src/log/main.c

/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "lib-signals.h"
#include "hostpid.h"
#include "restrict-access.h"
#include "master-interface.h"
#include "master-service-private.h"
#include "master-service-settings.h"
#include "log-error-buffer.h"
#include "log-connection.h"
#include "doveadm-connection.h"

#include <unistd.h>

bool verbose_proctitle;
char *global_log_prefix;
static struct log_error_buffer *errorbuf;

static void
sig_reopen_logs(const siginfo_t *si ATTR_UNUSED, void *context ATTR_UNUSED)
{
    master_service->log_initialized = FALSE;
    master_service_init_log(master_service, global_log_prefix);
}

static void main_init(void)
{
    lib_signals_set_handler(SIGUSR1, LIBSIG_FLAGS_SAFE,
                sig_reopen_logs, NULL);

    errorbuf = log_error_buffer_init();
    log_connections_init();
}

static void main_deinit(void)
{
    log_connections_deinit();
    log_error_buffer_deinit(&errorbuf);
    i_free(global_log_prefix);
}

static void client_connected(struct master_service_connection *conn)
{
    if (conn->fifo) {
        log_connection_create(errorbuf, conn->fd, conn->listen_fd);
        /* kludge: normally FIFOs aren't counted as connections,
           but here we want log process to stay open until all writers
           have closed */
        conn->fifo = FALSE;
    } else if (strcmp(conn->name, "log-errors") == 0)
        doveadm_connection_create(errorbuf, conn->fd);
    else {
        i_error("Unknown listener name: %s", conn->name);
        return;
    }

    master_service_client_connection_accept(conn);
}

int main(int argc, char *argv[])
{
    const char *error;

    master_service = master_service_init("log", 0, &argc, &argv, "");

    /* use log prefix and log to stderr until we've configured the real
       logging */
    global_log_prefix = i_strdup_printf("log(%s): ", my_pid);
    i_set_failure_file("/dev/stderr", global_log_prefix);

    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, global_log_prefix);

    verbose_proctitle = master_service_settings_get(master_service)->verbose_proctitle;

    restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
    restrict_access_allow_coredumps(TRUE);

    /* logging should never die if there are some clients */
    master_service_set_die_with_master(master_service, FALSE);

    main_init();
    master_service_init_finish(master_service);
    master_service_run(master_service, client_connected);
    main_deinit();
    master_service_deinit(&master_service);
        return 0;
}