4bd4c7caf3
In case of invalid name entry, only this entry is invalidated and parsing continues as other query entries could contain questions to be responded to
395 lines
12 KiB
C
395 lines
12 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MDNS_PRIVATE_H_
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#define MDNS_PRIVATE_H_
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#include "esp_event_base.h"
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//#define MDNS_ENABLE_DEBUG
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#ifdef MDNS_ENABLE_DEBUG
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#define _mdns_dbg_printf(...) printf(__VA_ARGS__)
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#endif
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/** The maximum number of services */
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#define MDNS_MAX_SERVICES CONFIG_MDNS_MAX_SERVICES
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#define MDNS_ANSWER_PTR_TTL 4500
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#define MDNS_ANSWER_TXT_TTL 4500
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#define MDNS_ANSWER_SRV_TTL 120
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#define MDNS_ANSWER_A_TTL 120
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#define MDNS_ANSWER_AAAA_TTL 120
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#define MDNS_FLAGS_AUTHORITATIVE 0x8400
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#define MDNS_FLAGS_DISTRIBUTED 0x0200
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#define MDNS_NAME_REF 0xC000
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//custom type! only used by this implementation
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//to help manage service discovery handling
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#define MDNS_TYPE_SDPTR 0x0032
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#define MDNS_CLASS_IN 0x0001
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#define MDNS_CLASS_ANY 0x00FF
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#define MDNS_CLASS_IN_FLUSH_CACHE 0x8001
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#define MDNS_ANSWER_ALL 0x3F
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#define MDNS_ANSWER_PTR 0x08
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#define MDNS_ANSWER_TXT 0x04
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#define MDNS_ANSWER_SRV 0x02
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#define MDNS_ANSWER_A 0x01
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#define MDNS_ANSWER_AAAA 0x10
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#define MDNS_ANSWER_NSEC 0x20
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#define MDNS_ANSWER_SDPTR 0x80
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#define MDNS_SERVICE_PORT 5353 // UDP port that the server runs on
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#define MDNS_SERVICE_STACK_DEPTH 4096 // Stack size for the service thread
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#define MDNS_PACKET_QUEUE_LEN 16 // Maximum packets that can be queued for parsing
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#define MDNS_ACTION_QUEUE_LEN 16 // Maximum actions pending to the server
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#define MDNS_TXT_MAX_LEN 1024 // Maximum string length of text data in TXT record
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#define MDNS_NAME_MAX_LEN 64 // Maximum string length of hostname, instance, service and proto
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#define MDNS_NAME_BUF_LEN (MDNS_NAME_MAX_LEN+1) // Maximum char buffer size to hold hostname, instance, service or proto
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#define MDNS_MAX_PACKET_SIZE 1460 // Maximum size of mDNS outgoing packet
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#define MDNS_HEAD_LEN 12
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#define MDNS_HEAD_ID_OFFSET 0
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#define MDNS_HEAD_FLAGS_OFFSET 2
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#define MDNS_HEAD_QUESTIONS_OFFSET 4
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#define MDNS_HEAD_ANSWERS_OFFSET 6
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#define MDNS_HEAD_SERVERS_OFFSET 8
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#define MDNS_HEAD_ADDITIONAL_OFFSET 10
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#define MDNS_TYPE_OFFSET 0
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#define MDNS_CLASS_OFFSET 2
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#define MDNS_TTL_OFFSET 4
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#define MDNS_LEN_OFFSET 8
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#define MDNS_DATA_OFFSET 10
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#define MDNS_SRV_PRIORITY_OFFSET 0
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#define MDNS_SRV_WEIGHT_OFFSET 2
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#define MDNS_SRV_PORT_OFFSET 4
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#define MDNS_SRV_FQDN_OFFSET 6
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#define MDNS_TIMER_PERIOD_US 100000
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#define MDNS_SERVICE_LOCK() xSemaphoreTake(_mdns_service_semaphore, portMAX_DELAY)
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#define MDNS_SERVICE_UNLOCK() xSemaphoreGive(_mdns_service_semaphore)
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#define queueToEnd(type, queue, item) \
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if (!queue) { \
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queue = item; \
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} else { \
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type * _q = queue; \
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while (_q->next) { _q = _q->next; } \
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_q->next = item; \
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}
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#define queueDetach(type, queue, item) \
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if (queue) { \
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if (queue == item) { \
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queue = queue->next; \
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} else { \
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type * _q = queue; \
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while (_q->next && _q->next != item) { \
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_q = _q->next; \
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} \
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if (_q->next == item) { \
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_q->next = item->next; \
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item->next = NULL; \
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} \
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} \
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}
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#define queueFree(type, queue) while (queue) { type * _q = queue; queue = queue->next; free(_q); }
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#define PCB_STATE_IS_PROBING(s) (s->state > PCB_OFF && s->state < PCB_ANNOUNCE_1)
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#define PCB_STATE_IS_ANNOUNCING(s) (s->state > PCB_PROBE_3 && s->state < PCB_RUNNING)
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#define PCB_STATE_IS_RUNNING(s) (s->state == PCB_RUNNING)
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#ifndef HOOK_MALLOC_FAILED
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#define HOOK_MALLOC_FAILED ESP_LOGE(TAG, "Cannot allocate memory (line: %d, free heap: %d bytes)", __LINE__, esp_get_free_heap_size());
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#endif
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typedef enum {
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PCB_OFF, PCB_DUP, PCB_INIT,
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PCB_PROBE_1, PCB_PROBE_2, PCB_PROBE_3,
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PCB_ANNOUNCE_1, PCB_ANNOUNCE_2, PCB_ANNOUNCE_3,
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PCB_RUNNING
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} mdns_pcb_state_t;
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typedef enum {
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MDNS_ANSWER, MDNS_NS, MDNS_EXTRA
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} mdns_parsed_recort_type_t;
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typedef enum {
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ACTION_SYSTEM_EVENT,
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ACTION_HOSTNAME_SET,
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ACTION_INSTANCE_SET,
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ACTION_SERVICE_ADD,
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ACTION_SERVICE_DEL,
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ACTION_SERVICE_INSTANCE_SET,
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ACTION_SERVICE_PORT_SET,
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ACTION_SERVICE_TXT_REPLACE,
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ACTION_SERVICE_TXT_SET,
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ACTION_SERVICE_TXT_DEL,
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ACTION_SERVICES_CLEAR,
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ACTION_SEARCH_ADD,
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ACTION_SEARCH_SEND,
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ACTION_SEARCH_END,
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ACTION_TX_HANDLE,
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ACTION_RX_HANDLE,
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ACTION_TASK_STOP,
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ACTION_MAX
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} mdns_action_type_t;
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typedef struct {
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uint16_t id;
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union {
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struct {
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uint16_t qr :1;
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uint16_t opCode :4;
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uint16_t aa :1;
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uint16_t tc :1;
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uint16_t rd :1;
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uint16_t ra :1;
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uint16_t z :1;
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uint16_t ad :1;
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uint16_t cd :1;
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uint16_t rCode :4;//response/error code
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};
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uint16_t value;
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} flags;
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uint16_t questions; //QDCOUNT
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uint16_t answers; //ANCOUNT
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uint16_t servers; //NSCOUNT
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uint16_t additional;//ARCOUNT
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} mdns_header_t;
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typedef struct {
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char host[MDNS_NAME_BUF_LEN];
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char service[MDNS_NAME_BUF_LEN];
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char proto[MDNS_NAME_BUF_LEN];
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char domain[MDNS_NAME_BUF_LEN];
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uint8_t parts;
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uint8_t sub;
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bool invalid;
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} mdns_name_t;
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typedef struct mdns_parsed_question_s {
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struct mdns_parsed_question_s * next;
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uint16_t type;
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bool unicast;
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char * host;
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char * service;
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char * proto;
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char * domain;
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} mdns_parsed_question_t;
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typedef struct mdns_parsed_record_s {
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struct mdns_parsed_record_s * next;
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mdns_parsed_recort_type_t record_type;
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uint16_t type;
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uint16_t clas;
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uint8_t flush;
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uint32_t ttl;
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char * host;
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char * service;
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char * proto;
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char * domain;
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uint16_t data_len;
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uint8_t *data;
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} mdns_parsed_record_t;
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typedef struct {
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tcpip_adapter_if_t tcpip_if;
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mdns_ip_protocol_t ip_protocol;
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//struct udp_pcb *pcb;
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ip_addr_t src;
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uint16_t src_port;
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uint8_t multicast;
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uint8_t authoritative;
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uint8_t probe;
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uint8_t discovery;
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uint8_t distributed;
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mdns_parsed_question_t * questions;
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mdns_parsed_record_t * records;
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} mdns_parsed_packet_t;
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typedef struct {
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tcpip_adapter_if_t tcpip_if;
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mdns_ip_protocol_t ip_protocol;
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struct pbuf *pb;
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ip_addr_t src;
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ip_addr_t dest;
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uint16_t src_port;
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uint8_t multicast;
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} mdns_rx_packet_t;
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typedef struct mdns_txt_linked_item_s {
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const char * key; /*!< item key name */
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const char * value; /*!< item value string */
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struct mdns_txt_linked_item_s * next; /*!< next result, or NULL for the last result in the list */
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} mdns_txt_linked_item_t;
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typedef struct {
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const char * instance;
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const char * service;
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const char * proto;
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uint16_t priority;
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uint16_t weight;
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uint16_t port;
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mdns_txt_linked_item_t * txt;
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} mdns_service_t;
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typedef struct mdns_srv_item_s {
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struct mdns_srv_item_s * next;
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mdns_service_t * service;
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} mdns_srv_item_t;
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typedef struct mdns_out_question_s {
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struct mdns_out_question_s * next;
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uint16_t type;
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bool unicast;
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const char * host;
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const char * service;
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const char * proto;
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const char * domain;
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} mdns_out_question_t;
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typedef struct mdns_out_answer_s {
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struct mdns_out_answer_s * next;
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uint16_t type;
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uint8_t bye;
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uint8_t flush;
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mdns_service_t * service;
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const char * custom_instance;
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const char * custom_service;
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const char * custom_proto;
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} mdns_out_answer_t;
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typedef struct mdns_tx_packet_s {
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struct mdns_tx_packet_s * next;
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uint32_t send_at;
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tcpip_adapter_if_t tcpip_if;
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mdns_ip_protocol_t ip_protocol;
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ip_addr_t dst;
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uint16_t port;
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uint16_t flags;
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uint8_t distributed;
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mdns_out_question_t * questions;
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mdns_out_answer_t * answers;
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mdns_out_answer_t * servers;
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mdns_out_answer_t * additional;
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bool queued;
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} mdns_tx_packet_t;
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typedef struct {
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mdns_pcb_state_t state;
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struct udp_pcb * pcb;
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mdns_srv_item_t ** probe_services;
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uint8_t probe_services_len;
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uint8_t probe_ip;
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uint8_t probe_running;
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uint16_t failed_probes;
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} mdns_pcb_t;
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typedef enum {
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SEARCH_OFF,
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SEARCH_INIT,
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SEARCH_RUNNING,
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SEARCH_MAX
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} mdns_search_once_state_t;
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typedef struct mdns_search_once_s {
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struct mdns_search_once_s * next;
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mdns_search_once_state_t state;
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uint32_t started_at;
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uint32_t sent_at;
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uint32_t timeout;
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SemaphoreHandle_t done_semaphore;
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uint16_t type;
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uint8_t max_results;
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uint8_t num_results;
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char * instance;
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char * service;
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char * proto;
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mdns_result_t * result;
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} mdns_search_once_t;
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typedef struct mdns_server_s {
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struct {
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mdns_pcb_t pcbs[MDNS_IP_PROTOCOL_MAX];
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} interfaces[TCPIP_ADAPTER_IF_MAX];
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const char * hostname;
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const char * instance;
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mdns_srv_item_t * services;
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SemaphoreHandle_t lock;
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QueueHandle_t action_queue;
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mdns_tx_packet_t * tx_queue_head;
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mdns_search_once_t * search_once;
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esp_timer_handle_t timer_handle;
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} mdns_server_t;
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typedef struct {
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mdns_action_type_t type;
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union {
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char * hostname;
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char * instance;
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struct {
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esp_event_base_t event_base;
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int32_t event_id;
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tcpip_adapter_if_t interface;
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} sys_event;
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struct {
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mdns_srv_item_t * service;
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} srv_add;
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struct {
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mdns_srv_item_t * service;
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} srv_del;
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struct {
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mdns_srv_item_t * service;
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char * instance;
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} srv_instance;
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struct {
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mdns_srv_item_t * service;
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uint16_t port;
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} srv_port;
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struct {
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mdns_srv_item_t * service;
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mdns_txt_linked_item_t * txt;
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} srv_txt_replace;
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struct {
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mdns_srv_item_t * service;
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char * key;
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char * value;
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} srv_txt_set;
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struct {
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mdns_srv_item_t * service;
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char * key;
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} srv_txt_del;
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struct {
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mdns_search_once_t * search;
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} search_add;
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struct {
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mdns_tx_packet_t * packet;
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} tx_handle;
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struct {
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mdns_rx_packet_t * packet;
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} rx_handle;
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} data;
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} mdns_action_t;
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#endif /* MDNS_PRIVATE_H_ */
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