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/*
* Copyright (C) 2019-2024 iopsys Software Solutions AB
*
* 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
* as published by the Free Software Foundation
*
* Author: Amin Ben Romdhane <amin.benromdhane@iopsys.eu>
*
*/
#include "utils.h"
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#define DEFAULT_POLLING_INTERVAL "60"
#define DEFAULT_CRITICAL_RISE_THRESHOLD "80"
#define DEFAULT_CRITICAL_FALL_THRESHOLD "60"
#define DEFAULT_CRITICAL_MEMORY_LOG_PATH "/var/log/critical_memory.log"
typedef struct mem_info {
unsigned long mem_total;
unsigned long mem_free;
unsigned long buffers;
unsigned long cached;
unsigned long sreclaimable;
} mem_info;
typedef struct memory_ctx {
struct uloop_timeout memory_timer;
bool enable;
bool enable_critical_log;
unsigned int polling_interval;
unsigned int critical_rise_threshold;
unsigned int critical_fall_threshold;
time_t critical_rise_time;
time_t critical_fall_time;
char log_file[512];
} memory_ctx;
static memory_ctx g_memory_ctx = {0};
/*************************************************************
* COMMON FUNCTIONS
**************************************************************/
int sysmngr_meminfo(mem_info *info)
{
FILE *f = NULL;
char *key = NULL, *val = NULL;
char line[256];
if ((f = fopen("/proc/meminfo", "r")) == NULL) {
BBF_ERR("Failed to open '/proc/meminfo' for reading memory info.");
return -1;
}
while (fgets(line, sizeof(line), f)) {
key = strtok(line, " :");
val = strtok(NULL, " ");
if (!key || !val)
continue;
if (!strcasecmp(key, "MemTotal"))
info->mem_total = atol(val);
else if (!strcasecmp(key, "MemFree"))
info->mem_free = atol(val);
else if (!strcasecmp(key, "Buffers"))
info->buffers = atol(val);
else if (!strcasecmp(key, "Cached"))
info->cached = atol(val);
else if (!strcasecmp(key, "SReclaimable"))
info->sreclaimable = atol(val);
}
fclose(f);
return 0;
}
static unsigned int calculate_memory_utilization(void)
{
mem_info info = {0};
if (sysmngr_meminfo(&info) != 0) {
BBF_ERR("Failed to retrieve memory information for utilization calculation");
return 0;
}
unsigned long used_mem = info.mem_total - (info.mem_free + info.buffers + info.cached + info.sreclaimable);
return (unsigned int)((used_mem * 100) / info.mem_total);
}
static void send_memory_critical_state_event(unsigned int mem_utilization)
{
struct blob_buf bb = {0};
char buf[32] = {0};
snprintf(buf, sizeof(buf), "%u", mem_utilization);
memset(&bb, 0, sizeof(struct blob_buf));
blob_buf_init(&bb, 0);
blobmsg_add_string(&bb, "name", "Device.DeviceInfo.MemoryStatus.MemoryMonitor.MemoryCriticalState!");
void *arr = blobmsg_open_array(&bb, "input");
void *table = blobmsg_open_table(&bb, NULL);
blobmsg_add_string(&bb, "path", "MemUtilization");
blobmsg_add_string(&bb, "data", buf);
blobmsg_add_string(&bb, "type", DMT_TYPE[DMT_UNINT]);
blobmsg_close_table(&bb, table);
blobmsg_close_array(&bb, arr);
if (sysmngr_ubus_invoke_sync("bbfdm", "notify_event", bb.head, NULL, NULL)) {
BBF_ERR("Failed to send 'MemoryCriticalState!' event");
} else {
BBF_DEBUG("'MemoryCriticalState!' event sent successfully with utilization at %u%%.", mem_utilization);
}
blob_buf_free(&bb);
}
void generate_log_file(time_t log_time, bool critical_state)
{
FILE *log_file = fopen(g_memory_ctx.log_file, "w"); // Write mode, clears log each time
if (log_file == NULL) {
BBF_ERR("Failed to open log file at '%s'", g_memory_ctx.log_file);
return;
}
fprintf(log_file, "=== Memory Critical State %s at %s ===\n",
critical_state ? "Reached" : "no longer present", ctime(&log_time));
const char *commands[] = {
"top -b -n 1", // Shows a snapshot of top output, including CPU and memory stats
"free", // Shows memory usage statistics in a human-readable format
NULL
};
for (int i = 0; commands[i] != NULL; i++) {
FILE *cmd_output = popen(commands[i], "r"); // flawfinder: ignore
if (cmd_output == NULL) {
fprintf(log_file, "Failed to execute command: %s\n", commands[i]);
BBF_ERR("Failed to execute system command: %s", commands[i]);
continue;
}
fprintf(log_file, "\nOutput of command: %s\n", commands[i]);
char buffer[256];
while (fgets(buffer, sizeof(buffer), cmd_output) != NULL) {
fprintf(log_file, "%s", buffer);
}
pclose(cmd_output);
fprintf(log_file, "\n");
}
fprintf(log_file, "=== End of Critical Memory Log ===\n\n");
fclose(log_file);
BBF_DEBUG("Generated memory log file at: '%s'", g_memory_ctx.log_file);
}
static void run_memory_monitor(void)
{
unsigned int mem_utilization = calculate_memory_utilization();
char buf[32] = {0};
if ((mem_utilization > g_memory_ctx.critical_rise_threshold) &&
(g_memory_ctx.critical_fall_time >= g_memory_ctx.critical_rise_time)) {
BBF_INFO("Memory utilization reached critical threshold: %u%%", mem_utilization);
// Update CriticalRiseTimeStamp to the current time
g_memory_ctx.critical_rise_time = time(NULL);
snprintf(buf, sizeof(buf), "%ld", (long int)g_memory_ctx.critical_rise_time);
sysmngr_uci_set("sysmngr", "memory", "critical_rise_time", buf);
if (g_memory_ctx.enable_critical_log) {
// Generate log into the vendor log file referenced by 'VendorLogFileRef' parameter indicating critical condition is reached
generate_log_file(g_memory_ctx.critical_rise_time, true);
}
// Send 'MemoryCriticalState!' event
send_memory_critical_state_event(mem_utilization);
}
if ((mem_utilization < g_memory_ctx.critical_fall_threshold) &&
(g_memory_ctx.critical_rise_time > g_memory_ctx.critical_fall_time)) {
BBF_INFO("Memory utilization has fallen below critical threshold: %u%%", mem_utilization);
// Update CriticalFallTimeStamp to the current time
g_memory_ctx.critical_fall_time = time(NULL);
snprintf(buf, sizeof(buf), "%ld", (long int)g_memory_ctx.critical_fall_time);
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sysmngr_uci_set("sysmngr", "memory", "critical_fall_time", buf);
if (g_memory_ctx.enable_critical_log) {
// Generate log into the vendor log file referenced by 'VendorLogFileRef' parameter indicating that the critical condition is no longer present
generate_log_file(g_memory_ctx.critical_fall_time, false);
}
}
BBF_INFO("Next memory monitor check scheduled in %d sec...", g_memory_ctx.polling_interval);
uloop_timeout_set(&g_memory_ctx.memory_timer, g_memory_ctx.polling_interval * 1000);
}
static void memory_timer_callback(struct uloop_timeout *timeout)
{
run_memory_monitor();
}
static void fill_global_memory_ctx(void)
{
char buf[16] = {0};
memset(&g_memory_ctx, 0, sizeof(struct memory_ctx));
g_memory_ctx.memory_timer.cb = memory_timer_callback;
sysmngr_uci_get("sysmngr", "memory", "enable", "0", buf, sizeof(buf));
g_memory_ctx.enable = ((int)strtol(buf, NULL, 10) != 0);
BBF_DEBUG("Memory Monitor Config: |Enable| |%d|", g_memory_ctx.enable);
sysmngr_uci_get("sysmngr", "memory", "enable_critical_log", "0", buf, sizeof(buf));
g_memory_ctx.enable_critical_log = ((int)strtol(buf, NULL, 10) != 0);
BBF_DEBUG("Memory Monitor Config: |EnableCriticalLog| |%d|", g_memory_ctx.enable_critical_log);
sysmngr_uci_get("sysmngr", "memory", "polling_interval", DEFAULT_POLLING_INTERVAL, buf, sizeof(buf));
g_memory_ctx.polling_interval = strtoul(buf, NULL, 10);
BBF_DEBUG("Memory Monitor Config: |PollingInterval| |%lu|", g_memory_ctx.polling_interval);
sysmngr_uci_get("sysmngr", "memory", "critical_rise_threshold", DEFAULT_CRITICAL_RISE_THRESHOLD, buf, sizeof(buf));
g_memory_ctx.critical_rise_threshold = strtoul(buf, NULL, 10);
BBF_DEBUG("Memory Monitor Config: |CriticalRiseThreshold| |%lu|", g_memory_ctx.critical_rise_threshold);
sysmngr_uci_get("sysmngr", "memory", "critical_fall_threshold", DEFAULT_CRITICAL_FALL_THRESHOLD, buf, sizeof(buf));
g_memory_ctx.critical_fall_threshold = strtoul(buf, NULL, 10);
BBF_DEBUG("Memory Monitor Config: |CriticalFallThreshold| |%lu|", g_memory_ctx.critical_fall_threshold);
sysmngr_uci_get("sysmngr", "memory", "critical_rise_time", "0", buf, sizeof(buf));
g_memory_ctx.critical_rise_time = strtol(buf, NULL, 10);
BBF_DEBUG("Memory Monitor Config: |CriticalRiseTimeStamp| |%lu|", g_memory_ctx.critical_rise_time);
sysmngr_uci_get("sysmngr", "memory", "critical_fall_time", "0", buf, sizeof(buf));
g_memory_ctx.critical_fall_time = strtol(buf, NULL, 10);
BBF_DEBUG("Memory Monitor Config: |CriticalFallTimeStamp| |%lu|", g_memory_ctx.critical_fall_time);
sysmngr_uci_get("sysmngr", "memory", "file_path", DEFAULT_CRITICAL_MEMORY_LOG_PATH, g_memory_ctx.log_file, sizeof(g_memory_ctx.log_file));
BBF_DEBUG("Memory Monitor Config: |FilePath| |%s|", g_memory_ctx.log_file);
if (!file_exists(g_memory_ctx.log_file)) {
// Create empty file if it doesn't exist
create_empty_file(g_memory_ctx.log_file);
}
}
/*************************************************************
* EXTERNAL APIS
**************************************************************/
void sysmngr_memory_init(void)
{
fill_global_memory_ctx();
if (!g_memory_ctx.enable) {
BBF_INFO("Memory monitoring is disabled.");
return;
}
BBF_INFO("Memory monitoring is enabled");
run_memory_monitor();
}
void sysmngr_memory_clean(void)
{
uloop_timeout_cancel(&g_memory_ctx.memory_timer);
BBF_INFO("Memory monitoring process stopped");
}
/*************************************************************
* GET & SET PARAM
**************************************************************/
static int get_DeviceInfoMemoryStatusMemoryMonitor_Enable(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "enable", "0");
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_Enable(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
bool b;
switch (action) {
case VALUECHECK:
if (bbfdm_validate_boolean(ctx, value))
return FAULT_9007;
break;
case VALUESET:
string_to_bool(value, &b);
dmuci_set_value("sysmngr", "memory", "enable", b ? "1" : "0");
break;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_MemUtilization(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
dmasprintf(value, "%u", calculate_memory_utilization());
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static int get_DeviceInfoMemoryStatusMemoryMonitor_PollingInterval(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "polling_interval", DEFAULT_POLLING_INTERVAL);
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_PollingInterval(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
switch (action) {
case VALUECHECK:
if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,NULL}}, 1))
return FAULT_9007;
break;
case VALUESET:
dmuci_set_value("sysmngr", "memory", "polling_interval", value);
break;
}
return 0;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "critical_rise_threshold", DEFAULT_CRITICAL_RISE_THRESHOLD);
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
switch (action) {
case VALUECHECK:
if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,"100"}}, 1))
return FAULT_9007;
break;
case VALUESET:
dmuci_set_value("sysmngr", "memory", "critical_rise_threshold", value);
break;
}
return 0;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "critical_fall_threshold", DEFAULT_CRITICAL_FALL_THRESHOLD);
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
switch (action) {
case VALUECHECK:
if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,"100"}}, 1))
return FAULT_9007;
break;
case VALUESET:
dmuci_set_value("sysmngr", "memory", "critical_fall_threshold", value);
break;
}
return 0;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseTimeStamp(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
char *rise_time = NULL;
dmuci_get_option_value_string("sysmngr", "memory", "critical_rise_time", &rise_time);
return dm_time_utc_format(DM_STRTOL(rise_time), value);
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallTimeStamp(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
char *fall_time = NULL;
dmuci_get_option_value_string("sysmngr", "memory", "critical_fall_time", &fall_time);
return dm_time_utc_format(DM_STRTOL(fall_time), value);
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_EnableCriticalLog(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "enable_critical_log", "0");
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_EnableCriticalLog(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
bool b;
switch (action) {
case VALUECHECK:
if (bbfdm_validate_boolean(ctx, value))
return FAULT_9007;
break;
case VALUESET:
string_to_bool(value, &b);
dmuci_set_value("sysmngr", "memory", "enable_critical_log", b ? "1" : "0");
break;
}
return 0;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_VendorLogFileRef(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
char *file_path = dmuci_get_option_value_fallback_def("sysmngr", "memory", "file_path", DEFAULT_CRITICAL_MEMORY_LOG_PATH);
if (file_exists(file_path)) {
char file_uri[512] = {0};
// if there is a path, then prepend file:// to it to comply with bbf requirement of file URI
snprintf(file_uri, sizeof(file_uri), "file://%s", file_path);
// get the vendor file path
_bbfdm_get_references(ctx, "Device.DeviceInfo.VendorLogFile.", "Name", file_uri, value);
}
return 0;
}
static int get_DeviceInfoMemoryStatusMemoryMonitor_FilePath(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = dmuci_get_option_value_fallback_def("sysmngr", "memory", "file_path", DEFAULT_CRITICAL_MEMORY_LOG_PATH);
return 0;
}
static int set_DeviceInfoMemoryStatusMemoryMonitor_FilePath(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
{
char *file_path = dmuci_get_option_value_fallback_def("sysmngr", "memory", "file_path", DEFAULT_CRITICAL_MEMORY_LOG_PATH);
switch (action) {
case VALUECHECK:
if (bbfdm_validate_string(ctx, value, -1, -1, NULL, NULL))
return FAULT_9007;
// Restriction: The path in `value` must either:
// - Start with "/var/log" for non-persistent logs, or
// - Start with "/log/" for persistent logs.
// Additionally, the path should not contain any '..' sequences
// to prevent directory traversal or invalid file paths.
if (!((strncmp(value, "/var/log", 8) == 0 || strncmp(value, "/log/", 5) == 0) && !strstr(value, ".."))) {
bbfdm_set_fault_message(ctx, "");
return FAULT_9007;
}
break;
case VALUESET:
if (file_exists(file_path)) {
struct uci_section *dmmap_sec = NULL;
char file_uri[512] = {0};
if (rename(file_path, value) != 0) {
bbfdm_set_fault_message(ctx, "Can't rename file from '%s' -> '%s'", file_path, value);
return FAULT_9007;
}
// Update VendorLogFile dmmap section
snprintf(file_uri, sizeof(file_uri), "file://%s", file_path);
dmmap_sec = get_dup_section_in_dmmap_opt("dmmap", "vendorlog", "log_file", file_uri);
snprintf(file_uri, sizeof(file_uri), "file://%s", value);
dmuci_set_value_by_section(dmmap_sec, "log_file", file_uri);
}
dmuci_set_value("sysmngr", "memory", "file_path", value);
break;
}
return 0;
}
static int get_memory_status_total(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
mem_info info = {0};
sysmngr_meminfo(&info);
dmasprintf(value, "%lu", info.mem_total);
return 0;
}
static int get_memory_status_free(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
mem_info info = {0};
sysmngr_meminfo(&info);
dmasprintf(value, "%lu", info.mem_free);
return 0;
}
static int get_memory_status_total_persistent(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
struct statvfs dinfo;
if (statvfs("/overlay/", &dinfo) == 0) {
unsigned int total = (dinfo.f_bsize * dinfo.f_blocks) / 1024;
dmasprintf(value, "%u", total);
} else {
*value = dmstrdup("0");
}
return 0;
}
static int get_memory_status_free_persistent(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
struct statvfs dinfo;
if (statvfs("/overlay/", &dinfo) == 0) {
unsigned int free = (dinfo.f_bsize * dinfo.f_bavail) / 1024;
dmasprintf(value, "%u", free);
} else {
*value = dmstrdup("0");
}
return 0;
}
/*************************************************************
* EVENTS
*************************************************************/
static event_args MemoryCriticalState_event_args = {
.name = "", // This field is left empty because we are not listening to any external events, The system now operates within a single unified daemon,
// removing the need for separate event listeners. See send_memory_critical_state_event API for details on implementation.
.param = (const char *[]) {
"MemUtilization",
NULL
}
};
static int get_event_MemoryCriticalState(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
{
*value = (char *)&MemoryCriticalState_event_args;
return 0;
}
/**********************************************************************************************************************************
* OBJ & LEAF DEFINITION
***********************************************************************************************************************************/
/* *** Device.DeviceInfo.MemoryStatus.MemoryMonitor. *** */
DMLEAF tDeviceInfoMemoryStatusMemoryMonitorParams[] = {
/* PARAM, permission, type, getvalue, setvalue, bbfdm_type */
{"Enable", &DMWRITE, DMT_BOOL, get_DeviceInfoMemoryStatusMemoryMonitor_Enable, set_DeviceInfoMemoryStatusMemoryMonitor_Enable, BBFDM_BOTH},
{"MemUtilization", &DMREAD, DMT_UNINT, get_DeviceInfoMemoryStatusMemoryMonitor_MemUtilization, NULL, BBFDM_BOTH},
{"PollingInterval", &DMWRITE, DMT_UNINT, get_DeviceInfoMemoryStatusMemoryMonitor_PollingInterval, set_DeviceInfoMemoryStatusMemoryMonitor_PollingInterval, BBFDM_BOTH},
{"CriticalRiseThreshold", &DMWRITE, DMT_UNINT, get_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseThreshold, set_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseThreshold, BBFDM_BOTH},
{"CriticalFallThreshold", &DMWRITE, DMT_UNINT, get_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallThreshold, set_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallThreshold, BBFDM_BOTH},
{"CriticalRiseTimeStamp", &DMREAD, DMT_TIME, get_DeviceInfoMemoryStatusMemoryMonitor_CriticalRiseTimeStamp, NULL, BBFDM_BOTH},
{"CriticalFallTimeStamp", &DMREAD, DMT_TIME, get_DeviceInfoMemoryStatusMemoryMonitor_CriticalFallTimeStamp, NULL, BBFDM_BOTH},
{"EnableCriticalLog", &DMWRITE, DMT_BOOL, get_DeviceInfoMemoryStatusMemoryMonitor_EnableCriticalLog, set_DeviceInfoMemoryStatusMemoryMonitor_EnableCriticalLog, BBFDM_BOTH},
{"VendorLogFileRef", &DMREAD, DMT_STRING, get_DeviceInfoMemoryStatusMemoryMonitor_VendorLogFileRef, NULL, BBFDM_BOTH},
{"FilePath", &DMWRITE, DMT_STRING, get_DeviceInfoMemoryStatusMemoryMonitor_FilePath, set_DeviceInfoMemoryStatusMemoryMonitor_FilePath, BBFDM_BOTH},
{"MemoryCriticalState!", &DMREAD, DMT_EVENT, get_event_MemoryCriticalState, NULL, BBFDM_USP},
{0}
};
/* *** Device.DeviceInfo.MemoryStatus. *** */
DMOBJ tDeviceInfoMemoryStatusObj[] = {
/* OBJ, permission, addobj, delobj, checkdep, browseinstobj, nextdynamicobj, dynamicleaf, nextobj, leaf, linker, bbfdm_type */
{"MemoryMonitor", &DMREAD, NULL, NULL, NULL, NULL, NULL, NULL, NULL, tDeviceInfoMemoryStatusMemoryMonitorParams, NULL, BBFDM_BOTH},
{0}
};
DMLEAF tDeviceInfoMemoryStatusParams[] = {
/* PARAM, permission, type, getvalue, setvalue, bbfdm_type, version*/
{"Total", &DMREAD, DMT_UNINT, get_memory_status_total, NULL, BBFDM_BOTH},
{"Free", &DMREAD, DMT_UNINT, get_memory_status_free, NULL, BBFDM_BOTH},
{"TotalPersistent", &DMREAD, DMT_UNINT, get_memory_status_total_persistent, NULL, BBFDM_BOTH},
{"FreePersistent", &DMREAD, DMT_UNINT, get_memory_status_free_persistent, NULL, BBFDM_BOTH},
{0}
};