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Server ready for demo

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This commit is contained in:
Dan Hirsch 2012-05-26 19:42:07 +02:00
parent d434f2c1a9
commit 883e8dd39c
1 changed files with 20 additions and 3 deletions
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23
examples/dns.c
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@ -1,6 +1,7 @@
#include <sys/socket.h> #include <sys/socket.h>
#include <netinet/in.h> #include <netinet/in.h>
#include <err.h> #include <err.h>
#include <string.h>
#include "../src/hammer.h" #include "../src/hammer.h"
#include "dns_common.h" #include "dns_common.h"
#include "dns.h" #include "dns.h"
@ -505,8 +506,13 @@ int main(int argc, char** argv) {
} }
printf("%p\n", content); printf("%p\n", content);
// Not much time to actually implement the DNS server for the talk, so here's something quick and dirty.
// Traditional response for this time of year... // Traditional response for this time of year...
uint8_t response_buf[4096]; uint8_t response_buf[4096];
uint8_t *rp = response_buf; uint8_t *rp = response_buf;
@ -514,9 +520,9 @@ int main(int argc, char** argv) {
*rp++ = message->header.id >> 8; *rp++ = message->header.id >> 8;
*rp++ = message->header.id & 0xff; *rp++ = message->header.id & 0xff;
*rp++ = 0x80 | (message->header.opcode << 3) | message->header.rd; *rp++ = 0x80 | (message->header.opcode << 3) | message->header.rd;
*rp++ = 0x3; // change to 0 for no error... *rp++ = 0x0; // change to 0 for no error...
*rp++ = 0; *rp++ = 1; // QDCOUNT *rp++ = 0; *rp++ = 1; // QDCOUNT
*rp++ = 0; *rp++ = 0; // ANCOUNT *rp++ = 0; *rp++ = 1; // ANCOUNT
*rp++ = 0; *rp++ = 0; // NSCOUNT *rp++ = 0; *rp++ = 0; // NSCOUNT
*rp++ = 0; *rp++ = 0; // ARCOUNT *rp++ = 0; *rp++ = 0; // ARCOUNT
// encode the first question... // encode the first question...
@ -527,6 +533,17 @@ int main(int argc, char** argv) {
*rp++ = (question->qtype ) & 0xff; *rp++ = (question->qtype ) & 0xff;
*rp++ = (question->qclass >> 8) & 0xff; *rp++ = (question->qclass >> 8) & 0xff;
*rp++ = (question->qclass ) & 0xff; *rp++ = (question->qclass ) & 0xff;
// it's a cname...
format_qname(&question->qname, &rp);
*rp++ = 0; *rp++ = 5;
*rp++ = (question->qclass >> 8) & 0xff;
*rp++ = (question->qclass ) & 0xff;
*rp++ = 0; *rp++ = 0; *rp++ = 0; *rp++ = 0; // TTL.
//const char cname_rd[14] = "\x09spargelze\x02it";
*rp++ = 0; *rp++ = 14;
memcpy(rp, "\x09spargelze\x02it", 14);
rp += 14;
} }
// send response. // send response.
sendto(sock, response_buf, (rp - response_buf), 0, (struct sockaddr*)&remote, remote_len); sendto(sock, response_buf, (rp - response_buf), 0, (struct sockaddr*)&remote, remote_len);