diff options
Diffstat (limited to 'ipsend/arp.c')
| -rw-r--r-- | ipsend/arp.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/ipsend/arp.c b/ipsend/arp.c new file mode 100644 index 0000000..d5497ef --- /dev/null +++ b/ipsend/arp.c @@ -0,0 +1,142 @@ +/* + * arp.c (C) 1995-1998 Darren Reed + * + * See the IPFILTER.LICENCE file for details on licencing. + */ +#if !defined(lint) +static const char sccsid[] = "@(#)arp.c 1.4 1/11/96 (C)1995 Darren Reed"; +static const char rcsid[] = "@(#)$Id: arp.c,v 2.8.2.2 2007/02/17 12:41:50 darrenr Exp $"; +#endif +#include <sys/types.h> +#include <sys/socket.h> +#if !defined(ultrix) && !defined(hpux) && !defined(__hpux) && !defined(__osf__) && !defined(_AIX51) +# include <sys/sockio.h> +#endif +#include <sys/ioctl.h> +#include <netinet/in_systm.h> +#include <netinet/in.h> +#ifdef __osf__ +# include "radix_ipf_local.h" +#endif +#include <net/if.h> +#include <netinet/if_ether.h> +#ifndef ultrix +# include <net/if_arp.h> +#endif +#include <netinet/in.h> +#include <netinet/ip.h> +#include <netinet/ip_var.h> +#include <netinet/tcp.h> +#include <stdio.h> +#include <errno.h> +#include <netdb.h> +#include "ipsend.h" +#include "iplang/iplang.h" + + +/* + * lookup host and return + * its IP address in address + * (4 bytes) + */ +int resolve(host, address) +char *host, *address; +{ + struct hostent *hp; + u_long add; + + add = inet_addr(host); + if (add == -1) + { + if (!(hp = gethostbyname(host))) + { + fprintf(stderr, "unknown host: %s\n", host); + return -1; + } + bcopy((char *)hp->h_addr, (char *)address, 4); + return 0; + } + bcopy((char*)&add, address, 4); + return 0; +} + +/* + * ARP for the MAC address corresponding + * to the IP address. This taken from + * some BSD program, I cant remember which. + */ +int arp(ip, ether) +char *ip; +char *ether; +{ + static int sfd = -1; + static char ethersave[6], ipsave[4]; + struct arpreq ar; + struct sockaddr_in *sin, san; + struct hostent *hp; + int fd; + +#ifdef IPSEND + if (arp_getipv4(ip, ether) == 0) + return 0; +#endif + if (!bcmp(ipsave, ip, 4)) { + bcopy(ethersave, ether, 6); + return 0; + } + fd = -1; + bzero((char *)&ar, sizeof(ar)); + sin = (struct sockaddr_in *)&ar.arp_pa; + sin->sin_family = AF_INET; + bcopy(ip, (char *)&sin->sin_addr.s_addr, 4); +#ifndef hpux + if ((hp = gethostbyaddr(ip, 4, AF_INET))) +# if SOLARIS && (SOLARIS2 >= 10) + if (!(ether_hostton(hp->h_name, (struct ether_addr *)ether))) +# else + if (!(ether_hostton(hp->h_name, ether))) +# endif + goto savearp; +#endif + + if (sfd == -1) + if ((sfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) + { + perror("arp: socket"); + return -1; + } +tryagain: + if (ioctl(sfd, SIOCGARP, (caddr_t)&ar) == -1) + { + if (fd == -1) + { + bzero((char *)&san, sizeof(san)); + san.sin_family = AF_INET; + san.sin_port = htons(1); + bcopy(ip, &san.sin_addr.s_addr, 4); + fd = socket(AF_INET, SOCK_DGRAM, 0); + (void) sendto(fd, ip, 4, 0, + (struct sockaddr *)&san, sizeof(san)); + sleep(1); + (void) close(fd); + goto tryagain; + } + fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr)); + if (errno != ENXIO) + perror("SIOCGARP"); + return -1; + } + + if ((ar.arp_ha.sa_data[0] == 0) && (ar.arp_ha.sa_data[1] == 0) && + (ar.arp_ha.sa_data[2] == 0) && (ar.arp_ha.sa_data[3] == 0) && + (ar.arp_ha.sa_data[4] == 0) && (ar.arp_ha.sa_data[5] == 0)) { + fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr)); + return -1; + } + + bcopy(ar.arp_ha.sa_data, ether, 6); +savearp: + bcopy(ether, ethersave, 6); + bcopy(ip, ipsave, 4); + return 0; +} |
