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135801fc MJ |
1 | /* |
2 | * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com> | |
3 | * | |
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. | |
7 | * | |
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 | |
11 | * for more details. | |
12 | * | |
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 | |
16 | */ | |
17 | ||
18 | #ifndef _GNU_SOURCE | |
19 | #define _GNU_SOURCE | |
20 | #endif | |
21 | ||
22 | #include <popt.h> | |
23 | #include <sched.h> | |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <sys/stat.h> | |
27 | #include <sys/types.h> | |
28 | #include <unistd.h> | |
29 | #include <stdarg.h> | |
30 | ||
31 | #include <common/compat/tid.h> | |
32 | ||
33 | #include "utils.h" | |
34 | #include "signal-helper.h" | |
35 | ||
36 | #define TRACEPOINT_DEFINE | |
37 | #include "tp.h" | |
38 | ||
39 | #define LTTNG_PROC_NS_PATH_MAX 40 | |
40 | ||
41 | static int nr_iter = 100; | |
42 | static int debug = 0; | |
43 | static char *ns_opt = NULL; | |
44 | static char *after_unshare_file_path = NULL; | |
45 | static char *before_second_event_file_path = NULL; | |
46 | ||
47 | static | |
48 | struct poptOption opts[] = { | |
49 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ | |
50 | { "debug", 'd', POPT_ARG_NONE, &debug, 0, "Enable debug output", NULL }, | |
51 | { "ns", 'n', POPT_ARG_STRING, &ns_opt, 0, "Namespace short identifier", NULL }, | |
52 | { "iter", 'i', POPT_ARG_INT, &nr_iter, 0, "Number of tracepoint iterations", NULL }, | |
53 | { "after", 'a', POPT_ARG_STRING, &after_unshare_file_path, 0, "after_unshare_file_path,", NULL }, | |
54 | { "before", 'b', POPT_ARG_STRING, &before_second_event_file_path, 0, "before_second_event_file_path,", NULL }, | |
55 | POPT_AUTOHELP | |
56 | { NULL, 0, 0, NULL, 0 } | |
57 | }; | |
58 | ||
59 | static | |
60 | void debug_printf(const char *format, ...) { | |
61 | va_list args; | |
62 | va_start(args, format); | |
63 | ||
64 | if (debug) | |
65 | vfprintf(stderr, format, args); | |
66 | ||
67 | va_end(args); | |
68 | } | |
69 | ||
70 | static | |
71 | ino_t get_ns_inum(char ns[]) { | |
72 | struct stat sb; | |
73 | char proc_ns_path[LTTNG_PROC_NS_PATH_MAX]; | |
74 | ||
75 | /* | |
76 | * /proc/thread-self was introduced in kernel v3.17 | |
77 | */ | |
78 | if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX, | |
79 | "/proc/thread-self/ns/%s", ns) >= 0) { | |
80 | if (stat(proc_ns_path, &sb) == 0) { | |
81 | return sb.st_ino; | |
82 | } | |
83 | } | |
84 | ||
85 | if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX, | |
86 | "/proc/self/task/%d/%s/net", | |
87 | gettid(), ns) >= 0) { | |
88 | ||
89 | if (stat(proc_ns_path, &sb) == 0) { | |
90 | return sb.st_ino; | |
91 | } | |
92 | } | |
93 | ||
94 | return 1; | |
95 | } | |
96 | ||
97 | static | |
98 | int do_the_needful(int ns_flag, char ns_str[]) { | |
99 | int ret = 0, i; | |
100 | ino_t ns1, ns2; | |
101 | ||
102 | ns1 = get_ns_inum(ns_str); | |
103 | debug_printf("Initial %s ns inode number: %lu\n", ns_str, ns1); | |
104 | ||
105 | for (i = 0; nr_iter < 0 || i < nr_iter; i++) { | |
106 | ||
107 | tracepoint(tp, tptest, ns1); | |
108 | ||
109 | if (should_quit) { | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | ret = unshare(ns_flag); | |
115 | ||
116 | if (ret == -1) { | |
117 | perror("unshare"); | |
118 | ret = 0; | |
119 | } | |
120 | ||
121 | ns2 = get_ns_inum(ns_str); | |
122 | debug_printf("Post unshare %s ns inode number: %lu\n", ns_str, ns2); | |
123 | ||
124 | /* | |
125 | * Signal that we emited the first event group and that the | |
126 | * unshare call is completed. | |
127 | */ | |
128 | if (after_unshare_file_path) { | |
129 | ret = create_file(after_unshare_file_path); | |
130 | ||
131 | if (ret != 0) { | |
132 | goto end; | |
133 | } | |
134 | } | |
135 | ||
136 | /* | |
137 | * Wait on synchronization before writing second event group. | |
138 | */ | |
139 | if (before_second_event_file_path) { | |
140 | ret = wait_on_file(before_second_event_file_path); | |
141 | if (ret != 0) { | |
142 | goto end; | |
143 | } | |
144 | } | |
145 | ||
146 | for (i = 0; nr_iter < 0 || i < nr_iter; i++) { | |
147 | ||
148 | tracepoint(tp, tptest, ns2); | |
149 | ||
150 | if (should_quit) { | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | end: | |
156 | return ret; | |
157 | } | |
158 | ||
159 | // Send X events, change NS, wait for file to sync with test script, send X events in new NS | |
160 | ||
161 | ||
162 | int main(int argc, const char **argv) { | |
163 | int opt; | |
164 | int ret = EXIT_SUCCESS; | |
165 | poptContext pc; | |
166 | ||
167 | pc = poptGetContext(NULL, argc, argv, opts, 0); | |
168 | poptReadDefaultConfig(pc, 0); | |
169 | ||
170 | if (argc < 2) { | |
171 | poptPrintHelp(pc, stderr, 0); | |
172 | ret = EXIT_FAILURE; | |
173 | goto end; | |
174 | } | |
175 | ||
176 | while ((opt = poptGetNextOpt(pc)) >= 0) { | |
177 | switch(opt) { | |
178 | default: | |
179 | poptPrintUsage(pc, stderr, 0); | |
180 | ret = EXIT_FAILURE; | |
181 | goto end; | |
182 | } | |
183 | } | |
184 | ||
185 | if (opt < -1) { | |
186 | /* an error occurred during option processing */ | |
187 | poptPrintUsage(pc, stderr, 0); | |
188 | fprintf(stderr, "%s: %s\n", | |
189 | poptBadOption(pc, POPT_BADOPTION_NOALIAS), | |
190 | poptStrerror(opt)); | |
191 | ret = EXIT_FAILURE; | |
192 | goto end; | |
193 | } | |
194 | ||
195 | if (ns_opt == NULL) { | |
196 | poptPrintUsage(pc, stderr, 0); | |
197 | ret = EXIT_FAILURE; | |
198 | goto end; | |
199 | } | |
200 | ||
201 | if (set_signal_handler()) { | |
202 | ret = EXIT_FAILURE; | |
203 | goto end; | |
204 | } | |
205 | ||
206 | if (strncmp(ns_opt, "cgroup", 3) == 0) { | |
207 | do_the_needful(CLONE_NEWCGROUP, "cgroup"); | |
208 | } else if (strncmp(ns_opt, "ipc", 3) == 0) { | |
209 | do_the_needful(CLONE_NEWIPC, "ipc"); | |
210 | } else if (strncmp(ns_opt, "mnt", 3) == 0) { | |
211 | do_the_needful(CLONE_NEWNS, "mnt"); | |
212 | } else if (strncmp(ns_opt, "net", 3) == 0) { | |
213 | do_the_needful(CLONE_NEWNET, "net"); | |
214 | } else if (strncmp(ns_opt, "pid", 3) == 0) { | |
215 | do_the_needful(CLONE_NEWPID, "pid"); | |
216 | } else if (strncmp(ns_opt, "user", 3) == 0) { | |
217 | // Will always fail, requires a single threaded application, which can't happen with UST. | |
218 | do_the_needful(CLONE_NEWUSER, "user"); | |
219 | } else if (strncmp(ns_opt, "uts", 3) == 0) { | |
220 | do_the_needful(CLONE_NEWUTS, "uts"); | |
221 | } else { | |
222 | printf("invalid ns id\n"); | |
223 | ret = EXIT_FAILURE; | |
224 | } | |
225 | ||
226 | end: | |
227 | poptFreeContext(pc); | |
228 | return ret; | |
229 | } |