709 lines
15 KiB
C
709 lines
15 KiB
C
#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <libubox/blob.h>
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#include <libubox/blobmsg.h>
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#include <libubox/usock.h>
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#include "libubus.h"
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#include "ubusmsg.h"
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#define DEBUG 1
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#ifdef DEBUG
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#define DPRINTF(_format, ...) fprintf(stderr, "ubus: " _format, ## __VA_ARGS__)
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#else
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#define DPRINTF(...) do {} while(0)
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#endif
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#define STATIC_IOV(_var) { .iov_base = (char *) &(_var), .iov_len = sizeof(_var) }
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const char *__ubus_strerror[__UBUS_STATUS_LAST] = {
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[UBUS_STATUS_OK] = "Success",
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[UBUS_STATUS_INVALID_COMMAND] = "Invalid command",
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[UBUS_STATUS_INVALID_ARGUMENT] = "Invalid argument",
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[UBUS_STATUS_METHOD_NOT_FOUND] = "Method not found",
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[UBUS_STATUS_NOT_FOUND] = "Not found",
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[UBUS_STATUS_NO_DATA] = "No response",
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};
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static struct blob_buf b;
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static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
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[UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
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[UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
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[UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
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[UBUS_ATTR_METHOD] = { .type = BLOB_ATTR_STRING },
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};
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static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
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struct ubus_pending_data {
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struct list_head list;
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int type;
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struct blob_attr data[];
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};
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static int ubus_cmp_id(const void *k1, const void *k2, void *ptr)
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{
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const uint32_t *id1 = k1, *id2 = k2;
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if (*id1 < *id2)
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return -1;
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else
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return *id1 > *id2;
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}
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static struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
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{
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blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
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return attrbuf;
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}
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const char *ubus_strerror(int error)
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{
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static char err[32];
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if (error < 0 || error >= __UBUS_STATUS_LAST)
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goto out;
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if (!__ubus_strerror[error])
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goto out;
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return __ubus_strerror[error];
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out:
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sprintf(err, "Unknown error: %d", error);
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return err;
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}
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static int ubus_send_msg(struct ubus_context *ctx, uint32_t seq,
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struct blob_attr *msg, int cmd, uint32_t peer)
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{
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struct ubus_msghdr hdr;
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struct iovec iov[2] = {
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STATIC_IOV(hdr)
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};
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hdr.version = 0;
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hdr.type = cmd;
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hdr.seq = seq;
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hdr.peer = peer;
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if (!msg) {
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blob_buf_init(&b, 0);
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msg = b.head;
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}
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iov[1].iov_base = (char *) msg;
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iov[1].iov_len = blob_raw_len(msg);
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return writev(ctx->sock.fd, iov, 2);
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}
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static int ubus_start_request(struct ubus_context *ctx, struct ubus_request *req,
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struct blob_attr *msg, int cmd, uint32_t peer)
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{
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memset(req, 0, sizeof(*req));
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INIT_LIST_HEAD(&req->list);
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INIT_LIST_HEAD(&req->pending);
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req->ctx = ctx;
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req->peer = peer;
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req->seq = ++ctx->request_seq;
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return ubus_send_msg(ctx, req->seq, msg, cmd, peer);
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}
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static bool recv_retry(int fd, struct iovec *iov, bool wait)
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{
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int bytes;
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while (iov->iov_len > 0) {
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bytes = read(fd, iov->iov_base, iov->iov_len);
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if (bytes < 0) {
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bytes = 0;
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if (errno == EINTR)
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continue;
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if (errno != EAGAIN) {
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perror("read");
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return false;
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}
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}
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if (!wait && !bytes)
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return false;
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wait = true;
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iov->iov_len -= bytes;
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iov->iov_base += bytes;
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}
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return true;
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}
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static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
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{
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if (hdr->version != 0)
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return false;
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if (blob_raw_len(hdr->data) < sizeof(*hdr->data))
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return false;
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if (blob_raw_len(hdr->data) + sizeof(*hdr) > UBUS_MAX_MSGLEN)
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return false;
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return true;
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}
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static bool get_next_msg(struct ubus_context *ctx, bool wait)
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{
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struct iovec iov = STATIC_IOV(ctx->msgbuf.hdr);
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/* receive header + start attribute */
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iov.iov_len += sizeof(struct blob_attr);
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if (!recv_retry(ctx->sock.fd, &iov, wait))
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return false;
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iov.iov_len = blob_len(ctx->msgbuf.hdr.data);
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if (iov.iov_len > 0 && !recv_retry(ctx->sock.fd, &iov, true))
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return false;
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return ubus_validate_hdr(&ctx->msgbuf.hdr);
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}
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static bool ubus_get_status(struct ubus_msghdr *hdr, int *ret)
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{
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ubus_parse_msg(hdr->data);
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if (!attrbuf[UBUS_ATTR_STATUS])
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return false;
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*ret = blob_get_int32(attrbuf[UBUS_ATTR_STATUS]);
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return true;
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}
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static void req_data_cb(struct ubus_request *req, int type, struct blob_attr *data)
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{
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struct blob_attr **attr;
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if (req->raw_data_cb)
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req->raw_data_cb(req, type, data);
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if (!req->data_cb)
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return;
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attr = ubus_parse_msg(data);
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req->data_cb(req, type, attr[UBUS_ATTR_DATA]);
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}
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static void ubus_process_req_data(struct ubus_request *req)
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{
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struct ubus_pending_data *data;
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while (!list_empty(&req->pending)) {
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data = list_first_entry(&req->pending,
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struct ubus_pending_data, list);
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list_del(&data->list);
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if (!req->cancelled)
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req_data_cb(req, data->type, data->data);
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free(data);
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}
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}
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static void ubus_req_complete_cb(struct ubus_request *req)
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{
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ubus_complete_handler_t cb = req->complete_cb;
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if (!cb)
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return;
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req->complete_cb = NULL;
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cb(req, req->status_code);
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}
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static int ubus_process_req_status(struct ubus_request *req, struct ubus_msghdr *hdr)
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{
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int ret = UBUS_STATUS_INVALID_ARGUMENT;
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if (!list_empty(&req->list))
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list_del(&req->list);
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ubus_get_status(hdr, &ret);
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req->peer = hdr->peer;
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req->status_msg = true;
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req->status_code = ret;
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if (!req->blocked)
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ubus_req_complete_cb(req);
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return ret;
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}
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static void ubus_req_data(struct ubus_request *req, struct ubus_msghdr *hdr)
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{
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struct ubus_pending_data *data;
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int len;
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if (!req->blocked) {
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req->blocked = true;
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req_data_cb(req, hdr->type, hdr->data);
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ubus_process_req_data(req);
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req->blocked = false;
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if (req->status_msg)
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ubus_req_complete_cb(req);
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return;
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}
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len = blob_raw_len(hdr->data);
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data = calloc(1, sizeof(*data) + len);
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if (!data)
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return;
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data->type = hdr->type;
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memcpy(data->data, hdr->data, len);
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list_add(&data->list, &req->pending);
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}
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static struct ubus_request *ubus_find_request(struct ubus_context *ctx, uint32_t seq, uint32_t peer)
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{
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struct ubus_request *req;
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list_for_each_entry(req, &ctx->requests, list) {
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if (seq != req->seq || peer != req->peer)
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continue;
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return req;
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}
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return NULL;
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}
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static void ubus_process_invoke(struct ubus_context *ctx, struct ubus_msghdr *hdr)
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{
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struct ubus_request_data req;
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struct ubus_object *obj;
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uint32_t objid = 0;
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int method;
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int ret = 0;
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ubus_parse_msg(hdr->data);
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if (!attrbuf[UBUS_ATTR_OBJID])
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return;
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objid = blob_get_int32(attrbuf[UBUS_ATTR_OBJID]);
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if (!attrbuf[UBUS_ATTR_METHOD]) {
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ret = UBUS_STATUS_INVALID_ARGUMENT;
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goto send;
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}
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obj = avl_find_element(&ctx->objects, &objid, obj, avl);
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if (!obj) {
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ret = UBUS_STATUS_NOT_FOUND;
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goto send;
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}
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for (method = 0; method < obj->n_methods; method++)
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if (!strcmp(obj->methods[method].name,
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blob_data(attrbuf[UBUS_ATTR_METHOD])))
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goto found;
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/* not found */
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ret = UBUS_STATUS_METHOD_NOT_FOUND;
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goto send;
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found:
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req.object = objid;
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req.peer = hdr->peer;
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req.seq = hdr->seq;
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ret = obj->methods[method].handler(ctx, obj, &req,
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obj->methods[method].name,
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attrbuf[UBUS_ATTR_DATA]);
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send:
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_STATUS, ret);
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blob_put_int32(&b, UBUS_ATTR_OBJID, objid);
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ubus_send_msg(ctx, hdr->seq, b.head, UBUS_MSG_STATUS, hdr->peer);
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}
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static void ubus_process_msg(struct ubus_context *ctx, struct ubus_msghdr *hdr)
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{
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struct ubus_request *req;
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switch(hdr->type) {
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case UBUS_MSG_STATUS:
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req = ubus_find_request(ctx, hdr->seq, hdr->peer);
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if (!req)
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break;
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ubus_process_req_status(req, hdr);
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break;
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case UBUS_MSG_DATA:
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req = ubus_find_request(ctx, hdr->seq, hdr->peer);
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if (req && (req->data_cb || req->raw_data_cb))
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ubus_req_data(req, hdr);
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break;
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case UBUS_MSG_INVOKE:
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ubus_process_invoke(ctx, hdr);
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break;
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default:
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DPRINTF("unknown message type: %d\n", hdr->type);
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break;
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}
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}
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void ubus_abort_request(struct ubus_context *ctx, struct ubus_request *req)
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{
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if (!list_empty(&req->list))
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return;
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req->cancelled = true;
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ubus_process_req_data(req);
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list_del(&req->list);
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}
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void ubus_complete_request_async(struct ubus_context *ctx, struct ubus_request *req)
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{
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if (!list_empty(&req->list))
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return;
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list_add(&req->list, &ctx->requests);
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}
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static void ubus_handle_data(struct uloop_fd *u, unsigned int events)
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{
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struct ubus_context *ctx = container_of(u, struct ubus_context, sock);
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struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
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while (get_next_msg(ctx, false))
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ubus_process_msg(ctx, hdr);
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if (u->eof)
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ctx->connection_lost(ctx);
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}
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int ubus_complete_request(struct ubus_context *ctx, struct ubus_request *req)
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{
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struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
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if (!list_empty(&req->list))
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list_del(&req->list);
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while (1) {
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if (req->status_msg)
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return req->status_code;
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if (req->cancelled)
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return UBUS_STATUS_NO_DATA;
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if (!get_next_msg(ctx, true))
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return UBUS_STATUS_NO_DATA;
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if (hdr->seq != req->seq || hdr->peer != req->peer)
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goto skip;
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switch(hdr->type) {
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case UBUS_MSG_STATUS:
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return ubus_process_req_status(req, hdr);
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case UBUS_MSG_DATA:
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if (req->data_cb || req->raw_data_cb)
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ubus_req_data(req, hdr);
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continue;
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default:
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goto skip;
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}
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skip:
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ubus_process_msg(ctx, hdr);
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}
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}
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struct ubus_lookup_request {
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struct ubus_request req;
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ubus_lookup_handler_t cb;
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};
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static void ubus_lookup_cb(struct ubus_request *ureq, int type, struct blob_attr *msg)
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{
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struct ubus_lookup_request *req;
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struct ubus_object_data obj;
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struct blob_attr **attr;
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req = container_of(ureq, struct ubus_lookup_request, req);
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attr = ubus_parse_msg(msg);
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if (!attr[UBUS_ATTR_OBJID] || !attr[UBUS_ATTR_OBJPATH] ||
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!attr[UBUS_ATTR_OBJTYPE])
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return;
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memset(&obj, 0, sizeof(obj));
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obj.id = blob_get_int32(attr[UBUS_ATTR_OBJID]);
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obj.path = blob_data(attr[UBUS_ATTR_OBJPATH]);
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obj.type_id = blob_get_int32(attr[UBUS_ATTR_OBJTYPE]);
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obj.signature = attr[UBUS_ATTR_SIGNATURE];
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req->cb(ureq->ctx, &obj, ureq->priv);
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}
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int ubus_lookup(struct ubus_context *ctx, const char *path,
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ubus_lookup_handler_t cb, void *priv)
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{
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struct ubus_lookup_request lookup;
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blob_buf_init(&b, 0);
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if (path)
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blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
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ubus_start_request(ctx, &lookup.req, b.head, UBUS_MSG_LOOKUP, 0);
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lookup.req.raw_data_cb = ubus_lookup_cb;
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lookup.req.priv = priv;
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lookup.cb = cb;
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return ubus_complete_request(ctx, &lookup.req);
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}
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static void ubus_lookup_id_cb(struct ubus_request *req, int type, struct blob_attr *msg)
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{
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struct blob_attr **attr;
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uint32_t *id = req->priv;
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attr = ubus_parse_msg(msg);
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if (!attr[UBUS_ATTR_OBJID])
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return;
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*id = blob_get_int32(attr[UBUS_ATTR_OBJID]);
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}
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int ubus_lookup_id(struct ubus_context *ctx, const char *path, uint32_t *id)
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{
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struct ubus_request req;
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blob_buf_init(&b, 0);
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if (path)
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blob_put_string(&b, UBUS_ATTR_OBJPATH, path);
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ubus_start_request(ctx, &req, b.head, UBUS_MSG_LOOKUP, 0);
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req.raw_data_cb = ubus_lookup_id_cb;
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req.priv = id;
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return ubus_complete_request(ctx, &req);
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}
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int ubus_send_reply(struct ubus_context *ctx, struct ubus_request_data *req,
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struct blob_attr *msg)
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{
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int ret;
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_OBJID, req->object);
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blob_put(&b, UBUS_ATTR_DATA, blob_data(msg), blob_len(msg));
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ret = ubus_send_msg(ctx, req->seq, b.head, UBUS_MSG_DATA, req->peer);
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if (ret < 0)
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return UBUS_STATUS_NO_DATA;
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return 0;
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}
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void ubus_invoke_async(struct ubus_context *ctx, uint32_t obj, const char *method,
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struct blob_attr *msg, struct ubus_request *req)
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{
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blob_buf_init(&b, 0);
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blob_put_int32(&b, UBUS_ATTR_OBJID, obj);
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blob_put_string(&b, UBUS_ATTR_METHOD, method);
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if (msg)
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blob_put(&b, UBUS_ATTR_DATA, blob_data(msg), blob_len(msg));
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ubus_start_request(ctx, req, b.head, UBUS_MSG_INVOKE, obj);
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}
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int ubus_invoke(struct ubus_context *ctx, uint32_t obj, const char *method,
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struct blob_attr *msg, ubus_data_handler_t cb, void *priv)
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{
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struct ubus_request req;
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ubus_invoke_async(ctx, obj, method, msg, &req);
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req.data_cb = cb;
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req.priv = priv;
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return ubus_complete_request(ctx, &req);
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}
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static void ubus_publish_cb(struct ubus_request *req, int type, struct blob_attr *msg)
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{
|
|
struct ubus_object *obj = req->priv;
|
|
|
|
ubus_parse_msg(msg);
|
|
|
|
if (!attrbuf[UBUS_ATTR_OBJID])
|
|
return;
|
|
|
|
obj->id = blob_get_int32(attrbuf[UBUS_ATTR_OBJID]);
|
|
|
|
if (attrbuf[UBUS_ATTR_OBJTYPE])
|
|
obj->type->id = blob_get_int32(attrbuf[UBUS_ATTR_OBJTYPE]);
|
|
|
|
obj->avl.key = &obj->id;
|
|
avl_insert(&req->ctx->objects, &obj->avl);
|
|
}
|
|
|
|
static bool ubus_push_table_data(const struct ubus_signature **sig, int *rem, bool array)
|
|
{
|
|
const struct ubus_signature *cur;
|
|
bool nest_type;
|
|
void *nest;
|
|
|
|
while (rem) {
|
|
cur = (*sig)++;
|
|
(*rem)--;
|
|
switch(cur->type) {
|
|
case UBUS_SIGNATURE_END:
|
|
return !array;
|
|
case BLOBMSG_TYPE_INT32:
|
|
case BLOBMSG_TYPE_STRING:
|
|
blobmsg_add_u32(&b, cur->name, cur->type);
|
|
break;
|
|
case BLOBMSG_TYPE_TABLE:
|
|
case BLOBMSG_TYPE_ARRAY:
|
|
nest_type = cur->type == BLOBMSG_TYPE_ARRAY;
|
|
nest = blobmsg_open_nested(&b, cur->name, nest_type);
|
|
if (!ubus_push_table_data(sig, rem, nest_type))
|
|
return false;
|
|
blobmsg_close_table(&b, nest);
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
if (array)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool ubus_push_object_type(struct ubus_object_type *type)
|
|
{
|
|
void *s, *m;
|
|
int rem = type->n_signature;
|
|
const struct ubus_signature *sig = type->signature;
|
|
|
|
s = blob_nest_start(&b, UBUS_ATTR_SIGNATURE);
|
|
while (rem) {
|
|
if (sig->type != UBUS_SIGNATURE_METHOD)
|
|
return false;
|
|
|
|
m = blobmsg_open_table(&b, sig->name);
|
|
|
|
sig++;
|
|
rem--;
|
|
if (!ubus_push_table_data(&sig, &rem, false))
|
|
return false;
|
|
|
|
blobmsg_close_table(&b, m);
|
|
}
|
|
blob_nest_end(&b, s);
|
|
|
|
return true;
|
|
}
|
|
|
|
int ubus_publish(struct ubus_context *ctx, struct ubus_object *obj)
|
|
{
|
|
struct ubus_request req;
|
|
int ret;
|
|
|
|
if (obj->id || !obj->name || !obj->type)
|
|
return UBUS_STATUS_INVALID_ARGUMENT;
|
|
|
|
blob_buf_init(&b, 0);
|
|
blob_put_string(&b, UBUS_ATTR_OBJPATH, obj->name);
|
|
|
|
if (obj->type->id)
|
|
blob_put_int32(&b, UBUS_ATTR_OBJTYPE, obj->type->id);
|
|
else if (!ubus_push_object_type(obj->type))
|
|
return UBUS_STATUS_INVALID_ARGUMENT;
|
|
|
|
ubus_start_request(ctx, &req, b.head, UBUS_MSG_PUBLISH, 0);
|
|
req.raw_data_cb = ubus_publish_cb;
|
|
req.priv = obj;
|
|
ret = ubus_complete_request(ctx, &req);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!obj->id)
|
|
return UBUS_STATUS_NO_DATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ubus_default_connection_lost(struct ubus_context *ctx)
|
|
{
|
|
if (ctx->sock.registered)
|
|
uloop_end();
|
|
}
|
|
|
|
struct ubus_context *ubus_connect(const char *path)
|
|
{
|
|
struct ubus_context *ctx;
|
|
struct {
|
|
struct ubus_msghdr hdr;
|
|
struct blob_attr data;
|
|
} hdr;
|
|
struct blob_attr *buf;
|
|
|
|
if (!path)
|
|
path = UBUS_UNIX_SOCKET;
|
|
|
|
ctx = calloc(1, sizeof(*ctx));
|
|
if (!ctx)
|
|
goto error;
|
|
|
|
ctx->sock.fd = usock(USOCK_UNIX, path, NULL);
|
|
if (ctx->sock.fd < 0)
|
|
goto error_free;
|
|
|
|
ctx->sock.cb = ubus_handle_data;
|
|
|
|
if (read(ctx->sock.fd, &hdr, sizeof(hdr)) != sizeof(hdr))
|
|
goto error_close;
|
|
|
|
if (!ubus_validate_hdr(&hdr.hdr))
|
|
goto error_close;
|
|
|
|
if (hdr.hdr.type != UBUS_MSG_HELLO)
|
|
goto error_close;
|
|
|
|
buf = calloc(1, blob_raw_len(&hdr.data));
|
|
if (!buf)
|
|
goto error_close;
|
|
|
|
memcpy(buf, &hdr.data, sizeof(hdr.data));
|
|
if (read(ctx->sock.fd, blob_data(buf), blob_len(buf)) != blob_len(buf))
|
|
goto error_free_buf;
|
|
|
|
ctx->local_id = hdr.hdr.peer;
|
|
free(buf);
|
|
|
|
ctx->connection_lost = ubus_default_connection_lost;
|
|
|
|
INIT_LIST_HEAD(&ctx->requests);
|
|
avl_init(&ctx->objects, ubus_cmp_id, false, NULL);
|
|
|
|
if (!ctx->local_id)
|
|
goto error_close;
|
|
|
|
return ctx;
|
|
|
|
error_free_buf:
|
|
free(buf);
|
|
error_close:
|
|
close(ctx->sock.fd);
|
|
error_free:
|
|
free(ctx);
|
|
error:
|
|
return NULL;
|
|
}
|
|
|
|
void ubus_free(struct ubus_context *ctx)
|
|
{
|
|
close(ctx->sock.fd);
|
|
free(ctx);
|
|
}
|