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458 lines
14 KiB
458 lines
14 KiB
/*-
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* Copyright (c) 2007 Joerg Sonnenberger
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_compression_program.c,v 1.6 2008/12/06 06:45:15 kientzle Exp $");
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#ifdef HAVE_SYS_WAIT_H
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# include <sys/wait.h>
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#endif
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#ifdef HAVE_ERRNO_H
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# include <errno.h>
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#endif
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#ifdef HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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#ifdef HAVE_SIGNAL_H
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# include <signal.h>
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#endif
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include "archive.h"
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#include "archive_private.h"
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#include "archive_read_private.h"
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int
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archive_read_support_compression_program(struct archive *a, const char *cmd)
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{
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return (archive_read_support_compression_program_signature(a, cmd, NULL, 0));
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}
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/* This capability is only available on POSIX systems. */
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#if (!defined(HAVE_PIPE) || !defined(HAVE_FCNTL) || \
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!(defined(HAVE_FORK) || defined(HAVE_VFORK))) && (!defined(_WIN32) || defined(__CYGWIN__))
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/*
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* On non-Posix systems, allow the program to build, but choke if
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* this function is actually invoked.
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*/
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int
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archive_read_support_compression_program_signature(struct archive *_a,
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const char *cmd, const void *signature, size_t signature_len)
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{
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(void)_a; /* UNUSED */
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(void)cmd; /* UNUSED */
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(void)signature; /* UNUSED */
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(void)signature_len; /* UNUSED */
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archive_set_error(_a, -1,
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"External compression programs not supported on this platform");
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return (ARCHIVE_FATAL);
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}
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int
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__archive_read_program(struct archive_read_filter *self, const char *cmd)
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{
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(void)self; /* UNUSED */
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(void)cmd; /* UNUSED */
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archive_set_error(&self->archive->archive, -1,
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"External compression programs not supported on this platform");
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return (ARCHIVE_FATAL);
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}
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#else
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#include "filter_fork.h"
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/*
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* The bidder object stores the command and the signature to watch for.
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* The 'inhibit' entry here is used to ensure that unchecked filters never
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* bid twice in the same pipeline.
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*/
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struct program_bidder {
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char *cmd;
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void *signature;
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size_t signature_len;
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int inhibit;
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};
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static int program_bidder_bid(struct archive_read_filter_bidder *,
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struct archive_read_filter *upstream);
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static int program_bidder_init(struct archive_read_filter *);
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static int program_bidder_free(struct archive_read_filter_bidder *);
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/*
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* The actual filter needs to track input and output data.
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*/
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struct program_filter {
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char *description;
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pid_t child;
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int exit_status;
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int waitpid_return;
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int child_stdin, child_stdout;
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char *out_buf;
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size_t out_buf_len;
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};
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static ssize_t program_filter_read(struct archive_read_filter *,
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const void **);
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static int program_filter_close(struct archive_read_filter *);
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int
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archive_read_support_compression_program_signature(struct archive *_a,
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const char *cmd, const void *signature, size_t signature_len)
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{
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struct archive_read *a = (struct archive_read *)_a;
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struct archive_read_filter_bidder *bidder;
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struct program_bidder *state;
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/*
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* Get a bidder object from the read core.
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*/
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bidder = __archive_read_get_bidder(a);
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if (bidder == NULL)
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return (ARCHIVE_FATAL);
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/*
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* Allocate our private state.
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*/
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state = (struct program_bidder *)calloc(sizeof (*state), 1);
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if (state == NULL)
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return (ARCHIVE_FATAL);
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state->cmd = strdup(cmd);
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if (signature != NULL && signature_len > 0) {
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state->signature_len = signature_len;
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state->signature = malloc(signature_len);
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memcpy(state->signature, signature, signature_len);
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}
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/*
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* Fill in the bidder object.
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*/
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bidder->data = state;
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bidder->bid = program_bidder_bid;
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bidder->init = program_bidder_init;
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bidder->options = NULL;
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bidder->free = program_bidder_free;
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return (ARCHIVE_OK);
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}
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static int
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program_bidder_free(struct archive_read_filter_bidder *self)
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{
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struct program_bidder *state = (struct program_bidder *)self->data;
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free(state->cmd);
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free(state->signature);
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free(self->data);
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return (ARCHIVE_OK);
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}
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/*
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* If we do have a signature, bid only if that matches.
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*
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* If there's no signature, we bid INT_MAX the first time
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* we're called, then never bid again.
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*/
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static int
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program_bidder_bid(struct archive_read_filter_bidder *self,
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struct archive_read_filter *upstream)
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{
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struct program_bidder *state = self->data;
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const char *p;
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/* If we have a signature, use that to match. */
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if (state->signature_len > 0) {
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p = __archive_read_filter_ahead(upstream,
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state->signature_len, NULL);
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if (p == NULL)
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return (0);
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/* No match, so don't bid. */
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if (memcmp(p, state->signature, state->signature_len) != 0)
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return (0);
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return (state->signature_len * 8);
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}
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/* Otherwise, bid once and then never bid again. */
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if (state->inhibit)
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return (0);
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state->inhibit = 1;
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return (INT_MAX);
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}
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/*
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* Shut down the child, return ARCHIVE_OK if it exited normally.
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*
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* Note that the return value is sticky; if we're called again,
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* we won't reap the child again, but we will return the same status
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* (including error message if the child came to a bad end).
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*/
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static int
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child_stop(struct archive_read_filter *self, struct program_filter *state)
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{
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/* Close our side of the I/O with the child. */
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if (state->child_stdin != -1) {
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close(state->child_stdin);
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state->child_stdin = -1;
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}
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if (state->child_stdout != -1) {
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close(state->child_stdout);
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state->child_stdout = -1;
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}
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if (state->child != 0) {
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/* Reap the child. */
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do {
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state->waitpid_return
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= waitpid(state->child, &state->exit_status, 0);
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} while (state->waitpid_return == -1 && errno == EINTR);
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state->child = 0;
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}
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if (state->waitpid_return < 0) {
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/* waitpid() failed? This is ugly. */
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archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
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"Child process exited badly");
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return (ARCHIVE_WARN);
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}
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if (WIFSIGNALED(state->exit_status)) {
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#ifdef SIGPIPE
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/* If the child died because we stopped reading before
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* it was done, that's okay. Some archive formats
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* have padding at the end that we routinely ignore. */
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/* The alternative to this would be to add a step
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* before close(child_stdout) above to read from the
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* child until the child has no more to write. */
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if (WTERMSIG(state->exit_status) == SIGPIPE)
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return (ARCHIVE_OK);
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#endif
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archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
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"Child process exited with signal %d",
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WTERMSIG(state->exit_status));
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return (ARCHIVE_WARN);
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}
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if (WIFEXITED(state->exit_status)) {
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if (WEXITSTATUS(state->exit_status) == 0)
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return (ARCHIVE_OK);
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Child process exited with status %d",
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WEXITSTATUS(state->exit_status));
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return (ARCHIVE_WARN);
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}
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return (ARCHIVE_WARN);
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}
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/*
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* Use select() to decide whether the child is ready for read or write.
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*/
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static ssize_t
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child_read(struct archive_read_filter *self, char *buf, size_t buf_len)
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{
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struct program_filter *state = self->data;
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ssize_t ret, requested, avail;
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const char *p;
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requested = buf_len > SSIZE_MAX ? SSIZE_MAX : buf_len;
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for (;;) {
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do {
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ret = read(state->child_stdout, buf, requested);
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} while (ret == -1 && errno == EINTR);
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if (ret > 0)
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return (ret);
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if (ret == 0 || (ret == -1 && errno == EPIPE))
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/* Child has closed its output; reap the child
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* and return the status. */
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return (child_stop(self, state));
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if (ret == -1 && errno != EAGAIN)
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return (-1);
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if (state->child_stdin == -1) {
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/* Block until child has some I/O ready. */
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__archive_check_child(state->child_stdin,
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state->child_stdout);
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continue;
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}
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/* Get some more data from upstream. */
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p = __archive_read_filter_ahead(self->upstream, 1, &avail);
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if (p == NULL) {
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close(state->child_stdin);
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state->child_stdin = -1;
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fcntl(state->child_stdout, F_SETFL, 0);
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if (avail < 0)
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return (avail);
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continue;
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}
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do {
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ret = write(state->child_stdin, p, avail);
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} while (ret == -1 && errno == EINTR);
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if (ret > 0) {
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/* Consume whatever we managed to write. */
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__archive_read_filter_consume(self->upstream, ret);
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} else if (ret == -1 && errno == EAGAIN) {
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/* Block until child has some I/O ready. */
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__archive_check_child(state->child_stdin,
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state->child_stdout);
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} else {
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/* Write failed. */
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close(state->child_stdin);
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state->child_stdin = -1;
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fcntl(state->child_stdout, F_SETFL, 0);
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/* If it was a bad error, we're done; otherwise
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* it was EPIPE or EOF, and we can still read
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* from the child. */
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if (ret == -1 && errno != EPIPE)
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return (-1);
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}
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}
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}
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int
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__archive_read_program(struct archive_read_filter *self, const char *cmd)
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{
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struct program_filter *state;
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static const size_t out_buf_len = 65536;
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char *out_buf;
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char *description;
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const char *prefix = "Program: ";
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state = (struct program_filter *)calloc(1, sizeof(*state));
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out_buf = (char *)malloc(out_buf_len);
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description = (char *)malloc(strlen(prefix) + strlen(cmd) + 1);
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if (state == NULL || out_buf == NULL || description == NULL) {
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archive_set_error(&self->archive->archive, ENOMEM,
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"Can't allocate input data");
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free(state);
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free(out_buf);
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free(description);
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return (ARCHIVE_FATAL);
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}
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self->code = ARCHIVE_COMPRESSION_PROGRAM;
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state->description = description;
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strcpy(state->description, prefix);
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strcat(state->description, cmd);
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self->name = state->description;
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state->out_buf = out_buf;
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state->out_buf_len = out_buf_len;
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if ((state->child = __archive_create_child(cmd,
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&state->child_stdin, &state->child_stdout)) == -1) {
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free(state->out_buf);
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free(state);
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archive_set_error(&self->archive->archive, EINVAL,
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"Can't initialise filter");
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return (ARCHIVE_FATAL);
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}
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self->data = state;
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self->read = program_filter_read;
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self->skip = NULL;
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self->close = program_filter_close;
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/* XXX Check that we can read at least one byte? */
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return (ARCHIVE_OK);
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}
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static int
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program_bidder_init(struct archive_read_filter *self)
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{
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struct program_bidder *bidder_state;
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bidder_state = (struct program_bidder *)self->bidder->data;
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return (__archive_read_program(self, bidder_state->cmd));
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}
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static ssize_t
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program_filter_read(struct archive_read_filter *self, const void **buff)
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{
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struct program_filter *state;
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ssize_t bytes;
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size_t total;
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char *p;
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state = (struct program_filter *)self->data;
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total = 0;
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p = state->out_buf;
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while (state->child_stdout != -1 && total < state->out_buf_len) {
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bytes = child_read(self, p, state->out_buf_len - total);
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if (bytes < 0)
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/* No recovery is possible if we can no longer
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* read from the child. */
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return (ARCHIVE_FATAL);
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if (bytes == 0)
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/* We got EOF from the child. */
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break;
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total += bytes;
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p += bytes;
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}
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*buff = state->out_buf;
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return (total);
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}
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static int
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program_filter_close(struct archive_read_filter *self)
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{
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struct program_filter *state;
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int e;
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state = (struct program_filter *)self->data;
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e = child_stop(self, state);
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/* Release our private data. */
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free(state->out_buf);
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free(state->description);
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free(state);
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return (e);
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}
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#endif /* !defined(HAVE_PIPE) || !defined(HAVE_VFORK) || !defined(HAVE_FCNTL) */
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