[PATCH 5/8] net: dhcp: allow to set transmitted client id

[Jean-Christophe PLAGNIOL-VILLARD]

For net boot setups it is useful to submit boot params like server or
bootfile over dhcp. To distinguish diffrent type of OS running on the same hardware,
a custom client id can be sent in dhcp discover/request messages.

E.g. the ISC dhcp server can be configured with

 | class "at91sam9x5ek" {
 |         match if substring (option vendor-class-identifier,0,20) = "barebox-at91sam9x5ek";
 |
 |         filename "/tftpboot/atmel/at91sam9x5/sam9x5ek/zImage";
 |         if substring (option dhcp-client-identifier,0,7) = "ser2net" {
 |                 filename "/tftpboot/atmel/at91sam9x5/sam9x5ek/zImage-ser2net";
 |         }
 |         option tftp-server-name "192.168.200.98";
 |         option option-150 192.168.200.98;
 |         next-server 192.168.200.98;
 |         option root-path "192.168.200.98:/opt/work/buildroot/build/sam9x5/target";
 | }

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 net/dhcp.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/net/dhcp.c b/net/dhcp.c
index 7d01d4b..5b1ab5a 100644
--- a/net/dhcp.c
+++ b/net/dhcp.c
@@ -257,12 +257,17 @@ static int dhcp_set_string_options(struct dhcp_param *param, u8 *e)
 }
 
 #define DHCP_VENDOR_ID		60
+#define DHCP_CLIENT_ID		61
 
 struct dhcp_param dhcp_params[] = {
 	{
 		.option = DHCP_VENDOR_ID,
 		.handle = dhcp_set_string_options,
 		.barebox_var_name = "dhcp_vendor_id",
+	}, {
+		.option = DHCP_CLIENT_ID,
+		.handle = dhcp_set_string_options,
+		.barebox_var_name = "dhcp_client_id",
 	}
 };
 
@@ -618,11 +623,14 @@ static int do_dhcp(int argc, char *argv[])
 
 	dhcp_reset_env();
 
-	while((opt = getopt(argc, argv, "v:")) > 0) {
+	while((opt = getopt(argc, argv, "v:c:")) > 0) {
 		switch(opt) {
 		case 'v':
 			dhcp_set_param_data(DHCP_VENDOR_ID, optarg);
 			break;
+		case 'c':
+			dhcp_set_param_data(DHCP_CLIENT_ID, optarg);
+			break;
 		}
 	}
 
-- 
1.7.9.1