Date: Sat, 3 May 2014 07:40:00 GMT From: Dreamcat4 <dreamcat4@gmail.com> To: freebsd-doc@FreeBSD.org Subject: Re: docs/189268: 3 getaddrinfo(3) - hostanme="localhost", but it returns IN_ADDR_ANY (0.0.0.0) Message-ID: <201405030740.s437e0Bs011842@freefall.freebsd.org>
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The following reply was made to PR docs/189268; it has been noted by GNATS. From: Dreamcat4 <dreamcat4@gmail.com> To: bug-followup@freebsd.org, dreamcat4@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 &&= ; ./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--
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