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Diffstat (limited to 'dpkg-split/info.c')
-rw-r--r-- | dpkg-split/info.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/dpkg-split/info.c b/dpkg-split/info.c new file mode 100644 index 0000000..05d0d88 --- /dev/null +++ b/dpkg-split/info.c @@ -0,0 +1,266 @@ +/* + * dpkg-split - splitting and joining of multipart *.deb archives + * info.c - information about split archives + * + * Copyright © 1995 Ian Jackson <ian@chiark.greenend.org.uk> + * Copyright © 2008-2012 Guillem Jover <guillem@debian.org> + * + * 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 of the License, 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 <limits.h> +#include <ctype.h> +#include <string.h> +#include <unistd.h> +#include <ar.h> +#include <inttypes.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> + +#include <dpkg/i18n.h> +#include <dpkg/dpkg.h> +#include <dpkg/dpkg-db.h> +#include <dpkg/ar.h> +#include <dpkg/options.h> + +#include "dpkg-split.h" + +static intmax_t +parse_intmax(const char *value, const char *fn, const char *what) +{ + intmax_t r; + char *endp; + + r = strtoimax(value, &endp, 10); + if (value == endp || *endp) + ohshit(_("file `%.250s' is corrupt - bad digit (code %d) in %s"),fn,*endp,what); + return r; +} + +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; +} + +/** + * Read a deb-split part archive. + * + * @return Part info (nfmalloc'd) if was an archive part and we read it, + * NULL if it wasn't. + */ +struct partinfo *read_info(FILE *partfile, const char *fn, struct partinfo *ir) { + static char *readinfobuf= NULL; + static size_t readinfobuflen= 0; + + size_t thisilen; + intmax_t templong; + char magicbuf[sizeof(DPKG_AR_MAGIC) - 1], *rip, *partnums, *slash; + const char *err; + struct ar_hdr arh; + int c; + struct stat stab; + + if (fread(magicbuf, 1, sizeof(magicbuf), partfile) != sizeof(magicbuf)) { + if (ferror(partfile)) + ohshite(_("error reading %.250s"), fn); + else + return NULL; + } + if (memcmp(magicbuf, DPKG_AR_MAGIC, sizeof(magicbuf))) + return NULL; + + if (fread(&arh,1,sizeof(arh),partfile) != sizeof(arh)) rerreof(partfile,fn); + + dpkg_ar_normalize_name(&arh); + + if (strncmp(arh.ar_name, PARTMAGIC, sizeof(arh.ar_name)) != 0) + return NULL; + if (dpkg_ar_member_is_illegal(&arh)) + ohshit(_("file `%.250s' is corrupt - bad magic at end of first header"),fn); + thisilen = dpkg_ar_member_get_size(fn, &arh); + 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; + err = deb_version_parse(&ir->fmtversion, + nextline(&rip, fn, _("format version number"))); + if (err) + ohshit(_("file '%.250s' has invalid format version: %s"), fn, err); + if (ir->fmtversion.major != 2) + ohshit(_("file '%.250s' is format version %d.%d; get a newer dpkg-split"), + fn, ir->fmtversion.major, ir->fmtversion.minor); + + 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 = parse_intmax(nextline(&rip, fn, _("archive total size")), + fn, _("archive total size")); + ir->maxpartlen = parse_intmax(nextline(&rip, fn, _("archive part offset")), + fn, _("archive part offset")); + + partnums = nextline(&rip, fn, _("archive part numbers")); + slash= strchr(partnums,'/'); + if (!slash) + ohshit(_("file '%.250s' is corrupt - no slash between archive part numbers"), fn); + *slash++ = '\0'; + + templong = parse_intmax(slash, fn, _("number of archive parts")); + if (templong <= 0 || templong > INT_MAX) + ohshit(_("file '%.250s' is corrupt - bad number of archive parts"), fn); + ir->maxpartn= templong; + templong = parse_intmax(partnums, fn, _("archive parts number")); + if (templong <= 0 || templong > ir->maxpartn) + ohshit(_("file '%.250s' is corrupt - bad archive part number"),fn); + ir->thispartn= templong; + + /* If the package was created with dpkg 1.16.1 or later it will include + * the architecture. */ + if (*rip != '\0') + ir->arch = nfstrsave(nextline(&rip, fn, _("package architecture"))); + else + ir->arch = NULL; + + if (fread(&arh,1,sizeof(arh),partfile) != sizeof(arh)) rerreof(partfile,fn); + + dpkg_ar_normalize_name(&arh); + + if (dpkg_ar_member_is_illegal(&arh)) + 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 = dpkg_ar_member_get_size(fn, &arh); + 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 = (strlen(DPKG_AR_MAGIC) + + 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 = strlen(DPKG_AR_MAGIC) + + 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: %d.%d\n" + " Part of package: %s\n" + " ... version: %s\n" + " ... architecture: %s\n" + " ... MD5 checksum: %s\n" + " ... length: %jd bytes\n" + " ... split every: %jd bytes\n" + " Part number: %d/%d\n" + " Part length: %jd bytes\n" + " Part offset: %jd bytes\n" + " Part file size (used portion): %jd bytes\n\n"), + pi->filename, + pi->fmtversion.major, pi->fmtversion.minor, + pi->package, + pi->version, + pi->arch ? pi->arch : C_("architecture", "<unknown>"), + pi->md5sum, + (intmax_t)pi->orglength, + (intmax_t)pi->maxpartlen, + pi->thispartn, + pi->maxpartn, + (intmax_t)pi->thispartlen, + (intmax_t)pi->thispartoffset, + (intmax_t)pi->filesize); +} + +int +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>")); + } + + return 0; +} |