From 945767f12154698fab3e7e370486a5e9b09276e9 Mon Sep 17 00:00:00 2001
From: John Denker <jsd@av8n.com>
Date: Thu, 19 Jul 2012 20:58:24 -0700
Subject: add "Scan" function to greylist

---
 tools/greylist.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++----------
 tools/makefile   |  3 ++
 2 files changed, 77 insertions(+), 15 deletions(-)

diff --git a/tools/greylist.c b/tools/greylist.c
index d769ff4..3ba502d 100644
--- a/tools/greylist.c
+++ b/tools/greylist.c
@@ -1,5 +1,6 @@
 #include <stdlib.h>             /* for exit(), getenv() */
 #include <iostream>
+#include <iomanip>
 #include <string>
 
 #include <sys/types.h>          /* for stat() */
@@ -11,8 +12,16 @@
 #include <fcntl.h>              /* for creat() */
 #include <sys/time.h>           /* for gettimeofday() */
 
+// requires apt-get install libboost-filesystem-dev:
+#include <boost/filesystem.hpp>
+
 using namespace std;
 
+const int minute(60);
+const int hour(60*minute);
+const int day(24*hour);
+
+const int minimum_age(5*minute);
 const int sa_good = 0;
 const int bug_bait_grey = 1;
 // qmail_queue and spamc have similar interpretations here:
@@ -30,27 +39,26 @@ void dump(const string var){
   else  cerr << " is not set." << endl;
 }
 
-const string dirname("/var/qmail/greylist");
 
    //       int stat(const char *path, struct stat *buf);
    //       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 dirname;
   string progname;
   pid_t mypid;
   timeval now;
+  string ipbase;
   string ipname;
+  string hostname;
   int mod_age;
   int ac_age;
 
-  whatsit(const string name)
-  : progname(name), mypid(getpid())
+  whatsit(const string name, const string _dirname)
+  : dirname(_dirname), progname(name), mypid(getpid()), mod_age(0), ac_age(0)
   {
     gettimeofday(&now, NULL);
   }
@@ -59,10 +67,49 @@ public:
   void update(const string msg, const timeval new_mod, const timeval new_ac);
 };
 
+void scan(const string p){
+  timeval now;
+  gettimeofday(&now, NULL);
+  using namespace boost::filesystem;
+
+  if (is_directory(p))  {
+    for (directory_iterator itr(p); itr!=directory_iterator(); ++itr) {
+      string basename = itr->path().filename();
+      cout << setw(20) << basename << ' '; // display filename only
+      if (is_regular_file(itr->status())) {
+//        cout << " [" << file_size(itr->path()) << ']';
+        struct stat mystat;
+        string fn = p + "/" + basename;
+        int rslt = stat(fn.c_str(), &mystat);
+        if (rslt != 0){
+            cerr << progname << ": stat failed for '"
+              << fn << "' : ";
+            perror(0);
+        }
+        int mod_age = now.tv_sec - mystat.st_mtime;
+        int ac_age = now.tv_sec - mystat.st_atime;
+        cout << setw(10) << mod_age
+                << " " << setw(10) << ac_age;
+        if (mod_age < minimum_age) {
+          cout << " young";
+        } else if (mod_age == ac_age) {
+          cout << " never used";
+        }
+      }
+      cout << '\n';
+    }
+  }
+  else {
+    // starting point is not a directory:
+    cout << (exists(p) ? "Found: " : "Not found: ") << p << '\n';
+  }
+}
+
 void whatsit::update(const string msg, const timeval new_mod, const timeval new_ac){
   cerr << progname << ": "
-       << msg << ": " << ipname
-          << "  mod_age: " << mod_age
+       << msg << ": " << ipbase;
+  if (hostname.length()) cerr <<  " " << hostname;
+  cerr << "  mod_age: " << mod_age
           << "  ac_age: " << ac_age
           << endl;
   timeval upd[2] = {
@@ -73,12 +120,22 @@ void whatsit::update(const string msg, const timeval new_mod, const timeval new_
   utimes(ipname.c_str(), upd);
 }
 
-int main(int argc, char** argv){
-
-//  dump("TCPREMOTEIP");
-//  dump("TCPREMOTEHOST");
+int main(int _argc, char** _argv){
+  int argc(_argc);
+  char** argv(_argv);
+  const string dirname("/var/qmail/greylist");
+  whatsit foo(argv[0], dirname); argc--; argv++;
+  while (argc > 0) {
+    string arg = argv[0]; argc--; argv++;
+    if (arg == "-scan") {
+      scan(dirname);
+      return 0;
+    }
+    else {
+      cerr << "Unrecognized arg, ignored: " << arg << endl;
+    }
+  }
 
-  whatsit foo(argv[0]);
   return foo.doit();
 }
 
@@ -88,7 +145,9 @@ int whatsit::doit(){
     cerr << progname << ": TCPREMOTEIP not set???" << endl;
     exit(sa_syserr);
   }
-  string ipbase = ipvar;
+  ipbase = ipvar;
+  char* hostvar = getenv("TCPREMOTEHOST");
+  if (hostvar) hostname = hostvar;
 
 // see if our directory exists:
   struct stat dirstat;
@@ -134,7 +193,7 @@ 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 < 5*minute) {
+  if (mod_age < minimum_age) {
     update("early bird", mod_orig, now);
     return(bug_bait_grey);
   }
diff --git a/tools/makefile b/tools/makefile
index 8837952..97c345c 100644
--- a/tools/makefile
+++ b/tools/makefile
@@ -14,6 +14,9 @@ progs = pido hi-q skrewt hi-test mail-scan greylist
 
 all: $(progs)
 
+greylist: greylist.c
+	$(CC) $< -lboost_filesystem-mt -o $@
+
 mail-scan: mail-scan.o
 	$(CC) $< -lboost_regex -o $@
 
-- 
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