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1 /*
2 * PrintDrop
3 * Copyright (c) 2008, Blue Static <http://www.bluestatic.org>
4 *
5 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU
6 * General Public License as published by the Free Software Foundation; either version 2 of the
7 * License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
10 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along with this program; if not,
14 * write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
15 */
16
17 #import "AppController.h"
18 #import <libssh2.h>
19 #import <sys/socket.h>
20 #import <arpa/inet.h>
21 #include <netdb.h>
22 #include <stdlib.h>
23 #include <WebKit/WebKit.h>
24
25 @interface AppController (Private)
26 - (void)setStatus:(NSString *)msg isError:(BOOL)error;
27
28 - (void)readChannel:(LIBSSH2_CHANNEL *)channel;
29 - (void)uploadAndPrint:(id)sender;
30
31 - (NSString *)getUploadSafeName:(NSString *)name;
32 @end
33
34
35 @implementation AppController
36
37 /**
38 * Set up the printer list
39 */
40 - (id)init
41 {
42 if (self = [super init])
43 {
44 printers = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Printers" ofType:@"plist"]];
45 }
46 return self;
47 }
48
49 /**
50 * Dealloc
51 */
52 - (void)dealloc
53 {
54 [printers release];
55 [super dealloc];
56 }
57
58 /**
59 * Sets the status text
60 */
61 - (void)setStatus:(NSString *)msg isError:(BOOL)error
62 {
63 [status setStringValue:msg];
64 if (error)
65 {
66 [status setTextColor:[NSColor redColor]];
67 [progress stopAnimation:self];
68 }
69 else
70 {
71 [status setTextColor:[NSColor blackColor]];
72 }
73 }
74
75 /**
76 * Awake from NIB
77 */
78 - (void)awakeFromNib
79 {
80 [helpWindow center];
81 NSString *helpPath = [[NSBundle mainBundle] pathForResource:@"Help" ofType:@"html"];
82 [[helpWebView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:helpPath]]];
83
84 [window makeKeyAndOrderFront:self];
85
86 NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
87 NSString *hash = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"CFBundleVersion"];
88 if (![[defaults valueForKey:@"LastVersionHelpWindow"] isEqualToString:hash])
89 {
90 [helpWindow makeKeyAndOrderFront:self];
91 [defaults setObject:hash forKey:@"LastVersionHelpWindow"];
92 }
93 }
94
95 /**
96 * Reads through a channel (in non-blocking) mode until there is no more left to read
97 * and then it returns. This calls sleep(1) so that the channel can have time to process.
98 * Be sure this is threaded otherwis the interface will stall.
99 */
100 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
101 {
102 libssh2_channel_set_blocking(channel, 0);
103
104 char buf[1024];
105 int numbytes;
106 do
107 {
108 memset(&buf, '\0', sizeof(buf));
109 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
110 sleep(1);
111 NSLog(@"SSH buffer: %s", buf);
112 } while (libssh2_poll_channel_read(channel, 0));
113 }
114
115 /**
116 * Sends an item to the printer
117 */
118 - (IBAction)print:(id)sender
119 {
120 [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
121 }
122
123 /**
124 * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
125 * to queue up LPR
126 */
127 - (void)uploadAndPrint:(id)sender
128 {
129 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
130
131 [progress startAnimation:self];
132 [progress setHidden:NO];
133 [status setHidden:NO];
134
135 FILE *localFile;
136 struct stat fileInfo;
137 const char *fileName = [[self getUploadSafeName:[dragRegion filePath]] UTF8String];
138
139 [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
140 struct sockaddr_in sin;
141 int sock = socket(AF_INET, SOCK_STREAM, 0);
142 sin.sin_port = htons(22);
143 sin.sin_family = AF_INET;
144
145 struct hostent *host = gethostbyname("acs.bu.edu");
146 memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
147
148 if (stat([[dragRegion filePath] UTF8String], &fileInfo))
149 {
150 return [self setStatus:@"Invalid file selected" isError:YES];
151 }
152
153 if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
154 {
155 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
156 }
157
158 LIBSSH2_SESSION *ssh = libssh2_session_init();
159 if (ssh == NULL)
160 {
161 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
162 }
163
164 if (libssh2_session_startup(ssh, sock))
165 {
166 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
167 }
168
169 if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
170 {
171 [self setStatus:@"Bad username/password" isError:YES];
172 goto shutdown;
173 }
174
175 LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, fileName, 0755, (unsigned long)fileInfo.st_size);
176 if (!channel)
177 {
178 [self setStatus:@"Unable to open upload SCP session" isError:YES];
179 goto shutdown;
180 }
181
182 [self setStatus:@"Uploading file..." isError:NO];
183
184 localFile = fopen([[dragRegion filePath] UTF8String], "r");
185 char buf[1024];
186 char *pbuf;
187 int numread, numwrote;
188 do
189 {
190 numread = fread(buf, 1, sizeof(buf), localFile);
191 if (numread <= 0)
192 {
193 break;
194 }
195
196 pbuf = buf;
197 do
198 {
199 numwrote = libssh2_channel_write(channel, pbuf, numread);
200 pbuf += numwrote;
201 numread -= numread;
202 } while (numwrote > 0);
203
204 } while(1);
205
206 [self setStatus:@"File uploaded!" isError:NO];
207
208 libssh2_channel_send_eof(channel);
209 libssh2_channel_wait_eof(channel);
210 libssh2_channel_wait_closed(channel);
211 libssh2_channel_free(channel);
212 channel = NULL;
213
214 channel = libssh2_channel_open_session(ssh);
215 if (!channel)
216 {
217 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
218 goto shutdown;
219 }
220
221 if (libssh2_channel_request_pty(channel, "vanilla"))
222 {
223 [self setStatus:@"Could not open ANSI TTY" isError:YES];
224 goto shutdown;
225 }
226
227 if (libssh2_channel_shell(channel))
228 {
229 [self setStatus:@"Failed to open remote shell" isError:YES];
230 goto shutdown;
231 }
232
233 [self setStatus:@"Opened remote SSH shell" isError:NO];
234
235 // read the banner
236 [self readChannel:channel];
237
238 // ACS outage messages --> skip some more
239 char *delay = "q\r\n\0";
240 libssh2_channel_write(channel, delay, sizeof(char) * strlen(delay));
241 [self readChannel:channel];
242
243 // send the job to lpr
244 char *cmd;
245 #ifndef BLU_DEBUG
246 NSString *printer = [[printersController selection] valueForKey:@"unixName"];
247 cmd = (char *)[[NSString stringWithFormat:@"lpr -m -P%@ %s\r\n\0", printer, fileName] UTF8String];
248 #else
249 cmd = "touch __PRINT__\r\n\0";
250 #endif
251 libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
252 [self readChannel:channel];
253
254 // remove our temp file
255 cmd = (char *)[[NSString stringWithFormat:@"rm -f %s\r\n\0", fileName] UTF8String];
256 libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
257 [self readChannel:channel];
258
259 [self setStatus:@"Printed!" isError:NO];
260
261 libssh2_channel_send_eof(channel);
262 libssh2_channel_eof(channel);
263 libssh2_channel_close(channel);
264
265 shutdown:
266 if (channel)
267 {
268 //libssh2_channel_free(channel);
269 channel = NULL;
270 }
271 libssh2_session_disconnect(ssh, "Normal disconnect.");
272 libssh2_session_free(ssh);
273
274 close(sock);
275
276 [progress stopAnimation:self];
277
278 [pool release];
279 }
280
281 /**
282 * Returns an NSString that is safe for uploding onto the server
283 */
284 - (NSString *)getUploadSafeName:(NSString *)name
285 {
286 NSMutableString *n = [NSMutableString stringWithString:name];
287 [n replaceOccurrencesOfString:@" " withString:@"" options:NSBackwardsSearch range:NSMakeRange(0, [name length])];
288 name = (NSString *)n;
289 name = [name lastPathComponent];
290 name = [name stringByDeletingPathExtension];
291 if ([name length] > 20)
292 name = [name substringToIndex:20];
293
294 srandomdev();
295 return [NSString stringWithFormat:@"~/%@.%d.pdf", name, random()];
296 }
297
298 @end