Adding upstream version 3.2.6.upstream/3.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/src/utils/knsupdate/knsupdate_interactive.c b/src/utils/knsupdate/knsupdate_interactive.c
new file mode 100644
index 0000000..0e4ed66
--- /dev/null
+++ b/src/utils/knsupdate/knsupdate_interactive.c
@@ -0,0 +1,177 @@
+/*  Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <histedit.h>
+
+#include "contrib/string.h"
+#include "utils/common/lookup.h"
+#include "utils/common/msg.h"
+#include "utils/knsupdate/knsupdate_exec.h"
+#include "utils/knsupdate/knsupdate_interactive.h"
+
+#define HISTORY_FILE	".knsupdate_history"
+
+static char *prompt(EditLine *el)
+{
+	return PROGRAM_NAME"> ";
+}
+
+static void print_commands(void)
+{
+	printf("\n");
+
+	for (const char **cmd = knsupdate_cmd_array; *cmd != NULL; cmd++) {
+		printf(" %-18s\n", (*cmd) + 1);
+	}
+}
+
+static void cmds_lookup(EditLine *el, const char *str, size_t str_len)
+{
+	lookup_t lookup;
+	int ret = lookup_init(&lookup);
+	if (ret != KNOT_EOK) {
+		return;
+	}
+
+	// Fill the lookup with command names.
+	for (const char **desc = knsupdate_cmd_array; *desc != NULL; desc++) {
+		ret = lookup_insert(&lookup, (*desc) + 1, NULL);
+		if (ret != KNOT_EOK) {
+			goto cmds_lookup_finish;
+		}
+	}
+
+	(void)lookup_complete(&lookup, str, str_len, el, true);
+
+cmds_lookup_finish:
+	lookup_deinit(&lookup);
+}
+
+static unsigned char complete(EditLine *el, int ch)
+{
+	int argc, token, pos;
+	const char **argv;
+
+	const LineInfo *li = el_line(el);
+	Tokenizer *tok = tok_init(NULL);
+
+	// Parse the line.
+	int ret = tok_line(tok, li, &argc, &argv, &token, &pos);
+	if (ret != 0) {
+		goto complete_exit;
+	}
+
+	// Show possible commands.
+	if (argc == 0) {
+		print_commands();
+		goto complete_exit;
+	}
+
+	// Complete the command name.
+	if (token == 0) {
+		cmds_lookup(el, argv[0], pos);
+		goto complete_exit;
+	}
+
+	// Find the command descriptor.
+	const char **desc = knsupdate_cmd_array;
+	while (*desc != NULL && strcmp((*desc) + 1, argv[0]) != 0) {
+		desc++;
+	}
+	if (*desc == NULL) {
+		goto complete_exit;
+	}
+
+complete_exit:
+	tok_reset(tok);
+	tok_end(tok);
+
+	return CC_REDISPLAY;
+}
+
+int interactive_loop(knsupdate_params_t *params)
+{
+	char *hist_file = NULL;
+	const char *home = getenv("HOME");
+	if (home != NULL) {
+		hist_file = sprintf_alloc("%s/%s", home, HISTORY_FILE);
+	}
+	if (hist_file == NULL) {
+		INFO("failed to get home directory");
+	}
+
+	EditLine *el = el_init(PROGRAM_NAME, stdin, stdout, stderr);
+	if (el == NULL) {
+		ERR("interactive mode not available");
+		free(hist_file);
+		return KNOT_ERROR;
+	}
+
+	History *hist = history_init();
+	if (hist == NULL) {
+		ERR("interactive mode not available");
+		el_end(el);
+		free(hist_file);
+		return KNOT_ERROR;
+	}
+
+	HistEvent hev = { 0 };
+	history(hist, &hev, H_SETSIZE, 1000);
+	history(hist, &hev, H_SETUNIQUE, 1);
+	el_set(el, EL_HIST, history, hist);
+	history(hist, &hev, H_LOAD, hist_file);
+
+	el_set(el, EL_TERMINAL, NULL);
+	el_set(el, EL_EDITOR, "emacs");
+	el_set(el, EL_PROMPT, prompt);
+	el_set(el, EL_SIGNAL, 1);
+	el_source(el, NULL);
+
+	// Warning: these two el_sets()'s always leak -- in libedit2 library!
+	// For more details see this commit's message.
+	el_set(el, EL_ADDFN, PROGRAM_NAME"-complete",
+	       "Perform "PROGRAM_NAME" completion.", complete);
+	el_set(el, EL_BIND, "^I",  PROGRAM_NAME"-complete", NULL);
+
+	int count;
+	const char *line;
+	while ((line = el_gets(el, &count)) != NULL && count > 0) {
+		char command[count + 1];
+		memcpy(command, line, count);
+		command[count] = '\0';
+		// Removes trailing newline
+		size_t cmd_len = strcspn(command, "\n");
+		command[cmd_len] = '\0';
+
+		if (cmd_len > 0) {
+			history(hist, &hev, H_ENTER, command);
+			history(hist, &hev, H_SAVE, hist_file);
+		}
+
+		// Process the command.
+		(void)knsupdate_process_line(command, params);
+		if (params->stop) {
+			break;
+		}
+	}
+
+	history_end(hist);
+	free(hist_file);
+
+	el_end(el);
+
+	return KNOT_EOK;
+}