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