Tools: hv: Implement the KVP verb - KVP_OP_GET_IP_INFO

Now implement the KVP verb - KVP_OP_GET_IP_INFO. This operation retrieves IP
information for the specified interface.

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, 90 insertions, 3 deletions

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 849c43817a2d..c8e101363735 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -603,6 +603,69 @@ static char *kvp_if_name_to_mac(char *if_name)
 }
 
 
+/*
+ * Retrieve the interface name given tha MAC address.
+ */
+
+static char *kvp_mac_to_if_name(char *mac)
+{
+        DIR *dir;
+        struct dirent *entry;
+        FILE    *file;
+        char    *p, *q, *x;
+        char    *if_name = NULL;
+        char    buf[256];
+        char *kvp_net_dir = "/sys/class/net/";
+        char dev_id[256];
+        int i;
+
+        dir = opendir(kvp_net_dir);
+        if (dir == NULL)
+                return NULL;
+
+        snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
+        q = dev_id + strlen(kvp_net_dir);
+
+        while ((entry = readdir(dir)) != NULL) {
+                /*
+                 * Set the state for the next pass.
+                 */
+                *q = '\0';
+
+                strcat(dev_id, entry->d_name);
+                strcat(dev_id, "/address");
+
+                file = fopen(dev_id, "r");
+                if (file == NULL)
+                        continue;
+
+                p = fgets(buf, sizeof(buf), file);
+                if (p) {
+                        x = strchr(p, '\n');
+                        if (x)
+                                *x = '\0';
+
+                        for (i = 0; i < strlen(p); i++)
+                                p[i] = toupper(p[i]);
+
+                        if (!strcmp(p, mac)) {
+                                /*
+                                 * Found the MAC match; return the interface
+                                 * name. The caller will free the memory.
+                                 */
+                                if_name = strdup(entry->d_name);
+                                fclose(file);
+                                break;
+                        }
+                }
+                fclose(file);
+        }
+
+        closedir(dir);
+        return if_name;
+}
+
+
 static void kvp_process_ipconfig_file(char *cmd,
                                         char *config_buf, int len,
                                         int element_size, int offset)
@@ -749,10 +812,10 @@ static int kvp_process_ip_address(void *addrp,
         }
 
         if ((length - *offset) < addr_length + 1)
-                return 1;
+                return HV_E_FAIL;
         if (str == NULL) {
                 strcpy(buffer, "inet_ntop failed\n");
-                return 1;
+                return HV_E_FAIL;
         }
         if (*offset == 0)
                 strcpy(buffer, tmp);
@@ -796,7 +859,7 @@ kvp_get_ip_info(int family, char *if_name, int op,
 
         if (getifaddrs(&ifap)) {
                 strcpy(buffer, "getifaddrs failed\n");
-                return 1;
+                return HV_E_FAIL;
         }
 
         curp = ifap;
@@ -1386,6 +1449,30 @@ int main(void)
                 }
 
                 switch (op) {
+                case KVP_OP_GET_IP_INFO:
+                        kvp_ip_val = &hv_msg->body.kvp_ip_val;
+                        if_name =
+                        kvp_mac_to_if_name((char *)kvp_ip_val->adapter_id);
+
+                        if (if_name == NULL) {
+                                /*
+                                 * We could not map the mac address to an
+                                 * interface name; return error.
+                                 */
+                                hv_msg->error = HV_E_FAIL;
+                                break;
+                        }
+                        error = kvp_get_ip_info(
+                                                0, if_name, KVP_OP_GET_IP_INFO,
+                                                kvp_ip_val,
+                                                (MAX_IP_ADDR_SIZE * 2));
+
+                        if (error)
+                                hv_msg->error = error;
+
+                        free(if_name);
+                        break;
+
                 case KVP_OP_SET_IP_INFO:
                         kvp_ip_val = &hv_msg->body.kvp_ip_val;
                         if_name = kvp_get_if_name(