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[Qemu-devel] [PATCH -V6 05/21] virtio-9p: Add minimal set of FileOperati
From: |
Aneesh Kumar K.V |
Subject: |
[Qemu-devel] [PATCH -V6 05/21] virtio-9p: Add minimal set of FileOperations |
Date: |
Thu, 29 Apr 2010 17:44:47 +0530 |
From: Anthony Liguori <address@hidden>
Add minimal set of FileOperations and the corresponding implementations for
local fstype. These will be required for the FID management patches later on.
address@hidden: rpath fix ]
Signed-off-by: Anthony Liguori <address@hidden>
Signed-off-by: Aneesh Kumar K.V <address@hidden>
---
hw/file-op-9p.h | 5 +++
hw/virtio-9p-local.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
hw/virtio-9p.c | 43 ++++++++++++++++++++++++++-
3 files changed, 124 insertions(+), 2 deletions(-)
diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index 7cde63c..461df9e 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -27,6 +27,11 @@ typedef struct FsContext
typedef struct FileOperations
{
+ int (*lstat)(FsContext *, const char *, struct stat *);
+ ssize_t (*readlink)(FsContext *, const char *, char *, size_t);
+ int (*setuid)(FsContext *, uid_t);
+ int (*close)(FsContext *, int);
+ int (*closedir)(FsContext *, DIR *);
void *opaque;
} FileOperations;
#endif
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 379af60..880cd0a 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -12,6 +12,84 @@
*/
#include "virtio.h"
#include "virtio-9p.h"
+#include <pwd.h>
+#include <grp.h>
+
+static const char *rpath(FsContext *ctx, const char *path)
+{
+ /* FIXME: so wrong... */
+ static char buffer[4096];
+ snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
+ return buffer;
+}
+
+static int local_lstat(FsContext *ctx, const char *path, struct stat *stbuf)
+{
+ return lstat(rpath(ctx, path), stbuf);
+}
+
+static int local_setuid(FsContext *ctx, uid_t uid)
+{
+ struct passwd *pw;
+ gid_t groups[33];
+ int ngroups;
+ static uid_t cur_uid = -1;
+
+ if (cur_uid == uid) {
+ return 0;
+ }
+
+ if (setreuid(0, 0)) {
+ return -1;
+ }
+
+ pw = getpwuid(uid);
+ if (pw == NULL) {
+ return -1;
+ }
+
+ ngroups = 33;
+ if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) == -1) {
+ return -1;
+ }
+
+ if (setgroups(ngroups, groups)) {
+ return -1;
+ }
+
+ if (setregid(-1, pw->pw_gid)) {
+ return -1;
+ }
+
+ if (setreuid(-1, uid)) {
+ return -1;
+ }
+
+ cur_uid = uid;
+
+ return 0;
+}
+
+static ssize_t local_readlink(FsContext *ctx, const char *path,
+ char *buf, size_t bufsz)
+{
+ return readlink(rpath(ctx, path), buf, bufsz);
+}
+
+static int local_close(FsContext *ctx, int fd)
+{
+ return close(fd);
+}
+
+static int local_closedir(FsContext *ctx, DIR *dir)
+{
+ return closedir(dir);
+}
FileOperations local_ops = {
+ .lstat = local_lstat,
+ .setuid = local_setuid,
+ .readlink = local_readlink,
+ .close = local_close,
+ .closedir = local_closedir,
};
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 97e9b04..7668e52 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -21,6 +21,41 @@
int dotu = 1;
int debug_9p_pdu;
+static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf)
+{
+ return s->ops->lstat(&s->ctx, path->data, stbuf);
+}
+
+static int v9fs_do_setuid(V9fsState *s, uid_t uid)
+{
+ return s->ops->setuid(&s->ctx, uid);
+}
+
+static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString
*buf)
+{
+ ssize_t len;
+
+ buf->data = qemu_malloc(1024);
+
+ len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1);
+ if (len > -1) {
+ buf->size = len;
+ buf->data[len] = 0;
+ }
+
+ return len;
+}
+
+static int v9fs_do_close(V9fsState *s, int fd)
+{
+ return s->ops->close(&s->ctx, fd);
+}
+
+static int v9fs_do_closedir(V9fsState *s, DIR *dir)
+{
+ return s->ops->closedir(&s->ctx, dir);
+}
+
static void v9fs_string_init(V9fsString *str)
{
str->data = NULL;
@@ -437,9 +472,13 @@ static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu)
(void) v9fs_string_sprintf;
(void) v9fs_string_copy;
(void) v9fs_string_size;
-
-
+ (void) v9fs_do_lstat;
+ (void) v9fs_do_setuid;
+ (void) v9fs_do_readlink;
+ (void) v9fs_do_close;
+ (void) v9fs_do_closedir;
}
+
static void v9fs_version(V9fsState *s, V9fsPDU *pdu)
{
if (debug_9p_pdu) {
--
1.7.0.4.360.g11766c
- [Qemu-devel] [PATCH -V6 00/21] virtio-9p: paravirtual file system passthrough, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 01/21] virtio-9p: Create a commandline option -fsdev, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 03/21] virtio-9p: pdu processing support., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 02/21] virtio-9p: Add a virtio 9p device to qemu, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 06/21] virtio-9p: Add fid and qid management support., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 05/21] virtio-9p: Add minimal set of FileOperations,
Aneesh Kumar K.V <=
- [Qemu-devel] [PATCH -V6 04/21] virtio-9p: Add string manipulation support., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 07/21] virtio-9p: Add stat and mode related helper functions., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 08/21] virtio-9p: Add sg helper functions, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 09/21] virtio-9p: Add P9_TVERSION support, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 11/21] virtio-9p: Add P9_TSTAT support, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 10/21] virtio-9p: Add P9_TATTACH support., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 12/21] virtio-9p: Add P9_TWALK support, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 13/21] virtio-9p: Add P9_TOPEN support., Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 15/21] virtio-9p: Add P9_TCLUNK support, Aneesh Kumar K.V, 2010/04/29
- [Qemu-devel] [PATCH -V6 16/21] virtio-9p: Add P9_TWRITE support, Aneesh Kumar K.V, 2010/04/29