request.cpp

Go to the documentation of this file.

/*
 * Crossfire -- cooperative multi-player graphical RPG and adventure game
 *
 * Copyright (c) 1999-2014 Mark Wedel and the Crossfire Development Team
 * Copyright (c) 1992 Frank Tore Johansen
 *
 * Crossfire is free software and comes with ABSOLUTELY NO WARRANTY. You are
 * welcome to redistribute it under certain conditions. For details, please
 * see COPYING and LICENSE.
 *
 * The authors can be reached via e-mail at <crossfire@metalforge.org>.
 */
 
#include "global.h"
 
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
 
/* This block is basically taken from socket.c - I assume if it works there,
 * it should work here.
 */
#ifndef WIN32 /* ---win32 exclude unix headers */
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
typedef int ssop_t;     
#else
#include <winsock2.h>
typedef char ssop_t;    
#endif /* win32 */
 
#include "commands.h"
#include "living.h"
#include "newserver.h"
#include "shared/newclient.h"
#include "sounds.h"
#include "sproto.h"
 
#define VALIDCHAR_MSG "The first character must be alphanumeric and the last cannot be a space. None of these characters are allowed: :;/\\["
 
static const int MAP2_COORD_MIN = -MAP2_COORD_OFFSET;
static const int MAP2_COORD_MAX = 63 - MAP2_COORD_OFFSET;
 
static bool map2_coord_valid(int x) {
    return x >= MAP2_COORD_MIN && x<= MAP2_COORD_MAX;
}
 
static uint16_t MAP2_COORD_ENCODE(int x, int y, int flags) {
    assert(map2_coord_valid(x));
    assert(map2_coord_valid(y));
    assert(flags >= 0 && flags <= 15);
    return ((x+MAP2_COORD_OFFSET)&0x3f)<<10 | ((y+MAP2_COORD_OFFSET)&0x3f)<<4 | (flags&0x0f);
}
 
static int clamp(int x, int min, int max) {
    return MAX(min, MIN(x, max));
}
 
static void handle_scroll(socket_struct *socket, SockList *sl) {
    // It is possible for map_scroll_x/y to exceed the maximum value that can be encoded
    // in one scroll command. If that is the case, encode multiple.
    while (socket->map_scroll_x || socket->map_scroll_y) { // either are non-zero
        int8_t tx = clamp(socket->map_scroll_x, MAP2_COORD_MIN, MAP2_COORD_MAX);
        int8_t ty = clamp(socket->map_scroll_y, MAP2_COORD_MIN, MAP2_COORD_MAX);
        uint16_t coord = MAP2_COORD_ENCODE(tx, ty, 1);
        SockList_AddShort(sl, coord);
        socket->map_scroll_x -= tx;
        socket->map_scroll_y -= ty;
    }
}
 
static const short atnr_cs_stat[NROFATTACKS] = {
    CS_STAT_RES_PHYS, CS_STAT_RES_MAG,
    CS_STAT_RES_FIRE, CS_STAT_RES_ELEC,
    CS_STAT_RES_COLD, CS_STAT_RES_CONF,
    CS_STAT_RES_ACID,
    CS_STAT_RES_DRAIN, -1 /* weaponmagic */,
    CS_STAT_RES_GHOSTHIT, CS_STAT_RES_POISON,
    CS_STAT_RES_SLOW, CS_STAT_RES_PARA,
    CS_STAT_TURN_UNDEAD,
    CS_STAT_RES_FEAR, -1 /* Cancellation */,
    CS_STAT_RES_DEPLETE, CS_STAT_RES_DEATH,
    -1 /* Chaos */, -1 /* Counterspell */,
    -1 /* Godpower */, CS_STAT_RES_HOLYWORD,
    CS_STAT_RES_BLIND,
    -1, /* Internal */
    -1, /* life stealing */
    -1 /* Disease - not fully done yet */
};
 
void set_up_cmd(char *buf, int len, socket_struct *ns) {
    int s = 0;
    char *cmd, *param;
    SockList sl;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus set_up_cmd information\n", ns->host);
        return;
    }
 
    /* run through the cmds of setup
     * syntax is setup <cmdname1> <parameter> <cmdname2> <parameter> ...
     *
     * we send the status of the cmd back, or a FALSE is the cmd
     * is the server unknown
     * The client then must sort this out
     */
 
    LOG(llevDebug, "setup: %s\n", buf);
    SockList_Init(&sl);
    SockList_AddString(&sl, "setup");
    while (s < len) {
        cmd = &buf[s];
 
        /* find the next space, and put a null there */
        for (; buf[s] && buf[s] != ' '; s++)
            ;
        if (s >= len)
            break;
        buf[s++] = 0;
 
        while (buf[s] == ' ')
            s++;
        if (s >= len)
            break;
        param = &buf[s];
 
        for (; buf[s] && buf[s] != ' '; s++)
            ;
        buf[s++] = 0;
 
        while (s < len && buf[s] == ' ')
            s++;
 
        SockList_AddPrintf(&sl, " %s ", cmd);
 
        if (!strcmp(cmd, "sound2")) {
            ns->sound = atoi(param)&(SND_EFFECTS|SND_MUSIC|SND_MUTE);
            SockList_AddString(&sl, param);
        } else if (!strcmp(cmd, "spellmon")) {
            int monitor_spells;
 
            monitor_spells = atoi(param);
            if (monitor_spells < 0 || monitor_spells > 2) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->monitor_spells = monitor_spells;
                SockList_AddPrintf(&sl, "%d", monitor_spells);
            }
        } else if (!strcmp(cmd, "darkness")) {
            int darkness;
 
            darkness = atoi(param);
            if (darkness != 0 && darkness != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->darkness = darkness;
                SockList_AddPrintf(&sl, "%d", darkness);
            }
        } else if (!strcmp(cmd, "map2cmd")) {
            int map2cmd;
 
            map2cmd = atoi(param);
            if (map2cmd != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                SockList_AddString(&sl, "1");
            }
        } else if (!strcmp(cmd, "facecache")) {
            int facecache;
 
            facecache = atoi(param);
            if (facecache != 0 && facecache != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->facecache = facecache;
                SockList_AddPrintf(&sl, "%d", facecache);
            }
        } else if (!strcmp(cmd, "faceset")) {
            int q = atoi(param);
 
            if (is_valid_faceset(q))
                ns->faceset = q;
            SockList_AddPrintf(&sl, "%d", ns->faceset);
        } else if (!strcmp(cmd, "mapsize")) {
            int x, y, n;
 
            if (sscanf(param, "%dx%d%n", &x, &y, &n) != 2 || n != (int)strlen(param)) {
                /* mapsize command is invalid, return maximum map size */
                x = 0;
                y = 0;
            }
 
            /* Return the maximum map size if the requested x/y is 0, as per
             * protocol.txt. Note this does not actually change the map size.
             */
            if ((x <= 0) && (y <= 0)) {
                SockList_AddPrintf(&sl, "%dx%d", MAP_CLIENT_X, MAP_CLIENT_Y);
            } else {
                player *pl;
 
                /* Constrain the provided map size to what is defined in config.h */
                if (x < MAP_CLIENT_X_MINIMUM)
                    x = MAP_CLIENT_X_MINIMUM;
                if (y < MAP_CLIENT_Y_MINIMUM)
                    y = MAP_CLIENT_Y_MINIMUM;
                if (x > MAP_CLIENT_X)
                    x = MAP_CLIENT_X;
                if (y > MAP_CLIENT_Y)
                    y = MAP_CLIENT_Y;
 
                ns->mapx = x;
                ns->mapy = y;
 
                /* better to send back what we are really using and not the
                 * param as given to us in case it gets parsed differently.
                 */
                SockList_AddPrintf(&sl, "%dx%d", x, y);
 
                /* need to update the los, else the view jumps */
                pl = find_player_socket(ns);
                if (pl)
                    update_los(pl->ob);
 
                /* Client and server need to resynchronize on data - treating it as
                 * a new map is best way to go.
                 */
                map_newmap_cmd(ns);
            }
        } else if (!strcmp(cmd, "tick")) {
            int tick;
 
            tick = atoi(param);
            if (tick != 0 && tick != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->tick = tick;
                SockList_AddPrintf(&sl, "%d", tick);
            }
        } else if (!strcmp(cmd, "bot")) {
            int is_bot;
 
            is_bot = atoi(param);
            if (is_bot != 0 && is_bot != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->is_bot = is_bot;
                SockList_AddPrintf(&sl, "%d", is_bot);
            }
        } else if (!strcmp(cmd, "want_pickup")) {
            int want_pickup;
 
            want_pickup = atoi(param);
            if (want_pickup != 0 && want_pickup != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->want_pickup = want_pickup;
                SockList_AddPrintf(&sl, "%d", want_pickup);
            }
        } else if (!strcmp(cmd, "num_look_objects")) {
            int tmp;
            player *pl;
 
            tmp = atoi(param);
            if (tmp < MIN_NUM_LOOK_OBJECTS) {
                tmp = MIN_NUM_LOOK_OBJECTS;
            } else if (tmp > MAX_NUM_LOOK_OBJECTS) {
                tmp = MAX_NUM_LOOK_OBJECTS;
            }
            ns->num_look_objects = (uint8_t)tmp;
            SockList_AddPrintf(&sl, "%d", tmp);
 
            pl = find_player_socket(ns);
            if (pl && pl->ob) {
              ns->update_look = 1;
              esrv_draw_look(pl->ob);
            }
        } else if (!strcmp(cmd, "extended_stats")) {
            int extended_stats;
 
            extended_stats = atoi(param);
            if (extended_stats != 0 && extended_stats != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->extended_stats = extended_stats;
                SockList_AddPrintf(&sl, "%d", extended_stats);
            }
        } else if (!strcmp(cmd, "beat")) {
            int use_beat = atoi(param);
 
            if (use_beat != 0 && use_beat != 1) {
                SockList_AddString(&sl, "FALSE");
            } else {
                ns->heartbeat = use_beat ? true : false;
 
                // Send setup command with standard beat interval.
                SockList_AddPrintf(&sl, "%d", BEAT_INTERVAL);
            }
        } else if (!strcmp(cmd, "loginmethod")) {
            int loginmethod;
 
            loginmethod = atoi(param);
 
            /* Only support basic login right now */
            if (loginmethod > 2) loginmethod=2;
 
            ns->login_method = loginmethod;
            SockList_AddPrintf(&sl, "%d", loginmethod);
 
        } else if (!strcmp(cmd, "notifications")) {
            int notifications;
 
            notifications = atoi(param);
 
            ns->notifications = MIN(notifications, 3);
            SockList_AddPrintf(&sl, "%d", ns->notifications);
 
        } else if (!strcmp(cmd, "newmapcmd")) {
            /* newmapcmd is deprecated (now standard part), but some
             * clients still use this setup option, and if the server
             * doesn't respond, erroneously report that the client is
             * too old.  Since it is always on, regardless of what is
             * request, send back one.
             */
            SockList_AddString(&sl, "1");
        } else if (!strcmp(cmd, "extendedTextInfos")) {
            /* like newmapcmd above, extendedTextInfos is
             * obsolete, but we respond for the same reason as we do
             * in newmapcmd
             */
            SockList_AddString(&sl, "1");
        } else if (!strcmp(cmd, "itemcmd")) {
            /* like newmapcmd above, itemcmd is
             * obsolete, but we respond for the same reason as we do
             * in newmapcmd
             */
            SockList_AddString(&sl, "2");
        } else if (!strcmp(cmd, "exp64")) {
            /* like newmapcmd above, exp64 is
             * obsolete, but we respond for the same reason as we do
             * in newmapcmd
             */
            SockList_AddString(&sl, "1");
        } else {
            /* Didn't get a setup command we understood -
             * report a failure to the client.
             */
            SockList_AddString(&sl, "FALSE");
        }
    } /* for processing all the setup commands */
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
}
 
void add_me_cmd(char *buf, int len, socket_struct *ns) {
    Settings oldsettings;
    SockList sl;
    (void)buf;
    (void)len;
 
    oldsettings = settings;
    if (ns->status != Ns_Add) {
        SockList_Init(&sl);
        SockList_AddString(&sl, "addme_failed");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
    } else if (find_player_socket(ns) == NULL) {
        /* if there is already a player for this socket (add_me was already called),
         * just ignore, else weird issues. */
 
        add_player(ns, 0);
        /* Basically, the add_player copies the socket structure into
         * the player structure, so this one (which is from init_sockets)
         * is not needed anymore. The write below should still work,
         * as the stuff in ns is still relevant.
         */
        SockList_Init(&sl);
        SockList_AddString(&sl, "addme_success");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        if (ns->sc_version < 1027 || ns->cs_version < 1023) {
            print_ext_msg(ns, NDI_RED, MSG_TYPE_ADMIN, MSG_TYPE_ADMIN_VERSION,
                          "Warning: Your client is too old to receive map data. Please update to a new client at: "
                          "https://sourceforge.net/projects/crossfire/");
        }
    }
    settings = oldsettings;
}
 
static void send_smooth(socket_struct *ns, const Face *face) {
    const Face *smoothface;
    SockList sl;
 
    // A malicious client can send bogus asksmooth commands that don't
    // translate to any face. Catch those here before the message below
    // in order to avoid a segfault.
    if (!face) {
        LOG(llevError, "Tried to smooth null face.\n");
        return;
    }
 
    // Try to find a smoothing face, or the default smoothing face. If this
    // fails, set NS_FACESENT_SMOOTH so we don't try to send it again.
    //
    // Failures are usually due to map makers changing the face of a ground
    // tile, but forgetting to unset smoothlevel.
    if (!find_smooth(face, &smoothface)
    && !find_smooth(smooth_face, &smoothface)) {
        LOG(llevInfo,
            "Could not smooth face %s. "
            "Check that this face has a smoothing pixmap, or remove its smoothlevel.\n",
            face->name);
        ns->faces_sent[face->number] |= NS_FACESENT_SMOOTH;
        return;
    }
 
    if (!(ns->faces_sent[smoothface->number]&NS_FACESENT_FACE))
        esrv_send_face(ns, smoothface, 0);
 
    ns->faces_sent[face->number] |= NS_FACESENT_SMOOTH;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "smooth ");
    SockList_AddShort(&sl, face->number);
    SockList_AddShort(&sl, smoothface->number);
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
}
 
void ask_smooth_cmd(char *buf, int len, socket_struct *ns) {
    uint16_t facenid;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus ask_smooth_cmd information\n", ns->host);
        return;
    }
 
    facenid = atoi(buf);
    send_smooth(ns, get_face_by_id(facenid));
}
 
void new_player_cmd(uint8_t *buf, int len, player *pl) {
    int time, repeat;
    short packet;
    char command[MAX_BUF];
    SockList sl;
 
    if (len < 7) {
        LOG(llevDebug, "Corrupt ncom command - not long enough - discarding\n");
        return;
    }
 
    packet = GetShort_String(buf);
    repeat = GetInt_String(buf+2);
    /* -1 is special - no repeat, but don't update */
    if (repeat != -1) {
        pl->count = repeat;
    }
    if (len-4 >= MAX_BUF)
        len = MAX_BUF-5;
 
    strncpy(command, (char *)buf+6, len-4);
    command[len-4] = '\0';
 
    /* The following should never happen with a proper or honest client.
     * Therefore, the error message doesn't have to be too clear - if
     * someone is playing with a hacked/non working client, this gives them
     * an idea of the problem, but they deserve what they get
     */
    if (pl->state != ST_PLAYING) {
        draw_ext_info_format(NDI_UNIQUE, 0, pl->ob, MSG_TYPE_COMMAND, MSG_TYPE_COMMAND_ERROR,
                             "You can not issue commands - state is not ST_PLAYING (%s)",
                             buf);
        return;
    }
 
    /* This should not happen anymore. */
    if (pl->ob->speed_left < 0) {
        LOG(llevError, "Player %s (%s) has negative time - shouldn't do command.\n",
            pl->ob->name ? pl->ob->name : "(unnamed)", pl->socket->account_name ? pl->socket->account_name : "(no account)");
    }
    ssop_t tmp = 1;
    if (setsockopt(pl->socket->fd, IPPROTO_TCP, TCP_NODELAY, &tmp, sizeof(tmp)))
        LOG(llevError, "send_tick: Unable to turn off TCP_NODELAY\n");
    command_execute(pl->ob, command);
    /* Perhaps something better should be done with a left over count.
     * Cleaning up the input should probably be done first - all actions
     * for the command that issued the count should be done before
     * any other commands.
     */
    pl->count = 0;
 
    /* Send confirmation of command execution now */
    SockList_Init(&sl);
    SockList_AddString(&sl, "comc ");
    SockList_AddShort(&sl, packet);
    if (FABS(pl->ob->speed) < 0.001)
        time = MAX_TIME*100;
    else
        time = (int)(MAX_TIME/FABS(pl->ob->speed));
    SockList_AddInt(&sl, time);
    Send_With_Handling(pl->socket, &sl);
    SockList_Term(&sl);
    tmp = 0;
    if (setsockopt(pl->socket->fd, IPPROTO_TCP, TCP_NODELAY, &tmp, sizeof(tmp)))
        LOG(llevError, "send_tick: Unable to turn on TCP_NODELAY\n");
}
 
void reply_cmd(char *buf, int len, player *pl) {
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "Player '%s' sent bogus reply_cmd information\n", pl->ob->name);
        return;
    }
 
    /* this avoids any hacking here */
 
    switch (pl->state) {
    case ST_PLAYING:
        LOG(llevError, "Got reply message with ST_PLAYING input state\n");
        break;
 
    case ST_PLAY_AGAIN:
        /* We can check this for return value (2==quit). Maybe we
         * should, and do something appropriate?
         */
        receive_play_again(pl->ob, buf[0]);
        break;
 
    case ST_ROLL_STAT:
        key_roll_stat(pl->ob, buf[0]);
        break;
 
    case ST_CHANGE_CLASS:
 
        key_change_class(pl->ob, buf[0]);
        break;
 
    case ST_CONFIRM_QUIT:
        key_confirm_quit(pl->ob, buf[0]);
        break;
 
    case ST_GET_NAME:
        receive_player_name(pl->ob, buf);
        break;
 
    case ST_GET_PASSWORD:
    case ST_CONFIRM_PASSWORD:
    case ST_CHANGE_PASSWORD_OLD:
    case ST_CHANGE_PASSWORD_NEW:
    case ST_CHANGE_PASSWORD_CONFIRM:
        receive_player_password(pl->ob, buf);
        break;
 
    case ST_GET_PARTY_PASSWORD:        /* Get password for party */
        receive_party_password(pl->ob, buf);
        break;
 
    default:
        LOG(llevError, "Unknown input state: %d\n", pl->state);
    }
}
 
void version_cmd(char *buf, int len, socket_struct *ns) {
    char *rest = NULL;
    char *cs_str = strtok_r(buf, " ", &rest);
    char *sc_str = strtok_r(NULL, " ", &rest);
    (void)len;
 
    if (cs_str == NULL || sc_str == NULL) {
        LOG(llevError, "%s: sent invalid version string\n", ns->host);
        return;
    } else {
        ns->cs_version = atoi(cs_str);
        ns->sc_version = atoi(sc_str);
    }
 
#ifdef ESRV_DEBUG
    if (VERSION_CS != ns->cs_version) {
        LOG(llevDebug, "CS: csversion mismatch (%d,%d)\n", VERSION_CS, ns->cs_version);
    }
 
    if (VERSION_SC != ns->sc_version) {
        LOG(llevDebug, "CS: scversion mismatch (%d,%d)\n", VERSION_SC, ns->sc_version);
    }
#endif
 
    if (rest != NULL) {
        LOG(llevInfo, "Connection from %s (%s), CS %d, SC %d\n",
            ns->host, rest, ns->cs_version, ns->sc_version);
    }
}
 
void map_newmap_cmd(socket_struct *ns) {
    SockList sl;
 
    /* If getting a newmap command, this scroll information
     * is no longer relevant.
     */
    ns->map_scroll_x = 0;
    ns->map_scroll_y = 0;
 
 
    memset(&ns->lastmap, 0, sizeof(ns->lastmap));
    SockList_Init(&sl);
    SockList_AddString(&sl, "newmap");
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
}
 
void move_cmd(char *buf, int len, player *pl) {
    int vals[3], i;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "Player '%s' sent bogus move_cmd information\n", pl->ob->name);
        return;
    }
 
    /* A little funky here. We only cycle for 2 records, because
     * we obviously am not going to find a space after the third
     * record. Perhaps we should just replace this with a
     * sscanf?
     */
    for (i = 0; i < 2; i++) {
        vals[i] = atoi(buf);
        if (!(buf = strchr(buf, ' '))) {
            LOG(llevError, "Incomplete move command: %s\n", buf);
            return;
        }
        buf++;
    }
    vals[2] = atoi(buf);
 
/*    LOG(llevDebug, "Move item %d (nrof=%d) to %d.\n", vals[1], vals[2], vals[0]);*/
    esrv_move_object(pl->ob, vals[0], vals[1], vals[2]);
}
 
/***************************************************************************
 *
 * Start of commands the server sends to the client.
 *
 ***************************************************************************
 */
 
void send_query(socket_struct *ns, uint8_t flags, const char *text) {
    SockList sl;
 
    SockList_Init(&sl);
    SockList_AddPrintf(&sl, "query %d %s", flags, text ? text : "");
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
}
 
#define AddIfInt64(Old, New, sl, Type)              \
    if (Old != New) {                               \
        Old = New;                                  \
        SockList_AddChar(sl, Type);                 \
        SockList_AddInt64(sl, New);                 \
    }
 
#define AddIfInt(Old, New, sl, Type)                \
    if (Old != New) {                               \
        Old = New;                                  \
        SockList_AddChar(sl, Type);                 \
        SockList_AddInt(sl, New);                   \
    }
 
#define AddIfShort(Old, New, sl, Type)              \
    if (Old != New) {                               \
        Old = New;                                  \
        SockList_AddChar(sl, Type);                 \
        SockList_AddShort(sl, New);                 \
    }
 
#define AddIfFloat(Old, New, sl, Type)              \
    if (Old != New) {                               \
        Old = New;                                  \
        SockList_AddChar(sl, Type);                 \
        SockList_AddInt(sl, (long)(New*FLOAT_MULTI));\
    }
 
#define AddIfString(Old, New, sl, Type)             \
    if (Old == NULL || strcmp(Old, New)) {          \
        free(Old);                                  \
        Old = strdup_local(New);                    \
        SockList_AddChar(sl, Type);                 \
        SockList_AddLen8Data(sl, New, strlen(New)); \
    }
 
static uint8_t is_perfect(const player *pl) {
    const int16_t until = MIN(11, pl->ob->level);
    for (int16_t i = 1; i < until; i++) {
        if (pl->levhp[i] < 9 || pl->levsp[i] < 6 || pl->levgrace[i] < 3) {
            return 0;
        }
    }
    return 1;
}
 
static void send_extra_stats(SockList *sl, player *pl) {
    uint32_t uflags = 0;
    const char *god = "none";
 
    if (pl->socket->notifications < 3) {
        return;
    }
 
    if (!pl->peaceful) {
        uflags |= CF_HOSTILE;
    }
    if (!is_perfect(pl)) {
        uflags |= CF_NOT_PERFECT;
    }
 
#define FIF(F, C) \
    if (QUERY_FLAG(pl->ob, F)) { \
        uflags |= C; \
    }
    FIF(FLAG_XRAYS, CF_XRAY);
    FIF(FLAG_CONFUSED, CF_CONFUSED);    // If confused by an item
    FIF(FLAG_STEALTH, CF_STEALTHY);
    FIF(FLAG_PARALYZED, CF_PARALYZED);
    FIF(FLAG_WIZ, CF_WIZARD);
 
    FOR_INV_PREPARE(pl->ob, item) {
        if (item->type == DISEASE && !QUERY_FLAG(item, FLAG_STARTEQUIP)) {
            uflags |= CF_DISEASED;
        }
        if (strcmp(item->arch->name, "poisoning") == 0) {
            uflags |= CF_POISONED;
        }
        if (strcmp(item->arch->name, "blindness") == 0) {
            uflags |= CF_BLIND;
        }
        if (item->type == FORCE && strcmp(item->name, "confusion") == 0) {
            uflags |= CF_CONFUSED;
        }
        if (item->type == SKILL && item->subtype == SK_PRAYING && item->title) {
            god = item->title;
        }
    }
    FOR_INV_FINISH();
 
    AddIfInt(pl->last_character_flags, uflags, sl, CS_STAT_CHARACTER_FLAGS);
    AddIfFloat(pl->last_character_load, pl->character_load, sl, CS_STAT_OVERLOAD);
    AddIfString(pl->socket->stats.god, god, sl, CS_STAT_GOD_NAME);
    AddIfShort(pl->last_item_power, pl->item_power, sl, CS_STAT_ITEM_POWER);
}
 
void esrv_update_stats(player *pl) {
    SockList sl;
    char buf[MAX_BUF];
    uint16_t flags;
    uint8_t s;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "stats ");
 
    if (pl->ob != NULL) {
        AddIfShort(pl->last_stats.hp, pl->ob->stats.hp, &sl, CS_STAT_HP);
        AddIfShort(pl->last_stats.maxhp, pl->ob->stats.maxhp, &sl, CS_STAT_MAXHP);
        AddIfShort(pl->last_stats.sp, pl->ob->stats.sp, &sl, CS_STAT_SP);
        AddIfShort(pl->last_stats.maxsp, pl->ob->stats.maxsp, &sl, CS_STAT_MAXSP);
        AddIfShort(pl->last_stats.grace, pl->ob->stats.grace, &sl, CS_STAT_GRACE);
        AddIfShort(pl->last_stats.maxgrace, pl->ob->stats.maxgrace, &sl, CS_STAT_MAXGRACE);
        AddIfShort(pl->last_stats.Str, pl->ob->stats.Str, &sl, CS_STAT_STR);
        AddIfShort(pl->last_stats.Int, pl->ob->stats.Int, &sl, CS_STAT_INT);
        AddIfShort(pl->last_stats.Pow, pl->ob->stats.Pow, &sl, CS_STAT_POW);
        AddIfShort(pl->last_stats.Wis, pl->ob->stats.Wis, &sl, CS_STAT_WIS);
        AddIfShort(pl->last_stats.Dex, pl->ob->stats.Dex, &sl, CS_STAT_DEX);
        AddIfShort(pl->last_stats.Con, pl->ob->stats.Con, &sl, CS_STAT_CON);
        AddIfShort(pl->last_stats.Cha, pl->ob->stats.Cha, &sl, CS_STAT_CHA);
    }
    if (pl->socket->extended_stats) {
        int16_t golem_hp, golem_maxhp;
        AddIfShort(pl->last_orig_stats.Str, pl->orig_stats.Str, &sl, CS_STAT_BASE_STR);
        AddIfShort(pl->last_orig_stats.Int, pl->orig_stats.Int, &sl, CS_STAT_BASE_INT);
        AddIfShort(pl->last_orig_stats.Pow, pl->orig_stats.Pow, &sl, CS_STAT_BASE_POW);
        AddIfShort(pl->last_orig_stats.Wis, pl->orig_stats.Wis, &sl, CS_STAT_BASE_WIS);
        AddIfShort(pl->last_orig_stats.Dex, pl->orig_stats.Dex, &sl, CS_STAT_BASE_DEX);
        AddIfShort(pl->last_orig_stats.Con, pl->orig_stats.Con, &sl, CS_STAT_BASE_CON);
        AddIfShort(pl->last_orig_stats.Cha, pl->orig_stats.Cha, &sl, CS_STAT_BASE_CHA);
        if (pl->ob != NULL) {
            AddIfShort(pl->last_race_stats.Str, 20 + pl->ob->arch->clone.stats.Str, &sl, CS_STAT_RACE_STR);
            AddIfShort(pl->last_race_stats.Int, 20 + pl->ob->arch->clone.stats.Int, &sl, CS_STAT_RACE_INT);
            AddIfShort(pl->last_race_stats.Pow, 20 + pl->ob->arch->clone.stats.Pow, &sl, CS_STAT_RACE_POW);
            AddIfShort(pl->last_race_stats.Wis, 20 + pl->ob->arch->clone.stats.Wis, &sl, CS_STAT_RACE_WIS);
            AddIfShort(pl->last_race_stats.Dex, 20 + pl->ob->arch->clone.stats.Dex, &sl, CS_STAT_RACE_DEX);
            AddIfShort(pl->last_race_stats.Con, 20 + pl->ob->arch->clone.stats.Con, &sl, CS_STAT_RACE_CON);
            AddIfShort(pl->last_race_stats.Cha, 20 + pl->ob->arch->clone.stats.Cha, &sl, CS_STAT_RACE_CHA);
            AddIfShort(pl->last_applied_stats.Str, pl->applied_stats.Str, &sl, CS_STAT_APPLIED_STR);
            AddIfShort(pl->last_applied_stats.Int, pl->applied_stats.Int, &sl, CS_STAT_APPLIED_INT);
            AddIfShort(pl->last_applied_stats.Pow, pl->applied_stats.Pow, &sl, CS_STAT_APPLIED_POW);
            AddIfShort(pl->last_applied_stats.Wis, pl->applied_stats.Wis, &sl, CS_STAT_APPLIED_WIS);
            AddIfShort(pl->last_applied_stats.Dex, pl->applied_stats.Dex, &sl, CS_STAT_APPLIED_DEX);
            AddIfShort(pl->last_applied_stats.Con, pl->applied_stats.Con, &sl, CS_STAT_APPLIED_CON);
            AddIfShort(pl->last_applied_stats.Cha, pl->applied_stats.Cha, &sl, CS_STAT_APPLIED_CHA);
        }
        if (pl->ranges[range_golem]) {
            object *golem = pl->ranges[range_golem];
            if (QUERY_FLAG(golem, FLAG_REMOVED) || golem->count != pl->golem_count || QUERY_FLAG(golem, FLAG_FREED)) {
                golem_hp = 0;
                golem_maxhp = 0;
            } else {
                golem_hp = golem->stats.hp;
                golem_maxhp = golem->stats.maxhp;
            }
        } else {
            golem_hp = 0;
            golem_maxhp = 0;
        }
        /* send first the maxhp, so the client can set up the display */
        AddIfShort(pl->last_golem_maxhp, golem_maxhp, &sl, CS_STAT_GOLEM_MAXHP);
        AddIfShort(pl->last_golem_hp, golem_hp, &sl, CS_STAT_GOLEM_HP);
    }
 
    for (s = 0; s < MAX_SKILLS; s++) {
        if (pl->last_skill_ob[s]) {
            // Skill objects can be removed without updating last_skill_ob.
            // Clean them up here if that's the case.
            if (QUERY_FLAG(pl->last_skill_ob[s], FLAG_REMOVED)) {
                LOG(llevDebug, "pruning removed object from last_skill_ob\n");
                pl->last_skill_ob[s] = NULL;
                continue;
            }
 
            if (pl->last_skill_exp[s] != pl->last_skill_ob[s]->stats.exp) {
                /* Always send along the level if exp changes. This
                 * is only 1 extra byte, but keeps processing simpler.
                 */
                SockList_AddChar(&sl, (char)(get_skill_client_code(pl->last_skill_ob[s]->name) + CS_STAT_SKILLINFO));
                SockList_AddChar(&sl, (char)pl->last_skill_ob[s]->level);
                SockList_AddInt64(&sl, pl->last_skill_ob[s]->stats.exp);
                pl->last_skill_exp[s] = pl->last_skill_ob[s]->stats.exp;
            }
        }
    }
    AddIfInt64(pl->last_stats.exp, pl->ob->stats.exp, &sl, CS_STAT_EXP64);
    AddIfShort(pl->last_level, (char)pl->ob->level, &sl, CS_STAT_LEVEL);
    AddIfShort(pl->last_stats.wc, pl->ob->stats.wc, &sl, CS_STAT_WC);
    AddIfShort(pl->last_stats.ac, pl->ob->stats.ac, &sl, CS_STAT_AC);
    AddIfShort(pl->last_stats.dam, pl->ob->stats.dam, &sl, CS_STAT_DAM);
    AddIfFloat(pl->last_speed, pl->ob->speed, &sl, CS_STAT_SPEED);
    AddIfShort(pl->last_stats.food, pl->ob->stats.food, &sl, CS_STAT_FOOD);
    AddIfFloat(pl->last_weapon_sp, pl->ob->weapon_speed, &sl, CS_STAT_WEAP_SP);
    AddIfInt(pl->last_weight_limit, (int32_t)get_weight_limit(pl->ob->stats.Str), &sl, CS_STAT_WEIGHT_LIM);
    flags = 0;
    if (pl->fire_on)
        flags |= SF_FIREON;
    if (pl->run_on)
        flags |= SF_RUNON;
 
    AddIfShort(pl->last_flags, flags, &sl, CS_STAT_FLAGS);
    if (pl->socket->sc_version < 1025) {
        AddIfShort(pl->last_resist[ATNR_PHYSICAL], pl->ob->resist[ATNR_PHYSICAL], &sl, CS_STAT_ARMOUR);
    } else {
        int i;
 
        for (i = 0; i < NROFATTACKS; i++) {
            /* Skip ones we won't send */
            if (atnr_cs_stat[i] == -1)
                continue;
            AddIfShort(pl->last_resist[i], pl->ob->resist[i], &sl, (char)atnr_cs_stat[i]);
        }
    }
    if (pl->socket->monitor_spells) {
        AddIfInt(pl->last_path_attuned, pl->ob->path_attuned, &sl, CS_STAT_SPELL_ATTUNE);
        AddIfInt(pl->last_path_repelled, pl->ob->path_repelled, &sl, CS_STAT_SPELL_REPEL);
        AddIfInt(pl->last_path_denied, pl->ob->path_denied, &sl, CS_STAT_SPELL_DENY);
    }
    /* we want to use the new fire & run system in new client */
    rangetostring(pl->ob, buf, sizeof(buf));
    AddIfString(pl->socket->stats.range, buf, &sl, CS_STAT_RANGE);
    set_title(pl->ob, buf, sizeof(buf));
    AddIfString(pl->socket->stats.title, buf, &sl, CS_STAT_TITLE);
 
    send_extra_stats(&sl, pl);
 
    /* Only send it away if we have some actual data - 2 bytes for length, 6 for "stats ". */
    if (sl.len > 8) {
#ifdef ESRV_DEBUG
        LOG(llevDebug, "Sending stats command, %d bytes long.\n", sl.len);
#endif
        Send_With_Handling(pl->socket, &sl);
    }
    SockList_Term(&sl);
}
 
void esrv_new_player(player *pl, uint32_t weight) {
    SockList sl;
 
    pl->last_weight = weight;
 
    if (!(pl->socket->faces_sent[pl->ob->face->number]&NS_FACESENT_FACE))
        esrv_send_face(pl->socket, pl->ob->face, 0);
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "player ");
    SockList_AddInt(&sl, pl->ob->count);
    SockList_AddInt(&sl, weight);
    SockList_AddInt(&sl, pl->ob->face->number);
    SockList_AddLen8Data(&sl, pl->ob->name, strlen(pl->ob->name));
 
    Send_With_Handling(pl->socket, &sl);
    SockList_Term(&sl);
    SET_FLAG(pl->ob, FLAG_CLIENT_SENT);
}
 
void esrv_send_animation(socket_struct *ns, const Animations *anim) {
    SockList sl;
    int i;
 
    if (anim == NULL) {
        LOG(llevError, "esrv_send_anim NULL??\n");
        return;
    }
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "anim ");
    SockList_AddShort(&sl, anim->num);
    SockList_AddShort(&sl, 0); /* flags - not used right now */
    /* Build up the list of faces. Also, send any information (ie, the
     * the face itself) down to the client.
     */
    for (i = 0; i < anim->num_animations; i++) {
        if (!(ns->faces_sent[anim->faces[i]->number]&NS_FACESENT_FACE))
            esrv_send_face(ns, anim->faces[i], 0);
        /* flags - not used right now */
        SockList_AddShort(&sl, anim->faces[i]->number);
    }
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
    ns->anims_sent[anim->num] = 1;
}
 
/****************************************************************************
 *
 * Start of map related commands.
 *
 ****************************************************************************/
 
static void map_clearcell(struct map_cell_struct *cell, int face, int darkness) {
    cell->darkness = darkness;
    memset(cell->faces, face, sizeof(cell->faces));
}
 
#define MAX_HEAD_POS MAX(MAX_CLIENT_X, MAX_CLIENT_Y)
 
static const object *heads[MAX_HEAD_POS][MAX_HEAD_POS][MAP_LAYERS];
 
/****************************************************************************
 * This block is for map2 drawing related commands.
 * Note that the map2 still uses other functions.
 *
 ***************************************************************************/
 
static int map2_add_ob(int ax, int ay, int layer, const object *ob, SockList *sl, socket_struct *ns, int *has_obj, int is_head) {
    uint8_t nlayer, smoothlevel = 0;
    const object *head;
 
    assert(ob != NULL);
 
    head = HEAD(ob);
    const Face *face = ob->face;
 
    /* This is a multipart object, and we are not at the lower
     * right corner. So we need to store away the lower right corner.
     */
    if (!is_head && (head->arch->tail_x || head->arch->tail_y)
    && (head->arch->tail_x != ob->arch->clone.x || head->arch->tail_y != ob->arch->clone.y)) {
        int bx, by, l;
 
        /* Basically figure out where the offset is from where we
         * are right now. the ob->arch->clone.{x,y} values hold
         * the offset that this current piece is from the head,
         * and the tail is where the tail is from the head.
         * Note that bx and by will equal sx and sy if we are
         * already working on the bottom right corner. If ob is
         * the head, the clone values will be zero, so the right
         * thing will still happen.
         */
        bx = ax+head->arch->tail_x-ob->arch->clone.x;
        by = ay+head->arch->tail_y-ob->arch->clone.y;
 
        /* I don't think this can ever happen, but better to check
         * for it just in case.
         */
        if (bx < ax || by < ay) {
            LOG(llevError, "map2_add_ob: bx (%d) or by (%d) is less than ax (%d) or ay (%d)\n", bx, by, ax, ay);
            face = NULL;
        }
        /* the target position must be within +/-1 of our current
         * layer as the layers are defined. We are basically checking
         * to see if we have already stored this object away.
         */
        for (l = layer-1; l <= layer+1; l++) {
            if (l < 0 || l >= MAP_LAYERS)
                continue;
            if (heads[by][bx][l] == head)
                break;
        }
        /* Didn't find it.  So we need to store it away. Try to store it
         * on our original layer, and then move up a layer.
         */
        if (l == layer+2) {
            if (!heads[by][bx][layer])
                heads[by][bx][layer] = head;
            else if (layer+1 < MAP_LAYERS && !heads[by][bx][layer+1])
                heads[by][bx][layer+1] = head;
        }
        return 0;
        /* Ok - All done storing away the head for future use */
    } else {
        uint16_t face_num = face ? face->number : 0;
        (*has_obj)++;
        if (QUERY_FLAG(ob, FLAG_CLIENT_ANIM_SYNC)
        || QUERY_FLAG(ob, FLAG_CLIENT_ANIM_RANDOM)) {
            face_num = (ob->animation ? ob->animation->num : 0)|(1<<15);
            if (QUERY_FLAG(ob, FLAG_CLIENT_ANIM_SYNC))
                face_num |= ANIM_SYNC;
            else if (QUERY_FLAG(ob, FLAG_CLIENT_ANIM_RANDOM))
                face_num |= ANIM_RANDOM;
        }
        /* Since face_num includes the bits for the animation tag,
         * and we will store that away in the faces[] array, below
         * check works fine _except_ for the case where animation
         * speed chances.
         */
        if (ns->lastmap.cells[ax][ay].faces[layer] != face_num) {
            uint8_t len, anim_speed = 0, i;
 
            /* This block takes care of sending the actual face
             * to the client. */
            ns->lastmap.cells[ax][ay].faces[layer] = face_num;
 
            /* Now form the data packet */
            nlayer = MAP2_LAYER_START+layer;
 
            len = 2;
 
            if (ob->map && !MAP_NOSMOOTH(ob->map)) {
                smoothlevel = ob->smoothlevel;
                if (smoothlevel)
                    len++;
            }
 
            if (QUERY_FLAG(ob, FLAG_CLIENT_ANIM_SYNC)
            || QUERY_FLAG(ob, FLAG_CLIENT_ANIM_RANDOM)) {
                len++;
                /* 1/0.004 == 250, so this is a good cap for an
                 * upper limit */
                if (ob->anim_speed)
                    anim_speed = ob->anim_speed;
                else if (FABS(ob->speed) < 0.004)
                    anim_speed = 255;
                else if (FABS(ob->speed) >= 1.0)
                    anim_speed = 1;
                else
                    anim_speed = (int)(1.0/FABS(ob->speed));
 
                if (ob->animation && !ns->anims_sent[ob->animation->num])
                    esrv_send_animation(ns, ob->animation);
 
                /* If smoothing, need to send smoothing information
                 * for all faces in the animation sequence. Since
                 * smoothlevel is an object attribute,
                 * it applies to all faces.
                 */
                if (smoothlevel) {
                    for (i = 0; i < NUM_ANIMATIONS(ob); i++) {
                        if (!(ns->faces_sent[ob->animation->faces[i]->number]&NS_FACESENT_SMOOTH))
                            send_smooth(ns, ob->animation->faces[i]);
                    }
                }
            } else if (!(ns->faces_sent[face_num]&NS_FACESENT_FACE)) {
                esrv_send_face(ns, face, 0);
            }
 
            if (smoothlevel
            && !(ns->faces_sent[ob->face->number]&NS_FACESENT_SMOOTH))
                send_smooth(ns, ob->face);
 
            /* Length of packet */
            nlayer |= len<<5;
 
            SockList_AddChar(sl, nlayer);
            SockList_AddShort(sl, face_num);
            if (anim_speed)
                SockList_AddChar(sl, anim_speed);
            if (smoothlevel)
                SockList_AddChar(sl, smoothlevel);
            return 1;
        } /* Face is different */
    }
    return 0;
}
 
/* This function is used see if a layer needs to be cleared.
 * It updates the socklist, and returns 1 if the update is
 * needed, 0 otherwise.
 */
static int map2_delete_layer(int ax, int ay, int layer, SockList *sl, socket_struct *ns) {
    int nlayer;
 
    if (ns->lastmap.cells[ax][ay].faces[layer] != 0) {
        /* Now form the data packet */
        nlayer = 0x10+layer+(2<<5);
        SockList_AddChar(sl, nlayer);
        SockList_AddShort(sl, 0);
        ns->lastmap.cells[ax][ay].faces[layer] = 0;
        return 1;
    }
    return 0;
}
 
static int check_probe(int ax, int ay, const object *ob, SockList *sl, socket_struct *ns, int *has_obj, int *alive_layer) {
    int got_one = 0, poisoned = 0, diseased = 0;
    char name[60];
    int value, granularity;
    const object *probe;
 
    /* send hp bar if needed */
    if ((*alive_layer) != -1 || ob->head || !CAN_PROBE(ob))
        return 0;
 
    if (settings.always_show_hp == 2) {
        /* global hp bars are enabled */
        granularity = 30;
    } else if (settings.always_show_hp == 1 && ob->stats.hp < ob->stats.maxhp) {
        granularity = 30;
    } else {
        /* only give hp bars to monsters that have been probed */
        if (!QUERY_FLAG(ob, FLAG_PROBE)) {
            return 0;
        }
        probe = object_find_by_type_and_name(ob, FORCE, "probe_force");
        if (probe == NULL || probe->level < 15) {
            /* if probe is not null, this is an error, but well */
            return 0;
        }
 
        granularity = (probe->level - 14) / 3;
        if (granularity <= 0)
            granularity = 1;
        else if (granularity > 30)
            granularity = 30;
    }
 
    if (ob->stats.maxhp > 0) {
        value = (ob->stats.hp * granularity) / (ob->stats.maxhp);
 
        if (value < 0)
            value = 0;
        else if (value > granularity)
            value = granularity;
    } else
        value = 30;
 
    value = (value * 30) / granularity;
 
    if (object_present_in_ob(POISONING, ob) != NULL)
        poisoned = 1;
    if (object_present_in_ob(DISEASE, ob) != NULL)
        diseased = 1;
 
    if (value > 0) {
        archetype *dummy;
 
        snprintf(name, sizeof(name), "hpbar%s%s%s_%d",
            poisoned ? "_poisoned" : "",
            diseased ? "_diseased" : "",
            (!poisoned && !diseased) ? "_standard" : "",
            value);
        dummy = try_find_archetype(name);
        if (dummy != NULL) {
            got_one += map2_add_ob(ax, ay, MAP_LAYER_FLY2, &dummy->clone, sl, ns, has_obj, 0);
            (*alive_layer) = MAP_LAYER_FLY2;
        }
    }
 
    return got_one;
}
 
static int annotate_ob(int ax, int ay, const object *ob, SockList *sl, socket_struct *ns, int *has_obj, int *alive_layer) {
    int got_one = check_probe(ax, ay, ob, sl, ns, has_obj, alive_layer);
    if (QUERY_FLAG(ob, FLAG_ALIVE) && (QUERY_FLAG(ob, FLAG_UNAGGRESSIVE) || QUERY_FLAG(ob, FLAG_FRIENDLY)) && ob->type != PLAYER) {
        if (ob->msg != NULL || object_find_by_arch_name(ob, "npc_dialog")) {
            archetype *dummy = try_find_archetype("speechbubble");
            if (dummy != NULL) {
                got_one += map2_add_ob(ax, ay, MAP_LAYER_FLY2, &dummy->clone, sl, ns, has_obj, 0);
                (*alive_layer) = MAP_LAYER_FLY2;
            }
        }
    }
    return got_one;
}
 
/*
 * This function is used to check a space (ax, ay) whose only
 * data we may care about are any heads. Basically, this
 * space is out of direct view. This is only used with the
 * Map2 protocol.
 *
 * @param ax
 * viewport relative x-coordinate
 * @param ay
 * viewport relative y-coordinate
 * @param sl
 * the reply to append to
 * @param ns
 * the client socket
 */
static void check_space_for_heads(int ax, int ay, SockList *sl, socket_struct *ns) {
    int layer, got_one = 0, del_one = 0, oldlen, has_obj = 0;
    uint16_t coord;
 
    coord = MAP2_COORD_ENCODE(ax, ay, 0);
    oldlen = sl->len;
    SockList_AddShort(sl, coord);
 
    for (layer = 0; layer < MAP_LAYERS; layer++) {
        const object *head;
 
        head = heads[ay][ax][layer];
        if (head) {
            /* in this context, got_one should always increase
             * because heads should always point to data to really send.
             */
            got_one += map2_add_ob(ax, ay, layer, head, sl, ns, &has_obj, 1);
        } else {
            del_one += map2_delete_layer(ax, ay, layer, sl, ns);
        }
    }
    /* Note - if/when lighting information is added, some code is
     * needed here - lighting sources that are out of sight may still
     * extend into the viewable area.
     */
 
    /* If nothing to do for this space, we
     * can erase the coordinate bytes
     */
    if (!del_one && !got_one) {
        sl->len = oldlen;
    } else if (del_one && !has_obj) {
        /* If we're only deleting faces and not adding, and there
         * are not any faces on the space we care about,
         * more efficient
         * to send 0 as the type/len field.
         */
        sl->len = oldlen+2;         /* 2 bytes for coordinate */
        SockList_AddChar(sl, MAP2_TYPE_CLEAR);    /* Clear byte */
        SockList_AddChar(sl, 255);  /* Termination byte */
        // Reduce defreferences by passing the inner array offset instead of address of value
        map_clearcell(ns->lastmap.cells[ax] + ay, 0, 0);
    } else {
        SockList_AddChar(sl, 255);  /* Termination byte */
    }
}
 
static void draw_client_map2(object *pl) {
    int x, y, ax, ay, darkness, min_x, max_x, min_y, max_y, oldlen, layer;
    size_t startlen;
    int16_t nx, ny;
    SockList sl;
    uint16_t coord;
    mapstruct *m;
    // Dereference once. It should not change in the middle of processing.
    player *plyr = pl->contr;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "map2 ");
    startlen = sl.len;
 
    handle_scroll(plyr->socket, &sl);
 
    /* Init data to zero */
    memset(heads, 0, sizeof(heads));
 
    /* We could do this logic as conditionals in the if statement,
     * but that started to get a bit messy to look at.
     */
    min_x = pl->x-plyr->socket->mapx/2;
    min_y = pl->y-plyr->socket->mapy/2;
    max_x = pl->x+(plyr->socket->mapx+1)/2+MAX_HEAD_OFFSET;
    max_y = pl->y+(plyr->socket->mapy+1)/2+MAX_HEAD_OFFSET;
 
    /* x, y are the real map locations. ax, ay are viewport relative
     * locations.
     */
    ay = 0;
    for (y = min_y; y < max_y; y++, ay++) {
        ax = 0;
        for (x = min_x; x < max_x; x++, ax++) {
            /* If this space is out of the normal viewable area,
             * we only check the heads value. This is used to
             * handle big images - if they extend to a viewable
             * portion, we need to send just the lower right corner.
             */
            if (ax >= plyr->socket->mapx || ay >= plyr->socket->mapy) {
                check_space_for_heads(ax, ay, &sl, plyr->socket);
            } else {
                /* This space is within the viewport of the client. Due
                 * to walls or darkness, it may still not be visible.
                 */
 
                /* Meaning of darkness (see defines in LOS_* in los.c):
                 * LOS_NO_DARKNESS (0) - object is in plain sight, full brightness.
                 * 1 - MAX_DARKNESS - how dark the space is - higher
                 * value is darker space. If level is at max darkness,
                 * you can't see the space (too dark)
                 * LOS_BLOCKED (100) - space is blocked from sight.
                 */
                darkness = plyr->blocked_los[ax][ay];
 
                /* If the coordinates are not valid, or it is too
                 * dark to see, we tell the client as such
                 */
                nx = x;
                ny = y;
                m = get_map_from_coord(pl->map, &nx, &ny);
                coord = MAP2_COORD_ENCODE(ax, ay, 0);
 
                if (!m) {
                    /* space is out of map. Update space and clear
                     * values if this hasn't already been done.
                     * If the space is out of the map, it shouldn't
                     * have a head.
                     */
                    if (plyr->socket->lastmap.cells[ax][ay].darkness != 0) {
                        SockList_AddShort(&sl, coord);
                        SockList_AddChar(&sl, MAP2_TYPE_CLEAR);
                        SockList_AddChar(&sl, 255); /* Termination byte */
                        // Reduce dereferences by passing the inner array offset instead of address of value
                        map_clearcell(plyr->socket->lastmap.cells[ax] + ay, 0, 0);
                    }
                } else if (darkness >= MAX_LIGHT_RADII) {
                    /* This block deals with spaces that are not
                     * visible due to darkness or walls. Still
                     * need to send the heads for this space.
                     */
                    check_space_for_heads(ax, ay, &sl, plyr->socket);
                } else {
                    int have_darkness = 0, has_obj = 0, got_one = 0, del_one = 0, g1, alive_layer = -1, old_got;
 
                    /* In this block, the space is visible. */
 
                    /* Rather than try to figure out what everything
                     * that we might need to send is, then form the
                     * packet after that, we presume that we will in
                     * fact form a packet, and update the bits by what
                     * we do actually send. If we send nothing, we
                     * just back out sl.len to the old value, and no
                     * harm is done.
                     * I think this is simpler than doing a bunch of
                     * checks to see what if anything we need to send,
                     * setting the bits, then doing those checks again
                     * to add the real data.
                     */
 
                    oldlen = sl.len;
                    SockList_AddShort(&sl, coord);
 
                    /* Darkness changed */
                    if (plyr->socket->lastmap.cells[ax][ay].darkness != darkness
                        && plyr->socket->darkness) {
                        plyr->socket->lastmap.cells[ax][ay].darkness = darkness;
                        /* Darkness tag & length (length=1) */
                        SockList_AddChar(&sl, MAP2_TYPE_DARKNESS|(1<<5));
 
                        /* Convert darkness level (0-MAX_DARKNESS) to a value
                         * from 1 (dark) to 255 (bright) for the client.
                         * Darkness values of 0 (completely dark) are not sent,
                         * as the space is completely dark.
                         */
                        SockList_AddChar(&sl, 255-darkness*(256/MAX_LIGHT_RADII));
                        have_darkness = 1;
                    }
 
                    for (layer = 0; layer < MAP_LAYERS; layer++) {
                        const object *ob = GET_MAP_FACE_OBJ(m, nx, ny, layer);
 
                        /* Special case: send player itself if invisible */
                        if (!ob
                        && x == pl->x
                        && y == pl->y
                        && (pl->invisible&(pl->invisible < 50 ? 4 : 1))
                        && (layer == MAP_LAYER_LIVING1 || layer == MAP_LAYER_LIVING2))
                            ob = pl;
 
                        if (ob) {
                            g1 = has_obj;
                            old_got = got_one;
                            got_one += map2_add_ob(ax, ay, layer, ob, &sl, plyr->socket, &has_obj, 0);
 
                            /* if we added the face, or it is a monster's head, check probe spell */
                            if (got_one != old_got || (ob->head == NULL && ob->more))
                                got_one += annotate_ob(ax, ay, ob, &sl, plyr->socket, &has_obj, &alive_layer);
 
                            /* If we are just storing away the head
                             * for future use, then effectively this
                             * space/layer is blank, and we should clear
                             * it if needed.
                             */
                            if (g1 == has_obj) {
                                del_one += map2_delete_layer(ax, ay, layer, &sl, plyr->socket);
                            } else if (ob->head == NULL) {
                                /* for single-part items */
                                got_one += annotate_ob(ax, ay, ob, &sl, plyr->socket, &has_obj, &alive_layer);
                            }
                        } else {
                            if (layer != alive_layer)
                                del_one += map2_delete_layer(ax, ay, layer, &sl, plyr->socket);
                        }
                    }
                    /* If nothing to do for this space, we
                     * can erase the coordinate bytes
                     */
                    if (!del_one && !got_one && !have_darkness) {
                        sl.len = oldlen;
                    } else if (del_one && !has_obj) {
                        /* If we're only deleting faces and don't
                         * have any objs we care about, just clear
                         * space. Note it is possible we may have
                         * darkness, but if there is nothing on the
                         * space, darkness isn't all that interesting
                         * - we can send it when an object shows up.
                         */
                        sl.len = oldlen+2;          /* 2 bytes for coordinate */
                        SockList_AddChar(&sl, MAP2_TYPE_CLEAR);
                        SockList_AddChar(&sl, 255); /* Termination byte */
                        // Reduce dereferences by passing the inner array offset instead of address of value
                        map_clearcell(plyr->socket->lastmap.cells[ax] + ay, 0, 0);
                    } else {
                        SockList_AddChar(&sl, 255); /* Termination byte */
                    }
                }
            } /* else this is a viewable space */
        } /* for x loop */
    } /* for y loop */
 
    /* Only send this if there are in fact some differences. */
    if (sl.len > startlen) {
        Send_With_Handling(plyr->socket, &sl);
    }
    SockList_Term(&sl);
}
 
void draw_client_map(object *pl) {
    int i, j;
    int16_t ax, ay;
    int mflags;
    mapstruct *m, *pm;
    int min_x, min_y, max_x, max_y;
 
    if (pl->type != PLAYER) {
        LOG(llevError, "draw_client_map called with non player/non eric-server\n");
        return;
    }
 
    if (pl->contr->transport) {
        pm = pl->contr->transport->map;
    } else
        pm = pl->map;
 
    /* If player is just joining the game, he isn't here yet, so
     * the map can get swapped out. If so, don't try to send them
     * a map. All will be OK once they really log in.
     */
    if (pm == NULL || pm->in_memory != MAP_IN_MEMORY)
        return;
 
    /*
     * This block just makes sure all the spaces are properly
     * updated in terms of what they look like.
     */
    min_x = pl->x-pl->contr->socket->mapx/2;
    min_y = pl->y-pl->contr->socket->mapy/2;
    max_x = pl->x+(pl->contr->socket->mapx+1)/2;
    max_y = pl->y+(pl->contr->socket->mapy+1)/2;
    for (j = min_y; j < max_y; j++) {
        for (i = min_x; i < max_x; i++) {
            ax = i;
            ay = j;
            m = pm;
            mflags = get_map_flags(m, &m, ax, ay, &ax, &ay);
            if (mflags&P_OUT_OF_MAP)
                continue;
            if (mflags&P_NEED_UPDATE)
                update_position(m, ax, ay);
            /* If a map is visible to the player, we don't want
             * to swap it out just to reload it. This should
             * really call something like swap_map, but this is
             * much more efficient and 'good enough'
             */
            if (mflags&P_NEW_MAP)
                m->timeout = 50;
        }
    }
 
    /* do LOS after calls to update_position */
    if (pl->contr->do_los) {
        update_los(pl);
        pl->contr->do_los = 0;
    }
 
    draw_client_map2(pl);
}
 
void esrv_map_scroll(socket_struct *ns, int dx, int dy) {
    struct Map newmap;
    int x, y, mx, my;
 
    ns->map_scroll_x += dx;
    ns->map_scroll_y += dy;
 
    mx = ns->mapx+MAX_HEAD_OFFSET;
    my = ns->mapy+MAX_HEAD_OFFSET;
 
    /* the x and y here are coordinates for the new map, i.e. if we moved
     * (dx,dy), newmap[x][y] = oldmap[x-dx][y-dy]. For this reason,
     * if the destination x or y coordinate is outside the viewable
     * area, we clear the values - otherwise, the old values
     * are preserved, and the check_head thinks it needs to clear them.
     */
    for (x = 0; x < mx; x++) {
        for (y = 0; y < my; y++) {
            if (x >= ns->mapx || y >= ns->mapy) {
                /* clear cells outside the viewable area */
                memset(&newmap.cells[x][y], 0, sizeof(newmap.cells[x][y]));
            } else if (x+dx < 0 || x+dx >= ns->mapx || y+dy < 0 || y+dy >= ns->mapy) {
                /* clear newly visible tiles within the viewable area */
                memset(&newmap.cells[x][y], 0, sizeof(newmap.cells[x][y]));
            } else {
                memcpy(&newmap.cells[x][y], &ns->lastmap.cells[x+dx][y+dy], sizeof(newmap.cells[x][y]));
            }
        }
    }
 
    memcpy(&ns->lastmap, &newmap, sizeof(ns->lastmap));
}
 
void send_plugin_custom_message(object *pl, char *buf) {
    SockList sl;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, buf);
    Send_With_Handling(pl->contr->socket, &sl);
    SockList_Term(&sl);
}
 
void esrv_update_spells(player *pl) {
    SockList sl;
    int flags = 0;
    client_spell *spell_info;
 
    if (!pl->socket || !pl->socket->monitor_spells)
        return;
 
    /* Handles problem at login, where this is called from fix_object
     * before we have had a chance to send spells to the player. It does seem
     * to me that there should never be a case where update_spells is called
     * before add_spells has been called. Add_spells() will update the
     * spell_state to non null.
     */
    if (!pl->spell_state)
        return;
 
    FOR_INV_PREPARE(pl->ob, spell) {
        if (spell->type == SPELL) {
            spell_info = get_client_spell_state(pl, spell);
            /* check if we need to update it*/
            if (spell_info->last_sp != SP_level_spellpoint_cost(pl->ob, spell, SPELL_MANA)) {
                spell_info->last_sp = SP_level_spellpoint_cost(pl->ob, spell, SPELL_MANA);
                flags |= UPD_SP_MANA;
            }
            if (spell_info->last_grace != SP_level_spellpoint_cost(pl->ob, spell, SPELL_GRACE)) {
                spell_info->last_grace = SP_level_spellpoint_cost(pl->ob, spell, SPELL_GRACE);
                flags |= UPD_SP_GRACE;
            }
            if (spell_info->last_dam != spell->stats.dam+SP_level_dam_adjust(pl->ob, spell)) {
                spell_info->last_dam = spell->stats.dam+SP_level_dam_adjust(pl->ob, spell);
                flags |= UPD_SP_DAMAGE;
            }
            if (flags != 0) {
                SockList_Init(&sl);
                SockList_AddString(&sl, "updspell ");
                SockList_AddChar(&sl, flags);
                SockList_AddInt(&sl, spell->count);
                if (flags&UPD_SP_MANA)
                    SockList_AddShort(&sl, spell_info->last_sp);
                if (flags&UPD_SP_GRACE)
                    SockList_AddShort(&sl, spell_info->last_grace);
                if (flags&UPD_SP_DAMAGE)
                    SockList_AddShort(&sl, spell_info->last_dam);
                flags = 0;
                Send_With_Handling(pl->socket, &sl);
                SockList_Term(&sl);
            }
        }
    } FOR_INV_FINISH();
}
 
void esrv_remove_spell(player *pl, object *spell) {
    SockList sl;
 
    if (!pl || !spell || spell->env != pl->ob) {
        LOG(llevError, "Invalid call to esrv_remove_spell\n");
        return;
    }
    if (!pl->socket->monitor_spells)
        return;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "delspell ");
    SockList_AddInt(&sl, spell->count);
    Send_With_Handling(pl->socket, &sl);
    SockList_Term(&sl);
}
 
void esrv_send_pickup(player *pl) {
    SockList sl;
 
    if (!pl->socket->want_pickup)
        return;
    SockList_Init(&sl);
    SockList_AddString(&sl, "pickup ");
    SockList_AddInt(&sl, pl->mode);
    Send_With_Handling(pl->socket, &sl);
    SockList_Term(&sl);
}
 
static int spell_client_use(const object *spell) {
    switch (spell->type)
    {
        case SP_RAISE_DEAD:
        case SP_MAKE_MARK:
            return 3;
        case SP_RUNE:
            if (!spell->other_arch)
                return 1;
            break;
        case SP_CREATE_FOOD:
        case SP_CREATE_MISSILE:
            return 2;
        case SP_SUMMON_MONSTER:
            if (spell->randomitems != NULL)
                return 2;
            /* break; */// If add conditins below, use this break statement
    }
    // This is not in the switch statement so that it supports fallthrough logic
    // on the few spell types that have additional conditions attached.
    return 0;
}
 
static void append_spell(player *pl, SockList *sl, object *spell) {
    client_spell *spell_info;
    int len, i, skill = 0;
 
    if (!spell->name) {
        LOG(llevError, "item number %d is a spell with no name.\n", spell->count);
        return;
    }
 
    if (spell->face && !(pl->socket->faces_sent[spell->face->number]&NS_FACESENT_FACE))
        esrv_send_face(pl->socket, spell->face, 0);
 
    spell_info = get_client_spell_state(pl, spell);
    SockList_AddInt(sl, spell->count);
    SockList_AddShort(sl, spell->level);
    SockList_AddShort(sl, spell->casting_time);
    /* store costs and damage in the object struct, to compare to later */
    spell_info->last_sp = SP_level_spellpoint_cost(pl->ob, spell, SPELL_MANA);
    spell_info->last_grace = SP_level_spellpoint_cost(pl->ob, spell, SPELL_GRACE);
    spell_info->last_dam = spell->stats.dam+SP_level_dam_adjust(pl->ob, spell);
    /* send the current values */
    SockList_AddShort(sl, spell_info->last_sp);
    SockList_AddShort(sl, spell_info->last_grace);
    SockList_AddShort(sl, spell_info->last_dam);
 
    /* figure out which skill it uses, if it uses one */
    if (spell->skill) {
        for (i = 0; i < MAX_SKILLS && skill_names[i]; i++)
            if (!strcmp(spell->skill, skill_names[i])) {
                skill = i+CS_STAT_SKILLINFO;
                break;
            }
    }
    SockList_AddChar(sl, skill);
 
    SockList_AddInt(sl, spell->path_attuned);
    SockList_AddInt(sl, spell->face ? spell->face->number : 0);
    SockList_AddLen8Data(sl, spell->name, strlen(spell->name));
 
    if (!spell->msg) {
        SockList_AddShort(sl, 0);
    } else {
        len = strlen(spell->msg);
        SockList_AddShort(sl, len);
        SockList_AddData(sl, spell->msg, len);
    }
 
    /* Extended spell information available if the client wants it.
     */
    if (pl->socket->monitor_spells >= 2) {
        /* spellmon 2
         */
        sstring req = object_get_value(spell, "casting_requirements");
 
        SockList_AddChar(sl, spell_client_use(spell));  /* Usage code */
 
        if (req) {                                      /* Requirements */
            SockList_AddLen8Data(sl, req, strlen(req));
        } else {
            SockList_AddChar(sl, 0);
        }
        /* end spellmon 2
         */
    }
}
 
void esrv_add_spells(player *pl, object *spell) {
    SockList sl;
    size_t size;
    sstring value;
 
    if (!pl) {
        LOG(llevError, "esrv_add_spells, tried to add a spell to a NULL player\n");
        return;
    }
 
    if (!pl->socket->monitor_spells)
        return;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "addspell ");
    if (!spell) {
        FOR_INV_PREPARE(pl->ob, spell) {
            if (spell->type != SPELL)
                continue;
            /* Were we to simply keep appending data here, we could
             * exceed the SockList buffer if the player has enough spells
             * to add. We know that append_spell will always append
             * 23 data bytes, plus 3 length bytes and 2 strings
             * (because that is the spec) so we need to check that
             * the length of those 2 strings, plus the 26 bytes,
             * won't take us over the length limit for the socket.
             * If it does, we need to send what we already have,
             * and restart packet formation.
             */
            size = 26+strlen(spell->name)+(spell->msg ? strlen(spell->msg) : 0);
            if (pl->socket->monitor_spells >= 2) {
                value = object_get_value(spell, "casting_requirements");
                size += 2 + (value ? strlen(value) : 0);
            }
            if (SockList_Avail(&sl) < size) {
                Send_With_Handling(pl->socket, &sl);
                SockList_Reset(&sl);
                SockList_AddString(&sl, "addspell ");
            }
            append_spell(pl, &sl, spell);
        } FOR_INV_FINISH();
    } else if (spell->type != SPELL) {
        LOG(llevError, "Asked to send a non-spell object as a spell\n");
        return;
    } else
        append_spell(pl, &sl, spell);
    /* finally, we can send the packet */
    Send_With_Handling(pl->socket, &sl);
    SockList_Term(&sl);
}
 
/* sends a 'tick' information to the client.
 * We also take the opportunity to toggle TCP_NODELAY -
 * this forces the data in the socket to be flushed sooner to the
 * client - otherwise, the OS tries to wait for full packets
 * and will this hold sending the data for some amount of time,
 * which thus adds some additional latency.
 */
void send_tick(player *pl) {
    SockList sl;
    ssop_t tmp;
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "tick ");
    SockList_AddInt(&sl, pticks);
    tmp = 1;
    if (setsockopt(pl->socket->fd, IPPROTO_TCP, TCP_NODELAY, &tmp, sizeof(tmp)))
        LOG(llevError, "send_tick: Unable to turn on TCP_NODELAY\n");
 
    Send_With_Handling(pl->socket, &sl);
    tmp = 0;
    if (setsockopt(pl->socket->fd, IPPROTO_TCP, TCP_NODELAY, &tmp, sizeof(tmp)))
        LOG(llevError, "send_tick: Unable to turn off TCP_NODELAY\n");
    SockList_Term(&sl);
}
 
static void add_char_field(SockList *sl, int type, const char *data)
{
    int len;
 
    len = strlen(data);
 
    if (len) {
        /* one extra for length for the type byte */
        SockList_AddChar(sl, len+1);
        SockList_AddChar(sl, type);
        SockList_AddString(sl, data);
    }
}
 
void send_account_players(socket_struct *ns)
{
    SockList sl;
    int num_chars;
    linked_char *extra;
 
    if (ns->account_chars) {
        account_char_free(ns->account_chars);
    }
    ns->account_chars = account_char_load(ns->account_name);
 
    num_chars = 0;
    extra = account_get_additional_chars(ns->account_name, ns->account_chars, &num_chars);
 
    SockList_Init(&sl);
    SockList_AddString(&sl, "accountplayers ");
 
    SockList_AddChar(&sl, static_cast<char>(ns->account_chars->chars.size() + num_chars));
 
    /* Now add real character data */
    for (auto acn : ns->account_chars->chars) {
        uint16_t faceno = 0;
 
        /* Ignore a dead character. They don't need to show up. */
        if (acn->isDead) {
            continue;
        }
 
        add_char_field(&sl, ACL_NAME, acn->name);
        add_char_field(&sl, ACL_CLASS, acn->character_class);
        add_char_field(&sl, ACL_RACE, acn->race);
        add_char_field(&sl, ACL_FACE, acn->face);
        if (acn->face[0] != 0 ) {
            const Face *face = try_find_face(acn->face, NULL);
 
            if (face != NULL) {
                if (!(ns->faces_sent[face->number]&NS_FACESENT_FACE)) {
                    esrv_send_face(ns, face, 0);
                }
                faceno = face->number;
            }
        }
 
        add_char_field(&sl, ACL_PARTY, acn->party);
        add_char_field(&sl, ACL_MAP, acn->map);
        SockList_AddChar(&sl, 3);
        SockList_AddChar(&sl, ACL_LEVEL);
        SockList_AddShort(&sl, acn->level);
        if (faceno) {
            SockList_AddChar(&sl, 3);
            SockList_AddChar(&sl, ACL_FACE_NUM);
            SockList_AddShort(&sl, faceno);
        }
 
        SockList_AddChar(&sl, 0);
    }
    /* Now for any characters where we just have the name */
    for (linked_char *e = extra; e != NULL; e = e->next) {
        add_char_field(&sl, ACL_NAME, e->name);
        SockList_AddChar(&sl, 0);
    }
 
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
 
    if (extra) {
        free_charlinks(extra);
    }
}
 
static int decode_name_password(const char *buf, int *len, char *name, char *password)
{
    int nlen, plen;
 
    if (*len < 2) {
        return 1;
    }
 
    nlen = (unsigned char)buf[0];
    if (nlen >= MAX_BUF || nlen > *len-2) {
        return 1;
    }
    memcpy(name, buf+1, nlen);
    name[nlen] = 0;
 
    plen = (unsigned char)buf[nlen+1];
    if (plen >= MAX_BUF || plen > *len-2-nlen) {
        return 2;
    }
    memcpy(password, buf+2+nlen, plen);
    password[plen] = 0;
 
    *len = nlen+plen+2;
 
    return 0;
}
void account_login_cmd(char *buf, int len, socket_struct *ns) {
    char name[MAX_BUF], password[MAX_BUF];
    int status;
    SockList sl;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus add_player_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    status = decode_name_password(buf, &len, name, password);
 
    if (status == 1) {
        SockList_AddString(&sl, "failure accountlogin Name is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    if (status == 2) {
        SockList_AddString(&sl, "failure accountlogin Password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (!account_exists(name)) {
        SockList_AddString(&sl, "failure accountlogin No such account name exists on this server");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (account_login(name, password)) {
        LOG(llevInfo, "Account login for '%s' from %s\n", name, ns->host);
 
        if (ns->account_name) free(ns->account_name);
        /* We want to store away official name so we do not
         * have any case sensitivity issues on the files.
         * because we have already checked password, we
         * know that account_exists should never return NULL in
         * this case.
         */
        ns->account_name = strdup_local(account_exists(name));
 
        send_account_players(ns);
    } else {
        LOG(llevInfo, "Failed account login for '%s' from %s\n", name, ns->host);
        SockList_AddString(&sl, "failure accountlogin Incorrect password for account");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
    }
}
 
static int account_block_create(const socket_struct *ns) {
    /* Check if account creation is blocked. */
    if(!settings.account_block_create) {
        /* Account creation is allowed for everyone. */
        return 0;
    }
 
    /* Has the trusted host been defined? */
    if(settings.account_trusted_host == NULL) {
      /* No, allocate it and set it to localhost now. */
      settings.account_trusted_host = strdup_local("127.0.0.1");
    }
 
    /* Return false if the client connected from the trusted host. */
    if(strcmp(ns->host, settings.account_trusted_host) == 0){
      return 0;
    }
 
    /*
     * If we are here, then we are blocking account create and we do
     * not trust this client's IP address.
     */
    return 1;
}
 
void account_new_cmd(char *buf, int len, socket_struct *ns) {
    char name[MAX_BUF], password[MAX_BUF];
    int status;
    SockList sl;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus add_player_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    status = decode_name_password(buf, &len, name, password);
 
    if (account_block_create(ns)) {
        LOG(llevInfo, "Account create blocked from %s\n", ns->host);
        SockList_AddString(&sl, "failure accountnew Account creation is disabled");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (status == 1) {
        SockList_AddString(&sl, "failure accountnew Name is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    if (status == 2) {
        SockList_AddString(&sl, "failure accountnew Password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    /*The minimum length isn't exactly required, but in the current implementation,
     * client will send the same password for character for which there is a
     * 2 character minimum size. Thus an account with a one character password
     * won't be able to create a character. */
    if (strlen(name)<settings.min_name) {
        SockList_AddString(&sl, "failure accountnew Name is too short");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    if (strlen(password)<2) {
        SockList_AddString(&sl, "failure accountnew Password is too short");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (account_exists(name)) {
        SockList_AddString(&sl, "failure accountnew That account already exists on this server");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = account_check_string(name);
    if (status == 1) {
        SockList_AddString(&sl,
                       "failure accountnew Choose a different account name. " VALIDCHAR_MSG);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (status == 2) {
        SockList_AddString(&sl,
                           "failure accountnew That account name is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = account_check_string(password);
    if (status == 1) {
        SockList_AddString(&sl,
                       "failure accountnew Choose a different password. " VALIDCHAR_MSG);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (status == 2) {
        SockList_AddString(&sl,
                           "failure accountnew That password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* If we got here, we passed all checks - so now add it */
    if (ns->account_name) free(ns->account_name);
    ns->account_name = strdup_local(name);
    account_new(name, password);
    /* save account information */
    accounts_save();
    send_account_players(ns);
}
 
void account_add_player_cmd(char *buf, int len, socket_struct *ns) {
    char name[MAX_BUF], password[MAX_BUF];
    int status, force, nlen;
    SockList sl;
    const char *cp;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus add_player_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    if (ns->account_name == NULL) {
        SockList_AddString(&sl, "failure accountaddplayer Not logged in");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    force = buf[0];
    nlen = len - 1;
    status = decode_name_password(buf+1, &nlen, name, password);
    if (status == 1) {
        SockList_AddString(&sl, "failure accountaddplayer Name is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    if (status == 2) {
        SockList_AddString(&sl, "failure accountaddplayer Password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = verify_player(name, password);
    if (status) {
        /* From a security standpoint, telling random folks if it
         * it as wrong password makes it easier to hack.  However,
         * it is fairly easy to determine what characters exist on a server
         * (either by trying to create a new one and see if the name is in
         * in use, or just looking at the high score file), so this
         * really does not make things much less secure
         */
        if (status == 1)
            SockList_AddString(&sl, "failure accountaddplayer 0 The character does not exist.");
        else
            SockList_AddString(&sl, "failure accountaddplayer 0 That password is incorrect.");
 
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    /* Check to see if this character is associated with an account.
     */
    cp = account_get_account_for_char(name);
    if (cp) {
        if (!strcmp(cp, ns->account_name)) {
            SockList_AddString(&sl, "failure accountaddplayer 0 That character is already connected to this account.");
            Send_With_Handling(ns, &sl);
            SockList_Term(&sl);
            return;
        } else {
            if (!force) {
                SockList_AddString(&sl, "failure accountaddplayer 1 That character is already connected to a different account.");
                Send_With_Handling(ns, &sl);
                SockList_Term(&sl);
                return;
            } else if (account_is_logged_in(cp)) {
                /* We could be clever and try to handle this case, but it is
                 * trickier.  If the character is logged in, it has to
                 * be logged out.  And the socket holds some data which
                 * needs to be cleaned up.  Since it should be fairly
                 * uncommon that users need to do this, just disallowing
                 * it makes things a lot simpler.
                 */
                SockList_AddString(&sl, "failure accountaddplayer 0 That character is already connected to a different account which is currently logged in.");
                Send_With_Handling(ns, &sl);
                SockList_Term(&sl);
                return;
            }
        }
    }
    /* If we have gotten this far, the name/password provided is OK,
     * and the character is not associated with a different account (or
     * force is true).  Now try to add the character to this account.
     */
    status = account_link(ns->account_name, name);
 
    /* This should never happen, but check for it just in case -
     * if we were able to log in, the account should exist.  but
     * if this fails, need to give the user some clue.
     */
    if (status==1) {
        SockList_AddString(&sl, "failure accountaddplayer 0 Could not find your account.");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    } else if (status == 2) {
        SockList_AddString(&sl, "failure accountaddplayer 0 You have reached the maximum number of characters allowed per account.");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* If cp is set, then this character used to belong to a different
     * account.  Remove it now.
     */
    if (cp) {
        Account_Chars *chars;
 
        account_remove_player(cp, name);
        chars = account_char_load(cp);
        account_char_remove(chars, name);
        account_char_save(chars);
        account_char_free(chars);
    }
 
    send_account_players(ns);
 
    /* store data so nothing is lost in case of crash */
    account_char_save(ns->account_chars);
}
 
void account_play_cmd(char *buf, int len, socket_struct *ns)
{
    char **chars;
    int i;
    SockList sl;
    player *pl;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus account_play_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    if (ns->status != Ns_Add) {
        SockList_AddString(&sl, "failure accountplay Not allowed right now");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (!buf[0]) {
        SockList_AddString(&sl, "failure accountplay Malformed character name");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (ns->account_name == NULL) {
        SockList_AddString(&sl, "failure accountplay Not logged in");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* Make sure a client is not trying to spoof us here */
    chars = account_get_players_for_account(ns->account_name);
 
    for (i=0; chars[i]; i++) {
        if (strcmp(chars[i], buf) == 0)
            break;
    }
    if (!chars[i]) {
        SockList_AddPrintf(&sl,
                           "failure accountplay Character %s is not associated with account %s",
                           buf, ns->account_name);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    for (pl = first_player; pl; pl = pl->next) {
        if (pl->ob && pl->socket != ns && strcmp(buf, pl->ob->name) == 0 && pl->state != ST_PLAY_AGAIN && pl->state != ST_GET_NAME) {
            SockList_AddPrintf(&sl,
                               "failure accountplay Character %s is already playing",
                               buf);
            Send_With_Handling(ns, &sl);
            SockList_Term(&sl);
            return;
        }
    }
 
    /* from a protocol standpoint, accountplay can be used
     * before there is a player structure (first login) or after
     * (character has logged in and is changing characters).
     * Checkthe sockets for that second case - if so,
     * we don't need to make a new player object, etc.
     */
    for (pl=first_player; pl; pl=pl->next) {
        if (pl->socket == ns) {
            /* The player still in the socket must be saved first. */
            save_player(pl->ob, 0);
            break;
        }
    }
 
    /* Some of this logic is from add_player()
     * we just don't use add_player() as it does some other work
     * we don't really want to do.
     */
    if (!pl) {
        pl = get_player(NULL);
        set_player_socket(pl, ns);
        ns->status = Ns_Avail;
        ns->account_chars = NULL;
        SockList_ResetRead(&pl->socket->inbuf);
    } else {
        pl->state = ST_PLAYING;
    }
 
    pl->ob->name = add_string(buf);
    check_login(pl->ob, NULL);
 
    SockList_AddString(&sl, "addme_success");
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
}
 
#define MAX_CHOICES 100
 
void create_player_cmd(char *buf, int len, socket_struct *ns)
{
    char name[MAX_BUF], password[MAX_BUF], *choices[MAX_CHOICES];
    int status, nlen, choice_num=0, i;
    SockList sl;
    player *pl;
    archetype *map=NULL, *race_a=NULL, *class_a=NULL;
    living  new_stats;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus create_player_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    if (ns->status != Ns_Add) {
        SockList_AddString(&sl, "failure createplayer Not allowed right now");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    nlen = len;
    status = decode_name_password(buf, &nlen, name, password);
    if (status == 1) {
        SockList_AddString(&sl, "failure createplayer Name is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* Minimum character name limit (if set) */
    if (strlen(name)<settings.min_name) {
        SockList_AddString(&sl, "failure createplayer Name is too short");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (playername_ok(name) == 0) {
        SockList_AddString(&sl, "failure createplayer Player name contains invalid characters");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* 2 characters minimum for password */
    if (strlen(password)<2) {
        SockList_AddString(&sl, "failure createplayer Password is too short");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (status == 2) {
        SockList_AddString(&sl, "failure createplayer Password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* This is a fairly ugly solution - we're truncating the password.
     * however, the password information for characters is really
     * a legacy issue - when every character is associated with
     * an account, legacy login (character name/password) will get
     * removed, at which point the only use for password might be
     * to move characters from one account to another, but not sure
     * if that is something we want to allow.
     */
    if (strlen(password)>17)
        password[16] = 0;
 
    /* We just can't call check_name(), since that uses draw_info() to
     * report status.  We are also more permissive on names, so we use
     * account_check_string() - if that is safe for account, also safe
     * for player names.
     */
    if (account_check_string(name)) {
        SockList_AddString(&sl, "failure createplayer Choose a different character name. " VALIDCHAR_MSG);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* 1 means no such player, 0 is correct name/password (which in this
     * case, is an error), and 2 is incorrect password. Only way we
     * go onward is if there is no such player.
     */
    if (verify_player(name, password) != 1) {
        SockList_AddString(&sl, "failure createplayer That name is already in use");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* from a protocol standpoint, accountplay can be used
     * before there is a player structure (first login) or after
     * (character has logged in and is changing characters).
     * Check the sockets for that second case - if so,
     * we don't need to make a new player object, etc.
     */
    for (pl=first_player; pl; pl=pl->next)
      if (pl->socket == ns) {
        if (pl->ob->name) {
          if (!strcmp(pl->ob->name, name)) {
              /* For some reason not only the socket is the same but also
               * the player is already playing. If this happens at this
               * point let's assume the character never was able to apply
               * a bet of reality to make a correct first-time save.
               * So, for safety remove it and start over.
               */
              if (!QUERY_FLAG(pl->ob, FLAG_REMOVED))
                object_remove(pl->ob);
          }
          else {
              /* If this is a different player on the same socket, then we
               * need to make sure that the old one is not connected to the player
               *
               * This prevents bizarre scenarios where the player is on the map
               * multiple times (from multiple createplayer commands), and
               * only one of them is controlled by the player.
               */
              if (pl->ob->contr == pl) {
                  if (!QUERY_FLAG(pl->ob, FLAG_REMOVED))
                      object_remove(pl->ob);
              }
          }
        }
        break;
      }
 
    /* In this mode, we have additional data
     * Note that because there are a lot of failure cases in here
     * (where we end up not creating the new player), the code
     * to create the new player is done within this routine
     * after all checks pass.  Note that all of the checks
     * done are done without using the player structure,
     * as pl may be null right now.
     */
    if (ns->login_method >= 2) {
        int i, j, stat_total=0;
        char *key, *value, *race=NULL, *class_name=NULL;
 
        /* By setting this to zero, then we can easily
         * check to see if all stats have been set.
         */
        memset(&new_stats, 0, sizeof(living));
 
        while (nlen < len) {
            i = buf[nlen];  /* Length of this line */
            /* Sanity check from client - don't want to loop
             * forever if there is a 0 length, and don't
             * want to read beyond size of packet.
             * Likewise, client should have sent
             * the string to us already null terminated,
             * but we will just make sure.
             */
            if ((i == 0) || (nlen + i > len)) break;
            buf[nlen + i] = 0;
 
            /* What we have are a series of lines -
             * 'key value' format.  Find that space,
             * and null it out so we can do strcasecmp.
             * If no space, abort processing
             */
            key = buf + nlen + 1;
            value = strchr(key, ' ');
            if (!value) break;
            *value = 0;
            value++;
 
            if (!strcasecmp(key,"race"))    race = value;
            else if (!strcasecmp(key,"class"))   class_name = value;
            else if (!strcasecmp(key,"starting_map")) {
                map = try_find_archetype(value);
                if (!map || map->clone.type != MAP || map->clone.subtype !=MAP_TYPE_CHOICE) {
                    SockList_AddString(&sl,
                               "failure createplayer Invalid starting map");
                    Send_With_Handling(ns, &sl);
                    SockList_Term(&sl);
                    return;
                }
            }
            else if (!strcasecmp(key,"choice")) {
                /* In general, MAX_CHOICES should be large enough
                 * to always handle the choices from the client - of
                 * course, the client could be broken and send us many
                 * more choices than we should have, so handle that.
                 */
                if (choice_num == MAX_CHOICES) {
                    LOG(llevError,
                        "Number of choices receive exceed max value: %d>%d\n",
                        choice_num, MAX_CHOICES);
                } else {
                    choices[choice_num] = value;
                    choice_num++;
                }
            }
            else {
                /* Do stat processing here */
                for (j=0; j < NUM_STATS; j++) {
                    if (!strcasecmp(key,short_stat_name[j])) {
                        int val = atoi(value);
 
                        set_attr_value(&new_stats, j, val);
                        break;
                    }
                }
                if (j >= NUM_STATS) {
                    /* Bad clients could do this - we should at least report
                     * it, and useful when trying to add new parameters.
                     */
                    LOG(llevError, "Got unknown key/value from client: %s %s\n", key, value);
                }
            }
            nlen += i + 1;
        }
        /* Do some sanity checking now.  But checking the stat
         * values here, we will catch any 0 values since we do
         * a memset above.  A properly behaving client should
         * never do any of these things, but we do not presume
         * clients will behave properly.
         */
        for (j=0; j<NUM_STATS; j++) {
            int val = get_attr_value(&new_stats, j);
 
            stat_total += val;
            if (val > settings.starting_stat_max ||
                val < settings.starting_stat_min) {
                SockList_AddPrintf(&sl,
                    "failure createplayer Stat value is out of range - %d must be between %d and %d",
                     val, settings.starting_stat_min, settings.starting_stat_max);
                Send_With_Handling(ns, &sl);
                SockList_Term(&sl);
                return;
            }
        }
        if (stat_total > settings.starting_stat_points) {
            SockList_AddPrintf(&sl,
                "failure createplayer Total allocated statistics is higher than allowed (%d>%d)",
                stat_total, settings.starting_stat_points);
            Send_With_Handling(ns, &sl);
            SockList_Term(&sl);
            return;
        }
 
        if (race)
            race_a = try_find_archetype(race);
 
        if (class_name)
            class_a = try_find_archetype(class_name);
 
        /* This should never happen with a properly behaving client, so the error message
         * doesn't have to be that great.
         */
        if (!race_a || race_a->clone.type != PLAYER || !class_a || class_a->clone.type != CLASS) {
            SockList_AddString(&sl,
                               "failure createplayer Invalid or unknown race or class");
            Send_With_Handling(ns, &sl);
            SockList_Term(&sl);
            return;
        }
 
        /* At current time, only way this can fail is if the adjusted
         * stat is less than 1.
         */
        if (check_race_and_class(&new_stats, race_a, class_a)) {
            SockList_AddString(&sl,
                               "failure createplayer Unable to apply race or class - statistic is out of bounds");
            Send_With_Handling(ns, &sl);
            SockList_Term(&sl);
            return;
        }
 
        if (!pl)
            pl = add_player(ns, ADD_PLAYER_NEW | ADD_PLAYER_NO_MAP | ADD_PLAYER_NO_STATS_ROLL);
        // If we already have a player, we a replaying on the same connection.
        // Since add_player normally sets ns->status, we still need that to happen.
        else
            ns->status = Ns_Avail;
 
        // We need to copy the name in before apply_race_and_class() because it
        // tells the client our character name. If we don't update it, they get the old one.
        FREE_AND_COPY(pl->ob->name, name);
 
        apply_race_and_class(pl->ob, race_a, class_a, &new_stats);
 
    }  else {
        /* In thise case, old login method */
        if (!pl)
            pl = add_player(ns, ADD_PLAYER_NEW);
        // If we already have a player, we a replaying on the same connection.
        // Since add_player normally sets ns->status, we still need that to happen.
        else
            ns->status = Ns_Avail;
 
        // Make sure to do this on both code branches.
        FREE_AND_COPY(pl->ob->name, name);
/* already done by add_player
        roll_again(pl->ob);
        pl->state = ST_ROLL_STAT;
        set_first_map(pl->ob);*/
    }
 
    /* add_player does a lot of the work, but there are a few
     * things we need to update, like starting name and
     * password.
     * This is done before processing in login_method>2.
     * The character creation process it does when
     * applying the race/class will use this
     * name information.
     */
    FREE_AND_COPY(pl->ob->name_pl, name);
    pl->name_changed = 1;
    safe_strncpy(pl->password, newhash(password), sizeof(pl->password));
 
    SockList_AddString(&sl, "addme_success");
    Send_With_Handling(ns, &sl);
    SockList_Term(&sl);
 
    if (ns->login_method >= 2) {
        /* The client could have provided us a map - if so, map will be set
         * and we don't want to overwrite it
         */
        if (!map)
            map = get_archetype_by_type_subtype(MAP, MAP_TYPE_DEFAULT);
        assert(map); // Existence checked in init_dynamic()
 
        enter_exit(pl->ob, &map->clone);
 
        if (pl->ob->map == NULL) {
            LOG(llevError, "Couldn't put player %s on start map %s!", pl->ob->name, map->name);
            abort();
        }
 
        /* copy information to bed of reality information, in case the player dies */
        safe_strncpy(pl->savebed_map, pl->ob->map->path, sizeof(pl->savebed_map));
        pl->bed_x = pl->ob->x;
        pl->bed_y = pl->ob->y;
 
        player_set_state(pl, ST_PLAYING);
    }
 
    /* We insert any objects after we have put the player on the map -
     * this makes things safer, as certain objects may expect a normal
     * environment.  Note that choice_num will only be set in the
     * loginmethod > 2, which also checks (and errors out) if the
     * race/class is not set, which is why explicit checking for
     * those is not need.
     */
    for (i=0; i < choice_num; i++) {
        char *choiceval;
        const char *value, *cp;
        archetype *arch;
        object *op;
 
        choiceval = strchr(choices[i], ' ');
        if (!choiceval) {
            LOG(llevError, "Choice does not specify value: %s\n", choices[i]);
            continue;
        }
        *choiceval=0;
        choiceval++;
        value = object_get_value(&race_a->clone, choices[i]);
        if (!value)
            value = object_get_value(&class_a->clone, choices[i]);
 
        if (!value) {
            LOG(llevError, "Choice not found in archetype: %s\n", choices[i]);
            continue;
        }
        cp = strstr(value, choiceval);
        if (!cp) {
            LOG(llevError, "Choice value not found in archetype: %s %s\n",
                choices[i], choiceval);
            continue;
        }
 
        /* Check to make sure that the matched string is an entire word,
         * and not a substring (eg, valid choice being great_sword but
         * we just get sword) - the space after the match should either be a
         * space or null, and space before match should also be a space
         * or the start of the string.
         */
        if ((cp[strlen(choiceval)] != ' ') && (cp[strlen(choiceval)] != 0) &&
            (cp != value) && (*(cp-1) != ' ')) {
 
            LOG(llevError, "Choice value matches substring but not entire word: %s substring %s\n",
                choiceval, value);
            continue;
        }
        arch = try_find_archetype(choiceval);
        if (!arch) {
            LOG(llevError, "Choice value can not find archetype %s\n", choiceval);
            continue;
        }
        op = arch_to_object(arch);
        op = object_insert_in_ob(op, pl->ob);
        if (QUERY_FLAG(op, FLAG_AUTO_APPLY))
            ob_apply(op, pl->ob, 0);
    }
 
    LOG(llevInfo, "new character %s from %s\n", pl->ob->name, pl->ob->contr->socket->host);
    draw_ext_info_format(NDI_UNIQUE | NDI_ALL | NDI_DK_ORANGE, 5, NULL,
                         MSG_TYPE_ADMIN, MSG_TYPE_ADMIN_PLAYER,
                         "%s has entered the game.", pl->ob->name);
}
 
void account_password(char *buf, int len, socket_struct *ns) {
    char old[MAX_BUF], change[MAX_BUF];
    int status;
    SockList sl;
 
    if (len <= 0 || !buf) {
        LOG(llevDebug, "IP '%s' sent bogus account_password_cmd information\n", ns->host);
        return;
    }
 
    SockList_Init(&sl);
 
    if (ns->account_name == NULL) {
        SockList_AddString(&sl, "failure accountpw Not logged in");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = decode_name_password(buf, &len, old, change);
    if (status == 1) {
        SockList_AddString(&sl, "failure accountpw Old password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    if (status == 2) {
        SockList_AddString(&sl, "failure accountpw New password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
    /*The minimum length isn't exactly required, but in the current implementation,
     * client will send the same password for character for which there is a
     * 2 character minimum size. Thus an account with a one character password
     * won't be able to create a character. */
    if (strlen(change)<2) {
        SockList_AddString(&sl, "failure accountpw New password is too short");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = account_check_string(change);
    if (status == 1) {
        SockList_AddString(&sl,
                       "failure accountpw Choose a different password. " VALIDCHAR_MSG);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    if (status == 2) {
        SockList_AddString(&sl,
                           "failure accountpw That password is too long");
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    status = account_change_password(ns->account_name, old, change);
    if (status != 0) {
        const char *error;
 
        if (status == 1) {
            error = "failure accountpw Illegal characters present";
        } else if (status == 2) {
            error = "failure accountpw Invalid account";
        } else {
            error = "failure accountpw Incorrect current password";
        }
 
        SockList_AddString(&sl, error);
        Send_With_Handling(ns, &sl);
        SockList_Term(&sl);
        return;
    }
 
    /* If we got here, we passed all checks, and password was changed */
    send_account_players(ns);
}