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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef MAR_H__
#define MAR_H__
#include "mozilla/Assertions.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/* We have a MAX_SIGNATURES limit so that an invalid MAR will never
* waste too much of either updater's or signmar's time.
* It is also used at various places internally and will affect memory usage.
* If you want to increase this value above 9 then you need to adjust parsing
* code in tool/mar.c.
*/
#define MAX_SIGNATURES 8
#ifdef __cplusplus
static_assert(MAX_SIGNATURES <= 9, "too many signatures");
#else
MOZ_STATIC_ASSERT(MAX_SIGNATURES <= 9, "too many signatures");
#endif
struct ProductInformationBlock {
const char *MARChannelID;
const char *productVersion;
};
/**
* The MAR item data structure.
*/
typedef struct MarItem_ {
struct MarItem_ *next; /* private field */
uint32_t offset; /* offset into archive */
uint32_t length; /* length of data in bytes */
uint32_t flags; /* contains file mode bits */
char name[1]; /* file path */
} MarItem;
#define TABLESIZE 256
struct MarFile_ {
FILE *fp;
MarItem *item_table[TABLESIZE];
};
typedef struct MarFile_ MarFile;
/**
* Signature of callback function passed to mar_enum_items.
* @param mar The MAR file being visited.
* @param item The MAR item being visited.
* @param data The data parameter passed by the caller of mar_enum_items.
* @return A non-zero value to stop enumerating.
*/
typedef int (* MarItemCallback)(MarFile *mar, const MarItem *item, void *data);
/**
* Open a MAR file for reading.
* @param path Specifies the path to the MAR file to open. This path must
* be compatible with fopen.
* @return NULL if an error occurs.
*/
MarFile *mar_open(const char *path);
#ifdef _WIN32
MarFile *mar_wopen(const wchar_t *path);
#endif
/**
* Close a MAR file that was opened using mar_open.
* @param mar The MarFile object to close.
*/
void mar_close(MarFile *mar);
/**
* Find an item in the MAR file by name.
* @param mar The MarFile object to query.
* @param item The name of the item to query.
* @return A const reference to a MAR item or NULL if not found.
*/
const MarItem *mar_find_item(MarFile *mar, const char *item);
/**
* Enumerate all MAR items via callback function.
* @param mar The MAR file to enumerate.
* @param callback The function to call for each MAR item.
* @param data A caller specified value that is passed along to the
* callback function.
* @return 0 if the enumeration ran to completion. Otherwise, any
* non-zero return value from the callback is returned.
*/
int mar_enum_items(MarFile *mar, MarItemCallback callback, void *data);
/**
* Read from MAR item at given offset up to bufsize bytes.
* @param mar The MAR file to read.
* @param item The MAR item to read.
* @param offset The byte offset relative to the start of the item.
* @param buf A pointer to a buffer to copy the data into.
* @param bufsize The length of the buffer to copy the data into.
* @return The number of bytes written or a negative value if an
* error occurs.
*/
int mar_read(MarFile *mar, const MarItem *item, int offset, char *buf,
int bufsize);
/**
* Create a MAR file from a set of files.
* @param dest The path to the file to create. This path must be
* compatible with fopen.
* @param numfiles The number of files to store in the archive.
* @param files The list of null-terminated file paths. Each file
* path must be compatible with fopen.
* @param infoBlock The information to store in the product information block.
* @return A non-zero value if an error occurs.
*/
int mar_create(const char *dest,
int numfiles,
char **files,
struct ProductInformationBlock *infoBlock);
/**
* Extract a MAR file to the current working directory.
* @param path The path to the MAR file to extract. This path must be
* compatible with fopen.
* @return A non-zero value if an error occurs.
*/
int mar_extract(const char *path);
#define MAR_MAX_CERT_SIZE (16*1024) // Way larger than necessary
/* Read the entire file (not a MAR file) into a newly-allocated buffer.
* This function does not write to stderr. Instead, the caller should
* write whatever error messages it sees fit. The caller must free the returned
* buffer using free().
*
* @param filePath The path to the file that should be read.
* @param maxSize The maximum valid file size.
* @param data On success, *data will point to a newly-allocated buffer
* with the file's contents in it.
* @param size On success, *size will be the size of the created buffer.
*
* @return 0 on success, -1 on error
*/
int mar_read_entire_file(const char * filePath,
uint32_t maxSize,
/*out*/ const uint8_t * *data,
/*out*/ uint32_t *size);
/**
* Verifies a MAR file by verifying each signature with the corresponding
* certificate. That is, the first signature will be verified using the first
* certificate given, the second signature will be verified using the second
* certificate given, etc. The signature count must exactly match the number of
* certificates given, and all signature verifications must succeed.
* We do not check that the certificate was issued by any trusted authority.
* We assume it to be self-signed. We do not check whether the certificate
* is valid for this usage.
*
* @param mar The already opened MAR file.
* @param certData Pointer to the first element in an array of certificate
* file data.
* @param certDataSizes Pointer to the first element in an array for size of
* the cert data.
* @param certCount The number of elements in certData and certDataSizes
* @return 0 on success
* a negative number if there was an error
* a positive number if the signature does not verify
*/
int mar_verify_signatures(MarFile *mar,
const uint8_t * const *certData,
const uint32_t *certDataSizes,
uint32_t certCount);
/**
* Reads the product info block from the MAR file's additional block section.
* The caller is responsible for freeing the fields in infoBlock
* if the return is successful.
*
* @param infoBlock Out parameter for where to store the result to
* @return 0 on success, -1 on failure
*/
int
mar_read_product_info_block(MarFile *mar,
struct ProductInformationBlock *infoBlock);
#ifdef __cplusplus
}
#endif
#endif /* MAR_H__ */
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