nat: Allow to use the prefix lookup to rewrite numbers

* Increase the rewritten rule to five digits (this is the easiest
  for the unit test). This will add another 40kb to the runtime size.

* Create a unit test that tests adding and removing the prefix rules.

* Use the regexp match to replace from one package

1 files changed, 19 insertions, 0 deletions

diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c b/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c
index 57043acc9..faceb59b5 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat_rewrite_trie.c
@@ -21,6 +21,7 @@
 
 #include <openbsc/nat_rewrite_trie.h>
 #include <openbsc/debug.h>
+#include <openbsc/vty.h>
 
 #include <osmocom/core/talloc.h>
 #include <osmocom/core/utils.h>
@@ -238,3 +239,21 @@ void nat_rewrite_dump(struct nat_rewrite *rewrite)
 {
 	nat_rewrite_dump_rec(&rewrite->rule);
 }
+
+static void nat_rewrite_dump_rec_vty(struct vty *vty, struct nat_rewrite_rule *rule)
+{
+	int i;
+	if (!rule->empty)
+		vty_out(vty, "%s,%s%s", rule->prefix, rule->rewrite, VTY_NEWLINE);
+
+	for (i = 0; i < ARRAY_SIZE(rule->rules); ++i) {
+		if (!rule->rules[i])
+			continue;
+		nat_rewrite_dump_rec_vty(vty, rule->rules[i]);
+	}
+}
+
+void nat_rewrite_dump_vty(struct vty *vty, struct nat_rewrite *rewrite)
+{
+	nat_rewrite_dump_rec_vty(vty, &rewrite->rule);
+}