ref: 556618eb07d1ac6e2c629a60acd53c45d53261be
dir: /sys/src/cmd/ndb/dnsdebug.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ctype.h>
#include <ip.h>
#include <ndb.h>
#include "dns.h"
enum {
Maxrequest= 128,
};
Cfg cfg;
static char *servername;
static RR *serveraddrs;
char *dbfile;
int debug;
char *logfile = "dnsdebug";
int maxage = 60*60;
char mntpt[Maxpath];
int needrefresh;
ulong now;
vlong nowns;
char *trace;
int traceactivity;
char *zonerefreshprogram;
void docmd(int, char**);
void doquery(char*, char*);
void preloadserveraddrs(void);
int setserver(char*);
void squirrelserveraddrs(void);
#pragma varargck type "P" RR*
int prettyrrfmt(Fmt*);
void
usage(void)
{
fprint(2, "%s: [-crdx] [-f db-file] [[@server] domain [type]]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
int n;
Biobuf in;
char *p;
char *f[4];
strcpy(mntpt, "/net");
cfg.inside = 1;
ARGBEGIN{
case 'f':
dbfile = EARGF(usage());
break;
case 'c':
cfg.cachedb = 1;
break;
case 'r':
cfg.resolver = 1;
break;
case 'd':
debug = 1;
traceactivity = 1;
break;
case 'x':
dbfile = "/lib/ndb/external";
strcpy(mntpt, "/net.alt");
break;
default:
usage();
}ARGEND
now = time(nil);
nowns = nsec();
dninit();
fmtinstall('P', prettyrrfmt);
opendatabase();
srand(truerand());
db2cache(1);
if(cfg.resolver)
squirrelserveraddrs();
debug = 1;
if(argc > 0){
docmd(argc, argv);
exits(0);
}
Binit(&in, 0, OREAD);
for(print("> "); p = Brdline(&in, '\n'); print("> ")){
p[Blinelen(&in)-1] = 0;
n = tokenize(p, f, 3);
if(n>=1) {
docmd(n, f);
}
}
exits(0);
}
static char*
longtime(long t)
{
int d, h, m, n;
static char x[128];
for(d = 0; t >= 24*60*60; t -= 24*60*60)
d++;
for(h = 0; t >= 60*60; t -= 60*60)
h++;
for(m = 0; t >= 60; t -= 60)
m++;
n = 0;
if(d)
n += sprint(x, "%d day ", d);
if(h)
n += sprint(x+n, "%d hr ", h);
if(m)
n += sprint(x+n, "%d min ", m);
if(t || n == 0)
sprint(x+n, "%ld sec", t);
return x;
}
int
prettyrrfmt(Fmt *f)
{
int rv;
char *strp, *t, buf[32];
Fmt fstr;
RR *rp;
fmtstrinit(&fstr);
rp = va_arg(f->args, RR*);
fmtprint(&fstr, "%R", rp);
strp = fmtstrflush(&fstr);
if((t = strchr(strp, '\t')) == nil || rp == nil)
rv = fmtstrcpy(f, strp);
else
rv = fmtprint(f, "%-32.32s %-15.15s %-5.5s%s",
rp->owner->name, longtime(rp->ttl),
rrname(rp->type, buf, sizeof buf), t);
free(strp);
return rv;
}
void
logsection(char *flag, RR *rp)
{
if(rp == nil)
return;
print("\t%s%P\n", flag, rp);
for(rp = rp->next; rp != nil; rp = rp->next)
print("\t %P\n", rp);
}
void
logreply(int id, uchar *addr, DNSmsg *mp)
{
RR *rp;
char buf[12], resp[32];
switch(mp->flags & Rmask){
case Rok:
strcpy(resp, "OK");
break;
case Rformat:
strcpy(resp, "Format error");
break;
case Rserver:
strcpy(resp, "Server failed");
break;
case Rname:
strcpy(resp, "Nonexistent");
break;
case Runimplimented:
strcpy(resp, "Unimplemented");
break;
case Rrefused:
strcpy(resp, "Refused");
break;
default:
sprint(resp, "%d", mp->flags & Rmask);
break;
}
print("%d: rcvd %s from %I (%s%s%s%s%s)\n", id, resp, addr,
mp->flags & Fauth? "authoritative": "",
mp->flags & Ftrunc? " truncated": "",
mp->flags & Frecurse? " recurse": "",
mp->flags & Fcanrec? " can_recurse": "",
(mp->flags & (Fauth|Rmask)) == (Fauth|Rname)? " nx": "");
for(rp = mp->qd; rp != nil; rp = rp->next)
print("\tQ: %s %s\n", rp->owner->name,
rrname(rp->type, buf, sizeof buf));
logsection("Ans: ", mp->an);
logsection("Auth: ", mp->ns);
logsection("Hint: ", mp->ar);
}
void
logsend(int id, int subid, uchar *addr, char *sname, char *rname, int type)
{
char buf[12];
print("%d.%d: sending to %I/%s %s %s\n", id, subid,
addr, sname, rname, rrname(type, buf, sizeof buf));
}
RR*
getdnsservers(int class)
{
RR *rr;
if(servername == nil)
return dnsservers(class);
rr = rralloc(Tns);
rr->owner = dnlookup("local#dns#servers", class, 1);
rr->host = idnlookup(servername, class, 1);
return rr;
}
void
squirrelserveraddrs(void)
{
int v4;
char *attr;
RR *rr, *rp, **l;
Request req;
/* look up the resolver address first */
cfg.resolver = 0;
debug = 0;
if(serveraddrs){
rrfreelist(serveraddrs);
serveraddrs = nil;
}
rr = getdnsservers(Cin);
l = &serveraddrs;
for(rp = rr; rp != nil; rp = rp->next){
attr = ipattr(rp->host->name);
v4 = strcmp(attr, "ip") == 0;
if(v4 || strcmp(attr, "ipv6") == 0){
*l = rralloc(v4? Ta: Taaaa);
(*l)->owner = rp->host;
(*l)->ip = rp->host;
l = &(*l)->next;
continue;
}
memset(&req, 0, sizeof req);
req.isslave = 1;
req.aborttime = NS2MS(nowns) + Maxreqtm;
*l = dnresolve(rp->host->name, Cin, Ta, &req, nil, 0, Recurse, 0, nil);
if(*l == nil)
*l = dnresolve(rp->host->name, Cin, Taaaa, &req,
nil, 0, Recurse, 0, nil);
while(*l != nil)
l = &(*l)->next;
}
cfg.resolver = 1;
debug = 1;
}
void
preloadserveraddrs(void)
{
RR *rp, **l, *first;
first = nil;
l = &first;
for(rp = serveraddrs; rp != nil; rp = rp->next){
rrcopy(rp, l);
rrattach(first, Authoritative);
}
}
int
setserver(char *server)
{
if(servername != nil){
free(servername);
servername = nil;
cfg.resolver = 0;
}
if(server == nil || *server == 0)
return 0;
servername = strdup(server);
squirrelserveraddrs();
if(serveraddrs == nil){
print("can't resolve %s\n", servername);
cfg.resolver = 0;
} else
cfg.resolver = 1;
return cfg.resolver? 0: -1;
}
void
doquery(char *name, char *tstr)
{
int len, type, rooted;
char buf[1024];
RR *rr, *rp;
Request req;
if(cfg.resolver)
preloadserveraddrs();
/* default to an "ip" request if alpha, "ptr" if numeric */
if(tstr == nil || *tstr == 0)
if(strcmp(ipattr(name), "ip") == 0)
tstr = "ptr";
else
tstr = "ip";
/* look it up */
type = rrtype(tstr);
if(type < 0){
print("!unknown type %s\n", tstr);
return;
}
/* if name end in '.', remove it */
len = strlen(name);
if(len > 0 && name[len-1] == '.'){
rooted = 1;
name[len-1] = 0;
} else
rooted = 0;
/* inverse queries may need to be permuted */
if(type == Tptr)
mkptrname(name, buf, sizeof buf);
else
strncpy(buf, name, sizeof buf);
memset(&req, 0, sizeof req);
getactivity(&req, 0);
req.isslave = 1;
req.aborttime = NS2MS(nowns) + Maxreqtm;
rr = dnresolve(buf, Cin, type, &req, nil, 0, Recurse, rooted, nil);
if(rr){
print("----------------------------\n");
for(rp = rr; rp; rp = rp->next)
print("answer %P\n", rp);
print("----------------------------\n");
}
rrfreelist(rr);
putactivity(0);
}
void
docmd(int n, char **f)
{
int tmpsrv;
char *name, *type;
name = type = nil;
tmpsrv = 0;
if(strcmp(f[0], "refresh") == 0){
db2cache(1);
dnageall(0);
return;
}
if(*f[0] == '@') {
if(setserver(f[0]+1) < 0)
return;
switch(n){
case 3:
type = f[2];
/* fall through */
case 2:
name = f[1];
tmpsrv = 1;
break;
}
} else
switch(n){
case 2:
type = f[1];
/* fall through */
case 1:
name = f[0];
break;
}
if(name == nil)
return;
if(!cfg.cachedb) dnpurge(); /* flush the cache */
doquery(name, type);
if(tmpsrv)
setserver("");
}