/*
- * Copyright (C) 2011-2012 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* GNU General Public License for more details.
*/
+#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/socket.h>
#define STATIC_IOV(_var) { .iov_base = (char *) &(_var), .iov_len = sizeof(_var) }
+#define UBUS_MSGBUF_REDUCTION_INTERVAL 16
+
static const struct blob_attr_info ubus_policy[UBUS_ATTR_MAX] = {
[UBUS_ATTR_STATUS] = { .type = BLOB_ATTR_INT32 },
[UBUS_ATTR_OBJID] = { .type = BLOB_ATTR_INT32 },
[UBUS_ATTR_METHOD] = { .type = BLOB_ATTR_STRING },
[UBUS_ATTR_ACTIVE] = { .type = BLOB_ATTR_INT8 },
[UBUS_ATTR_NO_REPLY] = { .type = BLOB_ATTR_INT8 },
+ [UBUS_ATTR_SUBSCRIBERS] = { .type = BLOB_ATTR_NESTED },
};
static struct blob_attr *attrbuf[UBUS_ATTR_MAX];
-__hidden struct blob_attr **ubus_parse_msg(struct blob_attr *msg)
+__hidden struct blob_attr **ubus_parse_msg(struct blob_attr *msg, size_t len)
{
- blob_parse(msg, attrbuf, ubus_policy, UBUS_ATTR_MAX);
+ blob_parse_untrusted(msg, len, attrbuf, ubus_policy, UBUS_ATTR_MAX);
return attrbuf;
}
struct pollfd pfd = { .fd = fd };
pfd.events = write ? POLLOUT : POLLIN;
- poll(&pfd, 1, 0);
+ poll(&pfd, 1, -1);
}
-static int writev_retry(int fd, struct iovec *iov, int iov_len)
+static int writev_retry(int fd, struct iovec *iov, int iov_len, int sock_fd)
{
+ uint8_t fd_buf[CMSG_SPACE(sizeof(int))] = { 0 };
+ struct msghdr msghdr = { 0 };
+ struct cmsghdr *cmsg;
int len = 0;
+ int *pfd;
+
+ msghdr.msg_iov = iov,
+ msghdr.msg_iovlen = iov_len,
+ msghdr.msg_control = fd_buf;
+ msghdr.msg_controllen = sizeof(fd_buf);
+
+ cmsg = CMSG_FIRSTHDR(&msghdr);
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+
+ pfd = (int *) CMSG_DATA(cmsg);
+ msghdr.msg_controllen = cmsg->cmsg_len;
do {
- int cur_len = writev(fd, iov, iov_len);
+ ssize_t cur_len;
+
+ if (sock_fd < 0) {
+ msghdr.msg_control = NULL;
+ msghdr.msg_controllen = 0;
+ } else {
+ *pfd = sock_fd;
+ }
+
+ cur_len = sendmsg(fd, &msghdr, 0);
if (cur_len < 0) {
switch(errno) {
case EAGAIN:
}
continue;
}
+
+ if (len > 0)
+ sock_fd = -1;
+
len += cur_len;
- while (cur_len >= iov->iov_len) {
+ while (cur_len >= (ssize_t) iov->iov_len) {
cur_len -= iov->iov_len;
iov_len--;
iov++;
- if (!cur_len || !iov_len)
+ if (!iov_len)
return len;
}
+ iov->iov_base += cur_len;
iov->iov_len -= cur_len;
+ msghdr.msg_iov = iov;
+ msghdr.msg_iovlen = iov_len;
} while (1);
+
+ /* Should never reach here */
+ return -1;
}
int __hidden ubus_send_msg(struct ubus_context *ctx, uint32_t seq,
- struct blob_attr *msg, int cmd, uint32_t peer)
+ struct blob_attr *msg, int cmd, uint32_t peer, int fd)
{
struct ubus_msghdr hdr;
struct iovec iov[2] = {
STATIC_IOV(hdr)
};
+ int ret;
hdr.version = 0;
hdr.type = cmd;
- hdr.seq = seq;
- hdr.peer = peer;
+ hdr.seq = cpu_to_be16(seq);
+ hdr.peer = cpu_to_be32(peer);
if (!msg) {
blob_buf_init(&b, 0);
iov[1].iov_base = (char *) msg;
iov[1].iov_len = blob_raw_len(msg);
- return writev_retry(ctx->sock.fd, iov, ARRAY_SIZE(iov));
+ ret = writev_retry(ctx->sock.fd, iov, ARRAY_SIZE(iov), fd);
+ if (ret < 0)
+ ctx->sock.eof = true;
+
+ if (fd >= 0)
+ close(fd);
+
+ return ret;
}
-static bool recv_retry(int fd, struct iovec *iov, bool wait)
+static int recv_retry(struct ubus_context *ctx, struct iovec *iov, bool wait, int *recv_fd)
{
+ uint8_t fd_buf[CMSG_SPACE(sizeof(int))] = { 0 };
+ struct msghdr msghdr = { 0 };
+ struct cmsghdr *cmsg;
+ int total = 0;
int bytes;
+ int *pfd;
+ int fd;
+
+ fd = ctx->sock.fd;
+
+ msghdr.msg_iov = iov,
+ msghdr.msg_iovlen = 1,
+ msghdr.msg_control = fd_buf;
+ msghdr.msg_controllen = sizeof(fd_buf);
+
+ cmsg = CMSG_FIRSTHDR(&msghdr);
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+
+ pfd = (int *) CMSG_DATA(cmsg);
while (iov->iov_len > 0) {
- if (wait)
- wait_data(fd, false);
+ if (recv_fd) {
+ msghdr.msg_control = fd_buf;
+ msghdr.msg_controllen = cmsg->cmsg_len;
+ } else {
+ msghdr.msg_control = NULL;
+ msghdr.msg_controllen = 0;
+ }
+
+ *pfd = -1;
+ bytes = recvmsg(fd, &msghdr, 0);
+ if (!bytes)
+ return -1;
- bytes = read(fd, iov->iov_base, iov->iov_len);
if (bytes < 0) {
bytes = 0;
- if (uloop_cancelled)
- return false;
if (errno == EINTR)
continue;
if (errno != EAGAIN)
- return false;
+ return -1;
}
if (!wait && !bytes)
- return false;
+ return 0;
+
+ if (recv_fd)
+ *recv_fd = *pfd;
+
+ recv_fd = NULL;
wait = true;
iov->iov_len -= bytes;
iov->iov_base += bytes;
+ total += bytes;
+
+ if (iov->iov_len > 0)
+ wait_data(fd, false);
}
- return true;
+ return total;
}
-static bool ubus_validate_hdr(struct ubus_msghdr *hdr)
+bool ubus_validate_hdr(struct ubus_msghdr *hdr)
{
+ struct blob_attr *data = (struct blob_attr *) (hdr + 1);
+
if (hdr->version != 0)
return false;
- if (blob_raw_len(hdr->data) < sizeof(*hdr->data))
+ if (blob_raw_len(data) < sizeof(*data))
return false;
- if (blob_pad_len(hdr->data) > UBUS_MAX_MSGLEN)
+ if (blob_pad_len(data) > UBUS_MAX_MSGLEN)
+ return false;
+
+ return true;
+}
+
+static bool alloc_msg_buf(struct ubus_context *ctx, int len)
+{
+ void *ptr;
+ int buf_len = ctx->msgbuf_data_len;
+ int rem;
+
+ if (!ctx->msgbuf.data)
+ buf_len = 0;
+
+ rem = (len % UBUS_MSG_CHUNK_SIZE);
+ if (rem > 0)
+ len += UBUS_MSG_CHUNK_SIZE - rem;
+
+ if (len < buf_len &&
+ ++ctx->msgbuf_reduction_counter > UBUS_MSGBUF_REDUCTION_INTERVAL) {
+ ctx->msgbuf_reduction_counter = 0;
+ buf_len = 0;
+ }
+
+ if (len <= buf_len)
+ return true;
+
+ ptr = realloc(ctx->msgbuf.data, len);
+ if (!ptr)
return false;
+ ctx->msgbuf.data = ptr;
+ ctx->msgbuf_data_len = len;
return true;
}
-static bool get_next_msg(struct ubus_context *ctx)
+static bool get_next_msg(struct ubus_context *ctx, int *recv_fd)
{
- struct iovec iov = STATIC_IOV(ctx->msgbuf.hdr);
+ struct {
+ struct ubus_msghdr hdr;
+ struct blob_attr data;
+ } hdrbuf;
+ struct iovec iov = STATIC_IOV(hdrbuf);
+ int len;
+ int r;
/* receive header + start attribute */
- iov.iov_len += sizeof(struct blob_attr);
- if (!recv_retry(ctx->sock.fd, &iov, false))
+ r = recv_retry(ctx, &iov, false, recv_fd);
+ if (r <= 0) {
+ if (r < 0)
+ ctx->sock.eof = true;
+
+ return false;
+ }
+
+ hdrbuf.hdr.seq = be16_to_cpu(hdrbuf.hdr.seq);
+ hdrbuf.hdr.peer = be32_to_cpu(hdrbuf.hdr.peer);
+
+ if (!ubus_validate_hdr(&hdrbuf.hdr))
return false;
- iov.iov_len = blob_len(ctx->msgbuf.hdr.data);
- if (iov.iov_len > 0 && !recv_retry(ctx->sock.fd, &iov, true))
+ len = blob_raw_len(&hdrbuf.data);
+ if (!alloc_msg_buf(ctx, len))
+ return false;
+
+ memcpy(&ctx->msgbuf.hdr, &hdrbuf.hdr, sizeof(hdrbuf.hdr));
+ memcpy(ctx->msgbuf.data, &hdrbuf.data, sizeof(hdrbuf.data));
+
+ iov.iov_base = (char *)ctx->msgbuf.data + sizeof(hdrbuf.data);
+ iov.iov_len = blob_len(ctx->msgbuf.data);
+ if (iov.iov_len > 0 &&
+ recv_retry(ctx, &iov, true, NULL) <= 0)
return false;
- return ubus_validate_hdr(&ctx->msgbuf.hdr);
+ return true;
}
void __hidden ubus_handle_data(struct uloop_fd *u, unsigned int events)
{
struct ubus_context *ctx = container_of(u, struct ubus_context, sock);
- struct ubus_msghdr *hdr = &ctx->msgbuf.hdr;
+ int recv_fd = -1;
+
+ while (1) {
+ if (!ctx->stack_depth)
+ ctx->pending_timer.cb(&ctx->pending_timer);
- while (get_next_msg(ctx)) {
- ubus_process_msg(ctx, hdr);
- if (uloop_cancelled)
+ if (!get_next_msg(ctx, &recv_fd))
+ break;
+ ubus_process_msg(ctx, &ctx->msgbuf, recv_fd);
+ if (uloop_cancelling() || ctx->cancel_poll)
break;
}
+ if (!ctx->stack_depth)
+ ctx->pending_timer.cb(&ctx->pending_timer);
+
if (u->eof)
ctx->connection_lost(ctx);
}
+void __hidden ubus_poll_data(struct ubus_context *ctx, int timeout)
+{
+ struct pollfd pfd = {
+ .fd = ctx->sock.fd,
+ .events = POLLIN | POLLERR,
+ };
+
+ ctx->cancel_poll = false;
+ poll(&pfd, 1, timeout ? timeout : -1);
+ ubus_handle_data(&ctx->sock, ULOOP_READ);
+}
+
+static void
+ubus_auto_sub_lookup(struct ubus_context *ctx, struct ubus_object_data *obj,
+ void *priv)
+{
+ struct ubus_subscriber *s;
+
+ list_for_each_entry(s, &ctx->auto_subscribers, list)
+ if (s->new_obj_cb(ctx, s, obj->path))
+ ubus_subscribe(ctx, s, obj->id);
+}
+
+static void
+ubus_refresh_auto_subscribe(struct ubus_context *ctx)
+{
+ struct ubus_event_handler *ev = &ctx->auto_subscribe_event_handler;
+
+ if (list_empty(&ctx->auto_subscribers))
+ return;
+
+ ubus_register_event_handler(ctx, ev, "ubus.object.add");
+ ubus_lookup(ctx, NULL, ubus_auto_sub_lookup, NULL);
+}
+
static void
ubus_refresh_state(struct ubus_context *ctx)
{
struct ubus_object *obj, *tmp;
+ struct ubus_object **objs;
+ int n, i = 0;
/* clear all type IDs, they need to be registered again */
avl_for_each_element(&ctx->objects, obj, avl)
- obj->type->id = 0;
+ if (obj->type)
+ obj->type->id = 0;
/* push out all objects again */
- avl_for_each_element_safe(&ctx->objects, obj, avl, tmp) {
+ objs = alloca(ctx->objects.count * sizeof(*objs));
+ avl_remove_all_elements(&ctx->objects, obj, avl, tmp) {
+ objs[i++] = obj;
obj->id = 0;
- avl_delete(&ctx->objects, &obj->avl);
- ubus_add_object(ctx, obj);
}
+
+ for (n = i, i = 0; i < n; i++)
+ ubus_add_object(ctx, objs[i]);
+
+ ubus_refresh_auto_subscribe(ctx);
}
int ubus_reconnect(struct ubus_context *ctx, const char *path)
close(ctx->sock.fd);
}
+ ctx->sock.eof = false;
+ ctx->sock.error = false;
ctx->sock.fd = usock(USOCK_UNIX, path, NULL);
if (ctx->sock.fd < 0)
return UBUS_STATUS_CONNECTION_FAILED;
goto out_close;
memcpy(buf, &hdr.data, sizeof(hdr.data));
- if (read(ctx->sock.fd, blob_data(buf), blob_len(buf)) != blob_len(buf))
+ if (read(ctx->sock.fd, blob_data(buf), blob_len(buf)) != (ssize_t) blob_len(buf))
goto out_free;
ctx->local_id = hdr.hdr.peer;
goto out_free;
ret = UBUS_STATUS_OK;
- fcntl(ctx->sock.fd, F_SETFL, fcntl(ctx->sock.fd, F_GETFL) | O_NONBLOCK);
+ fcntl(ctx->sock.fd, F_SETFL, fcntl(ctx->sock.fd, F_GETFL) | O_NONBLOCK | O_CLOEXEC);
ubus_refresh_state(ctx);
projects / project / ubus.git / blobdiff