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/* Copyright 2020-2021 IGEL Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "dlmclient.h"
#include "dlm-protocol.h"
#include "log.h"
#include "socket-path.h"
#include <assert.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
void dlm_enable_debug_log(bool enable)
{
dlm_log_enable_debug(enable);
}
struct dlm_lease {
int dlm_server_sock;
int lease_fd;
};
static bool lease_connect(struct dlm_lease *lease, const char *name)
{
struct sockaddr_un sa = {
.sun_family = AF_UNIX,
};
if (!sockaddr_set_lease_server_path(&sa, name))
return false;
int dlm_server_sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (dlm_server_sock < 0) {
DEBUG_LOG("Socket creation failed: %s\n", strerror(errno));
return false;
}
while (connect(dlm_server_sock, (struct sockaddr *)&sa,
sizeof(struct sockaddr_un)) == -1) {
if (errno == EINTR)
continue;
DEBUG_LOG("Cannot connect to %s: %s\n", sa.sun_path,
strerror(errno));
close(dlm_server_sock);
return false;
}
lease->dlm_server_sock = dlm_server_sock;
return true;
}
static bool lease_send_request(struct dlm_lease *lease, enum dlm_opcode opcode)
{
struct dlm_client_request request = {
.opcode = opcode,
};
if (!send_dlm_client_request(lease->dlm_server_sock, &request)) {
DEBUG_LOG("Socket data send error: %s\n", strerror(errno));
return false;
}
return true;
}
static bool lease_recv_fd(struct dlm_lease *lease)
{
char ctrl_buf[CMSG_SPACE(sizeof(int))] = {0};
char data[1] = {0};
struct iovec iov[1];
iov[0].iov_base = data;
iov[0].iov_len = sizeof(data);
struct msghdr msg = {
.msg_control = ctrl_buf,
.msg_controllen = CMSG_SPACE(sizeof(int)),
.msg_iov = iov,
.msg_iovlen = 1,
};
int ret;
while ((ret = recvmsg(lease->dlm_server_sock, &msg, 0)) <= 0) {
if (ret == 0) {
errno = EACCES;
DEBUG_LOG("Request rejected by DRM lease manager\n");
// TODO: Report why the request was rejected.
return false;
}
if (errno != EINTR) {
DEBUG_LOG("Socket data receive error: %s\n",
strerror(errno));
return false;
}
}
lease->lease_fd = -1;
struct cmsghdr *cmsg;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
int nfds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
int *fds = (int *)CMSG_DATA(cmsg);
if (nfds == 1) {
lease->lease_fd = fds[0];
break;
}
DEBUG_LOG(
"Expected 1 fd from lease manager. Received %d\n",
nfds);
/* Close any unexpected fds so we don't leak them. */
for (int i = 0; i < nfds; i++)
close(fds[i]);
break;
}
}
if (lease->lease_fd < 0) {
DEBUG_LOG("Expected data not received from lease manager\n");
errno = EPROTO;
return false;
}
return true;
}
struct dlm_lease *dlm_get_lease(const char *name)
{
int saved_errno;
struct dlm_lease *lease = calloc(1, sizeof(struct dlm_lease));
if (!lease) {
DEBUG_LOG("can't allocate memory : %s\n", strerror(errno));
return NULL;
}
if (!lease_connect(lease, name)) {
free(lease);
return NULL;
}
if (!lease_send_request(lease, DLM_GET_LEASE))
goto err;
if (!lease_recv_fd(lease))
goto err;
return lease;
err:
saved_errno = errno;
dlm_release_lease(lease);
errno = saved_errno;
return NULL;
}
void dlm_release_lease(struct dlm_lease *lease)
{
if (!lease)
return;
lease_send_request(lease, DLM_RELEASE_LEASE);
close(lease->lease_fd);
close(lease->dlm_server_sock);
free(lease);
}
int dlm_lease_fd(struct dlm_lease *lease)
{
if (!lease)
return -1;
return lease->lease_fd;
}
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