nixpkgs/pkgs/os-specific/linux/wpa_supplicant/0001-Implement-read-only-mode-for-ssids.patch

From 99ae610f0ae3608a12c864caedf396f14e68327d Mon Sep 17 00:00:00 2001
From: Maximilian Bosch <maximilian@mbosch.me>
Date: Fri, 19 Feb 2021 19:44:21 +0100
Subject: [PATCH] Implement read-only mode for ssids

With this change it's possible to define `network=`-sections in a second
config file specified via `-I` without having changes written to
`/etc/wpa_supplicant.conf`.

This is helpful on e.g. NixOS to allow both declarative (i.e. read-only)
and imperative (i.e. mutable) networks.
---
 wpa_supplicant/config.h         | 2 +-
 wpa_supplicant/config_file.c    | 5 +++--
 wpa_supplicant/config_none.c    | 2 +-
 wpa_supplicant/config_ssid.h    | 2 ++
 wpa_supplicant/wpa_supplicant.c | 8 ++++----
 5 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/wpa_supplicant/config.h b/wpa_supplicant/config.h
index 6a297ecfe..adaf4d398 100644
--- a/wpa_supplicant/config.h
+++ b/wpa_supplicant/config.h
@@ -1614,7 +1614,7 @@ const char * wpa_config_get_global_field_name(unsigned int i, int *no_var);
  *
  * Each configuration backend needs to implement this function.
  */
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp);
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro);
 
 /**
  * wpa_config_write - Write or update configuration data
diff --git a/wpa_supplicant/config_file.c b/wpa_supplicant/config_file.c
index 77c326df5..d5ed051b9 100644
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -373,7 +373,7 @@ static int wpa_config_process_blob(struct wpa_config *config, FILE *f,
 #endif /* CONFIG_NO_CONFIG_BLOBS */
 
 
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro)
 {
 	FILE *f;
 	char buf[512], *pos;
@@ -415,6 +415,7 @@ struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
 	while (wpa_config_get_line(buf, sizeof(buf), f, &line, &pos)) {
 		if (os_strcmp(pos, "network={") == 0) {
 			ssid = wpa_config_read_network(f, &line, id++);
+			ssid->ro = ro;
 			if (ssid == NULL) {
 				wpa_printf(MSG_ERROR, "Line %d: failed to "
 					   "parse network block.", line);
@@ -1591,7 +1592,7 @@ int wpa_config_write(const char *name, struct wpa_config *config)
 	}
 
 	for (ssid = config->ssid; ssid; ssid = ssid->next) {
-		if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary)
+		if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary || ssid->ro == 1)
 			continue; /* do not save temporary networks */
 		if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt) && !ssid->psk_set &&
 		    !ssid->passphrase)
diff --git a/wpa_supplicant/config_none.c b/wpa_supplicant/config_none.c
index 2aac28fa3..02191b425 100644
--- a/wpa_supplicant/config_none.c
+++ b/wpa_supplicant/config_none.c
@@ -17,7 +17,7 @@
 #include "base64.h"
 
 
-struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp)
+struct wpa_config * wpa_config_read(const char *name, struct wpa_config *cfgp, int ro)
 {
 	struct wpa_config *config;
 
diff --git a/wpa_supplicant/config_ssid.h b/wpa_supplicant/config_ssid.h
index d5c5c00a9..fd80c079c 100644
--- a/wpa_supplicant/config_ssid.h
+++ b/wpa_supplicant/config_ssid.h
@@ -93,6 +93,8 @@ struct wpa_ssid {
 	 */
 	int id;
 
+	int ro;
+
 	/**
 	 * priority - Priority group
 	 *
diff --git a/wpa_supplicant/wpa_supplicant.c b/wpa_supplicant/wpa_supplicant.c
index 911d79d17..cb0cb99b1 100644
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -1052,14 +1052,14 @@ int wpa_supplicant_reload_configuration(struct wpa_supplicant *wpa_s)
 
 	if (wpa_s->confname == NULL)
 		return -1;
-	conf = wpa_config_read(wpa_s->confname, NULL);
+	conf = wpa_config_read(wpa_s->confname, NULL, 0);
 	if (conf == NULL) {
 		wpa_msg(wpa_s, MSG_ERROR, "Failed to parse the configuration "
 			"file '%s' - exiting", wpa_s->confname);
 		return -1;
 	}
 	if (wpa_s->confanother &&
-	    !wpa_config_read(wpa_s->confanother, conf)) {
+	    !wpa_config_read(wpa_s->confanother, conf, 1)) {
 		wpa_msg(wpa_s, MSG_ERROR,
 			"Failed to parse the configuration file '%s' - exiting",
 			wpa_s->confanother);
@@ -5638,7 +5638,7 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
 #else /* CONFIG_BACKEND_FILE */
 		wpa_s->confname = os_strdup(iface->confname);
 #endif /* CONFIG_BACKEND_FILE */
-		wpa_s->conf = wpa_config_read(wpa_s->confname, NULL);
+		wpa_s->conf = wpa_config_read(wpa_s->confname, NULL, 0);
 		if (wpa_s->conf == NULL) {
 			wpa_printf(MSG_ERROR, "Failed to read or parse "
 				   "configuration '%s'.", wpa_s->confname);
@@ -5646,7 +5646,7 @@ static int wpa_supplicant_init_iface(struct wpa_supplicant *wpa_s,
 		}
 		wpa_s->confanother = os_rel2abs_path(iface->confanother);
 		if (wpa_s->confanother &&
-		    !wpa_config_read(wpa_s->confanother, wpa_s->conf)) {
+		    !wpa_config_read(wpa_s->confanother, wpa_s->conf, 1)) {
 			wpa_printf(MSG_ERROR,
 				   "Failed to read or parse configuration '%s'.",
 				   wpa_s->confanother);
-- 
2.29.2