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@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index cfa23a115d18..6fb2c1c6c32e 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);
 }