fix buf wrongly get subnet

ubuntu_intermediate/intermediate_node.py

@@ -31,16 +31,29 @@ def update_ebpf_file(file_path, subnet_ip, probability, alternate_ips):
     with open(file_path, 'r') as f:
         content = f.read()
 
-    # Update SUBNET_BASE (convert to subnet)
+    # Update SUBNET_BASE
     subnet_hex = ip_to_subnet_hex(subnet_ip)
-    content = re.sub(r"(#define SUBNET_BASE __constant_htonl\()(0x[0-9A-Fa-f]+)(\))", fr"\1{subnet_hex}\3", content)
+    content = re.sub(
+        r'(#define SUBNET_BASE __constant_htonl\()0x[0-9A-Fa-f]+(\))',
+        rf'\g<1>{subnet_hex}\g<2>',  # Using \g<n> for group references
+        content
+    )
 
     # Update REPLACE_PROBABILITY
-    content = re.sub(r"(#define REPLACE_PROBABILITY )\d+", fr"\1{probability}", content)
+    content = re.sub(
+        r'(#define REPLACE_PROBABILITY )\d+',
+        rf'\g<1>{probability}',  # Using \g<1> instead of \1
+        content
+    )
 
-    # Update ALTERNATE_IPS (in one line)
+    # Update ALTERNATE_IPS
     alternate_hex = ', '.join(f'__constant_htonl({ip_to_hex(ip)})' for ip in alternate_ips)
-    content = re.sub(r"(const __be32 ALTERNATE_IPS\[\] = \{)([^\}]+)(\};)", fr"\1 {alternate_hex} \3", content, flags=re.DOTALL)
+    content = re.sub(
+        r'(const __be32 ALTERNATE_IPS\[\] = \{)[^}]*(};)',
+        rf'\g<1>{alternate_hex}\g<2>',
+        content,
+        flags=re.DOTALL
+    )
 
     with open(file_path, 'w') as f:
         f.write(content)
@@ -110,4 +123,6 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
+    file_path = 'inter_op_ebpf.c'
+    update_ebpf_file(file_path, "123.168.1.1", 75, ["123.168.2.2", "123.168.3.3", "123.168.4.4"])
+    # main()