4aeb63826e
got it almost correct (we can't use strcmp() here as
current argument isn't guaranteed to be NUL-terminated), but we also
need to check that current argument length is equal to that of eofstr.
PR: 270867
Reviewed by: bapt
Differential Revision: https://reviews.freebsd.org/D39583
817 lines
18 KiB
C
817 lines
18 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 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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* John B. Roll Jr.
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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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* $xMach: xargs.c,v 1.6 2002/02/23 05:27:47 tim Exp $
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*/
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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1990, 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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#ifndef lint
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static char sccsid[] = "@(#)xargs.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/limits.h>
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#include <sys/resource.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 <getopt.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <paths.h>
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#include <regex.h>
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#include <stdbool.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 "pathnames.h"
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static void parse_input(int, char *[]);
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static void prerun(int, char *[]);
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static int prompt(void);
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static void run(char **);
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static void usage(void);
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bool strnsubst(char **, const char *, const char *, size_t);
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static pid_t xwait(int block, int *status);
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static void xexit(const char *, const int);
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static void waitchildren(const char *, int);
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static void pids_init(void);
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static int pids_empty(void);
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static int pids_full(void);
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static void pids_add(pid_t pid);
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static int pids_remove(pid_t pid);
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static int findslot(pid_t pid);
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static int findfreeslot(void);
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static void clearslot(int slot);
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static char echo[] = _PATH_ECHO;
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static char **av, **bxp, **ep, **endxp, **xp;
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static char *argp, *bbp, *ebp, *inpline, *p, *replstr;
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static const char *eofstr;
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static long eoflen;
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static int count, insingle, indouble, oflag, pflag, tflag, Rflag, rval, zflag;
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static int cnt, Iflag, jfound, Lflag, Sflag, wasquoted, xflag;
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static int curprocs, maxprocs;
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static pid_t *childpids;
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static volatile int childerr;
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extern char **environ;
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static const char *optstr = "+0E:I:J:L:n:oP:pR:S:s:rtx";
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static const struct option long_options[] =
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{
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{"exit", no_argument, NULL, 'x'},
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{"interactive", no_argument, NULL, 'p'},
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{"max-args", required_argument, NULL, 'n'},
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{"max-chars", required_argument, NULL, 's'},
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{"max-procs", required_argument, NULL, 'P'},
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{"no-run-if-empty", no_argument, NULL, 'r'},
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{"null", no_argument, NULL, '0'},
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{"verbose", no_argument, NULL, 't'},
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{NULL, no_argument, NULL, 0},
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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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long arg_max;
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int ch, Jflag, nargs, nflag, nline;
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size_t linelen;
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struct rlimit rl;
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char *endptr;
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const char *errstr;
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inpline = replstr = NULL;
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ep = environ;
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eofstr = "";
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eoflen = 0;
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Jflag = nflag = 0;
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(void)setlocale(LC_ALL, "");
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/*
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* POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that
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* caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given
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* that the smallest argument is 2 bytes in length, this means that
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* the number of arguments is limited to:
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*
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* (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2.
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*
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* We arbitrarily limit the number of arguments to 5000. This is
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* allowed by POSIX.2 as long as the resulting minimum exec line is
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* at least LINE_MAX. Realloc'ing as necessary is possible, but
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* probably not worthwhile.
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*/
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nargs = 5000;
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if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
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errx(1, "sysconf(_SC_ARG_MAX) failed");
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nline = arg_max - 4 * 1024;
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while (*ep != NULL) {
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/* 1 byte for each '\0' */
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nline -= strlen(*ep++) + 1 + sizeof(*ep);
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}
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maxprocs = 1;
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while ((ch = getopt_long(argc, argv, optstr, long_options, NULL)) != -1)
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switch (ch) {
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case 'E':
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eofstr = optarg;
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eoflen = strlen(eofstr);
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break;
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case 'I':
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Jflag = 0;
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Iflag = 1;
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Lflag = 1;
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replstr = optarg;
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break;
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case 'J':
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Iflag = 0;
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Jflag = 1;
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replstr = optarg;
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break;
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case 'L':
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Lflag = strtonum(optarg, 0, INT_MAX, &errstr);
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if (errstr)
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errx(1, "-L %s: %s", optarg, errstr);
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break;
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case 'n':
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nflag = 1;
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nargs = strtonum(optarg, 1, INT_MAX, &errstr);
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if (errstr)
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errx(1, "-n %s: %s", optarg, errstr);
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break;
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case 'o':
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oflag = 1;
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break;
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case 'P':
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maxprocs = strtonum(optarg, 0, INT_MAX, &errstr);
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if (errstr)
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errx(1, "-P %s: %s", optarg, errstr);
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if (getrlimit(RLIMIT_NPROC, &rl) != 0)
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errx(1, "getrlimit failed");
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if (maxprocs == 0 || maxprocs > rl.rlim_cur)
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maxprocs = rl.rlim_cur;
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break;
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case 'p':
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pflag = 1;
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break;
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case 'R':
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Rflag = strtol(optarg, &endptr, 10);
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if (*endptr != '\0')
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errx(1, "replacements must be a number");
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break;
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case 'r':
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/* GNU compatibility */
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break;
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case 'S':
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Sflag = strtoul(optarg, &endptr, 10);
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if (*endptr != '\0')
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errx(1, "replsize must be a number");
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break;
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case 's':
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nline = strtonum(optarg, 0, INT_MAX, &errstr);
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if (errstr)
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errx(1, "-s %s: %s", optarg, errstr);
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break;
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case 't':
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tflag = 1;
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break;
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case 'x':
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xflag = 1;
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break;
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case '0':
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zflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!Iflag && Rflag)
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usage();
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if (!Iflag && Sflag)
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usage();
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if (Iflag && !Rflag)
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Rflag = 5;
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if (Iflag && !Sflag)
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Sflag = 255;
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if (xflag && !nflag)
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usage();
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if (Iflag || Lflag)
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xflag = 1;
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if (replstr != NULL && *replstr == '\0')
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errx(1, "replstr may not be empty");
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pids_init();
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/*
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* Allocate pointers for the utility name, the utility arguments,
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* the maximum arguments to be read from stdin and the trailing
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* NULL.
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*/
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linelen = 1 + argc + nargs + 1;
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if ((av = bxp = malloc(linelen * sizeof(char *))) == NULL)
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errx(1, "malloc failed");
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/*
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* Use the user's name for the utility as argv[0], just like the
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* shell. Echo is the default. Set up pointers for the user's
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* arguments.
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*/
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if (*argv == NULL)
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cnt = strlen(*bxp++ = echo);
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else {
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do {
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if (Jflag && strcmp(*argv, replstr) == 0) {
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char **avj;
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jfound = 1;
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argv++;
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for (avj = argv; *avj; avj++)
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cnt += strlen(*avj) + 1;
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break;
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}
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cnt += strlen(*bxp++ = *argv) + 1;
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} while (*++argv != NULL);
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}
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/*
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* Set up begin/end/traversing pointers into the array. The -n
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* count doesn't include the trailing NULL pointer, so the malloc
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* added in an extra slot.
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*/
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endxp = (xp = bxp) + nargs;
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/*
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* Allocate buffer space for the arguments read from stdin and the
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* trailing NULL. Buffer space is defined as the default or specified
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* space, minus the length of the utility name and arguments. Set up
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* begin/end/traversing pointers into the array. The -s count does
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* include the trailing NULL, so the malloc didn't add in an extra
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* slot.
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*/
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nline -= cnt;
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if (nline <= 0)
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errx(1, "insufficient space for command");
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if ((bbp = malloc((size_t)(nline + 1))) == NULL)
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errx(1, "malloc failed");
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ebp = (argp = p = bbp) + nline - 1;
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for (;;)
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parse_input(argc, argv);
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}
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static void
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parse_input(int argc, char *argv[])
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{
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int ch, foundeof;
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char **avj;
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foundeof = 0;
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switch (ch = getchar()) {
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case EOF:
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/* No arguments since last exec. */
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if (p == bbp) {
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waitchildren(*av, 1);
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exit(rval);
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}
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goto arg1;
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case ' ':
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case '\t':
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/* Quotes escape tabs and spaces. */
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if (insingle || indouble || zflag)
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goto addch;
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goto arg2;
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case '\0':
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if (zflag) {
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/*
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* Increment 'count', so that nulls will be treated
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* as end-of-line, as well as end-of-argument. This
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* is needed so -0 works properly with -I and -L.
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*/
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count++;
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goto arg2;
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}
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goto addch;
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case '\n':
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if (zflag)
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goto addch;
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count++; /* Indicate end-of-line (used by -L) */
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/* Quotes do not escape newlines. */
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arg1: if (insingle || indouble) {
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warnx("unterminated quote");
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xexit(*av, 1);
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}
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arg2:
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foundeof = eoflen != 0 && p - argp == eoflen &&
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strncmp(argp, eofstr, eoflen) == 0;
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/* Do not make empty args unless they are quoted */
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if ((argp != p || wasquoted) && !foundeof) {
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*p++ = '\0';
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*xp++ = argp;
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if (Iflag) {
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size_t curlen;
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|
if (inpline == NULL)
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curlen = 0;
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else {
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/*
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|
* If this string is not zero
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|
* length, append a space for
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* separation before the next
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* argument.
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*/
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|
if ((curlen = strlen(inpline)))
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strcat(inpline, " ");
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}
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curlen++;
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/*
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|
* Allocate enough to hold what we will
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* be holding in a second, and to append
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* a space next time through, if we have
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* to.
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*/
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inpline = realloc(inpline, curlen + 2 +
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strlen(argp));
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if (inpline == NULL) {
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warnx("realloc failed");
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xexit(*av, 1);
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}
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if (curlen == 1)
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strcpy(inpline, argp);
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else
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strcat(inpline, argp);
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}
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}
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/*
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* If max'd out on args or buffer, or reached EOF,
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* run the command. If xflag and max'd out on buffer
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|
* but not on args, object. Having reached the limit
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* of input lines, as specified by -L is the same as
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* maxing out on arguments.
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*/
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if (xp == endxp || p > ebp || ch == EOF ||
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(Lflag <= count && xflag) || foundeof) {
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|
if (xflag && xp != endxp && p > ebp) {
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warnx("insufficient space for arguments");
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xexit(*av, 1);
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|
}
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|
if (jfound) {
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for (avj = argv; *avj; avj++)
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*xp++ = *avj;
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}
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|
prerun(argc, av);
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|
if (ch == EOF || foundeof) {
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waitchildren(*av, 1);
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exit(rval);
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|
}
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p = bbp;
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xp = bxp;
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count = 0;
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}
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argp = p;
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wasquoted = 0;
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break;
|
|
case '\'':
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|
if (indouble || zflag)
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|
goto addch;
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|
insingle = !insingle;
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|
wasquoted = 1;
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|
break;
|
|
case '"':
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|
if (insingle || zflag)
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|
goto addch;
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|
indouble = !indouble;
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|
wasquoted = 1;
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|
break;
|
|
case '\\':
|
|
if (zflag)
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|
goto addch;
|
|
/* Backslash escapes anything, is escaped by quotes. */
|
|
if (!insingle && !indouble && (ch = getchar()) == EOF) {
|
|
warnx("backslash at EOF");
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|
xexit(*av, 1);
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|
}
|
|
/* FALLTHROUGH */
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|
default:
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|
addch: if (p < ebp) {
|
|
*p++ = ch;
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|
break;
|
|
}
|
|
|
|
/* If only one argument, not enough buffer space. */
|
|
if (bxp == xp) {
|
|
warnx("insufficient space for argument");
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|
xexit(*av, 1);
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|
}
|
|
/* Didn't hit argument limit, so if xflag object. */
|
|
if (xflag) {
|
|
warnx("insufficient space for arguments");
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|
xexit(*av, 1);
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|
}
|
|
|
|
if (jfound) {
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|
for (avj = argv; *avj; avj++)
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|
*xp++ = *avj;
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|
}
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|
prerun(argc, av);
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|
xp = bxp;
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|
cnt = ebp - argp;
|
|
memcpy(bbp, argp, (size_t)cnt);
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|
p = (argp = bbp) + cnt;
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|
*p++ = ch;
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|
break;
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|
}
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}
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|
|
/*
|
|
* Do things necessary before run()'ing, such as -I substitution,
|
|
* and then call run().
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|
*/
|
|
static void
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|
prerun(int argc, char *argv[])
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|
{
|
|
char **tmp, **tmp2, **avj;
|
|
int repls;
|
|
|
|
repls = Rflag;
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|
|
|
if (argc == 0 || repls == 0) {
|
|
*xp = NULL;
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|
run(argv);
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|
return;
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|
}
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|
|
avj = argv;
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|
|
/*
|
|
* Allocate memory to hold the argument list, and
|
|
* a NULL at the tail.
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*/
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tmp = malloc((argc + 1) * sizeof(char *));
|
|
if (tmp == NULL) {
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|
warnx("malloc failed");
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|
xexit(*argv, 1);
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|
}
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|
tmp2 = tmp;
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|
|
/*
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|
* Save the first argument and iterate over it, we
|
|
* cannot do strnsubst() to it.
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|
*/
|
|
if ((*tmp++ = strdup(*avj++)) == NULL) {
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|
warnx("strdup failed");
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|
xexit(*argv, 1);
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|
}
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|
|
/*
|
|
* For each argument to utility, if we have not used up
|
|
* the number of replacements we are allowed to do, and
|
|
* if the argument contains at least one occurrence of
|
|
* replstr, call strnsubst(), else just save the string.
|
|
* Iterations over elements of avj and tmp are done
|
|
* where appropriate.
|
|
*/
|
|
while (--argc) {
|
|
*tmp = *avj++;
|
|
if (repls && strstr(*tmp, replstr) != NULL) {
|
|
if (strnsubst(tmp++, replstr, inpline, (size_t)Sflag)) {
|
|
warnx("comamnd line cannot be assembled, too long");
|
|
xexit(*argv, 1);
|
|
}
|
|
if (repls > 0)
|
|
repls--;
|
|
} else {
|
|
if ((*tmp = strdup(*tmp)) == NULL) {
|
|
warnx("strdup failed");
|
|
xexit(*argv, 1);
|
|
}
|
|
tmp++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Run it.
|
|
*/
|
|
*tmp = NULL;
|
|
run(tmp2);
|
|
|
|
/*
|
|
* Walk from the tail to the head, free along the way.
|
|
*/
|
|
for (; tmp2 != tmp; tmp--)
|
|
free(*tmp);
|
|
/*
|
|
* Now free the list itself.
|
|
*/
|
|
free(tmp2);
|
|
|
|
/*
|
|
* Free the input line buffer, if we have one.
|
|
*/
|
|
if (inpline != NULL) {
|
|
free(inpline);
|
|
inpline = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
run(char **argv)
|
|
{
|
|
pid_t pid;
|
|
int fd;
|
|
char **avec;
|
|
|
|
/*
|
|
* If the user wants to be notified of each command before it is
|
|
* executed, notify them. If they want the notification to be
|
|
* followed by a prompt, then prompt them.
|
|
*/
|
|
if (tflag || pflag) {
|
|
(void)fprintf(stderr, "%s", *argv);
|
|
for (avec = argv + 1; *avec != NULL; ++avec)
|
|
(void)fprintf(stderr, " %s", *avec);
|
|
/*
|
|
* If the user has asked to be prompted, do so.
|
|
*/
|
|
if (pflag)
|
|
/*
|
|
* If they asked not to exec, return without execution
|
|
* but if they asked to, go to the execution. If we
|
|
* could not open their tty, break the switch and drop
|
|
* back to -t behaviour.
|
|
*/
|
|
switch (prompt()) {
|
|
case 0:
|
|
return;
|
|
case 1:
|
|
goto exec;
|
|
case 2:
|
|
break;
|
|
}
|
|
(void)fprintf(stderr, "\n");
|
|
(void)fflush(stderr);
|
|
}
|
|
exec:
|
|
childerr = 0;
|
|
switch (pid = vfork()) {
|
|
case -1:
|
|
warn("vfork");
|
|
xexit(*argv, 1);
|
|
case 0:
|
|
if (oflag) {
|
|
if ((fd = open(_PATH_TTY, O_RDONLY)) == -1)
|
|
err(1, "can't open /dev/tty");
|
|
} else {
|
|
fd = open(_PATH_DEVNULL, O_RDONLY);
|
|
}
|
|
if (fd > STDIN_FILENO) {
|
|
if (dup2(fd, STDIN_FILENO) != 0)
|
|
err(1, "can't dup2 to stdin");
|
|
close(fd);
|
|
}
|
|
execvp(argv[0], argv);
|
|
childerr = errno;
|
|
_exit(1);
|
|
}
|
|
pids_add(pid);
|
|
waitchildren(*argv, 0);
|
|
}
|
|
|
|
/*
|
|
* Wait for a tracked child to exit and return its pid and exit status.
|
|
*
|
|
* Ignores (discards) all untracked child processes.
|
|
* Returns -1 and sets errno to ECHILD if no tracked children exist.
|
|
* If block is set, waits indefinitely for a child process to exit.
|
|
* If block is not set and no children have exited, returns 0 immediately.
|
|
*/
|
|
static pid_t
|
|
xwait(int block, int *status) {
|
|
pid_t pid;
|
|
|
|
if (pids_empty()) {
|
|
errno = ECHILD;
|
|
return (-1);
|
|
}
|
|
|
|
while ((pid = waitpid(-1, status, block ? 0 : WNOHANG)) > 0)
|
|
if (pids_remove(pid))
|
|
break;
|
|
|
|
return (pid);
|
|
}
|
|
|
|
static void
|
|
xexit(const char *name, const int exit_code) {
|
|
waitchildren(name, 1);
|
|
exit(exit_code);
|
|
}
|
|
|
|
static void
|
|
waitchildren(const char *name, int waitall)
|
|
{
|
|
pid_t pid;
|
|
int status;
|
|
int cause_exit = 0;
|
|
|
|
while ((pid = xwait(waitall || pids_full(), &status)) > 0) {
|
|
/*
|
|
* If we couldn't invoke the utility or if utility exited
|
|
* because of a signal or with a value of 255, warn (per
|
|
* POSIX), and then wait until all other children have
|
|
* exited before exiting 1-125. POSIX requires us to stop
|
|
* reading if child exits because of a signal or with 255,
|
|
* but it does not require us to exit immediately; waiting
|
|
* is preferable to orphaning.
|
|
*/
|
|
if (childerr != 0 && cause_exit == 0) {
|
|
errno = childerr;
|
|
waitall = 1;
|
|
cause_exit = errno == ENOENT ? 127 : 126;
|
|
warn("%s", name);
|
|
} else if (WIFSIGNALED(status)) {
|
|
waitall = cause_exit = 1;
|
|
warnx("%s: terminated with signal %d; aborting",
|
|
name, WTERMSIG(status));
|
|
} else if (WEXITSTATUS(status) == 255) {
|
|
waitall = cause_exit = 1;
|
|
warnx("%s: exited with status 255; aborting", name);
|
|
} else if (WEXITSTATUS(status))
|
|
rval = 1;
|
|
}
|
|
|
|
if (cause_exit)
|
|
exit(cause_exit);
|
|
if (pid == -1 && errno != ECHILD)
|
|
err(1, "waitpid");
|
|
}
|
|
|
|
#define NOPID (0)
|
|
|
|
static void
|
|
pids_init(void)
|
|
{
|
|
int i;
|
|
|
|
if ((childpids = malloc(maxprocs * sizeof(*childpids))) == NULL)
|
|
errx(1, "malloc failed");
|
|
|
|
for (i = 0; i < maxprocs; i++)
|
|
clearslot(i);
|
|
}
|
|
|
|
static int
|
|
pids_empty(void)
|
|
{
|
|
|
|
return (curprocs == 0);
|
|
}
|
|
|
|
static int
|
|
pids_full(void)
|
|
{
|
|
|
|
return (curprocs >= maxprocs);
|
|
}
|
|
|
|
static void
|
|
pids_add(pid_t pid)
|
|
{
|
|
int slot;
|
|
|
|
slot = findfreeslot();
|
|
childpids[slot] = pid;
|
|
curprocs++;
|
|
}
|
|
|
|
static int
|
|
pids_remove(pid_t pid)
|
|
{
|
|
int slot;
|
|
|
|
if ((slot = findslot(pid)) < 0)
|
|
return (0);
|
|
|
|
clearslot(slot);
|
|
curprocs--;
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
findfreeslot(void)
|
|
{
|
|
int slot;
|
|
|
|
if ((slot = findslot(NOPID)) < 0)
|
|
errx(1, "internal error: no free pid slot");
|
|
return (slot);
|
|
}
|
|
|
|
static int
|
|
findslot(pid_t pid)
|
|
{
|
|
int slot;
|
|
|
|
for (slot = 0; slot < maxprocs; slot++)
|
|
if (childpids[slot] == pid)
|
|
return (slot);
|
|
return (-1);
|
|
}
|
|
|
|
static void
|
|
clearslot(int slot)
|
|
{
|
|
|
|
childpids[slot] = NOPID;
|
|
}
|
|
|
|
/*
|
|
* Prompt the user about running a command.
|
|
*/
|
|
static int
|
|
prompt(void)
|
|
{
|
|
regex_t cre;
|
|
size_t rsize;
|
|
int match;
|
|
char *response;
|
|
FILE *ttyfp;
|
|
|
|
if ((ttyfp = fopen(_PATH_TTY, "r")) == NULL)
|
|
return (2); /* Indicate that the TTY failed to open. */
|
|
(void)fprintf(stderr, "?...");
|
|
(void)fflush(stderr);
|
|
if ((response = fgetln(ttyfp, &rsize)) == NULL ||
|
|
regcomp(&cre, nl_langinfo(YESEXPR), REG_EXTENDED) != 0) {
|
|
(void)fclose(ttyfp);
|
|
return (0);
|
|
}
|
|
response[rsize - 1] = '\0';
|
|
match = regexec(&cre, response, 0, NULL, 0);
|
|
(void)fclose(ttyfp);
|
|
regfree(&cre);
|
|
return (match == 0);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
fprintf(stderr,
|
|
"usage: xargs [-0opt] [-E eofstr] [-I replstr [-R replacements] [-S replsize]]\n"
|
|
" [-J replstr] [-L number] [-n number [-x]] [-P maxprocs]\n"
|
|
" [-s size] [utility [argument ...]]\n");
|
|
exit(1);
|
|
}
|