nmap-0002 + haproxy-0004 + nginx-0004 + weechat-0003 + zeek-0002 + curl-0004: 6 new CWE-407 defects in network tools; count 693→699

nmap-0002:     nmap.cc merge_port_lists O(N²) port dedup → unordered_set O(N); ~65000x at max range
haproxy-0004:  http_ana.c http_capture_headers O(H×C) cap_hdr walk per request → pre-built HashMap O(H)
nginx-0004:    ngx_http_upstream_keepalive_module.c keepalive_get_peer O(C) sockaddr scan per upstream request → HashMap O(1)
weechat-0003:  irc-channel.c irc_channel_search O(C) linked-list scan per message handler → channels_hashtable O(1)
zeek-0002:     Attr.cc Attributes::AddAttrs O(A²) triple-Find/RemoveAttr per attr → unordered_map index O(A)
curl-0004:     mime.c search_header O(P×H) 3x per part per mime_add_headers → pre-indexed header name set O(P)

defects/haproxy/unit/HaproxyCaptureHeadersAlgorithmTest.java

@@ -0,0 +1,126 @@
+package unit;
+
+import java.util.*;
+
+/**
+ * haproxy-0004 — CWE-407: http_capture_headers O(H×C) per request
+ *
+ * Models http_ana.c http_capture_headers():
+ *   Slow: for each of H request headers, walk C-entry cap_hdr linked list (O(C))
+ *         → O(H × C) per request
+ *   Fast: pre-build HashMap<name,cap_hdr> at config time → O(H) per request
+ *
+ * Hot path: called on every HTTP request and response when `capture request header`
+ * directives are configured.
+ */
+public class HaproxyCaptureHeadersAlgorithmTest {
+
+    // Simulates a cap_hdr linked-list entry (from include/haproxy/capture-t.h)
+    static class CapHdr {
+        final String name;
+        final int index;
+        CapHdr next;
+        CapHdr(String name, int index) { this.name = name; this.index = index; }
+    }
+
+    // Simulates an HTTP header (name + value)
+    static class HttpHeader {
+        final String name;
+        final String value;
+        HttpHeader(String name, String value) { this.name = name; this.value = value; }
+    }
+
+    // --- SLOW: O(H × C) per request (defect) ---
+    // Models: for each htx header → for each cap_hdr → strncasecmp
+    static long captureHeadersSlow(List<HttpHeader> headers, CapHdr capHdrHead) {
+        long ops = 0;
+        String[] cap = new String[64];
+
+        for (HttpHeader hdr : headers) {
+            for (CapHdr h = capHdrHead; h != null; h = h.next) {
+                ops++;  // strncasecmp call
+                if (h.name.equalsIgnoreCase(hdr.name)) {
+                    if (cap[h.index] == null)
+                        cap[h.index] = hdr.value;
+                }
+            }
+        }
+        return ops;
+    }
+
+    // --- FAST: O(H) per request (fix) ---
+    // Models: pre-built HashMap<lowercaseName, cap_hdr> at config time
+    static long captureHeadersFast(List<HttpHeader> headers,
+                                   Map<String, CapHdr> capHdrMap) {
+        long ops = 0;
+        String[] cap = new String[64];
+
+        for (HttpHeader hdr : headers) {
+            ops++;  // O(1) hash lookup
+            CapHdr h = capHdrMap.get(hdr.name.toLowerCase());
+            if (h != null && cap[h.index] == null)
+                cap[h.index] = hdr.value;
+        }
+        return ops;
+    }
+
+    // Build cap_hdr linked list
+    static CapHdr buildCapHdrList(int count) {
+        CapHdr head = null;
+        for (int i = count - 1; i >= 0; i--) {
+            CapHdr h = new CapHdr("X-Custom-Header-" + i, i);
+            h.next = head;
+            head = h;
+        }
+        return head;
+    }
+
+    // Build pre-indexed cap_hdr map
+    static Map<String, CapHdr> buildCapHdrMap(CapHdr head) {
+        Map<String, CapHdr> map = new HashMap<>();
+        for (CapHdr h = head; h != null; h = h.next)
+            map.put(h.name.toLowerCase(), h);
+        return map;
+    }
+
+    // Build HTTP request headers list
+    static List<HttpHeader> buildHeaders(int count, int captureHits) {
+        List<HttpHeader> headers = new ArrayList<>();
+        for (int i = 0; i < count; i++) {
+            String name;
+            if (i < captureHits)
+                name = "X-Custom-Header-" + i;  // will match cap_hdr
+            else
+                name = "Standard-Header-" + i;  // won't match cap_hdr
+            headers.add(new HttpHeader(name, "value-" + i));
+        }
+        return headers;
+    }
+
+    public static void main(String[] args) {
+        System.out.println("haproxy-0004 CWE-407: http_capture_headers O(H*C) vs O(H)");
+        System.out.println("==========================================================");
+
+        // Parameters: H request headers, C capture headers configured
+        int[][] params = { {30, 10}, {50, 20}, {100, 50} };
+
+        for (int[] p : params) {
+            int H = p[0], C = p[1];
+            CapHdr capHdrHead = buildCapHdrList(C);
+            Map<String, CapHdr> capHdrMap = buildCapHdrMap(capHdrHead);
+            List<HttpHeader> headers = buildHeaders(H, C / 2);
+
+            long slowOps = captureHeadersSlow(headers, capHdrHead);
+            long fastOps = captureHeadersFast(headers, capHdrMap);
+            double ratio = (double) slowOps / fastOps;
+
+            System.out.printf("  H=%3d headers, C=%2d captures: slow=%,5d ops  fast=%,3d ops  speedup=%.0fx%n",
+                    H, C, slowOps, fastOps, ratio);
+
+            assert ratio >= (double) C / 2 :
+                "Expected speedup >= " + (C/2) + "x but got " + ratio;
+        }
+
+        System.out.println("\nPASS");
+    }
+}