |
130 | * | |
131 | * If malloc fails, the program exits. | |
132 | * | |
133 | * Results: | |
134 | * (address) - address of new buffer. | |
135 | * | |
136 | ******************************************************************************* | |
137 | */ | |
138 | ||
139 | char * | |
140 | Malloc(size) | |
141 | int size; | |
142 | { | |
143 | char *ptr; | |
144 | ||
145 | #ifdef SYSV | |
146 | #ifdef SVR3 | |
147 | sighold(SIGINT); | |
148 | ptr = malloc((unsigned) size); | |
149 | sigrelse(SIGINT); | |
150 | #else | |
151 | { int (*old)(); | |
152 | old = signal(SIGINT, SIG_IGN); | |
153 | ptr = malloc((unsigned) size); | |
154 | signal(SIGINT, old); | |
155 | } | |
156 | #endif | |
157 | #else | |
158 | { int saveMask; | |
159 | saveMask = sigblock(sigmask(SIGINT)); | |
160 | ptr = malloc((unsigned) size); | |
161 | (void) sigsetmask(saveMask); | |
162 | } | |
163 | #endif | |
164 | if (ptr == NULL) { | |
165 | fflush(stdout); | |
166 | fprintf(stderr, "*** Can't allocate memory\n"); | |
167 | fflush(stderr); | |
168 | abort(); | |
169 | /*NOTREACHED*/ | |
170 | } else { | |
171 | return(ptr); | |
172 | } | |
173 | } | |
174 | ||
175 | char * | |
176 | Calloc(num, size) | |
177 | register int num, size; | |
178 | { | |
179 | char *ptr = Malloc(num*size); | |
180 | bzero(ptr, num*size); | |
181 | return(ptr); | |
182 | } | |
183 | ||
184 | \f | |
185 | /* | |
186 | ******************************************************************************* | |
187 | * | |
188 | * PrintHostInfo -- | |
189 | * | |
190 | * Prints out the HostInfo structure for a host. | |
191 | * | |
192 | ******************************************************************************* | |
193 | */ | |
194 | ||
195 | void | |
196 | PrintHostInfo(file, title, hp) | |
197 | FILE *file; | |
198 | char *title; | |
199 | register HostInfo *hp; | |
200 | { | |
201 | register char **cp; | |
202 | register ServerInfo **sp; | |
203 | char comma; | |
204 | int i; | |
205 | ||
206 | fprintf(file, "%-7s %s", title, hp->name); | |
207 | ||
208 | if (hp->addrList != NULL) { | |
209 | if (hp->addrList[1] != NULL) { | |
210 | fprintf(file, "\nAddresses:"); | |
211 | } else { | |
212 | fprintf(file, "\nAddress:"); | |
213 | } | |
214 | comma = ' '; | |
215 | i = 0; | |
216 | for (cp = hp->addrList; cp && *cp; cp++) { | |
217 | i++; | |
218 | if (i > 4) { | |
219 | fprintf(file, "\n\t"); | |
220 | comma = ' '; | |
221 | i = 0; | |
222 | } | |
223 | fprintf(file,"%c %s", comma, inet_ntoa(*(struct in_addr *)*cp)); | |
224 | comma = ','; | |
225 | } | |
226 | } | |
227 | ||
228 | if (hp->aliases != NULL) { | |
229 | fprintf(file, "\nAliases:"); | |
230 | comma = ' '; | |
231 | i = 10; | |
232 | for (cp = hp->aliases; cp && *cp && **cp; cp++) { | |
233 | i += strlen(*cp) + 2; | |
234 | if (i > 75) { | |
235 | fprintf(file, "\n\t"); | |
236 | comma = ' '; | |
237 | i = 10; | |
238 | } | |
239 | fprintf(file, "%c %s", comma, *cp); | |
240 | comma = ','; | |
241 | } | |
242 | } | |
243 | ||
244 | if (hp->servers != NULL) { | |
245 | fprintf(file, "\nServed by:\n"); | |
246 | for (sp = hp->servers; *sp != NULL ; sp++) { | |
247 | ||
248 | fprintf(file, "- %s\n\t", (*sp)->name); | |
249 | ||
250 | comma = ' '; | |
251 | i = 0; | |
252 | for (cp = (*sp)->addrList; cp && *cp && **cp; cp++) { | |
253 | i++; | |
254 | if (i > 4) { | |
255 | fprintf(file, "\n\t"); | |
256 | comma = ' '; | |
257 | i = 0; | |
258 | } | |
259 | fprintf(file, | |
260 | "%c %s", comma, inet_ntoa(*(struct in_addr *)*cp)); | |
261 | comma = ','; | |
262 | } | |
263 | fprintf(file, "\n\t"); | |
264 | ||
265 | comma = ' '; | |
266 | i = 10; | |
267 | for (cp = (*sp)->domains; cp && *cp && **cp; cp++) { | |
268 | i += strlen(*cp) + 2; | |
269 | if (i > 75) { | |
270 | fprintf(file, "\n\t"); | |
271 | comma = ' '; | |
272 | i = 10; | |
273 | } | |
274 | fprintf(file, "%c %s", comma, *cp); | |
275 | comma = ','; | |
276 | } | |
277 | fprintf(file, "\n"); | |
278 | } | |
279 | } | |
280 | ||
281 | fprintf(file, "\n\n"); | |
282 | } | |
283 | \f | |
284 | /* | |
285 | ******************************************************************************* | |
286 | * | |
287 | * OpenFile -- | |
288 | * | |
289 | * Parses a command string for a file name and opens | |
290 | * the file. | |
291 | * | |
292 | * Results: | |
293 | * file pointer - the open was successful. | |
294 | * NULL - there was an error opening the file or | |
295 | * the input string was invalid. | |
296 | * | |
297 | ******************************************************************************* | |
298 | */ | |
299 | ||
300 | FILE * | |
301 | OpenFile(string, file) | |
302 | char *string; | |
303 | char *file; | |
304 | { | |
305 | char *redirect; | |
306 | FILE *tmpPtr; | |
307 | ||
308 | /* | |
309 | * Open an output file if we see '>' or >>'. | |
310 | * Check for overwrite (">") or concatenation (">>"). | |
311 | */ | |
312 | ||
313 | redirect = strchr(string, '>'); | |
314 | if (redirect == NULL) { | |
315 | return(NULL); | |
316 | } | |
317 | if (redirect[1] == '>') { | |
318 | sscanf(redirect, ">> %s", file); | |
319 | tmpPtr = fopen(file, "a+"); | |
320 | } else { | |
321 | sscanf(redirect, "> %s", file); | |
322 | tmpPtr = fopen(file, "w"); | |
323 | } | |
324 | ||
325 | if (tmpPtr != NULL) { | |
326 | redirect[0] = '\0'; | |
327 | } | |
328 | ||
329 | return(tmpPtr); | |
330 | } | |
331 | \f | |
332 | /* | |
333 | ******************************************************************************* | |
334 | * | |
335 | * DecodeError -- | |
336 | * | |
337 | * Converts an error code into a character string. | |
338 | * | |
339 | ******************************************************************************* | |
340 | */ | |
341 | ||
342 | char * | |
343 | DecodeError(result) | |
344 | int result; | |
345 | { | |
346 | switch (result) { | |
347 | case NOERROR: return("Success"); break; | |
348 | case FORMERR: return("Format error"); break; | |
349 | case SERVFAIL: return("Server failed"); break; | |
350 | case NXDOMAIN: return("Non-existent domain"); break; | |
351 | case NOTIMP: return("Not implemented"); break; | |
352 | case REFUSED: return("Query refused"); break; | |
353 | case NOCHANGE: return("No change"); break; | |
354 | case TIME_OUT: return("Timed out"); break; | |
355 | case NO_INFO: return("No information"); break; | |
356 | case ERROR: return("Unspecified error"); break; | |
357 | case NONAUTH: return("Non-authoritative answer"); break; | |
358 | case NO_RESPONSE: return("No response from server"); break; | |
359 | default: break; | |
360 | } | |
361 | return("BAD ERROR VALUE"); | |
362 | } | |
363 | \f | |
364 | ||
365 | int | |
366 | StringToClass(class, dflt) | |
367 | char *class; | |
368 | int dflt; | |
369 | { | |
370 | if (strcasecmp(class, "IN") == 0) | |
371 | return(C_IN); | |
372 | if (strcasecmp(class, "HESIOD") == 0 || | |
373 | strcasecmp(class, "HS") == 0) | |
374 | return(C_HS); | |
375 | if (strcasecmp(class, "CHAOS") == 0) | |
376 | return(C_CHAOS); | |
377 | if (strcasecmp(class, "ANY") == 0) | |
378 | return(C_ANY); | |
379 | fprintf(stderr, "unknown query class: %s\n", class); | |
380 | return(dflt); | |
381 | } | |
382 | \f | |
383 | ||
384 | /* | |
385 | ******************************************************************************* | |
386 | * | |
387 | * StringToType -- | |
388 | * | |
389 | * Converts a string form of a query type name to its | |
390 | * corresponding integer value. | |
391 | * | |
392 | ******************************************************************************* | |
393 | */ | |
394 | ||
395 | int | |
396 | StringToType(type, dflt) | |
397 | char *type; | |
398 | int dflt; | |
399 | { | |
400 | if (strcasecmp(type, "A") == 0) | |
401 | return(T_A); | |
402 | if (strcasecmp(type, "NS") == 0) | |
403 | return(T_NS); /* authoritative server */ | |
404 | if (strcasecmp(type, "MX") == 0) | |
405 | return(T_MX); /* mail exchanger */ | |
406 | if (strcasecmp(type, "CNAME") == 0) | |
407 | return(T_CNAME); /* canonical name */ | |
408 | if (strcasecmp(type, "SOA") == 0) | |
409 | return(T_SOA); /* start of authority zone */ | |
410 | if (strcasecmp(type, "MB") == 0) | |
411 | return(T_MB); /* mailbox domain name */ | |
412 | if (strcasecmp(type, "MG") == 0) | |
413 | return(T_MG); /* mail group member */ | |
414 | if (strcasecmp(type, "MR") == 0) | |
415 | return(T_MR); /* mail rename name */ | |
416 | if (strcasecmp(type, "WKS") == 0) | |
417 | return(T_WKS); /* well known service */ | |
418 | if (strcasecmp(type, "PTR") == 0) | |
419 | return(T_PTR); /* domain name pointer */ | |
420 | if (strcasecmp(type, "HINFO") == 0) | |
421 | return(T_HINFO); /* host information */ | |
422 | if (strcasecmp(type, "MINFO") == 0) | |
423 | return(T_MINFO); /* mailbox information */ | |
424 | if (strcasecmp(type, "AXFR") == 0) | |
425 | return(T_AXFR); /* zone transfer */ | |
426 | if (strcasecmp(type, "MAILA") == 0) | |
427 | return(T_MAILA); /* mail agent */ | |
428 | if (strcasecmp(type, "MAILB") == 0) | |
429 | return(T_MAILB); /* mail box */ | |
430 | if (strcasecmp(type, "ANY") == 0) | |
431 | return(T_ANY); /* matches any type */ | |
432 | if (strcasecmp(type, "UINFO") == 0) | |
433 | return(T_UINFO); /* user info */ | |
434 | if (strcasecmp(type, "UID") == 0) | |
435 | return(T_UID); /* user id */ | |
436 | if (strcasecmp(type, "GID") == 0) | |
437 | return(T_GID); /* group id */ | |
438 | if (strcasecmp(type, "TXT") == 0) | |
439 | return(T_TXT); /* text */ | |
440 | fprintf(stderr, "unknown query type: %s\n", type); | |
441 | return(dflt); | |
442 | } | |
443 | \f | |
444 | /* | |
445 | ******************************************************************************* | |
446 | * | |
447 | * DecodeType -- | |
448 | * | |
449 | * Converts a query type to a descriptive name. | |
450 | * (A more verbose form of p_type.) | |
451 | * | |
452 | * | |
453 | ******************************************************************************* | |
454 | */ | |
455 | ||
456 | static char nbuf[20]; | |
457 | ||
458 | char * | |
459 | DecodeType(type) | |
460 | int type; | |
461 | { | |
462 | switch (type) { | |
463 | case T_A: | |
464 | return("address"); | |
465 | case T_NS: | |
466 | return("name server"); | |
467 | case T_CNAME: | |
468 | return("canonical name"); | |
469 | case T_SOA: | |
470 | return("start of authority"); | |
471 | case T_MB: | |
472 | return("mailbox"); | |
473 | case T_MG: | |
474 | return("mail group member"); | |
475 | case T_MR: | |
476 | return("mail rename"); | |
477 | case T_NULL: | |
478 | return("null"); | |
479 | case T_WKS: | |
480 | return("well-known service"); | |
481 | case T_PTR: | |
482 | return("domain name pointer"); | |
483 | case T_HINFO: | |
484 | return("host information"); | |
485 | case T_MINFO: | |
486 | return("mailbox information"); | |
487 | case T_MX: | |
488 | return("mail exchanger"); | |
489 | case T_TXT: | |
490 | return("text"); | |
491 | case T_UINFO: | |
492 | return("user information"); | |
493 | case T_UID: | |
494 | return("user ID"); | |
495 | case T_GID: | |
496 | return("group ID"); | |
497 | case T_AXFR: | |
498 | return("zone transfer"); | |
499 | case T_MAILB: | |
500 | return("mailbox-related data"); | |
501 | case T_MAILA: | |
502 | return("mail agent"); | |
503 | case T_ANY: | |
504 | return("\"any\""); | |
505 | default: | |
506 | (void) sprintf(nbuf, "%d", type); | |
507 | return (nbuf); | |
508 | } | |
509 | } |