src/pop3/main.c

	main.c revision 84f80d9231b6ddc80ebfae425fd3674620fdf746
/* Copyright (C) 2002-2003 Timo Sirainen */

#include "common.h"
#include "ioloop.h"
#include "lib-signals.h"
#include "restrict-access.h"
#include "fd-close-on-exec.h"
#include "process-title.h"
#include "randgen.h"
#include "module-dir.h"
#include "mail-storage.h"

#include <stdlib.h>
#include <syslog.h>

#define IS_STANDALONE() \
        (getenv("LOGGED_IN") == NULL)

struct client_workaround_list {
    const char *name;
    enum client_workarounds num;
};

struct client_workaround_list client_workaround_list[] = {
    { "outlook-no-nuls", WORKAROUND_OUTLOOK_NO_NULS },
    { NULL, 0 }
};

struct ioloop *ioloop;

void (*hook_mail_storage_created)(struct mail_storage **storage) = NULL;
void (*hook_client_created)(struct client **client) = NULL;

static struct module *modules;
static char log_prefix[128]; /* syslog() needs this to be permanent */
enum client_workarounds client_workarounds = 0;

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

static void parse_workarounds(void)
{
        struct client_workaround_list *list;
    const char *env, *const *str;

    env = getenv("POP3_CLIENT_WORKAROUNDS");
    if (env == NULL)
        return;

    for (str = t_strsplit_spaces(env, " "); *str != NULL; str++) {
        list = client_workaround_list;
        for (; list->name != NULL; list++) {
            if (strcasecmp(*str, list->name) == 0) {
                client_workarounds |= list->num;
                break;
            }
        }
        if (list->name == NULL)
            i_fatal("Unknown client workaround: %s", *str);
    }
}

static void open_logfile(void)
{
    const char *user;

    if (getenv("LOG_TO_MASTER") != NULL) {
        i_set_failure_internal();
        return;
    }

    user = getenv("USER");
    if (user == NULL) user = "??";
    if (strlen(user) >= sizeof(log_prefix)-6) {
        /* quite a long user name, cut it */
        user = t_strndup(user, sizeof(log_prefix)-6-2);
        user = t_strconcat(user, "..", NULL);
    }
    i_snprintf(log_prefix, sizeof(log_prefix), "pop3(%s)", user);

    if (getenv("USE_SYSLOG") != NULL)
        i_set_failure_syslog(log_prefix, LOG_NDELAY, LOG_MAIL);
    else {
        /* log to file or stderr */
        i_set_failure_file(getenv("LOGFILE"), log_prefix);
    }

    if (getenv("INFOLOGFILE") != NULL)
        i_set_info_file(getenv("INFOLOGFILE"));

    i_set_failure_timestamp_format(getenv("LOGSTAMP"));
}

static void drop_privileges(void)
{
    /* Log file or syslog opening probably requires roots */
    open_logfile();

    /* Most likely needed. Have to open /dev/urandom before possible
       chrooting. */
    random_init();

    restrict_access_by_env(!IS_STANDALONE());
}

static int main_init(void)
{
    struct mail_storage *storage;
    const char *mail;

    lib_init_signals(sig_quit);

    if (getenv("USER") == NULL)
        i_fatal("USER environment missing");

    mail_storage_register_all();
    clients_init();

    modules = getenv("MODULE_DIR") == NULL ? NULL :
        module_dir_load(getenv("MODULE_DIR"), TRUE);

    mail = getenv("MAIL");
    if (mail == NULL) {
        /* support also maildir-specific environment */
        mail = getenv("MAILDIR");
        if (mail != NULL)
            mail = t_strconcat("maildir:", mail, NULL);
    }
        parse_workarounds();

    storage = mail_storage_create_with_data(mail, getenv("USER"));
    if (storage == NULL) {
        /* failed */
        if (mail != NULL && *mail != '\0')
            i_fatal("Failed to create storage with data: %s", mail);
        else {
            const char *home;

            home = getenv("HOME");
            if (home == NULL) home = "not set";

            i_fatal("MAIL environment missing and "
                "autodetection failed (home %s)", home);
        }
    }

    if (hook_mail_storage_created != NULL)
        hook_mail_storage_created(&storage);

    return client_create(0, 1, storage) != NULL;
}

static void main_deinit(void)
{
    /* warn about being killed because of some signal, except SIGINT (^C)
       which is too common at least while testing :) */
    if (lib_signal_kill != 0 && lib_signal_kill != 2)
        i_warning("Killed with signal %d", lib_signal_kill);

    module_dir_unload(modules);

    clients_deinit();
        mail_storage_deinit();
    random_deinit();

    closelog();
}

int main(int argc __attr_unused__, char *argv[], char *envp[])
{
#ifdef DEBUG
    if (getenv("LOGGED_IN") != NULL && getenv("GDB") == NULL)
        fd_debug_verify_leaks(3, 1024);
#endif
    /* NOTE: we start rooted, so keep the code minimal until
       restrict_access_by_env() is called */
    lib_init();
    drop_privileges();

        process_title_init(argv, envp);
    ioloop = io_loop_create(system_pool);

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

    io_loop_destroy(ioloop);
    lib_deinit();

    return 0;
}