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pacman/lib/libalpm/be_package.c

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/*
* be_package.c : backend for packages
*
* Copyright (c) 2006-2011 Pacman Development Team <pacman-dev@archlinux.org>
* Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
*
* This program 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 program 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 <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/* libarchive */
#include <archive.h>
#include <archive_entry.h>
/* libalpm */
#include "alpm_list.h"
#include "alpm.h"
#include "util.h"
#include "log.h"
#include "handle.h"
#include "package.h"
#include "deps.h" /* _alpm_splitdep */
struct package_changelog {
struct archive *archive;
int fd;
};
/**
* Open a package changelog for reading. Similar to fopen in functionality,
* except that the returned 'file stream' is from an archive.
* @param pkg the package (file) to read the changelog
* @return a 'file stream' to the package changelog
*/
static void *_package_changelog_open(alpm_pkg_t *pkg)
{
ASSERT(pkg != NULL, return NULL);
struct package_changelog *changelog;
struct archive *archive;
struct archive_entry *entry;
const char *pkgfile = pkg->origin_data.file;
struct stat buf;
int fd;
fd = _alpm_open_archive(pkg->handle, pkgfile, &buf,
&archive, ALPM_ERR_PKG_OPEN);
if(fd < 0) {
return NULL;
}
while(archive_read_next_header(archive, &entry) == ARCHIVE_OK) {
const char *entry_name = archive_entry_pathname(entry);
if(strcmp(entry_name, ".CHANGELOG") == 0) {
changelog = malloc(sizeof(struct package_changelog));
if(!changelog) {
pkg->handle->pm_errno = ALPM_ERR_MEMORY;
archive_read_finish(archive);
CLOSE(fd);
return NULL;
}
changelog->archive = archive;
changelog->fd = fd;
return changelog;
}
}
/* we didn't find a changelog */
archive_read_finish(archive);
CLOSE(fd);
errno = ENOENT;
return NULL;
}
/**
* Read data from an open changelog 'file stream'. Similar to fread in
* functionality, this function takes a buffer and amount of data to read.
* @param ptr a buffer to fill with raw changelog data
* @param size the size of the buffer
* @param pkg the package that the changelog is being read from
* @param fp a 'file stream' to the package changelog
* @return the number of characters read, or 0 if there is no more data
*/
static size_t _package_changelog_read(void *ptr, size_t size,
const alpm_pkg_t UNUSED *pkg, void *fp)
{
struct package_changelog *changelog = fp;
ssize_t sret = archive_read_data(changelog->archive, ptr, size);
/* Report error (negative values) */
if(sret < 0) {
RET_ERR(pkg->handle, ALPM_ERR_LIBARCHIVE, 0);
} else {
return (size_t)sret;
}
}
/**
* Close a package changelog for reading. Similar to fclose in functionality,
* except that the 'file stream' is from an archive.
* @param pkg the package (file) that the changelog was read from
* @param fp a 'file stream' to the package changelog
* @return whether closing the package changelog stream was successful
*/
static int _package_changelog_close(const alpm_pkg_t UNUSED *pkg, void *fp)
{
int ret;
struct package_changelog *changelog = fp;
ret = archive_read_finish(changelog->archive);
CLOSE(changelog->fd);
free(changelog);
return ret;
}
/** Package file operations struct accessor. We implement this as a method
* rather than a static struct as in be_files because we want to reuse the
* majority of the default_pkg_ops struct and add only a few operations of
* our own on top.
*/
static struct pkg_operations *get_file_pkg_ops(void)
{
static struct pkg_operations file_pkg_ops;
static int file_pkg_ops_initialized = 0;
if(!file_pkg_ops_initialized) {
file_pkg_ops = default_pkg_ops;
file_pkg_ops.changelog_open = _package_changelog_open;
file_pkg_ops.changelog_read = _package_changelog_read;
file_pkg_ops.changelog_close = _package_changelog_close;
file_pkg_ops_initialized = 1;
}
return &file_pkg_ops;
}
/**
* Parses the package description file for a package into a alpm_pkg_t struct.
* @param archive the archive to read from, pointed at the .PKGINFO entry
* @param newpkg an empty alpm_pkg_t struct to fill with package info
*
* @return 0 on success, -1 on error
*/
static int parse_descfile(alpm_handle_t *handle, struct archive *a, alpm_pkg_t *newpkg)
{
char *ptr = NULL;
char *key = NULL;
int ret, linenum = 0;
struct archive_read_buffer buf;
memset(&buf, 0, sizeof(buf));
/* 512K for a line length seems reasonable */
buf.max_line_size = 512 * 1024;
/* loop until we reach EOF or other error */
while((ret = _alpm_archive_fgets(a, &buf)) == ARCHIVE_OK) {
size_t len = _alpm_strip_newline(buf.line);
linenum++;
if(len == 0 || buf.line[0] == '#') {
continue;
}
ptr = buf.line;
key = strsep(&ptr, "=");
if(key == NULL || ptr == NULL) {
_alpm_log(handle, ALPM_LOG_DEBUG, "%s: syntax error in description file line %d\n",
newpkg->name ? newpkg->name : "error", linenum);
} else {
key = _alpm_strtrim(key);
while(*ptr == ' ') ptr++;
ptr = _alpm_strtrim(ptr);
if(strcmp(key, "pkgname") == 0) {
STRDUP(newpkg->name, ptr, return -1);
newpkg->name_hash = _alpm_hash_sdbm(newpkg->name);
} else if(strcmp(key, "pkgbase") == 0) {
/* not used atm */
} else if(strcmp(key, "pkgver") == 0) {
STRDUP(newpkg->version, ptr, return -1);
} else if(strcmp(key, "pkgdesc") == 0) {
STRDUP(newpkg->desc, ptr, return -1);
} else if(strcmp(key, "group") == 0) {
newpkg->groups = alpm_list_add(newpkg->groups, strdup(ptr));
} else if(strcmp(key, "url") == 0) {
STRDUP(newpkg->url, ptr, return -1);
} else if(strcmp(key, "license") == 0) {
newpkg->licenses = alpm_list_add(newpkg->licenses, strdup(ptr));
} else if(strcmp(key, "builddate") == 0) {
newpkg->builddate = _alpm_parsedate(ptr);
} else if(strcmp(key, "packager") == 0) {
STRDUP(newpkg->packager, ptr, return -1);
} else if(strcmp(key, "arch") == 0) {
STRDUP(newpkg->arch, ptr, return -1);
} else if(strcmp(key, "size") == 0) {
/* size in the raw package is uncompressed (installed) size */
newpkg->isize = _alpm_strtoofft(ptr);
} else if(strcmp(key, "depend") == 0) {
alpm_depend_t *dep = _alpm_splitdep(ptr);
newpkg->depends = alpm_list_add(newpkg->depends, dep);
} else if(strcmp(key, "optdepend") == 0) {
newpkg->optdepends = alpm_list_add(newpkg->optdepends, strdup(ptr));
} else if(strcmp(key, "conflict") == 0) {
alpm_depend_t *conflict = _alpm_splitdep(ptr);
newpkg->conflicts = alpm_list_add(newpkg->conflicts, conflict);
} else if(strcmp(key, "replaces") == 0) {
alpm_depend_t *replace = _alpm_splitdep(ptr);
newpkg->replaces = alpm_list_add(newpkg->replaces, replace);
} else if(strcmp(key, "provides") == 0) {
alpm_depend_t *provide = _alpm_splitdep(ptr);
newpkg->provides = alpm_list_add(newpkg->provides, provide);
} else if(strcmp(key, "backup") == 0) {
alpm_backup_t *backup;
CALLOC(backup, 1, sizeof(alpm_backup_t), return -1);
STRDUP(backup->name, ptr, return -1);
newpkg->backup = alpm_list_add(newpkg->backup, backup);
} else if(strcmp(key, "force") == 0) {
/* deprecated, skip it */
} else if(strcmp(key, "makepkgopt") == 0) {
/* not used atm */
} else {
_alpm_log(handle, ALPM_LOG_DEBUG, "%s: unknown key '%s' in description file line %d\n",
newpkg->name ? newpkg->name : "error", key, linenum);
}
}
}
if(ret != ARCHIVE_EOF) {
_alpm_log(handle, ALPM_LOG_DEBUG, "error parsing package descfile\n");
return -1;
}
return 0;
}
static void files_merge(alpm_file_t a[], alpm_file_t b[], alpm_file_t c[],
size_t m, size_t n)
{
size_t i = 0, j = 0, k = 0;
while(i < m && j < n) {
if(strcmp(a[i].name, b[j].name) < 0) {
c[k++] = a[i++];
} else {
c[k++] = b[j++];
}
}
while(i < m) {
c[k++] = a[i++];
}
while(j < n) {
c[k++] = b[j++];
}
}
static alpm_file_t *files_msort(alpm_file_t *files, size_t n)
{
alpm_file_t *work;
size_t blocksize = 1;
CALLOC(work, n, sizeof(alpm_file_t), return NULL);
for(blocksize = 1; blocksize < n; blocksize *= 2) {
size_t i, max_extent = 0;
for(i = 0; i < n - blocksize; i += 2 * blocksize) {
/* this limits our actual merge to the length of the array, since we will
* not likely be a perfect power of two. */
size_t right_blocksize = blocksize;
if(i + blocksize * 2 > n) {
right_blocksize = n - i - blocksize;
}
files_merge(files + i, files + i + blocksize, work + i,
blocksize, right_blocksize);
max_extent = i + blocksize + right_blocksize;
}
/* ensure we only copy what we actually touched on this merge pass,
* no more, no less */
memcpy(files, work, max_extent * sizeof(alpm_file_t));
}
free(work);
return files;
}
/**
* Validate a package.
* @param handle the context handle
* @param pkgfile path to the package file
* @param syncpkg package object to load verification data from (md5sum,
* sha256sum, and/or base64 signature)
* @param level the required level of signature verification
* @param sigdata signature data from the package to pass back
* @return 0 if package is fully valid, -1 and pm_errno otherwise
*/
int _alpm_pkg_validate_internal(alpm_handle_t *handle,
const char *pkgfile, alpm_pkg_t *syncpkg, alpm_siglevel_t level,
alpm_siglist_t **sigdata)
{
int has_sig;
handle->pm_errno = 0;
if(pkgfile == NULL || strlen(pkgfile) == 0) {
RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1);
}
/* attempt to access the package file, ensure it exists */
if(access(pkgfile, R_OK) != 0) {
RET_ERR(handle, ALPM_ERR_PKG_NOT_FOUND, -1);
}
/* can we get away with skipping checksums? */
has_sig = 0;
if(level & ALPM_SIG_PACKAGE) {
if(syncpkg && syncpkg->base64_sig) {
has_sig = 1;
} else {
char *sigpath = _alpm_sigpath(handle, pkgfile);
if(sigpath && !_alpm_access(handle, NULL, sigpath, R_OK)) {
has_sig = 1;
}
free(sigpath);
}
}
if(syncpkg && !has_sig) {
if(syncpkg->md5sum && !syncpkg->sha256sum) {
_alpm_log(handle, ALPM_LOG_DEBUG, "md5sum: %s\n", syncpkg->md5sum);
_alpm_log(handle, ALPM_LOG_DEBUG, "checking md5sum for %s\n", pkgfile);
if(_alpm_test_checksum(pkgfile, syncpkg->md5sum, ALPM_CSUM_MD5) != 0) {
RET_ERR(handle, ALPM_ERR_PKG_INVALID_CHECKSUM, -1);
}
}
if(syncpkg->sha256sum) {
_alpm_log(handle, ALPM_LOG_DEBUG, "sha256sum: %s\n", syncpkg->sha256sum);
_alpm_log(handle, ALPM_LOG_DEBUG, "checking sha256sum for %s\n", pkgfile);
if(_alpm_test_checksum(pkgfile, syncpkg->sha256sum, ALPM_CSUM_SHA256) != 0) {
RET_ERR(handle, ALPM_ERR_PKG_INVALID_CHECKSUM, -1);
}
}
}
/* even if we don't have a sig, run the check code if level tells us to */
if(has_sig || level & ALPM_SIG_PACKAGE) {
const char *sig = syncpkg ? syncpkg->base64_sig : NULL;
_alpm_log(handle, ALPM_LOG_DEBUG, "sig data: %s\n", sig ? sig : "<from .sig>");
if(_alpm_check_pgp_helper(handle, pkgfile, sig,
level & ALPM_SIG_PACKAGE_OPTIONAL, level & ALPM_SIG_PACKAGE_MARGINAL_OK,
level & ALPM_SIG_PACKAGE_UNKNOWN_OK, sigdata)) {
handle->pm_errno = ALPM_ERR_PKG_INVALID_SIG;
return -1;
}
}
return 0;
}
/**
* Load a package and create the corresponding alpm_pkg_t struct.
* @param handle the context handle
* @param pkgfile path to the package file
* @param full whether to stop the load after metadata is read or continue
* through the full archive
*/
alpm_pkg_t *_alpm_pkg_load_internal(alpm_handle_t *handle,
const char *pkgfile, int full)
{
int ret, fd, config = 0;
struct archive *archive;
struct archive_entry *entry;
alpm_pkg_t *newpkg = NULL;
struct stat st;
size_t files_count = 0, files_size = 0;
alpm_file_t *files = NULL;
if(pkgfile == NULL || strlen(pkgfile) == 0) {
RET_ERR(handle, ALPM_ERR_WRONG_ARGS, NULL);
}
fd = _alpm_open_archive(handle, pkgfile, &st, &archive, ALPM_ERR_PKG_OPEN);
if(fd < 0) {
if(errno == ENOENT) {
handle->pm_errno = ALPM_ERR_PKG_NOT_FOUND;
}
goto error;
}
newpkg = _alpm_pkg_new();
if(newpkg == NULL) {
handle->pm_errno = ALPM_ERR_MEMORY;
goto error;
}
STRDUP(newpkg->filename, pkgfile,
handle->pm_errno = ALPM_ERR_MEMORY; goto error);
newpkg->size = st.st_size;
_alpm_log(handle, ALPM_LOG_DEBUG, "starting package load for %s\n", pkgfile);
/* If full is false, only read through the archive until we find our needed
* metadata. If it is true, read through the entire archive, which serves
* as a verfication of integrity and allows us to create the filelist. */
while((ret = archive_read_next_header(archive, &entry)) == ARCHIVE_OK) {
const char *entry_name = archive_entry_pathname(entry);
if(strcmp(entry_name, ".PKGINFO") == 0) {
/* parse the info file */
if(parse_descfile(handle, archive, newpkg) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not parse package description file in %s\n"),
pkgfile);
goto pkg_invalid;
}
if(newpkg->name == NULL || strlen(newpkg->name) == 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("missing package name in %s\n"), pkgfile);
goto pkg_invalid;
}
if(newpkg->version == NULL || strlen(newpkg->version) == 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("missing package version in %s\n"), pkgfile);
goto pkg_invalid;
}
config = 1;
continue;
} else if(strcmp(entry_name, ".INSTALL") == 0) {
newpkg->scriptlet = 1;
} else if(*entry_name == '.') {
/* for now, ignore all files starting with '.' that haven't
* already been handled (for future possibilities) */
} else if(full) {
/* Keep track of all files for filelist generation */
if(files_count >= files_size) {
size_t old_size = files_size;
if(files_size == 0) {
files_size = 4;
} else {
files_size *= 2;
}
files = realloc(files, sizeof(alpm_file_t) * files_size);
if(!files) {
ALLOC_FAIL(sizeof(alpm_file_t) * files_size);
goto error;
}
/* ensure all new memory is zeroed out, in both the initial
* allocation and later reallocs */
memset(files + old_size, 0,
sizeof(alpm_file_t) * (files_size - old_size));
}
STRDUP(files[files_count].name, entry_name, goto error);
files[files_count].size = archive_entry_size(entry);
files[files_count].mode = archive_entry_mode(entry);
files_count++;
}
if(archive_read_data_skip(archive)) {
_alpm_log(handle, ALPM_LOG_ERROR, _("error while reading package %s: %s\n"),
pkgfile, archive_error_string(archive));
handle->pm_errno = ALPM_ERR_LIBARCHIVE;
goto error;
}
/* if we are not doing a full read, see if we have all we need */
if(!full && config) {
break;
}
}
if(ret != ARCHIVE_EOF && ret != ARCHIVE_OK) { /* An error occured */
_alpm_log(handle, ALPM_LOG_ERROR, _("error while reading package %s: %s\n"),
pkgfile, archive_error_string(archive));
handle->pm_errno = ALPM_ERR_LIBARCHIVE;
goto error;
}
if(!config) {
_alpm_log(handle, ALPM_LOG_ERROR, _("missing package metadata in %s\n"), pkgfile);
goto pkg_invalid;
}
archive_read_finish(archive);
CLOSE(fd);
/* internal fields for package struct */
newpkg->origin = PKG_FROM_FILE;
newpkg->origin_data.file = strdup(pkgfile);
newpkg->ops = get_file_pkg_ops();
newpkg->handle = handle;
newpkg->infolevel = INFRQ_BASE | INFRQ_DESC | INFRQ_SCRIPTLET;
if(full) {
if(files) {
/* attempt to hand back any memory we don't need */
files = realloc(files, sizeof(alpm_file_t) * files_count);
/* "checking for conflicts" requires a sorted list, ensure that here */
_alpm_log(handle, ALPM_LOG_DEBUG,
"sorting package filelist for %s\n", pkgfile);
newpkg->files.files = files_msort(files, files_count);
}
newpkg->files.count = files_count;
newpkg->infolevel |= INFRQ_FILES;
}
return newpkg;
pkg_invalid:
handle->pm_errno = ALPM_ERR_PKG_INVALID;
error:
_alpm_pkg_free(newpkg);
archive_read_finish(archive);
if(fd >= 0) {
CLOSE(fd);
}
return NULL;
}
int SYMEXPORT alpm_pkg_load(alpm_handle_t *handle, const char *filename, int full,
alpm_siglevel_t level, alpm_pkg_t **pkg)
{
CHECK_HANDLE(handle, return -1);
ASSERT(pkg != NULL, RET_ERR(handle, ALPM_ERR_WRONG_ARGS, -1));
if(_alpm_pkg_validate_internal(handle, filename, NULL, level, NULL) == -1) {
/* pm_errno is set by pkg_validate */
return -1;
}
*pkg = _alpm_pkg_load_internal(handle, filename, full);
if(*pkg == NULL) {
/* pm_errno is set by pkg_load */
return -1;
}
return 0;
}
/* vim: set ts=2 sw=2 noet: */
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