WebSVN – SvarDOS – Diff – /pkg/trunk/pkginst.c


/*
 * This file is part of pkginst (SvarDOS)
 * Copyright (C) 2012-2021 Mateusz Viste
 * Changes by TK Chia
 */
 
#include <ctype.h>     /* toupper() */
#include <stdio.h>
#include <stdlib.h>    /* system() */
#include <string.h>    /* strcpy() */
#include <unistd.h>    /* read() */
#include <sys/types.h> /* struct utimbuf */
 
#include "crc32.h"     /* all CRC32 related stuff */
#include "fdnpkg.h"    /* PKGINST_SKIPLINKS... */
#include "helpers.h"   /* slash2backslash(), strtolower() */
#include "fileexst.h"
#include "kprintf.h"
#include "libunzip.h"  /* zip_listfiles()... */
#include "showinst.h"  /* pkg_loadflist() */
#include "pkginst.h"   /* include self for control */
#include "version.h"
 
 
/* return 1 if fname looks like a link filename, 0 otherwise */
static int islinkfile(char *fname) {
  char *link1 = "LINKS\\";
  char *link2 = "links\\";
  int x;
  for (x = 0; ; x++) {
    if (link1[x] == 0) return(1);
    if ((fname[x] != link1[x]) && (fname[x] != link2[x])) return(0);
  }
}
 
 
/* validate a filename (8+3, no weird characters, etc). returns 0 on success,
 * nonzero otherwise. */
static int validfilename(char *fname) {
  int i, i2;
  char *validchars = "!#$%&'()-@^_`{}~";
  int elemlen = 0;
  int elemmaxlen = 8; /* switches from 8 to 3 depending wheter I am analyzing
                         a filename or an extension */
  /* look for invalid chars in the entire string, and check the length of the
   * element at the same time */
  for (i = 0; fname[i] != 0; i++) {
    /* director separators are threated specially */
    if (fname[i] == '\\') {
      elemlen = 0;
      elemmaxlen = 8;
      continue;
    }
    /* '.' switches the check into extension mode */
    if (fname[i] == '.') {
      if (elemlen == 0) return(-1); /* a file must have a base name */
      if (elemmaxlen == 3) return(-2); /* a file cannot have two extensions */
      elemlen = 0;
      elemmaxlen = 3;
      continue;
    }
    /* check that the element is not too long */
    if (++elemlen > elemmaxlen) return(-3);
    /* look for valid characters */
    if ((fname[i] >= 'a') && (fname[i] <= 'z')) continue;
    if ((fname[i] >= 'A') && (fname[i] <= 'Z')) continue;
    if ((fname[i] >= '0') && (fname[i] <= '9')) continue;
    if ((fname[i] & 128) != 0) continue; /* high bytes are okay (NLS) */
    /* look for other valid characters */
    for (i2 = 0; validchars[i2] != 0; i2++) {
      if (fname[i] == validchars[i2]) break;
    }
    if (validchars[i2] != 0) continue;
    /* if we are here, then the character is invalid */
    return(-4);
  }
  /* all checks passed */
  return(0);
}
 
 
/* processes a link file - that is, reads the target inside, and overwrite
 * the file with new content */
static void processlinkfile(char *linkfile, char *dosdir, struct customdirs *dirlist, char *buff) {
  char origtarget[512];
  int x;
  char *shortfile;
  unsigned char comstub[] = { /* machine code of a COM stub launcher */
    0xBC,0x00,0x00,0xBB,0x00,0x10,0xB4,0x4A,0xCD,0x21,0xBB,0x2A,0x01,0x8C,0x5F,0x04,
    0x8C,0x5F,0x08,0x8C,0x5F,0x0C,0xB8,0x00,0x4B,0xBA,0x38,0x01,0xCD,0x21,0xB0,0x7F,
    0x72,0x04,0xB4,0x4D,0xCD,0x21,0xB4,0x4C,0xCD,0x21,0x00,0x00,0x80,0x00,0x00,0x00,
    0x5C,0x00,0x00,0x00,0x6C,0x00,0x00,0x00}; /* read comlink.asm for details */
  const unsigned stack_paras = 12;
  unsigned alloc_paras, alloc_bytes;
  FILE *fd;
  /* open the link file and read the original target */
  fd = fopen(linkfile, "r");
  if (fd == NULL) {
    kitten_printf(3, 21, "Error: Failed to open link file '%s' for read access.", linkfile);
    puts("");
    return;
  }
  x = fread(origtarget, 1, sizeof(origtarget) - 1, fd);
  origtarget[x] = 0;
  fclose(fd);
  /* validate the original target (ltrim to first \r or \n) */
  for (x = 0; origtarget[x] != 0; x++) {
    if ((origtarget[x] == '\r') || (origtarget[x] == '\n')) {
      origtarget[x] = 0;
      break;
    }
  }
  /* translate the original target to a local path */
  shortfile = computelocalpath(origtarget, buff, dosdir, dirlist);
  /* compute the amount of memory the stub should leave for itself:
	- 16 paragraphs needed for the PSP
	- sizeof(comstub) bytes needed for code and data
	- strlen(shortfile) + 1 for the command line
	- stack_paras paragraphs for the stack */
  alloc_paras = 16 + (sizeof(comstub) + strlen(shortfile) + 16) / 16 + stack_paras;
  alloc_bytes = 16 * alloc_paras;
  comstub[1] = alloc_bytes & 0xff;
  comstub[2] = alloc_bytes >> 8;
  comstub[4] = alloc_paras & 0xff;
  comstub[5] = alloc_paras >> 8;
  /* write new content into the link file */
  fd = fopen(linkfile, "wb");
  if (fd == NULL) {
    kitten_printf(3, 22, "Error: Failed to open link file '%s' for write access.", linkfile);
    puts("");
    return;
  }
  fwrite(comstub, 1, sizeof(comstub), fd);
  fprintf(fd, "%s%s%c", buff, shortfile, 0);
  fclose(fd);
}
 
 
/* returns 0 if pkgname is not installed, non-zero otherwise */
int is_package_installed(const char *pkgname, const char *dosdir) {
  char fname[512];
  sprintf(fname, "%s\\packages\\%s.lst", dosdir, pkgname);
  return(fileexists(fname)); /* file exists -> package is installed */
}
 
 
/* checks that pkgname is NOT installed. return 0 on success, non-zero otherwise. */
static int validate_package_not_installed(const char *pkgname, const char *dosdir) {
  if (is_package_installed(pkgname, dosdir) != 0) {
    kitten_printf(3, 18, "Package %s is already installed! You might want to use the 'update' action.", pkgname);
    puts("");
    return(-1);
  }
  return(0);
}
 
 
/* find a filename in a flist linked list, and returns a pointer to it */
static struct flist_t *findfileinlist(struct flist_t *flist, char *fname) {
  while (flist != NULL) {
    if (strcmp(flist->fname, fname) == 0) return(flist);
    flist = flist->next;
  }
  return(NULL);
}
 
 
/* prepare a package for installation. this is mandatory before actually installing it!
 * returns a pointer to the zip file's index on success, NULL on failure. the **zipfd pointer is updated with a file descriptor to the open zip file to install. */
struct ziplist *pkginstall_preparepackage(const char *pkgname, const char *zipfile, int flags, FILE **zipfd, const char *dosdir, const struct customdirs *dirlist, char *buffmem1k) {
  char *fname;
 
  char *appinfofile;
  int appinfopresence;
  char *shortfile;
  struct ziplist *ziplinkedlist = NULL, *curzipnode, *prevzipnode;
  struct flist_t *flist = NULL;
 
  fname = buffmem1k;
 
  appinfofile = buffmem1k + 512;
 
 
  sprintf(appinfofile, "appinfo\\%s.lsm", pkgname); /* Prepare the appinfo/xxxx.lsm filename string for later use */
 
  /* check if not already installed, if already here, print a message "you might want to use update instead"
   * of course this must not be done if we are in the process of upgrading said package */
  if (((flags & PKGINST_UPDATE) == 0) && (validate_package_not_installed(pkgname, dosdir) != 0)) {
    return(NULL);
  }
 
 
 
 
 
 
 
  /* Now let's check the content of the zip file */
 
  *zipfd = fopen(zipfile, "rb");
  if (*zipfd == NULL) {
    kitten_puts(3, 8, "Error: Invalid zip archive! Package not installed.");
    goto RAII;
  }
  ziplinkedlist = zip_listfiles(*zipfd);
  if (ziplinkedlist == NULL) {
    kitten_puts(3, 8, "Error: Invalid zip archive! Package not installed.");
    goto RAII;
  }
  /* if updating, load the list of files belonging to the current package */
  if ((flags & PKGINST_UPDATE) != 0) {
    flist = pkg_loadflist(pkgname, dosdir);
  }
  /* Verify that there's no collision with existing local files, look for the appinfo presence, get rid of sources if required, and rename BAT links into COM files */
  appinfopresence = 0;
  prevzipnode = NULL;
  for (curzipnode = ziplinkedlist; curzipnode != NULL;) {
    /* change all slashes to backslashes, and switch into all-lowercase */
    slash2backslash(curzipnode->filename);
    strtolower(curzipnode->filename);
    /* remove 'directory' ZIP entries to avoid false alerts about directory already existing */
    if ((curzipnode->flags & ZIP_FLAG_ISADIR) != 0) {
      curzipnode->filename[0] = 0; /* mark it "empty", will be removed in a short moment */
    }
    /* is it a "link file"? */
    if (fdnpkg_strcasestr(curzipnode->filename, "links\\") == curzipnode->filename) {
      /* skip links, if that's what the user wants */
      if ((flags & PKGINST_SKIPLINKS) != 0) {
        curzipnode->filename[0] = 0; /* in fact, we just mark the file as 'empty' on the filename.. see later below */
      } else {
        /* if it's a *.BAT link, then rename it to *.COM */
        char *ext = getfext(curzipnode->filename);
        if (strcasecmp(ext, "bat") == 0) sprintf(ext, "com");
      }
    }
 
    if (curzipnode->filename[0] == 0) { /* ignore empty filenames (maybe it was empty originally, or has been emptied because it's a dropped source or link) */
      if (prevzipnode == NULL) {  /* take the item out of the list */
        ziplinkedlist = curzipnode->nextfile;
        free(curzipnode); /* free the item */
        curzipnode = ziplinkedlist;
      } else {
        prevzipnode->nextfile = curzipnode->nextfile;
        free(curzipnode); /* free the item */
        curzipnode = prevzipnode->nextfile;
      }
      continue; /* go to the next item */
    }
    /* validate that the file has a valid filename (8+3, no shady chars...) */
    if (validfilename(curzipnode->filename) != 0) {
      kitten_puts(3, 23, "Error: Package contains an invalid filename:");
      printf(" %s\n", curzipnode->filename);
      goto RAII_ERR;
    }
    /* look out for collisions with already existing files (unless we are
     * updating the package and the local file belongs to it */
    shortfile = computelocalpath(curzipnode->filename, fname, dosdir, dirlist);
    strcat(fname, shortfile);
    if ((findfileinlist(flist, fname) == NULL) && (fileexists(fname) != 0)) {
      kitten_puts(3, 9, "Error: Package contains a file that already exists locally:");
      printf(" %s\n", fname);
      goto RAII_ERR;
    }
    /* abort if any entry is encrypted */
    if ((curzipnode->flags & ZIP_FLAG_ENCRYPTED) != 0) {
      kitten_printf(3, 20, "Error: Package contains an encrypted file:");
      puts("");
      printf(" %s\n", curzipnode->filename);
      goto RAII_ERR;
    }
    /* abort if any file is compressed with an unsupported method */
    if ((curzipnode->compmethod != 0/*store*/) && (curzipnode->compmethod != 8/*deflate*/)) { /* unsupported compression method */
      kitten_printf(8, 2, "Error: Package contains a file compressed with an unsupported method (%d):", curzipnode->compmethod);
      puts("");
      printf(" %s\n", curzipnode->filename);
      goto RAII_ERR;
    }
    if (strcmp(curzipnode->filename, appinfofile) == 0) appinfopresence = 1;
    prevzipnode = curzipnode;
    curzipnode = curzipnode->nextfile;
  }
  /* if appinfo file not found, this is not a real FreeDOS package */
  if (appinfopresence != 1) {
    kitten_printf(3, 12, "Error: Package do not contain the %s file! Not a valid FreeDOS package.", appinfofile);
    puts("");
    goto RAII_ERR;
  }
 
  goto RAII;
 
  RAII_ERR:
  zip_freelist(&ziplinkedlist);
  ziplinkedlist = NULL;
  if ((zipfd != NULL) && (*zipfd != NULL)) {
    fclose(*zipfd);
    *zipfd = NULL;
  }
 
  RAII:
  pkg_freeflist(flist);
  return(ziplinkedlist);
}
 
 
/* install a package that has been prepared already. returns 0 on success,
 * or a negative value on error, or a positive value on warning */
int pkginstall_installpackage(char *pkgname, char *dosdir, struct customdirs *dirlist, struct ziplist *ziplinkedlist, FILE *zipfd) {
  char *buff;
  char *fulldestfilename;
  char packageslst[64];
  char *shortfile;
  long filesextractedsuccess = 0, filesextractedfailure = 0;
  struct ziplist *curzipnode;
  FILE *lstfd;
 
  sprintf(packageslst, "packages\\%s.lst", pkgname); /* Prepare the packages/xxxx.lst filename string for later use */
 
  buff = malloc(512);
  fulldestfilename = malloc(1024);
  if ((buff == NULL) || (fulldestfilename == NULL)) {
    kitten_puts(8, 0, "Out of memory!");
    zip_freelist(&ziplinkedlist);
    free(buff);
    free(fulldestfilename);
    return(-1);
  }
 
  /* create the %DOSDIR%/packages directory, just in case it doesn't exist yet */
  sprintf(buff, "%s\\packages\\", dosdir);
  mkpath(buff);
 
  /* open the lst file */
  sprintf(buff, "%s\\%s", dosdir, packageslst);
  lstfd = fopen(buff, "wb"); /* opening it in binary mode, because I like to have control over line terminators (CR/LF) */
  if (lstfd == NULL) {
    kitten_printf(3, 10, "Error: Could not create %s!", buff);
    puts("");
    zip_freelist(&ziplinkedlist);
    free(buff);
    free(fulldestfilename);
    return(-2);
  }
 
  /* write list of files in zip into the lst, and create the directories structure */
  for (curzipnode = ziplinkedlist; curzipnode != NULL; curzipnode = curzipnode->nextfile) {
    int unzip_result;
    if ((curzipnode->flags & ZIP_FLAG_ISADIR) != 0) continue; /* skip directories */
    if (strcasecmp(curzipnode->filename, packageslst) == 0) continue; /* skip silently the package.lst file, if found */
    shortfile = computelocalpath(curzipnode->filename, buff, dosdir, dirlist); /* substitute paths to custom dirs */
    /* log the filename to packages\pkg.lst (with original, unmapped drive) */
    fprintf(lstfd, "%s%s\r\n", buff, shortfile);
    /* create the path, just in case it doesn't exist yet */
    mkpath(buff);
    sprintf(fulldestfilename, "%s%s", buff, shortfile);
    /* Now unzip the file */
    unzip_result = zip_unzip(zipfd, curzipnode, fulldestfilename);
    if (unzip_result != 0) {
      kitten_printf(8, 3, "Error while extracting '%s' to '%s'!", curzipnode->filename, fulldestfilename);
      printf(" [%d]\n", unzip_result);
      filesextractedfailure += 1;
    } else {
      printf(" %s -> %s\n", curzipnode->filename, buff);
      filesextractedsuccess += 1;
    }
    /* if it's a LINK file, recompute a new content */
    if (islinkfile(curzipnode->filename) != 0) {
      processlinkfile(fulldestfilename, dosdir, dirlist, buff);
    }
  }
  fclose(lstfd);
 
  /* free the ziplist and close file descriptor */
  zip_freelist(&ziplinkedlist);
  free(buff);
  free(fulldestfilename);
 
  kitten_printf(3, 19, "Package %s installed: %ld files extracted, %ld errors.", pkgname, filesextractedsuccess, filesextractedfailure);
  puts("");
  return(filesextractedfailure);
}
 
Subversion Repositories SvarDOS

(root)/pkg/trunk/pkginst.c @ 622 – Rev 230 → 233
