config.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include <uci.h>
   6
   7 #include "netifd.h"
   8 #include "interface.h"
   9 #include "interface-ip.h"
  10 #include "proto.h"
  11 #include "config.h"
  12
  13 bool config_init = false;
  14
  15 static struct uci_context *uci_ctx;
  16 static struct uci_package *uci_network;
  17 static struct blob_buf b;
  18
  19 static void uci_attr_to_blob(struct blob_buf *b, const char *str,
  20                              const char *name, enum blobmsg_type type)
  21 {
  22         char *err;
  23         int intval;
  24
  25         switch (type) {
  26         case BLOBMSG_TYPE_STRING:
  27                 blobmsg_add_string(b, name, str);
  28                 break;
  29         case BLOBMSG_TYPE_BOOL:
  30                 if (!strcmp(str, "true") || !strcmp(str, "1"))
  31                         intval = 1;
  32                 else if (!strcmp(str, "false") || !strcmp(str, "0"))
  33                         intval = 0;
  34                 else
  35                         return;
  36
  37                 blobmsg_add_u8(b, name, intval);
  38                 break;
  39         case BLOBMSG_TYPE_INT32:
  40                 intval = strtol(str, &err, 0);
  41                 if (*err)
  42                         return;
  43
  44                 blobmsg_add_u32(b, name, intval);
  45                 break;
  46         default:
  47                 break;
  48         }
  49 }
  50
  51 static void uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
  52                               enum blobmsg_type type)
  53 {
  54         struct uci_element *e;
  55         char *str, *next, *word;
  56
  57         if (o->type == UCI_TYPE_LIST) {
  58                 uci_foreach_element(&o->v.list, e) {
  59                         uci_attr_to_blob(b, e->name, NULL, type);
  60                 }
  61                 return;
  62         }
  63
  64         str = strdup(o->v.string);
  65         next = str;
  66
  67         while ((word = strsep(&next, " \t")) != NULL) {
  68                 if (!*word)
  69                         continue;
  70
  71                 uci_attr_to_blob(b, word, NULL, type);
  72         }
  73
  74         free(str);
  75 }
  76
  77 static void __uci_to_blob(struct blob_buf *b, struct uci_section *s,
  78                           const struct config_param_list *p)
  79 {
  80         const struct blobmsg_policy *attr = NULL;
  81         struct uci_element *e;
  82         struct uci_option *o;
  83         void *array;
  84         int i;
  85
  86         uci_foreach_element(&s->options, e) {
  87                 for (i = 0; i < p->n_params; i++) {
  88                         attr = &p->params[i];
  89                         if (!strcmp(attr->name, e->name))
  90                                 break;
  91                 }
  92
  93                 if (i == p->n_params)
  94                         continue;
  95
  96                 o = uci_to_option(e);
  97
  98                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
  99                         if (!p->info)
 100                                 continue;
 101
 102                         array = blobmsg_open_array(b, attr->name);
 103                         uci_array_to_blob(b, o, p->info[i].type);
 104                         blobmsg_close_array(b, array);
 105                         continue;
 106                 }
 107
 108                 if (o->type == UCI_TYPE_LIST)
 109                         continue;
 110
 111                 uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 112         }
 113 }
 114
 115 static void uci_to_blob(struct blob_buf *b, struct uci_section *s,
 116                         const struct config_param_list *p)
 117 {
 118         int i;
 119
 120         __uci_to_blob(b, s, p);
 121         for (i = 0; i < p->n_next; i++)
 122                 uci_to_blob(b, s, p->next[i]);
 123 }
 124
 125 static int
 126 config_parse_bridge_interface(struct uci_section *s)
 127 {
 128         char *name;
 129
 130         name = alloca(strlen(s->e.name) + 4);
 131         sprintf(name, "br-%s", s->e.name);
 132         blobmsg_add_string(&b, "name", name);
 133
 134         uci_to_blob(&b, s, bridge_device_type.config_params);
 135         if (!device_create(name, &bridge_device_type, b.head)) {
 136                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
 137                 return -EINVAL;
 138         }
 139
 140         blob_buf_init(&b, 0);
 141         blobmsg_add_string(&b, "ifname", name);
 142         return 0;
 143 }
 144
 145 static void
 146 config_parse_interface(struct uci_section *s)
 147 {
 148         struct interface *iface;
 149         const char *type;
 150         struct blob_attr *config;
 151         struct device *dev;
 152
 153         blob_buf_init(&b, 0);
 154
 155         type = uci_lookup_option_string(uci_ctx, s, "type");
 156         if (type && !strcmp(type, "bridge"))
 157                 if (config_parse_bridge_interface(s))
 158                         return;
 159
 160         uci_to_blob(&b, s, &interface_attr_list);
 161         iface = calloc(1, sizeof(*iface));
 162         if (!iface)
 163                 return;
 164
 165         interface_init(iface, s->e.name, b.head);
 166
 167         if (iface->proto_handler && iface->proto_handler->config_params)
 168                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 169
 170         config = malloc(blob_pad_len(b.head));
 171         if (!config) {
 172                 free(iface);
 173                 return;
 174         }
 175
 176         memcpy(config, b.head, blob_pad_len(b.head));
 177         interface_add(iface, config);
 178
 179         dev = iface->main_dev.dev;
 180         if (!dev || !dev->default_config)
 181                 return;
 182
 183         blob_buf_init(&b, 0);
 184         uci_to_blob(&b, s, dev->type->config_params);
 185         if (blob_len(b.head) == 0)
 186                 return;
 187
 188         device_set_config(dev, dev->type, b.head);
 189 }
 190
 191 static void
 192 config_parse_route(struct uci_section *s, bool v6)
 193 {
 194         void *route;
 195
 196         blob_buf_init(&b, 0);
 197         route = blobmsg_open_array(&b, "route");
 198         uci_to_blob(&b, s, &route_attr_list);
 199         blobmsg_close_array(&b, route);
 200         interface_ip_add_route(NULL, blob_data(b.head), v6);
 201 }
 202
 203 static void
 204 config_init_devices(void)
 205 {
 206         struct uci_element *e;
 207
 208         uci_foreach_element(&uci_network->sections, e) {
 209                 struct uci_section *s = uci_to_section(e);
 210                 const struct device_type *devtype;
 211                 const char *type, *name;
 212
 213                 if (strcmp(s->type, "device") != 0)
 214                         continue;
 215
 216                 name = uci_lookup_option_string(uci_ctx, s, "name");
 217                 if (!name)
 218                         continue;
 219
 220                 type = uci_lookup_option_string(uci_ctx, s, "type");
 221                 if (type && !strcmp(type, "bridge"))
 222                         devtype = &bridge_device_type;
 223                 else
 224                         devtype = &simple_device_type;
 225
 226                 blob_buf_init(&b, 0);
 227                 uci_to_blob(&b, s, devtype->config_params);
 228                 device_create(name, devtype, b.head);
 229         }
 230 }
 231
 232 bool
 233 config_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 234             const struct config_param_list *config, unsigned long *diff)
 235 {
 236         bool ret = false;
 237         int i;
 238
 239         for (i = 0; i < config->n_params; i++) {
 240                 if (!tb1[i] && !tb2[i])
 241                         continue;
 242
 243                 if (!!tb1[i] != !!tb2[i])
 244                         goto mark;
 245
 246                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 247                         goto mark;
 248
 249                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 250                         goto mark;
 251
 252                 continue;
 253
 254 mark:
 255                 ret = true;
 256                 if (diff)
 257                         set_bit(diff, i);
 258                 else
 259                         return ret;
 260         }
 261
 262         return ret;
 263 }
 264
 265
 266 static bool
 267 __config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 268                      const struct config_param_list *config)
 269 {
 270         struct blob_attr **tb1, **tb2;
 271
 272         if (!!c1 ^ !!c2)
 273                 return false;
 274
 275         if (!c1 && !c2)
 276                 return true;
 277
 278         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 279         blobmsg_parse(config->params, config->n_params, tb1,
 280                 blob_data(c1), blob_len(c1));
 281
 282         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 283         blobmsg_parse(config->params, config->n_params, tb2,
 284                 blob_data(c2), blob_len(c2));
 285
 286         return !config_diff(tb1, tb2, config, NULL);
 287 }
 288
 289 bool
 290 config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 291                    const struct config_param_list *config)
 292 {
 293         int i;
 294
 295         if (!__config_check_equal(c1, c2, config))
 296                 return false;
 297
 298         for (i = 0; i < config->n_next; i++) {
 299                 if (!__config_check_equal(c1, c2, config->next[i]))
 300                         return false;
 301         }
 302
 303         return true;
 304 }
 305
 306 struct blob_attr *
 307 config_memdup(struct blob_attr *attr)
 308 {
 309         struct blob_attr *ret;
 310         int size = blob_pad_len(attr);
 311
 312         ret = malloc(size);
 313         if (!ret)
 314                 return NULL;
 315
 316         memcpy(ret, attr, size);
 317         return ret;
 318 }
 319
 320 static struct uci_package *
 321 config_init_package(const char *config)
 322 {
 323         struct uci_context *ctx = uci_ctx;
 324         struct uci_package *p = NULL;
 325
 326         if (!ctx) {
 327                 ctx = uci_alloc_context();
 328                 uci_ctx = ctx;
 329
 330 #ifdef DUMMY_MODE
 331                 uci_set_confdir(ctx, "./config");
 332                 uci_set_savedir(ctx, "./tmp");
 333 #endif
 334         } else {
 335                 p = uci_lookup_package(ctx, config);
 336                 if (p)
 337                         uci_unload(ctx, p);
 338         }
 339
 340         if (uci_load(ctx, "network", &p))
 341                 return NULL;
 342
 343         return p;
 344 }
 345
 346 static void
 347 config_init_interfaces(void)
 348 {
 349         struct uci_element *e;
 350
 351         uci_foreach_element(&uci_network->sections, e) {
 352                 struct uci_section *s = uci_to_section(e);
 353
 354                 if (!strcmp(s->type, "interface"))
 355                         config_parse_interface(s);
 356         }
 357 }
 358
 359 static void
 360 config_init_routes(void)
 361 {
 362         struct interface *iface;
 363         struct uci_element *e;
 364
 365         vlist_for_each_element(&interfaces, iface, node)
 366                 interface_ip_update_start(&iface->config_ip);
 367
 368         uci_foreach_element(&uci_network->sections, e) {
 369                 struct uci_section *s = uci_to_section(e);
 370
 371                 if (!strcmp(s->type, "route"))
 372                         config_parse_route(s, false);
 373                 else if (!strcmp(s->type, "route6"))
 374                         config_parse_route(s, true);
 375         }
 376
 377         vlist_for_each_element(&interfaces, iface, node)
 378                 interface_ip_update_complete(&iface->config_ip);
 379 }
 380
 381 void
 382 config_init_all(void)
 383 {
 384         uci_network = config_init_package("network");
 385         if (!uci_network) {
 386                 fprintf(stderr, "Failed to load network config\n");
 387                 return;
 388         }
 389
 390         config_init = true;
 391         device_lock();
 392
 393         device_reset_config();
 394         config_init_devices();
 395         config_init_interfaces();
 396         config_init_routes();
 397
 398         config_init = false;
 399         device_unlock();
 400
 401         device_reset_old();
 402         device_init_pending();
 403         device_free_unused(NULL);
 404         interface_start_pending();
 405 }