netlink monitoring aded

wireless querying improved


git-svn-id: file:///home/lennart/svn/public/ifplugd/trunk@30 2bf48fe7-cfc1-0310-909f-d9042e1e0fef

1 files changed, 76 insertions, 0 deletions

diff --git a/src/ifmonitor.c b/src/ifmonitor.c
new file mode 100644
index 0000000..d49160b
--- /dev/null
+++ b/src/ifmonitor.c
@@ -0,0 +1,76 @@
+/* $Id: ifplugd.c 1.12 Sat, 01 Feb 2003 03:00:07 +0100 lennart $ */
+
+/*
+ * This file is part of ifplugd.
+ *
+ * ifplugd is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * ifplugd is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ifplugd; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <sys/socket.h>
+#include <linux/types.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/if.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "nlapi.h"
+
+static int callback(struct nlmsghdr *n, void *u) {
+    int (*cb)(int b, int index, unsigned short type, const char *name) = u;
+    
+    if (n->nlmsg_type == RTM_NEWLINK || n->nlmsg_type == RTM_DELLINK) {
+        struct rtattr *a;
+        struct ifinfomsg *i;
+        char ifname[IFNAMSIZ+1];
+        int la;
+        
+        i = NLMSG_DATA(n);
+        
+        if (n->nlmsg_len < NLMSG_LENGTH(sizeof(struct ifinfomsg))) {
+            fprintf(stderr, "NETLINK: Packet too small or truncated! (2)\n");
+            return -1;
+        }
+
+        memset(&ifname, 0, sizeof(ifname));
+        
+        a = (void*) i + NLMSG_ALIGN(sizeof(struct ifinfomsg));
+        la = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
+                
+        while (RTA_OK(a, la)) {
+            
+            if(a->rta_type == IFLA_IFNAME) {
+                int l = RTA_PAYLOAD(a);
+                if (l > IFNAMSIZ)
+                    l = IFNAMSIZ;
+                strncpy(ifname, RTA_DATA(a), l);
+            }
+                        
+            a = RTA_NEXT(a, la);
+        }
+
+        if (cb(n->nlmsg_type == RTM_NEWLINK, i->ifi_index, i->ifi_type, ifname[0] ? ifname : NULL) < 0)
+            return -1;
+    }
+
+    
+    return 0;
+}
+
+int ifmonitor_init(int (*cb) (int b, int index, unsigned short type, const char *name)) {
+    return nlapi_register(callback, cb);
+}