Code

liboping.c: Catch `EHOSTUNREACH' and `ENETUNREACH'
[liboping.git] / src / liboping.c
1 /**
2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
3  * Copyright (C) 2006  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; either version 2 of the License, or
8  * (at your option) any later version.
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 <errno.h>
29 # include <assert.h>
30 #else
31 # error "You don't have the standard C99 header files installed"
32 #endif /* STDC_HEADERS */
34 #if HAVE_UNISTD_H
35 # include <unistd.h>
36 #endif
38 #if HAVE_FCNTL_H
39 # include <fcntl.h>
40 #endif
41 #if HAVE_SYS_TYPES_H
42 # include <sys/types.h>
43 #endif
44 #if HAVE_SYS_STAT_H
45 # include <sys/stat.h>
46 #endif
48 #if TIME_WITH_SYS_TIME
49 # include <sys/time.h>
50 # include <time.h>
51 #else
52 # if HAVE_SYS_TIME_H
53 #  include <sys/time.h>
54 # else
55 #  include <time.h>
56 # endif
57 #endif
59 #if HAVE_SYS_SOCKET_H
60 # include <sys/socket.h>
61 #endif
62 #if HAVE_NETDB_H
63 # include <netdb.h>
64 #endif
66 #if HAVE_NETINET_IN_SYSTM_H
67 # include <netinet/in_systm.h>
68 #endif
69 #if HAVE_NETINET_IN_H
70 # include <netinet/in.h>
71 #endif
72 #if HAVE_NETINET_IP_H
73 # include <netinet/ip.h>
74 #endif
75 #if HAVE_NETINET_IP_ICMP_H
76 # include <netinet/ip_icmp.h>
77 #endif
78 #ifdef HAVE_NETINET_IP_VAR_H
79 # include <netinet/ip_var.h>
80 #endif
81 #if HAVE_NETINET_IP6_H
82 # include <netinet/ip6.h>
83 #endif
84 #if HAVE_NETINET_ICMP6_H
85 # include <netinet/icmp6.h>
86 #endif
88 #include "oping.h"
90 #if WITH_DEBUG
91 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
92 #else
93 # define dprintf(...) /**/
94 #endif
96 #define PING_ERRMSG_LEN 256
98 struct pinghost
99 {
100         char                    *hostname;
101         struct sockaddr_storage *addr;
102         socklen_t                addrlen;
103         int                      addrfamily;
104         int                      fd;
105         int                      ident;
106         int                      sequence;
107         struct timeval          *timer;
108         double                   latency;
109         char                    *data;
111         void                    *context;
113         struct pinghost         *next;
114 };
116 struct pingobj
118         double      timeout;
119         int         ttl;
120         int         addrfamily;
121         char       *data;
123         char        errmsg[PING_ERRMSG_LEN];
125         pinghost_t *head;
126 };
128 /*
129  * private (static) functions
130  */
131 static void ping_set_error (pingobj_t *obj, const char *function,
132                 const char *message)
134         snprintf (obj->errmsg, PING_ERRMSG_LEN, "%s: %s", function, message);
135         obj->errmsg[PING_ERRMSG_LEN - 1] = '\0';
138 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
139                 struct timeval *res)
141         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
142         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
144         while (res->tv_usec > 1000000)
145         {
146                 res->tv_usec -= 1000000;
147                 res->tv_sec++;
148         }
150         return (0);
153 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
154                 struct timeval *res)
157         if ((tv1->tv_sec < tv2->tv_sec)
158                         || ((tv1->tv_sec == tv2->tv_sec)
159                                 && (tv1->tv_usec < tv2->tv_usec)))
160                 return (-1);
162         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
163         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
165         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec > 0)));
167         while (res->tv_usec < 0)
168         {
169                 res->tv_usec += 1000000;
170                 res->tv_sec--;
171         }
173         return (0);
176 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
178         uint32_t sum = 0;
179         uint16_t ret = 0;
181         uint16_t *ptr;
183         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
184                 sum += *ptr;
186         if (len == 1)
187         {
188                 *(char *) &ret = *(char *) ptr;
189                 sum += ret;
190         }
192         /* Do this twice to get all possible carries.. */
193         sum = (sum >> 16) + (sum & 0xFFFF);
194         sum = (sum >> 16) + (sum & 0xFFFF);
196         ret = ~sum;
198         return (ret);
201 static pinghost_t *ping_receive_ipv4 (pinghost_t *ph, char *buffer, size_t buffer_len)
203         struct ip *ip_hdr;
204         struct icmp *icmp_hdr;
206         size_t ip_hdr_len;
208         uint16_t recv_checksum;
209         uint16_t calc_checksum;
211         uint16_t ident;
212         uint16_t seq;
214         pinghost_t *ptr;
216         if (buffer_len < sizeof (struct ip))
217                 return (NULL);
219         ip_hdr     = (struct ip *) buffer;
220         ip_hdr_len = ip_hdr->ip_hl << 2;
222         if (buffer_len < ip_hdr_len)
223                 return (NULL);
225         buffer     += ip_hdr_len;
226         buffer_len -= ip_hdr_len;
228         if (buffer_len < sizeof (struct icmp))
229                 return (NULL);
231         icmp_hdr = (struct icmp *) buffer;
232         buffer     += sizeof (struct icmp);
233         buffer_len -= sizeof (struct icmp);
235         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
236         {
237                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
238                 return (NULL);
239         }
241         recv_checksum = icmp_hdr->icmp_cksum;
242         icmp_hdr->icmp_cksum = 0;
243         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
244                         sizeof (struct icmp) + buffer_len);
246         if (recv_checksum != calc_checksum)
247         {
248                 dprintf ("Checksum missmatch: Got 0x%04x, calculated 0x%04x\n",
249                                 recv_checksum, calc_checksum);
250                 return (NULL);
251         }
253         ident = ntohs (icmp_hdr->icmp_id);
254         seq   = ntohs (icmp_hdr->icmp_seq);
256         for (ptr = ph; ptr != NULL; ptr = ptr->next)
257         {
258                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
259                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
261                 if (ptr->addrfamily != AF_INET)
262                         continue;
264                 if (!timerisset (ptr->timer))
265                         continue;
267                 if (ptr->ident != ident)
268                         continue;
270                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
271                         continue;
273                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
274                                 ptr->hostname, ident, seq);
276                 break;
277         }
279         if (ptr == NULL)
280         {
281                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
282                                 ident, seq);
283         }
285         return (ptr);
288 static pinghost_t *ping_receive_ipv6 (pinghost_t *ph, char *buffer, size_t buffer_len)
290         struct icmp6_hdr *icmp_hdr;
292         uint16_t ident;
293         uint16_t seq;
295         pinghost_t *ptr;
297         if (buffer_len < sizeof (struct icmp6_hdr))
298                 return (NULL);
300         icmp_hdr = (struct icmp6_hdr *) buffer;
301         buffer     += sizeof (struct icmp);
302         buffer_len -= sizeof (struct icmp);
304         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
305         {
306                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
307                 return (NULL);
308         }
310         if (icmp_hdr->icmp6_code != 0)
311         {
312                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
313                 return (NULL);
314         }
316         ident = ntohs (icmp_hdr->icmp6_id);
317         seq   = ntohs (icmp_hdr->icmp6_seq);
319         for (ptr = ph; ptr != NULL; ptr = ptr->next)
320         {
321                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
322                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
324                 if (ptr->addrfamily != AF_INET6)
325                         continue;
327                 if (!timerisset (ptr->timer))
328                         continue;
330                 if (ptr->ident != ident)
331                         continue;
333                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
334                         continue;
336                 dprintf ("Match found: hostname = %s, ident = 0x%04x, seq = %i\n",
337                                 ptr->hostname, ident, seq);
339                 break;
340         }
342         if (ptr == NULL)
343         {
344                 dprintf ("No match found for ident = 0x%04x, seq = %i\n",
345                                 ident, seq);
346         }
348         return (ptr);
351 static int ping_receive_one (int fd, pinghost_t *ph, struct timeval *now)
353         char   buffer[4096];
354         size_t buffer_len;
356         struct timeval diff;
358         pinghost_t *host = NULL;
360         struct sockaddr_storage sa;
361         socklen_t               sa_len;
363         sa_len = sizeof (sa);
365         buffer_len = recvfrom (fd, buffer, sizeof (buffer), 0,
366                         (struct sockaddr *) &sa, &sa_len);
367         if (buffer_len == -1)
368         {
369                 dprintf ("recvfrom: %s\n", strerror (errno));
370                 return (-1);
371         }
373         dprintf ("Read %u bytes from fd = %i\n", (unsigned int) buffer_len, fd);
375         if (sa.ss_family == AF_INET)
376         {
377                 if ((host = ping_receive_ipv4 (ph, buffer, buffer_len)) == NULL)
378                         return (-1);
379         }
380         else if (sa.ss_family == AF_INET6)
381         {
382                 if ((host = ping_receive_ipv6 (ph, buffer, buffer_len)) == NULL)
383                         return (-1);
384         }
386         dprintf ("rcvd: %12i.%06i\n",
387                         (int) now->tv_sec,
388                         (int) now->tv_usec);
389         dprintf ("sent: %12i.%06i\n",
390                         (int) host->timer->tv_sec,
391                         (int) host->timer->tv_usec);
393         if (ping_timeval_sub (now, host->timer, &diff) < 0)
394         {
395                 timerclear (host->timer);
396                 return (-1);
397         }
399         dprintf ("diff: %12i.%06i\n",
400                         (int) diff.tv_sec,
401                         (int) diff.tv_usec);
403         host->latency  = ((double) diff.tv_usec) / 1000.0;
404         host->latency += ((double) diff.tv_sec)  * 1000.0;
406         timerclear (host->timer);
408         return (0);
411 static int ping_receive_all (pingobj_t *obj)
413         fd_set readfds;
414         int num_readfds;
415         int max_readfds;
417         pinghost_t *ph;
418         pinghost_t *ptr;
420         struct timeval endtime;
421         struct timeval nowtime;
422         struct timeval timeout;
423         int status;
425         int ret;
427         ph = obj->head;
428         ret = 0;
430         for (ptr = ph; ptr != NULL; ptr = ptr->next)
431                 ptr->latency = -1.0;
433         if (gettimeofday (&nowtime, NULL) == -1)
434         {
435                 ping_set_error (obj, "gettimeofday", strerror (errno));
436                 return (-1);
437         }
439         /* Set up timeout */
440         timeout.tv_sec = (time_t) obj->timeout;
441         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
443         dprintf ("Set timeout to %i.%06i seconds\n",
444                         (int) timeout.tv_sec,
445                         (int) timeout.tv_usec);
447         ping_timeval_add (&nowtime, &timeout, &endtime);
449         while (1)
450         {
451                 FD_ZERO (&readfds);
452                 num_readfds =  0;
453                 max_readfds = -1;
455                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
456                 {
457                         if (!timerisset (ptr->timer))
458                                 continue;
460                         FD_SET (ptr->fd, &readfds);
461                         num_readfds++;
463                         if (max_readfds < ptr->fd)
464                                 max_readfds = ptr->fd;
465                 }
467                 if (num_readfds == 0)
468                         break;
470                 if (gettimeofday (&nowtime, NULL) == -1)
471                 {
472                         ping_set_error (obj, "gettimeofday", strerror (errno));
473                         return (-1);
474                 }
476                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
477                         break;
479                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_readfds,
480                                 (int) timeout.tv_sec,
481                                 (int) timeout.tv_usec);
483                 status = select (max_readfds + 1, &readfds, NULL, NULL, &timeout);
485                 if (gettimeofday (&nowtime, NULL) == -1)
486                 {
487                         ping_set_error (obj, "gettimeofday", strerror (errno));
488                         return (-1);
489                 }
490                 
491                 if ((status == -1) && (errno == EINTR))
492                 {
493                         dprintf ("select was interrupted by signal..\n");
494                         continue;
495                 }
496                 else if (status < 0)
497                 {
498                         dprintf ("select: %s\n", strerror (errno));
499                         break;
500                 }
501                 else if (status == 0)
502                 {
503                         dprintf ("select timed out\n");
504                         break;
505                 }
507                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
508                 {
509                         if (FD_ISSET (ptr->fd, &readfds))
510                                 if (ping_receive_one (ptr->fd, ph, &nowtime) == 0)
511                                         ret++;
512                 }
513         } /* while (1) */
514         
515         return (ret);
518 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
519  * Sending functions:                                                        *
520  *                                                                           *
521  * ping_send_all                                                             *
522  * +-> ping_send_one_ipv4                                                    *
523  * `-> ping_send_one_ipv6                                                    *
524  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
525 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
526                 const void *buf, size_t buflen)
528         ssize_t ret;
530         if (gettimeofday (ph->timer, NULL) == -1)
531         {
532                 timerclear (ph->timer);
533                 return (-1);
534         }
536         ret = sendto (ph->fd, buf, buflen, 0,
537                         (struct sockaddr *) ph->addr, ph->addrlen);
539         if (ret < 0)
540         {
541 #if defined(EHOSTUNREACH)
542                 if (errno == EHOSTUNREACH)
543                         return (0);
544 #endif
545 #if defined(ENETUNREACH)
546                 if (errno == ENETUNREACH)
547                         return (0);
548 #endif
549                 ping_set_error (obj, "sendto", strerror (errno));
550         }
552         return (ret);
555 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
557         struct icmp *icmp4;
558         int status;
560         char buf[4096];
561         int  buflen;
563         char *data;
564         int   datalen;
566         dprintf ("ph->hostname = %s\n", ph->hostname);
568         memset (buf, '\0', sizeof (buf));
569         icmp4 = (struct icmp *) buf;
570         data  = (char *) (icmp4 + 1);
572         icmp4->icmp_type  = ICMP_ECHO;
573         icmp4->icmp_code  = 0;
574         icmp4->icmp_cksum = 0;
575         icmp4->icmp_id    = htons (ph->ident);
576         icmp4->icmp_seq   = htons (ph->sequence);
578         buflen = 4096 - sizeof (struct icmp);
579         strncpy (data, ph->data, buflen);
580         datalen = strlen (data);
582         buflen = datalen + sizeof (struct icmp);
584         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
586         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
588         status = ping_sendto (obj, ph, buf, buflen);
589         if (status < 0)
590         {
591                 perror ("ping_sendto");
592                 return (-1);
593         }
595         dprintf ("sendto: status = %i\n", status);
597         return (0);
600 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
602         struct icmp6_hdr *icmp6;
603         int status;
605         char buf[4096];
606         int  buflen;
608         char *data;
609         int   datalen;
611         dprintf ("ph->hostname = %s\n", ph->hostname);
613         memset (buf, '\0', sizeof (buf));
614         icmp6 = (struct icmp6_hdr *) buf;
615         data  = (char *) (icmp6 + 1);
617         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
618         icmp6->icmp6_code  = 0;
619         /* The checksum will be calculated by the TCP/IP stack.  */
620         /* FIXME */
621         icmp6->icmp6_cksum = 0;
622         icmp6->icmp6_id    = htons (ph->ident);
623         icmp6->icmp6_seq   = htons (ph->sequence);
625         buflen = 4096 - sizeof (struct icmp6_hdr);
626         strncpy (data, ph->data, buflen);
627         datalen = strlen (data);
629         buflen = datalen + sizeof (struct icmp6_hdr);
631         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
633         status = ping_sendto (obj, ph, buf, buflen);
634         if (status < 0)
635         {
636                 perror ("ping_sendto");
637                 return (-1);
638         }
640         dprintf ("sendto: status = %i\n", status);
642         return (0);
645 static int ping_send_all (pingobj_t *obj)
647         pinghost_t *ph;
648         pinghost_t *ptr;
650         int ret;
652         ret = 0;
653         ph = obj->head;
655         for (ptr = ph; ptr != NULL; ptr = ptr->next)
656         {
657                 /* start timer.. The GNU `ping6' starts the timer before
658                  * sending the packet, so I will do that too */
659                 if (gettimeofday (ptr->timer, NULL) == -1)
660                 {
661                         dprintf ("gettimeofday: %s\n", strerror (errno));
662                         timerclear (ptr->timer);
663                         ret--;
664                         continue;
665                 }
666                 else
667                 {
668                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
669                 }
671                 if (ptr->addrfamily == AF_INET6)
672                 {       
673                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
674                         if (ping_send_one_ipv6 (obj, ptr) != 0)
675                         {
676                                 timerclear (ptr->timer);
677                                 ret--;
678                                 continue;
679                         }
680                 }
681                 else if (ptr->addrfamily == AF_INET)
682                 {
683                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
684                         if (ping_send_one_ipv4 (obj, ptr) != 0)
685                         {
686                                 timerclear (ptr->timer);
687                                 ret--;
688                                 continue;
689                         }
690                 }
691                 else /* this should not happen */
692                 {
693                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
694                         timerclear (ptr->timer);
695                         ret--;
696                         continue;
697                 }
699                 ptr->sequence++;
700         }
702         return (ret);
705 /*
706  * Set the TTL of a socket protocol independently.
707  */
708 static int ping_set_ttl (pinghost_t *ph, int ttl)
710         int ret = -2;
712         if (ph->addrfamily == AF_INET)
713         {
714                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL, &ttl, sizeof (ttl));
715         }
716         else if (ph->addrfamily == AF_INET6)
717         {
718                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof (ttl));
719         }
721         return (ret);
724 static int ping_get_ident (void)
726         int fd;
727         static int did_seed = 0;
729         int retval;
731         if (did_seed == 0)
732         {
733                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
734                 {
735                         unsigned int seed;
737                         if (read (fd, &seed, sizeof (seed)) != -1)
738                         {
739                                 did_seed = 1;
740                                 dprintf ("Random seed: %i\n", seed);
741                                 srandom (seed);
742                         }
744                         close (fd);
745                 }
746                 else
747                 {
748                         dprintf ("open (/dev/urandom): %s\n", strerror (errno));
749                 }
750         }
752         retval = (int) random ();
754         dprintf ("Random number: %i\n", retval);
755         
756         return (retval);
759 static pinghost_t *ping_alloc (void)
761         pinghost_t *ph;
762         size_t      ph_size;
764         ph_size = sizeof (pinghost_t)
765                 + sizeof (struct sockaddr_storage)
766                 + sizeof (struct timeval);
768         ph = (pinghost_t *) malloc (ph_size);
769         if (ph == NULL)
770                 return (NULL);
772         memset (ph, '\0', ph_size);
774         ph->timer   = (struct timeval *) (ph + 1);
775         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
777         ph->addrlen = sizeof (struct sockaddr_storage);
778         ph->latency = -1.0;
779         ph->ident   = ping_get_ident () & 0xFFFF;
781         return (ph);
784 static void ping_free (pinghost_t *ph)
786         if (ph->hostname != NULL)
787                 free (ph->hostname);
789         if (ph->data != NULL)
790                 free (ph->data);
792         free (ph);
795 /*
796  * public methods
797  */
798 const char *ping_get_error (pingobj_t *obj)
800         return (obj->errmsg);
803 pingobj_t *ping_construct (void)
805         pingobj_t *obj;
807         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
808                 return (NULL);
809         memset (obj, '\0', sizeof (pingobj_t));
811         obj->timeout    = PING_DEF_TIMEOUT;
812         obj->ttl        = PING_DEF_TTL;
813         obj->addrfamily = PING_DEF_AF;
814         obj->data       = strdup (PING_DEF_DATA);
816         return (obj);
819 void ping_destroy (pingobj_t *obj)
821         pinghost_t *current;
822         pinghost_t *next;
824         current = obj->head;
825         next = NULL;
827         while (current != NULL)
828         {
829                 next = current->next;
830                 ping_free (current);
831                 current = next;
832         }
834         if (obj->data != NULL)
835                 free (obj->data);
837         free (obj);
839         return;
842 int ping_setopt (pingobj_t *obj, int option, void *value)
844         int ret = 0;
846         switch (option)
847         {
848                 case PING_OPT_TIMEOUT:
849                         obj->timeout = *((double *) value);
850                         if (obj->timeout < 0.0)
851                         {
852                                 obj->timeout = PING_DEF_TIMEOUT;
853                                 ret = -1;
854                         }
855                         break;
857                 case PING_OPT_TTL:
858                         obj->ttl = *((int *) value);
859                         if ((obj->ttl < 1) || (obj->ttl > 255))
860                         {
861                                 obj->ttl = PING_DEF_TTL;
862                                 ret = -1;
863                         }
864                         break;
866                 case PING_OPT_AF:
867                         obj->addrfamily = *((int *) value);
868                         if ((obj->addrfamily != AF_UNSPEC)
869                                         && (obj->addrfamily != AF_INET)
870                                         && (obj->addrfamily != AF_INET6))
871                         {
872                                 obj->addrfamily = PING_DEF_AF;
873                                 ret = -1;
874                         }
875                         break;
877                 case PING_OPT_DATA:
878                         if (obj->data != NULL)
879                         {
880                                 free (obj->data);
881                                 obj->data = NULL;
882                         }
883                         obj->data = strdup ((const char *) value);
884                         break;
886                 default:
887                         ret = -2;
888         } /* switch (option) */
890         return (ret);
891 } /* int ping_setopt */
894 int ping_send (pingobj_t *obj)
896         int ret;
898         if (ping_send_all (obj) < 0)
899                 return (-1);
901         if ((ret = ping_receive_all (obj)) < 0)
902                 return (-2);
904         return (ret);
907 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
909         while (ph != NULL)
910         {
911                 if (strcasecmp (ph->hostname, host) == 0)
912                         break;
914                 ph = ph->next;
915         }
917         return (ph);
920 int ping_host_add (pingobj_t *obj, const char *host)
922         pinghost_t *ph;
924         struct sockaddr_storage sockaddr;
925         socklen_t               sockaddr_len;
927         struct addrinfo  ai_hints;
928         struct addrinfo *ai_list, *ai_ptr;
929         int              ai_return;
931         dprintf ("host = %s\n", host);
933         if (ping_host_search (obj->head, host) != NULL)
934                 return (0);
936         memset (&ai_hints, '\0', sizeof (ai_hints));
937         ai_hints.ai_flags     = 0;
938 #ifdef AI_ADDRCONFIG
939         ai_hints.ai_flags    |= AI_ADDRCONFIG;
940 #endif
941         ai_hints.ai_family    = obj->addrfamily;
942         ai_hints.ai_socktype  = SOCK_RAW;
944         if ((ph = ping_alloc ()) == NULL)
945         {
946                 dprintf ("Out of memory!\n");
947                 return (-1);
948         }
950         if ((ph->hostname = strdup (host)) == NULL)
951         {
952                 dprintf ("Out of memory!\n");
953                 ping_set_error (obj, "strdup", strerror (errno));
954                 ping_free (ph);
955                 return (-1);
956         }
958         /* obj->data is not garuanteed to be != NULL */
959         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
960         {
961                 dprintf ("Out of memory!\n");
962                 ping_set_error (obj, "strdup", strerror (errno));
963                 ping_free (ph);
964                 return (-1);
965         }
967         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
968         {
969                 dprintf ("getaddrinfo failed\n");
970                 ping_set_error (obj, "getaddrinfo",
971                                 (ai_return == EAI_SYSTEM)
972                                 ? strerror (errno)
973                                 : gai_strerror (ai_return));
974                 ping_free (ph);
975                 return (-1);
976         }
978         if (ai_list == NULL)
979                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
981         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
982         {
983                 ph->fd = -1;
985                 sockaddr_len = sizeof (sockaddr);
986                 memset (&sockaddr, '\0', sockaddr_len);
988                 if (ai_ptr->ai_family == AF_INET)
989                 {
990                         struct sockaddr_in *si;
992                         si = (struct sockaddr_in *) &sockaddr;
993                         si->sin_family = AF_INET;
994                         si->sin_port   = htons (ph->ident);
995                         si->sin_addr.s_addr = htonl (INADDR_ANY);
997                         ai_ptr->ai_socktype = SOCK_RAW;
998                         ai_ptr->ai_protocol = IPPROTO_ICMP;
999                 }
1000                 else if (ai_ptr->ai_family == AF_INET6)
1001                 {
1002                         struct sockaddr_in6 *si;
1004                         si = (struct sockaddr_in6 *) &sockaddr;
1005                         si->sin6_family = AF_INET6;
1006                         si->sin6_port   = htons (ph->ident);
1007                         si->sin6_addr   = in6addr_any;
1009                         ai_ptr->ai_socktype = SOCK_RAW;
1010                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1011                 }
1012                 else
1013                 {
1014                         char errmsg[PING_ERRMSG_LEN];
1016                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1017                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1019                         dprintf (errmsg);
1020                         ping_set_error (obj, "getaddrinfo", errmsg);
1021                         continue;
1022                 }
1024                 /* TODO: Move this to a static function `ping_open_socket' and
1025                  * call it whenever the socket dies. */
1026                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1027                 if (ph->fd == -1)
1028                 {
1029                         dprintf ("socket: %s\n", strerror (errno));
1030                         ping_set_error (obj, "socket", strerror (errno));
1031                         continue;
1032                 }
1034 /*
1035  * The majority vote of operating systems has decided that you don't need to
1036  * bind here. This code should be reactivated to bind to a specific address,
1037  * though. See the `-I' option of `ping(1)' (GNU).  -octo
1038  */
1039 #if 0
1040                 if (bind (ph->fd, (struct sockaddr *) &sockaddr, sockaddr_len) == -1)
1041                 {
1042                         dprintf ("bind: %s\n", strerror (errno));
1043                         ping_set_error (obj, "bind", strerror (errno));
1044                         close (ph->fd);
1045                         ph->fd = -1;
1046                         continue;
1047                 }
1048 #endif
1050                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1051                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1052                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1053                 ph->addrlen = ai_ptr->ai_addrlen;
1054                 ph->addrfamily = ai_ptr->ai_family;
1056                 break;
1057         }
1059         freeaddrinfo (ai_list);
1061         if (ph->fd < 0)
1062         {
1063                 free (ph->hostname);
1064                 free (ph);
1065                 return (-1);
1066         }
1068         /*
1069          * Adding in the front is much easier, but then the iterator will
1070          * return the host that was added last as first host. That's just not
1071          * nice. -octo
1072          */
1073         if (obj->head == NULL)
1074         {
1075                 obj->head = ph;
1076         }
1077         else
1078         {
1079                 pinghost_t *hptr;
1081                 hptr = obj->head;
1082                 while (hptr->next != NULL)
1083                         hptr = hptr->next;
1085                 assert ((hptr != NULL) && (hptr->next == NULL));
1086                 hptr->next = ph;
1087         }
1089         ping_set_ttl (ph, obj->ttl);
1091         return (0);
1094 int ping_host_remove (pingobj_t *obj, const char *host)
1096         pinghost_t *pre, *cur;
1098         pre = NULL;
1099         cur = obj->head;
1101         while (cur != NULL)
1102         {
1103                 if (strcasecmp (host, cur->hostname))
1104                         break;
1106                 pre = cur;
1107                 cur = cur->next;
1108         }
1110         if (cur == NULL)
1111         {
1112                 ping_set_error (obj, "ping_host_remove", "Host not found");
1113                 return (-1);
1114         }
1116         if (pre == NULL)
1117                 obj->head = cur->next;
1118         else
1119                 pre->next = cur->next;
1120         
1121         if (cur->fd >= 0)
1122                 close (cur->fd);
1124         ping_free (cur);
1126         return (0);
1129 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1131         return ((pingobj_iter_t *) obj->head);
1134 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1136         return ((pingobj_iter_t *) iter->next);
1139 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1140                 void *buffer, size_t *buffer_len)
1142         int ret = EINVAL;
1144         size_t orig_buffer_len = *buffer_len;
1146         switch (info)
1147         {
1148                 case PING_INFO_HOSTNAME:
1149                         ret = ENOMEM;
1150                         *buffer_len = strlen (iter->hostname);
1151                         if (orig_buffer_len <= *buffer_len)
1152                                 break;
1153                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1154                          * will copy `*buffer_len' and pad the rest of
1155                          * `buffer' with null-bytes */
1156                         strncpy (buffer, iter->hostname, orig_buffer_len);
1157                         ret = 0;
1158                         break;
1160                 case PING_INFO_ADDRESS:
1161                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1162                                         iter->addrlen,
1163                                         (char *) buffer,
1164                                         *buffer_len,
1165                                         NULL, 0,
1166                                         NI_NUMERICHOST);
1167                         if (ret != 0)
1168                         {
1169                                 if ((ret == EAI_MEMORY)
1170 #ifdef EAI_OVERFLOW
1171                                                 || (ret == EAI_OVERFLOW)
1172 #endif
1173                                    )
1174                                         ret = ENOMEM;
1175                                 else if (ret == EAI_SYSTEM)
1176                                         /* XXX: Not thread-safe! */
1177                                         ret = errno;
1178                                 else
1179                                         ret = EINVAL;
1180                         }
1181                         break;
1183                 case PING_INFO_FAMILY:
1184                         ret = ENOMEM;
1185                         *buffer_len = sizeof (int);
1186                         if (orig_buffer_len < sizeof (int))
1187                                 break;
1188                         *((int *) buffer) = iter->addrfamily;
1189                         ret = 0;
1190                         break;
1192                 case PING_INFO_LATENCY:
1193                         ret = ENOMEM;
1194                         *buffer_len = sizeof (double);
1195                         if (orig_buffer_len < sizeof (double))
1196                                 break;
1197                         *((double *) buffer) = iter->latency;
1198                         ret = 0;
1199                         break;
1201                 case PING_INFO_SEQUENCE:
1202                         ret = ENOMEM;
1203                         *buffer_len = sizeof (unsigned int);
1204                         if (orig_buffer_len < sizeof (unsigned int))
1205                                 break;
1206                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1207                         ret = 0;
1208                         break;
1210                 case PING_INFO_IDENT:
1211                         ret = ENOMEM;
1212                         *buffer_len = sizeof (uint16_t);
1213                         if (orig_buffer_len < sizeof (uint16_t))
1214                                 break;
1215                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1216                         ret = 0;
1217                         break;
1219                 case PING_INFO_DATA:
1220                         ret = ENOMEM;
1221                         *buffer_len = strlen (iter->data);
1222                         if (orig_buffer_len < *buffer_len)
1223                                 break;
1224                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1225                         ret = 0;
1226                         break;
1227         }
1229         return (ret);
1232 void *ping_iterator_get_context (pingobj_iter_t *iter)
1234         return (iter->context);
1237 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1239         iter->context = context;