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Initial work for local multicast registering (work in progress)

pull/53/head
Luca Deri 6 years ago
parent
fd356cde64
commit
dd899b3a4d
5 changed files with 184 additions and 150 deletions
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  1. 33
      edge.c
  2. 100
      edge_utils.c
  3. 1
      n2n.c
  4. 3
      n2n.h
  5. 3
      n2n_wire.h

33
edge.c
View File

@ -324,10 +324,8 @@ static int setOption(int optkey, char *optargument, edge_conf_t *ec, n2n_edge_t
}
case 'v': /* verbose */
{
++traceLevel; /* do 2 -v flags to increase verbosity to DEBUG level*/
traceLevel = 4; /* DEBUG */
break;
}
default:
{
@ -679,17 +677,42 @@ int main(int argc, char* argv[]) {
}
/* else run in NULL mode */
/* Populate the multicast group for local edge */
eee.multicast_peer.family = AF_INET;
eee.multicast_peer.port = N2N_MULTICAST_PORT;
eee.multicast_peer.addr.v4[0] = 224; /* N2N_MULTICAST_GROUP */
eee.multicast_peer.addr.v4[1] = 0;
eee.multicast_peer.addr.v4[2] = 0;
eee.multicast_peer.addr.v4[3] = 68;
eee.udp_sock = open_socket(ec.local_port, 1 /* bind ANY */);
if(eee.udp_sock < 0) {
traceEvent(TRACE_ERROR, "Failed to bind main UDP port %u", (signed int)ec.local_port);
return(-1);
}
eee.udp_mgmt_sock = open_socket(ec.mgmt_port, 0 /* bind LOOPBACK */);
eee.udp_mgmt_sock = open_socket(eee.multicast_peer.port, 0 /* bind LOOPBACK */);
if(eee.udp_mgmt_sock < 0) {
traceEvent(TRACE_ERROR, "Failed to bind management UDP port %u", ec.mgmt_port);
return(-1);
} else {
}
eee.udp_multicast_sock = open_socket(N2N_MULTICAST_PORT, 1 /* bind ANY */);
if(eee.udp_multicast_sock < 0)
return(-5);
else {
/* Bind eee.udp_multicast_sock to multicast group */
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(N2N_MULTICAST_GROUP);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(eee.udp_multicast_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
traceEvent(TRACE_ERROR, "Failed to bind to local multicast group %s:%u",
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT);
return(-6);
}
}
traceEvent(TRACE_NORMAL, "edge started");

100
edge_utils.c
View File

@ -77,6 +77,7 @@ int edge_init(n2n_edge_t * eee) {
eee->null_transop = 0;
eee->udp_sock = -1;
eee->udp_mgmt_sock = -1;
eee->udp_multicast_sock = -1;
eee->dyn_ip_mode = 0;
eee->allow_routing = 0;
eee->drop_multicast = 1;
@ -177,15 +178,13 @@ void supernode2addr(n2n_sock_t * sn, const n2n_sn_name_t addrIn) {
static void try_send_register(n2n_edge_t * eee,
uint8_t from_supernode,
const n2n_mac_t mac,
const n2n_sock_t * peer)
{
const n2n_sock_t * peer) {
/* REVISIT: purge of pending_peers not yet done. */
struct peer_info * scan = find_peer_by_mac(eee->pending_peers, mac);
macstr_t mac_buf;
n2n_sock_str_t sockbuf;
if(NULL == scan)
{
if(scan == NULL) {
scan = calloc(1, sizeof(struct peer_info));
memcpy(scan->mac_addr, mac, N2N_MAC_SIZE);
@ -205,8 +204,12 @@ static void try_send_register(n2n_edge_t * eee,
send_register(eee, &(scan->sock));
/* no send registration to the local multicast group */
traceEvent(TRACE_INFO, "Registering with multicast group %s:%u",
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT);
send_register(eee, &(eee->multicast_peer));
/* pending_peers now owns scan. */
} else {
}
}
@ -219,13 +222,10 @@ void check_peer(n2n_edge_t * eee,
const n2n_sock_t * peer) {
struct peer_info * scan = find_peer_by_mac(eee->known_peers, mac);
if(NULL == scan)
{
if(NULL == scan) {
/* Not in known_peers - start the REGISTER process. */
try_send_register(eee, from_supernode, mac, peer);
}
else
{
} else {
/* Already in known_peers. */
update_peer_address(eee, from_supernode, mac, peer, time(NULL));
}
@ -470,9 +470,7 @@ static void send_register_super(n2n_edge_t * eee,
memcpy(cmn.community, eee->community_name, N2N_COMMUNITY_SIZE);
for(idx=0; idx < N2N_COOKIE_SIZE; ++idx)
{
eee->last_cookie[idx] = rand() % 0xff;
}
memcpy(reg.cookie, eee->last_cookie, N2N_COOKIE_SIZE);
reg.auth.scheme=0; /* No auth yet */
@ -564,23 +562,17 @@ static void send_register_ack(n2n_edge_t * eee,
* This is frequently called by the main loop.
*/
void update_supernode_reg(n2n_edge_t * eee, time_t nowTime) {
if(eee->sn_wait && (nowTime > (eee->last_register_req + (eee->register_lifetime/10))))
{
if(eee->sn_wait && (nowTime > (eee->last_register_req + (eee->register_lifetime/10)))) {
/* fall through */
traceEvent(TRACE_DEBUG, "update_supernode_reg: doing fast retry.");
}
else if(nowTime < (eee->last_register_req + eee->register_lifetime))
{
} else if(nowTime < (eee->last_register_req + eee->register_lifetime))
return; /* Too early */
}
if(0 == eee->sup_attempts)
{
if(0 == eee->sup_attempts) {
/* Give up on that supernode and try the next one. */
++(eee->sn_idx);
if (eee->sn_idx >= eee->sn_num)
{
if (eee->sn_idx >= eee->sn_num) {
/* Got to end of list, go back to the start. Also works for list of one entry. */
eee->sn_idx=0;
}
@ -591,14 +583,10 @@ void update_supernode_reg(n2n_edge_t * eee, time_t nowTime) {
eee->sup_attempts = N2N_EDGE_SUP_ATTEMPTS;
}
else
{
--(eee->sup_attempts);
}
if(eee->re_resolve_supernode_ip || (eee->sn_num > 1))
{
supernode2addr(&(eee->supernode), eee->sn_ip_array[eee->sn_idx]);
}
traceEvent(TRACE_DEBUG, "Registering with supernode (%s) (attempts left %u)",
supernode_ip(eee), (unsigned int)eee->sup_attempts);
@ -786,7 +774,7 @@ static void readFromMgmtSocket(n2n_edge_t * eee, int * keep_running) {
now = time(NULL);
i = sizeof(sender_sock);
recvlen=recvfrom(eee->udp_mgmt_sock, udp_buf, N2N_PKT_BUF_SIZE, 0/*flags*/,
recvlen = recvfrom(eee->udp_mgmt_sock, udp_buf, N2N_PKT_BUF_SIZE, 0/*flags*/,
(struct sockaddr *)&sender_sock, (socklen_t*)&i);
if(recvlen < 0)
@ -1230,7 +1218,7 @@ static void startTunReadThread(n2n_edge_t *eee) {
/* ************************************** */
/** Read a datagram from the main UDP socket to the internet. */
static void readFromIPSocket(n2n_edge_t * eee) {
static void readFromIPSocket(n2n_edge_t * eee, int in_sock) {
n2n_common_t cmn; /* common fields in the packet header */
n2n_sock_str_t sockbuf1;
@ -1252,11 +1240,10 @@ static void readFromIPSocket(n2n_edge_t * eee) {
size_t i;
i = sizeof(sender_sock);
recvlen=recvfrom(eee->udp_sock, udp_buf, N2N_PKT_BUF_SIZE, 0/*flags*/,
recvlen = recvfrom(in_sock, udp_buf, N2N_PKT_BUF_SIZE, 0/*flags*/,
(struct sockaddr *)&sender_sock, (socklen_t*)&i);
if(recvlen < 0)
{
if(recvlen < 0) {
traceEvent(TRACE_ERROR, "recvfrom failed with %s", strerror(errno));
return; /* failed to receive data from UDP */
@ -1264,7 +1251,7 @@ static void readFromIPSocket(n2n_edge_t * eee) {
/* REVISIT: when UDP/IPv6 is supported we will need a flag to indicate which
* IP transport version the packet arrived on. May need to UDP sockets. */
sender.family = AF_INET; /* udp_sock was opened PF_INET v4 */
sender.family = AF_INET; /* UDP socket was opened PF_INET v4 */
sender.port = ntohs(sender_sock.sin_port);
memcpy(&(sender.addr.v4), &(sender_sock.sin_addr.s_addr), IPV4_SIZE);
@ -1343,9 +1330,7 @@ static void readFromIPSocket(n2n_edge_t * eee) {
decode_REGISTER_ACK(&ra, &cmn, udp_buf, &rem, &idx);
if(ra.sock.family)
{
orig_sender = &(ra.sock);
}
traceEvent(TRACE_INFO, "Rx REGISTER_ACK src=%s dst=%s from peer %s (%s)",
macaddr_str(mac_buf1, ra.srcMac),
@ -1448,6 +1433,9 @@ int run_edge_loop(n2n_edge_t * eee, int *keep_running) {
FD_SET(eee->udp_sock, &socket_mask);
FD_SET(eee->udp_mgmt_sock, &socket_mask);
max_sock = max(eee->udp_sock, eee->udp_mgmt_sock);
FD_SET(eee->udp_multicast_sock, &socket_mask);
max_sock = max(eee->udp_sock, eee->udp_multicast_sock);
#ifndef WIN32
FD_SET(eee->device.fd, &socket_mask);
max_sock = max(max_sock, eee->device.fd);
@ -1459,22 +1447,26 @@ int run_edge_loop(n2n_edge_t * eee, int *keep_running) {
nowTime=time(NULL);
/* Make sure ciphers are updated before the packet is treated. */
if((nowTime - lastTransop) > TRANSOP_TICK_INTERVAL)
{
if((nowTime - lastTransop) > TRANSOP_TICK_INTERVAL) {
lastTransop = nowTime;
n2n_tick_transop(eee, nowTime);
}
if(rc > 0)
{
if(rc > 0) {
/* Any or all of the FDs could have input; check them all. */
if(FD_ISSET(eee->udp_sock, &socket_mask))
{
/* Read a cooked socket from the internet socket. Writes on the TAP
if(FD_ISSET(eee->udp_sock, &socket_mask)) {
/* Read a cooked socket from the internet socket (unicast). Writes on the TAP
* socket. */
readFromIPSocket(eee);
readFromIPSocket(eee, eee->udp_sock);
}
if(FD_ISSET(eee->udp_multicast_sock, &socket_mask)) {
/* Read a cooked socket from the internet socket (multicast). Writes on the TAP
* socket. */
traceEvent(TRACE_WARNING, "**** Received packet from multicast socket ****");
readFromIPSocket(eee, eee->udp_multicast_sock);
}
#ifdef __ANDROID_NDK__
@ -1500,8 +1492,6 @@ int run_edge_loop(n2n_edge_t * eee, int *keep_running) {
}
/* Finished processing select data. */
update_supernode_reg(eee, nowTime);
numPurged = purge_expired_registrations(&(eee->known_peers));
@ -1593,9 +1583,7 @@ int edge_init_keyschedule(n2n_edge_t * eee) {
n2n_tick_transop(eee, now);
}
else
{
traceEvent(TRACE_ERROR, "Failed to process '%s'", eee->keyschedule);
}
return retval;
}
@ -1610,6 +1598,9 @@ void edge_term(n2n_edge_t * eee) {
if(eee->udp_mgmt_sock >= 0)
closesocket(eee->udp_mgmt_sock);
if(eee->udp_multicast_sock >= 0)
closesocket(eee->udp_multicast_sock);
clear_peer_list(&(eee->pending_peers));
clear_peer_list(&(eee->known_peers));
@ -1670,10 +1661,25 @@ int quick_edge_init(char *device_name, char *community_name,
return(-3);
eee.udp_mgmt_sock = open_socket(0 /* any port */, 0 /* bind LOOPBACK */);
if(eee.udp_mgmt_sock < 0)
return(-4);
eee.udp_multicast_sock = open_socket(N2N_MULTICAST_PORT, 1 /* bind ANY */);
if(eee.udp_multicast_sock < 0)
return(-5);
else {
/* Bind eee.udp_multicast_sock to multicast group */
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(N2N_MULTICAST_GROUP);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
if (setsockopt(eee.udp_multicast_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
traceEvent(TRACE_ERROR, "Failed to bind to local multicast group %s:%u",
N2N_MULTICAST_GROUP, N2N_MULTICAST_PORT);
return(-6);
}
}
update_supernode_reg(&eee, time(NULL));
return(run_edge_loop(&eee, keep_on_running));

1
n2n.c
View File

@ -58,6 +58,7 @@ SOCKET open_socket(int local_port, int bind_any) {
local_address.sin_family = AF_INET;
local_address.sin_port = htons(local_port);
local_address.sin_addr.s_addr = htonl(bind_any ? INADDR_ANY : INADDR_LOOPBACK);
if(bind(sock_fd,(struct sockaddr*) &local_address, sizeof(local_address)) == -1) {
traceEvent(TRACE_ERROR, "Bind error on local port %u [%s]\n", local_port, strerror(errno));
return(-1);

3
n2n.h
View File

@ -199,6 +199,7 @@ struct n2n_edge {
int udp_sock;
int udp_mgmt_sock; /**< socket for status info. */
int udp_multicast_sock; /**< socket for local multicast registrations. */
tuntap_dev device; /**< All about the TUNTAP device */
int dyn_ip_mode; /**< Interface IP address is dynamically allocated, eg. DHCP. */
@ -207,7 +208,7 @@ struct n2n_edge {
n2n_trans_op_t transop[N2N_MAX_TRANSFORMS]; /* one for each transform at fixed positions */
size_t tx_transop_idx; /**< The transop to use when encoding. */
n2n_sock_t multicast_peer; /**< Multicast peer group (for local edges) */
struct peer_info * known_peers; /**< Edges we are connected to. */
struct peer_info * pending_peers; /**< Edges we have tried to register with. */
time_t last_register_req; /**< Check if time to re-register with super*/

3
n2n_wire.h
View File

@ -42,6 +42,9 @@
#define N2N_PKT_BUF_SIZE 2048
#define N2N_SOCKBUF_SIZE 64 /* string representation of INET or INET6 sockets */
#define N2N_MULTICAST_PORT 1968
#define N2N_MULTICAST_GROUP "224.0.0.68"
typedef uint8_t n2n_community_t[N2N_COMMUNITY_SIZE];
typedef uint8_t n2n_mac_t[N2N_MAC_SIZE];
typedef uint8_t n2n_cookie_t[N2N_COOKIE_SIZE];

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