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/*
* btscanner - Displays the output of Bluetooth scans
* Copyright (C) 2003 Pentest Limited
*
* Written 2003 by Tim Hurman <timh at pentest.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY
* RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE
* FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY
* DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
* COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS SOFTWARE
* IS DISCLAIMED.
*/
/*
* cfg.c: Config options
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDARG_H
#include <stdarg.h>
#endif
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_LIBXML_PARSER_H
#include <libxml/parser.h>
#endif
#ifdef HAVE_LIBXML_TREE_H
#include <libxml/tree.h>
#endif
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <cfg.h>
#include <log.h>
#include <misc.h>
/* note to self. I hate myself for using XML in a config file */
/* globals */
static char *cfg_log = NULL;
static char *cfg_oui = NULL;
static char *cfg_store = NULL;
static char *cfg_file = CFG_FILE;
/* rangedef head */
static rangedef_t *cfg_ranges = NULL;
static size_t cfg_ranges_sz = 0;
/* copy a string value */
char *cfg_copy_content(xmlNode *node)
{
char *s, *h;
size_t hlen, len;
if (!node->children || !node->children->content) {
fprintf(stderr, "%s(): \'log\' item found but no content\n",
__FUNCTION__);
return NULL;
}
/* do we have to expand $HOME? */
if ('~' == node->children->content[0]) {
h = getenv("HOME");
if (!h) {
fprintf(stderr, "%s(): cannot expand \'~\', $HOME not defined\n",
__FUNCTION__);
return NULL;
}
hlen = strlen(h);
len = strlen((char*)node->children->content) + hlen;
s = (char*)malloc(sizeof(char)*(len+1));
if (!s) {
fprintf(stderr, "%s::malloc(): %s\n", __FUNCTION__,
strerror(errno));
return NULL;
}
strncpy(s, h, len);
strncpy(s+hlen, (char*)node->children->content+1, len - hlen);
if ('/' == s[len-1]) s[len-1] = 0; /* no trailing '/' */
} else {
s=strdup((char*)node->children->content);
if (!s) {
fprintf(stderr, "%s::xmlCharStrdup(): %s\n",
__FUNCTION__, strerror(errno));
return NULL;
}
}
return s;
}
/* parse a files node */
int cfg_parse_files(xmlNode *node)
{
xmlNode *n;
if (!node || !node->children) return 1;
for(n=node->children; n; n=n->next) {
if (n->type != XML_ELEMENT_NODE) continue;
if (!xmlStrncmp((const xmlChar*)"log", n->name, 3)) {
cfg_log = cfg_copy_content(n);
} else if (!xmlStrncmp((const xmlChar*)"oui", n->name, 3)) {
cfg_oui = cfg_copy_content(n);
} else if (!xmlStrncmp((const xmlChar*)"store", n->name, 5)) {
cfg_store = cfg_copy_content(n);
}
}
if (!cfg_log || !cfg_oui || !cfg_store) {
fprintf(stderr, "%s(): Not all file variables were defined\n",
__FUNCTION__);
return 1;
}
return 0;
}
/* parse a rangedef */
int cfg_parse_rangedef(xmlNode *node, rangedef_t *rd)
{
int ret;
xmlChar *p;
xmlNode *n;
bdaddr_t bd;
if (!node || !node->children) return 1;
ret = 1;
memset(rd, 0, sizeof(rangedef_t));
/* get the attribs */
p = xmlGetProp(node, (xmlChar*)"start");
if (!p) {
fprintf(stderr, "%s(): Mandatory start attribute not found\n",
__FUNCTION__);
goto cfg_parse_rangedef_leave;
}
str2ba((const char*)p, &bd);
rd->start = bd2int(&bd);
xmlFree(p);
p = xmlGetProp(node, (xmlChar*)"end");
if (!p) {
fprintf(stderr, "%s(): Mandatory end attribute not found\n",
__FUNCTION__);
goto cfg_parse_rangedef_leave;
}
str2ba((const char*)p, &bd);
rd->end = bd2int(&bd);
xmlFree(p);
/* check for a good start/end value */
if (rd->start > rd->end) {
fprintf(stderr,
"%s(): start address is greater than the end address",
__FUNCTION__);
goto cfg_parse_rangedef_leave;
}
/* go through each of the specified flags */
for (n=node->children; n; n=n->next) {
if (n->type != XML_ELEMENT_NODE) continue;
if (!xmlStrncmp((const xmlChar*)"vulnerabilities", n->name, 15)) {
if (NULL != n->children) {
rd->vulns = strdup((char*)n->children->content);
if (!rd->vulns) {
fprintf(stderr, "%s::xmlCharStrdup(): %s\n",
__FUNCTION__, strerror(errno));
}
}
} else if (!xmlStrncmp((const xmlChar*)"name", n->name, 4))
rd->sf |= SF_NAME;
else if (!xmlStrncmp((const xmlChar*)"hci", n->name, 3))
rd->sf |= SF_HCI;
else if (!xmlStrncmp((const xmlChar*)"rssi", n->name, 4))
rd->sf |= SF_RSSI;
else if (!xmlStrncmp((const xmlChar*)"lq", n->name, 2))
rd->sf |= SF_LQ;
else if (!xmlStrncmp((const xmlChar*)"txpwr", n->name, 5))
rd->sf |= SF_TXPWR;
else if (!xmlStrncmp((const xmlChar*)"sdp", n->name, 3))
rd->sf |= SF_SDP;
}
ret = 0;
/* go away */
cfg_parse_rangedef_leave:
return ret;
}
/* parse the contents of a root node */
int cfg_parse_root(xmlNode *node)
{
xmlNode *n;
int ret = 0;
for(n=node; n; n=n->next) {
if (n->type != XML_ELEMENT_NODE) continue;
if (!xmlStrncmp((const xmlChar*)"files", n->name, 5)) {
ret=cfg_parse_files(n);
if (ret) break;
} else if (!xmlStrncmp((const xmlChar*)"rangedef", n->name, 8)) {
/* make the rangedef bigger */
cfg_ranges_sz++;
cfg_ranges = (rangedef_t*)realloc(cfg_ranges,
sizeof(rangedef_t)*cfg_ranges_sz);
if (!cfg_ranges) {
fprintf(stderr, "%s::realloc(): %s\n", __FUNCTION__,
strerror(errno));
ret = 1;
break;
}
/* eval the rangedef */
ret=cfg_parse_rangedef(n, &(cfg_ranges[cfg_ranges_sz-1]));
if (ret) break;
}
}
return ret;
}
/* output an error from the XML parser */
void cfg_xml_err(void *ctx, const char *fmt, ...)
{
va_list ap;
ctx=ctx;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
/* parse the XML in a config file */
int cfg_parse_xml(char *filename)
{
xmlParserCtxt *ctxt = NULL;
xmlNode *root_element = NULL;
xmlNode *n = NULL;
xmlDoc *doc = NULL;
struct stat sbuf;
int ret = 1;
if (filename)
cfg_file = filename;
/* does it exist */
if (stat(cfg_file, &sbuf)) {
fprintf(stderr, "%s::stat(): %s\n", __FUNCTION__, strerror(errno));
return 1;
}
if ((sbuf.st_mode & S_IRUSR) != S_IRUSR) {
fprintf(stderr,
"%s::stat(): config file is not readable\n", __FUNCTION__);
return 1;
}
/* new context if you please */
ctxt = xmlNewParserCtxt();
if (!ctxt) {
fprintf(stderr, "%s::xmlNewParserCtxt(): context allocation failed\n",
__FUNCTION__);
goto cfg_parse_xml_leave;
}
/* parse the doc */
doc = xmlCtxtReadFile(ctxt, cfg_file, NULL,
XML_PARSE_PEDANTIC|XML_PARSE_DTDVALID|XML_PARSE_DTDLOAD);
if (!doc) {
fprintf(stderr,"%s::xmlCtxtReadFile(): failed to parse config file\n",
__FUNCTION__);
goto cfg_parse_xml_leave;
}
/* was there a DTD? */
if (!doc->intSubset) {
fprintf(stderr, "%s(): no DTD was specified in the config file\n",
__FUNCTION__);
goto cfg_parse_xml_leave;
}
/* the root element, if you please */
root_element = xmlDocGetRootElement(doc);
if (!root_element) {
fprintf(stderr, "%s(): could not locate root element\n", __FUNCTION__);
goto cfg_parse_xml_leave;
}
/* evaluate the top level elements */
for (ret=0,n=root_element; n; n=n->next) {
if (n->type != XML_ELEMENT_NODE) continue;
if (!xmlStrncmp((const xmlChar*)"btscanner", n->name, 9)) {
ret = cfg_parse_root(n->children);
if(ret) break;
}
}
cfg_parse_xml_leave:
if (doc) xmlFreeDoc(doc);
if (ctxt) xmlFreeParserCtxt(ctxt);
return ret;
}
/* read a config file */
int cfg_parsefile(char *filename)
{
size_t i;
uint64_t cv = 0xffffffffffff;
/* set up the XML */
xmlSetGenericErrorFunc(stdout, NULL);
xmlSetStructuredErrorFunc(stdout, NULL);
/* parse */
if(cfg_parse_xml(filename)) {
fprintf(stderr, "%s::cfg_parse_xml(): parse failed\n", __FUNCTION__);
return 1;
}
/* check make sure we have a full global range */
for (i=0; i < cfg_ranges_sz; i++ ) {
if (0 == cfg_ranges[i].start && cv == cfg_ranges[i].end)
break;
}
if (i == cfg_ranges_sz) {
fprintf(stderr, "%s(): No global rangedef was found\n", __FUNCTION__);
return 1;
}
return 0;
}
/* tidy up */
int cfg_cleanup(void)
{
size_t i;
for (i=0; i < cfg_ranges_sz; i++) {
if (NULL != cfg_ranges[i].vulns)
free(cfg_ranges[i].vulns);
}
free(cfg_ranges);
cfg_ranges = NULL;
if (cfg_log) free(cfg_log);
if (cfg_oui) free(cfg_oui);
if (cfg_store) free(cfg_store);
cfg_log = cfg_oui = cfg_store = NULL;
return 0;
}
/* get the file locations */
const char *cfg_log_filename(void)
{
return cfg_log;
}
const char *cfg_oui_filename(void)
{
return cfg_oui;
}
const char *cfg_store_filename(void)
{
return cfg_store;
}
/* get a rangedef for a particular address */
rangedef_t *cfg_get_range(uint64_t did)
{
rangedef_t *ret = NULL;
size_t i;
for (i=0; i < cfg_ranges_sz; i++ ) {
/* in range */
if (did < cfg_ranges[i].start || cfg_ranges[i].end < did) continue;
/* if this is our first find, assign it */
if (!ret) {
ret = &(cfg_ranges[i]);
continue;
}
/* if cfg_ranges[i] has a smaller range, this is chosen */
if ( (cfg_ranges[i].end - cfg_ranges[i].start) <
(ret->end - ret->start))
ret = &(cfg_ranges[i]);
}
/* should never be NULL */
return ret;
}
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