Re: [PATCH] Add `verify-system` sslmode to use system CA pool for server cert

Daniel Gustafsson <daniel@yesql.se> writes:
> Good points, it should of course be SOCK_ERRNO.  The attached saves off errno
> and reinstates it to avoid clobbering.  Will test it on Windows in the morning
> as well.

I think instead of this:

+                    SOCK_ERRNO_SET(save_errno);

you could just do this:

                         libpq_append_conn_error(conn, "SSL SYSCALL error: %s",
-                                           SOCK_STRERROR(SOCK_ERRNO, sebuf, sizeof(sebuf)));
+                                           SOCK_STRERROR(save_errno, sebuf, sizeof(sebuf)));

Although ... we're already assuming that SSL_get_error and ERR_get_error
don't clobber errno.  Maybe SSL_get_verify_result doesn't either.
Or we could make it look like this:

+    SOCK_ERRNO_SET(0);
     ERR_clear_error();
     r = SSL_connect(conn->ssl);
     if (r <= 0)
+       int            save_errno = SOCK_ERRNO;
        int            err = SSL_get_error(conn->ssl, r);
        unsigned long ecode;

        ...

-                                           SOCK_STRERROR(SOCK_ERRNO, sebuf, sizeof(sebuf)));
+                                           SOCK_STRERROR(save_errno, sebuf, sizeof(sebuf)));

to remove all doubt.

            regards, tom lane