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Diffstat (limited to '')
-rw-r--r-- | P4/util.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/P4/util.c b/P4/util.c new file mode 100644 index 0000000..2e2be63 --- /dev/null +++ b/P4/util.c @@ -0,0 +1,108 @@ +#ifndef _REENTRANT +#define _REENTRANT +#endif + +#include <stdio.h> +#include <pthread.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include "util.h" + +//Global socket for all things +int socket; + +/********************************************** + * init + - port is the number of the port you want the server to be + started on + - initializes the connection acception/handling system + - YOU MUST CALL THIS EXACTLY ONCE (not once per thread, + but exactly one time, in the main thread of your program) + BEFORE USING ANY OF THE FUNCTIONS BELOW + - if init encounters any errors, it will call exit(). +************************************************/ +void init(int port) { + struct sockaddr_in addr; + addr.sin_family = AF_INET; + addr.sin_addr.s_addr = htonl(INADDR_ANY); + addr.sin_port = htons(port); + //Allow port to be released + int enable = 1; + if (setsockopt(socket, SOL_SOCKET, SO_REUSEADDR, (char *)&enable, sizeof(int)) == -1) { + perror("Cannot set socket option"); + exit(EXIT_FAILURE); + } + if (bind(socket, (struct sockaddr*) &addr, sizeof(addr)) == -1) { + perror("Cannot bind socket"); + exit(EXIT_FAILURE); + } +} + +/********************************************** + * accept_connection - takes no parameters + - returns a file descriptor for further request processing. + DO NOT use the file descriptor on your own -- use + get_request() instead. + - if the return value is negative, the request should be ignored. +***********************************************/ +int accept_connection(void) { +} + +/********************************************** + * get_request + - parameters: + - fd is the file descriptor obtained by accept_connection() + from where you wish to get a request + - filename is the location of a character buffer in which + this function should store the requested filename. (Buffer + should be of size 1024 bytes.) + - returns 0 on success, nonzero on failure. You must account + for failures because some connections might send faulty + requests. This is a recoverable error - you must not exit + inside the thread that called get_request. After an error, you + must NOT use a return_request or return_error function for that + specific 'connection'. +************************************************/ +int get_request(int fd, char *filename) { +} + +/********************************************** + * return_result + - returns the contents of a file to the requesting client + - parameters: + - fd is the file descriptor obtained by accept_connection() + to where you wish to return the result of a request + - content_type is a pointer to a string that indicates the + type of content being returned. possible types include + "text/html", "text/plain", "image/gif", "image/jpeg" cor- + responding to .html, .txt, .gif, .jpg files. + - buf is a pointer to a memory location where the requested + file has been read into memory (the heap). return_result + will use this memory location to return the result to the + user. (remember to use -D_REENTRANT for CFLAGS.) you may + safely deallocate the memory after the call to + return_result (if it will not be cached). + - numbytes is the number of bytes the file takes up in buf + - returns 0 on success, nonzero on failure. +************************************************/ +int return_result(int fd, char *content_type, char *buf, int numbytes) { +} + +/********************************************** + * return_error + - returns an error message in response to a bad request + - parameters: + - fd is the file descriptor obtained by accept_connection() + to where you wish to return the error + - buf is a pointer to the location of the error text + - returns 0 on success, nonzero on failure. +************************************************/ +int return_error(int fd, char *buf) { +} |