src/master/main.c

	main.c revision 7013075e208bc7aa87257df7d9664c84c7c220f3
/* Copyright (C) 2002 Timo Sirainen */

#include "common.h"
#include "ioloop.h"
#include "lib-signals.h"
#include "network.h"
#include "env-util.h"
#include "fd-close-on-exec.h"

#include "auth-process.h"
#include "login-process.h"
#include "imap-process.h"
#include "ssl-init.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/wait.h>

const char *process_names[PROCESS_TYPE_MAX] = {
    "unknown",
    "auth",
    "login",
    "imap",
    "ssl-param"
};

static const char *configfile = SYSCONFDIR "/" PACKAGE ".conf";
static struct timeout *to;

struct ioloop *ioloop;
struct hash_table *pids;
int null_fd, imap_fd, imaps_fd;

int validate_str(const char *str, size_t max_len)
{
    size_t i;

    for (i = 0; i < max_len; i++) {
        if (str[i] == '\0')
            return TRUE;
    }

    return FALSE;
}

void clean_child_process(void)
{
    /* remove all environment, we don't need them */
    env_clean();

    /* set the failure log */
    if (set_log_path == NULL)
        env_put("IMAP_USE_SYSLOG=1");
    else
        env_put(t_strconcat("IMAP_LOGFILE=", set_log_path, NULL));

    if (set_info_log_path != NULL) {
        env_put(t_strconcat("IMAP_INFOLOGFILE=",
                    set_info_log_path, NULL));
    }

    if (set_log_timestamp != NULL)
        env_put(t_strconcat("IMAP_LOGSTAMP=", set_log_timestamp, NULL));
}

static void sig_quit(int signo __attr_unused__)
{
    io_loop_stop(ioloop);
}

static void settings_reload(void)
{
    i_warning("SIGHUP received - reloading configuration");

    settings_read(configfile);

    /* restart auth and login processes */
        login_processes_destroy_all();
        auth_processes_destroy_all();
}

static const char *get_exit_status_message(enum fatal_exit_status status)
{
    switch (status) {
    case FATAL_LOGOPEN:
        return "Can't open log file";
    case FATAL_LOGWRITE:
        return "Can't write to log file";
    case FATAL_LOGERROR:
        return "Internal logging error";
    case FATAL_OUTOFMEM:
        return "Out of memory";
    case FATAL_EXEC:
        return "exec() failed";

    case FATAL_DEFAULT:
        return NULL;
    }

    return NULL;
}

static void timeout_handler(void *context __attr_unused__)
{
    const char *process_type_name, *msg;
    pid_t pid;
    int status, process_type;

    if (lib_signal_hup != 0) {
        settings_reload();
        lib_signal_hup = 0;
    }

    while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
        /* get the type and remove from hash */
        process_type = PID_GET_PROCESS_TYPE(pid);
        PID_REMOVE_PROCESS_TYPE(pid);

        if (process_type == PROCESS_TYPE_IMAP)
            imap_process_destroyed(pid);
        if (process_type == PROCESS_TYPE_SSL_PARAM)
            ssl_parameter_process_destroyed(pid);

        /* write errors to syslog */
        process_type_name = process_names[process_type];
        if (WIFEXITED(status)) {
            status = WEXITSTATUS(status);
            if (status != 0) {
                if (process_type == PROCESS_TYPE_LOGIN)
                    login_process_abormal_exit(pid);

                msg = get_exit_status_message(status);
                msg = msg == NULL ? "" :
                    t_strconcat(" (", msg, ")", NULL);
                i_error("child %s (%s) returned error %d%s",
                    dec2str(pid), process_type_name,
                    status, msg);
            }
        } else if (WIFSIGNALED(status)) {
            if (process_type == PROCESS_TYPE_LOGIN)
                login_process_abormal_exit(pid);
            i_error("child %s (%s) killed with signal %d",
                dec2str(pid), process_type_name,
                WTERMSIG(status));
        }
    }

    if (pid == -1 && errno != EINTR && errno != ECHILD)
        i_warning("waitpid() failed: %m");
}

static struct ip_addr *resolve_ip(const char *name)
{
    struct ip_addr *ip;
    int ret, ips_count;

    if (name == NULL)
        return NULL; /* defaults to "*" or "::" */

    if (strcmp(name, "*") == 0) {
        /* IPv4 any */
        ip = t_new(struct ip_addr, 1);
        net_get_ip_any4(ip);
        return ip;
    }

    if (strcmp(name, "::") == 0) {
        /* IPv6 any */
        ip = t_new(struct ip_addr, 1);
        net_get_ip_any6(ip);
        return ip;
    }

    /* Return the first IP if there happens to be multiple. */
    ret = net_gethostbyname(name, &ip, &ips_count);
    if (ret != 0) {
        i_fatal("Can't resolve address %s: %s",
            name, net_gethosterror(ret));
    }

    if (ips_count < 1)
        i_fatal("No IPs for address: %s", name);

    return ip;
}

static void open_fds(void)
{
    struct ip_addr *imap_ip, *imaps_ip;

    imap_ip = resolve_ip(set_imap_listen);
    imaps_ip = resolve_ip(set_imaps_listen);

    if (imaps_ip == NULL && set_imaps_listen == NULL)
        imaps_ip = imap_ip;

    null_fd = open("/dev/null", O_RDONLY);
    if (null_fd == -1)
        i_fatal("Can't open /dev/null: %m");
    fd_close_on_exec(null_fd, TRUE);

    imap_fd = set_imap_port == 0 ? dup(null_fd) :
        net_listen(imap_ip, &set_imap_port);
    if (imap_fd == -1)
        i_fatal("listen(%d) failed: %m", set_imap_port);
    fd_close_on_exec(imap_fd, TRUE);

#ifdef HAVE_SSL
    imaps_fd = set_ssl_disable || set_imaps_port == 0 ? dup(null_fd) :
        net_listen(imaps_ip, &set_imaps_port);
#else
    imaps_fd = dup(null_fd);
#endif
    if (imaps_fd == -1)
        i_fatal("listen(%d) failed: %m", set_imaps_port);
    fd_close_on_exec(imaps_fd, TRUE);
}

static void open_logfile(void)
{
    if (set_log_path == NULL)
        i_set_failure_syslog("imap-master", LOG_NDELAY, LOG_MAIL);
    else {
        /* log to file or stderr */
        i_set_failure_file(set_log_path, "imap-master");
    }

    if (set_info_log_path != NULL)
        i_set_info_file(set_info_log_path);

    i_set_failure_timestamp_format(set_log_timestamp);

    i_info("Dovecot starting up");
}

static void main_init(void)
{
    /* deny file access from everyone else except owner */
        (void)umask(0077);

    open_logfile();

    lib_init_signals(sig_quit);

    pids = hash_create(default_pool, default_pool, 128, NULL, NULL);
    to = timeout_add(100, timeout_handler, NULL);

    ssl_init();
    auth_processes_init();
    login_processes_init();
}

static void main_deinit(void)
{
        if (lib_signal_kill != 0)
        i_warning("Killed with signal %d", lib_signal_kill);

    /* make sure we log if child processes died unexpectedly */
    timeout_handler(NULL);

    login_processes_deinit();
    auth_processes_deinit();
    ssl_deinit();

    timeout_remove(to);

    if (close(null_fd) < 0)
        i_error("close(null_fd) failed: %m");
    if (close(imap_fd) < 0)
        i_error("close(imap_fd) failed: %m");
    if (close(imaps_fd) < 0)
        i_error("close(imaps_fd) failed: %m");

    hash_destroy(pids);
    closelog();
}

static void daemonize(void)
{
    pid_t pid;

    pid = fork();
    if (pid < 0)
        i_fatal("fork() failed: %m");

    if (pid != 0)
        _exit(0);

    if (setsid() < 0)
        i_fatal("setsid() failed: %m");
}

static void print_help(void)
{
    printf("Usage: imap-master [-F] [-c <config file>]\n");
}

int main(int argc, char *argv[])
{
    /* parse arguments */
    int foreground = FALSE;
    int i;

    lib_init();

    for (i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-F") == 0) {
            /* foreground */
            foreground = TRUE;
        } else if (strcmp(argv[i], "-c") == 0) {
            /* config file */
            i++;
            if (i == argc) i_fatal("Missing config file argument");
            configfile = argv[i];
        } else {
            print_help();
            i_fatal("Unknown argument: %s", argv[1]);
        }
    }

    /* read and verify settings before forking */
    settings_init();
    settings_read(configfile);
    open_fds();

    if (!foreground)
        daemonize();

    ioloop = io_loop_create(system_pool);

    main_init();
        io_loop_run(ioloop);
    main_deinit();

    io_loop_destroy(ioloop);
    lib_deinit();

        return 0;
}