#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sys/stat.h>
#include <unistd.h>
#include <lttngerr.h>
{
return ((const char *) getenv("HOME"));
}
-
-/*
- * Create recursively directory using the FULL path.
- */
-static
-int _mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
- int ret;
- char *p, tmp[PATH_MAX];
- size_t len;
- mode_t old_umask;
-
- ret = snprintf(tmp, sizeof(tmp), "%s", path);
- if (ret < 0) {
- PERROR("snprintf mkdir");
- goto error;
- }
-
- len = ret;
- if (tmp[len - 1] == '/') {
- tmp[len - 1] = 0;
- }
-
- old_umask = umask(0);
- for (p = tmp + 1; *p; p++) {
- if (*p == '/') {
- *p = 0;
- ret = mkdir(tmp, mode);
- if (ret < 0) {
- if (!(errno == EEXIST)) {
- PERROR("mkdir recursive");
- ret = -errno;
- goto umask_error;
- }
- }
- *p = '/';
- }
- }
-
- ret = mkdir(tmp, mode);
- if (ret < 0) {
- if (!(errno == EEXIST)) {
- PERROR("mkdir recursive last piece");
- ret = -errno;
- } else {
- ret = 0;
- }
- }
-
-umask_error:
- umask(old_umask);
-error:
- return ret;
-}
-
-static
-int run_as(int (*cmd)(const char *path, mode_t mode, uid_t uid, gid_t gid),
- const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
- int ret = 0;
- pid_t pid;
-
- /*
- * If we are non-root, we can only deal with our own uid.
- */
- if (geteuid() != 0) {
- if (uid != geteuid()) {
- ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
- uid, geteuid());
- return -EPERM;
- }
- return (*cmd)(path, mode, uid, gid);
- }
-
- pid = fork();
- if (pid > 0) {
- int status;
-
- /*
- * Parent: wait for child to return, in which case the
- * shared memory map will have been created.
- */
- pid = wait(&status);
- if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
- ret = -1;
- goto end;
- }
- goto end;
- } else if (pid == 0) {
- /* Child */
- setegid(gid);
- if (ret < 0) {
- perror("setegid");
- exit(EXIT_FAILURE);
- }
- ret = seteuid(uid);
- if (ret < 0) {
- perror("seteuid");
- exit(EXIT_FAILURE);
- }
- ret = (*cmd)(path, mode, uid, gid);
- if (!ret)
- exit(EXIT_SUCCESS);
- else
- exit(EXIT_FAILURE);
- } else {
- return -1;
- }
-end:
- return ret;
-}
-
-int mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
- DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d",
- path, mode, uid, gid);
- return run_as(_mkdir_recursive, path, mode, uid, gid);
-}