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Added CMC to I and S packet types

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Erik Ekman 2009-06-12 05:44:34 +00:00 committed by Erik Ekman
parent 3eef144fce
commit 950c0870b2
3 changed files with 15 additions and 3 deletions
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2
doc/proto_00000501.txt
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@ -54,10 +54,12 @@ Client sends:
5 bits coded as Base32 char, meaning userid 5 bits coded as Base32 char, meaning userid
5 bits coded as Base32 char, with value 5 or 6, representing number of raw 5 bits coded as Base32 char, with value 5 or 6, representing number of raw
bits per encoded byte bits per encoded byte
CMC
Server sends: Server sends:
Name of codec if accepted. After this all upstream data packets must Name of codec if accepted. After this all upstream data packets must
be encoded with the new codec. be encoded with the new codec.
BADCODEC if not accepted. Client must then revert to Base32 BADCODEC if not accepted. Client must then revert to Base32
BADLEN if length of query is too short
Probe downstream fragment size: Probe downstream fragment size:
Client sends: Client sends:

14
src/iodine.c
View file

@ -476,9 +476,14 @@ send_version(int fd, uint32_t version)
static void static void
send_ip_request(int fd, int userid) send_ip_request(int fd, int userid)
{ {
char buf[512] = "I_."; char buf[512] = "I____.";
buf[1] = b32_5to8(userid); buf[1] = b32_5to8(userid);
buf[2] = b32_5to8((rand_seed >> 10) & 0x1f);
buf[3] = b32_5to8((rand_seed >> 5) & 0x1f);
buf[4] = b32_5to8((rand_seed ) & 0x1f);
rand_seed++;
strncat(buf, topdomain, 512 - strlen(buf)); strncat(buf, topdomain, 512 - strlen(buf));
send_query(fd, buf); send_query(fd, buf);
} }
@ -498,10 +503,15 @@ send_case_check(int fd)
static void static void
send_codec_switch(int fd, int userid, int bits) send_codec_switch(int fd, int userid, int bits)
{ {
char buf[512] = "S__."; char buf[512] = "S_____.";
buf[1] = b32_5to8(userid); buf[1] = b32_5to8(userid);
buf[2] = b32_5to8(bits); buf[2] = b32_5to8(bits);
buf[3] = b32_5to8((rand_seed >> 10) & 0x1f);
buf[4] = b32_5to8((rand_seed >> 5) & 0x1f);
buf[5] = b32_5to8((rand_seed ) & 0x1f);
rand_seed++;
strncat(buf, topdomain, 512 - strlen(buf)); strncat(buf, topdomain, 512 - strlen(buf));
send_query(fd, buf); send_query(fd, buf);
} }

2
src/iodined.c
View file

@ -425,7 +425,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
} else if(in[0] == 'S' || in[0] == 's') { } else if(in[0] == 'S' || in[0] == 's') {
int codec; int codec;
struct encoder *enc; struct encoder *enc;
if (domain_len != 4) { /* len = 4, example: "S15." */ if (domain_len < 3) { /* len at least 3, example: "S15" */
write_dns(dns_fd, q, "BADLEN", 6); write_dns(dns_fd, q, "BADLEN", 6);
return; return;
} }