/*
** SendPacket -- send an RMP packet to a remote host.
**
** Parameters:
** rconn - packet to be sent.
**
** Returns:
** 1 on success, 0 on failure.
**
** Side Effects:
** none.
*/
int
SendPacket(RMPCONN *rconn)
{
/*
* Set Ethernet Destination address to Source (BPF and the enet
* driver will take care of getting our source address set).
*/
memmove((char *)&rconn->rmp.hp_hdr.daddr[0],
(char *)&rconn->rmp.hp_hdr.saddr[0], RMP_ADDRLEN);
rconn->rmp.hp_hdr.len = htons(rconn->rmplen - sizeof(struct hp_hdr));
/*
* Reverse 802.2/HP Extended Source & Destination Access Pts.
*/
rconn->rmp.hp_llc.dxsap = htons(HPEXT_SXSAP);
rconn->rmp.hp_llc.sxsap = htons(HPEXT_DXSAP);
/*
* Last time this connection was active.
*/
(void) gettimeofday(&rconn->tstamp, (struct timezone *)0);
if (DbgFp != NULL) /* display packet */
DispPkt(rconn,DIR_SENT);
/*
* Send RMP packet to remote host.
*/
return(BpfWrite(rconn));
}
int
main(int argc, char *argv[])
{
int c, fd, omask, maxfds;
fd_set rset;
/*
* Close any open file descriptors.
* Temporarily leave stdin & stdout open for `-d',
* and stderr open for any pre-syslog error messages.
*/
{
int i, nfds = getdtablesize();
for (i = 0; i < nfds; i++)
if (i != fileno(stdin) && i != fileno(stdout) &&
i != fileno(stderr))
(void) close(i);
}
/*
* Parse any arguments.
*/
while ((c = getopt(argc, argv, "adi:")) != -1)
switch(c) {
case 'a':
BootAny++;
break;
case 'd':
DebugFlg++;
break;
case 'i':
IntfName = optarg;
break;
default:
usage();
}
for (; optind < argc; optind++) {
if (ConfigFile == NULL)
ConfigFile = argv[optind];
else {
warnx("too many config files (`%s' ignored)",
argv[optind]);
}
}
if (ConfigFile == NULL) /* use default config file */
ConfigFile = DfltConfig;
if (DebugFlg) {
DbgFp = stdout; /* output to stdout */
(void) signal(SIGUSR1, SIG_IGN); /* dont muck w/DbgFp */
(void) signal(SIGUSR2, SIG_IGN);
(void) fclose(stderr); /* finished with it */
} else {
if (daemon(0, 0))
err(1, "can't detach from terminal");
(void) signal(SIGUSR1, DebugOn);
(void) signal(SIGUSR2, DebugOff);
}
openlog("rbootd", LOG_PID, LOG_DAEMON);
/*
* If no interface was specified, get one now.
*
* This is convoluted because we want to get the default interface
* name for the syslog("restarted") message. If BpfGetIntfName()
* runs into an error, it will return a syslog-able error message
* (in `errmsg') which will be displayed here.
*/
if (IntfName == NULL) {
char *errmsg;
if ((IntfName = BpfGetIntfName(&errmsg)) == NULL) {
/* Backslash to avoid trigraph '??)'. */
syslog(LOG_NOTICE, "restarted (?\?)");
/* BpfGetIntfName() returns safe names, using %m */
syslog(LOG_ERR, "%s", errmsg);
Exit(0);
}
}
syslog(LOG_NOTICE, "restarted (%s)", IntfName);
(void) signal(SIGHUP, ReConfig);
(void) signal(SIGINT, Exit);
(void) signal(SIGTERM, Exit);
/*
* Grab our host name and pid.
*/
if (gethostname(MyHost, MAXHOSTNAMELEN - 1) < 0) {
syslog(LOG_ERR, "gethostname: %m");
Exit(0);
}
MyHost[MAXHOSTNAMELEN - 1] = '\0';
MyPid = getpid();
/*
* Write proc's pid to a file.
*/
{
FILE *fp;
if ((fp = fopen(PidFile, "w")) != NULL) {
(void) fprintf(fp, "%d\n", (int) MyPid);
(void) fclose(fp);
} else {
syslog(LOG_WARNING, "fopen: failed (%s)", PidFile);
}
}
/*
* All boot files are relative to the boot directory, we might
* as well chdir() there to make life easier.
*/
if (chdir(BootDir) < 0) {
syslog(LOG_ERR, "chdir: %m (%s)", BootDir);
Exit(0);
}
/*
* Initial configuration.
*/
omask = sigblock(sigmask(SIGHUP)); /* prevent reconfig's */
if (GetBootFiles() == 0) /* get list of boot files */
Exit(0);
if (ParseConfig() == 0) /* parse config file */
Exit(0);
/*
* Open and initialize a BPF device for the appropriate interface.
* If an error is encountered, a message is displayed and Exit()
* is called.
*/
fd = BpfOpen();
(void) sigsetmask(omask); /* allow reconfig's */
/*
* Main loop: receive a packet, determine where it came from,
* and if we service this host, call routine to handle request.
*/
maxfds = fd + 1;
FD_ZERO(&rset);
FD_SET(fd, &rset);
for (;;) {
struct timeval timeout;
fd_set r;
int nsel;
r = rset;
if (RmpConns == NULL) { /* timeout isn't necessary */
nsel = select(maxfds, &r, NULL, NULL, NULL);
} else {
timeout.tv_sec = RMP_TIMEOUT;
timeout.tv_usec = 0;
nsel = select(maxfds, &r, NULL, NULL, &timeout);
}
if (nsel < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "select: %m");
Exit(0);
} else if (nsel == 0) { /* timeout */
DoTimeout(); /* clear stale conns */
continue;
}
if (FD_ISSET(fd, &r)) {
RMPCONN rconn;
CLIENT *client, *FindClient();
int doread = 1;
while (BpfRead(&rconn, doread)) {
doread = 0;
if (DbgFp != NULL) /* display packet */
DispPkt(&rconn,DIR_RCVD);
omask = sigblock(sigmask(SIGHUP));
/*
* If we do not restrict service, set the
* client to NULL (ProcessPacket() handles
* this). Otherwise, check that we can
* service this host; if not, log a message
* and ignore the packet.
*/
if (BootAny) {
client = NULL;
} else if ((client=FindClient(&rconn))==NULL) {
syslog(LOG_INFO,
"%s: boot packet ignored",
EnetStr(&rconn));
(void) sigsetmask(omask);
continue;
}
ProcessPacket(&rconn,client);
(void) sigsetmask(omask);
}
}
}
}
