From d591675eb6c4d228ed1571144b792bc9bc95f14d Mon Sep 17 00:00:00 2001
From: Georg Hopp <georg@steffers.org>
Date: Mon, 17 Mar 2014 10:55:27 +0000
Subject: [PATCH] add interface netmask and network

---
 gatherer/interface_information.sh | 89 +++++++++++++++++++++++--------
 run.sh                            |  2 +
 2 files changed, 70 insertions(+), 21 deletions(-)

diff --git a/gatherer/interface_information.sh b/gatherer/interface_information.sh
index 8f2bace..5b872f6 100644
--- a/gatherer/interface_information.sh
+++ b/gatherer/interface_information.sh
@@ -36,7 +36,7 @@ gather_interface_info() {
 gather_if_info_ip() {
 	eval $(${IP} -o link | ${AWK} '{
 		sub(/:/,"",$1);
-		no=$1;
+		ifno=$1;
 		sub(/:/,"",$2);
 		name=$2;
 		classes=classes "net_iface_" name " ";
@@ -50,35 +50,82 @@ gather_if_info_ip() {
 			}
 		}
 		print "IF" no "_NAME=" name ";IF" no "_STATE=" state ";IF" no "_MAC=" mac ";";
-		if ("UP" == state) classes=classes mac " "
+		if ("UP" == state) classes=classes mac " ";
+		if_numbers=if_numbers " " ifno;
+		no+=1
 	}
 	BEGIN {
-		classes=""
+		classes="";
+		no=1;
+		if_numbers=""
 	}
 	END {
 		print "set_class " classes ";";
 		print "NINTERFACES=" FNR ";"
+		sub(/^ */,"",if_numbers);
+		sub(/ *$/,"",if_numbers);
+		print "IF_NUMBERS=\"" if_numbers "\";";
 	}')
 
-	eval $(${IP} -o addr | ${AWK} '{
-		sub(/:/,"",$1);
-		no=$1;
-		if ($3 == "inet") {
-			sub(/[\/%].*/,"",$4);
-			print "IF" no "_IPV4=\"${IF" no "_IPV4}" $4 " \";";
-			classes=classes $4 " "
-		}
-		if ($3 == "inet6") {
-			sub(/[\/%].*/,"",$4);
-			print "IF" no "_IPV6=\"${IF" no "_IPV6}" $4 " \";";
-			classes=classes $4 " "
+	echo "DEBUG: ${IF_NO}"
+
+	eval $(${IP} -o addr | ${AWK} -v if_numbers="${IF_NUMBERS}" '{
+        sub(/:/,"",$1);
+        if_no=$1;
+		no=r_if_numbers[if_no];
+        if ($3 == "inet") {
+            split($4,addr,/[\/]/);
+            print "IF" no "_IPV4=\"${IF" no "_IPV4}" addr[1] " \";";
+			network(no, addr[1], addr[2]);
+            classes=classes $4 " "
+        }
+        if ($3 == "inet6") {
+            split($4,addr,/[\/]/);
+            print "IF" no "_IPV6=\"${IF" no "_IPV6}" addr[1] " \";";
+            classes=classes $4 " "
+        }
+    }
+    BEGIN {
+        classes="";
+		sub(/^ */,"",if_numbers);
+		sub(/ *$/,"",if_numbers);
+		split(if_numbers,tmp_array,/ /)
+		for(no in tmp_array) {
+			if_no=tmp_array[no];
+			r_if_numbers[if_no]=no;
 		}
-	}
-	BEGIN {
-		classes=""
-	}
-	END {
-		print "set_class " classes ";"
+    }
+    END {
+        print "set_class " classes ";"
+    }
+    function network(no, addr, cidr) {
+        mask="";
+        net="";
+        full_octets=cidr/8;
+        part_octets=cidr%8;
+        split(addr,parts,/\./);
+        for(i=1; i<5; i++) {
+            if(i-1 < full_octets) {
+                mask=mask "255";
+                net=net parts[i];
+            } else {
+                if (i-1 == full_octets) {
+                    mpart=256-lshift(1, 8-part_octets);
+                    mask=mask mpart;
+		    net=net and(parts[i],mpart);
+                } else {
+                    mask=mask "0";
+                    net=net "0";
+                }
+            }
+            if (i < 4) {
+                mask=mask ".";
+                net=net ".";
+            }
+        }
+		classes=classes " " net;
+        print "IF" no "_NETWORK=\"" net "\"; export " name "_NETWORK;";
+        print "IF" no "_MASK=\"" mask "\"; export " name "_MASK;";
 	}')
 }
 
diff --git a/run.sh b/run.sh
index ba51783..c37888b 100755
--- a/run.sh
+++ b/run.sh
@@ -40,6 +40,8 @@ do
 	eval printf \"%15s : %s\\\n\" \"IF${NO}_STATE\" \"\${IF${NO}_STATE}\"
 	eval printf \"%15s : %s\\\n\" \"IF${NO}_IPV4\" \"\${IF${NO}_IPV4}\"
 	eval printf \"%15s : %s\\\n\" \"IF${NO}_IPV6\" \"\${IF${NO}_IPV6}\"
+	eval printf \"%15s : %s\\\n\" \"IF${NO}_MASK\" \"\${IF${NO}_MASK}\"
+	eval printf \"%15s : %s\\\n\" \"IF${NO}_NETWORK\" \"\${IF${NO}_NETWORK}\"
 	NO=$((NO+1))
 done