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32
dnsd.c
32
dnsd.c
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@ -39,6 +39,7 @@ char topdomain[256];
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int packetlen;
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char activepacket[4096];
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int outid;
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int outbuflen;
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char outbuf[64*1024];
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@ -174,10 +175,11 @@ dnsd_queuepacket(const char *buf, const int buflen)
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memcpy(outbuf, buf, buflen);
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outbuflen = buflen;
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outid++;
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}
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static void
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dnsd_respond(int fd, short id, struct sockaddr_in from)
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dnsd_respond(int fd, char *name, short type, short id, struct sockaddr_in from)
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{
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int len;
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char *p;
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@ -189,7 +191,7 @@ dnsd_respond(int fd, short id, struct sockaddr_in from)
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len = 0;
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header = (HEADER*)buf;
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header->id = id;
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header->id = htons(id);
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header->qr = 1;
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header->opcode = 0;
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header->aa = 1;
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@ -197,22 +199,28 @@ dnsd_respond(int fd, short id, struct sockaddr_in from)
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header->rd = 0;
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header->ra = 0;
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if(outbuflen > 0)
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header->qdcount = htons(1);
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header->ancount = htons(1);
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else
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header->ancount = htons(0);
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p = buf + sizeof(HEADER);
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p += host2dns("fluff", p, 5);
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PUTSHORT(T_NULL, p);
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p += host2dns(name, p, strlen(name));
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PUTSHORT(type, p);
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PUTSHORT(C_IN, p);
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PUTLONG(htons(0), p);
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//size = host2dns(outbuf, p+2, outbuflen);
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p += host2dns(name, p, strlen(name));
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PUTSHORT(type, p);
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PUTSHORT(C_IN, p);
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PUTLONG(0, p);
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if(outbuflen > 0) {
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printf("%d\n", outid);
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PUTSHORT(outbuflen, p);
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memcpy(p, outbuf, outbuflen);
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p += outbuflen;
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} else {
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PUTSHORT(0, p);
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}
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len = p - buf;
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printf("Responding with %d\n", len);
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@ -224,7 +232,6 @@ dnsd_respond(int fd, short id, struct sockaddr_in from)
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int
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dnsd_read(int fd, char *buf, int buflen)
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{
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int i;
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int r;
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short id;
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short type;
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@ -261,12 +268,14 @@ dnsd_read(int fd, char *buf, int buflen)
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if(!header->qr) {
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qdcount = ntohs(header->qdcount);
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for(i=0;i<qdcount;i++) {
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if(qdcount == 1) {
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bzero(name, sizeof(name));
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READNAME(packet, name, data);
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READSHORT(type, data);
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READSHORT(class, data);
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dnsd_respond(fd, name, type, id, from);
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lastblock = name[0] - '0';
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np = name;
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np++; // skip first byte, it has only fragmentation info
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@ -289,7 +298,6 @@ dnsd_read(int fd, char *buf, int buflen)
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packetp++;
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packetlen++;
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}
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dnsd_respond(fd, id, from);
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if (lastblock && packetlen < 2) {
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// Skipping ping packet
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packetlen = 0;
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@ -57,10 +57,8 @@ tunnel(int tun_fd, int dns_fd)
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tv.tv_usec = 0;
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FD_ZERO(&fds);
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if(!dnsd_haspacket()) {
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printf("There is room for more\n");
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if(!dnsd_haspacket())
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FD_SET(tun_fd, &fds);
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}
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FD_SET(dns_fd, &fds);
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i = select(MAX(tun_fd, dns_fd) + 1, &fds, NULL, NULL, &tv);
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@ -77,7 +75,6 @@ tunnel(int tun_fd, int dns_fd)
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printf("data on tun\n");
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read = read_tun(tun_fd, frame, 64*1024);
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if(read > 0) {
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printf("Sending response\n");
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dnsd_queuepacket(frame->data, read - 4);
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}
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}
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