src/check.c

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