static bool daemonized;
/** Non-NULL if we log to a file. */
static FILE *logfile;
+/* Realpath of the config file. */
+static char *config_file;
+/* derived from config file path */
+uint32_t ipc_key;
/** The read end of the signal pipe */
static int signal_pipe;
/** Process id of current pre-create-hook/rsync/post-create-hook process. */
va_end(argp);
}
-static char *get_config_file_name(void)
+static void set_config_file_name(void)
{
- char *home, *config_file;
- if (OPT_GIVEN(DSS, CONFIG_FILE))
- return dss_strdup(OPT_STRING_VAL(DSS, CONFIG_FILE));
- home = get_homedir();
- config_file = make_message("%s/.dssrc", home);
- free(home);
- return config_file;
+ if (OPT_GIVEN(DSS, CONFIG_FILE)) {
+ const char *arg = OPT_STRING_VAL(DSS, CONFIG_FILE);
+ config_file = realpath(arg, NULL);
+ if (!config_file) {
+ DSS_EMERG_LOG(("could not resolve path %s: %s\n", arg,
+ strerror(errno)));
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ char *home = get_homedir();
+ char *arg = make_message("%s/.dssrc", home);
+ free(home);
+ config_file = realpath(arg, NULL);
+ if (config_file)
+ free(arg);
+ else /* not fatal */
+ config_file = arg;
+ }
+ DSS_DEBUG_LOG(("config file: %s\n", config_file));
+ ipc_key = super_fast_hash((uint8_t *)config_file,
+ strlen(config_file), 0) >> 1;
}
static int send_signal(int sig, bool wait)
{
pid_t pid;
- char *config_file = get_config_file_name();
- int ret = get_dss_pid(config_file, &pid);
+ int ret = get_dss_pid(ipc_key, &pid);
unsigned ms = 32;
struct timespec ts;
- free(config_file);
if (ret < 0)
return ret;
if (OPT_GIVEN(DSS, DRY_RUN)) {
static int parse_config_file(bool sighup, const struct lls_command *cmd)
{
int ret, fd = -1;
- char *config_file = get_config_file_name();
struct stat statbuf;
void *map;
size_t sz;
if (fd >= 0)
close(fd);
out:
- free(config_file);
return ret;
}
static void lock_dss_or_die(void)
{
- char *config_file = get_config_file_name();
- int ret = lock_dss(config_file);
+ int ret = lock_dss(ipc_key);
- free(config_file);
if (ret < 0) {
DSS_EMERG_LOG(("failed to lock: %s\n", dss_strerror(-ret)));
exit(EXIT_FAILURE);
static int com_run(void)
{
int ret, fd = -1;
- char *config_file;
pid_t pid;
if (OPT_GIVEN(DSS, DRY_RUN)) {
DSS_ERROR_LOG(("dry run not supported by this command\n"));
return -E_SYNTAX;
}
- config_file = get_config_file_name();
- ret = get_dss_pid(config_file, &pid);
- free(config_file);
+ ret = get_dss_pid(ipc_key, &pid);
if (ret >= 0) {
DSS_ERROR_LOG(("pid %d\n", (int)pid));
return -E_ALREADY_RUNNING;
goto out;
}
lpr = cmdline_lpr;
+ set_config_file_name();
ret = parse_config_file(false /* no SIGHUP */, CMD_PTR(DSS));
if (ret < 0)
goto out;
lls_free_parse_result(sublpr, subcmd);
if (sublpr != cmdline_sublpr)
lls_free_parse_result(cmdline_sublpr, subcmd);
+ free(config_file);
exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
}
* SuperFastHash, by Paul Hsieh.
* http://www.azillionmonkeys.com/qed/hash.html
*/
-static uint32_t super_fast_hash(const uint8_t *data, uint32_t len, uint32_t hash)
+uint32_t super_fast_hash(const uint8_t *data, uint32_t len, uint32_t hash)
{
uint32_t tmp;
int rem = len & 3;
return hash;
}
-/*
- * Return the canonical absolute name of a given file name.
- *
- * Slightly modified version of glibc's realpath, Copyright (C)
- * 1996-2002,2004,2005,2006,2008 Free Software Foundation, Inc.
- *
- * A canonical name does not contain any `.', `..' components nor any repeated
- * path separators ('/') or symlinks. All path components must exist. The
- * result is malloc'd and must be freed by the caller.
- */
-static int dss_realpath(const char *name, char **resolved_path)
-{
- char *rpath = NULL, *dest, *extra_buf = NULL;
- const char *start, *end, *rpath_limit;
- long int path_max;
- int ret, num_links = 0;
-
- if (name[0] == '\0') {
- /*
- * As per Single Unix Specification V2 we must return an error
- * if the name argument points to an empty string.
- */
- ret = -ERRNO_TO_DSS_ERROR(ENOENT);
- goto error;
- }
-#ifdef PATH_MAX
- path_max = PATH_MAX;
-#else
- /*
- * From realpath(3): Asking pathconf(3) does not really help, since on
- * the one hand POSIX warns that the result of pathconf(3) may be
- * huge and unsuitable for mallocing memory. And on the other hand
- * pathconf(3) may return -1 to signify that PATH_MAX is not bounded.
- */
- path_max = pathconf(name, _PC_PATH_MAX);
- if (path_max <= 0 || path_max >= 4096)
- path_max = 4096;
-#endif
- rpath = dss_malloc(path_max);
- rpath_limit = rpath + path_max;
-
- if (name[0] != '/') {
- if (!getcwd(rpath, path_max)) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
- goto error;
- }
- dest = memchr(rpath, '\0', path_max);
- } else {
- rpath[0] = '/';
- dest = rpath + 1;
- }
-
- for (start = end = name; *start; start = end) {
- struct stat st;
- int n;
-
- /* Skip sequence of multiple path-separators. */
- while (*start == '/')
- ++start;
-
- /* Find end of path component. */
- for (end = start; *end && *end != '/'; ++end)
- /* Nothing. */ ;
-
- if (end - start == 0)
- break;
- else if (end - start == 1 && start[0] == '.')
- /* nothing */ ;
- else if (end - start == 2 && start[0] == '.' && start[1] == '.') {
- /* Back up to previous component, ignore if at root already. */
- if (dest > rpath + 1)
- while ((--dest)[-1] != '/') ;
- } else {
- size_t new_size;
-
- if (dest[-1] != '/')
- *dest++ = '/';
-
- if (dest + (end - start) >= rpath_limit) {
- ptrdiff_t dest_offset = dest - rpath;
-
- new_size = rpath_limit - rpath;
- if (end - start + 1 > path_max)
- new_size += end - start + 1;
- else
- new_size += path_max;
- rpath = dss_realloc(rpath, new_size);
- rpath_limit = rpath + new_size;
- dest = rpath + dest_offset;
- }
-
- memcpy(dest, start, end - start);
- dest += end - start;
- *dest = '\0';
-
- if (stat(rpath, &st) < 0) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
- goto error;
- }
-
- if (S_ISLNK(st.st_mode)) {
- char *buf = alloca(path_max);
- size_t len;
-
- if (++num_links > MAXSYMLINKS) {
- ret = -ERRNO_TO_DSS_ERROR(ELOOP);
- goto error;
- }
-
- n = readlink(rpath, buf, path_max - 1);
- if (n < 0) {
- ret = -ERRNO_TO_DSS_ERROR(errno);
- goto error;
- }
- buf[n] = '\0';
-
- if (!extra_buf)
- extra_buf = alloca(path_max);
-
- len = strlen(end);
- if ((long int) (n + len) >= path_max) {
- ret = -ERRNO_TO_DSS_ERROR(ENAMETOOLONG);
- goto error;
- }
-
- /* Careful here, end may be a pointer into extra_buf... */
- memmove(&extra_buf[n], end, len + 1);
- end = memcpy(extra_buf, buf, n);
-
- if (buf[0] == '/') /* It's an absolute symlink */
- dest = rpath + 1;
- else /* Back up to previous component, ignore if at root already: */
- if (dest > rpath + 1)
- while ((--dest)[-1] != '/')
- ; /* nothing */
- } else if (!S_ISDIR(st.st_mode) && *end != '\0') {
- ret = -ERRNO_TO_DSS_ERROR(ENOTDIR);
- goto error;
- }
- }
- }
- if (dest > rpath + 1 && dest[-1] == '/')
- --dest;
- *dest = '\0';
- *resolved_path = rpath;
- return 1;
-error:
- free(rpath);
- *resolved_path = NULL;
- return ret;
-}
-
-static int get_key_or_die(const char *config_file)
-{
- int ret;
- struct stat statbuf;
- char *rpath;
-
- assert(config_file);
- if (stat(config_file, &statbuf) == 0) {
- ret = dss_realpath(config_file, &rpath);
- if (ret < 0) {
- DSS_EMERG_LOG(("could not resolve path %s: %s\n", config_file,
- dss_strerror(-ret)));
- exit(EXIT_FAILURE);
- }
- DSS_DEBUG_LOG(("resolved path: %s\n", rpath));
- } else
- /*
- * This happens if the user did not specify a config file, and
- * the default config file does not exist. Another (unlikely)
- * possibility is that the config file was removed between
- * startup and this call. We don't care about these corner
- * cases too much and just use the unresolved path in this
- * case.
- */
- rpath = dss_strdup(config_file);
- ret = super_fast_hash((uint8_t *)rpath, strlen(rpath), 0) >> 1;
- free(rpath);
- return ret;
-}
-
static int mutex_get(key_t key, int flags)
{
int ret;
return false;
}
-int lock_dss(char *config_file)
+int lock_dss(uint32_t key)
{
int ret, id;
struct sembuf sops[4];
- key_t key = get_key_or_die(config_file);
ret = mutex_get(key, IPC_CREAT | 0600);
if (ret < 0)
return do_semop(id, sops, 4);
}
-int get_dss_pid(char *config_file, pid_t *pid)
+int get_dss_pid(uint32_t key, pid_t *pid)
{
int ret, semid;
- key_t key = get_key_or_die(config_file);
if (pid)
*pid = 0;
projects / dss.git / commitdiff