2 * Copyright (C) 1997-2007 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 private_client_data
*pcd
= private_data
;
37 RC4(&pcd
->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 private_client_data
*pcd
= private_data
;
49 RC4(&pcd
->rc4_recv_key
, len
, indata
, outdata
);
53 * Close the connection to para_server and free all resources.
55 * \param pcd Pointer to the client data.
59 void client_close(struct private_client_data
*pcd
)
64 disable_crypt(pcd
->fd
);
68 free(pcd
->config_file
);
70 client_cmdline_parser_free(&pcd
->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 private_client_data
*pcd
= t
->private_data
;
97 switch (pcd
->status
) {
100 case CL_SENT_CH_RESPONSE
:
101 case CL_SENT_COMMAND
:
102 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
106 case CL_RECEIVED_WELCOME
:
107 case CL_RECEIVED_CHALLENGE
:
108 case CL_RECEIVED_PROCEED
:
109 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
114 if (pcd
->loaded
< CLIENT_BUFSIZE
- 1) {
115 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
120 if (*pcd
->in_loaded
) {
121 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
122 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
125 if (*pcd
->in_error
) {
126 t
->ret
= *pcd
->in_error
;
127 s
->timeout
.tv_sec
= 0;
128 s
->timeout
.tv_usec
= 1;
135 static ssize_t
client_recv_buffer(struct private_client_data
*pcd
)
137 ssize_t ret
= recv_buffer(pcd
->fd
, pcd
->buf
+ pcd
->loaded
,
138 CLIENT_BUFSIZE
- pcd
->loaded
);
140 return -E_SERVER_EOF
;
148 * The post select hook for client commands.
150 * \param s Pointer to the scheduler.
151 * \param t Pointer to the task struct for this command.
153 * Depending on the current state of the connection and the status of the read
154 * and write fd sets of \a s, this function performs the necessary steps to
155 * authenticate the connection, to send the command given by \a t->private_data
156 * and to receive para_server's output, if any.
158 * \sa struct sched, struct task.
160 static void client_post_select(struct sched
*s
, struct task
*t
)
162 struct private_client_data
*pcd
= t
->private_data
;
164 // PARA_INFO_LOG("status %d\n", pcd->status);
168 if (!pcd
->check_r
&& !pcd
->check_w
)
170 if (pcd
->check_r
&& !FD_ISSET(pcd
->fd
, &s
->rfds
))
172 if (pcd
->check_w
&& !FD_ISSET(pcd
->fd
, &s
->wfds
))
174 switch (pcd
->status
) {
175 case CL_CONNECTED
: /* receive welcome message */
176 t
->ret
= client_recv_buffer(pcd
);
178 pcd
->status
= CL_RECEIVED_WELCOME
;
180 case CL_RECEIVED_WELCOME
: /* send auth command */
181 sprintf(pcd
->buf
, "auth %s%s", pcd
->conf
.plain_given
?
182 "" : "rc4 ", pcd
->user
);
183 PARA_INFO_LOG("--> %s\n", pcd
->buf
);
184 t
->ret
= send_buffer(pcd
->fd
, pcd
->buf
);
186 pcd
->status
= CL_SENT_AUTH
;
188 case CL_SENT_AUTH
: /* receive challenge number */
190 t
->ret
= client_recv_buffer(pcd
);
194 t
->ret
= -E_INVALID_CHALLENGE
;
195 PARA_ERROR_LOG("received the following: %s\n", pcd
->buf
);
198 PARA_INFO_LOG("%s", "<-- [challenge]\n");
199 /* decrypt challenge number */
200 t
->ret
= para_decrypt_challenge(pcd
->key_file
, &pcd
->challenge_nr
,
201 (unsigned char *) pcd
->buf
, 64);
203 pcd
->status
= CL_RECEIVED_CHALLENGE
;
205 case CL_RECEIVED_CHALLENGE
: /* send decrypted challenge */
206 PARA_INFO_LOG("--> %lu\n", pcd
->challenge_nr
);
207 t
->ret
= send_va_buffer(pcd
->fd
, "%s%lu", CHALLENGE_RESPONSE_MSG
,
210 pcd
->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
->ret
= client_recv_buffer(pcd
);
220 bytes_received
= t
->ret
;
221 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
222 "info ++++\n", pcd
->buf
);
223 /* check if server has sent "Proceed" message */
224 t
->ret
= -E_CLIENT_AUTH
;
225 if (!strstr(pcd
->buf
, PROCEED_MSG
))
228 pcd
->status
= CL_RECEIVED_PROCEED
;
229 if (bytes_received
< PROCEED_MSG_LEN
+ 32)
231 PARA_INFO_LOG("%s", "decrypting session key\n");
232 t
->ret
= para_decrypt_buffer(pcd
->key_file
, rc4_buf
,
233 (unsigned char *)pcd
->buf
+ PROCEED_MSG_LEN
+ 1,
234 bytes_received
- PROCEED_MSG_LEN
- 1);
237 RC4_set_key(&pcd
->rc4_send_key
, RC4_KEY_LEN
, rc4_buf
);
238 RC4_set_key(&pcd
->rc4_recv_key
, RC4_KEY_LEN
, rc4_buf
+ RC4_KEY_LEN
);
239 enable_crypt(pcd
->fd
, rc4_recv
, rc4_send
, pcd
);
241 case CL_RECEIVED_PROCEED
: /* concat args and send command */
244 char *command
= NULL
;
245 for (i
= 0; i
< pcd
->conf
.inputs_num
; i
++) {
247 command
= make_message("%s\n%s", command
?
248 command
: "", pcd
->conf
.inputs
[i
]);
251 command
= para_strcat(command
, EOC_MSG
"\n");
252 PARA_DEBUG_LOG("--> %s\n", command
);
253 t
->ret
= send_buffer(pcd
->fd
, command
);
256 pcd
->status
= CL_SENT_COMMAND
;
259 case CL_SENT_COMMAND
:
261 t
->ret
= client_recv_buffer(pcd
);
264 t
->ret
= -E_HANDSHAKE_COMPLETE
;
265 if (strstr(pcd
->buf
, AWAITING_DATA_MSG
))
266 pcd
->status
= CL_SENDING
;
268 pcd
->status
= CL_RECEIVING
;
270 case CL_SENDING
: /* FIXME: might block */
271 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
272 t
->ret
= send_bin_buffer(pcd
->fd
, pcd
->inbuf
, *pcd
->in_loaded
);
278 t
->ret
= client_recv_buffer(pcd
);
283 /* connect to para_server and register the client task */
284 static int client_connect(struct private_client_data
*pcd
)
289 ret
= makesock(AF_UNSPEC
, IPPROTO_TCP
, 0, pcd
->conf
.hostname_arg
,
290 pcd
->conf
.server_port_arg
);
294 pcd
->status
= CL_CONNECTED
;
295 ret
= mark_fd_nonblocking(pcd
->fd
);
298 pcd
->task
.pre_select
= client_pre_select
;
299 pcd
->task
.post_select
= client_post_select
;
300 pcd
->task
.private_data
= pcd
;
301 sprintf(pcd
->task
.status
, "client");
302 register_task(&pcd
->task
);
311 * Open connection to para_server.
313 * \param argc Usual argument count.
314 * \param argv Usual argument vector.
315 * \param pcd_ptr Points to dynamically allocated and initialized private client data
316 * upon successful return.
318 * Check the command line options given by \a argc and argv, set default values
319 * for user name and rsa key file, read further option from the config file.
320 * Finally, establish a connection to para_server.
324 int client_open(int argc
, char *argv
[], struct private_client_data
**pcd_ptr
)
326 char *home
= para_homedir();
329 struct private_client_data
*pcd
=
330 para_calloc(sizeof(struct private_client_data
));
334 ret
= client_cmdline_parser(argc
, argv
, &pcd
->conf
);
335 HANDLE_VERSION_FLAG("client", pcd
->conf
);
336 ret
= -E_CLIENT_SYNTAX
;
337 if (!pcd
->conf
.inputs_num
)
339 pcd
->user
= pcd
->conf
.user_given
?
340 para_strdup(pcd
->conf
.user_arg
) : para_logname();
342 pcd
->key_file
= pcd
->conf
.key_file_given
?
343 para_strdup(pcd
->conf
.key_file_arg
) :
344 make_message("%s/.paraslash/key.%s", home
, pcd
->user
);
346 pcd
->config_file
= pcd
->conf
.config_file_given
?
347 para_strdup(pcd
->conf
.config_file_arg
) :
348 make_message("%s/.paraslash/client.conf", home
);
349 ret
= stat(pcd
->config_file
, &statbuf
);
350 if (ret
&& pcd
->conf
.config_file_given
) {
355 struct client_cmdline_parser_params params
= {
361 client_cmdline_parser_config_file(pcd
->config_file
,
362 &pcd
->conf
, ¶ms
);
365 PARA_INFO_LOG("loglevel: %d\n", pcd
->conf
.loglevel_arg
);
366 PARA_INFO_LOG("config_file: %s\n", pcd
->config_file
);
367 PARA_INFO_LOG("key_file: %s\n", pcd
->key_file
);
368 PARA_NOTICE_LOG("connecting %s:%d\n", pcd
->conf
.hostname_arg
,
369 pcd
->conf
.server_port_arg
);
370 ret
= client_connect(pcd
);
374 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));