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

   1 /*$Id: ezmlm-clean.c,v 1.30 1999/05/12 22:15:26 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include "error.h"
   6 #include "stralloc.h"
   7 #include "str.h"
   8 #include "env.h"
   9 #include "sig.h"
  10 #include "slurp.h"
  11 #include "getconf.h"
  12 #include "strerr.h"
  13 #include "byte.h"
  14 #include "getln.h"
  15 #include "case.h"
  16 #include "qmail.h"
  17 #include "substdio.h"
  18 #include "readwrite.h"
  19 #include "seek.h"
  20 #include "quote.h"
  21 #include "datetime.h"
  22 #include "now.h"
  23 #include "date822fmt.h"
  24 #include "direntry.h"
  25 #include "cookie.h"
  26 #include "sgetopt.h"
  27 #include "fmt.h"
  28 #include "errtxt.h"
  29 #include "copy.h"
  30 #include "idx.h"
  31 #include "mime.h"
  32
  33 int flagmime = MOD_MIME;        /* default is message as attachment */
  34 int flagreturn = 1;             /* default return timed-out messages */
  35 char flagcd = '\0';             /* default: no transferencoding */
  36 stralloc fnmsg = {0};
  37
  38 /* When ezmlm-clean is run, messages and message stubs in pending/      */
  39 /* rejected/accepted are erased if they are older than delay hours.     */
  40 /* Timeouts in h for messages. If modtime has a number, it is made to be*/
  41 /* in the range DELAY_MIN..DELAY_MAX. If the number is 0 or there is no */
  42 /* number, DELAY_DEFAULT is used. Messages that are read-only are       */
  43 /* ignored. Messages in 'pending' that have the execute bit set result  */
  44 /* in an informative reply to the poster. Any defects in the message    */
  45 /* format, inability to open the file, etc, result in a maillog entry   */
  46 /* whereafter the message is erased. */
  47
  48 /* The defines are in "idx.h" */
  49
  50 #define FATAL "ezmlm-clean: fatal: "
  51
  52 void die_read()
  53 {
  54   strerr_die4x(111,FATAL,ERR_READ,fnmsg.s,": ");
  55 }
  56
  57 void die_usage()
  58 {
  59   strerr_die1x(100,"ezmlm-clean: usage: ezmlm-clean [-mMrRvV] dir");
  60 }
  61
  62 void die_nomem() { strerr_die2x(111,FATAL,ERR_NOMEM); }
  63
  64 datetime_sec when;
  65 unsigned int older;
  66 struct datetime dt;
  67
  68 char textbuf[1024];
  69 substdio sstext;
  70
  71 struct qmail qq;
  72 int qqwrite(fd,buf,len) int fd; char *buf; unsigned int len;
  73 {
  74   qmail_put(&qq,buf,len);
  75   return len;
  76 }
  77 char qqbuf[1];
  78 substdio ssqq = SUBSTDIO_FDBUF(qqwrite,-1,qqbuf,sizeof(qqbuf));
  79
  80 char *dir;
  81 char strnum[FMT_ULONG];
  82 char date[DATE822FMT];
  83 char boundary[COOKIE];
  84 datetime_sec hashdate;
  85
  86 stralloc outhost = {0};
  87 stralloc outlocal = {0};
  88 stralloc mailinglist = {0};
  89 stralloc listid = {0};
  90 stralloc quoted = {0};
  91 stralloc line = {0};
  92 stralloc modtime = {0};
  93 stralloc to = {0};
  94 stralloc charset = {0};
  95
  96 int flagconf;
  97 int fd;
  98 int match;
  99 unsigned long msgnum = 0;
 100                         /* counter to make message-id unique, since we may */
 101                         /* send out several msgs. This is not bullet-proof.*/
 102                         /* Duplication occurs if we do x>1 msg && another  */
 103                         /* ezmlm started within x seconds, and with the    */
 104                         /* same pid. Very unlikely.                        */
 105
 106 void transferenc()
 107 {
 108         if (flagcd) {
 109           qmail_puts(&qq,"\nContent-Transfer-Encoding: ");
 110           if (flagcd == 'Q')
 111             qmail_puts(&qq,"Quoted-Printable\n\n");
 112           else
 113             qmail_puts(&qq,"base64\n\n");
 114         } else
 115           qmail_puts(&qq,"\n\n");
 116 }
 117 void readconfigs()
 118 /* gets outlocal, outhost, etc. This is done only if there are any timed-out*/
 119 /* messages found, that merit a reply to the author. */
 120 {
 121
 122   getconf_line(&mailinglist,"mailinglist",1,FATAL,dir);
 123   getconf_line(&listid,"listid",0,FATAL,dir);
 124   getconf_line(&outhost,"outhost",1,FATAL,dir);
 125   getconf_line(&outlocal,"outlocal",1,FATAL,dir);
 126   set_cpouthost(&outlocal);
 127   set_cpoutlocal(&outlocal);
 128 }
 129
 130 void sendnotice(d)
 131 char *d;
 132 /* sends file pointed to by d to the address in the return-path of the  */
 133 /* message. */
 134 {
 135   unsigned int x,y;
 136   char *err;
 137
 138       if (!flagconf) {
 139         readconfigs();
 140       }
 141       if (qmail_open(&qq, (stralloc *) 0) == -1)
 142         strerr_die2x(111,FATAL,ERR_QMAIL_QUEUE);
 143
 144       fd = open_read(d);
 145       if (fd == -1)
 146         strerr_die4sys(111,FATAL,ERR_OPEN,d,": ");
 147       substdio_fdbuf(&sstext,read,fd,textbuf,sizeof(textbuf));
 148       if (getln(&sstext,&line,&match,'\n') == -1) die_read();
 149       if (!match) die_read();
 150       if (!case_startb(line.s,line.len,"return-path:")) die_read();
 151       x = 12 + byte_chr(line.s + 12,line.len-12,'<');
 152       y = byte_rchr(line.s + x,line.len-x,'>');
 153       if (x != line.len && x+y != line.len) {
 154         if (!stralloc_copyb(&to,line.s+x+1, y-1)) die_nomem();
 155         if (!stralloc_0(&to)) die_nomem();
 156       } else
 157         die_read();
 158       qmail_puts(&qq,"Mailing-List: ");
 159       qmail_put(&qq,mailinglist.s,mailinglist.len);
 160       qmail_puts(&qq,"\nList-ID: ");
 161       qmail_put(&qq,listid.s,listid.len);
 162       qmail_puts(&qq,"\nDate: ");
 163       datetime_tai(&dt,when);
 164       qmail_put(&qq,date,date822fmt(date,&dt));
 165       qmail_puts(&qq,"Message-ID: <");
 166       if (!stralloc_copyb(&line,strnum,fmt_ulong(strnum,
 167                 (unsigned long) when + msgnum++))) die_nomem();
 168       if (!stralloc_append(&line,".")) die_nomem();
 169       if (!stralloc_catb(&line,strnum,
 170                 fmt_ulong(strnum,(unsigned long) getpid()))) die_nomem();
 171       if (!stralloc_cats(&line,".ezmlm@")) die_nomem();
 172       if (!stralloc_cat(&line,&outhost)) die_nomem();
 173       if (!stralloc_0(&line)) die_nomem();
 174       qmail_puts(&qq,line.s);
 175                 /* "unique" MIME boundary as hash of messageid */
 176       cookie(boundary,"",0,"",line.s,"");
 177       qmail_puts(&qq,">\nFrom: ");
 178       if (!quote(&quoted,&outlocal)) die_nomem();
 179       qmail_put(&qq,quoted.s,quoted.len);
 180       qmail_puts(&qq,"-help@");
 181       qmail_put(&qq,outhost.s,outhost.len);
 182       qmail_puts(&qq,"\nSubject: ");
 183       qmail_puts(&qq,TXT_RETURNED_POST);
 184       qmail_put(&qq,quoted.s,quoted.len);
 185       qmail_puts(&qq,"@");
 186       qmail_put(&qq,outhost.s,outhost.len);
 187       qmail_puts(&qq, "\nTo: ");
 188       qmail_puts(&qq,to.s);
 189       if (flagmime) {
 190         if (getconf_line(&charset,"charset",0,FATAL,dir)) {
 191           if (charset.len >= 2 && charset.s[charset.len - 2] == ':') {
 192             if (charset.s[charset.len - 1] == 'B' ||
 193                 charset.s[charset.len - 1] == 'Q') {
 194               flagcd = charset.s[charset.len - 1];
 195               charset.s[charset.len - 2] = '\0';
 196             }
 197           }
 198         } else
 199           if (!stralloc_copys(&charset,TXT_DEF_CHARSET)) die_nomem();
 200         if (!stralloc_0(&charset)) die_nomem();
 201         qmail_puts(&qq,"\nMIME-Version: 1.0\n");
 202         qmail_puts(&qq,"Content-Type: multipart/mixed;\n\tboundary=");
 203         qmail_put(&qq,boundary,COOKIE);
 204         qmail_puts(&qq,"\n\n--");
 205         qmail_put(&qq,boundary,COOKIE);
 206         qmail_puts(&qq,"\nContent-Type: text/plain; charset=");
 207         qmail_puts(&qq,charset.s);
 208         transferenc();
 209       } else
 210       qmail_puts(&qq,"\n\n");
 211
 212       copy(&qq,"text/top",flagcd,FATAL);
 213       copy(&qq,"text/mod-timeout",flagcd,FATAL);
 214       if (flagcd == 'B') {
 215         encodeB("",0,&line,2,FATAL);
 216         qmail_put(&qq,line.s,line.len);
 217       }
 218
 219       if (flagmime) {
 220         qmail_puts(&qq,"\n--");
 221         qmail_put(&qq,boundary,COOKIE);
 222         qmail_puts(&qq,"\nContent-Type: message/rfc822\n\n");
 223       }
 224
 225       if (seek_begin(fd) == -1)
 226         strerr_die4sys(111,FATAL,ERR_SEEK,d,": ");
 227
 228       substdio_fdbuf(&sstext,read,fd,textbuf,sizeof(textbuf));
 229       if (substdio_copy(&ssqq,&sstext) != 0) die_read();
 230       close (fd);
 231
 232       if (flagmime) {
 233         qmail_puts(&qq,"\n--");
 234         qmail_put(&qq,boundary,COOKIE);
 235         qmail_puts(&qq,"--\n");
 236       }
 237
 238       if (!stralloc_copy(&line,&outlocal)) die_nomem();
 239       if (!stralloc_cats(&line,"-return-@")) die_nomem();
 240       if (!stralloc_cat(&line,&outhost)) die_nomem();
 241       if (!stralloc_0(&line)) die_nomem();
 242       qmail_from(&qq,line.s);           /* sender */
 243         qmail_to(&qq,to.s);
 244
 245      if (*(err = qmail_close(&qq)) != '\0')
 246        strerr_die3x(111,FATAL,ERR_TMP_QMAIL_QUEUE, err + 1);
 247
 248      strnum[fmt_ulong(strnum,qmail_qp(&qq))] = 0;
 249      strerr_warn2("ezmlm-clean: info: qp ",strnum,0);
 250 }
 251
 252 void dodir(dirname,reply)
 253 char *dirname; int reply;
 254 /* parses file names in directory 'dirname'. Files that are not owner */
 255 /* writable (w) are ignored. If the files are older (by name!) than   */
 256 /* now-delay, action is taken:                                        */
 257 /* If the owner x bit is not set, the file is erased.                 */
 258 /* If it is set and reply is not set, the file is erased. If both are */
 259 /* set, a notice about the timeout is sent to the poster. If this     */
 260 /* fails due to a message-related error (format, etc) the file is     */
 261 /* erased even though no notice is sent. For temporary errors (like   */
 262 /* out-of-memory) the message is left intact for the next run. If the */
 263 /* notice is sent successfully, the file is erased. All this is to    */
 264 /* do the best possible without risking a rerun of the .qmail file,   */
 265 /* which could result in a redelivery of the action request and a     */
 266 /* second (incorrect) reply to the moderator's request.               */
 267
 268 /* NOTE: ALL non-hidden files in this dir are processed and merci-    */
 269 /* lessly deleted. No checks for proper file name. E.g. 'HELLO'       */
 270 /* => time 0 => will be deleted on the next ezmlm-clean run.          */
 271 {
 272   DIR *moddir;
 273   direntry *d;
 274   unsigned long modtime;
 275   struct stat st;
 276
 277   moddir = opendir(dirname);
 278   if (!moddir)
 279     strerr_die6sys(0,FATAL,ERR_OPEN,dir,"/",dirname,": ");
 280   while ((d = readdir(moddir))) {
 281     if (d->d_name[0] == '.') continue;
 282     scan_ulong(d->d_name,&modtime);
 283     if (modtime < older) {
 284       if (!stralloc_copys(&fnmsg,dirname)) die_nomem();
 285       if (!stralloc_cats(&fnmsg,d->d_name)) die_nomem();
 286       if (!stralloc_0(&fnmsg)) die_nomem();
 287       if((stat(fnmsg.s,&st) != -1) && (st.st_mode & 0200)) {
 288         if(reply && (st.st_mode & 0100)) {
 289                         /* unlink unless there was a TEMPORARY */
 290                         /* not message-related error notifying */
 291                         /* poster and msg x bit set.  Leave r/o*/
 292                         /* messages alone. Non-x bit msg are   */
 293                         /* trash. Just unlink, don't notify    */
 294           sendnotice(fnmsg.s);
 295           unlink(fnmsg.s);
 296         } else
 297           unlink(fnmsg.s);
 298       }
 299     }
 300   }
 301   closedir(moddir);
 302 }
 303
 304
 305 void main(argc,argv)
 306 int argc;
 307 char **argv;
 308 {
 309   int fdlock;
 310   int delay;
 311   int opt;
 312   (void) umask(022);
 313   sig_pipeignore();
 314   when = now();
 315
 316   while ((opt = getopt(argc,argv,"mMrRvV")) != opteof)
 317     switch(opt) {
 318       case 'm': flagmime = 1; break;
 319       case 'M': flagmime = 0; break;
 320       case 'r': flagreturn = 1; break;
 321       case 'R': flagreturn = 0; break;
 322       case 'v':
 323       case 'V': strerr_die2x(0,"ezmlm-clean version: ", EZIDX_VERSION);
 324                 /* not reached */
 325       default:
 326         die_usage();
 327     }
 328
 329   dir = argv[optind];
 330   if (!dir) die_usage();
 331
 332   if (chdir(dir) == -1)
 333     strerr_die4sys(111,FATAL,ERR_SWITCH,dir,": ");
 334
 335   getconf_line(&modtime,"modtime",0,FATAL,dir);
 336   if (!stralloc_0(&modtime)) die_nomem();
 337   scan_ulong(modtime.s,&delay);
 338   if (!delay) delay = DELAY_DEFAULT;
 339   else if (delay < DELAY_MIN) delay = DELAY_MIN;
 340   else if (delay > DELAY_MAX) delay = DELAY_MAX;
 341   older = (unsigned long) when - 3600L * delay; /* delay is in hours */
 342
 343   fdlock = open_append("mod/lock");
 344   if (fdlock == -1)
 345     strerr_die4sys(0,FATAL,ERR_OPEN,dir,"/mod/lock: ");
 346   if (lock_ex(fdlock) == -1)
 347     strerr_die4sys(0,FATAL,ERR_OBTAIN,dir,"/mod/lock: ");
 348
 349   flagconf = 0;
 350   dodir("mod/pending/",flagreturn);
 351   dodir("mod/accepted/",0);
 352   dodir("mod/rejected/",0);
 353   _exit(0);
 354 }
 355