tests/utils/testapp/gen-ns-events/gen-ns-events.c

   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 <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
  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
  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 }