mdw@git.distorted.org.uk Git - adns/blob - client/adnslogres.c

   1 /*
   2  * adnslogres.c
   3  * - a replacement for the Apache logresolve program using adns
   4  */
   5 /*
   6  *  This file is
   7  *   Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
   8  *   Copyright (C) 1999-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  It is part of adns, which is
  11  *    Copyright (C) 1997-2000,2003,2006,2014  Ian Jackson
  12  *    Copyright (C) 2014  Mark Wooding
  13  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  14  *    Copyright (C) 1991 Massachusetts Institute of Technology
  15  *  (See the file INSTALL for full details.)
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 3, or (at your option)
  20  *  any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software Foundation.
  29  *
  30  *  This version was originally supplied by Tony Finch, but has been
  31  *  modified by Ian Jackson as it was incorporated into adns and
  32  *  subsequently.
  33  */
  34
  35 static const char * const cvsid =
  36         "$Id$";
  37
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40
  41 #include <unistd.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44 #include <stdio.h>
  45 #include <ctype.h>
  46 #include <errno.h>
  47 #include <stdarg.h>
  48
  49 #include "config.h"
  50 #include "adns.h"
  51 #include "client.h"
  52
  53 #ifdef ADNS_REGRESS_TEST
  54 # include "hredirect.h"
  55 #endif
  56
  57 /* maximum number of concurrent DNS queries */
  58 #define MAXMAXPENDING 64000
  59 #define DEFMAXPENDING 2000
  60
  61 /* maximum length of a line */
  62 #define MAXLINE 1024
  63
  64 /* option flags */
  65 #define OPT_DEBUG 1
  66 #define OPT_POLL 2
  67
  68 static const char *const progname= "adnslogres";
  69 static const char *config_text;
  70
  71 #define guard_null(str) ((str) ? (str) : "")
  72
  73 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  74   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  75
  76 static void msg(const char *fmt, ...) {
  77   va_list al;
  78
  79   fprintf(stderr, "%s: ", progname);
  80   va_start(al,fmt);
  81   vfprintf(stderr, fmt, al);
  82   va_end(al);
  83   fputc('\n',stderr);
  84 }
  85
  86 static void aargh(const char *cause) {
  87   const char *why = strerror(errno);
  88   if (!why) why = "Unknown error";
  89   msg("%s: %s (%d)", cause, why, errno);
  90   exit(1);
  91 }
  92
  93 /*
  94  * Parse the IP address and convert to a reverse domain name.
  95  */
  96 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  97   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  98   char *ptrs[5];
  99   int i;
 100
 101   ptrs[0]= start;
 102 retry:
 103   while (!sensible_ctype(isdigit,*ptrs[0]))
 104     if (!*ptrs[0]++) {
 105       strcpy(buf, "invalid.");
 106       *addr= *rest= NULL;
 107       return buf;
 108     }
 109   for (i= 1; i < 5; i++) {
 110     ptrs[i]= ptrs[i-1];
 111     while (sensible_ctype(isdigit,*ptrs[i]++));
 112     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 113         (i != 4 && ptrs[i][-1] != '.') ||
 114         (ptrs[i]-ptrs[i-1] > 4)) {
 115       ptrs[0]= ptrs[i]-1;
 116       goto retry;
 117     }
 118   }
 119   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 120           (int)(ptrs[4]-ptrs[3]-1), ptrs[3],
 121           (int)(ptrs[3]-ptrs[2]-1), ptrs[2],
 122           (int)(ptrs[2]-ptrs[1]-1), ptrs[1],
 123           (int)(ptrs[1]-ptrs[0]-1), ptrs[0]);
 124   *addr= ptrs[0];
 125   *rest= ptrs[4]-1;
 126   return buf;
 127 }
 128
 129 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 130   if (domain)
 131     fprintf(outf, "%.*s%s%s", (int)(addr - start), start, domain, rest);
 132   else
 133     fputs(start, outf);
 134   if (ferror(outf)) aargh("write output");
 135 }
 136
 137 typedef struct logline {
 138   struct logline *next;
 139   char *start, *addr, *rest;
 140   adns_query query;
 141 } logline;
 142
 143 static logline *readline(FILE *inf, adns_state adns, int opts) {
 144   static char buf[MAXLINE];
 145   char *str;
 146   logline *line;
 147
 148   if (fgets(buf, MAXLINE, inf)) {
 149     str= malloc(sizeof(*line) + strlen(buf) + 1);
 150     if (!str) aargh("malloc");
 151     line= (logline*)str;
 152     line->next= NULL;
 153     line->start= str+sizeof(logline);
 154     strcpy(line->start, buf);
 155     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 156     if (opts & OPT_DEBUG)
 157       msg("submitting %.*s -> %s", (int)(line->rest-line->addr), guard_null(line->addr), str);
 158     if (adns_submit(adns, str, adns_r_ptr,
 159                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 160                     NULL, &line->query))
 161       aargh("adns_submit");
 162     return line;
 163   }
 164   if (!feof(inf))
 165     aargh("fgets");
 166   return NULL;
 167 }
 168
 169 static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
 170   int eof, err, len;
 171   adns_state adns;
 172   adns_answer *answer;
 173   logline *head, *tail, *line;
 174   adns_initflags initflags;
 175
 176   initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
 177   if (config_text) {
 178     errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
 179   } else {
 180     errno= adns_init(&adns, initflags, 0);
 181   }
 182   if (errno) aargh("adns_init");
 183   head= tail= readline(inf, adns, opts);
 184   len= 1; eof= 0;
 185   while (head) {
 186     while (head) {
 187       if (opts & OPT_DEBUG)
 188         msg("%d in queue; checking %.*s", len,
 189             (int)(head->rest-head->addr), guard_null(head->addr));
 190       if (eof || len >= maxpending) {
 191         if (opts & OPT_POLL)
 192           err= adns_wait_poll(adns, &head->query, &answer, NULL);
 193         else
 194           err= adns_wait(adns, &head->query, &answer, NULL);
 195       } else {
 196         err= adns_check(adns, &head->query, &answer, NULL);
 197       }
 198       if (err == EAGAIN) break;
 199       if (err) {
 200         fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err));
 201         exit(1);
 202       }
 203       printline(outf, head->start, head->addr, head->rest,
 204                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 205       line= head; head= head->next;
 206       free(line);
 207       free(answer);
 208       len--;
 209     }
 210     if (!eof) {
 211       line= readline(inf, adns, opts);
 212       if (line) {
 213         if (!head) head= line;
 214         else tail->next= line;
 215         tail= line; len++;
 216       } else {
 217         eof= 1;
 218       }
 219     }
 220   }
 221   adns_finish(adns);
 222 }
 223
 224 static void printhelp(FILE *file) {
 225   fputs("usage: adnslogres [<options>] [<logfile>]\n"
 226         "       adnslogres --version|--help\n"
 227         "options: -c <concurrency>  set max number of outstanding queries\n"
 228         "         -p                use poll(2) instead of select(2)\n"
 229         "         -d                turn on debugging\n"
 230         "         -C <config>       use instead of contents of resolv.conf\n",
 231         stdout);
 232 }
 233
 234 static void usage(void) {
 235   printhelp(stderr);
 236   exit(1);
 237 }
 238
 239 int main(int argc, char *argv[]) {
 240   int c, opts, maxpending;
 241   extern char *optarg;
 242   FILE *inf;
 243
 244   if (argv[1] && !strncmp(argv[1],"--",2)) {
 245     if (!strcmp(argv[1],"--help")) {
 246       printhelp(stdout);
 247     } else if (!strcmp(argv[1],"--version")) {
 248       fputs(VERSION_MESSAGE("adnslogres"),stdout);
 249     } else {
 250       usage();
 251     }
 252     if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
 253     exit(0);
 254   }
 255
 256   maxpending= DEFMAXPENDING;
 257   opts= 0;
 258   while ((c= getopt(argc, argv, "c:C:dp")) != -1)
 259     switch (c) {
 260     case 'c':
 261       maxpending= atoi(optarg);
 262       if (maxpending < 1 || maxpending > MAXMAXPENDING) {
 263        fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
 264        exit(1);
 265       }
 266       break;
 267     case 'C':
 268       config_text= optarg;
 269       break;
 270     case 'd':
 271       opts|= OPT_DEBUG;
 272       break;
 273     case 'p':
 274       opts|= OPT_POLL;
 275       break;
 276     default:
 277       usage();
 278     }
 279
 280   argc-= optind;
 281   argv+= optind;
 282
 283   inf= NULL;
 284   if (argc == 0)
 285     inf= stdin;
 286   else if (argc == 1)
 287     inf= fopen(*argv, "r");
 288   else
 289     usage();
 290
 291   if (!inf)
 292     aargh("couldn't open input");
 293
 294   proclog(inf, stdout, maxpending, opts);
 295
 296   if (fclose(inf))
 297     aargh("fclose input");
 298   if (fclose(stdout))
 299     aargh("fclose output");
 300
 301   return 0;
 302 }