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 MAXMAXPENDING 64000
  52 #define DEFMAXPENDING 2000
  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 static const char *config_text;
  63
  64 #define guard_null(str) ((str) ? (str) : "")
  65
  66 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  67   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  68
  69 static void msg(const char *fmt, ...) {
  70   va_list al;
  71
  72   fprintf(stderr, "%s: ", progname);
  73   va_start(al,fmt);
  74   vfprintf(stderr, fmt, al);
  75   va_end(al);
  76   fputc('\n',stderr);
  77 }
  78
  79 static void aargh(const char *cause) {
  80   const char *why = strerror(errno);
  81   if (!why) why = "Unknown error";
  82   msg("%s: %s (%d)", cause, why, errno);
  83   exit(1);
  84 }
  85
  86 /*
  87  * Parse the IP address and convert to a reverse domain name.
  88  */
  89 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  90   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  91   char *ptrs[5];
  92   int i;
  93
  94   ptrs[0]= start;
  95 retry:
  96   while (!sensible_ctype(isdigit,*ptrs[0]))
  97     if (!*ptrs[0]++) {
  98       strcpy(buf, "invalid.");
  99       *addr= *rest= NULL;
 100       return buf;
 101     }
 102   for (i= 1; i < 5; i++) {
 103     ptrs[i]= ptrs[i-1];
 104     while (sensible_ctype(isdigit,*ptrs[i]++));
 105     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 106         (i != 4 && ptrs[i][-1] != '.') ||
 107         (ptrs[i]-ptrs[i-1] > 4)) {
 108       ptrs[0]= ptrs[i]-1;
 109       goto retry;
 110     }
 111   }
 112   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 113           ptrs[4]-ptrs[3]-1, ptrs[3],
 114           ptrs[3]-ptrs[2]-1, ptrs[2],
 115           ptrs[2]-ptrs[1]-1, ptrs[1],
 116           ptrs[1]-ptrs[0]-1, ptrs[0]);
 117   *addr= ptrs[0];
 118   *rest= ptrs[4]-1;
 119   return buf;
 120 }
 121
 122 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 123   if (domain)
 124     fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
 125   else
 126     fputs(start, outf);
 127   if (ferror(outf)) aargh("write output");
 128 }
 129
 130 typedef struct logline {
 131   struct logline *next;
 132   char *start, *addr, *rest;
 133   adns_query query;
 134 } logline;
 135
 136 static logline *readline(FILE *inf, adns_state adns, int opts) {
 137   static char buf[MAXLINE];
 138   char *str;
 139   logline *line;
 140
 141   if (fgets(buf, MAXLINE, inf)) {
 142     str= malloc(sizeof(*line) + strlen(buf) + 1);
 143     if (!str) aargh("malloc");
 144     line= (logline*)str;
 145     line->next= NULL;
 146     line->start= str+sizeof(logline);
 147     strcpy(line->start, buf);
 148     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 149     if (opts & OPT_DEBUG)
 150       msg("submitting %.*s -> %s", line->rest-line->addr, guard_null(line->addr), str);
 151     if (adns_submit(adns, str, adns_r_ptr,
 152                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 153                     NULL, &line->query))
 154       aargh("adns_submit");
 155     return line;
 156   }
 157   if (!feof(inf))
 158     aargh("fgets");
 159   return NULL;
 160 }
 161
 162 static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
 163   int eof, err, len;
 164   adns_state adns;
 165   adns_answer *answer;
 166   logline *head, *tail, *line;
 167   adns_initflags initflags;
 168
 169   initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
 170   if (config_text) {
 171     errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
 172   } else {
 173     errno= adns_init(&adns, initflags, 0);
 174   }
 175   if (errno) aargh("adns_init");
 176   head= tail= readline(inf, adns, opts);
 177   len= 1; eof= 0;
 178   while (head) {
 179     while (head) {
 180       if (opts & OPT_DEBUG)
 181         msg("%d in queue; checking %.*s", len,
 182             head->rest-head->addr, guard_null(head->addr));
 183       if (eof || len > maxpending) {
 184         if (opts & OPT_POLL)
 185           err= adns_wait_poll(adns, &head->query, &answer, NULL);
 186         else
 187           err= adns_wait(adns, &head->query, &answer, NULL);
 188       } else {
 189         err= adns_check(adns, &head->query, &answer, NULL);
 190       }
 191       if (err == EAGAIN) break;
 192       printline(outf, head->start, head->addr, head->rest,
 193                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 194       line= head; head= head->next;
 195       free(line); free(answer);
 196       len--;
 197     }
 198     if (!eof) {
 199       line= readline(inf, adns, opts);
 200       if (line) {
 201         if (!head) head= line;
 202         else tail->next= line;
 203         tail= line; len++;
 204       } else {
 205         eof= 1;
 206       }
 207     }
 208   }
 209   adns_finish(adns);
 210 }
 211
 212 static void usage(void) {
 213   fprintf(stderr, "usage: %s [-d] [-p] [-c concurrency] [-C config] [logfile]\n",
 214           progname);
 215   exit(1);
 216 }
 217
 218 int main(int argc, char *argv[]) {
 219   int c, opts, maxpending;
 220   extern char *optarg;
 221   FILE *inf;
 222
 223   progname= strrchr(*argv, '/');
 224   if (progname)
 225     progname++;
 226   else
 227     progname= *argv;
 228
 229   maxpending= DEFMAXPENDING;
 230   opts= 0;
 231   while ((c= getopt(argc, argv, "c:C:dp")) != -1)
 232     switch (c) {
 233     case 'c':
 234       maxpending= atoi(optarg);
 235       if (maxpending < 1 || maxpending > MAXMAXPENDING) {
 236        fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
 237        exit(1);
 238       }
 239       break;
 240     case 'C':
 241       config_text= optarg;
 242       break;
 243     case 'd':
 244       opts|= OPT_DEBUG;
 245       break;
 246     case 'p':
 247       opts|= OPT_POLL;
 248       break;
 249     default:
 250       usage();
 251     }
 252
 253   argc-= optind;
 254   argv+= optind;
 255
 256   inf= NULL;
 257   if (argc == 0)
 258     inf= stdin;
 259   else if (argc == 1)
 260     inf= fopen(*argv, "r");
 261   else
 262     usage();
 263
 264   if (!inf)
 265     aargh("couldn't open input");
 266
 267   proclog(inf, stdout, maxpending, opts);
 268
 269   if (fclose(inf))
 270     aargh("fclose input");
 271   if (fclose(stdout))
 272     aargh("fclose output");
 273
 274   return 0;
 275 }