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 #define guard_null(str) ((str) ? (str) : "")
  62
  63 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  64   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  65
  66 static void aargh(const char *cause) {
  67   const char *why = strerror(errno);
  68   if (!why) why = "Unknown error";
  69   msg("%s: %s (%d)", cause, why, errno);
  70   exit(1);
  71 }
  72
  73 /*
  74  * Parse the IP address and convert to a reverse domain name.
  75  */
  76 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  77   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  78   char *ptrs[5];
  79   int i;
  80
  81   ptrs[0]= start;
  82 retry:
  83   while (!sensible_ctype(isdigit,*ptrs[0]))
  84     if (!*ptrs[0]++) {
  85       strcpy(buf, "invalid.");
  86       *addr= *rest= NULL;
  87       return buf;
  88     }
  89   for (i= 1; i < 5; i++) {
  90     ptrs[i]= ptrs[i-1];
  91     while (sensible_ctype(isdigit,*ptrs[i]++));
  92     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
  93         (i != 4 && ptrs[i][-1] != '.') ||
  94         (ptrs[i]-ptrs[i-1] > 4)) {
  95       ptrs[0]= ptrs[i]-1;
  96       goto retry;
  97     }
  98   }
  99   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 100           ptrs[4]-ptrs[3]-1, ptrs[3],
 101           ptrs[3]-ptrs[2]-1, ptrs[2],
 102           ptrs[2]-ptrs[1]-1, ptrs[1],
 103           ptrs[1]-ptrs[0]-1, ptrs[0]);
 104   *addr= ptrs[0];
 105   *rest= ptrs[4]-1;
 106   return buf;
 107 }
 108
 109 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 110   if (domain)
 111     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 112   else
 113     fputs(start, outf);
 114   if (ferror(outf)) aargh("write output");
 115 }
 116
 117 typedef struct logline {
 118   struct logline *next;
 119   char *start, *addr, *rest;
 120   adns_query query;
 121 } logline;
 122
 123 static logline *readline(FILE *inf, adns_state adns, int opts) {
 124   static char buf[MAXLINE];
 125   char *str;
 126   logline *line;
 127
 128   if (fgets(buf, MAXLINE, inf)) {
 129     str= malloc(sizeof(*line) + strlen(buf) + 1);
 130     if (!str) aargh("malloc");
 131     line= (logline*)str;
 132     line->next= NULL;
 133     line->start= str+sizeof(logline);
 134     strcpy(line->start, buf);
 135     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 136     if (opts & OPT_DEBUG)
 137       msg("submitting %.*s -> %s", line->rest-line->addr, guard_null(line->addr), str);
 138     if (adns_submit(adns, str, adns_r_ptr,
 139                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 140                     NULL, &line->query))
 141       aargh("adns_submit");
 142     return line;
 143   }
 144   if (!feof(inf))
 145     aargh("fgets");
 146   return NULL;
 147 }
 148
 149 static void proclog(FILE *inf, FILE *outf, int opts) {
 150   int eof, err, len;
 151   adns_state adns;
 152   adns_answer *answer;
 153   logline *head, *tail, *line;
 154
 155   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 156   if (errno) aargh("adns_init");
 157   head= tail= readline(inf, adns, opts);
 158   len= 1; eof= 0;
 159   while (head) {
 160     if (opts & OPT_DEBUG)
 161       msg("%d in queue; checking %.*s", len,
 162           head->rest-head->addr, guard_null(head->addr));
 163     if (eof || len > MAXPENDING)
 164       if (opts & OPT_POLL)
 165         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 166       else
 167         err= adns_wait(adns, &head->query, &answer, NULL);
 168     else
 169       err= adns_check(adns, &head->query, &answer, NULL);
 170     if (err != EAGAIN) {
 171       printline(outf, head->start, head->addr, head->rest,
 172                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 173       line= head; head= head->next;
 174       free(line); free(answer);
 175       len--;
 176     }
 177     if (!eof) {
 178       line= readline(inf, adns, opts);
 179       if (!line)
 180         eof= 1;
 181       else {
 182         if (!head)
 183           head= line;
 184         else
 185           tail->next= line;
 186         tail= line;
 187         len++;
 188       }
 189     }
 190   }
 191   adns_finish(adns);
 192 }
 193
 194 static void usage(void) {
 195   fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname);
 196   exit(1);
 197 }
 198
 199 int main(int argc, char *argv[]) {
 200   int c, opts;
 201   FILE *inf;
 202
 203   progname= strrchr(*argv, '/');
 204   if (progname)
 205     progname++;
 206   else
 207     progname= *argv;
 208   opts= 0;
 209
 210   while ((c= getopt(argc, argv, "dp")) != -1)
 211     switch (c) {
 212     case 'd':
 213       opts|= OPT_DEBUG;
 214       break;
 215     case 'p':
 216       opts|= OPT_POLL;
 217       break;
 218     default:
 219       usage();
 220     }
 221
 222   argc-= optind;
 223   argv+= optind;
 224
 225   inf= NULL;
 226   if (argc == 0)
 227     inf= stdin;
 228   else if (argc == 1)
 229     inf= fopen(*argv, "r");
 230   else
 231     usage();
 232
 233   if (!inf)
 234     aargh("couldn't open input");
 235
 236   proclog(inf, stdout, opts);
 237
 238   if (fclose(inf))
 239     aargh("fclose input");
 240   if (fclose(stdout))
 241     aargh("fclose output");
 242
 243   return 0;
 244 }