325 lines
8.5 KiB
C
325 lines
8.5 KiB
C
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/* unpack the payload of RPM package to the current directory
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*
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* File name: rpmextract.c
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* Date: 2009/12/18
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* Author: Martin Sivak <msivak at redhat dot com>
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*
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* Copyright (C) 2009 Red Hat, Inc. All rights reserved.
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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 2 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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <rpm/rpmlib.h> /* rpmReadPackageFile .. */
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#include <rpm/rpmtag.h>
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#include <rpm/rpmio.h>
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#include <rpm/rpmpgp.h>
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#include <rpm/rpmts.h>
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#include <stdio.h>
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#include <archive.h>
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#include <archive_entry.h>
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#include "loader.h"
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#include "log.h"
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#include "rpmextract.h"
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/*
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* internal structure to pass to libarchive callbacks
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*/
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struct cpio_mydata {
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FD_t gzdi;
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char *buffer;
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};
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/*
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* libarchive callbacks
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*/
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ssize_t rpm_myread(struct archive *a, void *client_data, const void **buff)
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{
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struct cpio_mydata *mydata = client_data;
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*buff = mydata->buffer;
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return Fread(mydata->buffer, BUFFERSIZE, 1, mydata->gzdi);
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}
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int rpm_myclose(struct archive *a, void *client_data)
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{
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struct cpio_mydata *mydata = client_data;
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if (mydata->gzdi > 0)
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Fclose(mydata->gzdi);
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return ARCHIVE_OK;
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}
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/* read data from RPM header */
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const char * headerGetString(Header h, rpmTag tag)
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{
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const char *res = NULL;
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struct rpmtd_s td;
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if (headerGet(h, tag, &td, HEADERGET_MINMEM)) {
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if (rpmtdCount(&td) == 1) {
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res = rpmtdGetString(&td);
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}
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rpmtdFreeData(&td);
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}
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return res;
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}
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/*
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* explode source RPM into the current directory
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* use filters to skip packages and files we do not need
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*/
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int explodeRPM(const char *source,
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filterfunc filter,
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dependencyfunc provides,
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dependencyfunc deps,
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void* userptr)
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{
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char buffer[BUFFERSIZE+1]; /* make space for trailing \0 */
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FD_t fdi;
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Header h;
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char * rpmio_flags = NULL;
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rpmRC rc;
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FD_t gzdi;
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struct archive *cpio;
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struct archive_entry *cpio_entry;
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struct cpio_mydata cpio_mydata;
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rpmts ts;
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rpmVSFlags vsflags;
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const char *compr;
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if (strcmp(source, "-") == 0)
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fdi = fdDup(STDIN_FILENO);
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else
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fdi = Fopen(source, "r.ufdio");
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if (Ferror(fdi)) {
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const char *srcname = (strcmp(source, "-") == 0) ? "<stdin>" : source;
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logMessage(ERROR, "%s: %s\n", srcname, Fstrerror(fdi));
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return EXIT_FAILURE;
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}
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rpmReadConfigFiles(NULL, NULL);
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/* Initialize RPM transaction */
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ts = rpmtsCreate();
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vsflags = 0;
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/* Do not check digests, signatures or headers */
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vsflags |= _RPMVSF_NODIGESTS;
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vsflags |= _RPMVSF_NOSIGNATURES;
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vsflags |= RPMVSF_NOHDRCHK;
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(void) rpmtsSetVSFlags(ts, vsflags);
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rc = rpmReadPackageFile(ts, fdi, "rpm2dir", &h);
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ts = rpmtsFree(ts);
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switch (rc) {
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case RPMRC_OK:
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case RPMRC_NOKEY:
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case RPMRC_NOTTRUSTED:
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break;
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case RPMRC_NOTFOUND:
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logMessage(ERROR, "%s is not an RPM package", source);
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return EXIT_FAILURE;
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break;
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case RPMRC_FAIL:
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default:
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logMessage(ERROR, "error reading header from %s package\n", source);
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return EXIT_FAILURE;
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break;
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}
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/* Retrieve all dependencies and run them through deps function */
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while (deps) {
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struct rpmtd_s td;
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const char *depname;
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if (!headerGet(h, RPMTAG_REQUIRENAME, &td, HEADERGET_MINMEM))
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break;
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/* iterator */
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while ((depname = rpmtdNextString(&td))) {
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if (deps(depname, userptr)) {
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Fclose(fdi);
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return EXIT_BADDEPS;
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}
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}
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rpmtdFreeData(&td);
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break;
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}
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/* Retrieve all provides and run them through provides function */
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while (provides) {
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struct rpmtd_s td;
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const char *depname;
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int found = 0;
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if (!headerGet(h, RPMTAG_PROVIDES, &td, HEADERGET_MINMEM))
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break;
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/* iterator */
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while ((depname = rpmtdNextString(&td))) {
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if (!provides(depname, userptr)) {
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found++;
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}
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}
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rpmtdFreeData(&td);
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if (found<=0)
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return EXIT_BADDEPS;
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break;
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}
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/* Retrieve type of payload compression. */
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compr = headerGetString(h, RPMTAG_PAYLOADCOMPRESSOR);
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if (compr && strcmp(compr, "gzip")) {
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checked_asprintf(&rpmio_flags, "r.%sdio", compr);
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}
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else {
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checked_asprintf(&rpmio_flags, "r.gzdio");
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}
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/* Open uncompressed cpio stream */
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gzdi = Fdopen(fdi, rpmio_flags);
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free(rpmio_flags);
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if (gzdi == NULL) {
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logMessage(ERROR, "cannot re-open payload: %s\n", Fstrerror(gzdi));
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return EXIT_FAILURE;
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}
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/* initialize cpio decompressor */
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cpio = archive_read_new();
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if (cpio==NULL) {
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Fclose(gzdi);
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return -1;
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}
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cpio_mydata.gzdi = gzdi;
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cpio_mydata.buffer = buffer;
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archive_read_support_compression_all(cpio);
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archive_read_support_format_all(cpio);
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rc = archive_read_open(cpio, &cpio_mydata, NULL, rpm_myread, rpm_myclose);
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/* check the status of archive_open */
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if (rc != ARCHIVE_OK){
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Fclose(gzdi);
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return -1;
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}
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/* read all files in cpio archive */
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while ((rc = archive_read_next_header(cpio, &cpio_entry)) == ARCHIVE_OK){
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const struct stat *fstat;
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int64_t fsize;
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const char* filename;
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int needskip = 1; /* do we need to read the data to get to the next header? */
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int offset = 0;
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int towrite = 0;
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filename = archive_entry_pathname(cpio_entry);
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fstat = archive_entry_stat(cpio_entry);
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fsize = archive_entry_size(cpio_entry);
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/* Strip leading slashes */
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while (filename[offset] == '/')
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offset+=1;
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/* Strip leading ./ */
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while (filename[offset] == '.' && filename[offset+1] == '/')
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offset+=2;
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/* Other file type - we do not care except special cases */
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if (!S_ISREG(fstat->st_mode))
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towrite = 1;
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else
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towrite = 2;
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if (filter && filter(filename+offset, fstat, userptr)) {
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/* filter this file */
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towrite = 0;
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}
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/* Create directories */
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char* dirname = strdup(filename+offset);
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/* If the dup fails, let's hope the dirs already exist */
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if (dirname){
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char* dirptr = dirname;
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while (dirptr && *dirptr) {
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dirptr = strchr(dirptr, '/');
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if (dirptr) {
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*dirptr = 0;
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mkdir(dirname, 0700);
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*dirptr = '/';
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dirptr++;
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}
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}
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free(dirname);
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}
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/* Regular file */
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if (towrite>=2) {
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FILE *fdout = fopen(filename+offset, "w");
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if (fdout==NULL){
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rc = 33;
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break;
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}
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rc = archive_read_data_into_fd(cpio, fileno(fdout));
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if (rc!=ARCHIVE_OK) {
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/* XXX We didn't get the file.. well.. */
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needskip = 0;
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} else {
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needskip = 0;
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fclose(fdout);
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}
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}
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/* symlink, we assume that the path contained in symlink
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* is shorter than BUFFERSIZE */
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while (towrite && S_ISLNK(fstat->st_mode)) {
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char symlinkbuffer[BUFFERSIZE-1];
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needskip = 0;
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if ((rc = archive_read_data(cpio, symlinkbuffer, fsize))!=ARCHIVE_OK) {
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/* XXX We didn't get the file.. well.. */
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break;
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}
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if (symlink(buffer, filename+offset)) {
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logMessage(ERROR, "Failed to create symlink %s -> %s", filename+offset, buffer);
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}
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break;
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}
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if(needskip)
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archive_read_data_skip(cpio);
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}
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archive_read_finish(cpio);
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return rc != ARCHIVE_OK;
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}
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