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
  52 static int client_cmd(void);
  53 static int coun_cmd(void);
  54 static int kill_cmd(void);
  55 static int options_cmd(void);
  56 static int pass_cmd(void);
  57 static int play_cmd(void);
  58 static int quit_cmd(void);
  59 static int sanc_cmd(void);
  60 static int user_cmd(void);
  61
  62 static struct cmndstr login_coms[] = {
  63     {"client client-id...", 0, client_cmd, 0, 0},
  64     {"coun country", 0, coun_cmd, 0, 0},
  65     {"kill", 0, kill_cmd, 0, 0},
  66     {"options option=value...", 0, options_cmd, 0, 0},
  67     {"pass password", 0, pass_cmd, 0, 0},
  68     {"play [user [country [password]]]", 0, play_cmd, 0, 0},
  69     {"quit", 0, quit_cmd, 0, 0},
  70     {"sanc", 0, sanc_cmd, 0, 0},
  71     {"user name", 0, user_cmd, 0, 0},
  72     {NULL, 0, NULL, 0, 0}
  73 };
  74
  75 /*ARGSUSED*/
  76 void
  77 player_login(void *ud)
  78 {
  79     struct timeval timeout;
  80     char buf[128];
  81     char space[128];
  82     int ac;
  83     int cmd;
  84     int res;
  85
  86     player->proc = empth_self();
  87
  88     pr_id(player, C_INIT, "Empire server ready\n");
  89
  90     for (;;) {
  91         io_output(player->iop, 1);
  92         if (io_gets(player->iop, buf, sizeof(buf)) < 0) {
  93             io_timeout(&timeout, player->curup + minutes(max_idle));
  94             res = io_input(player->iop, &timeout);
  95             if (res <= 0) {
  96                 if (res == 0 && !io_eof(player->iop))
  97                     pr_id(player, C_DATA, "idle connection terminated\n");
  98                 break;
  99             }
 100             continue;
 101         }
 102         journal_input(buf);
 103         ac = parse(buf, space, player->argp, NULL, NULL, NULL);
 104         if (ac <= 0) {
 105             pr_id(player, C_BADCMD, "Can't parse command\n");
 106             continue;
 107         }
 108         cmd = comtch(player->argp[0], login_coms, 0);
 109         if (cmd < 0) {
 110             pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 111             continue;
 112         }
 113         switch (login_coms[cmd].c_addr()) {
 114         case RET_OK:
 115             break;
 116         case RET_FAIL:
 117             break;
 118         case RET_SYN:
 119             pr_id(player, C_BADCMD, "Usage %s\n", login_coms[cmd].c_form);
 120             break;
 121         default:
 122             break;
 123         }
 124     }
 125     player->state = PS_SHUTDOWN;
 126     pr_id(player, C_EXIT, "so long...\n");
 127     player_delete(player);
 128     empth_exit();
 129     /*NOTREACHED*/
 130 }
 131
 132 static int
 133 client_cmd(void)
 134 {
 135     int i, sz;
 136     char *p, *end;
 137
 138     if (!player->argp[1])
 139         return RET_SYN;
 140
 141     p = player->client;
 142     end = player->client + sizeof(player->client) - 1;
 143     for (i = 1; player->argp[i]; ++i) {
 144         if (i > 1)
 145             *p++ = ' ';
 146         sz = strlen(player->argp[i]);
 147         sz = MIN(sz, end - p);
 148         memcpy(p, player->argp[i], sz);
 149         p += sz;
 150     }
 151     *p = 0;
 152     pr_id(player, C_CMDOK, "talking to %s\n", player->client);
 153     return RET_OK;
 154 }
 155
 156 static int
 157 user_cmd(void)
 158 {
 159     if (!player->argp[1])
 160         return RET_SYN;
 161     strncpy(player->userid, player->argp[1], sizeof(player->userid) - 1);
 162     player->userid[sizeof(player->userid) - 1] = '\0';
 163     pr_id(player, C_CMDOK, "hello %s\n", player->userid);
 164     return RET_OK;
 165 }
 166
 167 static int
 168 sanc_cmd(void)
 169 {
 170     struct nstr_item ni;
 171     struct natstr nat;
 172     int first = 1;
 173
 174     if (!opt_BLITZ) {
 175         pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 176         return RET_FAIL;
 177     }
 178
 179     snxtitem_all(&ni, EF_NATION);
 180     while (nxtitem(&ni, &nat)) {
 181         if (nat.nat_stat != STAT_SANCT)
 182             continue;
 183         if (first) {
 184             pr_id(player, C_DATA,
 185                   "The following countries are still in sanctuary:\n");
 186             first = 0;
 187         }
 188         pr_id(player, C_DATA, "%s\n", nat.nat_cnam);
 189     }
 190     if (first)
 191         pr_id(player, C_CMDOK, "There are no countries in sanctuary\n");
 192     else
 193         pr_id(player, C_CMDOK, "\n");
 194     return RET_OK;
 195 }
 196
 197 static int
 198 coun_cmd(void)
 199 {
 200     natid cnum;
 201
 202     if (!player->argp[1])
 203         return RET_SYN;
 204     if (natbyname(player->argp[1], &cnum) < 0) {
 205         pr_id(player, C_CMDERR, "country %s does not exist\n", player->argp[1]);
 206         return RET_FAIL;
 207     }
 208     player->cnum = cnum;
 209     player->authenticated = 0;
 210     pr_id(player, C_CMDOK, "country name %s\n", player->argp[1]);
 211     return 0;
 212 }
 213
 214 static int
 215 pass_cmd(void)
 216 {
 217     if (!player->argp[1])
 218         return RET_SYN;
 219     if (player->cnum == NATID_BAD) {
 220         pr_id(player, C_CMDERR, "need country first\n");
 221         return RET_FAIL;
 222     }
 223     if (!natpass(player->cnum, player->argp[1])) {
 224         pr_id(player, C_CMDERR, "password bad, logging entry\n");
 225         logerror("%s tried country #%d with %s",
 226                  praddr(player), player->cnum, player->argp[1]);
 227         return RET_FAIL;
 228     }
 229     player->authenticated = 1;
 230     pr_id(player, C_CMDOK, "password ok\n");
 231     logerror("%s using country #%d", praddr(player), player->cnum);
 232     return RET_OK;
 233 }
 234
 235 static int
 236 options_cmd(void)
 237 {
 238     /*
 239      * The option mechanism allows arbitrary string values, but so far
 240      * all options are flags in struct player.  Should be easy to
 241      * generalize if needed.
 242      */
 243     struct logoptstr {
 244         char *name;
 245         int val;
 246     };
 247     static struct logoptstr login_opts[] = {
 248         { "utf-8", PF_UTF8 },
 249         { NULL, 0 }
 250     };
 251     char **ap;
 252     char *p;
 253     int opt;
 254     unsigned i;
 255
 256     if (!player->argp[1]) {
 257         for (i = 0; login_opts[i].name; ++i)
 258             pr_id(player, C_DATA, "%s=%d\n",
 259                   login_opts[i].name,
 260                   (player->flags & login_opts[i].val) != 0);
 261         pr_id(player, C_CMDOK, "\n");
 262         return RET_OK;
 263     }
 264
 265     for (ap = player->argp+1; *ap; ++ap) {
 266         p = strchr(*ap, '=');
 267         if (p)
 268             *p++ = 0;
 269         opt = stmtch(*ap, login_opts,
 270                      offsetof(struct logoptstr, name),
 271                      sizeof(struct logoptstr));
 272         if (opt < 0) {
 273             pr_id(player, C_BADCMD, "Option %s not found\n", *ap);
 274             return RET_FAIL;
 275         }
 276         if (!p || atoi(p))
 277             player->flags |= login_opts[opt].val;
 278         else
 279             player->flags &= ~login_opts[opt].val;
 280     }
 281
 282     pr_id(player, C_CMDOK, "Accepted\n");
 283
 284     return RET_OK;
 285 }
 286
 287 static int
 288 may_play(void)
 289 {
 290     struct natstr *np;
 291
 292     if (player->cnum == NATID_BAD || !player->authenticated) {
 293         pr_id(player, C_CMDERR, "need country and password\n");
 294         return 0;
 295     }
 296     /* TODO strstr() cheesy, compare IP against IP/BITS ... */
 297     np = getnatp(player->cnum);
 298     if (np->nat_stat == STAT_GOD && *privip
 299         && !strstr(privip, player->hostaddr)) {
 300         logerror("Deity login from untrusted host attempted by %s",
 301                  praddr(player));
 302         logerror("To allow this, add %s to econfig key privip",
 303                  player->hostaddr);
 304         pr_id(player, C_EXIT,
 305               "Deity login not allowed from this IP!"
 306               "  See log for help on how to allow it.\n");
 307         return 0;
 308     }
 309     return 1;
 310 }
 311
 312 static int
 313 play_cmd(void)
 314 {
 315     struct player *other;
 316     natid cnum;
 317     struct natstr *natp;
 318     char **ap;
 319     char buf[128];
 320
 321     ap = player->argp;
 322     if (*++ap) {
 323         strncpy(player->userid, *ap, sizeof(player->userid) - 1);
 324         player->userid[sizeof(player->userid) - 1] = '\0';
 325         player->authenticated = 0;
 326     }
 327     if (*++ap) {
 328         if (natbyname(*ap, &cnum) < 0) {
 329             pr_id(player, C_CMDERR, "country %s does not exist\n", *ap);
 330             return RET_FAIL;
 331         }
 332     }
 333     if (*++ap) {
 334         if (!natpass(cnum, *ap)) {
 335             pr_id(player, C_CMDERR, "password bad, logging entry\n");
 336             logerror("%s tried country #%d with %s",
 337                      praddr(player), cnum, *ap);
 338             return RET_FAIL;
 339         }
 340         player->cnum = cnum;
 341         player->authenticated = 1;
 342     }
 343     if (!may_play())
 344         return RET_FAIL;
 345     other = getplayer(player->cnum);
 346     if (other) {
 347         natp = getnatp(player->cnum);
 348         if (natp->nat_stat != STAT_VIS) {
 349             pr_id(player, C_EXIT, "country in use by %s\n", praddr(other));
 350         } else {
 351             pr_id(player, C_EXIT, "country in use\n");
 352         }
 353         return RET_FAIL;
 354     }
 355     snprintf(buf, sizeof(buf), "Play#%d", player->cnum);
 356     empth_set_name(empth_self(), buf);
 357     logerror("%s logged in as country #%d", praddr(player), player->cnum);
 358     pr_id(player, C_INIT, "%d\n", CLIENTPROTO);
 359     player->state = PS_PLAYING;
 360     player_main(player);
 361     logerror("%s logged out, country #%d", praddr(player), player->cnum);
 362     if (!io_eof(player->iop) && !io_error(player->iop))
 363         io_set_eof(player->iop);
 364     return RET_OK;
 365 }
 366
 367 static int
 368 kill_cmd(void)
 369 {
 370     struct player *other;
 371
 372     if (!may_play())
 373         return RET_FAIL;
 374     other = getplayer(player->cnum);
 375     if (!other) {
 376         pr_id(player, C_EXIT, "country not in use\n");
 377         return RET_FAIL;
 378     }
 379     logerror("%s killed country #%d", praddr(player), player->cnum);
 380     io_shutdown(other->iop, IO_READ | IO_WRITE);
 381     pr_id(player, C_EXIT, "closed socket of offending job\n");
 382     return RET_OK;
 383 }
 384
 385 static int
 386 quit_cmd(void)
 387 {
 388     io_set_eof(player->iop);
 389     return RET_OK;
 390 }