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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /*
  * 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);
 }

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