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linux/tools/hv/hv_kvp_daemon.c
Dexuan Cui 9fc3c01a1f Tools: hv: Reopen the devices if read() or write() returns errors 
The state machine in the hv_utils driver can run out of order in some
corner cases, e.g. if the kvp daemon doesn't call write() fast enough
due to some reason, kvp_timeout_func() can run first and move the state
to HVUTIL_READY; next, when kvp_on_msg() is called it returns -EINVAL
since kvp_transaction.state is smaller than HVUTIL_USERSPACE_REQ; later,
the daemon's write() gets an error -EINVAL, and the daemon will exit().

We can reproduce the issue by sending a SIGSTOP signal to the daemon, wait
for 1 minute, and send a SIGCONT signal to the daemon: the daemon will
exit() quickly.

We can fix the issue by forcing a reset of the device (which means the
daemon can close() and open() the device again) and doing extra necessary
clean-up.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-26 22:10:10 -05:00

1639 lines
36 KiB
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/*
* An implementation of key value pair (KVP) functionality for Linux.
*
*
* Copyright (C) 2010, Novell, Inc.
* Author : K. Y. Srinivasan <ksrinivasan@novell.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <sys/poll.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <arpa/inet.h>
#include <linux/hyperv.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <syslog.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <net/if.h>
#include <limits.h>
#include <getopt.h>
/*
* KVP protocol: The user mode component first registers with the
* the kernel component. Subsequently, the kernel component requests, data
* for the specified keys. In response to this message the user mode component
* fills in the value corresponding to the specified key. We overload the
* sequence field in the cn_msg header to define our KVP message types.
*
* We use this infrastructure for also supporting queries from user mode
* application for state that may be maintained in the KVP kernel component.
*
*/
enum key_index {
FullyQualifiedDomainName = 0,
IntegrationServicesVersion, /*This key is serviced in the kernel*/
NetworkAddressIPv4,
NetworkAddressIPv6,
OSBuildNumber,
OSName,
OSMajorVersion,
OSMinorVersion,
OSVersion,
ProcessorArchitecture
};
enum {
IPADDR = 0,
NETMASK,
GATEWAY,
DNS
};
static int in_hand_shake;
static char *os_name = "";
static char *os_major = "";
static char *os_minor = "";
static char *processor_arch;
static char *os_build;
static char *os_version;
static char *lic_version = "Unknown version";
static char full_domain_name[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
static struct utsname uts_buf;
/*
* The location of the interface configuration file.
*/
#define KVP_CONFIG_LOC "/var/lib/hyperv"
#ifndef KVP_SCRIPTS_PATH
#define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
#endif
#define KVP_NET_DIR "/sys/class/net/"
#define MAX_FILE_NAME 100
#define ENTRIES_PER_BLOCK 50
struct kvp_record {
char key[HV_KVP_EXCHANGE_MAX_KEY_SIZE];
char value[HV_KVP_EXCHANGE_MAX_VALUE_SIZE];
};
struct kvp_file_state {
int fd;
int num_blocks;
struct kvp_record *records;
int num_records;
char fname[MAX_FILE_NAME];
};
static struct kvp_file_state kvp_file_info[KVP_POOL_COUNT];
static void kvp_acquire_lock(int pool)
{
struct flock fl = {F_WRLCK, SEEK_SET, 0, 0, 0};
fl.l_pid = getpid();
if (fcntl(kvp_file_info[pool].fd, F_SETLKW, &fl) == -1) {
syslog(LOG_ERR, "Failed to acquire the lock pool: %d; error: %d %s", pool,
errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
static void kvp_release_lock(int pool)
{
struct flock fl = {F_UNLCK, SEEK_SET, 0, 0, 0};
fl.l_pid = getpid();
if (fcntl(kvp_file_info[pool].fd, F_SETLK, &fl) == -1) {
syslog(LOG_ERR, "Failed to release the lock pool: %d; error: %d %s", pool,
errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
static void kvp_update_file(int pool)
{
FILE *filep;
/*
* We are going to write our in-memory registry out to
* disk; acquire the lock first.
*/
kvp_acquire_lock(pool);
filep = fopen(kvp_file_info[pool].fname, "we");
if (!filep) {
syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
errno, strerror(errno));
kvp_release_lock(pool);
exit(EXIT_FAILURE);
}
fwrite(kvp_file_info[pool].records, sizeof(struct kvp_record),
kvp_file_info[pool].num_records, filep);
if (ferror(filep) || fclose(filep)) {
kvp_release_lock(pool);
syslog(LOG_ERR, "Failed to write file, pool: %d", pool);
exit(EXIT_FAILURE);
}
kvp_release_lock(pool);
}
static void kvp_update_mem_state(int pool)
{
FILE *filep;
size_t records_read = 0;
struct kvp_record *record = kvp_file_info[pool].records;
struct kvp_record *readp;
int num_blocks = kvp_file_info[pool].num_blocks;
int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
kvp_acquire_lock(pool);
filep = fopen(kvp_file_info[pool].fname, "re");
if (!filep) {
syslog(LOG_ERR, "Failed to open file, pool: %d; error: %d %s", pool,
errno, strerror(errno));
kvp_release_lock(pool);
exit(EXIT_FAILURE);
}
for (;;) {
readp = &record[records_read];
records_read += fread(readp, sizeof(struct kvp_record),
ENTRIES_PER_BLOCK * num_blocks - records_read,
filep);
if (ferror(filep)) {
syslog(LOG_ERR,
"Failed to read file, pool: %d; error: %d %s",
pool, errno, strerror(errno));
kvp_release_lock(pool);
exit(EXIT_FAILURE);
}
if (!feof(filep)) {
/*
* We have more data to read.
*/
num_blocks++;
record = realloc(record, alloc_unit * num_blocks);
if (record == NULL) {
syslog(LOG_ERR, "malloc failed");
kvp_release_lock(pool);
exit(EXIT_FAILURE);
}
continue;
}
break;
}
kvp_file_info[pool].num_blocks = num_blocks;
kvp_file_info[pool].records = record;
kvp_file_info[pool].num_records = records_read;
fclose(filep);
kvp_release_lock(pool);
}
static int kvp_file_init(void)
{
int fd;
char *fname;
int i;
int alloc_unit = sizeof(struct kvp_record) * ENTRIES_PER_BLOCK;
if (access(KVP_CONFIG_LOC, F_OK)) {
if (mkdir(KVP_CONFIG_LOC, 0755 /* rwxr-xr-x */)) {
syslog(LOG_ERR, "Failed to create '%s'; error: %d %s", KVP_CONFIG_LOC,
errno, strerror(errno));
exit(EXIT_FAILURE);
}
}
for (i = 0; i < KVP_POOL_COUNT; i++) {
fname = kvp_file_info[i].fname;
sprintf(fname, "%s/.kvp_pool_%d", KVP_CONFIG_LOC, i);
fd = open(fname, O_RDWR | O_CREAT | O_CLOEXEC, 0644 /* rw-r--r-- */);
if (fd == -1)
return 1;
kvp_file_info[i].fd = fd;
kvp_file_info[i].num_blocks = 1;
kvp_file_info[i].records = malloc(alloc_unit);
if (kvp_file_info[i].records == NULL)
return 1;
kvp_file_info[i].num_records = 0;
kvp_update_mem_state(i);
}
return 0;
}
static int kvp_key_delete(int pool, const __u8 *key, int key_size)
{
int i;
int j, k;
int num_records;
struct kvp_record *record;
/*
* First update the in-memory state.
*/
kvp_update_mem_state(pool);
num_records = kvp_file_info[pool].num_records;
record = kvp_file_info[pool].records;
for (i = 0; i < num_records; i++) {
if (memcmp(key, record[i].key, key_size))
continue;
/*
* Found a match; just move the remaining
* entries up.
*/
if (i == (num_records - 1)) {
kvp_file_info[pool].num_records--;
kvp_update_file(pool);
return 0;
}
j = i;
k = j + 1;
for (; k < num_records; k++) {
strcpy(record[j].key, record[k].key);
strcpy(record[j].value, record[k].value);
j++;
}
kvp_file_info[pool].num_records--;
kvp_update_file(pool);
return 0;
}
return 1;
}
static int kvp_key_add_or_modify(int pool, const __u8 *key, int key_size,
const __u8 *value, int value_size)
{
int i;
int num_records;
struct kvp_record *record;
int num_blocks;
if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
return 1;
/*
* First update the in-memory state.
*/
kvp_update_mem_state(pool);
num_records = kvp_file_info[pool].num_records;
record = kvp_file_info[pool].records;
num_blocks = kvp_file_info[pool].num_blocks;
for (i = 0; i < num_records; i++) {
if (memcmp(key, record[i].key, key_size))
continue;
/*
* Found a match; just update the value -
* this is the modify case.
*/
memcpy(record[i].value, value, value_size);
kvp_update_file(pool);
return 0;
}
/*
* Need to add a new entry;
*/
if (num_records == (ENTRIES_PER_BLOCK * num_blocks)) {
/* Need to allocate a larger array for reg entries. */
record = realloc(record, sizeof(struct kvp_record) *
ENTRIES_PER_BLOCK * (num_blocks + 1));
if (record == NULL)
return 1;
kvp_file_info[pool].num_blocks++;
}
memcpy(record[i].value, value, value_size);
memcpy(record[i].key, key, key_size);
kvp_file_info[pool].records = record;
kvp_file_info[pool].num_records++;
kvp_update_file(pool);
return 0;
}
static int kvp_get_value(int pool, const __u8 *key, int key_size, __u8 *value,
int value_size)
{
int i;
int num_records;
struct kvp_record *record;
if ((key_size > HV_KVP_EXCHANGE_MAX_KEY_SIZE) ||
(value_size > HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
return 1;
/*
* First update the in-memory state.
*/
kvp_update_mem_state(pool);
num_records = kvp_file_info[pool].num_records;
record = kvp_file_info[pool].records;
for (i = 0; i < num_records; i++) {
if (memcmp(key, record[i].key, key_size))
continue;
/*
* Found a match; just copy the value out.
*/
memcpy(value, record[i].value, value_size);
return 0;
}
return 1;
}
static int kvp_pool_enumerate(int pool, int index, __u8 *key, int key_size,
__u8 *value, int value_size)
{
struct kvp_record *record;
/*
* First update our in-memory database.
*/
kvp_update_mem_state(pool);
record = kvp_file_info[pool].records;
if (index >= kvp_file_info[pool].num_records) {
return 1;
}
memcpy(key, record[index].key, key_size);
memcpy(value, record[index].value, value_size);
return 0;
}
void kvp_get_os_info(void)
{
FILE *file;
char *p, buf[512];
uname(&uts_buf);
os_version = uts_buf.release;
os_build = strdup(uts_buf.release);
os_name = uts_buf.sysname;
processor_arch = uts_buf.machine;
/*
* The current windows host (win7) expects the build
* string to be of the form: x.y.z
* Strip additional information we may have.
*/
p = strchr(os_version, '-');
if (p)
*p = '\0';
/*
* Parse the /etc/os-release file if present:
* http://www.freedesktop.org/software/systemd/man/os-release.html
*/
file = fopen("/etc/os-release", "r");
if (file != NULL) {
while (fgets(buf, sizeof(buf), file)) {
char *value, *q;
/* Ignore comments */
if (buf[0] == '#')
continue;
/* Split into name=value */
p = strchr(buf, '=');
if (!p)
continue;
*p++ = 0;
/* Remove quotes and newline; un-escape */
value = p;
q = p;
while (*p) {
if (*p == '\\') {
++p;
if (!*p)
break;
*q++ = *p++;
} else if (*p == '\'' || *p == '"' ||
*p == '\n') {
++p;
} else {
*q++ = *p++;
}
}
*q = 0;
if (!strcmp(buf, "NAME")) {
p = strdup(value);
if (!p)
break;
os_name = p;
} else if (!strcmp(buf, "VERSION_ID")) {
p = strdup(value);
if (!p)
break;
os_major = p;
}
}
fclose(file);
return;
}
/* Fallback for older RH/SUSE releases */
file = fopen("/etc/SuSE-release", "r");
if (file != NULL)
goto kvp_osinfo_found;
file = fopen("/etc/redhat-release", "r");
if (file != NULL)
goto kvp_osinfo_found;
/*
* We don't have information about the os.
*/
return;
kvp_osinfo_found:
/* up to three lines */
p = fgets(buf, sizeof(buf), file);
if (p) {
p = strchr(buf, '\n');
if (p)
*p = '\0';
p = strdup(buf);
if (!p)
goto done;
os_name = p;
/* second line */
p = fgets(buf, sizeof(buf), file);
if (p) {
p = strchr(buf, '\n');
if (p)
*p = '\0';
p = strdup(buf);
if (!p)
goto done;
os_major = p;
/* third line */
p = fgets(buf, sizeof(buf), file);
if (p) {
p = strchr(buf, '\n');
if (p)
*p = '\0';
p = strdup(buf);
if (p)
os_minor = p;
}
}
}
done:
fclose(file);
return;
}
/*
* Retrieve an interface name corresponding to the specified guid.
* If there is a match, the function returns a pointer
* to the interface name and if not, a NULL is returned.
* If a match is found, the caller is responsible for
* freeing the memory.
*/
static char *kvp_get_if_name(char *guid)
{
DIR *dir;
struct dirent *entry;
FILE *file;
char *p, *x;
char *if_name = NULL;
char buf[256];
char dev_id[PATH_MAX];
dir = opendir(KVP_NET_DIR);
if (dir == NULL)
return NULL;
while ((entry = readdir(dir)) != NULL) {
/*
* Set the state for the next pass.
*/
snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
KVP_NET_DIR, entry->d_name);
file = fopen(dev_id, "r");
if (file == NULL)
continue;
p = fgets(buf, sizeof(buf), file);
if (p) {
x = strchr(p, '\n');
if (x)
*x = '\0';
if (!strcmp(p, guid)) {
/*
* Found the guid match; return the interface
* name. The caller will free the memory.
*/
if_name = strdup(entry->d_name);
fclose(file);
break;
}
}
fclose(file);
}
closedir(dir);
return if_name;
}
/*
* Retrieve the MAC address given the interface name.
*/
static char *kvp_if_name_to_mac(char *if_name)
{
FILE *file;
char *p, *x;
char buf[256];
char addr_file[PATH_MAX];
unsigned int i;
char *mac_addr = NULL;
snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
if_name, "/address");
file = fopen(addr_file, "r");
if (file == NULL)
return NULL;
p = fgets(buf, sizeof(buf), file);
if (p) {
x = strchr(p, '\n');
if (x)
*x = '\0';
for (i = 0; i < strlen(p); i++)
p[i] = toupper(p[i]);
mac_addr = strdup(p);
}
fclose(file);
return mac_addr;
}
static void kvp_process_ipconfig_file(char *cmd,
char *config_buf, unsigned int len,
int element_size, int offset)
{
char buf[256];
char *p;
char *x;
FILE *file;
/*
* First execute the command.
*/
file = popen(cmd, "r");
if (file == NULL)
return;
if (offset == 0)
memset(config_buf, 0, len);
while ((p = fgets(buf, sizeof(buf), file)) != NULL) {
if (len < strlen(config_buf) + element_size + 1)
break;
x = strchr(p, '\n');
if (x)
*x = '\0';
strcat(config_buf, p);
strcat(config_buf, ";");
}
pclose(file);
}
static void kvp_get_ipconfig_info(char *if_name,
struct hv_kvp_ipaddr_value *buffer)
{
char cmd[512];
char dhcp_info[128];
char *p;
FILE *file;
/*
* Get the address of default gateway (ipv4).
*/
sprintf(cmd, "%s %s", "ip route show dev", if_name);
strcat(cmd, " | awk '/default/ {print $3 }'");
/*
* Execute the command to gather gateway info.
*/
kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
(MAX_GATEWAY_SIZE * 2), INET_ADDRSTRLEN, 0);
/*
* Get the address of default gateway (ipv6).
*/
sprintf(cmd, "%s %s", "ip -f inet6 route show dev", if_name);
strcat(cmd, " | awk '/default/ {print $3 }'");
/*
* Execute the command to gather gateway info (ipv6).
*/
kvp_process_ipconfig_file(cmd, (char *)buffer->gate_way,
(MAX_GATEWAY_SIZE * 2), INET6_ADDRSTRLEN, 1);
/*
* Gather the DNS state.
* Since there is no standard way to get this information
* across various distributions of interest; we just invoke
* an external script that needs to be ported across distros
* of interest.
*
* Following is the expected format of the information from the script:
*
* ipaddr1 (nameserver1)
* ipaddr2 (nameserver2)
* .
* .
*/
sprintf(cmd, KVP_SCRIPTS_PATH "%s", "hv_get_dns_info");
/*
* Execute the command to gather DNS info.
*/
kvp_process_ipconfig_file(cmd, (char *)buffer->dns_addr,
(MAX_IP_ADDR_SIZE * 2), INET_ADDRSTRLEN, 0);
/*
* Gather the DHCP state.
* We will gather this state by invoking an external script.
* The parameter to the script is the interface name.
* Here is the expected output:
*
* Enabled: DHCP enabled.
*/
sprintf(cmd, KVP_SCRIPTS_PATH "%s %s", "hv_get_dhcp_info", if_name);
file = popen(cmd, "r");
if (file == NULL)
return;
p = fgets(dhcp_info, sizeof(dhcp_info), file);
if (p == NULL) {
pclose(file);
return;
}
if (!strncmp(p, "Enabled", 7))
buffer->dhcp_enabled = 1;
else
buffer->dhcp_enabled = 0;
pclose(file);
}
static unsigned int hweight32(unsigned int *w)
{
unsigned int res = *w - ((*w >> 1) & 0x55555555);
res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
res = (res + (res >> 4)) & 0x0F0F0F0F;
res = res + (res >> 8);
return (res + (res >> 16)) & 0x000000FF;
}
static int kvp_process_ip_address(void *addrp,
int family, char *buffer,
int length, int *offset)
{
struct sockaddr_in *addr;
struct sockaddr_in6 *addr6;
int addr_length;
char tmp[50];
const char *str;
if (family == AF_INET) {
addr = (struct sockaddr_in *)addrp;
str = inet_ntop(family, &addr->sin_addr, tmp, 50);
addr_length = INET_ADDRSTRLEN;
} else {
addr6 = (struct sockaddr_in6 *)addrp;
str = inet_ntop(family, &addr6->sin6_addr.s6_addr, tmp, 50);
addr_length = INET6_ADDRSTRLEN;
}
if ((length - *offset) < addr_length + 2)
return HV_E_FAIL;
if (str == NULL) {
strcpy(buffer, "inet_ntop failed\n");
return HV_E_FAIL;
}
if (*offset == 0)
strcpy(buffer, tmp);
else {
strcat(buffer, ";");
strcat(buffer, tmp);
}
*offset += strlen(str) + 1;
return 0;
}
static int
kvp_get_ip_info(int family, char *if_name, int op,
void *out_buffer, unsigned int length)
{
struct ifaddrs *ifap;
struct ifaddrs *curp;
int offset = 0;
int sn_offset = 0;
int error = 0;
char *buffer;
struct hv_kvp_ipaddr_value *ip_buffer = NULL;
char cidr_mask[5]; /* /xyz */
int weight;
int i;
unsigned int *w;
char *sn_str;
struct sockaddr_in6 *addr6;
if (op == KVP_OP_ENUMERATE) {
buffer = out_buffer;
} else {
ip_buffer = out_buffer;
buffer = (char *)ip_buffer->ip_addr;
ip_buffer->addr_family = 0;
}
/*
* On entry into this function, the buffer is capable of holding the
* maximum key value.
*/
if (getifaddrs(&ifap)) {
strcpy(buffer, "getifaddrs failed\n");
return HV_E_FAIL;
}
curp = ifap;
while (curp != NULL) {
if (curp->ifa_addr == NULL) {
curp = curp->ifa_next;
continue;
}
if ((if_name != NULL) &&
(strncmp(curp->ifa_name, if_name, strlen(if_name)))) {
/*
* We want info about a specific interface;
* just continue.
*/
curp = curp->ifa_next;
continue;
}
/*
* We only support two address families: AF_INET and AF_INET6.
* If a family value of 0 is specified, we collect both
* supported address families; if not we gather info on
* the specified address family.
*/
if ((((family != 0) &&
(curp->ifa_addr->sa_family != family))) ||
(curp->ifa_flags & IFF_LOOPBACK)) {
curp = curp->ifa_next;
continue;
}
if ((curp->ifa_addr->sa_family != AF_INET) &&
(curp->ifa_addr->sa_family != AF_INET6)) {
curp = curp->ifa_next;
continue;
}
if (op == KVP_OP_GET_IP_INFO) {
/*
* Gather info other than the IP address.
* IP address info will be gathered later.
*/
if (curp->ifa_addr->sa_family == AF_INET) {
ip_buffer->addr_family |= ADDR_FAMILY_IPV4;
/*
* Get subnet info.
*/
error = kvp_process_ip_address(
curp->ifa_netmask,
AF_INET,
(char *)
ip_buffer->sub_net,
length,
&sn_offset);
if (error)
goto gather_ipaddr;
} else {
ip_buffer->addr_family |= ADDR_FAMILY_IPV6;
/*
* Get subnet info in CIDR format.
*/
weight = 0;
sn_str = (char *)ip_buffer->sub_net;
addr6 = (struct sockaddr_in6 *)
curp->ifa_netmask;
w = addr6->sin6_addr.s6_addr32;
for (i = 0; i < 4; i++)
weight += hweight32(&w[i]);
sprintf(cidr_mask, "/%d", weight);
if (length < sn_offset + strlen(cidr_mask) + 1)
goto gather_ipaddr;
if (sn_offset == 0)
strcpy(sn_str, cidr_mask);
else {
strcat((char *)ip_buffer->sub_net, ";");
strcat(sn_str, cidr_mask);
}
sn_offset += strlen(sn_str) + 1;
}
/*
* Collect other ip related configuration info.
*/
kvp_get_ipconfig_info(if_name, ip_buffer);
}
gather_ipaddr:
error = kvp_process_ip_address(curp->ifa_addr,
curp->ifa_addr->sa_family,
buffer,
length, &offset);
if (error)
goto getaddr_done;
curp = curp->ifa_next;
}
getaddr_done:
freeifaddrs(ifap);
return error;
}
/*
* Retrieve the IP given the MAC address.
*/
static int kvp_mac_to_ip(struct hv_kvp_ipaddr_value *kvp_ip_val)
{
char *mac = (char *)kvp_ip_val->adapter_id;
DIR *dir;
struct dirent *entry;
FILE *file;
char *p, *x;
char *if_name = NULL;
char buf[256];
char dev_id[PATH_MAX];
unsigned int i;
int error = HV_E_FAIL;
dir = opendir(KVP_NET_DIR);
if (dir == NULL)
return HV_E_FAIL;
while ((entry = readdir(dir)) != NULL) {
/*
* Set the state for the next pass.
*/
snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
entry->d_name);
file = fopen(dev_id, "r");
if (file == NULL)
continue;
p = fgets(buf, sizeof(buf), file);
fclose(file);
if (!p)
continue;
x = strchr(p, '\n');
if (x)
*x = '\0';
for (i = 0; i < strlen(p); i++)
p[i] = toupper(p[i]);
if (strcmp(p, mac))
continue;
/*
* Found the MAC match.
* A NIC (e.g. VF) matching the MAC, but without IP, is skipped.
*/
if_name = entry->d_name;
if (!if_name)
continue;
error = kvp_get_ip_info(0, if_name, KVP_OP_GET_IP_INFO,
kvp_ip_val, MAX_IP_ADDR_SIZE * 2);
if (!error && strlen((char *)kvp_ip_val->ip_addr))
break;
}
closedir(dir);
return error;
}
static int expand_ipv6(char *addr, int type)
{
int ret;
struct in6_addr v6_addr;
ret = inet_pton(AF_INET6, addr, &v6_addr);
if (ret != 1) {
if (type == NETMASK)
return 1;
return 0;
}
sprintf(addr, "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:"
"%02x%02x:%02x%02x:%02x%02x",
(int)v6_addr.s6_addr[0], (int)v6_addr.s6_addr[1],
(int)v6_addr.s6_addr[2], (int)v6_addr.s6_addr[3],
(int)v6_addr.s6_addr[4], (int)v6_addr.s6_addr[5],
(int)v6_addr.s6_addr[6], (int)v6_addr.s6_addr[7],
(int)v6_addr.s6_addr[8], (int)v6_addr.s6_addr[9],
(int)v6_addr.s6_addr[10], (int)v6_addr.s6_addr[11],
(int)v6_addr.s6_addr[12], (int)v6_addr.s6_addr[13],
(int)v6_addr.s6_addr[14], (int)v6_addr.s6_addr[15]);
return 1;
}
static int is_ipv4(char *addr)
{
int ret;
struct in_addr ipv4_addr;
ret = inet_pton(AF_INET, addr, &ipv4_addr);
if (ret == 1)
return 1;
return 0;
}
static int parse_ip_val_buffer(char *in_buf, int *offset,
char *out_buf, int out_len)
{
char *x;
char *start;
/*
* in_buf has sequence of characters that are separated by
* the character ';'. The last sequence does not have the
* terminating ";" character.
*/
start = in_buf + *offset;
x = strchr(start, ';');
if (x)
*x = 0;
else
x = start + strlen(start);
if (strlen(start) != 0) {
int i = 0;
/*
* Get rid of leading spaces.
*/
while (start[i] == ' ')
i++;
if ((x - start) <= out_len) {
strcpy(out_buf, (start + i));
*offset += (x - start) + 1;
return 1;
}
}
return 0;
}
static int kvp_write_file(FILE *f, char *s1, char *s2, char *s3)
{
int ret;
ret = fprintf(f, "%s%s%s%s\n", s1, s2, "=", s3);
if (ret < 0)
return HV_E_FAIL;
return 0;
}
static int process_ip_string(FILE *f, char *ip_string, int type)
{
int error = 0;
char addr[INET6_ADDRSTRLEN];
int i = 0;
int j = 0;
char str[256];
char sub_str[13];
int offset = 0;
memset(addr, 0, sizeof(addr));
while (parse_ip_val_buffer(ip_string, &offset, addr,
(MAX_IP_ADDR_SIZE * 2))) {
sub_str[0] = 0;
if (is_ipv4(addr)) {
switch (type) {
case IPADDR:
snprintf(str, sizeof(str), "%s", "IPADDR");
break;
case NETMASK:
snprintf(str, sizeof(str), "%s", "NETMASK");
break;
case GATEWAY:
snprintf(str, sizeof(str), "%s", "GATEWAY");
break;
case DNS:
snprintf(str, sizeof(str), "%s", "DNS");
break;
}
if (type == DNS) {
snprintf(sub_str, sizeof(sub_str), "%d", ++i);
} else if (type == GATEWAY && i == 0) {
++i;
} else {
snprintf(sub_str, sizeof(sub_str), "%d", i++);
}
} else if (expand_ipv6(addr, type)) {
switch (type) {
case IPADDR:
snprintf(str, sizeof(str), "%s", "IPV6ADDR");
break;
case NETMASK:
snprintf(str, sizeof(str), "%s", "IPV6NETMASK");
break;
case GATEWAY:
snprintf(str, sizeof(str), "%s",
"IPV6_DEFAULTGW");
break;
case DNS:
snprintf(str, sizeof(str), "%s", "DNS");
break;
}
if (type == DNS) {
snprintf(sub_str, sizeof(sub_str), "%d", ++i);
} else if (j == 0) {
++j;
} else {
snprintf(sub_str, sizeof(sub_str), "_%d", j++);
}
} else {
return HV_INVALIDARG;
}
error = kvp_write_file(f, str, sub_str, addr);
if (error)
return error;
memset(addr, 0, sizeof(addr));
}
return 0;
}
static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
{
int error = 0;
char if_file[PATH_MAX];
FILE *file;
char cmd[PATH_MAX];
char *mac_addr;
int str_len;
/*
* Set the configuration for the specified interface with
* the information provided. Since there is no standard
* way to configure an interface, we will have an external
* script that does the job of configuring the interface and
* flushing the configuration.
*
* The parameters passed to this external script are:
* 1. A configuration file that has the specified configuration.
*
* We will embed the name of the interface in the configuration
* file: ifcfg-ethx (where ethx is the interface name).
*
* The information provided here may be more than what is needed
* in a given distro to configure the interface and so are free
* ignore information that may not be relevant.
*
* Here is the format of the ip configuration file:
*
* HWADDR=macaddr
* DEVICE=interface name
* BOOTPROTO=<protocol> (where <protocol> is "dhcp" if DHCP is configured
* or "none" if no boot-time protocol should be used)
*
* IPADDR0=ipaddr1
* IPADDR1=ipaddr2
* IPADDRx=ipaddry (where y = x + 1)
*
* NETMASK0=netmask1
* NETMASKx=netmasky (where y = x + 1)
*
* GATEWAY=ipaddr1
* GATEWAYx=ipaddry (where y = x + 1)
*
* DNSx=ipaddrx (where first DNS address is tagged as DNS1 etc)
*
* IPV6 addresses will be tagged as IPV6ADDR, IPV6 gateway will be
* tagged as IPV6_DEFAULTGW and IPV6 NETMASK will be tagged as
* IPV6NETMASK.
*
* The host can specify multiple ipv4 and ipv6 addresses to be
* configured for the interface. Furthermore, the configuration
* needs to be persistent. A subsequent GET call on the interface
* is expected to return the configuration that is set via the SET
* call.
*/
snprintf(if_file, sizeof(if_file), "%s%s%s", KVP_CONFIG_LOC,
"/ifcfg-", if_name);
file = fopen(if_file, "w");
if (file == NULL) {
syslog(LOG_ERR, "Failed to open config file; error: %d %s",
errno, strerror(errno));
return HV_E_FAIL;
}
/*
* First write out the MAC address.
*/
mac_addr = kvp_if_name_to_mac(if_name);
if (mac_addr == NULL) {
error = HV_E_FAIL;
goto setval_error;
}
error = kvp_write_file(file, "HWADDR", "", mac_addr);
free(mac_addr);
if (error)
goto setval_error;
error = kvp_write_file(file, "DEVICE", "", if_name);
if (error)
goto setval_error;
/*
* The dhcp_enabled flag is only for IPv4. In the case the host only
* injects an IPv6 address, the flag is true, but we still need to
* proceed to parse and pass the IPv6 information to the
* disto-specific script hv_set_ifconfig.
*/
if (new_val->dhcp_enabled) {
error = kvp_write_file(file, "BOOTPROTO", "", "dhcp");
if (error)
goto setval_error;
} else {
error = kvp_write_file(file, "BOOTPROTO", "", "none");
if (error)
goto setval_error;
}
/*
* Write the configuration for ipaddress, netmask, gateway and
* name servers.
*/
error = process_ip_string(file, (char *)new_val->ip_addr, IPADDR);
if (error)
goto setval_error;
error = process_ip_string(file, (char *)new_val->sub_net, NETMASK);
if (error)
goto setval_error;
error = process_ip_string(file, (char *)new_val->gate_way, GATEWAY);
if (error)
goto setval_error;
error = process_ip_string(file, (char *)new_val->dns_addr, DNS);
if (error)
goto setval_error;
fclose(file);
/*
* Now that we have populated the configuration file,
* invoke the external script to do its magic.
*/
str_len = snprintf(cmd, sizeof(cmd), KVP_SCRIPTS_PATH "%s %s",
"hv_set_ifconfig", if_file);
/*
* This is a little overcautious, but it's necessary to suppress some
* false warnings from gcc 8.0.1.
*/
if (str_len <= 0 || (unsigned int)str_len >= sizeof(cmd)) {
syslog(LOG_ERR, "Cmd '%s' (len=%d) may be too long",
cmd, str_len);
return HV_E_FAIL;
}
if (system(cmd)) {
syslog(LOG_ERR, "Failed to execute cmd '%s'; error: %d %s",
cmd, errno, strerror(errno));
return HV_E_FAIL;
}
return 0;
setval_error:
syslog(LOG_ERR, "Failed to write config file");
fclose(file);
return error;
}
static void
kvp_get_domain_name(char *buffer, int length)
{
struct addrinfo hints, *info ;
int error = 0;
gethostname(buffer, length);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET; /*Get only ipv4 addrinfo. */
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
error = getaddrinfo(buffer, NULL, &hints, &info);
if (error != 0) {
snprintf(buffer, length, "getaddrinfo failed: 0x%x %s",
error, gai_strerror(error));
return;
}
snprintf(buffer, length, "%s", info->ai_canonname);
freeaddrinfo(info);
}
void print_usage(char *argv[])
{
fprintf(stderr, "Usage: %s [options]\n"
"Options are:\n"
" -n, --no-daemon stay in foreground, don't daemonize\n"
" -h, --help print this help\n", argv[0]);
}
int main(int argc, char *argv[])
{
int kvp_fd = -1, len;
int error;
struct pollfd pfd;
char *p;
struct hv_kvp_msg hv_msg[1];
char *key_value;
char *key_name;
int op;
int pool;
char *if_name;
struct hv_kvp_ipaddr_value *kvp_ip_val;
int daemonize = 1, long_index = 0, opt;
static struct option long_options[] = {
{"help", no_argument, 0, 'h' },
{"no-daemon", no_argument, 0, 'n' },
{0, 0, 0, 0 }
};
while ((opt = getopt_long(argc, argv, "hn", long_options,
&long_index)) != -1) {
switch (opt) {
case 'n':
daemonize = 0;
break;
case 'h':
print_usage(argv);
exit(0);
default:
print_usage(argv);
exit(EXIT_FAILURE);
}
}
if (daemonize && daemon(1, 0))
return 1;
openlog("KVP", 0, LOG_USER);
syslog(LOG_INFO, "KVP starting; pid is:%d", getpid());
/*
* Retrieve OS release information.
*/
kvp_get_os_info();
/*
* Cache Fully Qualified Domain Name because getaddrinfo takes an
* unpredictable amount of time to finish.
*/
kvp_get_domain_name(full_domain_name, sizeof(full_domain_name));
if (kvp_file_init()) {
syslog(LOG_ERR, "Failed to initialize the pools");
exit(EXIT_FAILURE);
}
reopen_kvp_fd:
if (kvp_fd != -1)
close(kvp_fd);
in_hand_shake = 1;
kvp_fd = open("/dev/vmbus/hv_kvp", O_RDWR | O_CLOEXEC);
if (kvp_fd < 0) {
syslog(LOG_ERR, "open /dev/vmbus/hv_kvp failed; error: %d %s",
errno, strerror(errno));
exit(EXIT_FAILURE);
}
/*
* Register ourselves with the kernel.
*/
hv_msg->kvp_hdr.operation = KVP_OP_REGISTER1;
len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "registration to kernel failed; error: %d %s",
errno, strerror(errno));
close(kvp_fd);
exit(EXIT_FAILURE);
}
pfd.fd = kvp_fd;
while (1) {
pfd.events = POLLIN;
pfd.revents = 0;
if (poll(&pfd, 1, -1) < 0) {
syslog(LOG_ERR, "poll failed; error: %d %s", errno, strerror(errno));
if (errno == EINVAL) {
close(kvp_fd);
exit(EXIT_FAILURE);
}
else
continue;
}
len = read(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "read failed; error:%d %s",
errno, strerror(errno));
goto reopen_kvp_fd;
}
/*
* We will use the KVP header information to pass back
* the error from this daemon. So, first copy the state
* and set the error code to success.
*/
op = hv_msg->kvp_hdr.operation;
pool = hv_msg->kvp_hdr.pool;
hv_msg->error = HV_S_OK;
if ((in_hand_shake) && (op == KVP_OP_REGISTER1)) {
/*
* Driver is registering with us; stash away the version
* information.
*/
in_hand_shake = 0;
p = (char *)hv_msg->body.kvp_register.version;
lic_version = malloc(strlen(p) + 1);
if (lic_version) {
strcpy(lic_version, p);
syslog(LOG_INFO, "KVP LIC Version: %s",
lic_version);
} else {
syslog(LOG_ERR, "malloc failed");
}
continue;
}
switch (op) {
case KVP_OP_GET_IP_INFO:
kvp_ip_val = &hv_msg->body.kvp_ip_val;
error = kvp_mac_to_ip(kvp_ip_val);
if (error)
hv_msg->error = error;
break;
case KVP_OP_SET_IP_INFO:
kvp_ip_val = &hv_msg->body.kvp_ip_val;
if_name = kvp_get_if_name(
(char *)kvp_ip_val->adapter_id);
if (if_name == NULL) {
/*
* We could not map the guid to an
* interface name; return error.
*/
hv_msg->error = HV_GUID_NOTFOUND;
break;
}
error = kvp_set_ip_info(if_name, kvp_ip_val);
if (error)
hv_msg->error = error;
free(if_name);
break;
case KVP_OP_SET:
if (kvp_key_add_or_modify(pool,
hv_msg->body.kvp_set.data.key,
hv_msg->body.kvp_set.data.key_size,
hv_msg->body.kvp_set.data.value,
hv_msg->body.kvp_set.data.value_size))
hv_msg->error = HV_S_CONT;
break;
case KVP_OP_GET:
if (kvp_get_value(pool,
hv_msg->body.kvp_set.data.key,
hv_msg->body.kvp_set.data.key_size,
hv_msg->body.kvp_set.data.value,
hv_msg->body.kvp_set.data.value_size))
hv_msg->error = HV_S_CONT;
break;
case KVP_OP_DELETE:
if (kvp_key_delete(pool,
hv_msg->body.kvp_delete.key,
hv_msg->body.kvp_delete.key_size))
hv_msg->error = HV_S_CONT;
break;
default:
break;
}
if (op != KVP_OP_ENUMERATE)
goto kvp_done;
/*
* If the pool is KVP_POOL_AUTO, dynamically generate
* both the key and the value; if not read from the
* appropriate pool.
*/
if (pool != KVP_POOL_AUTO) {
if (kvp_pool_enumerate(pool,
hv_msg->body.kvp_enum_data.index,
hv_msg->body.kvp_enum_data.data.key,
HV_KVP_EXCHANGE_MAX_KEY_SIZE,
hv_msg->body.kvp_enum_data.data.value,
HV_KVP_EXCHANGE_MAX_VALUE_SIZE))
hv_msg->error = HV_S_CONT;
goto kvp_done;
}
key_name = (char *)hv_msg->body.kvp_enum_data.data.key;
key_value = (char *)hv_msg->body.kvp_enum_data.data.value;
switch (hv_msg->body.kvp_enum_data.index) {
case FullyQualifiedDomainName:
strcpy(key_value, full_domain_name);
strcpy(key_name, "FullyQualifiedDomainName");
break;
case IntegrationServicesVersion:
strcpy(key_name, "IntegrationServicesVersion");
strcpy(key_value, lic_version);
break;
case NetworkAddressIPv4:
kvp_get_ip_info(AF_INET, NULL, KVP_OP_ENUMERATE,
key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
strcpy(key_name, "NetworkAddressIPv4");
break;
case NetworkAddressIPv6:
kvp_get_ip_info(AF_INET6, NULL, KVP_OP_ENUMERATE,
key_value, HV_KVP_EXCHANGE_MAX_VALUE_SIZE);
strcpy(key_name, "NetworkAddressIPv6");
break;
case OSBuildNumber:
strcpy(key_value, os_build);
strcpy(key_name, "OSBuildNumber");
break;
case OSName:
strcpy(key_value, os_name);
strcpy(key_name, "OSName");
break;
case OSMajorVersion:
strcpy(key_value, os_major);
strcpy(key_name, "OSMajorVersion");
break;
case OSMinorVersion:
strcpy(key_value, os_minor);
strcpy(key_name, "OSMinorVersion");
break;
case OSVersion:
strcpy(key_value, os_version);
strcpy(key_name, "OSVersion");
break;
case ProcessorArchitecture:
strcpy(key_value, processor_arch);
strcpy(key_name, "ProcessorArchitecture");
break;
default:
hv_msg->error = HV_S_CONT;
break;
}
/*
* Send the value back to the kernel. Note: the write() may
* return an error due to hibernation; we can ignore the error
* by resetting the dev file, i.e. closing and re-opening it.
*/
kvp_done:
len = write(kvp_fd, hv_msg, sizeof(struct hv_kvp_msg));
if (len != sizeof(struct hv_kvp_msg)) {
syslog(LOG_ERR, "write failed; error: %d %s", errno,
strerror(errno));
goto reopen_kvp_fd;
}
}
close(kvp_fd);
exit(0);
}
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