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server.c
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server.c
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#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<fcntl.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<string.h>
#include<ctype.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#include<errno.h>
#include<strings.h>
#include<signal.h>
#include<sys/ioctl.h>
#include<pthread.h>
#include <arpa/inet.h>
#include <poll.h>
#include<time.h>
#define TRUE 1
#define START "Welcome : Enter the commands to your liking\n"
#define DIVIDE "Error : division by zero\n"
#define MESSAGE "Invalid command, type help\n"
#define NOELEMENTS "No elements in the list\n"
#define HELP "=========================\nWelcome to our program guide:\nType add number1 number2 ...\nType sub number1 number2 ...\nType mult number1 number2 ...\nType div number1 number2 ...\nType run argument1 ...\nType list : To view currenly running processes and list[ all] for all processes executed\nType kill PID, to kill an actively running prcocess\nType exit : to exit our program\nNote: All the operations are not case-sensitve, example: Add, aDD, ADd are valid\nMinimun number of inputs for arthimetic operation is Two\n=========================\n"
//##Structure defintions
struct showIpAndPortNode{
int pid;
int socket;
int readServerChildId;
int writeServerChildId;
int readServerId;
int writeServerId;
int portNo;
char ipAddress[INET_ADDRSTRLEN];
};//client information node
struct ipAndPortArrayNode{
int connectionNo;
struct showIpAndPortNode *ipAndPortArray[30];
}; //client list array
struct ipAndPortArrayNode clientList;
//array of clients defined globally
struct acceptConnectionsNode{
int identifier;
struct sockaddr_in clientAddr;
int lengthClient;
};
//structure passed into accept connection thread;
struct Node{
int id;
int active;
time_t start;
time_t end;
char name[15];
};
//individual process node
struct Node * processArray[30];
//Node array defined
int processCounter = 0;
//process counter for process array
//###method definition#########
void printProcessArray(int fd);
//printing the aray
void printActiveProcessArray(int fd);
//printing the active array
void removeProcess(int processID);
//changing status to inactive
void printProcessIp(struct showIpAndPortNode * pipeInput);
//printing server port and ip on the screen
void printClientProcess(struct showIpAndPortNode * pipeInput);
//printing client processes on the screen; command given by the server
int checkDigit(char * token);
//checking if arguments for the arthimentics are valid or not
char* methodArithmetic(char * token, char * buff);
//method to handle arthimetic
void * acceptConnections(void * ptr);
//thread for accepting connection
int getIndexClient(int pid);
//this method is called by the child server method of locating the child in array with the help of pid
void removeProcessClient(int pid);
//this process removes the child from parent server list once the child has disconnected
void * serverRead(void *ptr);
//thread for parent process read
void printClients();
//server process method to get the list o
void saveEndTime(int pid, time_t end);
void * serverChildRead(void *ptr);
//thread for server Child
static void signalHandler()
{
int status;
int pid;
do{
pid = waitpid(-1,&status,WNOHANG);
if(pid == -1)
{
perror("error");
exit(1);
}
if(pid > 0)
{ time_t timeNoted = time(NULL);
saveEndTime(pid,timeNoted);
removeProcess(pid); //changing the status of the process to inactive...
}
}while(pid == 0);
}
//signal handler for server child to remove make its processes appear inactive
static void signalHandlerClient()
{
int pid = wait(NULL);
removeProcessClient(pid);
}
//signal handler for server parent to remove client from its client list
void printIpAndPort(int portNumber, char * ipAddress)
{
int port = ntohs(portNumber);
char tempBuff[100];
int count = sprintf(tempBuff,"Port number = %d and ip = %s\n", port,ipAddress);
write(STDOUT_FILENO,tempBuff,count);
}
void killProcessByName(char * token, int fd)
{
if(strcasecmp(token,"all") == 0)
{
int activePCount;
for(int i = 0;i<processCounter;i++)
{
if(processArray[i]->active == 1)
{
activePCount++;
int c = kill(processArray[i]->id,SIGTERM);
if(c == -1)
perror("error");
}
}
if(activePCount == 0)
write(fd,"No active process to terminate\n",strlen("No active process to terminate\n"));
else write(fd,"All active processes terminated\n",strlen("All active processes terminated\n"));
}
else{
int returnID;
for(int i = 0; i<processCounter; i++)
{
if(strcmp(processArray[i]->name, token) == 0 && processArray[i]->active == 1)
{
returnID = i;
break;
}
}
int c = kill(processArray[returnID]->id,SIGTERM);
if(c == 0 && returnID != 0)
{
char buff[100];
int count = sprintf(buff,"Prcocess %s, pid %d terminated\n",processArray[returnID]->name,processArray[returnID]->id);
write(fd,buff,count);
}
else write(fd,"Process has already terminated or is not in the list\n",strlen("Process has already terminated or is not in the list\n"));
}
}
//killing process by name
char* methodArithmetic(char * token, char * buff)
{
char * identifier = token;
int sum = 0;
int firstNumber = 0;
int divideZero = 0;
int check = 0;
int arguments = 0;
if((token = strtok(NULL," \n")) == NULL)
{
strcpy(buff,MESSAGE);
return buff;
}
while(token != NULL)
{
check = checkDigit(token);
if(check == 0)
break;
if(strcasecmp("add",identifier) == 0)
{
sum += atoi(token);
}
else if(strcasecmp("sub",identifier) == 0)
{
if(firstNumber == 0)
{
sum = atoi(token);
firstNumber = 1;
}
else sum -= atoi(token);
}
else if(strcasecmp("mult",identifier) == 0)
{
if(firstNumber == 0)
{
sum = atoi(token);
firstNumber = 1;
}
else sum *= atoi(token);
}
else if(strcasecmp("div",identifier) == 0)
{
if(firstNumber == 0)
{
sum = atoi(token);
firstNumber = 1;
}
else
{
if( atoi(token) == 0)
{
divideZero = 1;
break;
}
sum = sum / atoi(token);
}
}
arguments++;
token = strtok(NULL," \n");
}
if(check == 0)
strcpy(buff,"Invalid arguments\n");
else if(divideZero == 1)
strcpy(buff,DIVIDE);
else if ( arguments == 1)
strcpy(buff,"Too few arguments! Atleast two required\n");
else
{ int count = sprintf(buff,"result of %s : %d",identifier,sum);
buff[count] = '\n';
count++;
buff[count] = '\0';
}
return buff;
}
//check digit for finding any character other than numbers
int checkDigit(char * token)
{
int i = 0;
char buff[20];
strcpy(buff, token);
int c = 0;
while(i < strlen(token))
{
c = isdigit(buff[i]);
if(c == 0)
break;
i++;
}
if(c == 0)
return 0;
else return 1;
}
//recording end time
void saveEndTime(int pid, time_t end)
{
for(int i = 0;i<processCounter;i++)
{
if(processArray[i]->id == pid)
{
processArray[i]->end = end;
break;
}
}
}
void printArray(int fd)
{
int i = 0;
char buff[2000];
int count = 0;
struct tm * time_sec;
struct tm * time_secE;
count += sprintf(&buff[count],"[ Process ID ] [ Active ] [ start time ] [ End time ] [ Elapsed time ] [ Process name ]\n");
for(;i<processCounter;i++)
{
time_sec = localtime(&(processArray[i]->start));
int hrS = time_sec->tm_hour;
int mmS = time_sec->tm_min;
int ssS = time_sec->tm_sec;
int hrE = 0;
int mmE = 0;
int ssE = 0;
if(processArray[i] -> end != -1)
{
time_secE = localtime(&(processArray[i]->end));
hrE = time_sec->tm_hour;
mmE = time_sec->tm_min;
ssE = time_sec->tm_sec;
}
count += sprintf(&buff[count]," %d : %d :%u:%u:%u : %u:%u:%u : %d :: %s :\n",processArray[i]-> id,processArray[i]->active,hrS,mmS,ssS,hrE,mmE,ssE,(int)time(NULL) - (int)processArray[i]->start,processArray[i]->name);
}
write(fd,buff,count);
}
void printActiveArray(int fd)
{
int i = 0;
int count=0;
int activeProcesses = 0;
char buff[1000];
struct tm * time_sec;
struct tm * time_secE;
count += sprintf(&buff[count],"[ Process ID ][ start time ][ Elapsed time ][ Process name ]\n");
for(;i<processCounter;i++)
{
if(processArray[i]->active == 1)
{
time_sec = localtime(&(processArray[i]->start));
int hrS = time_sec->tm_hour;
int mmS = time_sec->tm_min;
int ssS = time_sec->tm_sec;
count += sprintf(&buff[count],"%d %u:%u:%u %d %s\n ",processArray[i]->id,hrS,mmS,ssS,(int)time(NULL) - (int)processArray[i]->start,processArray[i]->name);
activeProcesses++;
}
buff[count] = '\0';
count++;
}
if( activeProcesses > 0)
write(fd,buff,count);
else write(fd,"Currently no active processes listed\n",strlen("Currently no active processes listed\n"));
}
//remove active array
void removeProcess(int pid)
{
int i;
for(i = 0; i<processCounter;i++)
{
if(processArray[i]->id == pid)
{
processArray[i]->active = 0;
break;
}
}
}
//struct serverParentChildNode pipeVariable;
//#######Server###############
int main()
{
int sock, length;
struct sockaddr_in server, client;
int writeCountSocket = 0;
int readCountSocket = 0;
char * runArray[20];
int moreThanOneThreads = 0;//to ensure only one server read thread is connected
if(signal(SIGCHLD, signalHandlerClient) == SIG_ERR)
{
perror("error binding handling SIGCHLD");
}
/*Create Sockets*/
sock = socket(AF_INET, SOCK_STREAM, 0);
if( sock < 0)
{
perror("error: making socket");
exit(1);
}
/*server wildcard entries*/
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = 0;
if(bind(sock,(struct sockaddr *) &server, sizeof(server)) < 0)
{
perror("error");
exit(1);
}
length = sizeof(server);
if(getsockname(sock,(struct sockaddr *) &server,(socklen_t *) &length) < 0)
{
perror("error");
exit(1);
}
char str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, (void *)&server.sin_addr.s_addr, str,INET_ADDRSTRLEN);
printIpAndPort(server.sin_port,str);//print port number on the server screen
/* listening for connections*/
listen(sock, 5);
//detach thread attributes
pthread_t readThread;
pthread_attr_t myattr;
pthread_attr_init(&myattr);
pthread_attr_setdetachstate(&myattr , PTHREAD_CREATE_DETACHED);
//user control of server
do{
pthread_t connectThread;//connection accepting thread
int clientLength = sizeof(client);
//connector Node setting which will be passed to connectThread
struct acceptConnectionsNode connector;
connector.identifier = sock;
connector.clientAddr = client;
connector.lengthClient = clientLength;
struct showIpAndPortNode *clientInformation;
//thread creation
int iret1 = pthread_create(&connectThread, NULL ,acceptConnections,(void *)&connector);
//waiting for the thread
void *readMessage;
//waiting for the thread
pthread_join(connectThread, &readMessage);
//storing the information in clientlist node
clientInformation = (struct showIpAndPortNode *)readMessage;
int msgsock = clientInformation->socket;
clientList.ipAndPortArray[clientList.connectionNo] = clientInformation;
clientList.connectionNo++;
//creating pipes between server thread of parent and the child server thread
int pipeDescriptors[2];
int pipeDescriptorsOne[2];
pipe(pipeDescriptors);
pipe(pipeDescriptorsOne);
//saving pipes id in clientlist node, so that they are available to both server parent and child thread
clientInformation->writeServerId = pipeDescriptors[1];
clientInformation->readServerId = pipeDescriptorsOne[0];
clientInformation->readServerChildId = pipeDescriptors[0];
clientInformation->writeServerChildId = pipeDescriptorsOne[1];
//one time thread creation for the parent server
int iret2;
if(moreThanOneThreads == 0)
{
iret2 = pthread_create(&readThread, &myattr ,serverRead,NULL);
moreThanOneThreads = 1;
}
int serverChild = fork();
if(serverChild == 0)
{
close(pipeDescriptors[1]);
close(pipeDescriptorsOne[0]);
pthread_t serverChildThread;
/*Implementing SIGCHLD handling in signalhandler*/
if(signal(SIGCHLD, signalHandler) == SIG_ERR)
{
perror("error binding handling SIGCHLD");
}
//creation of thread for child server
int iret3 = pthread_create(&serverChildThread, &myattr ,serverChildRead,(void *)clientInformation);
do{
char readBuffSocket[100];
bzero(readBuffSocket,100);
int status = 1;
writeCountSocket = 0;
readCountSocket = 0;
int bufferOverFlow = 0;
char readBuff;
while(status != 0)
{
int readFromSocket = read(msgsock,&readBuff,1);
if(readFromSocket == 0)
break;
readBuffSocket[readCountSocket] = readBuff;
if(status > 100) //note: not the best way to handle buffer overflow error but gets the job done in my case
{
bufferOverFlow = 1;
break;
}
readCountSocket++;
ioctl(msgsock,FIONREAD, &status);
}
char * arthimeticBuff = (char *)malloc(200*sizeof(char));
int argumentRunArray = 0;//for run arguments counter
char * resultBuff;//for arthimetic operations
int ignore = 0;//for run method, an ignore check
if(readCountSocket == 0)//client disconnected for some reasons
{
write(STDOUT_FILENO, "Connection ended\n",strlen("Connection ended\n"));
killProcessByName("all", STDOUT_FILENO);//i have used the same method for killing by name (all)
exit(EXIT_SUCCESS);
}
char * token;
if(readCountSocket - 1 == 0 || bufferOverFlow == 1)
token = "a"; //garbase value so that no if else conditions becomes true
else token = strtok(readBuffSocket," \n");
//case comparing
if(strcasecmp("add",token) == 0)
{
char * resultBuff = methodArithmetic(token, arthimeticBuff);
writeCountSocket = write(msgsock, resultBuff, strlen(arthimeticBuff));
}
else if(strcasecmp("sub",token) == 0)
{
resultBuff = methodArithmetic(token, arthimeticBuff);
writeCountSocket = write(msgsock, resultBuff, strlen(arthimeticBuff));
}
else if(strcasecmp("mult",token) == 0)
{
resultBuff = methodArithmetic(token, arthimeticBuff);
writeCountSocket = write(msgsock, resultBuff, strlen(arthimeticBuff));
}
else if(strcasecmp("div",token) == 0)
{
resultBuff = methodArithmetic(token, arthimeticBuff);
writeCountSocket = write(msgsock, resultBuff, strlen(arthimeticBuff));
}
else if(strcasecmp("run",token) == 0)
{
if((token = strtok(NULL," \n")) == NULL)
write(msgsock,MESSAGE,strlen(MESSAGE));
else{
int i = 0;
while(token != NULL)
{
if( i == 0)
{
runArray[i] = (char *)malloc(30*sizeof(char));//filling the arguments for exec
strcpy(runArray[i],token);
i++;
}
runArray[i] = (char *)malloc(30*sizeof(char));
strcpy(runArray[i],token);
i++;
token = strtok(NULL, " \n");
}
runArray[i] = NULL;
argumentRunArray = i;
ignore = 1;
}
}
//listing processes
else if(strcasecmp("list",token) == 0)
{
if(processCounter > 0)
{
token = strtok(NULL," \n");
if(token == NULL)
printActiveArray(msgsock);
else if(strcmp(token,"all") == 0)
{
if((token = strtok(NULL," \n")) == NULL)
printArray(msgsock);
else write(msgsock,"Invalid command\n",strlen("Invalid command\n"));
}
else write(msgsock,"Invalid command\n",strlen("Invalid command\n"));
}
else write(msgsock,"List is currently Empty\n",strlen("List is currently Empty\n"));
}
else if(strcasecmp("kill",token) == 0)
{
if(processCounter > 0)
{ token = strtok(NULL," \n");
if(token==NULL)
{
write(msgsock,"Invalid command\n",strlen("Invalid command\n"));
}
else {
char * stoken = token;
token = strtok(NULL," \n");
if(token == NULL)
{
int pid = 0;
int kcount = sscanf(stoken,"%d",&pid);
int check = checkDigit(stoken);
if(check == 0)
{
killProcessByName(stoken, msgsock);
}
else {
kcount = kill(pid,SIGTERM);
if(kcount == -1)
write(msgsock,"Invalid process ID\n",strlen("Invalid process ID\n"));
else write(msgsock,"Process Terminated\n",strlen("Process Terminated\n"));
}
}
else write(msgsock,"Invalid arguments\n",strlen("Invalid arguments\n"));
}
}
else write(msgsock,"No processes listed\n",strlen("No processes listed\n"));
}
else if(strcasecmp("help",token) == 0)
{
token = strtok(NULL," \n");
if(token == NULL)
write(msgsock,HELP,strlen(HELP));
else write(msgsock,MESSAGE,strlen(MESSAGE));
}
else if(strcasecmp("disconnect",token) == 0)
{
token = strtok(NULL," \n");
if(token == NULL)
{ killProcessByName("all", STDOUT_FILENO);
write(msgsock,"Connection disconnected\n",strlen("Connection Disconnected\n"));
exit(EXIT_SUCCESS);//test
}
else write(msgsock,MESSAGE,strlen(MESSAGE));
}
else if(strcasecmp("exit",token) == 0)
{
token = strtok(NULL," \n");
if(token == NULL)
{ write(msgsock,"Connection terminated\n",strlen("Connection terminated\n"));
write(STDOUT_FILENO,"Exited\n",strlen("Exited\n"));
killProcessByName("all", STDOUT_FILENO);
exit(EXIT_SUCCESS);//test
}
else write(msgsock,MESSAGE,strlen(MESSAGE));
}
else{
if(bufferOverFlow == 1)
{
char dumpBuffer[1000];
read(msgsock,dumpBuffer,1000); //if bufferOverFlow is true, then to dump rest of the data from the socket empty, a dumpBuffer is user so that socket becomes empty
writeCountSocket = write(msgsock, "Buffer overflow!\n", strlen("Buffer overflow!\n"));
}
else writeCountSocket = write(msgsock, "Invalid command\n", strlen("Invalid command\n"));
}
//###Running processes on the server#####
if(ignore == 1)//ignore check becomes true when a run command is given
{
int status;
int sd[2];
int serverPipe = pipe(sd);
if(serverPipe == -1 )
{
perror("error");
}
fcntl(sd[1],F_SETFD,FD_CLOEXEC);//pipe closing on exec
int serverPid = fork();
if(serverPid == -1)
perror("error");
if(serverPid == 0)
{
int count = execvp(runArray[0],&runArray[1]);
if(count == -1)
{
close(sd[0]);
perror("error");
write(sd[1],"salman",6);//some random character to make condition in child false
close(sd[1]);
exit(1);
}
}
else if(serverPid > 0)
{
int waitChild = waitpid(serverPid, &status,WNOHANG);
close(sd[1]);
char writingbuff[50];
int count = read(sd[0],writingbuff,50);
if(count == 0)
{
//filling the process array
processArray[processCounter] = (struct Node *)(malloc(50*sizeof(struct Node)));
processArray[processCounter] -> id = serverPid;
strcpy(processArray[processCounter] -> name, runArray[0]);
processArray[processCounter] -> active = 1;
processArray[processCounter] -> start = time(NULL);
processArray[processCounter] -> end = -1;
processCounter++;
write(msgsock,"Executing...\n",strlen("Executing...\n"));
}
else
{
write(msgsock,"Invalid program execution\n",strlen("Invalid program execution\n"));
}
close(sd[0]);
}
}
for(int j = 0 ;j<argumentRunArray; j++)
free(runArray[j]);//freeing the memory
free(arthimeticBuff);
resultBuff = NULL;
token = NULL;
//client and child server communication###########
}while(readCountSocket != 0);
close(msgsock);//closing the socket after the disconnet or exit
}
else if(serverChild > 0)
{
clientInformation->pid = serverChild;//storing the pid in clientList node
close(pipeDescriptors[0]);
close(pipeDescriptorsOne[1]);
}
}while(TRUE);
}
//thread 1
//It accepts information and stores some in clientList node. And passes that to return value in pthread_join
void * acceptConnections(void * ptr)
{
int * sock = (int *)ptr;
struct acceptConnectionsNode *acceptConnector;
struct showIpAndPortNode *clientInformation = (struct showIpAndPortNode*)malloc(sizeof(struct showIpAndPortNode));
//struct returnFromAccept *returnPortAndSocket = (struct returnFromAccept *)malloc(sizeof(struct returnFromAccept));
acceptConnector = (struct acceptConnectionsNode *) ptr;
int returnValue = accept(acceptConnector->identifier,(struct sockaddr *)&acceptConnector->clientAddr, &acceptConnector->lengthClient);
if(returnValue == -1)
{
pthread_exit(NULL);
}
else {*sock = returnValue;
char str[INET_ADDRSTRLEN];
inet_ntop(AF_INET, (void *)&acceptConnector->clientAddr.sin_addr.s_addr, str,INET_ADDRSTRLEN);
clientInformation->socket = returnValue;
clientInformation->portNo = ntohs(acceptConnector->clientAddr.sin_port);
strcpy(clientInformation->ipAddress,str);
write(clientInformation->socket,"Welcome to the server developed by saad486::\n",strlen("Welcome to the server developed by saad486::\n"));
pthread_exit((void *)clientInformation);//return struct
}
}
//server Read thread which makes server parent interactivr
/*
some basic commands it can respond to\
-list processes
-list client
-list processes IP
-say ---- //write anything after say followed by space; it will be broadcasted to every client
*/
void * serverRead(void *ptr)
{
while(1)
{
char readBuff[100];
bzero(readBuff,100);
write(STDOUT_FILENO,"Enter the command:\n",strlen("Enter the command:\n"));
int readCount = read(STDIN_FILENO,readBuff,100);
char * token = strtok(readBuff," ");
char result[1000];
int count;
if(token == NULL)
token = "a";//garbage
if(strcasecmp(token,"list") == 0)
{
token = strtok(NULL," \n");
if(token == NULL)
{
write(STDOUT_FILENO,"Invalid command\n",strlen("Invalid command\n"));
}
else if(strcasecmp(token,"processes") == 0)
{
if(clientList.connectionNo == 0)
write(STDOUT_FILENO,"No clients processes listed\n",strlen("No clients processes listed\n"));
else if((token = strtok(NULL," \n")) != NULL)
{
if(strcasecmp(token,"IP") == 0)
{
for(int i = 0; i < clientList.connectionNo;i++)
{ int readCount = write(clientList.ipAndPortArray[i]->writeServerId,"Give IP\n",strlen("Give IP\n"));
count = read(clientList.ipAndPortArray[i]->readServerId,result,1000);