src/pop3/main.c

	main.c revision 86791365b10f45982c88e70f2eb94fd6c3fea151
/* Copyright (c) 2002-2009 Dovecot authors, see the included COPYING file */

#include "pop3-common.h"
#include "ioloop.h"
#include "buffer.h"
#include "istream.h"
#include "ostream.h"
#include "base64.h"
#include "restrict-access.h"
#include "master-service.h"
#include "master-login.h"
#include "master-interface.h"
#include "var-expand.h"
#include "mail-storage-service.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define IS_STANDALONE() \
        (getenv(MASTER_UID_ENV) == NULL)

static struct mail_storage_service_ctx *storage_service;
static struct master_login *master_login = NULL;

void (*hook_client_created)(struct client **client) = NULL;

static void pop3_die(void)
{
    /* do nothing. pop3 connections typically die pretty quick anyway. */
}

static void client_add_input(struct client *client, const buffer_t *buf)
{
    struct ostream *output;

    if (buf != NULL && buf->used > 0) {
        if (!i_stream_add_data(client->input, buf->data, buf->used))
            i_panic("Couldn't add client input to stream");
    }

    output = client->output;
    o_stream_ref(output);
    o_stream_cork(output);
    if (!IS_STANDALONE())
        client_send_line(client, "+OK Logged in.");
    (void)client_handle_input(client);
    o_stream_uncork(output);
    o_stream_unref(&output);
}

static int
client_create_from_input(const struct mail_storage_service_input *input,
             int fd_in, int fd_out, const buffer_t *input_buf,
             const char **error_r)
{
    struct mail_storage_service_user *user;
    struct mail_user *mail_user;
    struct client *client;
    const struct pop3_settings *set;

    if (mail_storage_service_lookup_next(storage_service, input,
                         &user, &mail_user, error_r) <= 0)
        return -1;
    restrict_access_allow_coredumps(TRUE);

    set = mail_storage_service_user_get_set(user)[1];
    client = client_create(fd_in, fd_out, mail_user, user, set);
    T_BEGIN {
        client_add_input(client, input_buf);
    } T_END;
    return 0;
}

static void main_stdio_run(void)
{
    struct mail_storage_service_input input;
    buffer_t *input_buf;
    const char *value, *error, *input_base64;

    memset(&input, 0, sizeof(input));
    input.module = input.service = "pop3";
    input.username = getenv("USER");
    if (input.username == NULL && IS_STANDALONE())
        input.username = getlogin();
    if (input.username == NULL)
        i_fatal("USER environment missing");
    if ((value = getenv("IP")) != NULL)
        net_addr2ip(value, &input.remote_ip);
    if ((value = getenv("LOCAL_IP")) != NULL)
        net_addr2ip(value, &input.local_ip);

    input_base64 = getenv("CLIENT_INPUT");
    input_buf = input_base64 == NULL ? NULL :
        t_base64_decode_str(input_base64);

    if (client_create_from_input(&input, STDIN_FILENO, STDOUT_FILENO,
                     input_buf, &error) < 0)
        i_fatal("%s", error);
}

static void
login_client_connected(const struct master_login_client *client,
               const char *username, const char *const *extra_fields)
{
    struct mail_storage_service_input input;
    const char *error;
    buffer_t input_buf;

    memset(&input, 0, sizeof(input));
    input.module = input.service = "pop3";
    input.local_ip = client->auth_req.local_ip;
    input.remote_ip = client->auth_req.remote_ip;
    input.username = username;
    input.userdb_fields = extra_fields;

    if (input.username == NULL) {
        i_error("login client: Username missing from auth reply");
        (void)close(client->fd);
        return;
    }

    buffer_create_const_data(&input_buf, client->data,
                 client->auth_req.data_size);
    if (client_create_from_input(&input, client->fd, client->fd,
                     &input_buf, &error) < 0) {
        i_error("%s", error);
        (void)close(client->fd);
    }
}

static void client_connected(const struct master_service_connection *conn)
{
    if (master_login == NULL) {
        /* running standalone, we shouldn't even get here */
        (void)close(conn->fd);
    } else {
        master_login_add(master_login, conn->fd);
    }
}

int main(int argc, char *argv[])
{
    static const struct setting_parser_info *set_roots[] = {
        &pop3_setting_parser_info,
        NULL
    };
    enum master_service_flags service_flags = 0;
    enum mail_storage_service_flags storage_service_flags = 0;

    if (IS_STANDALONE() && getuid() == 0 &&
        net_getpeername(1, NULL, NULL) == 0) {
        printf("-ERR pop3 binary must not be started from "
               "inetd, use pop3-login instead.\n");
        return 1;
    }

    if (IS_STANDALONE()) {
        service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
            MASTER_SERVICE_FLAG_STD_CLIENT;
    } else {
        storage_service_flags |=
            MAIL_STORAGE_SERVICE_FLAG_DISALLOW_ROOT;
    }

    master_service = master_service_init("pop3", service_flags,
                         &argc, &argv, NULL);
    if (master_getopt(master_service) > 0)
        return FATAL_DEFAULT;
    master_service_init_finish(master_service);
    master_service_set_die_callback(master_service, pop3_die);

    storage_service =
        mail_storage_service_init(master_service,
                      set_roots, storage_service_flags);

    /* fake that we're running, so we know if client was destroyed
       while handling its initial input */
    io_loop_set_running(current_ioloop);

    if (IS_STANDALONE()) {
        T_BEGIN {
            main_stdio_run();
        } T_END;
    } else {
        master_login = master_login_init("auth-master",
                         login_client_connected);
        io_loop_set_running(current_ioloop);
    }

    if (io_loop_is_running(current_ioloop))
        master_service_run(master_service, client_connected);
    clients_destroy_all();

    if (master_login != NULL)
        master_login_deinit(&master_login);
    mail_storage_service_deinit(&storage_service);
    master_service_deinit(&master_service);
    return 0;
}