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#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#define LIBNAME "client"
#ifndef VERSION
#define VERSION "(unknown)"
#endif
#ifndef DEFAULT_SOCKET_PATH
#define DEFAULT_SOCKET_PATH "/var/run/privsep/root.sock"
#endif
#define BUFSIZE 32768
static int pusherror(lua_State *L, const char *info)
{
lua_pushnil(L);
if (info == NULL)
lua_pushstring(L, strerror(errno));
else
lua_pushfstring(L, "%s: %s", info, strerror(errno));
lua_pushinteger(L, errno);
return 3;
}
static int Pconnect(lua_State *L)
{
const char *socket_path = luaL_optstring(L, 1, DEFAULT_SOCKET_PATH);
struct sockaddr_un sun;
int fd, ret;
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strncpy(sun.sun_path, socket_path, sizeof(sun.sun_path));
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return pusherror(L, "socket");
if (connect(fd, (struct sockaddr *) &sun, sizeof(sun)) < 0) {
ret = pusherror(L, socket_path);
goto close_err;
}
lua_pushinteger(L, fd);
return 1;
close_err:
close(fd);
return ret;
}
static int push_err_or_int(lua_State *L, ssize_t n)
{
if (n < 0)
return pusherror(L, NULL);
lua_pushinteger(L, n);
return 1;
}
static int Pwrite(lua_State *L)
{
int fd = luaL_checkinteger(L, 1);
size_t len = 0;
const char *msg = luaL_checklstring(L, 2, &len);
return push_err_or_int(L, write(fd, msg, len));
}
static int Precv(lua_State *L)
{
int fd = luaL_checkinteger(L, 1);
static char buf[BUFSIZE];
ssize_t n = recv(fd, buf, sizeof(buf), 0);
if (n < 0)
return pusherror(L, NULL);
lua_pushlstring(L, buf, n);
return 1;
}
static int Pclose(lua_State *L)
{
int fd = luaL_checkinteger(L, 1);
return push_err_or_int(L, close(fd));
}
static const luaL_reg reg_client_methods[] = {
{"connect", Pconnect},
{"write", Pwrite},
{"recv", Precv},
{"close", Pclose},
{NULL, NULL},
};
LUALIB_API int luaopen_client(lua_State *L)
{
luaL_register(L, LIBNAME, reg_client_methods);
lua_pushliteral(L, "version");
lua_pushliteral(L, VERSION);
lua_settable(L, -3);
return 1;
}
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