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format_ndag.c
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/*
*
* Copyright (c) 2007-2017 The University of Waikato, Hamilton, New Zealand.
* All rights reserved.
*
* This file is part of libtrace.
*
* This code has been developed by the University of Waikato WAND
* research group. For further information please see http://www.wand.net.nz/
*
* libtrace is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* libtrace 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include "config.h"
#include "common.h"
#include "libtrace.h"
#include "libtrace_int.h"
#include "format_helper.h"
#include "format_erf.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include "format_ndag.h"
#define NDAG_IDLE_TIMEOUT (600)
#define ENCAP_BUFSIZE (65536)
#define CTRL_BUF_SIZE (10000)
#define ENCAP_BUFFERS (1000)
#define RECV_BATCH_SIZE (50)
#define FORMAT_DATA ((ndag_format_data_t *)libtrace->format_data)
static struct libtrace_format_t ndag;
volatile int ndag_paused = 0;
enum {
NDAG_SOCKET_TYPE_MULTICAST,
NDAG_SOCKET_TYPE_TCP,
};
typedef struct monitor {
uint16_t monitorid;
uint64_t laststart;
} ndag_monitor_t;
typedef struct streamsource {
uint16_t monitor;
char *groupaddr;
char *localiface;
uint16_t port;
} streamsource_t;
typedef struct streamsock {
uint8_t socktype;
char *groupaddr;
int sock;
struct addrinfo *srcaddr;
uint16_t port;
uint32_t expectedseq;
ndag_monitor_t *monitorptr;
char **saved;
char *nextread;
int nextreadind;
int nextwriteind;
uint16_t nextrlen;
int savedsize[ENCAP_BUFFERS];
int expectedreccount;
uint8_t rectype;
uint64_t nextts;
uint32_t startidle;
uint64_t total_recordcount;
int reccount;
int bufavail;
int bufwaiting;
#if HAVE_DECL_RECVMMSG
struct mmsghdr mmsgbufs[RECV_BATCH_SIZE];
#endif
struct msghdr singlemsg;
} streamsock_t;
typedef struct recvstream {
streamsock_t *sources;
uint16_t sourcecount;
libtrace_message_queue_t mqueue;
int threadindex;
ndag_monitor_t *knownmonitors;
uint16_t monitorcount;
uint64_t dropped_upstream;
uint64_t missing_records;
uint64_t received_packets;
int maxfd;
uint8_t halted;
} recvstream_t;
typedef struct ndag_format_data {
char *multicastgroup;
char *portstr;
char *localiface;
uint16_t nextthreadid;
recvstream_t *receivers;
int receiver_cnt;
uint8_t socktype;
pthread_t controlthread;
libtrace_message_queue_t controlqueue;
int consterfframing;
} ndag_format_data_t;
enum {
NDAG_CLIENT_HALT = 0x01,
NDAG_CLIENT_RESTARTED = 0x02, // redundant
NDAG_CLIENT_NEWGROUP = 0x03
};
typedef struct ndagreadermessage {
uint8_t type;
streamsource_t contents;
} ndag_internal_message_t;
#define NEXT_BUFFER(ssock, nr) \
ssock->savedsize[nr] = 0; \
ssock->bufwaiting++; \
nr++; \
if (nr == ENCAP_BUFFERS) { \
nr = 0; \
} \
ssock->nextread = ssock->saved[nr]; \
ssock->nextreadind = nr;
static inline int seq_cmp(uint32_t seq_a, uint32_t seq_b)
{
/* Calculate seq_a - seq_b, taking wraparound into account */
if (seq_a == seq_b)
return 0;
if (seq_a > seq_b) {
return (int)(seq_a - seq_b);
}
/* -1 for the wrap and another -1 because we don't use zero */
return (int)(0xffffffff - ((seq_b - seq_a) - 2));
}
static uint8_t check_ndag_header(char *msgbuf, uint32_t msgsize)
{
ndag_common_t *header = (ndag_common_t *)msgbuf;
if (msgsize < sizeof(ndag_common_t)) {
fprintf(stderr, "nDAG message does not have a complete nDAG header.\n");
return 0;
}
if (ntohl(header->magic) != NDAG_MAGIC_NUMBER) {
fprintf(stderr, "nDAG message does not have a valid magic number.\n");
return 0;
}
if (header->version > NDAG_EXPORT_VERSION || header->version == 0) {
fprintf(stderr, "nDAG message has an invalid header version: %u\n",
header->version);
return 0;
}
return header->type;
}
static inline void reset_expected_seqs(recvstream_t *rt, ndag_monitor_t *mon)
{
int i;
for (i = 0; i < rt->sourcecount; i++) {
if (rt->sources[i].monitorptr == mon) {
rt->sources[i].expectedseq = 0;
}
}
}
static int join_multicast_group(char *groupaddr, char *localiface,
char *portstr, uint16_t portnum,
struct addrinfo **srcinfo)
{
struct addrinfo hints;
struct addrinfo *gotten;
struct addrinfo *group;
unsigned int interface;
char pstr[16];
struct group_req greq;
int bufsize, val;
uint32_t ttlopt = 4; // TODO, add config option for this?
int sock;
if (portstr == NULL) {
snprintf(pstr, 15, "%u", portnum);
portstr = pstr;
}
interface = if_nametoindex(localiface);
if (interface == 0) {
fprintf(stderr, "Failed to lookup interface %s -- %s\n", localiface,
strerror(errno));
return -1;
}
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
hints.ai_protocol = 0;
if (getaddrinfo(groupaddr, portstr, &hints, &gotten) != 0) {
fprintf(stderr, "Call to getaddrinfo failed for %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
return -1;
}
if (getaddrinfo(groupaddr, NULL, &hints, &group) != 0) {
fprintf(stderr, "Call to getaddrinfo failed for %s -- %s\n", groupaddr,
strerror(errno));
return -1;
}
if (srcinfo) {
*srcinfo = gotten;
}
sock = socket(gotten->ai_family, gotten->ai_socktype, 0);
if (sock < 0) {
fprintf(stderr, "Failed to create multicast socket for %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
goto sockcreateover;
}
if (setsockopt(sock,
gotten->ai_family == PF_INET6 ? IPPROTO_IPV6 : IPPROTO_IP,
gotten->ai_family == PF_INET6 ? IPV6_MULTICAST_HOPS
: IP_MULTICAST_TTL,
(char *)&ttlopt, sizeof(ttlopt)) != 0) {
fprintf(stderr, "Failed to set TTL socket option for %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
goto sockcreateover;
}
val = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
fprintf(stderr,
"Failed to set REUSEADDR socket option for %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
goto sockcreateover;
}
if (bind(sock, (struct sockaddr *)gotten->ai_addr, gotten->ai_addrlen) <
0) {
fprintf(stderr, "Failed to bind to multicast socket %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
sock = -1;
goto sockcreateover;
}
memset(&greq, 0, sizeof(greq));
greq.gr_interface = interface;
memcpy(&(greq.gr_group), group->ai_addr, group->ai_addrlen);
if (setsockopt(sock, IPPROTO_IP, MCAST_JOIN_GROUP, &greq, sizeof(greq)) <
0) {
fprintf(stderr, "Failed to join multicast group %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
close(sock);
sock = -1;
goto sockcreateover;
}
bufsize = 16 * 1024 * 1024;
if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &bufsize,
(socklen_t)sizeof(int)) < 0) {
fprintf(
stderr,
"Failed to increase buffer size for multicast group %s:%s -- %s\n",
groupaddr, portstr, strerror(errno));
close(sock);
sock = -1;
goto sockcreateover;
}
sockcreateover:
if (!srcinfo) {
freeaddrinfo(gotten);
}
freeaddrinfo(group);
return sock;
}
static int ndag_init_input(libtrace_t *libtrace)
{
char *scan = NULL;
char *next = NULL;
libtrace->format_data =
(ndag_format_data_t *)malloc(sizeof(ndag_format_data_t));
if (!libtrace->format_data) {
trace_set_err(libtrace, TRACE_ERR_INIT_FAILED,
"Unable to allocate memory for "
"format data inside ndag_init_input()");
return -1;
}
FORMAT_DATA->multicastgroup = NULL;
FORMAT_DATA->portstr = NULL;
FORMAT_DATA->localiface = NULL;
FORMAT_DATA->nextthreadid = 0;
FORMAT_DATA->receivers = NULL;
FORMAT_DATA->receiver_cnt = 0;
FORMAT_DATA->consterfframing = -1;
scan = strchr(libtrace->uridata, ',');
if (scan == NULL) {
trace_set_err(libtrace, TRACE_ERR_BAD_FORMAT,
"Bad ndag URI. Should be ndag:<interface>,<multicast "
"group>,<port number>");
return -1;
}
FORMAT_DATA->localiface =
strndup(libtrace->uridata, (size_t)(scan - libtrace->uridata));
next = scan + 1;
scan = strchr(next, ',');
if (scan == NULL) {
FORMAT_DATA->portstr = strdup("9001");
FORMAT_DATA->multicastgroup = strdup(next);
} else {
FORMAT_DATA->multicastgroup = strndup(next, (size_t)(scan - next));
FORMAT_DATA->portstr = strdup(scan + 1);
}
return 0;
}
static int ndag_config_input(libtrace_t *libtrace, trace_option_t option,
void *value)
{
switch (option) {
case TRACE_OPTION_CONSTANT_ERF_FRAMING:
FORMAT_DATA->consterfframing = *(int *)value;
break;
case TRACE_OPTION_EVENT_REALTIME:
case TRACE_OPTION_SNAPLEN:
case TRACE_OPTION_PROMISC:
case TRACE_OPTION_FILTER:
case TRACE_OPTION_META_FREQ:
default:
trace_set_err(libtrace, TRACE_ERR_OPTION_UNAVAIL,
"Unsupported option %d", option);
return -1;
}
return 0;
}
static void new_group_alert(libtrace_t *libtrace, uint16_t threadid,
uint16_t portnum, uint16_t monid)
{
ndag_internal_message_t alert;
memset(&alert, 0, sizeof(alert));
alert.type = NDAG_CLIENT_NEWGROUP;
alert.contents.groupaddr = FORMAT_DATA->multicastgroup;
alert.contents.localiface = FORMAT_DATA->localiface;
alert.contents.port = portnum;
alert.contents.monitor = monid;
libtrace_message_queue_put(&(FORMAT_DATA->receivers[threadid].mqueue),
(void *)&alert);
}
static int ndag_parse_control_message(libtrace_t *libtrace, char *msgbuf,
int msgsize, uint16_t *ptmap)
{
int i;
ndag_common_t *ndaghdr = (ndag_common_t *)msgbuf;
uint8_t msgtype;
msgtype = check_ndag_header(msgbuf, (uint32_t)msgsize);
if (msgtype == 0) {
return -1;
}
msgsize -= sizeof(ndag_common_t);
if (msgtype == NDAG_PKT_BEACON) {
/* If message is a beacon, make sure every port included in the
* beacon is assigned to a receive thread.
*/
uint16_t *ptr, numstreams;
if ((uint32_t)msgsize < sizeof(uint16_t)) {
fprintf(stderr, "Malformed beacon (missing number of streams).\n");
return -1;
}
ptr = (uint16_t *)(msgbuf + sizeof(ndag_common_t));
numstreams = ntohs(*ptr);
ptr++;
if ((uint32_t)msgsize < ((numstreams + 1) * sizeof(uint16_t))) {
fprintf(
stderr,
"Malformed beacon (length doesn't match number of streams).\n");
fprintf(stderr, "%u %u\n", msgsize, numstreams);
return -1;
}
for (i = 0; i < numstreams; i++) {
uint16_t streamport = ntohs(*ptr);
if (ptmap[streamport] == 0xffff) {
new_group_alert(libtrace, FORMAT_DATA->nextthreadid, streamport,
ntohs(ndaghdr->monitorid));
ptmap[streamport] = FORMAT_DATA->nextthreadid;
if (libtrace->perpkt_thread_count == 0) {
FORMAT_DATA->nextthreadid = 0;
} else {
FORMAT_DATA->nextthreadid =
((FORMAT_DATA->nextthreadid + 1) %
libtrace->perpkt_thread_count);
}
}
ptr++;
}
} else {
fprintf(stderr, "Unexpected message type on control channel: %u\n",
msgtype);
return -1;
}
return 0;
}
static inline int select_on_sock(int sock)
{
int r;
fd_set read_fds;
struct timeval timeout;
FD_ZERO(&read_fds);
FD_SET(sock, &read_fds);
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
r = select(sock + 1, &read_fds, NULL, NULL, &timeout);
if (r == -1) {
return -1;
}
if (!FD_ISSET(sock, &read_fds)) {
return 0;
}
return 1;
}
static int accept_ndagtcp_connection(libtrace_t *libtrace, char *ipstr,
char *portstr)
{
struct addrinfo hints, *listenai;
int sock, consock = -1, reuse = 1, r;
struct sockaddr_storage sa;
socklen_t addrsize;
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
hints.ai_protocol = 0;
sock = -1;
listenai = NULL;
if (getaddrinfo(ipstr, portstr, &hints, &listenai) != 0) {
fprintf(stderr, "Call to getaddrinfo failed for %s:%s -- %s\n", ipstr,
portstr, strerror(errno));
goto failed;
}
sock = socket(listenai->ai_family, listenai->ai_socktype, 0);
if (sock < 0) {
fprintf(stderr, "Failed to create socket for %s:%s -- %s\n", ipstr,
portstr, strerror(errno));
goto failed;
}
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0) {
fprintf(stderr, "Failed to configure socket for %s:%s -- %s\n", ipstr,
portstr, strerror(errno));
goto failed;
}
if (bind(sock, (struct sockaddr *)listenai->ai_addr, listenai->ai_addrlen) <
0) {
fprintf(stderr, "Failed to bind socket for %s:%s -- %s\n", ipstr,
portstr, strerror(errno));
goto failed;
}
if (listen(sock, 10) < 0) {
fprintf(stderr, "Failed to listen on socket for %s:%s -- %s\n", ipstr,
portstr, strerror(errno));
goto failed;
}
freeaddrinfo(listenai);
listenai = NULL;
fcntl(sock, F_SETFL, O_NONBLOCK);
while (is_halted(libtrace) == -1 && !ndag_paused) {
r = select_on_sock(sock);
if (r < 0) {
fprintf(stderr,
"Error in select while accepting connection on socket for "
"%s:%s -- %s\n",
ipstr, portstr, strerror(errno));
consock = -1;
break;
} else if (r == 0) {
consock = 0;
continue;
}
addrsize = sizeof(struct sockaddr_storage);
consock = accept(sock, (struct sockaddr *)&sa, &addrsize);
if (consock < 0) {
fprintf(stderr,
"Failed to accept connection on socket for %s:%s -- %s\n",
ipstr, portstr, strerror(errno));
goto failed;
}
break;
}
failed:
if (sock >= 0) {
close(sock);
}
if (listenai) {
freeaddrinfo(listenai);
}
return consock;
}
static void _ndag_controller_run(libtrace_t *libtrace, int sock)
{
uint16_t ptmap[65536];
int ret;
/* ptmap is a dirty hack to allow us to quickly check if we've already
* assigned a stream to a thread.
*/
memset(ptmap, 0xff, 65536 * sizeof(uint16_t));
ndag_paused = 0;
while ((is_halted(libtrace) == -1) && !ndag_paused) {
char buf[CTRL_BUF_SIZE];
ret = select_on_sock(sock);
if (ret < 0) {
fprintf(stderr,
"Error while waiting for nDAG control messages: %s\n",
strerror(errno));
break;
} else if (ret == 0) {
continue;
}
ret = recvfrom(sock, buf, CTRL_BUF_SIZE, 0, NULL, NULL);
if (ret < 0) {
fprintf(stderr, "Error while receiving nDAG control message: %s\n",
strerror(errno));
break;
}
if (ret == 0) {
break;
}
if (ndag_parse_control_message(libtrace, buf, ret, ptmap) < 0) {
fprintf(stderr, "Error while parsing nDAG control message.\n");
continue;
}
}
if (sock >= 0) {
close(sock);
}
/* Control channel has fallen over, should probably encourage libtrace
* to halt the receiver threads as well.
*/
if (ret < 0 && is_halted(libtrace) == -1) {
trace_interrupt();
}
}
static void *ndagtcp_controller_run(void *tdata)
{
libtrace_t *libtrace = (libtrace_t *)tdata;
int sock = -1;
ndag_paused = 0;
while (is_halted(libtrace) == -1 && !ndag_paused) {
sock = accept_ndagtcp_connection(libtrace, FORMAT_DATA->multicastgroup,
FORMAT_DATA->portstr);
if (sock == -1) {
trace_set_err(libtrace, TRACE_ERR_INIT_FAILED,
"Unable to setup control channel for nDAG TCP");
trace_interrupt();
} else if (sock == 0) {
continue;
} else {
_ndag_controller_run(libtrace, sock);
}
}
pthread_exit(NULL);
}
static void *ndag_controller_run(void *tdata)
{
libtrace_t *libtrace = (libtrace_t *)tdata;
int sock = -1;
sock = join_multicast_group(FORMAT_DATA->multicastgroup,
FORMAT_DATA->localiface, FORMAT_DATA->portstr,
0, NULL);
if (sock == -1) {
trace_set_err(libtrace, TRACE_ERR_INIT_FAILED,
"Unable to setup control channel for nDAG TCP");
trace_interrupt();
} else {
_ndag_controller_run(libtrace, sock);
}
pthread_exit(NULL);
}
static int ndag_start_threads(libtrace_t *libtrace, uint32_t maxthreads,
uint8_t socktype)
{
int ret;
uint32_t i;
/* Configure the set of receiver threads */
if (FORMAT_DATA->receivers == NULL) {
/* What if the number of threads changes between a pause and
* a restart? Can this happen? */
FORMAT_DATA->receivers =
(recvstream_t *)malloc(sizeof(recvstream_t) * maxthreads);
}
for (i = 0; i < maxthreads; i++) {
FORMAT_DATA->receivers[i].sources = NULL;
FORMAT_DATA->receivers[i].sourcecount = 0;
FORMAT_DATA->receivers[i].halted = 0;
FORMAT_DATA->receivers[i].knownmonitors = NULL;
FORMAT_DATA->receivers[i].monitorcount = 0;
FORMAT_DATA->receivers[i].threadindex = i;
FORMAT_DATA->receivers[i].dropped_upstream = 0;
FORMAT_DATA->receivers[i].received_packets = 0;
FORMAT_DATA->receivers[i].missing_records = 0;
FORMAT_DATA->receivers[i].maxfd = -1;
libtrace_message_queue_init(&(FORMAT_DATA->receivers[i].mqueue),
sizeof(ndag_internal_message_t));
}
FORMAT_DATA->receiver_cnt = maxthreads;
/* Start the controller thread */
/* TODO consider affinity of this thread? */
if (socktype == NDAG_SOCKET_TYPE_MULTICAST) {
ret = pthread_create(&(FORMAT_DATA->controlthread), NULL,
ndag_controller_run, libtrace);
} else if (socktype == NDAG_SOCKET_TYPE_TCP) {
ret = pthread_create(&(FORMAT_DATA->controlthread), NULL,
ndagtcp_controller_run, libtrace);
} else {
ret = -1;
}
if (ret != 0) {
return -1;
}
return maxthreads;
}
static int ndag_start_input(libtrace_t *libtrace)
{
FORMAT_DATA->socktype = NDAG_SOCKET_TYPE_MULTICAST;
return ndag_start_threads(libtrace, 1, NDAG_SOCKET_TYPE_MULTICAST);
}
static int ndagtcp_start_input(libtrace_t *libtrace)
{
FORMAT_DATA->socktype = NDAG_SOCKET_TYPE_TCP;
return ndag_start_threads(libtrace, 1, NDAG_SOCKET_TYPE_TCP);
}
static int ndag_pstart_input(libtrace_t *libtrace)
{
FORMAT_DATA->socktype = NDAG_SOCKET_TYPE_MULTICAST;
if (ndag_start_threads(libtrace, libtrace->perpkt_thread_count,
NDAG_SOCKET_TYPE_MULTICAST) ==
libtrace->perpkt_thread_count) {
return 0;
}
return -1;
}
static int ndagtcp_pstart_input(libtrace_t *libtrace)
{
FORMAT_DATA->socktype = NDAG_SOCKET_TYPE_TCP;
if (ndag_start_threads(libtrace, libtrace->perpkt_thread_count,
NDAG_SOCKET_TYPE_TCP) ==
libtrace->perpkt_thread_count) {
return 0;
}
return -1;
}
static void free_streamsock_data(streamsock_t *src)
{
int j;
if (src->saved) {
for (j = 0; j < ENCAP_BUFFERS; j++) {
if (src->saved[j]) {
free(src->saved[j]);
}
}
free(src->saved);
}
#if HAVE_DECL_RECVMMSG
for (j = 0; j < RECV_BATCH_SIZE; j++) {
if (src->mmsgbufs[j].msg_hdr.msg_iov) {
free(src->mmsgbufs[j].msg_hdr.msg_iov);
}
}
#endif
if (src->singlemsg.msg_iov) {
free(src->singlemsg.msg_iov);
}
if (src->srcaddr) {
freeaddrinfo(src->srcaddr);
}
if (src->sock != -1) {
close(src->sock);
}
}
static void halt_ndag_receiver(recvstream_t *receiver)
{
int i;
receiver->halted = 1;
usleep(200000);
libtrace_message_queue_destroy(&(receiver->mqueue));
if (receiver->sources == NULL)
return;
for (i = 0; i < receiver->sourcecount; i++) {
streamsock_t *src = &(receiver->sources[i]);
free_streamsock_data(src);
}
if (receiver->knownmonitors) {
free(receiver->knownmonitors);
}
if (receiver->sources) {
free(receiver->sources);
}
}
static int ndag_pause_input(libtrace_t *libtrace)
{
int i;
ndag_paused = 1;
pthread_join(FORMAT_DATA->controlthread, NULL);
/* Close the existing receiver sockets */
for (i = 0; i < FORMAT_DATA->receiver_cnt; i++) {
halt_ndag_receiver(&(FORMAT_DATA->receivers[i]));
}
return 0;
}
static int ndag_fin_input(libtrace_t *libtrace)
{
if (FORMAT_DATA->receivers) {
free(FORMAT_DATA->receivers);
}
if (FORMAT_DATA->multicastgroup) {
free(FORMAT_DATA->multicastgroup);
}
if (FORMAT_DATA->portstr) {
free(FORMAT_DATA->portstr);
}
if (FORMAT_DATA->localiface) {
free(FORMAT_DATA->localiface);
}
free(libtrace->format_data);
return 0;
}
static int ndag_get_framing_length(const libtrace_packet_t *packet)
{
libtrace_t *libtrace = packet->trace;
if (packet->type == TRACE_RT_DATA_ERF) {
if (FORMAT_DATA->consterfframing >= 0) {
return FORMAT_DATA->consterfframing;
}
return erf_get_framing_length(packet);
}
if (packet->type == TRACE_RT_DATA_CORSARO_TAGGED) {
return sizeof(corsaro_tagged_packet_header_t) -
sizeof(corsaro_packet_tags_t);
}
return 0;
}
static int got_complete_packet(streamsock_t *ssock)
{
unsigned int required, available;
int nr = ssock->nextreadind;
int next;
if (ssock->rectype == NDAG_PKT_ENCAPERF ||
ssock->rectype == NDAG_PKT_CORSAROTAG) {
required = ssock->nextrlen;
} else {
required = 0;
}
if (required == 0) {
return 0;
}
next = ssock->nextreadind;
available = ssock->savedsize[nr] - (ssock->nextread - ssock->saved[nr]);
while (required > available) {
next = ((next + 1) % ENCAP_BUFFERS);
if (ssock->savedsize[next] == 0) {
/* no more data available */
return 0;
}
available += ssock->savedsize[next];
}
return 1;
}
static unsigned int copy_tmp_buffer(streamsock_t *ssock, char *tmpbuf,
unsigned int required)
{
char *ptr = tmpbuf;
int next, first = 1;
unsigned int available;
int nr = ssock->nextreadind;
next = ssock->nextreadind;
available = ssock->savedsize[nr] - (ssock->nextread - ssock->saved[nr]);
while (required > available) {
if (first && available > 0) {
memcpy(ptr, ssock->nextread, available);
ptr += available;
first = 0;
}
next = ((next + 1) % ENCAP_BUFFERS);
if (ssock->savedsize[next] == 0) {
/* no more data available */
return 0;
}
memcpy(ptr, ssock->saved[next], ssock->savedsize[next]);
available += ssock->savedsize[next];
ptr += ssock->savedsize[next];
}
return available;
}
static inline void consume_streamsock_data(streamsock_t *ssock,
unsigned int required)
{
int nr = ssock->nextreadind;
unsigned int available =
(ssock->savedsize[nr] - (ssock->nextread - ssock->saved[nr]));
while (available < required) {
required -= available;
NEXT_BUFFER(ssock, nr)
nr = ssock->nextreadind;
available = ssock->savedsize[nr];
assert(available > 0);
}
ssock->nextread += required;
/* handle the case where we use up the current buffer exactly */
if (ssock->nextread - ssock->saved[nr] >= ssock->savedsize[nr]) {
NEXT_BUFFER(ssock, ssock->nextreadind);
}
}
static int process_ndag_encap_headers(streamsock_t *ssock, recvstream_t *rt)
{
ndag_encap_t *encaphdr;
ndag_monitor_t *mon;
uint8_t rectype;
int nr;
unsigned int available, required;
char tmpbuf[ENCAP_BUFSIZE * 2];
char *usebuf;
nr = ssock->nextreadind;
available = ssock->savedsize[nr] - (ssock->nextread - ssock->saved[nr]);
required = sizeof(ndag_common_t) + sizeof(ndag_encap_t);
usebuf = ssock->nextread;
if (available < required) {
available = copy_tmp_buffer(ssock, tmpbuf, required);
if (available == 0) {
return 0;
}
usebuf = tmpbuf;
}
rectype = check_ndag_header(usebuf, available);
if (rectype == NDAG_PKT_KEEPALIVE) {
consume_streamsock_data(ssock, required);
return process_ndag_encap_headers(ssock, rt);
} else if (rectype != NDAG_PKT_ENCAPERF && rectype != NDAG_PKT_CORSAROTAG) {
fprintf(stderr, "Received invalid record on the channel for %s:%u.\n",
ssock->groupaddr, ssock->port);
return -1;
}
ssock->rectype = rectype;
encaphdr = (ndag_encap_t *)(usebuf + sizeof(ndag_common_t));