Commit | Line | Data |
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5f0d4e78 MJ |
1 | /* |
2 | * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com> | |
3 | * | |
9d16b343 | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
5f0d4e78 | 5 | * |
5f0d4e78 MJ |
6 | */ |
7 | ||
8 | #ifndef _GNU_SOURCE | |
9 | #define _GNU_SOURCE | |
10 | #endif | |
11 | ||
12 | #include <popt.h> | |
13 | #include <sched.h> | |
14 | #include <stdarg.h> | |
15 | #include <stdio.h> | |
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
18 | #include <sys/stat.h> | |
19 | #include <sys/types.h> | |
20 | #include <unistd.h> | |
21 | ||
22 | #include <common/compat/tid.h> | |
23 | ||
24 | #include "signal-helper.h" | |
25 | #include "utils.h" | |
26 | ||
27 | #define LTTNG_PROC_NS_PATH_MAX 40 | |
28 | ||
93d0d1f7 JG |
29 | /* |
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. | |
34 | */ | |
35 | #ifndef CLONE_NEWNS | |
36 | #define CLONE_NEWNS 0x00020000 | |
37 | #endif | |
38 | #ifndef CLONE_NEWCGROUP | |
39 | #define CLONE_NEWCGROUP 0x02000000 | |
40 | #endif | |
41 | #ifndef CLONE_NEWUTS | |
42 | #define CLONE_NEWUTS 0x04000000 | |
43 | #endif | |
44 | #ifndef CLONE_NEWIPC | |
45 | #define CLONE_NEWIPC 0x08000000 | |
46 | #endif | |
47 | #ifndef CLONE_NEWUSER | |
48 | #define CLONE_NEWUSER 0x10000000 | |
49 | #endif | |
50 | #ifndef CLONE_NEWPID | |
51 | #define CLONE_NEWPID 0x20000000 | |
52 | #endif | |
53 | #ifndef CLONE_NEWNET | |
54 | #define CLONE_NEWNET 0x40000000 | |
55 | #endif | |
56 | ||
5f0d4e78 MJ |
57 | static int debug = 0; |
58 | static char *ns_opt = NULL; | |
59 | static char *before_unshare_wait_file_path = NULL; | |
60 | static char *after_unshare_wait_file_path = NULL; | |
61 | static char *after_unshare_signal_file_path = NULL; | |
62 | ||
63 | static struct poptOption opts[] = { | |
64 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
65 | { "debug", 'd', POPT_ARG_NONE, &debug, 0, "Enable debug output", NULL }, | |
66 | { "ns", 'n', POPT_ARG_STRING, &ns_opt, 0, "Namespace short identifier", NULL }, | |
67 | { "before", 'b', POPT_ARG_STRING, &before_unshare_wait_file_path, 0, "Wait for file before unshare", NULL }, | |
68 | { "after", 'a', POPT_ARG_STRING, &after_unshare_wait_file_path, 0, "Wait for file after unshare", NULL }, | |
69 | { "signal", 's', POPT_ARG_STRING, &after_unshare_signal_file_path, 0, "Create signal file after unshare", NULL }, | |
70 | POPT_AUTOHELP | |
71 | { NULL, 0, 0, NULL, 0 } | |
72 | }; | |
73 | ||
74 | static void debug_printf(const char *format, ...) | |
75 | { | |
76 | va_list args; | |
77 | va_start(args, format); | |
78 | ||
79 | if (debug) { | |
80 | vfprintf(stderr, format, args); | |
81 | } | |
82 | ||
83 | va_end(args); | |
84 | } | |
85 | ||
86 | static int get_ns_inum(const char *ns, ino_t *ns_inum) | |
87 | { | |
88 | int ret = 0; | |
89 | struct stat sb; | |
90 | char proc_ns_path[LTTNG_PROC_NS_PATH_MAX]; | |
91 | ||
92 | /* | |
93 | * /proc/thread-self was introduced in kernel v3.17 | |
94 | */ | |
95 | if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX, | |
96 | "/proc/thread-self/ns/%s", ns) >= 0) { | |
97 | if (stat(proc_ns_path, &sb) == 0) { | |
98 | *ns_inum = sb.st_ino; | |
99 | } else { | |
100 | ret = -1; | |
101 | } | |
102 | goto end; | |
103 | } | |
104 | ||
105 | if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX, | |
106 | "/proc/self/task/%d/%s/net", lttng_gettid(), ns) >= 0) { | |
107 | if (stat(proc_ns_path, &sb) == 0) { | |
108 | *ns_inum = sb.st_ino; | |
109 | } else { | |
110 | ret = -1; | |
111 | } | |
112 | goto end; | |
113 | } | |
114 | end: | |
115 | return ret; | |
116 | } | |
117 | ||
118 | static int do_the_needful(int ns_flag, const char *ns_str) | |
119 | { | |
120 | int ret = 0; | |
121 | ino_t ns1, ns2; | |
122 | ||
123 | ret = get_ns_inum(ns_str, &ns1); | |
124 | if (ret) { | |
125 | debug_printf("Failed to get ns inode number for namespace %s", | |
126 | ns_str); | |
127 | ret = -1; | |
128 | goto end; | |
129 | } | |
130 | debug_printf("Initial %s ns inode number: %lu\n", ns_str, ns1); | |
131 | ||
132 | /* Wait on synchronization before unshare. */ | |
133 | if (before_unshare_wait_file_path) { | |
134 | ret = wait_on_file(before_unshare_wait_file_path); | |
135 | if (ret != 0) { | |
136 | goto end; | |
137 | } | |
138 | } | |
139 | ||
140 | ret = unshare(ns_flag); | |
141 | if (ret == -1) { | |
142 | perror("Failed to unshare namespace"); | |
143 | goto end; | |
144 | } | |
145 | ||
146 | ret = get_ns_inum(ns_str, &ns2); | |
147 | if (ret) { | |
148 | debug_printf("Failed to get ns inode number for namespace %s", | |
149 | ns_str); | |
150 | ret = -1; | |
151 | goto end; | |
152 | } | |
153 | debug_printf("Post unshare %s ns inode number: %lu\n", ns_str, ns2); | |
154 | ||
155 | /* Signal that the unshare call is completed. */ | |
156 | if (after_unshare_signal_file_path) { | |
157 | ret = create_file(after_unshare_signal_file_path); | |
158 | if (ret != 0) { | |
159 | goto end; | |
160 | } | |
161 | } | |
162 | ||
163 | /* Wait on synchronization after unshare. */ | |
164 | if (after_unshare_wait_file_path) { | |
165 | ret = wait_on_file(after_unshare_wait_file_path); | |
166 | if (ret != 0) { | |
167 | goto end; | |
168 | } | |
169 | } | |
170 | ||
171 | end: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | int main(int argc, const char **argv) | |
176 | { | |
177 | int opt; | |
178 | int ret = EXIT_SUCCESS; | |
179 | poptContext pc; | |
180 | ||
181 | pc = poptGetContext(NULL, argc, argv, opts, 0); | |
182 | poptReadDefaultConfig(pc, 0); | |
183 | ||
184 | if (argc < 2) { | |
185 | poptPrintHelp(pc, stderr, 0); | |
186 | ret = EXIT_FAILURE; | |
187 | goto end; | |
188 | } | |
189 | ||
190 | while ((opt = poptGetNextOpt(pc)) >= 0) { | |
191 | switch (opt) { | |
192 | default: | |
193 | poptPrintUsage(pc, stderr, 0); | |
194 | ret = EXIT_FAILURE; | |
195 | goto end; | |
196 | } | |
197 | } | |
198 | ||
199 | if (opt < -1) { | |
200 | /* an error occurred during option processing */ | |
201 | poptPrintUsage(pc, stderr, 0); | |
202 | fprintf(stderr, "%s: %s\n", | |
203 | poptBadOption(pc, POPT_BADOPTION_NOALIAS), | |
204 | poptStrerror(opt)); | |
205 | ret = EXIT_FAILURE; | |
206 | goto end; | |
207 | } | |
208 | ||
209 | if (ns_opt == NULL) { | |
210 | poptPrintUsage(pc, stderr, 0); | |
211 | ret = EXIT_FAILURE; | |
212 | goto end; | |
213 | } | |
214 | ||
215 | if (set_signal_handler()) { | |
216 | ret = EXIT_FAILURE; | |
217 | goto end; | |
218 | } | |
219 | ||
220 | if (strncmp(ns_opt, "cgroup", 3) == 0) { | |
221 | ret = do_the_needful(CLONE_NEWCGROUP, "cgroup"); | |
222 | } else if (strncmp(ns_opt, "ipc", 3) == 0) { | |
223 | ret = do_the_needful(CLONE_NEWIPC, "ipc"); | |
224 | } else if (strncmp(ns_opt, "mnt", 3) == 0) { | |
225 | ret = do_the_needful(CLONE_NEWNS, "mnt"); | |
226 | } else if (strncmp(ns_opt, "net", 3) == 0) { | |
227 | ret = do_the_needful(CLONE_NEWNET, "net"); | |
228 | } else if (strncmp(ns_opt, "pid", 3) == 0) { | |
229 | ret = do_the_needful(CLONE_NEWPID, "pid"); | |
230 | } else if (strncmp(ns_opt, "user", 3) == 0) { | |
231 | /* | |
232 | * Will always fail, requires a single threaded application, | |
233 | * which can't happen with UST. | |
234 | */ | |
235 | ret = do_the_needful(CLONE_NEWUSER, "user"); | |
236 | } else if (strncmp(ns_opt, "uts", 3) == 0) { | |
237 | ret = do_the_needful(CLONE_NEWUTS, "uts"); | |
238 | } else { | |
239 | printf("invalid ns id\n"); | |
240 | ret = EXIT_FAILURE; | |
241 | goto end; | |
242 | } | |
243 | ret = ret ? EXIT_FAILURE : EXIT_SUCCESS; | |
244 | end: | |
245 | poptFreeContext(pc); | |
246 | return ret; | |
247 | } |