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

   1 #include "stralloc.h"
   2 #include "str.h"
   3 #include "env.h"
   4 #include "sig.h"
   5 #include "slurp.h"
   6 #include "getconf.h"
   7 #include "strerr.h"
   8 #include "byte.h"
   9 #include "case.h"
  10 #include "getln.h"
  11 #include "substdio.h"
  12 #include "error.h"
  13 #include "quote.h"
  14 #include "readwrite.h"
  15 #include "fmt.h"
  16 #include "now.h"
  17 #include "cookie.h"
  18 #include "subscribe.h"
  19 #include "issub.h"
  20
  21 #define FATAL "ezmlm-return: fatal: "
  22 void die_usage() { strerr_die1x(100,"ezmlm-return: usage: ezmlm-return dir"); }
  23 void die_nomem() { strerr_die2x(111,FATAL,"out of memory"); }
  24 void die_badaddr()
  25 {
  26   strerr_die2x(100,FATAL,"I do not accept messages at this address (#5.1.1)");
  27 }
  28 void die_trash()
  29 {
  30   strerr_die1x(0,"ezmlm-return: info: trash address");
  31 }
  32
  33 char outbuf[1024];
  34 substdio ssout;
  35 char inbuf[1024];
  36 substdio ssin;
  37
  38 char strnum[FMT_ULONG];
  39 char hash[COOKIE];
  40 char hashcopy[COOKIE];
  41 unsigned long cookiedate;
  42 stralloc fndate = {0};
  43 stralloc fndatenew = {0};
  44 stralloc fnhash = {0};
  45 stralloc fnhashnew = {0};
  46
  47 stralloc quoted = {0};
  48 char *sender;
  49
  50 void die_hashnew()
  51 { strerr_die4sys(111,FATAL,"unable to write ",fnhashnew.s,": "); }
  52 void die_datenew()
  53 { strerr_die4sys(111,FATAL,"unable to write ",fndatenew.s,": "); }
  54 void die_msgin()
  55 { strerr_die2sys(111,FATAL,"unable to read input: "); }
  56
  57 void dowit(addr,when,bounce)
  58 char *addr;
  59 unsigned long when;
  60 stralloc *bounce;
  61 {
  62   int fd;
  63
  64   if (!issub(addr)) return;
  65
  66   if (!stralloc_copys(&fndate,"bounce/w")) die_nomem();
  67   if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,when))) die_nomem();
  68   if (!stralloc_cats(&fndate,".")) die_nomem();
  69   if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,(unsigned long) getpid()))) die_nomem();
  70   if (!stralloc_0(&fndate)) die_nomem();
  71   if (!stralloc_copy(&fndatenew,&fndate)) die_nomem();
  72   fndatenew.s[7] = 'W';
  73
  74   fd = open_trunc(fndatenew.s);
  75   if (fd == -1) die_datenew();
  76   substdio_fdbuf(&ssout,write,fd,outbuf,sizeof(outbuf));
  77   if (substdio_puts(&ssout,addr) == -1) die_datenew();
  78   if (substdio_put(&ssout,"",1) == -1) die_datenew();
  79   if (substdio_puts(&ssout,"Return-Path: <") == -1) die_datenew();
  80   if (!quote2(&quoted,sender)) die_nomem();
  81   if (substdio_put(&ssout,quoted.s,quoted.len) == -1) die_datenew();
  82   if (substdio_puts(&ssout,">\n") == -1) die_datenew();
  83   if (substdio_put(&ssout,bounce->s,bounce->len) == -1) die_datenew();
  84   if (substdio_flush(&ssout) == -1) die_datenew();
  85   if (fsync(fd) == -1) die_datenew();
  86   if (close(fd) == -1) die_datenew(); /* NFS stupidity */
  87
  88   if (rename(fndatenew.s,fndate.s) == -1)
  89     strerr_die6sys(111,FATAL,"unable to rename ",fndatenew.s," to ",fndate.s,": ");
  90 }
  91
  92 void doit(addr,msgnum,when,bounce)
  93 char *addr;
  94 unsigned long msgnum;
  95 unsigned long when;
  96 stralloc *bounce;
  97 {
  98   int fd;
  99   int fdnew;
 100
 101   if (!issub(addr)) return;
 102
 103   if (!stralloc_copys(&fndate,"bounce/d")) die_nomem();
 104   if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,when))) die_nomem();
 105   if (!stralloc_cats(&fndate,".")) die_nomem();
 106   if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,(unsigned long) getpid()))) die_nomem();
 107   if (!stralloc_0(&fndate)) die_nomem();
 108   if (!stralloc_copy(&fndatenew,&fndate)) die_nomem();
 109   fndatenew.s[7] = 'D';
 110
 111   fd = open_trunc(fndatenew.s);
 112   if (fd == -1) die_datenew();
 113   substdio_fdbuf(&ssout,write,fd,outbuf,sizeof(outbuf));
 114   if (substdio_puts(&ssout,addr) == -1) die_datenew();
 115   if (substdio_put(&ssout,"",1) == -1) die_datenew();
 116   if (substdio_puts(&ssout,"Return-Path: <") == -1) die_datenew();
 117   if (!quote2(&quoted,sender)) die_nomem();
 118   if (substdio_put(&ssout,quoted.s,quoted.len) == -1) die_datenew();
 119   if (substdio_puts(&ssout,">\n") == -1) die_datenew();
 120   if (substdio_put(&ssout,bounce->s,bounce->len) == -1) die_datenew();
 121   if (substdio_flush(&ssout) == -1) die_datenew();
 122   if (fsync(fd) == -1) die_datenew();
 123   if (close(fd) == -1) die_datenew(); /* NFS stupidity */
 124
 125   cookie(hash,"",0,"",addr,"");
 126   if (!stralloc_copys(&fnhash,"bounce/h")) die_nomem();
 127   if (!stralloc_catb(&fnhash,hash,COOKIE)) die_nomem();
 128   if (!stralloc_0(&fnhash)) die_nomem();
 129   if (!stralloc_copy(&fnhashnew,&fnhash)) die_nomem();
 130   fnhashnew.s[7] = 'H';
 131
 132   fdnew = open_trunc(fnhashnew.s);
 133   if (fdnew == -1) die_hashnew();
 134   substdio_fdbuf(&ssout,write,fdnew,outbuf,sizeof(outbuf));
 135
 136   fd = open_read(fnhash.s);
 137   if (fd == -1) {
 138     if (errno != error_noent)
 139       strerr_die4sys(111,FATAL,"unable to read ",fnhash.s,": ");
 140     if (rename(fndatenew.s,fndate.s) == -1)
 141       strerr_die6sys(111,FATAL,"unable to rename ",fndatenew.s," to ",fndate.s,": ");
 142   }
 143   else {
 144     substdio_fdbuf(&ssin,read,fd,inbuf,sizeof(inbuf));
 145     switch(substdio_copy(&ssout,&ssin)) {
 146       case -2: die_msgin();
 147       case -3: die_hashnew();
 148     }
 149     close(fd);
 150     if (unlink(fndatenew.s) == -1)
 151       strerr_die4sys(111,FATAL,"unable to unlink ",fndatenew.s,": ");
 152   }
 153   if (substdio_puts(&ssout,"   ") == -1) die_hashnew();
 154   if (substdio_put(&ssout,strnum,fmt_ulong(strnum,msgnum)) == -1) die_hashnew();
 155   if (substdio_puts(&ssout,"\n") == -1) die_hashnew();
 156   if (substdio_flush(&ssout) == -1) die_hashnew();
 157   if (fsync(fdnew) == -1) die_hashnew();
 158   if (close(fdnew) == -1) die_hashnew(); /* NFS stupidity */
 159
 160   if (rename(fnhashnew.s,fnhash.s) == -1)
 161     strerr_die6sys(111,FATAL,"unable to rename ",fnhashnew.s," to ",fnhash.s,": ");
 162 }
 163
 164 stralloc bounce = {0};
 165 stralloc line = {0};
 166 stralloc header = {0};
 167 stralloc intro = {0};
 168 stralloc failure = {0};
 169 stralloc paragraph = {0};
 170 int flaghaveheader;
 171 int flaghaveintro;
 172
 173 stralloc key = {0};
 174 stralloc inhost = {0};
 175 stralloc outhost = {0};
 176 stralloc inlocal = {0};
 177 stralloc outlocal = {0};
 178
 179 char msginbuf[1024];
 180 substdio ssmsgin;
 181
 182 void main(argc,argv)
 183 int argc;
 184 char **argv;
 185 {
 186   char *dir;
 187   char *host;
 188   char *local;
 189   char *action;
 190   unsigned long msgnum;
 191   unsigned long cookiedate;
 192   unsigned long when;
 193   int match;
 194   int i;
 195   int fdlock;
 196
 197   umask(022);
 198   sig_pipeignore();
 199   when = (unsigned long) now();
 200
 201   dir = argv[1];
 202   if (!dir) die_usage();
 203
 204   sender = env_get("SENDER");
 205   if (!sender) strerr_die2x(100,FATAL,"SENDER not set");
 206   local = env_get("LOCAL");
 207   if (!local) strerr_die2x(100,FATAL,"LOCAL not set");
 208   host = env_get("HOST");
 209   if (!host) strerr_die2x(100,FATAL,"HOST not set");
 210
 211   if (chdir(dir) == -1)
 212     strerr_die4sys(111,FATAL,"unable to switch to ",dir,": ");
 213
 214   switch(slurp("key",&key,32)) {
 215     case -1:
 216       strerr_die4sys(111,FATAL,"unable to read ",dir,"/key: ");
 217     case 0:
 218       strerr_die3x(100,FATAL,dir,"/key does not exist");
 219   }
 220   getconf_line(&inhost,"inhost",1,FATAL,dir);
 221   getconf_line(&inlocal,"inlocal",1,FATAL,dir);
 222   getconf_line(&outhost,"outhost",1,FATAL,dir);
 223   getconf_line(&outlocal,"outlocal",1,FATAL,dir);
 224
 225   if (inhost.len != str_len(host)) die_badaddr();
 226   if (case_diffb(inhost.s,inhost.len,host)) die_badaddr();
 227   if (inlocal.len > str_len(local)) die_badaddr();
 228   if (case_diffb(inlocal.s,inlocal.len,local)) die_badaddr();
 229
 230   action = local + inlocal.len;
 231
 232   if (!str_start(action,"-return-")) die_badaddr();
 233   action += 8;
 234
 235   if (!*action) die_trash();
 236
 237   if (str_start(action,"probe-")) {
 238     action += 6;
 239     action += scan_ulong(action,&cookiedate);
 240     if (now() - cookiedate > 3000000) die_trash();
 241     if (*action++ != '.') die_trash();
 242     i = str_chr(action,'-');
 243     if (i != COOKIE) die_trash();
 244     byte_copy(hashcopy,COOKIE,action);
 245     action += COOKIE;
 246     if (*action++ != '-') die_trash();
 247     i = str_rchr(action,'=');
 248     if (!stralloc_copyb(&line,action,i)) die_nomem();
 249     if (action[i]) {
 250       if (!stralloc_cats(&line,"@")) die_nomem();
 251       if (!stralloc_cats(&line,action + i + 1)) die_nomem();
 252     }
 253     if (!stralloc_0(&line)) die_nomem();
 254     strnum[fmt_ulong(strnum,cookiedate)] = 0;
 255     cookie(hash,key.s,key.len,strnum,line.s,"P");
 256     if (byte_diff(hash,COOKIE,hashcopy)) die_trash();
 257
 258     if (subscribe(line.s,0) == 1) log("-probe",line.s);
 259     _exit(0);
 260   }
 261
 262   fdlock = open_append("lockbounce");
 263   if (fdlock == -1)
 264     strerr_die4sys(111,FATAL,"unable to open ",dir,"/lockbounce: ");
 265   if (lock_ex(fdlock) == -1)
 266     strerr_die4sys(111,FATAL,"unable to lock ",dir,"/lockbounce: ");
 267
 268   if (str_start(action,"warn-")) {
 269     action += 5;
 270     action += scan_ulong(action,&cookiedate);
 271     if (now() - cookiedate > 3000000) die_trash();
 272     if (*action++ != '.') die_trash();
 273     i = str_chr(action,'-');
 274     if (i != COOKIE) die_trash();
 275     byte_copy(hashcopy,COOKIE,action);
 276     action += COOKIE;
 277     if (*action++ != '-') die_trash();
 278     i = str_rchr(action,'=');
 279     if (!stralloc_copyb(&line,action,i)) die_nomem();
 280     if (action[i]) {
 281       if (!stralloc_cats(&line,"@")) die_nomem();
 282       if (!stralloc_cats(&line,action + i + 1)) die_nomem();
 283     }
 284     if (!stralloc_0(&line)) die_nomem();
 285     strnum[fmt_ulong(strnum,cookiedate)] = 0;
 286     cookie(hash,key.s,key.len,strnum,line.s,"W");
 287     if (byte_diff(hash,COOKIE,hashcopy)) die_trash();
 288
 289     if (slurpclose(0,&bounce,1024) == -1) die_msgin();
 290     dowit(line.s,when,&bounce);
 291     _exit(0);
 292   }
 293
 294   action += scan_ulong(action,&msgnum);
 295   if (*action != '-') die_badaddr();
 296   ++action;
 297
 298   if (*action) {
 299     if (slurpclose(0,&bounce,1024) == -1) die_msgin();
 300
 301     i = str_rchr(action,'=');
 302     if (!stralloc_copyb(&line,action,i)) die_nomem();
 303     if (action[i]) {
 304       if (!stralloc_cats(&line,"@")) die_nomem();
 305       if (!stralloc_cats(&line,action + i + 1)) die_nomem();
 306     }
 307     if (!stralloc_0(&line)) die_nomem();
 308     doit(line.s,msgnum,when,&bounce);
 309     _exit(0);
 310   }
 311
 312   /* pre-VERP bounce, in QSBMF format */
 313
 314   substdio_fdbuf(&ssmsgin,read,0,msginbuf,sizeof(msginbuf));
 315
 316   flaghaveheader = 0;
 317   flaghaveintro = 0;
 318
 319   for (;;) {
 320     if (!stralloc_copys(&paragraph,"")) die_nomem();
 321     for (;;) {
 322       if (getln(&ssmsgin,&line,&match,'\n') == -1) die_msgin();
 323       if (!match) die_trash();
 324       if (!stralloc_cat(&paragraph,&line)) die_nomem();
 325       if (line.len <= 1) break;
 326     }
 327
 328     if (!flaghaveheader) {
 329       if (!stralloc_copy(&header,&paragraph)) die_nomem();
 330       flaghaveheader = 1;
 331       continue;
 332     }
 333
 334     if (!flaghaveintro) {
 335       if (paragraph.len < 15) die_trash();
 336       if (str_diffn(paragraph.s,"Hi. This is the",15)) die_trash();
 337       if (!stralloc_copy(&intro,&paragraph)) die_nomem();
 338       flaghaveintro = 1;
 339       continue;
 340     }
 341
 342     if (paragraph.s[0] == '-')
 343       break;
 344
 345     if (paragraph.s[0] == '<') {
 346       if (!stralloc_copy(&failure,&paragraph)) die_nomem();
 347
 348       if (!stralloc_copy(&bounce,&header)) die_nomem();
 349       if (!stralloc_cat(&bounce,&intro)) die_nomem();
 350       if (!stralloc_cat(&bounce,&failure)) die_nomem();
 351
 352       i = byte_chr(failure.s,failure.len,'\n');
 353       if (i < 3) die_trash();
 354
 355       if (!stralloc_copyb(&line,failure.s + 1,i - 3)) die_nomem();
 356       if (byte_chr(line.s,line.len,'\0') == line.len) {
 357         if (!stralloc_0(&line)) die_nomem();
 358         doit(line.s,msgnum,when,&bounce);
 359       }
 360     }
 361   }
 362
 363   _exit(0);
 364 }