The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 3 | * Copyright (c) 2006-2012 Roy Marples <roy@marples.name> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | #include <ctype.h> |
| 29 | #include <errno.h> |
| 30 | #include <fcntl.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <string.h> |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 33 | #include <syslog.h> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 34 | #include <unistd.h> |
| 35 | |
| 36 | #include "config.h" |
| 37 | #include "common.h" |
| 38 | #include "dhcp.h" |
| 39 | |
| 40 | #define REQUEST (1 << 0) |
| 41 | #define UINT8 (1 << 1) |
| 42 | #define UINT16 (1 << 2) |
| 43 | #define SINT16 (1 << 3) |
| 44 | #define UINT32 (1 << 4) |
| 45 | #define SINT32 (1 << 5) |
| 46 | #define IPV4 (1 << 6) |
| 47 | #define STRING (1 << 7) |
| 48 | #define PAIR (1 << 8) |
| 49 | #define ARRAY (1 << 9) |
| 50 | #define RFC3361 (1 << 10) |
| 51 | #define RFC3397 (1 << 11) |
| 52 | #define RFC3442 (1 << 12) |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 53 | #define RFC5969 (1 << 13) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 54 | |
| 55 | #define IPV4R IPV4 | REQUEST |
| 56 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 57 | #define DAD "Duplicate address detected" |
| 58 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 59 | /* Our aggregate option buffer. |
| 60 | * We ONLY use this when options are split, which for most purposes is |
| 61 | * practically never. See RFC3396 for details. */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 62 | static uint8_t *opt_buffer; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 63 | |
| 64 | struct dhcp_opt { |
| 65 | uint8_t option; |
| 66 | int type; |
| 67 | const char *var; |
| 68 | }; |
| 69 | |
| 70 | static const struct dhcp_opt const dhcp_opts[] = { |
| 71 | { 1, IPV4 | REQUEST, "subnet_mask" }, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 72 | /* RFC 3442 states that the CSR has to come before all other |
| 73 | * routes. For completeness, we also specify static routes, |
| 74 | * then routers. */ |
| 75 | { 121, RFC3442, "classless_static_routes" }, |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 76 | { 249, RFC3442, "ms_classless_static_routes" }, |
| 77 | { 33, IPV4 | ARRAY | REQUEST, "static_routes" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 78 | { 3, IPV4 | ARRAY | REQUEST, "routers" }, |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 79 | { 2, UINT32, "time_offset" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 80 | { 4, IPV4 | ARRAY, "time_servers" }, |
| 81 | { 5, IPV4 | ARRAY, "ien116_name_servers" }, |
tk.mun | ddaa48f | 2011-11-17 21:02:01 +0900 | [diff] [blame] | 82 | /* Explicitly include DNS in the list of parameters requested in the DNS request. |
| 83 | * Without this some DHCP servers may skip the DNS entries in the DHCP replies.*/ |
| 84 | { 6, IPV4 | ARRAY | REQUEST, "domain_name_servers" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 85 | { 7, IPV4 | ARRAY, "log_servers" }, |
| 86 | { 8, IPV4 | ARRAY, "cookie_servers" }, |
| 87 | { 9, IPV4 | ARRAY, "lpr_servers" }, |
| 88 | { 10, IPV4 | ARRAY, "impress_servers" }, |
| 89 | { 11, IPV4 | ARRAY, "resource_location_servers" }, |
| 90 | { 12, STRING, "host_name" }, |
| 91 | { 13, UINT16, "boot_size" }, |
| 92 | { 14, STRING, "merit_dump" }, |
tk.mun | ddaa48f | 2011-11-17 21:02:01 +0900 | [diff] [blame] | 93 | /* Explicitly include DNS in the list of parameters requested in the DNS request. |
| 94 | * Without this some DHCP servers may skip the DNS entries in the DHCP replies.*/ |
| 95 | { 15, STRING | REQUEST, "domain_name" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 96 | { 16, IPV4, "swap_server" }, |
| 97 | { 17, STRING, "root_path" }, |
| 98 | { 18, STRING, "extensions_path" }, |
| 99 | { 19, UINT8, "ip_forwarding" }, |
| 100 | { 20, UINT8, "non_local_source_routing" }, |
| 101 | { 21, IPV4 | ARRAY, "policy_filter" }, |
| 102 | { 22, SINT16, "max_dgram_reassembly" }, |
| 103 | { 23, UINT16, "default_ip_ttl" }, |
| 104 | { 24, UINT32, "path_mtu_aging_timeout" }, |
| 105 | { 25, UINT16 | ARRAY, "path_mtu_plateau_table" }, |
| 106 | { 26, UINT16, "interface_mtu" }, |
| 107 | { 27, UINT8, "all_subnets_local" }, |
| 108 | { 28, IPV4 | REQUEST, "broadcast_address" }, |
| 109 | { 29, UINT8, "perform_mask_discovery" }, |
| 110 | { 30, UINT8, "mask_supplier" }, |
| 111 | { 31, UINT8, "router_discovery" }, |
| 112 | { 32, IPV4, "router_solicitation_address" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 113 | { 34, UINT8, "trailer_encapsulation" }, |
| 114 | { 35, UINT32, "arp_cache_timeout" }, |
| 115 | { 36, UINT16, "ieee802_3_encapsulation" }, |
| 116 | { 37, UINT8, "default_tcp_ttl" }, |
| 117 | { 38, UINT32, "tcp_keepalive_interval" }, |
| 118 | { 39, UINT8, "tcp_keepalive_garbage" }, |
| 119 | { 40, STRING, "nis_domain" }, |
| 120 | { 41, IPV4 | ARRAY, "nis_servers" }, |
| 121 | { 42, IPV4 | ARRAY, "ntp_servers" }, |
| 122 | { 43, STRING, "vendor_encapsulated_options" }, |
| 123 | { 44, IPV4 | ARRAY, "netbios_name_servers" }, |
| 124 | { 45, IPV4, "netbios_dd_server" }, |
| 125 | { 46, UINT8, "netbios_node_type" }, |
| 126 | { 47, STRING, "netbios_scope" }, |
| 127 | { 48, IPV4 | ARRAY, "font_servers" }, |
| 128 | { 49, IPV4 | ARRAY, "x_display_manager" }, |
| 129 | { 50, IPV4, "dhcp_requested_address" }, |
| 130 | { 51, UINT32 | REQUEST, "dhcp_lease_time" }, |
| 131 | { 52, UINT8, "dhcp_option_overload" }, |
| 132 | { 53, UINT8, "dhcp_message_type" }, |
| 133 | { 54, IPV4, "dhcp_server_identifier" }, |
| 134 | { 55, UINT8 | ARRAY, "dhcp_parameter_request_list" }, |
| 135 | { 56, STRING, "dhcp_message" }, |
| 136 | { 57, UINT16, "dhcp_max_message_size" }, |
| 137 | { 58, UINT32 | REQUEST, "dhcp_renewal_time" }, |
| 138 | { 59, UINT32 | REQUEST, "dhcp_rebinding_time" }, |
| 139 | { 64, STRING, "nisplus_domain" }, |
| 140 | { 65, IPV4 | ARRAY, "nisplus_servers" }, |
| 141 | { 66, STRING, "tftp_server_name" }, |
| 142 | { 67, STRING, "bootfile_name" }, |
| 143 | { 68, IPV4 | ARRAY, "mobile_ip_home_agent" }, |
| 144 | { 69, IPV4 | ARRAY, "smtp_server" }, |
| 145 | { 70, IPV4 | ARRAY, "pop_server" }, |
| 146 | { 71, IPV4 | ARRAY, "nntp_server" }, |
| 147 | { 72, IPV4 | ARRAY, "www_server" }, |
| 148 | { 73, IPV4 | ARRAY, "finger_server" }, |
| 149 | { 74, IPV4 | ARRAY, "irc_server" }, |
| 150 | { 75, IPV4 | ARRAY, "streettalk_server" }, |
| 151 | { 76, IPV4 | ARRAY, "streettalk_directory_assistance_server" }, |
| 152 | { 77, STRING, "user_class" }, |
| 153 | { 81, STRING | RFC3397, "fqdn_name" }, |
| 154 | { 85, IPV4 | ARRAY, "nds_servers" }, |
| 155 | { 86, STRING, "nds_tree_name" }, |
| 156 | { 87, STRING, "nds_context" }, |
| 157 | { 88, STRING | RFC3397, "bcms_controller_names" }, |
| 158 | { 89, IPV4 | ARRAY, "bcms_controller_address" }, |
| 159 | { 91, UINT32, "client_last_transaction_time" }, |
| 160 | { 92, IPV4 | ARRAY, "associated_ip" }, |
| 161 | { 98, STRING, "uap_servers" }, |
| 162 | { 112, IPV4 | ARRAY, "netinfo_server_address" }, |
| 163 | { 113, STRING, "netinfo_server_tag" }, |
| 164 | { 114, STRING, "default_url" }, |
| 165 | { 118, IPV4, "subnet_selection" }, |
| 166 | { 119, STRING | RFC3397, "domain_search" }, |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 167 | { 120, STRING | RFC3361, "sip_server" }, |
| 168 | { 212, RFC5969, "sixrd" }, |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 169 | { 0, 0, NULL } |
| 170 | }; |
| 171 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 172 | static const char *if_params[] = { |
| 173 | "interface", |
| 174 | "reason", |
| 175 | "pid", |
| 176 | "ifmetric", |
| 177 | "ifwireless", |
| 178 | "ifflags", |
| 179 | "profile", |
| 180 | "interface_order", |
| 181 | NULL |
| 182 | }; |
| 183 | |
| 184 | static const char *dhcp_params[] = { |
| 185 | "ip_address", |
| 186 | "subnet_cidr", |
| 187 | "network_number", |
| 188 | "ssid", |
| 189 | "filename", |
| 190 | "server_name", |
| 191 | NULL |
| 192 | }; |
| 193 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 194 | void |
| 195 | print_options(void) |
| 196 | { |
| 197 | const struct dhcp_opt *opt; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 198 | const char **p; |
| 199 | |
| 200 | for (p = if_params; *p; p++) |
| 201 | printf(" - %s\n", *p); |
| 202 | |
| 203 | for (p = dhcp_params; *p; p++) |
| 204 | printf(" %s\n", *p); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 205 | |
| 206 | for (opt = dhcp_opts; opt->option; opt++) |
| 207 | if (opt->var) |
| 208 | printf("%03d %s\n", opt->option, opt->var); |
| 209 | } |
| 210 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 211 | int make_option_mask(uint8_t *mask, const char *opts, int add) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 212 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 213 | char *token, *o, *p, *t; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 214 | const struct dhcp_opt *opt; |
| 215 | int match, n; |
| 216 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 217 | o = p = xstrdup(opts); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 218 | while ((token = strsep(&p, ", "))) { |
| 219 | if (*token == '\0') |
| 220 | continue; |
| 221 | for (opt = dhcp_opts; opt->option; opt++) { |
| 222 | if (!opt->var) |
| 223 | continue; |
| 224 | match = 0; |
| 225 | if (strcmp(opt->var, token) == 0) |
| 226 | match = 1; |
| 227 | else { |
| 228 | errno = 0; |
| 229 | n = strtol(token, &t, 0); |
| 230 | if (errno == 0 && !*t) |
| 231 | if (opt->option == n) |
| 232 | match = 1; |
| 233 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 234 | if (match) { |
| 235 | if (add == 2 && !(opt->type & IPV4)) { |
| 236 | free(o); |
| 237 | errno = EINVAL; |
| 238 | return -1; |
| 239 | } |
| 240 | if (add == 1 || add == 2) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 241 | add_option_mask(mask, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 242 | opt->option); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 243 | else |
| 244 | del_option_mask(mask, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 245 | opt->option); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 246 | break; |
| 247 | } |
| 248 | } |
| 249 | if (!opt->option) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 250 | free(o); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 251 | errno = ENOENT; |
| 252 | return -1; |
| 253 | } |
| 254 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 255 | free(o); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | static int |
| 260 | valid_length(uint8_t option, int dl, int *type) |
| 261 | { |
| 262 | const struct dhcp_opt *opt; |
| 263 | ssize_t sz; |
| 264 | |
| 265 | if (dl == 0) |
| 266 | return -1; |
| 267 | |
| 268 | for (opt = dhcp_opts; opt->option; opt++) { |
| 269 | if (opt->option != option) |
| 270 | continue; |
| 271 | |
| 272 | if (type) |
| 273 | *type = opt->type; |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 274 | /* The size of RFC3442 and RFC5969 options is checked at a later |
| 275 | * stage in the code */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 276 | if (opt->type == 0 || |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 277 | opt->type & (STRING | RFC3442 | RFC5969)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 278 | return 0; |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 279 | /* The code does not use SINT16 / SINT32 together with ARRAY. |
| 280 | * It is however far easier to reason about the code if all |
| 281 | * possible array elements are included, and also does not code |
| 282 | * any additional CPU resources. sizeof(uintXX_t) == |
| 283 | * sizeof(intXX_t) can be assumed. */ |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 284 | sz = 0; |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 285 | if (opt->type & (UINT32 | SINT32 | IPV4)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 286 | sz = sizeof(uint32_t); |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 287 | else if (opt->type & (UINT16 | SINT16)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 288 | sz = sizeof(uint16_t); |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 289 | else if (opt->type & UINT8) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 290 | sz = sizeof(uint8_t); |
Pierre Imai | 1f91339 | 2016-02-11 23:40:46 -0800 | [diff] [blame] | 291 | if (opt->type & ARRAY) { |
| 292 | /* The result of modulo zero is undefined. There are no |
| 293 | * options defined in this file that do not match one of |
| 294 | * the if-clauses above, so the following is not really |
| 295 | * necessary. However, to avoid confusion and unexpected |
| 296 | * behavior if the defined options are ever extended, |
| 297 | * returning false here seems sensible. */ |
| 298 | if (!sz) return -1; |
| 299 | return (dl % sz == 0) ? 0 : -1; |
| 300 | } |
| 301 | return (sz == dl) ? 0 : -1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | /* unknown option, so let it pass */ |
| 305 | return 0; |
| 306 | } |
| 307 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 308 | #ifdef DEBUG_MEMORY |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 309 | static void |
| 310 | free_option_buffer(void) |
| 311 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 312 | free(opt_buffer); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 313 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 314 | #endif |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 315 | |
| 316 | #define get_option_raw(dhcp, opt) get_option(dhcp, opt, NULL, NULL) |
| 317 | static const uint8_t * |
| 318 | get_option(const struct dhcp_message *dhcp, uint8_t opt, int *len, int *type) |
| 319 | { |
| 320 | const uint8_t *p = dhcp->options; |
| 321 | const uint8_t *e = p + sizeof(dhcp->options); |
| 322 | uint8_t l, ol = 0; |
| 323 | uint8_t o = 0; |
| 324 | uint8_t overl = 0; |
| 325 | uint8_t *bp = NULL; |
| 326 | const uint8_t *op = NULL; |
| 327 | int bl = 0; |
| 328 | |
Erik Kline | c1c270d | 2014-11-15 04:24:40 +0900 | [diff] [blame] | 329 | /* DHCP Options are in TLV format with T and L each being a single |
| 330 | * byte. In general, here we have p -> T, ol=p+1 -> L, op -> V. |
| 331 | * We must make sure there is enough room to read both T and L. |
| 332 | */ |
| 333 | while (p + 1 < e) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 334 | o = *p++; |
| 335 | if (o == opt) { |
| 336 | if (op) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 337 | if (!opt_buffer) { |
| 338 | opt_buffer = xmalloc(sizeof(*dhcp)); |
| 339 | #ifdef DEBUG_MEMORY |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 340 | atexit(free_option_buffer); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 341 | #endif |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 342 | } |
| 343 | if (!bp) |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 344 | bp = opt_buffer; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 345 | memcpy(bp, op, ol); |
| 346 | bp += ol; |
| 347 | } |
Erik Kline | c1c270d | 2014-11-15 04:24:40 +0900 | [diff] [blame] | 348 | ol = (p + *p < e) ? *p : e - (p + 1); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 349 | op = p + 1; |
| 350 | bl += ol; |
| 351 | } |
| 352 | switch (o) { |
| 353 | case DHO_PAD: |
| 354 | continue; |
| 355 | case DHO_END: |
| 356 | if (overl & 1) { |
| 357 | /* bit 1 set means parse boot file */ |
| 358 | overl &= ~1; |
| 359 | p = dhcp->bootfile; |
| 360 | e = p + sizeof(dhcp->bootfile); |
| 361 | } else if (overl & 2) { |
| 362 | /* bit 2 set means parse server name */ |
| 363 | overl &= ~2; |
| 364 | p = dhcp->servername; |
| 365 | e = p + sizeof(dhcp->servername); |
| 366 | } else |
| 367 | goto exit; |
| 368 | break; |
| 369 | case DHO_OPTIONSOVERLOADED: |
| 370 | /* Ensure we only get this option once */ |
| 371 | if (!overl) |
Lorenzo Colitti | de806df | 2014-08-15 17:54:06 +0900 | [diff] [blame] | 372 | overl = 0x80 | p[1]; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 373 | break; |
| 374 | } |
| 375 | l = *p++; |
| 376 | p += l; |
| 377 | } |
| 378 | |
| 379 | exit: |
| 380 | if (valid_length(opt, bl, type) == -1) { |
| 381 | errno = EINVAL; |
| 382 | return NULL; |
| 383 | } |
| 384 | if (len) |
| 385 | *len = bl; |
| 386 | if (bp) { |
| 387 | memcpy(bp, op, ol); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 388 | return (const uint8_t *)opt_buffer; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 389 | } |
| 390 | if (op) |
| 391 | return op; |
| 392 | errno = ENOENT; |
| 393 | return NULL; |
| 394 | } |
| 395 | |
| 396 | int |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 397 | get_option_addr(struct in_addr *a, const struct dhcp_message *dhcp, |
| 398 | uint8_t option) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 399 | { |
| 400 | const uint8_t *p = get_option_raw(dhcp, option); |
| 401 | |
| 402 | if (!p) |
| 403 | return -1; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 404 | memcpy(&a->s_addr, p, sizeof(a->s_addr)); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | int |
| 409 | get_option_uint32(uint32_t *i, const struct dhcp_message *dhcp, uint8_t option) |
| 410 | { |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 411 | const uint8_t *p = get_option_raw(dhcp, option); |
| 412 | uint32_t d; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 413 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 414 | if (!p) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 415 | return -1; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 416 | memcpy(&d, p, sizeof(d)); |
| 417 | *i = ntohl(d); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | int |
| 422 | get_option_uint16(uint16_t *i, const struct dhcp_message *dhcp, uint8_t option) |
| 423 | { |
| 424 | const uint8_t *p = get_option_raw(dhcp, option); |
| 425 | uint16_t d; |
| 426 | |
| 427 | if (!p) |
| 428 | return -1; |
| 429 | memcpy(&d, p, sizeof(d)); |
| 430 | *i = ntohs(d); |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | int |
| 435 | get_option_uint8(uint8_t *i, const struct dhcp_message *dhcp, uint8_t option) |
| 436 | { |
| 437 | const uint8_t *p = get_option_raw(dhcp, option); |
| 438 | |
| 439 | if (!p) |
| 440 | return -1; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 441 | if (i) |
| 442 | *i = *(p); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | /* Decode an RFC3397 DNS search order option into a space |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 447 | * separated string. Returns length of string (including |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 448 | * terminating zero) or zero on error. out may be NULL |
| 449 | * to just determine output length. */ |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 450 | ssize_t |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 451 | decode_rfc3397(char *out, ssize_t len, int pl, const uint8_t *p) |
| 452 | { |
| 453 | const uint8_t *r, *q = p; |
| 454 | int count = 0, l, hops; |
| 455 | uint8_t ltype; |
| 456 | |
| 457 | while (q - p < pl) { |
| 458 | r = NULL; |
| 459 | hops = 0; |
| 460 | /* We check we are inside our length again incase |
| 461 | * the data is NOT terminated correctly. */ |
| 462 | while ((l = *q++) && q - p < pl) { |
| 463 | ltype = l & 0xc0; |
| 464 | if (ltype == 0x80 || ltype == 0x40) |
| 465 | return 0; |
| 466 | else if (ltype == 0xc0) { /* pointer */ |
| 467 | l = (l & 0x3f) << 8; |
| 468 | l |= *q++; |
| 469 | /* save source of first jump. */ |
| 470 | if (!r) |
| 471 | r = q; |
| 472 | hops++; |
| 473 | if (hops > 255) |
| 474 | return 0; |
| 475 | q = p + l; |
| 476 | if (q - p >= pl) |
| 477 | return 0; |
| 478 | } else { |
| 479 | /* straightforward name segment, add with '.' */ |
| 480 | count += l + 1; |
| 481 | if (out) { |
| 482 | if ((ssize_t)l + 1 > len) { |
| 483 | errno = ENOBUFS; |
| 484 | return -1; |
| 485 | } |
| 486 | memcpy(out, q, l); |
| 487 | out += l; |
| 488 | *out++ = '.'; |
| 489 | len -= l; |
| 490 | len--; |
| 491 | } |
| 492 | q += l; |
| 493 | } |
| 494 | } |
| 495 | /* change last dot to space */ |
| 496 | if (out) |
| 497 | *(out - 1) = ' '; |
| 498 | if (r) |
| 499 | q = r; |
| 500 | } |
| 501 | |
| 502 | /* change last space to zero terminator */ |
| 503 | if (out) |
| 504 | *(out - 1) = 0; |
| 505 | |
| 506 | return count; |
| 507 | } |
| 508 | |
| 509 | static ssize_t |
| 510 | decode_rfc3442(char *out, ssize_t len, int pl, const uint8_t *p) |
| 511 | { |
| 512 | const uint8_t *e; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 513 | ssize_t b, bytes = 0, ocets; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 514 | uint8_t cidr; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 515 | struct in_addr addr; |
| 516 | char *o = out; |
| 517 | |
| 518 | /* Minimum is 5 -first is CIDR and a router length of 4 */ |
| 519 | if (pl < 5) { |
| 520 | errno = EINVAL; |
| 521 | return -1; |
| 522 | } |
| 523 | |
| 524 | e = p + pl; |
| 525 | while (p < e) { |
| 526 | cidr = *p++; |
| 527 | if (cidr > 32) { |
| 528 | errno = EINVAL; |
| 529 | return -1; |
| 530 | } |
| 531 | ocets = (cidr + 7) / 8; |
| 532 | if (!out) { |
| 533 | p += 4 + ocets; |
| 534 | bytes += ((4 * 4) * 2) + 4; |
| 535 | continue; |
| 536 | } |
| 537 | if ((((4 * 4) * 2) + 4) > len) { |
| 538 | errno = ENOBUFS; |
| 539 | return -1; |
| 540 | } |
| 541 | if (o != out) { |
| 542 | *o++ = ' '; |
| 543 | len--; |
| 544 | } |
| 545 | /* If we have ocets then we have a destination and netmask */ |
| 546 | if (ocets > 0) { |
| 547 | addr.s_addr = 0; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 548 | memcpy(&addr.s_addr, p, ocets); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 549 | b = snprintf(o, len, "%s/%d", inet_ntoa(addr), cidr); |
| 550 | p += ocets; |
| 551 | } else |
| 552 | b = snprintf(o, len, "0.0.0.0/0"); |
| 553 | o += b; |
| 554 | len -= b; |
| 555 | |
| 556 | /* Finally, snag the router */ |
| 557 | memcpy(&addr.s_addr, p, 4); |
| 558 | p += 4; |
| 559 | b = snprintf(o, len, " %s", inet_ntoa(addr)); |
| 560 | o += b; |
| 561 | len -= b; |
| 562 | } |
| 563 | |
| 564 | if (out) |
| 565 | return o - out; |
| 566 | return bytes; |
| 567 | } |
| 568 | |
| 569 | static struct rt * |
| 570 | decode_rfc3442_rt(int dl, const uint8_t *data) |
| 571 | { |
| 572 | const uint8_t *p = data; |
| 573 | const uint8_t *e; |
| 574 | uint8_t cidr; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 575 | size_t ocets; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 576 | struct rt *routes = NULL; |
| 577 | struct rt *rt = NULL; |
| 578 | |
| 579 | /* Minimum is 5 -first is CIDR and a router length of 4 */ |
| 580 | if (dl < 5) |
| 581 | return NULL; |
| 582 | |
| 583 | e = p + dl; |
| 584 | while (p < e) { |
| 585 | cidr = *p++; |
| 586 | if (cidr > 32) { |
| 587 | free_routes(routes); |
| 588 | errno = EINVAL; |
| 589 | return NULL; |
| 590 | } |
| 591 | |
| 592 | if (rt) { |
| 593 | rt->next = xzalloc(sizeof(*rt)); |
| 594 | rt = rt->next; |
| 595 | } else { |
| 596 | routes = rt = xzalloc(sizeof(*routes)); |
| 597 | } |
| 598 | rt->next = NULL; |
| 599 | |
| 600 | ocets = (cidr + 7) / 8; |
| 601 | /* If we have ocets then we have a destination and netmask */ |
| 602 | if (ocets > 0) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 603 | memcpy(&rt->dest.s_addr, p, ocets); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 604 | p += ocets; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 605 | rt->net.s_addr = htonl(~0U << (32 - cidr)); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 606 | } |
| 607 | |
| 608 | /* Finally, snag the router */ |
| 609 | memcpy(&rt->gate.s_addr, p, 4); |
| 610 | p += 4; |
| 611 | } |
| 612 | return routes; |
| 613 | } |
| 614 | |
| 615 | static char * |
| 616 | decode_rfc3361(int dl, const uint8_t *data) |
| 617 | { |
| 618 | uint8_t enc; |
| 619 | unsigned int l; |
| 620 | char *sip = NULL; |
| 621 | struct in_addr addr; |
| 622 | char *p; |
| 623 | |
| 624 | if (dl < 2) { |
| 625 | errno = EINVAL; |
| 626 | return 0; |
| 627 | } |
| 628 | |
| 629 | enc = *data++; |
| 630 | dl--; |
| 631 | switch (enc) { |
| 632 | case 0: |
| 633 | if ((l = decode_rfc3397(NULL, 0, dl, data)) > 0) { |
| 634 | sip = xmalloc(l); |
| 635 | decode_rfc3397(sip, l, dl, data); |
| 636 | } |
| 637 | break; |
| 638 | case 1: |
| 639 | if (dl == 0 || dl % 4 != 0) { |
| 640 | errno = EINVAL; |
| 641 | break; |
| 642 | } |
| 643 | addr.s_addr = INADDR_BROADCAST; |
| 644 | l = ((dl / sizeof(addr.s_addr)) * ((4 * 4) + 1)) + 1; |
| 645 | sip = p = xmalloc(l); |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 646 | while (dl != 0) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 647 | memcpy(&addr.s_addr, data, sizeof(addr.s_addr)); |
| 648 | data += sizeof(addr.s_addr); |
| 649 | p += snprintf(p, l - (p - sip), "%s ", inet_ntoa(addr)); |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 650 | dl -= sizeof(addr.s_addr); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 651 | } |
| 652 | *--p = '\0'; |
| 653 | break; |
| 654 | default: |
| 655 | errno = EINVAL; |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | return sip; |
| 660 | } |
| 661 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 662 | /* Decode an RFC5969 6rd order option into a space |
| 663 | * separated string. Returns length of string (including |
| 664 | * terminating zero) or zero on error. */ |
| 665 | static ssize_t |
| 666 | decode_rfc5969(char *out, ssize_t len, int pl, const uint8_t *p) |
| 667 | { |
| 668 | uint8_t ipv4masklen, ipv6prefixlen; |
| 669 | uint8_t ipv6prefix[16]; |
| 670 | uint8_t br[4]; |
| 671 | int i; |
| 672 | ssize_t b, bytes = 0; |
| 673 | |
| 674 | if (pl < 22) { |
| 675 | errno = EINVAL; |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | ipv4masklen = *p++; |
| 680 | pl--; |
| 681 | ipv6prefixlen = *p++; |
| 682 | pl--; |
| 683 | |
| 684 | for (i = 0; i < 16; i++) { |
| 685 | ipv6prefix[i] = *p++; |
| 686 | pl--; |
| 687 | } |
| 688 | if (out) { |
| 689 | b= snprintf(out, len, |
| 690 | "%d %d " |
| 691 | "%02x%02x:%02x%02x:" |
| 692 | "%02x%02x:%02x%02x:" |
| 693 | "%02x%02x:%02x%02x:" |
| 694 | "%02x%02x:%02x%02x", |
| 695 | ipv4masklen, ipv6prefixlen, |
| 696 | ipv6prefix[0], ipv6prefix[1], ipv6prefix[2], ipv6prefix[3], |
| 697 | ipv6prefix[4], ipv6prefix[5], ipv6prefix[6], ipv6prefix[7], |
| 698 | ipv6prefix[8], ipv6prefix[9], ipv6prefix[10],ipv6prefix[11], |
| 699 | ipv6prefix[12],ipv6prefix[13],ipv6prefix[14], ipv6prefix[15] |
| 700 | ); |
| 701 | |
| 702 | len -= b; |
| 703 | out += b; |
| 704 | bytes += b; |
| 705 | } else { |
| 706 | bytes += 16 * 2 + 8 + 2 + 1 + 2; |
| 707 | } |
| 708 | |
| 709 | while (pl >= 4) { |
| 710 | br[0] = *p++; |
| 711 | br[1] = *p++; |
| 712 | br[2] = *p++; |
| 713 | br[3] = *p++; |
| 714 | pl -= 4; |
| 715 | |
| 716 | if (out) { |
| 717 | b= snprintf(out, len, " %d.%d.%d.%d", |
| 718 | br[0], br[1], br[2], br[3]); |
| 719 | len -= b; |
| 720 | out += b; |
| 721 | bytes += b; |
| 722 | } else { |
| 723 | bytes += (4 * 4); |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | return bytes; |
| 728 | } |
| 729 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 730 | char * |
| 731 | get_option_string(const struct dhcp_message *dhcp, uint8_t option) |
| 732 | { |
| 733 | int type = 0; |
| 734 | int len; |
| 735 | const uint8_t *p; |
| 736 | char *s; |
| 737 | |
| 738 | p = get_option(dhcp, option, &len, &type); |
| 739 | if (!p || *p == '\0') |
| 740 | return NULL; |
| 741 | |
| 742 | if (type & RFC3397) { |
| 743 | type = decode_rfc3397(NULL, 0, len, p); |
| 744 | if (!type) { |
| 745 | errno = EINVAL; |
| 746 | return NULL; |
| 747 | } |
| 748 | s = xmalloc(sizeof(char) * type); |
| 749 | decode_rfc3397(s, type, len, p); |
| 750 | return s; |
| 751 | } |
| 752 | |
| 753 | if (type & RFC3361) |
| 754 | return decode_rfc3361(len, p); |
| 755 | |
| 756 | s = xmalloc(sizeof(char) * (len + 1)); |
| 757 | memcpy(s, p, len); |
| 758 | s[len] = '\0'; |
| 759 | return s; |
| 760 | } |
| 761 | |
| 762 | /* This calculates the netmask that we should use for static routes. |
| 763 | * This IS different from the calculation used to calculate the netmask |
| 764 | * for an interface address. */ |
| 765 | static uint32_t |
| 766 | route_netmask(uint32_t ip_in) |
| 767 | { |
| 768 | /* used to be unsigned long - check if error */ |
| 769 | uint32_t p = ntohl(ip_in); |
| 770 | uint32_t t; |
| 771 | |
| 772 | if (IN_CLASSA(p)) |
| 773 | t = ~IN_CLASSA_NET; |
| 774 | else { |
| 775 | if (IN_CLASSB(p)) |
| 776 | t = ~IN_CLASSB_NET; |
| 777 | else { |
| 778 | if (IN_CLASSC(p)) |
| 779 | t = ~IN_CLASSC_NET; |
| 780 | else |
| 781 | t = 0; |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | while (t & p) |
| 786 | t >>= 1; |
| 787 | |
| 788 | return (htonl(~t)); |
| 789 | } |
| 790 | |
| 791 | /* We need to obey routing options. |
| 792 | * If we have a CSR then we only use that. |
| 793 | * Otherwise we add static routes and then routers. */ |
| 794 | struct rt * |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 795 | get_option_routes(const struct dhcp_message *dhcp, |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 796 | const char *ifname, unsigned long long *opts) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 797 | { |
| 798 | const uint8_t *p; |
| 799 | const uint8_t *e; |
| 800 | struct rt *routes = NULL; |
| 801 | struct rt *route = NULL; |
| 802 | int len; |
| 803 | |
| 804 | /* If we have CSR's then we MUST use these only */ |
| 805 | p = get_option(dhcp, DHO_CSR, &len, NULL); |
| 806 | /* Check for crappy MS option */ |
| 807 | if (!p) |
| 808 | p = get_option(dhcp, DHO_MSCSR, &len, NULL); |
| 809 | if (p) { |
| 810 | routes = decode_rfc3442_rt(len, p); |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 811 | if (routes) { |
| 812 | if (!(*opts & DHCPCD_CSR_WARNED)) { |
| 813 | syslog(LOG_DEBUG, |
| 814 | "%s: using Classless Static Routes", |
| 815 | ifname); |
| 816 | *opts |= DHCPCD_CSR_WARNED; |
| 817 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 818 | return routes; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 819 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 820 | } |
| 821 | |
| 822 | /* OK, get our static routes first. */ |
| 823 | p = get_option(dhcp, DHO_STATICROUTE, &len, NULL); |
| 824 | if (p) { |
| 825 | e = p + len; |
| 826 | while (p < e) { |
| 827 | if (route) { |
| 828 | route->next = xmalloc(sizeof(*route)); |
| 829 | route = route->next; |
| 830 | } else |
| 831 | routes = route = xmalloc(sizeof(*routes)); |
| 832 | route->next = NULL; |
| 833 | memcpy(&route->dest.s_addr, p, 4); |
| 834 | p += 4; |
| 835 | memcpy(&route->gate.s_addr, p, 4); |
| 836 | p += 4; |
| 837 | route->net.s_addr = route_netmask(route->dest.s_addr); |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | /* Now grab our routers */ |
| 842 | p = get_option(dhcp, DHO_ROUTER, &len, NULL); |
| 843 | if (p) { |
| 844 | e = p + len; |
| 845 | while (p < e) { |
| 846 | if (route) { |
| 847 | route->next = xzalloc(sizeof(*route)); |
| 848 | route = route->next; |
| 849 | } else |
| 850 | routes = route = xzalloc(sizeof(*route)); |
| 851 | memcpy(&route->gate.s_addr, p, 4); |
| 852 | p += 4; |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | return routes; |
| 857 | } |
| 858 | |
| 859 | static size_t |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 860 | encode_rfc1035(const char *src, uint8_t *dst) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 861 | { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 862 | uint8_t *p = dst; |
| 863 | uint8_t *lp = p++; |
| 864 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 865 | if (*src == '\0') |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 866 | return 0; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 867 | for (; *src; src++) { |
| 868 | if (*src == '\0') |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 869 | break; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 870 | if (*src == '.') { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 871 | /* Skip the trailing . */ |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 872 | if (src[1] == '\0') |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 873 | break; |
| 874 | *lp = p - lp - 1; |
| 875 | if (*lp == '\0') |
| 876 | return p - dst; |
| 877 | lp = p++; |
| 878 | } else |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 879 | *p++ = (uint8_t)*src; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 880 | } |
| 881 | *lp = p - lp - 1; |
| 882 | *p++ = '\0'; |
| 883 | return p - dst; |
| 884 | } |
| 885 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 886 | #define PUTADDR(_type, _val) \ |
| 887 | { \ |
| 888 | *p++ = _type; \ |
| 889 | *p++ = 4; \ |
| 890 | memcpy(p, &_val.s_addr, 4); \ |
| 891 | p += 4; \ |
| 892 | } |
| 893 | |
| 894 | int |
| 895 | dhcp_message_add_addr(struct dhcp_message *dhcp, |
| 896 | uint8_t type, struct in_addr addr) |
| 897 | { |
| 898 | uint8_t *p; |
| 899 | size_t len; |
| 900 | |
| 901 | p = dhcp->options; |
| 902 | while (*p != DHO_END) { |
| 903 | p++; |
| 904 | p += *p + 1; |
| 905 | } |
| 906 | |
| 907 | len = p - (uint8_t *)dhcp; |
| 908 | if (len + 6 > sizeof(*dhcp)) { |
| 909 | errno = ENOMEM; |
| 910 | return -1; |
| 911 | } |
| 912 | |
| 913 | PUTADDR(type, addr); |
| 914 | *p = DHO_END; |
| 915 | return 0; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 916 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 917 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 918 | ssize_t |
| 919 | make_message(struct dhcp_message **message, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 920 | const struct interface *iface, |
| 921 | uint8_t type) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 922 | { |
| 923 | struct dhcp_message *dhcp; |
| 924 | uint8_t *m, *lp, *p; |
| 925 | uint8_t *n_params = NULL; |
| 926 | time_t up = uptime() - iface->start_uptime; |
| 927 | uint32_t ul; |
| 928 | uint16_t sz; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 929 | size_t len; |
| 930 | const char *hp; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 931 | const struct dhcp_opt *opt; |
| 932 | const struct if_options *ifo = iface->state->options; |
| 933 | const struct dhcp_lease *lease = &iface->state->lease; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 934 | |
| 935 | dhcp = xzalloc(sizeof (*dhcp)); |
| 936 | m = (uint8_t *)dhcp; |
| 937 | p = dhcp->options; |
| 938 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 939 | if ((type == DHCP_INFORM || type == DHCP_RELEASE || |
| 940 | (type == DHCP_REQUEST && |
| 941 | iface->net.s_addr == lease->net.s_addr && |
| 942 | (iface->state->new == NULL || |
| 943 | iface->state->new->cookie == htonl(MAGIC_COOKIE))))) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 944 | { |
| 945 | dhcp->ciaddr = iface->addr.s_addr; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 946 | /* In-case we haven't actually configured the address yet */ |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 947 | if (type == DHCP_INFORM && iface->addr.s_addr == 0) |
| 948 | dhcp->ciaddr = lease->addr.s_addr; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | dhcp->op = DHCP_BOOTREQUEST; |
| 952 | dhcp->hwtype = iface->family; |
| 953 | switch (iface->family) { |
| 954 | case ARPHRD_ETHER: |
| 955 | case ARPHRD_IEEE802: |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 956 | dhcp->hwlen = iface->hwlen; |
| 957 | memcpy(&dhcp->chaddr, &iface->hwaddr, iface->hwlen); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 958 | break; |
| 959 | } |
| 960 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 961 | if (ifo->options & DHCPCD_BROADCAST && |
| 962 | dhcp->ciaddr == 0 && |
| 963 | type != DHCP_DECLINE && |
| 964 | type != DHCP_RELEASE) |
| 965 | dhcp->flags = htons(BROADCAST_FLAG); |
| 966 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 967 | if (type != DHCP_DECLINE && type != DHCP_RELEASE) { |
| 968 | if (up < 0 || up > (time_t)UINT16_MAX) |
| 969 | dhcp->secs = htons((uint16_t)UINT16_MAX); |
| 970 | else |
| 971 | dhcp->secs = htons(up); |
| 972 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 973 | dhcp->xid = iface->state->xid; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 974 | dhcp->cookie = htonl(MAGIC_COOKIE); |
| 975 | |
| 976 | *p++ = DHO_MESSAGETYPE; |
| 977 | *p++ = 1; |
| 978 | *p++ = type; |
| 979 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 980 | if (iface->clientid) { |
| 981 | *p++ = DHO_CLIENTID; |
| 982 | memcpy(p, iface->clientid, iface->clientid[0] + 1); |
| 983 | p += iface->clientid[0] + 1; |
| 984 | } |
| 985 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 986 | if (lease->addr.s_addr && lease->cookie == htonl(MAGIC_COOKIE)) { |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 987 | if (type == DHCP_DECLINE || |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 988 | (type == DHCP_REQUEST && |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 989 | lease->addr.s_addr != iface->addr.s_addr)) |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 990 | { |
| 991 | PUTADDR(DHO_IPADDRESS, lease->addr); |
| 992 | if (lease->server.s_addr) |
| 993 | PUTADDR(DHO_SERVERID, lease->server); |
| 994 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 995 | |
| 996 | if (type == DHCP_RELEASE) { |
| 997 | if (lease->server.s_addr) |
| 998 | PUTADDR(DHO_SERVERID, lease->server); |
| 999 | } |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | if (type == DHCP_DECLINE) { |
| 1003 | *p++ = DHO_MESSAGE; |
| 1004 | len = strlen(DAD); |
| 1005 | *p++ = len; |
| 1006 | memcpy(p, DAD, len); |
| 1007 | p += len; |
| 1008 | } |
| 1009 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1010 | if (type == DHCP_DISCOVER && ifo->options & DHCPCD_REQUEST) |
| 1011 | PUTADDR(DHO_IPADDRESS, ifo->req_addr); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1012 | |
| 1013 | if (type == DHCP_DISCOVER || |
| 1014 | type == DHCP_INFORM || |
| 1015 | type == DHCP_REQUEST) |
| 1016 | { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1017 | *p++ = DHO_MAXMESSAGESIZE; |
| 1018 | *p++ = 2; |
| 1019 | sz = get_mtu(iface->name); |
| 1020 | if (sz < MTU_MIN) { |
| 1021 | if (set_mtu(iface->name, MTU_MIN) == 0) |
| 1022 | sz = MTU_MIN; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1023 | } else if (sz > MTU_MAX) { |
| 1024 | /* Even though our MTU could be greater than |
| 1025 | * MTU_MAX (1500) dhcpcd does not presently |
| 1026 | * handle DHCP packets any bigger. */ |
| 1027 | sz = MTU_MAX; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1028 | } |
| 1029 | sz = htons(sz); |
| 1030 | memcpy(p, &sz, 2); |
| 1031 | p += 2; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1032 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1033 | if (ifo->userclass[0]) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1034 | *p++ = DHO_USERCLASS; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1035 | memcpy(p, ifo->userclass, ifo->userclass[0] + 1); |
| 1036 | p += ifo->userclass[0] + 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1037 | } |
| 1038 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1039 | if (ifo->vendorclassid[0]) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1040 | *p++ = DHO_VENDORCLASSID; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1041 | memcpy(p, ifo->vendorclassid, |
| 1042 | ifo->vendorclassid[0] + 1); |
| 1043 | p += ifo->vendorclassid[0] + 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1044 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1045 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1046 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1047 | if (type != DHCP_INFORM) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1048 | if (ifo->leasetime != 0) { |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1049 | *p++ = DHO_LEASETIME; |
| 1050 | *p++ = 4; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1051 | ul = htonl(ifo->leasetime); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1052 | memcpy(p, &ul, 4); |
| 1053 | p += 4; |
| 1054 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1055 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1056 | |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1057 | /* Regardless of RFC2132, we should always send a hostname |
| 1058 | * upto the first dot (the short hostname) as otherwise |
| 1059 | * confuses some DHCP servers when updating DNS. |
| 1060 | * The FQDN option should be used if a FQDN is required. */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1061 | if (ifo->options & DHCPCD_HOSTNAME && ifo->hostname[0]) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1062 | *p++ = DHO_HOSTNAME; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1063 | hp = strchr(ifo->hostname, '.'); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1064 | if (hp) |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1065 | len = hp - ifo->hostname; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1066 | else |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1067 | len = strlen(ifo->hostname); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1068 | *p++ = len; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1069 | memcpy(p, ifo->hostname, len); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1070 | p += len; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1071 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1072 | if (ifo->fqdn != FQDN_DISABLE && ifo->hostname[0]) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1073 | /* IETF DHC-FQDN option (81), RFC4702 */ |
| 1074 | *p++ = DHO_FQDN; |
| 1075 | lp = p; |
| 1076 | *p++ = 3; |
| 1077 | /* |
| 1078 | * Flags: 0000NEOS |
| 1079 | * S: 1 => Client requests Server to update |
| 1080 | * a RR in DNS as well as PTR |
| 1081 | * O: 1 => Server indicates to client that |
| 1082 | * DNS has been updated |
| 1083 | * E: 1 => Name data is DNS format |
| 1084 | * N: 1 => Client requests Server to not |
| 1085 | * update DNS |
| 1086 | */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1087 | *p++ = (ifo->fqdn & 0x09) | 0x04; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1088 | *p++ = 0; /* from server for PTR RR */ |
| 1089 | *p++ = 0; /* from server for A RR if S=1 */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1090 | ul = encode_rfc1035(ifo->hostname, p); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1091 | *lp += ul; |
| 1092 | p += ul; |
| 1093 | } |
| 1094 | |
| 1095 | /* vendor is already encoded correctly, so just add it */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1096 | if (ifo->vendor[0]) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1097 | *p++ = DHO_VENDOR; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1098 | memcpy(p, ifo->vendor, ifo->vendor[0] + 1); |
| 1099 | p += ifo->vendor[0] + 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1100 | } |
| 1101 | |
| 1102 | *p++ = DHO_PARAMETERREQUESTLIST; |
| 1103 | n_params = p; |
| 1104 | *p++ = 0; |
| 1105 | for (opt = dhcp_opts; opt->option; opt++) { |
| 1106 | if (!(opt->type & REQUEST || |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1107 | has_option_mask(ifo->requestmask, opt->option))) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1108 | continue; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1109 | if (type == DHCP_INFORM && |
| 1110 | (opt->option == DHO_RENEWALTIME || |
| 1111 | opt->option == DHO_REBINDTIME)) |
| 1112 | continue; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1113 | *p++ = opt->option; |
| 1114 | } |
| 1115 | *n_params = p - n_params - 1; |
| 1116 | } |
| 1117 | *p++ = DHO_END; |
| 1118 | |
| 1119 | #ifdef BOOTP_MESSAGE_LENTH_MIN |
| 1120 | /* Some crappy DHCP servers think they have to obey the BOOTP minimum |
| 1121 | * message length. |
| 1122 | * They are wrong, but we should still cater for them. */ |
| 1123 | while (p - m < BOOTP_MESSAGE_LENTH_MIN) |
| 1124 | *p++ = DHO_PAD; |
| 1125 | #endif |
| 1126 | |
| 1127 | *message = dhcp; |
| 1128 | return p - m; |
| 1129 | } |
| 1130 | |
| 1131 | ssize_t |
| 1132 | write_lease(const struct interface *iface, const struct dhcp_message *dhcp) |
| 1133 | { |
| 1134 | int fd; |
| 1135 | ssize_t bytes = sizeof(*dhcp); |
| 1136 | const uint8_t *p = dhcp->options; |
| 1137 | const uint8_t *e = p + sizeof(dhcp->options); |
| 1138 | uint8_t l; |
| 1139 | uint8_t o = 0; |
| 1140 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1141 | /* We don't write BOOTP leases */ |
| 1142 | if (is_bootp(dhcp)) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1143 | unlink(iface->leasefile); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1144 | return 0; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1145 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1146 | |
| 1147 | syslog(LOG_DEBUG, "%s: writing lease `%s'", |
| 1148 | iface->name, iface->leasefile); |
| 1149 | |
| 1150 | fd = open(iface->leasefile, O_WRONLY | O_CREAT | O_TRUNC, 0444); |
Dmitry Shmidt | 0545fad | 2011-01-24 16:42:36 -0800 | [diff] [blame] | 1151 | #ifdef ANDROID |
| 1152 | if (fd == -1 && errno == EACCES) { |
| 1153 | /* the lease file might have been created when dhcpcd was running as root */ |
| 1154 | unlink(iface->leasefile); |
| 1155 | fd = open(iface->leasefile, O_WRONLY | O_CREAT | O_TRUNC, 0444); |
| 1156 | } |
| 1157 | #endif |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1158 | if (fd == -1) { |
| 1159 | syslog(LOG_ERR, "%s: open: %m", iface->name); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1160 | return -1; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1161 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1162 | |
| 1163 | /* Only write as much as we need */ |
| 1164 | while (p < e) { |
| 1165 | o = *p; |
| 1166 | if (o == DHO_END) { |
| 1167 | bytes = p - (const uint8_t *)dhcp; |
| 1168 | break; |
| 1169 | } |
| 1170 | p++; |
| 1171 | if (o != DHO_PAD) { |
| 1172 | l = *p++; |
| 1173 | p += l; |
| 1174 | } |
| 1175 | } |
| 1176 | bytes = write(fd, dhcp, bytes); |
| 1177 | close(fd); |
| 1178 | return bytes; |
| 1179 | } |
| 1180 | |
| 1181 | struct dhcp_message * |
| 1182 | read_lease(const struct interface *iface) |
| 1183 | { |
| 1184 | int fd; |
| 1185 | struct dhcp_message *dhcp; |
| 1186 | ssize_t bytes; |
| 1187 | |
| 1188 | fd = open(iface->leasefile, O_RDONLY); |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1189 | if (fd == -1) { |
| 1190 | if (errno != ENOENT) |
| 1191 | syslog(LOG_ERR, "%s: open `%s': %m", |
| 1192 | iface->name, iface->leasefile); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1193 | return NULL; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1194 | } |
| 1195 | syslog(LOG_DEBUG, "%s: reading lease `%s'", |
| 1196 | iface->name, iface->leasefile); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1197 | dhcp = xmalloc(sizeof(*dhcp)); |
| 1198 | memset(dhcp, 0, sizeof(*dhcp)); |
| 1199 | bytes = read(fd, dhcp, sizeof(*dhcp)); |
| 1200 | close(fd); |
| 1201 | if (bytes < 0) { |
| 1202 | free(dhcp); |
| 1203 | dhcp = NULL; |
| 1204 | } |
| 1205 | return dhcp; |
| 1206 | } |
| 1207 | |
| 1208 | static ssize_t |
| 1209 | print_string(char *s, ssize_t len, int dl, const uint8_t *data) |
| 1210 | { |
| 1211 | uint8_t c; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1212 | const uint8_t *e, *p; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1213 | ssize_t bytes = 0; |
| 1214 | ssize_t r; |
| 1215 | |
| 1216 | e = data + dl; |
| 1217 | while (data < e) { |
| 1218 | c = *data++; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1219 | if (c == '\0') { |
| 1220 | /* If rest is all NULL, skip it. */ |
| 1221 | for (p = data; p < e; p++) |
| 1222 | if (*p != '\0') |
| 1223 | break; |
| 1224 | if (p == e) |
| 1225 | break; |
| 1226 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1227 | if (!isascii(c) || !isprint(c)) { |
| 1228 | if (s) { |
| 1229 | if (len < 5) { |
| 1230 | errno = ENOBUFS; |
| 1231 | return -1; |
| 1232 | } |
| 1233 | r = snprintf(s, len, "\\%03o", c); |
| 1234 | len -= r; |
| 1235 | bytes += r; |
| 1236 | s += r; |
| 1237 | } else |
| 1238 | bytes += 4; |
| 1239 | continue; |
| 1240 | } |
| 1241 | switch (c) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1242 | case '"': /* FALLTHROUGH */ |
| 1243 | case '\'': /* FALLTHROUGH */ |
| 1244 | case '$': /* FALLTHROUGH */ |
| 1245 | case '`': /* FALLTHROUGH */ |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 1246 | case '\\': /* FALLTHROUGH */ |
| 1247 | case '|': /* FALLTHROUGH */ |
| 1248 | case '&': |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1249 | if (s) { |
| 1250 | if (len < 3) { |
| 1251 | errno = ENOBUFS; |
| 1252 | return -1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1253 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1254 | *s++ = '\\'; |
| 1255 | len--; |
| 1256 | } |
| 1257 | bytes++; |
| 1258 | break; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1259 | } |
| 1260 | if (s) { |
| 1261 | *s++ = c; |
| 1262 | len--; |
| 1263 | } |
| 1264 | bytes++; |
| 1265 | } |
| 1266 | |
| 1267 | /* NULL */ |
| 1268 | if (s) |
| 1269 | *s = '\0'; |
| 1270 | bytes++; |
| 1271 | return bytes; |
| 1272 | } |
| 1273 | |
| 1274 | static ssize_t |
| 1275 | print_option(char *s, ssize_t len, int type, int dl, const uint8_t *data) |
| 1276 | { |
| 1277 | const uint8_t *e, *t; |
| 1278 | uint16_t u16; |
| 1279 | int16_t s16; |
| 1280 | uint32_t u32; |
| 1281 | int32_t s32; |
| 1282 | struct in_addr addr; |
| 1283 | ssize_t bytes = 0; |
| 1284 | ssize_t l; |
| 1285 | char *tmp; |
| 1286 | |
| 1287 | if (type & RFC3397) { |
| 1288 | l = decode_rfc3397(NULL, 0, dl, data); |
| 1289 | if (l < 1) |
| 1290 | return l; |
| 1291 | tmp = xmalloc(l); |
| 1292 | decode_rfc3397(tmp, l, dl, data); |
| 1293 | l = print_string(s, len, l - 1, (uint8_t *)tmp); |
| 1294 | free(tmp); |
| 1295 | return l; |
| 1296 | } |
| 1297 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 1298 | if (type & RFC3361) { |
| 1299 | if ((tmp = decode_rfc3361(dl, data)) == NULL) |
| 1300 | return -1; |
| 1301 | l = strlen(tmp); |
| 1302 | l = print_string(s, len, l - 1, (uint8_t *)tmp); |
| 1303 | free(tmp); |
| 1304 | return l; |
| 1305 | } |
| 1306 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1307 | if (type & RFC3442) |
| 1308 | return decode_rfc3442(s, len, dl, data); |
| 1309 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 1310 | if (type & RFC5969) |
| 1311 | return decode_rfc5969(s, len, dl, data); |
| 1312 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1313 | if (type & STRING) { |
| 1314 | /* Some DHCP servers return NULL strings */ |
| 1315 | if (*data == '\0') |
| 1316 | return 0; |
| 1317 | return print_string(s, len, dl, data); |
| 1318 | } |
| 1319 | |
| 1320 | if (!s) { |
| 1321 | if (type & UINT8) |
| 1322 | l = 3; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1323 | else if (type & UINT16) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1324 | l = 5; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1325 | dl /= 2; |
| 1326 | } else if (type & SINT16) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1327 | l = 6; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1328 | dl /= 2; |
| 1329 | } else if (type & UINT32) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1330 | l = 10; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1331 | dl /= 4; |
| 1332 | } else if (type & SINT32) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1333 | l = 11; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1334 | dl /= 4; |
| 1335 | } else if (type & IPV4) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1336 | l = 16; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1337 | dl /= 4; |
| 1338 | } else { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1339 | errno = EINVAL; |
| 1340 | return -1; |
| 1341 | } |
| 1342 | return (l + 1) * dl; |
| 1343 | } |
| 1344 | |
| 1345 | t = data; |
| 1346 | e = data + dl; |
| 1347 | while (data < e) { |
| 1348 | if (data != t) { |
| 1349 | *s++ = ' '; |
| 1350 | bytes++; |
| 1351 | len--; |
| 1352 | } |
| 1353 | if (type & UINT8) { |
| 1354 | l = snprintf(s, len, "%d", *data); |
| 1355 | data++; |
| 1356 | } else if (type & UINT16) { |
| 1357 | memcpy(&u16, data, sizeof(u16)); |
| 1358 | u16 = ntohs(u16); |
| 1359 | l = snprintf(s, len, "%d", u16); |
| 1360 | data += sizeof(u16); |
| 1361 | } else if (type & SINT16) { |
| 1362 | memcpy(&s16, data, sizeof(s16)); |
| 1363 | s16 = ntohs(s16); |
| 1364 | l = snprintf(s, len, "%d", s16); |
| 1365 | data += sizeof(s16); |
| 1366 | } else if (type & UINT32) { |
| 1367 | memcpy(&u32, data, sizeof(u32)); |
| 1368 | u32 = ntohl(u32); |
| 1369 | l = snprintf(s, len, "%d", u32); |
| 1370 | data += sizeof(u32); |
| 1371 | } else if (type & SINT32) { |
| 1372 | memcpy(&s32, data, sizeof(s32)); |
| 1373 | s32 = ntohl(s32); |
| 1374 | l = snprintf(s, len, "%d", s32); |
| 1375 | data += sizeof(s32); |
| 1376 | } else if (type & IPV4) { |
| 1377 | memcpy(&addr.s_addr, data, sizeof(addr.s_addr)); |
| 1378 | l = snprintf(s, len, "%s", inet_ntoa(addr)); |
| 1379 | data += sizeof(addr.s_addr); |
| 1380 | } else |
| 1381 | l = 0; |
Erik Kline | c1c270d | 2014-11-15 04:24:40 +0900 | [diff] [blame] | 1382 | if (len <= l) { |
| 1383 | bytes += len; |
| 1384 | break; |
| 1385 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1386 | len -= l; |
| 1387 | bytes += l; |
| 1388 | s += l; |
| 1389 | } |
| 1390 | |
| 1391 | return bytes; |
| 1392 | } |
| 1393 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1394 | ssize_t |
| 1395 | configure_env(char **env, const char *prefix, const struct dhcp_message *dhcp, |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1396 | const struct if_options *ifo) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1397 | { |
| 1398 | unsigned int i; |
| 1399 | const uint8_t *p; |
| 1400 | int pl; |
| 1401 | struct in_addr addr; |
| 1402 | struct in_addr net; |
| 1403 | struct in_addr brd; |
| 1404 | char *val, *v; |
| 1405 | const struct dhcp_opt *opt; |
| 1406 | ssize_t len, e = 0; |
| 1407 | char **ep; |
| 1408 | char cidr[4]; |
| 1409 | uint8_t overl = 0; |
| 1410 | |
| 1411 | get_option_uint8(&overl, dhcp, DHO_OPTIONSOVERLOADED); |
| 1412 | |
| 1413 | if (!env) { |
| 1414 | for (opt = dhcp_opts; opt->option; opt++) { |
| 1415 | if (!opt->var) |
| 1416 | continue; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1417 | if (has_option_mask(ifo->nomask, opt->option)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1418 | continue; |
| 1419 | if (get_option_raw(dhcp, opt->option)) |
| 1420 | e++; |
| 1421 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1422 | if (dhcp->yiaddr || dhcp->ciaddr) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1423 | e += 5; |
| 1424 | if (*dhcp->bootfile && !(overl & 1)) |
| 1425 | e++; |
| 1426 | if (*dhcp->servername && !(overl & 2)) |
| 1427 | e++; |
| 1428 | return e; |
| 1429 | } |
| 1430 | |
| 1431 | ep = env; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1432 | if (dhcp->yiaddr || dhcp->ciaddr) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1433 | /* Set some useful variables that we derive from the DHCP |
| 1434 | * message but are not necessarily in the options */ |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1435 | addr.s_addr = dhcp->yiaddr ? dhcp->yiaddr : dhcp->ciaddr; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1436 | setvar(&ep, prefix, "ip_address", inet_ntoa(addr)); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1437 | if (get_option_addr(&net, dhcp, DHO_SUBNETMASK) == -1) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1438 | net.s_addr = get_netmask(addr.s_addr); |
| 1439 | setvar(&ep, prefix, "subnet_mask", inet_ntoa(net)); |
| 1440 | } |
| 1441 | i = inet_ntocidr(net); |
| 1442 | snprintf(cidr, sizeof(cidr), "%d", inet_ntocidr(net)); |
| 1443 | setvar(&ep, prefix, "subnet_cidr", cidr); |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1444 | if (get_option_addr(&brd, dhcp, DHO_BROADCAST) == -1) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1445 | brd.s_addr = addr.s_addr | ~net.s_addr; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 1446 | setvar(&ep, prefix, "broadcast_address", inet_ntoa(brd)); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1447 | } |
| 1448 | addr.s_addr = dhcp->yiaddr & net.s_addr; |
| 1449 | setvar(&ep, prefix, "network_number", inet_ntoa(addr)); |
| 1450 | } |
| 1451 | |
| 1452 | if (*dhcp->bootfile && !(overl & 1)) |
| 1453 | setvar(&ep, prefix, "filename", (const char *)dhcp->bootfile); |
| 1454 | if (*dhcp->servername && !(overl & 2)) |
| 1455 | setvar(&ep, prefix, "server_name", (const char *)dhcp->servername); |
| 1456 | |
| 1457 | for (opt = dhcp_opts; opt->option; opt++) { |
| 1458 | if (!opt->var) |
| 1459 | continue; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1460 | if (has_option_mask(ifo->nomask, opt->option)) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1461 | continue; |
| 1462 | val = NULL; |
| 1463 | p = get_option(dhcp, opt->option, &pl, NULL); |
| 1464 | if (!p) |
| 1465 | continue; |
| 1466 | /* We only want the FQDN name */ |
| 1467 | if (opt->option == DHO_FQDN) { |
| 1468 | p += 3; |
| 1469 | pl -= 3; |
| 1470 | } |
| 1471 | len = print_option(NULL, 0, opt->type, pl, p); |
| 1472 | if (len < 0) |
| 1473 | return -1; |
| 1474 | e = strlen(prefix) + strlen(opt->var) + len + 4; |
| 1475 | v = val = *ep++ = xmalloc(e); |
| 1476 | v += snprintf(val, e, "%s_%s=", prefix, opt->var); |
| 1477 | if (len != 0) |
| 1478 | print_option(v, len, opt->type, pl, p); |
| 1479 | } |
| 1480 | |
| 1481 | return ep - env; |
| 1482 | } |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 1483 | |
| 1484 | void |
| 1485 | get_lease(struct dhcp_lease *lease, const struct dhcp_message *dhcp) |
| 1486 | { |
| 1487 | struct timeval now; |
| 1488 | |
| 1489 | lease->cookie = dhcp->cookie; |
| 1490 | /* BOOTP does not set yiaddr for replies when ciaddr is set. */ |
| 1491 | if (dhcp->yiaddr) |
| 1492 | lease->addr.s_addr = dhcp->yiaddr; |
| 1493 | else |
| 1494 | lease->addr.s_addr = dhcp->ciaddr; |
| 1495 | if (get_option_addr(&lease->net, dhcp, DHO_SUBNETMASK) == -1) |
| 1496 | lease->net.s_addr = get_netmask(lease->addr.s_addr); |
| 1497 | if (get_option_addr(&lease->brd, dhcp, DHO_BROADCAST) == -1) |
| 1498 | lease->brd.s_addr = lease->addr.s_addr | ~lease->net.s_addr; |
| 1499 | if (get_option_uint32(&lease->leasetime, dhcp, DHO_LEASETIME) == 0) { |
| 1500 | /* Ensure that we can use the lease */ |
| 1501 | get_monotonic(&now); |
| 1502 | if (now.tv_sec + (time_t)lease->leasetime < now.tv_sec) |
| 1503 | lease->leasetime = ~0U; /* Infinite lease */ |
| 1504 | } else |
| 1505 | lease->leasetime = ~0U; /* Default to infinite lease */ |
| 1506 | if (get_option_uint32(&lease->renewaltime, dhcp, DHO_RENEWALTIME) != 0) |
| 1507 | lease->renewaltime = 0; |
| 1508 | if (get_option_uint32(&lease->rebindtime, dhcp, DHO_REBINDTIME) != 0) |
| 1509 | lease->rebindtime = 0; |
| 1510 | if (get_option_addr(&lease->server, dhcp, DHO_SERVERID) != 0) |
| 1511 | lease->server.s_addr = INADDR_ANY; |
| 1512 | } |