diff options
Diffstat (limited to 'ipsend/larp.c')
-rw-r--r-- | ipsend/larp.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/ipsend/larp.c b/ipsend/larp.c new file mode 100644 index 0000000..3d0c89c --- /dev/null +++ b/ipsend/larp.c @@ -0,0 +1,91 @@ +/* + * larp.c (C) 1995-1998 Darren Reed + * + * See the IPFILTER.LICENCE file for details on licencing. + * + */ +#if !defined(lint) +static const char sccsid[] = "@(#)larp.c 1.1 8/19/95 (C)1995 Darren Reed"; +static const char rcsid[] = "@(#)$Id: larp.c,v 2.4 2003/12/01 02:01:16 darrenr Exp $"; +#endif +#include <sys/param.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <netinet/in.h> +#include <net/if.h> +#include <net/if_arp.h> +#include <stdio.h> +#include <netdb.h> +#include <errno.h> + +#include "ip_compat.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 s = -1; + struct arpreq ar; + struct sockaddr_in *sin; + char *inet_ntoa(); + +#ifdef IP_SEND + if (arp_getipv4(ip, ether) == 0) + return 0; +#endif + 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); + + if (s == -1) + if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1) + { + perror("arp: socket"); + return -1; + } + + if (ioctl(s, SIOCGARP, (caddr_t)&ar) == -1) + { + fprintf(stderr, "(%s):", inet_ntoa(sin->sin_addr)); + if (errno != ENXIO) + perror("SIOCGARP"); + return -1; + } + + bcopy(ar.arp_ha.sa_data, ether, 6); + return 0; +} |