a77198417d6208c2d49f8c35247b683bd95ee171
[dhcpcd-ui] / src / libdhcpcd / dhcpcd.c
1 /*
2  * libdhcpcd
3  * Copyright 2009-2014 Roy Marples <roy@marples.name>
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26
27 // For strverscmp(3)
28 #define _GNU_SOURCE
29
30 #include <sys/socket.h>
31 #include <sys/stat.h>
32 #include <sys/un.h>
33
34 #include <arpa/inet.h>
35
36 #include <assert.h>
37 #include <ctype.h>
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <libintl.h>
41 #include <limits.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46
47 #define IN_LIBDHCPCD
48
49 #include "config.h"
50 #include "dhcpcd.h"
51
52 #ifdef HAS_GETTEXT
53 #include <libintl.h>
54 #define _ gettext
55 #else
56 #define _(a) (a)
57 #endif
58
59 #ifdef HAVE_VIS_H
60 #include <vis.h>
61 #endif
62
63 #ifndef SUN_LEN
64 #define SUN_LEN(su) \
65         (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
66 #endif
67
68 #ifndef iswhite
69 #define iswhite(c)      (c == ' ' || c == '\t' || c == '\n')
70 #endif
71
72 static const char * const dhcpcd_types[] =
73     { "link", "ipv4", "ra", "dhcp6", NULL };
74
75 static ssize_t
76 dhcpcd_command_fd(DHCPCD_CONNECTION *con,
77     int fd, bool progname, const char *cmd, char **buffer)
78 {
79         size_t pl, cl, len;
80         ssize_t bytes;
81         char buf[1024], *p;
82         char *nbuf;
83
84         assert(con);
85         assert(cmd);
86
87         /* Each command is \n terminated.
88          * Each argument is NULL seperated.
89          * We may need to send a space one day, so the API
90          * in this function may need to be improved */
91         cl = strlen(cmd);
92         if (progname) {
93                 pl = strlen(con->progname);
94                 len = pl + 1 + cl + 1;
95         } else {
96                 pl = 0;
97                 len = cl + 1;
98         }
99         if (con->terminate_commands)
100                 len++;
101         if (len > sizeof(buf)) {
102                 errno = ENOBUFS;
103                 return -1;
104         }
105         p = buf;
106         if (progname) {
107                 memcpy(buf, con->progname, pl);
108                 buf[pl] = '\0';
109                 p = buf + pl + 1;
110         }
111         memcpy(p, cmd, cl);
112         p[cl] = '\0';
113         while ((p = strchr(p, ' ')) != NULL)
114                 *p++ = '\0';
115         if (con->terminate_commands) {
116                 buf[len - 2] = '\n';
117                 buf[len - 1] = '\0';
118         } else
119                 buf[len - 1] = '\0';
120         if (write(fd, buf, len) == -1)
121                 return -1;
122         if (buffer == NULL)
123                 return 0;
124
125         bytes = read(fd, buf, sizeof(size_t));
126         if (bytes == 0 || bytes == -1)
127                 return bytes;
128         memcpy(&len, buf, sizeof(size_t));
129         nbuf = realloc(*buffer, len + 1);
130         if (nbuf == NULL)
131                 return -1;
132         *buffer = nbuf;
133         bytes = read(fd, *buffer, len);
134         if (bytes != -1 && (size_t)bytes < len)
135                 *buffer[bytes] = '\0';
136         return bytes;
137 }
138
139 ssize_t
140 dhcpcd_command(DHCPCD_CONNECTION *con, const char *cmd, char **buffer)
141 {
142
143         assert(con);
144         if (!con->privileged) {
145                 errno = EACCES;
146                 return -1;
147         }
148         return dhcpcd_command_fd(con, con->command_fd, true, cmd, buffer);
149 }
150
151 static ssize_t
152 dhcpcd_ctrl_command(DHCPCD_CONNECTION *con, const char *cmd, char **buffer)
153 {
154
155         return dhcpcd_command_fd(con, con->command_fd, false, cmd, buffer);
156 }
157
158 bool
159 dhcpcd_realloc(DHCPCD_CONNECTION *con, size_t len)
160 {
161
162         assert(con);
163         if (con->buflen < len) {
164                 char *nbuf;
165
166                 nbuf = realloc(con->buf, len);
167                 if (nbuf == NULL)
168                         return false;
169                 con->buf = nbuf;
170                 con->buflen = len;
171         }
172         return true;
173 }
174
175 ssize_t
176 dhcpcd_command_arg(DHCPCD_CONNECTION *con, const char *cmd, const char *arg,
177     char **buffer)
178 {
179         size_t cmdlen, len;
180
181         assert(con);
182         assert(cmd);
183
184         cmdlen = strlen(cmd);
185         if (arg)
186                 len = cmdlen + strlen(arg) + 2;
187         else
188                 len = cmdlen + 1;
189         if (!dhcpcd_realloc(con, len))
190                 return -1;
191         strlcpy(con->buf, cmd, con->buflen);
192         if (arg) {
193                 con->buf[cmdlen] = ' ';
194                 strlcpy(con->buf + cmdlen + 1, arg, con->buflen - 1 - cmdlen);
195         }
196
197         return dhcpcd_command_fd(con, con->command_fd, true, con->buf, buffer);
198 }
199
200
201 static int
202 dhcpcd_connect(const char *path, int opts)
203 {
204         int fd;
205         socklen_t len;
206         struct sockaddr_un sun;
207
208         assert(path);
209         fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | opts, 0);
210         if (fd == -1)
211                 return -1;
212
213         memset(&sun, 0, sizeof(sun));
214         sun.sun_family = AF_UNIX;
215         strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
216         len = (socklen_t)SUN_LEN(&sun);
217         if (connect(fd, (struct sockaddr *)&sun, len) == 0)
218                 return fd;
219         close(fd);
220         return -1;
221 }
222
223 static const char *
224 get_value(const char *data, size_t len, const char *var)
225 {
226         const char *end, *p;
227         size_t vlen;
228
229         assert(var);
230         end = data + len;
231         vlen = strlen(var);
232         p = NULL;
233         while (data + vlen + 1 < end) {
234                 /* Skip past NUL padding */
235                 if (*data == '\0') {
236                         data++;
237                         continue;
238                 }
239                 if (strncmp(data, var, vlen) == 0 && data[vlen] == '=') {
240                         p = data + vlen + 1;
241                         break;
242                 }
243                 data += strlen(data) + 1;
244         }
245         if (p != NULL && *p != '\0')
246                 return p;
247         return NULL;
248 }
249
250 const char *
251 dhcpcd_get_value(const DHCPCD_IF *i, const char *var)
252 {
253
254         assert(i);
255         assert(var);
256         return get_value(i->data, i->data_len, var);
257 }
258
259 ssize_t
260 dhcpcd_encode_string_escape(char *dst, size_t len, const char *src, size_t slen)
261 {
262         const char *end;
263         size_t bytes;
264         int c;
265
266         end = src + slen;
267         bytes = 0;
268         while (src < end) {
269                 c = *src++;
270                 if ((c == '\\' || !isascii(c) || !isprint(c))) {
271                         if (c == '\\') {
272                                 if (dst) {
273                                         if (len  == 0 || len == 1) {
274                                                 errno = ENOSPC;
275                                                 return -1;
276                                         }
277                                         *dst++ = '\\'; *dst++ = '\\';
278                                         len -= 2;
279                                 }
280                                 bytes += 2;
281                                 continue;
282                         }
283                         if (dst) {
284                                 if (len < 5) {
285                                         errno = ENOSPC;
286                                         return -1;
287                                 }
288                                 *dst++ = '\\';
289                                 *dst++ = (((unsigned char)c >> 6) & 03) + '0';
290                                 *dst++ = (((unsigned char)c >> 3) & 07) + '0';
291                                 *dst++ = ( (unsigned char)c       & 07) + '0';
292                                 len -= 4;
293                         }
294                         bytes += 4;
295                 } else {
296                         if (dst) {
297                                 if (len == 0) {
298                                         errno = ENOSPC;
299                                         return -1;
300                                 }
301                                 *dst++ = (char)c;
302                                 len--;
303                         }
304                         bytes++;
305                 }
306         }
307
308         if (dst) {
309                 if (len == 0) {
310                         errno = ENOSPC;
311                         return -1;
312                 }
313                 *dst = '\0';
314         }
315
316         return (ssize_t)bytes;
317 }
318
319 ssize_t
320 dhcpcd_decode_string_escape(char *dst, size_t dlen, const char *src)
321 {
322         char c, esc;
323         int oct;
324         ssize_t bytes;
325
326         bytes = 0;
327         for (;;) {
328                 c = *src++;
329                 if (c == '\0')
330                         break;
331                 if (dst && --dlen == 0) {
332                         errno = ENOSPC;
333                         return -1;
334                 }
335                 switch (c) {
336                 case '\\':
337                         if (*src == '\0') {
338                                 errno = EINVAL;
339                                 return -1;
340                         }
341                         esc = *src++;
342                         switch (esc) {
343                         case '\\':
344                         case '0':
345                         case '1':
346                         case '3':
347                         case '4':
348                         case '5':
349                         case '6':
350                         case '7':
351                                 oct = esc - '0';
352                                 if (*src >= '0' && *src <='7')
353                                         oct = oct * 8 + (*src++ - '0');
354                                 else {
355                                         errno = EINVAL;
356                                         return -1;
357                                 }
358                                 if (*src >= '0' && *src <='7')
359                                         oct = oct * 8 + (*src++ - '0');
360                                 else {
361                                         errno = EINVAL;
362                                         return -1;
363                                 }
364                                 if (dst)
365                                         *dst++ = (char)oct;
366                         default:
367                                 errno = EINVAL;
368                                 return -1;
369                         }
370                         break;
371                 default:
372                         if (dst)
373                                 *dst++ = c;
374                 }
375                 bytes++;
376         }
377         if (dst && --dlen == 0) {
378                 errno = ENOSPC;
379                 return -1;
380         }
381         *dst = '\0';
382         return bytes;
383 }
384
385 ssize_t
386 dhcpcd_decode_hex(char *dst, size_t dlen, const char *src)
387 {
388         size_t bytes, i;
389         char c;
390         int val, n;
391
392         bytes = 0;
393         while (*src) {
394                 if (dlen == 0 || dlen == 1) {
395                         errno = ENOSPC;
396                         return -1;
397                 }
398                 val = 0;
399                 for (i = 0; i < 2; i++) {
400                         c = *src++;
401                         if (c >= '0' && c <= '9')
402                                 n = c - '0';
403                         else if (c >= 'a' && c <= 'f')
404                                 n = 10 + c - 'a';
405                         else if (c >= 'A' && c <= 'F')
406                                 n = 10 + c - 'A';
407                         else {
408                                 errno = EINVAL;
409                                 return -1;
410                         }
411                         val = val * 16 + n;
412                 }
413                 *dst++ = (char)val;
414                 bytes += 2;
415                 dlen -= 2;
416                 if (*src == ':')
417                         src++;
418         }
419         return (ssize_t)bytes;
420 }
421
422 const char *
423 dhcpcd_get_prefix_value(const DHCPCD_IF *i, const char *prefix, const char *var)
424 {
425         char pvar[128], *p;
426         size_t plen, l;
427
428         assert(i);
429         assert(prefix);
430         assert(var);
431
432         p = pvar;
433         plen = sizeof(pvar);
434         l = strlcpy(p, prefix, plen);
435         if (l >= sizeof(pvar)) {
436                 errno = ENOBUFS;
437                 return NULL;
438         }
439         p += l;
440         plen -= l;
441         if (strlcpy(p, var, plen) >= plen) {
442                 errno = ENOBUFS;
443                 return NULL;
444         }
445         return dhcpcd_get_value(i, pvar);
446 }
447
448 static bool
449 strtobool(const char *var)
450 {
451
452         if (var == NULL)
453                 return false;
454
455          return (*var == '0' || *var == '\0' ||
456             strcmp(var, "false") == 0 ||
457             strcmp(var, "no") == 0) ? false : true;
458 }
459
460 static const char *
461 get_status(DHCPCD_CONNECTION *con)
462 {
463         DHCPCD_IF *i;
464         const char *status;
465
466         assert(con);
467         if (con->command_fd == -1)
468                 return "down";
469
470         if (con->listen_fd == -1)
471                 return "opened";
472
473         if (con->interfaces == NULL)
474                 return "initialised";
475
476         status = "disconnected";
477         for (i = con->interfaces; i; i = i->next) {
478                 if (i->up) {
479                         if (strcmp(i->type, "link")) {
480                                 status = "connected";
481                                 break;
482                         } else
483                                 status = "connecting";
484                 }
485         }
486         return status;
487 }
488
489 static void
490 update_status(DHCPCD_CONNECTION *con, const char *nstatus)
491 {
492
493         assert(con);
494         if (nstatus == NULL)
495                 nstatus = get_status(con);
496         if (con->status == NULL || strcmp(nstatus, con->status)) {
497                 con->status = nstatus;
498                 if (con->status_cb)
499                         con->status_cb(con, con->status, con->status_context);
500         }
501 }
502
503 DHCPCD_IF *
504 dhcpcd_interfaces(DHCPCD_CONNECTION *con)
505 {
506
507         assert(con);
508         return con->interfaces;
509 }
510
511 DHCPCD_IF *
512 dhcpcd_get_if(DHCPCD_CONNECTION *con, const char *ifname, const char *type)
513 {
514         DHCPCD_IF *i;
515
516         assert(con);
517         assert(ifname);
518         assert(type);
519
520         for (i = con->interfaces; i; i = i->next)
521                 if (strcmp(i->ifname, ifname) == 0 &&
522                     strcmp(i->type, type) == 0)
523                         return i;
524         return NULL;
525 }
526
527 static DHCPCD_IF *
528 dhcpcd_new_if(DHCPCD_CONNECTION *con, char *data, size_t len)
529 {
530         const char *ifname, *ifclass, *reason, *type, *order, *flags;
531         char *orderdup, *o, *p;
532         DHCPCD_IF *e, *i, *l, *n, *nl;
533         int ti;
534         bool addedi;
535
536 #if 0
537         char *dp = data, *de = data + len;
538         while (dp < de) {
539                 printf ("XX: %s\n", dp);
540                 dp += strlen(dp) + 1;
541         }
542 #endif
543
544         ifname = get_value(data, len, "interface");
545         if (ifname == NULL || *ifname == '\0') {
546                 errno = ESRCH;
547                 return NULL;
548         }
549         reason = get_value(data, len, "reason");
550         if (reason == NULL || *reason == '\0') {
551                 errno = ESRCH;
552                 return NULL;
553         }
554         ifclass = get_value(data, len, "ifclass");
555         /* Skip pseudo interfaces */
556         if (ifclass && *ifclass != '\0') {
557                 errno = ENOTSUP;
558                 return NULL;
559         }
560         if (strcmp(reason, "RECONFIGURE") == 0 ||
561             strcmp(reason, "INFORM") == 0 || strcmp(reason, "INFORM6") == 0)
562         {
563                 errno = ENOTSUP;
564                 return NULL;
565         }
566         order = get_value(data, len, "interface_order");
567         if (order == NULL || *order == '\0') {
568                 errno = ESRCH;
569                 return NULL;
570         }
571
572         if (strcmp(reason, "PREINIT") == 0 ||
573             strcmp(reason, "UNKNOWN") == 0 ||
574             strcmp(reason, "CARRIER") == 0 ||
575             strcmp(reason, "NOCARRIER") == 0 ||
576             strcmp(reason, "DEPARTED") == 0 ||
577             strcmp(reason, "STOPPED") == 0)
578                 type = "link";
579         else if (strcmp(reason, "ROUTERADVERT") == 0)
580                 type = "ra";
581         else if (reason[strlen(reason) - 1] == '6')
582                 type = "dhcp6";
583         else
584                 type = "ipv4";
585
586         i = NULL;
587        /* Remove all instances on carrier drop */
588         if (strcmp(reason, "NOCARRIER") == 0 ||
589             strcmp(reason, "DEPARTED") == 0 ||
590             strcmp(reason, "STOPPED") == 0)
591         {
592                 l = NULL;
593                 for (e = con->interfaces; e; e = n) {
594                         n = e->next;
595                         if (strcmp(e->ifname, ifname) == 0) {
596                                 if (strcmp(e->type, type) == 0)
597                                         l = i = e;
598                                 else {
599                                         if (l)
600                                                 l->next = e->next;
601                                         else
602                                                 con->interfaces = e->next;
603                                         free(e);
604                                 }
605                         } else
606                                 l = e;
607                 }
608         } else if (strcmp(type, "link")) {
609                 /* If link is down, ignore it */
610                 e = dhcpcd_get_if(con, ifname, "link");
611                 if (e && !e->up)
612                         return NULL;
613         }
614
615         orderdup = strdup(order);
616         if (orderdup == NULL)
617                 return NULL;
618
619         /* Find our pointer */
620         if (i == NULL) {
621                 l = NULL;
622                 for (e = con->interfaces; e; e = e->next) {
623                         if (strcmp(e->ifname, ifname) == 0 &&
624                             strcmp(e->type, type) == 0)
625                         {
626                                 i = e;
627                                 break;
628                         }
629                         l = e;
630                 }
631         }
632         if (i == NULL) {
633                 i = malloc(sizeof(*i));
634                 if (i == NULL) {
635                         free(orderdup);
636                         return NULL;
637                 }
638                 if (l)
639                         l->next = i;
640                 else
641                         con->interfaces = i;
642                 i->next = NULL;
643                 i->last_message = NULL;
644         } else
645                 free(i->data);
646
647         /* Now fill out our interface structure */
648         i->con = con;
649         i->data = data;
650         i->data_len = len;
651         i->ifname = ifname;
652         i->type = type;
653         i->reason = reason;
654         flags = dhcpcd_get_value(i, "ifflags");
655         if (flags)
656                 i->flags = (unsigned int)strtoul(flags, NULL, 0);
657         else
658                 i->flags = 0;
659         if (strcmp(reason, "CARRIER") == 0 ||
660             strcmp(reason, "DELEGATED6") == 0)
661                 i->up = true;
662         else
663                 i->up = strtobool(dhcpcd_get_value(i, "if_up"));
664         i->wireless = strtobool(dhcpcd_get_value(i, "ifwireless"));
665         i->ssid = dhcpcd_get_value(i, "ifssid");
666         if (i->ssid == NULL && i->wireless)
667                 i->ssid = dhcpcd_get_value(i, i->up ? "new_ssid" : "old_ssid");
668
669        /* Sort! */
670         n = nl = NULL;
671         p = orderdup;
672         addedi = false;
673         while ((o = strsep(&p, " ")) != NULL) {
674                 for (ti = 0; dhcpcd_types[ti]; ti++) {
675                         l = NULL;
676                         for (e = con->interfaces; e; e = e->next) {
677                                 if (strcmp(e->ifname, o) == 0 &&
678                                     strcmp(e->type, dhcpcd_types[ti]) == 0)
679                                         break;
680                                 l = e;
681                         }
682                         if (e == NULL)
683                                 continue;
684                         if (i == e)
685                                 addedi = true;
686                         if (l)
687                                 l->next = e->next;
688                         else
689                                 con->interfaces = e->next;
690                         e->next = NULL;
691                         if (nl == NULL)
692                                 n = nl = e;
693                         else {
694                                 nl->next = e;
695                                 nl = e;
696                         }
697                 }
698         }
699         free(orderdup);
700         /* Free any stragglers */
701         while (con->interfaces) {
702                 e = con->interfaces->next;
703                 free(con->interfaces->data);
704                 free(con->interfaces->last_message);
705                 free(con->interfaces);
706                 con->interfaces = e;
707         }
708         con->interfaces = n;
709
710         return addedi ? i : NULL;
711 }
712
713 static DHCPCD_IF *
714 dhcpcd_read_if(DHCPCD_CONNECTION *con, int fd)
715 {
716         char sbuf[sizeof(size_t)], *rbuf;
717         size_t len;
718         ssize_t bytes;
719         DHCPCD_IF *i;
720
721         bytes = read(fd, sbuf, sizeof(sbuf));
722         if (bytes == 0 || bytes == -1) {
723                 dhcpcd_close(con);
724                 return NULL;
725         }
726         memcpy(&len, sbuf, sizeof(len));
727         rbuf = malloc(len + 1);
728         if (rbuf == NULL)
729                 return NULL;
730         bytes = read(fd, rbuf, len);
731         if (bytes == 0 || bytes == -1) {
732                 free(rbuf);
733                 dhcpcd_close(con);
734                 return NULL;
735         }
736         if ((size_t)bytes != len) {
737                 free(rbuf);
738                 errno = EINVAL;
739                 return NULL;
740         }
741         rbuf[bytes] = '\0';
742
743         i = dhcpcd_new_if(con, rbuf, len);
744         if (i == NULL)
745                 free(rbuf);
746         return i;
747 }
748
749 static void
750 dhcpcd_dispatchif(DHCPCD_IF *i)
751 {
752
753         assert(i);
754         if (i->con->if_cb)
755                 i->con->if_cb(i, i->con->if_context);
756         dhcpcd_wpa_if_event(i);
757 }
758
759 void
760 dhcpcd_dispatch(DHCPCD_CONNECTION *con)
761 {
762         DHCPCD_IF *i;
763
764         assert(con);
765         i = dhcpcd_read_if(con, con->listen_fd);
766         if (i)
767                 dhcpcd_dispatchif(i);
768
769         /* Have to call update_status last as it could
770          * cause the interface to be destroyed. */
771         update_status(con, NULL);
772 }
773
774 DHCPCD_CONNECTION *
775 dhcpcd_new(void)
776 {
777         DHCPCD_CONNECTION *con;
778
779         con = calloc(1, sizeof(*con));
780         con->command_fd = con->listen_fd = -1;
781         con->open = false;
782         con->progname = "libdhcpcd";
783         return con;
784 }
785
786 void
787 dhcpcd_set_progname(DHCPCD_CONNECTION *con, const char *progname)
788 {
789
790         assert(con);
791         con->progname = progname;
792 }
793
794 const char *
795 dhcpcd_get_progname(const DHCPCD_CONNECTION *con)
796 {
797
798         assert(con);
799         return con->progname;
800 }
801
802 #ifndef HAVE_STRVERSCMP
803 /* Good enough for our needs */
804 static int
805 strverscmp(const char *s1, const char *s2)
806 {
807         int s1maj, s1min, s1part;
808         int s2maj, s2min, s2part;
809         int r;
810
811         s1min = s1part = 0;
812         if (sscanf(s1, "%d.%d.%d", &s1maj, &s1min, &s1part) < 1)
813                 return -1;
814         s2min = s2part = 0;
815         if (sscanf(s2, "%d.%d.%d", &s2maj, &s2min, &s2part) < 1)
816                 return -1;
817         r = s1maj - s2maj;
818         if (r != 0)
819                 return r;
820         r = s1min - s2min;
821         if (r != 0)
822                 return r;
823         return s1part - s2part;
824 }
825 #endif
826
827 int
828 dhcpcd_open(DHCPCD_CONNECTION *con, bool privileged)
829 {
830         const char *path = privileged ? DHCPCD_SOCKET : DHCPCD_UNPRIV_SOCKET;
831         char cmd[128];
832         ssize_t bytes;
833         size_t nifs, n;
834
835         assert(con);
836         if (con->open) {
837                 if (con->listen_fd != -1)
838                         return con->listen_fd;
839                 errno = EISCONN;
840                 return -1;
841         }
842         /* We need to block the command fd */
843         con->command_fd = dhcpcd_connect(path, 0);
844         if (con->command_fd == -1)
845                 goto err_exit;
846
847         con->terminate_commands = false;
848         if (dhcpcd_ctrl_command(con, "--version", &con->version) <= 0)
849                 goto err_exit;
850         con->terminate_commands =
851             strverscmp(con->version, "6.4.1") >= 0 ? true : false;
852
853         if (dhcpcd_ctrl_command(con, "--getconfigfile", &con->cffile) <= 0)
854                 goto err_exit;
855
856         con->open = true;
857         con->privileged = privileged;
858         update_status(con, NULL);
859
860         con->listen_fd = dhcpcd_connect(path, SOCK_NONBLOCK);
861         if (con->listen_fd == -1)
862                 goto err_exit;
863
864         dhcpcd_command_fd(con, con->listen_fd, false, "--listen", NULL);
865         dhcpcd_command_fd(con, con->command_fd, false, "--getinterfaces", NULL);
866         bytes = read(con->command_fd, cmd, sizeof(nifs));
867         if (bytes != sizeof(nifs))
868                 goto err_exit;
869         memcpy(&nifs, cmd, sizeof(nifs));
870         /* We don't dispatch each interface here as that
871          * causes too much notification spam when the GUI starts */
872         for (n = 0; n < nifs; n++)
873                 dhcpcd_read_if(con, con->command_fd);
874
875         update_status(con, NULL);
876
877         return con->listen_fd;
878
879 err_exit:
880         dhcpcd_close(con);
881         return -1;
882 }
883
884 int
885 dhcpcd_get_fd(DHCPCD_CONNECTION *con)
886 {
887
888         assert(con);
889         return con->listen_fd;
890 }
891
892 bool
893 dhcpcd_privileged(DHCPCD_CONNECTION *con)
894 {
895
896         assert(con);
897         return con->privileged;
898 }
899
900 const char *
901 dhcpcd_status(DHCPCD_CONNECTION *con)
902 {
903
904         assert(con);
905         return con->status;
906 }
907
908 const char *
909 dhcpcd_version(DHCPCD_CONNECTION *con)
910 {
911
912         assert(con);
913         return con->version;
914 }
915
916 const char *
917 dhcpcd_cffile(DHCPCD_CONNECTION *con)
918 {
919
920         assert(con);
921         return con->cffile;
922 }
923
924 void
925 dhcpcd_set_if_callback(DHCPCD_CONNECTION *con,
926     void (*cb)(DHCPCD_IF *, void *), void *ctx)
927 {
928
929         assert(con);
930         con->if_cb = cb;
931         con->if_context = ctx;
932 }
933
934 void
935 dhcpcd_set_status_callback(DHCPCD_CONNECTION *con,
936     void (*cb)(DHCPCD_CONNECTION *, const char *, void *), void *ctx)
937 {
938
939         assert(con);
940         con->status_cb = cb;
941         con->status_context = ctx;
942 }
943
944 void
945 dhcpcd_close(DHCPCD_CONNECTION *con)
946 {
947         DHCPCD_IF *nif;
948         DHCPCD_WPA *nwpa;
949         DHCPCD_WI_HIST *nh;
950
951         assert(con);
952
953         con->open = false;
954
955         /* Shut down WPA listeners as they aren't much good without dhcpcd.
956          * They'll be restarted anyway when dhcpcd comes back up. */
957         while (con->wpa) {
958                 nwpa = con->wpa->next;
959                 dhcpcd_wpa_close(con->wpa);
960                 free(con->wpa);
961                 con->wpa = nwpa;
962         }
963         while (con->wi_history) {
964                 nh = con->wi_history->next;
965                 free(con->wi_history);
966                 con->wi_history = nh;
967         }
968         while (con->interfaces) {
969                 nif = con->interfaces->next;
970                 free(con->interfaces->data);
971                 free(con->interfaces->last_message);
972                 free(con->interfaces);
973                 con->interfaces = nif;
974         }
975
976         if (con->command_fd != -1)
977                 shutdown(con->command_fd, SHUT_RDWR);
978         if (con->listen_fd != -1)
979                 shutdown(con->listen_fd, SHUT_RDWR);
980
981         update_status(con, "down");
982
983         if (con->command_fd != -1) {
984                 close(con->command_fd);
985                 con->command_fd = -1;
986         }
987         if (con->listen_fd != -1) {
988                 close(con->listen_fd);
989                 con->listen_fd = -1;
990         }
991
992         if (con->cffile) {
993                 free(con->cffile);
994                 con->cffile = NULL;
995         }
996         if (con->version) {
997                 free(con->version);
998                 con->version = NULL;
999         }
1000         if (con->buf) {
1001                 free(con->buf);
1002                 con->buf = NULL;
1003                 con->buflen = 0;
1004         }
1005 }
1006
1007 void
1008 dhcpcd_free(DHCPCD_CONNECTION *con)
1009 {
1010
1011         assert(con);
1012         free(con);
1013 }
1014
1015 DHCPCD_CONNECTION *
1016 dhcpcd_if_connection(DHCPCD_IF *i)
1017 {
1018
1019         assert(i);
1020         return i->con;
1021 }
1022
1023 char *
1024 dhcpcd_if_message(DHCPCD_IF *i, bool *new_msg)
1025 {
1026         const char *ip, *iplen, *pfx;
1027         char *msg, *p;
1028         const char *reason = NULL;
1029         size_t len;
1030         bool showssid;
1031
1032         assert(i);
1033         /* Don't report non SLAAC configurations */
1034         if (strcmp(i->type, "ra") == 0 && i->up &&
1035             dhcpcd_get_value(i, "ra1_prefix") == NULL)
1036                 return NULL;
1037
1038         showssid = false;
1039         if (strcmp(i->reason, "EXPIRE") == 0)
1040                 reason = _("Expired");
1041         else if (strcmp(i->reason, "CARRIER") == 0) {
1042                 if (i->wireless) {
1043                         showssid = true;
1044                         reason = _("Associated with");
1045                 } else {
1046                         /* Don't report able in if we have addresses */
1047                         const DHCPCD_IF *ci;
1048
1049                         for (ci = i->con->interfaces; ci; ci = ci->next) {
1050                                 if (ci != i &&
1051                                     strcmp(i->ifname, ci->ifname) == 0 &&
1052                                     ci->up)
1053                                         break;
1054                         }
1055                         if (ci)
1056                                 return NULL;
1057                         reason = _("Link is up, configuring");
1058                 }
1059         } else if (strcmp(i->reason, "NOCARRIER") == 0) {
1060                 if (i->wireless) {
1061                         if (i->ssid) {
1062                                 reason = _("Disassociated from");
1063                                 showssid = true;
1064                         } else
1065                                 reason = _("Not associated");
1066                 } else
1067                         reason = _("Link is down");
1068         } else if (strcmp(i->reason, "DEPARTED") == 0)
1069                 reason = _("Departed");
1070         else if (strcmp(i->reason, "UNKNOWN") == 0)
1071                 reason = _("Unknown link state");
1072         else if (strcmp(i->reason, "FAIL") == 0)
1073                 reason = _("Automatic configuration not possible");
1074         else if (strcmp(i->reason, "3RDPARTY") == 0)
1075                 reason = _("Waiting for 3rd Party configuration");
1076
1077         if (reason == NULL) {
1078                 if (i->up) {
1079                         if (strcmp(i->reason, "DELEGATED6") == 0)
1080                                 reason = _("Delegated");
1081                         else
1082                                 reason = _("Configured");
1083                 } else if (strcmp(i->type, "ra") == 0)
1084                         reason = "Expired RA";
1085                 else
1086                         reason = i->reason;
1087         }
1088
1089         pfx = i->up ? "new_" : "old_";
1090         if ((ip = dhcpcd_get_prefix_value(i, pfx, "ip_address")))
1091                 iplen = dhcpcd_get_prefix_value(i, pfx, "subnet_cidr");
1092         else if ((ip = dhcpcd_get_value(i, "ra1_prefix")))
1093                 iplen = NULL;
1094         else if ((ip = dhcpcd_get_prefix_value(i, pfx,
1095             "dhcp6_ia_na1_ia_addr1")))
1096                 iplen = "128";
1097         else if ((ip = dhcpcd_get_prefix_value(i, pfx,
1098             "delegated_dhcp6_prefix")))
1099                 iplen = NULL;
1100         else {
1101                 ip = NULL;
1102                 iplen = NULL;
1103         }
1104
1105         len = strlen(i->ifname) + strlen(reason) + 3;
1106         if (showssid && i->ssid)
1107                 len += strlen(i->ssid) + 1;
1108         if (ip)
1109                 len += strlen(ip) + 1;
1110         if (iplen)
1111                 len += strlen(iplen) + 1;
1112         msg = p = malloc(len);
1113         if (msg == NULL)
1114                 return NULL;
1115         p += snprintf(msg, len, "%s: %s", i->ifname, reason);
1116         if (showssid)
1117                 p += snprintf(p, len - (size_t)(p - msg), " %s", i->ssid);
1118         if (iplen)
1119                 snprintf(p, len - (size_t)(p - msg), " %s/%s", ip, iplen);
1120         else if (ip)
1121                 snprintf(p, len - (size_t)(p - msg), " %s", ip);
1122
1123         if (new_msg) {
1124                 if (i->last_message == NULL || strcmp(i->last_message, msg))
1125                         *new_msg = true;
1126                 else
1127                         *new_msg = false;
1128         }
1129         free(i->last_message);
1130         i->last_message = strdup(msg);
1131
1132         return msg;
1133 }