14 static Ndbtuple* filter(Ndb *db, Ndbtuple *t, Ndbtuple *f);
15 static Ndbtuple* mkfilter(int argc, char **argv);
16 static int filtercomplete(Ndbtuple *f);
17 static int prefixlen(uchar *ip);
18 static Ndbtuple* subnet(Ndb *db, uchar *net, Ndbtuple *f, int prefix);
20 /* make a filter to be used in filter */
22 mkfilter(int argc, char **argv)
24 Ndbtuple *t, *first, *last;
36 if(*p == '@'){ /* @attr=val ? */
37 t->ptr |= Faddr; /* return resolved address(es) */
40 strncpy(t->attr, p, sizeof(t->attr)-1);
42 ndbsetmalloctag(first, getcallerpc(&argc));
46 /* return true if every pair of filter has been used */
48 filtercomplete(Ndbtuple *f)
50 for(; f; f = f->entry)
51 if((f->ptr & Fignore) == 0)
56 /* set the attribute of all entries in a tuple */
58 setattr(Ndbtuple *t, char *attr)
62 for(nt = t; nt; nt = nt->entry)
63 strcpy(nt->attr, attr);
68 * return only the attr/value pairs in t maching the filter, f.
69 * others are freed. line structure is preserved.
72 filter(Ndb *db, Ndbtuple *t, Ndbtuple *f)
74 Ndbtuple *nt, *nf, *next;
76 /* filter out what we don't want */
77 for(nt = t; nt; nt = next){
80 /* look through filter */
81 for(nf = f; nf != nil; nf = nf->entry){
82 if(!(nf->ptr&Fignore) && strcmp(nt->attr, nf->attr) == 0)
86 /* remove nt from t */
87 t = ndbdiscard(t, nt);
90 t = ndbsubstitute(t, nt, setattr(ndbgetipaddr(db, nt->val), nt->attr));
95 /* remember filter etnries that matched */
96 for(nf = f; nf != nil; nf = nf->entry)
98 nf->ptr = (nf->ptr & ~Ffound) | Fignore;
100 ndbsetmalloctag(t, getcallerpc(&db));
109 for(y = IPaddrlen-1; y >= 0; y--)
110 for(i = 8; i > 0; i--)
111 if(ip[y] & (1<<(8-i)))
117 * look through containing subsets
120 subnet(Ndb *db, uchar *net, Ndbtuple *f, int prefix)
125 uchar mask[IPaddrlen];
126 Ndbtuple *at[128+1], *nt, *xt, *t;
128 memset(at, 0, sizeof(at));
129 snprint(netstr, sizeof(netstr), "%I", net);
130 nt = ndbsearch(db, &s, "ip", netstr);
132 xt = ndbfindattr(nt, nt, "ipnet");
134 xt = ndbfindattr(nt, nt, "ipmask");
135 if(xt == nil || parseipmask(mask, xt->val, isv4(net)) == -1)
136 ipmove(mask, defmask(net));
137 nprefix = prefixlen(mask);
138 if(nprefix <= prefix && at[nprefix] == nil){
139 /* remember containing subnet, order by prefix length */
145 nt = ndbsnext(&s, "ip", netstr);
147 /* filter subnets, longest prefix first */
148 for(t = nil; prefix >= 0; prefix--){
149 if(at[prefix] != nil)
150 t = ndbconcatenate(t, filter(db, at[prefix], f));
152 ndbsetmalloctag(t, getcallerpc(&db));
157 netinfo(Ndb *db, Ndbtuple *t, char **alist, int n)
159 uchar ip[IPaddrlen], net[IPaddrlen];
160 int prefix, smallestprefix, force;
163 nt = ndbfindattr(t, t, "ip");
164 if(nt == nil || parseip(ip, nt->val) == -1){
169 /* get needed attributes */
170 f = mkfilter(n, alist);
172 t = filter(db, t, f);
175 * now go through subnets to fill in any missing attributes
180 smallestprefix = 100;
183 /* in v6, the last 8 bytes have no structure (we hope) */
191 * to find a containing network, keep turning off
192 * the lower bit and look for a network with
193 * that address and a shorter mask. tedius but
194 * complete, we may need to find a trick to speed this up.
196 for(; prefix >= smallestprefix; prefix--){
197 if(filtercomplete(f))
199 if(!force && (net[prefix/8] & (1<<(7-(prefix%8)))) == 0)
202 net[prefix/8] &= ~(1<<(7-(prefix%8)));
203 t = ndbconcatenate(t, subnet(db, net, f, prefix));
207 * if there's an unfulfilled ipmask, make one up
209 nt = ndbfindattr(f, f, "ipmask");
210 if(nt != nil && !(nt->ptr & Fignore)){
213 snprint(x, sizeof(x), "%M", defmask(ip));
214 nt = ndbnew("ipmask", x);
217 t = ndbconcatenate(t, nt);
221 ndbsetmalloctag(t, getcallerpc(&db));
226 * fill in all the requested attributes for a system.
227 * if the system's entry doesn't have all required,
228 * walk through successively more inclusive networks
229 * for inherited attributes.
232 ndbipinfo(Ndb *db, char *attr, char *val, char **alist, int n)
239 fmtinstall('I', eipfmt);
240 fmtinstall('M', eipfmt);
243 * first look for a matching entry with an ip address
245 ipstr = ndbgetvalue(db, &s, attr, val, "ip", &nt);
247 /* none found, make one up */
248 if(strcmp(attr, "ip") != 0)
250 nt = ndbnew("ip", val);
253 t = netinfo(db, nt, alist, n);
259 nt = ndbreorder(nt, s.t);
260 t = ndbconcatenate(t, netinfo(db, nt, alist, n));
261 } while((nt = ndbsnext(&s, attr, val)) != nil);