#include <stdio.h>
#include <string.h>
#include <limits.h>
+#include <assert.h>
#include <sys/socket.h>
#include <sys/mman.h>
struct dh_if *dh;
struct hash_if *hash;
- uint32_t setup_retries; /* How many times to send setup packets */
- uint32_t setup_timeout; /* Initial timeout for setup packets */
- uint32_t wait_timeout; /* How long to wait if setup unsuccessful */
- uint32_t key_lifetime; /* How long a key lasts once set up */
- uint32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
+ uint32_t index; /* Index of this site */
+ int32_t setup_retries; /* How many times to send setup packets */
+ int32_t setup_timeout; /* Initial timeout for setup packets */
+ int32_t wait_timeout; /* How long to wait if setup unsuccessful */
+ int32_t key_lifetime; /* How long a key lasts once set up */
+ int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
after this time, initiate a new
key exchange */
- bool_t keepalive; /* Send keepalives to detect peer failure (not yet
- implemented) */
uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
- uint32_t setupsiglen; /* Allows us to discard packets quickly if
- they are not for us */
+ int32_t setupsiglen; /* Allows us to discard packets quickly if
+ they are not for us */
bool_t setup_priority; /* Do we have precedence if both sites emit
message 1 simultaneously? */
uint32_t log_events;
bool_t current_valid;
uint64_t current_key_timeout; /* End of life of current key */
uint64_t renegotiate_key_time; /* When we can negotiate a new key */
- struct sockaddr_in peer; /* Current address of peer */
+ struct comm_addr peer; /* Current address of peer */
bool_t peer_valid; /* Peer address becomes invalid when key times out,
but only if we have a DNS name for our peer */
timeout before we can listen for another setup packet); perhaps
we should keep a list of 'bad' sources for setup packets. */
uint32_t setup_session_id;
- struct sockaddr_in setup_peer;
+ struct comm_addr setup_peer;
uint8_t localN[NONCELEN]; /* Nonces for key exchange */
uint8_t remoteN[NONCELEN];
struct buffer_if buffer; /* Current outgoing key exchange packet */
- uint32_t retries; /* Number of retries remaining */
+ int32_t retries; /* Number of retries remaining */
uint64_t timeout; /* Timeout for current state */
uint8_t *dhsecret;
uint8_t *sharedsecret;
default: class=M_ERR; break;
}
- vsnprintf(buf,240,msg,ap);
+ vsnprintf(buf,sizeof(buf),msg,ap);
st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
}
va_end(ap);
uint8_t *hashstart;
uint32_t dest;
uint32_t source;
- uint32_t remlen;
+ int32_t remlen;
uint8_t *remote;
- uint32_t loclen;
+ int32_t loclen;
uint8_t *local;
uint8_t *nR;
uint8_t *nL;
- uint32_t pklen;
- uint8_t *pk;
- uint32_t hashlen;
- uint32_t siglen;
- uint8_t *sig;
+ int32_t pklen;
+ char *pk;
+ int32_t hashlen;
+ int32_t siglen;
+ char *sig;
};
/* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
buffer_init(&st->buffer,0);
buf_append_uint32(&st->buffer,
(type==LABEL_MSG1?0:st->setup_session_id));
- buf_append_uint32(&st->buffer,(uint32_t)st);
+ buf_append_uint32(&st->buffer,st->index);
buf_append_uint32(&st->buffer,type);
buf_append_string(&st->buffer,st->localname);
buf_append_string(&st->buffer,st->remotename);
}
static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
}
static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
cstring_t err;
}
static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
uint8_t *hash;
}
static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
uint8_t *hash;
st->new_transform->forwards(st->new_transform->st,&st->buffer,
&transform_err);
buf_prepend_uint32(&st->buffer,LABEL_MSG5);
- buf_prepend_uint32(&st->buffer,(uint32_t)st);
+ buf_prepend_uint32(&st->buffer,st->index);
buf_prepend_uint32(&st->buffer,st->setup_session_id);
st->retries=st->setup_retries;
}
static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg0 m;
cstring_t transform_err;
st->new_transform->forwards(st->new_transform->st,&st->buffer,
&transform_err);
buf_prepend_uint32(&st->buffer,LABEL_MSG6);
- buf_prepend_uint32(&st->buffer,(uint32_t)st);
+ buf_prepend_uint32(&st->buffer,st->index);
buf_prepend_uint32(&st->buffer,st->setup_session_id);
st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
}
static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg0 m;
cstring_t transform_err;
}
static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg0 m;
cstring_t transform_err;
/* We must forget about the current session. */
delete_key(st,"request from peer",LOG_SEC);
return True;
- break;
case LABEL_MSG9:
/* Deliver to netlink layer */
st->netlink->deliver(st->netlink->st,msg0);
return True;
- break;
default:
slog(st,LOG_SEC,"incoming encrypted message of type %08x "
"(unknown)",type);
}
static void dump_packet(struct site *st, struct buffer_if *buf,
- struct sockaddr_in *addr, bool_t incoming)
+ const struct comm_addr *addr, bool_t incoming)
{
uint32_t dest=ntohl(*(uint32_t *)buf->start);
uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
}
if (address) {
memset(&st->setup_peer,0,sizeof(st->setup_peer));
- st->setup_peer.sin_family=AF_INET;
- st->setup_peer.sin_port=htons(st->remoteport);
- st->setup_peer.sin_addr=*address;
+ st->setup_peer.comm=st->comm;
+ st->setup_peer.sin.sin_family=AF_INET;
+ st->setup_peer.sin.sin_port=htons(st->remoteport);
+ st->setup_peer.sin.sin_addr=*address;
enter_new_state(st,SITE_SENTMSG1);
} else {
/* Resolution failed */
st->current_transform->forwards(st->current_transform->st,
&st->buffer, &transform_err);
buf_prepend_uint32(&st->buffer,LABEL_MSG0);
- buf_prepend_uint32(&st->buffer,(uint32_t)st);
+ buf_prepend_uint32(&st->buffer,st->index);
buf_prepend_uint32(&st->buffer,st->remote_session_id);
+ dump_packet(st,&st->buffer,&st->peer,False);
st->comm->sendmsg(st->comm->st,&st->buffer,&st->peer);
BUF_FREE(&st->buffer);
return True;
slog(st,LOG_STATE,"entering state WAIT");
st->timeout=st->now+st->wait_timeout;
st->state=SITE_WAIT;
- st->peer_valid=False;
set_link_quality(st);
BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
/* XXX Erase keys etc. */
}
-static inline void site_settimeout(uint64_t timeout, uint64_t *now,
- int *timeout_io)
+static inline void site_settimeout(uint64_t timeout, int *timeout_io)
{
if (timeout) {
- uint64_t offset=timeout-*now;
+ int64_t offset=timeout-*now;
+ if (offset<0) offset=0;
if (offset>INT_MAX) offset=INT_MAX;
if (*timeout_io<0 || offset<*timeout_io)
*timeout_io=offset;
}
static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
- int *timeout_io, const struct timeval *tv_now,
- uint64_t *now)
+ int *timeout_io)
{
struct site *st=sst;
/* Work out when our next timeout is. The earlier of 'timeout' or
'current_key_timeout'. A stored value of '0' indicates no timeout
active. */
- site_settimeout(st->timeout, now, timeout_io);
- site_settimeout(st->current_key_timeout, now, timeout_io);
+ site_settimeout(st->timeout, timeout_io);
+ site_settimeout(st->current_key_timeout, timeout_io);
return 0; /* success */
}
/* NB site_afterpoll will be called before site_beforepoll is ever called */
-static void site_afterpoll(void *sst, struct pollfd *fds, int nfds,
- const struct timeval *tv_now, uint64_t *now)
+static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
{
struct site *st=sst;
st->current_transform->forwards(st->current_transform->st,
buf, &transform_err);
buf_prepend_uint32(buf,LABEL_MSG0);
- buf_prepend_uint32(buf,(uint32_t)st);
+ buf_prepend_uint32(buf,st->index);
buf_prepend_uint32(buf,st->remote_session_id);
st->comm->sendmsg(st->comm->st,buf,&st->peer);
}
/* This function is called by the communication device to deliver
packets from our peers. */
static bool_t site_incoming(void *sst, struct buffer_if *buf,
- struct sockaddr_in *source)
+ const struct comm_addr *source)
{
struct site *st=sst;
uint32_t dest=ntohl(*(uint32_t *)buf->start);
}
return False; /* Not for us. */
}
- if (dest==(uint32_t)st) {
+ if (dest==st->index) {
/* Explicitly addressed to us */
uint32_t msgtype=ntohl(get_uint32(buf->start+8));
if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
list_t *args)
{
+ static uint32_t index_sequence;
struct site *st;
item_t *item;
dict_t *dict;
free(st);
return NULL;
}
+ assert(index_sequence < 0xffffffffUL);
+ st->index = ++index_sequence;
st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc);
st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
st->key_lifetime=dict_read_number(
dict,"key-lifetime",False,"site",loc,DEFAULT_KEY_LIFETIME);
- if (st->key_lifetime < DEFAULT_KEY_RENEGOTIATE_GAP)
- st->key_renegotiate_time=st->key_lifetime/2;
- else
- st->key_renegotiate_time=st->key_lifetime-DEFAULT_KEY_RENEGOTIATE_GAP;
st->setup_retries=dict_read_number(
dict,"setup-retries",False,"site",loc,DEFAULT_SETUP_RETRIES);
st->setup_timeout=dict_read_number(
dict,"setup-timeout",False,"site",loc,DEFAULT_SETUP_TIMEOUT);
st->wait_timeout=dict_read_number(
dict,"wait-time",False,"site",loc,DEFAULT_WAIT_TIME);
+
+ if (st->key_lifetime < DEFAULT_KEY_RENEGOTIATE_GAP*2)
+ st->key_renegotiate_time=st->key_lifetime/2;
+ else
+ st->key_renegotiate_time=st->key_lifetime-DEFAULT_KEY_RENEGOTIATE_GAP;
st->key_renegotiate_time=dict_read_number(
- dict,"renegotiate-time",False,"site",loc,st->key_lifetime);
+ dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
if (st->key_renegotiate_time > st->key_lifetime) {
cfgfatal(loc,"site",
"renegotiate-time must be less than key-lifetime\n");
}
- st->keepalive=dict_read_bool(dict,"keepalive",False,"site",loc,False);
st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
log_event_table,"site");
sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
/* The information we expect to see in incoming messages of type 1 */
+ /* fixme: lots of unchecked overflows here, but the results are only
+ corrupted packets rather than undefined behaviour */
st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
put_uint32(st->setupsig+0,LABEL_MSG1);