1145519Sdarrenr/* $FreeBSD$ */ 2145510Sdarrenr 322514Sdarrenr/* 453024Sguido * (C)opyright 1992-1998 Darren Reed. (from tcplog) 522514Sdarrenr * 680486Sdarrenr * See the IPFILTER.LICENCE file for details on licencing. 7145510Sdarrenr * 822514Sdarrenr */ 922514Sdarrenr 1022514Sdarrenr#include <stdio.h> 1122514Sdarrenr#include <netdb.h> 1222514Sdarrenr#include <ctype.h> 1322514Sdarrenr#include <signal.h> 1422514Sdarrenr#include <errno.h> 1522514Sdarrenr#include <sys/types.h> 1622514Sdarrenr#include <sys/time.h> 1722514Sdarrenr#include <sys/timeb.h> 1822514Sdarrenr#include <sys/socket.h> 1922514Sdarrenr#include <sys/file.h> 2022514Sdarrenr#include <sys/ioctl.h> 2122514Sdarrenr#include <net/nit.h> 2222514Sdarrenr#include <sys/fcntlcom.h> 2322514Sdarrenr#include <sys/dir.h> 2422514Sdarrenr#include <net/nit_if.h> 2522514Sdarrenr#include <net/nit_pf.h> 2622514Sdarrenr#include <net/nit_buf.h> 2722514Sdarrenr#include <net/packetfilt.h> 2822514Sdarrenr#include <sys/stropts.h> 2922514Sdarrenr 3022514Sdarrenr#include <net/if.h> 3122514Sdarrenr#include <netinet/in.h> 3222514Sdarrenr#include <netinet/in_systm.h> 3322514Sdarrenr#include <netinet/ip.h> 3422514Sdarrenr#include <netinet/if_ether.h> 3522514Sdarrenr#include <netinet/ip_var.h> 3622514Sdarrenr#include <netinet/udp.h> 3722514Sdarrenr#include <netinet/udp_var.h> 3822514Sdarrenr#include <netinet/tcp.h> 3922514Sdarrenr 4024583Sdarrenr#include "ipsend.h" 4124583Sdarrenr 4231183Speter#if !defined(lint) 4331183Speterstatic const char sccsid[] = "@(#)snit.c 1.5 1/11/96 (C)1995 Darren Reed"; 44153881Sguidostatic const char rcsid[] = "@(#)$Id: snit.c,v 2.3 2001/06/09 17:09:26 darrenr Exp $"; 4522514Sdarrenr#endif 4622514Sdarrenr 4722514Sdarrenr#define CHUNKSIZE 8192 4822514Sdarrenr#define BUFSPACE (4*CHUNKSIZE) 4922514Sdarrenr 5022514Sdarrenr/* 5122514Sdarrenr * Be careful to only include those defined in the flags option for the 5222514Sdarrenr * interface are included in the header size. 5322514Sdarrenr */ 5422514Sdarrenr#define BUFHDR_SIZE (sizeof(struct nit_bufhdr)) 5522514Sdarrenr#define NIT_HDRSIZE (BUFHDR_SIZE) 5622514Sdarrenr 5722514Sdarrenrstatic int timeout; 5822514Sdarrenr 5922514Sdarrenr 60145510Sdarrenrint initdevice(device, tout) 6122514Sdarrenrchar *device; 62145510Sdarrenrint tout; 6322514Sdarrenr{ 6422514Sdarrenr struct strioctl si; 6522514Sdarrenr struct timeval to; 6622514Sdarrenr struct ifreq ifr; 6722514Sdarrenr int fd; 6822514Sdarrenr 6922514Sdarrenr if ((fd = open("/dev/nit", O_RDWR)) < 0) 7022514Sdarrenr { 7122514Sdarrenr perror("/dev/nit"); 7222514Sdarrenr exit(-1); 7322514Sdarrenr } 7422514Sdarrenr 7522514Sdarrenr /* 7622514Sdarrenr * arrange to get messages from the NIT STREAM and use NIT_BUF option 7722514Sdarrenr */ 7822514Sdarrenr ioctl(fd, I_SRDOPT, (char*)RMSGD); 7922514Sdarrenr ioctl(fd, I_PUSH, "nbuf"); 8022514Sdarrenr 8122514Sdarrenr /* 8222514Sdarrenr * set the timeout 8322514Sdarrenr */ 8422514Sdarrenr timeout = tout; 8522514Sdarrenr si.ic_timout = 1; 8622514Sdarrenr to.tv_sec = 1; 8722514Sdarrenr to.tv_usec = 0; 8822514Sdarrenr si.ic_cmd = NIOCSTIME; 8922514Sdarrenr si.ic_len = sizeof(to); 9022514Sdarrenr si.ic_dp = (char*)&to; 9122514Sdarrenr if (ioctl(fd, I_STR, (char*)&si) == -1) 9222514Sdarrenr { 9322514Sdarrenr perror("ioctl: NIT timeout"); 9422514Sdarrenr exit(-1); 9522514Sdarrenr } 9622514Sdarrenr 9722514Sdarrenr /* 9822514Sdarrenr * request the interface 9922514Sdarrenr */ 10022514Sdarrenr strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 10122514Sdarrenr ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' '; 10222514Sdarrenr si.ic_cmd = NIOCBIND; 10322514Sdarrenr si.ic_len = sizeof(ifr); 10422514Sdarrenr si.ic_dp = (char*)𝔦 10522514Sdarrenr if (ioctl(fd, I_STR, (char*)&si) == -1) 10622514Sdarrenr { 10722514Sdarrenr perror(ifr.ifr_name); 10822514Sdarrenr exit(1); 10922514Sdarrenr } 11022514Sdarrenr return fd; 11122514Sdarrenr} 11222514Sdarrenr 11322514Sdarrenr 11422514Sdarrenr/* 11522514Sdarrenr * output an IP packet onto a fd opened for /dev/nit 11622514Sdarrenr */ 11722514Sdarrenrint sendip(fd, pkt, len) 11822514Sdarrenrint fd, len; 11922514Sdarrenrchar *pkt; 12022514Sdarrenr{ 12122514Sdarrenr struct sockaddr sk, *sa = &sk; 12222514Sdarrenr struct strbuf cbuf, *cp = &cbuf, dbuf, *dp = &dbuf; 12322514Sdarrenr 12422514Sdarrenr /* 12522514Sdarrenr * For ethernet, need at least 802.3 header and IP header. 12622514Sdarrenr */ 12722514Sdarrenr if (len < (sizeof(sa->sa_data) + sizeof(struct ip))) 12822514Sdarrenr return -1; 12922514Sdarrenr /* 13022514Sdarrenr * to avoid any output processing for IP, say we're not. 13122514Sdarrenr */ 13222514Sdarrenr sa->sa_family = AF_UNSPEC; 13322514Sdarrenr bcopy(pkt, sa->sa_data, sizeof(sa->sa_data)); 13422514Sdarrenr pkt += sizeof(sa->sa_data); 13522514Sdarrenr len -= sizeof(sa->sa_data); 13622514Sdarrenr 13722514Sdarrenr /* 13822514Sdarrenr * construct NIT STREAMS messages, first control then data. 13922514Sdarrenr */ 14022514Sdarrenr cp->len = sizeof(*sa); 14122514Sdarrenr cp->maxlen = sizeof(*sa); 14222514Sdarrenr cp->buf = (char *)sa; 14322514Sdarrenr 14422514Sdarrenr dp->buf = pkt; 14522514Sdarrenr dp->len = len; 14622514Sdarrenr dp->maxlen = dp->len; 14722514Sdarrenr 14822514Sdarrenr if (putmsg(fd, cp, dp, 0) == -1) 14922514Sdarrenr { 15022514Sdarrenr perror("putmsg"); 15122514Sdarrenr return -1; 15222514Sdarrenr } 15322514Sdarrenr 15422514Sdarrenr if (ioctl(fd, I_FLUSH, FLUSHW) == -1) 15522514Sdarrenr { 15622514Sdarrenr perror("I_FLUSH"); 15722514Sdarrenr return -1; 15822514Sdarrenr } 15922514Sdarrenr return len; 16022514Sdarrenr} 161