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. */
10 #include <sys/types.h>
12 #include <openssl/rc4.h>
18 #include "client.cmdline.h"
24 #include "client.cmdline.h"
27 #include "buffer_tree.h"
29 /** The size of the receiving buffer. */
30 #define CLIENT_BUFSIZE 4000
33 * Close the connection to para_server and free all resources.
35 * \param ct Pointer to the client data.
39 void client_close(struct client_task
*ct
)
46 free(ct
->config_file
);
48 client_cmdline_parser_free(&ct
->conf
);
53 * The preselect hook for server commands.
55 * \param s Pointer to the scheduler.
56 * \param t Pointer to the task struct for this command.
58 * The task pointer must contain a pointer to the initialized client data
59 * structure as it is returned by client_open().
61 * This function checks the state of the connection and adds the file descriptor
62 * of the connection to the read or write fd set of \a s accordingly.
64 * \sa register_task() client_open(), struct sched, struct task.
66 static void client_pre_select(struct sched
*s
, struct task
*t
)
69 struct client_task
*ct
= container_of(t
, struct client_task
, task
);
70 struct btr_node
*btrn
= ct
->btrn
;
77 case CL_SENT_CH_RESPONSE
:
79 para_fd_set(ct
->rc4c
.fd
, &s
->rfds
, &s
->max_fileno
);
82 case CL_RECEIVED_WELCOME
:
83 case CL_RECEIVED_PROCEED
:
84 para_fd_set(ct
->rc4c
.fd
, &s
->wfds
, &s
->max_fileno
);
88 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
93 para_fd_set(ct
->rc4c
.fd
, &s
->rfds
,
98 ret
= btr_node_status(btrn
, 0, BTR_NT_LEAF
);
103 para_fd_set(ct
->rc4c
.fd
, &s
->wfds
,
110 static ssize_t
client_recv_buffer(struct client_task
*ct
, char *buf
, size_t len
)
114 if (ct
->status
< CL_SENT_CH_RESPONSE
)
115 ret
= recv_buffer(ct
->rc4c
.fd
, buf
, len
);
117 ret
= rc4_recv_buffer(&ct
->rc4c
, buf
, len
);
119 return -E_SERVER_EOF
;
124 * The post select hook for client commands.
126 * \param s Pointer to the scheduler.
127 * \param t Pointer to the task struct for this command.
129 * Depending on the current state of the connection and the status of the read
130 * and write fd sets of \a s, this function performs the necessary steps to
131 * authenticate the connection, to send the command given by \a t->private_data
132 * and to receive para_server's output, if any.
134 * \sa struct sched, struct task.
136 static void client_post_select(struct sched
*s
, struct task
*t
)
138 struct client_task
*ct
= container_of(t
, struct client_task
, task
);
139 struct btr_node
*btrn
= ct
->btrn
;
141 char buf
[CLIENT_BUFSIZE
];
146 switch (ct
->status
) {
147 case CL_CONNECTED
: /* receive welcome message */
148 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->rfds
))
150 ret
= client_recv_buffer(ct
, buf
, sizeof(buf
));
153 ct
->status
= CL_RECEIVED_WELCOME
;
155 case CL_RECEIVED_WELCOME
: /* send auth command */
156 sprintf(buf
, AUTH_REQUEST_MSG
"%s", ct
->user
);
157 PARA_INFO_LOG("--> %s\n", buf
);
158 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->wfds
))
160 ret
= send_buffer(ct
->rc4c
.fd
, buf
);
163 ct
->status
= CL_SENT_AUTH
;
167 * Receive challenge and rc4 keys, decrypt the challenge and
168 * send back the hash of the decrypted challenge.
171 /* decrypted challenge/rc4 buffer */
172 unsigned char crypt_buf
[1024];
173 /* the SHA1 of the decrypted challenge */
174 unsigned char challenge_sha1
[HASH_SIZE
];
176 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->rfds
))
178 ret
= client_recv_buffer(ct
, buf
, sizeof(buf
));
181 PARA_INFO_LOG("<-- [challenge] (%d bytes)\n", ret
);
182 ret
= para_decrypt_buffer(ct
->key_file
, crypt_buf
,
183 (unsigned char *)buf
, ret
);
186 sha1_hash((char *)crypt_buf
, CHALLENGE_SIZE
, challenge_sha1
);
187 RC4_set_key(&ct
->rc4c
.send_key
, RC4_KEY_LEN
,
188 crypt_buf
+ CHALLENGE_SIZE
);
189 RC4_set_key(&ct
->rc4c
.recv_key
, RC4_KEY_LEN
,
190 crypt_buf
+ CHALLENGE_SIZE
+ RC4_KEY_LEN
);
191 hash_to_asc(challenge_sha1
, buf
);
192 PARA_INFO_LOG("--> %s\n", buf
);
193 ret
= send_bin_buffer(ct
->rc4c
.fd
, (char *)challenge_sha1
,
197 ct
->status
= CL_SENT_CH_RESPONSE
;
200 case CL_SENT_CH_RESPONSE
: /* read server response */
202 size_t bytes_received
;
203 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->rfds
))
205 ret
= client_recv_buffer(ct
, buf
, sizeof(buf
));
208 bytes_received
= ret
;
209 /* check if server has sent "Proceed" message */
210 ret
= -E_CLIENT_AUTH
;
211 if (bytes_received
< PROCEED_MSG_LEN
)
213 if (!strstr(buf
, PROCEED_MSG
))
215 ct
->status
= CL_RECEIVED_PROCEED
;
218 case CL_RECEIVED_PROCEED
: /* concat args and send command */
221 char *command
= NULL
;
222 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->wfds
))
224 for (i
= 0; i
< ct
->conf
.inputs_num
; i
++) {
226 command
= make_message("%s\n%s", command
?
227 command
: "", ct
->conf
.inputs
[i
]);
230 command
= para_strcat(command
, EOC_MSG
"\n");
231 PARA_DEBUG_LOG("--> %s\n", command
);
232 ret
= rc4_send_buffer(&ct
->rc4c
, command
);
236 ct
->status
= CL_SENT_COMMAND
;
239 case CL_SENT_COMMAND
:
242 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->rfds
))
244 /* can not use "buf" here because we need a malloced buffer */
245 buf2
= para_malloc(CLIENT_BUFSIZE
);
246 ret
= client_recv_buffer(ct
, buf2
, CLIENT_BUFSIZE
);
251 if (strstr(buf2
, AWAITING_DATA_MSG
)) {
253 ct
->status
= CL_SENDING
;
256 ct
->status
= CL_RECEIVING
;
257 btr_add_output(buf2
, ret
, btrn
);
264 ret
= btr_node_status(btrn
, 0, BTR_NT_LEAF
);
269 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->wfds
))
271 sz
= btr_next_buffer(btrn
, &buf2
);
272 ret
= rc4_send_bin_buffer(&ct
->rc4c
, buf2
, sz
);
275 btr_consume(btrn
, sz
);
281 ret
= btr_node_status(btrn
, 0, BTR_NT_ROOT
);
286 if (!FD_ISSET(ct
->rc4c
.fd
, &s
->rfds
))
288 buf2
= para_malloc(CLIENT_BUFSIZE
);
289 ret
= client_recv_buffer(ct
, buf2
, CLIENT_BUFSIZE
);
294 buf2
= para_realloc(buf2
, ret
);
295 btr_add_output(buf2
, ret
, btrn
);
302 if (ret
!= -E_SERVER_EOF
&& ret
!= -E_BTR_EOF
)
303 PARA_ERROR_LOG("%s\n", para_strerror(-t
->error
));
304 btr_remove_node(btrn
);
308 /* connect to para_server and register the client task */
309 static int client_connect(struct client_task
*ct
)
314 ret
= makesock(AF_UNSPEC
, IPPROTO_TCP
, 0, ct
->conf
.hostname_arg
,
315 ct
->conf
.server_port_arg
);
319 ct
->status
= CL_CONNECTED
;
320 ret
= mark_fd_nonblocking(ct
->rc4c
.fd
);
323 ct
->task
.pre_select
= client_pre_select
;
324 ct
->task
.post_select
= client_post_select
;
325 sprintf(ct
->task
.status
, "client");
326 register_task(&ct
->task
);
335 * Open connection to para_server.
337 * \param argc Usual argument count.
338 * \param argv Usual argument vector.
339 * \param ct_ptr Points to dynamically allocated and initialized client task
340 * struct upon successful return.
341 * \param loglevel If not \p NULL, the number of the loglevel is stored here.
343 * Check the command line options given by \a argc and argv, set default values
344 * for user name and rsa key file, read further option from the config file.
345 * Finally, establish a connection to para_server.
349 int client_open(int argc
, char *argv
[], struct client_task
**ct_ptr
,
350 int *loglevel
, struct btr_node
*parent
, struct btr_node
*child
)
352 char *home
= para_homedir();
354 struct client_task
*ct
= para_calloc(sizeof(struct client_task
));
356 ct
->btrn
= btr_new_node(&(struct btr_node_description
)
357 EMBRACE(.name
= "client", .parent
= parent
, .child
= child
));
360 ret
= -E_CLIENT_SYNTAX
;
361 if (client_cmdline_parser(argc
, argv
, &ct
->conf
))
363 HANDLE_VERSION_FLAG("client", ct
->conf
);
364 ret
= -E_CLIENT_SYNTAX
;
365 if (!ct
->conf
.inputs_num
)
367 ct
->user
= ct
->conf
.user_given
?
368 para_strdup(ct
->conf
.user_arg
) : para_logname();
370 ct
->key_file
= ct
->conf
.key_file_given
?
371 para_strdup(ct
->conf
.key_file_arg
) :
372 make_message("%s/.paraslash/key.%s", home
, ct
->user
);
374 ct
->config_file
= ct
->conf
.config_file_given
?
375 para_strdup(ct
->conf
.config_file_arg
) :
376 make_message("%s/.paraslash/client.conf", home
);
377 ret
= file_exists(ct
->config_file
);
378 if (!ret
&& ct
->conf
.config_file_given
) {
383 struct client_cmdline_parser_params params
= {
387 .check_ambiguity
= 0,
391 if (client_cmdline_parser_config_file(ct
->config_file
,
396 *loglevel
= get_loglevel_by_name(ct
->conf
.loglevel_arg
);
397 PARA_INFO_LOG("loglevel: %s\n", ct
->conf
.loglevel_arg
);
398 PARA_INFO_LOG("config_file: %s\n", ct
->config_file
);
399 PARA_INFO_LOG("key_file: %s\n", ct
->key_file
);
400 PARA_NOTICE_LOG("connecting %s:%d\n", ct
->conf
.hostname_arg
,
401 ct
->conf
.server_port_arg
);
402 ret
= client_connect(ct
);
406 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
407 btr_remove_node(ct
->btrn
);
408 btr_free_node(ct
->btrn
);