C++ LDNS_FREE函数代码示例

uint8_t *
ldns_udp_read_wire(int sockfd, size_t *size, struct sockaddr_storage *from,
		socklen_t *fromlen)
{
	uint8_t *wire, *wireout;
	ssize_t wire_size;

	wire = LDNS_XMALLOC(uint8_t, LDNS_MAX_PACKETLEN);
	if (!wire) {
		*size = 0;
		return NULL;
	}

	wire_size = recvfrom(sockfd, (void*)wire, LDNS_MAX_PACKETLEN, 0, 
			(struct sockaddr *)from, fromlen);

	/* recvfrom can also return 0 */
	if (wire_size == -1 || wire_size == 0) {
		*size = 0;
		LDNS_FREE(wire);
		return NULL;
	}

	*size = (size_t)wire_size;
	wireout = LDNS_XREALLOC(wire, uint8_t, (size_t)wire_size);
	if(!wireout) LDNS_FREE(wire);

	return wireout;
}

ssize_t
ldns_fget_keyword_data_l(FILE *f, const char *keyword, const char *k_del, char *data,
               const char *d_del, size_t data_limit, int *line_nr)
{
       /* we assume: keyword|sep|data */
       char *fkeyword;
       ssize_t i;

       if(strlen(keyword) >= LDNS_MAX_KEYWORDLEN)
               return -1;
       fkeyword = LDNS_XMALLOC(char, LDNS_MAX_KEYWORDLEN);
       if(!fkeyword)
               return -1;

       i = ldns_fget_token(f, fkeyword, k_del, LDNS_MAX_KEYWORDLEN);
       if(i==0 || i==-1) {
               LDNS_FREE(fkeyword);
               return -1;
       }

       /* case??? i instead of strlen? */
       if (strncmp(fkeyword, keyword, LDNS_MAX_KEYWORDLEN - 1) == 0) {
               /* whee! */
               /* printf("%s\n%s\n", "Matching keyword", fkeyword); */
               i = ldns_fget_token_l(f, data, d_del, data_limit, line_nr);
               LDNS_FREE(fkeyword);
               return i;
       } else {
               /*printf("no match for %s (read: %s)\n", keyword, fkeyword);*/
               LDNS_FREE(fkeyword);
               return -1;
       }
}

ssize_t
ldns_bget_keyword_data(ldns_buffer *b, const char *keyword, const char *k_del, char
*data, const char *d_del, size_t data_limit)
{
       /* we assume: keyword|sep|data */
       char *fkeyword;
       ssize_t i;

       if(strlen(keyword) >= LDNS_MAX_KEYWORDLEN)
               return -1;
       fkeyword = LDNS_XMALLOC(char, LDNS_MAX_KEYWORDLEN);
       if(!fkeyword)
               return -1; /* out of memory */

       i = ldns_bget_token(b, fkeyword, k_del, data_limit);
       if(i==0 || i==-1) {
               LDNS_FREE(fkeyword);
               return -1; /* nothing read */
       }

       /* case??? */
       if (strncmp(fkeyword, keyword, strlen(keyword)) == 0) {
               LDNS_FREE(fkeyword);
               /* whee, the match! */
               /* retrieve it's data */
               i = ldns_bget_token(b, data, d_del, 0);
               return i;
       } else {
               LDNS_FREE(fkeyword);
               return -1;
       }
}

uint8_t *
ldns_tcp_read_wire_timeout(int sockfd, size_t *size, struct timeval timeout)
{
	uint8_t *wire;
	uint16_t wire_size;
	ssize_t bytes = 0, rc = 0;

	wire = LDNS_XMALLOC(uint8_t, 2);
	if (!wire) {
		*size = 0;
		return NULL;
	}
	
	while (bytes < 2) {
		if(!ldns_sock_wait(sockfd, timeout, 0)) {
			*size = 0;
			LDNS_FREE(wire);
			return NULL;
		}
		rc = recv(sockfd, (void*) (wire + bytes), 
				(size_t) (2 - bytes), 0);
		if (rc == -1 || rc == 0) {
			*size = 0;
			LDNS_FREE(wire);
			return NULL;
		}
                bytes += rc;
	}

	wire_size = ldns_read_uint16(wire);
	
	LDNS_FREE(wire);
	wire = LDNS_XMALLOC(uint8_t, wire_size);
	if (!wire) {
		*size = 0;
		return NULL;
	}
	bytes = 0;

	while (bytes < (ssize_t) wire_size) {
		if(!ldns_sock_wait(sockfd, timeout, 0)) {
			*size = 0;
			LDNS_FREE(wire);
			return NULL;
		}
		rc = recv(sockfd, (void*) (wire + bytes), 
				(size_t) (wire_size - bytes), 0);
		if (rc == -1 || rc == 0) {
			LDNS_FREE(wire);
			*size = 0;
			return NULL;
		}
                bytes += rc;
	}
	
	*size = (size_t) bytes;
	return wire;
}

void
free_match_files()
{
	size_t i;
	for (i = 0; i < match_file_count; i++) {
		LDNS_FREE(match_files[i].description);
		LDNS_FREE(match_files[i].query_match);
		LDNS_FREE(match_files[i].answer_match);
	}
}

void
ldns_buffer_free(ldns_buffer *buffer)
{
	if (!buffer) {
		return;
	}

	if (!buffer->_fixed)
		LDNS_FREE(buffer->_data);

	LDNS_FREE(buffer);
}

void
ldns_dnssec_zone_deep_free(ldns_dnssec_zone *zone)
{
	if (zone) {
		if (zone->names) {
			/* destroy all name structures within the tree */
			ldns_traverse_postorder(zone->names,
						    ldns_dnssec_name_node_deep_free,
						    NULL);
			LDNS_FREE(zone->names);
		}
		LDNS_FREE(zone);
	}
}

/* keep in mind that in DNS tcp messages the first 2 bytes signal the
 * amount data to expect
 */
static ldns_status
ldns_tcp_send_from(uint8_t **result,  ldns_buffer *qbin,
	       	const struct sockaddr_storage *to, socklen_t tolen,
	       	const struct sockaddr_storage *from, socklen_t fromlen,
		struct timeval timeout, size_t *answer_size)
{
	int sockfd;
	uint8_t *answer;
	
	sockfd = ldns_tcp_bgsend_from(qbin, to, tolen, from, fromlen, timeout);
	
	if (sockfd == 0) {
		return LDNS_STATUS_ERR;
	}

	answer = ldns_tcp_read_wire_timeout(sockfd, answer_size, timeout);
#ifndef USE_WINSOCK
	close(sockfd);
#else
	closesocket(sockfd);
#endif

	if (*answer_size == 0) {
		/* oops */
		return LDNS_STATUS_NETWORK_ERR;
	}

	/* resize accordingly */
	*result = LDNS_XREALLOC(answer, uint8_t, (size_t)*answer_size);
        if(!*result) {
                LDNS_FREE(answer);
                return LDNS_STATUS_MEM_ERR;
        }
	return LDNS_STATUS_OK;
}

static void
ldns_dnssec_zone_hashed_names_from_nsec3(
		ldns_dnssec_zone* zone, ldns_rr* nsec3rr)
{
	ldns_rbnode_t* current_node;
	ldns_dnssec_name* current_name;

	assert(zone != NULL);
	assert(nsec3rr != NULL);

	if (zone->hashed_names) {
		ldns_traverse_postorder(zone->hashed_names,
				ldns_hashed_names_node_free, NULL);
		LDNS_FREE(zone->hashed_names);
	}
	zone->_nsec3params = nsec3rr;

	/* So this is a NSEC3 zone.
	* Calculate hashes for all names already in the zone
	*/
	zone->hashed_names = ldns_rbtree_create(ldns_dname_compare_v);
	if (zone->hashed_names == NULL) {
		return;
	}
	for ( current_node  = ldns_rbtree_first(zone->names)
	    ; current_node != LDNS_RBTREE_NULL
	    ; current_node  = ldns_rbtree_next(current_node)
	    ) {
		current_name = (ldns_dnssec_name *) current_node->data;
		ldns_dnssec_name_make_hashed_name(zone, current_name, nsec3rr);

	}
}

static void
ldns_dnssec_name_make_hashed_name(ldns_dnssec_zone *zone,
		ldns_dnssec_name* name, ldns_rr* nsec3rr)
{
	ldns_rbnode_t* new_node;

	assert(name != NULL);
	if (! zone->_nsec3params) {
		if (! nsec3rr) {
			return;
		}
		ldns_dnssec_zone_hashed_names_from_nsec3(zone, nsec3rr);

	} else if (! nsec3rr) {
		nsec3rr = zone->_nsec3params;
	}
	name->hashed_name = ldns_nsec3_hash_name_frm_nsec3(nsec3rr, name->name);

	/* Also store in zone->hashed_names */
	if ((new_node = LDNS_MALLOC(ldns_rbnode_t))) {

		new_node->key  = name->hashed_name;
		new_node->data = name;

		if (ldns_rbtree_insert(zone->hashed_names, new_node) == NULL) {

				LDNS_FREE(new_node);
		}
	}
}

void
ldns_zone_deep_free(ldns_zone *zone) 
{
	ldns_rr_free(zone->_soa);
	ldns_rr_list_deep_free(zone->_rrs);
	LDNS_FREE(zone);
}

INLINE void
ldns_dnssec_name_free_internal(ldns_dnssec_name *name,
                               int deep)
{
	if (name) {
		if (name->name_alloced) {
			ldns_rdf_deep_free(name->name);
		}
		if (name->rrsets) {
			ldns_dnssec_rrsets_free_internal(name->rrsets, deep);
		}
		if (name->nsec && deep) {
			ldns_rr_free(name->nsec);
		}
		if (name->nsec_signatures) {
			ldns_dnssec_rrs_free_internal(name->nsec_signatures, deep);
		}
		if (name->hashed_name) {
			if (deep) {
				ldns_rdf_deep_free(name->hashed_name);
			}
		}
		LDNS_FREE(name);
	}
}

/**
 * Sign data with DSA
 *
 * \param[in] to_sign The ldns_buffer containing raw data that is
 *                    to be signed
 * \param[in] key The DSA key structure to sign with
 * \return ldns_rdf for the RRSIG ldns_rr
 */
ldns_rdf *
ldns_sign_public_dsa(ldns_buffer *to_sign, DSA *key)
{
	unsigned char *sha1_hash;
	ldns_rdf *sigdata_rdf;
	ldns_buffer *b64sig;

	DSA_SIG *sig;
	uint8_t *data;
	size_t pad;

	b64sig = ldns_buffer_new(LDNS_MAX_PACKETLEN);
	if (!b64sig) {
		return NULL;
	}

	sha1_hash = SHA1((unsigned char*)ldns_buffer_begin(to_sign),
				  ldns_buffer_position(to_sign), NULL);
	if (!sha1_hash) {
		ldns_buffer_free(b64sig);
		return NULL;
	}

	sig = DSA_do_sign(sha1_hash, SHA_DIGEST_LENGTH, key);
        if(!sig) {
		ldns_buffer_free(b64sig);
		return NULL;
        }

	data = LDNS_XMALLOC(uint8_t, 1 + 2 * SHA_DIGEST_LENGTH);
        if(!data) {
		ldns_buffer_free(b64sig);
                DSA_SIG_free(sig);
		return NULL;
        }

	data[0] = 1;
	pad = 20 - (size_t) BN_num_bytes(sig->r);
	if (pad > 0) {
		memset(data + 1, 0, pad);
	}
	BN_bn2bin(sig->r, (unsigned char *) (data + 1) + pad);

	pad = 20 - (size_t) BN_num_bytes(sig->s);
	if (pad > 0) {
		memset(data + 1 + SHA_DIGEST_LENGTH, 0, pad);
	}
	BN_bn2bin(sig->s, (unsigned char *) (data + 1 + SHA_DIGEST_LENGTH + pad));

	sigdata_rdf = ldns_rdf_new_frm_data(LDNS_RDF_TYPE_B64,
								 1 + 2 * SHA_DIGEST_LENGTH,
								 data);

	ldns_buffer_free(b64sig);
	LDNS_FREE(data);
        DSA_SIG_free(sig);

	return sigdata_rdf;
}

/** check the packet and make sure that EDNS and DO and the type and RRSIG */
static int
check_packet(uint8_t* wire, size_t len, int tp)
{
	ldns_pkt *p = NULL;
	ldns_status s;
	if( (s=ldns_wire2pkt(&p, wire, len)) != LDNS_STATUS_OK) {
		if(verb) printf("error: %s\n", ldns_get_errorstr_by_id(s));
		goto failed;
	}
	if(!p) {
		if(verb) printf("error: out of memory\n");
		goto failed;
	}

	/* does DNS work? */
	if(ldns_pkt_get_rcode(p) != LDNS_RCODE_NOERROR) {
		char* r = ldns_pkt_rcode2str(ldns_pkt_get_rcode(p));
		if(verb) printf("no answer, %s\n", r?r:"(out of memory)");
		LDNS_FREE(r);
		goto failed;
	}

	/* test EDNS0 presence, of OPT record */
	/* LDNS forgets during pkt parse, but we test the ARCOUNT;
	 * 0 additionals means no EDNS(on the wire), and after parsing the
	 * same additional RRs as before means no EDNS OPT */
	if(LDNS_ARCOUNT(wire) == 0 ||
		ldns_pkt_arcount(p) == LDNS_ARCOUNT(wire)) {
		if(verb) printf("no EDNS\n");
		goto failed;
	}

	/* test if the type, RRSIG present */
	if(!check_type_in_answer(p, tp) ||
	   !check_type_in_answer(p, LDNS_RR_TYPE_RRSIG)) {
		goto failed;
	}
	
	LDNS_FREE(wire);
	ldns_pkt_free(p);
	return 1;
failed:
	LDNS_FREE(wire);
	ldns_pkt_free(p);
	return 0;
}

void
dump_hex(const ldns_pkt *pkt, const char *filename)
{
	uint8_t *wire = NULL;
	size_t size, i;
	FILE *fp;
	ldns_status status;
	
	fp = fopen(filename, "w");
	
	if (fp == NULL) {
		error("Unable to open %s for writing", filename);
		return;
	}
	
	status = ldns_pkt2wire(&wire, pkt, &size);
	
	if (status != LDNS_STATUS_OK) {
		error("Unable to convert packet: error code %u", status);
		LDNS_FREE(wire);
		fclose(fp);
		return;
	}
	
	fprintf(fp, "; 0");
	for (i = 1; i < 20; i++) {
		fprintf(fp, " %2u", (unsigned int) i);
	}
	fprintf(fp, "\n");
	fprintf(fp, ";--");
	for (i = 1; i < 20; i++) {
		fprintf(fp, " --");
	}
	fprintf(fp, "\n");
	for (i = 0; i < size; i++) {
		if (i % 20 == 0 && i > 0) {
			fprintf(fp, "\t;\t%4u-%4u\n", (unsigned int) i-19, (unsigned int) i);
		}
		fprintf(fp, " %02x", (unsigned int)wire[i]);
	}
	fprintf(fp, "\n");
	fclose(fp);
	LDNS_FREE(wire);
}