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) 1997-2000,2003,2006,2014  Ian Jackson
  12  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  13  *    Copyright (C) 1991 Massachusetts Institute of Technology
  14  *  (See the file INSTALL for full details.)
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License as published by
  18  *  the Free Software Foundation; either version 3, or (at your option)
  19  *  any later version.
  20  *
  21  *  This program is distributed in the hope that it will be useful,
  22  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24  *  GNU General Public License for more details.
  25  *
  26  *  You should have received a copy of the GNU General Public License
  27  *  along with this program; if not, write to the Free Software Foundation.
  28  *
  29  *  This version was originally supplied by Tony Finch, but has been
  30  *  modified by Ian Jackson as it was incorporated into adns and
  31  *  subsequently.
  32  */
  33
  34 static const char * const cvsid =
  35         "$Id$";
  36
  37 #include <sys/types.h>
  38 #include <sys/time.h>
  39
  40 #include <unistd.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43 #include <stdio.h>
  44 #include <ctype.h>
  45 #include <errno.h>
  46 #include <stdarg.h>
  47
  48 #include "config.h"
  49 #include "adns.h"
  50 #include "client.h"
  51
  52 #ifdef ADNS_REGRESS_TEST
  53 # include "hredirect.h"
  54 #endif
  55
  56 /* maximum number of concurrent DNS queries */
  57 #define MAXMAXPENDING 64000
  58 #define DEFMAXPENDING 2000
  59
  60 /* maximum length of a line */
  61 #define MAXLINE 1024
  62
  63 /* option flags */
  64 #define OPT_DEBUG 1
  65 #define OPT_POLL 2
  66
  67 static const char *const progname= "adnslogres";
  68 static const char *config_text;
  69
  70 #define guard_null(str) ((str) ? (str) : "")
  71
  72 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  73   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  74
  75 static void msg(const char *fmt, ...) {
  76   va_list al;
  77
  78   fprintf(stderr, "%s: ", progname);
  79   va_start(al,fmt);
  80   vfprintf(stderr, fmt, al);
  81   va_end(al);
  82   fputc('\n',stderr);
  83 }
  84
  85 static void aargh(const char *cause) {
  86   const char *why = strerror(errno);
  87   if (!why) why = "Unknown error";
  88   msg("%s: %s (%d)", cause, why, errno);
  89   exit(1);
  90 }
  91
  92 /*
  93  * Parse the IP address and convert to a reverse domain name.
  94  */
  95 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  96   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  97   char *ptrs[5];
  98   int i;
  99
 100   ptrs[0]= start;
 101 retry:
 102   while (!sensible_ctype(isdigit,*ptrs[0]))
 103     if (!*ptrs[0]++) {
 104       strcpy(buf, "invalid.");
 105       *addr= *rest= NULL;
 106       return buf;
 107     }
 108   for (i= 1; i < 5; i++) {
 109     ptrs[i]= ptrs[i-1];
 110     while (sensible_ctype(isdigit,*ptrs[i]++));
 111     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 112         (i != 4 && ptrs[i][-1] != '.') ||
 113         (ptrs[i]-ptrs[i-1] > 4)) {
 114       ptrs[0]= ptrs[i]-1;
 115       goto retry;
 116     }
 117   }
 118   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 119           (int)(ptrs[4]-ptrs[3]-1), ptrs[3],
 120           (int)(ptrs[3]-ptrs[2]-1), ptrs[2],
 121           (int)(ptrs[2]-ptrs[1]-1), ptrs[1],
 122           (int)(ptrs[1]-ptrs[0]-1), ptrs[0]);
 123   *addr= ptrs[0];
 124   *rest= ptrs[4]-1;
 125   return buf;
 126 }
 127
 128 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 129   if (domain)
 130     fprintf(outf, "%.*s%s%s", (int)(addr - start), start, domain, rest);
 131   else
 132     fputs(start, outf);
 133   if (ferror(outf)) aargh("write output");
 134 }
 135
 136 typedef struct logline {
 137   struct logline *next;
 138   char *start, *addr, *rest;
 139   adns_query query;
 140 } logline;
 141
 142 static logline *readline(FILE *inf, adns_state adns, int opts) {
 143   static char buf[MAXLINE];
 144   char *str;
 145   logline *line;
 146
 147   if (fgets(buf, MAXLINE, inf)) {
 148     str= malloc(sizeof(*line) + strlen(buf) + 1);
 149     if (!str) aargh("malloc");
 150     line= (logline*)str;
 151     line->next= NULL;
 152     line->start= str+sizeof(logline);
 153     strcpy(line->start, buf);
 154     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 155     if (opts & OPT_DEBUG)
 156       msg("submitting %.*s -> %s", (int)(line->rest-line->addr), guard_null(line->addr), str);
 157     if (adns_submit(adns, str, adns_r_ptr,
 158                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 159                     NULL, &line->query))
 160       aargh("adns_submit");
 161     return line;
 162   }
 163   if (!feof(inf))
 164     aargh("fgets");
 165   return NULL;
 166 }
 167
 168 static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
 169   int eof, err, len;
 170   adns_state adns;
 171   adns_answer *answer;
 172   logline *head, *tail, *line;
 173   adns_initflags initflags;
 174
 175   initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
 176   if (config_text) {
 177     errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
 178   } else {
 179     errno= adns_init(&adns, initflags, 0);
 180   }
 181   if (errno) aargh("adns_init");
 182   head= tail= readline(inf, adns, opts);
 183   len= 1; eof= 0;
 184   while (head) {
 185     while (head) {
 186       if (opts & OPT_DEBUG)
 187         msg("%d in queue; checking %.*s", len,
 188             (int)(head->rest-head->addr), guard_null(head->addr));
 189       if (eof || len >= maxpending) {
 190         if (opts & OPT_POLL)
 191           err= adns_wait_poll(adns, &head->query, &answer, NULL);
 192         else
 193           err= adns_wait(adns, &head->query, &answer, NULL);
 194       } else {
 195         err= adns_check(adns, &head->query, &answer, NULL);
 196       }
 197       if (err == EAGAIN) break;
 198       if (err) {
 199         fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err));
 200         exit(1);
 201       }
 202       printline(outf, head->start, head->addr, head->rest,
 203                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 204       line= head; head= head->next;
 205       free(line);
 206       free(answer);
 207       len--;
 208     }
 209     if (!eof) {
 210       line= readline(inf, adns, opts);
 211       if (line) {
 212         if (!head) head= line;
 213         else tail->next= line;
 214         tail= line; len++;
 215       } else {
 216         eof= 1;
 217       }
 218     }
 219   }
 220   adns_finish(adns);
 221 }
 222
 223 static void printhelp(FILE *file) {
 224   fputs("usage: adnslogres [<options>] [<logfile>]\n"
 225         "       adnslogres --version|--help\n"
 226         "options: -c <concurrency>  set max number of outstanding queries\n"
 227         "         -p                use poll(2) instead of select(2)\n"
 228         "         -d                turn on debugging\n"
 229         "         -C <config>       use instead of contents of resolv.conf\n",
 230         stdout);
 231 }
 232
 233 static void usage(void) {
 234   printhelp(stderr);
 235   exit(1);
 236 }
 237
 238 int main(int argc, char *argv[]) {
 239   int c, opts, maxpending;
 240   extern char *optarg;
 241   FILE *inf;
 242
 243   if (argv[1] && !strncmp(argv[1],"--",2)) {
 244     if (!strcmp(argv[1],"--help")) {
 245       printhelp(stdout);
 246     } else if (!strcmp(argv[1],"--version")) {
 247       fputs(VERSION_MESSAGE("adnslogres"),stdout);
 248     } else {
 249       usage();
 250     }
 251     if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
 252     exit(0);
 253   }
 254
 255   maxpending= DEFMAXPENDING;
 256   opts= 0;
 257   while ((c= getopt(argc, argv, "c:C:dp")) != -1)
 258     switch (c) {
 259     case 'c':
 260       maxpending= atoi(optarg);
 261       if (maxpending < 1 || maxpending > MAXMAXPENDING) {
 262        fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
 263        exit(1);
 264       }
 265       break;
 266     case 'C':
 267       config_text= optarg;
 268       break;
 269     case 'd':
 270       opts|= OPT_DEBUG;
 271       break;
 272     case 'p':
 273       opts|= OPT_POLL;
 274       break;
 275     default:
 276       usage();
 277     }
 278
 279   argc-= optind;
 280   argv+= optind;
 281
 282   inf= NULL;
 283   if (argc == 0)
 284     inf= stdin;
 285   else if (argc == 1)
 286     inf= fopen(*argv, "r");
 287   else
 288     usage();
 289
 290   if (!inf)
 291     aargh("couldn't open input");
 292
 293   proclog(inf, stdout, maxpending, opts);
 294
 295   if (fclose(inf))
 296     aargh("fclose input");
 297   if (fclose(stdout))
 298     aargh("fclose output");
 299
 300   return 0;
 301 }