ref: b959508d906a6f7c98fe03b8bfd520370061f20f
dir: /sys/src/cmd/ip/dhcpd/ndb.c/
/*
* this currently only works for ethernet bootp's -- presotto
*/
#include <u.h>
#include <libc.h>
#include <ip.h>
#include <bio.h>
#include <ndb.h>
#include "dat.h"
static Ndb *db;
char *ndbfile;
/*
* 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;
}
Ipifc*
findifc(uchar *ip)
{
Ipifc *ifc;
for(ifc = ipifcs; ifc != nil; ifc = ifc->next){
if(iplocalonifc(ifc, ip) != nil)
return ifc;
}
return nil;
}
void
localip(uchar *laddr, uchar *raddr, Ipifc *ifc)
{
Iplifc *lifc;
if((lifc = ipremoteonifc(ifc, raddr)) != nil)
ipmove(laddr, lifc->ip);
else if(ipcmp(laddr, IPv4bcast) == 0)
ipmove(laddr, IPnoaddr);
}
static void
setipaddr(uchar *addr, char *ip)
{
if(ipcmp(addr, IPnoaddr) == 0)
parseip(addr, ip);
}
static void
setipmask(uchar *mask, char *ip)
{
if(ipcmp(mask, IPnoaddr) == 0)
parseipmask(mask, ip, 1);
}
/*
* do an ipinfo with defaults
*/
int
lookupip(uchar *ipaddr, char *hwattr, char *hwval, Info *iip, int gate)
{
char ip[32];
Ndbtuple *t, *nt;
char *attrs[32], **p;
if(opendb() == nil){
warning("can't open db: %r");
return -1;
}
p = attrs;
*p++ = "ip";
*p++ = "ipmask";
*p++ = "@ipgw";
if(!gate){
*p++ = "dom";
*p++ = "bootf";
*p++ = "bootf2";
*p++ = "@tftp";
*p++ = "@tftp2";
*p++ = "@fs";
*p++ = "@auth";
*p++ = "rootpath";
*p++ = "@rootserver";
*p++ = "vendor";
}
if(hwattr != nil)
*p++ = hwattr;
*p = 0;
memset(iip, 0, sizeof(*iip));
snprint(ip, sizeof(ip), "%I", ipaddr);
t = ndbipinfo(db, "ip", ip, attrs, p - attrs);
if(t == nil)
return -1;
for(nt = t; nt != nil; nt = nt->entry){
if(strcmp(nt->attr, "ip") == 0)
setipaddr(iip->ipaddr, nt->val);
else
if(strcmp(nt->attr, "ipmask") == 0)
setipmask(iip->ipmask, nt->val);
else
if(strcmp(nt->attr, "ipgw") == 0)
setipaddr(iip->gwip, nt->val);
else
if(strcmp(nt->attr, "dom") == 0){
if(iip->domain[0] == 0)
strncpy(iip->domain, nt->val, sizeof(iip->domain)-1);
}
else
if(strcmp(nt->attr, "bootf") == 0){
if(iip->bootf[0] == 0)
strncpy(iip->bootf, nt->val, sizeof(iip->bootf)-1);
}
else
if(strcmp(nt->attr, "bootf2") == 0){
if(iip->bootf2[0] == 0)
strncpy(iip->bootf2, nt->val, sizeof(iip->bootf2)-1);
}
else
if(strcmp(nt->attr, "tftp") == 0)
setipaddr(iip->tftp, nt->val);
else
if(strcmp(nt->attr, "tftp2") == 0)
setipaddr(iip->tftp2, nt->val);
else
if(strcmp(nt->attr, "fs") == 0)
setipaddr(iip->fsip, nt->val);
else
if(strcmp(nt->attr, "auth") == 0)
setipaddr(iip->auip, nt->val);
else
if(strcmp(nt->attr, "rootpath") == 0){
if(iip->rootpath[0] == 0)
strncpy(iip->rootpath, nt->val, sizeof(iip->rootpath)-1);
}
else
if(strcmp(nt->attr, "rootserver") == 0)
setipaddr(iip->rootserverip, nt->val);
else
if(strcmp(nt->attr, "vendor") == 0){
if(iip->vendor[0] == 0)
strncpy(iip->vendor, nt->val, sizeof(iip->vendor)-1);
}
if(hwattr != nil && strcmp(nt->attr, hwattr) == 0)
if(strcmp(hwval, nt->val) == 0)
iip->indb = 1;
}
ndbfree(t);
maskip(iip->ipaddr, iip->ipmask, iip->ipnet);
return 0;
}
/*
* lookup info about a client in the database. Find an address on the
* same net as riip.
*/
int
lookup(Bootp *bp, Info *iip, Info *riip)
{
char *hwattr, hwval[Maxhwlen*2+1];
uchar ciaddr[IPaddrlen];
Ndbtuple *t, *nt;
Ndbs s;
memset(iip, 0, sizeof(*iip));
if(opendb() == nil){
warning("can't open db: %r");
return -1;
}
switch(bp->htype){
case 1:
hwattr = "ether";
snprint(hwval, sizeof(hwval), "%E", bp->chaddr);
break;
default:
hwattr = nil;
}
/* client knows its address? */
v4tov6(ciaddr, bp->ciaddr);
if(validip(ciaddr)){
if(!samenet(ciaddr, riip)){
if(riip->ifc != nil)
warning("%I not on %s", ciaddr, riip->ifc->dev);
else
warning("%I not on %I", ciaddr, riip->ipnet);
return -1;
}
if(lookupip(ciaddr, hwattr, hwval, iip, 0) < 0) {
if (debug)
warning("don't know %I", ciaddr);
return -1; /* don't know anything about it */
}
return 0;
}
if(hwattr == nil)
return -1;
/*
* use hardware address to find an ip address on
* same net as riip
*/
t = ndbsearch(db, &s, hwattr, hwval);
while(t != nil){
for(nt = t; nt != nil; nt = nt->entry){
if(strcmp(nt->attr, "ip") != 0)
continue;
if(parseip(ciaddr, nt->val) == -1 || !isv4(ciaddr))
continue;
if(!validip(ciaddr))
continue;
if(!samenet(ciaddr, riip))
continue;
if(lookupip(ciaddr, hwattr, hwval, iip, 0) < 0)
continue;
ndbfree(t);
return 0;
}
ndbfree(t);
t = ndbsnext(&s, hwattr, hwval);
}
return -1;
}
/*
* interface to ndbipinfo
*/
Ndbtuple*
lookupinfo(uchar *ipaddr, char **attr, int n)
{
char ip[64];
snprint(ip, sizeof ip, "%I", ipaddr);
return ndbipinfo(db, "ip", ip, attr, n);
}
/*
* return the ip addresses for a type of server for system ip
*/
int
lookupserver(char *attr, uchar **ipaddrs, int naddrs, Ndbtuple *t)
{
Ndbtuple *nt;
int rv = 0;
for(nt = t; rv < naddrs && nt != nil; nt = nt->entry){
if(strcmp(nt->attr, attr) != 0)
continue;
if(parseip(ipaddrs[rv], nt->val) == -1)
continue;
rv++;
}
return rv;
}
/*
* just lookup the name
*/
void
lookupname(char *val, int len, Ndbtuple *t)
{
Ndbtuple *nt;
for(nt = t; nt != nil; nt = nt->entry)
if(strcmp(nt->attr, "dom") == 0){
if(utf2idn(nt->val, val, len) < 0)
strncpy(val, nt->val, len-1);
val[len-1] = 0;
break;
}
}