docs/189268: 3 getaddrinfo(3) - hostanme="localhost", but it returns IN_ADDR_ANY (0.0.0.0)

[Dreamcat4]

The following reply was made to PR docs/189268; it has been noted by GNATS.

From: Dreamcat4 <dreamcat4 at gmail.com>
To: bug-followup at freebsd.org, dreamcat4 at gmail.com
Cc:  
Subject: Re: docs/189268: 3 getaddrinfo(3) - hostanme="localhost",
 but it returns IN_ADDR_ANY (0.0.0.0)
Date: Sat, 3 May 2014 08:29:44 +0100

 --089e012953d0181fd904f879df3a
 Content-Type: text/plain; charset=UTF-8
 
 Ah,
 I have researched a little more. It is my impression that the expected
 result aught to be "::1" if the protocol family was PF_UNSPEC or PF_INET6.
 
 Now that Allan has mentioned it. Commenting out the ::1 in /etc/hosts does
 change the result. However that isn't something the gSOAP library which is
 making that API call has any control over.
 
 Also:
 
 This bug occurs when the protocol family being requested is set to
 "PF_UNSPEC" (unspecified). OR "PF_INET6". With the default "/etc/hosts"
 file (where that ::1 localhost entry exists).
 
 Wheras setting:
 
 hints.ai_family   = PF_INET;
 
 returns 127.0.0.1 regardless of the ::1 in /etc/hosts file.
 
 Setting:
 
 hints.ai_family   = PF_INET6;
 
 also gives such incorrect "0.0.0.0", except if commenting out ::1 in
 /etc/hosts as Alan says.
 
 Then it gives:
 
 getaddrinfo ~/ root~# gcc test.c -o test && ./test
 getaddrinfo failed with code 8.
 
 Which would be correct to error out since no corresponding ip6 address
 found.
 
 
 The gSOAP library seems to choose PF_UNSPEC because they want to support
 both ipv4 and ipv6 protocols simultaneously (as many others also do). I'm
 not sure if they could fix downstream the issue by avoiding PF_UNSPEC
 because the bug will still occur on PF_INET6.
 
 
 Anyway. Heres is the gSOAP code where getaddrinfo() is being called in
 "soap_bind()":
 
 http://sourceforge.net/p/gsoap2/code/HEAD/tree/gsoap/stdsoap2.cpp#l4789
 
 http://sourceforge.net/p/gsoap2/code/HEAD/tree/gsoap/stdsoap2.cpp#l4791
 
 Then later on in soap_bind() the incorrect address (0.0.0.0), is used are
 the parameter being passed into bind()
 
 http://sourceforge.net/p/gsoap2/code/HEAD/tree/gsoap/stdsoap2.cpp#l4876
 
 --089e012953d0181fd904f879df3a
 Content-Type: text/html; charset=UTF-8
 Content-Transfer-Encoding: quoted-printable
 
 <div dir=3D"ltr"><div><div>Ah,</div><div>I have researched a little more. I=
 t is my impression that the expected result aught to be "::1" if =
 the protocol family was PF_UNSPEC or PF_INET6.<br></div></div><div><br></di=
 v>
 
 Now that Allan has mentioned it. Commenting out the ::1 in /etc/hosts does =
 change the result. However that isn't something the gSOAP library which=
  is making that API call has any control over.<div><br></div><div>Also:</di=
 v>
 
 <div><br></div><div>This bug occurs when the protocol family being requeste=
 d is set to "PF_UNSPEC" (unspecified). OR "PF_INET6". W=
 ith the default "/etc/hosts" file (where that ::1 localhost entry=
  exists).</div>
 
 <div><br></div><div>Wheras setting:</div><div><br></div><div>hints.ai_famil=
 y =C2=A0 =3D PF_INET;</div><div><br></div><div>returns 127.0.0.1 regardless=
  of the ::1 in /etc/hosts file.</div><div><br></div><div>Setting:<br></div>=
 <div>
 
 <br></div><div><div>hints.ai_family =C2=A0 =3D PF_INET6;</div></div><div><b=
 r></div><div>also gives such incorrect "0.0.0.0", except if comme=
 nting out ::1 in /etc/hosts as Alan says.</div><div><br></div><div>Then it =
 gives:</div>
 
 <div><br></div><div><div>getaddrinfo ~/ root~# gcc test.c -o test &&amp=
 ; ./test</div><div>getaddrinfo failed with code 8.</div></div><div><br></di=
 v><div>Which would be correct to error out since no corresponding ip6 addre=
 ss found.</div>
 
 <div><br></div><div><br></div><div>The gSOAP library seems to choose PF_UNS=
 PEC because they want to support both ipv4 and ipv6 protocols simultaneousl=
 y (as many others also do). I'm not sure if they could fix downstream t=
 he issue by avoiding PF_UNSPEC because the bug will still occur on PF_INET6=
 .<br>
 
 </div><div><br></div><div><br></div><div>Anyway. Heres is the gSOAP code wh=
 ere getaddrinfo() is being called in "soap_bind()":</div><div><br=
 ></div><div><a href=3D"http://sourceforge.net/p/gsoap2/code/HEAD/tree/gsoap=
 /stdsoap2.cpp#l4789">http://sourceforge.net/p/gsoap2/code/HEAD/tree/gsoap/s=
 tdsoap2.cpp#l4789</a><br>
 
 </div><div><br></div><div><a href=3D"http://sourceforge.net/p/gsoap2/code/H=
 EAD/tree/gsoap/stdsoap2.cpp#l4791">http://sourceforge.net/p/gsoap2/code/HEA=
 D/tree/gsoap/stdsoap2.cpp#l4791</a><br></div><div><br></div><div>Then later=
  on in soap_bind() the incorrect address (0.0.0.0), is used are the paramet=
 er being passed into bind()</div>
 
 <div><br></div><div><div><a href=3D"http://sourceforge.net/p/gsoap2/code/HE=
 AD/tree/gsoap/stdsoap2.cpp#l4876">http://sourceforge.net/p/gsoap2/code/HEAD=
 /tree/gsoap/stdsoap2.cpp#l4876</a><br></div></div><div><br></div><div><br>
 
 </div></div>
 
 --089e012953d0181fd904f879df3a--