From 5d8d6c4de1940413f42e7b1c913db4b233606146 Mon Sep 17 00:00:00 2001
From: John Denker <jsd@av8n.com>
Date: Fri, 20 Jul 2012 12:50:55 -0700
Subject: builing some features to penalize spammers, by pushing the
 greylisting barrier into the future

---
 tools/greylist.c | 51 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 37 insertions(+), 14 deletions(-)

(limited to 'tools')

diff --git a/tools/greylist.c b/tools/greylist.c
index 1320257..00272d8 100644
--- a/tools/greylist.c
+++ b/tools/greylist.c
@@ -95,17 +95,20 @@ public:
   {
     gettimeofday(&now, NULL);
   }
-  int doit();
+  int doit(const int penalty=0);
 // access comes after modification:
-  void update(const string msg, const timeval new_mod, const timeval new_ac);
+  void update(const string msg, const timeval new_mod,
+        const timeval new_ac, const int penalty=0);
 };
 
-string time_out(const int ttt){
+string time_out(const int _ttt){
+  int ttt(abs(_ttt));
   int sec(ttt % 60);
   int min((ttt / 60) % 60);
   int hr(ttt / 3600);
   stringstream foo;
   int didsome(0);
+  if (_ttt < 0) foo << "-";
   if (hr) {
     foo << hr << ":";
     didsome++;
@@ -142,7 +145,10 @@ void scan(const string p, const int copies=1){
         int ac_age = now.tv_sec - mystat.st_atime;
         cout << setw(10) << time_out(mod_age)
                 << " " << setw(10) << time_out(ac_age);
-        if (mod_age - ac_age < minimum_age    // early bird, or completely unused
+        if (mod_age < 0) {
+          cout << " penalty";
+        }
+        else if (mod_age - ac_age < minimum_age    // early bird, or completely unused
           && mod_age > probation) {           // did not diligently resubmit
           cout << " disprobation";
           if (mod_age != ac_age) cout << "!";
@@ -165,17 +171,23 @@ void scan(const string p, const int copies=1){
   }
 }
 
-void whatsit::update(const string msg, const timeval new_mod, const timeval new_ac){
+void whatsit::update(const string msg, const timeval new_mod,
+     const timeval new_ac, const int penalty){
   cerr << progname << ": "
        << msg << ": " << ipbase;
   if (hostname.length()) cerr <<  " " << hostname;
   cerr << "  mod_age: " << time_out(mod_age)
           << "  ac_age: " << time_out(ac_age)
           << endl;
+  timeval pen_mod(new_mod);
+  if (penalty) {
+    pen_mod = now;
+    pen_mod.tv_sec += penalty;    
+  }
   timeval upd[2] = {
 // beware:  access illogically comes *before* modification here:
     new_ac,
-    new_mod
+    pen_mod
   };
   utimes(ipname.c_str(), upd);
 }
@@ -187,12 +199,19 @@ int main(int _argc, char** _argv){
   whatsit foo(argv[0], dirname); argc--; argv++;
   int scanmode(0);
   int copies(1);
+  int penalty(0);
   while (argc > 0) {
     string arg = argv[0]; argc--; argv++;
-    if (arg == "-scan") {
+    if (prefix(arg, "-scan")) {
       scanmode++;
-    } else if (arg == "-copy")  {
+    } else if (prefix(arg, "-copy"))  {
       copies++;
+    } else if (prefix(arg, "-penalize"))  {
+      if (!argc){
+        cerr << "Option '" << arg << "' requires an argument" << endl;
+        exeunt(ex_syserr);
+      }
+      penalty = atoi(*argv++);  argc--;
     } else {
       cerr << "Unrecognized arg: " << arg << endl;
       exeunt(ex_syserr);
@@ -203,10 +222,10 @@ int main(int _argc, char** _argv){
     return 0;
   }
 
-  return foo.doit();
+  return foo.doit(penalty);
 }
 
-int whatsit::doit(){
+int whatsit::doit(const int penalty){
   char* ipvar = getenv("TCPREMOTEIP");
   if (!ipvar) {
     cerr << progname << ": TCPREMOTEIP not set???" << endl;
@@ -266,20 +285,24 @@ int whatsit::doit(){
   mod_age = now.tv_sec - ipstat.st_mtime;
   ac_age = now.tv_sec - ipstat.st_atime;
   timeval mod_orig = {ipstat.st_mtime, 0};
+  if (mod_age < 0) {
+    update("penalty box", mod_orig, now, penalty);
+    exeunt(ex_spam);
+  }
   if (mod_age < minimum_age) {
-    update("early bird", mod_orig, now);
+    update("early bird", mod_orig, now, penalty);
     exeunt(ex_greylisting);
   }
   if (mod_age - ac_age < minimum_age    // early bird, or completely unused
     && mod_age > probation) {           // did not diligently resubmit
-    update("disprobation", now, now);
+    update("disprobation", now, now, penalty);
     exeunt(ex_greylisting);
   }
   if (ac_age > maximum_age) {
-    update("too old, starting over", now, now);
+    update("too old, starting over", now, now, penalty);
     exeunt(ex_greylisting);
   }
 // if all checks are passed, must be OK:
-  update("returning customer", mod_orig, now);
+  update("returning customer", mod_orig, now, penalty);
   return 0;
 }
-- 
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