Adding upstream version 4.92.upstream/4.92upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 230 insertions, 0 deletions

diff --git a/src/srs.c b/src/srs.c
new file mode 100644
index 0000000..1ff391f
--- /dev/null
+++ b/src/srs.c
@@ -0,0 +1,230 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* SRS - Sender rewriting scheme support
+  (C)2004 Miles Wilton <miles@mirtol.com>
+  Copyright (c) The Exim Maintainers 2016
+
+  SRS Support Version: 1.0a
+
+  License: GPL */
+
+#include "exim.h"
+#ifdef EXPERIMENTAL_SRS
+
+#include <srs_alt.h>
+#include "srs.h"
+
+srs_t    *srs                   = NULL;
+uschar   *srs_db_forward        = NULL;
+uschar   *srs_db_reverse        = NULL;
+
+
+/* srs_init just initialises libsrs and creates (if necessary)
+   an srs object to use for all srs calls in this instance */
+
+int eximsrs_init()
+{
+  const uschar *list = srs_config;
+  uschar secret_buf[SRS_MAX_SECRET_LENGTH];
+  uschar *secret = NULL;
+  uschar sbuf[4];
+  uschar *sbufp;
+
+  /* Check if this instance of Exim has not initialized SRS */
+  if(srs == NULL)
+  {
+    int co = 0;
+    int hashlen, maxage;
+    BOOL usetimestamp, usehash;
+
+    /* Copy config vars */
+    hashlen = srs_hashlength;
+    maxage = srs_maxage;
+    usetimestamp = srs_usetimestamp;
+    usehash = srs_usehash;
+
+    /* Pass srs_config var (overrides new config vars) */
+    co = 0;
+    if(srs_config != NULL)
+    {
+      secret = string_nextinlist(&list, &co, secret_buf, SRS_MAX_SECRET_LENGTH);
+
+      if((sbufp = string_nextinlist(&list, &co, sbuf, sizeof(sbuf))) != NULL)
+        maxage = atoi(sbuf);
+
+      if((sbufp = string_nextinlist(&list, &co, sbuf, sizeof(sbuf))) != NULL)
+        hashlen = atoi(sbuf);
+
+      if((sbufp = string_nextinlist(&list, &co, sbuf, sizeof(sbuf))) != NULL)
+        usetimestamp = atoi(sbuf);
+
+      if((sbufp = string_nextinlist(&list, &co, sbuf, sizeof(sbuf))) != NULL)
+        usehash = atoi(sbuf);
+    }
+
+    if(srs_hashmin == -1)
+      srs_hashmin = hashlen;
+
+    /* First secret specified in secrets? */
+    co = 0;
+    list = srs_secrets;
+    if(secret == NULL || *secret == '\0')
+    {
+      if((secret = string_nextinlist(&list, &co, secret_buf, SRS_MAX_SECRET_LENGTH)) == NULL)
+      {
+        log_write(0, LOG_MAIN | LOG_PANIC,
+            "SRS Configuration Error: No secret specified");
+        return DEFER;
+      }
+    }
+
+    /* Check config */
+    if(maxage < 0 || maxage > 365)
+    {
+      log_write(0, LOG_MAIN | LOG_PANIC,
+          "SRS Configuration Error: Invalid maximum timestamp age");
+      return DEFER;
+    }
+    if(hashlen < 1 || hashlen > 20 || srs_hashmin < 1 || srs_hashmin > 20)
+    {
+      log_write(0, LOG_MAIN | LOG_PANIC,
+          "SRS Configuration Error: Invalid hash length");
+      return DEFER;
+    }
+
+    if((srs = srs_open(secret, Ustrlen(secret), maxage, hashlen, srs_hashmin)) == NULL)
+    {
+      log_write(0, LOG_MAIN | LOG_PANIC,
+          "Failed to allocate SRS memory");
+      return DEFER;
+    }
+
+    srs_set_option(srs, SRS_OPTION_USETIMESTAMP, usetimestamp);
+    srs_set_option(srs, SRS_OPTION_USEHASH, usehash);
+
+    /* Extra secrets? */
+    while((secret = string_nextinlist(&list, &co, secret_buf, SRS_MAX_SECRET_LENGTH)) != NULL)
+        srs_add_secret(srs, secret, (Ustrlen(secret) > SRS_MAX_SECRET_LENGTH) ? SRS_MAX_SECRET_LENGTH :  Ustrlen(secret));
+
+    DEBUG(D_any)
+      debug_printf("SRS initialized\n");
+  }
+
+  return OK;
+}
+
+
+int eximsrs_done()
+{
+  if(srs != NULL)
+    srs_close(srs);
+
+  srs = NULL;
+
+  return OK;
+}
+
+
+int eximsrs_forward(uschar **result, uschar *orig_sender, uschar *domain)
+{
+  char res[512];
+  int n;
+
+  if((n = srs_forward(srs, orig_sender, domain, res, sizeof(res))) & SRS_RESULT_FAIL)
+  {
+    DEBUG(D_any)
+      debug_printf("srs_forward failed (%s, %s): %s\n", orig_sender, domain, srs_geterrormsg(n));
+    return DEFER;
+  }
+
+  *result = string_copy(res);
+  return OK;
+}
+
+
+int eximsrs_reverse(uschar **result, uschar *address)
+{
+  char res[512];
+  int n;
+
+  if((n = srs_reverse(srs, address, res, sizeof(res))) & SRS_RESULT_FAIL)
+  {
+    DEBUG(D_any)
+      debug_printf("srs_reverse failed (%s): %s\n", address, srs_geterrormsg(n));
+    if(n == SRS_RESULT_NOTSRS || n == SRS_RESULT_BADSRS)
+      return DECLINE;
+    if(n == SRS_RESULT_BADHASH || n == SRS_RESULT_BADTIMESTAMP || n == SRS_RESULT_TIMESTAMPEXPIRED)
+      return FAIL;
+    return DEFER;
+  }
+
+  *result = string_copy(res);
+  return OK;
+}
+
+
+int eximsrs_db_set(BOOL reverse, uschar *srs_db)
+{
+  if(reverse)
+    srs_db_reverse = (srs_db == NULL ? NULL : string_copy(srs_db));
+  else
+    srs_db_forward = (srs_db == NULL ? NULL : string_copy(srs_db));
+
+  if(srs_set_db_functions(srs, (srs_db_forward ? eximsrs_db_insert : NULL),
+                               (srs_db_reverse ? eximsrs_db_lookup : NULL)) & SRS_RESULT_FAIL)
+    return DEFER;
+
+  return OK;
+}
+
+
+srs_result eximsrs_db_insert(srs_t *srs, char *data, uint data_len, char *result, uint result_len)
+{
+  uschar *res;
+  uschar buf[64];
+
+  if(srs_db_forward == NULL)
+    return SRS_RESULT_DBERROR;
+
+  srs_db_address = string_copyn(data, data_len);
+  if(srs_generate_unique_id(srs, srs_db_address, buf, 64) & SRS_RESULT_FAIL)
+    return SRS_RESULT_DBERROR;
+
+  srs_db_key = string_copyn(buf, 16);
+
+  if((res = expand_string(srs_db_forward)) == NULL)
+    return SRS_RESULT_DBERROR;
+
+  if(result_len < 17)
+    return SRS_RESULT_DBERROR;
+
+  Ustrncpy(result, srs_db_key, result_len);
+
+  return SRS_RESULT_OK;
+}
+
+
+srs_result eximsrs_db_lookup(srs_t *srs, char *data, uint data_len, char *result, uint result_len)
+{
+  uschar *res;
+
+  if(srs_db_reverse == NULL)
+    return SRS_RESULT_DBERROR;
+
+  srs_db_key = string_copyn(data, data_len);
+  if((res = expand_string(srs_db_reverse)) == NULL)
+    return SRS_RESULT_DBERROR;
+
+  if(Ustrlen(res) >= result_len)
+    return SRS_RESULT_ADDRESSTOOLONG;
+
+  strncpy(result, res, result_len);
+
+  return SRS_RESULT_OK;
+}
+
+
+#endif
+