PIMD: Fix code to use srandom/random

pimd rolled it's own solution to random #'s, that was not
terribly random.  Rely on the underlying system to generate
random #'s for us

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

pimd/Makefile.am

@@ -52,7 +52,7 @@ libpim_a_SOURCES = \
 	pim_igmpv3.c pim_str.c pim_mroute.c pim_util.c pim_time.c \
 	pim_oil.c pim_zlookup.c pim_pim.c pim_tlv.c pim_neighbor.c \
 	pim_hello.c pim_ifchannel.c pim_join.c pim_assert.c \
-	pim_msg.c pim_upstream.c pim_rpf.c pim_rand.c pim_macro.c \
+	pim_msg.c pim_upstream.c pim_rpf.c pim_macro.c \
 	pim_igmp_join.c pim_ssmpingd.c pim_int.c
 
 noinst_HEADERS = \
@@ -61,7 +61,7 @@ noinst_HEADERS = \
 	pim_igmpv3.h pim_str.h pim_mroute.h pim_util.h pim_time.h \
 	pim_oil.h pim_zlookup.h pim_pim.h pim_tlv.h pim_neighbor.h \
 	pim_hello.h pim_ifchannel.h pim_join.h pim_assert.h \
-	pim_msg.h pim_upstream.h pim_rpf.h pim_rand.h pim_macro.h \
+	pim_msg.h pim_upstream.h pim_rpf.h pim_macro.h \
 	pim_igmp_join.h pim_ssmpingd.h pim_int.h
 
 pimd_SOURCES = \

pimd/pim_iface.c

@@ -36,7 +36,6 @@
 #include "pim_pim.h"
 #include "pim_neighbor.h"
 #include "pim_ifchannel.h"
-#include "pim_rand.h"
 #include "pim_sock.h"
 #include "pim_time.h"
 #include "pim_ssmpingd.h"
@@ -839,7 +838,7 @@ int pim_if_t_override_msec(struct interface *ifp)
   effective_override_interval_msec =
     pim_if_effective_override_interval_msec(ifp);
 
-  t_override_msec = pim_rand_next(0, effective_override_interval_msec);
+  t_override_msec = random() % (effective_override_interval_msec + 1);
 
   return t_override_msec;
 }
@@ -902,6 +901,7 @@ long pim_if_t_suppressed_msec(struct interface *ifp)
 {
   struct pim_interface *pim_ifp;
   long t_suppressed_msec;
+  uint32_t ramount = 0;
 
   pim_ifp = ifp->info;
   zassert(pim_ifp);
@@ -911,8 +911,8 @@ long pim_if_t_suppressed_msec(struct interface *ifp)
     return 0;
 
   /* t_suppressed = t_periodic * rand(1.1, 1.4) */
-
-  t_suppressed_msec = qpim_t_periodic * pim_rand_next(1100, 1400);
+  ramount = 1100 + (random() % (1400 - 1100 + 1));
+  t_suppressed_msec = qpim_t_periodic * ramount;
 
   return t_suppressed_msec;
 }

pimd/pim_pim.c

@@ -39,7 +39,6 @@
 #include "pim_join.h"
 #include "pim_assert.h"
 #include "pim_msg.h"
-#include "pim_rand.h"
 
 static int on_pim_hello_send(struct thread *t);
 static int pim_hello_send(struct interface *ifp,
@@ -686,7 +685,7 @@ void pim_hello_restart_triggered(struct interface *ifp)
   }
   zassert(!pim_ifp->t_pim_hello_timer);
 
-  random_msec = pim_rand_next(0, triggered_hello_delay_msec);
+  random_msec = random() % (triggered_hello_delay_msec + 1);
 
   if (PIM_DEBUG_PIM_EVENTS) {
     zlog_debug("Scheduling %d msec triggered hello on interface %s",
@@ -724,7 +723,7 @@ int pim_sock_add(struct interface *ifp)
   pim_ifp->t_pim_sock_read   = 0;
   pim_ifp->pim_sock_creation = pim_time_monotonic_sec();
 
-  pim_ifp->pim_generation_id = pim_rand() & (int64_t) 0xFFFFFFFF;
+  pim_ifp->pim_generation_id = random();
 
   zlog_info("PIM INTERFACE UP: on interface %s ifindex=%d",
 	    ifp->name, ifp->ifindex);

pimd/pim_rand.c

@@ -1,60 +0,0 @@
-/*
-  PIM for Quagga
-  Copyright (C) 2008  Everton da Silva Marques
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-  
-  You should have received a copy of the GNU General Public License
-  along with this program; see the file COPYING; if not, write to the
-  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
-  MA 02110-1301 USA
-  
-  $QuaggaId: $Format:%an, %ai, %h$ $
-*/
-
-#include "pim_rand.h"
-#include "pim_time.h"
-
-/* Quick and dirty random number generator from NUMERICAL RECIPES IN C:
-   THE ART OF SCIENTIFIC COMPUTING (ISBN 0-521-43108-5). */
-/* BEWARE: '_qseed_' is assigned! */
-#define QRANDOM(_qseed_)  ((_qseed_) = (((_qseed_) * 1664525L) + 1013904223L))
-
-static long qpim_rand_seed;
-
-void pim_rand_init()
-{
-  qpim_rand_seed = pim_time_monotonic_sec() ^ getpid();
-}
-
-long pim_rand()
-{
-  return QRANDOM(qpim_rand_seed);
-}
-
-int pim_rand_next(int min, int max)
-{
-  long rand;
-
-  assert(min <= max);
-
-  /* FIXME better random generator ? */
-
-  rand = QRANDOM(qpim_rand_seed); 
-  if (rand < 0)
-    rand = -rand;
-  rand = rand % (1 + max - min) + min;
-
-  assert(rand >= min);
-  assert(rand <= max);
-
-  return rand;
-}

pimd/pim_rand.h

@@ -1,30 +0,0 @@
-/*
-  PIM for Quagga
-  Copyright (C) 2008  Everton da Silva Marques
-
-  This program is free software; you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
-  (at your option) any later version.
-
-  This program is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  General Public License for more details.
-  
-  You should have received a copy of the GNU General Public License
-  along with this program; see the file COPYING; if not, write to the
-  Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
-  MA 02110-1301 USA
-  
-  $QuaggaId: $Format:%an, %ai, %h$ $
-*/
-
-#ifndef PIM_RAND_H
-#define PIM_RAND_H
-
-void pim_rand_init(void);
-long pim_rand(void);
-int pim_rand_next(int min, int max);
-
-#endif /* PIM_RAND_H */

pimd/pimd.c

@@ -34,7 +34,6 @@
 #include "pim_oil.h"
 #include "pim_pim.h"
 #include "pim_upstream.h"
-#include "pim_rand.h"
 #include "pim_rpf.h"
 #include "pim_ssmpingd.h"
 
@@ -83,7 +82,7 @@ static void pim_free()
 
 void pim_init()
 {
-  pim_rand_init();
+  srandom(time(NULL));
 
   if (!inet_aton(PIM_ALL_PIM_ROUTERS, &qpim_all_pim_routers_addr)) {
     zlog_err("%s %s: could not solve %s to group address: errno=%d: %s",