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ndb/dnsgetip: report errors when dns resolution fails

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This commit is contained in:
mischief 2018-07-13 20:44:57 +00:00
parent 96e511d736
commit c5559504cd
1 changed files with 40 additions and 9 deletions
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49
sys/src/cmd/ndb/dnsgetip.c
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@ -18,27 +18,49 @@ int testing = 0;
int traceactivity = 0;
char *zonerefreshprogram;
int aflag;
int aflag = 0;
int addresses = 0;
void
char Ebotch[] = "dns botch";
char*
resolve(char *name, int type)
{
int status;
char *errmsg;
Request req;
RR *rp;
RR *rr, *rp, *neg;
status = Rok;
errmsg = nil;
memset(&req, 0, sizeof req);
getactivity(&req, 0);
req.isslave = 1;
req.aborttime = NS2MS(nowns) + Maxreqtm;
rp = dnresolve(name, Cin, type, &req, 0, 0, Recurse, 0, 0);
rrremneg(&rp);
while(rp != nil){
rr = dnresolve(name, Cin, type, &req, 0, 0, Recurse, 0, &status);
neg = rrremneg(&rr);
if(rr == nil || neg != nil){
if(neg != nil)
status = neg->negrcode;
errmsg = Ebotch;
if(status > 0 && status < nrname)
errmsg = rname[status];
}
rrfreelist(neg);
for(rp = rr; rp != nil; rp = rp->next){
print("%s\n", rp->ip->name);
addresses++;
if(!aflag)
exits(nil);
rp = rp->next;
}
rrfreelist(rr);
return errmsg;
}
void
@ -51,6 +73,8 @@ usage(void)
void
main(int argc, char **argv)
{
char *e4, *e6;
strcpy(mntpt, "/net");
cfg.inside = 1;
cfg.resolver = 1;
@ -76,8 +100,15 @@ main(int argc, char **argv)
print("%s\n", *argv);
else {
dninit();
resolve(*argv, Ta);
resolve(*argv, Taaaa);
e4 = resolve(*argv, Ta);
e6 = resolve(*argv, Taaaa);
if(addresses == 0){
if(e4 == e6)
sysfatal("%s: dns failure: %s", *argv, e4);
sysfatal("%s: dns failure: v4: %s: v6: %s", *argv, e4, e6);
}
}
exits(nil);
}