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
  85 /**
  86  * Reads through a channel (in non-blocking) mode until there is no more left to read
  87  * and then it returns. This calls sleep(1) so that the channel can have time to process.
  88  * Be sure this is threaded otherwis the interface will stall.
  89  */
  90 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
  91 {
  92         libssh2_channel_set_blocking(channel, 0);
  93
  94         char buf[1024];
  95         int numbytes;
  96         do
  97         {
  98                 memset(&buf, '\0', sizeof(buf));
  99                 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
 100                 sleep(1);
 101                 NSLog(@"SSH buffer: %s", buf);
 102         } while (libssh2_poll_channel_read(channel, 0));
 103 }
 104
 105 /**
 106  * Sends an item to the printer
 107  */
 108 - (IBAction)print:(id)sender
 109 {
 110         [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
 111 }
 112
 113 /**
 114  * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
 115  * to queue up LPR
 116  */
 117 - (void)uploadAndPrint:(id)sender
 118 {
 119         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 120
 121         [progress startAnimation:self];
 122         [progress setHidden:NO];
 123         [status setHidden:NO];
 124
 125         FILE *localFile;
 126         struct stat fileInfo;
 127         const char *fileName = [[self getUploadSafeName:[dragRegion filePath]] UTF8String];
 128
 129         [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
 130         struct sockaddr_in sin;
 131         int sock = socket(AF_INET, SOCK_STREAM, 0);
 132         sin.sin_port = htons(22);
 133         sin.sin_family = AF_INET;
 134
 135         struct hostent *host = gethostbyname("acs.bu.edu");
 136         memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
 137
 138         if (stat([[dragRegion filePath] UTF8String], &fileInfo))
 139         {
 140                 return [self setStatus:@"Invalid file selected" isError:YES];
 141         }
 142
 143         if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
 144         {
 145                 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
 146         }
 147
 148         LIBSSH2_SESSION *ssh = libssh2_session_init();
 149         if (ssh == NULL)
 150         {
 151                 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
 152         }
 153
 154         if (libssh2_session_startup(ssh, sock))
 155         {
 156                 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
 157         }
 158
 159         if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
 160         {
 161                 [self setStatus:@"Bad username/password" isError:YES];
 162                 goto shutdown;
 163         }
 164
 165         LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, fileName, 0755, (unsigned long)fileInfo.st_size);
 166         if (!channel)
 167         {
 168                 [self setStatus:@"Unable to open upload SCP session" isError:YES];
 169                 goto shutdown;
 170         }
 171
 172         [self setStatus:@"Uploading file..." isError:NO];
 173
 174         localFile = fopen([[dragRegion filePath] UTF8String], "r");
 175         char buf[1024];
 176         char *pbuf;
 177         int numread, numwrote;
 178         do
 179         {
 180                 numread = fread(buf, 1, sizeof(buf), localFile);
 181                 if (numread <= 0)
 182                 {
 183                         break;
 184                 }
 185
 186                 pbuf = buf;
 187                 do
 188                 {
 189                         numwrote = libssh2_channel_write(channel, pbuf, numread);
 190                         pbuf += numwrote;
 191                         numread -= numread;
 192                 } while (numwrote > 0);
 193
 194         } while(1);
 195
 196         [self setStatus:@"File uploaded!" isError:NO];
 197
 198         libssh2_channel_send_eof(channel);
 199         libssh2_channel_wait_eof(channel);
 200         libssh2_channel_wait_closed(channel);
 201         libssh2_channel_free(channel);
 202         channel = NULL;
 203
 204         channel = libssh2_channel_open_session(ssh);
 205         if (!channel)
 206         {
 207                 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
 208                 goto shutdown;
 209         }
 210
 211         if (libssh2_channel_request_pty(channel, "vanilla"))
 212         {
 213                 [self setStatus:@"Could not open ANSI TTY" isError:YES];
 214                 goto shutdown;
 215         }
 216
 217         if (libssh2_channel_shell(channel))
 218         {
 219                 [self setStatus:@"Failed to open remote shell" isError:YES];
 220                 goto shutdown;
 221         }
 222
 223         [self setStatus:@"Opened remote SSH shell" isError:NO];
 224
 225         // read the banner
 226         [self readChannel:channel];
 227
 228         // ACS outage messages --> skip some more
 229         char *delay = "q\r\n\0";
 230         libssh2_channel_write(channel, delay, sizeof(char) * strlen(delay));
 231         [self readChannel:channel];
 232
 233         // send the job to lpr
 234         char *cmd;
 235 #ifndef BLU_DEBUG
 236         NSString *printer = [[printersController selection] valueForKey:@"unixName"];
 237         cmd = (char *)[[NSString stringWithFormat:@"lpr -m -P%@ %s\r\n\0", printer, fileName] UTF8String];
 238 #else
 239         cmd = "touch __PRINT__\r\n\0";
 240 #endif
 241         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 242         [self readChannel:channel];
 243
 244         // remove our temp file
 245         cmd = (char *)[[NSString stringWithFormat:@"rm -f %s\r\n\0", fileName] UTF8String];
 246         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 247         [self readChannel:channel];
 248
 249         [self setStatus:@"Printed!" isError:NO];
 250
 251         libssh2_channel_send_eof(channel);
 252         libssh2_channel_eof(channel);
 253         libssh2_channel_close(channel);
 254
 255 shutdown:
 256         if (channel)
 257         {
 258                 //libssh2_channel_free(channel);
 259                 channel = NULL;
 260         }
 261         libssh2_session_disconnect(ssh, "Normal disconnect.");
 262         libssh2_session_free(ssh);
 263
 264         close(sock);
 265
 266         [progress stopAnimation:self];
 267
 268         [pool release];
 269 }
 270
 271 /**
 272  * Returns an NSString that is safe for uploding onto the server
 273  */
 274 - (NSString *)getUploadSafeName:(NSString *)name
 275 {
 276         NSMutableString *n = [NSMutableString stringWithString:name];
 277         [n replaceOccurrencesOfString:@" " withString:@"" options:NSBackwardsSearch range:NSMakeRange(0, [name length])];
 278         name = (NSString *)n;
 279         name = [name lastPathComponent];
 280         name = [name stringByDeletingPathExtension];
 281         if ([name length] > 20)
 282                 name = [name substringToIndex:20];
 283
 284         srandomdev();
 285         return [NSString stringWithFormat:@"~/%@.%d.pdf", name, random()];
 286 }
 287
 288 @end