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libisoburn/xorriso/filters.c

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/* xorriso - creates, loads, manipulates and burns ISO 9660 filesystem images.
Copyright 2007-2014 Thomas Schmitt, <scdbackup@gmx.net>
Provided under GPL version 2 or later.
This file contains functions which operate on data filter objects.
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <time.h>
#include <errno.h>
#include "lib_mgt.h"
#include "iso_tree.h"
/*
#include "xorriso.h"
#include "xorriso_private.h"
#include "xorrisoburn.h"
#include "iso_img.h"
#include "iso_manip.h"
#include "sort_cmp.h"
*/
struct Xorriso_extF {
int flag; /* unused yet */
IsoExternalFilterCommand *cmd;
};
int Xorriso_extf_destroy(struct XorrisO *xorriso, struct Xorriso_extF **filter,
int flag);
/* @param flag see struct Xorriso_extF.flag */
int Xorriso_extf_new(struct XorrisO *xorriso, struct Xorriso_extF **filter,
char *path, int argc, char **argv, int behavior,
char *suffix, char *name, int flag)
{
int i;
struct Xorriso_extF *o= NULL;
IsoExternalFilterCommand *cmd;
*filter= o= calloc(sizeof(struct Xorriso_extF), 1);
if(o == NULL)
goto failure;
o->flag= flag;
o->cmd= NULL;
o->cmd= cmd= calloc(sizeof(IsoExternalFilterCommand), 1);
if(cmd == NULL)
goto failure;
cmd->version= 0;
cmd->refcount= 0;
cmd->name= NULL;
cmd->path= NULL;
cmd->argv= NULL;
cmd->argc= argc + 1;
cmd->behavior= behavior;
cmd->suffix= NULL;
cmd->suffix= strdup(suffix);
if(cmd->suffix == NULL)
goto failure;
cmd->path= strdup(path);
if(cmd->path == NULL)
goto failure;
cmd->argv= calloc(sizeof(char *), argc + 2);
if(cmd->argv == NULL)
goto failure;
for(i= 0; i < argc + 2; i++)
cmd->argv[i]= NULL;
cmd->argv[0]= strdup(path);
if(cmd->argv[0] == NULL)
goto failure;
for(i= 0; i < argc; i++) {
cmd->argv[i + 1]= strdup(argv[i]);
if(cmd->argv[i] == NULL)
goto failure;
}
cmd->name= strdup(name);
if(cmd->name == NULL)
goto failure;
return(1);
failure:;
Xorriso_extf_destroy(xorriso, filter, 0);
return(-1);
}
int Xorriso_extf_destroy(struct XorrisO *xorriso, struct Xorriso_extF **filter,
int flag)
{
int i;
IsoExternalFilterCommand *cmd;
if(*filter == NULL)
return(0);
cmd= (*filter)->cmd;
if(cmd != NULL) {
if(cmd->refcount > 0)
return(0);
if(cmd->path != NULL)
free(cmd->path);
if(cmd->suffix != NULL)
free(cmd->suffix);
if(cmd->argv != NULL) {
for(i= 0; i < cmd->argc; i++)
if(cmd->argv[i] != NULL)
free(cmd->argv[i]);
free((char *) cmd->argv);
}
if(cmd->name != NULL)
free(cmd->name);
free((char *) cmd);
}
free((char *) *filter);
*filter= NULL;
return(1);
}
int Xorriso_lookup_extf(struct XorrisO *xorriso, char *name,
struct Xorriso_lsT **found_lst, int flag)
{
struct Xorriso_extF *filter;
struct Xorriso_lsT *lst;
for(lst= xorriso->filters; lst != NULL; lst= Xorriso_lst_get_next(lst, 0)) {
filter= (struct Xorriso_extF *) Xorriso_lst_get_text(lst, 0);
if(strcmp(filter->cmd->name, name) == 0) {
*found_lst= lst;
return(1);
}
}
return(0);
}
int Xorriso_destroy_all_extf(struct XorrisO *xorriso, int flag)
{
struct Xorriso_extF *filter;
struct Xorriso_lsT *lst, *next_lst;
for(lst= xorriso->filters; lst != NULL; lst= next_lst) {
filter= (struct Xorriso_extF *) Xorriso_lst_get_text(lst, 0);
Xorriso_lst_detach_text(lst, 0);
next_lst= Xorriso_lst_get_next(lst, 0);
Xorriso_lst_destroy(&lst, 0);
Xorriso_extf_destroy(xorriso, &filter, 0);
}
xorriso->filters= NULL;
return(1);
}
/*
@param flag bit0= return 2 if renaming is not possible by libisofs
(always: if demanded strip suffix is missing
or if suffix makes name length > 255)
bit1= strip suffix rather than appending it
*/
int Xorriso_rename_suffix(struct XorrisO *xorriso, IsoNode *node, char *suffix,
char *show_path, char new_name[], int flag)
{
int ret, lo= 0, ls= 0, strip_suffix;
char *old_name= NULL, *show_name;
strip_suffix= !!(flag & 2);
old_name= strdup((char *) iso_node_get_name(node));
show_name= old_name;
if(show_path != NULL)
if(show_path[0] != 0)
show_name= show_path;
lo= strlen(old_name);
ls= strlen(suffix);
if(strip_suffix) {
if(lo <= ls) {
/* refuse gracefully */
ret= 2; goto ex;
}
if(strcmp(old_name + lo - ls, suffix) != 0) {
ret= 2; goto ex;
}
if(lo >= SfileadrL)
goto cannot_remove_suffix;
strcpy(new_name, old_name);
new_name[lo - ls]= 0;
ret = iso_node_set_name(node, new_name);
if (ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
if (!(flag & 1))
Xorriso_report_iso_error(xorriso, "", ret,
"Error when renaming ISO node", 0, "FAILURE", 1);
cannot_remove_suffix:;
strcpy(xorriso->info_text, "-set_filter: Cannot remove suffix from ");
Text_shellsafe(show_name, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0,
(flag & 1) ? "WARNING" : "FAILURE", 0);
ret= 2 * (flag & 1); goto ex;
}
} else {
/* check whether suffix already present */
if(lo >= ls)
if(strcmp(old_name + lo - ls, suffix) == 0) {
/* refuse gracefully */
ret= 2; goto ex;
}
if(lo + ls > 255) {
cannot_append_suffix:;
strcpy(xorriso->info_text, "-set_filter: Cannot append suffix to ");
Text_shellsafe(show_name, xorriso->info_text, 1);
strcat(xorriso->info_text, ". Left unfiltered.");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0,
(flag & 1) ? "WARNING" : "FAILURE", 0);
ret= 2 * (flag & 1); goto ex;
}
sprintf(new_name, "%s%s", old_name, suffix);
ret = iso_node_set_name(node, new_name);
if (ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
if (!(flag & 1))
Xorriso_report_iso_error(xorriso, "", ret,
"Error when renaming ISO node", 0, "FAILURE", 1);
goto cannot_append_suffix;
}
}
ret= 1;
ex:;
if(old_name != NULL)
free(old_name);
Xorriso_process_msg_queues(xorriso,0);
return(ret);
}
/*
@param flag bit0= return 2 if renaming is not possible
bit1= print pacifier messages
*/
int Xorriso_set_filter(struct XorrisO *xorriso, void *in_node,
char *path, char *filter_name, int flag)
{
int ret, strip_suffix= 0, strip_filter= 0, filter_ret= 0;
int explicit_suffix= 0, internal_filter= 0;
IsoNode *node;
IsoFile *file;
struct Xorriso_lsT *found_lst;
struct Xorriso_extF *found_filter;
IsoExternalFilterCommand *cmd = NULL;
char *old_name= NULL, *new_name= NULL, *suffix= "";
IsoStream *stream;
Xorriso_alloc_meM(new_name, char, SfileadrL);
new_name[0]= 0;
node= (IsoNode *) in_node;
if(node == NULL) {
ret= Xorriso_get_node_by_path(xorriso, path, NULL, &node, 0);
if(ret <= 0)
goto ex;
}
if(!LIBISO_ISREG(node)) {
strcpy(xorriso->info_text, "-set_filter: Not a regular data file node ");
Text_shellsafe(path, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
ret= 0; goto ex;
}
file= (IsoFile *) node;
if(strncmp(filter_name, "--remove-all-filters", 20) == 0) {
strip_filter= 1;
strip_suffix= 1;
if(strlen(filter_name) > 21) {
strip_suffix= (filter_name[20] != '+');
suffix= filter_name + 21;
explicit_suffix= 1;
}
} else if(strcmp(filter_name, "--zisofs") == 0) {
internal_filter= 1;
} else if(strcmp(filter_name, "--zisofs-decode") == 0) {
internal_filter= 2;
} else if(strcmp(filter_name, "--gzip") == 0) {
internal_filter= 3;
suffix= ".gz";
strip_suffix= 0;
explicit_suffix= 1;
} else if(strcmp(filter_name, "--gunzip") == 0 ||
strcmp(filter_name, "--gzip-decode") == 0) {
internal_filter= 4;
suffix= ".gz";
strip_suffix= 1;
explicit_suffix= 1;
} else {
ret= Xorriso_lookup_extf(xorriso, filter_name, &found_lst, 0);
if(ret < 0)
goto ex;
if(ret == 0) {
strcpy(xorriso->info_text, "-set_filter: Not a registered filter name ");
Text_shellsafe(filter_name, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
ret= 0; goto ex;
}
found_filter= (struct Xorriso_extF *) Xorriso_lst_get_text(found_lst, 0);
cmd= found_filter->cmd;
suffix= cmd->suffix;
strip_suffix= cmd->behavior & 8;
}
if(suffix[0]) {
/* >>> would need full iso_rr_path of node for showing */;
old_name= strdup((char *) iso_node_get_name(node));
ret= Xorriso_rename_suffix(xorriso, node, suffix, path, new_name,
(flag & 1) | (strip_suffix ? 2 : 0));
if(ret <= 0 || ret == 2)
goto ex;
}
if(strip_filter) {
while(1) {
if(!explicit_suffix) {
stream= iso_file_get_stream(file);
if(strncmp(stream->class->type, "gzip", 4) == 0) {
suffix= ".gz";
strip_suffix= 1;
} else if(strncmp(stream->class->type, "pizg", 4) == 0) {
suffix= ".gz";
strip_suffix= 0;
} else {
ret= iso_stream_get_external_filter(stream, &cmd, 0);
if(ret > 0) {
suffix= cmd->suffix;
strip_suffix= !(cmd->behavior & 8);
}
}
if(suffix[0]) {
/* >>> would need the current renaming state of path */;
ret= Xorriso_rename_suffix(xorriso, node, suffix, NULL, new_name,
(flag & 1) | (strip_suffix << 1));
if(ret <= 0 || ret == 2)
goto ex;
}
}
ret= iso_file_remove_filter(file, 0);
if(ret != 1)
break;
}
filter_ret= 1;
} else if (internal_filter == 1 || internal_filter == 2) {
filter_ret = iso_file_add_zisofs_filter(file, 1 | (internal_filter & 2));
if(filter_ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
if(!(internal_filter == 2 && filter_ret == (int) ISO_ZISOFS_WRONG_INPUT))
Xorriso_report_iso_error(xorriso, "", filter_ret,
"Error when setting filter to ISO node", 0, "FAILURE", 1);
}
} else if (internal_filter == 3 || internal_filter == 4) {
filter_ret = iso_file_add_gzip_filter(file,
1 | ((internal_filter == 4) << 1));
if(filter_ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
Xorriso_report_iso_error(xorriso, "", filter_ret,
"Error when setting filter to ISO node", 0, "FAILURE", 1);
}
} else {
#ifndef Xorriso_allow_extf_suiD
/* This is a final safety precaution before iso_file_add_external_filter()
performs fork() and executes the alleged filter program.
*/
if(getuid() != geteuid()) {
sprintf(xorriso->info_text,
"-set_filter: UID and EUID differ. Will not run external programs.");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FATAL", 0);
ret= 0; goto ex;
}
#endif /* ! Xorriso_allow_extf_suiD */
filter_ret = iso_file_add_external_filter(file, cmd, 0);
if(filter_ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
Xorriso_report_iso_error(xorriso, "", filter_ret,
"Error when setting filter to ISO node", 0, "FAILURE", 1);
}
}
if(filter_ret != 1 && new_name[0] && old_name != NULL) {
ret = iso_node_set_name(node, old_name);
if (ret < 0) {
Xorriso_process_msg_queues(xorriso,0);
if (!(flag & 1))
Xorriso_report_iso_error(xorriso, "", ret,
"Error when renaming ISO node", 0, "FAILURE", 1);
}
}
if(flag & 2) {
xorriso->pacifier_count++;
Xorriso_pacifier_callback(xorriso, "file filters processed",
xorriso->pacifier_count, xorriso->pacifier_total, "", 0);
}
if(filter_ret < 0) {
ret= 0; goto ex;
}
ret= filter_ret;
ex:;
if(old_name != NULL)
free(old_name);
Xorriso_free_meM(new_name);
Xorriso_process_msg_queues(xorriso,0);
return(ret);
}
int Xorriso_external_filter_banned(struct XorrisO *xorriso, char *purpose,
int flag)
{
int is_banned= 0;
#ifndef Xorriso_allow_external_filterS
/* To be controlled by: configure --enable-external-filters */
sprintf(xorriso->info_text, "%s : Banned at compile time.", purpose);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
sprintf(xorriso->info_text,
"This may be changed at compile time by ./configure option --enable-external-filters");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "HINT", 0);
is_banned= 1;
#endif /* ! Xorriso_allow_external_filterS */
#ifndef Xorriso_allow_extf_suiD
/* To be controlled by: configure --enable-external-filters-setuid */
if(getuid() != geteuid()) {
sprintf(xorriso->info_text,
"-set_filter: UID and EUID differ. Will not run external programs.");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FATAL", 0);
sprintf(xorriso->info_text,
"This may be changed at compile time by ./configure option --enable-external-filters-setuid");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "HINT", 0);
is_banned= 1;
}
#endif /* ! Xorriso_allow_extf_suiD */
if(xorriso->filter_list_closed) {
sprintf(xorriso->info_text,
"%s : Banned by previous command -close_filter_list", purpose);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
is_banned= 1;
}
return(is_banned);
}
/* @param flag bit0= delete filter with the given name
*/
int Xorriso_external_filter(struct XorrisO *xorriso,
char *name, char *options, char *path,
int argc, char **argv, int flag)
{
int ret, delete= 0, behavior= 0, extf_flag= 0, is_banned= 0;
char *what, *what_next, *suffix= "";
struct Xorriso_lsT *lst;
struct Xorriso_extF *found_filter, *new_filter= NULL;
is_banned= Xorriso_external_filter_banned( xorriso,
flag & 1 ? "-unregister_filter" : "-external_filter", 0);
if(is_banned)
return(0);
if((!(flag & 1)) && path[0] != '/') {
sprintf(xorriso->info_text,
"-external_filter : Given command path does not begin by '/' : ");
Text_shellsafe(path, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
return(0);
}
delete= flag & 1;
ret= Xorriso_lookup_extf(xorriso, name, &lst, 0);
if(ret < 0)
return(ret);
if(ret > 0) {
if(delete) {
found_filter= (struct Xorriso_extF *) Xorriso_lst_get_text(lst, 0);
if(found_filter->cmd->refcount > 0) {
sprintf(xorriso->info_text,
"-external_filter: Cannot remove filter because it is in use by %.f nodes : ",
(double) found_filter->cmd->refcount);
Text_shellsafe(name, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
ret= 0; goto ex;
}
Xorriso_lst_detach_text(lst, 0);
if(xorriso->filters == lst)
xorriso->filters= Xorriso_lst_get_next(lst, 0);
Xorriso_lst_destroy(&lst, 0);
Xorriso_extf_destroy(xorriso, &found_filter, 0);
ret= 1; goto ex;
}
strcpy(xorriso->info_text,
"-external_filter: filter with given name already existing: ");
Text_shellsafe(name, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
ret= 0; goto ex;
}
if(delete) {
strcpy(xorriso->info_text,
"-external_filter: filter with given name does not exist: ");
Text_shellsafe(name, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
ret= 0; goto ex;
}
for(what= options; what!=NULL; what= what_next) {
what_next= strchr(what, ':');
if(what_next!=NULL) {
*what_next= 0;
what_next++;
}
if(strncmp(what, "default", 7) == 0) {
suffix= "";
behavior= 0;
} else if(strncmp(what, "suffix=", 7) == 0) {
suffix= what + 7;
} else if(strcmp(what, "remove_suffix") == 0) {
behavior|= 8;
} else if(strcmp(what, "if_nonempty") == 0) {
behavior|= 1;
} else if(strcmp(what, "if_reduction") == 0) {
behavior|= 2;
} else if(strcmp(what, "if_block_reduction") == 0) {
behavior|= 4;
} else if(strncmp(what, "used=", 5) == 0) {
; /* this is informational output from -status */
} else if(what[0]) {
strcpy(xorriso->info_text,
"-external_filter: unknown option ");
Text_shellsafe(what, xorriso->info_text, 1);
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
ret= 0; goto ex;
}
}
ret= Xorriso_extf_new(xorriso, &new_filter, path, argc, argv, behavior,
suffix, name, extf_flag);
if(ret <= 0) {
could_not_create:;
strcpy(xorriso->info_text,
"-external_filter: Could not create filter object");
Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
goto ex;
}
ret= Xorriso_lst_append_binary(&(xorriso->filters), (char *) new_filter,0, 4);
if(ret <= 0)
goto could_not_create;
ret= 1;
ex:;
if(ret <= 0) {
if(new_filter != NULL)
Xorriso_extf_destroy(xorriso, &new_filter, 0);
}
return(ret);
}
int Xorriso_status_extf(struct XorrisO *xorriso, char *filter, FILE *fp,
int flag)
/*
bit1= do only report to fp
*/
{
int i, maxl= 4 * SfileadrL;
struct Xorriso_extF *extf;
struct Xorriso_lsT *lst;
char *line;
line= xorriso->result_line;
for(lst= xorriso->filters; lst != NULL; lst= Xorriso_lst_get_next(lst, 0)) {
extf= (struct Xorriso_extF *) Xorriso_lst_get_text(lst, 0);
strcpy(xorriso->result_line, "-external_filter ");
Text_shellsafe(extf->cmd->name, line, 1);
if((int) strlen(line) > maxl)
continue;
strcat(line, " ");
if(extf->cmd->suffix[0]) {
strcat(line, "suffix=");
Text_shellsafe(extf->cmd->suffix, line, 1);
if((int) strlen(line) > maxl)
continue;
strcat(line, ":");
}
if(extf->cmd->behavior & 8)
strcat(line, "remove_suffix:");
if(extf->cmd->behavior & 1)
strcat(line, "if_nonempty:");
if(extf->cmd->behavior & 2)
strcat(line, "if_reduction:");
if(extf->cmd->behavior & 4)
strcat(line, "if_block_reduction:");
sprintf(line + strlen(line), "used=%.f ", (double) extf->cmd->refcount);
if((int) strlen(line) > maxl)
continue;
Text_shellsafe(extf->cmd->path, line, 1);
if((int) strlen(line) > maxl)
continue;
for(i= 1; i < extf->cmd->argc; i++) {
strcat(line, " ");
Text_shellsafe(extf->cmd->argv[i], line, 1);
if((int) strlen(line) > maxl)
break;
}
if(i < extf->cmd->argc)
continue;
strcat(line, " --\n");
Xorriso_status_result(xorriso, filter, fp, flag&2);
}
if(xorriso->filter_list_closed) {
strcpy(line, "-close_filter_list\n");
Xorriso_status_result(xorriso, filter, fp, flag&2);
}
return(1);
}
int Xorriso_set_zisofs_params(struct XorrisO *xorriso, int flag)
{
int ret;
struct iso_zisofs_ctrl ctrl;
ctrl.version= 0;
ctrl.compression_level= xorriso->zlib_level;
if(xorriso->zisofs_block_size == (1 << 16))
ctrl.block_size_log2= 16;
else if(xorriso->zisofs_block_size == (1 << 17))
ctrl.block_size_log2= 17;
else
ctrl.block_size_log2= 15;
ret= iso_zisofs_set_params(&ctrl, 0);
Xorriso_process_msg_queues(xorriso,0);
if(ret < 0) {
Xorriso_report_iso_error(xorriso, "", ret,
"Error when setting zisofs parameters", 0, "FAILURE", 1);
return(0);
}
return(1);
}
int Xorriso_status_zisofs(struct XorrisO *xorriso, char *filter, FILE *fp,
int flag)
/*
bit0= do only report non-default settings
bit1= do only report to fp
*/
{
off_t ziso_count= 0, osiz_count= 0;
off_t gzip_count= 0, gunzip_count= 0;
iso_zisofs_get_refcounts(&ziso_count, &osiz_count, 0);
iso_gzip_get_refcounts(&gzip_count, &gunzip_count, 0);
if((flag & 1) && xorriso->zlib_level == xorriso->zlib_level_default &&
xorriso->zisofs_block_size == xorriso->zisofs_block_size_default &&
xorriso->zisofs_by_magic == 0 &&
ziso_count == 0 && osiz_count == 0 &&
gzip_count == 0 && gunzip_count == 0) {
if(filter == NULL)
return(2);
if(filter[0] == 0)
return 2;
}
sprintf(xorriso->result_line,
"-zisofs level=%d:block_size=%dk:by_magic=%s:ziso_used=%.f:osiz_used=%.f",
xorriso->zlib_level, xorriso->zisofs_block_size / 1024,
xorriso->zisofs_by_magic ? "on" : "off",
(double) ziso_count, (double) osiz_count);
sprintf(xorriso->result_line + strlen(xorriso->result_line),
":gzip_used=%.f:gunzip_used=%.f\n",
(double) gzip_count, (double) gunzip_count);
Xorriso_status_result(xorriso, filter, fp, flag&2);
return(1);
}
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