Adding upstream version 5.7.1.upstream/5.7.1

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

1 files changed, 458 insertions, 0 deletions

diff --git a/utils/client/kresc.c b/utils/client/kresc.c
new file mode 100644
index 0000000..e083470
--- /dev/null
+++ b/utils/client/kresc.c
@@ -0,0 +1,458 @@
+/*  Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
+ *  SPDX-License-Identifier: GPL-3.0-or-later
+ */
+#include <arpa/inet.h>
+#include <contrib/ccan/asprintf/asprintf.h>
+#include <editline/readline.h>
+#include <errno.h>
+#include <histedit.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#define HISTORY_FILE "kresc_history"
+#define PROGRAM_NAME "kresc"
+
+FILE *g_tty = NULL;		//!< connection to the daemon
+
+static char *run_cmd(const char *cmd, size_t * out_len);
+
+const char *prompt(EditLine * e)
+{
+	return PROGRAM_NAME "> ";
+}
+
+bool starts_with(const char *a, const char *b)
+{
+	if (strncmp(a, b, strlen(b)) == 0)
+		return 1;
+	return 0;
+}
+
+//! Returns Lua name of type of value, NULL on error. Puts length of type in name_len;
+char *get_type_name(const char *value)
+{
+	if (value == NULL) {
+		return NULL;
+	}
+
+	for (int i = 0; value[i]; i++) {
+		if (value[i] == ')') {
+			//Return NULL to prevent unexpected function call
+			return NULL;
+		}
+	}
+
+	char *cmd = afmt("type(%s)", value);
+	if (!cmd) {
+		perror("While tab-completing.");
+		return NULL;
+	}
+
+	size_t name_len;
+	char *type = run_cmd(cmd, &name_len);
+	if (!type) {
+		return NULL;
+	}
+	free(cmd);
+
+	if (starts_with(type, "[")) {
+		//Return "nil" on non-valid name.
+		free(type);
+		return strdup("nil");
+	} else {
+		type[strlen(type) - 1] = '\0';
+		return type;
+	}
+}
+
+static void complete_function(EditLine * el)
+{
+	//Add left parenthesis to function name.
+	el_insertstr(el, "(");
+}
+
+static void complete_members(EditLine * el, const char *str,
+			     const char *str_type, int str_len, char *dot)
+{
+	char *table = strdup(str);
+	if (!table) {
+		perror("While tab-completing");
+		return;
+	}
+	//Get only the table name (without partial member name).
+	if (dot) {
+		*(table + (dot - str)) = '\0';
+	}
+	//Insert a dot after the table name.
+	if (!strncmp(str_type, "table", 5)) {
+		el_insertstr(el, ".");
+		str_len++;
+	}
+	//Check if the substring before dot is a valid table name.
+	const char *t_type = get_type_name(table);
+	if (t_type && !strncmp("table", t_type, 5)) {
+		//Get string of members of the table.
+		char *cmd =
+		    afmt
+		    ("do local s=\"\"; for i in pairs(%s) do s=s..i..\"\\n\" end return(s) end",
+		     table);
+		if (!cmd) {
+			perror("While tab-completing.");
+			goto complete_members_exit;
+		}
+		size_t members_len;
+		char *members = run_cmd(cmd, &members_len);
+		free(cmd);
+		if (!members) {
+			perror("While communication with daemon");
+			goto complete_members_exit;
+		}
+		//Split members by newline.
+		char *members_tok = strdup(members);
+		free(members);
+		if (!members_tok) {
+			goto complete_members_exit;
+		}
+		char *token = strtok(members_tok, "\n");
+		int matches = 0;
+		char *lastmatch = NULL;
+		if (!dot || dot - str + 1 == strlen(str)) {
+			//Prints all members.
+			while (token) {
+				char *member = afmt("%s.%s", table, token);
+				const char *member_type = get_type_name(member);
+				if (member && member_type) {
+					printf("\n%s (%s)", member, member_type);
+					free(member);
+					free((void *)member_type);
+				} else if (member) {
+					printf("\n%s", member);
+					free(member);
+				}
+				token = strtok(NULL, "\n");
+				matches++;
+			}
+		} else {
+			//Print members matching the current line.
+			while (token) {
+				if (starts_with(token, dot + 1)) {
+					const char *member_type =
+					    get_type_name(afmt
+							  ("%s.%s", table,
+							   token));
+					if (member_type) {
+						printf("\n%s.%s (%s)", table,
+						       token, member_type);
+						free((void *)member_type);
+					} else {
+						printf("\n%s.%s", table, token);
+					}
+					lastmatch = token;
+					matches++;
+				}
+				token = strtok(NULL, "\n");
+			}
+
+			//Complete matching member.
+			if (matches == 1) {
+				el_deletestr(el, str_len);
+				el_insertstr(el, table);
+				el_insertstr(el, ".");
+				el_insertstr(el, lastmatch);
+			}
+		}
+		if (matches > 1) {
+			printf("\n");
+		}
+		free(members_tok);
+	}
+
+complete_members_exit:
+	free(table);
+	if(t_type) {
+		free((void*)t_type);
+	}
+}
+
+static void complete_globals(EditLine * el, const char *str, int str_len)
+{
+	//Parse Lua globals.
+	size_t globals_len;
+	char *globals = run_cmd("_G.__orig_name_list", &globals_len);
+	if (!globals) {
+		perror("While tab-completing");
+		return;
+	}
+	//Show possible globals.
+	char *globals_tok = strdup(globals);
+	free(globals);
+	if (!globals_tok) {
+		return;
+	}
+	char *token = strtok(globals_tok, "\n");
+	int matches = 0;
+	char *lastmatch = NULL;
+	while (token) {
+		if (str && starts_with(token, str)) {
+			char *name = get_type_name(token);
+			printf("\n%s (%s)", token, name);
+			free(name);
+			lastmatch = token;
+			matches++;
+		}
+		token = strtok(NULL, "\n");
+	}
+	if (matches > 1) {
+		printf("\n");
+	}
+	//Complete matching global.
+	if (matches == 1) {
+		el_deletestr(el, str_len);
+		el_insertstr(el, lastmatch);
+	}
+	free(globals_tok);
+}
+
+static unsigned char complete(EditLine * el, int ch)
+{
+	int argc, pos;
+	const char **argv;
+	const LineInfo *li = el_line(el);
+	Tokenizer *tok = tok_init(NULL);
+
+	//Tokenize current line.
+	int ret = tok_line(tok, li, &argc, &argv, NULL, &pos);
+
+	if (ret != 0) {
+		perror("While tab-completing.");
+		goto complete_exit;
+	}
+	//Show help.
+	if (argc == 0) {
+		size_t help_len;
+		char *help = run_cmd("help()", &help_len);
+		if (help) {
+			printf("\n%s", help);
+			free(help);
+		} else {
+			perror("While communication with daemon");
+		}
+		goto complete_exit;
+	}
+
+	if (argc > 1) {
+		goto complete_exit;
+	}
+	//Get name of type of current line.
+	const char *type = get_type_name(argv[0]);
+
+	if (!type) {
+		goto complete_exit;
+	}
+	//Get position of last dot in current line (useful for parsing table).
+	char *dot = strrchr(argv[0], '.');
+
+	if (strncmp(type, "table", 5) != 0 && !dot) {
+		//Line is not a name of some table and there is no dot in it.
+		complete_globals(el, argv[0], pos);
+	} else if ((dot && strncmp(type, "nil", 3) == 0)
+		   || strncmp(type, "table", 5) == 0) {
+		//Current line (or part of it) is a name of some table.
+		complete_members(el, argv[0], type, pos, dot);
+	} else if (strncmp(type, "function", 8) == 0) {
+		//Current line is a function.
+		complete_function(el);
+	}
+	if (type) {
+		free((void *)type);
+	}
+
+complete_exit:
+	tok_reset(tok);
+	tok_end(tok);
+	return CC_REDISPLAY;
+}
+
+//! Initialize connection to the daemon; return 0 on success.
+static int init_tty(const char *path)
+{
+	int fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (fd < 0)
+		return 1;
+
+	struct sockaddr_un addr;
+	addr.sun_family = AF_UNIX;
+	size_t plen = strlen(path);
+	if (plen + 1 > sizeof(addr.sun_path)) {
+		fprintf(stderr, "Path too long\n");
+		close(fd);
+		return 1;
+	}
+	memcpy(addr.sun_path, path, plen + 1);
+	if (connect(fd, (const struct sockaddr *)&addr, sizeof(addr))) {
+		perror("While connecting to daemon");
+		close(fd);
+		return 1;
+	}
+	g_tty = fdopen(fd, "r+");
+	if (!g_tty) {
+		perror("While opening TTY");
+		close(fd);
+		return 1;
+	}
+
+	// Switch to binary mode and consume the text "> ".
+	if (fprintf(g_tty, "__binary\n") < 0 || !fread(&addr, 2, 1, g_tty)
+	    || fflush(g_tty)) {
+		perror("While initializing TTY");
+		fclose(g_tty);
+		g_tty = NULL;
+		return 1;
+	}
+
+	return 0;
+}
+
+//! Run a command on the daemon; return the answer or NULL on failure, puts answer length to out_len.
+static char *run_cmd(const char *cmd, size_t * out_len)
+{
+	if (!g_tty || !cmd)
+		return NULL;
+	if (fprintf(g_tty, "%s", cmd) < 0 || fflush(g_tty))
+		return NULL;
+	uint32_t len;
+	if (!fread(&len, sizeof(len), 1, g_tty))
+		return NULL;
+	len = ntohl(len);
+	if (!len)
+		return NULL;
+	char *msg = malloc(1 + (size_t) len);
+	if (!msg)
+		return NULL;
+	if (len && !fread(msg, len, 1, g_tty)) {
+		free(msg);
+		return NULL;
+	}
+	msg[len] = '\0';
+	*out_len = len;
+	return msg;
+}
+
+static int interact(void)
+{
+	EditLine *el;
+	History *hist;
+	int count;
+	const char *line;
+	HistEvent ev;
+	el = el_init(PROGRAM_NAME, stdin, stdout, stderr);
+	el_set(el, EL_PROMPT, prompt);
+	el_set(el, EL_EDITOR, "emacs");
+	el_set(el, EL_ADDFN, PROGRAM_NAME "-complete",
+	       "Perform " PROGRAM_NAME " completion.", complete);
+	el_set(el, EL_BIND, "^I", PROGRAM_NAME "-complete", NULL);
+
+	hist = history_init();
+	if (hist == 0) {
+		perror("While initializing command history");
+		return 1;
+	}
+	history(hist, &ev, H_SETSIZE, 800);
+	el_set(el, EL_HIST, history, hist);
+
+	char *hist_file = NULL;
+
+	char *data_home = getenv("XDG_DATA_HOME");
+
+	//Check whether $XDG_DATA_HOME is set.
+	if (!data_home || *data_home == '\0') {
+		const char *home = getenv("HOME");	//This should be set on any POSIX compliant OS, even for nobody
+
+		//Create necessary folders.
+		char *dirs[3] =
+		    { afmt("%s/.local", home), afmt("%s/.local/share", home),
+			afmt("%s/.local/share/knot-resolver/", home)
+		};
+		bool ok = true;
+		for (int i = 0; i < 3; i++) {
+			if (mkdir(dirs[i], 0755) && errno != EEXIST) {
+				ok = false;
+				break;
+			}
+		}
+		if (ok) {
+			hist_file =
+			    afmt("%s/.local/share/knot-resolver/" HISTORY_FILE, home);
+		}
+	} else {
+		if (!mkdir(afmt("%s/knot-resolver/", data_home), 0755)
+		    || errno == EEXIST) {
+			hist_file = afmt("%s/knot-resolver/" HISTORY_FILE, data_home);
+		}
+	}
+
+	//Load history file
+	if (hist_file) {
+		history(hist, &ev, H_LOAD, hist_file);
+	} else {
+		perror("While opening history file");
+	}
+
+	while (1) {
+		line = el_gets(el, &count);
+		if (count > 0) {
+			history(hist, &ev, H_ENTER, line);
+			size_t msg_len;
+			char *msg = run_cmd(line, &msg_len);
+			if (!msg) {
+				perror("While communication with daemon");
+				history_end(hist);
+				el_end(el);
+				free(msg);
+				return 1;
+			}
+			printf("%s", msg);
+			if (msg_len > 0 && msg[msg_len - 1] != '\n') {
+				printf("\n");
+			}
+			if (hist_file) {
+				history(hist, &ev, H_SAVE, hist_file);
+			}
+			free(msg);
+		}
+	}
+	history_end(hist);
+	free(hist_file);
+	el_end(el);
+	if (feof(stdin))
+		return 0;
+	perror("While reading input");
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	fprintf(stderr, "Warning! %s is highly experimental, use at own risk.\n", argv[0]);
+	fprintf(stderr, "Please tell authors what features you expect from client utility.\n");
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s tty/xxxxx\n", argv[0]);
+		return 1;
+	}
+
+	int res = init_tty(argv[1]);
+
+	if (!res)
+		res = interact();
+
+	if (g_tty)
+		fclose(g_tty);
+	return res;
+}