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

   1 /*$Id: ezmlm-limit.c,v 1.2 1999/10/31 18:58:48 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3
   4 #include <sys/types.h>
   5 #include "stralloc.h"
   6 #include "substdio.h"
   7 #include "readwrite.h"
   8 #include "strerr.h"
   9 #include "sig.h"
  10 #include "lock.h"
  11 #include "getconf.h"
  12 #include "fmt.h"
  13 #include "now.h"
  14 #include "sgetopt.h"
  15 #include "error.h"
  16 #include "errtxt.h"
  17 #include "idx.h"
  18
  19 #define FATAL "ezmlm-limit: fatal: "
  20 #define INFO "ezmlm-limit: info: "
  21
  22 unsigned long deltasecs = LIMSECS;      /* interval to test over (seconds) */
  23 unsigned long deltanum = LIMMSG;        /* max no messages in interval */
  24                                         /* see idx.h. Usually 30 msg/3600 secs*/
  25 int flagd = 0;                          /* =0 create modpost, =1 ignore */
  26                                         /* excess, =2 defer excess */
  27 int flagmod;                            /* list moderated */
  28 int flagloop;
  29 char *fn = TXT_LOOPNUM;
  30
  31 void die_usage()
  32 {
  33   strerr_die1x(100,
  34         "ezmlm-limit: usage: ezmlm-limit [-f file] [-dDF] [-n messages]"
  35         " [-t secs] dir");
  36 }
  37
  38 void die_nomem() { strerr_die2x(111,FATAL,ERR_NOMEM); }
  39
  40 void die_new() { strerr_die4sys(111,FATAL,ERR_WRITE,fn,": "); }
  41
  42 stralloc line = {0};
  43
  44 substdio ssnew;
  45 char newbuf[16];
  46
  47 char strnum[FMT_ULONG];
  48
  49 void main(argc,argv)
  50 int argc;
  51 char **argv;
  52 {
  53   char *dir;
  54   int opt;
  55   unsigned int pos;
  56   unsigned long num, loopnum, when;
  57   unsigned long loopwhen = 0L;
  58   unsigned long numwhen = 0L;
  59   int fd,fdlock;
  60
  61   (void) umask(022);
  62   sig_pipeignore();
  63   when = (unsigned long) now();
  64
  65   while ((opt = getopt(argc,argv,"dDf:Fn:t:")) != opteof)
  66     switch(opt) {
  67       case 'd': flagd = 1; break;
  68       case 'D': flagd = 0; break;
  69       case 'f': if (optarg && *optarg) fn = optarg; break;
  70       case 'F': fn = TXT_LOOPNUM;
  71       case 'n':
  72                 if (optarg)
  73                   scan_ulong(optarg,&deltanum);
  74                 break;
  75       case 't':
  76                 if (optarg)
  77                   scan_ulong(optarg,&deltasecs);
  78                 break;
  79       default:
  80         die_usage();
  81   }
  82
  83   dir = argv[optind++];
  84   if (!dir) die_usage();
  85
  86   if (chdir(dir) == -1)
  87     strerr_die4sys(111,FATAL,ERR_SWITCH,dir,": ");
  88
  89   if (argv[optind])
  90     die_usage();        /* avoid common error of putting options after dir */
  91   if ((flagmod = getconf_line(&line,"modpost",0,FATAL,dir)))
  92     _exit(0);           /* already mod */
  93                         /* lock for num and for writing loopnum */
  94   fdlock = open_append("lock");
  95   if (fdlock == -1)
  96     strerr_die4sys(111,FATAL,ERR_OPEN,dir,"/lock: ");
  97   if (lock_ex(fdlock) == -1)
  98     strerr_die4sys(111,FATAL,ERR_OBTAIN,dir,"/lock: ");
  99
 100   if (!getconf_line(&line,"num",0,FATAL,dir))
 101     _exit(99);                                          /* no msgs */
 102   if(!stralloc_0(&line)) die_nomem();
 103   pos = scan_ulong(line.s,&num);                        /* current msg */
 104   if ((flagloop = getconf_line(&line,fn,0,FATAL,dir))) {
 105     if(!stralloc_0(&line)) die_nomem();
 106     pos = scan_ulong(line.s,&loopnum);                  /* msg when written */
 107     if (line.s[pos] == ':')
 108       scan_ulong(line.s+pos+1,&loopwhen);               /* time written */
 109   }
 110   if (!flagloop || loopwhen + deltasecs < when || loopwhen > when) {
 111                                         /* loopnum too old, bad or not there */
 112       fd = open_trunc(fn);              /* no need to write crash-proof */
 113       if (fd == -1) die_new();
 114       substdio_fdbuf(&ssnew,write,fd,newbuf,sizeof(newbuf));
 115       if (substdio_put(&ssnew,strnum,fmt_ulong(strnum,num)) == -1) die_new();
 116       if (substdio_puts(&ssnew,":") == -1) die_new();
 117       if (substdio_put(&ssnew,strnum,fmt_ulong(strnum,when)) == -1) die_new();
 118       if (substdio_puts(&ssnew,"\n") == -1) die_new();
 119       if (substdio_flush(&ssnew) == -1) die_new();
 120       close(fd);
 121   } else if (num >= loopnum + deltanum) {       /* excess messages */
 122     if (!flagd) {
 123       if ((fd = open_append("modpost")) == -1)  /* create dir/modpost */
 124           strerr_die3sys(111,FATAL,ERR_WRITE,"subpost:");
 125       else {
 126         close(fd);
 127         unlink(fn);
 128         strerr_die2x(0,INFO,ERR_EXCESS_MOD);
 129       }
 130     } else
 131         strerr_die2x(111,FATAL,ERR_EXCESS_DEFER);
 132   }
 133   _exit(0);
 134 }