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 int recv_ttl;
116 char *data;
118 void *context;
120 struct pinghost *next;
121 };
123 struct pingobj
124 {
125 double timeout;
126 int ttl;
127 int addrfamily;
128 char *data;
130 struct sockaddr *srcaddr;
131 socklen_t srcaddrlen;
133 char errmsg[PING_ERRMSG_LEN];
135 pinghost_t *head;
136 };
138 /*
139 * private (static) functions
140 */
141 /* Even though Posix requires "strerror_r" to return an "int",
142 * some systems (e.g. the GNU libc) return a "char *" _and_
143 * ignore the second argument ... -tokkee */
144 char *sstrerror (int errnum, char *buf, size_t buflen)
145 {
146 buf[0] = 0;
148 #if !HAVE_STRERROR_R
149 {
150 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
151 }
152 /* #endif !HAVE_STRERROR_R */
154 #elif STRERROR_R_CHAR_P
155 {
156 char *temp;
157 temp = strerror_r (errnum, buf, buflen);
158 if (buf[0] == 0)
159 {
160 if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
161 strncpy (buf, temp, buflen);
162 else
163 strncpy (buf, "strerror_r did not return "
164 "an error message", buflen);
165 }
166 }
167 /* #endif STRERROR_R_CHAR_P */
169 #else
170 if (strerror_r (errnum, buf, buflen) != 0)
171 {
172 snprintf (buf, buflen, "Error %i (%#x); "
173 "Additionally, strerror_r failed.",
174 errnum, errnum);
175 }
176 #endif /* STRERROR_R_CHAR_P */
178 buf[buflen - 1] = 0;
180 return (buf);
181 } /* char *sstrerror */
183 static void ping_set_error (pingobj_t *obj, const char *function,
184 const char *message)
185 {
186 snprintf (obj->errmsg, sizeof (obj->errmsg),
187 "%s: %s", function, message);
188 obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
189 }
191 static void ping_set_errno (pingobj_t *obj, 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 struct timeval diff;
427 pinghost_t *host = NULL;
428 int family;
429 int recv_ttl;
431 /*
432 * Set up the receive buffer..
433 */
434 struct msghdr msghdr;
435 struct cmsghdr *cmsg;
436 char payload_buffer[4096];
437 ssize_t payload_buffer_len;
438 char control_buffer[4096];
439 struct iovec payload_iovec;
441 memset (&payload_iovec, 0, sizeof (payload_iovec));
442 payload_iovec.iov_base = payload_buffer;
443 payload_iovec.iov_len = sizeof (payload_buffer);
445 memset (&msghdr, 0, sizeof (msghdr));
446 /* unspecified source address */
447 msghdr.msg_name = NULL;
448 msghdr.msg_namelen = 0;
449 /* output buffer vector, see readv(2) */
450 msghdr.msg_iov = &payload_iovec;
451 msghdr.msg_iovlen = 1;
452 /* output buffer for control messages */
453 msghdr.msg_control = control_buffer;
454 msghdr.msg_controllen = sizeof (control_buffer);
455 /* flags; this is an output only field.. */
456 msghdr.msg_flags = 0;
457 #ifdef MSG_XPG4_2
458 msghdr.msg_flags |= MSG_XPG4_2;
459 #endif
461 payload_buffer_len = recvmsg (fd, &msghdr, /* flags = */ 0);
462 if (payload_buffer_len < 0)
463 {
464 #if WITH_DEBUG
465 char errbuf[PING_ERRMSG_LEN];
466 dprintf ("recvfrom: %s\n",
467 sstrerror (errno, errbuf, sizeof (errbuf)));
468 #endif
469 return (-1);
470 }
471 dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, fd);
473 /* Iterate over all auxiliary data in msghdr */
474 family = -1;
475 recv_ttl = -1;
476 for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
477 cmsg != NULL;
478 cmsg = CMSG_NXTHDR (&msghdr, cmsg))
479 {
480 if (cmsg->cmsg_level == IPPROTO_IP) /* {{{ */
481 {
482 family = AF_INET;
483 if (cmsg->cmsg_type == IP_TTL)
484 {
485 memcpy (&recv_ttl, CMSG_DATA (cmsg),
486 sizeof (recv_ttl));
487 dprintf ("TTLv4 = %i;\n", recv_ttl);
488 }
489 else
490 {
491 dprintf ("Not handling option %i.\n",
492 cmsg->cmsg_type);
493 }
494 } /* }}} */
495 else if (cmsg->cmsg_level == IPPROTO_IPV6) /* {{{ */
496 {
497 family = AF_INET6;
498 if (cmsg->cmsg_type == IPV6_HOPLIMIT)
499 {
500 memcpy (&recv_ttl, CMSG_DATA (cmsg),
501 sizeof (recv_ttl));
502 dprintf ("TTLv6 = %i;\n", recv_ttl);
503 }
504 else
505 {
506 dprintf ("Not handling option %i.\n",
507 cmsg->cmsg_type);
508 }
509 } /* }}} */
510 else
511 {
512 dprintf ("Don't know how to handle "
513 "unknown protocol %i.\n",
514 cmsg->cmsg_level);
515 }
516 } /* }}} for (cmsg) */
518 if (family == AF_INET)
519 {
520 host = ping_receive_ipv4 (ph, payload_buffer, payload_buffer_len);
521 if (host == NULL)
522 return (-1);
523 }
524 else if (family == AF_INET6)
525 {
526 host = ping_receive_ipv6 (ph, payload_buffer, payload_buffer_len);
527 if (host == NULL)
528 return (-1);
529 }
530 else
531 {
532 dprintf ("ping_receive_one: Unknown address family %i.\n",
533 family);
534 return (-1);
535 }
537 dprintf ("rcvd: %12i.%06i\n",
538 (int) now->tv_sec,
539 (int) now->tv_usec);
540 dprintf ("sent: %12i.%06i\n",
541 (int) host->timer->tv_sec,
542 (int) host->timer->tv_usec);
544 if (ping_timeval_sub (now, host->timer, &diff) < 0)
545 {
546 timerclear (host->timer);
547 return (-1);
548 }
550 dprintf ("diff: %12i.%06i\n",
551 (int) diff.tv_sec,
552 (int) diff.tv_usec);
554 host->latency = ((double) diff.tv_usec) / 1000.0;
555 host->latency += ((double) diff.tv_sec) * 1000.0;
557 host->recv_ttl = recv_ttl;
559 timerclear (host->timer);
561 return (0);
562 }
564 static int ping_receive_all (pingobj_t *obj)
565 {
566 fd_set readfds;
567 int num_readfds;
568 int max_readfds;
570 pinghost_t *ph;
571 pinghost_t *ptr;
573 struct timeval endtime;
574 struct timeval nowtime;
575 struct timeval timeout;
576 int status;
578 int ret;
580 ph = obj->head;
581 ret = 0;
583 for (ptr = ph; ptr != NULL; ptr = ptr->next)
584 ptr->latency = -1.0;
586 if (gettimeofday (&nowtime, NULL) == -1)
587 {
588 ping_set_errno (obj, errno);
589 return (-1);
590 }
592 /* Set up timeout */
593 timeout.tv_sec = (time_t) obj->timeout;
594 timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
596 dprintf ("Set timeout to %i.%06i seconds\n",
597 (int) timeout.tv_sec,
598 (int) timeout.tv_usec);
600 ping_timeval_add (&nowtime, &timeout, &endtime);
602 while (1)
603 {
604 FD_ZERO (&readfds);
605 num_readfds = 0;
606 max_readfds = -1;
608 for (ptr = ph; ptr != NULL; ptr = ptr->next)
609 {
610 if (!timerisset (ptr->timer))
611 continue;
613 FD_SET (ptr->fd, &readfds);
614 num_readfds++;
616 if (max_readfds < ptr->fd)
617 max_readfds = ptr->fd;
618 }
620 if (num_readfds == 0)
621 break;
623 if (gettimeofday (&nowtime, NULL) == -1)
624 {
625 ping_set_errno (obj, errno);
626 return (-1);
627 }
629 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
630 break;
632 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
633 (int) timeout.tv_sec,
634 (int) timeout.tv_usec);
636 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
638 if (gettimeofday (&nowtime, NULL) == -1)
639 {
640 ping_set_errno (obj, errno);
641 return (-1);
642 }
644 if ((status == -1) && (errno == EINTR))
645 {
646 dprintf ("select was interrupted by signal..\n");
647 continue;
648 }
649 else if (status < 0)
650 {
651 #if WITH_DEBUG
652 char errbuf[PING_ERRMSG_LEN];
653 dprintf ("select: %s\n",
654 sstrerror (errno, errbuf, sizeof (errbuf)));
655 #endif
656 break;
657 }
658 else if (status == 0)
659 {
660 dprintf ("select timed out\n");
661 for (ptr = ph; ptr != NULL; ptr = ptr->next)
662 if (ptr->latency < 0.0)
663 ptr->dropped++;
664 break;
665 }
667 for (ptr = ph; ptr != NULL; ptr = ptr->next)
668 {
669 if (FD_ISSET (ptr->fd, &readfds))
670 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
671 ret++;
672 }
673 } /* while (1) */
675 return (ret);
676 }
678 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
679 * Sending functions: *
680 * *
681 * ping_send_all *
682 * +-> ping_send_one_ipv4 *
683 * `-> ping_send_one_ipv6 *
684 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
685 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
686 const void *buf, size_t buflen)
687 {
688 ssize_t ret;
690 if (gettimeofday (ph->timer, NULL) == -1)
691 {
692 timerclear (ph->timer);
693 return (-1);
694 }
696 ret = sendto (ph->fd, buf, buflen, 0,
697 (struct sockaddr *) ph->addr, ph->addrlen);
699 if (ret < 0)
700 {
701 #if defined(EHOSTUNREACH)
702 if (errno == EHOSTUNREACH)
703 return (0);
704 #endif
705 #if defined(ENETUNREACH)
706 if (errno == ENETUNREACH)
707 return (0);
708 #endif
709 ping_set_errno (obj, errno);
710 }
712 return (ret);
713 }
715 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
716 {
717 struct icmp *icmp4;
718 int status;
720 char buf[4096];
721 int buflen;
723 char *data;
724 int datalen;
726 dprintf ("ph->hostname = %s\n", ph->hostname);
728 memset (buf, '\0', sizeof (buf));
729 icmp4 = (struct icmp *) buf;
730 data = (char *) (icmp4 + 1);
732 icmp4->icmp_type = ICMP_ECHO;
733 icmp4->icmp_code = 0;
734 icmp4->icmp_cksum = 0;
735 icmp4->icmp_id = htons (ph->ident);
736 icmp4->icmp_seq = htons (ph->sequence);
738 buflen = 4096 - sizeof (struct icmp);
739 strncpy (data, ph->data, buflen);
740 datalen = strlen (data);
742 buflen = datalen + sizeof (struct icmp);
744 icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
746 dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
748 status = ping_sendto (obj, ph, buf, buflen);
749 if (status < 0)
750 {
751 perror ("ping_sendto");
752 return (-1);
753 }
755 dprintf ("sendto: status = %i\n", status);
757 return (0);
758 }
760 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
761 {
762 struct icmp6_hdr *icmp6;
763 int status;
765 char buf[4096];
766 int buflen;
768 char *data;
769 int datalen;
771 dprintf ("ph->hostname = %s\n", ph->hostname);
773 memset (buf, '\0', sizeof (buf));
774 icmp6 = (struct icmp6_hdr *) buf;
775 data = (char *) (icmp6 + 1);
777 icmp6->icmp6_type = ICMP6_ECHO_REQUEST;
778 icmp6->icmp6_code = 0;
779 /* The checksum will be calculated by the TCP/IP stack. */
780 /* FIXME */
781 icmp6->icmp6_cksum = 0;
782 icmp6->icmp6_id = htons (ph->ident);
783 icmp6->icmp6_seq = htons (ph->sequence);
785 buflen = 4096 - sizeof (struct icmp6_hdr);
786 strncpy (data, ph->data, buflen);
787 datalen = strlen (data);
789 buflen = datalen + sizeof (struct icmp6_hdr);
791 dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
793 status = ping_sendto (obj, ph, buf, buflen);
794 if (status < 0)
795 {
796 perror ("ping_sendto");
797 return (-1);
798 }
800 dprintf ("sendto: status = %i\n", status);
802 return (0);
803 }
805 static int ping_send_all (pingobj_t *obj)
806 {
807 pinghost_t *ph;
808 pinghost_t *ptr;
810 int ret;
812 ret = 0;
813 ph = obj->head;
815 for (ptr = ph; ptr != NULL; ptr = ptr->next)
816 {
817 /* start timer.. The GNU `ping6' starts the timer before
818 * sending the packet, so I will do that too */
819 if (gettimeofday (ptr->timer, NULL) == -1)
820 {
821 #if WITH_DEBUG
822 char errbuf[PING_ERRMSG_LEN];
823 dprintf ("gettimeofday: %s\n",
824 sstrerror (errno, errbuf, sizeof (errbuf)));
825 #endif
826 timerclear (ptr->timer);
827 ret--;
828 continue;
829 }
830 else
831 {
832 dprintf ("timer set for hostname = %s\n", ptr->hostname);
833 }
835 if (ptr->addrfamily == AF_INET6)
836 {
837 dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
838 if (ping_send_one_ipv6 (obj, ptr) != 0)
839 {
840 timerclear (ptr->timer);
841 ret--;
842 continue;
843 }
844 }
845 else if (ptr->addrfamily == AF_INET)
846 {
847 dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
848 if (ping_send_one_ipv4 (obj, ptr) != 0)
849 {
850 timerclear (ptr->timer);
851 ret--;
852 continue;
853 }
854 }
855 else /* this should not happen */
856 {
857 dprintf ("Unknown address family: %i\n", ptr->addrfamily);
858 timerclear (ptr->timer);
859 ret--;
860 continue;
861 }
863 ptr->sequence++;
864 }
866 return (ret);
867 }
869 /*
870 * Set the TTL of a socket protocol independently.
871 */
872 static int ping_set_ttl (pinghost_t *ph, int ttl)
873 {
874 int ret = -2;
876 if (ph->addrfamily == AF_INET)
877 {
878 dprintf ("Setting TTLv4 to %i\n", ttl);
879 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
880 &ttl, sizeof (ttl));
881 }
882 else if (ph->addrfamily == AF_INET6)
883 {
884 dprintf ("Setting TTLv6 to %i\n", ttl);
885 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
886 &ttl, sizeof (ttl));
887 }
889 return (ret);
890 }
892 static int ping_get_ident (void)
893 {
894 int fd;
895 static int did_seed = 0;
897 int retval;
899 if (did_seed == 0)
900 {
901 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
902 {
903 unsigned int seed;
905 if (read (fd, &seed, sizeof (seed)) != -1)
906 {
907 did_seed = 1;
908 dprintf ("Random seed: %#x\n", seed);
909 srandom (seed);
910 }
912 close (fd);
913 }
914 #if WITH_DEBUG
915 else
916 {
917 char errbuf[PING_ERRMSG_LEN];
918 dprintf ("open (/dev/urandom): %s\n",
919 sstrerror (errno, errbuf, sizeof (errbuf)));
920 }
921 #endif
922 }
924 retval = (int) random ();
926 dprintf ("Random number: %#x\n", retval);
928 return (retval);
929 }
931 static pinghost_t *ping_alloc (void)
932 {
933 pinghost_t *ph;
934 size_t ph_size;
936 ph_size = sizeof (pinghost_t)
937 + sizeof (struct sockaddr_storage)
938 + sizeof (struct timeval);
940 ph = (pinghost_t *) malloc (ph_size);
941 if (ph == NULL)
942 return (NULL);
944 memset (ph, '\0', ph_size);
946 ph->timer = (struct timeval *) (ph + 1);
947 ph->addr = (struct sockaddr_storage *) (ph->timer + 1);
949 ph->addrlen = sizeof (struct sockaddr_storage);
950 ph->fd = -1;
951 ph->latency = -1.0;
952 ph->dropped = 0;
953 ph->ident = ping_get_ident () & 0xFFFF;
955 return (ph);
956 }
958 static void ping_free (pinghost_t *ph)
959 {
960 if (ph->fd >= 0)
961 close (ph->fd);
963 if (ph->username != NULL)
964 free (ph->username);
966 if (ph->hostname != NULL)
967 free (ph->hostname);
969 if (ph->data != NULL)
970 free (ph->data);
972 free (ph);
973 }
975 /*
976 * public methods
977 */
978 const char *ping_get_error (pingobj_t *obj)
979 {
980 return (obj->errmsg);
981 }
983 pingobj_t *ping_construct (void)
984 {
985 pingobj_t *obj;
987 if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
988 return (NULL);
989 memset (obj, '\0', sizeof (pingobj_t));
991 obj->timeout = PING_DEF_TIMEOUT;
992 obj->ttl = PING_DEF_TTL;
993 obj->addrfamily = PING_DEF_AF;
994 obj->data = strdup (PING_DEF_DATA);
996 return (obj);
997 }
999 void ping_destroy (pingobj_t *obj)
1000 {
1001 pinghost_t *current;
1002 pinghost_t *next;
1004 current = obj->head;
1005 next = NULL;
1007 while (current != NULL)
1008 {
1009 next = current->next;
1010 ping_free (current);
1011 current = next;
1012 }
1014 if (obj->data != NULL)
1015 free (obj->data);
1017 if (obj->srcaddr != NULL)
1018 free (obj->srcaddr);
1020 free (obj);
1022 return;
1023 }
1025 int ping_setopt (pingobj_t *obj, int option, void *value)
1026 {
1027 int ret = 0;
1029 switch (option)
1030 {
1031 case PING_OPT_TIMEOUT:
1032 obj->timeout = *((double *) value);
1033 if (obj->timeout < 0.0)
1034 {
1035 obj->timeout = PING_DEF_TIMEOUT;
1036 ret = -1;
1037 }
1038 break;
1040 case PING_OPT_TTL:
1041 obj->ttl = *((int *) value);
1042 if ((obj->ttl < 1) || (obj->ttl > 255))
1043 {
1044 obj->ttl = PING_DEF_TTL;
1045 ret = -1;
1046 }
1047 else
1048 {
1049 pinghost_t *ph;
1051 for (ph = obj->head; ph != NULL; ph = ph->next)
1052 ping_set_ttl (ph, obj->ttl);
1053 }
1054 break;
1056 case PING_OPT_AF:
1057 obj->addrfamily = *((int *) value);
1058 if ((obj->addrfamily != AF_UNSPEC)
1059 && (obj->addrfamily != AF_INET)
1060 && (obj->addrfamily != AF_INET6))
1061 {
1062 obj->addrfamily = PING_DEF_AF;
1063 ret = -1;
1064 }
1065 if (obj->srcaddr != NULL)
1066 {
1067 free (obj->srcaddr);
1068 obj->srcaddr = NULL;
1069 }
1070 break;
1072 case PING_OPT_DATA:
1073 if (obj->data != NULL)
1074 {
1075 free (obj->data);
1076 obj->data = NULL;
1077 }
1078 obj->data = strdup ((const char *) value);
1079 break;
1081 case PING_OPT_SOURCE:
1082 {
1083 char *hostname = (char *) value;
1084 struct addrinfo ai_hints;
1085 struct addrinfo *ai_list;
1086 int status;
1087 #if WITH_DEBUG
1088 if (obj->addrfamily != AF_UNSPEC)
1089 {
1090 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1091 }
1092 #endif
1093 memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1094 ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1095 #if defined(AI_ADDRCONFIG)
1096 ai_hints.ai_flags = AI_ADDRCONFIG;
1097 #endif
1098 status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1099 if (status != 0)
1100 {
1101 #if defined(EAI_SYSTEM)
1102 char errbuf[PING_ERRMSG_LEN];
1103 #endif
1104 ping_set_error (obj, "getaddrinfo",
1105 #if defined(EAI_SYSTEM)
1106 (status == EAI_SYSTEM)
1107 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1108 #endif
1109 gai_strerror (status));
1110 ret = -1;
1111 break;
1112 }
1113 #if WITH_DEBUG
1114 if (ai_list->ai_next != NULL)
1115 {
1116 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1117 }
1118 #endif
1119 if (obj->srcaddr == NULL)
1120 {
1121 obj->srcaddrlen = 0;
1122 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1123 if (obj->srcaddr == NULL)
1124 {
1125 ping_set_errno (obj, errno);
1126 ret = -1;
1127 freeaddrinfo (ai_list);
1128 break;
1129 }
1130 }
1131 memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1132 assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1133 memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1134 ai_list->ai_addrlen);
1135 obj->srcaddrlen = ai_list->ai_addrlen;
1136 obj->addrfamily = ai_list->ai_family;
1138 freeaddrinfo (ai_list);
1139 } /* case PING_OPT_SOURCE */
1140 break;
1142 default:
1143 ret = -2;
1144 } /* switch (option) */
1146 return (ret);
1147 } /* int ping_setopt */
1150 int ping_send (pingobj_t *obj)
1151 {
1152 int ret;
1154 if (ping_send_all (obj) < 0)
1155 return (-1);
1157 if ((ret = ping_receive_all (obj)) < 0)
1158 return (-2);
1160 return (ret);
1161 }
1163 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1164 {
1165 while (ph != NULL)
1166 {
1167 if (strcasecmp (ph->username, host) == 0)
1168 break;
1170 ph = ph->next;
1171 }
1173 return (ph);
1174 }
1176 int ping_host_add (pingobj_t *obj, const char *host)
1177 {
1178 pinghost_t *ph;
1180 struct addrinfo ai_hints;
1181 struct addrinfo *ai_list, *ai_ptr;
1182 int ai_return;
1184 dprintf ("host = %s\n", host);
1186 if (ping_host_search (obj->head, host) != NULL)
1187 return (0);
1189 memset (&ai_hints, '\0', sizeof (ai_hints));
1190 ai_hints.ai_flags = 0;
1191 #ifdef AI_ADDRCONFIG
1192 ai_hints.ai_flags |= AI_ADDRCONFIG;
1193 #endif
1194 #ifdef AI_CANONNAME
1195 ai_hints.ai_flags |= AI_CANONNAME;
1196 #endif
1197 ai_hints.ai_family = obj->addrfamily;
1198 ai_hints.ai_socktype = SOCK_RAW;
1200 if ((ph = ping_alloc ()) == NULL)
1201 {
1202 dprintf ("Out of memory!\n");
1203 return (-1);
1204 }
1206 if ((ph->username = strdup (host)) == NULL)
1207 {
1208 dprintf ("Out of memory!\n");
1209 ping_set_errno (obj, errno);
1210 ping_free (ph);
1211 return (-1);
1212 }
1214 if ((ph->hostname = strdup (host)) == NULL)
1215 {
1216 dprintf ("Out of memory!\n");
1217 ping_set_errno (obj, errno);
1218 ping_free (ph);
1219 return (-1);
1220 }
1222 /* obj->data is not garuanteed to be != NULL */
1223 if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1224 {
1225 dprintf ("Out of memory!\n");
1226 ping_set_errno (obj, errno);
1227 ping_free (ph);
1228 return (-1);
1229 }
1231 if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1232 {
1233 #if defined(EAI_SYSTEM)
1234 char errbuf[PING_ERRMSG_LEN];
1235 #endif
1236 dprintf ("getaddrinfo failed\n");
1237 ping_set_error (obj, "getaddrinfo",
1238 #if defined(EAI_SYSTEM)
1239 (ai_return == EAI_SYSTEM)
1240 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1241 #endif
1242 gai_strerror (ai_return));
1243 ping_free (ph);
1244 return (-1);
1245 }
1247 if (ai_list == NULL)
1248 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1250 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1251 {
1252 ph->fd = -1;
1254 if (ai_ptr->ai_family == AF_INET)
1255 {
1256 ai_ptr->ai_socktype = SOCK_RAW;
1257 ai_ptr->ai_protocol = IPPROTO_ICMP;
1258 }
1259 else if (ai_ptr->ai_family == AF_INET6)
1260 {
1261 ai_ptr->ai_socktype = SOCK_RAW;
1262 ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1263 }
1264 else
1265 {
1266 char errmsg[PING_ERRMSG_LEN];
1268 snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1269 errmsg[PING_ERRMSG_LEN - 1] = '\0';
1271 dprintf (errmsg);
1272 ping_set_error (obj, "getaddrinfo", errmsg);
1273 continue;
1274 }
1276 /* TODO: Move this to a static function `ping_open_socket' and
1277 * call it whenever the socket dies. */
1278 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1279 if (ph->fd == -1)
1280 {
1281 #if WITH_DEBUG
1282 char errbuf[PING_ERRMSG_LEN];
1283 dprintf ("socket: %s\n",
1284 sstrerror (errno, errbuf, sizeof (errbuf)));
1285 #endif
1286 ping_set_errno (obj, errno);
1287 continue;
1288 }
1290 if (obj->srcaddr != NULL)
1291 {
1292 assert (obj->srcaddrlen > 0);
1293 assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1295 if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1296 {
1297 #if WITH_DEBUG
1298 char errbuf[PING_ERRMSG_LEN];
1299 dprintf ("bind: %s\n",
1300 sstrerror (errno, errbuf, sizeof (errbuf)));
1301 #endif
1302 ping_set_errno (obj, errno);
1303 close (ph->fd);
1304 ph->fd = -1;
1305 continue;
1306 }
1307 }
1309 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1310 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1311 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1312 ph->addrlen = ai_ptr->ai_addrlen;
1313 ph->addrfamily = ai_ptr->ai_family;
1315 #ifdef AI_CANONNAME
1316 if ((ai_ptr->ai_canonname != NULL)
1317 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1318 {
1319 char *old_hostname;
1321 dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1322 ph->hostname, ai_ptr->ai_canonname);
1324 old_hostname = ph->hostname;
1325 if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1326 {
1327 /* strdup failed, falling back to old hostname */
1328 ph->hostname = old_hostname;
1329 }
1330 else if (old_hostname != NULL)
1331 {
1332 free (old_hostname);
1333 }
1334 }
1335 #endif /* AI_CANONNAME */
1337 if (ph->addrfamily == AF_INET)
1338 {
1339 int opt = 1;
1341 setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1342 &opt, sizeof (opt));
1343 }
1344 else if (ph->addrfamily == AF_INET6)
1345 {
1346 int opt = 1;
1348 setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1349 &opt, sizeof (opt));
1350 }
1352 break;
1353 }
1355 freeaddrinfo (ai_list);
1357 if (ph->fd < 0)
1358 {
1359 ping_free (ph);
1360 return (-1);
1361 }
1363 /*
1364 * Adding in the front is much easier, but then the iterator will
1365 * return the host that was added last as first host. That's just not
1366 * nice. -octo
1367 */
1368 if (obj->head == NULL)
1369 {
1370 obj->head = ph;
1371 }
1372 else
1373 {
1374 pinghost_t *hptr;
1376 hptr = obj->head;
1377 while (hptr->next != NULL)
1378 hptr = hptr->next;
1380 assert ((hptr != NULL) && (hptr->next == NULL));
1381 hptr->next = ph;
1382 }
1384 ping_set_ttl (ph, obj->ttl);
1386 return (0);
1387 } /* int ping_host_add */
1389 int ping_host_remove (pingobj_t *obj, const char *host)
1390 {
1391 pinghost_t *pre, *cur;
1393 pre = NULL;
1394 cur = obj->head;
1396 while (cur != NULL)
1397 {
1398 if (strcasecmp (host, cur->username) == 0)
1399 break;
1401 pre = cur;
1402 cur = cur->next;
1403 }
1405 if (cur == NULL)
1406 {
1407 ping_set_error (obj, "ping_host_remove", "Host not found");
1408 return (-1);
1409 }
1411 if (pre == NULL)
1412 obj->head = cur->next;
1413 else
1414 pre->next = cur->next;
1416 ping_free (cur);
1418 return (0);
1419 }
1421 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1422 {
1423 return ((pingobj_iter_t *) obj->head);
1424 }
1426 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1427 {
1428 return ((pingobj_iter_t *) iter->next);
1429 }
1431 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1432 void *buffer, size_t *buffer_len)
1433 {
1434 int ret = EINVAL;
1436 size_t orig_buffer_len = *buffer_len;
1438 switch (info)
1439 {
1440 case PING_INFO_USERNAME:
1441 ret = ENOMEM;
1442 *buffer_len = strlen (iter->username) + 1;
1443 if (orig_buffer_len <= *buffer_len)
1444 break;
1445 /* Since (orig_buffer_len > *buffer_len) `strncpy'
1446 * will copy `*buffer_len' and pad the rest of
1447 * `buffer' with null-bytes */
1448 strncpy (buffer, iter->username, orig_buffer_len);
1449 ret = 0;
1450 break;
1452 case PING_INFO_HOSTNAME:
1453 ret = ENOMEM;
1454 *buffer_len = strlen (iter->hostname) + 1;
1455 if (orig_buffer_len < *buffer_len)
1456 break;
1457 /* Since (orig_buffer_len > *buffer_len) `strncpy'
1458 * will copy `*buffer_len' and pad the rest of
1459 * `buffer' with null-bytes */
1460 strncpy (buffer, iter->hostname, orig_buffer_len);
1461 ret = 0;
1462 break;
1464 case PING_INFO_ADDRESS:
1465 ret = getnameinfo ((struct sockaddr *) iter->addr,
1466 iter->addrlen,
1467 (char *) buffer,
1468 *buffer_len,
1469 NULL, 0,
1470 NI_NUMERICHOST);
1471 if (ret != 0)
1472 {
1473 if ((ret == EAI_MEMORY)
1474 #ifdef EAI_OVERFLOW
1475 || (ret == EAI_OVERFLOW)
1476 #endif
1477 )
1478 ret = ENOMEM;
1479 #if defined(EAI_SYSTEM)
1480 else if (ret == EAI_SYSTEM)
1481 ret = errno;
1482 #endif
1483 else
1484 ret = EINVAL;
1485 }
1486 break;
1488 case PING_INFO_FAMILY:
1489 ret = ENOMEM;
1490 *buffer_len = sizeof (int);
1491 if (orig_buffer_len < sizeof (int))
1492 break;
1493 *((int *) buffer) = iter->addrfamily;
1494 ret = 0;
1495 break;
1497 case PING_INFO_LATENCY:
1498 ret = ENOMEM;
1499 *buffer_len = sizeof (double);
1500 if (orig_buffer_len < sizeof (double))
1501 break;
1502 *((double *) buffer) = iter->latency;
1503 ret = 0;
1504 break;
1506 case PING_INFO_DROPPED:
1507 ret = ENOMEM;
1508 *buffer_len = sizeof (uint32_t);
1509 if (orig_buffer_len < sizeof (uint32_t))
1510 break;
1511 *((uint32_t *) buffer) = iter->dropped;
1512 ret = 0;
1513 break;
1515 case PING_INFO_SEQUENCE:
1516 ret = ENOMEM;
1517 *buffer_len = sizeof (unsigned int);
1518 if (orig_buffer_len < sizeof (unsigned int))
1519 break;
1520 *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1521 ret = 0;
1522 break;
1524 case PING_INFO_IDENT:
1525 ret = ENOMEM;
1526 *buffer_len = sizeof (uint16_t);
1527 if (orig_buffer_len < sizeof (uint16_t))
1528 break;
1529 *((uint16_t *) buffer) = (uint16_t) iter->ident;
1530 ret = 0;
1531 break;
1533 case PING_INFO_DATA:
1534 ret = ENOMEM;
1535 *buffer_len = strlen (iter->data);
1536 if (orig_buffer_len < *buffer_len)
1537 break;
1538 strncpy ((char *) buffer, iter->data, orig_buffer_len);
1539 ret = 0;
1540 break;
1542 case PING_INFO_RECV_TTL:
1543 ret = ENOMEM;
1544 *buffer_len = sizeof (int);
1545 if (orig_buffer_len < sizeof (int))
1546 break;
1547 *((int *) buffer) = iter->recv_ttl;
1548 ret = 0;
1549 break;
1550 }
1552 return (ret);
1553 } /* ping_iterator_get_info */
1555 void *ping_iterator_get_context (pingobj_iter_t *iter)
1556 {
1557 return (iter->context);
1558 }
1560 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1561 {
1562 iter->context = context;
1563 }