mirror of
https://github.com/espressif/esp-idf.git
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eab4e6fedd
Defined in https://tools.ietf.org/html/rfc6762#section-11: All Multicast DNS responses (including responses sent via unicast) SHOULD be sent with IP TTL set to 255
348 lines
9.7 KiB
C
348 lines
9.7 KiB
C
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/*
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* MDNS Server Networking
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*
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*/
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#include <string.h>
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#include "mdns_networking.h"
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#include "esp_log.h"
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#include "esp_netif_net_stack.h"
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extern mdns_server_t * _mdns_server;
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/*
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* MDNS Server Networking
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*
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*/
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static const char *TAG = "MDNS_Networking";
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static struct udp_pcb * _pcb_main = NULL;
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static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport);
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/**
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* @brief Low level UDP PCB Initialize
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*/
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static esp_err_t _udp_pcb_main_init(void)
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{
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if(_pcb_main) {
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return ESP_OK;
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}
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_pcb_main = udp_new();
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if (!_pcb_main) {
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return ESP_ERR_NO_MEM;
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}
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if (udp_bind(_pcb_main, IP_ANY_TYPE, MDNS_SERVICE_PORT) != 0) {
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udp_remove(_pcb_main);
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_pcb_main = NULL;
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return ESP_ERR_INVALID_STATE;
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}
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_pcb_main->mcast_ttl = 255;
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_pcb_main->remote_port = MDNS_SERVICE_PORT;
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ip_addr_copy(_pcb_main->remote_ip, *(IP_ANY_TYPE));
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udp_recv(_pcb_main, &_udp_recv, _mdns_server);
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return ESP_OK;
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}
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/**
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* @brief Low level UDP PCB Free
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*/
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static void _udp_pcb_main_deinit(void)
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{
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if(_pcb_main){
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udp_recv(_pcb_main, NULL, NULL);
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udp_disconnect(_pcb_main);
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udp_remove(_pcb_main);
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_pcb_main = NULL;
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}
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}
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/**
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* @brief Low level UDP Multicast membership control
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*/
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static esp_err_t _udp_join_group(mdns_if_t if_inx, mdns_ip_protocol_t ip_protocol, bool join)
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{
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struct netif * netif = NULL;
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esp_netif_t *tcpip_if = _mdns_get_esp_netif(if_inx);
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if (!esp_netif_is_netif_up(tcpip_if)) {
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// Network interface went down before event propagated, skipping IGMP config
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return ESP_ERR_INVALID_STATE;
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}
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netif = esp_netif_get_netif_impl(tcpip_if);
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assert(netif);
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if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
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ip4_addr_t multicast_addr;
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IP4_ADDR(&multicast_addr, 224, 0, 0, 251);
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if(join){
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if (igmp_joingroup_netif(netif, &multicast_addr)) {
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return ESP_ERR_INVALID_STATE;
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}
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} else {
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if (igmp_leavegroup_netif(netif, &multicast_addr)) {
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return ESP_ERR_INVALID_STATE;
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}
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}
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}
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#if CONFIG_LWIP_IPV6
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else {
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ip_addr_t multicast_addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
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if(join){
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if (mld6_joingroup_netif(netif, &(multicast_addr.u_addr.ip6))) {
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return ESP_ERR_INVALID_STATE;
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}
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} else {
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if (mld6_leavegroup_netif(netif, &(multicast_addr.u_addr.ip6))) {
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return ESP_ERR_INVALID_STATE;
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}
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}
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}
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#endif
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return ESP_OK;
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}
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/**
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* @brief the receive callback of the raw udp api. Packets are received here
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*
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*/
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static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport)
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{
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uint8_t i;
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while (pb != NULL) {
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struct pbuf * this_pb = pb;
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pb = pb->next;
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this_pb->next = NULL;
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mdns_rx_packet_t * packet = (mdns_rx_packet_t *)malloc(sizeof(mdns_rx_packet_t));
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if (!packet) {
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HOOK_MALLOC_FAILED;
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//missed packet - no memory
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pbuf_free(this_pb);
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continue;
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}
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packet->tcpip_if = MDNS_IF_MAX;
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packet->pb = this_pb;
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packet->src_port = rport;
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#if CONFIG_LWIP_IPV6
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packet->src.type = raddr->type;
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memcpy(&packet->src.u_addr, &raddr->u_addr, sizeof(raddr->u_addr));
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#else
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packet->src.type = IPADDR_TYPE_V4;
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memcpy(&packet->src.u_addr.ip4, &raddr->addr, sizeof(ip_addr_t));
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#endif
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packet->dest.type = packet->src.type;
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if (packet->src.type == IPADDR_TYPE_V4) {
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packet->ip_protocol = MDNS_IP_PROTOCOL_V4;
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struct ip_hdr * iphdr = (struct ip_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP_HLEN);
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packet->dest.u_addr.ip4.addr = iphdr->dest.addr;
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packet->multicast = ip4_addr_ismulticast(&(packet->dest.u_addr.ip4));
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}
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#if CONFIG_LWIP_IPV6
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else {
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packet->ip_protocol = MDNS_IP_PROTOCOL_V6;
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struct ip6_hdr * ip6hdr = (struct ip6_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP6_HLEN);
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memcpy(&packet->dest.u_addr.ip6.addr, (uint8_t *)ip6hdr->dest.addr, 16);
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packet->multicast = ip6_addr_ismulticast(&(packet->dest.u_addr.ip6));
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}
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#endif
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//lwip does not return the proper pcb if you have more than one for the same multicast address (but different interfaces)
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struct netif * netif = NULL;
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struct udp_pcb * pcb = NULL;
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for (i=0; i<MDNS_IF_MAX; i++) {
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pcb = _mdns_server->interfaces[i].pcbs[packet->ip_protocol].pcb;
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netif = esp_netif_get_netif_impl(_mdns_get_esp_netif(i));
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if (pcb && netif && netif == ip_current_input_netif ()) {
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if (packet->src.type == IPADDR_TYPE_V4) {
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#if CONFIG_LWIP_IPV6
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if ((packet->src.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr) != (netif->ip_addr.u_addr.ip4.addr & netif->netmask.u_addr.ip4.addr)) {
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#else
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if ((packet->src.u_addr.ip4.addr & netif->netmask.addr) != (netif->ip_addr.addr & netif->netmask.addr)) {
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#endif //packet source is not in the same subnet
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pcb = NULL;
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break;
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}
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}
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packet->tcpip_if = i;
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break;
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}
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pcb = NULL;
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}
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if (!pcb || !_mdns_server || !_mdns_server->action_queue
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|| _mdns_send_rx_action(packet) != ESP_OK) {
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pbuf_free(this_pb);
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free(packet);
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}
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}
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}
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/**
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* @brief Check if any of the interfaces is up
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*/
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static bool _udp_pcb_is_in_use(void){
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int i, p;
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for (i=0; i<MDNS_IF_MAX; i++) {
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for (p=0; p<MDNS_IP_PROTOCOL_MAX; p++) {
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if(_mdns_server->interfaces[i].pcbs[p].pcb){
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return true;
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}
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}
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}
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return false;
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}
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/**
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* @brief Stop PCB Main code
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*/
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static void _udp_pcb_deinit(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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if (!_mdns_server) {
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return;
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}
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mdns_pcb_t * _pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
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if (_pcb->pcb) {
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free(_pcb->probe_services);
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_pcb->state = PCB_OFF;
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_pcb->pcb = NULL;
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_pcb->probe_ip = false;
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_pcb->probe_services = NULL;
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_pcb->probe_services_len = 0;
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_pcb->probe_running = false;
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_pcb->failed_probes = 0;
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_udp_join_group(tcpip_if, ip_protocol, false);
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if(!_udp_pcb_is_in_use()) {
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_udp_pcb_main_deinit();
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}
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}
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}
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/**
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* @brief Start PCB Main code
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*/
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static esp_err_t _udp_pcb_init(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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if (!_mdns_server || _mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb) {
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return ESP_ERR_INVALID_STATE;
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}
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esp_err_t err = _udp_join_group(tcpip_if, ip_protocol, true);
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if(err){
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return err;
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}
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err = _udp_pcb_main_init();
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if(err){
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return err;
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}
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_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb = _pcb_main;
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_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].failed_probes = 0;
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return ESP_OK;
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}
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typedef struct {
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struct tcpip_api_call_data call;
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mdns_if_t tcpip_if;
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mdns_ip_protocol_t ip_protocol;
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struct pbuf *pbt;
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const ip_addr_t *ip;
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uint16_t port;
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esp_err_t err;
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} mdns_api_call_t;
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/**
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* @brief Start PCB from LwIP thread
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*/
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static err_t _mdns_pcb_init_api(struct tcpip_api_call_data *api_call_msg)
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{
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mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
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msg->err = _udp_pcb_init(msg->tcpip_if, msg->ip_protocol);
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return msg->err;
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}
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/**
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* @brief Stop PCB from LwIP thread
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*/
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static err_t _mdns_pcb_deinit_api(struct tcpip_api_call_data *api_call_msg)
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{
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mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
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_udp_pcb_deinit(msg->tcpip_if, msg->ip_protocol);
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msg->err = ESP_OK;
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return ESP_OK;
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}
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/*
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* Non-static functions below are
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* - _mdns prefixed
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* - commented in mdns_networking.h header
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*/
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esp_err_t _mdns_pcb_init(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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mdns_api_call_t msg = {
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.tcpip_if = tcpip_if,
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.ip_protocol = ip_protocol
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};
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tcpip_api_call(_mdns_pcb_init_api, &msg.call);
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return msg.err;
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}
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esp_err_t _mdns_pcb_deinit(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
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{
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mdns_api_call_t msg = {
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.tcpip_if = tcpip_if,
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.ip_protocol = ip_protocol
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};
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tcpip_api_call(_mdns_pcb_deinit_api, &msg.call);
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return msg.err;
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}
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static err_t _mdns_udp_pcb_write_api(struct tcpip_api_call_data *api_call_msg)
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{
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void * nif = NULL;
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mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
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mdns_pcb_t * _pcb = &_mdns_server->interfaces[msg->tcpip_if].pcbs[msg->ip_protocol];
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nif = esp_netif_get_netif_impl(_mdns_get_esp_netif(msg->tcpip_if));
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if (!nif) {
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pbuf_free(msg->pbt);
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msg->err = ERR_IF;
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return ERR_IF;
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}
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esp_err_t err = udp_sendto_if (_pcb->pcb, msg->pbt, msg->ip, msg->port, (struct netif *)nif);
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pbuf_free(msg->pbt);
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msg->err = err;
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return err;
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}
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size_t _mdns_udp_pcb_write(mdns_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, const esp_ip_addr_t *ip, uint16_t port, uint8_t * data, size_t len)
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{
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struct pbuf* pbt = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
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if (pbt == NULL) {
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return 0;
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}
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memcpy((uint8_t *)pbt->payload, data, len);
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mdns_api_call_t msg = {
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.tcpip_if = tcpip_if,
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.ip_protocol = ip_protocol,
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.pbt = pbt,
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.ip = (ip_addr_t *)ip,
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.port = port
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};
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tcpip_api_call(_mdns_udp_pcb_write_api, &msg.call);
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if (msg.err) {
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return 0;
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}
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return len;
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}
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