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/*
* Copyright (C) 2006,2007 Lauri Leukkunen <lle@rahina.org>
*
* Licensed under LGPL version 2.1, see top level LICENSE file for details.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef _GNU_SOURCE
#undef _GNU_SOURCE
#include <string.h>
#include <libgen.h>
#define _GNU_SOURCE
#else
#include <string.h>
#include <libgen.h>
#endif
#include <limits.h>
#include <sys/param.h>
#include <sys/file.h>
#include <assert.h>
#include <pthread.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <mapping.h>
#include <sb2.h>
extern int lua_engine_state;
struct path_entry {
struct path_entry *prev;
struct path_entry *next;
char name[PATH_MAX];
};
char *sb_decolonize_path(const char *path)
{
char *cpath, *index, *start;
char cwd[PATH_MAX];
struct path_entry list;
struct path_entry *work;
struct path_entry *new;
char *buf = NULL;
if (!path) {
return NULL;
}
buf = malloc((PATH_MAX + 1) * sizeof(char));
memset(buf, '\0', PATH_MAX + 1);
list.next = NULL;
list.prev = NULL;
work = &list;
if (path[0] != '/') {
/* not an absolute path */
memset(cwd, '\0', PATH_MAX);
if (!getcwd(cwd, PATH_MAX)) {
perror("error getting current work dir\n");
return NULL;
}
unsigned int l = (strlen(cwd) + 1 + strlen(path) + 1);
cpath = malloc((strlen(cwd) + 1
+ strlen(path) + 1) * sizeof(char));
if (!cpath)
abort();
memset(cpath, '\0', l);
strcpy(cpath, cwd);
strcat(cpath, "/");
strcat(cpath, path);
} else {
if (!(cpath = strdup(path)))
abort();
}
start = cpath + 1; /* ignore leading '/' */
while (1) {
unsigned int last = 0;
index = strstr(start, "/");
if (!index) {
last = 1;
} else {
*index = '\0';
}
if (index == start) {
goto proceed; /* skip over empty strings
resulting from // */
}
if (strcmp(start, "..") == 0) {
/* travel up one */
if (!work->prev)
goto proceed;
work = work->prev;
free(work->next);
work->next = NULL;
} else if (strcmp(start, ".") == 0) {
/* ignore */
goto proceed;
} else {
/* add an entry to our path_entry list */
if (!(new = malloc(sizeof(struct path_entry))))
abort();
memset(new->name, '\0', PATH_MAX);
new->prev = work;
work->next = new;
new->next = NULL;
strcpy(new->name, start);
work = new;
}
proceed:
if (last)
break;
*index = '/';
start = index + 1;
}
work = list.next;
while (work) {
struct path_entry *tmp;
strcat(buf, "/");
strcat(buf, work->name);
tmp = work;
work = work->next;
free(tmp);
}
return buf;
}
char *scratchbox_path(const char *func_name, const char *path)
{
char binary_name[PATH_MAX+1];
char *tmp;
memset(binary_name, '\0', PATH_MAX+1);
tmp = getenv("__SB2_BINARYNAME");
if (tmp) {
strcpy(binary_name, tmp);
} else {
strcpy(binary_name, "UNKNOWN");
}
return scratchbox_path2(binary_name, func_name, path);
}
/* make sure to use disable_mapping(m);
* to prevent recursive calls to this function
*/
char *scratchbox_path2(const char *binary_name,
const char *func_name,
const char *path)
{
char work_dir[PATH_MAX + 1];
char *tmp = NULL, *decolon_path = NULL, *mapping_mode = NULL;
char pidlink[17]; /* /proc/2^8/exe */
struct lua_instance *luaif;
switch (lua_engine_state) {
case LES_NOT_INITIALIZED:
sb2_lua_init();
break;
case LES_INIT_IN_PROCESS:
return strdup(path);
case LES_READY:
default:
/* Do nothing */
break;
}
luaif = get_lua();
if (!luaif) {
fprintf(stderr, "Something's wrong with"
" the pthreads support.\n");
exit(1);
}
if (!(mapping_mode = getenv("SBOX_MAPMODE"))) {
mapping_mode = "simple";
}
if (!path) {
SB_LOG(SB_LOGLEVEL_ERROR,
"ERROR: scratchbox_path2: path==NULL [%s]", func_name);
return NULL;
}
if (getenv("SBOX_DISABLE_MAPPING")) {
SB_LOG(SB_LOGLEVEL_DEBUG, "disabled(E): %s '%s'",
func_name, path);
return strdup(path);
}
if (luaif->mapping_disabled) {
SB_LOG(SB_LOGLEVEL_DEBUG, "disabled(%d): %s '%s'",
luaif->mapping_disabled, func_name, path);
return strdup(path);
}
disable_mapping(luaif);
decolon_path = sb_decolonize_path(path);
memset(work_dir, '\0', PATH_MAX+1);
snprintf(pidlink, sizeof(pidlink), "/proc/%i/exe", getpid());
getcwd(work_dir, PATH_MAX);
lua_getfield(luaif->lua, LUA_GLOBALSINDEX, "sbox_translate_path");
lua_pushstring(luaif->lua, mapping_mode);
lua_pushstring(luaif->lua, binary_name);
lua_pushstring(luaif->lua, func_name);
lua_pushstring(luaif->lua, work_dir);
lua_pushstring(luaif->lua, decolon_path);
lua_call(luaif->lua, 5, 1); /* five arguments, one result */
tmp = (char *)lua_tostring(luaif->lua, -1);
if (tmp) {
tmp = strdup(tmp);
}
lua_pop(luaif->lua, 1);
enable_mapping(luaif);
if (strcmp(tmp, decolon_path) == 0) {
free(decolon_path);
free(tmp);
SB_LOG(SB_LOGLEVEL_INFO, "pass: %s '%s'",
func_name, path);
return strdup(path);
} else {
free(decolon_path);
SB_LOG(SB_LOGLEVEL_INFO, "mapped: %s '%s' -> '%s'",
func_name, path, tmp);
return tmp;
}
}
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