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 */
23 #include "client.cmdline.h"
26 #include <openssl/rc4.h>
31 enum {CL_CONNECTED, CL_SENT_AUTH, CL_RECEIVED_CHALLENGE, CL_SENT_CH_RESPONSE,
32 CL_RECEIVED_PROCEED, CL_SENT_COMMAND, CL_SENDING_STDIN, CL_RECV_DATA};
34 struct private_client_data {
37 struct client_args_info conf;
52 static struct private_client_data *pcd;
54 static void rc4_send(unsigned long len, const unsigned char *indata,
55 unsigned char *outdata)
57 RC4(&pcd->rc4_send_key, len, indata, outdata);
60 static void rc4_recv(unsigned long len, const unsigned char *indata,
61 unsigned char *outdata)
63 RC4(&pcd->rc4_recv_key, len, indata, outdata);
70 void para_log(int ll, const char* fmt,...)
74 /* ignore log message if loglevel is not high enough */
75 if (pcd && ll < pcd->conf.loglevel_arg)
78 vfprintf(stderr, fmt, argp);
82 static void client_close(struct private_client_data *pcd)
89 free(pcd->config_file);
94 static void append_str(char **data, const char* append)
97 char *tmp = make_message("%s\n%s", *data, append);
101 *data = para_strdup(append);
104 static int client_parse_config(int argc, char *argv[],
105 struct private_client_data **pcd_ptr)
107 char *home = para_homedir();
110 struct private_client_data *p =
111 para_calloc(sizeof(struct private_client_data));
114 cmdline_parser(argc, argv, &p->conf);
115 ret = - E_CLIENT_SYNTAX;
116 if (!p->conf.inputs_num)
118 p->user = p->conf.user_given?
119 para_strdup(p->conf.user_arg) : para_logname();
121 p->key_file = p->conf.key_file_given?
122 para_strdup(p->conf.key_file_arg) :
123 make_message("%s/.paraslash/key.%s", home, p->user);
125 p->config_file = p->conf.config_file_given?
126 para_strdup(p->conf.config_file_arg) :
127 make_message("%s/.paraslash/client.conf", home);
128 ret = stat(p->config_file, &statbuf);
129 if (ret && p->conf.config_file_given) {
134 cmdline_parser_configfile(p->config_file, &p->conf, 0, 0, 0);
145 static int send_stdin(int fd)
150 PARA_NOTICE_LOG("%s", "sending stdin\n");
152 ret = read(STDIN_FILENO, buf, sizeof(buf));
155 ret = send_bin_buffer(fd, buf, ret);
162 static int client_open(struct private_client_data *pcd)
166 struct sockaddr_in their_addr;
168 /* get the host info */
169 PARA_NOTICE_LOG("getting host info of %s\n",
170 pcd->conf.hostname_arg);
171 ret = get_host_info(pcd->conf.hostname_arg, &he);
179 /* init their_addr */
180 init_sockaddr(&their_addr, pcd->conf.server_port_arg, he);
182 PARA_NOTICE_LOG("connecting to %s\n", pcd->conf.hostname_arg);
183 ret = para_connect(pcd->fd, &their_addr);
195 int main(int argc, char *argv[])
198 int numbytes, i, received, ret;
200 struct sockaddr_in their_addr;
201 char *command = NULL;
204 long unsigned challenge_nr;
205 unsigned char rc4_buf[2 * RC4_KEY_LEN] = "";
207 ret = client_parse_config(argc, argv, &pcd);
210 if (pcd->conf.loglevel_arg <= NOTICE)
211 cmdline_parser_print_version();
213 "current loglevel: %d\n"
214 "using config_file: %s\n"
215 "using key_file: %s\n"
216 "connecting to %s:%d\n",
217 pcd->conf.loglevel_arg,
220 pcd->conf.hostname_arg,
221 pcd->conf.server_port_arg
223 ret = client_open(pcd);
226 /* receive welcome message */
227 ret = recv_buffer(pcd->fd, buf, sizeof(buf));
230 /* send auth command */
231 auth_str = make_message("auth %s%s", pcd->conf.plain_given? "" : "rc4 ",
233 PARA_INFO_LOG("<-- %s--> %s\n", buf, auth_str);
234 ret = send_buffer(pcd->fd, auth_str);
237 /* receive challenge number */
238 ret = recv_buffer(pcd->fd, buf, sizeof(buf));
242 ret = -E_INVALID_CHALLENGE;
243 PARA_ERROR_LOG("received the following: %s\n", buf);
246 PARA_INFO_LOG("%s", "<-- [challenge]\n");
247 /* decrypt challenge number */
248 ret = para_decrypt_challenge(pcd->key_file, &challenge_nr,
249 (unsigned char *) buf, 64);
252 /* send decrypted challenge */
253 PARA_INFO_LOG("--> %lu\n", challenge_nr);
254 ret = send_va_buffer(pcd->fd, "%s%lu", CHALLENGE_RESPONSE_MSG, challenge_nr);
257 /* wait for approval */
258 PARA_NOTICE_LOG("%s", "waiting for approval from server\n");
259 ret = recv_buffer(pcd->fd, buf, sizeof(buf));
263 PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
265 /* check if server has sent "Proceed" message */
266 ret = -E_CLIENT_AUTH;
267 if (!strstr(buf, PROCEED_MSG))
269 if (numbytes >= PROCEED_MSG_LEN + 32) {
270 PARA_INFO_LOG("%s", "decrypting session key\n");
271 ret = para_decrypt_buffer(pcd->key_file, rc4_buf,
272 (unsigned char *)buf + PROCEED_MSG_LEN + 1,
273 numbytes - PROCEED_MSG_LEN - 1);
276 RC4_set_key(&pcd->rc4_send_key, RC4_KEY_LEN, rc4_buf);
277 RC4_set_key(&pcd->rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
278 PARA_INFO_LOG("rc4 encryption activated: %x:%x:%x:%x\n",
279 rc4_buf[0], rc4_buf[1], rc4_buf[2], rc4_buf[3]);
280 enable_crypt(pcd->fd, rc4_recv, rc4_send);
283 for (i = 0; i < pcd->conf.inputs_num; i++)
284 append_str(&command, pcd->conf.inputs[i]);
286 PARA_INFO_LOG("--> %s\n", command);
287 ret = send_buffer(pcd->fd, command);
292 ret = send_buffer(pcd->fd, EOC_MSG "\n");
295 PARA_NOTICE_LOG("%s", "command sent.\n");
298 ret = recv_bin_buffer(pcd->fd, buf, sizeof(buf) - 1);
301 PARA_NOTICE_LOG("%s", "connection closed by peer\n");
306 if (!received && strstr(buf, AWAITING_DATA_MSG)) {
307 ret = send_stdin(pcd->fd);
311 ret = write(STDOUT_FILENO, buf, numbytes);
312 if (ret != numbytes) {
313 ret = -E_SHORT_CLIENT_WRITE;
320 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
321 return ret >= 0? EXIT_SUCCESS: EXIT_FAILURE;