src/test/test-exec-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6   Copyright 2013 Thomas H.P. Andersen
   7 ***/
   8
   9 #include <errno.h>
  10 #include <string.h>
  11 #include <sys/stat.h>
  12 #include <sys/wait.h>
  13 #include <unistd.h>
  14
  15 #include "alloc-util.h"
  16 #include "copy.h"
  17 #include "def.h"
  18 #include "env-util.h"
  19 #include "exec-util.h"
  20 #include "fd-util.h"
  21 #include "fileio.h"
  22 #include "fs-util.h"
  23 #include "log.h"
  24 #include "macro.h"
  25 #include "rm-rf.h"
  26 #include "string-util.h"
  27 #include "strv.h"
  28
  29 static int here = 0, here2 = 0, here3 = 0;
  30 void *ignore_stdout_args[] = {&here, &here2, &here3};
  31
  32 /* noop handlers, just check that arguments are passed correctly */
  33 static int ignore_stdout_func(int fd, void *arg) {
  34         assert(fd >= 0);
  35         assert(arg == &here);
  36         safe_close(fd);
  37
  38         return 0;
  39 }
  40 static int ignore_stdout_func2(int fd, void *arg) {
  41         assert(fd >= 0);
  42         assert(arg == &here2);
  43         safe_close(fd);
  44
  45         return 0;
  46 }
  47 static int ignore_stdout_func3(int fd, void *arg) {
  48         assert(fd >= 0);
  49         assert(arg == &here3);
  50         safe_close(fd);
  51
  52         return 0;
  53 }
  54
  55 static const gather_stdout_callback_t ignore_stdout[] = {
  56         ignore_stdout_func,
  57         ignore_stdout_func2,
  58         ignore_stdout_func3,
  59 };
  60
  61 static void test_execute_directory(bool gather_stdout) {
  62         char template_lo[] = "/tmp/test-exec-util.lo.XXXXXXX";
  63         char template_hi[] = "/tmp/test-exec-util.hi.XXXXXXX";
  64         const char * dirs[] = {template_hi, template_lo, NULL};
  65         const char *name, *name2, *name3,
  66                 *overridden, *override,
  67                 *masked, *mask,
  68                 *masked2, *mask2,   /* the mask is non-executable */
  69                 *masked2e, *mask2e; /* the mask is executable */
  70
  71         log_info("/* %s (%s) */", __func__, gather_stdout ? "gathering stdout" : "asynchronous");
  72
  73         assert_se(mkdtemp(template_lo));
  74         assert_se(mkdtemp(template_hi));
  75
  76         name = strjoina(template_lo, "/script");
  77         name2 = strjoina(template_hi, "/script2");
  78         name3 = strjoina(template_lo, "/useless");
  79         overridden = strjoina(template_lo, "/overridden");
  80         override = strjoina(template_hi, "/overridden");
  81         masked = strjoina(template_lo, "/masked");
  82         mask = strjoina(template_hi, "/masked");
  83         masked2 = strjoina(template_lo, "/masked2");
  84         mask2 = strjoina(template_hi, "/masked2");
  85         masked2e = strjoina(template_lo, "/masked2e");
  86         mask2e = strjoina(template_hi, "/masked2e");
  87
  88         assert_se(write_string_file(name,
  89                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/it_works",
  90                                     WRITE_STRING_FILE_CREATE) == 0);
  91         assert_se(write_string_file(name2,
  92                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/it_works2",
  93                                     WRITE_STRING_FILE_CREATE) == 0);
  94         assert_se(write_string_file(overridden,
  95                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/failed",
  96                                     WRITE_STRING_FILE_CREATE) == 0);
  97         assert_se(write_string_file(override,
  98                                     "#!/bin/sh\necho 'Executing '$0",
  99                                     WRITE_STRING_FILE_CREATE) == 0);
 100         assert_se(write_string_file(masked,
 101                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/failed",
 102                                     WRITE_STRING_FILE_CREATE) == 0);
 103         assert_se(write_string_file(masked2,
 104                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/failed",
 105                                     WRITE_STRING_FILE_CREATE) == 0);
 106         assert_se(write_string_file(masked2e,
 107                                     "#!/bin/sh\necho 'Executing '$0\ntouch $(dirname $0)/failed",
 108                                     WRITE_STRING_FILE_CREATE) == 0);
 109         assert_se(symlink("/dev/null", mask) == 0);
 110         assert_se(touch(mask2) == 0);
 111         assert_se(touch(mask2e) == 0);
 112         assert_se(touch(name3) >= 0);
 113
 114         assert_se(chmod(name, 0755) == 0);
 115         assert_se(chmod(name2, 0755) == 0);
 116         assert_se(chmod(overridden, 0755) == 0);
 117         assert_se(chmod(override, 0755) == 0);
 118         assert_se(chmod(masked, 0755) == 0);
 119         assert_se(chmod(masked2, 0755) == 0);
 120         assert_se(chmod(masked2e, 0755) == 0);
 121         assert_se(chmod(mask2e, 0755) == 0);
 122
 123         if (gather_stdout)
 124                 execute_directories(dirs, DEFAULT_TIMEOUT_USEC, ignore_stdout, ignore_stdout_args, NULL);
 125         else
 126                 execute_directories(dirs, DEFAULT_TIMEOUT_USEC, NULL, NULL, NULL);
 127
 128         assert_se(chdir(template_lo) == 0);
 129         assert_se(access("it_works", F_OK) >= 0);
 130         assert_se(access("failed", F_OK) < 0);
 131
 132         assert_se(chdir(template_hi) == 0);
 133         assert_se(access("it_works2", F_OK) >= 0);
 134         assert_se(access("failed", F_OK) < 0);
 135
 136         (void) rm_rf(template_lo, REMOVE_ROOT|REMOVE_PHYSICAL);
 137         (void) rm_rf(template_hi, REMOVE_ROOT|REMOVE_PHYSICAL);
 138 }
 139
 140 static void test_execution_order(void) {
 141         char template_lo[] = "/tmp/test-exec-util-lo.XXXXXXX";
 142         char template_hi[] = "/tmp/test-exec-util-hi.XXXXXXX";
 143         const char *dirs[] = {template_hi, template_lo, NULL};
 144         const char *name, *name2, *name3, *overridden, *override, *masked, *mask;
 145         const char *output, *t;
 146         _cleanup_free_ char *contents = NULL;
 147
 148         assert_se(mkdtemp(template_lo));
 149         assert_se(mkdtemp(template_hi));
 150
 151         output = strjoina(template_hi, "/output");
 152
 153         log_info("/* %s >>%s */", __func__, output);
 154
 155         /* write files in "random" order */
 156         name2 = strjoina(template_lo, "/90-bar");
 157         name = strjoina(template_hi, "/80-foo");
 158         name3 = strjoina(template_lo, "/last");
 159         overridden = strjoina(template_lo, "/30-override");
 160         override = strjoina(template_hi, "/30-override");
 161         masked = strjoina(template_lo, "/10-masked");
 162         mask = strjoina(template_hi, "/10-masked");
 163
 164         t = strjoina("#!/bin/sh\necho $(basename $0) >>", output);
 165         assert_se(write_string_file(name, t, WRITE_STRING_FILE_CREATE) == 0);
 166
 167         t = strjoina("#!/bin/sh\necho $(basename $0) >>", output);
 168         assert_se(write_string_file(name2, t, WRITE_STRING_FILE_CREATE) == 0);
 169
 170         t = strjoina("#!/bin/sh\necho $(basename $0) >>", output);
 171         assert_se(write_string_file(name3, t, WRITE_STRING_FILE_CREATE) == 0);
 172
 173         t = strjoina("#!/bin/sh\necho OVERRIDDEN >>", output);
 174         assert_se(write_string_file(overridden, t, WRITE_STRING_FILE_CREATE) == 0);
 175
 176         t = strjoina("#!/bin/sh\necho $(basename $0) >>", output);
 177         assert_se(write_string_file(override, t, WRITE_STRING_FILE_CREATE) == 0);
 178
 179         t = strjoina("#!/bin/sh\necho MASKED >>", output);
 180         assert_se(write_string_file(masked, t, WRITE_STRING_FILE_CREATE) == 0);
 181
 182         assert_se(symlink("/dev/null", mask) == 0);
 183
 184         assert_se(chmod(name, 0755) == 0);
 185         assert_se(chmod(name2, 0755) == 0);
 186         assert_se(chmod(name3, 0755) == 0);
 187         assert_se(chmod(overridden, 0755) == 0);
 188         assert_se(chmod(override, 0755) == 0);
 189         assert_se(chmod(masked, 0755) == 0);
 190
 191         execute_directories(dirs, DEFAULT_TIMEOUT_USEC, ignore_stdout, ignore_stdout_args, NULL);
 192
 193         assert_se(read_full_file(output, &contents, NULL) >= 0);
 194         assert_se(streq(contents, "30-override\n80-foo\n90-bar\nlast\n"));
 195
 196         (void) rm_rf(template_lo, REMOVE_ROOT|REMOVE_PHYSICAL);
 197         (void) rm_rf(template_hi, REMOVE_ROOT|REMOVE_PHYSICAL);
 198 }
 199
 200 static int gather_stdout_one(int fd, void *arg) {
 201         char ***s = arg, *t;
 202         char buf[128] = {};
 203
 204         assert_se(s);
 205         assert_se(read(fd, buf, sizeof buf) >= 0);
 206         safe_close(fd);
 207
 208         assert_se(t = strndup(buf, sizeof buf));
 209         assert_se(strv_push(s, t) >= 0);
 210
 211         return 0;
 212 }
 213 static int gather_stdout_two(int fd, void *arg) {
 214         char ***s = arg, **t;
 215
 216         STRV_FOREACH(t, *s)
 217                 assert_se(write(fd, *t, strlen(*t)) == (ssize_t) strlen(*t));
 218         safe_close(fd);
 219
 220         return 0;
 221 }
 222 static int gather_stdout_three(int fd, void *arg) {
 223         char **s = arg;
 224         char buf[128] = {};
 225
 226         assert_se(read(fd, buf, sizeof buf - 1) > 0);
 227         safe_close(fd);
 228         assert_se(*s = strndup(buf, sizeof buf));
 229
 230         return 0;
 231 }
 232
 233 const gather_stdout_callback_t gather_stdout[] = {
 234         gather_stdout_one,
 235         gather_stdout_two,
 236         gather_stdout_three,
 237 };
 238
 239 static void test_stdout_gathering(void) {
 240         char template[] = "/tmp/test-exec-util.XXXXXXX";
 241         const char *dirs[] = {template, NULL};
 242         const char *name, *name2, *name3;
 243         int r;
 244
 245         char **tmp = NULL; /* this is only used in the forked process, no cleanup here */
 246         _cleanup_free_ char *output = NULL;
 247
 248         void* args[] = {&tmp, &tmp, &output};
 249
 250         assert_se(mkdtemp(template));
 251
 252         log_info("/* %s */", __func__);
 253
 254         /* write files */
 255         name = strjoina(template, "/10-foo");
 256         name2 = strjoina(template, "/20-bar");
 257         name3 = strjoina(template, "/30-last");
 258
 259         assert_se(write_string_file(name,
 260                                     "#!/bin/sh\necho a\necho b\necho c\n",
 261                                     WRITE_STRING_FILE_CREATE) == 0);
 262         assert_se(write_string_file(name2,
 263                                     "#!/bin/sh\necho d\n",
 264                                     WRITE_STRING_FILE_CREATE) == 0);
 265         assert_se(write_string_file(name3,
 266                                     "#!/bin/sh\nsleep 1",
 267                                     WRITE_STRING_FILE_CREATE) == 0);
 268
 269         assert_se(chmod(name, 0755) == 0);
 270         assert_se(chmod(name2, 0755) == 0);
 271         assert_se(chmod(name3, 0755) == 0);
 272
 273         r = execute_directories(dirs, DEFAULT_TIMEOUT_USEC, gather_stdout, args, NULL);
 274         assert_se(r >= 0);
 275
 276         log_info("got: %s", output);
 277
 278         assert_se(streq(output, "a\nb\nc\nd\n"));
 279 }
 280
 281 static void test_environment_gathering(void) {
 282         char template[] = "/tmp/test-exec-util.XXXXXXX", **p;
 283         const char *dirs[] = {template, NULL};
 284         const char *name, *name2, *name3;
 285         int r;
 286
 287         char **tmp = NULL; /* this is only used in the forked process, no cleanup here */
 288         _cleanup_strv_free_ char **env = NULL;
 289
 290         void* const args[] = { &tmp, &tmp, &env };
 291
 292         assert_se(mkdtemp(template));
 293
 294         log_info("/* %s */", __func__);
 295
 296         /* write files */
 297         name = strjoina(template, "/10-foo");
 298         name2 = strjoina(template, "/20-bar");
 299         name3 = strjoina(template, "/30-last");
 300
 301         assert_se(write_string_file(name,
 302                                     "#!/bin/sh\n"
 303                                     "echo A=23\n",
 304                                     WRITE_STRING_FILE_CREATE) == 0);
 305         assert_se(write_string_file(name2,
 306                                     "#!/bin/sh\n"
 307                                     "echo A=22:$A\n\n\n",            /* substitution from previous generator */
 308                                     WRITE_STRING_FILE_CREATE) == 0);
 309         assert_se(write_string_file(name3,
 310                                     "#!/bin/sh\n"
 311                                     "echo A=$A:24\n"
 312                                     "echo B=12\n"
 313                                     "echo C=000\n"
 314                                     "echo C=001\n"                    /* variable overwriting */
 315                                      /* various invalid entries */
 316                                     "echo unset A\n"
 317                                     "echo unset A=\n"
 318                                     "echo unset A=B\n"
 319                                     "echo unset \n"
 320                                     "echo A B=C\n"
 321                                     "echo A\n"
 322                                     /* test variable assignment without newline */
 323                                     "echo PATH=$PATH:/no/such/file",   /* no newline */
 324                                     WRITE_STRING_FILE_CREATE) == 0);
 325
 326         assert_se(chmod(name, 0755) == 0);
 327         assert_se(chmod(name2, 0755) == 0);
 328         assert_se(chmod(name3, 0755) == 0);
 329
 330         r = execute_directories(dirs, DEFAULT_TIMEOUT_USEC, gather_environment, args, NULL);
 331         assert_se(r >= 0);
 332
 333         STRV_FOREACH(p, env)
 334                 log_info("got env: \"%s\"", *p);
 335
 336         assert_se(streq(strv_env_get(env, "A"), "22:23:24"));
 337         assert_se(streq(strv_env_get(env, "B"), "12"));
 338         assert_se(streq(strv_env_get(env, "C"), "001"));
 339         assert_se(endswith(strv_env_get(env, "PATH"), ":/no/such/file"));
 340 }
 341
 342 int main(int argc, char *argv[]) {
 343         log_set_max_level(LOG_DEBUG);
 344         log_parse_environment();
 345         log_open();
 346
 347         test_execute_directory(true);
 348         test_execute_directory(false);
 349         test_execution_order();
 350         test_stdout_gathering();
 351         test_environment_gathering();
 352
 353         return 0;
 354 }