mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-09-09 17:13:20 +02:00
235 lines
7.3 KiB
C
235 lines
7.3 KiB
C
#include "http.h"
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extern char incommingIP[50];
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/**
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* Emptyblock is a statically defined variable for functions to return if they are unable
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* to complete a request
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*/
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const struct block emptyblock = {0, NULL};
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//The maximum amount of bytes to send per net_write() call
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#define NET_BUFFER_SIZE 1024
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// Write our message to the server
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static s32 send_message(s32 server, char *msg) {
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s32 bytes_transferred = 0;
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s32 remaining = strlen(msg);
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while (remaining) {
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if ((bytes_transferred = net_write(server, msg, remaining > NET_BUFFER_SIZE ? NET_BUFFER_SIZE : remaining)) > 0) {
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remaining -= bytes_transferred;
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usleep (20 * 1000);
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} else if (bytes_transferred < 0) {
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return bytes_transferred;
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} else {
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return -ENODATA;
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}
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}
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return 0;
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}
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/**
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* Connect to a remote server via TCP on a specified port
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*
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* @param u32 ip address of the server to connect to
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* @param u32 the port to connect to on the server
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* @return s32 The connection to the server (negative number if connection could not be established)
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*/
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static s32 server_connect(u32 ipaddress, u32 socket_port) {
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//Initialize socket
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s32 connection = net_socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
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if (connection < 0) return connection;
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struct sockaddr_in connect_addr;
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memset(&connect_addr, 0, sizeof(connect_addr));
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connect_addr.sin_family = AF_INET;
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connect_addr.sin_port = socket_port;
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connect_addr.sin_addr.s_addr= ipaddress;
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sprintf(incommingIP, "%s", inet_ntoa(connect_addr.sin_addr));
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//Attemt to open the socket
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if (net_connect(connection, (struct sockaddr*)&connect_addr, sizeof(connect_addr)) == -1) {
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net_close(connection);
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return -1;
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}
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return connection;
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}
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//The amount of memory in bytes reserved initially to store the HTTP response in
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//Be careful in increasing this number, reading from a socket on the Wii
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//will fail if you request more than 20k or so
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#define HTTP_BUFFER_SIZE 1024 * 5
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//The amount of memory the buffer should expanded with if the buffer is full
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#define HTTP_BUFFER_GROWTH 1024 * 5
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/**
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* This function reads all the data from a connection into a buffer which it returns.
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* It will return an empty buffer if something doesn't go as planned
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*
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* @param s32 connection The connection identifier to suck the response out of
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* @return block A 'block' struct (see http.h) in which the buffer is located
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*/
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struct block read_message(s32 connection) {
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//Create a block of memory to put in the response
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struct block buffer;
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buffer.data = malloc(HTTP_BUFFER_SIZE);
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buffer.size = HTTP_BUFFER_SIZE;
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if (buffer.data == NULL) {
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return emptyblock;
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}
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//The offset variable always points to the first byte of memory that is free in the buffer
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u32 offset = 0;
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while (1) {
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//Fill the buffer with a new batch of bytes from the connection,
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//starting from where we left of in the buffer till the end of the buffer
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s32 bytes_read = net_read(connection, buffer.data + offset, buffer.size - offset);
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//Anything below 0 is an error in the connection
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if (bytes_read < 0) {
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//printf("Connection error from net_read() Errorcode: %i\n", bytes_read);
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return emptyblock;
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}
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//No more bytes were read into the buffer,
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//we assume this means the HTTP response is done
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if (bytes_read == 0) {
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break;
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}
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offset += bytes_read;
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//Check if we have enough buffer left over,
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//if not expand it with an additional HTTP_BUFFER_GROWTH worth of bytes
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if (offset >= buffer.size) {
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buffer.size += HTTP_BUFFER_GROWTH;
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buffer.data = realloc(buffer.data, buffer.size);
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if (buffer.data == NULL) {
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return emptyblock;
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}
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}
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}
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//At the end of above loop offset should be precisely the amount of bytes that were read from the connection
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buffer.size = offset;
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//Shrink the size of the buffer so the data fits exactly in it
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realloc(buffer.data, buffer.size);
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return buffer;
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}
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/**
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* Downloads the contents of a URL to memory
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* This method is not threadsafe (because networking is not threadsafe on the Wii)
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*/
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struct block downloadfile(const char *url) {
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//Check if the url starts with "http://", if not it is not considered a valid url
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if (strncmp(url, "http://", strlen("http://")) != 0) {
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//printf("URL '%s' doesn't start with 'http://'\n", url);
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return emptyblock;
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}
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//Locate the path part of the url by searching for '/' past "http://"
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char *path = strchr(url + strlen("http://"), '/');
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//At the very least the url has to end with '/', ending with just a domain is invalid
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if (path == NULL) {
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//printf("URL '%s' has no PATH part\n", url);
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return emptyblock;
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}
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//Extract the domain part out of the url
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int domainlength = path - url - strlen("http://");
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if (domainlength == 0) {
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//printf("No domain part in URL '%s'\n", url);
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return emptyblock;
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}
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char domain[domainlength + 1];
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strlcpy(domain, url + strlen("http://"), domainlength+1);
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//Parsing of the URL is done, start making an actual connection
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u32 ipaddress = getipbynamecached(domain);
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if (ipaddress == 0) {
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//printf("\ndomain %s could not be resolved", domain);
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return emptyblock;
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}
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s32 connection = server_connect(ipaddress, 80);
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if (connection < 0) {
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//printf("Error establishing connection");
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return emptyblock;
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}
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//Form a nice request header to send to the webserver
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char* headerformat = "GET %s HTTP/1.0\r\nHost: %s\r\nUser-Agent: WiiEarthh 1.0\r\n\r\n";;
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char header[strlen(headerformat) + strlen(domain) + strlen(path)];
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sprintf(header, headerformat, path, domain);
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//Do the request and get the response
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send_message(connection, header);
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struct block response = read_message(connection);
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net_close(connection);
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//Search for the 4-character sequence \r\n\r\n in the response which signals the start of the http payload (file)
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unsigned char *filestart = NULL;
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u32 filesize = 0;
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int i;
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for (i = 3; i < response.size; i++) {
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if (response.data[i] == '\n' &&
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response.data[i-1] == '\r' &&
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response.data[i-2] == '\n' &&
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response.data[i-3] == '\r') {
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filestart = response.data + i + 1;
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filesize = response.size - i - 1;
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break;
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}
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}
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if (filestart == NULL) {
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//printf("HTTP Response was without a file\n");
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free(response.data);
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return emptyblock;
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}
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//Copy the file part of the response into a new memoryblock to return
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struct block file;
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file.data = malloc(filesize);
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file.size = filesize;
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if (file.data == NULL) {
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//printf("No more memory to copy file from HTTP response\n");
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free(response.data);
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return emptyblock;
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}
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memcpy(file.data, filestart, filesize);
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//Dispose of the original response
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free(response.data);
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return file;
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}
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s32 GetConnection(char * domain) {
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u32 ipaddress = getipbynamecached(domain);
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if (ipaddress == 0) {
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return -1;
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}
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s32 connection = server_connect(ipaddress, 80);
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return connection;
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}
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