2 * Copyright (C) 1997-2007 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_common.c common functions of para_client and para_audiod */
24 #include "client.cmdline.h"
30 #include "client.cmdline.h"
35 * rc4 encrypt data before sending
37 * \param len the number of bytes to encrypt
38 * \param indata pointer to the input data of length \a len to be encrypted
39 * \param outdata pointer that holds the encrypted data after return
40 * \param private_data pointer to the private client data containing
43 static void rc4_send(unsigned long len
, const unsigned char *indata
,
44 unsigned char *outdata
, void *private_data
)
46 struct private_client_data
*pcd
= private_data
;
47 RC4(&pcd
->rc4_send_key
, len
, indata
, outdata
);
51 * rc4 decrypt received data
53 * \param len the number of bytes to decrypt
54 * \param indata pointer to the input data of length \a len
55 * \param outdata pointer that holds the decrypted data after return
56 * \param private_data pointer to the private client data containing
59 static void rc4_recv(unsigned long len
, const unsigned char *indata
,
60 unsigned char *outdata
, void *private_data
)
62 struct private_client_data
*pcd
= private_data
;
63 RC4(&pcd
->rc4_recv_key
, len
, indata
, outdata
);
67 * close the connection to para_server and free all resources
69 * \param pcd pointer to the client data
73 void client_close(struct private_client_data
*pcd
)
78 disable_crypt(pcd
->fd
);
82 free(pcd
->config_file
);
87 static int client_connect(struct private_client_data
*pcd
)
91 struct sockaddr_in their_addr
;
94 ret
= get_host_info(pcd
->conf
.hostname_arg
, &he
);
102 /* init their_addr */
103 init_sockaddr(&their_addr
, pcd
->conf
.server_port_arg
, he
);
104 ret
= para_connect(pcd
->fd
, &their_addr
);
107 pcd
->status
= CL_CONNECTED
;
108 ret
= mark_fd_nonblock(pcd
->fd
);
111 pcd
->task
.pre_select
= client_pre_select
;
112 pcd
->task
.post_select
= client_post_select
;
113 pcd
->task
.private_data
= pcd
;
114 sprintf(pcd
->task
.status
, "client");
115 register_task(&pcd
->task
);
124 * open connection to para_server
126 * \param argc usual argument count
127 * \param argv usual argument vector
128 * \param pcd_ptr points to dynamically allocated and initialized private client data
129 * upon successful return
131 * Check the command line options given by \a argc and argv, set default values
132 * for user name and rsa key file, read further option from the config file.
133 * Finally, establish a connection to para_server.
135 * \return Positive on success, negative on errors.
137 int client_open(int argc
, char *argv
[], struct private_client_data
**pcd_ptr
)
139 char *home
= para_homedir();
142 struct private_client_data
*pcd
=
143 para_calloc(sizeof(struct private_client_data
));
147 ret
= client_cmdline_parser(argc
, argv
, &pcd
->conf
);
148 HANDLE_VERSION_FLAG("client", pcd
->conf
);
149 ret
= -E_CLIENT_SYNTAX
;
150 if (!pcd
->conf
.inputs_num
)
152 pcd
->user
= pcd
->conf
.user_given
?
153 para_strdup(pcd
->conf
.user_arg
) : para_logname();
155 pcd
->key_file
= pcd
->conf
.key_file_given
?
156 para_strdup(pcd
->conf
.key_file_arg
) :
157 make_message("%s/.paraslash/key.%s", home
, pcd
->user
);
159 pcd
->config_file
= pcd
->conf
.config_file_given
?
160 para_strdup(pcd
->conf
.config_file_arg
) :
161 make_message("%s/.paraslash/client.conf", home
);
162 ret
= stat(pcd
->config_file
, &statbuf
);
163 if (ret
&& pcd
->conf
.config_file_given
) {
168 client_cmdline_parser_configfile(pcd
->config_file
,
169 &pcd
->conf
, 0, 0, 0);
171 PARA_INFO_LOG("loglevel: %d\n", pcd
->conf
.loglevel_arg
);
172 PARA_INFO_LOG("config_file: %s\n", pcd
->config_file
);
173 PARA_INFO_LOG("key_file: %s\n", pcd
->key_file
);
174 PARA_NOTICE_LOG("connecting %s:%d\n", pcd
->conf
.hostname_arg
,
175 pcd
->conf
.server_port_arg
);
176 ret
= client_connect(pcd
);
180 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
188 * the preselect hook for server commands
190 * \param s pointer to the scheduler
191 * \param t pointer to the task struct for this command
193 * The task pointer must contain a pointer to the initialized client data
194 * structure as it is returned by client_open().
196 * This function checks the state of the connection and adds the file descriptor
197 * of the connection to the read or write fd set of \a s accordingly.
199 * \sa register_task() client_open(), struct sched, struct task
201 void client_pre_select(struct sched
*s
, struct task
*t
)
203 struct private_client_data
*pcd
= t
->private_data
;
210 switch (pcd
->status
) {
213 case CL_SENT_CH_RESPONSE
:
214 case CL_SENT_COMMAND
:
215 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
219 case CL_RECEIVED_WELCOME
:
220 case CL_RECEIVED_CHALLENGE
:
221 case CL_RECEIVED_PROCEED
:
222 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
227 if (pcd
->loaded
< CLIENT_BUFSIZE
- 1) {
228 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
233 if (*pcd
->in_loaded
) {
234 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
235 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
239 t
->ret
= -E_INPUT_EOF
;
240 s
->timeout
.tv_sec
= 0;
241 s
->timeout
.tv_usec
= 1;
248 static ssize_t
client_recv_buffer(struct private_client_data
*pcd
)
250 ssize_t ret
= recv_buffer(pcd
->fd
, pcd
->buf
+ pcd
->loaded
,
251 CLIENT_BUFSIZE
- pcd
->loaded
);
253 return -E_SERVER_EOF
;
261 * the post select hook for client commands
263 * \param s pointer to the scheduler
264 * \param t pointer to the task struct for this command
266 * Depending on the current state of the connection and the status of the read
267 * and write fd sets of \a s, this function performs the neccessary steps to
268 * authenticate the connection, to send the commmand given by \a
269 * t->private_data and to receive para_server's output, if any.
271 * \sa struct sched, struct task
273 void client_post_select(struct sched
*s
, struct task
*t
)
275 struct private_client_data
*pcd
= t
->private_data
;
277 // PARA_INFO_LOG("status %d\n", pcd->status);
281 if (!pcd
->check_r
&& !pcd
->check_w
)
283 if (pcd
->check_r
&& !FD_ISSET(pcd
->fd
, &s
->rfds
))
285 if (pcd
->check_w
&& !FD_ISSET(pcd
->fd
, &s
->wfds
))
287 switch (pcd
->status
) {
288 case CL_CONNECTED
: /* receive welcome message */
289 t
->ret
= client_recv_buffer(pcd
);
291 pcd
->status
= CL_RECEIVED_WELCOME
;
293 case CL_RECEIVED_WELCOME
: /* send auth command */
294 sprintf(pcd
->buf
, "auth %s%s", pcd
->conf
.plain_given
?
295 "" : "rc4 ", pcd
->user
);
296 PARA_INFO_LOG("--> %s\n", pcd
->buf
);
297 t
->ret
= send_buffer(pcd
->fd
, pcd
->buf
);
299 pcd
->status
= CL_SENT_AUTH
;
301 case CL_SENT_AUTH
: /* receive challenge number */
303 t
->ret
= client_recv_buffer(pcd
);
307 t
->ret
= -E_INVALID_CHALLENGE
;
308 PARA_ERROR_LOG("received the following: %s\n", pcd
->buf
);
311 PARA_INFO_LOG("%s", "<-- [challenge]\n");
312 /* decrypt challenge number */
313 t
->ret
= para_decrypt_challenge(pcd
->key_file
, &pcd
->challenge_nr
,
314 (unsigned char *) pcd
->buf
, 64);
316 pcd
->status
= CL_RECEIVED_CHALLENGE
;
318 case CL_RECEIVED_CHALLENGE
: /* send decrypted challenge */
319 PARA_INFO_LOG("--> %lu\n", pcd
->challenge_nr
);
320 t
->ret
= send_va_buffer(pcd
->fd
, "%s%lu", CHALLENGE_RESPONSE_MSG
,
323 pcd
->status
= CL_SENT_CH_RESPONSE
;
325 case CL_SENT_CH_RESPONSE
: /* read server response */
327 size_t bytes_received
;
328 unsigned char rc4_buf
[2 * RC4_KEY_LEN
] = "";
330 t
->ret
= client_recv_buffer(pcd
);
333 bytes_received
= t
->ret
;
334 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
335 "info ++++\n", pcd
->buf
);
336 /* check if server has sent "Proceed" message */
337 t
->ret
= -E_CLIENT_AUTH
;
338 if (!strstr(pcd
->buf
, PROCEED_MSG
))
341 pcd
->status
= CL_RECEIVED_PROCEED
;
342 if (bytes_received
< PROCEED_MSG_LEN
+ 32)
344 PARA_INFO_LOG("%s", "decrypting session key\n");
345 t
->ret
= para_decrypt_buffer(pcd
->key_file
, rc4_buf
,
346 (unsigned char *)pcd
->buf
+ PROCEED_MSG_LEN
+ 1,
347 bytes_received
- PROCEED_MSG_LEN
- 1);
350 RC4_set_key(&pcd
->rc4_send_key
, RC4_KEY_LEN
, rc4_buf
);
351 RC4_set_key(&pcd
->rc4_recv_key
, RC4_KEY_LEN
, rc4_buf
+ RC4_KEY_LEN
);
352 enable_crypt(pcd
->fd
, rc4_recv
, rc4_send
, pcd
);
354 case CL_RECEIVED_PROCEED
: /* concat args and send command */
357 char *command
= NULL
;
358 for (i
= 0; i
< pcd
->conf
.inputs_num
; i
++) {
360 command
= make_message("%s\n%s", command
?
361 command
: "", pcd
->conf
.inputs
[i
]);
364 command
= para_strcat(command
, EOC_MSG
"\n");
365 PARA_DEBUG_LOG("--> %s\n", command
);
366 t
->ret
= send_buffer(pcd
->fd
, command
);
369 pcd
->status
= CL_SENT_COMMAND
;
372 case CL_SENT_COMMAND
:
374 t
->ret
= client_recv_buffer(pcd
);
377 t
->ret
= -E_HANDSHAKE_COMPLETE
;
378 if (strstr(pcd
->buf
, AWAITING_DATA_MSG
))
379 pcd
->status
= CL_SENDING
;
381 pcd
->status
= CL_RECEIVING
;
383 case CL_SENDING
: /* FIXME: might block */
384 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
385 t
->ret
= send_bin_buffer(pcd
->fd
, pcd
->inbuf
, *pcd
->in_loaded
);
388 *pcd
->in_loaded
= 0; /* FIXME: short writes */
391 t
->ret
= client_recv_buffer(pcd
);