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Commit | Line | Data |
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59546085 | 1 | /* dnsmasq is Copyright (c) 2000-2012 Simon Kelley |
9e4abcb5 SK |
2 | |
3 | This program is free software; you can redistribute it and/or modify | |
4 | it under the terms of the GNU General Public License as published by | |
824af85b SK |
5 | the Free Software Foundation; version 2 dated June, 1991, or |
6 | (at your option) version 3 dated 29 June, 2007. | |
7 | ||
9e4abcb5 SK |
8 | This program is distributed in the hope that it will be useful, |
9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | GNU General Public License for more details. | |
824af85b | 12 | |
73a08a24 SK |
13 | You should have received a copy of the GNU General Public License |
14 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
9e4abcb5 SK |
15 | */ |
16 | ||
c72daea8 SK |
17 | /* Declare static char *compiler_opts in config.h */ |
18 | #define DNSMASQ_COMPILE_OPTS | |
19 | ||
9e4abcb5 SK |
20 | #include "dnsmasq.h" |
21 | ||
5aabfc78 SK |
22 | struct daemon *daemon; |
23 | ||
5aabfc78 SK |
24 | static volatile pid_t pid = 0; |
25 | static volatile int pipewrite; | |
9e4abcb5 | 26 | |
5aabfc78 SK |
27 | static int set_dns_listeners(time_t now, fd_set *set, int *maxfdp); |
28 | static void check_dns_listeners(fd_set *set, time_t now); | |
3be34541 | 29 | static void sig_handler(int sig); |
5aabfc78 | 30 | static void async_event(int pipe, time_t now); |
c72daea8 SK |
31 | static void fatal_event(struct event_desc *ev, char *msg); |
32 | static int read_event(int fd, struct event_desc *evp, char **msg); | |
9e4abcb5 SK |
33 | |
34 | int main (int argc, char **argv) | |
35 | { | |
de37951c | 36 | int bind_fallback = 0; |
9009d746 | 37 | time_t now; |
9e4abcb5 | 38 | struct sigaction sigact; |
26128d27 | 39 | struct iname *if_tmp; |
1a6bca81 SK |
40 | int piperead, pipefd[2], err_pipe[2]; |
41 | struct passwd *ent_pw = NULL; | |
c72daea8 | 42 | #if defined(HAVE_SCRIPT) |
1a6bca81 SK |
43 | uid_t script_uid = 0; |
44 | gid_t script_gid = 0; | |
7622fc06 SK |
45 | #endif |
46 | struct group *gp = NULL; | |
5aabfc78 | 47 | long i, max_fd = sysconf(_SC_OPEN_MAX); |
1a6bca81 SK |
48 | char *baduser = NULL; |
49 | int log_err; | |
50 | #if defined(HAVE_LINUX_NETWORK) | |
51 | cap_user_header_t hdr = NULL; | |
52 | cap_user_data_t data = NULL; | |
53 | #endif | |
5aabfc78 | 54 | |
824af85b | 55 | #ifdef LOCALEDIR |
b8187c80 SK |
56 | setlocale(LC_ALL, ""); |
57 | bindtextdomain("dnsmasq", LOCALEDIR); | |
58 | textdomain("dnsmasq"); | |
59 | #endif | |
60 | ||
9e4abcb5 SK |
61 | sigact.sa_handler = sig_handler; |
62 | sigact.sa_flags = 0; | |
63 | sigemptyset(&sigact.sa_mask); | |
64 | sigaction(SIGUSR1, &sigact, NULL); | |
5aabfc78 | 65 | sigaction(SIGUSR2, &sigact, NULL); |
9e4abcb5 SK |
66 | sigaction(SIGHUP, &sigact, NULL); |
67 | sigaction(SIGTERM, &sigact, NULL); | |
44a2a316 | 68 | sigaction(SIGALRM, &sigact, NULL); |
feba5c1d SK |
69 | sigaction(SIGCHLD, &sigact, NULL); |
70 | ||
71 | /* ignore SIGPIPE */ | |
72 | sigact.sa_handler = SIG_IGN; | |
73 | sigaction(SIGPIPE, &sigact, NULL); | |
9e4abcb5 | 74 | |
5aabfc78 SK |
75 | umask(022); /* known umask, create leases and pid files as 0644 */ |
76 | ||
77 | read_opts(argc, argv, compile_opts); | |
78 | ||
3be34541 SK |
79 | if (daemon->edns_pktsz < PACKETSZ) |
80 | daemon->edns_pktsz = PACKETSZ; | |
0a852541 SK |
81 | daemon->packet_buff_sz = daemon->edns_pktsz > DNSMASQ_PACKETSZ ? |
82 | daemon->edns_pktsz : DNSMASQ_PACKETSZ; | |
83 | daemon->packet = safe_malloc(daemon->packet_buff_sz); | |
1a6bca81 | 84 | |
c72daea8 SK |
85 | daemon->addrbuff = safe_malloc(ADDRSTRLEN); |
86 | ||
7622fc06 | 87 | #ifdef HAVE_DHCP |
3be34541 | 88 | if (!daemon->lease_file) |
9e4abcb5 | 89 | { |
52b92f4d | 90 | if (daemon->dhcp || daemon->dhcp6) |
3be34541 | 91 | daemon->lease_file = LEASEFILE; |
9e4abcb5 | 92 | } |
7622fc06 | 93 | #endif |
9e4abcb5 | 94 | |
a2761754 SK |
95 | /* Close any file descriptors we inherited apart from std{in|out|err} |
96 | ||
97 | Ensure that at least stdin, stdout and stderr (fd 0, 1, 2) exist, | |
98 | otherwise file descriptors we create can end up being 0, 1, or 2 | |
99 | and then get accidentally closed later when we make 0, 1, and 2 | |
100 | open to /dev/null. Normally we'll be started with 0, 1 and 2 open, | |
101 | but it's not guaranteed. By opening /dev/null three times, we | |
102 | ensure that we're not using those fds for real stuff. */ | |
5aabfc78 SK |
103 | for (i = 0; i < max_fd; i++) |
104 | if (i != STDOUT_FILENO && i != STDERR_FILENO && i != STDIN_FILENO) | |
105 | close(i); | |
a2761754 SK |
106 | else |
107 | open("/dev/null", O_RDWR); | |
5aabfc78 | 108 | |
801ca9a7 SK |
109 | #ifndef HAVE_LINUX_NETWORK |
110 | # if !(defined(IP_RECVDSTADDR) && defined(IP_RECVIF) && defined(IP_SENDSRCADDR)) | |
28866e95 | 111 | if (!option_bool(OPT_NOWILD)) |
de37951c SK |
112 | { |
113 | bind_fallback = 1; | |
28866e95 | 114 | set_option_bool(OPT_NOWILD); |
de37951c | 115 | } |
801ca9a7 | 116 | # endif |
309331f5 SK |
117 | #endif |
118 | ||
832af0ba | 119 | #ifndef HAVE_TFTP |
8ef5ada2 | 120 | if (daemon->tftp_unlimited || daemon->tftp_interfaces) |
5aabfc78 | 121 | die(_("TFTP server not available: set HAVE_TFTP in src/config.h"), NULL, EC_BADCONF); |
832af0ba SK |
122 | #endif |
123 | ||
7de060b0 SK |
124 | #ifdef HAVE_CONNTRACK |
125 | if (option_bool(OPT_CONNTRACK) && (daemon->query_port != 0 || daemon->osport)) | |
126 | die (_("Cannot use --conntrack AND --query-port"), NULL, EC_BADCONF); | |
127 | #else | |
128 | if (option_bool(OPT_CONNTRACK)) | |
129 | die(_("Conntrack support not available: set HAVE_CONNTRACK in src/config.h"), NULL, EC_BADCONF); | |
130 | #endif | |
131 | ||
824af85b SK |
132 | #ifdef HAVE_SOLARIS_NETWORK |
133 | if (daemon->max_logs != 0) | |
134 | die(_("asychronous logging is not available under Solaris"), NULL, EC_BADCONF); | |
135 | #endif | |
136 | ||
572b41eb SK |
137 | #ifdef __ANDROID__ |
138 | if (daemon->max_logs != 0) | |
139 | die(_("asychronous logging is not available under Android"), NULL, EC_BADCONF); | |
140 | #endif | |
141 | ||
1a6bca81 SK |
142 | rand_init(); |
143 | ||
5aabfc78 SK |
144 | now = dnsmasq_time(); |
145 | ||
7622fc06 | 146 | #ifdef HAVE_DHCP |
52b92f4d | 147 | if (daemon->dhcp || daemon->dhcp6) |
5aabfc78 | 148 | { |
5aabfc78 SK |
149 | /* Note that order matters here, we must call lease_init before |
150 | creating any file descriptors which shouldn't be leaked | |
4cb1b320 SK |
151 | to the lease-script init process. We need to call common_init |
152 | before lease_init to allocate buffers it uses.*/ | |
153 | dhcp_common_init(); | |
5aabfc78 | 154 | lease_init(now); |
843c96b4 | 155 | |
52b92f4d SK |
156 | if (daemon->dhcp) |
157 | dhcp_init(); | |
843c96b4 SK |
158 | } |
159 | ||
160 | # ifdef HAVE_DHCP6 | |
161 | /* Start RA subsystem if --enable-ra OR dhcp-range=<subnet>, ra-only */ | |
162 | if (daemon->ra_contexts || option_bool(OPT_RA)) | |
163 | { | |
164 | /* link the DHCP6 contexts to the ra-only ones so we can traverse them all | |
165 | from ->ra_contexts, but only the non-ra-onlies from ->dhcp6 */ | |
166 | struct dhcp_context *context; | |
167 | ||
168 | if (!daemon->ra_contexts) | |
169 | daemon->ra_contexts = daemon->dhcp6; | |
170 | else | |
c5ad4e79 | 171 | { |
843c96b4 SK |
172 | for (context = daemon->ra_contexts; context->next; context = context->next); |
173 | context->next = daemon->dhcp6; | |
c5ad4e79 | 174 | } |
843c96b4 | 175 | ra_init(now); |
5aabfc78 | 176 | } |
843c96b4 SK |
177 | |
178 | if (daemon->dhcp6) | |
179 | dhcp6_init(); | |
180 | ||
801ca9a7 SK |
181 | # endif |
182 | ||
183 | #endif | |
184 | ||
185 | #ifdef HAVE_LINUX_NETWORK | |
186 | /* After lease_init */ | |
187 | netlink_init(); | |
188 | #endif | |
189 | ||
190 | #ifdef HAVE_DHCP6 | |
191 | /* after netlink_init */ | |
843c96b4 SK |
192 | if (daemon->ra_contexts || daemon->dhcp6) |
193 | join_multicast(); | |
801ca9a7 | 194 | #endif |
843c96b4 | 195 | |
801ca9a7 SK |
196 | #ifdef HAVE_DHCP |
197 | /* after netlink_init */ | |
198 | if (daemon->dhcp || daemon->dhcp6) | |
8b372704 | 199 | lease_find_interfaces(now); |
7622fc06 | 200 | #endif |
5aabfc78 SK |
201 | |
202 | if (!enumerate_interfaces()) | |
203 | die(_("failed to find list of interfaces: %s"), NULL, EC_MISC); | |
843c96b4 | 204 | |
28866e95 | 205 | if (option_bool(OPT_NOWILD)) |
de37951c | 206 | { |
74c95c25 | 207 | create_bound_listeners(1); |
de37951c | 208 | |
3be34541 | 209 | for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next) |
de37951c | 210 | if (if_tmp->name && !if_tmp->used) |
5aabfc78 | 211 | die(_("unknown interface %s"), if_tmp->name, EC_BADNET); |
9380ba70 SK |
212 | |
213 | #if defined(HAVE_LINUX_NETWORK) && defined(HAVE_DHCP) | |
214 | /* after enumerate_interfaces() */ | |
215 | if (daemon->dhcp) | |
216 | { | |
217 | bindtodevice(daemon->dhcpfd); | |
218 | if (daemon->enable_pxe) | |
219 | bindtodevice(daemon->pxefd); | |
220 | } | |
221 | #endif | |
222 | ||
223 | #if defined(HAVE_LINUX_NETWORK) && defined(HAVE_DHCP6) | |
224 | if (daemon->dhcp6) | |
225 | bindtodevice(daemon->dhcp6fd); | |
226 | #endif | |
de37951c | 227 | } |
28866e95 | 228 | else |
74c95c25 | 229 | create_wildcard_listeners(); |
de37951c | 230 | |
824af85b SK |
231 | if (daemon->port != 0) |
232 | cache_init(); | |
1a6bca81 | 233 | |
28866e95 | 234 | if (option_bool(OPT_DBUS)) |
3d8df260 SK |
235 | #ifdef HAVE_DBUS |
236 | { | |
237 | char *err; | |
238 | daemon->dbus = NULL; | |
239 | daemon->watches = NULL; | |
5aabfc78 SK |
240 | if ((err = dbus_init())) |
241 | die(_("DBus error: %s"), err, EC_MISC); | |
3d8df260 SK |
242 | } |
243 | #else | |
5aabfc78 | 244 | die(_("DBus not available: set HAVE_DBUS in src/config.h"), NULL, EC_BADCONF); |
3d8df260 SK |
245 | #endif |
246 | ||
824af85b SK |
247 | if (daemon->port != 0) |
248 | pre_allocate_sfds(); | |
1a6bca81 | 249 | |
c72daea8 | 250 | #if defined(HAVE_SCRIPT) |
1a6bca81 | 251 | /* Note getpwnam returns static storage */ |
843c96b4 SK |
252 | if ((daemon->dhcp || daemon->dhcp6) && |
253 | daemon->scriptuser && | |
c72daea8 | 254 | (daemon->lease_change_command || daemon->luascript)) |
1a6bca81 SK |
255 | { |
256 | if ((ent_pw = getpwnam(daemon->scriptuser))) | |
257 | { | |
258 | script_uid = ent_pw->pw_uid; | |
259 | script_gid = ent_pw->pw_gid; | |
260 | } | |
261 | else | |
262 | baduser = daemon->scriptuser; | |
263 | } | |
7622fc06 | 264 | #endif |
9e4abcb5 | 265 | |
1a6bca81 SK |
266 | if (daemon->username && !(ent_pw = getpwnam(daemon->username))) |
267 | baduser = daemon->username; | |
268 | else if (daemon->groupname && !(gp = getgrnam(daemon->groupname))) | |
269 | baduser = daemon->groupname; | |
270 | ||
271 | if (baduser) | |
272 | die(_("unknown user or group: %s"), baduser, EC_BADCONF); | |
273 | ||
274 | /* implement group defaults, "dip" if available, or group associated with uid */ | |
275 | if (!daemon->group_set && !gp) | |
276 | { | |
277 | if (!(gp = getgrnam(CHGRP)) && ent_pw) | |
278 | gp = getgrgid(ent_pw->pw_gid); | |
279 | ||
280 | /* for error message */ | |
281 | if (gp) | |
282 | daemon->groupname = gp->gr_name; | |
283 | } | |
284 | ||
285 | #if defined(HAVE_LINUX_NETWORK) | |
286 | /* determine capability API version here, while we can still | |
287 | call safe_malloc */ | |
288 | if (ent_pw && ent_pw->pw_uid != 0) | |
289 | { | |
1a6bca81 | 290 | int capsize = 1; /* for header version 1 */ |
3927da46 SK |
291 | hdr = safe_malloc(sizeof(*hdr)); |
292 | ||
1a6bca81 SK |
293 | /* find version supported by kernel */ |
294 | memset(hdr, 0, sizeof(*hdr)); | |
295 | capget(hdr, NULL); | |
296 | ||
297 | if (hdr->version != LINUX_CAPABILITY_VERSION_1) | |
298 | { | |
299 | /* if unknown version, use largest supported version (3) */ | |
300 | if (hdr->version != LINUX_CAPABILITY_VERSION_2) | |
301 | hdr->version = LINUX_CAPABILITY_VERSION_3; | |
302 | capsize = 2; | |
303 | } | |
304 | ||
305 | data = safe_malloc(sizeof(*data) * capsize); | |
306 | memset(data, 0, sizeof(*data) * capsize); | |
307 | } | |
308 | #endif | |
309 | ||
5aabfc78 | 310 | /* Use a pipe to carry signals and other events back to the event loop |
1a6bca81 SK |
311 | in a race-free manner and another to carry errors to daemon-invoking process */ |
312 | safe_pipe(pipefd, 1); | |
5e9e0efb SK |
313 | |
314 | piperead = pipefd[0]; | |
315 | pipewrite = pipefd[1]; | |
316 | /* prime the pipe to load stuff first time. */ | |
c72daea8 | 317 | send_event(pipewrite, EVENT_RELOAD, 0, NULL); |
1a6bca81 SK |
318 | |
319 | err_pipe[1] = -1; | |
1697269c | 320 | |
28866e95 | 321 | if (!option_bool(OPT_DEBUG)) |
9e4abcb5 | 322 | { |
9e4abcb5 SK |
323 | /* The following code "daemonizes" the process. |
324 | See Stevens section 12.4 */ | |
1a6bca81 | 325 | |
9e038946 SK |
326 | if (chdir("/") != 0) |
327 | die(_("cannot chdir to filesystem root: %s"), NULL, EC_MISC); | |
328 | ||
1697269c | 329 | #ifndef NO_FORK |
28866e95 | 330 | if (!option_bool(OPT_NO_FORK)) |
3be34541 | 331 | { |
5aabfc78 | 332 | pid_t pid; |
3be34541 | 333 | |
1a6bca81 SK |
334 | /* pipe to carry errors back to original process. |
335 | When startup is complete we close this and the process terminates. */ | |
336 | safe_pipe(err_pipe, 0); | |
337 | ||
7622fc06 SK |
338 | if ((pid = fork()) == -1) |
339 | /* fd == -1 since we've not forked, never returns. */ | |
c72daea8 | 340 | send_event(-1, EVENT_FORK_ERR, errno, NULL); |
9e038946 | 341 | |
5aabfc78 | 342 | if (pid != 0) |
1a6bca81 SK |
343 | { |
344 | struct event_desc ev; | |
c72daea8 SK |
345 | char *msg; |
346 | ||
1a6bca81 SK |
347 | /* close our copy of write-end */ |
348 | close(err_pipe[1]); | |
349 | ||
350 | /* check for errors after the fork */ | |
c72daea8 SK |
351 | if (read_event(err_pipe[0], &ev, &msg)) |
352 | fatal_event(&ev, msg); | |
1a6bca81 SK |
353 | |
354 | _exit(EC_GOOD); | |
355 | } | |
356 | ||
357 | close(err_pipe[0]); | |
358 | ||
359 | /* NO calls to die() from here on. */ | |
3be34541 | 360 | |
5aabfc78 | 361 | setsid(); |
7622fc06 SK |
362 | |
363 | if ((pid = fork()) == -1) | |
c72daea8 | 364 | send_event(err_pipe[1], EVENT_FORK_ERR, errno, NULL); |
7622fc06 SK |
365 | |
366 | if (pid != 0) | |
7cebd20f | 367 | _exit(0); |
3be34541 | 368 | } |
9e4abcb5 | 369 | #endif |
9e038946 | 370 | |
9e4abcb5 | 371 | /* write pidfile _after_ forking ! */ |
1a6bca81 SK |
372 | if (daemon->runfile) |
373 | { | |
374 | FILE *pidfile; | |
375 | ||
376 | /* only complain if started as root */ | |
377 | if ((pidfile = fopen(daemon->runfile, "w"))) | |
378 | { | |
379 | fprintf(pidfile, "%d\n", (int) getpid()); | |
380 | fclose(pidfile); | |
381 | } | |
382 | else if (getuid() == 0) | |
383 | { | |
c72daea8 | 384 | send_event(err_pipe[1], EVENT_PIDFILE, errno, daemon->runfile); |
1a6bca81 SK |
385 | _exit(0); |
386 | } | |
9e4abcb5 | 387 | } |
1697269c SK |
388 | } |
389 | ||
8ef5ada2 SK |
390 | log_err = log_start(ent_pw, err_pipe[1]); |
391 | ||
28866e95 | 392 | if (!option_bool(OPT_DEBUG)) |
8ef5ada2 SK |
393 | { |
394 | /* open stdout etc to /dev/null */ | |
395 | int nullfd = open("/dev/null", O_RDWR); | |
396 | dup2(nullfd, STDOUT_FILENO); | |
397 | dup2(nullfd, STDERR_FILENO); | |
398 | dup2(nullfd, STDIN_FILENO); | |
399 | close(nullfd); | |
400 | } | |
1a6bca81 SK |
401 | |
402 | /* if we are to run scripts, we need to fork a helper before dropping root. */ | |
403 | daemon->helperfd = -1; | |
c72daea8 | 404 | #ifdef HAVE_SCRIPT |
52b92f4d | 405 | if ((daemon->dhcp || daemon->dhcp6) && (daemon->lease_change_command || daemon->luascript)) |
1a6bca81 | 406 | daemon->helperfd = create_helper(pipewrite, err_pipe[1], script_uid, script_gid, max_fd); |
5aabfc78 | 407 | #endif |
5aabfc78 | 408 | |
28866e95 | 409 | if (!option_bool(OPT_DEBUG) && getuid() == 0) |
1697269c | 410 | { |
1a6bca81 SK |
411 | int bad_capabilities = 0; |
412 | gid_t dummy; | |
413 | ||
414 | /* remove all supplimentary groups */ | |
415 | if (gp && | |
416 | (setgroups(0, &dummy) == -1 || | |
417 | setgid(gp->gr_gid) == -1)) | |
9e4abcb5 | 418 | { |
c72daea8 | 419 | send_event(err_pipe[1], EVENT_GROUP_ERR, errno, daemon->groupname); |
1a6bca81 | 420 | _exit(0); |
7cebd20f | 421 | } |
1a6bca81 | 422 | |
7cebd20f | 423 | if (ent_pw && ent_pw->pw_uid != 0) |
1697269c | 424 | { |
74c95c25 | 425 | #if defined(HAVE_LINUX_NETWORK) |
1697269c | 426 | /* On linux, we keep CAP_NETADMIN (for ARP-injection) and |
74c95c25 SK |
427 | CAP_NET_RAW (for icmp) if we're doing dhcp. If we have yet to bind |
428 | ports because of DAD, we need CAP_NET_BIND_SERVICE too. */ | |
429 | if (is_dad_listeners()) | |
430 | data->effective = data->permitted = data->inheritable = | |
431 | (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | | |
432 | (1 << CAP_SETUID) | (1 << CAP_NET_BIND_SERVICE); | |
433 | else | |
434 | data->effective = data->permitted = data->inheritable = | |
435 | (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | (1 << CAP_SETUID); | |
5e9e0efb | 436 | |
1697269c | 437 | /* Tell kernel to not clear capabilities when dropping root */ |
572b41eb | 438 | if (capset(hdr, data) == -1 || prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == -1) |
1697269c | 439 | bad_capabilities = errno; |
1a6bca81 | 440 | |
7622fc06 | 441 | #elif defined(HAVE_SOLARIS_NETWORK) |
824af85b SK |
442 | /* http://developers.sun.com/solaris/articles/program_privileges.html */ |
443 | priv_set_t *priv_set; | |
444 | ||
445 | if (!(priv_set = priv_str_to_set("basic", ",", NULL)) || | |
446 | priv_addset(priv_set, PRIV_NET_ICMPACCESS) == -1 || | |
447 | priv_addset(priv_set, PRIV_SYS_NET_CONFIG) == -1) | |
448 | bad_capabilities = errno; | |
449 | ||
450 | if (priv_set && bad_capabilities == 0) | |
451 | { | |
452 | priv_inverse(priv_set); | |
453 | ||
454 | if (setppriv(PRIV_OFF, PRIV_LIMIT, priv_set) == -1) | |
455 | bad_capabilities = errno; | |
456 | } | |
457 | ||
458 | if (priv_set) | |
459 | priv_freeset(priv_set); | |
460 | ||
824af85b SK |
461 | #endif |
462 | ||
1a6bca81 | 463 | if (bad_capabilities != 0) |
1697269c | 464 | { |
c72daea8 | 465 | send_event(err_pipe[1], EVENT_CAP_ERR, bad_capabilities, NULL); |
1a6bca81 SK |
466 | _exit(0); |
467 | } | |
468 | ||
469 | /* finally drop root */ | |
470 | if (setuid(ent_pw->pw_uid) == -1) | |
471 | { | |
c72daea8 | 472 | send_event(err_pipe[1], EVENT_USER_ERR, errno, daemon->username); |
1a6bca81 SK |
473 | _exit(0); |
474 | } | |
475 | ||
1697269c | 476 | #ifdef HAVE_LINUX_NETWORK |
74c95c25 SK |
477 | if (is_dad_listeners()) |
478 | data->effective = data->permitted = | |
479 | (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW) | (1 << CAP_NET_BIND_SERVICE); | |
480 | else | |
481 | data->effective = data->permitted = | |
482 | (1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW); | |
1a6bca81 SK |
483 | data->inheritable = 0; |
484 | ||
485 | /* lose the setuid and setgid capbilities */ | |
486 | if (capset(hdr, data) == -1) | |
487 | { | |
c72daea8 | 488 | send_event(err_pipe[1], EVENT_CAP_ERR, errno, NULL); |
1a6bca81 | 489 | _exit(0); |
1697269c | 490 | } |
1a6bca81 SK |
491 | #endif |
492 | ||
9e4abcb5 SK |
493 | } |
494 | } | |
1697269c | 495 | |
1697269c | 496 | #ifdef HAVE_LINUX_NETWORK |
28866e95 | 497 | if (option_bool(OPT_DEBUG)) |
572b41eb | 498 | prctl(PR_SET_DUMPABLE, 1, 0, 0, 0); |
1697269c | 499 | #endif |
9e4abcb5 | 500 | |
824af85b SK |
501 | if (daemon->port == 0) |
502 | my_syslog(LOG_INFO, _("started, version %s DNS disabled"), VERSION); | |
503 | else if (daemon->cachesize != 0) | |
f2621c7f | 504 | my_syslog(LOG_INFO, _("started, version %s cachesize %d"), VERSION, daemon->cachesize); |
9e4abcb5 | 505 | else |
f2621c7f | 506 | my_syslog(LOG_INFO, _("started, version %s cache disabled"), VERSION); |
1697269c | 507 | |
f2621c7f | 508 | my_syslog(LOG_INFO, _("compile time options: %s"), compile_opts); |
1697269c | 509 | |
3d8df260 | 510 | #ifdef HAVE_DBUS |
28866e95 | 511 | if (option_bool(OPT_DBUS)) |
3d8df260 SK |
512 | { |
513 | if (daemon->dbus) | |
f2621c7f | 514 | my_syslog(LOG_INFO, _("DBus support enabled: connected to system bus")); |
3d8df260 | 515 | else |
f2621c7f | 516 | my_syslog(LOG_INFO, _("DBus support enabled: bus connection pending")); |
3d8df260 SK |
517 | } |
518 | #endif | |
519 | ||
1a6bca81 SK |
520 | if (log_err != 0) |
521 | my_syslog(LOG_WARNING, _("warning: failed to change owner of %s: %s"), | |
522 | daemon->log_file, strerror(log_err)); | |
523 | ||
de37951c | 524 | if (bind_fallback) |
f2621c7f | 525 | my_syslog(LOG_WARNING, _("setting --bind-interfaces option because of OS limitations")); |
de37951c | 526 | |
28866e95 | 527 | if (!option_bool(OPT_NOWILD)) |
26128d27 SK |
528 | for (if_tmp = daemon->if_names; if_tmp; if_tmp = if_tmp->next) |
529 | if (if_tmp->name && !if_tmp->used) | |
f2621c7f | 530 | my_syslog(LOG_WARNING, _("warning: interface %s does not currently exist"), if_tmp->name); |
5e9e0efb | 531 | |
28866e95 | 532 | if (daemon->port != 0 && option_bool(OPT_NO_RESOLV)) |
208b65c5 SK |
533 | { |
534 | if (daemon->resolv_files && !daemon->resolv_files->is_default) | |
f2621c7f | 535 | my_syslog(LOG_WARNING, _("warning: ignoring resolv-file flag because no-resolv is set")); |
208b65c5 | 536 | daemon->resolv_files = NULL; |
1b7ecd11 | 537 | if (!daemon->servers) |
f2621c7f | 538 | my_syslog(LOG_WARNING, _("warning: no upstream servers configured")); |
208b65c5 SK |
539 | } |
540 | ||
f2621c7f SK |
541 | if (daemon->max_logs != 0) |
542 | my_syslog(LOG_INFO, _("asynchronous logging enabled, queue limit is %d messages"), daemon->max_logs); | |
c5ad4e79 | 543 | |
843c96b4 | 544 | if (daemon->ra_contexts) |
c5ad4e79 | 545 | my_syslog(MS_DHCP | LOG_INFO, _("IPv6 router advertisement enabled")); |
f2621c7f | 546 | |
7622fc06 | 547 | #ifdef HAVE_DHCP |
c8257540 | 548 | if (daemon->dhcp || daemon->dhcp6 || daemon->ra_contexts) |
9e4abcb5 | 549 | { |
3be34541 | 550 | struct dhcp_context *dhcp_tmp; |
52b92f4d SK |
551 | int family = AF_INET; |
552 | dhcp_tmp = daemon->dhcp; | |
553 | ||
3268e90f | 554 | #ifdef HAVE_DHCP6 |
52b92f4d | 555 | again: |
3268e90f | 556 | #endif |
52b92f4d | 557 | for (; dhcp_tmp; dhcp_tmp = dhcp_tmp->next) |
feba5c1d | 558 | { |
52b92f4d SK |
559 | void *start = &dhcp_tmp->start; |
560 | void *end = &dhcp_tmp->end; | |
c8257540 | 561 | |
52b92f4d SK |
562 | #ifdef HAVE_DHCP6 |
563 | if (family == AF_INET6) | |
564 | { | |
565 | start = &dhcp_tmp->start6; | |
566 | end = &dhcp_tmp->end6; | |
30cd9666 SK |
567 | struct in6_addr subnet = dhcp_tmp->start6; |
568 | setaddr6part(&subnet, 0); | |
c8257540 | 569 | inet_ntop(AF_INET6, &subnet, daemon->addrbuff, 256); |
52b92f4d SK |
570 | } |
571 | #endif | |
572 | ||
c8257540 SK |
573 | if (family != AF_INET && (dhcp_tmp->flags & CONTEXT_DEPRECATE)) |
574 | strcpy(daemon->namebuff, _("prefix deprecated")); | |
575 | else | |
576 | { | |
577 | char *p = daemon->namebuff; | |
578 | p += sprintf(p, _("lease time ")); | |
579 | prettyprint_time(p, dhcp_tmp->lease_time); | |
580 | } | |
581 | ||
582 | if (daemon->dhcp_buff) | |
583 | inet_ntop(family, start, daemon->dhcp_buff, 256); | |
584 | if (daemon->dhcp_buff3) | |
585 | inet_ntop(family, end, daemon->dhcp_buff3, 256); | |
30cd9666 SK |
586 | if ((dhcp_tmp->flags & CONTEXT_DHCP) || family == AF_INET) |
587 | my_syslog(MS_DHCP | LOG_INFO, | |
30cd9666 | 588 | (dhcp_tmp->flags & CONTEXT_RA_STATELESS) ? |
c8257540 | 589 | _("stateless DHCPv6 on %s%.0s%.0s") : |
22407048 | 590 | (dhcp_tmp->flags & CONTEXT_STATIC) ? |
c8257540 | 591 | _("DHCP, static leases only on %.0s%s, %s") : |
30cd9666 SK |
592 | (dhcp_tmp->flags & CONTEXT_PROXY) ? |
593 | _("DHCP, proxy on subnet %.0s%s%.0s") : | |
c8257540 | 594 | _("DHCP, IP range %s -- %s, %s"), |
30cd9666 | 595 | daemon->dhcp_buff, daemon->dhcp_buff3, daemon->namebuff); |
c8257540 | 596 | |
30cd9666 | 597 | if (dhcp_tmp->flags & CONTEXT_RA_NAME) |
c8257540 SK |
598 | my_syslog(MS_DHCP | LOG_INFO, _("DHCPv4-derived IPv6 names on %s"), |
599 | daemon->addrbuff); | |
600 | if (dhcp_tmp->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS)) | |
601 | { | |
602 | if (!(dhcp_tmp->flags & CONTEXT_DEPRECATE)) | |
603 | { | |
604 | char *p = daemon->namebuff; | |
605 | p += sprintf(p, _("prefix valid ")); | |
606 | prettyprint_time(p, dhcp_tmp->lease_time > 7200 ? dhcp_tmp->lease_time : 7200); | |
607 | } | |
608 | my_syslog(MS_DHCP | LOG_INFO, _("SLAAC on %s %s"), | |
609 | daemon->addrbuff, daemon->namebuff); | |
610 | } | |
52b92f4d SK |
611 | } |
612 | ||
613 | #ifdef HAVE_DHCP6 | |
614 | if (family == AF_INET) | |
615 | { | |
616 | family = AF_INET6; | |
c5ad4e79 SK |
617 | if (daemon->ra_contexts) |
618 | dhcp_tmp = daemon->ra_contexts; | |
619 | else | |
620 | dhcp_tmp = daemon->dhcp6; | |
52b92f4d | 621 | goto again; |
feba5c1d | 622 | } |
52b92f4d SK |
623 | #endif |
624 | ||
26128d27 | 625 | } |
7622fc06 | 626 | #endif |
26128d27 | 627 | |
52b92f4d | 628 | |
832af0ba | 629 | #ifdef HAVE_TFTP |
8ef5ada2 | 630 | if (daemon->tftp_unlimited || daemon->tftp_interfaces) |
832af0ba | 631 | { |
832af0ba | 632 | #ifdef FD_SETSIZE |
5aabfc78 | 633 | if (FD_SETSIZE < (unsigned)max_fd) |
832af0ba SK |
634 | max_fd = FD_SETSIZE; |
635 | #endif | |
636 | ||
7622fc06 | 637 | my_syslog(MS_TFTP | LOG_INFO, "TFTP %s%s %s", |
f2621c7f SK |
638 | daemon->tftp_prefix ? _("root is ") : _("enabled"), |
639 | daemon->tftp_prefix ? daemon->tftp_prefix: "", | |
28866e95 | 640 | option_bool(OPT_TFTP_SECURE) ? _("secure mode") : ""); |
f2621c7f | 641 | |
832af0ba | 642 | /* This is a guess, it assumes that for small limits, |
f2621c7f | 643 | disjoint files might be served, but for large limits, |
832af0ba SK |
644 | a single file will be sent to may clients (the file only needs |
645 | one fd). */ | |
646 | ||
647 | max_fd -= 30; /* use other than TFTP */ | |
648 | ||
649 | if (max_fd < 0) | |
650 | max_fd = 5; | |
651 | else if (max_fd < 100) | |
652 | max_fd = max_fd/2; | |
653 | else | |
654 | max_fd = max_fd - 20; | |
824af85b SK |
655 | |
656 | /* if we have to use a limited range of ports, | |
657 | that will limit the number of transfers */ | |
658 | if (daemon->start_tftp_port != 0 && | |
659 | daemon->end_tftp_port - daemon->start_tftp_port + 1 < max_fd) | |
660 | max_fd = daemon->end_tftp_port - daemon->start_tftp_port + 1; | |
832af0ba SK |
661 | |
662 | if (daemon->tftp_max > max_fd) | |
663 | { | |
664 | daemon->tftp_max = max_fd; | |
7622fc06 | 665 | my_syslog(MS_TFTP | LOG_WARNING, |
f2621c7f SK |
666 | _("restricting maximum simultaneous TFTP transfers to %d"), |
667 | daemon->tftp_max); | |
832af0ba SK |
668 | } |
669 | } | |
670 | #endif | |
671 | ||
1a6bca81 SK |
672 | /* finished start-up - release original process */ |
673 | if (err_pipe[1] != -1) | |
674 | close(err_pipe[1]); | |
9e4abcb5 | 675 | |
824af85b SK |
676 | if (daemon->port != 0) |
677 | check_servers(); | |
678 | ||
7cebd20f SK |
679 | pid = getpid(); |
680 | ||
5e9e0efb | 681 | while (1) |
9e4abcb5 | 682 | { |
1697269c | 683 | int maxfd = -1; |
5e9e0efb | 684 | struct timeval t, *tp = NULL; |
3d8df260 | 685 | fd_set rset, wset, eset; |
9e4abcb5 SK |
686 | |
687 | FD_ZERO(&rset); | |
3d8df260 SK |
688 | FD_ZERO(&wset); |
689 | FD_ZERO(&eset); | |
9e4abcb5 | 690 | |
1697269c SK |
691 | /* if we are out of resources, find how long we have to wait |
692 | for some to come free, we'll loop around then and restart | |
693 | listening for queries */ | |
5aabfc78 | 694 | if ((t.tv_sec = set_dns_listeners(now, &rset, &maxfd)) != 0) |
1697269c SK |
695 | { |
696 | t.tv_usec = 0; | |
697 | tp = &t; | |
698 | } | |
699 | ||
832af0ba SK |
700 | /* Whilst polling for the dbus, or doing a tftp transfer, wake every quarter second */ |
701 | if (daemon->tftp_trans || | |
28866e95 | 702 | (option_bool(OPT_DBUS) && !daemon->dbus)) |
5e9e0efb | 703 | { |
1697269c SK |
704 | t.tv_sec = 0; |
705 | t.tv_usec = 250000; | |
5e9e0efb | 706 | tp = &t; |
5e9e0efb | 707 | } |
74c95c25 SK |
708 | /* Wake every second whilst waiting for DAD to complete */ |
709 | else if (is_dad_listeners()) | |
710 | { | |
711 | t.tv_sec = 1; | |
712 | t.tv_usec = 0; | |
713 | tp = &t; | |
714 | } | |
44a2a316 | 715 | |
832af0ba | 716 | #ifdef HAVE_DBUS |
5aabfc78 | 717 | set_dbus_listeners(&maxfd, &rset, &wset, &eset); |
5e9e0efb SK |
718 | #endif |
719 | ||
7622fc06 | 720 | #ifdef HAVE_DHCP |
5e9e0efb SK |
721 | if (daemon->dhcp) |
722 | { | |
723 | FD_SET(daemon->dhcpfd, &rset); | |
1697269c | 724 | bump_maxfd(daemon->dhcpfd, &maxfd); |
316e2730 SK |
725 | if (daemon->pxefd != -1) |
726 | { | |
727 | FD_SET(daemon->pxefd, &rset); | |
728 | bump_maxfd(daemon->pxefd, &maxfd); | |
729 | } | |
5e9e0efb | 730 | } |
7622fc06 | 731 | #endif |
cdeda28f | 732 | |
52b92f4d SK |
733 | #ifdef HAVE_DHCP6 |
734 | if (daemon->dhcp6) | |
735 | { | |
736 | FD_SET(daemon->dhcp6fd, &rset); | |
c5ad4e79 | 737 | bump_maxfd(daemon->dhcp6fd, &maxfd); |
5d71d834 SK |
738 | } |
739 | ||
740 | if (daemon->ra_contexts) | |
741 | { | |
742 | FD_SET(daemon->icmp6fd, &rset); | |
743 | bump_maxfd(daemon->icmp6fd, &maxfd); | |
52b92f4d SK |
744 | } |
745 | #endif | |
746 | ||
5e9e0efb SK |
747 | #ifdef HAVE_LINUX_NETWORK |
748 | FD_SET(daemon->netlinkfd, &rset); | |
1697269c | 749 | bump_maxfd(daemon->netlinkfd, &maxfd); |
3d8df260 | 750 | #endif |
3d8df260 | 751 | |
5e9e0efb | 752 | FD_SET(piperead, &rset); |
1697269c SK |
753 | bump_maxfd(piperead, &maxfd); |
754 | ||
7622fc06 | 755 | #ifdef HAVE_DHCP |
1f15b81d | 756 | # ifdef HAVE_SCRIPT |
5aabfc78 | 757 | while (helper_buf_empty() && do_script_run(now)); |
1697269c | 758 | |
a9530964 SK |
759 | # ifdef HAVE_TFTP |
760 | while (helper_buf_empty() && do_tftp_script_run()); | |
761 | # endif | |
762 | ||
1697269c SK |
763 | if (!helper_buf_empty()) |
764 | { | |
765 | FD_SET(daemon->helperfd, &wset); | |
766 | bump_maxfd(daemon->helperfd, &maxfd); | |
767 | } | |
7622fc06 | 768 | # else |
5aabfc78 SK |
769 | /* need this for other side-effects */ |
770 | while (do_script_run(now)); | |
a9530964 SK |
771 | |
772 | # ifdef HAVE_TFTP | |
773 | while (do_tftp_script_run()); | |
774 | # endif | |
775 | ||
7622fc06 | 776 | # endif |
5aabfc78 | 777 | #endif |
7622fc06 | 778 | |
f2621c7f SK |
779 | /* must do this just before select(), when we know no |
780 | more calls to my_syslog() can occur */ | |
781 | set_log_writer(&wset, &maxfd); | |
782 | ||
5e9e0efb SK |
783 | if (select(maxfd+1, &rset, &wset, &eset, tp) < 0) |
784 | { | |
785 | /* otherwise undefined after error */ | |
786 | FD_ZERO(&rset); FD_ZERO(&wset); FD_ZERO(&eset); | |
787 | } | |
788 | ||
789 | now = dnsmasq_time(); | |
9e4abcb5 | 790 | |
f2621c7f | 791 | check_log_writer(&wset); |
74c95c25 SK |
792 | |
793 | /* Check the interfaces to see if any have exited DAD state | |
794 | and if so, bind the address. */ | |
795 | if (is_dad_listeners()) | |
796 | { | |
797 | enumerate_interfaces(); | |
798 | /* NB, is_dad_listeners() == 1 --> we're binding interfaces */ | |
799 | create_bound_listeners(0); | |
800 | } | |
f2621c7f | 801 | |
c52e1897 SK |
802 | #ifdef HAVE_LINUX_NETWORK |
803 | if (FD_ISSET(daemon->netlinkfd, &rset)) | |
804 | netlink_multicast(); | |
805 | #endif | |
806 | ||
9e4abcb5 | 807 | /* Check for changes to resolv files once per second max. */ |
3d8df260 | 808 | /* Don't go silent for long periods if the clock goes backwards. */ |
9009d746 SK |
809 | if (daemon->last_resolv == 0 || |
810 | difftime(now, daemon->last_resolv) > 1.0 || | |
811 | difftime(now, daemon->last_resolv) < -1.0) | |
9e4abcb5 | 812 | { |
8ef5ada2 SK |
813 | /* poll_resolv doesn't need to reload first time through, since |
814 | that's queued anyway. */ | |
33820b7e | 815 | |
8ef5ada2 SK |
816 | poll_resolv(0, daemon->last_resolv != 0, now); |
817 | daemon->last_resolv = now; | |
9e4abcb5 | 818 | } |
5aabfc78 | 819 | |
5e9e0efb | 820 | if (FD_ISSET(piperead, &rset)) |
5aabfc78 | 821 | async_event(piperead, now); |
7cebd20f | 822 | |
3d8df260 SK |
823 | #ifdef HAVE_DBUS |
824 | /* if we didn't create a DBus connection, retry now. */ | |
28866e95 | 825 | if (option_bool(OPT_DBUS) && !daemon->dbus) |
3d8df260 SK |
826 | { |
827 | char *err; | |
5aabfc78 | 828 | if ((err = dbus_init())) |
f2621c7f | 829 | my_syslog(LOG_WARNING, _("DBus error: %s"), err); |
3d8df260 | 830 | if (daemon->dbus) |
f2621c7f | 831 | my_syslog(LOG_INFO, _("connected to system DBus")); |
3d8df260 | 832 | } |
5aabfc78 | 833 | check_dbus_listeners(&rset, &wset, &eset); |
3d8df260 | 834 | #endif |
824af85b | 835 | |
5aabfc78 | 836 | check_dns_listeners(&rset, now); |
832af0ba SK |
837 | |
838 | #ifdef HAVE_TFTP | |
5aabfc78 | 839 | check_tftp_listeners(&rset, now); |
832af0ba SK |
840 | #endif |
841 | ||
7622fc06 | 842 | #ifdef HAVE_DHCP |
316e2730 SK |
843 | if (daemon->dhcp) |
844 | { | |
845 | if (FD_ISSET(daemon->dhcpfd, &rset)) | |
846 | dhcp_packet(now, 0); | |
847 | if (daemon->pxefd != -1 && FD_ISSET(daemon->pxefd, &rset)) | |
848 | dhcp_packet(now, 1); | |
849 | } | |
1697269c | 850 | |
52b92f4d | 851 | #ifdef HAVE_DHCP6 |
18c63eff SK |
852 | if (daemon->dhcp6 && FD_ISSET(daemon->dhcp6fd, &rset)) |
853 | dhcp6_packet(now); | |
c5ad4e79 | 854 | |
18c63eff SK |
855 | if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset)) |
856 | icmp6_packet(); | |
52b92f4d SK |
857 | #endif |
858 | ||
1f15b81d | 859 | # ifdef HAVE_SCRIPT |
1697269c | 860 | if (daemon->helperfd != -1 && FD_ISSET(daemon->helperfd, &wset)) |
5aabfc78 | 861 | helper_write(); |
7622fc06 | 862 | # endif |
5aabfc78 SK |
863 | #endif |
864 | ||
9e4abcb5 | 865 | } |
9e4abcb5 SK |
866 | } |
867 | ||
3be34541 SK |
868 | static void sig_handler(int sig) |
869 | { | |
5e9e0efb | 870 | if (pid == 0) |
3be34541 | 871 | { |
1697269c SK |
872 | /* ignore anything other than TERM during startup |
873 | and in helper proc. (helper ignore TERM too) */ | |
5e9e0efb | 874 | if (sig == SIGTERM) |
5aabfc78 | 875 | exit(EC_MISC); |
3be34541 | 876 | } |
5aabfc78 | 877 | else if (pid != getpid()) |
5e9e0efb | 878 | { |
1697269c | 879 | /* alarm is used to kill TCP children after a fixed time. */ |
5e9e0efb | 880 | if (sig == SIGALRM) |
7cebd20f | 881 | _exit(0); |
3be34541 | 882 | } |
5aabfc78 SK |
883 | else |
884 | { | |
885 | /* master process */ | |
886 | int event, errsave = errno; | |
887 | ||
888 | if (sig == SIGHUP) | |
889 | event = EVENT_RELOAD; | |
890 | else if (sig == SIGCHLD) | |
891 | event = EVENT_CHILD; | |
892 | else if (sig == SIGALRM) | |
893 | event = EVENT_ALARM; | |
894 | else if (sig == SIGTERM) | |
895 | event = EVENT_TERM; | |
896 | else if (sig == SIGUSR1) | |
897 | event = EVENT_DUMP; | |
898 | else if (sig == SIGUSR2) | |
899 | event = EVENT_REOPEN; | |
900 | else | |
901 | return; | |
902 | ||
c72daea8 | 903 | send_event(pipewrite, event, 0, NULL); |
5aabfc78 SK |
904 | errno = errsave; |
905 | } | |
906 | } | |
907 | ||
353ae4d2 SK |
908 | /* now == 0 -> queue immediate callback */ |
909 | void send_alarm(time_t event, time_t now) | |
741c2952 | 910 | { |
884a6dfe | 911 | if (now == 0 || event != 0) |
353ae4d2 | 912 | { |
884a6dfe SK |
913 | /* alarm(0) or alarm(-ve) doesn't do what we want.... */ |
914 | if ((now == 0 || difftime(event, now) <= 0.0)) | |
915 | send_event(pipewrite, EVENT_ALARM, 0, NULL); | |
916 | else | |
917 | alarm((unsigned)difftime(event, now)); | |
353ae4d2 | 918 | } |
741c2952 SK |
919 | } |
920 | ||
c72daea8 | 921 | void send_event(int fd, int event, int data, char *msg) |
5aabfc78 SK |
922 | { |
923 | struct event_desc ev; | |
c72daea8 SK |
924 | struct iovec iov[2]; |
925 | ||
5aabfc78 SK |
926 | ev.event = event; |
927 | ev.data = data; | |
c72daea8 SK |
928 | ev.msg_sz = msg ? strlen(msg) : 0; |
929 | ||
930 | iov[0].iov_base = &ev; | |
931 | iov[0].iov_len = sizeof(ev); | |
932 | iov[1].iov_base = msg; | |
933 | iov[1].iov_len = ev.msg_sz; | |
1a6bca81 SK |
934 | |
935 | /* error pipe, debug mode. */ | |
936 | if (fd == -1) | |
c72daea8 | 937 | fatal_event(&ev, msg); |
1a6bca81 SK |
938 | else |
939 | /* pipe is non-blocking and struct event_desc is smaller than | |
940 | PIPE_BUF, so this either fails or writes everything */ | |
c72daea8 | 941 | while (writev(fd, iov, msg ? 2 : 1) == -1 && errno == EINTR); |
5aabfc78 SK |
942 | } |
943 | ||
c72daea8 SK |
944 | /* NOTE: the memory used to return msg is leaked: use msgs in events only |
945 | to describe fatal errors. */ | |
946 | static int read_event(int fd, struct event_desc *evp, char **msg) | |
947 | { | |
948 | char *buf; | |
949 | ||
950 | if (!read_write(fd, (unsigned char *)evp, sizeof(struct event_desc), 1)) | |
951 | return 0; | |
952 | ||
953 | *msg = NULL; | |
954 | ||
955 | if (evp->msg_sz != 0 && | |
956 | (buf = malloc(evp->msg_sz + 1)) && | |
957 | read_write(fd, (unsigned char *)buf, evp->msg_sz, 1)) | |
958 | { | |
959 | buf[evp->msg_sz] = 0; | |
960 | *msg = buf; | |
961 | } | |
962 | ||
963 | return 1; | |
964 | } | |
965 | ||
966 | static void fatal_event(struct event_desc *ev, char *msg) | |
1a6bca81 SK |
967 | { |
968 | errno = ev->data; | |
969 | ||
970 | switch (ev->event) | |
971 | { | |
972 | case EVENT_DIE: | |
973 | exit(0); | |
7622fc06 SK |
974 | |
975 | case EVENT_FORK_ERR: | |
976 | die(_("cannot fork into background: %s"), NULL, EC_MISC); | |
1a6bca81 SK |
977 | |
978 | case EVENT_PIPE_ERR: | |
979 | die(_("failed to create helper: %s"), NULL, EC_MISC); | |
980 | ||
981 | case EVENT_CAP_ERR: | |
982 | die(_("setting capabilities failed: %s"), NULL, EC_MISC); | |
983 | ||
984 | case EVENT_USER_ERR: | |
c72daea8 | 985 | die(_("failed to change user-id to %s: %s"), msg, EC_MISC); |
1a6bca81 SK |
986 | |
987 | case EVENT_GROUP_ERR: | |
c72daea8 | 988 | die(_("failed to change group-id to %s: %s"), msg, EC_MISC); |
1a6bca81 SK |
989 | |
990 | case EVENT_PIDFILE: | |
c72daea8 | 991 | die(_("failed to open pidfile %s: %s"), msg, EC_FILE); |
1a6bca81 SK |
992 | |
993 | case EVENT_LOG_ERR: | |
c72daea8 SK |
994 | die(_("cannot open log %s: %s"), msg, EC_FILE); |
995 | ||
996 | case EVENT_LUA_ERR: | |
997 | die(_("failed to load Lua script: %s"), msg, EC_MISC); | |
1a6bca81 SK |
998 | } |
999 | } | |
1000 | ||
5aabfc78 SK |
1001 | static void async_event(int pipe, time_t now) |
1002 | { | |
1003 | pid_t p; | |
1004 | struct event_desc ev; | |
1005 | int i; | |
c72daea8 SK |
1006 | char *msg; |
1007 | ||
1008 | /* NOTE: the memory used to return msg is leaked: use msgs in events only | |
1009 | to describe fatal errors. */ | |
1010 | ||
1011 | if (read_event(pipe, &ev, &msg)) | |
5aabfc78 SK |
1012 | switch (ev.event) |
1013 | { | |
1014 | case EVENT_RELOAD: | |
1015 | clear_cache_and_reload(now); | |
28866e95 | 1016 | if (daemon->port != 0 && daemon->resolv_files && option_bool(OPT_NO_POLL)) |
5aabfc78 SK |
1017 | { |
1018 | reload_servers(daemon->resolv_files->name); | |
1019 | check_servers(); | |
1020 | } | |
7622fc06 | 1021 | #ifdef HAVE_DHCP |
5aabfc78 | 1022 | rerun_scripts(); |
7622fc06 | 1023 | #endif |
5aabfc78 SK |
1024 | break; |
1025 | ||
1026 | case EVENT_DUMP: | |
824af85b SK |
1027 | if (daemon->port != 0) |
1028 | dump_cache(now); | |
5aabfc78 SK |
1029 | break; |
1030 | ||
1031 | case EVENT_ALARM: | |
7622fc06 | 1032 | #ifdef HAVE_DHCP |
52b92f4d | 1033 | if (daemon->dhcp || daemon->dhcp6) |
5aabfc78 SK |
1034 | { |
1035 | lease_prune(NULL, now); | |
1036 | lease_update_file(now); | |
1037 | } | |
843c96b4 SK |
1038 | #ifdef HAVE_DHCP6 |
1039 | else if (daemon->ra_contexts) | |
353ae4d2 SK |
1040 | /* Not doing DHCP, so no lease system, manage alarms for ra only */ |
1041 | send_alarm(periodic_ra(now), now); | |
843c96b4 | 1042 | #endif |
7622fc06 | 1043 | #endif |
5aabfc78 SK |
1044 | break; |
1045 | ||
1046 | case EVENT_CHILD: | |
1047 | /* See Stevens 5.10 */ | |
1048 | while ((p = waitpid(-1, NULL, WNOHANG)) != 0) | |
1049 | if (p == -1) | |
1050 | { | |
1051 | if (errno != EINTR) | |
1052 | break; | |
1053 | } | |
1054 | else | |
1055 | for (i = 0 ; i < MAX_PROCS; i++) | |
1056 | if (daemon->tcp_pids[i] == p) | |
1057 | daemon->tcp_pids[i] = 0; | |
1058 | break; | |
1059 | ||
1060 | case EVENT_KILLED: | |
c72daea8 | 1061 | my_syslog(LOG_WARNING, _("script process killed by signal %d"), ev.data); |
5aabfc78 SK |
1062 | break; |
1063 | ||
1064 | case EVENT_EXITED: | |
c72daea8 | 1065 | my_syslog(LOG_WARNING, _("script process exited with status %d"), ev.data); |
5aabfc78 SK |
1066 | break; |
1067 | ||
1068 | case EVENT_EXEC_ERR: | |
9e038946 SK |
1069 | my_syslog(LOG_ERR, _("failed to execute %s: %s"), |
1070 | daemon->lease_change_command, strerror(ev.data)); | |
5aabfc78 SK |
1071 | break; |
1072 | ||
1a6bca81 | 1073 | /* necessary for fatal errors in helper */ |
c72daea8 | 1074 | case EVENT_USER_ERR: |
1a6bca81 | 1075 | case EVENT_DIE: |
c72daea8 SK |
1076 | case EVENT_LUA_ERR: |
1077 | fatal_event(&ev, msg); | |
9e038946 SK |
1078 | break; |
1079 | ||
5aabfc78 SK |
1080 | case EVENT_REOPEN: |
1081 | /* Note: this may leave TCP-handling processes with the old file still open. | |
1082 | Since any such process will die in CHILD_LIFETIME or probably much sooner, | |
1083 | we leave them logging to the old file. */ | |
1084 | if (daemon->log_file != NULL) | |
1085 | log_reopen(daemon->log_file); | |
1086 | break; | |
1087 | ||
1088 | case EVENT_TERM: | |
1089 | /* Knock all our children on the head. */ | |
1090 | for (i = 0; i < MAX_PROCS; i++) | |
1091 | if (daemon->tcp_pids[i] != 0) | |
1092 | kill(daemon->tcp_pids[i], SIGALRM); | |
1093 | ||
c72daea8 | 1094 | #if defined(HAVE_SCRIPT) |
5aabfc78 SK |
1095 | /* handle pending lease transitions */ |
1096 | if (daemon->helperfd != -1) | |
1097 | { | |
1098 | /* block in writes until all done */ | |
1099 | if ((i = fcntl(daemon->helperfd, F_GETFL)) != -1) | |
1100 | fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK); | |
1101 | do { | |
1102 | helper_write(); | |
1103 | } while (!helper_buf_empty() || do_script_run(now)); | |
1104 | close(daemon->helperfd); | |
1105 | } | |
1106 | #endif | |
1107 | ||
1108 | if (daemon->lease_stream) | |
1109 | fclose(daemon->lease_stream); | |
73a08a24 SK |
1110 | |
1111 | if (daemon->runfile) | |
1112 | unlink(daemon->runfile); | |
5aabfc78 SK |
1113 | |
1114 | my_syslog(LOG_INFO, _("exiting on receipt of SIGTERM")); | |
1115 | flush_log(); | |
1116 | exit(EC_GOOD); | |
1117 | } | |
3be34541 SK |
1118 | } |
1119 | ||
8ef5ada2 | 1120 | void poll_resolv(int force, int do_reload, time_t now) |
5aabfc78 SK |
1121 | { |
1122 | struct resolvc *res, *latest; | |
1123 | struct stat statbuf; | |
1124 | time_t last_change = 0; | |
1125 | /* There may be more than one possible file. | |
1126 | Go through and find the one which changed _last_. | |
1127 | Warn of any which can't be read. */ | |
8ef5ada2 | 1128 | |
28866e95 | 1129 | if (daemon->port == 0 || option_bool(OPT_NO_POLL)) |
8ef5ada2 SK |
1130 | return; |
1131 | ||
5aabfc78 SK |
1132 | for (latest = NULL, res = daemon->resolv_files; res; res = res->next) |
1133 | if (stat(res->name, &statbuf) == -1) | |
1134 | { | |
8ef5ada2 SK |
1135 | if (force) |
1136 | { | |
1137 | res->mtime = 0; | |
1138 | continue; | |
1139 | } | |
1140 | ||
5aabfc78 SK |
1141 | if (!res->logged) |
1142 | my_syslog(LOG_WARNING, _("failed to access %s: %s"), res->name, strerror(errno)); | |
1143 | res->logged = 1; | |
8ef5ada2 SK |
1144 | |
1145 | if (res->mtime != 0) | |
1146 | { | |
1147 | /* existing file evaporated, force selection of the latest | |
1148 | file even if its mtime hasn't changed since we last looked */ | |
1149 | poll_resolv(1, do_reload, now); | |
1150 | return; | |
1151 | } | |
5aabfc78 SK |
1152 | } |
1153 | else | |
1154 | { | |
1155 | res->logged = 0; | |
8ef5ada2 SK |
1156 | if (force || (statbuf.st_mtime != res->mtime)) |
1157 | { | |
1158 | res->mtime = statbuf.st_mtime; | |
5aabfc78 SK |
1159 | if (difftime(statbuf.st_mtime, last_change) > 0.0) |
1160 | { | |
1161 | last_change = statbuf.st_mtime; | |
1162 | latest = res; | |
1163 | } | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | if (latest) | |
1168 | { | |
1169 | static int warned = 0; | |
1170 | if (reload_servers(latest->name)) | |
1171 | { | |
1172 | my_syslog(LOG_INFO, _("reading %s"), latest->name); | |
1173 | warned = 0; | |
1174 | check_servers(); | |
28866e95 | 1175 | if (option_bool(OPT_RELOAD) && do_reload) |
8ef5ada2 | 1176 | clear_cache_and_reload(now); |
5aabfc78 SK |
1177 | } |
1178 | else | |
1179 | { | |
1180 | latest->mtime = 0; | |
1181 | if (!warned) | |
1182 | { | |
1183 | my_syslog(LOG_WARNING, _("no servers found in %s, will retry"), latest->name); | |
1184 | warned = 1; | |
1185 | } | |
1186 | } | |
1187 | } | |
1188 | } | |
3d8df260 | 1189 | |
5aabfc78 | 1190 | void clear_cache_and_reload(time_t now) |
3d8df260 | 1191 | { |
824af85b | 1192 | if (daemon->port != 0) |
7622fc06 | 1193 | cache_reload(); |
824af85b | 1194 | |
7622fc06 | 1195 | #ifdef HAVE_DHCP |
52b92f4d | 1196 | if (daemon->dhcp || daemon->dhcp6) |
3d8df260 | 1197 | { |
28866e95 | 1198 | if (option_bool(OPT_ETHERS)) |
5aabfc78 | 1199 | dhcp_read_ethers(); |
824af85b | 1200 | reread_dhcp(); |
3d8df260 | 1201 | dhcp_update_configs(daemon->dhcp_conf); |
824af85b | 1202 | check_dhcp_hosts(0); |
5aabfc78 SK |
1203 | lease_update_from_configs(); |
1204 | lease_update_file(now); | |
353ae4d2 | 1205 | lease_update_dns(1); |
3d8df260 | 1206 | } |
843c96b4 SK |
1207 | #ifdef HAVE_DHCP6 |
1208 | else if (daemon->ra_contexts) | |
2021c662 SK |
1209 | /* Not doing DHCP, so no lease system, manage |
1210 | alarms for ra only */ | |
1211 | send_alarm(periodic_ra(now), now); | |
843c96b4 | 1212 | #endif |
7622fc06 | 1213 | #endif |
3d8df260 SK |
1214 | } |
1215 | ||
5aabfc78 | 1216 | static int set_dns_listeners(time_t now, fd_set *set, int *maxfdp) |
3be34541 SK |
1217 | { |
1218 | struct serverfd *serverfdp; | |
1219 | struct listener *listener; | |
824af85b | 1220 | int wait = 0, i; |
832af0ba SK |
1221 | |
1222 | #ifdef HAVE_TFTP | |
1223 | int tftp = 0; | |
1224 | struct tftp_transfer *transfer; | |
1225 | for (transfer = daemon->tftp_trans; transfer; transfer = transfer->next) | |
1226 | { | |
1227 | tftp++; | |
1228 | FD_SET(transfer->sockfd, set); | |
1229 | bump_maxfd(transfer->sockfd, maxfdp); | |
1230 | } | |
1231 | #endif | |
1232 | ||
1697269c | 1233 | /* will we be able to get memory? */ |
824af85b SK |
1234 | if (daemon->port != 0) |
1235 | get_new_frec(now, &wait); | |
1697269c | 1236 | |
3be34541 SK |
1237 | for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next) |
1238 | { | |
1239 | FD_SET(serverfdp->fd, set); | |
1697269c | 1240 | bump_maxfd(serverfdp->fd, maxfdp); |
3be34541 | 1241 | } |
1a6bca81 SK |
1242 | |
1243 | if (daemon->port != 0 && !daemon->osport) | |
1244 | for (i = 0; i < RANDOM_SOCKS; i++) | |
1245 | if (daemon->randomsocks[i].refcount != 0) | |
1246 | { | |
1247 | FD_SET(daemon->randomsocks[i].fd, set); | |
1248 | bump_maxfd(daemon->randomsocks[i].fd, maxfdp); | |
1249 | } | |
1250 | ||
3be34541 SK |
1251 | for (listener = daemon->listeners; listener; listener = listener->next) |
1252 | { | |
1697269c | 1253 | /* only listen for queries if we have resources */ |
824af85b | 1254 | if (listener->fd != -1 && wait == 0) |
1697269c SK |
1255 | { |
1256 | FD_SET(listener->fd, set); | |
1257 | bump_maxfd(listener->fd, maxfdp); | |
1258 | } | |
1259 | ||
1260 | /* death of a child goes through the select loop, so | |
1261 | we don't need to explicitly arrange to wake up here */ | |
824af85b SK |
1262 | if (listener->tcpfd != -1) |
1263 | for (i = 0; i < MAX_PROCS; i++) | |
1264 | if (daemon->tcp_pids[i] == 0) | |
1265 | { | |
1266 | FD_SET(listener->tcpfd, set); | |
1267 | bump_maxfd(listener->tcpfd, maxfdp); | |
1268 | break; | |
1269 | } | |
9e4abcb5 | 1270 | |
832af0ba SK |
1271 | #ifdef HAVE_TFTP |
1272 | if (tftp <= daemon->tftp_max && listener->tftpfd != -1) | |
1273 | { | |
1274 | FD_SET(listener->tftpfd, set); | |
1275 | bump_maxfd(listener->tftpfd, maxfdp); | |
1276 | } | |
1277 | #endif | |
1278 | ||
1279 | } | |
1280 | ||
1697269c | 1281 | return wait; |
3be34541 | 1282 | } |
9e4abcb5 | 1283 | |
5aabfc78 | 1284 | static void check_dns_listeners(fd_set *set, time_t now) |
3be34541 SK |
1285 | { |
1286 | struct serverfd *serverfdp; | |
1a6bca81 SK |
1287 | struct listener *listener; |
1288 | int i; | |
1289 | ||
832af0ba SK |
1290 | for (serverfdp = daemon->sfds; serverfdp; serverfdp = serverfdp->next) |
1291 | if (FD_ISSET(serverfdp->fd, set)) | |
1a6bca81 SK |
1292 | reply_query(serverfdp->fd, serverfdp->source_addr.sa.sa_family, now); |
1293 | ||
1294 | if (daemon->port != 0 && !daemon->osport) | |
1295 | for (i = 0; i < RANDOM_SOCKS; i++) | |
1296 | if (daemon->randomsocks[i].refcount != 0 && | |
1297 | FD_ISSET(daemon->randomsocks[i].fd, set)) | |
1298 | reply_query(daemon->randomsocks[i].fd, daemon->randomsocks[i].family, now); | |
832af0ba SK |
1299 | |
1300 | for (listener = daemon->listeners; listener; listener = listener->next) | |
1301 | { | |
824af85b | 1302 | if (listener->fd != -1 && FD_ISSET(listener->fd, set)) |
5aabfc78 | 1303 | receive_query(listener, now); |
1a6bca81 | 1304 | |
832af0ba SK |
1305 | #ifdef HAVE_TFTP |
1306 | if (listener->tftpfd != -1 && FD_ISSET(listener->tftpfd, set)) | |
5aabfc78 | 1307 | tftp_request(listener, now); |
832af0ba | 1308 | #endif |
3be34541 | 1309 | |
824af85b | 1310 | if (listener->tcpfd != -1 && FD_ISSET(listener->tcpfd, set)) |
832af0ba SK |
1311 | { |
1312 | int confd; | |
1313 | struct irec *iface = NULL; | |
1314 | pid_t p; | |
52d4abf2 SK |
1315 | union mysockaddr tcp_addr; |
1316 | socklen_t tcp_len = sizeof(union mysockaddr); | |
1317 | ||
1318 | while ((confd = accept(listener->tcpfd, NULL, NULL)) == -1 && errno == EINTR); | |
832af0ba | 1319 | |
52d4abf2 SK |
1320 | if (confd == -1 || |
1321 | getsockname(confd, (struct sockaddr *)&tcp_addr, &tcp_len) == -1) | |
832af0ba SK |
1322 | continue; |
1323 | ||
28866e95 | 1324 | if (option_bool(OPT_NOWILD)) |
52d4abf2 | 1325 | iface = listener->iface; /* May be NULL */ |
832af0ba SK |
1326 | else |
1327 | { | |
832af0ba SK |
1328 | /* Check for allowed interfaces when binding the wildcard address: |
1329 | we do this by looking for an interface with the same address as | |
1330 | the local address of the TCP connection, then looking to see if that's | |
1331 | an allowed interface. As a side effect, we get the netmask of the | |
1332 | interface too, for localisation. */ | |
3be34541 | 1333 | |
832af0ba | 1334 | /* interface may be new since startup */ |
52d4abf2 | 1335 | if (enumerate_interfaces()) |
832af0ba SK |
1336 | for (iface = daemon->interfaces; iface; iface = iface->next) |
1337 | if (sockaddr_isequal(&iface->addr, &tcp_addr)) | |
1338 | break; | |
1339 | } | |
1340 | ||
52d4abf2 | 1341 | if (!iface && !option_bool(OPT_NOWILD)) |
832af0ba SK |
1342 | { |
1343 | shutdown(confd, SHUT_RDWR); | |
1344 | close(confd); | |
1345 | } | |
59353a6b | 1346 | #ifndef NO_FORK |
28866e95 | 1347 | else if (!option_bool(OPT_DEBUG) && (p = fork()) != 0) |
832af0ba SK |
1348 | { |
1349 | if (p != -1) | |
1350 | { | |
1351 | int i; | |
1352 | for (i = 0; i < MAX_PROCS; i++) | |
1353 | if (daemon->tcp_pids[i] == 0) | |
1354 | { | |
1355 | daemon->tcp_pids[i] = p; | |
1356 | break; | |
1357 | } | |
1358 | } | |
1359 | close(confd); | |
1360 | } | |
1361 | #endif | |
1362 | else | |
1363 | { | |
1364 | unsigned char *buff; | |
1365 | struct server *s; | |
1366 | int flags; | |
52d4abf2 SK |
1367 | struct in_addr netmask; |
1368 | ||
1369 | if (iface) | |
1370 | netmask = iface->netmask; | |
1371 | else | |
1372 | netmask.s_addr = 0; | |
1373 | ||
8ef5ada2 SK |
1374 | #ifndef NO_FORK |
1375 | /* Arrange for SIGALARM after CHILD_LIFETIME seconds to | |
1376 | terminate the process. */ | |
28866e95 | 1377 | if (!option_bool(OPT_DEBUG)) |
832af0ba | 1378 | alarm(CHILD_LIFETIME); |
8ef5ada2 SK |
1379 | #endif |
1380 | ||
832af0ba SK |
1381 | /* start with no upstream connections. */ |
1382 | for (s = daemon->servers; s; s = s->next) | |
7cebd20f | 1383 | s->tcpfd = -1; |
832af0ba SK |
1384 | |
1385 | /* The connected socket inherits non-blocking | |
1386 | attribute from the listening socket. | |
1387 | Reset that here. */ | |
1388 | if ((flags = fcntl(confd, F_GETFL, 0)) != -1) | |
1389 | fcntl(confd, F_SETFL, flags & ~O_NONBLOCK); | |
1390 | ||
52d4abf2 | 1391 | buff = tcp_request(confd, now, &tcp_addr, netmask); |
7cebd20f | 1392 | |
832af0ba SK |
1393 | shutdown(confd, SHUT_RDWR); |
1394 | close(confd); | |
1395 | ||
1396 | if (buff) | |
1397 | free(buff); | |
1398 | ||
1399 | for (s = daemon->servers; s; s = s->next) | |
1400 | if (s->tcpfd != -1) | |
1401 | { | |
1402 | shutdown(s->tcpfd, SHUT_RDWR); | |
1403 | close(s->tcpfd); | |
1404 | } | |
7cebd20f | 1405 | #ifndef NO_FORK |
28866e95 | 1406 | if (!option_bool(OPT_DEBUG)) |
5aabfc78 SK |
1407 | { |
1408 | flush_log(); | |
1409 | _exit(0); | |
1410 | } | |
59353a6b | 1411 | #endif |
832af0ba SK |
1412 | } |
1413 | } | |
1414 | } | |
3be34541 SK |
1415 | } |
1416 | ||
7622fc06 | 1417 | #ifdef HAVE_DHCP |
5e9e0efb SK |
1418 | int make_icmp_sock(void) |
1419 | { | |
7cebd20f | 1420 | int fd; |
5e9e0efb SK |
1421 | int zeroopt = 0; |
1422 | ||
1423 | if ((fd = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP)) != -1) | |
1424 | { | |
7cebd20f | 1425 | if (!fix_fd(fd) || |
5e9e0efb SK |
1426 | setsockopt(fd, SOL_SOCKET, SO_DONTROUTE, &zeroopt, sizeof(zeroopt)) == -1) |
1427 | { | |
1428 | close(fd); | |
1429 | fd = -1; | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | return fd; | |
1434 | } | |
1435 | ||
5aabfc78 | 1436 | int icmp_ping(struct in_addr addr) |
3be34541 | 1437 | { |
5e9e0efb | 1438 | /* Try and get an ICMP echo from a machine. */ |
3be34541 SK |
1439 | |
1440 | /* Note that whilst in the three second wait, we check for | |
832af0ba | 1441 | (and service) events on the DNS and TFTP sockets, (so doing that |
3be34541 SK |
1442 | better not use any resources our caller has in use...) |
1443 | but we remain deaf to signals or further DHCP packets. */ | |
1444 | ||
5e9e0efb | 1445 | int fd; |
3be34541 SK |
1446 | struct sockaddr_in saddr; |
1447 | struct { | |
1448 | struct ip ip; | |
1449 | struct icmp icmp; | |
1450 | } packet; | |
1451 | unsigned short id = rand16(); | |
1452 | unsigned int i, j; | |
5e9e0efb | 1453 | int gotreply = 0; |
3be34541 | 1454 | time_t start, now; |
5e9e0efb | 1455 | |
824af85b | 1456 | #if defined(HAVE_LINUX_NETWORK) || defined (HAVE_SOLARIS_NETWORK) |
5e9e0efb SK |
1457 | if ((fd = make_icmp_sock()) == -1) |
1458 | return 0; | |
1459 | #else | |
1460 | int opt = 2000; | |
1461 | fd = daemon->dhcp_icmp_fd; | |
1462 | setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt)); | |
1463 | #endif | |
1464 | ||
3be34541 SK |
1465 | saddr.sin_family = AF_INET; |
1466 | saddr.sin_port = 0; | |
1467 | saddr.sin_addr = addr; | |
1468 | #ifdef HAVE_SOCKADDR_SA_LEN | |
1469 | saddr.sin_len = sizeof(struct sockaddr_in); | |
1470 | #endif | |
1471 | ||
1472 | memset(&packet.icmp, 0, sizeof(packet.icmp)); | |
1473 | packet.icmp.icmp_type = ICMP_ECHO; | |
1474 | packet.icmp.icmp_id = id; | |
1475 | for (j = 0, i = 0; i < sizeof(struct icmp) / 2; i++) | |
1476 | j += ((u16 *)&packet.icmp)[i]; | |
1477 | while (j>>16) | |
1478 | j = (j & 0xffff) + (j >> 16); | |
1479 | packet.icmp.icmp_cksum = (j == 0xffff) ? j : ~j; | |
1480 | ||
5e9e0efb | 1481 | while (sendto(fd, (char *)&packet.icmp, sizeof(struct icmp), 0, |
fd9fa481 SK |
1482 | (struct sockaddr *)&saddr, sizeof(saddr)) == -1 && |
1483 | retry_send()); | |
1484 | ||
5e9e0efb SK |
1485 | for (now = start = dnsmasq_time(); |
1486 | difftime(now, start) < (float)PING_WAIT;) | |
fd9fa481 SK |
1487 | { |
1488 | struct timeval tv; | |
f2621c7f | 1489 | fd_set rset, wset; |
fd9fa481 | 1490 | struct sockaddr_in faddr; |
1697269c | 1491 | int maxfd = fd; |
3d8df260 | 1492 | socklen_t len = sizeof(faddr); |
fd9fa481 SK |
1493 | |
1494 | tv.tv_usec = 250000; | |
1495 | tv.tv_sec = 0; | |
1496 | ||
1497 | FD_ZERO(&rset); | |
f2621c7f | 1498 | FD_ZERO(&wset); |
5e9e0efb | 1499 | FD_SET(fd, &rset); |
5aabfc78 | 1500 | set_dns_listeners(now, &rset, &maxfd); |
f2621c7f | 1501 | set_log_writer(&wset, &maxfd); |
c5ad4e79 SK |
1502 | |
1503 | #ifdef HAVE_DHCP6 | |
843c96b4 | 1504 | if (daemon->ra_contexts) |
c5ad4e79 SK |
1505 | { |
1506 | FD_SET(daemon->icmp6fd, &rset); | |
1507 | bump_maxfd(daemon->icmp6fd, &maxfd); | |
1508 | } | |
1509 | #endif | |
1510 | ||
f2621c7f SK |
1511 | if (select(maxfd+1, &rset, &wset, NULL, &tv) < 0) |
1512 | { | |
1513 | FD_ZERO(&rset); | |
1514 | FD_ZERO(&wset); | |
1515 | } | |
1516 | ||
5e9e0efb | 1517 | now = dnsmasq_time(); |
f2621c7f SK |
1518 | |
1519 | check_log_writer(&wset); | |
5aabfc78 | 1520 | check_dns_listeners(&rset, now); |
832af0ba | 1521 | |
c5ad4e79 | 1522 | #ifdef HAVE_DHCP6 |
843c96b4 | 1523 | if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset)) |
c5ad4e79 SK |
1524 | icmp6_packet(); |
1525 | #endif | |
1526 | ||
832af0ba | 1527 | #ifdef HAVE_TFTP |
5aabfc78 | 1528 | check_tftp_listeners(&rset, now); |
832af0ba SK |
1529 | #endif |
1530 | ||
5e9e0efb SK |
1531 | if (FD_ISSET(fd, &rset) && |
1532 | recvfrom(fd, &packet, sizeof(packet), 0, | |
fd9fa481 SK |
1533 | (struct sockaddr *)&faddr, &len) == sizeof(packet) && |
1534 | saddr.sin_addr.s_addr == faddr.sin_addr.s_addr && | |
1535 | packet.icmp.icmp_type == ICMP_ECHOREPLY && | |
1536 | packet.icmp.icmp_seq == 0 && | |
1537 | packet.icmp.icmp_id == id) | |
1538 | { | |
1539 | gotreply = 1; | |
1540 | break; | |
1541 | } | |
1542 | } | |
1543 | ||
824af85b | 1544 | #if defined(HAVE_LINUX_NETWORK) || defined(HAVE_SOLARIS_NETWORK) |
5e9e0efb SK |
1545 | close(fd); |
1546 | #else | |
3be34541 | 1547 | opt = 1; |
5e9e0efb SK |
1548 | setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt)); |
1549 | #endif | |
1550 | ||
3be34541 SK |
1551 | return gotreply; |
1552 | } | |
7622fc06 | 1553 | #endif |
0a852541 SK |
1554 | |
1555 |