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n2n/sn.c

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/**
* (C) 2007-18 - ntop.org and contributors
*
* 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
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not see see <http://www.gnu.org/licenses/>
*
*/
/* Supernode for n2n-2.x */
#include "n2n.h"
#define N2N_SN_LPORT_DEFAULT 7654
#define N2N_SN_PKTBUF_SIZE 2048
#define N2N_SN_MGMT_PORT 5645
struct sn_stats {
size_t errors; /* Number of errors encountered. */
size_t reg_super; /* Number of REGISTER_SUPER requests received. */
size_t reg_super_nak; /* Number of REGISTER_SUPER requests declined. */
size_t fwd; /* Number of messages forwarded. */
size_t broadcast; /* Number of messages broadcast to a community. */
time_t last_fwd; /* Time when last message was forwarded. */
time_t last_reg_super; /* Time when last REGISTER_SUPER was received. */
};
typedef struct sn_stats sn_stats_t;
struct n2n_sn {
time_t start_time; /* Used to measure uptime. */
sn_stats_t stats;
int daemon; /* If non-zero then daemonise. */
uint16_t lport; /* Local UDP port to bind to. */
int sock; /* Main socket for UDP traffic with edges. */
int mgmt_sock; /* management socket. */
struct peer_info * edges; /* Link list of registered edges. */
};
typedef struct n2n_sn n2n_sn_t;
static int try_forward( n2n_sn_t * sss,
const n2n_common_t * cmn,
const n2n_mac_t dstMac,
const uint8_t * pktbuf,
size_t pktsize );
static int try_broadcast( n2n_sn_t * sss,
const n2n_common_t * cmn,
const n2n_mac_t srcMac,
const uint8_t * pktbuf,
size_t pktsize );
/** Initialise the supernode structure */
static int init_sn( n2n_sn_t * sss )
{
#ifdef WIN32
initWin32();
#endif
memset( sss, 0, sizeof(n2n_sn_t) );
sss->daemon = 1; /* By defult run as a daemon. */
sss->lport = N2N_SN_LPORT_DEFAULT;
sss->sock = -1;
sss->mgmt_sock = -1;
sss->edges = NULL;
return 0; /* OK */
}
/** Deinitialise the supernode structure and deallocate any memory owned by
* it. */
static void deinit_sn( n2n_sn_t * sss )
{
if (sss->sock >= 0)
{
closesocket(sss->sock);
}
sss->sock=-1;
if ( sss->mgmt_sock >= 0 )
{
closesocket(sss->mgmt_sock);
}
sss->mgmt_sock=-1;
purge_peer_list( &(sss->edges), 0xffffffff );
}
/** Determine the appropriate lifetime for new registrations.
*
* If the supernode has been put into a pre-shutdown phase then this lifetime
* should not allow registrations to continue beyond the shutdown point.
*/
static uint16_t reg_lifetime( n2n_sn_t * sss )
{
return 120;
}
/** Update the edge table with the details of the edge which contacted the
* supernode. */
static int update_edge( n2n_sn_t * sss,
const n2n_mac_t edgeMac,
const n2n_community_t community,
const n2n_sock_t * sender_sock,
time_t now)
{
macstr_t mac_buf;
n2n_sock_str_t sockbuf;
struct peer_info * scan;
traceEvent( TRACE_DEBUG, "update_edge for %s [%s]",
macaddr_str( mac_buf, edgeMac ),
sock_to_cstr( sockbuf, sender_sock ) );
scan = find_peer_by_mac( sss->edges, edgeMac );
if ( NULL == scan )
{
/* Not known */
scan = (struct peer_info*)calloc(1, sizeof(struct peer_info)); /* deallocated in purge_expired_registrations */
memcpy(scan->community_name, community, sizeof(n2n_community_t) );
memcpy(&(scan->mac_addr), edgeMac, sizeof(n2n_mac_t));
memcpy(&(scan->sock), sender_sock, sizeof(n2n_sock_t));
/* insert this guy at the head of the edges list */
scan->next = sss->edges; /* first in list */
sss->edges = scan; /* head of list points to new scan */
traceEvent( TRACE_INFO, "update_edge created %s ==> %s",
macaddr_str( mac_buf, edgeMac ),
sock_to_cstr( sockbuf, sender_sock ) );
}
else
{
/* Known */
if ( (0 != memcmp(community, scan->community_name, sizeof(n2n_community_t))) ||
(0 != sock_equal(sender_sock, &(scan->sock) )) )
{
memcpy(scan->community_name, community, sizeof(n2n_community_t) );
memcpy(&(scan->sock), sender_sock, sizeof(n2n_sock_t));
traceEvent( TRACE_INFO, "update_edge updated %s ==> %s",
macaddr_str( mac_buf, edgeMac ),
sock_to_cstr( sockbuf, sender_sock ) );
}
else
{
traceEvent( TRACE_DEBUG, "update_edge unchanged %s ==> %s",
macaddr_str( mac_buf, edgeMac ),
sock_to_cstr( sockbuf, sender_sock ) );
}
}
scan->last_seen = now;
return 0;
}
/** Send a datagram to the destination embodied in a n2n_sock_t.
*
* @return -1 on error otherwise number of bytes sent
*/
static ssize_t sendto_sock(n2n_sn_t * sss,
const n2n_sock_t * sock,
const uint8_t * pktbuf,
size_t pktsize)
{
n2n_sock_str_t sockbuf;
if ( AF_INET == sock->family )
{
struct sockaddr_in udpsock;
udpsock.sin_family = AF_INET;
udpsock.sin_port = htons( sock->port );
memcpy( &(udpsock.sin_addr.s_addr), &(sock->addr.v4), IPV4_SIZE );
traceEvent( TRACE_DEBUG, "sendto_sock %lu to [%s]",
pktsize,
sock_to_cstr( sockbuf, sock ) );
return sendto( sss->sock, pktbuf, pktsize, 0,
(const struct sockaddr *)&udpsock, sizeof(struct sockaddr_in) );
}
else
{
/* AF_INET6 not implemented */
errno = EAFNOSUPPORT;
return -1;
}
}
/** Try to forward a message to a unicast MAC. If the MAC is unknown then
* broadcast to all edges in the destination community.
*/
static int try_forward( n2n_sn_t * sss,
const n2n_common_t * cmn,
const n2n_mac_t dstMac,
const uint8_t * pktbuf,
size_t pktsize )
{
struct peer_info * scan;
macstr_t mac_buf;
n2n_sock_str_t sockbuf;
scan = find_peer_by_mac( sss->edges, dstMac );
if ( NULL != scan )
{
int data_sent_len;
data_sent_len = sendto_sock( sss, &(scan->sock), pktbuf, pktsize );
if ( data_sent_len == pktsize )
{
++(sss->stats.fwd);
traceEvent(TRACE_DEBUG, "unicast %lu to [%s] %s",
pktsize,
sock_to_cstr( sockbuf, &(scan->sock) ),
macaddr_str(mac_buf, scan->mac_addr));
}
else
{
++(sss->stats.errors);
traceEvent(TRACE_ERROR, "unicast %lu to [%s] %s FAILED (%d: %s)",
pktsize,
sock_to_cstr( sockbuf, &(scan->sock) ),
macaddr_str(mac_buf, scan->mac_addr),
errno, strerror(errno) );
}
}
else
{
traceEvent( TRACE_DEBUG, "try_forward unknown MAC" );
/* Not a known MAC so drop. */
}
return 0;
}
/** Try and broadcast a message to all edges in the community.
*
* This will send the exact same datagram to zero or more edges registered to
* the supernode.
*/
static int try_broadcast( n2n_sn_t * sss,
const n2n_common_t * cmn,
const n2n_mac_t srcMac,
const uint8_t * pktbuf,
size_t pktsize )
{
struct peer_info * scan;
macstr_t mac_buf;
n2n_sock_str_t sockbuf;
traceEvent( TRACE_DEBUG, "try_broadcast" );
scan = sss->edges;
while(scan != NULL)
{
if( 0 == (memcmp(scan->community_name, cmn->community, sizeof(n2n_community_t)) )
&& (0 != memcmp(srcMac, scan->mac_addr, sizeof(n2n_mac_t)) ) )
/* REVISIT: exclude if the destination socket is where the packet came from. */
{
int data_sent_len;
data_sent_len = sendto_sock(sss, &(scan->sock), pktbuf, pktsize);
if(data_sent_len != pktsize)
{
++(sss->stats.errors);
traceEvent(TRACE_WARNING, "multicast %lu to [%s] %s failed %s",
pktsize,
sock_to_cstr( sockbuf, &(scan->sock) ),
macaddr_str(mac_buf, scan->mac_addr),
strerror(errno));
}
else
{
++(sss->stats.broadcast);
traceEvent(TRACE_DEBUG, "multicast %lu to [%s] %s",
pktsize,
sock_to_cstr( sockbuf, &(scan->sock) ),
macaddr_str(mac_buf, scan->mac_addr));
}
}
scan = scan->next;
} /* while */
return 0;
}
static int process_mgmt( n2n_sn_t * sss,
const struct sockaddr_in * sender_sock,
const uint8_t * mgmt_buf,
size_t mgmt_size,
time_t now)
{
char resbuf[N2N_SN_PKTBUF_SIZE];
size_t ressize=0;
ssize_t r;
traceEvent( TRACE_DEBUG, "process_mgmt" );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"----------------\n" );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"uptime %lu\n", (now - sss->start_time) );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"edges %u\n",
(unsigned int)peer_list_size( sss->edges ) );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"errors %u\n",
(unsigned int)sss->stats.errors );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"reg_sup %u\n",
(unsigned int)sss->stats.reg_super );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"reg_nak %u\n",
(unsigned int)sss->stats.reg_super_nak );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"fwd %u\n",
(unsigned int) sss->stats.fwd );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"broadcast %u\n",
(unsigned int) sss->stats.broadcast );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"last fwd %lu sec ago\n",
(long unsigned int)(now - sss->stats.last_fwd) );
ressize += snprintf( resbuf+ressize, N2N_SN_PKTBUF_SIZE-ressize,
"last reg %lu sec ago\n",
(long unsigned int) (now - sss->stats.last_reg_super) );
r = sendto( sss->mgmt_sock, resbuf, ressize, 0/*flags*/,
(struct sockaddr *)sender_sock, sizeof(struct sockaddr_in) );
if ( r <= 0 )
{
++(sss->stats.errors);
traceEvent( TRACE_ERROR, "process_mgmt : sendto failed. %s", strerror(errno) );
}
return 0;
}
/** Examine a datagram and determine what to do with it.
*
*/
static int process_udp( n2n_sn_t * sss,
const struct sockaddr_in * sender_sock,
const uint8_t * udp_buf,
size_t udp_size,
time_t now)
{
n2n_common_t cmn; /* common fields in the packet header */
size_t rem;
size_t idx;
size_t msg_type;
uint8_t from_supernode;
macstr_t mac_buf;
macstr_t mac_buf2;
n2n_sock_str_t sockbuf;
traceEvent( TRACE_DEBUG, "process_udp(%lu)", udp_size );
/* Use decode_common() to determine the kind of packet then process it:
*
* REGISTER_SUPER adds an edge and generate a return REGISTER_SUPER_ACK
*
* REGISTER, REGISTER_ACK and PACKET messages are forwarded to their
* destination edge. If the destination is not known then PACKETs are
* broadcast.
*/
rem = udp_size; /* Counts down bytes of packet to protect against buffer overruns. */
idx = 0; /* marches through packet header as parts are decoded. */
if ( decode_common(&cmn, udp_buf, &rem, &idx) < 0 )
{
traceEvent( TRACE_ERROR, "Failed to decode common section" );
return -1; /* failed to decode packet */
}
msg_type = cmn.pc; /* packet code */
from_supernode= cmn.flags & N2N_FLAGS_FROM_SUPERNODE;
if ( cmn.ttl < 1 )
{
traceEvent( TRACE_WARNING, "Expired TTL" );
return 0; /* Don't process further */
}
--(cmn.ttl); /* The value copied into all forwarded packets. */
if ( msg_type == MSG_TYPE_PACKET )
{
/* PACKET from one edge to another edge via supernode. */
/* pkt will be modified in place and recoded to an output of potentially
* different size due to addition of the socket.*/
n2n_PACKET_t pkt;
n2n_common_t cmn2;
uint8_t encbuf[N2N_SN_PKTBUF_SIZE];
size_t encx=0;
int unicast; /* non-zero if unicast */
const uint8_t * rec_buf; /* either udp_buf or encbuf */
sss->stats.last_fwd=now;
decode_PACKET( &pkt, &cmn, udp_buf, &rem, &idx );
unicast = (0 == is_multi_broadcast(pkt.dstMac) );
traceEvent( TRACE_DEBUG, "Rx PACKET (%s) %s -> %s %s",
(unicast?"unicast":"multicast"),
macaddr_str( mac_buf, pkt.srcMac ),
macaddr_str( mac_buf2, pkt.dstMac ),
(from_supernode?"from sn":"local") );
if ( !from_supernode )
{
memcpy( &cmn2, &cmn, sizeof( n2n_common_t ) );
/* We are going to add socket even if it was not there before */
cmn2.flags |= N2N_FLAGS_SOCKET | N2N_FLAGS_FROM_SUPERNODE;
pkt.sock.family = AF_INET;
pkt.sock.port = ntohs(sender_sock->sin_port);
memcpy( pkt.sock.addr.v4, &(sender_sock->sin_addr.s_addr), IPV4_SIZE );
rec_buf = encbuf;
/* Re-encode the header. */
encode_PACKET( encbuf, &encx, &cmn2, &pkt );
/* Copy the original payload unchanged */
encode_buf( encbuf, &encx, (udp_buf + idx), (udp_size - idx ) );
}
else
{
/* Already from a supernode. Nothing to modify, just pass to
* destination. */
traceEvent( TRACE_DEBUG, "Rx PACKET fwd unmodified" );
rec_buf = udp_buf;
encx = udp_size;
}
/* Common section to forward the final product. */
if ( unicast )
{
try_forward( sss, &cmn, pkt.dstMac, rec_buf, encx );
}
else
{
try_broadcast( sss, &cmn, pkt.srcMac, rec_buf, encx );
}
}/* MSG_TYPE_PACKET */
else if ( msg_type == MSG_TYPE_REGISTER )
{
/* Forwarding a REGISTER from one edge to the next */
n2n_REGISTER_t reg;
n2n_common_t cmn2;
uint8_t encbuf[N2N_SN_PKTBUF_SIZE];
size_t encx=0;
int unicast; /* non-zero if unicast */
const uint8_t * rec_buf; /* either udp_buf or encbuf */
sss->stats.last_fwd=now;
decode_REGISTER( &reg, &cmn, udp_buf, &rem, &idx );
unicast = (0 == is_multi_broadcast(reg.dstMac) );
if ( unicast )
{
traceEvent( TRACE_DEBUG, "Rx REGISTER %s -> %s %s",
macaddr_str( mac_buf, reg.srcMac ),
macaddr_str( mac_buf2, reg.dstMac ),
((cmn.flags & N2N_FLAGS_FROM_SUPERNODE)?"from sn":"local") );
if ( 0 != (cmn.flags & N2N_FLAGS_FROM_SUPERNODE) )
{
memcpy( &cmn2, &cmn, sizeof( n2n_common_t ) );
/* We are going to add socket even if it was not there before */
cmn2.flags |= N2N_FLAGS_SOCKET | N2N_FLAGS_FROM_SUPERNODE;
reg.sock.family = AF_INET;
reg.sock.port = ntohs(sender_sock->sin_port);
memcpy( reg.sock.addr.v4, &(sender_sock->sin_addr.s_addr), IPV4_SIZE );
rec_buf = encbuf;
/* Re-encode the header. */
encode_REGISTER( encbuf, &encx, &cmn2, &reg );
/* Copy the original payload unchanged */
encode_buf( encbuf, &encx, (udp_buf + idx), (udp_size - idx ) );
}
else
{
/* Already from a supernode. Nothing to modify, just pass to
* destination. */
rec_buf = udp_buf;
encx = udp_size;
}
try_forward( sss, &cmn, reg.dstMac, rec_buf, encx ); /* unicast only */
}
else
{
traceEvent( TRACE_ERROR, "Rx REGISTER with multicast destination" );
}
}
else if ( msg_type == MSG_TYPE_REGISTER_ACK )
{
traceEvent( TRACE_DEBUG, "Rx REGISTER_ACK (NOT IMPLEMENTED) SHould not be via supernode" );
}
else if ( msg_type == MSG_TYPE_REGISTER_SUPER )
{
n2n_REGISTER_SUPER_t reg;
n2n_REGISTER_SUPER_ACK_t ack;
n2n_common_t cmn2;
uint8_t ackbuf[N2N_SN_PKTBUF_SIZE];
size_t encx=0;
/* Edge requesting registration with us. */
sss->stats.last_reg_super=now;
++(sss->stats.reg_super);
decode_REGISTER_SUPER( &reg, &cmn, udp_buf, &rem, &idx );
cmn2.ttl = N2N_DEFAULT_TTL;
cmn2.pc = n2n_register_super_ack;
cmn2.flags = N2N_FLAGS_SOCKET | N2N_FLAGS_FROM_SUPERNODE;
memcpy( cmn2.community, cmn.community, sizeof(n2n_community_t) );
memcpy( &(ack.cookie), &(reg.cookie), sizeof(n2n_cookie_t) );
memcpy( ack.edgeMac, reg.edgeMac, sizeof(n2n_mac_t) );
ack.lifetime = reg_lifetime( sss );
ack.sock.family = AF_INET;
ack.sock.port = ntohs(sender_sock->sin_port);
memcpy( ack.sock.addr.v4, &(sender_sock->sin_addr.s_addr), IPV4_SIZE );
ack.num_sn=0; /* No backup */
memset( &(ack.sn_bak), 0, sizeof(n2n_sock_t) );
traceEvent( TRACE_DEBUG, "Rx REGISTER_SUPER for %s [%s]",
macaddr_str( mac_buf, reg.edgeMac ),
sock_to_cstr( sockbuf, &(ack.sock) ) );
update_edge( sss, reg.edgeMac, cmn.community, &(ack.sock), now );
encode_REGISTER_SUPER_ACK( ackbuf, &encx, &cmn2, &ack );
sendto( sss->sock, ackbuf, encx, 0,
(struct sockaddr *)sender_sock, sizeof(struct sockaddr_in) );
traceEvent( TRACE_DEBUG, "Tx REGISTER_SUPER_ACK for %s [%s]",
macaddr_str( mac_buf, reg.edgeMac ),
sock_to_cstr( sockbuf, &(ack.sock) ) );
}
return 0;
}
/* *************************************************** */
/** Help message to print if the command line arguments are not valid. */
static void help()
{
print_n2n_version();
printf("supernode <config file> (see supernode.conf)\n"
"or\n"
);
printf("supernode ");
printf("-l <lport> ");
printf("[-f] ");
printf("[-v] ");
printf("\n\n");
printf("-l <lport>\tSet UDP main listen port to <lport>\n");
#if defined(N2N_HAVE_DAEMON)
printf("-f \tRun in foreground.\n");
#endif /* #if defined(N2N_HAVE_DAEMON) */
printf("-v \tIncrease verbosity. Can be used multiple times.\n");
printf("-h \tThis help message.\n");
printf("\n");
exit(1);
}
/* *************************************************** */
static int run_loop( n2n_sn_t * sss );
/* *************************************************** */
static int setOption(int optkey, char *optarg, n2n_sn_t *sss) {
//traceEvent(TRACE_NORMAL, "Option %c = %s", optkey, optarg ? optarg : "");
switch(optkey) {
case 'l': /* local-port */
{
sss->lport = atoi(optarg);
break;
}
case 'f': /* foreground */
{
sss->daemon = 0;
break;
}
case 'h': /* help */
{
help();
break;
}
case 'v': /* verbose */
{
++traceLevel;
break;
}
default:
{
traceEvent(TRACE_WARNING, "Unknown option -%c: Ignored.", (char)optkey);
return(-1);
}
}
return(0);
}
/* *********************************************** */
static const struct option long_options[] = {
{ "foreground", no_argument, NULL, 'f' },
{ "local-port", required_argument, NULL, 'l' },
{ "help" , no_argument, NULL, 'h' },
{ "verbose", no_argument, NULL, 'v' },
{ NULL, 0, NULL, 0 }
};
/* *************************************************** */
/* read command line options */
static int loadFromCLI(int argc, char * const argv[], n2n_sn_t *sss) {
u_char c;
while((c = getopt_long(argc, argv,
"fl:vh",
long_options, NULL)) != '?') {
if(c == 255) break;
setOption(c, optarg, sss);
}
return 0;
}
/* *************************************************** */
static char *trim(char *s) {
char *end;
while(isspace(s[0]) || (s[0] == '"') || (s[0] == '\'')) s++;
if(s[0] == 0) return s;
end = &s[strlen(s) - 1];
while(end > s
&& (isspace(end[0])|| (end[0] == '"') || (end[0] == '\'')))
end--;
end[1] = 0;
return s;
}
/* *************************************************** */
/* parse the configuration file */
static int loadFromFile(const char *path, n2n_sn_t *sss) {
char buffer[4096], *line, *key, *value;
u_int line_len, opt_name_len;
FILE *fd;
const struct option *opt;
fd = fopen(path, "r");
if(fd == NULL) {
traceEvent(TRACE_WARNING, "Config file %s not found", path);
return -1;
}
while((line = fgets(buffer, sizeof(buffer), fd)) != NULL) {
line = trim(line);
value = NULL;
if((line_len = strlen(line)) < 2 || line[0] == '#')
continue;
if(!strncmp(line, "--", 2)) { /* long opt */
key = &line[2], line_len -= 2;
opt = long_options;
while(opt->name != NULL) {
opt_name_len = strlen(opt->name);
if(!strncmp(key, opt->name, opt_name_len)
&& (line_len <= opt_name_len
|| key[opt_name_len] == '\0'
|| key[opt_name_len] == ' '
|| key[opt_name_len] == '=')) {
if(line_len > opt_name_len) key[opt_name_len] = '\0';
if(line_len > opt_name_len + 1) value = trim(&key[opt_name_len + 1]);
// traceEvent(TRACE_NORMAL, "long key: %s value: %s", key, value);
setOption(opt->val, value, sss);
break;
}
opt++;
}
} else if(line[0] == '-') { /* short opt */
key = &line[1], line_len--;
if(line_len > 1) key[1] = '\0';
if(line_len > 2) value = trim(&key[2]);
// traceEvent(TRACE_NORMAL, "key: %c value: %s", key[0], value);
setOption(key[0], value, sss);
} else {
traceEvent(TRACE_WARNING, "Skipping unrecognized line: %s", line);
continue;
}
}
fclose(fd);
return 0;
}
/* *************************************************** */
/** Main program entry point from kernel. */
int main( int argc, char * const argv[] )
{
int rc;
n2n_sn_t sss;
if(argc == 1)
help();
init_sn(&sss);
#ifndef WIN32
if((argc >= 2) && (argv[1][0] != '-'))
{
rc = loadFromFile(argv[1], &sss);
if (argc > 2)
rc = loadFromCLI(argc, argv, &sss);
} else
#endif
rc = loadFromCLI(argc, argv, &sss);
if (rc < 0)
return(-1);
#if defined(N2N_HAVE_DAEMON)
if (sss.daemon)
{
useSyslog=1; /* traceEvent output now goes to syslog. */
if ( -1 == daemon( 0, 0 ) )
{
traceEvent( TRACE_ERROR, "Failed to become daemon." );
exit(-5);
}
}
#endif /* #if defined(N2N_HAVE_DAEMON) */
traceEvent( TRACE_DEBUG, "traceLevel is %d", traceLevel);
sss.sock = open_socket(sss.lport, 1 /*bind ANY*/ );
if ( -1 == sss.sock )
{
traceEvent( TRACE_ERROR, "Failed to open main socket. %s", strerror(errno) );
exit(-2);
}
else
{
traceEvent( TRACE_NORMAL, "supernode is listening on UDP %u (main)", sss.lport );
}
sss.mgmt_sock = open_socket(N2N_SN_MGMT_PORT, 0 /* bind LOOPBACK */ );
if ( -1 == sss.mgmt_sock )
{
traceEvent( TRACE_ERROR, "Failed to open management socket. %s", strerror(errno) );
exit(-2);
}
else
{
traceEvent( TRACE_NORMAL, "supernode is listening on UDP %u (management)", N2N_SN_MGMT_PORT );
}
traceEvent(TRACE_NORMAL, "supernode started");
return run_loop(&sss);
}
/** Long lived processing entry point. Split out from main to simply
* daemonisation on some platforms. */
static int run_loop( n2n_sn_t * sss )
{
uint8_t pktbuf[N2N_SN_PKTBUF_SIZE];
int keep_running=1;
time_t last_purge_edges = 0;
sss->start_time = time(NULL);
while(keep_running)
{
int rc;
ssize_t bread;
int max_sock;
fd_set socket_mask;
struct timeval wait_time;
time_t now=0;
FD_ZERO(&socket_mask);
max_sock = MAX(sss->sock, sss->mgmt_sock);
FD_SET(sss->sock, &socket_mask);
FD_SET(sss->mgmt_sock, &socket_mask);
wait_time.tv_sec = 10; wait_time.tv_usec = 0;
rc = select(max_sock+1, &socket_mask, NULL, NULL, &wait_time);
now = time(NULL);
if(rc > 0)
{
if (FD_ISSET(sss->sock, &socket_mask))
{
struct sockaddr_in sender_sock;
socklen_t i;
i = sizeof(sender_sock);
bread = recvfrom( sss->sock, pktbuf, N2N_SN_PKTBUF_SIZE, 0/*flags*/,
(struct sockaddr *)&sender_sock, (socklen_t*)&i);
if ( bread < 0 ) /* For UDP bread of zero just means no data (unlike TCP). */
{
/* The fd is no good now. Maybe we lost our interface. */
traceEvent( TRACE_ERROR, "recvfrom() failed %d errno %d (%s)", bread, errno, strerror(errno) );
keep_running=0;
break;
}
/* We have a datagram to process */
if ( bread > 0 )
{
/* And the datagram has data (not just a header) */
process_udp( sss, &sender_sock, pktbuf, bread, now );
}
}
if (FD_ISSET(sss->mgmt_sock, &socket_mask))
{
struct sockaddr_in sender_sock;
size_t i;
i = sizeof(sender_sock);
bread = recvfrom( sss->mgmt_sock, pktbuf, N2N_SN_PKTBUF_SIZE, 0/*flags*/,
(struct sockaddr *)&sender_sock, (socklen_t*)&i);
if ( bread <= 0 )
{
traceEvent( TRACE_ERROR, "recvfrom() failed %d errno %d (%s)", bread, errno, strerror(errno) );
keep_running=0;
break;
}
/* We have a datagram to process */
process_mgmt( sss, &sender_sock, pktbuf, bread, now );
}
}
else
{
traceEvent( TRACE_DEBUG, "timeout" );
}
purge_expired_registrations( &(sss->edges), &last_purge_edges );
} /* while */
deinit_sn( sss );
return 0;
}