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

   1 #include <sys/types.h>
   2 #include <sys/stat.h>
   3 #include "readwrite.h"
   4 #include "sig.h"
   5 #include "exit.h"
   6 #include "open.h"
   7 #include "seek.h"
   8 #include "fmt.h"
   9 #include "alloc.h"
  10 #include "substdio.h"
  11 #include "datetime.h"
  12 #include "now.h"
  13 #include "triggerpull.h"
  14 #include "extra.h"
  15 #include "auto_qmail.h"
  16 #include "auto_uids.h"
  17 #include "date822fmt.h"
  18 #include "fmtqfn.h"
  19
  20 #define DEATH 86400 /* 24 hours; _must_ be below q-s's OSSIFIED (36 hours) */
  21 #define ADDR 1003
  22
  23 char inbuf[2048];
  24 struct substdio ssin;
  25 char outbuf[256];
  26 struct substdio ssout;
  27
  28 datetime_sec starttime;
  29 struct datetime dt;
  30 unsigned long mypid;
  31 unsigned long uid;
  32 char *pidfn;
  33 struct stat pidst;
  34 unsigned long messnum;
  35 char *messfn;
  36 char *todofn;
  37 char *intdfn;
  38 int messfd;
  39 int intdfd;
  40 int flagmademess = 0;
  41 int flagmadeintd = 0;
  42
  43 void cleanup()
  44 {
  45  if (flagmadeintd)
  46   {
  47    seek_trunc(intdfd,0);
  48    if (unlink(intdfn) == -1) return;
  49   }
  50  if (flagmademess)
  51   {
  52    seek_trunc(messfd,0);
  53    if (unlink(messfn) == -1) return;
  54   }
  55 }
  56
  57 void die(e) int e; { _exit(e); }
  58 void die_write() { cleanup(); die(53); }
  59 void die_read() { cleanup(); die(54); }
  60 void sigalrm() { /* thou shalt not clean up here */ die(52); }
  61 void sigbug() { die(81); }
  62
  63 unsigned int receivedlen;
  64 char *received;
  65 /* "Received: (qmail-queue invoked by alias); 26 Sep 1995 04:46:54 -0000\n" */
  66
  67 static unsigned int receivedfmt(s)
  68 char *s;
  69 {
  70  unsigned int i;
  71  unsigned int len;
  72  len = 0;
  73  i = fmt_str(s,"Received: (qmail "); len += i; if (s) s += i;
  74  i = fmt_ulong(s,mypid); len += i; if (s) s += i;
  75  i = fmt_str(s," invoked "); len += i; if (s) s += i;
  76  if (uid == auto_uida)
  77   { i = fmt_str(s,"by alias"); len += i; if (s) s += i; }
  78  else if (uid == auto_uidd)
  79   { i = fmt_str(s,"from network"); len += i; if (s) s += i; }
  80  else if (uid == auto_uids)
  81   { i = fmt_str(s,"for bounce"); len += i; if (s) s += i; }
  82  else
  83   {
  84    i = fmt_str(s,"by uid "); len += i; if (s) s += i;
  85    i = fmt_ulong(s,uid); len += i; if (s) s += i;
  86   }
  87  i = fmt_str(s,"); "); len += i; if (s) s += i;
  88  i = date822fmt(s,&dt); len += i; if (s) s += i;
  89  return len;
  90 }
  91
  92 void received_setup()
  93 {
  94  receivedlen = receivedfmt((char *) 0);
  95  received = alloc(receivedlen + 1);
  96  if (!received) die(51);
  97  receivedfmt(received);
  98 }
  99
 100 unsigned int pidfmt(s,seq)
 101 char *s;
 102 unsigned long seq;
 103 {
 104  unsigned int i;
 105  unsigned int len;
 106
 107  len = 0;
 108  i = fmt_str(s,"pid/"); len += i; if (s) s += i;
 109  i = fmt_ulong(s,mypid); len += i; if (s) s += i;
 110  i = fmt_str(s,"."); len += i; if (s) s += i;
 111  i = fmt_ulong(s,starttime); len += i; if (s) s += i;
 112  i = fmt_str(s,"."); len += i; if (s) s += i;
 113  i = fmt_ulong(s,seq); len += i; if (s) s += i;
 114  ++len; if (s) *s++ = 0;
 115
 116  return len;
 117 }
 118
 119 char *fnnum(dirslash,flagsplit)
 120 char *dirslash;
 121 int flagsplit;
 122 {
 123  char *s;
 124
 125  s = alloc(fmtqfn((char *) 0,dirslash,messnum,flagsplit));
 126  if (!s) die(51);
 127  fmtqfn(s,dirslash,messnum,flagsplit);
 128  return s;
 129 }
 130
 131 void pidopen()
 132 {
 133  unsigned int len;
 134  unsigned long seq;
 135
 136  seq = 1;
 137  len = pidfmt((char *) 0,seq);
 138  pidfn = alloc(len);
 139  if (!pidfn) die(51);
 140
 141  for (seq = 1;seq < 10;++seq)
 142   {
 143    if (pidfmt((char *) 0,seq) > len) die(81); /* paranoia */
 144    pidfmt(pidfn,seq);
 145    messfd = open_excl(pidfn);
 146    if (messfd != -1) return;
 147   }
 148
 149  die(63);
 150 }
 151
 152 char tmp[FMT_ULONG];
 153
 154 void main()
 155 {
 156  unsigned int len;
 157  char ch;
 158
 159  sig_blocknone();
 160  umask(033);
 161  if (chdir(auto_qmail) == -1) die(61);
 162  if (chdir("queue") == -1) die(62);
 163
 164  mypid = getpid();
 165  uid = getuid();
 166  starttime = now();
 167  datetime_tai(&dt,starttime);
 168
 169  received_setup();
 170
 171  sig_pipeignore();
 172  sig_miscignore();
 173  sig_alarmcatch(sigalrm);
 174  sig_bugcatch(sigbug);
 175
 176  alarm(DEATH);
 177
 178  pidopen();
 179  if (fstat(messfd,&pidst) == -1) die(63);
 180
 181  messnum = pidst.st_ino;
 182  messfn = fnnum("mess/",1);
 183  todofn = fnnum("todo/",0);
 184  intdfn = fnnum("intd/",0);
 185
 186  if (link(pidfn,messfn) == -1) die(64);
 187  if (unlink(pidfn) == -1) die(63);
 188  flagmademess = 1;
 189
 190  substdio_fdbuf(&ssout,write,messfd,outbuf,sizeof(outbuf));
 191  substdio_fdbuf(&ssin,read,0,inbuf,sizeof(inbuf));
 192
 193  if (substdio_bput(&ssout,received,receivedlen) == -1) die_write();
 194
 195  switch(substdio_copy(&ssout,&ssin))
 196   {
 197    case -2: die_read();
 198    case -3: die_write();
 199   }
 200
 201  if (substdio_flush(&ssout) == -1) die_write();
 202  if (fsync(messfd) == -1) die_write();
 203
 204  intdfd = open_excl(intdfn);
 205  if (intdfd == -1) die(65);
 206  flagmadeintd = 1;
 207
 208  substdio_fdbuf(&ssout,write,intdfd,outbuf,sizeof(outbuf));
 209  substdio_fdbuf(&ssin,read,1,inbuf,sizeof(inbuf));
 210
 211  if (substdio_bput(&ssout,"u",1) == -1) die_write();
 212  if (substdio_bput(&ssout,tmp,fmt_ulong(tmp,uid)) == -1) die_write();
 213  if (substdio_bput(&ssout,"",1) == -1) die_write();
 214
 215  if (substdio_bput(&ssout,"p",1) == -1) die_write();
 216  if (substdio_bput(&ssout,tmp,fmt_ulong(tmp,mypid)) == -1) die_write();
 217  if (substdio_bput(&ssout,"",1) == -1) die_write();
 218
 219  if (substdio_get(&ssin,&ch,1) < 1) die_read();
 220  if (ch != 'F') die(91);
 221  if (substdio_bput(&ssout,&ch,1) == -1) die_write();
 222  for (len = 0;len < ADDR;++len)
 223   {
 224    if (substdio_get(&ssin,&ch,1) < 1) die_read();
 225    if (substdio_put(&ssout,&ch,1) == -1) die_write();
 226    if (!ch) break;
 227   }
 228  if (len >= ADDR) die(11);
 229
 230  if (substdio_bput(&ssout,QUEUE_EXTRA,QUEUE_EXTRALEN) == -1) die_write();
 231
 232  for (;;)
 233   {
 234    if (substdio_get(&ssin,&ch,1) < 1) die_read();
 235    if (!ch) break;
 236    if (ch != 'T') die(91);
 237    if (substdio_bput(&ssout,&ch,1) == -1) die_write();
 238    for (len = 0;len < ADDR;++len)
 239     {
 240      if (substdio_get(&ssin,&ch,1) < 1) die_read();
 241      if (substdio_bput(&ssout,&ch,1) == -1) die_write();
 242      if (!ch) break;
 243     }
 244    if (len >= ADDR) die(11);
 245   }
 246
 247  if (substdio_flush(&ssout) == -1) die_write();
 248  if (fsync(intdfd) == -1) die_write();
 249
 250  if (link(intdfn,todofn) == -1) die(66);
 251
 252  triggerpull();
 253  die(0);
 254 }