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- /*
- * $Id: snoop.c,v 1.1.1.1 1999/05/18 15:33:42 dugsong Exp $
- *
- * libnet
- * snoop.c
- *
- * Copyright (c) 1998, 1999 Mike D. Schiffman <mike@infonexus.com>
- * route|daemon9 <route@infonexus.com>
- * All rights reserved.
- *
- * Copyright (c) 1993, 1994, 1995, 1996, 1997
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that: (1) source code distributions
- * retain the above copyright notice and this paragraph in its entirety, (2)
- * distributions including binary code include the above copyright notice and
- * this paragraph in its entirety in the documentation or other materials
- * provided with the distribution, and (3) all advertising materials mentioning
- * features or use of this software display the following acknowledgement:
- * ``This product includes software developed by the University of California,
- * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
- * the University nor the names of its contributors may be used to endorse
- * or promote products derived from this software without specific prior
- * written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #include <sys/param.h>
- #include <sys/file.h>
-
- #if (HAVE_CONFIG_H)
- #include "../include/config.h"
- #endif
- #include "../include/libnet.h"
-
- #include <net/raw.h>
- #include <net/if.h>
-
- #include <netinet/ip_var.h>
- #include <netinet/if_ether.h>
- #include <netinet/udp_var.h>
- #include <netinet/tcpip.h>
-
- #include "../include/gnuc.h"
- #include "../include/bpf.h"
- #ifdef HAVE_OS_PROTO_H
- #include "../include/os-proto.h"
- #endif
-
-
- struct link_int *
- open_link_interface(char *device, char *ebuf)
- {
- int fd;
- struct sockaddr_raw sr;
- u_int v;
- struct link_int *l;
-
- l = (struct link_int *)malloc(sizeof(*l));
- if (l == NULL)
- {
- sprintf(ebuf, "malloc: %s", ll_strerror(errno));
- return (NULL);
- }
- memset(l, 0, sizeof(*l));
- l->fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_DRAIN);
- if (l->fd < 0)
- {
- sprintf(ebuf, "drain socket: %s", ll_strerror(errno));
- goto bad;
- }
-
- memset(&sr, 0, sizeof(sr));
- sr.sr_family = AF_RAW;
- strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname));
-
- if (bind(l->fd, (struct sockaddr *)&sr, sizeof(sr)))
- {
- sprintf(ebuf, "drain bind: %s", ll_strerror(errno));
- goto bad;
- }
-
- /*
- * XXX hack - map device name to link layer type
- */
- if (strncmp("et", device, 2) == 0 || /* Challenge 10 Mbit */
- strncmp("ec", device, 2) == 0 || /* Indigo/Indy 10 Mbit, O2 10/100 */
- strncmp("ef", device, 2) == 0 || /* O200/2000 10/100 Mbit */
- strncmp("gfe", device, 3) == 0 || /* GIO 100 Mbit */
- strncmp("fxp", device, 3) == 0 || /* Challenge VME Enet */
- strncmp("ep", device, 2) == 0 || /* Challenge 8x10 Mbit EPLEX */
- strncmp("vfe", device, 3) == 0 || /* Challenge VME 100Mbit */
- strncmp("fa", device, 2) == 0 ||
- strncmp("qaa", device, 3) == 0)
- {
- l->linktype = DLT_EN10MB;
- }
- else if (strncmp("ipg", device, 3) == 0 ||
- strncmp("rns", device, 3) == 0 || /* O2/200/2000 FDDI */
- strncmp("xpi", device, 3) == 0)
- {
- l->linktype = DLT_FDDI;
- }
- else if (strncmp("ppp", device, 3) == 0) {
- l->linktype = DLT_RAW;
- } else if (strncmp("lo", device, 2) == 0) {
- l->linktype = DLT_NULL;
- } else {
- sprintf(ebuf, "drain: unknown physical layer type");
- goto bad;
- }
-
- return (l);
- bad:
- close(fd);
- free(l);
- return (NULL);
- }
-
-
- int
- close_link_interface(struct link_int *l)
- {
- return (close(l->fd));
- }
-
-
- int
- write_link_layer(struct link_int *l, const u_char *device, u_char *buf, int len)
- {
- int c;
- struct ifreq ifr;
- struct ether_header *eh = (struct ether_header *)buf;
-
- memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
-
- if (ioctl(l->fd, SIOCGIFADDR, &ifr) == -1)
- {
- perror("ioctl SIOCGIFADDR");
- return (-1);
- }
-
- memcpy(eh->ether_shost, ifr.ifr_addr.sa_data, sizeof(eh->ether_shost));
-
- if (write(l->fd, buf, len) == -1)
- {
- #if (__DEBUG)
- fprintf(stderr, "write_link_layer: (%s)\n", strerror(errno));
- #endif
- return (-1);
- }
-
- return (len);
- }
-