ref: 498d86b9218287b2b5c16aa54a283249fbd4e5a3
parent: c67593125c93d80c281ee7a52ed81595ce2b7b92
author: cinap_lenrek <[email protected]>
date: Mon Nov 1 12:31:39 EDT 2021
ndb/dnsquery: make ! bang work with reverse lookups, document in ndb(8)
--- a/sys/man/8/ndb
+++ b/sys/man/8/ndb
@@ -683,6 +683,9 @@
.I Ndb/dnsquery
prompts for commands of the form
.IP
+[
+.B !
+]
.I "domain-name request-type"
.LP
where
@@ -700,6 +703,11 @@
will reverse the ip address and tack on the
.B .in-addr.arpa
if necessary.
+If the command starts with an exclamation mark
+.B !
+then the response is returned in
+.IR ndb (6)
+format.
The
.B -x
option switches
@@ -707,7 +715,7 @@
to query the dns server on
.B /net.alt
instead of
-.B /net
+.BR /net .
.PP
.I Ndb/dnsdebug
is like
--- a/sys/src/cmd/ndb/dnsquery.c
+++ b/sys/src/cmd/ndb/dnsquery.c
@@ -53,41 +53,47 @@
query(int fd)
{int n;
- char *lp;
+ char *lp, *bang;
char buf[1024], line[1024];
Biobuf in;
Binit(&in, 0, OREAD);
for(fprint(2, "> "); lp = Brdline(&in, '\n'); fprint(2, "> ")){- n = Blinelen(&in) -1;
- while(isspace(lp[n]))
- lp[n--] = 0;
- n++;
- while(isspace(*lp)){- lp++;
+ n = Blinelen(&in);
+ while(n > 0 && isspace(lp[n-1]))
n--;
+ lp[n] = 0;
+ while(isspace(*lp))
+ lp++;
+ bang = "";
+ while(*lp == '!'){+ bang = "!";
+ lp++;
}
- if(!*lp)
+ while(isspace(*lp))
+ lp++;
+ if(*lp == 0)
continue;
- strcpy(line, lp);
/* default to an "ip" request if alpha, "ptr" if numeric */
- if(strchr(line, ' ') == nil)
- if(strcmp(ipattr(line), "ip") == 0) {- strcat(line, " ptr");
- n += 4;
+ if(strchr(lp, ' ') == nil){+ if(strcmp(ipattr(lp), "ip") == 0) {+ n = snprint(line, sizeof line, "%s ptr", lp);
} else {- strcat(line, " ip");
- n += 3;
+ n = snprint(line, sizeof line, "%s ip", lp);
}
+ } else {+ n = snprint(line, sizeof line, "%s", lp);
+ }
if(n > 4 && strcmp(" ptr", &line[n-4]) == 0){line[n-4] = 0;
mkptrname(line, buf, sizeof buf);
- n = snprint(line, sizeof line, "%s ptr", buf);
+ snprint(line, sizeof line, "%s ptr", buf);
}
- querydns(fd, line, n);
+ n = snprint(buf, sizeof buf, "%s%s", bang, line);
+ querydns(fd, buf, n);
}
Bterm(&in);
}