diff options
Diffstat (limited to 'lib/libpcap/libpcap/pcap-snit.c')
| -rw-r--r-- | lib/libpcap/libpcap/pcap-snit.c | 506 |
1 files changed, 506 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/pcap-snit.c b/lib/libpcap/libpcap/pcap-snit.c new file mode 100644 index 0000000..9c6fbd4 --- /dev/null +++ b/lib/libpcap/libpcap/pcap-snit.c @@ -0,0 +1,506 @@ +/* + * 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. + * + * Modifications made to accommodate the new SunOS4.0 NIT facility by + * Micky Liu, micky@cunixc.cc.columbia.edu, Columbia University in May, 1989. + * This module now handles the STREAMS based NIT. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/timeb.h> +#include <sys/dir.h> +#include <sys/fcntlcom.h> +#include <sys/file.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <sys/stropts.h> + +#include <net/if.h> +#include <net/nit.h> +#include <net/nit_if.h> +#include <net/nit_pf.h> +#include <net/nit_buf.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#include <netinet/if_ether.h> +#include <netinet/ip_var.h> +#include <netinet/udp.h> +#include <netinet/udp_var.h> +#include <netinet/tcp.h> +#include <netinet/tcpip.h> + +#include <ctype.h> +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include "pcap-int.h" + +#ifdef HAVE_OS_PROTO_H +#include "os-proto.h" +#endif + +/* + * The chunk size for NIT. This is the amount of buffering + * done for read calls. + */ +#define CHUNKSIZE (2*1024) + +/* + * The total buffer space used by NIT. + */ +#define BUFSPACE (4*CHUNKSIZE) + +/* Forwards */ +static int nit_setflags(int, int, int, char *); + +/* + * Private data for capturing on STREAMS NIT devices. + */ +struct pcap_snit { + struct pcap_stat stat; +}; + +static int +pcap_stats_snit(pcap_t *p, struct pcap_stat *ps) +{ + struct pcap_snit *psn = p->priv; + + /* + * "ps_recv" counts packets handed to the filter, not packets + * that passed the filter. As filtering is done in userland, + * this does not include packets dropped because we ran out + * of buffer space. + * + * "ps_drop" counts packets dropped inside the "/dev/nit" + * device because of flow control requirements or resource + * exhaustion; it doesn't count packets dropped by the + * interface driver, or packets dropped upstream. As filtering + * is done in userland, it counts packets regardless of whether + * they would've passed the filter. + * + * These statistics don't include packets not yet read from the + * kernel by libpcap or packets not yet read from libpcap by the + * application. + */ + *ps = psn->stat; + return (0); +} + +static int +pcap_read_snit(pcap_t *p, int cnt, pcap_handler callback, u_char *user) +{ + struct pcap_snit *psn = p->priv; + register int cc, n; + register u_char *bp, *cp, *ep; + register struct nit_bufhdr *hdrp; + register struct nit_iftime *ntp; + register struct nit_iflen *nlp; + register struct nit_ifdrops *ndp; + register int caplen; + + cc = p->cc; + if (cc == 0) { + cc = read(p->fd, (char *)p->buffer, p->bufsize); + if (cc < 0) { + if (errno == EWOULDBLOCK) + return (0); + pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), + errno, "pcap_read"); + return (-1); + } + bp = (u_char *)p->buffer; + } else + bp = p->bp; + + /* + * loop through each snapshot in the chunk + */ + n = 0; + ep = bp + cc; + while (bp < ep) { + /* + * Has "pcap_breakloop()" been called? + * If so, return immediately - if we haven't read any + * packets, clear the flag and return -2 to indicate + * that we were told to break out of the loop, otherwise + * leave the flag set, so that the *next* call will break + * out of the loop without having read any packets, and + * return the number of packets we've processed so far. + */ + if (p->break_loop) { + if (n == 0) { + p->break_loop = 0; + return (-2); + } else { + p->bp = bp; + p->cc = ep - bp; + return (n); + } + } + + ++psn->stat.ps_recv; + cp = bp; + + /* get past NIT buffer */ + hdrp = (struct nit_bufhdr *)cp; + cp += sizeof(*hdrp); + + /* get past NIT timer */ + ntp = (struct nit_iftime *)cp; + cp += sizeof(*ntp); + + ndp = (struct nit_ifdrops *)cp; + psn->stat.ps_drop = ndp->nh_drops; + cp += sizeof *ndp; + + /* get past packet len */ + nlp = (struct nit_iflen *)cp; + cp += sizeof(*nlp); + + /* next snapshot */ + bp += hdrp->nhb_totlen; + + caplen = nlp->nh_pktlen; + if (caplen > p->snapshot) + caplen = p->snapshot; + + if (bpf_filter(p->fcode.bf_insns, cp, nlp->nh_pktlen, caplen)) { + struct pcap_pkthdr h; + h.ts = ntp->nh_timestamp; + h.len = nlp->nh_pktlen; + h.caplen = caplen; + (*callback)(user, &h, cp); + if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) { + p->cc = ep - bp; + p->bp = bp; + return (n); + } + } + } + p->cc = 0; + return (n); +} + +static int +pcap_inject_snit(pcap_t *p, const void *buf, size_t size) +{ + struct strbuf ctl, data; + + /* + * XXX - can we just do + * + ret = write(pd->f, buf, size); + */ + ctl.len = sizeof(*sa); /* XXX - what was this? */ + ctl.buf = (char *)sa; + data.buf = buf; + data.len = size; + ret = putmsg(p->fd, &ctl, &data); + if (ret == -1) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "send"); + return (-1); + } + return (ret); +} + +static int +nit_setflags(pcap_t *p) +{ + bpf_u_int32 flags; + struct strioctl si; + u_int zero = 0; + struct timeval timeout; + + if (p->opt.immediate) { + /* + * Set the chunk size to zero, so that chunks get sent + * up immediately. + */ + si.ic_cmd = NIOCSCHUNK; + si.ic_len = sizeof(zero); + si.ic_dp = (char *)&zero; + if (ioctl(p->fd, I_STR, (char *)&si) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCSCHUNK"); + return (-1); + } + } + si.ic_timout = INFTIM; + if (p->opt.timeout != 0) { + timeout.tv_sec = p->opt.timeout / 1000; + timeout.tv_usec = (p->opt.timeout * 1000) % 1000000; + si.ic_cmd = NIOCSTIME; + si.ic_len = sizeof(timeout); + si.ic_dp = (char *)&timeout; + if (ioctl(p->fd, I_STR, (char *)&si) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCSTIME"); + return (-1); + } + } + flags = NI_TIMESTAMP | NI_LEN | NI_DROPS; + if (p->opt.promisc) + flags |= NI_PROMISC; + si.ic_cmd = NIOCSFLAGS; + si.ic_len = sizeof(flags); + si.ic_dp = (char *)&flags; + if (ioctl(p->fd, I_STR, (char *)&si) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCSFLAGS"); + return (-1); + } + return (0); +} + +static int +pcap_activate_snit(pcap_t *p) +{ + struct strioctl si; /* struct for ioctl() */ + struct ifreq ifr; /* interface request struct */ + int chunksize = CHUNKSIZE; + int fd; + static const char dev[] = "/dev/nit"; + int err; + + if (p->opt.rfmon) { + /* + * No monitor mode on SunOS 4.x (no Wi-Fi devices on + * hardware supported by SunOS 4.x). + */ + return (PCAP_ERROR_RFMON_NOTSUP); + } + + /* + * Turn a negative snapshot value (invalid), a snapshot value of + * 0 (unspecified), or a value bigger than the normal maximum + * value, into the maximum allowed value. + * + * If some application really *needs* a bigger snapshot + * length, we should just increase MAXIMUM_SNAPLEN. + */ + if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN) + p->snapshot = MAXIMUM_SNAPLEN; + + if (p->snapshot < 96) + /* + * NIT requires a snapshot length of at least 96. + */ + p->snapshot = 96; + + /* + * Initially try a read/write open (to allow the inject + * method to work). If that fails due to permission + * issues, fall back to read-only. This allows a + * non-root user to be granted specific access to pcap + * capabilities via file permissions. + * + * XXX - we should have an API that has a flag that + * controls whether to open read-only or read-write, + * so that denial of permission to send (or inability + * to send, if sending packets isn't supported on + * the device in question) can be indicated at open + * time. + */ + p->fd = fd = open(dev, O_RDWR); + if (fd < 0 && errno == EACCES) + p->fd = fd = open(dev, O_RDONLY); + if (fd < 0) { + if (errno == EACCES) + err = PCAP_ERROR_PERM_DENIED; + else + err = PCAP_ERROR; + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "%s", dev); + goto bad; + } + + /* arrange to get discrete messages from the STREAM and use NIT_BUF */ + if (ioctl(fd, I_SRDOPT, (char *)RMSGD) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "I_SRDOPT"); + err = PCAP_ERROR; + goto bad; + } + if (ioctl(fd, I_PUSH, "nbuf") < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "push nbuf"); + err = PCAP_ERROR; + goto bad; + } + /* set the chunksize */ + si.ic_cmd = NIOCSCHUNK; + si.ic_timout = INFTIM; + si.ic_len = sizeof(chunksize); + si.ic_dp = (char *)&chunksize; + if (ioctl(fd, I_STR, (char *)&si) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCSCHUNK"); + err = PCAP_ERROR; + goto bad; + } + + /* request the interface */ + strncpy(ifr.ifr_name, p->opt.device, sizeof(ifr.ifr_name)); + ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0'; + si.ic_cmd = NIOCBIND; + si.ic_len = sizeof(ifr); + si.ic_dp = (char *)𝔦 + if (ioctl(fd, I_STR, (char *)&si) < 0) { + /* + * XXX - is there an error that means "no such device"? + * Is there one that means "that device doesn't support + * STREAMS NIT"? + */ + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCBIND: %s", ifr.ifr_name); + err = PCAP_ERROR; + goto bad; + } + + /* set the snapshot length */ + si.ic_cmd = NIOCSSNAP; + si.ic_len = sizeof(p->snapshot); + si.ic_dp = (char *)&p->snapshot; + if (ioctl(fd, I_STR, (char *)&si) < 0) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "NIOCSSNAP"); + err = PCAP_ERROR; + goto bad; + } + if (nit_setflags(p) < 0) { + err = PCAP_ERROR; + goto bad; + } + + (void)ioctl(fd, I_FLUSH, (char *)FLUSHR); + /* + * NIT supports only ethernets. + */ + p->linktype = DLT_EN10MB; + + p->bufsize = BUFSPACE; + p->buffer = malloc(p->bufsize); + if (p->buffer == NULL) { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "malloc"); + err = PCAP_ERROR; + goto bad; + } + + /* + * "p->fd" is an FD for a STREAMS device, so "select()" and + * "poll()" should work on it. + */ + p->selectable_fd = p->fd; + + /* + * This is (presumably) a real Ethernet capture; give it a + * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so + * that an application can let you choose it, in case you're + * capturing DOCSIS traffic that a Cisco Cable Modem + * Termination System is putting out onto an Ethernet (it + * doesn't put an Ethernet header onto the wire, it puts raw + * DOCSIS frames out on the wire inside the low-level + * Ethernet framing). + */ + p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2); + /* + * If that fails, just leave the list empty. + */ + if (p->dlt_list != NULL) { + p->dlt_list[0] = DLT_EN10MB; + p->dlt_list[1] = DLT_DOCSIS; + p->dlt_count = 2; + } + + p->read_op = pcap_read_snit; + p->inject_op = pcap_inject_snit; + p->setfilter_op = install_bpf_program; /* no kernel filtering */ + p->setdirection_op = NULL; /* Not implemented. */ + p->set_datalink_op = NULL; /* can't change data link type */ + p->getnonblock_op = pcap_getnonblock_fd; + p->setnonblock_op = pcap_setnonblock_fd; + p->stats_op = pcap_stats_snit; + + return (0); + bad: + pcap_cleanup_live_common(p); + return (err); +} + +pcap_t * +pcap_create_interface(const char *device _U_, char *ebuf) +{ + pcap_t *p; + + p = pcap_create_common(ebuf, sizeof (struct pcap_snit)); + if (p == NULL) + return (NULL); + + p->activate_op = pcap_activate_snit; + return (p); +} + +/* + * XXX - there's probably a NIOCBIND error that means "that device + * doesn't support NIT"; if so, we should try an NIOCBIND and use that. + */ +static int +can_be_bound(const char *name _U_) +{ + return (1); +} + +static int +get_if_flags(const char *name _U_, bpf_u_int32 *flags _U_, char *errbuf _U_) +{ + /* + * Nothing we can do. + * XXX - is there a way to find out whether an adapter has + * something plugged into it? + */ + return (0); +} + +int +pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) +{ + return (pcap_findalldevs_interfaces(devlistp, errbuf, can_be_bound, + get_if_flags)); +} + +/* + * Libpcap version string. + */ +const char * +pcap_lib_version(void) +{ + return (PCAP_VERSION_STRING); +} |