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1 From 65a01b71bb433c9466e4c78a73a8d8ed218ed4e8 Mon Sep 17 00:00:00 2001
2 From: Simon Kelley <simon@thekelleys.org.uk>
3 Date: Mon, 31 Dec 2018 23:56:33 +0000
4 Subject: [PATCH 19/32] Tidy address-union handling: move class into explicit
5 argument.
6
7 This moves the class argument to cache-insert into an argument,
8 rather then overloading a union in the address argument. Note that
9 tha class is NOT stored in the cache other than for DS/DNSKEY entries,
10 so must always be C_IN except for these. The data-extraction code
11 ensures this as it only attempts to cache C_IN class records.
12
13 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
14 ---
15 src/cache.c | 57 ++++++++++++++++++++++-----------------------------
16 src/dnsmasq.h | 2 +-
17 src/dnssec.c | 13 +++---------
18 src/rfc1035.c | 12 +++++------
19 4 files changed, 34 insertions(+), 50 deletions(-)
20
21 --- a/src/cache.c
22 +++ b/src/cache.c
23 @@ -26,7 +26,7 @@ static union bigname *big_free = NULL;
24 static int bignames_left, hash_size;
25
26 static void make_non_terminals(struct crec *source);
27 -static struct crec *really_insert(char *name, struct all_addr *addr,
28 +static struct crec *really_insert(char *name, struct all_addr *addr, unsigned short class,
29 time_t now, unsigned long ttl, unsigned short flags);
30
31 /* type->string mapping: this is also used by the name-hash function as a mixing table. */
32 @@ -330,8 +330,8 @@ static int is_expired(time_t now, struct
33 return 1;
34 }
35
36 -static struct crec *cache_scan_free(char *name, struct all_addr *addr, time_t now, unsigned short flags,
37 - struct crec **target_crec, unsigned int *target_uid)
38 +static struct crec *cache_scan_free(char *name, struct all_addr *addr, unsigned short class, time_t now,
39 + unsigned short flags, struct crec **target_crec, unsigned int *target_uid)
40 {
41 /* Scan and remove old entries.
42 If (flags & F_FORWARD) then remove any forward entries for name and any expired
43 @@ -350,6 +350,8 @@ static struct crec *cache_scan_free(char
44 This entry will get re-used with the same name, to preserve CNAMEs. */
45
46 struct crec *crecp, **up;
47 +
48 + (void)class;
49
50 if (flags & F_FORWARD)
51 {
52 @@ -381,7 +383,7 @@ static struct crec *cache_scan_free(char
53
54 #ifdef HAVE_DNSSEC
55 /* Deletion has to be class-sensitive for DS and DNSKEY */
56 - if ((flags & crecp->flags & (F_DNSKEY | F_DS)) && crecp->uid == addr->addr.dnssec.class)
57 + if ((flags & crecp->flags & (F_DNSKEY | F_DS)) && crecp->uid == class)
58 {
59 if (crecp->flags & F_CONFIG)
60 return crecp;
61 @@ -464,7 +466,7 @@ void cache_start_insert(void)
62 insert_error = 0;
63 }
64
65 -struct crec *cache_insert(char *name, struct all_addr *addr,
66 +struct crec *cache_insert(char *name, struct all_addr *addr, unsigned short class,
67 time_t now, unsigned long ttl, unsigned short flags)
68 {
69 /* Don't log DNSSEC records here, done elsewhere */
70 @@ -478,11 +480,11 @@ struct crec *cache_insert(char *name, st
71 ttl = daemon->min_cache_ttl;
72 }
73
74 - return really_insert(name, addr, now, ttl, flags);
75 + return really_insert(name, addr, class, now, ttl, flags);
76 }
77
78
79 -static struct crec *really_insert(char *name, struct all_addr *addr,
80 +static struct crec *really_insert(char *name, struct all_addr *addr, unsigned short class,
81 time_t now, unsigned long ttl, unsigned short flags)
82 {
83 struct crec *new, *target_crec = NULL;
84 @@ -497,7 +499,7 @@ static struct crec *really_insert(char *
85
86 /* First remove any expired entries and entries for the name/address we
87 are currently inserting. */
88 - if ((new = cache_scan_free(name, addr, now, flags, &target_crec, &target_uid)))
89 + if ((new = cache_scan_free(name, addr, class, now, flags, &target_crec, &target_uid)))
90 {
91 /* We're trying to insert a record over one from
92 /etc/hosts or DHCP, or other config. If the
93 @@ -553,21 +555,14 @@ static struct crec *really_insert(char *
94
95 if (freed_all)
96 {
97 - struct all_addr free_addr = new->addr.addr;;
98 -
99 -#ifdef HAVE_DNSSEC
100 - /* For DNSSEC records, addr holds class. */
101 - if (new->flags & (F_DS | F_DNSKEY))
102 - free_addr.addr.dnssec.class = new->uid;
103 -#endif
104 -
105 + /* For DNSSEC records, uid holds class. */
106 free_avail = 1; /* Must be free space now. */
107 - cache_scan_free(cache_get_name(new), &free_addr, now, new->flags, NULL, NULL);
108 + cache_scan_free(cache_get_name(new), &new->addr.addr, new->uid, now, new->flags, NULL, NULL);
109 daemon->metrics[METRIC_DNS_CACHE_LIVE_FREED]++;
110 }
111 else
112 {
113 - cache_scan_free(NULL, NULL, now, 0, NULL, NULL);
114 + cache_scan_free(NULL, NULL, class, now, 0, NULL, NULL);
115 freed_all = 1;
116 }
117 }
118 @@ -615,15 +610,13 @@ static struct crec *really_insert(char *
119 else
120 *cache_get_name(new) = 0;
121
122 - if (addr)
123 - {
124 #ifdef HAVE_DNSSEC
125 - if (flags & (F_DS | F_DNSKEY))
126 - new->uid = addr->addr.dnssec.class;
127 - else
128 + if (flags & (F_DS | F_DNSKEY))
129 + new->uid = class;
130 #endif
131 - new->addr.addr = *addr;
132 - }
133 +
134 + if (addr)
135 + new->addr.addr = *addr;
136
137 new->ttd = now + (time_t)ttl;
138 new->next = new_chain;
139 @@ -747,11 +740,11 @@ int cache_recv_insert(time_t now, int fd
140 {
141 if (!read_write(fd, (unsigned char *)&addr, sizeof(addr), 1))
142 return 0;
143 - crecp = really_insert(daemon->namebuff, &addr, now, ttl, flags);
144 + crecp = really_insert(daemon->namebuff, &addr, C_IN, now, ttl, flags);
145 }
146 else if (flags & F_CNAME)
147 {
148 - struct crec *newc = really_insert(daemon->namebuff, NULL, now, ttl, flags);
149 + struct crec *newc = really_insert(daemon->namebuff, NULL, C_IN, now, ttl, flags);
150 /* This relies on the fact the the target of a CNAME immediately preceeds
151 it because of the order of extraction in extract_addresses, and
152 the order reversal on the new_chain. */
153 @@ -780,10 +773,8 @@ int cache_recv_insert(time_t now, int fd
154
155 if (!read_write(fd, (unsigned char *)&class, sizeof(class), 1))
156 return 0;
157 - /* Cache needs to known class for DNSSEC stuff */
158 - addr.addr.dnssec.class = class;
159 -
160 - crecp = really_insert(daemon->namebuff, &addr, now, ttl, flags);
161 +
162 + crecp = really_insert(daemon->namebuff, NULL, class, now, ttl, flags);
163
164 if (flags & F_DNSKEY)
165 {
166 @@ -1463,7 +1454,7 @@ void cache_add_dhcp_entry(char *host_nam
167 }
168 else if (!(crec->flags & F_DHCP))
169 {
170 - cache_scan_free(host_name, NULL, 0, crec->flags & (flags | F_CNAME | F_FORWARD), NULL, NULL);
171 + cache_scan_free(host_name, NULL, C_IN, 0, crec->flags & (flags | F_CNAME | F_FORWARD), NULL, NULL);
172 /* scan_free deletes all addresses associated with name */
173 break;
174 }
175 @@ -1490,7 +1481,7 @@ void cache_add_dhcp_entry(char *host_nam
176 if (crec->flags & F_NEG)
177 {
178 flags |= F_REVERSE;
179 - cache_scan_free(NULL, (struct all_addr *)host_address, 0, flags, NULL, NULL);
180 + cache_scan_free(NULL, (struct all_addr *)host_address, C_IN, 0, flags, NULL, NULL);
181 }
182 }
183 else
184 --- a/src/dnsmasq.h
185 +++ b/src/dnsmasq.h
186 @@ -1144,7 +1144,7 @@ struct crec *cache_find_by_name(struct c
187 void cache_end_insert(void);
188 void cache_start_insert(void);
189 int cache_recv_insert(time_t now, int fd);
190 -struct crec *cache_insert(char *name, struct all_addr *addr,
191 +struct crec *cache_insert(char *name, struct all_addr *addr, unsigned short class,
192 time_t now, unsigned long ttl, unsigned short flags);
193 void cache_reload(void);
194 void cache_add_dhcp_entry(char *host_name, int prot, struct all_addr *host_address, time_t ttd);
195 --- a/src/dnssec.c
196 +++ b/src/dnssec.c
197 @@ -798,12 +798,9 @@ int dnssec_validate_by_ds(time_t now, st
198 algo = *p++;
199 keytag = dnskey_keytag(algo, flags, p, rdlen - 4);
200
201 - /* Cache needs to known class for DNSSEC stuff */
202 - a.addr.dnssec.class = class;
203 -
204 if ((key = blockdata_alloc((char*)p, rdlen - 4)))
205 {
206 - if (!(recp1 = cache_insert(name, &a, now, ttl, F_FORWARD | F_DNSKEY | F_DNSSECOK)))
207 + if (!(recp1 = cache_insert(name, &a, class, now, ttl, F_FORWARD | F_DNSKEY | F_DNSSECOK)))
208 {
209 blockdata_free(key);
210 return STAT_BOGUS;
211 @@ -927,12 +924,9 @@ int dnssec_validate_ds(time_t now, struc
212 algo = *p++;
213 digest = *p++;
214
215 - /* Cache needs to known class for DNSSEC stuff */
216 - a.addr.dnssec.class = class;
217 -
218 if ((key = blockdata_alloc((char*)p, rdlen - 4)))
219 {
220 - if (!(crecp = cache_insert(name, &a, now, ttl, F_FORWARD | F_DS | F_DNSSECOK)))
221 + if (!(crecp = cache_insert(name, NULL, class, now, ttl, F_FORWARD | F_DS | F_DNSSECOK)))
222 {
223 blockdata_free(key);
224 return STAT_BOGUS;
225 @@ -1021,8 +1015,7 @@ int dnssec_validate_ds(time_t now, struc
226 {
227 cache_start_insert();
228
229 - a.addr.dnssec.class = class;
230 - if (!cache_insert(name, &a, now, ttl, flags))
231 + if (!cache_insert(name, NULL, class, now, ttl, flags))
232 return STAT_BOGUS;
233
234 cache_end_insert();
235 --- a/src/rfc1035.c
236 +++ b/src/rfc1035.c
237 @@ -701,7 +701,7 @@ int extract_addresses(struct dns_header
238 goto cname_loop;
239 }
240
241 - cache_insert(name, &addr, now, cttl, name_encoding | secflag | F_REVERSE);
242 + cache_insert(name, &addr, C_IN, now, cttl, name_encoding | secflag | F_REVERSE);
243 found = 1;
244 }
245
246 @@ -719,7 +719,7 @@ int extract_addresses(struct dns_header
247 ttl = find_soa(header, qlen, NULL, doctored);
248 }
249 if (ttl)
250 - cache_insert(NULL, &addr, now, ttl, name_encoding | F_REVERSE | F_NEG | flags | (secure ? F_DNSSECOK : 0));
251 + cache_insert(NULL, &addr, C_IN, now, ttl, name_encoding | F_REVERSE | F_NEG | flags | (secure ? F_DNSSECOK : 0));
252 }
253 }
254 else
255 @@ -773,7 +773,7 @@ int extract_addresses(struct dns_header
256 {
257 if (!cname_count--)
258 return 0; /* looped CNAMES */
259 - newc = cache_insert(name, NULL, now, attl, F_CNAME | F_FORWARD | secflag);
260 + newc = cache_insert(name, NULL, C_IN, now, attl, F_CNAME | F_FORWARD | secflag);
261 if (newc)
262 {
263 newc->addr.cname.target.cache = NULL;
264 @@ -833,7 +833,7 @@ int extract_addresses(struct dns_header
265 }
266 #endif
267
268 - newc = cache_insert(name, &addr, now, attl, flags | F_FORWARD | secflag);
269 + newc = cache_insert(name, &addr, C_IN, now, attl, flags | F_FORWARD | secflag);
270 if (newc && cpp)
271 {
272 next_uid(newc);
273 @@ -860,7 +860,7 @@ int extract_addresses(struct dns_header
274 pointing at this, inherit its TTL */
275 if (ttl || cpp)
276 {
277 - newc = cache_insert(name, NULL, now, ttl ? ttl : cttl, F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0));
278 + newc = cache_insert(name, NULL, C_IN, now, ttl ? ttl : cttl, F_FORWARD | F_NEG | flags | (secure ? F_DNSSECOK : 0));
279 if (newc && cpp)
280 {
281 next_uid(newc);
282 @@ -1054,7 +1054,7 @@ int check_for_bogus_wildcard(struct dns_
283 /* Found a bogus address. Insert that info here, since there no SOA record
284 to get the ttl from in the normal processing */
285 cache_start_insert();
286 - cache_insert(name, NULL, now, ttl, F_IPV4 | F_FORWARD | F_NEG | F_NXDOMAIN);
287 + cache_insert(name, NULL, C_IN, now, ttl, F_IPV4 | F_FORWARD | F_NEG | F_NXDOMAIN);
288 cache_end_insert();
289
290 return 1;
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