The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | /* Utilities for managing the dhcpcd DHCP client daemon */ |
| 18 | |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <unistd.h> |
| 22 | #include <arpa/inet.h> |
| 23 | #include <netinet/in.h> |
| 24 | |
| 25 | #include <cutils/properties.h> |
| 26 | |
Dmitry Shmidt | 9363b7d | 2009-12-14 15:41:54 -0800 | [diff] [blame^] | 27 | static const char DAEMON_NAME[] = "dhcpcd"; |
| 28 | static const char DAEMON_PROP_NAME[] = "init.svc.dhcpcd"; |
| 29 | static const char HOSTNAME_PROP_NAME[] = "net.hostname"; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 30 | static const char DHCP_PROP_NAME_PREFIX[] = "dhcp"; |
| 31 | static const int NAP_TIME = 1; /* wait for 1 second at a time */ |
| 32 | /* when polling for property values */ |
| 33 | static char errmsg[100]; |
| 34 | |
| 35 | /* |
| 36 | * Wait for a system property to be assigned a specified value. |
| 37 | * If desired_value is NULL, then just wait for the property to |
| 38 | * be created with any value. maxwait is the maximum amount of |
| 39 | * time in seconds to wait before giving up. |
| 40 | */ |
| 41 | static int wait_for_property(const char *name, const char *desired_value, int maxwait) |
| 42 | { |
| 43 | char value[PROPERTY_VALUE_MAX] = {'\0'}; |
| 44 | int maxnaps = maxwait / NAP_TIME; |
| 45 | |
| 46 | if (maxnaps < 1) { |
| 47 | maxnaps = 1; |
| 48 | } |
| 49 | |
| 50 | while (maxnaps-- > 0) { |
| 51 | usleep(1000000); |
| 52 | if (property_get(name, value, NULL)) { |
| 53 | if (desired_value == NULL || |
| 54 | strcmp(value, desired_value) == 0) { |
| 55 | return 0; |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | return -1; /* failure */ |
| 60 | } |
| 61 | |
| 62 | static void fill_ip_info(const char *interface, |
| 63 | in_addr_t *ipaddr, |
| 64 | in_addr_t *gateway, |
| 65 | in_addr_t *mask, |
| 66 | in_addr_t *dns1, |
| 67 | in_addr_t *dns2, |
| 68 | in_addr_t *server, |
| 69 | uint32_t *lease) |
| 70 | { |
| 71 | char prop_name[PROPERTY_KEY_MAX]; |
| 72 | char prop_value[PROPERTY_VALUE_MAX]; |
| 73 | struct in_addr addr; |
| 74 | in_addr_t iaddr; |
| 75 | |
| 76 | snprintf(prop_name, sizeof(prop_name), "%s.%s.ipaddress", DHCP_PROP_NAME_PREFIX, interface); |
| 77 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 78 | *ipaddr = addr.s_addr; |
| 79 | } else { |
| 80 | *ipaddr = 0; |
| 81 | } |
| 82 | snprintf(prop_name, sizeof(prop_name), "%s.%s.gateway", DHCP_PROP_NAME_PREFIX, interface); |
| 83 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 84 | *gateway = addr.s_addr; |
| 85 | } else { |
| 86 | *gateway = 0; |
| 87 | } |
| 88 | snprintf(prop_name, sizeof(prop_name), "%s.%s.mask", DHCP_PROP_NAME_PREFIX, interface); |
| 89 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 90 | *mask = addr.s_addr; |
| 91 | } else { |
| 92 | *mask = 0; |
| 93 | } |
| 94 | snprintf(prop_name, sizeof(prop_name), "%s.%s.dns1", DHCP_PROP_NAME_PREFIX, interface); |
| 95 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 96 | *dns1 = addr.s_addr; |
| 97 | } else { |
| 98 | *dns1 = 0; |
| 99 | } |
| 100 | snprintf(prop_name, sizeof(prop_name), "%s.%s.dns2", DHCP_PROP_NAME_PREFIX, interface); |
| 101 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 102 | *dns2 = addr.s_addr; |
| 103 | } else { |
| 104 | *dns2 = 0; |
| 105 | } |
| 106 | snprintf(prop_name, sizeof(prop_name), "%s.%s.server", DHCP_PROP_NAME_PREFIX, interface); |
| 107 | if (property_get(prop_name, prop_value, NULL) && inet_aton(prop_value, &addr)) { |
| 108 | *server = addr.s_addr; |
| 109 | } else { |
| 110 | *server = 0; |
| 111 | } |
| 112 | snprintf(prop_name, sizeof(prop_name), "%s.%s.leasetime", DHCP_PROP_NAME_PREFIX, interface); |
| 113 | if (property_get(prop_name, prop_value, NULL)) { |
| 114 | *lease = atol(prop_value); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Start the dhcp client daemon, and wait for it to finish |
| 120 | * configuring the interface. |
| 121 | */ |
| 122 | int dhcp_do_request(const char *interface, |
| 123 | in_addr_t *ipaddr, |
| 124 | in_addr_t *gateway, |
| 125 | in_addr_t *mask, |
| 126 | in_addr_t *dns1, |
| 127 | in_addr_t *dns2, |
| 128 | in_addr_t *server, |
| 129 | uint32_t *lease) |
| 130 | { |
| 131 | char result_prop_name[PROPERTY_KEY_MAX]; |
| 132 | char prop_value[PROPERTY_VALUE_MAX] = {'\0'}; |
Dmitry Shmidt | 9363b7d | 2009-12-14 15:41:54 -0800 | [diff] [blame^] | 133 | char daemon_cmd[PROPERTY_VALUE_MAX * 2]; |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 134 | const char *ctrl_prop = "ctl.start"; |
| 135 | const char *desired_status = "running"; |
| 136 | |
| 137 | snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result", |
| 138 | DHCP_PROP_NAME_PREFIX, |
| 139 | interface); |
| 140 | /* Erase any previous setting of the dhcp result property */ |
| 141 | property_set(result_prop_name, ""); |
| 142 | |
| 143 | /* Start the daemon and wait until it's ready */ |
Dmitry Shmidt | 9363b7d | 2009-12-14 15:41:54 -0800 | [diff] [blame^] | 144 | if (property_get(HOSTNAME_PROP_NAME, prop_value, NULL) && (prop_value[0] != '\0')) |
| 145 | snprintf(daemon_cmd, sizeof(daemon_cmd), "%s:-h %s %s", DAEMON_NAME, |
| 146 | prop_value, interface); |
| 147 | else |
| 148 | snprintf(daemon_cmd, sizeof(daemon_cmd), "%s:%s", DAEMON_NAME, interface); |
| 149 | memset(prop_value, '\0', PROPERTY_VALUE_MAX); |
| 150 | property_set(ctrl_prop, daemon_cmd); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 151 | if (wait_for_property(DAEMON_PROP_NAME, desired_status, 10) < 0) { |
| 152 | snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for dhcpcd to start"); |
| 153 | return -1; |
| 154 | } |
| 155 | |
| 156 | /* Wait for the daemon to return a result */ |
| 157 | if (wait_for_property(result_prop_name, NULL, 30) < 0) { |
| 158 | snprintf(errmsg, sizeof(errmsg), "%s", "Timed out waiting for DHCP to finish"); |
| 159 | return -1; |
| 160 | } |
| 161 | |
| 162 | if (!property_get(result_prop_name, prop_value, NULL)) { |
| 163 | /* shouldn't ever happen, given the success of wait_for_property() */ |
| 164 | snprintf(errmsg, sizeof(errmsg), "%s", "DHCP result property was not set"); |
| 165 | return -1; |
| 166 | } |
| 167 | if (strcmp(prop_value, "ok") == 0) { |
| 168 | fill_ip_info(interface, ipaddr, gateway, mask, dns1, dns2, server, lease); |
| 169 | return 0; |
| 170 | } else { |
| 171 | snprintf(errmsg, sizeof(errmsg), "DHCP result was %s", prop_value); |
| 172 | return -1; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Stop the DHCP client daemon. |
| 178 | */ |
| 179 | int dhcp_stop(const char *interface) |
| 180 | { |
| 181 | char result_prop_name[PROPERTY_KEY_MAX]; |
| 182 | const char *ctrl_prop = "ctl.stop"; |
| 183 | const char *desired_status = "stopped"; |
| 184 | |
| 185 | snprintf(result_prop_name, sizeof(result_prop_name), "%s.%s.result", |
| 186 | DHCP_PROP_NAME_PREFIX, |
| 187 | interface); |
| 188 | /* Stop the daemon and wait until it's reported to be stopped */ |
| 189 | property_set(ctrl_prop, DAEMON_NAME); |
| 190 | if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) { |
| 191 | return -1; |
| 192 | } |
| 193 | property_set(result_prop_name, "failed"); |
| 194 | return 0; |
| 195 | } |
| 196 | |
| 197 | /** |
| 198 | * Release the current DHCP client lease. |
| 199 | */ |
| 200 | int dhcp_release_lease(const char *interface) |
| 201 | { |
| 202 | const char *ctrl_prop = "ctl.stop"; |
| 203 | const char *desired_status = "stopped"; |
| 204 | |
| 205 | /* Stop the daemon and wait until it's reported to be stopped */ |
| 206 | property_set(ctrl_prop, DAEMON_NAME); |
| 207 | if (wait_for_property(DAEMON_PROP_NAME, desired_status, 5) < 0) { |
| 208 | return -1; |
| 209 | } |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | char *dhcp_get_errmsg() { |
| 214 | return errmsg; |
| 215 | } |