[pve-devel] [PATCH proxmox v2 0/5] sys: email: always format 'Date' header with C locale

[Lukas Wagner]

On 12/11/23 14:29, Lukas Wagner wrote:
> This patch series makes the formatting of the 'Date' header for sent emails
> independent of the system locale. Previously, strftime was used to generate
> the header, but since this function is locale-aware, invalid Date headers
> could be generated.
> As an example, if the locale was `de_DE.UTF-8`, then
> 
> Date: Di, 05 Dez 2023 12:05:50 +0100
>   instead of
> Date: Tue, 05 Dec 2023 12:05:50 +0100
> 
> would be generated, violating RFC2822 [1]. This trips up some email clients
> (e.g. KMail), making them fall back to Jan 1970 (epoch 0).
> 
> This is fixed by adding `strftime_l`, which allows passing a locale to
> used. Additionally, `epoch_to_rfc2822` was added, which formats a
> unix epoch value to a valid RFC2822 date string (with a fixed "C" locale).
> 
> Popped up in our forum:
> https://forum.proxmox.com/threads/pve-mail-notification-kein-datum-mehr-zum-korrekten-einsortieren.137556
> 
> The following projects need to be bumped and rebuilt:
>    - proxmox_sys, and therefore
>        - proxmox_notify, and therefore
>            - libpve-rs-perl
>            - proxmox-mail-forward
>        - proxmox-backup (uses proxmox_sys::email::sendmail directly)
> 
> [1] https://www.rfc-editor.org/rfc/rfc2822#section-3.3
> 
> Changes v1 -> v2:
>   - Fix TZ-dependent test case
> 
> Lukas Wagner (5):
>    time: posix: use strftime from the `libc` crate.
>    time: posix: inline vars in string formatting
>    time: posix: add bindings for strftime_l
>    time: posix: add epoch_to_rfc2822
>    sys: email: use `epoch_to_rfc2822` from proxmox_time
> 
>   proxmox-sys/src/email.rs  |   3 +-
>   proxmox-time/src/posix.rs | 151 +++++++++++++++++++++++++++++++-------
>   2 files changed, 126 insertions(+), 28 deletions(-)
> 

ping

-- 
- Lukas