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-rw-r--r--lib/util/str2sig.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/lib/util/str2sig.c b/lib/util/str2sig.c
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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 */