/*
* open ndbfile as db if not already open. also check for stale data
* and reload as needed.
*/
static Ndb *
opendb(void)
{
static ulong lastcheck;
/* check no more often than once every minute */
if(db == nil) {
db = ndbopen(ndbfile);
if(db != nil)
lastcheck = now;
} else if(now >= lastcheck + 60) {
if (ndbchanged(db))
ndbreopen(db);
lastcheck = now;
}
return db;
}
/*
* open a single file
*/
static struct ndb*
doopen(char *file)
{
struct ndb *db;
db = (struct ndb*)calloc(sizeof(struct ndb), 1);
if(db == 0)
return 0;
memset(db, 0, sizeof(struct ndb));
strncpy(db->file, file, sizeof(db->file)-1);
if(ndbreopen(db) < 0){
free(db);
return 0;
}
return db;
}
/*
* get the system name
*/
static void ipid(void)
{
uint8_t addr[6];
struct ndbtuple *t, *tt;
char *p, *attr;
struct ndbs s;
int f;
char buf[Maxpath];
/* use environment, ether addr, or ipaddr to get system name */
if (mysysname == 0) {
/*
* environment has priority.
*
* on the sgi power the default system name
* is the ip address. ignore that.
*
*/
p = getenv("sysname");
if (p && *p) {
attr = ipattr(p);
if (strcmp(attr, "ip") != 0)
mysysname = strdup(p);
}
/*
* the /net/ndb contains what the network
* figured out from DHCP. use that name if
* there is one.
*/
if (mysysname == 0 && netdb != NULL) {
ndbreopen(netdb);
for (tt = t = ndbparse(netdb); t != NULL; t = t->entry)
{
if (strcmp(t->attr, "sys") == 0) {
mysysname = strdup(t->val);
break;
}
}
ndbfree(tt);
}
/* next network database, ip address, and ether address to find
* a name
*/
if (mysysname == 0) {
t = NULL;
if (isvalidip(ipa))
free(ndbgetvalue(db, &s, "ip", ipaddr, "sys",
&t));
if (t == NULL) {
for (f = 0; f < 3; f++) {
snprintf(buf, sizeof(buf), "%s/ether%d",
mntpt, f);
if (myetheraddr(addr, buf) < 0)
continue;
snprintf(eaddr, sizeof(eaddr), "%E",
addr);
free(ndbgetvalue(db, &s, "ether", eaddr,
"sys", &t));
if (t != NULL)
break;
}
}
for (tt = t; tt != NULL; tt = tt->entry) {
if (strcmp(tt->attr, "sys") == 0) {
mysysname = strdup(tt->val);
break;
}
}
ndbfree(t);
}
/* nothing else worked, use the ip address */
if (mysysname == 0 && isvalidip(ipa))
mysysname = strdup(ipaddr);
/* set /dev/sysname if we now know it */
if (mysysname) {
f = open("/dev/sysname", O_RDWR);
if (f >= 0) {
write(f, mysysname, strlen(mysysname));
close(f);
}
}
}
}