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 Ian Jackson <ian@davenant.greenend.org.uk>
  12  *    Copyright (C) 1999-2000 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 #include <stdarg.h>
  46
  47 #include "config.h"
  48 #include "adns.h"
  49
  50 /* maximum number of concurrent DNS queries */
  51 #define MAXPENDING 64000
  52 #define MAXPENDING 64000
  53
  54 /* maximum length of a line */
  55 #define MAXLINE 1024
  56
  57 /* option flags */
  58 #define OPT_DEBUG 1
  59 #define OPT_POLL 2
  60
  61 static const char *progname;
  62
  63 #define guard_null(str) ((str) ? (str) : "")
  64
  65 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  66   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  67
  68 static void msg(const char *fmt, ...) {
  69   va_list al;
  70
  71   fprintf(stderr, "%s: ", progname);
  72   va_start(al,fmt);
  73   vfprintf(stderr, fmt, al);
  74   va_end(al);
  75   fputc('\n',stderr);
  76 }
  77
  78 static void aargh(const char *cause) {
  79   const char *why = strerror(errno);
  80   if (!why) why = "Unknown error";
  81   msg("%s: %s (%d)", cause, why, errno);
  82   exit(1);
  83 }
  84
  85 /*
  86  * Parse the IP address and convert to a reverse domain name.
  87  */
  88 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  89   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  90   char *ptrs[5];
  91   int i;
  92
  93   ptrs[0]= start;
  94 retry:
  95   while (!sensible_ctype(isdigit,*ptrs[0]))
  96     if (!*ptrs[0]++) {
  97       strcpy(buf, "invalid.");
  98       *addr= *rest= NULL;
  99       return buf;
 100     }
 101   for (i= 1; i < 5; i++) {
 102     ptrs[i]= ptrs[i-1];
 103     while (sensible_ctype(isdigit,*ptrs[i]++));
 104     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 105         (i != 4 && ptrs[i][-1] != '.') ||
 106         (ptrs[i]-ptrs[i-1] > 4)) {
 107       ptrs[0]= ptrs[i]-1;
 108       goto retry;
 109     }
 110   }
 111   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 112           ptrs[4]-ptrs[3]-1, ptrs[3],
 113           ptrs[3]-ptrs[2]-1, ptrs[2],
 114           ptrs[2]-ptrs[1]-1, ptrs[1],
 115           ptrs[1]-ptrs[0]-1, ptrs[0]);
 116   *addr= ptrs[0];
 117   *rest= ptrs[4]-1;
 118   return buf;
 119 }
 120
 121 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 122   if (domain)
 123     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 124   else
 125     fputs(start, outf);
 126   if (ferror(outf)) aargh("write output");
 127 }
 128
 129 typedef struct logline {
 130   struct logline *next;
 131   char *start, *addr, *rest;
 132   adns_query query;
 133 } logline;
 134
 135 static logline *readline(FILE *inf, adns_state adns, int opts) {
 136   static char buf[MAXLINE];
 137   char *str;
 138   logline *line;
 139
 140   if (fgets(buf, MAXLINE, inf)) {
 141     str= malloc(sizeof(*line) + strlen(buf) + 1);
 142     if (!str) aargh("malloc");
 143     line= (logline*)str;
 144     line->next= NULL;
 145     line->start= str+sizeof(logline);
 146     strcpy(line->start, buf);
 147     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 148     if (opts & OPT_DEBUG)
 149       msg("submitting %.*s -> %s", line->rest-line->addr, guard_null(line->addr), str);
 150     if (adns_submit(adns, str, adns_r_ptr,
 151                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 152                     NULL, &line->query))
 153       aargh("adns_submit");
 154     return line;
 155   }
 156   if (!feof(inf))
 157     aargh("fgets");
 158   return NULL;
 159 }
 160
 161 static void proclog(FILE *inf, FILE *outf, int opts) {
 162   int eof, err, len;
 163   adns_state adns;
 164   adns_answer *answer;
 165   logline *head, *tail, *line;
 166
 167   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 168   if (errno) aargh("adns_init");
 169   head= tail= readline(inf, adns, opts);
 170   len= 1; eof= 0;
 171   while (head) {
 172     if (opts & OPT_DEBUG)
 173       msg("%d in queue; checking %.*s", len,
 174           head->rest-head->addr, guard_null(head->addr));
 175     if (eof || len > MAXPENDING) {
 176       if (opts & OPT_POLL)
 177         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 178       else
 179         err= adns_wait(adns, &head->query, &answer, NULL);
 180     } else {
 181       err= adns_check(adns, &head->query, &answer, NULL);
 182     }
 183     if (err != EAGAIN) {
 184       printline(outf, head->start, head->addr, head->rest,
 185                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 186       line= head; head= head->next;
 187       free(line); free(answer);
 188       len--;
 189     }
 190     if (!eof) {
 191       line= readline(inf, adns, opts);
 192       if (!line)
 193         eof= 1;
 194       else {
 195         if (!head)
 196           head= line;
 197         else
 198           tail->next= line;
 199         tail= line;
 200         len++;
 201       }
 202     }
 203   }
 204   adns_finish(adns);
 205 }
 206
 207 static void usage(void) {
 208   fprintf(stderr, "usage: %s [-d] [-p] [-c concurrency] [logfile]\n", progname);
 209   exit(1);
 210 }
 211
 212 int main(int argc, char *argv[]) {
 213   int c, opts, maxpending;
 214   extern char *optarg;
 215   FILE *inf;
 216
 217   progname= strrchr(*argv, '/');
 218   if (progname)
 219     progname++;
 220   else
 221     progname= *argv;
 222
 223   maxpending= MAXPENDING;
 224   opts= 0;
 225   while ((c= getopt(argc, argv, "c:dp")) != -1)
 226     switch (c) {
 227     case 'c':
 228       maxpending= atoi(optarg);
 229       if (maxpending < 1 || maxpending > MAXPENDING) {
 230        fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
 231        exit(1);
 232       }
 233       break;
 234     case 'd':
 235       opts|= OPT_DEBUG;
 236       break;
 237     case 'p':
 238       opts|= OPT_POLL;
 239       break;
 240     default:
 241       usage();
 242     }
 243
 244   argc-= optind;
 245   argv+= optind;
 246
 247   inf= NULL;
 248   if (argc == 0)
 249     inf= stdin;
 250   else if (argc == 1)
 251     inf= fopen(*argv, "r");
 252   else
 253     usage();
 254
 255   if (!inf)
 256     aargh("couldn't open input");
 257
 258   proclog(inf, stdout, maxpending, opts);
 259
 260   if (fclose(inf))
 261     aargh("fclose input");
 262   if (fclose(stdout))
 263     aargh("fclose output");
 264
 265   return 0;
 266 }