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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#ifndef HAVE_STR2SIG
#include <errno.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <ctype.h>
#include <signal.h>
#include <unistd.h>
#include "sudo_compat.h"
#include "sudo_util.h"
#if !defined(HAVE_SIGABBREV_NP)
# if defined(HAVE_DECL_SYS_SIGNAME) && HAVE_DECL_SYS_SIGNAME == 1
# define sigabbrev_np(_x) sys_signame[(_x)]
# elif defined(HAVE_DECL__SYS_SIGNAME) && HAVE_DECL__SYS_SIGNAME == 1
# define sigabbrev_np(_x) _sys_signame[(_x)]
# elif defined(HAVE_SYS_SIGABBREV)
# define sigabbrev_np(_x) sys_sigabbrev[(_x)]
# if defined(HAVE_DECL_SYS_SIGABBREV) && HAVE_DECL_SYS_SIGABBREV == 0
/* sys_sigabbrev is not declared by glibc */
extern const char *const sys_sigabbrev[NSIG];
# endif
# else
# define sigabbrev_np(_x) sudo_sys_signame[(_x)]
extern const char *const sudo_sys_signame[NSIG];
# endif
#endif /* !HAVE_SIGABBREV_NP */
/*
* Many systems use aliases for source backward compatibility.
*/
static struct sigalias {
const char *name;
int number;
} sigaliases[] = {
#ifdef SIGABRT
{ "ABRT", SIGABRT },
#endif
#ifdef SIGCLD
{ "CLD", SIGCLD },
#endif
#ifdef SIGIO
{ "IO", SIGIO },
#endif
#ifdef SIGIOT
{ "IOT", SIGIOT },
#endif
#ifdef SIGLOST
{ "LOST", SIGLOST },
#endif
#ifdef SIGPOLL
{ "POLL", SIGPOLL },
#endif
{ NULL, -1 }
};
/*
* Translate signal name to number.
*/
int
sudo_str2sig(const char *signame, int *result)
{
struct sigalias *alias;
const char *errstr;
int signo;
/* Could be a signal number encoded as a string. */
if (isdigit((unsigned char)signame[0])) {
signo = sudo_strtonum(signame, 0, NSIG - 1, &errstr);
if (errstr != NULL)
return -1;
*result = signo;
return 0;
}
/* Check real-time signals. */
#if defined(SIGRTMIN)
if (strncmp(signame, "RTMIN", 5) == 0) {
if (signame[5] == '\0') {
*result = SIGRTMIN;
return 0;
}
if (signame[5] == '+') {
if (isdigit((unsigned char)signame[6])) {
# ifdef _SC_RTSIG_MAX
const long rtmax = sysconf(_SC_RTSIG_MAX);
# else
const long rtmax = SIGRTMAX - SIGRTMIN;
# endif
const int off = signame[6] - '0';
if (rtmax > 0 && off < rtmax / 2) {
*result = SIGRTMIN + off;
return 0;
}
}
}
}
#endif
#if defined(SIGRTMAX)
if (strncmp(signame, "RTMAX", 5) == 0) {
if (signame[5] == '\0') {
*result = SIGRTMAX;
return 0;
}
if (signame[5] == '-') {
if (isdigit((unsigned char)signame[6])) {
# ifdef _SC_RTSIG_MAX
const long rtmax = sysconf(_SC_RTSIG_MAX);
# else
const long rtmax = SIGRTMAX - SIGRTMIN;
# endif
const int off = signame[6] - '0';
if (rtmax > 0 && off < rtmax / 2) {
*result = SIGRTMAX - off;
return 0;
}
}
}
}
#endif
/* Check aliases. */
for (alias = sigaliases; alias->name != NULL; alias++) {
if (strcmp(signame, alias->name) == 0) {
*result = alias->number;
return 0;
}
}
for (signo = 1; signo < NSIG; signo++) {
const char *cp = sigabbrev_np(signo);
if (cp != NULL) {
/* On macOS sys_signame[] may contain lower-case names. */
if (strcasecmp(signame, cp) == 0) {
*result = signo;
return 0;
}
}
}
errno = EINVAL;
return -1;
}
#endif /* HAVE_STR2SIG */
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