ttestlookup.c - plan9port - [fork] Plan 9 from user space
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ttestlookup.c (3195B)
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1 #include <u.h>
2 #include <libc.h>
3 #include <ip.h>
4 #include <bio.h>
5 #include <ndb.h>
6
7 static uchar noether[6];
8 Ndb *db;
9
10 static void
11 recursesubnet(Ndb *db, uchar *addr, uchar *mask, char *attr, char *name, char *name1)
12 {
13 Ndbs s;
14 Ndbtuple *t, *nt;
15 uchar submask[IPaddrlen], net[IPaddrlen];
16 char ip[Ndbvlen];
17 int found;
18
19 maskip(addr, mask, net);
20 sprint(ip, "%I", net);
21 t = ndbsearch(db, &s, "ip", ip);
22 if(t == 0)
23 return;
24
25 for(nt = t; nt; nt = nt->entry){
26 if(strcmp(nt->attr, "ipmask") == 0){
27 parseip(submask, nt->val);
28 if(memcmp(submask, mask, IPaddrlen) != 0)
29 recursesubnet(db, addr, submask, attr, name, name1);
30 break;
31 }
32 }
33
34 if(name[0] == 0){
35 found = 0;
36 for(nt = t; nt; nt = nt->entry){
37 if(strcmp(nt->attr, attr) == 0){
38 if(found){
39 strcpy(name, nt->val);
40 name1[0] = 0;
41 found = 1;
42 } else {
43 strcpy(name1, nt->val);
44 break;
45 }
46 }
47 }
48 }
49
50 ndbfree(t);
51 }
52
53 /*
54 * lookup an ip address
55 */
56 static int
57 getipaddr(Ndb *db, char *name, uchar *to, Ipinfo *iip)
58 {
59 Ndbtuple *t, *nt;
60 char buf[Ndbvlen];
61 uchar subnet[IPaddrlen];
62 Ndbs s;
63 char *attr;
64
65 attr = ipattr(name);
66 if(strcmp(attr, "ip") == 0){
67 parseip(to, name);
68 return 1;
69 }
70
71 t = ndbgetval(db, &s, attr, name, "ip", buf);
72 if(t){
73 /* first look for match on same subnet */
74 for(nt = t; nt; nt = nt->entry){
75 if(strcmp(nt->attr, "ip") != 0)
76 continue;
77 parseip(to, nt->val);
78 maskip(to, iip->ipmask, subnet);
79 if(memcmp(subnet, iip->ipnet, sizeof(subnet)) == 0)
80 return 1;
81 }
82
83 /* otherwise, just take what we have */
84 ndbfree(t);
85 parseip(to, buf);
86 return 1;
87 }
88 return 0;
89 }
90
91 /*
92 * return the ip addresses for a type of server for system ip
93 */
94 int
95 lookupserver(char *attr, uchar ipaddrs[2][IPaddrlen], Ipinfo *iip)
96 {
97 Ndbtuple *t, *nt;
98 Ndbs s;
99 char ip[32];
100 char name[Ndbvlen];
101 char name1[Ndbvlen];
102 int i;
103
104 name[0] = name1[0] = 0;
105
106 snprint(ip, sizeof(ip), "%I", iip->ipaddr);
107 t = ndbsearch(db, &s, "ip", ip);
108 while(t){
109 for(nt = t; nt; nt = nt->entry){
110 if(strcmp(attr, nt->attr) == 0){
111 if(*name == 0)
112 strcpy(name, nt->val);
113 else {
114 strcpy(name1, nt->val);
115 break;
116 }
117 }
118 }
119 if(name[0])
120 break;
121 t = ndbsnext(&s, "ip", ip);
122 }
123
124 if(name[0] == 0)
125 recursesubnet(db, iip->ipaddr, classmask[CLASS(iip->ipaddr)], attr, name, name1);
126
127 i = 0;
128 if(name[0] && getipaddr(db, name, *ipaddrs, iip) == 1){
129 ipaddrs++;
130 i++;
131 }
132 if(name1[0] && getipaddr(db, name1, *ipaddrs, iip) == 1)
133 i++;
134 return i;
135 }
136
137 void
138 main(int argc, char **argv)
139 {
140 Ipinfo ii;
141 uchar addrs[2][IPaddrlen];
142 int i, j;
143
144 db = ndbopen(0);
145
146 fmtinstall('E', eipconv);
147 fmtinstall('I', eipconv);
148 if(argc < 2)
149 exits(0);
150 if(strchr(argv[1], '.')){
151 if(ipinfo(db, 0, argv[1], 0, &ii) < 0)
152 exits(0);
153 } else {
154 if(ipinfo(db, argv[1], 0, 0, &ii) < 0)
155 exits(0);
156 }
157 print("a %I m %I n %I f %s e %E a %I\n", ii.ipaddr,
158 ii.ipmask, ii.ipnet, ii.bootf, ii.etheraddr, ii.auip);
159
160 i = lookupserver("auth", addrs, &ii);
161 print("lookupserver returns %d\n", i);
162 for(j = 0; j < i; j++)
163 print("%I\n", addrs[j]);
164 i = lookupserver("dns", addrs, &ii);
165 print("lookupserver returns %d\n", i);
166 for(j = 0; j < i; j++)
167 print("%I\n", addrs[j]);
168 }