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 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));