blob.c

   1 /*
   2  * blob.c - uci <-> blobmsg conversion layer
   3  * Copyright (C) 2012-2013 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Lesser General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include <libubox/blobmsg.h>
  19 #include "uci.h"
  20 #include "uci_blob.h"
  21
  22 static bool
  23 uci_attr_to_blob(struct blob_buf *b, const char *str,
  24                  const char *name, enum blobmsg_type type)
  25 {
  26         char *err;
  27         int intval;
  28
  29         switch (type) {
  30         case BLOBMSG_TYPE_STRING:
  31                 blobmsg_add_string(b, name, str);
  32                 break;
  33         case BLOBMSG_TYPE_BOOL:
  34                 if (!strcmp(str, "true") || !strcmp(str, "1"))
  35                         intval = 1;
  36                 else if (!strcmp(str, "false") || !strcmp(str, "0"))
  37                         intval = 0;
  38                 else
  39                         return false;
  40
  41                 blobmsg_add_u8(b, name, intval);
  42                 break;
  43         case BLOBMSG_TYPE_INT32:
  44                 intval = strtol(str, &err, 0);
  45                 if (*err)
  46                         return false;
  47
  48                 blobmsg_add_u32(b, name, intval);
  49                 break;
  50         default:
  51                 return false;
  52         }
  53         return true;
  54 }
  55
  56 static void
  57 uci_array_to_blob(struct blob_buf *b, struct uci_option *o,
  58                   enum blobmsg_type type)
  59 {
  60         struct uci_element *e;
  61         char *str, *next, *word;
  62
  63         if (o->type == UCI_TYPE_LIST) {
  64                 uci_foreach_element(&o->v.list, e) {
  65                         uci_attr_to_blob(b, e->name, NULL, type);
  66                 }
  67                 return;
  68         }
  69
  70         str = strdup(o->v.string);
  71         next = str;
  72
  73         while ((word = strsep(&next, " \t")) != NULL) {
  74                 if (!*word)
  75                         continue;
  76
  77                 uci_attr_to_blob(b, word, NULL, type);
  78         }
  79
  80         free(str);
  81 }
  82
  83 static int
  84 __uci_element_to_blob(struct blob_buf *b, struct uci_element *e,
  85                       const struct uci_blob_param_list *p)
  86 {
  87         const struct blobmsg_policy *attr = NULL;
  88         struct uci_option *o = uci_to_option(e);
  89         unsigned int types = 0;
  90         void *array;
  91         int i, ret = 0;
  92
  93         for (i = 0; i < p->n_params; i++) {
  94                 attr = &p->params[i];
  95
  96                 if (strcmp(attr->name, e->name) != 0)
  97                         continue;
  98
  99                 if (attr->type > BLOBMSG_TYPE_LAST)
 100                         continue;
 101
 102                 if (types & (1 << attr->type))
 103                         continue;
 104
 105                 types |= 1 << attr->type;
 106
 107                 if (attr->type == BLOBMSG_TYPE_ARRAY) {
 108                         if (!p->info)
 109                                 continue;
 110
 111                         array = blobmsg_open_array(b, attr->name);
 112                         uci_array_to_blob(b, o, p->info[i].type);
 113                         blobmsg_close_array(b, array);
 114                         ret++;
 115                         continue;
 116                 }
 117
 118                 if (o->type == UCI_TYPE_LIST)
 119                         continue;
 120
 121                 ret += uci_attr_to_blob(b, o->v.string, attr->name, attr->type);
 122         }
 123         return ret;
 124 }
 125
 126 static int
 127 __uci_to_blob(struct blob_buf *b, struct uci_section *s,
 128               const struct uci_blob_param_list *p)
 129 {
 130         struct uci_element *e;
 131         int ret = 0;
 132
 133         uci_foreach_element(&s->options, e)
 134                 ret += __uci_element_to_blob(b, e, p);
 135
 136         return ret;
 137 }
 138
 139 int
 140 uci_to_blob(struct blob_buf *b, struct uci_section *s,
 141             const struct uci_blob_param_list *p)
 142 {
 143         int ret = 0;
 144         int i;
 145
 146         ret += __uci_to_blob(b, s, p);
 147         for (i = 0; i < p->n_next; i++)
 148                 ret += uci_to_blob(b, s, p->next[i]);
 149
 150         return ret;
 151 }
 152
 153 bool
 154 uci_blob_diff(struct blob_attr **tb1, struct blob_attr **tb2,
 155               const struct uci_blob_param_list *config, unsigned long *diff)
 156 {
 157         bool ret = false;
 158         int i;
 159
 160         for (i = 0; i < config->n_params; i++) {
 161                 if (!tb1[i] && !tb2[i])
 162                         continue;
 163
 164                 if (!!tb1[i] != !!tb2[i])
 165                         goto mark;
 166
 167                 if (blob_len(tb1[i]) != blob_len(tb2[i]))
 168                         goto mark;
 169
 170                 if (memcmp(tb1[i], tb2[i], blob_raw_len(tb1[i])) != 0)
 171                         goto mark;
 172
 173                 continue;
 174
 175 mark:
 176                 ret = true;
 177                 if (diff)
 178                         bitfield_set(diff, i);
 179                 else
 180                         return ret;
 181         }
 182
 183         return ret;
 184 }
 185
 186
 187 static bool
 188 __uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 189                        const struct uci_blob_param_list *config)
 190 {
 191         struct blob_attr **tb1, **tb2;
 192
 193         if (!!c1 ^ !!c2)
 194                 return false;
 195
 196         if (!c1 && !c2)
 197                 return true;
 198
 199         tb1 = alloca(config->n_params * sizeof(struct blob_attr *));
 200         blobmsg_parse(config->params, config->n_params, tb1,
 201                 blob_data(c1), blob_len(c1));
 202
 203         tb2 = alloca(config->n_params * sizeof(struct blob_attr *));
 204         blobmsg_parse(config->params, config->n_params, tb2,
 205                 blob_data(c2), blob_len(c2));
 206
 207         return !uci_blob_diff(tb1, tb2, config, NULL);
 208 }
 209
 210 bool
 211 uci_blob_check_equal(struct blob_attr *c1, struct blob_attr *c2,
 212                      const struct uci_blob_param_list *config)
 213 {
 214         int i;
 215
 216         if (!__uci_blob_check_equal(c1, c2, config))
 217                 return false;
 218
 219         for (i = 0; i < config->n_next; i++) {
 220                 if (!__uci_blob_check_equal(c1, c2, config->next[i]))
 221                         return false;
 222         }
 223
 224         return true;
 225 }