X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=db2ed8e7d11dee928a6f96be4167a94669f015c6;hp=7f91dcb8151ea6ae6083668e78df123f73521758;hb=d77dded285b058e4242c8a3d2233f80e725ceefc;hpb=208ff148af91eb5ee6b2d88ada757c27be24d443

diff --git a/src/common/utils.c b/src/common/utils.c
index 7f91dcb81..db2ed8e7d 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -32,9 +32,11 @@
 #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"
@@ -530,12 +532,42 @@ error:
 }
 
 /*
- * Recursively create directory using the given path and mode.
+ * 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;
@@ -580,7 +612,7 @@ int utils_mkdir_recursive(const char *path, mode_t mode)
 	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;
@@ -591,8 +623,34 @@ error:
 	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.
  */
@@ -885,11 +943,11 @@ char *utils_get_home_dir(void)
 	char *val = NULL;
 	struct passwd *pwd;
 
-	val = getenv(DEFAULT_LTTNG_HOME_ENV_VAR);
+	val = lttng_secure_getenv(DEFAULT_LTTNG_HOME_ENV_VAR);
 	if (val != NULL) {
 		goto end;
 	}
-	val = getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR);
+	val = lttng_secure_getenv(DEFAULT_LTTNG_FALLBACK_HOME_ENV_VAR);
 	if (val != NULL) {
 		goto end;
 	}
@@ -954,7 +1012,7 @@ end:
 LTTNG_HIDDEN
 char *utils_get_kmod_probes_list(void)
 {
-	return getenv(DEFAULT_LTTNG_KMOD_PROBES);
+	return lttng_secure_getenv(DEFAULT_LTTNG_KMOD_PROBES);
 }
 
 /*
@@ -964,7 +1022,7 @@ char *utils_get_kmod_probes_list(void)
 LTTNG_HIDDEN
 char *utils_get_extra_kmod_probes_list(void)
 {
-	return getenv(DEFAULT_LTTNG_EXTRA_KMOD_PROBES);
+	return lttng_secure_getenv(DEFAULT_LTTNG_EXTRA_KMOD_PROBES);
 }
 
 /*
@@ -1048,12 +1106,77 @@ char *utils_generate_optstring(const struct option *long_options,
 			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;
+}