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 #include <stdarg.h>
  46
  47 #include "config.h"
  48 #include "adns.h"
  49
  50 /* maximum number of concurrent DNS queries */
  51 #define MAXPENDING 1000
  52
  53 /* maximum length of a line */
  54 #define MAXLINE 1024
  55
  56 /* option flags */
  57 #define OPT_DEBUG 1
  58 #define OPT_POLL 2
  59
  60 static const char *progname;
  61
  62 #define guard_null(str) ((str) ? (str) : "")
  63
  64 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  65   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  66
  67 static void msg(const char *fmt, ...) {
  68   va_list al;
  69
  70   fprintf(stderr, "%s: ", progname);
  71   va_start(al,fmt);
  72   vfprintf(stderr, fmt, al);
  73   va_end(al);
  74   fputc('\n',stderr);
  75 }
  76
  77 static void aargh(const char *cause) {
  78   const char *why = strerror(errno);
  79   if (!why) why = "Unknown error";
  80   msg("%s: %s (%d)", cause, why, errno);
  81   exit(1);
  82 }
  83
  84 /*
  85  * Parse the IP address and convert to a reverse domain name.
  86  */
  87 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  88   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  89   char *ptrs[5];
  90   int i;
  91
  92   ptrs[0]= start;
  93 retry:
  94   while (!sensible_ctype(isdigit,*ptrs[0]))
  95     if (!*ptrs[0]++) {
  96       strcpy(buf, "invalid.");
  97       *addr= *rest= NULL;
  98       return buf;
  99     }
 100   for (i= 1; i < 5; i++) {
 101     ptrs[i]= ptrs[i-1];
 102     while (sensible_ctype(isdigit,*ptrs[i]++));
 103     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 104         (i != 4 && ptrs[i][-1] != '.') ||
 105         (ptrs[i]-ptrs[i-1] > 4)) {
 106       ptrs[0]= ptrs[i]-1;
 107       goto retry;
 108     }
 109   }
 110   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 111           ptrs[4]-ptrs[3]-1, ptrs[3],
 112           ptrs[3]-ptrs[2]-1, ptrs[2],
 113           ptrs[2]-ptrs[1]-1, ptrs[1],
 114           ptrs[1]-ptrs[0]-1, ptrs[0]);
 115   *addr= ptrs[0];
 116   *rest= ptrs[4]-1;
 117   return buf;
 118 }
 119
 120 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 121   if (domain)
 122     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 123   else
 124     fputs(start, outf);
 125   if (ferror(outf)) aargh("write output");
 126 }
 127
 128 typedef struct logline {
 129   struct logline *next;
 130   char *start, *addr, *rest;
 131   adns_query query;
 132 } logline;
 133
 134 static logline *readline(FILE *inf, adns_state adns, int opts) {
 135   static char buf[MAXLINE];
 136   char *str;
 137   logline *line;
 138
 139   if (fgets(buf, MAXLINE, inf)) {
 140     str= malloc(sizeof(*line) + strlen(buf) + 1);
 141     if (!str) aargh("malloc");
 142     line= (logline*)str;
 143     line->next= NULL;
 144     line->start= str+sizeof(logline);
 145     strcpy(line->start, buf);
 146     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 147     if (opts & OPT_DEBUG)
 148       msg("submitting %.*s -> %s", line->rest-line->addr, guard_null(line->addr), str);
 149     if (adns_submit(adns, str, adns_r_ptr,
 150                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 151                     NULL, &line->query))
 152       aargh("adns_submit");
 153     return line;
 154   }
 155   if (!feof(inf))
 156     aargh("fgets");
 157   return NULL;
 158 }
 159
 160 static void proclog(FILE *inf, FILE *outf, int opts) {
 161   int eof, err, len;
 162   adns_state adns;
 163   adns_answer *answer;
 164   logline *head, *tail, *line;
 165
 166   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 167   if (errno) aargh("adns_init");
 168   head= tail= readline(inf, adns, opts);
 169   len= 1; eof= 0;
 170   while (head) {
 171     if (opts & OPT_DEBUG)
 172       msg("%d in queue; checking %.*s", len,
 173           head->rest-head->addr, guard_null(head->addr));
 174     if (eof || len > MAXPENDING) {
 175       if (opts & OPT_POLL)
 176         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 177       else
 178         err= adns_wait(adns, &head->query, &answer, NULL);
 179     } else {
 180       err= adns_check(adns, &head->query, &answer, NULL);
 181     }
 182     if (err != EAGAIN) {
 183       printline(outf, head->start, head->addr, head->rest,
 184                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 185       line= head; head= head->next;
 186       free(line); free(answer);
 187       len--;
 188     }
 189     if (!eof) {
 190       line= readline(inf, adns, opts);
 191       if (!line)
 192         eof= 1;
 193       else {
 194         if (!head)
 195           head= line;
 196         else
 197           tail->next= line;
 198         tail= line;
 199         len++;
 200       }
 201     }
 202   }
 203   adns_finish(adns);
 204 }
 205
 206 static void usage(void) {
 207   fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname);
 208   exit(1);
 209 }
 210
 211 int main(int argc, char *argv[]) {
 212   int c, opts;
 213   FILE *inf;
 214
 215   progname= strrchr(*argv, '/');
 216   if (progname)
 217     progname++;
 218   else
 219     progname= *argv;
 220   opts= 0;
 221
 222   while ((c= getopt(argc, argv, "dp")) != -1)
 223     switch (c) {
 224     case 'd':
 225       opts|= OPT_DEBUG;
 226       break;
 227     case 'p':
 228       opts|= OPT_POLL;
 229       break;
 230     default:
 231       usage();
 232     }
 233
 234   argc-= optind;
 235   argv+= optind;
 236
 237   inf= NULL;
 238   if (argc == 0)
 239     inf= stdin;
 240   else if (argc == 1)
 241     inf= fopen(*argv, "r");
 242   else
 243     usage();
 244
 245   if (!inf)
 246     aargh("couldn't open input");
 247
 248   proclog(inf, stdout, opts);
 249
 250   if (fclose(inf))
 251     aargh("fclose input");
 252   if (fclose(stdout))
 253     aargh("fclose output");
 254
 255   return 0;
 256 }