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monitor: Add support for writing combined PCAP trace files

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This commit is contained in:
Marcel Holtmann 2014-08-12 19:35:59 -07:00
parent b97c661a97
commit d3f37628b0
5 changed files with 203 additions and 22 deletions
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10
monitor/main.c
View File

@ -38,6 +38,7 @@
#include "monitor/display.h"
static struct nlmon *nlmon = NULL;
static const char *writer_path = NULL;
#define NLA_OK(nla,len) ((len) >= (int) sizeof(struct nlattr) && \
(nla)->nla_len >= sizeof(struct nlattr) && \
@ -83,7 +84,7 @@ static void genl_parse(uint16_t type, const void *data, uint32_t len,
return;
if (!strcmp(name, NL80211_GENL_NAME)) {
nlmon = nlmon_open(ifname, id);
nlmon = nlmon_open(ifname, id, writer_path);
if (!nlmon)
l_main_quit();
}
@ -236,12 +237,14 @@ static void usage(void)
printf("\tiwmon [options]\n");
printf("Options:\n"
"\t-r, --read <file> Read netlink PCAP trace files\n"
"\t-w, --write <file> Write netlink PCAP trace files\n"
"\t-i, --interface <dev> Use specified netlink monitor\n"
"\t-h, --help Show help options\n");
}
static const struct option main_options[] = {
{ "read", required_argument, NULL, 'r' },
{ "write", required_argument, NULL, 'w' },
{ "interface", required_argument, NULL, 'i' },
{ "version", no_argument, NULL, 'v' },
{ "help", no_argument, NULL, 'h' },
@ -260,7 +263,7 @@ int main(int argc, char *argv[])
for (;;) {
int opt;
opt = getopt_long(argc, argv, "r:i:vh", main_options, NULL);
opt = getopt_long(argc, argv, "r:w:i:vh", main_options, NULL);
if (opt < 0)
break;
@ -268,6 +271,9 @@ int main(int argc, char *argv[])
case 'r':
reader_path = optarg;
break;
case 'w':
writer_path = optarg;
break;
case 'i':
ifname = optarg;
break;

85
monitor/nlmon.c
View File

@ -42,6 +42,7 @@
#include "linux/nl80211.h"
#include "src/ie.h"
#include "monitor/pcap.h"
#include "monitor/display.h"
#include "monitor/nlmon.h"
@ -66,6 +67,7 @@ struct nlmon {
struct l_io *io;
struct l_io *pae_io;
struct l_queue *req_list;
struct pcap *pcap;
};
struct nlmon_req {
@ -1489,10 +1491,43 @@ static bool nlmon_req_match(const void *a, const void *b)
return (req->seq == match->seq && req->pid == match->pid);
}
static void store_message(struct nlmon *nlmon, const struct timeval *tv,
const struct tpacket_auxdata *tp,
static void store_packet(struct nlmon *nlmon, const struct timeval *tv,
uint16_t pkt_type,
uint16_t arphrd_type,
uint16_t proto_type,
const void *data, uint32_t size)
{
uint8_t sll_hdr[16], *buf = sll_hdr;
if (!nlmon->pcap)
return;
memset(sll_hdr, 0, sizeof(sll_hdr));
pkt_type = L_CPU_TO_BE16(pkt_type);
L_PUT_UNALIGNED(pkt_type, (uint16_t *) buf);
arphrd_type = L_CPU_TO_BE16(arphrd_type);
L_PUT_UNALIGNED(arphrd_type, (uint16_t *) (buf + 2));
proto_type = L_CPU_TO_BE16(proto_type);
L_PUT_UNALIGNED(proto_type, (uint16_t *) (buf + 14));
pcap_write(nlmon->pcap, tv, &sll_hdr, sizeof(sll_hdr), data, size);
}
static void store_netlink(struct nlmon *nlmon, const struct timeval *tv,
uint16_t proto_type,
const struct nlmsghdr *nlmsg)
{
store_packet(nlmon, tv, PACKET_HOST, ARPHRD_NETLINK, proto_type,
nlmsg, nlmsg->nlmsg_len);
}
static void store_message(struct nlmon *nlmon, const struct timeval *tv,
const struct nlmsghdr *nlmsg)
{
store_netlink(nlmon, tv, NETLINK_GENERIC, nlmsg);
}
static void nlmon_message(struct nlmon *nlmon, const struct timeval *tv,
@ -1528,7 +1563,7 @@ static void nlmon_message(struct nlmon *nlmon, const struct timeval *tv,
return;
}
store_message(nlmon, tv, tp, nlmsg);
store_message(nlmon, tv, nlmsg);
print_message(tv, type, nlmsg->nlmsg_flags, status,
req->cmd, req->version,
NULL, sizeof(status));
@ -1537,8 +1572,11 @@ static void nlmon_message(struct nlmon *nlmon, const struct timeval *tv,
return;
}
if (nlmsg->nlmsg_type != nlmon->id)
if (nlmsg->nlmsg_type != nlmon->id) {
if (nlmsg->nlmsg_type == GENL_ID_CTRL)
store_message(nlmon, tv, nlmsg);
return;
}
if (nlmsg->nlmsg_flags & NLM_F_REQUEST) {
const struct genlmsghdr *genlmsg = NLMSG_DATA(nlmsg);
@ -1554,7 +1592,7 @@ static void nlmon_message(struct nlmon *nlmon, const struct timeval *tv,
l_queue_push_tail(nlmon->req_list, req);
store_message(nlmon, tv, tp, nlmsg);
store_message(nlmon, tv, nlmsg);
print_message(tv, MSG_REQUEST, flags, 0,
req->cmd, req->version,
NLMSG_DATA(nlmsg) + GENL_HDRLEN,
@ -1577,7 +1615,7 @@ static void nlmon_message(struct nlmon *nlmon, const struct timeval *tv,
type = MSG_RESULT;
}
store_message(nlmon, tv, tp, nlmsg);
store_message(nlmon, tv, nlmsg);
print_message(tv, type, nlmsg->nlmsg_flags, 0,
genlmsg->cmd, genlmsg->version,
NLMSG_DATA(nlmsg) + GENL_HDRLEN,
@ -1752,6 +1790,7 @@ static bool nlmon_receive(struct l_io *io, void *user_data)
struct tpacket_auxdata copy_tp;
const struct timeval *tv = NULL;
const struct tpacket_auxdata *tp = NULL;
uint16_t proto_type;
unsigned char buf[8192];
unsigned char control[32];
ssize_t bytes_read;
@ -1783,12 +1822,11 @@ static bool nlmon_receive(struct l_io *io, void *user_data)
return true;
}
if (sll.sll_protocol != htons(NETLINK_GENERIC))
return true;
if (sll.sll_hatype != ARPHRD_NETLINK)
return true;
proto_type = ntohs(sll.sll_protocol);
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
@ -1806,7 +1844,14 @@ static bool nlmon_receive(struct l_io *io, void *user_data)
for (nlmsg = iov.iov_base; NLMSG_OK(nlmsg, bytes_read);
nlmsg = NLMSG_NEXT(nlmsg, bytes_read)) {
nlmon_message(nlmon, tv, tp, nlmsg);
switch (proto_type) {
case NETLINK_ROUTE:
store_netlink(nlmon, tv, proto_type, nlmsg);
break;
case NETLINK_GENERIC:
nlmon_message(nlmon, tv, tp, nlmsg);
break;
}
}
return true;
@ -1989,6 +2034,9 @@ static bool pae_receive(struct l_io *io, void *user_data)
}
}
store_packet(nlmon, tv, sll.sll_pkttype, ARPHRD_ETHER, ETH_P_PAE,
buf, bytes_read);
nlmon_print_pae(nlmon, tv, sll.sll_pkttype, sll.sll_ifindex,
buf, bytes_read);
@ -2020,10 +2068,11 @@ static struct l_io *open_pae(void)
return io;
}
struct nlmon *nlmon_open(const char *ifname, uint16_t id)
struct nlmon *nlmon_open(const char *ifname, uint16_t id, const char *pathname)
{
struct nlmon *nlmon;
struct l_io *io, *pae_io;
struct pcap *pcap;
io = open_packet(ifname);
if (!io)
@ -2035,12 +2084,23 @@ struct nlmon *nlmon_open(const char *ifname, uint16_t id)
return NULL;
}
if (pathname) {
pcap = pcap_create(pathname);
if (!pcap) {
l_io_destroy(pae_io);
l_io_destroy(io);
return NULL;
}
} else
pcap = NULL;
nlmon = l_new(struct nlmon, 1);
nlmon->id = id;
nlmon->io = io;
nlmon->pae_io = pae_io;
nlmon->req_list = l_queue_new();
nlmon->pcap = pcap;
l_io_set_read_handler(nlmon->io, nlmon_receive, nlmon, NULL);
l_io_set_read_handler(nlmon->pae_io, pae_receive, nlmon, NULL);
@ -2057,5 +2117,8 @@ void nlmon_close(struct nlmon *nlmon)
l_io_destroy(nlmon->pae_io);
l_queue_destroy(nlmon->req_list, nlmon_req_free);
if (nlmon->pcap)
pcap_close(nlmon->pcap);
l_free(nlmon);
}

2
monitor/nlmon.h
View File

@ -25,7 +25,7 @@
struct nlmon;
struct nlmon *nlmon_open(const char *ifname, uint16_t id);
struct nlmon *nlmon_open(const char *ifname, uint16_t id, const char *pathname);
void nlmon_close(struct nlmon *nlmon);
struct nlmon *nlmon_create(void);

121
monitor/pcap.c
View File

@ -28,6 +28,7 @@
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/uio.h>
#include <ell/ell.h>
#include "monitor/pcap.h"
@ -53,11 +54,12 @@ struct pcap_pkt {
struct pcap {
int fd;
bool closed;
uint32_t type;
uint32_t snaplen;
};
struct pcap *pcap_open(const char *path)
struct pcap *pcap_open(const char *pathname)
{
struct pcap *pcap;
struct pcap_hdr hdr;
@ -65,7 +67,7 @@ struct pcap *pcap_open(const char *path)
pcap = l_new(struct pcap, 1);
pcap->fd = open(path, O_RDONLY | O_CLOEXEC);
pcap->fd = open(pathname, O_RDONLY | O_CLOEXEC);
if (pcap->fd < 0) {
perror("Failed to open PCAP file");
l_free(pcap);
@ -93,6 +95,7 @@ struct pcap *pcap_open(const char *path)
goto failed;
}
pcap->closed = false;
pcap->snaplen = hdr.snaplen;
pcap->type = hdr.network;
@ -105,6 +108,56 @@ failed:
return NULL;
}
struct pcap *pcap_create(const char *pathname)
{
struct pcap *pcap;
struct pcap_hdr hdr;
ssize_t len;
pcap = l_new(struct pcap, 1);
pcap->fd = open(pathname, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
if (pcap->fd < 0) {
perror("Failed to create PCAP file");
l_free(pcap);
return NULL;
}
pcap->closed = false;
pcap->snaplen = 0x0000ffff;
pcap->type = 0x00000071;
memset(&hdr, 0, sizeof(hdr));
hdr.magic_number = 0xa1b2c3d4;
hdr.version_major = 0x0002;
hdr.version_minor = 0x0004;
hdr.thiszone = 0;
hdr.sigfigs = 0;
hdr.snaplen = pcap->snaplen;
hdr.network = pcap->type;
len = write(pcap->fd, &hdr, PCAP_HDR_SIZE);
if (len < 0) {
perror("Failed to write PCAP header");
goto failed;
}
if (len != PCAP_HDR_SIZE) {
fprintf(stderr, "Written PCAP header size mimatch\n");
goto failed;
}
return pcap;
failed:
close(pcap->fd);
l_free(pcap);
return NULL;
}
void pcap_close(struct pcap *pcap)
{
if (!pcap)
@ -142,21 +195,32 @@ bool pcap_read(struct pcap *pcap, struct timeval *tv,
if (!pcap)
return false;
bytes_read = read(pcap->fd, &pkt, PCAP_PKT_SIZE);
if (bytes_read != PCAP_PKT_SIZE)
if (pcap->closed)
return false;
bytes_read = read(pcap->fd, &pkt, PCAP_PKT_SIZE);
if (bytes_read != PCAP_PKT_SIZE) {
pcap->closed = true;
return false;
}
if (pkt.incl_len > size)
toread = size;
else
toread = pkt.incl_len;
bytes_read = read(pcap->fd, data, toread);
if (bytes_read < 0)
if (bytes_read < 0) {
pcap->closed = true;
return false;
}
if (bytes_read < pkt.incl_len)
lseek(pcap->fd, pkt.incl_len - bytes_read, SEEK_CUR);
if (bytes_read < pkt.incl_len) {
if (lseek(pcap->fd, pkt.incl_len - bytes_read, SEEK_CUR) < 0) {
pcap->closed = true;
return false;
}
}
if (tv) {
tv->tv_sec = pkt.ts_sec;
@ -171,3 +235,46 @@ bool pcap_read(struct pcap *pcap, struct timeval *tv,
return true;
}
bool pcap_write(struct pcap *pcap, const struct timeval *tv,
const void *phdr, uint32_t plen,
const void *data, uint32_t size)
{
struct iovec iov[3];
struct pcap_pkt pkt;
ssize_t written;
if (!pcap)
return false;
if (pcap->closed)
return false;
memset(&pkt, 0, sizeof(pkt));
if (tv) {
pkt.ts_sec = tv->tv_sec;
pkt.ts_usec = tv->tv_usec;
}
pkt.incl_len = plen + size;
pkt.orig_len = plen + size;
iov[0].iov_base = &pkt;
iov[0].iov_len = PCAP_PKT_SIZE;
iov[1].iov_base = (void *) phdr;
iov[1].iov_len = plen;
iov[2].iov_base = (void *) data;
iov[2].iov_len = size;
written = writev(pcap->fd, iov, 3);
if (written < 0) {
pcap->closed = true;
return false;
}
if (written < (ssize_t) (PCAP_PKT_SIZE + plen + size)) {
pcap->closed = true;
return false;
}
return true;
}

7
monitor/pcap.h
View File

@ -30,7 +30,8 @@
struct pcap;
struct pcap *pcap_open(const char *path);
struct pcap *pcap_open(const char *pathname);
struct pcap *pcap_create(const char *pathname);
void pcap_close(struct pcap *pcap);
uint32_t pcap_get_type(struct pcap *pcap);
@ -38,3 +39,7 @@ uint32_t pcap_get_snaplen(struct pcap *pcap);
bool pcap_read(struct pcap *pcap, struct timeval *tv,
void *data, uint32_t size, uint32_t *len, uint32_t *real_len);
bool pcap_write(struct pcap *pcap, const struct timeval *tv,
const void *phdr, uint32_t plen,
const void *data, uint32_t size);