2 * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
4 * SPDX-License-Identifier: LGPL-2.1-only
19 #include <sys/types.h>
22 #include <common/compat/tid.h>
24 #include "signal-helper.h"
27 #define LTTNG_PROC_NS_PATH_MAX 40
30 * The runner of this test validates that the kernel supports the
31 * namespace for which it is invoked. However, these defines are added
32 * to allow tests to run on systems that support a given namespace,
33 * but that use a libc that doesn't define its associated clone flag.
36 #define CLONE_NEWNS 0x00020000
38 #ifndef CLONE_NEWCGROUP
39 #define CLONE_NEWCGROUP 0x02000000
42 #define CLONE_NEWUTS 0x04000000
45 #define CLONE_NEWIPC 0x08000000
48 #define CLONE_NEWUSER 0x10000000
51 #define CLONE_NEWPID 0x20000000
54 #define CLONE_NEWNET 0x40000000
57 #define CLONE_NEWTIME 0x00000080
61 static char *ns_opt
= NULL
;
62 static char *before_unshare_wait_file_path
= NULL
;
63 static char *after_unshare_wait_file_path
= NULL
;
64 static char *after_unshare_signal_file_path
= NULL
;
66 static struct poptOption opts
[] = {
67 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
68 { "debug", 'd', POPT_ARG_NONE
, &debug
, 0, "Enable debug output", NULL
},
69 { "ns", 'n', POPT_ARG_STRING
, &ns_opt
, 0, "Namespace short identifier", NULL
},
70 { "before", 'b', POPT_ARG_STRING
, &before_unshare_wait_file_path
, 0, "Wait for file before unshare", NULL
},
71 { "after", 'a', POPT_ARG_STRING
, &after_unshare_wait_file_path
, 0, "Wait for file after unshare", NULL
},
72 { "signal", 's', POPT_ARG_STRING
, &after_unshare_signal_file_path
, 0, "Create signal file after unshare", NULL
},
74 { NULL
, 0, 0, NULL
, 0 }
77 static void debug_printf(const char *format
, ...)
80 va_start(args
, format
);
83 vfprintf(stderr
, format
, args
);
89 static int get_ns_inum(const char *ns
, ino_t
*ns_inum
)
93 char proc_ns_path
[LTTNG_PROC_NS_PATH_MAX
];
96 * /proc/thread-self was introduced in kernel v3.17
98 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
99 "/proc/thread-self/ns/%s", ns
) >= 0) {
100 if (stat(proc_ns_path
, &sb
) == 0) {
101 *ns_inum
= sb
.st_ino
;
108 if (snprintf(proc_ns_path
, LTTNG_PROC_NS_PATH_MAX
,
109 "/proc/self/task/%d/%s/net", lttng_gettid(), ns
) >= 0) {
110 if (stat(proc_ns_path
, &sb
) == 0) {
111 *ns_inum
= sb
.st_ino
;
121 static int do_the_needful(int ns_flag
, const char *ns_str
)
126 ret
= get_ns_inum(ns_str
, &ns1
);
128 debug_printf("Failed to get ns inode number for namespace %s",
133 debug_printf("Initial %s ns inode number: %lu\n", ns_str
, ns1
);
135 /* Wait on synchronization before unshare. */
136 if (before_unshare_wait_file_path
) {
137 ret
= wait_on_file(before_unshare_wait_file_path
);
143 ret
= unshare(ns_flag
);
145 perror("Failed to unshare namespace");
149 ret
= get_ns_inum(ns_str
, &ns2
);
151 debug_printf("Failed to get ns inode number for namespace %s",
156 debug_printf("Post unshare %s ns inode number: %lu\n", ns_str
, ns2
);
158 /* Signal that the unshare call is completed. */
159 if (after_unshare_signal_file_path
) {
160 ret
= create_file(after_unshare_signal_file_path
);
166 /* Wait on synchronization after unshare. */
167 if (after_unshare_wait_file_path
) {
168 ret
= wait_on_file(after_unshare_wait_file_path
);
178 int main(int argc
, const char **argv
)
181 int ret
= EXIT_SUCCESS
;
184 pc
= poptGetContext(NULL
, argc
, argv
, opts
, 0);
185 poptReadDefaultConfig(pc
, 0);
188 poptPrintHelp(pc
, stderr
, 0);
193 while ((opt
= poptGetNextOpt(pc
)) >= 0) {
196 poptPrintUsage(pc
, stderr
, 0);
203 /* an error occurred during option processing */
204 poptPrintUsage(pc
, stderr
, 0);
205 fprintf(stderr
, "%s: %s\n",
206 poptBadOption(pc
, POPT_BADOPTION_NOALIAS
),
212 if (ns_opt
== NULL
) {
213 poptPrintUsage(pc
, stderr
, 0);
218 if (set_signal_handler()) {
223 if (strncmp(ns_opt
, "cgroup", 6) == 0) {
224 ret
= do_the_needful(CLONE_NEWCGROUP
, "cgroup");
225 } else if (strncmp(ns_opt
, "ipc", 3) == 0) {
226 ret
= do_the_needful(CLONE_NEWIPC
, "ipc");
227 } else if (strncmp(ns_opt
, "mnt", 3) == 0) {
228 ret
= do_the_needful(CLONE_NEWNS
, "mnt");
229 } else if (strncmp(ns_opt
, "net", 3) == 0) {
230 ret
= do_the_needful(CLONE_NEWNET
, "net");
231 } else if (strncmp(ns_opt
, "pid", 3) == 0) {
232 ret
= do_the_needful(CLONE_NEWPID
, "pid");
233 } else if (strncmp(ns_opt
, "time", 4) == 0) {
234 ret
= do_the_needful(CLONE_NEWTIME
, "time");
235 } else if (strncmp(ns_opt
, "user", 4) == 0) {
237 * Will always fail, requires a single threaded application,
238 * which can't happen with UST.
240 ret
= do_the_needful(CLONE_NEWUSER
, "user");
241 } else if (strncmp(ns_opt
, "uts", 3) == 0) {
242 ret
= do_the_needful(CLONE_NEWUTS
, "uts");
244 printf("invalid ns id\n");
248 ret
= ret
? EXIT_FAILURE
: EXIT_SUCCESS
;