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wownero/external/unbound/util/data/msgreply.c

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/*
* util/data/msgreply.c - store message and reply data.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains a data structure to store a message and its reply.
*/
#include "config.h"
#include "util/data/msgreply.h"
#include "util/storage/lookup3.h"
#include "util/log.h"
#include "util/alloc.h"
#include "util/netevent.h"
#include "util/net_help.h"
#include "util/data/dname.h"
#include "util/regional.h"
#include "util/data/msgparse.h"
#include "util/data/msgencode.h"
#include "sldns/sbuffer.h"
#include "sldns/wire2str.h"
#include "util/module.h"
#include "util/fptr_wlist.h"
/** MAX TTL default for messages and rrsets */
time_t MAX_TTL = 3600 * 24 * 10; /* ten days */
/** MIN TTL default for messages and rrsets */
time_t MIN_TTL = 0;
/** MAX Negative TTL, for SOA records in authority section */
time_t MAX_NEG_TTL = 3600; /* one hour */
/** allocate qinfo, return 0 on error */
static int
parse_create_qinfo(sldns_buffer* pkt, struct msg_parse* msg,
struct query_info* qinf, struct regional* region)
{
if(msg->qname) {
if(region)
qinf->qname = (uint8_t*)regional_alloc(region,
msg->qname_len);
else qinf->qname = (uint8_t*)malloc(msg->qname_len);
if(!qinf->qname) return 0;
dname_pkt_copy(pkt, qinf->qname, msg->qname);
} else qinf->qname = 0;
qinf->qname_len = msg->qname_len;
qinf->qtype = msg->qtype;
qinf->qclass = msg->qclass;
qinf->local_alias = NULL;
return 1;
}
/** constructor for replyinfo */
struct reply_info*
construct_reply_info_base(struct regional* region, uint16_t flags, size_t qd,
time_t ttl, time_t prettl, size_t an, size_t ns, size_t ar,
size_t total, enum sec_status sec)
{
struct reply_info* rep;
/* rrset_count-1 because the first ref is part of the struct. */
size_t s = sizeof(struct reply_info) - sizeof(struct rrset_ref) +
sizeof(struct ub_packed_rrset_key*) * total;
if(total >= RR_COUNT_MAX) return NULL; /* sanity check on numRRS*/
if(region)
rep = (struct reply_info*)regional_alloc(region, s);
else rep = (struct reply_info*)malloc(s +
sizeof(struct rrset_ref) * (total));
if(!rep)
return NULL;
rep->flags = flags;
rep->qdcount = qd;
rep->ttl = ttl;
rep->prefetch_ttl = prettl;
rep->an_numrrsets = an;
rep->ns_numrrsets = ns;
rep->ar_numrrsets = ar;
rep->rrset_count = total;
rep->security = sec;
rep->authoritative = 0;
/* array starts after the refs */
if(region)
rep->rrsets = (struct ub_packed_rrset_key**)&(rep->ref[0]);
else rep->rrsets = (struct ub_packed_rrset_key**)&(rep->ref[total]);
/* zero the arrays to assist cleanup in case of malloc failure */
memset( rep->rrsets, 0, sizeof(struct ub_packed_rrset_key*) * total);
if(!region)
memset( &rep->ref[0], 0, sizeof(struct rrset_ref) * total);
return rep;
}
/** allocate replyinfo, return 0 on error */
static int
parse_create_repinfo(struct msg_parse* msg, struct reply_info** rep,
struct regional* region)
{
*rep = construct_reply_info_base(region, msg->flags, msg->qdcount, 0,
0, msg->an_rrsets, msg->ns_rrsets, msg->ar_rrsets,
msg->rrset_count, sec_status_unchecked);
if(!*rep)
return 0;
return 1;
}
int
reply_info_alloc_rrset_keys(struct reply_info* rep, struct alloc_cache* alloc,
struct regional* region)
{
size_t i;
for(i=0; i<rep->rrset_count; i++) {
if(region) {
rep->rrsets[i] = (struct ub_packed_rrset_key*)
regional_alloc(region,
sizeof(struct ub_packed_rrset_key));
if(rep->rrsets[i]) {
memset(rep->rrsets[i], 0,
sizeof(struct ub_packed_rrset_key));
rep->rrsets[i]->entry.key = rep->rrsets[i];
}
}
else rep->rrsets[i] = alloc_special_obtain(alloc);
if(!rep->rrsets[i])
return 0;
rep->rrsets[i]->entry.data = NULL;
}
return 1;
}
/** find the minimumttl in the rdata of SOA record */
static time_t
soa_find_minttl(struct rr_parse* rr)
{
uint16_t rlen = sldns_read_uint16(rr->ttl_data+4);
if(rlen < 20)
return 0; /* rdata too small for SOA (dname, dname, 5*32bit) */
/* minimum TTL is the last 32bit value in the rdata of the record */
/* at position ttl_data + 4(ttl) + 2(rdatalen) + rdatalen - 4(timeval)*/
return (time_t)sldns_read_uint32(rr->ttl_data+6+rlen-4);
}
/** do the rdata copy */
static int
rdata_copy(sldns_buffer* pkt, struct packed_rrset_data* data, uint8_t* to,
struct rr_parse* rr, time_t* rr_ttl, uint16_t type,
sldns_pkt_section section)
{
uint16_t pkt_len;
const sldns_rr_descriptor* desc;
*rr_ttl = sldns_read_uint32(rr->ttl_data);
/* RFC 2181 Section 8. if msb of ttl is set treat as if zero. */
if(*rr_ttl & 0x80000000U)
*rr_ttl = 0;
if(type == LDNS_RR_TYPE_SOA && section == LDNS_SECTION_AUTHORITY) {
/* negative response. see if TTL of SOA record larger than the
* minimum-ttl in the rdata of the SOA record */
if(*rr_ttl > soa_find_minttl(rr))
*rr_ttl = soa_find_minttl(rr);
if(*rr_ttl > MAX_NEG_TTL)
*rr_ttl = MAX_NEG_TTL;
}
if(*rr_ttl < MIN_TTL)
*rr_ttl = MIN_TTL;
if(*rr_ttl < data->ttl)
data->ttl = *rr_ttl;
if(rr->outside_packet) {
/* uncompressed already, only needs copy */
memmove(to, rr->ttl_data+sizeof(uint32_t), rr->size);
return 1;
}
sldns_buffer_set_position(pkt, (size_t)
(rr->ttl_data - sldns_buffer_begin(pkt) + sizeof(uint32_t)));
/* insert decompressed size into rdata len stored in memory */
/* -2 because rdatalen bytes are not included. */
pkt_len = htons(rr->size - 2);
memmove(to, &pkt_len, sizeof(uint16_t));
to += 2;
/* read packet rdata len */
pkt_len = sldns_buffer_read_u16(pkt);
if(sldns_buffer_remaining(pkt) < pkt_len)
return 0;
desc = sldns_rr_descript(type);
if(pkt_len > 0 && desc && desc->_dname_count > 0) {
int count = (int)desc->_dname_count;
int rdf = 0;
size_t len;
size_t oldpos;
/* decompress dnames. */
while(pkt_len > 0 && count) {
switch(desc->_wireformat[rdf]) {
case LDNS_RDF_TYPE_DNAME:
oldpos = sldns_buffer_position(pkt);
dname_pkt_copy(pkt, to,
sldns_buffer_current(pkt));
to += pkt_dname_len(pkt);
pkt_len -= sldns_buffer_position(pkt)-oldpos;
count--;
len = 0;
break;
case LDNS_RDF_TYPE_STR:
len = sldns_buffer_current(pkt)[0] + 1;
break;
default:
len = get_rdf_size(desc->_wireformat[rdf]);
break;
}
if(len) {
memmove(to, sldns_buffer_current(pkt), len);
to += len;
sldns_buffer_skip(pkt, (ssize_t)len);
log_assert(len <= pkt_len);
pkt_len -= len;
}
rdf++;
}
}
/* copy remaining rdata */
if(pkt_len > 0)
memmove(to, sldns_buffer_current(pkt), pkt_len);
return 1;
}
/** copy over the data into packed rrset */
static int
parse_rr_copy(sldns_buffer* pkt, struct rrset_parse* pset,
struct packed_rrset_data* data)
{
size_t i;
struct rr_parse* rr = pset->rr_first;
uint8_t* nextrdata;
size_t total = pset->rr_count + pset->rrsig_count;
data->ttl = MAX_TTL;
data->count = pset->rr_count;
data->rrsig_count = pset->rrsig_count;
data->trust = rrset_trust_none;
data->security = sec_status_unchecked;
/* layout: struct - rr_len - rr_data - rr_ttl - rdata - rrsig */
data->rr_len = (size_t*)((uint8_t*)data +
sizeof(struct packed_rrset_data));
data->rr_data = (uint8_t**)&(data->rr_len[total]);
data->rr_ttl = (time_t*)&(data->rr_data[total]);
nextrdata = (uint8_t*)&(data->rr_ttl[total]);
for(i=0; i<data->count; i++) {
data->rr_len[i] = rr->size;
data->rr_data[i] = nextrdata;
nextrdata += rr->size;
if(!rdata_copy(pkt, data, data->rr_data[i], rr,
&data->rr_ttl[i], pset->type, pset->section))
return 0;
rr = rr->next;
}
/* if rrsig, its rdata is at nextrdata */
rr = pset->rrsig_first;
for(i=data->count; i<total; i++) {
data->rr_len[i] = rr->size;
data->rr_data[i] = nextrdata;
nextrdata += rr->size;
if(!rdata_copy(pkt, data, data->rr_data[i], rr,
&data->rr_ttl[i], LDNS_RR_TYPE_RRSIG, pset->section))
return 0;
rr = rr->next;
}
return 1;
}
/** create rrset return 0 on failure */
static int
parse_create_rrset(sldns_buffer* pkt, struct rrset_parse* pset,
struct packed_rrset_data** data, struct regional* region)
{
/* allocate */
size_t s;
if(pset->rr_count > RR_COUNT_MAX || pset->rrsig_count > RR_COUNT_MAX ||
pset->size > RR_COUNT_MAX)
return 0; /* protect against integer overflow */
s = sizeof(struct packed_rrset_data) +
(pset->rr_count + pset->rrsig_count) *
(sizeof(size_t)+sizeof(uint8_t*)+sizeof(time_t)) +
pset->size;
if(region)
*data = regional_alloc(region, s);
else *data = malloc(s);
if(!*data)
return 0;
/* copy & decompress */
if(!parse_rr_copy(pkt, pset, *data)) {
if(!region) free(*data);
return 0;
}
return 1;
}
/** get trust value for rrset */
static enum rrset_trust
get_rrset_trust(struct msg_parse* msg, struct rrset_parse* rrset)
{
uint16_t AA = msg->flags & BIT_AA;
if(rrset->section == LDNS_SECTION_ANSWER) {
if(AA) {
/* RFC2181 says remainder of CNAME chain is nonauth*/
if(msg->rrset_first &&
msg->rrset_first->section==LDNS_SECTION_ANSWER
&& msg->rrset_first->type==LDNS_RR_TYPE_CNAME){
if(rrset == msg->rrset_first)
return rrset_trust_ans_AA;
else return rrset_trust_ans_noAA;
}
if(msg->rrset_first &&
msg->rrset_first->section==LDNS_SECTION_ANSWER
&& msg->rrset_first->type==LDNS_RR_TYPE_DNAME){
if(rrset == msg->rrset_first ||
rrset == msg->rrset_first->rrset_all_next)
return rrset_trust_ans_AA;
else return rrset_trust_ans_noAA;
}
return rrset_trust_ans_AA;
}
else return rrset_trust_ans_noAA;
} else if(rrset->section == LDNS_SECTION_AUTHORITY) {
if(AA) return rrset_trust_auth_AA;
else return rrset_trust_auth_noAA;
} else {
/* addit section */
if(AA) return rrset_trust_add_AA;
else return rrset_trust_add_noAA;
}
/* NOTREACHED */
return rrset_trust_none;
}
int
parse_copy_decompress_rrset(sldns_buffer* pkt, struct msg_parse* msg,
struct rrset_parse *pset, struct regional* region,
struct ub_packed_rrset_key* pk)
{
struct packed_rrset_data* data;
pk->rk.flags = pset->flags;
pk->rk.dname_len = pset->dname_len;
if(region)
pk->rk.dname = (uint8_t*)regional_alloc(
region, pset->dname_len);
else pk->rk.dname =
(uint8_t*)malloc(pset->dname_len);
if(!pk->rk.dname)
return 0;
/** copy & decompress dname */
dname_pkt_copy(pkt, pk->rk.dname, pset->dname);
/** copy over type and class */
pk->rk.type = htons(pset->type);
pk->rk.rrset_class = pset->rrset_class;
/** read data part. */
if(!parse_create_rrset(pkt, pset, &data, region))
return 0;
pk->entry.data = (void*)data;
pk->entry.key = (void*)pk;
pk->entry.hash = pset->hash;
data->trust = get_rrset_trust(msg, pset);
return 1;
}
/**
* Copy and decompress rrs
* @param pkt: the packet for compression pointer resolution.
* @param msg: the parsed message
* @param rep: reply info to put rrs into.
* @param region: if not NULL, used for allocation.
* @return 0 on failure.
*/
static int
parse_copy_decompress(sldns_buffer* pkt, struct msg_parse* msg,
struct reply_info* rep, struct regional* region)
{
size_t i;
struct rrset_parse *pset = msg->rrset_first;
struct packed_rrset_data* data;
log_assert(rep);
rep->ttl = MAX_TTL;
rep->security = sec_status_unchecked;
if(rep->rrset_count == 0)
rep->ttl = NORR_TTL;
for(i=0; i<rep->rrset_count; i++) {
if(!parse_copy_decompress_rrset(pkt, msg, pset, region,
rep->rrsets[i]))
return 0;
data = (struct packed_rrset_data*)rep->rrsets[i]->entry.data;
if(data->ttl < rep->ttl)
rep->ttl = data->ttl;
pset = pset->rrset_all_next;
}
rep->prefetch_ttl = PREFETCH_TTL_CALC(rep->ttl);
return 1;
}
int
parse_create_msg(sldns_buffer* pkt, struct msg_parse* msg,
struct alloc_cache* alloc, struct query_info* qinf,
struct reply_info** rep, struct regional* region)
{
log_assert(pkt && msg);
if(!parse_create_qinfo(pkt, msg, qinf, region))
return 0;
if(!parse_create_repinfo(msg, rep, region))
return 0;
if(!reply_info_alloc_rrset_keys(*rep, alloc, region))
return 0;
if(!parse_copy_decompress(pkt, msg, *rep, region))
return 0;
return 1;
}
int reply_info_parse(sldns_buffer* pkt, struct alloc_cache* alloc,
struct query_info* qinf, struct reply_info** rep,
struct regional* region, struct edns_data* edns)
{
/* use scratch pad region-allocator during parsing. */
struct msg_parse* msg;
int ret;
qinf->qname = NULL;
qinf->local_alias = NULL;
*rep = NULL;
if(!(msg = regional_alloc(region, sizeof(*msg)))) {
return LDNS_RCODE_SERVFAIL;
}
memset(msg, 0, sizeof(*msg));
sldns_buffer_set_position(pkt, 0);
if((ret = parse_packet(pkt, msg, region)) != 0) {
return ret;
}
if((ret = parse_extract_edns(msg, edns, region)) != 0)
return ret;
/* parse OK, allocate return structures */
/* this also performs dname decompression */
if(!parse_create_msg(pkt, msg, alloc, qinf, rep, NULL)) {
query_info_clear(qinf);
reply_info_parsedelete(*rep, alloc);
*rep = NULL;
return LDNS_RCODE_SERVFAIL;
}
return 0;
}
/** helper compare function to sort in lock order */
static int
reply_info_sortref_cmp(const void* a, const void* b)
{
struct rrset_ref* x = (struct rrset_ref*)a;
struct rrset_ref* y = (struct rrset_ref*)b;
if(x->key < y->key) return -1;
if(x->key > y->key) return 1;
return 0;
}
void
reply_info_sortref(struct reply_info* rep)
{
qsort(&rep->ref[0], rep->rrset_count, sizeof(struct rrset_ref),
reply_info_sortref_cmp);
}
void
reply_info_set_ttls(struct reply_info* rep, time_t timenow)
{
size_t i, j;
rep->ttl += timenow;
rep->prefetch_ttl += timenow;
for(i=0; i<rep->rrset_count; i++) {
struct packed_rrset_data* data = (struct packed_rrset_data*)
rep->ref[i].key->entry.data;
if(i>0 && rep->ref[i].key == rep->ref[i-1].key)
continue;
data->ttl += timenow;
for(j=0; j<data->count + data->rrsig_count; j++) {
data->rr_ttl[j] += timenow;
}
}
}
void
reply_info_parsedelete(struct reply_info* rep, struct alloc_cache* alloc)
{
size_t i;
if(!rep)
return;
/* no need to lock, since not shared in hashtables. */
for(i=0; i<rep->rrset_count; i++) {
ub_packed_rrset_parsedelete(rep->rrsets[i], alloc);
}
free(rep);
}
int
query_info_parse(struct query_info* m, sldns_buffer* query)
{
uint8_t* q = sldns_buffer_begin(query);
/* minimum size: header + \0 + qtype + qclass */
if(sldns_buffer_limit(query) < LDNS_HEADER_SIZE + 5)
return 0;
if(LDNS_OPCODE_WIRE(q) != LDNS_PACKET_QUERY ||
LDNS_QDCOUNT(q) != 1 || sldns_buffer_position(query) != 0)
return 0;
sldns_buffer_skip(query, LDNS_HEADER_SIZE);
m->qname = sldns_buffer_current(query);
if((m->qname_len = query_dname_len(query)) == 0)
return 0; /* parse error */
if(sldns_buffer_remaining(query) < 4)
return 0; /* need qtype, qclass */
m->qtype = sldns_buffer_read_u16(query);
m->qclass = sldns_buffer_read_u16(query);
m->local_alias = NULL;
return 1;
}
/** tiny subroutine for msgreply_compare */
#define COMPARE_IT(x, y) \
if( (x) < (y) ) return -1; \
else if( (x) > (y) ) return +1; \
log_assert( (x) == (y) );
int
query_info_compare(void* m1, void* m2)
{
struct query_info* msg1 = (struct query_info*)m1;
struct query_info* msg2 = (struct query_info*)m2;
int mc;
/* from most different to least different for speed */
COMPARE_IT(msg1->qtype, msg2->qtype);
if((mc = query_dname_compare(msg1->qname, msg2->qname)) != 0)
return mc;
log_assert(msg1->qname_len == msg2->qname_len);
COMPARE_IT(msg1->qclass, msg2->qclass);
return 0;
#undef COMPARE_IT
}
void
query_info_clear(struct query_info* m)
{
free(m->qname);
m->qname = NULL;
}
size_t
msgreply_sizefunc(void* k, void* d)
{
struct msgreply_entry* q = (struct msgreply_entry*)k;
struct reply_info* r = (struct reply_info*)d;
size_t s = sizeof(struct msgreply_entry) + sizeof(struct reply_info)
+ q->key.qname_len + lock_get_mem(&q->entry.lock)
- sizeof(struct rrset_ref);
s += r->rrset_count * sizeof(struct rrset_ref);
s += r->rrset_count * sizeof(struct ub_packed_rrset_key*);
return s;
}
void
query_entry_delete(void *k, void* ATTR_UNUSED(arg))
{
struct msgreply_entry* q = (struct msgreply_entry*)k;
lock_rw_destroy(&q->entry.lock);
query_info_clear(&q->key);
free(q);
}
void
reply_info_delete(void* d, void* ATTR_UNUSED(arg))
{
struct reply_info* r = (struct reply_info*)d;
free(r);
}
hashvalue_type
query_info_hash(struct query_info *q, uint16_t flags)
{
hashvalue_type h = 0xab;
h = hashlittle(&q->qtype, sizeof(q->qtype), h);
if(q->qtype == LDNS_RR_TYPE_AAAA && (flags&BIT_CD))
h++;
h = hashlittle(&q->qclass, sizeof(q->qclass), h);
h = dname_query_hash(q->qname, h);
return h;
}
struct msgreply_entry*
query_info_entrysetup(struct query_info* q, struct reply_info* r,
hashvalue_type h)
{
struct msgreply_entry* e = (struct msgreply_entry*)malloc(
sizeof(struct msgreply_entry));
if(!e) return NULL;
memcpy(&e->key, q, sizeof(*q));
e->entry.hash = h;
e->entry.key = e;
e->entry.data = r;
lock_rw_init(&e->entry.lock);
lock_protect(&e->entry.lock, &e->key, sizeof(e->key));
lock_protect(&e->entry.lock, &e->entry.hash, sizeof(e->entry.hash) +
sizeof(e->entry.key) + sizeof(e->entry.data));
lock_protect(&e->entry.lock, e->key.qname, e->key.qname_len);
q->qname = NULL;
return e;
}
/** copy rrsets from replyinfo to dest replyinfo */
static int
repinfo_copy_rrsets(struct reply_info* dest, struct reply_info* from,
struct regional* region)
{
size_t i, s;
struct packed_rrset_data* fd, *dd;
struct ub_packed_rrset_key* fk, *dk;
for(i=0; i<dest->rrset_count; i++) {
fk = from->rrsets[i];
dk = dest->rrsets[i];
fd = (struct packed_rrset_data*)fk->entry.data;
dk->entry.hash = fk->entry.hash;
dk->rk = fk->rk;
if(region) {
dk->id = fk->id;
dk->rk.dname = (uint8_t*)regional_alloc_init(region,
fk->rk.dname, fk->rk.dname_len);
} else
dk->rk.dname = (uint8_t*)memdup(fk->rk.dname,
fk->rk.dname_len);
if(!dk->rk.dname)
return 0;
s = packed_rrset_sizeof(fd);
if(region)
dd = (struct packed_rrset_data*)regional_alloc_init(
region, fd, s);
else dd = (struct packed_rrset_data*)memdup(fd, s);
if(!dd)
return 0;
packed_rrset_ptr_fixup(dd);
dk->entry.data = (void*)dd;
}
return 1;
}
struct reply_info*
reply_info_copy(struct reply_info* rep, struct alloc_cache* alloc,
struct regional* region)
{
struct reply_info* cp;
cp = construct_reply_info_base(region, rep->flags, rep->qdcount,
rep->ttl, rep->prefetch_ttl, rep->an_numrrsets,
rep->ns_numrrsets, rep->ar_numrrsets, rep->rrset_count,
rep->security);
if(!cp)
return NULL;
/* allocate ub_key structures special or not */
if(!reply_info_alloc_rrset_keys(cp, alloc, region)) {
if(!region)
reply_info_parsedelete(cp, alloc);
return NULL;
}
if(!repinfo_copy_rrsets(cp, rep, region)) {
if(!region)
reply_info_parsedelete(cp, alloc);
return NULL;
}
return cp;
}
uint8_t*
reply_find_final_cname_target(struct query_info* qinfo, struct reply_info* rep)
{
uint8_t* sname = qinfo->qname;
size_t snamelen = qinfo->qname_len;
size_t i;
for(i=0; i<rep->an_numrrsets; i++) {
struct ub_packed_rrset_key* s = rep->rrsets[i];
/* follow CNAME chain (if any) */
if(ntohs(s->rk.type) == LDNS_RR_TYPE_CNAME &&
ntohs(s->rk.rrset_class) == qinfo->qclass &&
snamelen == s->rk.dname_len &&
query_dname_compare(sname, s->rk.dname) == 0) {
get_cname_target(s, &sname, &snamelen);
}
}
if(sname != qinfo->qname)
return sname;
return NULL;
}
struct ub_packed_rrset_key*
reply_find_answer_rrset(struct query_info* qinfo, struct reply_info* rep)
{
uint8_t* sname = qinfo->qname;
size_t snamelen = qinfo->qname_len;
size_t i;
for(i=0; i<rep->an_numrrsets; i++) {
struct ub_packed_rrset_key* s = rep->rrsets[i];
/* first match type, for query of qtype cname */
if(ntohs(s->rk.type) == qinfo->qtype &&
ntohs(s->rk.rrset_class) == qinfo->qclass &&
snamelen == s->rk.dname_len &&
query_dname_compare(sname, s->rk.dname) == 0) {
return s;
}
/* follow CNAME chain (if any) */
if(ntohs(s->rk.type) == LDNS_RR_TYPE_CNAME &&
ntohs(s->rk.rrset_class) == qinfo->qclass &&
snamelen == s->rk.dname_len &&
query_dname_compare(sname, s->rk.dname) == 0) {
get_cname_target(s, &sname, &snamelen);
}
}
return NULL;
}
struct ub_packed_rrset_key* reply_find_rrset_section_an(struct reply_info* rep,
uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass)
{
size_t i;
for(i=0; i<rep->an_numrrsets; i++) {
struct ub_packed_rrset_key* s = rep->rrsets[i];
if(ntohs(s->rk.type) == type &&
ntohs(s->rk.rrset_class) == dclass &&
namelen == s->rk.dname_len &&
query_dname_compare(name, s->rk.dname) == 0) {
return s;
}
}
return NULL;
}
struct ub_packed_rrset_key* reply_find_rrset_section_ns(struct reply_info* rep,
uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass)
{
size_t i;
for(i=rep->an_numrrsets; i<rep->an_numrrsets+rep->ns_numrrsets; i++) {
struct ub_packed_rrset_key* s = rep->rrsets[i];
if(ntohs(s->rk.type) == type &&
ntohs(s->rk.rrset_class) == dclass &&
namelen == s->rk.dname_len &&
query_dname_compare(name, s->rk.dname) == 0) {
return s;
}
}
return NULL;
}
struct ub_packed_rrset_key* reply_find_rrset(struct reply_info* rep,
uint8_t* name, size_t namelen, uint16_t type, uint16_t dclass)
{
size_t i;
for(i=0; i<rep->rrset_count; i++) {
struct ub_packed_rrset_key* s = rep->rrsets[i];
if(ntohs(s->rk.type) == type &&
ntohs(s->rk.rrset_class) == dclass &&
namelen == s->rk.dname_len &&
query_dname_compare(name, s->rk.dname) == 0) {
return s;
}
}
return NULL;
}
void
log_dns_msg(const char* str, struct query_info* qinfo, struct reply_info* rep)
{
/* not particularly fast but flexible, make wireformat and print */
sldns_buffer* buf = sldns_buffer_new(65535);
struct regional* region = regional_create();
if(!reply_info_encode(qinfo, rep, 0, rep->flags, buf, 0,
region, 65535, 1)) {
log_info("%s: log_dns_msg: out of memory", str);
} else {
char* s = sldns_wire2str_pkt(sldns_buffer_begin(buf),
sldns_buffer_limit(buf));
if(!s) {
log_info("%s: log_dns_msg: ldns tostr failed", str);
} else {
log_info("%s %s", str, s);
}
free(s);
}
sldns_buffer_free(buf);
regional_destroy(region);
}
void
log_reply_info(enum verbosity_value v, struct query_info *qinf,
struct sockaddr_storage *addr, socklen_t addrlen, struct timeval dur,
int cached, struct sldns_buffer *rmsg)
{
char qname_buf[LDNS_MAX_DOMAINLEN+1];
char clientip_buf[128];
char rcode_buf[16];
char type_buf[16];
char class_buf[16];
size_t pktlen;
uint16_t rcode = FLAGS_GET_RCODE(sldns_buffer_read_u16_at(rmsg, 2));
if(verbosity < v)
return;
sldns_wire2str_rcode_buf((int)rcode, rcode_buf, sizeof(rcode_buf));
addr_to_str(addr, addrlen, clientip_buf, sizeof(clientip_buf));
if(rcode == LDNS_RCODE_FORMERR)
{
log_info("%s - - - %s - - - ", clientip_buf, rcode_buf);
} else {
dname_str(qinf->qname, qname_buf);
pktlen = sldns_buffer_limit(rmsg);
sldns_wire2str_type_buf(qinf->qtype, type_buf, sizeof(type_buf));
sldns_wire2str_class_buf(qinf->qclass, class_buf, sizeof(class_buf));
log_info("%s %s %s %s %s " ARG_LL "d.%6.6d %d %d",
clientip_buf, qname_buf, type_buf, class_buf,
rcode_buf, (long long)dur.tv_sec, (int)dur.tv_usec, cached, (int)pktlen);
}
}
void
log_query_info(enum verbosity_value v, const char* str,
struct query_info* qinf)
{
log_nametypeclass(v, str, qinf->qname, qinf->qtype, qinf->qclass);
}
int
reply_check_cname_chain(struct query_info* qinfo, struct reply_info* rep)
{
/* check only answer section rrs for matching cname chain.
* the cache may return changed rdata, but owner names are untouched.*/
size_t i;
uint8_t* sname = qinfo->qname;
size_t snamelen = qinfo->qname_len;
for(i=0; i<rep->an_numrrsets; i++) {
uint16_t t = ntohs(rep->rrsets[i]->rk.type);
if(t == LDNS_RR_TYPE_DNAME)
continue; /* skip dnames; note TTL 0 not cached */
/* verify that owner matches current sname */
if(query_dname_compare(sname, rep->rrsets[i]->rk.dname) != 0){
/* cname chain broken */
return 0;
}
/* if this is a cname; move on */
if(t == LDNS_RR_TYPE_CNAME) {
get_cname_target(rep->rrsets[i], &sname, &snamelen);
}
}
return 1;
}
int
reply_all_rrsets_secure(struct reply_info* rep)
{
size_t i;
for(i=0; i<rep->rrset_count; i++) {
if( ((struct packed_rrset_data*)rep->rrsets[i]->entry.data)
->security != sec_status_secure )
return 0;
}
return 1;
}
int edns_opt_append(struct edns_data* edns, struct regional* region,
uint16_t code, size_t len, uint8_t* data)
{
struct edns_option** prevp;
struct edns_option* opt;
/* allocate new element */
opt = (struct edns_option*)regional_alloc(region, sizeof(*opt));
if(!opt)
return 0;
opt->next = NULL;
opt->opt_code = code;
opt->opt_len = len;
opt->opt_data = NULL;
if(len > 0) {
opt->opt_data = regional_alloc_init(region, data, len);
if(!opt->opt_data)
return 0;
}
/* append at end of list */
prevp = &edns->opt_list;
while(*prevp != NULL)
prevp = &((*prevp)->next);
*prevp = opt;
return 1;
}
int edns_opt_list_append(struct edns_option** list, uint16_t code, size_t len,
uint8_t* data, struct regional* region)
{
struct edns_option** prevp;
struct edns_option* opt;
/* allocate new element */
opt = (struct edns_option*)regional_alloc(region, sizeof(*opt));
if(!opt)
return 0;
opt->next = NULL;
opt->opt_code = code;
opt->opt_len = len;
opt->opt_data = NULL;
if(len > 0) {
opt->opt_data = regional_alloc_init(region, data, len);
if(!opt->opt_data)
return 0;
}
/* append at end of list */
prevp = list;
while(*prevp != NULL) {
prevp = &((*prevp)->next);
}
*prevp = opt;
return 1;
}
int edns_opt_list_remove(struct edns_option** list, uint16_t code)
{
/* The list should already be allocated in a region. Freeing the
* allocated space in a region is not possible. We just unlink the
* required elements and they will be freed together with the region. */
struct edns_option* prev;
struct edns_option* curr;
if(!list || !(*list)) return 0;
/* Unlink and repoint if the element(s) are first in list */
while(list && *list && (*list)->opt_code == code) {
*list = (*list)->next;
}
if(!list || !(*list)) return 1;
/* Unlink elements and reattach the list */
prev = *list;
curr = (*list)->next;
while(curr != NULL) {
if(curr->opt_code == code) {
prev->next = curr->next;
curr = curr->next;
} else {
prev = curr;
curr = curr->next;
}
}
return 1;
}
static int inplace_cb_reply_call_generic(
struct inplace_cb* callback_list, enum inplace_cb_list_type type,
struct query_info* qinfo, struct module_qstate* qstate,
struct reply_info* rep, int rcode, struct edns_data* edns,
struct regional* region)
{
struct inplace_cb* cb;
struct edns_option* opt_list_out = NULL;
if(qstate)
opt_list_out = qstate->edns_opts_front_out;
for(cb=callback_list; cb; cb=cb->next) {
fptr_ok(fptr_whitelist_inplace_cb_reply_generic(
(inplace_cb_reply_func_type*)cb->cb, type));
(void)(*(inplace_cb_reply_func_type*)cb->cb)(qinfo, qstate, rep,
rcode, edns, &opt_list_out, region, cb->id, cb->cb_arg);
}
edns->opt_list = opt_list_out;
return 1;
}
int inplace_cb_reply_call(struct module_env* env, struct query_info* qinfo,
struct module_qstate* qstate, struct reply_info* rep, int rcode,
struct edns_data* edns, struct regional* region)
{
return inplace_cb_reply_call_generic(
env->inplace_cb_lists[inplace_cb_reply], inplace_cb_reply, qinfo,
qstate, rep, rcode, edns, region);
}
int inplace_cb_reply_cache_call(struct module_env* env,
struct query_info* qinfo, struct module_qstate* qstate,
struct reply_info* rep, int rcode, struct edns_data* edns,
struct regional* region)
{
return inplace_cb_reply_call_generic(
env->inplace_cb_lists[inplace_cb_reply_cache], inplace_cb_reply_cache,
qinfo, qstate, rep, rcode, edns, region);
}
int inplace_cb_reply_local_call(struct module_env* env,
struct query_info* qinfo, struct module_qstate* qstate,
struct reply_info* rep, int rcode, struct edns_data* edns,
struct regional* region)
{
return inplace_cb_reply_call_generic(
env->inplace_cb_lists[inplace_cb_reply_local], inplace_cb_reply_local,
qinfo, qstate, rep, rcode, edns, region);
}
int inplace_cb_reply_servfail_call(struct module_env* env,
struct query_info* qinfo, struct module_qstate* qstate,
struct reply_info* rep, int rcode, struct edns_data* edns,
struct regional* region)
{
/* We are going to servfail. Remove any potential edns options. */
if(qstate)
qstate->edns_opts_front_out = NULL;
return inplace_cb_reply_call_generic(
env->inplace_cb_lists[inplace_cb_reply_servfail],
inplace_cb_reply_servfail, qinfo, qstate, rep, rcode, edns, region);
}
int inplace_cb_query_call(struct module_env* env, struct query_info* qinfo,
uint16_t flags, struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* zone, size_t zonelen, struct module_qstate* qstate,
struct regional* region)
{
struct inplace_cb* cb = env->inplace_cb_lists[inplace_cb_query];
for(; cb; cb=cb->next) {
fptr_ok(fptr_whitelist_inplace_cb_query(
(inplace_cb_query_func_type*)cb->cb));
(void)(*(inplace_cb_query_func_type*)cb->cb)(qinfo, flags,
qstate, addr, addrlen, zone, zonelen, region,
cb->id, cb->cb_arg);
}
return 1;
}
int inplace_cb_edns_back_parsed_call(struct module_env* env,
struct module_qstate* qstate)
{
struct inplace_cb* cb =
env->inplace_cb_lists[inplace_cb_edns_back_parsed];
for(; cb; cb=cb->next) {
fptr_ok(fptr_whitelist_inplace_cb_edns_back_parsed(
(inplace_cb_edns_back_parsed_func_type*)cb->cb));
(void)(*(inplace_cb_edns_back_parsed_func_type*)cb->cb)(qstate,
cb->id, cb->cb_arg);
}
return 1;
}
int inplace_cb_query_response_call(struct module_env* env,
struct module_qstate* qstate, struct dns_msg* response) {
struct inplace_cb* cb =
env->inplace_cb_lists[inplace_cb_query_response];
for(; cb; cb=cb->next) {
fptr_ok(fptr_whitelist_inplace_cb_query_response(
(inplace_cb_query_response_func_type*)cb->cb));
(void)(*(inplace_cb_query_response_func_type*)cb->cb)(qstate,
response, cb->id, cb->cb_arg);
}
return 1;
}
struct edns_option* edns_opt_copy_region(struct edns_option* list,
struct regional* region)
{
struct edns_option* result = NULL, *cur = NULL, *s;
while(list) {
/* copy edns option structure */
s = regional_alloc_init(region, list, sizeof(*list));
if(!s) return NULL;
s->next = NULL;
/* copy option data */
if(s->opt_data) {
s->opt_data = regional_alloc_init(region, s->opt_data,
s->opt_len);
if(!s->opt_data)
return NULL;
}
/* link into list */
if(cur)
cur->next = s;
else result = s;
cur = s;
/* examine next element */
list = list->next;
}
return result;
}
int edns_opt_compare(struct edns_option* p, struct edns_option* q)
{
if(!p && !q) return 0;
if(!p) return -1;
if(!q) return 1;
log_assert(p && q);
if(p->opt_code != q->opt_code)
return (int)q->opt_code - (int)p->opt_code;
if(p->opt_len != q->opt_len)
return (int)q->opt_len - (int)p->opt_len;
if(p->opt_len != 0)
return memcmp(p->opt_data, q->opt_data, p->opt_len);
return 0;
}
int edns_opt_list_compare(struct edns_option* p, struct edns_option* q)
{
int r;
while(p && q) {
r = edns_opt_compare(p, q);
if(r != 0)
return r;
p = p->next;
q = q->next;
}
if(p || q) {
/* uneven length lists */
if(p) return 1;
if(q) return -1;
}
return 0;
}
void edns_opt_list_free(struct edns_option* list)
{
struct edns_option* n;
while(list) {
free(list->opt_data);
n = list->next;
free(list);
list = n;
}
}
struct edns_option* edns_opt_copy_alloc(struct edns_option* list)
{
struct edns_option* result = NULL, *cur = NULL, *s;
while(list) {
/* copy edns option structure */
s = memdup(list, sizeof(*list));
if(!s) {
edns_opt_list_free(result);
return NULL;
}
s->next = NULL;
/* copy option data */
if(s->opt_data) {
s->opt_data = memdup(s->opt_data, s->opt_len);
if(!s->opt_data) {
free(s);
edns_opt_list_free(result);
return NULL;
}
}
/* link into list */
if(cur)
cur->next = s;
else result = s;
cur = s;
/* examine next element */
list = list->next;
}
return result;
}
struct edns_option* edns_opt_list_find(struct edns_option* list, uint16_t code)
{
struct edns_option* p;
for(p=list; p; p=p->next) {
if(p->opt_code == code)
return p;
}
return NULL;
}
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