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sendpacket.c
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sendpacket.c
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/* $Id$ */
/*
* Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>
* Copyright (c) 2013-2022 Fred Klassen <tcpreplay at appneta dot com> - AppNeta
*
* The Tcpreplay Suite of tools is free software: you can redistribute it
* and/or modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or with the authors permission any later version.
*
* The Tcpreplay Suite is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.
*/
/* sendpacket.[ch] is my attempt to write a universal packet injection
* API for BPF, libpcap, libdnet, and Linux's PF_PACKET. I got sick
* and tired dealing with libnet bugs and its lack of active maintenance,
* but unfortunately, libpcap frame injection support is relatively new
* and not everyone uses Linux, so I decided to support all four as
* best as possible. If your platform/OS/hardware supports an additional
* injection method, then by all means add it here (and send me a patch).
*
* Anyways, long story short, for now the order of preference is:
* 1. TX_RING
* 2. PF_PACKET
* 3. BPF
* 4. libdnet
* 5. pcap_inject()
* 6. pcap_sendpacket()
*
* Right now, one big problem with the pcap_* methods is that libpcap
* doesn't provide a reliable method of getting the MAC address of
* an interface (required for tcpbridge).
* You can use PF_PACKET or BPF to get that, but if your system supports
* those, might as well inject directly without going through another
* level of indirection.
*
* Please note that some of this code was copied from Libnet 1.1.3
*/
#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/socket.h>
#include "config.h"
#include "defines.h"
#include "common.h"
#include "sendpacket.h"
#ifdef FORCE_INJECT_TX_RING
/* TX_RING uses PF_PACKET API so don't undef it here */
#undef HAVE_LIBDNET
#undef HAVE_PCAP_INJECT
#undef HAVE_PCAP_SENDPACKET
#undef HAVE_BPF
#endif
#ifdef FORCE_INJECT_PF_PACKET
#undef HAVE_TX_RING
#undef HAVE_LIBDNET
#undef HAVE_PCAP_INJECT
#undef HAVE_PCAP_SENDPACKET
#undef HAVE_BPF
#endif
#ifdef FORCE_INJECT_LIBDNET
#undef HAVE_TX_RING
#undef HAVE_PF_PACKET
#undef HAVE_PCAP_INJECT
#undef HAVE_PCAP_SENDPACKET
#undef HAVE_BPF
#endif
#ifdef FORCE_INJECT_BPF
#undef HAVE_TX_RING
#undef HAVE_LIBDNET
#undef HAVE_PCAP_INJECT
#undef HAVE_PCAP_SENDPACKET
#undef HAVE_PF_PACKET
#endif
#ifdef FORCE_INJECT_PCAP_INJECT
#undef HAVE_TX_RING
#undef HAVE_LIBDNET
#undef HAVE_PCAP_SENDPACKET
#undef HAVE_BPF
#undef HAVE_PF_PACKET
#endif
#ifdef FORCE_INJECT_PCAP_SENDPACKET
#undef HAVE_TX_RING
#undef HAVE_LIBDNET
#undef HAVE_PCAP_INJECT
#undef HAVE_BPF
#undef HAVE_PF_PACKET
#endif
#if (defined HAVE_WINPCAP && defined HAVE_PCAP_INJECT)
#undef HAVE_PCAP_INJECT /* configure returns true for some odd reason */
#endif
#if !defined HAVE_PCAP_INJECT && !defined HAVE_PCAP_SENDPACKET && !defined HAVE_LIBDNET && !defined HAVE_PF_PACKET && !defined HAVE_BPF && !defined TX_RING
#error You need pcap_inject() or pcap_sendpacket() from libpcap, libdnet, Linux's PF_PACKET/TX_RING or *BSD's BPF
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_NET_ROUTE_H
#include <net/route.h>
#endif
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_PF_PACKET
#undef INJECT_METHOD
/* give priority to TX_RING */
#ifndef HAVE_TX_RING
#define INJECT_METHOD "PF_PACKET send()"
#else
#define INJECT_METHOD "PF_PACKET / TX_RING"
#endif
#include <fcntl.h>
#include <sys/utsname.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>
#include <netpacket/packet.h>
#ifdef HAVE_TX_RING
#include "txring.h"
#endif
static sendpacket_t *sendpacket_open_pf(const char *, char *);
static struct tcpr_ether_addr *sendpacket_get_hwaddr_pf(sendpacket_t *);
static int get_iface_index(int fd, const char *device, char *);
#endif /* HAVE_PF_PACKET */
#ifdef HAVE_TUNTAP
#ifdef HAVE_LINUX
#include <net/if.h>
#include <linux/if_tun.h>
#elif defined(HAVE_FREEBSD)
#define TUNTAP_DEVICE_PREFIX "/dev/"
#endif
static sendpacket_t *sendpacket_open_tuntap(const char *, char *);
#endif
#if defined HAVE_BPF && ! defined INJECT_METHOD
#undef INJECT_METHOD
#define INJECT_METHOD "bpf send()"
#include <net/bpf.h>
#include <sys/sysctl.h>
#include <net/route.h>
#include <net/if.h>
#include <sys/uio.h>
#include <net/if_dl.h> // used for get_hwaddr_bpf()
static sendpacket_t *sendpacket_open_bpf(const char *, char *) _U_;
static struct tcpr_ether_addr *sendpacket_get_hwaddr_bpf(sendpacket_t *) _U_;
#endif /* HAVE_BPF */
#if defined HAVE_LIBDNET && ! defined INJECT_METHOD
#undef INJECT_METHOD
#define INJECT_METHOD "libdnet eth_send()"
/* need to undef these which are pulled in via defines.h, prior to importing dnet.h */
#undef icmp_id
#undef icmp_seq
#undef icmp_data
#undef icmp_mask
#ifdef HAVE_DNET_H
#include <dnet.h>
#endif
#ifdef HAVE_DUMBNET_H
#include <dumbnet.h>
#endif
static sendpacket_t *sendpacket_open_libdnet(const char *, char *) _U_;
static struct tcpr_ether_addr *sendpacket_get_hwaddr_libdnet(sendpacket_t *) _U_;
#endif /* HAVE_LIBDNET */
#if (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET) && !(defined HAVE_PF_PACKET || defined BPF || defined HAVE_LIBDNET)
static sendpacket_t *sendpacket_open_pcap(const char *, char *) _U_;
static struct tcpr_ether_addr *sendpacket_get_hwaddr_pcap(sendpacket_t *) _U_;
#endif /* HAVE_PCAP_INJECT || HAVE_PACKET_SENDPACKET */
#if defined HAVE_PCAP_INJECT && ! defined INJECT_METHOD
#undef INJECT_METHOD
#define INJECT_METHOD "pcap_inject()"
#elif defined HAVE_PCAP_SENDPACKET && ! defined INJECT_METHOD
#undef INJECT_METHOD
#define INJECT_METHOD "pcap_sendpacket()"
#endif
static void sendpacket_seterr(sendpacket_t *sp, const char *fmt, ...);
static sendpacket_t * sendpacket_open_khial(const char *, char *) _U_;
static struct tcpr_ether_addr * sendpacket_get_hwaddr_khial(sendpacket_t *) _U_;
/**
* returns number of bytes sent on success or -1 on error
* Note: it is theoretically possible to get a return code >0 and < len
* which for most people would be considered an error (the packet wasn't fully sent)
* so you may want to test for recode != len too.
*
* Most socket API's have two interesting errors: ENOBUFS & EAGAIN. ENOBUFS
* is usually due to the kernel buffers being full. EAGAIN happens when you
* try to send traffic faster then the PHY allows.
*/
int
sendpacket(sendpacket_t *sp, const u_char *data, size_t len, struct pcap_pkthdr *pkthdr)
{
int retcode = 0, val;
static u_char buffer[10000]; /* 10K bytes, enough for jumbo frames + pkthdr
* larger than page size so made static to
* prevent page misses on stack
*/
static const size_t buffer_payload_size = sizeof(buffer) + sizeof(struct pcap_pkthdr);
assert(sp);
assert(data);
if (len == 0)
return -1;
TRY_SEND_AGAIN:
sp->attempt ++;
switch (sp->handle_type) {
case SP_TYPE_KHIAL:
memcpy(buffer, pkthdr, sizeof(struct pcap_pkthdr));
memcpy(buffer + sizeof(struct pcap_pkthdr), data, min(len, buffer_payload_size));
/* tell the kernel module which direction the traffic is going */
if (sp->cache_dir == TCPR_DIR_C2S) { /* aka PRIMARY */
val = KHIAL_DIRECTION_RX;
if (ioctl(sp->handle.fd, KHIAL_SET_DIRECTION, (void *)&val) < 0) {
sendpacket_seterr(sp, "Error setting direction on %s: %s (%d)",
sp->device, strerror(errno), errno);
return -1;
}
} else if (sp->cache_dir == TCPR_DIR_S2C) {
val = KHIAL_DIRECTION_TX;
if (ioctl(sp->handle.fd, KHIAL_SET_DIRECTION, (void *)&val) < 0) {
sendpacket_seterr(sp, "Error setting direction on %s: %s (%d)",
sp->device, strerror(errno), errno);
return -1;
}
}
/* write the pkthdr + packet data all at once */
retcode = write(sp->handle.fd, (void *)buffer, sizeof(struct pcap_pkthdr) + len);
retcode -= sizeof(struct pcap_pkthdr); /* only record packet bytes we sent, not pcap data too */
if (retcode < 0 && !sp->abort) {
switch(errno) {
case EAGAIN:
sp->retry_eagain ++;
goto TRY_SEND_AGAIN;
break;
case ENOBUFS:
sp->retry_enobufs ++;
goto TRY_SEND_AGAIN;
break;
default:
sendpacket_seterr(sp, "Error with %s [" COUNTER_SPEC "]: %s (errno = %d)",
"khial", sp->sent + sp->failed + 1, strerror(errno), errno);
}
break;
}
break;
case SP_TYPE_TUNTAP:
retcode = write(sp->handle.fd, (void *)data, len);
break;
/* Linux PF_PACKET and TX_RING */
case SP_TYPE_PF_PACKET:
case SP_TYPE_TX_RING:
#if defined HAVE_PF_PACKET
#ifdef HAVE_TX_RING
retcode = (int)txring_put(sp->tx_ring, data, len);
#else
retcode = (int)send(sp->handle.fd, (void *)data, len, 0);
#endif
/* out of buffers, or hit max PHY speed, silently retry
* as long as we're not told to abort
*/
if (retcode < 0 && !sp->abort) {
switch (errno) {
case EAGAIN:
sp->retry_eagain ++;
goto TRY_SEND_AGAIN;
break;
case ENOBUFS:
sp->retry_enobufs ++;
goto TRY_SEND_AGAIN;
break;
default:
sendpacket_seterr(sp, "Error with %s [" COUNTER_SPEC "]: %s (errno = %d)",
INJECT_METHOD, sp->sent + sp->failed + 1, strerror(errno), errno);
}
}
#endif /* HAVE_PF_PACKET */
break;
/* BPF */
case SP_TYPE_BPF:
#if defined HAVE_BPF
retcode = write(sp->handle.fd, (void *)data, len);
/* out of buffers, or hit max PHY speed, silently retry */
if (retcode < 0 && !sp->abort) {
switch (errno) {
case EAGAIN:
sp->retry_eagain ++;
goto TRY_SEND_AGAIN;
break;
case ENOBUFS:
sp->retry_enobufs ++;
goto TRY_SEND_AGAIN;
break;
default:
sendpacket_seterr(sp, "Error with %s [" COUNTER_SPEC "]: %s (errno = %d)",
INJECT_METHOD, sp->sent + sp->failed + 1, strerror(errno), errno);
}
}
#endif
break;
/* Libdnet */
case SP_TYPE_LIBDNET:
#if defined HAVE_LIBDNET
retcode = eth_send(sp->handle.ldnet, (void*)data, (size_t)len);
/* out of buffers, or hit max PHY speed, silently retry */
if (retcode < 0 && !sp->abort) {
switch (errno) {
case EAGAIN:
sp->retry_eagain ++;
goto TRY_SEND_AGAIN;
break;
case ENOBUFS:
sp->retry_enobufs ++;
goto TRY_SEND_AGAIN;
break;
default:
sendpacket_seterr(sp, "Error with %s [" COUNTER_SPEC "]: %s (errno = %d)",
INJECT_METHOD, sp->sent + sp->failed + 1, strerror(errno), errno);
}
}
#endif
break;
case SP_TYPE_LIBPCAP:
#if (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET)
#if defined HAVE_PCAP_INJECT
/*
* pcap methods don't seem to support ENOBUFS, so we just straight fail
* is there a better way???
*/
retcode = pcap_inject(sp->handle.pcap, (void*)data, len);
#elif defined HAVE_PCAP_SENDPACKET
retcode = pcap_sendpacket(sp->handle.pcap, data, (int)len);
#endif
/* out of buffers, or hit max PHY speed, silently retry */
if (retcode < 0 && !sp->abort) {
switch (errno) {
case EAGAIN:
sp->retry_eagain ++;
goto TRY_SEND_AGAIN;
break;
case ENOBUFS:
sp->retry_enobufs ++;
goto TRY_SEND_AGAIN;
break;
default:
sendpacket_seterr(sp, "Error with %s [" COUNTER_SPEC "]: %s (errno = %d)",
INJECT_METHOD, sp->sent + sp->failed + 1, pcap_geterr(sp->handle.pcap), errno);
}
}
#if defined HAVE_PCAP_SENDPACKET
/*
* pcap_sendpacket returns 0 on success, not the packet length!
* hence, we have to fix retcode to be more standard on success
*/
if (retcode == 0)
retcode = len;
#endif /* HAVE_PCAP_SENDPACKET */
#endif /* HAVE_PCAP_INJECT || HAVE_PCAP_SENDPACKET */
break;
case SP_TYPE_NETMAP:
#ifdef HAVE_NETMAP
retcode = sendpacket_send_netmap(sp, data, len);
if (retcode == -1) {
sendpacket_seterr(sp, "interface hung!!");
} else if (retcode == -2) {
/* this indicates that a retry was requested - this is not a failure */
sp->retry_eagain ++;
retcode = 0;
#ifdef HAVE_SCHED_H
/* yield the CPU so other apps remain responsive */
sched_yield();
#endif
goto TRY_SEND_AGAIN;
}
#endif /* HAVE_NETMAP */
break;
default:
errx(-1, "Unsupported sp->handle_type = %d", sp->handle_type);
} /* end case */
if (retcode < 0) {
sp->failed ++;
} else if (sp->abort) {
sendpacket_seterr(sp, "User abort");
} else if (retcode != (int)len) {
sendpacket_seterr(sp, "Only able to write %d bytes out of %lu bytes total",
retcode, len);
sp->trunc_packets ++;
} else {
sp->bytes_sent += len;
sp->sent ++;
}
return retcode;
}
/**
* Open the given network device name and returns a sendpacket_t struct
* pass the error buffer (in case there's a problem) and the direction
* that this interface represents
*/
sendpacket_t *
sendpacket_open(const char *device, char *errbuf, tcpr_dir_t direction,
sendpacket_type_t sendpacket_type _U_, void *arg _U_)
{
#ifdef HAVE_TUNTAP
char sys_dev_dir[128];
bool device_exists;
#endif
sendpacket_t *sp;
struct stat sdata;
assert(device);
assert(errbuf);
errbuf[0] = '\0';
#ifdef HAVE_TUNTAP
snprintf(sys_dev_dir, sizeof(sys_dev_dir), "/sys/class/net/%s/", device);
device_exists = access(sys_dev_dir, R_OK) == 0;
#endif
/* khial is universal */
if (stat(device, &sdata) == 0) {
if (((sdata.st_mode & S_IFMT) == S_IFCHR)) {
sp = sendpacket_open_khial(device, errbuf);
} else {
switch (sdata.st_mode & S_IFMT) {
case S_IFBLK:
errx(-1, "\"%s\" is a block device and is not a valid Tcpreplay device",
device);
break;
case S_IFDIR:
errx(-1, "\"%s\" is a directory and is not a valid Tcpreplay device",
device);
break;
case S_IFIFO:
errx(-1, "\"%s\" is a FIFO and is not a valid Tcpreplay device",
device);
break;
case S_IFLNK:
errx(-1, "\"%s\" is a symbolic link and is not a valid Tcpreplay device",
device);
break;
case S_IFREG:
errx(-1, "\"%s\" is a file and is not a valid Tcpreplay device",
device);
break;
default:
errx(-1, "\"%s\" is not a valid Tcpreplay device",
device);
break;
}
}
#ifdef HAVE_TUNTAP
} else if (strncmp(device, "tap", 3) == 0 && !device_exists) {
sp = sendpacket_open_tuntap(device, errbuf);
#endif
} else {
#ifdef HAVE_NETMAP
if (sendpacket_type == SP_TYPE_NETMAP)
sp = (sendpacket_t*)sendpacket_open_netmap(device, errbuf, arg);
else
#endif
#if defined HAVE_PF_PACKET
sp = sendpacket_open_pf(device, errbuf);
#elif defined HAVE_BPF
sp = sendpacket_open_bpf(device, errbuf);
#elif defined HAVE_LIBDNET
sp = sendpacket_open_libdnet(device, errbuf);
#elif (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET)
sp = sendpacket_open_pcap(device, errbuf);
#else
#error "No defined packet injection method for sendpacket_open()"
#endif
}
if (sp) {
sp->open = 1;
sp->cache_dir = direction;
} else {
errx(-1, "failed to open device %s: %s", device, errbuf);
}
return sp;
}
/**
* Get packet stats for the given sendpacket_t
*/
size_t
sendpacket_getstat(sendpacket_t *sp, char *buf, size_t buf_size)
{
size_t offset;
assert(sp);
assert(buf);
memset(buf, 0, buf_size);
offset = snprintf(buf, buf_size, "Statistics for network device: %s\n"
"\tSuccessful packets: " COUNTER_SPEC "\n"
"\tFailed packets: " COUNTER_SPEC "\n"
"\tTruncated packets: " COUNTER_SPEC "\n"
"\tRetried packets (ENOBUFS): " COUNTER_SPEC "\n"
"\tRetried packets (EAGAIN): " COUNTER_SPEC "\n",
sp->device, sp->sent, sp->failed, sp->trunc_packets,
sp->retry_enobufs, sp->retry_eagain);
if (sp->flow_packets && offset > 0) {
offset += snprintf(&buf[offset], buf_size - offset,
"\tFlows total: " COUNTER_SPEC "\n"
"\tFlows unique: " COUNTER_SPEC "\n"
"\tFlows expired: " COUNTER_SPEC "\n"
"\tFlow packets: " COUNTER_SPEC "\n"
"\tNon-flow packets: " COUNTER_SPEC "\n"
"\tInvalid flow packets: " COUNTER_SPEC "\n",
sp->flows, sp->flows_expired, sp->flows_expired, sp->flow_packets,
sp->flow_non_flow_packets, sp->flows_invalid_packets);
}
return offset;
}
/**
* close the given sendpacket
*/
void
sendpacket_close(sendpacket_t *sp)
{
assert(sp);
switch(sp->handle_type) {
case SP_TYPE_KHIAL:
close(sp->handle.fd);
break;
case SP_TYPE_BPF:
#if (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET)
close(sp->handle.fd);
#endif
break;
case SP_TYPE_PF_PACKET:
case SP_TYPE_TX_RING:
#ifdef HAVE_PF_PACKET
close(sp->handle.fd);
#endif
break;
case SP_TYPE_LIBPCAP:
#ifdef HAVE_LIBPCAP
pcap_close(sp->handle.pcap);
#endif
break;
case SP_TYPE_LIBDNET:
#ifdef HAVE_LIBDNET
eth_close(sp->handle.ldnet);
#endif
break;
case SP_TYPE_LIBNET:
err(-1, "Libnet is no longer supported!");
break;
case SP_TYPE_NETMAP:
#ifdef HAVE_NETMAP
sendpacket_close_netmap(sp);
#endif /* HAVE_NETMAP */
break;
case SP_TYPE_TUNTAP:
#ifdef HAVE_TUNTAP
close(sp->handle.fd);
#endif
break;
case SP_TYPE_NONE:
err(-1, "no injector selected!");
break;
}
safe_free(sp);
}
/**
* returns the Layer 2 address of the interface current
* open. on error, return NULL
*/
struct tcpr_ether_addr *
sendpacket_get_hwaddr(sendpacket_t *sp)
{
struct tcpr_ether_addr *addr;
assert(sp);
/* if we already have our MAC address stored, just return it */
if (memcmp(&sp->ether, "\x00\x00\x00\x00\x00\x00", ETHER_ADDR_LEN) != 0)
return &sp->ether;
if (sp->handle_type == SP_TYPE_KHIAL) {
addr = sendpacket_get_hwaddr_khial(sp);
} else {
#if defined HAVE_PF_PACKET
addr = sendpacket_get_hwaddr_pf(sp);
#elif defined HAVE_BPF
addr = sendpacket_get_hwaddr_bpf(sp);
#elif defined HAVE_LIBDNET
addr = sendpacket_get_hwaddr_libdnet(sp);
#elif (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET)
addr = sendpacket_get_hwaddr_pcap(sp);
#endif
}
return addr;
}
/**
* returns the error string
*/
char *
sendpacket_geterr(sendpacket_t *sp)
{
assert(sp);
return sp->errbuf;
}
/**
* Set's the error string
*/
static void
sendpacket_seterr(sendpacket_t *sp, const char *fmt, ...)
{
va_list ap;
assert(sp);
va_start(ap, fmt);
if (fmt != NULL)
(void)vsnprintf(sp->errbuf, SENDPACKET_ERRBUF_SIZE, fmt, ap);
va_end(ap);
sp->errbuf[(SENDPACKET_ERRBUF_SIZE-1)] = '\0'; // be safe
}
#if (defined HAVE_PCAP_INJECT || defined HAVE_PCAP_SENDPACKET) && !(defined HAVE_PF_PACKET || defined BPF || defined HAVE_LIBDNET)
/**
* Inner sendpacket_open() method for using libpcap
*/
static sendpacket_t *
sendpacket_open_pcap(const char *device, char *errbuf)
{
pcap_t *pcap;
sendpacket_t *sp;
#ifdef BIOCSHDRCMPLT
u_int spoof_eth_src = 1;
int fd;
#endif
assert(device);
assert(errbuf);
dbg(1, "sendpacket: using Libpcap");
/* open_pcap_live automatically fills out our errbuf for us */
if ((pcap = pcap_open_live(device, 0, 0, 0, errbuf)) == NULL)
return NULL;
sp = (sendpacket_t *)safe_malloc(sizeof(sendpacket_t));
strlcpy(sp->device, device, sizeof(sp->device));
sp->handle.pcap = pcap;
#ifdef BIOCSHDRCMPLT
/*
* Only systems using BPF on the backend need this...
* other systems don't have ioctl and will get compile errors.
*/
fd = pcap_get_selectable_fd(pcap);
if (ioctl(fd, BIOCSHDRCMPLT, &spoof_eth_src) == -1)
errx(-1, "Unable to enable source MAC spoof support: %s", strerror(errno));
#endif
sp->handle_type = SP_TYPE_LIBPCAP;
return sp;
}
/**
* Get the hardware MAC address for the given interface using libpcap
*/
static struct tcpr_ether_addr *
sendpacket_get_hwaddr_pcap(sendpacket_t *sp)
{
assert(sp);
sendpacket_seterr(sp, "Error: sendpacket_get_hwaddr() not yet supported for pcap injection");
return NULL;
}
#endif /* HAVE_PCAP_INJECT || HAVE_PCAP_SENDPACKET */
#if defined HAVE_LIBDNET && !defined HAVE_PF_PACKET && !defined HAVE_BPF
/**
* Inner sendpacket_open() method for using libdnet
*/
static sendpacket_t *
sendpacket_open_libdnet(const char *device, char *errbuf)
{
eth_t *ldnet;
sendpacket_t *sp;
assert(device);
assert(errbuf);
dbg(1, "sendpacket: using Libdnet");
if ((ldnet = eth_open(device)) == NULL)
return NULL;
sp = (sendpacket_t *)safe_malloc(sizeof(sendpacket_t));
strlcpy(sp->device, device, sizeof(sp->device));
sp->handle.ldnet = ldnet;
sp->handle_type = SP_TYPE_LIBDNET;
return sp;
}
/**
* Get the hardware MAC address for the given interface using libdnet
*/
static struct tcpr_ether_addr *
sendpacket_get_hwaddr_libdnet(sendpacket_t *sp)
{
struct tcpr_ether_addr *addr = NULL;
int ret;
assert(sp);
ret = eth_get(sp->handle.ldnet, (eth_addr_t *)addr);
if (addr == NULL || ret < 0) {
sendpacket_seterr(sp, "Error getting hwaddr via libdnet: %s", strerror(errno));
return NULL;
}
memcpy(&sp->ether, addr, sizeof(struct tcpr_ether_addr));
return(&sp->ether);
}
#endif /* HAVE_LIBDNET */
#if defined HAVE_TUNTAP
/**
* Inner sendpacket_open() method for tuntap devices
*/
static sendpacket_t *
sendpacket_open_tuntap(const char *device, char *errbuf)
{
sendpacket_t *sp;
struct ifreq ifr;
int tapfd;
assert(device);
assert(errbuf);
#if defined HAVE_LINUX
if ((tapfd = open("/dev/net/tun", O_RDWR)) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Could not open /dev/net/tun control file: %s", strerror(errno));
return NULL;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = (IFF_TAP | IFF_NO_PI);
strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name)-1);
if (ioctl(tapfd, TUNSETIFF, (void *) &ifr) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Unable to create tuntap interface: %s", device);
close(tapfd);
return NULL;
}
#elif defined(HAVE_FREEBSD)
if (*device == '/') {
if ((tapfd = open(device, O_RDWR)) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Could not open device %s: %s", device, strerror(errno));
return NULL;
}
} else {
/* full path needed */
char *path;
int prefix_length = strlen(TUNTAP_DEVICE_PREFIX);
if ((path = malloc(strlen(device) + prefix_length + 1)) == NULL) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Malloc error: %s", strerror(errno));
return NULL;
}
snprintf(path, strlen(device) + prefix_length + 1, "%s%s", TUNTAP_DEVICE_PREFIX, device);
if ((tapfd = open(path, O_RDWR)) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Could not open device %s: %s", path, strerror(errno));
free(path);
return NULL;
}
free(path);
}
#endif
/* prep & return our sp handle */
sp = (sendpacket_t *)safe_malloc(sizeof(sendpacket_t));
strlcpy(sp->device, device, sizeof(sp->device));
sp->handle.fd = tapfd;
sp->handle_type = SP_TYPE_TUNTAP;
return sp;
}
#endif
#if defined HAVE_PF_PACKET
/**
* Inner sendpacket_open() method for using Linux's PF_PACKET or TX_RING
*/
static sendpacket_t *
sendpacket_open_pf(const char *device, char *errbuf)
{
int mysocket;
sendpacket_t *sp;
struct ifreq ifr;
struct sockaddr_ll sa;
int err;
socklen_t errlen = sizeof(err);
unsigned int UNUSED(mtu) = 1500;
#ifdef SO_BROADCAST
int n = 1;
#endif
assert(device);
assert(errbuf);
#if defined TX_RING
dbg(1, "sendpacket: using TX_RING");
#else
dbg(1, "sendpacket: using PF_PACKET");
#endif
memset(&sa, 0, sizeof(sa));
/* open our socket */
if ((mysocket = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "socket: %s", strerror(errno));
return NULL;
}
/* get the interface id for the device */
if ((sa.sll_ifindex = get_iface_index(mysocket, device, errbuf)) < 0) {
close(mysocket);
return NULL;
}
/* bind socket to our interface id */
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(ETH_P_ALL);
if (bind(mysocket, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "bind error: %s", strerror(errno));
close(mysocket);
return NULL;
}
/* check for errors, network down, etc... */
if (getsockopt(mysocket, SOL_SOCKET, SO_ERROR, &err, &errlen) < 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "error opening %s: %s", device,
strerror(errno));
close(mysocket);
return NULL;
}
if (err > 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "error opening %s: %s", device,
strerror(err));
close(mysocket);
return NULL;
}
/* get hardware type for our interface */
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(mysocket, SIOCGIFHWADDR, &ifr) < 0) {
close(mysocket);
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Error getting hardware type: %s",
strerror(errno));
return NULL;
}
/* make sure it's not loopback (PF_PACKET doesn't support it) */
if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER)
warnx("Unsupported physical layer type 0x%04x on %s. Maybe it works, maybe it won't."
" See tickets #123/318", ifr.ifr_hwaddr.sa_family, device);
#ifdef SO_BROADCAST
/*
* man 7 socket
*
* Set or get the broadcast flag. When enabled, datagram sockets
* receive packets sent to a broadcast address and they are allowed
* to send packets to a broadcast address. This option has no
* effect on stream-oriented sockets.
*/
if (setsockopt(mysocket, SOL_SOCKET, SO_BROADCAST, &n, sizeof(n)) == -1) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE,
"SO_BROADCAST: %s", strerror(errno));
close(mysocket);
return NULL;
}
#endif /* SO_BROADCAST */
/* prep & return our sp handle */
sp = (sendpacket_t *)safe_malloc(sizeof(sendpacket_t));
strlcpy(sp->device, device, sizeof(sp->device));
sp->handle.fd = mysocket;
#ifdef HAVE_TX_RING
/* Look up for MTU */
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, sp->device, sizeof(ifr.ifr_name));
if (ioctl(mysocket, SIOCGIFMTU, &ifr) < 0) {
close(mysocket);
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "Error getting MTU: %s", strerror(errno));
return NULL;
}
mtu = ifr.ifr_ifru.ifru_mtu;
/* Init TX ring for sp->handle.fd socket */
if ((sp->tx_ring = txring_init(sp->handle.fd, mtu)) == 0) {
snprintf(errbuf, SENDPACKET_ERRBUF_SIZE, "txring_init: %s", strerror(errno));
close(mysocket);
return NULL;
}
sp->handle_type = SP_TYPE_TX_RING;
#else
sp->handle_type = SP_TYPE_PF_PACKET;
#endif
return sp;
}