Add initial version

The initial version implements the basic functionality
of the client/server communication and lease management.

For now, one lease is created per valid connector (dependent
on CRTC availablity).

Bug-AGL: SPEC-3729

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Change-Id: I2b37a892742cc22bdc53a5172c8ad3d8a7bb5e66

7 files changed, 257 insertions, 0 deletions

diff --git a/common/log.c b/common/log.c
new file mode 100644
index 0000000..f3f8899
--- /dev/null
+++ b/common/log.c
@@ -0,0 +1,38 @@
+/* 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 "log.h"
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+static bool debug_log = false;
+
+void dlm_log_enable_debug(bool enable)
+{
+	debug_log = enable;
+}
+
+void dlm_log_print(bool debug, FILE *stream, char *fmt, ...)
+{
+	if (debug && !debug_log)
+		return;
+
+	va_list argl;
+	va_start(argl, fmt);
+	vfprintf(stream, fmt, argl);
+	va_end(argl);
+}
diff --git a/common/log.h b/common/log.h
new file mode 100644
index 0000000..cd0c0e3
--- /dev/null
+++ b/common/log.h
@@ -0,0 +1,33 @@
+/* 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.
+ */
+
+#ifndef LOG_H
+#define LOG_H
+
+#include <stdbool.h>
+#include <stdio.h>
+
+#define DEBUG_LOG(FMT, ...) \
+	dlm_log_print(true, stdout, "DEBUG: %s: " FMT, __func__, ##__VA_ARGS__)
+#define INFO_LOG(FMT, ...) \
+	dlm_log_print(false, stdout, "INFO: " FMT, ##__VA_ARGS__)
+#define WARN_LOG(FMT, ...) \
+	dlm_log_print(false, stderr, "WARNING: " FMT, ##__VA_ARGS__)
+#define ERROR_LOG(FMT, ...) \
+	dlm_log_print(false, stderr, "ERROR: " FMT, ##__VA_ARGS__)
+
+void dlm_log_enable_debug(bool enable);
+void dlm_log_print(bool debug, FILE *stream, char *fmt, ...);
+#endif
diff --git a/common/meson.build b/common/meson.build
new file mode 100644
index 0000000..e465fa5
--- /dev/null
+++ b/common/meson.build
@@ -0,0 +1,22 @@
+libdlmcommon_sources = [
+        'socket-path.c',
+        'log.c'
+]
+
+libdlmcommon_inc = [include_directories('.')]
+
+if enable_tests
+    libdlmcommon_inc += include_directories('test')
+    libdlmcommon_sources += ['test/test-helpers.c']
+endif
+
+libdlmcommon = static_library(
+        'common',
+        sources: libdlmcommon_sources,
+        include_directories : configuration_inc,
+)
+
+dlmcommon_dep = declare_dependency(
+    link_with : libdlmcommon,
+    include_directories : libdlmcommon_inc
+)
diff --git a/common/socket-path.c b/common/socket-path.c
new file mode 100644
index 0000000..7a412da
--- /dev/null
+++ b/common/socket-path.c
@@ -0,0 +1,48 @@
+/* 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 "socket-path.h"
+#include "config.h"
+#include "log.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define RUNTIME_PATH DLM_DEFAULT_RUNTIME_PATH
+
+bool sockaddr_set_lease_server_path(struct sockaddr_un *sa,
+				    const char *lease_name)
+{
+	int maxlen = sizeof(sa->sun_path);
+	char *socket_dir = getenv("DLM_RUNTIME_PATH") ?: RUNTIME_PATH;
+
+	int len =
+	    snprintf(sa->sun_path, maxlen, "%s/%s", socket_dir, lease_name);
+
+	if (len < 0) {
+		DEBUG_LOG("Socket path creation failed: %s\n", strerror(errno));
+		return false;
+	}
+	if (len >= maxlen) {
+		errno = ENAMETOOLONG;
+		DEBUG_LOG("Socket directoy path too long. "
+			  "Full path to socket must be less than %d bytes\n",
+			  maxlen);
+		return false;
+	}
+	return true;
+}
diff --git a/common/socket-path.h b/common/socket-path.h
new file mode 100644
index 0000000..b05c60f
--- /dev/null
+++ b/common/socket-path.h
@@ -0,0 +1,26 @@
+/* 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.
+ */
+
+#ifndef SOCKET_PATH_H
+#define SOCKET_PATH_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/un.h>
+
+bool sockaddr_set_lease_server_path(struct sockaddr_un *dest,
+				    const char *lease_name);
+
+#endif
diff --git a/common/test/test-helpers.c b/common/test/test-helpers.c
new file mode 100644
index 0000000..ea37a89
--- /dev/null
+++ b/common/test/test-helpers.c
@@ -0,0 +1,56 @@
+/* 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 "test-helpers.h"
+#include <check.h>
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+int get_dummy_fd(void)
+{
+	return dup(STDIN_FILENO);
+}
+
+void check_fd_equality(int fd1, int fd2)
+{
+	struct stat s1, s2;
+	ck_assert_int_eq(fstat(fd1, &s1), 0);
+	ck_assert_int_eq(fstat(fd2, &s2), 0);
+	ck_assert_int_eq(s1.st_dev, s2.st_dev);
+	ck_assert_int_eq(s1.st_ino, s2.st_ino);
+}
+
+void check_fd_is_open(int fd)
+{
+	struct stat st;
+	ck_assert_int_eq(fstat(fd, &st), 0);
+}
+
+void check_fd_is_closed(int fd)
+{
+	struct stat st;
+	ck_assert_int_ne(fstat(fd, &st), 0);
+	ck_assert_int_eq(errno, EBADF);
+}
+
+void check_uint_array_eq(const uint32_t *a, const uint32_t *b, int cnt)
+{
+	for (int i = 0; i < cnt; i++) {
+		ck_assert_msg(a[i] == b[i], "Array diff at index %d (%u != %u)",
+			      i, a[i], b[i]);
+	}
+}
diff --git a/common/test/test-helpers.h b/common/test/test-helpers.h
new file mode 100644
index 0000000..8886acd
--- /dev/null
+++ b/common/test/test-helpers.h
@@ -0,0 +1,34 @@
+/* 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.
+ */
+
+#ifndef TEST_HELPERS_H
+#define TEST_HELPERS_H
+
+#include <stdint.h>
+
+#define UNUSED(x) (void)(x)
+#define ARRAY_LEN(x) ((int)(sizeof(x) / sizeof(x[0])))
+
+/* Get a vaild fd to use a a placeholder.
+ * The dummy fd should never be used for anything other
+ * than comparing the fd value or the referenced file description. */
+int get_dummy_fd(void);
+
+void check_fd_equality(int fd1, int fd2);
+void check_fd_is_open(int fd);
+void check_fd_is_closed(int fd);
+
+void check_uint_array_eq(const uint32_t *a, const uint32_t *b, int cnt);
+#endif