src/anvil/main.c

/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */

#include "common.h"
#include "array.h"
#include "env-util.h"
#include "fdpass.h"
#include "ioloop.h"
#include "restrict-access.h"
#include "master-service.h"
#include "master-service-settings.h"
#include "master-interface.h"
#include "connect-limit.h"
#include "penalty.h"
#include "anvil-connection.h"

#include <unistd.h>

struct connect_limit *connect_limit;
struct penalty *penalty;
bool anvil_restarted;
static struct io *log_fdpass_io;

static void client_connected(struct master_service_connection *conn)
{
    bool master = conn->listen_fd == MASTER_LISTEN_FD_FIRST;

    master_service_client_connection_accept(conn);
    (void)anvil_connection_create(conn->fd, master, conn->fifo);
}

static void ATTR_NULL(1)
log_fdpass_input(void *context ATTR_UNUSED)
{
    int fd;
    char c;
    ssize_t ret;

    /* master wants us to replace the log fd */
    ret = fd_read(MASTER_ANVIL_LOG_FDPASS_FD, &c, 1, &fd);
    if (ret < 0)
        i_error("fd_read(log fd) failed: %m");
    else if (ret == 0) {
        /* master died. lib-master should notice it soon. */
        io_remove(&log_fdpass_io);
    } else {
        if (dup2(fd, STDERR_FILENO) < 0)
            i_fatal("dup2(fd_read  log fd, stderr) failed: %m");
        if (close(fd) < 0)
            i_error("close(fd_read log fd) failed: %m");
    }
}

int main(int argc, char *argv[])
{
    const enum master_service_flags service_flags =
        MASTER_SERVICE_FLAG_UPDATE_PROCTITLE;
    const char *error;

    master_service = master_service_init("anvil", service_flags,
                         &argc, &argv, "");
    if (master_getopt(master_service) > 0)
        return FATAL_DEFAULT;
    if (master_service_settings_read_simple(master_service,
                        NULL, &error) < 0)
        i_fatal("Error reading configuration: %s", error);
    master_service_init_log(master_service, "anvil: ");

    restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
    restrict_access_allow_coredumps(TRUE);
    anvil_restarted = getenv("ANVIL_RESTARTED") != NULL;

    /* delay dying until all of our clients are gone */
    master_service_set_die_with_master(master_service, FALSE);

    connect_limit = connect_limit_init();
    penalty = penalty_init();
    log_fdpass_io = io_add(MASTER_ANVIL_LOG_FDPASS_FD, IO_READ,
                   log_fdpass_input, NULL);
    master_service_init_finish(master_service);

    master_service_run(master_service, client_connected);

    io_remove(&log_fdpass_io);
    penalty_deinit(&penalty);
    connect_limit_deinit(&connect_limit);
    anvil_connections_destroy_all();
    master_service_deinit(&master_service);
        return 0;
}