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