diff options
Diffstat (limited to 'src/libudev')
| -rw-r--r-- | src/libudev/libudev-private.h | 2 | ||||
| -rw-r--r-- | src/libudev/libudev-util.c | 64 |
2 files changed, 66 insertions, 0 deletions
diff --git a/src/libudev/libudev-private.h b/src/libudev/libudev-private.h index 8fd86f2934..af0f125c73 100644 --- a/src/libudev/libudev-private.h +++ b/src/libudev/libudev-private.h @@ -168,6 +168,8 @@ uint64_t util_string_bloom64(const char *str); /* libudev-util-private.c */ int util_delete_path(struct udev *udev, const char *path); +uid_t util_lookup_user(struct udev *udev, const char *user); +gid_t util_lookup_group(struct udev *udev, const char *group); int util_resolve_subsys_kernel(struct udev *udev, const char *string, char *result, size_t maxsize, int read_value); ssize_t print_kmsg(const char *fmt, ...) _printf_(1, 2); diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c index 93e78d5d07..d9cdde1751 100644 --- a/src/libudev/libudev-util.c +++ b/src/libudev/libudev-util.c @@ -77,6 +77,70 @@ int util_delete_path(struct udev *udev, const char *path) 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 (streq(user, "root")) + 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) + udev_err(udev, "specified user '%s' unknown\n", user); + else + udev_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 (streq(group, "root")) + 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) { + udev_err(udev, "specified group '%s' unknown\n", group); + } else { + udev_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) |