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mpv/libmpdemux/stream_ftp.c

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C
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#include "config.h"
#ifdef HAVE_FTP
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#ifndef HAVE_WINSOCK2
#include <sys/socket.h>
#define closesocket close
#else
#include <winsock2.h>
#endif
#include "mp_msg.h"
#include "stream.h"
#include "help_mp.h"
#include "m_option.h"
#include "m_struct.h"
static struct stream_priv_s {
char* user;
char* pass;
char* host;
int port;
char* filename;
char *cput,*cget;
int handle;
int cavail,cleft;
char *buf;
} stream_priv_dflts = {
"anonymous","no@spam",
NULL,
21,
NULL,
NULL,
NULL,
0,
0,0,
NULL
};
#define BUFSIZE 2048
#define ST_OFF(f) M_ST_OFF(struct stream_priv_s,f)
/// URL definition
static m_option_t stream_opts_fields[] = {
{"username", ST_OFF(user), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{"password", ST_OFF(pass), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{"hostname", ST_OFF(host), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{"port", ST_OFF(port), CONF_TYPE_INT, 0, 0 ,65635, NULL},
{"filename", ST_OFF(filename), CONF_TYPE_STRING, 0, 0 ,0, NULL},
{ NULL, NULL, 0, 0, 0, 0, NULL }
};
static struct m_struct_st stream_opts = {
"ftp",
sizeof(struct stream_priv_s),
&stream_priv_dflts,
stream_opts_fields
};
#define TELNET_IAC 255 /* interpret as command: */
#define TELNET_IP 244 /* interrupt process--permanently */
#define TELNET_SYNCH 242 /* for telfunc calls */
/*
* read a line of text
*
* return -1 on error or bytecount
*/
static int readline(char *buf,int max,struct stream_priv_s *ctl)
{
int x,retval = 0;
char *end,*bp=buf;
int eof = 0;
do {
if (ctl->cavail > 0) {
x = (max >= ctl->cavail) ? ctl->cavail : max-1;
end = memccpy(bp,ctl->cget,'\n',x);
if (end != NULL)
x = end - bp;
retval += x;
bp += x;
*bp = '\0';
max -= x;
ctl->cget += x;
ctl->cavail -= x;
if (end != NULL) {
bp -= 2;
if (strcmp(bp,"\r\n") == 0) {
*bp++ = '\n';
*bp++ = '\0';
--retval;
}
break;
}
}
if (max == 1) {
*buf = '\0';
break;
}
if (ctl->cput == ctl->cget) {
ctl->cput = ctl->cget = ctl->buf;
ctl->cavail = 0;
ctl->cleft = BUFSIZE;
}
if(eof) {
if (retval == 0)
retval = -1;
break;
}
if ((x = recv(ctl->handle,ctl->cput,ctl->cleft,0)) == -1) {
mp_msg(MSGT_STREAM,MSGL_ERR, "[ftp] read error: %s\n",strerror(errno));
retval = -1;
break;
}
if (x == 0)
eof = 1;
ctl->cleft -= x;
ctl->cavail += x;
ctl->cput += x;
} while (1);
return retval;
}
/*
* read a response from the server
*
* return 0 if first char doesn't match
* return 1 if first char matches
*/
static int readresp(struct stream_priv_s* ctl,char* rsp)
{
static char response[256];
char match[5];
int r;
if (readline(response,256,ctl) == -1)
return 0;
r = atoi(response)/100;
if(rsp) strcpy(rsp,response);
mp_msg(MSGT_STREAM,MSGL_V, "[ftp] < %s",response);
if (response[3] == '-') {
strncpy(match,response,3);
match[3] = ' ';
match[4] = '\0';
do {
if (readline(response,256,ctl) == -1) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] Control socket read failed\n");
return 0;
}
mp_msg(MSGT_OPEN,MSGL_V, "[ftp] < %s",response);
} while (strncmp(response,match,4));
}
return r;
}
static int FtpSendCmd(const char *cmd, struct stream_priv_s *nControl,char* rsp)
{
int l = strlen(cmd);
int hascrlf = cmd[l - 2] == '\r' && cmd[l - 1] == '\n';
mp_msg(MSGT_STREAM,MSGL_V, "[ftp] > %s",cmd);
while(l > 0) {
int s = send(nControl->handle,cmd,l,0);
if(s <= 0) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] write error: %s\n",strerror(errno));
return 0;
}
cmd += s;
l -= s;
}
if (hascrlf)
return readresp(nControl,rsp);
else
return FtpSendCmd("\r\n", nControl, rsp);
}
static int FtpOpenPort(struct stream_priv_s* p) {
int resp,fd;
char rsp_txt[256];
char* par,str[128];
int num[6];
resp = FtpSendCmd("PASV",p,rsp_txt);
if(resp != 2) {
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] command 'PASV' failed: %s\n",rsp_txt);
return 0;
}
par = strchr(rsp_txt,'(');
if(!par || !par[0] || !par[1]) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] invalid server response: %s ??\n",rsp_txt);
return 0;
}
sscanf(par+1,"%u,%u,%u,%u,%u,%u",&num[0],&num[1],&num[2],
&num[3],&num[4],&num[5]);
snprintf(str,127,"%d.%d.%d.%d",num[0],num[1],num[2],num[3]);
fd = connect2Server(str,(num[4]<<8)+num[5],0);
if(fd <= 0) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] failed to create data connection\n");
return 0;
}
return fd;
}
static int fill_buffer(stream_t *s, char* buffer, int max_len){
fd_set fds;
struct timeval tv;
int r;
// Check if there is something to read. This avoid hang
// forever if the network stop responding.
FD_ZERO(&fds);
FD_SET(s->fd,&fds);
tv.tv_sec = 15;
tv.tv_usec = 0;
if(select(s->fd+1, &fds, NULL, NULL, &tv) < 1) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] read timed out\n");
return -1;
}
r = recv(s->fd,buffer,max_len,0);
return (r <= 0) ? -1 : r;
}
static int seek(stream_t *s,off_t newpos) {
struct stream_priv_s* p = s->priv;
int resp;
char str[256],rsp_txt[256];
fd_set fds;
struct timeval tv;
if(s->pos > s->end_pos) {
s->eof=1;
return 0;
}
FD_ZERO(&fds);
FD_SET(p->handle,&fds);
tv.tv_sec = tv.tv_usec = 0;
// Check to see if the server doesn't alredy terminated the transfert
if(select(p->handle+1, &fds, NULL, NULL, &tv) > 0) {
if(readresp(p,rsp_txt) != 2)
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] Warning the server didn't finished the transfert correctly: %s\n",rsp_txt);
closesocket(s->fd);
s->fd = -1;
}
// Close current download
if(s->fd >= 0) {
static const char pre_cmd[]={TELNET_IAC,TELNET_IP,TELNET_IAC,TELNET_SYNCH};
//int fl;
// First close the fd
closesocket(s->fd);
s->fd = 0;
// Send send the telnet sequence needed to make the server react
// Dunno if this is really needed, lftp have it. I let
// it here in case it turn out to be needed on some other OS
//fl=fcntl(p->handle,F_GETFL);
//fcntl(p->handle,F_SETFL,fl&~O_NONBLOCK);
// send only first byte as OOB due to OOB braindamage in many unices
send(p->handle,pre_cmd,1,MSG_OOB);
send(p->handle,pre_cmd+1,sizeof(pre_cmd)-1,0);
//fcntl(p->handle,F_SETFL,fl);
// Get the 426 Transfer aborted
// Or the 226 Transfer complete
resp = readresp(p,rsp_txt);
if(resp != 4 && resp != 2) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] Server didn't abort correctly: %s\n",rsp_txt);
s->eof = 1;
return 0;
}
// Send the ABOR command
// Ignore the return code as sometimes it fail with "nothing to abort"
FtpSendCmd("ABOR",p,rsp_txt);
}
// Open a new connection
s->fd = FtpOpenPort(p);
if(!s->fd) return 0;
if(newpos > 0) {
snprintf(str,255,"REST %"PRId64, (int64_t)newpos);
resp = FtpSendCmd(str,p,rsp_txt);
if(resp != 3) {
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
newpos = 0;
}
}
// Get the file
snprintf(str,255,"RETR %s",p->filename);
resp = FtpSendCmd(str,p,rsp_txt);
if(resp != 1) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
return 0;
}
s->pos = newpos;
return 1;
}
static void close_f(stream_t *s) {
struct stream_priv_s* p = s->priv;
if(!p) return;
if(s->fd > 0) {
closesocket(s->fd);
s->fd = 0;
}
FtpSendCmd("QUIT",p,NULL);
if(p->handle) closesocket(p->handle);
if(p->buf) free(p->buf);
m_struct_free(&stream_opts,p);
}
static int open_f(stream_t *stream,int mode, void* opts, int* file_format) {
int len = 0,resp;
struct stream_priv_s* p = (struct stream_priv_s*)opts;
char str[256],rsp_txt[256];
if(mode != STREAM_READ) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] Unknown open mode %d\n",mode);
m_struct_free(&stream_opts,opts);
return STREAM_UNSUPORTED;
}
if(!p->filename || !p->host) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] Bad url\n");
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
// Open the control connection
p->handle = connect2Server(p->host,p->port,1);
if(p->handle < 0) {
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
// We got a connection, let's start serious things
stream->fd = -1;
stream->priv = p;
p->buf = malloc(BUFSIZE);
if (readresp(p, NULL) == 0) {
close_f(stream);
m_struct_free(&stream_opts,opts);
return STREAM_ERROR;
}
// Login
snprintf(str,255,"USER %s",p->user);
resp = FtpSendCmd(str,p,rsp_txt);
// password needed
if(resp == 3) {
snprintf(str,255,"PASS %s",p->pass);
resp = FtpSendCmd(str,p,rsp_txt);
if(resp != 2) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
close_f(stream);
return STREAM_ERROR;
}
} else if(resp != 2) {
mp_msg(MSGT_OPEN,MSGL_ERR, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
close_f(stream);
return STREAM_ERROR;
}
// Set the transfert type
resp = FtpSendCmd("TYPE I",p,rsp_txt);
if(resp != 2) {
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] command 'TYPE I' failed: %s\n",rsp_txt);
close_f(stream);
return STREAM_ERROR;
}
// Get the filesize
snprintf(str,255,"SIZE %s",p->filename);
resp = FtpSendCmd(str,p,rsp_txt);
if(resp != 2) {
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
} else {
int dummy;
sscanf(rsp_txt,"%d %d",&dummy,&len);
}
// Start the data connection
stream->fd = FtpOpenPort(p);
if(stream->fd <= 0) {
close_f(stream);
return STREAM_ERROR;
}
// Get the file
snprintf(str,255,"RETR %s",p->filename);
resp = FtpSendCmd(str,p,rsp_txt);
if(resp != 1) {
mp_msg(MSGT_OPEN,MSGL_WARN, "[ftp] command '%s' failed: %s\n",str,rsp_txt);
close_f(stream);
return STREAM_ERROR;
}
if(len > 0) {
stream->seek = seek;
stream->end_pos = len;
}
stream->priv = p;
stream->fill_buffer = fill_buffer;
stream->close = close_f;
return STREAM_OK;
}
stream_info_t stream_info_ftp = {
"File Transfer Protocol",
"ftp",
"Albeu",
"reuse a bit of code from ftplib written by Thomas Pfau",
open_f,
{ "ftp", NULL },
&stream_opts,
1 // Urls are an option string
};
#endif
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