[PATCH v2 2/3] gdhcp: add RFC 1533- and 2132-compliant client-id option

This patch adds a function to add a RFC 1533- and 2132-compliant DHCP
client-id option (61) to sent DHCPv4 packets.

---
 gdhcp/client.c |   22 ++++++++++++++++++++++
 gdhcp/gdhcp.h  |    2 ++
 2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/gdhcp/client.c b/gdhcp/client.c
index 1a7e007..7dcf40e 100644
--- a/gdhcp/client.c
+++ b/gdhcp/client.c
@@ -2470,6 +2470,28 @@ static uint8_t *alloc_dhcp_string_option(int code, const 
char *str)
        return alloc_dhcp_data_option(code, (const uint8_t *)str, strlen(str));
 }
 
+GDHCPClientError g_dhcp_client_set_id(GDHCPClient *dhcp_client)
+{
+       const unsigned maclen = 6;
+       const unsigned idlen = maclen + 1;
+       const uint8_t option_code = G_DHCP_CLIENT_ID;
+       uint8_t idbuf[idlen];
+       uint8_t *data_option;
+
+       idbuf[0] = ARPHRD_ETHER;
+
+       memcpy(&idbuf[1], dhcp_client->mac_address, maclen);
+
+       data_option = alloc_dhcp_data_option(option_code, idbuf, idlen);
+       if (data_option == NULL)
+               return G_DHCP_CLIENT_ERROR_NOMEM;
+
+       g_hash_table_insert(dhcp_client->send_value_hash,
+               GINT_TO_POINTER((int) option_code), data_option);
+
+       return G_DHCP_CLIENT_ERROR_NONE;
+}
+
 /* Now only support send hostname */
 GDHCPClientError g_dhcp_client_set_send(GDHCPClient *dhcp_client,
                unsigned char option_code, const char *option_value)
diff --git a/gdhcp/gdhcp.h b/gdhcp/gdhcp.h
index edebc9e..4453b26 100644
--- a/gdhcp/gdhcp.h
+++ b/gdhcp/gdhcp.h
@@ -74,6 +74,7 @@ typedef enum {
 #define G_DHCP_DOMAIN_NAME     0x0f
 #define G_DHCP_HOST_NAME       0x0c
 #define G_DHCP_NTP_SERVER      0x2a
+#define G_DHCP_CLIENT_ID       0x3d
 
 #define G_DHCPV6_CLIENTID      1
 #define G_DHCPV6_SERVERID      2
@@ -121,6 +122,7 @@ GDHCPClientError g_dhcp_client_set_request(GDHCPClient 
*client,
                                                unsigned int option_code);
 void g_dhcp_client_clear_requests(GDHCPClient *dhcp_client);
 void g_dhcp_client_clear_values(GDHCPClient *dhcp_client);
+GDHCPClientError g_dhcp_client_set_id(GDHCPClient *client);
 GDHCPClientError g_dhcp_client_set_send(GDHCPClient *client,
                                                unsigned char option_code,
                                                const char *option_value);
-- 
1.7.8.2
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