sendMessage truncates the response sent to stdout

[twirtgen]

Hi,

When I manually compile the beidconnect executable under Linux:

• GCC 14.2.1
• boost 1.86.0
• pcsclite 2.3.0
• libc 2.40

I am unable to use the compiled binary to interact with the signing web app.

I noticed that the sendMessage() function truncates the last character of the response:

fts-beidconnect/common/comm.cpp

Line 89 in b44810e

std::string response2 = response.substr(0, response.length() - 1);

The above line removes the last character of the string. In the case of a JSON response, the closing } is removed, resulting in a malformed JSON string. This causes the Native Messaging Extension on Firefox to fail when attempting to parse the response.

As a workaround, removing the - 1 solves the problem. I've tested this fix and it now seems to interact correctly with the Signing Box.