apps/net: add ip conflict check API

Supports checking for IP conflicts on a NIC.

Signed-off-by: meijian <meijian@xiaomi.com>

Author: Meissi-jian

include/netutils/netlib.h

@@ -499,6 +499,12 @@ int netlib_getifstatistics(FAR const char *ifname,
                            FAR struct netdev_statistics_s *stat);
 #endif
 
+/* Network check support */
+
+#ifdef CONFIG_NET_ARP_ACD
+int netlib_check_ifconflict(FAR const char *ifname);
+#endif
+
 #undef EXTERN
 #ifdef __cplusplus
 }

netutils/netlib/CMakeLists.txt

@@ -143,6 +143,12 @@ if(CONFIG_NETUTILS_NETLIB)
     endif()
   endif()
 
+  # Network check support
+
+  if(CONFIG_NET_ARP_ACD)
+    list(APPEND SRCS netlib_checkifconflict.c)
+  endif()
+
   target_sources(apps PRIVATE ${SRCS})
 
 endif()

netutils/netlib/Makefile

@@ -142,4 +142,10 @@ CSRCS += netlib_ipmsfilter.c
 endif
 endif
 
+# Network check support
+
+ifeq ($(CONFIG_NET_ARP_ACD),y)
+CSRCS += netlib_checkifconflict.c
+endif
+
 include $(APPDIR)/Application.mk

netutils/netlib/netlib_checkifconflict.c

@@ -0,0 +1,103 @@
+/****************************************************************************
+ * apps/netutils/netlib/netlib_checkifconflict.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <debug.h>
+
+#include "netutils/netlib.h"
+
+#ifdef CONFIG_NET_ARP_ACD
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Determines the size of an intermediate buffer that must be large enough
+ * to handle the longest line generated by this logic.
+ */
+
+#define PROCFS_LINELEN   80
+#define PROCFS_NET_PATH "/proc/net/"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: netlib_check_ifconflict
+ *
+ * Description:
+ *   Check the network driver ip conflict
+ *
+ * Parameters:
+ *   ifname   The name of the interface to use
+ *
+ * Return:
+ *   0 on no conflict; a nagtive on failure; 1 on conflict
+ *
+ ****************************************************************************/
+
+int netlib_check_ifconflict(FAR const char *ifname)
+{
+  int conflict = 0;
+  char path[32];
+  char line[PROCFS_LINELEN];
+  FAR FILE *stream;
+
+  if (ifname == NULL)
+    {
+      fprintf(stderr, "ERROR: ifname is NULL \n");
+      return -EINVAL;
+    }
+
+  snprintf(path, sizeof(path), "%s%s", PROCFS_NET_PATH, ifname);
+  ninfo("get dev statistics from %s \n", path);
+
+  stream = fopen(path, "r");
+  if (stream == NULL)
+    {
+      fprintf(stderr, "ERROR: Failed to open path:%s \n", path);
+      return -errno;
+    }
+
+  while (fgets(line, sizeof(line), stream) != NULL)
+    {
+      if (strstr(line, "conflict!") != NULL)
+        {
+          conflict = 1;
+          break;
+        }
+    }
+
+  fclose(stream);
+  return conflict;
+}
+
+#endif /* CONFIG_NET_ARP_ACD */