photoid.c
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	/* photoid.c - photo ID handling code
	* Copyright (C) 2001, 2002, 2005, 2006, 2008, 2011 Free Software Foundation, Inc.
	*
	* This file is part of GnuPG.
	*
	* GnuPG is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 3 of the License, or
	* (at your option) any later version.
	*
	* GnuPG is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <https://www.gnu.org/licenses/>.
	*/

	#include <config.h>
	#include <errno.h>
	#include <stdio.h>
	#include <string.h>
	#ifdef _WIN32
	# ifdef HAVE_WINSOCK2_H
	# include <winsock2.h>
	# endif
	# include <windows.h>
	# ifndef VER_PLATFORM_WIN32_WINDOWS
	# define VER_PLATFORM_WIN32_WINDOWS 1
	# endif
	#endif

	#include "gpg.h"
	#include "../common/util.h"
	#include "packet.h"
	#include "../common/status.h"
	#include "exec.h"
	#include "keydb.h"
	#include "../common/i18n.h"
	#include "../common/iobuf.h"
	#include "options.h"
	#include "main.h"
	#include "photoid.h"
	#include "../common/ttyio.h"
	#include "trustdb.h"

	/* Generate a new photo id packet, or return NULL if canceled.
	FIXME: Should we add a duplicates check similar to generate_user_id? */
	PKT_user_id *
	generate_photo_id (ctrl_t ctrl, PKT_public_key pk,const char photo_name)
	{
	PKT_user_id *uid;
	int error=1,i;
	unsigned int len;
	char *filename;
	byte *photo=NULL;
	byte header[16];
	IOBUF file;
	int overflow;

	header[0]=0x10; /* little side of photo header length */
	header[1]=0; /* big side of photo header length */
	header[2]=1; /* 1 == version of photo header */
	header[3]=1; /* 1 == JPEG */

	for(i=4;i<16;i++) /* The reserved bytes */
	header[i]=0;

	#define EXTRA_UID_NAME_SPACE 71
	uid=xmalloc_clear(sizeof(*uid)+71);

	if(photo_name && *photo_name)
	filename=make_filename(photo_name,(void *)NULL);
	else
	{
	tty_printf(_("\nPick an image to use for your photo ID."
	" The image must be a JPEG file.\n"
	"Remember that the image is stored within your public key."
	" If you use a\n"
	"very large picture, your key will become very large"
	" as well!\n"
	"Keeping the image close to 240x288 is a good size"
	" to use.\n"));
	filename=NULL;
	}

	while(photo==NULL)
	{
	if(filename==NULL)
	{
	char *tempname;

	tty_printf("\n");

	tty_enable_completion(NULL);

	tempname=cpr_get("photoid.jpeg.add",
	_("Enter JPEG filename for photo ID: "));

	tty_disable_completion();

	filename=make_filename(tempname,(void *)NULL);

	xfree(tempname);

	if(strlen(filename)==0)
	goto scram;
	}

	file=iobuf_open(filename);
	if (file && is_secured_file (iobuf_get_fd (file)))
	{
	iobuf_close (file);
	file = NULL;
	gpg_err_set_errno (EPERM);
	}
	if(!file)
	{
	log_error(_("unable to open JPEG file '%s': %s\n"),
	filename,strerror(errno));
	xfree(filename);
	filename=NULL;
	continue;
	}


	len=iobuf_get_filelength(file, &overflow);
	if(len>6144 \|\| overflow)
	{
	tty_printf( _("This JPEG is really large (%d bytes) !\n"),len);
	if(!cpr_get_answer_is_yes("photoid.jpeg.size",
	_("Are you sure you want to use it? (y/N) ")))
	{
	iobuf_close(file);
	xfree(filename);
	filename=NULL;
	continue;
	}
	}

	photo=xmalloc(len);
	iobuf_read(file,photo,len);
	iobuf_close(file);

	/* Is it a JPEG? */
	if(photo[0]!=0xFF \|\| photo[1]!=0xD8)
	{
	log_error(_("'%s' is not a JPEG file\n"),filename);
	xfree(photo);
	photo=NULL;
	xfree(filename);
	filename=NULL;
	continue;
	}

	/* Build the packet */
	build_attribute_subpkt(uid,1,photo,len,header,16);
	parse_attribute_subpkts(uid);
	make_attribute_uidname(uid, EXTRA_UID_NAME_SPACE);

	/* Showing the photo is not safe when noninteractive since the
	"user" may not be able to dismiss a viewer window! */
	if(opt.command_fd==-1)
	{
	show_photos (ctrl, uid->attribs, uid->numattribs, pk, uid);
	switch(cpr_get_answer_yes_no_quit("photoid.jpeg.okay",
	_("Is this photo correct (y/N/q)? ")))
	{
	case -1:
	goto scram;
	case 0:
	free_attributes(uid);
	xfree(photo);
	photo=NULL;
	xfree(filename);
	filename=NULL;
	continue;
	}
	}
	}

	error=0;
	uid->ref=1;

	scram:
	xfree(filename);
	xfree(photo);

	if(error)
	{
	free_attributes(uid);
	xfree(uid);
	return NULL;
	}

	return uid;
	}

	/* Returns 0 for error, 1 for valid */
	int parse_image_header(const struct user_attribute attr,byte type,u32 *len)
	{
	u16 headerlen;

	if(attr->len<3)
	return 0;

	/* For historical reasons (i.e. "oops!"), the header length is
	little endian. */
	headerlen=(attr->data[1]<<8) \| attr->data[0];

	if(headerlen>attr->len)
	return 0;

	if(type && attr->len>=4)
	{
	if(attr->data[2]==1) /* header version 1 */
	*type=attr->data[3];
	else
	*type=0;
	}

	*len=attr->len-headerlen;

	if(*len==0)
	return 0;

	return 1;
	}

	/* style==0 for extension, 1 for name, 2 for MIME type. Remember that
	the "name" style string could be used in a user ID name field, so
	make sure it is not too big (see parse-packet.c:parse_attribute).
	Extensions should be 3 characters long for the best cross-platform
	compatibility. */
	char *image_type_to_string(byte type,int style)
	{
	char *string;

	switch(type)
	{
	case 1: /* jpeg */
	if(style==0)
	string="jpg";
	else if(style==1)
	string="jpeg";
	else
	string="image/jpeg";
	break;

	default:
	if(style==0)
	string="bin";
	else if(style==1)
	string="unknown";
	else
	string="image/x-unknown";
	break;
	}

	return string;
	}

	#if !defined(FIXED_PHOTO_VIEWER) && !defined(DISABLE_PHOTO_VIEWER)
	static const char *
	get_default_photo_command(void)
	{
	#if defined(_WIN32)
	OSVERSIONINFO osvi;

	memset(&osvi,0,sizeof(osvi));
	osvi.dwOSVersionInfoSize=sizeof(osvi);
	GetVersionEx(&osvi);

	if(osvi.dwPlatformId==VER_PLATFORM_WIN32_WINDOWS)
	return "start /w %i";
	else
	return "!ShellExecute 400 %i";
	#elif defined(__APPLE__)
	/* OS X. This really needs more than just __APPLE__. */
	return "open %I";
	#elif defined(__riscos__)
	return "Filer_Run %I";
	#else
	if (!path_access ("xloadimage", X_OK))
	return "xloadimage -fork -quiet -title 'KeyID 0x%k' stdin";
	else if (!path_access ("display",X_OK))
	return "display -title 'KeyID 0x%k' %i";
	else if (getuid () && !path_access ("xdg-open", X_OK))
	{
	/* xdg-open spawns the actual program and exits so we need to
	* keep the temp file */
	return "xdg-open %I";
	}
	else
	return "/bin/true";
	#endif
	}
	#endif


	void
	show_photos (ctrl_t ctrl, const struct user_attribute *attrs, int count,
	PKT_public_key pk, PKT_user_id uid)
	{
	#ifdef DISABLE_PHOTO_VIEWER
	(void)attrs;
	(void)count;
	(void)pk;
	(void)uid;
	#else /!DISABLE_PHOTO_VIEWER/
	int i;
	struct expando_args args;
	u32 len;
	u32 kid[2]={0,0};

	memset (&args, 0, sizeof(args));
	args.pk = pk;
	args.validity_info = get_validity_info (ctrl, NULL, pk, uid);
	args.validity_string = get_validity_string (ctrl, pk, uid);
	namehash_from_uid (uid);
	args.namehash = uid->namehash;

	if (pk)
	keyid_from_pk (pk, kid);

	es_fflush (es_stdout);

	for(i=0;i<count;i++)
	if(attrs[i].type==ATTRIB_IMAGE &&
	parse_image_header(&attrs[i],&args.imagetype,&len))
	{
	char command,name;
	struct exec_info *spawn;
	int offset=attrs[i].len-len;

	#ifdef FIXED_PHOTO_VIEWER
	opt.photo_viewer=FIXED_PHOTO_VIEWER;
	#else
	if(!opt.photo_viewer)
	opt.photo_viewer=get_default_photo_command();
	#endif

	/* make command grow */
	command=pct_expando(opt.photo_viewer,&args);
	if(!command)
	goto fail;
	if (!*command)
	{
	xfree (command);
	goto fail;
	}

	name=xmalloc(16+strlen(EXTSEP_S)+
	strlen(image_type_to_string(args.imagetype,0))+1);

	/* Make the filename. Notice we are not using the image
	encoding type for more than cosmetics. Most external image
	viewers can handle a multitude of types, and even if one
	cannot understand a particular type, we have no way to know
	which. The spec permits this, by the way. -dms */

	#ifdef USE_ONLY_8DOT3
	sprintf(name,"%08lX" EXTSEP_S "%s",(ulong)kid[1],
	image_type_to_string(args.imagetype,0));
	#else
	sprintf(name,"%08lX%08lX" EXTSEP_S "%s",(ulong)kid[0],(ulong)kid[1],
	image_type_to_string(args.imagetype,0));
	#endif

	if(exec_write(&spawn,NULL,command,name,1,1)!=0)
	{
	xfree(name);
	goto fail;
	}

	#ifdef __riscos__
	riscos_set_filetype_by_mimetype(spawn->tempfile_in,
	image_type_to_string(args.imagetype,2));
	#endif

	xfree(name);

	fwrite(&attrs[i].data[offset],attrs[i].len-offset,1,spawn->tochild);

	if(exec_read(spawn)!=0)
	{
	exec_finish(spawn);
	goto fail;
	}

	if(exec_finish(spawn)!=0)
	goto fail;
	}

	return;

	fail:
	log_error(_("unable to display photo ID!\n"));
	#endif /!DISABLE_PHOTO_VIEWER/
	}

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Mime Type: text/x-c
Expires: Sat, May 10, 8:59 AM (1 d, 6 h)
Storage Engine: local-disk
Storage Format: Raw Data
Storage Handle: 84/62/33a1047912b67232b5c019f37790

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