tests/utils/testapp/gen-ust-events-ns/gen-ust-events-ns.cpp

   1 /*
   2  * Copyright (C) 2019 Michael Jeanson <mjeanson@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   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 <sys/stat.h>
  18 #include <sys/types.h>
  19 #include <unistd.h>
  20
  21 #include <common/compat/tid.h>
  22 #include <common/macros.h>
  23
  24 #include "signal-helper.h"
  25 #include "utils.h"
  26
  27 #define TRACEPOINT_DEFINE
  28 #include "tp.h"
  29
  30 #define LTTNG_PROC_NS_PATH_MAX 40
  31
  32 /*
  33  * The runner of this test validates that the kernel supports the
  34  * namespace for which it is invoked. However, these defines are added
  35  * to allow tests to run on systems that support a given namespace,
  36  * but that use a libc that doesn't define its associated clone flag.
  37  */
  38 #ifndef CLONE_NEWNS
  39 #define CLONE_NEWNS     0x00020000
  40 #endif
  41 #ifndef CLONE_NEWCGROUP
  42 #define CLONE_NEWCGROUP 0x02000000
  43 #endif
  44 #ifndef CLONE_NEWUTS
  45 #define CLONE_NEWUTS    0x04000000
  46 #endif
  47 #ifndef CLONE_NEWIPC
  48 #define CLONE_NEWIPC    0x08000000
  49 #endif
  50 #ifndef CLONE_NEWUSER
  51 #define CLONE_NEWUSER   0x10000000
  52 #endif
  53 #ifndef CLONE_NEWPID
  54 #define CLONE_NEWPID    0x20000000
  55 #endif
  56 #ifndef CLONE_NEWNET
  57 #define CLONE_NEWNET    0x40000000
  58 #endif
  59 #ifndef CLONE_NEWTIME
  60 #define CLONE_NEWTIME   0x00000080
  61 #endif
  62
  63 static int nr_iter = 100;
  64 static int debug = 0;
  65 static char *ns_opt = NULL;
  66 static char *after_unshare_file_path = NULL;
  67 static char *before_second_event_file_path = NULL;
  68
  69 static
  70 struct poptOption opts[] = {
  71         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  72         { "debug", 'd', POPT_ARG_NONE, &debug, 0, "Enable debug output", NULL },
  73         { "ns", 'n', POPT_ARG_STRING, &ns_opt, 0, "Namespace short identifier", NULL },
  74         { "iter", 'i', POPT_ARG_INT, &nr_iter, 0, "Number of tracepoint iterations", NULL },
  75         { "after", 'a', POPT_ARG_STRING, &after_unshare_file_path, 0, "after_unshare_file_path,", NULL },
  76         { "before", 'b', POPT_ARG_STRING, &before_second_event_file_path, 0, "before_second_event_file_path,", NULL },
  77         POPT_AUTOHELP
  78         { NULL, 0, 0, NULL, 0 }
  79 };
  80
  81 static ATTR_FORMAT_PRINTF(1, 2)
  82 void debug_printf(const char *format, ...)
  83 {
  84         va_list args;
  85         va_start(args, format);
  86
  87         if (debug) {
  88                 vfprintf(stderr, format, args);
  89         }
  90
  91         va_end(args);
  92 }
  93
  94 static int get_ns_inum(const char *ns, ino_t *ns_inum)
  95 {
  96         int ret = -1;
  97         struct stat sb;
  98         char proc_ns_path[LTTNG_PROC_NS_PATH_MAX];
  99
 100         /*
 101          * /proc/thread-self was introduced in kernel v3.17
 102          */
 103         if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX,
 104                         "/proc/thread-self/ns/%s", ns) >= 0) {
 105                 if (stat(proc_ns_path, &sb) == 0) {
 106                         *ns_inum = sb.st_ino;
 107                         ret = 0;
 108                 }
 109                 goto end;
 110         }
 111
 112         if (snprintf(proc_ns_path, LTTNG_PROC_NS_PATH_MAX,
 113                         "/proc/self/task/%d/%s/net", lttng_gettid(), ns) >= 0) {
 114                 if (stat(proc_ns_path, &sb) == 0) {
 115                         *ns_inum = sb.st_ino;
 116                         ret = 0;
 117                 }
 118                 goto end;
 119         }
 120 end:
 121         return ret;
 122 }
 123
 124 static int do_the_needful(int ns_flag, const char *ns_str)
 125 {
 126         int ret = 0, i;
 127         ino_t ns1, ns2;
 128
 129         ret = get_ns_inum(ns_str, &ns1);
 130         if (ret) {
 131                 debug_printf("Failed to get ns inode number for namespace %s",
 132                                 ns_str);
 133                 ret = -1;
 134                 goto end;
 135         }
 136         debug_printf("Initial %s ns inode number:      %lu\n", ns_str, ns1);
 137
 138         for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
 139                 tracepoint(tp, tptest, ns1);
 140                 if (should_quit) {
 141                         break;
 142                 }
 143         }
 144
 145         ret = unshare(ns_flag);
 146         if (ret == -1) {
 147                 perror("Failed to unshare namespace");
 148                 goto end;
 149         }
 150
 151         ret = get_ns_inum(ns_str, &ns2);
 152         if (ret) {
 153                 debug_printf("Failed to get ns inode number for namespace %s",
 154                                 ns_str);
 155                 ret = -1;
 156                 goto end;
 157         }
 158         debug_printf("Post unshare %s ns inode number: %lu\n", ns_str, ns2);
 159
 160         /*
 161          * Signal that we emited the first event group and that the
 162          * unshare call is completed.
 163          */
 164         if (after_unshare_file_path) {
 165                 ret = create_file(after_unshare_file_path);
 166                 if (ret != 0) {
 167                         goto end;
 168                 }
 169         }
 170
 171         /* Wait on synchronization before writing second event group. */
 172         if (before_second_event_file_path) {
 173                 ret = wait_on_file(before_second_event_file_path);
 174                 if (ret != 0) {
 175                         goto end;
 176                 }
 177         }
 178
 179         for (i = 0; nr_iter < 0 || i < nr_iter; i++) {
 180                 tracepoint(tp, tptest, ns2);
 181                 if (should_quit) {
 182                         break;
 183                 }
 184         }
 185
 186 end:
 187         return ret;
 188 }
 189
 190 /*
 191  * Send X events, change NS, wait for file to sync with test script, send X
 192  * events in new NS
 193  */
 194 int main(int argc, const char **argv)
 195 {
 196         int opt;
 197         int ret = EXIT_SUCCESS;
 198         poptContext pc;
 199
 200         pc = poptGetContext(NULL, argc, argv, opts, 0);
 201         poptReadDefaultConfig(pc, 0);
 202
 203         if (argc < 2) {
 204                 poptPrintHelp(pc, stderr, 0);
 205                 ret = EXIT_FAILURE;
 206                 goto end;
 207         }
 208
 209         while ((opt = poptGetNextOpt(pc)) >= 0) {
 210                 switch (opt) {
 211                 default:
 212                         poptPrintUsage(pc, stderr, 0);
 213                         ret = EXIT_FAILURE;
 214                         goto end;
 215                 }
 216         }
 217
 218         if (opt < -1) {
 219                 /* An error occurred during option processing. */
 220                 poptPrintUsage(pc, stderr, 0);
 221                 fprintf(stderr, "%s: %s\n",
 222                                 poptBadOption(pc, POPT_BADOPTION_NOALIAS),
 223                                 poptStrerror(opt));
 224                 ret = EXIT_FAILURE;
 225                 goto end;
 226         }
 227
 228         if (ns_opt == NULL) {
 229                 poptPrintUsage(pc, stderr, 0);
 230                 ret = EXIT_FAILURE;
 231                 goto end;
 232         }
 233
 234         if (set_signal_handler()) {
 235                 ret = EXIT_FAILURE;
 236                 goto end;
 237         }
 238
 239         if (strncmp(ns_opt, "cgroup", 6) == 0) {
 240                 ret = do_the_needful(CLONE_NEWCGROUP, "cgroup");
 241         } else if (strncmp(ns_opt, "ipc", 3) == 0) {
 242                 ret = do_the_needful(CLONE_NEWIPC, "ipc");
 243         } else if (strncmp(ns_opt, "mnt", 3) == 0) {
 244                 ret = do_the_needful(CLONE_NEWNS, "mnt");
 245         } else if (strncmp(ns_opt, "net", 3) == 0) {
 246                 ret = do_the_needful(CLONE_NEWNET, "net");
 247         } else if (strncmp(ns_opt, "pid", 3) == 0) {
 248                 ret = do_the_needful(CLONE_NEWPID, "pid");
 249         } else if (strncmp(ns_opt, "time", 4) == 0) {
 250                 ret = do_the_needful(CLONE_NEWTIME, "time");
 251         } else if (strncmp(ns_opt, "user", 4) == 0) {
 252                 /*
 253                  * Will always fail, requires a single threaded application,
 254                  * which can't happen with UST.
 255                  */
 256                 ret = do_the_needful(CLONE_NEWUSER, "user");
 257         } else if (strncmp(ns_opt, "uts", 3) == 0) {
 258                 ret = do_the_needful(CLONE_NEWUTS, "uts");
 259         } else {
 260                 printf("invalid ns id\n");
 261                 ret = EXIT_FAILURE;
 262                 goto end;
 263         }
 264         ret = ret ? EXIT_FAILURE : EXIT_SUCCESS;
 265 end:
 266         poptFreeContext(pc);
 267         return ret;
 268 }