Accept "exim -bp -qGname"

[users/jgh/exim.git] / src / src / mime.c

diff --git a/src/src/mime.c b/src/src/mime.c
index cc9ffb7c6f3928aa841ae84a434dbe0af9782a44..0339295f37c242010fe4924b5265be17143a6f47 100644 (file)
--- a/src/src/mime.c
+++ b/src/src/mime.c
@@ -2,8 +2,10 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015 */
-/* License: GPL */
+/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015
+ * License: GPL
+ * Copyright (c) The Exim Maintainers 2016
+ */
 
 #include "exim.h"
 #ifdef WITH_CONTENT_SCAN       /* entire file */
@@ -13,19 +15,43 @@
 FILE *mime_stream = NULL;
 uschar *mime_current_boundary = NULL;
 
+static mime_header mime_header_list[] = {
+  { US"content-type:",              13, &mime_content_type },
+  { US"content-disposition:",       20, &mime_content_disposition },
+  { US"content-transfer-encoding:", 26, &mime_content_transfer_encoding },
+  { US"content-id:",                11, &mime_content_id },
+  { US"content-description:",       20, &mime_content_description }
+};
+
+static int mime_header_list_size = nelem(mime_header_list);
+
+static mime_parameter mime_parameter_list[] = {
+  { US"name=",     5, &mime_filename },
+  { US"filename=", 9, &mime_filename },
+  { US"charset=",  8, &mime_charset  },
+  { US"boundary=", 9, &mime_boundary }
+};
+
+
 /*************************************************
 * set MIME anomaly level + text                  *
 *************************************************/
 
 /* Small wrapper to set the two expandables which
    give info on detected "problems" in MIME
-   encodings. Those are defined in mime.h. */
+   encodings. Indexes are defined in mime.h. */
 
-static void
-mime_set_anomaly(int level, const char *text)
+void
+mime_set_anomaly(int idx)
 {
-  mime_anomaly_level = level;
-  mime_anomaly_text = CUS text;
+struct anom {
+  int level;
+  const uschar * text;
+} anom[] = { {1, CUS"Broken Quoted-Printable encoding detected"},
+            {2, CUS"Broken BASE64 encoding detected"} };
+
+mime_anomaly_level = anom[idx].level;
+mime_anomaly_text =  anom[idx].text;
 }
 
 
@@ -99,84 +125,6 @@ mime_decode_asis(FILE* in, FILE* out, uschar* boundary)
 }
 
 
-/* decode base64 MIME part */
-static ssize_t
-mime_decode_base64(FILE* in, FILE* out, uschar* boundary)
-{
-  uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH];
-  uschar *ipos, *opos;
-  ssize_t len, size = 0;
-  int bytestate = 0;
-
-  opos = obuf;
-
-  while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL)
-    {
-    if (boundary != NULL
-       && Ustrncmp(ibuf, "--", 2) == 0
-       && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0
-       )
-      break;
-
-    for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos)
-      {
-      if (*ipos == '=')                        /* skip padding */
-        {
-        ++bytestate;
-        continue;
-       }
-      if (mime_b64[*ipos] == 128)      /* skip bad characters */
-        {
-        mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64);
-        continue;
-       }
-
-      /* simple state-machine */
-      switch((bytestate++) & 3)
-        {
-        case 0:
-          *opos = mime_b64[*ipos] << 2;
-           break;
-        case 1:
-          *opos |= mime_b64[*ipos] >> 4;
-          ++opos;
-          *opos = mime_b64[*ipos] << 4;
-          break;
-        case 2:
-          *opos |= mime_b64[*ipos] >> 2;
-          ++opos;
-          *opos = mime_b64[*ipos] << 6;
-          break;
-        case 3:
-          *opos |= mime_b64[*ipos];
-          ++opos;
-          break;
-       } /* switch */
-      } /* for */
-
-    /* something to write? */
-    len = opos - obuf;
-    if (len > 0)
-      {
-      if (fwrite(obuf, 1, len, out) != len) return -1; /* error */
-      size += len;
-      /* copy incomplete last byte to start of obuf, where we continue */
-      if ((bytestate & 3) != 0)
-        *obuf = *opos;
-      opos = obuf;
-      }
-    } /* while */
-
-  /* write out last byte if it was incomplete */
-  if (bytestate & 3)
-    {
-    if (fwrite(obuf, 1, 1, out) != 1) return -1;
-    ++size;
-    }
-
-  return size;
-}
-
 
 /* decode quoted-printable MIME part */
 static ssize_t
@@ -358,7 +306,8 @@ decode_function =
 size_counter = decode_function(mime_stream, decode_file, mime_current_boundary);
 
 clearerr(mime_stream);
-fseek(mime_stream, f_pos, SEEK_SET);
+if (fseek(mime_stream, f_pos, SEEK_SET))
+  return DEFER;
 
 if (fclose(decode_file) != 0 || size_counter < 0)
   return DEFER;
@@ -516,11 +465,11 @@ while (*s && *s != ';')           /* ; terminates */
     {
     s++;                       /* skip opening " */
     while (*s && *s != '"')    /* " protects ; */
-      val = string_cat(val, &size, &ptr, s++, 1);
+      val = string_catn(val, &size, &ptr, s++, 1);
     if (*s) s++;               /* skip closing " */
     }
   else
-    val = string_cat(val, &size, &ptr, s++, 1);
+    val = string_catn(val, &size, &ptr, s++, 1);
 if (val) val[ptr] = '\0';
 *sp = s;
 return val;
@@ -547,24 +496,24 @@ static uschar *
 rfc2231_to_2047(const uschar * fname, const uschar * charset, int * len)
 {
 int size = 0, ptr = 0;
-uschar * val = string_cat(NULL, &size, &ptr, US"=?", 2);
+uschar * val = string_catn(NULL, &size, &ptr, US"=?", 2);
 uschar c;
 
 if (charset)
-  val = string_cat(val, &size, &ptr, charset, Ustrlen(charset));
-val = string_cat(val, &size, &ptr, US"?Q?", 3);
+  val = string_cat(val, &size, &ptr, charset);
+val = string_catn(val, &size, &ptr, US"?Q?", 3);
 
 while ((c = *fname))
   if (c == '%' && isxdigit(fname[1]) && isxdigit(fname[2]))
     {
-    val = string_cat(val, &size, &ptr, US"=", 1);
-    val = string_cat(val, &size, &ptr, ++fname, 2);
+    val = string_catn(val, &size, &ptr, US"=", 1);
+    val = string_catn(val, &size, &ptr, ++fname, 2);
     fname += 2;
     }
   else
-    val = string_cat(val, &size, &ptr, fname++, 1);
+    val = string_catn(val, &size, &ptr, fname++, 1);
 
-val = string_cat(val, &size, &ptr, US"?=", 2);
+val = string_catn(val, &size, &ptr, US"?=", 2);
 val[*len = ptr] = '\0';
 return val;
 }