grab: use grab_client_cmdline_parser_string()
[paraslash.git] / client.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.c the client program used to connect to para_server */
20
21 #include "para.h"
22 #include "config.h"
23 #include "client.cmdline.h"
24 #include "crypt.h"
25 #include "rc4.h"
26 #include <openssl/rc4.h>
27 #include "net.h"
28 #include "string.h"
29
30 struct gengetopt_args_info args_info;
31
32 /*
33 * client log function
34 */
35 void para_log(int ll, const char* fmt,...)
36 {
37 va_list argp;
38 FILE *outfd;
39
40 /* ignore log message if loglevel is not high enough */
41 if (ll < args_info.loglevel_arg)
42 return;
43 if (ll < WARNING)
44 outfd = stdout;
45 else
46 outfd = stderr;
47 va_start(argp, fmt);
48 vfprintf(stdout, fmt, argp);
49 va_end(argp);
50 }
51
52 void get_options(int argc, char *argv[],
53 char **config_file, char **key_file)
54 {
55 char *home;
56 static char default_key_file[_POSIX_PATH_MAX] = "";
57 static char default_config_file[_POSIX_PATH_MAX] = "";
58 struct stat statbuf;
59 int ret;
60
61 cmdline_parser(argc, argv, &args_info);
62 if (!args_info.user_given)
63 args_info.user_arg = para_logname();
64 if (!args_info.key_file_given) {
65 home = para_homedir();
66 sprintf(default_key_file, "%s/.paraslash/key.%s", home,
67 args_info.user_arg);
68 free(home);
69 }
70 if (!args_info.config_file_given) {
71 home = para_homedir();
72 sprintf(default_config_file, "%s/.paraslash/client.conf",
73 home);
74 free(home);
75 }
76 if (!args_info.config_file_given)
77 *config_file = default_config_file;
78 else
79 *config_file = args_info.config_file_arg;
80 ret = stat(*config_file, &statbuf);
81 if (ret && args_info.config_file_given) {
82 fprintf(stderr, "can not stat config file %s\n",
83 args_info.config_file_arg);
84 exit(EXIT_FAILURE);
85 }
86 if (!ret)
87 cmdline_parser_configfile(*config_file, &args_info, 0, 0, 0);
88 if (!args_info.key_file_given)
89 *key_file = default_key_file;
90 else
91 *key_file = args_info.key_file_arg;
92 }
93
94 static RC4_KEY rc4_recv_key;
95 static RC4_KEY rc4_send_key;
96 static unsigned char rc4_buf[2 * RC4_KEY_LEN];
97
98 static void rc4_send(unsigned long len, const unsigned char *indata, unsigned char *outdata)
99 {
100 RC4(&rc4_send_key, len, indata, outdata);
101 }
102
103 static void rc4_recv(unsigned long len, const unsigned char *indata, unsigned char *outdata)
104 {
105 RC4(&rc4_recv_key, len, indata, outdata);
106 }
107 void (*crypt_function_recv)(unsigned long len, const unsigned char *indata, unsigned char *outdata);
108 void (*crypt_function_send)(unsigned long len, const unsigned char *indata, unsigned char *outdata);
109
110
111 static void append_str(char **data, const char* append)
112 {
113 if (*data) {
114 char *tmp = make_message("%s\n%s", *data, append);
115 free(*data);
116 *data = tmp;
117 } else
118 *data = para_strdup(append);
119 }
120
121 /*
122 * MAIN
123 */
124 int main(int argc, char *argv[])
125 {
126
127 int sockfd, numbytes, i, received, ret;
128 struct hostent *he;
129 struct sockaddr_in their_addr;
130 char *command = NULL;
131 char buf[8192];
132 char *auth_str;
133 char *key_file, *config_file;
134 long unsigned challenge_nr;
135
136 get_options(argc, argv, &config_file, &key_file);
137 if (args_info.loglevel_arg <= NOTICE)
138 cmdline_parser_print_version();
139 PARA_INFO_LOG(
140 "current loglevel: %d\n"
141 "using config_file: %s\n"
142 "using key_file: %s\n"
143 "connecting to %s:%d\n",
144 args_info.loglevel_arg,
145 config_file,
146 key_file,
147 args_info.hostname_arg,
148 args_info.server_port_arg
149 );
150 if (!args_info.inputs_num) {
151 PARA_ERROR_LOG("%s", "syntax error\n");
152 exit(EXIT_FAILURE);
153 }
154 /* concat args */
155 for (i = 0; i < args_info.inputs_num; i++)
156 append_str(&command, args_info.inputs[i]);
157
158 crypt_function_recv = NULL;
159 crypt_function_send = NULL;
160 /* get the host info */
161 PARA_NOTICE_LOG("getting host info of %s\n",
162 args_info.hostname_arg);
163 if (!(he = get_host_info(args_info.hostname_arg)))
164 exit(EXIT_FAILURE);
165 /* get new socket */
166 if ((sockfd = get_socket()) < 0)
167 exit(EXIT_FAILURE);
168 /* init their_addr */
169 init_sockaddr(&their_addr, args_info.server_port_arg, he);
170 /* Connect */
171 PARA_NOTICE_LOG("connecting to %s...\n",
172 args_info.hostname_arg);
173 if (para_connect(sockfd, &their_addr) < 0)
174 exit(EXIT_FAILURE);
175 /* Receive Welcome message */
176 if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
177 exit(EXIT_FAILURE);
178 /* send auth command */
179 auth_str = make_message("auth %s%s", args_info.plain_given? "" : "rc4 ",
180 args_info.user_arg);
181 PARA_INFO_LOG("<-- %s--> %s\n", buf, auth_str);
182 if (send_buffer(sockfd, auth_str) < 0)
183 exit(EXIT_FAILURE);
184 /* receive challenge number */
185 if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
186 exit(EXIT_FAILURE);
187 if (numbytes != 64) {
188 PARA_EMERG_LOG("did not receive valid challenge (got %i bytes)\n",
189 numbytes);
190 buf[numbytes] = '\0';
191 PARA_ERROR_LOG("received the following instead: %s\n", buf);
192 exit(EXIT_FAILURE);
193 }
194 PARA_INFO_LOG("<-- [challenge (%i bytes)]\n", numbytes);
195 /* decrypt challenge number */
196 ret = para_decrypt_challenge(key_file, &challenge_nr, (unsigned char *) buf,
197 numbytes);
198 if (ret < 0) {
199 PARA_EMERG_LOG("decrypt error (%d). Bad secret key?\n", ret);
200 exit(EXIT_FAILURE);
201 }
202 /* send decrypted challenge */
203 PARA_INFO_LOG("--> %lu\n", challenge_nr);
204 if (send_va_buffer(sockfd, "%s%lu", CHALLENGE_RESPONSE_MSG, challenge_nr) < 0)
205 exit(EXIT_FAILURE);
206 /* Wait for approval */
207 PARA_NOTICE_LOG("%s", "waiting for approval from server\n");
208 if ((numbytes = recv_buffer(sockfd, buf, sizeof(buf))) < 0)
209 exit(EXIT_FAILURE);
210 PARA_INFO_LOG("++++ server info ++++\n%s\n++++ end of server "
211 "info ++++\n", buf);
212 /* Check if server has sent "Proceed" message */
213 if (!strstr(buf, PROCEED_MSG)) {
214 PARA_EMERG_LOG("%s", "authentication failed\n");
215 exit(EXIT_FAILURE);
216 }
217 if (numbytes >= PROCEED_MSG_LEN + 32) {
218 PARA_INFO_LOG("%s", "decrypting session key\n");
219 if (para_decrypt_buffer(key_file, rc4_buf,
220 (unsigned char *)buf + PROCEED_MSG_LEN + 1,
221 numbytes - PROCEED_MSG_LEN - 1) < 0) {
222 PARA_EMERG_LOG("%s", "error receiving rc4 key\n");
223 exit(EXIT_FAILURE);
224 }
225 RC4_set_key(&rc4_send_key, RC4_KEY_LEN, rc4_buf);
226 RC4_set_key(&rc4_recv_key, RC4_KEY_LEN, rc4_buf + RC4_KEY_LEN);
227 PARA_INFO_LOG("rc4 encrytion activated: %x:%x:%x:%x\n",
228 rc4_buf[0], rc4_buf[1], rc4_buf[2], rc4_buf[3]);
229 crypt_function_recv = rc4_recv;
230 crypt_function_send = rc4_send;
231 }
232 /* send command */
233 PARA_INFO_LOG("--> %s\n", command);
234 if (send_buffer(sockfd, command) < 0)
235 exit(EXIT_FAILURE);
236 free(command);
237 command = NULL;
238 if (send_buffer(sockfd, EOC_MSG "\n") < 0)
239 exit(EXIT_FAILURE);
240 PARA_NOTICE_LOG("%s", "command sent.\n");
241 received = 0;
242 while ((numbytes = recv_bin_buffer(sockfd, buf, sizeof(buf) - 1)) > 0) {
243 buf[numbytes] = '\0';
244 if (!received && strstr(buf, AWAITING_DATA_MSG)) {
245 PARA_NOTICE_LOG("%s", "sending stdin\n");
246 while ((ret = read(STDIN_FILENO, buf,
247 sizeof(buf))) > 0) {
248 if (send_bin_buffer(sockfd, buf, ret) < 0)
249 break;
250 }
251 PARA_NOTICE_LOG("%s", "closing connection\n");
252 numbytes = 1;
253 break;
254 }
255 received = 1;
256 if (write(STDOUT_FILENO, buf, numbytes) != numbytes)
257 break;
258 }
259 if (!numbytes)
260 PARA_NOTICE_LOG("%s", "connection closed by peer\n");
261 close(sockfd);
262 return ret >= 0? 0: 1;
263 }