New "-m, --mac" option which allows for specifying the MAC address to

use in the DHCP request.


git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1765 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 58 insertions, 12 deletions

diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c
index db67389..a0f150f 100644
--- a/plugins-root/check_dhcp.c
+++ b/plugins-root/check_dhcp.c
@@ -50,6 +50,7 @@ const char *email = "nagiosplug-devel@lists.sourceforge.net";
 #include "netutils.h"
 #include "utils.h"
 
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -211,6 +212,7 @@ u_int8_t unicast = 0;        /* unicast mode: mimic a DHCP relay */
 struct in_addr my_ip;        /* our address (required for relay) */
 struct in_addr dhcp_ip;      /* server to query (if in unicast mode) */
 unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]="";
+unsigned char *user_specified_mac=NULL;
 
 char network_interface_name[IFNAMSIZ]="eth0";
 
@@ -241,6 +243,8 @@ int validate_arguments(void);
 void print_usage(void);
 void print_help(void);
 
+unsigned char *mac_aton(const char *);
+void print_hardware_address(const unsigned char *);
 int get_hardware_address(int,char *);
 int get_ip_address(int,char *);
 
@@ -279,7 +283,10 @@ int main(int argc, char **argv){
         dhcp_socket=create_dhcp_socket();
 
         /* get hardware address of client machine */
-        get_hardware_address(dhcp_socket,network_interface_name);
+        if(user_specified_mac!=NULL)
+                memcpy(client_hardware_address,user_specified_mac,6);
+        else
+                get_hardware_address(dhcp_socket,network_interface_name);
 
         if(unicast) /* get IP address of client machine */
                 get_ip_address(dhcp_socket,network_interface_name);
@@ -308,8 +315,6 @@ int main(int argc, char **argv){
 /* determines hardware address on client machine */
 int get_hardware_address(int sock,char *interface_name){
 
-        int i;
-
 #if defined(__linux__)
         struct ifreq ifr;
 
@@ -404,16 +409,12 @@ int get_hardware_address(int sock,char *interface_name){
                                                 /* Kompf 2000-2003 */
 
 #else
-        printf(_("Error: can't get MAC address for this architecture.\n"));
+        printf(_("Error: can't get MAC address for this architecture.  Use the --mac option.\n"));
         exit(STATE_UNKNOWN);
 #endif
 
-        if(verbose){ 
-                printf(_("Hardware address: "));
-                for (i=0; i<6; ++i)
-                        printf("%2.2x", client_hardware_address[i]);
-                printf( "\n");
-                }
+        if(verbose)
+                print_hardware_address(client_hardware_address);
 
         return OK;
         }
@@ -1097,6 +1098,7 @@ int call_getopt(int argc, char **argv){
                 {"requestedip",    required_argument,0,'r'},
                 {"timeout",        required_argument,0,'t'},
                 {"interface",      required_argument,0,'i'},
+                {"mac",            required_argument,0,'m'},
                 {"unicast",        no_argument,      0,'u'},
                 {"verbose",        no_argument,      0,'v'},
                 {"version",        no_argument,      0,'V'},
@@ -1105,7 +1107,7 @@ int call_getopt(int argc, char **argv){
         };
 
         while(1){
-                c=getopt_long(argc,argv,"+hVvt:s:r:t:i:u",long_options,&option_index);
+                c=getopt_long(argc,argv,"+hVvt:s:r:t:i:m:u",long_options,&option_index);
 
                 i++;
 
@@ -1162,6 +1164,15 @@ int call_getopt(int argc, char **argv){
                         */
                         break;
 
+                case 'm': /* MAC address */
+
+                        if((user_specified_mac=mac_aton(optarg)) == NULL)
+                                usage("Cannot parse MAC address.\n");
+                        if(verbose)
+                                print_hardware_address(user_specified_mac);
+
+                        break;
+
                 case 'i': /* interface name */
 
                         strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1);
@@ -1341,6 +1352,39 @@ long mac_addr_dlpi( const char *dev, int unit, u_char  *addr){
 #endif
 
 
+/* parse MAC address string, return 6 bytes (unterminated) or NULL */
+unsigned char *mac_aton(const char *string){
+        static unsigned char result[6];
+        char tmp[3];
+        unsigned i, j;
+
+        for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){
+                /* ignore ':' and any other non-hex character */
+                if(!isxdigit(string[i]) || !isxdigit(string[i+1]))
+                        continue;
+                tmp[0]=string[i];
+                tmp[1]=string[i+1];
+                tmp[2]='\0';
+                result[j]=strtol(tmp,(char **)NULL,16);
+                i++;
+                j++;
+                }
+
+        return (j==6) ? result : NULL;
+        }
+
+
+void print_hardware_address(const unsigned char *address){
+        int i;
+
+        printf(_("Hardware address: "));
+        for (i=0; i<5; i++)
+                printf("%2.2x:", address[i]);
+        printf("%2.2x", address[i]);
+        putchar('\n');
+        }
+
+
 /* print usage help */
 void print_help(void){
 
@@ -1367,6 +1411,8 @@ void print_help(void){
   printf ("    %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs"));
   printf (" %s\n", "-i, --interface=STRING");
   printf ("    %s\n", _("Interface to to use for listening (i.e. eth0)"));
+  printf (" %s\n", "-m, --mac=STRING");
+  printf ("    %s\n", _("MAC address to use in the DHCP request"));
   printf (" %s\n", "-u, --unicast");
   printf ("    %s\n", _("Unicast testing: mimic a DHCP relay, requires -s"));
 
@@ -1379,7 +1425,7 @@ print_usage(void){
         
   printf (_("Usage:"));
   printf (" %s [-v] [-u] [-s serverip] [-r requestedip] [-t timeout]\n",progname);
-  printf ("                  [-i interface]\n");
+  printf ("                  [-i interface] [-m mac]\n");
   
         return;
         }