mdw@git.distorted.org.uk Git - ezmlm/blob - ezmlm-manage.c

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include "error.h"
   4 #include "stralloc.h"
   5 #include "str.h"
   6 #include "env.h"
   7 #include "sig.h"
   8 #include "slurp.h"
   9 #include "getconf.h"
  10 #include "strerr.h"
  11 #include "byte.h"
  12 #include "getln.h"
  13 #include "case.h"
  14 #include "qmail.h"
  15 #include "substdio.h"
  16 #include "readwrite.h"
  17 #include "seek.h"
  18 #include "quote.h"
  19 #include "datetime.h"
  20 #include "now.h"
  21 #include "date822fmt.h"
  22 #include "fmt.h"
  23 #include "subscribe.h"
  24 #include "cookie.h"
  25
  26 #define FATAL "ezmlm-manage: fatal: "
  27 void die_usage() { strerr_die1x(100,"ezmlm-manage: usage: ezmlm-manage dir"); }
  28 void die_nomem() { strerr_die2x(111,FATAL,"out of memory"); }
  29 void die_badaddr()
  30 {
  31   strerr_die2x(100,FATAL,"I do not accept messages at this address (#5.1.1)");
  32 }
  33
  34 stralloc inhost = {0};
  35 stralloc outhost = {0};
  36 stralloc inlocal = {0};
  37 stralloc outlocal = {0};
  38 stralloc key = {0};
  39 stralloc mailinglist = {0};
  40
  41 datetime_sec when;
  42 struct datetime dt;
  43
  44 char strnum[FMT_ULONG];
  45 char date[DATE822FMT];
  46 char hash[COOKIE];
  47 datetime_sec hashdate;
  48 stralloc target = {0};
  49 stralloc confirm = {0};
  50 stralloc line = {0};
  51 stralloc quoted = {0};
  52
  53 int hashok(action)
  54 char *action;
  55 {
  56   char *x;
  57   unsigned long u;
  58
  59   x = action + 4;
  60   x += scan_ulong(x,&u);
  61   hashdate = u;
  62   if (hashdate > when) return 0;
  63   if (hashdate < when - 1000000) return 0;
  64
  65   u = hashdate;
  66   strnum[fmt_ulong(strnum,u)] = 0;
  67   cookie(hash,key.s,key.len,strnum,target.s,action + 1);
  68
  69   if (*x == '.') ++x;
  70   if (str_len(x) != COOKIE) return 0;
  71   return byte_equal(hash,COOKIE,x);
  72 }
  73
  74 struct qmail qq;
  75 int qqwrite(fd,buf,len) int fd; char *buf; unsigned int len;
  76 {
  77   qmail_put(&qq,buf,len);
  78   return len;
  79 }
  80 char qqbuf[1];
  81 substdio ssqq = SUBSTDIO_FDBUF(qqwrite,-1,qqbuf,sizeof(qqbuf));
  82
  83 char inbuf[1024];
  84 substdio ssin = SUBSTDIO_FDBUF(read,0,inbuf,sizeof(inbuf));
  85 substdio ssin2 = SUBSTDIO_FDBUF(read,0,inbuf,sizeof(inbuf));
  86
  87 substdio sstext;
  88 char textbuf[1024];
  89
  90 void copy(fn)
  91 char *fn;
  92 {
  93   int fd;
  94   int match;
  95
  96   fd = open_read(fn);
  97   if (fd == -1)
  98     strerr_die4sys(111,FATAL,"unable to open ",fn,": ");
  99
 100   substdio_fdbuf(&sstext,read,fd,textbuf,sizeof(textbuf));
 101   for (;;) {
 102     if (getln(&sstext,&line,&match,'\n') == -1)
 103       strerr_die4sys(111,FATAL,"unable to read ",fn,": ");
 104
 105     if (match)
 106       if (line.s[0] == '!') {
 107         if (line.s[1] == 'R') {
 108           qmail_puts(&qq,"   ");
 109           qmail_puts(&qq,confirm.s);
 110           qmail_puts(&qq,"\n");
 111           continue;
 112         }
 113         if (line.s[1] == 'A') {
 114           qmail_puts(&qq,"   ");
 115           qmail_puts(&qq,target.s);
 116           qmail_puts(&qq,"\n");
 117           continue;
 118         }
 119       }
 120
 121     qmail_put(&qq,line.s,line.len);
 122
 123     if (!match)
 124       break;
 125   }
 126
 127   close(fd);
 128 }
 129
 130 stralloc mydtline = {0};
 131
 132 void main(argc,argv)
 133 int argc;
 134 char **argv;
 135 {
 136   char *dir;
 137   char *sender;
 138   char *host;
 139   char *local;
 140   char *action;
 141   int fd;
 142   int i;
 143   int flagconfirm;
 144   int flaghashok;
 145   int flaggoodfield;
 146   int match;
 147
 148   umask(022);
 149   sig_pipeignore();
 150   when = now();
 151
 152   dir = argv[1];
 153   if (!dir) die_usage();
 154
 155   sender = env_get("SENDER");
 156   if (!sender) strerr_die2x(100,FATAL,"SENDER not set");
 157   local = env_get("LOCAL");
 158   if (!local) strerr_die2x(100,FATAL,"LOCAL not set");
 159   host = env_get("HOST");
 160   if (!host) strerr_die2x(100,FATAL,"HOST not set");
 161
 162   if (!*sender)
 163     strerr_die2x(100,FATAL,"I don't reply to bounce messages (#5.7.2)");
 164   if (!sender[str_chr(sender,'@')])
 165     strerr_die2x(100,FATAL,"I don't reply to senders without host names (#5.7.2)");
 166   if (str_equal(sender,"#@[]"))
 167     strerr_die2x(100,FATAL,"I don't reply to bounce messages (#5.7.2)");
 168
 169   if (chdir(dir) == -1)
 170     strerr_die4sys(111,FATAL,"unable to switch to ",dir,": ");
 171
 172   switch(slurp("key",&key,32)) {
 173     case -1:
 174       strerr_die4sys(111,FATAL,"unable to read ",dir,"/key: ");
 175     case 0:
 176       strerr_die3x(100,FATAL,dir,"/key does not exist");
 177   }
 178   getconf_line(&mailinglist,"mailinglist",1,FATAL,dir);
 179   getconf_line(&inhost,"inhost",1,FATAL,dir);
 180   getconf_line(&inlocal,"inlocal",1,FATAL,dir);
 181   getconf_line(&outhost,"outhost",1,FATAL,dir);
 182   getconf_line(&outlocal,"outlocal",1,FATAL,dir);
 183
 184   if (inhost.len != str_len(host)) die_badaddr();
 185   if (case_diffb(inhost.s,inhost.len,host)) die_badaddr();
 186   if (inlocal.len > str_len(local)) die_badaddr();
 187   if (case_diffb(inlocal.s,inlocal.len,local)) die_badaddr();
 188
 189   action = local + inlocal.len;
 190
 191   switch(slurp("public",&line,1)) {
 192     case -1:
 193       strerr_die4sys(111,FATAL,"unable to read ",dir,"/public: ");
 194     case 0:
 195       strerr_die2x(100,FATAL,"sorry, I've been told to reject all requests (#5.7.2)");
 196   }
 197
 198   if (!stralloc_copys(&target,sender)) die_nomem();
 199   if (action[0]) {
 200     i = 1 + str_chr(action + 1,'-');
 201     if (action[i]) {
 202       action[i] = 0;
 203       if (!stralloc_copys(&target,action + i + 1)) die_nomem();
 204       i = byte_rchr(target.s,target.len,'=');
 205       if (i < target.len)
 206         target.s[i] = '@';
 207     }
 208   }
 209   if (!stralloc_0(&target)) die_nomem();
 210   if (!stralloc_copys(&confirm,"")) die_nomem();
 211
 212   if (qmail_open(&qq) == -1)
 213     strerr_die2sys(111,FATAL,"unable to run qmail-queue: ");
 214
 215   qmail_puts(&qq,"Mailing-List: ");
 216   qmail_put(&qq,mailinglist.s,mailinglist.len);
 217   qmail_puts(&qq,"\nDate: ");
 218   datetime_tai(&dt,when);
 219   qmail_put(&qq,date,date822fmt(date,&dt));
 220   qmail_puts(&qq,"Message-ID: <");
 221   qmail_put(&qq,strnum,fmt_ulong(strnum,(unsigned long) when));
 222   qmail_puts(&qq,".");
 223   qmail_put(&qq,strnum,fmt_ulong(strnum,(unsigned long) getpid()));
 224   qmail_puts(&qq,".ezmlm@");
 225   qmail_put(&qq,outhost.s,outhost.len);
 226   qmail_puts(&qq,">\nFrom: ");
 227   if (!quote(&quoted,&outlocal)) die_nomem();
 228   qmail_put(&qq,quoted.s,quoted.len);
 229   qmail_puts(&qq,"-help@");
 230   qmail_put(&qq,outhost.s,outhost.len);
 231   qmail_puts(&qq,"\nTo: ");
 232   if (!quote2(&quoted,target.s)) die_nomem();
 233   qmail_put(&qq,quoted.s,quoted.len);
 234   qmail_puts(&qq,"\n");
 235
 236   flaghashok = 1;
 237   if (str_start(action,"-sc.")) flaghashok = hashok(action);
 238   if (str_start(action,"-uc.")) flaghashok = hashok(action);
 239
 240   flagconfirm = 0;
 241   if (str_equal(action,"-subscribe")) flagconfirm = 1;
 242   if (str_equal(action,"-unsubscribe")) flagconfirm = 1;
 243   if (!flaghashok) flagconfirm = 1;
 244
 245   if (flagconfirm) {
 246     strnum[fmt_ulong(strnum,(unsigned long) when)] = 0;
 247     cookie(hash,key.s,key.len,strnum,target.s,action + 1);
 248     if (!stralloc_copy(&confirm,&outlocal)) die_nomem();
 249     if (!stralloc_cats(&confirm,"-")) die_nomem();
 250     if (!stralloc_catb(&confirm,action + 1,1)) die_nomem();
 251     if (!stralloc_cats(&confirm,"c.")) die_nomem();
 252     if (!stralloc_cats(&confirm,strnum)) die_nomem();
 253     if (!stralloc_cats(&confirm,".")) die_nomem();
 254     if (!stralloc_catb(&confirm,hash,COOKIE)) die_nomem();
 255     if (!stralloc_cats(&confirm,"-")) die_nomem();
 256     i = str_rchr(target.s,'@');
 257     if (!stralloc_catb(&confirm,target.s,i)) die_nomem();
 258     if (target.s[i]) {
 259       if (!stralloc_cats(&confirm,"=")) die_nomem();
 260       if (!stralloc_cats(&confirm,target.s + i + 1)) die_nomem();
 261     }
 262     if (!stralloc_cats(&confirm,"@")) die_nomem();
 263     if (!stralloc_cat(&confirm,&outhost)) die_nomem();
 264     if (!stralloc_0(&confirm)) die_nomem();
 265
 266     qmail_puts(&qq,"Reply-To: ");
 267     if (!quote2(&quoted,confirm.s)) die_nomem();
 268     qmail_put(&qq,quoted.s,quoted.len);
 269     qmail_puts(&qq,"\n");
 270   }
 271   if (!stralloc_0(&confirm)) die_nomem();
 272
 273   qmail_puts(&qq,"Subject: ezmlm response\n");
 274
 275   if (!stralloc_copys(&mydtline,"Delivered-To: responder for ")) die_nomem();
 276   if (!stralloc_catb(&mydtline,outlocal.s,outlocal.len)) die_nomem();
 277   if (!stralloc_cats(&mydtline,"@")) die_nomem();
 278   if (!stralloc_catb(&mydtline,outhost.s,outhost.len)) die_nomem();
 279   if (!stralloc_cats(&mydtline,"\n")) die_nomem();
 280
 281   qmail_put(&qq,mydtline.s,mydtline.len);
 282
 283   flaggoodfield = 0;
 284   for (;;) {
 285     if (getln(&ssin,&line,&match,'\n') == -1)
 286       strerr_die2sys(111,FATAL,"unable to read input: ");
 287     if (!match) break;
 288     if (line.len == 1) break;
 289     if ((line.s[0] != ' ') && (line.s[0] != '\t')) {
 290       flaggoodfield = 0;
 291       if (case_startb(line.s,line.len,"mailing-list:"))
 292         strerr_die2x(100,FATAL,"incoming message has Mailing-List (#5.7.2)");
 293       if (line.len == mydtline.len)
 294         if (byte_equal(line.s,line.len,mydtline.s))
 295           strerr_die2x(100,FATAL,"this message is looping: it already has my Delivered-To line (#5.4.6)");
 296       if (case_startb(line.s,line.len,"delivered-to:"))
 297         flaggoodfield = 1;
 298       if (case_startb(line.s,line.len,"received:"))
 299         flaggoodfield = 1;
 300     }
 301     if (flaggoodfield)
 302       qmail_put(&qq,line.s,line.len);
 303   }
 304   if (seek_begin(0) == -1)
 305     strerr_die2sys(111,FATAL,"unable to seek input: ");
 306
 307   qmail_puts(&qq,"\n");
 308   copy("text/top");
 309   if (str_equal(action,"-subscribe"))
 310     copy("text/sub-confirm");
 311   else if (str_equal(action,"-unsubscribe"))
 312     copy("text/unsub-confirm");
 313   else if (str_start(action,"-sc.")) {
 314     if (!flaghashok)
 315       copy("text/sub-bad");
 316     else
 317       switch(subscribe(target.s,1)) {
 318         case -1: strerr_die1(111,FATAL,&subscribe_err);
 319         case -2: strerr_die1(100,FATAL,&subscribe_err);
 320         case 1: log("+",target.s); copy("text/sub-ok"); break;
 321         default: copy("text/sub-nop"); break;
 322       }
 323   }
 324   else if (str_start(action,"-uc.")) {
 325     if (!flaghashok)
 326       copy("text/unsub-bad");
 327     else
 328       switch(subscribe(target.s,0)) {
 329         case -1: strerr_die1(111,FATAL,&subscribe_err);
 330         case -2: strerr_die1(100,FATAL,&subscribe_err);
 331         case 1: log("-",target.s); copy("text/unsub-ok"); break;
 332         default: copy("text/unsub-nop"); break;
 333       }
 334   }
 335   else if (str_start(action,"-get.")) {
 336     unsigned long u;
 337     struct stat st;
 338     char ch;
 339     int r;
 340
 341     scan_ulong(action + 5,&u);
 342
 343     if (!stralloc_copys(&line,"archive/")) die_nomem();
 344     if (!stralloc_catb(&line,strnum,fmt_ulong(strnum,u / 100))) die_nomem();
 345     if (!stralloc_cats(&line,"/")) die_nomem();
 346     if (!stralloc_catb(&line,strnum,fmt_uint0(strnum,(unsigned int) (u % 100),2))) die_nomem();
 347     if (!stralloc_0(&line)) die_nomem();
 348
 349     fd = open_read(line.s);
 350     if (fd == -1)
 351       if (errno != error_noent)
 352         strerr_die4sys(111,FATAL,"unable to open ",line.s,": ");
 353       else
 354         copy("text/get-bad");
 355     else {
 356       if (fstat(fd,&st) == -1)
 357         copy("text/get-bad");
 358       else if (!(st.st_mode & 0100))
 359         copy("text/get-bad");
 360       else {
 361         substdio_fdbuf(&sstext,read,fd,textbuf,sizeof(textbuf));
 362         qmail_puts(&qq,"> ");
 363         for (;;) {
 364           r = substdio_get(&sstext,&ch,1);
 365           if (r == -1) strerr_die4sys(111,FATAL,"unable to read ",line.s,": ");
 366           if (r == 0) break;
 367           qmail_put(&qq,&ch,1);
 368           if (ch == '\n') qmail_puts(&qq,"> ");
 369         }
 370         qmail_puts(&qq,"\n");
 371       }
 372       close(fd);
 373     }
 374   }
 375   else
 376     copy("text/help");
 377
 378   copy("text/bottom");
 379
 380   qmail_puts(&qq,"Return-Path: <");
 381   if (!quote2(&quoted,sender)) die_nomem();
 382   qmail_put(&qq,quoted.s,quoted.len);
 383   qmail_puts(&qq,">\n");
 384   if (substdio_copy(&ssqq,&ssin2) != 0)
 385     strerr_die2sys(111,FATAL,"unable to read input: ");
 386
 387   if (!stralloc_copy(&line,&outlocal)) die_nomem();
 388   if (!stralloc_cats(&line,"-return-@")) die_nomem();
 389   if (!stralloc_cat(&line,&outhost)) die_nomem();
 390   if (!stralloc_0(&line)) die_nomem();
 391   qmail_from(&qq,line.s);
 392
 393   qmail_to(&qq,target.s);
 394
 395   switch(qmail_close(&qq)) {
 396     case 0:
 397       strnum[fmt_ulong(strnum,qmail_qp(&qq))] = 0;
 398       strerr_die2x(0,"ezmlm-manage: info: qp ",strnum);
 399     default:
 400       /* don't worry about undoing actions; everything is idempotent */
 401       strerr_die2x(111,FATAL,"temporary qmail-queue error");
 402   }
 403 }