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Ignore offline bootstrap nodes, small refactor of Nodes struct

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This commit is contained in:
Jfreegman
2016-09-21 12:51:57 -04:00
parent 221d761ff4
commit 703d5419a3
4 changed files with 75 additions and 44 deletions
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2
misc/toxic.conf.example
View File

@@ -45,7 +45,7 @@ ui = {
show_connection_msg=true;
// How often in days to update the DHT nodes list. (0 to disable updates)
nodeslist_update_freq=30;
nodeslist_update_freq=7;
// maximum lines for chat window history
history_size=700;

113
src/bootstrap.c
View File

@@ -49,34 +49,51 @@ extern struct user_settings *user_settings;
/* Number of nodes to bootstrap to per try */
#define NUM_BOOTSTRAP_NODES 5
#define IPv4_MAX_SIZE 64
/* Number of seconds since last successful ping before we consider a node offline */
#define NODE_OFFLINE_TIMOUT (60*60*24*2)
#define IP_MAX_SIZE 45
#define PORT_MAX_SIZE 5
#define LAST_SCAN_JSON_VALUE "\"last_scan\":"
#define LAST_SCAN_JSON_VALUE_LEN (sizeof(LAST_SCAN_JSON_VALUE) - 1)
#define LAST_SCAN_JSON_KEY "\"last_scan\":"
#define LAST_SCAN_JSON_KEY_LEN (sizeof(LAST_SCAN_JSON_KEY) - 1)
#define IPV4_JSON_VALUE "\"ipv4\":\""
#define IPV4_JSON_VALUE_LEN (sizeof(IPV4_JSON_VALUE) - 1)
#define IPV4_JSON_KEY "\"ipv4\":\""
#define IPV4_JSON_KEY_LEN (sizeof(IPV4_JSON_KEY) - 1)
#define PORT_JSON_VALUE "\"port\":"
#define PORT_JSON_VALUE_LEN (sizeof(PORT_JSON_VALUE) - 1)
#define PORT_JSON_KEY "\"port\":"
#define PORT_JSON_KEY_LEN (sizeof(PORT_JSON_KEY) - 1)
#define KEY_JSON_VALUE "\"public_key\":\""
#define KEY_JSON_VALUE_LEN (sizeof(KEY_JSON_VALUE) - 1)
#define PK_JSON_KEY "\"public_key\":\""
#define PK_JSON_KEY_LEN (sizeof(PK_JSON_KEY) - 1)
#define LAST_PING_JSON_KEY "\"last_ping\":"
#define LAST_PING_JSON_KEY_LEN (sizeof(LAST_PING_JSON_KEY) - 1)
/* Maximum allowable size of the nodes list */
#define MAX_NODELIST_SIZE (MAX_RECV_CURL_DATA_SIZE)
#define MIN_NODE_LINE 50 /* IP: 7 + port: 5 + key: 38 + spaces: 2 = 70. ! (& e.g. tox.chat = 8) */
#define MAX_NODE_LINE 300 /* Max number of chars in a sever line (name + port + key) */
#define MAXNODES 50
#define NODELEN (MAX_NODE_LINE - TOX_PUBLIC_KEY_SIZE - 7)
#define MAX_NODELIST_SIZE (1024 * MAXNODES)
struct Node {
char ip4[IP_MAX_SIZE + 1];
char ip6[IP_MAX_SIZE + 1];
char key[TOX_PUBLIC_KEY_SIZE];
uint16_t port;
};
static struct DHT_Nodes {
size_t lines;
char nodes[MAXNODES][NODELEN];
uint16_t ports[MAXNODES];
char keys[MAXNODES][TOX_PUBLIC_KEY_SIZE];
struct Node list[MAXNODES];
size_t count;
uint64_t last_updated;
} Nodes;
/* Determine if a node is offline by comparing the age of the nodeslist
* to the last time the node was successfully pinged.
*/
#define NODE_IS_OFFLINE(last_scan, last_ping) ((last_ping + NODE_OFFLINE_TIMOUT) <= (last_ping))
/* Return true if nodeslist pointed to by fp needs to be updated.
* This will be the case if the file is empty, has an invalid format,
* or if the file is older than the given timeout.
@@ -94,7 +111,7 @@ static bool nodeslist_needs_update(const char *nodes_path)
}
/* last_scan value should be at beginning of file */
char line[LAST_SCAN_JSON_VALUE_LEN + 32];
char line[LAST_SCAN_JSON_KEY_LEN + 32];
if (fgets(line, sizeof(line), fp) == NULL) {
fclose(fp);
@@ -103,14 +120,15 @@ static bool nodeslist_needs_update(const char *nodes_path)
fclose(fp);
const char *last_scan_val = strstr(line, LAST_SCAN_JSON_VALUE);
const char *last_scan_val = strstr(line, LAST_SCAN_JSON_KEY);
if (last_scan_val == NULL) {
return true;
}
last_scan_val += LAST_SCAN_JSON_VALUE_LEN;
last_scan_val += LAST_SCAN_JSON_KEY_LEN;
long long int last_scan = strtoll(last_scan_val, NULL, 10);
Nodes.last_updated = last_scan;
if (timed_out(last_scan, user_settings->nodeslist_update_freq * 24 * 60 * 60)) {
return true;
@@ -268,7 +286,7 @@ int load_DHT_nodeslist(void)
fprintf(stderr, "update_DHT_nodeslist() failed with error %d\n", update_err);
}
char line[MAX_NODELIST_SIZE];
char line[MAX_NODELIST_SIZE + 1];
if (fgets(line, sizeof(line), fp) == NULL) {
fclose(fp);
@@ -277,18 +295,18 @@ int load_DHT_nodeslist(void)
const char *line_start = line;
while ((line_start = strstr(line_start + 1, IPV4_JSON_VALUE)) && Nodes.lines < MAXNODES) {
while ((line_start = strstr(line_start + 1, IPV4_JSON_KEY)) && Nodes.count < MAXNODES) {
/* Extract IPv4 address */
const char *ip_start = strstr(line_start, IPV4_JSON_VALUE);
const char *ip_start = strstr(line_start, IPV4_JSON_KEY);
if (ip_start == NULL) {
continue;
}
ip_start += IPV4_JSON_VALUE_LEN;
ip_start += IPV4_JSON_KEY_LEN;
int ip_len = char_find(0, ip_start, '"');
if (ip_len == 0 || ip_len > IPv4_MAX_SIZE) {
if (ip_len == 0 || ip_len > IP_MAX_SIZE) {
continue;
}
@@ -302,13 +320,13 @@ int load_DHT_nodeslist(void)
}
/* Extract port */
const char *port_start = strstr(ip_start, PORT_JSON_VALUE);
const char *port_start = strstr(ip_start, PORT_JSON_KEY);
if (!port_start) {
continue;
}
port_start += PORT_JSON_VALUE_LEN;
port_start += PORT_JSON_KEY_LEN;
int port_len = char_find(0, port_start, ',');
if (port_len == 0 || port_len > PORT_MAX_SIZE) {
@@ -326,13 +344,13 @@ int load_DHT_nodeslist(void)
}
/* Extract key */
const char *key_start = strstr(port_start, KEY_JSON_VALUE);
const char *key_start = strstr(port_start, PK_JSON_KEY);
if (!key_start) {
continue;
}
key_start += KEY_JSON_VALUE_LEN;
key_start += PK_JSON_KEY_LEN;
int key_len = char_find(0, key_start, '"');
if (key_len != TOX_PUBLIC_KEY_SIZE * 2) {
@@ -343,20 +361,33 @@ int load_DHT_nodeslist(void)
memcpy(key_string, key_start, TOX_PUBLIC_KEY_SIZE * 2);
key_string[TOX_PUBLIC_KEY_SIZE * 2] = 0;
/* Add entry to nodes list */
snprintf(Nodes.nodes[Nodes.lines], sizeof(Nodes.nodes[Nodes.lines]), "%s", ipv4_string);
Nodes.ports[Nodes.lines] = port;
/* Check last pinged value and ignore nodes that appear offline */
const char *last_pinged_str = strstr(key_start, LAST_PING_JSON_KEY);
if (hex_string_to_bin(key_string, key_len, Nodes.keys[Nodes.lines], TOX_PUBLIC_KEY_SIZE) == -1)
if (!last_pinged_str) {
continue;
}
Nodes.lines++;
last_pinged_str += LAST_PING_JSON_KEY_LEN;
long long int last_pinged = strtoll(last_pinged_str, NULL, 10);
if (last_pinged <= 0 || NODE_IS_OFFLINE(Nodes.last_scan, last_pinged)) {
continue;
}
/* Add entry to nodes list */
size_t idx = Nodes.count++;
snprintf(Nodes.list[idx].ip4, sizeof(Nodes.list[idx].ip4), "%s", ipv4_string);
Nodes.list[idx].port = port;
if (hex_string_to_bin(key_string, key_len, Nodes.list[idx].key, TOX_PUBLIC_KEY_SIZE) == -1)
continue;
}
/* If nodeslist does not contain any valid entries we set the last_scan value
* to 0 so that it will fetch a new list the next time this function is called.
*/
if (Nodes.lines == 0) {
if (Nodes.count == 0) {
const char *s = "{\"last_scan\":0}";
rewind(fp);
fwrite(s, strlen(s), 1, fp); // Not much we can do if it fails
@@ -371,26 +402,26 @@ int load_DHT_nodeslist(void)
/* Connects to NUM_BOOTSTRAP_NODES random DHT nodes listed in the DHTnodes file. */
static void DHT_bootstrap(Tox *m)
{
if (Nodes.lines == 0) {
if (Nodes.count == 0) {
return;
}
size_t i;
for (i = 0; i < NUM_BOOTSTRAP_NODES; ++i) {
size_t node = rand() % Nodes.lines;
size_t node = rand() % Nodes.count;
TOX_ERR_BOOTSTRAP err;
tox_bootstrap(m, Nodes.nodes[node], Nodes.ports[node], (uint8_t *) Nodes.keys[node], &err);
tox_bootstrap(m, Nodes.list[node].ip4, Nodes.list[node].port, (uint8_t *) Nodes.list[node].key, &err);
if (err != TOX_ERR_BOOTSTRAP_OK) {
fprintf(stderr, "Failed to bootstrap %s:%d\n", Nodes.nodes[node], Nodes.ports[node]);
fprintf(stderr, "Failed to bootstrap %s:%d\n", Nodes.list[node].ip4, Nodes.list[node].port);
}
tox_add_tcp_relay(m, Nodes.nodes[node], Nodes.ports[node], (uint8_t *) Nodes.keys[node], &err);
tox_add_tcp_relay(m, Nodes.list[node].ip4, Nodes.list[node].port, (uint8_t *) Nodes.list[node].key, &err);
if (err != TOX_ERR_BOOTSTRAP_OK) {
fprintf(stderr, "Failed to add TCP relay %s:%d\n", Nodes.nodes[node], Nodes.ports[node]);
fprintf(stderr, "Failed to add TCP relay %s:%d\n", Nodes.list[node].ip4, Nodes.list[node].port);
}
}
}

2
src/settings.c
View File

@@ -116,7 +116,7 @@ static void ui_defaults(struct user_settings* settings)
settings->show_typing_other = SHOW_TYPING_ON;
settings->show_welcome_msg = SHOW_WELCOME_MSG_ON;
settings->show_connection_msg = SHOW_CONNECTION_MSG_ON;
settings->nodeslist_update_freq = 30;
settings->nodeslist_update_freq = 7;
snprintf(settings->line_join, LINE_HINT_MAX + 1, "%s", LINE_JOIN);
snprintf(settings->line_quit, LINE_HINT_MAX + 1, "%s", LINE_QUIT);

2
src/toxic.c
View File

@@ -1143,7 +1143,7 @@ int main(int argc, char **argv)
int nodeslist_ret = load_DHT_nodeslist();
if (nodeslist_ret != 0) {
queue_init_message("DHT nodeslist failed to load (error %d)\n", nodeslist_ret);
queue_init_message("DHT nodeslist failed to load (error %d)", nodeslist_ret);
}
#ifdef X11