hostapd/wpa_supplicant/config_none.c

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/*
* WPA Supplicant / Configuration backend: empty starting point
* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*
* This file implements stub example of a configuration backend. None of the
* functions are actually implemented so this can be used as a simple
* compilation test or a starting point for a new configuration backend.
*/
#include "includes.h"
#include "common.h"
#include "config.h"
#include "base64.h"
Implement read-only mode for SSIDs from the additional config (-I) On NixOS[1] - a Linux distribution which allows to configure a full OS declaratively - it's possible to configure SSIDs for `wpa_supplicant` like this: networking.wireless.networks = { myssid = { pskRaw = "<redacted>"; }; }; It's also possible to add networks "imperatively" using `wpa_gui` or `wpa_cli`. However it's not possible to do both because if the first option is used, NixOS creates a read-only symlink at `/etc/wpa_supplicant.conf` and then it's not possible for `wpa_supplicant` anymore to write to it. This patch aims to help us changing this: while "declarative" SSID configuration can be quite useful, it's a bad idea for e.g. sensitive stuff like a WPA2 enterprise network. The original idea was to use `-I`[2] for immutable configs (including "declarative" networks) on NixOS and `-c /etc/wpa_supplicant.conf` for anything "imperative". However this doesn't really work out because if a wifi network from a config file specified with `-I` is changed by e.g. `wpa_gui`, it's silently overwritten in `/etc/wpa_supplicant.conf` (specified with `-c`) which is IMHO unintuitive (in our case at least). This patch basically declares each network defined in a config file passed via `-I` to `wpa_supplicant` as "read-only" and doesn't write these "read-only" networks to `/etc/wpa_supplicant.conf`. A bit more context can be found on GitHub in the PR where I implemented this[3]. [1] https://nixos.org/ [2] Added in e6304cad47251e88d073553042f1ea7805a858d1 [3] https://github.com/NixOS/nixpkgs/pull/113716 Signed-off-by: Maximilian Bosch <maximilian@mbosch.me>
2021-05-05 15:53:43 +02:00
struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp,
bool ro)
{
struct wpa_config *config;
if (name == NULL)
return NULL;
if (cfgp)
config = cfgp;
else
config = wpa_config_alloc_empty(NULL, NULL);
if (config == NULL)
return NULL;
/* TODO: fill in configuration data */
return config;
}
int wpa_config_write(const char *name, struct wpa_config *config)
{
struct wpa_ssid *ssid;
struct wpa_config_blob *blob;
wpa_printf(MSG_DEBUG, "Writing configuration file '%s'", name);
/* TODO: write global config parameters */
for (ssid = config->ssid; ssid; ssid = ssid->next) {
/* TODO: write networks */
}
for (blob = config->blobs; blob; blob = blob->next) {
/* TODO: write blobs */
}
return 0;
}