pith/maillist.c

   1 #if !defined(lint) && !defined(DOS)
   2 static char rcsid[] = "$Id: maillist.c 769 2007-10-24 00:15:40Z hubert@u.washington.edu $";
   3 #endif
   4
   5 /*
   6  * ========================================================================
   7  * Copyright 2006-2007 University of Washington
   8  * Copyright 2013-2017 Eduardo Chappa
   9  *
  10  * Licensed under the Apache License, Version 2.0 (the "License");
  11  * you may not use this file except in compliance with the License.
  12  * You may obtain a copy of the License at
  13  *
  14  *     http://www.apache.org/licenses/LICENSE-2.0
  15  *
  16  * ========================================================================
  17  */
  18
  19 /*
  20  *  * * * * * * * *      RFC 2369 support routines      * * * * * * * *
  21  */
  22
  23
  24 #include "../pith/headers.h"
  25 #include "../pith/maillist.h"
  26 #include "../pith/state.h"
  27 #include "../pith/url.h"
  28
  29
  30 /*
  31  * Internal prototypes
  32  */
  33 int         rfc2369_parse(char *, RFC2369_S *);
  34
  35 /*
  36  * * NOTE * These have to remain in sync with the MLCMD_* macros
  37  *          in maillist.h.  Sorry.
  38  */
  39 static RFC2369FIELD_S rfc2369_fields[] = {
  40     {"List-Help",
  41      "get information about the list and instructions on how to join",
  42      "seek help"},
  43     {"List-Unsubscribe",
  44      "remove yourself from the list (Unsubscribe)",
  45      "UNsubscribe"},
  46     {"List-Subscribe",
  47      "add yourself to the list (Subscribe)",
  48      "Subscribe"},
  49     {"List-Post",
  50      "send a message to the entire list (Post)",
  51      "post a message"},
  52     {"List-Owner",
  53      "send a message to the list owner",
  54      "contact the list owner"},
  55     {"List-Archive",
  56      "view archive of messages sent to the list",
  57      "view the archive"}
  58 };
  59
  60
  61 char **
  62 rfc2369_hdrs(char **hdrs)
  63 {
  64     int i;
  65
  66     for(i = 0; i < MLCMD_COUNT; i++)
  67       hdrs[i] = rfc2369_fields[i].name;
  68
  69     hdrs[i] = NULL;
  70     return(hdrs);
  71 }
  72
  73
  74 int
  75 rfc2369_parse_fields(char *h, RFC2369_S *data)
  76 {
  77     char *ep, *nhp, *tp;
  78     int   i, rv = FALSE;
  79
  80     for(i = 0; i < MLCMD_COUNT; i++)
  81       data[i].field = rfc2369_fields[i];
  82
  83     for(nhp = h; h; h = nhp){
  84         /* coerce h to start of field */
  85         for(ep = h;;)
  86           if((tp = strpbrk(ep, "\015\012")) != NULL){
  87               if(strindex(" \t", *((ep = tp) + 2))){
  88                   *ep++ = ' ';          /* flatten continuation */
  89                   *ep++ = ' ';
  90                   for(; *ep; ep++)      /* advance past whitespace */
  91                     if(*ep == '\t')
  92                       *ep = ' ';
  93                     else if(*ep != ' ')
  94                       break;
  95               }
  96               else{
  97                   *ep = '\0';           /* tie off header data */
  98                   nhp = ep + 2;         /* start of next header */
  99                   break;
 100               }
 101           }
 102           else{
 103               while(*ep)                /* find the end of this line */
 104                 ep++;
 105
 106               nhp = NULL;               /* no more header fields */
 107               break;
 108           }
 109
 110         /* if length is within reason, see if we're interested */
 111         if(ep - h < MLCMD_REASON && rfc2369_parse(h, data))
 112           rv = TRUE;
 113     }
 114
 115     return(rv);
 116 }
 117
 118
 119 int
 120 rfc2369_parse(char *h, RFC2369_S *data)
 121 {
 122     int   l, ifield, idata = 0;
 123     char *p, *p1, *url, *comment;
 124
 125     /* look for interesting name's */
 126     for(ifield = 0; ifield < MLCMD_COUNT; ifield++)
 127       if(!struncmp(h, rfc2369_fields[ifield].name,
 128                    l = strlen(rfc2369_fields[ifield].name))
 129          && *(h += l) == ':'){
 130           /* unwrap any transport encodings */
 131           if((p = (char *) rfc1522_decode_to_utf8((unsigned char *) tmp_20k_buf,
 132                                                   SIZEOF_20KBUF, ++h)) == tmp_20k_buf)
 133             strcpy(h, p);               /* assumption #383: decoding shrinks */
 134
 135           url = comment = NULL;
 136           while(*h){
 137               while(*h == ' ')
 138                 h++;
 139
 140               switch(*h){
 141                 case '<' :              /* URL */
 142                   if((p = strindex(h, '>')) != NULL){
 143                       url = ++h;        /* remember where it starts */
 144                       *p = '\0';        /* tie it off */
 145                       h  = p + 1;       /* advance h */
 146                       for(p = p1 = url; (*p1 = *p) != '\0'; p++)
 147                         if(*p1 != ' ')
 148                           p1++;         /* remove whitespace ala RFC */
 149                   }
 150                   else
 151                     *h = '\0';          /* tie off junk */
 152
 153                   break;
 154
 155                 case '(' :                      /* Comment */
 156                   comment = rfc822_skip_comment(&h, LONGT);
 157                   break;
 158
 159                 case 'N' :                      /* special case? */
 160                 case 'n' :
 161                   if(ifield == MLCMD_POST
 162                      && (*(h+1) == 'O' || *(h+1) == 'o')
 163                      && (!*(h+2) || *(h+2) == ' ')){
 164                       ;                 /* yup! */
 165
 166                       url = h;
 167                       *(h + 2) = '\0';
 168                       h += 3;
 169                       break;
 170                   }
 171
 172                 default :
 173                   removing_trailing_white_space(h);
 174                   if(!url
 175                      && (url = rfc1738_scan(h, &l))
 176                      && url == h && l == strlen(h)){
 177                       removing_trailing_white_space(h);
 178                       data[ifield].data[idata].value = url;
 179                   }
 180                   else
 181                     data[ifield].data[idata].error = h;
 182
 183                   return(1);            /* return junk */
 184               }
 185
 186               while(*h == ' ')
 187                 h++;
 188
 189               switch(*h){
 190                 case ',' :
 191                   h++;
 192
 193                 case '\0':
 194                   if(url || (comment && *comment)){
 195                       data[ifield].data[idata].value = url;
 196                       data[ifield].data[idata].comment = comment;
 197                       url = comment = NULL;
 198                   }
 199
 200                   if(++idata == MLCMD_MAXDATA)
 201                     *h = '\0';
 202
 203                 default :
 204                   break;
 205               }
 206           }
 207       }
 208
 209     return(idata);
 210 }