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Commit | Line | Data |
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aba5acdf SH |
1 | /* |
2 | * arpd.c ARP helper daemon. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <syslog.h> | |
14 | #include <malloc.h> | |
15 | #include <string.h> | |
16 | #include <unistd.h> | |
17 | #include <stdlib.h> | |
18 | #include <netdb.h> | |
16efac57 | 19 | #include <db_185.h> |
aba5acdf SH |
20 | #include <sys/ioctl.h> |
21 | #include <sys/poll.h> | |
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <sys/uio.h> | |
25 | #include <sys/socket.h> | |
26 | #include <sys/time.h> | |
27 | #include <time.h> | |
28 | #include <signal.h> | |
29 | #include <linux/if.h> | |
17ce7fd5 | 30 | #include <linux/if_ether.h> |
aba5acdf SH |
31 | #include <linux/if_arp.h> |
32 | #include <netinet/in.h> | |
33 | #include <arpa/inet.h> | |
34 | #include <linux/if_packet.h> | |
35 | #include <linux/filter.h> | |
36 | ||
37 | #include "libnetlink.h" | |
38 | #include "utils.h" | |
dd50247d | 39 | #include "rt_names.h" |
aba5acdf SH |
40 | |
41 | int resolve_hosts; | |
42 | ||
43 | DB *dbase; | |
44 | char *dbname = "/var/lib/arpd/arpd.db"; | |
45 | ||
ae665a52 | 46 | int ifnum; |
aba5acdf SH |
47 | int *ifvec; |
48 | char **ifnames; | |
49 | ||
acd1e437 | 50 | struct dbkey { |
aba5acdf SH |
51 | __u32 iface; |
52 | __u32 addr; | |
53 | }; | |
54 | ||
acd1e437 | 55 | #define IS_NEG(x) (((__u8 *)(x))[0] == 0xFF) |
ae665a52 | 56 | #define NEG_TIME(x) (((x)[2]<<24)|((x)[3]<<16)|((x)[4]<<8)|(x)[5]) |
acd1e437 | 57 | #define NEG_AGE(x) ((__u32)time(NULL) - NEG_TIME((__u8 *)x)) |
aba5acdf | 58 | #define NEG_VALID(x) (NEG_AGE(x) < negative_timeout) |
acd1e437 | 59 | #define NEG_CNT(x) (((__u8 *)(x))[1]) |
aba5acdf SH |
60 | |
61 | struct rtnl_handle rth; | |
62 | ||
63 | struct pollfd pset[2]; | |
64 | int udp_sock = -1; | |
65 | ||
66 | volatile int do_exit; | |
67 | volatile int do_sync; | |
68 | volatile int do_stats; | |
69 | ||
70 | struct { | |
71 | unsigned long arp_new; | |
72 | unsigned long arp_change; | |
73 | ||
74 | unsigned long app_recv; | |
75 | unsigned long app_success; | |
76 | unsigned long app_bad; | |
77 | unsigned long app_neg; | |
78 | unsigned long app_suppressed; | |
79 | ||
80 | unsigned long kern_neg; | |
81 | unsigned long kern_new; | |
82 | unsigned long kern_change; | |
83 | ||
84 | unsigned long probes_sent; | |
85 | unsigned long probes_suppressed; | |
86 | } stats; | |
87 | ||
88 | int active_probing; | |
89 | int negative_timeout = 60; | |
90 | int no_kernel_broadcasts; | |
91 | int broadcast_rate = 1000; | |
92 | int broadcast_burst = 3000; | |
0df7db3c | 93 | int poll_timeout = 30000; |
aba5acdf | 94 | |
d1f28cf1 | 95 | static void usage(void) |
aba5acdf SH |
96 | { |
97 | fprintf(stderr, | |
acd1e437 | 98 | "Usage: arpd [ -lkh? ] [ -a N ] [ -b dbase ] [ -B number ] [ -f file ] [ -n time ] [-p interval ] [ -R rate ] [ interfaces ]\n"); |
aba5acdf SH |
99 | exit(1); |
100 | } | |
101 | ||
d1f28cf1 | 102 | static int handle_if(int ifindex) |
aba5acdf SH |
103 | { |
104 | int i; | |
105 | ||
106 | if (ifnum == 0) | |
107 | return 1; | |
108 | ||
acd1e437 | 109 | for (i = 0; i < ifnum; i++) |
aba5acdf SH |
110 | if (ifvec[i] == ifindex) |
111 | return 1; | |
112 | return 0; | |
113 | } | |
114 | ||
115 | int sysctl_adjusted; | |
116 | ||
d1f28cf1 | 117 | static void do_sysctl_adjustments(void) |
aba5acdf SH |
118 | { |
119 | int i; | |
120 | ||
121 | if (!ifnum) | |
122 | return; | |
123 | ||
acd1e437 | 124 | for (i = 0; i < ifnum; i++) { |
aba5acdf SH |
125 | char buf[128]; |
126 | FILE *fp; | |
127 | ||
128 | if (active_probing) { | |
129 | sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/mcast_solicit", ifnames[i]); | |
130 | if ((fp = fopen(buf, "w")) != NULL) { | |
131 | if (no_kernel_broadcasts) | |
132 | strcpy(buf, "0\n"); | |
133 | else | |
acd1e437 | 134 | sprintf(buf, "%d\n", active_probing >= 2 ? 1 : 3-active_probing); |
aba5acdf SH |
135 | fputs(buf, fp); |
136 | fclose(fp); | |
137 | } | |
138 | } | |
139 | ||
140 | sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/app_solicit", ifnames[i]); | |
141 | if ((fp = fopen(buf, "w")) != NULL) { | |
acd1e437 | 142 | sprintf(buf, "%d\n", active_probing <= 1 ? 1 : active_probing); |
aba5acdf SH |
143 | fputs(buf, fp); |
144 | fclose(fp); | |
145 | } | |
146 | } | |
147 | sysctl_adjusted = 1; | |
148 | } | |
149 | ||
d1f28cf1 | 150 | static void undo_sysctl_adjustments(void) |
aba5acdf SH |
151 | { |
152 | int i; | |
153 | ||
154 | if (!sysctl_adjusted) | |
155 | return; | |
156 | ||
acd1e437 | 157 | for (i = 0; i < ifnum; i++) { |
aba5acdf SH |
158 | char buf[128]; |
159 | FILE *fp; | |
160 | ||
161 | if (active_probing) { | |
162 | sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/mcast_solicit", ifnames[i]); | |
163 | if ((fp = fopen(buf, "w")) != NULL) { | |
164 | strcpy(buf, "3\n"); | |
165 | fputs(buf, fp); | |
166 | fclose(fp); | |
167 | } | |
168 | } | |
169 | sprintf(buf, "/proc/sys/net/ipv4/neigh/%s/app_solicit", ifnames[i]); | |
170 | if ((fp = fopen(buf, "w")) != NULL) { | |
171 | strcpy(buf, "0\n"); | |
172 | fputs(buf, fp); | |
173 | fclose(fp); | |
174 | } | |
175 | } | |
176 | sysctl_adjusted = 0; | |
177 | } | |
178 | ||
179 | ||
d1f28cf1 | 180 | static int send_probe(int ifindex, __u32 addr) |
aba5acdf | 181 | { |
d17b136f PS |
182 | struct ifreq ifr = { .ifr_ifindex = ifindex }; |
183 | struct sockaddr_in dst = { | |
184 | .sin_family = AF_INET, | |
185 | .sin_port = htons(1025), | |
186 | .sin_addr.s_addr = addr, | |
187 | }; | |
f332d169 | 188 | socklen_t len; |
aba5acdf | 189 | unsigned char buf[256]; |
acd1e437 | 190 | struct arphdr *ah = (struct arphdr *)buf; |
aba5acdf | 191 | unsigned char *p = (unsigned char *)(ah+1); |
d17b136f PS |
192 | struct sockaddr_ll sll = { |
193 | .sll_family = AF_PACKET, | |
194 | .sll_ifindex = ifindex, | |
195 | .sll_protocol = htons(ETH_P_ARP), | |
196 | }; | |
aba5acdf | 197 | |
aba5acdf SH |
198 | if (ioctl(udp_sock, SIOCGIFNAME, &ifr)) |
199 | return -1; | |
200 | if (ioctl(udp_sock, SIOCGIFHWADDR, &ifr)) | |
201 | return -1; | |
202 | if (ifr.ifr_hwaddr.sa_family != ARPHRD_ETHER) | |
203 | return -1; | |
204 | if (setsockopt(udp_sock, SOL_SOCKET, SO_BINDTODEVICE, ifr.ifr_name, strlen(ifr.ifr_name)+1) < 0) | |
205 | return -1; | |
206 | ||
acd1e437 | 207 | if (connect(udp_sock, (struct sockaddr *)&dst, sizeof(dst)) < 0) |
aba5acdf SH |
208 | return -1; |
209 | len = sizeof(dst); | |
acd1e437 | 210 | if (getsockname(udp_sock, (struct sockaddr *)&dst, &len) < 0) |
aba5acdf SH |
211 | return -1; |
212 | ||
213 | ah->ar_hrd = htons(ifr.ifr_hwaddr.sa_family); | |
214 | ah->ar_pro = htons(ETH_P_IP); | |
215 | ah->ar_hln = 6; | |
216 | ah->ar_pln = 4; | |
217 | ah->ar_op = htons(ARPOP_REQUEST); | |
218 | ||
219 | memcpy(p, ifr.ifr_hwaddr.sa_data, ah->ar_hln); | |
220 | p += ah->ar_hln; | |
221 | ||
222 | memcpy(p, &dst.sin_addr, 4); | |
acd1e437 | 223 | p += 4; |
aba5acdf | 224 | |
aba5acdf | 225 | memset(sll.sll_addr, 0xFF, sizeof(sll.sll_addr)); |
aba5acdf | 226 | memcpy(p, &sll.sll_addr, ah->ar_hln); |
acd1e437 | 227 | p += ah->ar_hln; |
aba5acdf SH |
228 | |
229 | memcpy(p, &addr, 4); | |
acd1e437 | 230 | p += 4; |
aba5acdf | 231 | |
acd1e437 | 232 | if (sendto(pset[0].fd, buf, p-buf, 0, (struct sockaddr *)&sll, sizeof(sll)) < 0) |
aba5acdf SH |
233 | return -1; |
234 | stats.probes_sent++; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | /* Be very tough on sending probes: 1 per second with burst of 3. */ | |
239 | ||
d1f28cf1 | 240 | static int queue_active_probe(int ifindex, __u32 addr) |
aba5acdf SH |
241 | { |
242 | static struct timeval prev; | |
243 | static int buckets; | |
244 | struct timeval now; | |
245 | ||
246 | gettimeofday(&now, NULL); | |
247 | if (prev.tv_sec) { | |
248 | int diff = (now.tv_sec-prev.tv_sec)*1000+(now.tv_usec-prev.tv_usec)/1000; | |
acd1e437 | 249 | |
aba5acdf SH |
250 | buckets += diff; |
251 | } else { | |
252 | buckets = broadcast_burst; | |
253 | } | |
254 | if (buckets > broadcast_burst) | |
255 | buckets = broadcast_burst; | |
256 | if (buckets >= broadcast_rate && !send_probe(ifindex, addr)) { | |
257 | buckets -= broadcast_rate; | |
258 | prev = now; | |
259 | return 0; | |
260 | } | |
261 | stats.probes_suppressed++; | |
262 | return -1; | |
263 | } | |
264 | ||
d1f28cf1 | 265 | static int respond_to_kernel(int ifindex, __u32 addr, char *lla, int llalen) |
aba5acdf SH |
266 | { |
267 | struct { | |
acd1e437 SH |
268 | struct nlmsghdr n; |
269 | struct ndmsg ndm; | |
270 | char buf[256]; | |
d17b136f PS |
271 | } req = { |
272 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)), | |
273 | .n.nlmsg_flags = NLM_F_REQUEST, | |
274 | .n.nlmsg_type = RTM_NEWNEIGH, | |
275 | .ndm.ndm_family = AF_INET, | |
276 | .ndm.ndm_state = NUD_STALE, | |
277 | .ndm.ndm_ifindex = ifindex, | |
278 | .ndm.ndm_type = RTN_UNICAST, | |
279 | }; | |
aba5acdf SH |
280 | |
281 | addattr_l(&req.n, sizeof(req), NDA_DST, &addr, 4); | |
282 | addattr_l(&req.n, sizeof(req), NDA_LLADDR, lla, llalen); | |
6cf8398f | 283 | return rtnl_send(&rth, &req, req.n.nlmsg_len) <= 0; |
aba5acdf SH |
284 | } |
285 | ||
d1f28cf1 | 286 | static void prepare_neg_entry(__u8 *ndata, __u32 stamp) |
aba5acdf SH |
287 | { |
288 | ndata[0] = 0xFF; | |
289 | ndata[1] = 0; | |
290 | ndata[2] = stamp>>24; | |
291 | ndata[3] = stamp>>16; | |
292 | ndata[4] = stamp>>8; | |
293 | ndata[5] = stamp; | |
294 | } | |
295 | ||
296 | ||
d1f28cf1 | 297 | static int do_one_request(struct nlmsghdr *n) |
aba5acdf SH |
298 | { |
299 | struct ndmsg *ndm = NLMSG_DATA(n); | |
300 | int len = n->nlmsg_len; | |
acd1e437 | 301 | struct rtattr *tb[NDA_MAX+1]; |
aba5acdf SH |
302 | struct dbkey key; |
303 | DBT dbkey, dbdat; | |
304 | int do_acct = 0; | |
305 | ||
306 | if (n->nlmsg_type == NLMSG_DONE) { | |
307 | dbase->sync(dbase, 0); | |
308 | ||
309 | /* Now we have at least mirror of kernel db, so that | |
310 | * may start real resolution. | |
311 | */ | |
312 | do_sysctl_adjustments(); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | if (n->nlmsg_type != RTM_GETNEIGH && n->nlmsg_type != RTM_NEWNEIGH) | |
317 | return 0; | |
318 | ||
319 | len -= NLMSG_LENGTH(sizeof(*ndm)); | |
320 | if (len < 0) | |
321 | return -1; | |
322 | ||
323 | if (ndm->ndm_family != AF_INET || | |
324 | (ifnum && !handle_if(ndm->ndm_ifindex)) || | |
325 | ndm->ndm_flags || | |
326 | ndm->ndm_type != RTN_UNICAST || | |
327 | !(ndm->ndm_state&~NUD_NOARP)) | |
328 | return 0; | |
329 | ||
aba5acdf SH |
330 | parse_rtattr(tb, NDA_MAX, NDA_RTA(ndm), len); |
331 | ||
332 | if (!tb[NDA_DST]) | |
333 | return 0; | |
334 | ||
335 | key.iface = ndm->ndm_ifindex; | |
336 | memcpy(&key.addr, RTA_DATA(tb[NDA_DST]), 4); | |
337 | dbkey.data = &key; | |
338 | dbkey.size = sizeof(key); | |
339 | ||
340 | if (dbase->get(dbase, &dbkey, &dbdat, 0) != 0) { | |
341 | dbdat.data = 0; | |
342 | dbdat.size = 0; | |
343 | } | |
344 | ||
345 | if (n->nlmsg_type == RTM_GETNEIGH) { | |
346 | if (!(n->nlmsg_flags&NLM_F_REQUEST)) | |
347 | return 0; | |
348 | ||
349 | if (!(ndm->ndm_state&(NUD_PROBE|NUD_INCOMPLETE))) { | |
350 | stats.app_bad++; | |
351 | return 0; | |
352 | } | |
353 | ||
354 | if (ndm->ndm_state&NUD_PROBE) { | |
355 | /* If we get this, kernel still has some valid | |
356 | * address, but unicast probing failed and host | |
357 | * is either dead or changed its mac address. | |
358 | * Kernel is going to initiate broadcast resolution. | |
359 | * OK, we invalidate our information as well. | |
360 | */ | |
361 | if (dbdat.data && !IS_NEG(dbdat.data)) | |
362 | stats.app_neg++; | |
363 | ||
364 | dbase->del(dbase, &dbkey, 0); | |
365 | } else { | |
366 | /* If we get this kernel does not have any information. | |
367 | * If we have something tell this to kernel. */ | |
368 | stats.app_recv++; | |
369 | if (dbdat.data && !IS_NEG(dbdat.data)) { | |
370 | stats.app_success++; | |
371 | respond_to_kernel(key.iface, key.addr, dbdat.data, dbdat.size); | |
372 | return 0; | |
373 | } | |
374 | ||
375 | /* Sheeit! We have nothing to tell. */ | |
376 | /* If we have recent negative entry, be silent. */ | |
377 | if (dbdat.data && NEG_VALID(dbdat.data)) { | |
378 | if (NEG_CNT(dbdat.data) >= active_probing) { | |
379 | stats.app_suppressed++; | |
380 | return 0; | |
381 | } | |
382 | do_acct = 1; | |
383 | } | |
384 | } | |
385 | ||
386 | if (active_probing && | |
387 | queue_active_probe(ndm->ndm_ifindex, key.addr) == 0 && | |
388 | do_acct) { | |
389 | NEG_CNT(dbdat.data)++; | |
390 | dbase->put(dbase, &dbkey, &dbdat, 0); | |
391 | } | |
392 | } else if (n->nlmsg_type == RTM_NEWNEIGH) { | |
393 | if (n->nlmsg_flags&NLM_F_REQUEST) | |
394 | return 0; | |
395 | ||
396 | if (ndm->ndm_state&NUD_FAILED) { | |
397 | /* Kernel was not able to resolve. Host is dead. | |
398 | * Create negative entry if it is not present | |
399 | * or renew it if it is too old. */ | |
400 | if (!dbdat.data || | |
401 | !IS_NEG(dbdat.data) || | |
402 | !NEG_VALID(dbdat.data)) { | |
403 | __u8 ndata[6]; | |
acd1e437 | 404 | |
aba5acdf SH |
405 | stats.kern_neg++; |
406 | prepare_neg_entry(ndata, time(NULL)); | |
407 | dbdat.data = ndata; | |
408 | dbdat.size = sizeof(ndata); | |
409 | dbase->put(dbase, &dbkey, &dbdat, 0); | |
410 | } | |
411 | } else if (tb[NDA_LLADDR]) { | |
412 | if (dbdat.data && !IS_NEG(dbdat.data)) { | |
413 | if (memcmp(RTA_DATA(tb[NDA_LLADDR]), dbdat.data, dbdat.size) == 0) | |
414 | return 0; | |
415 | stats.kern_change++; | |
416 | } else { | |
417 | stats.kern_new++; | |
418 | } | |
419 | dbdat.data = RTA_DATA(tb[NDA_LLADDR]); | |
420 | dbdat.size = RTA_PAYLOAD(tb[NDA_LLADDR]); | |
421 | dbase->put(dbase, &dbkey, &dbdat, 0); | |
422 | } | |
423 | } | |
424 | return 0; | |
425 | } | |
426 | ||
d1f28cf1 | 427 | static void load_initial_table(void) |
aba5acdf | 428 | { |
d2468da0 SH |
429 | if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETNEIGH) < 0) { |
430 | perror("dump request failed"); | |
431 | exit(1); | |
432 | } | |
3d0b7439 | 433 | |
aba5acdf SH |
434 | } |
435 | ||
d1f28cf1 | 436 | static void get_kern_msg(void) |
aba5acdf SH |
437 | { |
438 | int status; | |
439 | struct nlmsghdr *h; | |
d17b136f | 440 | struct sockaddr_nl nladdr = {}; |
aba5acdf SH |
441 | struct iovec iov; |
442 | char buf[8192]; | |
443 | struct msghdr msg = { | |
acd1e437 | 444 | (void *)&nladdr, sizeof(nladdr), |
aba5acdf SH |
445 | &iov, 1, |
446 | NULL, 0, | |
447 | 0 | |
448 | }; | |
449 | ||
aba5acdf SH |
450 | iov.iov_base = buf; |
451 | iov.iov_len = sizeof(buf); | |
452 | ||
453 | status = recvmsg(rth.fd, &msg, MSG_DONTWAIT); | |
454 | ||
455 | if (status <= 0) | |
456 | return; | |
457 | ||
458 | if (msg.msg_namelen != sizeof(nladdr)) | |
459 | return; | |
460 | ||
461 | if (nladdr.nl_pid) | |
462 | return; | |
463 | ||
acd1e437 | 464 | for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) { |
aba5acdf SH |
465 | int len = h->nlmsg_len; |
466 | int l = len - sizeof(*h); | |
467 | ||
468 | if (l < 0 || len > status) | |
469 | return; | |
470 | ||
471 | if (do_one_request(h) < 0) | |
472 | return; | |
473 | ||
474 | status -= NLMSG_ALIGN(len); | |
acd1e437 | 475 | h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len)); |
aba5acdf SH |
476 | } |
477 | } | |
478 | ||
479 | /* Receive gratuitous ARP messages and store them, that's all. */ | |
d1f28cf1 | 480 | static void get_arp_pkt(void) |
aba5acdf SH |
481 | { |
482 | unsigned char buf[1024]; | |
483 | struct sockaddr_ll sll; | |
f332d169 | 484 | socklen_t sll_len = sizeof(sll); |
acd1e437 | 485 | struct arphdr *a = (struct arphdr *)buf; |
aba5acdf SH |
486 | struct dbkey key; |
487 | DBT dbkey, dbdat; | |
488 | int n; | |
489 | ||
ae665a52 | 490 | n = recvfrom(pset[0].fd, buf, sizeof(buf), MSG_DONTWAIT, |
acd1e437 | 491 | (struct sockaddr *)&sll, &sll_len); |
aba5acdf SH |
492 | if (n < 0) { |
493 | if (errno != EINTR && errno != EAGAIN) | |
494 | syslog(LOG_ERR, "recvfrom: %m"); | |
495 | return; | |
496 | } | |
497 | ||
498 | if (ifnum && !handle_if(sll.sll_ifindex)) | |
499 | return; | |
500 | ||
501 | /* Sanity checks */ | |
502 | ||
503 | if (n < sizeof(*a) || | |
504 | (a->ar_op != htons(ARPOP_REQUEST) && | |
505 | a->ar_op != htons(ARPOP_REPLY)) || | |
506 | a->ar_pln != 4 || | |
507 | a->ar_pro != htons(ETH_P_IP) || | |
508 | a->ar_hln != sll.sll_halen || | |
509 | sizeof(*a) + 2*4 + 2*a->ar_hln > n) | |
510 | return; | |
511 | ||
512 | key.iface = sll.sll_ifindex; | |
acd1e437 | 513 | memcpy(&key.addr, (char *)(a+1) + a->ar_hln, 4); |
aba5acdf | 514 | |
ae665a52 | 515 | /* DAD message, ignore. */ |
aba5acdf SH |
516 | if (key.addr == 0) |
517 | return; | |
518 | ||
519 | dbkey.data = &key; | |
520 | dbkey.size = sizeof(key); | |
521 | ||
522 | if (dbase->get(dbase, &dbkey, &dbdat, 0) == 0 && !IS_NEG(dbdat.data)) { | |
523 | if (memcmp(dbdat.data, a+1, dbdat.size) == 0) | |
524 | return; | |
525 | stats.arp_change++; | |
526 | } else { | |
527 | stats.arp_new++; | |
528 | } | |
529 | ||
530 | dbdat.data = a+1; | |
531 | dbdat.size = a->ar_hln; | |
532 | dbase->put(dbase, &dbkey, &dbdat, 0); | |
533 | } | |
534 | ||
d1f28cf1 | 535 | static void catch_signal(int sig, void (*handler)(int)) |
aba5acdf | 536 | { |
d17b136f | 537 | struct sigaction sa = { .sa_handler = handler }; |
aba5acdf | 538 | |
aba5acdf SH |
539 | #ifdef SA_INTERRUPT |
540 | sa.sa_flags = SA_INTERRUPT; | |
ae665a52 | 541 | #endif |
aba5acdf SH |
542 | sigaction(sig, &sa, NULL); |
543 | } | |
544 | ||
545 | #include <setjmp.h> | |
546 | sigjmp_buf env; | |
547 | volatile int in_poll; | |
548 | ||
d1f28cf1 | 549 | static void sig_exit(int signo) |
aba5acdf SH |
550 | { |
551 | do_exit = 1; | |
552 | if (in_poll) | |
553 | siglongjmp(env, 1); | |
554 | } | |
555 | ||
d1f28cf1 | 556 | static void sig_sync(int signo) |
aba5acdf SH |
557 | { |
558 | do_sync = 1; | |
559 | if (in_poll) | |
560 | siglongjmp(env, 1); | |
561 | } | |
562 | ||
d1f28cf1 | 563 | static void sig_stats(int signo) |
aba5acdf SH |
564 | { |
565 | do_sync = 1; | |
566 | do_stats = 1; | |
567 | if (in_poll) | |
568 | siglongjmp(env, 1); | |
569 | } | |
570 | ||
d1f28cf1 | 571 | static void send_stats(void) |
aba5acdf SH |
572 | { |
573 | syslog(LOG_INFO, "arp_rcv: n%lu c%lu app_rcv: tot %lu hits %lu bad %lu neg %lu sup %lu", | |
574 | stats.arp_new, stats.arp_change, | |
575 | ||
576 | stats.app_recv, stats.app_success, | |
577 | stats.app_bad, stats.app_neg, stats.app_suppressed | |
578 | ); | |
579 | syslog(LOG_INFO, "kern: n%lu c%lu neg %lu arp_send: %lu rlim %lu", | |
580 | stats.kern_new, stats.kern_change, stats.kern_neg, | |
581 | ||
582 | stats.probes_sent, stats.probes_suppressed | |
583 | ); | |
584 | do_stats = 0; | |
585 | } | |
586 | ||
587 | ||
588 | int main(int argc, char **argv) | |
589 | { | |
590 | int opt; | |
591 | int do_list = 0; | |
592 | char *do_load = NULL; | |
593 | ||
0df7db3c | 594 | while ((opt = getopt(argc, argv, "h?b:lf:a:n:p:kR:B:")) != EOF) { |
aba5acdf | 595 | switch (opt) { |
acd1e437 | 596 | case 'b': |
aba5acdf SH |
597 | dbname = optarg; |
598 | break; | |
599 | case 'f': | |
600 | if (do_load) { | |
601 | fprintf(stderr, "Duplicate option -f\n"); | |
602 | usage(); | |
603 | } | |
604 | do_load = optarg; | |
605 | break; | |
606 | case 'l': | |
607 | do_list = 1; | |
608 | break; | |
609 | case 'a': | |
610 | active_probing = atoi(optarg); | |
611 | break; | |
612 | case 'n': | |
613 | negative_timeout = atoi(optarg); | |
614 | break; | |
615 | case 'k': | |
616 | no_kernel_broadcasts = 1; | |
617 | break; | |
0df7db3c SH |
618 | case 'p': |
619 | if ((poll_timeout = 1000 * strtod(optarg, NULL)) < 100) { | |
acd1e437 | 620 | fprintf(stderr, "Invalid poll timeout\n"); |
0df7db3c SH |
621 | exit(-1); |
622 | } | |
623 | break; | |
aba5acdf SH |
624 | case 'R': |
625 | if ((broadcast_rate = atoi(optarg)) <= 0 || | |
626 | (broadcast_rate = 1000/broadcast_rate) <= 0) { | |
627 | fprintf(stderr, "Invalid ARP rate\n"); | |
628 | exit(-1); | |
629 | } | |
630 | break; | |
631 | case 'B': | |
632 | if ((broadcast_burst = atoi(optarg)) <= 0 || | |
633 | (broadcast_burst = 1000*broadcast_burst) <= 0) { | |
634 | fprintf(stderr, "Invalid ARP burst\n"); | |
635 | exit(-1); | |
636 | } | |
637 | break; | |
638 | case 'h': | |
639 | case '?': | |
640 | default: | |
641 | usage(); | |
642 | } | |
643 | } | |
644 | argc -= optind; | |
645 | argv += optind; | |
646 | ||
647 | if (argc > 0) { | |
648 | ifnum = argc; | |
649 | ifnames = argv; | |
650 | ifvec = malloc(argc*sizeof(int)); | |
651 | if (!ifvec) { | |
652 | perror("malloc"); | |
653 | exit(-1); | |
654 | } | |
655 | } | |
656 | ||
657 | if ((udp_sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { | |
658 | perror("socket"); | |
659 | exit(-1); | |
660 | } | |
661 | ||
acd1e437 | 662 | if (ifnum) { |
aba5acdf | 663 | int i; |
d17b136f | 664 | struct ifreq ifr = {}; |
acd1e437 | 665 | |
acd1e437 | 666 | for (i = 0; i < ifnum; i++) { |
aba5acdf SH |
667 | strncpy(ifr.ifr_name, ifnames[i], IFNAMSIZ); |
668 | if (ioctl(udp_sock, SIOCGIFINDEX, &ifr)) { | |
669 | perror("ioctl(SIOCGIFINDEX)"); | |
acd1e437 | 670 | exit(-1); |
aba5acdf SH |
671 | } |
672 | ifvec[i] = ifr.ifr_ifindex; | |
673 | } | |
674 | } | |
675 | ||
676 | dbase = dbopen(dbname, O_CREAT|O_RDWR, 0644, DB_HASH, NULL); | |
677 | if (dbase == NULL) { | |
678 | perror("db_open"); | |
679 | exit(-1); | |
680 | } | |
681 | ||
682 | if (do_load) { | |
683 | char buf[128]; | |
684 | FILE *fp; | |
685 | struct dbkey k; | |
686 | DBT dbkey, dbdat; | |
687 | ||
688 | dbkey.data = &k; | |
689 | dbkey.size = sizeof(k); | |
690 | ||
691 | if (strcmp(do_load, "-") == 0 || strcmp(do_load, "--") == 0) { | |
692 | fp = stdin; | |
693 | } else if ((fp = fopen(do_load, "r")) == NULL) { | |
694 | perror("fopen"); | |
695 | goto do_abort; | |
696 | } | |
697 | ||
698 | buf[sizeof(buf)-1] = 0; | |
61170fd8 | 699 | while (fgets(buf, sizeof(buf), fp)) { |
aba5acdf SH |
700 | __u8 b1[6]; |
701 | char ipbuf[128]; | |
702 | char macbuf[128]; | |
703 | ||
704 | if (buf[0] == '#') | |
705 | continue; | |
706 | ||
707 | if (sscanf(buf, "%u%s%s", &k.iface, ipbuf, macbuf) != 3) { | |
708 | fprintf(stderr, "Wrong format of input file \"%s\"\n", do_load); | |
709 | goto do_abort; | |
710 | } | |
711 | if (strncmp(macbuf, "FAILED:", 7) == 0) | |
712 | continue; | |
acd1e437 | 713 | if (!inet_aton(ipbuf, (struct in_addr *)&k.addr)) { |
aba5acdf SH |
714 | fprintf(stderr, "Invalid IP address: \"%s\"\n", ipbuf); |
715 | goto do_abort; | |
716 | } | |
f332d169 | 717 | |
dd50247d | 718 | if (ll_addr_a2n((char *) b1, 6, macbuf) != 6) |
aba5acdf SH |
719 | goto do_abort; |
720 | dbdat.size = 6; | |
721 | ||
722 | if (dbase->put(dbase, &dbkey, &dbdat, 0)) { | |
723 | perror("hash->put"); | |
724 | goto do_abort; | |
725 | } | |
726 | } | |
727 | dbase->sync(dbase, 0); | |
728 | if (fp != stdin) | |
729 | fclose(fp); | |
730 | } | |
731 | ||
732 | if (do_list) { | |
733 | DBT dbkey, dbdat; | |
acd1e437 | 734 | |
aba5acdf SH |
735 | printf("%-8s %-15s %s\n", "#Ifindex", "IP", "MAC"); |
736 | while (dbase->seq(dbase, &dbkey, &dbdat, R_NEXT) == 0) { | |
ae665a52 | 737 | struct dbkey *key = dbkey.data; |
acd1e437 | 738 | |
aba5acdf SH |
739 | if (handle_if(key->iface)) { |
740 | if (!IS_NEG(dbdat.data)) { | |
f332d169 | 741 | char b1[18]; |
acd1e437 | 742 | |
aba5acdf SH |
743 | printf("%-8d %-15s %s\n", |
744 | key->iface, | |
acd1e437 | 745 | inet_ntoa(*(struct in_addr *)&key->addr), |
dd50247d | 746 | ll_addr_n2a(dbdat.data, 6, ARPHRD_ETHER, b1, 18)); |
aba5acdf SH |
747 | } else { |
748 | printf("%-8d %-15s FAILED: %dsec ago\n", | |
749 | key->iface, | |
acd1e437 | 750 | inet_ntoa(*(struct in_addr *)&key->addr), |
aba5acdf SH |
751 | NEG_AGE(dbdat.data)); |
752 | } | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
757 | if (do_load || do_list) | |
758 | goto out; | |
759 | ||
760 | pset[0].fd = socket(PF_PACKET, SOCK_DGRAM, 0); | |
761 | if (pset[0].fd < 0) { | |
762 | perror("socket"); | |
763 | exit(-1); | |
764 | } | |
765 | ||
766 | if (1) { | |
d17b136f PS |
767 | struct sockaddr_ll sll = { |
768 | .sll_family = AF_PACKET, | |
769 | .sll_protocol = htons(ETH_P_ARP), | |
770 | .sll_ifindex = (ifnum == 1 ? ifvec[0] : 0), | |
771 | }; | |
acd1e437 | 772 | |
acd1e437 | 773 | if (bind(pset[0].fd, (struct sockaddr *)&sll, sizeof(sll)) < 0) { |
aba5acdf SH |
774 | perror("bind"); |
775 | goto do_abort; | |
776 | } | |
777 | } | |
778 | ||
779 | if (rtnl_open(&rth, RTMGRP_NEIGH) < 0) { | |
780 | perror("rtnl_open"); | |
781 | goto do_abort; | |
782 | } | |
783 | pset[1].fd = rth.fd; | |
784 | ||
785 | load_initial_table(); | |
786 | ||
a7a9ddbb MF |
787 | if (daemon(0, 0)) { |
788 | perror("arpd: daemon"); | |
789 | goto do_abort; | |
aba5acdf SH |
790 | } |
791 | ||
792 | openlog("arpd", LOG_PID | LOG_CONS, LOG_DAEMON); | |
793 | catch_signal(SIGINT, sig_exit); | |
794 | catch_signal(SIGTERM, sig_exit); | |
795 | catch_signal(SIGHUP, sig_sync); | |
796 | catch_signal(SIGUSR1, sig_stats); | |
797 | ||
798 | #define EVENTS (POLLIN|POLLPRI|POLLERR|POLLHUP) | |
799 | pset[0].events = EVENTS; | |
800 | pset[0].revents = 0; | |
801 | pset[1].events = EVENTS; | |
802 | pset[1].revents = 0; | |
803 | ||
804 | sigsetjmp(env, 1); | |
805 | ||
806 | for (;;) { | |
807 | in_poll = 1; | |
808 | ||
809 | if (do_exit) | |
810 | break; | |
811 | if (do_sync) { | |
812 | in_poll = 0; | |
813 | dbase->sync(dbase, 0); | |
814 | do_sync = 0; | |
815 | in_poll = 1; | |
816 | } | |
817 | if (do_stats) | |
818 | send_stats(); | |
0df7db3c | 819 | if (poll(pset, 2, poll_timeout) > 0) { |
aba5acdf SH |
820 | in_poll = 0; |
821 | if (pset[0].revents&EVENTS) | |
822 | get_arp_pkt(); | |
823 | if (pset[1].revents&EVENTS) | |
824 | get_kern_msg(); | |
825 | } else { | |
826 | do_sync = 1; | |
827 | } | |
828 | } | |
829 | ||
830 | undo_sysctl_adjustments(); | |
831 | out: | |
832 | dbase->close(dbase); | |
833 | exit(0); | |
834 | ||
835 | do_abort: | |
836 | dbase->close(dbase); | |
837 | exit(-1); | |
838 | } |