64ce5905f8
Since this function needs to allocate memory, it might fail. Check that the returned memory pointer is not NULL before trying to parse the output. Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
459 lines
9.1 KiB
C
459 lines
9.1 KiB
C
/*
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* XML wrapper for libxml2
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* Copyright (c) 2012-2013, Qualcomm Atheros, Inc.
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "includes.h"
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#define LIBXML_VALID_ENABLED
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#include <libxml/tree.h>
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#include <libxml/xmlschemastypes.h>
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#include "common.h"
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#include "base64.h"
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#include "xml-utils.h"
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struct xml_node_ctx {
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void *ctx;
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};
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struct str_buf {
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char *buf;
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size_t len;
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};
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#define MAX_STR 1000
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static void add_str(void *ctx_ptr, const char *fmt, ...)
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{
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struct str_buf *str = ctx_ptr;
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va_list ap;
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char *n;
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int len;
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n = os_realloc(str->buf, str->len + MAX_STR + 2);
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if (n == NULL)
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return;
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str->buf = n;
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va_start(ap, fmt);
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len = vsnprintf(str->buf + str->len, MAX_STR, fmt, ap);
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va_end(ap);
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if (len >= MAX_STR)
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len = MAX_STR - 1;
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str->len += len;
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str->buf[str->len] = '\0';
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}
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int xml_validate(struct xml_node_ctx *ctx, xml_node_t *node,
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const char *xml_schema_fname, char **ret_err)
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{
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xmlDocPtr doc;
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xmlNodePtr n;
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xmlSchemaParserCtxtPtr pctx;
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xmlSchemaValidCtxtPtr vctx;
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xmlSchemaPtr schema;
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int ret;
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struct str_buf errors;
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if (ret_err)
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*ret_err = NULL;
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doc = xmlNewDoc((xmlChar *) "1.0");
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if (doc == NULL)
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return -1;
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n = xmlDocCopyNode((xmlNodePtr) node, doc, 1);
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if (n == NULL) {
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xmlFreeDoc(doc);
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return -1;
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}
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xmlDocSetRootElement(doc, n);
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os_memset(&errors, 0, sizeof(errors));
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pctx = xmlSchemaNewParserCtxt(xml_schema_fname);
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xmlSchemaSetParserErrors(pctx, (xmlSchemaValidityErrorFunc) add_str,
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(xmlSchemaValidityWarningFunc) add_str,
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&errors);
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schema = xmlSchemaParse(pctx);
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xmlSchemaFreeParserCtxt(pctx);
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vctx = xmlSchemaNewValidCtxt(schema);
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xmlSchemaSetValidErrors(vctx, (xmlSchemaValidityErrorFunc) add_str,
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(xmlSchemaValidityWarningFunc) add_str,
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&errors);
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ret = xmlSchemaValidateDoc(vctx, doc);
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xmlSchemaFreeValidCtxt(vctx);
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xmlFreeDoc(doc);
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xmlSchemaFree(schema);
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if (ret == 0) {
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os_free(errors.buf);
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return 0;
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} else if (ret > 0) {
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if (ret_err)
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*ret_err = errors.buf;
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else
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os_free(errors.buf);
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return -1;
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} else {
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if (ret_err)
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*ret_err = errors.buf;
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else
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os_free(errors.buf);
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return -1;
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}
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}
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int xml_validate_dtd(struct xml_node_ctx *ctx, xml_node_t *node,
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const char *dtd_fname, char **ret_err)
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{
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xmlDocPtr doc;
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xmlNodePtr n;
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xmlValidCtxt vctx;
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xmlDtdPtr dtd;
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int ret;
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struct str_buf errors;
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if (ret_err)
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*ret_err = NULL;
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doc = xmlNewDoc((xmlChar *) "1.0");
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if (doc == NULL)
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return -1;
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n = xmlDocCopyNode((xmlNodePtr) node, doc, 1);
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if (n == NULL) {
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xmlFreeDoc(doc);
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return -1;
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}
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xmlDocSetRootElement(doc, n);
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os_memset(&errors, 0, sizeof(errors));
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dtd = xmlParseDTD(NULL, (const xmlChar *) dtd_fname);
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if (dtd == NULL) {
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xmlFreeDoc(doc);
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return -1;
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}
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os_memset(&vctx, 0, sizeof(vctx));
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vctx.userData = &errors;
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vctx.error = add_str;
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vctx.warning = add_str;
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ret = xmlValidateDtd(&vctx, doc, dtd);
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xmlFreeDoc(doc);
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xmlFreeDtd(dtd);
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if (ret == 1) {
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os_free(errors.buf);
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return 0;
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} else {
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if (ret_err)
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*ret_err = errors.buf;
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else
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os_free(errors.buf);
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return -1;
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}
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}
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void xml_node_free(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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xmlFreeNode((xmlNodePtr) node);
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}
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xml_node_t * xml_node_get_parent(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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return (xml_node_t *) ((xmlNodePtr) node)->parent;
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}
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xml_node_t * xml_node_from_buf(struct xml_node_ctx *ctx, const char *buf)
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{
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xmlDocPtr doc;
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xmlNodePtr node;
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doc = xmlParseMemory(buf, strlen(buf));
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if (doc == NULL)
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return NULL;
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node = xmlDocGetRootElement(doc);
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node = xmlCopyNode(node, 1);
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xmlFreeDoc(doc);
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return (xml_node_t *) node;
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}
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const char * xml_node_get_localname(struct xml_node_ctx *ctx,
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xml_node_t *node)
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{
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return (const char *) ((xmlNodePtr) node)->name;
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}
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char * xml_node_to_str(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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xmlChar *buf;
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int bufsiz;
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char *ret, *pos;
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xmlNodePtr n = (xmlNodePtr) node;
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xmlDocPtr doc;
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doc = xmlNewDoc((xmlChar *) "1.0");
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n = xmlDocCopyNode(n, doc, 1);
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xmlDocSetRootElement(doc, n);
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xmlDocDumpFormatMemory(doc, &buf, &bufsiz, 0);
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xmlFreeDoc(doc);
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if (!buf)
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return NULL;
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pos = (char *) buf;
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if (strncmp(pos, "<?xml", 5) == 0) {
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pos = strchr(pos, '>');
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if (pos)
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pos++;
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while (pos && (*pos == '\r' || *pos == '\n'))
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pos++;
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}
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if (pos)
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ret = os_strdup(pos);
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else
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ret = NULL;
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xmlFree(buf);
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if (ret) {
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pos = ret;
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if (pos[0]) {
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while (pos[1])
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pos++;
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}
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while (pos >= ret && *pos == '\n')
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*pos-- = '\0';
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}
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return ret;
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}
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void xml_node_detach(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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xmlUnlinkNode((xmlNodePtr) node);
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}
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void xml_node_add_child(struct xml_node_ctx *ctx, xml_node_t *parent,
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xml_node_t *child)
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{
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xmlAddChild((xmlNodePtr) parent, (xmlNodePtr) child);
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}
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xml_node_t * xml_node_create_root(struct xml_node_ctx *ctx, const char *ns_uri,
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const char *ns_prefix,
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xml_namespace_t **ret_ns, const char *name)
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{
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xmlNodePtr node;
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xmlNsPtr ns = NULL;
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node = xmlNewNode(NULL, (const xmlChar *) name);
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if (node == NULL)
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return NULL;
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if (ns_uri) {
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ns = xmlNewNs(node, (const xmlChar *) ns_uri,
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(const xmlChar *) ns_prefix);
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xmlSetNs(node, ns);
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}
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if (ret_ns)
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*ret_ns = (xml_namespace_t *) ns;
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return (xml_node_t *) node;
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}
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xml_node_t * xml_node_create(struct xml_node_ctx *ctx, xml_node_t *parent,
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xml_namespace_t *ns, const char *name)
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{
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xmlNodePtr node;
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node = xmlNewChild((xmlNodePtr) parent, (xmlNsPtr) ns,
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(const xmlChar *) name, NULL);
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return (xml_node_t *) node;
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}
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xml_node_t * xml_node_create_text(struct xml_node_ctx *ctx,
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xml_node_t *parent, xml_namespace_t *ns,
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const char *name, const char *value)
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{
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xmlNodePtr node;
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node = xmlNewTextChild((xmlNodePtr) parent, (xmlNsPtr) ns,
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(const xmlChar *) name, (const xmlChar *) value);
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return (xml_node_t *) node;
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}
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xml_node_t * xml_node_create_text_ns(struct xml_node_ctx *ctx,
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xml_node_t *parent, const char *ns_uri,
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const char *name, const char *value)
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{
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xmlNodePtr node;
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xmlNsPtr ns;
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node = xmlNewTextChild((xmlNodePtr) parent, NULL,
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(const xmlChar *) name, (const xmlChar *) value);
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ns = xmlNewNs(node, (const xmlChar *) ns_uri, NULL);
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xmlSetNs(node, ns);
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return (xml_node_t *) node;
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}
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void xml_node_set_text(struct xml_node_ctx *ctx, xml_node_t *node,
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const char *value)
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{
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/* TODO: escape XML special chars in value */
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xmlNodeSetContent((xmlNodePtr) node, (xmlChar *) value);
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}
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int xml_node_add_attr(struct xml_node_ctx *ctx, xml_node_t *node,
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xml_namespace_t *ns, const char *name, const char *value)
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{
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xmlAttrPtr attr;
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if (ns) {
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attr = xmlNewNsProp((xmlNodePtr) node, (xmlNsPtr) ns,
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(const xmlChar *) name,
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(const xmlChar *) value);
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} else {
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attr = xmlNewProp((xmlNodePtr) node, (const xmlChar *) name,
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(const xmlChar *) value);
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}
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return attr ? 0 : -1;
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}
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char * xml_node_get_attr_value(struct xml_node_ctx *ctx, xml_node_t *node,
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char *name)
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{
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return (char *) xmlGetNoNsProp((xmlNodePtr) node,
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(const xmlChar *) name);
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}
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char * xml_node_get_attr_value_ns(struct xml_node_ctx *ctx, xml_node_t *node,
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const char *ns_uri, char *name)
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{
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return (char *) xmlGetNsProp((xmlNodePtr) node, (const xmlChar *) name,
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(const xmlChar *) ns_uri);
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}
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void xml_node_get_attr_value_free(struct xml_node_ctx *ctx, char *val)
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{
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if (val)
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xmlFree((xmlChar *) val);
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}
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xml_node_t * xml_node_first_child(struct xml_node_ctx *ctx,
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xml_node_t *parent)
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{
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return (xml_node_t *) ((xmlNodePtr) parent)->children;
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}
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xml_node_t * xml_node_next_sibling(struct xml_node_ctx *ctx,
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xml_node_t *node)
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{
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return (xml_node_t *) ((xmlNodePtr) node)->next;
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}
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int xml_node_is_element(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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return ((xmlNodePtr) node)->type == XML_ELEMENT_NODE;
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}
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char * xml_node_get_text(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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if (xmlChildElementCount((xmlNodePtr) node) > 0)
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return NULL;
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return (char *) xmlNodeGetContent((xmlNodePtr) node);
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}
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void xml_node_get_text_free(struct xml_node_ctx *ctx, char *val)
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{
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if (val)
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xmlFree((xmlChar *) val);
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}
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char * xml_node_get_base64_text(struct xml_node_ctx *ctx, xml_node_t *node,
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int *ret_len)
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{
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char *txt;
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unsigned char *ret;
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size_t len;
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txt = xml_node_get_text(ctx, node);
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if (txt == NULL)
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return NULL;
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ret = base64_decode((unsigned char *) txt, strlen(txt), &len);
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if (ret_len)
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*ret_len = len;
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xml_node_get_text_free(ctx, txt);
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if (ret == NULL)
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return NULL;
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txt = os_malloc(len + 1);
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if (txt == NULL) {
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os_free(ret);
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return NULL;
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}
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os_memcpy(txt, ret, len);
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txt[len] = '\0';
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return txt;
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}
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xml_node_t * xml_node_copy(struct xml_node_ctx *ctx, xml_node_t *node)
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{
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if (node == NULL)
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return NULL;
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return (xml_node_t *) xmlCopyNode((xmlNodePtr) node, 1);
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}
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struct xml_node_ctx * xml_node_init_ctx(void *upper_ctx,
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const void *env)
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{
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struct xml_node_ctx *xctx;
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xctx = os_zalloc(sizeof(*xctx));
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if (xctx == NULL)
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return NULL;
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xctx->ctx = upper_ctx;
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LIBXML_TEST_VERSION
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return xctx;
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}
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void xml_node_deinit_ctx(struct xml_node_ctx *ctx)
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{
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xmlSchemaCleanupTypes();
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xmlCleanupParser();
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xmlMemoryDump();
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os_free(ctx);
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}
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