1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include <ndb.h>
5 #include <ip.h>
6 #include "dns.h"
7 
8 Area *owned;
9 Area *delegated;
10 
11 /*
12  *  true if a name is in our area
13  */
14 Area*
15 inmyarea(char *name)
16 {
17 	int len;
18 	Area *s, *d;
19 
20 	len = strlen(name);
21 	for(s = owned; s; s = s->next){
22 		if(s->len > len)
23 			continue;
24 		if(cistrcmp(s->soarr->owner->name, name + len - s->len) == 0)
25 			if(len == s->len || name[len - s->len - 1] == '.')
26 				break;
27 	}
28 	if(s == 0)
29 		return 0;
30 
31 	for(d = delegated; d; d = d->next){
32 		if(d->len > len)
33 			continue;
34 		if(cistrcmp(d->soarr->owner->name, name + len - d->len) == 0)
35 			if(len == d->len || name[len - d->len - 1] == '.')
36 				return 0;
37 	}
38 
39 	return s;
40 }
41 
42 /*
43  *  our area is the part of the domain tree that
44  *  we serve
45  */
46 void
47 addarea(DN *dp, RR *rp, Ndbtuple *t)
48 {
49 	Area **l, *s;
50 
51 	if(t->val[0])
52 		l = &delegated;
53 	else
54 		l = &owned;
55 
56 	/*
57 	 *  The area contains a copy of the soa rr that created it.
58 	 *  The owner of the the soa rr should stick around as long
59 	 *  as the area does.
60 	 */
61 	s = emalloc(sizeof(*s));
62 	s->len = strlen(dp->name);
63 	rrcopy(rp, &s->soarr);
64 	s->soarr->owner = dp;
65 	s->soarr->db = 1;
66 	s->soarr->ttl = Hour;
67 	s->neednotify = 1;
68 	s->needrefresh = 0;
69 
70 syslog(0, logfile, "new area %s", dp->name);
71 
72 	s->next = *l;
73 	*l = s;
74 }
75 
76 void
77 freearea(Area **l)
78 {
79 	Area *s;
80 
81 	while(s = *l){
82 		*l = s->next;
83 		rrfree(s->soarr);
84 		free(s);
85 	}
86 }
87 
88 /*
89  * refresh all areas that need it
90  *  this entails running a command 'zonerefreshprogram'.  This could
91  *  copy over databases from elsewhere or just do a zone transfer.
92  */
93 void
94 refresh_areas(Area *s)
95 {
96 	int pid;
97 	Waitmsg *w;
98 
99 	for(; s != nil; s = s->next){
100 		if(!s->needrefresh)
101 			continue;
102 
103 		if(zonerefreshprogram == nil){
104 			s->needrefresh = 0;
105 			continue;
106 		}
107 
108 		switch(pid = fork()){
109 		case -1:
110 			break;
111 		case 0:
112 			execl(zonerefreshprogram, "zonerefresh", s->soarr->owner->name, 0);
113 			exits(0);
114 			break;
115 		default:
116 			for(;;){
117 				w = wait();
118 				if(w == nil)
119 					break;
120 				if(w->pid == pid){
121 					if(w->msg == nil || *w->msg == 0)
122 						s->needrefresh = 0;
123 					free(w);
124 					break;
125 				}
126 				free(w);
127 			}
128 		}
129 	}
130 }