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authorHolger Weiss <holger@zedat.fu-berlin.de>2016-09-16 07:43:04 (GMT)
committerHolger Weiss <holger@zedat.fu-berlin.de>2016-09-16 07:43:04 (GMT)
commit8672529b37fc73fbcc15cb2b2ba9b677f37dac5e (patch)
tree9a73e784466efaa452f8dec312b0520e0836abc4 /plugins-root/check_dhcp.c
parent99f5be29927de6863849441b8af4b794033cc8bd (diff)
downloadmonitoring-plugins-8672529b37fc73fbcc15cb2b2ba9b677f37dac5e.tar.gz
check_dhcp: Make xid a bit more random
Don't just use the current time(2) to seed the PRNG that generates the xid. A DHCP server might be checked multiple times per second.
Diffstat (limited to 'plugins-root/check_dhcp.c')
-rw-r--r--plugins-root/check_dhcp.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c
index 445ddbc..88b7ca1 100644
--- a/plugins-root/check_dhcp.c
+++ b/plugins-root/check_dhcp.c
@@ -463,10 +463,9 @@ int send_dhcp_discover(int sock){
463 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH; 463 discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH;
464 464
465 /* 465 /*
466 * transaction ID is supposed to be random. We won't use the address so 466 * transaction ID is supposed to be random.
467 * we don't care about high entropy here. time(2) is good enough.
468 */ 467 */
469 srand(time(NULL)); 468 srand(time(NULL)^getpid());
470 packet_xid=random(); 469 packet_xid=random();
471 discover_packet.xid=htonl(packet_xid); 470 discover_packet.xid=htonl(packet_xid);
472 471