You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
24 lines
966 B
Groff
24 lines
966 B
Groff
.TH dns_ip4 3
|
|
.SH NAME
|
|
dns_ip4 \- look up IPv4 addresses
|
|
.SH SYNTAX
|
|
.B #include <dns.h>
|
|
|
|
int \fBdns_ip4\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
|
|
.SH DESCRIPTION
|
|
dns_ip4 looks up 4-byte IP addresses for the fully-qualified domain name in
|
|
\fIfqdn\fR. It puts the concatenation of the IP addresses into \fIout\fR and
|
|
returns 0. If the domain does not exist in DNS, or has no IP addresses,
|
|
\fIout\fR will be empty.
|
|
|
|
If dns_ip4 has trouble with the DNS lookup or runs out of memory, it returns
|
|
-1, setting errno appropriately. It may or may not change \fIout\fR.
|
|
|
|
If \fIfqdn\fR is a dotted-decimal IP address, dns_ip4 puts that IP address into
|
|
\fIout\fR without checking DNS. More generally, if \fIfqdn\fR is a
|
|
dot-separated sequence of dotted-decimal IP addresses, dns_ip4 puts those IP
|
|
addresses into out without checking DNS. Brackets may appear inside the
|
|
dotted-decimal IP addresses; they are ignored.
|
|
.SH "SEE ALSO"
|
|
dns_ip4_packet(3), dns_ip6(3), dns_name4(3)
|