2 * Copyright (C) 1997-2006 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file client_common.c common functions of para_client and para_audiod */
24 #include "client.cmdline.h"
30 #include "client.cmdline.h"
34 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);
41 void rc4_recv(unsigned long len, const unsigned char *indata,
42 unsigned char *outdata, void *private_data)
44 struct private_client_data *pcd = private_data;
45 RC4(&pcd->rc4_recv_key, len, indata, outdata);
49 void client_close(struct private_client_data *pcd)
54 disable_crypt(pcd->fd);
58 free(pcd->config_file);
63 int client_parse_config(int argc, char *argv[],
64 struct private_client_data **pcd_ptr)
66 char *home = para_homedir();
69 struct private_client_data *pcd =
70 para_calloc(sizeof(struct private_client_data));
73 client_cmdline_parser(argc, argv, &pcd->conf);
74 ret = - E_CLIENT_SYNTAX;
75 if (!pcd->conf.inputs_num)
77 pcd->user = pcd->conf.user_given?
78 para_strdup(pcd->conf.user_arg) : para_logname();
80 pcd->key_file = pcd->conf.key_file_given?
81 para_strdup(pcd->conf.key_file_arg) :
82 make_message("%s/.paraslash/key.%s", home, pcd->user);
84 pcd->config_file = pcd->conf.config_file_given?
85 para_strdup(pcd->conf.config_file_arg) :
86 make_message("%s/.paraslash/client.conf", home);
87 ret = stat(pcd->config_file, &statbuf);
88 if (ret && pcd->conf.config_file_given) {
93 client_cmdline_parser_configfile(pcd->config_file,
97 PARA_INFO_LOG("loglevel: %d\n", pcd->conf.loglevel_arg);
98 PARA_INFO_LOG("config_file: %s\n", pcd->config_file);
99 PARA_INFO_LOG("key_file: %s\n", pcd->key_file);
100 PARA_NOTICE_LOG("connecting %s:%d\n", pcd->conf.hostname_arg,
101 pcd->conf.server_port_arg);
109 void client_pre_select(struct sched *s, struct task *t)
111 struct private_client_data *pcd = t->private_data;
118 switch (pcd->status) {
121 case CL_SENT_CH_RESPONSE:
122 case CL_SENT_COMMAND:
123 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
127 case CL_RECEIVED_WELCOME:
128 case CL_RECEIVED_CHALLENGE:
129 case CL_RECEIVED_PROCEED:
130 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
135 if (pcd->loaded < CLIENT_BUFSIZE - 1) {
136 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
141 if (*pcd->in_loaded) {
142 PARA_INFO_LOG("loaded: %zd\n", *pcd->in_loaded);
143 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
147 t->ret = -E_INPUT_EOF;
148 s->timeout.tv_sec = 0;
149 s->timeout.tv_usec = 1;
156 static ssize_t client_recv_buffer(struct private_client_data *pcd)
158 ssize_t ret = recv_buffer(pcd->fd, pcd->buf + pcd->loaded,
159 CLIENT_BUFSIZE - pcd->loaded);
161 return -E_SERVER_EOF;
168 void client_post_select(struct sched *s, struct task *t)
170 struct private_client_data *pcd = t->private_data;
172 // PARA_INFO_LOG("status %d\n", pcd->status);
176 if (!pcd->check_r && !pcd->check_w)
178 if (pcd->check_r && !FD_ISSET(pcd->fd, &s->rfds))
180 if (pcd->check_w && !FD_ISSET(pcd->fd, &s->wfds))
182 switch (pcd->status) {
183 case CL_CONNECTED: /* receive welcome message */
184 t->ret = client_recv_buffer(pcd);
186 pcd->status = CL_RECEIVED_WELCOME;
188 case CL_RECEIVED_WELCOME: /* send auth command */
189 sprintf(pcd->buf, "auth %s%s", pcd->conf.plain_given?
190 "" : "rc4 ", pcd->user);
191 PARA_INFO_LOG("--> %s\n", pcd->buf);
192 t->ret = send_buffer(pcd->fd, pcd->buf);
194 pcd->status = CL_SENT_AUTH;
196 case CL_SENT_AUTH: /* receive challenge number */
198 t->ret = client_recv_buffer(pcd);
202 t->ret = -E_INVALID_CHALLENGE;
203 PARA_ERROR_LOG("received the following: %s\n", pcd->buf);
206 PARA_INFO_LOG("%s", "<-- [challenge]\n");
207 /* decrypt challenge number */
208 t->ret = para_decrypt_challenge(pcd->key_file, &pcd->challenge_nr,
209 (unsigned char *) pcd->buf, 64);
211 pcd->status = CL_RECEIVED_CHALLENGE;
213 case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
214 PARA_INFO_LOG("--> %lu\n", pcd->challenge_nr);
215 t->ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
218 pcd->status = CL_SENT_CH_RESPONSE;
220 case CL_SENT_CH_RESPONSE: /* read server response */
222 size_t bytes_received;
223 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
225 t->ret = client_recv_buffer(pcd);
228 bytes_received = t->ret;
229 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
230 "info ++++\n", pcd->buf);
231 /* check if server has sent "Proceed" message */
232 t->ret = -E_CLIENT_AUTH;
233 if (!strstr(pcd->buf, PROCEED_MSG))
236 pcd->status = CL_RECEIVED_PROCEED;
237 if (bytes_received < PROCEED_MSG_LEN + 32)
239 PARA_INFO_LOG("%s", "decrypting session key\n");
240 t->ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
241 (unsigned char *)pcd->buf + PROCEED_MSG_LEN + 1,
242 bytes_received - PROCEED_MSG_LEN - 1);
245 RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
246 RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
247 enable_crypt(pcd->fd, rc4_recv, rc4_send, pcd);
249 case CL_RECEIVED_PROCEED: /* concat args and send command */
252 char *command = NULL;
253 for (i = 0; i < pcd->conf.inputs_num; i++) {
255 command = make_message("%s\n%s", command?
256 command : "", pcd->conf.inputs[i]);
259 command = para_strcat(command, EOC_MSG "\n");
260 PARA_DEBUG_LOG("--> %s\n", command);
261 t->ret = send_buffer(pcd->fd, command);
264 pcd->status = CL_SENT_COMMAND;
267 case CL_SENT_COMMAND:
269 t->ret = client_recv_buffer(pcd);
272 t->ret = -E_HANDSHAKE_COMPLETE;
273 if (strstr(pcd->buf, AWAITING_DATA_MSG))
274 pcd->status = CL_SENDING;
276 pcd->status = CL_RECEIVING;
278 case CL_SENDING: /* FIXME: might block */
279 PARA_INFO_LOG("loaded: %zd\n", *pcd->in_loaded);
280 t->ret = send_bin_buffer(pcd->fd, pcd->inbuf, *pcd->in_loaded);
286 *pcd->in_loaded = 0; /* FIXME: short writes */
289 t->ret = client_recv_buffer(pcd);
295 int client_open(struct private_client_data *pcd)
299 struct sockaddr_in their_addr;
301 ret = get_host_info(pcd->conf.hostname_arg, &he);
309 /* init their_addr */
310 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
311 ret = para_connect(pcd->fd, &their_addr);
314 pcd->status = CL_CONNECTED;
315 ret = mark_fd_nonblock(pcd->fd);
318 pcd->task.pre_select = client_pre_select;
319 pcd->task.post_select = client_post_select;
320 pcd->task.private_data = pcd;
321 sprintf(pcd->task.status, "client");
322 register_task(&pcd->task);