[06/16] kvm tools: Fill DHCP options with domain name and DNS server IP

Commit Message

Asias He July 17, 2011, 8:56 a.m. UTC

Domain name and DNS server IP address are filled.

Signed-off-by: Asias He <[e-mail]>
---
 tools/kvm/include/kvm/uip.h |    4 ++++
 tools/kvm/net/uip/dhcp.c    |   27 +++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 0 deletions(-)

Patch

diff --git a/tools/kvm/include/kvm/uip.h b/tools/kvm/include/kvm/uip.h
index e645d3f..2586583 100644
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -46,6 +46,10 @@ 
 #define UIP_DHCP_MAX_DOMAIN_NAME_LEN	256
 #define UIP_DHCP_TAG_MSG_TYPE		53
 #define UIP_DHCP_TAG_MSG_TYPE_LEN	1
+#define UIP_DHCP_TAG_DNS_SERVER		6
+#define UIP_DHCP_TAG_DNS_SERVER_LEN	4
+#define UIP_DHCP_TAG_DOMAIN_NAME	15
+
 /*
  * IP package maxium len == 64 KBytes
  * IP header == 20 Bytes
diff --git a/tools/kvm/net/uip/dhcp.c b/tools/kvm/net/uip/dhcp.c
index 9321cdc..79ddd00 100644
--- a/tools/kvm/net/uip/dhcp.c
+++ b/tools/kvm/net/uip/dhcp.c
@@ -63,3 +63,30 @@  out:
 	fclose(fp);
 	return ret;
 }
+
+static int uip_dhcp_fill_option_name_and_server(struct uip_info *info, u8 *opt, int i)
+{
+	u8 domain_name_len;
+	u32 *addr;
+	int n;
+
+	if (info->domain_name) {
+		domain_name_len	= strlen(info->domain_name);
+		opt[i++]	= UIP_DHCP_TAG_DOMAIN_NAME;
+		opt[i++]	= domain_name_len;
+		memcpy(&opt[i], info->domain_name, domain_name_len);
+		i		+= domain_name_len;
+	}
+
+	for (n = 0; n < UIP_DHCP_MAX_DNS_SERVER_NR; n++) {
+		if (info->dns_ip[n] == 0)
+			continue;
+		opt[i++]	= UIP_DHCP_TAG_DNS_SERVER;
+		opt[i++]	= UIP_DHCP_TAG_DNS_SERVER_LEN;
+		addr		= (u32 *)&opt[i];
+		*addr		= htonl(info->dns_ip[n]);
+		i		+= UIP_DHCP_TAG_DNS_SERVER_LEN;
+	}
+
+	return i;
+}