xref: /openbmc/linux/tools/hv/hv_kvp_daemon.c (revision f969fd59)
1 /*
2  * An implementation of key value pair (KVP) functionality for Linux.
3  *
4  *
5  * Copyright (C) 2010, Novell, Inc.
6  * Author : K. Y. Srinivasan <ksrinivasan@novell.com>
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License version 2 as published
10  * by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
15  * NON INFRINGEMENT.  See the GNU General Public License for more
16  * details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21  *
22  */
23 
24 
25 #include <sys/poll.h>
26 #include <sys/utsname.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <string.h>
31 #include <ctype.h>
32 #include <errno.h>
33 #include <arpa/inet.h>
34 #include <linux/hyperv.h>
35 #include <ifaddrs.h>
36 #include <netdb.h>
37 #include <syslog.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 #include <dirent.h>
41 #include <net/if.h>
42 #include <limits.h>
43 #include <getopt.h>
44 
45 /*
46  * KVP protocol: The user mode component first registers with the
47  * kernel component. Subsequently, the kernel component requests, data
48  * for the specified keys. In response to this message the user mode component
49  * fills in the value corresponding to the specified key. We overload the
50  * sequence field in the cn_msg header to define our KVP message types.
51  *
52  * We use this infrastructure for also supporting queries from user mode
53  * application for state that may be maintained in the KVP kernel component.
54  *
55  */
56 
57 
58 enum key_index {
59 	FullyQualifiedDomainName = 0,
60 	IntegrationServicesVersion, /*This key is serviced in the kernel*/
61 	NetworkAddressIPv4,
62 	NetworkAddressIPv6,
63 	OSBuildNumber,
64 	OSName,
65 	OSMajorVersion,
66 	OSMinorVersion,
67 	OSVersion,
68 	ProcessorArchitecture
69 };
70 
71 
72 enum {
73 	IPADDR = 0,
74 	NETMASK,
75 	GATEWAY,
76 	DNS
77 };
78 
79 static int in_hand_shake;
80 
81 static char *os_name = "";
82 static char *os_major = "";
83 static char *os_minor = "";
84 static char *processor_arch;
85 static char *os_build;
86 static char *os_version;
87 static char *lic_version = "Unknown version";
88 static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
89 static struct utsname uts_buf;
90 
91 /*
92  * The location of the interface configuration file.
93  */
94 
95 #define KVP_CONFIG_LOC	"/var/lib/hyperv"
96 
97 #ifndef KVP_SCRIPTS_PATH
98 #define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
99 #endif
100 
101 #define KVP_NET_DIR "/sys/class/net/"
102 
103 #define MAX_FILE_NAME 100
104 #define ENTRIES_PER_BLOCK 50
105 
106 struct kvp_record {
107 	char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
108 	char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
109 };
110 
111 struct kvp_file_state {
112 	int fd;
113 	int num_blocks;
114 	struct kvp_record *records;
115 	int num_records;
116 	char fname[MAX_FILE_NAME];
117 };
118 
119 static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
120 
kvp_acquire_lock(int pool)121 static void kvp_acquire_lock(int pool)
122 {
123 	struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
124 	fl.l_pid = getpid();
125 
126 	if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
127 		syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
128 				errno, strerror(errno));
129 		exit(EXIT_FAILURE);
130 	}
131 }
132 
kvp_release_lock(int pool)133 static void kvp_release_lock(int pool)
134 {
135 	struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
136 	fl.l_pid = getpid();
137 
138 	if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
139 		syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
140 				errno, strerror(errno));
141 		exit(EXIT_FAILURE);
142 	}
143 }
144 
kvp_update_file(int pool)145 static void kvp_update_file(int pool)
146 {
147 	FILE *filep;
148 
149 	/*
150 	 * We are going to write our in-memory registry out to
151 	 * disk; acquire the lock first.
152 	 */
153 	kvp_acquire_lock(pool);
154 
155 	filep = fopen(kvp_file_info[pool].fname, "we");
156 	if (!filep) {
157 		syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
158 				errno, strerror(errno));
159 		kvp_release_lock(pool);
160 		exit(EXIT_FAILURE);
161 	}
162 
163 	fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
164 				kvp_file_info[pool].num_records, filep);
165 
166 	if (ferror(filep) || fclose(filep)) {
167 		kvp_release_lock(pool);
168 		syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
169 		exit(EXIT_FAILURE);
170 	}
171 
172 	kvp_release_lock(pool);
173 }
174 
kvp_update_mem_state(int pool)175 static void kvp_update_mem_state(int pool)
176 {
177 	FILE *filep;
178 	size_t records_read = 0;
179 	struct kvp_record *record = kvp_file_info[pool].records;
180 	struct kvp_record *readp;
181 	int num_blocks = kvp_file_info[pool].num_blocks;
182 	int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
183 
184 	kvp_acquire_lock(pool);
185 
186 	filep = fopen(kvp_file_info[pool].fname, "re");
187 	if (!filep) {
188 		syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
189 				errno, strerror(errno));
190 		kvp_release_lock(pool);
191 		exit(EXIT_FAILURE);
192 	}
193 	for (;;) {
194 		readp = &record[records_read];
195 		records_read += fread(readp, sizeof(struct kvp_record),
196 				ENTRIES_PER_BLOCK * num_blocks - records_read,
197 				filep);
198 
199 		if (ferror(filep)) {
200 			syslog(LOG_ERR,
201 				"Failed to read file, pool: %d; error: %d %s",
202 				 pool, errno, strerror(errno));
203 			kvp_release_lock(pool);
204 			exit(EXIT_FAILURE);
205 		}
206 
207 		if (!feof(filep)) {
208 			/*
209 			 * We have more data to read.
210 			 */
211 			num_blocks++;
212 			record = realloc(record, alloc_unit * num_blocks);
213 
214 			if (record == NULL) {
215 				syslog(LOG_ERR, "malloc failed");
216 				kvp_release_lock(pool);
217 				exit(EXIT_FAILURE);
218 			}
219 			continue;
220 		}
221 		break;
222 	}
223 
224 	kvp_file_info[pool].num_blocks = num_blocks;
225 	kvp_file_info[pool].records = record;
226 	kvp_file_info[pool].num_records = records_read;
227 
228 	fclose(filep);
229 	kvp_release_lock(pool);
230 }
231 
kvp_file_init(void)232 static int kvp_file_init(void)
233 {
234 	int  fd;
235 	char *fname;
236 	int i;
237 	int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
238 
239 	if (access(KVP_CONFIG_LOC, F_OK)) {
240 		if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
241 			syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
242 					errno, strerror(errno));
243 			exit(EXIT_FAILURE);
244 		}
245 	}
246 
247 	for (i = 0; i < KVP_POOL_COUNT; i++) {
248 		fname = kvp_file_info[i].fname;
249 		sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
250 		fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
251 
252 		if (fd == -1)
253 			return 1;
254 
255 		kvp_file_info[i].fd = fd;
256 		kvp_file_info[i].num_blocks = 1;
257 		kvp_file_info[i].records = malloc(alloc_unit);
258 		if (kvp_file_info[i].records == NULL)
259 			return 1;
260 		kvp_file_info[i].num_records = 0;
261 		kvp_update_mem_state(i);
262 	}
263 
264 	return 0;
265 }
266 
kvp_key_delete(int pool,const __u8 * key,int key_size)267 static int kvp_key_delete(int pool, const __u8 *key, int key_size)
268 {
269 	int i;
270 	int j, k;
271 	int num_records;
272 	struct kvp_record *record;
273 
274 	/*
275 	 * First update the in-memory state.
276 	 */
277 	kvp_update_mem_state(pool);
278 
279 	num_records = kvp_file_info[pool].num_records;
280 	record = kvp_file_info[pool].records;
281 
282 	for (i = 0; i < num_records; i++) {
283 		if (memcmp(key, record[i].key, key_size))
284 			continue;
285 		/*
286 		 * Found a match; just move the remaining
287 		 * entries up.
288 		 */
289 		if (i == (num_records - 1)) {
290 			kvp_file_info[pool].num_records--;
291 			kvp_update_file(pool);
292 			return 0;
293 		}
294 
295 		j = i;
296 		k = j + 1;
297 		for (; k < num_records; k++) {
298 			strcpy(record[j].key, record[k].key);
299 			strcpy(record[j].value, record[k].value);
300 			j++;
301 		}
302 
303 		kvp_file_info[pool].num_records--;
304 		kvp_update_file(pool);
305 		return 0;
306 	}
307 	return 1;
308 }
309 
kvp_key_add_or_modify(int pool,const __u8 * key,int key_size,const __u8 * value,int value_size)310 static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
311 				 const __u8 *value, int value_size)
312 {
313 	int i;
314 	int num_records;
315 	struct kvp_record *record;
316 	int num_blocks;
317 
318 	if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
319 		(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
320 		return 1;
321 
322 	/*
323 	 * First update the in-memory state.
324 	 */
325 	kvp_update_mem_state(pool);
326 
327 	num_records = kvp_file_info[pool].num_records;
328 	record = kvp_file_info[pool].records;
329 	num_blocks = kvp_file_info[pool].num_blocks;
330 
331 	for (i = 0; i < num_records; i++) {
332 		if (memcmp(key, record[i].key, key_size))
333 			continue;
334 		/*
335 		 * Found a match; just update the value -
336 		 * this is the modify case.
337 		 */
338 		memcpy(record[i].value, value, value_size);
339 		kvp_update_file(pool);
340 		return 0;
341 	}
342 
343 	/*
344 	 * Need to add a new entry;
345 	 */
346 	if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
347 		/* Need to allocate a larger array for reg entries. */
348 		record = realloc(record, sizeof(struct kvp_record) *
349 			 ENTRIES_PER_BLOCK * (num_blocks + 1));
350 
351 		if (record == NULL)
352 			return 1;
353 		kvp_file_info[pool].num_blocks++;
354 
355 	}
356 	memcpy(record[i].value, value, value_size);
357 	memcpy(record[i].key, key, key_size);
358 	kvp_file_info[pool].records = record;
359 	kvp_file_info[pool].num_records++;
360 	kvp_update_file(pool);
361 	return 0;
362 }
363 
kvp_get_value(int pool,const __u8 * key,int key_size,__u8 * value,int value_size)364 static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
365 			int value_size)
366 {
367 	int i;
368 	int num_records;
369 	struct kvp_record *record;
370 
371 	if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
372 		(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
373 		return 1;
374 
375 	/*
376 	 * First update the in-memory state.
377 	 */
378 	kvp_update_mem_state(pool);
379 
380 	num_records = kvp_file_info[pool].num_records;
381 	record = kvp_file_info[pool].records;
382 
383 	for (i = 0; i < num_records; i++) {
384 		if (memcmp(key, record[i].key, key_size))
385 			continue;
386 		/*
387 		 * Found a match; just copy the value out.
388 		 */
389 		memcpy(value, record[i].value, value_size);
390 		return 0;
391 	}
392 
393 	return 1;
394 }
395 
kvp_pool_enumerate(int pool,int index,__u8 * key,int key_size,__u8 * value,int value_size)396 static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
397 				__u8 *value, int value_size)
398 {
399 	struct kvp_record *record;
400 
401 	/*
402 	 * First update our in-memory database.
403 	 */
404 	kvp_update_mem_state(pool);
405 	record = kvp_file_info[pool].records;
406 
407 	if (index >= kvp_file_info[pool].num_records) {
408 		return 1;
409 	}
410 
411 	memcpy(key, record[index].key, key_size);
412 	memcpy(value, record[index].value, value_size);
413 	return 0;
414 }
415 
416 
kvp_get_os_info(void)417 void kvp_get_os_info(void)
418 {
419 	FILE	*file;
420 	char	*p, buf[512];
421 
422 	uname(&uts_buf);
423 	os_version = uts_buf.release;
424 	os_build = strdup(uts_buf.release);
425 
426 	os_name = uts_buf.sysname;
427 	processor_arch = uts_buf.machine;
428 
429 	/*
430 	 * The current windows host (win7) expects the build
431 	 * string to be of the form: x.y.z
432 	 * Strip additional information we may have.
433 	 */
434 	p = strchr(os_version, '-');
435 	if (p)
436 		*p = '\0';
437 
438 	/*
439 	 * Parse the /etc/os-release file if present:
440 	 * https://www.freedesktop.org/software/systemd/man/os-release.html
441 	 */
442 	file = fopen("/etc/os-release", "r");
443 	if (file != NULL) {
444 		while (fgets(buf, sizeof(buf), file)) {
445 			char *value, *q;
446 
447 			/* Ignore comments */
448 			if (buf[0] == '#')
449 				continue;
450 
451 			/* Split into name=value */
452 			p = strchr(buf, '=');
453 			if (!p)
454 				continue;
455 			*p++ = 0;
456 
457 			/* Remove quotes and newline; un-escape */
458 			value = p;
459 			q = p;
460 			while (*p) {
461 				if (*p == '\\') {
462 					++p;
463 					if (!*p)
464 						break;
465 					*q++ = *p++;
466 				} else if (*p == '\'' || *p == '"' ||
467 					   *p == '\n') {
468 					++p;
469 				} else {
470 					*q++ = *p++;
471 				}
472 			}
473 			*q = 0;
474 
475 			if (!strcmp(buf, "NAME")) {
476 				p = strdup(value);
477 				if (!p)
478 					break;
479 				os_name = p;
480 			} else if (!strcmp(buf, "VERSION_ID")) {
481 				p = strdup(value);
482 				if (!p)
483 					break;
484 				os_major = p;
485 			}
486 		}
487 		fclose(file);
488 		return;
489 	}
490 
491 	/* Fallback for older RH/SUSE releases */
492 	file = fopen("/etc/SuSE-release", "r");
493 	if (file != NULL)
494 		goto kvp_osinfo_found;
495 	file  = fopen("/etc/redhat-release", "r");
496 	if (file != NULL)
497 		goto kvp_osinfo_found;
498 
499 	/*
500 	 * We don't have information about the os.
501 	 */
502 	return;
503 
504 kvp_osinfo_found:
505 	/* up to three lines */
506 	p = fgets(buf, sizeof(buf), file);
507 	if (p) {
508 		p = strchr(buf, '\n');
509 		if (p)
510 			*p = '\0';
511 		p = strdup(buf);
512 		if (!p)
513 			goto done;
514 		os_name = p;
515 
516 		/* second line */
517 		p = fgets(buf, sizeof(buf), file);
518 		if (p) {
519 			p = strchr(buf, '\n');
520 			if (p)
521 				*p = '\0';
522 			p = strdup(buf);
523 			if (!p)
524 				goto done;
525 			os_major = p;
526 
527 			/* third line */
528 			p = fgets(buf, sizeof(buf), file);
529 			if (p)  {
530 				p = strchr(buf, '\n');
531 				if (p)
532 					*p = '\0';
533 				p = strdup(buf);
534 				if (p)
535 					os_minor = p;
536 			}
537 		}
538 	}
539 
540 done:
541 	fclose(file);
542 	return;
543 }
544 
545 
546 
547 /*
548  * Retrieve an interface name corresponding to the specified guid.
549  * If there is a match, the function returns a pointer
550  * to the interface name and if not, a NULL is returned.
551  * If a match is found, the caller is responsible for
552  * freeing the memory.
553  */
554 
kvp_get_if_name(char * guid)555 static char *kvp_get_if_name(char *guid)
556 {
557 	DIR *dir;
558 	struct dirent *entry;
559 	FILE    *file;
560 	char    *p, *x;
561 	char    *if_name = NULL;
562 	char    buf[256];
563 	char dev_id[PATH_MAX];
564 
565 	dir = opendir(KVP_NET_DIR);
566 	if (dir == NULL)
567 		return NULL;
568 
569 	while ((entry = readdir(dir)) != NULL) {
570 		/*
571 		 * Set the state for the next pass.
572 		 */
573 		snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
574 			 KVP_NET_DIR, entry->d_name);
575 
576 		file = fopen(dev_id, "r");
577 		if (file == NULL)
578 			continue;
579 
580 		p = fgets(buf, sizeof(buf), file);
581 		if (p) {
582 			x = strchr(p, '\n');
583 			if (x)
584 				*x = '\0';
585 
586 			if (!strcmp(p, guid)) {
587 				/*
588 				 * Found the guid match; return the interface
589 				 * name. The caller will free the memory.
590 				 */
591 				if_name = strdup(entry->d_name);
592 				fclose(file);
593 				break;
594 			}
595 		}
596 		fclose(file);
597 	}
598 
599 	closedir(dir);
600 	return if_name;
601 }
602 
603 /*
604  * Retrieve the MAC address given the interface name.
605  */
606 
kvp_if_name_to_mac(char * if_name)607 static char *kvp_if_name_to_mac(char *if_name)
608 {
609 	FILE    *file;
610 	char    *p, *x;
611 	char    buf[256];
612 	char addr_file[PATH_MAX];
613 	unsigned int i;
614 	char *mac_addr = NULL;
615 
616 	snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
617 		 if_name, "/address");
618 
619 	file = fopen(addr_file, "r");
620 	if (file == NULL)
621 		return NULL;
622 
623 	p = fgets(buf, sizeof(buf), file);
624 	if (p) {
625 		x = strchr(p, '\n');
626 		if (x)
627 			*x = '\0';
628 		for (i = 0; i < strlen(p); i++)
629 			p[i] = toupper(p[i]);
630 		mac_addr = strdup(p);
631 	}
632 
633 	fclose(file);
634 	return mac_addr;
635 }
636 
kvp_process_ipconfig_file(char * cmd,char * config_buf,unsigned int len,int element_size,int offset)637 static void kvp_process_ipconfig_file(char *cmd,
638 					char *config_buf, unsigned int len,
639 					int element_size, int offset)
640 {
641 	char buf[256];
642 	char *p;
643 	char *x;
644 	FILE *file;
645 
646 	/*
647 	 * First execute the command.
648 	 */
649 	file = popen(cmd, "r");
650 	if (file == NULL)
651 		return;
652 
653 	if (offset == 0)
654 		memset(config_buf, 0, len);
655 	while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
656 		if (len < strlen(config_buf) + element_size + 1)
657 			break;
658 
659 		x = strchr(p, '\n');
660 		if (x)
661 			*x = '\0';
662 
663 		strcat(config_buf, p);
664 		strcat(config_buf, ";");
665 	}
666 	pclose(file);
667 }
668 
kvp_get_ipconfig_info(char * if_name,struct hv_kvp_ipaddr_value * buffer)669 static void kvp_get_ipconfig_info(char *if_name,
670 				 struct hv_kvp_ipaddr_value *buffer)
671 {
672 	char cmd[512];
673 	char dhcp_info[128];
674 	char *p;
675 	FILE *file;
676 
677 	/*
678 	 * Get the address of default gateway (ipv4).
679 	 */
680 	sprintf(cmd, "%s %s", "ip route show dev", if_name);
681 	strcat(cmd, " | awk '/default/ {print $3 }'");
682 
683 	/*
684 	 * Execute the command to gather gateway info.
685 	 */
686 	kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
687 				(MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
688 
689 	/*
690 	 * Get the address of default gateway (ipv6).
691 	 */
692 	sprintf(cmd, "%s %s", "ip -f inet6  route show dev", if_name);
693 	strcat(cmd, " | awk '/default/ {print $3 }'");
694 
695 	/*
696 	 * Execute the command to gather gateway info (ipv6).
697 	 */
698 	kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
699 				(MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
700 
701 
702 	/*
703 	 * Gather the DNS state.
704 	 * Since there is no standard way to get this information
705 	 * across various distributions of interest; we just invoke
706 	 * an external script that needs to be ported across distros
707 	 * of interest.
708 	 *
709 	 * Following is the expected format of the information from the script:
710 	 *
711 	 * ipaddr1 (nameserver1)
712 	 * ipaddr2 (nameserver2)
713 	 * .
714 	 * .
715 	 */
716 
717 	sprintf(cmd, KVP_SCRIPTS_PATH "%s",  "hv_get_dns_info");
718 
719 	/*
720 	 * Execute the command to gather DNS info.
721 	 */
722 	kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
723 				(MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
724 
725 	/*
726 	 * Gather the DHCP state.
727 	 * We will gather this state by invoking an external script.
728 	 * The parameter to the script is the interface name.
729 	 * Here is the expected output:
730 	 *
731 	 * Enabled: DHCP enabled.
732 	 */
733 
734 	sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dhcp_info", if_name);
735 
736 	file = popen(cmd, "r");
737 	if (file == NULL)
738 		return;
739 
740 	p = fgets(dhcp_info, sizeof(dhcp_info), file);
741 	if (p == NULL) {
742 		pclose(file);
743 		return;
744 	}
745 
746 	if (!strncmp(p, "Enabled", 7))
747 		buffer->dhcp_enabled = 1;
748 	else
749 		buffer->dhcp_enabled = 0;
750 
751 	pclose(file);
752 }
753 
754 
hweight32(unsigned int * w)755 static unsigned int hweight32(unsigned int *w)
756 {
757 	unsigned int res = *w - ((*w >> 1) & 0x55555555);
758 	res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
759 	res = (res + (res >> 4)) & 0x0F0F0F0F;
760 	res = res + (res >> 8);
761 	return (res + (res >> 16)) & 0x000000FF;
762 }
763 
kvp_process_ip_address(void * addrp,int family,char * buffer,int length,int * offset)764 static int kvp_process_ip_address(void *addrp,
765 				int family, char *buffer,
766 				int length,  int *offset)
767 {
768 	struct sockaddr_in *addr;
769 	struct sockaddr_in6 *addr6;
770 	int addr_length;
771 	char tmp[50];
772 	const char *str;
773 
774 	if (family == AF_INET) {
775 		addr = addrp;
776 		str = inet_ntop(family, &addr->sin_addr, tmp, 50);
777 		addr_length = INET_ADDRSTRLEN;
778 	} else {
779 		addr6 = addrp;
780 		str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
781 		addr_length = INET6_ADDRSTRLEN;
782 	}
783 
784 	if ((length - *offset) < addr_length + 2)
785 		return HV_E_FAIL;
786 	if (str == NULL) {
787 		strcpy(buffer, "inet_ntop failed\n");
788 		return HV_E_FAIL;
789 	}
790 	if (*offset == 0)
791 		strcpy(buffer, tmp);
792 	else {
793 		strcat(buffer, ";");
794 		strcat(buffer, tmp);
795 	}
796 
797 	*offset += strlen(str) + 1;
798 
799 	return 0;
800 }
801 
802 static int
kvp_get_ip_info(int family,char * if_name,int op,void * out_buffer,unsigned int length)803 kvp_get_ip_info(int family, char *if_name, int op,
804 		 void  *out_buffer, unsigned int length)
805 {
806 	struct ifaddrs *ifap;
807 	struct ifaddrs *curp;
808 	int offset = 0;
809 	int sn_offset = 0;
810 	int error = 0;
811 	char *buffer;
812 	struct hv_kvp_ipaddr_value *ip_buffer = NULL;
813 	char cidr_mask[5]; /* /xyz */
814 	int weight;
815 	int i;
816 	unsigned int *w;
817 	char *sn_str;
818 	struct sockaddr_in6 *addr6;
819 
820 	if (op == KVP_OP_ENUMERATE) {
821 		buffer = out_buffer;
822 	} else {
823 		ip_buffer = out_buffer;
824 		buffer = (char *)ip_buffer->ip_addr;
825 		ip_buffer->addr_family = 0;
826 	}
827 	/*
828 	 * On entry into this function, the buffer is capable of holding the
829 	 * maximum key value.
830 	 */
831 
832 	if (getifaddrs(&ifap)) {
833 		strcpy(buffer, "getifaddrs failed\n");
834 		return HV_E_FAIL;
835 	}
836 
837 	curp = ifap;
838 	while (curp != NULL) {
839 		if (curp->ifa_addr == NULL) {
840 			curp = curp->ifa_next;
841 			continue;
842 		}
843 
844 		if ((if_name != NULL) &&
845 			(strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
846 			/*
847 			 * We want info about a specific interface;
848 			 * just continue.
849 			 */
850 			curp = curp->ifa_next;
851 			continue;
852 		}
853 
854 		/*
855 		 * We only support two address families: AF_INET and AF_INET6.
856 		 * If a family value of 0 is specified, we collect both
857 		 * supported address families; if not we gather info on
858 		 * the specified address family.
859 		 */
860 		if ((((family != 0) &&
861 			 (curp->ifa_addr->sa_family != family))) ||
862 			 (curp->ifa_flags & IFF_LOOPBACK)) {
863 			curp = curp->ifa_next;
864 			continue;
865 		}
866 		if ((curp->ifa_addr->sa_family != AF_INET) &&
867 			(curp->ifa_addr->sa_family != AF_INET6)) {
868 			curp = curp->ifa_next;
869 			continue;
870 		}
871 
872 		if (op == KVP_OP_GET_IP_INFO) {
873 			/*
874 			 * Gather info other than the IP address.
875 			 * IP address info will be gathered later.
876 			 */
877 			if (curp->ifa_addr->sa_family == AF_INET) {
878 				ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
879 				/*
880 				 * Get subnet info.
881 				 */
882 				error = kvp_process_ip_address(
883 							     curp->ifa_netmask,
884 							     AF_INET,
885 							     (char *)
886 							     ip_buffer->sub_net,
887 							     length,
888 							     &sn_offset);
889 				if (error)
890 					goto gather_ipaddr;
891 			} else {
892 				ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
893 
894 				/*
895 				 * Get subnet info in CIDR format.
896 				 */
897 				weight = 0;
898 				sn_str = (char *)ip_buffer->sub_net;
899 				addr6 = (struct sockaddr_in6 *)
900 					curp->ifa_netmask;
901 				w = addr6->sin6_addr.s6_addr32;
902 
903 				for (i = 0; i < 4; i++)
904 					weight += hweight32(&w[i]);
905 
906 				sprintf(cidr_mask, "/%d", weight);
907 				if (length < sn_offset + strlen(cidr_mask) + 1)
908 					goto gather_ipaddr;
909 
910 				if (sn_offset == 0)
911 					strcpy(sn_str, cidr_mask);
912 				else {
913 					strcat((char *)ip_buffer->sub_net, ";");
914 					strcat(sn_str, cidr_mask);
915 				}
916 				sn_offset += strlen(sn_str) + 1;
917 			}
918 
919 			/*
920 			 * Collect other ip related configuration info.
921 			 */
922 
923 			kvp_get_ipconfig_info(if_name, ip_buffer);
924 		}
925 
926 gather_ipaddr:
927 		error = kvp_process_ip_address(curp->ifa_addr,
928 						curp->ifa_addr->sa_family,
929 						buffer,
930 						length, &offset);
931 		if (error)
932 			goto getaddr_done;
933 
934 		curp = curp->ifa_next;
935 	}
936 
937 getaddr_done:
938 	freeifaddrs(ifap);
939 	return error;
940 }
941 
942 /*
943  * Retrieve the IP given the MAC address.
944  */
kvp_mac_to_ip(struct hv_kvp_ipaddr_value * kvp_ip_val)945 static int kvp_mac_to_ip(struct hv_kvp_ipaddr_value *kvp_ip_val)
946 {
947 	char *mac = (char *)kvp_ip_val->adapter_id;
948 	DIR *dir;
949 	struct dirent *entry;
950 	FILE    *file;
951 	char    *p, *x;
952 	char    *if_name = NULL;
953 	char    buf[256];
954 	char dev_id[PATH_MAX];
955 	unsigned int i;
956 	int error = HV_E_FAIL;
957 
958 	dir = opendir(KVP_NET_DIR);
959 	if (dir == NULL)
960 		return HV_E_FAIL;
961 
962 	while ((entry = readdir(dir)) != NULL) {
963 		/*
964 		 * Set the state for the next pass.
965 		 */
966 		snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
967 			 entry->d_name);
968 
969 		file = fopen(dev_id, "r");
970 		if (file == NULL)
971 			continue;
972 
973 		p = fgets(buf, sizeof(buf), file);
974 		fclose(file);
975 		if (!p)
976 			continue;
977 
978 		x = strchr(p, '\n');
979 		if (x)
980 			*x = '\0';
981 
982 		for (i = 0; i < strlen(p); i++)
983 			p[i] = toupper(p[i]);
984 
985 		if (strcmp(p, mac))
986 			continue;
987 
988 		/*
989 		 * Found the MAC match.
990 		 * A NIC (e.g. VF) matching the MAC, but without IP, is skipped.
991 		 */
992 		if_name = entry->d_name;
993 		if (!if_name)
994 			continue;
995 
996 		error = kvp_get_ip_info(0, if_name, KVP_OP_GET_IP_INFO,
997 					kvp_ip_val, MAX_IP_ADDR_SIZE * 2);
998 
999 		if (!error && strlen((char *)kvp_ip_val->ip_addr))
1000 			break;
1001 	}
1002 
1003 	closedir(dir);
1004 	return error;
1005 }
1006 
expand_ipv6(char * addr,int type)1007 static int expand_ipv6(char *addr, int type)
1008 {
1009 	int ret;
1010 	struct in6_addr v6_addr;
1011 
1012 	ret = inet_pton(AF_INET6, addr, &v6_addr);
1013 
1014 	if (ret != 1) {
1015 		if (type == NETMASK)
1016 			return 1;
1017 		return 0;
1018 	}
1019 
1020 	sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
1021 		"%02x%02x:%02x%02x:%02x%02x",
1022 		(int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
1023 		(int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
1024 		(int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
1025 		(int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
1026 		(int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
1027 		(int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
1028 		(int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
1029 		(int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
1030 
1031 	return 1;
1032 
1033 }
1034 
is_ipv4(char * addr)1035 static int is_ipv4(char *addr)
1036 {
1037 	int ret;
1038 	struct in_addr ipv4_addr;
1039 
1040 	ret = inet_pton(AF_INET, addr, &ipv4_addr);
1041 
1042 	if (ret == 1)
1043 		return 1;
1044 	return 0;
1045 }
1046 
parse_ip_val_buffer(char * in_buf,int * offset,char * out_buf,int out_len)1047 static int parse_ip_val_buffer(char *in_buf, int *offset,
1048 				char *out_buf, int out_len)
1049 {
1050 	char *x;
1051 	char *start;
1052 
1053 	/*
1054 	 * in_buf has sequence of characters that are separated by
1055 	 * the character ';'. The last sequence does not have the
1056 	 * terminating ";" character.
1057 	 */
1058 	start = in_buf + *offset;
1059 
1060 	x = strchr(start, ';');
1061 	if (x)
1062 		*x = 0;
1063 	else
1064 		x = start + strlen(start);
1065 
1066 	if (strlen(start) != 0) {
1067 		int i = 0;
1068 		/*
1069 		 * Get rid of leading spaces.
1070 		 */
1071 		while (start[i] == ' ')
1072 			i++;
1073 
1074 		if ((x - start) <= out_len) {
1075 			strcpy(out_buf, (start + i));
1076 			*offset += (x - start) + 1;
1077 			return 1;
1078 		}
1079 	}
1080 	return 0;
1081 }
1082 
kvp_write_file(FILE * f,char * s1,char * s2,char * s3)1083 static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
1084 {
1085 	int ret;
1086 
1087 	ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
1088 
1089 	if (ret < 0)
1090 		return HV_E_FAIL;
1091 
1092 	return 0;
1093 }
1094 
1095 
process_ip_string(FILE * f,char * ip_string,int type)1096 static int process_ip_string(FILE *f, char *ip_string, int type)
1097 {
1098 	int error = 0;
1099 	char addr[INET6_ADDRSTRLEN];
1100 	int i = 0;
1101 	int j = 0;
1102 	char str[256];
1103 	char sub_str[13];
1104 	int offset = 0;
1105 
1106 	memset(addr, 0, sizeof(addr));
1107 
1108 	while (parse_ip_val_buffer(ip_string, &offset, addr,
1109 					(MAX_IP_ADDR_SIZE * 2))) {
1110 
1111 		sub_str[0] = 0;
1112 		if (is_ipv4(addr)) {
1113 			switch (type) {
1114 			case IPADDR:
1115 				snprintf(str, sizeof(str), "%s", "IPADDR");
1116 				break;
1117 			case NETMASK:
1118 				snprintf(str, sizeof(str), "%s", "NETMASK");
1119 				break;
1120 			case GATEWAY:
1121 				snprintf(str, sizeof(str), "%s", "GATEWAY");
1122 				break;
1123 			case DNS:
1124 				snprintf(str, sizeof(str), "%s", "DNS");
1125 				break;
1126 			}
1127 
1128 			if (type == DNS) {
1129 				snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1130 			} else if (type == GATEWAY && i == 0) {
1131 				++i;
1132 			} else {
1133 				snprintf(sub_str, sizeof(sub_str), "%d", i++);
1134 			}
1135 
1136 
1137 		} else if (expand_ipv6(addr, type)) {
1138 			switch (type) {
1139 			case IPADDR:
1140 				snprintf(str, sizeof(str), "%s", "IPV6ADDR");
1141 				break;
1142 			case NETMASK:
1143 				snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
1144 				break;
1145 			case GATEWAY:
1146 				snprintf(str, sizeof(str), "%s",
1147 					"IPV6_DEFAULTGW");
1148 				break;
1149 			case DNS:
1150 				snprintf(str, sizeof(str), "%s",  "DNS");
1151 				break;
1152 			}
1153 
1154 			if (type == DNS) {
1155 				snprintf(sub_str, sizeof(sub_str), "%d", ++i);
1156 			} else if (j == 0) {
1157 				++j;
1158 			} else {
1159 				snprintf(sub_str, sizeof(sub_str), "_%d", j++);
1160 			}
1161 		} else {
1162 			return  HV_INVALIDARG;
1163 		}
1164 
1165 		error = kvp_write_file(f, str, sub_str, addr);
1166 		if (error)
1167 			return error;
1168 		memset(addr, 0, sizeof(addr));
1169 	}
1170 
1171 	return 0;
1172 }
1173 
1174 /*
1175  * Only IPv4 subnet strings needs to be converted to plen
1176  * For IPv6 the subnet is already privided in plen format
1177  */
kvp_subnet_to_plen(char * subnet_addr_str)1178 static int kvp_subnet_to_plen(char *subnet_addr_str)
1179 {
1180 	int plen = 0;
1181 	struct in_addr subnet_addr4;
1182 
1183 	/*
1184 	 * Convert subnet address to binary representation
1185 	 */
1186 	if (inet_pton(AF_INET, subnet_addr_str, &subnet_addr4) == 1) {
1187 		uint32_t subnet_mask = ntohl(subnet_addr4.s_addr);
1188 
1189 		while (subnet_mask & 0x80000000) {
1190 			plen++;
1191 			subnet_mask <<= 1;
1192 		}
1193 	} else {
1194 		return -1;
1195 	}
1196 
1197 	return plen;
1198 }
1199 
process_ip_string_nm(FILE * f,char * ip_string,char * subnet,int is_ipv6)1200 static int process_ip_string_nm(FILE *f, char *ip_string, char *subnet,
1201 				int is_ipv6)
1202 {
1203 	char addr[INET6_ADDRSTRLEN];
1204 	char subnet_addr[INET6_ADDRSTRLEN];
1205 	int error, i = 0;
1206 	int ip_offset = 0, subnet_offset = 0;
1207 	int plen;
1208 
1209 	memset(addr, 0, sizeof(addr));
1210 	memset(subnet_addr, 0, sizeof(subnet_addr));
1211 
1212 	while (parse_ip_val_buffer(ip_string, &ip_offset, addr,
1213 				   (MAX_IP_ADDR_SIZE * 2)) &&
1214 				   parse_ip_val_buffer(subnet,
1215 						       &subnet_offset,
1216 						       subnet_addr,
1217 						       (MAX_IP_ADDR_SIZE *
1218 							2))) {
1219 		if (!is_ipv6)
1220 			plen = kvp_subnet_to_plen((char *)subnet_addr);
1221 		else
1222 			plen = atoi(subnet_addr);
1223 
1224 		if (plen < 0)
1225 			return plen;
1226 
1227 		error = fprintf(f, "address%d=%s/%d\n", ++i, (char *)addr,
1228 				plen);
1229 		if (error < 0)
1230 			return error;
1231 
1232 		memset(addr, 0, sizeof(addr));
1233 		memset(subnet_addr, 0, sizeof(subnet_addr));
1234 	}
1235 
1236 	return 0;
1237 }
1238 
kvp_set_ip_info(char * if_name,struct hv_kvp_ipaddr_value * new_val)1239 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
1240 {
1241 	int error = 0;
1242 	char if_filename[PATH_MAX];
1243 	char nm_filename[PATH_MAX];
1244 	FILE *ifcfg_file, *nmfile;
1245 	char cmd[PATH_MAX];
1246 	int is_ipv6 = 0;
1247 	char *mac_addr;
1248 	int str_len;
1249 
1250 	/*
1251 	 * Set the configuration for the specified interface with
1252 	 * the information provided. Since there is no standard
1253 	 * way to configure an interface, we will have an external
1254 	 * script that does the job of configuring the interface and
1255 	 * flushing the configuration.
1256 	 *
1257 	 * The parameters passed to this external script are:
1258 	 * 1. A configuration file that has the specified configuration.
1259 	 *
1260 	 * We will embed the name of the interface in the configuration
1261 	 * file: ifcfg-ethx (where ethx is the interface name).
1262 	 *
1263 	 * The information provided here may be more than what is needed
1264 	 * in a given distro to configure the interface and so are free
1265 	 * ignore information that may not be relevant.
1266 	 *
1267 	 * Here is the ifcfg format of the ip configuration file:
1268 	 *
1269 	 * HWADDR=macaddr
1270 	 * DEVICE=interface name
1271 	 * BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
1272 	 *                       or "none" if no boot-time protocol should be used)
1273 	 *
1274 	 * IPADDR0=ipaddr1
1275 	 * IPADDR1=ipaddr2
1276 	 * IPADDRx=ipaddry (where y = x + 1)
1277 	 *
1278 	 * NETMASK0=netmask1
1279 	 * NETMASKx=netmasky (where y = x + 1)
1280 	 *
1281 	 * GATEWAY=ipaddr1
1282 	 * GATEWAYx=ipaddry (where y = x + 1)
1283 	 *
1284 	 * DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
1285 	 *
1286 	 * IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
1287 	 * tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
1288 	 * IPV6NETMASK.
1289 	 *
1290 	 * Here is the keyfile format of the ip configuration file:
1291 	 *
1292 	 * [ethernet]
1293 	 * mac-address=macaddr
1294 	 * [connection]
1295 	 * interface-name=interface name
1296 	 *
1297 	 * [ipv4]
1298 	 * method=<protocol> (where <protocol> is "auto" if DHCP is configured
1299 	 *                       or "manual" if no boot-time protocol should be used)
1300 	 *
1301 	 * address1=ipaddr1/plen
1302 	 * address2=ipaddr2/plen
1303 	 *
1304 	 * gateway=gateway1;gateway2
1305 	 *
1306 	 * dns=dns1;dns2
1307 	 *
1308 	 * [ipv6]
1309 	 * address1=ipaddr1/plen
1310 	 * address2=ipaddr2/plen
1311 	 *
1312 	 * gateway=gateway1;gateway2
1313 	 *
1314 	 * dns=dns1;dns2
1315 	 *
1316 	 * The host can specify multiple ipv4 and ipv6 addresses to be
1317 	 * configured for the interface. Furthermore, the configuration
1318 	 * needs to be persistent. A subsequent GET call on the interface
1319 	 * is expected to return the configuration that is set via the SET
1320 	 * call.
1321 	 */
1322 
1323 	/*
1324 	 * We are populating both ifcfg and nmconnection files
1325 	 */
1326 	snprintf(if_filename, sizeof(if_filename), "%s%s%s", KVP_CONFIG_LOC,
1327 		 "/ifcfg-", if_name);
1328 
1329 	ifcfg_file = fopen(if_filename, "w");
1330 
1331 	if (!ifcfg_file) {
1332 		syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1333 		       errno, strerror(errno));
1334 		return HV_E_FAIL;
1335 	}
1336 
1337 	snprintf(nm_filename, sizeof(nm_filename), "%s%s%s%s", KVP_CONFIG_LOC,
1338 		 "/", if_name, ".nmconnection");
1339 
1340 	nmfile = fopen(nm_filename, "w");
1341 
1342 	if (!nmfile) {
1343 		syslog(LOG_ERR, "Failed to open config file; error: %d %s",
1344 		       errno, strerror(errno));
1345 		fclose(ifcfg_file);
1346 		return HV_E_FAIL;
1347 	}
1348 
1349 	/*
1350 	 * First write out the MAC address.
1351 	 */
1352 
1353 	mac_addr = kvp_if_name_to_mac(if_name);
1354 	if (mac_addr == NULL) {
1355 		error = HV_E_FAIL;
1356 		goto setval_error;
1357 	}
1358 
1359 	error = kvp_write_file(ifcfg_file, "HWADDR", "", mac_addr);
1360 	if (error < 0)
1361 		goto setmac_error;
1362 
1363 	error = kvp_write_file(ifcfg_file, "DEVICE", "", if_name);
1364 	if (error < 0)
1365 		goto setmac_error;
1366 
1367 	error = fprintf(nmfile, "\n[connection]\n");
1368 	if (error < 0)
1369 		goto setmac_error;
1370 
1371 	error = kvp_write_file(nmfile, "interface-name", "", if_name);
1372 	if (error)
1373 		goto setmac_error;
1374 
1375 	error = fprintf(nmfile, "\n[ethernet]\n");
1376 	if (error < 0)
1377 		goto setmac_error;
1378 
1379 	error = kvp_write_file(nmfile, "mac-address", "", mac_addr);
1380 	if (error)
1381 		goto setmac_error;
1382 
1383 	free(mac_addr);
1384 
1385 	/*
1386 	 * The dhcp_enabled flag is only for IPv4. In the case the host only
1387 	 * injects an IPv6 address, the flag is true, but we still need to
1388 	 * proceed to parse and pass the IPv6 information to the
1389 	 * disto-specific script hv_set_ifconfig.
1390 	 */
1391 
1392 	/*
1393 	 * First populate the ifcfg file format
1394 	 */
1395 	if (new_val->dhcp_enabled) {
1396 		error = kvp_write_file(ifcfg_file, "BOOTPROTO", "", "dhcp");
1397 		if (error)
1398 			goto setval_error;
1399 	} else {
1400 		error = kvp_write_file(ifcfg_file, "BOOTPROTO", "", "none");
1401 		if (error)
1402 			goto setval_error;
1403 	}
1404 
1405 	error = process_ip_string(ifcfg_file, (char *)new_val->ip_addr,
1406 				  IPADDR);
1407 	if (error)
1408 		goto setval_error;
1409 
1410 	error = process_ip_string(ifcfg_file, (char *)new_val->sub_net,
1411 				  NETMASK);
1412 	if (error)
1413 		goto setval_error;
1414 
1415 	error = process_ip_string(ifcfg_file, (char *)new_val->gate_way,
1416 				  GATEWAY);
1417 	if (error)
1418 		goto setval_error;
1419 
1420 	error = process_ip_string(ifcfg_file, (char *)new_val->dns_addr, DNS);
1421 	if (error)
1422 		goto setval_error;
1423 
1424 	if (new_val->addr_family & ADDR_FAMILY_IPV6) {
1425 		error = fprintf(nmfile, "\n[ipv6]\n");
1426 		if (error < 0)
1427 			goto setval_error;
1428 		is_ipv6 = 1;
1429 	} else {
1430 		error = fprintf(nmfile, "\n[ipv4]\n");
1431 		if (error < 0)
1432 			goto setval_error;
1433 	}
1434 
1435 	/*
1436 	 * Now we populate the keyfile format
1437 	 */
1438 
1439 	if (new_val->dhcp_enabled) {
1440 		error = kvp_write_file(nmfile, "method", "", "auto");
1441 		if (error < 0)
1442 			goto setval_error;
1443 	} else {
1444 		error = kvp_write_file(nmfile, "method", "", "manual");
1445 		if (error < 0)
1446 			goto setval_error;
1447 	}
1448 
1449 	/*
1450 	 * Write the configuration for ipaddress, netmask, gateway and
1451 	 * name services
1452 	 */
1453 	error = process_ip_string_nm(nmfile, (char *)new_val->ip_addr,
1454 				     (char *)new_val->sub_net, is_ipv6);
1455 	if (error < 0)
1456 		goto setval_error;
1457 
1458 	/* we do not want ipv4 addresses in ipv6 section and vice versa */
1459 	if (is_ipv6 != is_ipv4((char *)new_val->gate_way)) {
1460 		error = fprintf(nmfile, "gateway=%s\n", (char *)new_val->gate_way);
1461 		if (error < 0)
1462 			goto setval_error;
1463 	}
1464 
1465 	if (is_ipv6 != is_ipv4((char *)new_val->dns_addr)) {
1466 		error = fprintf(nmfile, "dns=%s\n", (char *)new_val->dns_addr);
1467 		if (error < 0)
1468 			goto setval_error;
1469 	}
1470 	fclose(nmfile);
1471 	fclose(ifcfg_file);
1472 
1473 	/*
1474 	 * Now that we have populated the configuration file,
1475 	 * invoke the external script to do its magic.
1476 	 */
1477 
1478 	str_len = snprintf(cmd, sizeof(cmd), KVP_SCRIPTS_PATH "%s %s %s",
1479 			   "hv_set_ifconfig", if_filename, nm_filename);
1480 	/*
1481 	 * This is a little overcautious, but it's necessary to suppress some
1482 	 * false warnings from gcc 8.0.1.
1483 	 */
1484 	if (str_len <= 0 || (unsigned int)str_len >= sizeof(cmd)) {
1485 		syslog(LOG_ERR, "Cmd '%s' (len=%d) may be too long",
1486 		       cmd, str_len);
1487 		return HV_E_FAIL;
1488 	}
1489 
1490 	if (system(cmd)) {
1491 		syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
1492 		       cmd, errno, strerror(errno));
1493 		return HV_E_FAIL;
1494 	}
1495 	return 0;
1496 setmac_error:
1497 	free(mac_addr);
1498 setval_error:
1499 	syslog(LOG_ERR, "Failed to write config file");
1500 	fclose(ifcfg_file);
1501 	fclose(nmfile);
1502 	return error;
1503 }
1504 
1505 
1506 static void
kvp_get_domain_name(char * buffer,int length)1507 kvp_get_domain_name(char *buffer, int length)
1508 {
1509 	struct addrinfo	hints, *info ;
1510 	int error = 0;
1511 
1512 	gethostname(buffer, length);
1513 	memset(&hints, 0, sizeof(hints));
1514 	hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
1515 	hints.ai_socktype = SOCK_STREAM;
1516 	hints.ai_flags = AI_CANONNAME;
1517 
1518 	error = getaddrinfo(buffer, NULL, &hints, &info);
1519 	if (error != 0) {
1520 		snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
1521 			error, gai_strerror(error));
1522 		return;
1523 	}
1524 	snprintf(buffer, length, "%s", info->ai_canonname);
1525 	freeaddrinfo(info);
1526 }
1527 
print_usage(char * argv[])1528 void print_usage(char *argv[])
1529 {
1530 	fprintf(stderr, "Usage: %s [options]\n"
1531 		"Options are:\n"
1532 		"  -n, --no-daemon        stay in foreground, don't daemonize\n"
1533 		"  -h, --help             print this help\n", argv[0]);
1534 }
1535 
main(int argc,char * argv[])1536 int main(int argc, char *argv[])
1537 {
1538 	int kvp_fd = -1, len;
1539 	int error;
1540 	struct pollfd pfd;
1541 	char    *p;
1542 	struct hv_kvp_msg hv_msg[1];
1543 	char	*key_value;
1544 	char	*key_name;
1545 	int	op;
1546 	int	pool;
1547 	char	*if_name;
1548 	struct hv_kvp_ipaddr_value *kvp_ip_val;
1549 	int daemonize = 1, long_index = 0, opt;
1550 
1551 	static struct option long_options[] = {
1552 		{"help",	no_argument,	   0,  'h' },
1553 		{"no-daemon",	no_argument,	   0,  'n' },
1554 		{0,		0,		   0,  0   }
1555 	};
1556 
1557 	while ((opt = getopt_long(argc, argv, "hn", long_options,
1558 				  &long_index)) != -1) {
1559 		switch (opt) {
1560 		case 'n':
1561 			daemonize = 0;
1562 			break;
1563 		case 'h':
1564 			print_usage(argv);
1565 			exit(0);
1566 		default:
1567 			print_usage(argv);
1568 			exit(EXIT_FAILURE);
1569 		}
1570 	}
1571 
1572 	if (daemonize && daemon(1, 0))
1573 		return 1;
1574 
1575 	openlog("KVP", 0, LOG_USER);
1576 	syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
1577 
1578 	/*
1579 	 * Retrieve OS release information.
1580 	 */
1581 	kvp_get_os_info();
1582 	/*
1583 	 * Cache Fully Qualified Domain Name because getaddrinfo takes an
1584 	 * unpredictable amount of time to finish.
1585 	 */
1586 	kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
1587 
1588 	if (kvp_file_init()) {
1589 		syslog(LOG_ERR, "Failed to initialize the pools");
1590 		exit(EXIT_FAILURE);
1591 	}
1592 
1593 reopen_kvp_fd:
1594 	if (kvp_fd != -1)
1595 		close(kvp_fd);
1596 	in_hand_shake = 1;
1597 	kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
1598 
1599 	if (kvp_fd < 0) {
1600 		syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
1601 		       errno, strerror(errno));
1602 		exit(EXIT_FAILURE);
1603 	}
1604 
1605 	/*
1606 	 * Register ourselves with the kernel.
1607 	 */
1608 	hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
1609 	len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1610 	if (len != sizeof(struct hv_kvp_msg)) {
1611 		syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
1612 		       errno, strerror(errno));
1613 		close(kvp_fd);
1614 		exit(EXIT_FAILURE);
1615 	}
1616 
1617 	pfd.fd = kvp_fd;
1618 
1619 	while (1) {
1620 		pfd.events = POLLIN;
1621 		pfd.revents = 0;
1622 
1623 		if (poll(&pfd, 1, -1) < 0) {
1624 			syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
1625 			if (errno == EINVAL) {
1626 				close(kvp_fd);
1627 				exit(EXIT_FAILURE);
1628 			}
1629 			else
1630 				continue;
1631 		}
1632 
1633 		len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1634 
1635 		if (len != sizeof(struct hv_kvp_msg)) {
1636 			syslog(LOG_ERR, "read failed; error:%d %s",
1637 			       errno, strerror(errno));
1638 			goto reopen_kvp_fd;
1639 		}
1640 
1641 		/*
1642 		 * We will use the KVP header information to pass back
1643 		 * the error from this daemon. So, first copy the state
1644 		 * and set the error code to success.
1645 		 */
1646 		op = hv_msg->kvp_hdr.operation;
1647 		pool = hv_msg->kvp_hdr.pool;
1648 		hv_msg->error = HV_S_OK;
1649 
1650 		if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
1651 			/*
1652 			 * Driver is registering with us; stash away the version
1653 			 * information.
1654 			 */
1655 			in_hand_shake = 0;
1656 			p = (char *)hv_msg->body.kvp_register.version;
1657 			lic_version = malloc(strlen(p) + 1);
1658 			if (lic_version) {
1659 				strcpy(lic_version, p);
1660 				syslog(LOG_INFO, "KVP LIC Version: %s",
1661 				       lic_version);
1662 			} else {
1663 				syslog(LOG_ERR, "malloc failed");
1664 			}
1665 			continue;
1666 		}
1667 
1668 		switch (op) {
1669 		case KVP_OP_GET_IP_INFO:
1670 			kvp_ip_val = &hv_msg->body.kvp_ip_val;
1671 
1672 			error = kvp_mac_to_ip(kvp_ip_val);
1673 
1674 			if (error)
1675 				hv_msg->error = error;
1676 
1677 			break;
1678 
1679 		case KVP_OP_SET_IP_INFO:
1680 			kvp_ip_val = &hv_msg->body.kvp_ip_val;
1681 			if_name = kvp_get_if_name(
1682 					(char *)kvp_ip_val->adapter_id);
1683 			if (if_name == NULL) {
1684 				/*
1685 				 * We could not map the guid to an
1686 				 * interface name; return error.
1687 				 */
1688 				hv_msg->error = HV_GUID_NOTFOUND;
1689 				break;
1690 			}
1691 			error = kvp_set_ip_info(if_name, kvp_ip_val);
1692 			if (error)
1693 				hv_msg->error = error;
1694 
1695 			free(if_name);
1696 			break;
1697 
1698 		case KVP_OP_SET:
1699 			if (kvp_key_add_or_modify(pool,
1700 					hv_msg->body.kvp_set.data.key,
1701 					hv_msg->body.kvp_set.data.key_size,
1702 					hv_msg->body.kvp_set.data.value,
1703 					hv_msg->body.kvp_set.data.value_size))
1704 					hv_msg->error = HV_S_CONT;
1705 			break;
1706 
1707 		case KVP_OP_GET:
1708 			if (kvp_get_value(pool,
1709 					hv_msg->body.kvp_set.data.key,
1710 					hv_msg->body.kvp_set.data.key_size,
1711 					hv_msg->body.kvp_set.data.value,
1712 					hv_msg->body.kvp_set.data.value_size))
1713 					hv_msg->error = HV_S_CONT;
1714 			break;
1715 
1716 		case KVP_OP_DELETE:
1717 			if (kvp_key_delete(pool,
1718 					hv_msg->body.kvp_delete.key,
1719 					hv_msg->body.kvp_delete.key_size))
1720 					hv_msg->error = HV_S_CONT;
1721 			break;
1722 
1723 		default:
1724 			break;
1725 		}
1726 
1727 		if (op != KVP_OP_ENUMERATE)
1728 			goto kvp_done;
1729 
1730 		/*
1731 		 * If the pool is KVP_POOL_AUTO, dynamically generate
1732 		 * both the key and the value; if not read from the
1733 		 * appropriate pool.
1734 		 */
1735 		if (pool != KVP_POOL_AUTO) {
1736 			if (kvp_pool_enumerate(pool,
1737 					hv_msg->body.kvp_enum_data.index,
1738 					hv_msg->body.kvp_enum_data.data.key,
1739 					HV_KVP_EXCHANGE_MAX_KEY_SIZE,
1740 					hv_msg->body.kvp_enum_data.data.value,
1741 					HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
1742 					hv_msg->error = HV_S_CONT;
1743 			goto kvp_done;
1744 		}
1745 
1746 		key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
1747 		key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
1748 
1749 		switch (hv_msg->body.kvp_enum_data.index) {
1750 		case FullyQualifiedDomainName:
1751 			strcpy(key_value, full_domain_name);
1752 			strcpy(key_name, "FullyQualifiedDomainName");
1753 			break;
1754 		case IntegrationServicesVersion:
1755 			strcpy(key_name, "IntegrationServicesVersion");
1756 			strcpy(key_value, lic_version);
1757 			break;
1758 		case NetworkAddressIPv4:
1759 			kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
1760 				key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1761 			strcpy(key_name, "NetworkAddressIPv4");
1762 			break;
1763 		case NetworkAddressIPv6:
1764 			kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
1765 				key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
1766 			strcpy(key_name, "NetworkAddressIPv6");
1767 			break;
1768 		case OSBuildNumber:
1769 			strcpy(key_value, os_build);
1770 			strcpy(key_name, "OSBuildNumber");
1771 			break;
1772 		case OSName:
1773 			strcpy(key_value, os_name);
1774 			strcpy(key_name, "OSName");
1775 			break;
1776 		case OSMajorVersion:
1777 			strcpy(key_value, os_major);
1778 			strcpy(key_name, "OSMajorVersion");
1779 			break;
1780 		case OSMinorVersion:
1781 			strcpy(key_value, os_minor);
1782 			strcpy(key_name, "OSMinorVersion");
1783 			break;
1784 		case OSVersion:
1785 			strcpy(key_value, os_version);
1786 			strcpy(key_name, "OSVersion");
1787 			break;
1788 		case ProcessorArchitecture:
1789 			strcpy(key_value, processor_arch);
1790 			strcpy(key_name, "ProcessorArchitecture");
1791 			break;
1792 		default:
1793 			hv_msg->error = HV_S_CONT;
1794 			break;
1795 		}
1796 
1797 		/*
1798 		 * Send the value back to the kernel. Note: the write() may
1799 		 * return an error due to hibernation; we can ignore the error
1800 		 * by resetting the dev file, i.e. closing and re-opening it.
1801 		 */
1802 kvp_done:
1803 		len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
1804 		if (len != sizeof(struct hv_kvp_msg)) {
1805 			syslog(LOG_ERR, "write failed; error: %d %s", errno,
1806 			       strerror(errno));
1807 			goto reopen_kvp_fd;
1808 		}
1809 	}
1810 
1811 	close(kvp_fd);
1812 	exit(0);
1813 }
1814