AnyEvent-FastPing/FastPing.xs

#if defined(__linux) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__CYGWIN__)
# define ENABLE_IPV6 1 // if you get compilation problems try to disable IPv6
#else
# define ENABLE_IPV6 0
#endif

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <pthread.h>

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <time.h>
#include <poll.h>
#include <unistd.h>
#include <inttypes.h>
#include <fcntl.h>
#include <errno.h>

#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <arpa/inet.h>

#ifdef __linux
# include <linux/icmp.h>
#endif
#if ENABLE_IPV6 && !defined (__CYGWIN__)
# include <netinet/icmp6.h>
#endif

#define ICMP4_ECHO       8
#define ICMP4_ECHO_REPLY 0
#define ICMP6_ECHO       128
#define ICMP6_ECHO_REPLY 129

#define DRAIN_INTERVAL .000001 // how long to wait when sendto returns ENOBUFS, in seconds
#define MIN_INTERVAL   .000001 // minimum packet send interval, in seconds

#define HDR_SIZE_IP4  20
#define HDR_SIZE_IP6  48

//TODO: xread/xwrite for atomicity? we currently rely on the fact that the pip buffersize divides exactly by pointer sizes

typedef uint8_t addr_tt[16];

typedef double tstamp;

static tstamp
NOW (void)
{
  struct timeval tv;
  gettimeofday (&tv, 0);
  return tv.tv_sec + tv.tv_usec * 0.000001;
}

typedef struct
{
  int family;
  addr_tt lo, hi;
  double interval;
  tstamp next;
} RANGE;

typedef struct
{
  SV *id;
  double interval;
  int nranges;
  RANGE *ranges;
  uint32_t payload;
} REQ;

typedef struct
{
  uint8_t version_ihl;
  uint8_t tos;
  uint16_t tot_len;

  uint16_t id;
  uint16_t flags;

  uint8_t ttl;
  uint8_t protocol;
  uint16_t cksum;

  uint32_t src;
  uint32_t dst;
} IP4HDR;

typedef struct
{
  uint8_t version;
  uint8_t x1, x2, x3;

  uint16_t payload_len;
  uint8_t nxt_hdr;
  uint8_t hop_limit;

  uint8_t src[16];
  uint8_t dst[16];
} IP6HDR;

#define MAGIC 0xca4c

static uint16_t magic;

typedef struct
{
  uint8_t type, code;
  uint16_t cksum;
  uint16_t id, seq;
  uint32_t payload;
  tstamp stamp; // be careful when accessing this
} PKT;

static pthread_t pthrid;
static int thr_send[2]; // send to worker
static int thr_recv[2]; // receive from worker

static int icmp4_fd, icmp6_fd;

static AV *cbs;

static uint16_t
icmp_cksum (void *data, unsigned int len)
{
  register int sum = 0;
  uint16_t *wp;

  assert (~len & 1);

  for (wp = (uint16_t *)data; len; wp++, len -= 2)
    sum += *wp;

  sum = (sum >> 16) + (sum & 0xffff);   /* add high 16 to low 16 */
  sum += sum >> 16;                     /* add carry */

  return ~sum;
}

static void
inc_addr (addr_tt *addr)
{
  int len = sizeof (addr_tt) - 1;

  do
    {
      if ((*addr)[len] != 0xff)
        {
          ++(*addr)[len];
          break;
        }

      (*addr)[len] = 0;
    }
  while (len--);
}

static void *
ping_proc (void *unused)
{
  PKT pkt;
  struct sockaddr_in sa4;
#if ENABLE_IPV6
  struct sockaddr_in6 sa6;
#endif

  memset (&pkt, 0, sizeof (pkt));

  memset (&sa4, 0, sizeof (sa4));
  sa4.sin_family  = AF_INET;
  sa4.sin_port    = 0;
#if ENABLE_IPV6
  memset (&sa6, 0, sizeof (sa6));
  sa6.sin6_family = AF_INET6;
  sa6.sin6_port   = 0;
#endif

  for (;;)
    {
      REQ *req;
      int len = read (thr_send [0], &req, sizeof (req));

      tstamp now = NOW ();
      tstamp next = now;

      if (!len)
        pthread_exit (0);
      else if (len != sizeof (req))
        {
          perror ("AnyEvent::FastPing: short read or read error");
          pthread_exit ((void *)-1);
        }

      //TODO: bind to source address

      pkt.code    = 0;
      pkt.id      = (uint16_t)magic;
      pkt.seq     = (uint16_t)~magic;
      pkt.payload = req->payload;

      {
        int r;
        for (r = req->nranges; r--; )
          inc_addr (&req->ranges [r].hi);
      }

      while (req->nranges)
        {
          RANGE *range = req->ranges;
          int n, k;

          if (!memcmp (&range->lo, &range->hi, sizeof (addr_tt)))
            req->ranges [0] = req->ranges [--req->nranges];
          else
            {
              // ranges [0] is always the next range to ping
              tstamp wait = range->next - now;

              // compare with the global frequency limit
              {
                tstamp diff = next - now;

                if (wait < diff)
                  wait = diff;
                else if (range)
                  next = range->next;
              }

              if (wait > 0.)
                {
                  struct timespec ts;

                  ts.tv_sec  = wait;
                  ts.tv_nsec = (wait - ts.tv_sec) * 1000000000.;

                  nanosleep (&ts, 0);
                }

              now = NOW ();

              pkt.stamp = now;
              pkt.cksum = 0;

              if (range->family == AF_INET)
                {
                  pkt.type  = ICMP4_ECHO;
                  pkt.cksum = icmp_cksum (&pkt, sizeof (pkt));

                  memcpy (&sa4.sin_addr,
                          sizeof (addr_tt) - sizeof (sa4.sin_addr) + (char *)&range->lo,
                          sizeof (sa4.sin_addr));

                  if (sendto (icmp4_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa4, sizeof (sa4)) > 0)
                    errno = 0;
                }
              else
                {
#if ENABLE_IPV6
                  pkt.type = ICMP6_ECHO;

                  memcpy (&sa6.sin6_addr,
                          sizeof (addr_tt) - sizeof (sa6.sin6_addr) + (char *)&range->lo,
                          sizeof (sa6.sin6_addr));

                  if (sendto (icmp6_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa6, sizeof (sa6)) > 0)
                    errno = 0;
#endif
                }

              if (errno == ENOBUFS)
                {
                  struct timespec ts;

                  ts.tv_sec  = 0;
                  ts.tv_nsec = DRAIN_INTERVAL * 1000000000;

                  nanosleep (&ts, 0);
                }
              else
                {
                  inc_addr (&range->lo);

                  range->next = next;
                  range->next += range->interval;
                }

              next += req->interval;
            }

          // make a downheap operation
          for (n = k = 0; ; )
            {
              int j = k * 2 + 1;

              ++n;

              if (j >= req->nranges)
                break;
              else if (j < req->nranges - 1)
                if (req->ranges [j].next > req->ranges [j + 1].next)
                  ++j;

              if (req->ranges [j].next >= req->ranges [k].next)
                break;

              {
                RANGE temp = req->ranges [k];
                req->ranges [k] = req->ranges [j];
                req->ranges [j] = temp;
              }

              k = j;
            }
        }

      write (thr_recv [1], &req, sizeof (req));
    }

  return 0;
}

static void
feed_reply (AV *res_av)
{
  dSP;
  SV *res = sv_2mortal (newRV_inc ((SV *)res_av));
  int i;

  if (av_len (res_av) < 0)
    return;

  ENTER;
  SAVETMPS;

  for (i = av_len (cbs) + 1; i--; )
    {
      SV *cb = *av_fetch (cbs, i, 1);

      PUSHMARK (SP);
      XPUSHs (res);
      PUTBACK;
      call_sv (cb, G_DISCARD | G_VOID);
    }

  FREETMPS;
  LEAVE;
}

static void
boot ()
{
  sigset_t fullsigset, oldsigset;
  pthread_attr_t attr;

  if (pipe (thr_send) < 0)
    croak ("AnyEvent::FastPing: unable to create send pipe");

  if (pipe (thr_recv) < 0)
    croak ("AnyEvent::FastPing: unable to create receive pipe");

  icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
  fcntl (icmp4_fd, F_SETFL, O_NONBLOCK);
#ifdef ICMP_FILTER
  {
    struct icmp_filter oval;
    oval.data = 0xffffffff & ~(1 << ICMP4_ECHO_REPLY);
    setsockopt (icmp4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
  }
#endif

#if ENABLE_IPV6
  icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
  fcntl (icmp6_fd, F_SETFL, O_NONBLOCK);
# ifdef ICMP6_FILTER
  {
    struct icmp6_filter oval;
    ICMP6_FILTER_SETBLOCKALL (&oval);
    ICMP6_FILTER_SETPASS (ICMP6_ECHO_REPLY, &oval);
    setsockopt (icmp6_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &oval, sizeof oval);
  }
# endif
#endif

  pthread_attr_init (&attr);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
#ifdef PTHREAD_SCOPE_PROCESS
  pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
#endif

  sigfillset (&fullsigset);

  pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);

  if (pthread_create (&pthrid, &attr, ping_proc, 0))
    croak ("AnyEvent::FastPing: unable to create pinger thread");

  pthread_sigmask (SIG_SETMASK, &oldsigset, 0);

  sv_setiv (get_sv ("AnyEvent::FastPing::THR_REQ_FD", 1), thr_send [1]);
  sv_setiv (get_sv ("AnyEvent::FastPing::THR_RES_FD", 1), thr_recv [0]);

  sv_setiv (get_sv ("AnyEvent::FastPing::ICMP4_FD", 1), icmp4_fd);
  sv_setiv (get_sv ("AnyEvent::FastPing::ICMP6_FD", 1), icmp6_fd);
}

MODULE = AnyEvent::FastPing             PACKAGE = AnyEvent::FastPing

BOOT:
{
  HV *stash = gv_stashpv ("AnyEvent::FastPing", 1);

  cbs = get_av ("AnyEvent::FastPing::CB", 1);
  magic = getpid () ^ MAGIC;

  boot ();

  newCONSTSUB (stash, "ipv4_supported", newSViv (icmp4_fd >= 0));
  newCONSTSUB (stash, "ipv6_supported", newSViv (icmp6_fd >= 0));

  newCONSTSUB (stash, "icmp4_pktsize", newSViv (HDR_SIZE_IP4 + sizeof (PKT)));
  newCONSTSUB (stash, "icmp6_pktsize", newSViv (HDR_SIZE_IP6 + sizeof (PKT)));
}

PROTOTYPES: DISABLE

SV *
_req_icmp_ping (SV *ranges, NV interval, U32 payload, SV *id)
        CODE:
{
        AV *rav;
        int nranges, i;
        REQ *req;

        if (!SvROK (ranges) || SvTYPE (SvRV (ranges)) != SVt_PVAV)
          croak ("address ranges must be given as arrayref with lo, hi pairs");

        rav = (AV *)SvRV (ranges);
        nranges = av_len (rav) + 1;

        req = malloc (sizeof (REQ));

        if (interval < MIN_INTERVAL)
          interval = MIN_INTERVAL;

        req->id       = newSVsv (id);
        req->interval = interval;
        req->payload  = payload;
        req->nranges  = nranges;
        req->ranges   = (RANGE *)malloc (nranges * sizeof (RANGE));

        while (nranges--)
          {
            SV *sv = *av_fetch (rav, nranges, 1);
            SV *lo, *hi;
            AV *av;
            RANGE *r;

            if (!SvROK (sv) || SvTYPE (SvRV (sv)) != SVt_PVAV)
              croak ("address range must be given as arrayref with lo, hi, interval arrayrefs");

            av = (AV *)SvRV (sv);
            r = req->ranges + nranges;

            lo = *av_fetch (av, 0, 1);
            hi = *av_fetch (av, 1, 1);

            sv_utf8_downgrade (lo, 0);
            sv_utf8_downgrade (hi, 0);

            memset (&r->lo, 0, sizeof (addr_tt));
            memset (&r->hi, 0, sizeof (addr_tt));

            if (SvPOKp (lo) && SvPOKp (hi))
              {
                if (SvCUR (lo) != SvCUR (hi))
                  croak ("all addresses in range must be of the same size (either 4 or 16 bytes)");

                if (SvCUR (lo) == 4)
                  {
                    r->family = AF_INET;
                    memcpy (sizeof (addr_tt) - 4 + (char *)&r->lo, SvPVX (lo), 4);
                    memcpy (sizeof (addr_tt) - 4 + (char *)&r->hi, SvPVX (hi), 4);
                  }
                else if (SvCUR (lo) == 16)
                  {
#if ENABLE_IPV6
                    r->family = AF_INET6;
                    memcpy (&r->lo, SvPVX (lo), sizeof (addr_tt));
                    memcpy (&r->hi, SvPVX (hi), sizeof (addr_tt));
#else
                    croak ("IPv6 not supported in this configuration");
#endif
                  }
                else
                  croak ("addresses in range must be either 4 (IPv4) or 16 (IPv6) bytes in length");
              }
            else if (SvIOK (lo) && SvIOK (hi))
              {
                uint32_t addr;

                r->family = AF_INET;

                addr = htonl (SvUV (lo)); memcpy (sizeof (addr_tt) - 4 + (char *)&r->lo, &addr, 4);
                addr = htonl (SvUV (hi)); memcpy (sizeof (addr_tt) - 4 + (char *)&r->hi, &addr, 4);
              }
            else
              croak ("addresses in range must be strings with either 4 (IPv4) or 16 (IPv6) octets");

            if (r->family == AF_INET)
              {
                if (icmp4_fd < 0)
                  croak ("AnyEvent::FastPing: IPv4 ping support not available on this system");
              }
            else
              {
                if (icmp6_fd < 0)
                  croak ("AnyEvent::FastPing: IPv6 ping support not available on this system");
              }

            r->interval = SvNV (*av_fetch (av, 2, 1));

            if (r->interval < req->interval)
              r->interval = req->interval;

            r->next = 0.;
          }

        RETVAL = newSVpvn ((char *)&req, sizeof (req));
}
        OUTPUT:
        RETVAL

SV *
_read_res ()
        CODE:
{
        REQ *req;

        if (read (thr_recv [0], &req, sizeof (req)) != sizeof (req))
          RETVAL = &PL_sv_undef;

        RETVAL = req->id;
        free (req->ranges);
        free (req);
}
        OUTPUT:
        RETVAL

void
_recv_icmp4 (...)
        CODE:
{
        char buf [512];
        struct sockaddr_in sa;
        socklen_t sl = sizeof (sa);
        AV *res_av = av_len (cbs) < 0 ? 0 : (AV *)sv_2mortal ((SV *)newAV ());
        tstamp now = NOW ();

        for (;;)
          {
            IP4HDR *iphdr = (IP4HDR *)buf;
            int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_TRUNC, (struct sockaddr *)&sa, &sl);
            int hdrlen, totlen;
            PKT *pkt;

            if (len <= HDR_SIZE_IP4)
              break;

            hdrlen = (iphdr->version_ihl & 15) * 4;
            totlen = ntohs (iphdr->tot_len);

            // packet corrupt?
            if (!res_av
                || totlen > len
                || iphdr->protocol != IPPROTO_ICMP
                || hdrlen < HDR_SIZE_IP4 || hdrlen + sizeof (PKT) != totlen)
              continue;

            pkt = (PKT *)(buf + hdrlen);

            if (pkt->type != ICMP4_ECHO_REPLY
                || pkt->id  != (uint16_t) magic
                || pkt->seq != (uint16_t)~magic
                || !isnormal (pkt->stamp))
              continue;

            {
              AV *av = newAV ();
              av_push (av, newSVpvn ((char *)&sa.sin_addr, 4));
              av_push (av, newSVnv (now - pkt->stamp));
              av_push (av, newSVuv (pkt->payload));

              av_push (res_av, newRV_noinc ((SV *)av));
            }
          }

        if (res_av)
          feed_reply (res_av);
}

void
_recv_icmp6 (...)
        CODE:
{
        struct sockaddr_in6 sa;
        socklen_t sl = sizeof (sa);
        AV *res_av = av_len (cbs) < 0 ? 0 : (AV *)sv_2mortal ((SV *)newAV ());
        PKT pkt;
        tstamp now = NOW ();

        for (;;)
          {
            int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_TRUNC, (struct sockaddr *)&sa, &sl);

            if (len != sizeof (PKT))
              break;

            if (!res_av
                || pkt.type != ICMP6_ECHO_REPLY
                || pkt.id  != (uint16_t) magic
                || pkt.seq != (uint16_t)~magic
                || !isnormal (pkt.stamp))
              continue;

            {
              AV *av = newAV ();
              av_push (av, newSVpvn ((char *)&sa.sin6_addr, 16));
              av_push (av, newSVnv (now - pkt.stamp));
              av_push (av, newSVuv (pkt.payload));

              av_push (res_av, newRV_noinc ((SV *)av));
            }
          }

        if (res_av)
          feed_reply (res_av);
}

Revision:	1.8
Committed:	Sat Jan 29 23:36:49 2011 UTC (13 years, 3 months ago) by root
Branch:	MAIN
CVS Tags:	rel-1_15, rel-1_14
Changes since 1.7:	+27 -22 lines
Log Message:	1.14
#	User	Rev	Content
1	root	1.8	#if defined(__linux) \|\| defined(__FreeBSD__) \|\| defined(__OpenBSD__) \|\| defined(__NetBSD__) \|\| defined(__CYGWIN__)
2	root	1.5	# define ENABLE_IPV6 1 // if you get compilation problems try to disable IPv6
3	root	1.2	#else
4	root	1.5	# define ENABLE_IPV6 0
5	root	1.2	#endif
6	root	1.1
7			#include "EXTERN.h"
8			#include "perl.h"
9			#include "XSUB.h"
10
11			#include <pthread.h>
12
13			#include <math.h>
14			#include <stdio.h>
15			#include <stdlib.h>
16			#include <string.h>
17
18			#include <time.h>
19			#include <poll.h>
20			#include <unistd.h>
21			#include <inttypes.h>
22			#include <fcntl.h>
23			#include <errno.h>
24
25			#include <sys/types.h>
26			#include <sys/time.h>
27			#include <sys/socket.h>
28
29			#include <netinet/in.h>
30			#include <arpa/inet.h>
31
32			#ifdef __linux
33			# include <linux/icmp.h>
34			#endif
35	root	1.8	#if ENABLE_IPV6 && !defined (__CYGWIN__)
36	root	1.1	# include <netinet/icmp6.h>
37			#endif
38
39			#define ICMP4_ECHO 8
40			#define ICMP4_ECHO_REPLY 0
41			#define ICMP6_ECHO 128
42			#define ICMP6_ECHO_REPLY 129
43
44			#define DRAIN_INTERVAL .000001 // how long to wait when sendto returns ENOBUFS, in seconds
45			#define MIN_INTERVAL .000001 // minimum packet send interval, in seconds
46
47			#define HDR_SIZE_IP4 20
48			#define HDR_SIZE_IP6 48
49
50	root	1.4	//TODO: xread/xwrite for atomicity? we currently rely on the fact that the pip buffersize divides exactly by pointer sizes
51	root	1.1
52	root	1.8	typedef uint8_t addr_tt[16];
53	root	1.1
54			typedef double tstamp;
55
56	root	1.5	static tstamp
57			NOW (void)
58	root	1.1	{
59			struct timeval tv;
60			gettimeofday (&tv, 0);
61			return tv.tv_sec + tv.tv_usec * 0.000001;
62			}
63
64	root	1.8	typedef struct
65			{
66	root	1.1	int family;
67	root	1.8	addr_tt lo, hi;
68	root	1.1	double interval;
69			tstamp next;
70			} RANGE;
71
72	root	1.8	typedef struct
73			{
74	root	1.1	SV *id;
75			double interval;
76			int nranges;
77			RANGE *ranges;
78			uint32_t payload;
79			} REQ;
80
81	root	1.8	typedef struct
82			{
83	root	1.1	uint8_t version_ihl;
84			uint8_t tos;
85			uint16_t tot_len;
86
87			uint16_t id;
88			uint16_t flags;
89
90			uint8_t ttl;
91			uint8_t protocol;
92			uint16_t cksum;
93
94			uint32_t src;
95			uint32_t dst;
96			} IP4HDR;
97
98	root	1.8	typedef struct
99			{
100	root	1.1	uint8_t version;
101			uint8_t x1, x2, x3;
102
103			uint16_t payload_len;
104			uint8_t nxt_hdr;
105			uint8_t hop_limit;
106
107			uint8_t src[16];
108			uint8_t dst[16];
109			} IP6HDR;
110
111			#define MAGIC 0xca4c
112
113			static uint16_t magic;
114
115	root	1.8	typedef struct
116			{
117	root	1.1	uint8_t type, code;
118			uint16_t cksum;
119			uint16_t id, seq;
120			uint32_t payload;
121			tstamp stamp; // be careful when accessing this
122			} PKT;
123
124			static pthread_t pthrid;
125			static int thr_send[2]; // send to worker
126			static int thr_recv[2]; // receive from worker
127
128			static int icmp4_fd, icmp6_fd;
129
130			static AV *cbs;
131
132			static uint16_t
133			icmp_cksum (void *data, unsigned int len)
134			{
135			register int sum = 0;
136			uint16_t *wp;
137
138			assert (~len & 1);
139
140			for (wp = (uint16_t *)data; len; wp++, len -= 2)
141			sum += *wp;
142
143			sum = (sum >> 16) + (sum & 0xffff); /* add high 16 to low 16 */
144			sum += sum >> 16; /* add carry */
145
146			return ~sum;
147			}
148
149			static void
150	root	1.8	inc_addr (addr_tt *addr)
151	root	1.1	{
152	root	1.8	int len = sizeof (addr_tt) - 1;
153	root	1.1
154			do
155			{
156			if ((*addr)[len] != 0xff)
157			{
158			++(*addr)[len];
159			break;
160			}
161
162			(*addr)[len] = 0;
163			}
164			while (len--);
165			}
166
167			static void *
168			ping_proc (void *unused)
169			{
170			PKT pkt;
171			struct sockaddr_in sa4;
172	root	1.5	#if ENABLE_IPV6
173	root	1.1	struct sockaddr_in6 sa6;
174			#endif
175
176			memset (&pkt, 0, sizeof (pkt));
177
178			memset (&sa4, 0, sizeof (sa4));
179			sa4.sin_family = AF_INET;
180			sa4.sin_port = 0;
181	root	1.5	#if ENABLE_IPV6
182	root	1.1	memset (&sa6, 0, sizeof (sa6));
183			sa6.sin6_family = AF_INET6;
184			sa6.sin6_port = 0;
185			#endif
186
187			for (;;)
188			{
189			REQ *req;
190			int len = read (thr_send [0], &req, sizeof (req));
191
192	root	1.6	tstamp now = NOW ();
193			tstamp next = now;
194
195	root	1.1	if (!len)
196			pthread_exit (0);
197			else if (len != sizeof (req))
198			{
199	root	1.7	perror ("AnyEvent::FastPing: short read or read error");
200	root	1.1	pthread_exit ((void *)-1);
201			}
202
203			//TODO: bind to source address
204
205			pkt.code = 0;
206			pkt.id = (uint16_t)magic;
207			pkt.seq = (uint16_t)~magic;
208			pkt.payload = req->payload;
209
210			{
211			int r;
212			for (r = req->nranges; r--; )
213			inc_addr (&req->ranges [r].hi);
214			}
215
216			while (req->nranges)
217			{
218			RANGE *range = req->ranges;
219	root	1.6	int n, k;
220	root	1.1
221	root	1.8	if (!memcmp (&range->lo, &range->hi, sizeof (addr_tt)))
222	root	1.1	req->ranges [0] = req->ranges [--req->nranges];
223			else
224			{
225			// ranges [0] is always the next range to ping
226			tstamp wait = range->next - now;
227
228			// compare with the global frequency limit
229			{
230			tstamp diff = next - now;
231
232			if (wait < diff)
233			wait = diff;
234			else if (range)
235			next = range->next;
236			}
237
238			if (wait > 0.)
239			{
240			struct timespec ts;
241
242			ts.tv_sec = wait;
243			ts.tv_nsec = (wait - ts.tv_sec) * 1000000000.;
244
245			nanosleep (&ts, 0);
246			}
247
248			now = NOW ();
249
250			pkt.stamp = now;
251			pkt.cksum = 0;
252
253			if (range->family == AF_INET)
254			{
255			pkt.type = ICMP4_ECHO;
256			pkt.cksum = icmp_cksum (&pkt, sizeof (pkt));
257
258			memcpy (&sa4.sin_addr,
259	root	1.8	sizeof (addr_tt) - sizeof (sa4.sin_addr) + (char *)&range->lo,
260	root	1.1	sizeof (sa4.sin_addr));
261
262			if (sendto (icmp4_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa4, sizeof (sa4)) > 0)
263			errno = 0;
264			}
265			else
266			{
267	root	1.5	#if ENABLE_IPV6
268	root	1.1	pkt.type = ICMP6_ECHO;
269
270			memcpy (&sa6.sin6_addr,
271	root	1.8	sizeof (addr_tt) - sizeof (sa6.sin6_addr) + (char *)&range->lo,
272	root	1.1	sizeof (sa6.sin6_addr));
273
274			if (sendto (icmp6_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa6, sizeof (sa6)) > 0)
275			errno = 0;
276			#endif
277			}
278
279			if (errno == ENOBUFS)
280			{
281			struct timespec ts;
282
283			ts.tv_sec = 0;
284			ts.tv_nsec = DRAIN_INTERVAL * 1000000000;
285
286			nanosleep (&ts, 0);
287			}
288			else
289			{
290			inc_addr (&range->lo);
291
292			range->next = next;
293			range->next += range->interval;
294			}
295
296			next += req->interval;
297			}
298
299			// make a downheap operation
300	root	1.6	for (n = k = 0; ; )
301	root	1.1	{
302	root	1.6	int j = k * 2 + 1;
303
304	root	1.1	++n;
305
306			if (j >= req->nranges)
307			break;
308			else if (j < req->nranges - 1)
309			if (req->ranges [j].next > req->ranges [j + 1].next)
310			++j;
311
312			if (req->ranges [j].next >= req->ranges [k].next)
313			break;
314
315	root	1.6	{
316			RANGE temp = req->ranges [k];
317			req->ranges [k] = req->ranges [j];
318			req->ranges [j] = temp;
319			}
320	root	1.1
321			k = j;
322			}
323			}
324
325			write (thr_recv [1], &req, sizeof (req));
326			}
327
328			return 0;
329			}
330
331			static void
332			feed_reply (AV *res_av)
333			{
334			dSP;
335			SV res = sv_2mortal (newRV_inc ((SV )res_av));
336			int i;
337
338	root	1.6	if (av_len (res_av) < 0)
339			return;
340
341	root	1.1	ENTER;
342			SAVETMPS;
343
344			for (i = av_len (cbs) + 1; i--; )
345			{
346			SV cb = av_fetch (cbs, i, 1);
347
348			PUSHMARK (SP);
349			XPUSHs (res);
350			PUTBACK;
351			call_sv (cb, G_DISCARD \| G_VOID);
352			}
353
354			FREETMPS;
355			LEAVE;
356			}
357
358			static void
359			boot ()
360			{
361			sigset_t fullsigset, oldsigset;
362			pthread_attr_t attr;
363
364			if (pipe (thr_send) < 0)
365			croak ("AnyEvent::FastPing: unable to create send pipe");
366
367			if (pipe (thr_recv) < 0)
368			croak ("AnyEvent::FastPing: unable to create receive pipe");
369
370			icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
371	root	1.2	fcntl (icmp4_fd, F_SETFL, O_NONBLOCK);
372	root	1.1	#ifdef ICMP_FILTER
373			{
374			struct icmp_filter oval;
375			oval.data = 0xffffffff & ~(1 << ICMP4_ECHO_REPLY);
376			setsockopt (icmp4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
377			}
378			#endif
379
380	root	1.5	#if ENABLE_IPV6
381	root	1.1	icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
382	root	1.2	fcntl (icmp6_fd, F_SETFL, O_NONBLOCK);
383	root	1.1	# ifdef ICMP6_FILTER
384			{
385			struct icmp6_filter oval;
386			ICMP6_FILTER_SETBLOCKALL (&oval);
387			ICMP6_FILTER_SETPASS (ICMP6_ECHO_REPLY, &oval);
388			setsockopt (icmp6_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &oval, sizeof oval);
389			}
390			# endif
391			#endif
392
393			pthread_attr_init (&attr);
394			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
395			#ifdef PTHREAD_SCOPE_PROCESS
396			pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
397			#endif
398
399			sigfillset (&fullsigset);
400
401			pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
402
403			if (pthread_create (&pthrid, &attr, ping_proc, 0))
404			croak ("AnyEvent::FastPing: unable to create pinger thread");
405
406			pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
407
408			sv_setiv (get_sv ("AnyEvent::FastPing::THR_REQ_FD", 1), thr_send [1]);
409			sv_setiv (get_sv ("AnyEvent::FastPing::THR_RES_FD", 1), thr_recv [0]);
410
411			sv_setiv (get_sv ("AnyEvent::FastPing::ICMP4_FD", 1), icmp4_fd);
412			sv_setiv (get_sv ("AnyEvent::FastPing::ICMP6_FD", 1), icmp6_fd);
413			}
414
415			MODULE = AnyEvent::FastPing PACKAGE = AnyEvent::FastPing
416
417			BOOT:
418			{
419			HV *stash = gv_stashpv ("AnyEvent::FastPing", 1);
420
421			cbs = get_av ("AnyEvent::FastPing::CB", 1);
422			magic = getpid () ^ MAGIC;
423
424			boot ();
425
426			newCONSTSUB (stash, "ipv4_supported", newSViv (icmp4_fd >= 0));
427			newCONSTSUB (stash, "ipv6_supported", newSViv (icmp6_fd >= 0));
428
429			newCONSTSUB (stash, "icmp4_pktsize", newSViv (HDR_SIZE_IP4 + sizeof (PKT)));
430			newCONSTSUB (stash, "icmp6_pktsize", newSViv (HDR_SIZE_IP6 + sizeof (PKT)));
431			}
432
433			PROTOTYPES: DISABLE
434
435			SV *
436			_req_icmp_ping (SV ranges, NV interval, U32 payload, SV id)
437			CODE:
438			{
439	root	1.6	AV *rav;
440			int nranges, i;
441			REQ *req;
442
443	root	1.1	if (!SvROK (ranges) \|\| SvTYPE (SvRV (ranges)) != SVt_PVAV)
444			croak ("address ranges must be given as arrayref with lo, hi pairs");
445
446	root	1.6	rav = (AV *)SvRV (ranges);
447			nranges = av_len (rav) + 1;
448	root	1.1
449	root	1.6	req = malloc (sizeof (REQ));
450	root	1.1
451			if (interval < MIN_INTERVAL)
452			interval = MIN_INTERVAL;
453
454			req->id = newSVsv (id);
455			req->interval = interval;
456			req->payload = payload;
457			req->nranges = nranges;
458			req->ranges = (RANGE )malloc (nranges sizeof (RANGE));
459
460			while (nranges--)
461			{
462			SV sv = av_fetch (rav, nranges, 1);
463	root	1.6	SV lo, hi;
464			AV *av;
465			RANGE *r;
466	root	1.1
467			if (!SvROK (sv) \|\| SvTYPE (SvRV (sv)) != SVt_PVAV)
468			croak ("address range must be given as arrayref with lo, hi, interval arrayrefs");
469
470	root	1.6	av = (AV *)SvRV (sv);
471			r = req->ranges + nranges;
472	root	1.1
473	root	1.6	lo = *av_fetch (av, 0, 1);
474			hi = *av_fetch (av, 1, 1);
475	root	1.1
476			sv_utf8_downgrade (lo, 0);
477			sv_utf8_downgrade (hi, 0);
478
479	root	1.8	memset (&r->lo, 0, sizeof (addr_tt));
480			memset (&r->hi, 0, sizeof (addr_tt));
481	root	1.1
482			if (SvPOKp (lo) && SvPOKp (hi))
483			{
484			if (SvCUR (lo) != SvCUR (hi))
485	root	1.5	croak ("all addresses in range must be of the same size (either 4 or 16 bytes)");
486	root	1.1
487			if (SvCUR (lo) == 4)
488			{
489			r->family = AF_INET;
490	root	1.8	memcpy (sizeof (addr_tt) - 4 + (char *)&r->lo, SvPVX (lo), 4);
491			memcpy (sizeof (addr_tt) - 4 + (char *)&r->hi, SvPVX (hi), 4);
492	root	1.1	}
493			else if (SvCUR (lo) == 16)
494			{
495	root	1.5	#if ENABLE_IPV6
496	root	1.1	r->family = AF_INET6;
497	root	1.8	memcpy (&r->lo, SvPVX (lo), sizeof (addr_tt));
498			memcpy (&r->hi, SvPVX (hi), sizeof (addr_tt));
499	root	1.1	#else
500			croak ("IPv6 not supported in this configuration");
501			#endif
502			}
503			else
504	root	1.5	croak ("addresses in range must be either 4 (IPv4) or 16 (IPv6) bytes in length");
505	root	1.1	}
506			else if (SvIOK (lo) && SvIOK (hi))
507			{
508	root	1.6	uint32_t addr;
509
510	root	1.1	r->family = AF_INET;
511
512	root	1.8	addr = htonl (SvUV (lo)); memcpy (sizeof (addr_tt) - 4 + (char *)&r->lo, &addr, 4);
513			addr = htonl (SvUV (hi)); memcpy (sizeof (addr_tt) - 4 + (char *)&r->hi, &addr, 4);
514	root	1.1	}
515			else
516			croak ("addresses in range must be strings with either 4 (IPv4) or 16 (IPv6) octets");
517
518			if (r->family == AF_INET)
519			{
520			if (icmp4_fd < 0)
521			croak ("AnyEvent::FastPing: IPv4 ping support not available on this system");
522			}
523			else
524			{
525			if (icmp6_fd < 0)
526			croak ("AnyEvent::FastPing: IPv6 ping support not available on this system");
527			}
528
529			r->interval = SvNV (*av_fetch (av, 2, 1));
530
531			if (r->interval < req->interval)
532			r->interval = req->interval;
533
534			r->next = 0.;
535			}
536
537			RETVAL = newSVpvn ((char *)&req, sizeof (req));
538			}
539			OUTPUT:
540			RETVAL
541
542			SV *
543			_read_res ()
544			CODE:
545			{
546			REQ *req;
547
548			if (read (thr_recv [0], &req, sizeof (req)) != sizeof (req))
549			RETVAL = &PL_sv_undef;
550
551			RETVAL = req->id;
552			free (req->ranges);
553			free (req);
554			}
555			OUTPUT:
556			RETVAL
557
558			void
559			_recv_icmp4 (...)
560			CODE:
561			{
562			char buf [512];
563			struct sockaddr_in sa;
564			socklen_t sl = sizeof (sa);
565			AV res_av = av_len (cbs) < 0 ? 0 : (AV )sv_2mortal ((SV *)newAV ());
566			tstamp now = NOW ();
567
568			for (;;)
569			{
570	root	1.6	IP4HDR iphdr = (IP4HDR )buf;
571	root	1.2	int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_TRUNC, (struct sockaddr *)&sa, &sl);
572	root	1.6	int hdrlen, totlen;
573			PKT *pkt;
574	root	1.1
575			if (len <= HDR_SIZE_IP4)
576			break;
577
578	root	1.6	hdrlen = (iphdr->version_ihl & 15) * 4;
579			totlen = ntohs (iphdr->tot_len);
580	root	1.1
581			// packet corrupt?
582			if (!res_av
583			\|\| totlen > len
584			\|\| iphdr->protocol != IPPROTO_ICMP
585			\|\| hdrlen < HDR_SIZE_IP4 \|\| hdrlen + sizeof (PKT) != totlen)
586			continue;
587
588	root	1.6	pkt = (PKT *)(buf + hdrlen);
589	root	1.1
590			if (pkt->type != ICMP4_ECHO_REPLY
591			\|\| pkt->id != (uint16_t) magic
592			\|\| pkt->seq != (uint16_t)~magic
593			\|\| !isnormal (pkt->stamp))
594			continue;
595
596	root	1.6	{
597			AV *av = newAV ();
598			av_push (av, newSVpvn ((char *)&sa.sin_addr, 4));
599			av_push (av, newSVnv (now - pkt->stamp));
600			av_push (av, newSVuv (pkt->payload));
601	root	1.1
602	root	1.6	av_push (res_av, newRV_noinc ((SV *)av));
603			}
604	root	1.1	}
605
606			if (res_av)
607			feed_reply (res_av);
608			}
609
610			void
611			_recv_icmp6 (...)
612			CODE:
613			{
614			struct sockaddr_in6 sa;
615			socklen_t sl = sizeof (sa);
616			AV res_av = av_len (cbs) < 0 ? 0 : (AV )sv_2mortal ((SV *)newAV ());
617			PKT pkt;
618			tstamp now = NOW ();
619
620			for (;;)
621			{
622	root	1.2	int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_TRUNC, (struct sockaddr *)&sa, &sl);
623	root	1.1
624			if (len != sizeof (PKT))
625			break;
626
627			if (!res_av
628			\|\| pkt.type != ICMP6_ECHO_REPLY
629			\|\| pkt.id != (uint16_t) magic
630			\|\| pkt.seq != (uint16_t)~magic
631			\|\| !isnormal (pkt.stamp))
632			continue;
633
634	root	1.6	{
635			AV *av = newAV ();
636			av_push (av, newSVpvn ((char *)&sa.sin6_addr, 16));
637			av_push (av, newSVnv (now - pkt.stamp));
638			av_push (av, newSVuv (pkt.payload));
639	root	1.1
640	root	1.6	av_push (res_av, newRV_noinc ((SV *)av));
641			}
642	root	1.1	}
643
644			if (res_av)
645			feed_reply (res_av);
646			}
647