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 = [NSMutableArray array];
  43
  44                 NSArray *values = [NSArray arrayWithObjects:@"Double-Sided, Stapled $0.05", @"publp", nil];
  45                 NSArray *keys = [NSArray arrayWithObjects:@"displayName", @"unixName", nil];
  46                 [printers addObject:[NSDictionary dictionaryWithObjects:values forKeys:keys]];
  47
  48                 values = [NSArray arrayWithObjects:@"Single-Sided, Stapled $0.10", @"pubps", nil];
  49                 [printers addObject:[NSDictionary dictionaryWithObjects:values forKeys:keys]];
  50
  51                 values = [NSArray arrayWithObjects:@"Double-Sided, Not Stapled $0.05", @"publpns", nil];
  52                 [printers addObject:[NSDictionary dictionaryWithObjects:values forKeys:keys]];
  53
  54                 values = [NSArray arrayWithObjects:@"Single-Sided, Not Stapled $0.10", @"pubpsns", nil];
  55                 [printers addObject:[NSDictionary dictionaryWithObjects:values forKeys:keys]];
  56         }
  57         return self;
  58 }
  59
  60 /**
  61  * Sets the status text
  62  */
  63 - (void)setStatus:(NSString *)msg isError:(BOOL)error
  64 {
  65         [status setStringValue:msg];
  66         if (error)
  67         {
  68                 [status setTextColor:[NSColor redColor]];
  69                 [progress stopAnimation:self];
  70         }
  71         else
  72         {
  73                 [status setTextColor:[NSColor blackColor]];
  74         }
  75 }
  76
  77 /**
  78  * Reads through a channel (in non-blocking) mode until there is no more left to read
  79  * and then it returns. This calls sleep(1) so that the channel can have time to process.
  80  * Be sure this is threaded otherwis the interface will stall.
  81  */
  82 - (void)readChannel:(LIBSSH2_CHANNEL *)channel
  83 {
  84         libssh2_channel_set_blocking(channel, 0);
  85
  86         char buf[1024];
  87         int numbytes;
  88         do
  89         {
  90                 memset(&buf, '\0', sizeof(buf));
  91                 sleep(1);
  92                 numbytes = libssh2_channel_read(channel, buf, sizeof(buf));
  93         } while (numbytes > 0);
  94 }
  95
  96 /**
  97  * Sends an item to the printer
  98  */
  99 - (IBAction)print:(id)sender
 100 {
 101         [NSThread detachNewThreadSelector:@selector(uploadAndPrint:) toTarget:self withObject:sender];
 102 }
 103
 104 /**
 105  * Opens an SSH session, creates a SCP channel to upload the file, followed by a shell channel
 106  * to queue up LPR
 107  */
 108 - (void)uploadAndPrint:(id)sender
 109 {
 110         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 111
 112         [progress startAnimation:self];
 113         [progress setHidden:NO];
 114         [status setHidden:NO];
 115
 116         NSString *printer = [[printersController selection] valueForKey:@"unixName"];
 117         FILE *localFile;
 118         struct stat fileInfo;
 119
 120         [self setStatus:@"Connecting to acs.bu.edu" isError:NO];
 121         struct sockaddr_in sin;
 122         int sock = socket(AF_INET, SOCK_STREAM, 0);
 123         sin.sin_port = htons(22);
 124         sin.sin_family = AF_INET;
 125
 126         struct hostent *host = gethostbyname("acs.bu.edu");
 127         memcpy(&sin.sin_addr, host->h_addr_list[0], host->h_length);
 128
 129         if (stat([[dragRegion filePath] UTF8String], &fileInfo))
 130         {
 131                 return [self setStatus:@"Invalid file selected" isError:YES];
 132         }
 133
 134         if (connect(sock, (struct sockaddr *)(&sin), sizeof(struct sockaddr_in)) != 0)
 135         {
 136                 return [self setStatus:@"Could not connect to acs.bu.edu" isError:YES];
 137         }
 138
 139         LIBSSH2_SESSION *ssh = libssh2_session_init();
 140         if (ssh == NULL)
 141         {
 142                 return [self setStatus:@"Failed to initialize SSH context" isError:YES];
 143         }
 144
 145         if (libssh2_session_startup(ssh, sock))
 146         {
 147                 return [self setStatus:@"Could not tunnel over SSH" isError:YES];
 148         }
 149
 150         if (libssh2_userauth_password(ssh, [[username stringValue] UTF8String], [[password stringValue] UTF8String]))
 151         {
 152                 [self setStatus:@"Bad username/password" isError:YES];
 153                 goto shutdown;
 154         }
 155
 156         LIBSSH2_CHANNEL *channel = libssh2_scp_send(ssh, "~/__bu_print_drop__.pdf", 0755, (unsigned long)fileInfo.st_size);
 157         if (!channel)
 158         {
 159                 [self setStatus:@"Unable to open upload SCP session" isError:YES];
 160                 goto shutdown;
 161         }
 162
 163         [self setStatus:@"Uploading file..." isError:NO];
 164
 165         localFile = fopen([[dragRegion filePath] UTF8String], "r");
 166         char buf[1024];
 167         char *pbuf;
 168         int numread, numwrote;
 169         do
 170         {
 171                 numread = fread(buf, 1, sizeof(buf), localFile);
 172                 if (numread <= 0)
 173                 {
 174                         break;
 175                 }
 176
 177                 pbuf = buf;
 178                 do
 179                 {
 180                         numwrote = libssh2_channel_write(channel, pbuf, numread);
 181                         pbuf += numwrote;
 182                         numread -= numread;
 183                 } while (numwrote > 0);
 184
 185         } while(1);
 186
 187         [self setStatus:@"File uploaded!" isError:NO];
 188
 189         libssh2_channel_send_eof(channel);
 190         libssh2_channel_wait_eof(channel);
 191         libssh2_channel_wait_closed(channel);
 192         libssh2_channel_free(channel);
 193         channel = NULL;
 194
 195         channel = libssh2_channel_open_session(ssh);
 196         if (!channel)
 197         {
 198                 [self setStatus:@"Could not open SSH channel for printing" isError:YES];
 199                 goto shutdown;
 200         }
 201
 202         if (libssh2_channel_request_pty(channel, "vanilla"))
 203         {
 204                 [self setStatus:@"Could not open ANSI TTY" isError:YES];
 205                 goto shutdown;
 206         }
 207
 208         if (libssh2_channel_shell(channel))
 209         {
 210                 [self setStatus:@"Failed to open remote shell" isError:YES];
 211                 goto shutdown;
 212         }
 213
 214         [self setStatus:@"Opened remote SSH shell" isError:NO];
 215
 216         // read the banner
 217         [self readChannel:channel];
 218
 219         // send the job to lpr
 220         char *cmd = (char *)[[NSString stringWithFormat:@"touch ~/print-%@.drop\r\n\0", printer] UTF8String];
 221         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 222         [self readChannel:channel];
 223
 224         // remove our temp file
 225         cmd = "rm -f __bu_print_drop__.pdf\r\n\0";
 226         libssh2_channel_write(channel, cmd, sizeof(char) * strlen(cmd));
 227         [self readChannel:channel];
 228
 229         [self setStatus:@"Printed!" isError:NO];
 230
 231         libssh2_channel_send_eof(channel);
 232         libssh2_channel_eof(channel);
 233         libssh2_channel_close(channel);
 234
 235 shutdown:
 236         if (channel)
 237         {
 238                 //libssh2_channel_free(channel);
 239                 channel = NULL;
 240         }
 241         libssh2_session_disconnect(ssh, "Normal disconnect.");
 242         libssh2_session_free(ssh);
 243
 244         close(sock);
 245
 246         [progress stopAnimation:self];
 247
 248         [pool release];
 249 }
 250
 251 @end