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/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
#include "common.h"
#include "ioloop.h"
#include "fdpass.h"
#include "service.h"
#include "service-process.h"
#include "service-process-notify.h"
#include "service-anvil.h"
#include <unistd.h>
#define ANVIL_HANDSHAKE "VERSION\tanvil\t1\t0\n"
struct service_anvil_global *service_anvil_global;
static void
service_list_anvil_discard_input_stop(struct service_anvil_global *anvil)
{
if (anvil->io_blocking != NULL) {
io_remove(&anvil->io_blocking);
io_remove(&anvil->io_nonblocking);
}
}
static void anvil_input_fd_discard(struct service_anvil_global *anvil, int fd)
{
char buf[1024];
ssize_t ret;
ret = read(fd, buf, sizeof(buf));
if (ret <= 0) {
i_error("read(anvil fd) failed: %m");
service_list_anvil_discard_input_stop(anvil);
}
}
static void anvil_input_blocking_discard(struct service_anvil_global *anvil)
{
anvil_input_fd_discard(anvil, anvil->blocking_fd[0]);
}
static void anvil_input_nonblocking_discard(struct service_anvil_global *anvil)
{
anvil_input_fd_discard(anvil, anvil->nonblocking_fd[0]);
}
static void service_list_anvil_discard_input(struct service_anvil_global *anvil)
{
if (anvil->io_blocking != NULL)
return;
anvil->io_blocking = io_add(anvil->blocking_fd[0], IO_READ,
anvil_input_blocking_discard, anvil);
anvil->io_nonblocking = io_add(anvil->nonblocking_fd[0], IO_READ,
anvil_input_nonblocking_discard, anvil);
}
static int anvil_send_handshake(int fd, const char **error_r)
{
ssize_t ret;
ret = write(fd, ANVIL_HANDSHAKE, strlen(ANVIL_HANDSHAKE));
if (ret < 0) {
*error_r = t_strdup_printf("write(anvil) failed: %m");
return -1;
}
if (ret == 0) {
*error_r = t_strdup_printf("write(anvil) returned EOF");
return -1;
}
/* this is a pipe, it either wrote all of it or nothing */
i_assert((size_t)ret == strlen(ANVIL_HANDSHAKE));
return 0;
}
static int
service_process_write_anvil_kill(int fd, struct service_process *process)
{
const char *data;
data = t_strdup_printf("KILL\t%s\n", dec2str(process->pid));
if (write(fd, data, strlen(data)) < 0) {
if (errno != EAGAIN)
i_error("write(anvil process) failed: %m");
return -1;
}
return 0;
}
void service_anvil_monitor_start(struct service_list *service_list)
{
struct service *service;
if (service_anvil_global->process_count == 0)
service_list_anvil_discard_input(service_anvil_global);
else {
service = service_lookup_type(service_list, SERVICE_TYPE_ANVIL);
(void)service_process_create(service);
}
}
void service_anvil_process_created(struct service_process *process)
{
struct service_anvil_global *anvil = service_anvil_global;
const char *error;
service_anvil_global->pid = process->pid;
service_anvil_global->uid = process->uid;
service_anvil_global->process_count++;
service_list_anvil_discard_input_stop(anvil);
if (anvil_send_handshake(anvil->blocking_fd[1], &error) < 0 ||
anvil_send_handshake(anvil->nonblocking_fd[1], &error) < 0)
service_error(process->service, "%s", error);
}
void service_anvil_process_destroyed(struct service_process *process)
{
i_assert(service_anvil_global->process_count > 0);
if (--service_anvil_global->process_count == 0)
service_list_anvil_discard_input(service_anvil_global);
if (service_anvil_global->pid == process->pid)
service_anvil_global->pid = 0;
service_anvil_global->restarted = TRUE;
}
void service_anvil_send_log_fd(void)
{
ssize_t ret;
char b = 0;
if (service_anvil_global->process_count == 0)
return;
ret = fd_send(service_anvil_global->log_fdpass_fd[1],
services->anvil->log_fd[1], &b, 1);
if (ret < 0)
i_error("fd_send(anvil log fd) failed: %m");
else if (ret == 0)
i_error("fd_send(anvil log fd) failed: disconnected");
}
void service_anvil_global_init(void)
{
struct service_anvil_global *anvil;
anvil = i_new(struct service_anvil_global, 1);
if (pipe(anvil->status_fd) < 0)
i_fatal("pipe() failed: %m");
if (pipe(anvil->blocking_fd) < 0)
i_fatal("pipe() failed: %m");
if (pipe(anvil->nonblocking_fd) < 0)
i_fatal("pipe() failed: %m");
if (socketpair(AF_UNIX, SOCK_STREAM, 0, anvil->log_fdpass_fd) < 0)
i_fatal("socketpair() failed: %m");
fd_set_nonblock(anvil->status_fd[0], TRUE);
fd_set_nonblock(anvil->status_fd[1], TRUE);
fd_set_nonblock(anvil->nonblocking_fd[1], TRUE);
fd_close_on_exec(anvil->status_fd[0], TRUE);
fd_close_on_exec(anvil->status_fd[1], TRUE);
fd_close_on_exec(anvil->blocking_fd[0], TRUE);
fd_close_on_exec(anvil->blocking_fd[1], TRUE);
fd_close_on_exec(anvil->nonblocking_fd[0], TRUE);
fd_close_on_exec(anvil->nonblocking_fd[1], TRUE);
fd_close_on_exec(anvil->log_fdpass_fd[0], TRUE);
fd_close_on_exec(anvil->log_fdpass_fd[1], TRUE);
anvil->kills =
service_process_notify_init(anvil->nonblocking_fd[1],
service_process_write_anvil_kill);
service_anvil_global = anvil;
}
void service_anvil_global_deinit(void)
{
struct service_anvil_global *anvil = service_anvil_global;
service_list_anvil_discard_input_stop(anvil);
service_process_notify_deinit(&anvil->kills);
if (close(anvil->log_fdpass_fd[0]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->log_fdpass_fd[1]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->blocking_fd[0]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->blocking_fd[1]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->nonblocking_fd[0]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->nonblocking_fd[1]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->status_fd[0]) < 0)
i_error("close(anvil) failed: %m");
if (close(anvil->status_fd[1]) < 0)
i_error("close(anvil) failed: %m");
i_free(anvil);
service_anvil_global = NULL;
}
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