2017-10-11 05:07:51 +00:00
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/* Parse /etc/hosts in multi mode with many addresses/aliases.
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2022-01-01 18:54:23 +00:00
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Copyright (C) 2017-2022 Free Software Foundation, Inc.
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2017-10-11 05:07:51 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2017-10-11 05:07:51 +00:00
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#include <dlfcn.h>
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#include <errno.h>
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#include <gnu/lib-names.h>
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#include <netdb.h>
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#include <nss.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/check_nss.h>
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#include <support/namespace.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/test-driver.h>
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#include <support/xmemstream.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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#include <sys/resource.h>
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struct support_chroot *chroot_env;
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static void
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prepare (int argc, char **argv)
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{
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chroot_env = support_chroot_create
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((struct support_chroot_configuration)
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{
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.resolv_conf = "",
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.hosts = "", /* See write_hosts below. */
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.host_conf = "multi on\n",
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});
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}
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/* Create the /etc/hosts file from outside the chroot. */
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static void
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write_hosts (int count)
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{
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TEST_VERIFY (count > 0 && count <= 65535);
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FILE *fp = xfopen (chroot_env->path_hosts, "w");
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fputs ("127.0.0.1 localhost localhost.localdomain\n"
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"::1 localhost localhost.localdomain\n",
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fp);
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for (int i = 0; i < count; ++i)
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{
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fprintf (fp, "10.4.%d.%d www4.example.com\n",
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(i / 256) & 0xff, i & 0xff);
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fprintf (fp, "10.46.%d.%d www.example.com\n",
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(i / 256) & 0xff, i & 0xff);
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fprintf (fp, "192.0.2.1 alias.example.com v4-%d.example.com\n", i);
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fprintf (fp, "2001:db8::6:%x www6.example.com\n", i);
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fprintf (fp, "2001:db8::46:%x www.example.com\n", i);
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fprintf (fp, "2001:db8::1 alias.example.com v6-%d.example.com\n", i);
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}
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xfclose (fp);
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}
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/* Parameters of a single test. */
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struct test_params
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{
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const char *name; /* Name to query. */
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const char *marker; /* Address marker for the name. */
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int count; /* Number of addresses/aliases. */
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int family; /* AF_INET, AF_INET_6 or AF_UNSPEC. */
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bool canonname; /* True if AI_CANONNAME should be enabled. */
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};
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/* Expected result of gethostbyname/gethostbyname2. */
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static char *
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expected_ghbn (const struct test_params *params)
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{
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TEST_VERIFY (params->family == AF_INET || params->family == AF_INET6);
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struct xmemstream expected;
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xopen_memstream (&expected);
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if (strcmp (params->name, "alias.example.com") == 0)
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{
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fprintf (expected.out, "name: %s\n", params->name);
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char af;
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if (params->family == AF_INET)
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af = '4';
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else
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af = '6';
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for (int i = 0; i < params->count; ++i)
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fprintf (expected.out, "alias: v%c-%d.example.com\n", af, i);
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for (int i = 0; i < params->count; ++i)
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if (params->family == AF_INET)
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fputs ("address: 192.0.2.1\n", expected.out);
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else
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fputs ("address: 2001:db8::1\n", expected.out);
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}
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else /* www/www4/www6 name. */
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{
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bool do_ipv4 = params->family == AF_INET
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&& strncmp (params->name, "www6", 4) != 0;
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bool do_ipv6 = params->family == AF_INET6
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&& strncmp (params->name, "www4", 4) != 0;
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if (do_ipv4 || do_ipv6)
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{
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fprintf (expected.out, "name: %s\n", params->name);
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if (do_ipv4)
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for (int i = 0; i < params->count; ++i)
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fprintf (expected.out, "address: 10.%s.%d.%d\n",
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params->marker, i / 256, i % 256);
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if (do_ipv6)
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for (int i = 0; i < params->count; ++i)
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fprintf (expected.out, "address: 2001:db8::%s:%x\n",
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params->marker, i);
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}
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else
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fputs ("error: HOST_NOT_FOUND\n", expected.out);
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}
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xfclose_memstream (&expected);
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return expected.buffer;
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}
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/* Expected result of getaddrinfo. */
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static char *
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expected_gai (const struct test_params *params)
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{
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bool do_ipv4 = false;
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bool do_ipv6 = false;
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if (params->family == AF_UNSPEC)
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do_ipv4 = do_ipv6 = true;
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else if (params->family == AF_INET)
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do_ipv4 = true;
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else if (params->family == AF_INET6)
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do_ipv6 = true;
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struct xmemstream expected;
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xopen_memstream (&expected);
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if (strcmp (params->name, "alias.example.com") == 0)
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{
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if (params->canonname)
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fprintf (expected.out,
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"flags: AI_CANONNAME\n"
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"canonname: %s\n",
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params->name);
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if (do_ipv4)
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for (int i = 0; i < params->count; ++i)
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fputs ("address: STREAM/TCP 192.0.2.1 80\n", expected.out);
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if (do_ipv6)
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for (int i = 0; i < params->count; ++i)
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fputs ("address: STREAM/TCP 2001:db8::1 80\n", expected.out);
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}
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else /* www/www4/www6 name. */
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{
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if (strncmp (params->name, "www4", 4) == 0)
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do_ipv6 = false;
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else if (strncmp (params->name, "www6", 4) == 0)
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do_ipv4 = false;
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/* Otherwise, we have www as the name, so we do both. */
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if (do_ipv4 || do_ipv6)
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{
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if (params->canonname)
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fprintf (expected.out,
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"flags: AI_CANONNAME\n"
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"canonname: %s\n",
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params->name);
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if (do_ipv4)
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for (int i = 0; i < params->count; ++i)
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fprintf (expected.out, "address: STREAM/TCP 10.%s.%d.%d 80\n",
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params->marker, i / 256, i % 256);
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if (do_ipv6)
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for (int i = 0; i < params->count; ++i)
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fprintf (expected.out,
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"address: STREAM/TCP 2001:db8::%s:%x 80\n",
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params->marker, i);
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}
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else
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fputs ("error: Name or service not known\n", expected.out);
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}
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xfclose_memstream (&expected);
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return expected.buffer;
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}
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static void
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run_gbhn_gai (struct test_params *params)
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{
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char *ctx = xasprintf ("name=%s marker=%s count=%d family=%d",
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params->name, params->marker, params->count,
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params->family);
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if (test_verbose > 0)
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printf ("info: %s\n", ctx);
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/* Check gethostbyname, gethostbyname2. */
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if (params->family == AF_INET)
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{
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char *expected = expected_ghbn (params);
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check_hostent (ctx, gethostbyname (params->name), expected);
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free (expected);
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}
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if (params->family != AF_UNSPEC)
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{
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char *expected = expected_ghbn (params);
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check_hostent (ctx, gethostbyname2 (params->name, params->family),
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expected);
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free (expected);
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}
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/* Check getaddrinfo. */
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for (int do_canonical = 0; do_canonical < 2; ++do_canonical)
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{
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params->canonname = do_canonical;
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char *expected = expected_gai (params);
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struct addrinfo hints =
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{
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.ai_family = params->family,
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.ai_socktype = SOCK_STREAM,
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.ai_protocol = IPPROTO_TCP,
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};
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if (do_canonical)
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hints.ai_flags |= AI_CANONNAME;
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struct addrinfo *ai;
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int ret = getaddrinfo (params->name, "80", &hints, &ai);
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check_addrinfo (ctx, ai, ret, expected);
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if (ret == 0)
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freeaddrinfo (ai);
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free (expected);
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}
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free (ctx);
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}
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/* Callback for the subprocess which runs the test in a chroot. */
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static void
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subprocess (void *closure)
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{
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struct test_params *params = closure;
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xchroot (chroot_env->path_chroot);
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static const int families[] = { AF_INET, AF_INET6, AF_UNSPEC, -1 };
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static const char *const names[] =
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{
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"www.example.com", "www4.example.com", "www6.example.com",
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"alias.example.com",
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NULL
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};
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static const char *const names_marker[] = { "46", "4", "6", "" };
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for (int family_idx = 0; families[family_idx] >= 0; ++family_idx)
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{
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params->family = families[family_idx];
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for (int names_idx = 0; names[names_idx] != NULL; ++names_idx)
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{
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params->name = names[names_idx];
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params->marker = names_marker[names_idx];
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run_gbhn_gai (params);
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}
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}
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}
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/* Run the test for a specific number of addresses/aliases. */
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static void
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run_test (int count)
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{
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write_hosts (count);
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struct test_params params =
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{
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.count = count,
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};
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support_isolate_in_subprocess (subprocess, ¶ms);
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}
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static int
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do_test (void)
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{
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support_become_root ();
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if (!support_can_chroot ())
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return EXIT_UNSUPPORTED;
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/* This test should not use gigabytes of memory. */
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{
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struct rlimit limit;
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if (getrlimit (RLIMIT_AS, &limit) != 0)
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{
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printf ("getrlimit (RLIMIT_AS) failed: %m\n");
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return 1;
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}
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long target = 200 * 1024 * 1024;
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if (limit.rlim_cur == RLIM_INFINITY || limit.rlim_cur > target)
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{
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limit.rlim_cur = target;
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if (setrlimit (RLIMIT_AS, &limit) != 0)
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{
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printf ("setrlimit (RLIMIT_AS) failed: %m\n");
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return 1;
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}
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}
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}
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__nss_configure_lookup ("hosts", "files");
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if (dlopen (LIBNSS_FILES_SO, RTLD_LAZY) == NULL)
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FAIL_EXIT1 ("could not load " LIBNSS_DNS_SO ": %s", dlerror ());
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/* Run the tests with a few different address/alias counts. */
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for (int count = 1; count <= 111; ++count)
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run_test (count);
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run_test (1111);
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run_test (22222);
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support_chroot_free (chroot_env);
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return 0;
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|
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}
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|
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2018-10-09 14:00:39 +00:00
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#define TIMEOUT 40
|
2017-10-11 05:07:51 +00:00
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|
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#define PREPARE prepare
|
|
|
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#include <support/test-driver.c>
|