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-rw-r--r--lib/util/fatal.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/lib/util/fatal.c b/lib/util/fatal.c
new file mode 100644
index 0000000..bdee6a1
--- /dev/null
+++ b/lib/util/fatal.c
@@ -0,0 +1,345 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2004-2005, 2010-2015, 2017-2018
+ * 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>
+
+#include <errno.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include <compat/stdbool.h>
+#endif /* HAVE_STDBOOL_H */
+#include <unistd.h>
+#ifndef HAVE_GETADDRINFO
+# include <compat/getaddrinfo.h>
+#endif
+
+#include <sudo_compat.h>
+#include <sudo_fatal.h>
+#include <sudo_gettext.h>
+#include <sudo_queue.h>
+#include <sudo_util.h>
+#include <sudo_plugin.h>
+
+struct sudo_fatal_callback {
+ SLIST_ENTRY(sudo_fatal_callback) entries;
+ void (*func)(void);
+};
+SLIST_HEAD(sudo_fatal_callback_list, sudo_fatal_callback);
+
+static struct sudo_fatal_callback_list callbacks = SLIST_HEAD_INITIALIZER(&callbacks);
+static sudo_conv_t sudo_warn_conversation;
+static sudo_warn_setlocale_t sudo_warn_setlocale;
+static sudo_warn_setlocale_t sudo_warn_setlocale_prev;
+
+static void warning(const char * restrict errstr, const char * restrict fmt, va_list ap);
+
+static void
+do_cleanup(void)
+{
+ struct sudo_fatal_callback *cb;
+
+ /* Run callbacks, removing them from the list as we go. */
+ while ((cb = SLIST_FIRST(&callbacks)) != NULL) {
+ SLIST_REMOVE_HEAD(&callbacks, entries);
+ cb->func();
+ free(cb);
+ }
+}
+
+sudo_noreturn void
+sudo_fatal_nodebug_v1(const char * restrict fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ warning(strerror(errno), fmt, ap);
+ va_end(ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+sudo_noreturn void
+sudo_fatalx_nodebug_v1(const char * restrict fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ warning(NULL, fmt, ap);
+ va_end(ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+sudo_noreturn void
+sudo_vfatal_nodebug_v1(const char * restrict fmt, va_list ap)
+{
+ warning(strerror(errno), fmt, ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+sudo_noreturn void
+sudo_vfatalx_nodebug_v1(const char * restrict fmt, va_list ap)
+{
+ warning(NULL, fmt, ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+void
+sudo_warn_nodebug_v1(const char * restrict fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ warning(strerror(errno), fmt, ap);
+ va_end(ap);
+}
+
+void
+sudo_warnx_nodebug_v1(const char * restrict fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ warning(NULL, fmt, ap);
+ va_end(ap);
+}
+
+void
+sudo_vwarn_nodebug_v1(const char * restrict fmt, va_list ap)
+{
+ warning(strerror(errno), fmt, ap);
+}
+
+void
+sudo_vwarnx_nodebug_v1(const char * restrict fmt, va_list ap)
+{
+ warning(NULL, fmt, ap);
+}
+
+sudo_noreturn void
+sudo_gai_fatal_nodebug_v1(int errnum, const char * restrict fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ warning(gai_strerror(errnum), fmt, ap);
+ va_end(ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+sudo_noreturn void
+sudo_gai_vfatal_nodebug_v1(int errnum, const char * restrict fmt, va_list ap)
+{
+ warning(gai_strerror(errnum), fmt, ap);
+ do_cleanup();
+ exit(EXIT_FAILURE);
+}
+
+void
+sudo_gai_warn_nodebug_v1(int errnum, const char * restrict fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ warning(gai_strerror(errnum), fmt, ap);
+ va_end(ap);
+}
+
+void
+sudo_gai_vwarn_nodebug_v1(int errnum, const char * restrict fmt, va_list ap)
+{
+ warning(gai_strerror(errnum), fmt, ap);
+}
+
+static void
+warning(const char * restrict errstr, const char * restrict fmt, va_list ap)
+{
+ int cookie;
+ const int saved_errno = errno;
+
+ /* Set user locale if setter was specified. */
+ if (sudo_warn_setlocale != NULL)
+ sudo_warn_setlocale(false, &cookie);
+
+ if (sudo_warn_conversation != NULL) {
+ struct sudo_conv_message msgs[6];
+ char static_buf[1024], *buf = static_buf;
+ int nmsgs = 0;
+
+ /* Use conversation function. */
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = getprogname();
+ if (fmt != NULL) {
+ va_list ap2;
+ int buflen;
+
+ /* Use static buffer if possible, else dynamic. */
+ va_copy(ap2, ap);
+ buflen = vsnprintf(static_buf, sizeof(static_buf), fmt, ap2);
+ va_end(ap2);
+ if (buflen >= ssizeof(static_buf)) {
+ /* Not enough room in static buf, allocate dynamically. */
+ if (vasprintf(&buf, fmt, ap) == -1)
+ buf = static_buf;
+ }
+ if (buflen > 0) {
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = ": ";
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = buf;
+ }
+ }
+ if (errstr != NULL) {
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = ": ";
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = errstr;
+ }
+ msgs[nmsgs].msg_type = SUDO_CONV_ERROR_MSG;
+ msgs[nmsgs++].msg = "\n";
+ sudo_warn_conversation(nmsgs, msgs, NULL, NULL);
+ if (buf != static_buf)
+ free(buf);
+ } else {
+ /* Write to the standard error. */
+ fputs(getprogname(), stderr);
+ if (fmt != NULL) {
+ fputs(": ", stderr);
+ vfprintf(stderr, fmt, ap);
+ }
+ if (errstr != NULL) {
+ fputs(": ", stderr);
+ fputs(errstr, stderr);
+ }
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+ if (sudo_term_is_raw(fileno(stderr)))
+ putc('\r', stderr);
+#endif
+ putc('\n', stderr);
+ }
+
+ /* Restore old locale as needed. */
+ if (sudo_warn_setlocale != NULL)
+ sudo_warn_setlocale(true, &cookie);
+
+ /* Do not clobber errno. */
+ errno = saved_errno;
+}
+
+/*
+ * Register a callback to be run when sudo_fatal()/sudo_fatalx() is called.
+ */
+int
+sudo_fatal_callback_register_v1(sudo_fatal_callback_t func)
+{
+ struct sudo_fatal_callback *cb;
+
+ /* Do not register the same callback twice. */
+ SLIST_FOREACH(cb, &callbacks, entries) {
+ if (func == cb->func)
+ return -1; /* dupe! */
+ }
+
+ /* Allocate and insert new callback. */
+ cb = malloc(sizeof(*cb));
+ if (cb == NULL)
+ return -1;
+ cb->func = func;
+ SLIST_INSERT_HEAD(&callbacks, cb, entries);
+
+ return 0;
+}
+
+/*
+ * Deregister a sudo_fatal()/sudo_fatalx() callback.
+ */
+int
+sudo_fatal_callback_deregister_v1(sudo_fatal_callback_t func)
+{
+ struct sudo_fatal_callback *cb, *prev = NULL;
+
+ /* Search for callback and remove if found, dupes are not allowed. */
+ SLIST_FOREACH(cb, &callbacks, entries) {
+ if (cb->func == func) {
+ if (prev == NULL)
+ SLIST_REMOVE_HEAD(&callbacks, entries);
+ else
+ SLIST_REMOVE_AFTER(prev, entries);
+ free(cb);
+ return 0;
+ }
+ prev = cb;
+ }
+
+ return -1;
+}
+
+/*
+ * Set the conversation function to use for output insteaf of the
+ * standard error. If conv is NULL, switch back to standard error.
+ */
+void
+sudo_warn_set_conversation_v1(sudo_conv_t conv)
+{
+ sudo_warn_conversation = conv;
+}
+
+/*
+ * Set the locale function so the plugin can use a non-default
+ * locale for user warnings.
+ */
+void
+sudo_warn_set_locale_func_v1(sudo_warn_setlocale_t func)
+{
+ sudo_warn_setlocale_prev = sudo_warn_setlocale;
+ sudo_warn_setlocale = func;
+}
+
+#ifdef HAVE_LIBINTL_H
+char *
+sudo_warn_gettext_v1(const char *domainname, const char *msgid)
+{
+ int cookie;
+ char *msg;
+
+ /* Set user locale if setter was specified. */
+ if (sudo_warn_setlocale != NULL)
+ sudo_warn_setlocale(false, &cookie);
+
+ msg = dgettext(domainname, msgid);
+
+ /* Restore old locale as needed. */
+ if (sudo_warn_setlocale != NULL)
+ sudo_warn_setlocale(true, &cookie);
+
+ return msg;
+}
+#endif /* HAVE_LIBINTL_H */
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