mirror of
https://github.com/cesanta/mongoose.git
synced 2024-12-05 10:58:59 +08:00
083d398631
In particular, there may be additional records which should not be copied PUBLISHED_FROM=6b348868cb62d7b3fc4df0e935ffd5a31a314a08
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/*
|
|
* 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);
|
|
LOG(LL_INFO, ("Q type %d name %s", 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");
|
|
cs_log_set_level(LL_INFO);
|
|
|
|
/* 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;
|
|
}
|