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Merge pull request #2224 from serokell/getaddrinfo-preload

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Fix #2162: use getaddrinfo instead of curl to preload NSS
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Daniel Peebles 2018-06-12 09:15:17 -04:00 committed by GitHub
commit 169e1478d8
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1 changed files with 8 additions and 4 deletions
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12
src/libstore/build.cc
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@ -29,7 +29,9 @@
#include <sys/utsname.h> #include <sys/utsname.h>
#include <sys/select.h> #include <sys/select.h>
#include <sys/resource.h> #include <sys/resource.h>
#include <sys/socket.h>
#include <fcntl.h> #include <fcntl.h>
#include <netdb.h>
#include <unistd.h> #include <unistd.h>
#include <errno.h> #include <errno.h>
#include <cstring> #include <cstring>
@ -1777,12 +1779,14 @@ static std::once_flag dns_resolve_flag;
static void preloadNSS() { static void preloadNSS() {
/* builtin:fetchurl can trigger a DNS lookup, which with glibc can trigger a dynamic library load of /* builtin:fetchurl can trigger a DNS lookup, which with glibc can trigger a dynamic library load of
one of the glibc NSS libraries in a sandboxed child, which will fail unless the library's already one of the glibc NSS libraries in a sandboxed child, which will fail unless the library's already
been loaded in the parent. So we force a download of an invalid URL to force the NSS machinery to been loaded in the parent. So we force a lookup of an invalid domain to force the NSS machinery to
load its lookup libraries in the parent before any child gets a chance to. */ load its lookup libraries in the parent before any child gets a chance to. */
std::call_once(dns_resolve_flag, []() { std::call_once(dns_resolve_flag, []() {
DownloadRequest request("http://this.pre-initializes.the.dns.resolvers.invalid"); struct addrinfo *res = NULL;
request.tries = 1; // We only need to do it once, and this also suppresses an annoying warning
try { getDownloader()->download(request); } catch (...) {} if (getaddrinfo("this.pre-initializes.the.dns.resolvers.invalid.", "http", NULL, &res) != 0) {
if (res) freeaddrinfo(res);
}
}); });
} }