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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/time.h>
#include <linux/netlink.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <getopt.h>
#include <ctype.h>
#include <fcntl.h>
#include <poll.h>
#include <errno.h>
enum type_t {
TYPE_SYSFS,
TYPE_NETLINK,
};
int dump(void *_a, size_t s)
{
size_t i, j;
unsigned char *p = _a;
for (i = 0; i < s; i += 16) {
for (j = 0; j < 16; j ++ ) {
if (j == 8)
printf(" - ");
if (i + j > s) {
printf(" ");
} else {
printf("%c", (isprint(p[i+j])) ? p[i+j] : '.');
}
}
printf(" ");
for (j = 0; j < 16; j ++ ) {
if (j == 8)
printf(" - ");
printf("%02X ", p[i+j]);
}
printf("\n");
}
return 0;
}
int sysfs_handle_open(char *name)
{
char sysfs[256] = "/sys/devices/virtual/xt_idletimer/timers/";
char buffer[256];
int r, rd;
strcat(sysfs, name);
r = open(sysfs, O_RDONLY);
if (r < 0)
return r;
rd = read(r, buffer, sizeof(buffer));
return r;
}
#define sysfs_handle_close(h) close(h)
int netlink_socket_open(struct sockaddr_nl *s_nladdr)
{
int fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
bind(fd, (struct sockaddr*)s_nladdr, sizeof(*s_nladdr));
return fd;
}
#define netlink_socket_close(h) close(h)
int do_wait(char *nick, enum type_t type, int seconds)
{
struct pollfd pfd;
int r;
short exp;
struct sockaddr_nl s_nladdr;
static char buffer[256];
char *ptr;
pfd.revents = 0;
if (type == TYPE_SYSFS) {
pfd.fd = sysfs_handle_open(nick);
pfd.events = POLLPRI | POLLERR;
exp = POLLPRI | POLLERR;
}
if (type == TYPE_NETLINK) {
memset(&s_nladdr, 0 ,sizeof(s_nladdr));
s_nladdr.nl_family = AF_NETLINK ;
s_nladdr.nl_pid = getpid();
s_nladdr.nl_groups = 0xffffffff;
pfd.fd = netlink_socket_open(&s_nladdr);
pfd.events = POLLIN;
exp = POLLIN;
}
r = poll(&pfd, 1, seconds * 1000);
if (r <= 0)
return r;
if (type == TYPE_NETLINK) {
struct msghdr msg;
struct iovec iov[2];
struct nlmsghdr nlh;
iov[0].iov_base = (void *)&nlh;
iov[0].iov_len = sizeof(nlh);
iov[1].iov_base = (void *)buffer;
iov[1].iov_len = sizeof(buffer);
msg.msg_name = &s_nladdr;
msg.msg_namelen = sizeof(s_nladdr);
msg.msg_iov = iov;
msg.msg_iovlen = sizeof(iov)/sizeof(iov[0]);
memset(buffer, 0, sizeof(buffer));
r = recvmsg(pfd.fd, &msg, 0);
} else {
lseek(pfd.fd, 0, SEEK_SET);
r = read(pfd.fd, buffer, sizeof(buffer));
}
if (r < 0)
return r;
for (ptr = buffer; ptr - buffer < r; ptr = ptr + strlen(ptr) + 1) {
if (strlen(ptr) == 0)
continue;
printf("%s\n", ptr);
}
return 1;
}
int main(int argc, char *argv[])
{
int c, r, opti;
int timeout_sec = 10;
struct option lopt[] = {
{ "timeout", required_argument, NULL, 't' },
{ "sysfs", required_argument, NULL, 's' },
{ "netlink", no_argument, NULL, 'n' },
{ NULL, 0, NULL, 0 },
};
char *shopt = "ts:n";
char *nick = NULL;
enum type_t type;
while ((c = getopt_long(argc, argv, shopt, lopt, &opti)) != -1 ) {
switch (c) {
case 't':
timeout_sec = atoi(optarg);
break;
case 's':
case 'n':
if (!nick) {
if (optarg) {
nick = strdup(optarg);
} else {
nick = (char*)0xffffffff;
}
type = (c == 's' ? TYPE_SYSFS : TYPE_NETLINK);
} else {
printf("sysfs and netlink could not be used at the same time\n");
exit(1);
}
break;
default:
printf("Hmmm, c = 0x%x (%c)\n", c, isprint(c) ? c : '*');
break;
}
}
if (!nick) {
printf("Sorry, you have to provide one of --sysfs=ARG or --netlink\n");
return EINVAL;
}
r = do_wait(nick, type, timeout_sec);
if (r < 0) {
perror("do_wait");
return r;
}
else if (r == 0) {
printf("No data within %d seconds\n", timeout_sec);
return 1;
}
printf("OK\n");
return 0;
}
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