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/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "ioloop.h"
#include "net.h"
#include "istream.h"
#include "ostream.h"
#include "hostpid.h"
#include "master-service.h"
#include "ipc-server.h"
#include <unistd.h>
#define IPC_SERVER_RECONNECT_MSECS (10*1000)
#define IPC_SERVER_PROTOCOL_MAJOR_VERSION 1
#define IPC_SERVER_PROTOCOL_MINOR_VERSION 0
#define IPC_SERVER_HANDSHAKE "VERSION\tipc-server\t1\t0\nHANDSHAKE\t%s\t%s\n"
struct ipc_cmd {
struct ipc_server *server;
unsigned int tag;
};
struct ipc_server {
char *name, *path;
ipc_command_callback_t *callback;
int ipc_cmd_refcount;
int fd;
struct io *io;
struct timeout *to;
struct istream *input;
struct ostream *output;
bool version_received:1;
};
static void ipc_server_disconnect(struct ipc_server *server);
static void ipc_server_connect(struct ipc_server *server);
static void ipc_server_input_line(struct ipc_server *server, char *line)
{
struct ipc_cmd *cmd;
unsigned int tag = 0;
char *p;
/* tag cmd */
p = strchr(line, '\t');
if (p != NULL) {
*p++ = '\0';
if (str_to_uint(line, &tag) < 0)
p = NULL;
}
if (p == NULL || *p == '\0') {
i_error("IPC proxy sent invalid input: %s", line);
return;
}
cmd = i_new(struct ipc_cmd, 1);
cmd->server = server;
cmd->tag = tag;
server->ipc_cmd_refcount++;
T_BEGIN {
server->callback(cmd, p);
} T_END;
}
static void ipc_server_input(struct ipc_server *server)
{
char *line;
if (i_stream_read(server->input) < 0) {
ipc_server_disconnect(server);
ipc_server_connect(server);
return;
}
if (!server->version_received) {
if ((line = i_stream_next_line(server->input)) == NULL)
return;
if (!version_string_verify(line, "ipc-proxy",
IPC_SERVER_PROTOCOL_MAJOR_VERSION)) {
i_error("IPC proxy not compatible with this server "
"(mixed old and new binaries?)");
ipc_server_disconnect(server);
return;
}
server->version_received = TRUE;
}
while ((line = i_stream_next_line(server->input)) != NULL)
ipc_server_input_line(server, line);
}
static void ipc_server_connect(struct ipc_server *server)
{
i_assert(server->fd == -1);
timeout_remove(&server->to);
server->fd = net_connect_unix(server->path);
if (server->fd == -1) {
i_error("connect(%s) failed: %m", server->path);
server->to = timeout_add(IPC_SERVER_RECONNECT_MSECS,
ipc_server_connect, server);
return;
}
server->io = io_add(server->fd, IO_READ, ipc_server_input, server);
server->input = i_stream_create_fd(server->fd, SIZE_MAX);
server->output = o_stream_create_fd(server->fd, SIZE_MAX);
o_stream_set_no_error_handling(server->output, TRUE);
o_stream_nsend_str(server->output,
t_strdup_printf(IPC_SERVER_HANDSHAKE, server->name, my_pid));
o_stream_cork(server->output);
}
static void ipc_server_disconnect(struct ipc_server *server)
{
if (server->fd == -1)
return;
io_remove(&server->io);
i_stream_destroy(&server->input);
o_stream_destroy(&server->output);
if (close(server->fd) < 0)
i_error("close(%s) failed: %m", server->path);
server->fd = -1;
}
struct ipc_server *
ipc_server_init(const char *ipc_socket_path, const char *name,
ipc_command_callback_t *callback)
{
struct ipc_server *server;
server = i_new(struct ipc_server, 1);
server->name = i_strdup(name);
server->path = i_strdup(ipc_socket_path);
server->callback = callback;
server->fd = -1;
ipc_server_connect(server);
return server;
}
void ipc_server_deinit(struct ipc_server **_server)
{
struct ipc_server *server = *_server;
*_server = NULL;
i_assert(server->ipc_cmd_refcount == 0);
ipc_server_disconnect(server);
timeout_remove(&server->to);
i_free(server->name);
i_free(server->path);
i_free(server);
}
void ipc_cmd_send(struct ipc_cmd *cmd, const char *data)
{
o_stream_nsend_str(cmd->server->output,
t_strdup_printf("%u\t:%s\n", cmd->tag, data));
}
static void ipc_cmd_finish(struct ipc_cmd *cmd, const char *line)
{
o_stream_nsend_str(cmd->server->output,
t_strdup_printf("%u\t%s\n", cmd->tag, line));
o_stream_uncork(cmd->server->output);
i_assert(cmd->server->ipc_cmd_refcount > 0);
cmd->server->ipc_cmd_refcount--;
i_free(cmd);
}
void ipc_cmd_success(struct ipc_cmd **_cmd)
{
ipc_cmd_success_reply(_cmd, "");
}
void ipc_cmd_success_reply(struct ipc_cmd **_cmd, const char *data)
{
struct ipc_cmd *cmd = *_cmd;
*_cmd = NULL;
ipc_cmd_finish(cmd, t_strconcat("+", data, NULL));
}
void ipc_cmd_fail(struct ipc_cmd **_cmd, const char *errormsg)
{
struct ipc_cmd *cmd = *_cmd;
i_assert(errormsg != NULL);
*_cmd = NULL;
ipc_cmd_finish(cmd, t_strconcat("-", errormsg, NULL));
}
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