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) 1997-1999 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->tcpfailed & (~0UL << ads->nservers)));
  67   assert(qu->udpretries <= UDPMAXRETRIES);
  68   assert(qu->search_pos <= ads->nsearchlist);
  69   if (qu->parent) DLIST_ASSERTON(qu, child, qu->parent->children, siblings.);
  70 }
  71
  72 static void checkc_global(adns_state ads) {
  73   int i;
  74
  75   assert(ads->udpsocket >= 0);
  76
  77   for (i=0; i<ads->nsortlist; i++)
  78     assert(!(ads->sortlist[i].base.s_addr & ~ads->sortlist[i].mask.s_addr));
  79
  80   assert(ads->tcpserver >= 0 && ads->tcpserver < ads->nservers);
  81
  82   switch (ads->tcpstate) {
  83   case server_connecting:
  84     assert(ads->tcpsocket >= 0);
  85   case server_disconnected: /* fall through */
  86     assert(!ads->tcpsend.used);
  87     assert(!ads->tcprecv.used);
  88     assert(!ads->tcprecv_skip);
  89     break;
  90   case server_ok:
  91     assert(ads->tcpsocket >= 0);
  92     assert(ads->tcprecv_skip <= ads->tcprecv.used);
  93     break;
  94   default:
  95     assert(!"ads->tcpstate value");
  96   }
  97
  98   assert(ads->searchlist || !ads->nsearchlist);
  99 }
 100
 101 static void checkc_queue_timew(adns_state ads) {
 102   adns_query qu;
 103
 104   DLIST_CHECK(ads->timew, qu, , {
 105     switch (qu->state) {
 106     case query_tosend:
 107       assert(qu->udpsent);
 108       assert(!qu->tcpfailed);
 109       break;
 110     case query_tcpwait:
 111       assert(ads->tcpstate != server_ok);
 112       break;
 113     case query_tcpsent:
 114       break;
 115     default:
 116       assert(!"timew state");
 117     }
 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_childw(adns_state ads) {
 125   adns_query parent, child;
 126
 127   DLIST_CHECK(ads->childw, parent, , {
 128     assert(parent->state == query_child);
 129     assert(parent->children.head);
 130     DLIST_CHECK(parent->children, child, siblings., {
 131       assert(child->parent == parent);
 132       assert(child->state != query_done);
 133     });
 134     checkc_query(ads,parent);
 135     checkc_query_alloc(ads,parent);
 136   });
 137 }
 138
 139 static void checkc_queue_output(adns_state ads) {
 140   adns_query qu;
 141
 142   DLIST_CHECK(ads->output, qu, , {
 143     assert(qu->state == query_done);
 144     assert(!qu->children.head && !qu->children.tail);
 145     assert(!qu->parent);
 146     assert(!qu->allocations.head && !qu->allocations.tail);
 147     checkc_query(ads,qu);
 148   });
 149 }
 150
 151 void adns__consistency(adns_state ads, adns_query qu, consistency_checks cc) {
 152   adns_query search;
 153
 154   switch (cc) {
 155   case cc_user:
 156     break;
 157   case cc_entex:
 158     if (!(ads->iflags & adns_if_checkc_entex)) return;
 159     break;
 160   case cc_freq:
 161     if ((ads->iflags & adns_if_checkc_freq) != adns_if_checkc_freq) return;
 162     break;
 163   default:
 164     abort();
 165   }
 166
 167   checkc_global(ads);
 168   checkc_queue_timew(ads);
 169   checkc_queue_childw(ads);
 170   checkc_queue_output(ads);
 171
 172   if (qu) {
 173     switch (qu->state) {
 174     case query_tosend:
 175     case query_tcpwait:
 176     case query_tcpsent:
 177       DLIST_ASSERTON(qu, search, ads->timew, );
 178       break;
 179     case query_child:
 180       DLIST_ASSERTON(qu, search, ads->childw, );
 181       break;
 182     case query_done:
 183       DLIST_ASSERTON(qu, search, ads->output, );
 184       break;
 185     default:
 186       assert(!"specific query state");
 187     }
 188   }
 189 }