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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/* Send commands to the ftp server
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 <string.h>
#include <arpa/telnet.h>
#include <ftpconn.h>
#include "priv.h"
/* Version of write that writes all LEN bytes of BUF if possible to FD. */
static error_t
_write (int fd, const void *buf, size_t len)
{
while (len > 0)
{
ssize_t wr = write (fd, buf, len);
if (wr < 0)
return errno;
else if (wr == 0)
return EPIPE;
buf += wr;
len -= wr;
}
return 0;
}
static error_t
_skip_write (int fd, const void *buf, size_t len, size_t *skip)
{
size_t sk = *skip;
error_t err = 0;
if (len > sk)
{
err = _write (fd, buf + sk, len - sk);
*skip = 0;
}
else
*skip = sk - len;
return err;
}
/* Ridiculous function to deal with the never-to-occur case of the ftp
command being too long for the buffer in ftp_conn_cmd; just writes the
portion of the command that wasn't written there. */
static error_t
_long_cmd (int fd, const char *cmd, const char *arg, size_t skip)
{
error_t err = _skip_write (fd, cmd, strlen (cmd), &skip);
if (!err && arg)
{
err = _skip_write (fd, " ", 1, &skip);
if (! err)
err = _skip_write (fd, arg, strlen (arg), &skip);
}
if (! err)
err = _skip_write (fd, "\r\n", 2, &skip);
return err;
}
/* Send the ftp command CMD, with optional argument ARG (if non-zero) to
CONN's ftp server. If either of REPLY or REPLY_TXT is non-zero, then a
reply is waited for and returned as with ftp_conn_get_reply, otherwise
the next reply from the server is left unconsumed. */
error_t
ftp_conn_cmd (struct ftp_conn *conn, const char *cmd, const char *arg,
int *reply, const char **reply_txt)
{
error_t err = 0;
if (conn->control < 0)
err = EPIPE;
else
/* (This used to try to call dprintf to output to conn->control, but that
function doesn't appear to work.) */
{
char buf[200];
size_t out =
snprintf (buf, sizeof buf, arg ? "%s %s\r\n" : "%s\r\n", cmd, arg);
err = _write (conn->control, buf, out);
if (!err && conn->hooks && conn->hooks->cntl_debug)
{
buf[out - 2] = '\0'; /* Stomp the CR & NL. */
(* conn->hooks->cntl_debug) (conn, FTP_CONN_CNTL_DEBUG_CMD, buf);
}
if (!err && out == sizeof buf)
err = _long_cmd (conn->control, cmd, arg, sizeof buf);
}
if (!err && (reply || reply_txt))
err = ftp_conn_get_reply (conn, reply, reply_txt);
return err;
}
/* Send an ftp command to CONN's server, and optionally await a reply as with
ftp_conn_cmd, but also open a new connection if it appears that the old
one has died (as when the ftp server times it out). */
error_t
ftp_conn_cmd_reopen (struct ftp_conn *conn, const char *cmd, const char *arg,
int *reply, const char **reply_txt)
{
int _reply;
error_t err;
err = ftp_conn_cmd (conn, cmd, arg, &_reply, reply_txt);
if (err == EPIPE || (!err && _reply == REPLY_CLOSED))
/* Retry once after reopening the connection. */
{
err = ftp_conn_open (conn);
if (! err)
err = ftp_conn_cmd (conn, cmd, arg, reply, reply_txt);
}
else if (reply)
*reply = _reply;
return err;
}
/* Send an ftp ABOR command to CONN's server, aborting any transfer in
progress. */
void
ftp_conn_abort (struct ftp_conn *conn)
{
if (conn->control >= 0)
{
static const char ip[] = { IAC, IP, IAC };
static const char abor[] = { DM, 'a', 'b', 'o', 'r', '\r', '\n' };
if (conn->hooks && conn->hooks->cntl_debug)
(* conn->hooks->cntl_debug) (conn, FTP_CONN_CNTL_DEBUG_CMD, "abor");
if (send (conn->control, ip, sizeof ip, MSG_OOB) == sizeof ip
&& write (conn->control, abor, sizeof abor) == sizeof abor)
{
int reply;
do
ftp_conn_get_raw_reply (conn, &reply, 0);
while (reply == REPLY_ABORTED);
if (reply != REPLY_TRANS_OK && reply != REPLY_ABORT_OK)
ftp_conn_close (conn);
}
else
ftp_conn_close (conn);
}
}
|
