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