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 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>
45 #ifdef ADNS_REGRESS_TEST
46 # include "hredirect.h"
50 struct outqueuenode *next, *back;
54 struct timeval printbefore;
55 struct treething *addr;
58 static int bracket, forever, address;
59 static unsigned long timeout= 1000;
60 static adns_rrtype rrt= adns_r_ptr;
61 static adns_initflags initflags= 0;
62 static const char *config_text;
64 static int outblocked, inputeof;
65 static struct { struct outqueuenode *head, *tail; } outqueue;
66 static int peroutqueuenode, outqueuelen;
68 static struct sockaddr_in sa;
69 static adns_state ads;
71 static char addrtextbuf[14];
72 static int cbyte, inbyte, inbuf;
73 static unsigned char bytes[4];
74 static struct timeval printbefore;
77 unsigned char bytes[4];
82 static struct treething *newthing;
83 static void *treeroot;
85 static int nonblock(int fd, int isnonblock) {
90 r= fcntl(fd,F_SETFL, isnonblock ? r|O_NONBLOCK : r&~O_NONBLOCK);
95 static void quit(int exitstatus) NONRETURNING;
96 static void quit(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\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")
132 static void usageerr(const char *why) NONRETURNING;
133 static void usageerr(const char *why) {
134 fprintf(stderr,"adnsresfilter: bad usage: %s\n",why);
139 static void adnsfail(const char *what, int e) NONRETURNING;
140 static void adnsfail(const char *what, int e) {
141 fprintf(stderr,"adnsresfilter: adns call failed: %s: %s\n",what,strerror(e));
145 static void settimeout(const char *arg) {
147 timeout= strtoul(arg,&ep,0);
148 if (*ep) usageerr("invalid timeout");
151 static void parseargs(const char *const *argv) {
155 while ((arg= *++argv)) {
156 if (arg[0] != '-') usageerr("no non-option arguments are allowed");
158 if (!strcmp(arg,"--timeout")) {
159 if (!(arg= *++argv)) usageerr("--timeout needs a value");
162 } else if (!strcmp(arg,"--wait")) {
164 } else if (!strcmp(arg,"--brackets")) {
166 } else if (!strcmp(arg,"--address")) {
168 } else if (!strcmp(arg,"--unchecked")) {
170 } else if (!strcmp(arg,"--config")) {
171 if (!(arg= *++argv)) usageerr("--config needs a value");
173 } else if (!strcmp(arg,"--debug")) {
174 initflags |= adns_if_debug;
175 } else if (!strcmp(arg,"--help")) {
178 usageerr("unknown long option");
181 while ((c= *++arg)) {
184 if (*++arg) settimeout(arg);
185 else if ((arg= *++argv)) settimeout(arg);
186 else usageerr("-t needs a value");
206 usageerr("unknown short option");
213 static void queueoutchar(int c) {
214 struct outqueuenode *entry;
216 entry= outqueue.tail;
217 if (!entry || entry->addr || entry->textlen >= peroutqueuenode) {
218 peroutqueuenode= !peroutqueuenode || !entry || entry->addr ? 128 :
219 peroutqueuenode >= 1024 ? 4096 : peroutqueuenode<<2;
220 entry= xmalloc(sizeof(*entry));
221 entry->buffer= xmalloc(peroutqueuenode);
222 entry->textp= entry->buffer;
225 LIST_LINK_TAIL(outqueue,entry);
228 entry->textp[entry->textlen++]= c;
231 static void queueoutstr(const char *str, int len) {
232 while (len-- > 0) queueoutchar(*str++);
235 static void writestdout(struct outqueuenode *entry) {
238 while (entry->textlen) {
239 r= write(1, entry->textp, entry->textlen);
241 if (errno == EINTR) continue;
242 if (errno == EAGAIN) { outblocked= 1; break; }
243 sysfail("write stdout");
245 assert(r <= entry->textlen);
249 if (!entry->textlen) {
250 LIST_UNLINK(outqueue,entry);
257 static void replacetextwithname(struct outqueuenode *entry) {
261 name= entry->addr->ans->rrs.str[0];
262 namelen= strlen(name);
267 entry->textlen= namelen;
269 newlen= entry->textlen + namelen + (bracket ? 0 : 2);
270 newbuf= xmalloc(newlen + 1);
271 sprintf(newbuf, bracket ? "%s%.*s" : "%s[%.*s]", name, entry->textlen, entry->textp);
273 entry->buffer= entry->textp= newbuf;
274 entry->textlen= newlen;
278 static void checkadnsqueries(void) {
282 struct treething *foundthing;
286 qu= 0; context= 0; ans= 0;
287 r= adns_check(ads,&qu,&ans,&context);
288 if (r == ESRCH || r == EAGAIN) break;
291 foundthing->ans= ans;
296 static void restartbuf(void) {
297 if (inbuf>0) queueoutstr(addrtextbuf,inbuf);
301 static int comparer(const void *a, const void *b) {
302 return memcmp(a,b,4);
305 static void procaddr(void) {
306 struct treething *foundthing;
308 struct outqueuenode *entry;
312 newthing= xmalloc(sizeof(struct treething));
317 memcpy(newthing->bytes,bytes,4);
318 searchfound= tsearch(newthing,&treeroot,comparer);
319 if (!searchfound) sysfail("tsearch");
320 foundthing= *searchfound;
322 if (foundthing == newthing) {
324 memcpy(&sa.sin_addr,bytes,4);
325 r= adns_submit_reverse(ads, (const struct sockaddr*)&sa,
326 rrt,0,foundthing,&foundthing->qu);
327 if (r) adnsfail("submit",r);
329 entry= xmalloc(sizeof(*entry));
330 entry->buffer= xmalloc(inbuf);
331 entry->textp= entry->buffer;
332 memcpy(entry->textp,addrtextbuf,inbuf);
333 entry->textlen= inbuf;
334 entry->addr= foundthing;
335 entry->printbefore= printbefore;
336 LIST_LINK_TAIL(outqueue,entry);
342 static void startaddr(void) {
347 static void readstdin(void) {
348 char readbuf[512], *p;
351 while ((r= read(0,readbuf,sizeof(readbuf))) <= 0) {
352 if (r == 0) { inputeof= 1; return; }
353 if (r == EAGAIN) return;
354 if (r != EINTR) sysfail("read stdin");
356 for (p=readbuf; r>0; r--,p++) {
358 if (cbyte==-1 && bracket && c=='[') {
359 addrtextbuf[inbuf++]= c;
361 } else if (cbyte==-1 && !bracket && !isalnum(c)) {
364 } else if (cbyte>=0 && inbyte<3 && c>='0' && c<='9' &&
365 (nbyte= bytes[cbyte]*10 + (c-'0')) <= 255) {
367 addrtextbuf[inbuf++]= c;
369 } else if (cbyte>=0 && cbyte<3 && inbyte>0 && c=='.') {
371 addrtextbuf[inbuf++]= c;
373 } else if (cbyte==3 && inbyte>0 && bracket && c==']') {
374 addrtextbuf[inbuf++]= c;
376 } else if (cbyte==3 && inbyte>0 && !bracket && !isalnum(c)) {
384 if (!bracket && !isalnum(c)) startaddr();
389 static void startup(void) {
392 if (nonblock(0,1)) sysfail("set stdin to nonblocking mode");
393 if (nonblock(1,1)) sysfail("set stdout to nonblocking mode");
394 memset(&sa,0,sizeof(sa));
395 sa.sin_family= AF_INET;
397 r= adns_init_strcfg(&ads,initflags,stderr,config_text);
399 r= adns_init(&ads,initflags,0);
401 if (r) adnsfail("init",r);
405 if (!bracket) startaddr();
408 int main(int argc, const char *const *argv) {
410 fd_set readfds, writefds, exceptfds;
411 struct outqueuenode *entry;
412 struct timeval *tv, tvbuf, now;
417 while (!inputeof || outqueue.head) {
420 FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
421 if ((entry= outqueue.head) && !outblocked) {
426 if (entry->addr->ans) {
427 if (entry->addr->ans->nrrs)
428 replacetextwithname(entry);
432 r= gettimeofday(&now,0); if (r) sysfail("gettimeofday");
435 } else if (!timercmp(&now,&entry->printbefore,<)) {
439 tvbuf.tv_sec= entry->printbefore.tv_sec - now.tv_sec - 1;
440 tvbuf.tv_usec= entry->printbefore.tv_usec - now.tv_usec + 1000000;
441 tvbuf.tv_sec += tvbuf.tv_usec / 1000000;
442 tvbuf.tv_usec %= 1000000;
445 adns_beforeselect(ads,&maxfd,&readfds,&writefds,&exceptfds,
448 if (outblocked) FD_SET(1,&writefds);
449 if (!inputeof && outqueuelen<1024) FD_SET(0,&readfds);
451 r= select(maxfd,&readfds,&writefds,&exceptfds,tv);
452 if (r < 0) { if (r == EINTR) continue; else sysfail("select"); }
454 r= gettimeofday(&now,0); if (r) sysfail("gettimeofday");
455 adns_afterselect(ads,maxfd,&readfds,&writefds,&exceptfds,&now);
458 if (FD_ISSET(0,&readfds)) {
461 timevaladd(&printbefore,timeout);
464 } else if (FD_ISSET(1,&writefds)) {
468 if (nonblock(0,0)) sysfail("un-nonblock stdin");
469 if (nonblock(1,0)) sysfail("un-nonblock stdout");
470 if (ferror(stdin) || fclose(stdin)) sysfail("read stdin");
471 if (fclose(stdout)) sysfail("close stdout");