src/master/main.c

	main.c revision ba9169997959e4d355479d9e2bebf67844beb43e
/* Copyright (C) 2002 Timo Sirainen */

#include "common.h"
#include "ioloop.h"
#include "lib-signals.h"
#include "network.h"

#include "auth-process.h"
#include "login-process.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"
};

static IOLoop ioloop;
static Timeout to_children;

HashTable *pids;
int null_fd, imap_fd, imaps_fd;

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

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

    return FALSE;
}

void clean_child_process(void)
{
    extern char **environ;

    /* remove all environment, we don't need them */
    if (environ != NULL)
        *environ = NULL;

    /* set the failure log */
    if (set_log_path != NULL) {
        putenv((char *) t_strconcat("IMAP_LOGFILE=",
                        set_log_path, NULL));
    }
    if (set_log_timestamp != NULL) {
        putenv((char *) t_strconcat("IMAP_LOGSTAMP=",
                        set_log_timestamp, NULL));
    }

    (void)close(null_fd);
    (void)close(imap_fd);
    (void)close(imaps_fd);

    /* close fds for auth/login processes */
    login_processes_cleanup();
        auth_processes_cleanup();

    closelog();
}

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

static void children_check_timeout(void *context __attr_unused__,
                   Timeout timeout __attr_unused__)
{
    const char *process_type_name;
    pid_t pid;
    int status, process_type;

    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);

        /* write errors to syslog */
        process_type_name = process_names[process_type];
        if (WIFEXITED(status)) {
            status = WEXITSTATUS(status);
            if (status != 0) {
                i_error("child %d (%s) returned error %d",
                    (int)pid, process_type_name, status);
            }
        } else if (WIFSIGNALED(status)) {
            i_error("child %d (%s) killed with signal %d",
                (int)pid, process_type_name, WTERMSIG(status));
        }
    }

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

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

    if (name == NULL || *name == '\0')
        return NULL;

    ret = net_gethostbyname(name, &ip, &ips_count);
    if (ret != 0)
        i_fatal("Can't resolve address: %s", name);

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

    return ip;
}

static void open_fds(void)
{
    IPADDR *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");

    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: %ms", set_imap_port);
    }

    imaps_fd = set_ssl_cert_file == NULL || set_ssl_key_file == NULL ||
        set_imaps_port == 0 ? dup(null_fd) :
        net_listen(imaps_ip, &set_imaps_port);
    if (imaps_fd == -1) {
        i_fatal("listen(%d) failed: %m", set_imaps_port);
    }
}

static void main_init()
{
    lib_init_signals(sig_quit);

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

    if (set_log_path == NULL) {
        openlog("imap-master", LOG_NDELAY, LOG_MAIL);

        i_set_panic_handler(i_syslog_panic_handler);
        i_set_fatal_handler(i_syslog_fatal_handler);
        i_set_error_handler(i_syslog_error_handler);
        i_set_warning_handler(i_syslog_warning_handler);
    } else {
        /* log failures into specified log file */
        i_set_failure_file(set_log_path, "imap-master");
        i_set_failure_timestamp_format(set_log_timestamp);
    }

    pids = hash_create(default_pool, 128, NULL, NULL);
    to_children = timeout_add(100, children_check_timeout, NULL);

    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);

    login_processes_deinit();
    auth_processes_deinit();

    timeout_remove(to_children);

    (void)close(null_fd);
    (void)close(imap_fd);
    (void)close(imaps_fd);

    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);
}

int main(int argc, char *argv[])
{
    /* parse arguments */
    const char *configfile = SYSCONFDIR "/" PACKAGE ".conf";
    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 {
            i_fatal("Unknown argument: %s", argv[1]);
        }
    }

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

    if (!foreground)
        daemonize();

    ioloop = io_loop_create();

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

    io_loop_destroy(ioloop);
    lib_deinit();

        return 0;
}