--- /dev/null
+/* $Cambridge: exim/src/src/regex.c,v 1.1.2.1 2004/11/26 09:24:05 tom Exp $ */
+
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* This file is part of the exiscan-acl content scanner
+patch. It is NOT part of the standard exim distribution. */
+
+/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */
+/* License: GPL */
+
+/* Code for matching regular expressions against headers and body.
+ Called from acl.c. */
+
+#include "exim.h"
+#include <unistd.h>
+#include <sys/mman.h>
+
+/* Structure to hold a list of Regular expressions */
+typedef struct pcre_list {
+ pcre *re;
+ uschar *pcre_text;
+ struct pcre_list *next;
+} pcre_list;
+
+uschar regex_match_string_buffer[1024];
+
+extern FILE *mime_stream;
+extern uschar *mime_current_boundary;
+
+int regex(uschar **listptr) {
+ int sep = 0;
+ uschar *list = *listptr;
+ uschar *regex_string;
+ uschar regex_string_buffer[1024];
+ unsigned long long mbox_size;
+ FILE *mbox_file;
+ pcre *re;
+ pcre_list *re_list_head = NULL;
+ pcre_list *re_list_item;
+ const char *pcre_error;
+ int pcre_erroffset;
+ uschar *linebuffer;
+ long f_pos = 0;
+
+ /* reset expansion variable */
+ regex_match_string = NULL;
+
+ if (mime_stream == NULL) {
+ /* We are in the DATA ACL */
+ mbox_file = spool_mbox(&mbox_size);
+ if (mbox_file == NULL) {
+ /* error while spooling */
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "regex acl condition: error while creating mbox spool file");
+ return DEFER;
+ };
+ }
+ else {
+ f_pos = ftell(mime_stream);
+ mbox_file = mime_stream;
+ };
+
+ /* precompile our regexes */
+ while ((regex_string = string_nextinlist(&list, &sep,
+ regex_string_buffer,
+ sizeof(regex_string_buffer))) != NULL) {
+
+ /* parse option */
+ if ( (strcmpic(regex_string,US"false") == 0) ||
+ (Ustrcmp(regex_string,"0") == 0) ) {
+ /* explicitly no matching */
+ continue;
+ };
+
+ /* compile our regular expression */
+ re = pcre_compile( CS regex_string,
+ 0,
+ &pcre_error,
+ &pcre_erroffset,
+ NULL );
+
+ if (re == NULL) {
+ log_write(0, LOG_MAIN,
+ "regex acl condition warning - error in regex '%s': %s at offset %d, skipped.", regex_string, pcre_error, pcre_erroffset);
+ continue;
+ }
+ else {
+ re_list_item = store_get(sizeof(pcre_list));
+ re_list_item->re = re;
+ re_list_item->pcre_text = string_copy(regex_string);
+ re_list_item->next = re_list_head;
+ re_list_head = re_list_item;
+ };
+ };
+
+ /* no regexes -> nothing to do */
+ if (re_list_head == NULL) {
+ return FAIL;
+ };
+
+ /* match each line against all regexes */
+ linebuffer = store_get(32767);
+ while (fgets(CS linebuffer, 32767, mbox_file) != NULL) {
+ if ( (mime_stream != NULL) && (mime_current_boundary != NULL) ) {
+ /* check boundary */
+ if (Ustrncmp(linebuffer,"--",2) == 0) {
+ if (Ustrncmp((linebuffer+2),mime_current_boundary,Ustrlen(mime_current_boundary)) == 0)
+ /* found boundary */
+ break;
+ };
+ };
+ re_list_item = re_list_head;
+ do {
+ /* try matcher on the line */
+ if (pcre_exec(re_list_item->re, NULL, CS linebuffer,
+ (int)Ustrlen(linebuffer), 0, 0, NULL, 0) >= 0) {
+ Ustrncpy(regex_match_string_buffer, re_list_item->pcre_text, 1023);
+ regex_match_string = regex_match_string_buffer;
+ if (mime_stream == NULL)
+ fclose(mbox_file);
+ else {
+ clearerr(mime_stream);
+ fseek(mime_stream,f_pos,SEEK_SET);
+ };
+ return OK;
+ };
+ re_list_item = re_list_item->next;
+ } while (re_list_item != NULL);
+ };
+
+ if (mime_stream == NULL)
+ fclose(mbox_file);
+ else {
+ clearerr(mime_stream);
+ fseek(mime_stream,f_pos,SEEK_SET);
+ };
+
+ /* no matches ... */
+ return FAIL;
+}
+
+
+int mime_regex(uschar **listptr) {
+ int sep = 0;
+ uschar *list = *listptr;
+ uschar *regex_string;
+ uschar regex_string_buffer[1024];
+ pcre *re;
+ pcre_list *re_list_head = NULL;
+ pcre_list *re_list_item;
+ const char *pcre_error;
+ int pcre_erroffset;
+ FILE *f;
+ uschar *mime_subject = NULL;
+ int mime_subject_len = 0;
+
+ /* reset expansion variable */
+ regex_match_string = NULL;
+
+ /* precompile our regexes */
+ while ((regex_string = string_nextinlist(&list, &sep,
+ regex_string_buffer,
+ sizeof(regex_string_buffer))) != NULL) {
+
+ /* parse option */
+ if ( (strcmpic(regex_string,US"false") == 0) ||
+ (Ustrcmp(regex_string,"0") == 0) ) {
+ /* explicitly no matching */
+ continue;
+ };
+
+ /* compile our regular expression */
+ re = pcre_compile( CS regex_string,
+ 0,
+ &pcre_error,
+ &pcre_erroffset,
+ NULL );
+
+ if (re == NULL) {
+ log_write(0, LOG_MAIN,
+ "regex acl condition warning - error in regex '%s': %s at offset %d, skipped.", regex_string, pcre_error, pcre_erroffset);
+ continue;
+ }
+ else {
+ re_list_item = store_get(sizeof(pcre_list));
+ re_list_item->re = re;
+ re_list_item->pcre_text = string_copy(regex_string);
+ re_list_item->next = re_list_head;
+ re_list_head = re_list_item;
+ };
+ };
+
+ /* no regexes -> nothing to do */
+ if (re_list_head == NULL) {
+ return FAIL;
+ };
+
+ /* check if the file is already decoded */
+ if (mime_decoded_filename == NULL) {
+ uschar *empty = US"";
+ /* no, decode it first */
+ mime_decode(&empty);
+ if (mime_decoded_filename == NULL) {
+ /* decoding failed */
+ log_write(0, LOG_MAIN,
+ "mime_regex acl condition warning - could not decode MIME part to file.");
+ return DEFER;
+ };
+ };
+
+
+ /* open file */
+ f = fopen(CS mime_decoded_filename, "r");
+ if (f == NULL) {
+ /* open failed */
+ log_write(0, LOG_MAIN,
+ "mime_regex acl condition warning - can't open '%s' for reading.", mime_decoded_filename);
+ return DEFER;
+ };
+
+ /* get 32k memory */
+ mime_subject = (uschar *)store_get(32767);
+
+ /* read max 32k chars from file */
+ mime_subject_len = fread(mime_subject, 1, 32766, f);
+
+ re_list_item = re_list_head;
+ do {
+ /* try matcher on the mmapped file */
+ debug_printf("Matching '%s'\n", re_list_item->pcre_text);
+ if (pcre_exec(re_list_item->re, NULL, CS mime_subject,
+ mime_subject_len, 0, 0, NULL, 0) >= 0) {
+ Ustrncpy(regex_match_string_buffer, re_list_item->pcre_text, 1023);
+ regex_match_string = regex_match_string_buffer;
+ fclose(f);
+ return OK;
+ };
+ re_list_item = re_list_item->next;
+ } while (re_list_item != NULL);
+
+ fclose(f);
+
+ /* no matches ... */
+ return FAIL;
+}
+