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ffmpeg/libavformat/ftp.c

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/*
* Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include "libavutil/avstring.h"
#include "libavutil/avassert.h"
#include "avformat.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"
#include "libavutil/opt.h"
#define CONTROL_BUFFER_SIZE 1024
typedef enum {
UNKNOWN,
READY,
DOWNLOADING,
UPLOADING,
DISCONNECTED
} FTPState;
typedef struct {
const AVClass *class;
URLContext *conn_control; /**< Control connection */
int conn_control_block_flag; /**< Controls block/unblock mode of data connection */
AVIOInterruptCB conn_control_interrupt_cb; /**< Controls block/unblock mode of data connection */
URLContext *conn_data; /**< Data connection, NULL when not connected */
uint8_t control_buffer[CONTROL_BUFFER_SIZE], *control_buf_ptr, *control_buf_end; /**< Control connection buffer */
int server_data_port; /**< Data connection port opened by server, -1 on error. */
char hostname[512]; /**< Server address. */
char path[MAX_URL_SIZE]; /**< Path to resource on server. */
int64_t filesize; /**< Size of file on server, -1 on error. */
int64_t position; /**< Current position, calculated. */
int rw_timeout; /**< Network timeout. */
const char *anonymous_password; /**< Password to be used for anonymous user. An email should be used. */
int write_seekable; /**< Control seekability, 0 = disable, 1 = enable. */
FTPState state; /**< State of data connection */
} FTPContext;
#define OFFSET(x) offsetof(FTPContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
{"ftp-write-seekable", "control seekability of connection during encoding", OFFSET(write_seekable), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
{"ftp-anonymous-password", "password for anonynous login. E-mail address should be used.", OFFSET(anonymous_password), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
{NULL}
};
static const AVClass ftp_context_class = {
.class_name = "ftp",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static int ftp_conn_control_block_control(void *data)
{
FTPContext *s = data;
return s->conn_control_block_flag;
}
static int ftp_getc(FTPContext *s)
{
int len;
if (s->control_buf_ptr >= s->control_buf_end) {
if (s->conn_control_block_flag)
return AVERROR_EXIT;
len = ffurl_read(s->conn_control, s->control_buffer, CONTROL_BUFFER_SIZE);
if (len < 0) {
return len;
} else if (!len) {
return -1;
} else {
s->control_buf_ptr = s->control_buffer;
s->control_buf_end = s->control_buffer + len;
}
}
return *s->control_buf_ptr++;
}
static int ftp_get_line(FTPContext *s, char *line, int line_size)
{
int ch;
char *q = line;
int ori_block_flag = s->conn_control_block_flag;
for (;;) {
ch = ftp_getc(s);
if (ch < 0) {
s->conn_control_block_flag = ori_block_flag;
return ch;
}
if (ch == '\n') {
/* process line */
if (q > line && q[-1] == '\r')
q--;
*q = '\0';
s->conn_control_block_flag = ori_block_flag;
return 0;
} else {
s->conn_control_block_flag = 0; /* line need to be finished */
if ((q - line) < line_size - 1)
*q++ = ch;
}
}
}
/*
* This routine returns ftp server response code.
* Server may send more than one response for a certain command, following priorites are used:
* - 5xx code is returned if occurred. (means error)
* - When pref_code is set then pref_code is return if occurred. (expected result)
* - The lowest code is returned. (means success)
*/
static int ftp_status(FTPContext *s, int *major, int *minor, int *extra, char **line, int pref_code)
{
int err, result = -1, pref_code_found = 0;
char buf[CONTROL_BUFFER_SIZE];
unsigned char d_major, d_minor, d_extra;
/* Set blocking mode */
s->conn_control_block_flag = 0;
for (;;) {
if ((err = ftp_get_line(s, buf, CONTROL_BUFFER_SIZE)) < 0) {
if (err == AVERROR_EXIT)
return result;
return err;
}
if (strlen(buf) < 3)
continue;
d_major = buf[0];
if (d_major < '1' || d_major > '6' || d_major == '4')
continue;
d_minor = buf[1];
if (d_minor < '0' || d_minor > '9')
continue;
d_extra = buf[2];
if (d_extra < '0' || d_extra > '9')
continue;
av_log(s, AV_LOG_DEBUG, "%s\n", buf);
err = d_major * 100 + d_minor * 10 + d_extra - 111 * '0';
if ((result < 0 || err < result || pref_code == err) && !pref_code_found || d_major == '5') {
if (pref_code == err || d_major == '5')
pref_code_found = 1;
result = err;
if (major)
*major = d_major - '0';
if (minor)
*minor = d_minor - '0';
if (extra)
*extra = d_extra - '0';
if (line)
*line = av_strdup(buf);
}
/* first code received. Now get all lines in non blocking mode */
if (pref_code < 0 || pref_code_found)
s->conn_control_block_flag = 1;
}
return result;
}
static int ftp_auth(FTPContext *s, char *auth)
{
const char *user = NULL, *pass = NULL;
char *end = NULL, buf[CONTROL_BUFFER_SIZE];
int err;
av_assert2(auth);
user = av_strtok(auth, ":", &end);
pass = av_strtok(end, ":", &end);
if (user) {
snprintf(buf, sizeof(buf), "USER %s\r\n", user);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
ftp_status(s, &err, NULL, NULL, NULL, -1);
if (err == 3) {
if (pass) {
snprintf(buf, sizeof(buf), "PASS %s\r\n", pass);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
ftp_status(s, &err, NULL, NULL, NULL, -1);
} else
return AVERROR(EACCES);
}
if (err != 2) {
return AVERROR(EACCES);
}
} else {
const char* command = "USER anonymous\r\n";
if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
return err;
ftp_status(s, &err, NULL, NULL, NULL, -1);
if (err == 3) {
if (s->anonymous_password) {
snprintf(buf, sizeof(buf), "PASS %s\r\n", s->anonymous_password);
} else
snprintf(buf, sizeof(buf), "PASS nopassword\r\n");
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
ftp_status(s, &err, NULL, NULL, NULL, -1);
}
if (err != 2) {
return AVERROR(EACCES);
}
}
return 0;
}
static int ftp_passive_mode(FTPContext *s)
{
char *res = NULL, *start, *end;
int err, i;
const char *command = "PASV\r\n";
if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, &res, 227) != 227)
goto fail;
start = NULL;
for (i = 0; i < strlen(res); ++i) {
if (res[i] == '(') {
start = res + i + 1;
} else if (res[i] == ')') {
end = res + i;
break;
}
}
if (!start || !end)
goto fail;
*end = '\0';
/* skip ip */
if (!av_strtok(start, ",", &end)) goto fail;
if (!av_strtok(end, ",", &end)) goto fail;
if (!av_strtok(end, ",", &end)) goto fail;
if (!av_strtok(end, ",", &end)) goto fail;
/* parse port number */
start = av_strtok(end, ",", &end);
if (!start) goto fail;
s->server_data_port = atoi(start) * 256;
start = av_strtok(end, ",", &end);
if (!start) goto fail;
s->server_data_port += atoi(start);
av_dlog(s, "Server data port: %d\n", s->server_data_port);
av_free(res);
return 0;
fail:
av_free(res);
s->server_data_port = -1;
return AVERROR(EIO);
}
static int ftp_current_dir(FTPContext *s)
{
char *res = NULL, *start = NULL, *end = NULL;
int err, i;
const char *command = "PWD\r\n";
if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, &res, 257) != 257)
goto fail;
for (i = 0; res[i]; ++i) {
if (res[i] == '"') {
if (!start) {
start = res + i + 1;
continue;
}
end = res + i;
break;
}
}
if (!end)
goto fail;
if (end > res && end[-1] == '/') {
end[-1] = '\0';
} else
*end = '\0';
av_strlcpy(s->path, start, sizeof(s->path));
av_free(res);
return 0;
fail:
av_free(res);
return AVERROR(EIO);
}
static int ftp_file_size(FTPContext *s)
{
char buf[CONTROL_BUFFER_SIZE];
int err;
char *res = NULL;
snprintf(buf, sizeof(buf), "SIZE %s\r\n", s->path);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, &res, 213) == 213) {
s->filesize = strtoll(&res[4], NULL, 10);
} else {
s->filesize = -1;
av_free(res);
return AVERROR(EIO);
}
av_free(res);
return 0;
}
static int ftp_retrieve(FTPContext *s)
{
char buf[CONTROL_BUFFER_SIZE];
int err;
snprintf(buf, sizeof(buf), "RETR %s\r\n", s->path);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, NULL, 150) != 150)
return AVERROR(EIO);
s->state = DOWNLOADING;
return 0;
}
static int ftp_store(FTPContext *s)
{
char buf[CONTROL_BUFFER_SIZE];
int err;
snprintf(buf, sizeof(buf), "STOR %s\r\n", s->path);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, NULL, 150) != 150)
return AVERROR(EIO);
s->state = UPLOADING;
return 0;
}
static int ftp_send_command(FTPContext *s, const char* command)
{
int err;
if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
return err;
ftp_status(s, &err, NULL, NULL, NULL, -1);
if (err != 2)
return AVERROR(EIO);
return 0;
}
static int ftp_reconnect_data_connection(URLContext *h)
{
int err;
char buf[CONTROL_BUFFER_SIZE], opts_format[20];
AVDictionary *opts = NULL;
FTPContext *s = h->priv_data;
if (!s->conn_data) {
ff_url_join(buf, sizeof(buf), "tcp", NULL, s->hostname, s->server_data_port, NULL);
if (s->rw_timeout != -1) {
snprintf(opts_format, sizeof(opts_format), "%d", s->rw_timeout);
av_dict_set(&opts, "timeout", opts_format, 0);
} /* if option is not given, don't pass it and let tcp use its own default */
err = ffurl_open(&s->conn_data, buf, AVIO_FLAG_READ_WRITE,
&h->interrupt_callback, &opts);
av_dict_free(&opts);
if (err < 0)
return err;
}
s->state = READY;
s->position = 0;
return 0;
}
static int ftp_open(URLContext *h, const char *url, int flags)
{
char proto[10], auth[1024], path[MAX_URL_SIZE], buf[CONTROL_BUFFER_SIZE], opts_format[20];
AVDictionary *opts = NULL;
int port, err;
FTPContext *s = h->priv_data;
av_dlog(h, "ftp protocol open\n");
s->state = DISCONNECTED;
s->filesize = -1;
s->conn_control_interrupt_cb.opaque = s;
s->conn_control_interrupt_cb.callback = ftp_conn_control_block_control;
av_url_split(proto, sizeof(proto),
auth, sizeof(auth),
s->hostname, sizeof(s->hostname),
&port,
path, sizeof(path),
url);
if (port < 0)
port = 21;
if (!s->conn_control) {
ff_url_join(buf, sizeof(buf), "tcp", NULL, s->hostname, port, NULL);
if (s->rw_timeout != -1) {
snprintf(opts_format, sizeof(opts_format), "%d", s->rw_timeout);
av_dict_set(&opts, "timeout", opts_format, 0);
} /* if option is not given, don't pass it and let tcp use its own default */
err = ffurl_open(&s->conn_control, buf, AVIO_FLAG_READ_WRITE,
&s->conn_control_interrupt_cb, &opts);
av_dict_free(&opts);
if (err < 0)
goto fail;
/* consume all messages from server */
if (ftp_status(s, NULL, NULL, NULL, NULL, 220) != 220) {
av_log(h, AV_LOG_ERROR, "Server not ready for new users\n");
err = AVERROR(EACCES);
goto fail;
}
if ((err = ftp_auth(s, auth)) < 0)
goto fail;
if ((err = ftp_send_command(s, "TYPE I\r\n")) < 0)
goto fail;
if ((err = ftp_current_dir(s)) < 0)
goto fail;
av_strlcat(s->path, path, sizeof(s->path));
if ((err = ftp_passive_mode(s)) < 0)
goto fail;
if (ftp_file_size(s) < 0 && flags & AVIO_FLAG_READ)
h->is_streamed = 1;
if (s->write_seekable != 1 && flags & AVIO_FLAG_WRITE)
h->is_streamed = 1;
}
if ((err = ftp_reconnect_data_connection(h)) < 0)
goto fail;
return 0;
fail:
av_log(h, AV_LOG_ERROR, "FTP open failed\n");
ffurl_closep(&s->conn_control);
ffurl_closep(&s->conn_data);
return err;
}
static int ftp_read(URLContext *h, unsigned char *buf, int size)
{
FTPContext *s = h->priv_data;
int read;
av_dlog(h, "ftp protocol read %d bytes\n", size);
if (s->state == READY) {
ftp_retrieve(s);
}
if (s->conn_data && s->state == DOWNLOADING) {
read = ffurl_read(s->conn_data, buf, size);
if (read >= 0) {
s->position += read;
if (s->position >= s->filesize) {
ffurl_closep(&s->conn_data);
s->state = DISCONNECTED;
if (ftp_status(s, NULL, NULL, NULL,NULL, 226) != 226)
return AVERROR(EIO);
}
}
return read;
}
av_log(h, AV_LOG_DEBUG, "FTP read failed\n");
return AVERROR(EIO);
}
static int ftp_write(URLContext *h, const unsigned char *buf, int size)
{
FTPContext *s = h->priv_data;
int written;
av_dlog(h, "ftp protocol write %d bytes\n", size);
if (s->state == READY) {
ftp_store(s);
}
if (s->conn_data && s->state == UPLOADING) {
written = ffurl_write(s->conn_data, buf, size);
if (written > 0) {
s->position += written;
s->filesize = FFMAX(s->filesize, s->position);
}
return written;
}
av_log(h, AV_LOG_ERROR, "FTP write failed\n");
return AVERROR(EIO);
}
static int64_t ftp_seek(URLContext *h, int64_t pos, int whence)
{
FTPContext *s = h->priv_data;
char buf[CONTROL_BUFFER_SIZE];
int err;
int64_t new_pos;
av_dlog(h, "ftp protocol seek %"PRId64" %d\n", pos, whence);
switch(whence) {
case AVSEEK_SIZE:
return s->filesize;
case SEEK_SET:
new_pos = pos;
break;
case SEEK_CUR:
new_pos = s->position + pos;
break;
case SEEK_END:
if (s->filesize < 0)
return AVERROR(EIO);
new_pos = s->filesize + pos;
break;
default:
return AVERROR(EINVAL);
}
if (h->is_streamed)
return AVERROR(EIO);
if (new_pos < 0 || (s->filesize >= 0 && new_pos > s->filesize))
return AVERROR(EINVAL);
if (new_pos != s->position) {
/* close existing data connection */
if (s->state != READY) {
if (s->conn_data) {
/* abort existing transfer */
if (s->state == DOWNLOADING) {
snprintf(buf, sizeof(buf), "ABOR\r\n");
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
}
ffurl_closep(&s->conn_data);
s->state = DISCONNECTED;
/* Servers return 225 or 226 */
ftp_status(s, &err, NULL, NULL, NULL, -1);
if (err != 2)
return AVERROR(EIO);
}
/* set passive */
if ((err = ftp_passive_mode(s)) < 0)
return err;
/* open new data connection */
if ((err = ftp_reconnect_data_connection(h)) < 0)
return err;
}
/* resume from pos position */
snprintf(buf, sizeof(buf), "REST %"PRId64"\r\n", pos);
if ((err = ffurl_write(s->conn_control, buf, strlen(buf))) < 0)
return err;
if (ftp_status(s, NULL, NULL, NULL, NULL, 350) != 350)
return AVERROR(EIO);
s->position = pos;
}
return new_pos;
}
static int ftp_close(URLContext *h)
{
FTPContext *s = h->priv_data;
av_dlog(h, "ftp protocol close\n");
ffurl_closep(&s->conn_control);
ffurl_closep(&s->conn_data);
return 0;
}
static int ftp_get_file_handle(URLContext *h)
{
FTPContext *s = h->priv_data;
av_dlog(h, "ftp protocol get_file_handle\n");
if (s->conn_data)
return ffurl_get_file_handle(s->conn_data);
return AVERROR(EIO);
}
static int ftp_shutdown(URLContext *h, int flags)
{
FTPContext *s = h->priv_data;
av_dlog(h, "ftp protocol shutdown\n");
if (s->conn_data)
return ffurl_shutdown(s->conn_data, flags);
return AVERROR(EIO);
}
URLProtocol ff_ftp_protocol = {
.name = "ftp",
.url_open = ftp_open,
.url_read = ftp_read,
.url_write = ftp_write,
.url_seek = ftp_seek,
.url_close = ftp_close,
.url_get_file_handle = ftp_get_file_handle,
.url_shutdown = ftp_shutdown,
.priv_data_size = sizeof(FTPContext),
.priv_data_class = &ftp_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
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