citadel/netproc.c

   1 /*
   2  * Citadel/UX Intelligent Network Processor for IGnet/Open networks v3.6
   3  * Designed and written by Art Cancro @ Uncensored Communications Group
   4  * See copyright.txt for copyright information
   5  */
   6
   7 /*
   8  * Specify where netproc should log to, and the mode for opening the file.
   9  * If you are logging to a file, NPLOGMODE should be a; if you are logging to
  10  * a device or fifo it should be w.
  11  */
  12 #define NPLOGFILE       "./netproc.log"
  13 #define NPLOGMODE       "a"
  14
  15 /* How long it takes for an old node to drop off the network map */
  16 #define EXPIRY_TIME     (2592000L)
  17
  18 /* Where do we keep our lock file? */
  19 #define LOCKFILE        "/var/lock/LCK.netproc"
  20
  21 /* Path to the 'uudecode' utility (needed for network file transfers) */
  22 #define UUDECODE        "/usr/bin/uudecode"
  23
  24 /* Uncomment the DEBUG def to see noisy traces */
  25 /* #define DEBUG 1 */
  26
  27
  28 #include "sysdep.h"
  29 #include <stdlib.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33 #include <string.h>
  34 #include <fcntl.h>
  35 #include <stdio.h>
  36 #include <ctype.h>
  37 #include <time.h>
  38 #include <signal.h>
  39 #include <errno.h>
  40 #include "citadel.h"
  41
  42 /* A list of users you wish to filter out of incoming traffic can be kept
  43  * in ./network/filterlist -- messages from these users will be automatically
  44  * moved to FILTERROOM.  Normally this will be the same as TWITROOM (the
  45  * room problem user messages are moved to) but you can override this by
  46  * specifying a different room name here.
  47  */
  48 #ifndef FILTERROOM
  49 #define FILTERROOM TWITROOM
  50 #endif
  51
  52 struct msglist {
  53         struct msglist *next;
  54         long m_num;
  55         char m_rmname[20];
  56         };
  57
  58 struct rmlist {
  59         struct rmlist *next;
  60         char rm_name[20];
  61         long rm_lastsent;
  62         };
  63
  64 struct filterlist {
  65         struct filterlist *next;
  66         char f_person[64];
  67         char f_room[64];
  68         char f_system[64];
  69         };
  70
  71 struct syslist {
  72         struct syslist *next;
  73         char s_name[16];
  74         char s_type[4];
  75         char s_nexthop[128];
  76         long s_lastcontact;
  77         char s_humannode[64];
  78         char s_phonenum[32];
  79         char s_gdom[64];
  80         };
  81
  82 struct minfo {
  83         char A[512];
  84         char E[512];
  85         long I;
  86         char N[512];
  87         char O[512];
  88         char R[512];
  89         long T;
  90         char D[512];
  91         char C[512];
  92         char nexthop[32];
  93         char H[512];
  94         char S[512];
  95         char B[512];
  96         char G[512];
  97         };
  98
  99
 100 void attach_to_server(int argc, char **argv);
 101 void serv_read(char *buf, int bytes);
 102 void serv_write(char *buf, int nbytes);
 103 void get_config(void);
 104
 105 struct filterlist *filter = NULL;
 106 char roomnames[MAXROOMS][20];
 107 char roomdirs[MAXROOMS][15];
 108 struct syslist *slist = NULL;
 109
 110 struct config config;
 111 extern char bbs_home_directory[];
 112 extern int home_specified;
 113
 114
 115 #ifndef HAVE_STRERROR
 116 /*
 117  * replacement strerror() for systems that don't have it
 118  */
 119 char *strerror(int e)
 120 {
 121         static char buf[32];
 122
 123         sprintf(buf,"errno = %d",e);
 124         return(buf);
 125         }
 126 #endif
 127
 128
 129 void strip_trailing_whitespace(char *buf)
 130 {
 131         while(isspace(buf[strlen(buf)-1]))
 132                 buf[strlen(buf)-1]=0;
 133         }
 134
 135
 136 /*
 137  * for performance optimization, netproc loads the list of room names (and
 138  * their corresponding directory names, if applicable) into a table in memory.
 139  */
 140 int load_roomnames(void) {
 141         FILE *fp;
 142         struct quickroom qbuf;
 143         int i;
 144
 145         fp=fopen("./quickroom","rb");
 146         if (fp==NULL) return(1);
 147         for (i=0; i<MAXROOMS; ++i) {
 148                 if (fread((char *)&qbuf,sizeof(struct quickroom),1,fp)!=1)
 149                         return(1);
 150                 strcpy(roomnames[i],qbuf.QRname);
 151                 if (qbuf.QRflags & QR_DIRECTORY)
 152                         strcpy(roomdirs[i],qbuf.QRdirname);
 153                 else
 154                         strcpy(roomdirs[i],config.c_bucket_dir);
 155                 }
 156         fclose(fp);
 157         return(0);
 158         }
 159
 160 /*
 161  * we also load the network/mail.sysinfo table into memory, make changes
 162  * as we learn more about the network from incoming messages, and write
 163  * the table back to disk when we're done.
 164  */
 165 int load_syslist(void) {
 166         FILE *fp;
 167         struct syslist *stemp;
 168         char insys = 0;
 169         char buf[128];
 170
 171         fp=fopen("network/mail.sysinfo","rb");
 172         if (fp==NULL) return(1);
 173
 174         while(1) {
 175                 if (fgets(buf,128,fp)==NULL) {
 176                         fclose(fp);
 177                         return(0);
 178                         }
 179                 buf[strlen(buf)-1] = 0;
 180                 while (isspace(buf[0])) strcpy(buf,&buf[1]);
 181                 if (buf[0]=='#') buf[0]=0;
 182                 if ( (insys==0) && (strlen(buf)!=0) ) {
 183                         insys = 1;
 184                         stemp =(struct syslist *)malloc(sizeof(struct syslist));
 185                         stemp->next = slist;
 186                         slist = stemp;
 187                         strcpy(slist->s_name,buf);
 188                         strcpy(slist->s_type,"bin");
 189                         strcpy(slist->s_nexthop,"Mail");
 190                         slist->s_lastcontact = 0L;
 191                         strcpy(slist->s_humannode,"");
 192                         strcpy(slist->s_phonenum,"");
 193                         strcpy(slist->s_gdom,"");
 194                         }
 195                 else if ( (insys==1) && (strlen(buf)==0) ) {
 196                         insys = 0;
 197                         }
 198                 else if ( (insys==1) && (!strncmp(buf,"bin",3)) ) {
 199                         strcpy(slist->s_type,"bin");
 200                         strcpy(slist->s_nexthop,&buf[4]);
 201                         }
 202                 else if ( (insys==1) && (!strncmp(buf,"use",3)) ) {
 203                         strcpy(slist->s_type,"use");
 204                         strcpy(slist->s_nexthop,&buf[4]);
 205                         }
 206                 else if ( (insys==1) && (!strncmp(buf,"uum",3)) ) {
 207                         strcpy(slist->s_type,"uum");
 208                         strcpy(slist->s_nexthop,&buf[4]);
 209                         }
 210                 else if ( (insys==1) && (!strncmp(buf,"lastcontact",11)) ) {
 211                         sscanf(&buf[12],"%ld",&slist->s_lastcontact);
 212                         }
 213                 else if ( (insys==1) && (!strncmp(buf,"humannode",9)) ) {
 214                         strcpy(slist->s_humannode,&buf[10]);
 215                         }
 216                 else if ( (insys==1) && (!strncmp(buf,"phonenum",8)) ) {
 217                         strcpy(slist->s_phonenum,&buf[9]);
 218                         }
 219                 else if ( (insys==1) && (!strncmp(buf,"gdom",4)) ) {
 220                         strcpy(slist->s_gdom,&buf[5]);
 221                         }
 222                 }
 223         }
 224
 225 /* now we have to set up two "special" nodes on the list: one
 226  * for the local node, and one for an Internet gateway
 227  */
 228 void setup_special_nodes(void) {
 229         struct syslist *stemp,*slocal;
 230
 231         slocal = NULL;
 232         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 233                 if (!strcasecmp(stemp->s_name,config.c_nodename)) slocal=stemp;
 234                 }
 235         if (slocal==NULL) {
 236                 slocal =(struct syslist *)malloc(sizeof(struct syslist));
 237                 slocal->next = slist;
 238                 slist = slocal;
 239                 }
 240         strcpy(slocal->s_name,config.c_nodename);
 241         strcpy(slocal->s_type,"bin");
 242         strcpy(slocal->s_nexthop,"Mail");
 243         time(&slocal->s_lastcontact);
 244         strcpy(slocal->s_humannode,config.c_humannode);
 245         strcpy(slocal->s_phonenum,config.c_phonenum);
 246
 247         slocal = NULL;
 248         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 249                 if (!strcasecmp(stemp->s_name,"internet")) slocal=stemp;
 250                 }
 251         if (slocal==NULL) {
 252                 slocal =(struct syslist *)malloc(sizeof(struct syslist));
 253                 slocal->next = slist;
 254                 slist = slocal;
 255                 }
 256         strcpy(slocal->s_name,"internet");
 257         strcpy(slocal->s_type,"uum");
 258         strcpy(slocal->s_nexthop,"%s");
 259         time(&slocal->s_lastcontact);
 260         strcpy(slocal->s_humannode,"Internet Gateway");
 261         strcpy(slocal->s_phonenum,"");
 262         strcpy(slocal->s_gdom,"");
 263
 264         }
 265
 266 /*
 267  * here's the routine to write the table back to disk.
 268  */
 269 void rewrite_syslist(void) {
 270         struct syslist *stemp;
 271         FILE *newfp;
 272         long now;
 273
 274         time(&now);
 275         newfp=fopen("network/mail.sysinfo","w");
 276         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 277                 if (!strcasecmp(stemp->s_name,config.c_nodename)) {
 278                         time(&stemp->s_lastcontact);
 279                         strcpy(stemp->s_type,"bin");
 280                         strcpy(stemp->s_humannode,config.c_humannode);
 281                         strcpy(stemp->s_phonenum,config.c_phonenum);
 282                         }
 283             /* remove systems we haven't heard from in a while */
 284             if ( (stemp->s_lastcontact == 0L)
 285                  || (now - stemp->s_lastcontact < EXPIRY_TIME) ) {
 286                 fprintf(newfp,"%s\n%s %s\n",
 287                         stemp->s_name,stemp->s_type,stemp->s_nexthop);
 288                 if (strlen(stemp->s_phonenum) > 0)
 289                         fprintf(newfp,"phonenum %s\n",stemp->s_phonenum);
 290                 if (strlen(stemp->s_gdom) > 0)
 291                         fprintf(newfp,"gdom %s\n",stemp->s_gdom);
 292                 if (strlen(stemp->s_humannode) > 0)
 293                         fprintf(newfp,"humannode %s\n",stemp->s_humannode);
 294                 if (stemp->s_lastcontact > 0L)
 295                         fprintf(newfp,"lastcontact %ld %s",
 296                                 stemp->s_lastcontact,
 297                                 asctime(localtime(&stemp->s_lastcontact)));
 298                 fprintf(newfp,"\n");
 299                 }
 300             }
 301         fclose(newfp);
 302         /* now free the list */
 303         while (slist!=NULL) {
 304                 stemp = slist;
 305                 slist = slist->next;
 306                 free(stemp);
 307                 }
 308         }
 309
 310
 311 /* call this function with the node name of a system and it returns a pointer
 312  * to its syslist structure.
 313  */
 314 struct syslist *get_sys_ptr(char *sysname)
 315 {
 316         static char sysnambuf[16];
 317         static struct syslist *sysptrbuf = NULL;
 318         struct syslist *stemp;
 319
 320         if ( (!strcmp(sysname,sysnambuf))
 321                 && (sysptrbuf!=NULL) )  return(sysptrbuf);
 322
 323         strcpy(sysnambuf,sysname);
 324         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 325                 if (!strcmp(sysname,stemp->s_name)) {
 326                         sysptrbuf = stemp;
 327                         return(stemp);
 328                         }
 329                 }
 330         sysptrbuf = NULL;
 331         return(NULL);
 332         }
 333
 334
 335 /*
 336  * make sure only one copy of netproc runs at a time, using lock files
 337  */
 338 int set_lockfile(void) {
 339         FILE *lfp;
 340         int onppid;
 341
 342         if ((lfp = fopen(LOCKFILE,"r")) != NULL) {
 343                 fscanf(lfp,"%d",&onppid);
 344                 fclose(lfp);
 345                 if (!kill(onppid, 0) || errno == EPERM) return 1;
 346                 }
 347
 348         lfp=fopen(LOCKFILE,"w");
 349         fprintf(lfp,"%d\n",getpid());
 350         fclose(lfp);
 351         return(0);
 352         }
 353
 354 void remove_lockfile(void) {
 355         unlink(LOCKFILE);
 356         }
 357
 358 /*
 359  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
 360  * cleanup() .  If for some reason netproc hangs waiting for the server
 361  * to clean up, the alarm clock goes off and the program exits anyway.
 362  * The cleanup() routine makes a check to ensure it's not reentering, in
 363  * case the ipc module looped it somehow.
 364  */
 365 void nq_cleanup(int e)
 366 {
 367         remove_lockfile();
 368         exit(e);
 369         }
 370
 371 void cleanup(int e)
 372 {
 373         static int nested = 0;
 374
 375         alarm(30);
 376         signal(SIGALRM,nq_cleanup);
 377         if (nested++ < 1) serv_puts("QUIT");
 378         nq_cleanup(e);
 379         }
 380
 381 /*
 382  * This is implemented as a function rather than as a macro because the
 383  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 384  * when a problem connecting or staying connected to the server occurs.
 385  */
 386 void logoff(int e)
 387 {
 388         cleanup(e);
 389         }
 390
 391 /*
 392  * If there is a kill file in place, this function will process it.
 393  */
 394 void load_filterlist(void) {
 395         FILE *fp;
 396         struct filterlist *fbuf;
 397         char sbuf[256];
 398         int a,p;
 399         fp=fopen("./network/filterlist","r");
 400         if (fp==NULL) return;
 401         while (fgets(sbuf,256,fp)!=NULL) {
 402                 if (sbuf[0]!='#') {
 403                         sbuf[strlen(sbuf)-1]=0;
 404                         fbuf=(struct filterlist *)
 405                                 malloc((long)sizeof(struct filterlist));
 406                         fbuf->next = filter;
 407                         filter = fbuf;
 408                         strcpy(fbuf->f_person,"*");
 409                         strcpy(fbuf->f_room,"*");
 410                         strcpy(fbuf->f_system,"*");
 411                         p = (-1);
 412                         for (a=strlen(sbuf); a>=0; --a) if (sbuf[a]==',') p=a;
 413                         if (p>=0) {
 414                                 sbuf[p] = 0;
 415                                 strcpy(fbuf->f_person,sbuf);
 416                                 strcpy(sbuf,&sbuf[p+1]);
 417                                 }
 418                         for (a=strlen(sbuf); a>=0; --a) if (sbuf[a]==',') p=a;
 419                         if (p>=0) {
 420                                 sbuf[p] = 0;
 421                                 strcpy(fbuf->f_room,sbuf);
 422                                 strcpy(sbuf,&sbuf[p+1]);
 423                                 }
 424                         strcpy(fbuf->f_system,sbuf);
 425                         }
 426                 }
 427         fclose(fp);
 428         }
 429
 430 /* returns 1 if user/message/room combination is in the kill file */
 431 int is_banned(char *k_person, char *k_room, char *k_system)
 432 {
 433         struct filterlist *fptr;
 434
 435         for (fptr=filter; fptr!=NULL; fptr=fptr->next) if (
 436          ((!strcasecmp(fptr->f_person,k_person))||(!strcmp(fptr->f_person,"*")))
 437         &&
 438          ((!strcasecmp(fptr->f_room,k_room))||(!strcmp(fptr->f_room,"*")))
 439         &&
 440          ((!strcasecmp(fptr->f_system,k_system))||(!strcmp(fptr->f_system,"*")))
 441         ) return(1);
 442
 443         return(0);
 444         }
 445
 446 int get_sysinfo_type(char *name)        /* determine routing from sysinfo file */
 447              {
 448         struct syslist *stemp;
 449 GETSN:  for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 450             if (!strcasecmp(stemp->s_name,name)) {
 451                 if (!strcasecmp(stemp->s_type,"use")) {
 452                         strcpy(name,stemp->s_nexthop);
 453                         goto GETSN;
 454                         }
 455                 if (!strcasecmp(stemp->s_type,"bin")) {
 456                         return(M_BINARY);
 457                         }
 458                 if (!strcasecmp(stemp->s_type,"uum")) {
 459                         return(M_INTERNET);
 460                         }
 461                 }
 462             }
 463         printf("netproc: cannot find system '%s' in mail.sysinfo\n",name);
 464         return(-1);
 465         }
 466
 467
 468 void fpgetfield(FILE *fp, char *string)
 469 {
 470         int a,b;
 471
 472         strcpy(string,"");
 473         a=0;
 474         do {
 475                 b=getc(fp);
 476                 if (b<1) {
 477                         string[a]=0;
 478                         return;
 479                         }
 480                 string[a]=b;
 481                 ++a;
 482                 } while (b!=0);
 483         }
 484
 485
 486
 487 /*
 488  * Load all of the fields of a message, except the actual text, into a
 489  * table in memory (so we know how to process the message).
 490  */
 491 void msgfind(char *msgfile, struct minfo *buffer)
 492 {
 493         int b,e,mtype,aflag;
 494         char bbb[1024];
 495         char userid[1024];
 496         FILE *fp;
 497
 498         strcpy(userid,"");
 499         fp=fopen(msgfile,"rb");
 500         if (fp==NULL) {
 501                 fprintf(stderr,"Can't open message file: %s\n",strerror(errno));
 502                 return;
 503                 }
 504         e=getc(fp);
 505         if (e!=255) {
 506                 fprintf(stdout,"Incorrect message format\n");
 507                 goto END;
 508                 }
 509         mtype=getc(fp); aflag=getc(fp);
 510         buffer->I=0L;
 511         buffer->R[0]=0;
 512         buffer->E[0]=0;
 513         buffer->H[0]=0;
 514         buffer->S[0]=0;
 515         buffer->B[0]=0;
 516         buffer->G[0]=0;
 517
 518 BONFGM: b=getc(fp); if (b<0) goto END;
 519         if (b=='M') goto END;
 520         fpgetfield(fp,bbb);
 521         while ((bbb[0]==' ')&&(strlen(bbb)>1)) strcpy(bbb,&bbb[1]);
 522         if (b=='A') {
 523                 strcpy(buffer->A,bbb);
 524                 if (strlen(userid)==0) {
 525                         strcpy(userid,bbb);
 526                         for (e=0; e<strlen(userid); ++e)
 527                                 if (userid[e]==' ') userid[e]='_';
 528                         }
 529                 }
 530         if (b=='O') strcpy(buffer->O,bbb);
 531         if (b=='C') strcpy(buffer->C,bbb);
 532         if (b=='N') strcpy(buffer->N,bbb);
 533         if (b=='S') strcpy(buffer->S,bbb);
 534         if (b=='P') {
 535                 /* extract the user id from the path */
 536                 for (e=0; e<strlen(bbb); ++e)
 537                         if (bbb[e]=='!') strcpy(userid,&bbb[e+1]);
 538
 539                 /* now find the next hop */
 540                 for (e=0; e<strlen(bbb); ++e) if (bbb[e]=='!') bbb[e]=0;
 541                 strcpy(buffer->nexthop,bbb);
 542                 }
 543         if (b=='R') {
 544                 for (e=0; e<strlen(bbb); ++e) if (bbb[e]=='_') bbb[e]=' ';
 545                 strcpy(buffer->R,bbb);
 546                 }
 547         if (b=='D') strcpy(buffer->D,bbb);
 548         if (b=='T') buffer->T=atol(bbb);
 549         if (b=='I') buffer->I=atol(bbb);
 550         if (b=='H') strcpy(buffer->H,bbb);
 551         if (b=='B') strcpy(buffer->B,bbb);
 552         if (b=='G') strcpy(buffer->G,bbb);
 553         if (b=='E') strcpy(buffer->E,bbb);
 554         goto BONFGM;
 555
 556 END:    if (buffer->I==0L) buffer->I=buffer->T;
 557         fclose(fp);
 558         }
 559
 560 void ship_to(char *filenm, char *sysnm) /* send spool file filenm to system sysnm */
 561
 562              {
 563         char sysflnm[100];
 564         char commbuf1[100];
 565         char commbuf2[100];
 566         FILE *sysflfd;
 567
 568 #ifdef DEBUG
 569         fprintf(stdout,"netproc: shipping %s to %s\n",filenm,sysnm);
 570 #endif
 571         sprintf(sysflnm,"./network/systems/%s",sysnm);
 572         sysflfd=fopen(sysflnm,"r");
 573         if (sysflfd==NULL) fprintf(stdout,"netproc: cannot open %s\n",sysflnm);
 574         fgets(commbuf1,99,sysflfd);
 575         commbuf1[strlen(commbuf1)-1] = 0;
 576         fclose(sysflfd);
 577         sprintf(commbuf2,commbuf1,filenm);
 578         system(commbuf2);
 579         }
 580
 581 /*
 582  * proc_file_transfer()  -  handle a simple file transfer packet
 583  */
 584 void proc_file_transfer(char *tname)
 585 {       /* name of temp file containing the whole message */
 586         char buf[128];
 587         char dest_dir[32];
 588         FILE *tfp,*uud;
 589         int a,b;
 590
 591         printf("netproc: processing network file transfer...\n");
 592         strcpy(dest_dir,config.c_bucket_dir);
 593
 594         tfp=fopen(tname,"rb");
 595         if (tfp==NULL) printf("netproc: cannot open %s\n",tname);
 596         getc(tfp); getc(tfp); getc(tfp);
 597         do {
 598                 a=getc(tfp);
 599                 if (a!='M') {
 600                         fpgetfield(tfp,buf);
 601                         if (a=='O') for (b=0; b<MAXROOMS; ++b) {
 602                                 if (!strcasecmp(buf,roomnames[b]))
 603                                         strcpy(dest_dir,roomdirs[b]);
 604                                 }
 605                         }
 606                 } while ((a!='M')&&(a>=0));
 607         if (a!='M') {
 608                 fclose(tfp);
 609                 printf("netproc: no message text for file transfer\n");
 610                 return;
 611                 }
 612
 613         sprintf(buf,"cd %s/files/%s; exec %s",bbs_home_directory,dest_dir,UUDECODE);
 614         uud=(FILE *)popen(buf,"w");
 615         if (uud==NULL) {
 616                 printf("netproc: cannot open uudecode pipe\n");
 617                 fclose(tfp);
 618                 return;
 619                 }
 620
 621         fgets(buf,128,tfp);
 622         buf[strlen(buf)-1] = 0;
 623         for (a=0; a<strlen(buf); ++a) if (buf[a]=='/') buf[a]='_';
 624         fprintf(uud,"%s\n",buf);
 625         printf("netproc: %s\n",buf);
 626         while(a=getc(tfp), a>0) putc(a,uud);
 627         fclose(tfp);
 628         pclose(uud);
 629         return;
 630         }
 631
 632
 633 /* send a bounce message */
 634 void bounce(struct minfo *bminfo)
 635 {
 636
 637         FILE *bounce;
 638         char bfilename[64];
 639         static int bseq = 1;
 640         long now;
 641
 642         sprintf(bfilename,"./network/spoolin/bounce.%d.%d",getpid(),bseq++);
 643         bounce = fopen(bfilename,"wb");
 644         time(&now);
 645
 646         fprintf(bounce,"%c%c%c",0xFF,MES_NORMAL,0);
 647         fprintf(bounce,"Ppostmaster%c",0);
 648         fprintf(bounce,"T%ld%c",now,0);
 649         fprintf(bounce,"APostmaster%c",0);
 650         fprintf(bounce,"OMail%c",0);
 651         fprintf(bounce,"N%s%c",config.c_nodename,0);
 652         fprintf(bounce,"H%s%c",config.c_humannode,0);
 653
 654         if (strlen(bminfo->E) > 0) {
 655                 fprintf(bounce,"R%s%c",bminfo->E,0);
 656                 }
 657         else {
 658                 fprintf(bounce,"R%s%c",bminfo->A,0);
 659                 }
 660
 661         fprintf(bounce,"D%s%c",bminfo->N,0);
 662         fprintf(bounce,"M%s could not deliver your mail to:\n",
 663                 config.c_humannode);
 664         fprintf(bounce," \n %s\n \n",bminfo->R);
 665         fprintf(bounce," because there is no such user on this system.\n");
 666         fprintf(bounce," (Unsent message does *not* follow.  ");
 667         fprintf(bounce,"Help to conserve bandwidth.)\n%c",0);
 668         fclose(bounce);
 669         }
 670
 671
 672
 673 /*
 674  * process incoming files in ./network/spoolin
 675  */
 676 void inprocess(void) {
 677         FILE *fp,*message,*testfp,*ls;
 678         static struct minfo minfo;
 679         struct recentmsg recentmsg;
 680         char tname[128],aaa[1024],iname[256],sfilename[256],pfilename[256];
 681         int a,b;
 682         int FieldID;
 683         struct syslist *stemp;
 684         char *ptr = NULL;
 685         char buf[256];
 686         long msglen;
 687         int bloklen;
 688
 689
 690         sprintf(tname,"/tmp/net.t%d",getpid()); /* temp file name */
 691         sprintf(iname,"/tmp/net.i%d",getpid()); /* temp file name */
 692
 693         load_filterlist();
 694
 695         chdir(bbs_home_directory);
 696
 697         /* Let the shell do the dirty work. Get all data from spoolin */
 698     do {
 699         sprintf(aaa,"cd %s/network/spoolin; ls",bbs_home_directory);
 700         ls=popen(aaa,"r");
 701         if (ls==NULL) {
 702                 fprintf(stderr,"netproc: could not open dir cmd: %s\n",
 703                         strerror(errno));
 704                 }
 705         if (ls!=NULL) {
 706                 do {
 707                         ptr=fgets(sfilename,256,ls);
 708                         if (ptr!=NULL) sfilename[strlen(sfilename)-1] = 0;
 709                         } while( (ptr!=NULL)&&((!strcmp(sfilename,"."))
 710                                  ||(!strcmp(sfilename,".."))));
 711                 if (ptr!=NULL) printf("netproc: processing %s\n",sfilename);
 712                 pclose(ls);
 713                 }
 714
 715       if (ptr!=NULL) {
 716         sprintf(pfilename,"%s/network/spoolin/%s",bbs_home_directory,sfilename);
 717         fprintf(stderr,"netproc: processing <%s>\n", pfilename);
 718         fflush(stderr);
 719
 720         fp = fopen(pfilename, "rb");
 721         if (fp == NULL) {
 722             fprintf(stderr, "netproc: cannot open <%s>: %s\n",
 723                         pfilename, strerror(errno));
 724             fflush(stderr);
 725             fp = fopen("/dev/null" ,"rb");
 726             }
 727
 728 NXMSG:  /* Seek to the beginning of the next message */
 729         do {
 730                 a=getc(fp);
 731                 } while((a!=255)&&(a>=0));
 732         if (a<0) goto ENDSTR;
 733
 734         message = fopen(tname,"wb");    /* This crates the temporary file. */
 735         if (message == NULL) {
 736                 fprintf(stderr, "Error creating %s: %s\n",
 737                         tname, strerror(errno));
 738                 goto ENDSTR;
 739                 }
 740         putc(255,message);              /* 0xFF (start-of-message) */
 741         a = getc(fp); putc(a, message); /* type */
 742         a = getc(fp); putc(a, message); /* mode */
 743         do {
 744                 FieldID = getc(fp);     /* Header field ID */
 745                 putc(FieldID, message);
 746                 do {
 747                         a = getc(fp);
 748                         putc(a, message);
 749                         } while (a > 0);
 750                 } while ((FieldID != 'M') && (a >= 0)); /* M is always last */
 751
 752         msglen = ftell(message);
 753         fclose(message);
 754
 755         /* process the individual mesage */
 756         minfo.D[0]=0;
 757         minfo.C[0]=0;
 758         minfo.B[0]=0;
 759         minfo.G[0]=0;
 760         minfo.R[0]=0;
 761         msgfind(tname,&minfo);
 762         strncpy(recentmsg.RMnodename,minfo.N,9);
 763         recentmsg.RMnodename[9]=0;
 764         recentmsg.RMnum=minfo.I;
 765         printf("netproc: #%ld fm <%s> in <%s> @ <%s>\n",
 766                 minfo.I,minfo.A,minfo.O,minfo.N);
 767         if (strlen(minfo.R)>0) {
 768                 printf("         to <%s>",minfo.R);
 769                 if (strlen(minfo.D)>0) {
 770                         printf(" @ <%s>",minfo.D);
 771                         }
 772                 printf("\n");
 773                 }
 774         fflush(stdout);
 775         if (!strcasecmp(minfo.D,FQDN)) strcpy(minfo.D,NODENAME);
 776
 777         /* this routine updates our info on the system that sent the message */
 778         stemp = get_sys_ptr(minfo.N);
 779         if ((stemp == NULL) && (get_sys_ptr(minfo.nexthop) != NULL)) {
 780                 /* add non-neighbor system to map */
 781                 printf("Adding non-neighbor system <%s> to map\n", slist->s_name);
 782                 stemp = (struct syslist *)malloc((long)sizeof(struct syslist));
 783                 stemp->next = slist;
 784                 slist = stemp;
 785                 strcpy(slist->s_name,minfo.N);
 786                 strcpy(slist->s_type,"use");
 787                 strcpy(slist->s_nexthop,minfo.nexthop);
 788                 time(&slist->s_lastcontact);
 789                 }
 790         else if ((stemp == NULL) && (!strcasecmp(minfo.N,minfo.nexthop))) {
 791                 /* add neighbor system to map */
 792                 printf("Adding neighbor system <%s> to map\n", slist->s_name);
 793                 sprintf(aaa,"%s/network/systems/%s",bbs_home_directory,minfo.N);
 794                 testfp=fopen(aaa,"r");
 795                 if (testfp!=NULL) {
 796                         fclose(testfp);
 797                         stemp = (struct syslist *)
 798                                 malloc((long)sizeof(struct syslist));
 799                         stemp->next = slist;
 800                         slist = stemp;
 801                         strcpy(slist->s_name,minfo.N);
 802                         strcpy(slist->s_type,"bin");
 803                         strcpy(slist->s_nexthop,"Mail");
 804                         time(&slist->s_lastcontact);
 805                         }
 806                 }
 807         /* now update last contact and long node name if we can */
 808         if (stemp!=NULL) {
 809                 time(&stemp->s_lastcontact);
 810                 if (strlen(minfo.H) > 0) strcpy(stemp->s_humannode,minfo.H);
 811                 if (strlen(minfo.B) > 0) strcpy(stemp->s_phonenum,minfo.B);
 812                 if (strlen(minfo.G) > 0) strcpy(stemp->s_gdom,minfo.G);
 813                 }
 814
 815         /* route the message if necessary */
 816         if ((strcasecmp(minfo.D,NODENAME))&&(minfo.D[0]!=0)) {
 817                 a = get_sysinfo_type(minfo.D);
 818                 printf("netproc: routing message to system <%s>\n",minfo.D);
 819                 fflush(stdout);
 820                 if (a==M_INTERNET) {
 821                         if (fork()==0) {
 822                                 printf("netproc: netmailer %s\n", tname);
 823                                 fflush(stdout);
 824                                 execlp("./netmailer","netmailer",
 825                                         tname,NULL);
 826                                 printf("netproc: error running netmailer: %s\n",
 827                                         strerror(errno));
 828                                 fflush(stdout);
 829                                 exit(errno);
 830                                 }
 831                         else while (wait(&b)!=(-1));
 832                         }
 833                 else if (a==M_BINARY) {
 834                         ship_to(tname,minfo.D);
 835                         }
 836                 else {
 837                         /* message falls into the bit bucket? */
 838                         }
 839                 }
 840
 841         /* check to see if it's a file transfer */
 842         else if (!strncasecmp(minfo.S,"FILE",4)) {
 843                 proc_file_transfer(tname);
 844                 }
 845
 846         /* otherwise process it as a normal message */
 847         else {
 848
 849                 if (!strcasecmp(minfo.R, "postmaster")) {
 850                         strcpy(minfo.R, "");
 851                         strcpy(minfo.C, "Aide");
 852                         }
 853
 854                 if (strlen(minfo.R) > 0) {
 855                         sprintf(buf,"GOTO _MAIL_");
 856                         }
 857                 if (is_banned(minfo.A,minfo.C,minfo.N)) {
 858                         sprintf(buf,"GOTO %s", FILTERROOM);
 859                         }
 860                 else {
 861                         if (strlen(minfo.C) > 0) {
 862                                 sprintf(buf,"GOTO %s", minfo.C);
 863                                 }
 864                         else {
 865                                 sprintf(buf,"GOTO %s", minfo.O);
 866                                 }
 867                         }
 868                 serv_puts(buf);
 869                 serv_gets(buf);
 870                 if (buf[0] != '2') {
 871                         puts(buf); fflush(stdout);
 872                         sprintf(buf,"GOTO _BITBUCKET_");
 873                         serv_puts(buf);
 874                         serv_gets(buf);
 875                         }
 876
 877                 /* Open the temporary file containing the message */
 878                 message = fopen(tname, "rb");
 879                 if (message == NULL) {
 880                         fprintf(stderr, "netproc: cannot open %s: %s\n",
 881                                 tname, strerror(errno));
 882                         unlink(tname);
 883                         goto NXMSG;
 884                         }
 885
 886                 /* Transmit the message to the server */
 887                 sprintf(buf, "ENT3 1|%s|%ld", minfo.R, msglen);
 888                 printf("< %s\n", buf);
 889                 serv_puts(buf);
 890                 serv_gets(buf);
 891                 printf("> %s\n", buf);
 892                 if (!strncmp(buf, "570", 3)) {
 893                         /* no such user, do a bounce */
 894                         bounce(&minfo);
 895                         }
 896                 if (buf[0] == '7') {
 897                         /* Always use the server's idea of the message length,
 898                          * even though they should both be identical */
 899                         msglen = atol(&buf[4]);
 900                         while (msglen > 0L) {
 901                                 bloklen = ((msglen >= 255L) ? 255 : ((int)msglen));
 902                                 if (fread(buf, bloklen, 1, message) < 1) {
 903                                         fprintf(stderr, "netproc: error trying to read %d bytes: %s\n",
 904                                                 bloklen, strerror(errno));
 905                                         fflush(stderr);
 906                                         }
 907                                 serv_write(buf, bloklen);
 908                                 msglen = msglen - (long)bloklen;
 909                                 }
 910                         serv_puts("NOOP");
 911                         serv_gets(buf);
 912                         }
 913                 else {
 914                         puts(buf);
 915                         fflush(stdout);
 916                         }
 917
 918                 fclose(message);
 919                 }
 920
 921         unlink(tname);
 922         goto NXMSG;
 923
 924 ENDSTR: fclose(fp);
 925         unlink(pfilename);
 926         }
 927       } while(ptr!=NULL);
 928     unlink(iname);
 929     }
 930
 931
 932 int checkpath(char *path, char *sys)    /* Checks to see whether its ok to send */
 933                         /* Returns 1 for ok, send message       */
 934             {           /* Returns 0 if message already there   */
 935         int a;
 936         char sys2[512];
 937         strcpy(sys2,sys);
 938         strcat(sys2,"!");
 939
 940 #ifdef DEBUG
 941         printf("netproc: checkpath <%s> <%s> ... ",path,sys);
 942 #endif
 943         for (a=0; a<strlen(path); ++a) {
 944                 if (!strncmp(&path[a],sys2,strlen(sys2))) return(0);
 945                 }
 946         return(1);
 947         }
 948
 949 /*
 950  * implement split horizon algorithm
 951  */
 952 int ismsgok(long int mpos, FILE *mmfp, char *sysname)
 953 {
 954         int a;
 955         int ok = 0;             /* fail safe - no path, don't send it */
 956         char fbuf[256];
 957
 958         fseek(mmfp,mpos,0);
 959         if (getc(mmfp)!=255) return(0);
 960         getc(mmfp); getc(mmfp);
 961
 962         while (a=getc(mmfp),((a!='M')&&(a!=0))) {
 963                 fpgetfield(mmfp,fbuf);
 964                 if (a=='P') {
 965                         ok = checkpath(fbuf,sysname);
 966                         }
 967                 }
 968 #ifdef DEBUG
 969         printf("%s\n", ((ok)?"SEND":"(no)") );
 970 #endif
 971         return(ok);
 972         }
 973
 974 int spool_out(struct msglist *cmlist, FILE *destfp, char *sysname)      /* spool list of messages to a file */
 975                                         /* returns # of msgs spooled */
 976
 977
 978 {
 979         struct msglist *cmptr;
 980         FILE *mmfp;
 981         char mmtemp[128];
 982         char fbuf[128];
 983         int a;
 984         int msgs_spooled = 0;
 985         long msg_len;
 986         int blok_len;
 987
 988         char buf[256];
 989         char curr_rm[256];
 990
 991         strcpy(curr_rm, "");
 992         sprintf(mmtemp, "/tmp/net.m%d", getpid());
 993
 994         /* for each message in the list... */
 995         for (cmptr=cmlist; cmptr!=NULL; cmptr=cmptr->next) {
 996
 997                 /* make sure we're in the correct room... */
 998                 if (strcasecmp(curr_rm, cmptr->m_rmname)) {
 999                         sprintf(buf, "GOTO %s", cmptr->m_rmname);
1000                         serv_puts(buf);
1001                         serv_gets(buf);
1002                         if (buf[0] == '2') {
1003                                 strcpy(curr_rm, cmptr->m_rmname);
1004                                 }
1005                         else {
1006                                 fprintf(stderr,"%s\n", buf);
1007                                 }
1008                         }
1009
1010                 /* download the message from the server... */
1011                 mmfp = fopen(mmtemp, "wb");
1012                 sprintf(buf, "MSG3 %ld", cmptr->m_num);
1013                 serv_puts(buf);
1014                 serv_gets(buf);
1015                 if (buf[0]=='6') {                      /* read the msg */
1016                         msg_len = atol(&buf[4]);
1017                         while (msg_len > 0L) {
1018                                 blok_len = ((msg_len >= 256L) ? 256 : (int)msg_len);
1019                                 serv_read(buf, blok_len);
1020                                 fwrite(buf, blok_len, 1, mmfp);
1021                                 msg_len = msg_len - (long)blok_len;
1022                                 }
1023                         }
1024                 else {                                  /* or print the err */
1025                         fprintf(stderr, "%s\n", buf);
1026                         }
1027                 fclose(mmfp);
1028
1029                 mmfp = fopen(mmtemp,"rb");
1030
1031                 if (ismsgok(0L,mmfp,sysname)) {
1032                         ++msgs_spooled;
1033                         fflush(stdout);
1034                         fseek(mmfp,0L,0);
1035                         fread(fbuf,3,1,mmfp);
1036                         fwrite(fbuf,3,1,destfp);
1037                         while (a=getc(mmfp),((a!=0)&&(a!='M'))) {
1038                                 if (a!='C') putc(a,destfp);
1039                                 fpgetfield(mmfp,fbuf);
1040                                 if (a=='P') fprintf(destfp,"%s!",NODENAME);
1041                                 if (a!='C')
1042                                         fwrite(fbuf,strlen(fbuf)+1,1,destfp);
1043                                 }
1044                         if (a=='M') {
1045                                 fprintf(destfp, "C%s%c",
1046                                         cmptr->m_rmname, 0);
1047                                 putc('M',destfp);
1048                                 do {
1049                                         a=getc(mmfp);
1050                                         putc(a,destfp);
1051                                         } while(a>0);
1052                                 }
1053                         }
1054                 fclose(mmfp);
1055                 }
1056
1057         unlink(mmtemp);
1058         return(msgs_spooled);
1059         }
1060
1061 void outprocess(char *sysname) /* send new room messages to sysname */
1062                {
1063         char sysflnm[64];
1064         char srmname[32];
1065         char shiptocmd[128];
1066         char lbuf[64];
1067         char tempflnm[64];
1068         char buf[256];
1069         struct msglist *cmlist = NULL;
1070         struct rmlist *crmlist = NULL;
1071         struct rmlist *rmptr,*rmptr2;
1072         struct msglist *cmptr,*cmptr2;
1073         FILE *sysflfp,*tempflfp;
1074         int outgoing_msgs;
1075         long thismsg;
1076
1077         sprintf(tempflnm,"/tmp/%s.%d",NODENAME,getpid());
1078         tempflfp=fopen(tempflnm,"w");
1079         if (tempflfp==NULL) return;
1080
1081
1082 /*
1083  * Read system file for node in question and put together room list
1084  */
1085         sprintf(sysflnm,"%s/network/systems/%s",bbs_home_directory,sysname);
1086         sysflfp=fopen(sysflnm,"r");
1087         if (sysflfp==NULL) return;
1088         fgets(shiptocmd,128,sysflfp); shiptocmd[strlen(shiptocmd)-1]=0;
1089         while(!feof(sysflfp)) {
1090                 if (fgets(srmname,32,sysflfp)==NULL) break;
1091                 srmname[strlen(srmname)-1]=0;
1092                 fgets(lbuf,32,sysflfp);
1093                 rmptr=(struct rmlist *)malloc(sizeof(struct rmlist));
1094                 rmptr->next = NULL;
1095                 strcpy(rmptr->rm_name,srmname);
1096                 strip_trailing_whitespace(rmptr->rm_name);
1097                 rmptr->rm_lastsent = atol(lbuf);
1098                 if (crmlist==NULL) crmlist=rmptr;
1099                 else if (!strcasecmp(rmptr->rm_name,"control")) {
1100                         /* control has to be first in room list */
1101                         rmptr->next = crmlist;
1102                         crmlist = rmptr;
1103                         }
1104                 else {
1105                         rmptr2=crmlist;
1106                         while (rmptr2->next != NULL) rmptr2=rmptr2->next;
1107                         rmptr2->next=rmptr;
1108                         }
1109                 }
1110         fclose(sysflfp);
1111
1112 /*
1113  * Assemble list of messages to be spooled
1114  */
1115         for (rmptr=crmlist; rmptr!=NULL; rmptr=rmptr->next) {
1116
1117                 sprintf(buf,"GOTO %s",rmptr->rm_name);
1118                 serv_puts(buf);
1119                 serv_gets(buf);
1120                 if (buf[0]!='2') {
1121                         fprintf(stderr, "%s\n", buf);
1122                         }
1123                 else {
1124                         sprintf(buf, "MSGS GT|%ld", rmptr->rm_lastsent);
1125                         serv_puts(buf);
1126                         serv_gets(buf);
1127                         if (buf[0]=='1') while (serv_gets(buf), strcmp(buf,"000")) {
1128                                 thismsg = atol(buf);
1129                                 if ( thismsg > (rmptr->rm_lastsent) ) {
1130                                         rmptr->rm_lastsent = thismsg;
1131
1132                                 cmptr=(struct msglist *)
1133                                       malloc(sizeof(struct msglist));
1134                                         cmptr->next = NULL;
1135                                         cmptr->m_num = thismsg;
1136                                         strcpy(cmptr->m_rmname, rmptr->rm_name);
1137
1138                                         if (cmlist == NULL) cmlist = cmptr;
1139                                         else {
1140                                                 cmptr2 = cmlist;
1141                                                 while (cmptr2->next != NULL)
1142                                                 cmptr2 = cmptr2->next;
1143                                                 cmptr2->next = cmptr;
1144                                                 }
1145                                         }
1146                                 }
1147                         else {          /* print error from "msgs all" */
1148                                 fprintf(stderr, "%s\n", buf);
1149                                 }
1150                         }
1151                 }
1152
1153         outgoing_msgs=0; cmptr2=cmlist; /* this loop counts the messages */
1154         while (cmptr2!=NULL) {
1155                 ++outgoing_msgs;
1156                 cmptr2 = cmptr2->next;
1157                 }
1158         printf("netproc: %d messages to be spooled to %s\n",
1159                 outgoing_msgs,sysname);
1160         fflush(stdout);
1161
1162 /*
1163  * Spool out the messages, but only if there are any.
1164  */
1165         fflush(stdout);
1166         if (outgoing_msgs!=0) outgoing_msgs=spool_out(cmlist,tempflfp,sysname);
1167         printf("netproc: %d messages actually spooled\n",
1168                 outgoing_msgs);
1169         fflush(stdout);
1170
1171 /*
1172  * Deallocate list of spooled messages.
1173  */
1174         while(cmlist!=NULL) {
1175                 cmptr=cmlist->next;
1176                 free(cmlist);
1177                 cmlist=cmptr;
1178                 }
1179
1180 /*
1181  * Rewrite system file and deallocate room list.
1182  */
1183         printf("Spooling...\n");
1184         fflush(stdout);
1185         sysflfp=fopen(sysflnm,"w");
1186         fprintf(sysflfp,"%s\n",shiptocmd);
1187         for (rmptr=crmlist; rmptr!=NULL; rmptr=rmptr->next)
1188                 fprintf(sysflfp,"%s\n%ld\n",rmptr->rm_name,rmptr->rm_lastsent);
1189         fclose(sysflfp);
1190         while(crmlist!=NULL) {
1191                 rmptr=crmlist->next;
1192                 free(crmlist);
1193                 crmlist=rmptr;
1194                 }
1195
1196 /*
1197  * Close temporary file, ship it out, and return
1198  */
1199         fclose(tempflfp);
1200         if (outgoing_msgs!=0) ship_to(tempflnm,sysname);
1201         unlink(tempflnm);
1202         }
1203
1204
1205 /*
1206  * Connect netproc to the Citadel server running on this computer.
1207  */
1208 void np_attach_to_server(void) {
1209         char buf[256];
1210         char portname[8];
1211         char *args[] = { "netproc", "localhost", NULL, NULL } ;
1212
1213         printf("Attaching to server...\n");
1214         sprintf(portname, "%d", config.c_port_number);
1215         args[2] = portname;
1216         attach_to_server(3, args);
1217         serv_gets(buf);
1218         printf("%s\n",&buf[4]);
1219         sprintf(buf,"IPGM %d", config.c_ipgm_secret);
1220         serv_puts(buf);
1221         serv_gets(buf);
1222         printf("%s\n",&buf[4]);
1223         if (buf[0]!='2') {
1224                 cleanup(2);
1225                 }
1226         }
1227
1228
1229
1230 /*
1231  * main
1232  */
1233 void main(int argc, char **argv)
1234 {
1235         char allst[32];
1236         FILE *allfp;
1237         int a;
1238
1239
1240         strcpy(bbs_home_directory, BBSDIR);
1241
1242         /*
1243          * Change directories if specified
1244          */
1245         if (argv > 0) for (a=1; a<argc; ++a) {
1246                 if (!strncmp(argv[a], "-h", 2)) {
1247                         strcpy(bbs_home_directory, argv[a]);
1248                         strcpy(bbs_home_directory, &bbs_home_directory[2]);
1249                         home_specified = 1;
1250                         }
1251                 else {
1252                         fprintf(stderr, "netproc: usage: netproc [-hHomeDir]\n");
1253                         exit(1);
1254                         }
1255                 }
1256
1257         get_config();
1258
1259         /* write all messages to the log from this point onward */
1260         freopen(NPLOGFILE,NPLOGMODE,stdout);
1261         freopen(NPLOGFILE,NPLOGMODE,stderr);
1262
1263         if (set_lockfile()!=0) {
1264                 fprintf(stderr,"netproc: lock file exists: already running\n");
1265                 cleanup(1);
1266                 }
1267
1268         signal(SIGINT,cleanup);
1269         signal(SIGQUIT,cleanup);
1270         signal(SIGHUP,cleanup);
1271         signal(SIGTERM,cleanup);
1272
1273         printf("netproc: started.  pid=%d\n",getpid());
1274         fflush(stdout);
1275         np_attach_to_server();
1276         fflush(stdout);
1277
1278         if (load_roomnames()!=0) fprintf(stdout,"netproc: cannot load rooms\n");
1279         if (load_syslist()!=0) fprintf(stdout,"netproc: cannot load sysinfo\n");
1280         setup_special_nodes();
1281
1282         inprocess();    /* first collect incoming stuff */
1283
1284         allfp=(FILE *)popen("cd ./network/systems; ls","r");
1285         if (allfp!=NULL) {
1286                 while (fgets(allst,32,allfp)!=NULL) {
1287                         allst[strlen(allst)-1] = 0;
1288                         outprocess(allst);
1289                         }
1290                 pclose(allfp);
1291                 }
1292
1293         inprocess();    /* incoming again in case anything new was generated */
1294         rewrite_syslist();
1295         printf("netproc: processing ended.\n");
1296         cleanup(0);
1297         }
1298