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We can send data
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parent
ecb97656ab
commit
f9381aa723
52
dns.c
52
dns.c
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@ -140,11 +140,13 @@ close_dns(int fd)
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void
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dns_ping(int dns_fd)
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{
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dns_query(dns_fd, "4.kryo.se", 1);
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dns_write(dns_fd, dns_fd,
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"AAAAAAAAAAAKRYOAAAAAAAAAAAKRYOAAAAAAAAAAAAAKRYOAAAAAAAAAAAAAKRYOAAAAAAAAAAAAAAAKRYOAAAAAAAAAAAAAKRYOAAAAAAAAAAAAAAAAAAB",
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119);
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}
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void
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dns_query(int fd, char *host, int type)
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dns_query(int fd, int id, char *host, int type)
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{
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char *p;
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int len;
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@ -157,7 +159,7 @@ dns_query(int fd, char *host, int type)
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header = (HEADER*)buf;
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header->id = 0;
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header->id = id;
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header->qr = 0;
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header->opcode = 0;
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header->aa = 0;
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@ -179,6 +181,50 @@ dns_query(int fd, char *host, int type)
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sendto(fd, buf, len+1, 0, (struct sockaddr*)&peer, peerlen);
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}
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int
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dns_write(int fd, int id, char *buf, int len)
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{
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int avail;
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int i;
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int parts;
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int p;
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char data[256];
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char *d;
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#define CHUNK 31
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// 31 bytes expands to 62 chars in domain
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// We just use hex as encoding right now
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avail = 0xFF - strlen(topdomain) - 2;
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avail /= 2; // use two chars per byte in encoding
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avail -= (avail/CHUNK); // make space for parts
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avail = MIN(avail, len); // do not use more bytes than is available;
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d = data;
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parts = avail / CHUNK;
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for (p = 0; p < parts; p++) {
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for (i = 0; i < CHUNK; i++) {
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sprintf(d, "%02X", buf[p*CHUNK + i]);
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d += 2;
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}
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*d++ = '.';
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strcpy(d, topdomain);
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}
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parts = avail % CHUNK;
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for (i = 0; i < parts; i++) {
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sprintf(d, "%02X", buf[p*CHUNK + i]);
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d += 2;
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}
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*d++ = '.';
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strcpy(d, topdomain);
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printf("Resolving %s\n", data);
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dns_query(fd, id, data, T_A);
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return avail;
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}
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int
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dns_read(int fd, char *buf, int buflen)
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{
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