FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* FFmpeg is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include <string.h>
22			#include <time.h>
23
24			#include "libavutil/avstring.h"
25			#include "libavutil/internal.h"
26			#include "libavutil/mem.h"
27			#include "libavutil/parseutils.h"
28			#include "avformat.h"
29			#include "internal.h"
30			#include "url.h"
31			#include "urldecode.h"
32			#include "libavutil/opt.h"
33			#include "libavutil/bprint.h"
34
35			#define CONTROL_BUFFER_SIZE 1024
36			#define DIR_BUFFER_SIZE 4096
37
38			typedef enum {
39			UNKNOWN,
40			READY,
41			DOWNLOADING,
42			UPLOADING,
43			LISTING_DIR,
44			DISCONNECTED,
45			ENDOFFILE,
46			} FTPState;
47
48			typedef enum {
49			UNKNOWN_METHOD,
50			NLST,
51			MLSD
52			} FTPListingMethod;
53
54			typedef struct {
55			const AVClass *class;
56			URLContext *conn_control; /**< Control connection */
57			URLContext *conn_data; /**< Data connection, NULL when not connected */
58			uint8_t control_buffer[CONTROL_BUFFER_SIZE]; /**< Control connection buffer */
59			uint8_t *control_buf_ptr, *control_buf_end;
60			int server_data_port; /**< Data connection port opened by server, -1 on error. */
61			int server_control_port; /**< Control connection port, default is 21 */
62			char *hostname; /**< Server address. */
63			char *user; /**< Server user */
64			char *password; /**< Server user's password */
65			char *path; /**< Path to resource on server. */
66			int64_t filesize; /**< Size of file on server, -1 on error. */
67			int64_t position; /**< Current position, calculated. */
68			int rw_timeout; /**< Network timeout. */
69			const char *anonymous_password; /**< Password to be used for anonymous user. An email should be used. */
70			int write_seekable; /**< Control seekability, 0 = disable, 1 = enable. */
71			FTPState state; /**< State of data connection */
72			FTPListingMethod listing_method; /**< Called listing method */
73			char *features; /**< List of server's features represented as raw response */
74			char *dir_buffer;
75			size_t dir_buffer_size;
76			size_t dir_buffer_offset;
77			int utf8;
78			const char *option_user; /**< User to be used if none given in the URL */
79			const char *option_password; /**< Password to be used if none given in the URL */
80			} FTPContext;
81
82			#define OFFSET(x) offsetof(FTPContext, x)
83			#define D AV_OPT_FLAG_DECODING_PARAM
84			#define E AV_OPT_FLAG_ENCODING_PARAM
85			static const AVOption options[] = {
86			{"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
87			{"ftp-write-seekable", "control seekability of connection during encoding", OFFSET(write_seekable), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
88			{"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 },
89			{"ftp-user", "user for FTP login. Overridden by whatever is in the URL.", OFFSET(option_user), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
90			{"ftp-password", "password for FTP login. Overridden by whatever is in the URL.", OFFSET(option_password), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
91			{NULL}
92			};
93
94			static const AVClass ftp_context_class = {
95			.class_name = "ftp",
96			.item_name = av_default_item_name,
97			.option = options,
98			.version = LIBAVUTIL_VERSION_INT,
99			};
100
101			static int ftp_close(URLContext *h);
102
103		✗	static int ftp_getc(FTPContext *s)
104			{
105			int len;
106		✗	if (s->control_buf_ptr >= s->control_buf_end) {
107		✗	len = ffurl_read(s->conn_control, s->control_buffer, CONTROL_BUFFER_SIZE);
108		✗	if (len < 0) {
109		✗	return len;
110		✗	} else if (!len) {
111		✗	return -1;
112			} else {
113		✗	s->control_buf_ptr = s->control_buffer;
114		✗	s->control_buf_end = s->control_buffer + len;
115			}
116			}
117		✗	return *s->control_buf_ptr++;
118			}
119
120		✗	static int ftp_get_line(FTPContext *s, char *line, int line_size)
121			{
122			int ch;
123		✗	char *q = line;
124
125			for (;;) {
126		✗	ch = ftp_getc(s);
127		✗	if (ch < 0) {
128		✗	return ch;
129			}
130		✗	if (ch == '\n') {
131			/* process line */
132		✗	if (q > line && q[-1] == '\r')
133		✗	q--;
134		✗	*q = '\0';
135		✗	return 0;
136			} else {
137		✗	if ((q - line) < line_size - 1)
138		✗	*q++ = ch;
139			}
140			}
141			}
142
143			/*
144			* This routine returns ftp server response code.
145			* Server may send more than one response for a certain command.
146			* First expected code is returned.
147			*/
148		✗	static int ftp_status(FTPContext *s, char **line, const int response_codes[])
149			{
150		✗	int err, i, dash = 0, result = 0, code_found = 0, linesize;
151			char buf[CONTROL_BUFFER_SIZE];
152			AVBPrint line_buffer;
153
154		✗	if (line)
155		✗	av_bprint_init(&line_buffer, 0, AV_BPRINT_SIZE_AUTOMATIC);
156
157		✗	while (!code_found || dash) {
158		✗	if ((err = ftp_get_line(s, buf, sizeof(buf))) < 0) {
159		✗	if (line)
160		✗	av_bprint_finalize(&line_buffer, NULL);
161		✗	return err;
162			}
163
164		✗	av_log(s, AV_LOG_DEBUG, "%s\n", buf);
165
166		✗	linesize = strlen(buf);
167		✗	err = 0;
168		✗	if (linesize >= 3) {
169		✗	for (i = 0; i < 3; ++i) {
170		✗	if (buf[i] < '0' || buf[i] > '9') {
171		✗	err = 0;
172		✗	break;
173			}
174		✗	err *= 10;
175		✗	err += buf[i] - '0';
176			}
177			}
178
179		✗	if (!code_found) {
180		✗	if (err >= 500) {
181		✗	code_found = 1;
182		✗	result = err;
183			} else
184		✗	for (i = 0; response_codes[i]; ++i) {
185		✗	if (err == response_codes[i]) {
186		✗	code_found = 1;
187		✗	result = err;
188		✗	break;
189			}
190			}
191			}
192		✗	if (code_found) {
193		✗	if (line)
194		✗	av_bprintf(&line_buffer, "%s\r\n", buf);
195		✗	if (linesize >= 4) {
196		✗	if (!dash && buf[3] == '-')
197		✗	dash = err;
198		✗	else if (err == dash && buf[3] == ' ')
199		✗	dash = 0;
200			}
201			}
202			}
203
204		✗	if (line)
205		✗	av_bprint_finalize(&line_buffer, line);
206		✗	return result;
207			}
208
209		✗	static int ftp_send_command(FTPContext *s, const char *command,
210			const int response_codes[], char **response)
211			{
212			int err;
213
214			ff_dlog(s, "%s", command);
215
216		✗	if (response)
217		✗	*response = NULL;
218
219		✗	if (!s->conn_control)
220		✗	return AVERROR(EIO);
221
222		✗	if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
223		✗	return err;
224		✗	if (!err)
225		✗	return -1;
226
227			/* return status */
228		✗	if (response_codes) {
229		✗	return ftp_status(s, response, response_codes);
230			}
231		✗	return 0;
232			}
233
234		✗	static void ftp_close_data_connection(FTPContext *s)
235			{
236		✗	ffurl_closep(&s->conn_data);
237		✗	s->state = DISCONNECTED;
238		✗	}
239
240		✗	static void ftp_close_both_connections(FTPContext *s)
241			{
242		✗	ffurl_closep(&s->conn_control);
243		✗	ftp_close_data_connection(s);
244		✗	}
245
246		✗	static int ftp_auth(FTPContext *s)
247			{
248			char buf[CONTROL_BUFFER_SIZE];
249			int err;
250			static const int user_codes[] = {331, 230, 0};
251			static const int pass_codes[] = {230, 0};
252
253		✗	if (strpbrk(s->user, "\r\n"))
254		✗	return AVERROR(EINVAL);
255		✗	err = snprintf(buf, sizeof(buf), "USER %s\r\n", s->user);
256		✗	if (err >= sizeof(buf))
257		✗	return AVERROR(ENOSYS);
258
259		✗	err = ftp_send_command(s, buf, user_codes, NULL);
260		✗	if (err == 331) {
261		✗	if (s->password) {
262		✗	if (strpbrk(s->password, "\r\n"))
263		✗	return AVERROR(EINVAL);
264		✗	err = snprintf(buf, sizeof(buf), "PASS %s\r\n", s->password);
265		✗	if (err >= sizeof(buf))
266		✗	return AVERROR(ENOSYS);
267
268		✗	err = ftp_send_command(s, buf, pass_codes, NULL);
269			} else
270		✗	return AVERROR(EACCES);
271			}
272		✗	if (err != 230)
273		✗	return AVERROR(EACCES);
274
275		✗	return 0;
276			}
277
278		✗	static int ftp_passive_mode_epsv(FTPContext *s)
279			{
280		✗	char *res = NULL, *start = NULL, *end = NULL;
281			int i;
282			static const char d = '|';
283			static const char *command = "EPSV\r\n";
284			static const int epsv_codes[] = {229, 0};
285
286		✗	if (ftp_send_command(s, command, epsv_codes, &res) != 229 || !res)
287		✗	goto fail;
288
289		✗	for (i = 0; res[i]; ++i) {
290		✗	if (res[i] == '(') {
291		✗	start = res + i + 1;
292		✗	} else if (res[i] == ')') {
293		✗	end = res + i;
294		✗	break;
295			}
296			}
297		✗	if (!start || !end)
298		✗	goto fail;
299
300		✗	*end = '\0';
301		✗	if (strlen(start) < 5)
302		✗	goto fail;
303		✗	if (start[0] != d || start[1] != d || start[2] != d || end[-1] != d)
304		✗	goto fail;
305		✗	start += 3;
306		✗	end[-1] = '\0';
307
308		✗	s->server_data_port = atoi(start);
309			ff_dlog(s, "Server data port: %d\n", s->server_data_port);
310
311		✗	av_free(res);
312		✗	return 0;
313
314		✗	fail:
315		✗	av_free(res);
316		✗	s->server_data_port = -1;
317		✗	return AVERROR(ENOSYS);
318			}
319
320		✗	static int ftp_passive_mode(FTPContext *s)
321			{
322		✗	char *res = NULL, *start = NULL, *end = NULL;
323			int i;
324			static const char *command = "PASV\r\n";
325			static const int pasv_codes[] = {227, 0};
326
327		✗	if (ftp_send_command(s, command, pasv_codes, &res) != 227 || !res)
328		✗	goto fail;
329
330		✗	for (i = 0; res[i]; ++i) {
331		✗	if (res[i] == '(') {
332		✗	start = res + i + 1;
333		✗	} else if (res[i] == ')') {
334		✗	end = res + i;
335		✗	break;
336			}
337			}
338		✗	if (!start || !end)
339		✗	goto fail;
340
341		✗	*end = '\0';
342			/* skip ip */
343		✗	if (!av_strtok(start, ",", &end)) goto fail;
344		✗	if (!av_strtok(NULL, ",", &end)) goto fail;
345		✗	if (!av_strtok(NULL, ",", &end)) goto fail;
346		✗	if (!av_strtok(NULL, ",", &end)) goto fail;
347
348			/* parse port number */
349		✗	start = av_strtok(NULL, ",", &end);
350		✗	if (!start) goto fail;
351		✗	s->server_data_port = atoi(start) * 256;
352		✗	start = av_strtok(NULL, ",", &end);
353		✗	if (!start) goto fail;
354		✗	s->server_data_port += atoi(start);
355			ff_dlog(s, "Server data port: %d\n", s->server_data_port);
356
357		✗	av_free(res);
358		✗	return 0;
359
360		✗	fail:
361		✗	av_free(res);
362		✗	s->server_data_port = -1;
363		✗	return AVERROR(EIO);
364			}
365
366		✗	static int ftp_current_dir(FTPContext *s)
367			{
368		✗	char *res = NULL, *start = NULL, *end = NULL;
369			int i;
370			static const char *command = "PWD\r\n";
371			static const int pwd_codes[] = {257, 0};
372
373		✗	if (ftp_send_command(s, command, pwd_codes, &res) != 257 || !res)
374		✗	goto fail;
375
376		✗	for (i = 0; res[i]; ++i) {
377		✗	if (res[i] == '"') {
378		✗	if (!start) {
379		✗	start = res + i + 1;
380		✗	continue;
381			}
382		✗	end = res + i;
383		✗	break;
384			}
385			}
386
387		✗	if (!end)
388		✗	goto fail;
389
390		✗	*end = '\0';
391		✗	s->path = av_strdup(start);
392
393		✗	av_free(res);
394
395		✗	if (!s->path)
396		✗	return AVERROR(ENOMEM);
397		✗	return 0;
398
399		✗	fail:
400		✗	av_free(res);
401		✗	return AVERROR(EIO);
402			}
403
404		✗	static int ftp_file_size(FTPContext *s)
405			{
406			char command[CONTROL_BUFFER_SIZE];
407		✗	char *res = NULL;
408			int ret;
409			static const int size_codes[] = {213, 0};
410
411		✗	ret = snprintf(command, sizeof(command), "SIZE %s\r\n", s->path);
412		✗	if (ret >= sizeof(command))
413		✗	return AVERROR(ENOSYS);
414
415		✗	if (ftp_send_command(s, command, size_codes, &res) == 213 && res && strlen(res) > 4) {
416		✗	s->filesize = strtoll(&res[4], NULL, 10);
417			} else {
418		✗	s->filesize = -1;
419		✗	av_free(res);
420		✗	return AVERROR(EIO);
421			}
422
423		✗	av_free(res);
424		✗	return 0;
425			}
426
427		✗	static int ftp_retrieve(FTPContext *s)
428			{
429			char command[CONTROL_BUFFER_SIZE];
430			static const int retr_codes[] = {150, 125, 0};
431			int resp_code, ret;
432
433		✗	ret = snprintf(command, sizeof(command), "RETR %s\r\n", s->path);
434		✗	if (ret >= sizeof(command))
435		✗	return AVERROR(ENOSYS);
436
437		✗	resp_code = ftp_send_command(s, command, retr_codes, NULL);
438		✗	if (resp_code != 125 && resp_code != 150)
439		✗	return AVERROR(EIO);
440
441		✗	s->state = DOWNLOADING;
442
443		✗	return 0;
444			}
445
446		✗	static int ftp_store(FTPContext *s)
447			{
448			char command[CONTROL_BUFFER_SIZE];
449			static const int stor_codes[] = {150, 125, 0};
450			int resp_code, ret;
451
452		✗	ret = snprintf(command, sizeof(command), "STOR %s\r\n", s->path);
453		✗	if (ret >= sizeof(command))
454		✗	return AVERROR(ENOSYS);
455
456		✗	resp_code = ftp_send_command(s, command, stor_codes, NULL);
457		✗	if (resp_code != 125 && resp_code != 150)
458		✗	return AVERROR(EIO);
459
460		✗	s->state = UPLOADING;
461
462		✗	return 0;
463			}
464
465		✗	static int ftp_type(FTPContext *s)
466			{
467			static const char *command = "TYPE I\r\n";
468			static const int type_codes[] = {200, 0};
469
470		✗	if (ftp_send_command(s, command, type_codes, NULL) != 200)
471		✗	return AVERROR(EIO);
472
473		✗	return 0;
474			}
475
476		✗	static int ftp_restart(FTPContext *s, int64_t pos)
477			{
478			char command[CONTROL_BUFFER_SIZE];
479			static const int rest_codes[] = {350, 0};
480
481		✗	snprintf(command, sizeof(command), "REST %"PRId64"\r\n", pos);
482		✗	if (ftp_send_command(s, command, rest_codes, NULL) != 350)
483		✗	return AVERROR(EIO);
484
485		✗	return 0;
486			}
487
488		✗	static int ftp_set_dir(FTPContext *s)
489			{
490			static const int cwd_codes[] = {250, 550, 0}; /* 550 is incorrect code */
491			char command[MAX_URL_SIZE];
492			int ret;
493
494		✗	ret = snprintf(command, sizeof(command), "CWD %s\r\n", s->path);
495		✗	if (ret >= sizeof(command))
496		✗	return AVERROR(ENOSYS);
497
498		✗	if (ftp_send_command(s, command, cwd_codes, NULL) != 250)
499		✗	return AVERROR(EIO);
500		✗	return 0;
501			}
502
503		✗	static int ftp_list_mlsd(FTPContext *s)
504			{
505			static const char *command = "MLSD\r\n";
506			static const int mlsd_codes[] = {150, 500, 0}; /* 500 is incorrect code */
507
508		✗	if (ftp_send_command(s, command, mlsd_codes, NULL) != 150)
509		✗	return AVERROR(ENOSYS);
510		✗	s->listing_method = MLSD;
511		✗	return 0;
512			}
513
514		✗	static int ftp_list_nlst(FTPContext *s)
515			{
516			static const char *command = "NLST\r\n";
517			static const int nlst_codes[] = {226, 425, 426, 451, 450, 550, 0};
518
519		✗	if (ftp_send_command(s, command, nlst_codes, NULL) != 226)
520		✗	return AVERROR(ENOSYS);
521		✗	s->listing_method = NLST;
522		✗	return 0;
523			}
524
525		✗	static int ftp_list(FTPContext *s)
526			{
527			int ret;
528		✗	s->state = LISTING_DIR;
529
530		✗	if ((ret = ftp_list_mlsd(s)) < 0)
531		✗	ret = ftp_list_nlst(s);
532
533		✗	return ret;
534			}
535
536		✗	static int ftp_has_feature(FTPContext *s, const char *feature_name)
537			{
538		✗	if (!s->features)
539		✗	return 0;
540
541		✗	return av_stristr(s->features, feature_name) != NULL;
542			}
543
544		✗	static int ftp_features(FTPContext *s)
545			{
546			static const char *feat_command = "FEAT\r\n";
547			static const char *enable_utf8_command = "OPTS UTF8 ON\r\n";
548			static const int feat_codes[] = {211, 0};
549			static const int opts_codes[] = {200, 202, 451, 0};
550
551		✗	av_freep(&s->features);
552		✗	if (ftp_send_command(s, feat_command, feat_codes, &s->features) != 211) {
553		✗	av_freep(&s->features);
554			}
555
556		✗	if (ftp_has_feature(s, "UTF8")) {
557		✗	int ret = ftp_send_command(s, enable_utf8_command, opts_codes, NULL);
558		✗	if (ret == 200 || ret == 202)
559		✗	s->utf8 = 1;
560			}
561
562		✗	return 0;
563			}
564
565		✗	static int ftp_connect_control_connection(URLContext *h)
566			{
567		✗	char buf[CONTROL_BUFFER_SIZE], *response = NULL;
568			int err;
569		✗	AVDictionary *opts = NULL;
570		✗	FTPContext *s = h->priv_data;
571			static const int connect_codes[] = {220, 0};
572
573		✗	if (!s->conn_control) {
574		✗	ff_url_join(buf, sizeof(buf), "tcp", NULL,
575		✗	s->hostname, s->server_control_port, NULL);
576		✗	if (s->rw_timeout != -1) {
577		✗	av_dict_set_int(&opts, "timeout", s->rw_timeout, 0);
578			} /* if option is not given, don't pass it and let tcp use its own default */
579		✗	err = ffurl_open_whitelist(&s->conn_control, buf, AVIO_FLAG_READ_WRITE,
580		✗	&h->interrupt_callback, &opts,
581			h->protocol_whitelist, h->protocol_blacklist, h);
582		✗	av_dict_free(&opts);
583		✗	if (err < 0) {
584		✗	av_log(h, AV_LOG_ERROR, "Cannot open control connection\n");
585		✗	return err;
586			}
587
588			/* check if server is ready */
589		✗	if (ftp_status(s, ((h->flags & AVIO_FLAG_WRITE) ? &response : NULL), connect_codes) != 220) {
590		✗	av_log(h, AV_LOG_ERROR, "FTP server not ready for new users\n");
591		✗	return AVERROR(EACCES);
592			}
593
594		✗	if ((h->flags & AVIO_FLAG_WRITE) && av_stristr(response, "pure-ftpd")) {
595		✗	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.");
596			}
597		✗	av_free(response);
598
599		✗	if ((err = ftp_auth(s)) < 0) {
600		✗	av_log(h, AV_LOG_ERROR, "FTP authentication failed\n");
601		✗	return err;
602			}
603
604		✗	if ((err = ftp_type(s)) < 0) {
605		✗	av_log(h, AV_LOG_ERROR, "Set content type failed\n");
606		✗	return err;
607			}
608
609		✗	ftp_features(s);
610			}
611		✗	return 0;
612			}
613
614		✗	static int ftp_connect_data_connection(URLContext *h)
615			{
616			int err;
617			char buf[CONTROL_BUFFER_SIZE];
618		✗	AVDictionary *opts = NULL;
619		✗	FTPContext *s = h->priv_data;
620
621		✗	if (!s->conn_data) {
622			/* Enter passive mode */
623		✗	if (ftp_passive_mode_epsv(s) < 0) {
624			/* Use PASV as fallback */
625		✗	if ((err = ftp_passive_mode(s)) < 0)
626		✗	return err;
627			}
628			/* Open data connection */
629		✗	ff_url_join(buf, sizeof(buf), "tcp", NULL, s->hostname, s->server_data_port, NULL);
630		✗	if (s->rw_timeout != -1) {
631		✗	av_dict_set_int(&opts, "timeout", s->rw_timeout, 0);
632			} /* if option is not given, don't pass it and let tcp use its own default */
633		✗	err = ffurl_open_whitelist(&s->conn_data, buf, h->flags,
634		✗	&h->interrupt_callback, &opts,
635			h->protocol_whitelist, h->protocol_blacklist, h);
636		✗	av_dict_free(&opts);
637		✗	if (err < 0)
638		✗	return err;
639
640		✗	if (s->position)
641		✗	if ((err = ftp_restart(s, s->position)) < 0)
642		✗	return err;
643			}
644		✗	s->state = READY;
645		✗	return 0;
646			}
647
648		✗	static int ftp_abort(URLContext *h)
649			{
650			static const char *command = "ABOR\r\n";
651			int err;
652			static const int abor_codes[] = {225, 226, 0};
653		✗	FTPContext *s = h->priv_data;
654
655			/* According to RCF 959:
656			"ABOR command tells the server to abort the previous FTP
657			service command and any associated transfer of data."
658
659			There are FTP server implementations that don't response
660			to any commands during data transfer in passive mode (including ABOR).
661
662			This implementation closes data connection by force.
663			*/
664
665		✗	if (ftp_send_command(s, command, NULL, NULL) < 0) {
666		✗	ftp_close_both_connections(s);
667		✗	if ((err = ftp_connect_control_connection(h)) < 0) {
668		✗	av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
669		✗	return err;
670			}
671			} else {
672		✗	ftp_close_data_connection(s);
673		✗	if (ftp_status(s, NULL, abor_codes) < 225) {
674			/* wu-ftpd also closes control connection after data connection closing */
675		✗	ffurl_closep(&s->conn_control);
676		✗	if ((err = ftp_connect_control_connection(h)) < 0) {
677		✗	av_log(h, AV_LOG_ERROR, "Reconnect failed.\n");
678		✗	return err;
679			}
680			}
681			}
682
683		✗	return 0;
684			}
685
686		✗	static int ftp_connect(URLContext *h, const char *url)
687			{
688			char proto[10], path[MAX_URL_SIZE], credentials[MAX_URL_SIZE], hostname[MAX_URL_SIZE];
689		✗	const char *tok_user = NULL, *tok_pass = NULL;
690		✗	char *newpath = NULL;
691			int err;
692		✗	FTPContext *s = h->priv_data;
693
694		✗	s->state = DISCONNECTED;
695		✗	s->listing_method = UNKNOWN_METHOD;
696		✗	s->filesize = -1;
697		✗	s->position = 0;
698		✗	s->features = NULL;
699
700		✗	av_url_split(proto, sizeof(proto),
701			credentials, sizeof(credentials),
702			hostname, sizeof(hostname),
703			&s->server_control_port,
704			path, sizeof(path),
705			url);
706
707		✗	if (!*credentials) {
708		✗	if (!s->option_user) {
709		✗	tok_user = "anonymous";
710		✗	tok_pass = av_x_if_null(s->anonymous_password, "nopassword");
711			} else {
712		✗	tok_user = s->option_user;
713		✗	tok_pass = s->option_password;
714			}
715		✗	s->user = av_strdup(tok_user);
716		✗	s->password = av_strdup(tok_pass);
717			} else {
718		✗	char *pass = strchr(credentials, ':');
719		✗	if (pass) {
720		✗	*pass++ = '\0';
721		✗	tok_pass = pass;
722		✗	s->password = ff_urldecode(pass, 0);
723			} else {
724		✗	tok_pass = s->option_password;
725		✗	s->password = av_strdup(tok_pass);
726			}
727		✗	s->user = ff_urldecode(credentials, 0);
728			}
729		✗	s->hostname = av_strdup(hostname);
730		✗	if (!s->hostname || !s->user || (tok_pass && !s->password)) {
731		✗	return AVERROR(ENOMEM);
732			}
733
734		✗	if (s->server_control_port < 0 || s->server_control_port > 65535)
735		✗	s->server_control_port = 21;
736
737		✗	if ((err = ftp_connect_control_connection(h)) < 0)
738		✗	return err;
739
740		✗	if ((err = ftp_current_dir(s)) < 0)
741		✗	return err;
742
743		✗	newpath = av_append_path_component(s->path, path);
744		✗	if (!newpath)
745		✗	return AVERROR(ENOMEM);
746		✗	av_free(s->path);
747		✗	s->path = newpath;
748
749		✗	return 0;
750			}
751
752		✗	static int ftp_open(URLContext *h, const char *url, int flags)
753			{
754		✗	FTPContext *s = h->priv_data;
755			int err;
756
757			ff_dlog(h, "ftp protocol open\n");
758
759		✗	if ((err = ftp_connect(h, url)) < 0)
760		✗	goto fail;
761
762		✗	if (ftp_restart(s, 0) < 0) {
763		✗	h->is_streamed = 1;
764			} else {
765		✗	ftp_file_size(s);
766		✗	if (s->write_seekable != 1 && flags & AVIO_FLAG_WRITE)
767		✗	h->is_streamed = 1;
768			}
769
770		✗	return 0;
771
772		✗	fail:
773		✗	av_log(h, AV_LOG_ERROR, "FTP open failed\n");
774		✗	ftp_close(h);
775		✗	return err;
776			}
777
778		✗	static int64_t ftp_seek(URLContext *h, int64_t pos, int whence)
779			{
780		✗	FTPContext *s = h->priv_data;
781			int err;
782			int64_t new_pos;
783
784			ff_dlog(h, "ftp protocol seek %"PRId64" %d\n", pos, whence);
785
786		✗	switch(whence) {
787		✗	case AVSEEK_SIZE:
788		✗	return s->filesize;
789		✗	case SEEK_SET:
790		✗	new_pos = pos;
791		✗	break;
792		✗	case SEEK_CUR:
793		✗	new_pos = s->position + pos;
794		✗	break;
795		✗	case SEEK_END:
796		✗	if (s->filesize < 0)
797		✗	return AVERROR(EIO);
798		✗	new_pos = s->filesize + pos;
799		✗	break;
800		✗	default:
801		✗	return AVERROR(EINVAL);
802			}
803
804		✗	if (h->is_streamed)
805		✗	return AVERROR(EIO);
806
807		✗	if (new_pos < 0) {
808		✗	av_log(h, AV_LOG_ERROR, "Seeking to negative position.\n");
809		✗	return AVERROR(EINVAL);
810			}
811
812		✗	if (new_pos != s->position) {
813		✗	if ((err = ftp_abort(h)) < 0)
814		✗	return err;
815		✗	s->position = new_pos;
816			}
817		✗	return new_pos;
818			}
819
820		✗	static int ftp_read(URLContext *h, unsigned char *buf, int size)
821			{
822		✗	FTPContext *s = h->priv_data;
823		✗	int read, err, retry_done = 0;
824
825			ff_dlog(h, "ftp protocol read %d bytes\n", size);
826		✗	retry:
827		✗	if (s->state == ENDOFFILE)
828		✗	return AVERROR_EOF;
829		✗	if (s->state == DISCONNECTED) {
830		✗	if ((err = ftp_connect_data_connection(h)) < 0)
831		✗	return err;
832			}
833		✗	if (s->state == READY) {
834		✗	if ((err = ftp_retrieve(s)) < 0)
835		✗	return err;
836			}
837		✗	if (s->conn_data && s->state == DOWNLOADING) {
838		✗	read = ffurl_read(s->conn_data, buf, size);
839		✗	if (read >= 0) {
840		✗	s->position += read;
841		✗	s->filesize = FFMAX(s->filesize, s->position);
842			}
843		✗	if (read == AVERROR_EOF) {
844			static const int retr_codes[] = {226, 250, 425, 426, 451, 0};
845		✗	char *response = NULL;
846		✗	err = ftp_status(s, &response, retr_codes);
847		✗	if (err == 226) {
848		✗	ftp_close_data_connection(s);
849		✗	av_freep(&response);
850		✗	s->state = ENDOFFILE;
851		✗	return AVERROR_EOF;
852			}
853			/* 250 is not allowed, any other status means some kind of error */
854		✗	av_log(h, AV_LOG_ERROR, "FTP transfer failed: %s\n", response ? response : (err < 0 ? av_err2str(err) : "?"));
855		✗	av_freep(&response);
856		✗	read = AVERROR(EIO);
857			}
858		✗	if (read <= 0 && !h->is_streamed) {
859			/* Server closed connection. Probably due to inactivity */
860		✗	av_log(h, AV_LOG_INFO, "Reconnect to FTP server.\n");
861		✗	if ((err = ftp_abort(h)) < 0)
862		✗	return err;
863		✗	if (!retry_done) {
864		✗	retry_done = 1;
865		✗	goto retry;
866			}
867			}
868		✗	return read;
869			}
870
871		✗	av_log(h, AV_LOG_DEBUG, "FTP read failed\n");
872		✗	return AVERROR(EIO);
873			}
874
875		✗	static int ftp_write(URLContext *h, const unsigned char *buf, int size)
876			{
877			int err;
878		✗	FTPContext *s = h->priv_data;
879			int written;
880
881			ff_dlog(h, "ftp protocol write %d bytes\n", size);
882
883		✗	if (s->state == DISCONNECTED) {
884		✗	if ((err = ftp_connect_data_connection(h)) < 0)
885		✗	return err;
886			}
887		✗	if (s->state == READY) {
888		✗	if ((err = ftp_store(s)) < 0)
889		✗	return err;
890			}
891		✗	if (s->conn_data && s->state == UPLOADING) {
892		✗	written = ffurl_write(s->conn_data, buf, size);
893		✗	if (written > 0) {
894		✗	s->position += written;
895		✗	s->filesize = FFMAX(s->filesize, s->position);
896			}
897		✗	return written;
898			}
899
900		✗	av_log(h, AV_LOG_ERROR, "FTP write failed\n");
901		✗	return AVERROR(EIO);
902			}
903
904		✗	static int ftp_close(URLContext *h)
905			{
906		✗	FTPContext *s = h->priv_data;
907
908			ff_dlog(h, "ftp protocol close\n");
909
910		✗	ftp_close_both_connections(s);
911		✗	av_freep(&s->user);
912		✗	av_freep(&s->password);
913		✗	av_freep(&s->hostname);
914		✗	av_freep(&s->path);
915		✗	av_freep(&s->features);
916
917		✗	return 0;
918			}
919
920		✗	static int ftp_get_file_handle(URLContext *h)
921			{
922		✗	FTPContext *s = h->priv_data;
923
924			ff_dlog(h, "ftp protocol get_file_handle\n");
925
926		✗	if (s->conn_data)
927		✗	return ffurl_get_file_handle(s->conn_data);
928
929		✗	return AVERROR(EIO);
930			}
931
932		✗	static int ftp_shutdown(URLContext *h, int flags)
933			{
934		✗	FTPContext *s = h->priv_data;
935
936			ff_dlog(h, "ftp protocol shutdown\n");
937
938		✗	if (s->conn_data)
939		✗	return ffurl_shutdown(s->conn_data, flags);
940
941		✗	return AVERROR(EIO);
942			}
943
944		✗	static int ftp_open_dir(URLContext *h)
945			{
946		✗	FTPContext *s = h->priv_data;
947			int ret;
948
949		✗	if ((ret = ftp_connect(h, h->filename)) < 0)
950		✗	goto fail;
951		✗	if ((ret = ftp_set_dir(s)) < 0)
952		✗	goto fail;
953		✗	if ((ret = ftp_connect_data_connection(h)) < 0)
954		✗	goto fail;
955		✗	if ((ret = ftp_list(s)) < 0)
956		✗	goto fail;
957		✗	s->dir_buffer = av_malloc(DIR_BUFFER_SIZE);
958		✗	if (!s->dir_buffer) {
959		✗	ret = AVERROR(ENOMEM);
960		✗	goto fail;
961			}
962		✗	s->dir_buffer[0] = 0;
963		✗	if (s->conn_data && s->state == LISTING_DIR)
964		✗	return 0;
965		✗	fail:
966		✗	ffurl_closep(&s->conn_control);
967		✗	ffurl_closep(&s->conn_data);
968		✗	return ret;
969			}
970
971		✗	static int64_t ftp_parse_date(const char *date)
972			{
973			struct tm tv;
974		✗	memset(&tv, 0, sizeof(struct tm));
975		✗	av_small_strptime(date, "%Y%m%d%H%M%S", &tv);
976		✗	return INT64_C(1000000) * av_timegm(&tv);
977			}
978
979		✗	static int ftp_parse_entry_nlst(char *line, AVIODirEntry *next)
980			{
981		✗	next->name = av_strdup(line);
982		✗	return 0;
983			}
984
985		✗	static int ftp_parse_entry_mlsd(char *mlsd, AVIODirEntry *next)
986			{
987			char *fact, *value;
988		✗	char *saveptr = NULL, *p = mlsd;
989			ff_dlog(NULL, "%s\n", mlsd);
990		✗	while(fact = av_strtok(p, ";", &saveptr)) {
991		✗	p = NULL;
992		✗	if (fact[0] == ' ') {
993		✗	next->name = av_strdup(&fact[1]);
994		✗	continue;
995			}
996		✗	fact = av_strtok(fact, "=", &value);
997		✗	if (!fact)
998		✗	continue;
999		✗	if (!av_strcasecmp(fact, "type")) {
1000		✗	if (!av_strcasecmp(value, "cdir") || !av_strcasecmp(value, "pdir"))
1001		✗	return 1;
1002		✗	if (!av_strcasecmp(value, "dir"))
1003		✗	next->type = AVIO_ENTRY_DIRECTORY;
1004		✗	else if (!av_strcasecmp(value, "file"))
1005		✗	next->type = AVIO_ENTRY_FILE;
1006		✗	else if (!av_strcasecmp(value, "OS.unix=slink:"))
1007		✗	next->type = AVIO_ENTRY_SYMBOLIC_LINK;
1008		✗	} else if (!av_strcasecmp(fact, "modify")) {
1009		✗	next->modification_timestamp = ftp_parse_date(value);
1010		✗	} else if (!av_strcasecmp(fact, "UNIX.mode")) {
1011		✗	next->filemode = strtoumax(value, NULL, 8);
1012		✗	} else if (!av_strcasecmp(fact, "UNIX.uid") || !av_strcasecmp(fact, "UNIX.owner"))
1013		✗	next->user_id = strtoumax(value, NULL, 10);
1014		✗	else if (!av_strcasecmp(fact, "UNIX.gid") || !av_strcasecmp(fact, "UNIX.group"))
1015		✗	next->group_id = strtoumax(value, NULL, 10);
1016		✗	else if (!av_strcasecmp(fact, "size") || !av_strcasecmp(fact, "sizd"))
1017		✗	next->size = strtoll(value, NULL, 10);
1018			}
1019		✗	return 0;
1020			}
1021
1022			/**
1023			* @return 0 on success, negative on error, positive on entry to discard.
1024			*/
1025		✗	static int ftp_parse_entry(URLContext *h, char *line, AVIODirEntry *next)
1026			{
1027		✗	FTPContext *s = h->priv_data;
1028
1029		✗	switch (s->listing_method) {
1030		✗	case MLSD:
1031		✗	return ftp_parse_entry_mlsd(line, next);
1032		✗	case NLST:
1033		✗	return ftp_parse_entry_nlst(line, next);
1034		✗	case UNKNOWN_METHOD:
1035			default:
1036		✗	return -1;
1037			}
1038			}
1039
1040		✗	static int ftp_read_dir(URLContext *h, AVIODirEntry **next)
1041			{
1042		✗	FTPContext *s = h->priv_data;
1043			char *start, *found;
1044			int ret, retried;
1045
1046			do {
1047		✗	retried = 0;
1048		✗	start = s->dir_buffer + s->dir_buffer_offset;
1049		✗	while (!(found = strstr(start, "\n"))) {
1050		✗	if (retried)
1051		✗	return AVERROR(EIO);
1052		✗	s->dir_buffer_size -= s->dir_buffer_offset;
1053		✗	s->dir_buffer_offset = 0;
1054		✗	if (s->dir_buffer_size)
1055		✗	memmove(s->dir_buffer, start, s->dir_buffer_size);
1056		✗	ret = ffurl_read(s->conn_data, s->dir_buffer + s->dir_buffer_size, DIR_BUFFER_SIZE - (s->dir_buffer_size + 1));
1057		✗	if (ret < 0)
1058		✗	return ret;
1059		✗	if (!ret) {
1060		✗	*next = NULL;
1061		✗	return 0;
1062			}
1063		✗	s->dir_buffer_size += ret;
1064		✗	s->dir_buffer[s->dir_buffer_size] = 0;
1065		✗	start = s->dir_buffer;
1066		✗	retried = 1;
1067			}
1068		✗	s->dir_buffer_offset += (found + 1 - start);
1069		✗	found[0] = 0;
1070		✗	if (found > start && found[-1] == '\r')
1071		✗	found[-1] = 0;
1072
1073		✗	*next = ff_alloc_dir_entry();
1074		✗	if (!*next)
1075		✗	return AVERROR(ENOMEM);
1076		✗	(*next)->utf8 = s->utf8;
1077		✗	ret = ftp_parse_entry(h, start, *next);
1078		✗	if (ret) {
1079		✗	avio_free_directory_entry(next);
1080		✗	if (ret < 0)
1081		✗	return ret;
1082			}
1083		✗	} while (ret > 0);
1084		✗	return 0;
1085			}
1086
1087		✗	static int ftp_close_dir(URLContext *h)
1088			{
1089		✗	FTPContext *s = h->priv_data;
1090		✗	av_freep(&s->dir_buffer);
1091		✗	ffurl_closep(&s->conn_control);
1092		✗	ffurl_closep(&s->conn_data);
1093		✗	return 0;
1094			}
1095
1096		✗	static int ftp_delete(URLContext *h)
1097			{
1098		✗	FTPContext *s = h->priv_data;
1099			char command[MAX_URL_SIZE];
1100			static const int del_codes[] = {250, 421, 450, 500, 501, 502, 530, 550, 0};
1101			static const int rmd_codes[] = {250, 421, 500, 501, 502, 530, 550, 0};
1102			int ret;
1103
1104		✗	if ((ret = ftp_connect(h, h->filename)) < 0)
1105		✗	goto cleanup;
1106
1107		✗	ret = snprintf(command, sizeof(command), "DELE %s\r\n", s->path);
1108		✗	if (ret >= sizeof(command)) {
1109		✗	ret = AVERROR(ENOSYS);
1110		✗	goto cleanup;
1111			}
1112
1113		✗	if (ftp_send_command(s, command, del_codes, NULL) == 250) {
1114		✗	ret = 0;
1115		✗	goto cleanup;
1116			}
1117
1118		✗	ret = snprintf(command, sizeof(command), "RMD %s\r\n", s->path);
1119		✗	if (ret >= sizeof(command)) {
1120		✗	ret = AVERROR(ENOSYS);
1121		✗	goto cleanup;
1122			}
1123
1124		✗	if (ftp_send_command(s, command, rmd_codes, NULL) == 250)
1125		✗	ret = 0;
1126			else
1127		✗	ret = AVERROR(EIO);
1128
1129		✗	cleanup:
1130		✗	ftp_close(h);
1131		✗	return ret;
1132			}
1133
1134		✗	static int ftp_move(URLContext *h_src, URLContext *h_dst)
1135			{
1136		✗	FTPContext *s = h_src->priv_data;
1137			char command[MAX_URL_SIZE], path[MAX_URL_SIZE];
1138			static const int rnfr_codes[] = {350, 421, 450, 500, 501, 502, 503, 530, 0};
1139			static const int rnto_codes[] = {250, 421, 500, 501, 502, 503, 530, 532, 553, 0};
1140			int ret;
1141
1142		✗	if ((ret = ftp_connect(h_src, h_src->filename)) < 0)
1143		✗	goto cleanup;
1144
1145		✗	ret = snprintf(command, sizeof(command), "RNFR %s\r\n", s->path);
1146		✗	if (ret >= sizeof(command)) {
1147		✗	ret = AVERROR(ENOSYS);
1148		✗	goto cleanup;
1149			}
1150
1151		✗	if (ftp_send_command(s, command, rnfr_codes, NULL) != 350) {
1152		✗	ret = AVERROR(EIO);
1153		✗	goto cleanup;
1154			}
1155
1156		✗	av_url_split(0, 0, 0, 0, 0, 0, 0,
1157			path, sizeof(path),
1158		✗	h_dst->filename);
1159		✗	ret = snprintf(command, sizeof(command), "RNTO %s\r\n", path);
1160		✗	if (ret >= sizeof(command)) {
1161		✗	ret = AVERROR(ENOSYS);
1162		✗	goto cleanup;
1163			}
1164
1165		✗	if (ftp_send_command(s, command, rnto_codes, NULL) == 250)
1166		✗	ret = 0;
1167			else
1168		✗	ret = AVERROR(EIO);
1169
1170		✗	cleanup:
1171		✗	ftp_close(h_src);
1172		✗	return ret;
1173			}
1174
1175			const URLProtocol ff_ftp_protocol = {
1176			.name = "ftp",
1177			.url_open = ftp_open,
1178			.url_read = ftp_read,
1179			.url_write = ftp_write,
1180			.url_seek = ftp_seek,
1181			.url_close = ftp_close,
1182			.url_get_file_handle = ftp_get_file_handle,
1183			.url_shutdown = ftp_shutdown,
1184			.priv_data_size = sizeof(FTPContext),
1185			.priv_data_class = &ftp_context_class,
1186			.url_open_dir = ftp_open_dir,
1187			.url_read_dir = ftp_read_dir,
1188			.url_close_dir = ftp_close_dir,
1189			.url_delete = ftp_delete,
1190			.url_move = ftp_move,
1191			.flags = URL_PROTOCOL_FLAG_NETWORK,
1192			.default_whitelist = "tcp",
1193			};
1194