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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 "llist.h"
#include "istream.h"
#include "ostream.h"
#include "hostpid.h"
#include "master-service.h"
#include "ipc-client.h"
#include <unistd.h>
struct ipc_client_cmd {
struct ipc_client_cmd *prev, *next;
ipc_client_callback_t *callback;
void *context;
};
struct ipc_client {
char *path;
ipc_client_callback_t *callback;
int fd;
struct io *io;
struct timeout *to_failed;
struct istream *input;
struct ostream *output;
struct ipc_client_cmd *cmds_head, *cmds_tail;
unsigned int aborted_cmds_count;
};
static void ipc_client_disconnect(struct ipc_client *client);
static void ipc_client_input_line(struct ipc_client *client, const char *line)
{
struct ipc_client_cmd *cmd = client->cmds_head;
enum ipc_client_cmd_state state;
bool disconnect = FALSE;
if (client->aborted_cmds_count > 0) {
/* the command was already aborted */
cmd = NULL;
} else if (cmd == NULL) {
i_error("IPC proxy sent unexpected input: %s", line);
return;
}
switch (*line++) {
case ':':
state = IPC_CLIENT_CMD_STATE_REPLY;
break;
case '+':
state = IPC_CLIENT_CMD_STATE_OK;
break;
case '-':
state = IPC_CLIENT_CMD_STATE_ERROR;
break;
default:
i_error("IPC proxy sent invalid input: %s", line);
line = "Invalid input";
disconnect = TRUE;
state = IPC_CLIENT_CMD_STATE_ERROR;
break;
}
if (state != IPC_CLIENT_CMD_STATE_REPLY) {
if (cmd != NULL)
DLLIST2_REMOVE(&client->cmds_head,
&client->cmds_tail, cmd);
else
client->aborted_cmds_count--;
}
if (cmd != NULL)
cmd->callback(state, line, cmd->context);
if (state != IPC_CLIENT_CMD_STATE_REPLY)
i_free(cmd);
if (disconnect)
ipc_client_disconnect(client);
}
static void ipc_client_input(struct ipc_client *client)
{
const char *line;
if (i_stream_read(client->input) < 0) {
ipc_client_disconnect(client);
return;
}
while ((line = i_stream_next_line(client->input)) != NULL) T_BEGIN {
ipc_client_input_line(client, line);
} T_END;
}
static int ipc_client_connect(struct ipc_client *client)
{
if (client->fd != -1)
return 0;
client->fd = net_connect_unix(client->path);
if (client->fd == -1) {
i_error("connect(%s) failed: %m", client->path);
return -1;
}
client->io = io_add(client->fd, IO_READ, ipc_client_input, client);
client->input = i_stream_create_fd(client->fd, SIZE_MAX);
client->output = o_stream_create_fd(client->fd, SIZE_MAX);
o_stream_set_no_error_handling(client->output, TRUE);
return 0;
}
static void ipc_client_abort_commands(struct ipc_client *client,
const char *reason)
{
struct ipc_client_cmd *cmd, *next;
cmd = client->cmds_head;
client->cmds_head = client->cmds_tail = NULL;
for (; cmd != NULL; cmd = next) {
cmd->callback(IPC_CLIENT_CMD_STATE_ERROR, reason, cmd->context);
next = cmd->next;
i_free(cmd);
}
}
static void ipc_client_disconnect(struct ipc_client *client)
{
timeout_remove(&client->to_failed);
ipc_client_abort_commands(client, "Disconnected");
if (client->fd == -1)
return;
io_remove(&client->io);
i_stream_destroy(&client->input);
o_stream_destroy(&client->output);
if (close(client->fd) < 0)
i_error("close(%s) failed: %m", client->path);
client->fd = -1;
}
struct ipc_client *
ipc_client_init(const char *ipc_socket_path)
{
struct ipc_client *client;
client = i_new(struct ipc_client, 1);
client->path = i_strdup(ipc_socket_path);
client->fd = -1;
return client;
}
void ipc_client_deinit(struct ipc_client **_client)
{
struct ipc_client *client = *_client;
*_client = NULL;
ipc_client_disconnect(client);
i_free(client->path);
i_free(client);
}
static void ipc_client_cmd_connect_failed(struct ipc_client *client)
{
ipc_client_abort_commands(client, "ipc connect failed");
timeout_remove(&client->to_failed);
}
struct ipc_client_cmd *
ipc_client_cmd(struct ipc_client *client, const char *cmd,
ipc_client_callback_t *callback, void *context)
{
struct ipc_client_cmd *ipc_cmd;
struct const_iovec iov[2];
ipc_cmd = i_new(struct ipc_client_cmd, 1);
ipc_cmd->callback = callback;
ipc_cmd->context = context;
DLLIST2_APPEND(&client->cmds_head, &client->cmds_tail, ipc_cmd);
if (client->to_failed != NULL ||
ipc_client_connect(client) < 0) {
/* Delay calling the failure callback. Fail all commands until
the callback is called. */
if (client->to_failed == NULL) {
client->to_failed = timeout_add_short(0,
ipc_client_cmd_connect_failed, client);
}
} else {
iov[0].iov_base = cmd;
iov[0].iov_len = strlen(cmd);
iov[1].iov_base = "\n";
iov[1].iov_len = 1;
o_stream_nsendv(client->output, iov, N_ELEMENTS(iov));
}
return ipc_cmd;
}
void ipc_client_cmd_abort(struct ipc_client *client,
struct ipc_client_cmd **_cmd)
{
struct ipc_client_cmd *cmd = *_cmd;
*_cmd = NULL;
cmd->callback = NULL;
/* Free the command only if it's the oldest. Free also other such
commands in case they were aborted earlier. */
while (client->cmds_head != NULL &&
client->cmds_head->callback == NULL) {
struct ipc_client_cmd *head = client->cmds_head;
client->aborted_cmds_count++;
DLLIST2_REMOVE(&client->cmds_head, &client->cmds_tail, head);
i_free(head);
}
}
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