src/check.c

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