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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 "20210121"
#define PDATE "2021"
#define HOSTADDR "svardos.osdn.io"
/* strips http headers and returns new buff len */
static int detecthttpheadersend(unsigned char *buff, int len) {
static char lastbyteislf = 0; /* static because I must potentially remember it for next packet/call */
int i;
for (i = 0; i < len; 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! rewind the buffer and return new len */
i += 1; /* add 1 to skip the current \n character */
len -= i;
if (len > 0) memmove(buff, buff + i, len + 1); /* +1 so I catch the string terminator as well */
return(len);
}
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);
}
/* 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;
int headersdone = 0;
int httpcode = -1;
long flen = 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, 1);
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 */
snprintf((char *)buffer, sizeof(buffer), "GET %s HTTP/1.1\r\nHOST: " HOSTADDR "\r\nUSER-AGENT: pkgnet\r\nConnection: close\r\n\r\n", url);
if (net_send(sock, (char *)buffer, strlen((char *)buffer)) != (int)strlen((char *)buffer)) {
puts("ERROR: failed to send HTTP query to remote server");
goto SHITQUIT;
}
lastactivity = time(NULL);
for (;;) {
int byteread = net_recv(sock, (char *)buffer, sizeof(buffer) - 1); /* -1 because I will append a NULL terminator */
if (byteread < 0) break; /* end of connection */
/* */
if (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;
/* */
continue;
}
if (byteread > 0) {
buffer[byteread] = 0;
lastactivity = time(NULL);
/* do I know the http code yet? */
if (httpcode < 0) {
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] == 0) continue; /* not enough data received */
if (buffer[spc] != ' ') {
puts("ERROR: server answered with invalid HTTP");
goto SHITQUIT;
}
httpcode = atoi((char *)(buffer + spc + 1));
/* on error, the answer should be always printed on screen */
if ((httpcode == 200) && (*outfname != 0)) {
fd = fopen(outfname, "wb");
if (fd == NULL) {
printf("ERROR: failed to create file %s", outfname);
puts("");
goto SHITQUIT;
}
}
}
/* skip headers: look for \r\n\r\n or \n\n within the stream */
if (headersdone == 0) {
byteread = detecthttpheadersend(buffer, byteread);
headersdone = 1;
if (byteread == 0) continue;
}
/* 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 the bsd sum */
for (i = 0; i < byteread; i++) {
/* rotr16 */
unsigned short bsumlsb = *bsum & 1;
*bsum >>= 1;
*bsum |= (bsumlsb << 15);
/* bsum += ch */
*bsum += buffer[i];
}
} else { /* otherwise dump to screen */
printf("%s", buffer);
}
}
}
net_close(sock);
return(flen);
SHITQUIT:
net_abort(sock);
return(-1);
}
/* 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);
}