I try here to present the problem as clear as possible.
I make these changes to 5.6, which let me see the input and output of
th_mask_encode and th_mask_decode.
```diff
diff --git a/src/modules/topoh/th_mask.c b/src/modules/topoh/th_mask.c
index 122d0935a5..895864e3c4 100644
--- a/src/modules/topoh/th_mask.c
+++ b/src/modules/topoh/th_mask.c
@@ -93,6 +93,7 @@ char* th_mask_encode(char *in, int ilen, str *prefix, int
*olen)
int r;
char *p;
int block;
+ LM_ERR("th_mask_encode C in=[%s] ilen=%i prefix=[%.*s]\n", in, ilen,
prefix->len, prefix->s);
*olen = (((ilen+2)/3)<<2) +
((prefix!=NULL&&prefix->len>0)?prefix->len:0);
out = (char*)pkg_malloc((*olen+1)*sizeof(char));
@@ -121,7 +122,7 @@ char* th_mask_encode(char *in, int ilen, str *prefix, int
*olen)
*(p++) = (left>0)?_th_EB64[(block >> 6) & 0x3f]:_th_PD64[0];
*(p++) = (left>1)?_th_EB64[block & 0x3f]:_th_PD64[0];
}
-
+ LM_ERR("th_mask_encode D in=[%s] ilen=%i prefix=[%.*s] out=[%s],
olen=%i\n", in, ilen, prefix->len, prefix->s, out, *olen);
return out;
}
@@ -135,6 +136,7 @@ char* th_mask_decode(char *in, int ilen, str *prefix, int
extra, int *olen)
int j;
int end;
char c;
+ LM_ERR("th_mask_decode A in=[%s] ilen=%i prefix=[%.*s] extra=%i\n", in,
ilen, prefix->len, prefix->s, extra);
for(n=0,i=ilen-1; in[i]==_th_PD64[0]; i--)
n++;
@@ -178,7 +180,7 @@ char* th_mask_decode(char *in, int ilen, str *prefix, int
extra, int *olen)
for(j=0, n=16; j<3 && idx+j< *olen; j++, n-=8)
out[idx+j] = (char)((block >> n) & 0xff);
}
-
+ LM_ERR("th_mask_decode B in=[%s] ilen=%i prefix=[%.*s] extra=%i
out=[%s], olen=%i\n", in, ilen, prefix->len, prefix->s, extra, out, *olen);
return out;
}
```
I log the traffic using sipdump/KEMI, I believe this is the equivalent of using
pcap:
```lua
function ksr_sipdump_event(evname)
KSR.err("ksr_sipdump_event 1--------- " .. evname .. " src " ..
KSR.pv.gete("$sipdump(src_ip)") .. ':' .. KSR.pv.gete("$sipdump(src_port)") ..
" dst " .. KSR.pv.gete("$sipdump(dst_ip)") .. ':' ..
KSR.pv.gete("$sipdump(dst_port)") .. "\n" .. KSR.pv.gete("$sipdump(buf)") ..
"\n")
return 1
end
```
The test case is: a websocket client calls Linphone, they talk and finally
Linphone hangs up.
Traffic without topoh -
[without-topoh.txt](https://github.com/kamailio/kamailio/files/10745403/without-topoh.txt)
Traffic with topoh and the above logging from th_mask_encode/th_mask_decode -
[with-topoh.txt](https://github.com/kamailio/kamailio/files/10745414/with-topoh.txt)
As can be seen in the latter file, Linphone receives:
```
INVITE sip:[email protected]:33392;transport=tls SIP/2.0
Record-Route:
<sip:[email protected]:5061;transport=tls;r2=on;lr;ftag=p702o1dak9;did=99d.b2a2;nat=yes>
Record-Route:
<sip:127.3.4.84;line=sr-BkHOV3ilcl0v8gmkcFJsLXCCo6YwnboD9b0bwo9imwUAVb7U7WtTm1ygmpyamW.AmQN4LSi0IqmOIgiTDXLQVg.eDFUAVkaeVkcThFBUBWBO83MaclYsVbGK5F7UVbHKu3.ehb.4I3YTDXHHBO**>
Via: SIP/2.0/TLS
144.76.142.78:5061;branch=z9hG4bK78b4.77ca12d776048c779e71b6216dd967a0.0
Via: SIP/2.0/UDP
127.3.4.84;branch=z9hG4bKsr-wTH7uQ.A81UXw68NmW0QmWoHI3K6B3GAu3HAL3Yv5F74BqCEBq7UmWdJ8zh4B3ozcFHkcF7U8b7TuzBkuztT8pygVWGwnW6K5Xh4hqi0I3mZDXZJ5tBThKvJ8QtaVbhg
Max-Forwards: 69
To: <sip:[email protected]>
From: "Online https://sip.bapha.be"; <sip:[email protected]>;tag=p702o1dak9
Call-ID: b9kkank0a5398g9odcre
CSeq: 134 INVITE
Contact:
<sip:127.3.4.84;line=sr-BkHOV3JKcFosIScv7W7yBQ76cFJjmXisIpJjIqc0IlHKVkYv5FYQDbtTm1ygmpyamW.AmQ02mWdJ8zc2mbGTB3YABgCEBq7ULg84Ik.*>
```
and later sends
```
BYE
sip:127.3.4.84;line=sr-BkHOV3JKcFosIScv7W7yBQ76cFJjmXisIpJjIqc0IlHKVkYv5FYQDbtTm1ygmpyamW.AmQ02mWdJ8zc2mbGTB3YABgCEBq7ULg84Ik.*
SIP/2.0
```
topoh_decode is called with
```
22(23) ERROR: topoh [th_mask.c:183]: th_mask_decode(): th_mask_decode B
in=[sr-bkhovq9hbg7gckjeifwghkyvismdh3yo5ltah3w4cg.ulxiavqo65f7rc
zi3mftqhkhghbc3hpto8w7gufihmbdgmq7oc3.jh39zmbhevkyv5fyqdbnguztav1yamwha8bwqfz8q8qkofz8*
SIP/2.0
Route:
<sip:[email protected];transport=ws;r2=on;lr;ftag=p702o1dak9;did=99d.b2a2;nat=yes>
Route:
<sip:127.3.4.84;line=sr-BkHOV3ilcl0v8gmkcFJsLXCCo6YwnboD9b0bwo9imwUAVb7U7WtTm1ygmpyamW.AmQNRmbdk8bGTB3YABgCEBq7ULlaQVg.eDFUAVkaeV
kcThFBUBWBO83MaclYsVbGK5F7UVbHKu3.ehb.4I3YTDXHHBO**>
Via: SIP/2.0/WSS 48s45eni5rkn.invalid;branch=z9hG4bK1491699
Max-Forwards: 70
To: <sip:[email protected]>;tag=ulIz8kV
From: "Online https://sip.bapha.be"; <sip:[email protected]>;tag=p702o1dak9
Call-ID: b9kkank0a5398g9odcre
CSeq: 134 ACK
Supported: outbound
User-Agent: SIP.js/0.7.8
Content-Length: 0
] ilen=147 prefix=[sr-] extra=0
out=[Of^U<B2>tXOt7gjr%<F5>7cn,&<B3>@bn^Uha1be;gr^K^X<A2>q<B2>uui<F4>*f2f5<F1>'cf7a6fb!^U1D7-<F2>X5076t^U
fb)bdc562<B3>n,i<FE>'^A4<B7>.11<B0>.15F115'~3'2}<95>~3], olen=107
```
and the output is garbage:
```
22(23) ERROR: kemix [kemix_mod.c:229]: ki_kx_get_ruri_attr(): failed to parse
the R-URI
22(23) ERROR: rr [loose.c:1011]: loose_route_mode(): failed to parse Request URI
```
The parameters I passed in the sample program above are not arbitrary invented
by me, but were taken from real-life occasions.
The file with-topoh.txt contains the input and output of Kamailio, according
the sipdump module, and the input and output of the th_mask_decode() and
th_mask_encode() functions.
--
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https://github.com/kamailio/kamailio/issues/3358#issuecomment-1431688727
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