14415 2012-07-28 09:38:00 +0000 AI_V4MAPPED is useless with AI_UNSPEC but they're used together as defaults when hints=NULL 2013-02-24 22:12:10 +0000 1 1 1 Unclassified glibc network 2.15 All All WAITING P2 minor --- 1 psimerda psimerda carlos tore 56620 psimerda 2012-07-28 09:38:50 +0000 From 'man getaddrinfo': Specifying hints as NULL is equivalent to setting ai_socktype and ai_protocol to 0; ai_family to AF_UNSPEC; and ai_flags to (AI_V4MAPPED | AI_ADDRCONFIG). ... If hint.ai_flags specifies the AI_V4MAPPED flag, and hints.ai_family was specified as AF_INET6, and no matching IPv6 addresses could be found, then return IPv4-mapped IPv6 addresses in the list pointed to by res. If both AI_V4MAPPED and AI_ALL are specified in hints.ai_flags, then return both IPv6 and IPv4-mapped IPv6 addresses in the list pointed to by res. AI_ALL is ignored if AI_V4MAPPED is not also specified. As I read it, AI_V4MAPPED is useless without AF_INET6. So either it is wrong, or I miss something about AI_V4MAPPED that should be documented in the manpage. 56723 carlos_odonell 2012-08-03 04:03:51 +0000 My understanding is that because the default uses AF_UNSPEC that the caller accepts *any* address family thus AI_V4MAPPED is not useless because AF_UNSPEC can be treated as anything including AF_INET6. Does that clarify why we would set AI_V4MAPPED in the default? 56724 carlos_odonell 2012-08-03 04:06:03 +0000 Please note that the man pages are maintained by man-pages project here: http://www.kernel.org/doc/man-pages/ Would a clarification on the man page about the uses of AF_UNSPEC help? 56728 psimerda 2012-08-03 16:12:06 +0000 > My understanding is that because the default uses AF_UNSPEC that the caller > accepts *any* address family thus AI_V4MAPPED is not useless because AF_UNSPEC > can be treated as anything including AF_INET6. This is not the case. My tests say that AF_UNSPEC with AI_V4MAPPED returns regular IPv4 addresses, regular IPv6 addresses but *no* IPv4-mapped IPv6 addresses. So it actually behaves exactly like AF_UNSPEC without AI_V4MAPPED. > Does that clarify why we would set AI_V4MAPPED in the default? Unfortunately not. 57549 6649 psimerda 2012-09-22 15:45:24 +0000 Created attachment 6649 patch to remove useless AI_V4MAPPED from default with AF_UNSPEC 59306 6794 psimerda 2013-01-03 14:53:57 +0000 Created attachment 6794 getaddrinfo: use zero ai_flags by default According to POSIX1-2008, AI_V4MAPPED flag shall be ignored unless ai_family equals AF_INET6. In the default hints, ai_family is AF_UNSPEC. Therefore AI_V4MAPPED is redundant. AI_ADDRCONFIG can potentially be beneficial to applications that use getaddrinfo() results to immediately call connect(), sendto() and similar functions to avoid querying redundant DNS records according to the current address configuration. Those applications will also need to specify ai_socktype and/or ai_protocol and therefore will not use hints=NULL. As AI_DEFAULT is not a part of the public API, such applications will not be able to use the default flags at all. Please note that POSIX1-2008 doesn't define any default flags at all. Resolves: #14415, #14965 6649 2012-09-22 15:45:00 +0000 2012-09-22 15:45:24 +0000 patch to remove useless AI_V4MAPPED from default with AF_UNSPEC glibc-remove-default-v4mapped.patch text/plain 763 psimerda Y29tbWl0IDhjMzhiMTg5MTlhODcyN2Q1NDQzODM5NTEyOWZkNmZlMjIwOWEzYTcKQXV0aG9yOiBQ YXZlbCDFoGltZXJkYSA8cHNpbWVyZGFAcmVkaGF0LmNvbT4KRGF0ZTogICBTYXQgU2VwIDIyIDE0 OjMyOjMzIDIwMTIgKzAyMDAKCiAgICByZW1vdmUgQUlfVjRNQVBQRUQgZnJvbSBkZWZhdWx0IGdl dGFkZHJpbmZvKCkgaGludHMKICAgIAogICAgQWNjb3JkaW5nIHRvIHRoZSBtYW51YWwgcGFnZSwg QUlfVjRNQVBQRUQgb25seSBtYWtlcyBzZW5zZSB3aXRoIEFGX0lORVQ2IGFuZAogICAgdGhlIGRl ZmF1bHQgZmFtaWx5IGlzIEFGX1VOU1BFQy4gVGhlcmVmb3JlIGl0J3MgdXNlbGVzcyBhbmQgY29u ZnVzaW5nLgoKZGlmZiAtLWdpdCBhL2luY2x1ZGUvbmV0ZGIuaCBiL2luY2x1ZGUvbmV0ZGIuaApp bmRleCAzZjJhZTA2Li4yYjU2MmIyIDEwMDY0NAotLS0gYS9pbmNsdWRlL25ldGRiLmgKKysrIGIv aW5jbHVkZS9uZXRkYi5oCkBAIC0xOTAsNyArMTkwLDcgQEAgbGliY19oaWRkZW5fcHJvdG8gKHJ1 c2VycGFzcykKIC8qIFRoZSBmb2xsb3dpbmcgZGVmaW5pdGlvbiBoYXMgYmVlbiByZW1vdmVkIGZy b20gdGhlIHB1YmxpYyBoZWFkZXIKICAgIHNpbmNlIHdlIGRvbid0IHdhbnQgcGVvcGxlIHRvIHVz ZSB0aGVtLiAgKi8KIAotI2RlZmluZSBBSV9ERUZBVUxUICAgIChBSV9WNE1BUFBFRCB8IEFJX0FE RFJDT05GSUcpCisjZGVmaW5lIEFJX0RFRkFVTFQgICAgQUlfQUREUkNPTkZJRwogCiAjaW5jbHVk ZSA8aW5ldC9uZXRncm91cC5oPgogCg== 6794 2013-01-03 14:53:00 +0000 2013-01-03 14:53:57 +0000 getaddrinfo: use zero ai_flags by default getaddrinfo-zero-ai-flags.patch text/plain 1837 psimerda Y29tbWl0IGRjZjQ3ZGFmMmI4YTRhZGViNDMzNDI5YjE3YjJlM2U3ZTQ0OWRmZWEKQXV0aG9yOiBQ YXZlbCDFoGltZXJkYSA8cGF2bGl4QHBhdmxpeC5uZXQ+CkRhdGU6ICAgVGh1IERlYyAyMCAyMToz Mjo0MyAyMDEyICswMTAwCgogICAgZ2V0YWRkcmluZm86IHVzZSB6ZXJvIGFpX2ZsYWdzIGJ5IGRl ZmF1bHQKICAgIAogICAgQWNjb3JkaW5nIHRvIFBPU0lYMS0yMDA4LCBBSV9WNE1BUFBFRCBmbGFn IHNoYWxsIGJlIGlnbm9yZWQgdW5sZXNzIGFpX2ZhbWlseQogICAgZXF1YWxzIEFGX0lORVQ2LiBJ biB0aGUgZGVmYXVsdCBoaW50cywgYWlfZmFtaWx5IGlzIEFGX1VOU1BFQy4gVGhlcmVmb3JlCiAg ICBBSV9WNE1BUFBFRCBpcyByZWR1bmRhbnQuCiAgICAKICAgIEFJX0FERFJDT05GSUcgY2FuIHBv dGVudGlhbGx5IGJlIGJlbmVmaWNpYWwgdG8gYXBwbGljYXRpb25zIHRoYXQgdXNlCiAgICBnZXRh ZGRyaW5mbygpIHJlc3VsdHMgdG8gaW1tZWRpYXRlbHkgY2FsbCBjb25uZWN0KCksIHNlbmR0bygp IGFuZAogICAgc2ltaWxhciBmdW5jdGlvbnMgdG8gYXZvaWQgcXVlcnlpbmcgcmVkdW5kYW50IERO UyByZWNvcmRzIGFjY29yZGluZwogICAgdG8gdGhlIGN1cnJlbnQgYWRkcmVzcyBjb25maWd1cmF0 aW9uLgogICAgCiAgICBUaG9zZSBhcHBsaWNhdGlvbnMgd2lsbCBhbHNvIG5lZWQgdG8gc3BlY2lm eSBhaV9zb2NrdHlwZSBhbmQvb3IKICAgIGFpX3Byb3RvY29sIGFuZCB0aGVyZWZvcmUgd2lsbCBu b3QgdXNlIGhpbnRzPU5VTEwuIEFzIEFJX0RFRkFVTFQgaXMgbm90CiAgICBhIHBhcnQgb2YgdGhl IHB1YmxpYyBBUEksIHN1Y2ggYXBwbGljYXRpb25zIHdpbGwgbm90IGJlIGFibGUgdG8gdXNlIHRo ZQogICAgZGVmYXVsdCBmbGFncyBhdCBhbGwuCiAgICAKICAgIFBsZWFzZSBub3RlIHRoYXQgUE9T SVgxLTIwMDggZG9lc24ndCBkZWZpbmUgYW55IGRlZmF1bHQgZmxhZ3MgYXQgYWxsLgogICAgCiAg ICBSZXNvbHZlczogIzE0NDE1LCAjMTQ5NjUKCmRpZmYgLS1naXQgYS9pbmNsdWRlL25ldGRiLmgg Yi9pbmNsdWRlL25ldGRiLmgKaW5kZXggM2YyYWUwNi4uN2E2MmEwMiAxMDA2NDQKLS0tIGEvaW5j bHVkZS9uZXRkYi5oCisrKyBiL2luY2x1ZGUvbmV0ZGIuaApAQCAtMTg3LDExICsxODcsNiBAQCBl eHRlcm4gaW50IHJ1c2VycGFzcyAoY29uc3QgY2hhciAqaG9zdCwgY29uc3QgY2hhciAqKmFuYW1l LAogbGliY19oaWRkZW5fcHJvdG8gKHJ1c2VycGFzcykKIAogCi0vKiBUaGUgZm9sbG93aW5nIGRl ZmluaXRpb24gaGFzIGJlZW4gcmVtb3ZlZCBmcm9tIHRoZSBwdWJsaWMgaGVhZGVyCi0gICBzaW5j ZSB3ZSBkb24ndCB3YW50IHBlb3BsZSB0byB1c2UgdGhlbS4gICovCi0KLSNkZWZpbmUgQUlfREVG QVVMVCAgICAoQUlfVjRNQVBQRUQgfCBBSV9BRERSQ09ORklHKQotCiAjaW5jbHVkZSA8aW5ldC9u ZXRncm91cC5oPgogCiBzdHJ1Y3QgcGFyc2VyX2RhdGE7CmRpZmYgLS1naXQgYS9zeXNkZXBzL3Bv c2l4L2dldGFkZHJpbmZvLmMgYi9zeXNkZXBzL3Bvc2l4L2dldGFkZHJpbmZvLmMKaW5kZXggMzdk ZTMzNS4uZDBhMGU3NyAxMDA2NDQKLS0tIGEvc3lzZGVwcy9wb3NpeC9nZXRhZGRyaW5mby5jCisr KyBiL3N5c2RlcHMvcG9zaXgvZ2V0YWRkcmluZm8uYwpAQCAtMTMzLDcgKzEzMyw3IEBAIHN0cnVj dCBnYWloCiAKIHN0YXRpYyBjb25zdCBzdHJ1Y3QgYWRkcmluZm8gZGVmYXVsdF9oaW50cyA9CiAg IHsKLSAgICAuYWlfZmxhZ3MgPSBBSV9ERUZBVUxULAorICAgIC5haV9mbGFncyA9IDAsCiAgICAg LmFpX2ZhbWlseSA9IFBGX1VOU1BFQywKICAgICAuYWlfc29ja3R5cGUgPSAwLAogICAgIC5haV9w cm90b2NvbCA9IDAsCg==