From 8a896e9b2bce51742d264f6a23c4cce544ec5af7 Mon Sep 17 00:00:00 2001
From: John Denker <jsd@av8n.com>
Date: Thu, 19 Jul 2012 18:55:57 -0700
Subject: might even be working : greylist

---
 tools/greylist.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 66 insertions(+), 9 deletions(-)

(limited to 'tools')

diff --git a/tools/greylist.c b/tools/greylist.c
index 8adac05..d769ff4 100644
--- a/tools/greylist.c
+++ b/tools/greylist.c
@@ -9,6 +9,8 @@
 #include <errno.h>              /* for ENOENT */
 #include <fstream>              /* for ofstream() */
 #include <fcntl.h>              /* for creat() */
+#include <sys/time.h>           /* for gettimeofday() */
+
 using namespace std;
 
 const int sa_good = 0;
@@ -21,7 +23,7 @@ string progname;
 
 void dump(const string var){
   char* str = getenv(var.c_str());
-  cerr << progname 
+  cerr << progname
     << "[" << mypid << "] "
     << var;
   if (str) cerr << " is set to '" << str << "'" << endl;
@@ -34,12 +36,53 @@ const string dirname("/var/qmail/greylist");
    //       int fstat(int fd, struct stat *buf);
    //       int lstat(const char *path, struct stat *buf);
 
+const int minute(60);
+const int hour(60*minute);
+const int day(24*hour);
+
+class whatsit{
+public:
+  string progname;
+  pid_t mypid;
+  timeval now;
+  string ipname;
+  int mod_age;
+  int ac_age;
+
+  whatsit(const string name)
+  : progname(name), mypid(getpid())
+  {
+    gettimeofday(&now, NULL);
+  }
+  int doit();
+// access comes after modification:
+  void 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){
+  cerr << progname << ": "
+       << msg << ": " << ipname
+          << "  mod_age: " << mod_age
+          << "  ac_age: " << ac_age
+          << endl;
+  timeval upd[2] = {
+// beware:  access illogically comes *before* modification here:
+    new_ac,
+    new_mod
+  };
+  utimes(ipname.c_str(), upd);
+}
+
 int main(int argc, char** argv){
-  mypid = getpid();
-  progname = argv[0];
+
 //  dump("TCPREMOTEIP");
 //  dump("TCPREMOTEHOST");
 
+  whatsit foo(argv[0]);
+  return foo.doit();
+}
+
+int whatsit::doit(){
   char* ipvar = getenv("TCPREMOTEIP");
   if (!ipvar) {
     cerr << progname << ": TCPREMOTEIP not set???" << endl;
@@ -66,8 +109,8 @@ int main(int argc, char** argv){
       exit(sa_syserr);
     }
   }
-  
-  string ipname = dirname + "/" + ipbase;
+
+  ipname = dirname + "/" + ipbase;
   struct stat ipstat;
   rslt = stat(ipname.c_str(), &ipstat);
   if (rslt != 0){
@@ -84,9 +127,23 @@ int main(int argc, char** argv){
       perror(0);
     }
     close(fd);
+    update("new customer", now, now);
     return(bug_bait_grey);
-  } else {
-    cerr <<  "file exists: " << ipname << endl;
   }
-  return 0;
-}
+// here if stat succeeded
+  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 < 5*minute) {
+    update("early bird", mod_orig, now);
+    return(bug_bait_grey);
+  }
+  if (ac_age < 32*day) {
+    update("returning customer", mod_orig, now);
+    return 0;
+  }
+
+// here if it is too old:
+  update("too old, starting over", now, now);
+  return(bug_bait_grey);
+}
\ No newline at end of file
-- 
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