crda: add regulatory domain stream parser

This adds a stream parser for regulatory domains. This
allows developers to build regulatory domains now using
the db.txt from a stream, either stdin, or a from an
opened file.

This also adds a simple db2rd which for now only uses the
library but with a bit of effort can also be used as a
suitable replacement for the kernel's genregdb.awk.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>

Author: mcgrof

Makefile

@@ -24,10 +24,11 @@ PUBKEY_DIR?=pubkeys
 RUNTIME_PUBKEY_DIR?=/etc/wireless-regdb/pubkeys
 
 CFLAGS += -Wall -g
+LDLIBS += -lm
 
 all: all_noverify verify
 
-all_noverify: crda intersect regdbdump
+all_noverify: crda intersect regdbdump db2rd
 
 ifeq ($(USE_OPENSSL),1)
 CFLAGS += -DUSE_OPENSSL -DPUBKEY_DIR=\"$(RUNTIME_PUBKEY_DIR)\" `pkg-config --cflags openssl`
@@ -121,6 +122,10 @@ intersect: reglib.o intersect.o
 	$(NQ) '  LD  ' $@
 	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LDLIBS)
 
+db2rd: reglib.o db2rd.o
+	$(NQ) '  LD  ' $@
+	$(Q)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LDLIBS)
+
 verify: $(REG_BIN) regdbdump
 	$(NQ) '  CHK  $(REG_BIN)'
 	$(Q)./regdbdump $(REG_BIN) >/dev/null
@@ -152,5 +157,6 @@ install: crda crda.8.gz regdbdump.8.gz
 	$(Q)$(INSTALL) -m 644 -t $(DESTDIR)/$(MANDIR)/man8/ regdbdump.8.gz
 
 clean:
-	$(Q)rm -f crda regdbdump intersect *.o *~ *.pyc keys-*.c *.gz \
+	$(Q)rm -f crda regdbdump intersect db2rd \
+		*.o *~ *.pyc keys-*.c *.gz \
 	udev/$(UDEV_LEVEL)regulatory.rules udev/regulatory.rules.parsed

db2rd.c

@@ -0,0 +1,32 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <arpa/inet.h> /* ntohl */
+#include <string.h>
+
+#include "nl80211.h"
+#include "reglib.h"
+
+int main(int argc, char **argv)
+{
+	struct ieee80211_regdomain *rd = NULL;
+	FILE *fp;
+
+	if (argc != 1) {
+		fprintf(stderr, "Usage: cat db.txt | %s\n", argv[0]);
+		return -EINVAL;
+	}
+
+	fp = reglib_create_parse_stream(stdin);
+	if (!fp)
+		return -EINVAL;
+
+	reglib_for_each_country_stream(fp, rd) {
+		reglib_print_regdom(rd);
+		free(rd);
+	}
+
+	fclose(fp);
+
+	return 0;
+}