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[PATCH] DNS: don't count search-path miss as a retry
by Tim Hockin 13 Mar '16

13 Mar '16

Currently a miss on a search-path entry is counted as a retry. This means that users with more than (num_nameservers * retries) entries in their search path list fail before trying all search paths. Concretely, a single nameserver with 4 search paths will never try the 4th search because the default retry is 3. The code doesn't currently retry a given nameserver in case of an error, so retries is sort of meaningless (though there are some comments indicating it might come). This change only treats total failure of a nameserver (try next server) as a retry. Signed-off-by: Tim Hockin <thockin(a)google.com> --- libc/inet/resolv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c index 4b33896..e676f53 100644 --- a/libc/inet/resolv.c +++ b/libc/inet/resolv.c @@ -1320,7 +1320,6 @@ int __dns_lookup(const char *name, local_ns_num = last_ns_num; retries_left = __nameservers * __resolv_attempts; } - retries_left--; if (local_ns_num >= __nameservers) local_ns_num = 0; local_id++; @@ -1572,6 +1571,7 @@ int __dns_lookup(const char *name, try_next_server: /* Try next nameserver */ + retries_left--; local_ns_num++; variant = -1; } while (retries_left > 0); -- 2.7.0.rc3.207.g0ac5344

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[PATCH] DNS: Don't apply search domains to PTR lookups
by Tim Hockin 13 Mar '16

13 Mar '16

This lessens the load on upstream DNS servers (and it was just nonsensical). Signed-off-by: Tim Hockin <thockin(a)google.com> --- libc/inet/resolv.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c index 4b33896..27190f0 100644 --- a/libc/inet/resolv.c +++ b/libc/inet/resolv.c @@ -1264,7 +1264,7 @@ int __dns_lookup(const char *name, int variant = -1; /* search domain to append, -1: none */ int local_ns_num = -1; /* Nth server to use */ int local_id = local_id; /* for compiler */ - int sdomains; + int sdomains = 0; bool ends_with_dot; sockaddr46_t sa; @@ -1302,7 +1302,9 @@ int __dns_lookup(const char *name, * or do other Really Bad Things. */ __UCLIBC_MUTEX_LOCK(__resolv_lock); __open_nameservers(); - sdomains = __searchdomains; + if (type != T_PTR) { + sdomains = __searchdomains; + } lookup[name_len] = '\0'; if ((unsigned)variant < sdomains) { /* lookup is name_len + 1 + MAXLEN_searchdomain + 1 long */ -- 2.7.0.rc3.207.g0ac5344

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[PATCH] getaddrinfo: correct AI_V4MAPPED handling
by Peter Korsgaard 13 Mar '16

13 Mar '16

As recently reported on the Buildroot list: http://lists.busybox.net/pipermail/buildroot/2016-March/155325.html DNS lookups with Node.js currently fails on uClibc-ng. The reason for this is the way AI_V4MAPPED is handled. According to POSIX, AI_V4MAPPED should be ignored unless ai_family is AF_INET6: http://pubs.opengroup.org/onlinepubs/9699919799/functions/freeaddrinfo.html If the AI_V4MAPPED flag is specified along with an ai_family of AF_INET6, then getaddrinfo() shall return IPv4-mapped IPv6 addresses on finding no matching IPv6 addresses (ai_addrlen shall be 16). The AI_V4MAPPED flag shall be ignored unless ai_family equals AF_INET6. uClibc-ng was also handling AI_V4MAPPED for AF_UNSPEC, fix that. Signed-off-by: Peter Korsgaard <peter(a)korsgaard.com> --- libc/inet/getaddrinfo.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/libc/inet/getaddrinfo.c b/libc/inet/getaddrinfo.c index 090d7e9..7ae32be 100644 --- a/libc/inet/getaddrinfo.c +++ b/libc/inet/getaddrinfo.c @@ -404,8 +404,7 @@ gaih_inet(const char *name, const struct gaih_service *service, struct gaih_servtuple *st; struct gaih_addrtuple *at; int rc; - int v4mapped = (req->ai_family == PF_UNSPEC || req->ai_family == PF_INET6) - && (req->ai_flags & AI_V4MAPPED); + int v4mapped = req->ai_family == PF_INET6 && (req->ai_flags & AI_V4MAPPED); unsigned seen = 0; if (req->ai_flags & AI_ADDRCONFIG) { /* "seen" is only used when AI_ADDRCONFIG is specified. -- 2.7.0

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new release 1.0.13 - Chimay Doree
by Waldemar Brodkorb 13 Mar '16

13 Mar '16

Hi, I cut down a new release today. I've made some changes to the infrastructure of the project: - Updated the project server to Debian/jessie - Added a Github mirror: https://github.com/wbx-github/uclibc-ng - All domains are available via SSL with letsencrypt certs - All domains are reachable via IPv6 - Release files and GIT tags are signed with my GnuPG key http://www.waldemar-brodkorb.de/wbx.asc Thanks you very much for all contributions and bug reports. Release includes following changes: Anton Kolesov (2): Advertise obstack only when chosen ARC: Disable obstack Max Filippov (2): xtensa: fix stack unwinding over __default_sa_restorer arm: fix __JMP_BUF_SP definition Peter Korsgaard (1): getaddrinfo: correct AI_V4MAPPED handling Thomas Claveirole (1): include/netdb.h: Do not define IDN-related flags. Tim Hockin (2): DNS: don't count search-path miss as a retry DNS: Don't apply search domains to PTR lookups Ubaldo Porcheddu (2): Replaced any occurence of /bin/sh with _PATH_BSHELL to allow easier portability on system with default shell on a different directory, like for instance on android. Replace /etc/resolv.conf with _PATH_RESCONF to allow portability of the code on system where resolv.conf is not in /etc . Waldemar Brodkorb (14): mips: fix build if threads are disabled frv: resurrect port somehow, totally untested libm: add ULPS for cris architecture refresh xtensa ulps file increase timeouts to successfully run on slower hardware/emulation, f.e. xtensa libm: remove dead code mark a.out support as not available test: update ulps file for ARM test: update ulps for SPARC mips64: with n64 ABI mapping failed arm: allow to build with DODEBUG=y ia64: disable atomic tests ia64: sync with glibc headers bump version for release

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uClibc-ng - small C library for embedded systems annotated tag v1.0.13 created. v1.0.13
by wbx＠helium.waldemar-brodkorb.de 13 Mar '16

13 Mar '16

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "uClibc-ng - small C library for embedded systems". The annotated tag, v1.0.13 has been created at 39682543be42da453ffa6dbf1106d91cdd0d438a (tag) tagging 50a5c1c36f39b3d0feffcbdf20d906508c545ffe (commit) replaces v1.0.12 tagged by Waldemar Brodkorb on Sun Mar 13 22:48:50 2016 +0100 - Log ----------------------------------------------------------------- release 1.0.13 - Chimay Doree -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIcBAABCAAGBQJW5eBCAAoJEMEz+QKmmH5i+vEP/i3uzsI9DK9EERiCpLyYBJDm 0088JpAC+cGAyKrTYHwp/PPhutfZjmrQm86mftlk9/G09ZaxMhzottjXLXjKy+Xu 3OsainxP3H7ISUE246WKyU88RV4k8y4zd/Dnn6PjpxQOD7BKKUSDddEWrN5ZP10E 2yiVcyEeiBHpHYHZZeI51FaP9IGSQTRugTNLmD/HDOhrk6Y9snsN3okwNWeHgYD3 5UC57NE6we8H2ioZsEvRmzFDLP4AYmpVqXjV2/JBH751sYdCf4BGSyxDN0asQ/Lk P01pQKNOB0hFvxjzG52lR1TYotmmkRR5vz5w0EU77qXHnjp2QRbZ0tsf0AikhHpj PTzk0o7yD73+rZHJD0rPUIc6v6Zwwif8FFRYWm0vwWJnyCaAIGlKiIZ70t4cz61O okahzGI5J4xNMIZGT6gPLO0pPsy/kh6CHYGnn6qxR6yFzrJA4IQLRDmibAxSphPr 7QAVOrjv9HnZ7esHzyBwePBHmTTBKvmcLLEANEvFW5tngfIJvjmAyHLKT2M5052K NRuVgVeTL3Mh0xI/ByvNHiT4Xgciq6ISLGVRDW4xyc4KG0FtzjlX5GSb27Q5l8RL B/3/wu2LZ5ykv/OHHskK4fLWQD04l+p9oipeEWSmPcfrhx71/IPX/wL/OrsWG5Ac lP5xYbDe5Ev+qYig+2sb =DnIi -----END PGP SIGNATURE----- Anton Kolesov (2): Advertise obstack only when chosen ARC: Disable obstack Max Filippov (2): xtensa: fix stack unwinding over __default_sa_restorer arm: fix __JMP_BUF_SP definition Peter Korsgaard (1): getaddrinfo: correct AI_V4MAPPED handling Thomas Claveirole (1): include/netdb.h: Do not define IDN-related flags. Tim Hockin (2): DNS: don't count search-path miss as a retry DNS: Don't apply search domains to PTR lookups Ubaldo Porcheddu (2): Replaced any occurence of /bin/sh with _PATH_BSHELL to allow easier portability on system with default shell on a different directory, like for instance on android. Replace /etc/resolv.conf with _PATH_RESCONF to allow portability of the code on system where resolv.conf is not in /etc . Waldemar Brodkorb (14): mips: fix build if threads are disabled frv: resurrect port somehow, totally untested libm: add ULPS for cris architecture refresh xtensa ulps file increase timeouts to successfully run on slower hardware/emulation, f.e. xtensa libm: remove dead code mark a.out support as not available test: update ulps file for ARM test: update ulps for SPARC mips64: with n64 ABI mapping failed arm: allow to build with DODEBUG=y ia64: disable atomic tests ia64: sync with glibc headers bump version for release ----------------------------------------------------------------------- hooks/post-receive -- uClibc-ng - small C library for embedded systems

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uClibc-ng - small C library for embedded systems branch master updated. v1.0.12-24-g50a5c1c
by wbx＠helium.waldemar-brodkorb.de 13 Mar '16

13 Mar '16

1 0

uClibc-ng - small C library for embedded systems branch master updated. v1.0.12-23-g3c14571
by wbx＠helium.waldemar-brodkorb.de 10 Mar '16

10 Mar '16

This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "uClibc-ng - small C library for embedded systems". The branch, master has been updated via 3c1457161e5206c2d576ab25d350a139511c096d (commit) via 8c85b44f6ab42561207365f19b9d1fd69d960771 (commit) via 2ac8348609b63d6f3a87cb27ce17deff889c6a73 (commit) from 3c67c044f93b452aa483eb1246195ebb4443cb44 (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- commit 3c1457161e5206c2d576ab25d350a139511c096d Author: Peter Korsgaard <peter(a)korsgaard.com> Date: Wed Mar 9 22:49:07 2016 +0100 getaddrinfo: correct AI_V4MAPPED handling As recently reported on the Buildroot list: http://lists.busybox.net/pipermail/buildroot/2016-March/155325.html DNS lookups with Node.js currently fails on uClibc-ng. The reason for this is the way AI_V4MAPPED is handled. According to POSIX, AI_V4MAPPED should be ignored unless ai_family is AF_INET6: http://pubs.opengroup.org/onlinepubs/9699919799/functions/freeaddrinfo.html If the AI_V4MAPPED flag is specified along with an ai_family of AF_INET6, then getaddrinfo() shall return IPv4-mapped IPv6 addresses on finding no matching IPv6 addresses (ai_addrlen shall be 16). The AI_V4MAPPED flag shall be ignored unless ai_family equals AF_INET6. uClibc-ng was also handling AI_V4MAPPED for AF_UNSPEC, fix that. Signed-off-by: Peter Korsgaard <peter(a)korsgaard.com> commit 8c85b44f6ab42561207365f19b9d1fd69d960771 Author: Tim Hockin <thockin(a)google.com> Date: Wed Mar 9 22:12:23 2016 +0100 DNS: Don't apply search domains to PTR lookups This lessens the load on upstream DNS servers (and it was just nonsensical). Signed-off-by: Tim Hockin <thockin(a)google.com> commit 2ac8348609b63d6f3a87cb27ce17deff889c6a73 Author: Tim Hockin <thockin(a)google.com> Date: Wed Mar 9 21:48:32 2016 +0100 DNS: don't count search-path miss as a retry Currently a miss on a search-path entry is counted as a retry. This means that users with more than (num_nameservers * retries) entries in their search path list fail before trying all search paths. Concretely, a single nameserver with 4 search paths will never try the 4th search because the default retry is 3. The code doesn't currently retry a given nameserver in case of an error, so retries is sort of meaningless (though there are some comments indicating it might come). This change only treats total failure of a nameserver (try next server) as a retry. Signed-off-by: Tim Hockin <thockin(a)google.com> ----------------------------------------------------------------------- Summary of changes: libc/inet/getaddrinfo.c | 3 +-- libc/inet/resolv.c | 8 +++++--- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/libc/inet/getaddrinfo.c b/libc/inet/getaddrinfo.c index 090d7e9..7ae32be 100644 --- a/libc/inet/getaddrinfo.c +++ b/libc/inet/getaddrinfo.c @@ -404,8 +404,7 @@ gaih_inet(const char *name, const struct gaih_service *service, struct gaih_servtuple *st; struct gaih_addrtuple *at; int rc; - int v4mapped = (req->ai_family == PF_UNSPEC || req->ai_family == PF_INET6) - && (req->ai_flags & AI_V4MAPPED); + int v4mapped = req->ai_family == PF_INET6 && (req->ai_flags & AI_V4MAPPED); unsigned seen = 0; if (req->ai_flags & AI_ADDRCONFIG) { /* "seen" is only used when AI_ADDRCONFIG is specified. diff --git a/libc/inet/resolv.c b/libc/inet/resolv.c index 4b33896..f378c9b 100644 --- a/libc/inet/resolv.c +++ b/libc/inet/resolv.c @@ -1264,7 +1264,7 @@ int __dns_lookup(const char *name, int variant = -1; /* search domain to append, -1: none */ int local_ns_num = -1; /* Nth server to use */ int local_id = local_id; /* for compiler */ - int sdomains; + int sdomains = 0; bool ends_with_dot; sockaddr46_t sa; @@ -1302,7 +1302,9 @@ int __dns_lookup(const char *name, * or do other Really Bad Things. */ __UCLIBC_MUTEX_LOCK(__resolv_lock); __open_nameservers(); - sdomains = __searchdomains; + if (type != T_PTR) { + sdomains = __searchdomains; + } lookup[name_len] = '\0'; if ((unsigned)variant < sdomains) { /* lookup is name_len + 1 + MAXLEN_searchdomain + 1 long */ @@ -1320,7 +1322,6 @@ int __dns_lookup(const char *name, local_ns_num = last_ns_num; retries_left = __nameservers * __resolv_attempts; } - retries_left--; if (local_ns_num >= __nameservers) local_ns_num = 0; local_id++; @@ -1572,6 +1573,7 @@ int __dns_lookup(const char *name, try_next_server: /* Try next nameserver */ + retries_left--; local_ns_num++; variant = -1; } while (retries_left > 0); hooks/post-receive -- uClibc-ng - small C library for embedded systems

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uClibc-ng - small C library for embedded systems branch master updated. v1.0.12-20-g3c67c04
by wbx＠helium.waldemar-brodkorb.de 10 Mar '16

10 Mar '16

1 0

DNS reverse lookups are subject to search path expansion
by Tim Hockin 02 Mar '16

02 Mar '16

This seems wrong to me. The simplest answer seems to be a flag to __dns_lookup() indicating whether or not to allow search paths. Is that an acceptable change, or is there something better to do?

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[PATCH] arm: fix __JMP_BUF_SP definition
by Max Filippov 02 Mar '16

02 Mar '16

__JMP_BUF_SP is the index of a stack pointer slot in the __jmp_buf. According to ARM __sigsetjmp code it does not depend on configuration parameter __UCLIBC_HAS_FPU__. Make its definition unconditional. __JMP_BUF_SP is used in the unwind_stop through the _JMPBUF_CFA_UNWINDS_ADJ macro, this change fixes cleanup routines call on thread cancellation in configurations with hard FP. Signed-off-by: Max Filippov <jcmvbkbc(a)gmail.com> --- libc/sysdeps/linux/arm/jmpbuf-offsets.h | 4 ---- 1 file changed, 4 deletions(-) diff --git a/libc/sysdeps/linux/arm/jmpbuf-offsets.h b/libc/sysdeps/linux/arm/jmpbuf-offsets.h index f0e587f..93b50af 100644 --- a/libc/sysdeps/linux/arm/jmpbuf-offsets.h +++ b/libc/sysdeps/linux/arm/jmpbuf-offsets.h @@ -16,8 +16,4 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#ifdef __UCLIBC_HAS_FPU__ -#define __JMP_BUF_SP 20 -#else #define __JMP_BUF_SP 8 -#endif -- 2.1.4

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