/*
net.c -- most of the network code
- Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
+ Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
real_packet_t rp;
cp
do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
- rp.from = myself->vpn_ip;
+ rp.from = htonl(myself->vpn_ip);
+ rp.data.len = htons(rp.data.len);
+ rp.len = htons(rp.len);
if(debug_lvl > 3)
- syslog(LOG_ERR, "Sent %d bytes to %lx", rp.len, cl->vpn_ip);
+ syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip);
- if((r = send(cl->socket, (char*)&rp, rp.len, 0)) < 0)
+ if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
{
syslog(LOG_ERR, "Error sending data: %m");
return -1;
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;
-cp
- do
- {
- if((r = write(fd, buf, len)) < 0)
- return -1;
- len -= r;
- buf += r;
- done += r;
- } while(len > 0);
-
- return done;
-cp
-}
-
int xrecv(conn_list_t *cl, void *packet)
{
vpn_packet_t vp;
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;
*/
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;
+ queue_element_t *p, *next = NULL;
cp
- for(p = pq->head; p != NULL; )
+ for(p = (*pq)->head; p != NULL; )
{
next = p->next;
if(!function(cl, p->packet))
- {
- if(prev)
- prev->next = next;
- else
- pq->head = next;
-
- free(p->packet);
- free(p);
- }
- else
- prev = p;
-
+ del_queue(pq, p);
+
p = next;
}
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);
}
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
}
{
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;
}
return xsend(cl, packet);
}
-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)
- {
- syslog(LOG_ERR, "Could not send a broadcast packet to %08lx (%08lx): %m",
- p->vpn_ip, p->real_ip);
- break; /* FIXME: should retry later, and send a ping over the metaconnection. */
- }
-cp
- return 0;
-}
-
/*
open the local ethertap device
*/
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)
return -1;
}
total_socket_in += lenin;
+
+ rp.data.len = ntohs(rp.data.len);
+ rp.len = ntohs(rp.len);
+ rp.from = ntohl(rp.from);
+
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)
{
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)
{
*/
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, i;
+ int lenin = 0;
cp
if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
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;
}
if(p->status.remove)
continue;
- if(p->status.active)
+ if(p->status.dataopen)
if(FD_ISSET(p->socket, f))
{
/*
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]));
}
/*
- this is where it al happens...
+ this is where it all happens...
*/
void main_loop(void)
{
projects / tinc / blobdiff