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DAWN/src/utils/dawn_uci.c
Chen Minqiang ba56bac909 network: ping pong keepalive for tcp connections 
To make the tcp connections keepalive and better handle the timeout
of connections

con_timeout indicate the connection timeout and it is configurable

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
2022-07-21 17:43:44 +08:00

594 lines
22 KiB
C
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#include <ctype.h>
#include <uci.h>
#include <stdlib.h>
#include <string.h>
#include "memory_utils.h"
#include "datastorage.h"
#include "dawn_iwinfo.h"
#include "dawn_uci.h"
static struct uci_context *uci_ctx = NULL;
static struct uci_package *uci_pkg = NULL;
static void set_if_present_int(int *ret, struct uci_section *s, const char* option) {
const char *str;
if (s && (str = uci_lookup_option_string(uci_ctx, s, option)))
*ret = atoi(str);
}
#define DAWN_SET_CONFIG_INT(m, s, conf) \
set_if_present_int(&m.conf, s, #conf)
void uci_get_hostname(char* hostname)
{
dawnlog_debug_func("Entering...");
char path[]= "system.@system[0].hostname";
struct uci_ptr ptr;
struct uci_context *c = uci_alloc_context();
dawn_regmem(c);
if(!c){
return;
}
if ((uci_lookup_ptr(c, &ptr, path, true) != UCI_OK) || (ptr.o==NULL || ptr.o->v.string==NULL)){
uci_free_context(c);
dawn_unregmem(c);
return;
}
if(ptr.flags & UCI_LOOKUP_COMPLETE)
{
char *dot = strchr(ptr.o->v.string, '.');
size_t len = HOST_NAME_MAX - 1;
if (dot && dot < ptr.o->v.string + len)
{
len = dot - ptr.o->v.string;
}
snprintf(hostname, HOST_NAME_MAX, "%.*s", (int)len, ptr.o->v.string);
}
uci_free_context(c);
dawn_unregmem(c);
}
static void set_if_present_time_t(time_t *ret, struct uci_section *s, const char* option) {
const char *str;
if (s && (str = uci_lookup_option_string(uci_ctx, s, option)))
*ret = atoi(str);
}
#define DAWN_SET_CONFIG_TIME(m, s, conf) \
set_if_present_time_t(&m.conf, s, #conf)
struct time_config_s uci_get_time_config() {
struct time_config_s ret = {
.update_client = 10,
.remove_client = 15,
.remove_probe = 30,
.update_hostapd = 10,
.remove_ap = 460,
.update_tcp_con = 10,
.update_chan_util = 5,
.update_beacon_reports = 20,
.con_timeout = 60,
};
dawnlog_debug_func("Entering...");
struct uci_element *e;
uci_foreach_element(&uci_pkg->sections, e)
{
struct uci_section *s = uci_to_section(e);
if (strcmp(s->type, "times") == 0) {
//CONFIG-T: update_client|Timer to send refresh local connection information and revised NEIGHBOR REPORT to all clients|[10]
DAWN_SET_CONFIG_TIME(ret, s, update_client);
//CONFIG-T: remove_client|Timer to remove expired client entries from core data set|[15]
DAWN_SET_CONFIG_TIME(ret, s, remove_client);
//CONFIG-T: remove_probe|Timer to remove expired PROBE and BEACON entries from core data set|[30]
DAWN_SET_CONFIG_TIME(ret, s, remove_probe);
//CONFIG-T: update_hostapd|Timer to (re-)register for hostapd messages for each local BSSID|[10]
DAWN_SET_CONFIG_TIME(ret, s, update_hostapd);
//CONFIG-T: remove_ap|Timer to remove expired AP entries from core data set|[460]
DAWN_SET_CONFIG_TIME(ret, s, remove_ap);
//CONFIG-T: update_tcp_con|Timer to refresh / remove the TCP connections to other DAWN instances found via uMDNS|[10]
DAWN_SET_CONFIG_TIME(ret, s, update_tcp_con);
//CONFIG-T: update_chan_util|Timer to get recent channel utilisation figure for each local BSSID|[5]
DAWN_SET_CONFIG_TIME(ret, s, update_chan_util);
//CONFIG-T: update_beacon_reports|Timer to ask all connected clients for a new BEACON REPORT|[20]
DAWN_SET_CONFIG_TIME(ret, s, update_beacon_reports);
//CONFIG-T: con_timeout|Timespan to check if a connection timed out|[60]
DAWN_SET_CONFIG_TIME(ret, s, con_timeout);
return ret;
}
}
return ret;
}
struct local_config_s uci_get_local_config() {
struct local_config_s ret = {
.loglevel = 0,
};
dawnlog_debug_func("Entering...");
struct uci_element* e;
uci_foreach_element(&uci_pkg->sections, e)
{
struct uci_section* s = uci_to_section(e);
if (strcmp(s->type, "local") == 0) {
// CONFIG-L: loglevel|Verbosity of messages in syslog|[0 = Important only - very few messages]; 1 = Show what DAWN is processing in a user friendly way; 2 = Trace certain operations - for debugging; 3 = Broad low level tracing - for debugging
DAWN_SET_CONFIG_INT(ret, s, loglevel);
}
}
switch (ret.loglevel)
{
case 3:
dawnlog_minlevel(DAWNLOG_DEBUG);
break;
case 2:
dawnlog_minlevel(DAWNLOG_TRACE);
break;
case 1:
dawnlog_minlevel(DAWNLOG_INFO);
break;
case 0:
default:
dawnlog_minlevel(DAWNLOG_ALWAYS);
break;
}
return ret;
}
static struct mac_entry_s *insert_neighbor_mac(struct mac_entry_s *head, const char* mac) {
dawnlog_debug_func("Entering...");
struct mac_entry_s *new = dawn_malloc(sizeof(struct mac_entry_s));
if (new == NULL) {
dawnlog_error("Failed to allocate neighbor entry for '%s'\n", mac);
return head;
}
memset(new, 0, sizeof (struct mac_entry_s));
if (hwaddr_aton(mac, new->mac.u8) != 0) {
dawnlog_error("Failed to parse MAC from '%s'\n", mac);
dawn_free(new);
new = NULL;
return head;
}
new->next_mac = head;
return new;
}
static void free_neighbor_mac_list(struct mac_entry_s *list) {
struct mac_entry_s *ptr = list;
dawnlog_debug_func("Entering...");
while (list) {
ptr = list;
list = list->next_mac;
dawn_free(ptr);
ptr = NULL;
}
}
static struct mac_entry_s* uci_lookup_mac_list(struct uci_option *o) {
struct uci_element *e = NULL;
struct mac_entry_s *head = NULL;
char* str = NULL;
dawnlog_debug_func("Entering...");
if (o == NULL)
return NULL;
// hostapd inserts the new neigbor reports at the top of the list.
// Therefore, we must also do this backwares somewhere. Let's do it
// here instead of when sending the list through ubus.
switch (o->type) {
case UCI_TYPE_LIST:
uci_foreach_element(&o->v.list, e)
head = insert_neighbor_mac(head, e->name);
break;
case UCI_TYPE_STRING:
if (!(str = strdup (o->v.string)))
return NULL;
for (char *mac = strtok(str, " "); mac; mac = strtok(NULL, " "))
head = insert_neighbor_mac(head, mac);
free(str);
}
return head;
}
static struct uci_section *uci_find_metric_section(const char *name) {
struct uci_section *s;
struct uci_element *e;
dawnlog_debug_func("Entering...");
uci_foreach_element(&uci_pkg->sections, e) {
s = uci_to_section(e);
if (strcmp(s->type, "metric") == 0 &&
((!name && s->anonymous) || strcmp(e->name, name) == 0)) {
return s;
}
}
return NULL;
}
#define DAWN_SET_BANDS_CONFIG_INT(m, global_s, band_s, conf) \
do for (int band = 0; band < __DAWN_BAND_MAX; band++) { \
if (global_s) \
set_if_present_int(&m.conf[band], global_s, #conf); \
if (band_s[band]) \
set_if_present_int(&m.conf[band], band_s[band], #conf); \
} while (0)
struct probe_metric_s uci_get_dawn_metric() {
struct probe_metric_s ret = {
// CONFIG-G: kicking|Method to select clients to move to better AP|0 = Disabled; 1 = RSSI Comparison; 2 = Absolute RSSI; [3 = Both] See note 1.
.kicking = 3,
//CONFIG-G: kicking_threshold|Minimum score difference to consider kicking to alternate AP|[20]
.kicking_threshold = 20,
// CONFIG-G: min_probe_count|Number of times a client should retry PROBE before acceptance| [3] See Note 1.
.min_probe_count = 3,
// CONFIG-G: use_station_count|Compare connected station counts when considering kicking|[0 = Disabled]; 1 = Enabled
.use_station_count = 0,
// CONFIG-G: eval_auth_req|Control whether AUTHENTICATION frames are evaluated for rejection|[0 = No evaluation]; 1 = Evaluated. See Note 1.
.eval_auth_req = 0,
// CONFIG-G: eval_assoc_req|Control whether ASSOCIATION frames are evaluated for rejection|[0 = No evaluation]; 1 = Evaluated. See Note 1.
.eval_assoc_req = 0,
// CONFIG-G: deny_auth_reason|802.11 code used when AUTHENTICATION is denied|[1] (802.11 UNSPECIFIED_FAILURE). See Note 1.
.deny_auth_reason = 1,
// CONFIG-G: deny_assoc_reason|802.11 code used when ASSOCIATION is denied|[17] (802.11 AP_UNABLE_TO_HANDLE_NEW_STA). See Note 1.
.deny_assoc_reason = 17,
// CONFIG-G: eval_probe_req|Control whether PROBE frames are evaluated for rejection|[0 = No evaluation]; 1 = Evaluated. See Note 1.
.eval_probe_req = 0,
// CONFIG-G: min_number_to_kick|Number of consecutive times a client should be evaluated as ready to kick before actually doing it|[3]
.min_number_to_kick = 3,
// CONFIG-G: set_hostapd_nr|Method used to set Neighbor Report on AP|[0 = Disabled]; 1 = "Static" based on all APs in network (plus set from configuration); 2 = "Dynamic" based on next nearest AP seen by current clients
.set_hostapd_nr = 0,
// CONFIG-G: disassoc_nr_length|Number of entries to include in a 802.11v DISASSOCIATE Neighbor Report|[6] (Documented for use by iOS)
.disassoc_nr_length = 6,
// CONFIG-G: max_station_diff|Number of connected stations to consider "better" for use_station_count|[1]
.max_station_diff = 1,
// CONFIG-G: bandwidth_threshold|Maximum reported AP-client bandwidth permitted when kicking. Set to zero to disable the check.|[6] (Mbits/s)
.bandwidth_threshold = 6,
// CONFIG-G: chan_util_avg_period|Number of sampling periods to average channel utilization values over|[3]
.chan_util_avg_period = 3,
// CONFIG-G: duration|802.11k BEACON request DURATION parameter|[0]
.duration = 150,
// CONFIG-G: rrm_mode|Preferred order for using Passive, Active or Table 802.11k BEACON information|[PAT] String of 'P', 'A' and / or 'T'
.rrm_mode_mask = WLAN_RRM_CAPS_BEACON_REPORT_PASSIVE |
WLAN_RRM_CAPS_BEACON_REPORT_ACTIVE |
WLAN_RRM_CAPS_BEACON_REPORT_TABLE,
.rrm_mode_order = { WLAN_RRM_CAPS_BEACON_REPORT_PASSIVE,
WLAN_RRM_CAPS_BEACON_REPORT_ACTIVE,
WLAN_RRM_CAPS_BEACON_REPORT_TABLE },
// CONFIG-B: ap_weight|Per AP weighting|[0] (Deprecated)
.ap_weight = { 0, 0 },
// CONFIG-B: ht_support|Score increment if HT is supported|[5]
.ht_support = { 5, 5 },
// CONFIG-B: vht_support|Score increment if VHT is supported|[5]
.vht_support = { 5, 5 },
// CONFIG-B: no_ht_support|Score incrment if HT is not supported|[0] (Deprecated)
.no_ht_support = { 0, 0 },
// CONFIG-B: no_vht_support|Score incrment if VHT is not supported|[0] (Deprecated)
.no_vht_support = { 0, 0 },
// CONFIG-B: rssi|Score addition when signal exceeds threshold|[15] See note 2.
.rssi = { 15, 15 },
// CONFIG-B: rssi_val|Threshold for an good RSSI|[-60] See note 2.
.rssi_val = { -60, -60 },
// CONFIG-B: initial_score|Base score for AP based on operating band|[2.4GHz = 80; 5Ghz = 100]
.initial_score = { 80, 100 },
// CONFIG-B: chan_util|Score increment if channel utilization is below chan_util_val|[0]
.chan_util = { 0, 0 },
// CONFIG-B: max_chan_util_val|Lower threshold for bad channel utilization|[170]
.max_chan_util_val = { 170, 170 },
// CONFIG-B: chan_util_val|Upper threshold for good channel utilization|[140]
.chan_util_val = { 140, 140 },
// CONFIG-B: max_chan_util|Score increment if channel utilization is above max_chan_util_val|[-15]
.max_chan_util = { -15, -15 },
// CONFIG-B: low_rssi|Score addition when signal is below threshold|[-15] See note 2.
.low_rssi = { -15, -15 },
// CONFIG-B: low_rssi_val|Threshold for bad RSSI|[-80] See note 2.
.low_rssi_val = { -80, -80 },
// CONFIG-B: rssi_center|Midpoint for weighted RSSI evaluation|[-70] See note 2.
.rssi_center = { -70, -70 },
// CONFIG-B: rssi_weight|Per dB increment for weighted RSSI evaluation|[0] See note 2.
.rssi_weight = { 0, 0 },
.neighbors = {NULL, NULL},
};
struct uci_section *global_s, *band_s[__DAWN_BAND_MAX];
struct uci_option *global_neighbors = NULL, *neighbors;
dawnlog_debug_func("Entering...");
global_s = uci_find_metric_section("global");
if (!global_s && (global_s = uci_find_metric_section(NULL)))
dawnlog_warning("config metric global section not found. "
"Using first unnamed config metric.\n"
"Consider naming a 'global' metric section to avoid ambiguity.\n");
if (!global_s)
dawnlog_warning("config metric global section not found! Using defaults.\n");
if (global_s) {
// True global configuration
DAWN_SET_CONFIG_INT(ret, global_s, kicking);
DAWN_SET_CONFIG_INT(ret, global_s, kicking_threshold);
DAWN_SET_CONFIG_INT(ret, global_s, min_probe_count);
DAWN_SET_CONFIG_INT(ret, global_s, use_station_count);
DAWN_SET_CONFIG_INT(ret, global_s, eval_auth_req);
DAWN_SET_CONFIG_INT(ret, global_s, eval_assoc_req);
DAWN_SET_CONFIG_INT(ret, global_s, deny_auth_reason);
DAWN_SET_CONFIG_INT(ret, global_s, deny_assoc_reason);
DAWN_SET_CONFIG_INT(ret, global_s, eval_probe_req);
DAWN_SET_CONFIG_INT(ret, global_s, min_number_to_kick);
DAWN_SET_CONFIG_INT(ret, global_s, set_hostapd_nr);
DAWN_SET_CONFIG_INT(ret, global_s, disassoc_nr_length);
DAWN_SET_CONFIG_INT(ret, global_s, max_station_diff);
DAWN_SET_CONFIG_INT(ret, global_s, bandwidth_threshold);
DAWN_SET_CONFIG_INT(ret, global_s, chan_util_avg_period);
DAWN_SET_CONFIG_INT(ret, global_s, duration);
ret.rrm_mode_mask = parse_rrm_mode(ret.rrm_mode_order,
uci_lookup_option_string(uci_ctx, global_s, "rrm_mode"));
global_neighbors = uci_lookup_option(uci_ctx, global_s, "neighbors");
}
for (int band = 0; band < __DAWN_BAND_MAX; band++) {
band_s[band] = uci_find_metric_section(band_config_name[band]);
neighbors = band_s[band] ? uci_lookup_option(uci_ctx, band_s[band], "neighbors") : NULL;
ret.neighbors[band] = uci_lookup_mac_list(neighbors ? : global_neighbors);
}
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, initial_score);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, ap_weight);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, ht_support);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, vht_support);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, no_ht_support);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, no_vht_support);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, rssi);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, rssi_val);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, chan_util);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, max_chan_util);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, chan_util_val);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, max_chan_util_val);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, low_rssi);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, low_rssi_val);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, rssi_weight);
DAWN_SET_BANDS_CONFIG_INT(ret, global_s, band_s, rssi_center);
return ret;
}
struct network_config_s uci_get_dawn_network() {
struct network_config_s ret = {
.broadcast_ip = "",
.broadcast_port = 1025,
.server_ip = "",
.tcp_port = 1026,
.network_option = 2,
.shared_key = "Niiiiiiiiiiiiiik",
.iv = "Niiiiiiiiiiiiiik",
.use_symm_enc = 0,
.collision_domain = -1,
.bandwidth = -1,
};
dawnlog_debug_func("Entering...");
struct uci_element *e;
uci_foreach_element(&uci_pkg->sections, e)
{
struct uci_section *s = uci_to_section(e);
if (strcmp(s->type, "network") == 0) {
// CONFIG-N: broadcast_ip|IP address for broadcast and multicast|No default
const char* str_broadcast = uci_lookup_option_string(uci_ctx, s, "broadcast_ip");
if (str_broadcast)
strncpy(ret.broadcast_ip, str_broadcast, MAX_IP_LENGTH);
// CONFIG-N: server_ip|IP address when not using UMDNS|No default
const char* str_server_ip = uci_lookup_option_string(uci_ctx, s, "server_ip");
if(str_server_ip)
strncpy(ret.server_ip, str_server_ip, MAX_IP_LENGTH);
// CONFIG-N: broadcast_port|IP port for broadcast and multicast|[1026]
DAWN_SET_CONFIG_INT(ret, s, broadcast_port);
// CONFIG-N: shared_key|Unused|N/A
const char* str_shared_key = uci_lookup_option_string(uci_ctx, s, "shared_key");
if (str_shared_key)
strncpy(ret.shared_key, str_shared_key, MAX_KEY_LENGTH);
// CONFIG-N: iv|Unused|N/A
const char* str_iv = uci_lookup_option_string(uci_ctx, s, "iv");
if (str_iv)
strncpy(ret.iv, str_iv, MAX_KEY_LENGTH);
// CONFIG-N: network_option|Method of networking between DAWN instances|0 = Broadcast; 2 = Multicast; [2 = TCP with UMDNS discovery]; 3 = TCP w/out UMDNS discovery
DAWN_SET_CONFIG_INT(ret, s, network_option);
// CONFIG-N: tcp_port|Port for TCP networking|[1025]
DAWN_SET_CONFIG_INT(ret, s, tcp_port);
// CONFIG-N: use_symm_enc|Enable encryption of network traffic|[0 = Disabled]; 1 = Enabled
DAWN_SET_CONFIG_INT(ret, s, use_symm_enc);
// CONFIG-N: collision_domain|Unused|N/A
DAWN_SET_CONFIG_INT(ret, s, collision_domain);
// CONFIG-N: bandwidth|Unused|N/A
DAWN_SET_CONFIG_INT(ret, s, bandwidth);
return ret;
}
}
return ret;
}
bool uci_get_dawn_hostapd_dir() {
dawnlog_debug_func("Entering...");
struct uci_element *e;
uci_foreach_element(&uci_pkg->sections, e)
{
struct uci_section *s = uci_to_section(e);
if (strcmp(s->type, "hostapd") == 0) {
// CONFIG-H: hostapd_dir|Path to hostapd runtime information|[/var/run/hostapd]
const char* str = uci_lookup_option_string(uci_ctx, s, "hostapd_dir");
if (str)
strncpy(hostapd_dir_glob, str, HOSTAPD_DIR_LEN);
return true;
}
}
// If we get to here we haven't set a value yet
strncpy(hostapd_dir_glob, "/var/run/hostapd", HOSTAPD_DIR_LEN);
return false;
}
int uci_reset()
{
dawnlog_debug_func("Entering...");
struct uci_context *ctx = uci_ctx;
if (!ctx) {
ctx = uci_alloc_context();
dawn_regmem(ctx);
uci_ctx = ctx;
}
uci_pkg = uci_lookup_package(ctx, "dawn");
uci_unload(uci_ctx, uci_pkg);
dawn_unregmem(uci_pkg);
uci_load(uci_ctx, "dawn", &uci_pkg);
dawn_regmem(uci_pkg);
return 0;
}
int uci_init() {
dawnlog_debug_func("Entering...");
struct uci_context *ctx = uci_ctx;
if (!ctx) {
ctx = uci_alloc_context();
dawn_regmem(ctx);
uci_ctx = ctx;
ctx->flags &= ~UCI_FLAG_STRICT;
} else {
ctx->flags &= ~UCI_FLAG_STRICT;
// shouldn't happen?
uci_pkg = uci_lookup_package(ctx, "dawn");
if (uci_pkg)
{
uci_unload(ctx, uci_pkg);
dawn_unregmem(uci_pkg);
uci_pkg = NULL;
}
}
if (uci_load(ctx, "dawn", &uci_pkg))
return -1;
else
dawn_regmem(uci_pkg);
return 1;
}
int uci_clear() {
dawnlog_debug_func("Entering...");
// CONFIG-G: neighbors|Space seperated list of MACS to use in "static" AP Neighbor Report| None
for (int band = 0; band < __DAWN_BAND_MAX; band++)
free_neighbor_mac_list(dawn_metric.neighbors[band]);
if (uci_pkg != NULL) {
uci_unload(uci_ctx, uci_pkg);
dawn_unregmem(uci_pkg);
uci_pkg = NULL;
}
if (uci_ctx != NULL) {
uci_free_context(uci_ctx);
dawn_unregmem(uci_ctx);
}
return 1;
}
int uci_set_network(char* uci_cmd)
{
dawnlog_debug_func("UCI command = \"%s\"...", uci_cmd);
struct uci_context *ctx = uci_ctx;
if (!ctx) {
ctx = uci_alloc_context();
dawn_regmem(ctx);
uci_ctx = ctx;
}
ctx->flags |= UCI_FLAG_STRICT;
int ret = UCI_OK;
struct uci_ptr ptr;
if (ret == UCI_OK)
{
ret = uci_lookup_ptr(ctx, &ptr, uci_cmd, 1);
}
if (ret == UCI_OK)
{
// Magic code to add unnamed section like 'config times' exactly once - no idea if this is quite right
if (ptr.target == UCI_TYPE_SECTION && ptr.value == NULL)
{
char new_cmd[1024]; // Magic number
sprintf(new_cmd, "%s.@%s[0]", ptr.package, ptr.section);
struct uci_ptr ptr2;
ret = uci_lookup_ptr(ctx, &ptr2, new_cmd, 1);
if (ret == UCI_OK && ptr2.s == NULL)
{
ret = uci_add_section(ctx, ptr.p, ptr.section, &ptr.s);
}
}
else
{
ret = uci_set(ctx, &ptr);
}
}
if (ret == UCI_OK)
{
ret = uci_lookup_ptr(ctx, &ptr, "dawn", 1);
}
if (ret == UCI_OK)
{
ret = uci_commit(ctx, &ptr.p, 0);
}
if (ret != UCI_OK) {
dawnlog_error("Failed to commit UCI cmd: %s\n", uci_cmd);
}
return ret;
}
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