linux-kernel - [PATCH V5 2/6] Tools: hv: Gather DHCP information

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Message-Id: <1346878215-30863-2-git-send-email-kys@microsoft.com>
Date:	Wed,  5 Sep 2012 13:50:11 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	ben@...adent.org.uk, thozza@...hat.com, dcbw@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V5 2/6] Tools: hv: Gather DHCP information

Collect information on dhcp setting for the specified interface.
We invoke an external (Distro specific)  script to get this information.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 tools/hv/hv_kvp_daemon.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index cfa23a1..6fb2c1c 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -524,6 +524,9 @@ static void kvp_get_ipconfig_info(char *if_name,
 				 struct hv_kvp_ipaddr_value *buffer)
 {
 	char cmd[512];
+	char dhcp_info[128];
+	char *p;
+	FILE *file;
 
 	/*
 	 * Get the address of default gateway (ipv4).
@@ -572,6 +575,34 @@ static void kvp_get_ipconfig_info(char *if_name,
 	 */
 	kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
 				(MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
+
+	/*
+	 * Gather the DHCP state.
+	 * We will gather this state by invoking an external script.
+	 * The parameter to the script is the interface name.
+	 * Here is the expected output:
+	 *
+	 * Enabled: DHCP enabled.
+	 */
+
+	sprintf(cmd, "%s %s", "hv_get_dhcp_info", if_name);
+
+	file = popen(cmd, "r");
+	if (file == NULL)
+		return;
+
+	p = fgets(dhcp_info, sizeof(dhcp_info), file);
+	if (p == NULL) {
+		pclose(file);
+		return;
+	}
+
+	if (!strncmp(p, "Enabled", 7))
+		buffer->dhcp_enabled = 1;
+	else
+		buffer->dhcp_enabled = 0;
+
+	pclose(file);
 }
 
 
-- 
1.7.4.1

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