Hello,Ther is some problem in you codeI made my own programme as.pdf

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Hello, Ther is some problem in you code I made my own programme as per your requirement Please check my solution :- 1)Create one FIFO 2)From Client write character first and wait for some time so that server will read it 3) After wait for some time write integer Server programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = \"/tmp/client_to_server_fifo\"; char str; int iteration; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* open, read, and display the message from the FIFO */ client_to_server = open(myfifo, O_RDONLY); printf(\"Server ON.\ \"); read(client_to_server, &str, sizeof(str)); read(client_to_server, &iteration, sizeof(iteration)); close(client_to_server); unlink(myfifo); //Now Print the character for(int i = 0; i < iteration ; i++){ printf(\"Iteration ::%d and Character:: %c\ \",i,str); } return 0; } Client Programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = \"/tmp/client_to_server_fifo\"; char str; int iteration; printf(\"Client: Please enter a character: \"); scanf(\"%c\", &str); printf(\"Client: Please enter an integer: \"); scanf(\"%d\", &iteration); /* write str to the FIFO */ client_to_server = open(myfifo, O_WRONLY); //First write character write(client_to_server, &str, sizeof(str)); //wait for some time so that server will read character sleep(0.250); //Then write integer write(client_to_server, &iteration, sizeof(iteration)); perror(\"Write:\"); //Very crude error check printf(\"...received from the server: %s\ \",str); close(client_to_server); /* remove the FIFO */ return 0; } Solution Hello, Ther is some problem in you code I made my own programme as per your requirement Please check my solution :- 1)Create one FIFO 2)From Client write character first and wait for some time so that server will read it 3) After wait for some time write integer Server programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = \"/tmp/client_to_server_fifo\"; char str; int iteration; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* open, read, and display the message from the FIFO */ client_to_server = open(myfifo, O_RDONLY); printf(\"Server ON.\ \"); read(client_to_server, &str, sizeof(str)); read(client_to_server, &iteration, sizeof(iteration)); close(client_to_server); unlink(myfifo); //Now Print the character for(int i = 0; i < iteration ; i++){ printf(\"Iteration ::%d and Character:: %c\ \",i,str); } return 0; } Client Programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = \"/tmp/client_to_server_fifo\"; char str; int iteration; printf(\"Client: Please enter a character: \"); scanf(\"%c\", &str); printf(\"Client: Please enter an integer: \"); scanf(\.

Education

$Hello, Ther is some problem in you code I made my own programme as per your requirement Please check my solution :- 1)Create one FIFO 2)From Client write character first and wait for some time so that server will read it 3) After wait for some time write integer Server programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = "/tmp/client_to_server_fifo"; char str; int iteration; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* open, read, and display the message from the FIFO */ client_to_server = open(myfifo, O_RDONLY); printf("Server ON. "); read(client_to_server, &str, sizeof(str)); read(client_to_server, &iteration, sizeof(iteration)); close(client_to_server); unlink(myfifo); //Now Print the character for(int i = 0; i < iteration ; i++){ printf("Iteration ::%d and Character:: %c ",i,str); }$

$return 0; } Client Programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = "/tmp/client_to_server_fifo"; char str; int iteration; printf("Client: Please enter a character: "); scanf("%c", &str); printf("Client: Please enter an integer: "); scanf("%d", &iteration); /* write str to the FIFO */ client_to_server = open(myfifo, O_WRONLY); //First write character write(client_to_server, &str, sizeof(str)); //wait for some time so that server will read character sleep(0.250); //Then write integer write(client_to_server, &iteration, sizeof(iteration)); perror("Write:"); //Very crude error check printf("...received from the server: %s ",str); close(client_to_server); /* remove the FIFO */ return 0; }$

$Solution Hello, Ther is some problem in you code I made my own programme as per your requirement Please check my solution :- 1)Create one FIFO 2)From Client write character first and wait for some time so that server will read it 3) After wait for some time write integer Server programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = "/tmp/client_to_server_fifo"; char str; int iteration; /* create the FIFO (named pipe) */ mkfifo(myfifo, 0666); /* open, read, and display the message from the FIFO */ client_to_server = open(myfifo, O_RDONLY); printf("Server ON. "); read(client_to_server, &str, sizeof(str)); read(client_to_server, &iteration, sizeof(iteration)); close(client_to_server); unlink(myfifo); //Now Print the character for(int i = 0; i < iteration ; i++){$

$printf("Iteration ::%d and Character:: %c ",i,str); } return 0; } Client Programme :- --------------------------------------- #include #include #include #include #include int main() { int client_to_server; char *myfifo = "/tmp/client_to_server_fifo"; char str; int iteration; printf("Client: Please enter a character: "); scanf("%c", &str); printf("Client: Please enter an integer: "); scanf("%d", &iteration); /* write str to the FIFO */ client_to_server = open(myfifo, O_WRONLY); //First write character write(client_to_server, &str, sizeof(str)); //wait for some time so that server will read character sleep(0.250); //Then write integer write(client_to_server, &iteration, sizeof(iteration)); perror("Write:"); //Very crude error check printf("...received from the server: %s ",str); close(client_to_server); /* remove the FIFO */$

Please help with the below 3 questions, the python script is at the bottom, I cannot get it to work correctly please indicate where the error is. Thanks Question-01: Approximately how much longer does it take to do a round-trip ping from/to a remote machine than from/to localhost? (Note, answers may vary if you are doing the experiment from your home or from the CS building itself and whether the destination is in North America or some other continent). Question-02: Currently, the program calculates the round-trip time for each packet and prints it out individually. Modify this to correspond to the way the standard ping program works. You will need to report the minimum, maximum, and average RTTs at the end of all pings from the client. In addition, calculate the packet loss rate (in percentage). Question-03: Your program can only detect timeouts in receiving ICMP echo responses. Modify the Pinger program to parse the ICMP response error codes and display the corresponding error results to the user. Examples of ICMP response error codes are 0: Destination Network Unreachable, 1: Destination Host Unreachable. In this lab, you will gain a better understanding of Internet Control Message Protocol (ICMP). You will learn to implement a Ping application using ICMP request and reply messages. Ping is a computer network application used to test whether a particular host is reachable across an IP network. It is also used to self-test the network interface card of the computer or as a latency test. It works by sending ICMP echo reply packets to the target host and listening for ICMP echo reply replies. The "echo reply" is sometimes called a pong. Ping measures the round-trip time, records packet loss, and prints a statistical summary of the echo reply packets received (the minimum, maximum, and the mean of the round-trip times and in some versions the standard deviation of the mean). Your task is to develop your own Ping application in Python. Your application will use ICMP but, in order to keep it simple, will not exactly follow the official specification in RFC 1739. Note that you will only need to write the client side of the program, as the functionality needed on the server side is built into almost all operating systems. You should complete the Ping application so that it sends ping requests to a specified host separated by approximately one second. Each message contains a payload of data that includes a timestamp. After sending each packet, the application waits up to one second to receive a reply. If one second goes by without a reply from the server, then the client assumes that either the ping packet or the pong packet was lost in the network (or that the server is down). This lab requires you to compose new python code. A skeleton framework is given, you will need to fill in the blanks. This lab will require you to build and/or decode a packed binary array of data that is specified by the ICMP protocol. To assist you, the ICMP protocol speci.

In C programming please CSCI 4534 Operating Systems Program.pdf

ankitsrivastava681882

In C programming please. CSCI 4534 Operating Systems Programming Assignment #2 Date Due: Monday, Mar 13th, 2023 @ 11:59pm submitted to Blackboard This assignment is meant to: 1. Introduce students to writing basic client/server programs in C using the UNIX/Linux platform 2. Provide an opportunity to write code that will become the base for projects similar to that of a simulated operating system component 3. Extend the server to be able to handle requests from multiple clients simultaneously. Objective: Create programs that run independently and can perform simple IPC using FIFOs/named pipes to pass information back and forth in a client/server fashion. This assignment requires the analysis, implementation, testing and documentation of two small programs written in C on the UHCL Linux server ruby or your own Linux box or virtual machine. A server program and a client program that will be run concurrently. Server program: There is no change in the functionality of the server program (as far as the convert&store) other than: 1. Make the server keep a simulated processID counter initialized to 1, increment and return the simulated processID value to each client that initiates a connection with the server. (Clients will need to save their simulated PID to include with each simulated system call made and sent to the server afterwards). 2. Save the file descriptors for the return fifo for each client in an array/list so that when a request comes in from client X, a proper reply is sent to client X through its own return fifo. The server program will provide a simple convert&store service to clients that connect with it and send it requests. Server program will be an iterative server (can process ONLY one client at a time) and it needs to do the following: Create a well-known receive FIFOs where it will read its input/requests from the client and open it in READ mode (will block of course until a client opens the same fifo in write mode). Then go into an infinite loop to read requests from the clients, each request will be a simulated system call, each request/system call should include: 1. Process ID of process sending/making the system call 2. System call number (integer or byte) 3. Number n of parameters in the system call (integer or byte) 4. Size of the rest of the message that includes 5. Actual value(s) for the n parameters indicated in 3 As described below: System Call 1 would be the first request sent by a new client (connect system call) 1. Process ID 2. System Call Number = 1 3. Number n of parameters = 1 4. Size of 5 5. Actual value(s) for the 1 parameter = the name of the clients specific FIFO which the server should use to reply to that client. Server should open that client-specific FIFO in WRITE mode, save the file descriptor and the pid of the client for use when replies need to be sent to that client. 6. No need to return anything. Increment the processID counter and return the next available simulated ClientID/processID System Cal.

Choose one of these three options A IPC using FIFO B Shar.pdf

aghsports

Choose one of these three options: A. IPC using FIFO B. Shared memory C. Sockets and Client- Server In this lab, you will be required to write two C routines which talk to each other through a communications channel. You can Choose to either implement the code using FIFOs, a shared memory segment or through the use of sockets. In the description below these will be referred to generically as "the communications channel" or just "the channel". The objective is to create a client-server environment to copy the contents of a file from the client to the server. This will mimic a file UPLOAD process. Your client code will run as a single process on the computer. Your server code must also be run as a separate process on the same computer. This means having two terminal windows running. One for the server, one for the client. No fork() or exec() calls are to be used for this lab. The filename should be supplied to the client as a command line parameter. Your client code, once connected, should send a message to the server. The message should contain a filename. The server should then receive the filename and prepare to receive data. The client should open the file and copy it through the channel to the server. You must only use read() and write() to transfer data through the socket. Each "packet" of information sent must use a structure that contains both the number of bytes being transferred as well as the data stream. Something akin to: struct student_record { int nbytes; char payload[1024]; }; The server code should then accept the data buffer through the channel and writes the identified number of bytes to the local filename. The data exchange should happen in fixed block sizes, say 1024 bytes. When the client sends a packet to the server containing fewer than the expected packet size, your code can assume the client has hit the end of file. You should expect the test files I will use will be of arbitrary length. Some will be smaller, some much larger than 1024 bytes. Restrictions: When you are retrieving data from the source file, you must use open() and read(). You are not allowed to use fopen() as it will not read binary files properly. You are not allowed to use the sendfile() system call or any other bulk transfer utilities. Depending on the approach you have chosen, you are required to read()/write() or send()/recv() the data and then push it through the channel you created. Both the server and client should close their copy of the file. The client should then send a disconnect message to the server and exit. Your destination filename should be something like: lab6_sourcefile_local_clone. A) IPC using FIFO Your client code should use two FIFOs. One for client-to-server transfers and one for server-to-client messages. You are allowed to assume that these FIFOs have static well known names and that only one client will ever be talking to the server at a time. The client must check for the presence of both FIFOs before it accepts user input..

Rpc mechanismvaishali_singh

Running Head IMPLEMENTING THE LIST AND SEARCH FEATURES IN THE DIS.docx

cowinhelen

Running Head: IMPLEMENTING THE LIST AND SEARCH FEATURES IN THE DISTRIBUTED LIBRARY APPLICATION IMPLEMENTING THE LIST AND SEARCH FEATURES IN THE DISTRIBUTED LIBRARY APPLICATION 11 Implementing the List and Search Features In the Distributed Library Application Name of Student Name of Institution Date of submission Implementing the List and Search Features In the Distributed Library Application Abstract In the world of programming, Perl and C are the common set of computer programs used to execute computer commands. Perl scripts are so popular, particularly for programs that manages huge quantities of text like the indexers. Perl scripts are very easy and at times can be very difficult subject to the intended use. A good example is that they can be developed to perform particular tasks like deleting or renaming of files. In the Implementing the List and Search Features in the Distributed Library Application, a client can be used to run distributed library application at the library for the purpose of serving books. Once installed and running, upon waiting for requests from peers concerning books requested for the client, the program writes a sequence of codes that are necessary for performing the required steps The below are the modifications that are vital at the client end; Client script; #!/usr/bin/Perl use IO::Socket::INET; $socket = new IO::Socket::INET ( PeerHost => '122.0.0.1', PeerPort => '30000', Proto => 'tcp', ) or die "Oops : $!\n"; print "Waiting for requests.\n"; #Port number, login ID and password. $serverinfo = <$socket>; print " Port number ,login ID and password: $serverinfo \n"; # Login ID and password information. $clientinfo = "... Ok, this is client speaking ..."; print $socket "$clientdata \n"; $socket->terminate{}; On registration, #!/usr/bin/Perl open {REGISTRATION, "registration"} die "Can't open registration: $!\n"; · while {$line = <login ID, password, and port number(3302)>} [ {$menu, $registration} = split{/ /, $line}; $registration[$menu ] .= $registration. " "; ] Server script; #!/usr/bin/perl use IO::Socket::INET; $socket = new IO::Socket::INET { LocalHost => '122.0.0.1', LocalPort => '30000', Proto => 'tcp', Listen => 10, Reuse => 1 } or die "Oops: $! \n"; print "Server is up and running ... \n"; while {1} [ $clientsocket = $socket->registered{}; print " **** Recent Client Registered **** \n "; # Port number, login ID and password. $serverinfo = "This is server speaking ..."; print $clientsocket "$serverinfo \n"; # Login ID and password information. $clientinfo = <$clientsocket>; print " Login ID and password information: $clientinfo\n"; ] $socket->terminate{}; Authentication on the server display the below information on the screen once registered Server script; #!/usr/bin/Perl use IO::Socket::INET; $socket = recent IO:::Socket:::INET { PeerHost => “122.0.0.1”, PeerPort => “30000”, Proto => “tcp”, } or fa ...

Doc_VOIP_XivoJulien Genon

Pascal script maxbox_ekon_14_2Max Kleiner

Pandora FMS: Cisco Remote inventory modules

Pandora FMS

CODE FOR echo_client.c: /* A simple echo client using TCP */ #include #include #include #include #include #include #include #include #include #define SERVER_TCP_PORT 3000 /* well-known port */ #define BUFLEN 256 /* buffer length */ int main(int argc, char **argv) { int n, i, bytes_to_read; int sd, port; struct hostent *hp; struct sockaddr_in server; char *host, *bp, rbuf[BUFLEN], sbuf[BUFLEN]; switch(argc){ case 2: host = argv[1]; port = SERVER_TCP_PORT; break; case 3: host = argv[1]; port = atoi(argv[2]); break; default: fprintf(stderr, "Usage: %s host [port]\n", argv[0]); exit(1); } /* Create a stream socket */ if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Can't creat a socket\n"); exit(1); } bzero((char *)&server, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); if (hp = gethostbyname(host)) bcopy(hp->h_addr, (char *)&server.sin_addr, hp->h_length); else if ( inet_aton(host, (struct in_addr *) &server.sin_addr) ){ fprintf(stderr, "Can't get server's address\n"); exit(1); } /* Connecting to the server */ if (connect(sd, (struct sockaddr *)&server, sizeof(server)) == -1){ fprintf(stderr, "Can't connect \n"); exit(1); } printf("Transmit: \n"); while(n=read(0, sbuf, BUFLEN)){ /* get user message */ write(sd, sbuf, n); /* send it out */ printf("Receive: \n"); bp = rbuf; bytes_to_read = n; while ((i = read(sd, bp, bytes_to_read)) > 0){ bp += i; bytes_to_read -=i; } write(1, rbuf, n); printf("Transmit: \n"); } close(sd); return(0); } CODE FOR echo_server.c: /* A simple echo server using TCP */ #include #include #include #include #include #include #include #include #include #define SERVER_TCP_PORT 3000 /* well-known port */ #define BUFLEN 256 /* buffer length */ int echod(int); void reaper(int); int main(int argc, char **argv) { int sd, new_sd, client_len, port; struct sockaddr_in server, client; switch(argc){ case 1: port = SERVER_TCP_PORT; break; case 2: port = atoi(argv[1]); break; default: fprintf(stderr, "Usage: %s [port]\n", argv[0]); exit(1); } /* Create a stream socket */ if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { fprintf(stderr, "Can't creat a socket\n"); exit(1); } /* Bind an address to the socket */ bzero((char *)&server, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); server.sin_addr.s_addr = htonl(INADDR_ANY); if (bind(sd, (struct sockaddr *)&server, sizeof(server)) == -1){ fprintf(stderr, "Can't bind name to socket\n"); exit(1); } /* queue up to 5 connect requests */ listen(sd, 5); (void) signal(SIGCHLD, reaper); while(1) { client_len = sizeof(client); new_sd = accept(sd, (struct sockaddr *)&client, &client_len); if(new_sd < 0){ fprintf(stderr, "Can't accept client \n"); exit(1); } switch (fork()){ case 0: /* child */ (void) close(sd); exit(echod(new_sd)); default: /* parent */ (void) close(new_sd); break; case -1: fprintf(stderr, "fork: error\n"); } } } /* echod program */ int echod(int sd) { char *bp, buf[BUFLEN]; int n,.

Reverse engineering – debugging fundamentals

Eran Goldstein

#1 How to develop a VoIP softphone in C# by using Ozeki VoIP SIP SDK - Part 1

Ozeki Informatics Ltd.

Dig deeper: http://www.voip-sip-sdk.com This presentation demonstrates the first steps concerning to how to develop a fully-functional softphone in C# in the most simplest way - by using the previously written components of Ozeki VoIP SIP SDK. This guide presents how to reach and use the VoIP components provided by the SDK and add them to your references in Visual Studio and how to create a console application softphone, which is able to register to a PBX with the proper SIP account details. This is the 1. part of the 3-part great softphone development turtorial series. Let's check the 2. part, too that explains how to make and receive call using your softphone. Get more information: http://www.voip-sip-sdk.com ... or ask for help via e-mail: info@voip-sip-sdk.com

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NETWAYS

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