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 Tony Finch <dot@dotat.at>
   8  *   Copyright (C) 1999 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  It is part of adns, which is
  11  *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
  12  *    Copyright (C) 1999 Tony Finch <dot@dotat.at>
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License as published by
  16  *  the Free Software Foundation; either version 2, or (at your option)
  17  *  any later version.
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this program; if not, write to the Free Software Foundation,
  26  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27  *
  28  * This version was originally supplied by Tony Finch, but has been
  29  * modified by Ian Jackson as it was incorporated into adns.
  30  */
  31
  32 static const char * const cvsid =
  33         "$Id$";
  34
  35 #include <sys/types.h>
  36 #include <sys/time.h>
  37
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <ctype.h>
  43 #include <errno.h>
  44
  45 #include "adns.h"
  46
  47 /* maximum number of concurrent DNS queries */
  48 #define MAXPENDING 1000
  49
  50 /* maximum length of a line */
  51 #define MAXLINE 1024
  52
  53 /* option flags */
  54 #define OPT_DEBUG 1
  55 #define OPT_POLL 2
  56
  57 static const char *progname;
  58
  59 #define msg(fmt, args...) fprintf(stderr, "%s: " fmt "\n", progname, ##args)
  60
  61 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  62   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  63
  64 static void aargh(const char *cause) {
  65   const char *why = strerror(errno);
  66   if (!why) why = "Unknown error";
  67   msg("%s: %s (%d)", cause, why, errno);
  68   exit(1);
  69 }
  70
  71 /*
  72  * Parse the IP address and convert to a reverse domain name.
  73  */
  74 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  75   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  76   char *ptrs[5];
  77   int i;
  78
  79   ptrs[0]= start;
  80 retry:
  81   while (!sensible_ctype(isdigit,*ptrs[0]))
  82     if (!*ptrs[0]++) {
  83       strcpy(buf, "invalid.");
  84       *addr= *rest= NULL;
  85       return buf;
  86     }
  87   for (i= 1; i < 5; i++) {
  88     ptrs[i]= ptrs[i-1];
  89     while (sensible_ctype(isdigit,*ptrs[i]++));
  90     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
  91         (i != 4 && ptrs[i][-1] != '.') ||
  92         (ptrs[i]-ptrs[i-1] > 4)) {
  93       ptrs[0]= ptrs[i]-1;
  94       goto retry;
  95     }
  96   }
  97   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
  98           ptrs[4]-ptrs[3]-1, ptrs[3],
  99           ptrs[3]-ptrs[2]-1, ptrs[2],
 100           ptrs[2]-ptrs[1]-1, ptrs[1],
 101           ptrs[1]-ptrs[0]-1, ptrs[0]);
 102   *addr= ptrs[0];
 103   *rest= ptrs[4]-1;
 104   return buf;
 105 }
 106
 107 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 108   if (domain)
 109     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 110   else
 111     fputs(start, outf);
 112   if (ferror(outf)) aargh("write output");
 113 }
 114
 115 typedef struct logline {
 116   struct logline *next;
 117   char *start, *addr, *rest;
 118   adns_query query;
 119 } logline;
 120
 121 static logline *readline(FILE *inf, adns_state adns, int opts) {
 122   static char buf[MAXLINE];
 123   char *str;
 124   logline *line;
 125
 126   if (fgets(buf, MAXLINE, inf)) {
 127     str= malloc(sizeof(*line) + strlen(buf) + 1);
 128     if (!str) aargh("malloc");
 129     line= (logline*)str;
 130     line->next= NULL;
 131     line->start= str+sizeof(logline);
 132     strcpy(line->start, buf);
 133     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 134     if (opts & OPT_DEBUG)
 135       msg("submitting %.*s -> %s", line->rest-line->addr, line->addr, str);
 136     if (adns_submit(adns, str, adns_r_ptr,
 137                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 138                     NULL, &line->query))
 139       aargh("adns_submit");
 140     return line;
 141   }
 142   if (!feof(inf))
 143     aargh("fgets");
 144   return NULL;
 145 }
 146
 147 static void proclog(FILE *inf, FILE *outf, int opts) {
 148   int eof, err, len;
 149   adns_state adns;
 150   adns_answer *answer;
 151   logline *head, *tail, *line;
 152
 153   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 154   if (errno) aargh("adns_init");
 155   head= tail= readline(inf, adns, opts);
 156   len= 1; eof= 0;
 157   while (head) {
 158     if (opts & OPT_DEBUG)
 159       msg("%d in queue; checking %.*s", len,
 160           head->rest-head->addr, head->addr);
 161     if (eof || len > MAXPENDING)
 162       if (opts & OPT_POLL)
 163         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 164       else
 165         err= adns_wait(adns, &head->query, &answer, NULL);
 166     else
 167       err= adns_check(adns, &head->query, &answer, NULL);
 168     if (err != EAGAIN) {
 169       printline(outf, head->start, head->addr, head->rest,
 170                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 171       line= head; head= head->next;
 172       free(line); free(answer);
 173       len--;
 174     }
 175     if (!eof) {
 176       line= readline(inf, adns, opts);
 177       if (!line)
 178         eof= 1;
 179       else {
 180         if (!head)
 181           head= line;
 182         else
 183           tail->next= line;
 184         tail= line;
 185         len++;
 186       }
 187     }
 188   }
 189   adns_finish(adns);
 190 }
 191
 192 static void usage(void) {
 193   fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname);
 194   exit(1);
 195 }
 196
 197 int main(int argc, char *argv[]) {
 198   int c, opts;
 199   FILE *inf;
 200
 201   progname= strrchr(*argv, '/');
 202   if (progname)
 203     progname++;
 204   else
 205     progname= *argv;
 206   opts= 0;
 207
 208   while ((c= getopt(argc, argv, "dp")) != -1)
 209     switch (c) {
 210     case 'd':
 211       opts|= OPT_DEBUG;
 212       break;
 213     case 'p':
 214       opts|= OPT_POLL;
 215       break;
 216     default:
 217       usage();
 218     }
 219
 220   argc-= optind;
 221   argv+= optind;
 222
 223   inf= NULL;
 224   if (argc == 0)
 225     inf= stdin;
 226   else if (argc == 1)
 227     inf= fopen(*argv, "r");
 228   else
 229     usage();
 230
 231   if (!inf)
 232     aargh("couldn't open input");
 233
 234   proclog(inf, stdout, opts);
 235
 236   if (fclose(inf))
 237     aargh("fclose input");
 238   if (fclose(stdout))
 239     aargh("fclose output");
 240
 241   return 0;
 242 }