src/liboping.c: Use an uint8_t for storing the ToS.
[liboping.git] / src / liboping.c
1 /**
2  * Object oriented C module to send ICMP and ICMPv6 `echo's.
3  * Copyright (C) 2006-2010  Florian octo Forster <octo at verplant.org>
4  *
5  * This library is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU Lesser General Public License as published by the
7  * Free Software Foundation; either version 2.1 of the License, or (at your
8  * option) any later version.
9  * 
10  * This library is distributed in the hope that it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
13  * for more details.
14  * 
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with this library; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18  */
19
20 #if HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23
24 #if STDC_HEADERS
25 # include <stdlib.h>
26 # include <stdio.h>
27 # include <string.h>
28 # include <inttypes.h>
29 # include <errno.h>
30 # include <assert.h>
31 #else
32 # error "You don't have the standard C99 header files installed"
33 #endif /* STDC_HEADERS */
34
35 #ifdef HAVE_STDINT_H
36 # include <stdint.h>
37 #endif
38
39 #if HAVE_UNISTD_H
40 # include <unistd.h>
41 #endif
42
43 #if HAVE_FCNTL_H
44 # include <fcntl.h>
45 #endif
46 #if HAVE_SYS_TYPES_H
47 # include <sys/types.h>
48 #endif
49 #if HAVE_SYS_STAT_H
50 # include <sys/stat.h>
51 #endif
52
53 #if TIME_WITH_SYS_TIME
54 # include <sys/time.h>
55 # include <time.h>
56 #else
57 # if HAVE_SYS_TIME_H
58 #  include <sys/time.h>
59 # else
60 #  include <time.h>
61 # endif
62 #endif
63
64 #if HAVE_SYS_SOCKET_H
65 # include <sys/socket.h>
66 #endif
67
68 #if HAVE_NETDB_H
69 # include <netdb.h>
70 #endif
71
72 #if HAVE_NETINET_IN_SYSTM_H
73 # include <netinet/in_systm.h>
74 #endif
75 #if HAVE_NETINET_IN_H
76 # include <netinet/in.h>
77 #endif
78 #if HAVE_NETINET_IP_H
79 # include <netinet/ip.h>
80 #endif
81 #if HAVE_NETINET_IP_ICMP_H
82 # include <netinet/ip_icmp.h>
83 #endif
84 #ifdef HAVE_NETINET_IP_VAR_H
85 # include <netinet/ip_var.h>
86 #endif
87 #if HAVE_NETINET_IP6_H
88 # include <netinet/ip6.h>
89 #endif
90 #if HAVE_NETINET_ICMP6_H
91 # include <netinet/icmp6.h>
92 #endif
93
94 #include "oping.h"
95
96 #if WITH_DEBUG
97 # define dprintf(...) printf ("%s[%4i]: %-20s: ", __FILE__, __LINE__, __FUNCTION__); printf (__VA_ARGS__)
98 #else
99 # define dprintf(...) /**/
100 #endif
101
102 #define PING_ERRMSG_LEN 256
103
104 struct pinghost
105 {
106         /* username: name passed in by the user */
107         char                    *username;
108         /* hostname: name returned by the reverse lookup */
109         char                    *hostname;
110         struct sockaddr_storage *addr;
111         socklen_t                addrlen;
112         int                      addrfamily;
113         int                      fd;
114         int                      ident;
115         int                      sequence;
116         struct timeval          *timer;
117         double                   latency;
118         uint32_t                 dropped;
119         int                      recv_ttl;
120         uint8_t                  recv_tos;
121         char                    *data;
122
123         void                    *context;
124
125         struct pinghost         *next;
126 };
127
128 struct pingobj
129 {
130         double                   timeout;
131         int                      ttl;
132         int                      addrfamily;
133         uint8_t                  tos;
134         char                    *data;
135
136         struct sockaddr         *srcaddr;
137         socklen_t                srcaddrlen;
138
139         char                    *device;
140
141         char                     errmsg[PING_ERRMSG_LEN];
142
143         pinghost_t              *head;
144 };
145
146 /*
147  * private (static) functions
148  */
149 /* Even though Posix requires "strerror_r" to return an "int",
150  * some systems (e.g. the GNU libc) return a "char *" _and_
151  * ignore the second argument ... -tokkee */
152 static char *sstrerror (int errnum, char *buf, size_t buflen)
153 {
154         buf[0] = 0;
155
156 #if !HAVE_STRERROR_R
157         {
158                 snprintf (buf, buflen, "Error %i (%#x)", errnum, errnum);
159         }
160 /* #endif !HAVE_STRERROR_R */
161
162 #elif STRERROR_R_CHAR_P
163         {
164                 char *temp;
165                 temp = strerror_r (errnum, buf, buflen);
166                 if (buf[0] == 0)
167                 {
168                         if ((temp != NULL) && (temp != buf) && (temp[0] != 0))
169                                 strncpy (buf, temp, buflen);
170                         else
171                                 strncpy (buf, "strerror_r did not return "
172                                                 "an error message", buflen);
173                 }
174         }
175 /* #endif STRERROR_R_CHAR_P */
176
177 #else
178         if (strerror_r (errnum, buf, buflen) != 0)
179         {
180                 snprintf (buf, buflen, "Error %i (%#x); "
181                                 "Additionally, strerror_r failed.",
182                                 errnum, errnum);
183         }
184 #endif /* STRERROR_R_CHAR_P */
185
186         buf[buflen - 1] = 0;
187
188         return (buf);
189 } /* char *sstrerror */
190
191 static void ping_set_error (pingobj_t *obj, const char *function,
192                 const char *message)
193 {
194         snprintf (obj->errmsg, sizeof (obj->errmsg),
195                         "%s: %s", function, message);
196         obj->errmsg[sizeof (obj->errmsg) - 1] = 0;
197 }
198
199 static void ping_set_errno (pingobj_t *obj, int error_number)
200 {
201         sstrerror (error_number, obj->errmsg, sizeof (obj->errmsg));
202 }
203
204 static int ping_timeval_add (struct timeval *tv1, struct timeval *tv2,
205                 struct timeval *res)
206 {
207         res->tv_sec  = tv1->tv_sec  + tv2->tv_sec;
208         res->tv_usec = tv1->tv_usec + tv2->tv_usec;
209
210         while (res->tv_usec > 1000000)
211         {
212                 res->tv_usec -= 1000000;
213                 res->tv_sec++;
214         }
215
216         return (0);
217 }
218
219 static int ping_timeval_sub (struct timeval *tv1, struct timeval *tv2,
220                 struct timeval *res)
221 {
222         if ((tv1->tv_sec < tv2->tv_sec)
223                         || ((tv1->tv_sec == tv2->tv_sec)
224                                 && (tv1->tv_usec < tv2->tv_usec)))
225                 return (-1);
226
227         res->tv_sec  = tv1->tv_sec  - tv2->tv_sec;
228         res->tv_usec = tv1->tv_usec - tv2->tv_usec;
229
230         assert ((res->tv_sec > 0) || ((res->tv_sec == 0) && (res->tv_usec >= 0)));
231
232         while (res->tv_usec < 0)
233         {
234                 res->tv_usec += 1000000;
235                 res->tv_sec--;
236         }
237
238         return (0);
239 }
240
241 static uint16_t ping_icmp4_checksum (char *buf, size_t len)
242 {
243         uint32_t sum = 0;
244         uint16_t ret = 0;
245
246         uint16_t *ptr;
247
248         for (ptr = (uint16_t *) buf; len > 1; ptr++, len -= 2)
249                 sum += *ptr;
250
251         if (len == 1)
252         {
253                 *(char *) &ret = *(char *) ptr;
254                 sum += ret;
255         }
256
257         /* Do this twice to get all possible carries.. */
258         sum = (sum >> 16) + (sum & 0xFFFF);
259         sum = (sum >> 16) + (sum & 0xFFFF);
260
261         ret = ~sum;
262
263         return (ret);
264 }
265
266 static pinghost_t *ping_receive_ipv4 (pingobj_t *obj, char *buffer,
267                 size_t buffer_len)
268 {
269         struct ip *ip_hdr;
270         struct icmp *icmp_hdr;
271
272         size_t ip_hdr_len;
273
274         uint16_t recv_checksum;
275         uint16_t calc_checksum;
276
277         uint16_t ident;
278         uint16_t seq;
279
280         pinghost_t *ptr;
281
282         if (buffer_len < sizeof (struct ip))
283                 return (NULL);
284
285         ip_hdr     = (struct ip *) buffer;
286         ip_hdr_len = ip_hdr->ip_hl << 2;
287
288         if (buffer_len < ip_hdr_len)
289                 return (NULL);
290
291         buffer     += ip_hdr_len;
292         buffer_len -= ip_hdr_len;
293
294         if (buffer_len < sizeof (struct icmp))
295                 return (NULL);
296
297         icmp_hdr = (struct icmp *) buffer;
298         buffer     += sizeof (struct icmp);
299         buffer_len -= sizeof (struct icmp);
300
301         if (icmp_hdr->icmp_type != ICMP_ECHOREPLY)
302         {
303                 dprintf ("Unexpected ICMP type: %i\n", icmp_hdr->icmp_type);
304                 return (NULL);
305         }
306
307         recv_checksum = icmp_hdr->icmp_cksum;
308         icmp_hdr->icmp_cksum = 0;
309         calc_checksum = ping_icmp4_checksum ((char *) icmp_hdr,
310                         sizeof (struct icmp) + buffer_len);
311
312         if (recv_checksum != calc_checksum)
313         {
314                 dprintf ("Checksum missmatch: Got 0x%04"PRIx16", "
315                                 "calculated 0x%04"PRIx16"\n",
316                                 recv_checksum, calc_checksum);
317                 return (NULL);
318         }
319
320         ident = ntohs (icmp_hdr->icmp_id);
321         seq   = ntohs (icmp_hdr->icmp_seq);
322
323         /* We have to iterate over all hosts, since ICMPv4 packets may
324          * be received on any raw v4 socket. */
325         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
326         {
327                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
328                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
329
330                 if (ptr->addrfamily != AF_INET)
331                         continue;
332
333                 if (!timerisset (ptr->timer))
334                         continue;
335
336                 if (ptr->ident != ident)
337                         continue;
338
339                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
340                         continue;
341
342                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
343                                 "seq = %"PRIu16"\n",
344                                 ptr->hostname, ident, seq);
345
346                 break;
347         }
348
349         if (ptr == NULL)
350         {
351                 dprintf ("No match found for ident = 0x%04"PRIx16", seq = %"PRIu16"\n",
352                                 ident, seq);
353         }
354
355         if (ptr != NULL){
356                 ptr->recv_ttl = (int)     ip_hdr->ip_ttl;
357                 ptr->recv_tos = (uint8_t) ip_hdr->ip_tos;
358         }
359         return (ptr);
360 }
361
362 #ifndef ICMP6_ECHO_REQUEST
363 # ifdef ICMP6_ECHO /* AIX netinet/ip6_icmp.h */
364 #  define ICMP6_ECHO_REQUEST ICMP6_ECHO
365 # else
366 #  define ICMP6_ECHO_REQUEST 128
367 # endif
368 #endif
369
370 #ifndef ICMP6_ECHO_REPLY
371 # ifdef ICMP6_ECHOREPLY /* AIX netinet/ip6_icmp.h */
372 #  define ICMP6_ECHO_REPLY ICMP6_ECHOREPLY
373 # else
374 #  define ICMP6_ECHO_REPLY 129
375 # endif
376 #endif
377
378 static pinghost_t *ping_receive_ipv6 (pingobj_t *obj, char *buffer,
379                 size_t buffer_len)
380 {
381         struct icmp6_hdr *icmp_hdr;
382
383         uint16_t ident;
384         uint16_t seq;
385
386         pinghost_t *ptr;
387
388         if (buffer_len < sizeof (struct icmp6_hdr))
389                 return (NULL);
390
391         icmp_hdr = (struct icmp6_hdr *) buffer;
392         buffer     += sizeof (struct icmp);
393         buffer_len -= sizeof (struct icmp);
394
395         if (icmp_hdr->icmp6_type != ICMP6_ECHO_REPLY)
396         {
397                 dprintf ("Unexpected ICMP type: %02x\n", icmp_hdr->icmp6_type);
398                 return (NULL);
399         }
400
401         if (icmp_hdr->icmp6_code != 0)
402         {
403                 dprintf ("Unexpected ICMP code: %02x\n", icmp_hdr->icmp6_code);
404                 return (NULL);
405         }
406
407         ident = ntohs (icmp_hdr->icmp6_id);
408         seq   = ntohs (icmp_hdr->icmp6_seq);
409
410         /* We have to iterate over all hosts, since ICMPv6 packets may
411          * be received on any raw v6 socket. */
412         for (ptr = obj->head; ptr != NULL; ptr = ptr->next)
413         {
414                 dprintf ("hostname = %s, ident = 0x%04x, seq = %i\n",
415                                 ptr->hostname, ptr->ident, ((ptr->sequence - 1) & 0xFFFF));
416
417                 if (ptr->addrfamily != AF_INET6)
418                         continue;
419
420                 if (!timerisset (ptr->timer))
421                         continue;
422
423                 if (ptr->ident != ident)
424                         continue;
425
426                 if (((ptr->sequence - 1) & 0xFFFF) != seq)
427                         continue;
428
429                 dprintf ("Match found: hostname = %s, ident = 0x%04"PRIx16", "
430                                 "seq = %"PRIu16"\n",
431                                 ptr->hostname, ident, seq);
432
433                 break;
434         }
435
436         if (ptr == NULL)
437         {
438                 dprintf ("No match found for ident = 0x%04"PRIx16", "
439                                 "seq = %"PRIu16"\n",
440                                 ident, seq);
441         }
442
443         return (ptr);
444 }
445
446 static int ping_receive_one (pingobj_t *obj, const pinghost_t *ph,
447                 struct timeval *now)
448 {
449         /* Note: 'ph' is not necessarily the host object for which we receive a
450          * reply. The right object will be returned by ping_receive_ipv*(). For
451          * now, we can only rely on ph->fd and ph->addrfamily. */
452
453         struct timeval diff;
454         pinghost_t *host = NULL;
455         int recv_ttl;
456         uint8_t recv_tos;
457         
458         /*
459          * Set up the receive buffer..
460          */
461         struct msghdr msghdr;
462         struct cmsghdr *cmsg;
463         char payload_buffer[4096];
464         ssize_t payload_buffer_len;
465         char control_buffer[4096];
466         struct iovec payload_iovec;
467
468         memset (&payload_iovec, 0, sizeof (payload_iovec));
469         payload_iovec.iov_base = payload_buffer;
470         payload_iovec.iov_len = sizeof (payload_buffer);
471
472         memset (&msghdr, 0, sizeof (msghdr));
473         /* unspecified source address */
474         msghdr.msg_name = NULL;
475         msghdr.msg_namelen = 0;
476         /* output buffer vector, see readv(2) */
477         msghdr.msg_iov = &payload_iovec;
478         msghdr.msg_iovlen = 1;
479         /* output buffer for control messages */
480         msghdr.msg_control = control_buffer;
481         msghdr.msg_controllen = sizeof (control_buffer);
482         /* flags; this is an output only field.. */
483         msghdr.msg_flags = 0;
484 #ifdef MSG_XPG4_2
485         msghdr.msg_flags |= MSG_XPG4_2;
486 #endif
487
488         payload_buffer_len = recvmsg (ph->fd, &msghdr, /* flags = */ 0);
489         if (payload_buffer_len < 0)
490         {
491 #if WITH_DEBUG
492                 char errbuf[PING_ERRMSG_LEN];
493                 dprintf ("recvfrom: %s\n",
494                                 sstrerror (errno, errbuf, sizeof (errbuf)));
495 #endif
496                 return (-1);
497         }
498         dprintf ("Read %zi bytes from fd = %i\n", payload_buffer_len, ph->fd);
499
500         /* Iterate over all auxiliary data in msghdr */
501         recv_ttl = -1;
502         recv_tos = 0xff;
503         for (cmsg = CMSG_FIRSTHDR (&msghdr); /* {{{ */
504                         cmsg != NULL;
505                         cmsg = CMSG_NXTHDR (&msghdr, cmsg))
506         {
507                 if (ph->addrfamily == AF_INET) /* {{{ */
508                 {
509                         if (cmsg->cmsg_level != IPPROTO_IP)
510                                 continue;
511
512                         if (cmsg->cmsg_type == IP_TOS)
513                         {
514                                 memcpy (&recv_tos, CMSG_DATA (cmsg),
515                                                 sizeof (recv_tos));
516                                 dprintf ("TOSv4 = %#04"PRIx8";\n", recv_tos);
517                         } else
518                         if (cmsg->cmsg_type == IP_TTL)
519                         {
520                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
521                                                 sizeof (recv_ttl));
522                                 dprintf ("TTLv4 = %i;\n", recv_ttl);
523                         }
524                         else
525                         {
526                                 dprintf ("Not handling option %i.\n",
527                                                 cmsg->cmsg_type);
528                         }
529                 } /* }}} */
530                 else if (ph->addrfamily == AF_INET6) /* {{{ */
531                 {
532                         if (cmsg->cmsg_level != IPPROTO_IPV6)
533                                 continue;
534
535                         if (cmsg->cmsg_type == IPV6_RECVTCLASS)
536                         {
537                                 memcpy (&recv_tos, CMSG_DATA (cmsg),
538                                                 sizeof (recv_tos));
539                                 dprintf ("TOSv6 = %#04"PRIx8";\n", recv_tos);
540                         } else
541                         if (cmsg->cmsg_type == IPV6_HOPLIMIT)
542                         {
543                                 memcpy (&recv_ttl, CMSG_DATA (cmsg),
544                                                 sizeof (recv_ttl));
545                                 dprintf ("TTLv6 = %i;\n", recv_ttl);
546                         }
547                         else
548                         {
549                                 dprintf ("Not handling option %i.\n",
550                                                 cmsg->cmsg_type);
551                         }
552                 } /* }}} */
553                 else
554                 {
555                         dprintf ("Don't know how to handle "
556                                         "unknown protocol %i.\n",
557                                         cmsg->cmsg_level);
558                 }
559         } /* }}} for (cmsg) */
560
561         if (ph->addrfamily == AF_INET)
562         {
563                 host = ping_receive_ipv4 (obj, payload_buffer, payload_buffer_len);
564                 if (host == NULL)
565                         return (-1);
566         }
567         else if (ph->addrfamily == AF_INET6)
568         {
569                 host = ping_receive_ipv6 (obj, payload_buffer, payload_buffer_len);
570                 if (host == NULL)
571                         return (-1);
572         }
573         else
574         {
575                 dprintf ("ping_receive_one: Unknown address family %i.\n",
576                                 ph->addrfamily);
577                 return (-1);
578         }
579
580         dprintf ("rcvd: %12i.%06i\n",
581                         (int) now->tv_sec,
582                         (int) now->tv_usec);
583         dprintf ("sent: %12i.%06i\n",
584                         (int) host->timer->tv_sec,
585                         (int) host->timer->tv_usec);
586
587         if (ping_timeval_sub (now, host->timer, &diff) < 0)
588         {
589                 timerclear (host->timer);
590                 return (-1);
591         }
592
593         dprintf ("diff: %12i.%06i\n",
594                         (int) diff.tv_sec,
595                         (int) diff.tv_usec);
596
597         if (recv_ttl >= 0)
598                 host->recv_ttl = recv_ttl;
599         if (recv_tos != 0xffff)
600                 host->recv_tos = recv_tos;
601
602         host->latency  = ((double) diff.tv_usec) / 1000.0;
603         host->latency += ((double) diff.tv_sec)  * 1000.0;
604
605         timerclear (host->timer);
606
607         return (0);
608 }
609
610 static int ping_receive_all (pingobj_t *obj)
611 {
612         fd_set read_fds;
613         fd_set err_fds;
614         int num_fds;
615         int max_fd;
616
617         pinghost_t *ph;
618         pinghost_t *ptr;
619
620         struct timeval endtime;
621         struct timeval nowtime;
622         struct timeval timeout;
623         int status;
624
625         int ret;
626
627         ph = obj->head;
628         ret = 0;
629
630         for (ptr = ph; ptr != NULL; ptr = ptr->next)
631         {
632                 ptr->latency  = -1.0;
633                 ptr->recv_ttl = -1;
634         }
635
636         if (gettimeofday (&nowtime, NULL) == -1)
637         {
638                 ping_set_errno (obj, errno);
639                 return (-1);
640         }
641
642         /* Set up timeout */
643         timeout.tv_sec = (time_t) obj->timeout;
644         timeout.tv_usec = (suseconds_t) (1000000 * (obj->timeout - ((double) timeout.tv_sec)));
645
646         dprintf ("Set timeout to %i.%06i seconds\n",
647                         (int) timeout.tv_sec,
648                         (int) timeout.tv_usec);
649
650         ping_timeval_add (&nowtime, &timeout, &endtime);
651
652         while (1)
653         {
654                 FD_ZERO (&read_fds);
655                 FD_ZERO (&err_fds);
656                 num_fds =  0;
657                 max_fd = -1;
658
659                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
660                 {
661                         if (!timerisset (ptr->timer))
662                                 continue;
663
664                         FD_SET (ptr->fd, &read_fds);
665                         FD_SET (ptr->fd, &err_fds);
666                         num_fds++;
667
668                         if (max_fd < ptr->fd)
669                                 max_fd = ptr->fd;
670                 }
671
672                 if (num_fds == 0)
673                         break;
674
675                 if (gettimeofday (&nowtime, NULL) == -1)
676                 {
677                         ping_set_errno (obj, errno);
678                         return (-1);
679                 }
680
681                 if (ping_timeval_sub (&endtime, &nowtime, &timeout) == -1)
682                         break;
683
684                 dprintf ("Waiting on %i sockets for %i.%06i seconds\n", num_fds,
685                                 (int) timeout.tv_sec,
686                                 (int) timeout.tv_usec);
687
688                 status = select (max_fd + 1, &read_fds, NULL, &err_fds, &timeout);
689
690                 if (gettimeofday (&nowtime, NULL) == -1)
691                 {
692                         ping_set_errno (obj, errno);
693                         return (-1);
694                 }
695                 
696                 if ((status == -1) && (errno == EINTR))
697                 {
698                         dprintf ("select was interrupted by signal..\n");
699                         continue;
700                 }
701                 else if (status < 0)
702                 {
703 #if WITH_DEBUG
704                         char errbuf[PING_ERRMSG_LEN];
705                         dprintf ("select: %s\n",
706                                         sstrerror (errno, errbuf, sizeof (errbuf)));
707 #endif
708                         break;
709                 }
710                 else if (status == 0)
711                 {
712                         dprintf ("select timed out\n");
713                         for (ptr = ph; ptr != NULL; ptr = ptr->next)
714                                 if (ptr->latency < 0.0)
715                                         ptr->dropped++;
716                         break;
717                 }
718
719                 for (ptr = ph; ptr != NULL; ptr = ptr->next)
720                 {
721                         if (FD_ISSET (ptr->fd, &read_fds))
722                         {
723                                 if (ping_receive_one (obj, ptr, &nowtime) == 0)
724                                         ret++;
725                         }
726                         else if (FD_ISSET (ptr->fd, &err_fds))
727                         {
728                                 /* clear the timer in this case so that we
729                                  * don't run into an endless loop. */
730                                 /* TODO: Set an error flag in this case. */
731                                 timerclear (ptr->timer);
732                         }
733                 }
734         } /* while (1) */
735         
736         return (ret);
737 }
738
739 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
740  * Sending functions:                                                        *
741  *                                                                           *
742  * ping_send_all                                                             *
743  * +-> ping_send_one_ipv4                                                    *
744  * `-> ping_send_one_ipv6                                                    *
745  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
746 static ssize_t ping_sendto (pingobj_t *obj, pinghost_t *ph,
747                 const void *buf, size_t buflen)
748 {
749         ssize_t ret;
750
751         if (gettimeofday (ph->timer, NULL) == -1)
752         {
753                 timerclear (ph->timer);
754                 return (-1);
755         }
756
757         ret = sendto (ph->fd, buf, buflen, 0,
758                         (struct sockaddr *) ph->addr, ph->addrlen);
759
760         if (ret < 0)
761         {
762 #if defined(EHOSTUNREACH)
763                 if (errno == EHOSTUNREACH)
764                         return (0);
765 #endif
766 #if defined(ENETUNREACH)
767                 if (errno == ENETUNREACH)
768                         return (0);
769 #endif
770                 ping_set_errno (obj, errno);
771         }
772
773         return (ret);
774 }
775
776 static int ping_send_one_ipv4 (pingobj_t *obj, pinghost_t *ph)
777 {
778         struct icmp *icmp4;
779         int status;
780
781         char buf[4096];
782         int  buflen;
783
784         char *data;
785         int   datalen;
786
787         dprintf ("ph->hostname = %s\n", ph->hostname);
788
789         memset (buf, '\0', sizeof (buf));
790         icmp4 = (struct icmp *) buf;
791         data  = (char *) (icmp4 + 1);
792
793         icmp4->icmp_type  = ICMP_ECHO;
794         icmp4->icmp_code  = 0;
795         icmp4->icmp_cksum = 0;
796         icmp4->icmp_id    = htons (ph->ident);
797         icmp4->icmp_seq   = htons (ph->sequence);
798
799         buflen = 4096 - sizeof (struct icmp);
800         strncpy (data, ph->data, buflen);
801         datalen = strlen (data);
802
803         buflen = datalen + sizeof (struct icmp);
804
805         icmp4->icmp_cksum = ping_icmp4_checksum (buf, buflen);
806
807         dprintf ("Sending ICMPv4 package with ID 0x%04x\n", ph->ident);
808
809         status = ping_sendto (obj, ph, buf, buflen);
810         if (status < 0)
811         {
812                 perror ("ping_sendto");
813                 return (-1);
814         }
815
816         dprintf ("sendto: status = %i\n", status);
817
818         return (0);
819 }
820
821 static int ping_send_one_ipv6 (pingobj_t *obj, pinghost_t *ph)
822 {
823         struct icmp6_hdr *icmp6;
824         int status;
825
826         char buf[4096];
827         int  buflen;
828
829         char *data;
830         int   datalen;
831
832         dprintf ("ph->hostname = %s\n", ph->hostname);
833
834         memset (buf, '\0', sizeof (buf));
835         icmp6 = (struct icmp6_hdr *) buf;
836         data  = (char *) (icmp6 + 1);
837
838         icmp6->icmp6_type  = ICMP6_ECHO_REQUEST;
839         icmp6->icmp6_code  = 0;
840         /* The checksum will be calculated by the TCP/IP stack.  */
841         /* FIXME */
842         icmp6->icmp6_cksum = 0;
843         icmp6->icmp6_id    = htons (ph->ident);
844         icmp6->icmp6_seq   = htons (ph->sequence);
845
846         buflen = 4096 - sizeof (struct icmp6_hdr);
847         strncpy (data, ph->data, buflen);
848         datalen = strlen (data);
849
850         buflen = datalen + sizeof (struct icmp6_hdr);
851
852         dprintf ("Sending ICMPv6 package with ID 0x%04x\n", ph->ident);
853
854         status = ping_sendto (obj, ph, buf, buflen);
855         if (status < 0)
856         {
857                 perror ("ping_sendto");
858                 return (-1);
859         }
860
861         dprintf ("sendto: status = %i\n", status);
862
863         return (0);
864 }
865
866 static int ping_send_all (pingobj_t *obj)
867 {
868         pinghost_t *ph;
869         pinghost_t *ptr;
870
871         int ret;
872
873         ret = 0;
874         ph = obj->head;
875
876         for (ptr = ph; ptr != NULL; ptr = ptr->next)
877         {
878                 /* start timer.. The GNU `ping6' starts the timer before
879                  * sending the packet, so I will do that too */
880                 if (gettimeofday (ptr->timer, NULL) == -1)
881                 {
882 #if WITH_DEBUG
883                         char errbuf[PING_ERRMSG_LEN];
884                         dprintf ("gettimeofday: %s\n",
885                                         sstrerror (errno, errbuf, sizeof (errbuf)));
886 #endif
887                         timerclear (ptr->timer);
888                         ret--;
889                         continue;
890                 }
891                 else
892                 {
893                         dprintf ("timer set for hostname = %s\n", ptr->hostname);
894                 }
895
896                 if (ptr->addrfamily == AF_INET6)
897                 {       
898                         dprintf ("Sending ICMPv6 echo request to `%s'\n", ptr->hostname);
899                         if (ping_send_one_ipv6 (obj, ptr) != 0)
900                         {
901                                 timerclear (ptr->timer);
902                                 ret--;
903                                 continue;
904                         }
905                 }
906                 else if (ptr->addrfamily == AF_INET)
907                 {
908                         dprintf ("Sending ICMPv4 echo request to `%s'\n", ptr->hostname);
909                         if (ping_send_one_ipv4 (obj, ptr) != 0)
910                         {
911                                 timerclear (ptr->timer);
912                                 ret--;
913                                 continue;
914                         }
915                 }
916                 else /* this should not happen */
917                 {
918                         dprintf ("Unknown address family: %i\n", ptr->addrfamily);
919                         timerclear (ptr->timer);
920                         ret--;
921                         continue;
922                 }
923
924                 ptr->sequence++;
925         }
926
927         return (ret);
928 }
929
930 /*
931  * Set the TTL of a socket protocol independently.
932  */
933 static int ping_set_ttl (pinghost_t *ph, int ttl)
934 {
935         int ret = -2;
936
937         if (ph->addrfamily == AF_INET)
938         {
939                 dprintf ("Setting TTLv4 to %i\n", ttl);
940                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TTL,
941                                 &ttl, sizeof (ttl));
942         }
943         else if (ph->addrfamily == AF_INET6)
944         {
945                 dprintf ("Setting TTLv6 to %i\n", ttl);
946                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
947                                 &ttl, sizeof (ttl));
948         }
949
950         return (ret);
951 }
952
953 /*
954  * Set the TOS of a socket protocol independently.
955  */
956 static int ping_set_tos (pinghost_t *ph, uint8_t tos)
957 {
958         int ret = -2;
959
960         if (ph->addrfamily == AF_INET)
961         {
962                 dprintf ("Setting TP_TOS to %i\n", ttl);
963                 ret = setsockopt (ph->fd, IPPROTO_IP, IP_TOS,
964                                 &tos, sizeof (tos));
965         }
966         else if (ph->addrfamily == AF_INET6)
967         {
968                 dprintf ("Setting IPV6_TCLASS to %i\n", ttl);
969                 ret = setsockopt (ph->fd, IPPROTO_IPV6, IPV6_TCLASS,
970                                 &tos, sizeof (tos));
971         }
972
973         return (ret);
974 }
975
976 static int ping_get_ident (void)
977 {
978         int fd;
979         static int did_seed = 0;
980
981         int retval;
982
983         if (did_seed == 0)
984         {
985                 if ((fd = open ("/dev/urandom", O_RDONLY)) != -1)
986                 {
987                         unsigned int seed;
988
989                         if (read (fd, &seed, sizeof (seed)) != -1)
990                         {
991                                 did_seed = 1;
992                                 dprintf ("Random seed:   %#x\n", seed);
993                                 srandom (seed);
994                         }
995
996                         close (fd);
997                 }
998 #if WITH_DEBUG
999                 else
1000                 {
1001                         char errbuf[PING_ERRMSG_LEN];
1002                         dprintf ("open (/dev/urandom): %s\n",
1003                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1004                 }
1005 #endif
1006         }
1007
1008         retval = (int) random ();
1009
1010         dprintf ("Random number: %#x\n", retval);
1011         
1012         return (retval);
1013 }
1014
1015 static pinghost_t *ping_alloc (void)
1016 {
1017         pinghost_t *ph;
1018         size_t      ph_size;
1019
1020         ph_size = sizeof (pinghost_t)
1021                 + sizeof (struct sockaddr_storage)
1022                 + sizeof (struct timeval);
1023
1024         ph = (pinghost_t *) malloc (ph_size);
1025         if (ph == NULL)
1026                 return (NULL);
1027
1028         memset (ph, '\0', ph_size);
1029
1030         ph->timer   = (struct timeval *) (ph + 1);
1031         ph->addr    = (struct sockaddr_storage *) (ph->timer + 1);
1032
1033         ph->addrlen = sizeof (struct sockaddr_storage);
1034         ph->fd      = -1;
1035         ph->latency = -1.0;
1036         ph->dropped = 0;
1037         ph->ident   = ping_get_ident () & 0xFFFF;
1038
1039         return (ph);
1040 }
1041
1042 static void ping_free (pinghost_t *ph)
1043 {
1044         if (ph->fd >= 0)
1045                 close (ph->fd);
1046         
1047         if (ph->username != NULL)
1048                 free (ph->username);
1049
1050         if (ph->hostname != NULL)
1051                 free (ph->hostname);
1052
1053         if (ph->data != NULL)
1054                 free (ph->data);
1055
1056         free (ph);
1057 }
1058
1059 /*
1060  * public methods
1061  */
1062 const char *ping_get_error (pingobj_t *obj)
1063 {
1064         if (obj == NULL)
1065                 return (NULL);
1066         return (obj->errmsg);
1067 }
1068
1069 pingobj_t *ping_construct (void)
1070 {
1071         pingobj_t *obj;
1072
1073         if ((obj = (pingobj_t *) malloc (sizeof (pingobj_t))) == NULL)
1074                 return (NULL);
1075         memset (obj, 0, sizeof (pingobj_t));
1076
1077         obj->timeout    = PING_DEF_TIMEOUT;
1078         obj->ttl        = PING_DEF_TTL;
1079         obj->addrfamily = PING_DEF_AF;
1080         obj->data       = strdup (PING_DEF_DATA);
1081         obj->tos        = 0;
1082
1083         return (obj);
1084 }
1085
1086 void ping_destroy (pingobj_t *obj)
1087 {
1088         pinghost_t *current;
1089         pinghost_t *next;
1090
1091         if (obj == NULL)
1092                 return;
1093
1094         current = obj->head;
1095         next = NULL;
1096
1097         while (current != NULL)
1098         {
1099                 next = current->next;
1100                 ping_free (current);
1101                 current = next;
1102         }
1103
1104         if (obj->data != NULL)
1105                 free (obj->data);
1106
1107         if (obj->srcaddr != NULL)
1108                 free (obj->srcaddr);
1109
1110         if (obj->device != NULL)
1111                 free (obj->device);
1112
1113         free (obj);
1114
1115         return;
1116 }
1117
1118 int ping_setopt (pingobj_t *obj, int option, void *value)
1119 {
1120         int ret = 0;
1121
1122         if ((obj == NULL) || (value == NULL))
1123                 return (-1);
1124
1125         switch (option)
1126         {
1127                 case PING_OPT_TOS:
1128                 {
1129                         pinghost_t *ph;
1130
1131                         obj->tos = *((uint8_t *) value);
1132                         for (ph = obj->head; ph != NULL; ph = ph->next)
1133                                 ping_set_tos (ph, obj->tos);
1134                         break;
1135                 }
1136
1137                 case PING_OPT_TIMEOUT:
1138                         obj->timeout = *((double *) value);
1139                         if (obj->timeout < 0.0)
1140                         {
1141                                 obj->timeout = PING_DEF_TIMEOUT;
1142                                 ret = -1;
1143                         }
1144                         break;
1145
1146                 case PING_OPT_TTL:
1147                         obj->ttl = *((int *) value);
1148                         if ((obj->ttl < 1) || (obj->ttl > 255))
1149                         {
1150                                 obj->ttl = PING_DEF_TTL;
1151                                 ret = -1;
1152                         }
1153                         else
1154                         {
1155                                 pinghost_t *ph;
1156
1157                                 for (ph = obj->head; ph != NULL; ph = ph->next)
1158                                         ping_set_ttl (ph, obj->ttl);
1159                         }
1160                         break;
1161
1162                 case PING_OPT_AF:
1163                         obj->addrfamily = *((int *) value);
1164                         if ((obj->addrfamily != AF_UNSPEC)
1165                                         && (obj->addrfamily != AF_INET)
1166                                         && (obj->addrfamily != AF_INET6))
1167                         {
1168                                 obj->addrfamily = PING_DEF_AF;
1169                                 ret = -1;
1170                         }
1171                         if (obj->srcaddr != NULL)
1172                         {
1173                                 free (obj->srcaddr);
1174                                 obj->srcaddr = NULL;
1175                         }
1176                         break;
1177
1178                 case PING_OPT_DATA:
1179                         if (obj->data != NULL)
1180                         {
1181                                 free (obj->data);
1182                                 obj->data = NULL;
1183                         }
1184                         obj->data = strdup ((const char *) value);
1185                         break;
1186
1187                 case PING_OPT_SOURCE:
1188                 {
1189                         char            *hostname = (char *) value;
1190                         struct addrinfo  ai_hints;
1191                         struct addrinfo *ai_list;
1192                         int              status;
1193 #if WITH_DEBUG
1194                         if (obj->addrfamily != AF_UNSPEC)
1195                         {
1196                                 dprintf ("Resetting obj->addrfamily to AF_UNSPEC.\n");
1197                         }
1198 #endif
1199                         memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
1200                         ai_hints.ai_family = obj->addrfamily = AF_UNSPEC;
1201 #if defined(AI_ADDRCONFIG)
1202                         ai_hints.ai_flags = AI_ADDRCONFIG;
1203 #endif
1204                         status = getaddrinfo (hostname, NULL, &ai_hints, &ai_list);
1205                         if (status != 0)
1206                         {
1207 #if defined(EAI_SYSTEM)
1208                                 char errbuf[PING_ERRMSG_LEN];
1209 #endif
1210                                 ping_set_error (obj, "getaddrinfo",
1211 #if defined(EAI_SYSTEM)
1212                                                 (status == EAI_SYSTEM)
1213                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1214 #endif
1215                                                 gai_strerror (status));
1216                                 ret = -1;
1217                                 break;
1218                         }
1219 #if WITH_DEBUG
1220                         if (ai_list->ai_next != NULL)
1221                         {
1222                                 dprintf ("hostname = `%s' is ambiguous.\n", hostname);
1223                         }
1224 #endif
1225                         if (obj->srcaddr == NULL)
1226                         {
1227                                 obj->srcaddrlen = 0;
1228                                 obj->srcaddr = malloc (sizeof (struct sockaddr_storage));
1229                                 if (obj->srcaddr == NULL)
1230                                 {
1231                                         ping_set_errno (obj, errno);
1232                                         ret = -1;
1233                                         freeaddrinfo (ai_list);
1234                                         break;
1235                                 }
1236                         }
1237                         memset ((void *) obj->srcaddr, 0, sizeof (struct sockaddr_storage));
1238                         assert (ai_list->ai_addrlen <= sizeof (struct sockaddr_storage));
1239                         memcpy ((void *) obj->srcaddr, (const void *) ai_list->ai_addr,
1240                                         ai_list->ai_addrlen);
1241                         obj->srcaddrlen = ai_list->ai_addrlen;
1242                         obj->addrfamily = ai_list->ai_family;
1243
1244                         freeaddrinfo (ai_list);
1245                 } /* case PING_OPT_SOURCE */
1246                 break;
1247
1248                 case PING_OPT_DEVICE:
1249                 {
1250 #ifdef SO_BINDTODEVICE
1251                         char *device = strdup ((char *) value);
1252
1253                         if (device == NULL)
1254                         {
1255                                 ping_set_errno (obj, errno);
1256                                 ret = -1;
1257                                 break;
1258                         }
1259
1260                         if (obj->device != NULL)
1261                                 free (obj->device);
1262                         obj->device = device;
1263 #else /* ! SO_BINDTODEVICE */
1264                         ping_set_errno (obj, ENOTSUP);
1265                         ret = -1;
1266 #endif /* ! SO_BINDTODEVICE */
1267                 } /* case PING_OPT_DEVICE */
1268                 break;
1269
1270                 default:
1271                         ret = -2;
1272         } /* switch (option) */
1273
1274         return (ret);
1275 } /* int ping_setopt */
1276
1277
1278 int ping_send (pingobj_t *obj)
1279 {
1280         int ret;
1281
1282         if (obj == NULL)
1283                 return (-1);
1284
1285         if (ping_send_all (obj) < 0)
1286                 return (-1);
1287
1288         if ((ret = ping_receive_all (obj)) < 0)
1289                 return (-2);
1290
1291         return (ret);
1292 }
1293
1294 static pinghost_t *ping_host_search (pinghost_t *ph, const char *host)
1295 {
1296         while (ph != NULL)
1297         {
1298                 if (strcasecmp (ph->username, host) == 0)
1299                         break;
1300
1301                 ph = ph->next;
1302         }
1303
1304         return (ph);
1305 }
1306
1307 int ping_host_add (pingobj_t *obj, const char *host)
1308 {
1309         pinghost_t *ph;
1310
1311         struct addrinfo  ai_hints;
1312         struct addrinfo *ai_list, *ai_ptr;
1313         int              ai_return;
1314
1315         if ((obj == NULL) || (host == NULL))
1316                 return (-1);
1317
1318         dprintf ("host = %s\n", host);
1319
1320         if (ping_host_search (obj->head, host) != NULL)
1321                 return (0);
1322
1323         memset (&ai_hints, '\0', sizeof (ai_hints));
1324         ai_hints.ai_flags     = 0;
1325 #ifdef AI_ADDRCONFIG
1326         ai_hints.ai_flags    |= AI_ADDRCONFIG;
1327 #endif
1328 #ifdef AI_CANONNAME
1329         ai_hints.ai_flags    |= AI_CANONNAME;
1330 #endif
1331         ai_hints.ai_family    = obj->addrfamily;
1332         ai_hints.ai_socktype  = SOCK_RAW;
1333
1334         if ((ph = ping_alloc ()) == NULL)
1335         {
1336                 dprintf ("Out of memory!\n");
1337                 return (-1);
1338         }
1339
1340         if ((ph->username = strdup (host)) == NULL)
1341         {
1342                 dprintf ("Out of memory!\n");
1343                 ping_set_errno (obj, errno);
1344                 ping_free (ph);
1345                 return (-1);
1346         }
1347
1348         if ((ph->hostname = strdup (host)) == NULL)
1349         {
1350                 dprintf ("Out of memory!\n");
1351                 ping_set_errno (obj, errno);
1352                 ping_free (ph);
1353                 return (-1);
1354         }
1355
1356         /* obj->data is not garuanteed to be != NULL */
1357         if ((ph->data = strdup (obj->data == NULL ? PING_DEF_DATA : obj->data)) == NULL)
1358         {
1359                 dprintf ("Out of memory!\n");
1360                 ping_set_errno (obj, errno);
1361                 ping_free (ph);
1362                 return (-1);
1363         }
1364
1365         if ((ai_return = getaddrinfo (host, NULL, &ai_hints, &ai_list)) != 0)
1366         {
1367 #if defined(EAI_SYSTEM)
1368                 char errbuf[PING_ERRMSG_LEN];
1369 #endif
1370                 dprintf ("getaddrinfo failed\n");
1371                 ping_set_error (obj, "getaddrinfo",
1372 #if defined(EAI_SYSTEM)
1373                                                 (ai_return == EAI_SYSTEM)
1374                                                 ? sstrerror (errno, errbuf, sizeof (errbuf)) :
1375 #endif
1376                                 gai_strerror (ai_return));
1377                 ping_free (ph);
1378                 return (-1);
1379         }
1380
1381         if (ai_list == NULL)
1382                 ping_set_error (obj, "getaddrinfo", "No hosts returned");
1383
1384         for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
1385         {
1386                 ph->fd = -1;
1387
1388                 if (ai_ptr->ai_family == AF_INET)
1389                 {
1390                         ai_ptr->ai_socktype = SOCK_RAW;
1391                         ai_ptr->ai_protocol = IPPROTO_ICMP;
1392                 }
1393                 else if (ai_ptr->ai_family == AF_INET6)
1394                 {
1395                         ai_ptr->ai_socktype = SOCK_RAW;
1396                         ai_ptr->ai_protocol = IPPROTO_ICMPV6;
1397                 }
1398                 else
1399                 {
1400                         char errmsg[PING_ERRMSG_LEN];
1401
1402                         snprintf (errmsg, PING_ERRMSG_LEN, "Unknown `ai_family': %i", ai_ptr->ai_family);
1403                         errmsg[PING_ERRMSG_LEN - 1] = '\0';
1404
1405                         dprintf (errmsg);
1406                         ping_set_error (obj, "getaddrinfo", errmsg);
1407                         continue;
1408                 }
1409
1410                 /* TODO: Move this to a static function `ping_open_socket' and
1411                  * call it whenever the socket dies. */
1412                 ph->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
1413                 if (ph->fd == -1)
1414                 {
1415 #if WITH_DEBUG
1416                         char errbuf[PING_ERRMSG_LEN];
1417                         dprintf ("socket: %s\n",
1418                                         sstrerror (errno, errbuf, sizeof (errbuf)));
1419 #endif
1420                         ping_set_errno (obj, errno);
1421                         continue;
1422                 }
1423
1424                 if (obj->srcaddr != NULL)
1425                 {
1426                         assert (obj->srcaddrlen > 0);
1427                         assert (obj->srcaddrlen <= sizeof (struct sockaddr_storage));
1428
1429                         if (bind (ph->fd, obj->srcaddr, obj->srcaddrlen) == -1)
1430                         {
1431 #if WITH_DEBUG
1432                                 char errbuf[PING_ERRMSG_LEN];
1433                                 dprintf ("bind: %s\n",
1434                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1435 #endif
1436                                 ping_set_errno (obj, errno);
1437                                 close (ph->fd);
1438                                 ph->fd = -1;
1439                                 continue;
1440                         }
1441                 }
1442
1443 #ifdef SO_BINDTODEVICE
1444                 if (obj->device != NULL)
1445                 {
1446                         if (setsockopt (ph->fd, SOL_SOCKET, SO_BINDTODEVICE,
1447                                         obj->device, strlen (obj->device) + 1) != 0)
1448                         {
1449 #if WITH_DEBUG
1450                                 char errbuf[PING_ERRMSG_LEN];
1451                                 dprintf ("setsockopt: %s\n",
1452                                                 sstrerror (errno, errbuf, sizeof (errbuf)));
1453 #endif
1454                                 ping_set_errno (obj, errno);
1455                                 close (ph->fd);
1456                                 ph->fd = -1;
1457                                 continue;
1458                         }
1459                 }
1460 #endif /* SO_BINDTODEVICE */
1461
1462                 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
1463                 memset (ph->addr, '\0', sizeof (struct sockaddr_storage));
1464                 memcpy (ph->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
1465                 ph->addrlen = ai_ptr->ai_addrlen;
1466                 ph->addrfamily = ai_ptr->ai_family;
1467
1468 #ifdef AI_CANONNAME
1469                 if ((ai_ptr->ai_canonname != NULL)
1470                                 && (strcmp (ph->hostname, ai_ptr->ai_canonname) != 0))
1471                 {
1472                         char *old_hostname;
1473
1474                         dprintf ("ph->hostname = %s; ai_ptr->ai_canonname = %s;\n",
1475                                         ph->hostname, ai_ptr->ai_canonname);
1476
1477                         old_hostname = ph->hostname;
1478                         if ((ph->hostname = strdup (ai_ptr->ai_canonname)) == NULL)
1479                         {
1480                                 /* strdup failed, falling back to old hostname */
1481                                 ph->hostname = old_hostname;
1482                         }
1483                         else if (old_hostname != NULL)
1484                         {
1485                                 free (old_hostname);
1486                         }
1487                 }
1488 #endif /* AI_CANONNAME */
1489
1490                 if (ph->addrfamily == AF_INET)
1491                 {
1492                         int opt = 1;
1493
1494                         setsockopt (ph->fd, IPPROTO_IP, IP_RECVTTL,
1495                                         &opt, sizeof (opt));
1496                 }
1497 #if defined(IPPROTO_IPV6) && defined(IPV6_RECVHOPLIMIT)
1498                 else if (ph->addrfamily == AF_INET6)
1499                 {
1500                         int opt = 1;
1501
1502                         setsockopt (ph->fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
1503                                         &opt, sizeof (opt));
1504                 }
1505 #endif
1506
1507                 break;
1508         }
1509
1510         freeaddrinfo (ai_list);
1511
1512         if (ph->fd < 0)
1513         {
1514                 ping_free (ph);
1515                 return (-1);
1516         }
1517
1518         /*
1519          * Adding in the front is much easier, but then the iterator will
1520          * return the host that was added last as first host. That's just not
1521          * nice. -octo
1522          */
1523         if (obj->head == NULL)
1524         {
1525                 obj->head = ph;
1526         }
1527         else
1528         {
1529                 pinghost_t *hptr;
1530
1531                 hptr = obj->head;
1532                 while (hptr->next != NULL)
1533                         hptr = hptr->next;
1534
1535                 assert ((hptr != NULL) && (hptr->next == NULL));
1536                 hptr->next = ph;
1537         }
1538
1539         ping_set_ttl (ph, obj->ttl);
1540         ping_set_tos (ph, obj->tos);
1541
1542         return (0);
1543 } /* int ping_host_add */
1544
1545 int ping_host_remove (pingobj_t *obj, const char *host)
1546 {
1547         pinghost_t *pre, *cur;
1548
1549         if ((obj == NULL) || (host == NULL))
1550                 return (-1);
1551
1552         pre = NULL;
1553         cur = obj->head;
1554
1555         while (cur != NULL)
1556         {
1557                 if (strcasecmp (host, cur->username) == 0)
1558                         break;
1559
1560                 pre = cur;
1561                 cur = cur->next;
1562         }
1563
1564         if (cur == NULL)
1565         {
1566                 ping_set_error (obj, "ping_host_remove", "Host not found");
1567                 return (-1);
1568         }
1569
1570         if (pre == NULL)
1571                 obj->head = cur->next;
1572         else
1573                 pre->next = cur->next;
1574         
1575         ping_free (cur);
1576
1577         return (0);
1578 }
1579
1580 pingobj_iter_t *ping_iterator_get (pingobj_t *obj)
1581 {
1582         if (obj == NULL)
1583                 return (NULL);
1584         return ((pingobj_iter_t *) obj->head);
1585 }
1586
1587 pingobj_iter_t *ping_iterator_next (pingobj_iter_t *iter)
1588 {
1589         if (iter == NULL)
1590                 return (NULL);
1591         return ((pingobj_iter_t *) iter->next);
1592 }
1593
1594 int ping_iterator_get_info (pingobj_iter_t *iter, int info,
1595                 void *buffer, size_t *buffer_len)
1596 {
1597         int ret = EINVAL;
1598
1599         size_t orig_buffer_len = *buffer_len;
1600
1601         if ((iter == NULL) || (buffer_len == NULL))
1602                 return (-1);
1603
1604         if ((buffer == NULL) && (*buffer_len != 0 ))
1605                 return (-1);
1606
1607         switch (info)
1608         {
1609                 case PING_INFO_USERNAME:
1610                         ret = ENOMEM;
1611                         *buffer_len = strlen (iter->username) + 1;
1612                         if (orig_buffer_len <= *buffer_len)
1613                                 break;
1614                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1615                          * will copy `*buffer_len' and pad the rest of
1616                          * `buffer' with null-bytes */
1617                         strncpy (buffer, iter->username, orig_buffer_len);
1618                         ret = 0;
1619                         break;
1620
1621                 case PING_INFO_HOSTNAME:
1622                         ret = ENOMEM;
1623                         *buffer_len = strlen (iter->hostname) + 1;
1624                         if (orig_buffer_len < *buffer_len)
1625                                 break;
1626                         /* Since (orig_buffer_len > *buffer_len) `strncpy'
1627                          * will copy `*buffer_len' and pad the rest of
1628                          * `buffer' with null-bytes */
1629                         strncpy (buffer, iter->hostname, orig_buffer_len);
1630                         ret = 0;
1631                         break;
1632
1633                 case PING_INFO_ADDRESS:
1634                         ret = getnameinfo ((struct sockaddr *) iter->addr,
1635                                         iter->addrlen,
1636                                         (char *) buffer,
1637                                         *buffer_len,
1638                                         NULL, 0,
1639                                         NI_NUMERICHOST);
1640                         if (ret != 0)
1641                         {
1642                                 if ((ret == EAI_MEMORY)
1643 #ifdef EAI_OVERFLOW
1644                                                 || (ret == EAI_OVERFLOW)
1645 #endif
1646                                    )
1647                                         ret = ENOMEM;
1648 #if defined(EAI_SYSTEM)
1649                                 else if (ret == EAI_SYSTEM)
1650                                         ret = errno;
1651 #endif
1652                                 else
1653                                         ret = EINVAL;
1654                         }
1655                         break;
1656
1657                 case PING_INFO_FAMILY:
1658                         ret = ENOMEM;
1659                         *buffer_len = sizeof (int);
1660                         if (orig_buffer_len < sizeof (int))
1661                                 break;
1662                         *((int *) buffer) = iter->addrfamily;
1663                         ret = 0;
1664                         break;
1665
1666                 case PING_INFO_LATENCY:
1667                         ret = ENOMEM;
1668                         *buffer_len = sizeof (double);
1669                         if (orig_buffer_len < sizeof (double))
1670                                 break;
1671                         *((double *) buffer) = iter->latency;
1672                         ret = 0;
1673                         break;
1674
1675                 case PING_INFO_DROPPED:
1676                         ret = ENOMEM;
1677                         *buffer_len = sizeof (uint32_t);
1678                         if (orig_buffer_len < sizeof (uint32_t))
1679                                 break;
1680                         *((uint32_t *) buffer) = iter->dropped;
1681                         ret = 0;
1682                         break;
1683
1684                 case PING_INFO_SEQUENCE:
1685                         ret = ENOMEM;
1686                         *buffer_len = sizeof (unsigned int);
1687                         if (orig_buffer_len < sizeof (unsigned int))
1688                                 break;
1689                         *((unsigned int *) buffer) = (unsigned int) iter->sequence;
1690                         ret = 0;
1691                         break;
1692
1693                 case PING_INFO_IDENT:
1694                         ret = ENOMEM;
1695                         *buffer_len = sizeof (uint16_t);
1696                         if (orig_buffer_len < sizeof (uint16_t))
1697                                 break;
1698                         *((uint16_t *) buffer) = (uint16_t) iter->ident;
1699                         ret = 0;
1700                         break;
1701
1702                 case PING_INFO_DATA:
1703                         ret = ENOMEM;
1704                         *buffer_len = strlen (iter->data);
1705                         if (orig_buffer_len < *buffer_len)
1706                                 break;
1707                         strncpy ((char *) buffer, iter->data, orig_buffer_len);
1708                         ret = 0;
1709                         break;
1710
1711                 case PING_INFO_RECV_TTL:
1712                         ret = ENOMEM;
1713                         *buffer_len = sizeof (int);
1714                         if (orig_buffer_len < sizeof (int))
1715                                 break;
1716                         *((int *) buffer) = iter->recv_ttl;
1717                         ret = 0;
1718                         break;
1719
1720                 case PING_INFO_TOS:
1721                         ret = ENOMEM;
1722                         if (*buffer_len>sizeof(unsigned)) *buffer_len=sizeof(unsigned);
1723                         if (!*buffer_len) *buffer_len=1;
1724                         if (orig_buffer_len < *buffer_len)
1725                                 break;
1726                         memcpy(buffer,&iter->recv_tos,*buffer_len);
1727                         ret = 0;
1728                         break;
1729         }
1730
1731         return (ret);
1732 } /* ping_iterator_get_info */
1733
1734 void *ping_iterator_get_context (pingobj_iter_t *iter)
1735 {
1736         if (iter == NULL)
1737                 return (NULL);
1738         return (iter->context);
1739 }
1740
1741 void ping_iterator_set_context (pingobj_iter_t *iter, void *context)
1742 {
1743         if (iter == NULL)
1744                 return;
1745         iter->context = context;
1746 }