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-rw-r--r--tools/hv/hv_kvp_daemon.c1638
1 files changed, 1638 insertions, 0 deletions
diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
new file mode 100644
index 000000000..27f5e7dfc
--- /dev/null
+++ b/tools/hv/hv_kvp_daemon.c
@@ -0,0 +1,1638 @@
+/*
+ * 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
+ * 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:
+ * https://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 = addrp;
+ str = inet_ntop(family, &addr->sin_addr, tmp, 50);
+ addr_length = INET_ADDRSTRLEN;
+ } else {
+ addr6 = 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 17:27:33 +0000