File crda-default.patch of Package crda

Provide an option to specify a reg code in /etc/default/crda
and also try a distribution configuration /usr/etc/default/crda.
This solves bug boo#1179308

---
 crda.8 |   17 ++++++++++++++++-
 crda.c |   43 +++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/crda.8 b/crda.8
--- a/crda.8
+++ b/crda.8
@@ -68,7 +68,22 @@ An example udev rule which can be used (
 .B /lib/udev/rules.d/85-regulatory.rules
 ):
 
-.I KERNEL=="regulatory*", ACTION=="change", SUBSYSTEM=="platform", RUN+="/sbin/crda"
+.I KERNEL=="regulatory*", ACTION=="change", SUBSYSTEM=="platform", RUN+="/usr/sbin/crda"
+
+.SS
+.SH Standard configuration
+in the file
+.I /usr/etc/default/crda
+the variable
+.B REGDOMAIN
+is set to the global WLAN default code
+.BR 00 .
+The local administrator might copy this file to
+.I /etc/default/crda
+and set the ISO / IEC 3166 alpha2 country code of the local area. Then
+any execution of
+.B crda
+will then send this as regulatory domain for that alpha2 to the kernel.
 
 .SS
 .SH Environment variable
diff --git a/crda.c b/crda.c
--- a/crda.c
+++ b/crda.c
@@ -4,6 +4,7 @@
  * Userspace helper which sends regulatory domains to Linux via nl80211
  */
 
+#include <ctype.h>
 #include <errno.h>
 #include <stdio.h>
 #include <fcntl.h>
@@ -156,6 +157,11 @@ int main(int argc, char **argv)
 	struct nlattr *nl_reg_rules;
 	const struct ieee80211_regdomain *rd = NULL;
 
+	const char *default_paths[] = {
+		"/etc/default/crda", /* Users configuration if COUNTRY is not set */
+		"/usr/etc/default/crda", /* General configuration if COUNTRY is not set */
+		NULL
+	};
 	const char *regdb_paths[] = {
 		"/usr/local/lib/crda/regulatory.bin", /* Users/preloads can override */
 		"/usr/lib/crda/regulatory.bin", /* General distribution package usage */
@@ -171,8 +177,41 @@ int main(int argc, char **argv)
 
 	env_country = getenv("COUNTRY");
 	if (!env_country) {
-		fprintf(stderr, "COUNTRY environment variable not set.\n");
-		return -EINVAL;
+		const char **conf  = default_paths;
+		while (*conf != NULL) {
+			fd = open(*conf, O_RDONLY);
+			if (fd >= 0)
+				break;
+			conf++;
+		}
+		if (fd >= 0) {
+			FILE *reg = fdopen(fd, "r");
+			if (reg) {
+				char *line = NULL;
+				ssize_t nread;
+				size_t len = 0;
+				while ((nread = getline(&line, &len, reg)) != -1) {
+					char *ptr = line;
+					if (*ptr == '#' || *ptr == '\n')
+						continue;
+					while (isspace(*ptr))
+						line++;
+					if (strncmp("REGDOMAIN=", ptr, 10) == 0) {
+						ptr += 10;
+						env_country = strndup(ptr, 2);
+						break;
+					}	
+				}
+				if (line)
+					free(line);
+				fclose(reg);
+			} else
+				close(fd);
+		}
+		if (!env_country) {
+			fprintf(stderr, "COUNTRY environment variable not set.\n");
+			return -EINVAL;
+		}
 	}
 
 	if (!reglib_is_valid_regdom(env_country)) {