c64060c0ba2ad7ef27bd1e30a13c43e2ef88e616
1 /**
2 * Object oriented C module to send ICMP and ICMPv6 `echo's.
3 * Copyright (C) 2006-2009 Florian octo Forster <octo at verplant.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; only version 2 of the License is
8 * applicable.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
20 #if HAVE_CONFIG_H
21 # include <config.h>
22 #endif
24 #if STDC_HEADERS
25 # include <stdlib.h>
26 # include <stdio.h>
27 # include <string.h>
28 # include <stdint.h>
29 # include <inttypes.h>
30 # include <errno.h>
31 # include <assert.h>
32 #else
33 # error "You don't have the standard C99 header files installed"
34 #endif /* STDC_HEADERS */
36 #if HAVE_UNISTD_H
37 # include <unistd.h>
38 #endif
40 #if HAVE_FCNTL_H
41 # include <fcntl.h>
42 #endif
43 #if HAVE_SYS_TYPES_H
44 # include <sys/types.h>
45 #endif
46 #if HAVE_SYS_STAT_H
47 # include <sys/stat.h>
48 #endif
50 #if TIME_WITH_SYS_TIME
51 # include <sys/time.h>
52 # include <time.h>
53 #else
54 # if HAVE_SYS_TIME_H
55 # include <sys/time.h>
56 # else
57 # include <time.h>
58 # endif
59 #endif
61 #if HAVE_SYS_SOCKET_H
62 # include <sys/socket.h>
63 #endif
64 #if HAVE_NETDB_H
65 # include <netdb.h>
66 #endif
68 #if HAVE_NETINET_IN_SYSTM_H
69 # include <netinet/in_systm.h>
70 #endif
71 #if HAVE_NETINET_IN_H
72 # include <netinet/in.h>
73 #endif
74 #if HAVE_NETINET_IP_H
75 # include <netinet/ip.h>
76 #endif
77 #if HAVE_NETINET_IP_ICMP_H
78 # include <netinet/ip_icmp.h>
79 #endif
80 #ifdef HAVE_NETINET_IP_VAR_H
81 # include <netinet/ip_var.h>
82 #endif
83 #if HAVE_NETINET_IP6_H
84 # include <netinet/ip6.h>
85 #endif
86 #if HAVE_NETINET_ICMP6_H
87 # include <netinet/icmp6.h>
88 #endif
90 #include "oping.h"
92 #if WITH_DEBUG
93 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
94 #else
95 # define dprintf(...) /**/
96 #endif
98 #define PING_ERRMSG_LEN 256
100 struct pinghost
101 {
102 /* username: name passed in by the user */
103 char *username;
104 /* hostname: name returned by the reverse lookup */
105 char *hostname;
106 struct sockaddr_storage *addr;
107 socklen_t addrlen;
108 int addrfamily;
109 int fd;
110 int ident;
111 int sequence;
112 struct timeval *timer;
113 double latency;
114 uint32_t dropped;
115 char *data;
117 void *context;
119 struct pinghost *next;
120 };
122 struct pingobj
123 {
124 double timeout;
125 int ttl;
126 int addrfamily;
127 char *data;
129 struct sockaddr_storage *srcaddr;
130 socklen_t srcaddrlen;
132 char errmsg[PING_ERRMSG_LEN];
134 pinghost_t *head;
135 };
137 /*
138 * private (static) functions
139 */
140 /* Even though Posix requires "strerror_r" to return an "int",
141 * some systems (e.g. the GNU libc) return a "char *" _and_
142 * ignore the second argument ... -tokkee */
143 char *sstrerror (int errnum, char *buf, size_t buflen)
144 {
145 buf[0] = 0;
147 #if !HAVE_STRERROR_R
148 {
149 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
150 }
151 /* #endif !HAVE_STRERROR_R */
153 #elif STRERROR_R_CHAR_P
154 {
155 char *temp;
156 temp = strerror_r (errnum, buf, buflen);
157 if (buf[0] == 0)
158 {
159 if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
160 strncpy (buf, temp, buflen);
161 else
162 strncpy (buf, "strerror_r did not return "
163 "an error message", buflen);
164 }
165 }
166 /* #endif STRERROR_R_CHAR_P */
168 #else
169 if (strerror_r (errnum, buf, buflen) != 0)
170 {
171 snprintf (buf, buflen, "Error %i (%#x); "
172 "Additionally, strerror_r failed.",
173 errnum, errnum);
174 }
175 #endif /* STRERROR_R_CHAR_P */
177 buf[buflen - 1] = 0;
179 return (buf);
180 } /* char *sstrerror */
182 static void ping_set_error (pingobj_t *obj, const char *function,
183 const char *message)
184 {
185 snprintf (obj->errmsg, sizeof (obj->errmsg),
186 "%s: %s", function, message);
187 obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
188 }
190 static void ping_set_errno (pingobj_t *obj, const char *function,
191 int error_number)
192 {
193 sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
194 }
196 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
197 struct timeval *res)
198 {
199 res->tv_sec = tv1->tv_sec + tv2->tv_sec;
200 res->tv_usec = tv1->tv_usec + tv2->tv_usec;
202 while (res->tv_usec > 1000000)
203 {
204 res->tv_usec -= 1000000;
205 res->tv_sec++;
206 }
208 return (0);
209 }
211 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
212 struct timeval *res)
213 {
214 if ((tv1->tv_sec < tv2->tv_sec)
215 || ((tv1->tv_sec == tv2->tv_sec)
216 && (tv1->tv_usec < tv2->tv_usec)))
217 return (-1);
219 res->tv_sec = tv1->tv_sec - tv2->tv_sec;
220 res->tv_usec = tv1->tv_usec - tv2->tv_usec;
222 assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
224 while (res->tv_usec < 0)
225 {
226 res->tv_usec += 1000000;
227 res->tv_sec--;
228 }
230 return (0);
231 }
233 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
234 {
235 uint32_t sum = 0;
236 uint16_t ret = 0;
238 uint16_t *ptr;
240 for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
241 sum += *ptr;
243 if (len == 1)
244 {
245 *(char *) &ret = *(char *) ptr;
246 sum += ret;
247 }
249 /* Do this twice to get all possible carries.. */
250 sum = (sum >> 16) + (sum & 0xFFFF);
251 sum = (sum >> 16) + (sum & 0xFFFF);
253 ret = ~sum;
255 return (ret);
256 }
258 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
259 {
260 struct ip *ip_hdr;
261 struct icmp *icmp_hdr;
263 size_t ip_hdr_len;
265 uint16_t recv_checksum;
266 uint16_t calc_checksum;
268 uint16_t ident;
269 uint16_t seq;
271 pinghost_t *ptr;
273 if (buffer_len < sizeof (struct ip))
274 return (NULL);
276 ip_hdr = (struct ip *) buffer;
277 ip_hdr_len = ip_hdr->ip_hl << 2;
279 if (buffer_len < ip_hdr_len)
280 return (NULL);
282 buffer += ip_hdr_len;
283 buffer_len -= ip_hdr_len;
285 if (buffer_len < sizeof (struct icmp))
286 return (NULL);
288 icmp_hdr = (struct icmp *) buffer;
289 buffer += sizeof (struct icmp);
290 buffer_len -= sizeof (struct icmp);
292 if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
293 {
294 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
295 return (NULL);
296 }
298 recv_checksum = icmp_hdr->icmp_cksum;
299 icmp_hdr->icmp_cksum = 0;
300 calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
301 sizeof (struct icmp) + buffer_len);
303 if (recv_checksum != calc_checksum)
304 {
305 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
306 recv_checksum, calc_checksum);
307 return (NULL);
308 }
310 ident = ntohs (icmp_hdr->icmp_id);
311 seq = ntohs (icmp_hdr->icmp_seq);
313 for (ptr = ph; ptr != NULL; ptr = ptr->next)
314 {
315 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
316 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
318 if (ptr->addrfamily != AF_INET)
319 continue;
321 if (!timerisset (ptr->timer))
322 continue;
324 if (ptr->ident != ident)
325 continue;
327 if (((ptr->sequence - 1) & 0xFFFF) != seq)
328 continue;
330 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
331 ptr->hostname, ident, seq);
333 break;
334 }
336 if (ptr == NULL)
337 {
338 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
339 ident, seq);
340 }
342 return (ptr);
343 }
345 #ifndef ICMP6_ECHO_REQUEST
346 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
347 # define ICMP6_ECHO_REQUEST ICMP6_ECHO
348 # else
349 # define ICMP6_ECHO_REQUEST 128
350 # endif
351 #endif
353 #ifndef ICMP6_ECHO_REPLY
354 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
355 # define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
356 # else
357 # define ICMP6_ECHO_REPLY 129
358 # endif
359 #endif
361 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
362 {
363 struct icmp6_hdr *icmp_hdr;
365 uint16_t ident;
366 uint16_t seq;
368 pinghost_t *ptr;
370 if (buffer_len < sizeof (struct icmp6_hdr))
371 return (NULL);
373 icmp_hdr = (struct icmp6_hdr *) buffer;
374 buffer += sizeof (struct icmp);
375 buffer_len -= sizeof (struct icmp);
377 if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
378 {
379 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
380 return (NULL);
381 }
383 if (icmp_hdr->icmp6_code != 0)
384 {
385 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
386 return (NULL);
387 }
389 ident = ntohs (icmp_hdr->icmp6_id);
390 seq = ntohs (icmp_hdr->icmp6_seq);
392 for (ptr = ph; ptr != NULL; ptr = ptr->next)
393 {
394 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
395 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
397 if (ptr->addrfamily != AF_INET6)
398 continue;
400 if (!timerisset (ptr->timer))
401 continue;
403 if (ptr->ident != ident)
404 continue;
406 if (((ptr->sequence - 1) & 0xFFFF) != seq)
407 continue;
409 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
410 ptr->hostname, ident, seq);
412 break;
413 }
415 if (ptr == NULL)
416 {
417 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
418 ident, seq);
419 }
421 return (ptr);
422 }
424 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
425 {
426 char buffer[4096];
427 ssize_t buffer_len;
429 struct timeval diff;
431 pinghost_t *host = NULL;
433 struct sockaddr_storage sa;
434 socklen_t sa_len;
436 sa_len = sizeof (sa);
438 buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
439 (struct sockaddr *) &sa, &sa_len);
440 if (buffer_len < 0)
441 {
442 #if WITH_DEBUG
443 char errbuf[PING_ERRMSG_LEN];
444 dprintf ("recvfrom: %s\n",
445 sstrerror (errno, errbuf, sizeof (errbuf)));
446 #endif
447 return (-1);
448 }
450 dprintf ("Read %zi bytes from fd = %i\n", buffer_len, fd);
452 if (sa.ss_family == AF_INET)
453 {
454 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
455 return (-1);
456 }
457 else if (sa.ss_family == AF_INET6)
458 {
459 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
460 return (-1);
461 }
463 dprintf ("rcvd: %12i.%06i\n",
464 (int) now->tv_sec,
465 (int) now->tv_usec);
466 dprintf ("sent: %12i.%06i\n",
467 (int) host->timer->tv_sec,
468 (int) host->timer->tv_usec);
470 if (ping_timeval_sub (now, host->timer, &diff) < 0)
471 {
472 timerclear (host->timer);
473 return (-1);
474 }
476 dprintf ("diff: %12i.%06i\n",
477 (int) diff.tv_sec,
478 (int) diff.tv_usec);
480 host->latency = ((double) diff.tv_usec) / 1000.0;
481 host->latency += ((double) diff.tv_sec) * 1000.0;
483 timerclear (host->timer);
485 return (0);
486 }
488 static int ping_receive_all (pingobj_t *obj)
489 {
490 fd_set readfds;
491 int num_readfds;
492 int max_readfds;
494 pinghost_t *ph;
495 pinghost_t *ptr;
497 struct timeval endtime;
498 struct timeval nowtime;
499 struct timeval timeout;
500 int status;
502 int ret;
504 ph = obj->head;
505 ret = 0;
507 for (ptr = ph; ptr != NULL; ptr = ptr->next)
508 ptr->latency = -1.0;
510 if (gettimeofday (&nowtime, NULL) == -1)
511 {
512 ping_set_errno (obj, "gettimeofday", errno);
513 return (-1);
514 }
516 /* Set up timeout */
517 timeout.tv_sec = (time_t) obj->timeout;
518 timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
520 dprintf ("Set timeout to %i.%06i seconds\n",
521 (int) timeout.tv_sec,
522 (int) timeout.tv_usec);
524 ping_timeval_add (&nowtime, &timeout, &endtime);
526 while (1)
527 {
528 FD_ZERO (&readfds);
529 num_readfds = 0;
530 max_readfds = -1;
532 for (ptr = ph; ptr != NULL; ptr = ptr->next)
533 {
534 if (!timerisset (ptr->timer))
535 continue;
537 FD_SET (ptr->fd, &readfds);
538 num_readfds++;
540 if (max_readfds < ptr->fd)
541 max_readfds = ptr->fd;
542 }
544 if (num_readfds == 0)
545 break;
547 if (gettimeofday (&nowtime, NULL) == -1)
548 {
549 ping_set_errno (obj, "gettimeofday", errno);
550 return (-1);
551 }
553 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
554 break;
556 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
557 (int) timeout.tv_sec,
558 (int) timeout.tv_usec);
560 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
562 if (gettimeofday (&nowtime, NULL) == -1)
563 {
564 ping_set_errno (obj, "gettimeofday", errno);
565 return (-1);
566 }
568 if ((status == -1) && (errno == EINTR))
569 {
570 dprintf ("select was interrupted by signal..\n");
571 continue;
572 }
573 else if (status < 0)
574 {
575 #if WITH_DEBUG
576 char errbuf[PING_ERRMSG_LEN];
577 dprintf ("select: %s\n",
578 sstrerror (errno, errbuf, sizeof (errbuf)));
579 #endif
580 break;
581 }
582 else if (status == 0)
583 {
584 dprintf ("select timed out\n");
585 for (ptr = ph; ptr != NULL; ptr = ptr->next)
586 if (ptr->latency < 0.0)
587 ptr->dropped++;
588 break;
589 }
591 for (ptr = ph; ptr != NULL; ptr = ptr->next)
592 {
593 if (FD_ISSET (ptr->fd, &readfds))
594 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
595 ret++;
596 }
597 } /* while (1) */
599 return (ret);
600 }
602 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
603 * Sending functions: *
604 * *
605 * ping_send_all *
606 * +-> ping_send_one_ipv4 *
607 * `-> ping_send_one_ipv6 *
608 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
609 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
610 const void *buf, size_t buflen)
611 {
612 ssize_t ret;
614 if (gettimeofday (ph->timer, NULL) == -1)
615 {
616 timerclear (ph->timer);
617 return (-1);
618 }
620 ret = sendto (ph->fd, buf, buflen, 0,
621 (struct sockaddr *) ph->addr, ph->addrlen);
623 if (ret < 0)
624 {
625 #if defined(EHOSTUNREACH)
626 if (errno == EHOSTUNREACH)
627 return (0);
628 #endif
629 #if defined(ENETUNREACH)
630 if (errno == ENETUNREACH)
631 return (0);
632 #endif
633 ping_set_errno (obj, "sendto", errno);
634 }
636 return (ret);
637 }
639 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
640 {
641 struct icmp *icmp4;
642 int status;
644 char buf[4096];
645 int buflen;
647 char *data;
648 int datalen;
650 dprintf ("ph->hostname = %s\n", ph->hostname);
652 memset (buf, '\0', sizeof (buf));
653 icmp4 = (struct icmp *) buf;
654 data = (char *) (icmp4 + 1);
656 icmp4->icmp_type = ICMP_ECHO;
657 icmp4->icmp_code = 0;
658 icmp4->icmp_cksum = 0;
659 icmp4->icmp_id = htons (ph->ident);
660 icmp4->icmp_seq = htons (ph->sequence);
662 buflen = 4096 - sizeof (struct icmp);
663 strncpy (data, ph->data, buflen);
664 datalen = strlen (data);
666 buflen = datalen + sizeof (struct icmp);
668 icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
670 dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
672 status = ping_sendto (obj, ph, buf, buflen);
673 if (status < 0)
674 {
675 perror ("ping_sendto");
676 return (-1);
677 }
679 dprintf ("sendto: status = %i\n", status);
681 return (0);
682 }
684 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
685 {
686 struct icmp6_hdr *icmp6;
687 int status;
689 char buf[4096];
690 int buflen;
692 char *data;
693 int datalen;
695 dprintf ("ph->hostname = %s\n", ph->hostname);
697 memset (buf, '\0', sizeof (buf));
698 icmp6 = (struct icmp6_hdr *) buf;
699 data = (char *) (icmp6 + 1);
701 icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
702 icmp6->icmp6_code = 0;
703 /* The checksum will be calculated by the TCP/IP stack. */
704 /* FIXME */
705 icmp6->icmp6_cksum = 0;
706 icmp6->icmp6_id = htons (ph->ident);
707 icmp6->icmp6_seq = htons (ph->sequence);
709 buflen = 4096 - sizeof (struct icmp6_hdr);
710 strncpy (data, ph->data, buflen);
711 datalen = strlen (data);
713 buflen = datalen + sizeof (struct icmp6_hdr);
715 dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
717 status = ping_sendto (obj, ph, buf, buflen);
718 if (status < 0)
719 {
720 perror ("ping_sendto");
721 return (-1);
722 }
724 dprintf ("sendto: status = %i\n", status);
726 return (0);
727 }
729 static int ping_send_all (pingobj_t *obj)
730 {
731 pinghost_t *ph;
732 pinghost_t *ptr;
734 int ret;
736 ret = 0;
737 ph = obj->head;
739 for (ptr = ph; ptr != NULL; ptr = ptr->next)
740 {
741 /* start timer.. The GNU `ping6' starts the timer before
742 * sending the packet, so I will do that too */
743 if (gettimeofday (ptr->timer, NULL) == -1)
744 {
745 #if WITH_DEBUG
746 char errbuf[PING_ERRMSG_LEN];
747 dprintf ("gettimeofday: %s\n",
748 sstrerror (errno, errbuf, sizeof (errbuf)));
749 #endif
750 timerclear (ptr->timer);
751 ret--;
752 continue;
753 }
754 else
755 {
756 dprintf ("timer set for hostname = %s\n", ptr->hostname);
757 }
759 if (ptr->addrfamily == AF_INET6)
760 {
761 dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
762 if (ping_send_one_ipv6 (obj, ptr) != 0)
763 {
764 timerclear (ptr->timer);
765 ret--;
766 continue;
767 }
768 }
769 else if (ptr->addrfamily == AF_INET)
770 {
771 dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
772 if (ping_send_one_ipv4 (obj, ptr) != 0)
773 {
774 timerclear (ptr->timer);
775 ret--;
776 continue;
777 }
778 }
779 else /* this should not happen */
780 {
781 dprintf ("Unknown address family: %i\n", ptr->addrfamily);
782 timerclear (ptr->timer);
783 ret--;
784 continue;
785 }
787 ptr->sequence++;
788 }
790 return (ret);
791 }
793 /*
794 * Set the TTL of a socket protocol independently.
795 */
796 static int ping_set_ttl (pinghost_t *ph, int ttl)
797 {
798 int ret = -2;
800 if (ph->addrfamily == AF_INET)
801 {
802 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
803 }
804 else if (ph->addrfamily == AF_INET6)
805 {
806 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
807 }
809 return (ret);
810 }
812 static int ping_get_ident (void)
813 {
814 int fd;
815 static int did_seed = 0;
817 int retval;
819 if (did_seed == 0)
820 {
821 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
822 {
823 unsigned int seed;
825 if (read (fd, &seed, sizeof (seed)) != -1)
826 {
827 did_seed = 1;
828 dprintf ("Random seed: %#x\n", seed);
829 srandom (seed);
830 }
832 close (fd);
833 }
834 #if WITH_DEBUG
835 else
836 {
837 char errbuf[PING_ERRMSG_LEN];
838 dprintf ("open (/dev/urandom): %s\n",
839 sstrerror (errno, errbuf, sizeof (errbuf)));
840 }
841 #endif
842 }
844 retval = (int) random ();
846 dprintf ("Random number: %#x\n", retval);
848 return (retval);
849 }
851 static pinghost_t *ping_alloc (void)
852 {
853 pinghost_t *ph;
854 size_t ph_size;
856 ph_size = sizeof (pinghost_t)
857 + sizeof (struct sockaddr_storage)
858 + sizeof (struct timeval);
860 ph = (pinghost_t *) malloc (ph_size);
861 if (ph == NULL)
862 return (NULL);
864 memset (ph, '\0', ph_size);
866 ph->timer = (struct timeval *) (ph + 1);
867 ph->addr = (struct sockaddr_storage *) (ph->timer + 1);
869 ph->addrlen = sizeof (struct sockaddr_storage);
870 ph->fd = -1;
871 ph->latency = -1.0;
872 ph->dropped = 0;
873 ph->ident = ping_get_ident () & 0xFFFF;
875 return (ph);
876 }
878 static void ping_free (pinghost_t *ph)
879 {
880 if (ph->fd >= 0)
881 close (ph->fd);
883 if (ph->username != NULL)
884 free (ph->username);
886 if (ph->hostname != NULL)
887 free (ph->hostname);
889 if (ph->data != NULL)
890 free (ph->data);
892 free (ph);
893 }
895 /*
896 * public methods
897 */
898 const char *ping_get_error (pingobj_t *obj)
899 {
900 return (obj->errmsg);
901 }
903 pingobj_t *ping_construct (void)
904 {
905 pingobj_t *obj;
907 if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
908 return (NULL);
909 memset (obj, '\0', sizeof (pingobj_t));
911 obj->timeout = PING_DEF_TIMEOUT;
912 obj->ttl = PING_DEF_TTL;
913 obj->addrfamily = PING_DEF_AF;
914 obj->data = strdup (PING_DEF_DATA);
916 return (obj);
917 }
919 void ping_destroy (pingobj_t *obj)
920 {
921 pinghost_t *current;
922 pinghost_t *next;
924 current = obj->head;
925 next = NULL;
927 while (current != NULL)
928 {
929 next = current->next;
930 ping_free (current);
931 current = next;
932 }
934 if (obj->data != NULL)
935 free (obj->data);
937 if (obj->srcaddr != NULL)
938 free (obj->srcaddr);
940 free (obj);
942 return;
943 }
945 int ping_setopt (pingobj_t *obj, int option, void *value)
946 {
947 int ret = 0;
949 switch (option)
950 {
951 case PING_OPT_TIMEOUT:
952 obj->timeout = *((double *) value);
953 if (obj->timeout < 0.0)
954 {
955 obj->timeout = PING_DEF_TIMEOUT;
956 ret = -1;
957 }
958 break;
960 case PING_OPT_TTL:
961 obj->ttl = *((int *) value);
962 if ((obj->ttl < 1) || (obj->ttl > 255))
963 {
964 obj->ttl = PING_DEF_TTL;
965 ret = -1;
966 }
967 break;
969 case PING_OPT_AF:
970 obj->addrfamily = *((int *) value);
971 if ((obj->addrfamily != AF_UNSPEC)
972 && (obj->addrfamily != AF_INET)
973 && (obj->addrfamily != AF_INET6))
974 {
975 obj->addrfamily = PING_DEF_AF;
976 ret = -1;
977 }
978 if (obj->srcaddr != NULL)
979 {
980 free (obj->srcaddr);
981 obj->srcaddr = NULL;
982 }
983 break;
985 case PING_OPT_DATA:
986 if (obj->data != NULL)
987 {
988 free (obj->data);
989 obj->data = NULL;
990 }
991 obj->data = strdup ((const char *) value);
992 break;
994 case PING_OPT_SOURCE:
995 {
996 char *hostname = (char *) value;
997 struct addrinfo ai_hints;
998 struct addrinfo *ai_list;
999 int status;
1000 #if WITH_DEBUG
1001 if (obj->addrfamily != AF_UNSPEC)
1002 {
1003 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1004 }
1005 #endif
1006 memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1007 ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1008 #if defined(AI_ADDRCONFIG)
1009 ai_hints.ai_flags = AI_ADDRCONFIG;
1010 #endif
1011 status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1012 if (status != 0)
1013 {
1014 #if defined(EAI_SYSTEM)
1015 char errbuf[PING_ERRMSG_LEN];
1016 #endif
1017 ping_set_error (obj, "getaddrinfo",
1018 #if defined(EAI_SYSTEM)
1019 (status == EAI_SYSTEM)
1020 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1021 #endif
1022 gai_strerror (status));
1023 ret = -1;
1024 break;
1025 }
1026 #if WITH_DEBUG
1027 if (ai_list->ai_next != NULL)
1028 {
1029 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1030 }
1031 #endif
1032 if (obj->srcaddr == NULL)
1033 {
1034 obj->srcaddrlen = 0;
1035 obj->srcaddr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage));
1036 if (obj->srcaddr == NULL)
1037 {
1038 ping_set_errno (obj, "malloc", errno);
1039 ret = -1;
1040 freeaddrinfo (ai_list);
1041 break;
1042 }
1043 }
1044 memset ((void *) obj->srcaddr, '\0', sizeof (struct sockaddr_storage));
1045 assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1046 memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1047 ai_list->ai_addrlen);
1048 obj->srcaddrlen = ai_list->ai_addrlen;
1049 obj->addrfamily = ai_list->ai_family;
1051 freeaddrinfo (ai_list);
1052 } /* case PING_OPT_SOURCE */
1053 break;
1055 default:
1056 ret = -2;
1057 } /* switch (option) */
1059 return (ret);
1060 } /* int ping_setopt */
1063 int ping_send (pingobj_t *obj)
1064 {
1065 int ret;
1067 if (ping_send_all (obj) < 0)
1068 return (-1);
1070 if ((ret = ping_receive_all (obj)) < 0)
1071 return (-2);
1073 return (ret);
1074 }
1076 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1077 {
1078 while (ph != NULL)
1079 {
1080 if (strcasecmp (ph->username, host) == 0)
1081 break;
1083 ph = ph->next;
1084 }
1086 return (ph);
1087 }
1089 int ping_host_add (pingobj_t *obj, const char *host)
1090 {
1091 pinghost_t *ph;
1093 struct sockaddr_storage sockaddr;
1094 socklen_t sockaddr_len;
1096 struct addrinfo ai_hints;
1097 struct addrinfo *ai_list, *ai_ptr;
1098 int ai_return;
1100 dprintf ("host = %s\n", host);
1102 if (ping_host_search (obj->head, host) != NULL)
1103 return (0);
1105 memset (&ai_hints, '\0', sizeof (ai_hints));
1106 ai_hints.ai_flags = 0;
1107 #ifdef AI_ADDRCONFIG
1108 ai_hints.ai_flags |= AI_ADDRCONFIG;
1109 #endif
1110 #ifdef AI_CANONNAME
1111 ai_hints.ai_flags |= AI_CANONNAME;
1112 #endif
1113 ai_hints.ai_family = obj->addrfamily;
1114 ai_hints.ai_socktype = SOCK_RAW;
1116 if ((ph = ping_alloc ()) == NULL)
1117 {
1118 dprintf ("Out of memory!\n");
1119 return (-1);
1120 }
1122 if ((ph->username = strdup (host)) == NULL)
1123 {
1124 dprintf ("Out of memory!\n");
1125 ping_set_errno (obj, "strdup", errno);
1126 ping_free (ph);
1127 return (-1);
1128 }
1130 if ((ph->hostname = strdup (host)) == NULL)
1131 {
1132 dprintf ("Out of memory!\n");
1133 ping_set_errno (obj, "strdup", errno);
1134 ping_free (ph);
1135 return (-1);
1136 }
1138 /* obj->data is not garuanteed to be != NULL */
1139 if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1140 {
1141 dprintf ("Out of memory!\n");
1142 ping_set_errno (obj, "strdup", errno);
1143 ping_free (ph);
1144 return (-1);
1145 }
1147 if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1148 {
1149 #if defined(EAI_SYSTEM)
1150 char errbuf[PING_ERRMSG_LEN];
1151 #endif
1152 dprintf ("getaddrinfo failed\n");
1153 ping_set_error (obj, "getaddrinfo",
1154 #if defined(EAI_SYSTEM)
1155 (ai_return == EAI_SYSTEM)
1156 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1157 #endif
1158 gai_strerror (ai_return));
1159 ping_free (ph);
1160 return (-1);
1161 }
1163 if (ai_list == NULL)
1164 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1166 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1167 {
1168 ph->fd = -1;
1170 sockaddr_len = sizeof (sockaddr);
1171 memset (&sockaddr, '\0', sockaddr_len);
1173 if (ai_ptr->ai_family == AF_INET)
1174 {
1175 struct sockaddr_in *si;
1177 si = (struct sockaddr_in *) &sockaddr;
1178 si->sin_family = AF_INET;
1179 si->sin_port = htons (ph->ident);
1180 si->sin_addr.s_addr = htonl (INADDR_ANY);
1182 ai_ptr->ai_socktype = SOCK_RAW;
1183 ai_ptr->ai_protocol = IPPROTO_ICMP;
1184 }
1185 else if (ai_ptr->ai_family == AF_INET6)
1186 {
1187 struct sockaddr_in6 *si;
1189 si = (struct sockaddr_in6 *) &sockaddr;
1190 si->sin6_family = AF_INET6;
1191 si->sin6_port = htons (ph->ident);
1192 si->sin6_addr = in6addr_any;
1194 ai_ptr->ai_socktype = SOCK_RAW;
1195 ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1196 }
1197 else
1198 {
1199 char errmsg[PING_ERRMSG_LEN];
1201 snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1202 errmsg[PING_ERRMSG_LEN - 1] = '\0';
1204 dprintf (errmsg);
1205 ping_set_error (obj, "getaddrinfo", errmsg);
1206 continue;
1207 }
1209 /* TODO: Move this to a static function `ping_open_socket' and
1210 * call it whenever the socket dies. */
1211 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1212 if (ph->fd == -1)
1213 {
1214 #if WITH_DEBUG
1215 char errbuf[PING_ERRMSG_LEN];
1216 dprintf ("socket: %s\n",
1217 sstrerror (errno, errbuf, sizeof (errbuf)));
1218 #endif
1219 ping_set_errno (obj, "socket", errno);
1220 continue;
1221 }
1223 if (obj->srcaddr != NULL)
1224 {
1225 assert (obj->srcaddrlen > 0);
1226 assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1228 if (bind (ph->fd, (struct sockaddr *) obj->srcaddr, obj->srcaddrlen) == -1)
1229 {
1230 #if WITH_DEBUG
1231 char errbuf[PING_ERRMSG_LEN];
1232 dprintf ("bind: %s\n",
1233 sstrerror (errno, errbuf, sizeof (errbuf)));
1234 #endif
1235 ping_set_errno (obj, "bind", errno);
1236 close (ph->fd);
1237 ph->fd = -1;
1238 continue;
1239 }
1240 }
1242 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1243 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1244 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1245 ph->addrlen = ai_ptr->ai_addrlen;
1246 ph->addrfamily = ai_ptr->ai_family;
1248 #ifdef AI_CANONNAME
1249 if ((ai_ptr->ai_canonname != NULL)
1250 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1251 {
1252 char *old_hostname;
1254 dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1255 ph->hostname, ai_ptr->ai_canonname);
1257 old_hostname = ph->hostname;
1258 if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1259 {
1260 /* strdup failed, falling back to old hostname */
1261 ph->hostname = old_hostname;
1262 }
1263 else if (old_hostname != NULL)
1264 {
1265 free (old_hostname);
1266 }
1267 }
1268 #endif /* AI_CANONNAME */
1270 break;
1271 }
1273 freeaddrinfo (ai_list);
1275 if (ph->fd < 0)
1276 {
1277 ping_free (ph);
1278 return (-1);
1279 }
1281 /*
1282 * Adding in the front is much easier, but then the iterator will
1283 * return the host that was added last as first host. That's just not
1284 * nice. -octo
1285 */
1286 if (obj->head == NULL)
1287 {
1288 obj->head = ph;
1289 }
1290 else
1291 {
1292 pinghost_t *hptr;
1294 hptr = obj->head;
1295 while (hptr->next != NULL)
1296 hptr = hptr->next;
1298 assert ((hptr != NULL) && (hptr->next == NULL));
1299 hptr->next = ph;
1300 }
1302 ping_set_ttl (ph, obj->ttl);
1304 return (0);
1305 }
1307 int ping_host_remove (pingobj_t *obj, const char *host)
1308 {
1309 pinghost_t *pre, *cur;
1311 pre = NULL;
1312 cur = obj->head;
1314 while (cur != NULL)
1315 {
1316 if (strcasecmp (host, cur->username) == 0)
1317 break;
1319 pre = cur;
1320 cur = cur->next;
1321 }
1323 if (cur == NULL)
1324 {
1325 ping_set_error (obj, "ping_host_remove", "Host not found");
1326 return (-1);
1327 }
1329 if (pre == NULL)
1330 obj->head = cur->next;
1331 else
1332 pre->next = cur->next;
1334 ping_free (cur);
1336 return (0);
1337 }
1339 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1340 {
1341 return ((pingobj_iter_t *) obj->head);
1342 }
1344 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1345 {
1346 return ((pingobj_iter_t *) iter->next);
1347 }
1349 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1350 void *buffer, size_t *buffer_len)
1351 {
1352 int ret = EINVAL;
1354 size_t orig_buffer_len = *buffer_len;
1356 switch (info)
1357 {
1358 case PING_INFO_USERNAME:
1359 ret = ENOMEM;
1360 *buffer_len = strlen (iter->username) + 1;
1361 if (orig_buffer_len <= *buffer_len)
1362 break;
1363 /* Since (orig_buffer_len > *buffer_len) `strncpy'
1364 * will copy `*buffer_len' and pad the rest of
1365 * `buffer' with null-bytes */
1366 strncpy (buffer, iter->username, orig_buffer_len);
1367 ret = 0;
1368 break;
1370 case PING_INFO_HOSTNAME:
1371 ret = ENOMEM;
1372 *buffer_len = strlen (iter->hostname) + 1;
1373 if (orig_buffer_len < *buffer_len)
1374 break;
1375 /* Since (orig_buffer_len > *buffer_len) `strncpy'
1376 * will copy `*buffer_len' and pad the rest of
1377 * `buffer' with null-bytes */
1378 strncpy (buffer, iter->hostname, orig_buffer_len);
1379 ret = 0;
1380 break;
1382 case PING_INFO_ADDRESS:
1383 ret = getnameinfo ((struct sockaddr *) iter->addr,
1384 iter->addrlen,
1385 (char *) buffer,
1386 *buffer_len,
1387 NULL, 0,
1388 NI_NUMERICHOST);
1389 if (ret != 0)
1390 {
1391 if ((ret == EAI_MEMORY)
1392 #ifdef EAI_OVERFLOW
1393 || (ret == EAI_OVERFLOW)
1394 #endif
1395 )
1396 ret = ENOMEM;
1397 #if defined(EAI_SYSTEM)
1398 else if (ret == EAI_SYSTEM)
1399 ret = errno;
1400 #endif
1401 else
1402 ret = EINVAL;
1403 }
1404 break;
1406 case PING_INFO_FAMILY:
1407 ret = ENOMEM;
1408 *buffer_len = sizeof (int);
1409 if (orig_buffer_len < sizeof (int))
1410 break;
1411 *((int *) buffer) = iter->addrfamily;
1412 ret = 0;
1413 break;
1415 case PING_INFO_LATENCY:
1416 ret = ENOMEM;
1417 *buffer_len = sizeof (double);
1418 if (orig_buffer_len < sizeof (double))
1419 break;
1420 *((double *) buffer) = iter->latency;
1421 ret = 0;
1422 break;
1424 case PING_INFO_DROPPED:
1425 ret = ENOMEM;
1426 *buffer_len = sizeof (uint32_t);
1427 if (orig_buffer_len < sizeof (uint32_t))
1428 break;
1429 *((uint32_t *) buffer) = iter->dropped;
1430 ret = 0;
1431 break;
1433 case PING_INFO_SEQUENCE:
1434 ret = ENOMEM;
1435 *buffer_len = sizeof (unsigned int);
1436 if (orig_buffer_len < sizeof (unsigned int))
1437 break;
1438 *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1439 ret = 0;
1440 break;
1442 case PING_INFO_IDENT:
1443 ret = ENOMEM;
1444 *buffer_len = sizeof (uint16_t);
1445 if (orig_buffer_len < sizeof (uint16_t))
1446 break;
1447 *((uint16_t *) buffer) = (uint16_t) iter->ident;
1448 ret = 0;
1449 break;
1451 case PING_INFO_DATA:
1452 ret = ENOMEM;
1453 *buffer_len = strlen (iter->data);
1454 if (orig_buffer_len < *buffer_len)
1455 break;
1456 strncpy ((char *) buffer, iter->data, orig_buffer_len);
1457 ret = 0;
1458 break;
1459 }
1461 return (ret);
1462 } /* ping_iterator_get_info */
1464 void *ping_iterator_get_context (pingobj_iter_t *iter)
1465 {
1466 return (iter->context);
1467 }
1469 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1470 {
1471 iter->context = context;
1472 }