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/*
* This software is Copyright 2011 by Sean Groarke <sgroarke@gmail.com>
* All rights reserved.
*
* This file is part of npd6.
*
* npd6 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.
*
* npd6 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 npd6. If not, see <http://www.gnu.org/licenses/>.
*/
/* $Id$
* $HeadURL$
*/
#include "includes.h"
#include "npd6.h"
//*****************************************************************************
// Globals
//
char *pname;
char *paramName;
int sockpkt;
int debug;
int daemonize;
FILE *logFileFD;
int logging;
char configfile[FILENAME_MAX];
FILE *configFileFD;
int initialIFFlags;
unsigned int interfaceCount; // Total number of interface/prefix combos
// We dynaimcally size this at run-time
struct npd6Interface *interfaces;
// Key behaviour
int naLinkOptFlag; // From config file NPD6OPTFLAG
int nsIgnoreLocal; // From config file NPD6LOCALIG
int naRouter; // From config file NPD6ROUTERNA
int maxHops; // From config file NPD6MAXHOPS
int collectTargets; // From config file NPD6TARGETS
// Target tree data structures etc
void *tRoot;
int tEntries;
// Black/whitelisting data
void *lRoot;
int listType;
int listLog; // From config file NPD6LISTLOG
// Logging - various
int ralog; // From config file NPD6RALOG
// Error handling
int pollErrorLimit; // From config file
char usage_str[] =
{
"\n"
" -c, --config=PATH Sets the config file. Default is /etc/npd6.conf.\n"
" -d, --debug Sets the normal debug level.\n"
" -D, --debug2 Sets full debug level. (Lots!)\n"
" -f, --foreground Run in foreground, otherwise daemonize.\n"
" -h, --help Show this help screen.\n"
" -l --logfile=PATH Sets the log file, else default to syslog. If \"-l -\" then stdout/stderr used.\n"
" -v, --version Print the version and quit.\n"
};
struct option prog_opt[] =
{
{"config", required_argument, 0, 'c'},
{"debug", optional_argument, 0, 'd'},
{"debug2", optional_argument, 0, 'D'},
{"help", optional_argument, 0, 'h'},
{"logfile", required_argument, 0, 'l'},
{"version", optional_argument, 0, 'v'},
{"foreground", optional_argument, 0, 'f'},
{0, 0, 0, 0}
};
#define OPTIONS_STR "c:dDhl:vf"
struct Interface *IfaceList = NULL;
int main(int argc, char *argv[])
{
char logfile[FILENAME_MAX] = "";
int c, err, loop;
// Default some globals
strncpy(configfile, NPD6_CONF, FILENAME_MAX);
daemonize=1;
// Default black/whitelisting to OFF
listType = NOLIST;
// Default config file values as required
naLinkOptFlag = 0;
nsIgnoreLocal = 1;
naRouter = 1;
maxHops = MAXMAXHOPS;
// Logging
listLog=0;
ralog=0;
/* Interface info */
interfaceCount = 0;
/* Parse the args */
while ((c = getopt_long(argc, argv, OPTIONS_STR, prog_opt, NULL)) > 0)
{
if (c==-1)
break;
switch (c) {
case 'c':
strcpy(configfile, optarg);
break;
case 'l':
strcpy(logfile, optarg);
break;
case 'd':
debug=1;
break;
case 'D':
debug=2;
break;
case 'f':
daemonize=0;
break;
case 'v':
showVersion();
return 0;
break;
case 'h':
showUsage();
return 0;
break;
}
}
/* Sort out where to log */
if ( strlen(logfile) )
{
if (strlen(logfile) == 1 && (logfile[0]='-') )
logging = USE_STD;
else
logging = USE_FILE;
}
else
{
logging = USE_SYSLOG;
}
/* Open the log and config*/
if ( (logging == USE_FILE) && (openLog(logfile) < 0) )
{
printf("Exiting. Error in setting up logging correctly.\n");
exit (1);
}
flog(LOG_INFO, "*********************** npd6 *****************************");
if ( readConfig(configfile) )
{
flog(LOG_ERR, "Error in config file: %s", configfile);
return 1;
}
err = init_sockets();
if (err) {
flog(LOG_ERR, "init_sockets: failed to initialise %d sockets.", err);
exit(1);
}
/* Set allmulti on the interfaces */
for (loop=0; loop<interfaceCount; loop++)
{
interfaces[loop].multiStatus = if_allmulti(interfaces[loop].nameStr, TRUE);
}
/* Seems like about the right time to daemonize (or not) */
if (daemonize)
{
if (daemon(0, 0) < 0 )
{
flog(LOG_ERR, "Failed to daemonize. Error: %s", strerror(errno) );
exit(1);
}
}
/* Set up signal handlers */
signal(SIGUSR1, usersignal);
signal(SIGUSR2, usersignal);
signal(SIGHUP, usersignal);
signal(SIGINT, usersignal);
signal(SIGTERM, usersignal); // Typically used by init.d scripts
/* And off we go... */
dispatcher();
flog(LOG_ERR, "Fell back out of dispatcher... This is impossible.");
return 0;
}
void dispatcher(void)
{
struct pollfd *fds;
unsigned int msglen;
unsigned char msgdata[MAX_MSG_SIZE * 2];
int rc;
int fdIdx;
int consecutivePollErrors = 0;
// Each interface has 2 sockets, so we need to allocate for that + 1
fds = (struct pollfd *)calloc( (interfaceCount*2)+1, sizeof(struct pollfd) );
flog(LOG_DEBUG2, "Dynamically allocated %d bytes to the master FD array",
(interfaceCount+1) * sizeof(struct pollfd) );
// In the fds set, the first N positions are for the v6 sockets, the second N
// are for the icmpv6 sockets.
for(fdIdx=0; fdIdx < interfaceCount; fdIdx++)
{
// Packet socket
fds[fdIdx].fd = interfaces[fdIdx].pktSock;
flog(LOG_DEBUG2, "pktSock value is: %d", fds[fdIdx].fd );
fds[fdIdx].events = POLLIN;
fds[fdIdx].revents = 0;
// ICMP socket
// We only bother with this as we get inbound junk on this socket
// (including RAs which we might actually care about now cf. bug 60)
fds[fdIdx+interfaceCount].fd = interfaces[fdIdx].icmpSock;
fds[fdIdx+interfaceCount].events = POLLIN;
fds[fdIdx+interfaceCount].revents = 0;
}
// Tail it
fds[interfaceCount*2].fd = -1;
fds[interfaceCount*2].events = 0;
fds[interfaceCount*2].revents = 0;
for (;;)
{
rc = poll(fds, interfaceCount+1, DISPATCH_TIMEOUT);
//flog(LOG_DEBUG2, "Came off poll with rc = %d", rc);
if (rc > 0)
{
// Most likely event is a valid data item received.
for (fdIdx=0; fdIdx < (interfaceCount*2); fdIdx++)
{
if (fds[fdIdx].revents & POLLIN)
{
// Was it a packet socket?
if(fdIdx < interfaceCount) {
consecutivePollErrors = 0; // reset it
msglen = get_rx(interfaces[fdIdx].pktSock, msgdata);
// msglen is checked for sanity already within get_rx()
flog(LOG_DEBUG2, "For packet socket, get_rx() gave msg with len = %d", msglen);
processNS(fdIdx, msgdata, msglen);
continue;
}
// Or was it an ICMP socket?
if(fdIdx >= interfaceCount) {
struct in6_addr icmp6Addr;
consecutivePollErrors = 0; // reset it
msglen = get_rx_icmp6(interfaces[fdIdx/2].icmpSock, msgdata, &icmp6Addr);
flog(LOG_DEBUG2, "For ICMP6 socket, get_rx_icmp6() gave msg with len = %d", msglen);
// We do nothing at all with the received data!
// Or maybe we do.... Ref. bug/NFR 60: process them
// and yank out the RAs for logging.
// Decide what to do based upon config file option ralog
if (ralog)
{
processICMP(fdIdx, msgdata, msglen, &icmp6Addr);
}
continue;
}
}
// If it wasn't a POLLIN, it is likely an significant error
if (fds[fdIdx].revents & (POLLERR | POLLHUP | POLLNVAL) )
{
flog(LOG_WARNING, "Major socket error on fds %d", fdIdx);
// Try and recover... long shot
close(interfaces[fdIdx].pktSock);
sleep(1);
interfaces[fdIdx].pktSock = open_packet_socket(interfaces[fdIdx].index);
if ( interfaces[fdIdx].pktSock < 0)
{
// Drop dead. We're stuffed.
flog(LOG_ERR, "dispatcher(): failed to reinit stuck socket. Dead.");
exit(1);
}
fds[fdIdx].fd = interfaces[fdIdx].pktSock;
fds[fdIdx].events = POLLIN;
fds[fdIdx].revents = 0;
// Have we had more consecutive errors than the threshold value?
consecutivePollErrors++;
if ((pollErrorLimit > 0) && (consecutivePollErrors >= pollErrorLimit) )
{
flog(LOG_ERR, "dispatcher(): %d consecutive major poll errors. Terminating.",
consecutivePollErrors);
dropdead();
}
continue;
}
}
continue;
}
else if ( rc == 0 )
{
flog(LOG_DEBUG, "Stale select - Idling....... Low activity........");
consecutivePollErrors = 0; // Using the select timeout as our quantum of error counting
// Timer fired?
// One day. If we implement timers.
}
else if ( rc == -1 )
{
/* Truly an error or maybe we processed a signal?*/
if ( errno == EINTR )
{
flog(LOG_ERR, "Broke out of the poll() via a signal event.");
}
else
{
flog(LOG_ERR, "Weird poll error: %s", strerror(errno));
}
continue;
}
flog(LOG_DEBUG, "Timed out of poll(). Timeout was %d ms", DISPATCH_TIMEOUT);
}
}
//*******************************************************
// Give advice.
void showUsage(void)
{
fprintf(stderr, "usage: %s %s\n", pname, usage_str);
}
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