/*
* Resolve a hostname through Tor and set the ip address in the given pointer.
*
* Return 0 on success else a negative value and the result addr is untouched.
*/
int tsocks_tor_resolve(const char *hostname, uint32_t *ip_addr)
{
int ret;
struct connection conn;
assert(hostname);
assert(ip_addr);
ret = hosts_file_resolve(hostname, ip_addr);
if (!ret) {
goto end;
}
DBG("Resolving %s on the Tor network", hostname);
/*
* Tor hidden service address have no IP address so we send back an onion
* reserved IP address that acts as a cookie that we will use to find the
* onion hostname at the connect() stage.
*/
if (utils_strcasecmpend(hostname, ".onion") == 0) {
struct onion_entry *entry;
entry = get_onion_entry(hostname, &tsocks_onion_pool);
if (entry) {
memcpy(ip_addr, &entry->ip, sizeof(entry->ip));
ret = 0;
goto end;
}
}
conn.fd = tsocks_libc_socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (conn.fd < 0) {
PERROR("socket");
ret = -errno;
goto error;
}
ret = setup_tor_connection(&conn);
if (ret < 0) {
goto error;
}
ret = socks5_send_resolve_request(hostname, &conn);
if (ret < 0) {
goto error;
}
/* Force IPv4 resolution for now. */
ret = socks5_recv_resolve_reply(&conn, ip_addr, sizeof(uint32_t));
if (ret < 0) {
goto error;
}
ret = close(conn.fd);
if (ret < 0) {
PERROR("close");
}
end:
error:
return ret;
}
/*
* Resolve a hostname through Tor and set the ip address in the given pointer.
*
* Return 0 on success else a negative value and the result addr is untouched.
*/
int tsocks_tor_resolve(int af, const char *hostname, void *ip_addr)
{
int ret;
size_t addr_len;
struct connection conn;
assert(hostname);
assert(ip_addr);
if (af == AF_INET) {
addr_len = sizeof(uint32_t);
conn.dest_addr.domain = CONNECTION_DOMAIN_INET;
} else if (af == AF_INET6) {
addr_len = 16;
conn.dest_addr.domain = CONNECTION_DOMAIN_INET6;
/* Tor daemon does not support IPv6 DNS resolution yet. */
ret = -ENOSYS;
goto error;
} else {
ret = -EINVAL;
goto error;
}
ret = utils_localhost_resolve(hostname, af, ip_addr, addr_len);
if (ret) {
/* Found to be a localhost name. */
ret = 0;
goto end;
}
DBG("Resolving %s on the Tor network", hostname);
/*
* Tor hidden service address have no IP address so we send back an onion
* reserved IP address that acts as a cookie that we will use to find the
* onion hostname at the connect() stage.
*/
if (utils_strcasecmpend(hostname, ".onion") == 0) {
struct onion_entry *entry;
entry = get_onion_entry(hostname, &tsocks_onion_pool);
if (entry) {
memcpy(ip_addr, &entry->ip, sizeof(entry->ip));
ret = 0;
goto end;
}
}
conn.fd = tsocks_libc_socket(af, SOCK_STREAM, IPPROTO_TCP);
if (conn.fd < 0) {
PERROR("socket");
ret = -errno;
goto error;
}
ret = setup_tor_connection(&conn, SOCKS5_NO_AUTH_METHOD);
if (ret < 0) {
goto end_close;
}
ret = socks5_send_resolve_request(hostname, &conn);
if (ret < 0) {
goto end_close;
}
/* Force IPv4 resolution for now. */
ret = socks5_recv_resolve_reply(&conn, ip_addr, addr_len);
if (ret < 0) {
goto end_close;
}
end_close:
if (tsocks_libc_close(conn.fd) < 0) {
PERROR("close");
}
end:
error:
return ret;
}
