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#7, add probe fragsize support for server. documented

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This commit is contained in:
Erik Ekman 2009-01-10 16:22:51 +00:00
parent 49e448fb19
commit 9a139b7005
2 changed files with 34 additions and 1 deletions
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11
doc/proto_00000403.txt
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@ -46,6 +46,17 @@ Server sends:
be encoded with the new codec.
BADCODEC if not accepted. Client must then revert to Base32
Probe downstream fragment size:
Client sends:
First byte r or R
15 bits coded as 3 Base32 chars: UUUUF FFFFF FFFFF
meaning 4 bits userid, 11 bits fragment size
Then follows a long random query which contents does not matter
Server sends:
Requested number of bytes as a response. The first two bytes contains
the requested length. Rest of message can be any data.
BADFRAG if requested length not accepted.
Set downstream fragment size:
Client sends:
First byte n or N

24
src/iodined.c
View file

@ -377,6 +377,28 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
break;
}
return;
} else if(in[0] == 'R' || in[0] == 'r') {
int req_frag_size;
/* Downstream fragsize probe packet */
userid = (b32_8to5(in[1]) >> 1) & 15;
if (userid < 0 || userid >= USERS || ip_cmp(userid, q) != 0) {
write_dns(dns_fd, q, "BADIP", 5);
return; /* illegal id */
}
req_frag_size = ((b32_8to5(in[1]) & 1) << 10) | ((b32_8to5(in[2]) & 31) << 5) | (b32_8to5(in[3]) & 31);
if (req_frag_size < 2 || req_frag_size > 2047) {
write_dns(dns_fd, q, "BADFRAG", 7);
} else {
char buf[2048];
memset(buf, 0, sizeof(buf));
buf[0] = (req_frag_size >> 8) & 0xff;
buf[1] = req_frag_size & 0xff;
write_dns(dns_fd, q, buf, req_frag_size);
}
return;
} else if(in[0] == 'N' || in[0] == 'n') {
int max_frag_size;
@ -389,7 +411,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
}
max_frag_size = ((unpacked[1] & 0xff) << 8) | (unpacked[2] & 0xff);
if (max_frag_size < 1) {
if (max_frag_size < 2) {
write_dns(dns_fd, q, "BADFRAG", 7);
} else {
users[userid].fragsize = max_frag_size;