Revert "Stop publish examples to mongoose repo"

This reverts commit 1a17e17c462bdd4e1d26d8742f8b7087273e04c2.

PUBLISHED_FROM=80028de308c9a021955d1425d2bfee8feb85f193

examples/captive_dns_server/Makefile

@@ -0,0 +1,4 @@
+PROG = captive_dns_server
+MODULE_CFLAGS=-DMG_ENABLE_DNS_SERVER -DMG_ENABLE_IPV6
+SSL_LIB=openssl
+include ../examples.mk

examples/captive_dns_server/captive_dns_server.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2014 Cesanta Software Limited
+ * All rights reserved
+ */
+
+/*
+ * Try it out with:
+ * $ dig -t A www.google.com -4 @localhost -p 5533
+ */
+
+#include "../../mongoose.h"
+
+#include <stdio.h>
+
+static int s_exit_flag = 0;
+static in_addr_t s_our_ip_addr;
+static const char *s_listening_addr = "udp://:5533";
+
+static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
+  struct mg_dns_message *msg;
+  struct mg_dns_resource_record *rr;
+  struct mg_dns_reply reply;
+  int i;
+
+  switch (ev) {
+    case MG_DNS_MESSAGE: {
+      struct mbuf reply_buf;
+      mbuf_init(&reply_buf, 512);
+      msg = (struct mg_dns_message *) ev_data;
+      reply = mg_dns_create_reply(&reply_buf, msg);
+
+      for (i = 0; i < msg->num_questions; i++) {
+        char rname[256];
+        rr = &msg->questions[i];
+        mg_dns_uncompress_name(msg, &rr->name, rname, sizeof(rname) - 1);
+        fprintf(stdout, "Q type %d name %s\n", rr->rtype, rname);
+        if (rr->rtype == MG_DNS_A_RECORD) {
+          mg_dns_reply_record(&reply, rr, NULL, rr->rtype, 10, &s_our_ip_addr,
+                              4);
+        }
+      }
+
+      /*
+       * We don't set the error flag even if there were no answers
+       * matching the MG_DNS_A_RECORD query type.
+       * This indicates that we have (synthetic) answers for MG_DNS_A_RECORD.
+       * See http://goo.gl/QWvufr for a distinction between NXDOMAIN and NODATA.
+       */
+
+      mg_dns_send_reply(nc, &reply);
+      nc->flags |= MG_F_SEND_AND_CLOSE;
+      mbuf_free(&reply_buf);
+      break;
+    }
+  }
+}
+
+int main(int argc, char *argv[]) {
+  struct mg_mgr mgr;
+  struct mg_connection *nc;
+  int i;
+
+  mg_mgr_init(&mgr, NULL);
+  s_our_ip_addr = inet_addr("127.0.0.1");
+
+  /* Parse command line arguments */
+  for (i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "-D") == 0) {
+      mgr.hexdump_file = argv[++i];
+    } else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) {
+      s_listening_addr = argv[++i];
+    } else {
+      s_our_ip_addr = inet_addr(argv[i]);
+    }
+  }
+
+  fprintf(stderr, "Listening on '%s'\n", s_listening_addr);
+  if ((nc = mg_bind(&mgr, s_listening_addr, ev_handler)) == NULL) {
+    fprintf(stderr, "cannot bind to socket\n");
+    exit(1);
+  }
+  mg_set_protocol_dns(nc);
+
+  while (s_exit_flag == 0) {
+    mg_mgr_poll(&mgr, 1000);
+  }
+  mg_mgr_free(&mgr);
+
+  return 0;
+}