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, true);
  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, ub, false);
  69         return 0;
  70 }
  71
  72 static int ubusd_handle_add_object(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, true);
  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         blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id.id);
 104
 105         s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
 106         list_for_each_entry(m, &obj->type->methods, list)
 107                 blob_put(&b, blob_id(m->data), blob_data(m->data), blob_len(m->data));
 108         blob_nest_end(&b, s);
 109
 110         ub = ubus_reply_from_blob(ub, true);
 111         if (!ub)
 112                 return;
 113
 114         ubus_msg_send(cl, ub, true);
 115 }
 116
 117 static int ubusd_handle_lookup(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 118 {
 119         struct ubus_object *obj;
 120         char *objpath;
 121         bool wildcard = false;
 122         bool found = false;
 123         int len;
 124
 125         if (!attr[UBUS_ATTR_OBJPATH]) {
 126                 avl_for_each_element(&path, obj, path)
 127                         ubusd_send_obj(cl, ub, obj);
 128                 return 0;
 129         }
 130
 131         objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
 132         len = strlen(objpath);
 133         if (objpath[len - 1] != '*') {
 134                 obj = avl_find_element(&path, objpath, obj, path);
 135                 if (!obj)
 136                         return UBUS_STATUS_NOT_FOUND;
 137
 138                 ubusd_send_obj(cl, ub, obj);
 139                 return 0;
 140         }
 141
 142         objpath[--len] = 0;
 143         wildcard = true;
 144
 145         obj = avl_find_ge_element(&path, objpath, obj, path);
 146         if (!obj)
 147                 return UBUS_STATUS_NOT_FOUND;
 148
 149         while (!strncmp(objpath, obj->path.key, len)) {
 150                 found = true;
 151                 ubusd_send_obj(cl, ub, obj);
 152                 if (obj == avl_last_element(&path, obj, path))
 153                         break;
 154                 obj = avl_next_element(obj, path);
 155         }
 156
 157         if (!found)
 158                 return UBUS_STATUS_NOT_FOUND;
 159
 160         return 0;
 161 }
 162
 163 static int ubusd_handle_invoke(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 164 {
 165         struct ubus_object *obj = NULL;
 166         struct ubus_id *id;
 167         const char *method;
 168
 169         if (!attr[UBUS_ATTR_METHOD] || !attr[UBUS_ATTR_OBJID])
 170                 return UBUS_STATUS_INVALID_ARGUMENT;
 171
 172         id = ubus_find_id(&objects, blob_get_int32(attr[UBUS_ATTR_OBJID]));
 173         if (!id)
 174                 return UBUS_STATUS_NOT_FOUND;
 175
 176         obj = container_of(id, struct ubus_object, id);
 177
 178         method = blob_data(attr[UBUS_ATTR_METHOD]);
 179
 180         if (!obj->client)
 181                 return obj->recv_msg(cl, method, attr[UBUS_ATTR_DATA]);
 182
 183         blob_buf_init(&b, 0);
 184         blob_put_int32(&b, UBUS_ATTR_OBJID, obj->id.id);
 185         blob_put_string(&b, UBUS_ATTR_METHOD, method);
 186         if (attr[UBUS_ATTR_DATA])
 187                 blob_put(&b, UBUS_ATTR_DATA, blob_data(attr[UBUS_ATTR_DATA]),
 188                          blob_len(attr[UBUS_ATTR_DATA]));
 189
 190         ubus_msg_free(ub);
 191
 192         ub = ubus_reply_from_blob(ub, true);
 193         if (!ub)
 194                 return UBUS_STATUS_NO_DATA;
 195
 196         ub->hdr.type = UBUS_MSG_INVOKE;
 197         ub->hdr.peer = cl->id.id;
 198         ubus_msg_send(obj->client, ub, true);
 199
 200         return -1;
 201 }
 202
 203 static int ubusd_handle_response(struct ubus_client *cl, struct ubus_msg_buf *ub, struct blob_attr **attr)
 204 {
 205         struct ubus_object *obj;
 206
 207         if (!attr[UBUS_ATTR_OBJID] ||
 208             (ub->hdr.type == UBUS_MSG_STATUS && !attr[UBUS_ATTR_STATUS]) ||
 209             (ub->hdr.type == UBUS_MSG_DATA && !attr[UBUS_ATTR_DATA]))
 210                 goto error;
 211
 212         obj = ubusd_find_object(blob_get_int32(attr[UBUS_ATTR_OBJID]));
 213         if (!obj)
 214                 goto error;
 215
 216         if (cl != obj->client)
 217                 goto error;
 218
 219         cl = ubusd_get_client_by_id(ub->hdr.peer);
 220         if (!cl)
 221                 goto error;
 222
 223         ub->hdr.peer = blob_get_int32(attr[UBUS_ATTR_OBJID]);
 224         ubus_msg_send(cl, ub, true);
 225         return -1;
 226
 227 error:
 228         ubus_msg_free(ub);
 229         return -1;
 230 }
 231
 232 static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
 233         [UBUS_MSG_PING] = ubusd_send_pong,
 234         [UBUS_MSG_ADD_OBJECT] = ubusd_handle_add_object,
 235         [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
 236         [UBUS_MSG_INVOKE] = ubusd_handle_invoke,
 237         [UBUS_MSG_STATUS] = ubusd_handle_response,
 238         [UBUS_MSG_DATA] = ubusd_handle_response,
 239 };
 240
 241 void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
 242 {
 243         ubus_cmd_cb cb = NULL;
 244         int ret;
 245
 246         retmsg->hdr.seq = ub->hdr.seq;
 247         retmsg->hdr.peer = ub->hdr.peer;
 248
 249         if (ub->hdr.type < __UBUS_MSG_LAST)
 250                 cb = handlers[ub->hdr.type];
 251
 252         if (cb)
 253                 ret = cb(cl, ub, ubus_parse_msg(ub->data));
 254         else
 255                 ret = UBUS_STATUS_INVALID_COMMAND;
 256
 257         if (ret == -1)
 258                 return;
 259
 260         ubus_msg_free(ub);
 261
 262         *retmsg_data = htonl(ret);
 263         ubus_msg_send(cl, retmsg, false);
 264 }
 265
 266 static void __init ubusd_proto_init(void)
 267 {
 268         blob_buf_init(&b, 0);
 269         blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
 270
 271         retmsg = ubus_msg_from_blob(false);
 272         if (!retmsg)
 273                 exit(1);
 274
 275         retmsg->hdr.type = UBUS_MSG_STATUS;
 276         retmsg_data = blob_data(blob_data(retmsg->data));
 277 }