v26

[android-x86/external-wireless-tools.git] / wireless_tools / iwredir.c

diff --git a/wireless_tools/iwredir.c b/wireless_tools/iwredir.c
new file mode 100644 (file)
index 0000000..ef99249
--- /dev/null
+++ b/wireless_tools/iwredir.c
@@ -0,0 +1,124 @@
+/*
+ *     Wireless Tools
+ *
+ *             Jean II - HPL 03
+ *
+ * Main code for "iwredir". This is a hack to match multiple version
+ * of the tools with multiple kernels on the same system...
+ *
+ * This file is released under the GPL license.
+ *     Copyright (c) 2003 Jean Tourrilhes <jt@hpl.hp.com>
+ */
+
+/***************************** INCLUDES *****************************/
+
+#include "iwlib.h"             /* Header */
+
+/*********************** VERSION SUBROUTINES ***********************/
+
+/*------------------------------------------------------------------*/
+/*
+ * Extract WE version number from /proc/net/wireless
+ * If we have WE-16 and later, the WE version is available at the
+ * end of the header line of the file.
+ * For version prior to that, we can only detect the change from
+ * v11 to v12, so we do an approximate job. Fortunately, v12 to v15
+ * are highly binary compatible (on the struct level).
+ */
+static int
+iw_get_kernel_we_version(void)
+{
+  char         buff[1024];
+  FILE *       fh;
+  char *       p;
+  int          v;
+
+  /* Check if /proc/net/wireless is available */
+  fh = fopen(PROC_NET_WIRELESS, "r");
+
+  if(fh == NULL)
+    {
+      fprintf(stderr, "Cannot read " PROC_NET_WIRELESS "\n");
+      return(-1);
+    }
+
+  /* Read the first line of buffer */
+  fgets(buff, sizeof(buff), fh);
+
+  if(strstr(buff, "| WE") == NULL)
+    {
+      /* Prior to WE16, so explicit version not present */
+
+      /* Black magic */
+      if(strstr(buff, "| Missed") == NULL)
+       v = 11;
+      else
+       v = 15;
+      fclose(fh);
+      return(v);
+    }
+
+  /* Read the second line of buffer */
+  fgets(buff, sizeof(buff), fh);
+
+  /* Get to the last separator, to get the version */
+  p = strrchr(buff, '|');
+  if((p == NULL) || (sscanf(p + 1, "%d", &v) != 1))
+    {
+      fprintf(stderr, "Cannot parse " PROC_NET_WIRELESS "\n");
+      fclose(fh);
+      return(-1);
+    }
+
+  fclose(fh);
+  return(v);
+}
+
+/******************************* MAIN ********************************/
+
+/*------------------------------------------------------------------*/
+/*
+ * The main !
+ */
+int
+main(int       argc,
+     char **   argv)
+{
+  int  version = 0;
+  int  goterr = 0;
+  char file[512];
+  int  flen;
+
+  /* Get current version */
+  version = iw_get_kernel_we_version();
+  if(version <= 0)
+    version = 15;      /* We can only read only WE16 and higher */
+
+  /* Special case for Wireless Extension Version... */
+  /* This is mostly used in the Makefile, we use an "unlikely" option
+   * to maximise transparency to the tool we masquerade - Jean II */
+  if((argc > 1) && !strcmp(argv[1], "-wev"))
+    {
+      printf("%d\n", version);
+      return(version);
+    }
+
+  /* Mangle the command name */
+  flen = strlen(argv[0]);
+  if((flen + 3) >= 512)
+    {
+      fprintf(stderr, "Command name too long [%s]\n", argv[0]);
+      return(-1);
+    }
+  memcpy(file, argv[0], flen + 1);
+  sprintf(file + flen, "%d", version);
+
+  /* Execute (won't return) */
+  goterr = execvp(file, argv);
+
+  /* In case of error */
+  fprintf(stderr, "Can't execute command %s: %s\n", file, strerror(errno));
+  return(goterr);
+}
+
+