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Commit 70ae4e90 authored by Terence Denning's avatar Terence Denning
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.vscode/ipch/3b8357e1f462b93a/http-server.ipch 0 → 100644
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.vscode/ipch/3b8357e1f462b93a/mmap_address.bin 0 → 100644
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.vscode/ipch/89191ee911ced97a/mmap_address.bin 0 → 100644
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.vscode/ipch/89191ee911ced97a/select-server.ipch 0 → 100644
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html/1_intro.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Image Tagger Game</h2>
<img src="https://swift.rc.nectar.org.au/v1/AUTH_eab314456b624071ac5aecd721b977f0/comp30023-project/image-3.jpg" alt="HTML5 Icon" style="width:700px;height:400px;">
<p>Welcome to the image tagging game. Please enter your name below.</p>
<form method="POST">
Name: <input type="text" name="user" />
<input type="submit" class="button" />
</form>
</body>
</html>
html/2_start.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Image Tagger Game</h2>
<img src="https://swift.rc.nectar.org.au/v1/AUTH_eab314456b624071ac5aecd721b977f0/comp30023-project/image-3.jpg" alt="HTML5 Icon" style="width:700px;height:400px;">
<form method="GET">
<input type="submit" class="button" name="start" value="Start"/>
</form>
<form method="POST">
<input type="submit" class="button" name="quit" value="Quit"/>
</form>
</body>
</html>
\ No newline at end of file
html/3_first_turn.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>You are ready now!</h2>
<img src="https://swift.rc.nectar.org.au/v1/AUTH_eab314456b624071ac5aecd721b977f0/comp30023-project/image-2.jpg" alt="HTML5 Icon" style="width:700px;height:400px;">
<p>Rule: Try to guess the above image by typing a keyword which describes it:</p>
<form method="POST">
Keyword: <input type="text" name="keyword" />
<input type="submit" class="button" name="guess" value="Guess" />
</form>
<form method="POST">
<input type="submit" class="button" name="quit" value="Quit"/>
</form>
</body>
</html>
html/4_accepted.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Keyword Accepted! Keep trying more.</h2>
<img src="https://swift.rc.nectar.org.au/v1/AUTH_eab314456b624071ac5aecd721b977f0/comp30023-project/image-2.jpg" alt="HTML5 Icon" style="width:700px;height:400px;">
<p>Rule: Try to guess the above image by typing a keyword which describes it:</p>
<form method="POST">
Keyword: <input type="text" name="keyword" />
<input type="submit" class="button" name="guess" value="Guess" />
</form>
<form method="POST">
<input type="submit" class="button" name="quit" value="Quit"/>
</form>
</body>
</html>
html/5_discarded.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Keyword Discarded. The other player is not ready yet.</h2>
<img src="https://swift.rc.nectar.org.au/v1/AUTH_eab314456b624071ac5aecd721b977f0/comp30023-project/image-2.jpg" alt="HTML5 Icon" style="width:700px;height:400px;">
<p>Rule: Try to guess the above image by typing a keyword which describes it:</p>
<form method="POST">
Keyword: <input type="text" name="keyword" />
<input type="submit" class="button" name="guess" value="Guess" />
</form>
<form method="POST">
<input type="submit" class="button" name="quit" value="Quit"/>
</form>
</body>
</html>
html/6_endgame.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Thanks for playing. The game is completed.</h2>
<p>Would you like to play it again?</p>
<form method="GET">
<input type="submit" class="button" name="start" value="Start"/>
</form>
<form method="POST">
<input type="submit" class="button" name="quit" value="Quit"/>
</form>
</body>
</html>
html/7_gameover.html 0 → 100644
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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<h2>Game Over!</h2>
</body>
</html>
http-server.c 0 → 100644
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/*
** http-server.c
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <strings.h>
#include <sys/select.h>
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <time.h>
// constants
static char const * const HTTP_200_FORMAT = "HTTP/1.1 200 OK\r\n\
Content-Type: text/html\r\n\
Content-Length: %ld\r\n\r\n";
static char const * const HTTP_400 = "HTTP/1.1 400 Bad Request\r\nContent-Length: 0\r\n\r\n";
static int const HTTP_400_LENGTH = 47;
static char const * const HTTP_404 = "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n";
static int const HTTP_404_LENGTH = 45;
// represents the types of method
typedef enum
{
GET,
POST,
UNKNOWN
} METHOD;
static bool handle_http_request(int sockfd)
{
// try to read the request
char buff[2049];
int n = read(sockfd, buff, 2049);
if (n <= 0)
{
if (n < 0)
perror("read");
else
printf("socket %d close the connection\n", sockfd);
return false;
}
// terminate the string
buff[n] = 0;
char * curr = buff;
printf("%s\n", curr);
// parse the method
METHOD method = UNKNOWN;
if (strncmp(curr, "GET ", 4) == 0)
{
curr += 4;
method = GET;
}
else if (strncmp(curr, "POST ", 5) == 0)
{
curr += 5;
method = POST;
}
else if (write(sockfd, HTTP_400, HTTP_400_LENGTH) < 0)
{
perror("write");
return false;
}
// sanitise the URI
while (*curr == '.' || *curr == '/')
++curr;
// assume the only valid request URI is "/" but it can be modified to accept more files
if (*curr == ' ')
if (method == GET)
{
char *webpage = "html/1_intro.html";
// get the size of the file
struct stat st;
stat(webpage, &st);
n = sprintf(buff, HTTP_200_FORMAT, st.st_size);
// send the header first
if (write(sockfd, buff, n) < 0)
{
perror("write");
return false;
}
// send the file
int filefd = open(webpage, O_RDONLY);
do
{
n = sendfile(sockfd, filefd, NULL, 2048);
}
while (n > 0);
if (n < 0)
{
perror("sendfile");
close(filefd);
return false;
}
close(filefd);
}
else if (method == POST)
{
// locate the username, it is safe to do so in this sample code, but usually the result is expected to be
// copied to another buffer using strcpy or strncpy to ensure that it will not be overwritten.
char * username = strstr(buff, "user=") + 5;
int username_length = strlen(username);
// the length needs to include the ", " before the username
long added_length = username_length + 2;
// get the size of the file
struct stat st;
stat("html/2_start.html", &st);
// increase file size to accommodate the username
long size = st.st_size + added_length;
n = sprintf(buff, HTTP_200_FORMAT, size);
// send the header first
if (write(sockfd, buff, n) < 0)
{
perror("write");
return false;
}
// read the content of the HTML file
int filefd = open("html/2_start.html", O_RDONLY);
n = read(filefd, buff, 2048);
if (n < 0)
{
perror("read");
close(filefd);
return false;
}
close(filefd);
// move the trailing part backward
int p1, p2;
for (p1 = size - 1, p2 = p1 - added_length; p1 >= size - 25; --p1, --p2)
buff[p1] = buff[p2];
++p2;
// put the separator
buff[p2++] = ',';
buff[p2++] = ' ';
// copy the username
strncpy(buff + p2, username, username_length);
if (write(sockfd, buff, size) < 0)
{
perror("write");
return false;
}
}
else
// never used, just for completeness
fprintf(stderr, "no other methods supported");
// send 404
else if (write(sockfd, HTTP_404, HTTP_404_LENGTH) < 0)
{
perror("write");
return false;
}
return true;
}
int main(int argc, char * argv[])
{
if (argc < 3)
{
fprintf(stderr, "usage: %s ip port\n", argv[0]);
return 0;
}
// create TCP socket which only accept IPv4
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
perror("socket");
exit(EXIT_FAILURE);
}
// reuse the socket if possible
int const reuse = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int)) < 0)
{
perror("setsockopt");
exit(EXIT_FAILURE);
}
// create and initialise address we will listen on
struct sockaddr_in serv_addr;
bzero(&serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
// if ip parameter is not specified
serv_addr.sin_addr.s_addr = inet_addr(argv[1]);
serv_addr.sin_port = htons(atoi(argv[2]));
// bind address to socket
if (bind(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
perror("bind");
exit(EXIT_FAILURE);
}
// listen on the socket
listen(sockfd, 5);
// initialise an active file descriptors set
fd_set masterfds;
FD_ZERO(&masterfds);
FD_SET(sockfd, &masterfds);
// record the maximum socket number
int maxfd = sockfd;
while (1)
{
// monitor file descriptors
fd_set readfds = masterfds;
if (select(FD_SETSIZE, &readfds, NULL, NULL, NULL) < 0)
{
perror("select");
exit(EXIT_FAILURE);
}
// loop all possible descriptor
for (int i = 0; i <= maxfd; ++i)
// determine if the current file descriptor is active
if (FD_ISSET(i, &readfds))
{
// create new socket if there is new incoming connection request
if (i == sockfd)
{
struct sockaddr_in cliaddr;
socklen_t clilen = sizeof(cliaddr);
int newsockfd = accept(sockfd, (struct sockaddr *)&cliaddr, &clilen);
if (newsockfd < 0)
perror("accept");
else
{
// add the socket to the set
FD_SET(newsockfd, &masterfds);
// update the maximum tracker
if (newsockfd > maxfd)
maxfd = newsockfd;
// print out the IP and the socket number
char ip[INET_ADDRSTRLEN];
printf(
"new connection from %s on socket %d\n",
// convert to human readable string
inet_ntop(cliaddr.sin_family, &cliaddr.sin_addr, ip, INET_ADDRSTRLEN),
newsockfd
);
}
}
// a request is sent from the client
else if (!handle_http_request(i))
{
close(i);
FD_CLR(i, &masterfds);
}
}
}
return 0;
}
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