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/* Copyright (c) 2011-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "ioloop.h"
#include "istream.h"
#include "ostream.h"
#include "llist.h"
#include "strescape.h"
#include "master-service.h"
#include "ipc-group.h"
#include "ipc-connection.h"
#include <unistd.h>
#define IPC_SERVER_PROTOCOL_MAJOR_VERSION 1
#define IPC_SERVER_PROTOCOL_MINOR_VERSION 0
#define IPC_SERVER_HANDSHAKE "VERSION\tipc-proxy\t1\t0\n"
static unsigned int connection_id_counter;
static void ipc_connection_cmd_free(struct ipc_connection_cmd **_cmd,
const char *reason)
{
struct ipc_connection_cmd *cmd = *_cmd;
struct ipc_connection_cmd **cmds;
unsigned int i, count;
*_cmd = NULL;
cmds = array_get_modifiable(&cmd->conn->cmds, &count);
for (i = 0; i < count; i++) {
if (cmds[i] == cmd) {
array_delete(&cmd->conn->cmds, i, 1);
break;
}
}
if (cmd->callback != NULL) {
i_assert(reason != NULL);
cmd->callback(IPC_CMD_STATUS_ERROR, reason, cmd->context);
}
i_free(cmd);
}
static struct ipc_connection_cmd *
ipc_connection_cmd_find(struct ipc_connection *conn, unsigned int tag)
{
struct ipc_connection_cmd *cmd;
array_foreach_elem(&conn->cmds, cmd) {
if (cmd->tag == tag)
return cmd;
}
return NULL;
}
static int
ipc_connection_input_line(struct ipc_connection *conn, char *line)
{
struct ipc_connection_cmd *cmd;
unsigned int tag;
enum ipc_cmd_status status;
char *data;
/* <tag> [:+-]<data> */
data = strchr(line, '\t');
if (data == NULL)
return -1;
*data++ = '\0';
if (str_to_uint(line, &tag) < 0)
return -1;
switch (data[0]) {
case ':':
status = IPC_CMD_STATUS_REPLY;
break;
case '+':
status = IPC_CMD_STATUS_OK;
break;
case '-':
status = IPC_CMD_STATUS_ERROR;
break;
default:
return -1;
}
data++;
cmd = ipc_connection_cmd_find(conn, tag);
if (cmd == NULL) {
i_error("IPC server: Input for unexpected command tag %u", tag);
return 0;
}
cmd->callback(status, data, cmd->context);
if (status != IPC_CMD_STATUS_REPLY) {
cmd->callback = NULL;
ipc_connection_cmd_free(&cmd, NULL);
}
return 0;
}
static void ipc_connection_input(struct ipc_connection *conn)
{
const char *const *args;
char *line;
int ret;
if (i_stream_read(conn->input) < 0) {
ipc_connection_destroy(&conn, FALSE,
i_stream_get_disconnect_reason(conn->input));
return;
}
if (!conn->version_received) {
if ((line = i_stream_next_line(conn->input)) == NULL)
return;
if (!version_string_verify(line, "ipc-server",
IPC_SERVER_PROTOCOL_MAJOR_VERSION)) {
ipc_connection_destroy(&conn, TRUE,
"IPC server not compatible with this server "
"(mixed old and new binaries?)");
return;
}
conn->version_received = TRUE;
}
if (!conn->handshake_received) {
if ((line = i_stream_next_line(conn->input)) == NULL)
return;
args = t_strsplit_tabescaped(line);
if (str_array_length(args) < 3 ||
strcmp(args[0], "HANDSHAKE") != 0) {
ipc_connection_destroy(&conn, TRUE,
"IPC server sent invalid handshake");
return;
}
if (ipc_group_update_name(conn->group, args[1]) < 0) {
ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
"IPC server named itself unexpectedly: %s "
"(existing ones were %s)",
args[1], conn->group->name));
return;
}
if (str_to_pid(args[2], &conn->pid) < 0) {
ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
"IPC server gave broken PID: %s", args[2]));
return;
}
conn->handshake_received = TRUE;
}
while ((line = i_stream_next_line(conn->input)) != NULL) {
T_BEGIN {
ret = ipc_connection_input_line(conn, line);
} T_END;
if (ret < 0) {
ipc_connection_destroy(&conn, TRUE, t_strdup_printf(
"Invalid input from IPC server '%s': %s",
conn->group->name, line));
break;
}
}
}
struct ipc_connection *ipc_connection_create(int listen_fd, int fd)
{
struct ipc_connection *conn;
conn = i_new(struct ipc_connection, 1);
conn->group = ipc_group_lookup_listen_fd(listen_fd);
if (conn->group == NULL)
conn->group = ipc_group_alloc(listen_fd);
conn->id = ++connection_id_counter;
if (conn->id == 0)
conn->id = ++connection_id_counter;
conn->fd = fd;
conn->io = io_add(fd, IO_READ, ipc_connection_input, conn);
conn->input = i_stream_create_fd(fd, SIZE_MAX);
conn->output = o_stream_create_fd(fd, SIZE_MAX);
o_stream_set_no_error_handling(conn->output, TRUE);
i_array_init(&conn->cmds, 8);
o_stream_nsend_str(conn->output, IPC_SERVER_HANDSHAKE);
DLLIST_PREPEND(&conn->group->connections, conn);
return conn;
}
void ipc_connection_destroy(struct ipc_connection **_conn,
bool log_error, const char *error)
{
struct ipc_connection *conn = *_conn;
struct ipc_connection_cmd *const *cmdp, *cmd;
const char *group_name = conn->group->name != NULL ?
conn->group->name :
t_strdup_printf("#%d", conn->group->listen_fd);
*_conn = NULL;
error = t_strdup_printf("IPC: '%s' PID %d server connection: %s",
group_name, conn->pid, error);
if (log_error)
i_error("%s", error);
DLLIST_REMOVE(&conn->group->connections, conn);
while (array_count(&conn->cmds) > 0) {
cmdp = array_front(&conn->cmds);
cmd = *cmdp;
ipc_connection_cmd_free(&cmd, error);
}
array_free(&conn->cmds);
io_remove(&conn->io);
i_stream_destroy(&conn->input);
o_stream_destroy(&conn->output);
if (close(conn->fd) < 0)
i_error("close(ipc connection) failed: %m");
i_free(conn);
master_service_client_connection_destroyed(master_service);
}
struct ipc_connection *
ipc_connection_lookup_id(struct ipc_group *group, unsigned int id)
{
struct ipc_connection *conn;
for (conn = group->connections; conn != NULL; conn = conn->next) {
if (conn->id == id)
return conn;
}
return NULL;
}
void ipc_connection_cmd(struct ipc_connection *conn, const char *cmd,
ipc_cmd_callback_t *callback, void *context)
{
struct ipc_connection_cmd *ipc_cmd;
ipc_cmd = i_new(struct ipc_connection_cmd, 1);
ipc_cmd->tag = ++conn->cmd_tag_counter;
ipc_cmd->conn = conn;
ipc_cmd->callback = callback;
ipc_cmd->context = context;
array_push_back(&conn->cmds, &ipc_cmd);
T_BEGIN {
o_stream_nsend_str(conn->output,
t_strdup_printf("%u\t%s\n", ipc_cmd->tag, cmd));
} T_END;
}
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