/**
* Verifies that the MAR file matches the current product, channel, and version
*
* @param MARChannelID The MAR channel name to use, only updates from MARs
* with a matching MAR channel name will succeed.
* If an empty string is passed, no check will be done
* for the channel name in the product information block.
* If a comma separated list of values is passed then
* one value must match.
* @param appVersion The application version to use, only MARs with an
* application version >= to appVersion will be applied.
* @return OK on success
* COULD_NOT_READ_PRODUCT_INFO_BLOCK if the product info block
* could not be read.
* MARCHANNEL_MISMATCH_ERROR if update-settings.ini's MAR
* channel ID doesn't match the MAR
* file's MAR channel ID.
* VERSION_DOWNGRADE_ERROR if the application version for
* this updater is newer than the
* one in the MAR.
*/
int
ArchiveReader::VerifyProductInformation(const char *MARChannelID,
const char *appVersion)
{
if (!mArchive) {
return ARCHIVE_NOT_OPEN;
}
ProductInformationBlock productInfoBlock;
int rv = mar_read_product_info_block(mArchive,
&productInfoBlock);
if (rv != OK) {
return COULD_NOT_READ_PRODUCT_INFO_BLOCK_ERROR;
}
// Only check the MAR channel name if specified, it should be passed in from
// the update-settings.ini file.
if (MARChannelID && strlen(MARChannelID)) {
// Check for at least one match in the comma separated list of values.
const char *delimiter = " ,\t";
// Make a copy of the string in case a read only memory buffer
// was specified. strtok modifies the input buffer.
char channelCopy[512] = { 0 };
strncpy(channelCopy, MARChannelID, sizeof(channelCopy) - 1);
char *channel = strtok(channelCopy, delimiter);
rv = MAR_CHANNEL_MISMATCH_ERROR;
while(channel) {
if (!strcmp(channel, productInfoBlock.MARChannelID)) {
rv = OK;
break;
}
channel = strtok(nullptr, delimiter);
}
}
if (rv == OK) {
/* Compare both versions to ensure we don't have a downgrade
-1 if appVersion is older than productInfoBlock.productVersion
1 if appVersion is newer than productInfoBlock.productVersion
0 if appVersion is the same as productInfoBlock.productVersion
This even works with strings like:
- 12.0a1 being older than 12.0a2
- 12.0a2 being older than 12.0b1
- 12.0a1 being older than 12.0
- 12.0 being older than 12.1a1 */
int versionCompareResult =
mozilla::CompareVersions(appVersion, productInfoBlock.productVersion);
if (1 == versionCompareResult) {
rv = VERSION_DOWNGRADE_ERROR;
}
}
free((void *)productInfoBlock.MARChannelID);
free((void *)productInfoBlock.productVersion);
return rv;
}
/**
* 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
read_product_info_block(char *path,
struct ProductInformationBlock *infoBlock)
{
int rv;
MarFile mar;
mar.fp = fopen(path, "rb");
if (!mar.fp) {
return -1;
}
rv = mar_read_product_info_block(&mar, infoBlock);
fclose(mar.fp);
return rv;
}
/**
* 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
read_product_info_block(char *path,
struct ProductInformationBlock *infoBlock)
{
int rv;
MarFile mar;
mar.fp = fopen(path, "rb");
if (!mar.fp) {
fprintf(stderr, "ERROR: could not open file in read_product_info_block()\n");
perror(path);
return -1;
}
rv = mar_read_product_info_block(&mar, infoBlock);
fclose(mar.fp);
return rv;
}
