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) 1986-2010, Dave Pare, Jeff Bailey, Thomas Ruschak,
   4  *                           Ken Stevens, Steve McClure
   5  *
   6  *  This program 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 2 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, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ---
  21  *
  22  *  See files README, COPYING and CREDITS in the root of the source
  23  *  tree for related information and legal notices.  It is expected
  24  *  that future projects/authors will amend these files as needed.
  25  *
  26  *  ---
  27  *
  28  *  login.c: Allow the player to login
  29  *
  30  *  Known contributors to this file:
  31  *     Dave Pare, 1994
  32  *     Steve McClure, 2000
  33  *     Markus Armbruster, 2004-2009
  34  *     Ron Koenderink, 2005-2009
  35  */
  36
  37 #include <config.h>
  38
  39 #include "com.h"
  40 #include "empio.h"
  41 #include "empthread.h"
  42 #include "file.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     char buf[128];
  80     char space[128];
  81     int ac;
  82     int cmd;
  83     int res;
  84
  85     player->proc = empth_self();
  86
  87     pr_id(player, C_INIT, "Empire server ready\n");
  88
  89     while (player->state != PS_SHUTDOWN) {
  90         io_output(player->iop, 1);
  91         if (io_gets(player->iop, buf, sizeof(buf)) < 0) {
  92             res = io_input(player->iop, 1);
  93             if (res <= 0) {
  94                 if (res == 0 && !io_eof(player->iop))
  95                     pr_id(player, C_DATA, "idle connection terminated\n");
  96                 break;
  97             }
  98             continue;
  99         }
 100         ac = parse(buf, space, player->argp, NULL, NULL, NULL);
 101         cmd = comtch(player->argp[0], login_coms, 0);
 102         if (cmd < 0) {
 103             pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 104             continue;
 105         }
 106         switch (login_coms[cmd].c_addr()) {
 107         case RET_OK:
 108             break;
 109         case RET_FAIL:
 110             break;
 111         case RET_SYN:
 112             pr_id(player, C_BADCMD, "Usage %s\n", login_coms[cmd].c_form);
 113             break;
 114         default:
 115             break;
 116         }
 117     }
 118     player->state = PS_SHUTDOWN;
 119     if (!io_eof(player->iop)) {
 120         pr_id(player, C_EXIT, "so long...\n");
 121         while (io_output(player->iop, 1) > 0) ;
 122     }
 123     player_delete(player);
 124     empth_exit();
 125     /*NOTREACHED*/
 126 }
 127
 128 static int
 129 client_cmd(void)
 130 {
 131     int i, sz;
 132     char *p, *end;
 133
 134     if (!player->argp[1])
 135         return RET_SYN;
 136
 137     p = player->client;
 138     end = player->client + sizeof(player->client) - 1;
 139     for (i = 1; player->argp[i]; ++i) {
 140         if (i > 1)
 141             *p++ = ' ';
 142         sz = strlen(player->argp[i]);
 143         sz = MIN(sz, end - p);
 144         memcpy(p, player->argp[i], sz);
 145         p += sz;
 146     }
 147     *p = 0;
 148     pr_id(player, C_CMDOK, "talking to %s\n", player->client);
 149     return RET_OK;
 150 }
 151
 152 static int
 153 user_cmd(void)
 154 {
 155     if (!player->argp[1])
 156         return RET_SYN;
 157     strncpy(player->userid, player->argp[1], sizeof(player->userid) - 1);
 158     player->userid[sizeof(player->userid) - 1] = '\0';
 159     pr_id(player, C_CMDOK, "hello %s\n", player->userid);
 160     return RET_OK;
 161 }
 162
 163 static int
 164 sanc_cmd(void)
 165 {
 166     struct nstr_item ni;
 167     struct natstr nat;
 168     int first = 1;
 169
 170     if (!opt_BLITZ) {
 171         pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 172         return RET_FAIL;
 173     }
 174
 175     snxtitem_all(&ni, EF_NATION);
 176     while (nxtitem(&ni, &nat)) {
 177         if (nat.nat_stat != STAT_SANCT)
 178             continue;
 179         if (first) {
 180             pr_id(player, C_DATA,
 181                   "The following countries are still in sanctuary:\n");
 182             first = 0;
 183         }
 184         pr_id(player, C_DATA, "%s\n", nat.nat_cnam);
 185     }
 186     if (first)
 187         pr_id(player, C_CMDOK, "There are no countries in sanctuary\n");
 188     else
 189         pr_id(player, C_CMDOK, "\n");
 190     return RET_OK;
 191 }
 192
 193 static int
 194 coun_cmd(void)
 195 {
 196     natid cnum;
 197
 198     if (!player->argp[1])
 199         return RET_SYN;
 200     if (natbyname(player->argp[1], &cnum) < 0) {
 201         pr_id(player, C_CMDERR, "country %s does not exist\n", player->argp[1]);
 202         return RET_FAIL;
 203     }
 204     player->cnum = cnum;
 205     player->authenticated = 0;
 206     pr_id(player, C_CMDOK, "country name %s\n", player->argp[1]);
 207     return 0;
 208 }
 209
 210 static int
 211 pass_cmd(void)
 212 {
 213     if (!player->argp[1])
 214         return RET_SYN;
 215     if (player->cnum == NATID_BAD) {
 216         pr_id(player, C_CMDERR, "need country first\n");
 217         return RET_FAIL;
 218     }
 219     if (!natpass(player->cnum, player->argp[1])) {
 220         pr_id(player, C_CMDERR, "password bad, logging entry\n");
 221         logerror("%s tried country #%d with %s",
 222                  praddr(player), player->cnum, player->argp[1]);
 223         return RET_FAIL;
 224     }
 225     player->authenticated = 1;
 226     pr_id(player, C_CMDOK, "password ok\n");
 227     logerror("%s using country #%d", praddr(player), player->cnum);
 228     return RET_OK;
 229 }
 230
 231 static int
 232 options_cmd(void)
 233 {
 234     /*
 235      * The option mechanism allows arbitrary string values, but so far
 236      * all options are flags in struct player.  Should be easy to
 237      * generalize if needed.
 238      */
 239     struct logoptstr {
 240         char *name;
 241         int val;
 242     };
 243     static struct logoptstr login_opts[] = {
 244         { "utf-8", PF_UTF8 },
 245         { NULL, 0 }
 246     };
 247     char **ap;
 248     char *p;
 249     int opt;
 250     unsigned i;
 251
 252     if (!player->argp[1]) {
 253         for (i = 0; login_opts[i].name; ++i)
 254             pr_id(player, C_DATA, "%s=%d\n",
 255                   login_opts[i].name,
 256                   (player->flags & login_opts[i].val) != 0);
 257         pr_id(player, C_CMDOK, "\n");
 258         return RET_OK;
 259     }
 260
 261     for (ap = player->argp+1; *ap; ++ap) {
 262         p = strchr(*ap, '=');
 263         if (p)
 264             *p++ = 0;
 265         opt = stmtch(*ap, login_opts,
 266                      offsetof(struct logoptstr, name),
 267                      sizeof(struct logoptstr));
 268         if (opt < 0) {
 269             pr_id(player, C_BADCMD, "Option %s not found\n", *ap);
 270             return RET_FAIL;
 271         }
 272         if (!p || atoi(p))
 273             player->flags |= login_opts[opt].val;
 274         else
 275             player->flags &= ~login_opts[opt].val;
 276     }
 277
 278     pr_id(player, C_CMDOK, "Accepted\n");
 279
 280     return RET_OK;
 281 }
 282
 283 static int
 284 may_play(void)
 285 {
 286     struct natstr *np;
 287
 288     if (player->cnum == NATID_BAD || !player->authenticated) {
 289         pr_id(player, C_CMDERR, "need country and password\n");
 290         return 0;
 291     }
 292     /* TODO strstr() cheesy, compare IP against IP/BITS ... */
 293     np = getnatp(player->cnum);
 294     if (np->nat_stat == STAT_GOD && *privip
 295         && !strstr(privip, player->hostaddr)) {
 296         logerror("Deity login from untrusted host attempted by %s",
 297                  praddr(player));
 298         logerror("To allow this, add %s to econfig key privip",
 299                  player->hostaddr);
 300         pr_id(player, C_EXIT,
 301               "Deity login not allowed from this IP!"
 302               "  See log for help on how to allow it.\n");
 303         return 0;
 304     }
 305     return 1;
 306 }
 307
 308 static int
 309 play_cmd(void)
 310 {
 311     struct player *other;
 312     natid cnum;
 313     struct natstr *natp;
 314     char **ap;
 315     char buf[128];
 316
 317     ap = player->argp;
 318     if (*++ap) {
 319         strncpy(player->userid, *ap, sizeof(player->userid) - 1);
 320         player->userid[sizeof(player->userid) - 1] = '\0';
 321         player->authenticated = 0;
 322     }
 323     if (*++ap) {
 324         if (natbyname(*ap, &cnum) < 0) {
 325             pr_id(player, C_CMDERR, "country %s does not exist\n", *ap);
 326             return RET_FAIL;
 327         }
 328     }
 329     if (*++ap) {
 330         if (!natpass(cnum, *ap)) {
 331             pr_id(player, C_CMDERR, "password bad, logging entry\n");
 332             logerror("%s tried country #%d with %s",
 333                      praddr(player), cnum, *ap);
 334             return RET_FAIL;
 335         }
 336         player->cnum = cnum;
 337         player->authenticated = 1;
 338     }
 339     if (!may_play())
 340         return RET_FAIL;
 341     other = getplayer((natid)player->cnum);
 342     if (other) {
 343         natp = getnatp(player->cnum);
 344         if (natp->nat_stat != STAT_VIS) {
 345             pr_id(player, C_EXIT, "country in use by %s\n", praddr(other));
 346         } else {
 347             pr_id(player, C_EXIT, "country in use\n");
 348         }
 349         return RET_FAIL;
 350     }
 351     snprintf(buf, sizeof(buf), "Play#%d", player->cnum);
 352     empth_set_name(empth_self(), buf);
 353     logerror("%s logged in as country #%d", praddr(player), player->cnum);
 354     pr_id(player, C_INIT, "%d\n", CLIENTPROTO);
 355     player_main(player);
 356     logerror("%s logged out, country #%d", praddr(player), player->cnum);
 357     player->state = PS_SHUTDOWN;
 358     return RET_OK;
 359 }
 360
 361 static int
 362 kill_cmd(void)
 363 {
 364     struct player *other;
 365
 366     if (!may_play())
 367         return RET_FAIL;
 368     other = getplayer(player->cnum);
 369     if (!other) {
 370         pr_id(player, C_EXIT, "country not in use\n");
 371         return RET_FAIL;
 372     }
 373     logerror("%s killed country #%d", praddr(player), player->cnum);
 374     io_shutdown(other->iop, IO_READ | IO_WRITE);
 375     pr_id(player, C_EXIT, "closed socket of offending job\n");
 376     return RET_OK;
 377 }
 378
 379 static int
 380 quit_cmd(void)
 381 {
 382     pr_id(player, C_EXIT, "so long\n");
 383     io_shutdown(player->iop, IO_READ);
 384     return RET_OK;
 385 }