110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdlib.h>
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#include "private/android_filesystem_config.h"
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#include "canned_fs_config.h"
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typedef struct {
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const char* path;
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unsigned uid;
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unsigned gid;
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unsigned mode;
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uint64_t capabilities;
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} Path;
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static Path* canned_data = NULL;
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static int canned_alloc = 0;
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static int canned_used = 0;
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static int path_compare(const void* a, const void* b) {
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return strcmp(((Path*)a)->path, ((Path*)b)->path);
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}
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int load_canned_fs_config(const char* fn) {
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FILE* f = fopen(fn, "r");
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if (f == NULL) {
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fprintf(stderr, "failed to open %s: %s\n", fn, strerror(errno));
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return -1;
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}
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char line[PATH_MAX + 200];
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while (fgets(line, sizeof(line), f)) {
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while (canned_used >= canned_alloc) {
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canned_alloc = (canned_alloc+1) * 2;
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canned_data = (Path*) realloc(canned_data, canned_alloc * sizeof(Path));
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}
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Path* p = canned_data + canned_used;
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p->path = strdup(strtok(line, " "));
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p->uid = atoi(strtok(NULL, " "));
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p->gid = atoi(strtok(NULL, " "));
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p->mode = strtol(strtok(NULL, " "), NULL, 8); // mode is in octal
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p->capabilities = 0;
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char* token = NULL;
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do {
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token = strtok(NULL, " ");
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if (token && strncmp(token, "capabilities=", 13) == 0) {
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p->capabilities = strtoll(token+13, NULL, 0);
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break;
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}
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} while (token);
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canned_used++;
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}
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fclose(f);
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qsort(canned_data, canned_used, sizeof(Path), path_compare);
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printf("loaded %d fs_config entries\n", canned_used);
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return 0;
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}
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void canned_fs_config(const char* path, int dir,
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unsigned* uid, unsigned* gid, unsigned* mode, uint64_t* capabilities) {
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Path key;
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key.path = path+1; // canned paths lack the leading '/'
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Path* p = (Path*) bsearch(&key, canned_data, canned_used, sizeof(Path), path_compare);
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if (p == NULL) {
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fprintf(stderr, "failed to find [%s] in canned fs_config\n", path);
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exit(1);
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}
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*uid = p->uid;
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*gid = p->gid;
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*mode = p->mode;
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*capabilities = p->capabilities;
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#if 0
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// for debugging, run the built-in fs_config and compare the results.
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unsigned c_uid, c_gid, c_mode;
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uint64_t c_capabilities;
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fs_config(path, dir, &c_uid, &c_gid, &c_mode, &c_capabilities);
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if (c_uid != *uid) printf("%s uid %d %d\n", path, *uid, c_uid);
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if (c_gid != *gid) printf("%s gid %d %d\n", path, *gid, c_gid);
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if (c_mode != *mode) printf("%s mode 0%o 0%o\n", path, *mode, c_mode);
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if (c_capabilities != *capabilities) printf("%s capabilities %llx %llx\n", path, *capabilities, c_capabilities);
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#endif
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}
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