mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
3a92ee5953
Signed-off-by: Lukasz Marek <lukasz.m.luki@gmail.com>
722 lines
21 KiB
C
722 lines
21 KiB
C
/*
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* Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "avformat.h"
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#include "internal.h"
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#include "url.h"
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#include "libavutil/opt.h"
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#include "libavutil/bprint.h"
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#define CONTROL_BUFFER_SIZE 1024
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#define CREDENTIALS_BUFFER_SIZE 128
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typedef enum {
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UNKNOWN,
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READY,
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DOWNLOADING,
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UPLOADING,
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DISCONNECTED
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} FTPState;
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typedef struct {
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const AVClass *class;
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URLContext *conn_control; /**< Control connection */
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URLContext *conn_data; /**< Data connection, NULL when not connected */
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uint8_t control_buffer[CONTROL_BUFFER_SIZE]; /**< Control connection buffer */
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uint8_t *control_buf_ptr, *control_buf_end;
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int server_data_port; /**< Data connection port opened by server, -1 on error. */
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int server_control_port; /**< Control connection port, default is 21 */
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char hostname[512]; /**< Server address. */
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char credencials[CREDENTIALS_BUFFER_SIZE]; /**< Authentication data */
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char path[MAX_URL_SIZE]; /**< Path to resource on server. */
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int64_t filesize; /**< Size of file on server, -1 on error. */
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int64_t position; /**< Current position, calculated. */
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int rw_timeout; /**< Network timeout. */
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const char *anonymous_password; /**< Password to be used for anonymous user. An email should be used. */
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int write_seekable; /**< Control seekability, 0 = disable, 1 = enable. */
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FTPState state; /**< State of data connection */
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} FTPContext;
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#define OFFSET(x) offsetof(FTPContext, x)
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#define D AV_OPT_FLAG_DECODING_PARAM
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#define E AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
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{"ftp-write-seekable", "control seekability of connection during encoding", OFFSET(write_seekable), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
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{"ftp-anonymous-password", "password for anonymous login. E-mail address should be used.", OFFSET(anonymous_password), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
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{NULL}
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};
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static const AVClass ftp_context_class = {
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.class_name = "ftp",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static int ftp_getc(FTPContext *s)
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{
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int len;
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if (s->control_buf_ptr >= s->control_buf_end) {
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len = ffurl_read(s->conn_control, s->control_buffer, CONTROL_BUFFER_SIZE);
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if (len < 0) {
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return len;
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} else if (!len) {
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return -1;
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} else {
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s->control_buf_ptr = s->control_buffer;
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s->control_buf_end = s->control_buffer + len;
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}
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}
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return *s->control_buf_ptr++;
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}
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static int ftp_get_line(FTPContext *s, char *line, int line_size)
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{
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int ch;
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char *q = line;
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for (;;) {
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ch = ftp_getc(s);
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if (ch < 0) {
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return ch;
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}
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if (ch == '\n') {
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/* process line */
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if (q > line && q[-1] == '\r')
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q--;
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*q = '\0';
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return 0;
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} else {
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if ((q - line) < line_size - 1)
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*q++ = ch;
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}
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}
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}
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/*
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* This routine returns ftp server response code.
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* Server may send more than one response for a certain command.
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* First expected code is returned.
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*/
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static int ftp_status(FTPContext *s, char **line, const int response_codes[])
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{
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int err, i, dash = 0, result = 0, code_found = 0;
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char buf[CONTROL_BUFFER_SIZE];
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AVBPrint line_buffer;
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if (line)
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av_bprint_init(&line_buffer, 0, AV_BPRINT_SIZE_AUTOMATIC);
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while (!code_found || dash) {
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if ((err = ftp_get_line(s, buf, sizeof(buf))) < 0) {
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if (line)
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av_bprint_finalize(&line_buffer, NULL);
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return err;
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}
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av_log(s, AV_LOG_DEBUG, "%s\n", buf);
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if (strlen(buf) < 4)
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continue;
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err = 0;
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for (i = 0; i < 3; ++i) {
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if (buf[i] < '0' || buf[i] > '9')
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continue;
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err *= 10;
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err += buf[i] - '0';
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}
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dash = !!(buf[3] == '-');
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for (i = 0; response_codes[i]; ++i) {
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if (err == response_codes[i]) {
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if (line)
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av_bprintf(&line_buffer, "%s", buf);
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code_found = 1;
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result = err;
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break;
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}
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}
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}
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if (line)
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av_bprint_finalize(&line_buffer, line);
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return result;
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}
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static int ftp_send_command(FTPContext *s, const char *command,
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const int response_codes[], char **response)
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{
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int err;
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if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
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return err;
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if (!err)
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return -1;
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/* return status */
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if (response_codes) {
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return ftp_status(s, response, response_codes);
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}
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return 0;
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}
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static void ftp_close_data_connection(FTPContext *s)
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{
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ffurl_closep(&s->conn_data);
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s->position = 0;
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s->state = DISCONNECTED;
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}
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static void ftp_close_both_connections(FTPContext *s)
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{
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ffurl_closep(&s->conn_control);
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ftp_close_data_connection(s);
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}
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static int ftp_auth(FTPContext *s)
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{
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const char *user = NULL, *pass = NULL;
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char *end = NULL, buf[CONTROL_BUFFER_SIZE], credencials[CREDENTIALS_BUFFER_SIZE];
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int err;
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static const int user_codes[] = {331, 230, 500, 530, 0}; /* 500, 530 are incorrect codes */
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static const int pass_codes[] = {230, 503, 530, 0}; /* 503, 530 are incorrect codes */
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/* Authentication may be repeated, original string has to be saved */
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av_strlcpy(credencials, s->credencials, sizeof(credencials));
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user = av_strtok(credencials, ":", &end);
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pass = av_strtok(end, ":", &end);
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if (!user) {
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user = "anonymous";
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pass = s->anonymous_password ? s->anonymous_password : "nopassword";
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}
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snprintf(buf, sizeof(buf), "USER %s\r\n", user);
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err = ftp_send_command(s, buf, user_codes, NULL);
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if (err == 331) {
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if (pass) {
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snprintf(buf, sizeof(buf), "PASS %s\r\n", pass);
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err = ftp_send_command(s, buf, pass_codes, NULL);
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} else
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return AVERROR(EACCES);
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}
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if (err != 230)
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return AVERROR(EACCES);
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return 0;
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}
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static int ftp_passive_mode(FTPContext *s)
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{
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char *res = NULL, *start = NULL, *end = NULL;
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int i;
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static const char *command = "PASV\r\n";
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static const int pasv_codes[] = {227, 501, 0}; /* 501 is incorrect code */
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if (ftp_send_command(s, command, pasv_codes, &res) != 227 || !res)
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goto fail;
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for (i = 0; res[i]; ++i) {
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if (res[i] == '(') {
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start = res + i + 1;
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} else if (res[i] == ')') {
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end = res + i;
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break;
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}
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}
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if (!start || !end)
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goto fail;
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*end = '\0';
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/* skip ip */
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if (!av_strtok(start, ",", &end)) goto fail;
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if (!av_strtok(end, ",", &end)) goto fail;
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if (!av_strtok(end, ",", &end)) goto fail;
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if (!av_strtok(end, ",", &end)) goto fail;
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/* parse port number */
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start = av_strtok(end, ",", &end);
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if (!start) goto fail;
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s->server_data_port = atoi(start) * 256;
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start = av_strtok(end, ",", &end);
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if (!start) goto fail;
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s->server_data_port += atoi(start);
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av_dlog(s, "Server data port: %d\n", s->server_data_port);
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av_free(res);
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return 0;
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fail:
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av_free(res);
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s->server_data_port = -1;
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av_log(s, AV_LOG_ERROR, "Set passive mode failed\n"
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"Your FTP server may use IPv6 which is not supported yet.\n");
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return AVERROR(EIO);
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}
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static int ftp_current_dir(FTPContext *s)
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{
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char *res = NULL, *start = NULL, *end = NULL;
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int i;
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static const char *command = "PWD\r\n";
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static const int pwd_codes[] = {257, 0};
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if (ftp_send_command(s, command, pwd_codes, &res) != 257 || !res)
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goto fail;
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for (i = 0; res[i]; ++i) {
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if (res[i] == '"') {
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if (!start) {
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start = res + i + 1;
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continue;
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}
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end = res + i;
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break;
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}
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}
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if (!end)
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goto fail;
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if (end > res && end[-1] == '/') {
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end[-1] = '\0';
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} else
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*end = '\0';
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av_strlcpy(s->path, start, sizeof(s->path));
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av_free(res);
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return 0;
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fail:
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av_free(res);
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return AVERROR(EIO);
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}
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static int ftp_file_size(FTPContext *s)
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{
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char command[CONTROL_BUFFER_SIZE];
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char *res = NULL;
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static const int size_codes[] = {213, 501, 550, 0}; /* 501, 550 are incorrect codes */
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snprintf(command, sizeof(command), "SIZE %s\r\n", s->path);
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if (ftp_send_command(s, command, size_codes, &res) == 213 && res) {
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s->filesize = strtoll(&res[4], NULL, 10);
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} else {
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s->filesize = -1;
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av_free(res);
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return AVERROR(EIO);
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}
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av_free(res);
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return 0;
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}
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static int ftp_retrieve(FTPContext *s)
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{
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char command[CONTROL_BUFFER_SIZE];
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static const int retr_codes[] = {150, 550, 554, 0}; /* 550, 554 are incorrect codes */
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snprintf(command, sizeof(command), "RETR %s\r\n", s->path);
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if (ftp_send_command(s, command, retr_codes, NULL) != 150)
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return AVERROR(EIO);
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s->state = DOWNLOADING;
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return 0;
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}
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static int ftp_store(FTPContext *s)
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{
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char command[CONTROL_BUFFER_SIZE];
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static const int stor_codes[] = {150, 0};
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snprintf(command, sizeof(command), "STOR %s\r\n", s->path);
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if (ftp_send_command(s, command, stor_codes, NULL) != 150)
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return AVERROR(EIO);
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s->state = UPLOADING;
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return 0;
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}
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static int ftp_type(FTPContext *s)
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{
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static const char *command = "TYPE I\r\n";
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static const int type_codes[] = {200, 500, 504, 0}; /* 500, 504 are incorrect codes */
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if (ftp_send_command(s, command, type_codes, NULL) != 200)
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return AVERROR(EIO);
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return 0;
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}
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static int ftp_restart(FTPContext *s, int64_t pos)
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{
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char command[CONTROL_BUFFER_SIZE];
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static const int rest_codes[] = {350, 500, 501, 0}; /* 500, 501 are incorrect codes */
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snprintf(command, sizeof(command), "REST %"PRId64"\r\n", pos);
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if (ftp_send_command(s, command, rest_codes, NULL) != 350)
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return AVERROR(EIO);
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return 0;
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}
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static int ftp_connect_control_connection(URLContext *h)
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{
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char buf[CONTROL_BUFFER_SIZE], opts_format[20], *response = NULL;
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int err;
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AVDictionary *opts = NULL;
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FTPContext *s = h->priv_data;
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static const int connect_codes[] = {220, 0};
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if (!s->conn_control) {
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ff_url_join(buf, sizeof(buf), "tcp", NULL,
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s->hostname, s->server_control_port, NULL);
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if (s->rw_timeout != -1) {
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snprintf(opts_format, sizeof(opts_format), "%d", s->rw_timeout);
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av_dict_set(&opts, "timeout", opts_format, 0);
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} /* if option is not given, don't pass it and let tcp use its own default */
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err = ffurl_open(&s->conn_control, buf, AVIO_FLAG_READ_WRITE,
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&h->interrupt_callback, &opts);
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av_dict_free(&opts);
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if (err < 0) {
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av_log(h, AV_LOG_ERROR, "Cannot open control connection\n");
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return err;
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}
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/* check if server is ready */
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if (ftp_status(s, ((h->flags & AVIO_FLAG_WRITE) ? &response : NULL), connect_codes) != 220) {
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av_log(h, AV_LOG_ERROR, "FTP server not ready for new users\n");
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return AVERROR(EACCES);
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}
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if ((h->flags & AVIO_FLAG_WRITE) && av_stristr(response, "pure-ftpd")) {
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av_log(h, AV_LOG_WARNING, "Pure-FTPd server is used as an output protocol. It is known issue this implementation may produce incorrect content and it cannot be fixed at this moment.");
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}
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av_free(response);
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if ((err = ftp_auth(s)) < 0) {
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av_log(h, AV_LOG_ERROR, "FTP authentication failed\n");
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return err;
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}
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if ((err = ftp_type(s)) < 0) {
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av_log(h, AV_LOG_ERROR, "Set content type failed\n");
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return err;
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}
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}
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return 0;
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}
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static int ftp_connect_data_connection(URLContext *h)
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{
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int err;
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char buf[CONTROL_BUFFER_SIZE], opts_format[20];
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AVDictionary *opts = NULL;
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FTPContext *s = h->priv_data;
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if (!s->conn_data) {
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/* Enter passive mode */
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if ((err = ftp_passive_mode(s)) < 0)
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return err;
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/* Open data connection */
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ff_url_join(buf, sizeof(buf), "tcp", NULL, s->hostname, s->server_data_port, NULL);
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if (s->rw_timeout != -1) {
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snprintf(opts_format, sizeof(opts_format), "%d", s->rw_timeout);
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av_dict_set(&opts, "timeout", opts_format, 0);
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} /* if option is not given, don't pass it and let tcp use its own default */
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err = ffurl_open(&s->conn_data, buf, h->flags,
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&h->interrupt_callback, &opts);
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av_dict_free(&opts);
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if (err < 0)
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return err;
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if (s->position)
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if ((err = ftp_restart(s, s->position)) < 0)
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return err;
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}
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s->state = READY;
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return 0;
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}
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static int ftp_abort(URLContext *h)
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{
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static const char *command = "ABOR\r\n";
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int err;
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static const int abor_codes[] = {225, 226, 0};
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FTPContext *s = h->priv_data;
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/* According to RCF 959:
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"ABOR command tells the server to abort the previous FTP
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service command and any associated transfer of data."
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There are FTP server implementations that don't response
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to any commands during data transfer in passive mode (including ABOR).
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This implementation closes data connection by force.
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*/
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if (ftp_send_command(s, command, NULL, NULL) < 0) {
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ftp_close_both_connections(s);
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if ((err = ftp_connect_control_connection(h)) < 0) {
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av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
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return err;
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}
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} else {
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ftp_close_data_connection(s);
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if (ftp_status(s, NULL, abor_codes) < 225) {
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/* wu-ftpd also closes control connection after data connection closing */
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ffurl_closep(&s->conn_control);
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if ((err = ftp_connect_control_connection(h)) < 0) {
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av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
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return err;
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}
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}
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}
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return 0;
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}
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static int ftp_open(URLContext *h, const char *url, int flags)
|
|
{
|
|
char proto[10], path[MAX_URL_SIZE];
|
|
int err;
|
|
FTPContext *s = h->priv_data;
|
|
|
|
av_dlog(h, "ftp protocol open\n");
|
|
|
|
s->state = DISCONNECTED;
|
|
s->filesize = -1;
|
|
s->position = 0;
|
|
|
|
av_url_split(proto, sizeof(proto),
|
|
s->credencials, sizeof(s->credencials),
|
|
s->hostname, sizeof(s->hostname),
|
|
&s->server_control_port,
|
|
path, sizeof(path),
|
|
url);
|
|
|
|
if (s->server_control_port < 0 || s->server_control_port > 65535)
|
|
s->server_control_port = 21;
|
|
|
|
if ((err = ftp_connect_control_connection(h)) < 0)
|
|
goto fail;
|
|
|
|
if ((err = ftp_current_dir(s)) < 0)
|
|
goto fail;
|
|
av_strlcat(s->path, path, sizeof(s->path));
|
|
|
|
if (ftp_restart(s, 0) < 0) {
|
|
h->is_streamed = 1;
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
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 int64_t ftp_seek(URLContext *h, int64_t pos, int whence)
|
|
{
|
|
FTPContext *s = h->priv_data;
|
|
int err;
|
|
int64_t new_pos, fake_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);
|
|
|
|
/* XXX: Simulate behaviour of lseek in file protocol, which could be treated as a reference */
|
|
new_pos = FFMAX(0, new_pos);
|
|
fake_pos = s->filesize != -1 ? FFMIN(new_pos, s->filesize) : new_pos;
|
|
|
|
if (fake_pos != s->position) {
|
|
if ((err = ftp_abort(h)) < 0)
|
|
return err;
|
|
s->position = fake_pos;
|
|
}
|
|
return new_pos;
|
|
}
|
|
|
|
static int ftp_read(URLContext *h, unsigned char *buf, int size)
|
|
{
|
|
FTPContext *s = h->priv_data;
|
|
int read, err, retry_done = 0;
|
|
|
|
av_dlog(h, "ftp protocol read %d bytes\n", size);
|
|
retry:
|
|
if (s->state == DISCONNECTED) {
|
|
/* optimization */
|
|
if (s->position >= s->filesize)
|
|
return 0;
|
|
if ((err = ftp_connect_data_connection(h)) < 0)
|
|
return err;
|
|
}
|
|
if (s->state == READY) {
|
|
if (s->position >= s->filesize)
|
|
return 0;
|
|
if ((err = ftp_retrieve(s)) < 0)
|
|
return err;
|
|
}
|
|
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) {
|
|
/* server will terminate, but keep current position to avoid madness */
|
|
/* save position to restart from it */
|
|
int64_t pos = s->position;
|
|
if (ftp_abort(h) < 0) {
|
|
s->position = pos;
|
|
return AVERROR(EIO);
|
|
}
|
|
s->position = pos;
|
|
}
|
|
}
|
|
if (read <= 0 && s->position < s->filesize && !h->is_streamed) {
|
|
/* Server closed connection. Probably due to inactivity */
|
|
int64_t pos = s->position;
|
|
av_log(h, AV_LOG_INFO, "Reconnect to FTP server.\n");
|
|
if ((err = ftp_abort(h)) < 0)
|
|
return err;
|
|
if ((err = ftp_seek(h, pos, SEEK_SET)) < 0) {
|
|
av_log(h, AV_LOG_ERROR, "Position cannot be restored.\n");
|
|
return err;
|
|
}
|
|
if (!retry_done) {
|
|
retry_done = 1;
|
|
goto retry;
|
|
}
|
|
}
|
|
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)
|
|
{
|
|
int err;
|
|
FTPContext *s = h->priv_data;
|
|
int written;
|
|
|
|
av_dlog(h, "ftp protocol write %d bytes\n", size);
|
|
|
|
if (s->state == DISCONNECTED) {
|
|
if ((err = ftp_connect_data_connection(h)) < 0)
|
|
return err;
|
|
}
|
|
if (s->state == READY) {
|
|
if ((err = ftp_store(s)) < 0)
|
|
return err;
|
|
}
|
|
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 int ftp_close(URLContext *h)
|
|
{
|
|
av_dlog(h, "ftp protocol close\n");
|
|
|
|
ftp_close_both_connections(h->priv_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,
|
|
};
|