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) 1997-2000,2003,2006,2014-2016  Ian Jackson
  12  *    Copyright (C) 2014  Mark Wooding
  13  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
  14  *    Copyright (C) 1991 Massachusetts Institute of Technology
  15  *  (See the file INSTALL for full details.)
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 3, or (at your option)
  20  *  any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software Foundation.
  29  *
  30  *  This version was originally supplied by Tony Finch, but has been
  31  *  modified by Ian Jackson as it was incorporated into adns and
  32  *  subsequently.
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/time.h>
  37
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <stdlib.h>
  41 #include <stdio.h>
  42 #include <ctype.h>
  43 #include <errno.h>
  44 #include <stdarg.h>
  45
  46 #include "config.h"
  47 #include "adns.h"
  48 #include "client.h"
  49
  50 #ifdef ADNS_REGRESS_TEST
  51 # include "hredirect.h"
  52 #endif
  53
  54 /* maximum number of concurrent DNS queries */
  55 #define MAXMAXPENDING 64000
  56 #define DEFMAXPENDING 2000
  57
  58 /* maximum length of a line */
  59 #define MAXLINE 1024
  60
  61 /* option flags */
  62 #define OPT_DEBUG 1
  63 #define OPT_POLL 2
  64
  65 static const char *const progname= "adnslogres";
  66 static const char *config_text;
  67
  68 #define guard_null(str) ((str) ? (str) : "")
  69
  70 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
  71   /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
  72
  73 static void msg(const char *fmt, ...) {
  74   va_list al;
  75
  76   fprintf(stderr, "%s: ", progname);
  77   va_start(al,fmt);
  78   vfprintf(stderr, fmt, al);
  79   va_end(al);
  80   fputc('\n',stderr);
  81 }
  82
  83 static void aargh(const char *cause) {
  84   const char *why = strerror(errno);
  85   if (!why) why = "Unknown error";
  86   msg("%s: %s (%d)", cause, why, errno);
  87   exit(1);
  88 }
  89
  90 /*
  91  * Parse the IP address and convert to a reverse domain name.
  92  */
  93 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  94   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  95   char *ptrs[5];
  96   int i;
  97
  98   ptrs[0]= start;
  99 retry:
 100   while (!sensible_ctype(isdigit,*ptrs[0]))
 101     if (!*ptrs[0]++) {
 102       strcpy(buf, "invalid.");
 103       *addr= *rest= NULL;
 104       return buf;
 105     }
 106   for (i= 1; i < 5; i++) {
 107     ptrs[i]= ptrs[i-1];
 108     while (sensible_ctype(isdigit,*ptrs[i]++));
 109     if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) ||
 110         (i != 4 && ptrs[i][-1] != '.') ||
 111         (ptrs[i]-ptrs[i-1] > 4)) {
 112       ptrs[0]= ptrs[i]-1;
 113       goto retry;
 114     }
 115   }
 116   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
 117           (int)(ptrs[4]-ptrs[3]-1), ptrs[3],
 118           (int)(ptrs[3]-ptrs[2]-1), ptrs[2],
 119           (int)(ptrs[2]-ptrs[1]-1), ptrs[1],
 120           (int)(ptrs[1]-ptrs[0]-1), ptrs[0]);
 121   *addr= ptrs[0];
 122   *rest= ptrs[4]-1;
 123   return buf;
 124 }
 125
 126 static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
 127   if (domain)
 128     fprintf(outf, "%.*s%s%s", (int)(addr - start), start, domain, rest);
 129   else
 130     fputs(start, outf);
 131   if (ferror(outf)) aargh("write output");
 132 }
 133
 134 typedef struct logline {
 135   struct logline *next;
 136   char *start, *addr, *rest;
 137   adns_query query;
 138 } logline;
 139
 140 static logline *readline(FILE *inf, adns_state adns, int opts) {
 141   static char buf[MAXLINE];
 142   char *str;
 143   logline *line;
 144
 145   if (fgets(buf, MAXLINE, inf)) {
 146     str= malloc(sizeof(*line) + strlen(buf) + 1);
 147     if (!str) aargh("malloc");
 148     line= (logline*)str;
 149     line->next= NULL;
 150     line->start= str+sizeof(logline);
 151     strcpy(line->start, buf);
 152     str= ipaddr2domain(line->start, &line->addr, &line->rest);
 153     if (opts & OPT_DEBUG)
 154       msg("submitting %.*s -> %s", (int)(line->rest-line->addr), guard_null(line->addr), str);
 155     if (adns_submit(adns, str, adns_r_ptr,
 156                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 157                     NULL, &line->query))
 158       aargh("adns_submit");
 159     return line;
 160   }
 161   if (!feof(inf))
 162     aargh("fgets");
 163   return NULL;
 164 }
 165
 166 static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
 167   int eof, err, len;
 168   adns_state adns;
 169   adns_answer *answer;
 170   logline *head, *tail, *line;
 171   adns_initflags initflags;
 172
 173   initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
 174   if (config_text) {
 175     errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
 176   } else {
 177     errno= adns_init(&adns, initflags, 0);
 178   }
 179   if (errno) aargh("adns_init");
 180   head= tail= readline(inf, adns, opts);
 181   len= 1; eof= 0;
 182   while (head) {
 183     while (head) {
 184       if (opts & OPT_DEBUG)
 185         msg("%d in queue; checking %.*s", len,
 186             (int)(head->rest-head->addr), guard_null(head->addr));
 187       if (eof || len >= maxpending) {
 188         if (opts & OPT_POLL)
 189           err= adns_wait_poll(adns, &head->query, &answer, NULL);
 190         else
 191           err= adns_wait(adns, &head->query, &answer, NULL);
 192       } else {
 193         err= adns_check(adns, &head->query, &answer, NULL);
 194       }
 195       if (err == EAGAIN) break;
 196       if (err) {
 197         fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err));
 198         exit(1);
 199       }
 200       printline(outf, head->start, head->addr, head->rest,
 201                 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 202       line= head; head= head->next;
 203       free(line);
 204       free(answer);
 205       len--;
 206     }
 207     if (!eof) {
 208       line= readline(inf, adns, opts);
 209       if (line) {
 210         if (!head) head= line;
 211         else tail->next= line;
 212         tail= line; len++;
 213       } else {
 214         eof= 1;
 215       }
 216     }
 217   }
 218   adns_finish(adns);
 219 }
 220
 221 static void printhelp(FILE *file) {
 222   fputs("usage: adnslogres [<options>] [<logfile>]\n"
 223         "       adnslogres --version|--help\n"
 224         "options: -c <concurrency>  set max number of outstanding queries\n"
 225         "         -p                use poll(2) instead of select(2)\n"
 226         "         -d                turn on debugging\n"
 227         "         -C <config>       use instead of contents of resolv.conf\n",
 228         stdout);
 229 }
 230
 231 static void usage(void) {
 232   printhelp(stderr);
 233   exit(1);
 234 }
 235
 236 int main(int argc, char *argv[]) {
 237   int c, opts, maxpending;
 238   extern char *optarg;
 239   FILE *inf;
 240
 241   if (argv[1] && !strncmp(argv[1],"--",2)) {
 242     if (!strcmp(argv[1],"--help")) {
 243       printhelp(stdout);
 244     } else if (!strcmp(argv[1],"--version")) {
 245       fputs(VERSION_MESSAGE("adnslogres"),stdout);
 246     } else {
 247       usage();
 248     }
 249     if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
 250     exit(0);
 251   }
 252
 253   maxpending= DEFMAXPENDING;
 254   opts= 0;
 255   while ((c= getopt(argc, argv, "c:C:dp")) != -1)
 256     switch (c) {
 257     case 'c':
 258       maxpending= atoi(optarg);
 259       if (maxpending < 1 || maxpending > MAXMAXPENDING) {
 260        fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
 261        exit(1);
 262       }
 263       break;
 264     case 'C':
 265       config_text= optarg;
 266       break;
 267     case 'd':
 268       opts|= OPT_DEBUG;
 269       break;
 270     case 'p':
 271       opts|= OPT_POLL;
 272       break;
 273     default:
 274       usage();
 275     }
 276
 277   argc-= optind;
 278   argv+= optind;
 279
 280   inf= NULL;
 281   if (argc == 0)
 282     inf= stdin;
 283   else if (argc == 1)
 284     inf= fopen(*argv, "r");
 285   else
 286     usage();
 287
 288   if (!inf)
 289     aargh("couldn't open input");
 290
 291   proclog(inf, stdout, maxpending, opts);
 292
 293   if (fclose(inf))
 294     aargh("fclose input");
 295   if (fclose(stdout))
 296     aargh("fclose output");
 297
 298   return 0;
 299 }