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#include <stdio.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <assert.h>
#include <poll.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include "kdbus-util.h"
#include "kdbus-enum.h"
struct pcap_header {
uint32_t magic;
uint16_t major;
uint16_t minor;
uint32_t tz_offset;
uint32_t ts_accurancy;
uint32_t snapshot_len;
uint32_t header_type;
};
struct pcap_entry {
uint32_t tv_sec;
uint32_t tv_usec;
uint32_t len;
uint32_t total_len;
uint8_t data[0];
};
static void usage(const char *argv0)
{
fprintf(stderr, "Usage: %s <bus-node> <output-file>\n", argv0);
fprintf(stderr, " bus-node The device node to connect to\n");
fprintf(stderr, " output-file The output file to write to\n");
}
static int dump_packet(struct conn *conn, int fd)
{
int ret;
struct kdbus_cmd_recv recv = {};
uint64_t size;
struct kdbus_msg *msg;
const struct kdbus_item *item;
struct timeval now;
struct pcap_entry entry;
uint64_t to_write;
void *data_to_write;
gettimeofday(&now, NULL);
entry.tv_sec = now.tv_sec;
entry.tv_usec = now.tv_usec;
ret = ioctl(conn->fd, KDBUS_CMD_MSG_RECV, &recv);
if (ret < 0) {
fprintf(stderr, "error receiving message: %d (%m)\n", ret);
return EXIT_FAILURE;
}
msg = (struct kdbus_msg *)(conn->buf + recv.offset);
item = msg->items;
size = msg->size;
/* collect length of oob payloads */
KDBUS_ITEM_FOREACH(item, msg, items)
if (item->type == KDBUS_ITEM_PAYLOAD_OFF)
size += KDBUS_ALIGN8(item->vec.size);
entry.len = size;
entry.total_len = size;
size = write(fd, &entry, sizeof(entry));
if (size != sizeof(entry)) {
fprintf(stderr, "Unable to write: %m\n");
return EXIT_FAILURE;
}
size = write(fd, msg, msg->size);
if (size != msg->size) {
fprintf(stderr, "Unable to write: %m\n");
return EXIT_FAILURE;
}
KDBUS_ITEM_FOREACH(item, msg, items) {
switch (item->type) {
/* close all memfds */
case KDBUS_ITEM_PAYLOAD_MEMFD:
close(item->memfd.fd);
break;
case KDBUS_ITEM_PAYLOAD_OFF:
if (item->vec.offset != ~0ULL) {
to_write = KDBUS_ALIGN8(item->vec.size);
data_to_write = (void *) msg + item->vec.offset;
} else {
/*add data padding to file*/
to_write = item->vec.size % 8;
data_to_write = "\0\0\0\0\0\0\0";
}
size = write(fd, data_to_write, to_write);
if (size != to_write) {
fprintf(stderr, "Unable to write: %m\n");
return EXIT_FAILURE;
}
break;
}
}
ret = ioctl(conn->fd, KDBUS_CMD_FREE, &recv.offset);
if (ret < 0) {
fprintf(stderr, "error free message: %d (%m)\n", ret);
return EXIT_FAILURE;
}
return 0;
}
static bool do_exit = false;
static void sig_handler(int foo)
{
do_exit = true;
}
int main(int argc, char **argv)
{
unsigned long long count = 0;
struct sigaction act = {};
struct pcap_header header;
struct conn *conn;
struct pollfd fd;
char *bus, *file;
sigset_t mask;
int output_fd;
int ret;
if (argc < 3) {
usage(argv[0]);
return EXIT_FAILURE;
}
bus = argv[1];
file = argv[2];
output_fd = open(file, O_CREAT | O_WRONLY | O_TRUNC, 0644);
if (output_fd < 0) {
fprintf(stderr, "Unable to open '%s': %m\n", file);
return EXIT_FAILURE;
}
conn = connect_to_bus(bus, KDBUS_HELLO_MONITOR);
if (!conn) {
fprintf(stderr, "Unable to connect as monitor: %m\n");
return EXIT_FAILURE;
}
memset(&header, 0, sizeof(header));
header.magic = 0xa1b2c3d4;
header.major = 2;
header.minor = 4;
header.snapshot_len = 0xffffffff;
header.header_type = 0x12345678; /* FIXME */
ret = write(output_fd, &header, sizeof(header));
if (ret != sizeof(header)) {
fprintf(stderr, "Unable to write to '%s': %m\n", file);
return EXIT_FAILURE;
}
act.sa_handler = sig_handler;
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigprocmask(SIG_UNBLOCK, &mask, NULL);
fprintf(stderr, "Capturing. Press ^C to stop ...\n");
fd.fd = conn->fd;
while (!do_exit) {
fd.events = POLLIN | POLLPRI | POLLHUP;
fd.revents = 0;
ret = poll(&fd, 1, -1);
if (ret < 0)
break;
if (fd.revents & POLLIN) {
ret = dump_packet(conn, output_fd);
if (ret != 0) {
fprintf(stderr, "Unable to dump packet '%s': %m\n", file);
return EXIT_FAILURE;
}
count++;
}
if (fd.revents & (POLLHUP | POLLERR))
do_exit = true;
}
fprintf(stderr, "\n%llu packets received and dumped.\n", count);
fprintf(stderr, "-- closing bus connections\n");
close(output_fd);
close(conn->fd);
free(conn);
return 0;
}
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