diff options
Diffstat (limited to 'src/libudev/libudev-util-private.c')
| -rw-r--r-- | src/libudev/libudev-util-private.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/src/libudev/libudev-util-private.c b/src/libudev/libudev-util-private.c new file mode 100644 index 0000000000..44ff02cc33 --- /dev/null +++ b/src/libudev/libudev-util-private.c @@ -0,0 +1,239 @@ +/* + * 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'; + + 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; + + 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; + struct passwd pwbuf; + struct passwd *pw; + uid_t uid; + size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX); + char *buf = alloca(buflen); + + 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; + struct group grbuf; + struct group *gr; + gid_t gid = 0; + size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX); + char *buf = NULL; + + if (strcmp(group, "root") == 0) + return 0; + gid = strtoul(group, &endptr, 10); + if (endptr[0] == '\0') + return gid; + 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'; + dbg(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); + dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result); + } + udev_device_unref(dev); + return 0; +} |