2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file client.c the client program used to connect to para_server */
23 #include "client.cmdline.h"
26 #include <openssl/rc4.h>
31 enum {CL_CONNECTED
, CL_SENT_AUTH
, CL_RECEIVED_CHALLENGE
, CL_SENT_CH_RESPONSE
,
32 CL_RECEIVED_PROCEED
, CL_SENT_COMMAND
, CL_SENDING_STDIN
, CL_RECV_DATA
};
34 struct private_client_data
{
37 struct client_args_info conf
;
52 static struct private_client_data
*pcd
;
54 static void rc4_send(unsigned long len
, const unsigned char *indata
,
55 unsigned char *outdata
)
57 RC4(&pcd
->rc4_send_key
, len
, indata
, outdata
);
60 static void rc4_recv(unsigned long len
, const unsigned char *indata
,
61 unsigned char *outdata
)
63 RC4(&pcd
->rc4_recv_key
, len
, indata
, outdata
);
70 void para_log(int ll
, const char* fmt
,...)
74 /* ignore log message if loglevel is not high enough */
75 if (pcd
&& ll
< pcd
->conf
.loglevel_arg
)
78 vfprintf(stderr
, fmt
, argp
);
82 static void client_close(struct private_client_data
*pcd
)
89 free(pcd
->config_file
);
94 static void append_str(char **data
, const char* append
)
97 char *tmp
= make_message("%s\n%s", *data
, append
);
101 *data
= para_strdup(append
);
104 static int client_parse_config(int argc
, char *argv
[],
105 struct private_client_data
**pcd_ptr
)
107 char *home
= para_homedir();
110 struct private_client_data
*p
=
111 para_calloc(sizeof(struct private_client_data
));
114 cmdline_parser(argc
, argv
, &p
->conf
);
115 ret
= - E_CLIENT_SYNTAX
;
116 if (!p
->conf
.inputs_num
)
118 p
->user
= p
->conf
.user_given
?
119 para_strdup(p
->conf
.user_arg
) : para_logname();
121 p
->key_file
= p
->conf
.key_file_given
?
122 para_strdup(p
->conf
.key_file_arg
) :
123 make_message("%s/.paraslash/key.%s", home
, p
->user
);
125 p
->config_file
= p
->conf
.config_file_given
?
126 para_strdup(p
->conf
.config_file_arg
) :
127 make_message("%s/.paraslash/client.conf", home
);
128 ret
= stat(p
->config_file
, &statbuf
);
129 if (ret
&& p
->conf
.config_file_given
) {
134 cmdline_parser_configfile(p
->config_file
, &p
->conf
, 0, 0, 0);
145 static int send_stdin(int fd
)
150 PARA_NOTICE_LOG("%s", "sending stdin\n");
152 ret
= read(STDIN_FILENO
, buf
, sizeof(buf
));
155 ret
= send_bin_buffer(fd
, buf
, ret
);
162 static int client_open(struct private_client_data
*pcd
)
166 struct sockaddr_in their_addr
;
168 /* get the host info */
169 PARA_NOTICE_LOG("getting host info of %s\n",
170 pcd
->conf
.hostname_arg
);
171 ret
= get_host_info(pcd
->conf
.hostname_arg
, &he
);
179 /* init their_addr */
180 init_sockaddr(&their_addr
, pcd
->conf
.server_port_arg
, he
);
182 PARA_NOTICE_LOG("connecting to %s\n", pcd
->conf
.hostname_arg
);
183 ret
= para_connect(pcd
->fd
, &their_addr
);
195 int main(int argc
, char *argv
[])
198 int numbytes
, i
, received
, ret
;
200 struct sockaddr_in their_addr
;
201 char *command
= NULL
;
204 long unsigned challenge_nr
;
205 unsigned char rc4_buf
[2 * RC4_KEY_LEN
] = "";
207 ret
= client_parse_config(argc
, argv
, &pcd
);
210 if (pcd
->conf
.loglevel_arg
<= NOTICE
)
211 cmdline_parser_print_version();
213 "current loglevel: %d\n"
214 "using config_file: %s\n"
215 "using key_file: %s\n"
216 "connecting to %s:%d\n",
217 pcd
->conf
.loglevel_arg
,
220 pcd
->conf
.hostname_arg
,
221 pcd
->conf
.server_port_arg
223 ret
= client_open(pcd
);
226 /* receive welcome message */
227 ret
= recv_buffer(pcd
->fd
, buf
, sizeof(buf
));
230 /* send auth command */
231 auth_str
= make_message("auth %s%s", pcd
->conf
.plain_given
? "" : "rc4 ",
233 PARA_INFO_LOG("<-- %s--> %s\n", buf
, auth_str
);
234 ret
= send_buffer(pcd
->fd
, auth_str
);
237 /* receive challenge number */
238 ret
= recv_buffer(pcd
->fd
, buf
, sizeof(buf
));
242 ret
= -E_INVALID_CHALLENGE
;
243 PARA_ERROR_LOG("received the following: %s\n", buf
);
246 PARA_INFO_LOG("%s", "<-- [challenge]\n");
247 /* decrypt challenge number */
248 ret
= para_decrypt_challenge(pcd
->key_file
, &challenge_nr
,
249 (unsigned char *) buf
, 64);
252 /* send decrypted challenge */
253 PARA_INFO_LOG("--> %lu\n", challenge_nr
);
254 ret
= send_va_buffer(pcd
->fd
, "%s%lu", CHALLENGE_RESPONSE_MSG
, challenge_nr
);
257 /* wait for approval */
258 PARA_NOTICE_LOG("%s", "waiting for approval from server\n");
259 ret
= recv_buffer(pcd
->fd
, buf
, sizeof(buf
));
263 PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
265 /* check if server has sent "Proceed" message */
266 ret
= -E_CLIENT_AUTH
;
267 if (!strstr(buf
, PROCEED_MSG
))
269 if (numbytes
>= PROCEED_MSG_LEN
+ 32) {
270 PARA_INFO_LOG("%s", "decrypting session key\n");
271 ret
= para_decrypt_buffer(pcd
->key_file
, rc4_buf
,
272 (unsigned char *)buf
+ PROCEED_MSG_LEN
+ 1,
273 numbytes
- PROCEED_MSG_LEN
- 1);
276 RC4_set_key(&pcd
->rc4_send_key
, RC4_KEY_LEN
, rc4_buf
);
277 RC4_set_key(&pcd
->rc4_recv_key
, RC4_KEY_LEN
, rc4_buf
+ RC4_KEY_LEN
);
278 PARA_INFO_LOG("rc4 encryption activated: %x:%x:%x:%x\n",
279 rc4_buf
[0], rc4_buf
[1], rc4_buf
[2], rc4_buf
[3]);
280 enable_crypt(pcd
->fd
, rc4_recv
, rc4_send
);
283 for (i
= 0; i
< pcd
->conf
.inputs_num
; i
++)
284 append_str(&command
, pcd
->conf
.inputs
[i
]);
286 PARA_INFO_LOG("--> %s\n", command
);
287 ret
= send_buffer(pcd
->fd
, command
);
292 ret
= send_buffer(pcd
->fd
, EOC_MSG
"\n");
295 PARA_NOTICE_LOG("%s", "command sent.\n");
298 ret
= recv_bin_buffer(pcd
->fd
, buf
, sizeof(buf
) - 1);
301 PARA_NOTICE_LOG("%s", "connection closed by peer\n");
306 if (!received
&& strstr(buf
, AWAITING_DATA_MSG
)) {
307 ret
= send_stdin(pcd
->fd
);
311 ret
= write(STDOUT_FILENO
, buf
, numbytes
);
312 if (ret
!= numbytes
) {
313 ret
= -E_SHORT_CLIENT_WRITE
;
320 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
321 return ret
>= 0? EXIT_SUCCESS
: EXIT_FAILURE
;