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 #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