From FEDORA_PATCHES Mon Sep 17 00:00:00 2001

From: Sergio Durigan Junior <sergiodj@redhat.com>

Date: Fri, 18 May 2018 01:29:24 -0400

Subject: gdb-rhbz881849-ipv6-1of3.patch

;; Implement IPv6 support for GDB/gdbserver (RH BZ 881849, Sergio Durigan Junior).

Implement IPv6 support for GDB/gdbserver

This patch implements IPv6 support for both GDB and gdbserver.  Based

on my research, it is the fourth attempt to do that since 2006.  Since

I used ideas from all of the previous patches, I also added their

authors's names on the ChangeLogs as a way to recognize their

efforts.  For reference sake, you can find the previous attempts at:

  https://sourceware.org/ml/gdb-patches/2006-09/msg00192.html

  https://sourceware.org/ml/gdb-patches/2014-02/msg00248.html

  https://sourceware.org/ml/gdb-patches/2016-02/msg00226.html

The basic idea behind the patch is to start using the new

'getaddrinfo'/'getnameinfo' calls, which are responsible for

translating names and addresses in a protocol-independent way.  This

means that if we ever have a new version of the IP protocol, we won't

need to change the code again (or, at least, won't have to change the

majority of the code).

The function 'getaddrinfo' returns a linked list of possible addresses

to connect to.  Dealing with multiple addresses proved to be a hard

task with the current TCP auto-retry mechanism implemented on

ser-tcp:net_open.  For example, when gdbserver listened only on an

IPv4 socket:

  $ ./gdbserver --once 127.0.0.1:1234 ./a.out

and GDB was instructed to try to connect to both IPv6 and IPv4

sockets:

  $ ./gdb -ex 'target extended-remote localhost:1234' ./a.out

the user would notice a somewhat big delay before GDB was able to

connect to the IPv4 socket.  This happened because GDB was trying to

connect to the IPv6 socket first, and had to wait until the connection

timed out before it tried to connect to the IPv4 socket.

For that reason, I had to rewrite the main loop and implement a new

method for handling multiple connections.  After some discussion,

Pedro and I agreed on the following algorithm:

  1) For each entry returned by 'getaddrinfo', we try to open a socket

  and connect to it.

  2.a) If we have a successful 'connect', we just use that connection.

  2.b) If we don't have a successfull 'connect', but if we've got a

  ECONNREFUSED (meaning the the connection was refused), we keep track

  of this fact by using a flag.

  2.c) If we don't have a successfull 'connect', but if we've got a

  EINPROGRESS (meaning that the connection is in progress), we perform

  a 'select' call on the socket until we have a result (either a

  successful connection, or an error on the socket).

  3) If tcp_auto_retry is true, and we haven't gotten a successful

  connection, and at least one of our attempts failed with

  ECONNREFUSED, then we wait a little bit (i.e., call

  'wait_for_connect'), check to see if there was a

  timeout/interruption (in which case we bail out), and then go back

  to (1).

After multiple tests, I was able to connect without delay on the

scenario described above, and was also able to connect in all other

types of scenarios.

I also implemented some hostname parsing functions (along with their

corresponding unit tests) which are used to help GDB and gdbserver to

parse hostname strings provided by the user.  These new functions are

living inside common/netstuff.[ch].  I've had to do that since IPv6

introduces a new URL scheme, which defines that square brackets can be

used to enclose the host part and differentiate it from the

port (e.g., "[::1]:1234" means "host ::1, port 1234").  I spent some

time thinking about a reasonable way to interpret what the user wants,

and I came up with the following:

  - If the user has provided a prefix that doesn't specify the protocol

    version (i.e., "tcp:" or "udp:"), or if the user has not provided

    any prefix, don't make any assumptions (i.e., assume AF_UNSPEC when

    dealing with 'getaddrinfo') *unless* the host starts with "[" (in

    which case, assume it's an IPv6 host).

  - If the user has provided a prefix that does specify the protocol

    version (i.e., "tcp4:", "tcp6:", "udp4:" or "udp6:"), then respect

    that.

This method doesn't follow strictly what RFC 2732 proposes (that

literal IPv6 addresses should be provided enclosed in "[" and "]")

because IPv6 addresses still can be provided without square brackets

in our case, but since we have prefixes to specify protocol versions I

think this is not an issue.

Another thing worth mentioning is the new 'GDB_TEST_SOCKETHOST'

testcase parameter, which makes it possible to specify the

hostname (without the port) to be used when testing GDB and

gdbserver.  For example, to run IPv6 tests:

  $ make check-gdb RUNTESTFLAGS='GDB_TEST_SOCKETHOST=tcp6:[::1]'

Or, to run IPv4 tests:

  $ make check-gdb RUNTESTFLAGS='GDB_TEST_SOCKETHOST=tcp4:127.0.0.1'

This required a few changes on the gdbserver-base.exp, and also a

minimal adjustment on gdb.server/run-without-local-binary.exp.

Finally, I've implemented a new testcase,

gdb.server/server-connect.exp, which is supposed to run on the native

host and perform various "smoke tests" using different connection

methods.

This patch has been regression-tested on BuildBot and locally, and

also built using a x86_64-w64-mingw32 GCC, and no problems were found.

gdb/ChangeLog:

2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	    Paul Fertser  <fercerpav@gmail.com>

	    Tsutomu Seki  <sekiriki@gmail.com>

	    Pedro Alves  <palves@redhat.com>

	* Makefile.in (SUBDIR_UNITTESTS_SRCS): Add

	'unittests/parse-connection-spec-selftests.c'.

	(COMMON_SFILES): Add 'common/netstuff.c'.

	(HFILES_NO_SRCDIR): Add 'common/netstuff.h'.

	* NEWS (Changes since GDB 8.2): Mention IPv6 support.

	* common/netstuff.c: New file.

	* common/netstuff.h: New file.

	* ser-tcp.c: Include 'netstuff.h' and 'wspiapi.h'.

	(wait_for_connect): Update comment.  New parameter

	'gdb::optional<int> sock' instead of 'struct serial *scb'.

	Use 'sock' directly instead of 'scb->fd'.

	(try_connect): New function, with code from 'net_open'.

	(net_open): Rewrite main loop to deal with multiple

	sockets/addresses.  Handle IPv6-style hostnames; implement

	support for IPv6 connections.

	* unittests/parse-connection-spec-selftests.c: New file.

gdb/gdbserver/ChangeLog:

2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	    Paul Fertser  <fercerpav@gmail.com>

	    Tsutomu Seki  <sekiriki@gmail.com>

	* Makefile.in (SFILES): Add '$(srcdir)/common/netstuff.c'.

	(OBS): Add 'common/netstuff.o'.

	(GDBREPLAY_OBS): Likewise.

	* gdbreplay.c: Include 'wspiapi.h' and 'netstuff.h'.

	(remote_open): Implement support for IPv6

	connections.

	* remote-utils.c: Include 'netstuff.h', 'filestuff.h'

	and 'wspiapi.h'.

	(handle_accept_event): Accept connections from IPv6 sources.

	(remote_prepare): Handle IPv6-style hostnames; implement

	support for IPv6 connections.

	(remote_open): Implement support for printing connections from

	IPv6 sources.

gdb/testsuite/ChangeLog:

2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	    Paul Fertser  <fercerpav@gmail.com>

	    Tsutomu Seki  <sekiriki@gmail.com>

	* README (Testsuite Parameters): Mention new 'GDB_TEST_SOCKETHOST'

	parameter.

	* boards/native-extended-gdbserver.exp: Do not set 'sockethost'

	by default.

	* boards/native-gdbserver.exp: Likewise.

	* gdb.server/run-without-local-binary.exp: Improve regexp used

	for detecting when a remote debugging connection succeeds.

	* gdb.server/server-connect.exp: New file.

	* lib/gdbserver-support.exp (gdbserver_default_get_comm_port):

	Do not prefix the port number with ":".

	(gdbserver_start): New global GDB_TEST_SOCKETHOST.  Implement

	support for detecting and using it.  Add '$debughost_gdbserver'

	to the list of arguments used to start gdbserver.  Handle case

	when gdbserver cannot resolve a network name.

gdb/doc/ChangeLog:

2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

	    Jan Kratochvil  <jan.kratochvil@redhat.com>

	    Paul Fertser  <fercerpav@gmail.com>

	    Tsutomu Seki  <sekiriki@gmail.com>

	* gdb.texinfo (Remote Connection Commands): Add explanation

	about new IPv6 support.  Add new connection prefixes.

diff --git a/gdb/Makefile.in b/gdb/Makefile.in

--- a/gdb/Makefile.in

+++ b/gdb/Makefile.in

@@ -430,6 +430,7 @@ SUBDIR_UNITTESTS_SRCS = \

 	unittests/offset-type-selftests.c \

 	unittests/observable-selftests.c \

 	unittests/optional-selftests.c \

+	unittests/parse-connection-spec-selftests.c \

 	unittests/ptid-selftests.c \

 	unittests/rsp-low-selftests.c \

 	unittests/scoped_fd-selftests.c \

@@ -967,6 +968,7 @@ COMMON_SFILES = \

 	common/job-control.c \

 	common/gdb_tilde_expand.c \

 	common/gdb_vecs.c \

+	common/netstuff.c \

 	common/new-op.c \

 	common/pathstuff.c \

 	common/print-utils.c \

@@ -1448,6 +1450,7 @@ HFILES_NO_SRCDIR = \

 	common/gdb_vecs.h \

 	common/gdb_wait.h \

 	common/common-inferior.h \

+	common/netstuff.h \

 	common/host-defs.h \

 	common/pathstuff.h \

 	common/print-utils.h \

diff --git a/gdb/NEWS b/gdb/NEWS

--- a/gdb/NEWS

+++ b/gdb/NEWS

@@ -1,6 +1,12 @@

 		What has changed in GDB?

 	     (Organized release by release)

+*** Changes since GDB 8.2

+

+* GDB and GDBserver now support IPv6 connections.  IPv6 addresses

+  can be passed using the '[ADDRESS]:PORT' notation, or the regular

+  'ADDRESS:PORT' method.

+

 *** Changes in GDB 8.2

 * The 'set disassembler-options' command now supports specifying options

diff --git a/gdb/common/netstuff.c b/gdb/common/netstuff.c

new file mode 100644

--- /dev/null

+++ b/gdb/common/netstuff.c

@@ -0,0 +1,155 @@

+/* Operations on network stuff.

+   Copyright (C) 2018 Free Software Foundation, Inc.

+

+   This file is part of GDB.

+

+   This program is free software; you can redistribute it and/or modify

+   it under the terms of the GNU General Public License as published by

+   the Free Software Foundation; either version 3 of the License, or

+   (at your option) any later version.

+

+   This program is distributed in the hope that it will be useful,

+   but WITHOUT ANY WARRANTY; without even the implied warranty of

+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+   GNU General Public License for more details.

+

+   You should have received a copy of the GNU General Public License

+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

+

+#include "common-defs.h"

+#include "netstuff.h"

+#include <algorithm>

+

+#ifdef USE_WIN32API

+#include <winsock2.h>

+#include <wspiapi.h>

+#else

+#include <netinet/in.h>

+#include <arpa/inet.h>

+#include <netdb.h>

+#include <sys/socket.h>

+#include <netinet/tcp.h>

+#endif

+

+/* See common/netstuff.h.  */

+

+scoped_free_addrinfo::~scoped_free_addrinfo ()

+{

+  freeaddrinfo (m_res);

+}

+

+/* See common/netstuff.h.  */

+

+parsed_connection_spec

+parse_connection_spec_without_prefix (std::string spec, struct addrinfo *hint)

+{

+  parsed_connection_spec ret;

+  size_t last_colon_pos = 0;

+  /* We're dealing with IPv6 if:

+

+     - ai_family is AF_INET6, or

+     - ai_family is not AF_INET, and

+       - spec[0] is '[', or

+       - the number of ':' on spec is greater than 1.  */

+  bool is_ipv6 = (hint->ai_family == AF_INET6

+		  || (hint->ai_family != AF_INET

+		      && (spec[0] == '['

+			  || std::count (spec.begin (),

+					 spec.end (), ':') > 1)));

+

+  if (is_ipv6)

+    {

+      if (spec[0] == '[')

+	{

+	  /* IPv6 addresses can be written as '[ADDR]:PORT', and we

+	     support this notation.  */

+	  size_t close_bracket_pos = spec.find_first_of (']');

+

+	  if (close_bracket_pos == std::string::npos)

+	    error (_("Missing close bracket in hostname '%s'"),

+		   spec.c_str ());

+

+	  hint->ai_family = AF_INET6;

+

+	  const char c = spec[close_bracket_pos + 1];

+

+	  if (c == '\0')

+	    last_colon_pos = std::string::npos;

+	  else if (c != ':')

+	    error (_("Invalid cruft after close bracket in '%s'"),

+		   spec.c_str ());

+

+	  /* Erase both '[' and ']'.  */

+	  spec.erase (0, 1);

+	  spec.erase (close_bracket_pos - 1, 1);

+	}

+      else if (spec.find_first_of (']') != std::string::npos)

+	error (_("Missing open bracket in hostname '%s'"),

+	       spec.c_str ());

+    }

+

+  if (last_colon_pos == 0)

+    last_colon_pos = spec.find_last_of (':');

+

+  /* The length of the hostname part.  */

+  size_t host_len;

+

+  if (last_colon_pos != std::string::npos)

+    {

+      /* The user has provided a port.  */

+      host_len = last_colon_pos;

+      ret.port_str = spec.substr (last_colon_pos + 1);

+    }

+  else

+    host_len = spec.size ();

+

+  ret.host_str = spec.substr (0, host_len);

+

+  /* Default hostname is localhost.  */

+  if (ret.host_str.empty ())

+    ret.host_str = "localhost";

+

+  return ret;

+}

+

+/* See common/netstuff.h.  */

+

+parsed_connection_spec

+parse_connection_spec (const char *spec, struct addrinfo *hint)

+{

+  /* Struct to hold the association between valid prefixes, their

+     family and socktype.  */

+  struct host_prefix

+    {

+      /* The prefix.  */

+      const char *prefix;

+

+      /* The 'ai_family'.  */

+      int family;

+

+      /* The 'ai_socktype'.  */

+      int socktype;

+    };

+  static const struct host_prefix prefixes[] =

+    {

+      { "udp:",  AF_UNSPEC, SOCK_DGRAM },

+      { "tcp:",  AF_UNSPEC, SOCK_STREAM },

+      { "udp4:", AF_INET,   SOCK_DGRAM },

+      { "tcp4:", AF_INET,   SOCK_STREAM },

+      { "udp6:", AF_INET6,  SOCK_DGRAM },

+      { "tcp6:", AF_INET6,  SOCK_STREAM },

+    };

+

+  for (const host_prefix prefix : prefixes)

+    if (startswith (spec, prefix.prefix))

+      {

+	spec += strlen (prefix.prefix);

+	hint->ai_family = prefix.family;

+	hint->ai_socktype = prefix.socktype;

+	hint->ai_protocol

+	  = hint->ai_socktype == SOCK_DGRAM ? IPPROTO_UDP : IPPROTO_TCP;

+	break;

+      }

+

+  return parse_connection_spec_without_prefix (spec, hint);

+}

diff --git a/gdb/common/netstuff.h b/gdb/common/netstuff.h

new file mode 100644

--- /dev/null

+++ b/gdb/common/netstuff.h

@@ -0,0 +1,76 @@

+/* Operations on network stuff.

+   Copyright (C) 2018 Free Software Foundation, Inc.

+

+   This file is part of GDB.

+

+   This program is free software; you can redistribute it and/or modify

+   it under the terms of the GNU General Public License as published by

+   the Free Software Foundation; either version 3 of the License, or

+   (at your option) any later version.

+

+   This program is distributed in the hope that it will be useful,

+   but WITHOUT ANY WARRANTY; without even the implied warranty of

+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+   GNU General Public License for more details.

+

+   You should have received a copy of the GNU General Public License

+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

+

+#ifndef NETSTUFF_H

+#define NETSTUFF_H

+

+#include <string>

+

+/* Like NI_MAXHOST/NI_MAXSERV, but enough for numeric forms.  */

+#define GDB_NI_MAX_ADDR 64

+#define GDB_NI_MAX_PORT 16

+

+/* Helper class to guarantee that we always call 'freeaddrinfo'.  */

+

+class scoped_free_addrinfo

+{

+public:

+  /* Default constructor.  */

+  explicit scoped_free_addrinfo (struct addrinfo *ainfo)

+    : m_res (ainfo)

+  {

+  }

+

+  /* Destructor responsible for free'ing M_RES by calling

+     'freeaddrinfo'.  */

+  ~scoped_free_addrinfo ();

+

+  DISABLE_COPY_AND_ASSIGN (scoped_free_addrinfo);

+

+private:

+  /* The addrinfo resource.  */

+  struct addrinfo *m_res;

+};

+

+/* The struct we return after parsing the connection spec.  */

+

+struct parsed_connection_spec

+{

+  /* The hostname.  */

+  std::string host_str;

+

+  /* The port, if any.  */

+  std::string port_str;

+};

+

+

+/* Parse SPEC (which is a string in the form of "ADDR:PORT") and

+   return a 'parsed_connection_spec' structure with the proper fields

+   filled in.  Also adjust HINT accordingly.  */

+extern parsed_connection_spec

+  parse_connection_spec_without_prefix (std::string spec,

+					struct addrinfo *hint);

+

+/* Parse SPEC (which is a string in the form of

+   "[tcp[6]:|udp[6]:]ADDR:PORT") and return a 'parsed_connection_spec'

+   structure with the proper fields filled in.  Also adjust HINT

+   accordingly.  */

+extern parsed_connection_spec parse_connection_spec (const char *spec,

+						     struct addrinfo *hint);

+

+#endif /* ! NETSTUFF_H */

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog

--- a/gdb/doc/ChangeLog

+++ b/gdb/doc/ChangeLog

@@ -1,3 +1,11 @@

+2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

+	    Jan Kratochvil  <jan.kratochvil@redhat.com>

+	    Paul Fertser  <fercerpav@gmail.com>

+	    Tsutomu Seki  <sekiriki@gmail.com>

+

+	* gdb.texinfo (Remote Connection Commands): Add explanation

+	about new IPv6 support.  Add new connection prefixes.

+

 2018-08-21  Alan Hayward  <alan.hayward@arm.com>

 	* gdb.texinfo (AArch64 SVE): New subsubsection.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo

--- a/gdb/doc/gdb.texinfo

+++ b/gdb/doc/gdb.texinfo

@@ -20548,16 +20548,27 @@ If you're using a serial line, you may want to give @value{GDBN} the

 @code{target} command.

 @item target remote @code{@var{host}:@var{port}}

+@itemx target remote @code{@var{[host]}:@var{port}}

 @itemx target remote @code{tcp:@var{host}:@var{port}}

+@itemx target remote @code{tcp:@var{[host]}:@var{port}}

+@itemx target remote @code{tcp4:@var{host}:@var{port}}

+@itemx target remote @code{tcp6:@var{host}:@var{port}}

+@itemx target remote @code{tcp6:@var{[host]}:@var{port}}

 @itemx target extended-remote @code{@var{host}:@var{port}}

+@itemx target extended-remote @code{@var{[host]}:@var{port}}

 @itemx target extended-remote @code{tcp:@var{host}:@var{port}}

+@itemx target extended-remote @code{tcp:@var{[host]}:@var{port}}

+@itemx target extended-remote @code{tcp4:@var{host}:@var{port}}

+@itemx target extended-remote @code{tcp6:@var{host}:@var{port}}

+@itemx target extended-remote @code{tcp6:@var{[host]}:@var{port}}

 @cindex @acronym{TCP} port, @code{target remote}

 Debug using a @acronym{TCP} connection to @var{port} on @var{host}.

-The @var{host} may be either a host name or a numeric @acronym{IP}

-address; @var{port} must be a decimal number.  The @var{host} could be

-the target machine itself, if it is directly connected to the net, or

-it might be a terminal server which in turn has a serial line to the

-target.

+The @var{host} may be either a host name, a numeric @acronym{IPv4}

+address, or a numeric @acronym{IPv6} address (with or without the

+square brackets to separate the address from the port); @var{port}

+must be a decimal number.  The @var{host} could be the target machine

+itself, if it is directly connected to the net, or it might be a

+terminal server which in turn has a serial line to the target.

 For example, to connect to port 2828 on a terminal server named

 @code{manyfarms}:

@@ -20566,6 +20577,28 @@ For example, to connect to port 2828 on a terminal server named

 target remote manyfarms:2828

 @end smallexample

+To connect to port 2828 on a terminal server whose address is

+@code{2001:0db8:85a3:0000:0000:8a2e:0370:7334}, you can either use the

+square bracket syntax:

+

+@smallexample

+target remote [2001:0db8:85a3:0000:0000:8a2e:0370:7334]:2828

+@end smallexample

+

+@noindent

+or explicitly specify the @acronym{IPv6} protocol:

+

+@smallexample

+target remote tcp6:2001:0db8:85a3:0000:0000:8a2e:0370:7334:2828

+@end smallexample

+

+This last example may be confusing to the reader, because there is no

+visible separation between the hostname and the port number.

+Therefore, we recommend the user to provide @acronym{IPv6} addresses

+using square brackets for clarity.  However, it is important to

+mention that for @value{GDBN} there is no ambiguity: the number after

+the last colon is considered to be the port number.

+

 If your remote target is actually running on the same machine as your

 debugger session (e.g.@: a simulator for your target running on the

 same host), you can omit the hostname.  For example, to connect to

@@ -20579,7 +20612,15 @@ target remote :1234

 Note that the colon is still required here.

 @item target remote @code{udp:@var{host}:@var{port}}

+@itemx target remote @code{udp:@var{[host]}:@var{port}}

+@itemx target remote @code{udp4:@var{host}:@var{port}}

+@itemx target remote @code{udp6:@var{[host]}:@var{port}}

+@itemx target extended-remote @code{udp:@var{host}:@var{port}}

 @itemx target extended-remote @code{udp:@var{host}:@var{port}}

+@itemx target extended-remote @code{udp:@var{[host]}:@var{port}}

+@itemx target extended-remote @code{udp4:@var{host}:@var{port}}

+@itemx target extended-remote @code{udp6:@var{host}:@var{port}}

+@itemx target extended-remote @code{udp6:@var{[host]}:@var{port}}

 @cindex @acronym{UDP} port, @code{target remote}

 Debug using @acronym{UDP} packets to @var{port} on @var{host}.  For example, to

 connect to @acronym{UDP} port 2828 on a terminal server named @code{manyfarms}:

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog

--- a/gdb/gdbserver/ChangeLog

+++ b/gdb/gdbserver/ChangeLog

@@ -1,3 +1,22 @@

+2018-07-11  Sergio Durigan Junior  <sergiodj@redhat.com>

+	    Jan Kratochvil  <jan.kratochvil@redhat.com>

+	    Paul Fertser  <fercerpav@gmail.com>

+	    Tsutomu Seki  <sekiriki@gmail.com>

+

+	* Makefile.in (SFILES): Add '$(srcdir)/common/netstuff.c'.

+	(OBS): Add 'common/netstuff.o'.

+	(GDBREPLAY_OBS): Likewise.

+	* gdbreplay.c: Include 'wspiapi.h' and 'netstuff.h'.

+	(remote_open): Implement support for IPv6

+	connections.

+	* remote-utils.c: Include 'netstuff.h', 'filestuff.h'

+	and 'wspiapi.h'.

+	(handle_accept_event): Accept connections from IPv6 sources.

+	(remote_prepare): Handle IPv6-style hostnames; implement

+	support for IPv6 connections.

+	(remote_open): Implement support for printing connections from

+	IPv6 sources.

+

 2018-08-26  Simon Marchi  <simon.marchi@ericsson.com>

 	PR gdb/23374

diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in

--- a/gdb/gdbserver/Makefile.in

+++ b/gdb/gdbserver/Makefile.in

@@ -211,6 +211,7 @@ SFILES = \

 	$(srcdir)/common/job-control.c \

 	$(srcdir)/common/gdb_tilde_expand.c \

 	$(srcdir)/common/gdb_vecs.c \

+	$(srcdir)/common/netstuff.c \

 	$(srcdir)/common/new-op.c \

 	$(srcdir)/common/pathstuff.c \

 	$(srcdir)/common/print-utils.c \

@@ -254,6 +255,7 @@ OBS = \

 	common/format.o \

 	common/gdb_tilde_expand.o \

 	common/gdb_vecs.o \

+	common/netstuff.o \

 	common/new-op.o \

 	common/pathstuff.o \

 	common/print-utils.o \

@@ -290,6 +292,7 @@ GDBREPLAY_OBS = \

 	common/common-exceptions.o \

 	common/common-utils.o \

 	common/errors.o \

+	common/netstuff.o \

 	common/print-utils.o \

 	gdbreplay.o \

 	utils.o \

diff --git a/gdb/gdbserver/gdbreplay.c b/gdb/gdbserver/gdbreplay.c

--- a/gdb/gdbserver/gdbreplay.c

+++ b/gdb/gdbserver/gdbreplay.c

@@ -46,8 +46,11 @@

 #if USE_WIN32API

 #include <winsock2.h>

+#include <wspiapi.h>

 #endif

+#include "netstuff.h"

+

 #ifndef HAVE_SOCKLEN_T

 typedef int socklen_t;

 #endif

@@ -142,56 +145,108 @@ remote_close (void)

 static void

 remote_open (char *name)

 {

-  if (!strchr (name, ':'))

+  char *last_colon = strrchr (name, ':');

+

+  if (last_colon == NULL)

     {

       fprintf (stderr, "%s: Must specify tcp connection as host:addr\n", name);

       fflush (stderr);

       exit (1);

     }

-  else

-    {

+

 #ifdef USE_WIN32API

-      static int winsock_initialized;

+  static int winsock_initialized;

 #endif

-      char *port_str;

-      int port;

-      struct sockaddr_in sockaddr;

-      socklen_t tmp;

-      int tmp_desc;

+  char *port_str;

+  int tmp;

+  int tmp_desc;

+  struct addrinfo hint;

+  struct addrinfo *ainfo;

-      port_str = strchr (name, ':');

+  memset (&hint, 0, sizeof (hint));

+  /* Assume no prefix will be passed, therefore we should use

+     AF_UNSPEC.  */

+  hint.ai_family = AF_UNSPEC;

+  hint.ai_socktype = SOCK_STREAM;

+  hint.ai_protocol = IPPROTO_TCP;

-      port = atoi (port_str + 1);

+  parsed_connection_spec parsed = parse_connection_spec (name, &hint);

+

+  if (parsed.port_str.empty ())

+    error (_("Missing port on hostname '%s'"), name);

 #ifdef USE_WIN32API

-      if (!winsock_initialized)

-	{

-	  WSADATA wsad;

+  if (!winsock_initialized)

+    {

+      WSADATA wsad;

-	  WSAStartup (MAKEWORD (1, 0), &wsad);

-	  winsock_initialized = 1;

-	}

+      WSAStartup (MAKEWORD (1, 0), &wsad);

+      winsock_initialized = 1;

+    }

 #endif

-      tmp_desc = socket (PF_INET, SOCK_STREAM, 0);

-      if (tmp_desc == -1)

-	perror_with_name ("Can't open socket");

+  int r = getaddrinfo (parsed.host_str.c_str (), parsed.port_str.c_str (),

+		       &hint, &ainfo);

-      /* Allow rapid reuse of this port. */

-      tmp = 1;

-      setsockopt (tmp_desc, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp,

-		  sizeof (tmp));

+  if (r != 0)

+    {

+      fprintf (stderr, "%s:%s: cannot resolve name: %s\n",

+	       parsed.host_str.c_str (), parsed.port_str.c_str (),