2 * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
4 * This library is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License as published by the
6 * Free Software Foundation; version 2.1 of the License.
8 * This library is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include <sys/types.h>
32 #include <common/compat/tid.h>
34 #include "signal-helper.h"
37 #define LTTNG_PROC_NS_PATH_MAX 40
40 * The runner of this test validates that the kernel supports the
41 * namespace for which it is invoked. However, these defines are added
42 * to allow tests to run on systems that support a given namespace,
43 * but that use a libc that doesn't define its associated clone flag.
46 #define CLONE_NEWNS 0x00020000
48 #ifndef CLONE_NEWCGROUP
49 #define CLONE_NEWCGROUP 0x02000000
52 #define CLONE_NEWUTS 0x04000000
55 #define CLONE_NEWIPC 0x08000000
58 #define CLONE_NEWUSER 0x10000000
61 #define CLONE_NEWPID 0x20000000
64 #define CLONE_NEWNET 0x40000000
68 static char *ns_opt
= NULL
;
69 static char *before_unshare_wait_file_path
= NULL
;
70 static char *after_unshare_wait_file_path
= NULL
;
71 static char *after_unshare_signal_file_path
= NULL
;
73 static struct poptOption opts
[] = {
74 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
75 { "debug", 'd', POPT_ARG_NONE
, &debug
, 0, "Enable debug output", NULL
},
76 { "ns", 'n', POPT_ARG_STRING
, &ns_opt
, 0, "Namespace short identifier", NULL
},
77 { "before", 'b', POPT_ARG_STRING
, &before_unshare_wait_file_path
, 0, "Wait for file before unshare", NULL
},
78 { "after", 'a', POPT_ARG_STRING
, &after_unshare_wait_file_path
, 0, "Wait for file after unshare", NULL
},
79 { "signal", 's', POPT_ARG_STRING
, &after_unshare_signal_file_path
, 0, "Create signal file after unshare", NULL
},
81 { NULL
, 0, 0, NULL
, 0 }
84 static void debug_printf(const char *format
, ...)
87 va_start(args
, format
);
90 vfprintf(stderr
, format
, args
);
96 static int get_ns_inum(const char *ns
, ino_t
*ns_inum
)
100 char proc_ns_path
[LTTNG_PROC_NS_PATH_MAX
];
103 * /proc/thread-self was introduced in kernel v3.17
105 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
106 "/proc/thread-self/ns/%s", ns
) >= 0) {
107 if (stat(proc_ns_path
, &sb
) == 0) {
108 *ns_inum
= sb
.st_ino
;
115 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
116 "/proc/self/task/%d/%s/net", lttng_gettid(), ns
) >= 0) {
117 if (stat(proc_ns_path
, &sb
) == 0) {
118 *ns_inum
= sb
.st_ino
;
128 static int do_the_needful(int ns_flag
, const char *ns_str
)
133 ret
= get_ns_inum(ns_str
, &ns1
);
135 debug_printf("Failed to get ns inode number for namespace %s",
140 debug_printf("Initial %s ns inode number: %lu\n", ns_str
, ns1
);
142 /* Wait on synchronization before unshare. */
143 if (before_unshare_wait_file_path
) {
144 ret
= wait_on_file(before_unshare_wait_file_path
);
150 ret
= unshare(ns_flag
);
152 perror("Failed to unshare namespace");
156 ret
= get_ns_inum(ns_str
, &ns2
);
158 debug_printf("Failed to get ns inode number for namespace %s",
163 debug_printf("Post unshare %s ns inode number: %lu\n", ns_str
, ns2
);
165 /* Signal that the unshare call is completed. */
166 if (after_unshare_signal_file_path
) {
167 ret
= create_file(after_unshare_signal_file_path
);
173 /* Wait on synchronization after unshare. */
174 if (after_unshare_wait_file_path
) {
175 ret
= wait_on_file(after_unshare_wait_file_path
);
185 int main(int argc
, const char **argv
)
188 int ret
= EXIT_SUCCESS
;
191 pc
= poptGetContext(NULL
, argc
, argv
, opts
, 0);
192 poptReadDefaultConfig(pc
, 0);
195 poptPrintHelp(pc
, stderr
, 0);
200 while ((opt
= poptGetNextOpt(pc
)) >= 0) {
203 poptPrintUsage(pc
, stderr
, 0);
210 /* an error occurred during option processing */
211 poptPrintUsage(pc
, stderr
, 0);
212 fprintf(stderr
, "%s: %s\n",
213 poptBadOption(pc
, POPT_BADOPTION_NOALIAS
),
219 if (ns_opt
== NULL
) {
220 poptPrintUsage(pc
, stderr
, 0);
225 if (set_signal_handler()) {
230 if (strncmp(ns_opt
, "cgroup", 3) == 0) {
231 ret
= do_the_needful(CLONE_NEWCGROUP
, "cgroup");
232 } else if (strncmp(ns_opt
, "ipc", 3) == 0) {
233 ret
= do_the_needful(CLONE_NEWIPC
, "ipc");
234 } else if (strncmp(ns_opt
, "mnt", 3) == 0) {
235 ret
= do_the_needful(CLONE_NEWNS
, "mnt");
236 } else if (strncmp(ns_opt
, "net", 3) == 0) {
237 ret
= do_the_needful(CLONE_NEWNET
, "net");
238 } else if (strncmp(ns_opt
, "pid", 3) == 0) {
239 ret
= do_the_needful(CLONE_NEWPID
, "pid");
240 } else if (strncmp(ns_opt
, "user", 3) == 0) {
242 * Will always fail, requires a single threaded application,
243 * which can't happen with UST.
245 ret
= do_the_needful(CLONE_NEWUSER
, "user");
246 } else if (strncmp(ns_opt
, "uts", 3) == 0) {
247 ret
= do_the_needful(CLONE_NEWUTS
, "uts");
249 printf("invalid ns id\n");
253 ret
= ret
? EXIT_FAILURE
: EXIT_SUCCESS
;