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65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
// Copyright (c) 2022 Cesanta Software Limited
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// All rights reserved
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#include "mongoose.h"
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static const char *s_ssdp_url = "udp://239.255.255.250:1900";
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static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
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MG_DEBUG(("%p got event: %d %p %p", c, ev, ev_data, fn_data));
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if (ev == MG_EV_OPEN) {
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// c->is_hexdumping = 1;
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} else if (ev == MG_EV_RESOLVE) {
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// c->rem gets populated with multicast address. Store it in c->label
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memcpy(c->label, &c->rem, sizeof(c->rem));
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} else if (ev == MG_EV_READ) {
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MG_INFO(("Got a response"));
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struct mg_http_message hm;
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if (mg_http_parse((const char *) c->recv.buf, c->recv.len, &hm) > 0) {
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size_t i, max = sizeof(hm.headers) / sizeof(hm.headers[0]);
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// Iterate over request headers
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for (i = 0; i < max && hm.headers[i].name.len > 0; i++) {
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struct mg_str *k = &hm.headers[i].name, *v = &hm.headers[i].value;
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if ((mg_vcasecmp(k, "SERVER") == 0) ||
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(mg_vcasecmp(k, "LOCATION") == 0)) {
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printf("\t%.*s -> %.*s\n", (int) k->len, k->ptr, (int) v->len,
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v->ptr);
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}
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}
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printf("\n");
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}
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// Each response to the SSDP socket will change c->rem.
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// We can now do mg_printf(c, "haha"); to respond back to the remote side.
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// But in our case, we should restore the multicast address in order
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// to have next search to go to the multicast address
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memcpy(&c->rem, c->label, sizeof(c->rem));
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// Discard the content of this response as we expect each SSDP response
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// to generate at most one MG_EV_READ event.
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c->recv.len = 0UL;
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}
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}
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static void tfn(void *param) {
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struct mg_connection *c = param;
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if (c == NULL) return;
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MG_INFO(("Sending M-SEARCH"));
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mg_printf(c, "%s",
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"M-SEARCH * HTTP/1.1\r\n"
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"HOST: 239.255.255.250:1900\r\n"
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"MAN: \"ssdp:discover\"\r\n"
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"ST: urn:schemas-upnp-org:device:MediaRenderer:1\r\n"
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"MX: 5\r\n"
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"\r\n");
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}
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int main(void) {
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struct mg_mgr mgr;
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static struct mg_connection *c;
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mg_mgr_init(&mgr);
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c = mg_connect(&mgr, s_ssdp_url, fn, NULL);
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mg_timer_add(&mgr, 2000, MG_TIMER_REPEAT | MG_TIMER_RUN_NOW, tfn, c);
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while (true) mg_mgr_poll(&mgr, 200);
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mg_mgr_free(&mgr);
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return 0;
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}
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