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);
  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 };
  17
  18 struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
  19 {
  20         blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
  21         return attrbuf;
  22 }
  23
  24 static void ubus_msg_init(struct ubus_msg_buf *ub, uint8_t type, uint16_t seq, uint32_t peer)
  25 {
  26         ub->hdr.version = 0;
  27         ub->hdr.type = type;
  28         ub->hdr.seq = seq;
  29         ub->hdr.peer = peer;
  30 }
  31
  32 static struct ubus_msg_buf *ubus_msg_from_blob(bool shared)
  33 {
  34         return ubus_msg_new(b.head, blob_raw_len(b.head), shared);
  35 }
  36
  37 static struct ubus_msg_buf *ubus_reply_from_blob(struct ubus_msg_buf *ub, bool shared)
  38 {
  39         struct ubus_msg_buf *new;
  40
  41         new = ubus_msg_new(b.head, blob_raw_len(b.head), shared);
  42         if (!new)
  43                 return NULL;
  44
  45         ubus_msg_init(new, UBUS_MSG_DATA, ub->hdr.seq, ub->hdr.peer);
  46         return new;
  47 }
  48
  49 bool ubusd_send_hello(struct ubus_client *cl)
  50 {
  51         struct ubus_msg_buf *ub;
  52
  53         blob_buf_init(&b, 0);
  54         ub = ubus_msg_from_blob(true);
  55         if (!ub)
  56                 return false;
  57
  58         ubus_msg_init(ub, UBUS_MSG_HELLO, 0, cl->id.id);
  59         ubus_msg_send(cl, ub);
  60         return true;
  61 }
  62
  63 static int ubusd_send_pong(struct ubus_client *cl, struct ubus_msg_buf *ub)
  64 {
  65         ub->hdr.type = UBUS_MSG_DATA;
  66         ubus_msg_send(cl, ubus_msg_ref(ub));
  67         return 0;
  68 }
  69
  70 static int ubusd_handle_publish(struct ubus_client *cl, struct ubus_msg_buf *ub)
  71 {
  72         struct ubus_object *obj;
  73         struct blob_attr **attr;
  74
  75         attr = ubus_parse_msg(ub->data);
  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)
 117 {
 118         struct ubus_object *obj;
 119         struct blob_attr **attr;
 120         char *objpath;
 121         bool wildcard = false;
 122         bool found = false;
 123         int len;
 124
 125         attr = ubus_parse_msg(ub->data);
 126         if (!attr[UBUS_ATTR_OBJPATH]) {
 127                 avl_for_each_element(&path, obj, path)
 128                         ubusd_send_obj(cl, ub, obj);
 129                 return 0;
 130         }
 131
 132         objpath = blob_data(attr[UBUS_ATTR_OBJPATH]);
 133         len = strlen(objpath);
 134         if (objpath[len - 1] != '*') {
 135                 obj = avl_find_element(&path, objpath, obj, path);
 136                 if (!obj)
 137                         return UBUS_STATUS_NOT_FOUND;
 138
 139                 ubusd_send_obj(cl, ub, obj);
 140                 return 0;
 141         }
 142
 143         objpath[--len] = 0;
 144         wildcard = true;
 145
 146         obj = avl_find_ge_element(&path, objpath, obj, path);
 147         if (!obj)
 148                 return UBUS_STATUS_NOT_FOUND;
 149
 150         while (!strncmp(objpath, obj->path.key, len)) {
 151                 found = true;
 152                 ubusd_send_obj(cl, ub, obj);
 153                 if (obj == avl_last_element(&path, obj, path))
 154                         break;
 155                 obj = avl_next_element(obj, path);
 156         }
 157
 158         if (!found)
 159                 return UBUS_STATUS_NOT_FOUND;
 160
 161         return 0;
 162 }
 163
 164 static const ubus_cmd_cb handlers[__UBUS_MSG_LAST] = {
 165         [UBUS_MSG_PING] = ubusd_send_pong,
 166         [UBUS_MSG_PUBLISH] = ubusd_handle_publish,
 167         [UBUS_MSG_LOOKUP] = ubusd_handle_lookup,
 168 };
 169
 170 void ubusd_receive_message(struct ubus_client *cl, struct ubus_msg_buf *ub)
 171 {
 172         ubus_cmd_cb cb = NULL;
 173         int ret;
 174
 175         retmsg->hdr.seq = ub->hdr.seq;
 176         retmsg->hdr.peer = ub->hdr.peer;
 177
 178         if (ub->hdr.type < __UBUS_MSG_LAST)
 179                 cb = handlers[ub->hdr.type];
 180
 181         if (cb)
 182                 ret = cb(cl, ub);
 183         else
 184                 ret = UBUS_STATUS_INVALID_COMMAND;
 185
 186         ubus_msg_free(ub);
 187
 188         *retmsg_data = htonl(ret);
 189         ubus_msg_send(cl, ubus_msg_ref(retmsg));
 190 }
 191
 192 static void __init ubusd_proto_init(void)
 193 {
 194         blob_buf_init(&b, 0);
 195         blob_put_int32(&b, UBUS_ATTR_STATUS, 0);
 196
 197         retmsg = ubus_msg_from_blob(false);
 198         if (!retmsg)
 199                 exit(1);
 200
 201         retmsg->hdr.type = UBUS_MSG_STATUS;
 202         retmsg_data = blob_data(blob_data(retmsg->data));
 203 }