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/*
Copyright (C) 2017 Paweł Redman
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "shared.h"
#include <time.h>
int server_sockfd;
static struct timespec time_ref;
uint64_t get_time(void)
{
static struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
return (uint64_t)(now.tv_sec - time_ref.tv_sec) * TIME_SECOND +
now.tv_nsec + 1;
}
static int parse_req_addr(char *begin, char *end, uint32_t *out)
{
char *p;
size_t i = 0, parts[4] = {0, 0, 0, 0};
for (p = begin; p < end; p++) {
if (*p >= '0' && *p <= '9') {
parts[i] *= 10;
parts[i] += *p - '0';
if (parts[i] > 255)
return 1;
} else if (*p == '.') {
i++;
if (i > 3)
return 1;
} else
break;
}
if (i != 3)
return 1;
*out = (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8) | parts[3];
return 0;
}
void handle_request(struct sockaddr_in *ret_addr, uint32_t query)
{
db_entry *entry;
job_t *reply_job;
uint64_t now = get_time();
DEBUG("query %08X\n", query);
entry = db_find(query);
if (!entry) {
eprintf("handle_request: out of memory\n");
return;
}
reply_job = job_create(JOB_REPLY, entry);
reply_job->ipv4 = query;
memcpy(&reply_job->ret_addr, ret_addr, sizeof(struct sockaddr_in));
if (entry->revdns.state == DB_VALID
&& entry->revdns.exp_time <= now) {
entry->revdns.state = DB_INVALID;
DEBUG("revDNS for %08X expired\n", query);
}
if (entry->whois.state == DB_VALID
&& entry->whois.exp_time <= now) {
entry->whois.state = DB_INVALID;
DEBUG("WHOIS for %08X expired\n", query);
}
if (entry->revdns.state == DB_VALID &&
entry->whois.state == DB_VALID) {
job_enqueue(reply_job);
goto out;
}
if (entry->revdns.state == DB_INVALID) {
job_t *job;
DEBUG("revDNS cache miss for %08X\n", query);
job = job_create(JOB_REVDNS, entry);
job->ipv4 = query;
job_enqueue(job);
entry->revdns.state = DB_IN_PROGRESS;
}
if (entry->whois.state == DB_INVALID) {
job_t *job;
DEBUG("WHOIS cache miss for %08X\n", query);
job = job_create(JOB_WHOIS, entry);
job->ipv4 = query;
job_enqueue(job);
entry->whois.state = DB_IN_PROGRESS;
}
eli_append(&entry->waiting_jobs, reply_job, waiting_list);
out:
pthread_mutex_unlock(&entry->mutex);
}
#define NUM_WORKERS 8 // FIXME: shouldn't be hardcoded
int main(void)
{
int error = 0; // return value
struct sockaddr_in sockaddr;
pthread_t workers[NUM_WORKERS];
size_t i;
clock_gettime(CLOCK_MONOTONIC_RAW, &time_ref);
if (lists_load("schachts.list", 0)) {
eprintf("fatal error: couldn't load the lists\n");
goto error_lists;
}
server_sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (server_sockfd == -1) {
perror("socket");
error = 1;
goto error_socket;
}
sockaddr.sin_family = AF_INET;
sockaddr.sin_addr.s_addr = INADDR_ANY;
sockaddr.sin_port = htons(1337);
if (bind(server_sockfd, (void*)&sockaddr, sizeof(sockaddr)) == -1) {
perror("bind");
error = 1;
goto error_bind;
}
for (i = 0; i < NUM_WORKERS; i++)
pthread_create(workers + i, NULL, worker_main, NULL);
while (1) {
char buffer[256];
struct sockaddr_in addr;
socklen_t addrlen = sizeof(addr);
ssize_t size;
uint32_t query;
size = recvfrom(server_sockfd, buffer, sizeof(buffer), 0,
(void*)&addr, &addrlen);
if (size == -1) {
perror("recvfrom");
goto error_recvfrom;
}
if ((ntohl(addr.sin_addr.s_addr) & LOCALHOST_MASK)
!= LOCALHOST_NETWORK)
continue;
if (size < REQUEST_HEADER_LEN)
continue;
if (memcmp(buffer, REQUEST_HEADER, REQUEST_HEADER_LEN))
continue;
if (parse_req_addr(buffer + REQUEST_HEADER_LEN, buffer + size,
&query))
continue;
handle_request(&addr, query);
}
job_quit();
for (i = 0; i < NUM_WORKERS; i++)
pthread_join(workers[i], NULL);
db_destroy();
// todo: clear all jobs
error_recvfrom:
error_bind:
shutdown(server_sockfd, SHUT_RDWR);
close(server_sockfd);
error_socket:
lists_destroy();
error_lists:
return error;
}
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