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

   1 #include "stralloc.h"
   2 #include "str.h"
   3 #include "byte.h"
   4 #include "readwrite.h"
   5 #include "substdio.h"
   6 #include "getln.h"
   7 #include "strerr.h"
   8 #include "errtxt.h"
   9
  10 char buf0[256];
  11 substdio ss0 = SUBSTDIO_FDBUF(read,0,buf0,sizeof(buf0));
  12
  13 #define FATAL "ezmlm-weed: fatal: "
  14
  15 void die_nomem()
  16 {
  17   strerr_die2x(111,FATAL,ERR_NOMEM);
  18 }
  19
  20 void get(sa)
  21 stralloc *sa;
  22 {
  23   int match;
  24   if (getln(&ss0,sa,&match,'\n') == -1)
  25     strerr_die2sys(111,FATAL,ERR_READ_INPUT);
  26   if (!match) _exit(0);
  27 }
  28
  29 stralloc line = {0};
  30 stralloc line1 = {0};
  31 stralloc line2 = {0};
  32 stralloc line3 = {0};
  33 stralloc line4 = {0};
  34 stralloc line5 = {0};
  35 stralloc line6 = {0};
  36 stralloc line7 = {0};
  37 stralloc line8 = {0};
  38
  39 stralloc boundary = {0};
  40 stralloc dsnline = {0};
  41
  42 char warn1[] = "    **********************************************";
  43 char warn2[] = "    **      THIS IS A WARNING MESSAGE ONLY      **";
  44 char warn3[] = "    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **";
  45 char warn4[] = "    **********************************************";
  46
  47 int flagmds = 0;
  48 int flagsw = 0;
  49 int flagsr = 0;
  50 int flagas = 0;
  51 int flagbw = 0;
  52 int flagdsn = 0;
  53
  54 int isboundary()
  55 /* returns 1 if line.len contains the mime bondary, 0 otherwise */
  56 {
  57     if (line.s[0] == '-' && line.s[1] == '-' && line.len >= boundary.len + 3)
  58       if (!byte_diff(line.s + 2,boundary.len,boundary.s))       /* boundary */
  59         return 1;
  60     return 0;
  61 }
  62
  63 void main()
  64 {
  65   unsigned int i,j;
  66
  67   for (;;) {
  68     get(&line);
  69     if (line.len == 1) break;
  70     if (line.s[0] == ' ' || line.s[0] == '\t') {        /* continuation */
  71       if (flagdsn) {
  72         if (!stralloc_catb(&dsnline,line.s,line.len - 1)) die_nomem();
  73         continue;
  74       }
  75     }
  76     flagdsn = 0;
  77     if (stralloc_starts(&line,"Subject: success notice"))
  78       _exit(99);
  79     if (stralloc_starts(&line,"Subject: deferral notice"))
  80       _exit(99);
  81     if (stralloc_starts(&line,"Precedence: bulk"))
  82       _exit(99);
  83     if (stralloc_starts(&line,"Precedence: junk"))
  84       _exit(99);
  85 /* for Novell Groupwise */
  86     if (stralloc_starts(&line,"Subject: Message status - delivered"))
  87       _exit(99);
  88     if (stralloc_starts(&line,"Subject: Message status - opened"))
  89       _exit(99);
  90     if (stralloc_starts(&line,"Subject: Out of Office AutoReply:"))
  91       _exit(99);
  92
  93     if (stralloc_starts(&line,"From: Mail Delivery Subsystem <MAILER-DAEMON@"))
  94       flagmds = 1;
  95     if (stralloc_starts(&line,"Subject: Warning: could not send message"))
  96       flagsw = 1;
  97     if (stralloc_starts(&line,"Subject: Returned mail: warning: cannot send message"))
  98       flagsr = 1;
  99     if (stralloc_starts(&line,"Auto-Submitted: auto-generated (warning"))
 100       flagas = 1;
 101     if (case_startb(line.s,line.len,"Content-type: multipart/report"))
 102       if (!stralloc_copyb(&dsnline,line.s,line.len - 1)) die_nomem();
 103       flagdsn = 1;
 104   }                     /* end of header */
 105
 106   if (flagdsn) {        /* always only one recipient/action */
 107     flagdsn = 0;        /* will be set for correct report type */
 108     for (i=0; i < dsnline.len; i += 1+byte_chr(dsnline.s+i,dsnline.len-i,';')) {
 109       while (dsnline.s[i] == ' ' || dsnline.s[i] == '\t')
 110         if (++i >= dsnline.len) break;
 111       if (case_startb(dsnline.s + i,dsnline.len - i,"report-type=")) {
 112         i += 12;
 113         while (dsnline.s[i] ==' ' || dsnline.s[i] =='\t' || dsnline.s[i] =='"')
 114           if (++i >= dsnline.len) break;
 115         if (case_startb(dsnline.s + i,dsnline.len - i,"delivery-status"))
 116           flagdsn = 1;
 117       } else if (case_startb(dsnline.s + i,dsnline.len - i,"boundary=")) {
 118         i += 9;
 119         while (dsnline.s[i] ==' ' || dsnline.s[i] =='\t')
 120           if (++i >= dsnline.len) break;
 121         if (dsnline.s[i] == '"') {
 122           if (++i >= dsnline.len) break;
 123           j = i + byte_chr(dsnline.s + i,dsnline.len - i,'"');
 124           if (j >= dsnline.len) break;
 125         } else {
 126           j = i;
 127           while (dsnline.s[j] !=' ' && dsnline.s[j] !='\t' &&
 128                 dsnline.s[j] !=';')
 129             if (++j >= dsnline.len) break;
 130         }                               /* got boundary */
 131         if (!stralloc_copyb(&boundary,dsnline.s+i,j-i)) die_nomem();
 132       }
 133     }
 134   }
 135   if (flagdsn && boundary.len) {        /* parse DSN message */
 136     get(&line);                 /* if bad format we exit(0) via get() */
 137     for (;;) {
 138       if (isboundary()) {
 139       if (line.len == boundary.len + 5 && line.s[line.len - 1] == '-'
 140                 && line.s[line.len - 2] == '-')
 141         _exit(99);                      /* end: not failure report */
 142         get(&line);                     /* Content-type */
 143         if (case_startb(line.s,line.len,"content-type:")) {
 144           i = 13;
 145           while (line.s[i] == ' ' || line.s[i] == '\t')
 146                 if (++i >= line.len) break;
 147           if (case_startb(line.s+i,line.len-i,"message/delivery-status")) {
 148             for (;;) {
 149               get(&line);
 150               if (isboundary()) break;
 151               if (case_startb(line.s,line.len,"action:")) {
 152                 i = 8;
 153                 while (line.s[i] == ' ' || line.s[i] == '\t')
 154                   if (++i >= line.len) break;
 155                 if (case_startb(line.s + i, line.len - i,"failed"))
 156                   _exit(0);     /* failure notice */
 157                 else
 158                   _exit(99);    /* there shouldn't be more than 1 action */
 159               }
 160             }
 161           }
 162         }
 163       } else
 164         get(&line);
 165     }
 166   }
 167
 168   get(&line1);
 169   get(&line2);
 170   get(&line3);
 171   get(&line4);
 172   get(&line5);
 173   get(&line6);
 174   get(&line7);
 175   get(&line8);
 176
 177   if (stralloc_starts(&line1,"This is a MIME-encapsulated message"))
 178   if (stralloc_starts(&line3,"--"))
 179   if (stralloc_starts(&line5,warn1))
 180   if (stralloc_starts(&line6,warn2))
 181   if (stralloc_starts(&line7,warn3))
 182   if (stralloc_starts(&line8,warn4))
 183     flagbw = 1;
 184
 185   if (stralloc_starts(&line1,warn1))
 186   if (stralloc_starts(&line2,warn2))
 187   if (stralloc_starts(&line3,warn3))
 188   if (stralloc_starts(&line4,warn4))
 189     flagbw = 1;
 190
 191   if (flagmds && flagsw && flagas && flagbw) _exit(99);
 192   if (flagmds && flagsr && flagbw) _exit(99);
 193
 194   _exit(0);
 195 }