12c8365661e6c8f7e0608c66cd7d65a659e219cb
[paraslash.git] / client_common.c
1 /*
2 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
3 *
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.
8 *
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.
13 *
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.
17 */
18
19 /** \file client_common.c common functions of para_client and para_audiod */
20
21 #include "para.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "client.cmdline.h"
25 #include "crypt.h"
26 #include "rc4.h"
27 #include "net.h"
28 #include "fd.h"
29 #include "string.h"
30 #include "client.cmdline.h"
31 #include "client.h"
32 #include "error.h"
33
34 void rc4_send(unsigned long len, const unsigned char *indata,
35 unsigned char *outdata, void *private_data)
36 {
37 struct private_client_data *pcd = private_data;
38 RC4(&pcd->rc4_send_key, len, indata, outdata);
39 }
40
41 void rc4_recv(unsigned long len, const unsigned char *indata,
42 unsigned char *outdata, void *private_data)
43 {
44 struct private_client_data *pcd = private_data;
45 RC4(&pcd->rc4_recv_key, len, indata, outdata);
46 }
47
48
49 void client_close(struct private_client_data *pcd)
50 {
51 if (!pcd)
52 return;
53 if (pcd->fd >= 0) {
54 disable_crypt(pcd->fd);
55 close(pcd->fd);
56 }
57 free(pcd->user);
58 free(pcd->config_file);
59 free(pcd->key_file);
60 free(pcd);
61 }
62
63 static int client_connect(struct private_client_data *pcd)
64 {
65 int ret;
66 struct hostent *he;
67 struct sockaddr_in their_addr;
68
69 pcd->fd = -1;
70 ret = get_host_info(pcd->conf.hostname_arg, &he);
71 if (ret < 0)
72 return ret;
73 /* get new socket */
74 ret = get_socket();
75 if (ret < 0)
76 return ret;
77 pcd->fd = ret;
78 /* init their_addr */
79 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
80 ret = para_connect(pcd->fd, &their_addr);
81 if (ret < 0)
82 goto err_out;
83 pcd->status = CL_CONNECTED;
84 ret = mark_fd_nonblock(pcd->fd);
85 if (ret < 0)
86 goto err_out;
87 pcd->task.pre_select = client_pre_select;
88 pcd->task.post_select = client_post_select;
89 pcd->task.private_data = pcd;
90 sprintf(pcd->task.status, "client");
91 register_task(&pcd->task);
92 return 1;
93 err_out:
94 close(pcd->fd);
95 pcd->fd = -1;
96 return ret;
97 }
98
99 int client_open(int argc, char *argv[], struct private_client_data **pcd_ptr)
100 {
101 char *home = para_homedir();
102 struct stat statbuf;
103 int ret;
104 struct private_client_data *pcd =
105 para_calloc(sizeof(struct private_client_data));
106
107 *pcd_ptr = pcd;
108 pcd->fd = -1;
109 ret = client_cmdline_parser(argc, argv, &pcd->conf);
110 ret = -E_CLIENT_SYNTAX;
111 if (!pcd->conf.inputs_num)
112 goto out;
113 pcd->user = pcd->conf.user_given?
114 para_strdup(pcd->conf.user_arg) : para_logname();
115
116 pcd->key_file = pcd->conf.key_file_given?
117 para_strdup(pcd->conf.key_file_arg) :
118 make_message("%s/.paraslash/key.%s", home, pcd->user);
119
120 pcd->config_file = pcd->conf.config_file_given?
121 para_strdup(pcd->conf.config_file_arg) :
122 make_message("%s/.paraslash/client.conf", home);
123 ret = stat(pcd->config_file, &statbuf);
124 if (ret && pcd->conf.config_file_given) {
125 ret = -E_NO_CONFIG;
126 goto out;
127 }
128 if (!ret)
129 client_cmdline_parser_configfile(pcd->config_file,
130 &pcd->conf, 0, 0, 0);
131 ret = 1;
132 PARA_INFO_LOG("loglevel: %d\n", pcd->conf.loglevel_arg);
133 PARA_INFO_LOG("config_file: %s\n", pcd->config_file);
134 PARA_INFO_LOG("key_file: %s\n", pcd->key_file);
135 PARA_NOTICE_LOG("connecting %s:%d\n", pcd->conf.hostname_arg,
136 pcd->conf.server_port_arg);
137 ret = client_connect(pcd);
138 out:
139 free(home);
140 if (ret < 0) {
141 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
142 client_close(pcd);
143 }
144 return ret;
145 }
146
147 void client_pre_select(struct sched *s, struct task *t)
148 {
149 struct private_client_data *pcd = t->private_data;
150
151 t->ret = 1;
152 pcd->check_r = 0;
153 pcd->check_w = 0;
154 if (pcd->fd < 0)
155 return;
156 switch (pcd->status) {
157 case CL_CONNECTED:
158 case CL_SENT_AUTH:
159 case CL_SENT_CH_RESPONSE:
160 case CL_SENT_COMMAND:
161 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
162 pcd->check_r = 1;
163 return;
164
165 case CL_RECEIVED_WELCOME:
166 case CL_RECEIVED_CHALLENGE:
167 case CL_RECEIVED_PROCEED:
168 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
169 pcd->check_w = 1;
170 return;
171
172 case CL_RECEIVING:
173 if (pcd->loaded < CLIENT_BUFSIZE - 1) {
174 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
175 pcd->check_r = 1;
176 }
177 return;
178 case CL_SENDING:
179 if (*pcd->in_loaded) {
180 PARA_INFO_LOG("loaded: %zd\n", *pcd->in_loaded);
181 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
182 pcd->check_w = 1;
183 } else {
184 if (*pcd->in_eof) {
185 t->ret = -E_INPUT_EOF;
186 s->timeout.tv_sec = 0;
187 s->timeout.tv_usec = 1;
188 }
189 }
190 return;
191 }
192 }
193
194 static ssize_t client_recv_buffer(struct private_client_data *pcd)
195 {
196 ssize_t ret = recv_buffer(pcd->fd, pcd->buf + pcd->loaded,
197 CLIENT_BUFSIZE - pcd->loaded);
198 if (!ret)
199 return -E_SERVER_EOF;
200 if (ret > 0)
201 pcd->loaded += ret;
202 return ret;
203
204 }
205
206 void client_post_select(struct sched *s, struct task *t)
207 {
208 struct private_client_data *pcd = t->private_data;
209
210 // PARA_INFO_LOG("status %d\n", pcd->status);
211 t->ret = 1;
212 if (pcd->fd < 0)
213 return;
214 if (!pcd->check_r && !pcd->check_w)
215 return;
216 if (pcd->check_r && !FD_ISSET(pcd->fd, &s->rfds))
217 return;
218 if (pcd->check_w && !FD_ISSET(pcd->fd, &s->wfds))
219 return;
220 switch (pcd->status) {
221 case CL_CONNECTED: /* receive welcome message */
222 t->ret = client_recv_buffer(pcd);
223 if (t->ret > 0)
224 pcd->status = CL_RECEIVED_WELCOME;
225 return;
226 case CL_RECEIVED_WELCOME: /* send auth command */
227 sprintf(pcd->buf, "auth %s%s", pcd->conf.plain_given?
228 "" : "rc4 ", pcd->user);
229 PARA_INFO_LOG("--> %s\n", pcd->buf);
230 t->ret = send_buffer(pcd->fd, pcd->buf);
231 if (t->ret >= 0)
232 pcd->status = CL_SENT_AUTH;
233 return;
234 case CL_SENT_AUTH: /* receive challenge number */
235 pcd->loaded = 0;
236 t->ret = client_recv_buffer(pcd);
237 if (t->ret < 0)
238 return;
239 if (t->ret != 64) {
240 t->ret = -E_INVALID_CHALLENGE;
241 PARA_ERROR_LOG("received the following: %s\n", pcd->buf);
242 return;
243 }
244 PARA_INFO_LOG("%s", "<-- [challenge]\n");
245 /* decrypt challenge number */
246 t->ret = para_decrypt_challenge(pcd->key_file, &pcd->challenge_nr,
247 (unsigned char *) pcd->buf, 64);
248 if (t->ret > 0)
249 pcd->status = CL_RECEIVED_CHALLENGE;
250 return;
251 case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
252 PARA_INFO_LOG("--> %lu\n", pcd->challenge_nr);
253 t->ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
254 pcd->challenge_nr);
255 if (t->ret > 0)
256 pcd->status = CL_SENT_CH_RESPONSE;
257 return;
258 case CL_SENT_CH_RESPONSE: /* read server response */
259 {
260 size_t bytes_received;
261 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
262 pcd->loaded = 0;
263 t->ret = client_recv_buffer(pcd);
264 if (t->ret < 0)
265 return;
266 bytes_received = t->ret;
267 PARA_DEBUG_LOG("++++ server info ++++\n%s\n++++ end of server "
268 "info ++++\n", pcd->buf);
269 /* check if server has sent "Proceed" message */
270 t->ret = -E_CLIENT_AUTH;
271 if (!strstr(pcd->buf, PROCEED_MSG))
272 return;
273 t->ret = 1;
274 pcd->status = CL_RECEIVED_PROCEED;
275 if (bytes_received < PROCEED_MSG_LEN + 32)
276 return;
277 PARA_INFO_LOG("%s", "decrypting session key\n");
278 t->ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
279 (unsigned char *)pcd->buf + PROCEED_MSG_LEN + 1,
280 bytes_received - PROCEED_MSG_LEN - 1);
281 if (t->ret < 0)
282 return;
283 RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
284 RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
285 enable_crypt(pcd->fd, rc4_recv, rc4_send, pcd);
286 }
287 case CL_RECEIVED_PROCEED: /* concat args and send command */
288 {
289 int i;
290 char *command = NULL;
291 for (i = 0; i < pcd->conf.inputs_num; i++) {
292 char *tmp = command;
293 command = make_message("%s\n%s", command?
294 command : "", pcd->conf.inputs[i]);
295 free(tmp);
296 }
297 command = para_strcat(command, EOC_MSG "\n");
298 PARA_DEBUG_LOG("--> %s\n", command);
299 t->ret = send_buffer(pcd->fd, command);
300 free(command);
301 if (t->ret > 0)
302 pcd->status = CL_SENT_COMMAND;
303 return;
304 }
305 case CL_SENT_COMMAND:
306 pcd->loaded = 0;
307 t->ret = client_recv_buffer(pcd);
308 if (t->ret < 0)
309 return;
310 t->ret = -E_HANDSHAKE_COMPLETE;
311 if (strstr(pcd->buf, AWAITING_DATA_MSG))
312 pcd->status = CL_SENDING;
313 else
314 pcd->status = CL_RECEIVING;
315 return;
316 case CL_SENDING: /* FIXME: might block */
317 PARA_INFO_LOG("loaded: %zd\n", *pcd->in_loaded);
318 t->ret = send_bin_buffer(pcd->fd, pcd->inbuf, *pcd->in_loaded);
319 if (t->ret < 0)
320 return;
321 *pcd->in_loaded = 0; /* FIXME: short writes */
322 return;
323 case CL_RECEIVING:
324 t->ret = client_recv_buffer(pcd);
325 return;
326 }
327
328 }