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xml.c
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xml.c
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/*
* ProFTPD - mod_aws XML
* Copyright (c) 2016 TJ Saunders
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.
*
* As a special exemption, TJ Saunders and other respective copyright holders
* give permission to link this program with OpenSSL, and distribute the
* resulting executable, without including the source code for OpenSSL in the
* source distribution.
*/
#include "mod_aws.h"
#include "xml.h"
#include "error.h"
#ifdef HAVE_LIBXML_PARSER_H
# include <libxml/parser.h>
# include <libxml/tree.h>
#endif
static int xml_parse_opts = XML_PARSE_COMPACT|XML_PARSE_NOBLANKS|XML_PARSE_NONET|XML_PARSE_PEDANTIC;
static const char *trace_channel = "aws.xml";
static int is_text(xmlNodePtr elt) {
if (elt == NULL) {
return FALSE;
}
if (elt->type != XML_TEXT_NODE) {
pr_trace_msg(trace_channel, 2,
"unexpected non-text <%s> node (type %d)", elt->name, (int) elt->type);
return FALSE;
}
return TRUE;
}
/* XML elements */
int aws_xml_elt_get_child_count(pool *p, void *ptr, unsigned long *count) {
xmlNodePtr elt;
(void) p;
if (ptr == NULL ||
count == NULL) {
errno = EINVAL;
return -1;
}
elt = ptr;
*count = xmlChildElementCount(elt);
return 0;
}
void *aws_xml_elt_get_child(pool *p, void *ptr, const char *name,
size_t name_len) {
register unsigned long i;
xmlNodePtr elt, kid;
unsigned long count;
(void) p;
if (ptr == NULL) {
errno = EINVAL;
return NULL;
}
if (aws_xml_elt_get_child_count(p, ptr, &count) < 0) {
return NULL;
}
if (count == 0) {
errno = ENOENT;
return NULL;
}
if (name != NULL &&
name_len == 0) {
name_len = strlen(name);
}
/* Walk the children, looking for a node whose name matches the given
* name.
*/
elt = ptr;
for (i = 0, kid = elt->children; i < count && kid != NULL; i++) {
pr_signals_handle();
if (name == NULL) {
/* Simply return the next sibling. */
return kid->next;
}
if (strncmp((const char *) kid->name, name, name_len) == 0) {
return kid;
}
kid = kid->next;
}
errno = ENOENT;
return NULL;
}
void *aws_xml_elt_get_next(pool *p, void *ptr) {
xmlNodePtr elt;
(void) p;
if (ptr == NULL) {
errno = EINVAL;
return NULL;
}
elt = ptr;
return elt->next;
}
const char *aws_xml_elt_get_name(pool *p, void *ptr, size_t *name_len) {
xmlNodePtr elt;
const char *name;
if (p == NULL ||
ptr == NULL) {
errno = EINVAL;
return NULL;
}
elt = ptr;
name = (const char *) elt->name;
if (name_len != NULL) {
*name_len = strlen(name);
}
return name;
}
const char *aws_xml_elt_get_text(pool *p, void *ptr) {
xmlNodePtr elt, kid;
xmlChar *content;
char *text;
if (p == NULL ||
ptr == NULL) {
errno = EINVAL;
return NULL;
}
/* For some reason, libxml2 stores the text of an element as a child
* node of that element, with TEXT type.
*/
elt = ptr;
kid = elt->children;
if (is_text(kid) == FALSE) {
errno = EINVAL;
return NULL;
}
content = XML_GET_CONTENT(kid);
if (content == NULL) {
return NULL;
}
text = pstrdup(p, (const char *) content);
return text;
}
/* XML documents */
void *aws_xml_doc_parse(pool *p, const char *data, size_t datasz) {
xmlDocPtr doc;
if (data == NULL ||
datasz == 0) {
errno = EINVAL;
return NULL;
}
doc = xmlReadMemory(data, (int) datasz, "error.xml", NULL, xml_parse_opts);
return doc;
}
void aws_xml_doc_free(pool *p, void *xml) {
xmlDocPtr doc;
(void) p;
if (xml == NULL) {
return;
}
doc = xml;
xmlFreeDoc(doc);
}
void *aws_xml_doc_get_root_elt(pool *p, void *xml) {
xmlDocPtr doc;
xmlNodePtr elt;
(void) p;
if (xml == NULL) {
errno = EINVAL;
return NULL;
}
doc = xml;
elt = xmlDocGetRootElement(doc);
return elt;
}
/* Generic error reporting callback. */
static void xml_error_cb(void *ctx, const char *fmt, ...) {
va_list msg;
va_start(msg, fmt);
(void) pr_trace_vmsg(trace_channel, 1, fmt, msg);
va_end(msg);
}
int aws_xml_init(pool *p) {
(void) p;
/* Let libxml2 does its version self-check. */
LIBXML_TEST_VERSION
xmlInitParser();
xmlSetGenericErrorFunc(NULL, xml_error_cb);
return 0;
}
int aws_xml_free(void) {
xmlCleanupParser();
return 0;
}