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