split client.c
[paraslash.git] / client_common.c
1 /*
2 * Copyright (C) 1997-2006 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.h"
31 #include "error.h"
32
33 void rc4_send(unsigned long len, const unsigned char *indata,
34 unsigned char *outdata, void *private_data)
35 {
36 struct private_client_data *pcd = private_data;
37 RC4(&pcd->rc4_send_key, len, indata, outdata);
38 }
39
40 void rc4_recv(unsigned long len, const unsigned char *indata,
41 unsigned char *outdata, void *private_data)
42 {
43 struct private_client_data *pcd = private_data;
44 RC4(&pcd->rc4_recv_key, len, indata, outdata);
45 }
46
47
48 void client_close(struct private_client_data *pcd)
49 {
50 if (pcd)
51 return;
52 if (pcd->fd >= 0)
53 close(pcd->fd);
54 free(pcd->user);
55 free(pcd->config_file);
56 free(pcd->key_file);
57 free(pcd);
58 }
59
60 int client_parse_config(int argc, char *argv[],
61 struct private_client_data **pcd_ptr)
62 {
63 char *home = para_homedir();
64 struct stat statbuf;
65 int ret;
66 struct private_client_data *pcd =
67 para_calloc(sizeof(struct private_client_data));
68
69 pcd->fd = -1;
70 cmdline_parser(argc, argv, &pcd->conf);
71 ret = - E_CLIENT_SYNTAX;
72 if (!pcd->conf.inputs_num)
73 goto out;
74 pcd->user = pcd->conf.user_given?
75 para_strdup(pcd->conf.user_arg) : para_logname();
76
77 pcd->key_file = pcd->conf.key_file_given?
78 para_strdup(pcd->conf.key_file_arg) :
79 make_message("%s/.paraslash/key.%s", home, pcd->user);
80
81 pcd->config_file = pcd->conf.config_file_given?
82 para_strdup(pcd->conf.config_file_arg) :
83 make_message("%s/.paraslash/client.conf", home);
84 ret = stat(pcd->config_file, &statbuf);
85 if (ret && pcd->conf.config_file_given) {
86 ret = -E_NO_CONFIG;
87 goto out;
88 }
89 if (!ret)
90 cmdline_parser_configfile(pcd->config_file, &pcd->conf, 0, 0, 0);
91 ret = 1;
92 *pcd_ptr = pcd;
93 PARA_INFO_LOG(
94 "current loglevel: %d\n"
95 "using config_file: %s\n"
96 "using key_file: %s\n"
97 "connecting to %s:%d\n" ,
98 pcd->conf.loglevel_arg,
99 pcd->config_file,
100 pcd->key_file,
101 pcd->conf.hostname_arg, pcd->conf.server_port_arg
102 );
103 out:
104 free(home);
105 if (ret < 0)
106 client_close(pcd);
107 return ret;
108 }
109
110 void client_pre_select(struct sched *s, struct task *t)
111 {
112 struct private_client_data *pcd = t->private_data;
113
114 PARA_INFO_LOG("status %d\n", pcd->status);
115 t->ret = 1;
116 pcd->check_r = 0;
117 pcd->check_w = 0;
118 if (pcd->fd < 0)
119 return;
120 switch (pcd->status) {
121 case CL_CONNECTED:
122 case CL_SENT_AUTH:
123 case CL_SENT_CH_RESPONSE:
124 case CL_SENT_COMMAND:
125 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
126 pcd->check_r = 1;
127 return;
128
129 case CL_RECEIVED_WELCOME:
130 case CL_RECEIVED_CHALLENGE:
131 case CL_RECEIVED_PROCEED:
132 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
133 pcd->check_w = 1;
134 return;
135
136 case CL_RECEIVING_SERVER_OUTPUT:
137 if (pcd->loaded < CLIENT_BUFSIZE - 1) {
138 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
139 pcd->check_r = 1;
140 }
141 return;
142 case CL_SENDING_STDIN:
143 if (*pcd->in_loaded) {
144 PARA_INFO_LOG("loaded: %d\n", *pcd->in_loaded);
145 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
146 pcd->check_w = 1;
147 } else {
148 if (*pcd->in_eof) {
149 t->ret = -E_INPUT_EOF;
150 s->timeout.tv_sec = 0;
151 s->timeout.tv_usec = 1;
152 }
153 }
154 return;
155 }
156 }
157
158 static ssize_t client_recv_buffer(struct private_client_data *pcd)
159 {
160 ssize_t ret = recv_buffer(pcd->fd, pcd->buf + pcd->loaded,
161 CLIENT_BUFSIZE - pcd->loaded);
162 if (!ret)
163 return -E_SERVER_EOF;
164 if (ret > 0)
165 pcd->loaded += ret;
166 return ret;
167
168 }
169
170 void client_post_select(struct sched *s, struct task *t)
171 {
172 struct private_client_data *pcd = t->private_data;
173
174 PARA_INFO_LOG("status %d\n", pcd->status);
175 t->ret = 1;
176 if (pcd->fd < 0)
177 return;
178 if (!pcd->check_r && !pcd->check_w)
179 return;
180 if (pcd->check_r && !FD_ISSET(pcd->fd, &s->rfds))
181 return;
182 if (pcd->check_w && !FD_ISSET(pcd->fd, &s->wfds))
183 return;
184 switch (pcd->status) {
185 case CL_CONNECTED: /* receive welcome message */
186 t->ret = client_recv_buffer(pcd);
187 if (t->ret > 0)
188 pcd->status = CL_RECEIVED_WELCOME;
189 return;
190 case CL_RECEIVED_WELCOME: /* send auth command */
191 sprintf(pcd->buf, "auth %s%s", pcd->conf.plain_given?
192 "" : "rc4 ", pcd->user);
193 PARA_INFO_LOG("--> %s\n", pcd->buf);
194 t->ret = send_buffer(pcd->fd, pcd->buf);
195 if (t->ret >= 0)
196 pcd->status = CL_SENT_AUTH;
197 return;
198 case CL_SENT_AUTH: /* receive challenge number */
199 pcd->loaded = 0;
200 t->ret = client_recv_buffer(pcd);
201 if (t->ret < 0)
202 return;
203 if (t->ret != 64) {
204 t->ret = -E_INVALID_CHALLENGE;
205 PARA_ERROR_LOG("received the following: %s\n", pcd->buf);
206 return;
207 }
208 PARA_INFO_LOG("%s", "<-- [challenge]\n");
209 /* decrypt challenge number */
210 t->ret = para_decrypt_challenge(pcd->key_file, &pcd->challenge_nr,
211 (unsigned char *) pcd->buf, 64);
212 if (t->ret > 0)
213 pcd->status = CL_RECEIVED_CHALLENGE;
214 return;
215 case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
216 PARA_INFO_LOG("--> %lu\n", pcd->challenge_nr);
217 t->ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
218 pcd->challenge_nr);
219 if (t->ret > 0)
220 pcd->status = CL_SENT_CH_RESPONSE;
221 return;
222 case CL_SENT_CH_RESPONSE: /* read server response */
223 {
224 size_t bytes_received;
225 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
226 pcd->loaded = 0;
227 t->ret = client_recv_buffer(pcd);
228 if (t->ret < 0)
229 return;
230 bytes_received = t->ret;
231 PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
232 "info ++++\n", pcd->buf);
233 /* check if server has sent "Proceed" message */
234 t->ret = -E_CLIENT_AUTH;
235 if (!strstr(pcd->buf, PROCEED_MSG))
236 return;
237 t->ret = 1;
238 pcd->status = CL_RECEIVED_PROCEED;
239 if (bytes_received < PROCEED_MSG_LEN + 32)
240 return;
241 PARA_INFO_LOG("%s", "decrypting session key\n");
242 t->ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
243 (unsigned char *)pcd->buf + PROCEED_MSG_LEN + 1,
244 bytes_received - PROCEED_MSG_LEN - 1);
245 if (t->ret < 0)
246 return;
247 RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
248 RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
249 enable_crypt(pcd->fd, rc4_recv, rc4_send, pcd);
250 }
251 case CL_RECEIVED_PROCEED: /* concat args and send command */
252 {
253 int i;
254 char *command = NULL;
255 for (i = 0; i < pcd->conf.inputs_num; i++) {
256 char *tmp = command;
257 command = make_message("%s\n%s", command?
258 command : "", pcd->conf.inputs[i]);
259 free(tmp);
260 }
261 command = para_strcat(command, EOC_MSG "\n");
262 PARA_INFO_LOG("--> %s\n", command);
263 t->ret = send_buffer(pcd->fd, command);
264 free(command);
265 if (t->ret > 0)
266 pcd->status = CL_SENT_COMMAND;
267 return;
268 }
269 case CL_SENT_COMMAND:
270 pcd->loaded = 0;
271 t->ret = client_recv_buffer(pcd);
272 if (t->ret < 0)
273 return;
274 t->ret = -E_HANDSHAKE_COMPLETE;
275 if (strstr(pcd->buf, AWAITING_DATA_MSG))
276 pcd->status = CL_SENDING_STDIN;
277 else
278 pcd->status = CL_RECEIVING_SERVER_OUTPUT;
279 return;
280 case CL_SENDING_STDIN: /* FIXME: might block */
281 PARA_INFO_LOG("loaded: %d\n", *pcd->in_loaded);
282 t->ret = send_bin_buffer(pcd->fd, pcd->inbuf, *pcd->in_loaded);
283 if (t->ret <= 0) {
284 if (!t->ret)
285 t->ret = 1;
286 return;
287 }
288 *pcd->in_loaded = 0; /* FIXME: short writes */
289 return;
290 case CL_RECEIVING_SERVER_OUTPUT:
291 t->ret = client_recv_buffer(pcd);
292 return;
293 }
294
295 }
296
297 int client_open(struct private_client_data *pcd)
298 {
299 int ret;
300 struct hostent *he;
301 struct sockaddr_in their_addr;
302
303 /* get the host info */
304 PARA_NOTICE_LOG("getting host info of %s\n",
305 pcd->conf.hostname_arg);
306 ret = get_host_info(pcd->conf.hostname_arg, &he);
307 if (ret < 0)
308 goto out;
309 /* get new socket */
310 ret = get_socket();
311 if (ret < 0)
312 goto out;
313 pcd->fd = ret;
314 /* init their_addr */
315 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
316 /* connect */
317 PARA_NOTICE_LOG("connecting to %s\n", pcd->conf.hostname_arg);
318 ret = para_connect(pcd->fd, &their_addr);
319 if (ret < 0)
320 goto out;
321 pcd->status = CL_CONNECTED;
322 pcd->task.pre_select = client_pre_select;
323 pcd->task.post_select = client_post_select;
324 pcd->task.private_data = pcd;
325 sprintf(pcd->task.status, "client");
326 register_task(&pcd->task);
327 ret = 1;
328 out:
329 return ret;
330 }