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Merge remote-tracking branch 'lukaszmluki/master'

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* lukaszmluki/master:
  ftp: add invalid code for RETR operation
  ftp: probe seek capability
  ftp: fix seeking beyond file size
  ftp: abort function optimalization
  ftp: explicit return code checks
  ftp: fix flush control connection input
  ftp: reconnect on tcp read error

Merged-by: Michael Niedermayer <michaelni@gmx.at>
pull/25/head
Michael Niedermayer 12 years ago
parent f320b00541 ff35c7cdfa
commit 33fb22f800
1 changed files with 77 additions and 34 deletions
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  1. 111
      libavformat/ftp.c

111
libavformat/ftp.c
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@ -138,7 +138,7 @@ static int ftp_flush_control_input(FTPContext *s)
s->conn_control_block_flag = 1;
do {
err = ftp_get_line(s, buf, sizeof(buf));
} while (err > 0);
} while (!err);
s->conn_control_block_flag = ori_block_flag;
@ -172,9 +172,6 @@ static int ftp_status(FTPContext *s, char **line, const int response_codes[])
return result;
}
/* first code received. Now get all lines in non blocking mode */
s->conn_control_block_flag = 1;
av_log(s, AV_LOG_DEBUG, "%s\n", buf);
if (!pref_code_found) {
@ -191,6 +188,8 @@ static int ftp_status(FTPContext *s, char **line, const int response_codes[])
for (i = 0; response_codes[i]; ++i) {
if (err == response_codes[i]) {
/* first code received. Now get all lines in non blocking mode */
s->conn_control_block_flag = 1;
pref_code_found = 1;
result = err;
if (line)
@ -216,19 +215,29 @@ static int ftp_send_command(FTPContext *s, const char *command,
s->conn_control_block_flag = 0;
if ((err = ffurl_write(s->conn_control, command, strlen(command))) < 0)
return err;
if (!err)
return -1;
/* return status */
return ftp_status(s, response, response_codes);
if (response_codes) {
return ftp_status(s, response, response_codes);
}
return 0;
}
static void ftp_close_both_connections(FTPContext *s)
static void ftp_close_data_connection(FTPContext *s)
{
ffurl_closep(&s->conn_control);
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;
@ -369,7 +378,7 @@ static int ftp_file_size(FTPContext *s)
static int ftp_retrieve(FTPContext *s)
{
char command[CONTROL_BUFFER_SIZE];
const int retr_codes[] = {150, 550, 0}; /* 550 is incorrect code */
const int retr_codes[] = {150, 550, 554, 0}; /* 550, 554 are incorrect codes */
snprintf(command, sizeof(command), "RETR %s\r\n", s->path);
if (ftp_send_command(s, command, retr_codes, NULL) != 150)
@ -386,7 +395,7 @@ static int ftp_store(FTPContext *s)
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))
if (ftp_send_command(s, command, stor_codes, NULL) != 150)
return AVERROR(EIO);
s->state = UPLOADING;
@ -408,7 +417,7 @@ static int ftp_type(FTPContext *s)
static int ftp_restart(FTPContext *s, int64_t pos)
{
char command[CONTROL_BUFFER_SIZE];
const int rest_codes[] = {350, 501, 0}; /* 501 is incorrect code */
const int rest_codes[] = {350, 500, 501, 0}; /* 500, 501 are incorrect codes */
snprintf(command, sizeof(command), "REST %"PRId64"\r\n", pos);
if (ftp_send_command(s, command, rest_codes, NULL) != 350)
@ -443,10 +452,9 @@ static int ftp_connect_control_connection(URLContext *h)
}
/* consume all messages from server */
if (!ftp_status(s, NULL, connect_codes)) {
if (ftp_status(s, NULL, connect_codes) != 220) {
av_log(h, AV_LOG_ERROR, "FTP server not ready for new users\n");
err = AVERROR(EACCES);
return err;
return AVERROR(EACCES);
}
if ((err = ftp_auth(s)) < 0) {
@ -497,10 +505,40 @@ static int ftp_connect_data_connection(URLContext *h)
static int ftp_abort(URLContext *h)
{
const char *command = "ABOR\r\n";
int err;
ftp_close_both_connections(h->priv_data);
if ((err = ftp_connect_control_connection(h)) < 0)
return err;
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;
}
@ -535,10 +573,14 @@ static int ftp_open(URLContext *h, const char *url, int flags)
goto fail;
av_strlcat(s->path, path, sizeof(s->path));
if (ftp_file_size(s) < 0 && flags & AVIO_FLAG_READ)
h->is_streamed = 1;
if (s->write_seekable != 1 && flags & AVIO_FLAG_WRITE)
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;
@ -553,7 +595,7 @@ static int64_t ftp_seek(URLContext *h, int64_t pos, int whence)
{
FTPContext *s = h->priv_data;
int err;
int64_t new_pos;
int64_t new_pos, fake_pos;
av_dlog(h, "ftp protocol seek %"PRId64" %d\n", pos, whence);
@ -579,17 +621,12 @@ static int64_t ftp_seek(URLContext *h, int64_t pos, int whence)
return AVERROR(EIO);
new_pos = FFMAX(0, new_pos);
if (s->filesize >= 0)
new_pos = FFMIN(s->filesize, new_pos);
fake_pos = s->filesize != -1 ? FFMIN(new_pos, s->filesize) : new_pos;
if (new_pos != s->position) {
/* XXX: Full abort is a save solution here.
Some optimalizations are possible, but may lead to crazy states of FTP server.
The worst scenario would be when FTP server closed both connection due to no transfer. */
if (fake_pos != s->position) {
if ((err = ftp_abort(h)) < 0)
return err;
s->position = new_pos;
s->position = fake_pos;
}
return new_pos;
}
@ -602,10 +639,14 @@ static int ftp_read(URLContext *h, unsigned char *buf, int size)
av_dlog(h, "ftp protocol read %d bytes\n", size);
retry:
if (s->state == DISCONNECTED) {
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;
}
@ -614,19 +655,21 @@ static int ftp_read(URLContext *h, unsigned char *buf, int size)
if (read >= 0) {
s->position += read;
if (s->position >= s->filesize) {
if (ftp_abort(h) < 0)
/* server will terminate, but keep current position to avoid madness */
int64_t pos = s->position;
if (ftp_abort(h) < 0) {
s->position = pos;
return AVERROR(EIO);
}
s->position = pos;
}
}
if (!read && s->position < s->filesize && !h->is_streamed) {
if (read <= 0 && s->position < s->filesize && !h->is_streamed) {
/* Server closed connection. Probably due to inactivity */
/* TODO: Consider retry before reconnect */
int64_t pos = s->position;
av_log(h, AV_LOG_INFO, "Reconnect to FTP server.\n");
if ((err = ftp_abort(h)) < 0) {
av_log(h, AV_LOG_ERROR, "Reconnect failed.\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;

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