ui/ncurses: clear DNS server setting before appending new servers
[petitboot] / lib / pb-protocol / pb-protocol.c
1
2 #include <assert.h>
3 #include <errno.h>
4 #include <string.h>
5 #include <stdbool.h>
6 #include <stdint.h>
7 #include <asm/byteorder.h>
8
9 #include <talloc/talloc.h>
10 #include <list/list.h>
11 #include <log/log.h>
12
13 #include "pb-protocol.h"
14
15
16 /* Message format:
17  *
18  * 4-byte action, determines the remaining message content
19  * 4-byte total payload len
20  *   - not including action and payload len header
21  *
22  * action = 0x1: device add message
23  *  payload:
24  *   4-byte len, id
25  *   1-byte type
26  *   4-byte len, name
27  *   4-byte len, description
28  *   4-byte len, icon_file
29  *
30  *   4-byte option count
31  *   for each option:
32  *    4-byte len, id
33  *    4-byte len, name
34  *    4-byte len, description
35  *    4-byte len, icon_file
36  *    4-byte len, boot_image_file
37  *    4-byte len, initrd_file
38  *    4-byte len, dtb_file
39  *    4-byte len, boot_args
40  *
41  * action = 0x2: device remove message
42  *  payload:
43  *   4-byte len, id
44  *
45  * action = 0x3: boot
46  *  payload:
47  *   4-byte len, boot option id
48  *   4-byte len, boot_image_file
49  *   4-byte len, initrd_file
50  *   4-byte len, dtb_file
51  *   4-byte len, boot_args
52  *
53  */
54
55 void pb_protocol_dump_device(const struct device *dev, const char *text,
56         FILE *stream)
57 {
58         struct boot_option *opt;
59
60         fprintf(stream, "%snew dev:\n", text);
61         fprintf(stream, "%s\tid:   %s\n", text, dev->id);
62         fprintf(stream, "%s\tname: %s\n", text, dev->name);
63         fprintf(stream, "%s\tdesc: %s\n", text, dev->description);
64         fprintf(stream, "%s\ticon: %s\n", text, dev->icon_file);
65         fprintf(stream, "%s\tboot options:\n", text);
66         list_for_each_entry(&dev->boot_options, opt, list) {
67                 fprintf(stream, "%s\t\tid:   %s\n", text, opt->id);
68                 fprintf(stream, "%s\t\tname: %s\n", text, opt->name);
69                 fprintf(stream, "%s\t\tdesc: %s\n", text, opt->description);
70                 fprintf(stream, "%s\t\ticon: %s\n", text, opt->icon_file);
71                 fprintf(stream, "%s\t\tboot: %s\n", text, opt->boot_image_file);
72                 fprintf(stream, "%s\t\tinit: %s\n", text, opt->initrd_file);
73                 fprintf(stream, "%s\t\tdtb:  %s\n", text, opt->dtb_file);
74                 fprintf(stream, "%s\t\targs: %s\n", text, opt->boot_args);
75         }
76 }
77
78 int pb_protocol_device_cmp(const struct device *a, const struct device *b)
79 {
80         return !strcmp(a->id, b->id);
81 }
82
83 int pb_protocol_boot_option_cmp(const struct boot_option *a,
84         const struct boot_option *b)
85 {
86         return !strcmp(a->id, b->id);
87 }
88
89 /* Write a string into the buffer, starting at pos.
90  *
91  * Returns the total length used for the write, including length header.
92  */
93 int pb_protocol_serialise_string(char *pos, const char *str)
94 {
95         int len = 0;
96
97         if (str)
98                 len = strlen(str);
99
100         *(uint32_t *)pos = __cpu_to_be32(len);
101         pos += sizeof(uint32_t);
102
103         memcpy(pos, str, len);
104
105         return len + sizeof(uint32_t);
106 }
107
108 /* Read a string from a buffer, allocating the new string as necessary.
109  *
110  * @param[in] ctx       The talloc context to base the allocation on
111  * @param[in,out] pos   Where to start reading
112  * @param[in,out] len   The amount of data remaining in the buffer
113  * @param[out] str      Pointer to resuling string
114  * @return              zero on success, non-zero on failure
115  */
116 static int read_string(void *ctx, const char **pos, unsigned int *len,
117         char **str)
118 {
119         uint32_t str_len, read_len;
120
121         if (*len < sizeof(uint32_t))
122                 return -1;
123
124         str_len = __be32_to_cpu(*(uint32_t *)(*pos));
125         read_len = sizeof(uint32_t);
126
127         if (read_len + str_len > *len)
128                 return -1;
129
130         if (str_len == 0)
131                 *str = NULL;
132         else
133                 *str = talloc_strndup(ctx, *pos + read_len, str_len);
134
135         read_len += str_len;
136
137         /* all ok, update the caller's pointers */
138         *pos += read_len;
139         *len -= read_len;
140
141         return 0;
142 }
143
144 static int read_u32(const char **pos, unsigned int *len, unsigned int *p)
145 {
146         if (*len < sizeof(uint32_t))
147                 return -1;
148
149         *p = (unsigned int)__be32_to_cpu(*(uint32_t *)(*pos));
150         *pos += sizeof(uint32_t);
151         *len -= sizeof(uint32_t);
152
153         return 0;
154 }
155
156 char *pb_protocol_deserialise_string(void *ctx,
157                 const struct pb_protocol_message *message)
158 {
159         const char *buf;
160         char *str;
161         unsigned int len;
162
163         len = message->payload_len;
164         buf = message->payload;
165
166         if (read_string(ctx, &buf, &len, &str))
167                 return NULL;
168
169         return str;
170 }
171
172 static int optional_strlen(const char *str)
173 {
174         if (!str)
175                 return 0;
176         return strlen(str);
177 }
178
179 int pb_protocol_device_len(const struct device *dev)
180 {
181         return  4 + optional_strlen(dev->id) +
182                 sizeof(dev->type) +
183                 4 + optional_strlen(dev->name) +
184                 4 + optional_strlen(dev->description) +
185                 4 + optional_strlen(dev->icon_file);
186 }
187
188 int pb_protocol_boot_option_len(const struct boot_option *opt)
189 {
190
191         return  4 + optional_strlen(opt->device_id) +
192                 4 + optional_strlen(opt->id) +
193                 4 + optional_strlen(opt->name) +
194                 4 + optional_strlen(opt->description) +
195                 4 + optional_strlen(opt->icon_file) +
196                 4 + optional_strlen(opt->boot_image_file) +
197                 4 + optional_strlen(opt->initrd_file) +
198                 4 + optional_strlen(opt->dtb_file) +
199                 4 + optional_strlen(opt->boot_args) +
200                 sizeof(opt->is_default);
201 }
202
203 int pb_protocol_boot_len(const struct boot_command *boot)
204 {
205         return  4 + optional_strlen(boot->option_id) +
206                 4 + optional_strlen(boot->boot_image_file) +
207                 4 + optional_strlen(boot->initrd_file) +
208                 4 + optional_strlen(boot->dtb_file) +
209                 4 + optional_strlen(boot->boot_args);
210 }
211
212 int pb_protocol_boot_status_len(const struct boot_status *status)
213 {
214         return  4 +
215                 4 + optional_strlen(status->message) +
216                 4 + optional_strlen(status->detail) +
217                 4;
218 }
219
220 int pb_protocol_system_info_len(const struct system_info *sysinfo)
221 {
222         unsigned int len, i;
223
224         len =   4 + optional_strlen(sysinfo->type) +
225                 4 + optional_strlen(sysinfo->identifier) +
226                 4 + 4;
227
228         for (i = 0; i < sysinfo->n_interfaces; i++) {
229                 struct interface_info *if_info = sysinfo->interfaces[i];
230                 len +=  4 + if_info->hwaddr_size +
231                         4 + optional_strlen(if_info->name) +
232                         sizeof(if_info->link);
233         }
234
235         for (i = 0; i < sysinfo->n_blockdevs; i++) {
236                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
237                 len +=  4 + optional_strlen(bd_info->name) +
238                         4 + optional_strlen(bd_info->uuid) +
239                         4 + optional_strlen(bd_info->mountpoint);
240         }
241
242         return len;
243 }
244
245 static int pb_protocol_interface_config_len(struct interface_config *conf)
246 {
247         unsigned int len;
248
249         len =   sizeof(conf->hwaddr) +
250                 4 /* conf->ignore */;
251
252         if (conf->ignore)
253                 return len;
254
255         len += 4 /* conf->method */;
256
257         if (conf->method == CONFIG_METHOD_STATIC) {
258                 len += 4 + optional_strlen(conf->static_config.address);
259                 len += 4 + optional_strlen(conf->static_config.gateway);
260         }
261
262         return len;
263 }
264
265 int pb_protocol_config_len(const struct config *config)
266 {
267         unsigned int i, len;
268
269         len =   4 /* config->autoboot_enabled */ +
270                 4 /* config->autoboot_timeout_sec */;
271
272         len += 4;
273         for (i = 0; i < config->network.n_interfaces; i++)
274                 len += pb_protocol_interface_config_len(
275                                 config->network.interfaces[i]);
276
277         len += 4;
278         for (i = 0; i < config->network.n_dns_servers; i++)
279                 len += 4 + optional_strlen(config->network.dns_servers[i]);
280
281         len += 4;
282         len += config->n_boot_priorities * 8;
283
284         return len;
285 }
286
287 int pb_protocol_serialise_device(const struct device *dev,
288                 char *buf, int buf_len)
289 {
290         char *pos = buf;
291
292         pos += pb_protocol_serialise_string(pos, dev->id);
293         *(enum device_type *)pos = dev->type;
294         pos += sizeof(enum device_type);
295         pos += pb_protocol_serialise_string(pos, dev->name);
296         pos += pb_protocol_serialise_string(pos, dev->description);
297         pos += pb_protocol_serialise_string(pos, dev->icon_file);
298
299         assert(pos <= buf + buf_len);
300         (void)buf_len;
301
302         return 0;
303 }
304
305 int pb_protocol_serialise_boot_option(const struct boot_option *opt,
306                 char *buf, int buf_len)
307 {
308         char *pos = buf;
309
310         pos += pb_protocol_serialise_string(pos, opt->device_id);
311         pos += pb_protocol_serialise_string(pos, opt->id);
312         pos += pb_protocol_serialise_string(pos, opt->name);
313         pos += pb_protocol_serialise_string(pos, opt->description);
314         pos += pb_protocol_serialise_string(pos, opt->icon_file);
315         pos += pb_protocol_serialise_string(pos, opt->boot_image_file);
316         pos += pb_protocol_serialise_string(pos, opt->initrd_file);
317         pos += pb_protocol_serialise_string(pos, opt->dtb_file);
318         pos += pb_protocol_serialise_string(pos, opt->boot_args);
319
320         *(bool *)pos = opt->is_default;
321         pos += sizeof(bool);
322
323         assert(pos <= buf + buf_len);
324         (void)buf_len;
325
326         return 0;
327 }
328
329 int pb_protocol_serialise_boot_command(const struct boot_command *boot,
330                 char *buf, int buf_len)
331 {
332         char *pos = buf;
333
334         pos += pb_protocol_serialise_string(pos, boot->option_id);
335         pos += pb_protocol_serialise_string(pos, boot->boot_image_file);
336         pos += pb_protocol_serialise_string(pos, boot->initrd_file);
337         pos += pb_protocol_serialise_string(pos, boot->dtb_file);
338         pos += pb_protocol_serialise_string(pos, boot->boot_args);
339
340         assert(pos <= buf + buf_len);
341         (void)buf_len;
342
343         return 0;
344 }
345
346 int pb_protocol_serialise_boot_status(const struct boot_status *status,
347                 char *buf, int buf_len)
348 {
349         char *pos = buf;
350
351         *(uint32_t *)pos = __cpu_to_be32(status->type);
352         pos += sizeof(uint32_t);
353
354         pos += pb_protocol_serialise_string(pos, status->message);
355         pos += pb_protocol_serialise_string(pos, status->detail);
356
357         *(uint32_t *)pos = __cpu_to_be32(status->type);
358         pos += sizeof(uint32_t);
359
360         assert(pos <= buf + buf_len);
361         (void)buf_len;
362
363         return 0;
364 }
365
366 int pb_protocol_serialise_system_info(const struct system_info *sysinfo,
367                 char *buf, int buf_len)
368 {
369         char *pos = buf;
370         unsigned int i;
371
372         pos += pb_protocol_serialise_string(pos, sysinfo->type);
373         pos += pb_protocol_serialise_string(pos, sysinfo->identifier);
374
375         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_interfaces);
376         pos += sizeof(uint32_t);
377
378         for (i = 0; i < sysinfo->n_interfaces; i++) {
379                 struct interface_info *if_info = sysinfo->interfaces[i];
380
381                 *(uint32_t *)pos = __cpu_to_be32(if_info->hwaddr_size);
382                 pos += sizeof(uint32_t);
383
384                 memcpy(pos, if_info->hwaddr, if_info->hwaddr_size);
385                 pos += if_info->hwaddr_size;
386
387                 pos += pb_protocol_serialise_string(pos, if_info->name);
388
389                 *(bool *)pos = if_info->link;
390                 pos += sizeof(bool);
391         }
392
393         *(uint32_t *)pos = __cpu_to_be32(sysinfo->n_blockdevs);
394         pos += sizeof(uint32_t);
395
396         for (i = 0; i < sysinfo->n_blockdevs; i++) {
397                 struct blockdev_info *bd_info = sysinfo->blockdevs[i];
398
399                 pos += pb_protocol_serialise_string(pos, bd_info->name);
400                 pos += pb_protocol_serialise_string(pos, bd_info->uuid);
401                 pos += pb_protocol_serialise_string(pos, bd_info->mountpoint);
402         }
403
404         assert(pos <= buf + buf_len);
405         (void)buf_len;
406
407         return 0;
408 }
409
410 static int pb_protocol_serialise_config_interface(char *buf,
411                 struct interface_config *conf)
412 {
413         char *pos = buf;
414
415         memcpy(pos, conf->hwaddr, sizeof(conf->hwaddr));
416         pos += sizeof(conf->hwaddr);
417
418         *(uint32_t *)pos = conf->ignore;
419         pos += 4;
420
421         if (conf->ignore)
422                 return pos - buf;
423
424         *(uint32_t *)pos = __cpu_to_be32(conf->method);
425         pos += 4;
426
427         if (conf->method == CONFIG_METHOD_STATIC) {
428                 pos += pb_protocol_serialise_string(pos,
429                                 conf->static_config.address);
430                 pos += pb_protocol_serialise_string(pos,
431                                 conf->static_config.gateway);
432         }
433
434         return pos - buf;
435 }
436
437 int pb_protocol_serialise_config(const struct config *config,
438                 char *buf, int buf_len)
439 {
440         char *pos = buf;
441         unsigned int i;
442
443         *(uint32_t *)pos = config->autoboot_enabled;
444         pos += 4;
445
446         *(uint32_t *)pos = __cpu_to_be32(config->autoboot_timeout_sec);
447         pos += 4;
448
449         *(uint32_t *)pos = __cpu_to_be32(config->network.n_interfaces);
450         pos += 4;
451         for (i = 0; i < config->network.n_interfaces; i++) {
452                 struct interface_config *iface =
453                         config->network.interfaces[i];
454                 pos += pb_protocol_serialise_config_interface(pos, iface);
455         }
456
457         *(uint32_t *)pos = __cpu_to_be32(config->network.n_dns_servers);
458         pos += 4;
459         for (i = 0; i < config->network.n_dns_servers; i++) {
460                 pos += pb_protocol_serialise_string(pos,
461                                 config->network.dns_servers[i]);
462         }
463
464         *(uint32_t *)pos = __cpu_to_be32(config->n_boot_priorities);
465         pos += 4;
466         for (i = 0; i < config->n_boot_priorities; i++) {
467                 *(uint32_t *)pos =
468                         __cpu_to_be32(config->boot_priorities[i].type);
469                 pos += 4;
470                 *(uint32_t *)pos =
471                         __cpu_to_be32(config->boot_priorities[i].priority);
472                 pos += 4;
473         }
474
475         assert(pos <= buf + buf_len);
476         (void)buf_len;
477
478         return 0;
479 }
480
481 int pb_protocol_write_message(int fd, struct pb_protocol_message *message)
482 {
483         int total_len, rc;
484         char *pos;
485
486         total_len = sizeof(*message) + message->payload_len;
487
488         message->payload_len = __cpu_to_be32(message->payload_len);
489         message->action = __cpu_to_be32(message->action);
490
491         for (pos = (void *)message; total_len;) {
492                 rc = write(fd, pos, total_len);
493
494                 if (rc <= 0)
495                         break;
496
497                 total_len -= rc;
498                 pos += rc;
499         }
500
501         talloc_free(message);
502
503         if (!total_len)
504                 return 0;
505
506         pb_log("%s: failed: %s\n", __func__, strerror(errno));
507         return -1;
508 }
509
510 struct pb_protocol_message *pb_protocol_create_message(void *ctx,
511                 enum pb_protocol_action action, int payload_len)
512 {
513         struct pb_protocol_message *message;
514
515         if (payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
516                 pb_log("%s: payload too big %u/%u\n", __func__, payload_len,
517                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
518                 return NULL;
519         }
520
521         message = talloc_size(ctx, sizeof(*message) + payload_len);
522
523         /* we convert these to big-endian in write_message() */
524         message->action = action;
525         message->payload_len = payload_len;
526
527         return message;
528
529 }
530
531 struct pb_protocol_message *pb_protocol_read_message(void *ctx, int fd)
532 {
533         struct pb_protocol_message *message, m;
534         int rc;
535         unsigned int len;
536
537         /* use the stack for the initial 8-byte read */
538
539         rc = read(fd, &m, sizeof(m));
540         if (rc != sizeof(m))
541                 return NULL;
542
543         m.payload_len = __be32_to_cpu(m.payload_len);
544         m.action = __be32_to_cpu(m.action);
545
546         if (m.payload_len > PB_PROTOCOL_MAX_PAYLOAD_SIZE) {
547                 pb_log("%s: payload too big %u/%u\n", __func__, m.payload_len,
548                         PB_PROTOCOL_MAX_PAYLOAD_SIZE);
549                 return NULL;
550         }
551
552         message = talloc_size(ctx, sizeof(m) + m.payload_len);
553         memcpy(message, &m, sizeof(m));
554
555         for (len = 0; len < m.payload_len;) {
556                 rc = read(fd, message->payload + len, m.payload_len - len);
557
558                 if (rc <= 0) {
559                         talloc_free(message);
560                         pb_log("%s: failed (%u): %s\n", __func__, len,
561                                 strerror(errno));
562                         return NULL;
563                 }
564
565                 len += rc;
566         }
567
568         return message;
569 }
570
571
572 int pb_protocol_deserialise_device(struct device *dev,
573                 const struct pb_protocol_message *message)
574 {
575         unsigned int len;
576         const char *pos;
577         int rc = -1;
578
579         len = message->payload_len;
580         pos = message->payload;
581
582         if (read_string(dev, &pos, &len, &dev->id))
583                 goto out;
584
585         if (len < sizeof(enum device_type))
586                 goto out;
587         dev->type = *(enum device_type *)(pos);
588         pos += sizeof(enum device_type);
589         len -= sizeof(enum device_type);
590
591         if (read_string(dev, &pos, &len, &dev->name))
592                 goto out;
593
594         if (read_string(dev, &pos, &len, &dev->description))
595                 goto out;
596
597         if (read_string(dev, &pos, &len, &dev->icon_file))
598                 goto out;
599
600         rc = 0;
601
602 out:
603         return rc;
604 }
605
606 int pb_protocol_deserialise_boot_option(struct boot_option *opt,
607                 const struct pb_protocol_message *message)
608 {
609         unsigned int len;
610         const char *pos;
611         int rc = -1;
612
613         len = message->payload_len;
614         pos = message->payload;
615
616         if (read_string(opt, &pos, &len, &opt->device_id))
617                 goto out;
618
619         if (read_string(opt, &pos, &len, &opt->id))
620                 goto out;
621
622         if (read_string(opt, &pos, &len, &opt->name))
623                 goto out;
624
625         if (read_string(opt, &pos, &len, &opt->description))
626                 goto out;
627
628         if (read_string(opt, &pos, &len, &opt->icon_file))
629                 goto out;
630
631         if (read_string(opt, &pos, &len, &opt->boot_image_file))
632                 goto out;
633
634         if (read_string(opt, &pos, &len, &opt->initrd_file))
635                 goto out;
636
637         if (read_string(opt, &pos, &len, &opt->dtb_file))
638                 goto out;
639
640         if (read_string(opt, &pos, &len, &opt->boot_args))
641                 goto out;
642
643         if (len < sizeof(bool))
644                 goto out;
645         opt->is_default = *(bool *)(pos);
646
647         rc = 0;
648
649 out:
650         return rc;
651 }
652
653 int pb_protocol_deserialise_boot_command(struct boot_command *cmd,
654                 const struct pb_protocol_message *message)
655 {
656         unsigned int len;
657         const char *pos;
658         int rc = -1;
659
660         len = message->payload_len;
661         pos = message->payload;
662
663         if (read_string(cmd, &pos, &len, &cmd->option_id))
664                 goto out;
665
666         if (read_string(cmd, &pos, &len, &cmd->boot_image_file))
667                 goto out;
668
669         if (read_string(cmd, &pos, &len, &cmd->initrd_file))
670                 goto out;
671
672         if (read_string(cmd, &pos, &len, &cmd->dtb_file))
673                 goto out;
674
675         if (read_string(cmd, &pos, &len, &cmd->boot_args))
676                 goto out;
677
678         rc = 0;
679
680 out:
681         return rc;
682 }
683
684 int pb_protocol_deserialise_boot_status(struct boot_status *status,
685                 const struct pb_protocol_message *message)
686 {
687         unsigned int len;
688         const char *pos;
689         int rc = -1;
690
691         len = message->payload_len;
692         pos = message->payload;
693
694         /* first up, the type enum... */
695         if (len < sizeof(uint32_t))
696                 goto out;
697
698         status->type = __be32_to_cpu(*(uint32_t *)(pos));
699
700         switch (status->type) {
701         case BOOT_STATUS_ERROR:
702         case BOOT_STATUS_INFO:
703                 break;
704         default:
705                 goto out;
706         }
707
708         pos += sizeof(uint32_t);
709         len -= sizeof(uint32_t);
710
711         /* message and detail strings */
712         if (read_string(status, &pos, &len, &status->message))
713                 goto out;
714
715         if (read_string(status, &pos, &len, &status->detail))
716                 goto out;
717
718         /* and finally, progress */
719         if (len < sizeof(uint32_t))
720                 goto out;
721
722         status->progress = __be32_to_cpu(*(uint32_t *)(pos));
723
724         /* clamp to 100% */
725         if (status->progress > 100)
726                 status->progress = 100;
727
728         rc = 0;
729
730 out:
731         return rc;
732 }
733
734 int pb_protocol_deserialise_system_info(struct system_info *sysinfo,
735                 const struct pb_protocol_message *message)
736 {
737         unsigned int len, i;
738         const char *pos;
739         int rc = -1;
740
741         len = message->payload_len;
742         pos = message->payload;
743
744         /* type and identifier strings */
745         if (read_string(sysinfo, &pos, &len, &sysinfo->type))
746                 goto out;
747
748         if (read_string(sysinfo, &pos, &len, &sysinfo->identifier))
749                 goto out;
750
751         /* number of interfaces */
752         if (read_u32(&pos, &len, &sysinfo->n_interfaces))
753                 goto out;
754
755         sysinfo->interfaces = talloc_array(sysinfo, struct interface_info *,
756                         sysinfo->n_interfaces);
757
758         for (i = 0; i < sysinfo->n_interfaces; i++) {
759                 struct interface_info *if_info = talloc(sysinfo,
760                                                         struct interface_info);
761
762                 if (read_u32(&pos, &len, &if_info->hwaddr_size))
763                         goto out;
764
765                 if (len < if_info->hwaddr_size)
766                         goto out;
767
768                 if_info->hwaddr = talloc_memdup(if_info, pos,
769                                                 if_info->hwaddr_size);
770                 pos += if_info->hwaddr_size;
771                 len -= if_info->hwaddr_size;
772
773                 if (read_string(if_info, &pos, &len, &if_info->name))
774                         goto out;
775
776                 if_info->link = *(bool *)pos;
777                 pos += sizeof(if_info->link);
778
779                 sysinfo->interfaces[i] = if_info;
780         }
781
782         /* number of interfaces */
783         if (read_u32(&pos, &len, &sysinfo->n_blockdevs))
784                 goto out;
785
786         sysinfo->blockdevs = talloc_array(sysinfo, struct blockdev_info *,
787                         sysinfo->n_blockdevs);
788
789         for (i = 0; i < sysinfo->n_blockdevs; i++) {
790                 struct blockdev_info *bd_info = talloc(sysinfo,
791                                                         struct blockdev_info);
792
793                 if (read_string(bd_info, &pos, &len, &bd_info->name))
794                         goto out;
795
796                 if (read_string(bd_info, &pos, &len, &bd_info->uuid))
797                         goto out;
798
799                 if (read_string(bd_info, &pos, &len, &bd_info->mountpoint))
800                         goto out;
801
802                 sysinfo->blockdevs[i] = bd_info;
803         }
804         rc = 0;
805
806 out:
807         return rc;
808 }
809
810 static int pb_protocol_deserialise_config_interface(const char **buf,
811                 unsigned int *len, struct interface_config *iface)
812 {
813         unsigned int tmp;
814
815         if (*len < sizeof(iface->hwaddr))
816                 return -1;
817
818         memcpy(iface->hwaddr, *buf, sizeof(iface->hwaddr));
819         *buf += sizeof(iface->hwaddr);
820         *len -= sizeof(iface->hwaddr);
821
822         if (read_u32(buf, len, &tmp))
823                 return -1;
824         iface->ignore = !!tmp;
825
826         if (iface->ignore)
827                 return 0;
828
829         if (read_u32(buf, len, &iface->method))
830                 return -1;
831
832         if (iface->method == CONFIG_METHOD_STATIC) {
833                 if (read_string(iface, buf, len, &iface->static_config.address))
834                         return -1;
835
836                 if (read_string(iface, buf, len, &iface->static_config.gateway))
837                         return -1;
838         }
839
840         return 0;
841 }
842
843 int pb_protocol_deserialise_config(struct config *config,
844                 const struct pb_protocol_message *message)
845 {
846         unsigned int len, i, tmp;
847         const char *pos;
848         int rc = -1;
849
850         len = message->payload_len;
851         pos = message->payload;
852
853         if (read_u32(&pos, &len, &tmp))
854                 goto out;
855         config->autoboot_enabled = !!tmp;
856
857         if (read_u32(&pos, &len, &config->autoboot_timeout_sec))
858                 goto out;
859
860         if (read_u32(&pos, &len, &config->network.n_interfaces))
861                 goto out;
862
863         config->network.interfaces = talloc_array(config,
864                         struct interface_config *, config->network.n_interfaces);
865
866         for (i = 0; i < config->network.n_interfaces; i++) {
867                 struct interface_config *iface = talloc_zero(
868                                 config->network.interfaces,
869                                 struct interface_config);
870                 if (pb_protocol_deserialise_config_interface(&pos, &len, iface))
871                         goto out;
872                 config->network.interfaces[i] = iface;
873         }
874
875         if (read_u32(&pos, &len, &config->network.n_dns_servers))
876                 goto out;
877         config->network.dns_servers = talloc_array(config, const char *,
878                         config->network.n_dns_servers);
879
880         for (i = 0; i < config->network.n_dns_servers; i++) {
881                 char *tmp;
882                 if (read_string(config->network.dns_servers, &pos, &len, &tmp))
883                         goto out;
884                 config->network.dns_servers[i] = tmp;
885         }
886
887         if (read_u32(&pos, &len, &config->n_boot_priorities))
888                 goto out;
889         config->boot_priorities = talloc_array(config, struct boot_priority,
890                         config->n_boot_priorities);
891
892         for (i = 0; i < config->n_boot_priorities; i++) {
893                 if (read_u32(&pos, &len, &tmp))
894                         goto out;
895                 config->boot_priorities[i].type = tmp;
896         }
897
898         rc = 0;
899
900 out:
901         return rc;
902 }