diff options
Diffstat (limited to 'usr/src/lib/libc/port/gen/attrat.c')
| -rw-r--r-- | usr/src/lib/libc/port/gen/attrat.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/usr/src/lib/libc/port/gen/attrat.c b/usr/src/lib/libc/port/gen/attrat.c new file mode 100644 index 0000000000..f2a26d17cd --- /dev/null +++ b/usr/src/lib/libc/port/gen/attrat.c @@ -0,0 +1,273 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2007 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include "synonyms.h" +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <fcntl.h> +#include <mtlib.h> +#include <attr.h> +#include <sys/types.h> +#include <sys/syscall.h> +#include <sys/stat.h> +#include <sys/filio.h> +#include <unistd.h> +#include <dlfcn.h> +#include <stdio.h> + +static int (*nvpacker)(nvlist_t *, char **, size_t *, int, int); +static int (*nvsize)(nvlist_t *, size_t *, int); +static int (*nvunpacker)(char *, size_t, nvlist_t **); +static mutex_t attrlock = DEFAULTMUTEX; +static int initialized; +extern int __openattrdirat(int basefd, const char *name); + +static char *xattr_view_name[XATTR_VIEW_LAST] = { + VIEW_READONLY, + VIEW_READWRITE +}; + +static int +attrat_init() +{ + if (initialized == 0) { + lmutex_lock(&attrlock); + if (initialized == 1) { + lmutex_unlock(&attrlock); + return (0); + } + + void *libnvhandle = dlopen("libnvpair.so.1", RTLD_LAZY); + if (libnvhandle == NULL || (nvpacker = (int (*)(nvlist_t *, + char **, size_t *, int, int)) dlsym(libnvhandle, + "nvlist_pack")) == NULL || + (nvsize = (int (*)(nvlist_t *, + size_t *, int)) dlsym(libnvhandle, + "nvlist_size")) == NULL || + (nvunpacker = (int (*)(char *, size_t, + nvlist_t **)) dlsym(libnvhandle, + "nvlist_unpack")) == NULL) { + if (libnvhandle) + dlclose(libnvhandle); + lmutex_unlock(&attrlock); + return (EINVAL); + } + + initialized = 1; + lmutex_unlock(&attrlock); + } + return (0); +} + +static int +attr_nv_pack(nvlist_t *request, void **nv_request, size_t *nv_requestlen) +{ + size_t bufsize; + char *packbuf = NULL; + + if (nvsize(request, &bufsize, NV_ENCODE_XDR) != 0) { + return (EINVAL); + } + + packbuf = malloc(bufsize); + if (packbuf == NULL) + return (EINVAL); + if (nvpacker(request, &packbuf, &bufsize, NV_ENCODE_XDR, 0) != 0) { + free(packbuf); + } else { + *nv_request = (void *)packbuf; + *nv_requestlen = bufsize; + } + return (0); +} + +static const char * +view_to_name(xattr_view_t view) +{ + if (view >= XATTR_VIEW_LAST || view < 0) + return (NULL); + return (xattr_view_name[view]); +} + +static int +xattr_openat(int basefd, xattr_view_t view, int mode) +{ + const char *xattrname; + int xattrfd; + int oflag; + + switch (view) { + case XATTR_VIEW_READONLY: + oflag = O_RDONLY; + break; + case XATTR_VIEW_READWRITE: + oflag = mode & O_RDWR; + break; + default: + (void) __set_errno(EINVAL); + return (-1); + } + if (mode & O_XATTR) + oflag |= O_XATTR; + + xattrname = view_to_name(view); + xattrfd = openat(basefd, xattrname, oflag); + if (xattrfd < 0) + return (xattrfd); + /* Don't cache sysattr info (advisory) */ + (void) directio(xattrfd, DIRECTIO_ON); + return (xattrfd); +} + +static int +cgetattr(int fd, nvlist_t **response) +{ + int error; + int bytesread; + void *nv_response; + size_t nv_responselen; + struct stat buf; + + if (error = attrat_init()) + return (__set_errno(error)); + if ((error = fstat(fd, &buf)) != 0) + return (__set_errno(error)); + nv_responselen = buf.st_size; + + if ((nv_response = malloc(nv_responselen)) == NULL) + return (__set_errno(ENOMEM)); + bytesread = read(fd, nv_response, nv_responselen); + if (bytesread != nv_responselen) + return (__set_errno(EFAULT)); + + error = nvunpacker(nv_response, nv_responselen, response); + free(nv_response); + return (error); +} + +static int +csetattr(int fd, nvlist_t *request) +{ + int error, saveerrno; + int byteswritten; + void *nv_request; + size_t nv_requestlen; + + if (error = attrat_init()) + return (__set_errno(error)); + + if ((error = attr_nv_pack(request, &nv_request, &nv_requestlen)) != 0) + return (__set_errno(error)); + + (void) __set_errno(0); + byteswritten = write(fd, nv_request, nv_requestlen); + if (byteswritten != nv_requestlen) { + saveerrno = errno; + free(nv_request); + errno = saveerrno; + return (__set_errno(errno)); + } + + free(nv_request); + return (0); +} + +int +fgetattr(int basefd, xattr_view_t view, nvlist_t **response) +{ + int error, saveerrno, xattrfd; + + if ((xattrfd = xattr_openat(basefd, view, O_XATTR)) < 0) + return (xattrfd); + + error = cgetattr(xattrfd, response); + saveerrno = errno; + (void) close(xattrfd); + errno = saveerrno; + return (error); +} + +int +fsetattr(int basefd, xattr_view_t view, nvlist_t *request) +{ + int error, saveerrno, xattrfd; + + if ((xattrfd = xattr_openat(basefd, view, O_RDWR | O_XATTR)) < 0) + return (xattrfd); + error = csetattr(xattrfd, request); + saveerrno = errno; + (void) close(xattrfd); + errno = saveerrno; + return (error); +} + +int +getattrat(int basefd, xattr_view_t view, const char *name, nvlist_t **response) +{ + int error, saveerrno, namefd, xattrfd; + + if ((namefd = __openattrdirat(basefd, name)) < 0) + return (namefd); + + if ((xattrfd = xattr_openat(namefd, view, 0)) < 0) { + saveerrno = errno; + (void) close(namefd); + errno = saveerrno; + return (xattrfd); + } + + error = cgetattr(xattrfd, response); + saveerrno = errno; + (void) close(namefd); + (void) close(xattrfd); + errno = saveerrno; + return (error); +} + +int +setattrat(int basefd, xattr_view_t view, const char *name, nvlist_t *request) +{ + int error, saveerrno, namefd, xattrfd; + + if ((namefd = __openattrdirat(basefd, name)) < 0) + return (namefd); + + if ((xattrfd = xattr_openat(namefd, view, O_RDWR)) < 0) { + saveerrno = errno; + (void) close(namefd); + errno = saveerrno; + return (xattrfd); + } + + error = csetattr(xattrfd, request); + saveerrno = errno; + (void) close(namefd); + (void) close(xattrfd); + errno = saveerrno; + return (error); +} |