Simpify client_post_select()
[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.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 int client_parse_config(int argc, char *argv[],
64 struct private_client_data **pcd_ptr)
65 {
66 char *home = para_homedir();
67 struct stat statbuf;
68 int ret;
69 struct private_client_data *pcd =
70 para_calloc(sizeof(struct private_client_data));
71
72 pcd->fd = -1;
73 client_cmdline_parser(argc, argv, &pcd->conf);
74 ret = - E_CLIENT_SYNTAX;
75 if (!pcd->conf.inputs_num)
76 goto out;
77 pcd->user = pcd->conf.user_given?
78 para_strdup(pcd->conf.user_arg) : para_logname();
79
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);
83
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) {
89 ret = -E_NO_CONFIG;
90 goto out;
91 }
92 if (!ret)
93 client_cmdline_parser_configfile(pcd->config_file,
94 &pcd->conf, 0, 0, 0);
95 ret = 1;
96 *pcd_ptr = pcd;
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);
102 out:
103 free(home);
104 if (ret < 0)
105 client_close(pcd);
106 return ret;
107 }
108
109 void client_pre_select(struct sched *s, struct task *t)
110 {
111 struct private_client_data *pcd = t->private_data;
112
113 t->ret = 1;
114 pcd->check_r = 0;
115 pcd->check_w = 0;
116 if (pcd->fd < 0)
117 return;
118 switch (pcd->status) {
119 case CL_CONNECTED:
120 case CL_SENT_AUTH:
121 case CL_SENT_CH_RESPONSE:
122 case CL_SENT_COMMAND:
123 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
124 pcd->check_r = 1;
125 return;
126
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);
131 pcd->check_w = 1;
132 return;
133
134 case CL_RECEIVING:
135 if (pcd->loaded < CLIENT_BUFSIZE - 1) {
136 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
137 pcd->check_r = 1;
138 }
139 return;
140 case CL_SENDING:
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);
144 pcd->check_w = 1;
145 } else {
146 if (*pcd->in_eof) {
147 t->ret = -E_INPUT_EOF;
148 s->timeout.tv_sec = 0;
149 s->timeout.tv_usec = 1;
150 }
151 }
152 return;
153 }
154 }
155
156 static ssize_t client_recv_buffer(struct private_client_data *pcd)
157 {
158 ssize_t ret = recv_buffer(pcd->fd, pcd->buf + pcd->loaded,
159 CLIENT_BUFSIZE - pcd->loaded);
160 if (!ret)
161 return -E_SERVER_EOF;
162 if (ret > 0)
163 pcd->loaded += ret;
164 return ret;
165
166 }
167
168 void client_post_select(struct sched *s, struct task *t)
169 {
170 struct private_client_data *pcd = t->private_data;
171
172 // PARA_INFO_LOG("status %d\n", pcd->status);
173 t->ret = 1;
174 if (pcd->fd < 0)
175 return;
176 if (!pcd->check_r && !pcd->check_w)
177 return;
178 if (pcd->check_r && !FD_ISSET(pcd->fd, &s->rfds))
179 return;
180 if (pcd->check_w && !FD_ISSET(pcd->fd, &s->wfds))
181 return;
182 switch (pcd->status) {
183 case CL_CONNECTED: /* receive welcome message */
184 t->ret = client_recv_buffer(pcd);
185 if (t->ret > 0)
186 pcd->status = CL_RECEIVED_WELCOME;
187 return;
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);
193 if (t->ret >= 0)
194 pcd->status = CL_SENT_AUTH;
195 return;
196 case CL_SENT_AUTH: /* receive challenge number */
197 pcd->loaded = 0;
198 t->ret = client_recv_buffer(pcd);
199 if (t->ret < 0)
200 return;
201 if (t->ret != 64) {
202 t->ret = -E_INVALID_CHALLENGE;
203 PARA_ERROR_LOG("received the following: %s\n", pcd->buf);
204 return;
205 }
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);
210 if (t->ret > 0)
211 pcd->status = CL_RECEIVED_CHALLENGE;
212 return;
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,
216 pcd->challenge_nr);
217 if (t->ret > 0)
218 pcd->status = CL_SENT_CH_RESPONSE;
219 return;
220 case CL_SENT_CH_RESPONSE: /* read server response */
221 {
222 size_t bytes_received;
223 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
224 pcd->loaded = 0;
225 t->ret = client_recv_buffer(pcd);
226 if (t->ret < 0)
227 return;
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))
234 return;
235 t->ret = 1;
236 pcd->status = CL_RECEIVED_PROCEED;
237 if (bytes_received < PROCEED_MSG_LEN + 32)
238 return;
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);
243 if (t->ret < 0)
244 return;
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);
248 }
249 case CL_RECEIVED_PROCEED: /* concat args and send command */
250 {
251 int i;
252 char *command = NULL;
253 for (i = 0; i < pcd->conf.inputs_num; i++) {
254 char *tmp = command;
255 command = make_message("%s\n%s", command?
256 command : "", pcd->conf.inputs[i]);
257 free(tmp);
258 }
259 command = para_strcat(command, EOC_MSG "\n");
260 PARA_DEBUG_LOG("--> %s\n", command);
261 t->ret = send_buffer(pcd->fd, command);
262 free(command);
263 if (t->ret > 0)
264 pcd->status = CL_SENT_COMMAND;
265 return;
266 }
267 case CL_SENT_COMMAND:
268 pcd->loaded = 0;
269 t->ret = client_recv_buffer(pcd);
270 if (t->ret < 0)
271 return;
272 t->ret = -E_HANDSHAKE_COMPLETE;
273 if (strstr(pcd->buf, AWAITING_DATA_MSG))
274 pcd->status = CL_SENDING;
275 else
276 pcd->status = CL_RECEIVING;
277 return;
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);
281 if (t->ret < 0)
282 return;
283 *pcd->in_loaded = 0; /* FIXME: short writes */
284 return;
285 case CL_RECEIVING:
286 t->ret = client_recv_buffer(pcd);
287 return;
288 }
289
290 }
291
292 int client_open(struct private_client_data *pcd)
293 {
294 int ret;
295 struct hostent *he;
296 struct sockaddr_in their_addr;
297
298 ret = get_host_info(pcd->conf.hostname_arg, &he);
299 if (ret < 0)
300 goto out;
301 /* get new socket */
302 ret = get_socket();
303 if (ret < 0)
304 goto out;
305 pcd->fd = ret;
306 /* init their_addr */
307 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
308 ret = para_connect(pcd->fd, &their_addr);
309 if (ret < 0)
310 goto out;
311 pcd->status = CL_CONNECTED;
312 ret = mark_fd_nonblock(pcd->fd);
313 if (ret < 0)
314 goto out;
315 pcd->task.pre_select = client_pre_select;
316 pcd->task.post_select = client_post_select;
317 pcd->task.private_data = pcd;
318 sprintf(pcd->task.status, "client");
319 register_task(&pcd->task);
320 ret = 1;
321 out:
322 return ret;
323 }