mirror of
https://github.com/ventoy/Ventoy.git
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160 lines
3.8 KiB
C
160 lines
3.8 KiB
C
/******************************************************************************
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* vtoyloader.c ---- ventoy loader (wapper for binary loader)
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*
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* Copyright (c) 2020, longpanda <admin@ventoy.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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static int verbose = 0;
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#define debug(fmt, ...) if(verbose) printf(fmt, ##__VA_ARGS__)
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static int vine_patch_loader(unsigned char *buf, int len, int major)
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{
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int i;
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int ptrlen;
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unsigned int *data1;
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unsigned int *data2;
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/*
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* http://vinelinux.ime.cmc.osaka-u.ac.jp/Vine-6.5/SRPMS/SRPMS.main/anaconda-vine-11.0.2.1-1vl7.src.rpm
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* http://vinelinux.ime.cmc.osaka-u.ac.jp/Vine-6.5/SRPMS/SRPMS.main/kudzu-1.2.86-3vl6.src.rpm
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* anaconda-vine-11.0.2.1
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* isys/devnodes.c
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* static struct devnum devices[] = {
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* { "aztcd", 29, 0, 0 },
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* { "pcd", 46, 0, 0 },
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*
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* Patch 29 ---> 253
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*/
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ptrlen = (buf[4] == 1) ? 4 : 8;
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debug("ELF %d bit major:%d ptrlen:%d\n", (buf[4] == 1) ? 32 : 64, major, ptrlen);
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for (i = 0; i < len - 8 - 8 - ptrlen; i++)
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{
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data1 = (unsigned int *)(buf + i);
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data2 = (unsigned int *)(buf + i + 8 + ptrlen);
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if (data1[0] == 0x1D && data1[1] == 0x00 && data2[0] == 0x2E && data2[1] == 0x00)
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{
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debug("Find aztcd patch point at %d\n", i);
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data1[0] = major;
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break;
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}
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}
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for (i = 0; i < len; i++)
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{
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if (buf[i] != '/')
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{
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continue;
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}
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data1 = (unsigned int *)(buf + i + 1);
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/* /proc/ide */
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if (data1[0] == 0x636F7270 && data1[1] == 0x6564692F)
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{
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debug("patch string %s\n", (char *)(buf + i));
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buf[i + 1] = 'v';
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buf[i + 2] = 't';
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buf[i + 3] = 'o';
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buf[i + 4] = 'y';
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}
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}
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return 0;
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}
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int vtoyvine_main(int argc, char **argv)
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{
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int i;
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int len;
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unsigned char *buf;
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FILE *fp;
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for (i = 0; i < argc; i++)
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{
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if (argv[i][0] == '-' && argv[i][1] == 'v')
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{
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verbose = 1;
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break;
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}
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}
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fp = fopen(argv[1], "rb");
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if (!fp)
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{
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fprintf(stderr, "Failed to open file %s err:%d\n", argv[1], errno);
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return 1;
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}
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fseek(fp, 0, SEEK_END);
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len = (int)ftell(fp);
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debug("file length:%d\n", len);
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fseek(fp, 0, SEEK_SET);
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buf = (unsigned char *)malloc(len);
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if (!buf)
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{
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fclose(fp);
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return 1;
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}
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fread(buf, 1, len, fp);
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fclose(fp);
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vine_patch_loader(buf, len, (int)strtoul(argv[2], NULL, 10));
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fp = fopen(argv[1], "wb+");
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if (!fp)
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{
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fprintf(stderr, "Failed to open file %s err:%d\n", argv[1], errno);
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free(buf);
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return 1;
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}
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debug("write new data length:%d\n", len);
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fwrite(buf, 1, len, fp);
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fclose(fp);
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free(buf);
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return 0;
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}
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// wrapper main
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#ifndef BUILD_VTOY_TOOL
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int main(int argc, char **argv)
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{
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return vtoyvine_main(argc, argv);
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}
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#endif
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