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
#if IPV6
# 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 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;

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

      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);
#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 IPV6
  icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
# 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 ("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 = av_len (cbs) < 0 ? 0 : (AV *)sv_2mortal ((SV *)newAV ());
        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 (!res_av
                || 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));
          }

        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_DONTWAIT | MSG_TRUNC, &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:	1.6
Committed:	Fri May 4 15:44:06 2007 UTC (17 years ago) by root
Branch:	MAIN
Changes since 1.5:	+10 -7 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	root	1.5	#if IPV6
35			# include <netinet/icmp6.h>
36			#endif
37	root	1.4
38			#define ICMP4_ECHO 8
39			#define ICMP4_ECHO_REPLY 0
40			#define ICMP6_ECHO 128
41			#define ICMP6_ECHO_REPLY 129
42	root	1.1
43			#define DRAIN_INTERVAL .000001 // how long to wait when sendto returns ENOBUFS, in seconds
44			#define MIN_INTERVAL .000001 // minimum packet send interval, in seconds
45
46			#define HDR_SIZE_IP4 20
47			#define HDR_SIZE_IP6 48
48
49			//TODO: xread/xwrite for atomicity? we currently rely on the fact that the pip biffersize divides exactly by pointer sizes
50
51			typedef uint8_t addr_t[16];
52
53			typedef double tstamp;
54
55			tstamp
56			NOW ()
57			{
58			struct timeval tv;
59			gettimeofday (&tv, 0);
60			return tv.tv_sec + tv.tv_usec * 0.000001;
61			}
62
63			typedef struct {
64			int family;
65			addr_t lo, hi;
66			double interval;
67			tstamp next;
68			} RANGE;
69
70			typedef struct {
71			SV *id;
72			double interval;
73			int nranges;
74			RANGE *ranges;
75			uint32_t payload;
76			} REQ;
77
78			typedef struct {
79			uint8_t version_ihl;
80			uint8_t tos;
81			uint16_t tot_len;
82
83			uint16_t id;
84			uint16_t flags;
85
86			uint8_t ttl;
87			uint8_t protocol;
88			uint16_t cksum;
89
90			uint32_t src;
91			uint32_t dst;
92			} IP4HDR;
93
94			typedef struct {
95			uint8_t version;
96			uint8_t x1, x2, x3;
97
98			uint16_t payload_len;
99			uint8_t nxt_hdr;
100			uint8_t hop_limit;
101
102			uint8_t src[16];
103			uint8_t dst[16];
104			} IP6HDR;
105
106			#define MAGIC 0xca4c
107
108			typedef struct {
109			uint8_t type, code;
110			uint16_t cksum;
111			uint16_t id, seq;
112	root	1.2	uint32_t payload;
113	root	1.1	tstamp stamp; // be careful when accessing this
114			} PKT;
115
116	root	1.3	static pthread_t pthrid;
117			static int thr_send[2]; // send to worker
118			static int thr_recv[2]; // receive from worker
119	root	1.1
120	root	1.3	static int icmp4_fd, icmp6_fd;
121
122			static AV *cbs;
123	root	1.1
124	root	1.2	static uint16_t
125	root	1.1	icmp_cksum (void *data, unsigned int len)
126			{
127			register int sum = 0;
128			uint16_t *wp;
129
130			assert (~len & 1);
131
132			for (wp = (uint16_t *)data; len; wp++, len -= 2)
133			sum += *wp;
134
135			sum = (sum >> 16) + (sum & 0xffff); /* add high 16 to low 16 */
136			sum += sum >> 16; /* add carry */
137
138			return ~sum;
139			}
140
141			static void
142			inc_addr (addr_t *addr)
143			{
144			int len = sizeof (addr_t) - 1;
145
146			do
147			{
148			if ((*addr)[len] != 0xff)
149			{
150			++(*addr)[len];
151			break;
152			}
153
154			(*addr)[len] = 0;
155			}
156			while (len--);
157			}
158
159			static void *
160			ping_proc (void *unused)
161			{
162			PKT pkt;
163			struct sockaddr_in sa4;
164			#if IPV6
165			struct sockaddr_in6 sa6;
166			#endif
167
168			memset (&pkt, 0, sizeof (pkt));
169
170			memset (&sa4, 0, sizeof (sa4));
171			sa4.sin_family = AF_INET;
172	root	1.3	sa4.sin_port = 0;
173	root	1.1	#if IPV6
174			memset (&sa6, 0, sizeof (sa6));
175			sa6.sin6_family = AF_INET6;
176	root	1.3	sa6.sin6_port = 0;
177	root	1.1	#endif
178
179			for (;;)
180			{
181			REQ *req;
182			int len = read (thr_send [0], &req, sizeof (req));
183
184			if (!len)
185			pthread_exit (0);
186			else if (len != sizeof (req))
187			{
188			perror ("Net::FPing: short reead or read error");
189			pthread_exit ((void *)-1);
190			}
191
192			//TODO: bind to source address
193
194			pkt.code = 0;
195			pkt.id = (uint16_t)MAGIC;
196			pkt.seq = (uint16_t)~MAGIC;
197			pkt.payload = req->payload;
198
199	root	1.4	tstamp now = NOW ();
200			tstamp next = now;
201	root	1.1
202	root	1.5	{
203			int r;
204			for (r = req->nranges; r--; )
205			inc_addr (&req->ranges [r].hi);
206			}
207
208	root	1.1	while (req->nranges)
209			{
210			RANGE *range = req->ranges;
211
212			if (!memcmp (&range->lo, &range->hi, sizeof (addr_t)))
213			req->ranges [0] = req->ranges [--req->nranges];
214			else
215			{
216			// ranges [0] is always the next range to ping
217			tstamp wait = range->next - now;
218
219			// compare with the global frequency limit
220			{
221			tstamp diff = next - now;
222
223			if (wait < diff)
224			wait = diff;
225			else if (range)
226			next = range->next;
227			}
228
229			if (wait > 0.)
230			{
231			struct timespec ts;
232
233			ts.tv_sec = wait;
234			ts.tv_nsec = (wait - ts.tv_sec) * 1000000000.;
235
236			nanosleep (&ts, 0);
237			}
238
239	root	1.4	now = NOW ();
240
241	root	1.1	pkt.stamp = now;
242			pkt.cksum = 0;
243
244			if (range->family == AF_INET)
245			{
246			pkt.type = ICMP4_ECHO;
247	root	1.3	pkt.cksum = icmp_cksum (&pkt, sizeof (pkt));
248	root	1.1
249			memcpy (&sa4.sin_addr,
250			sizeof (addr_t) - sizeof (sa4.sin_addr) + (char *)&range->lo,
251			sizeof (sa4.sin_addr));
252
253	root	1.3	if (sendto (icmp4_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa4, sizeof (sa4)) > 0)
254	root	1.1	errno = 0;
255			}
256			else
257			{
258			#if IPV6
259			pkt.type = ICMP6_ECHO;
260
261			memcpy (&sa6.sin6_addr,
262			sizeof (addr_t) - sizeof (sa6.sin6_addr) + (char *)&range->lo,
263			sizeof (sa6.sin6_addr));
264
265	root	1.3	if (sendto (icmp6_fd, &pkt, sizeof (pkt), 0, (struct sockaddr *)&sa6, sizeof (sa6)) > 0)
266	root	1.1	errno = 0;
267			#endif
268			}
269
270			if (errno == ENOBUFS)
271			{
272			struct timespec ts;
273
274			ts.tv_sec = 0;
275			ts.tv_nsec = DRAIN_INTERVAL * 1000000000;
276
277			nanosleep (&ts, 0);
278			}
279			else
280			{
281			inc_addr (&range->lo);
282
283			range->next = next;
284			range->next += range->interval;
285			}
286
287			next += req->interval;
288			}
289
290			// make a downheap operation
291			int k = 0;
292			int n = 0;
293			for (;;)
294			{
295			++n;
296			int j = k * 2 + 1;
297
298			if (j >= req->nranges)
299			break;
300			else if (j < req->nranges - 1)
301			if (req->ranges [j].next > req->ranges [j + 1].next)
302			++j;
303
304			if (req->ranges [j].next >= req->ranges [k].next)
305			break;
306
307			RANGE temp = req->ranges [k];
308			req->ranges [k] = req->ranges [j];
309			req->ranges [j] = temp;
310
311			k = j;
312			}
313			}
314
315			write (thr_recv [1], &req, sizeof (req));
316			}
317
318			return 0;
319			}
320
321			static void
322	root	1.3	feed_reply (AV *res_av)
323			{
324			if (av_len (res_av) < 0)
325			return;
326
327			dSP;
328			SV res = sv_2mortal (newRV_inc ((SV )res_av));
329			int i;
330
331			ENTER;
332			SAVETMPS;
333
334			for (i = av_len (cbs) + 1; i--; )
335			{
336			SV cb = av_fetch (cbs, i, 1);
337
338			PUSHMARK (SP);
339			XPUSHs (res);
340			PUTBACK;
341			call_sv (cb, G_DISCARD \| G_VOID);
342			}
343
344			FREETMPS;
345			LEAVE;
346			}
347
348			static void
349	root	1.1	boot ()
350			{
351			sigset_t fullsigset, oldsigset;
352			pthread_attr_t attr;
353
354			if (pipe (thr_send) < 0)
355			croak ("Net::FPing: unable to create send pipe");
356
357			if (pipe (thr_recv) < 0)
358			croak ("Net::FPing: unable to create receive pipe");
359
360			icmp4_fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
361	root	1.2	#ifdef ICMP_FILTER
362			{
363	root	1.4	struct icmp_filter oval;
364			oval.data = 0xffffffff & ~(1 << ICMP4_ECHO_REPLY);
365			setsockopt (icmp4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval);
366	root	1.2	}
367			#endif
368
369	root	1.5	#if IPV6
370			icmp6_fd = socket (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
371			# ifdef ICMP6_FILTER
372			{
373			struct icmp6_filter oval;
374			ICMP6_FILTER_SETBLOCKALL (&oval);
375			ICMP6_FILTER_SETPASS (ICMP6_ECHO_REPLY, &oval);
376			setsockopt (icmp6_fd, IPPROTO_ICMPV6, ICMP6_FILTER, &oval, sizeof oval);
377			}
378			# endif
379			#endif
380
381	root	1.1	pthread_attr_init (&attr);
382			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
383			#ifdef PTHREAD_SCOPE_PROCESS
384			pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
385			#endif
386
387			sigfillset (&fullsigset);
388
389			pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
390
391			if (pthread_create (&pthrid, &attr, ping_proc, 0))
392			croak ("Net::FPing: unable to create pinger thread");
393
394			pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
395
396			sv_setiv (get_sv ("Net::FPing::THR_REQ_FD", 1), thr_send [1]);
397			sv_setiv (get_sv ("Net::FPing::THR_RES_FD", 1), thr_recv [0]);
398
399			sv_setiv (get_sv ("Net::FPing::ICMP4_FD", 1), icmp4_fd);
400			sv_setiv (get_sv ("Net::FPing::ICMP6_FD", 1), icmp6_fd);
401			}
402
403			MODULE = Net::FPing PACKAGE = Net::FPing
404
405			BOOT:
406	root	1.2	{
407			HV *stash = gv_stashpv ("Net::FPing", 1);
408
409	root	1.3	cbs = get_av ("Net::FPing::CB", 1);
410
411	root	1.1	boot ();
412
413	root	1.2	newCONSTSUB (stash, "ipv4_supported", newSViv (icmp4_fd >= 0));
414			newCONSTSUB (stash, "ipv6_supported", newSViv (icmp6_fd >= 0));
415
416	root	1.4	newCONSTSUB (stash, "icmp4_pktsize", newSViv (HDR_SIZE_IP4 + sizeof (PKT)));
417			newCONSTSUB (stash, "icmp6_pktsize", newSViv (HDR_SIZE_IP6 + sizeof (PKT)));
418	root	1.2	}
419
420	root	1.1	PROTOTYPES: DISABLE
421
422			SV *
423	root	1.2	_req_icmp_ping (SV ranges, NV interval, U32 payload, SV id)
424	root	1.1	CODE:
425			{
426			if (!SvROK (ranges) \|\| SvTYPE (SvRV (ranges)) != SVt_PVAV)
427			croak ("address ranges must be given as arrayref with lo, hi pairs");
428
429			AV rav = (AV )SvRV (ranges);
430			int nranges = av_len (rav) + 1;
431
432			REQ *req = malloc (sizeof (REQ));
433			int i;
434
435			if (interval < MIN_INTERVAL)
436			interval = MIN_INTERVAL;
437
438			req->id = newSVsv (id);
439			req->interval = interval;
440			req->payload = payload;
441			req->nranges = nranges;
442			req->ranges = (RANGE )malloc (nranges sizeof (RANGE));
443
444			while (nranges--)
445			{
446			SV sv = av_fetch (rav, nranges, 1);
447
448			if (!SvROK (sv) \|\| SvTYPE (SvRV (sv)) != SVt_PVAV)
449			croak ("address range must be given as arrayref with lo, hi, interval arrayrefs");
450
451			AV av = (AV )SvRV (sv);
452			RANGE *r = req->ranges + nranges;
453
454			SV lo = av_fetch (av, 0, 1);
455			SV hi = av_fetch (av, 1, 1);
456
457			sv_utf8_downgrade (lo, 0);
458			sv_utf8_downgrade (hi, 0);
459
460			memset (&r->lo, 0, sizeof (addr_t));
461			memset (&r->hi, 0, sizeof (addr_t));
462
463			if (SvPOKp (lo) && SvPOKp (hi))
464			{
465			if (SvCUR (lo) != SvCUR (hi))
466			croak ("addresses in range must be of the same size (either 4 or 16 bytes)");
467
468			if (SvCUR (lo) == 4)
469			{
470			r->family = AF_INET;
471			memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, SvPVX (lo), 4);
472			memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, SvPVX (hi), 4);
473			}
474			else if (SvCUR (lo) == 16)
475			{
476			#if IPV6
477			r->family = AF_INET6;
478			memcpy (&r->lo, SvPVX (lo), sizeof (addr_t));
479			memcpy (&r->hi, SvPVX (hi), sizeof (addr_t));
480			#else
481			croak ("IPv6 not supported in this configuration");
482			#endif
483			}
484			else
485			croak ("addresses in range must be either 4 (IPv4) or 16 (IPV6) bytes in length");
486			}
487			else if (SvIOK (lo) && SvIOK (hi))
488			{
489			r->family = AF_INET;
490
491			uint32_t addr;
492			addr = htonl (SvUV (lo)); memcpy (sizeof (addr_t) - 4 + (char *)&r->lo, &addr, 4);
493			addr = htonl (SvUV (hi)); memcpy (sizeof (addr_t) - 4 + (char *)&r->hi, &addr, 4);
494			}
495			else
496			croak ("addresses in range must be strings with either 4 (IPv4) or 16 (IPv6) octets");
497
498	root	1.3	if (r->family == AF_INET)
499	root	1.1	{
500			if (icmp4_fd < 0)
501			croak ("Net::FPing: IPv4 ping support not available on this system");
502			}
503			else
504			{
505			if (icmp6_fd < 0)
506			croak ("Net::FPing: IPv6 ping support not available on this system");
507			}
508
509			r->interval = SvNV (*av_fetch (av, 2, 1));
510
511			if (r->interval < req->interval)
512			r->interval = req->interval;
513
514			r->next = 0.;
515			}
516
517			RETVAL = newSVpvn ((char *)&req, sizeof (req));
518			}
519			OUTPUT:
520			RETVAL
521
522			SV *
523			_read_res ()
524			CODE:
525			{
526			REQ *req;
527
528			if (read (thr_recv [0], &req, sizeof (req)) != sizeof (req))
529			RETVAL = &PL_sv_undef;
530
531			RETVAL = req->id;
532			free (req->ranges);
533			free (req);
534			}
535			OUTPUT:
536			RETVAL
537
538			void
539			_recv_icmp4 (...)
540			CODE:
541			{
542			char buf [512];
543			struct sockaddr_in sa;
544			socklen_t sl = sizeof (sa);
545	root	1.6	AV res_av = av_len (cbs) < 0 ? 0 : (AV )sv_2mortal ((SV *)newAV ());
546	root	1.3	tstamp now = NOW ();
547	root	1.1
548			for (;;)
549			{
550			int len = recvfrom (icmp4_fd, buf, sizeof (buf), MSG_DONTWAIT \| MSG_TRUNC, &sa, &sl);
551
552			if (len <= HDR_SIZE_IP4)
553			break;
554
555			IP4HDR iphdr = (IP4HDR )buf;
556
557			int hdrlen = (iphdr->version_ihl & 15) * 4;
558			int totlen = ntohs (iphdr->tot_len);
559
560			// packet corrupt?
561	root	1.6	if (!res_av
562			\|\| totlen > len
563	root	1.1	\|\| iphdr->protocol != IPPROTO_ICMP
564			\|\| hdrlen < HDR_SIZE_IP4 \|\| hdrlen + sizeof (PKT) != totlen)
565			continue;
566
567			PKT pkt = (PKT )(buf + hdrlen);
568
569	root	1.4	if (pkt->type != ICMP4_ECHO_REPLY
570			\|\| pkt->id != (uint16_t) MAGIC
571	root	1.1	\|\| pkt->seq != (uint16_t)~MAGIC
572			\|\| !isnormal (pkt->stamp))
573			continue;
574
575	root	1.3	AV *av = newAV ();
576			av_push (av, newSVpvn ((char *)&sa.sin_addr, 4));
577			av_push (av, newSVnv (now - pkt->stamp));
578			av_push (av, newSVuv (pkt->payload));
579
580			av_push (res_av, newRV_noinc ((SV *)av));
581	root	1.1	}
582
583	root	1.6	if (res_av)
584			feed_reply (res_av);
585	root	1.1	}
586
587			void
588			_recv_icmp6 (...)
589			CODE:
590			{
591	root	1.3	struct sockaddr_in6 sa;
592	root	1.1	socklen_t sl = sizeof (sa);
593	root	1.6	AV res_av = av_len (cbs) < 0 ? 0 : (AV )sv_2mortal ((SV *)newAV ());
594	root	1.3	PKT pkt;
595			tstamp now = NOW ();
596	root	1.1
597			for (;;)
598			{
599	root	1.3	int len = recvfrom (icmp6_fd, &pkt, sizeof (pkt), MSG_DONTWAIT \| MSG_TRUNC, &sa, &sl);
600	root	1.1
601	root	1.3	if (len != sizeof (PKT))
602	root	1.1	break;
603
604	root	1.6	if (!res_av
605			\|\| pkt.type != ICMP6_ECHO_REPLY
606	root	1.4	\|\| pkt.id != (uint16_t) MAGIC
607	root	1.3	\|\| pkt.seq != (uint16_t)~MAGIC
608			\|\| !isnormal (pkt.stamp))
609	root	1.1	continue;
610
611	root	1.3	AV *av = newAV ();
612			av_push (av, newSVpvn ((char *)&sa.sin6_addr, 16));
613			av_push (av, newSVnv (now - pkt.stamp));
614			av_push (av, newSVuv (pkt.payload));
615	root	1.1
616	root	1.3	av_push (res_av, newRV_noinc ((SV *)av));
617	root	1.1	}
618
619	root	1.6	if (res_av)
620			feed_reply (res_av);
621	root	1.1	}
622