Commit 3780220d authored by Vladimír Čunát's avatar Vladimír Čunát Committed by Štěpán Balážik

kresc: add a mock-up of the client

The build system is prepared for libedit.
parent 8d7e4262
......@@ -2,10 +2,11 @@ include
# Targets
all: info lib daemon modules
install: lib-install daemon-install modules-install etc-install
all: info lib daemon client modules
install: lib-install daemon-install client-install modules-install etc-install
check: all tests
clean: contrib-clean lib-clean daemon-clean modules-clean tests-clean doc-clean bench-clean
clean: contrib-clean lib-clean daemon-clean client-clean modules-clean \
tests-clean doc-clean bench-clean
doc: doc-html
.PHONY: all install check clean doc info
......@@ -33,6 +34,7 @@ $(eval $(call find_lib,hiredis,,yes))
$(eval $(call find_lib,socket_wrapper))
$(eval $(call find_lib,libsystemd,227))
$(eval $(call find_lib,gnutls))
$(eval $(call find_lib,libedit))
# Lookup SONAME
$(eval $(call find_soname,libknot))
......@@ -109,6 +111,7 @@ info:
$(info [$(HAS_nettle)] nettle (modules/cookies))
$(info [$(HAS_ltn12)] Lua socket ltn12 (trust anchor bootstrapping))
$(info [$(HAS_ssl.https)] Lua ssl.https (trust anchor bootstrapping))
$(info [$(HAS_libedit)] libedit (client))
$(info )
# Verify required dependencies are met, as listed above
......@@ -58,4 +58,15 @@ daemon/lua/kres-gen.lua: | $(libkres)
daemon/lua/ > $@
.DELETE_ON_ERROR: daemon/lua/kres-gen.lua
.PHONY: daemon daemon-install daemon-clean
# Client
ifeq ($(HAS_libedit), yes)
kresc_SOURCES := daemon/kresc.c
kresc_CFLAGS += -fPIE $(libedit_CFLAGS)
kresc_LIBS += $(libedit_LIBS)
$(eval $(call make_sbin,kresc,daemon,yes))
client: $(kresc)
client-install: kresc-install
client-clean: kresc-clean
.PHONY: daemon daemon-install daemon-clean client client-install client-clean
\ No newline at end of file
/* Copyright (C) 2016 CZ.NIC, z.s.p.o. <>
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
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 <>.
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
FILE *g_tty = NULL; //!< connection to the daemon
//! 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");
return 1;
memcpy(addr.sun_path, path, plen + 1);
if (connect(fd, (const struct sockaddr *)&addr, sizeof(addr))) {
perror("While connecting to daemon");
return 1;
g_tty = fdopen(fd, "r+");
if (!g_tty) {
perror("While opening TTY");
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");
return 1;
return 0;
//! Run a command on the daemon; return the answer or NULL on failure.
static char *run_cmd(const char *cmd)
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;
char *msg = malloc(len);
if (!msg)
return NULL;
if (!fread(msg, len, 1, g_tty)) {
return NULL;
return msg;
//! Prototype; TODO: editline.
static int interact()
char *buf = NULL;
size_t buf_len = 0;
ssize_t len;
while (getline(&buf, &buf_len, stdin) >= 0) {
char *msg = run_cmd(buf);
if (!msg) {
perror("While communication with daemon");
return 1;
printf("%s", msg);
if (feof(stdin))
return 0;
perror("While reading input");
return 1;
int main(int argc, char **argv)
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)
return res;
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