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secure_server.cpp
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// Bernie Birnbaum and Shawyoun Saidon
// Comp 112 Final Project
// Tufts University
// This whole section with includes, defines, and struct definitions would
// ideally be in a seperate header files
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <string>
#include <fstream>
#include <vector>
#include <sstream>
#include <iostream>
#include <math.h>
#include <iomanip>
#include "player.h"
#include <openssl/sha.h>
#include <time.h>
#include <algorithm>
#include <random>
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/sha.h>
#include "ssl_utils.h"
using namespace std;
// Single points of reference for hard-coded parameters
#define MAXDATASIZE 400 // Only limits messages sent between users
#define MAXCLIENTS 200 // Draft with this many would run out of players however
#define IDLENGTH 20 // Includes null character
#define TEAMSIZE 12
#define ROUNDTIME 10 // Max of 255
#define PARTICIPATING_MASK 256
const float minTimeout = 50.0;
// Message types (in order in which they were incorperated into the code)
// Comments indicat use of msgID field, if any
#define HELLO 1
#define HELLO_ACK 2 // 1 if draft in progress, 0 otherwise
#define LIST_REQUEST 3
#define CLIENT_LIST 4
#define CHAT 5 // # chat sent by client
#define EXIT 6
#define ERROR 7
#define CANNOT_DELIVER 8
#define PLAYER_REQUEST 9
#define PLAYER_RESPONSE 10
#define DRAFT_REQUEST 11
#define PING 12 // # ping sent to specific client by server
#define PING_RESPONSE 13 // # of pint client is responding to
#define START_DRAFT 14
#define DRAFT_STATUS 15
#define DRAFT_STARTING 16 // Roundlength & participation mask
#define DRAFT_ROUND_START 17 // # of round that is starting
#define DRAFT_ROUND_RESULT 18 // # of round that is ending
#define DRAFT_PASS 19
#define DRAFT_END 20 // # of draft that just finished
// Header struct, agreed upon by client and server
struct header {
unsigned short type; // One of the options from above;
char sourceID[IDLENGTH];
char destID[IDLENGTH];
unsigned int dataLength;
unsigned int msgID; // Used to store info for some message types
}__attribute__((packed, aligned(1)));
#define HEADERSIZE sizeof(header)
// struct for storing info about clients
struct clientInfo {
int sock;
SSL * ssl;
char ID[IDLENGTH];
bool active;
int mode;
// In case a header isn't read all at once
int headerToRead;
char partialHeader[HEADERSIZE];
// Storage for data read from client
int dataToRead;
int totalDataExpected;
char partialData[MAXDATASIZE];
char destID[IDLENGTH];
int msgID;
// Storage for client's hashed password
int pwordToRead;
int totalPwordExpected;
char pword[65];
bool validated;
// Info about this client's pings
int pingSent;
int pingRcvd;
int pings;
struct timespec lastPingSent;
float estRTT;
float devRTT;
float timeout;
// Is this client ready for the draft to start?
bool readyToDraft;
}__attribute__((packed, aligned(1)));
// Struct for each team participating in draft
struct team
{
char owner[20];
int playersDrafted;
bool responseRecieved;
timespec adjustedTimeReceived;
playerInfo players[TEAMSIZE];
};
// Info about the draft
struct draftInfo {
int index;
int currentRound;
timespec roundEndTime;
vector<team> teams;
vector<int> order;
};
// Stroring, tracking clients
struct clientInfo clients[MAXCLIENTS];
int clientCounter = 0;
int numClients = 0; int numActiveClients = 0;
// maximum time server should wait for any client to respond
float maxDelay;
// conditions for sending pings
bool timedOut = false;
bool curRoundPingsSent = false;
bool newEntry = false;
// Tracking the status of the draft (admittedly could have been part of draftInfo struct)
int draftNum = 0;
bool startDraft = false;
bool draftStarted;
bool startNewRound = false;
struct draftInfo theDraft;
// Info on all players
vector<playerInfo> playerData;
// For estRTT, devRTT, timeout calculations
const float alpha = 0.875;
const float beta = 0.25;
// Boilerplate functions
void error(const char *msg)
{
perror(msg);
exit(1);
}
int max(int a, int b) {
if(a > b) return a;
return b;
}
int min(int a, int b) {
if(a < b) return a;
return b;
}
/* Methods are broken down into sections */
// 1. All purpose method for new read from a client
void readFromClient(int sockfd);
// 2. Methods for reading specifc parts of messages
void readHeader(struct clientInfo *curClient, int sockfd);
void readData(struct clientInfo *curClient);
void readPword(struct clientInfo *curClient);
// 3. Methods for handling particular types of messages
void handleHello(struct clientInfo *curClient);
void handleListRequest(struct clientInfo *curClient);
void handleChat(struct clientInfo *sender);
void handleExit(struct clientInfo *curClient);
void handleClientPresent(struct clientInfo *curClient, char *ID);
void handleCannotDeliver(struct clientInfo *curClient);
void handleError(struct clientInfo *curClient);
void handlePlayerRequest(struct clientInfo *curClient);
void handleDraftRequest(struct clientInfo *curClient);
void handleDraftPass(struct clientInfo *curClient);
void handleStartDraft(struct clientInfo *curClient);
void handlePingResponse(struct clientInfo *curClient);
// 4. Method for sending pings to all clients
void sendPing(struct clientInfo *curClient);
// 5. Methods called by the server to state of the draft
void sendStartDraft();
void draftNewRound();
void endDraftRound();
void endDraft();
// 6. Helper function, returns true if conditions for ending the current draft round are met
bool roundIsOver();
// 7. Helper functions for dealing with timespecs
void timespecAdd(timespec *a, timespec *b, timespec *c);
void timespecSubtract(timespec *a, timespec *b, timespec *c);
bool timespecLessthan(timespec *a, timespec *b);
// 8. Function for hashing passwords
string sha256(const string str);
fd_set active_fd_set, read_fd_set;
SSL_CTX * ctx; // Declared here so all functions can use
/********************************************************************
* Section 0: main *
********************************************************************/
int main(int argc, char *argv[]) {
srand(unsigned (time(0)));
memset(clients,0,sizeof(clients));
// TODO: Give more options than this hard coded file
playerData = readCSV("nba1516.csv");
memset(&clients, 0, sizeof(clients));
int sockfd, newsockfd, portno, pid, i;
socklen_t clilen;
struct sockaddr_in serv_addr, cli_addr;
ctx = newSSLContext();
loadPrivateAndPublicKeys(ctx, "newreq.pem", "newreq.pem");
// TODO: Flags for particular error message types
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]); // Get port number from args
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
FD_ZERO(&active_fd_set);
FD_SET(sockfd, &active_fd_set);
clilen = sizeof(cli_addr);
while(1) {
timespec curTime;
clock_gettime(CLOCK_MONOTONIC,&curTime);
// Determine timeout for select
timespec timeToEndRound;
if(draftStarted && !startNewRound) {
if(timespecLessthan(&theDraft.roundEndTime,&curTime)) {
// Time has elapsed!
fprintf(stderr, "About to endDraftRound\n");
endDraftRound();
continue; // Probably unecessary
} else {
timespecSubtract(&theDraft.roundEndTime,&curTime,&timeToEndRound);
fprintf(stderr, "Time til next round: %d.%ds\n", timeToEndRound.tv_sec,timeToEndRound.tv_nsec);
}
} else {
// Next round will never be if the draft is not going on!
timeToEndRound.tv_sec = 99999;
timeToEndRound.tv_nsec = 0;
}
timedOut = true;
// If the draft is going on, want to end as close to end of round as possible
// Otherwise wait a healthy amount more than necessary to accomodate maxDelay
int timeoutSecs = min(max(((int)(maxDelay + 1500) / 1000), 5), (timeToEndRound.tv_sec + 1) );
//fprintf(stderr, "timeoutSecs: %d\n", timeoutSecs);
struct timeval selectTimeout = {timeoutSecs,(timeToEndRound.tv_nsec / 1000)};
// Cases where we want to send pings sooner rather than later
if(startNewRound && !curRoundPingsSent) selectTimeout = {0,1000};
if(newEntry) selectTimeout = {1,0};
read_fd_set = active_fd_set;
/* Block until input arrives on one or more active sockets */
if(select(FD_SETSIZE, &read_fd_set, NULL, NULL, &selectTimeout) < 0) {
error("ERROR on select");
}
/* Service all the sockets with input pending */
for(i = 0; i < FD_SETSIZE; i++) { //FD_SETSIZE == 1024
if(FD_ISSET(i, &read_fd_set)) {
timedOut = false;
if(i == sockfd) {
/* Connection request on original socket */
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if(newsockfd < 0)
error("ERROR on accept");
/* make and insert new clientInfo record */
struct clientInfo newClient;
memset(&newClient, 0, sizeof(newClient));
newClient.sock = newsockfd;
newClient.headerToRead = HEADERSIZE;
newClient.active = true;
newClient.validated = false;
newClient.timeout = 5000;
newClient.readyToDraft = false;
newClient.ssl = SSL_new(ctx);
SSL_set_fd(newClient.ssl, newClient.sock);
if(SSL_accept(newClient.ssl) != 1)
ERR_print_errors_fp(stderr);
else
fprintf(stderr, "Handshake successful!\n");
bool inserted = false;
while(!inserted) {
if(clients[clientCounter].sock == NULL) {
clients[clientCounter] = newClient;
inserted = true;
}
clientCounter++;
numClients++;
numActiveClients++;
clientCounter = clientCounter % MAXCLIENTS;
}
fprintf(stderr, "New connection with newsockfd: %d\n", newsockfd);
// fprintf(stderr, "Server: connect from host %s, port %hu. \n", inet_ntoa(cli_addr.sin_addr), ntohs(cli_addr.sin_port));
FD_SET(newsockfd, &active_fd_set);
} else {
/* Data arriving on an already-connected socket */
readFromClient(i);
}
}
}
// If it's been quiet for long enough or we need to get the pings in now, lets ping!
if((timedOut && !draftStarted) || (startNewRound && !curRoundPingsSent)) {
for(int i = 0; i < MAXCLIENTS; i++) {
if(clients[i].active && clients[i].validated) {
// Don't ping if we're still waiting on a response...unless it's really hopeless
if((clients[i].pingSent == clients[i].pingRcvd) || ((curTime.tv_sec - clients[i].lastPingSent.tv_sec) > 30)) {
sendPing(&clients[i]);
}
}
}
if(startNewRound) {
curRoundPingsSent = true;
timedOut = false;
}
// Want to keep up the short timeouts until we get the newbie at least one ping
if(newEntry) newEntry = false;
}
// Making sure there's a chance for client input to come in before starting anything
if(startDraft && timedOut) sendStartDraft();
if(startNewRound && timedOut) draftNewRound();
}
close(sockfd);
SSL_CTX_free(ctx);
return 0;
}
/********************************************************************
* Section 1: Determine which read to use *
********************************************************************/
void readFromClient (int sockfd) {
int i;
struct clientInfo *curClient;
/* get client address based on sockfd */
for(i = 0; i < MAXCLIENTS; i++) {
if(clients[i].sock == sockfd) {
if(clients[i].active) {
curClient = &clients[i];
break;
} else {
// This is a new user
struct clientInfo newClient;
memset(&newClient, 0, sizeof(newClient));
newClient.sock = sockfd;
newClient.headerToRead = HEADERSIZE;
newClient.active = true;
newClient.validated = false;
newClient.ssl = SSL_new(ctx);
SSL_set_fd(newClient.ssl, newClient.sock);
if(SSL_accept(newClient.ssl) != 1)
ERR_print_errors_fp(stderr);
else
fprintf(stderr, "Handshake successful!\n");
bool inserted = false;
while(!inserted) {
if(clients[clientCounter].sock == 0) {
clients[clientCounter] = newClient;
inserted = true;
}
clientCounter++;
numActiveClients++;
clientCounter = clientCounter % MAXCLIENTS;
}
break;
}
}
}
/* send to appropriate read method; headerToRead should always be positive */
if(curClient->pwordToRead > 0) {
readPword(curClient);
} else if(curClient->dataToRead > 0) {
readData(curClient);
} else if(curClient->headerToRead > 0) {
readHeader(curClient, sockfd);
} else {
error("ERROR: headerToRead and dataToRead not > 0");
}
}
/********************************************************************
* Section 2: Read specific parts of messages *
********************************************************************/
void readHeader(struct clientInfo *curClient, int sockfd) {
char header_buffer[HEADERSIZE];
int nbytes;
/* retrieve what has already been read of the header */
memcpy(header_buffer, curClient->partialHeader, HEADERSIZE);
/* try to read the rest of the header */
nbytes = SSL_read(curClient->ssl, &header_buffer[HEADERSIZE-curClient->headerToRead],curClient->headerToRead);
//fprintf(stderr, "readHeader client: %s, nbytes: %d, expected readsize: %d\n",curClient->ID, nbytes,curClient->headerToRead);
if (nbytes <= 0) {
/* Read error or EOF: Socket closed */
// TODO: Pause mode
handleExit(curClient);
} else if (nbytes < curClient->headerToRead) {
/* still more to read */
curClient->headerToRead = curClient->headerToRead - nbytes;
memcpy(curClient->partialHeader, header_buffer, HEADERSIZE);
} else {
/* Parse header. */
struct header newHeader;
memcpy((char *)&newHeader, &header_buffer[0], HEADERSIZE);
newHeader.type = ntohs(newHeader.type);
newHeader.dataLength = ntohl(newHeader.dataLength);
newHeader.msgID = ntohl(newHeader.msgID);
curClient->headerToRead = HEADERSIZE;
fprintf (stderr, "Header read in: type: %hu, sourceID: %s, destID: %s, dataLength: %u, msgID: %u\n", newHeader.type, newHeader.sourceID, newHeader.destID, newHeader.dataLength, newHeader.msgID);
/* identify potential bad input */
if((strcmp(newHeader.sourceID,curClient->ID) != 0) && (strcmp(curClient->ID,"") != 0) && curClient->active) {
fprintf(stderr, "ERROR: wrong user ID in header\n");
handleError(curClient);
return;
}
if(strlen(newHeader.sourceID) >= IDLENGTH) {
fprintf(stderr, "ERROR: sourceID is too long\n");
handleError(curClient);
return;
}
if(strlen(newHeader.destID) >= IDLENGTH) {
fprintf(stderr, "ERROR: destID is too long\n");
handleError(curClient);
return;
}
if(newHeader.dataLength > MAXDATASIZE) {
fprintf(stderr, "ERROR: dataLength too large\n");
handleError(curClient);
return;
}
/* next step depends on header type */
if(newHeader.type == HELLO) {
//char pword[IDLENGTH];
//memset(pword,0,IDLENGTH);
if(newHeader.dataLength > 20) {
fprintf(stderr, "ERROR: HELLO has dataLength > 20 \n");
handleError(curClient);
return;
}
/* handle HELLO-specific bad input */
if(strcmp(curClient->ID,"") != 0) {
// If there is already and ID, this is not this client's first interaction with the server
fprintf(stderr, "ERROR: Attempt to HELLO from previously seen client\n");
handleError(curClient);
}
if(newHeader.msgID !=0) {
fprintf(stderr, "ERROR: HELLO has msgID != 0 \n");
handleError(curClient);
return;
}
if(strcmp(newHeader.destID, "Server") != 0) {
fprintf(stderr, "ERROR: HELLO not addressed to Server\n");
handleError(curClient);
return;
}
if(strcmp(newHeader.sourceID, "Server") == 0) {
fprintf(stderr, "ERROR: 'Server' is not a valid ID\n");
handleError(curClient);
return;
}
/* look for CLIENT_ALREADY_PRESENT error */
bool duplicate = false;
for(int i = 0; i < MAXCLIENTS; i++) {
if(strcmp(clients[i].ID, newHeader.sourceID) == 0) {
if(clients[i].active) {
// Can't sign in as active user
memcpy(curClient->ID, newHeader.sourceID, IDLENGTH);
handleClientPresent(curClient, newHeader.sourceID);
return;
}
// Could be client returning
duplicate = true;
}
}
if(!duplicate) {
// There is no chance of collision with existing user
curClient->validated = true;
} else {
// Need to check for correct password
curClient->validated = false;
}
curClient->totalPwordExpected = newHeader.dataLength;
curClient->pwordToRead = newHeader.dataLength;
memcpy(curClient->ID, newHeader.sourceID, IDLENGTH);
} else if(newHeader.type == LIST_REQUEST) {
/* handle LIST_REQUEST-specific bad input */
if(strcmp(curClient->ID,"") == 0) {
fprintf(stderr,"ERROR: LIST_REQUEST from client without ID\n");
handleError(curClient);
return;
}
if(newHeader.dataLength != 0) {
fprintf(stderr, "ERROR: LIST_REQUEST has dataLength != 0\n");
handleError(curClient);
return;
}
if(newHeader.msgID != 0) {
fprintf(stderr, "ERROR: LIST_REQUEST has msgID != 0\n");
handleError(curClient);
return;
}
if(strcmp(newHeader.destID, "Server") != 0) {
fprintf(stderr, "ERROR: LIST_REQEUST not addressed to Server\n");
handleError(curClient);
return;
}
handleListRequest(curClient);
} else if(newHeader.type == CHAT) {
/* handle CHAT-specific bad input (not related to CANNOT_DELIVER) */
if(newHeader.msgID == 0) {
fprintf(stderr,"ERROR: CHAT has msgID == 0\n");
handleError(curClient);
return;
}
if(strcmp(curClient->ID,"") == 0) {
fprintf(stderr,"ERROR: CHAT from client without ID\n");
handleError(curClient);
return;
}
/* store information about CHAT in clientInfo struct */
curClient->msgID = newHeader.msgID;
memcpy(curClient->destID, newHeader.destID, 20);
curClient->mode = CHAT;
curClient->dataToRead = newHeader.dataLength;
curClient->totalDataExpected = newHeader.dataLength;
} else if(newHeader.type == EXIT) {
/* No need to check for errors,
we're kicking the client out anyway! */
curClient->active = false;
numActiveClients--;
curClient->validated = false;
handleExit(curClient);
} else if(newHeader.type == PLAYER_REQUEST) {
handlePlayerRequest(curClient);
} else if(newHeader.type == DRAFT_REQUEST) {
memset(curClient->partialData, 0, MAXDATASIZE);
curClient->mode = DRAFT_REQUEST;
curClient->dataToRead = newHeader.dataLength;
curClient->totalDataExpected = newHeader.dataLength;
}else if(newHeader.type == PING_RESPONSE) {
memset(curClient->partialData,0,MAXDATASIZE);
curClient->mode = PING_RESPONSE;
curClient->msgID = newHeader.msgID;
curClient->dataToRead = newHeader.dataLength;
curClient->totalDataExpected = newHeader.dataLength;
} else if(newHeader.type == START_DRAFT) {
handleStartDraft(curClient);
} else if(newHeader.type == DRAFT_PASS) {
memset(curClient->partialData, 0, MAXDATASIZE);
curClient->mode = DRAFT_PASS;
curClient->dataToRead = newHeader.dataLength;
curClient->totalDataExpected = newHeader.dataLength;
} else {
fprintf(stderr, "ERROR: bad header type\n");
handleError(curClient);
return;
}
}
}
void readData(struct clientInfo *curClient) {
/* same logic for reading as in readHeader */
char data_buffer[curClient->totalDataExpected];
int nbytes;
memcpy(data_buffer, curClient->partialData, curClient->totalDataExpected);
nbytes = SSL_read(curClient->ssl, &data_buffer[curClient->totalDataExpected-curClient->dataToRead],curClient->dataToRead);
//fprintf(stderr, "nbytes: %d, expected readsize: %d\n",nbytes,curClient->dataToRead);
if (nbytes <= 0) {
/* Read error or EOF */
handleExit(curClient);
} else if (nbytes < curClient->dataToRead) {
/* still more data to read */
curClient->dataToRead = curClient->dataToRead - nbytes;
memcpy(curClient->partialData, data_buffer, curClient->totalDataExpected);
} else {
/* All data has been read */
memcpy(curClient->partialData, data_buffer, curClient->totalDataExpected);
//fprintf(stderr,"Message read in: curClient->partialData: %s\n",curClient->partialData);
curClient->dataToRead = 0;
if(curClient->mode == CHAT) {
handleChat(curClient);
} else if(curClient->mode == DRAFT_REQUEST) {
handleDraftRequest(curClient);
} else if(curClient->mode == PING_RESPONSE) {
handlePingResponse(curClient);
} else if(curClient->mode == DRAFT_PASS) {
handleDraftPass(curClient);
} else {
fprintf(stderr, "ERROR: Done reading data but client in invalid mode\n");
handleError(curClient);
}
}
}
void readPword(struct clientInfo *curClient) {
char data_buffer[curClient->totalPwordExpected];
int nbytes;
memcpy(data_buffer, curClient->pword, curClient->totalPwordExpected);
nbytes = SSL_read(curClient->ssl, &data_buffer[curClient->totalPwordExpected - curClient->pwordToRead], curClient->pwordToRead);
//fprintf(stderr, "nbytes: %d, expected readsize of pword: %d\n", nbytes, curClient->pwordToRead);
if (nbytes <= 0) {
/* Read error or EOF */
handleExit(curClient);
} else if (nbytes < curClient->pwordToRead) {
/* still more pword to read */
curClient->pwordToRead = curClient->pwordToRead - nbytes;
memcpy(curClient->pword, data_buffer, curClient->totalPwordExpected);
} else {
/* entire password read */
string hashed = sha256(data_buffer);
char hashBuffer[65];
for(int i = 0; i < hashed.length(); i++) {
hashBuffer[i] = hashed[i];
}
//fprintf(stderr, "Hashed pword: %s has length %d\n", hashed, hashed.length());
memcpy(curClient->pword, hashBuffer, hashed.length());
//fprintf(stderr, "Password read in: curClient->password: %s\n", curClient->pword);
curClient->pwordToRead = 0;
handleHello(curClient);
}
}
/********************************************************************
* Section 3: Handlers for specific message types *
********************************************************************/
void handleHello(struct clientInfo *curClient) {
/* Add client ID to clientInfo */
// memcpy(curClient->ID, ID, IDLENGTH);
bool returning = false;
if(curClient->validated == false) {
returning = true;
for(int i = 0; i < MAXCLIENTS; i++) {
if((strcmp(clients[i].ID, curClient->ID) == 0) && !(clients[i].sock == curClient->sock)) {
//fprintf(stderr, "In handleHello, clients[i].ID: %s with sock: %i and curClient->ID: %s with sock: %i\n",
// clients[i].ID,clients[i].sock,curClient->ID,curClient->sock);
if(strcmp(clients[i].pword, curClient->pword) == 0) {
//fprintf(stderr, "Password matches password of existing client, removing duplicate\n");
curClient->validated = true;
curClient->readyToDraft = clients[i].readyToDraft;
handleError(&clients[i]);
} else {
//fprintf(stderr, "Password does not match existing client! You're fired!\n");
handleError(curClient);
return;
}
}
}
}
char helloMessage[50];
memset(helloMessage,0,50);
if(returning) {
strcpy(helloMessage,"Welcome back ");
memcpy(helloMessage + strlen(helloMessage), curClient->ID, strlen(curClient->ID));
} else {
strcpy(helloMessage,"Welcome for the first time ");
memcpy(helloMessage + strlen(helloMessage), curClient->ID, strlen(curClient->ID));
}
helloMessage[strlen(helloMessage)] = '\0';
/* build HELLO_ACK header */
struct header responseHeader;
responseHeader.type = htons(HELLO_ACK);
strcpy(responseHeader.sourceID, "Server");
memcpy(responseHeader.destID, curClient->ID, IDLENGTH);
responseHeader.dataLength = htonl(strlen(helloMessage) + 1);
if(draftStarted && curClient->readyToDraft) {
responseHeader.msgID = htonl(1);
} else {
responseHeader.msgID = htonl(0);
}
//fprintf (stderr, "HELLO_ACK responseHeader: type: %hu, sourceID: %s, destID: %s, dataLength: %u, msgID: %u\n", responseHeader.type, responseHeader.sourceID, responseHeader.destID, responseHeader.dataLength, responseHeader.msgID);
/* send HELLO_ACK */
int bytes, sent, total;
total = HEADERSIZE; sent = 0;
fprintf(stderr, "handleHello: Writing to %s with sock %d\n", curClient->ID,curClient->sock);
do {
bytes = SSL_write(curClient->ssl, (char *)&responseHeader+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
total = strlen(helloMessage) + 1;
sent = 0;
while(sent < total) {
bytes = SSL_write(curClient->ssl, helloMessage+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+= bytes;
//fprintf(stdout,"Sent %d bytes of the helloMessage\n");
}
handleListRequest(curClient);
if(maxDelay < curClient->timeout) maxDelay = curClient->timeout;
//curClient->estRTT = 100;
//curClient->pings = 50;
//sendPing(curClient);
if(draftStarted && curClient->readyToDraft) {
struct header responseHeader;
memset(&responseHeader,0,sizeof(responseHeader));
responseHeader.type = htons(DRAFT_STARTING);
strcpy(responseHeader.destID, curClient->ID);
strcpy(responseHeader.sourceID, "Server");
responseHeader.msgID = htonl(ROUNDTIME | PARTICIPATING_MASK);
string s;
s = "Welcome back to the draft! Round "; s += to_string(theDraft.index+1); s += " is underway.\n";
char stringBuffer[s.length() + 1];
strcpy(stringBuffer, s.c_str());
stringBuffer[s.length()] = '\0';
responseHeader.dataLength = htonl(s.length() + 1);
int bytes, sent, total;
total = HEADERSIZE; sent = 0;
fprintf(stderr, "handleHello (draftStarted): Writing to %s with sock %d\n", curClient->ID,curClient->sock);
do {
bytes = SSL_write(curClient->ssl, (char *)&responseHeader+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
total = strlen(stringBuffer) + 1;
sent = 0;
while(sent < total) {
bytes = SSL_write(curClient->ssl, stringBuffer+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+= bytes;
}
}
if(draftStarted && !curClient->readyToDraft) {
struct header responseHeader;
memset(&responseHeader,0,sizeof(responseHeader));
responseHeader.type = htons(DRAFT_STARTING);
strcpy(responseHeader.destID, curClient->ID);
strcpy(responseHeader.sourceID, "Server");
responseHeader.msgID = htonl(ROUNDTIME);
string s;
s = "Round "; s += to_string(theDraft.index+1); s += " of the draft is underway. Feel free to watch the results!\n";
char stringBuffer[s.length() + 1];
strcpy(stringBuffer, s.c_str());
stringBuffer[s.length()] = '\0';
responseHeader.dataLength = htonl(s.length() + 1);
int bytes, sent, total;
total = HEADERSIZE; sent = 0;
fprintf(stderr, "handleHello (draftStarted, client not read): Writing to %s with sock %d\n", curClient->ID,curClient->sock);
do {
bytes = SSL_write(curClient->ssl, (char *)&responseHeader+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
total = strlen(stringBuffer) + 1;
sent = 0;
while(sent < total) {
bytes = SSL_write(curClient->ssl, stringBuffer+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+= bytes;
}
}
memset(&responseHeader,0,sizeof(responseHeader));
strcpy(responseHeader.sourceID, "Server");
responseHeader.msgID = htonl(0);
for(int i = 0; i < MAXCLIENTS; i++) {
if(clients[i].active && (clients[i].sock != curClient->sock)) {
strcpy(responseHeader.destID, clients[i].ID);
responseHeader.type = htons(CHAT);
string s = curClient->ID;
if(returning) {
s += " has logged back in";
} else {
s += " joined for the first time";
}
char stringBuffer[s.length() + 1];
strcpy(stringBuffer, s.c_str());
stringBuffer[s.length()] = '\0';
responseHeader.dataLength = htonl(s.length() + 1);
int bytes, sent, total;
total = HEADERSIZE; sent = 0;
fprintf(stderr, "handleHello (CHAT to active clients): Writing to %s with sock %d\n", clients[i].ID,clients[i].sock);
do {
bytes = SSL_write(clients[i].ssl, (char *)&responseHeader+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
total = strlen(stringBuffer) + 1;
sent = 0;
while(sent < total) {
bytes = SSL_write(clients[i].ssl, stringBuffer+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+= bytes;
}
handleListRequest(&clients[i]);
}
}
newEntry = true;
}
void handleListRequest(struct clientInfo *curClient) {
/* construct IDs buffer */
char IDBuffer[MAXCLIENTS * (IDLENGTH + 2)];
memset(IDBuffer, 0, (MAXCLIENTS * (IDLENGTH + 2)));
int i, bufferIndex, IDLength;
bufferIndex = 0;
/* IDs are added as long as they fit */
for(i = 0; i < MAXCLIENTS; i++) {
if(clients[i].sock != NULL) {
IDLength = strlen(clients[i].ID);
IDLength++;
//if((IDLength + bufferIndex) < MAXDATASIZE) {
strcpy(&IDBuffer[bufferIndex], clients[i].ID);
bufferIndex = bufferIndex + IDLength;
if(!(clients[i].active)) {
IDBuffer[bufferIndex-1] = '*';
IDBuffer[bufferIndex] = ' ';
bufferIndex++;
}
//}
}
}
//IDBuffer[bufferIndex] = '\0';
//bufferIndex++;
/* build CLIENT_LIST header */
struct header responseHeader;
responseHeader.type = htons(CLIENT_LIST);
strcpy(responseHeader.sourceID, "Server");
strcpy(responseHeader.destID, curClient->ID);
responseHeader.dataLength = htonl(bufferIndex);
responseHeader.msgID = htonl(0);
//fprintf (stderr, "CLIENT_LIST responseHeader: type: %hu, sourceID: %s, destID: %s, dataLength: %u, msgID: %u\n", responseHeader.type, responseHeader.sourceID, responseHeader.destID, responseHeader.dataLength, responseHeader.msgID);
/* send CLIENT_LIST header */
int bytes, sent, total;
total = HEADERSIZE; sent = 0;
fprintf(stderr, "handleListRequest: Writing to %s with sock %d\n", curClient->ID,curClient->sock);
do {
bytes = SSL_write(curClient->ssl, (char *)&responseHeader+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
/* send IDBuffer */
total = bufferIndex; sent = 0;
do {
bytes = SSL_write(curClient->ssl, (char *)&IDBuffer+sent, total-sent);
if(bytes < 0) error("ERROR writing to socket");
if(bytes == 0) break;
sent+=bytes;
} while (sent < total);
}
void handleChat(struct clientInfo *sender) {
int i; int badRecipient = 1;
struct clientInfo *receiver = 0;
/* find the recipient and make sure they are valid */
for(i = 0; i < MAXCLIENTS; i++) {
if((strcmp(clients[i].ID, sender->destID) == 0) && clients[i].active) {
if((strcmp(sender->destID, sender->ID) != 0) && (strcmp(sender->destID,"") != 0)) {
receiver = &clients[i];
badRecipient = 0;
}
}
}
if(badRecipient == 1) {
handleCannotDeliver(sender);
return;
}
//sendPing(receiver);