mirror of
https://github.com/falk-werner/webfuse-provider
synced 2024-10-27 20:44:10 +00:00
288 lines
7.5 KiB
C
288 lines
7.5 KiB
C
/* Why this tool is used:
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*
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* In order to test webfuse as a fuse filesystem, file system operations should be made.
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* To check for memory leaks, valgind (memcheck) is used.
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*
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* Early tests discovered some ugly behavior of valgrind:
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* - valgrind intercepts syscalls like open, read and write
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* - valgrind does not expect that syscalls are handled within the process to be checked
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*
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* There is a more or less (un-) documented switch, which changes valgrind's bevahior, but
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* this caused other problems.
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*
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* The second approach used GTests's death tests. Death tests were used quite a while,
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* until we discovered a configuration bug when running CTest:
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* - memory leaks did not lead to test error
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*
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* After fixing CTest configuration, memory leaks within the death tests were shown.
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* Which is correct, since death tests pematurely exits the program an therefore no
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* cleanup is done.
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*
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* Finally, it was decided to use good old popen together with this tool.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <getopt.h>
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struct command;
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typedef bool
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command_invoke_fn(
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struct command * command);
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struct command
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{
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command_invoke_fn * invoke;
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char * file;
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char * arg;
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bool success;
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bool has_arg;
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};
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static bool print_usage(
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struct command * command)
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{
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printf(
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"fs_check, (c) 2020 by Webfuse authors (https://github.com/falk-werner/webfuse)\n"
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"Checks file information\n"
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"\n"
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"Usage:\n"
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"\t./fs_check --command <command> --file <file> [--arg <arg>]\n"
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"\n"
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"Options:\n"
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"\t-c, --command - Check to perform (see below)\n"
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"\t-f, --file - Path to file to check\n"
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"\t-a, --arg - Argument, depending on command\n"
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"\n"
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"Commands:\n"
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"\tis_file - checks, if <file> is a regular file; no arg\n"
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"\tis_dir - checks, if <file> is a directory; no arg\n"
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"\thas_mode - checks, if <file> has the mode given in <arg>\n"
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"\thas_size - checks, if <file> has the size given in <arg>\n"
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"\thas_subdir - checks, if <file> contains the sub directory given in <arg>\n"
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"\thas_contents - checks, if <file> has the contents given in <arg>\n"
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);
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return command->success;
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}
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static bool is_file(
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struct command * command)
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{
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struct stat buffer;
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int rc = stat(command->file, &buffer);
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return ((0 == rc) && (S_ISREG(buffer.st_mode)));
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}
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static bool is_dir(
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struct command * command)
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{
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struct stat buffer;
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int rc = stat(command->file, &buffer);
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return ((0 == rc) && (S_ISDIR(buffer.st_mode)));
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}
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static bool has_mode(
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struct command * command)
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{
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mode_t mode = (mode_t) atoi(command->arg);
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struct stat buffer;
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int rc = stat(command->file, &buffer);
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return ((0 == rc) && (mode == (buffer.st_mode & 0777)));
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}
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static bool has_size(
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struct command * command)
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{
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int size = atoi(command->arg);
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struct stat buffer;
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int rc = stat(command->file, &buffer);
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return ((0 == rc) && (size == (buffer.st_size)));
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}
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static bool has_subdir(
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struct command * command)
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{
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bool result = false;
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char const * subdir = command->arg;
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DIR * dir = opendir(command->file);
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if (NULL != dir)
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{
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struct dirent * entry = readdir(dir);
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while (NULL != entry)
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{
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if (0 == strcmp(subdir, entry->d_name))
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{
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result = true;
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break;
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}
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entry = readdir(dir);
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}
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closedir(dir);
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}
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return result;
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}
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static bool has_contents(
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struct command * command)
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{
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bool result = false;
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char const * contents = command->arg;
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size_t length = strlen(contents);
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char * buffer = malloc(length);
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FILE * file = fopen(command->file, "rb");
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{
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ssize_t count = fread(buffer, 1, length, file);
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fclose(file);
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result = (count == (ssize_t) length) && (0 == strncmp(buffer, contents, length));
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}
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free(buffer);
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return result;
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}
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static bool get_command(
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struct command * command,
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char const * name)
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{
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static struct {
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char const * name;
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command_invoke_fn * invoke;
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bool has_arg;
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} commands[] =
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{
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{"is_file" , &is_file , false},
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{"is_dir" , &is_dir , false},
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{"has_mode" , &has_mode , true},
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{"has_size" , &has_size , true},
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{"has_subdir" , &has_subdir , true},
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{"has_contents", &has_contents, true},
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{NULL, NULL, false}
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};
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for (int i = 0; NULL != commands[i].name; i++)
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{
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if (0 == strcmp(commands[i].name, name))
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{
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command->invoke = commands[i].invoke;
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command->has_arg = commands[i].has_arg;
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return true;
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}
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}
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return false;
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}
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static void command_init(
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struct command * command,
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int argc,
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char * argv[])
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{
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static struct option const options[] =
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{
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{"file" , required_argument, NULL, 'f'},
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{"command", required_argument, NULL, 'c'},
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{"arg" , required_argument, NULL, 'a'},
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{"help" , no_argument , NULL, 'h'},
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{NULL, 0, NULL, 0}
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};
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command->invoke = &print_usage;
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command->file = NULL;
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command->arg = NULL;
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command->success = true;
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command->has_arg = false;
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optind = 0;
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bool is_finished = false;
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while (!is_finished)
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{
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int option_index = 0;
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int const c = getopt_long(argc, argv, "f:c:a:h", options, &option_index);
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switch(c)
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{
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case -1:
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is_finished = true;
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break;
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case 'c':
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if (!get_command(command, optarg))
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{
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fprintf(stderr, "error: unknown command\n");
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command->invoke = &print_usage;
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command->success = false;
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is_finished = true;
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}
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break;
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case 'f':
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free(command->file);
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command->file = strdup(optarg);
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break;
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case 'a':
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free(command->arg);
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command->arg = strdup(optarg);
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break;
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case 'h':
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command->invoke = &print_usage;
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break;
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default:
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fprintf(stderr, "error: unknown argument\n");
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command->invoke = &print_usage;
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command->success = false;
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is_finished = true;
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break;
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}
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}
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if (command->success)
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{
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if (NULL == command->file)
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{
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fprintf(stderr, "error: missing required arg: -f\n");
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command->invoke = &print_usage;
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command->success = false;
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}
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else if ((command->has_arg) && (NULL == command->arg))
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{
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fprintf(stderr, "error: missing required arg: -a\n");
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command->invoke = &print_usage;
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command->success = false;
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}
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}
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}
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static void command_cleanup(
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struct command * command)
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{
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free(command->file);
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free(command->arg);
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}
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int main(int argc, char* argv[])
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{
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struct command command;
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command_init(&command, argc, argv);
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bool success = command.invoke(&command);
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command_cleanup(&command);
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return success ? EXIT_SUCCESS : EXIT_FAILURE;
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} |