static int nw_keys_ssh_start_acquire_data(struct nodewatcher_module *module,
struct ubus_context *ubus,
struct uci_context *uci)
{
json_object *object = json_object_new_object();
/* RSA key */
nw_keys_ssh_get_key(object, "/etc/dropbear/dropbear_rsa_host_key", "rsa");
/* DSS key */
nw_keys_ssh_get_key(object, "/etc/dropbear/dropbear_dss_host_key", "dss");
/* Store resulting JSON object */
return nw_module_finish_acquire_data(module, object);
}
static int nw_clients_start_acquire_data(struct nodewatcher_module *module,
struct ubus_context *ubus,
struct uci_context *uci)
{
json_object *object = json_object_new_object();
/* Iterate over DHCP leases */
FILE *leases_file = fopen("/tmp/dhcp.leases", "r");
if (leases_file) {
while (!feof(leases_file)) {
unsigned int expiry;
char mac[18];
char ip_address[46];
if (fscanf(leases_file, "%u %17s %45s %*[^\n]\n", &expiry, mac, ip_address) == 3) {
json_object *client = json_object_new_object();
json_object *addresses = json_object_new_array();
json_object *address = json_object_new_object();
json_object_object_add(address, "family", json_object_new_string("ipv4"));
json_object_object_add(address, "address", json_object_new_string(ip_address));
json_object_object_add(address, "expires", json_object_new_int(expiry));
json_object_array_add(addresses, address);
json_object_object_add(client, "addresses", addresses);
/* Compute salted hash of MAC address */
md5_ctx_t ctx;
uint8_t raw_mac_id[16];
char mac_id[33];
md5_begin(&ctx);
md5_hash(NW_CLIENT_ID_SALT, NW_CLIENT_ID_SALT_LENGTH, &ctx);
md5_hash(mac, 17, &ctx);
md5_end(raw_mac_id, &ctx);
/* Base64 encode the hash so it is more compact */
if (nw_base64_encode(raw_mac_id, sizeof(raw_mac_id), mac_id, sizeof(mac_id)) == 0) {
json_object_object_add(object, mac_id, client);
} else {
json_object_put(client);
}
}
}
fclose(leases_file);
}
/* Store resulting JSON object */
return nw_module_finish_acquire_data(module, object);
}
static int nw_resources_start_acquire_data(struct nodewatcher_module *module,
struct ubus_context *ubus,
struct uci_context *uci)
{
json_object *object = json_object_new_object();
/* Load average */
FILE *loadavg_file = fopen("/proc/loadavg", "r");
if (loadavg_file) {
char load1min[16], load5min[16], load15min[16];
if (fscanf(loadavg_file, "%15s %15s %15s", load1min, load5min, load15min) == 3) {
json_object *load_average = json_object_new_array();
json_object_array_add(load_average, json_object_new_string(load1min));
json_object_array_add(load_average, json_object_new_string(load5min));
json_object_array_add(load_average, json_object_new_string(load15min));
json_object_object_add(object, "load_average", load_average);
}
fclose(loadavg_file);
}
/* Memory usage counters */
FILE *memory_file = fopen("/proc/meminfo", "r");
if (memory_file) {
json_object *memory = json_object_new_object();
while (!feof(memory_file)) {
char key[128];
int value;
if (fscanf(memory_file, "%127[^:]%*c%d kB", key, &value) == 2) {
if (strcmp(nw_string_trim(key), "MemTotal") == 0) {
json_object_object_add(memory, "total", json_object_new_int(value));
} else if (strcmp(nw_string_trim(key), "MemFree") == 0) {
json_object_object_add(memory, "free", json_object_new_int(value));
} else if (strcmp(nw_string_trim(key), "Buffers") == 0) {
json_object_object_add(memory, "buffers", json_object_new_int(value));
} else if (strcmp(nw_string_trim(key), "Cached") == 0) {
json_object_object_add(memory, "cache", json_object_new_int(value));
/* We can break as we don't need entries after "cache" */
break;
}
}
}
fclose(memory_file);
json_object_object_add(object, "memory", memory);
}
/* Number of local TCP/UDP connections */
json_object *connections = json_object_new_object();
json_object *connections_ipv4 = json_object_new_object();
json_object_object_add(connections_ipv4, "tcp", json_object_new_int(nw_file_line_count("/proc/net/tcp") - 1));
json_object_object_add(connections_ipv4, "udp", json_object_new_int(nw_file_line_count("/proc/net/udp") - 1));
json_object_object_add(connections, "ipv4", connections_ipv4);
json_object *connections_ipv6 = json_object_new_object();
json_object_object_add(connections_ipv6, "tcp", json_object_new_int(nw_file_line_count("/proc/net/tcp6") - 1));
json_object_object_add(connections_ipv6, "udp", json_object_new_int(nw_file_line_count("/proc/net/udp6") - 1));
json_object_object_add(connections, "ipv6", connections_ipv6);
/* Number of entries in connection tracking table */
json_object *connections_tracking = json_object_new_object();
nw_json_from_file("/proc/sys/net/netfilter/nf_conntrack_count", connections_tracking, "count", true);
nw_json_from_file("/proc/sys/net/netfilter/nf_conntrack_max", connections_tracking, "max", true);
json_object_object_add(connections, "tracking", connections_tracking);
json_object_object_add(object, "connections", connections);
/* Number of processes by status */
DIR *proc_dir;
struct dirent *proc_entry;
char path[PATH_MAX];
if ((proc_dir = opendir("/proc")) != NULL) {
json_object *processes = json_object_new_object();
int proc_by_state[6] = {0, };
while ((proc_entry = readdir(proc_dir)) != NULL) {
snprintf(path, sizeof(path) - 1, "/proc/%s/stat", proc_entry->d_name);
FILE *proc_file = fopen(path, "r");
if (proc_file) {
char state;
if (fscanf(proc_file, "%*d (%*[^)]) %c", &state) == 1) {
switch (state) {
case 'R': proc_by_state[0]++; break;
case 'S': proc_by_state[1]++; break;
case 'D': proc_by_state[2]++; break;
case 'Z': proc_by_state[3]++; break;
case 'T': proc_by_state[4]++; break;
case 'W': proc_by_state[5]++; break;
}
}
fclose(proc_file);
}
}
closedir(proc_dir);
json_object_object_add(processes, "running", json_object_new_int(proc_by_state[0]));
json_object_object_add(processes, "sleeping", json_object_new_int(proc_by_state[1]));
json_object_object_add(processes, "blocked", json_object_new_int(proc_by_state[2]));
json_object_object_add(processes, "zombie", json_object_new_int(proc_by_state[3]));
json_object_object_add(processes, "stopped", json_object_new_int(proc_by_state[4]));
json_object_object_add(processes, "paging", json_object_new_int(proc_by_state[5]));
json_object_object_add(object, "processes", processes);
}
/* CPU usage by category */
FILE *cpu_file = fopen("/proc/stat", "r");
if (cpu_file) {
unsigned int cpu_times[7] = {0, };
if (fscanf(cpu_file, "cpu %u %u %u %u %u %u %u",
&cpu_times[0], &cpu_times[1], &cpu_times[2], &cpu_times[3],
&cpu_times[4], &cpu_times[5], &cpu_times[6]) == 7) {
unsigned long sum = 0;
for (int i = 0; i < 7; i++) {
int tmp = cpu_times[i];
cpu_times[i] -= last_cpu_times[i];
last_cpu_times[i] = tmp;
sum += cpu_times[i];
}
/* Compute CPU usage percentages since the last run interval */
for (int i = 0; i < 7; i++)
cpu_times[i] = (unsigned int) (round((double) cpu_times[i] * 100 / sum));
json_object *cpu = json_object_new_object();
json_object_object_add(cpu, "user", json_object_new_int(cpu_times[0]));
json_object_object_add(cpu, "system", json_object_new_int(cpu_times[1]));
json_object_object_add(cpu, "nice", json_object_new_int(cpu_times[2]));
json_object_object_add(cpu, "idle", json_object_new_int(cpu_times[3]));
json_object_object_add(cpu, "iowait", json_object_new_int(cpu_times[4]));
json_object_object_add(cpu, "irq", json_object_new_int(cpu_times[5]));
json_object_object_add(cpu, "softirq", json_object_new_int(cpu_times[6]));
json_object_object_add(object, "cpu", cpu);
}
fclose(cpu_file);
}
/* Number of IPv4 routes */
/* Number of IPv6 routes */
/* Number of open file descriptors */
FILE *filenr_file = fopen("/proc/sys/fs/file-nr", "r");
if (filenr_file) {
unsigned int fn_current = 0, fn_available = 0, fn_max = 0;
if (fscanf(filenr_file, "%u\t%u\t%u", &fn_current, &fn_available, &fn_max) == 3) {
json_object *files = json_object_new_object();
json_object_object_add(files, "open", json_object_new_int(fn_current));
json_object_object_add(files, "available", json_object_new_int(fn_available));
json_object_object_add(files, "max", json_object_new_int(fn_max));
json_object_object_add(object, "files", files);
}
fclose(filenr_file);
}
/* Store resulting JSON object */
nw_module_finish_acquire_data(module, object);
return 0;
}