src/src/spool_mbox.c

   1 /* $Cambridge: exim/src/src/spool_mbox.c,v 1.9 2005/08/01 13:51:05 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   uschar *mbox_delimiter;
  40   uschar *envelope_from;
  41   uschar *envelope_to;
  42
  43   if (!spool_mbox_ok) {
  44     /* create scan directory, if not present */
  45     if (!directory_make(spool_directory, US "scan", 0750, FALSE)) {
  46       debug_printf("unable to create directory: %s/scan\n", spool_directory);
  47       return NULL;
  48     };
  49
  50     /* create temp directory inside scan dir */
  51     snprintf(CS mbox_path, 1024, "%s/scan/%s", spool_directory, message_id);
  52     if (!directory_make(NULL, mbox_path, 0750, FALSE)) {
  53       debug_printf("unable to create directory: %s/scan/%s\n", spool_directory, message_id);
  54       return NULL;
  55     };
  56
  57     /* open [message_id].eml file for writing */
  58     snprintf(CS mbox_path, 1024, "%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
  59     mbox_file = Ufopen(mbox_path,"wb");
  60
  61     if (mbox_file == NULL) {
  62       debug_printf("unable to open file for writing: %s\n", mbox_path);
  63       return NULL;
  64     };
  65
  66     /* Generate mailbox delimiter */
  67     mbox_delimiter = expand_string(US"From ${sender_address} ${tod_bsdinbox}\n");
  68     if (mbox_delimiter != NULL) {
  69       if (mbox_delimiter[0] != 0) {
  70         i = fwrite(mbox_delimiter, 1, Ustrlen(mbox_delimiter), mbox_file);
  71         if (i != Ustrlen(mbox_delimiter)) {
  72           debug_printf("error/short write on writing in: %s", mbox_path);
  73           (void)fclose(mbox_file);
  74           return NULL;
  75         };
  76       };
  77     };
  78     /* Generate X-Envelope-From header */
  79     envelope_from = expand_string(US"${sender_address}");
  80     if (envelope_from != NULL) {
  81       if (envelope_from[0] != 0) {
  82         uschar *my_envelope_from;
  83         my_envelope_from = string_sprintf("X-Envelope-From: <%s>\n", envelope_from);
  84         i = fwrite(my_envelope_from, 1, Ustrlen(my_envelope_from), mbox_file);
  85         if (i != Ustrlen(my_envelope_from)) {
  86           debug_printf("error/short write on writing in: %s", mbox_path);
  87           (void)fclose(mbox_file);
  88           return NULL;
  89         };
  90       };
  91     };
  92     /* Generate X-Envelope-To header */
  93     envelope_to = expand_string(US"${if def:received_for{$received_for}}");
  94     if (envelope_to != NULL) {
  95       if (envelope_to[0] != 0) {
  96         uschar *my_envelope_to;
  97         my_envelope_to = string_sprintf("X-Envelope-To: <%s>\n", envelope_to);
  98         i = fwrite(my_envelope_to, 1, Ustrlen(my_envelope_to), mbox_file);
  99         if (i != Ustrlen(my_envelope_to)) {
 100           debug_printf("error/short write on writing in: %s", mbox_path);
 101           (void)fclose(mbox_file);
 102           return NULL;
 103         };
 104       };
 105     };
 106
 107     /* write all header lines to mbox file */
 108     my_headerlist = header_list;
 109     while (my_headerlist != NULL) {
 110
 111       /* skip deleted headers */
 112       if (my_headerlist->type == '*') {
 113         my_headerlist = my_headerlist->next;
 114         continue;
 115       };
 116
 117       i = fwrite(my_headerlist->text, 1, my_headerlist->slen, mbox_file);
 118       if (i != my_headerlist->slen) {
 119         debug_printf("error/short write on writing in: %s", mbox_path);
 120         (void)fclose(mbox_file);
 121         return NULL;
 122       };
 123
 124       my_headerlist = my_headerlist->next;
 125     };
 126
 127     /* copy body file */
 128     message_subdir[1] = '\0';
 129     for (i = 0; i < 2; i++) {
 130       message_subdir[0] = (split_spool_directory == (i == 0))? message_id[5] : 0;
 131       sprintf(CS mbox_path, "%s/input/%s/%s-D", spool_directory, message_subdir, message_id);
 132       data_file = Ufopen(mbox_path,"rb");
 133       if (data_file != NULL)
 134         break;
 135     };
 136
 137     /* The code used to use this line, but it doesn't work in Cygwin.
 138      *
 139      *  (void)fread(data_buffer, 1, 18, data_file);
 140      *
 141      * What's happening is that spool_mbox used to use an fread to jump over the
 142      * file header. That fails under Cygwin because the header is locked, but
 143      * doing an fseek succeeds. We have to output the leading newline
 144      * explicitly, because the one in the file is parted of the locked area.
 145      */
 146
 147     (void)fwrite("\n", 1, 1, mbox_file);
 148     (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET);
 149
 150     do {
 151       j = fread(data_buffer, 1, sizeof(data_buffer), data_file);
 152
 153       if (j > 0) {
 154         i = fwrite(data_buffer, 1, j, mbox_file);
 155         if (i != j) {
 156           debug_printf("error/short write on writing in: %s", mbox_path);
 157           (void)fclose(mbox_file);
 158           (void)fclose(data_file);
 159           return NULL;
 160         };
 161       };
 162     } while (j > 0);
 163
 164     (void)fclose(data_file);
 165     (void)fclose(mbox_file);
 166     Ustrcpy(spooled_message_id, message_id);
 167     spool_mbox_ok = 1;
 168   };
 169
 170   snprintf(CS mbox_path, 1024, "%s/scan/%s/%s.eml", spool_directory, message_id, message_id);
 171
 172   /* get the size of the mbox message */
 173   stat(CS mbox_path, &statbuf);
 174   *mbox_file_size = statbuf.st_size;
 175
 176   /* open [message_id].eml file for reading */
 177   mbox_file = Ufopen(mbox_path,"rb");
 178
 179   return mbox_file;
 180 }
 181
 182 /* remove mbox spool file, demimed files and temp directory */
 183 void unspool_mbox(void) {
 184
 185   /* reset all exiscan state variables */
 186   #ifdef WITH_OLD_DEMIME
 187   demime_ok = 0;
 188   demime_errorlevel = 0;
 189   demime_reason = NULL;
 190   file_extensions = NULL;
 191   #endif
 192
 193   spam_ok = 0;
 194   malware_ok = 0;
 195
 196   if (spool_mbox_ok) {
 197
 198     spool_mbox_ok = 0;
 199
 200     if (!no_mbox_unspool) {
 201       uschar mbox_path[1024];
 202       uschar file_path[1024];
 203       int n;
 204       struct dirent *entry;
 205       DIR *tempdir;
 206
 207       snprintf(CS mbox_path, 1024, "%s/scan/%s", spool_directory, spooled_message_id);
 208
 209   tempdir = opendir(CS mbox_path);
 210   /* loop thru dir & delete entries */
 211   n = 0;
 212   do {
 213     entry = readdir(tempdir);
 214     if (entry == NULL) break;
 215     snprintf(CS file_path, 1024,"%s/scan/%s/%s", spool_directory, spooled_message_id, entry->d_name);
 216     if ( (Ustrcmp(entry->d_name,"..") != 0) && (Ustrcmp(entry->d_name,".") != 0) ) {
 217       debug_printf("unspool_mbox(): unlinking '%s'\n", file_path);
 218               n = unlink(CS file_path);
 219             };
 220   } while (n > -1);
 221
 222   closedir(tempdir);
 223
 224   /* remove directory */
 225   n = rmdir(CS mbox_path);
 226     };
 227   };
 228 }
 229
 230 #endif