move openbsc/* to repos root

This is the first step in creating this repository from the legacy openbsc.git.

Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.

Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7

2 files changed, 95 insertions, 0 deletions

diff --git a/contrib/nat/test_regexp.c b/contrib/nat/test_regexp.c
new file mode 100644
index 000000000..808a703ca
--- /dev/null
+++ b/contrib/nat/test_regexp.c
@@ -0,0 +1,30 @@
+/* make test_regexp */
+#include <sys/types.h>
+#include <regex.h>
+#include <stdio.h>
+
+
+int main(int argc, char **argv)
+{
+	regex_t reg;
+	regmatch_t matches[2];
+
+	if (argc != 4) {
+		printf("Invoke with: test_regexp REGEXP REPLACE NR\n");
+		return -1;
+	}
+
+	if (regcomp(&reg, argv[1], REG_EXTENDED) != 0) {
+		fprintf(stderr, "Regexp '%s' is not valid.\n", argv[1]);
+		return -1;
+	}
+
+	if (regexec(&reg, argv[3], 2, matches, 0) == 0 && matches[1].rm_eo != -1)
+		printf("New Number: %s%s\n", argv[2], &argv[3][matches[1].rm_so]);
+	else
+		printf("No match.\n");
+
+	regfree(&reg);
+
+	return 0;
+}
diff --git a/contrib/nat/ussd_example.py b/contrib/nat/ussd_example.py
new file mode 100644
index 000000000..8f7a58d3f
--- /dev/null
+++ b/contrib/nat/ussd_example.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python2.7
+
+"""
+AGPLv3+ 2016 Copyright Holger Hans Peter Freyther
+
+Example of how to connect to the USSD side-channel and how to respond
+with a fixed message.
+"""
+
+import socket
+import struct
+
+ussdSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+ussdSocket.connect(('127.0.0.1', 5001))
+
+def send_dt1(dstref, data):
+    dlen = struct.pack('B', len(data)).encode('hex')
+    hex = '06' + dstref.encode('hex') + '00' + '01' + dlen + data.encode('hex')
+    pdata = hex.decode('hex')
+    out = struct.pack('>HB', len(pdata), 0xfd) + pdata
+    ussdSocket.send(out)
+
+def send_rel(srcref, dstref):
+    hex = '04' + dstref.encode('hex') + srcref.encode('hex') + '000100'
+    pdata = hex.decode('hex')
+    out = struct.pack('>HB', len(pdata), 0xfd) + pdata
+    ussdSocket.send(out)
+
+def recv_one():
+    plen = ussdSocket.recv(3)
+    (plen,ptype) = struct.unpack(">HB", plen)
+    data = ussdSocket.recv(plen)
+
+    return ptype, data
+
+# Assume this is the ID request
+data = ussdSocket.recv(4)
+ussdSocket.send("\x00\x08\xfe\x05\x00" + "\x05\x01" + "ussd")
+#                      ^len                ^len of tag ... and ignore
+
+# Expect a fake message. see struct ipac_msgt_sccp_state
+ptype, data = recv_one()
+print("%d %s" % (ptype, data.encode('hex')))
+(srcref, dstref, transid, invokeid) = struct.unpack("<3s3sBB", data[1:9])
+print("New transID %d invoke %d" % (transid, invokeid))
+
+# Expect a the invocation.. todo.. extract invoke id
+ptype, data = recv_one()
+print("%d %s" % (ptype, data.encode('hex')))
+
+# Reply with BSSAP + GSM 04.08 + MAP portion
+#                                    00 == invoke id     0f == DCS
+res = "01002a9b2a0802e1901c22a220020100301b02013b301604010f041155e7d2f9bc3a41412894991c06a9c9a713"
+send_dt1(dstref, res.decode('hex'))
+
+clear = "000420040109"
+send_dt1(dstref, clear.decode('hex'))
+
+# should be the clear complete
+send_rel(srcref, dstref)
+
+# Give it some time to handle connection shutdown properly
+print("Gracefully sleeping")
+import time
+time.sleep(3)