pcap-snit.c revision 75107
117683Spst/* 217683Spst * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996 317683Spst * The Regents of the University of California. All rights reserved. 417683Spst * 517683Spst * Redistribution and use in source and binary forms, with or without 617683Spst * modification, are permitted provided that: (1) source code distributions 717683Spst * retain the above copyright notice and this paragraph in its entirety, (2) 817683Spst * distributions including binary code include the above copyright notice and 917683Spst * this paragraph in its entirety in the documentation or other materials 1017683Spst * provided with the distribution, and (3) all advertising materials mentioning 1117683Spst * features or use of this software display the following acknowledgement: 1217683Spst * ``This product includes software developed by the University of California, 1317683Spst * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 1417683Spst * the University nor the names of its contributors may be used to endorse 1517683Spst * or promote products derived from this software without specific prior 1617683Spst * written permission. 1717683Spst * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 1817683Spst * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 1917683Spst * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 2026175Sfenner * 2117683Spst * Modifications made to accommodate the new SunOS4.0 NIT facility by 2217683Spst * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989. 2317683Spst * This module now handles the STREAMS based NIT. 2417683Spst */ 2517683Spst 2626175Sfenner#ifndef lint 2726175Sfennerstatic const char rcsid[] = 2875107Sfenner "@(#) $Header: /tcpdump/master/libpcap/pcap-snit.c,v 1.54 2000/10/28 00:01:30 guy Exp $ (LBL)"; 2926175Sfenner#endif 3026175Sfenner 3175107Sfenner#ifdef HAVE_CONFIG_H 3275107Sfenner#include "config.h" 3375107Sfenner#endif 3475107Sfenner 3517683Spst#include <sys/types.h> 3617683Spst#include <sys/time.h> 3717683Spst#include <sys/timeb.h> 3817683Spst#include <sys/dir.h> 3917683Spst#include <sys/fcntlcom.h> 4017683Spst#include <sys/file.h> 4117683Spst#include <sys/ioctl.h> 4217683Spst#include <sys/socket.h> 4317683Spst#include <sys/stropts.h> 4417683Spst 4517683Spst#include <net/if.h> 4617683Spst#include <net/nit.h> 4717683Spst#include <net/nit_if.h> 4817683Spst#include <net/nit_pf.h> 4917683Spst#include <net/nit_buf.h> 5017683Spst 5117683Spst#include <netinet/in.h> 5217683Spst#include <netinet/in_systm.h> 5317683Spst#include <netinet/ip.h> 5417683Spst#include <netinet/if_ether.h> 5517683Spst#include <netinet/ip_var.h> 5617683Spst#include <netinet/udp.h> 5717683Spst#include <netinet/udp_var.h> 5817683Spst#include <netinet/tcp.h> 5917683Spst#include <netinet/tcpip.h> 6017683Spst 6117683Spst#include <ctype.h> 6217683Spst#include <errno.h> 6317683Spst#include <stdio.h> 6417683Spst#include <string.h> 6517683Spst#include <unistd.h> 6617683Spst 6717683Spst#include "pcap-int.h" 6817683Spst 6917683Spst#ifdef HAVE_OS_PROTO_H 7017683Spst#include "os-proto.h" 7117683Spst#endif 7217683Spst 7317683Spst/* 7417683Spst * The chunk size for NIT. This is the amount of buffering 7517683Spst * done for read calls. 7617683Spst */ 7717683Spst#define CHUNKSIZE (2*1024) 7817683Spst 7917683Spst/* 8017683Spst * The total buffer space used by NIT. 8117683Spst */ 8217683Spst#define BUFSPACE (4*CHUNKSIZE) 8317683Spst 8417683Spst/* Forwards */ 8517683Spststatic int nit_setflags(int, int, int, char *); 8617683Spst 8717683Spstint 8817683Spstpcap_stats(pcap_t *p, struct pcap_stat *ps) 8917683Spst{ 9017683Spst 9117683Spst *ps = p->md.stat; 9217683Spst return (0); 9317683Spst} 9417683Spst 9517683Spstint 9617683Spstpcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 9717683Spst{ 9817683Spst register int cc, n; 9917683Spst register struct bpf_insn *fcode = p->fcode.bf_insns; 10017683Spst register u_char *bp, *cp, *ep; 10117683Spst register struct nit_bufhdr *hdrp; 10217683Spst register struct nit_iftime *ntp; 10317683Spst register struct nit_iflen *nlp; 10417683Spst register struct nit_ifdrops *ndp; 10517683Spst register int caplen; 10617683Spst 10717683Spst cc = p->cc; 10817683Spst if (cc == 0) { 10917683Spst cc = read(p->fd, (char *)p->buffer, p->bufsize); 11017683Spst if (cc < 0) { 11117683Spst if (errno == EWOULDBLOCK) 11217683Spst return (0); 11375107Sfenner snprintf(p->errbuf, sizeof(p->errbuf), "pcap_read: %s", 11417683Spst pcap_strerror(errno)); 11517683Spst return (-1); 11617683Spst } 11717683Spst bp = p->buffer; 11817683Spst } else 11917683Spst bp = p->bp; 12017683Spst 12117683Spst /* 12217683Spst * loop through each snapshot in the chunk 12317683Spst */ 12417683Spst n = 0; 12517683Spst ep = bp + cc; 12617683Spst while (bp < ep) { 12717683Spst ++p->md.stat.ps_recv; 12817683Spst cp = bp; 12917683Spst 13017683Spst /* get past NIT buffer */ 13117683Spst hdrp = (struct nit_bufhdr *)cp; 13217683Spst cp += sizeof(*hdrp); 13317683Spst 13417683Spst /* get past NIT timer */ 13517683Spst ntp = (struct nit_iftime *)cp; 13617683Spst cp += sizeof(*ntp); 13717683Spst 13817683Spst ndp = (struct nit_ifdrops *)cp; 13917683Spst p->md.stat.ps_drop = ndp->nh_drops; 14017683Spst cp += sizeof *ndp; 14117683Spst 14217683Spst /* get past packet len */ 14317683Spst nlp = (struct nit_iflen *)cp; 14417683Spst cp += sizeof(*nlp); 14517683Spst 14617683Spst /* next snapshot */ 14717683Spst bp += hdrp->nhb_totlen; 14817683Spst 14917683Spst caplen = nlp->nh_pktlen; 15017683Spst if (caplen > p->snapshot) 15117683Spst caplen = p->snapshot; 15217683Spst 15317683Spst if (bpf_filter(fcode, cp, nlp->nh_pktlen, caplen)) { 15417683Spst struct pcap_pkthdr h; 15517683Spst h.ts = ntp->nh_timestamp; 15617683Spst h.len = nlp->nh_pktlen; 15717683Spst h.caplen = caplen; 15817683Spst (*callback)(user, &h, cp); 15917683Spst if (++n >= cnt && cnt >= 0) { 16017683Spst p->cc = ep - bp; 16117683Spst p->bp = bp; 16217683Spst return (n); 16317683Spst } 16417683Spst } 16517683Spst } 16617683Spst p->cc = 0; 16717683Spst return (n); 16817683Spst} 16917683Spst 17017683Spststatic int 17117683Spstnit_setflags(int fd, int promisc, int to_ms, char *ebuf) 17217683Spst{ 17317683Spst bpf_u_int32 flags; 17417683Spst struct strioctl si; 17517683Spst struct timeval timeout; 17617683Spst 17717683Spst si.ic_timout = INFTIM; 17817683Spst if (to_ms != 0) { 17917683Spst timeout.tv_sec = to_ms / 1000; 18017683Spst timeout.tv_usec = (to_ms * 1000) % 1000000; 18117683Spst si.ic_cmd = NIOCSTIME; 18217683Spst si.ic_len = sizeof(timeout); 18317683Spst si.ic_dp = (char *)&timeout; 18417683Spst if (ioctl(fd, I_STR, (char *)&si) < 0) { 18575107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSTIME: %s", 18675107Sfenner pcap_strerror(errno)); 18717683Spst return (-1); 18817683Spst } 18917683Spst } 19017683Spst flags = NI_TIMESTAMP | NI_LEN | NI_DROPS; 19117683Spst if (promisc) 19217683Spst flags |= NI_PROMISC; 19317683Spst si.ic_cmd = NIOCSFLAGS; 19417683Spst si.ic_len = sizeof(flags); 19517683Spst si.ic_dp = (char *)&flags; 19617683Spst if (ioctl(fd, I_STR, (char *)&si) < 0) { 19775107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSFLAGS: %s", 19875107Sfenner pcap_strerror(errno)); 19917683Spst return (-1); 20017683Spst } 20117683Spst return (0); 20217683Spst} 20317683Spst 20417683Spstpcap_t * 20517683Spstpcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf) 20617683Spst{ 20717683Spst struct strioctl si; /* struct for ioctl() */ 20817683Spst struct ifreq ifr; /* interface request struct */ 20917683Spst int chunksize = CHUNKSIZE; 21017683Spst int fd; 21117683Spst static char dev[] = "/dev/nit"; 21217683Spst register pcap_t *p; 21317683Spst 21417683Spst p = (pcap_t *)malloc(sizeof(*p)); 21517683Spst if (p == NULL) { 21675107Sfenner strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE); 21717683Spst return (NULL); 21817683Spst } 21917683Spst 22017683Spst if (snaplen < 96) 22117683Spst /* 22217683Spst * NIT requires a snapshot length of at least 96. 22317683Spst */ 22417683Spst snaplen = 96; 22517683Spst 22675107Sfenner memset(p, 0, sizeof(*p)); 22717683Spst p->fd = fd = open(dev, O_RDONLY); 22817683Spst if (fd < 0) { 22975107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s", dev, 23075107Sfenner pcap_strerror(errno)); 23117683Spst goto bad; 23217683Spst } 23317683Spst 23417683Spst /* arrange to get discrete messages from the STREAM and use NIT_BUF */ 23517683Spst if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) { 23675107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "I_SRDOPT: %s", 23775107Sfenner pcap_strerror(errno)); 23817683Spst goto bad; 23917683Spst } 24017683Spst if (ioctl(fd, I_PUSH, "nbuf") < 0) { 24175107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "push nbuf: %s", 24275107Sfenner pcap_strerror(errno)); 24317683Spst goto bad; 24417683Spst } 24517683Spst /* set the chunksize */ 24617683Spst si.ic_cmd = NIOCSCHUNK; 24717683Spst si.ic_timout = INFTIM; 24817683Spst si.ic_len = sizeof(chunksize); 24917683Spst si.ic_dp = (char *)&chunksize; 25017683Spst if (ioctl(fd, I_STR, (char *)&si) < 0) { 25175107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSCHUNK: %s", 25275107Sfenner pcap_strerror(errno)); 25317683Spst goto bad; 25417683Spst } 25517683Spst 25617683Spst /* request the interface */ 25717683Spst strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)); 25817683Spst ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = ' '; 25917683Spst si.ic_cmd = NIOCBIND; 26017683Spst si.ic_len = sizeof(ifr); 26117683Spst si.ic_dp = (char *)𝔦 26217683Spst if (ioctl(fd, I_STR, (char *)&si) < 0) { 26375107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCBIND: %s: %s", 26417683Spst ifr.ifr_name, pcap_strerror(errno)); 26517683Spst goto bad; 26617683Spst } 26717683Spst 26817683Spst /* set the snapshot length */ 26917683Spst si.ic_cmd = NIOCSSNAP; 27017683Spst si.ic_len = sizeof(snaplen); 27117683Spst si.ic_dp = (char *)&snaplen; 27217683Spst if (ioctl(fd, I_STR, (char *)&si) < 0) { 27375107Sfenner snprintf(ebuf, PCAP_ERRBUF_SIZE, "NIOCSSNAP: %s", 27475107Sfenner pcap_strerror(errno)); 27517683Spst goto bad; 27617683Spst } 27717683Spst p->snapshot = snaplen; 27817683Spst if (nit_setflags(p->fd, promisc, to_ms, ebuf) < 0) 27917683Spst goto bad; 28017683Spst 28117683Spst (void)ioctl(fd, I_FLUSH, (char *)FLUSHR); 28217683Spst /* 28317683Spst * NIT supports only ethernets. 28417683Spst */ 28517683Spst p->linktype = DLT_EN10MB; 28617683Spst 28717683Spst p->bufsize = BUFSPACE; 28817683Spst p->buffer = (u_char *)malloc(p->bufsize); 28917683Spst if (p->buffer == NULL) { 29075107Sfenner strlcpy(ebuf, pcap_strerror(errno), PCAP_ERRBUF_SIZE); 29117683Spst goto bad; 29217683Spst } 29317683Spst return (p); 29417683Spst bad: 29517683Spst if (fd >= 0) 29617683Spst close(fd); 29717683Spst free(p); 29817683Spst return (NULL); 29917683Spst} 30017683Spst 30117683Spstint 30217683Spstpcap_setfilter(pcap_t *p, struct bpf_program *fp) 30317683Spst{ 30417683Spst 30575107Sfenner if (install_bpf_program(p, fp) < 0) 30675107Sfenner return (-1); 30717683Spst return (0); 30817683Spst} 309