random-qmqpc.patch

From austad@marketwatch.com Tue Nov 06 05:48:02 2001
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	["2105" "Mon" "5" "November" "2001" "23:46:37" "-0600" "Austad, Jay" "austad@marketwatch.com" nil "91" "RE: Patch for qmail-qmqpc" "^From:" nil nil "11" nil nil nil nil nil]
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From: "Austad, Jay" <austad@marketwatch.com>
To: 'Russell Nelson' <nelson@crynwr.com>
Subject: RE: Patch for qmail-qmqpc
Date: Mon, 5 Nov 2001 23:46:37 -0600 

Here you go:

####################################################################
# This patch makes qmail-qmqpc randomly choose servers from your
# /var/qmail/control/qmqpservers file instead of picking the first
# available server.  It can handle 255 servers, but is easily 
# modified to support more.
# 
# Patch by Jay Austad - austad@marketwatch.com
# Usage: put this file in your qmail directory and do:
# patch <qmail-qmqpc-randomLB-0.1.patch
####################################################################
--- qmail-qmqpc.c.orig	Mon Jul 24 10:50:23 2000
+++ qmail-qmqpc.c	Mon Nov  5 23:33:51 2001
@@ -1,7 +1,11 @@
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <stddef.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/timeb.h>
 #include "substdio.h"
 #include "getln.h"
 #include "readwrite.h"
@@ -62,6 +66,12 @@
 char strnum[FMT_ULONG];
 stralloc line = {0};
 
+struct sindex
+{
+		int pos[256];
+		int len;
+};
+
 void getmess()
 {
   int match;
@@ -139,21 +149,38 @@
 {
   int i;
   int j;
-
+  int randj;
+  int randarr[256];
+  struct timeb tp;
+  struct sindex serverindex;
+  
   sig_pipeignore();
-
   if (chdir(auto_qmail) == -1) die_home();
   if (control_init() == -1) die_control();
   if (control_readfile(&servers,"control/qmqpservers",0) != 1) die_control();
-
   getmess();
-
-  i = 0;
-  for (j = 0;j < servers.len;++j)
-    if (!servers.s[j]) {
-      doit(servers.s + i);
-      i = j + 1;
-    }
+  serverindex.len = 1;
+  serverindex.pos[0]=0;
+  for (j = 0; j < servers.len; j++)
+  {
+		  if (servers.s[j] == NULL) {
+				  serverindex.pos[serverindex.len] = j+1;
+				  serverindex.len++;
+		  }
+  }
+  serverindex.len--;
+  ftime(&tp);
+  srand(tp.millitm);
+  randj = (serverindex.len*1.0)*rand()/(RAND_MAX+1.0);
+
+byte_copy(randarr, 4 * (serverindex.len - randj), serverindex.pos + randj);
+byte_copy(randarr + (serverindex.len-randj), (randj) * 4, serverindex.pos);
+
+for (j=0; j < serverindex.len; j++)
+  {
+	  doit(servers.s + randarr[j]);
+  }
+						  
 
   _exit(lasterror);
 }