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| author |  Holger Weiss <holger@zedat.fu-berlin.de>
| 2016-09-16 09:43:04 +0200 |
|---|---|---|
| committer | Holger Weiss <holger@zedat.fu-berlin.de>
| 2016-09-16 09:43:04 +0200 |
| commit | 8672529b37fc73fbcc15cb2b2ba9b677f37dac5e (patch) | |
| tree | 9a73e784466efaa452f8dec312b0520e0836abc4 /plugins-root/check_dhcp.c | |
| parent | 99f5be29927de6863849441b8af4b794033cc8bd (diff) | |
| download | monitoring-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.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c index 445ddbc1..88b7ca10 100644 --- a/plugins-root/check_dhcp.c +++ b/plugins-root/check_dhcp.c @@ -463,10 +463,9 @@ int send_dhcp_discover(int sock){ discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH; /* - * transaction ID is supposed to be random. We won't use the address so - * we don't care about high entropy here. time(2) is good enough. + * transaction ID is supposed to be random. */ - srand(time(NULL)); + srand(time(NULL)^getpid()); packet_xid=random(); discover_packet.xid=htonl(packet_xid); |