--- /dev/null
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/param.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+static int create_path(struct udev *udev, const char *path, bool selinux)
+{
+ char p[UTIL_PATH_SIZE];
+ char *pos;
+ struct stat stats;
+ int err;
+
+ util_strscpy(p, sizeof(p), path);
+ pos = strrchr(p, '/');
+ if (pos == NULL)
+ return 0;
+ while (pos != p && pos[-1] == '/')
+ pos--;
+ if (pos == p)
+ return 0;
+ pos[0] = '\0';
+
+ dbg(udev, "stat '%s'\n", p);
+ if (stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ return 0;
+ else
+ return -ENOTDIR;
+ }
+
+ err = util_create_path(udev, p);
+ if (err != 0)
+ return err;
+
+ dbg(udev, "mkdir '%s'\n", p);
+ if (selinux)
+ udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
+ err = mkdir(p, 0755);
+ if (err != 0) {
+ err = -errno;
+ if (err == -EEXIST && stat(p, &stats) == 0) {
+ if ((stats.st_mode & S_IFMT) == S_IFDIR)
+ err = 0;
+ else
+ err = -ENOTDIR;
+ }
+ }
+ if (selinux)
+ udev_selinux_resetfscreatecon(udev);
+ return err;
+}
+
+int util_create_path(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, false);
+}
+
+int util_create_path_selinux(struct udev *udev, const char *path)
+{
+ return create_path(udev, path, true);
+}
+
+int util_delete_path(struct udev *udev, const char *path)
+{
+ char p[UTIL_PATH_SIZE];
+ char *pos;
+ int err = 0;
+
+ if (path[0] == '/')
+ while(path[1] == '/')
+ path++;
+ util_strscpy(p, sizeof(p), path);
+ pos = strrchr(p, '/');
+ if (pos == p || pos == NULL)
+ return 0;
+
+ for (;;) {
+ *pos = '\0';
+ pos = strrchr(p, '/');
+
+ /* don't remove the last one */
+ if ((pos == p) || (pos == NULL))
+ break;
+
+ err = rmdir(p);
+ if (err < 0) {
+ if (errno == ENOENT)
+ err = 0;
+ break;
+ }
+ }
+ return err;
+}
+
+uid_t util_lookup_user(struct udev *udev, const char *user)
+{
+ char *endptr;
+ size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ char buf[buflen];
+ struct passwd pwbuf;
+ struct passwd *pw;
+ uid_t uid;
+
+ if (strcmp(user, "root") == 0)
+ return 0;
+ uid = strtoul(user, &endptr, 10);
+ if (endptr[0] == '\0')
+ return uid;
+
+ errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
+ if (pw != NULL)
+ return pw->pw_uid;
+ if (errno == 0 || errno == ENOENT || errno == ESRCH)
+ err(udev, "specified user '%s' unknown\n", user);
+ else
+ err(udev, "error resolving user '%s': %m\n", user);
+ return 0;
+}
+
+gid_t util_lookup_group(struct udev *udev, const char *group)
+{
+ char *endptr;
+ size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ char *buf;
+ struct group grbuf;
+ struct group *gr;
+ gid_t gid = 0;
+
+ if (strcmp(group, "root") == 0)
+ return 0;
+ gid = strtoul(group, &endptr, 10);
+ if (endptr[0] == '\0')
+ return gid;
+ buf = NULL;
+ gid = 0;
+ for (;;) {
+ char *newbuf;
+
+ newbuf = realloc(buf, buflen);
+ if (!newbuf)
+ break;
+ buf = newbuf;
+ errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
+ if (gr != NULL) {
+ gid = gr->gr_gid;
+ } else if (errno == ERANGE) {
+ buflen *= 2;
+ continue;
+ } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
+ err(udev, "specified group '%s' unknown\n", group);
+ } else {
+ err(udev, "error resolving group '%s': %m\n", group);
+ }
+ break;
+ }
+ free(buf);
+ return gid;
+}
+
+/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
+int util_resolve_subsys_kernel(struct udev *udev, const char *string,
+ char *result, size_t maxsize, int read_value)
+{
+ char temp[UTIL_PATH_SIZE];
+ char *subsys;
+ char *sysname;
+ struct udev_device *dev;
+ char *attr;
+
+ if (string[0] != '[')
+ return -1;
+
+ util_strscpy(temp, sizeof(temp), string);
+
+ subsys = &temp[1];
+
+ sysname = strchr(subsys, '/');
+ if (sysname == NULL)
+ return -1;
+ sysname[0] = '\0';
+ sysname = &sysname[1];
+
+ attr = strchr(sysname, ']');
+ if (attr == NULL)
+ return -1;
+ attr[0] = '\0';
+ attr = &attr[1];
+ if (attr[0] == '/')
+ attr = &attr[1];
+ if (attr[0] == '\0')
+ attr = NULL;
+
+ if (read_value && attr == NULL)
+ return -1;
+
+ dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
+ if (dev == NULL)
+ return -1;
+
+ if (read_value) {
+ const char *val;
+
+ val = udev_device_get_sysattr_value(dev, attr);
+ if (val != NULL)
+ util_strscpy(result, maxsize, val);
+ else
+ result[0] = '\0';
+ info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ } else {
+ size_t l;
+ char *s;
+
+ s = result;
+ l = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
+ if (attr != NULL)
+ util_strpcpyl(&s, l, "/", attr, NULL);
+ info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ }
+ udev_device_unref(dev);
+ return 0;
+}
~ianmdlvl / elogind.git / blobdiff