2 * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/types.h>
16 #include <sys/socket.h>
22 #include <libubox/usock.h>
23 #include <libubox/blob.h>
24 #include <libubox/blobmsg.h>
27 #include "libubus-internal.h"
29 #define STATIC_IOV(_var) { .iov_base = (char *) &(_var), .iov_len = sizeof(_var) }
31 static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
32 [UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
33 [UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
34 [UBUS_ATTR_OBJPATH] = { .type = BLOB_ATTR_STRING },
35 [UBUS_ATTR_METHOD] = { .type = BLOB_ATTR_STRING },
36 [UBUS_ATTR_ACTIVE] = { .type = BLOB_ATTR_INT8 },
37 [UBUS_ATTR_NO_REPLY] = { .type = BLOB_ATTR_INT8 },
38 [UBUS_ATTR_SUBSCRIBERS] = { .type = BLOB_ATTR_NESTED },
41 static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
43 __hidden struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
45 blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
49 static void wait_data(int fd, bool write)
51 struct pollfd pfd = { .fd = fd };
53 pfd.events = write ? POLLOUT : POLLIN;
57 static int writev_retry(int fd, struct iovec *iov, int iov_len)
62 int cur_len = writev(fd, iov, iov_len);
76 while (cur_len >= iov->iov_len) {
77 cur_len -= iov->iov_len;
83 iov->iov_len -= cur_len;
86 /* Should never reach here */
90 int __hidden ubus_send_msg(struct ubus_context *ctx, uint32_t seq,
91 struct blob_attr *msg, int cmd, uint32_t peer)
93 struct ubus_msghdr hdr;
94 struct iovec iov[2] = {
105 blob_buf_init(&b, 0);
109 iov[1].iov_base = (char *) msg;
110 iov[1].iov_len = blob_raw_len(msg);
112 ret = writev_retry(ctx->sock.fd, iov, ARRAY_SIZE(iov));
114 ctx->sock.eof = true;
119 static int recv_retry(int fd, struct iovec *iov, bool wait)
121 int bytes, total = 0;
123 while (iov->iov_len > 0) {
125 wait_data(fd, false);
127 bytes = read(fd, iov->iov_base, iov->iov_len);
145 iov->iov_len -= bytes;
146 iov->iov_base += bytes;
153 static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
155 if (hdr->version != 0)
158 if (blob_raw_len(hdr->data) < sizeof(*hdr->data))
161 if (blob_pad_len(hdr->data) > UBUS_MAX_MSGLEN)
167 static bool get_next_msg(struct ubus_context *ctx)
169 struct iovec iov = STATIC_IOV(ctx->msgbuf.hdr);
172 /* receive header + start attribute */
173 iov.iov_len += sizeof(struct blob_attr);
174 r = recv_retry(ctx->sock.fd, &iov, false);
177 ctx->sock.eof = true;
182 iov.iov_len = blob_len(ctx->msgbuf.hdr.data);
183 if (iov.iov_len > 0 && !recv_retry(ctx->sock.fd, &iov, true))
186 return ubus_validate_hdr(&ctx->msgbuf.hdr);
189 void __hidden ubus_handle_data(struct uloop_fd *u, unsigned int events)
191 struct ubus_context *ctx = container_of(u, struct ubus_context, sock);
192 struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
194 while (get_next_msg(ctx)) {
195 ubus_process_msg(ctx, hdr);
201 ctx->connection_lost(ctx);
205 ubus_refresh_state(struct ubus_context *ctx)
207 struct ubus_object *obj, *tmp;
208 struct ubus_object **objs;
211 /* clear all type IDs, they need to be registered again */
212 avl_for_each_element(&ctx->objects, obj, avl)
216 /* push out all objects again */
217 objs = alloca(ctx->objects.count * sizeof(*objs));
218 avl_remove_all_elements(&ctx->objects, obj, avl, tmp) {
223 for (n = i, i = 0; i < n; i++)
224 ubus_add_object(ctx, objs[i]);
227 int ubus_reconnect(struct ubus_context *ctx, const char *path)
230 struct ubus_msghdr hdr;
231 struct blob_attr data;
233 struct blob_attr *buf;
234 int ret = UBUS_STATUS_UNKNOWN_ERROR;
237 path = UBUS_UNIX_SOCKET;
239 if (ctx->sock.fd >= 0) {
240 if (ctx->sock.registered)
241 uloop_fd_delete(&ctx->sock);
246 ctx->sock.fd = usock(USOCK_UNIX, path, NULL);
247 if (ctx->sock.fd < 0)
248 return UBUS_STATUS_CONNECTION_FAILED;
250 if (read(ctx->sock.fd, &hdr, sizeof(hdr)) != sizeof(hdr))
253 if (!ubus_validate_hdr(&hdr.hdr))
256 if (hdr.hdr.type != UBUS_MSG_HELLO)
259 buf = calloc(1, blob_raw_len(&hdr.data));
263 memcpy(buf, &hdr.data, sizeof(hdr.data));
264 if (read(ctx->sock.fd, blob_data(buf), blob_len(buf)) != blob_len(buf))
267 ctx->local_id = hdr.hdr.peer;
271 ret = UBUS_STATUS_OK;
272 fcntl(ctx->sock.fd, F_SETFL, fcntl(ctx->sock.fd, F_GETFL) | O_NONBLOCK);
274 ubus_refresh_state(ctx);