[gnutls-devel] GnuTLS | set_read_funcs() breaks I/O on Windows (#757)
Development of GNU's TLS library
gnutls-devel at lists.gnutls.org
Wed Apr 24 07:55:24 CEST 2019
New Issue was created.
Issue 757: https://gitlab.com/gnutls/gnutls/issues/757
## Description of problem:
GnuTLS code calls `set_read_funcs()` at some points. On non-Windows platforms that function is a no-op. On Windows it replaces session push and pull functions with `system_write()` and `system_read()`.
This means that even if the client code (such as GnuTLS's own `socket_open2()`) calls `gnutls_transport_set_push_function()` to set some custom push function, GnuTLS will later set it back to the defaults. Because `socket_open2()` also sets the transport ptr as a pointer to a custom struct that holds, among other things, the socket descriptor, using `system_*()` functions with that ptr leads to EBADF errors.
## Version of gnutls used:
## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
## How reproducible:
Steps to Reproduce:
* Build GnuTLS with MinGW
* run `gnutls-cli google.com`
## Actual results:
*** Fatal error: Error in the push function.
Could not connect to 220.127.116.11:443: Bad file descriptor
## Expected results:
It should be noted that `gnutls_init()` will also set session push and pull functions to `system_write()` and `system_read()`. At first glance it doesn't make sense for GnuTLS to do that *again* later on.
Reply to this email directly or view it on GitLab: https://gitlab.com/gnutls/gnutls/issues/757
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