| 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__consistency(ads,cc_user); } |
| 26 | |
| 27 | #define DLIST_CHECK(list, nodevar, part, body) \ |
| 28 | if ((list).head) { \ |
| 29 | assert(! (list).head->part back); \ |
| 30 | for ((nodevar)= (list).head; (nodevar); (nodevar)= (nodevar)->part next) { \ |
| 31 | assert((nodevar)->part next \ |
| 32 | ? (nodevar) == (nodevar)->part next->part back \ |
| 33 | : (nodevar) == (list).tail); \ |
| 34 | body \ |
| 35 | } \ |
| 36 | } |
| 37 | |
| 38 | static void checkc_query_alloc(adns_state ads, adns_query qu) { |
| 39 | allocnode *an; |
| 40 | |
| 41 | DLIST_CHECK(qu->allocations, an, , { |
| 42 | }); |
| 43 | } |
| 44 | |
| 45 | static void checkc_query(adns_state ads, adns_query qu) { |
| 46 | assert(qu->udpnextserver < ads->nservers); |
| 47 | assert(!(qu->udpsent & (~0UL << ads->nservers))); |
| 48 | assert(!(qu->tcpfailed & (~0UL << ads->nservers))); |
| 49 | assert(qu->udpretries <= UDPMAXRETRIES); |
| 50 | assert(qu->search_pos <= ads->nsearchlist); |
| 51 | } |
| 52 | |
| 53 | static void checkc_global(adns_state ads) { |
| 54 | int i; |
| 55 | |
| 56 | assert(ads->udpsocket >= 0); |
| 57 | |
| 58 | for (i=0; i<ads->nsortlist; i++) |
| 59 | assert(!(ads->sortlist[i].base.s_addr & ~ads->sortlist[i].mask.s_addr)); |
| 60 | |
| 61 | assert(ads->tcpserver >= 0 && ads->tcpserver < ads->nservers); |
| 62 | |
| 63 | switch (ads->tcpstate) { |
| 64 | case server_connecting: |
| 65 | assert(ads->tcpsocket >= 0); |
| 66 | case server_disconnected: /* fall through */ |
| 67 | assert(!ads->tcprecv.used); |
| 68 | assert(!ads->tcpsend.used); |
| 69 | break; |
| 70 | case server_ok: |
| 71 | assert(ads->tcpsocket >= 0); |
| 72 | break; |
| 73 | default: |
| 74 | assert(!"ads->tcpstate value"); |
| 75 | } |
| 76 | |
| 77 | assert(ads->searchlist || !ads->nsearchlist); |
| 78 | } |
| 79 | |
| 80 | static void checkc_queue_timew(adns_state ads) { |
| 81 | adns_query qu; |
| 82 | |
| 83 | DLIST_CHECK(ads->timew, qu, , { |
| 84 | switch (qu->state) { |
| 85 | case query_tosend: |
| 86 | assert(qu->udpsent); |
| 87 | assert(!qu->tcpfailed); |
| 88 | break; |
| 89 | case query_tcpwait: |
| 90 | assert(ads->tcpstate != server_ok); |
| 91 | break; |
| 92 | case query_tcpsent: |
| 93 | break; |
| 94 | default: |
| 95 | assert(!"timew state"); |
| 96 | } |
| 97 | assert(!qu->children.head && !qu->children.tail); |
| 98 | checkc_query(ads,qu); |
| 99 | checkc_query_alloc(ads,qu); |
| 100 | }); |
| 101 | } |
| 102 | |
| 103 | static void checkc_queue_childw(adns_state ads) { |
| 104 | adns_query parent, child; |
| 105 | |
| 106 | DLIST_CHECK(ads->childw, parent, , { |
| 107 | assert(parent->state == query_child); |
| 108 | assert(parent->children.head); |
| 109 | DLIST_CHECK(parent->children, child, siblings., { |
| 110 | assert(child->parent == parent); |
| 111 | assert(child->state != query_done); |
| 112 | }); |
| 113 | checkc_query(ads,parent); |
| 114 | checkc_query_alloc(ads,parent); |
| 115 | }); |
| 116 | } |
| 117 | |
| 118 | static void checkc_queue_output(adns_state ads) { |
| 119 | adns_query qu; |
| 120 | |
| 121 | DLIST_CHECK(ads->output, qu, , { |
| 122 | assert(qu->state == query_done); |
| 123 | assert(!qu->children.head && !qu->children.tail); |
| 124 | assert(!qu->parent); |
| 125 | checkc_query(ads,qu); |
| 126 | }); |
| 127 | } |
| 128 | |
| 129 | void adns__consistency(adns_state ads, consistency_checks cc) { |
| 130 | switch (cc) { |
| 131 | case cc_user: |
| 132 | break; |
| 133 | case cc_entex: |
| 134 | if (!(ads->iflags & adns_if_checkc_entex)) return; |
| 135 | break; |
| 136 | case cc_freq: |
| 137 | if ((ads->iflags & adns_if_checkc_freq) != adns_if_checkc_freq) return; |
| 138 | break; |
| 139 | default: |
| 140 | abort(); |
| 141 | } |
| 142 | |
| 143 | checkc_global(ads); |
| 144 | checkc_queue_timew(ads); |
| 145 | checkc_queue_childw(ads); |
| 146 | checkc_queue_output(ads); |
| 147 | } |