mdw@git.distorted.org.uk Git - adns/blob - src/check.c

   1 /*
   2  * check.c
   3  * - consistency checks
   4  */
   5 /*
   6  *  This file is part of adns, which is
   7  *    Copyright (C) 1997-2000,2003,2006  Ian Jackson
   8  *    Copyright (C) 1999-2000,2003,2006  Tony Finch
   9  *    Copyright (C) 1991 Massachusetts Institute of Technology
  10  *  (See the file INSTALL for full details.)
  11  *
  12  *  This program is free software; you can redistribute it and/or modify
  13  *  it under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2, or (at your option)
  15  *  any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *  GNU General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software Foundation,
  24  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 #include "internal.h"
  28
  29 void adns_checkconsistency(adns_state ads, adns_query qu) {
  30   adns__consistency(ads,qu,cc_user);
  31 }
  32
  33 #define DLIST_CHECK(list, nodevar, part, body)                  \
  34   if ((list).head) {                                            \
  35     assert(! (list).head->part back);                           \
  36     for ((nodevar)= (list).head;                                \
  37          (nodevar);                                             \
  38          (nodevar)= (nodevar)->part next) {                     \
  39       assert((nodevar)->part next                               \
  40              ? (nodevar) == (nodevar)->part next->part back     \
  41              : (nodevar) == (list).tail);                       \
  42       body                                                      \
  43     }                                                           \
  44   }
  45
  46 #define DLIST_ASSERTON(node, nodevar, list, part)       \
  47   do {                                                  \
  48     for ((nodevar)= (list).head;                        \
  49          (nodevar) != (node);                           \
  50          (nodevar)= (nodevar)->part next) {             \
  51       assert((nodevar));                                \
  52     }                                                   \
  53   } while(0)
  54
  55 static void checkc_query_alloc(adns_state ads, adns_query qu) {
  56   allocnode *an;
  57
  58   DLIST_CHECK(qu->allocations, an, , {
  59   });
  60 }
  61
  62 static void checkc_query(adns_state ads, adns_query qu) {
  63   adns_query child;
  64
  65   assert(qu->udpnextserver < ads->nservers);
  66   assert(!(qu->udpsent & (~0UL << ads->nservers)));
  67   assert(qu->search_pos <= ads->nsearchlist);
  68   if (qu->parent) DLIST_ASSERTON(qu, child, qu->parent->children, siblings.);
  69 }
  70
  71 static void checkc_notcpbuf(adns_state ads) {
  72   assert(!ads->tcpsend.used);
  73   assert(!ads->tcprecv.used);
  74   assert(!ads->tcprecv_skip);
  75 }
  76
  77 static void checkc_global(adns_state ads) {
  78   const struct sortlist *sl;
  79   int i;
  80
  81   assert(ads->udpsocket >= 0);
  82
  83   for (i=0; i<ads->nsortlist; i++) {
  84     sl= &ads->sortlist[i];
  85     assert(adns__addr_match_p(sl->af,&sl->base, sl->af,&sl->base,&sl->mask));
  86   }
  87
  88   assert(ads->tcpserver >= 0 && ads->tcpserver < ads->nservers);
  89
  90   switch (ads->tcpstate) {
  91   case server_connecting:
  92     assert(ads->tcpsocket >= 0);
  93     checkc_notcpbuf(ads);
  94     break;
  95   case server_disconnected:
  96   case server_broken:
  97     assert(ads->tcpsocket == -1);
  98     checkc_notcpbuf(ads);
  99     break;
 100   case server_ok:
 101     assert(ads->tcpsocket >= 0);
 102     assert(ads->tcprecv_skip <= ads->tcprecv.used);
 103     break;
 104   default:
 105     assert(!"ads->tcpstate value");
 106   }
 107
 108   assert(ads->searchlist || !ads->nsearchlist);
 109 }
 110
 111 static void checkc_queue_udpw(adns_state ads) {
 112   adns_query qu;
 113
 114   DLIST_CHECK(ads->udpw, qu, , {
 115     assert(qu->state==query_tosend);
 116     assert(qu->retries <= UDPMAXRETRIES);
 117     assert(qu->udpsent);
 118     assert(!qu->children.head && !qu->children.tail);
 119     checkc_query(ads,qu);
 120     checkc_query_alloc(ads,qu);
 121   });
 122 }
 123
 124 static void checkc_queue_tcpw(adns_state ads) {
 125   adns_query qu;
 126
 127   DLIST_CHECK(ads->tcpw, qu, , {
 128     assert(qu->state==query_tcpw);
 129     assert(!qu->children.head && !qu->children.tail);
 130     assert(qu->retries <= ads->nservers+1);
 131     checkc_query(ads,qu);
 132     checkc_query_alloc(ads,qu);
 133   });
 134 }
 135
 136 static void checkc_queue_childw(adns_state ads) {
 137   adns_query parent, child;
 138
 139   DLIST_CHECK(ads->childw, parent, , {
 140     assert(parent->state == query_childw);
 141     assert(parent->children.head);
 142     DLIST_CHECK(parent->children, child, siblings., {
 143       assert(child->parent == parent);
 144       assert(child->state != query_done);
 145     });
 146     checkc_query(ads,parent);
 147     checkc_query_alloc(ads,parent);
 148   });
 149 }
 150
 151 static void checkc_query_done(adns_state ads, adns_query qu) {
 152   assert(qu->state == query_done);
 153   assert(!qu->children.head && !qu->children.tail);
 154   checkc_query(ads,qu);
 155 }
 156
 157 static void checkc_queue_output(adns_state ads) {
 158   adns_query qu;
 159
 160   DLIST_CHECK(ads->output, qu, , {
 161     assert(!qu->parent);
 162     assert(!qu->allocations.head && !qu->allocations.tail);
 163     checkc_query_done(ads,qu);
 164   });
 165 }
 166
 167 static void checkc_queue_intdone(adns_state ads) {
 168   adns_query qu;
 169
 170   DLIST_CHECK(ads->intdone, qu, , {
 171     assert(qu->parent);
 172     assert(qu->ctx.callback);
 173     checkc_query_done(ads,qu);
 174   });
 175 }
 176
 177 void adns__consistency(adns_state ads, adns_query qu, consistency_checks cc) {
 178   adns_query search;
 179
 180   switch (cc) {
 181   case cc_user:
 182     break;
 183   case cc_entex:
 184     if (!(ads->iflags & adns_if_checkc_entex)) return;
 185     assert(!ads->intdone.head);
 186     break;
 187   case cc_freq:
 188     if ((ads->iflags & adns_if_checkc_freq) != adns_if_checkc_freq) return;
 189     break;
 190   default:
 191     abort();
 192   }
 193
 194   checkc_global(ads);
 195   checkc_queue_udpw(ads);
 196   checkc_queue_tcpw(ads);
 197   checkc_queue_childw(ads);
 198   checkc_queue_output(ads);
 199   checkc_queue_intdone(ads);
 200
 201   if (qu) {
 202     switch (qu->state) {
 203     case query_tosend:
 204       DLIST_ASSERTON(qu, search, ads->udpw, );
 205       break;
 206     case query_tcpw:
 207       DLIST_ASSERTON(qu, search, ads->tcpw, );
 208       break;
 209     case query_childw:
 210       DLIST_ASSERTON(qu, search, ads->childw, );
 211       break;
 212     case query_done:
 213       if (qu->parent)
 214         DLIST_ASSERTON(qu, search, ads->intdone, );
 215       else
 216         DLIST_ASSERTON(qu, search, ads->output, );
 217       break;
 218     default:
 219       assert(!"specific query state");
 220     }
 221   }
 222 }