src/director/doveadm-connection.c

	doveadm-connection.c revision 9ba1a38e2fa5ffe9d0db83c4a14a6552bcff3181
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller/* Copyright (c) 2010-2016 Dovecot authors, see the included COPYING file */
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "lib.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "ioloop.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "net.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "istream.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "ostream.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "array.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "str.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "strescape.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "llist.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "master-service.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "user-directory.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "mail-host.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "director.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "director-host.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "director-request.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "director-connection.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include "doveadm-connection.h"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#include <unistd.h>
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#define DOVEADM_PROTOCOL_VERSION_MAJOR 1
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#define DOVEADM_HANDSHAKE "VERSION\tdirector-doveadm\t1\t0\n"
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller#define MAX_VALID_VHOST_COUNT 1000
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning muellerstruct doveadm_connection {
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    struct doveadm_connection *prev, *next;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    int fd;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    struct io *io;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    struct istream *input;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    struct ostream *output;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    struct director *dir;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller    bool handshaked:1;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller};
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning muellerstatic struct doveadm_connection *doveadm_connections;
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning muellerstatic void doveadm_connection_deinit(struct doveadm_connection **_conn);
58721b9d3a8cd6a624269ddf507f80af4417c9bdhenning mueller
static void doveadm_cmd_host_list(struct doveadm_connection *conn)
{
    struct mail_host *const *hostp;
    string_t *str = t_str_new(1024);

    array_foreach(mail_hosts_get(conn->dir->mail_hosts), hostp) {
        str_printfa(str, "%s\t%u\t%u\t",
                net_ip2addr(&(*hostp)->ip), (*hostp)->vhost_count,
                (*hostp)->user_count);
        str_append_tabescaped(str, mail_host_get_tag(*hostp));
        str_printfa(str, "\t%c\t%ld", (*hostp)->down ? 'D' : 'U',
                (long)(*hostp)->last_updown_change);
        str_append_c(str, '\n');
    }
    str_append_c(str, '\n');
    o_stream_nsend(conn->output, str_data(str), str_len(str));
}

static void doveadm_cmd_host_list_removed(struct doveadm_connection *conn)
{
    struct mail_host_list *orig_hosts_list;
    struct mail_host *const *orig_hosts, *const *cur_hosts;
    unsigned int i, j, orig_hosts_count, cur_hosts_count;
    string_t *str = t_str_new(1024);
    int ret;

    orig_hosts_list = mail_hosts_init(conn->dir->set->director_consistent_hashing);
    (void)mail_hosts_parse_and_add(orig_hosts_list,
                       conn->dir->set->director_mail_servers);

    orig_hosts = array_get(mail_hosts_get(orig_hosts_list),
                   &orig_hosts_count);
    cur_hosts = array_get(mail_hosts_get(conn->dir->mail_hosts),
                  &cur_hosts_count);

    /* the hosts are sorted by IP */
    for (i = j = 0; i < orig_hosts_count && j < cur_hosts_count; ) {
        ret = net_ip_cmp(&orig_hosts[i]->ip, &cur_hosts[j]->ip);
        if (ret == 0)
            i++, j++;
        else if (ret > 0)
            j++;
        else {
            str_printfa(str, "%s\n",
                    net_ip2addr(&orig_hosts[i]->ip));
            i++;
        }
    }
    for (; i < orig_hosts_count; i++)
        str_printfa(str, "%s\n", net_ip2addr(&orig_hosts[i]->ip));
    str_append_c(str, '\n');
    o_stream_nsend(conn->output, str_data(str), str_len(str));

    mail_hosts_deinit(&orig_hosts_list);
}

static void doveadm_director_append_status(struct director *dir, string_t *str)
{
    if (!dir->ring_handshaked)
        str_append(str, "handshaking");
    else if (dir->ring_synced)
        str_append(str, "synced");
    else {
        str_printfa(str, "syncing - last sync %d secs ago",
                (int)(ioloop_time - dir->ring_last_sync_time));
    }
}

static void
doveadm_director_connection_append_status(struct director_connection *conn,
                      string_t *str)
{
    if (!director_connection_is_handshaked(conn))
        str_append(str, "handshaking");
    else if (director_connection_is_synced(conn))
        str_append(str, "synced");
    else
        str_append(str, "syncing");
}

static void
doveadm_director_host_append_status(struct director *dir,
                    const struct director_host *host,
                    string_t *str)
{
    struct director_connection *conn = NULL;

    if (dir->left != NULL &&
        director_connection_get_host(dir->left) == host)
        conn = dir->left;
    else if (dir->right != NULL &&
         director_connection_get_host(dir->right) == host)
        conn = dir->right;
    else {
        /* we might have a connection that is being connected */
        struct director_connection *const *connp;

        array_foreach(&dir->connections, connp) {
            if (director_connection_get_host(*connp) == host) {
                conn = *connp;
                break;
            }
        }
    }

    if (conn != NULL)
        doveadm_director_connection_append_status(conn, str);
}

static void doveadm_cmd_director_list(struct doveadm_connection *conn)
{
    struct director *dir = conn->dir;
    struct director_host *const *hostp;
    string_t *str = t_str_new(1024);
    const char *type;
    bool left, right;
    time_t last_failed;

    array_foreach(&dir->dir_hosts, hostp) {
        const struct director_host *host = *hostp;

        left = dir->left != NULL &&
            director_connection_get_host(dir->left) == host;
        right = dir->right != NULL &&
             director_connection_get_host(dir->right) == host;

        if (host->removed)
            type = "removed";
        else if (dir->self_host == host)
            type = "self";
        else if (left)
            type = right ? "l+r" : "left";
        else if (right)
            type = "right";
        else
            type = "";

        last_failed = I_MAX(host->last_network_failure,
                    host->last_protocol_failure);
        str_printfa(str, "%s\t%u\t%s\t%lu\t",
                net_ip2addr(&host->ip), host->port, type,
                (unsigned long)last_failed);
        if (dir->self_host == host)
            doveadm_director_append_status(dir, str);
        else
            doveadm_director_host_append_status(dir, host, str);
        str_append_c(str, '\n');
    }
    str_append_c(str, '\n');
    o_stream_nsend(conn->output, str_data(str), str_len(str));
}

static int
doveadm_cmd_director_add(struct doveadm_connection *conn, const char *line)
{
    const char *const *args;
    struct director_host *host;
    struct ip_addr ip;
    in_port_t port = conn->dir->self_port;

    args = t_strsplit_tabescaped(line);
    if (args[0] == NULL ||
        net_addr2ip(line, &ip) < 0 ||
        (args[1] != NULL && net_str2port(args[1], &port) < 0)) {
        i_error("doveadm sent invalid DIRECTOR-ADD parameters");
        return -1;
    }

    if (director_host_lookup(conn->dir, &ip, port) == NULL) {
        host = director_host_add(conn->dir, &ip, port);
        director_notify_ring_added(host, conn->dir->self_host);
    }
    o_stream_nsend(conn->output, "OK\n", 3);
    return 1;
}

static int
doveadm_cmd_director_remove(struct doveadm_connection *conn, const char *line)
{
    const char *const *args;
    struct director_host *host;
    struct ip_addr ip;
    in_port_t port = 0;

    args = t_strsplit_tabescaped(line);
    if (args[0] == NULL ||
        net_addr2ip(line, &ip) < 0 ||
        (args[1] != NULL && net_str2port(args[1], &port) < 0)) {
        i_error("doveadm sent invalid DIRECTOR-REMOVE parameters");
        return -1;
    }

    host = port != 0 ?
        director_host_lookup(conn->dir, &ip, port) :
        director_host_lookup_ip(conn->dir, &ip);
    if (host == NULL)
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
    else {
        director_ring_remove(host, conn->dir->self_host);
        o_stream_nsend(conn->output, "OK\n", 3);
    }
    return 1;
}

static int
doveadm_cmd_host_set_or_update(struct doveadm_connection *conn, const char *line,
                   bool update)
{
    struct director *dir = conn->dir;
    const char *const *args, *ip_str, *tag = "";
    struct mail_host *host;
    struct ip_addr ip;
    unsigned int vhost_count = UINT_MAX;

    args = t_strsplit_tabescaped(line);
    ip_str = args[0];
    if (ip_str != NULL) {
        tag = strchr(ip_str, '@');
        if (tag == NULL)
            tag = "";
        else
            ip_str = t_strdup_until(ip_str, tag++);
    }
    if (ip_str == NULL || net_addr2ip(ip_str, &ip) < 0 ||
        (args[1] != NULL && str_to_uint(args[1], &vhost_count) < 0) ||
        (args[1] == NULL && update)) {
        i_error("doveadm sent invalid %s parameters: %s",
            update ? "HOST-UPDATE" : "HOST-SET", line);
        return -1;
    }
    if (vhost_count > MAX_VALID_VHOST_COUNT && vhost_count != UINT_MAX) {
        o_stream_nsend_str(conn->output, "vhost count too large\n");
        return 1;
    }
    host = mail_host_lookup(dir->mail_hosts, &ip);
    if (host == NULL) {
        if (update) {
            o_stream_nsend_str(conn->output, "NOTFOUND\n");
            return 1;
        }
        host = mail_host_add_ip(dir->mail_hosts, &ip, tag);
    } else if (tag[0] != '\0' && strcmp(mail_host_get_tag(host), tag) != 0) {
        o_stream_nsend_str(conn->output, "host tag can't be changed\n");
        return 1;
    } else if (host->desynced) {
        o_stream_nsend_str(conn->output,
            "host is already being updated - try again later\n");
        return 1;
    }
    if (vhost_count != UINT_MAX)
        mail_host_set_vhost_count(host, vhost_count);
    /* NOTE: we don't support changing a tag for an existing host.
       it needs to be removed first. otherwise it would be a bit ugly to
       handle. */
    director_update_host(dir, dir->self_host, NULL, host);

    o_stream_nsend(conn->output, "OK\n", 3);
    return 1;
}

static int
doveadm_cmd_host_set(struct doveadm_connection *conn, const char *line)
{
    return doveadm_cmd_host_set_or_update(conn, line, FALSE);
}

static int
doveadm_cmd_host_update(struct doveadm_connection *conn, const char *line)
{
    return doveadm_cmd_host_set_or_update(conn, line, TRUE);
}

static int
doveadm_cmd_host_updown(struct doveadm_connection *conn, bool down,
            const char *line)
{
    struct mail_host *host;
    struct ip_addr ip;

    if (net_addr2ip(line, &ip) < 0) {
        i_error("doveadm sent invalid %s parameters: %s",
            down ? "HOST-DOWN" : "HOST-UP", line);
        return -1;
    }
    host = mail_host_lookup(conn->dir->mail_hosts, &ip);
    if (host == NULL) {
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
        return 1;
    }
    if (host->down == down)
        ;
    else if (host->desynced) {
        o_stream_nsend_str(conn->output,
            "host is already being updated - try again later\n");
        return 1;
    } else {
        mail_host_set_down(host, down, ioloop_time);
        director_update_host(conn->dir, conn->dir->self_host,
                     NULL, host);
    }
    o_stream_nsend(conn->output, "OK\n", 3);
    return 1;
}

static int
doveadm_cmd_host_remove(struct doveadm_connection *conn, const char *line)
{
    struct mail_host *host;
    struct ip_addr ip;

    if (net_addr2ip(line, &ip) < 0) {
        i_error("doveadm sent invalid HOST-REMOVE parameters");
        return -1;
    }
    host = mail_host_lookup(conn->dir->mail_hosts, &ip);
    if (host == NULL)
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
    else {
        director_remove_host(conn->dir, conn->dir->self_host,
                     NULL, host);
        o_stream_nsend(conn->output, "OK\n", 3);
    }
    return 1;
}

static void
doveadm_cmd_host_flush_all(struct doveadm_connection *conn)
{
    struct mail_host *const *hostp;
    unsigned int total_user_count = 0;

    array_foreach(mail_hosts_get(conn->dir->mail_hosts), hostp) {
        total_user_count += (*hostp)->user_count;
        director_flush_host(conn->dir, conn->dir->self_host,
                    NULL, *hostp);
    }
    i_warning("Flushed all backend hosts with %u users. This is an unsafe "
          "operation and may cause the same users to end up in multiple backends.",
          total_user_count);
    o_stream_nsend(conn->output, "OK\n", 3);
}

static int
doveadm_cmd_host_flush(struct doveadm_connection *conn, const char *line)
{
    struct mail_host *host;
    struct ip_addr ip;

    if (*line == '\0') {
        doveadm_cmd_host_flush_all(conn);
        return 1;
    }

    if (net_addr2ip(line, &ip) < 0) {
        i_error("doveadm sent invalid HOST-FLUSH parameters");
        return -1;
    }
    host = mail_host_lookup(conn->dir->mail_hosts, &ip);
    if (host == NULL)
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
    else {
        director_flush_host(conn->dir, conn->dir->self_host,
                    NULL, host);
        o_stream_nsend(conn->output, "OK\n", 3);
    }
    return 1;
}

static void
director_host_reset_users(struct director *dir, struct director_host *src,
              struct mail_host *host)
{
    struct user_directory_iter *iter;
    struct user *user;
    struct mail_host *new_host;

    if (dir->right != NULL)
        director_connection_cork(dir->right);

    iter = user_directory_iter_init(dir->users);
    while ((user = user_directory_iter_next(iter)) != NULL) {
        if (user->host != host)
            continue;
        new_host = mail_host_get_by_hash(dir->mail_hosts,
                         user->username_hash,
                         mail_host_get_tag(host));
        if (new_host != host) T_BEGIN {
            director_move_user(dir, src, NULL,
                       user->username_hash, new_host);
        } T_END;
    }
    user_directory_iter_deinit(&iter);
    if (dir->right != NULL)
        director_connection_uncork(dir->right);
}

static void
doveadm_cmd_host_reset_users_all(struct doveadm_connection *conn)
{
    struct mail_host *const *hostp;

    array_foreach(mail_hosts_get(conn->dir->mail_hosts), hostp)
        director_host_reset_users(conn->dir, conn->dir->self_host, *hostp);
    o_stream_nsend(conn->output, "OK\n", 3);
}

static int
doveadm_cmd_host_reset_users(struct doveadm_connection *conn, const char *line)
{
    struct mail_host *host;
    struct ip_addr ip;

    if (line[0] == '\0') {
        doveadm_cmd_host_reset_users_all(conn);
        return 1;
    }

    if (net_addr2ip(line, &ip) < 0) {
        i_error("doveadm sent invalid HOST-RESET-USERS parameters");
        return -1;
    }
    host = mail_host_lookup(conn->dir->mail_hosts, &ip);
    if (host == NULL)
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
    else {
        director_host_reset_users(conn->dir, conn->dir->self_host, host);
        o_stream_nsend(conn->output, "OK\n", 3);
    }
    return 1;
}

static int
doveadm_cmd_user_lookup(struct doveadm_connection *conn, const char *line)
{
    struct user *user;
    struct mail_host *host;
    const char *username, *tag, *const *args;
    unsigned int username_hash;
    string_t *str = t_str_new(256);

    args = t_strsplit_tabescaped(line);
    if (args[0] == NULL) {
        username = "";
        tag = "";
    } else {
        username = args[0];
        tag = args[1] != NULL ? args[1] : "";
    }
    if (str_to_uint(username, &username_hash) < 0)
        username_hash = user_directory_get_username_hash(conn->dir->users, username);

    /* get user's current host */
    user = user_directory_lookup(conn->dir->users, username_hash);
    if (user == NULL)
        str_append(str, "\t0");
    else {
        str_printfa(str, "%s\t%u", net_ip2addr(&user->host->ip),
                user->timestamp +
                conn->dir->set->director_user_expire);
    }

    /* get host if it wasn't in user directory */
    host = mail_host_get_by_hash(conn->dir->mail_hosts, username_hash, tag);
    if (host == NULL)
        str_append(str, "\t");
    else
        str_printfa(str, "\t%s", net_ip2addr(&host->ip));

    /* get host with default configuration */
    host = mail_host_get_by_hash(conn->dir->orig_config_hosts,
                     username_hash, tag);
    if (host == NULL)
        str_append(str, "\t\n");
    else
        str_printfa(str, "\t%s\n", net_ip2addr(&host->ip));
    o_stream_nsend(conn->output, str_data(str), str_len(str));
    return 1;
}

static int
doveadm_cmd_user_list(struct doveadm_connection *conn, const char *line)
{
    struct user_directory_iter *iter;
    struct user *user;
    struct ip_addr ip;

    if (*line != '\0') {
        if (net_addr2ip(line, &ip) < 0) {
            i_error("doveadm sent invalid USER-LIST parameters");
            return -1;
        }
    } else {
        ip.family = 0;
    }

    iter = user_directory_iter_init(conn->dir->users);
    while ((user = user_directory_iter_next(iter)) != NULL) {
        if (ip.family == 0 ||
            net_ip_compare(&ip, &user->host->ip)) T_BEGIN {
            unsigned int expire_time = user->timestamp +
                conn->dir->set->director_user_expire;

            o_stream_nsend_str(conn->output, t_strdup_printf(
                "%u\t%u\t%s\n",
                user->username_hash, expire_time,
                net_ip2addr(&user->host->ip)));
        } T_END;
    }
    user_directory_iter_deinit(&iter);
    o_stream_nsend(conn->output, "\n", 1);
    return 1;
}

static int
doveadm_cmd_user_move(struct doveadm_connection *conn, const char *line)
{
    unsigned int username_hash;
    const char *const *args;
    struct user *user;
    struct mail_host *host;
    struct ip_addr ip;

    args = t_strsplit_tabescaped(line);
    if (args[0] == NULL || args[1] == NULL ||
        net_addr2ip(args[1], &ip) < 0) {
        i_error("doveadm sent invalid USER-MOVE parameters: %s", line);
        return -1;
    }
    host = mail_host_lookup(conn->dir->mail_hosts, &ip);
    if (host == NULL) {
        o_stream_nsend_str(conn->output, "NOTFOUND\n");
        return 1;
    }

    if (str_to_uint(args[0], &username_hash) < 0)
        username_hash = user_directory_get_username_hash(conn->dir->users, line);
    user = user_directory_lookup(conn->dir->users, username_hash);
    if (user != NULL && user->kill_state != USER_KILL_STATE_NONE) {
        o_stream_nsend_str(conn->output, "TRYAGAIN\n");
        return 1;
    }

    director_move_user(conn->dir, conn->dir->self_host, NULL,
               username_hash, host);
    o_stream_nsend(conn->output, "OK\n", 3);
    return 1;
}

static int
doveadm_cmd_user_kick(struct doveadm_connection *conn, const char *line)
{
    const char *const *args;

    args = t_strsplit_tabescaped(line);
    if (args[0] == NULL) {
        i_error("doveadm sent invalid USER-KICK parameters: %s", line);
        return -1;
    }

    director_kick_user(conn->dir, conn->dir->self_host, NULL, args[0]);
    o_stream_nsend(conn->output, "OK\n", 3);
    return 1;
}

static int
doveadm_connection_cmd(struct doveadm_connection *conn, const char *line)
{
    const char *cmd, *args;
    int ret = 1;

    args = strchr(line, '\t');
    if (args == NULL) {
        cmd = line;
        args = "";
    } else {
        cmd = t_strdup_until(line, args);
        args++;
    }

    if (strcmp(cmd, "HOST-LIST") == 0)
        doveadm_cmd_host_list(conn);
    else if (strcmp(cmd, "HOST-LIST-REMOVED") == 0)
        doveadm_cmd_host_list_removed(conn);
    else if (strcmp(cmd, "DIRECTOR-LIST") == 0)
        doveadm_cmd_director_list(conn);
    else if (strcmp(cmd, "DIRECTOR-ADD") == 0)
        ret = doveadm_cmd_director_add(conn, args);
    else if (strcmp(cmd, "DIRECTOR-REMOVE") == 0)
        ret = doveadm_cmd_director_remove(conn, args);
    else if (strcmp(cmd, "HOST-SET") == 0)
        ret = doveadm_cmd_host_set(conn, args);
    else if (strcmp(cmd, "HOST-UPDATE") == 0)
        ret = doveadm_cmd_host_update(conn, args);
    else if (strcmp(cmd, "HOST-UP") == 0)
        ret = doveadm_cmd_host_updown(conn, FALSE, args);
    else if (strcmp(cmd, "HOST-DOWN") == 0)
        ret = doveadm_cmd_host_updown(conn, TRUE, args);
    else if (strcmp(cmd, "HOST-REMOVE") == 0)
        ret = doveadm_cmd_host_remove(conn, args);
    else if (strcmp(cmd, "HOST-FLUSH") == 0)
        ret = doveadm_cmd_host_flush(conn, args);
    else if (strcmp(cmd, "HOST-RESET-USERS") == 0)
        ret = doveadm_cmd_host_reset_users(conn, args);
    else if (strcmp(cmd, "USER-LOOKUP") == 0)
        ret = doveadm_cmd_user_lookup(conn, args);
    else if (strcmp(cmd, "USER-LIST") == 0)
        ret = doveadm_cmd_user_list(conn, args);
    else if (strcmp(cmd, "USER-MOVE") == 0)
        ret = doveadm_cmd_user_move(conn, args);
    else if (strcmp(cmd, "USER-KICK") == 0)
        ret = doveadm_cmd_user_kick(conn, args);
    else {
        i_error("doveadm sent unknown command: %s", line);
        ret = -1;
    }
    return ret;
}

static void doveadm_connection_input(struct doveadm_connection *conn)
{
    const char *line;
    int ret = 1;

    if (!conn->handshaked) {
        if ((line = i_stream_read_next_line(conn->input)) == NULL) {
            if (conn->input->eof || conn->input->stream_errno != 0)
                doveadm_connection_deinit(&conn);
            return;
        }

        if (!version_string_verify(line, "director-doveadm",
                       DOVEADM_PROTOCOL_VERSION_MAJOR)) {
            i_error("doveadm not compatible with this server "
                "(mixed old and new binaries?)");
            doveadm_connection_deinit(&conn);
            return;
        }
        conn->handshaked = TRUE;
    }

    while ((line = i_stream_read_next_line(conn->input)) != NULL && ret > 0) {
        ret = doveadm_connection_cmd(conn, line);
    }
    if (conn->input->eof || conn->input->stream_errno != 0 || ret < 0)
        doveadm_connection_deinit(&conn);
}

struct doveadm_connection *
doveadm_connection_init(struct director *dir, int fd)
{
    struct doveadm_connection *conn;

    conn = i_new(struct doveadm_connection, 1);
    conn->fd = fd;
    conn->dir = dir;
    conn->input = i_stream_create_fd(conn->fd, 1024);
    conn->output = o_stream_create_fd(conn->fd, (size_t)-1);
    o_stream_set_no_error_handling(conn->output, TRUE);
    conn->io = io_add(conn->fd, IO_READ, doveadm_connection_input, conn);
    o_stream_nsend_str(conn->output, DOVEADM_HANDSHAKE);

    DLLIST_PREPEND(&doveadm_connections, conn);
    return conn;
}

static void doveadm_connection_deinit(struct doveadm_connection **_conn)
{
    struct doveadm_connection *conn = *_conn;

    *_conn = NULL;

    DLLIST_REMOVE(&doveadm_connections, conn);
    io_remove(&conn->io);
    i_stream_unref(&conn->input);
    o_stream_unref(&conn->output);
    if (close(conn->fd) < 0)
        i_error("close(doveadm connection) failed: %m");
    i_free(conn);

    master_service_client_connection_destroyed(master_service);
}

void doveadm_connections_deinit(void)
{
    while (doveadm_connections != NULL) {
        struct doveadm_connection *conn = doveadm_connections;

        doveadm_connection_deinit(&conn);
    }
}