1 files changed, 801 insertions, 0 deletions
diff --git a/libavformat/ftp.c b/libavformat/ftp.c
new file mode 100644
index 0000000000..7faf4a5d66
--- /dev/null
+++ b/libavformat/ftp.c
@@ -0,0 +1,801 @@
+/*
+ * 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 "libavutil/avstring.h"
+#include "avformat.h"
+#include "internal.h"
+#include "url.h"
+#include "libavutil/opt.h"
+#include "libavutil/bprint.h"
+
+#define CONTROL_BUFFER_SIZE 1024
+#define CREDENTIALS_BUFFER_SIZE 128
+
+typedef enum {
+    UNKNOWN,
+    READY,
+    DOWNLOADING,
+    UPLOADING,
+    DISCONNECTED
+} FTPState;
+
+typedef struct {
+    const AVClass *class;
+    URLContext *conn_control;                    /**< Control connection */
+    URLContext *conn_data;                       /**< Data connection, NULL when not connected */
+    uint8_t control_buffer[CONTROL_BUFFER_SIZE]; /**< Control connection buffer */
+    uint8_t *control_buf_ptr, *control_buf_end;
+    int server_data_port;                        /**< Data connection port opened by server, -1 on error. */
+    int server_control_port;                     /**< Control connection port, default is 21 */
+    char hostname[512];                          /**< Server address. */
+    char credencials[CREDENTIALS_BUFFER_SIZE];   /**< Authentication data */
+    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 anonymous 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_getc(FTPContext *s)
+{
+    int len;
+    if (s->control_buf_ptr >= s->control_buf_end) {
+        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;
+
+    for (;;) {
+        ch = ftp_getc(s);
+        if (ch < 0) {
+            return ch;
+        }
+        if (ch == '\n') {
+            /* process line */
+            if (q > line && q[-1] == '\r')
+                q--;
+            *q = '\0';
+            return 0;
+        } else {
+            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.
+ * First expected code is returned.
+ */
+static int ftp_status(FTPContext *s, char **line, const int response_codes[])
+{
+    int err, i, dash = 0, result = 0, code_found = 0, linesize;
+    char buf[CONTROL_BUFFER_SIZE];
+    AVBPrint line_buffer;
+
+    if (line)
+        av_bprint_init(&line_buffer, 0, AV_BPRINT_SIZE_AUTOMATIC);
+
+    while (!code_found || dash) {
+        if ((err = ftp_get_line(s, buf, sizeof(buf))) < 0) {
+            if (line)
+                av_bprint_finalize(&line_buffer, NULL);
+            return err;
+        }
+
+        av_log(s, AV_LOG_DEBUG, "%s\n", buf);
+
+        linesize = strlen(buf);
+        err = 0;
+        if (linesize >= 3) {
+            for (i = 0; i < 3; ++i) {
+                if (buf[i] < '0' || buf[i] > '9') {
+                    err = 0;
+                    break;
+                }
+                err *= 10;
+                err += buf[i] - '0';
+            }
+        }
+
+        if (!code_found) {
+            if (err >= 500) {
+                code_found = 1;
+                result = err;
+            } else
+                for (i = 0; response_codes[i]; ++i) {
+                    if (err == response_codes[i]) {
+                        code_found = 1;
+                        result = err;
+                        break;
+                    }
+                }
+        }
+        if (code_found) {
+            if (line)
+                av_bprintf(&line_buffer, "%s\r\n", buf);
+            if (linesize >= 4) {
+                if (!dash && buf[3] == '-')
+                    dash = err;
+                else if (err == dash && buf[3] == ' ')
+                    dash = 0;
+            }
+        }
+    }
+
+    if (line)
+        av_bprint_finalize(&line_buffer, line);
+    return result;
+}
+
+static int ftp_send_command(FTPContext *s, const char *command,
+                            const int response_codes[], char **response)
+{
+    int err;
+
+    if (response)
+        *response = NULL;
+
+    if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
+        return err;
+    if (!err)
+        return -1;
+
+    /* return status */
+    if (response_codes) {
+        return ftp_status(s, response, response_codes);
+    }
+    return 0;
+}
+
+static void ftp_close_data_connection(FTPContext *s)
+{
+    ffurl_closep(&s->conn_data);
+    s->position = 0;
+    s->state = DISCONNECTED;
+}
+
+static void ftp_close_both_connections(FTPContext *s)
+{
+    ffurl_closep(&s->conn_control);
+    ftp_close_data_connection(s);
+}
+
+static int ftp_auth(FTPContext *s)
+{
+    const char *user = NULL, *pass = NULL;
+    char *end = NULL, buf[CONTROL_BUFFER_SIZE], credencials[CREDENTIALS_BUFFER_SIZE];
+    int err;
+    static const int user_codes[] = {331, 230, 0};
+    static const int pass_codes[] = {230, 0};
+
+    /* Authentication may be repeated, original string has to be saved */
+    av_strlcpy(credencials, s->credencials, sizeof(credencials));
+
+    user = av_strtok(credencials, ":", &end);
+    pass = av_strtok(end, ":", &end);
+
+    if (!user) {
+        user = "anonymous";
+        pass = s->anonymous_password ? s->anonymous_password : "nopassword";
+    }
+
+    snprintf(buf, sizeof(buf), "USER %s\r\n", user);
+    err = ftp_send_command(s, buf, user_codes, NULL);
+    if (err == 331) {
+        if (pass) {
+            snprintf(buf, sizeof(buf), "PASS %s\r\n", pass);
+            err = ftp_send_command(s, buf, pass_codes, NULL);
+        } else
+            return AVERROR(EACCES);
+    }
+    if (err != 230)
+        return AVERROR(EACCES);
+
+    return 0;
+}
+
+static int ftp_passive_mode_epsv(FTPContext *s)
+{
+    char *res = NULL, *start = NULL, *end = NULL;
+    int i;
+    static const char d = '|';
+    static const char *command = "EPSV\r\n";
+    static const int epsv_codes[] = {229, 0};
+
+    if (ftp_send_command(s, command, epsv_codes, &res) != 229 || !res)
+        goto fail;
+
+    for (i = 0; res[i]; ++i) {
+        if (res[i] == '(') {
+            start = res + i + 1;
+        } else if (res[i] == ')') {
+            end = res + i;
+            break;
+        }
+    }
+    if (!start || !end)
+        goto fail;
+
+    *end = '\0';
+    if (strlen(start) < 5)
+        goto fail;
+    if (start[0] != d || start[1] != d || start[2] != d || end[-1] != d)
+        goto fail;
+    start += 3;
+    end[-1] = '\0';
+
+    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(ENOSYS);
+}
+
+static int ftp_passive_mode(FTPContext *s)
+{
+    char *res = NULL, *start = NULL, *end = NULL;
+    int i;
+    static const char *command = "PASV\r\n";
+    static const int pasv_codes[] = {227, 0};
+
+    if (ftp_send_command(s, command, pasv_codes, &res) != 227 || !res)
+        goto fail;
+
+    for (i = 0; res[i]; ++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 i;
+    static const char *command = "PWD\r\n";
+    static const int pwd_codes[] = {257, 0};
+
+    if (ftp_send_command(s, command, pwd_codes, &res) != 257 || !res)
+        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 command[CONTROL_BUFFER_SIZE];
+    char *res = NULL;
+    static const int size_codes[] = {213, 0};
+
+    snprintf(command, sizeof(command), "SIZE %s\r\n", s->path);
+    if (ftp_send_command(s, command, size_codes, &res) == 213 && res) {
+        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 command[CONTROL_BUFFER_SIZE];
+    static const int retr_codes[] = {150, 0};
+
+    snprintf(command, sizeof(command), "RETR %s\r\n", s->path);
+    if (ftp_send_command(s, command, retr_codes, NULL) != 150)
+        return AVERROR(EIO);
+
+    s->state = DOWNLOADING;
+
+    return 0;
+}
+
+static int ftp_store(FTPContext *s)
+{
+    char command[CONTROL_BUFFER_SIZE];
+    static const int stor_codes[] = {150, 0};
+
+    snprintf(command, sizeof(command), "STOR %s\r\n", s->path);
+    if (ftp_send_command(s, command, stor_codes, NULL) != 150)
+        return AVERROR(EIO);
+
+    s->state = UPLOADING;
+
+    return 0;
+}
+
+static int ftp_type(FTPContext *s)
+{
+    static const char *command = "TYPE I\r\n";
+    static const int type_codes[] = {200, 0};
+
+    if (ftp_send_command(s, command, type_codes, NULL) != 200)
+        return AVERROR(EIO);
+
+    return 0;
+}
+
+static int ftp_restart(FTPContext *s, int64_t pos)
+{
+    char command[CONTROL_BUFFER_SIZE];
+    static const int rest_codes[] = {350, 0};
+
+    snprintf(command, sizeof(command), "REST %"PRId64"\r\n", pos);
+    if (ftp_send_command(s, command, rest_codes, NULL) != 350)
+        return AVERROR(EIO);
+
+    return 0;
+}
+
+static int ftp_features(FTPContext *s)
+{
+    static const char *feat_command        = "FEAT\r\n";
+    static const char *enable_utf8_command = "OPTS UTF8 ON\r\n";
+    static const int feat_codes[] = {211, 0};
+    static const int opts_codes[] = {200, 451};
+    char *feat = NULL;
+
+    if (ftp_send_command(s, feat_command, feat_codes, &feat) == 211) {
+        if (av_stristr(feat, "UTF8"))
+            ftp_send_command(s, enable_utf8_command, opts_codes, NULL);
+    }
+    av_freep(&feat);
+
+    return 0;
+}
+
+static int ftp_connect_control_connection(URLContext *h)
+{
+    char buf[CONTROL_BUFFER_SIZE], *response = NULL;
+    int err;
+    AVDictionary *opts = NULL;
+    FTPContext *s = h->priv_data;
+    static const int connect_codes[] = {220, 0};
+
+    if (!s->conn_control) {
+        ff_url_join(buf, sizeof(buf), "tcp", NULL,
+                    s->hostname, s->server_control_port, NULL);
+        if (s->rw_timeout != -1) {
+            av_dict_set_int(&opts, "timeout", s->rw_timeout, 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,
+                         &h->interrupt_callback, &opts);
+        av_dict_free(&opts);
+        if (err < 0) {
+            av_log(h, AV_LOG_ERROR, "Cannot open control connection\n");
+            return err;
+        }
+
+        /* check if server is ready */
+        if (ftp_status(s, ((h->flags & AVIO_FLAG_WRITE) ? &response : NULL), connect_codes) != 220) {
+            av_log(h, AV_LOG_ERROR, "FTP server not ready for new users\n");
+            return AVERROR(EACCES);
+        }
+
+        if ((h->flags & AVIO_FLAG_WRITE) && av_stristr(response, "pure-ftpd")) {
+            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.");
+        }
+        av_free(response);
+
+        if ((err = ftp_auth(s)) < 0) {
+            av_log(h, AV_LOG_ERROR, "FTP authentication failed\n");
+            return err;
+        }
+
+        if ((err = ftp_type(s)) < 0) {
+            av_log(h, AV_LOG_ERROR, "Set content type failed\n");
+            return err;
+        }
+
+        ftp_features(s);
+    }
+    return 0;
+}
+
+static int ftp_connect_data_connection(URLContext *h)
+{
+    int err;
+    char buf[CONTROL_BUFFER_SIZE];
+    AVDictionary *opts = NULL;
+    FTPContext *s = h->priv_data;
+
+    if (!s->conn_data) {
+        /* Enter passive mode */
+        if (ftp_passive_mode_epsv(s) < 0) {
+            /* Use PASV as fallback */
+            if ((err = ftp_passive_mode(s)) < 0)
+                return err;
+        }
+        /* Open data connection */
+        ff_url_join(buf, sizeof(buf), "tcp", NULL, s->hostname, s->server_data_port, NULL);
+        if (s->rw_timeout != -1) {
+            av_dict_set_int(&opts, "timeout", s->rw_timeout, 0);
+        } /* if option is not given, don't pass it and let tcp use its own default */
+        err = ffurl_open(&s->conn_data, buf, h->flags,
+                         &h->interrupt_callback, &opts);
+        av_dict_free(&opts);
+        if (err < 0)
+            return err;
+
+        if (s->position)
+            if ((err = ftp_restart(s, s->position)) < 0)
+                return err;
+    }
+    s->state = READY;
+    return 0;
+}
+
+static int ftp_abort(URLContext *h)
+{
+    static const char *command = "ABOR\r\n";
+    int err;
+    static const int abor_codes[] = {225, 226, 0};
+    FTPContext *s = h->priv_data;
+
+    /* According to RCF 959:
+       "ABOR command tells the server to abort the previous FTP
+       service command and any associated transfer of data."
+
+       There are FTP server implementations that don't response
+       to any commands during data transfer in passive mode (including ABOR).
+
+       This implementation closes data connection by force.
+    */
+
+    if (ftp_send_command(s, command, NULL, NULL) < 0) {
+        ftp_close_both_connections(s);
+        if ((err = ftp_connect_control_connection(h)) < 0) {
+            av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
+            return err;
+        }
+    } else {
+        ftp_close_data_connection(s);
+        if (ftp_status(s, NULL, abor_codes) < 225) {
+            /* wu-ftpd also closes control connection after data connection closing */
+            ffurl_closep(&s->conn_control);
+            if ((err = ftp_connect_control_connection(h)) < 0) {
+                av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
+                return err;
+            }
+        }
+    }
+
+    return 0;
+}
+
+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);
+
+    if (new_pos < 0) {
+        av_log(h, AV_LOG_ERROR, "Seeking to nagative position.\n");
+        return AVERROR(EINVAL);
+    }
+
+    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,
+};