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vrrpd.c
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/*==========================[ (c) JME SOFT ]===================================
FILE : [vrrp.c]
CREATED : 00/02/02 12:54:37 LAST SAVE : 00/10/04 22:11:39
WHO : jerome@mycpu Linux 2.2.14
REMARK :
================================================================================
- This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version
2 of the License, or (at your option) any later version.
==============================================================================*/
/* system include */
#include <stdio.h>
#include <assert.h>
#include <net/ethernet.h>
#include <netinet/ip.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stddef.h>
#include <time.h>
#include <sys/sysinfo.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <sys/ioctl.h>
#include <ctype.h>
#include <string.h>
#include <sys/dir.h>
typedef unsigned int u64;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned char u8;
#include <linux/ethtool.h>
#include <linux/sockios.h>
#include <fcntl.h>
/* local include */
#include "vrrpd.h"
#include "ipaddr.h"
int ip_id = 0; /* to have my own ip_id creates collision with kernel ip->id
** but it should be ok because the packets are unlikely to be
** fragmented (they are non routable and small) */
/* WORK: this packet isnt routed, i can check the outgoing MTU
** to warn the user only if the outoing mtu is too small */
static char vrrp_hwaddr[6]; // WORK: lame hardcoded for ethernet
static vrrp_rt glob_vsrv; /* a global because used in the signal handler*/
/* Scott added 9-4-02 */
int master_ipaddr = 0;
static char PidDir[FILENAME_MAX+1];
static char scriptdown[FILENAME_MAX+1];
static char upscript[FILENAME_MAX+1];
uint32_t magicsipaddr;
char magicdipaddr[FILENAME_MAX+1];
FILE *f;
FILE *f2;
static time_t timenow;
static char *timenowstring;
int mypid;
/****************************************************************
NAME : Monitoring only
AIM :
REMARK :
****************************************************************/
char buff[80];
int max_monitor = 9;
char pidend[6] = ".pid";
// Path generated in main function
char pidfilepath[FILENAME_MAX+1];
char separetepath[2] = "/";
int monitor = 0;
int monitortemp = 0;
int pid = 0;
int ix = 0;
int maxrand = 10;
int nb = 0;
int retval = 0;
/* default delay */
int showdelay = 1;
char globalstatedown[FILENAME_MAX+1];
char statefilepath[FILENAME_MAX+1];
char statedown[FILENAME_MAX+1] = "/vrrpdstatedown_";
char statedownfilepath[FILENAME_MAX+1];
char backup_reason[FILENAME_MAX+1];
char master_reason[FILENAME_MAX+1];
char temp[FILENAME_MAX+1];
/****************************************************************
NAME : killvrrpd
AIM :
REMARK :
****************************************************************/
void killvrrpd(int killnu,char *ifname)
{
vrrp_rt *vsrv = &glob_vsrv;
char namepid[FILENAME_MAX+1]="vrrpd_";
int pidtab[max_monitor];
// Tab with 0 value
for (ix = 0 ; ix < max_monitor; ix++)
pidtab[ix] = 0;
ix=0;
// Search process pid //
DIR *currentDir;
struct dirent *fichier;
if( NULL == ( currentDir = opendir(PidDir))) {
perror( "opendir()" );
} else {
while( NULL != ( fichier = readdir( currentDir ))) {
if(!strncmp(namepid, fichier->d_name, 6) ){
if ((f = fopen(pidfilepath, "rb")) != NULL){
strcat(statefilepath,fichier->d_name);
fgets(buff, sizeof(buff), f);
fclose(f);
int pid2 = atoi(buff);
if (ix < max_monitor){
pidtab[ix] = pid2;
ix++;
}
statefilepath[0]='\0';
}
}
}
closedir(currentDir);
}
/* Search another process with Backup state */
for (ix=0; ix <= max_monitor; ix++) {
sprintf (&statedownfilepath[24],"%d",ix);
/* LOCK VRRPD PROCESS */
/* Backup myself */
if (killnu == 13){
/* DON'T REMOVE, DOUBLE "IF" AVOID UNDE FILES */
if ((f = fopen(statedownfilepath, "rb")) == NULL){
if ((strlen(globalstatedown) == 0)){
if (monitor){
f = fopen(statedownfilepath,"w");
fprintf(f, "%d", mypid );
killnu = 12;
/* Now record my previous state */
strcpy(globalstatedown,statedownfilepath);
fclose(f);
}
vsrv->wantstate = VRRP_STATE_INIT;
vsrv->state = VRRP_STATE_INIT;
return;
}
} else {
fclose(f);
}
}
if (killnu != 13) {
/* There is a already a process with a lock ? */
if ((f = fopen(statedownfilepath, "rb")) != NULL) {
fgets(buff, sizeof(buff), f);
fclose(f);
int pid = atoi(buff);
/* Another pid ? Switch to backup */
if (pid != mypid){
/* we remove process already backup */
for (ix = 0 ; ix < max_monitor; ix++){
if (pidtab[ix] == pid) {
pidtab[ix] = 0;
}
}
if ( vsrv->state != VRRP_STATE_BACK ){
kill(mypid,SIGUSR2);
vrrpd_log(LOG_WARNING, "VRRP ID %d on %s: Going to Backup state my PID: %d ",vsrv->vrid, ifname, mypid);
} else {
vsrv->wantstate = VRRP_STATE_INIT;
vsrv->state = VRRP_STATE_INIT;
}
}
}
}
/* End of loop all process found */
}
/* Now action ! You shall not pass ! */
for (ix = 0 ; ix < max_monitor ; ix++) {
if ((pidtab[ix] != 0) && (monitor)) {
sleep(1);
vrrpd_log(LOG_WARNING, "VRRP ID %d on %s: Send BACKUP STATE to VRRPD process PID: %d",vsrv->vrid, ifname, pidtab[ix]);
kill(pidtab[ix],SIGUSR2);
}
}
}
/****************************************************************
NAME : get_pid_name 00/10/04 21:06:44
AIM :
REMARK :
****************************************************************/
static char *pidfile_get_name( vrrp_rt *vsrv )
{
static char pidfile[FILENAME_MAX+1];
snprintf( pidfile, sizeof(pidfile), "%s/" VRRP_PID_FORMAT
, PidDir
, vsrv->vif.ifname );
return pidfile;
}
/****************************************************************
NAME : pidfile_write 00/10/04 21:12:26
AIM :
REMARK : write the pid file
****************************************************************/
static int pidfile_write( vrrp_rt *vsrv )
{
char *name = pidfile_get_name(vsrv);
FILE *fOut = fopen( name, "w" );
if( !fOut ){
fprintf( stderr, "Can't open %s (errno %d %s)\n", name
, errno
, strerror(errno)
);
return -1;
}
fprintf( fOut, "%d\n", mypid );
fclose( fOut );
return(0);
}
/****************************************************************
NAME : pidfile_rm 00/10/04 21:12:26
AIM :
REMARK :
****************************************************************/
static void pidfile_rm( vrrp_rt *vsrv )
{
unlink( pidfile_get_name(vsrv) );
if ((f = fopen(globalstatedown, "r")) != NULL) {
unlink(globalstatedown);
fclose(f);
}
// remove state file eg: /var/run/.vrrpstate456
unlink(statefilepath);
}
/****************************************************************
NAME : pidfile_exist 00/10/04 21:12:26
AIM : return 0 if there is no valid pid in the pidfile or no pidfile
REMARK :
****************************************************************/
static int pidfile_exist( vrrp_rt *vsrv )
{
char *name = pidfile_get_name(vsrv);
FILE *fIn = fopen( name, "r" );
pid_t pid;
/* if there is no file */
if( !fIn ) return 0;
fscanf( fIn, "%d", &pid );
fclose( fIn );
/* if there is no process, remove the stale file */
if( kill( pid, 0 ) ){
fprintf(stderr, "Remove a stale pid file %s\n", name );
pidfile_rm( vsrv );
return 0;
}
/* if the kill suceed, return an error */
return -1;
}
/****************************************************************
NAME : in_csum 00/05/10 20:12:20
AIM : compute a IP checksum
REMARK : from kuznet's iputils
****************************************************************/
static u_short in_csum( u_short *addr, int len, u_short csum)
{
register int nleft = len;
const u_short *w = addr;
register u_short answer;
register int sum = csum;
/*
* Our algorithm is simple, using a 32 bit accumulator (sum),
* we add sequential 16 bit words to it, and at the end, fold
* back all the carry bits from the top 16 bits into the lower
* 16 bits.
*/
while (nleft > 1) {
sum += *w++;
nleft -= 2;
}
/* mop up an odd byte, if necessary */
if (nleft == 1)
sum += htons(*(u_char *)w << 8);
/*
* add back carry outs from top 16 bits to low 16 bits
*/
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
sum += (sum >> 16); /* add carry */
answer = ~sum; /* truncate to 16 bits */
return (answer);
}
/****************************************************************
NAME : get_dev_from_ip 00/02/08 06:51:32
AIM :
REMARK :
****************************************************************/
static uint32_t ifname_to_ip( char *ifname )
{
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
uint32_t addr = 0;
if (fd < 0) return (-1);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) == 0) {
struct sockaddr_in *sin = (struct sockaddr_in *)&ifr.ifr_addr;
addr = ntohl(sin->sin_addr.s_addr);
}
close(fd);
return addr;
}
/****************************************************************
NAME : get_dev_from_ip 00/02/08 06:51:32
AIM :
REMARK :
****************************************************************/
static int ifname_to_idx( char *ifname )
{
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
int ifindex = -1;
if (fd < 0) return (-1);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFINDEX, (char *)&ifr) == 0)
ifindex = ifr.ifr_ifindex;
close(fd);
return ifindex;
}
/****************************************************************
NAME : rcvhwaddr_op 00/02/08 06:51:32
AIM :
REMARK :
****************************************************************/
static int rcvhwaddr_op( char *ifname, char *addr, int addrlen, int addF )
{
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
int ret;
if (fd < 0) return (-1);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
memcpy( ifr.ifr_hwaddr.sa_data, addr, addrlen );
ifr.ifr_hwaddr.sa_family = AF_UNSPEC;
ret = ioctl(fd, addF ? SIOCADDMULTI : SIOCDELMULTI, (char *)&ifr);
if( ret ){
printf("Can't %s on %s. errno=%d\n"
, addF ? "SIOCADDMULTI" : "SIOCDELMULTI"
, ifname, errno );
}
close(fd);
return ret;
}
/****************************************************************
NAME : hwaddr_set 00/02/08 06:51:32
AIM :
REMARK : linux refuse to change the hwaddress if the interface is up
****************************************************************/
static int hwaddr_set( char *ifname, char *addr, int addrlen )
{
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
int ret;
unsigned long flags;
if (fd < 0) return (-1);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
/* get the flags */
ret = ioctl(fd, SIOCGIFFLAGS, (char *)&ifr);
if( ret ) goto end;
flags = ifr.ifr_flags;
/* first we try to change the hwaddr */
memcpy( ifr.ifr_hwaddr.sa_data, addr, addrlen );
ifr.ifr_hwaddr.sa_family = AF_UNIX;
ret = ioctl(fd, SIOCSIFHWADDR, (char *)&ifr);
if( ret ) {
/* if there is a error */
/* set the interface down */
ifr.ifr_flags &= ~IFF_UP;
ret = ioctl(fd, SIOCSIFFLAGS, (char *)&ifr);
if( ret ) goto end;
/* change the hwaddr */
memcpy( ifr.ifr_hwaddr.sa_data, addr, addrlen );
ifr.ifr_hwaddr.sa_family = AF_UNIX;
ret = ioctl(fd, SIOCSIFHWADDR, (char *)&ifr);
if( ret ) goto end;
/* set the interface up */
ifr.ifr_flags = flags;
ret = ioctl(fd, SIOCSIFFLAGS, (char *)&ifr);
if( ret ) goto end;
}
end:;
if( ret ) vrrpd_log(LOG_WARNING, "Can't add Virtual Mac erreur: %d",errno );
close(fd);
return ret;
}
/****************************************************************
NAME : hwaddr_get 00/02/08 06:51:32
AIM :
REMARK :
****************************************************************/
static int hwaddr_get( char *ifname, char *addr, int addrlen )
{
struct ifreq ifr;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
int ret;
if (fd < 0) return (-1);
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
ret = ioctl(fd, SIOCGIFHWADDR, (char *)&ifr);
memcpy( addr, ifr.ifr_hwaddr.sa_data, addrlen );
//printf("%x:%x:%x:%x:%x:%x\n", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5] );
close(fd);
return ret;
}
/****************************************************************
NAME : ipaddr_ops 00/02/08 06:51:32
AIM :
REMARK :
****************************************************************/
static int ipaddr_ops( vrrp_rt *vsrv, int addF )
{
int i, err = 0;
int ifidx = ifname_to_idx( vsrv->vif.ifname );
/* struct in_addr in;
*/
for( i = 0; i < vsrv->naddr; i++ ){
vip_addr *vadd = &vsrv->vaddr[i];
if( !addF && !vadd->deletable ) continue;
if( ipaddr_op(ifidx , vadd->addr, vadd->length, addF)){
err = 1;
vadd->deletable = 0;
/*
in.s_addr = htonl(vadd->addr);
VRRP_LOG(("cant %s the address %s to %s\n"
, addF ? "set" : "remove"
, inet_ntoa(in)
, vsrv->vif.ifname));
*/
}else{
vadd->deletable = 1;
}
}
return err;
}
/****************************************************************
NAME : vrrp_dlthd_len 00/02/02 15:16:23
AIM : return the vrrp header size in byte
REMARK :
****************************************************************/
static int vrrp_dlt_len( vrrp_rt *rt )
{
return ETHER_HDR_LEN; /* hardcoded for ethernet */
}
/****************************************************************
NAME : vrrp_iphdr_len 00/02/02 15:16:23
AIM : return the ip header size in byte
REMARK :
****************************************************************/
static int vrrp_iphdr_len( vrrp_rt *vsrv )
{
return sizeof( struct iphdr );
}
/****************************************************************
NAME : vrrp_hd_len 00/02/02 15:16:23
AIM : return the vrrp header size in byte
REMARK :
****************************************************************/
static int vrrp_hd_len( vrrp_rt *vsrv )
{
return sizeof( vrrp_pkt ) + vsrv->naddr*sizeof(uint32_t)
+ VRRP_AUTH_LEN;
}
/****************************************************************
NAME : vrrp_in_chk 00/02/02 12:54:54
AIM : check a incoming packet. return 0 if the pkt is valid, != 0 else
REMARK : rfc2338.7.1
****************************************************************/
static int vrrp_in_chk( vrrp_rt *vsrv, struct iphdr *ip )
{
int ihl = ip->ihl << 2;
vrrp_pkt * hd = (vrrp_pkt *)((char *)ip + ihl);
vrrp_if *vif = &vsrv->vif;
/* MUST verify that the IP TTL is 255 */
if( ip->ttl != VRRP_IP_TTL ) {
VRRP_LOG(("invalid ttl. %d and expect %d", ip->ttl,VRRP_IP_TTL));
return 1;
}
/* MUST verify the VRRP version */
if( (hd->vers_type >> 4) != VRRP_VERSION ){
VRRP_LOG(("invalid version. %d and expect %d"
, (hd->vers_type >> 4), VRRP_VERSION));
return 1;
}
/* MUST verify that the received packet length is greater than or
** equal to the VRRP header */
if( (ntohs(ip->tot_len)-ihl) <= sizeof(vrrp_pkt) ){
VRRP_LOG(("ip payload too short. %d and expect at least %zu"
, ntohs(ip->tot_len)-ihl, sizeof(vrrp_pkt) ));
return 1;
}
/* WORK: MUST verify the VRRP checksum */
if( in_csum( (u_short*)hd, vrrp_hd_len(vsrv), 0) ){
VRRP_LOG(("Invalid vrrp checksum" ));
return 1;
}
/* MUST perform authentication specified by Auth Type */
/* MUST verify that the VRID is valid on the receiving interface */
if( vsrv->vrid != hd->vrid ){
return 1;
}
/* ok we have the same vid */
/* check the authentication if it is a passwd */
if( hd->auth_type == VRRP_AUTH_PASS ){
char *pw = (char *)ip + ntohs(ip->tot_len)
-sizeof(vif->auth_data);
if( memcmp( pw, vif->auth_data, sizeof(vif->auth_data)) ){
if( vsrv->vrid == hd->vrid ){
if ((vsrv->state = VRRP_STATE_BACK) || (vsrv->state = VRRP_STATE_INIT)){
vrrpd_log(LOG_WARNING,"VRRPD group: receive an invalid passwd ! \n");
vrrpd_log(LOG_WARNING,"passwd peer: %s passwd: %s - vid: %d from same vid: %d \n", pw, vif->auth_data, vsrv->vrid, hd->vrid);
sleep (2);
kill(mypid,SIGTERM);
} else {
vrrpd_log(LOG_WARNING,"VRRPD group: receive an invalid passwd ! \n");
vrrpd_log(LOG_WARNING,"passwd peer: %s passwd: %s - vid: %d from same vid: %d \n", pw, vif->auth_data, vsrv->vrid, hd->vrid);
}
return 2;
}
}
} else {
/* check the authentication type */
if( vif->auth_type != hd->auth_type ){
if ((vsrv->state = VRRP_STATE_BACK) || (vsrv->state = VRRP_STATE_INIT)){
killvrrpd(13, vsrv->vif.ifname );
vrrpd_log(LOG_WARNING,"VRRPD group: Vid: %d receive an invalid passwd type from peer \n", vsrv->vrid);
vrrpd_log(LOG_WARNING,"VRRPD group: Vid: %d receive a %d auth, expecting %d ! from %d \n", vsrv->vrid, vif->auth_type, hd->auth_type, hd->vrid);
sleep (2);
kill(mypid,SIGTERM);
} else {
vrrpd_log(LOG_WARNING,"VRRPD group: Vid: %d receive an invalid passwd type \n", vsrv->vrid);
vrrpd_log(LOG_WARNING,"VRRPD group: Vid: %d receive a %d auth, expecting %d ! from %d \n", vsrv->vrid, vif->auth_type, hd->auth_type, hd->vrid);
}
return 2;
}
}
/* MAY verify that the IP address(es) associated with the VRID are
** valid */
/* WORK: currently we don't */
/* MUST verify that the Adver Interval in the packet is the same as
** the locally configured for this virtual router */
if( vsrv->adver_int/VRRP_TIMER_HZ != hd->adver_int ){
VRRP_LOG(("advertissement interval mismatch mine=%d rcved=%d"
, vsrv->adver_int, hd->adver_int ));
return 1;
}
/* Scott added 9-4-02 */
master_ipaddr = ip->saddr;
return 0;
}
/****************************************************************
NAME : vrrp_build_dlt 00/02/02 14:39:18
AIM :
REMARK : rfc2338.7.3
****************************************************************/
static void vrrp_build_dlt( vrrp_rt *vsrv, char *buffer, int buflen )
{
/* hardcoded for ethernet */
struct ether_header * eth = (struct ether_header *)buffer;
/* destination address --rfc1122.6.4*/
eth->ether_dhost[0] = 0x01;
eth->ether_dhost[1] = 0x00;
eth->ether_dhost[2] = 0x5E;
eth->ether_dhost[3] = (INADDR_VRRP_GROUP >> 16) & 0x7F;
eth->ether_dhost[4] = (INADDR_VRRP_GROUP >> 8) & 0xFF;
eth->ether_dhost[5] = INADDR_VRRP_GROUP & 0xFF;
/* source address --rfc2338.7.3 */
memcpy( eth->ether_shost, vrrp_hwaddr, sizeof(vrrp_hwaddr));
/* type */
eth->ether_type = htons( ETHERTYPE_IP );
}
/****************************************************************
NAME : vrrp_build_ip 00/02/02 14:39:18
AIM : build a ip packet
REMARK :
****************************************************************/
static void vrrp_build_ip( vrrp_rt *vsrv, char *buffer, int buflen )
{
struct iphdr * ip = (struct iphdr *)(buffer);
ip->ihl = 5;
ip->version = 4;
ip->tos = 0;
ip->tot_len = ip->ihl*4 + vrrp_hd_len( vsrv );
ip->tot_len = htons(ip->tot_len);
ip->id = ++ip_id;
ip->frag_off = 0;
ip->ttl = VRRP_IP_TTL;
ip->protocol = IPPROTO_VRRP;
ip->saddr = htonl(vsrv->vif.ipaddr);
ip->daddr = htonl(INADDR_VRRP_GROUP);
/* checksum must be done last */
ip->check = in_csum( (u_short*)ip, ip->ihl*4, 0 );
}
/****************************************************************
NAME : vrrp_build_vrrp 00/02/02 14:39:18
AIM :
REMARK :
****************************************************************/
static int vrrp_build_vrrp( vrrp_rt *vsrv, int prio, char *buffer, int buflen )
{
int i;
vrrp_if *vif = &vsrv->vif;
vrrp_pkt *hd = (vrrp_pkt *)buffer;
uint32_t *iparr = (uint32_t *)((char *)hd+sizeof(*hd));
hd->vers_type = (VRRP_VERSION<<4) | VRRP_PKT_ADVERT;
hd->vrid = vsrv->vrid;
hd->priority = prio;
hd->naddr = vsrv->naddr;
hd->auth_type = vsrv->vif.auth_type;
hd->adver_int = vsrv->adver_int/VRRP_TIMER_HZ;
/* copy the ip addresses */
for( i = 0; i < vsrv->naddr; i++ ){
iparr[i] = htonl( vsrv->vaddr[i].addr );
}
/* copy the passwd if the authentication is VRRP_AH_PASS */
if( vif->auth_type == VRRP_AUTH_PASS ){
char *pw = (char *)hd+sizeof(*hd)+vsrv->naddr*4;
memcpy( pw, vif->auth_data, sizeof(vif->auth_data));
}
/* Must perform the checksum AFTER we copy the password */
hd->chksum = in_csum( (u_short*)hd, vrrp_hd_len(vsrv), 0);
return(0);
}
/****************************************************************
NAME : vrrp_set_ptk 00/02/02 13:33:32
AIM : build a advertissement packet
REMARK :
****************************************************************/
static void vrrp_build_pkt( vrrp_rt *vsrv, int prio, char *buffer, int buflen )
{
// printf("dltlen=%d iplen=%d", vrrp_dlt_len(vsrv), vrrp_iphdr_len(vsrv) );
/* build the ethernet header */
vrrp_build_dlt( vsrv, buffer, buflen );
buffer += vrrp_dlt_len(vsrv);
buflen -= vrrp_dlt_len(vsrv);
/* build the ip header */
vrrp_build_ip( vsrv, buffer, buflen );
buffer += vrrp_iphdr_len(vsrv);
buflen -= vrrp_iphdr_len(vsrv);
/* build the vrrp header */
vrrp_build_vrrp( vsrv, prio, buffer, buflen );
}
/****************************************************************
NAME : vrrp_send_pkt 00/02/06 16:37:10
AIM :
REMARK :
****************************************************************/
static int vrrp_send_pkt( vrrp_rt *vsrv, char *buffer, int buflen )
{
struct sockaddr from;
int len;
int fd = socket(PF_PACKET, SOCK_PACKET, 0x300); /* 0x300 is magic */
// WORK:
if( fd < 0 ){
perror( "socket" );
return -1;
}
/* build the address */
memset( &from, 0 , sizeof(from));
strcpy( from.sa_data, vsrv->vif.ifname );
/* send the data */
len = sendto( fd, buffer, buflen, 0, &from, sizeof(from) );
//printf("len=%d\n",len);
close( fd );
return len;
}
/****************************************************************
NAME : hello_send_pkt
AIM :
REMARK :
****************************************************************/
void hello_send_pkt(vrrp_rt *vsrv, int addr)
{
struct sockaddr_in stSockAddr;
int Res;
int SocketFD = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
fcntl(SocketFD, F_SETFL, O_NONBLOCK);
if (-1 == SocketFD)
{
perror("cannot create socket");
}
memset(&stSockAddr, 0, sizeof(stSockAddr));
stSockAddr.sin_addr.s_addr = magicsipaddr;
vrrpd_log(LOG_WARNING, "VRRP ID %d: sending magic packet \n",vsrv->vrid);
if (-1 == bind(SocketFD,(struct sockaddr *)&stSockAddr, sizeof(stSockAddr)))
{
perror("error bind failed");
close(SocketFD);
return;
}
stSockAddr.sin_family = AF_INET;
stSockAddr.sin_port = htons(1100);
Res = inet_pton(AF_INET, magicdipaddr, &stSockAddr.sin_addr);
if (0 > Res){
perror("error: first parameter is not a valid address family");
close(SocketFD);
return;
} else if (0 == Res){
perror("char string (second parameter does not contain valid ipaddress)");
close(SocketFD);
return;
}
if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(stSockAddr))){
close(SocketFD);
return;
}
shutdown(SocketFD, SHUT_RDWR);
close(SocketFD);
return;
}
/****************************************************************
NAME : vrrp_send_adv 00/02/06 16:31:24
AIM :
REMARK :
****************************************************************/
static int vrrp_send_adv( vrrp_rt *vsrv, int prio )
{
int buflen, ret;
char * buffer;
#if 0 /* just for debug */
struct in_addr in;
in.s_addr = htonl(vsrv->vif.ipaddr);
printf("send an advertissement on %s\n",inet_ntoa(in) );
#endif
/* alloc the memory */
buflen = vrrp_dlt_len(vsrv) + vrrp_iphdr_len(vsrv) + vrrp_hd_len(vsrv);
buffer = calloc( buflen, 1 );
assert( buffer );
/* build the packet */
vrrp_build_pkt( vsrv, prio, buffer, buflen );
/* send it */
ret = vrrp_send_pkt( vsrv, buffer, buflen );
/* build the memory */
free( buffer );
return ret;
}
/****************************************************************
NAME : usage 00/02/06 08:50:28
AIM : display the usage
REMARK :
****************************************************************/
static void usage( void )
{
fprintf( stderr, "vrrpd version %s\n", VRRPD_VERSION );
fprintf( stderr, "Usage: vrrpd -i ifname -v vrid [ -M monitor ] [-s] [-a auth] [-p prio] [-z prio] [-x prio] [-nh] ipaddr\n" );
fprintf( stderr, " -h : display this short inlined help\n" );
fprintf( stderr, " -n : Dont handle the virtual mac address\n" );
fprintf( stderr, " -i ifname: the interface name to run on\n" );
fprintf( stderr, " -v vrid : the id of the virtual server [1-255]\n" );
fprintf( stderr, " -s : Switch the preemption mode (%s by default)\n"
, VRRP_PREEMPT_DFL? "Enabled" : "Disabled" );
fprintf( stderr, " -a auth : auth=(none|pw/hexkey|ah/hexkey) hexkey=0x[0-9a-fA-F]+\n");
fprintf( stderr, " -p prio : Set the priority of this host in the virtual server (dfl: %d)\n"
, VRRP_PRIO_DFL );
fprintf( stderr, " -d delay : Set the advertisement interval (in sec) (dfl: %d)\n"
, VRRP_ADVER_DFL );
fprintf( stderr, " -z prio : Set the priority after SIGTTIN (not decrement as default)\n");
fprintf( stderr, " -x prio : Set the priority after SIGTTOU (not increment as default)\n");
fprintf( stderr, " ipaddr/length : Should be at the end - IP address(es) of the virtual server and the length of the subnet mask - \n" );
fprintf( stderr, " -V : display version\n\n" );
fprintf( stderr, " ---------------------------------------------------------------------------\n");
fprintf( stderr, " Frederic Bourgeois web: http://numsys.eu code: https://github.com/fredbcode/Vrrpd\n");
fprintf( stderr, " Based on (http://sourceforge.net/projects/vrrpd/)\n\n");
fprintf( stderr, " Supplementary Options: \n");
fprintf( stderr, " -U : (-U <file>): run <file> to become a master)\n");
fprintf( stderr, " -D : (-D <file>): run <file> to become a backup)\n");
fprintf( stderr, " -M : (-M x) Monitoring process and Network (Max 9)\n");
fprintf( stderr, " If one vrrpd become backup (or died), all other process go to Backup state\n");
fprintf( stderr, " If one network interface failed (ifconfig Down, link) all other process go to Backup state\n");
fprintf( stderr, " Not supported (in part or whole) on all ethernet drivers\n\n");
fprintf( stderr, " POWER USERS --------------------------------------------------------------\n");
fprintf( stderr, " Magic packet erase arp table (for those who work without vmac - send fake packet to port 1100 -)\n");
fprintf( stderr, " -I ipvip : Choose VIP source to send magic packet - Erase vip from mac table -\n");
fprintf( stderr, " -O ipdst : Gateway destination\n");
fprintf( stderr, " Example: vrrpd -i eth0 -v 11 10.1.1.1 -I 10.1.1.1 -O 10.1.1.254\n");
fprintf( stderr, "\n");
}
/****************************************************************
NAME : parse_authopt 00/09/26 22:01:17
AIM :
REMARK : parse the authentication option from the user
****************************************************************/
static int parse_authopt(vrrp_rt *vsrv, char *str)
{
int len = strlen(str);
vrrp_if *vif = &vsrv->vif;
vif->auth_type = VRRP_AUTH_NONE;
/* epxlicitly no authentication */
if( !strcmp(str,"none") ) return 0;
/* below the min len */
if( len < 5 ) return -1;
/* check the type of authentication */
if( !strncmp(str, "ah/0x", 5 ) ){
vif->auth_type = VRRP_AUTH_AH;
return -1; /* WORK: not yet implemented */
#if 0 // I don't know what he was trying to do here! -- Scott 9-6-02
}else if( !strncmp(str, "pw/", 5 ) ){
int i,j;
vif->auth_type = VRRP_AUTH_PASS;
memset( vif->auth_data, 0, sizeof(vif->auth_data) );
/* parse the key */
for( i=5,j=0; j < sizeof(vif->auth_data)*2 && i<len ;i++,j++ ){
/* sanity check */
if( !isxdigit(str[i]) ) return -1;
str[i] = toupper(str[i]);
if( str[i] >= 'A' ) str[i] -= 'A' - 10;
else str[i] -= '0';
vif->auth_data[j/2] |= str[i] << (j&1 ? 0 : 4 );
//WORK: printf(" j=%d c=%d 0x%x\n",j,str[i],vif->auth_data[j/2]);
}
if( i != len ) return -1;
#endif
}else if( !strncmp(str, "pw/", 3 ) ){
vif->auth_type = VRRP_AUTH_PASS;
// Must set unused bytes to 0
memset (vif->auth_data, 0, sizeof(vif->auth_data) );
// Simply copy up to 8 characters
if (len > 11)
len = 11;
memcpy (vif->auth_data, &str[3], len - 3);
}else{
return -1;
}
return(0);
}
/****************************************************************
NAME : ethtool
AIM :
REMARK :
****************************************************************/
int detect_ethtool(int skfd, char *ifname)
{
struct ifreq ifr;
struct ethtool_value edata;
memset(&ifr, 0, sizeof(ifr));
edata.cmd = ETHTOOL_GLINK;
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)-1);
ifr.ifr_data = (char *) &edata;
if (ioctl(skfd, SIOCETHTOOL, &ifr) == -1){
return 2;
}
return (edata.data ? 0 : 1);
}
/****************************************************************
NAME : parse_cmdline 00/02/06 09:09:11
AIM :
REMARK :
****************************************************************/
static int parse_cmdline( vrrp_rt *vsrv, int argc, char *argv[] )
{
vrrp_if *vif = &vsrv->vif;
int c;
while( 1 ){
c = getopt( argc, argv, "f:M:Vhnsi:v:a:p:z:x:d:D:U:I:O:" );
/* if the parsing is completed, exit */
if( c == EOF ) break;
switch( c ){
case 'n':
vsrv->no_vmac = 1;
break;
case 's':
vsrv->preempt = !vsrv->preempt;
break;
case 'f':
snprintf( PidDir, sizeof(PidDir), "%s", optarg );
break;
case 'i':
vif->ifname = strdup( optarg );
/* get the ip address */
vif->ipaddr = ifname_to_ip( optarg );
if( !vif->ipaddr ){
fprintf( stderr, "no interface found!\n" );
goto err;
}
/* get the hwaddr */
if( hwaddr_get( vif->ifname, vif->hwaddr
, sizeof(vif->hwaddr)) ){
fprintf( stderr, "Can't read the hwaddr on this interface!\n" );
goto err;
}
break;
case 'v':
vsrv->vrid = atoi( optarg );
if( VRRP_IS_BAD_VID(vsrv->vrid) ){
fprintf( stderr, "bad vrid!\n" );
goto err;
}
vrrp_hwaddr[0] = 0x00;
vrrp_hwaddr[1] = 0x00;
vrrp_hwaddr[2] = 0x5E;
vrrp_hwaddr[3] = 0x00;
vrrp_hwaddr[4] = 0x01;
vrrp_hwaddr[5] = vsrv->vrid;
break;
case 'a':
if( parse_authopt( vsrv, optarg ) ){
fprintf( stderr, "Invalid authentication key!\n" );
goto err;
}
break;
case 'p':
vsrv->priority = atoi( optarg );
if( VRRP_IS_BAD_PRIORITY(vsrv->priority) ){
fprintf( stderr, "bad priority!\n" );
goto err;
}
break;