ubusd_proto.c

   1 #include <arpa/inet.h>
   2 #include "ubusd.h"
   3
   4 static struct blob_buf b;
   5 static struct ubus_msg_buf *retmsg;
   6 static int *retmsg_data;
   7
   8 static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
   9
  10 typedef int (*ubus_cmd_cb)(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr);
  11
  12 static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
  13         [UBUS_ATTR_SIGNATURE] = { .type = BLOB_ATTR_NESTED },
  14         [UBUS_ATTR_OBJTYPE] = { .type = BLOB_ATTR_INT32 },
  15         [UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
  16         [UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
  17         [UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
  18 };
  19
  20 struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
  21 {
  22         blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
  23         return attrbuf;
  24 }
  25
  26 static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
  27 {
  28         ub->hdr.version = 0;
  29         ub->hdr.type = type;
  30         ub->hdr.seq = seq;
  31         ub->hdr.peer = peer;
  32 }
  33
  34 static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
  35 {
  36         return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
  37 }
  38
  39 static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
  40 {
  41         struct ubus_msg_buf *new;
  42
  43         new = ubus_msg_new(b.head, blob_raw_len(b.head), shared);
  44         if (!new)
  45                 return NULL;
  46
  47         ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
  48         return new;
  49 }
  50
  51 bool ubusd_send_hello(struct ubus_client *cl)
  52 {
  53         struct ubus_msg_buf *ub;
  54
  55         blob_buf_init(&b, 0);
  56         ub = ubus_msg_from_blob(true);
  57         if (!ub)
  58                 return false;
  59
  60         ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
  61         ubus_msg_send(cl, ub);
  62         return true;
  63 }
  64
  65 static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
  66 {
  67         ub->hdr.type = UBUS_MSG_DATA;
  68         ubus_msg_send(cl, ubus_msg_ref(ub));
  69         return 0;
  70 }
  71
  72 static int ubusd_handle_publish(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
  73 {
  74         struct ubus_object *obj;
  75
  76         obj = ubusd_create_object(cl, attr);
  77         if (!obj)
  78                 return UBUS_STATUS_INVALID_ARGUMENT;
  79
  80         blob_buf_init(&b, 0);
  81         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
  82         if (attr[UBUS_ATTR_SIGNATURE])
  83                 blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
  84
  85         ub = ubus_reply_from_blob(ub, true);
  86         if (!ub)
  87                 return UBUS_STATUS_NO_DATA;
  88
  89         ubus_msg_send(cl, ub);
  90         return 0;
  91 }
  92
  93 static void ubusd_send_obj(struct ubus_client *cl, struct ubus_msg_buf *ub, struct ubus_object *obj)
  94 {
  95         struct ubus_method *m;
  96         void *s;
  97
  98         blob_buf_init(&b, 0);
  99
 100         if (obj->path.key)
 101                 blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->path.key);
 102         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
 103
 104         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 105         list_for_each_entry(m, &obj->type->methods, list)
 106                 blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
 107         blob_nest_end(&b, s);
 108
 109         ub = ubus_reply_from_blob(ub, true);
 110         if (!ub)
 111                 return;
 112
 113         ubus_msg_send(cl, ub);
 114 }
 115
 116 static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 117 {
 118         struct ubus_object *obj;
 119         char *objpath;
 120         bool wildcard = false;
 121         bool found = false;
 122         int len;
 123
 124         if (!attr[UBUS_ATTR_OBJPATH]) {
 125                 avl_for_each_element(&path, obj, path)
 126                         ubusd_send_obj(cl, ub, obj);
 127                 return 0;
 128         }
 129
 130         objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
 131         len = strlen(objpath);
 132         if (objpath[len - 1] != '*') {
 133                 obj = avl_find_element(&path, objpath, obj, path);
 134                 if (!obj)
 135                         return UBUS_STATUS_NOT_FOUND;
 136
 137                 ubusd_send_obj(cl, ub, obj);
 138                 return 0;
 139         }
 140
 141         objpath[--len] = 0;
 142         wildcard = true;
 143
 144         obj = avl_find_ge_element(&path, objpath, obj, path);
 145         if (!obj)
 146                 return UBUS_STATUS_NOT_FOUND;
 147
 148         while (!strncmp(objpath, obj->path.key, len)) {
 149                 found = true;
 150                 ubusd_send_obj(cl, ub, obj);
 151                 if (obj == avl_last_element(&path, obj, path))
 152                         break;
 153                 obj = avl_next_element(obj, path);
 154         }
 155
 156         if (!found)
 157                 return UBUS_STATUS_NOT_FOUND;
 158
 159         return 0;
 160 }
 161
 162 static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 163 {
 164         struct ubus_object *obj = NULL;
 165         struct ubus_id *id;
 166         const char *method;
 167
 168         if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
 169                 return UBUS_STATUS_INVALID_ARGUMENT;
 170
 171         id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
 172         if (!id)
 173                 return UBUS_STATUS_NOT_FOUND;
 174
 175         obj = container_of(id, struct ubus_object, id);
 176
 177         method = blob_data(attr[UBUS_ATTR_METHOD]);
 178         blob_buf_init(&b, 0);
 179         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
 180         blob_put_string(&b, UBUS_ATTR_METHOD, method);
 181         if (attr[UBUS_ATTR_DATA])
 182                 blob_put(&b, UBUS_ATTR_DATA, blob_data(attr[UBUS_ATTR_DATA]),
 183                          blob_len(attr[UBUS_ATTR_DATA]));
 184
 185         ubus_msg_free(ub);
 186
 187         ub = ubus_reply_from_blob(ub, true);
 188         if (!ub)
 189                 return UBUS_STATUS_NO_DATA;
 190
 191         ub->hdr.type = UBUS_MSG_INVOKE;
 192         ub->hdr.peer = cl->id.id;
 193         ubus_msg_send(obj->client, ub);
 194
 195         return -1;
 196 }
 197
 198 static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 199 {
 200         struct ubus_object *obj;
 201         struct ubus_id *id;
 202
 203         if (!attr[UBUS_ATTR_OBJID] ||
 204             (ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
 205             (ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
 206                 goto error;
 207
 208         id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
 209         if (!id)
 210                 goto error;
 211
 212         obj = container_of(id, struct ubus_object, id);
 213         if (cl != obj->client)
 214                 goto error;
 215
 216         cl = ubusd_get_client_by_id(ub->hdr.peer);
 217         if (!cl)
 218                 goto error;
 219
 220         ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]);
 221         ubus_msg_send(cl, ub);
 222         return -1;
 223
 224 error:
 225         ubus_msg_free(ub);
 226         return -1;
 227 }
 228
 229 static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
 230         [UBUS_MSG_PING] = ubusd_send_pong,
 231         [UBUS_MSG_PUBLISH] = ubusd_handle_publish,
 232         [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
 233         [UBUS_MSG_INVOKE] = ubusd_handle_invoke,
 234         [UBUS_MSG_STATUS] = ubusd_handle_response,
 235         [UBUS_MSG_DATA] = ubusd_handle_response,
 236 };
 237
 238 void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
 239 {
 240         ubus_cmd_cb cb = NULL;
 241         int ret;
 242
 243         retmsg->hdr.seq = ub->hdr.seq;
 244         retmsg->hdr.peer = ub->hdr.peer;
 245
 246         if (ub->hdr.type < __UBUS_MSG_LAST)
 247                 cb = handlers[ub->hdr.type];
 248
 249         if (cb)
 250                 ret = cb(cl, ub, ubus_parse_msg(ub->data));
 251         else
 252                 ret = UBUS_STATUS_INVALID_COMMAND;
 253
 254         if (ret == -1)
 255                 return;
 256
 257         ubus_msg_free(ub);
 258
 259         *retmsg_data = htonl(ret);
 260         ubus_msg_send(cl, ubus_msg_ref(retmsg));
 261 }
 262
 263 static void __init ubusd_proto_init(void)
 264 {
 265         blob_buf_init(&b, 0);
 266         blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
 267
 268         retmsg = ubus_msg_from_blob(false);
 269         if (!retmsg)
 270                 exit(1);
 271
 272         retmsg->hdr.type = UBUS_MSG_STATUS;
 273         retmsg_data = blob_data(blob_data(retmsg->data));
 274 }