qga: implement file commands for Windows guest
The following commands are implemented: - guest_file_open - guest_file_close - guest_file_write - guest_file_read - guest_file_seek - guest_file_flush Motivation is quite simple: Windows guests should be supported with the same set of features as Linux one. Also this patch is a prerequisite for Windows guest-exec command support. Signed-off-by: Olga Krishtal <okrishtal@parallels.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Olga Krishtal
Michael Roth
parent
85b6f6f535
commit
fa193594fb
@ -14,10 +14,13 @@
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#include <glib.h>
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#include <wtypes.h>
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#include <powrprof.h>
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#include <stdio.h>
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#include <string.h>
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#include "qga/guest-agent-core.h"
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#include "qga/vss-win32.h"
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#include "qga-qmp-commands.h"
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#include "qapi/qmp/qerror.h"
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#include "qemu/queue.h"
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#ifndef SHTDN_REASON_FLAG_PLANNED
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#define SHTDN_REASON_FLAG_PLANNED 0x80000000
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@ -29,6 +32,146 @@
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(365 * (1970 - 1601) + \
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(1970 - 1601) / 4 - 3))
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#define INVALID_SET_FILE_POINTER ((DWORD)-1)
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typedef struct GuestFileHandle {
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int64_t id;
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HANDLE fh;
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QTAILQ_ENTRY(GuestFileHandle) next;
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} GuestFileHandle;
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static struct {
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QTAILQ_HEAD(, GuestFileHandle) filehandles;
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} guest_file_state;
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typedef struct OpenFlags {
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const char *forms;
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DWORD desired_access;
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DWORD creation_disposition;
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} OpenFlags;
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static OpenFlags guest_file_open_modes[] = {
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{"r", GENERIC_READ, OPEN_EXISTING},
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{"rb", GENERIC_READ, OPEN_EXISTING},
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{"w", GENERIC_WRITE, CREATE_ALWAYS},
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{"wb", GENERIC_WRITE, CREATE_ALWAYS},
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{"a", GENERIC_WRITE, OPEN_ALWAYS },
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{"r+", GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
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{"rb+", GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
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{"r+b", GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
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{"w+", GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
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{"wb+", GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
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{"w+b", GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
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{"a+", GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS },
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{"ab+", GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS },
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{"a+b", GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS }
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};
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static OpenFlags *find_open_flag(const char *mode_str)
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{
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int mode;
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Error **errp = NULL;
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for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
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OpenFlags *flags = guest_file_open_modes + mode;
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if (strcmp(flags->forms, mode_str) == 0) {
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return flags;
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}
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}
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error_setg(errp, "invalid file open mode '%s'", mode_str);
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return NULL;
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}
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static int64_t guest_file_handle_add(HANDLE fh, Error **errp)
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{
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GuestFileHandle *gfh;
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int64_t handle;
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handle = ga_get_fd_handle(ga_state, errp);
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if (handle < 0) {
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return -1;
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}
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gfh = g_malloc0(sizeof(GuestFileHandle));
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gfh->id = handle;
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gfh->fh = fh;
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QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
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return handle;
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}
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static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
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{
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GuestFileHandle *gfh;
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QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next) {
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if (gfh->id == id) {
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return gfh;
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}
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}
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error_setg(errp, "handle '%" PRId64 "' has not been found", id);
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return NULL;
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}
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int64_t qmp_guest_file_open(const char *path, bool has_mode,
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const char *mode, Error **errp)
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{
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int64_t fd;
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HANDLE fh;
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HANDLE templ_file = NULL;
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DWORD share_mode = FILE_SHARE_READ;
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DWORD flags_and_attr = FILE_ATTRIBUTE_NORMAL;
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LPSECURITY_ATTRIBUTES sa_attr = NULL;
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OpenFlags *guest_flags;
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if (!has_mode) {
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mode = "r";
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}
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slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
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guest_flags = find_open_flag(mode);
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if (guest_flags == NULL) {
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error_setg(errp, "invalid file open mode");
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return -1;
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}
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fh = CreateFile(path, guest_flags->desired_access, share_mode, sa_attr,
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guest_flags->creation_disposition, flags_and_attr,
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templ_file);
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if (fh == INVALID_HANDLE_VALUE) {
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error_setg_win32(errp, GetLastError(), "failed to open file '%s'",
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path);
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return -1;
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}
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fd = guest_file_handle_add(fh, errp);
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if (fd < 0) {
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CloseHandle(&fh);
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error_setg(errp, "failed to add handle to qmp handle table");
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return -1;
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}
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slog("guest-file-open, handle: % " PRId64, fd);
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return fd;
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}
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void qmp_guest_file_close(int64_t handle, Error **errp)
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{
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bool ret;
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GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
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slog("guest-file-close called, handle: %" PRId64, handle);
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if (gfh == NULL) {
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return;
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}
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ret = CloseHandle(gfh->fh);
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if (!ret) {
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error_setg_win32(errp, GetLastError(), "failed close handle");
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return;
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}
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QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
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g_free(gfh);
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}
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static void acquire_privilege(const char *name, Error **errp)
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{
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HANDLE token = NULL;
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@ -113,43 +256,130 @@ void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
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}
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}
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int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
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Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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return 0;
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}
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void qmp_guest_file_close(int64_t handle, Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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}
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GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
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int64_t count, Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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return 0;
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GuestFileRead *read_data = NULL;
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guchar *buf;
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HANDLE fh;
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bool is_ok;
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DWORD read_count;
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GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
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if (!gfh) {
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return NULL;
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}
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if (!has_count) {
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count = QGA_READ_COUNT_DEFAULT;
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} else if (count < 0) {
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error_setg(errp, "value '%" PRId64
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"' is invalid for argument count", count);
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return NULL;
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}
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fh = gfh->fh;
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buf = g_malloc0(count+1);
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is_ok = ReadFile(fh, buf, count, &read_count, NULL);
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if (!is_ok) {
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error_setg_win32(errp, GetLastError(), "failed to read file");
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slog("guest-file-read failed, handle %" PRId64, handle);
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} else {
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buf[read_count] = 0;
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read_data = g_malloc0(sizeof(GuestFileRead));
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read_data->count = (size_t)read_count;
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read_data->eof = read_count == 0;
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if (read_count != 0) {
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read_data->buf_b64 = g_base64_encode(buf, read_count);
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}
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}
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g_free(buf);
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return read_data;
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}
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GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
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bool has_count, int64_t count,
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Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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return 0;
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GuestFileWrite *write_data = NULL;
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guchar *buf;
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gsize buf_len;
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bool is_ok;
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DWORD write_count;
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GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
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HANDLE fh;
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if (!gfh) {
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return NULL;
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}
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fh = gfh->fh;
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buf = g_base64_decode(buf_b64, &buf_len);
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if (!has_count) {
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count = buf_len;
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} else if (count < 0 || count > buf_len) {
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error_setg(errp, "value '%" PRId64
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"' is invalid for argument count", count);
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goto done;
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}
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is_ok = WriteFile(fh, buf, count, &write_count, NULL);
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if (!is_ok) {
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error_setg_win32(errp, GetLastError(), "failed to write to file");
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slog("guest-file-write-failed, handle: %" PRId64, handle);
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} else {
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write_data = g_malloc0(sizeof(GuestFileWrite));
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write_data->count = (size_t) write_count;
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}
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done:
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g_free(buf);
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return write_data;
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}
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GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
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int64_t whence, Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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return 0;
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GuestFileHandle *gfh;
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GuestFileSeek *seek_data;
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HANDLE fh;
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LARGE_INTEGER new_pos, off_pos;
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off_pos.QuadPart = offset;
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BOOL res;
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gfh = guest_file_handle_find(handle, errp);
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if (!gfh) {
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return NULL;
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}
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fh = gfh->fh;
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res = SetFilePointerEx(fh, off_pos, &new_pos, whence);
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if (!res) {
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error_setg_win32(errp, GetLastError(), "failed to seek file");
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return NULL;
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}
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seek_data = g_new0(GuestFileSeek, 1);
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seek_data->position = new_pos.QuadPart;
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return seek_data;
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}
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void qmp_guest_file_flush(int64_t handle, Error **errp)
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{
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error_set(errp, QERR_UNSUPPORTED);
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HANDLE fh;
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GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
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if (!gfh) {
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return;
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}
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fh = gfh->fh;
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if (!FlushFileBuffers(fh)) {
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error_setg_win32(errp, GetLastError(), "failed to flush file");
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}
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}
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static void guest_file_init(void)
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{
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QTAILQ_INIT(&guest_file_state.filehandles);
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}
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GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
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@ -458,8 +688,6 @@ void qmp_guest_set_user_password(const char *username,
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GList *ga_command_blacklist_init(GList *blacklist)
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{
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const char *list_unsupported[] = {
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"guest-file-open", "guest-file-close", "guest-file-read",
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"guest-file-write", "guest-file-seek", "guest-file-flush",
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"guest-suspend-hybrid", "guest-network-get-interfaces",
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"guest-get-vcpus", "guest-set-vcpus",
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"guest-set-user-password",
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@ -491,4 +719,5 @@ void ga_command_state_init(GAState *s, GACommandState *cs)
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if (!vss_initialized()) {
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ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
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}
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ga_command_state_add(cs, guest_file_init, NULL);
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}
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