539 lines
12 KiB
C
539 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kevin Fall.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#endif
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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#include <sys/capsicum.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#ifndef NO_UDOM_SUPPORT
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <netdb.h>
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#endif
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#include <capsicum_helpers.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <libcasper.h>
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#include <casper/cap_fileargs.h>
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#include <casper/cap_net.h>
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static int bflag, eflag, lflag, nflag, sflag, tflag, vflag;
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static int rval;
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static const char *filename;
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static fileargs_t *fa;
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static void usage(void) __dead2;
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static void scanfiles(char *argv[], int cooked);
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#ifndef BOOTSTRAP_CAT
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static void cook_cat(FILE *);
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static ssize_t in_kernel_copy(int);
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#endif
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static void raw_cat(int);
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#ifndef NO_UDOM_SUPPORT
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static cap_channel_t *capnet;
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static int udom_open(const char *path, int flags);
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#endif
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/*
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* Memory strategy threshold, in pages: if physmem is larger than this,
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* use a large buffer.
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*/
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#define PHYSPAGES_THRESHOLD (32 * 1024)
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/* Maximum buffer size in bytes - do not allow it to grow larger than this. */
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#define BUFSIZE_MAX (2 * 1024 * 1024)
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/*
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* Small (default) buffer size in bytes. It's inefficient for this to be
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* smaller than MAXPHYS.
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*/
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#define BUFSIZE_SMALL (MAXPHYS)
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/*
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* For the bootstrapped cat binary (needed for locked appending to METALOG), we
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* disable all flags except -l and -u to avoid non-portable function calls.
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* In the future we may instead want to write a small portable bootstrap tool
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* that locks the output file before writing to it. However, for now
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* bootstrapping cat without multibyte support is the simpler solution.
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*/
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#ifdef BOOTSTRAP_CAT
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#define SUPPORTED_FLAGS "lu"
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#else
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#define SUPPORTED_FLAGS "belnstuv"
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#endif
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#ifndef NO_UDOM_SUPPORT
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static void
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init_casper_net(cap_channel_t *casper)
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{
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cap_net_limit_t *limit;
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int familylimit;
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capnet = cap_service_open(casper, "system.net");
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if (capnet == NULL)
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err(EXIT_FAILURE, "unable to create network service");
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limit = cap_net_limit_init(capnet, CAPNET_NAME2ADDR |
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CAPNET_CONNECTDNS);
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if (limit == NULL)
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err(EXIT_FAILURE, "unable to create limits");
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familylimit = AF_LOCAL;
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cap_net_limit_name2addr_family(limit, &familylimit, 1);
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if (cap_net_limit(limit) < 0)
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err(EXIT_FAILURE, "unable to apply limits");
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}
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#endif
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static void
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init_casper(int argc, char *argv[])
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{
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cap_channel_t *casper;
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cap_rights_t rights;
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casper = cap_init();
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if (casper == NULL)
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err(EXIT_FAILURE, "unable to create Casper");
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fa = fileargs_cinit(casper, argc, argv, O_RDONLY, 0,
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cap_rights_init(&rights, CAP_READ | CAP_FSTAT | CAP_FCNTL),
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FA_OPEN | FA_REALPATH);
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if (fa == NULL)
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err(EXIT_FAILURE, "unable to create fileargs");
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#ifndef NO_UDOM_SUPPORT
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init_casper_net(casper);
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#endif
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cap_close(casper);
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}
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int
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main(int argc, char *argv[])
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{
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int ch;
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struct flock stdout_lock;
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setlocale(LC_CTYPE, "");
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while ((ch = getopt(argc, argv, SUPPORTED_FLAGS)) != -1)
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switch (ch) {
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case 'b':
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bflag = nflag = 1; /* -b implies -n */
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break;
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case 'e':
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eflag = vflag = 1; /* -e implies -v */
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break;
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case 'l':
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lflag = 1;
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break;
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case 'n':
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nflag = 1;
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break;
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case 's':
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sflag = 1;
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break;
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case 't':
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tflag = vflag = 1; /* -t implies -v */
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break;
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case 'u':
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setbuf(stdout, NULL);
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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}
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argv += optind;
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argc -= optind;
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if (lflag) {
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stdout_lock.l_len = 0;
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stdout_lock.l_start = 0;
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stdout_lock.l_type = F_WRLCK;
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stdout_lock.l_whence = SEEK_SET;
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if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
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err(EXIT_FAILURE, "stdout");
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}
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init_casper(argc, argv);
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caph_cache_catpages();
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if (caph_enter_casper() < 0)
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err(EXIT_FAILURE, "capsicum");
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if (bflag || eflag || nflag || sflag || tflag || vflag)
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scanfiles(argv, 1);
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else
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scanfiles(argv, 0);
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if (fclose(stdout))
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err(1, "stdout");
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exit(rval);
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/* NOTREACHED */
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: cat [-" SUPPORTED_FLAGS "] [file ...]\n");
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exit(1);
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/* NOTREACHED */
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}
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static void
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scanfiles(char *argv[], int cooked __unused)
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{
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int fd, i;
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char *path;
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#ifndef BOOTSTRAP_CAT
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FILE *fp;
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#endif
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i = 0;
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fd = -1;
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while ((path = argv[i]) != NULL || i == 0) {
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if (path == NULL || strcmp(path, "-") == 0) {
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filename = "stdin";
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fd = STDIN_FILENO;
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} else {
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filename = path;
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fd = fileargs_open(fa, path);
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#ifndef NO_UDOM_SUPPORT
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if (fd < 0 && errno == EOPNOTSUPP)
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fd = udom_open(path, O_RDONLY);
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#endif
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}
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if (fd < 0) {
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warn("%s", path);
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rval = 1;
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#ifndef BOOTSTRAP_CAT
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} else if (cooked) {
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if (fd == STDIN_FILENO)
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cook_cat(stdin);
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else {
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fp = fdopen(fd, "r");
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cook_cat(fp);
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fclose(fp);
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}
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#endif
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} else {
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#ifndef BOOTSTRAP_CAT
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if (in_kernel_copy(fd) == -1) {
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if (errno == EINVAL || errno == EBADF)
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raw_cat(fd);
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else
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err(1, "stdout");
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}
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#else
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raw_cat(fd);
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#endif
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if (fd != STDIN_FILENO)
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close(fd);
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}
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if (path == NULL)
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break;
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++i;
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}
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}
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#ifndef BOOTSTRAP_CAT
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static void
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cook_cat(FILE *fp)
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{
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int ch, gobble, line, prev;
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wint_t wch;
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/* Reset EOF condition on stdin. */
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if (fp == stdin && feof(stdin))
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clearerr(stdin);
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line = gobble = 0;
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for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
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if (prev == '\n') {
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if (sflag) {
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if (ch == '\n') {
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if (gobble)
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continue;
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gobble = 1;
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} else
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gobble = 0;
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}
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if (nflag) {
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if (!bflag || ch != '\n') {
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(void)fprintf(stdout, "%6d\t", ++line);
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if (ferror(stdout))
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break;
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} else if (eflag) {
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(void)fprintf(stdout, "%6s\t", "");
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if (ferror(stdout))
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break;
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}
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}
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}
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if (ch == '\n') {
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if (eflag && putchar('$') == EOF)
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break;
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} else if (ch == '\t') {
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if (tflag) {
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if (putchar('^') == EOF || putchar('I') == EOF)
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break;
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continue;
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}
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} else if (vflag) {
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(void)ungetc(ch, fp);
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/*
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* Our getwc(3) doesn't change file position
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* on error.
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*/
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if ((wch = getwc(fp)) == WEOF) {
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if (ferror(fp) && errno == EILSEQ) {
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clearerr(fp);
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/* Resync attempt. */
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memset(&fp->_mbstate, 0, sizeof(mbstate_t));
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if ((ch = getc(fp)) == EOF)
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break;
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wch = ch;
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goto ilseq;
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} else
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break;
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}
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if (!iswascii(wch) && !iswprint(wch)) {
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ilseq:
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if (putchar('M') == EOF || putchar('-') == EOF)
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break;
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wch = toascii(wch);
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}
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if (iswcntrl(wch)) {
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ch = toascii(wch);
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ch = (ch == '\177') ? '?' : (ch | 0100);
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if (putchar('^') == EOF || putchar(ch) == EOF)
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break;
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continue;
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}
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if (putwchar(wch) == WEOF)
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break;
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ch = -1;
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continue;
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}
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if (putchar(ch) == EOF)
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break;
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}
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if (ferror(fp)) {
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warn("%s", filename);
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rval = 1;
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clearerr(fp);
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}
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if (ferror(stdout))
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err(1, "stdout");
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}
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static ssize_t
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in_kernel_copy(int rfd)
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{
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int wfd;
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ssize_t ret;
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wfd = fileno(stdout);
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ret = 1;
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while (ret > 0)
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ret = copy_file_range(rfd, NULL, wfd, NULL, SSIZE_MAX, 0);
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return (ret);
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}
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#endif /* BOOTSTRAP_CAT */
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static void
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raw_cat(int rfd)
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{
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long pagesize;
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int off, wfd;
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ssize_t nr, nw;
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static size_t bsize;
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static char *buf = NULL;
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struct stat sbuf;
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wfd = fileno(stdout);
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if (buf == NULL) {
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if (fstat(wfd, &sbuf))
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err(1, "stdout");
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if (S_ISREG(sbuf.st_mode)) {
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/* If there's plenty of RAM, use a large copy buffer */
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if (sysconf(_SC_PHYS_PAGES) > PHYSPAGES_THRESHOLD)
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bsize = MIN(BUFSIZE_MAX, MAXPHYS * 8);
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else
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bsize = BUFSIZE_SMALL;
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} else {
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bsize = sbuf.st_blksize;
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pagesize = sysconf(_SC_PAGESIZE);
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if (pagesize > 0)
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bsize = MAX(bsize, (size_t)pagesize);
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}
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if ((buf = malloc(bsize)) == NULL)
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err(1, "malloc() failure of IO buffer");
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}
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while ((nr = read(rfd, buf, bsize)) > 0)
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for (off = 0; nr; nr -= nw, off += nw)
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if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
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err(1, "stdout");
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if (nr < 0) {
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warn("%s", filename);
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rval = 1;
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}
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}
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#ifndef NO_UDOM_SUPPORT
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static int
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udom_open(const char *path, int flags)
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{
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struct addrinfo hints, *res, *res0;
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char rpath[PATH_MAX];
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int error, fd, serrno;
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cap_rights_t rights;
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/*
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* Construct the unix domain socket address and attempt to connect.
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*/
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bzero(&hints, sizeof(hints));
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hints.ai_family = AF_LOCAL;
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if (fileargs_realpath(fa, path, rpath) == NULL)
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return (-1);
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error = cap_getaddrinfo(capnet, rpath, NULL, &hints, &res0);
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if (error) {
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warn("%s", gai_strerror(error));
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errno = EINVAL;
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return (-1);
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}
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cap_rights_init(&rights, CAP_CONNECT, CAP_READ, CAP_WRITE,
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CAP_SHUTDOWN, CAP_FSTAT, CAP_FCNTL);
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/* Default error if something goes wrong. */
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serrno = EINVAL;
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for (res = res0; res != NULL; res = res->ai_next) {
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fd = socket(res->ai_family, res->ai_socktype,
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res->ai_protocol);
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if (fd < 0) {
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serrno = errno;
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freeaddrinfo(res0);
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errno = serrno;
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return (-1);
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}
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if (caph_rights_limit(fd, &rights) < 0) {
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serrno = errno;
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close(fd);
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freeaddrinfo(res0);
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errno = serrno;
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return (-1);
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}
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error = cap_connect(capnet, fd, res->ai_addr, res->ai_addrlen);
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if (error == 0)
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break;
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else {
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serrno = errno;
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close(fd);
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}
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}
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freeaddrinfo(res0);
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if (res == NULL) {
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errno = serrno;
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return (-1);
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}
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/*
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* handle the open flags by shutting down appropriate directions
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*/
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switch (flags & O_ACCMODE) {
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case O_RDONLY:
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cap_rights_clear(&rights, CAP_WRITE);
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if (shutdown(fd, SHUT_WR) == -1)
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warn(NULL);
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break;
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case O_WRONLY:
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cap_rights_clear(&rights, CAP_READ);
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if (shutdown(fd, SHUT_RD) == -1)
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warn(NULL);
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break;
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default:
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break;
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}
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cap_rights_clear(&rights, CAP_CONNECT, CAP_SHUTDOWN);
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if (caph_rights_limit(fd, &rights) < 0) {
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serrno = errno;
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close(fd);
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errno = serrno;
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return (-1);
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}
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return (fd);
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}
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#endif
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