3 * - filter which does resolving, not part of the library
7 * Copyright (C) 1999-2000 Ian Jackson <ian@davenant.greenend.org.uk>
9 * It is part of adns, which is
10 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
11 * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 #include <sys/types.h>
46 #ifdef ADNS_REGRESS_TEST
47 # include "hredirect.h"
51 struct outqueuenode
*next
, *back
;
55 struct timeval printbefore
;
56 struct treething
*addr
;
59 static int bracket
, forever
, address
;
60 static unsigned long timeout
= 1000;
61 static adns_rrtype rrt
= adns_r_ptr
;
62 static adns_initflags initflags
= 0;
63 static const char *config_text
;
65 static int outblocked
, inputeof
;
66 static struct { struct outqueuenode
*head
, *tail
; } outqueue
;
67 static int peroutqueuenode
, outqueuelen
;
69 static struct sockaddr_in sa
;
70 static adns_state ads
;
72 static char addrtextbuf
[14];
73 static int cbyte
, inbyte
, inbuf
;
74 static unsigned char bytes
[4];
75 static struct timeval printbefore
;
78 unsigned char bytes
[4];
83 static struct treething
*newthing
;
84 static void *treeroot
;
86 static int nonblock(int fd
, int isnonblock
) {
91 r
= fcntl(fd
,F_SETFL
, isnonblock ? r
|O_NONBLOCK
: r
&~O_NONBLOCK
);
96 void quitnow(int exitstatus
) {
102 static void sysfail(const char *what
) NONRETURNING
;
103 static void sysfail(const char *what
) {
104 fprintf(stderr
,"adnsresfilter: system call failed: %s: %s\n",what
,strerror(errno
));
108 static void *xmalloc(size_t sz
) {
110 r
= malloc(sz
); if (r
) return r
;
114 static void outputerr(void) NONRETURNING
;
115 static void outputerr(void) { sysfail("write to stdout"); }
117 static void usage(void) {
118 if (printf("usage: adnsresfilter [<options ...>]\n"
119 " adnsresfilter -h|--help | --version\n"
120 "options: -t<milliseconds>|--timeout <milliseconds>\n"
121 " -w|--wait (always wait for queries to time out or fail)\n"
122 " -b|--brackets (require [...] around IP addresses)\n"
123 " -a|--address (always include [address] in output)\n"
124 " -u|--unchecked (do not forward map for checking)\n"
125 " --config <text> (use this instead of resolv.conf)\n"
126 " --debug (turn on adns resolver debugging)\n"
127 "Timeout is the maximum amount to delay any particular bit of output for.\n"
128 "Lookups will go on in the background. Default timeout = 1000 (ms).\n")
130 if (fflush(stdout
)) sysfail("flush stdout");
133 static void usageerr(const char *why
) NONRETURNING
;
134 static void usageerr(const char *why
) {
135 fprintf(stderr
,"adnsresfilter: bad usage: %s\n",why
);
140 static void adnsfail(const char *what
, int e
) NONRETURNING
;
141 static void adnsfail(const char *what
, int e
) {
142 fprintf(stderr
,"adnsresfilter: adns call failed: %s: %s\n",what
,strerror(e
));
146 static void settimeout(const char *arg
) {
148 timeout
= strtoul(arg
,&ep
,0);
149 if (*ep
) usageerr("invalid timeout");
152 static void parseargs(const char *const *argv
) {
156 while ((arg
= *++argv
)) {
157 if (arg
[0] != '-') usageerr("no non-option arguments are allowed");
159 if (!strcmp(arg
,"--timeout")) {
160 if (!(arg
= *++argv
)) usageerr("--timeout needs a value");
163 } else if (!strcmp(arg
,"--wait")) {
165 } else if (!strcmp(arg
,"--brackets")) {
167 } else if (!strcmp(arg
,"--address")) {
169 } else if (!strcmp(arg
,"--unchecked")) {
171 } else if (!strcmp(arg
,"--config")) {
172 if (!(arg
= *++argv
)) usageerr("--config needs a value");
174 } else if (!strcmp(arg
,"--debug")) {
175 initflags
|= adns_if_debug
;
176 } else if (!strcmp(arg
,"--help")) {
178 } else if (!strcmp(arg
,"--version")) {
179 VERSION_PRINT_QUIT("adnsresfilter"); quitnow(0);
181 usageerr("unknown long option");
184 while ((c
= *++arg
)) {
187 if (*++arg
) settimeout(arg
);
188 else if ((arg
= *++argv
)) settimeout(arg
);
189 else usageerr("-t needs a value");
209 usageerr("unknown short option");
216 static void queueoutchar(int c
) {
217 struct outqueuenode
*entry
;
219 entry
= outqueue
.tail
;
220 if (!entry
|| entry
->addr
|| entry
->textlen
>= peroutqueuenode
) {
221 peroutqueuenode
= !peroutqueuenode
|| !entry
|| entry
->addr ?
128 :
222 peroutqueuenode
>= 1024 ?
4096 : peroutqueuenode
<<2;
223 entry
= xmalloc(sizeof(*entry
));
224 entry
->buffer
= xmalloc(peroutqueuenode
);
225 entry
->textp
= entry
->buffer
;
228 LIST_LINK_TAIL(outqueue
,entry
);
231 entry
->textp
[entry
->textlen
++]= c
;
234 static void queueoutstr(const char *str
, int len
) {
235 while (len
-- > 0) queueoutchar(*str
++);
238 static void writestdout(struct outqueuenode
*entry
) {
241 while (entry
->textlen
) {
242 r
= write(1, entry
->textp
, entry
->textlen
);
244 if (errno
== EINTR
) continue;
245 if (errno
== EAGAIN
) { outblocked
= 1; break; }
246 sysfail("write stdout");
248 assert(r
<= entry
->textlen
);
252 if (!entry
->textlen
) {
253 LIST_UNLINK(outqueue
,entry
);
260 static void replacetextwithname(struct outqueuenode
*entry
) {
264 name
= entry
->addr
->ans
->rrs
.str
[0];
265 namelen
= strlen(name
);
270 entry
->textlen
= namelen
;
272 newlen
= entry
->textlen
+ namelen
+ (bracket ?
0 : 2);
273 newbuf
= xmalloc(newlen
+ 1);
274 sprintf(newbuf
, bracket ?
"%s%.*s" : "%s[%.*s]", name
, entry
->textlen
, entry
->textp
);
276 entry
->buffer
= entry
->textp
= newbuf
;
277 entry
->textlen
= newlen
;
281 static void checkadnsqueries(void) {
285 struct treething
*foundthing
;
289 qu
= 0; context
= 0; ans
= 0;
290 r
= adns_check(ads
,&qu
,&ans
,&context
);
291 if (r
== ESRCH
|| r
== EAGAIN
) break;
294 foundthing
->ans
= ans
;
299 static void restartbuf(void) {
300 if (inbuf
>0) queueoutstr(addrtextbuf
,inbuf
);
304 static int comparer(const void *a
, const void *b
) {
305 return memcmp(a
,b
,4);
308 static void procaddr(void) {
309 struct treething
*foundthing
;
311 struct outqueuenode
*entry
;
315 newthing
= xmalloc(sizeof(struct treething
));
320 memcpy(newthing
->bytes
,bytes
,4);
321 searchfound
= tsearch(newthing
,&treeroot
,comparer
);
322 if (!searchfound
) sysfail("tsearch");
323 foundthing
= *searchfound
;
325 if (foundthing
== newthing
) {
327 memcpy(&sa
.sin_addr
,bytes
,4);
328 r
= adns_submit_reverse(ads
, (const struct sockaddr
*)&sa
,
329 rrt
,0,foundthing
,&foundthing
->qu
);
330 if (r
) adnsfail("submit",r
);
332 entry
= xmalloc(sizeof(*entry
));
333 entry
->buffer
= xmalloc(inbuf
);
334 entry
->textp
= entry
->buffer
;
335 memcpy(entry
->textp
,addrtextbuf
,inbuf
);
336 entry
->textlen
= inbuf
;
337 entry
->addr
= foundthing
;
338 entry
->printbefore
= printbefore
;
339 LIST_LINK_TAIL(outqueue
,entry
);
345 static void startaddr(void) {
350 static void readstdin(void) {
351 char readbuf
[512], *p
;
354 while ((r
= read(0,readbuf
,sizeof(readbuf
))) <= 0) {
355 if (r
== 0) { inputeof
= 1; return; }
356 if (r
== EAGAIN
) return;
357 if (r
!= EINTR
) sysfail("read stdin");
359 for (p
=readbuf
; r
>0; r
--,p
++) {
361 if (cbyte
==-1 && bracket
&& c
=='[') {
362 addrtextbuf
[inbuf
++]= c
;
364 } else if (cbyte
==-1 && !bracket
&& !isalnum(c
)) {
367 } else if (cbyte
>=0 && inbyte
<3 && c
>='0' && c
<='9' &&
368 (nbyte
= bytes
[cbyte
]*10 + (c
-'0')) <= 255) {
370 addrtextbuf
[inbuf
++]= c
;
372 } else if (cbyte
>=0 && cbyte
<3 && inbyte
>0 && c
=='.') {
374 addrtextbuf
[inbuf
++]= c
;
376 } else if (cbyte
==3 && inbyte
>0 && bracket
&& c
==']') {
377 addrtextbuf
[inbuf
++]= c
;
379 } else if (cbyte
==3 && inbyte
>0 && !bracket
&& !isalnum(c
)) {
387 if (!bracket
&& !isalnum(c
)) startaddr();
392 static void startup(void) {
395 if (nonblock(0,1)) sysfail("set stdin to nonblocking mode");
396 if (nonblock(1,1)) sysfail("set stdout to nonblocking mode");
397 memset(&sa
,0,sizeof(sa
));
398 sa
.sin_family
= AF_INET
;
400 r
= adns_init_strcfg(&ads
,initflags
,stderr
,config_text
);
402 r
= adns_init(&ads
,initflags
,0);
404 if (r
) adnsfail("init",r
);
408 if (!bracket
) startaddr();
411 int main(int argc
, const char *const *argv
) {
413 fd_set readfds
, writefds
, exceptfds
;
414 struct outqueuenode
*entry
;
415 struct timeval
*tv
, tvbuf
, now
;
420 while (!inputeof
|| outqueue
.head
) {
423 FD_ZERO(&readfds
); FD_ZERO(&writefds
); FD_ZERO(&exceptfds
);
424 if ((entry
= outqueue
.head
) && !outblocked
) {
429 if (entry
->addr
->ans
) {
430 if (entry
->addr
->ans
->nrrs
)
431 replacetextwithname(entry
);
435 r
= gettimeofday(&now
,0); if (r
) sysfail("gettimeofday");
438 } else if (!timercmp(&now
,&entry
->printbefore
,<)) {
442 tvbuf
.tv_sec
= entry
->printbefore
.tv_sec
- now
.tv_sec
- 1;
443 tvbuf
.tv_usec
= entry
->printbefore
.tv_usec
- now
.tv_usec
+ 1000000;
444 tvbuf
.tv_sec
+= tvbuf
.tv_usec
/ 1000000;
445 tvbuf
.tv_usec
%= 1000000;
448 adns_beforeselect(ads
,&maxfd
,&readfds
,&writefds
,&exceptfds
,
451 if (outblocked
) FD_SET(1,&writefds
);
452 if (!inputeof
&& outqueuelen
<1024) FD_SET(0,&readfds
);
454 r
= select(maxfd
,&readfds
,&writefds
,&exceptfds
,tv
);
455 if (r
< 0) { if (r
== EINTR
) continue; else sysfail("select"); }
457 r
= gettimeofday(&now
,0); if (r
) sysfail("gettimeofday");
458 adns_afterselect(ads
,maxfd
,&readfds
,&writefds
,&exceptfds
,&now
);
461 if (FD_ISSET(0,&readfds
)) {
464 timevaladd(&printbefore
,timeout
);
467 } else if (FD_ISSET(1,&writefds
)) {
471 if (nonblock(0,0)) sysfail("un-nonblock stdin");
472 if (nonblock(1,0)) sysfail("un-nonblock stdout");