archive.c

/*-
 * Copyright (c) 2008-2014 Juan Romero Pardines.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
 
#include <archive.h>
#include <archive_entry.h>
 
#include "fetch.h"
#include "xbps_api_impl.h"
 
int HIDDEN
xbps_archive_errno(struct archive *ar)
{
        int err = archive_errno(ar);
        return err == -1 ? EINVAL : err;
}
 
char HIDDEN *
xbps_archive_get_file(struct archive *ar, struct archive_entry *entry)
{
        int64_t entry_size;
        size_t used = 0;
        size_t len;
        char *buf;
        int r;
 
        assert(ar != NULL);
        assert(entry != NULL);
 
        entry_size = archive_entry_size(entry);
        if (entry_size < 0 || (uint64_t)entry_size >= SIZE_MAX) {
                errno = EOVERFLOW;
                return NULL;
        }
        len = entry_size;
 
        buf = malloc(len + 1);
        if (!buf) {
                xbps_error_oom();
                errno = ENOMEM;
                return NULL;
        }
 
        for (;;) {
                ssize_t rd = archive_read_data(ar, buf + used, len - used);
                if (rd == ARCHIVE_FATAL || rd == ARCHIVE_WARN) {
                        const char *pname = archive_entry_pathname(entry);
                        if (!pname)
                                xbps_unreachable();
                        r = -xbps_archive_errno(ar);
                        xbps_error_printf(
                            "failed to read archive entry: %s: %s\n",
                            pname, archive_error_string(ar));
                        goto err;
                } else if (rd == ARCHIVE_RETRY) {
                        continue;
                }
                used += rd;
                if (rd == 0 || used == len)
                        break;
        }
        if (used < len) {
                const char *pname = archive_entry_pathname(entry);
                if (!pname)
                        xbps_unreachable();
                r = -EIO;
                xbps_error_printf(
                    "failed to read archive entry: %s: could not read enough "
                    "data: %s\n", pname, strerror(-r));
                goto err;
        }
 
        buf[len] = '\0';
        return buf;
err:
        free(buf);
        errno = -r;
        return NULL;
}
 
xbps_dictionary_t HIDDEN
xbps_archive_get_dictionary(struct archive *ar, struct archive_entry *entry)
{
        xbps_dictionary_t d = NULL;
        char *buf;
 
        if ((buf = xbps_archive_get_file(ar, entry)) == NULL)
                return NULL;
 
        /* If blob is already a dictionary we are done */
        d = xbps_dictionary_internalize(buf);
        free(buf);
        return d;
}
 
int
xbps_archive_append_buf(struct archive *ar, const void *buf, const size_t buflen,
        const char *fname, const mode_t mode, const char *uname, const char *gname)
{
        struct archive_entry *entry;
 
        assert(ar);
        assert(buf);
        assert(fname);
        assert(uname);
        assert(gname);
 
        entry = archive_entry_new();
        if (!entry)
                return -xbps_archive_errno(ar);
 
        archive_entry_set_filetype(entry, AE_IFREG);
        archive_entry_set_perm(entry, mode);
        archive_entry_set_uname(entry, uname);
        archive_entry_set_gname(entry, gname);
        archive_entry_set_pathname(entry, fname);
        archive_entry_set_size(entry, buflen);
 
        if (archive_write_header(ar, entry) != ARCHIVE_OK) {
                archive_entry_free(entry);
                return -xbps_archive_errno(ar);
        }
        if (archive_write_data(ar, buf, buflen) != ARCHIVE_OK) {
                archive_entry_free(entry);
                return -xbps_archive_errno(ar);
        }
        if (archive_write_finish_entry(ar) != ARCHIVE_OK) {
                archive_entry_free(entry);
                return -xbps_archive_errno(ar);
        }
        archive_entry_free(entry);
 
        return 0;
}
 
struct fetch_archive {
        struct url *url;
        struct fetchIO *fetch;
        char buffer[32768];
};
 
static int
fetch_archive_open(struct archive *a, void *client_data)
{
        struct fetch_archive *f = client_data;
 
        f->fetch = fetchGet(f->url, NULL);
        if (!f->fetch) {
                const char *errstr = xbps_fetch_error_string();
                int err;
                switch (fetchLastErrCode) {
                case FETCH_UNAVAIL:
                        err = ENOENT;
                        break;
                default:
                        err = EIO;
                        break;
                }
                archive_set_error(a, err, "%s", errstr ? errstr : "unknown fetch error");
                return ARCHIVE_FATAL;
        }
 
        return ARCHIVE_OK;
}
 
static ssize_t
fetch_archive_read(struct archive *a UNUSED, void *client_data, const void **buf)
{
        struct fetch_archive *f = client_data;
        ssize_t rd;
 
        *buf = f->buffer;
        rd = fetchIO_read(f->fetch, f->buffer, sizeof(f->buffer));
        if (rd == -1) {
                const char *errstr = xbps_fetch_error_string();
                archive_set_error(a, EIO, "%s", errstr ? errstr : "unknown fetch error");
                return -1;
        }
        return rd;
}
 
static int
fetch_archive_close(struct archive *a UNUSED, void *client_data)
{
        struct fetch_archive *f = client_data;
 
        if (f->fetch != NULL)
                fetchIO_close(f->fetch);
        fetchFreeURL(f->url);
        free(f);
 
        return 0;
}
 
struct archive HIDDEN *
xbps_archive_read_new(void)
{
        struct archive *ar = archive_read_new();
        if (!ar)
                return NULL;
        archive_read_support_filter_gzip(ar);
        archive_read_support_filter_bzip2(ar);
        archive_read_support_filter_xz(ar);
        archive_read_support_filter_lz4(ar);
        archive_read_support_filter_zstd(ar);
        archive_read_support_format_tar(ar);
        return ar;
}
 
int HIDDEN
xbps_archive_read_open(struct archive *ar, const char *filename)
{
        int r = archive_read_open_filename(ar, filename, 4096);
        if (r == ARCHIVE_FATAL)
                return -xbps_archive_errno(ar);
        return 0;
}
 
int HIDDEN
xbps_archive_read_open_remote(struct archive *ar, const char *url)
{
        struct url *furl;
        struct fetch_archive *f;
        int r;
 
        furl = fetchParseURL(url);
        if (!furl)
                return -EINVAL;
 
        f = calloc(1, sizeof(*f));
        if (!f) {
                r = -errno;
                fetchFreeURL(furl);
                return r;
        }
        f->url = furl;
 
        r = archive_read_open(ar, f, fetch_archive_open, fetch_archive_read,
            fetch_archive_close);
        if (r == ARCHIVE_FATAL) {
                return -xbps_archive_errno(ar);
        }
 
        return 0;
}