Function write_keylog_line

src/sslsocket.cpp:120–141

Add a LF to the keylog line and return the number of bytes written or 0 if * writing fails. * see: https://www.ietf.org/archive/id/draft-thomson-tls-keylogfile-00.html https://github.com/tlswg/sslkeylogfile */

    https://github.com/tlswg/sslkeylogfile
*/
static int write_keylog_line(const char* filename, const char *line)
{
    FILE *keylog_fp = nullptr;
    char buf[256]; /* current keylog maximum line length is 195 */
    size_t line_len = strlen(line);

    if(line_len == 0 || line_len > sizeof(buf) - 2) {
        /* Empty line or too big to fit in a LF and NULL. */
        return 0;
    }
    keylog_fp = fopen(filename, "a");
    if (keylog_fp) {
        memcpy(buf, line, line_len);
        if(line[line_len - 1] != '\n') {
            buf[line_len++] = '\n';
        }
        buf[line_len] = '\0';
        fputs(buf, keylog_fp);
        fclose(keylog_fp);
    }
    return line_len-1;
}

static void sip_tls_keylog_callback(const SSL *ssl, const char *line)
{