along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.149 2001/11/16 12:22:02 zarq Exp $
+ $Id: net.c,v 1.35.4.150 2001/11/16 17:38:39 zarq Exp $
*/
#include "config.h"
/* VPN packet I/O */
+char *hostlookup(struct sockaddr *addr, int numericonly)
+{
+ char *name;
+ struct hostent *host = NULL;
+ struct in_addr in;
+ config_t const *cfg;
+ int flags = 0;
+
+cp
+ if(numericonly
+ || ((cfg = get_config_val(config, resolve_dns)) == NULL
+ || cfg->data.val != stupid_true))
+ flags |= NI_NUMERICHOST;
+
+ hostname = xmalloc(NI_MAXHOST);
+
+ if((r = getnameinfo(addr, sizeof(*addr), &hostname, NI_MAXHOST, NULL, 0, flags)) != 0)
+ {
+ free(hostname);
+ if(flags & NI_NUMERICHOST)
+ {
+ syslog(LOG_ERR, _("Address conversion failed: %s"),
+ gai_strerror(r));
+ return NULL;
+ }
+ else
+ return hostlookup(addr, 1);
+ }
+cp
+ return hostname;
+}
+
void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
{
vpn_packet_t outpkt;
EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt));
EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad);
outlen += outpad;
-
- to.sin_family = AF_INET;
- to.sin_addr.s_addr = htonl(n->address);
- to.sin_port = htons(n->port);
-
- if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0)
+
+ if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, n->address->ai_addr, n->address->ai_addrlen)) < 0)
{
syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
n->name, n->hostname);
/* Setup sockets */
-int setup_listen_socket(int port)
+int setup_listen_socket(node_t *n)
{
int nfd, flags;
- struct sockaddr_in a;
int option;
char *address;
- ip_mask_t *ipmask;
+ int r;
+ struct addrinfo hints, *ai, *aitop;
+ int ipv6preferred;
#ifdef HAVE_LINUX
char *interface;
#endif
+
cp
- if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
+
+ if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address))
{
- syslog(LOG_ERR, _("Creating metasocket failed: %m"));
- return -1;
+ address = NULL;
}
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = IPPROTO_TCP;
+ hints.ai_family = AF_INET;
+ if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred))
{
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fcntl");
+ if(ipv6preferred)
+ hints.ai_family = PF_UNSPEC;
+ }
+ if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0)
+ {
+ syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"),
+ address, gai_strerror(r));
return -1;
}
- /* Optimize TCP settings */
-
- option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
- setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
+ /* Try to create a listening socket for all alternatives we got from
+ getaddrinfo. */
+ for(ai = aitop; ai != NULL; ai = ai->ai_next)
+ {
+ if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
+ {
+ syslog(LOG_ERR, _("Creating metasocket failed: %m"));
+ continue;
+ }
+
+ flags = fcntl(nfd, F_GETFL);
+ if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
+ continue;
+ }
+
+ /* Optimize TCP settings */
+
+ option = 1;
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+ setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
#ifdef HAVE_LINUX
- setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
-
- option = IPTOS_LOWDELAY;
- setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
-
- if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
- if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
- {
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
- return -1;
- }
+ setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
+
+ option = IPTOS_LOWDELAY;
+ setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
+
+ if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
+ if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
+ continue;
+ }
#endif
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_addr.s_addr = htonl(INADDR_ANY);
- a.sin_port = htons(port);
-
- if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address))
- {
- ipmask = strtoip(address);
- if(ipmask)
- {
- a.sin_addr.s_addr = htonl(ipmask->address);
- free(ipmask);
- }
- }
+ if(bind(nfd, ai->ai_addr, ai->ai_addrlen))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to %s port %d/tcp: %m"),
+ ai->ai_canonname, n->port);
+ continue;
+ }
+
+ if(listen(nfd, 3))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "listen");
+ continue;
+ }
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
- {
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
- return -1;
+ break; /* We have successfully bound to a socket */
}
- if(listen(nfd, 3))
+ if(ai == NULL) /* None of the alternatives succeeded */
{
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "listen");
+ syslog(LOG_ERR, _("Failed to open a listening socket."));
return -1;
}
cp
return nfd;
}
-int setup_vpn_in_socket(int port)
+int setup_vpn_in_socket(node_t *n)
{
- int nfd, flags;
- struct sockaddr_in a;
const int one = 1;
+ int nfd, flags;
+ int option;
+ char *address;
+ int r;
+ struct addrinfo hints, *ai, *aitop;
+ int ipv6preferred;
+#ifdef HAVE_LINUX
+ char *interface;
+#endif
+
cp
- if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+
+ if(!get_config_string(lookup_config(config_tree, "BindToAddress"), &address))
{
- close(nfd);
- syslog(LOG_ERR, _("Creating socket failed: %m"));
+ address = NULL;
+ }
+
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = IPPROTO_UDP;
+ hints.ai_family = AF_INET;
+ if(get_config_bool(lookup_config(config_tree, "IPv6Preferred"), &ipv6preferred))
+ {
+ if(ipv6preferred)
+ hints.ai_family = PF_UNSPEC;
+ }
+ if((r = getaddrinfo(address, n->port, &hints, &aitop)) != 0)
+ {
+ syslog(LOG_ERR, _("Looking up `%s' failed: %s\n"),
+ address, gai_strerror(r));
return -1;
}
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
- flags = fcntl(nfd, F_GETFL);
- if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
+ /* Try to create a listening socket for all alternatives we got from
+ getaddrinfo. */
+ for(ai = aitop; ai != NULL; ai = ai->ai_next)
{
- close(nfd);
- syslog(LOG_ERR, _("System call `%s' failed: %m"),
- "fcntl");
- return -1;
- }
+ if((nfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) < 0)
+ {
+ syslog(LOG_ERR, _("Creating metasocket failed: %m"));
+ continue;
+ }
+
+ flags = fcntl(nfd, F_GETFL);
+ if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("System call `%s' failed: %m"),
+ "fcntl");
+ continue;
+ }
+
+ /* Optimize UDP settings */
+
+ option = 1;
+ setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
+#ifdef HAVE_LINUX
+ if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
+ if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
+ continue;
+ }
+#endif
- memset(&a, 0, sizeof(a));
- a.sin_family = AF_INET;
- a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
+ if(bind(nfd, ai->ai_addr, ai->ai_addrlen))
+ {
+ close(nfd);
+ syslog(LOG_ERR, _("Can't bind to %s port %d/tcp: %m"),
+ ai->ai_canonname, n->port);
+ continue;
+ }
+
+ break; /* We have successfully bound to a socket */
+ }
- if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
+ if(ai == NULL) /* None of the alternatives succeeded */
{
- close(nfd);
- syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
+ syslog(LOG_ERR, _("Failed to open a listening socket."));
return -1;
}
cp
return -1;
}
*/
- if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port))
- myself->port = 655;
+ if(!get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myself->port))
+ myself->port = "655";
myself->connection->port = myself->port;
cp
/* Open sockets */
- if((tcp_socket = setup_listen_socket(myself->port)) < 0)
+ if((tcp_socket = setup_listen_socket(myself)) < 0)
{
syslog(LOG_ERR, _("Unable to set up a listening TCP socket!"));
return -1;
}
- if((udp_socket = setup_vpn_in_socket(myself->port)) < 0)
+ if((udp_socket = setup_vpn_in_socket(myself)) < 0)
{
syslog(LOG_ERR, _("Unable to set up a listening UDP socket!"));
return -1;
return NULL;
}
- c->address = ntohl(ci.sin_addr.s_addr);
+ asprintf(&(c->address), " = ntohl(ci.sin_addr.s_addr);
c->hostname = hostlookup(ci.sin_addr.s_addr);
- c->port = htons(ci.sin_port);
+ asprintf(&(c->port), "%d", htons(ci.sin_port));
c->socket = sfd;
c->last_ping_time = time(NULL);
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