231 lines
7.8 KiB
C
231 lines
7.8 KiB
C
/*
|
|
* Copyright 2008, The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/* Utilities for managing the dhcpcd DHCP client daemon */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <arpa/inet.h>
|
|
#include <netinet/in.h>
|
|
|
|
#include <cutils/properties.h>
|
|
|
|
static const char DAEMON_NAME[] = "dhcpcd";
|
|
static const char DAEMON_PROP_NAME[] = "init.svc.dhcpcd";
|
|
static const char HOSTNAME_PROP_NAME[] = "net.hostname";
|
|
static const char DHCP_PROP_NAME_PREFIX[] = "dhcp";
|
|
static const int NAP_TIME = 200; /* wait for 200ms at a time */
|
|
/* when polling for property values */
|
|
static char errmsg[100];
|
|
|
|
/*
|
|
* Wait for a system property to be assigned a specified value.
|
|
* If desired_value is NULL, then just wait for the property to
|
|
* be created with any value. maxwait is the maximum amount of
|
|
* time in seconds to wait before giving up.
|
|
*/
|
|
static int wait_for_property(const char *name, const char *desired_value, int maxwait)
|
|
{
|
|
char value[PROPERTY_VALUE_MAX] = {'\0'};
|
|
int maxnaps = (maxwait * 1000) / NAP_TIME;
|
|
|
|
if (maxnaps < 1) {
|
|
maxnaps = 1;
|
|
}
|
|
|
|
while (maxnaps-- > 0) {
|
|
usleep(NAP_TIME * 1000);
|
|
if (property_get(name, value, NULL)) {
|
|
if (desired_value == NULL ||
|
|
strcmp(value, desired_value) == 0) {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return -1; /* failure */
|
|
}
|
|
|
|
static void fill_ip_info(const char *interface,
|
|
in_addr_t *ipaddr,
|
|
in_addr_t *gateway,
|
|
in_addr_t *mask,
|
|
in_addr_t *dns1,
|
|
in_addr_t *dns2,
|
|
in_addr_t *server,
|
|
uint32_t *lease)
|
|
{
|
|
char prop_name[PROPERTY_KEY_MAX];
|
|
char prop_value[PROPERTY_VALUE_MAX];
|
|
struct in_addr addr;
|
|
in_addr_t iaddr;
|
|
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.ipaddress", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*ipaddr = addr.s_addr;
|
|
} else {
|
|
*ipaddr = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.gateway", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*gateway = addr.s_addr;
|
|
} else {
|
|
*gateway = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.mask", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*mask = addr.s_addr;
|
|
} else {
|
|
*mask = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.dns1", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*dns1 = addr.s_addr;
|
|
} else {
|
|
*dns1 = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.dns2", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*dns2 = addr.s_addr;
|
|
} else {
|
|
*dns2 = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.server", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
|
|
*server = addr.s_addr;
|
|
} else {
|
|
*server = 0;
|
|
}
|
|
snprintf(prop_name, sizeof(prop_name), "%s.%s.leasetime", DHCP_PROP_NAME_PREFIX, interface);
|
|
if (property_get(prop_name, prop_value, NULL)) {
|
|
*lease = atol(prop_value);
|
|
}
|
|
}
|
|
|
|
static const char *ipaddr_to_string(in_addr_t addr)
|
|
{
|
|
struct in_addr in_addr;
|
|
|
|
in_addr.s_addr = addr;
|
|
return inet_ntoa(in_addr);
|
|
}
|
|
|
|
/*
|
|
* Start the dhcp client daemon, and wait for it to finish
|
|
* configuring the interface.
|
|
*/
|
|
int dhcp_do_request(const char *interface,
|
|
in_addr_t *ipaddr,
|
|
in_addr_t *gateway,
|
|
in_addr_t *mask,
|
|
in_addr_t *dns1,
|
|
in_addr_t *dns2,
|
|
in_addr_t *server,
|
|
uint32_t *lease)
|
|
{
|
|
char result_prop_name[PROPERTY_KEY_MAX];
|
|
char prop_value[PROPERTY_VALUE_MAX] = {'\0'};
|
|
char daemon_cmd[PROPERTY_VALUE_MAX * 2];
|
|
const char *ctrl_prop = "ctl.start";
|
|
const char *desired_status = "running";
|
|
|
|
snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result",
|
|
DHCP_PROP_NAME_PREFIX,
|
|
interface);
|
|
/* Erase any previous setting of the dhcp result property */
|
|
property_set(result_prop_name, "");
|
|
|
|
/* Start the daemon and wait until it's ready */
|
|
if (property_get(HOSTNAME_PROP_NAME, prop_value, NULL) && (prop_value[0] != '\0'))
|
|
snprintf(daemon_cmd, sizeof(daemon_cmd), "%s:-h %s %s", DAEMON_NAME,
|
|
prop_value, interface);
|
|
else
|
|
snprintf(daemon_cmd, sizeof(daemon_cmd), "%s:%s", DAEMON_NAME, interface);
|
|
memset(prop_value, '\0', PROPERTY_VALUE_MAX);
|
|
property_set(ctrl_prop, daemon_cmd);
|
|
if (wait_for_property(DAEMON_PROP_NAME, desired_status, 10) < 0) {
|
|
snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for dhcpcd to start");
|
|
return -1;
|
|
}
|
|
|
|
/* Wait for the daemon to return a result */
|
|
if (wait_for_property(result_prop_name, NULL, 30) < 0) {
|
|
snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for DHCP to finish");
|
|
return -1;
|
|
}
|
|
|
|
if (!property_get(result_prop_name, prop_value, NULL)) {
|
|
/* shouldn't ever happen, given the success of wait_for_property() */
|
|
snprintf(errmsg, sizeof(errmsg), "%s", "DHCP result property was not set");
|
|
return -1;
|
|
}
|
|
if (strcmp(prop_value, "ok") == 0) {
|
|
char dns_prop_name[PROPERTY_KEY_MAX];
|
|
fill_ip_info(interface, ipaddr, gateway, mask, dns1, dns2, server, lease);
|
|
/* copy the dhcp.XXX.dns properties to net.XXX.dns */
|
|
snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns1", interface);
|
|
property_set(dns_prop_name, *dns1 ? ipaddr_to_string(*dns1) : "");
|
|
snprintf(dns_prop_name, sizeof(dns_prop_name), "net.%s.dns2", interface);
|
|
property_set(dns_prop_name, *dns2 ? ipaddr_to_string(*dns2) : "");
|
|
return 0;
|
|
} else {
|
|
snprintf(errmsg, sizeof(errmsg), "DHCP result was %s", prop_value);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Stop the DHCP client daemon.
|
|
*/
|
|
int dhcp_stop(const char *interface)
|
|
{
|
|
char result_prop_name[PROPERTY_KEY_MAX];
|
|
const char *ctrl_prop = "ctl.stop";
|
|
const char *desired_status = "stopped";
|
|
|
|
snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result",
|
|
DHCP_PROP_NAME_PREFIX,
|
|
interface);
|
|
/* Stop the daemon and wait until it's reported to be stopped */
|
|
property_set(ctrl_prop, DAEMON_NAME);
|
|
if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) {
|
|
return -1;
|
|
}
|
|
property_set(result_prop_name, "failed");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Release the current DHCP client lease.
|
|
*/
|
|
int dhcp_release_lease(const char *interface)
|
|
{
|
|
const char *ctrl_prop = "ctl.stop";
|
|
const char *desired_status = "stopped";
|
|
|
|
/* Stop the daemon and wait until it's reported to be stopped */
|
|
property_set(ctrl_prop, DAEMON_NAME);
|
|
if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
char *dhcp_get_errmsg() {
|
|
return errmsg;
|
|
}
|