120 lines
2.2 KiB
C
120 lines
2.2 KiB
C
/*
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* eql_enslave
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*
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* modeled from ifslave.c by Alan Cox (presumably?)
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*
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* (c) Copyright 1995 Simon Janes
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* NCM: Network and Communications Management, Inc.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/sockios.h>
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#include <linux/if.h>
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#include "/usr/src/linux/include/linux/if_eql.h"
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void check_running(char *device_name);
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int s;
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int
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main(int argc, char **argv)
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{
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struct ifreq ifr;
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slaving_request_t slaving_request;
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char master_name[16];
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int slave_mtu;
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int master_mtu;
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if (argc != 4)
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{
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fprintf (stderr, "usage: %s <master> <slave> <priority>\n", argv[0]);
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exit (1);
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}
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strcpy (master_name, argv[1]);
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strcpy (slaving_request.slave_name, argv[2]);
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slaving_request.priority = atol (argv[3]);
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s = socket (AF_INET, SOCK_DGRAM, 0);
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if ( s == -1)
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{
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perror ("socket");
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exit (1);
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}
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check_running (master_name);
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check_running (slaving_request.slave_name);
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strcpy (ifr.ifr_name, slaving_request.slave_name);
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if (ioctl (s, SIOCGIFMTU, &ifr) == -1)
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{
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perror("get MTU on slave failed");
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exit (1);
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}
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slave_mtu = ifr.ifr_mtu;
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strcpy (ifr.ifr_name, master_name);
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if (ioctl (s, SIOCGIFMTU, &ifr) == -1)
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{
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perror("get MTU on master failed");
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exit (1);
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}
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master_mtu = ifr.ifr_mtu;
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if ( master_mtu != slave_mtu )
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{
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fprintf (stderr,
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"master (%d) and slave (%d) MTU settings do not match\n",
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master_mtu, slave_mtu);
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exit (1);
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}
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strcpy (ifr.ifr_name, master_name);
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ifr.ifr_data = (caddr_t) &slaving_request;
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if(ioctl (s,EQL_ENSLAVE, &ifr)==-1)
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{
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perror("EQL_ENSLAVE failed");
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exit (1);
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}
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return 0;
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}
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void
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check_running(char *name)
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{
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struct ifreq ifr;
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strcpy (ifr.ifr_name, name);
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if ( ioctl (s, SIOCGIFFLAGS, &ifr) == -1)
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{
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perror (name);
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exit (1);
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}
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if (ifr.ifr_flags & (IFF_RUNNING | IFF_UP) != (IFF_RUNNING | IFF_UP))
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{
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fprintf (stderr, "Device '%s' is not up or running.\n", name);
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exit (1);
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}
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}
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/*
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* Local Variables:
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* compile-command: "gcc -Wall -Wstrict-prototypes -o eql_enslave eql_enslave.c"
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* End:
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*/
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