git.pond.sub.org Git - empserver/blob - src/lib/player/login.c

   1 /*
   2  *  Empire - A multi-player, client/server Internet based war game.
   3  *  Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                Ken Stevens, Steve McClure, Markus Armbruster
   5  *
   6  *  Empire is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  *  ---
  20  *
  21  *  See files README, COPYING and CREDITS in the root of the source
  22  *  tree for related information and legal notices.  It is expected
  23  *  that future projects/authors will amend these files as needed.
  24  *
  25  *  ---
  26  *
  27  *  login.c: Allow the player to login
  28  *
  29  *  Known contributors to this file:
  30  *     Dave Pare, 1994
  31  *     Steve McClure, 2000
  32  *     Markus Armbruster, 2004-2012
  33  *     Ron Koenderink, 2005-2009
  34  */
  35
  36 #include <config.h>
  37
  38 #include "com.h"
  39 #include "empio.h"
  40 #include "empthread.h"
  41 #include "file.h"
  42 #include "journal.h"
  43 #include "match.h"
  44 #include "misc.h"
  45 #include "nat.h"
  46 #include "nsc.h"
  47 #include "optlist.h"
  48 #include "player.h"
  49 #include "proto.h"
  50 #include "prototypes.h"
  51 #include "server.h"
  52
  53 static int client_cmd(void);
  54 static int coun_cmd(void);
  55 static int kill_cmd(void);
  56 static int options_cmd(void);
  57 static int pass_cmd(void);
  58 static int play_cmd(void);
  59 static int quit_cmd(void);
  60 static int sanc_cmd(void);
  61 static int user_cmd(void);
  62
  63 static struct cmndstr login_coms[] = {
  64     {"client client-id...", 0, client_cmd, 0, 0},
  65     {"coun country", 0, coun_cmd, 0, 0},
  66     {"kill", 0, kill_cmd, 0, 0},
  67     {"options option=value...", 0, options_cmd, 0, 0},
  68     {"pass password", 0, pass_cmd, 0, 0},
  69     {"play [user [country [password]]]", 0, play_cmd, 0, 0},
  70     {"quit", 0, quit_cmd, 0, 0},
  71     {"sanc", 0, sanc_cmd, 0, 0},
  72     {"user name", 0, user_cmd, 0, 0},
  73     {NULL, 0, NULL, 0, 0}
  74 };
  75
  76 /*ARGSUSED*/
  77 void
  78 player_login(void *ud)
  79 {
  80     time_t deadline;
  81     char buf[128];
  82     char space[128];
  83     int res, ac, cmd, prev_state;
  84
  85     player->proc = empth_self();
  86
  87     pr_id(player, C_INIT, "Empire server ready\n");
  88
  89     for (;;) {
  90         deadline = player_io_deadline(player, 0);
  91         if (io_outputwaiting(player->iop)) {
  92             if (io_output(player->iop, deadline) <= 0)
  93                 break;
  94             continue;
  95         }
  96         if (io_gets(player->iop, buf, sizeof(buf)) < 0) {
  97             res = io_input(player->iop, deadline);
  98             if (res <= 0) {
  99                 if (res == 0 && !io_eof(player->iop))
 100                     pr_id(player, C_DATA, "idle connection terminated\n");
 101                 break;
 102             }
 103             continue;
 104         }
 105         journal_input(buf);
 106         ac = parse(buf, space, player->argp, NULL, NULL, NULL);
 107         if (ac <= 0) {
 108             pr_id(player, C_BADCMD, "Can't parse command\n");
 109             continue;
 110         }
 111         cmd = comtch(player->argp[0], login_coms, 0);
 112         if (cmd < 0) {
 113             pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 114             continue;
 115         }
 116         switch (login_coms[cmd].c_addr()) {
 117         case RET_OK:
 118             break;
 119         case RET_FAIL:
 120             break;
 121         case RET_SYN:
 122             pr_id(player, C_BADCMD, "Usage %s\n", login_coms[cmd].c_form);
 123             break;
 124         default:
 125             break;
 126         }
 127     }
 128     prev_state = player->state;
 129     player->state = PS_SHUTDOWN;
 130     if (prev_state == PS_PLAYING)
 131         empth_rwlock_unlock(shutdown_lock);
 132     pr_id(player, C_EXIT, "so long...\n");
 133     player_delete(player);
 134     empth_exit();
 135     /*NOTREACHED*/
 136 }
 137
 138 static int
 139 client_cmd(void)
 140 {
 141     int i, sz;
 142     char *p, *end;
 143
 144     if (!player->argp[1])
 145         return RET_SYN;
 146
 147     p = player->client;
 148     end = player->client + sizeof(player->client) - 1;
 149     for (i = 1; player->argp[i]; ++i) {
 150         if (i > 1)
 151             *p++ = ' ';
 152         sz = strlen(player->argp[i]);
 153         sz = MIN(sz, end - p);
 154         memcpy(p, player->argp[i], sz);
 155         p += sz;
 156     }
 157     *p = 0;
 158     pr_id(player, C_CMDOK, "talking to %s\n", player->client);
 159     return RET_OK;
 160 }
 161
 162 static int
 163 user_cmd(void)
 164 {
 165     if (!player->argp[1])
 166         return RET_SYN;
 167     strncpy(player->userid, player->argp[1], sizeof(player->userid) - 1);
 168     player->userid[sizeof(player->userid) - 1] = '\0';
 169     pr_id(player, C_CMDOK, "hello %s\n", player->userid);
 170     return RET_OK;
 171 }
 172
 173 static int
 174 sanc_cmd(void)
 175 {
 176     struct nstr_item ni;
 177     struct natstr nat;
 178     int first = 1;
 179
 180     if (!opt_BLITZ) {
 181         pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 182         return RET_FAIL;
 183     }
 184
 185     snxtitem_all(&ni, EF_NATION);
 186     while (nxtitem(&ni, &nat)) {
 187         if (nat.nat_stat != STAT_SANCT)
 188             continue;
 189         if (first) {
 190             pr_id(player, C_DATA,
 191                   "The following countries are still in sanctuary:\n");
 192             first = 0;
 193         }
 194         pr_id(player, C_DATA, "%s\n", nat.nat_cnam);
 195     }
 196     if (first)
 197         pr_id(player, C_CMDOK, "There are no countries in sanctuary\n");
 198     else
 199         pr_id(player, C_CMDOK, "\n");
 200     return RET_OK;
 201 }
 202
 203 static int
 204 coun_cmd(void)
 205 {
 206     natid cnum;
 207
 208     if (!player->argp[1])
 209         return RET_SYN;
 210     if (natbyname(player->argp[1], &cnum) < 0) {
 211         pr_id(player, C_CMDERR, "country %s does not exist\n", player->argp[1]);
 212         return RET_FAIL;
 213     }
 214     player->cnum = cnum;
 215     player->authenticated = 0;
 216     pr_id(player, C_CMDOK, "country name %s\n", player->argp[1]);
 217     return 0;
 218 }
 219
 220 static int
 221 pass_cmd(void)
 222 {
 223     if (!player->argp[1])
 224         return RET_SYN;
 225     if (player->cnum == NATID_BAD) {
 226         pr_id(player, C_CMDERR, "need country first\n");
 227         return RET_FAIL;
 228     }
 229     if (!natpass(player->cnum, player->argp[1])) {
 230         pr_id(player, C_CMDERR, "password bad, logging entry\n");
 231         logerror("%s tried country #%d with %s",
 232                  praddr(player), player->cnum, player->argp[1]);
 233         return RET_FAIL;
 234     }
 235     player->authenticated = 1;
 236     pr_id(player, C_CMDOK, "password ok\n");
 237     logerror("%s using country #%d", praddr(player), player->cnum);
 238     return RET_OK;
 239 }
 240
 241 static int
 242 options_cmd(void)
 243 {
 244     /*
 245      * The option mechanism allows arbitrary string values, but so far
 246      * all options are flags in struct player.  Should be easy to
 247      * generalize if needed.
 248      */
 249     struct logoptstr {
 250         char *name;
 251         int val;
 252     };
 253     static struct logoptstr login_opts[] = {
 254         { "utf-8", PF_UTF8 },
 255         { NULL, 0 }
 256     };
 257     char **ap;
 258     char *p;
 259     int opt;
 260     unsigned i;
 261
 262     if (!player->argp[1]) {
 263         for (i = 0; login_opts[i].name; ++i)
 264             pr_id(player, C_DATA, "%s=%d\n",
 265                   login_opts[i].name,
 266                   (player->flags & login_opts[i].val) != 0);
 267         pr_id(player, C_CMDOK, "\n");
 268         return RET_OK;
 269     }
 270
 271     for (ap = player->argp+1; *ap; ++ap) {
 272         p = strchr(*ap, '=');
 273         if (p)
 274             *p++ = 0;
 275         opt = stmtch(*ap, login_opts,
 276                      offsetof(struct logoptstr, name),
 277                      sizeof(struct logoptstr));
 278         if (opt < 0) {
 279             pr_id(player, C_BADCMD, "Option %s not found\n", *ap);
 280             return RET_FAIL;
 281         }
 282         if (!p || atoi(p))
 283             player->flags |= login_opts[opt].val;
 284         else
 285             player->flags &= ~login_opts[opt].val;
 286     }
 287
 288     pr_id(player, C_CMDOK, "Accepted\n");
 289
 290     return RET_OK;
 291 }
 292
 293 static int
 294 may_play(void)
 295 {
 296     struct natstr *np;
 297
 298     if (player->cnum == NATID_BAD || !player->authenticated) {
 299         pr_id(player, C_CMDERR, "need country and password\n");
 300         return 0;
 301     }
 302     /* TODO strstr() cheesy, compare IP against IP/BITS ... */
 303     np = getnatp(player->cnum);
 304     if (np->nat_stat == STAT_GOD && *privip
 305         && !strstr(privip, player->hostaddr)) {
 306         logerror("Deity login from untrusted host attempted by %s",
 307                  praddr(player));
 308         logerror("To allow this, add %s to econfig key privip",
 309                  player->hostaddr);
 310         pr_id(player, C_EXIT,
 311               "Deity login not allowed from this IP!"
 312               "  See log for help on how to allow it.\n");
 313         return 0;
 314     }
 315     return 1;
 316 }
 317
 318 static int
 319 play_cmd(void)
 320 {
 321     struct player *other;
 322     natid cnum;
 323     struct natstr *natp;
 324     char **ap;
 325     char buf[128];
 326
 327     ap = player->argp;
 328     if (*++ap) {
 329         strncpy(player->userid, *ap, sizeof(player->userid) - 1);
 330         player->userid[sizeof(player->userid) - 1] = '\0';
 331         player->authenticated = 0;
 332     }
 333     if (*++ap) {
 334         if (natbyname(*ap, &cnum) < 0) {
 335             pr_id(player, C_CMDERR, "country %s does not exist\n", *ap);
 336             return RET_FAIL;
 337         }
 338     }
 339     if (*++ap) {
 340         if (!natpass(cnum, *ap)) {
 341             pr_id(player, C_CMDERR, "password bad, logging entry\n");
 342             logerror("%s tried country #%d with %s",
 343                      praddr(player), cnum, *ap);
 344             return RET_FAIL;
 345         }
 346         player->cnum = cnum;
 347         player->authenticated = 1;
 348     }
 349     if (!may_play())
 350         return RET_FAIL;
 351     other = getplayer(player->cnum);
 352     if (other) {
 353         natp = getnatp(player->cnum);
 354         if (natp->nat_stat != STAT_VIS) {
 355             pr_id(player, C_EXIT, "country in use by %s\n", praddr(other));
 356         } else {
 357             pr_id(player, C_EXIT, "country in use\n");
 358         }
 359         return RET_FAIL;
 360     }
 361     snprintf(buf, sizeof(buf), "Play#%d", player->cnum);
 362     empth_set_name(empth_self(), buf);
 363     logerror("%s logged in as country #%d", praddr(player), player->cnum);
 364     pr_id(player, C_INIT, "%d\n", CLIENTPROTO);
 365     empth_rwlock_rdlock(shutdown_lock);
 366     player->state = PS_PLAYING;
 367     player_main(player);
 368     logerror("%s logged out, country #%d", praddr(player), player->cnum);
 369     if (!io_eof(player->iop) && !io_error(player->iop))
 370         io_set_eof(player->iop);
 371     return RET_OK;
 372 }
 373
 374 static int
 375 kill_cmd(void)
 376 {
 377     struct player *other;
 378
 379     if (!may_play())
 380         return RET_FAIL;
 381     other = getplayer(player->cnum);
 382     if (!other) {
 383         pr_id(player, C_EXIT, "country not in use\n");
 384         return RET_FAIL;
 385     }
 386     logerror("%s killed country #%d", praddr(player), player->cnum);
 387     pr_flash(other, "Disconnected by %s\n", praddr(player));
 388     io_set_eof(other->iop);
 389     other->aborted = 1;
 390     other->may_sleep = PLAYER_SLEEP_NEVER;
 391     empth_wakeup(other->proc);
 392     pr_id(player, C_EXIT, "terminated %s's connection\n", praddr(other));
 393     return RET_OK;
 394 }
 395
 396 static int
 397 quit_cmd(void)
 398 {
 399     io_set_eof(player->iop);
 400     return RET_OK;
 401 }