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/*
* pkgnet - pulls SvarDOS packages from the project's online repository
* Copyright (C) 2021 Mateusz Viste
*
* PUBLISHED UNDER THE TERMS OF THE MIT LICENSE
*
* COPYRIGHT (C) 2016-2021 MATEUSZ VISTE, ALL RIGHTS RESERVED.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* http://svardos.osdn.io
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "net.h"
#define PVER "20210520"
#define PDATE "2021"
#define HOSTADDR "svardos.osdn.io"
/* returns length of all http headers, or 0 if uncomplete yet */
static unsigned short detecthttpheadersend(const unsigned char *buff) {
char lastbyteislf = 0;
unsigned short i;
for (i = 0; buff[i] != 0; i++) {
if (buff[i] == '\r') continue; /* ignore CR characters */
if (buff[i] != '\n') {
lastbyteislf = 0;
continue;
}
/* cur byte is LF -> if last one was also LF then this is an empty line, meaning headers are over */
if (lastbyteislf == 0) {
lastbyteislf = 1;
continue;
}
/* end of headers! return length of headers */
return(i + 1); /* add 1 to skip the current \n character */
}
return(0);
}
static void help(void) {
puts("pkgnet ver " PVER " -- Copyright (C) " PDATE " Mateusz Viste");
puts("");
puts("pkgnet is the SvarDOS package downloader.");
puts("");
puts("usage: pkgnet search <term>");
puts(" pkgnet pull <package>");
puts(" pkgnet checkup");
puts("");
puts("actions:");
puts(" search - asks remote repository for the list of matching packages");
puts(" pull - downloads package into current directory");
puts(" checkup - lists updates available for your system");
puts("");
}
/* parses command line arguments and fills outfname and url accordingly
* returns 0 on success, non-zero otherwise */
static int parseargv(int argc, char * const *argv, char *outfname, char *url) {
*outfname = 0;
*url = 0;
if ((argc == 3) && (strcasecmp(argv[1], "search") == 0)) {
sprintf(url, "/repo/?a=search&p=%s", argv[2]);
} else if ((argc == 3) && (strcasecmp(argv[1], "pull") == 0)) {
if ((strlen(argv[2]) > 8) || (argv[2][0] == 0)) {
puts("ERROR: package name must be 8 characters maximum");
return(-1);
}
sprintf(url, "/repo/?a=pull&p=%s", argv[2]);
sprintf(outfname, "%s.zip", argv[2]);
} else if ((argc == 2) && (strcasecmp(argv[1], "checkup") == 0)) {
puts("NOT SUPPORTED YET");
return(-1);
} else {
help();
return(-1);
}
return(0);
}
static int htget_headers(unsigned char *buffer, size_t buffersz, struct net_tcpsocket *sock, int *httpcode) {
unsigned char *buffptr = buffer;
unsigned short bufflen = 0;
int byteread;
time_t starttime = time(NULL);
for (;;) {
byteread = net_recv(sock, buffptr, buffersz - (bufflen + 1)); /* -1 because I will append a NULL terminator */
if (byteread > 0) { /* got data */
int hdlen;
bufflen += byteread;
buffptr += byteread;
buffer[bufflen] = 0;
hdlen = detecthttpheadersend(buffer);
if (hdlen > 0) { /* full headers - parse http code and continue processing */
int spc;
/* find the first space (HTTP/1.1 200 OK) */
for (spc = 0; spc < 16; spc++) {
if (buffer[spc] == ' ') break;
if (buffer[spc] == 0) break;
}
if (buffer[spc] != ' ') return(-1);
*httpcode = atoi((char *)(buffer + spc + 1));
/* rewind the buffer */
bufflen -= hdlen;
memmove(buffer, buffer + hdlen, bufflen);
return(bufflen); /* move to body processing now */
}
} else if (byteread < 0) { /* abort on error */
return(-2); /* unexpected end of connection (while waiting for all http headers) */
} else { /* else no data received - look for timeout and release a cpu cycle */
if (time(NULL) - starttime > 20) return(-3); /* TIMEOUT! */
_asm int 28h; /* release a CPU cycle */
}
}
}
/* fetch http data from ipaddr using url
* write result to file outfname if not null, or print to stdout otherwise
* fills bsum with the BSD sum of the data
* returns the length of data obtained, or neg value on error */
static long htget(const char *ipaddr, const char *url, const char *outfname, unsigned short *bsum) {
struct net_tcpsocket *sock;
unsigned char buffer[4096];
time_t lastactivity, lastprogressoutput = 0;
int httpcode = -1;
int byteread;
long flen = 0, lastflen = 0;
FILE *fd = NULL;
sock = net_connect(ipaddr, 80);
if (sock == NULL) {
puts("ERROR: failed to connect to " HOSTADDR);
goto SHITQUIT;
}
/* wait for net_connect() to actually connect */
for (;;) {
int connstate = net_isconnected(sock);
if (connstate > 0) break;
if (connstate < 0) {
puts("ERROR: connection error");
goto SHITQUIT;
}
_asm int 28h; /* DOS idle */
}
/* socket is connected - send the http request (MUST be HTTP/1.0 because I do not support chunked transfers!) */
snprintf((char *)buffer, sizeof(buffer), "GET %s HTTP/1.0\r\nHOST: " HOSTADDR "\r\nUSER-AGENT: pkgnet\r\nConnection: close\r\n\r\n", url);
if (net_send(sock, buffer, strlen((char *)buffer)) != (int)strlen((char *)buffer)) {
puts("ERROR: failed to send HTTP query to remote server");
goto SHITQUIT;
}
/* receive and process HTTP headers */
byteread = htget_headers(buffer, sizeof(buffer), sock, &httpcode);
/* transmission error? */
if (byteread < 0) {
printf("ERROR: communication error (%d)", byteread);
puts("");
goto SHITQUIT;
}
/* open destination file if required and if no server-side error occured */
if ((httpcode == 200) && (*outfname != 0)) {
fd = fopen(outfname, "wb");
if (fd == NULL) {
printf("ERROR: failed to create file %s", outfname);
puts("");
goto SHITQUIT;
}
}
/* read body of the answer */
lastactivity = time(NULL);
for (;; byteread = net_recv(sock, buffer, sizeof(buffer) - 1)) { /* read 1 byte less because I need to append a NULL terminator */
if (byteread > 0) { /* got data */
buffer[byteread] = 0;
lastactivity = time(NULL);
/* if downloading to file, write stuff to disk */
if (fd != NULL) {
int i;
if (fwrite(buffer, 1, byteread, fd) != byteread) {
printf("ERROR: failed to write data to file %s after %ld bytes", outfname, flen);
puts("");
break;
}
flen += byteread;
/* update progress once a sec */
if (lastprogressoutput != lastactivity) {
lastprogressoutput = lastactivity;
printf("%ld KiB (%ld KiB/s) \r", flen >> 10, (flen >> 10) - (lastflen >> 10)); /* trailing spaces are meant to avoid leaving garbage on screen if speed goes from, say, 1000 KiB/s to 9 KiB/s */
lastflen = flen;
fflush(stdout); /* avoid console buffering */
}
/* update the bsd sum */
for (i = 0; i < byteread; i++) {
/* rotr16 */
unsigned short bsumlsb = *bsum & 1;
*bsum >>= 1;
*bsum |= (bsumlsb << 15);
*bsum += buffer[i];
}
} else { /* otherwise dump to screen */
printf("%s", buffer);
}
} else if (byteread < 0) { /* end of connection */
break;
} else { /* check for timeout (byteread == 0) */
if (time(NULL) - lastactivity > 20) { /* TIMEOUT! */
puts("ERROR: Timeout while waiting for data");
goto SHITQUIT;
}
/* waiting for packets - release a CPU cycle in the meantime */
_asm int 28h;
}
}
goto ALLGOOD;
SHITQUIT:
flen = -1;
ALLGOOD:
if (fd != NULL) fclose(fd);
net_close(sock);
return(flen);
}
/* checks if file exists, returns 0 if not, non-zero otherwise */
static int fexists(const char *fname) {
FILE *fd = fopen(fname, "rb");
if (fd == NULL) return(0);
fclose(fd);
return(1);
}
int main(int argc, char **argv) {
char ipaddr[64];
char url[64];
unsigned short bsum = 0;
char outfname[16];
long flen;
/* parse command line arguments */
if (parseargv(argc, argv, outfname, url) != 0) return(1);
/* if outfname requested, make sure that file does not exist yet */
if (fexists(outfname)) {
printf("ERROR: file %s already exists", outfname);
puts("");
return(1);
}
/* init network stack */
if (net_init() != 0) {
puts("ERROR: Network subsystem initialization failed");
return(1);
}
puts(""); /* required because watt-32 likes to print out garbage sometimes ("configuring through DHCP...") */
if (net_dnsresolve(ipaddr, HOSTADDR) != 0) {
puts("ERROR: DNS resolution failed");
return(1);
}
flen = htget(ipaddr, url, outfname, &bsum);
if (flen < 1) return(1);
if (*outfname != 0) {
/* print bsum, size, filename */
printf("Downloaded %ld KiB into %s (BSUM: %04X)", flen >> 10, outfname, bsum);
puts("");
}
return(0);
}