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.c the client program used to connect to para_server */
25 #include "client.cmdline.h"
28 #include <openssl/rc4.h>
40 CL_RECEIVED_CHALLENGE,
45 CL_RECEIVING_SERVER_OUTPUT
48 #define CLIENT_BUFSIZE 8192
50 struct private_client_data {
53 struct client_args_info conf;
61 char buf[CLIENT_BUFSIZE];
65 long unsigned challenge_nr;
66 /* only used if stdin gets sent to para_server */
74 static struct private_client_data *pcd;
75 static struct stdin_task sit;
76 static struct stdout_task sot;
79 static void rc4_send(unsigned long len, const unsigned char *indata,
80 unsigned char *outdata)
82 RC4(&pcd->rc4_send_key, len, indata, outdata);
85 static void rc4_recv(unsigned long len, const unsigned char *indata,
86 unsigned char *outdata)
88 RC4(&pcd->rc4_recv_key, len, indata, outdata);
95 void para_log(int ll, const char* fmt,...)
99 /* ignore log message if loglevel is not high enough */
100 if (pcd && ll < pcd->conf.loglevel_arg)
103 vfprintf(stderr, fmt, argp);
107 static void client_close(struct private_client_data *pcd)
114 free(pcd->config_file);
119 static int client_parse_config(int argc, char *argv[],
120 struct private_client_data **pcd_ptr)
122 char *home = para_homedir();
125 struct private_client_data *p =
126 para_calloc(sizeof(struct private_client_data));
129 cmdline_parser(argc, argv, &p->conf);
130 ret = - E_CLIENT_SYNTAX;
131 if (!p->conf.inputs_num)
133 p->user = p->conf.user_given?
134 para_strdup(p->conf.user_arg) : para_logname();
136 p->key_file = p->conf.key_file_given?
137 para_strdup(p->conf.key_file_arg) :
138 make_message("%s/.paraslash/key.%s", home, p->user);
140 p->config_file = p->conf.config_file_given?
141 para_strdup(p->conf.config_file_arg) :
142 make_message("%s/.paraslash/client.conf", home);
143 ret = stat(p->config_file, &statbuf);
144 if (ret && p->conf.config_file_given) {
149 cmdline_parser_configfile(p->config_file, &p->conf, 0, 0, 0);
153 "current loglevel: %d\n"
154 "using config_file: %s\n"
155 "using key_file: %s\n"
156 "connecting to %s:%d\n" ,
157 p->conf.loglevel_arg,
160 p->conf.hostname_arg, p->conf.server_port_arg
169 static void client_pre_select(struct sched *s, struct task *t)
171 struct private_client_data *p = t->private_data;
173 PARA_INFO_LOG("status %d\n", p->status);
179 switch (pcd->status) {
182 case CL_SENT_CH_RESPONSE:
183 case CL_SENT_COMMAND:
184 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
188 case CL_RECEIVED_WELCOME:
189 case CL_RECEIVED_CHALLENGE:
190 case CL_RECEIVED_PROCEED:
191 para_fd_set(pcd->fd, &s->wfds, &s->max_fileno);
195 case CL_RECEIVING_SERVER_OUTPUT:
196 if (pcd->loaded < CLIENT_BUFSIZE - 1) {
197 para_fd_set(pcd->fd, &s->rfds, &s->max_fileno);
201 case CL_SENDING_STDIN:
203 PARA_INFO_LOG("loaded: %d\n", *p->in_loaded);
204 para_fd_set(p->fd, &s->wfds, &s->max_fileno);
208 t->ret = -E_INPUT_EOF;
209 s->timeout.tv_sec = 0;
210 s->timeout.tv_usec = 1;
217 static ssize_t client_recv_buffer(struct private_client_data *p)
219 ssize_t ret = recv_buffer(p->fd, p->buf + p->loaded,
220 CLIENT_BUFSIZE - p->loaded);
222 return -E_SERVER_EOF;
229 static void client_post_select(struct sched *s, struct task *t)
231 struct private_client_data *p = t->private_data;
233 PARA_INFO_LOG("status %d\n", p->status);
237 if (!p->check_r && !p->check_w)
239 if (p->check_r && !FD_ISSET(p->fd, &s->rfds))
241 if (p->check_w && !FD_ISSET(p->fd, &s->wfds))
244 case CL_CONNECTED: /* receive welcome message */
245 t->ret = client_recv_buffer(p);
247 p->status = CL_RECEIVED_WELCOME;
249 case CL_RECEIVED_WELCOME: /* send auth command */
250 sprintf(p->buf, "auth %s%s", p->conf.plain_given?
251 "" : "rc4 ", p->user);
252 PARA_INFO_LOG("--> %s\n", p->buf);
253 t->ret = send_buffer(p->fd, p->buf);
255 p->status = CL_SENT_AUTH;
257 case CL_SENT_AUTH: /* receive challenge number */
259 t->ret = client_recv_buffer(p);
263 t->ret = -E_INVALID_CHALLENGE;
264 PARA_ERROR_LOG("received the following: %s\n", p->buf);
267 PARA_INFO_LOG("%s", "<-- [challenge]\n");
268 /* decrypt challenge number */
269 t->ret = para_decrypt_challenge(p->key_file, &p->challenge_nr,
270 (unsigned char *) p->buf, 64);
272 p->status = CL_RECEIVED_CHALLENGE;
274 case CL_RECEIVED_CHALLENGE: /* send decrypted challenge */
275 PARA_INFO_LOG("--> %lu\n", p->challenge_nr);
276 t->ret = send_va_buffer(p->fd, "%s%lu", CHALLENGE_RESPONSE_MSG,
279 p->status = CL_SENT_CH_RESPONSE;
281 case CL_SENT_CH_RESPONSE: /* read server response */
283 size_t bytes_received;
284 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
286 t->ret = client_recv_buffer(p);
289 bytes_received = t->ret;
290 PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
291 "info ++++\n", p->buf);
292 /* check if server has sent "Proceed" message */
293 t->ret = -E_CLIENT_AUTH;
294 if (!strstr(p->buf, PROCEED_MSG))
297 p->status = CL_RECEIVED_PROCEED;
298 if (bytes_received < PROCEED_MSG_LEN + 32)
300 PARA_INFO_LOG("%s", "decrypting session key\n");
301 t->ret = para_decrypt_buffer(p->key_file, rc4_buf,
302 (unsigned char *)p->buf + PROCEED_MSG_LEN + 1,
303 bytes_received - PROCEED_MSG_LEN - 1);
306 RC4_set_key(&p->rc4_send_key, RC4_KEY_LEN, rc4_buf);
307 RC4_set_key(&p->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
308 enable_crypt(p->fd, rc4_recv, rc4_send);
310 case CL_RECEIVED_PROCEED: /* concat args and send command */
313 char *command = NULL;
314 for (i = 0; i < p->conf.inputs_num; i++) {
316 command = make_message("%s\n%s", command?
317 command : "", p->conf.inputs[i]);
320 command = para_strcat(command, EOC_MSG "\n");
321 PARA_INFO_LOG("--> %s\n", command);
322 t->ret = send_buffer(p->fd, command);
325 p->status = CL_SENT_COMMAND;
328 case CL_SENT_COMMAND:
330 t->ret = client_recv_buffer(p);
333 t->ret = -E_HANDSHAKE_COMPLETE;
334 if (strstr(p->buf, AWAITING_DATA_MSG))
335 p->status = CL_SENDING_STDIN;
337 p->status = CL_RECEIVING_SERVER_OUTPUT;
339 case CL_SENDING_STDIN: /* FIXME: might block */
340 PARA_INFO_LOG("loaded: %d\n", *p->in_loaded);
341 t->ret = send_bin_buffer(p->fd, p->inbuf, *p->in_loaded);
347 *p->in_loaded = 0; /* FIXME: short writes */
349 case CL_RECEIVING_SERVER_OUTPUT:
350 t->ret = client_recv_buffer(p);
355 static int client_open(struct private_client_data *pcd)
359 struct sockaddr_in their_addr;
361 /* get the host info */
362 PARA_NOTICE_LOG("getting host info of %s\n",
363 pcd->conf.hostname_arg);
364 ret = get_host_info(pcd->conf.hostname_arg, &he);
372 /* init their_addr */
373 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
375 PARA_NOTICE_LOG("connecting to %s\n", pcd->conf.hostname_arg);
376 ret = para_connect(pcd->fd, &their_addr);
379 pcd->status = CL_CONNECTED;
380 pcd->task.pre_select = client_pre_select;
381 pcd->task.post_select = client_post_select;
382 pcd->task.private_data = pcd;
383 sprintf(pcd->task.status, "client");
384 register_task(&pcd->task);
390 static void client_event_handler(struct task *t)
392 struct private_client_data *p = t->private_data;
394 PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
395 if (t->ret != -E_HANDSHAKE_COMPLETE) {
400 if (p->status == CL_SENDING_STDIN) {
401 stdin_set_defaults(&sit);
402 sit.buf = para_malloc(sit.bufsize),
403 register_task(&sit.task);
405 p->in_loaded = &sit.loaded;
406 p->in_eof = &sit.eof;
409 stdout_set_defaults(&sot);
411 sot.loaded = &p->loaded;
412 sot.input_eof = &p->eof;
413 register_task(&sot.task);
419 int main(int argc, char *argv[])
425 s.default_timeout.tv_sec = 1;
426 s.default_timeout.tv_usec = 0;
427 ret = client_parse_config(argc, argv, &pcd);
430 pcd->task.event_handler = client_event_handler;
431 ret = client_open(pcd);
438 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
439 return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;