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mpv/stream/stream_file.c
Yclept Nemo 5532a3da1e stream_smb/stream_file: fix write_buffer 
Functions `write` and `smbc_write` are given a diminishing buffer of
incorrect constant size. After partial writes, the code would do another
write of the full original length, failing to subtract the amount
already written.
2018-07-29 12:54:56 +03:00

374 lines
10 KiB
C
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/*
* Original authors: Albeu, probably Arpi
*
* This file is part of mpv.
*
* mpv 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.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifndef __MINGW32__
#include <poll.h>
#endif
#include "osdep/io.h"
#include "common/common.h"
#include "common/msg.h"
#include "stream.h"
#include "options/m_option.h"
#include "options/path.h"
#if HAVE_BSD_FSTATFS
#include <sys/param.h>
#include <sys/mount.h>
#endif
#if HAVE_LINUX_FSTATFS
#include <sys/vfs.h>
#endif
#ifdef _WIN32
#include <windows.h>
#include <winternl.h>
#include <io.h>
#ifndef FILE_REMOTE_DEVICE
#define FILE_REMOTE_DEVICE (0x10)
#endif
#endif
struct priv {
int fd;
bool close;
bool use_poll;
bool regular_file;
bool appending;
int64_t orig_size;
};
// Total timeout = RETRY_TIMEOUT * MAX_RETRIES
#define RETRY_TIMEOUT 0.2
#define MAX_RETRIES 10
static int64_t get_size(stream_t *s)
{
struct priv *p = s->priv;
off_t size = lseek(p->fd, 0, SEEK_END);
lseek(p->fd, s->pos, SEEK_SET);
return size == (off_t)-1 ? -1 : size;
}
static int fill_buffer(stream_t *s, char *buffer, int max_len)
{
struct priv *p = s->priv;
#ifndef __MINGW32__
if (p->use_poll) {
int c = s->cancel ? mp_cancel_get_fd(s->cancel) : -1;
struct pollfd fds[2] = {
{.fd = p->fd, .events = POLLIN},
{.fd = c, .events = POLLIN},
};
poll(fds, c >= 0 ? 2 : 1, -1);
if (fds[1].revents & POLLIN)
return -1;
}
#endif
for (int retries = 0; retries < MAX_RETRIES; retries++) {
int r = read(p->fd, buffer, max_len);
if (r > 0)
return r;
// Try to detect and handle files being appended during playback.
int64_t size = get_size(s);
if (p->regular_file && size > p->orig_size && !p->appending) {
MP_WARN(s, "File is apparently being appended to, will keep "
"retrying with timeouts.\n");
p->appending = true;
}
if (!p->appending || p->use_poll)
break;
if (mp_cancel_wait(s->cancel, RETRY_TIMEOUT))
break;
}
return 0;
}
static int write_buffer(stream_t *s, char *buffer, int len)
{
struct priv *p = s->priv;
int r = len;
int wr;
while (r > 0) {
wr = write(p->fd, buffer, r);
if (wr <= 0)
return -1;
r -= wr;
buffer += wr;
}
return len - r;
}
static int seek(stream_t *s, int64_t newpos)
{
struct priv *p = s->priv;
return lseek(p->fd, newpos, SEEK_SET) != (off_t)-1;
}
static int control(stream_t *s, int cmd, void *arg)
{
switch (cmd) {
case STREAM_CTRL_GET_SIZE: {
int64_t size = get_size(s);
if (size >= 0) {
*(int64_t *)arg = size;
return 1;
}
break;
}
}
return STREAM_UNSUPPORTED;
}
static void s_close(stream_t *s)
{
struct priv *p = s->priv;
if (p->close)
close(p->fd);
}
// If url is a file:// URL, return the local filename, otherwise return NULL.
char *mp_file_url_to_filename(void *talloc_ctx, bstr url)
{
bstr proto = mp_split_proto(url, &url);
if (bstrcasecmp0(proto, "file") != 0)
return NULL;
char *filename = bstrto0(talloc_ctx, url);
mp_url_unescape_inplace(filename);
#if HAVE_DOS_PATHS
// extract '/' from '/x:/path'
if (filename[0] == '/' && filename[1] && filename[2] == ':')
memmove(filename, filename + 1, strlen(filename)); // including \0
#endif
return filename;
}
// Return talloc_strdup's filesystem path if local, otherwise NULL.
// Unlike mp_file_url_to_filename(), doesn't return NULL if already local.
char *mp_file_get_path(void *talloc_ctx, bstr url)
{
if (mp_split_proto(url, &(bstr){0}).len) {
return mp_file_url_to_filename(talloc_ctx, url);
} else {
return bstrto0(talloc_ctx, url);
}
}
#if HAVE_BSD_FSTATFS
static bool check_stream_network(int fd)
{
struct statfs fs;
const char *stypes[] = { "afpfs", "nfs", "smbfs", "webdav", "osxfusefs",
"fuse", "fusefs.sshfs", NULL };
if (fstatfs(fd, &fs) == 0)
for (int i=0; stypes[i]; i++)
if (strcmp(stypes[i], fs.f_fstypename) == 0)
return true;
return false;
}
#elif HAVE_LINUX_FSTATFS
static bool check_stream_network(int fd)
{
struct statfs fs;
const uint32_t stypes[] = {
0x5346414F /*AFS*/, 0x61756673 /*AUFS*/, 0x00C36400 /*CEPH*/,
0xFF534D42 /*CIFS*/, 0x73757245 /*CODA*/, 0x19830326 /*FHGFS*/,
0x65735546 /*FUSEBLK*/,0x65735543 /*FUSECTL*/,0x1161970 /*GFS*/,
0x47504653 /*GPFS*/, 0x6B414653 /*KAFS*/, 0x0BD00BD0 /*LUSTRE*/,
0x564C /*NCP*/, 0x6969 /*NFS*/, 0x6E667364 /*NFSD*/,
0xAAD7AAEA /*PANFS*/, 0x50495045 /*PIPEFS*/, 0x517B /*SMB*/,
0xBEEFDEAD /*SNFS*/, 0xBACBACBC /*VMHGFS*/, 0x7461636f /*OCFS2*/,
0xFE534D42 /*SMB2*/, 0x61636673 /*ACFS*/, 0x013111A8 /*IBRIX*/,
0
};
if (fstatfs(fd, &fs) == 0) {
for (int i=0; stypes[i]; i++) {
if (stypes[i] == fs.f_type)
return true;
}
}
return false;
}
#elif defined(_WIN32)
static bool check_stream_network(int fd)
{
NTSTATUS (NTAPI *pNtQueryVolumeInformationFile)(HANDLE,
PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS) = NULL;
// NtQueryVolumeInformationFile is an internal Windows function. It has
// been present since Windows XP, however this code should fail gracefully
// if it's removed from a future version of Windows.
HMODULE ntdll = GetModuleHandleW(L"ntdll.dll");
pNtQueryVolumeInformationFile = (NTSTATUS (NTAPI*)(HANDLE,
PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS))
GetProcAddress(ntdll, "NtQueryVolumeInformationFile");
if (!pNtQueryVolumeInformationFile)
return false;
HANDLE h = (HANDLE)_get_osfhandle(fd);
if (h == INVALID_HANDLE_VALUE)
return false;
FILE_FS_DEVICE_INFORMATION info = { 0 };
IO_STATUS_BLOCK io;
NTSTATUS status = pNtQueryVolumeInformationFile(h, &io, &info,
sizeof(info), FileFsDeviceInformation);
if (!NT_SUCCESS(status))
return false;
return info.DeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM ||
(info.Characteristics & FILE_REMOTE_DEVICE);
}
#else
static bool check_stream_network(int fd)
{
return false;
}
#endif
static int open_f(stream_t *stream)
{
struct priv *p = talloc_ptrtype(stream, p);
*p = (struct priv) {
.fd = -1
};
stream->priv = p;
stream->is_local_file = true;
bool write = stream->mode == STREAM_WRITE;
int m = O_CLOEXEC | (write ? O_RDWR | O_CREAT | O_TRUNC : O_RDONLY);
char *filename = mp_file_url_to_filename(stream, bstr0(stream->url));
if (filename) {
stream->path = filename;
} else {
filename = stream->path;
}
bool is_fdclose = strncmp(stream->url, "fdclose://", 10) == 0;
if (strncmp(stream->url, "fd://", 5) == 0 || is_fdclose) {
char *begin = strstr(stream->url, "://") + 3, *end = NULL;
p->fd = strtol(begin, &end, 0);
if (!end || end == begin || end[0]) {
MP_ERR(stream, "Invalid FD: %s\n", stream->url);
return STREAM_ERROR;
}
if (is_fdclose)
p->close = true;
} else if (!strcmp(filename, "-")) {
if (!write) {
MP_INFO(stream, "Reading from stdin...\n");
p->fd = 0;
} else {
MP_INFO(stream, "Writing to stdout...\n");
p->fd = 1;
}
} else {
if (bstr_startswith0(bstr0(stream->url), "appending://"))
p->appending = true;
mode_t openmode = S_IRUSR | S_IWUSR;
#ifndef __MINGW32__
openmode |= S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
if (!write)
m |= O_NONBLOCK;
#endif
p->fd = open(filename, m | O_BINARY, openmode);
if (p->fd < 0) {
MP_ERR(stream, "Cannot open file '%s': %s\n",
filename, mp_strerror(errno));
return STREAM_ERROR;
}
p->close = true;
}
struct stat st;
if (fstat(p->fd, &st) == 0) {
if (S_ISDIR(st.st_mode)) {
stream->is_directory = true;
stream->allow_caching = false;
MP_INFO(stream, "This is a directory - adding to playlist.\n");
} else if (S_ISREG(st.st_mode)) {
p->regular_file = true;
#ifndef __MINGW32__
// O_NONBLOCK has weird semantics on file locks; remove it.
int val = fcntl(p->fd, F_GETFL) & ~(unsigned)O_NONBLOCK;
fcntl(p->fd, F_SETFL, val);
#endif
} else {
p->use_poll = true;
}
}
#ifdef __MINGW32__
setmode(p->fd, O_BINARY);
#endif
off_t len = lseek(p->fd, 0, SEEK_END);
lseek(p->fd, 0, SEEK_SET);
if (len != (off_t)-1) {
stream->seek = seek;
stream->seekable = true;
}
stream->fast_skip = true;
stream->fill_buffer = fill_buffer;
stream->write_buffer = write_buffer;
stream->control = control;
stream->read_chunk = 64 * 1024;
stream->close = s_close;
if (check_stream_network(p->fd))
stream->streaming = true;
p->orig_size = get_size(stream);
return STREAM_OK;
}
const stream_info_t stream_info_file = {
.name = "file",
.open = open_f,
.protocols = (const char*const[]){ "file", "", "fd", "fdclose",
"appending", NULL },
.can_write = true,
.is_safe = true,
};
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