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, 2004-2011
  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     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     for (;;) {
  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         journal_input(buf);
 101         ac = parse(buf, space, player->argp, NULL, NULL, NULL);
 102         if (ac <= 0) {
 103             pr_id(player, C_BADCMD, "Can't parse command\n");
 104             continue;
 105         }
 106         cmd = comtch(player->argp[0], login_coms, 0);
 107         if (cmd < 0) {
 108             pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 109             continue;
 110         }
 111         switch (login_coms[cmd].c_addr()) {
 112         case RET_OK:
 113             break;
 114         case RET_FAIL:
 115             break;
 116         case RET_SYN:
 117             pr_id(player, C_BADCMD, "Usage %s\n", login_coms[cmd].c_form);
 118             break;
 119         default:
 120             break;
 121         }
 122     }
 123     player->state = PS_SHUTDOWN;
 124     pr_id(player, C_EXIT, "so long...\n");
 125     while (io_output(player->iop, 1) > 0) ;
 126     player_delete(player);
 127     empth_exit();
 128     /*NOTREACHED*/
 129 }
 130
 131 static int
 132 client_cmd(void)
 133 {
 134     int i, sz;
 135     char *p, *end;
 136
 137     if (!player->argp[1])
 138         return RET_SYN;
 139
 140     p = player->client;
 141     end = player->client + sizeof(player->client) - 1;
 142     for (i = 1; player->argp[i]; ++i) {
 143         if (i > 1)
 144             *p++ = ' ';
 145         sz = strlen(player->argp[i]);
 146         sz = MIN(sz, end - p);
 147         memcpy(p, player->argp[i], sz);
 148         p += sz;
 149     }
 150     *p = 0;
 151     pr_id(player, C_CMDOK, "talking to %s\n", player->client);
 152     return RET_OK;
 153 }
 154
 155 static int
 156 user_cmd(void)
 157 {
 158     if (!player->argp[1])
 159         return RET_SYN;
 160     strncpy(player->userid, player->argp[1], sizeof(player->userid) - 1);
 161     player->userid[sizeof(player->userid) - 1] = '\0';
 162     pr_id(player, C_CMDOK, "hello %s\n", player->userid);
 163     return RET_OK;
 164 }
 165
 166 static int
 167 sanc_cmd(void)
 168 {
 169     struct nstr_item ni;
 170     struct natstr nat;
 171     int first = 1;
 172
 173     if (!opt_BLITZ) {
 174         pr_id(player, C_BADCMD, "Command %s not found\n", player->argp[0]);
 175         return RET_FAIL;
 176     }
 177
 178     snxtitem_all(&ni, EF_NATION);
 179     while (nxtitem(&ni, &nat)) {
 180         if (nat.nat_stat != STAT_SANCT)
 181             continue;
 182         if (first) {
 183             pr_id(player, C_DATA,
 184                   "The following countries are still in sanctuary:\n");
 185             first = 0;
 186         }
 187         pr_id(player, C_DATA, "%s\n", nat.nat_cnam);
 188     }
 189     if (first)
 190         pr_id(player, C_CMDOK, "There are no countries in sanctuary\n");
 191     else
 192         pr_id(player, C_CMDOK, "\n");
 193     return RET_OK;
 194 }
 195
 196 static int
 197 coun_cmd(void)
 198 {
 199     natid cnum;
 200
 201     if (!player->argp[1])
 202         return RET_SYN;
 203     if (natbyname(player->argp[1], &cnum) < 0) {
 204         pr_id(player, C_CMDERR, "country %s does not exist\n", player->argp[1]);
 205         return RET_FAIL;
 206     }
 207     player->cnum = cnum;
 208     player->authenticated = 0;
 209     pr_id(player, C_CMDOK, "country name %s\n", player->argp[1]);
 210     return 0;
 211 }
 212
 213 static int
 214 pass_cmd(void)
 215 {
 216     if (!player->argp[1])
 217         return RET_SYN;
 218     if (player->cnum == NATID_BAD) {
 219         pr_id(player, C_CMDERR, "need country first\n");
 220         return RET_FAIL;
 221     }
 222     if (!natpass(player->cnum, player->argp[1])) {
 223         pr_id(player, C_CMDERR, "password bad, logging entry\n");
 224         logerror("%s tried country #%d with %s",
 225                  praddr(player), player->cnum, player->argp[1]);
 226         return RET_FAIL;
 227     }
 228     player->authenticated = 1;
 229     pr_id(player, C_CMDOK, "password ok\n");
 230     logerror("%s using country #%d", praddr(player), player->cnum);
 231     return RET_OK;
 232 }
 233
 234 static int
 235 options_cmd(void)
 236 {
 237     /*
 238      * The option mechanism allows arbitrary string values, but so far
 239      * all options are flags in struct player.  Should be easy to
 240      * generalize if needed.
 241      */
 242     struct logoptstr {
 243         char *name;
 244         int val;
 245     };
 246     static struct logoptstr login_opts[] = {
 247         { "utf-8", PF_UTF8 },
 248         { NULL, 0 }
 249     };
 250     char **ap;
 251     char *p;
 252     int opt;
 253     unsigned i;
 254
 255     if (!player->argp[1]) {
 256         for (i = 0; login_opts[i].name; ++i)
 257             pr_id(player, C_DATA, "%s=%d\n",
 258                   login_opts[i].name,
 259                   (player->flags & login_opts[i].val) != 0);
 260         pr_id(player, C_CMDOK, "\n");
 261         return RET_OK;
 262     }
 263
 264     for (ap = player->argp+1; *ap; ++ap) {
 265         p = strchr(*ap, '=');
 266         if (p)
 267             *p++ = 0;
 268         opt = stmtch(*ap, login_opts,
 269                      offsetof(struct logoptstr, name),
 270                      sizeof(struct logoptstr));
 271         if (opt < 0) {
 272             pr_id(player, C_BADCMD, "Option %s not found\n", *ap);
 273             return RET_FAIL;
 274         }
 275         if (!p || atoi(p))
 276             player->flags |= login_opts[opt].val;
 277         else
 278             player->flags &= ~login_opts[opt].val;
 279     }
 280
 281     pr_id(player, C_CMDOK, "Accepted\n");
 282
 283     return RET_OK;
 284 }
 285
 286 static int
 287 may_play(void)
 288 {
 289     struct natstr *np;
 290
 291     if (player->cnum == NATID_BAD || !player->authenticated) {
 292         pr_id(player, C_CMDERR, "need country and password\n");
 293         return 0;
 294     }
 295     /* TODO strstr() cheesy, compare IP against IP/BITS ... */
 296     np = getnatp(player->cnum);
 297     if (np->nat_stat == STAT_GOD && *privip
 298         && !strstr(privip, player->hostaddr)) {
 299         logerror("Deity login from untrusted host attempted by %s",
 300                  praddr(player));
 301         logerror("To allow this, add %s to econfig key privip",
 302                  player->hostaddr);
 303         pr_id(player, C_EXIT,
 304               "Deity login not allowed from this IP!"
 305               "  See log for help on how to allow it.\n");
 306         return 0;
 307     }
 308     return 1;
 309 }
 310
 311 static int
 312 play_cmd(void)
 313 {
 314     struct player *other;
 315     natid cnum;
 316     struct natstr *natp;
 317     char **ap;
 318     char buf[128];
 319
 320     ap = player->argp;
 321     if (*++ap) {
 322         strncpy(player->userid, *ap, sizeof(player->userid) - 1);
 323         player->userid[sizeof(player->userid) - 1] = '\0';
 324         player->authenticated = 0;
 325     }
 326     if (*++ap) {
 327         if (natbyname(*ap, &cnum) < 0) {
 328             pr_id(player, C_CMDERR, "country %s does not exist\n", *ap);
 329             return RET_FAIL;
 330         }
 331     }
 332     if (*++ap) {
 333         if (!natpass(cnum, *ap)) {
 334             pr_id(player, C_CMDERR, "password bad, logging entry\n");
 335             logerror("%s tried country #%d with %s",
 336                      praddr(player), cnum, *ap);
 337             return RET_FAIL;
 338         }
 339         player->cnum = cnum;
 340         player->authenticated = 1;
 341     }
 342     if (!may_play())
 343         return RET_FAIL;
 344     other = getplayer(player->cnum);
 345     if (other) {
 346         natp = getnatp(player->cnum);
 347         if (natp->nat_stat != STAT_VIS) {
 348             pr_id(player, C_EXIT, "country in use by %s\n", praddr(other));
 349         } else {
 350             pr_id(player, C_EXIT, "country in use\n");
 351         }
 352         return RET_FAIL;
 353     }
 354     snprintf(buf, sizeof(buf), "Play#%d", player->cnum);
 355     empth_set_name(empth_self(), buf);
 356     logerror("%s logged in as country #%d", praddr(player), player->cnum);
 357     pr_id(player, C_INIT, "%d\n", CLIENTPROTO);
 358     player->state = PS_PLAYING;
 359     player_main(player);
 360     logerror("%s logged out, country #%d", praddr(player), player->cnum);
 361     if (CANT_HAPPEN(!io_eof(player->iop)))
 362         io_set_eof(player->iop);
 363     return RET_OK;
 364 }
 365
 366 static int
 367 kill_cmd(void)
 368 {
 369     struct player *other;
 370
 371     if (!may_play())
 372         return RET_FAIL;
 373     other = getplayer(player->cnum);
 374     if (!other) {
 375         pr_id(player, C_EXIT, "country not in use\n");
 376         return RET_FAIL;
 377     }
 378     logerror("%s killed country #%d", praddr(player), player->cnum);
 379     io_shutdown(other->iop, IO_READ | IO_WRITE);
 380     pr_id(player, C_EXIT, "closed socket of offending job\n");
 381     return RET_OK;
 382 }
 383
 384 static int
 385 quit_cmd(void)
 386 {
 387     io_set_eof(player->iop);
 388     return RET_OK;
 389 }