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
 151         blob_buf_init(&b, 0);
 152
 153         type = uci_lookup_option_string(uci_ctx, s, "type");
 154         if (type && !strcmp(type, "bridge"))
 155                 if (config_parse_bridge_interface(s))
 156                         return;
 157
 158         uci_to_blob(&b, s, &interface_attr_list);
 159         iface = calloc(1, sizeof(*iface));
 160         if (!iface)
 161                 return;
 162
 163         interface_init(iface, s->e.name, b.head);
 164
 165         if (iface->proto_handler && iface->proto_handler->config_params)
 166                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 167
 168         config = malloc(blob_pad_len(b.head));
 169         if (!config) {
 170                 free(iface);
 171                 return;
 172         }
 173
 174         memcpy(config, b.head, blob_pad_len(b.head));
 175         interface_add(iface, config);
 176 }
 177
 178 static void
 179 config_init_devices(void)
 180 {
 181         struct uci_element *e;
 182
 183         uci_foreach_element(&uci_network->sections, e) {
 184                 struct uci_section *s = uci_to_section(e);
 185                 const struct device_type *devtype;
 186                 const char *type, *name;
 187
 188                 if (strcmp(s->type, "device") != 0)
 189                         continue;
 190
 191                 name = uci_lookup_option_string(uci_ctx, s, "name");
 192                 if (!name)
 193                         continue;
 194
 195                 type = uci_lookup_option_string(uci_ctx, s, "type");
 196                 if (type && !strcmp(type, "bridge"))
 197                         devtype = &bridge_device_type;
 198                 else
 199                         devtype = &simple_device_type;
 200
 201                 blob_buf_init(&b, 0);
 202                 uci_to_blob(&b, s, devtype->config_params);
 203                 device_create(name, devtype, b.head);
 204         }
 205 }
 206
 207 bool
 208 config_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 209             const struct config_param_list *config, unsigned long *diff)
 210 {
 211         bool ret = false;
 212         int i;
 213
 214         for (i = 0; i < config->n_params; i++) {
 215                 if (!tb1[i] && !tb2[i])
 216                         continue;
 217
 218                 if (!!tb1[i] != !!tb2[i])
 219                         goto mark;
 220
 221                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 222                         goto mark;
 223
 224                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 225                         goto mark;
 226
 227                 continue;
 228
 229 mark:
 230                 ret = true;
 231                 if (diff)
 232                         set_bit(diff, i);
 233                 else
 234                         return ret;
 235         }
 236
 237         return ret;
 238 }
 239
 240
 241 static bool
 242 __config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 243                      const struct config_param_list *config)
 244 {
 245         struct blob_attr **tb1, **tb2;
 246
 247         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 248         blobmsg_parse(config->params, config->n_params, tb1,
 249                 blob_data(c1), blob_len(c1));
 250
 251         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 252         blobmsg_parse(config->params, config->n_params, tb2,
 253                 blob_data(c2), blob_len(c2));
 254
 255         return !config_diff(tb1, tb2, config, NULL);
 256 }
 257
 258 bool
 259 config_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 260                    const struct config_param_list *config)
 261 {
 262         int i;
 263
 264         if (!__config_check_equal(c1, c2, config))
 265                 return false;
 266
 267         for (i = 0; i < config->n_next; i++) {
 268                 if (!__config_check_equal(c1, c2, config->next[i]))
 269                         return false;
 270         }
 271
 272         return true;
 273 }
 274
 275 struct blob_attr *
 276 config_memdup(struct blob_attr *attr)
 277 {
 278         struct blob_attr *ret;
 279         int size = blob_pad_len(attr);
 280
 281         ret = malloc(size);
 282         if (!ret)
 283                 return NULL;
 284
 285         memcpy(ret, attr, size);
 286         return ret;
 287 }
 288
 289 static struct uci_package *
 290 config_init_package(const char *config)
 291 {
 292         struct uci_context *ctx = uci_ctx;
 293         struct uci_package *p = NULL;
 294
 295         if (!ctx) {
 296                 ctx = uci_alloc_context();
 297                 uci_ctx = ctx;
 298
 299 #ifdef DUMMY_MODE
 300                 uci_set_confdir(ctx, "./config");
 301                 uci_set_savedir(ctx, "./tmp");
 302 #endif
 303         } else {
 304                 p = uci_lookup_package(ctx, config);
 305                 if (p)
 306                         uci_unload(ctx, p);
 307         }
 308
 309         if (uci_load(ctx, "network", &p))
 310                 return NULL;
 311
 312         return p;
 313 }
 314
 315 void
 316 config_init_interfaces(const char *name)
 317 {
 318         struct uci_context *ctx;
 319         struct uci_package *p = NULL;
 320         struct uci_element *e;
 321
 322         p = config_init_package("network");
 323         ctx = uci_ctx;
 324         if (!p) {
 325                 fprintf(stderr, "Failed to load network config\n");
 326                 return;
 327         }
 328
 329         uci_network = p;
 330         config_init = true;
 331
 332         config_init_devices();
 333
 334         uci_foreach_element(&p->sections, e) {
 335                 struct uci_section *s = uci_to_section(e);
 336
 337                 if (name && strcmp(s->e.name, name) != 0)
 338                         continue;
 339
 340                 if (!strcmp(s->type, "interface"))
 341                         config_parse_interface(s);
 342         }
 343         device_free_unused(NULL);
 344         config_init = false;
 345
 346         device_init_pending();
 347         interface_start_pending();
 348 }