Fix potential unaligned accesses in the string pool (Issue #5474)

[thirdparty/cups.git] / cups / backend.c

diff --git a/cups/backend.c b/cups/backend.c
index 477d38ecd54c76b109e69958f660b5d3bcd495c4..4f5099be5029f9c8ca7ea4966a0eeeb1122377ba 100644 (file)
--- a/cups/backend.c
+++ b/cups/backend.c
@@ -1,31 +1,26 @@
 /*
- * "$Id: backend.c 7583 2008-05-16 17:47:16Z mike $"
+ * Backend functions for CUPS.
  *
- *   Backend functions for the Common UNIX Printing System (CUPS).
+ * Copyright 2007-2015 by Apple Inc.
+ * Copyright 2006 by Easy Software Products.
  *
- *   Copyright 2007-2008 by Apple Inc.
- *   Copyright 2006 by Easy Software Products.
- *
- *   These coded instructions, statements, and computer programs are the
- *   property of Apple Inc. and are protected by Federal copyright
- *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
- *   which should have been included with this file.  If this file is
- *   file is missing or damaged, see the license at "http://www.cups.org/".
- *
- *   This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- *   cupsBackendDeviceURI() - Get the device URI for a backend.
+ * Licensed under Apache License v2.0.  See the file "LICENSE" for more information.
  */
 
 /*
  * Include necessary headers...
  */
 
-#include <stdlib.h>
+#include "cups-private.h"
 #include "backend.h"
-#include "globals.h"
+#include "ppd.h"
+
+
+/*
+ * Local functions...
+ */
+
+static void    quote_string(const char *s);
 
 
 /*
@@ -35,13 +30,19 @@
  * function returns the device URI passed in the DEVICE_URI environment
  * variable or the device URI passed in argv[0], whichever is found
  * first.
+ *
+ * @since CUPS 1.2/macOS 10.5@
  */
 
 const char *                           /* O - Device URI or @code NULL@ */
 cupsBackendDeviceURI(char **argv)      /* I - Command-line arguments */
 {
-  const char   *device_uri;            /* Device URI */
+  const char   *device_uri,            /* Device URI */
+               *auth_info_required;    /* AUTH_INFO_REQUIRED env var */
   _cups_globals_t *cg = _cupsGlobals();        /* Global info */
+  int          options;                /* Resolve options */
+  ppd_file_t   *ppd;                   /* PPD file */
+  ppd_attr_t   *ppdattr;               /* PPD attribute */
 
 
   if ((device_uri = getenv("DEVICE_URI")) == NULL)
@@ -52,11 +53,84 @@ cupsBackendDeviceURI(char **argv)   /* I - Command-line arguments */
     device_uri = argv[0];
   }
 
+  options = _HTTP_RESOLVE_STDERR;
+  if ((auth_info_required = getenv("AUTH_INFO_REQUIRED")) != NULL &&
+      !strcmp(auth_info_required, "negotiate"))
+    options |= _HTTP_RESOLVE_FQDN;
+
+  if ((ppd = ppdOpenFile(getenv("PPD"))) != NULL)
+  {
+    if ((ppdattr = ppdFindAttr(ppd, "cupsIPPFaxOut", NULL)) != NULL &&
+        !_cups_strcasecmp(ppdattr->value, "true"))
+      options |= _HTTP_RESOLVE_FAXOUT;
+
+    ppdClose(ppd);
+  }
+
   return (_httpResolveURI(device_uri, cg->resolved_uri,
-                          sizeof(cg->resolved_uri)));
+                          sizeof(cg->resolved_uri), options, NULL, NULL));
+}
+
+
+/*
+ * 'cupsBackendReport()' - Write a device line from a backend.
+ *
+ * This function writes a single device line to stdout for a backend.
+ * It handles quoting of special characters in the device-make-and-model,
+ * device-info, device-id, and device-location strings.
+ *
+ * @since CUPS 1.4/macOS 10.6@
+ */
+
+void
+cupsBackendReport(
+    const char *device_scheme,         /* I - device-scheme string */
+    const char *device_uri,            /* I - device-uri string */
+    const char *device_make_and_model, /* I - device-make-and-model string or @code NULL@ */
+    const char *device_info,           /* I - device-info string or @code NULL@ */
+    const char *device_id,             /* I - device-id string or @code NULL@ */
+    const char *device_location)       /* I - device-location string or @code NULL@ */
+{
+  if (!device_scheme || !device_uri)
+    return;
+
+  printf("%s %s", device_scheme, device_uri);
+  if (device_make_and_model && *device_make_and_model)
+    quote_string(device_make_and_model);
+  else
+    quote_string("unknown");
+  quote_string(device_info);
+  quote_string(device_id);
+  quote_string(device_location);
+  putchar('\n');
+  fflush(stdout);
 }
 
 
 /*
- * End of "$Id: backend.c 7583 2008-05-16 17:47:16Z mike $".
+ * 'quote_string()' - Write a quoted string to stdout, escaping \ and ".
  */
+
+static void
+quote_string(const char *s)            /* I - String to write */
+{
+  fputs(" \"", stdout);
+
+  if (s)
+  {
+    while (*s)
+    {
+      if (*s == '\\' || *s == '\"')
+       putchar('\\');
+
+      if (((*s & 255) < ' ' && *s != '\t') || *s == 0x7f)
+        putchar(' ');
+      else
+        putchar(*s);
+
+      s ++;
+    }
+  }
+
+  putchar('\"');
+}