#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /cvs/root/libpcap/libpcap/pcap-bpf.c,v 1.1.1.3 2004/02/05 19:22:28 rbraun Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/timeb.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/utsname.h>
#include <net/if.h>
#ifdef _AIX
#define PCAP_DONT_INCLUDE_PCAP_BPF_H
#include <sys/types.h>
#undef _AIX
#include <net/bpf.h>
#define _AIX
#include <net/if_types.h>
#include <sys/sysconfig.h>
#include <sys/device.h>
#include <odmi.h>
#include <cf.h>
#ifdef __64BIT__
#define domakedev makedev64
#define getmajor major64
#define bpf_hdr bpf_hdr32
#else
#define domakedev makedev
#define getmajor major
#endif
#define BPF_NAME "bpf"
#define BPF_MINORS 4
#define DRIVER_PATH "/usr/lib/drivers"
#define BPF_NODE "/dev/bpf"
static int bpfloadedflag = 0;
static int odmlockid = 0;
#else
#include <net/bpf.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pcap-int.h"
#ifdef HAVE_DAG_API
#include "pcap-dag.h"
#endif
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#include "gencode.h"
static int pcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp);
static int pcap_set_datalink_bpf(pcap_t *p, int dlt);
static int
pcap_stats_bpf(pcap_t *p, struct pcap_stat *ps)
{
struct bpf_stat s;
if (ioctl(p->fd, BIOCGSTATS, (caddr_t)&s) < 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCGSTATS: %s",
pcap_strerror(errno));
return (-1);
}
ps->ps_recv = s.bs_recv;
ps->ps_drop = s.bs_drop;
return (0);
}
static int
pcap_read_bpf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
int cc;
int n = 0;
register u_char *bp, *ep;
struct bpf_insn *fcode;
fcode = p->md.use_bpf ? NULL : p->fcode.bf_insns;
again:
if (p->break_loop) {
p->break_loop = 0;
return (-2);
}
cc = p->cc;
if (p->cc == 0) {
cc = read(p->fd, (char *)p->buffer, p->bufsize);
if (cc < 0) {
switch (errno) {
case EINTR:
goto again;
#ifdef _AIX
case EFAULT:
goto again;
#endif
case EWOULDBLOCK:
return (0);
#if defined(sun) && !defined(BSD)
case EINVAL:
if (lseek(p->fd, 0L, SEEK_CUR) +
p->bufsize < 0) {
(void)lseek(p->fd, 0L, SEEK_SET);
goto again;
}
#endif
}
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read: %s",
pcap_strerror(errno));
return (-1);
}
bp = p->buffer;
} else
bp = p->bp;
#define bhp ((struct bpf_hdr *)bp)
ep = bp + cc;
while (bp < ep) {
register int caplen, hdrlen;
if (p->break_loop) {
if (n == 0) {
p->break_loop = 0;
return (-2);
} else {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
}
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
if (fcode == NULL ||
bpf_filter(fcode, bp + hdrlen, bhp->bh_datalen, caplen)) {
#ifdef _AIX
bhp->bh_tstamp.tv_usec = bhp->bh_tstamp.tv_usec/1000;
#endif
(*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
bp += BPF_WORDALIGN(caplen + hdrlen);
if (++n >= cnt && cnt > 0) {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
} else {
bp += BPF_WORDALIGN(caplen + hdrlen);
}
}
#undef bhp
p->cc = 0;
return (n);
}
#ifdef _AIX
static int
bpf_odminit(char *errbuf)
{
char *errstr;
if (odm_initialize() == -1) {
if (odm_err_msg(odmerrno, &errstr) == -1)
errstr = "Unknown error";
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_initialize failed: %s",
errstr);
return (-1);
}
if ((odmlockid = odm_lock("/etc/objrepos/config_lock", ODM_WAIT)) == -1) {
if (odm_err_msg(odmerrno, &errstr) == -1)
errstr = "Unknown error";
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_lock of /etc/objrepos/config_lock failed: %s",
errstr);
return (-1);
}
return (0);
}
static int
bpf_odmcleanup(char *errbuf)
{
char *errstr;
if (odm_unlock(odmlockid) == -1) {
if (odm_err_msg(odmerrno, &errstr) == -1)
errstr = "Unknown error";
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_unlock failed: %s",
errstr);
return (-1);
}
if (odm_terminate() == -1) {
if (odm_err_msg(odmerrno, &errstr) == -1)
errstr = "Unknown error";
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: odm_terminate failed: %s",
errstr);
return (-1);
}
return (0);
}
static int
bpf_load(char *errbuf)
{
long major;
int *minors;
int numminors, i, rc;
char buf[1024];
struct stat sbuf;
struct bpf_config cfg_bpf;
struct cfg_load cfg_ld;
struct cfg_kmod cfg_km;
if (bpfloadedflag)
return (0);
if (bpf_odminit(errbuf) != 0)
return (-1);
major = genmajor(BPF_NAME);
if (major == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: genmajor failed: %s", pcap_strerror(errno));
return (-1);
}
minors = getminor(major, &numminors, BPF_NAME);
if (!minors) {
minors = genminor("bpf", major, 0, BPF_MINORS, 1, 1);
if (!minors) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: genminor failed: %s",
pcap_strerror(errno));
return (-1);
}
}
if (bpf_odmcleanup(errbuf))
return (-1);
rc = stat(BPF_NODE "0", &sbuf);
if (rc == -1 && errno != ENOENT) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: can't stat %s: %s",
BPF_NODE "0", pcap_strerror(errno));
return (-1);
}
if (rc == -1 || getmajor(sbuf.st_rdev) != major) {
for (i = 0; i < BPF_MINORS; i++) {
sprintf(buf, "%s%d", BPF_NODE, i);
unlink(buf);
if (mknod(buf, S_IRUSR | S_IFCHR, domakedev(major, i)) == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: can't mknod %s: %s",
buf, pcap_strerror(errno));
return (-1);
}
}
}
memset(&cfg_ld, 0x0, sizeof(cfg_ld));
cfg_ld.path = buf;
sprintf(cfg_ld.path, "%s/%s", DRIVER_PATH, BPF_NAME);
if ((sysconfig(SYS_QUERYLOAD, (void *)&cfg_ld, sizeof(cfg_ld)) == -1) ||
(cfg_ld.kmid == 0)) {
if (sysconfig(SYS_SINGLELOAD, (void *)&cfg_ld, sizeof(cfg_ld)) == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: could not load driver: %s",
strerror(errno));
return (-1);
}
}
cfg_km.cmd = CFG_INIT;
cfg_km.kmid = cfg_ld.kmid;
cfg_km.mdilen = sizeof(cfg_bpf);
cfg_km.mdiptr = (void *)&cfg_bpf;
for (i = 0; i < BPF_MINORS; i++) {
cfg_bpf.devno = domakedev(major, i);
if (sysconfig(SYS_CFGKMOD, (void *)&cfg_km, sizeof(cfg_km)) == -1) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"bpf_load: could not configure driver: %s",
strerror(errno));
return (-1);
}
}
bpfloadedflag = 1;
return (0);
}
#endif
static inline int
bpf_open(pcap_t *p, char *errbuf)
{
int fd;
int n = 0;
char device[sizeof "/dev/bpf0000000000"];
#ifdef _AIX
if (bpf_load(errbuf) == -1)
return (-1);
#endif
do {
(void)snprintf(device, sizeof(device), "/dev/bpf%d", n++);
fd = open(device, O_RDONLY);
} while (fd < 0 && errno == EBUSY);
if (fd < 0)
snprintf(errbuf, PCAP_ERRBUF_SIZE, "(no devices found) %s: %s",
device, pcap_strerror(errno));
return (fd);
}
static void
pcap_close_bpf(pcap_t *p)
{
if (p->buffer != NULL)
free(p->buffer);
if (p->fd >= 0)
close(p->fd);
}
pcap_t *
pcap_open_live(const char *device, int snaplen, int promisc, int to_ms,
char *ebuf)
{
int fd;
struct ifreq ifr;
struct bpf_version bv;
#ifdef BIOCGDLTLIST
struct bpf_dltlist bdl;
#endif
u_int v;
pcap_t *p;
struct utsname osinfo;
#ifdef HAVE_DAG_API
if (strstr(device, "dag")) {
return dag_open_live(device, snaplen, promisc, to_ms, ebuf);
}
#endif
#ifdef BIOCGDLTLIST
memset(&bdl, 0, sizeof(bdl));
#endif
p = (pcap_t *)malloc(sizeof(*p));
if (p == NULL) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
pcap_strerror(errno));
return (NULL);
}
memset(p, 0, sizeof(*p));
fd = bpf_open(p, ebuf);
if (fd < 0)
goto bad;
p->fd = fd;
p->snapshot = snaplen;
if (ioctl(fd, BIOCVERSION, (caddr_t)&bv) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCVERSION: %s",
pcap_strerror(errno));
goto bad;
}
if (bv.bv_major != BPF_MAJOR_VERSION ||
bv.bv_minor < BPF_MINOR_VERSION) {
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"kernel bpf filter out of date");
goto bad;
}
if ((ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) || v < 32768)
v = 32768;
for ( ; v != 0; v >>= 1) {
(void) ioctl(fd, BIOCSBLEN, (caddr_t)&v);
(void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, BIOCSETIF, (caddr_t)&ifr) >= 0)
break;
if (errno != ENOBUFS) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCSETIF: %s: %s",
device, pcap_strerror(errno));
goto bad;
}
}
if (v == 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"BIOCSBLEN: %s: No buffer size worked", device);
goto bad;
}
if (ioctl(fd, BIOCGDLT, (caddr_t)&v) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCGDLT: %s",
pcap_strerror(errno));
goto bad;
}
#ifdef _AIX
switch (v) {
case IFT_ETHER:
case IFT_ISO88023:
v = DLT_EN10MB;
break;
case IFT_FDDI:
v = DLT_FDDI;
break;
case IFT_ISO88025:
v = DLT_IEEE802;
break;
case IFT_LOOP:
v = DLT_NULL;
break;
default:
snprintf(ebuf, PCAP_ERRBUF_SIZE, "unknown interface type %u",
v);
goto bad;
}
#endif
#if _BSDI_VERSION - 0 >= 199510
switch (v) {
case DLT_SLIP:
v = DLT_SLIP_BSDOS;
break;
case DLT_PPP:
v = DLT_PPP_BSDOS;
break;
case 11:
v = DLT_FRELAY;
break;
case 12:
v = DLT_CHDLC;
break;
}
#endif
p->linktype = v;
#ifdef BIOCGDLTLIST
if (ioctl(fd, BIOCGDLTLIST, (caddr_t)&bdl) == 0) {
bdl.bfl_list = (u_int *) malloc(sizeof(u_int) * bdl.bfl_len);
if (bdl.bfl_list == NULL) {
(void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
pcap_strerror(errno));
goto bad;
}
if (ioctl(fd, BIOCGDLTLIST, (caddr_t)&bdl) < 0) {
(void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
"BIOCGDLTLIST: %s", pcap_strerror(errno));
goto bad;
}
p->dlt_count = bdl.bfl_len;
p->dlt_list = bdl.bfl_list;
} else {
if (errno != EINVAL) {
(void)snprintf(ebuf, PCAP_ERRBUF_SIZE,
"BIOCGDLTLIST: %s", pcap_strerror(errno));
goto bad;
}
}
#endif
if (to_ms != 0) {
struct timeval to;
to.tv_sec = to_ms / 1000;
to.tv_usec = (to_ms * 1000) % 1000000;
if (ioctl(p->fd, BIOCSRTIMEOUT, (caddr_t)&to) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCSRTIMEOUT: %s",
pcap_strerror(errno));
goto bad;
}
}
#ifdef _AIX
#ifdef BIOCIMMEDIATE
v = 1;
if (ioctl(p->fd, BIOCIMMEDIATE, &v) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCIMMEDIATE: %s",
pcap_strerror(errno));
goto bad;
}
#endif
#endif
if (promisc) {
if (ioctl(p->fd, BIOCPROMISC, NULL) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCPROMISC: %s",
pcap_strerror(errno));
}
}
if (ioctl(fd, BIOCGBLEN, (caddr_t)&v) < 0) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "BIOCGBLEN: %s",
pcap_strerror(errno));
goto bad;
}
p->bufsize = v;
p->buffer = (u_char *)malloc(p->bufsize);
if (p->buffer == NULL) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
pcap_strerror(errno));
goto bad;
}
#ifdef _AIX
memset(p->buffer, 0x0, p->bufsize);
#endif
if (uname(&osinfo) == 0) {
if (strcmp(osinfo.sysname, "FreeBSD") == 0 &&
(strcmp(osinfo.release, "4.3") == 0 ||
strcmp(osinfo.release, "4.4") == 0))
p->selectable_fd = -1;
else
p->selectable_fd = p->fd;
} else {
p->selectable_fd = p->fd;
}
p->read_op = pcap_read_bpf;
p->setfilter_op = pcap_setfilter_bpf;
p->set_datalink_op = pcap_set_datalink_bpf;
p->getnonblock_op = pcap_getnonblock_fd;
p->setnonblock_op = pcap_setnonblock_fd;
p->stats_op = pcap_stats_bpf;
p->close_op = pcap_close_bpf;
return (p);
bad:
(void)close(fd);
#ifdef BIOCGDLTLIST
if (bdl.bfl_list != NULL)
free(bdl.bfl_list);
#endif
free(p);
return (NULL);
}
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
#ifdef HAVE_DAG_API
if (dag_platform_finddevs(alldevsp, errbuf) < 0)
return (-1);
#endif
return (0);
}
static int
pcap_setfilter_bpf(pcap_t *p, struct bpf_program *fp)
{
if (no_optimize) {
if (install_bpf_program(p, fp) < 0)
return (-1);
p->md.use_bpf = 0;
return (0);
}
pcap_freecode(&p->fcode);
if (ioctl(p->fd, BIOCSETF, (caddr_t)fp) < 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "BIOCSETF: %s",
pcap_strerror(errno));
return (-1);
}
p->md.use_bpf = 1;
return (0);
}
static int
pcap_set_datalink_bpf(pcap_t *p, int dlt)
{
#ifdef BIOCSDLT
if (ioctl(p->fd, BIOCSDLT, &dlt) == -1) {
(void) snprintf(p->errbuf, sizeof(p->errbuf),
"Cannot set DLT %d: %s", dlt, strerror(errno));
return (-1);
}
#endif
return (0);
}