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Make ARP probe public. Add ARP event

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This commit is contained in:
Sergey Lyubka
2024-10-09 11:33:14 -03:00
committed by Sergio R. Caprile
parent 244536ea72
commit e1f7f3d7bb
5 changed files with 54 additions and 9 deletions
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tutorials/tcpip/pcap-driver/main.c
+36 -3
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@@ -6,9 +6,9 @@
#include <pcap.h>
#include "mongoose.h"
#define MQTT_URL "mqtt://broker.emqx.io:1883" // MQTT broker URL
#define MQTTS_URL "mqtts://mongoose.ws:8883" // HiveMQ does not TLS1.3
#define MQTT_TOPIC "mg/rx" // Topic to subscribe to
#define MQTT_URL "mqtt://broker.emqx.io:1883" // MQTT broker URL
#define MQTTS_URL "mqtts://mongoose.ws:8883" // HiveMQ does not TLS1.3
#define MQTT_TOPIC "mg/rx" // Topic to subscribe to
// // Taken from broker.emqx.io
static const char *s_ca_cert =
@@ -192,6 +192,35 @@ static void mqtt_ev_handler(struct mg_connection *c, int ev, void *ev_data) {
}
}
static void if_ev_handler(struct mg_tcpip_if *ifp, int ev, void *ev_data) {
static uint32_t ip = 0;
static unsigned counter = 0;
// Set initial self-assigned IP
if (ip == 0) ip = MG_IPV4(169, 254, 2, 100);
// Catch ARP packets. Parse them yourself, that's easy.
if (ev == MG_TCPIP_EV_ARP) {
struct mg_str *frame = ev_data;
MG_INFO(("Iface %p: Got ARP frame", ifp));
mg_hexdump(frame->buf, frame->len);
// TODO: check for conflict. On conflict, increment ip and reset counter
}
// Catch 1 second timer events
if (ev == MG_TCPIP_EV_TIMER_1S && ifp->ip == 0) {
MG_INFO(("Sending ARP probe"));
mg_tcpip_arp_request(ifp, ip, NULL);
// Seems to be no conflict. Assign us an IP
if (counter++ > 2) {
MG_INFO(("Assigning %M, sending ARP probe", mg_print_ip4, &ip));
ifp->ip = ip;
mg_tcpip_arp_request(ifp, ip, ifp->mac);
}
}
}
int main(int argc, char *argv[]) {
const char *iface = "lo0"; // Network iface
const char *mac = "02:00:01:02:03:77"; // MAC address
@@ -252,6 +281,10 @@ int main(int argc, char *argv[]) {
&mif.mac[2], &mif.mac[3], &mif.mac[4], &mif.mac[5]);
mg_tcpip_init(&mgr, &mif);
// Call order is important: call after mg_tcpip_init()
mif.fn = if_ev_handler;
mif.enable_dhcp_client = false;
MG_INFO(("Init done, starting main loop"));
mg_http_listen(&mgr, "http://0.0.0.0:8000", http_ev_handler, NULL);
mg_http_listen(&mgr, "https://0.0.0.0:8443", http_ev_handler, "tls enabled");