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bcc_server.c
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392 lines (349 loc) · 10.4 KB
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#include <stdio.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <time.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <syslog.h>
#include <string.h>
#include <bcc/bcc.h>
#include "sha1.h"
#include "base64.h"
#include "ws_protocol.h"
#include "bcc_server.h"
#define CLIENTPORT 48300
#define BROADPORT 6666
#define MAXBUFLEN 5120
#define MAXCLIENTS 30
//globals
const char *broadcastaddress = "192.168.1.255";
int broadcastSockID;
struct BCC_User *users;
int numClientSockets = 0;
struct sockaddr_in broadcastAddr;
//CODE
void error(char *msg)
{
perror(&msg[0]);
//exit(1);
}
void logStr(char *str)
{
//no log because of daemon
//printf("%s\n", str);
}
int main(int argc, char *argv[])
{
if(argc >= 2) broadcastaddress = argv[1];
//daemon
pid_t pid, sid;
pid = fork();
if (pid != 0) {
exit(EXIT_FAILURE);
}
sid = setsid();
if (sid < 0) {
exit(EXIT_FAILURE);
}
//listening broadcasts in new thread
pthread_t pth;
pthread_create(&pth,NULL, listenBroadcast, NULL);
//init socket to send broadcasts
initBroadcastSocket();
//listen for incomming connections
listenSocketServer(argc, argv);
return 1;
}
char *packFrame(char *msg)
{
int len = 1+strlen(msg)+1+4;
int pos = 2;
if(strlen(msg) >= 126 && strlen(msg) <= 65535) {len += 3; pos += 2;}
char *frame = malloc(len+1);
frame[0] = (char)129;
if(strlen(msg) < 125)
{
frame[1] = (int)strlen(msg);
}
else if(strlen(msg) >= 126 && strlen(msg) <= 65535)
{
frame[1] = (char)126;
frame[2] = (char)((strlen(msg) >> 8) & 255);
frame[3] = (char)(strlen(msg) & 255);
}
strcpy(frame+pos, msg);
frame[len-3] = '\r';
frame[len-2] = '\n';
frame[len-1] = '\0';
return frame;
}
void writeFrame(int sock, char *s)
{
char *s2;
s2 = packFrame(s);
write(sock, s2, strlen(s2));
free(s2);
}
struct BCC_User* getUserWithSocket(int socket)
{
struct BCC_User *user = users;
while (user != NULL)
{
if(user->socket == socket) return user;
user = user->next;
}
}
struct BCC_User* getUserWithNext(struct BCC_User *u)
{
struct BCC_User *user = users;
while (user != NULL)
{
if(user->next == u) return user;
user = user->next;
}
}
void closeSocket(int socket)
{
//remove socket
struct BCC_User *user = getUserWithSocket(socket);
if(user == NULL) return;
struct BCC_User *parent = getUserWithNext(user);
if(parent != NULL)
{
if(user->next != NULL) parent->next = user->next;
else parent->next = NULL;
}else
{
if(user->next != NULL) users = users->next;
else users = NULL;
}
close(socket);
logStr("socket closed");
free(user);
numClientSockets--;
}
void replace(char* c, int len, char cfrom, char cto)
{
for (int i = 0; i < len; ++i)
{
if(c[i] == cfrom) c[i] = cto;
}
}
//MAIN
void* clientMain(void *arg)
{
char buffer[MAXBUFLEN];
int n;
int socket = *(int*)arg;
struct BCC_User *user = getUserWithSocket(socket);
while(1)
{
memset((char *) &buffer, '\0', MAXBUFLEN);
n = read(socket,&buffer,MAXBUFLEN-1);
if(n == 0 || (int)(buffer[0] & 0x0F) == 0)
{
closeSocket(socket);
break;
}
int opcode = (int)(buffer[0] & 0x0F);
//text
if(opcode == 1)
{
int len = 0;
uint8_t *outBuffer = parse((const uint8_t*)buffer, n, &len);
if(outBuffer == NULL)
{
logStr("ERROR reading / parsing frame failed");
continue;
};
if (n < 0) logStr("ERROR reading socket failed");
replace((char*)outBuffer, len, '\\', ' ');
replace((char*)outBuffer, len, '<', ' ');
replace((char*)outBuffer, len, '>', ' ');
json_object *json = json_tokener_parse((char*)outBuffer);
char *nick;
char *msg;
json_object_object_foreach(json, key, val)
{
const char *v = json_object_get_string(val);
if (strcmp(key, "nick") == 0) {
nick = malloc(strlen(v)+1);
strcpy(nick, v);
nick[strlen(v)] = '\0';
} else if (strcmp(key, "msg") == 0) {
msg = malloc(strlen(v)+1);
strcpy(msg, v);
msg[strlen(v)] = '\0';
}
}
json_object_put (json);
char *ip = user->ip;
struct BccMessage *bccMsg = createMessage(nick, ip, msg);
if(bccMsg == NULL) {logStr("ERROR parsing msg"); continue;}
logStr("encoding...");
char *toSend = encodeMessage(bccMsg);
broadcastMsg(toSend);
free(toSend);
free(nick);
free(msg);
free(bccMsg->msg);
free(bccMsg);
free(outBuffer);
}else if(opcode == 10)
{
//pong!
logStr("PONG! received");
}else if(opcode == 9)
{
//ping!
logStr("PING! received");
char *pckt = packFrame("PING");
pckt[0] = (char)0b10001001;
write(socket, pckt, strlen(pckt));
free(pckt);
}else if(opcode == 8)
{
//close
write(socket, buffer, (size_t)n);
closeSocket(socket);
break;
}else
{
//wtf is thaat?
}
}
return NULL;
}
int listenSocketServer(int argc, char *argv[])
{
int serverSock, clientSock;
struct sockaddr_in serv_addr, cli_addr;
int n;
//init socket
serverSock = socket(AF_INET, SOCK_STREAM, 0);
if (serverSock < 0) logStr("ERROR socket creation failed");
memset((char *) &serv_addr, '\0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(CLIENTPORT);
//bind and listen
int reuse = -1;
if (setsockopt(serverSock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int)) < 0) logStr("ERROR port reusing failed");
if (bind(serverSock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) logStr("ERROR socket binding failed");
listen(serverSock,5);
socklen_t clilen = sizeof(cli_addr);
//accepting new clients
while(1)
{
clientSock = accept(serverSock, (struct sockaddr *) &cli_addr, &clilen);
if(numClientSockets >= MAXCLIENTS) continue;
if (clientSock < 0)
{
logStr("ERROR accepting new socket failed");
continue;
}
logStr("connected");
//handshake
handshake(clientSock);
struct BCC_User *user = malloc(sizeof(struct BCC_User));
if(user == NULL)
{
logStr("error allocating user\n");
continue;
}
if(users == NULL) users = user;
else
{
struct BCC_User *last = getUserWithNext(NULL);
last->next = user;
}
user->socket = clientSock;
strcpy(user->ip, inet_ntoa(cli_addr.sin_addr));
user->ip[39] = '\0';
user->next = NULL;
numClientSockets++;
//new thread for every client
pthread_t pth;
pthread_create(&pth,NULL, clientMain, &clientSock);
}
logStr("closing server\n");
return 0;
}
//BROADCAST
void initBroadcastSocket(void)
{
//create socket to send to broadcastadd
broadcastSockID = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (broadcastSockID < 0) logStr("ERROR broadcastsocket creation failed");
int broadcastEnable=1;
if(setsockopt(broadcastSockID, SOL_SOCKET, SO_BROADCAST, &broadcastEnable, sizeof(broadcastEnable)))
logStr("ERROR broadcastsocket creation failed");
memset(&broadcastAddr, 0, sizeof broadcastAddr);
broadcastAddr.sin_family = AF_INET;
inet_pton(AF_INET, &broadcastaddress[0], &broadcastAddr.sin_addr);
broadcastAddr.sin_port = htons(BROADPORT);
}
void broadcastMsg(char *msg)
{
//send broadcast msg
int ret = sendto(broadcastSockID, msg, strlen(msg), 0, (struct sockaddr*)&broadcastAddr, sizeof broadcastAddr);
if (ret < 0) logStr("ERROR sending broadcast");
}
void* listenBroadcast(void* argc)
{
//main loop for listening to broadcasts
int sockfd;
struct sockaddr_in my_addr;
struct sockaddr_in their_addr;
socklen_t addr_len;
int numbytes;
char buffer[MAXBUFLEN+1];
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) logStr("ERROR creating broadcast socket");
my_addr.sin_family = AF_INET;
my_addr.sin_addr.s_addr = INADDR_ANY;
my_addr.sin_port = htons(BROADPORT);
memset(&(my_addr.sin_zero), '\0', 8);
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) < 0)
logStr("ERROR binding broadcast socket");
addr_len = sizeof(struct sockaddr);
while(1)
{
memset((char *) &buffer, '\0', MAXBUFLEN);
if ((numbytes = recvfrom(sockfd, buffer, MAXBUFLEN-1 , 0, (struct sockaddr *)&their_addr, &addr_len)) < 0)
logStr("ERROR receiving broadcast");
//recreate packet from buffer
//inform every client
struct BccMessage *bccmsg = malloc(sizeof(struct BccMessage));
int ret = parseMessage(buffer, bccmsg);
if(ret != 0)
{
logStr("broadcast invalid\n");
continue;
}
//jsonmsg
json_object *json = json_object_new_object();
json_object_object_add(json, "nick", json_object_new_string(bccmsg->nick));
json_object_object_add(json, "ip", json_object_new_string(bccmsg->ipAddr));
json_object_object_add(json, "msg", json_object_new_string(bccmsg->msg));
const char *s = json_object_to_json_string(json);
char toSend[strlen(s)+1];
strcpy(toSend, s);
toSend[strlen(s)] = '\0';
struct BCC_User *user = users;
while (user != NULL)
{
int error;
socklen_t len = sizeof(error);
if(getsockopt(user->socket, SOL_SOCKET, SO_ERROR, &error, &len) == 0) writeFrame(user->socket, toSend);
user = user->next;
}
json_object_put (json);
free(bccmsg->msg);
free(bccmsg);
}
return NULL;
}