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meson: make DNS-over-TLS support optional

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This adds dns-over-tls option to meson. If set to 'false',
systemd-resolved is not linked with libgnutls.
This commit is contained in:
Yu Watanabe 2018-06-21 01:29:49 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 4e6acc912d
commit 56ddbf1009
10 changed files with 44 additions and 29 deletions
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22
meson.build
View File

@ -1135,12 +1135,23 @@ conf.set('DEFAULT_DNSSEC_MODE',
'DNSSEC_' + default_dnssec.underscorify().to_upper())
substs.set('DEFAULT_DNSSEC_MODE', default_dnssec)
dns_over_tls = get_option('dns-over-tls')
if dns_over_tls != 'false'
have = conf.get('HAVE_GNUTLS') == 1
if dns_over_tls == 'true' and not have
error('DNS-over-TLS support was requested, but dependencies are not available')
endif
else
have = false
endif
conf.set10('ENABLE_DNS_OVER_TLS', have)
default_dns_over_tls = get_option('default-dns-over-tls')
if fuzzer_build
default_dns_over_tls = 'no'
endif
if default_dns_over_tls != 'no' and conf.get('HAVE_GNUTLS') == 0
message('default-dns-over-tls cannot be set to strict or opportunistic when gnutls is disabled. Setting default-dns-over-tls to no.')
if default_dns_over_tls != 'no' and conf.get('ENABLE_DNS_OVER_TLS') == 0
message('default-dns-over-tls cannot be set to opportunistic when DNS-over-TLS support is disabled. Setting default-dns-over-tls to no.')
default_dns_over_tls = 'no'
endif
conf.set('DEFAULT_DNS_OVER_TLS_MODE',
@ -1594,11 +1605,7 @@ if conf.get('ENABLE_RESOLVE') == 1
link_with : [libshared,
libbasic_gcrypt,
libsystemd_resolve_core],
dependencies : [threads,
libgnutls,
libgpg_error,
libm,
libidn],
dependencies : systemd_resolved_dependencies,
install_rpath : rootlibexecdir,
install : true,
install_dir : rootlibexecdir)
@ -2950,6 +2957,7 @@ foreach tuple : [
['localed'],
['networkd'],
['resolve'],
['DNS-over-TLS'],
['coredump'],
['polkit'],
['legacy pkla', install_polkit_pkla],

2
meson_options.txt
View File

@ -195,6 +195,8 @@ option('default-dns-over-tls', type : 'combo',
description : 'default DNS-over-TLS mode',
choices : ['opportunistic', 'no'],
value : 'no')
option('dns-over-tls', type : 'combo', choices : ['auto', 'true', 'false'],
description : 'DNS-over-TLS support')
option('dns-servers', type : 'string',
description : 'space-separated list of default DNS servers',
value : '8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844')

5
src/resolve/meson.build
View File

@ -139,6 +139,11 @@ libsystemd_resolve_core = static_library(
systemd_resolved_sources += [resolved_gperf_c, resolved_dnssd_gperf_c]
systemd_resolved_dependencies = [threads, libgpg_error, libm, libidn]
if conf.get('ENABLE_DNS_OVER_TLS') == 1
systemd_resolved_dependencies += [libgnutls]
endif
if conf.get('ENABLE_RESOLVE') == 1
install_data('org.freedesktop.resolve1.conf',
install_dir : dbuspolicydir)

4
src/resolve/resolved-conf.c
View File

@ -392,9 +392,9 @@ int manager_parse_config_file(Manager *m) {
}
#endif
#if ! HAVE_GNUTLS
#if ! ENABLE_DNS_OVER_TLS
if (m->dns_over_tls_mode != DNS_OVER_TLS_NO) {
log_warning("DNS-over-TLS option cannot be set to opportunistic when systemd-resolved is built without gnutls support. Turning off DNS-over-TLS support.");
log_warning("DNS-over-TLS option cannot be set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support.");
m->dns_over_tls_mode = DNS_OVER_TLS_NO;
}
#endif

4
src/resolve/resolved-dns-server.c
View File

@ -80,7 +80,7 @@ int dns_server_new(
s->linked = true;
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
/* Do not verify cerificate */
gnutls_certificate_allocate_credentials(&s->tls_cert_cred);
#endif
@ -121,7 +121,7 @@ DnsServer* dns_server_unref(DnsServer *s) {
dns_stream_unref(s->stream);
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_cert_cred)
gnutls_certificate_free_credentials(s->tls_cert_cred);

4
src/resolve/resolved-dns-server.h
View File

@ -3,7 +3,7 @@
#include "in-addr-util.h"
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
#include <gnutls/gnutls.h>
#endif
@ -56,7 +56,7 @@ struct DnsServer {
char *server_string;
DnsStream *stream;
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
gnutls_certificate_credentials_t tls_cert_cred;
gnutls_datum_t tls_session_data;
#endif

14
src/resolve/resolved-dns-stream.c
View File

@ -44,7 +44,7 @@ static int dns_stream_update_io(DnsStream *s) {
static int dns_stream_complete(DnsStream *s, int error) {
assert(s);
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_session && IN_SET(error, ETIMEDOUT, 0)) {
int r;
@ -197,7 +197,7 @@ static ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t i
assert(s);
assert(iov);
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_session && !(flags & WRITE_TLS_DATA)) {
ssize_t ss;
size_t i;
@ -257,7 +257,7 @@ static ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t i
static ssize_t dns_stream_read(DnsStream *s, void *buf, size_t count) {
ssize_t ss;
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_session) {
ss = gnutls_record_recv(s->tls_session, buf, count);
if (ss < 0) {
@ -290,7 +290,7 @@ static ssize_t dns_stream_read(DnsStream *s, void *buf, size_t count) {
return ss;
}
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
static ssize_t dns_stream_tls_writev(gnutls_transport_ptr_t p, const giovec_t * iov, int iovcnt) {
int r;
@ -320,7 +320,7 @@ static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *use
assert(s);
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_bye) {
assert(s->tls_session);
@ -505,7 +505,7 @@ DnsStream *dns_stream_unref(DnsStream *s) {
s->manager->n_dns_streams--;
}
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (s->tls_session)
gnutls_deinit(s->tls_session);
#endif
@ -586,7 +586,7 @@ int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd, co
return 0;
}
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
int dns_stream_connect_tls(DnsStream *s, gnutls_session_t tls_session) {
gnutls_transport_set_ptr2(tls_session, (gnutls_transport_ptr_t) (long) s->fd, s);
gnutls_transport_set_vec_push_function(tls_session, &dns_stream_tls_writev);

6
src/resolve/resolved-dns-stream.h
View File

@ -9,7 +9,7 @@ typedef struct DnsStream DnsStream;
#include "resolved-dns-transaction.h"
#include "resolved-manager.h"
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
#include <gnutls/gnutls.h>
#endif
@ -39,7 +39,7 @@ struct DnsStream {
union sockaddr_union tfo_address;
socklen_t tfo_salen;
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
gnutls_session_t tls_session;
int tls_handshake;
bool tls_bye;
@ -68,7 +68,7 @@ struct DnsStream {
};
int dns_stream_new(Manager *m, DnsStream **s, DnsProtocol protocol, int fd, const union sockaddr_union *tfo_address);
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
int dns_stream_connect_tls(DnsStream *s, gnutls_session_t tls_session);
#endif
DnsStream *dns_stream_unref(DnsStream *s);

8
src/resolve/resolved-dns-transaction.c
View File

@ -13,7 +13,7 @@
#include "resolved-llmnr.h"
#include "string-table.h"
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
#include <gnutls/socket.h>
#endif
@ -504,7 +504,7 @@ static int dns_transaction_on_stream_packet(DnsTransaction *t, DnsPacket *p) {
}
static int on_stream_connection(DnsStream *s) {
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
/* Store TLS Ticket for faster succesive TLS handshakes */
if (s->tls_session && s->server) {
if (s->server->tls_session_data.data)
@ -577,7 +577,7 @@ static int dns_transaction_emit_tcp(DnsTransaction *t) {
_cleanup_(dns_stream_unrefp) DnsStream *s = NULL;
union sockaddr_union sa;
int r;
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
gnutls_session_t gs;
#endif
@ -651,7 +651,7 @@ static int dns_transaction_emit_tcp(DnsTransaction *t) {
s->server = dns_server_ref(t->server);
}
#if HAVE_GNUTLS
#if ENABLE_DNS_OVER_TLS
if (DNS_SERVER_FEATURE_LEVEL_IS_TLS(t->current_feature_level)) {
r = gnutls_init(&gs, GNUTLS_CLIENT | GNUTLS_ENABLE_FALSE_START | GNUTLS_NONBLOCK);
if (r < 0)

4
src/resolve/resolved-link.c
View File

@ -353,9 +353,9 @@ void link_set_dns_over_tls_mode(Link *l, DnsOverTlsMode mode) {
assert(l);
#if ! HAVE_GNUTLS
#if ! ENABLE_DNS_OVER_TLS
if (mode != DNS_OVER_TLS_NO)
log_warning("DNS-over-TLS option for the link cannot be set to opportunistic when systemd-resolved is built without gnutls support. Turning off DNS-over-TLS support.");
log_warning("DNS-over-TLS option for the link cannot be set to opportunistic when systemd-resolved is built without DNS-over-TLS support. Turning off DNS-over-TLS support.");
return;
#endif