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#include <arpa/inet.h>
#include <netinet/in.h>
#include <openssl/sha.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <assert.h>
#include <unistd.h>
#define LOG_MODULE "server"
#include "logger/logger.h"
#define PORT 3456
#include "server/base64.c"
#include "server/ws_key.c"
#include "server/comms.c"
#include "ipc.c"
mqd_t logging, tx, rx;
int handle_client(int client);
int main(void) {
logging = mq_open("/logs", O_WRONLY);
tx = mq_open("/server_to_engine", O_WRONLY);
rx = mq_open("/engine_to_server", O_RDONLY);
int server_fd = socket(AF_INET, SOCK_STREAM, 0);
int opt = 1;
setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_addr.s_addr = INADDR_ANY,
.sin_port = htons(PORT)
};
if (bind(server_fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
perror("bind");
return 1;
}
if (listen(server_fd, 16) < 0) {
perror("listen");
return 1;
}
log_infof("Listening on %d", PORT);
while(1) {
int client = accept(server_fd, NULL, NULL);
if (client < 0) continue;
char req[4096];
int n = recv(client, req, sizeof(req) - 1, 0);
if (n <= 0) {
log_infof("Client close");
close(client);
continue;
}
req[n] = 0;
char *key = find_websocket_key(req);
if (!key) {
close(client);
continue;
}
char accept_key[128];
websocket_accept_key(key, accept_key);
char response[512];
snprintf(
response,
sizeof(response),
"HTTP/1.1 101 Switching Protocols\r\n"
"Upgrade: websocket\r\n"
"Connection: Upgrade\r\n"
"Sec-WebSocket-Accept: %s\r\n"
"\r\n",
accept_key
);
send(client, response, strlen(response), 0);
if (fork() == 0) {
log_infof("{%d} WebSocket connected", client);
while(1) {
if (handle_client(client)) continue;
else break;
}
log_infof("{%d} WebSocket disconnected", client);
close(client);
}
}
}
int handle_client(int client) {
unsigned char hdr[2];
if (recv(client, hdr, 2, MSG_WAITALL) != 2) {
log_warnf("{%d} recv close", client)
return 0;
}
unsigned opcode = hdr[0] & 0x0F;
unsigned len = hdr[1] & 0x7F;
log_infof(
"{%d} opcode=%u len=%u masked=%u",
client,
opcode,
hdr[1] & 0x7F,
!!(hdr[1] & 0x80)
);
if (opcode == 0x8) {
unsigned char close_frame[2] = {0x88, 0x00};
send(client, close_frame, 2, 0);
log_warnf("{%d} opcode 0x8 close", client);
return 0;
}
if (opcode == 0x9) {
unsigned char pong[2] = {0x8A, 0x00};
send(client, pong, 2, 0);
return 1;
}
if (len >= 126) {
log_infof("{%d} unsupported length %u", client, len);
return 0;
}
unsigned char mask[4];
recv(client, mask, 4, MSG_WAITALL);
unsigned char payload[126];
recv(client, payload, len, MSG_WAITALL);
for (unsigned i = 0; i < len; i++)
payload[i] ^= mask[i % 4];
payload[len] = 0;
char* payload_ptr = (char*)payload;
struct strs response = handle_input(logging, tx, rx, payload_ptr, len);
unsigned char out[1024];
out[0] = 0x81;
for (int i = 0; i < response.count; i++) {
struct str item = response.data[i];
out[1] = item.len;
assert(item.len <= 1022);
memcpy(out + 2, item.msg, item.len);
send(client, out, item.len + 2, 0);
}
char end_transmission[] = "END-TRANSMISSION";
int n = strlen(end_transmission);
out[1] = n;
memcpy(out + 2, end_transmission, n);
send(client, out, n + 2, 0);
return 1;
}
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