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network: Refactor network_info usage

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For simplicity and future use (possibly performance), every struct network
gets a pointer to a network_info structure, there's one network_info for
every network being by any interface, not only known networks.  The SSID
and security type information is removed from struct network because the
network_info holds that information.

network_info also gets a seen_count field to count how many references
from network.info fields it has, so as to fix the removal of
network_info structures.  Previously, once they were added to the
networks list, they'd stay there forever possibly skewing the network
ranking results.

This also fixed the network ranking used by GetOrderedNetwork which
wasn't working due to a missing assignment of *index in
network_find_info also triggering valgrind alerts.
This commit is contained in:
Andrew Zaborowski 2016-06-17 00:54:13 +02:00 committed by Denis Kenzior
parent 1c4767d834
commit 9daf1f3fcf
2 changed files with 116 additions and 105 deletions
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206
src/network.c
View File

@ -43,20 +43,12 @@
#include "src/wiphy.h"
#include "src/network.h"
struct network_info {
char ssid[33];
uint32_t type;
struct timespec connected_time; /* Time last connected */
struct timespec seen_time; /* Time last seen */
};
struct network {
char *object_path;
struct device *device;
char ssid[33];
struct network_info *info;
unsigned char *psk;
unsigned int agent_request;
enum security security;
struct l_queue *bss_list;
struct l_settings *settings;
bool update_psk:1; /* Whether PSK should be written to storage */
@ -104,44 +96,13 @@ static bool network_info_match(const void *a, const void *b)
bool network_seen(struct network *network, struct timespec *when)
{
struct timespec mtim;
int err;
struct network_info *info;
struct network_info search;
const char *strtype;
search.type = network->security;
strncpy(search.ssid, network->ssid, 32);
search.ssid[32] = 0;
info = l_queue_find(networks, network_info_match, &search);
if (info)
goto update;
strtype = security_to_str(network->security);
if (!strtype)
return false;
err = storage_network_get_mtime(strtype, network->ssid, &mtim);
if (err < 0)
return false;
info = l_new(struct network_info, 1);
info->type = network->security;
strncpy(info->ssid, network->ssid, 32);
info->ssid[32] = 0;
memcpy(&info->connected_time, &mtim, sizeof(struct timespec));
l_queue_insert(networks, info, timespec_compare, NULL);
update:
/*
* Update the last seen time. Note this is not preserved across
* the network going out of range and back, or program restarts.
* It may be desirable for it to be preserved in some way but
* without too frequent filesystem writes.
*/
memcpy(&info->seen_time, when, sizeof(struct timespec));
memcpy(&network->info->seen_time, when, sizeof(struct timespec));
return true;
}
@ -149,23 +110,16 @@ update:
bool network_connected(struct network *network)
{
int err;
struct network_info *info;
struct network_info search;
const char *strtype;
search.type = network->security;
strncpy(search.ssid, network->ssid, 32);
search.ssid[32] = 0;
l_queue_remove(networks, network->info);
l_queue_push_head(networks, network->info);
info = l_queue_remove_if(networks, network_info_match, &search);
if (!info)
strtype = security_to_str(network_get_security(network));
if (!strtype)
return false;
strtype = security_to_str(network->security);
if (!strtype)
goto fail;
err = storage_network_touch(strtype, network->ssid);
err = storage_network_touch(strtype, network->info->ssid);
if (err == -ENOENT) {
/*
* Write an empty settings file to keep track of the
@ -175,23 +129,19 @@ bool network_connected(struct network *network)
* only on a successful connect.
*/
if (!network_settings_load(network))
goto fail;
return false;
storage_network_sync(strtype, network->ssid, network->settings);
storage_network_sync(strtype, network->info->ssid,
network->settings);
} else
goto fail;
return false;
err = storage_network_get_mtime(strtype, network->ssid,
&info->connected_time);
err = storage_network_get_mtime(strtype, network->info->ssid,
&network->info->connected_time);
if (err < 0)
goto fail;
return false;
l_queue_push_head(networks, info);
return true;
fail:
l_free(info);
return false;
}
void network_disconnected(struct network *network)
@ -199,27 +149,23 @@ void network_disconnected(struct network *network)
network_settings_close(network);
}
static const struct network_info *network_find_info(const char *ssid,
enum security security,
unsigned int *index)
static int network_find_rank_index(const struct network_info *info)
{
const struct l_queue_entry *entry;
int n;
for (n = 0, entry = l_queue_get_entries(networks); entry;
entry = entry->next, n += 1) {
const struct network_info *info = entry->data;
entry = entry->next) {
struct network_info *network = entry->data;
if (info->type != security)
continue;
if (network == info)
return n;
if (strcmp(info->ssid, ssid))
continue;
return info;
if (network->seen_count)
n++;
}
return NULL;
return -1;
}
/* First 64 entries calculated by 1 / pow(n, 0.3) for n >= 1 */
@ -244,12 +190,10 @@ static const double rankmod_table[] = {
bool network_rankmod(const struct network *network, double *rankmod)
{
unsigned int n;
unsigned int nmax;
const struct network_info *info = network_find_info(
network->ssid, network->security, &n);
int n = network_find_rank_index(network->info);
int nmax;
if (!info)
if (n == -1)
return false;
nmax = L_ARRAY_SIZE(rankmod_table);
@ -262,6 +206,48 @@ bool network_rankmod(const struct network *network, double *rankmod)
return true;
}
static void network_info_free(void *data)
{
struct network_info *network = data;
l_free(network);
}
static struct network_info *network_info_get(const char *ssid,
enum security security)
{
struct network_info *network, search;
search.type = security;
strcpy(search.ssid, ssid);
network = l_queue_find(networks, network_info_match, &search);
if (!network) {
network = l_new(struct network_info, 1);
strcpy(network->ssid, ssid);
network->type = security;
l_queue_push_tail(networks, network);
}
network->seen_count++;
return network;
}
static void network_info_put(struct network_info *network)
{
if (!networks)
return;
if (--network->seen_count)
return;
l_queue_remove(networks, network);
network_info_free(network);
}
struct network *network_create(struct device *device,
uint8_t *ssid, uint8_t ssid_len,
enum security security)
@ -270,8 +256,7 @@ struct network *network_create(struct device *device,
network = l_new(struct network, 1);
network->device = device;
memcpy(network->ssid, ssid, ssid_len);
network->security = security;
network->info = network_info_get((char *) ssid, security);
network->bss_list = l_queue_new();
@ -280,7 +265,7 @@ struct network *network_create(struct device *device,
const char *network_get_ssid(const struct network *network)
{
return network->ssid;
return network->info->ssid;
}
struct device *network_get_device(const struct network *network)
@ -295,7 +280,7 @@ const char *network_get_path(const struct network *network)
enum security network_get_security(const struct network *network)
{
return network->security;
return network->info->type;
}
const unsigned char *network_get_psk(const struct network *network)
@ -322,11 +307,11 @@ bool network_settings_load(struct network *network)
if (network->settings)
return true;
strtype = security_to_str(network->security);
strtype = security_to_str(network_get_security(network));
if (!strtype)
return false;
network->settings = storage_network_open(strtype, network->ssid);
network->settings = storage_network_open(strtype, network->info->ssid);
return network->settings != NULL;
}
@ -343,7 +328,7 @@ void network_sync_psk(struct network *network)
l_settings_set_value(network->settings, "Security",
"PreSharedKey", hex);
l_free(hex);
storage_network_sync("psk", network->ssid, network->settings);
storage_network_sync("psk", network->info->ssid, network->settings);
}
void network_settings_close(struct network *network)
@ -415,7 +400,7 @@ void network_connect_failed(struct network *network)
* Connection failed, if PSK try asking for the passphrase
* once more
*/
if (network->security == SECURITY_PSK) {
if (network_get_security(network) == SECURITY_PSK) {
network->update_psk = false;
network->ask_psk = true;
}
@ -444,7 +429,7 @@ static struct scan_bss *network_select_bss(struct wiphy *wiphy,
struct l_queue *bss_list = network->bss_list;
const struct l_queue_entry *bss_entry;
switch (network->security) {
switch (network_get_security(network)) {
case SECURITY_NONE:
/* Pick the first bss (strongest signal) */
return l_queue_peek_head(bss_list);
@ -502,8 +487,9 @@ static void passphrase_callback(enum agent_result result,
l_free(network->psk);
network->psk = l_malloc(32);
if (crypto_psk_from_passphrase(passphrase, (uint8_t *) network->ssid,
strlen(network->ssid),
if (crypto_psk_from_passphrase(passphrase,
(uint8_t *) network->info->ssid,
strlen(network->info->ssid),
network->psk) < 0) {
l_error("PMK generation failed. "
"Ensure Crypto Engine is properly configured");
@ -603,7 +589,7 @@ static struct l_dbus_message *network_connect(struct l_dbus *dbus,
if (!bss)
return dbus_error_not_supported(message);
switch (network->security) {
switch (network_get_security(network)) {
case SECURITY_PSK:
return network_connect_psk(network, bss, message);
case SECURITY_NONE:
@ -625,7 +611,7 @@ static bool network_property_get_name(struct l_dbus *dbus,
{
struct network *network = user_data;
l_dbus_message_builder_append_basic(builder, 's', network->ssid);
l_dbus_message_builder_append_basic(builder, 's', network->info->ssid);
return true;
}
@ -690,6 +676,9 @@ void network_remove(struct network *network, int reason)
l_queue_destroy(network->bss_list, NULL);
l_free(network->psk);
network_info_put(network->info);
l_free(network);
}
@ -705,7 +694,9 @@ void network_init()
void network_exit()
{
l_queue_destroy(networks, l_free);
l_queue_destroy(networks, network_info_free);
networks = NULL;
l_dbus_unregister_interface(dbus_get_bus(), IWD_NETWORK_INTERFACE);
}
@ -720,9 +711,6 @@ int network_rank_compare(const void *a, const void *b, void *user)
void network_rank_update(struct network *network)
{
bool connected;
unsigned int n;
const struct network_info *info = network_find_info(
network->ssid, network->security, &n);
int rank;
/*
@ -747,16 +735,24 @@ void network_rank_update(struct network *network)
*/
if (connected)
rank = INT_MAX;
else if (info) {
if (info->connected_time.tv_sec != 0) {
if (n >= L_ARRAY_SIZE(rankmod_table))
n = L_ARRAY_SIZE(rankmod_table) - 1;
else if (network->info->connected_time.tv_sec != 0) {
int n = network_find_rank_index(network->info);
rank = rankmod_table[n] * best_bss->rank + USHRT_MAX;
} else
rank = best_bss->rank;
if (n >= (int) L_ARRAY_SIZE(rankmod_table))
n = L_ARRAY_SIZE(rankmod_table) - 1;
rank = rankmod_table[n] * best_bss->rank + USHRT_MAX;
} else
rank = (int) best_bss->rank - USHRT_MAX; /* Negative rank */
network->rank = rank;
}
void network_info_foreach(network_info_foreach_func_t function,
void *user_data)
{
const struct l_queue_entry *entry;
for (entry = l_queue_get_entries(networks); entry; entry = entry->next)
function(entry->data, user_data);
}

15
src/network.h
View File

@ -21,6 +21,7 @@
*/
#include <stdbool.h>
#include <time.h>
struct device;
struct network;
@ -62,3 +63,17 @@ void network_exit();
int network_rank_compare(const void *a, const void *b, void *user);
void network_rank_update(struct network *network);
struct network_info {
char ssid[33];
enum security type;
struct timespec connected_time; /* Time last connected */
struct timespec seen_time; /* Time last seen */
int seen_count; /* Ref count for network.info */
};
typedef void (*network_info_foreach_func_t)(const struct network_info *info,
void *user_data);
void network_info_foreach(network_info_foreach_func_t function,
void *user_data);