ref: 15d1425b276495a82621a8d075176a59a512cdf3
dir: /sys/src/cmd/ndb/dnarea.c/
#include <u.h> #include <libc.h> #include <bio.h> #include <ndb.h> #include <ip.h> #include "dns.h" Area *owned, *delegated; static Area* nameinarea(char *name, Area *s) { int len; for(len = strlen(name); s != nil; s = s->next){ if(s->len > len) continue; if(cistrcmp(s->soarr->owner->name, name + len - s->len) == 0) if(len == s->len || name[len - s->len - 1] == '.') return s; } return nil; } /* * true if a name is in our area */ Area* inmyarea(char *name) { Area *s, *d; s = nameinarea(name, owned); if(s == nil) return nil; d = nameinarea(name, delegated); if(d && d->len > s->len) return nil; return s; /* name is in owned area `s' and not in a delegated subarea */ } /* * our area is the part of the domain tree that * we serve */ void addarea(RR *rp, Ndbtuple *t) { DN *dp; Area *s; Area **l; int len; dp = rp->owner; len = strlen(dp->name); if(t->val[0]) l = &delegated; else l = &owned; for (s = *l; s != nil; l = &s->next, s = s->next){ if(s->len < len) break; if(s->soarr->owner == dp) return; /* we've already got one */ } /* * The area contains a copy of the soa rr that created it. * The owner of the the soa rr should stick around as long * as the area does. */ s = emalloc(sizeof(*s)); s->len = len; rrcopy(rp, &s->soarr); s->neednotify = 1; s->needrefresh = 0; if (debug) dnslog("new area %s %s", dp->name, l == &delegated? "delegated": "owned"); s->next = *l; *l = s; } void freeareas(Area **l) { Area *s; while(s = *l){ *l = s->next; rrfree(s->soarr); memset(s, 0, sizeof *s); /* cause trouble */ free(s); } }