This commit was manufactured by cvs2svn to create branch 'uc'.

[gnokii.git] / utils / mgnokiidev.c

diff --git a/utils/mgnokiidev.c b/utils/mgnokiidev.c
new file mode 100644 (file)
index 0000000..78b2090
--- /dev/null
+++ b/utils/mgnokiidev.c
@@ -0,0 +1,96 @@
+/*
+
+  $Id$
+  
+  G N O K I I
+
+  A Linux/Unix toolset and driver for Nokia mobile phones.
+
+  Released under the terms of the GNU GPL, see file COPYING for more details.
+
+  Mgnokiidev gets passed a slave pty name by gnokiid and uses this
+  information to create a symlink from the pty to /dev/gnokii.
+
+*/
+
+#include <stdio.h>
+#include <errno.h>
+#include <signal.h>
+#include <termios.h>
+#include <grp.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <ctype.h>
+
+#define DEVLEN 30
+#define MAXLEN 12
+
+int main(int argc, char *argv[])
+{
+  int count, err;
+  char dev_name[DEVLEN];
+
+  /* Check we have one and only one command line argument. */
+  if (argc != 2) {
+    fprintf(stderr, "mgnokiidev takes one and only one argument!\n");
+    exit(-2);
+  }
+
+  /* Check if argument has a reasonable length (less than MAXLEN characters) */
+  if (strlen(argv[1]) >= MAXLEN) {
+    fprintf(stderr, "Argument must be less than %d characters.\n", MAXLEN);
+    exit (-2);
+  }
+
+  strncpy(dev_name, argv[1], DEVLEN);
+
+  /* Check for suspicious characters. */
+  for (count = 0; count < strlen(dev_name); count ++)
+    if (!(isalnum(dev_name[count]) || dev_name[count]=='/')) {
+      fprintf(stderr, "Suspicious character at index %d in argument.\n", count);
+      exit (-2);
+    }
+
+  /* Now become root */
+  setuid(0);
+
+  /* Change group of slave pty to group of mgnokiidev */
+  err = chown(dev_name, -1, getgid());
+
+  if (err < 0) {
+    perror("mgnokiidev - chown: ");
+    exit (-2);
+  }
+
+  /* Change permissions to rw by group */
+  err = chmod(dev_name, S_IRGRP | S_IWGRP | S_IRUSR | S_IWUSR);
+       
+  if (err < 0) {
+    perror("mgnokiidev - chmod: ");
+    exit (-2);
+  }
+
+  /* FIXME: Possible bug - should check that /dev/gnokii doesn't already exist
+     in case multiple users are trying to run gnokii. Well, but will be
+     mgnokiidev called then? I do not think so - you will probably got the
+     message serialport in use or similar. Don't you. I haven't tested it
+     though. */
+
+  /* Remove symlink in case it already exists. Don't care if it fails.  */
+  unlink ("/dev/gnokii");
+
+  /* Create symlink */
+  err = symlink(dev_name, "/dev/gnokii");
+
+  if (err < 0) {
+    perror("mgnokiidev - symlink: ");
+    exit (-2);
+  }
+
+  /* Done */
+  exit (0);
+}