xref: /third_party/toybox/toys/pending/dhcp6.c (revision 0f66f451) 
1/* dhcp6.c - DHCP6 client for dynamic network configuration.
2 *
3 * Copyright 2015 Rajni Kant <rajnikant12345@gmail.com>
4 *
5 * Not in SUSv4.
6USE_DHCP6(NEWTOY(dhcp6, "r:A#<0T#<0t#<0s:p:i:SRvqnbf", TOYFLAG_SBIN|TOYFLAG_ROOTONLY))
7
8config DHCP6
9  bool "dhcp6"
10  default n
11  help
12  usage: dhcp6 [-fbnqvR] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]
13
14        Configure network dynamically using DHCP.
15
16      -i Interface to use (default eth0)
17      -p Create pidfile
18      -s Run PROG at DHCP events
19      -t Send up to N Solicit packets
20      -T Pause between packets (default 3 seconds)
21      -A Wait N seconds after failure (default 20)
22      -f Run in foreground
23      -b Background if lease is not obtained
24      -n Exit if lease is not obtained
25      -q Exit after obtaining lease
26      -R Release IP on exit
27      -S Log to syslog too
28      -r Request this IP address
29      -v Verbose
30
31      Signals:
32      USR1  Renew current lease
33      USR2  Release current lease
34*/
35#define FOR_dhcp6
36#include "toys.h"
37#include <linux/sockios.h>
38#include <linux/if_ether.h>
39#include <netinet/ip.h>
40#include <netinet/ip6.h>
41#include <netinet/udp.h>
42#include <linux/if_packet.h>
43#include <syslog.h>
44
45GLOBALS(
46  char *interface_name, *pidfile, *script;
47  long retry, timeout, errortimeout;
48  char *req_ip;
49  int length, state, request_length, sock, sock1, status, retval, retries;
50  struct timeval tv;
51  uint8_t transction_id[3];
52  struct sockaddr_in6 input_socket6;
53)
54
55#define DHCP6SOLICIT        1
56#define DHCP6ADVERTISE      2   // server -> client
57#define DHCP6REQUEST        3
58#define DHCP6CONFIRM        4
59#define DHCP6RENEW          5
60#define DHCP6REBIND         6
61#define DHCP6REPLY          7   // server -> client
62#define DHCP6RELEASE        8
63#define DHCP6DECLINE        9
64#define DHCP6RECONFIGURE    10  // server -> client
65#define DHCP6INFOREQUEST    11
66#define DHCP6RELAYFLOW      12  // relay -> relay/server
67#define DHCP6RELAYREPLY     13  // server/relay -> relay
68
69// DHCPv6 option codes (partial). See RFC 3315
70#define DHCP6_OPT_CLIENTID      1
71#define DHCP6_OPT_SERVERID      2
72#define DHCP6_OPT_IA_NA         3
73#define DHCP6_OPT_IA_ADDR       5
74#define DHCP6_OPT_ORO           6
75#define DHCP6_OPT_PREFERENCE    7
76#define DHCP6_OPT_ELAPSED_TIME  8
77#define DHCP6_OPT_RELAY_MSG     9
78#define DHCP6_OPT_STATUS_CODE   13
79#define DHCP6_OPT_IA_PD         25
80#define DHCP6_OPT_IA_PREFIX     26
81
82#define DHCP6_STATUS_SUCCESS        0
83#define DHCP6_STATUS_NOADDRSAVAIL   2
84
85#define DHCP6_DUID_LLT    1
86#define DHCP6_DUID_EN     2
87#define DHCP6_DUID_LL     3
88#define DHCP6_DUID_UUID   4
89
90#define DHCPC_SERVER_PORT     547
91#define DHCPC_CLIENT_PORT     546
92
93#define LOG_SILENT          0x0
94#define LOG_CONSOLE         0x1
95#define LOG_SYSTEM          0x2
96
97typedef struct __attribute__((packed)) dhcp6_msg_s {
98  uint8_t msgtype, transaction_id[3], options[524];
99} dhcp6_msg_t;
100
101typedef struct __attribute__((packed)) optval_duid_llt {
102  uint16_t type;
103  uint16_t hwtype;
104  uint32_t time;
105  uint8_t lladdr[6];
106} DUID;
107
108typedef struct __attribute__((packed)) optval_ia_na {
109  uint32_t iaid, t1, t2;
110} IA_NA;
111
112typedef struct __attribute__((packed)) dhcp6_raw_s {
113  struct ip6_hdr iph;
114  struct udphdr udph;
115  dhcp6_msg_t dhcp6;
116} dhcp6_raw_t;
117
118typedef struct __attribute__((packed)) dhcp_data_client {
119  uint16_t  status_code;
120  uint32_t iaid , t1,t2, pf_lf, va_lf;
121  uint8_t ipaddr[17] ;
122} DHCP_DATA;
123
124static DHCP_DATA dhcp_data;
125static dhcp6_raw_t *mymsg;
126static dhcp6_msg_t mesg;
127static DUID *duid;
128
129static void (*dbg)(char *format, ...);
130static void dummy(char *format, ...)
131{
132  return;
133}
134
135static void logit(char *format, ...)
136{
137  int used;
138  char *msg;
139  va_list p, t;
140  uint8_t infomode = LOG_SILENT;
141
142  if (toys.optflags & FLAG_S) infomode |= LOG_SYSTEM;
143  if(toys.optflags & FLAG_v) infomode |= LOG_CONSOLE;
144  va_start(p, format);
145  va_copy(t, p);
146  used = vsnprintf(NULL, 0, format, t);
147  used++;
148  va_end(t);
149
150  msg = xmalloc(used);
151  vsnprintf(msg, used, format, p);
152  va_end(p);
153
154  if (infomode & LOG_SYSTEM) syslog(LOG_INFO, "%s", msg);
155  if (infomode & LOG_CONSOLE) printf("%s", msg);
156  free(msg);
157  return;
158}
159
160static void get_mac(uint8_t *mac, char *interface)
161{
162  int fd;
163  struct ifreq req;
164
165  if (!mac) return;
166  fd = xsocket(AF_INET6, SOCK_RAW, IPPROTO_RAW);
167  req.ifr_addr.sa_family = AF_INET6;
168  xstrncpy(req.ifr_name, interface, IFNAMSIZ);
169  xioctl(fd, SIOCGIFHWADDR, &req);
170  memcpy(mac, req.ifr_hwaddr.sa_data, 6);
171  xclose(fd);
172}
173
174static void fill_option(uint16_t option_id, uint16_t option_len, uint8_t **dhmesg)
175{
176  uint8_t *tmp = *dhmesg;
177
178  *((uint16_t*)tmp) = htons(option_id);
179  *(uint16_t*)(tmp+2) = htons(option_len);
180  *dhmesg += 4;
181  TT.length += 4;
182}
183
184static void fill_clientID()
185{
186  uint8_t *tmp = &mesg.options[TT.length];
187
188  if(!duid) {
189    uint8_t mac[7] = {0,};
190    duid = (DUID*)malloc(sizeof(DUID));
191    duid->type = htons(1);
192    duid->hwtype = htons(1);
193    duid->time = htonl((uint32_t)(time(NULL) - 946684800) & 0xffffffff);
194    fill_option(DHCP6_OPT_CLIENTID,14,&tmp);
195    get_mac(mac, TT.interface_name);
196    memcpy(duid->lladdr,mac, 6);
197    memcpy(tmp,(uint8_t*)duid,sizeof(DUID));
198  }
199  else {
200    fill_option(DHCP6_OPT_CLIENTID,14,&tmp);
201    memcpy(tmp,(uint8_t*)duid,sizeof(DUID));
202  }
203  TT.length += sizeof(DUID);
204}
205
206// TODO: make it generic for multiple options.
207static void fill_optionRequest()
208{
209  uint8_t *tmp = &mesg.options[TT.length];
210
211  fill_option(DHCP6_OPT_ORO,4,&tmp);
212  *(uint16_t*)(tmp+4) = htons(23);
213  *(uint16_t*)(tmp+6) = htons(24);
214  TT.length += 4;
215}
216
217static void fill_elapsedTime()
218{
219  uint8_t *tmp = &mesg.options[TT.length];
220
221  fill_option(DHCP6_OPT_ELAPSED_TIME, 2, &tmp);
222  *(uint16_t*)(tmp+6) = htons(0);
223  TT.length += 2;
224}
225
226static void fill_iaid()
227{
228  IA_NA iana;
229  uint8_t *tmp = &mesg.options[TT.length];
230
231  fill_option(DHCP6_OPT_IA_NA, 12, &tmp);
232  iana.iaid = rand();
233  iana.t1 = 0xffffffff;
234  iana.t2 = 0xffffffff;
235  memcpy(tmp, (uint8_t*)&iana, sizeof(IA_NA));
236  TT.length += sizeof(IA_NA);
237}
238
239//static void mode_raw(int *sock_t)
240static void mode_raw()
241{
242  int constone = 1;
243  struct sockaddr_ll sockll;
244
245  if (TT.sock > 0) xclose(TT.sock);
246  TT.sock = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IPV6));
247
248  memset(&sockll, 0, sizeof(sockll));
249  sockll.sll_family = AF_PACKET;
250  sockll.sll_protocol = htons(ETH_P_IPV6);
251  sockll.sll_ifindex = if_nametoindex(TT.interface_name);
252  xbind(TT.sock, (struct sockaddr *) &sockll, sizeof(sockll));
253  if (setsockopt(TT.sock, SOL_PACKET, PACKET_HOST,&constone, sizeof(int)) < 0) {
254    if (errno != ENOPROTOOPT) error_exit("MODE RAW : Bind fail.\n");
255  }
256}
257
258static void generate_transection_id()
259{
260  int i, r = rand() % 0xffffff;
261
262  for (i=0; i<3; i++) {
263    TT.transction_id[i] = r%0xff;
264    r = r/10;
265  }
266}
267
268static void set_timeout(int seconds)
269{
270  TT.tv.tv_sec = seconds;
271  TT.tv.tv_usec = 100000;
272}
273
274static void  send_msg(int type)
275{
276  struct sockaddr_in6 addr6;
277  int sendlength = 0;
278
279  memset(&addr6, 0, sizeof(addr6));
280  addr6.sin6_family = AF_INET6;
281  addr6.sin6_port = htons(DHCPC_SERVER_PORT); //SERVER_PORT
282  inet_pton(AF_INET6, "ff02::1:2", &addr6.sin6_addr);
283  mesg.msgtype = type;
284  generate_transection_id();
285  memcpy(mesg.transaction_id, TT.transction_id, 3);
286
287  if (type  == DHCP6SOLICIT) {
288    TT.length = 0;
289    fill_clientID();
290    fill_optionRequest();
291    fill_elapsedTime();
292    fill_iaid();
293    sendlength = sizeof(dhcp6_msg_t) - 524 + TT.length;
294  } else if (type == DHCP6REQUEST || type == DHCP6RELEASE || type == DHCP6RENEW)
295    sendlength = TT.request_length;
296  dbg("Sending message type: %d\n", type);
297  sendlength = sendto(TT.sock1, &mesg, sendlength , 0,(struct sockaddr *)&addr6,
298          sizeof(struct sockaddr_in6 ));
299  if (sendlength <= 0) dbg("Error in sending message type: %d\n", type);
300}
301
302uint8_t *get_msg_ptr(uint8_t *data, int data_length, int msgtype)
303{
304  uint16_t type =  *((uint16_t*)data), length = *((uint16_t*)(data+2));
305
306  type = ntohs(type);
307  if (type == msgtype) return data;
308  length = ntohs(length);
309  while (type != msgtype) {
310    data_length -= (4 + length);
311    if (data_length <= 0) break;
312    data = data + 4 + length;
313    type = ntohs(*((uint16_t*)data));
314    length = ntohs(*((uint16_t*)(data+2)));
315    if (type == msgtype) return data;
316  }
317  return NULL;
318}
319
320static uint8_t *check_server_id(uint8_t *data, int data_length)
321{
322  return get_msg_ptr(data,  data_length, DHCP6_OPT_SERVERID);
323}
324
325static int check_client_id(uint8_t *data, int data_length)
326{
327  if ((data = get_msg_ptr(data,  data_length, DHCP6_OPT_CLIENTID))) {
328    DUID one = *((DUID*)(data+4));
329    DUID two = *((DUID*)&mesg.options[4]);
330
331    if (!memcmp(&one, &two, sizeof(DUID))) return 1;
332  }
333  return 0;
334}
335
336static int validate_ids()
337{
338  if (!check_server_id(mymsg->dhcp6.options,
339    TT.status - ((char*)&mymsg->dhcp6.options[0] - (char*)mymsg) )) {
340    dbg("Invalid server id: %d\n");
341    return 0;
342  }
343  if (!check_client_id(mymsg->dhcp6.options,
344    TT.status - ((char*)&mymsg->dhcp6.options[0] - (char*)mymsg) )) {
345    dbg("Invalid client id: %d\n");
346    return 0;
347  }
348  return 1;
349}
350
351static void parse_ia_na(uint8_t *data, int data_length)
352{
353  uint8_t *t = get_msg_ptr(data, data_length, DHCP6_OPT_IA_NA);
354  uint16_t iana_len, content_len = 0;
355
356  memset(&dhcp_data,0,sizeof(dhcp_data));
357  if (!t) return;
358
359  iana_len = ntohs(*((uint16_t*)(t+2)));
360  dhcp_data.iaid = ntohl(*((uint32_t*)(t+4)));
361  dhcp_data.t1 = ntohl(*((uint32_t*)(t+8)));
362  dhcp_data.t2 = ntohl(*((uint32_t*)(t+12)));
363  t += 16;
364  iana_len -= 12;
365
366  while(iana_len > 0) {
367    uint16_t sub_type = ntohs(*((uint16_t*)(t)));
368
369    switch (sub_type) {
370      case DHCP6_OPT_IA_ADDR:
371        content_len = ntohs(*((uint16_t*)(t+2)));
372        memcpy(dhcp_data.ipaddr,t+4,16);
373        if (TT.state == DHCP6SOLICIT) {
374          if (TT.req_ip) {
375            struct addrinfo *res = NULL;
376
377            if(!getaddrinfo(TT.req_ip, NULL, NULL,&res)) {
378              dbg("Requesting IP: %s\n", TT.req_ip);
379              memcpy (&TT.input_socket6, res->ai_addr, res->ai_addrlen);
380              memcpy(t+4, TT.input_socket6.sin6_addr.s6_addr, 16);
381            } else xprintf("Invalid IP: %s\n",TT.req_ip);
382            freeaddrinfo(res);
383          }
384        }
385        dhcp_data.pf_lf = ntohl(*((uint32_t*)(t+20)));
386        dhcp_data.va_lf = ntohl(*((uint32_t*)(t+24)));
387        iana_len -= (content_len + 4);
388        t += (content_len + 4);
389        break;
390      case DHCP6_OPT_STATUS_CODE:
391        content_len = ntohs(*((uint16_t*)(t+2)));
392        dhcp_data.status_code = ntohs(*((uint16_t*)(t+4)));
393        iana_len -= (content_len + 4);
394        t += (content_len + 4);
395        break;
396      default:
397        content_len = ntohs(*((uint16_t*)(t+2)));
398        iana_len -= (content_len + 4);
399        t += (content_len + 4);
400        break;
401    }
402  }
403}
404
405static void write_pid(char *path)
406{
407  int pidfile = open(path, O_CREAT | O_WRONLY | O_TRUNC, 0666);
408
409  if (pidfile > 0) {
410    char pidbuf[12];
411
412    sprintf(pidbuf, "%u", (unsigned)getpid());
413    write(pidfile, pidbuf, strlen(pidbuf));
414    close(pidfile);
415  }
416}
417
418// Creates environment pointers from RES to use in script
419static int fill_envp(DHCP_DATA *res)
420{
421  int ret = setenv("interface", TT.interface_name, 1);
422
423  if (ret) return ret;
424  inet_ntop(AF_INET6, res->ipaddr, toybuf, INET6_ADDRSTRLEN);
425  ret = setenv("ip",(const char*)toybuf , 1);
426  return ret;
427}
428
429// Executes Script NAME.
430static void run_script(DHCP_DATA *res,  char *name)
431{
432  volatile int error = 0;
433  struct stat sts;
434  pid_t pid;
435  char *argv[3];
436  char *script = (toys.optflags & FLAG_s) ? TT.script
437    : "/usr/share/dhcp/default.script";
438
439  if (stat(script, &sts) == -1 && errno == ENOENT) return;
440  if (!res || fill_envp(res)) {
441    dbg("Failed to create environment variables.\n");
442    return;
443  }
444  dbg("Executing %s %s\n", script, name);
445  argv[0] = (char*)script;
446  argv[1] = (char*)name;
447  argv[2] = NULL;
448  fflush(NULL);
449
450  pid = vfork();
451  if (pid < 0) {
452    dbg("Fork failed.\n");
453    return;
454  }
455  if (!pid) {
456    execvp(argv[0], argv);
457    error = errno;
458    _exit(111);
459  }
460  if (error) {
461    waitpid(pid, NULL, 0);
462    errno = error;
463    perror_msg("script exec failed");
464  }
465  dbg("script complete.\n");
466}
467
468static void lease_fail()
469{
470  dbg("Lease failed.\n");
471  run_script(NULL, "leasefail");
472  if (toys.optflags & FLAG_n) {
473    xclose(TT.sock);
474    xclose(TT.sock1);
475    error_exit("Lease Failed, Exiting.");
476  }
477  if (toys.optflags & FLAG_b) {
478    dbg("Lease failed. Going to daemon mode.\n");
479    if (daemon(0,0)) perror_exit("daemonize");
480    if (toys.optflags & FLAG_p) write_pid(TT.pidfile);
481    toys.optflags &= ~FLAG_b;
482    toys.optflags |= FLAG_f;
483  }
484}
485
486// Generic signal handler real handling is done in main funcrion.
487static void signal_handler(int sig)
488{
489    dbg("Caught signal: %d\n", sig);
490    switch (sig) {
491    case SIGUSR1:
492      dbg("SIGUSR1.\n");
493      if (TT.state == DHCP6RELEASE || TT.state == DHCP6REQUEST ) {
494        TT.state = DHCP6SOLICIT;
495        set_timeout(0);
496        return;
497      }
498      dbg("SIGUSR1 sending renew.\n");
499      send_msg(DHCP6RENEW);
500      TT.state = DHCP6RENEW;
501      TT.retries = 0;
502      set_timeout(0);
503      break;
504    case SIGUSR2:
505      dbg("SIGUSR2.\n");
506      if (TT.state == DHCP6RELEASE) return;
507      if (TT.state != DHCP6CONFIRM ) return;
508      dbg("SIGUSR2 sending release.\n");
509      send_msg(DHCP6RELEASE);
510      TT.state = DHCP6RELEASE;
511      TT.retries = 0;
512      set_timeout(0);
513      break;
514    case SIGTERM:
515    case SIGINT:
516      dbg((sig == SIGTERM)?"SIGTERM.\n":"SIGINT.\n");
517      if ((toys.optflags & FLAG_R) && TT.state == DHCP6CONFIRM)
518        send_msg(DHCP6RELEASE);
519      if(sig == SIGINT) exit(0);
520      break;
521    default: break;
522  }
523}
524
525// signal setup for SIGUSR1 SIGUSR2 SIGTERM
526static int setup_signal()
527{
528  signal(SIGUSR1, signal_handler);
529  signal(SIGUSR2, signal_handler);
530  signal(SIGTERM, signal_handler);
531  signal(SIGINT, signal_handler);
532  return 0;
533}
534
535void dhcp6_main(void)
536{
537  struct sockaddr_in6  sinaddr6;
538  int constone = 1;
539  fd_set rfds;
540
541  srand(time(NULL));
542  setlinebuf(stdout);
543  dbg = dummy;
544  TT.state = DHCP6SOLICIT;
545
546  if (toys.optflags & FLAG_v) dbg = logit;
547  if (!TT.interface_name) TT.interface_name = "eth0";
548  if (toys.optflags & FLAG_p) write_pid(TT.pidfile);
549  if (!TT.retry) TT.retry = 3;
550  if (!TT.timeout) TT.timeout = 3;
551  if (!TT.errortimeout) TT.errortimeout = 20;
552  if (toys.optflags & FLAG_S) {
553    openlog("DHCP6 :", LOG_PID, LOG_DAEMON);
554    dbg = logit;
555  }
556
557  dbg("Interface: %s\n", TT.interface_name);
558  dbg("pid file: %s\n", TT.pidfile);
559  dbg("Retry count: %d\n", TT.retry);
560  dbg("Timeout : %d\n", TT.timeout);
561  dbg("Error timeout: %d\n", TT.errortimeout);
562
563
564
565  setup_signal();
566  TT.sock1 = xsocket(PF_INET6, SOCK_DGRAM, 0);
567  memset(&sinaddr6, 0, sizeof(sinaddr6));
568  sinaddr6.sin6_family = AF_INET6;
569  sinaddr6.sin6_port = htons(DHCPC_CLIENT_PORT);
570  sinaddr6.sin6_scope_id = if_nametoindex(TT.interface_name);
571  sinaddr6.sin6_addr = in6addr_any ;
572
573  xsetsockopt(TT.sock1, SOL_SOCKET, SO_REUSEADDR, &constone, sizeof(constone));
574
575  xbind(TT.sock1, (struct sockaddr *)&sinaddr6, sizeof(sinaddr6));
576
577  mode_raw();
578  set_timeout(0);
579  for (;;) {
580    int maxfd = TT.sock;
581
582    if (TT.sock >= 0) FD_SET(TT.sock, &rfds);
583    TT.retval = 0;
584    if ((TT.retval = select(maxfd + 1, &rfds, NULL, NULL, &TT.tv)) < 0) {
585      if(errno == EINTR) continue;
586      perror_exit("Error in select");
587    }
588    if (!TT.retval) {
589      if (TT.state == DHCP6SOLICIT || TT.state == DHCP6CONFIRM) {
590        dbg("State is solicit, sending solicit packet\n");
591        run_script(NULL, "deconfig");
592        send_msg(DHCP6SOLICIT);
593        TT.state = DHCP6SOLICIT;
594        TT.retries++;
595        if(TT.retries > TT.retry) set_timeout(TT.errortimeout);
596        else if (TT.retries == TT.retry) {
597          dbg("State is solicit, retry count is max.\n");
598          lease_fail();
599          set_timeout(TT.errortimeout);
600        } else set_timeout(TT.timeout);
601        continue;
602      } else if (TT.state == DHCP6REQUEST || TT.state == DHCP6RENEW ||
603              TT.state == DHCP6RELEASE) {
604        dbg("State is %d , sending packet\n", TT.state);
605        send_msg(TT.state);
606        TT.retries++;
607        if (TT.retries > TT.retry) set_timeout(TT.errortimeout);
608        else if (TT.retries == TT.retry) {
609          lease_fail();
610          set_timeout(TT.errortimeout);
611        } else set_timeout(TT.timeout);
612        continue;
613      }
614    } else if (FD_ISSET(TT.sock, &rfds)) {
615      if ((TT.status = read(TT.sock, toybuf, sizeof(toybuf))) <= 0) continue;
616      mymsg = (dhcp6_raw_t*)toybuf;
617      if (ntohs(mymsg->udph.dest) == 546 &&
618              !memcmp(mymsg->dhcp6.transaction_id, TT.transction_id, 3)) {
619        if (TT.state == DHCP6SOLICIT) {
620          if (mymsg->dhcp6.msgtype == DHCP6ADVERTISE ) {
621            if (!validate_ids()) {
622              dbg("Invalid id received, solicit.\n");
623              TT.state = DHCP6SOLICIT;
624              continue;
625            }
626            dbg("Got reply to request or solicit.\n");
627            TT.retries = 0;
628            set_timeout(0);
629            TT.request_length = TT.status - ((char*)&mymsg->dhcp6 - (char*)mymsg);
630            memcpy((uint8_t*)&mesg, &mymsg->dhcp6, TT.request_length);
631            parse_ia_na(mesg.options, TT.request_length);
632            dbg("Status code:%d\n", dhcp_data.status_code);
633            inet_ntop(AF_INET6, dhcp_data.ipaddr, toybuf, INET6_ADDRSTRLEN);
634            dbg("Advertiesed IP: %s\n", toybuf);
635            TT.state = DHCP6REQUEST;
636          } else {
637            dbg("Invalid solicit.\n");
638            continue;
639          }
640        } else if (TT.state == DHCP6REQUEST || TT.state == DHCP6RENEW ) {
641          if (mymsg->dhcp6.msgtype == DHCP6REPLY) {
642            if (!validate_ids()) {
643              dbg("Invalid id received, %d.\n", TT.state);
644              TT.state = DHCP6REQUEST;
645              continue;
646            }
647            dbg("Got reply to request or renew.\n");
648            TT.request_length = TT.status - ((char*)&mymsg->dhcp6 - (char*)mymsg);
649            memcpy((uint8_t*)&mesg, &mymsg->dhcp6, TT.request_length);
650            parse_ia_na(mymsg->dhcp6.options, TT.request_length);
651            dbg("Status code:%d\n", dhcp_data.status_code);
652            inet_ntop(AF_INET6, dhcp_data.ipaddr, toybuf, INET6_ADDRSTRLEN);
653            dbg("Got IP: %s\n", toybuf);
654            TT.retries = 0;
655            run_script(&dhcp_data, (TT.state == DHCP6REQUEST) ?
656              "request" : "renew");
657            if (toys.optflags & FLAG_q) {
658              if (toys.optflags & FLAG_R) send_msg(DHCP6RELEASE);
659              break;
660            }
661            TT.state = DHCP6CONFIRM;
662            set_timeout((dhcp_data.va_lf)?dhcp_data.va_lf:INT_MAX);
663            dbg("Setting timeout to intmax.");
664            if (TT.state == DHCP6REQUEST || !(toys.optflags & FLAG_f)) {
665              dbg("Making it a daemon\n");
666              if (daemon(0,0)) perror_exit("daemonize");
667              toys.optflags |= FLAG_f;
668              if (toys.optflags & FLAG_p) write_pid(TT.pidfile);
669            }
670            dbg("Making it a foreground.\n");
671            continue;
672          } else {
673            dbg("Invalid reply.\n");
674            continue;
675          }
676        } else if (TT.state == DHCP6RELEASE) {
677          dbg("Got reply to release.\n");
678          run_script(NULL, "release");
679          set_timeout(INT_MAX);
680        }
681      }
682    }
683  }
684  xclose(TT.sock1);
685  xclose(TT.sock);
686}
687