2 * collectd - src/utils_dns.c
3 * Modifications Copyright (C) 2006 Florian octo Forster
4 * Copyright (C) 2002 The Measurement Factory, Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
15 * 3. Neither the name of The Measurement Factory nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 * The Measurement Factory, Inc. <http://www.measurement-factory.com/>
33 * Florian octo Forster <octo at verplant.org>
38 #if HAVE_NETINET_IN_SYSTM_H
39 # include <netinet/in_systm.h>
42 # include <netinet/in.h>
48 # include <arpa/inet.h>
51 #if HAVE_ARPA_NAMESER_H
52 # include <arpa/nameser.h>
53 #elif HAVE_ARPA_NAMESER_COMPAT_H
54 # include <arpa/nameser_compat.h>
58 # include <net/if_arp.h>
63 #if HAVE_NETINET_IF_ETHER_H
64 # include <netinet/if_ether.h>
67 # include <net/if_ppp.h>
71 # include <sys/socket.h>
78 # include <netinet/ip.h>
80 #ifdef HAVE_NETINET_IP_VAR_H
81 # include <netinet/ip_var.h>
83 #if HAVE_NETINET_IP6_H
84 # include <netinet/ip6.h>
86 #if HAVE_NETINET_UDP_H
87 # include <netinet/udp.h>
90 #define PCAP_SNAPLEN 1460
92 #define ETHER_ADDR_LEN 6
93 #define ETHER_TYPE_LEN 2
94 #define ETHER_HDR_LEN (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN)
96 #ifndef ETHERTYPE_8021Q
97 # define ETHERTYPE_8021Q 0x8100
99 #ifndef ETHERTYPE_IPV6
100 # define ETHERTYPE_IPV6 0x86DD
103 #ifndef PPP_ADDRESS_VAL
104 # define PPP_ADDRESS_VAL 0xff /* The address byte value */
106 #ifndef PPP_CONTROL_VAL
107 # define PPP_CONTROL_VAL 0x03 /* The control byte value */
110 #if HAVE_STRUCT_UDPHDR_UH_DPORT && HAVE_STRUCT_UDPHDR_UH_SPORT
111 # define UDP_DEST uh_dport
112 # define UDP_SRC uh_dport
113 #elif HAVE_STRUCT_UDPHDR_DEST && HAVE_STRUCT_UDPHDR_SOURCE
114 # define UDP_DEST dest
115 # define UDP_SRC source
117 # error "`struct udphdr' is unusable."
120 #include "utils_dns.h"
127 struct in6_addr addr;
129 struct ip_list_s *next;
131 typedef struct ip_list_s ip_list_t;
133 typedef int (printer)(const char *, ...);
136 * flags/features for non-interactive mode
149 int qtype_counts[T_MAX];
150 int opcode_counts[OP_MAX];
151 int qclass_counts[C_MAX];
154 static pcap_t *pcap_obj = NULL;
157 static ip_list_t *IgnoreList = NULL;
160 static void (*Callback) (const rfc1035_header_t *) = NULL;
162 static int query_count_intvl = 0;
163 static int query_count_total = 0;
165 static struct bpf_timeval last_ts;
167 static struct timeval last_ts;
168 # endif /* __OpenBSD__ */
169 #endif /* HAVE_PCAP_H */
171 static int cmp_in6_addr (const struct in6_addr *a,
172 const struct in6_addr *b)
176 assert (sizeof (struct in6_addr) == 16);
178 for (i = 0; i < 16; i++)
179 if (a->s6_addr[i] != b->s6_addr[i])
185 return (a->s6_addr[i] > b->s6_addr[i] ? 1 : -1);
186 } /* int cmp_addrinfo */
188 static inline int ignore_list_match (const struct in6_addr *addr)
192 for (ptr = IgnoreList; ptr != NULL; ptr = ptr->next)
193 if (cmp_in6_addr (addr, &ptr->addr) == 0)
196 } /* int ignore_list_match */
198 static void ignore_list_add (const struct in6_addr *addr)
202 if (ignore_list_match (addr) != 0)
205 new = malloc (sizeof (ip_list_t));
212 memcpy (&new->addr, addr, sizeof (struct in6_addr));
213 new->next = IgnoreList;
216 } /* void ignore_list_add */
218 void ignore_list_add_name (const char *name)
220 struct addrinfo *ai_list;
221 struct addrinfo *ai_ptr;
222 struct in6_addr addr;
225 status = getaddrinfo (name, NULL, NULL, &ai_list);
229 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
231 if (ai_ptr->ai_family == AF_INET)
233 memset (&addr, '\0', sizeof (addr));
234 addr.s6_addr[10] = 0xFF;
235 addr.s6_addr[11] = 0xFF;
236 memcpy (addr.s6_addr + 12, &((struct sockaddr_in *) ai_ptr->ai_addr)->sin_addr, 4);
238 ignore_list_add (&addr);
242 ignore_list_add (&((struct sockaddr_in6 *) ai_ptr->ai_addr)->sin6_addr);
246 freeaddrinfo (ai_list);
250 static void in6_addr_from_buffer (struct in6_addr *ia,
251 const void *buf, size_t buf_len,
254 memset (ia, 0, sizeof (struct in6_addr));
255 if ((AF_INET == family) && (sizeof (uint32_t) == buf_len))
257 ia->s6_addr[10] = 0xFF;
258 ia->s6_addr[11] = 0xFF;
259 memcpy (ia->s6_addr + 12, buf, buf_len);
261 else if ((AF_INET6 == family) && (sizeof (struct in6_addr) == buf_len))
263 memcpy (ia, buf, buf_len);
265 } /* void in6_addr_from_buffer */
267 void dnstop_set_pcap_obj (pcap_t *po)
272 void dnstop_set_callback (void (*cb) (const rfc1035_header_t *))
277 #define RFC1035_MAXLABELSZ 63
279 rfc1035NameUnpack(const char *buf, size_t sz, off_t * off, char *name, size_t ns
291 /* blasted compression */
294 memcpy(&s, buf + (*off), sizeof(s));
301 /* Make sure the pointer is inside this message */
304 return rfc1035NameUnpack(buf, sz, &ptr, name + no, ns - no);
305 } else if (c > RFC1035_MAXLABELSZ) {
307 * "(The 10 and 01 combinations are reserved for future use.)"
318 if ((*off) + len > sz) /* message is too short */
320 memcpy(name + no, buf + (*off), len);
323 *(name + (no++)) = '.';
326 *(name + no - 1) = '\0';
327 /* make sure we didn't allow someone to overflow the name buffer */
333 handle_dns(const char *buf, int len,
334 const struct in6_addr *s_addr,
335 const struct in6_addr *d_addr)
343 /* The DNS header is 12 bytes long */
347 memcpy(&us, buf + 0, 2);
350 memcpy(&us, buf + 2, 2);
352 fprintf (stderr, "Bytes 0, 1: 0x%04hx\n", us);
353 qh.qr = (us >> 15) & 0x01;
354 qh.opcode = (us >> 11) & 0x0F;
355 qh.aa = (us >> 10) & 0x01;
356 qh.tc = (us >> 9) & 0x01;
357 qh.rd = (us >> 8) & 0x01;
358 qh.ra = (us >> 7) & 0x01;
359 qh.z = (us >> 6) & 0x01;
360 qh.ad = (us >> 5) & 0x01;
361 qh.cd = (us >> 4) & 0x01;
362 qh.rcode = us & 0x0F;
364 memcpy(&us, buf + 4, 2);
365 qh.qdcount = ntohs(us);
367 memcpy(&us, buf + 6, 2);
368 qh.ancount = ntohs(us);
370 memcpy(&us, buf + 8, 2);
371 qh.nscount = ntohs(us);
373 memcpy(&us, buf + 10, 2);
374 qh.arcount = ntohs(us);
377 memset(qh.qname, '\0', MAX_QNAME_SZ);
378 x = rfc1035NameUnpack(buf, len, &offset, qh.qname, MAX_QNAME_SZ);
381 if ('\0' == qh.qname[0])
382 strcpy(qh.qname, ".");
383 while ((t = strchr(qh.qname, '\n')))
385 while ((t = strchr(qh.qname, '\r')))
387 for (t = qh.qname; *t; t++)
390 memcpy(&us, buf + offset, 2);
391 qh.qtype = ntohs(us);
392 memcpy(&us, buf + offset + 2, 2);
393 qh.qclass = ntohs(us);
395 qh.length = (uint16_t) len;
398 qtype_counts[qh.qtype]++;
399 qclass_counts[qh.qclass]++;
400 opcode_counts[qh.opcode]++;
402 if (Callback != NULL)
409 handle_udp(const struct udphdr *udp, int len,
410 const struct in6_addr *s_addr,
411 const struct in6_addr *d_addr)
413 char buf[PCAP_SNAPLEN];
414 if ((ntohs (udp->UDP_DEST) != 53)
415 && (ntohs (udp->UDP_SRC) != 53))
417 memcpy(buf, udp + 1, len - sizeof(*udp));
418 if (0 == handle_dns(buf, len - sizeof(*udp), s_addr, d_addr))
424 handle_ipv6 (struct ip6_hdr *ipv6, int len)
426 char buf[PCAP_SNAPLEN];
430 struct in6_addr s_addr;
431 struct in6_addr d_addr;
432 uint16_t payload_len;
434 offset = sizeof (struct ip6_hdr);
435 nexthdr = ipv6->ip6_nxt;
436 s_addr = ipv6->ip6_src;
437 d_addr = ipv6->ip6_dst;
438 payload_len = ntohs (ipv6->ip6_plen);
440 if (ignore_list_match (&s_addr))
443 /* Parse extension headers. This only handles the standard headers, as
444 * defined in RFC 2460, correctly. Fragments are discarded. */
445 while ((IPPROTO_ROUTING == nexthdr) /* routing header */
446 || (IPPROTO_HOPOPTS == nexthdr) /* Hop-by-Hop options. */
447 || (IPPROTO_FRAGMENT == nexthdr) /* fragmentation header. */
448 || (IPPROTO_DSTOPTS == nexthdr) /* destination options. */
449 || (IPPROTO_DSTOPTS == nexthdr) /* destination options. */
450 || (IPPROTO_AH == nexthdr) /* destination options. */
451 || (IPPROTO_ESP == nexthdr)) /* encapsulating security payload. */
453 struct ip6_ext ext_hdr;
454 uint16_t ext_hdr_len;
456 /* Catch broken packets */
457 if ((offset + sizeof (struct ip6_ext)) > len)
460 /* Cannot handle fragments. */
461 if (IPPROTO_FRAGMENT == nexthdr)
464 memcpy (&ext_hdr, (char *) ipv6 + offset, sizeof (struct ip6_ext));
465 nexthdr = ext_hdr.ip6e_nxt;
466 ext_hdr_len = (8 * (ntohs (ext_hdr.ip6e_len) + 1));
468 /* This header is longer than the packets payload.. WTF? */
469 if (ext_hdr_len > payload_len)
472 offset += ext_hdr_len;
473 payload_len -= ext_hdr_len;
476 /* Catch broken and empty packets */
477 if (((offset + payload_len) > len)
478 || (payload_len == 0)
479 || (payload_len > PCAP_SNAPLEN))
482 if (IPPROTO_UDP != nexthdr)
485 memcpy (buf, (char *) ipv6 + offset, payload_len);
486 if (handle_udp ((struct udphdr *) buf, payload_len, &s_addr, &d_addr) == 0)
489 return (1); /* Success */
490 } /* int handle_ipv6 */
493 handle_ip(const struct ip *ip, int len)
495 char buf[PCAP_SNAPLEN];
496 int offset = ip->ip_hl << 2;
497 struct in6_addr s_addr;
498 struct in6_addr d_addr;
501 return (handle_ipv6 ((struct ip6_hdr *) ip, len));
503 in6_addr_from_buffer (&s_addr, &ip->ip_src.s_addr, sizeof (ip->ip_src.s_addr), AF_INET);
504 in6_addr_from_buffer (&d_addr, &ip->ip_dst.s_addr, sizeof (ip->ip_dst.s_addr), AF_INET);
505 if (ignore_list_match (&s_addr))
507 if (IPPROTO_UDP != ip->ip_p)
509 memcpy(buf, (void *) ip + offset, len - offset);
510 if (0 == handle_udp((struct udphdr *) buf, len - offset, &s_addr, &d_addr))
515 #if HAVE_NET_IF_PPP_H
517 handle_ppp(const u_char * pkt, int len)
519 char buf[PCAP_SNAPLEN];
521 unsigned short proto;
524 if (*pkt == PPP_ADDRESS_VAL && *(pkt + 1) == PPP_CONTROL_VAL) {
525 pkt += 2; /* ACFC not used */
531 proto = *pkt; /* PFC is used */
535 memcpy(&us, pkt, sizeof(us));
540 if (ETHERTYPE_IP != proto && PPP_IP != proto)
542 memcpy(buf, pkt, len);
543 return handle_ip((struct ip *) buf, len);
545 #endif /* HAVE_NET_IF_PPP_H */
548 handle_null(const u_char * pkt, int len)
551 memcpy(&family, pkt, sizeof(family));
552 if (AF_INET != family)
554 return handle_ip((struct ip *) (pkt + 4), len - 4);
559 handle_loop(const u_char * pkt, int len)
562 memcpy(&family, pkt, sizeof(family));
563 if (AF_INET != ntohl(family))
565 return handle_ip((struct ip *) (pkt + 4), len - 4);
572 handle_raw(const u_char * pkt, int len)
574 return handle_ip((struct ip *) pkt, len);
580 handle_ether(const u_char * pkt, int len)
582 char buf[PCAP_SNAPLEN];
583 struct ether_header *e = (void *) pkt;
584 unsigned short etype = ntohs(e->ether_type);
585 if (len < ETHER_HDR_LEN)
587 pkt += ETHER_HDR_LEN;
588 len -= ETHER_HDR_LEN;
589 if (ETHERTYPE_8021Q == etype) {
590 etype = ntohs(*(unsigned short *) (pkt + 2));
594 if ((ETHERTYPE_IP != etype)
595 && (ETHERTYPE_IPV6 != etype))
597 memcpy(buf, pkt, len);
598 if (ETHERTYPE_IPV6 == etype)
599 return (handle_ipv6 ((struct ip6_hdr *) buf, len));
601 return handle_ip((struct ip *) buf, len);
606 handle_linux_sll (const u_char *pkt, int len)
618 if (len < sizeof (struct sll_header))
621 hdr = (struct sll_header *) pkt;
622 pkt = (u_char *) (hdr + 1);
623 len -= sizeof (struct sll_header);
625 etype = ntohs (hdr->proto_type);
627 if ((ETHERTYPE_IP != etype)
628 && (ETHERTYPE_IPV6 != etype))
631 if (ETHERTYPE_IPV6 == etype)
632 return (handle_ipv6 ((struct ip6_hdr *) pkt, len));
634 return handle_ip((struct ip *) pkt, len);
636 #endif /* DLT_LINUX_SLL */
638 /* public function */
639 void handle_pcap(u_char *udata, const struct pcap_pkthdr *hdr, const u_char *pkt)
643 fprintf (stderr, "handle_pcap (udata = %p, hdr = %p, pkt = %p): hdr->caplen = %i\n",
644 (void *) udata, (void *) hdr, (void *) pkt,
647 if (hdr->caplen < ETHER_HDR_LEN)
650 switch (pcap_datalink (pcap_obj))
653 status = handle_ether (pkt, hdr->caplen);
655 #if HAVE_NET_IF_PPP_H
657 status = handle_ppp (pkt, hdr->caplen);
662 status = handle_loop (pkt, hdr->caplen);
667 status = handle_raw (pkt, hdr->caplen);
672 status = handle_linux_sll (pkt, hdr->caplen);
676 status = handle_null (pkt, hdr->caplen);
680 fprintf (stderr, "unsupported data link type %d\n",
681 pcap_datalink(pcap_obj));
684 } /* switch (pcap_datalink(pcap_obj)) */
693 #endif /* HAVE_PCAP_H */
695 const char *qtype_str(int t)
699 case ns_t_a: return ("A");
700 case ns_t_ns: return ("NS");
701 case ns_t_md: return ("MD");
702 case ns_t_mf: return ("MF");
703 case ns_t_cname: return ("CNAME");
704 case ns_t_soa: return ("SOA");
705 case ns_t_mb: return ("MB");
706 case ns_t_mg: return ("MG");
707 case ns_t_mr: return ("MR");
708 case ns_t_null: return ("NULL");
709 case ns_t_wks: return ("WKS");
710 case ns_t_ptr: return ("PTR");
711 case ns_t_hinfo: return ("HINFO");
712 case ns_t_minfo: return ("MINFO");
713 case ns_t_mx: return ("MX");
714 case ns_t_txt: return ("TXT");
715 case ns_t_rp: return ("RP");
716 case ns_t_afsdb: return ("AFSDB");
717 case ns_t_x25: return ("X25");
718 case ns_t_isdn: return ("ISDN");
719 case ns_t_rt: return ("RT");
720 case ns_t_nsap: return ("NSAP");
721 case ns_t_nsap_ptr: return ("NSAP-PTR");
722 case ns_t_sig: return ("SIG");
723 case ns_t_key: return ("KEY");
724 case ns_t_px: return ("PX");
725 case ns_t_gpos: return ("GPOS");
726 case ns_t_aaaa: return ("AAAA");
727 case ns_t_loc: return ("LOC");
728 case ns_t_nxt: return ("NXT");
729 case ns_t_eid: return ("EID");
730 case ns_t_nimloc: return ("NIMLOC");
731 case ns_t_srv: return ("SRV");
732 case ns_t_atma: return ("ATMA");
733 case ns_t_naptr: return ("NAPTR");
734 case ns_t_kx: return ("KX");
735 case ns_t_cert: return ("CERT");
736 case ns_t_a6: return ("A6");
737 case ns_t_dname: return ("DNAME");
738 case ns_t_sink: return ("SINK");
739 case ns_t_opt: return ("OPT");
740 case ns_t_tsig: return ("TSIG");
741 case ns_t_ixfr: return ("IXFR");
742 case ns_t_axfr: return ("AXFR");
743 case ns_t_mailb: return ("MAILB");
744 case ns_t_maila: return ("MAILA");
745 case ns_t_any: return ("ANY");
746 case ns_t_zxfr: return ("ZXFR");
748 snprintf (buf, 32, "#%i", t);
756 const char *opcode_str (int o)
776 snprintf(buf, 30, "Opcode%d", o);
782 const char *rcode_str (int rcode)
787 case ns_r_noerror: return ("NOERROR");
788 case ns_r_formerr: return ("FORMERR");
789 case ns_r_servfail: return ("SERVFAIL");
790 case ns_r_nxdomain: return ("NXDOMAIN");
791 case ns_r_notimpl: return ("NOTIMPL");
792 case ns_r_refused: return ("REFUSED");
793 case ns_r_yxdomain: return ("YXDOMAIN");
794 case ns_r_yxrrset: return ("YXRRSET");
795 case ns_r_nxrrset: return ("NXRRSET");
796 case ns_r_notauth: return ("NOTAUTH");
797 case ns_r_notzone: return ("NOTZONE");
798 case ns_r_max: return ("MAX");
799 case ns_r_badsig: return ("BADSIG");
800 case ns_r_badkey: return ("BADKEY");
801 case ns_r_badtime: return ("BADTIME");
803 snprintf (buf, 32, "RCode%i", rcode);
809 } /* const char *rcode_str (int rcode) */
813 main(int argc, char *argv[])
815 char errbuf[PCAP_ERRBUF_SIZE];
818 int readfile_state = 0;
819 struct bpf_program fp;
822 SubReport = Sources_report;
823 ignore_addr.s_addr = 0;
824 progname = strdup(strrchr(argv[0], '/') ? strchr(argv[0], '/') + 1 : argv[0]);
828 while ((x = getopt(argc, argv, "ab:f:i:pst")) != -1) {
843 bpf_program_str = strdup(optarg);
846 ignore_addr.s_addr = inet_addr(optarg);
861 device = strdup(argv[0]);
863 if (0 == stat(device, &sb))
865 if (readfile_state) {
866 pcap_obj = pcap_open_offline(device, errbuf);
868 pcap_obj = pcap_open_live(device, PCAP_SNAPLEN, promisc_flag, 1000, errbuf);
870 if (NULL == pcap_obj) {
871 fprintf(stderr, "pcap_open_*: %s\n", errbuf);
875 if (0 == isatty(1)) {
876 if (0 == readfile_state) {
877 fprintf(stderr, "Non-interactive mode requires savefile argument\n");
884 memset(&fp, '\0', sizeof(fp));
885 x = pcap_compile(pcap_obj, &fp, bpf_program_str, 1, 0);
887 fprintf(stderr, "pcap_compile failed\n");
890 x = pcap_setfilter(pcap_obj, &fp);
892 fprintf(stderr, "pcap_setfilter failed\n");
897 * non-blocking call added for Mac OS X bugfix. Sent by Max Horn.
898 * ref http://www.tcpdump.org/lists/workers/2002/09/msg00033.html
900 x = pcap_setnonblock(pcap_obj, 1, errbuf);
902 fprintf(stderr, "pcap_setnonblock failed: %s\n", errbuf);
906 switch (pcap_datalink(pcap_obj)) {
908 handle_datalink = handle_ether;
910 #if HAVE_NET_IF_PPP_H
912 handle_datalink = handle_ppp;
917 handle_datalink = handle_loop;
922 handle_datalink = handle_raw;
926 handle_datalink = handle_null;
929 fprintf(stderr, "unsupported data link type %d\n",
930 pcap_datalink(pcap_obj));
937 if (readfile_state < 2) {
939 * On some OSes select() might return 0 even when
940 * there are packets to process. Thus, we always
941 * ignore its return value and just call pcap_dispatch()
944 if (0 == readfile_state) /* interactive */
945 pcap_select(pcap_obj, 1, 0);
946 x = pcap_dispatch(pcap_obj, 50, handle_pcap, NULL);
948 if (0 == x && 1 == readfile_state) {
949 /* block on keyboard until user quits */
958 endwin(); /* klin, Thu Nov 28 08:56:51 2002 */
960 while (pcap_dispatch(pcap_obj, 50, handle_pcap, NULL))
963 Sources_report(); print_func("\n");
964 Destinatioreport(); print_func("\n");
965 Qtypes_report(); print_func("\n");
966 Opcodes_report(); print_func("\n");
967 Tld_report(); print_func("\n");
968 Sld_report(); print_func("\n");
969 Nld_report(); print_func("\n");
970 SldBySource_report();
973 pcap_close(pcap_obj);
975 } /* static int main(int argc, char *argv[]) */
978 * vim:shiftwidth=4:tabstop=8:softtabstop=4