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1 | /* |
2 | * query.c |
3 | * - overall query management (allocation, completion) |
4 | * - per-query memory management |
5 | * - query submission and cancellation (user-visible and internal) |
6 | */ |
7 | /* |
8 | * This file is part of adns, which is Copyright (C) 1997, 1998 Ian Jackson |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2, or (at your option) |
13 | * any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software Foundation, |
22 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
23 | */ |
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24 | |
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25 | #include "internal.h" |
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26 | |
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27 | #include <stdlib.h> |
28 | #include <unistd.h> |
29 | #include <errno.h> |
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30 | |
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31 | #include <sys/time.h> |
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32 | |
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33 | #include "internal.h" |
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34 | |
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35 | int adns__internal_submit(adns_state ads, adns_query *query_r, |
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36 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
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37 | adns_queryflags flags, struct timeval now, |
38 | adns_status failstat, const qcontext *ctx) { |
39 | adns_query qu; |
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40 | |
41 | qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory; |
42 | qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory; |
43 | |
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44 | qu->ads= ads; |
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45 | qu->state= query_udp; |
46 | qu->back= qu->next= qu->parent= 0; |
47 | LIST_INIT(qu->children); |
48 | qu->siblings.next= qu->siblings.back= 0; |
49 | qu->allocations= 0; |
50 | qu->interim_allocd= 0; |
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51 | qu->final_allocspace= 0; |
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52 | |
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53 | qu->typei= typei; |
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54 | adns__vbuf_init(&qu->vb); |
55 | |
56 | qu->cname_dgram= 0; |
57 | qu->cname_dglen= qu->cname_begin= 0; |
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58 | |
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59 | qu->id= id; |
60 | qu->flags= flags; |
61 | qu->udpretries= 0; |
62 | qu->udpnextserver= 0; |
63 | qu->udpsent= qu->tcpfailed= 0; |
64 | timerclear(&qu->timeout); |
65 | memcpy(&qu->context,ctx,sizeof(qu->context)); |
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66 | |
67 | qu->answer->status= adns_s_ok; |
68 | qu->answer->cname= 0; |
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69 | qu->answer->type= typei->type; |
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70 | qu->answer->nrrs= 0; |
71 | qu->answer->rrs= 0; |
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72 | qu->answer->rrsz= typei->rrsz; |
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73 | |
74 | *query_r= qu; |
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75 | |
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76 | qu->query_dglen= qumsg_vb->used; |
77 | if (qumsg_vb->used) { |
78 | qu->query_dgram= malloc(qumsg_vb->used); |
79 | if (!qu->query_dgram) { |
80 | adns__query_fail(qu,adns_s_nolocalmem); |
81 | return adns_s_ok; |
82 | } |
83 | memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used); |
84 | } else { |
85 | qu->query_dgram= 0; |
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86 | } |
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87 | qu->vb= *qumsg_vb; |
88 | adns__vbuf_init(qumsg_vb); |
89 | |
90 | if (failstat) { |
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91 | adns__query_fail(qu,failstat); |
92 | return adns_s_ok; |
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93 | } |
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94 | adns__query_udp(qu,now); |
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95 | adns__autosys(ads,now); |
96 | |
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97 | return adns_s_ok; |
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98 | |
99 | x_freequ_nomemory: |
100 | free(qu); |
101 | x_nomemory: |
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102 | adns__vbuf_free(qumsg_vb); |
103 | return adns_s_nolocalmem; |
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104 | } |
105 | |
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106 | int adns_submit(adns_state ads, |
107 | const char *owner, |
108 | adns_rrtype type, |
109 | adns_queryflags flags, |
110 | void *context, |
111 | adns_query *query_r) { |
112 | qcontext ctx; |
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113 | int id, r, ol; |
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114 | vbuf vb; |
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115 | adns_status stat; |
116 | const typeinfo *typei; |
117 | struct timeval now; |
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118 | |
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119 | typei= adns__findtype(type); |
120 | if (!typei) return adns_s_notimplemented; |
121 | |
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122 | ctx.ext= context; |
123 | r= gettimeofday(&now,0); if (r) return errno; |
124 | id= 0; |
125 | |
126 | adns__vbuf_init(&vb); |
127 | |
128 | ol= strlen(owner); |
129 | if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_invaliddomain; goto xit; } |
130 | |
131 | if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; } |
132 | |
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133 | stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags); |
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134 | |
135 | xit: |
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136 | return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx); |
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137 | } |
138 | |
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139 | int adns_synchronous(adns_state ads, |
140 | const char *owner, |
141 | adns_rrtype type, |
142 | adns_queryflags flags, |
143 | adns_answer **answer_r) { |
144 | adns_query qu; |
145 | int r; |
146 | |
147 | r= adns_submit(ads,owner,type,flags,0,&qu); |
148 | if (r) return r; |
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149 | |
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150 | do { |
151 | r= adns_wait(ads,&qu,answer_r,0); |
152 | } while (r==EINTR); |
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153 | if (r) adns_cancel(qu); |
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154 | return r; |
155 | } |
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156 | |
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157 | void adns_cancel(adns_query query) { |
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158 | abort(); /* fixme */ |
159 | } |
160 | |
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161 | static void *alloc_common(adns_query qu, size_t sz) { |
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162 | allocnode *an; |
163 | |
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164 | if (!sz) return qu; /* Any old pointer will do */ |
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165 | assert(!qu->final_allocspace); |
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166 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
167 | if (!an) { |
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168 | adns__query_fail(qu,adns_s_nolocalmem); |
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169 | return 0; |
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170 | } |
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171 | an->next= qu->allocations; |
172 | qu->allocations= an; |
173 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
174 | } |
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175 | |
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176 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
177 | sz= MEM_ROUND(sz); |
178 | qu->interim_allocd += sz; |
179 | return alloc_common(qu,sz); |
180 | } |
181 | |
182 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
183 | return alloc_common(qu,MEM_ROUND(sz)); |
184 | } |
185 | |
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186 | void *adns__alloc_final(adns_query qu, size_t sz) { |
187 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
188 | * each allocation, and use final_allocspace to point to the next free |
189 | * bit. |
190 | */ |
191 | void *rp; |
192 | |
193 | sz= MEM_ROUND(sz); |
194 | rp= qu->final_allocspace; |
195 | assert(rp); |
196 | qu->interim_allocd -= sz; |
197 | assert(qu->interim_allocd>=0); |
198 | qu->final_allocspace= (byte*)rp + sz; |
199 | return rp; |
200 | } |
201 | |
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202 | void adns__reset_cnameonly(adns_query qu) { |
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203 | assert(qu->final_allocspace); |
204 | qu->answer->nrrs= 0; |
205 | qu->answer->rrs= 0; |
206 | qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0; |
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207 | } |
208 | |
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209 | void adns__query_done(adns_query qu) { |
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210 | adns_answer *ans; |
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211 | allocnode *an, *ann; |
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212 | int i; |
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213 | |
214 | qu->answer= ans= realloc(qu->answer, |
215 | MEM_ROUND(MEM_ROUND(sizeof(*ans)) + |
216 | qu->interim_allocd)); |
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217 | qu->final_allocspace= (byte*)qu->answer + MEM_ROUND(sizeof(*ans)); |
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218 | |
219 | adns__makefinal_str(qu,&ans->cname); |
220 | if (ans->nrrs) { |
221 | adns__makefinal_block(qu,&ans->rrs.untyped,ans->rrsz*ans->nrrs); |
222 | for (i=0; i<ans->nrrs; i++) |
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223 | qu->typei->makefinal(qu,ans->rrs.bytes+ans->rrsz*i); |
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224 | } |
225 | |
226 | for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); } |
227 | |
228 | adns__vbuf_free(&qu->vb); |
229 | |
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230 | qu->id= -1; |
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231 | LIST_LINK_TAIL(qu->ads->output,qu); |
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232 | } |
233 | |
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234 | void adns__query_fail(adns_query qu, adns_status stat) { |
235 | adns__reset_cnameonly(qu); |
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236 | qu->answer->status= stat; |
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237 | adns__query_done(qu); |
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238 | } |
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239 | |
240 | void adns__makefinal_str(adns_query qu, char **strp) { |
241 | int l; |
242 | char *before, *after; |
243 | |
244 | before= *strp; |
245 | l= strlen(before)+1; |
246 | after= adns__alloc_final(qu,l); |
247 | memcpy(after,before,l); |
248 | *strp= after; |
249 | } |
250 | |
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251 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
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252 | void *after; |
253 | |
254 | after= adns__alloc_final(qu,sz); |
255 | memcpy(after,*blpp,sz); |
256 | *blpp= after; |
257 | } |
258 | |