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curl: enable threaded resolver

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Multi-threaded applications using libcurl crash
on DNS timeouts when built using OE.

The reason is as follows:
By default, libcurl implements DNS timeouts using a
timer (alarm()) and a pair of setjmp()/longjmp().
This approach is unsafe in multi-threaded applications
for various reasons, as e.g. explained in the relevant
man-pages.

To avoid this, libcurl can be compiled with a built-in
threaded resolver, or against the c-ares asynchronous
resolver library.

To keep extra dependencies to a minimum, and to mimic
other distributions (debian at least), and because
c-ares is not available in OE-core, add a PACKAGECONFIG
to be able to enable use of of the built-in threaded
resolver and enable it by default.

(From OE-Core rev: 41f1e44fce976c4140cda62a41349e91e69d04ef)

Signed-off-by: André Draszik <adraszik@tycoint.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
André Draszik
2017-09-04 10:42:44 +01:00
committed by Richard Purdie
parent c697226168
commit 21d81abfa1
1 changed files with 4 additions and 3 deletions
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meta/recipes-support/curl/curl_7.54.1.bb
+4 -3
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@@ -20,9 +20,9 @@ SRC_URI[sha256sum] = "fdfc4df2d001ee0c44ec071186e770046249263c491fcae48df0e1a3ca
CVE_PRODUCT = "libcurl"
inherit autotools pkgconfig binconfig multilib_header
PACKAGECONFIG ??= "${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} gnutls proxy zlib"
PACKAGECONFIG_class-native = "ipv6 proxy ssl zlib"
PACKAGECONFIG_class-nativesdk = "ipv6 proxy ssl zlib"
PACKAGECONFIG ??= "${@bb.utils.filter('DISTRO_FEATURES', 'ipv6', d)} gnutls proxy threaded-resolver zlib"
PACKAGECONFIG_class-native = "ipv6 proxy ssl threaded-resolver zlib"
PACKAGECONFIG_class-nativesdk = "ipv6 proxy ssl threaded-resolver zlib"
PACKAGECONFIG[dict] = "--enable-dict,--disable-dict,"
PACKAGECONFIG[gnutls] = "--with-gnutls,--without-gnutls,gnutls"
@@ -42,6 +42,7 @@ PACKAGECONFIG[smtp] = "--enable-smtp,--disable-smtp,"
PACKAGECONFIG[ssl] = "--with-ssl --with-random=/dev/urandom,--without-ssl,openssl"
PACKAGECONFIG[telnet] = "--enable-telnet,--disable-telnet,"
PACKAGECONFIG[tftp] = "--enable-tftp,--disable-tftp,"
PACKAGECONFIG[threaded-resolver] = "--enable-threaded-resolver,--disable-threaded-resolver"
PACKAGECONFIG[zlib] = "--with-zlib=${STAGING_LIBDIR}/../,--without-zlib,zlib"
PACKAGECONFIG[krb5] = "--with-gssapi,--without-gssapi,krb5"