src/src/spool_mbox.c

   1 /* $Cambridge: exim/src/src/spool_mbox.c,v 1.3 2004/12/17 14:52:44 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
   8 /* License: GPL */
   9
  10 /* Code for setting up a MBOX style spool file inside a /scan/<msgid>
  11 sub directory of exim's spool directory. */
  12
  13 #include "exim.h"
  14 #ifdef WITH_CONTENT_SCAN
  15
  16 /* externals, we must reset them on unspooling */
  17 #ifdef WITH_OLD_DEMIME
  18 extern int demime_ok;
  19 extern struct file_extension *file_extensions;
  20 #endif
  21
  22 extern int malware_ok;
  23 extern int spam_ok;
  24
  25 int spool_mbox_ok = 0;
  26 uschar spooled_message_id[17];
  27
  28 /* returns a pointer to the FILE, and puts the size in bytes into mbox_file_size */
  29
  30 FILE *spool_mbox(unsigned long *mbox_file_size) {
  31   uschar mbox_path[1024];
  32   uschar message_subdir[2];
  33   uschar data_buffer[65535];
  34   FILE *mbox_file;
  35   FILE *data_file = NULL;
  36   header_line *my_headerlist;
  37   struct stat statbuf;
  38   int i,j;
  39
  40   if (!spool_mbox_ok) {
  41     /* create scan directory, if not present */
  42     if (!directory_make(spool_directory, US "scan", 0750, FALSE)) {
  43       debug_printf("unable to create directory: %s/scan\n", spool_directory);
  44       return NULL;
  45     };
  46
  47     /* create temp directory inside scan dir */
  48     snprintf(CS mbox_path, 1024, "%s/scan/%s", spool_directory, message_id);
  49     if (!directory_make(NULL, mbox_path, 0750, FALSE)) {
  50       debug_printf("unable to create directory: %s/scan/%s\n", spool_directory, message_id);
  51       return NULL;
  52     };
  53
  54     /* open [message_id].eml file for writing */
  55     snprintf(CS mbox_path, 1024, "%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
  56     mbox_file = Ufopen(mbox_path,"w");
  57
  58     if (mbox_file == NULL) {
  59       debug_printf("unable to open file for writing: %s\n", mbox_path);
  60       return NULL;
  61     };
  62
  63     /* write all header lines to mbox file */
  64     my_headerlist = header_list;
  65     while (my_headerlist != NULL) {
  66
  67       /* skip deleted headers */
  68       if (my_headerlist->type == '*') {
  69         my_headerlist = my_headerlist->next;
  70         continue;
  71       };
  72
  73       i = fwrite(my_headerlist->text, 1, my_headerlist->slen, mbox_file);
  74       if (i != my_headerlist->slen) {
  75         debug_printf("error/short write on writing in: %s", mbox_path);
  76         fclose(mbox_file);
  77         return NULL;
  78       };
  79
  80       my_headerlist = my_headerlist->next;
  81     };
  82
  83     /* copy body file */
  84     message_subdir[1] = '\0';
  85     for (i = 0; i < 2; i++) {
  86       message_subdir[0] = (split_spool_directory == (i == 0))? message_id[5] : 0;
  87       sprintf(CS mbox_path, "%s/input/%s/%s-D", spool_directory, message_subdir, message_id);
  88       data_file = Ufopen(mbox_path,"r");
  89       if (data_file != NULL)
  90         break;
  91     };
  92
  93     fread(data_buffer, 1, 18, data_file);
  94
  95     do {
  96       j = fread(data_buffer, 1, sizeof(data_buffer), data_file);
  97       if (j > 0) {
  98         i = fwrite(data_buffer, 1, j, mbox_file);
  99         if (i != j) {
 100           debug_printf("error/short write on writing in: %s", mbox_path);
 101           fclose(mbox_file);
 102           fclose(data_file);
 103           return NULL;
 104         };
 105       };
 106     } while (j > 0);
 107
 108     fclose(data_file);
 109     fclose(mbox_file);
 110     Ustrcpy(spooled_message_id, message_id);
 111     spool_mbox_ok = 1;
 112   };
 113
 114   snprintf(CS mbox_path, 1024, "%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
 115
 116   /* get the size of the mbox message */
 117   stat(CS mbox_path, &statbuf);
 118   *mbox_file_size = statbuf.st_size;
 119
 120   /* open [message_id].eml file for reading */
 121   mbox_file = Ufopen(mbox_path,"r");
 122
 123   return mbox_file;
 124 }
 125
 126 /* remove mbox spool file, demimed files and temp directory */
 127 void unspool_mbox(void) {
 128
 129   /* reset all exiscan state variables */
 130   #ifdef WITH_OLD_DEMIME
 131   demime_ok = 0;
 132   demime_errorlevel = 0;
 133   demime_reason = NULL;
 134   file_extensions = NULL;
 135   #endif
 136
 137   spam_ok = 0;
 138   malware_ok = 0;
 139
 140   if (spool_mbox_ok) {
 141
 142     spool_mbox_ok = 0;
 143
 144     if (!no_mbox_unspool) {
 145       uschar mbox_path[1024];
 146       uschar file_path[1024];
 147       int n;
 148       struct dirent *entry;
 149       DIR *tempdir;
 150
 151       snprintf(CS mbox_path, 1024, "%s/scan/%s", spool_directory, spooled_message_id);
 152
 153         tempdir = opendir(CS mbox_path);
 154         /* loop thru dir & delete entries */
 155         n = 0;
 156         do {
 157           entry = readdir(tempdir);
 158           if (entry == NULL) break;
 159           snprintf(CS file_path, 1024,"%s/scan/%s/%s", spool_directory, spooled_message_id, entry->d_name);
 160           if ( (Ustrcmp(entry->d_name,"..") != 0) && (Ustrcmp(entry->d_name,".") != 0) ) {
 161             debug_printf("unspool_mbox(): unlinking '%s'\n", file_path);
 162               n = unlink(CS file_path);
 163             };
 164         } while (n > -1);
 165
 166         closedir(tempdir);
 167
 168         /* remove directory */
 169         n = rmdir(CS mbox_path);
 170     };
 171   };
 172 }
 173
 174 #endif