ref: 042f98784acb9f09013f65b0c93b7f56e1b8a10a
dir: /sys/src/cmd/ip/dhcpd/testlook.c/
#include <u.h>
#include <libc.h>
#include <ip.h>
#include <bio.h>
#include <ndb.h>
static uchar noether[6];
/*
* Look for a pair with the given attribute. look first on the same line,
* then in the whole entry.
*/
static Ndbtuple*
lookval(Ndbtuple *entry, Ndbtuple *line, char *attr, char *to)
{
Ndbtuple *nt;
/* first look on same line (closer binding) */
for(nt = line;;){
if(strcmp(attr, nt->attr) == 0){
strncpy(to, nt->val, Ndbvlen);
return nt;
}
nt = nt->line;
if(nt == line)
break;
}
/* search whole tuple */
for(nt = entry; nt; nt = nt->entry)
if(strcmp(attr, nt->attr) == 0){
strncpy(to, nt->val, Ndbvlen);
return nt;
}
return 0;
}
/*
* lookup an ip address
*/
static uchar*
lookupip(Ndb *db, char *name, uchar *to, Ipinfo *iip)
{
Ndbtuple *t, *nt;
char buf[Ndbvlen];
uchar subnet[IPaddrlen];
Ndbs s;
char *attr;
attr = ipattr(name);
if(strcmp(attr, "ip") == 0){
parseip(to, name);
return to;
}
t = ndbgetval(db, &s, attr, name, "ip", buf);
if(t){
/* first look for match on same subnet */
for(nt = t; nt; nt = nt->entry){
if(strcmp(nt->attr, "ip") != 0)
continue;
parseip(to, nt->val);
maskip(to, iip->ipmask, subnet);
if(memcmp(subnet, iip->ipnet, sizeof(subnet)) == 0)
return to;
}
/* otherwise, just take what we have */
ndbfree(t);
parseip(to, buf);
return to;
}
return 0;
}
/*
* lookup a subnet and fill in anything we can
*/
static void
recursesubnet(Ndb *db, uchar *mask, Ipinfo *iip, char *fs, char *gw, char *au)
{
Ndbs s;
Ndbtuple *t;
uchar submask[IPaddrlen];
char ip[Ndbvlen];
memmove(iip->ipmask, mask, 4);
maskip(iip->ipaddr, iip->ipmask, iip->ipnet);
sprint(ip, "%I", iip->ipnet);
t = ndbsearch(db, &s, "ip", ip);
print("%s->", ip);
if(t){
/* look for a further subnet */
if(lookval(t, s.t, "ipmask", ip)){
parseip(submask, ip);
/* recurse only if it has changed */
if(!equivip(submask, mask))
recursesubnet(db, submask, iip, fs, gw, au);
}
/* fill in what we don't have */
if(gw[0] == 0)
lookval(t, s.t, "ipgw", gw);
if(fs[0] == 0)
lookval(t, s.t, "fs", fs);
if(au[0] == 0)
lookval(t, s.t, "auth", au);
ndbfree(t);
}
}
#ifdef foo
/*
* find out everything we can about a system from what has been
* specified.
*/
int
ipinfo(Ndb *db, char *etherin, char *ipin, char *name, Ipinfo *iip)
{
Ndbtuple *t;
Ndbs s;
char ether[Ndbvlen];
char ip[Ndbvlen];
char fsname[Ndbvlen];
char gwname[Ndbvlen];
char auname[Ndbvlen];
memset(iip, 0, sizeof(Ipinfo));
fsname[0] = 0;
gwname[0] = 0;
auname[0] = 0;
/*
* look for a matching entry
*/
t = 0;
if(etherin)
t = ndbgetval(db, &s, "ether", etherin, "ip", ip);
if(t == 0 && ipin)
t = ndbsearch(db, &s, "ip", ipin);
if(t == 0 && name)
t = ndbgetval(db, &s, ipattr(name), name, "ip", ip);
if(t){
/*
* copy in addresses and name
*/
if(lookval(t, s.t, "ip", ip))
parseip(iip->ipaddr, ip);
if(lookval(t, s.t, "ether", ether))
parseether(iip->etheraddr, ether);
lookval(t, s.t, "dom", iip->domain);
/*
* Look for bootfile, fs, and gateway.
* If necessary, search through all entries for
* this ip address.
*/
while(t){
if(iip->bootf[0] == 0)
lookval(t, s.t, "bootf", iip->bootf);
if(fsname[0] == 0)
lookval(t, s.t, "fs", fsname);
if(gwname[0] == 0)
lookval(t, s.t, "ipgw", gwname);
if(auname[0] == 0)
lookval(t, s.t, "auth", auname);
ndbfree(t);
if(iip->bootf[0] && fsname[0] && gwname[0] && auname[0])
break;
t = ndbsnext(&s, "ether", ether);
}
} else if(ipin) {
/*
* copy in addresses (all we know)
*/
parseip(iip->ipaddr, ipin);
if(etherin)
parseether(iip->etheraddr, etherin);
} else
return -1;
/*
* Look up the client's network and find a subnet mask for it.
* Fill in from the subnet (or net) entry anything we can't figure
* out from the client record.
*/
recursesubnet(db, classmask[CLASS(iip->ipaddr)], iip, fsname, gwname, auname);
/* lookup fs's and gw's ip addresses */
if(fsname[0])
lookupip(db, fsname, iip->fsip, iip);
if(gwname[0])
lookupip(db, gwname, iip->gwip, iip);
if(auname[0])
lookupip(db, auname, iip->auip, iip);
return 0;
}
#endif
void
main(int argc, char **argv)
{
Ipinfo ii;
Ndb *db;
db = ndbopen(0);
fmtinstall('E', eipconv);
fmtinstall('I', eipconv);
if(argc < 2)
exits(0);
if(strchr(argv[1], '.')){
if(ipinfo(db, 0, argv[1], 0, &ii) < 0)
exits(0);
} else {
if(ipinfo(db, argv[1], 0, 0, &ii) < 0)
exits(0);
}
fprint(2, "a %I m %I n %I f %s e %E\n", ii.ipaddr,
ii.ipmask, ii.ipnet, ii.bootf, ii.etheraddr);
}