feat: add support for multi-octet and dash-based IP ranges

cidr.go

@@ -256,9 +256,9 @@ func nextSubnet(network *net.IPNet, prefixLen int) (*net.IPNet, error) {
 // specific check.
 //
 // nolint:all
-func isPowerOfTwoPlusOne(x int) bool {
-	return isPowerOfTwo(x - 1)
-}
+// func isPowerOfTwoPlusOne(x int) bool {
+// 	return isPowerOfTwo(x - 1)
+// }
 
 // isPowerOfTwo returns if a number is a power of 2
 func isPowerOfTwo(x int) bool {
@@ -268,11 +268,11 @@ func isPowerOfTwo(x int) bool {
 // reverseIPNet reverses an ipnet slice
 //
 // nolint:all
-func reverseIPNet(ipnets []*net.IPNet) {
-	for i, j := 0, len(ipnets)-1; i < j; i, j = i+1, j-1 {
-		ipnets[i], ipnets[j] = ipnets[j], ipnets[i]
-	}
-}
+// func reverseIPNet(ipnets []*net.IPNet) {
+// 	for i, j := 0, len(ipnets)-1; i < j; i, j = i+1, j-1 {
+// 		ipnets[i], ipnets[j] = ipnets[j], ipnets[i]
+// 	}
+// }
 
 // IPAddresses returns all the IP addresses in a CIDR
 func IPAddresses(cidr string) ([]string, error) {

cmd/mapcidr/main.go

@@ -419,8 +419,28 @@ func process(wg *sync.WaitGroup, chancidr, outputchan chan string) {
 		}
 
 		for _, cidr := range cidrsToProcess {
-			// Add IPs into ipRangeList which are passed as input. Example - "192.168.0.0-192.168.0.5"
+
 			if strings.Contains(cidr, "-") {
+				// Try to parse as multi-octet range
+				if strings.Count(cidr, ".") == 3 {
+					ips, err := mapcidr.ExpandIPPattern(cidr)
+					if err != nil {
+						gologger.Fatal().Msgf("%s\n", err)
+					}
+
+					for _, ip := range ips {
+						ipCidr := ip.String() + "/32"
+						if options.Aggregate || options.Shuffle || hasSort || options.AggregateApprox || options.Count {
+							_, ipnet, _ := net.ParseCIDR(ipCidr)
+							allCidrs = append(allCidrs, ipnet)
+						} else {
+							commonFunc(ipCidr, outputchan)
+						}
+					}
+					continue
+				}
+
+				// Add IPs into ipRangeList which are passed as input. Example - "192.168.0.0-192.168.0.5"
 				var ipRange []net.IP
 				for _, ipstr := range strings.Split(cidr, "-") {
 					ipRange = append(ipRange, net.ParseIP(ipstr))
@@ -452,8 +472,8 @@ func process(wg *sync.WaitGroup, chancidr, outputchan chan string) {
 				continue
 			}
 
+			// In case of coalesce/shuffle we need to know all the cidrs and aggregate them by calling the proper function
 			if options.Aggregate || options.Shuffle || hasSort || options.AggregateApprox || options.Count {
-				// In case of coalesce/shuffle we need to know all the cidrs and aggregate them by calling the proper function
 				_ = ranger.Add(cidr)
 				allCidrs = append(allCidrs, pCidr)
 			} else {

cmd/mapcidr/main_test.go

@@ -230,6 +230,67 @@ func TestProcess(t *testing.T) {
 				Aggregate: true,
 			},
 			expectedOutput: []string{"10.0.0.0/32", "10.0.0.2/31"},
+		}, {
+			name:       "MultiOctetRangeExpansion",
+			chancidr:   make(chan string),
+			outputchan: make(chan string),
+			options: Options{
+				FileCidr: []string{"192.168.0-1.1-2"},
+			},
+			expectedOutput: []string{
+				"192.168.0.1", "192.168.0.2",
+				"192.168.1.1", "192.168.1.2",
+			},
+		},
+		{
+			name:       "MultiOctetRangeWithFilter",
+			chancidr:   make(chan string),
+			outputchan: make(chan string),
+			options: Options{
+				FileCidr: []string{"192.168.0-1.1-2"},
+				FilterIP: []string{"192.168.1.1"},
+			},
+			expectedOutput: []string{
+				"192.168.0.1", "192.168.0.2",
+				"192.168.1.2",
+			},
+		},
+		{
+			name:       "MultiOctetRangeAggregate",
+			chancidr:   make(chan string),
+			outputchan: make(chan string),
+			options: Options{
+				FileCidr:  []string{"10.0-1.0-1.0-1"},
+				Aggregate: true,
+			},
+			expectedOutput: []string{
+				"10.0.0.0/31", "10.0.1.0/31",
+				"10.1.0.0/31", "10.1.1.0/31",
+			},
+		},
+		{
+			name:       "MultiOctetRangeSortAscending",
+			chancidr:   make(chan string),
+			outputchan: make(chan string),
+			options: Options{
+				FileCidr:      []string{"10.0.0-0.2-3"},
+				SortAscending: true,
+			},
+			expectedOutput: []string{
+				"10.0.0.2", "10.0.0.3",
+			},
+		},
+		{
+			name:       "MultiOctetRangeSortDescending",
+			chancidr:   make(chan string),
+			outputchan: make(chan string),
+			options: Options{
+				FileCidr:       []string{"10.0.1-2.1"},
+				SortDescending: true,
+			},
+			expectedOutput: []string{
+				"10.0.2.1", "10.0.1.1",
+			},
 		},
 	}
 	var wg sync.WaitGroup

ip.go

@@ -1209,3 +1209,71 @@ func IpRangeToCIDR(start, end string) ([]string, error) {
 	}
 	return cidr, nil
 }
+
+/*
+ExpandIPPattern expands an IPv4 pattern string into a list of net.IP addresses.
+The pattern must be in the form of four octets separated by dots (a.b.c.d).
+*/
+func ExpandIPPattern(pattern string) ([]net.IP, error) {
+	parts := strings.Split(pattern, ".")
+	if len(parts) != 4 {
+		return nil, fmt.Errorf("invalid IP pattern: %s", pattern)
+	}
+
+	var octets [][]int
+	for _, part := range parts {
+		if strings.Contains(part, "-") {
+			bounds := strings.Split(part, "-")
+			if len(bounds) != 2 {
+				return nil, fmt.Errorf("invalid range in %s", part)
+			}
+
+			start, err1 := strconv.Atoi(bounds[0])
+			end, err2 := strconv.Atoi(bounds[1])
+
+			if err1 != nil || err2 != nil || start > end {
+				return nil, fmt.Errorf("invalid range: %s", part)
+			}
+
+			var nums []int
+			for i := start; i <= end; i++ {
+				nums = append(nums, i)
+			}
+			octets = append(octets, nums)
+
+		} else {
+			v, err := strconv.Atoi(part)
+			if err != nil {
+				return nil, fmt.Errorf("invalid octet: %s", part)
+			}
+
+			octets = append(octets, []int{v})
+		}
+	}
+
+	var ips []net.IP
+	for _, o1 := range octets[0] {
+		if o1 < 0 || o1 > 255 {
+			return nil, fmt.Errorf("invalid octet value: %d", o1)
+		}
+		for _, o2 := range octets[1] {
+			if o2 < 0 || o2 > 255 {
+				return nil, fmt.Errorf("invalid octet value: %d", o2)
+			}
+			for _, o3 := range octets[2] {
+				if o3 < 0 || o3 > 255 {
+					return nil, fmt.Errorf("invalid octet value: %d", o3)
+				}
+				for _, o4 := range octets[3] {
+					if o4 < 0 || o4 > 255 {
+						return nil, fmt.Errorf("invalid octet value: %d", o4)
+					}
+					ip := net.IPv4(byte(o1), byte(o2), byte(o3), byte(o4))
+					ips = append(ips, ip)
+				}
+			}
+		}
+	}
+
+	return ips, nil
+}