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mateuszvis |
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/*
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* pkgnet - pulls SvarDOS packages from the project's online repository
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* Copyright (C) 2021 Mateusz Viste
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*
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* PUBLISHED UNDER THE TERMS OF THE MIT LICENSE
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*
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* COPYRIGHT (C) 2016-2021 MATEUSZ VISTE, ALL RIGHTS RESERVED.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* http://svardos.osdn.io
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*/
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include "net.h"
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#define HOSTADDR "svardos.osdn.io"
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/* strips http headers and returns new buff len */
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static int detecthttpheadersend(char *buff, int len) {
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static char lastbyteislf = 0; /* static because I must potentially remember it for next packet/call */
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int i;
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for (i = 0; i < len; i++) {
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if (buff[i] == '\r') continue; /* ignore CR characters */
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if (buff[i] != '\n') {
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lastbyteislf = 0;
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continue;
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}
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/* cur byte is LF -> if last one was also LF then this is an empty line, meaning headers are over */
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if (lastbyteislf == 0) {
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lastbyteislf = 1;
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continue;
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}
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/* end of headers! rewind the buffer and return new len */
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len -= i;
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if (len > 0) memmove(buff, buff + i, len);
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return(len);
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}
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return(0);
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}
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int main(int argc, char **argv) {
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char buffer[4096];
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char url[64];
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struct net_tcpsocket *sock;
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time_t lastactivity;
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int headersdone;
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/* prepare the query */
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snprintf(url, sizeof(url), "/pkgnet.php?action=xxx");
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/* init network stack */
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if (net_init() != 0) {
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puts("ERROR: Network subsystem initialization failed");
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return(1);
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}
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puts(""); /* required because watt-32 likes to print out garbage sometimes ("configuring through DHCP...") */
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if (net_dnsresolve(buffer, HOSTADDR) != 0) {
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puts("ERROR: DNS resolution failed");
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return(1);
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}
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sock = net_connect(buffer, 80);
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if (sock == NULL) {
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puts("ERROR: failed to connect to " HOSTADDR);
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goto SHITQUIT;
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}
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/* wait for net_connect() to actually connect */
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for (;;) {
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int connstate;
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connstate = net_isconnected(sock, 1);
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if (connstate > 0) break;
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if (connstate < 0) {
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puts("ERROR: connection error");
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goto SHITQUIT;
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}
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}
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/* socket is connected - send the http request */
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snprintf(buffer, sizeof(buffer), "GET %s HTTP/1.1\r\nHOST: " HOSTADDR "\r\nUSER-AGENT: pkgnet\r\nConnection: close\r\n\r\n", url);
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if (net_send(sock, buffer, strlen(buffer)) != (int)strlen(buffer)) {
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puts("ERROR: failed to send HTTP query to remote server");
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goto SHITQUIT;
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}
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lastactivity = time(NULL);
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headersdone = 0;
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for (;;) {
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int byteread = net_recv(sock, buffer, sizeof(buffer) - 1);
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if (byteread < 0) break; /* end of connection */
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/* */
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if (byteread == 0) {
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if (time(NULL) - lastactivity > 20) { /* TIMEOUT! */
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puts("ERROR: Timeout while waiting for data");
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goto SHITQUIT;
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}
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/* waiting for packets - release a CPU cycle in the meantime */
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_asm int 28h;
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/* */
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continue;
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}
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if (byteread > 0) {
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buffer[byteread] = 0;
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lastactivity = time(NULL);
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/* skip headers: look for \r\n\r\n or \n\n within the stream */
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if (headersdone == 0) {
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byteread = detecthttpheadersend(buffer, byteread);
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headersdone = 1;
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if (byteread == 0) continue;
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}
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/* if downloading to file, write stuff to disk */
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printf("%s", buffer);
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}
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}
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net_close(sock);
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return(0);
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SHITQUIT:
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if (sock != NULL) net_abort(sock);
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return(1);
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}
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