mdw@git.distorted.org.uk Git - qmail/blob - qlist.c

   1 #include "sig.h"
   2 #include "readwrite.h"
   3 #include "substdio.h"
   4 #include "stralloc.h"
   5 #include "subfd.h"
   6 #include "getln.h"
   7 #include "alloc.h"
   8 #include "str.h"
   9 #include "env.h"
  10 #include "hfield.h"
  11 #include "case.h"
  12 #include "token822.h"
  13 #include "error.h"
  14 #include "gen_alloc.h"
  15 #include "gen_allocdefs.h"
  16 #include "headerbody.h"
  17 #include "exit.h"
  18 #include "open.h"
  19 #include "lock.h"
  20 #include "qmail.h"
  21
  22 #define ADDRLIMIT 100
  23
  24 void die() { _exit(100); }
  25 void die_temp() { _exit(111); }
  26 void die_nomem() {
  27  substdio_putsflush(subfderr,"qlist: fatal: out of memory\n"); die_temp(); }
  28 void die_fork() {
  29  substdio_putsflush(subfderr,"qlist: fatal: unable to fork\n"); die_temp(); }
  30 void die_nolock() {
  31  substdio_putsflush(subfderr,"qlist: fatal: unable to open lock file\n"); die_temp(); }
  32 void die_boing() {
  33  substdio_putsflush(subfderr,"qlist: fatal: I don't reply to bounces\n"); die(); }
  34 void die_badaddr() {
  35  substdio_putsflush(subfderr,"qlist: fatal: sorry, I'm not allowed to use that address\n"); die(); }
  36 void die_qqperm() {
  37  substdio_putsflush(subfderr,"qlist: fatal: permanent qmail-queue error\n"); die(); }
  38 void die_qqtemp() {
  39  substdio_putsflush(subfderr,"qlist: fatal: temporary qmail-queue error\n"); die_temp(); }
  40 void die_usage() {
  41  substdio_putsflush(subfderr,
  42  "qlist: usage: qlist user-list@host user-list-request@host .qmail-list .qmail-list-request .qtemp-list owner [moreinfo]\n"); die(); }
  43 void die_read() {
  44  if (errno == error_nomem) die_nomem();
  45  substdio_putsflush(subfderr,"qlist: fatal: read error\n"); die_temp(); }
  46 void doordie(sa,r) stralloc *sa; int r; {
  47  if (r == 1) return; if (r == -1) die_nomem();
  48  substdio_putsflush(subfderr,"qlist: fatal: unable to parse this: ");
  49  substdio_putflush(subfderr,sa->s,sa->len); die(); }
  50
  51 int subjectaction = 0;
  52 int numcommands;
  53
  54 int fdlock;
  55
  56 struct qmail qqt;
  57
  58 char *target;
  59 char *listathost;
  60 char *requestathost;
  61 char *qmaillist;
  62 char *qmailrequest;
  63 char *qtemplist;
  64 char *owner;
  65 char *moreinfo;
  66
  67 char *dtline;
  68 char *returnpath;
  69 stralloc safrom = {0};
  70 stralloc sart = {0};
  71
  72 int rwfrom(addr) token822_alloc *addr; { token822_reverse(addr);
  73  if (token822_unquote(&safrom,addr) != 1) die_nomem();
  74  token822_reverse(addr); return 1; }
  75 int rwrt(addr) token822_alloc *addr; { token822_reverse(addr);
  76  if (token822_unquote(&sart,addr) != 1) die_nomem();
  77  token822_reverse(addr); return 1; }
  78
  79 GEN_ALLOC_typedef(saa,stralloc,sa,len,a)
  80 GEN_ALLOC_readyplus(saa,stralloc,sa,len,a,i,n,x,10,saa_readyplus)
  81 static stralloc sauninit = {0}; saa savedh = {0};
  82 void savedh_append(h) stralloc *h; {
  83  if (!saa_readyplus(&savedh,1)) die_nomem(); savedh.sa[savedh.len] = sauninit;
  84  if (!stralloc_copy(savedh.sa + savedh.len,h)) die_nomem(); ++savedh.len; }
  85 void savedh_print() { int i; for (i = 0;i < savedh.len;++i)
  86  qmail_put(&qqt,savedh.sa[i].s,savedh.sa[i].len); }
  87
  88 void finishheader()
  89 {
  90  int i;
  91
  92  if (sart.s)
  93   { if (!stralloc_0(&sart)) die_nomem(); target = sart.s; }
  94  else if (safrom.s)
  95   { if (!stralloc_0(&safrom)) die_nomem(); target = safrom.s; }
  96  else
  97    target = returnpath;
  98
  99  for (i = 0;target[i];++i)
 100    if (target[i] == '\n')
 101      die_badaddr();
 102  if (i > ADDRLIMIT) die_badaddr();
 103  if (str_equal(target,"")) die_boing();
 104  if (str_equal(target,"#@[]")) die_boing();
 105
 106  if (qmail_open(&qqt) == -1) die_fork();
 107
 108  qmail_puts(&qqt,dtline);
 109  savedh_print();
 110
 111  qmail_puts(&qqt,"\n***** Text inserted by ");
 112  qmail_puts(&qqt,requestathost);
 113  qmail_puts(&qqt,"\n\
 114 *\n\
 115 * Hi! This is the qlist program. I'm handling subscriptions for the\n\
 116 * ");
 117  qmail_puts(&qqt,listathost);
 118  qmail_puts(&qqt," mailing list.\n\
 119 *\n");
 120  if (moreinfo)
 121   {
 122    qmail_puts(&qqt,"* ");
 123    qmail_puts(&qqt,moreinfo);
 124    qmail_puts(&qqt,"\n*\n");
 125   }
 126  qmail_puts(&qqt,"* My human owner is ");
 127  qmail_puts(&qqt,owner);
 128  qmail_puts(&qqt,".\n\
 129 *\n\
 130 * To the recipient: This message was sent to me on your behalf. (Your\n\
 131 * address was listed in the Reply-To or From field.) For security,\n\
 132 * I'm forwarding this message to you, along with my notes.\n\
 133 *\n\
 134 * Anyway, to subscribe, send me an empty message. To unsubscribe, send me\n\
 135 * a message with the word UNSUBSCRIBE at the beginning of a line. Remember,\n\
 136 * my address is ");
 137  qmail_puts(&qqt,requestathost);
 138  qmail_puts(&qqt,".\n\
 139 *\n\
 140 * Now I'll look for requests inside this message...\n\
 141 *\n\
 142 *****\n");
 143 }
 144
 145 substdio subin; char subinbuf[SUBSTDIO_INSIZE];
 146 substdio subout; char suboutbuf[SUBSTDIO_OUTSIZE];
 147 stralloc subline = {0};
 148 void subscribe(flagadd)
 149 int flagadd;
 150 {
 151  int fdin;
 152  int fdout;
 153  int match;
 154  int flagwasthere;
 155
 156  ++numcommands;
 157
 158  if (lock_ex(fdlock) == -1) goto bad;
 159  fdin = open_read(qmaillist);
 160  if (fdin == -1) goto badlock;
 161  fdout = open_trunc(qtemplist);
 162  if (fdout == -1) goto badinlock;
 163  if (chmod(qtemplist,0700) == -1) goto badoutinlock;
 164
 165  flagwasthere = 0;
 166
 167  substdio_fdbuf(&subin,read,fdin,subinbuf,sizeof(subinbuf));
 168  substdio_fdbuf(&subout,write,fdout,suboutbuf,sizeof(suboutbuf));
 169  for (;;)
 170   {
 171    if (getln(&subin,&subline,&match,'\n') == -1) goto badoutinlock;
 172    if (!match) break; /* goodbye partial lines */
 173    if (subline.len == str_len(target) + 2)
 174      if (!str_diffn(subline.s + 1,target,subline.len - 2))
 175        if (subline.s[0] == '&')
 176         {
 177          flagwasthere = 1;
 178          if (!flagadd)
 179            continue;
 180         }
 181    if (substdio_put(&subout,subline.s,subline.len) == -1) goto badoutinlock;
 182   }
 183
 184  if (flagadd && !flagwasthere)
 185   {
 186    if (substdio_puts(&subout,"&") == -1) goto badoutinlock;
 187    if (substdio_puts(&subout,target) == -1) goto badoutinlock;
 188    if (substdio_puts(&subout,"\n") == -1) goto badoutinlock;
 189   }
 190  if (substdio_flush(&subout) == -1) goto badoutinlock;
 191
 192  close(fdout);
 193  close(fdin);
 194  if (rename(qtemplist,qmaillist) == -1) goto badlock;
 195  if (chmod(qmaillist,0500) == -1) goto badlock;
 196
 197  lock_un(fdlock);
 198
 199  qmail_puts(&qqt,"***** Text inserted by ");
 200  qmail_puts(&qqt,requestathost);
 201  qmail_puts(&qqt,"\n*\n* ");
 202  if (flagadd)
 203    if (flagwasthere)
 204     {
 205      qmail_puts(&qqt,"Acknowledgment: ");
 206      qmail_puts(&qqt,target);
 207      qmail_puts(&qqt," was already a subscriber.\n");
 208     }
 209    else
 210     {
 211      qmail_puts(&qqt,"Acknowledgment: ");
 212      qmail_puts(&qqt,target);
 213      qmail_puts(&qqt," is now a subscriber.\n");
 214     }
 215  else
 216    if (flagwasthere)
 217     {
 218      qmail_puts(&qqt,"Acknowledgment: ");
 219      qmail_puts(&qqt,target);
 220      qmail_puts(&qqt," is no longer a subscriber.\n");
 221     }
 222    else
 223     {
 224      qmail_puts(&qqt,"Hmmm, I don't see ");
 225      qmail_puts(&qqt,target);
 226      qmail_puts(&qqt," on the subscription list.\n* I'll let my owner know.\n");
 227     }
 228  qmail_puts(&qqt,"*\n*****\n");
 229  return;
 230
 231 badoutinlock: close(fdout);
 232 badinlock: close(fdin);
 233 badlock: lock_un(fdlock);
 234 bad:
 235  qmail_puts(&qqt,"***** Text inserted by ");
 236  qmail_puts(&qqt,requestathost);
 237  qmail_puts(&qqt,"\n*\n\
 238 * Oh no! Trouble making the new list. I'll let my owner know.\n\
 239 *\n\
 240 *****\n");
 241 }
 242
 243 void dobody(h) stralloc *h;
 244 {
 245  qmail_put(&qqt,h->s,h->len);
 246  if (case_starts(h->s,"subs")) subscribe(1);
 247  if (case_starts(h->s,"unsu")) subscribe(0);
 248 }
 249
 250 stralloc hfbuf = {0};
 251 token822_alloc hfin = {0};
 252 token822_alloc hfrewrite = {0};
 253 token822_alloc hfaddr = {0};
 254
 255 void doheaderfield(h)
 256 stralloc *h;
 257 {
 258  char *x;
 259  switch(hfield_known(h->s,h->len))
 260   {
 261    case H_CONTENTLENGTH: /* SVR4 silliness */
 262    case H_CONTENTTYPE:
 263    case H_CONTENTTRANSFERENCODING: /* A-bombs 4.2.1.5.2 is idiotic */
 264      return;
 265    case H_FROM:
 266      doordie(h,token822_parse(&hfin,h,&hfbuf));
 267      doordie(h,token822_addrlist(&hfrewrite,&hfaddr,&hfin,rwfrom));
 268      break;
 269    case H_REPLYTO:
 270      doordie(h,token822_parse(&hfin,h,&hfbuf));
 271      doordie(h,token822_addrlist(&hfrewrite,&hfaddr,&hfin,rwrt));
 272      break;
 273    case H_SUBJECT:
 274      x = h->s + hfield_skipname(h->s,h->len);
 275      if (!case_diffb(x,4,"subs")) subjectaction = 1;
 276      if (!case_diffb(x,4,"unsu")) subjectaction = 2;
 277      break;
 278   }
 279  savedh_append(h);
 280 }
 281
 282 void main(argc,argv)
 283 int argc;
 284 char **argv;
 285 {
 286  sig_pipeignore();
 287
 288  if (!(listathost = argv[1])) die_usage();
 289  if (!(requestathost = argv[2])) die_usage();
 290  if (!(qmaillist = argv[3])) die_usage();
 291  if (!(qmailrequest = argv[4])) die_usage();
 292  if (!(qtemplist = argv[5])) die_usage();
 293  if (!(owner = argv[6])) die_usage();
 294  moreinfo = argv[7];
 295  if (!(returnpath = env_get("NEWSENDER"))) die_usage();
 296  if (!(dtline = env_get("DTLINE"))) die_usage();
 297
 298  fdlock = open_append(qmailrequest);
 299  if (fdlock == -1) die_nolock();
 300
 301  numcommands = 0;
 302  if (headerbody(subfdin,doheaderfield,finishheader,dobody) == -1) die_read();
 303  if (!numcommands)
 304   {
 305    qmail_puts(&qqt,"***** Text inserted by ");
 306    qmail_puts(&qqt,requestathost);
 307    qmail_puts(&qqt,"\n*\n* ");
 308    if (subjectaction)
 309     {
 310      qmail_puts(&qqt,"\
 311 Hmmm, no commands? Let me check the Subject line...\n*\n*****\n");
 312      subscribe(subjectaction == 1);
 313     }
 314    else
 315     {
 316      qmail_puts(&qqt,"\
 317 I didn't see any commands. I presume this is a subscription request.\n\
 318 *\n*****\n");
 319      subscribe(1);
 320     }
 321   }
 322
 323  qmail_from(&qqt,returnpath);
 324  qmail_to(&qqt,owner);
 325  qmail_to(&qqt,target);
 326
 327  switch(qmail_close(&qqt))
 328   {
 329    case 0: _exit(0);
 330    case QMAIL_TOOLONG: die_qqperm();
 331    default: die_qqtemp();
 332   }
 333 }