*/
#define _GNU_SOURCE
+#define _LGPL_SOURCE
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
-#include <regex.h>
#include <grp.h>
+#include <pwd.h>
+#include <sys/file.h>
+#include <dirent.h>
#include <common/common.h>
#include <common/runas.h>
+#include <common/compat/getenv.h>
#include "utils.h"
#include "defaults.h"
/* Cut the part we will be trying to resolve */
cut_path = strndup(path, next - path);
+ if (cut_path == NULL) {
+ PERROR("strndup");
+ goto error;
+ }
/* Try to resolve this part */
try_path = realpath((char *)cut_path, NULL);
* path are pointers for the same memory space
*/
cut_path = strdup(prev);
+ if (cut_path == NULL) {
+ PERROR("strdup");
+ goto error;
+ }
/* Concatenate the strings */
snprintf(resolved_path, size, "%s%s", try_path_prev, cut_path);
/* We prepare the start_path not containing it */
start_path = strndup(absolute_path, next - absolute_path);
-
+ if (!start_path) {
+ PERROR("strndup");
+ goto error;
+ }
/* And we concatenate it with the part after this string */
snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 2);
/* Then we prepare the start_path not containing it */
start_path = strndup(absolute_path, previous - absolute_path);
+ if (!start_path) {
+ PERROR("strndup");
+ goto error;
+ }
/* And we concatenate it with the part after the '/../' */
snprintf(absolute_path, PATH_MAX, "%s%s", start_path, next + 4);
ret = fprintf(fp, "%d\n", pid);
if (ret < 0) {
PERROR("fprintf pid file");
+ goto error;
}
- fclose(fp);
+ if (fclose(fp)) {
+ PERROR("fclose");
+ }
DBG("Pid %d written in file %s", pid, filepath);
+ ret = 0;
error:
return ret;
}
/*
- * Recursively create directory using the given path and mode.
+ * Create lock file to the given path and filename.
+ * Returns the associated file descriptor, -1 on error.
+ */
+LTTNG_HIDDEN
+int utils_create_lock_file(const char *filepath)
+{
+ int ret;
+ int fd;
+
+ assert(filepath);
+
+ fd = open(filepath, O_CREAT,
+ O_WRONLY | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
+ if (fd < 0) {
+ PERROR("open lock file %s", filepath);
+ ret = -1;
+ goto error;
+ }
+
+ /*
+ * Attempt to lock the file. If this fails, there is
+ * already a process using the same lock file running
+ * and we should exit.
+ */
+ ret = flock(fd, LOCK_EX | LOCK_NB);
+ if (ret) {
+ ERR("Could not get lock file %s, another instance is running.",
+ filepath);
+ if (close(fd)) {
+ PERROR("close lock file");
+ }
+ fd = ret;
+ goto error;
+ }
+
+error:
+ return fd;
+}
+
+/*
+ * Create directory using the given path and mode.
*
* On success, return 0 else a negative error code.
*/
LTTNG_HIDDEN
-int utils_mkdir_recursive(const char *path, mode_t mode)
+int utils_mkdir(const char *path, mode_t mode, int uid, int gid)
+{
+ int ret;
+
+ if (uid < 0 || gid < 0) {
+ ret = mkdir(path, mode);
+ } else {
+ ret = run_as_mkdir(path, mode, uid, gid);
+ }
+ if (ret < 0) {
+ if (errno != EEXIST) {
+ PERROR("mkdir %s, uid %d, gid %d", path ? path : "NULL",
+ uid, gid);
+ } else {
+ ret = 0;
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * Internal version of mkdir_recursive. Runs as the current user.
+ * Don't call directly; use utils_mkdir_recursive().
+ *
+ * This function is ominously marked as "unsafe" since it should only
+ * be called by a caller that has transitioned to the uid and gid under which
+ * the directory creation should occur.
+ */
+LTTNG_HIDDEN
+int _utils_mkdir_recursive_unsafe(const char *path, mode_t mode)
{
char *p, tmp[PATH_MAX];
size_t len;
ret = mkdir(tmp, mode);
if (ret < 0) {
if (errno != EEXIST) {
- PERROR("mkdir recursive last piece");
+ PERROR("mkdir recursive last element");
ret = -errno;
} else {
ret = 0;
return ret;
}
+/*
+ * Recursively create directory using the given path and mode, under the
+ * provided uid and gid.
+ *
+ * On success, return 0 else a negative error code.
+ */
+LTTNG_HIDDEN
+int utils_mkdir_recursive(const char *path, mode_t mode, int uid, int gid)
+{
+ int ret;
+
+ if (uid < 0 || gid < 0) {
+ /* Run as current user. */
+ ret = _utils_mkdir_recursive_unsafe(path, mode);
+ } else {
+ ret = run_as_mkdir_recursive(path, mode, uid, gid);
+ }
+ if (ret < 0) {
+ PERROR("mkdir %s, uid %d, gid %d", path ? path : "NULL",
+ uid, gid);
+ }
+
+ return ret;
+}
+
/*
* Create the stream tracefile on disk.
+ * path is the output parameter. It needs to be PATH_MAX len.
*
* Return 0 on success or else a negative value.
*/
return ret;
}
-/**
- * Prints the error message corresponding to a regex error code.
- *
- * @param errcode The error code.
- * @param regex The regex object that produced the error code.
- */
-static void regex_print_error(int errcode, regex_t *regex)
-{
- /* Get length of error message and allocate accordingly */
- size_t length;
- char *buffer;
-
- assert(regex != NULL);
-
- length = regerror(errcode, regex, NULL, 0);
- if (length == 0) {
- ERR("regerror returned a length of 0");
- return;
- }
-
- buffer = zmalloc(length);
- if (!buffer) {
- ERR("regex_print_error: zmalloc failed");
- return;
- }
-
- /* Get and print error message */
- regerror(errcode, regex, buffer, length);
- ERR("regex error: %s\n", buffer);
- free(buffer);
-
-}
/**
* Parse a string that represents a size in human readable format. It
- * supports decimal integers suffixed by 'k', 'M' or 'G'.
+ * supports decimal integers suffixed by 'k', 'K', 'M' or 'G'.
*
* The suffix multiply the integer by:
* 'k': 1024
* 'G': 1024^3
*
* @param str The string to parse.
- * @param size Pointer to a size_t that will be filled with the
+ * @param size Pointer to a uint64_t that will be filled with the
* resulting size.
*
* @return 0 on success, -1 on failure.
*/
LTTNG_HIDDEN
-int utils_parse_size_suffix(char *str, uint64_t *size)
+int utils_parse_size_suffix(const char * const str, uint64_t * const size)
{
- regex_t regex;
int ret;
- const int nmatch = 3;
- regmatch_t suffix_match, matches[nmatch];
- unsigned long long base_size;
+ uint64_t base_size;
long shift = 0;
+ const char *str_end;
+ char *num_end;
if (!str) {
- return 0;
- }
-
- /* Compile regex */
- ret = regcomp(®ex, "^\\(0x\\)\\{0,1\\}[0-9][0-9]*\\([kKMG]\\{0,1\\}\\)$", 0);
- if (ret != 0) {
- regex_print_error(ret, ®ex);
+ DBG("utils_parse_size_suffix: received a NULL string.");
ret = -1;
goto end;
}
- /* Match regex */
- ret = regexec(®ex, str, nmatch, matches, 0);
- if (ret != 0) {
+ /* strtoull will accept a negative number, but we don't want to. */
+ if (strchr(str, '-') != NULL) {
+ DBG("utils_parse_size_suffix: invalid size string, should not contain '-'.");
ret = -1;
- goto free;
+ goto end;
}
- /* There is a match ! */
+ /* str_end will point to the \0 */
+ str_end = str + strlen(str);
errno = 0;
- base_size = strtoull(str, NULL, 0);
+ base_size = strtoull(str, &num_end, 0);
if (errno != 0) {
- PERROR("strtoull");
+ PERROR("utils_parse_size_suffix strtoull");
ret = -1;
- goto free;
+ goto end;
}
- /* Check if there is a suffix */
- suffix_match = matches[2];
- if (suffix_match.rm_eo - suffix_match.rm_so == 1) {
- switch (*(str + suffix_match.rm_so)) {
- case 'K':
- case 'k':
- shift = KIBI_LOG2;
- break;
- case 'M':
- shift = MEBI_LOG2;
- break;
- case 'G':
- shift = GIBI_LOG2;
- break;
- default:
- ERR("parse_human_size: invalid suffix");
- ret = -1;
- goto free;
- }
+ if (num_end == str) {
+ /* strtoull parsed nothing, not good. */
+ DBG("utils_parse_size_suffix: strtoull had nothing good to parse.");
+ ret = -1;
+ goto end;
+ }
+
+ /* Check if a prefix is present. */
+ switch (*num_end) {
+ case 'G':
+ shift = GIBI_LOG2;
+ num_end++;
+ break;
+ case 'M': /* */
+ shift = MEBI_LOG2;
+ num_end++;
+ break;
+ case 'K':
+ case 'k':
+ shift = KIBI_LOG2;
+ num_end++;
+ break;
+ case '\0':
+ break;
+ default:
+ DBG("utils_parse_size_suffix: invalid suffix.");
+ ret = -1;
+ goto end;
+ }
+
+ /* Check for garbage after the valid input. */
+ if (num_end != str_end) {
+ DBG("utils_parse_size_suffix: Garbage after size string.");
+ ret = -1;
+ goto end;
}
*size = base_size << shift;
/* Check for overflow */
if ((*size >> shift) != base_size) {
- ERR("parse_size_suffix: oops, overflow detected.");
+ DBG("utils_parse_size_suffix: oops, overflow detected.");
ret = -1;
- goto free;
+ goto end;
}
ret = 0;
-
-free:
- regfree(®ex);
end:
return ret;
}
char *utils_get_home_dir(void)
{
char *val = NULL;
- val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR);
+ struct passwd *pwd;
+
+ val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR);
if (val != NULL) {
- return val;
+ goto end;
+ }
+ val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR);
+ if (val != NULL) {
+ goto end;
+ }
+
+ /* Fallback on the password file entry. */
+ pwd = getpwuid(getuid());
+ if (!pwd) {
+ goto end;
+ }
+ val = pwd->pw_dir;
+
+ DBG3("Home directory is '%s'", val);
+
+end:
+ return val;
+}
+
+/**
+ * Get user's home directory. Dynamically allocated, must be freed
+ * by the caller.
+ */
+LTTNG_HIDDEN
+char *utils_get_user_home_dir(uid_t uid)
+{
+ struct passwd pwd;
+ struct passwd *result;
+ char *home_dir = NULL;
+ char *buf = NULL;
+ long buflen;
+ int ret;
+
+ buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ if (buflen == -1) {
+ goto end;
+ }
+retry:
+ buf = zmalloc(buflen);
+ if (!buf) {
+ goto end;
+ }
+
+ ret = getpwuid_r(uid, &pwd, buf, buflen, &result);
+ if (ret || !result) {
+ if (ret == ERANGE) {
+ free(buf);
+ buflen *= 2;
+ goto retry;
+ }
+ goto end;
}
- return getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR);
+
+ home_dir = strdup(pwd.pw_dir);
+end:
+ free(buf);
+ return home_dir;
+}
+
+/*
+ * Obtain the value of LTTNG_KMOD_PROBES environment variable, if exists.
+ * Otherwise returns NULL.
+ */
+LTTNG_HIDDEN
+char *utils_get_kmod_probes_list(void)
+{
+ return lttng_secure_getenv(DEFAULT_LTTNG_KMOD_PROBES);
+}
+
+/*
+ * Obtain the value of LTTNG_EXTRA_KMOD_PROBES environment variable, if
+ * exists. Otherwise returns NULL.
+ */
+LTTNG_HIDDEN
+char *utils_get_extra_kmod_probes_list(void)
+{
+ return lttng_secure_getenv(DEFAULT_LTTNG_EXTRA_KMOD_PROBES);
}
/*
timeinfo = localtime(&rawtime);
ret = strftime(dst, len, format, timeinfo);
if (ret == 0) {
- ERR("Unable to strftime with format %s at dst %p of len %lu", format,
+ ERR("Unable to strftime with format %s at dst %p of len %zu", format,
dst, len);
}
break;
}
- optstring[str_pos++] = (char)long_options[i].val;
- if (long_options[i].has_arg) {
- optstring[str_pos++] = ':';
+ if (long_options[i].val != '\0') {
+ optstring[str_pos++] = (char) long_options[i].val;
+ if (long_options[i].has_arg) {
+ optstring[str_pos++] = ':';
+ }
}
}
end:
return optstring;
}
+
+/*
+ * Try to remove a hierarchy of empty directories, recursively. Don't unlink
+ * any file. Try to rmdir any empty directory within the hierarchy.
+ */
+LTTNG_HIDDEN
+int utils_recursive_rmdir(const char *path)
+{
+ DIR *dir;
+ int dir_fd, ret = 0, closeret, is_empty = 1;
+ struct dirent *entry;
+
+ /* Open directory */
+ dir = opendir(path);
+ if (!dir) {
+ PERROR("Cannot open '%s' path", path);
+ return -1;
+ }
+ dir_fd = dirfd(dir);
+ if (dir_fd < 0) {
+ PERROR("dirfd");
+ return -1;
+ }
+
+ while ((entry = readdir(dir))) {
+ if (!strcmp(entry->d_name, ".")
+ || !strcmp(entry->d_name, ".."))
+ continue;
+ switch (entry->d_type) {
+ case DT_DIR:
+ {
+ char subpath[PATH_MAX];
+
+ strncpy(subpath, path, PATH_MAX);
+ subpath[PATH_MAX - 1] = '\0';
+ strncat(subpath, "/",
+ PATH_MAX - strlen(subpath) - 1);
+ strncat(subpath, entry->d_name,
+ PATH_MAX - strlen(subpath) - 1);
+ if (utils_recursive_rmdir(subpath)) {
+ is_empty = 0;
+ }
+ break;
+ }
+ case DT_REG:
+ is_empty = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto end;
+ }
+ }
+end:
+ closeret = closedir(dir);
+ if (closeret) {
+ PERROR("closedir");
+ }
+ if (is_empty) {
+ DBG3("Attempting rmdir %s", path);
+ ret = rmdir(path);
+ }
+ return ret;
+}
projects / lttng-tools.git / blobdiff