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1723d6b1cf
The SocketAddress 'fd' kind accepts the name of a file descriptor passed to the monitor with the 'getfd' command. This makes it impossible to use the 'fd' kind in cases where a monitor is not available. This can apply in handling command line argv at startup, or simply if internal code wants to use SocketAddress and pass a numeric FD it has acquired from elsewhere. Fortunately the 'getfd' command mandated that the FD names must not start with a leading digit. We can thus safely extend semantics of the SocketAddress 'fd' kind, to allow a purely numeric name to reference an file descriptor that QEMU already has open. There will be restrictions on when each kind can be used. In codepaths where we are handling a monitor command (ie cur_mon != NULL), we will only support use of named file descriptors as before. Use of FD numbers is still not permitted for monitor commands. In codepaths where we are not handling a monitor command (ie cur_mon == NULL), we will not support named file descriptors. Instead we can reference FD numers explicitly. This allows the app spawning QEMU to intentionally "leak" a pre-opened socket to QEMU and reference that in a SocketAddress definition, or for code inside QEMU to pass pre-opened FDs around. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
267 lines
6.6 KiB
C
267 lines
6.6 KiB
C
/*
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* Tests for util/qemu-sockets.c
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*
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* Copyright 2018 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qemu/sockets.h"
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#include "qapi/error.h"
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#include "socket-helpers.h"
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#include "monitor/monitor.h"
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static void test_fd_is_socket_bad(void)
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{
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char *tmp = g_strdup("qemu-test-util-sockets-XXXXXX");
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int fd = mkstemp(tmp);
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if (fd != 0) {
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unlink(tmp);
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}
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g_free(tmp);
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g_assert(fd >= 0);
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g_assert(!fd_is_socket(fd));
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close(fd);
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}
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static void test_fd_is_socket_good(void)
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{
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int fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
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g_assert(fd >= 0);
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g_assert(fd_is_socket(fd));
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close(fd);
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}
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static int mon_fd = -1;
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static const char *mon_fdname;
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int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp)
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{
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g_assert(cur_mon);
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g_assert(mon == cur_mon);
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if (mon_fd == -1 || !g_str_equal(mon_fdname, fdname)) {
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error_setg(errp, "No fd named %s", fdname);
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return -1;
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}
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return dup(mon_fd);
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}
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/* Syms in libqemustub.a are discarded at .o file granularity.
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* To replace monitor_get_fd() we must ensure everything in
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* stubs/monitor.c is defined, to make sure monitor.o is discarded
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* otherwise we get duplicate syms at link time.
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*/
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Monitor *cur_mon;
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void monitor_init(Chardev *chr, int flags) {}
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static void test_socket_fd_pass_name_good(void)
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{
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SocketAddress addr;
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int fd;
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cur_mon = g_malloc(1); /* Fake a monitor */
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mon_fdname = "myfd";
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mon_fd = qemu_socket(AF_INET, SOCK_STREAM, 0);
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g_assert_cmpint(mon_fd, >, STDERR_FILENO);
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup(mon_fdname);
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fd = socket_connect(&addr, &error_abort);
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g_assert_cmpint(fd, !=, -1);
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g_assert_cmpint(fd, !=, mon_fd);
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close(fd);
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fd = socket_listen(&addr, &error_abort);
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g_assert_cmpint(fd, !=, -1);
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g_assert_cmpint(fd, !=, mon_fd);
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close(fd);
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g_free(addr.u.fd.str);
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mon_fdname = NULL;
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close(mon_fd);
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mon_fd = -1;
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g_free(cur_mon);
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cur_mon = NULL;
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}
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static void test_socket_fd_pass_name_bad(void)
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{
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SocketAddress addr;
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Error *err = NULL;
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int fd;
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cur_mon = g_malloc(1); /* Fake a monitor */
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mon_fdname = "myfd";
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mon_fd = dup(STDOUT_FILENO);
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g_assert_cmpint(mon_fd, >, STDERR_FILENO);
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup(mon_fdname);
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fd = socket_connect(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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fd = socket_listen(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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g_free(addr.u.fd.str);
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mon_fdname = NULL;
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close(mon_fd);
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mon_fd = -1;
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g_free(cur_mon);
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cur_mon = NULL;
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}
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static void test_socket_fd_pass_name_nomon(void)
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{
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SocketAddress addr;
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Error *err = NULL;
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int fd;
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g_assert(cur_mon == NULL);
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup("myfd");
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fd = socket_connect(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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fd = socket_listen(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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g_free(addr.u.fd.str);
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}
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static void test_socket_fd_pass_num_good(void)
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{
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SocketAddress addr;
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int fd, sfd;
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g_assert(cur_mon == NULL);
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sfd = qemu_socket(AF_INET, SOCK_STREAM, 0);
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g_assert_cmpint(sfd, >, STDERR_FILENO);
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup_printf("%d", sfd);
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fd = socket_connect(&addr, &error_abort);
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g_assert_cmpint(fd, ==, sfd);
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fd = socket_listen(&addr, &error_abort);
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g_assert_cmpint(fd, ==, sfd);
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g_free(addr.u.fd.str);
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close(sfd);
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}
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static void test_socket_fd_pass_num_bad(void)
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{
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SocketAddress addr;
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Error *err = NULL;
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int fd, sfd;
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g_assert(cur_mon == NULL);
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sfd = dup(STDOUT_FILENO);
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup_printf("%d", sfd);
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fd = socket_connect(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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fd = socket_listen(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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g_free(addr.u.fd.str);
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close(sfd);
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}
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static void test_socket_fd_pass_num_nocli(void)
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{
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SocketAddress addr;
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Error *err = NULL;
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int fd;
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cur_mon = g_malloc(1); /* Fake a monitor */
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addr.type = SOCKET_ADDRESS_TYPE_FD;
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addr.u.fd.str = g_strdup_printf("%d", STDOUT_FILENO);
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fd = socket_connect(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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fd = socket_listen(&addr, &err);
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g_assert_cmpint(fd, ==, -1);
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error_free_or_abort(&err);
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g_free(addr.u.fd.str);
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}
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int main(int argc, char **argv)
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{
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bool has_ipv4, has_ipv6;
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socket_init();
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g_test_init(&argc, &argv, NULL);
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/* We're creating actual IPv4/6 sockets, so we should
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* check if the host running tests actually supports
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* each protocol to avoid breaking tests on machines
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* with either IPv4 or IPv6 disabled.
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*/
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if (socket_check_protocol_support(&has_ipv4, &has_ipv6) < 0) {
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return 1;
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}
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if (has_ipv4) {
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g_test_add_func("/util/socket/is-socket/bad",
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test_fd_is_socket_bad);
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g_test_add_func("/util/socket/is-socket/good",
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test_fd_is_socket_good);
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g_test_add_func("/socket/fd-pass/name/good",
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test_socket_fd_pass_name_good);
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g_test_add_func("/socket/fd-pass/name/bad",
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test_socket_fd_pass_name_bad);
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g_test_add_func("/socket/fd-pass/name/nomon",
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test_socket_fd_pass_name_nomon);
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g_test_add_func("/socket/fd-pass/num/good",
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test_socket_fd_pass_num_good);
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g_test_add_func("/socket/fd-pass/num/bad",
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test_socket_fd_pass_num_bad);
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g_test_add_func("/socket/fd-pass/num/nocli",
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test_socket_fd_pass_num_nocli);
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}
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return g_test_run();
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}
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