170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2019 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#ifndef HAVE_STR2SIG
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <ctype.h>
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#include <signal.h>
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#include <unistd.h>
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#include "sudo_compat.h"
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#include "sudo_util.h"
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#if defined(HAVE_DECL_SYS_SIGNAME) && HAVE_DECL_SYS_SIGNAME == 1
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# define sudo_sys_signame sys_signame
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#elif defined(HAVE_DECL__SYS_SIGNAME) && HAVE_DECL__SYS_SIGNAME == 1
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# define sudo_sys_signame _sys_signame
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#elif defined(HAVE_DECL_SYS_SIGABBREV) && HAVE_DECL_SYS_SIGABBREV == 1
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# define sudo_sys_signame sys_sigabbrev
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#else
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# ifdef HAVE_SYS_SIGABBREV
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/* sys_sigabbrev is not declared by glibc */
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# define sudo_sys_signame sys_sigabbrev
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# endif
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extern const char *const sudo_sys_signame[NSIG];
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#endif
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/*
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* Many systems use aliases for source backward compatibility.
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*/
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static struct sigalias {
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const char *name;
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int number;
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} sigaliases[] = {
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#ifdef SIGABRT
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{ "ABRT", SIGABRT },
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#endif
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#ifdef SIGCLD
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{ "CLD", SIGCLD },
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#endif
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#ifdef SIGIO
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{ "IO", SIGIO },
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#endif
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#ifdef SIGIOT
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{ "IOT", SIGIOT },
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#endif
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#ifdef SIGLOST
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{ "LOST", SIGLOST },
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#endif
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#ifdef SIGPOLL
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{ "POLL", SIGPOLL },
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#endif
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{ NULL, -1 }
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};
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/*
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* Translate signal name to number.
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*/
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int
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sudo_str2sig(const char *signame, int *result)
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{
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struct sigalias *alias;
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const char *errstr;
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int signo;
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/* Could be a signal number encoded as a string. */
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if (isdigit((unsigned char)signame[0])) {
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signo = sudo_strtonum(signame, 0, NSIG - 1, &errstr);
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if (errstr != NULL)
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return -1;
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*result = signo;
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return 0;
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}
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/* Check real-time signals. */
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#if defined(SIGRTMIN)
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if (strncmp(signame, "RTMIN", 5) == 0) {
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if (signame[5] == '\0') {
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*result = SIGRTMIN;
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return 0;
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}
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if (signame[5] == '+') {
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if (isdigit((unsigned char)signame[6])) {
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const long rtmax = sysconf(_SC_RTSIG_MAX);
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const int off = signame[6] - '0';
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if (rtmax > 0 && off < rtmax / 2) {
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*result = SIGRTMIN + off;
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return 0;
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}
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}
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}
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}
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#endif
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#if defined(SIGRTMAX)
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if (strncmp(signame, "RTMAX", 5) == 0) {
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if (signame[5] == '\0') {
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*result = SIGRTMAX;
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return 0;
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}
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if (signame[5] == '-') {
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if (isdigit((unsigned char)signame[6])) {
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const long rtmax = sysconf(_SC_RTSIG_MAX);
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const int off = signame[6] - '0';
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if (rtmax > 0 && off < rtmax / 2) {
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*result = SIGRTMAX - off;
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return 0;
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}
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}
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}
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}
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#endif
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/* Check aliases. */
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for (alias = sigaliases; alias->name != NULL; alias++) {
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if (strcmp(signame, alias->name) == 0) {
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*result = alias->number;
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return 0;
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}
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}
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/* Check sys_signame[]. */
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for (signo = 1; signo < NSIG; signo++) {
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if (sudo_sys_signame[signo] != NULL) {
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/* On macOS sys_signame[] may contain lower-case names. */
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if (strcasecmp(signame, sudo_sys_signame[signo]) == 0) {
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*result = signo;
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return 0;
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}
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}
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}
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errno = EINVAL;
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return -1;
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}
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#endif /* HAVE_STR2SIG */
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