335 lines
8.1 KiB
C
335 lines
8.1 KiB
C
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/*
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* Copyright (C) 2007 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 <dirent.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sha1.h>
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#include <unistd.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <resolv.h>
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#include <cutils/dir_hash.h>
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/**
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* Copies, if it fits within max_output_string bytes, into output_string
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* a hash of the contents, size, permissions, uid, and gid of the file
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* specified by path, using the specified algorithm. Returns the length
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* of the output string, or a negative number if the buffer is too short.
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*/
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int get_file_hash(HashAlgorithm algorithm, const char *path,
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char *output_string, size_t max_output_string) {
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SHA1_CTX context;
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struct stat sb;
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unsigned char md[SHA1_DIGEST_LENGTH];
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int used;
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size_t n;
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if (algorithm != SHA_1) {
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errno = EINVAL;
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return -1;
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}
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if (stat(path, &sb) != 0) {
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return -1;
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}
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if (S_ISLNK(sb.st_mode)) {
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char buf[PATH_MAX];
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int len;
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len = readlink(path, buf, sizeof(buf));
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if (len < 0) {
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return -1;
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}
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SHA1Init(&context);
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SHA1Update(&context, (unsigned char *) buf, len);
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SHA1Final(md, &context);
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} else if (S_ISREG(sb.st_mode)) {
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char buf[10000];
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FILE *f = fopen(path, "rb");
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int len;
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if (f == NULL) {
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return -1;
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}
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SHA1Init(&context);
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while ((len = fread(buf, 1, sizeof(buf), f)) > 0) {
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SHA1Update(&context, (unsigned char *) buf, len);
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}
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if (ferror(f)) {
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fclose(f);
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return -1;
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}
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fclose(f);
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SHA1Final(md, &context);
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}
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if (S_ISLNK(sb.st_mode) || S_ISREG(sb.st_mode)) {
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used = b64_ntop(md, SHA1_DIGEST_LENGTH,
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output_string, max_output_string);
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if (used < 0) {
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errno = ENOSPC;
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return -1;
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}
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n = snprintf(output_string + used, max_output_string - used,
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" %d 0%o %d %d", (int) sb.st_size, sb.st_mode,
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(int) sb.st_uid, (int) sb.st_gid);
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} else {
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n = snprintf(output_string, max_output_string,
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"- - 0%o %d %d", sb.st_mode,
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(int) sb.st_uid, (int) sb.st_gid);
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}
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if (n >= max_output_string - used) {
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errno = ENOSPC;
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return -(used + n);
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}
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return used + n;
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}
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struct list {
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char *name;
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struct list *next;
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};
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static int cmp(const void *a, const void *b) {
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struct list *const *ra = a;
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struct list *const *rb = b;
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return strcmp((*ra)->name, (*rb)->name);
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}
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static int recurse(HashAlgorithm algorithm, const char *directory_path,
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struct list **out) {
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struct list *list = NULL;
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struct list *f;
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struct dirent *de;
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DIR *d = opendir(directory_path);
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if (d == NULL) {
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return -1;
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}
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while ((de = readdir(d)) != NULL) {
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if (strcmp(de->d_name, ".") == 0) {
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continue;
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}
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if (strcmp(de->d_name, "..") == 0) {
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continue;
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}
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char *name = malloc(strlen(de->d_name) + 1);
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struct list *node = malloc(sizeof(struct list));
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if (name == NULL || node == NULL) {
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struct list *next;
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for (f = list; f != NULL; f = next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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free(name);
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free(node);
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return -1;
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}
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strcpy(name, de->d_name);
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node->name = name;
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node->next = list;
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list = node;
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}
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closedir(d);
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for (f = list; f != NULL; f = f->next) {
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struct stat sb;
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char *name;
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char outstr[NAME_MAX + 100];
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char *keep;
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struct list *res;
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name = malloc(strlen(f->name) + strlen(directory_path) + 2);
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if (name == NULL) {
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struct list *next;
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for (f = list; f != NULL; f = f->next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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for (f = *out; f != NULL; f = f->next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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*out = NULL;
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return -1;
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}
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sprintf(name, "%s/%s", directory_path, f->name);
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int len = get_file_hash(algorithm, name,
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outstr, sizeof(outstr));
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if (len < 0) {
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// should not happen
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return -1;
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}
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keep = malloc(len + strlen(name) + 3);
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res = malloc(sizeof(struct list));
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if (keep == NULL || res == NULL) {
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struct list *next;
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for (f = list; f != NULL; f = f->next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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for (f = *out; f != NULL; f = f->next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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*out = NULL;
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free(keep);
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free(res);
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return -1;
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}
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sprintf(keep, "%s %s\n", name, outstr);
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res->name = keep;
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res->next = *out;
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*out = res;
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if ((stat(name, &sb) == 0) && S_ISDIR(sb.st_mode)) {
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if (recurse(algorithm, name, out) < 0) {
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struct list *next;
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for (f = list; f != NULL; f = next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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return -1;
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}
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}
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}
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struct list *next;
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for (f = list; f != NULL; f = next) {
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next = f->next;
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free(f->name);
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free(f);
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}
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}
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/**
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* Allocates a string containing the names and hashes of all files recursively
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* reached under the specified directory_path, using the specified algorithm.
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* The string is returned as *output_string; the return value is the length
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* of the string, or a negative number if there was a failure.
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*/
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int get_recursive_hash_manifest(HashAlgorithm algorithm,
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const char *directory_path,
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char **output_string) {
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struct list *out = NULL;
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struct list *r;
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struct list **list;
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int count = 0;
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int len = 0;
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int retlen = 0;
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int i;
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char *buf;
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if (recurse(algorithm, directory_path, &out) < 0) {
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return -1;
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}
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for (r = out; r != NULL; r = r->next) {
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count++;
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len += strlen(r->name);
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}
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list = malloc(count * sizeof(struct list *));
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if (list == NULL) {
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struct list *next;
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for (r = out; r != NULL; r = next) {
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next = r->next;
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free(r->name);
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free(r);
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}
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return -1;
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}
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count = 0;
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for (r = out; r != NULL; r = r->next) {
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list[count++] = r;
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}
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qsort(list, count, sizeof(struct list *), cmp);
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buf = malloc(len + 1);
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if (buf == NULL) {
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struct list *next;
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for (r = out; r != NULL; r = next) {
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next = r->next;
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free(r->name);
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free(r);
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}
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free(list);
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return -1;
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}
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for (i = 0; i < count; i++) {
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int n = strlen(list[i]->name);
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strcpy(buf + retlen, list[i]->name);
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retlen += n;
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}
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free(list);
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struct list *next;
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for (r = out; r != NULL; r = next) {
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next = r->next;
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free(r->name);
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free(r);
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}
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*output_string = buf;
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return retlen;
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}
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