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#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <libgen.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxml/relaxng.h>
#include <libxslt/xslt.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/transform.h>
#include <libxslt/xsltutils.h>
#include "util.h"
#include "xml_helper.h"
#include "helpers.h"
char *get_output_handler_parameter(xmlNode *node, const char *name, const char *default_value, const int required) {
char *value;
DEBUG(3,("Search for attribute '%s'.\n",name));
value = (char *) xmlGetProp(node, (xmlChar *) name);
if (required == 1) {
CHECK_NULL_FATAL(value, ("Cannot find required attribute '%s' for output handler.\n", name));
DEBUG(3,("Found required attribute '%s' with value '%s'.\n",name, value));
} else if (required == 0 ) {
if (value == NULL) {
DEBUG(3,("Optional attribute '%s' not found, using default '%s'.\n",name, default_value));
if (default_value != NULL ) value=strdup(default_value);
} else {
DEBUG(3,("Found optional attribute '%s' with value '%s'.\n",name, value));
}
} else {
DEBUG(0,("I am not allowed to be here, aborting ...\n"));
exit(-1);
}
return value;
}
int output_handler_file(xmlNode *node, const xmlDocPtr doc, const char *xslt_file_name) {
char *name;
char *owner;
char *group;
char *permission;
char *param_name;
char *param_value;
struct stat stat_buffer;
char *dir_name;
char *tmp_file_name;
char *buffer;
int ret;
int fd;
xsltStylesheetPtr parsed_stylesheet = NULL;
xmlDocPtr res;
name=get_output_handler_parameter(node, "name", NULL, 1);
buffer=strdup(name);
CHECK_NULL_RETURN(buffer ,("strdup failed\n"));
dir_name=dirname(buffer);
if( (ret=stat(dir_name, &stat_buffer)) == -1) {
DEBUG(0,("stat on %s failed: %s\n",dir_name, strerror(errno)));
free(name);
return -1;
}
if(!S_ISDIR(stat_buffer.st_mode)) {
DEBUG(0,("%s is not a directory!\n",dir_name));
free(name);
return -1;
}
free(buffer);
if( (ret=lstat(name, &stat_buffer)) == -1) {
DEBUG(0,("stat on %s failed: %s\n",name, strerror(errno)));
free(name);
return -1;
}
if(!S_ISREG(stat_buffer.st_mode)) {
DEBUG(0,("%s is not a regular file!\n",name));
free(name);
return -1;
}
owner=get_output_handler_parameter(node, "owner", "root", 0);
group=get_output_handler_parameter(node, "group", "root", 0);
permission=get_output_handler_parameter(node, "permission", "0400", 0);
param_name=get_output_handler_parameter(node, "param_name", NULL, 0);
param_value=get_output_handler_parameter(node, "param_value", NULL, 0);
/* TODO: create backup copy */
tmp_file_name=(char *) malloc(strlen(name)+7);
CHECK_NULL_RETURN(tmp_file_name,("malloc failed."));
strcpy(tmp_file_name, name);
strcat(tmp_file_name, ".XXXXXX");
fd=open_temporary_file(tmp_file_name, permission, owner, group, NULL);
CHECK(fd, -1, ("Failed to open temporary file.\n"), return -1);
parsed_stylesheet = xsltParseStylesheetFile((xmlChar *) xslt_file_name);
CHECK_NULL_FATAL(parsed_stylesheet, ("Cannot parse stylesheet!\n"));
res = xsltApplyStylesheet(parsed_stylesheet, doc, NULL);
CHECK_NULL_FATAL(res, ("Cannot apply stylesheet!\n"));
ret = xsltSaveResultToFd(fd, res, parsed_stylesheet);
if (ret == -1) {
DEBUG(0, ("Cannot save result!\n"));
exit(1);
}
xmlFreeDoc(res);
xsltFreeStylesheet(parsed_stylesheet);
close(fd);
ret=rename(tmp_file_name, name);
CHECK_MINUS_ONE_RETURN(ret, ("Cannot rename %s to %s: %s\n", tmp_file_name, name, strerror(errno) ));
free(tmp_file_name);
free(name);
free(owner);
free(group);
free(permission);
free(param_name);
free(param_value);
return 0;
}
int output_handler_exec_with_args(xmlNode *node, const xmlDocPtr doc, const char *xslt_file_name) {
char *command;
char *arguments;
char *user;
char *group;
char *param_name;
char *param_value;
int ret;
struct stat stat_buffer;
xsltStylesheetPtr parsed_stylesheet = NULL;
xmlDocPtr res;
xmlChar *result_string;
int result_length;
char *cur;
char *end_of_line;
command=get_output_handler_parameter(node, "command", NULL, 1);
if( (ret=stat(command, &stat_buffer)) == -1) {
DEBUG(0,("stat on %s failed: %s\n",command, strerror(errno)));
free(command);
return -1;
}
arguments=get_output_handler_parameter(node, "arguments", NULL, 0);
user=get_output_handler_parameter(node, "user", "nobody", 0);
group=get_output_handler_parameter(node, "group", "nobody", 0);
param_name=get_output_handler_parameter(node, "param_name", NULL, 0);
param_value=get_output_handler_parameter(node, "param_value", NULL, 0);
parsed_stylesheet = xsltParseStylesheetFile((xmlChar *) xslt_file_name);
CHECK_NULL_FATAL(parsed_stylesheet, ("Cannot parse stylesheet!\n"));
res = xsltApplyStylesheet(parsed_stylesheet, doc, NULL);
CHECK_NULL_FATAL(res, ("Cannot apply stylesheet!\n"));
ret = xsltSaveResultToString(&result_string, &result_length, res, parsed_stylesheet);
if (ret == -1) {
DEBUG(0, ("Cannot save result!\n"));
exit(1);
}
xmlFreeDoc(res);
xsltFreeStylesheet(parsed_stylesheet);
cur=(char *)result_string;
while ( (end_of_line = strchr(cur, '\n'))!=NULL ) {
*end_of_line='\0';
DEBUG(3,("found argument to %s: |%s|\n",command, cur));
ret=exec_command(command, user, group, arguments, cur);
DEBUG(3,("exec_command retrun value: %d\n",ret));
cur=end_of_line+1;
};
free(result_string);
free(command);
free(arguments);
free(user);
free(group);
free(param_name);
free(param_value);
return 0;
}
int find_output_handler(const char *policy_file_name, const char *xslt_file_name) {
int i;
xmlXPathContextPtr xpath_context;
xmlXPathObjectPtr xpath_obj;
xmlDocPtr xslt_doc;
xmlDocPtr doc;
doc = xmlParseFile(policy_file_name);
CHECK(doc, NULL, ("Cannot parse file %s!\n", policy_file_name), exit(1));
xslt_doc = xmlParseFile(xslt_file_name);
CHECK(xslt_doc, NULL, ("Cannot parse file %s!\n", xslt_file_name), exit(1));
xpath_context = xmlXPathNewContext(xslt_doc);
CHECK(xpath_context, NULL, ("Error: unable to create new XPath context\n"), exit(1));
if (xmlXPathRegisterNs(xpath_context, XSLT_METADATA_NAMESPACE_PREFIX, XSLT_METADATA_NAMESPACE) != 0) {
DEBUG(0,
("Error: unable to register NS with prefix=\"%s\" and href=\"%s\"\n",
XSLT_METADATA_NAMESPACE_PREFIX, XSLT_METADATA_NAMESPACE));
xmlXPathFreeContext(xpath_context);
return 0;
}
xpath_obj = xmlXPathEvalExpression(XPATH_OUTPUT_HANDLER, xpath_context);
if (xpath_obj == NULL) {
DEBUG(0,
("Error: unable to evaluate xpath expression \"%s\"\n",
XPATH_OUTPUT_HANDLER));
xmlXPathFreeContext(xpath_context);
return 0;
}
if (xmlXPathNodeSetIsEmpty(xpath_obj->nodesetval)) {
DEBUG(0, ("Nothing found for %s\n", XPATH_OUTPUT_HANDLER));
xmlXPathFreeObject(xpath_obj);
xmlXPathFreeContext(xpath_context);
return 0;
}
for (i=0; i<xmlXPathNodeSetGetLength(xpath_obj->nodesetval); i++) {
DEBUG(3, ("found output_handler: %s\n",(char *) xpath_obj->nodesetval->nodeTab[i]->name));
print_all_attributes(xpath_obj->nodesetval->nodeTab[i]);
if ( xmlStrEqual(xpath_obj->nodesetval->nodeTab[i]->name, (xmlChar *) "file" )) {
output_handler_file(xpath_obj->nodesetval->nodeTab[i], doc, xslt_file_name);
} else if ( xmlStrEqual(xpath_obj->nodesetval->nodeTab[i]->name, (xmlChar *) "exec_with_args" )) {
output_handler_exec_with_args(xpath_obj->nodesetval->nodeTab[i], doc, xslt_file_name);
} else {
DEBUG(0, ("Unknow outout handler '%s'.\n", xpath_obj->nodesetval->nodeTab[i]->name));
xmlXPathFreeObject(xpath_obj);
xmlXPathFreeContext(xpath_context);
return -1;
}
}
xmlXPathFreeObject(xpath_obj);
xmlXPathFreeContext(xpath_context);
xmlFreeDoc(xslt_doc);
xmlFreeDoc(doc);
return 0;
}
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