void strip_mac_addresses(vpn_packet_t *p)
{
unsigned char tmp[MAXSIZE];
-
+cp
memcpy(tmp, p->data, p->len);
p->len -= 12;
memcpy(p->data, &tmp[12], p->len);
+cp
}
/*
void add_mac_addresses(vpn_packet_t *p)
{
unsigned char tmp[MAXSIZE];
-
+cp
memcpy(&tmp[12], p->data, p->len);
p->len += 12;
tmp[0] = tmp[6] = 0xfe;
*((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip));
*((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26]));
memcpy(p->data, &tmp[0], p->len);
+cp
}
int xsend(conn_list_t *cl, void *packet)
{
int r;
real_packet_t rp;
-
+cp
do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
rp.from = myself->vpn_ip;
}
total_socket_out += r;
-
+cp
return 0;
}
-/*
- write as many bytes as possible to the tap
- device, possibly in multiple turns.
-*/
-int write_n(int fd, void *buf, size_t len)
-{
- int r, done = 0;
-
- do
- {
- if((r = write(fd, buf, len)) < 0)
- return -1;
- len -= r;
- buf += r;
- done += r;
- } while(len > 0);
-
- return done;
-}
-
int xrecv(conn_list_t *cl, void *packet)
{
vpn_packet_t vp;
int lenin;
-
+cp
do_decrypt((real_packet_t*)packet, &vp, cl->key);
add_mac_addresses(&vp);
- if((lenin = write_n(tap_fd, &vp, vp.len + 2)) < 0)
+ if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0)
syslog(LOG_ERR, "Can't write to tap device: %m");
else
total_tap_out += lenin;
-
+cp
return 0;
}
*/
void add_queue(packet_queue_t **q, void *packet, size_t s)
{
- queue_element_t *e, *p;
-
+ queue_element_t *e;
+cp
if(debug_lvl > 3)
syslog(LOG_DEBUG, "packet to queue: %d", s);
- e = xmalloc(sizeof(queue_element_t));
+ e = xmalloc(sizeof(*e));
e->packet = xmalloc(s);
memcpy(e->packet, packet, s);
+
if(!*q)
{
- *q = xmalloc(sizeof(packet_queue_t));
+ *q = xmalloc(sizeof(**q));
(*q)->head = (*q)->tail = NULL;
}
- e->next = NULL;
+ e->next = NULL; /* We insert at the tail */
- if((*q)->tail != NULL)
- (*q)->tail->next = e;
+ if((*q)->tail) /* Do we have a tail? */
+ {
+ (*q)->tail->next = e;
+ e->prev = (*q)->tail;
+ }
+ else /* No tail -> no head too */
+ {
+ (*q)->head = e;
+ e->prev = NULL;
+ }
(*q)->tail = e;
+cp
+}
- if((*q)->head == NULL)
- (*q)->head = e;
+/* Remove a queue element */
+void del_queue(packet_queue_t **q, queue_element_t *e)
+{
+cp
+ free(e->packet);
+
+ if(e->next) /* There is a successor, so we are not tail */
+ {
+ if(e->prev) /* There is a predecessor, so we are not head */
+ {
+ e->next->prev = e->prev;
+ e->prev->next = e->next;
+ }
+ else /* We are head */
+ {
+ e->next->prev = NULL;
+ (*q)->head = e->next;
+ }
+ }
+ else /* We are tail (or all alone!) */
+ {
+ if(e->prev) /* We are not alone :) */
+ {
+ e->prev->next = NULL;
+ (*q)->tail = e->prev;
+ }
+ else /* Adieu */
+ {
+ free(*q);
+ *q = NULL;
+ }
+ }
+
+ free(e);
+cp
}
/*
each packet, and removing it when that
returned a zero exit code
*/
-void flush_queue(conn_list_t *cl, packet_queue_t *pq,
+void flush_queue(conn_list_t *cl, packet_queue_t **pq,
int (*function)(conn_list_t*,void*))
{
- queue_element_t *p, *prev = NULL, *next = NULL;
-
- for(p = pq->head; p != NULL; )
+ queue_element_t *p, *next = NULL;
+cp
+ for(p = (*pq)->head; p != NULL; )
{
next = p->next;
-cp
if(!function(cl, p->packet))
- {
- if(prev)
- prev->next = next;
- else
- pq->head = next;
-
-cp
- free(p->packet);
-cp
- free(p);
-cp
- }
- else
- prev = p;
-cp
-
+ del_queue(pq, p);
+
p = next;
}
if(debug_lvl > 3)
syslog(LOG_DEBUG, "queue flushed");
+cp
}
/*
if(debug_lvl > 1)
syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S,
IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, cl->sq, xsend);
+ flush_queue(cl, &(cl->sq), xsend);
}
-cp
if(cl->rq)
{
if(debug_lvl > 1)
syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S,
IP_ADDR_V(cl->vpn_ip));
- flush_queue(cl, cl->rq, xrecv);
+ flush_queue(cl, &(cl->rq), xrecv);
}
cp
}
int send_packet(ip_t to, vpn_packet_t *packet)
{
conn_list_t *cl;
-
+cp
if((cl = lookup_conn(to)) == NULL)
{
if(debug_lvl > 2)
}
for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
if(!cl)
- {
- syslog(LOG_ERR, "zxnrbl");
+ { /* No open outgoing connection has been found. */
+ if(debug_lvl > 2)
+ syslog(LOG_NOTICE, "There is no remote host I can send this packet to.");
return -1;
}
}
-cp
if(my_key_expiry <= time(NULL))
regenerate_keys();
-cp
if(!cl->status.dataopen)
if(setup_vpn_connection(cl) < 0)
return -1;
-cp
if(!cl->status.validkey)
{
add_queue(&(cl->sq), packet, packet->len + 2);
if(!cl->status.waitingforkey)
- send_key_request(to);
+ send_key_request(cl->vpn_ip); /* Keys should be sent to the host running the tincd */
return 0;
}
-cp
if(!cl->status.active)
{
add_queue(&(cl->sq), packet, packet->len + 2);
int send_broadcast(conn_list_t *cl, vpn_packet_t *packet)
{
conn_list_t *p;
-
+cp
for(p = cl; p != NULL; p = p->next)
if(send_packet(p->real_ip, packet) < 0)
{
p->vpn_ip, p->real_ip);
break; /* FIXME: should retry later, and send a ping over the metaconnection. */
}
-
+cp
return 0;
}
int nfd;
const char *tapfname;
config_t const *cfg;
-
+cp
if((cfg = get_config_val(tapdevice)) == NULL)
tapfname = "/dev/tap0";
else
}
tap_fd = nfd;
+cp
return 0;
}
int nfd, flags;
struct sockaddr_in a;
const int one = 1;
-
+cp
if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
syslog(LOG_ERR, "Creating metasocket failed: %m");
syslog(LOG_ERR, "listen: %m");
return -1;
}
-
+cp
return nfd;
}
int nfd, flags;
struct sockaddr_in a;
const int one = 1;
-
+cp
if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
syslog(LOG_ERR, "Creating socket failed: %m");
syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port);
return -1;
}
-
+cp
return nfd;
}
int flags;
struct sockaddr_in a;
config_t const *cfg;
-
+cp
if((cfg = get_config_val(upstreamport)) == NULL)
cl->port = 655;
else
cl->hostname = hostlookup(htonl(cl->real_ip));
syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port);
-
+cp
return 0;
}
int setup_outgoing_connection(ip_t ip)
{
conn_list_t *ncn;
-
+cp
ncn = new_conn_list();
ncn->real_ip = ip;
ncn->status.outgoing = 1;
ncn->next = conn_list;
conn_list = ncn;
-
+cp
return 0;
}
int setup_myself(void)
{
config_t const *cfg;
-
+cp
myself = new_conn_list();
if(!(cfg = get_config_val(myvpnip)))
myself->status.active = 1;
syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port);
-
+cp
return 0;
}
int setup_network_connections(void)
{
config_t const *cfg;
-
+cp
if((cfg = get_config_val(pingtimeout)) == NULL)
timeout = 10;
else
if(setup_outgoing_connection(cfg->data.ip->ip))
return -1;
-
+cp
return 0;
}
{
config_t const *cfg;
static int seconds_till_retry;
-
+cp
cfg = get_config_val(upstreamip);
if(!setup_outgoing_connection(cfg->data.ip->ip))
syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.",
seconds_till_retry);
}
+cp
}
/*
void close_network_connections(void)
{
conn_list_t *p;
-
+cp
for(p = conn_list; p != NULL; p = p->next)
{
if(p->status.dataopen)
destroy_conn_list();
syslog(LOG_NOTICE, "Terminating.");
+cp
return;
}
{
int nfd, flags;
struct sockaddr_in a;
-
+cp
if(debug_lvl > 1)
syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip));
cl->socket = nfd;
cl->status.dataopen = 1;
-
+cp
return 0;
}
conn_list_t *p;
struct sockaddr_in ci;
int len = sizeof(ci);
-
+cp
p = new_conn_list();
if(getpeername(sfd, &ci, &len) < 0)
p->real_ip = ntohl(ci.sin_addr.s_addr);
p->meta_socket = sfd;
p->status.meta = 1;
-
+ p->buflen = 0;
+
syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
if(send_basic_info(p) < 0)
free(p);
return NULL;
}
-
+cp
return p;
}
void build_fdset(fd_set *fs)
{
conn_list_t *p;
-
+cp
FD_ZERO(fs);
for(p = conn_list; p != NULL; p = p->next)
FD_SET(myself->meta_socket, fs);
FD_SET(myself->socket, fs);
FD_SET(tap_fd, fs);
+cp
}
/*
int lenin;
int x, l = sizeof(x);
conn_list_t *f;
-
+cp
if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->socket);
if(rp.len >= 0)
{
f = lookup_conn(rp.from);
- if(debug_lvl > 2)
+ if(debug_lvl > 3)
syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)",
IP_ADDR_V(rp.from), rp.len);
if(!f)
if(my_key_expiry <= time(NULL))
regenerate_keys();
}
-
+cp
return 0;
}
*/
void terminate_connection(conn_list_t *cl)
{
+cp
if(cl->status.remove)
return;
}
cl->status.remove = 1;
+cp
}
/*
int send_broadcast_ping(void)
{
conn_list_t *p;
-
+cp
for(p = conn_list; p != NULL; p = p->next)
{
if(p->status.remove)
}
last_ping_time = time(NULL);
-
+cp
return 0;
}
int check_dead_connections(void)
{
conn_list_t *p;
-
+cp
for(p = conn_list; p != NULL; p = p->next)
{
if(p->status.remove)
terminate_connection(p);
}
}
-
+cp
return 0;
}
{
conn_list_t *ncn;
struct sockaddr client;
- int nfd, len = sizeof(struct sockaddr);
-
+ int nfd, len = sizeof(client);
+cp
if((nfd = accept(cl->meta_socket, &client, &len)) < 0)
{
syslog(LOG_ERR, "Accepting a new connection failed: %m");
ncn->status.meta = 1;
ncn->next = conn_list;
conn_list = ncn;
-
+cp
return 0;
}
*/
int handle_incoming_meta_data(conn_list_t *cl)
{
- int x, l = sizeof(x), lenin;
- unsigned char tmp[1600];
- int request;
-
+ int x, l = sizeof(x);
+ int request, oldlen, p, i;
+ int lenin = 0;
+cp
if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
syslog(LOG_ERR, "This is a bug: %s:%d: %d:%m", __FILE__, __LINE__, cl->meta_socket);
return -1;
}
- if((lenin = recv(cl->meta_socket, &tmp, sizeof(tmp), 0)) <= 0)
+ if(cl->buflen >= MAXBUFSIZE)
{
- syslog(LOG_ERR, "Receive failed: %m");
+ syslog(LOG_ERR, "Metadata read buffer full! Discarding contents.");
+ cl->buflen = 0;
+ }
+
+ lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
+
+ if(lenin<=0)
+ {
+ syslog(LOG_ERR, "Metadata socket read error: %m");
return -1;
}
- request = (int)(tmp[0]);
+ oldlen = cl->buflen;
+ cl->buflen += lenin;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "got request %d", request);
+ for(;;)
+ {
+ cl->reqlen = 0;
- if(request_handlers[request] == NULL)
- syslog(LOG_ERR, "Unknown request %d.", request);
- else
- if(request_handlers[request](cl, tmp, lenin) < 0)
- return -1;
-
+ for(i = oldlen; i < cl->buflen; i++)
+ {
+ if(cl->buffer[i] == '\n')
+ {
+ cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
+ cl->reqlen = i + 1;
+ break;
+ }
+ }
+
+ if(cl->reqlen)
+ {
+ if(sscanf(cl->buffer, "%d", &request) == 1)
+ {
+ if(request_handlers[request] == NULL)
+ {
+ syslog(LOG_ERR, "Unknown request: %s", cl->buffer);
+ return 0;
+ }
+
+ if(debug_lvl > 3)
+ syslog(LOG_DEBUG, "Got request: %s", cl->buffer);
+
+ request_handlers[request](cl);
+ }
+ else
+ {
+ syslog(LOG_ERR, "Bogus data received: %s", cl->buffer);
+ }
+
+ cl->buflen -= cl->reqlen;
+ memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
+ oldlen = 0;
+ }
+ else
+ {
+ break;
+ }
+ }
+cp
return 0;
}
{
conn_list_t *p;
int x, l = sizeof(x);
-
+cp
for(p = conn_list; p != NULL; p = p->next)
{
if(p->status.remove)
continue;
-cp
- if(p->status.active)
+
+ if(p->status.dataopen)
if(FD_ISSET(p->socket, f))
{
/*
terminate_connection(p);
return;
}
-cp
+
if(p->status.meta)
if(FD_ISSET(p->meta_socket, f))
if(handle_incoming_meta_data(p) < 0)
terminate_connection(p);
return;
}
-cp
}
-cp
if(FD_ISSET(myself->socket, f))
handle_incoming_vpn_data(myself);
-cp
+
if(FD_ISSET(myself->meta_socket, f))
handle_new_meta_connection(myself);
cp
vpn_packet_t vp;
ip_t from, to;
int ether_type, lenin;
-
+cp
memset(&vp, 0, sizeof(vp));
if((lenin = read(tap_fd, &vp, MTU)) <= 0)
{
from = ntohl(*((unsigned long*)(&vp.data[26])));
to = ntohl(*((unsigned long*)(&vp.data[30])));
- if(debug_lvl > 2)
+ if(debug_lvl > 3)
syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S,
ether_type, IP_ADDR_V(to), IP_ADDR_V(from));
- if(debug_lvl > 3)
+ if(debug_lvl > 4)
syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S,
MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6]));
vp.len = (length_t)lenin - 2;
-cp
+
strip_mac_addresses(&vp);
-cp
+
send_packet(to, &vp);
cp
}
/*
- this is where it al happens...
+ this is where it all happens...
*/
void main_loop(void)
{
fd_set fset;
struct timeval tv;
int r;
-
+cp
last_ping_time = time(NULL);
for(;;)
tv.tv_sec = timeout;
tv.tv_usec = 0;
-cp
prune_conn_list();
-cp
build_fdset(&fset);
-cp
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
{
syslog(LOG_ERR, "Error while waiting for input: %m");
return;
}
-cp
if(r == 0 || last_ping_time + timeout < time(NULL))
/* Timeout... hm... something might be wrong. */
continue;
}
-cp
check_network_activity(&fset);
-cp
/* local tap data */
if(FD_ISSET(tap_fd, &fset))
handle_tap_input();
-cp
}
+cp
}
projects / tinc / blobdiff