OVMS3-idf/components/mdns/mdns_networking.c

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/*
* MDNS Server Networking
*
*/
#include <string.h>
#include "mdns_networking.h"
extern mdns_server_t * _mdns_server;
/*
* MDNS Server Networking
*
*/
/**
* @brief the receive callback of the raw udp api. Packets are received here
*
*/
static void _udp_recv(void *arg, struct udp_pcb *upcb, struct pbuf *pb, const ip_addr_t *raddr, uint16_t rport)
{
uint8_t i;
while (pb != NULL) {
struct pbuf * this_pb = pb;
pb = pb->next;
this_pb->next = NULL;
mdns_rx_packet_t * packet = (mdns_rx_packet_t *)malloc(sizeof(mdns_rx_packet_t));
if (!packet) {
//missed packet - no memory
pbuf_free(this_pb);
continue;
}
packet->tcpip_if = TCPIP_ADAPTER_IF_MAX;
packet->pb = this_pb;
packet->src_port = rport;
memcpy(&packet->src, raddr, sizeof(ip_addr_t));
packet->dest.type = packet->src.type;
if (packet->src.type == IPADDR_TYPE_V4) {
packet->ip_protocol = MDNS_IP_PROTOCOL_V4;
struct ip_hdr * iphdr = (struct ip_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP_HLEN);
packet->dest.u_addr.ip4.addr = iphdr->dest.addr;
} else {
packet->ip_protocol = MDNS_IP_PROTOCOL_V6;
struct ip6_hdr * ip6hdr = (struct ip6_hdr *)(((uint8_t *)(packet->pb->payload)) - UDP_HLEN - IP6_HLEN);
memcpy(&packet->dest.u_addr.ip6.addr, (uint8_t *)ip6hdr->dest.addr, 16);
}
packet->multicast = ip_addr_ismulticast(&(packet->dest));
//lwip does not return the proper pcb if you have more than one for the same multicast address (but different interfaces)
struct netif * netif = NULL;
void * nif = NULL;
struct udp_pcb * pcb = NULL;
for (i=0; i<TCPIP_ADAPTER_IF_MAX; i++) {
pcb = _mdns_server->interfaces[i].pcbs[packet->ip_protocol].pcb;
tcpip_adapter_get_netif (i, &nif);
netif = (struct netif *)nif;
if (pcb && netif && netif == ip_current_input_netif ()) {
if (packet->src.type == IPADDR_TYPE_V4) {
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)) {
//packet source is not in the same subnet
pcb = NULL;
break;
}
}
packet->tcpip_if = i;
break;
}
pcb = NULL;
}
if (!pcb || !_mdns_server || !_mdns_server->action_queue
|| _mdns_send_rx_action(packet) != ESP_OK) {
pbuf_free(this_pb);
free(packet);
}
}
}
/**
* @brief Stop PCB Main code
*/
static void _udp_pcb_deinit(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
if (!_mdns_server) {
return;
}
mdns_pcb_t * _pcb = &_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol];
if (_pcb->pcb) {
_pcb->state = PCB_OFF;
udp_recv(_pcb->pcb, NULL, NULL);
udp_disconnect(_pcb->pcb);
udp_remove(_pcb->pcb);
free(_pcb->probe_services);
_pcb->pcb = NULL;
_pcb->probe_ip = false;
_pcb->probe_services = NULL;
_pcb->probe_services_len = 0;
_pcb->probe_running = false;
_pcb->failed_probes = 0;
}
}
/**
* @brief Start PCB V4
*/
static esp_err_t _udp_pcb_v4_init(tcpip_adapter_if_t tcpip_if)
{
tcpip_adapter_ip_info_t if_ip_info;
if (!_mdns_server || _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb) {
return ESP_ERR_INVALID_STATE;
}
if (tcpip_adapter_get_ip_info(tcpip_if, &if_ip_info) || if_ip_info.ip.addr == 0) {
return ESP_ERR_INVALID_ARG;
}
ip_addr_t interface_addr = IPADDR4_INIT(if_ip_info.ip.addr);
ip_addr_t multicast_addr;
IP_ADDR4(&multicast_addr, 224, 0, 0, 251);
if (igmp_joingroup((const struct ip4_addr *)&interface_addr.u_addr.ip4, (const struct ip4_addr *)&multicast_addr.u_addr.ip4)) {
return ESP_ERR_INVALID_STATE;
}
struct udp_pcb * pcb = udp_new_ip_type(IPADDR_TYPE_V4);
if (!pcb) {
return ESP_ERR_NO_MEM;
}
if (udp_bind(pcb, &interface_addr, MDNS_SERVICE_PORT) != 0) {
udp_remove(pcb);
return ESP_ERR_INVALID_STATE;
}
pcb->mcast_ttl = 1;
pcb->remote_port = MDNS_SERVICE_PORT;
ip_addr_copy(pcb->multicast_ip, interface_addr);
ip_addr_copy(pcb->remote_ip, multicast_addr);
_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].pcb = pcb;
_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V4].failed_probes = 0;
udp_recv(pcb, &_udp_recv, _mdns_server);
return ESP_OK;
}
/**
* @brief Start PCB V6
*/
static esp_err_t _udp_pcb_v6_init(tcpip_adapter_if_t tcpip_if)
{
ip_addr_t multicast_addr = IPADDR6_INIT(0x000002ff, 0, 0, 0xfb000000);
ip_addr_t interface_addr;
interface_addr.type = IPADDR_TYPE_V6;
if (!_mdns_server || _mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb) {
return ESP_ERR_INVALID_STATE;
}
if (tcpip_adapter_get_ip6_linklocal(tcpip_if, &interface_addr.u_addr.ip6)) {
return ESP_ERR_INVALID_ARG;
}
if (mld6_joingroup(&(interface_addr.u_addr.ip6), &(multicast_addr.u_addr.ip6))) {
return ESP_ERR_INVALID_STATE;
}
struct udp_pcb * pcb = udp_new_ip_type(IPADDR_TYPE_V6);
if (!pcb) {
return ESP_ERR_NO_MEM;
}
if (udp_bind(pcb, &interface_addr, MDNS_SERVICE_PORT) != 0) {
udp_remove(pcb);
return ESP_ERR_INVALID_STATE;
}
pcb->remote_port = MDNS_SERVICE_PORT;
ip_addr_copy(pcb->remote_ip, multicast_addr);
_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].pcb = pcb;
_mdns_server->interfaces[tcpip_if].pcbs[MDNS_IP_PROTOCOL_V6].failed_probes = 0;
udp_recv(pcb, &_udp_recv, _mdns_server);
return ESP_OK;
}
/**
* @brief Start PCB Main code
*/
static esp_err_t _udp_pcb_init(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
if (ip_protocol == MDNS_IP_PROTOCOL_V4) {
return _udp_pcb_v4_init(tcpip_if);
} else if (ip_protocol == MDNS_IP_PROTOCOL_V6) {
return _udp_pcb_v6_init(tcpip_if);
}
return ESP_ERR_INVALID_ARG;
}
typedef struct {
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struct tcpip_api_call_data call;
tcpip_adapter_if_t tcpip_if;
mdns_ip_protocol_t ip_protocol;
esp_err_t err;
} mdns_api_call_t;
/**
* @brief Start PCB from LwIP thread
*/
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static err_t _mdns_pcb_init_api(struct tcpip_api_call_data *api_call_msg)
{
mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
msg->err = _udp_pcb_init(msg->tcpip_if, msg->ip_protocol);
return msg->err;
}
/**
* @brief Stop PCB from LwIP thread
*/
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static err_t _mdns_pcb_deinit_api(struct tcpip_api_call_data *api_call_msg)
{
mdns_api_call_t * msg = (mdns_api_call_t *)api_call_msg;
_udp_pcb_deinit(msg->tcpip_if, msg->ip_protocol);
msg->err = ESP_OK;
return ESP_OK;
}
/*
* Non-static functions below are
* - _mdns prefixed
* - commented in mdns_networking.h header
*/
esp_err_t _mdns_pcb_init(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_api_call_t msg = {
.tcpip_if = tcpip_if,
.ip_protocol = ip_protocol
};
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tcpip_api_call(_mdns_pcb_init_api, (struct tcpip_api_call_data*)&msg);
return msg.err;
}
esp_err_t _mdns_pcb_deinit(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol)
{
mdns_api_call_t msg = {
.tcpip_if = tcpip_if,
.ip_protocol = ip_protocol
};
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tcpip_api_call(_mdns_pcb_deinit_api, (struct tcpip_api_call_data*)&msg);
return msg.err;
}
size_t _mdns_udp_pcb_write(tcpip_adapter_if_t tcpip_if, mdns_ip_protocol_t ip_protocol, const ip_addr_t *ip, uint16_t port, uint8_t * data, size_t len)
{
struct netif * netif = NULL;
void * nif = NULL;
esp_err_t err = tcpip_adapter_get_netif(tcpip_if, &nif);
netif = (struct netif *)nif;
if (err) {
return 0;
}
struct pbuf* pbt = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
if (pbt == NULL) {
return 0;
}
memcpy((uint8_t *)pbt->payload, data, len);
err = udp_sendto_if (_mdns_server->interfaces[tcpip_if].pcbs[ip_protocol].pcb, pbt, ip, port, netif);
pbuf_free(pbt);
if (err) {
return 0;
}
return len;
}