2 * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file client_common.c Common functions of para_client and para_audiod. */
16 #include "client.cmdline.h"
22 #include "client.cmdline.h"
26 * Rc4-encrypt data before sending.
28 * \param len The number of bytes to encrypt.
29 * \param indata Pointer to the input data of length \a len to be encrypted.
30 * \param outdata Result-pointer that holds the encrypted data.
31 * \param private_data Contains the rc4 key.
33 static void rc4_send(unsigned long len
, const unsigned char *indata
,
34 unsigned char *outdata
, void *private_data
)
36 struct client_task
*ct
= private_data
;
37 RC4(&ct
->rc4_send_key
, len
, indata
, outdata
);
41 * Rc4-decrypt received data.
43 * Parameters are identical to those of rc4_send.
45 static void rc4_recv(unsigned long len
, const unsigned char *indata
,
46 unsigned char *outdata
, void *private_data
)
48 struct client_task
*ct
= private_data
;
49 RC4(&ct
->rc4_recv_key
, len
, indata
, outdata
);
53 * Close the connection to para_server and free all resources.
55 * \param ct Pointer to the client data.
59 void client_close(struct client_task
*ct
)
64 disable_crypt(ct
->fd
);
68 free(ct
->config_file
);
70 client_cmdline_parser_free(&ct
->conf
);
75 * The preselect hook for server commands.
77 * \param s Pointer to the scheduler.
78 * \param t Pointer to the task struct for this command.
80 * The task pointer must contain a pointer to the initialized client data
81 * structure as it is returned by client_open().
83 * This function checks the state of the connection and adds the file descriptor
84 * of the connection to the read or write fd set of \a s accordingly.
86 * \sa register_task() client_open(), struct sched, struct task.
88 static void client_pre_select(struct sched
*s
, struct task
*t
)
90 struct client_task
*ct
= container_of(t
, struct client_task
, task
);
99 case CL_SENT_CH_RESPONSE
:
100 case CL_SENT_COMMAND
:
101 para_fd_set(ct
->fd
, &s
->rfds
, &s
->max_fileno
);
105 case CL_RECEIVED_WELCOME
:
106 case CL_RECEIVED_CHALLENGE
:
107 case CL_RECEIVED_PROCEED
:
108 para_fd_set(ct
->fd
, &s
->wfds
, &s
->max_fileno
);
113 if (ct
->loaded
< CLIENT_BUFSIZE
- 1) {
114 para_fd_set(ct
->fd
, &s
->rfds
, &s
->max_fileno
);
119 if (!ct
->in_loaded
) /* stdin task not yet started */
121 if (*ct
->in_loaded
) {
122 PARA_INFO_LOG("loaded: %zd\n", *ct
->in_loaded
);
123 para_fd_set(ct
->fd
, &s
->wfds
, &s
->max_fileno
);
127 t
->error
= *ct
->in_error
;
128 s
->timeout
.tv_sec
= 0;
129 s
->timeout
.tv_usec
= 1;
136 static ssize_t
client_recv_buffer(struct client_task
*ct
)
138 ssize_t ret
= recv_buffer(ct
->fd
, ct
->buf
+ ct
->loaded
,
139 CLIENT_BUFSIZE
- ct
->loaded
);
141 return -E_SERVER_EOF
;
149 * The post select hook for client commands.
151 * \param s Pointer to the scheduler.
152 * \param t Pointer to the task struct for this command.
154 * Depending on the current state of the connection and the status of the read
155 * and write fd sets of \a s, this function performs the necessary steps to
156 * authenticate the connection, to send the command given by \a t->private_data
157 * and to receive para_server's output, if any.
159 * \sa struct sched, struct task.
161 static void client_post_select(struct sched
*s
, struct task
*t
)
163 struct client_task
*ct
= container_of(t
, struct client_task
, task
);
168 if (!ct
->check_r
&& !ct
->check_w
)
170 if (ct
->check_r
&& !FD_ISSET(ct
->fd
, &s
->rfds
))
172 if (ct
->check_w
&& !FD_ISSET(ct
->fd
, &s
->wfds
))
174 switch (ct
->status
) {
175 case CL_CONNECTED
: /* receive welcome message */
176 t
->error
= client_recv_buffer(ct
);
178 ct
->status
= CL_RECEIVED_WELCOME
;
180 case CL_RECEIVED_WELCOME
: /* send auth command */
181 sprintf(ct
->buf
, "auth %s%s", ct
->conf
.plain_given
?
182 "" : "rc4 ", ct
->user
);
183 PARA_INFO_LOG("--> %s\n", ct
->buf
);
184 t
->error
= send_buffer(ct
->fd
, ct
->buf
);
186 ct
->status
= CL_SENT_AUTH
;
188 case CL_SENT_AUTH
: /* receive challenge number */
190 t
->error
= client_recv_buffer(ct
);
193 if (t
->error
!= 64) {
194 t
->error
= -E_INVALID_CHALLENGE
;
195 PARA_ERROR_LOG("received the following: %s\n", ct
->buf
);
198 PARA_INFO_LOG("<-- [challenge]\n");
199 /* decrypt challenge number */
200 t
->error
= para_decrypt_challenge(ct
->key_file
, &ct
->challenge_nr
,
201 (unsigned char *) ct
->buf
, 64);
203 ct
->status
= CL_RECEIVED_CHALLENGE
;
205 case CL_RECEIVED_CHALLENGE
: /* send decrypted challenge */
206 PARA_INFO_LOG("--> %lu\n", ct
->challenge_nr
);
207 t
->error
= send_va_buffer(ct
->fd
, "%s%lu", CHALLENGE_RESPONSE_MSG
,
210 ct
->status
= CL_SENT_CH_RESPONSE
;
212 case CL_SENT_CH_RESPONSE
: /* read server response */
214 size_t bytes_received
;
215 unsigned char rc4_buf
[2 * RC4_KEY_LEN
] = "";
217 t
->error
= client_recv_buffer(ct
);
220 bytes_received
= t
->error
;
221 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
222 "info ++++\n", ct
->buf
);
223 /* check if server has sent "Proceed" message */
224 t
->error
= -E_CLIENT_AUTH
;
225 if (!strstr(ct
->buf
, PROCEED_MSG
))
228 ct
->status
= CL_RECEIVED_PROCEED
;
229 if (bytes_received
< PROCEED_MSG_LEN
+ 32)
231 PARA_INFO_LOG("decrypting session key\n");
232 t
->error
= para_decrypt_buffer(ct
->key_file
, rc4_buf
,
233 (unsigned char *)ct
->buf
+ PROCEED_MSG_LEN
+ 1,
234 bytes_received
- PROCEED_MSG_LEN
- 1);
237 RC4_set_key(&ct
->rc4_send_key
, RC4_KEY_LEN
, rc4_buf
);
238 RC4_set_key(&ct
->rc4_recv_key
, RC4_KEY_LEN
, rc4_buf
+ RC4_KEY_LEN
);
239 enable_crypt(ct
->fd
, rc4_recv
, rc4_send
, ct
);
241 case CL_RECEIVED_PROCEED
: /* concat args and send command */
244 char *command
= NULL
;
245 for (i
= 0; i
< ct
->conf
.inputs_num
; i
++) {
247 command
= make_message("%s\n%s", command
?
248 command
: "", ct
->conf
.inputs
[i
]);
251 command
= para_strcat(command
, EOC_MSG
"\n");
252 PARA_DEBUG_LOG("--> %s\n", command
);
253 t
->error
= send_buffer(ct
->fd
, command
);
256 ct
->status
= CL_SENT_COMMAND
;
259 case CL_SENT_COMMAND
:
261 t
->error
= client_recv_buffer(ct
);
264 if (strstr(ct
->buf
, AWAITING_DATA_MSG
))
265 ct
->status
= CL_SENDING
;
267 ct
->status
= CL_RECEIVING
;
269 case CL_SENDING
: /* FIXME: might block */
270 PARA_INFO_LOG("loaded: %zd\n", *ct
->in_loaded
);
271 t
->error
= send_bin_buffer(ct
->fd
, ct
->inbuf
, *ct
->in_loaded
);
277 t
->error
= client_recv_buffer(ct
);
282 /* connect to para_server and register the client task */
283 static int client_connect(struct client_task
*ct
)
288 ret
= makesock(AF_UNSPEC
, IPPROTO_TCP
, 0, ct
->conf
.hostname_arg
,
289 ct
->conf
.server_port_arg
);
293 ct
->status
= CL_CONNECTED
;
294 ret
= mark_fd_nonblocking(ct
->fd
);
297 ct
->task
.pre_select
= client_pre_select
;
298 ct
->task
.post_select
= client_post_select
;
299 sprintf(ct
->task
.status
, "client");
300 register_task(&ct
->task
);
309 * Open connection to para_server.
311 * \param argc Usual argument count.
312 * \param argv Usual argument vector.
313 * \param ct_ptr Points to dynamically allocated and initialized client task
314 * struct upon successful return.
316 * Check the command line options given by \a argc and argv, set default values
317 * for user name and rsa key file, read further option from the config file.
318 * Finally, establish a connection to para_server.
322 int client_open(int argc
, char *argv
[], struct client_task
**ct_ptr
,
325 char *home
= para_homedir();
328 struct client_task
*ct
= para_calloc(sizeof(struct client_task
));
332 ret
= -E_CLIENT_SYNTAX
;
333 if (client_cmdline_parser(argc
, argv
, &ct
->conf
))
335 HANDLE_VERSION_FLAG("client", ct
->conf
);
336 ret
= -E_CLIENT_SYNTAX
;
337 if (!ct
->conf
.inputs_num
)
339 ct
->user
= ct
->conf
.user_given
?
340 para_strdup(ct
->conf
.user_arg
) : para_logname();
342 ct
->key_file
= ct
->conf
.key_file_given
?
343 para_strdup(ct
->conf
.key_file_arg
) :
344 make_message("%s/.paraslash/key.%s", home
, ct
->user
);
346 ct
->config_file
= ct
->conf
.config_file_given
?
347 para_strdup(ct
->conf
.config_file_arg
) :
348 make_message("%s/.paraslash/client.conf", home
);
349 ret
= stat(ct
->config_file
, &statbuf
);
350 if (ret
&& ct
->conf
.config_file_given
) {
355 struct client_cmdline_parser_params params
= {
359 .check_ambiguity
= 0,
363 if (client_cmdline_parser_config_file(ct
->config_file
,
368 *loglevel
= get_loglevel_by_name(ct
->conf
.loglevel_arg
);
369 PARA_INFO_LOG("loglevel: %s\n", ct
->conf
.loglevel_arg
);
370 PARA_INFO_LOG("config_file: %s\n", ct
->config_file
);
371 PARA_INFO_LOG("key_file: %s\n", ct
->key_file
);
372 PARA_NOTICE_LOG("connecting %s:%d\n", ct
->conf
.hostname_arg
,
373 ct
->conf
.server_port_arg
);
374 ret
= client_connect(ct
);
378 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));