static int
write_log_page(struct file *file, struct log_param *lp)
{
struct file_header hdr;
uint16_t region;
coffee_page_t log_page;
int16_t log_record;
uint16_t log_record_size;
uint16_t log_records;
cfs_offset_t offset;
struct log_param lp_out;
read_header(&hdr, file->page);
adjust_log_config(&hdr, &log_record_size, &log_records);
region = modify_log_buffer(log_record_size, &lp->offset, &lp->size);
log_page = 0;
if(HDR_MODIFIED(hdr)) {
/* A log structure has already been created. */
log_page = hdr.log_page;
log_record = find_next_record(file, log_page, log_records);
if(log_record >= log_records) {
/* The log is full; merge the log. */
PRINTF(("Coffee: Merging the file %s with its log\n", hdr.name));
return merge_log(file->page, 0);
}
} else {
/* Create a log structure. */
log_page = create_log(file, &hdr);
if(log_page == INVALID_PAGE) {
return -1;
}
PRINTF(("Coffee: Created a log structure for file %s at page %u\n",
hdr.name, (unsigned)log_page));
hdr.log_page = log_page;
log_record = 0;
}
{
char copy_buf[log_record_size];
lp_out.offset = offset = region * log_record_size;
lp_out.buf = copy_buf;
lp_out.size = log_record_size;
if((lp->offset > 0 || lp->size != log_record_size) &&
read_log_page(&hdr, log_record, &lp_out) < 0) {
COFFEE_READ(copy_buf, sizeof(copy_buf),
absolute_offset(file->page, offset));
}
memcpy(©_buf[lp->offset], lp->buf, lp->size);
/*
* Write the region number in the region index table.
* The region number is incremented to avoid values of zero.
*/
offset = absolute_offset(log_page, 0);
++region;
COFFEE_WRITE(®ion, sizeof(region),
offset + log_record * sizeof(region));
offset += log_records * sizeof(region);
COFFEE_WRITE(copy_buf, sizeof(copy_buf),
offset + log_record * log_record_size);
file->record_count = log_record + 1;
}
return lp->size;
}
bool resolver::parse_message(msg& msg)
{
if ((size_t) (msg.end - msg.data) <= sizeof(header)) {
return false;
}
if (!parse_header(msg)) {
return false;
}
if (msg.h->ancount == 0) {
return false;
}
if (!find_first_record(msg)) {
return false;
}
dns_entry entry;
entry.name = msg.name;
entry.namelen = msg.namelen;
red_black_tree<dns_entry>::iterator it;
if (!_M_cache.find(entry, it)) {
// Name not found in the cache.
return false;
}
dns_entry* e = it.data;
msg.narecords = 0;
msg.cnamelen = 0;
for (unsigned short i = msg.h->ancount; (msg.ptr < msg.end) && (i > 0); i--) {
rr rr;
if (!find_next_record(msg, rr)) {
return false;
}
if (!process_record(msg, rr)) {
return false;
}
}
time_t now = time(NULL);
if (msg.narecords == 1) {
// If not the original request...
if (e->cnamelen > 0) {
// The domain name of the original request is in e->cname.
red_black_tree<dns_entry>::iterator itcname;
if (!find(e->cname, e->cnamelen, itcname)) {
_M_cache.erase(it);
return false;
}
_M_cache.erase(it);
e = itcname.data;
}
struct address* addr = msg.arecords;
e->address.addr = addr->addr;
e->address.expire = now + addr->expire;
e->address.preference = addr->preference;
e->addresses = &e->address;
e->naddresses = 1;
e->status = STATUS_VALID;
return true;
} else if (msg.narecords > 1) {
// If not the original request...
if (e->cnamelen > 0) {
// The domain name of the original request is in e->cname.
red_black_tree<dns_entry>::iterator itcname;
if (!find(e->cname, e->cnamelen, itcname)) {
_M_cache.erase(it);
return false;
}
_M_cache.erase(it);
e = itcname.data;
}
if ((e->addresses = (struct address*) malloc(msg.narecords * sizeof(struct address))) == NULL) {
_M_cache.erase(it);
return false;
}
struct address* addr = msg.arecords;
for (unsigned short i = 0; i < msg.narecords; i++, addr++) {
e->addresses[i].addr = addr->addr;
e->addresses[i].expire = now + addr->expire;
e->addresses[i].preference = addr->preference;
}
e->naddresses = msg.narecords;
e->status = STATUS_VALID;
return true;
} else if (msg.cnamelen > 0) {
dns_entry* ecname;
// If not the original request...
if (e->cnamelen > 0) {
// The domain name of the original request is in e->cname.
char* cname = e->cname;
unsigned short cnamelen = e->cnamelen;
red_black_tree<dns_entry>::iterator itcname;
if (!find(cname, cnamelen, itcname)) {
_M_cache.erase(it);
return false;
}
e->cnamelen = 0;
_M_cache.erase(it);
if (++itcname.data->recursion > MAX_RECURSION) {
_M_cache.erase(itcname);
free(cname);
return false;
}
if (!add_to_cache(msg.cname, msg.cnamelen, (rr_type) msg.type, &itcname)) {
_M_cache.erase(itcname);
free(cname);
return false;
}
ecname = itcname.data;
ecname->cname = cname;
ecname->cnamelen = cnamelen;
} else {
red_black_tree<dns_entry>::iterator itcname;
if (!add_to_cache(msg.cname, msg.cnamelen, (rr_type) msg.type, &itcname)) {
_M_cache.erase(it);
return false;
}
ecname = itcname.data;
if ((ecname->cname = (char*) malloc(msg.namelen)) == NULL) {
_M_cache.erase(itcname);
_M_cache.erase(it);
return false;
}
memcpy(ecname->cname, msg.name, msg.namelen);
ecname->cnamelen = msg.namelen;
}
return make_request(ecname->name, ecname->namelen, (rr_type) ecname->type, true);
} else {
return false;
}
}