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lavf/ftp: favour EPSV over PASV command

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EPSV is newer version of PASV and allows to use IPv6.

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
This commit is contained in:
Lukasz Marek 2014-05-19 23:53:08 +02:00
parent 37fa4b9bb9
commit b9419b5882
1 changed files with 47 additions and 4 deletions
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47
libavformat/ftp.c
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@ -227,6 +227,48 @@ static int ftp_auth(FTPContext *s)
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, 500, 501, 0}; /* 500, 501 are incorrect codes */
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;
@ -270,8 +312,6 @@ static int ftp_passive_mode(FTPContext *s)
fail:
av_free(res);
s->server_data_port = -1;
av_log(s, AV_LOG_ERROR, "Set passive mode failed\n"
"Your FTP server may use IPv6 which is not supported yet.\n");
return AVERROR(EIO);
}
@ -439,8 +479,11 @@ static int ftp_connect_data_connection(URLContext *h)
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) {