openssl: encode the value of fd (ssl->wbio->num) to gen uuid, rather than an unexpected random number

[wuyexkx]

make the format of uuid consistent with SSL_read, get the fd rather than a random value

[cfc4n]

Please provide a detailed description of the functionality of this PR. Also, read the code carefully to ensure that you are familiar enough with the modified code and understand its purpose.

[cfc4n]

hello @wuyexkx

[wuyexkx]

Please provide a detailed description of the functionality of this PR. Also, read the code carefully to ensure that you are familiar enough with the modified code and understand its purpose.

the format related to uuid is: fmt.Sprintf("%d_%d_%s_%d_%d", se.Pid, se.Tid, CToGoString(se.Comm[:]), se.Fd, se.DataType), example:
tls_2024/03/03 00:46:22 UUID:1114108_1114108_https_example_4_0 ...
tls_2024/03/03 00:50:10 UUID:1114108_1114108_https_example_1456828997_1 ...
tls_2024/03/03 00:50:48 UUID:1117935_1117935_https_example_9253395096_1 ...

// https://github.com/openssl/openssl/blob/OpenSSL_1_1_1-stable/ssl/ssl_local.h#L1083
struct ssl_st {
...
/* used by SSL_write */
BIO *wbio;
...
}

we want to get value of the fd (ssl->wbio->num) from the first arg of SSL_write(SSL *ssl, ...) to encode uuid,
wbio is a pointer, (ssl + SSL_ST_WBIO) is position of this pointer, ssl->wbio == *(ssl + SSL_ST_WBIO), != (ssl + SSL_ST_WBIO),
so ssl->wbio->num == ((ssl + SSL_ST_WBIO) + BIO_ST_NUM).
could refer to SSL_read(SSL *ssl, ...), its correct.

[cfc4n]

OK, I understand what you mean. However, I have a question.

tls_2024/03/03 00:46:22 UUID:1114108_1114108_https_example_4_0 ...
tls_2024/03/03 00:50:10 UUID:1114108_1114108_https_example_1456828997_1 ...
tls_2024/03/03 00:50:48 UUID:1117935_1117935_https_example_9253395096_1 ...

Why is the FD correct in https_example_4_0 in these logs?

Please also provide a description of how to reproduce it.

[cfc4n]

I reproduced it.

LGTM, Thanks.

[wuyexkx]

I reproduced it.

LGTM, Thanks.

OK, 3Q very much!