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