AnyEvent-FastPing/FPing.xs

#define _POSIX_C_SOURCE 199309
#define _GNU_SOURCE 1

#define IPV6 1 // if you get compilation problems try to disable IPv6

#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

#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 biffersize divides exactly by pointer sizes

typedef uint8_t addr_t[16];

typedef double tstamp;

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

typedef struct {
  int family;
  addr_t 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

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_t *addr)
{
  int len = sizeof (addr_t) - 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 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 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));

      if (!len)
        pthread_exit (0);
      else if (len != sizeof (req))
        {
          perror ("Net::FPing: short reead 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;

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

      while (req->nranges)
        {
          RANGE *range = req->ranges;

          if (!memcmp (&range->lo, &range->hi, sizeof (addr_t)))
            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_t) - 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 IPV6
                  pkt.type = ICMP6_ECHO;

                  memcpy (&sa6.sin6_addr,
                          sizeof (addr_t) - 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
          int k = 0;
          int n = 0;
          for (;;)
            {
              ++n;
              int j = k * 2 + 1;

              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)
{
  if (av_len (res_av) < 0)
    return;

  dSP;
  SV *res = sv_2mortal (newRV_inc ((SV *)res_av));
  int i;

  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 ("Net::FPing: unable to create send pipe");

  if (pipe (thr_recv) < 0)
    croak ("Net::FPing: unable to create receive pipe");

  icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
#if IPV6
  icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
#endif

#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

  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 ("Net::FPing: unable to create pinger thread");

  pthread_sigmask (SIG_SETMASK, &oldsigset, 0);

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

  sv_setiv (get_sv ("Net::FPing::ICMP4_FD", 1), icmp4_fd);
  sv_setiv (get_sv ("Net::FPing::ICMP6_FD", 1), icmp6_fd);
}

MODULE = Net::FPing             PACKAGE = Net::FPing

BOOT:
{
  HV *stash = gv_stashpv ("Net::FPing", 1);

  cbs = get_av ("Net::FPing::CB", 1);

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

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

        REQ *req = malloc (sizeof (REQ));
        int i;

        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);

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

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

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

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

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

            if (SvPOKp (lo) && SvPOKp (hi))
              {
                if (SvCUR (lo) != SvCUR (hi))
                  croak ("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_t) - 4 + (char *)&r->lo, SvPVX (lo), 4);
                    memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, SvPVX (hi), 4);
                  }
                else if (SvCUR (lo) == 16)
                  {
#if IPV6
                    r->family = AF_INET6;
                    memcpy (&r->lo, SvPVX (lo), sizeof (addr_t));
                    memcpy (&r->hi, SvPVX (hi), sizeof (addr_t));
#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))
              {
                r->family = AF_INET;

                uint32_t addr;
                addr = htonl (SvUV (lo)); memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, &addr, 4);
                addr = htonl (SvUV (hi)); memcpy (sizeof (addr_t) - 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 ("Net::FPing: IPv4 ping support not available on this system");
              }
            else
              {
                if (icmp6_fd < 0)
                  croak ("Net::FPing: 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 = newAV ();
        SV *res_rv = sv_2mortal (newRV_noinc ((SV *)res_av));
        tstamp now = NOW ();

        for (;;)
          {
            int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_DONTWAIT | MSG_TRUNC, &sa, &sl);

            if (len <= HDR_SIZE_IP4)
              break;

            IP4HDR *iphdr = (IP4HDR *)buf;

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

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

            PKT *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));
          }

        feed_reply (res_av);
}

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

        for (;;)
          {
            int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_DONTWAIT | MSG_TRUNC, &sa, &sl);

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

            if (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));
          }

        feed_reply (res_av);
}

Revision:	1.4
Committed:	Fri May 4 15:16:14 2007 UTC (17 years ago) by root
Branch:	MAIN
Changes since 1.3:	+21 -14 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#define _POSIX_C_SOURCE 199309
2			#define _GNU_SOURCE 1
3
4	root	1.2	#define IPV6 1 // if you get compilation problems try to disable IPv6
5	root	1.1
6			#include "EXTERN.h"
7			#include "perl.h"
8			#include "XSUB.h"
9
10			#include <pthread.h>
11
12			#include <math.h>
13			#include <stdio.h>
14			#include <stdlib.h>
15			#include <string.h>
16
17			#include <time.h>
18			#include <poll.h>
19			#include <unistd.h>
20			#include <inttypes.h>
21			#include <fcntl.h>
22			#include <errno.h>
23
24			#include <sys/types.h>
25			#include <sys/time.h>
26			#include <sys/socket.h>
27
28			#include <netinet/in.h>
29			#include <arpa/inet.h>
30
31	root	1.4	#ifdef __linux
32			# include <linux/icmp.h>
33			#endif
34
35			#define ICMP4_ECHO 8
36			#define ICMP4_ECHO_REPLY 0
37			#define ICMP6_ECHO 128
38			#define ICMP6_ECHO_REPLY 129
39	root	1.1
40			#define DRAIN_INTERVAL .000001 // how long to wait when sendto returns ENOBUFS, in seconds
41			#define MIN_INTERVAL .000001 // minimum packet send interval, in seconds
42
43			#define HDR_SIZE_IP4 20
44			#define HDR_SIZE_IP6 48
45
46			//TODO: xread/xwrite for atomicity? we currently rely on the fact that the pip biffersize divides exactly by pointer sizes
47
48			typedef uint8_t addr_t[16];
49
50			typedef double tstamp;
51
52			tstamp
53			NOW ()
54			{
55			struct timeval tv;
56			gettimeofday (&tv, 0);
57			return tv.tv_sec + tv.tv_usec * 0.000001;
58			}
59
60			typedef struct {
61			int family;
62			addr_t lo, hi;
63			double interval;
64			tstamp next;
65			} RANGE;
66
67			typedef struct {
68			SV *id;
69			double interval;
70			int nranges;
71			RANGE *ranges;
72			uint32_t payload;
73			} REQ;
74
75			typedef struct {
76			uint8_t version_ihl;
77			uint8_t tos;
78			uint16_t tot_len;
79
80			uint16_t id;
81			uint16_t flags;
82
83			uint8_t ttl;
84			uint8_t protocol;
85			uint16_t cksum;
86
87			uint32_t src;
88			uint32_t dst;
89			} IP4HDR;
90
91			typedef struct {
92			uint8_t version;
93			uint8_t x1, x2, x3;
94
95			uint16_t payload_len;
96			uint8_t nxt_hdr;
97			uint8_t hop_limit;
98
99			uint8_t src[16];
100			uint8_t dst[16];
101			} IP6HDR;
102
103			#define MAGIC 0xca4c
104
105			typedef struct {
106			uint8_t type, code;
107			uint16_t cksum;
108			uint16_t id, seq;
109	root	1.2	uint32_t payload;
110	root	1.1	tstamp stamp; // be careful when accessing this
111			} PKT;
112
113	root	1.3	static pthread_t pthrid;
114			static int thr_send[2]; // send to worker
115			static int thr_recv[2]; // receive from worker
116	root	1.1
117	root	1.3	static int icmp4_fd, icmp6_fd;
118
119			static AV *cbs;
120	root	1.1
121	root	1.2	static uint16_t
122	root	1.1	icmp_cksum (void *data, unsigned int len)
123			{
124			register int sum = 0;
125			uint16_t *wp;
126
127			assert (~len & 1);
128
129			for (wp = (uint16_t *)data; len; wp++, len -= 2)
130			sum += *wp;
131
132			sum = (sum >> 16) + (sum & 0xffff); /* add high 16 to low 16 */
133			sum += sum >> 16; /* add carry */
134
135			return ~sum;
136			}
137
138			static void
139			inc_addr (addr_t *addr)
140			{
141			int len = sizeof (addr_t) - 1;
142
143			do
144			{
145			if ((*addr)[len] != 0xff)
146			{
147			++(*addr)[len];
148			break;
149			}
150
151			(*addr)[len] = 0;
152			}
153			while (len--);
154			}
155
156			static void *
157			ping_proc (void *unused)
158			{
159			PKT pkt;
160			struct sockaddr_in sa4;
161			#if IPV6
162			struct sockaddr_in6 sa6;
163			#endif
164
165			memset (&pkt, 0, sizeof (pkt));
166
167			memset (&sa4, 0, sizeof (sa4));
168			sa4.sin_family = AF_INET;
169	root	1.3	sa4.sin_port = 0;
170	root	1.1	#if IPV6
171			memset (&sa6, 0, sizeof (sa6));
172			sa6.sin6_family = AF_INET6;
173	root	1.3	sa6.sin6_port = 0;
174	root	1.1	#endif
175
176			for (;;)
177			{
178			REQ *req;
179			int len = read (thr_send [0], &req, sizeof (req));
180
181			if (!len)
182			pthread_exit (0);
183			else if (len != sizeof (req))
184			{
185			perror ("Net::FPing: short reead or read error");
186			pthread_exit ((void *)-1);
187			}
188
189			//TODO: bind to source address
190
191			pkt.code = 0;
192			pkt.id = (uint16_t)MAGIC;
193			pkt.seq = (uint16_t)~MAGIC;
194			pkt.payload = req->payload;
195
196	root	1.4	tstamp now = NOW ();
197			tstamp next = now;
198	root	1.1
199			while (req->nranges)
200			{
201			RANGE *range = req->ranges;
202
203			if (!memcmp (&range->lo, &range->hi, sizeof (addr_t)))
204			req->ranges [0] = req->ranges [--req->nranges];
205			else
206			{
207			// ranges [0] is always the next range to ping
208			tstamp wait = range->next - now;
209
210			// compare with the global frequency limit
211			{
212			tstamp diff = next - now;
213
214			if (wait < diff)
215			wait = diff;
216			else if (range)
217			next = range->next;
218			}
219
220			if (wait > 0.)
221			{
222			struct timespec ts;
223
224			ts.tv_sec = wait;
225			ts.tv_nsec = (wait - ts.tv_sec) * 1000000000.;
226
227			nanosleep (&ts, 0);
228			}
229
230	root	1.4	now = NOW ();
231
232	root	1.1	pkt.stamp = now;
233			pkt.cksum = 0;
234
235			if (range->family == AF_INET)
236			{
237			pkt.type = ICMP4_ECHO;
238	root	1.3	pkt.cksum = icmp_cksum (&pkt, sizeof (pkt));
239	root	1.1
240			memcpy (&sa4.sin_addr,
241			sizeof (addr_t) - sizeof (sa4.sin_addr) + (char *)&range->lo,
242			sizeof (sa4.sin_addr));
243
244	root	1.3	if (sendto (icmp4_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa4, sizeof (sa4)) > 0)
245	root	1.1	errno = 0;
246			}
247			else
248			{
249			#if IPV6
250			pkt.type = ICMP6_ECHO;
251
252			memcpy (&sa6.sin6_addr,
253			sizeof (addr_t) - sizeof (sa6.sin6_addr) + (char *)&range->lo,
254			sizeof (sa6.sin6_addr));
255
256	root	1.3	if (sendto (icmp6_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa6, sizeof (sa6)) > 0)
257	root	1.1	errno = 0;
258			#endif
259			}
260
261			if (errno == ENOBUFS)
262			{
263			struct timespec ts;
264
265			ts.tv_sec = 0;
266			ts.tv_nsec = DRAIN_INTERVAL * 1000000000;
267
268			nanosleep (&ts, 0);
269			}
270			else
271			{
272			inc_addr (&range->lo);
273
274			range->next = next;
275			range->next += range->interval;
276			}
277
278			next += req->interval;
279			}
280
281			// make a downheap operation
282			int k = 0;
283			int n = 0;
284			for (;;)
285			{
286			++n;
287			int j = k * 2 + 1;
288
289			if (j >= req->nranges)
290			break;
291			else if (j < req->nranges - 1)
292			if (req->ranges [j].next > req->ranges [j + 1].next)
293			++j;
294
295			if (req->ranges [j].next >= req->ranges [k].next)
296			break;
297
298			RANGE temp = req->ranges [k];
299			req->ranges [k] = req->ranges [j];
300			req->ranges [j] = temp;
301
302			k = j;
303			}
304			}
305
306			write (thr_recv [1], &req, sizeof (req));
307			}
308
309			return 0;
310			}
311
312			static void
313	root	1.3	feed_reply (AV *res_av)
314			{
315			if (av_len (res_av) < 0)
316			return;
317
318			dSP;
319			SV res = sv_2mortal (newRV_inc ((SV )res_av));
320			int i;
321
322			ENTER;
323			SAVETMPS;
324
325			for (i = av_len (cbs) + 1; i--; )
326			{
327			SV cb = av_fetch (cbs, i, 1);
328
329			PUSHMARK (SP);
330			XPUSHs (res);
331			PUTBACK;
332			call_sv (cb, G_DISCARD \| G_VOID);
333			}
334
335			FREETMPS;
336			LEAVE;
337			}
338
339			static void
340	root	1.1	boot ()
341			{
342			sigset_t fullsigset, oldsigset;
343			pthread_attr_t attr;
344
345			if (pipe (thr_send) < 0)
346			croak ("Net::FPing: unable to create send pipe");
347
348			if (pipe (thr_recv) < 0)
349			croak ("Net::FPing: unable to create receive pipe");
350
351			icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
352	root	1.3	#if IPV6
353			icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
354			#endif
355	root	1.2
356			#ifdef ICMP_FILTER
357			{
358	root	1.4	struct icmp_filter oval;
359			oval.data = 0xffffffff & ~(1 << ICMP4_ECHO_REPLY);
360			setsockopt (icmp4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
361	root	1.2	}
362			#endif
363
364	root	1.1	pthread_attr_init (&attr);
365			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
366			#ifdef PTHREAD_SCOPE_PROCESS
367			pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
368			#endif
369
370			sigfillset (&fullsigset);
371
372			pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
373
374			if (pthread_create (&pthrid, &attr, ping_proc, 0))
375			croak ("Net::FPing: unable to create pinger thread");
376
377			pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
378
379			sv_setiv (get_sv ("Net::FPing::THR_REQ_FD", 1), thr_send [1]);
380			sv_setiv (get_sv ("Net::FPing::THR_RES_FD", 1), thr_recv [0]);
381
382			sv_setiv (get_sv ("Net::FPing::ICMP4_FD", 1), icmp4_fd);
383			sv_setiv (get_sv ("Net::FPing::ICMP6_FD", 1), icmp6_fd);
384			}
385
386			MODULE = Net::FPing PACKAGE = Net::FPing
387
388			BOOT:
389	root	1.2	{
390			HV *stash = gv_stashpv ("Net::FPing", 1);
391
392	root	1.3	cbs = get_av ("Net::FPing::CB", 1);
393
394	root	1.1	boot ();
395
396	root	1.2	newCONSTSUB (stash, "ipv4_supported", newSViv (icmp4_fd >= 0));
397			newCONSTSUB (stash, "ipv6_supported", newSViv (icmp6_fd >= 0));
398
399	root	1.4	newCONSTSUB (stash, "icmp4_pktsize", newSViv (HDR_SIZE_IP4 + sizeof (PKT)));
400			newCONSTSUB (stash, "icmp6_pktsize", newSViv (HDR_SIZE_IP6 + sizeof (PKT)));
401	root	1.2	}
402
403	root	1.1	PROTOTYPES: DISABLE
404
405			SV *
406	root	1.2	_req_icmp_ping (SV ranges, NV interval, U32 payload, SV id)
407	root	1.1	CODE:
408			{
409			if (!SvROK (ranges) \|\| SvTYPE (SvRV (ranges)) != SVt_PVAV)
410			croak ("address ranges must be given as arrayref with lo, hi pairs");
411
412			AV rav = (AV )SvRV (ranges);
413			int nranges = av_len (rav) + 1;
414
415			REQ *req = malloc (sizeof (REQ));
416			int i;
417
418			if (interval < MIN_INTERVAL)
419			interval = MIN_INTERVAL;
420
421			req->id = newSVsv (id);
422			req->interval = interval;
423			req->payload = payload;
424			req->nranges = nranges;
425			req->ranges = (RANGE )malloc (nranges sizeof (RANGE));
426
427			while (nranges--)
428			{
429			SV sv = av_fetch (rav, nranges, 1);
430
431			if (!SvROK (sv) \|\| SvTYPE (SvRV (sv)) != SVt_PVAV)
432			croak ("address range must be given as arrayref with lo, hi, interval arrayrefs");
433
434			AV av = (AV )SvRV (sv);
435			RANGE *r = req->ranges + nranges;
436
437			SV lo = av_fetch (av, 0, 1);
438			SV hi = av_fetch (av, 1, 1);
439
440			sv_utf8_downgrade (lo, 0);
441			sv_utf8_downgrade (hi, 0);
442
443			memset (&r->lo, 0, sizeof (addr_t));
444			memset (&r->hi, 0, sizeof (addr_t));
445
446			if (SvPOKp (lo) && SvPOKp (hi))
447			{
448			if (SvCUR (lo) != SvCUR (hi))
449			croak ("addresses in range must be of the same size (either 4 or 16 bytes)");
450
451			if (SvCUR (lo) == 4)
452			{
453			r->family = AF_INET;
454			memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, SvPVX (lo), 4);
455			memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, SvPVX (hi), 4);
456			}
457			else if (SvCUR (lo) == 16)
458			{
459			#if IPV6
460			r->family = AF_INET6;
461			memcpy (&r->lo, SvPVX (lo), sizeof (addr_t));
462			memcpy (&r->hi, SvPVX (hi), sizeof (addr_t));
463			#else
464			croak ("IPv6 not supported in this configuration");
465			#endif
466			}
467			else
468			croak ("addresses in range must be either 4 (IPv4) or 16 (IPV6) bytes in length");
469			}
470			else if (SvIOK (lo) && SvIOK (hi))
471			{
472			r->family = AF_INET;
473
474			uint32_t addr;
475			addr = htonl (SvUV (lo)); memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, &addr, 4);
476			addr = htonl (SvUV (hi)); memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, &addr, 4);
477			}
478			else
479			croak ("addresses in range must be strings with either 4 (IPv4) or 16 (IPv6) octets");
480
481	root	1.3	if (r->family == AF_INET)
482	root	1.1	{
483			if (icmp4_fd < 0)
484			croak ("Net::FPing: IPv4 ping support not available on this system");
485			}
486			else
487			{
488			if (icmp6_fd < 0)
489			croak ("Net::FPing: IPv6 ping support not available on this system");
490			}
491
492			r->interval = SvNV (*av_fetch (av, 2, 1));
493
494			if (r->interval < req->interval)
495			r->interval = req->interval;
496
497			r->next = 0.;
498			}
499
500			RETVAL = newSVpvn ((char *)&req, sizeof (req));
501			}
502			OUTPUT:
503			RETVAL
504
505			SV *
506			_read_res ()
507			CODE:
508			{
509			REQ *req;
510
511			if (read (thr_recv [0], &req, sizeof (req)) != sizeof (req))
512			RETVAL = &PL_sv_undef;
513
514			RETVAL = req->id;
515			free (req->ranges);
516			free (req);
517			}
518			OUTPUT:
519			RETVAL
520
521			void
522			_recv_icmp4 (...)
523			CODE:
524			{
525			char buf [512];
526			struct sockaddr_in sa;
527			socklen_t sl = sizeof (sa);
528			AV *res_av = newAV ();
529			SV res_rv = sv_2mortal (newRV_noinc ((SV )res_av));
530	root	1.3	tstamp now = NOW ();
531	root	1.1
532			for (;;)
533			{
534			int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_DONTWAIT \| MSG_TRUNC, &sa, &sl);
535
536			if (len <= HDR_SIZE_IP4)
537			break;
538
539			IP4HDR iphdr = (IP4HDR )buf;
540
541			int hdrlen = (iphdr->version_ihl & 15) * 4;
542			int totlen = ntohs (iphdr->tot_len);
543
544			// packet corrupt?
545			if (totlen > len
546			\|\| iphdr->protocol != IPPROTO_ICMP
547			\|\| hdrlen < HDR_SIZE_IP4 \|\| hdrlen + sizeof (PKT) != totlen)
548			continue;
549
550			PKT pkt = (PKT )(buf + hdrlen);
551
552	root	1.4	if (pkt->type != ICMP4_ECHO_REPLY
553			\|\| pkt->id != (uint16_t) MAGIC
554	root	1.1	\|\| pkt->seq != (uint16_t)~MAGIC
555			\|\| !isnormal (pkt->stamp))
556			continue;
557
558	root	1.3	AV *av = newAV ();
559			av_push (av, newSVpvn ((char *)&sa.sin_addr, 4));
560			av_push (av, newSVnv (now - pkt->stamp));
561			av_push (av, newSVuv (pkt->payload));
562
563			av_push (res_av, newRV_noinc ((SV *)av));
564	root	1.1	}
565
566	root	1.3	feed_reply (res_av);
567	root	1.1	}
568
569			void
570			_recv_icmp6 (...)
571			CODE:
572			{
573	root	1.3	struct sockaddr_in6 sa;
574	root	1.1	socklen_t sl = sizeof (sa);
575			AV res_av = (AV )sv_2mortal ((SV *)newAV ());
576	root	1.3	PKT pkt;
577			tstamp now = NOW ();
578	root	1.1
579			for (;;)
580			{
581	root	1.3	int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_DONTWAIT \| MSG_TRUNC, &sa, &sl);
582	root	1.1
583	root	1.3	if (len != sizeof (PKT))
584	root	1.1	break;
585
586	root	1.4	if (pkt.type != ICMP6_ECHO_REPLY
587			\|\| pkt.id != (uint16_t) MAGIC
588	root	1.3	\|\| pkt.seq != (uint16_t)~MAGIC
589			\|\| !isnormal (pkt.stamp))
590	root	1.1	continue;
591
592	root	1.3	AV *av = newAV ();
593			av_push (av, newSVpvn ((char *)&sa.sin6_addr, 16));
594			av_push (av, newSVnv (now - pkt.stamp));
595			av_push (av, newSVuv (pkt.payload));
596	root	1.1
597	root	1.3	av_push (res_av, newRV_noinc ((SV *)av));
598	root	1.1	}
599
600	root	1.3	feed_reply (res_av);
601	root	1.1	}
602