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) 1999-2000 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  It is part of adns, which is
  11  *    Copyright (C) 1997-2000 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 and
  30  *  subsequently.
  31  */
  32
  33 static const char * const cvsid =
  34         "$Id$";
  35
  36 #include <sys/types.h>
  37 #include <sys/time.h>
  38
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <stdlib.h>
  42 #include <stdio.h>
  43 #include <ctype.h>
  44 #include <errno.h>
  45
  46 #include "adns.h"
  47
  48 /* maximum number of concurrent DNS queries */
  49 #define MAXPENDING 1000
  50
  51 /* maximum length of a line */
  52 #define MAXLINE 1024
  53
  54 /* option flags */
  55 #define OPT_DEBUG 1
  56 #define OPT_POLL 2
  57
  58 static const char *progname;
  59
  60 #define msg(fmt, args...) fprintf(stderr, "%s: " fmt "\n", progname, ##args)
  61
  62 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  63   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  64
  65 static void aargh(const char *cause) {
  66   const char *why = strerror(errno);
  67   if (!why) why = "Unknown error";
  68   msg("%s: %s (%d)", cause, why, errno);
  69   exit(1);
  70 }
  71
  72 /*
  73  * Parse the IP address and convert to a reverse domain name.
  74  */
  75 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  76   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  77   char *ptrs[5];
  78   int i;
  79
  80   ptrs[0]= start;
  81 retry:
  82   while (!sensible_ctype(isdigit,*ptrs[0]))
  83     if (!*ptrs[0]++) {
  84       strcpy(buf, "invalid.");
  85       *addr= *rest= NULL;
  86       return buf;
  87     }
  88   for (i= 1; i < 5; i++) {
  89     ptrs[i]= ptrs[i-1];
  90     while (sensible_ctype(isdigit,*ptrs[i]++));
  91     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
  92         (i != 4 && ptrs[i][-1] != '.') ||
  93         (ptrs[i]-ptrs[i-1] > 4)) {
  94       ptrs[0]= ptrs[i]-1;
  95       goto retry;
  96     }
  97   }
  98   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
  99           ptrs[4]-ptrs[3]-1, ptrs[3],
 100           ptrs[3]-ptrs[2]-1, ptrs[2],
 101           ptrs[2]-ptrs[1]-1, ptrs[1],
 102           ptrs[1]-ptrs[0]-1, ptrs[0]);
 103   *addr= ptrs[0];
 104   *rest= ptrs[4]-1;
 105   return buf;
 106 }
 107
 108 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 109   if (domain)
 110     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 111   else
 112     fputs(start, outf);
 113   if (ferror(outf)) aargh("write output");
 114 }
 115
 116 typedef struct logline {
 117   struct logline *next;
 118   char *start, *addr, *rest;
 119   adns_query query;
 120 } logline;
 121
 122 static logline *readline(FILE *inf, adns_state adns, int opts) {
 123   static char buf[MAXLINE];
 124   char *str;
 125   logline *line;
 126
 127   if (fgets(buf, MAXLINE, inf)) {
 128     str= malloc(sizeof(*line) + strlen(buf) + 1);
 129     if (!str) aargh("malloc");
 130     line= (logline*)str;
 131     line->next= NULL;
 132     line->start= str+sizeof(logline);
 133     strcpy(line->start, buf);
 134     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 135     if (opts & OPT_DEBUG)
 136       msg("submitting %.*s -> %s", line->rest-line->addr, line->addr, str);
 137     if (adns_submit(adns, str, adns_r_ptr,
 138                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 139                     NULL, &line->query))
 140       aargh("adns_submit");
 141     return line;
 142   }
 143   if (!feof(inf))
 144     aargh("fgets");
 145   return NULL;
 146 }
 147
 148 static void proclog(FILE *inf, FILE *outf, int opts) {
 149   int eof, err, len;
 150   adns_state adns;
 151   adns_answer *answer;
 152   logline *head, *tail, *line;
 153
 154   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 155   if (errno) aargh("adns_init");
 156   head= tail= readline(inf, adns, opts);
 157   len= 1; eof= 0;
 158   while (head) {
 159     if (opts & OPT_DEBUG)
 160       msg("%d in queue; checking %.*s", len,
 161           head->rest-head->addr, head->addr);
 162     if (eof || len > MAXPENDING)
 163       if (opts & OPT_POLL)
 164         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 165       else
 166         err= adns_wait(adns, &head->query, &answer, NULL);
 167     else
 168       err= adns_check(adns, &head->query, &answer, NULL);
 169     if (err != EAGAIN) {
 170       printline(outf, head->start, head->addr, head->rest,
 171                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 172       line= head; head= head->next;
 173       free(line); free(answer);
 174       len--;
 175     }
 176     if (!eof) {
 177       line= readline(inf, adns, opts);
 178       if (!line)
 179         eof= 1;
 180       else {
 181         if (!head)
 182           head= line;
 183         else
 184           tail->next= line;
 185         tail= line;
 186         len++;
 187       }
 188     }
 189   }
 190   adns_finish(adns);
 191 }
 192
 193 static void usage(void) {
 194   fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname);
 195   exit(1);
 196 }
 197
 198 int main(int argc, char *argv[]) {
 199   int c, opts;
 200   FILE *inf;
 201
 202   progname= strrchr(*argv, '/');
 203   if (progname)
 204     progname++;
 205   else
 206     progname= *argv;
 207   opts= 0;
 208
 209   while ((c= getopt(argc, argv, "dp")) != -1)
 210     switch (c) {
 211     case 'd':
 212       opts|= OPT_DEBUG;
 213       break;
 214     case 'p':
 215       opts|= OPT_POLL;
 216       break;
 217     default:
 218       usage();
 219     }
 220
 221   argc-= optind;
 222   argv+= optind;
 223
 224   inf= NULL;
 225   if (argc == 0)
 226     inf= stdin;
 227   else if (argc == 1)
 228     inf= fopen(*argv, "r");
 229   else
 230     usage();
 231
 232   if (!inf)
 233     aargh("couldn't open input");
 234
 235   proclog(inf, stdout, opts);
 236
 237   if (fclose(inf))
 238     aargh("fclose input");
 239   if (fclose(stdout))
 240     aargh("fclose output");
 241
 242   return 0;
 243 }