1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/* Start/stop data channel transfer
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <unistd.h>
#include <errno.h>
#include <ftpconn.h>
#include "priv.h"
/* Open a data connection, returning the file descriptor in DATA. */
static error_t
ftp_conn_open_data (struct ftp_conn *conn, int *data)
{
struct sockaddr *addr;
error_t err = ftp_conn_get_pasv_addr (conn, &addr);
if (! err)
{
int dsock = socket (PF_INET, SOCK_STREAM, 0);
if (dsock < 0)
err = errno;
else if (connect (dsock, addr, addr->sa_len) < 0)
{
err = errno;
close (dsock);
}
else
*data = dsock;
free (addr);
}
return err;
}
/* Start a transfer command CMD/ARG, returning a file descriptor in DATA.
POSS_ERRS is a list of errnos to try matching against any resulting error
text. */
error_t
ftp_conn_start_transfer (struct ftp_conn *conn,
const char *cmd, const char *arg,
const error_t *poss_errs,
int *data)
{
error_t err = ftp_conn_open_data (conn, data);
if (! err)
{
int reply;
const char *txt;
err = ftp_conn_cmd (conn, cmd, arg, &reply, &txt);
if (!err && !REPLY_IS_PRELIM (reply))
err = unexpected_reply (conn, reply, txt, poss_errs);
if (err)
close (*data);
}
return err;
}
/* Wait for the reply signalling the end of a data transfer. */
error_t
ftp_conn_finish_transfer (struct ftp_conn *conn)
{
int reply;
error_t err = ftp_conn_get_reply (conn, &reply, 0);
if (!err && reply != REPLY_TRANS_OK && reply != REPLY_FCMD_OK)
err = unexpected_reply (conn, reply, 0, 0);
return err;
}
/* Start retreiving file NAME over CONN, returning a file descriptor in DATA
over which the data can be read. */
error_t
ftp_conn_start_retrieve (struct ftp_conn *conn, const char *name, int *data)
{
if (! name)
return EINVAL;
return
ftp_conn_start_transfer (conn, "retr", name, ftp_conn_poss_file_errs, data);
}
/* Start retreiving a list of files in NAME over CONN, returning a file
descriptor in DATA over which the data can be read. */
error_t
ftp_conn_start_list (struct ftp_conn *conn, const char *name, int *data)
{
return
ftp_conn_start_transfer (conn, "nlst", name, ftp_conn_poss_file_errs, data);
}
/* Start retreiving a directory listing of NAME over CONN, returning a file
descriptor in DATA over which the data can be read. */
error_t
ftp_conn_start_dir (struct ftp_conn *conn, const char *name, int *data)
{
return
ftp_conn_start_transfer (conn, "list", name, ftp_conn_poss_file_errs, data);
}
/* Start storing into file NAME over CONN, returning a file descriptor in DATA
into which the data can be written. */
error_t
ftp_conn_start_store (struct ftp_conn *conn, const char *name, int *data)
{
if (! name)
return EINVAL;
return
ftp_conn_start_transfer (conn, "stor", name, ftp_conn_poss_file_errs, data);
}
|
