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->tcprecv.used);
  87     assert(!ads->tcpsend.used);
  88     break;
  89   case server_ok:
  90     assert(ads->tcpsocket >= 0);
  91     break;
  92   default:
  93     assert(!"ads->tcpstate value");
  94   }
  95
  96   assert(ads->searchlist || !ads->nsearchlist);
  97 }
  98
  99 static void checkc_queue_timew(adns_state ads) {
 100   adns_query qu;
 101
 102   DLIST_CHECK(ads->timew, qu, , {
 103     switch (qu->state) {
 104     case query_tosend:
 105       assert(qu->udpsent);
 106       assert(!qu->tcpfailed);
 107       break;
 108     case query_tcpwait:
 109       assert(ads->tcpstate != server_ok);
 110       break;
 111     case query_tcpsent:
 112       break;
 113     default:
 114       assert(!"timew state");
 115     }
 116     assert(!qu->children.head && !qu->children.tail);
 117     checkc_query(ads,qu);
 118     checkc_query_alloc(ads,qu);
 119   });
 120 }
 121
 122 static void checkc_queue_childw(adns_state ads) {
 123   adns_query parent, child;
 124
 125   DLIST_CHECK(ads->childw, parent, , {
 126     assert(parent->state == query_child);
 127     assert(parent->children.head);
 128     DLIST_CHECK(parent->children, child, siblings., {
 129       assert(child->parent == parent);
 130       assert(child->state != query_done);
 131     });
 132     checkc_query(ads,parent);
 133     checkc_query_alloc(ads,parent);
 134   });
 135 }
 136
 137 static void checkc_queue_output(adns_state ads) {
 138   adns_query qu;
 139
 140   DLIST_CHECK(ads->output, qu, , {
 141     assert(qu->state == query_done);
 142     assert(!qu->children.head && !qu->children.tail);
 143     assert(!qu->parent);
 144     assert(!qu->allocations.head && !qu->allocations.tail);
 145     checkc_query(ads,qu);
 146   });
 147 }
 148
 149 void adns__consistency(adns_state ads, adns_query qu, consistency_checks cc) {
 150   adns_query search;
 151
 152   switch (cc) {
 153   case cc_user:
 154     break;
 155   case cc_entex:
 156     if (!(ads->iflags & adns_if_checkc_entex)) return;
 157     break;
 158   case cc_freq:
 159     if ((ads->iflags & adns_if_checkc_freq) != adns_if_checkc_freq) return;
 160     break;
 161   default:
 162     abort();
 163   }
 164
 165   checkc_global(ads);
 166   checkc_queue_timew(ads);
 167   checkc_queue_childw(ads);
 168   checkc_queue_output(ads);
 169
 170   if (qu) {
 171     switch (qu->state) {
 172     case query_tosend:
 173     case query_tcpwait:
 174     case query_tcpsent:
 175       DLIST_ASSERTON(qu, search, ads->timew, );
 176       break;
 177     case query_child:
 178       DLIST_ASSERTON(qu, search, ads->childw, );
 179       break;
 180     case query_done:
 181       DLIST_ASSERTON(qu, search, ads->output, );
 182       break;
 183     default:
 184       assert(!"specific query state");
 185     }
 186   }
 187 }