diff options
Diffstat (limited to 'libnet/src/libnet_link_pf.c')
| -rw-r--r-- | libnet/src/libnet_link_pf.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/libnet/src/libnet_link_pf.c b/libnet/src/libnet_link_pf.c new file mode 100644 index 0000000..533608e --- /dev/null +++ b/libnet/src/libnet_link_pf.c @@ -0,0 +1,164 @@ +/* + * $Id: libnet_link_pf.c,v 1.3 2004/01/03 20:31:02 mike Exp $ + * + * libnet + * libnet_pf.c - pf routines + * + * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + * All rights reserved. + * + * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 + * 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. + * + * packet filter subroutines for tcpdump + * Extraction/creation by Jeffrey Mogul, DECWRL + */ + +#if (HAVE_CONFIG_H) +#include "../include/config.h" +#endif +#include "../include/low_libnet.h" + +#include "../include/gnuc.h" +#ifdef HAVE_OS_PROTO_H +#include "../include/os-proto.h" +#endif + +struct libnet_link_int * +libnet_open_link_interface(int8_t *device, int8_t *ebuf) +{ + register struct libnet_link_int *l; + int16_t enmode; + int backlog = -1; /* request the most */ + struct enfilter Filter; + struct endevp devparams; + + l = (struct libnet_link_int *)malloc(sizeof(*l)); + if (l == NULL) + { + sprintf(ebuf, "libnet_open_link_int: %s", strerror(errno)); + return (0); + } + memset(l, 0, sizeof(*l)); + l->fd = pfopen(device, O_RDWR); + if (l->fd < 0) + { + sprintf(ebuf, "pf open: %s: %s\n\your system may not be properly configured; see \"man packetfilter(4)\"\n", + device, strerror(errno)); + goto bad; + } + + enmode = ENTSTAMP|ENBATCH|ENNONEXCL; + if (ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode) < 0) + { + sprintf(ebuf, "EIOCMBIS: %s", strerror(errno)); + goto bad; + } +#ifdef ENCOPYALL + /* Try to set COPYALL mode so that we see packets to ourself */ + enmode = ENCOPYALL; + ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode); /* OK if this fails */ +#endif + /* set the backlog */ + if (ioctl(l->fd, EIOCSETW, (caddr_t)&backlog) < 0) + { + sprintf(ebuf, "EIOCSETW: %s", strerror(errno)); + goto bad; + } + /* + * discover interface type + */ + if (ioctl(l->fd, EIOCDEVP, (caddr_t)&devparams) < 0) + { + sprintf(ebuf, "EIOCDEVP: %s", strerror(errno)); + goto bad; + } + + /* HACK: to compile prior to Ultrix 4.2 */ +#ifndef ENDT_FDDI +#define ENDT_FDDI 4 +#endif + switch (devparams.end_dev_type) + { + case ENDT_10MB: + l->linktype = DLT_EN10MB; + break; + case ENDT_FDDI: + l->linktype = DLT_FDDI; + break; + default: + /* + * XXX + * Currently, the Ultrix packet filter supports only + * Ethernet and FDDI. Eventually, support for SLIP and PPP + * (and possibly others: T1?) should be added. + */ + l->linktype = DLT_EN10MB; + break; + } + /* + * acceptag all packets + */ + bzero((int8_t *)&Filter, sizeof(Filter)); + Filter.enf_Priority = 37; /* anything > 2 */ + Filter.enf_FilterLen = 0; /* means "always true" */ + if (ioctl(l->fd, EIOCSETF, (caddr_t)&Filter) < 0) + { + sprintf(ebuf, "EIOCSETF: %s", strerror(errno)); + goto bad; + } + + return (l); +bad: + free(l); + return (NULL); +} + + +int +libnet_close_link_interface(struct libnet_link_int *l) +{ + if (close(l->fd) == 0) + { + free(l); + return (1); + } + else + { + free(l); + return (-1); + } +} + + +int +libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device, + const u_int8_t *buf, int len) +{ + int c; + + c = write(l->fd, buf, len); + if (c != len) + { + snprintf(l->err_buf, LIBNET_ERRBUF_SIZE, + "libnet_write_link: %d bytes written (%s)\n", c, + strerror(errno)); + } + return (c); +} |