IABSD.fr/src/bin/kill/kill.c

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• Author : millert
  Date : 2017-03-29 22:40:15
  Hash : 671c3ad7
  Message : Use strtonum(3) instead of strtol(3). OK deraadt@

• bin/kill/kill.c

• /*	$OpenBSD: kill.c,v 1.14 2017/03/29 22:40:15 millert Exp $	*/
  /*	$NetBSD: kill.c,v 1.11 1995/09/07 06:30:27 jtc Exp $	*/
  
  /*
   * Copyright (c) 1988, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <ctype.h>
  #include <err.h>
  #include <errno.h>
  #include <limits.h>
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  extern	char *__progname;
  
  void nosig(char *);
  void printsignals(FILE *);
  int signame_to_signum(char *);
  void usage(void);
  
  int
  main(int argc, char *argv[])
  {
  	int errors, numsig, pid;
  	const char *errstr;
  
  	if (pledge("stdio proc", NULL) == -1)
  		err(1, "pledge");
  
  	if (argc < 2)
  		usage();
  
  	numsig = SIGTERM;
  
  	argc--, argv++;
  	if (!strcmp(*argv, "-l")) {
  		argc--, argv++;
  		if (argc > 0 && !strcmp(*argv, "--"))
  			argc--, argv++;
  		if (argc > 1)
  			usage();
  		if (argc == 1) {
  			if (!isdigit((unsigned char)**argv))
  				usage();
  			numsig = strtonum(*argv, 1, NSIG + 127, &errstr);
  			if (errstr != NULL) {
  				if (errno == ERANGE)
  					nosig(*argv);
  				errx(1, "illegal signal number: %s", *argv);
  			}
  			printf("%s\n", sys_signame[numsig & 127]);
  			exit(0);
  		}
  		printsignals(stdout);
  		exit(0);
  	}
  
  	if (!strcmp(*argv, "-s")) {
  		argc--, argv++;
  		if (argc > 0 && !strcmp(*argv, "--"))
  			argc--, argv++;
  		if (argc < 1) {
  			warnx("option requires an argument -- s");
  			usage();
  		}
  		if (strcmp(*argv, "0")) {
  			if ((numsig = signame_to_signum(*argv)) < 0)
  				nosig(*argv);
  		} else
  			numsig = 0;
  		argc--, argv++;
  	} else if (**argv == '-') {
  		if (strcmp(*argv, "--")) {
  			++*argv;
  			if (isalpha((unsigned char)**argv)) {
  				if ((numsig = signame_to_signum(*argv)) < 0)
  					nosig(*argv);
  			} else if (isdigit((unsigned char)**argv)) {
  				numsig = strtonum(*argv, 0, NSIG - 1, &errstr);
  				if (errstr != NULL) {
  					if (errno == ERANGE)
  						nosig(*argv);
  					errx(1, "illegal signal number: %s", *argv);
  				}
  			} else
  				nosig(*argv);
  		}
  		argc--, argv++;
  	}
  
  	if (argc == 0)
  		usage();
  
  	for (errors = 0; argc; argc--, argv++) {
  		pid = strtonum(*argv, -INT_MAX, INT_MAX, &errstr);
  		if (errstr != NULL) {
  			warnx("illegal process id: %s", *argv);
  			errors = 1;
  		} else if (kill(pid, numsig) == -1) {
  			warn("%s", *argv);
  			errors = 1;
  		}
  	}
  
  	exit(errors);
  }
  
  int
  signame_to_signum(char *sig)
  {
  	int n;
  
  	if (!strncasecmp(sig, "sig", 3))
  		sig += 3;
  	for (n = 1; n < NSIG; n++) {
  		if (!strcasecmp(sys_signame[n], sig))
  			return (n);
  	}
  	return (-1);
  }
  
  void
  nosig(char *name)
  {
  
  	warnx("unknown signal %s; valid signals:", name);
  	printsignals(stderr);
  	exit(1);
  }
  
  void
  printsignals(FILE *fp)
  {
  	int n;
  
  	for (n = 1; n < NSIG; n++) {
  		(void)fprintf(fp, "%s", sys_signame[n]);
  		if (n == (NSIG / 2) || n == (NSIG - 1))
  			(void)fprintf(fp, "\n");
  		else
  			(void)fprintf(fp, " ");
  	}
  }
  
  void
  usage(void)
  {
  	(void)fprintf(stderr, "usage: %s [-s signal_name] pid ...\n",
  	    __progname);
  	(void)fprintf(stderr, "       %s -l [exit_status]\n", __progname);
  	(void)fprintf(stderr, "       %s -signal_name pid ...\n",
  	    __progname);
  	(void)fprintf(stderr, "       %s -signal_number pid ...\n",
  	    __progname);
  	exit(1);
  }