Switch to K&R style indentation.
This commit is contained in:
Guus Sliepen
parent
5fc1ed17f4
commit
f75dcef72a
44 changed files with 6039 additions and 6132 deletions
536
src/net_packet.c
536
src/net_packet.c
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@ -17,7 +17,7 @@
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: net_packet.c,v 1.1.2.21 2002/09/09 19:39:58 guus Exp $
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$Id: net_packet.c,v 1.1.2.22 2002/09/09 21:24:41 guus Exp $
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*/
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#include "config.h"
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@ -27,13 +27,13 @@
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#include <netdb.h>
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#include <netinet/in.h>
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#ifdef HAVE_NETINET_IN_SYSTM_H
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#include <netinet/in_systm.h>
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#include <netinet/in_systm.h>
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#endif
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#ifdef HAVE_NETINET_IP_H
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#include <netinet/ip.h>
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#include <netinet/ip.h>
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#endif
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#include <netinet/tcp.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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@ -85,349 +85,353 @@ int keyexpires = 0;
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/* VPN packet I/O */
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void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
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void receive_udppacket(node_t * n, vpn_packet_t * inpkt)
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{
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vpn_packet_t pkt1, pkt2;
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vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2};
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int nextpkt = 0;
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vpn_packet_t *outpkt = pkt[0];
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int outlen, outpad;
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long int complen = MTU + 12;
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EVP_CIPHER_CTX ctx;
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char hmac[EVP_MAX_MD_SIZE];
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cp();
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/* Check the message authentication code */
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vpn_packet_t pkt1, pkt2;
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vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
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int nextpkt = 0;
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vpn_packet_t *outpkt = pkt[0];
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int outlen, outpad;
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long int complen = MTU + 12;
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EVP_CIPHER_CTX ctx;
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char hmac[EVP_MAX_MD_SIZE];
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if(myself->digest && myself->maclength)
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{
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inpkt->len -= myself->maclength;
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HMAC(myself->digest, myself->key, myself->keylength, (char *)&inpkt->seqno, inpkt->len, hmac, NULL);
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if(memcmp(hmac, (char *)&inpkt->seqno + inpkt->len, myself->maclength))
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{
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"), n->name, n->hostname);
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return;
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}
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}
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cp();
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/* Decrypt the packet */
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/* Check the message authentication code */
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if(myself->cipher)
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{
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outpkt = pkt[nextpkt++];
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if(myself->digest && myself->maclength) {
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inpkt->len -= myself->maclength;
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HMAC(myself->digest, myself->key, myself->keylength,
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(char *) &inpkt->seqno, inpkt->len, hmac, NULL);
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EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
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EVP_DecryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
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EVP_DecryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad);
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if(memcmp(hmac, (char *) &inpkt->seqno + inpkt->len, myself->maclength)) {
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Got unauthenticated packet from %s (%s)"),
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n->name, n->hostname);
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return;
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}
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}
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outpkt->len = outlen + outpad;
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inpkt = outpkt;
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}
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/* Decrypt the packet */
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/* Check the sequence number */
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if(myself->cipher) {
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outpkt = pkt[nextpkt++];
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inpkt->len -= sizeof(inpkt->seqno);
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inpkt->seqno = ntohl(inpkt->seqno);
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EVP_DecryptInit(&ctx, myself->cipher, myself->key,
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myself->key + myself->cipher->key_len);
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EVP_DecryptUpdate(&ctx, (char *) &outpkt->seqno, &outlen,
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(char *) &inpkt->seqno, inpkt->len);
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EVP_DecryptFinal(&ctx, (char *) &outpkt->seqno + outlen, &outpad);
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if(inpkt->seqno <= n->received_seqno)
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{
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Got late or replayed packet from %s (%s), seqno %d"), n->name, n->hostname, inpkt->seqno);
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return;
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}
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n->received_seqno = inpkt->seqno;
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outpkt->len = outlen + outpad;
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inpkt = outpkt;
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}
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if(n->received_seqno > MAX_SEQNO)
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keyexpires = 0;
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/* Check the sequence number */
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/* Decompress the packet */
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if(myself->compression)
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{
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outpkt = pkt[nextpkt++];
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inpkt->len -= sizeof(inpkt->seqno);
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inpkt->seqno = ntohl(inpkt->seqno);
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if(uncompress(outpkt->data, &complen, inpkt->data, inpkt->len) != Z_OK)
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{
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syslog(LOG_ERR, _("Error while uncompressing packet from %s (%s)"), n->name, n->hostname);
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return;
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}
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outpkt->len = complen;
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inpkt = outpkt;
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}
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if(inpkt->seqno <= n->received_seqno) {
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG,
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_("Got late or replayed packet from %s (%s), seqno %d"),
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n->name, n->hostname, inpkt->seqno);
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return;
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}
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receive_packet(n, inpkt);
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cp();
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n->received_seqno = inpkt->seqno;
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if(n->received_seqno > MAX_SEQNO)
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keyexpires = 0;
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/* Decompress the packet */
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if(myself->compression) {
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outpkt = pkt[nextpkt++];
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if(uncompress(outpkt->data, &complen, inpkt->data, inpkt->len) != Z_OK) {
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syslog(LOG_ERR, _("Error while uncompressing packet from %s (%s)"),
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n->name, n->hostname);
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return;
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}
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outpkt->len = complen;
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inpkt = outpkt;
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}
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receive_packet(n, inpkt);
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}
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void receive_tcppacket(connection_t *c, char *buffer, int len)
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void receive_tcppacket(connection_t * c, char *buffer, int len)
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{
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vpn_packet_t outpkt;
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cp();
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outpkt.len = len;
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memcpy(outpkt.data, buffer, len);
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vpn_packet_t outpkt;
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receive_packet(c->node, &outpkt);
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cp();
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cp();
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outpkt.len = len;
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memcpy(outpkt.data, buffer, len);
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receive_packet(c->node, &outpkt);
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}
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void receive_packet(node_t *n, vpn_packet_t *packet)
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void receive_packet(node_t * n, vpn_packet_t * packet)
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{
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cp();
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
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cp();
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route_incoming(n, packet);
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cp();
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"),
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packet->len, n->name, n->hostname);
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route_incoming(n, packet);
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}
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void send_udppacket(node_t *n, vpn_packet_t *inpkt)
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void send_udppacket(node_t * n, vpn_packet_t * inpkt)
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{
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vpn_packet_t pkt1, pkt2;
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vpn_packet_t *pkt[] = {&pkt1, &pkt2, &pkt1, &pkt2};
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int nextpkt = 0;
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vpn_packet_t *outpkt;
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int origlen;
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int outlen, outpad;
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long int complen = MTU + 12;
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EVP_CIPHER_CTX ctx;
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vpn_packet_t *copy;
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static int priority = 0;
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int origpriority;
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int sock;
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cp();
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/* Make sure we have a valid key */
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vpn_packet_t pkt1, pkt2;
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vpn_packet_t *pkt[] = { &pkt1, &pkt2, &pkt1, &pkt2 };
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int nextpkt = 0;
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vpn_packet_t *outpkt;
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int origlen;
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int outlen, outpad;
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long int complen = MTU + 12;
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EVP_CIPHER_CTX ctx;
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vpn_packet_t *copy;
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static int priority = 0;
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int origpriority;
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int sock;
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if(!n->status.validkey)
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{
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"),
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n->name, n->hostname);
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cp();
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/* Since packet is on the stack of handle_tap_input(),
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we have to make a copy of it first. */
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/* Make sure we have a valid key */
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copy = xmalloc(sizeof(vpn_packet_t));
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memcpy(copy, inpkt, sizeof(vpn_packet_t));
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if(!n->status.validkey) {
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_INFO,
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_("No valid key known yet for %s (%s), queueing packet"),
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n->name, n->hostname);
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list_insert_tail(n->queue, copy);
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/* Since packet is on the stack of handle_tap_input(), we have to make a copy of it first. */
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if(n->queue->count > MAXQUEUELENGTH)
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list_delete_head(n->queue);
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copy = xmalloc(sizeof(vpn_packet_t));
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memcpy(copy, inpkt, sizeof(vpn_packet_t));
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if(!n->status.waitingforkey)
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send_req_key(n->nexthop->connection, myself, n);
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list_insert_tail(n->queue, copy);
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n->status.waitingforkey = 1;
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if(n->queue->count > MAXQUEUELENGTH)
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list_delete_head(n->queue);
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return;
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}
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if(!n->status.waitingforkey)
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send_req_key(n->nexthop->connection, myself, n);
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origlen = inpkt->len;
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origpriority = inpkt->priority;
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n->status.waitingforkey = 1;
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/* Compress the packet */
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return;
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}
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if(n->compression)
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{
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outpkt = pkt[nextpkt++];
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origlen = inpkt->len;
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origpriority = inpkt->priority;
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if(compress2(outpkt->data, &complen, inpkt->data, inpkt->len, n->compression) != Z_OK)
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{
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syslog(LOG_ERR, _("Error while compressing packet to %s (%s)"), n->name, n->hostname);
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return;
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}
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outpkt->len = complen;
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inpkt = outpkt;
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}
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/* Compress the packet */
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/* Add sequence number */
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if(n->compression) {
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outpkt = pkt[nextpkt++];
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inpkt->seqno = htonl(++(n->sent_seqno));
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inpkt->len += sizeof(inpkt->seqno);
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if(compress2
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(outpkt->data, &complen, inpkt->data, inpkt->len,
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n->compression) != Z_OK) {
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syslog(LOG_ERR, _("Error while compressing packet to %s (%s)"),
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n->name, n->hostname);
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return;
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}
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/* Encrypt the packet */
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outpkt->len = complen;
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inpkt = outpkt;
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}
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if(n->cipher)
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{
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outpkt = pkt[nextpkt++];
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/* Add sequence number */
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EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
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EVP_EncryptUpdate(&ctx, (char *)&outpkt->seqno, &outlen, (char *)&inpkt->seqno, inpkt->len);
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EVP_EncryptFinal(&ctx, (char *)&outpkt->seqno + outlen, &outpad);
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inpkt->seqno = htonl(++(n->sent_seqno));
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inpkt->len += sizeof(inpkt->seqno);
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outpkt->len = outlen + outpad;
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inpkt = outpkt;
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}
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/* Encrypt the packet */
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/* Add the message authentication code */
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if(n->cipher) {
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outpkt = pkt[nextpkt++];
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if(n->digest && n->maclength)
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{
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HMAC(n->digest, n->key, n->keylength, (char *)&inpkt->seqno, inpkt->len, (char *)&inpkt->seqno + inpkt->len, &outlen);
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inpkt->len += n->maclength;
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}
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EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
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EVP_EncryptUpdate(&ctx, (char *) &outpkt->seqno, &outlen,
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(char *) &inpkt->seqno, inpkt->len);
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EVP_EncryptFinal(&ctx, (char *) &outpkt->seqno + outlen, &outpad);
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/* Determine which socket we have to use */
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outpkt->len = outlen + outpad;
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inpkt = outpkt;
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}
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for(sock = 0; sock < listen_sockets; sock++)
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if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family)
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break;
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/* Add the message authentication code */
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if(sock >= listen_sockets)
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sock = 0; /* If none is available, just use the first and hope for the best. */
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/* Send the packet */
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if(n->digest && n->maclength) {
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HMAC(n->digest, n->key, n->keylength, (char *) &inpkt->seqno,
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inpkt->len, (char *) &inpkt->seqno + inpkt->len, &outlen);
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inpkt->len += n->maclength;
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}
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/* Determine which socket we have to use */
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for(sock = 0; sock < listen_sockets; sock++)
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if(n->address.sa.sa_family == listen_socket[sock].sa.sa.sa_family)
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break;
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if(sock >= listen_sockets)
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sock = 0; /* If none is available, just use the first and hope for the best. */
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/* Send the packet */
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#if defined(SOL_IP) && defined(IP_TOS)
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if(priorityinheritance && origpriority != priority && listen_socket[sock].sa.sa.sa_family == AF_INET)
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{
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priority = origpriority;
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Setting outgoing packet priority to %d"), priority);
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if(setsockopt(sock, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
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syslog(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt", strerror(errno));
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}
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if(priorityinheritance && origpriority != priority
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&& listen_socket[sock].sa.sa.sa_family == AF_INET) {
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priority = origpriority;
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Setting outgoing packet priority to %d"),
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priority);
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if(setsockopt(sock, SOL_IP, IP_TOS, &priority, sizeof(priority))) /* SO_PRIORITY doesn't seem to work */
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syslog(LOG_ERR, _("System call `%s' failed: %s"), "setsockopt",
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strerror(errno));
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}
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#endif
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if((sendto(listen_socket[sock].udp, (char *)&inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0)
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{
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syslog(LOG_ERR, _("Error sending packet to %s (%s): %s"),
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n->name, n->hostname, strerror(errno));
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return;
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}
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inpkt->len = origlen;
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cp();
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if((sendto(listen_socket[sock].udp, (char *) &inpkt->seqno, inpkt->len, 0, &(n->address.sa), SALEN(n->address.sa))) < 0) {
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syslog(LOG_ERR, _("Error sending packet to %s (%s): %s"), n->name,
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n->hostname, strerror(errno));
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return;
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}
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inpkt->len = origlen;
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}
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/*
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send a packet to the given vpn ip.
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*/
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void send_packet(node_t *n, vpn_packet_t *packet)
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void send_packet(node_t * n, vpn_packet_t * packet)
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{
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node_t *via;
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cp();
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
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packet->len, n->name, n->hostname);
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node_t *via;
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if(n == myself)
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{
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if(debug_lvl >= DEBUG_TRAFFIC)
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{
|
||||
syslog(LOG_NOTICE, _("Packet is looping back to us!"));
|
||||
}
|
||||
cp();
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
if(!n->status.reachable)
|
||||
{
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Node %s (%s) is not reachable"),
|
||||
n->name, n->hostname);
|
||||
return;
|
||||
}
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
|
||||
packet->len, n->name, n->hostname);
|
||||
|
||||
via = (n->via == myself)?n->nexthop:n->via;
|
||||
if(n == myself) {
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_NOTICE, _("Packet is looping back to us!"));
|
||||
|
||||
if(via != n && debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
|
||||
n->name, via->name, n->via->hostname);
|
||||
return;
|
||||
}
|
||||
|
||||
if((myself->options | via->options) & OPTION_TCPONLY)
|
||||
{
|
||||
if(send_tcppacket(via->connection, packet))
|
||||
terminate_connection(via->connection, 1);
|
||||
}
|
||||
else
|
||||
send_udppacket(via, packet);
|
||||
if(!n->status.reachable) {
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Node %s (%s) is not reachable"),
|
||||
n->name, n->hostname);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
via = (n->via == myself) ? n->nexthop : n->via;
|
||||
|
||||
if(via != n && debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
|
||||
n->name, via->name, n->via->hostname);
|
||||
|
||||
if((myself->options | via->options) & OPTION_TCPONLY) {
|
||||
if(send_tcppacket(via->connection, packet))
|
||||
terminate_connection(via->connection, 1);
|
||||
} else
|
||||
send_udppacket(via, packet);
|
||||
}
|
||||
|
||||
/* Broadcast a packet using the minimum spanning tree */
|
||||
|
||||
void broadcast_packet(node_t *from, vpn_packet_t *packet)
|
||||
void broadcast_packet(node_t * from, vpn_packet_t * packet)
|
||||
{
|
||||
avl_node_t *node;
|
||||
connection_t *c;
|
||||
cp();
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
|
||||
packet->len, from->name, from->hostname);
|
||||
avl_node_t *node;
|
||||
connection_t *c;
|
||||
|
||||
for(node = connection_tree->head; node; node = node->next)
|
||||
{
|
||||
c = (connection_t *)node->data;
|
||||
if(c->status.active && c->status.mst && c != from->nexthop->connection)
|
||||
send_packet(c->node, packet);
|
||||
}
|
||||
cp();
|
||||
cp();
|
||||
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
|
||||
packet->len, from->name, from->hostname);
|
||||
|
||||
for(node = connection_tree->head; node; node = node->next) {
|
||||
c = (connection_t *) node->data;
|
||||
|
||||
if(c->status.active && c->status.mst && c != from->nexthop->connection)
|
||||
send_packet(c->node, packet);
|
||||
}
|
||||
}
|
||||
|
||||
void flush_queue(node_t *n)
|
||||
void flush_queue(node_t * n)
|
||||
{
|
||||
list_node_t *node, *next;
|
||||
cp();
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
|
||||
list_node_t *node, *next;
|
||||
|
||||
for(node = n->queue->head; node; node = next)
|
||||
{
|
||||
next = node->next;
|
||||
send_udppacket(n, (vpn_packet_t *)node->data);
|
||||
list_delete_node(n->queue, node);
|
||||
}
|
||||
cp();
|
||||
cp();
|
||||
|
||||
if(debug_lvl >= DEBUG_TRAFFIC)
|
||||
syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
|
||||
|
||||
for(node = n->queue->head; node; node = next) {
|
||||
next = node->next;
|
||||
send_udppacket(n, (vpn_packet_t *) node->data);
|
||||
list_delete_node(n->queue, node);
|
||||
}
|
||||
}
|
||||
|
||||
void handle_incoming_vpn_data(int sock)
|
||||
{
|
||||
vpn_packet_t pkt;
|
||||
int x, l = sizeof(x);
|
||||
char *hostname;
|
||||
sockaddr_t from;
|
||||
socklen_t fromlen = sizeof(from);
|
||||
node_t *n;
|
||||
cp();
|
||||
if(getsockopt(sock, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
|
||||
{
|
||||
syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s"),
|
||||
__FILE__, __LINE__, sock, strerror(errno));
|
||||
cp_trace();
|
||||
exit(1);
|
||||
}
|
||||
if(x)
|
||||
{
|
||||
syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
|
||||
return;
|
||||
}
|
||||
vpn_packet_t pkt;
|
||||
int x, l = sizeof(x);
|
||||
char *hostname;
|
||||
sockaddr_t from;
|
||||
socklen_t fromlen = sizeof(from);
|
||||
node_t *n;
|
||||
|
||||
pkt.len = recvfrom(sock, (char *)&pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
|
||||
cp();
|
||||
|
||||
if(pkt.len <= 0)
|
||||
{
|
||||
syslog(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
|
||||
return;
|
||||
}
|
||||
if(getsockopt(sock, SOL_SOCKET, SO_ERROR, &x, &l) < 0) {
|
||||
syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s"),
|
||||
__FILE__, __LINE__, sock, strerror(errno));
|
||||
cp_trace();
|
||||
exit(1);
|
||||
}
|
||||
|
||||
sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
|
||||
if(x) {
|
||||
syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
|
||||
return;
|
||||
}
|
||||
|
||||
n = lookup_node_udp(&from);
|
||||
pkt.len = recvfrom(sock, (char *) &pkt.seqno, MAXSIZE, 0, &from.sa, &fromlen);
|
||||
|
||||
if(!n)
|
||||
{
|
||||
hostname = sockaddr2hostname(&from);
|
||||
syslog(LOG_WARNING, _("Received UDP packet from unknown source %s"), hostname);
|
||||
free(hostname);
|
||||
return;
|
||||
}
|
||||
if(pkt.len <= 0) {
|
||||
syslog(LOG_ERR, _("Receiving packet failed: %s"), strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
if(n->connection)
|
||||
n->connection->last_ping_time = now;
|
||||
sockaddrunmap(&from); /* Some braindead IPv6 implementations do stupid things. */
|
||||
|
||||
receive_udppacket(n, &pkt);
|
||||
cp();
|
||||
n = lookup_node_udp(&from);
|
||||
|
||||
if(!n) {
|
||||
hostname = sockaddr2hostname(&from);
|
||||
syslog(LOG_WARNING, _("Received UDP packet from unknown source %s"),
|
||||
hostname);
|
||||
free(hostname);
|
||||
return;
|
||||
}
|
||||
|
||||
if(n->connection)
|
||||
n->connection->last_ping_time = now;
|
||||
|
||||
receive_udppacket(n, &pkt);
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue