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util_sock.c

/*
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Tim Potter      2000-2001
   Copyright (C) Jeremy Allison  1992-2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   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.  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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

/****************************************************************************
 Return true if a string could be an IPv4 address.
****************************************************************************/

bool is_ipaddress_v4(const char *str)
{
      int ret = -1;
      struct in_addr dest;

      ret = inet_pton(AF_INET, str, &dest);
      if (ret > 0) {
            return true;
      }
      return false;
}

/****************************************************************************
 Return true if a string could be an IPv4 or IPv6 address.
****************************************************************************/

bool is_ipaddress(const char *str)
{
      int ret = -1;

#if defined(HAVE_IPV6)
      if (strchr_m(str, ':')) {
            char addr[INET6_ADDRSTRLEN];
            struct in6_addr dest6;
            const char *sp = str;
            char *p = strchr_m(str, '%');

            /*
             * Cope with link-local.
             * This is IP:v6:addr%ifname.
             */

            if (p && (p > str) && (if_nametoindex(p+1) != 0)) {
                  strlcpy(addr, str,
                        MIN(PTR_DIFF(p,str)+1,
                              sizeof(addr)));
                  sp = addr;
            }
            ret = inet_pton(AF_INET6, addr, &dest6);
            if (ret > 0) {
                  return true;
            }
      }
#endif
      return is_ipaddress_v4(str);
}

/****************************************************************************
 Is a sockaddr_storage a broadcast address ?
****************************************************************************/

bool is_broadcast_addr(const struct sockaddr_storage *pss)
{
#if defined(HAVE_IPV6)
      if (pss->ss_family == AF_INET6) {
            const struct in6_addr *sin6 =
                  &((const struct sockaddr_in6 *)pss)->sin6_addr;
            return IN6_IS_ADDR_MULTICAST(sin6);
      }
#endif
      if (pss->ss_family == AF_INET) {
            uint32_t addr =
            ntohl(((const struct sockaddr_in *)pss)->sin_addr.s_addr);
            return addr == INADDR_BROADCAST;
      }
      return false;
}

/*******************************************************************
 Wrap getaddrinfo...
******************************************************************/

static bool interpret_string_addr_internal(struct addrinfo **ppres,
                              const char *str, int flags)
{
      int ret;
      struct addrinfo hints;

      memset(&hints, '\0', sizeof(hints));
      /* By default make sure it supports TCP. */
      hints.ai_socktype = SOCK_STREAM;
      hints.ai_flags = flags;

      ret = getaddrinfo(str, NULL,
                  &hints,
                  ppres);
      if (ret) {
            DEBUG(3,("interpret_string_addr_internal: getaddrinfo failed "
                  "for name %s [%s]\n",
                  str,
                  gai_strerror(ret) ));
            return false;
      }
      return true;
}

/****************************************************************************
 Interpret an internet address or name into an IP address in 4 byte form.
 RETURNS IN NETWORK BYTE ORDER (big endian).
****************************************************************************/

uint32 interpret_addr(const char *str)
{
      uint32 ret;

      /* If it's in the form of an IP address then
       * get the lib to interpret it */
      if (is_ipaddress_v4(str)) {
            struct in_addr dest;

            if (inet_pton(AF_INET, str, &dest) <= 0) {
                  /* Error - this shouldn't happen ! */
                  DEBUG(0,("interpret_addr: inet_pton failed "
                        "host %s\n",
                        str));
                  return 0;
            }
            ret = dest.s_addr; /* NETWORK BYTE ORDER ! */
      } else {
            /* Otherwise assume it's a network name of some sort and use
                  getadddrinfo. */
            struct addrinfo *res = NULL;
            struct addrinfo *res_list = NULL;
            if (!interpret_string_addr_internal(&res_list,
                              str,
#ifdef AI_ADDRCONFIG
                              AI_ADDRCONFIG)) {
#else
                              0)) {
#endif
                  DEBUG(3,("interpret_addr: Unknown host. %s\n",str));
                  return 0;
            }

            /* Find the first IPv4 address. */
            for (res = res_list; res; res = res->ai_next) {
                  if (res->ai_family != AF_INET) {
                        continue;
                  }
                  if (res->ai_addr == NULL) {
                        continue;
                  }
                  break;
            }
            if(res == NULL) {
                  DEBUG(3,("interpret_addr: host address is "
                        "invalid for host %s\n",str));
                  if (res_list) {
                        freeaddrinfo(res_list);
                  }
                  return 0;
            }
            putip((char *)&ret,
                  &((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr);
            if (res_list) {
                  freeaddrinfo(res_list);
            }
      }

      /* This is so bogus - all callers need fixing... JRA. */
      if (ret == (uint32)-1) {
            return 0;
      }

      return ret;
}

/*******************************************************************
 A convenient addition to interpret_addr().
******************************************************************/

struct in_addr *interpret_addr2(struct in_addr *ip, const char *str)
{
      uint32 a = interpret_addr(str);
      ip->s_addr = a;
      return ip;
}

/*******************************************************************
 Map a text hostname or IP address (IPv4 or IPv6) into a
 struct sockaddr_storage.
******************************************************************/

bool interpret_string_addr(struct sockaddr_storage *pss,
            const char *str,
            int flags)
{
      char addr[INET6_ADDRSTRLEN];
      struct addrinfo *res = NULL;
#if defined(HAVE_IPV6)
      unsigned int scope_id = 0;

      if (strchr_m(str, ':')) {
            char *p = strchr_m(str, '%');

            /*
             * Cope with link-local.
             * This is IP:v6:addr%ifname.
             */

            if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
                  strlcpy(addr, str,
                        MIN(PTR_DIFF(p,str)+1,
                              sizeof(addr)));
                  str = addr;
            }
      }
#endif

      zero_addr(pss);
#ifdef AI_ADDRCONFIG
      if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
#else
      if (!interpret_string_addr_internal(&res, str, flags)) {
#endif
            return false;
      }
      if (!res) {
            return false;
      }
      /* Copy the first sockaddr. */
      memcpy(pss, res->ai_addr, res->ai_addrlen);

#if defined(HAVE_IPV6)
      if (pss->ss_family == AF_INET6 && scope_id) {
            struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
            if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
                        ps6->sin6_scope_id == 0) {
                  ps6->sin6_scope_id = scope_id;
            }
      }
#endif

      freeaddrinfo(res);
      return true;
}

/*******************************************************************
 Check if an IPv7 is 127.0.0.1
******************************************************************/

bool is_loopback_ip_v4(struct in_addr ip)
{
      struct in_addr a;
      a.s_addr = htonl(INADDR_LOOPBACK);
      return(ip.s_addr == a.s_addr);
}

/*******************************************************************
 Check if a struct sockaddr_storage is the loopback address.
******************************************************************/

bool is_loopback_addr(const struct sockaddr_storage *pss)
{
#if defined(HAVE_IPV6)
      if (pss->ss_family == AF_INET6) {
            struct in6_addr *pin6 =
                  &((struct sockaddr_in6 *)pss)->sin6_addr;
            return IN6_IS_ADDR_LOOPBACK(pin6);
      }
#endif
      if (pss->ss_family == AF_INET) {
            struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
            return is_loopback_ip_v4(*pin);
      }
      return false;
}

/*******************************************************************
 Check if an IPv4 is 0.0.0.0.
******************************************************************/

bool is_zero_ip_v4(struct in_addr ip)
{
      uint32 a;
      putip((char *)&a,(char *)&ip);
      return(a == 0);
}

/*******************************************************************
 Check if a struct sockaddr_storage has an unspecified address.
******************************************************************/

bool is_zero_addr(const struct sockaddr_storage *pss)
{
#if defined(HAVE_IPV6)
      if (pss->ss_family == AF_INET6) {
            struct in6_addr *pin6 =
                  &((struct sockaddr_in6 *)pss)->sin6_addr;
            return IN6_IS_ADDR_UNSPECIFIED(pin6);
      }
#endif
      if (pss->ss_family == AF_INET) {
            struct in_addr *pin = &((struct sockaddr_in *)pss)->sin_addr;
            return is_zero_ip_v4(*pin);
      }
      return false;
}

/*******************************************************************
 Set an IP to 0.0.0.0.
******************************************************************/

void zero_ip_v4(struct in_addr *ip)
{
      memset(ip, '\0', sizeof(struct in_addr));
}

/*******************************************************************
 Set an address to INADDR_ANY.
******************************************************************/

void zero_addr(struct sockaddr_storage *pss)
{
      memset(pss, '\0', sizeof(*pss));
      /* Ensure we're at least a valid sockaddr-storage. */
      pss->ss_family = AF_INET;
}

/*******************************************************************
 Are two IPs on the same subnet - IPv4 version ?
********************************************************************/

bool same_net_v4(struct in_addr ip1,struct in_addr ip2,struct in_addr mask)
{
      uint32 net1,net2,nmask;

      nmask = ntohl(mask.s_addr);
      net1  = ntohl(ip1.s_addr);
      net2  = ntohl(ip2.s_addr);

      return((net1 & nmask) == (net2 & nmask));
}

/*******************************************************************
 Convert an IPv4 struct in_addr to a struct sockaddr_storage.
********************************************************************/

void in_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
            struct in_addr ip)
{
      struct sockaddr_in *sa = (struct sockaddr_in *)ss;
      memset(ss, '\0', sizeof(*ss));
      ss->ss_family = AF_INET;
      sa->sin_addr = ip;
}

#if defined(HAVE_IPV6)
/*******************************************************************
 Convert an IPv6 struct in_addr to a struct sockaddr_storage.
********************************************************************/

void in6_addr_to_sockaddr_storage(struct sockaddr_storage *ss,
            struct in6_addr ip)
{
      struct sockaddr_in6 *sa = (struct sockaddr_in6 *)ss;
      memset(ss, '\0', sizeof(*ss));
      ss->ss_family = AF_INET6;
      sa->sin6_addr = ip;
}
#endif

/*******************************************************************
 Are two IPs on the same subnet?
********************************************************************/

bool same_net(const struct sockaddr_storage *ip1,
            const struct sockaddr_storage *ip2,
            const struct sockaddr_storage *mask)
{
      if (ip1->ss_family != ip2->ss_family) {
            /* Never on the same net. */
            return false;
      }

#if defined(HAVE_IPV6)
      if (ip1->ss_family == AF_INET6) {
            struct sockaddr_in6 ip1_6 = *(struct sockaddr_in6 *)ip1;
            struct sockaddr_in6 ip2_6 = *(struct sockaddr_in6 *)ip2;
            struct sockaddr_in6 mask_6 = *(struct sockaddr_in6 *)mask;
            char *p1 = (char *)&ip1_6.sin6_addr;
            char *p2 = (char *)&ip2_6.sin6_addr;
            char *m = (char *)&mask_6.sin6_addr;
            int i;

            for (i = 0; i < sizeof(struct in6_addr); i++) {
                  *p1++ &= *m;
                  *p2++ &= *m;
                  m++;
            }
            return (memcmp(&ip1_6.sin6_addr,
                        &ip2_6.sin6_addr,
                        sizeof(struct in6_addr)) == 0);
      }
#endif
      if (ip1->ss_family == AF_INET) {
            return same_net_v4(((const struct sockaddr_in *)ip1)->sin_addr,
                        ((const struct sockaddr_in *)ip2)->sin_addr,
                        ((const struct sockaddr_in *)mask)->sin_addr);
      }
      return false;
}

/*******************************************************************
 Are two sockaddr_storage's the same family and address ? Ignore port etc.
********************************************************************/

bool addr_equal(const struct sockaddr_storage *ip1,
            const struct sockaddr_storage *ip2)
{
      if (ip1->ss_family != ip2->ss_family) {
            /* Never the same. */
            return false;
      }

#if defined(HAVE_IPV6)
      if (ip1->ss_family == AF_INET6) {
            return (memcmp(&((const struct sockaddr_in6 *)ip1)->sin6_addr,
                        &((const struct sockaddr_in6 *)ip2)->sin6_addr,
                        sizeof(struct in6_addr)) == 0);
      }
#endif
      if (ip1->ss_family == AF_INET) {
            return (memcmp(&((const struct sockaddr_in *)ip1)->sin_addr,
                        &((const struct sockaddr_in *)ip2)->sin_addr,
                        sizeof(struct in_addr)) == 0);
      }
      return false;
}

/****************************************************************************
 Is an IP address the INADDR_ANY or in6addr_any value ?
****************************************************************************/

bool is_address_any(const struct sockaddr_storage *psa)
{
#if defined(HAVE_IPV6)
      if (psa->ss_family == AF_INET6) {
            struct sockaddr_in6 *si6 = (struct sockaddr_in6 *)psa;
            if (memcmp(&in6addr_any,
                        &si6->sin6_addr,
                        sizeof(in6addr_any)) == 0) {
                  return true;
            }
            return false;
      }
#endif
      if (psa->ss_family == AF_INET) {
            struct sockaddr_in *si = (struct sockaddr_in *)psa;
            if (si->sin_addr.s_addr == INADDR_ANY) {
                  return true;
            }
            return false;
      }
      return false;
}

/****************************************************************************
 Get a port number in host byte order from a sockaddr_storage.
****************************************************************************/

uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
{
      uint16_t port = 0;

      if (pss->ss_family != AF_INET) {
#if defined(HAVE_IPV6)
            /* IPv6 */
            const struct sockaddr_in6 *sa6 =
                  (const struct sockaddr_in6 *)pss;
            port = ntohs(sa6->sin6_port);
#endif
      } else {
            const struct sockaddr_in *sa =
                  (const struct sockaddr_in *)pss;
            port = ntohs(sa->sin_port);
      }
      return port;
}

/****************************************************************************
 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

static char *print_sockaddr_len(char *dest,
                  size_t destlen,
                  const struct sockaddr_storage *psa,
                  socklen_t psalen)
{
      if (destlen > 0) {
            dest[0] = '\0';
      }
      (void)sys_getnameinfo((const struct sockaddr *)psa,
                  psalen,
                  dest, destlen,
                  NULL, 0,
                  NI_NUMERICHOST);
      return dest;
}

/****************************************************************************
 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

char *print_sockaddr(char *dest,
                  size_t destlen,
                  const struct sockaddr_storage *psa)
{
      return print_sockaddr_len(dest, destlen, psa,
                  sizeof(struct sockaddr_storage));
}

/****************************************************************************
 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

char *print_canonical_sockaddr(TALLOC_CTX *ctx,
                  const struct sockaddr_storage *pss)
{
      char addr[INET6_ADDRSTRLEN];
      char *dest = NULL;
      int ret;

      ret = sys_getnameinfo((const struct sockaddr *)pss,
                  sizeof(struct sockaddr_storage),
                  addr, sizeof(addr),
                  NULL, 0,
                  NI_NUMERICHOST);
      if (ret) {
            return NULL;
      }
      if (pss->ss_family != AF_INET) {
#if defined(HAVE_IPV6)
            /* IPv6 */
            const struct sockaddr_in6 *sa6 =
                  (const struct sockaddr_in6 *)pss;
            uint16_t port = ntohs(sa6->sin6_port);

            if (port) {
                  dest = talloc_asprintf(ctx,
                              "[%s]:%d",
                              addr,
                              (unsigned int)port);
            } else {
                  dest = talloc_asprintf(ctx,
                              "[%s]",
                              addr);
            }
#else
            return NULL;
#endif
      } else {
            const struct sockaddr_in *sa =
                  (const struct sockaddr_in *)pss;
            uint16_t port = ntohs(sa->sin_port);

            if (port) {
                  dest = talloc_asprintf(ctx,
                              "%s:%d",
                              addr,
                              (unsigned int)port);
            } else {
                  dest = talloc_asprintf(ctx,
                              "%s",
                              addr);
            }
      }
      return dest;
}

/****************************************************************************
 Return the string of an IP address (IPv4 or IPv6).
****************************************************************************/

static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
{
      struct sockaddr_storage sa;
      socklen_t length = sizeof(sa);

      /* Ok, returning a hard coded IPv4 address
       * is bogus, but it's just as bogus as a
       * zero IPv6 address. No good choice here.
       */

      strlcpy(addr_buf, "0.0.0.0", addr_len);

      if (fd == -1) {
            return addr_buf;
      }

      if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
            DEBUG(0,("getsockname failed. Error was %s\n",
                  strerror(errno) ));
            return addr_buf;
      }

      return print_sockaddr_len(addr_buf, addr_len, &sa, length);
}

#if 0
/* Not currently used. JRA. */
/****************************************************************************
 Return the port number we've bound to on a socket.
****************************************************************************/

static int get_socket_port(int fd)
{
      struct sockaddr_storage sa;
      socklen_t length = sizeof(sa);

      if (fd == -1) {
            return -1;
      }

      if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
            DEBUG(0,("getpeername failed. Error was %s\n",
                  strerror(errno) ));
            return -1;
      }

#if defined(HAVE_IPV6)
      if (sa.ss_family == AF_INET6) {
            return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
      }
#endif
      if (sa.ss_family == AF_INET) {
            return ntohs(((struct sockaddr_in *)&sa)->sin_port);
      }
      return -1;
}
#endif

void set_sockaddr_port(struct sockaddr_storage *psa, uint16 port)
{
#if defined(HAVE_IPV6)
      if (psa->ss_family == AF_INET6) {
            ((struct sockaddr_in6 *)psa)->sin6_port = htons(port);
      }
#endif
      if (psa->ss_family == AF_INET) {
            ((struct sockaddr_in *)psa)->sin_port = htons(port);
      }
}

const char *client_name(int fd)
{
      return get_peer_name(fd,false);
}

const char *client_addr(int fd, char *addr, size_t addrlen)
{
      return get_peer_addr(fd,addr,addrlen);
}

const char *client_socket_addr(int fd, char *addr, size_t addr_len)
{
      return get_socket_addr(fd, addr, addr_len);
}

#if 0
/* Not currently used. JRA. */
int client_socket_port(int fd)
{
      return get_socket_port(fd);
}
#endif

/****************************************************************************
 Accessor functions to make thread-safe code easier later...
****************************************************************************/

void set_smb_read_error(enum smb_read_errors *pre,
                  enum smb_read_errors newerr)
{
      if (pre) {
            *pre = newerr;
      }
}

void cond_set_smb_read_error(enum smb_read_errors *pre,
                  enum smb_read_errors newerr)
{
      if (pre && *pre == SMB_READ_OK) {
            *pre = newerr;
      }
}

/****************************************************************************
 Determine if a file descriptor is in fact a socket.
****************************************************************************/

bool is_a_socket(int fd)
{
      int v;
      socklen_t l;
      l = sizeof(int);
      return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
}

enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};

typedef struct smb_socket_option {
      const char *name;
      int level;
      int option;
      int value;
      int opttype;
} smb_socket_option;

static const smb_socket_option socket_options[] = {
  {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
  {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
  {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
#ifdef TCP_NODELAY
  {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
#endif
#ifdef TCP_KEEPCNT
  {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
#endif
#ifdef TCP_KEEPIDLE
  {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
#endif
#ifdef TCP_KEEPINTVL
  {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
#endif
#ifdef IPTOS_LOWDELAY
  {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
#endif
#ifdef IPTOS_THROUGHPUT
  {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
#endif
#ifdef SO_REUSEPORT
  {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
#endif
#ifdef SO_SNDBUF
  {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
#endif
#ifdef SO_RCVBUF
  {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
#endif
#ifdef SO_SNDLOWAT
  {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
#endif
#ifdef SO_RCVLOWAT
  {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
#endif
#ifdef SO_SNDTIMEO
  {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
#endif
#ifdef SO_RCVTIMEO
  {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
#endif
#ifdef TCP_FASTACK
  {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
#endif
  {NULL,0,0,0,0}};

/****************************************************************************
 Print socket options.
****************************************************************************/

static void print_socket_options(int s)
{
      int value;
      socklen_t vlen = 4;
      const smb_socket_option *p = &socket_options[0];

      /* wrapped in if statement to prevent streams
       * leak in SCO Openserver 5.0 */
      /* reported on samba-technical  --jerry */
      if ( DEBUGLEVEL >= 5 ) {
            for (; p->name != NULL; p++) {
                  if (getsockopt(s, p->level, p->option,
                                    (void *)&value, &vlen) == -1) {
                        DEBUG(5,("Could not test socket option %s.\n",
                                          p->name));
                  } else {
                        DEBUG(5,("socket option %s = %d\n",
                                          p->name,value));
                  }
            }
      }
 }

/****************************************************************************
 Set user socket options.
****************************************************************************/

void set_socket_options(int fd, const char *options)
{
      TALLOC_CTX *ctx = talloc_stackframe();
      char *tok;

      while (next_token_talloc(ctx, &options, &tok," \t,")) {
            int ret=0,i;
            int value = 1;
            char *p;
            bool got_value = false;

            if ((p = strchr_m(tok,'='))) {
                  *p = 0;
                  value = atoi(p+1);
                  got_value = true;
            }

            for (i=0;socket_options[i].name;i++)
                  if (strequal(socket_options[i].name,tok))
                        break;

            if (!socket_options[i].name) {
                  DEBUG(0,("Unknown socket option %s\n",tok));
                  continue;
            }

            switch (socket_options[i].opttype) {
            case OPT_BOOL:
            case OPT_INT:
                  ret = setsockopt(fd,socket_options[i].level,
                              socket_options[i].option,
                              (char *)&value,sizeof(int));
                  break;

            case OPT_ON:
                  if (got_value)
                        DEBUG(0,("syntax error - %s "
                              "does not take a value\n",tok));

                  {
                        int on = socket_options[i].value;
                        ret = setsockopt(fd,socket_options[i].level,
                              socket_options[i].option,
                              (char *)&on,sizeof(int));
                  }
                  break;
            }

            if (ret != 0) {
                  DEBUG(0,("Failed to set socket option %s (Error %s)\n",
                        tok, strerror(errno) ));
            }
      }

      TALLOC_FREE(ctx);
      print_socket_options(fd);
}

/****************************************************************************
 Read from a socket.
****************************************************************************/

ssize_t read_udp_v4_socket(int fd,
                  char *buf,
                  size_t len,
                  struct sockaddr_storage *psa)
{
      ssize_t ret;
      socklen_t socklen = sizeof(*psa);
      struct sockaddr_in *si = (struct sockaddr_in *)psa;

      memset((char *)psa,'\0',socklen);

      ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
                  (struct sockaddr *)psa,&socklen);
      if (ret <= 0) {
            /* Don't print a low debug error for a non-blocking socket. */
            if (errno == EAGAIN) {
                  DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
            } else {
                  DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
                        strerror(errno)));
            }
            return 0;
      }

      if (psa->ss_family != AF_INET) {
            DEBUG(2,("read_udp_v4_socket: invalid address family %d "
                  "(not IPv4)\n", (int)psa->ss_family));
            return 0;
      }

      DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
                  inet_ntoa(si->sin_addr),
                  si->sin_port,
                  (unsigned long)ret));

      return ret;
}

/****************************************************************************
 Read data from a socket with a timout in msec.
 mincount = if timeout, minimum to read before returning
 maxcount = number to be read.
 time_out = timeout in milliseconds
****************************************************************************/

NTSTATUS read_socket_with_timeout(int fd, char *buf,
                          size_t mincnt, size_t maxcnt,
                          unsigned int time_out,
                          size_t *size_ret)
{
      fd_set fds;
      int selrtn;
      ssize_t readret;
      size_t nread = 0;
      struct timeval timeout;
      char addr[INET6_ADDRSTRLEN];

      /* just checking .... */
      if (maxcnt <= 0)
            return NT_STATUS_OK;

      /* Blocking read */
      if (time_out == 0) {
            if (mincnt == 0) {
                  mincnt = maxcnt;
            }

            while (nread < mincnt) {
                  readret = sys_read(fd, buf + nread, maxcnt - nread);

                  if (readret == 0) {
                        DEBUG(5,("read_socket_with_timeout: "
                              "blocking read. EOF from client.\n"));
                        return NT_STATUS_END_OF_FILE;
                  }

                  if (readret == -1) {
                        if (fd == get_client_fd()) {
                              /* Try and give an error message
                               * saying what client failed. */
                              DEBUG(0,("read_socket_with_timeout: "
                                    "client %s read error = %s.\n",
                                    get_peer_addr(fd,addr,sizeof(addr)),
                                    strerror(errno) ));
                        } else {
                              DEBUG(0,("read_socket_with_timeout: "
                                    "read error = %s.\n",
                                    strerror(errno) ));
                        }
                        return map_nt_error_from_unix(errno);
                  }
                  nread += readret;
            }
            goto done;
      }

      /* Most difficult - timeout read */
      /* If this is ever called on a disk file and
         mincnt is greater then the filesize then
         system performance will suffer severely as
         select always returns true on disk files */

      /* Set initial timeout */
      timeout.tv_sec = (time_t)(time_out / 1000);
      timeout.tv_usec = (long)(1000 * (time_out % 1000));

      for (nread=0; nread < mincnt; ) {
            FD_ZERO(&fds);
            FD_SET(fd,&fds);

            selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);

            /* Check if error */
            if (selrtn == -1) {
                  /* something is wrong. Maybe the socket is dead? */
                  if (fd == get_client_fd()) {
                        /* Try and give an error message saying
                         * what client failed. */
                        DEBUG(0,("read_socket_with_timeout: timeout "
                        "read for client %s. select error = %s.\n",
                        get_peer_addr(fd,addr,sizeof(addr)),
                        strerror(errno) ));
                  } else {
                        DEBUG(0,("read_socket_with_timeout: timeout "
                        "read. select error = %s.\n",
                        strerror(errno) ));
                  }
                  return map_nt_error_from_unix(errno);
            }

            /* Did we timeout ? */
            if (selrtn == 0) {
                  DEBUG(10,("read_socket_with_timeout: timeout read. "
                        "select timed out.\n"));
                  return NT_STATUS_IO_TIMEOUT;
            }

            readret = sys_read(fd, buf+nread, maxcnt-nread);

            if (readret == 0) {
                  /* we got EOF on the file descriptor */
                  DEBUG(5,("read_socket_with_timeout: timeout read. "
                        "EOF from client.\n"));
                  return NT_STATUS_END_OF_FILE;
            }

            if (readret == -1) {
                  /* the descriptor is probably dead */
                  if (fd == get_client_fd()) {
                        /* Try and give an error message
                         * saying what client failed. */
                        DEBUG(0,("read_socket_with_timeout: timeout "
                              "read to client %s. read error = %s.\n",
                              get_peer_addr(fd,addr,sizeof(addr)),
                              strerror(errno) ));
                  } else {
                        DEBUG(0,("read_socket_with_timeout: timeout "
                              "read. read error = %s.\n",
                              strerror(errno) ));
                  }
                  return map_nt_error_from_unix(errno);
            }

            nread += readret;
      }

 done:
      /* Return the number we got */
      if (size_ret) {
            *size_ret = nread;
      }
      return NT_STATUS_OK;
}

/****************************************************************************
 Read data from the client, reading exactly N bytes.
****************************************************************************/

NTSTATUS read_data(int fd, char *buffer, size_t N)
{
      return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
}

/****************************************************************************
 Write data to a fd.
****************************************************************************/

ssize_t write_data(int fd, const char *buffer, size_t N)
{
      size_t total=0;
      ssize_t ret;
      char addr[INET6_ADDRSTRLEN];

      while (total < N) {
            ret = sys_write(fd,buffer + total,N - total);

            if (ret == -1) {
                  if (fd == get_client_fd()) {
                        /* Try and give an error message saying
                         * what client failed. */
                        DEBUG(0,("write_data: write failure in "
                              "writing to client %s. Error %s\n",
                              get_peer_addr(fd,addr,sizeof(addr)),
                              strerror(errno) ));
                  } else {
                        DEBUG(0,("write_data: write failure. "
                              "Error = %s\n", strerror(errno) ));
                  }
                  return -1;
            }

            if (ret == 0) {
                  return total;
            }

            total += ret;
      }
      return (ssize_t)total;
}

/****************************************************************************
 Send a keepalive packet (rfc1002).
****************************************************************************/

bool send_keepalive(int client)
{
      unsigned char buf[4];

      buf[0] = SMBkeepalive;
      buf[1] = buf[2] = buf[3] = 0;

      return(write_data(client,(char *)buf,4) == 4);
}

/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer.
 This version of the function will return a length of zero on receiving
 a keepalive packet.
 Timeout is in milliseconds.
****************************************************************************/

NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
                                unsigned int timeout,
                                size_t *len)
{
      int msg_type;
      NTSTATUS status;

      status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);

      if (!NT_STATUS_IS_OK(status)) {
            return status;
      }

      *len = smb_len(inbuf);
      msg_type = CVAL(inbuf,0);

      if (msg_type == SMBkeepalive) {
            DEBUG(5,("Got keepalive packet\n"));
      }

      DEBUG(10,("got smb length of %lu\n",(unsigned long)len));

      return NT_STATUS_OK;
}

/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer. This version of the function will
 never return a session keepalive (length of zero).
 Timeout is in milliseconds.
****************************************************************************/

NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
                   size_t *len)
{
      uint8_t msgtype = SMBkeepalive;

      while (msgtype == SMBkeepalive) {
            NTSTATUS status;

            status = read_smb_length_return_keepalive(fd, inbuf, timeout,
                                            len);
            if (!NT_STATUS_IS_OK(status)) {
                  return status;
            }

            msgtype = CVAL(inbuf, 0);
      }

      DEBUG(10,("read_smb_length: got smb length of %lu\n",
              (unsigned long)len));

      return NT_STATUS_OK;
}

/****************************************************************************
 Read an smb from a fd. Note that the buffer *MUST* be of size
 BUFFER_SIZE+SAFETY_MARGIN.
 The timeout is in milliseconds.
 This function will return on receipt of a session keepalive packet.
 maxlen is the max number of bytes to return, not including the 4 byte
 length. If zero it means BUFFER_SIZE+SAFETY_MARGIN limit.
 Doesn't check the MAC on signed packets.
****************************************************************************/

NTSTATUS receive_smb_raw(int fd, char *buffer, unsigned int timeout,
                   size_t maxlen, size_t *p_len)
{
      size_t len;
      NTSTATUS status;

      status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);

      if (!NT_STATUS_IS_OK(status)) {
            DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
            return status;
      }

      /*
       * A WRITEX with CAP_LARGE_WRITEX can be 64k worth of data plus 65 bytes
       * of header. Don't print the error if this fits.... JRA.
       */

      if (len > (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE)) {
            DEBUG(0,("Invalid packet length! (%lu bytes).\n",
                              (unsigned long)len));
            if (len > BUFFER_SIZE + (SAFETY_MARGIN/2)) {
                  return NT_STATUS_INVALID_PARAMETER;
            }
      }

      if(len > 0) {
            if (maxlen) {
                  len = MIN(len,maxlen);
            }

            status = read_socket_with_timeout(
                  fd, buffer+4, len, len, timeout, &len);

            if (!NT_STATUS_IS_OK(status)) {
                  return status;
            }

            /* not all of samba3 properly checks for packet-termination
             * of strings. This ensures that we don't run off into
             * empty space. */
            SSVAL(buffer+4,len, 0);
      }

      *p_len = len;
      return NT_STATUS_OK;
}

/****************************************************************************
 Open a socket of the specified type, port, and address for incoming data.
****************************************************************************/

int open_socket_in(int type,
            uint16_t port,
            int dlevel,
            const struct sockaddr_storage *psock,
            bool rebind)
{
      struct sockaddr_storage sock;
      int res;
      socklen_t slen = sizeof(struct sockaddr_in);

      sock = *psock;

#if defined(HAVE_IPV6)
      if (sock.ss_family == AF_INET6) {
            ((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
            slen = sizeof(struct sockaddr_in6);
      }
#endif
      if (sock.ss_family == AF_INET) {
            ((struct sockaddr_in *)&sock)->sin_port = htons(port);
      }

      res = socket(sock.ss_family, type, 0 );
      if( res == -1 ) {
            if( DEBUGLVL(0) ) {
                  dbgtext( "open_socket_in(): socket() call failed: " );
                  dbgtext( "%s\n", strerror( errno ) );
            }
            return -1;
      }

      /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
      {
            int val = rebind ? 1 : 0;
            if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
                              (char *)&val,sizeof(val)) == -1 ) {
                  if( DEBUGLVL( dlevel ) ) {
                        dbgtext( "open_socket_in(): setsockopt: " );
                        dbgtext( "SO_REUSEADDR = %s ",
                                    val?"true":"false" );
                        dbgtext( "on port %d failed ", port );
                        dbgtext( "with error = %s\n", strerror(errno) );
                  }
            }
#ifdef SO_REUSEPORT
            if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
                              (char *)&val,sizeof(val)) == -1 ) {
                  if( DEBUGLVL( dlevel ) ) {
                        dbgtext( "open_socket_in(): setsockopt: ");
                        dbgtext( "SO_REUSEPORT = %s ",
                                    val?"true":"false");
                        dbgtext( "on port %d failed ", port);
                        dbgtext( "with error = %s\n", strerror(errno));
                  }
            }
#endif /* SO_REUSEPORT */
      }

      /* now we've got a socket - we need to bind it */
      if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
            if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
                        port == SMB_PORT2 || port == NMB_PORT) ) {
                  char addr[INET6_ADDRSTRLEN];
                  print_sockaddr(addr, sizeof(addr),
                              &sock);
                  dbgtext( "bind failed on port %d ", port);
                  dbgtext( "socket_addr = %s.\n", addr);
                  dbgtext( "Error = %s\n", strerror(errno));
            }
            close(res);
            return -1;
      }

      DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
      return( res );
 }

/****************************************************************************
 Create an outgoing socket. timeout is in milliseconds.
**************************************************************************/

int open_socket_out(int type,
            const struct sockaddr_storage *pss,
            uint16_t port,
            int timeout)
{
      char addr[INET6_ADDRSTRLEN];
      struct sockaddr_storage sock_out = *pss;
      int res,ret;
      int connect_loop = 10;
      int increment = 10;

      /* create a socket to write to */
      res = socket(pss->ss_family, type, 0);
      if (res == -1) {
                DEBUG(0,("socket error (%s)\n", strerror(errno)));
            return -1;
      }

      if (type != SOCK_STREAM) {
            return res;
      }

#if defined(HAVE_IPV6)
      if (pss->ss_family == AF_INET6) {
            struct sockaddr_in6 *psa6 = (struct sockaddr_in6 *)&sock_out;
            psa6->sin6_port = htons(port);
            if (psa6->sin6_scope_id == 0 &&
                        IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
                  setup_linklocal_scope_id(&sock_out);
            }
      }
#endif
      if (pss->ss_family == AF_INET) {
            struct sockaddr_in *psa = (struct sockaddr_in *)&sock_out;
            psa->sin_port = htons(port);
      }

      /* set it non-blocking */
      set_blocking(res,false);

      print_sockaddr(addr, sizeof(addr), &sock_out);
      DEBUG(3,("Connecting to %s at port %u\n",
                        addr,
                        (unsigned int)port));

      /* and connect it to the destination */
  connect_again:

      ret = sys_connect(res, (struct sockaddr *)&sock_out);

      /* Some systems return EAGAIN when they mean EINPROGRESS */
      if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
                  errno == EAGAIN) && (connect_loop < timeout) ) {
            smb_msleep(connect_loop);
            timeout -= connect_loop;
            connect_loop += increment;
            if (increment < 250) {
                  /* After 8 rounds we end up at a max of 255 msec */
                  increment *= 1.5;
            }
            goto connect_again;
      }

      if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY ||
                  errno == EAGAIN)) {
            DEBUG(1,("timeout connecting to %s:%u\n",
                              addr,
                              (unsigned int)port));
            close(res);
            return -1;
      }

#ifdef EISCONN
      if (ret < 0 && errno == EISCONN) {
            errno = 0;
            ret = 0;
      }
#endif

      if (ret < 0) {
            DEBUG(2,("error connecting to %s:%d (%s)\n",
                        addr,
                        (unsigned int)port,
                        strerror(errno)));
            close(res);
            return -1;
      }

      /* set it blocking again */
      set_blocking(res,true);

      return res;
}

/****************************************************************************
 Create an outgoing TCP socket to any of the addrs. This is for
 simultaneous connects to port 445 and 139 of a host or even a variety
 of DC's all of which are equivalent for our purposes.
**************************************************************************/

bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
                   int timeout, int *fd_index, int *fd)
{
      int i, resulting_index, res;
      int *sockets;
      bool good_connect;

      fd_set r_fds, wr_fds;
      struct timeval tv;
      int maxfd;

      int connect_loop = 10000; /* 10 milliseconds */

      timeout *= 1000;  /* convert to microseconds */

      sockets = SMB_MALLOC_ARRAY(int, num_addrs);

      if (sockets == NULL)
            return false;

      resulting_index = -1;

      for (i=0; i<num_addrs; i++)
            sockets[i] = -1;

      for (i=0; i<num_addrs; i++) {
            sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
            if (sockets[i] < 0)
                  goto done;
            set_blocking(sockets[i], false);
      }

 connect_again:
      good_connect = false;

      for (i=0; i<num_addrs; i++) {
            const struct sockaddr * a = 
                (const struct sockaddr *)&(addrs[i]);

            if (sockets[i] == -1)
                  continue;

            if (sys_connect(sockets[i], a) == 0) {
                  /* Rather unlikely as we are non-blocking, but it
                   * might actually happen. */
                  resulting_index = i;
                  goto done;
            }

            if (errno == EINPROGRESS || errno == EALREADY ||
#ifdef EISCONN
                  errno == EISCONN ||
#endif
                errno == EAGAIN || errno == EINTR) {
                  /* These are the error messages that something is
                     progressing. */
                  good_connect = true;
            } else if (errno != 0) {
                  /* There was a direct error */
                  close(sockets[i]);
                  sockets[i] = -1;
            }
      }

      if (!good_connect) {
            /* All of the connect's resulted in real error conditions */
            goto done;
      }

      /* Lets see if any of the connect attempts succeeded */

      maxfd = 0;
      FD_ZERO(&wr_fds);
      FD_ZERO(&r_fds);

      for (i=0; i<num_addrs; i++) {
            if (sockets[i] == -1)
                  continue;
            FD_SET(sockets[i], &wr_fds);
            FD_SET(sockets[i], &r_fds);
            if (sockets[i]>maxfd)
                  maxfd = sockets[i];
      }

      tv.tv_sec = 0;
      tv.tv_usec = connect_loop;

      res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);

      if (res < 0)
            goto done;

      if (res == 0)
            goto next_round;

      for (i=0; i<num_addrs; i++) {

            if (sockets[i] == -1)
                  continue;

            /* Stevens, Network Programming says that if there's a
             * successful connect, the socket is only writable. Upon an
             * error, it's both readable and writable. */

            if (FD_ISSET(sockets[i], &r_fds) &&
                FD_ISSET(sockets[i], &wr_fds)) {
                  /* readable and writable, so it's an error */
                  close(sockets[i]);
                  sockets[i] = -1;
                  continue;
            }

            if (!FD_ISSET(sockets[i], &r_fds) &&
                FD_ISSET(sockets[i], &wr_fds)) {
                  /* Only writable, so it's connected */
                  resulting_index = i;
                  goto done;
            }
      }

 next_round:

      timeout -= connect_loop;
      if (timeout <= 0)
            goto done;
      connect_loop *= 1.5;
      if (connect_loop > timeout)
            connect_loop = timeout;
      goto connect_again;

 done:
      for (i=0; i<num_addrs; i++) {
            if (i == resulting_index)
                  continue;
            if (sockets[i] >= 0)
                  close(sockets[i]);
      }

      if (resulting_index >= 0) {
            *fd_index = resulting_index;
            *fd = sockets[*fd_index];
            set_blocking(*fd, true);
      }

      free(sockets);

      return (resulting_index >= 0);
}
/****************************************************************************
 Open a connected UDP socket to host on port
**************************************************************************/

int open_udp_socket(const char *host, int port)
{
      int type = SOCK_DGRAM;
      struct sockaddr_in sock_out;
      int res;
      struct in_addr addr;

      (void)interpret_addr2(&addr, host);

      res = socket(PF_INET, type, 0);
      if (res == -1) {
            return -1;
      }

      memset((char *)&sock_out,'\0',sizeof(sock_out));
      putip((char *)&sock_out.sin_addr,(char *)&addr);
      sock_out.sin_port = htons(port);
      sock_out.sin_family = PF_INET;

      if (sys_connect(res,(struct sockaddr *)&sock_out)) {
            close(res);
            return -1;
      }

      return res;
}

/*******************************************************************
 Return the IP addr of the remote end of a socket as a string.
 Optionally return the struct sockaddr_storage.
 ******************************************************************/

static const char *get_peer_addr_internal(int fd,
                        char *addr_buf,
                        size_t addr_buf_len,
                        struct sockaddr_storage *pss,
                        socklen_t *plength)
{
      struct sockaddr_storage ss;
      socklen_t length = sizeof(ss);

      strlcpy(addr_buf,"0.0.0.0",addr_buf_len);

      if (fd == -1) {
            return addr_buf;
      }

      if (pss == NULL) {
            pss = &ss;
      }
      if (plength == NULL) {
            plength = &length;
      }

      if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
            DEBUG(0,("getpeername failed. Error was %s\n",
                              strerror(errno) ));
            return addr_buf;
      }

      print_sockaddr_len(addr_buf,
                  addr_buf_len,
                  pss,
                  *plength);
      return addr_buf;
}

/*******************************************************************
 Matchname - determine if host name matches IP address. Used to
 confirm a hostname lookup to prevent spoof attacks.
******************************************************************/

static bool matchname(const char *remotehost,
            const struct sockaddr_storage *pss,
            socklen_t len)
{
      struct addrinfo *res = NULL;
      struct addrinfo *ailist = NULL;
      char addr_buf[INET6_ADDRSTRLEN];
      bool ret = interpret_string_addr_internal(&ailist,
                  remotehost,
#ifdef AI_ADDRCONFIG
                  AI_ADDRCONFIG|AI_CANONNAME);
#else
                  AI_CANONNAME);
#endif

      if (!ret || ailist == NULL) {
            DEBUG(3,("matchname: getaddrinfo failed for "
                  "name %s [%s]\n",
                  remotehost,
                  gai_strerror(ret) ));
            return false;
      }

      /*
       * Make sure that getaddrinfo() returns the "correct" host name.
       */

      if (ailist->ai_canonname == NULL ||
            (!strequal(remotehost, ailist->ai_canonname) &&
             !strequal(remotehost, "localhost"))) {
            DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
                   remotehost,
                   ailist->ai_canonname ?
                         ailist->ai_canonname : "(NULL)"));
            freeaddrinfo(ailist);
            return false;
      }

      /* Look up the host address in the address list we just got. */
      for (res = ailist; res; res = res->ai_next) {
            if (!res->ai_addr) {
                  continue;
            }
            if (addr_equal((const struct sockaddr_storage *)res->ai_addr,
                              pss)) {
                  freeaddrinfo(ailist);
                  return true;
            }
      }

      /*
       * The host name does not map to the original host address. Perhaps
       * someone has compromised a name server. More likely someone botched
       * it, but that could be dangerous, too.
       */

      DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
            print_sockaddr_len(addr_buf,
                  sizeof(addr_buf),
                  pss,
                  len),
             ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));

      if (ailist) {
            freeaddrinfo(ailist);
      }
      return false;
}

/*******************************************************************
 Deal with the singleton cache.
******************************************************************/

struct name_addr_pair {
      struct sockaddr_storage ss;
      const char *name;
};

/*******************************************************************
 Lookup a name/addr pair. Returns memory allocated from memcache.
******************************************************************/

static bool lookup_nc(struct name_addr_pair *nc)
{
      DATA_BLOB tmp;

      ZERO_STRUCTP(nc);

      if (!memcache_lookup(
                  NULL, SINGLETON_CACHE,
                  data_blob_string_const("get_peer_name"),
                  &tmp)) {
            return false;
      }

      memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
      nc->name = (const char *)tmp.data + sizeof(nc->ss);
      return true;
}

/*******************************************************************
 Save a name/addr pair.
******************************************************************/

static void store_nc(const struct name_addr_pair *nc)
{
      DATA_BLOB tmp;
      size_t namelen = strlen(nc->name);

      tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
      if (!tmp.data) {
            return;
      }
      memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
      memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);

      memcache_add(NULL, SINGLETON_CACHE,
                  data_blob_string_const("get_peer_name"),
                  tmp);
      data_blob_free(&tmp);
}

/*******************************************************************
 Return the DNS name of the remote end of a socket.
******************************************************************/

const char *get_peer_name(int fd, bool force_lookup)
{
      struct name_addr_pair nc;
      char addr_buf[INET6_ADDRSTRLEN];
      struct sockaddr_storage ss;
      socklen_t length = sizeof(ss);
      const char *p;
      int ret;
      char name_buf[MAX_DNS_NAME_LENGTH];
      char tmp_name[MAX_DNS_NAME_LENGTH];

      /* reverse lookups can be *very* expensive, and in many
         situations won't work because many networks don't link dhcp
         with dns. To avoid the delay we avoid the lookup if
         possible */
      if (!lp_hostname_lookups() && (force_lookup == false)) {
            length = sizeof(nc.ss);
            nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
                  &nc.ss, &length);
            store_nc(&nc);
            lookup_nc(&nc);
            return nc.name ? nc.name : "UNKNOWN";
      }

      lookup_nc(&nc);

      memset(&ss, '\0', sizeof(ss));
      p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), &ss, &length);

      /* it might be the same as the last one - save some DNS work */
      if (addr_equal(&ss, &nc.ss)) {
            return nc.name ? nc.name : "UNKNOWN";
      }

      /* Not the same. We need to lookup. */
      if (fd == -1) {
            return "UNKNOWN";
      }

      /* Look up the remote host name. */
      ret = sys_getnameinfo((struct sockaddr *)&ss,
                  length,
                  name_buf,
                  sizeof(name_buf),
                  NULL,
                  0,
                  0);

      if (ret) {
            DEBUG(1,("get_peer_name: getnameinfo failed "
                  "for %s with error %s\n",
                  p,
                  gai_strerror(ret)));
            strlcpy(name_buf, p, sizeof(name_buf));
      } else {
            if (!matchname(name_buf, &ss, length)) {
                  DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
                  strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
            }
      }

      /* can't pass the same source and dest strings in when you
         use --enable-developer or the clobber_region() call will
         get you */

      strlcpy(tmp_name, name_buf, sizeof(tmp_name));
      alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
      if (strstr(name_buf,"..")) {
            strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
      }

      nc.name = name_buf;
      nc.ss = ss;

      store_nc(&nc);
      lookup_nc(&nc);
      return nc.name ? nc.name : "UNKNOWN";
}

/*******************************************************************
 Return the IP addr of the remote end of a socket as a string.
 ******************************************************************/

const char *get_peer_addr(int fd, char *addr, size_t addr_len)
{
      return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
}

/*******************************************************************
 Create protected unix domain socket.

 Some unixes cannot set permissions on a ux-dom-sock, so we
 have to make sure that the directory contains the protection
 permissions instead.
 ******************************************************************/

int create_pipe_sock(const char *socket_dir,
                 const char *socket_name,
                 mode_t dir_perms)
{
#ifdef HAVE_UNIXSOCKET
      struct sockaddr_un sunaddr;
      struct stat st;
      int sock;
      mode_t old_umask;
      char *path = NULL;

      old_umask = umask(0);

      /* Create the socket directory or reuse the existing one */

      if (lstat(socket_dir, &st) == -1) {
            if (errno == ENOENT) {
                  /* Create directory */
                  if (mkdir(socket_dir, dir_perms) == -1) {
                        DEBUG(0, ("error creating socket directory "
                              "%s: %s\n", socket_dir,
                              strerror(errno)));
                        goto out_umask;
                  }
            } else {
                  DEBUG(0, ("lstat failed on socket directory %s: %s\n",
                        socket_dir, strerror(errno)));
                  goto out_umask;
            }
      } else {
            /* Check ownership and permission on existing directory */
            if (!S_ISDIR(st.st_mode)) {
                  DEBUG(0, ("socket directory %s isn't a directory\n",
                        socket_dir));
                  goto out_umask;
            }
            if ((st.st_uid != sec_initial_uid()) ||
                        ((st.st_mode & 0777) != dir_perms)) {
                  DEBUG(0, ("invalid permissions on socket directory "
                        "%s\n", socket_dir));
                  goto out_umask;
            }
      }

      /* Create the socket file */

      sock = socket(AF_UNIX, SOCK_STREAM, 0);

      if (sock == -1) {
            DEBUG(0, ("create_pipe_sock: socket error %s\n",
                  strerror(errno) ));
                goto out_close;
      }

      asprintf(&path, "%s/%s", socket_dir, socket_name);
      if (!path) {
                goto out_close;
      }

      unlink(path);
      memset(&sunaddr, 0, sizeof(sunaddr));
      sunaddr.sun_family = AF_UNIX;
      strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));

      if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
            DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
                  strerror(errno)));
            goto out_close;
      }

      if (listen(sock, 5) == -1) {
            DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
                  strerror(errno)));
            goto out_close;
      }

      SAFE_FREE(path);

      umask(old_umask);
      return sock;

out_close:
      SAFE_FREE(path);
      close(sock);

out_umask:
      umask(old_umask);
      return -1;

#else
        DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
        return -1;
#endif /* HAVE_UNIXSOCKET */
}

/****************************************************************************
 Get my own canonical name, including domain.
****************************************************************************/

const char *get_mydnsfullname(void)
{
      struct addrinfo *res = NULL;
      char my_hostname[HOST_NAME_MAX];
      bool ret;
      DATA_BLOB tmp;

      if (memcache_lookup(NULL, SINGLETON_CACHE,
                  data_blob_string_const("get_mydnsfullname"),
                  &tmp)) {
            SMB_ASSERT(tmp.length > 0);
            return (const char *)tmp.data;
      }

      /* get my host name */
      if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
            DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
            return NULL;
      }

      /* Ensure null termination. */
      my_hostname[sizeof(my_hostname)-1] = '\0';

      ret = interpret_string_addr_internal(&res,
                              my_hostname,
#ifdef AI_ADDRCONFIG
                              AI_ADDRCONFIG|AI_CANONNAME);
#else
                              AI_CANONNAME);
#endif

      if (!ret || res == NULL) {
            DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
                  "name %s [%s]\n",
                  my_hostname,
                  gai_strerror(ret) ));
            return NULL;
      }

      /*
       * Make sure that getaddrinfo() returns the "correct" host name.
       */

      if (res->ai_canonname == NULL) {
            DEBUG(3,("get_mydnsfullname: failed to get "
                  "canonical name for %s\n",
                  my_hostname));
            freeaddrinfo(res);
            return NULL;
      }

      /* This copies the data, so we must do a lookup
       * afterwards to find the value to return.
       */

      memcache_add(NULL, SINGLETON_CACHE,
                  data_blob_string_const("get_mydnsfullname"),
                  data_blob_string_const(res->ai_canonname));

      if (!memcache_lookup(NULL, SINGLETON_CACHE,
                  data_blob_string_const("get_mydnsfullname"),
                  &tmp)) {
            tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
                        strlen(res->ai_canonname) + 1);
      }

      freeaddrinfo(res);

      return (const char *)tmp.data;
}

/************************************************************
 Is this my name ?
************************************************************/

bool is_myname_or_ipaddr(const char *s)
{
      TALLOC_CTX *ctx = talloc_tos();
      char *name = NULL;
      const char *dnsname;
      char *servername = NULL;

      if (!s) {
            return false;
      }

      /* Santize the string from '\\name' */
      name = talloc_strdup(ctx, s);
      if (!name) {
            return false;
      }

      servername = strrchr_m(name, '\\' );
      if (!servername) {
            servername = name;
      } else {
            servername++;
      }

      /* Optimize for the common case */
      if (strequal(servername, global_myname())) {
            return true;
      }

      /* Check for an alias */
      if (is_myname(servername)) {
            return true;
      }

      /* Check for loopback */
      if (strequal(servername, "127.0.0.1") ||
                  strequal(servername, "::1")) {
            return true;
      }

      if (strequal(servername, "localhost")) {
            return true;
      }

      /* Maybe it's my dns name */
      dnsname = get_mydnsfullname();
      if (dnsname && strequal(servername, dnsname)) {
            return true;
      }

      /* Handle possible CNAME records - convert to an IP addr. */
      if (!is_ipaddress(servername)) {
            /* Use DNS to resolve the name, but only the first address */
            struct sockaddr_storage ss;
            if (interpret_string_addr(&ss, servername,0)) {
                  print_sockaddr(name,
                              sizeof(name),
                              &ss);
                  servername = name;
            }
      }

      /* Maybe its an IP address? */
      if (is_ipaddress(servername)) {
            struct sockaddr_storage ss;
            struct iface_struct *nics;
            int i, n;

            if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
                  return false;
            }

            if (is_zero_addr(&ss) || is_loopback_addr(&ss)) {
                  return false;
            }

            nics = TALLOC_ARRAY(ctx, struct iface_struct,
                              MAX_INTERFACES);
            if (!nics) {
                  return false;
            }
            n = get_interfaces(nics, MAX_INTERFACES);
            for (i=0; i<n; i++) {
                  if (addr_equal(&nics[i].ip, &ss)) {
                        TALLOC_FREE(nics);
                        return true;
                  }
            }
            TALLOC_FREE(nics);
      }

      /* No match */
      return false;
}

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