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/*********************************************************
* Copyright (C) 2007 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no 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 Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* locationsdb.c --
*
* Provides the QueryLocationsDB routine for finding keys in the locations
* database. Because our application is a setuid binary and we want to
* minimize risk, we retain the duplicated functionality here rather than
* link against lib/unixinstall.
*/
#if !defined(sun) && !defined(__FreeBSD__) && !defined(linux)
# error This program is not supported on your platform.
#endif
#include <sys/param.h>
#include <fcntl.h>
#include <string.h>
#include <strings.h>
#include "vm_basic_types.h"
#include "wrapper.h"
/*
* Local data
*/
/*
* Mappings between queries and search strings
*/
typedef struct Mapping {
const char *answer; /* string to match for "answer FOO" */
const char *remove; /* string to match for "remove_answer FOO" */
size_t answerSize; /* size of answer buffer */
size_t removeSize; /* size of remove buffer */
} Mapping;
/*
* queryMappings between Selector => search strings. Used by QueryLocationsDB.
*/
#define ANSWER_LIBDIR "answer LIBDIR"
#define REMOVE_LIBDIR "remove_answer LIBDIR"
#define ANSWER_BINDIR "answer BINDIR"
#define REMOVE_BINDIR "remove_answer BINDIR"
static Mapping queryMappings[] = {
{ ANSWER_LIBDIR, REMOVE_LIBDIR, sizeof ANSWER_LIBDIR, sizeof REMOVE_LIBDIR },
{ ANSWER_BINDIR, REMOVE_BINDIR, sizeof ANSWER_BINDIR, sizeof REMOVE_BINDIR },
{ 0, 0, 0, 0 }
};
/*
* Global functions (definitions)
*/
/*
*----------------------------------------------------------------------------
*
* QueryLocationsDB --
*
* Based on the caller's Selector, determines the directory selected as
* "LIBDIR", "BINDIR", etc. when the Tools were last configured.
*
* Results:
* TRUE on success, FALSE on failure. queryDir is filled in on success.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------------
*/
Bool
QueryLocationsDB(const char *locations, // IN : path of locations database
Selector selector, // IN : DB query to search for
char *queryDir, // OUT: address to write dirname to
size_t queryDirSize) // IN : size of queryDir buffer
{
FILE *file = NULL;
char buf[MAXPATHLEN];
Bool found = FALSE;
Mapping *map;
if (selector < 0 || selector >= QUERY_MAX) {
Error("Internal logic error. This is a bug.");
return FALSE;
}
file = fopen(locations, "r");
if (!file) {
return FALSE;
}
map = &queryMappings[selector];
/*
* We need to inspect the entire locations database since there are both
* "answer"s and "remove_answer"s. We want to provide the last answer that
* has not been removed.
*/
while (fgets(buf, sizeof buf, file)) {
if (strncmp(buf, map->answer, map->answerSize - 1) == 0) {
char *newline;
strncpy(queryDir, buf + map->answerSize, queryDirSize);
if (queryDir[queryDirSize - 1] != '\0') {
found = FALSE;
continue;
}
/* Truncate the string at the newline character, if it's present. */
newline = strchr(queryDir, '\n');
if (newline && newline - queryDir < queryDirSize) {
*newline = '\0';
}
found = TRUE;
} else if (strncmp(buf, map->remove, map->removeSize - 1) == 0) {
found = FALSE;
}
}
fclose(file);
return found;
}
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