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         }
  45         return self;
  46 }
  47
  48 /**
  49  * Dealloc
  50  */
  51 - (void)dealloc
  52 {
  53         [printers release];
  54         [super dealloc];
  55 }
  56
  57 /**
  58  * Sets the status text
  59  */
  60 - (void)setStatus:(NSString *)msg isError:(BOOL)error
  61 {
  62         [status setStringValue:msg];
  63         if (error)
  64         {
  65                 [status setTextColor:[NSColor redColor]];
  66                 [progress stopAnimation:self];
  67         }
  68         else
  69         {
  70                 [status setTextColor:[NSColor blackColor]];
  71         }
  72 }
  73
  74 /**
  75  * Reads through a channel (in non-blocking) mode until there is no more left to read
  76  * and then it returns. This calls sleep(1) so that the channel can have time to process.
  77  * Be sure this is threaded otherwis the interface will stall.
  78  */
  79 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
  80 {
  81         libssh2_channel_set_blocking(channel, 0);
  82
  83         char buf[1024];
  84         int numbytes;
  85         do
  86         {
  87                 memset(&buf, '\0', sizeof(buf));
  88                 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
  89                 sleep(1);
  90                 NSLog(@"SSH buffer: %s", buf);
  91         } while (libssh2_poll_channel_read(channel, 0));
  92 }
  93
  94 /**
  95  * Sends an item to the printer
  96  */
  97 - (IBAction)print:(id)sender
  98 {
  99         [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
 100 }
 101
 102 /**
 103  * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
 104  * to queue up LPR
 105  */
 106 - (void)uploadAndPrint:(id)sender
 107 {
 108         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 109
 110         [progress startAnimation:self];
 111         [progress setHidden:NO];
 112         [status setHidden:NO];
 113
 114         FILE *localFile;
 115         struct stat fileInfo;
 116         const char *fileName = [[self getUploadSafeName:[dragRegion filePath]] UTF8String];
 117
 118         [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
 119         struct sockaddr_in sin;
 120         int sock = socket(AF_INET, SOCK_STREAM, 0);
 121         sin.sin_port = htons(22);
 122         sin.sin_family = AF_INET;
 123
 124         struct hostent *host = gethostbyname("acs.bu.edu");
 125         memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
 126
 127         if (stat([[dragRegion filePath] UTF8String], &fileInfo))
 128         {
 129                 return [self setStatus:@"Invalid file selected" isError:YES];
 130         }
 131
 132         if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
 133         {
 134                 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
 135         }
 136
 137         LIBSSH2_SESSION *ssh = libssh2_session_init();
 138         if (ssh == NULL)
 139         {
 140                 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
 141         }
 142
 143         if (libssh2_session_startup(ssh, sock))
 144         {
 145                 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
 146         }
 147
 148         if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
 149         {
 150                 [self setStatus:@"Bad username/password" isError:YES];
 151                 goto shutdown;
 152         }
 153
 154         LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, fileName, 0755, (unsigned long)fileInfo.st_size);
 155         if (!channel)
 156         {
 157                 [self setStatus:@"Unable to open upload SCP session" isError:YES];
 158                 goto shutdown;
 159         }
 160
 161         [self setStatus:@"Uploading file..." isError:NO];
 162
 163         localFile = fopen([[dragRegion filePath] UTF8String], "r");
 164         char buf[1024];
 165         char *pbuf;
 166         int numread, numwrote;
 167         do
 168         {
 169                 numread = fread(buf, 1, sizeof(buf), localFile);
 170                 if (numread <= 0)
 171                 {
 172                         break;
 173                 }
 174
 175                 pbuf = buf;
 176                 do
 177                 {
 178                         numwrote = libssh2_channel_write(channel, pbuf, numread);
 179                         pbuf += numwrote;
 180                         numread -= numread;
 181                 } while (numwrote > 0);
 182
 183         } while(1);
 184
 185         [self setStatus:@"File uploaded!" isError:NO];
 186
 187         libssh2_channel_send_eof(channel);
 188         libssh2_channel_wait_eof(channel);
 189         libssh2_channel_wait_closed(channel);
 190         libssh2_channel_free(channel);
 191         channel = NULL;
 192
 193         channel = libssh2_channel_open_session(ssh);
 194         if (!channel)
 195         {
 196                 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
 197                 goto shutdown;
 198         }
 199
 200         if (libssh2_channel_request_pty(channel, "vanilla"))
 201         {
 202                 [self setStatus:@"Could not open ANSI TTY" isError:YES];
 203                 goto shutdown;
 204         }
 205
 206         if (libssh2_channel_shell(channel))
 207         {
 208                 [self setStatus:@"Failed to open remote shell" isError:YES];
 209                 goto shutdown;
 210         }
 211
 212         [self setStatus:@"Opened remote SSH shell" isError:NO];
 213
 214         // read the banner
 215         [self readChannel:channel];
 216
 217         // ACS outage messages --> skip some more
 218         char *delay = "q\r\n\0";
 219         libssh2_channel_write(channel, delay, sizeof(char) * strlen(delay));
 220         [self readChannel:channel];
 221
 222         // send the job to lpr
 223         char *cmd;
 224 #ifndef BLU_DEBUG
 225         NSString *printer = [[printersController selection] valueForKey:@"unixName"];
 226         cmd = (char *)[[NSString stringWithFormat:@"lpr -m -P%@ %s\r\n\0", printer, fileName] UTF8String];
 227 #else
 228         cmd = "touch __PRINT__\r\n\0";
 229 #endif
 230         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 231         [self readChannel:channel];
 232
 233         // remove our temp file
 234         cmd = (char *)[[NSString stringWithFormat:@"rm -f %s\r\n\0", fileName] UTF8String];
 235         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 236         [self readChannel:channel];
 237
 238         [self setStatus:@"Printed!" isError:NO];
 239
 240         libssh2_channel_send_eof(channel);
 241         libssh2_channel_eof(channel);
 242         libssh2_channel_close(channel);
 243
 244 shutdown:
 245         if (channel)
 246         {
 247                 //libssh2_channel_free(channel);
 248                 channel = NULL;
 249         }
 250         libssh2_session_disconnect(ssh, "Normal disconnect.");
 251         libssh2_session_free(ssh);
 252
 253         close(sock);
 254
 255         [progress stopAnimation:self];
 256
 257         [pool release];
 258 }
 259
 260 /**
 261  * Returns an NSString that is safe for uploding onto the server
 262  */
 263 - (NSString *)getUploadSafeName:(NSString *)name
 264 {
 265         NSMutableString *n = [NSMutableString stringWithString:name];
 266         [n replaceOccurrencesOfString:@" " withString:@"" options:NSBackwardsSearch range:NSMakeRange(0, [name length])];
 267         name = (NSString *)n;
 268         name = [name lastPathComponent];
 269         name = [name stringByDeletingPathExtension];
 270         if ([name length] > 20)
 271                 name = [name substringToIndex:20];
 272
 273         srandomdev();
 274         return [NSString stringWithFormat:@"~/%@.%d.pdf", name, random()];
 275 }
 276
 277 @end