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
  23 @interface AppController (Private)
  24
  25 - (void)setStatus:(NSString *)msg isError:(BOOL)error;
  26
  27 - (void)readChannel:(LIBSSH2_CHANNEL *)channel;
  28 - (void)uploadAndPrint:(id)sender;
  29
  30 @end
  31
  32
  33 @implementation AppController
  34
  35 /**
  36  * Set up the printer list
  37  */
  38 - (id)init
  39 {
  40         if (self = [super init])
  41         {
  42                 printers = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Printers" ofType:@"plist"]];
  43                 [NSThread detachNewThreadSelector:@selector(versionCheck:) toTarget:self withObject:self];
  44         }
  45         return self;
  46 }
  47
  48 /**
  49  * Checks and sees if the current version is the most up-to-date one
  50  */
  51 - (void)versionCheck:(id)sender
  52 {
  53         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  54
  55         NSMutableString *version = [NSMutableString stringWithString:[[[NSBundle mainBundle] infoDictionary] valueForKey:@"CFBundleShortVersionString"]];
  56         version = [NSMutableString stringWithString:@"1.0 Beta 1"];
  57         [version replaceOccurrencesOfString:@" " withString:@"-" options:NSLiteralSearch range:NSMakeRange(0, [version length])];
  58
  59         NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://www.bluestatic.org/versioncheck.php?prod=printdrop&ver=%@", version]];
  60         NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:10];
  61         NSURLResponse *response;
  62         NSData *result = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];
  63
  64         if (result == nil)
  65         {
  66                 goto end;
  67         }
  68
  69         NSXMLDocument *xml = [[NSXMLDocument alloc] initWithData:result options:0 error:nil];
  70         NSXMLNode *comp = [[xml rootElement] childAtIndex:0];
  71         if ([[comp name] isEqualToString:@"update"])
  72         {
  73                 [updateString setStringValue:[NSString stringWithFormat:[updateString stringValue], [comp stringValue]]];
  74                 [updateWindow makeKeyAndOrderFront:self];
  75         }
  76
  77 end:
  78         [pool release];
  79 }
  80
  81
  82 /**
  83  * Opens the URL to the download page
  84  */
  85 - (IBAction)openUpdateInformation:(id)sender
  86 {
  87         [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://www.bluestatic.org/software/printdrop/"]];
  88 }
  89
  90 /**
  91  * Sets the status text
  92  */
  93 - (void)setStatus:(NSString *)msg isError:(BOOL)error
  94 {
  95         [status setStringValue:msg];
  96         if (error)
  97         {
  98                 [status setTextColor:[NSColor redColor]];
  99                 [progress stopAnimation:self];
 100         }
 101         else
 102         {
 103                 [status setTextColor:[NSColor blackColor]];
 104         }
 105 }
 106
 107 /**
 108  * Reads through a channel (in non-blocking) mode until there is no more left to read
 109  * and then it returns. This calls sleep(1) so that the channel can have time to process.
 110  * Be sure this is threaded otherwis the interface will stall.
 111  */
 112 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
 113 {
 114         libssh2_channel_set_blocking(channel, 0);
 115
 116         char buf[1024];
 117         int numbytes;
 118         do
 119         {
 120                 memset(&buf, '\0', sizeof(buf));
 121                 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
 122                 sleep(1);
 123 #ifdef BLU_DEBUG
 124                 NSLog(@"buf: %s", buf);
 125 #endif
 126         } while (libssh2_poll_channel_read(channel, 0));
 127 }
 128
 129 /**
 130  * Sends an item to the printer
 131  */
 132 - (IBAction)print:(id)sender
 133 {
 134         [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
 135 }
 136
 137 /**
 138  * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
 139  * to queue up LPR
 140  */
 141 - (void)uploadAndPrint:(id)sender
 142 {
 143         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 144
 145         [progress startAnimation:self];
 146         [progress setHidden:NO];
 147         [status setHidden:NO];
 148
 149         FILE *localFile;
 150         struct stat fileInfo;
 151
 152         [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
 153         struct sockaddr_in sin;
 154         int sock = socket(AF_INET, SOCK_STREAM, 0);
 155         sin.sin_port = htons(22);
 156         sin.sin_family = AF_INET;
 157
 158         struct hostent *host = gethostbyname("acs.bu.edu");
 159         memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
 160
 161         if (stat([[dragRegion filePath] UTF8String], &fileInfo))
 162         {
 163                 return [self setStatus:@"Invalid file selected" isError:YES];
 164         }
 165
 166         if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
 167         {
 168                 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
 169         }
 170
 171         LIBSSH2_SESSION *ssh = libssh2_session_init();
 172         if (ssh == NULL)
 173         {
 174                 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
 175         }
 176
 177         if (libssh2_session_startup(ssh, sock))
 178         {
 179                 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
 180         }
 181
 182         if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
 183         {
 184                 [self setStatus:@"Bad username/password" isError:YES];
 185                 goto shutdown;
 186         }
 187
 188         LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, "~/__bu_print_drop__.pdf", 0755, (unsigned long)fileInfo.st_size);
 189         if (!channel)
 190         {
 191                 [self setStatus:@"Unable to open upload SCP session" isError:YES];
 192                 goto shutdown;
 193         }
 194
 195         [self setStatus:@"Uploading file..." isError:NO];
 196
 197         localFile = fopen([[dragRegion filePath] UTF8String], "r");
 198         char buf[1024];
 199         char *pbuf;
 200         int numread, numwrote;
 201         do
 202         {
 203                 numread = fread(buf, 1, sizeof(buf), localFile);
 204                 if (numread <= 0)
 205                 {
 206                         break;
 207                 }
 208
 209                 pbuf = buf;
 210                 do
 211                 {
 212                         numwrote = libssh2_channel_write(channel, pbuf, numread);
 213                         pbuf += numwrote;
 214                         numread -= numread;
 215                 } while (numwrote > 0);
 216
 217         } while(1);
 218
 219         [self setStatus:@"File uploaded!" isError:NO];
 220
 221         libssh2_channel_send_eof(channel);
 222         libssh2_channel_wait_eof(channel);
 223         libssh2_channel_wait_closed(channel);
 224         libssh2_channel_free(channel);
 225         channel = NULL;
 226
 227         channel = libssh2_channel_open_session(ssh);
 228         if (!channel)
 229         {
 230                 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
 231                 goto shutdown;
 232         }
 233
 234         if (libssh2_channel_request_pty(channel, "vanilla"))
 235         {
 236                 [self setStatus:@"Could not open ANSI TTY" isError:YES];
 237                 goto shutdown;
 238         }
 239
 240         if (libssh2_channel_shell(channel))
 241         {
 242                 [self setStatus:@"Failed to open remote shell" isError:YES];
 243                 goto shutdown;
 244         }
 245
 246         [self setStatus:@"Opened remote SSH shell" isError:NO];
 247
 248         // read the banner
 249         [self readChannel:channel];
 250
 251         // send the job to lpr
 252         char *cmd;
 253 #ifndef BLU_DEBUG
 254         NSString *printer = [[printersController selection] valueForKey:@"unixName"];
 255         cmd = (char *)[[NSString stringWithFormat:@"lpr -m -P%@ __bu_print_drop__.pdf\r\n\0", printer] UTF8String];
 256 #else
 257         cmd = "touch abc.def\r\n\0";
 258 #endif
 259         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 260         [self readChannel:channel];
 261
 262         // remove our temp file
 263         cmd = "rm -f __bu_print_drop__.pdf\r\n\0";
 264         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 265         [self readChannel:channel];
 266
 267         [self setStatus:@"Printed!" isError:NO];
 268
 269         libssh2_channel_send_eof(channel);
 270         libssh2_channel_eof(channel);
 271         libssh2_channel_close(channel);
 272
 273 shutdown:
 274         if (channel)
 275         {
 276                 //libssh2_channel_free(channel);
 277                 channel = NULL;
 278         }
 279         libssh2_session_disconnect(ssh, "Normal disconnect.");
 280         libssh2_session_free(ssh);
 281
 282         close(sock);
 283
 284         [progress stopAnimation:self];
 285
 286         [pool release];
 287 }
 288
 289 @end