Implement the KVP verb - KVP_OP_SET_IP_INFO. This operation configures the
specified interface based on the given configuration. Since configuring
an interface is very distro specific, we invoke an external script to
configure the interface.
Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Reviewed-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
---
tools/hv/hv_kvp_daemon.c | 324 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 324 insertions(+), 0 deletions(-)
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index c510283..c33fc8e 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -41,6 +41,7 @@
#include <syslog.h>
#include <sys/stat.h>
#include <fcntl.h>
+#include <dirent.h>
/*
* KVP protocol: The user mode component first registers with the
@@ -490,6 +491,105 @@ done:
return;
}
+
+/*
+ * Retrieve an interface name corresponding to the specified guid.
+ * If there is a match, the function returns a pointer
+ * to the interface name and if not, a NULL is returned.
+ * If a match is found, the caller is responsible for
+ * freeing the memory.
+ */
+
+static char *kvp_get_if_name(char *guid)
+{
+ 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[100];
+
+ dir = opendir(kvp_net_dir);
+ if (dir == NULL)
+ return NULL;
+
+ memset(dev_id, 0, sizeof(dev_id));
+ strcat(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, "/device/device_id");
+
+ 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';
+
+ if (!strcmp(p, guid)) {
+ /*
+ * Found the guid match; return the interface
+ * name. The caller will free the memory.
+ */
+ if_name = strdup(entry->d_name);
+ break;
+ }
+ }
+ fclose(file);
+ }
+
+ closedir(dir);
+ return if_name;
+}
+
+/*
+ * Retrieve the MAC address given the interface name.
+ */
+
+static char *kvp_if_name_to_mac(char *if_name)
+{
+ FILE *file;
+ char *p, *x;
+ char buf[256];
+ char addr_file[100];
+ int i;
+ char *mac_addr = NULL;
+
+ memset(addr_file, 0, sizeof(addr_file));
+ strcat(addr_file, "/sys/class/net/");
+ strcat(addr_file, if_name);
+ strcat(addr_file, "/address");
+
+ file = fopen(addr_file, "r");
+ if (file == NULL)
+ return NULL;
+
+ 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]);
+ mac_addr = strdup(p);
+ }
+
+ fclose(file);
+ return mac_addr;
+}
+
+
static void kvp_process_ipconfig_file(char *cmd,
char *config_buf, int len,
int element_size, int offset)
@@ -799,6 +899,207 @@ getaddr_done:
}
+int parse_ip_val_buffer(char *in_buf, int *offset, char *out_buf, int out_len)
+{
+ char *x;
+ char *start;
+
+ /*
+ * in_buf has sequence of characters that are seperated by
+ * the character ';'. The last sequence is terminated by ';'.
+ */
+ start = in_buf + *offset;
+
+ x = strchr(start, ';');
+ if (x) {
+ *x = 0;
+ if ((x - start) <= out_len) {
+ strcpy(out_buf, start);
+ strcat(out_buf, "\n");
+ *offset = (x - start) + 1;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
+static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
+{
+ int error = 0;
+ char if_file[50];
+ FILE *file;
+ char addr[INET6_ADDRSTRLEN];
+ int i;
+ char str[256];
+ char sub_str[10];
+ int offset;
+ char cmd[512];
+ char *mac_addr;
+
+ /*
+ * Set the configuration for the specified interface with
+ * the information provided. Since there is no standard
+ * way to configure an interface, we will have an external
+ * script that does the job of configuring the interface and
+ * flushing the configuration.
+ *
+ * The parameters passed to this external script are:
+ * 1. A configuration file that has the specified configuration.
+ *
+ * We will embed the name of the interface in the configuration
+ * file: ifcfg-ethx (where ethx is the interface name).
+ *
+ * Here is the format of the ip configuration file:
+ *
+ * HWADDR=macaddr
+ * BOOTPROTO=dhcp (dhcp enabled for the interface)
+ * IPADDR_x=ipaddr
+ * NETMASK_x=netmask
+ * GATEWAY_x=gateway
+ * DNSx=dns
+ */
+
+ memset(if_file, 0, sizeof(if_file));
+ strcat(if_file, "/var/opt/hyperv/ifcfg-");
+ strcat(if_file, if_name);
+
+ file = fopen(if_file, "w");
+
+ if (file == NULL)
+ return 1;
+
+ /*
+ * First write out the MAC address.
+ */
+
+ mac_addr = kvp_if_name_to_mac(if_name);
+ if (mac_addr == NULL) {
+ error = 1;
+ goto setval_error;
+ }
+
+ memset(str, 0, sizeof(str));
+ strcat(str, "HWADDR=");
+ strcat(str, mac_addr);
+ strcat(str, "\n");
+ error = fputs(str, file);
+ if (error == EOF)
+ goto setval_error;
+
+ if (new_val->dhcp_enabled) {
+ error = fputs("BOOTPROTO=dhcp\n", file);
+ if (error == EOF)
+ goto setval_error;
+
+ /*
+ * We are done!.
+ */
+ goto setval_done;
+ }
+
+ /*
+ * Write the configuration for ipaddress, netmask, gateway and
+ * name servers.
+ */
+ i = 0;
+ offset = 0;
+ memset(addr, 0, sizeof(addr));
+ memset(str, 0, sizeof(str));
+
+ while (parse_ip_val_buffer((char *)new_val->ip_addr, &offset, addr,
+ (MAX_IP_ADDR_SIZE * 2))) {
+ memset(sub_str, 0, sizeof(sub_str));
+ strcat(str, "IPADDR");
+ if (i != 0)
+ sprintf(sub_str, "_%d", i);
+ strcat(str, sub_str);
+ i++;
+ strcat(str, "=");
+ strcat(str, addr);
+
+ error = fputs(str, file);
+ if (error == EOF)
+ goto setval_error;
+ }
+
+ i = 0;
+ offset = 0;
+ memset(addr, 0, sizeof(addr));
+ memset(str, 0, sizeof(str));
+
+ while (parse_ip_val_buffer((char *)new_val->sub_net, &offset, addr,
+ (MAX_IP_ADDR_SIZE * 2))) {
+ memset(sub_str, 0, sizeof(sub_str));
+ sprintf(str, "NETMAK");
+ if (i != 0)
+ sprintf(sub_str, "_%d", i);
+ strcat(str, sub_str);
+ i++;
+ strcat(str, "=");
+ strcat(str, addr);
+ error = fputs(str, file);
+ if (error == EOF)
+ goto setval_error;
+ }
+
+ i = 0;
+ offset = 0;
+ memset(addr, 0, sizeof(addr));
+ memset(str, 0, sizeof(str));
+
+ while (parse_ip_val_buffer((char *)new_val->gate_way, &offset, addr,
+ (MAX_IP_ADDR_SIZE * 2))) {
+ memset(sub_str, 0, sizeof(sub_str));
+ sprintf(str, "GATEWAY");
+ if (i != 0)
+ sprintf(sub_str, "_%d", i);
+ strcat(str, sub_str);
+ i++;
+ strcat(str, "=");
+ strcat(str, addr);
+ error = fputs(str, file);
+ if (error == EOF)
+ goto setval_error;
+ }
+
+ i = 1;
+ offset = 0;
+ memset(addr, 0, sizeof(addr));
+ memset(str, 0, sizeof(str));
+
+ while (parse_ip_val_buffer((char *)new_val->dns_addr, &offset, addr,
+ (MAX_IP_ADDR_SIZE * 2))) {
+ sprintf(str, "DNS%d=", i++);
+ strcat(str, addr);
+ error = fputs(str, file);
+ if (error == EOF)
+ goto setval_error;
+ }
+
+
+setval_done:
+ free(mac_addr);
+ fclose(file);
+
+ /*
+ * Now that we have populated the configuration file,
+ * invoke the external script to do its magic.
+ */
+
+ memset(cmd, 0, 512);
+ strcat(cmd, "/sbin/hv_set_ifconfig ");
+ strcat(cmd, if_file);
+ system(cmd);
+ return 0;
+
+setval_error:
+ free(mac_addr);
+ fclose(file);
+ return error;
+}
+
+
static int
kvp_get_domain_name(char *buffer, int length)
{
@@ -868,6 +1169,8 @@ int main(void)
char *key_name;
int op;
int pool;
+ char *if_name;
+ struct hv_kvp_ipaddr_value *kvp_ip_val;
daemon(1, 0);
openlog("KVP", 0, LOG_USER);
@@ -969,6 +1272,27 @@ int main(void)
}
continue;
+ case KVP_OP_SET_IP_INFO:
+ kvp_ip_val = &hv_msg->body.kvp_ip_val;
+ if_name = kvp_get_if_name(
+ (char *)kvp_ip_val->adapter_id);
+ if (if_name == NULL) {
+ /*
+ * We could not map the guid to an
+ * interface name; return error.
+ */
+ *((int *)(&hv_msg->kvp_hdr.operation)) =
+ HV_ERROR_DEVICE_NOT_CONNECTED;
+ break;
+ }
+ error = kvp_set_ip_info(if_name, kvp_ip_val);
+ if (error)
+ *((int *)(&hv_msg->kvp_hdr.operation)) =
+ HV_ERROR_DEVICE_NOT_CONNECTED;
+
+ free(if_name);
+ break;
+
case KVP_OP_SET:
if (kvp_key_add_or_modify(pool,
hv_msg->body.kvp_set.data.key,
--
1.7.4.1
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