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- /*
- * dpkg-split - splitting and joining of multipart *.deb archives
- * info.c - information about split archives
- *
- * Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk>
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2,
- * or (at your option) any later version.
- *
- * This is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <config.h>
- #include <compat.h>
- #include <sys/stat.h>
- #include <assert.h>
- #include <limits.h>
- #include <ctype.h>
- #include <string.h>
- #include <unistd.h>
- #include <ar.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- #include <dpkg/myopt.h>
- #include "dpkg-split.h"
- static unsigned long unsignedlong(const char *value, const char *fn, const char *what) {
- unsigned long r;
- char *endp;
- r= strtoul(value,&endp,10);
- if (value == endp || *endp)
- ohshit(_("file `%.250s' is corrupt - bad digit (code %d) in %s"),fn,*endp,what);
- return r;
- }
- static unsigned long parseheaderlength(const char *inh, size_t len,
- const char *fn, const char *what) {
- char lintbuf[15];
- if (memchr(inh,0,len))
- ohshit(_("file `%.250s' is corrupt - %.250s length contains nulls"),fn,what);
- assert(sizeof(lintbuf) > len);
- memcpy(lintbuf,inh,len);
- lintbuf[len]= ' ';
- *strchr(lintbuf, ' ') = '\0';
- return unsignedlong(lintbuf,fn,what);
- }
- static char *nextline(char **ripp, const char *fn, const char *what) {
- char *newline, *rip;
- rip= *ripp;
- if (!rip) ohshit(_("file `%.250s' is corrupt - %.250s missing"),fn,what);
- newline= strchr(rip,'\n');
- if (!newline)
- ohshit(_("file `%.250s' is corrupt - missing newline after %.250s"),fn,what);
- *ripp= newline+1;
- while (newline > rip && isspace(newline[-1])) newline--;
- *newline = '\0';
- return rip;
- }
- struct partinfo *read_info(FILE *partfile, const char *fn, struct partinfo *ir) {
- /* returns info (nfmalloc'd) if was an archive part and we read it, 0 if it wasn't */
- static char *readinfobuf= NULL;
- static size_t readinfobuflen= 0;
- size_t thisilen;
- unsigned int templong;
- char magicbuf[sizeof(PARTMAGIC)-1], *rip, *partnums, *slash;
- struct ar_hdr arh;
- int c;
- struct stat stab;
-
- if (fread(magicbuf,1,sizeof(PARTMAGIC)-1,partfile) != sizeof(PARTMAGIC)-1) {
- if (ferror(partfile)) rerr(fn); else return NULL;
- }
- if (memcmp(magicbuf,PARTMAGIC,sizeof(magicbuf))) return NULL;
- if (fseek(partfile,-sizeof(arh.ar_name),SEEK_CUR))
- ohshite(_("unable to seek back"));
-
- if (fread(&arh,1,sizeof(arh),partfile) != sizeof(arh)) rerreof(partfile,fn);
- if (memcmp(arh.ar_fmag,ARFMAG,sizeof(arh.ar_fmag)))
- ohshit(_("file `%.250s' is corrupt - bad magic at end of first header"),fn);
- thisilen = parseheaderlength(arh.ar_size, sizeof(arh.ar_size), fn,
- _("info length"));
- if (thisilen >= readinfobuflen) {
- readinfobuflen= thisilen+1;
- readinfobuf= m_realloc(readinfobuf,readinfobuflen);
- }
- if (fread(readinfobuf,1,thisilen,partfile) != thisilen) rerreof(partfile,fn);
- if (thisilen & 1) {
- c= getc(partfile); if (c==EOF) rerreof(partfile,fn);
- if (c != '\n')
- ohshit(_("file `%.250s' is corrupt - bad padding character (code %d)"),fn,c);
- }
- readinfobuf[thisilen] = '\0';
- if (memchr(readinfobuf,0,thisilen))
- ohshit(_("file `%.250s' is corrupt - nulls in info section"),fn);
- ir->filename= fn;
- rip= readinfobuf;
- ir->fmtversion = nfstrsave(nextline(&rip, fn, _("format version number")));
- if (strcmp(ir->fmtversion,SPLITVERSION))
- ohshit(_("file `%.250s' is format version `%.250s' - you need a newer dpkg-split"),
- fn,ir->fmtversion);
- ir->package = nfstrsave(nextline(&rip, fn, _("package name")));
- ir->version = nfstrsave(nextline(&rip, fn, _("package version number")));
- ir->md5sum = nfstrsave(nextline(&rip, fn, _("package file MD5 checksum")));
- if (strlen(ir->md5sum) != MD5HASHLEN ||
- strspn(ir->md5sum, "0123456789abcdef") != MD5HASHLEN)
- ohshit(_("file `%.250s' is corrupt - bad MD5 checksum `%.250s'"),fn,ir->md5sum);
- ir->orglength = unsignedlong(nextline(&rip, fn, _("total length")), fn,
- _("total length"));
- ir->maxpartlen = unsignedlong(nextline(&rip, fn, _("part offset")), fn,
- _("part offset"));
-
- partnums = nextline(&rip, fn, _("part numbers"));
- slash= strchr(partnums,'/');
- if (!slash) ohshit(_("file `%.250s' is corrupt - no slash between part numbers"),fn);
- *slash++ = '\0';
- templong = unsignedlong(slash, fn, _("number of parts"));
- if (templong <= 0 || templong > INT_MAX)
- ohshit(_("file '%.250s' is corrupt - bad number of parts"), fn);
- ir->maxpartn= templong;
- templong = unsignedlong(partnums, fn, _("parts number"));
- if (templong <= 0 || templong > ir->maxpartn)
- ohshit(_("file `%.250s' is corrupt - bad part number"),fn);
- ir->thispartn= templong;
- if (fread(&arh,1,sizeof(arh),partfile) != sizeof(arh)) rerreof(partfile,fn);
- if (memcmp(arh.ar_fmag,ARFMAG,sizeof(arh.ar_fmag)))
- ohshit(_("file `%.250s' is corrupt - bad magic at end of second header"),fn);
- if (strncmp(arh.ar_name,"data",4))
- ohshit(_("file `%.250s' is corrupt - second member is not data member"),fn);
- ir->thispartlen = parseheaderlength(arh.ar_size, sizeof(arh.ar_size), fn,
- _("data length"));
- ir->thispartoffset= (ir->thispartn-1)*ir->maxpartlen;
- if (ir->maxpartn != (ir->orglength+ir->maxpartlen-1)/ir->maxpartlen)
- ohshit(_("file `%.250s' is corrupt - wrong number of parts for quoted sizes"),fn);
- if (ir->thispartlen !=
- (ir->thispartn == ir->maxpartn
- ? ir->orglength - ir->thispartoffset : ir->maxpartlen))
- ohshit(_("file `%.250s' is corrupt - size is wrong for quoted part number"),fn);
- ir->filesize= (SARMAG +
- sizeof(arh) + thisilen + (thisilen&1) +
- sizeof(arh) + ir->thispartlen + (ir->thispartlen&1));
- if (fstat(fileno(partfile),&stab)) ohshite(_("unable to fstat part file `%.250s'"),fn);
- if (S_ISREG(stab.st_mode)) {
- /* Don't do this check if it's coming from a pipe or something. It's
- * only an extra sanity check anyway.
- */
- if (stab.st_size < ir->filesize)
- ohshit(_("file `%.250s' is corrupt - too short"),fn);
- }
- ir->headerlen= SARMAG + sizeof(arh) + thisilen + (thisilen&1) + sizeof(arh);
-
- return ir;
- }
- void mustgetpartinfo(const char *filename, struct partinfo *ri) {
- FILE *part;
-
- part= fopen(filename,"r");
- if (!part) ohshite(_("cannot open archive part file `%.250s'"),filename);
- if (!read_info(part,filename,ri))
- ohshite(_("file `%.250s' is not an archive part"),filename);
- fclose(part);
- }
- void print_info(const struct partinfo *pi) {
- printf(_("%s:\n"
- " Part format version: %s\n"
- " Part of package: %s\n"
- " ... version: %s\n"
- " ... MD5 checksum: %s\n"
- " ... length: %lu bytes\n"
- " ... split every: %lu bytes\n"
- " Part number: %d/%d\n"
- " Part length: %zi bytes\n"
- " Part offset: %lu bytes\n"
- " Part file size (used portion): %lu bytes\n\n"),
- pi->filename,
- pi->fmtversion,
- pi->package,
- pi->version,
- pi->md5sum,
- pi->orglength,
- pi->maxpartlen,
- pi->thispartn,
- pi->maxpartn,
- pi->thispartlen,
- pi->thispartoffset,
- (unsigned long)pi->filesize);
- }
- void do_info(const char *const *argv) {
- const char *thisarg;
- struct partinfo *pi, ps;
- FILE *part;
- if (!*argv)
- badusage(_("--%s requires one or more part file arguments"),
- cipaction->olong);
-
- while ((thisarg= *argv++)) {
- part= fopen(thisarg,"r");
- if (!part) ohshite(_("cannot open archive part file `%.250s'"),thisarg);
- pi= read_info(part,thisarg,&ps);
- fclose(part);
- if (pi) {
- print_info(pi);
- } else {
- printf(_("file `%s' is not an archive part\n"),thisarg);
- }
- m_output(stdout, _("<standard output>"));
- }
- }
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