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.TH dns_ip4 3
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.SH NAME
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dns_ip4 \- look up IPv4 addresses
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.SH SYNTAX
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.B #include <libowfat/dns.h>
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int \fBdns_ip4\fP(stralloc* \fIout\fR,stralloc* \fIfqdn\fR);
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.SH DESCRIPTION
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dns_ip4 looks up 4-byte IP addresses for the fully-qualified domain name in
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\fIfqdn\fR. It puts the concatenation of the IP addresses into \fIout\fR and
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returns 0. If the domain does not exist in DNS, or has no IP addresses,
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\fIout\fR will be empty.
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If dns_ip4 has trouble with the DNS lookup or runs out of memory, it returns
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-1, setting errno appropriately. It may or may not change \fIout\fR.
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If \fIfqdn\fR is a dotted-decimal IP address, dns_ip4 puts that IP address into
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\fIout\fR without checking DNS. More generally, if \fIfqdn\fR is a
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dot-separated sequence of dotted-decimal IP addresses, dns_ip4 puts those IP
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addresses into out without checking DNS. Brackets may appear inside the
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dotted-decimal IP addresses; they are ignored.
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.SH "SEE ALSO"
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dns_ip4_packet(3), dns_ip6(3), dns_name4(3)
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