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main.c
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main.c
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2019-2020 Microsoft Corporation
*
* DPDK application to dump network traffic
* This is designed to look and act like the Wireshark
* dumpcap program.
*/
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <inttypes.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <time.h>
#include <unistd.h>
#include <rte_alarm.h>
#include <rte_bpf.h>
#include <rte_config.h>
#include <rte_debug.h>
#include <rte_eal.h>
#include <rte_errno.h>
#include <rte_ethdev.h>
#include <rte_lcore.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_mempool.h>
#include <rte_pcapng.h>
#include <rte_pdump.h>
#include <rte_ring.h>
#include <rte_string_fns.h>
#include <rte_time.h>
#include <rte_version.h>
#include <pcap/pcap.h>
#include <pcap/bpf.h>
#define RING_NAME "capture-ring"
#define MONITOR_INTERVAL (500 * 1000)
#define MBUF_POOL_CACHE_SIZE 32
#define BURST_SIZE 32
#define SLEEP_THRESHOLD 1000
/* command line flags */
static const char *progname;
static bool quit_signal;
static bool group_read;
static bool quiet;
static bool promiscuous_mode = true;
static bool use_pcapng = true;
static char *output_name;
static const char *file_prefix = NULL;
static const char *filter_str;
static unsigned int ring_size = 2048;
static const char *capture_comment;
static uint32_t snaplen = RTE_MBUF_DEFAULT_BUF_SIZE;
static bool dump_bpf;
static struct {
uint64_t duration; /* nanoseconds */
unsigned long packets; /* number of packets in file */
size_t size; /* file size (bytes) */
} stop;
/* Running state */
static struct rte_bpf_prm *bpf_prm;
static uint64_t start_time, end_time;
static uint64_t packets_received;
static size_t file_size;
struct interface {
TAILQ_ENTRY(interface) next;
uint16_t port;
int old_promiscuous_mode; /* 保留设备原本状态 */
char name[RTE_ETH_NAME_MAX_LEN];
struct rte_rxtx_callback *rx_cb[RTE_MAX_QUEUES_PER_PORT];
};
TAILQ_HEAD(interface_list, interface);
static struct interface_list interfaces = TAILQ_HEAD_INITIALIZER(interfaces);
static struct interface *port2intf[RTE_MAX_ETHPORTS];
/* Can do either pcap or pcapng format output */
typedef union {
rte_pcapng_t *pcapng;
pcap_dumper_t *dumper;
} dumpcap_out_t;
static void usage(void)
{
printf("Usage: %s [options] ...\n\n", progname);
printf("DPDK args:\n"
" -x <file-prefix>, --file-prefix <file-prefix>\n"
" Prefix for hugepage filenames\n");
printf("Capture Interface:\n"
" -i <interface> name or port index of interface\n"
" -f <capture filter> packet filter in libpcap filter syntax\n");
printf(" -s <snaplen>, --snapshot-length <snaplen>\n"
" packet snapshot length (def: %u)\n",
RTE_MBUF_DEFAULT_BUF_SIZE);
printf(" -p, --no-promiscuous-mode\n"
" don't capture in promiscuous mode\n"
" -D, --list-interfaces print list of interfaces and exit\n"
" -d print generated BPF code for capture filter\n"
"\n"
"Stop conditions:\n"
" -c <packet count> stop after n packets (def: infinite)\n"
" -a <autostop cond.> ..., --autostop <autostop cond.> ...\n"
" duration:NUM - stop after NUM seconds\n"
" filesize:NUM - stop this file after NUM kB\n"
" packets:NUM - stop after NUM packets\n"
"Output (files):\n"
" -w <filename> name of file to save (def: tempfile)\n"
" -g enable group read access on the output file(s)\n"
" -n use pcapng format instead of pcap (default)\n"
" -P use libpcap format instead of pcapng\n"
" --capture-comment <comment>\n"
" add a capture comment to the output file\n"
"\n"
"Miscellaneous:\n"
" -q don't report packet capture counts\n"
" -v, --version print version information and exit\n"
" -h, --help display this help and exit\n"
"\n"
"Use Ctrl-C to stop capturing at any time.\n");
}
static const char *version(void)
{
static char str[128];
snprintf(str, sizeof(str),
"%s 1.0 (%s)\n", progname, rte_version());
return str;
}
/* Parse numeric argument from command line */
static unsigned long get_uint(const char *arg, const char *name,
unsigned int limit)
{
unsigned long u;
char *endp;
u = strtoul(arg, &endp, 0);
if (*arg == '\0' || *endp != '\0')
rte_exit(EXIT_FAILURE,
"Specified %s \"%s\" is not a valid number\n",
name, arg);
if (limit && u > limit)
rte_exit(EXIT_FAILURE,
"Specified %s \"%s\" is too large (greater than %u)\n",
name, arg, limit);
return u;
}
/* Set auto stop values */
static void auto_stop(char *opt)
{
char *value, *endp;
value = strchr(opt, ':');
if (value == NULL)
rte_exit(EXIT_FAILURE,
"Missing colon in auto stop parameter\n");
*value++ = '\0';
if (strcmp(opt, "duration") == 0) {
double interval = strtod(value, &endp);
if (*value == '\0' || *endp != '\0' || interval <= 0)
rte_exit(EXIT_FAILURE,
"Invalid duration \"%s\"\n", value);
stop.duration = NSEC_PER_SEC * interval;
} else if (strcmp(opt, "filesize") == 0) {
stop.size = get_uint(value, "filesize", 0) * 1024;
} else if (strcmp(opt, "packets") == 0) {
stop.packets = get_uint(value, "packets", 0);
} else {
rte_exit(EXIT_FAILURE,
"Unknown autostop parameter \"%s\"\n", opt);
}
}
/* Add interface to list of interfaces to capture */
static void add_interface(uint16_t port, const char *name)
{
struct interface *intf;
intf = malloc(sizeof(*intf));
if (!intf)
rte_exit(EXIT_FAILURE, "no memory for interface\n");
memset(intf, 0, sizeof(*intf));
rte_strscpy(intf->name, name, sizeof(intf->name));
printf("Capturing on '%s'\n", name);
port2intf[port] = intf;
TAILQ_INSERT_TAIL(&interfaces, intf, next);
}
/* Select all valid DPDK interfaces */
static void select_all_interfaces(void)
{
char name[RTE_ETH_NAME_MAX_LEN];
uint16_t p;
RTE_ETH_FOREACH_DEV(p) {
if (rte_eth_dev_get_name_by_port(p, name) < 0)
continue;
add_interface(p, name);
}
}
/*
* Choose interface to capture if no -i option given.
* Select the first DPDK port, this matches what dumpcap does.
*/
static void set_default_interface(void)
{
char name[RTE_ETH_NAME_MAX_LEN];
uint16_t p;
RTE_ETH_FOREACH_DEV(p) {
if (rte_eth_dev_get_name_by_port(p, name) < 0)
continue;
add_interface(p, name);
return;
}
rte_exit(EXIT_FAILURE, "No usable interfaces found\n");
}
/* Lookup interface by name or port and add it to the list */
static void select_interface(const char *arg)
{
uint16_t port;
if (strcmp(arg, "*"))
select_all_interfaces();
else if (rte_eth_dev_get_port_by_name(arg, &port) == 0)
add_interface(port, arg);
else {
char name[RTE_ETH_NAME_MAX_LEN];
port = get_uint(arg, "port_number", UINT16_MAX);
if (rte_eth_dev_get_name_by_port(port, name) < 0)
rte_exit(EXIT_FAILURE, "Invalid port number %u\n",
port);
add_interface(port, name);
}
}
/* Display list of possible interfaces that can be used. */
static void show_interfaces(void)
{
char name[RTE_ETH_NAME_MAX_LEN];
uint16_t p;
RTE_ETH_FOREACH_DEV(p) {
if (rte_eth_dev_get_name_by_port(p, name) < 0)
continue;
printf("%u. %s\n", p, name);
}
}
static void compile_filter(void)
{
struct bpf_program bf;
pcap_t *pcap;
pcap = pcap_open_dead(DLT_EN10MB, snaplen);
if (!pcap)
rte_exit(EXIT_FAILURE, "can not open pcap\n");
if (pcap_compile(pcap, &bf, filter_str,
1, PCAP_NETMASK_UNKNOWN) != 0)
rte_exit(EXIT_FAILURE, "pcap filter string not valid (%s)\n",
pcap_geterr(pcap));
bpf_prm = rte_bpf_convert(&bf);
if (bpf_prm == NULL)
rte_exit(EXIT_FAILURE,
"bpf convert failed: %s(%d)\n",
rte_strerror(rte_errno), rte_errno);
if (dump_bpf) {
printf("cBPF program (%u insns)\n", bf.bf_len);
bpf_dump(&bf, 1);
printf("\neBPF program (%u insns)\n", bpf_prm->nb_ins);
rte_bpf_dump(stdout, bpf_prm->ins, bpf_prm->nb_ins);
exit(0);
}
/* Don't care about original program any more */
pcap_freecode(&bf);
pcap_close(pcap);
}
/*
* Parse command line options.
* These are chosen to be similar to dumpcap command.
*/
static void parse_opts(int argc, char **argv)
{
static const struct option long_options[] = {
{ "autostop", required_argument, NULL, 'a' },
{ "capture-comment", required_argument, NULL, 0 },
{ "help", no_argument, NULL, 'h' },
{ "interface", required_argument, NULL, 'i' },
{ "list-interfaces", no_argument, NULL, 'D' },
{ "no-promiscuous-mode", no_argument, NULL, 'p' },
{ "output-file", required_argument, NULL, 'w' },
{ "ring-buffer", required_argument, NULL, 'b' },
{ "snapshot-length", required_argument, NULL, 's' },
{ "version", no_argument, NULL, 'v' },
{ "file-prefix", required_argument, NULL, 'x' },
{ NULL },
};
int option_index, c;
for (;;) {
c = getopt_long(argc, argv, "a:b:c:dDf:ghi:nN:pPqs:vw:x:",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 0:
switch (option_index) {
case 0:
capture_comment = optarg;
break;
default:
usage();
exit(1);
}
break;
case 'a':
auto_stop(optarg);
break;
case 'b':
rte_exit(EXIT_FAILURE,
"multiple files not implemented\n");
break;
case 'c':
stop.packets = get_uint(optarg, "packet_count", 0);
break;
case 'd':
dump_bpf = true;
break;
case 'D':
show_interfaces();
exit(0);
case 'f':
filter_str = optarg;
break;
case 'g':
group_read = true;
break;
case 'h':
printf("%s\n\n", version());
usage();
exit(0);
case 'i':
select_interface(optarg);
break;
case 'n':
use_pcapng = true;
break;
case 'N':
ring_size = get_uint(optarg, "packet_limit", 0);
break;
case 'p':
promiscuous_mode = false;
break;
case 'P':
use_pcapng = false;
break;
case 'q':
quiet = true;
break;
case 's':
snaplen = get_uint(optarg, "snap_len", 0);
break;
case 'w':
output_name = optarg;
break;
case 'x':
file_prefix = optarg;
break;
case 'v':
printf("%s\n", version());
exit(0);
default:
fprintf(stderr, "Invalid option: %s\n",
argv[optind - 1]);
usage();
exit(1);
}
}
}
static void
signal_handler(int sig_num __rte_unused)
{
__atomic_store_n(&quit_signal, true, __ATOMIC_RELAXED);
}
/* Return the time since 1/1/1970 in nanoseconds */
static uint64_t create_timestamp(void)
{
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
return rte_timespec_to_ns(&now);
}
static void
cleanup_pdump_resources(void)
{
struct interface *intf;
TAILQ_FOREACH(intf, &interfaces, next) {
rte_pdump_disable(intf->port,
RTE_PDUMP_ALL_QUEUES, RTE_PDUMP_FLAG_RXTX);
if (promiscuous_mode && !intf->old_promiscuous_mode)
rte_eth_promiscuous_disable(intf->port);
}
}
/* Alarm signal handler, used to check that primary process */
static void
monitor_primary(void *arg __rte_unused)
{
if (__atomic_load_n(&quit_signal, __ATOMIC_RELAXED))
return;
if (rte_eal_primary_proc_alive(NULL)) {
rte_eal_alarm_set(MONITOR_INTERVAL, monitor_primary, NULL);
} else {
fprintf(stderr,
"Primary process is no longer active, exiting...\n");
__atomic_store_n(&quit_signal, true, __ATOMIC_RELAXED);
}
}
/* Setup handler to check when primary exits. */
static void
enable_primary_monitor(void)
{
int ret;
/* Once primary exits, so will pdump. */
ret = rte_eal_alarm_set(MONITOR_INTERVAL, monitor_primary, NULL);
if (ret < 0)
fprintf(stderr, "Fail to enable monitor:%d\n", ret);
}
static void
disable_primary_monitor(void)
{
int ret;
ret = rte_eal_alarm_cancel(monitor_primary, NULL);
if (ret < 0)
fprintf(stderr, "Fail to disable monitor:%d\n", ret);
}
static void
report_packet_stats(dumpcap_out_t out)
{
struct rte_pdump_stats pdump_stats;
struct interface *intf;
uint64_t ifrecv, ifdrop;
double percent;
fputc('\n', stderr);
TAILQ_FOREACH(intf, &interfaces, next) {
if (rte_pdump_stats(intf->port, &pdump_stats) < 0)
continue;
/* do what Wiretap does */
ifrecv = pdump_stats.accepted + pdump_stats.filtered;
ifdrop = pdump_stats.nombuf + pdump_stats.ringfull;
if (use_pcapng)
rte_pcapng_write_stats(out.pcapng, intf->port, NULL,
start_time, end_time,
ifrecv, ifdrop);
if (ifrecv == 0)
percent = 0;
else
percent = 100. * ifrecv / (ifrecv + ifdrop);
fprintf(stderr,
"Packets received/dropped on interface '%s': "
"%"PRIu64 "/%" PRIu64 " (%.1f)\n",
intf->name, ifrecv, ifdrop, percent);
}
}
/*
* Start DPDK EAL with arguments.
* Unlike most DPDK programs, this application does not use the
* typical EAL command line arguments.
* We don't want to expose all the DPDK internals to the user.
*/
static void dpdk_init(void)
{
static const char * const args[] = {
"dumpcap", "--proc-type", "secondary",
"--log-level", "notice"
};
int eal_argc = RTE_DIM(args);
char **eal_argv;
int i;
if(file_prefix != NULL){
eal_argc += 2;
}
/* DPDK API requires mutable versions of command line arguments. */
eal_argv = calloc(eal_argc + 1, sizeof(char *));
if (eal_argv == NULL)
rte_panic("No memory\n");
eal_argv[0] = strdup(progname);
for (i = 1; i < RTE_DIM(args); i++)
eal_argv[i] = strdup(args[i]);
if(file_prefix != NULL){
eal_argv[i] = strdup("--file-prefix");
eal_argv[i + 1] = strdup(file_prefix);
}
for(i = 0; i < eal_argc; ++i){
printf("%s ", eal_argv[i]);
}
printf("\n");
if (rte_eal_init(eal_argc, eal_argv) < 0)
rte_exit(EXIT_FAILURE, "EAL init failed: is primary process running?\n");
if (rte_eth_dev_count_avail() == 0)
rte_exit(EXIT_FAILURE, "No Ethernet ports found\n");
}
/* Create packet ring shared between callbacks and process */
static struct rte_ring *create_ring(void)
{
struct rte_ring *ring;
size_t size, log2;
/* Find next power of 2 >= size. */
size = ring_size;
log2 = sizeof(size) * 8 - __builtin_clzl(size - 1);
size = 1u << log2;
if (size != ring_size) {
fprintf(stderr, "Ring size %u rounded up to %zu\n",
ring_size, size);
ring_size = size;
}
ring = rte_ring_lookup(RING_NAME);
if (ring == NULL) {
ring = rte_ring_create(RING_NAME, ring_size,
rte_socket_id(), 0);
if (ring == NULL)
rte_exit(EXIT_FAILURE, "Could not create ring :%s\n",
rte_strerror(rte_errno));
}
return ring;
}
static struct rte_mempool *create_mempool(void)
{
static const char pool_name[] = "capture_mbufs";
size_t num_mbufs = 2 * ring_size;
struct rte_mempool *mp;
mp = rte_mempool_lookup(pool_name);
if (mp)
return mp;
mp = rte_pktmbuf_pool_create_by_ops(pool_name, num_mbufs,
MBUF_POOL_CACHE_SIZE, 0,
rte_pcapng_mbuf_size(snaplen),
rte_socket_id(), "ring_mp_sc");
if (mp == NULL)
rte_exit(EXIT_FAILURE,
"Mempool (%s) creation failed: %s\n", pool_name,
rte_strerror(rte_errno));
return mp;
}
/*
* Get Operating System information.
* Returns an string allocated via malloc().
*/
static char *get_os_info(void)
{
struct utsname uts;
char *osname = NULL;
if (uname(&uts) < 0)
return NULL;
if (asprintf(&osname, "%s %s",
uts.sysname, uts.release) == -1)
return NULL;
return osname;
}
static dumpcap_out_t create_output(void)
{
dumpcap_out_t ret;
static char tmp_path[PATH_MAX];
int fd;
/* If no filename specified make a tempfile name */
if (output_name == NULL) {
struct interface *intf;
struct tm *tm;
time_t now;
char ts[32];
intf = TAILQ_FIRST(&interfaces);
now = time(NULL);
tm = localtime(&now);
if (!tm)
rte_panic("localtime failed\n");
strftime(ts, sizeof(ts), "%Y%m%d%H%M%S", tm);
snprintf(tmp_path, sizeof(tmp_path),
"/tmp/%s_%u_%s_%s.%s",
progname, intf->port, intf->name, ts,
use_pcapng ? "pcapng" : "pcap");
output_name = tmp_path;
}
if (strcmp(output_name, "-") == 0)
fd = STDOUT_FILENO;
else {
mode_t mode = group_read ? 0640 : 0600;
fd = open(output_name, O_WRONLY | O_CREAT, mode);
if (fd < 0)
rte_exit(EXIT_FAILURE, "Can not open \"%s\": %s\n",
output_name, strerror(errno));
}
if (use_pcapng) {
char *os = get_os_info();
ret.pcapng = rte_pcapng_fdopen(fd, os, NULL,
version(), capture_comment);
if (ret.pcapng == NULL)
rte_exit(EXIT_FAILURE, "pcapng_fdopen failed: %s\n",
strerror(rte_errno));
free(os);
} else {
pcap_t *pcap;
pcap = pcap_open_dead_with_tstamp_precision(DLT_EN10MB, snaplen,
PCAP_TSTAMP_PRECISION_NANO);
if (pcap == NULL)
rte_exit(EXIT_FAILURE, "pcap_open_dead failed\n");
ret.dumper = pcap_dump_fopen(pcap, fdopen(fd, "w"));
if (ret.dumper == NULL)
rte_exit(EXIT_FAILURE, "pcap_dump_fopen failed: %s\n",
pcap_geterr(pcap));
}
return ret;
}
static void enable_pdump(struct rte_ring *r, struct rte_mempool *mp)
{
struct interface *intf;
uint32_t flags;
int ret;
flags = RTE_PDUMP_FLAG_RXTX;
if (use_pcapng)
flags |= RTE_PDUMP_FLAG_PCAPNG;
TAILQ_FOREACH(intf, &interfaces, next) {
if (promiscuous_mode) {
intf->old_promiscuous_mode = rte_eth_promiscuous_get(intf->port);
ret = rte_eth_promiscuous_enable(intf->port);
if (ret != 0)
fprintf(stderr,
"port %u set promiscuous enable failed: %d\n",
intf->port, ret);
}
ret = rte_pdump_enable_bpf(intf->port, RTE_PDUMP_ALL_QUEUES,
flags, snaplen,
r, mp, bpf_prm);
if (ret < 0)
rte_exit(EXIT_FAILURE,
"Packet dump enable failed: %s\n",
rte_strerror(-ret));
}
}
/*
* Show current count of captured packets
* with backspaces to overwrite last value.
*/
static void show_count(uint64_t count)
{
unsigned int i;
static unsigned int bt;
for (i = 0; i < bt; i++)
fputc('\b', stderr);
bt = fprintf(stderr, "%"PRIu64" ", count);
}
/* Write multiple packets in older pcap format */
static ssize_t
pcap_write_packets(pcap_dumper_t *dumper,
struct rte_mbuf *pkts[], uint16_t n)
{
uint8_t temp_data[snaplen];
struct pcap_pkthdr header;
uint16_t i;
size_t total = 0;
gettimeofday(&header.ts, NULL);
for (i = 0; i < n; i++) {
struct rte_mbuf *m = pkts[i];
header.len = rte_pktmbuf_pkt_len(m);
header.caplen = RTE_MIN(header.len, snaplen);
pcap_dump((u_char *)dumper, &header,
rte_pktmbuf_read(m, 0, header.caplen, temp_data));
total += sizeof(header) + header.len;
}
return total;
}
/* Process all packets in ring and dump to capture file */
static int process_ring(dumpcap_out_t out, struct rte_ring *r, int all)
{
struct rte_mbuf *pkts[BURST_SIZE];
unsigned int avail, n;
static unsigned int empty_count;
ssize_t written;
again:
n = rte_ring_sc_dequeue_burst(r, (void **) pkts, BURST_SIZE,
&avail);
if (n == 0) {
/* don't consume endless amounts of cpu if idle */
if (empty_count < SLEEP_THRESHOLD)
++empty_count;
else
usleep(10);
return 0;
}
empty_count = (avail == 0);
if (use_pcapng)
written = rte_pcapng_write_packets(out.pcapng, pkts, n);
else
written = pcap_write_packets(out.dumper, pkts, n);
rte_pktmbuf_free_bulk(pkts, n);
if (written < 0)
return -1;
file_size += written;
packets_received += n;
if(all){
if(avail != 0) goto again;
}
if (!quiet)
show_count(packets_received);
return 0;
}
int main(int argc, char **argv)
{
struct rte_ring *r;
struct rte_mempool *mp;
dumpcap_out_t out;
progname = argv[0];
parse_opts(argc, argv);
dpdk_init();
if (filter_str)
compile_filter();
if (TAILQ_EMPTY(&interfaces))
set_default_interface();
r = create_ring();
mp = create_mempool();
out = create_output();
start_time = create_timestamp();
enable_pdump(r, mp);
signal(SIGINT, signal_handler);
signal(SIGPIPE, SIG_IGN);
enable_primary_monitor();
if (!quiet) {
fprintf(stderr, "Packets captured: ");
show_count(0);
}
while (!__atomic_load_n(&quit_signal, __ATOMIC_RELAXED)) {
if (process_ring(out, r, 0) < 0) {
fprintf(stderr, "pcapng file write failed; %s\n",
strerror(errno));
break;
}
if (stop.size && file_size >= stop.size)
break;
if (stop.packets && packets_received >= stop.packets)
break;
if (stop.duration != 0 &&
create_timestamp() - start_time > stop.duration)
break;
}
cleanup_pdump_resources();
process_ring(out, r, 1);
end_time = create_timestamp();
disable_primary_monitor();
if (rte_eal_primary_proc_alive(NULL))
report_packet_stats(out);
if (use_pcapng)
rte_pcapng_close(out.pcapng);
else
pcap_dump_close(out.dumper);
rte_free(bpf_filter);
rte_ring_free(r);
rte_mempool_free(mp);
return rte_eal_cleanup() ? EXIT_FAILURE : 0;
}