src/split/info.c

   1 /*
   2  * dpkg-split - splitting and joining of multipart *.deb archives
   3  * info.c - information about split archives
   4  *
   5  * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
   6  * Copyright © 2008-2012 Guillem Jover <guillem@debian.org>
   7  *
   8  * This is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  20  */
  21
  22 #include <config.h>
  23 #include <compat.h>
  24
  25 #include <sys/stat.h>
  26
  27 #include <errno.h>
  28 #include <limits.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31 #include <inttypes.h>
  32 #include <stdint.h>
  33 #include <stdlib.h>
  34 #include <stdio.h>
  35
  36 #include <dpkg/i18n.h>
  37 #include <dpkg/c-ctype.h>
  38 #include <dpkg/dpkg.h>
  39 #include <dpkg/dpkg-db.h>
  40 #include <dpkg/fdio.h>
  41 #include <dpkg/ar.h>
  42 #include <dpkg/options.h>
  43
  44 #include "dpkg-split.h"
  45
  46 static intmax_t
  47 parse_intmax(const char *value, const char *fn, const char *what)
  48 {
  49   intmax_t r;
  50   char *endp;
  51
  52   errno = 0;
  53   r = strtoimax(value, &endp, 10);
  54   if (value == endp || *endp)
  55     ohshit(_("file '%.250s' is corrupt - bad digit (code %d) in %s"),
  56            fn, *endp, what);
  57   if (r < 0 || errno == ERANGE)
  58     ohshit(_("file '%s' is corrupt; out of range integer in %s"), fn, what);
  59   return r;
  60 }
  61
  62 static char *nextline(char **ripp, const char *fn, const char *what) {
  63   char *newline, *rip;
  64
  65   rip= *ripp;
  66   if (!rip)
  67     ohshit(_("file '%.250s' is corrupt - %.250s missing"), fn, what);
  68   newline= strchr(rip,'\n');
  69   if (!newline)
  70     ohshit(_("file '%.250s' is corrupt - missing newline after %.250s"),
  71            fn, what);
  72   *ripp= newline+1;
  73
  74   str_rtrim_spaces(rip, newline);
  75
  76   return rip;
  77 }
  78
  79 /**
  80  * Read a deb-split part archive.
  81  *
  82  * @return Part info (nfmalloc'd) if was an archive part and we read it,
  83  *         NULL if it wasn't.
  84  */
  85 struct partinfo *
  86 read_info(struct dpkg_ar *ar, struct partinfo *ir)
  87 {
  88   static struct varbuf format_member = VARBUF_INIT;
  89
  90   size_t thisilen;
  91   intmax_t templong;
  92   char magicbuf[sizeof(DPKG_AR_MAGIC) - 1], *rip, *partnums, *slash;
  93   const char *err;
  94   struct dpkg_ar_hdr arh;
  95   ssize_t rc;
  96
  97   rc = fd_read(ar->fd, magicbuf, sizeof(magicbuf));
  98   if (rc != sizeof(magicbuf)) {
  99     if (rc < 0)
 100       ohshite(_("error reading %.250s"), ar->name);
 101     else
 102       return NULL;
 103   }
 104   if (memcmp(magicbuf, DPKG_AR_MAGIC, sizeof(magicbuf)))
 105     return NULL;
 106
 107   rc = fd_read(ar->fd, &arh, sizeof(arh));
 108   if (rc != sizeof(arh))
 109     read_fail(rc, ar->name, "ar header");
 110
 111   dpkg_ar_normalize_name(&arh);
 112
 113   if (strncmp(arh.ar_name, PARTMAGIC, sizeof(arh.ar_name)) != 0)
 114     return NULL;
 115   if (dpkg_ar_member_is_illegal(&arh))
 116     ohshit(_("file '%.250s' is corrupt - bad magic at end of first header"),
 117            ar->name);
 118   thisilen = dpkg_ar_member_get_size(ar, &arh);
 119
 120   varbuf_reset(&format_member);
 121   varbuf_grow(&format_member, thisilen + 2);
 122
 123   rc = fd_read(ar->fd, format_member.buf, thisilen + (thisilen & 1));
 124   if (rc != (ssize_t)(thisilen + (thisilen & 1)))
 125     read_fail(rc, ar->name, "reading header member");
 126   if (thisilen & 1) {
 127     int c = format_member.buf[thisilen];
 128
 129     if (c != '\n')
 130       ohshit(_("file '%.250s' is corrupt - bad padding character (code %d)"),
 131              ar->name, c);
 132   }
 133   varbuf_trunc(&format_member, thisilen);
 134   if (memchr(format_member.buf, 0, thisilen))
 135     ohshit(_("file '%.250s' is corrupt - nulls in info section"), ar->name);
 136
 137   ir->filename = ar->name;
 138
 139   rip = format_member.buf;
 140   err = deb_version_parse(&ir->fmtversion,
 141                           nextline(&rip, ar->name, _("format version number")));
 142   if (err)
 143     ohshit(_("file '%.250s' has invalid format version: %s"), ar->name, err);
 144   if (ir->fmtversion.major != 2)
 145     ohshit(_("file '%.250s' is format version %d.%d; get a newer dpkg-split"),
 146            ar->name, ir->fmtversion.major, ir->fmtversion.minor);
 147
 148   ir->package = nfstrsave(nextline(&rip, ar->name, _("package name")));
 149   ir->version = nfstrsave(nextline(&rip, ar->name, _("package version number")));
 150   ir->md5sum = nfstrsave(nextline(&rip, ar->name, _("package file MD5 checksum")));
 151   if (strlen(ir->md5sum) != MD5HASHLEN ||
 152       strspn(ir->md5sum, "0123456789abcdef") != MD5HASHLEN)
 153     ohshit(_("file '%.250s' is corrupt - bad MD5 checksum '%.250s'"),
 154            ar->name, ir->md5sum);
 155
 156   ir->orglength = parse_intmax(nextline(&rip, ar->name, _("archive total size")),
 157                                ar->name, _("archive total size"));
 158   ir->maxpartlen = parse_intmax(nextline(&rip, ar->name, _("archive part offset")),
 159                                 ar->name, _("archive part offset"));
 160
 161   partnums = nextline(&rip, ar->name, _("archive part numbers"));
 162   slash= strchr(partnums,'/');
 163   if (!slash)
 164     ohshit(_("file '%.250s' is corrupt - no slash between archive part numbers"), ar->name);
 165   *slash++ = '\0';
 166
 167   templong = parse_intmax(slash, ar->name, _("number of archive parts"));
 168   if (templong <= 0 || templong > INT_MAX)
 169     ohshit(_("file '%.250s' is corrupt - bad number of archive parts"), ar->name);
 170   ir->maxpartn= templong;
 171   templong = parse_intmax(partnums, ar->name, _("archive parts number"));
 172   if (templong <= 0 || templong > ir->maxpartn)
 173     ohshit(_("file '%.250s' is corrupt - bad archive part number"), ar->name);
 174   ir->thispartn= templong;
 175
 176   /* If the package was created with dpkg 1.16.1 or later it will include
 177    * the architecture. */
 178   if (*rip != '\0')
 179     ir->arch = nfstrsave(nextline(&rip, ar->name, _("package architecture")));
 180   else
 181     ir->arch = NULL;
 182
 183   rc = fd_read(ar->fd, &arh, sizeof(arh));
 184   if (rc != sizeof(arh))
 185     read_fail(rc, ar->name, "reading data part member ar header");
 186
 187   dpkg_ar_normalize_name(&arh);
 188
 189   if (dpkg_ar_member_is_illegal(&arh))
 190     ohshit(_("file '%.250s' is corrupt - bad magic at end of second header"),
 191            ar->name);
 192   if (strncmp(arh.ar_name,"data",4))
 193     ohshit(_("file '%.250s' is corrupt - second member is not data member"),
 194            ar->name);
 195
 196   ir->thispartlen = dpkg_ar_member_get_size(ar, &arh);
 197   ir->thispartoffset= (ir->thispartn-1)*ir->maxpartlen;
 198
 199   if (ir->maxpartn != (ir->orglength+ir->maxpartlen-1)/ir->maxpartlen)
 200     ohshit(_("file '%.250s' is corrupt - wrong number of parts for quoted sizes"),
 201            ar->name);
 202   if (ir->thispartlen !=
 203       (ir->thispartn == ir->maxpartn
 204        ? ir->orglength - ir->thispartoffset : ir->maxpartlen))
 205     ohshit(_("file '%.250s' is corrupt - size is wrong for quoted part number"),
 206            ar->name);
 207
 208   ir->filesize = (strlen(DPKG_AR_MAGIC) +
 209                   sizeof(arh) + thisilen + (thisilen & 1) +
 210                   sizeof(arh) + ir->thispartlen + (ir->thispartlen & 1));
 211
 212   if (S_ISREG(ar->mode)) {
 213     /* Don't do this check if it's coming from a pipe or something.  It's
 214      * only an extra sanity check anyway. */
 215     if (ar->size < ir->filesize)
 216       ohshit(_("file '%.250s' is corrupt - too short"), ar->name);
 217   }
 218
 219   ir->headerlen = strlen(DPKG_AR_MAGIC) +
 220                   sizeof(arh) + thisilen + (thisilen & 1) + sizeof(arh);
 221
 222   return ir;
 223 }
 224
 225 void mustgetpartinfo(const char *filename, struct partinfo *ri) {
 226   struct dpkg_ar *part;
 227
 228   part = dpkg_ar_open(filename);
 229   if (!part)
 230     ohshite(_("cannot open archive part file '%.250s'"), filename);
 231   if (!read_info(part, ri))
 232     ohshite(_("file '%.250s' is not an archive part"), filename);
 233   dpkg_ar_close(part);
 234 }
 235
 236 void print_info(const struct partinfo *pi) {
 237   printf(_("%s:\n"
 238          "    Part format version:            %d.%d\n"
 239          "    Part of package:                %s\n"
 240          "        ... version:                %s\n"
 241          "        ... architecture:           %s\n"
 242          "        ... MD5 checksum:           %s\n"
 243          "        ... length:                 %jd bytes\n"
 244          "        ... split every:            %jd bytes\n"
 245          "    Part number:                    %d/%d\n"
 246          "    Part length:                    %jd bytes\n"
 247          "    Part offset:                    %jd bytes\n"
 248          "    Part file size (used portion):  %jd bytes\n\n"),
 249          pi->filename,
 250          pi->fmtversion.major, pi->fmtversion.minor,
 251          pi->package,
 252          pi->version,
 253          pi->arch ? pi->arch : C_("architecture", "<unknown>"),
 254          pi->md5sum,
 255          (intmax_t)pi->orglength,
 256          (intmax_t)pi->maxpartlen,
 257          pi->thispartn,
 258          pi->maxpartn,
 259          (intmax_t)pi->thispartlen,
 260          (intmax_t)pi->thispartoffset,
 261          (intmax_t)pi->filesize);
 262 }
 263
 264 int
 265 do_info(const char *const *argv)
 266 {
 267   const char *thisarg;
 268
 269   if (!*argv)
 270     badusage(_("--%s requires one or more part file arguments"),
 271              cipaction->olong);
 272
 273   while ((thisarg= *argv++)) {
 274     struct partinfo *pi, ps;
 275     struct dpkg_ar *part;
 276
 277     part = dpkg_ar_open(thisarg);
 278     if (!part)
 279       ohshite(_("cannot open archive part file '%.250s'"), thisarg);
 280     pi = read_info(part, &ps);
 281     dpkg_ar_close(part);
 282     if (pi) {
 283       print_info(pi);
 284     } else {
 285       printf(_("file '%s' is not an archive part\n"), thisarg);
 286     }
 287     m_output(stdout, _("<standard output>"));
 288   }
 289
 290   return 0;
 291 }