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-rw-r--r--lib/util/json.c388
1 files changed, 388 insertions, 0 deletions
diff --git a/lib/util/json.c b/lib/util/json.c
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index 0000000..6fac63f
--- /dev/null
+++ b/lib/util/json.c
@@ -0,0 +1,388 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2013-2020 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>
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif /* HAVE_STDBOOL_H */
+#include <string.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_fatal.h"
+#include "sudo_gettext.h"
+#include "sudo_json.h"
+#include "sudo_util.h"
+
+/*
+ * Double the size of the json buffer.
+ * Returns true on success, false if out of memory.
+ */
+static bool
+json_expand_buf(struct json_container *json)
+{
+ char *newbuf;
+ debug_decl(json_expand_buf, SUDO_DEBUG_UTIL);
+
+ if ((newbuf = reallocarray(json->buf, 2, json->bufsize)) == NULL) {
+ if (json->memfatal) {
+ sudo_fatalx(U_("%s: %s"),
+ __func__, U_("unable to allocate memory"));
+ }
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
+ "%s: %s", __func__, "unable to allocate memory");
+ debug_return_bool(false);
+ }
+ json->buf = newbuf;
+ json->bufsize *= 2;
+
+ debug_return_bool(true);
+}
+
+/*
+ * Start a new line and indent unless formatting as minimal JSON.
+ * Append "indent" number of blank characters.
+ */
+static bool
+json_new_line(struct json_container *json)
+{
+ int indent = json->indent_level;
+ debug_decl(json_new_line, SUDO_DEBUG_UTIL);
+
+ /* No non-essential white space in minimal mode. */
+ if (json->minimal)
+ debug_return_bool(true);
+
+ while (json->buflen + 1 + indent >= json->bufsize) {
+ if (!json_expand_buf(json))
+ debug_return_bool(false);
+ }
+ json->buf[json->buflen++] = '\n';
+ while (indent--) {
+ json->buf[json->buflen++] = ' ';
+ }
+ json->buf[json->buflen] = '\0';
+
+ debug_return_bool(true);
+}
+
+/*
+ * Append a string to the JSON buffer, expanding as needed.
+ * Does not perform any quoting.
+ */
+static bool
+json_append_buf(struct json_container *json, const char *str)
+{
+ size_t len;
+ debug_decl(json_append_buf, SUDO_DEBUG_UTIL);
+
+ len = strlen(str);
+ while (json->buflen + len >= json->bufsize) {
+ if (!json_expand_buf(json))
+ debug_return_bool(false);
+ }
+
+ memcpy(json->buf + json->buflen, str, len);
+ json->buflen += len;
+ json->buf[json->buflen] = '\0';
+
+ debug_return_bool(true);
+}
+
+/*
+ * Append a quoted JSON string, escaping special chars and expanding as needed.
+ * Does not support unicode escapes.
+ */
+static bool
+json_append_string(struct json_container *json, const char *str)
+{
+ char ch;
+ debug_decl(json_append_string, SUDO_DEBUG_UTIL);
+
+ if (!json_append_buf(json, "\""))
+ debug_return_bool(false);
+ while ((ch = *str++) != '\0') {
+ char buf[3], *cp = buf;
+
+ switch (ch) {
+ case '"':
+ case '\\':
+ *cp++ = '\\';
+ break;
+ case '\b':
+ *cp++ = '\\';
+ ch = 'b';
+ break;
+ case '\f':
+ *cp++ = '\\';
+ ch = 'f';
+ break;
+ case '\n':
+ *cp++ = '\\';
+ ch = 'n';
+ break;
+ case '\r':
+ *cp++ = '\\';
+ ch = 'r';
+ break;
+ case '\t':
+ *cp++ = '\\';
+ ch = 't';
+ break;
+ }
+ *cp++ = ch;
+ *cp++ = '\0';
+ if (!json_append_buf(json, buf))
+ debug_return_bool(false);
+ }
+ if (!json_append_buf(json, "\""))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+bool
+sudo_json_init_v1(struct json_container *json, int indent, bool minimal,
+ bool memfatal)
+{
+ debug_decl(sudo_json_init, SUDO_DEBUG_UTIL);
+
+ memset(json, 0, sizeof(*json));
+ json->indent_level = indent;
+ json->indent_increment = indent;
+ json->minimal = minimal;
+ json->memfatal = memfatal;
+ json->buf = malloc(64 * 1024);
+ if (json->buf == NULL) {
+ if (json->memfatal) {
+ sudo_fatalx(U_("%s: %s"),
+ __func__, U_("unable to allocate memory"));
+ }
+ sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
+ "%s: %s", __func__, "unable to allocate memory");
+ debug_return_bool(false);
+ }
+ *json->buf = '\0';
+ json->bufsize = 64 * 1024;
+
+ debug_return_bool(true);
+}
+
+void
+sudo_json_free_v1(struct json_container *json)
+{
+ debug_decl(sudo_json_free, SUDO_DEBUG_UTIL);
+
+ free(json->buf);
+ memset(json, 0, sizeof(*json));
+
+ debug_return;
+}
+
+bool
+sudo_json_open_object_v1(struct json_container *json, const char *name)
+{
+ debug_decl(sudo_json_open_object, SUDO_DEBUG_UTIL);
+
+ /* Add comma if we are continuing an object/array. */
+ if (json->need_comma) {
+ if (!json_append_buf(json, ","))
+ debug_return_bool(false);
+ }
+ if (!json_new_line(json))
+ debug_return_bool(false);
+
+ if (name != NULL) {
+ json_append_string(json, name);
+ if (!json_append_buf(json, json->minimal ? ":{" : ": {"))
+ debug_return_bool(false);
+ } else {
+ if (!json_append_buf(json, "{"))
+ debug_return_bool(false);
+ }
+
+ json->indent_level += json->indent_increment;
+ json->need_comma = false;
+
+ debug_return_bool(true);
+}
+
+bool
+sudo_json_close_object_v1(struct json_container *json)
+{
+ debug_decl(sudo_json_close_object, SUDO_DEBUG_UTIL);
+
+ if (!json->minimal) {
+ json->indent_level -= json->indent_increment;
+ if (!json_new_line(json))
+ debug_return_bool(false);
+ }
+ if (!json_append_buf(json, "}"))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+bool
+sudo_json_open_array_v1(struct json_container *json, const char *name)
+{
+ debug_decl(sudo_json_open_array, SUDO_DEBUG_UTIL);
+
+ /* Add comma if we are continuing an object/array. */
+ if (json->need_comma) {
+ if (!json_append_buf(json, ","))
+ debug_return_bool(false);
+ }
+ if (!json_new_line(json))
+ debug_return_bool(false);
+
+ if (name != NULL) {
+ json_append_string(json, name);
+ if (!json_append_buf(json, json->minimal ? ":[" : ": ["))
+ debug_return_bool(false);
+ } else {
+ if (!json_append_buf(json, "["))
+ debug_return_bool(false);
+ }
+
+ json->indent_level += json->indent_increment;
+ json->need_comma = false;
+
+ debug_return_bool(true);
+}
+
+bool
+sudo_json_close_array_v1(struct json_container *json)
+{
+ debug_decl(sudo_json_close_array, SUDO_DEBUG_UTIL);
+
+ if (!json->minimal) {
+ json->indent_level -= json->indent_increment;
+ if (!json_new_line(json))
+ debug_return_bool(false);
+ }
+ if (!json_append_buf(json, "]"))
+ debug_return_bool(false);
+
+ debug_return_bool(true);
+}
+
+static bool
+sudo_json_add_value_int(struct json_container *json, const char *name,
+ struct json_value *value, bool as_object)
+{
+ char numbuf[(((sizeof(long long) * 8) + 2) / 3) + 2];
+ debug_decl(sudo_json_add_value, SUDO_DEBUG_UTIL);
+
+ /* Add comma if we are continuing an object/array. */
+ if (json->need_comma) {
+ if (!json_append_buf(json, ","))
+ debug_return_bool(false);
+ }
+ if (!json_new_line(json))
+ debug_return_bool(false);
+ json->need_comma = true;
+
+ if (as_object) {
+ if (!json_append_buf(json, json->minimal ? "{" : "{ "))
+ debug_return_bool(false);
+ }
+
+ /* name */
+ if (name != NULL) {
+ if (!json_append_string(json, name))
+ debug_return_bool(false);
+ if (!json_append_buf(json, json->minimal ? ":" : ": "))
+ debug_return_bool(false);
+ }
+
+ /* value */
+ switch (value->type) {
+ case JSON_STRING:
+ if (!json_append_string(json, value->u.string))
+ debug_return_bool(false);
+ break;
+ case JSON_ID:
+ snprintf(numbuf, sizeof(numbuf), "%u", (unsigned int)value->u.id);
+ if (!json_append_buf(json, numbuf))
+ debug_return_bool(false);
+ break;
+ case JSON_NUMBER:
+ snprintf(numbuf, sizeof(numbuf), "%lld", value->u.number);
+ if (!json_append_buf(json, numbuf))
+ debug_return_bool(false);
+ break;
+ case JSON_NULL:
+ if (!json_append_buf(json, "null"))
+ debug_return_bool(false);
+ break;
+ case JSON_BOOL:
+ if (!json_append_buf(json, value->u.boolean ? "true" : "false"))
+ debug_return_bool(false);
+ break;
+ case JSON_ARRAY:
+ sudo_fatalx("internal error: can't print JSON_ARRAY");
+ break;
+ case JSON_OBJECT:
+ sudo_fatalx("internal error: can't print JSON_OBJECT");
+ break;
+ }
+
+ if (as_object) {
+ if (!json_append_buf(json, json->minimal ? "}" : " }"))
+ debug_return_bool(false);
+ }
+
+ debug_return_bool(true);
+}
+
+bool
+sudo_json_add_value_v1(struct json_container *json, const char *name,
+ struct json_value *value)
+{
+ return sudo_json_add_value_int(json, name, value, false);
+}
+
+bool
+sudo_json_add_value_as_object_v1(struct json_container *json, const char *name,
+ struct json_value *value)
+{
+ return sudo_json_add_value_int(json, name, value, true);
+}
+
+char *
+sudo_json_get_buf_v1(struct json_container *json)
+{
+ return json->buf;
+}
+
+unsigned int
+sudo_json_get_len_v1(struct json_container *json)
+{
+ return json->buflen;
+}
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