Source/AppController.m

   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
  24 @interface AppController (Private)
  25 - (void)setStatus:(NSString *)msg isError:(BOOL)error;
  26
  27 - (void)readChannel:(LIBSSH2_CHANNEL *)channel;
  28 - (void)uploadAndPrint:(id)sender;
  29
  30 - (NSString *)getUploadSafeName:(NSString *)name;
  31 @end
  32
  33
  34 @implementation AppController
  35
  36 /**
  37  * Set up the printer list
  38  */
  39 - (id)init
  40 {
  41         if (self = [super init])
  42         {
  43                 printers = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Printers" ofType:@"plist"]];
  44                 [NSThread detachNewThreadSelector:@selector(versionCheck:) toTarget:self withObject:self];
  45         }
  46         return self;
  47 }
  48
  49 /**
  50  * Dealloc
  51  */
  52 - (void)dealloc
  53 {
  54         [printers release];
  55         [super dealloc];
  56 }
  57
  58 /**
  59  * Checks and sees if the current version is the most up-to-date one
  60  */
  61 - (void)versionCheck:(id)sender
  62 {
  63         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  64
  65         NSMutableString *version = [NSMutableString stringWithString:[[[NSBundle mainBundle] infoDictionary] valueForKey:@"CFBundleShortVersionString"]];
  66         [version replaceOccurrencesOfString:@" " withString:@"-" options:NSLiteralSearch range:NSMakeRange(0, [version length])];
  67
  68         NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.bluestatic.org/versioncheck.php?prod=printdrop&ver=%@", version]];
  69         NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
  70         NSURLResponse *response;
  71         NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
  72
  73         if (result == nil)
  74         {
  75                 goto end;
  76         }
  77
  78         NSXMLDocument *xml = [[NSXMLDocument alloc] initWithData:result options:0 error:nil];
  79         NSXMLNode *comp = [[xml rootElement] childAtIndex:0];
  80         if ([[comp name] isEqualToString:@"update"])
  81         {
  82                 [updateString setStringValue:[NSString stringWithFormat:[updateString stringValue], [comp stringValue]]];
  83                 [updateWindow makeKeyAndOrderFront:self];
  84         }
  85
  86 end:
  87         [pool release];
  88 }
  89
  90
  91 /**
  92  * Opens the URL to the download page
  93  */
  94 - (IBAction)openUpdateInformation:(id)sender
  95 {
  96         [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://www.bluestatic.org/software/printdrop/"]];
  97 }
  98
  99 /**
 100  * Sets the status text
 101  */
 102 - (void)setStatus:(NSString *)msg isError:(BOOL)error
 103 {
 104         [status setStringValue:msg];
 105         if (error)
 106         {
 107                 [status setTextColor:[NSColor redColor]];
 108                 [progress stopAnimation:self];
 109         }
 110         else
 111         {
 112                 [status setTextColor:[NSColor blackColor]];
 113         }
 114 }
 115
 116 /**
 117  * Reads through a channel (in non-blocking) mode until there is no more left to read
 118  * and then it returns. This calls sleep(1) so that the channel can have time to process.
 119  * Be sure this is threaded otherwis the interface will stall.
 120  */
 121 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
 122 {
 123         libssh2_channel_set_blocking(channel, 0);
 124
 125         char buf[1024];
 126         int numbytes;
 127         do
 128         {
 129                 memset(&buf, '\0', sizeof(buf));
 130                 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
 131                 sleep(1);
 132                 NSLog(@"SSH buffer: %s", buf);
 133         } while (libssh2_poll_channel_read(channel, 0));
 134 }
 135
 136 /**
 137  * Sends an item to the printer
 138  */
 139 - (IBAction)print:(id)sender
 140 {
 141         [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
 142 }
 143
 144 /**
 145  * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
 146  * to queue up LPR
 147  */
 148 - (void)uploadAndPrint:(id)sender
 149 {
 150         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 151
 152         [progress startAnimation:self];
 153         [progress setHidden:NO];
 154         [status setHidden:NO];
 155
 156         FILE *localFile;
 157         struct stat fileInfo;
 158         const char *fileName = [[self getUploadSafeName:[dragRegion filePath]] UTF8String];
 159
 160         [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
 161         struct sockaddr_in sin;
 162         int sock = socket(AF_INET, SOCK_STREAM, 0);
 163         sin.sin_port = htons(22);
 164         sin.sin_family = AF_INET;
 165
 166         struct hostent *host = gethostbyname("acs.bu.edu");
 167         memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
 168
 169         if (stat([[dragRegion filePath] UTF8String], &fileInfo))
 170         {
 171                 return [self setStatus:@"Invalid file selected" isError:YES];
 172         }
 173
 174         if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
 175         {
 176                 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
 177         }
 178
 179         LIBSSH2_SESSION *ssh = libssh2_session_init();
 180         if (ssh == NULL)
 181         {
 182                 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
 183         }
 184
 185         if (libssh2_session_startup(ssh, sock))
 186         {
 187                 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
 188         }
 189
 190         if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
 191         {
 192                 [self setStatus:@"Bad username/password" isError:YES];
 193                 goto shutdown;
 194         }
 195
 196         LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, fileName, 0755, (unsigned long)fileInfo.st_size);
 197         if (!channel)
 198         {
 199                 [self setStatus:@"Unable to open upload SCP session" isError:YES];
 200                 goto shutdown;
 201         }
 202
 203         [self setStatus:@"Uploading file..." isError:NO];
 204
 205         localFile = fopen([[dragRegion filePath] UTF8String], "r");
 206         char buf[1024];
 207         char *pbuf;
 208         int numread, numwrote;
 209         do
 210         {
 211                 numread = fread(buf, 1, sizeof(buf), localFile);
 212                 if (numread <= 0)
 213                 {
 214                         break;
 215                 }
 216
 217                 pbuf = buf;
 218                 do
 219                 {
 220                         numwrote = libssh2_channel_write(channel, pbuf, numread);
 221                         pbuf += numwrote;
 222                         numread -= numread;
 223                 } while (numwrote > 0);
 224
 225         } while(1);
 226
 227         [self setStatus:@"File uploaded!" isError:NO];
 228
 229         libssh2_channel_send_eof(channel);
 230         libssh2_channel_wait_eof(channel);
 231         libssh2_channel_wait_closed(channel);
 232         libssh2_channel_free(channel);
 233         channel = NULL;
 234
 235         channel = libssh2_channel_open_session(ssh);
 236         if (!channel)
 237         {
 238                 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
 239                 goto shutdown;
 240         }
 241
 242         if (libssh2_channel_request_pty(channel, "vanilla"))
 243         {
 244                 [self setStatus:@"Could not open ANSI TTY" isError:YES];
 245                 goto shutdown;
 246         }
 247
 248         if (libssh2_channel_shell(channel))
 249         {
 250                 [self setStatus:@"Failed to open remote shell" isError:YES];
 251                 goto shutdown;
 252         }
 253
 254         [self setStatus:@"Opened remote SSH shell" isError:NO];
 255
 256         // read the banner
 257         [self readChannel:channel];
 258
 259         // ACS outage messages --> skip some more
 260         char *delay = "q\r\n\0";
 261         libssh2_channel_write(channel, delay, sizeof(char) * strlen(delay));
 262         [self readChannel:channel];
 263
 264         // send the job to lpr
 265         char *cmd;
 266 #ifndef BLU_DEBUG
 267         NSString *printer = [[printersController selection] valueForKey:@"unixName"];
 268         cmd = (char *)[[NSString stringWithFormat:@"lpr -m -P%@ %s\r\n\0", printer, fileName] UTF8String];
 269 #else
 270         cmd = "touch __PRINT__\r\n\0";
 271 #endif
 272         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 273         [self readChannel:channel];
 274
 275         // remove our temp file
 276         cmd = (char *)[[NSString stringWithFormat:@"rm -f %s\r\n\0", fileName] UTF8String];
 277         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 278         [self readChannel:channel];
 279
 280         [self setStatus:@"Printed!" isError:NO];
 281
 282         libssh2_channel_send_eof(channel);
 283         libssh2_channel_eof(channel);
 284         libssh2_channel_close(channel);
 285
 286 shutdown:
 287         if (channel)
 288         {
 289                 //libssh2_channel_free(channel);
 290                 channel = NULL;
 291         }
 292         libssh2_session_disconnect(ssh, "Normal disconnect.");
 293         libssh2_session_free(ssh);
 294
 295         close(sock);
 296
 297         [progress stopAnimation:self];
 298
 299         [pool release];
 300 }
 301
 302 /**
 303  * Returns an NSString that is safe for uploding onto the server
 304  */
 305 - (NSString *)getUploadSafeName:(NSString *)name
 306 {
 307         NSMutableString *n = [NSMutableString stringWithString:name];
 308         [n replaceOccurrencesOfString:@" " withString:@"" options:NSBackwardsSearch range:NSMakeRange(0, [name length])];
 309         name = (NSString *)n;
 310         name = [name lastPathComponent];
 311         name = [name stringByDeletingPathExtension];
 312         if ([name length] > 20)
 313                 name = [name substringToIndex:20];
 314
 315         srandomdev();
 316         return [NSString stringWithFormat:@"~/%@.%d.pdf", name, random()];
 317 }
 318
 319 @end