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 pointer that holds the encrypted data after return
31 * \param private_data pointer to the private client data containing
34 static void rc4_send(unsigned long len
, const unsigned char *indata
,
35 unsigned char *outdata
, void *private_data
)
37 struct private_client_data
*pcd
= private_data
;
38 RC4(&pcd
->rc4_send_key
, len
, indata
, outdata
);
42 * rc4 decrypt received data
44 * \param len the number of bytes to decrypt
45 * \param indata pointer to the input data of length \a len
46 * \param outdata pointer that holds the decrypted data after return
47 * \param private_data pointer to the private client data containing
50 static void rc4_recv(unsigned long len
, const unsigned char *indata
,
51 unsigned char *outdata
, void *private_data
)
53 struct private_client_data
*pcd
= private_data
;
54 RC4(&pcd
->rc4_recv_key
, len
, indata
, outdata
);
58 * close the connection to para_server and free all resources
60 * \param pcd pointer to the client data
64 void client_close(struct private_client_data
*pcd
)
69 disable_crypt(pcd
->fd
);
73 free(pcd
->config_file
);
75 client_cmdline_parser_free(&pcd
->conf
);
79 /* connect to para_server and register the client task */
80 static int client_connect(struct private_client_data
*pcd
)
85 ret
= makesock(AF_UNSPEC
, IPPROTO_TCP
, 0, pcd
->conf
.hostname_arg
,
86 pcd
->conf
.server_port_arg
);
90 pcd
->status
= CL_CONNECTED
;
91 ret
= mark_fd_nonblocking(pcd
->fd
);
94 pcd
->task
.pre_select
= client_pre_select
;
95 pcd
->task
.post_select
= client_post_select
;
96 pcd
->task
.private_data
= pcd
;
97 sprintf(pcd
->task
.status
, "client");
98 register_task(&pcd
->task
);
107 * open connection to para_server
109 * \param argc usual argument count
110 * \param argv usual argument vector
111 * \param pcd_ptr points to dynamically allocated and initialized private client data
112 * upon successful return
114 * Check the command line options given by \a argc and argv, set default values
115 * for user name and rsa key file, read further option from the config file.
116 * Finally, establish a connection to para_server.
118 * \return Positive on success, negative on errors.
120 int client_open(int argc
, char *argv
[], struct private_client_data
**pcd_ptr
)
122 char *home
= para_homedir();
125 struct private_client_data
*pcd
=
126 para_calloc(sizeof(struct private_client_data
));
130 ret
= client_cmdline_parser(argc
, argv
, &pcd
->conf
);
131 HANDLE_VERSION_FLAG("client", pcd
->conf
);
132 ret
= -E_CLIENT_SYNTAX
;
133 if (!pcd
->conf
.inputs_num
)
135 pcd
->user
= pcd
->conf
.user_given
?
136 para_strdup(pcd
->conf
.user_arg
) : para_logname();
138 pcd
->key_file
= pcd
->conf
.key_file_given
?
139 para_strdup(pcd
->conf
.key_file_arg
) :
140 make_message("%s/.paraslash/key.%s", home
, pcd
->user
);
142 pcd
->config_file
= pcd
->conf
.config_file_given
?
143 para_strdup(pcd
->conf
.config_file_arg
) :
144 make_message("%s/.paraslash/client.conf", home
);
145 ret
= stat(pcd
->config_file
, &statbuf
);
146 if (ret
&& pcd
->conf
.config_file_given
) {
151 struct client_cmdline_parser_params params
= {
157 client_cmdline_parser_config_file(pcd
->config_file
,
158 &pcd
->conf
, ¶ms
);
161 PARA_INFO_LOG("loglevel: %d\n", pcd
->conf
.loglevel_arg
);
162 PARA_INFO_LOG("config_file: %s\n", pcd
->config_file
);
163 PARA_INFO_LOG("key_file: %s\n", pcd
->key_file
);
164 PARA_NOTICE_LOG("connecting %s:%d\n", pcd
->conf
.hostname_arg
,
165 pcd
->conf
.server_port_arg
);
166 ret
= client_connect(pcd
);
170 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
178 * the preselect hook for server commands
180 * \param s pointer to the scheduler
181 * \param t pointer to the task struct for this command
183 * The task pointer must contain a pointer to the initialized client data
184 * structure as it is returned by client_open().
186 * This function checks the state of the connection and adds the file descriptor
187 * of the connection to the read or write fd set of \a s accordingly.
189 * \sa register_task() client_open(), struct sched, struct task
191 void client_pre_select(struct sched
*s
, struct task
*t
)
193 struct private_client_data
*pcd
= t
->private_data
;
200 switch (pcd
->status
) {
203 case CL_SENT_CH_RESPONSE
:
204 case CL_SENT_COMMAND
:
205 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
209 case CL_RECEIVED_WELCOME
:
210 case CL_RECEIVED_CHALLENGE
:
211 case CL_RECEIVED_PROCEED
:
212 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
217 if (pcd
->loaded
< CLIENT_BUFSIZE
- 1) {
218 para_fd_set(pcd
->fd
, &s
->rfds
, &s
->max_fileno
);
223 if (*pcd
->in_loaded
) {
224 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
225 para_fd_set(pcd
->fd
, &s
->wfds
, &s
->max_fileno
);
228 if (*pcd
->in_error
) {
229 t
->ret
= *pcd
->in_error
;
230 s
->timeout
.tv_sec
= 0;
231 s
->timeout
.tv_usec
= 1;
238 static ssize_t
client_recv_buffer(struct private_client_data
*pcd
)
240 ssize_t ret
= recv_buffer(pcd
->fd
, pcd
->buf
+ pcd
->loaded
,
241 CLIENT_BUFSIZE
- pcd
->loaded
);
243 return -E_SERVER_EOF
;
251 * the post select hook for client commands
253 * \param s pointer to the scheduler
254 * \param t pointer to the task struct for this command
256 * Depending on the current state of the connection and the status of the read
257 * and write fd sets of \a s, this function performs the necessary steps to
258 * authenticate the connection, to send the command given by \a
259 * t->private_data and to receive para_server's output, if any.
261 * \sa struct sched, struct task
263 void client_post_select(struct sched
*s
, struct task
*t
)
265 struct private_client_data
*pcd
= t
->private_data
;
267 // PARA_INFO_LOG("status %d\n", pcd->status);
271 if (!pcd
->check_r
&& !pcd
->check_w
)
273 if (pcd
->check_r
&& !FD_ISSET(pcd
->fd
, &s
->rfds
))
275 if (pcd
->check_w
&& !FD_ISSET(pcd
->fd
, &s
->wfds
))
277 switch (pcd
->status
) {
278 case CL_CONNECTED
: /* receive welcome message */
279 t
->ret
= client_recv_buffer(pcd
);
281 pcd
->status
= CL_RECEIVED_WELCOME
;
283 case CL_RECEIVED_WELCOME
: /* send auth command */
284 sprintf(pcd
->buf
, "auth %s%s", pcd
->conf
.plain_given
?
285 "" : "rc4 ", pcd
->user
);
286 PARA_INFO_LOG("--> %s\n", pcd
->buf
);
287 t
->ret
= send_buffer(pcd
->fd
, pcd
->buf
);
289 pcd
->status
= CL_SENT_AUTH
;
291 case CL_SENT_AUTH
: /* receive challenge number */
293 t
->ret
= client_recv_buffer(pcd
);
297 t
->ret
= -E_INVALID_CHALLENGE
;
298 PARA_ERROR_LOG("received the following: %s\n", pcd
->buf
);
301 PARA_INFO_LOG("%s", "<-- [challenge]\n");
302 /* decrypt challenge number */
303 t
->ret
= para_decrypt_challenge(pcd
->key_file
, &pcd
->challenge_nr
,
304 (unsigned char *) pcd
->buf
, 64);
306 pcd
->status
= CL_RECEIVED_CHALLENGE
;
308 case CL_RECEIVED_CHALLENGE
: /* send decrypted challenge */
309 PARA_INFO_LOG("--> %lu\n", pcd
->challenge_nr
);
310 t
->ret
= send_va_buffer(pcd
->fd
, "%s%lu", CHALLENGE_RESPONSE_MSG
,
313 pcd
->status
= CL_SENT_CH_RESPONSE
;
315 case CL_SENT_CH_RESPONSE
: /* read server response */
317 size_t bytes_received
;
318 unsigned char rc4_buf
[2 * RC4_KEY_LEN
] = "";
320 t
->ret
= client_recv_buffer(pcd
);
323 bytes_received
= t
->ret
;
324 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
325 "info ++++\n", pcd
->buf
);
326 /* check if server has sent "Proceed" message */
327 t
->ret
= -E_CLIENT_AUTH
;
328 if (!strstr(pcd
->buf
, PROCEED_MSG
))
331 pcd
->status
= CL_RECEIVED_PROCEED
;
332 if (bytes_received
< PROCEED_MSG_LEN
+ 32)
334 PARA_INFO_LOG("%s", "decrypting session key\n");
335 t
->ret
= para_decrypt_buffer(pcd
->key_file
, rc4_buf
,
336 (unsigned char *)pcd
->buf
+ PROCEED_MSG_LEN
+ 1,
337 bytes_received
- PROCEED_MSG_LEN
- 1);
340 RC4_set_key(&pcd
->rc4_send_key
, RC4_KEY_LEN
, rc4_buf
);
341 RC4_set_key(&pcd
->rc4_recv_key
, RC4_KEY_LEN
, rc4_buf
+ RC4_KEY_LEN
);
342 enable_crypt(pcd
->fd
, rc4_recv
, rc4_send
, pcd
);
344 case CL_RECEIVED_PROCEED
: /* concat args and send command */
347 char *command
= NULL
;
348 for (i
= 0; i
< pcd
->conf
.inputs_num
; i
++) {
350 command
= make_message("%s\n%s", command
?
351 command
: "", pcd
->conf
.inputs
[i
]);
354 command
= para_strcat(command
, EOC_MSG
"\n");
355 PARA_DEBUG_LOG("--> %s\n", command
);
356 t
->ret
= send_buffer(pcd
->fd
, command
);
359 pcd
->status
= CL_SENT_COMMAND
;
362 case CL_SENT_COMMAND
:
364 t
->ret
= client_recv_buffer(pcd
);
367 t
->ret
= -E_HANDSHAKE_COMPLETE
;
368 if (strstr(pcd
->buf
, AWAITING_DATA_MSG
))
369 pcd
->status
= CL_SENDING
;
371 pcd
->status
= CL_RECEIVING
;
373 case CL_SENDING
: /* FIXME: might block */
374 PARA_INFO_LOG("loaded: %zd\n", *pcd
->in_loaded
);
375 t
->ret
= send_bin_buffer(pcd
->fd
, pcd
->inbuf
, *pcd
->in_loaded
);
381 t
->ret
= client_recv_buffer(pcd
);