From 5c4b93d72ecf6d1d5b21a60b3e78db3948d0f034 Mon Sep 17 00:00:00 2001
From: Jouni Malinen <j@w1.fi>
Date: Tue, 7 Aug 2012 13:50:39 +0300
Subject: [PATCH] Add support for using printf-escaped strings in configuration

P"<escaped string>" can now be used as an alternative method for
specifying non-ASCII strings (including control characters). For
example, ssid=P"abc\x00test".

Signed-hostap: Jouni Malinen <j@w1.fi>
---
 wpa_supplicant/config.c            | 25 +++++++++++++++++++++++++
 wpa_supplicant/wpa_supplicant.conf |  6 ++++--
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/wpa_supplicant/config.c b/wpa_supplicant/config.c
index 0ce4d0949..94052c5fa 100644
--- a/wpa_supplicant/config.c
+++ b/wpa_supplicant/config.c
@@ -68,6 +68,31 @@ static char * wpa_config_parse_string(const char *value, size_t *len)
 			return NULL;
 		os_memcpy(str, value, *len);
 		str[*len] = '\0';
+		return str;
+	} else if (*value == 'P' && value[1] == '"') {
+		const char *pos;
+		char *tstr, *str;
+		size_t tlen;
+		value += 2;
+		pos = os_strrchr(value, '"');
+		if (pos == NULL || pos[1] != '\0')
+			return NULL;
+		tlen = pos - value;
+		tstr = os_malloc(tlen + 1);
+		if (tstr == NULL)
+			return NULL;
+		os_memcpy(tstr, value, tlen);
+		tstr[tlen] = '\0';
+
+		str = os_malloc(tlen + 1);
+		if (str == NULL) {
+			os_free(tstr);
+			return NULL;
+		}
+
+		*len = printf_decode((u8 *) str, tlen + 1, tstr);
+		os_free(tstr);
+
 		return str;
 	} else {
 		u8 *str;
diff --git a/wpa_supplicant/wpa_supplicant.conf b/wpa_supplicant/wpa_supplicant.conf
index 1154aba3a..37e36b343 100644
--- a/wpa_supplicant/wpa_supplicant.conf
+++ b/wpa_supplicant/wpa_supplicant.conf
@@ -406,8 +406,10 @@ fast_reauth=1
 #	to external action script through wpa_cli as WPA_ID_STR environment
 #	variable to make it easier to do network specific configuration.
 #
-# ssid: SSID (mandatory); either as an ASCII string with double quotation or
-#	as hex string; network name
+# ssid: SSID (mandatory); network name in one of the optional formats:
+#	- an ASCII string with double quotation
+#	- a hex string (two characters per octet of SSID)
+#	- a printf-escaped ASCII string P"<escaped string>"
 #
 # scan_ssid:
 #	0 = do not scan this SSID with specific Probe Request frames (default)