42/42_SIDE_exam_06_miniserv
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asus
2023-02-06 15:44:48 +01:00
parent 5874252a02
commit 72f305d8eb
6 changed files with 302 additions and 0 deletions
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95
main.c Normal file
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#include <errno.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
int extract_message(char **buf, char **msg)
{
char *newbuf;
int i;
*msg = 0;
if (*buf == 0)
return (0);
i = 0;
while ((*buf)[i])
{
if ((*buf)[i] == '\n')
{
newbuf = calloc(1, sizeof(*newbuf) * (strlen(*buf + i + 1) + 1));
if (newbuf == 0)
return (-1);
strcpy(newbuf, *buf + i + 1);
*msg = *buf;
(*msg)[i + 1] = 0;
*buf = newbuf;
return (1);
}
i++;
}
return (0);
}
char *str_join(char *buf, char *add)
{
char *newbuf;
int len;
if (buf == 0)
len = 0;
else
len = strlen(buf);
newbuf = malloc(sizeof(*newbuf) * (len + strlen(add) + 1));
if (newbuf == 0)
return (0);
newbuf[0] = 0;
if (buf != 0)
strcat(newbuf, buf);
free(buf);
strcat(newbuf, add);
return (newbuf);
}
int main() {
int sockfd, connfd, len;
struct sockaddr_in servaddr, cli;
// socket create and verification
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
printf("socket creation failed...\n");
exit(0);
}
else
printf("Socket successfully created..\n");
bzero(&servaddr, sizeof(servaddr));
// assign IP, PORT
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(2130706433); //127.0.0.1
servaddr.sin_port = htons(8081);
// Binding newly created socket to given IP and verification
if ((bind(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr))) != 0) {
printf("socket bind failed...\n");
exit(0);
}
else
printf("Socket successfully binded..\n");
if (listen(sockfd, 10) != 0) {
printf("cannot listen\n");
exit(0);
}
len = sizeof(cli);
connfd = accept(sockfd, (struct sockaddr *)&cli, &len);
if (connfd < 0) {
printf("server acccept failed...\n");
exit(0);
}
else
printf("server acccept the client...\n");
}

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mini_serv.c Normal file
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// write
// close
// select
// socket
// accept
// listen
// send
// recv
// bind
// strstr
// malloc
// realloc
// free
// calloc
// bzero
// atoi
// sprintf
// strlen
// exit
// strcpy
// strcat
// memset
int main() {
int sockfd, connfd, len;
struct sockaddr_in servaddr, cli;
// socket create and verification
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
printf("socket creation failed...\n");
exit(0);
}
else
printf("Socket successfully created..\n");
bzero(&servaddr, sizeof(servaddr));
// assign IP, PORT
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(2130706433); //127.0.0.1
servaddr.sin_port = htons(8081);
// Binding newly created socket to given IP and verification
if ((bind(sockfd, (const struct sockaddr *)&servaddr, sizeof(servaddr))) != 0) {
printf("socket bind failed...\n");
exit(0);
}
else
printf("Socket successfully binded..\n");
if (listen(sockfd, 10) != 0) {
printf("cannot listen\n");
exit(0);
}
len = sizeof(cli);
connfd = accept(sockfd, (struct sockaddr *)&cli, &len);
if (connfd < 0) {
printf("server acccept failed...\n");
exit(0);
}
else
printf("server acccept the client...\n");
}

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mini_serv_ex.c Normal file
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#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/select.h>
typedef int bool;
bool check_arguments(int argc)
{
return (argc > 1);
}
void putstr_fd(char *str, int fd)
{
write(fd, str, strlen(str));
}
void arguments_error(void)
{
putstr_fd("Wrong number of arguments\n", 2);
exit(1);
}
void fatal_error(void)
{
putstr_fd("Fatal error\n", 2);
exit(1);
}
int get_port(char *arg)
{
int port = atoi(arg);
return (port);
}
int main(int argc, char **argv)
{
int port;
int server_fd;
int client_fd;
char buf[1024];
struct sockaddr_in addr;
socklen_t addr_len;
fd_set fds;
server_fd = socket(AF_INET, SOCK_STREAM, 0);
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr_len = sizeof(addr);
if (!check_arguments(argc))
arguments_error();
if ((port = get_port(argv[1])) == -1)
fatal_error();
printf("port = %d\n", port);
if (bind(server_fd, (struct sockaddr *)&addr, addr_len)== -1)
fatal_error();
if (listen(server_fd, 0) == -1)
fatal_error();
while (1)
{
if ((client_fd = accept(server_fd, (struct sockaddr *)&addr, &addr_len)) == -1)
fatal_error();
FD_ZERO(&fds);
FD_SET(client_fd, &fds);
select(client_fd + 1, &fds, NULL, NULL, NULL);
if (FD_ISSET(client_fd, &fds))
{
recv(client_fd, buf, 1024, 0);
printf("Recv: %s\n", buf);
}
}
return (0);
}

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server.py Normal file
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import socket
host = 'localhost'
port = 9999
address = (host, port)
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind((address))
server_socket.listen(5)
print ("Listening for client . . .")
conn, address = server_socket.accept()
print ("Connected to client at ", address)
while True:
try:
output = conn.recv(2048)
if output:
print ("Message received from client:")
print (output)
except:
sys.exit(0)

42
subject.en.txt Normal file
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Assignment name : mini_serv
Expected files : mini_serv.c
Allowed functions: write, close, select, socket, accept, listen, send, recv, bind, strstr, malloc, realloc, free, calloc, bzero, atoi, sprintf, strlen, exit, strcpy, strcat, memset
--------------------------------------------------------------------------------
Write a program that will listen for client to connect on a certain port on 127.0.0.1 and will let clients to speak with each other
This program will take as first argument the port to bind to
If no argument is given, it should write in stderr "Wrong number of arguments" followed by a \n and exit with status 1
If a System Calls returns an error before the program start accepting connection, it should write in stderr "Fatal error" followed by a \n and exit with status 1
If you cant allocate memory it should write in stderr "Fatal error" followed by a \n and exit with status 1
Your program must be non-blocking but client can be lazy and if they don't read your message you must NOT disconnect them...
Your program must not contains #define preproc
Your program must only listen to 127.0.0.1
The fd that you will receive will already be set to make 'recv' or 'send' to block if select hasn't be called before calling them, but will not block otherwise.
When a client connect to the server:
- the client will be given an id. the first client will receive the id 0 and each new client will received the last client id + 1
- %d will be replace by this number
- a message is sent to all the client that was connected to the server: "server: client %d just arrived\n"
clients must be able to send messages to your program.
- message will only be printable characters, no need to check
- a single message can contains multiple \n
- when the server receive a message, it must resend it to all the other client with "client %d: " before every line!
When a client disconnect from the server:
- a message is sent to all the client that was connected to the server: "server: client %d just left\n"
Memory or fd leaks are forbidden
To help you, you will find the file main.c with the beginning of a server and maybe some useful functions. (Beware this file use forbidden functions or write things that must not be there in your final program)
Warning our tester is expecting that you send the messages as fast as you can. Don't do un-necessary buffer.
Evaluation can be a bit longer than usual...
Hint: you can use nc to test your program
Hint: you should use nc to test your program
Hint: To test you can use fcntl(fd, F_SETFL, O_NONBLOCK) but use select and NEVER check EAGAIN (man 2 send)