 |
Use hardware address as default dhcp client identifier - sdhcp - simple dhcp cl… |
 |
git clone git://git.codemadness.org/sdhcp |
 |
Log |
|
Files |
|
Refs |
|
LICENSE |
|
--- |
|
commit 5ad98876ed3e0d8024c8e65174a675bd35ce058e |
|
parent 3da0238a42595c0edf641d504d051f15348a205c |
|
Author: sin <[email protected]> |
|
Date: Wed, 13 Jan 2016 19:28:39 +0000 |
|
|
|
Use hardware address as default dhcp client identifier |
|
|
|
Diffstat: |
|
M sdhcp.c | 15 +++++++++++---- |
|
|
|
1 file changed, 11 insertions(+), 4 deletions(-) |
|
--- |
|
diff --git a/sdhcp.c b/sdhcp.c |
|
@@ -86,7 +86,8 @@ static unsigned char xid[sizeof bp.xid]; |
|
static unsigned char hwaddr[16]; |
|
static time_t starttime; |
|
static char *ifname = "eth0"; |
|
-static char *cid = ""; |
|
+static unsigned char cid[16]; |
|
+static size_t cidlen; |
|
static char *program = ""; |
|
static int sock; |
|
/* sav */ |
|
@@ -274,7 +275,7 @@ dhcpsend(int type, int how) |
|
memcpy(bp.chaddr, hwaddr, sizeof bp.chaddr); |
|
p = bp.optdata; |
|
p = hnoptput(p, ODtype, type, 1); |
|
- p = optput(p, ODclientid, (unsigned char*)cid, strlen(cid)); |
|
+ p = optput(p, ODclientid, cid, cidlen); |
|
|
|
switch(type) { |
|
case DHCPdiscover: |
|
@@ -465,8 +466,12 @@ main(int argc, char *argv[]) |
|
|
|
if (argc) |
|
ifname = argv[0]; /* interface name */ |
|
- if (argc >= 2) |
|
- cid = argv[1]; /* client-id */ |
|
+ if (argc >= 2) { |
|
+ cidlen = strlen(argv[1]); |
|
+ if (cidlen > sizeof(cid)) |
|
+ cidlen = sizeof(cid); |
|
+ strlcpy(cid, argv[1], cidlen); /* client-id */ |
|
+ } |
|
|
|
memset(&ifreq, 0, sizeof(ifreq)); |
|
signal(SIGALRM, nop); |
|
@@ -486,6 +491,8 @@ main(int argc, char *argv[]) |
|
eprintf("bind:"); |
|
ioctl(sock, SIOCGIFHWADDR, &ifreq); |
|
memcpy(hwaddr, ifreq.ifr_hwaddr.sa_data, sizeof ifreq.ifr_hwaddr.sa_da… |
|
+ if (!cidlen) |
|
+ memcpy(cid, hwaddr, cidlen = sizeof(hwaddr)); |
|
|
|
if ((rnd = open("/dev/urandom", O_RDONLY)) == -1) |
|
eprintf("can't open /dev/urandom to generate unique transactio… |
