citadel/citmail.c

   1 /*
   2  * citmail.c v4.0
   3  *
   4  * This program may be used as a local mail delivery agent, which will allow
   5  * all Citadel users to receive Internet e-mail.  To enable this functionality,
   6  * you must tell sendmail, smail, or whatever mailer you are using, that this
   7  * program is your local mail delivery agent.  This program is a direct
   8  * replacement for lmail, deliver, or whatever.
   9  *
  10  * Usage:
  11  *
  12  * citmail <recipient>       - Deliver a message
  13  * citmail -t <recipient>    - Address test mode (will not deliver)
  14  * citmail -i                - Run as an SMTP daemon (typically from inetd)
  15  *
  16  */
  17
  18 #include "sysdep.h"
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <stdio.h>
  22 #include <fcntl.h>
  23 #include <ctype.h>
  24 #include <string.h>
  25 #include <time.h>
  26 #include <pwd.h>
  27 #include <errno.h>
  28 #include <syslog.h>
  29 #include "citadel.h"
  30
  31 #define LOCAL 0
  32 #define REMOTE 1
  33 #define UUCP 2
  34 #define CCITADEL 3
  35
  36 #undef tolower
  37 #define tolower(x) isupper(x) ? (x+'a'-'A') : x
  38
  39 char *monthdesc[] = {   "Jan","Feb","Mar","Apr","May","Jun",
  40                         "Jul","Aug","Sep","Oct","Nov","Dec" };
  41
  42
  43
  44 void LoadInternetConfig();
  45 void get_config();
  46 int IsHostLocal();
  47 struct config config;
  48
  49 char ALIASES[128];
  50 char CIT86NET[128];
  51 char SENDMAIL[128];
  52 char FALLBACK[128];
  53 char GW_DOMAIN[128];
  54 char TABLEFILE[128];
  55 char OUTGOING_FQDN[128];
  56 int RUN_NETPROC = 1;
  57
  58 int struncmp(lstr,rstr,l)
  59 char lstr[],rstr[]; {
  60         int pos = 0;
  61         char lc,rc;
  62         while (1) {
  63                 if (pos==l) return(0);
  64                 lc=tolower(lstr[pos]);
  65                 rc=tolower(rstr[pos]);
  66                 if ((lc==0)&&(rc==0)) return(0);
  67                 if (lc<rc) return(-1);
  68                 if (lc>rc) return(1);
  69                 pos=pos+1;
  70                 }
  71         }
  72
  73 long conv_date(sdbuf)
  74 char sdbuf[]; {
  75         int a,b,cpos,tend,tval;
  76         long now;
  77         struct tm *tmbuf;
  78         char dbuf[128];
  79
  80         strcpy(dbuf,sdbuf);
  81         time(&now);
  82         tmbuf = (struct tm *)localtime(&now);
  83
  84         /* get rid of + or - timezone mods */
  85         for (a=0; a<strlen(dbuf); ++a)
  86                 if ((dbuf[a]=='+')||(dbuf[a]=='-'))
  87                         do {
  88                                 strcpy(&dbuf[a],&dbuf[a+1]);
  89                                 } while ((dbuf[a]!=32)&&(dbuf[a]!=0));
  90
  91         /* try and extract the time by looking for colons */
  92         cpos = (-1);
  93         for (a=strlen(dbuf); a>=0; --a)
  94                 if ((dbuf[a]==':')&&(atoi(&dbuf[a-1])!=0)) cpos=a;
  95         if (cpos>=0) {
  96                 cpos = cpos - 2;
  97                 tend = strlen(dbuf);
  98                 for (a=tend; a>=cpos; --a) if (dbuf[a]==' ') tend=a;
  99
 100                 tmbuf->tm_hour = atoi(&dbuf[cpos]);
 101                 tmbuf->tm_min = atoi(&dbuf[cpos+3]);
 102                 tmbuf->tm_sec = atoi(&dbuf[cpos+6]);
 103
 104                 do {
 105                         strcpy(&dbuf[cpos],&dbuf[cpos+1]);
 106                         } while ((dbuf[cpos]!=32)&&(dbuf[cpos]!=0));
 107                 }
 108
 109         /* next try to extract a month */
 110
 111         tval = (-1);
 112         for (a=0; a<strlen(dbuf); ++a)
 113                 for (b=0; b<12; ++b)
 114                         if (!strncmp(&dbuf[a],monthdesc[b],3)) {
 115                                 tval = b;
 116                                 cpos = a;
 117                                 }
 118         if (tval >= 0) {
 119                 tmbuf->tm_mon = tval;
 120                 strcpy(&dbuf[cpos],&dbuf[cpos+3]);
 121                 }
 122
 123         /* now the year */
 124
 125         for (a=0; a<strlen(dbuf); ++a)
 126                 if ((atoi(&dbuf[a])>=1900) && (dbuf[a]!=32)) {
 127                         tmbuf->tm_year = atoi(&dbuf[a]) - 1900;
 128                         strcpy(&dbuf[a],&dbuf[a+4]);
 129                         }
 130
 131         /* whatever's left is the mday (hopefully) */
 132
 133         for (a=0; a<strlen(dbuf); ++a)
 134                 if ((dbuf[a]!=32)&&(atoi(&dbuf[a])>=1)&&(atoi(&dbuf[a])<=31)
 135                    && ( (a==0)||(dbuf[a-1]==' ') ) ) {
 136                         tmbuf->tm_mday = atoi(&dbuf[a]);
 137                         strcpy(&dbuf[a],&dbuf[a+2]);
 138                         }
 139
 140         return((long)mktime(tmbuf));
 141         }
 142
 143
 144 #ifdef NO_STRERROR
 145 /*
 146  * replacement strerror() for systems that don't have it
 147  */
 148 char *strerror(e)
 149 int e; {
 150         static char buf[32];
 151
 152         sprintf(buf,"errno = %d",e);
 153         return(buf);
 154         }
 155 #endif
 156
 157 int haschar(st,ch)
 158 char st[];
 159 int ch; {
 160         int a,b;
 161         b=0;
 162         for (a=0; a<strlen(st); ++a) if (st[a]==ch) ++b;
 163         return(b);
 164         }
 165
 166 void strip_trailing_whitespace(buf)
 167 char buf[]; {
 168         while(isspace(buf[strlen(buf)-1]))
 169                 buf[strlen(buf)-1]=0;
 170         }
 171
 172 /* strip leading and trailing spaces */
 173 void striplt(buf)
 174 char buf[]; {
 175         while ( (strlen(buf)>0) && (buf[0]==32) ) strcpy(buf,&buf[1]);
 176         while (buf[strlen(buf)-1] == 32) buf[strlen(buf)-1] = 0;
 177         }
 178
 179
 180 /*
 181  * Check to see if a given FQDN really maps to a Citadel network node
 182  */
 183 void host_alias(char host[]) {
 184
 185         int a;
 186
 187         /* What name is the local host known by? */
 188         /* if (!strucmp(host, config.c_fqdn)) { */
 189         if (IsHostLocal(host)) {
 190                 strcpy(host, config.c_nodename);
 191                 return;
 192                 }
 193
 194         /* Other hosts in the gateway domain? */
 195         for (a=0; a<strlen(host); ++a) {
 196                 if ((host[a]=='.') && (!strucmp(&host[a+1], GW_DOMAIN))) {
 197                         host[a] = 0;
 198                         for (a=0; a<strlen(host); ++a) {
 199                                 if (host[a]=='.') host[a] = 0;
 200                                 }
 201                         return;
 202                         }
 203                 }
 204
 205         /* Otherwise, do nothing... */
 206         }
 207
 208
 209
 210 /*
 211  * Split an RFC822-style address into userid, host, and full name
 212  */
 213 void process_rfc822_addr(rfc822,user,node,name)
 214 char rfc822[];
 215 char user[];
 216 char node[];
 217 char name[];  {
 218         int a;
 219
 220         /* extract full name - first, it's From minus <userid> */
 221         strcpy(name,rfc822);
 222         for (a=0; a<strlen(name); ++a) if (name[a]=='<') {
 223                 do {
 224                         strcpy(&name[a],&name[a+1]);
 225                         } while ( (strlen(name) > 0) && (name[a]!='>') );
 226                 strcpy(&name[a],&name[a+1]);
 227                 }
 228
 229         /* strip anything to the left of a bang */
 230         while ( (strlen(name)>0) && (haschar(name,'!')>0) )
 231                 strcpy(name,&name[1]);
 232
 233         /* and anything to the right of a @ or % */
 234         for (a=0; a<strlen(name); ++a) {
 235                 if (name[a]=='@') name[a]=0;
 236                 if (name[a]=='%') name[a]=0;
 237                 }
 238
 239         /* but if there are parentheses, that changes the rules... */
 240         if ( (haschar(rfc822,'(') == 1) && (haschar(rfc822,')') == 1) ) {
 241                 strcpy(name,rfc822);
 242                 while ( (strlen(name) > 0) && (name[0]!='(') ) {
 243                         strcpy(&name[0],&name[1]);
 244                         }
 245                 strcpy(&name[0],&name[1]);
 246                 for (a=0; a<strlen(name); ++a)
 247                          if (name[a]==')') name[a]=0;
 248                 }
 249
 250         /* but if there are a set of quotes, that supersedes everything */
 251         if (haschar(rfc822,34)==2) {
 252                 strcpy(name,rfc822);
 253                 while ( (strlen(name) > 0) && (name[0]!=34) ) {
 254                         strcpy(&name[0],&name[1]);
 255                         }
 256                 strcpy(&name[0],&name[1]);
 257                 for (a=0; a<strlen(name); ++a)
 258                         if (name[a]==34) name[a]=0;
 259                 }
 260
 261         /* extract user id */
 262         strcpy(user,rfc822);
 263
 264         /* first get rid of anything in parens */
 265         for (a=0; a<strlen(user); ++a) if (user[a]=='(') {
 266                 do {
 267                         strcpy(&user[a],&user[a+1]);
 268                         } while ( (strlen(user) > 0) && (user[a]!=')') );
 269                 strcpy(&user[a],&user[a+1]);
 270                 }
 271
 272         /* if there's a set of angle brackets, strip it down to that */
 273         if ( (haschar(user,'<') == 1) && (haschar(user,'>') == 1) ) {
 274                 while ( (strlen(user) > 0) && (user[0]!='<') ) {
 275                         strcpy(&user[0],&user[1]);
 276                         }
 277                 strcpy(&user[0],&user[1]);
 278                 for (a=0; a<strlen(user); ++a)
 279                          if (user[a]=='>') user[a]=0;
 280                 }
 281
 282         /* strip anything to the left of a bang */
 283         while ( (strlen(user)>0) && (haschar(user,'!')>0) )
 284                 strcpy(user,&user[1]);
 285
 286         /* and anything to the right of a @ or % */
 287         for (a=0; a<strlen(user); ++a) {
 288                 if (user[a]=='@') user[a]=0;
 289                 if (user[a]=='%') user[a]=0;
 290                 }
 291
 292
 293
 294         /* extract node name */
 295         strcpy(node, rfc822);
 296
 297         /* first get rid of anything in parens */
 298         for (a=0; a<strlen(node); ++a) if (node[a]=='(') {
 299                 do {
 300                         strcpy(&node[a],&node[a+1]);
 301                         } while ( (strlen(node) > 0) && (node[a]!=')') );
 302                 strcpy(&node[a],&node[a+1]);
 303                 }
 304
 305         /* if there's a set of angle brackets, strip it down to that */
 306         if ( (haschar(node,'<') == 1) && (haschar(node,'>') == 1) ) {
 307                 while ( (strlen(node) > 0) && (node[0]!='<') ) {
 308                         strcpy(&node[0],&node[1]);
 309                         }
 310                 strcpy(&node[0],&node[1]);
 311                 for (a=0; a<strlen(node); ++a)
 312                          if (node[a]=='>') node[a]=0;
 313                 }
 314
 315         /* strip anything to the left of a @ */
 316         while ( (strlen(node)>0) && (haschar(node,'@')>0) )
 317                 strcpy(node,&node[1]);
 318
 319         /* strip anything to the left of a % */
 320         while ( (strlen(node)>0) && (haschar(node,'%')>0) )
 321                 strcpy(node,&node[1]);
 322
 323         /* reduce multiple system bang paths to node!user */
 324         while ( (strlen(node)>0) && (haschar(node,'!')>1) )
 325                 strcpy(node,&node[1]);
 326
 327         /* now get rid of the user portion of a node!user string */
 328         for (a=0; a<strlen(node); ++a) if (node[a]=='!') node[a]=0;
 329
 330
 331
 332         /* strip leading and trailing spaces in all strings */
 333         striplt(user);
 334         striplt(node);
 335         striplt(name);
 336         }
 337
 338 /*
 339  * Copy line by line, ending at EOF or a "."
 340  */
 341 void loopcopy(FILE *to, FILE *from) {
 342         char buf[1024];
 343         char *r;
 344
 345         while (1) {
 346                 r = fgets(buf, sizeof(buf), from);
 347                 if (r == NULL) return;
 348                 strip_trailing_whitespace(buf);
 349                 if (!strcmp(buf, ".")) return;
 350                 fprintf(to, "%s\n", buf);
 351                 }
 352         }
 353
 354
 355 /*
 356  * pipe message through netproc
 357  */
 358 void do_citmail(char recp[], int dtype) {
 359
 360         long now;
 361         FILE *temp;
 362         int a;
 363         char buf[128];
 364         char from[512];
 365         char userbuf[256];
 366         char frombuf[256];
 367         char nodebuf[256];
 368         char destsys[256];
 369         char subject[256];
 370
 371
 372         if (dtype==REMOTE) {
 373
 374                 /* get the Citadel node name out of the path */
 375                 strncpy(destsys, recp, sizeof(destsys) );
 376                 for (a=0; a<strlen(destsys); ++a) {
 377                         if ((destsys[a]=='!')||(destsys[a]=='.')) {
 378                                 destsys[a]=0;
 379                                 }
 380                         }
 381
 382                 /* chop the system name out, so we're left with a user */
 383                 while (haschar(recp,'!')) strcpy(recp,&recp[1]);
 384
 385                 /* now convert underscores to spaces */
 386                 for (a=0; a<strlen(recp); ++a) if (recp[a]=='_') recp[a]=' ';
 387
 388                 }
 389
 390         time(&now);
 391         sprintf(from, "postmaster@%s", config.c_nodename);
 392
 393         sprintf(buf, "./network/spoolin/citmail.%d", getpid());
 394         temp = fopen(buf,"w");
 395
 396         putc(255,temp); putc(MES_NORMAL,temp); putc(1,temp);
 397         strcpy(subject,"");
 398         strcpy(nodebuf, config.c_nodename);
 399         do {
 400                 if (fgets(buf,128,stdin) == NULL) strcpy(buf, ".");
 401                 strip_trailing_whitespace(buf);
 402
 403                 if (!strncmp(buf,"Subject: ",9)) strcpy(subject,&buf[9]);
 404                 if (!strncmp(buf,"Date: ",6)) now = conv_date(&buf[6]);
 405                 if (!strncmp(buf,"From: ",6)) strcpy(from, &buf[6]);
 406                 } while ( (strcmp(buf, ".")) && (strcmp(buf, "")) );
 407
 408         process_rfc822_addr(from, userbuf, nodebuf, frombuf);
 409
 410         /* now convert it to Citadel format */
 411         fprintf(temp,"P%s@%s%c", userbuf, nodebuf, 0);
 412         fprintf(temp,"E%s%c", userbuf, 0);
 413         fprintf(temp,"T%ld%c", now, 0);
 414         fprintf(temp,"A%s%c", frombuf, 0);
 415         fprintf(temp,"OMail%c", 0);
 416         fprintf(temp,"N%s%c", nodebuf, 0);
 417         if (dtype==REMOTE) {
 418                 fprintf(temp,"D%s%c", destsys, 0);
 419                 }
 420         fprintf(temp,"R%s%c", recp, 0);
 421         if (strlen(subject)>0) {
 422                 fprintf(temp,"U%s%c", subject, 0);
 423                 }
 424         putc('M',temp);
 425         if (strcmp(buf, ".")) loopcopy(temp, stdin);
 426         putc(0,temp);
 427         fclose(temp);
 428         }
 429
 430 void do_roommail(recp)  /* pipe public message through netproc */
 431 char recp[]; {
 432         long now;
 433         FILE *temp;
 434         int a;
 435         char buf[128],userbuf[128],frombuf[128],nodebuf[128];
 436         char subject[128], from[256];
 437
 438         strcpy(subject,"");
 439         sprintf(from, "postmaster@%s", config.c_nodename);
 440         strcpy(recp,&recp[5]);
 441         for (a=0; a<strlen(recp); ++a) if (recp[a]=='_') recp[a]=32;
 442         time(&now);
 443
 444
 445         sprintf(buf,"./network/spoolin/citmail.%d",getpid());
 446         temp = fopen(buf,"w");
 447
 448         putc(255,temp); putc(MES_NORMAL,temp); putc(1,temp);
 449         strcpy(frombuf,"Internet Mail Gateway");
 450         strcpy(nodebuf, config.c_nodename);
 451         do {
 452                 if (fgets(buf,128,stdin) == NULL) strcpy(buf, ".");
 453                 strip_trailing_whitespace(buf);
 454
 455                 if (!strncmp(buf,"Subject: ",9)) strcpy(subject,&buf[9]);
 456                 if (!strncmp(buf,"Date: ",6)) now = conv_date(&buf[6]);
 457                 if (!strncmp(buf,"From: ",6)) strcpy(from, &buf[6]);
 458                 } while ( (strcmp(buf, ".")) && (strcmp(buf, "")) );
 459
 460         process_rfc822_addr(from, userbuf, nodebuf, frombuf);
 461
 462         fprintf(temp,"P%s@%s",userbuf,nodebuf); putc(0,temp);
 463         fprintf(temp,"T%ld",now); putc(0,temp);
 464         fprintf(temp,"A%s",frombuf); putc(0,temp);
 465         fprintf(temp,"O%s",recp); putc(0,temp);
 466         fprintf(temp,"N%s",nodebuf); putc(0,temp);
 467         if (strlen(subject)>0) {
 468                 fprintf(temp,"U%s",subject); putc(0,temp);
 469                 }
 470         putc('M',temp);
 471         if (strcmp(buf, ".")) loopcopy(temp, stdin);
 472         putc(0,temp);
 473         fclose(temp);
 474         }
 475
 476 void do_uudecode(target)
 477 char *target;  {
 478         static char buf[1024];
 479         FILE *fp;
 480
 481         sprintf(buf,"cd %s; uudecode",target);
 482
 483         fp=popen(buf,"w");
 484         if (fp==NULL) return;
 485         while (fgets(buf,1024,stdin)!=NULL) {
 486                 fprintf(fp,"%s",buf);
 487                 }
 488         pclose(fp);
 489
 490         }
 491
 492 void do_fallback(recp)
 493 char recp[]; {
 494         static char buf[1024];
 495         FILE *fp;
 496
 497         sprintf(buf, FALLBACK, recp);
 498         fp=popen(buf,"w");
 499         if (fp==NULL) fp = popen("cat >/dev/null", "w");
 500         loopcopy(fp, stdin);
 501         pclose(fp);
 502         }
 503
 504 int alias(name)
 505 char *name; {
 506         FILE *fp;
 507         int a;
 508         char abuf[256];
 509
 510         fp=fopen(ALIASES,"r");
 511         if (fp==NULL) {
 512                 syslog(LOG_ERR,"cannot open %s: %s",ALIASES,strerror(errno));
 513                 return(2);
 514                 }
 515
 516         while (fgets(abuf,256,fp)!=NULL) {
 517                 strip_trailing_whitespace(abuf);
 518                 for (a=0; a<strlen(abuf); ++a) {
 519                         if (abuf[a]==',') {
 520                                 abuf[a]=0;
 521                                 if (!strucmp(name,abuf)) {
 522                                         strcpy(name,&abuf[a+1]);
 523                                         }
 524                                 }
 525                         }
 526                 }
 527         fclose(fp);
 528         return(0);
 529         }
 530
 531
 532 void deliver(char recp[], int is_test, int deliver_to_ignet) {
 533
 534         /* various ways we can deliver mail... */
 535
 536         if (deliver_to_ignet) {
 537                 syslog(LOG_NOTICE,"to Citadel network user %s",recp);
 538                 if (is_test == 0) do_citmail(recp, REMOTE);
 539                 }
 540
 541         else if (!strcmp(recp,"uudecode")) {
 542                 syslog(LOG_NOTICE,"uudecoding to bit bucket directory");
 543                 if (is_test == 0) do_uudecode(config.c_bucket_dir);
 544                 }
 545
 546         else if (!strcmp(recp,"cit86net")) {
 547                 syslog(LOG_NOTICE,"uudecoding to Cit86net spool");
 548                 if (is_test == 0) {
 549                         do_uudecode(CIT86NET);
 550                         system("exec ./BatchTranslate86");
 551                         }
 552                 }
 553
 554         else if (!strcmp(recp,"null")) {
 555                 syslog(LOG_NOTICE,"zapping nulled message");
 556                 }
 557
 558         else if (!struncmp(recp,"room_",5)) {
 559                 syslog(LOG_NOTICE,"to room %s",recp);
 560                 if (is_test == 0) do_roommail(recp);
 561                 }
 562
 563         else {
 564                 /* Otherwise, we treat the recipient as the name of a local
 565                  * Citadel user.  If the username doesn't exist, we still
 566                  * deliver it to Citadel -- netproc will handle the bounce.
 567                  */
 568                 syslog(LOG_NOTICE,"to Citadel user %s",recp);
 569                 if (is_test == 0) do_citmail(recp, LOCAL);
 570                 }
 571
 572         }
 573
 574
 575
 576 void main(argc,argv)
 577 int argc;
 578 char *argv[]; {
 579         int is_test = 0;
 580         int deliver_to_ignet = 0;
 581         int smtp = 0;
 582         static char recp[1024], buf[1024];
 583         static char user[1024], node[1024], name[1024];
 584         int a;
 585
 586         openlog("citmail", LOG_PID, LOG_USER);
 587         get_config();
 588         LoadInternetConfig();
 589
 590         if (!strcmp(argv[1],"-t")) {
 591                 is_test = 1;
 592                 syslog(LOG_NOTICE,"test mode - will not deliver");
 593                 }
 594         if (!strcmp(argv[1], "-i")) {
 595                 smtp = 1;
 596                 syslog(LOG_NOTICE,"started as an SMTP daemon");
 597                 }
 598
 599
 600         if (smtp) {
 601                 strcpy(recp, "");
 602                 }
 603         else if (is_test == 0) {
 604                 strcpy(recp,argv[1]);
 605                 }
 606         else {
 607                 strcpy(recp,argv[2]);
 608                 }
 609
 610
 611         if (smtp) {
 612                 /*** SMTP delivery mode ***/
 613
 614                 printf("200 Citadel/UX SMTP gateway ready.\n");
 615
 616                 do {
 617                         fflush(stdout);
 618                         fflush(stderr);
 619                         fgets(buf, 1024, stdin);
 620                         while ( (strlen(buf)>0) && (buf[strlen(buf)-1]>0) && (buf[strlen(buf)-1]<32) ) {
 621                                 buf[strlen(buf)-1] = 0;
 622                                 }
 623
 624                         /* null-pad to allow some lazy compares */
 625                         buf[strlen(buf)+1] = 0;
 626                         buf[strlen(buf)+2] = 0;
 627                         buf[strlen(buf)+3] = 0;
 628
 629                         if (!struncmp(buf, "QUIT", 4)) {
 630                                 printf("221 Later, dude.\n");
 631                                 }
 632                         else if (!struncmp(buf, "HELP", 4)) {
 633                                 printf("214 You think _you_ need help?\n");
 634                                 }
 635                         else if (!struncmp(buf, "HELO", 4)) {
 636                                 printf("250 Howdy ho, Mr. Hankey!\n");
 637                                 }
 638                         else if (!struncmp(buf, "MAIL", 4)) {
 639                                 printf("250 Sure, whatever...\n");
 640                                 }
 641
 642
 643                         else if (!struncmp(buf, "RCPT To: ", 9)) {
 644                                 if (strlen(recp) > 0) {
 645                                         printf("571 Multiple recipients not supported.\n");
 646                                         }
 647                                 else {
 648                                         strcpy(recp, &buf[9]);
 649                                         if (haschar(recp, ',')) {
 650                                                 printf("571 Multiple recipients not supported.\n");
 651                                                 strcpy(recp, "");
 652                                                 }
 653                                         else {
 654                                                 syslog(LOG_NOTICE,"recp: %s",recp);
 655                                                 for (a=0; a<2; ++a) {
 656                                                         alias(recp);
 657                                                         }
 658
 659                                                 /* did we alias it back to a remote address? */
 660                                                 if (    (haschar(recp,'%'))
 661                                                 ||      (haschar(recp,'@'))
 662                                                 ||      (haschar(recp,'!')) ) {
 663
 664                                                         process_rfc822_addr(recp, user, node, name);
 665                                                         host_alias(node);
 666
 667                                                         /* If there are dots, it's an Internet host, so feed it
 668                                                         * back to an external mail transport agent such as sendmail.
 669                                                         */
 670                                                         if (haschar(node, '.')) {
 671                                                                 printf("571 Away with thee, spammer!\n");
 672                                                                 strcpy(recp, "");
 673                                                                 }
 674
 675                                                         /* Otherwise, we're dealing with Citadel mail. */
 676                                                         else {
 677                                                                 sprintf(recp, "%s!%s", node, user);
 678                                                                 deliver_to_ignet = 1;
 679                                                                 printf("250 IGnet recipient.\n");
 680                                                                 }
 681                                                         }
 682                                                 else {
 683                                                         printf("250 Local recipient.\n");
 684                                                         }
 685
 686                                                 }
 687
 688                                         }
 689                                 }
 690
 691
 692
 693                         else if (!struncmp(buf, "RCPT", 4)) {
 694                                 printf("501 Only 'To:' commands are supported.\n");
 695                                 }
 696                         else if (!struncmp(buf, "DATA", 4)) {
 697                                 if (strlen(recp) > 0) {
 698                                         printf("354 Sock it to me, baby...\n");
 699                                         fflush(stdout);
 700                                         deliver(recp, is_test, deliver_to_ignet);
 701                                         printf("250 Cool beans!\n");
 702                                         }
 703                                 else {
 704                                         printf("503 No recipient has been specified.\n");
 705                                         }
 706                                 }
 707                         else {
 708                                 printf("500 Huh?\n");
 709                                 }
 710
 711                         } while (struncmp(buf,"QUIT",4));
 712                 }
 713
 714         else {
 715                 /*** Non-SMTP delivery mode ***/
 716                 syslog(LOG_NOTICE,"recp: %s",recp);
 717                 for (a=0; a<2; ++a) {
 718                         alias(recp);
 719                         }
 720
 721                 /* did we alias it back to a remote address? */
 722                 if (    (haschar(recp,'%'))
 723                 ||      (haschar(recp,'@'))
 724                 ||      (haschar(recp,'!')) ) {
 725
 726                         process_rfc822_addr(recp, user, node, name);
 727                         host_alias(node);
 728
 729                         /* If there are dots, it's an Internet host, so feed it
 730                         * back to an external mail transport agent such as sendmail.
 731                         */
 732                         if (haschar(node, '.')) {
 733                                 sprintf(buf, SENDMAIL, recp);
 734                                 system(buf);
 735                                 exit(0);
 736                                 }
 737
 738                         /* Otherwise, we're dealing with Citadel mail. */
 739                         else {
 740                                 sprintf(recp, "%s!%s", node, user);
 741                                 deliver_to_ignet = 1;
 742                                 }
 743
 744                         }
 745
 746                 deliver(recp, is_test, deliver_to_ignet);
 747                 }
 748
 749         closelog();
 750         if (RUN_NETPROC) execlp("./netproc","netproc",NULL);
 751         exit(0);
 752         }
 753