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authorGuilhem Moulin <guilhem@fripost.org>2020-12-10 15:26:46 +0100
committerGuilhem Moulin <guilhem@fripost.org>2020-12-11 11:20:41 +0100
commit84d1829fd0f955cf9fb7add54f60fc314b0d42b1 (patch)
tree8525a7e966cf29e2a61d83d425f26674531289f0 /lib/Net/IMAP/InterIMAP.pm
parent26e5c04abfb81bdcbd4d89d9f9329b8433920b26 (diff)
libinterimap: factor out hostname/IP parsing.
Also, document that enclosing 'host' value in square brackets forces its interpretation as an IP literal (hence skips name resolution).
Diffstat (limited to 'lib/Net/IMAP/InterIMAP.pm')
-rw-r--r--lib/Net/IMAP/InterIMAP.pm61
1 files changed, 42 insertions, 19 deletions
diff --git a/lib/Net/IMAP/InterIMAP.pm b/lib/Net/IMAP/InterIMAP.pm
index 849dc0f..e3a539d 100644
--- a/lib/Net/IMAP/InterIMAP.pm
+++ b/lib/Net/IMAP/InterIMAP.pm
@@ -1446,23 +1446,39 @@ my $RE_IPv6 = do {
| (?: (?: $h16 : ){0,6} $h16 )? ::
/x };
+# Parse an IPv4 or IPv6. In list context, return a pair (IP, family),
+# otherwise only the IP. If the argument is not an IP (for instance if
+# it's a hostname), then return (undef, undef) resp. undef. The input
+# can optionaly be enclosed in square brackets which forces its
+# interpretation as an IP literal: an error is raised if it is not the
+# case.
+my $RE_IPv4_anchored = qr/\A($RE_IPv4)\z/;
+my $RE_IPv6_anchored = qr/\A($RE_IPv6)\z/;
+sub _parse_hostip($) {
+ my $v = shift // return;
+ my $literal = $v =~ s/\A\[(.*)\]\z/$1/ ? 1 : 0;
+ my ($ip, $af) = $v =~ $RE_IPv4_anchored ? ($1, AF_INET)
+ : $v =~ $RE_IPv6_anchored ? ($1, AF_INET6)
+ : (undef, undef);
+ die "Invalid IP literal: $v\n" if $literal and !defined($ip);
+ return wantarray ? ($ip, $af) : $ip;
+}
# Opens a TCP socket to the given $host and $port.
sub _tcp_connect($$$) {
my ($self, $host, $port) = @_;
my %hints = (socktype => SOCK_STREAM, protocol => IPPROTO_TCP);
- if ($host =~ qr/\A$RE_IPv4\z/) {
- $hints{family} = AF_INET;
- $hints{flags} |= AI_NUMERICHOST;
- } elsif ($host =~ qr/\A\[($RE_IPv6)\]\z/) {
- $host = $1;
- $hints{family} = AF_INET6;
+ my ($host2, $family) = _parse_hostip($host);
+ if (defined $family) {
+ $hints{family} = $family;
$hints{flags} |= AI_NUMERICHOST;
+ } else {
+ $host2 = $host;
}
- my ($err, @res) = getaddrinfo($host, $port, \%hints);
- $self->fail("Can't getaddrinfo: $err") if $err ne '';
+ my ($err, @res) = getaddrinfo($host2, $port, \%hints);
+ $self->fail("getaddrinfo($host2): $err") if $err ne '';
SOCKETS:
foreach my $ai (@res) {
@@ -1520,7 +1536,7 @@ sub _proxify($$$$) {
$port = getservbyname($port, 'tcp') // $self->fail("Can't getservbyname $port")
unless $port =~ /\A[0-9]+\z/;
- $proxy =~ /\A([A-Za-z0-9]+):\/\/(\P{Control}*\@)?($RE_IPv4|\[$RE_IPv6\]|[^:]+)(:[A-Za-z0-9]+)?\z/
+ $proxy =~ /\A([A-Za-z0-9]+):\/\/(\P{Control}*\@)?([^:]+|\[[^\]]+\])(:[A-Za-z0-9]+)?\z/
or $self->fail("Invalid proxy URI $proxy");
my ($proto, $userpass, $proxyhost, $proxyport) = ($1, $2, $3, $4);
$userpass =~ s/\@\z// if defined $userpass;
@@ -1553,23 +1569,30 @@ sub _proxify($$$$) {
$self->fail('SOCKSv5', 'No acceptable authentication methods');
}
- if ($host !~ /\A(?:$RE_IPv4|\[$RE_IPv6\])\z/ and !$resolv) {
+ my ($hostip, $fam) = _parse_hostip($host);
+ unless (defined($fam) or $resolv) {
# resove the hostname $host locally
my ($err, @res) = getaddrinfo($host, undef, {socktype => SOCK_RAW});
- $self->fail("Can't getaddrinfo: $err") if $err ne '';
- ($host) = first { defined $_ } map {
+ $self->fail("getaddrinfo($host): $err") if $err ne '';
+ my ($addr) = first { defined($_) } map {
my ($err, $ipaddr) = getnameinfo($_->{addr}, NI_NUMERICHOST, NIx_NOSERV);
- $err eq '' ? $ipaddr : undef
+ $err eq '' ? [$ipaddr,$_->{family}] : undef
} @res;
- $self->fail("Can't getnameinfo") unless defined $host;
+ $self->fail("Can't getnameinfo") unless defined $addr;
+ ($hostip, $fam) = @$addr;
}
# send a CONNECT command (CMD 0x01)
- my ($typ, $addr) =
- $host =~ /\A$RE_IPv4\z/ ? (0x01, Socket::inet_pton(AF_INET, $host))
- : ($host =~ /\A\[($RE_IPv6)\]\z/ or $host =~ /\A($RE_IPv6)\z/) ? (0x04, Socket::inet_pton(AF_INET6, $1))
- : (0x03, pack('C',length($host)).$host);
- $self->_xwrite($socket, pack('C4', $v, 0x01, 0x00, $typ).$addr.pack('n', $port));
+ my ($typ, $addr);
+ if (defined $fam) {
+ $typ = $fam == AF_INET ? 0x01 : $fam == AF_INET6 ? 0x04 : $self->panic();
+ $addr = Socket::inet_pton($fam, $hostip);
+ } else {
+ # let the SOCKS server do the resolution
+ $typ = 0x03;
+ $addr = pack('C',length($host)) . $host;
+ }
+ $self->_xwrite($socket, pack('C4', $v, 0x01, 0x00, $typ) . $addr . pack('n', $port));
($v2, my $r, my $rsv, $typ) = unpack('C4', $self->_xread($socket, 4));
$self->fail('SOCKSv5', 'Invalid protocol') unless $v == $v2 and $rsv == 0x00;