mirror of
https://github.com/Tha14/toxic.git
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Use DNS server list instead of hard coding domains/keys
This commit is contained in:
Jfreegman
parent
2f12a8d429
commit
d9a861331f
@ -1,7 +1,7 @@
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MISC_DIR = ../misc
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DOC_DIR = ../doc
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SND_DIR = ../sounds
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DATAFILES = DHTnodes toxic.conf.example
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DATAFILES = DHTnodes DNSservers toxic.conf.example
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MANFILES = toxic.1 toxic.conf.5
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SNDFILES = ContactLogsIn.wav ContactLogsOut.wav Error.wav IncomingCall.wav
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SNDFILES += LogIn.wav LogOut.wav NewMessage.wav OutgoingCall.wav
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2
misc/DNSservers
Normal file
2
misc/DNSservers
Normal file
@ -0,0 +1,2 @@
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utox.org d3154f65d28a5b41a05d4ac7e4b39c6b1c233cc857fb365c56e8392737462a12
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toxme.se 5d72c517df6aec54f1e977a6b6f25914ea4cf7277a85027cd9f5196df17e0b13
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128
src/dns.c
128
src/dns.c
@ -40,19 +40,21 @@
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#include "dns.h"
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#include "global_commands.h"
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#include "misc_tools.h"
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#include "configdir.h"
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#define DNS3_KEY_SIZE 32
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#define MAX_DNS_REQST_SIZE 256
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#define NUM_DNS3_SERVERS 2 /* must correspond to number of items in dns3_servers array */
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#define NUM_DNS3_BACKUP_SERVERS 2 /* must correspond to number of items in dns3_servers array */
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#define TOX_DNS3_TXT_PREFIX "v=tox3;id="
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#define DNS3_KEY_SZ 32
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extern struct _Winthread Winthread;
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extern struct _dns3_servers dns3_servers;
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/* TODO: process keys from key file instead of hard-coding like a noob */
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static struct dns3_server {
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/* Hardcoded backup in case domain list is not loaded */
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static struct dns3_server_backup {
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const char *name;
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char key[DNS3_KEY_SZ];
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} dns3_servers[] = {
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char key[DNS3_KEY_SIZE];
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} dns3_servers_backup[] = {
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{
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"utox.org",
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{
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@ -84,6 +86,54 @@ static struct _dns_thread {
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} dns_thread;
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#define MAX_DNS_SERVERS 50
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#define MAX_DOMAIN_SIZE 128
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#define MAX_DNS_LINE MAX_DOMAIN_SIZE + DNS3_KEY_SIZE + 2
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struct _dns3_servers {
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bool loaded;
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int lines;
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char names[MAX_DNS_SERVERS][MAX_DOMAIN_SIZE];
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char keys[MAX_DNS_SERVERS][DNS3_KEY_SIZE];
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} dns3_servers;
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static int load_dns_domainlist(void)
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{
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const char *path = PACKAGE_DATADIR "/DNSservers";
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FILE *fp = fopen(path, "r");
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if (fp == NULL)
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return -1;
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char line[MAX_DNS_LINE];
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while (fgets(line, sizeof(line), fp) && dns3_servers.lines < MAX_DNS_SERVERS) {
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if (strlen(line) < (2 * DNS3_KEY_SIZE) + 4)
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continue;
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const char *name = strtok(line, " ");
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const char *keystr = strtok(NULL, " ");
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if (name == NULL || keystr == NULL)
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continue;
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snprintf(dns3_servers.names[dns3_servers.lines], sizeof(dns3_servers.names[dns3_servers.lines]), "%s", name);
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int res = hex_string_to_bytes(dns3_servers.keys[dns3_servers.lines], DNS3_KEY_SIZE, keystr, strlen(keystr));
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if (res == -1)
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continue;
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++dns3_servers.lines;
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}
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fclose(fp);
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if (dns3_servers.lines < 1)
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return -2;
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return 0;
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}
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static int dns_error(ToxWindow *self, const char *errmsg)
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{
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pthread_mutex_lock(&Winthread.lock);
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@ -191,35 +241,61 @@ static int parse_addr(const char *addr, char *namebuf, char *dombuf)
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return strlen(namebuf);
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}
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/* matches input domain name with domains in list and obtains key. Return 0 on success, -1 on failure */
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static int get_domain_match(char *pubkey, char *domain, const char *inputdomain)
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{
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/* check server list first */
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int i;
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bool match = false;
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for (i = 0; i < dns3_servers.lines; ++i) {
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if (strcmp(dns3_servers.names[i], inputdomain) == 0) {
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memcpy(pubkey, dns3_servers.keys[i], DNS3_KEY_SIZE);
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snprintf(domain, MAX_DOMAIN_SIZE, "%s", dns3_servers.names[i]);
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match = true;
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break;
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}
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}
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/* fall back to hard-coded domains on server list failure */
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if (!match) {
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for (i = 0; i < NUM_DNS3_BACKUP_SERVERS; ++i) {
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if (strcmp(dns3_servers_backup[i].name, inputdomain) == 0) {
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memcpy(pubkey, dns3_servers_backup[i].key, DNS3_KEY_SIZE);
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snprintf(domain, MAX_DOMAIN_SIZE, "%s", dns3_servers_backup[i].name);
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match = true;
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break;
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}
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}
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if (!match)
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return -1;
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}
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return 0;
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}
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/* Does DNS lookup for addr and puts resulting tox id in id_bin. */
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void *dns3_lookup_thread(void *data)
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{
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ToxWindow *self = t_data.self;
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char domain[MAX_STR_SIZE];
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char inputdomain[MAX_STR_SIZE];
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char name[MAX_STR_SIZE];
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int namelen = parse_addr(t_data.addr, name, domain);
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int namelen = parse_addr(t_data.addr, name, inputdomain);
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if (namelen == -1) {
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dns_error(self, "Must be a Tox ID or an address in the form username@domain");
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kill_dns_thread(NULL);
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}
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/* get domain name/pub key */
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const char *DNS_pubkey = NULL;
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const char *domname = NULL;
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int i;
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char DNS_pubkey[DNS3_KEY_SIZE];
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char domain[MAX_DOMAIN_SIZE];
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for (i = 0; i < NUM_DNS3_SERVERS; ++i) {
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if (strcmp(dns3_servers[i].name, domain) == 0) {
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DNS_pubkey = dns3_servers[i].key;
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domname = dns3_servers[i].name;
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break;
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}
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}
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int match = get_domain_match(DNS_pubkey, domain, inputdomain);
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if (domname == NULL) {
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if (match == -1) {
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dns_error(self, "Domain not found.");
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kill_dns_thread(NULL);
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}
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@ -248,7 +324,7 @@ void *dns3_lookup_thread(void *data)
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char d_string[MAX_DNS_REQST_SIZE];
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/* format string and create dns query */
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snprintf(d_string, sizeof(d_string), "_%s._tox.%s", string, domname);
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snprintf(d_string, sizeof(d_string), "_%s._tox.%s", string, domain);
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int ans_len = res_query(d_string, C_IN, T_TXT, answer, sizeof(answer));
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if (ans_len <= 0) {
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@ -296,6 +372,16 @@ void dns3_lookup(ToxWindow *self, Tox *m, const char *id_bin, const char *addr,
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return;
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}
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if (!dns3_servers.loaded) {
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dns3_servers.loaded = true;
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int ret = load_dns_domainlist();
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if (ret < 0) {
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const char *errmsg = "DNS server list failed to load with error code %d. Falling back to hard-coded list.";
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line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, errmsg, ret);
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}
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}
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snprintf(t_data.id_bin, sizeof(t_data.id_bin), "%s", id_bin);
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snprintf(t_data.addr, sizeof(t_data.addr), "%s", addr);
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snprintf(t_data.msg, sizeof(t_data.msg), "%s", msg);
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@ -124,6 +124,25 @@ char *hex_string_to_bin(const char *hex_string)
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return val;
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}
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int hex_string_to_bytes(char *buf, int size, const char *keystr, int strsize)
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{
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if (size % 2 != 0)
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return -1;
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int i, res;
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const char *pos = keystr;
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for (i = 0; i < size; ++i) {
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res = sscanf(pos, "%2hhx", &buf[i]);
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pos += 2;
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if (res == EOF || res < 1)
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return -1;
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}
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return 0;
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}
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/* Returns 1 if the string is empty, 0 otherwise */
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int string_is_empty(const char *string)
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{
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@ -42,6 +42,9 @@ void host_to_net(uint8_t *num, uint16_t numbytes);
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/* convert a hex string to binary */
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char *hex_string_to_bin(const char *hex_string);
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/* convert a hex string to bytes. returns 0 on success, -1 on failure */
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int hex_string_to_bytes(char *buf, int size, const char *keystr, int strsize);
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/* get the current unix time */
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uint64_t get_unix_time(void);
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27
src/toxic.c
27
src/toxic.c
@ -226,10 +226,10 @@ static Tox *init_tox(int ipv4)
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return m;
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}
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#define MINLINE 50 /* IP: 7 + port: 5 + key: 38 + spaces: 2 = 70. ! (& e.g. tox.im = 6) */
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#define MAXLINE 256 /* Approx max number of chars in a sever line (name + port + key) */
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#define MIN_NODE_LINE 50 /* IP: 7 + port: 5 + key: 38 + spaces: 2 = 70. ! (& e.g. tox.im = 6) */
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#define MAX_NODE_LINE 256 /* Approx max number of chars in a sever line (name + port + key) */
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#define MAXNODES 50
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#define NODELEN (MAXLINE - TOX_CLIENT_ID_SIZE - 7)
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#define NODELEN (MAX_NODE_LINE - TOX_CLIENT_ID_SIZE - 7)
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static struct _toxNodes {
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int lines;
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@ -238,7 +238,7 @@ static struct _toxNodes {
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char keys[MAXNODES][TOX_CLIENT_ID_SIZE];
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} toxNodes;
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static int nodelist_load(const char *filename)
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static int load_nodelist(const char *filename)
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{
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if (!filename)
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return 1;
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@ -248,10 +248,10 @@ static int nodelist_load(const char *filename)
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if (fp == NULL)
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return 1;
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char line[MAXLINE];
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char line[MAX_NODE_LINE];
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while (fgets(line, sizeof(line), fp) && toxNodes.lines < MAXNODES) {
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if (strlen(line) > MINLINE) {
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if (strlen(line) > MIN_NODE_LINE) {
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const char *name = strtok(line, " ");
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const char *port = strtok(NULL, " ");
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const char *key_ascii = strtok(NULL, " ");
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@ -272,12 +272,11 @@ static int nodelist_load(const char *filename)
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}
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}
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if (toxNodes.lines < 1) {
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fclose(fp);
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return 2;
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}
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fclose(fp);
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if (toxNodes.lines < 1)
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return 1;
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return 0;
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}
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@ -313,11 +312,11 @@ int init_connection(Tox *m)
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int res;
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if (!arg_opts.nodes_path[0])
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res = nodelist_load(PACKAGE_DATADIR "/DHTnodes");
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res = load_nodelist(PACKAGE_DATADIR "/DHTnodes");
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else
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res = nodelist_load(arg_opts.nodes_path);
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res = load_nodelist(arg_opts.nodes_path);
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if (toxNodes.lines < 1)
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if (res != 0)
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return res;
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res = 3;
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