208 lines
6.8 KiB
C
208 lines
6.8 KiB
C
/*
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* Copyright 2008, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Utilities for managing the dhcpcd DHCP client daemon */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <cutils/properties.h>
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static const char DAEMON_NAME[] = "dhcpcd";
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static const char DAEMON_PROP_NAME[] = "init.svc.dhcpcd";
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static const char DHCP_PROP_NAME_PREFIX[] = "dhcp";
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static const int NAP_TIME = 1; /* wait for 1 second at a time */
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/* when polling for property values */
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static char errmsg[100];
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/*
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* Wait for a system property to be assigned a specified value.
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* If desired_value is NULL, then just wait for the property to
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* be created with any value. maxwait is the maximum amount of
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* time in seconds to wait before giving up.
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*/
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static int wait_for_property(const char *name, const char *desired_value, int maxwait)
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{
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char value[PROPERTY_VALUE_MAX] = {'\0'};
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int maxnaps = maxwait / NAP_TIME;
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if (maxnaps < 1) {
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maxnaps = 1;
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}
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while (maxnaps-- > 0) {
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usleep(1000000);
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if (property_get(name, value, NULL)) {
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if (desired_value == NULL ||
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strcmp(value, desired_value) == 0) {
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return 0;
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}
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}
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}
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return -1; /* failure */
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}
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static void fill_ip_info(const char *interface,
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in_addr_t *ipaddr,
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in_addr_t *gateway,
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in_addr_t *mask,
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in_addr_t *dns1,
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in_addr_t *dns2,
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in_addr_t *server,
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uint32_t *lease)
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{
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char prop_name[PROPERTY_KEY_MAX];
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char prop_value[PROPERTY_VALUE_MAX];
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struct in_addr addr;
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in_addr_t iaddr;
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snprintf(prop_name, sizeof(prop_name), "%s.%s.ipaddress", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*ipaddr = addr.s_addr;
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} else {
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*ipaddr = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.gateway", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*gateway = addr.s_addr;
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} else {
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*gateway = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.mask", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*mask = addr.s_addr;
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} else {
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*mask = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.dns1", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*dns1 = addr.s_addr;
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} else {
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*dns1 = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.dns2", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*dns2 = addr.s_addr;
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} else {
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*dns2 = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.server", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) {
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*server = addr.s_addr;
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} else {
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*server = 0;
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}
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snprintf(prop_name, sizeof(prop_name), "%s.%s.leasetime", DHCP_PROP_NAME_PREFIX, interface);
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if (property_get(prop_name, prop_value, NULL)) {
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*lease = atol(prop_value);
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}
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}
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/*
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* Start the dhcp client daemon, and wait for it to finish
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* configuring the interface.
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*/
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int dhcp_do_request(const char *interface,
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in_addr_t *ipaddr,
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in_addr_t *gateway,
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in_addr_t *mask,
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in_addr_t *dns1,
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in_addr_t *dns2,
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in_addr_t *server,
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uint32_t *lease)
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{
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char result_prop_name[PROPERTY_KEY_MAX];
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char prop_value[PROPERTY_VALUE_MAX] = {'\0'};
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const char *ctrl_prop = "ctl.start";
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const char *desired_status = "running";
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snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result",
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DHCP_PROP_NAME_PREFIX,
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interface);
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/* Erase any previous setting of the dhcp result property */
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property_set(result_prop_name, "");
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/* Start the daemon and wait until it's ready */
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property_set(ctrl_prop, DAEMON_NAME);
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if (wait_for_property(DAEMON_PROP_NAME, desired_status, 10) < 0) {
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snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for dhcpcd to start");
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return -1;
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}
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/* Wait for the daemon to return a result */
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if (wait_for_property(result_prop_name, NULL, 30) < 0) {
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snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for DHCP to finish");
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return -1;
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}
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if (!property_get(result_prop_name, prop_value, NULL)) {
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/* shouldn't ever happen, given the success of wait_for_property() */
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snprintf(errmsg, sizeof(errmsg), "%s", "DHCP result property was not set");
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return -1;
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}
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if (strcmp(prop_value, "ok") == 0) {
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fill_ip_info(interface, ipaddr, gateway, mask, dns1, dns2, server, lease);
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return 0;
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} else {
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snprintf(errmsg, sizeof(errmsg), "DHCP result was %s", prop_value);
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return -1;
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}
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}
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/**
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* Stop the DHCP client daemon.
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*/
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int dhcp_stop(const char *interface)
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{
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char result_prop_name[PROPERTY_KEY_MAX];
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const char *ctrl_prop = "ctl.stop";
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const char *desired_status = "stopped";
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snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result",
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DHCP_PROP_NAME_PREFIX,
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interface);
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/* Stop the daemon and wait until it's reported to be stopped */
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property_set(ctrl_prop, DAEMON_NAME);
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if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) {
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return -1;
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}
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property_set(result_prop_name, "failed");
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return 0;
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}
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/**
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* Release the current DHCP client lease.
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*/
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int dhcp_release_lease(const char *interface)
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{
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const char *ctrl_prop = "ctl.stop";
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const char *desired_status = "stopped";
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/* Stop the daemon and wait until it's reported to be stopped */
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property_set(ctrl_prop, DAEMON_NAME);
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if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) {
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return -1;
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}
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return 0;
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}
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char *dhcp_get_errmsg() {
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return errmsg;
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}
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