2 * Copyright (C) 1997-2008 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) {
120 PARA_INFO_LOG("loaded: %zd\n", *ct->in_loaded);
121 para_fd_set(ct->fd, &s->wfds, &s->max_fileno);
125 t->error = *ct->in_error;
126 s->timeout.tv_sec = 0;
127 s->timeout.tv_usec = 1;
134 static ssize_t client_recv_buffer(struct client_task *ct)
136 ssize_t ret = recv_buffer(ct->fd, ct->buf + ct->loaded,
137 CLIENT_BUFSIZE - ct->loaded);
139 return -E_SERVER_EOF;
147 * The post select hook for client commands.
149 * \param s Pointer to the scheduler.
150 * \param t Pointer to the task struct for this command.
152 * Depending on the current state of the connection and the status of the read
153 * and write fd sets of \a s, this function performs the necessary steps to
154 * authenticate the connection, to send the command given by \a t->private_data
155 * and to receive para_server's output, if any.
157 * \sa struct sched, struct task.
159 static void client_post_select(struct sched *s, struct task *t)
161 struct client_task *ct = container_of(t, struct client_task, task);
166 if (!ct->check_r && !ct->check_w)
168 if (ct->check_r && !FD_ISSET(ct->fd, &s->rfds))
170 if (ct->check_w && !FD_ISSET(ct->fd, &s->wfds))
172 switch (ct->status) {
173 case CL_CONNECTED: /* receive welcome message */
174 t->error = client_recv_buffer(ct);
176 ct->status = CL_RECEIVED_WELCOME;
178 case CL_RECEIVED_WELCOME: /* send auth command */
179 sprintf(ct->buf, "auth %s%s", ct->conf.plain_given?
180 "" : "rc4 ", ct->user);
181 PARA_INFO_LOG("--> %s\n", ct->buf);
182 t->error = send_buffer(ct->fd, ct->buf);
184 ct->status = CL_SENT_AUTH;
186 case CL_SENT_AUTH: /* receive challenge number */
188 t->error = client_recv_buffer(ct);
191 if (t->error != 64) {
192 t->error = -E_INVALID_CHALLENGE;
193 PARA_ERROR_LOG("received the following: %s\n", ct->buf);
196 PARA_INFO_LOG("<-- [challenge]\n");
197 /* decrypt challenge number */
198 t->error = para_decrypt_challenge(ct->key_file, &ct->challenge_nr,
199 (unsigned char *) ct->buf, 64);
201 ct->status = CL_RECEIVED_CHALLENGE;
203 case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
204 PARA_INFO_LOG("--> %lu\n", ct->challenge_nr);
205 t->error = send_va_buffer(ct->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
208 ct->status = CL_SENT_CH_RESPONSE;
210 case CL_SENT_CH_RESPONSE: /* read server response */
212 size_t bytes_received;
213 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
215 t->error = client_recv_buffer(ct);
218 bytes_received = t->error;
219 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
220 "info ++++\n", ct->buf);
221 /* check if server has sent "Proceed" message */
222 t->error = -E_CLIENT_AUTH;
223 if (!strstr(ct->buf, PROCEED_MSG))
226 ct->status = CL_RECEIVED_PROCEED;
227 if (bytes_received < PROCEED_MSG_LEN + 32)
229 PARA_INFO_LOG("decrypting session key\n");
230 t->error = para_decrypt_buffer(ct->key_file, rc4_buf,
231 (unsigned char *)ct->buf + PROCEED_MSG_LEN + 1,
232 bytes_received - PROCEED_MSG_LEN - 1);
235 RC4_set_key(&ct->rc4_send_key, RC4_KEY_LEN, rc4_buf);
236 RC4_set_key(&ct->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
237 enable_crypt(ct->fd, rc4_recv, rc4_send, ct);
239 case CL_RECEIVED_PROCEED: /* concat args and send command */
242 char *command = NULL;
243 for (i = 0; i < ct->conf.inputs_num; i++) {
245 command = make_message("%s\n%s", command?
246 command : "", ct->conf.inputs[i]);
249 command = para_strcat(command, EOC_MSG "\n");
250 PARA_DEBUG_LOG("--> %s\n", command);
251 t->error = send_buffer(ct->fd, command);
254 ct->status = CL_SENT_COMMAND;
257 case CL_SENT_COMMAND:
259 t->error = client_recv_buffer(ct);
262 if (strstr(ct->buf, AWAITING_DATA_MSG))
263 ct->status = CL_SENDING;
265 ct->status = CL_RECEIVING;
267 case CL_SENDING: /* FIXME: might block */
268 PARA_INFO_LOG("loaded: %zd\n", *ct->in_loaded);
269 t->error = send_bin_buffer(ct->fd, ct->inbuf, *ct->in_loaded);
275 t->error = client_recv_buffer(ct);
280 /* connect to para_server and register the client task */
281 static int client_connect(struct client_task *ct)
286 ret = makesock(AF_UNSPEC, IPPROTO_TCP, 0, ct->conf.hostname_arg,
287 ct->conf.server_port_arg);
291 ct->status = CL_CONNECTED;
292 ret = mark_fd_nonblocking(ct->fd);
295 ct->task.pre_select = client_pre_select;
296 ct->task.post_select = client_post_select;
297 sprintf(ct->task.status, "client");
298 register_task(&ct->task);
307 * Open connection to para_server.
309 * \param argc Usual argument count.
310 * \param argv Usual argument vector.
311 * \param ct_ptr Points to dynamically allocated and initialized client task
312 * struct upon successful return.
314 * Check the command line options given by \a argc and argv, set default values
315 * for user name and rsa key file, read further option from the config file.
316 * Finally, establish a connection to para_server.
320 int client_open(int argc, char *argv[], struct client_task **ct_ptr)
322 char *home = para_homedir();
325 struct client_task *ct = para_calloc(sizeof(struct client_task));
329 ret = client_cmdline_parser(argc, argv, &ct->conf);
330 HANDLE_VERSION_FLAG("client", ct->conf);
331 ret = -E_CLIENT_SYNTAX;
332 if (!ct->conf.inputs_num)
334 ct->user = ct->conf.user_given?
335 para_strdup(ct->conf.user_arg) : para_logname();
337 ct->key_file = ct->conf.key_file_given?
338 para_strdup(ct->conf.key_file_arg) :
339 make_message("%s/.paraslash/key.%s", home, ct->user);
341 ct->config_file = ct->conf.config_file_given?
342 para_strdup(ct->conf.config_file_arg) :
343 make_message("%s/.paraslash/client.conf", home);
344 ret = stat(ct->config_file, &statbuf);
345 if (ret && ct->conf.config_file_given) {
350 struct client_cmdline_parser_params params = {
356 client_cmdline_parser_config_file(ct->config_file,
360 PARA_INFO_LOG("loglevel: %d\n", ct->conf.loglevel_arg);
361 PARA_INFO_LOG("config_file: %s\n", ct->config_file);
362 PARA_INFO_LOG("key_file: %s\n", ct->key_file);
363 PARA_NOTICE_LOG("connecting %s:%d\n", ct->conf.hostname_arg,
364 ct->conf.server_port_arg);
365 ret = client_connect(ct);
369 PARA_ERROR_LOG("%s\n", para_strerror(-ret));