src/utils/mail.c

   1 #include <string.h>
   2 #include <time.h>
   3
   4 #include "rfc822.h"
   5 #include "rfc5322.h"
   6
   7 #include "md5_utils.h"
   8
   9 #include "mime.h"
  10
  11 #include "mail.h"
  12
  13 void init_mail_header(struct mail_header *hdr)
  14 {
  15         memset(hdr->from, 0, sizeof(hdr->from));
  16         memset(hdr->subject, 0, sizeof(hdr->subject));
  17
  18         hdr->body_offset = 0L;
  19
  20         /* MIME */
  21         /* [RFC2045]
  22          * If no Content-Type header field is specified, default to:
  23          * Content-type: text/plain; charset=us-ascii
  24          */
  25         hdr->mime.type = MIME_TYPE_TEXT;
  26         hdr->mime.type_charset = MIME_TYPE_CHARSET_US_ASCII;
  27         hdr->mime.subtype = MIME_SUBTYPE_PLAIN;
  28         hdr->mime.disposition = MIME_DISPOSITION_UNKNOWN;
  29
  30         /* [RFC2045] "Content-Transfer-Encoding: 7BIT" is assumed if the
  31          *  Content-Transfer-Encoding header field is not present.
  32          *  ... If a Content-Transfer-Encoding header field appears as part
  33          *  of a message header, it applies to the entire body of that message.
  34          *  If a Content-Transfer-Encoding header field appears as part of an
  35          *  entity's headers, it applies only to the body of that entity.
  36          *  If an entity is of type "multipart" the Content-Transfer-Encoding
  37          *  is not permitted to have any value other than "7bit", "8bit" or
  38          *  "binary".
  39          */
  40         hdr->mime.transfer_encoding = MIME_ENCODING_7BIT;
  41 }
  42
  43 void parse_mail_header(FILE *fh, struct mail_header *hdr)
  44 {
  45         char buf[1024];
  46         char *crlf;
  47         unsigned int fld_cont;  /* RFC822 Header field folding flag */
  48         unsigned int fa_valid;  /* Valid From Address flag */
  49
  50         crlf = NULL;
  51         fld_cont = 0;
  52         fa_valid = 0;
  53
  54         /* Scan all lines */
  55         do {
  56                 /*
  57                  *  Don't get a new line if we are coming from a folding
  58                  * field
  59                  */
  60                 if (!fld_cont) {
  61                         if (fgets(buf, sizeof(buf), fh) == NULL) {
  62                                 break;
  63                         }
  64                 }
  65
  66                 fld_cont = 0;
  67
  68                 if (!strncasecmp(buf, "From:", 5)) {
  69                         rfc5322_extract_address(hdr->from, buf, sizeof(hdr->from));
  70                         fa_valid = 1;
  71                 } else if (!strncasecmp(buf, "Reply-to:", 9)) {
  72                         if (fa_valid)
  73                                 continue;
  74
  75                         if (!rfc5322_extract_address(hdr->from, buf, sizeof(hdr->from))) {
  76                                 fa_valid = 1;
  77                         }
  78
  79                 } else if (!strncasecmp(buf, "Subject:", 8)) {
  80                         rfc5322_extract_subject(hdr->subject, buf, sizeof(hdr->subject));
  81                 } else if (!strncasecmp(buf, "Date:", 5)) {
  82                         hdr->date = rfc822_parsedt(buf);
  83                 } else if (!strncasecmp(buf, "Content-Type:", 13)) {
  84                         mime_content_type(buf + 14, &hdr->mime);
  85
  86                         while (fgets(buf, sizeof(buf), fh)) {
  87                                 if (rfc822_check_field_folding(buf)) {
  88                                         /* Decode folded line */
  89                                         mime_content_type_parameter(buf, &hdr->mime);
  90                                 } else {
  91                                         fld_cont = 1;
  92                                         break;
  93                                 }
  94                         }
  95                 } else if (!strncasecmp(buf, "Content-Disposition:", 20)) {
  96                         mime_content_disposition(buf + 21, &hdr->mime);
  97                 } else if (!strncasecmp(buf, "Content-Transfer-Encoding:", 26)) {
  98                         mime_content_transfer_encoding(buf + 27, &hdr->mime);
  99                 } else {
 100                         /*printf("[SKIP] ------- %s", buf);*/
 101                 }
 102         } while (!rfc822_check_header_end(buf));
 103
 104         /* If a valid 'from' address was found calc the MD5 of this address */
 105         if (fa_valid) {
 106                 crlf = strrchr(hdr->from, '\n');
 107                 if (crlf)
 108                         *crlf = '\0';
 109
 110                 md5_calc_sum(hdr->from, hdr->addr_md5);
 111         }
 112
 113         /* Get file offset of the message body */
 114         hdr->body_offset = ftell(fh);
 115 }
 116
 117