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socket_wrapper.c

/*
 * Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
 * Copyright (C) Stefan Metzmacher 2006-2009 <metze@samba.org>
 *
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * 3. Neither the name of the author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/*
   Socket wrapper library. Passes all socket communication over
   unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
   is set.
*/

#ifdef _SAMBA_BUILD_

#define SOCKET_WRAPPER_NOT_REPLACE
#include "../replace/replace.h"
#include "system/network.h"
#include "system/filesys.h"
#include "system/time.h"

#else /* _SAMBA_BUILD_ */

#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/filio.h>
#include <errno.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>

#endif

#ifndef _PUBLIC_
#define _PUBLIC_
#endif

#define SWRAP_DLIST_ADD(list,item) do { \
      if (!(list)) { \
            (item)->prev      = NULL; \
            (item)->next      = NULL; \
            (list)            = (item); \
      } else { \
            (item)->prev      = NULL; \
            (item)->next      = (list); \
            (list)->prev      = (item); \
            (list)            = (item); \
      } \
} while (0)

#define SWRAP_DLIST_REMOVE(list,item) do { \
      if ((list) == (item)) { \
            (list)            = (item)->next; \
            if (list) { \
                  (list)->prev      = NULL; \
            } \
      } else { \
            if ((item)->prev) { \
                  (item)->prev->next      = (item)->next; \
            } \
            if ((item)->next) { \
                  (item)->next->prev      = (item)->prev; \
            } \
      } \
      (item)->prev      = NULL; \
      (item)->next      = NULL; \
} while (0)

/* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
 * for now */
#define REWRITE_CALLS 

#ifdef REWRITE_CALLS
#define real_accept accept
#define real_connect connect
#define real_bind bind
#define real_listen listen
#define real_getpeername getpeername
#define real_getsockname getsockname
#define real_getsockopt getsockopt
#define real_setsockopt setsockopt
#define real_recvfrom recvfrom
#define real_sendto sendto
#define real_sendmsg sendmsg
#define real_ioctl ioctl
#define real_recv recv
#define real_read read
#define real_send send
#define real_readv readv
#define real_writev writev
#define real_socket socket
#define real_close close
#endif

#ifdef HAVE_GETTIMEOFDAY_TZ
#define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
#else
#define swrapGetTimeOfDay(tval)     gettimeofday(tval)
#endif

/* we need to use a very terse format here as IRIX 6.4 silently
   truncates names to 16 chars, so if we use a longer name then we
   can't tell which port a packet came from with recvfrom() 
   
   with this format we have 8 chars left for the directory name
*/
#define SOCKET_FORMAT "%c%02X%04X"
#define SOCKET_TYPE_CHAR_TCP        'T'
#define SOCKET_TYPE_CHAR_UDP        'U'
#define SOCKET_TYPE_CHAR_TCP_V6           'X'
#define SOCKET_TYPE_CHAR_UDP_V6           'Y'

#define MAX_WRAPPED_INTERFACES 16

#ifdef HAVE_IPV6
/*
 * FD00::5357:5FXX
 */
static const struct in6_addr *swrap_ipv6(void)
{
      static struct in6_addr v;
      static int initialized;
      int ret;

      if (initialized) {
            return &v;
      }
      initialized = 1;

      ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
      if (ret <= 0) {
            abort();
      }

      return &v;
}
#endif

static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
{
      struct sockaddr *ret = (struct sockaddr *)malloc(len);
      memcpy(ret, data, len);
      return ret;
}

static void set_port(int family, int prt, struct sockaddr *addr)
{
      switch (family) {
      case AF_INET:
            ((struct sockaddr_in *)addr)->sin_port = htons(prt);
            break;
#ifdef HAVE_IPV6
      case AF_INET6:
            ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
            break;
#endif
      }
}

static size_t socket_length(int family)
{
      switch (family) {
      case AF_INET:
            return sizeof(struct sockaddr_in);
#ifdef HAVE_IPV6
      case AF_INET6:
            return sizeof(struct sockaddr_in6);
#endif
      }
      return 0;
}



struct socket_info
{
      int fd;

      int family;
      int type;
      int protocol;
      int bound;
      int bcast;
      int is_server;
      int connected;
      int defer_connect;

      char *path;
      char *tmp_path;

      struct sockaddr *myname;
      socklen_t myname_len;

      struct sockaddr *peername;
      socklen_t peername_len;

      struct {
            unsigned long pck_snd;
            unsigned long pck_rcv;
      } io;

      struct socket_info *prev, *next;
};

static struct socket_info *sockets;

const char *socket_wrapper_dir(void)
{
      const char *s = getenv("SOCKET_WRAPPER_DIR");
      if (s == NULL) {
            return NULL;
      }
      if (strncmp(s, "./", 2) == 0) {
            s += 2;
      }
      return s;
}

unsigned int socket_wrapper_default_iface(void)
{
      const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
      if (s) {
            unsigned int iface;
            if (sscanf(s, "%u", &iface) == 1) {
                  if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
                        return iface;
                  }
            }
      }

      return 1;/* 127.0.0.1 */
}

static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
{
      unsigned int iface;
      unsigned int prt;
      const char *p;
      char type;

      p = strrchr(un->sun_path, '/');
      if (p) p++; else p = un->sun_path;

      if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
            errno = EINVAL;
            return -1;
      }

      if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
            errno = EINVAL;
            return -1;
      }

      if (prt > 0xFFFF) {
            errno = EINVAL;
            return -1;
      }

      switch(type) {
      case SOCKET_TYPE_CHAR_TCP:
      case SOCKET_TYPE_CHAR_UDP: {
            struct sockaddr_in *in2 = (struct sockaddr_in *)in;
            
            if ((*len) < sizeof(*in2)) {
                errno = EINVAL;
                return -1;
            }

            memset(in2, 0, sizeof(*in2));
            in2->sin_family = AF_INET;
            in2->sin_addr.s_addr = htonl((127<<24) | iface);
            in2->sin_port = htons(prt);

            *len = sizeof(*in2);
            break;
      }
#ifdef HAVE_IPV6
      case SOCKET_TYPE_CHAR_TCP_V6:
      case SOCKET_TYPE_CHAR_UDP_V6: {
            struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
            
            if ((*len) < sizeof(*in2)) {
                  errno = EINVAL;
                  return -1;
            }

            memset(in2, 0, sizeof(*in2));
            in2->sin6_family = AF_INET6;
            in2->sin6_addr = *swrap_ipv6();
            in2->sin6_addr.s6_addr[15] = iface;
            in2->sin6_port = htons(prt);

            *len = sizeof(*in2);
            break;
      }
#endif
      default:
            errno = EINVAL;
            return -1;
      }

      return 0;
}

static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
                        int *bcast)
{
      char type = '\0';
      unsigned int prt;
      unsigned int iface;
      int is_bcast = 0;

      if (bcast) *bcast = 0;

      switch (inaddr->sa_family) {
      case AF_INET: {
            const struct sockaddr_in *in = 
                (const struct sockaddr_in *)inaddr;
            unsigned int addr = ntohl(in->sin_addr.s_addr);
            char u_type = '\0';
            char b_type = '\0';
            char a_type = '\0';

            switch (si->type) {
            case SOCK_STREAM:
                  u_type = SOCKET_TYPE_CHAR_TCP;
                  break;
            case SOCK_DGRAM:
                  u_type = SOCKET_TYPE_CHAR_UDP;
                  a_type = SOCKET_TYPE_CHAR_UDP;
                  b_type = SOCKET_TYPE_CHAR_UDP;
                  break;
            }

            prt = ntohs(in->sin_port);
            if (a_type && addr == 0xFFFFFFFF) {
                  /* 255.255.255.255 only udp */
                  is_bcast = 2;
                  type = a_type;
                  iface = socket_wrapper_default_iface();
            } else if (b_type && addr == 0x7FFFFFFF) {
                  /* 127.255.255.255 only udp */
                  is_bcast = 1;
                  type = b_type;
                  iface = socket_wrapper_default_iface();
            } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
                  /* 127.0.0.X */
                  is_bcast = 0;
                  type = u_type;
                  iface = (addr & 0x000000FF);
            } else {
                  errno = ENETUNREACH;
                  return -1;
            }
            if (bcast) *bcast = is_bcast;
            break;
      }
#ifdef HAVE_IPV6
      case AF_INET6: {
            const struct sockaddr_in6 *in = 
                (const struct sockaddr_in6 *)inaddr;
            struct in6_addr cmp;

            switch (si->type) {
            case SOCK_STREAM:
                  type = SOCKET_TYPE_CHAR_TCP_V6;
                  break;
            case SOCK_DGRAM:
                  type = SOCKET_TYPE_CHAR_UDP_V6;
                  break;
            }

            /* XXX no multicast/broadcast */

            prt = ntohs(in->sin6_port);

            cmp = in->sin6_addr;
            cmp.s6_addr[15] = 0;
            if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
                  iface = in->sin6_addr.s6_addr[15];
            } else {
                  errno = ENETUNREACH;
                  return -1;
            }

            break;
      }
#endif
      default:
            errno = ENETUNREACH;
            return -1;
      }

      if (prt == 0) {
            errno = EINVAL;
            return -1;
      }

      if (is_bcast) {
            snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL", 
                   socket_wrapper_dir());
            /* the caller need to do more processing */
            return 0;
      }

      snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT, 
             socket_wrapper_dir(), type, iface, prt);

      return 0;
}

static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
                         int *bcast)
{
      char type = '\0';
      unsigned int prt;
      unsigned int iface;
      struct stat st;
      int is_bcast = 0;

      if (bcast) *bcast = 0;

      switch (si->family) {
      case AF_INET: {
            const struct sockaddr_in *in = 
                (const struct sockaddr_in *)inaddr;
            unsigned int addr = ntohl(in->sin_addr.s_addr);
            char u_type = '\0';
            char d_type = '\0';
            char b_type = '\0';
            char a_type = '\0';

            prt = ntohs(in->sin_port);

            switch (si->type) {
            case SOCK_STREAM:
                  u_type = SOCKET_TYPE_CHAR_TCP;
                  d_type = SOCKET_TYPE_CHAR_TCP;
                  break;
            case SOCK_DGRAM:
                  u_type = SOCKET_TYPE_CHAR_UDP;
                  d_type = SOCKET_TYPE_CHAR_UDP;
                  a_type = SOCKET_TYPE_CHAR_UDP;
                  b_type = SOCKET_TYPE_CHAR_UDP;
                  break;
            }

            if (addr == 0) {
                  /* 0.0.0.0 */
                  is_bcast = 0;
                  type = d_type;
                  iface = socket_wrapper_default_iface();
            } else if (a_type && addr == 0xFFFFFFFF) {
                  /* 255.255.255.255 only udp */
                  is_bcast = 2;
                  type = a_type;
                  iface = socket_wrapper_default_iface();
            } else if (b_type && addr == 0x7FFFFFFF) {
                  /* 127.255.255.255 only udp */
                  is_bcast = 1;
                  type = b_type;
                  iface = socket_wrapper_default_iface();
            } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
                  /* 127.0.0.X */
                  is_bcast = 0;
                  type = u_type;
                  iface = (addr & 0x000000FF);
            } else {
                  errno = EADDRNOTAVAIL;
                  return -1;
            }
            break;
      }
#ifdef HAVE_IPV6
      case AF_INET6: {
            const struct sockaddr_in6 *in = 
                (const struct sockaddr_in6 *)inaddr;
            struct in6_addr cmp;

            switch (si->type) {
            case SOCK_STREAM:
                  type = SOCKET_TYPE_CHAR_TCP_V6;
                  break;
            case SOCK_DGRAM:
                  type = SOCKET_TYPE_CHAR_UDP_V6;
                  break;
            }

            /* XXX no multicast/broadcast */

            prt = ntohs(in->sin6_port);

            cmp = in->sin6_addr;
            cmp.s6_addr[15] = 0;
            if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
                  iface = socket_wrapper_default_iface();
            } else if (IN6_ARE_ADDR_EQUAL(swrap_ipv6(), &cmp)) {
                  iface = in->sin6_addr.s6_addr[15];
            } else {
                  errno = EADDRNOTAVAIL;
                  return -1;
            }

            break;
      }
#endif
      default:
            errno = EADDRNOTAVAIL;
            return -1;
      }


      if (bcast) *bcast = is_bcast;

      if (prt == 0) {
            /* handle auto-allocation of ephemeral ports */
            for (prt = 5001; prt < 10000; prt++) {
                  snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT, 
                         socket_wrapper_dir(), type, iface, prt);
                  if (stat(un->sun_path, &st) == 0) continue;

                  set_port(si->family, prt, si->myname);
                  break;
            }
            if (prt == 10000) {
                  errno = ENFILE;
                  return -1;
            }
      }

      snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT, 
             socket_wrapper_dir(), type, iface, prt);
      return 0;
}

static struct socket_info *find_socket_info(int fd)
{
      struct socket_info *i;
      for (i = sockets; i; i = i->next) {
            if (i->fd == fd) 
                  return i;
      }

      return NULL;
}

static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len, 
                          struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
{
      if (!out_addr)
            return 0;

      out_addr->sun_family = AF_UNIX;

      switch (in_addr->sa_family) {
      case AF_INET:
#ifdef HAVE_IPV6
      case AF_INET6:
#endif
            switch (si->type) {
            case SOCK_STREAM:
            case SOCK_DGRAM:
                  break;
            default:
                  errno = ESOCKTNOSUPPORT;
                  return -1;
            }
            if (alloc_sock) {
                  return convert_in_un_alloc(si, in_addr, out_addr, bcast);
            } else {
                  return convert_in_un_remote(si, in_addr, out_addr, bcast);
            }
      default:
            break;
      }
      
      errno = EAFNOSUPPORT;
      return -1;
}

static int sockaddr_convert_from_un(const struct socket_info *si, 
                            const struct sockaddr_un *in_addr, 
                            socklen_t un_addrlen,
                            int family,
                            struct sockaddr *out_addr,
                            socklen_t *out_addrlen)
{
      if (out_addr == NULL || out_addrlen == NULL) 
            return 0;

      if (un_addrlen == 0) {
            *out_addrlen = 0;
            return 0;
      }

      switch (family) {
      case AF_INET:
#ifdef HAVE_IPV6
      case AF_INET6:
#endif
            switch (si->type) {
            case SOCK_STREAM:
            case SOCK_DGRAM:
                  break;
            default:
                  errno = ESOCKTNOSUPPORT;
                  return -1;
            }
            return convert_un_in(in_addr, out_addr, out_addrlen);
      default:
            break;
      }

      errno = EAFNOSUPPORT;
      return -1;
}

enum swrap_packet_type {
      SWRAP_CONNECT_SEND,
      SWRAP_CONNECT_UNREACH,
      SWRAP_CONNECT_RECV,
      SWRAP_CONNECT_ACK,
      SWRAP_ACCEPT_SEND,
      SWRAP_ACCEPT_RECV,
      SWRAP_ACCEPT_ACK,
      SWRAP_RECVFROM,
      SWRAP_SENDTO,
      SWRAP_SENDTO_UNREACH,
      SWRAP_PENDING_RST,
      SWRAP_RECV,
      SWRAP_RECV_RST,
      SWRAP_SEND,
      SWRAP_SEND_RST,
      SWRAP_CLOSE_SEND,
      SWRAP_CLOSE_RECV,
      SWRAP_CLOSE_ACK,
};

struct swrap_file_hdr {
      uint32_t    magic;
      uint16_t    version_major;
      uint16_t    version_minor;
      int32_t           timezone;
      uint32_t    sigfigs;
      uint32_t    frame_max_len;
#define SWRAP_FRAME_LENGTH_MAX 0xFFFF
      uint32_t    link_type;
};
#define SWRAP_FILE_HDR_SIZE 24

struct swrap_packet_frame {
      uint32_t seconds;
      uint32_t micro_seconds;
      uint32_t recorded_length;
      uint32_t full_length;
};
#define SWRAP_PACKET_FRAME_SIZE 16

union swrap_packet_ip {
      struct {
            uint8_t           ver_hdrlen;
            uint8_t           tos;
            uint16_t    packet_length;
            uint16_t    identification;
            uint8_t           flags;
            uint8_t           fragment;
            uint8_t           ttl;
            uint8_t           protocol;
            uint16_t    hdr_checksum;
            uint32_t    src_addr;
            uint32_t    dest_addr;
      } v4;
#define SWRAP_PACKET_IP_V4_SIZE 20
      struct {
            uint8_t           ver_prio;
            uint8_t           flow_label_high;
            uint16_t    flow_label_low;
            uint16_t    payload_length;
            uint8_t           next_header;
            uint8_t           hop_limit;
            uint8_t           src_addr[16];
            uint8_t           dest_addr[16];
      } v6;
#define SWRAP_PACKET_IP_V6_SIZE 40
};
#define SWRAP_PACKET_IP_SIZE 40

union swrap_packet_payload {
      struct {
            uint16_t    source_port;
            uint16_t    dest_port;
            uint32_t    seq_num;
            uint32_t    ack_num;
            uint8_t           hdr_length;
            uint8_t           control;
            uint16_t    window;
            uint16_t    checksum;
            uint16_t    urg;
      } tcp;
#define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
      struct {
            uint16_t    source_port;
            uint16_t    dest_port;
            uint16_t    length;
            uint16_t    checksum;
      } udp;
#define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
      struct {
            uint8_t           type;
            uint8_t           code;
            uint16_t    checksum;
            uint32_t    unused;
      } icmp4;
#define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
      struct {
            uint8_t           type;
            uint8_t           code;
            uint16_t    checksum;
            uint32_t    unused;
      } icmp6;
#define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
};
#define SWRAP_PACKET_PAYLOAD_SIZE 20

#define SWRAP_PACKET_MIN_ALLOC \
      (SWRAP_PACKET_FRAME_SIZE + \
       SWRAP_PACKET_IP_SIZE + \
       SWRAP_PACKET_PAYLOAD_SIZE)

static const char *socket_wrapper_pcap_file(void)
{
      static int initialized = 0;
      static const char *s = NULL;
      static const struct swrap_file_hdr h;
      static const struct swrap_packet_frame f;
      static const union swrap_packet_ip i;
      static const union swrap_packet_payload p;

      if (initialized == 1) {
            return s;
      }
      initialized = 1;

      /*
       * TODO: don't use the structs use plain buffer offsets
       *       and PUSH_U8(), PUSH_U16() and PUSH_U32()
       * 
       * for now make sure we disable PCAP support
       * if the struct has alignment!
       */
      if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
            return NULL;
      }
      if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
            return NULL;
      }
      if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
            return NULL;
      }
      if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
            return NULL;
      }
      if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
            return NULL;
      }
      if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
            return NULL;
      }
      if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
            return NULL;
      }
      if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
            return NULL;
      }
      if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
            return NULL;
      }
      if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
            return NULL;
      }

      s = getenv("SOCKET_WRAPPER_PCAP_FILE");
      if (s == NULL) {
            return NULL;
      }
      if (strncmp(s, "./", 2) == 0) {
            s += 2;
      }
      return s;
}

static uint8_t *swrap_packet_init(struct timeval *tval,
                          const struct sockaddr *src,
                          const struct sockaddr *dest,
                          int socket_type,
                          const uint8_t *payload,
                          size_t payload_len,
                          unsigned long tcp_seqno,
                          unsigned long tcp_ack,
                          unsigned char tcp_ctl,
                          int unreachable,
                          size_t *_packet_len)
{
      uint8_t *base;
      uint8_t *buf;
      struct swrap_packet_frame *frame;
      union swrap_packet_ip *ip;
      union swrap_packet_payload *pay;
      size_t packet_len;
      size_t alloc_len;
      size_t nonwire_len = sizeof(*frame);
      size_t wire_hdr_len = 0;
      size_t wire_len = 0;
      size_t ip_hdr_len = 0;
      size_t icmp_hdr_len = 0;
      size_t icmp_truncate_len = 0;
      uint8_t protocol = 0, icmp_protocol = 0;
      const struct sockaddr_in *src_in = NULL;
      const struct sockaddr_in *dest_in = NULL;
#ifdef HAVE_IPV6
      const struct sockaddr_in6 *src_in6 = NULL;
      const struct sockaddr_in6 *dest_in6 = NULL;
#endif
      uint16_t src_port;
      uint16_t dest_port;

      switch (src->sa_family) {
      case AF_INET:
            src_in = (const struct sockaddr_in *)src;
            dest_in = (const struct sockaddr_in *)dest;
            src_port = src_in->sin_port;
            dest_port = dest_in->sin_port;
            ip_hdr_len = sizeof(ip->v4);
            break;
#ifdef HAVE_IPV6
      case AF_INET6:
            src_in6 = (const struct sockaddr_in6 *)src;
            dest_in6 = (const struct sockaddr_in6 *)dest;
            src_port = src_in6->sin6_port;
            dest_port = dest_in6->sin6_port;
            ip_hdr_len = sizeof(ip->v6);
            break;
#endif
      default:
            return NULL;
      }

      switch (socket_type) {
      case SOCK_STREAM:
            protocol = 0x06; /* TCP */
            wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
            wire_len = wire_hdr_len + payload_len;
            break;

      case SOCK_DGRAM:
            protocol = 0x11; /* UDP */
            wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
            wire_len = wire_hdr_len + payload_len;
            break;

      default:
            return NULL;
      }

      if (unreachable) {
            icmp_protocol = protocol;
            switch (src->sa_family) {
            case AF_INET:
                  protocol = 0x01; /* ICMPv4 */
                  icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
                  break;
#ifdef HAVE_IPV6
            case AF_INET6:
                  protocol = 0x3A; /* ICMPv6 */
                  icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
                  break;
#endif
            }
            if (wire_len > 64 ) {
                  icmp_truncate_len = wire_len - 64;
            }
            wire_hdr_len += icmp_hdr_len;
            wire_len += icmp_hdr_len;
      }

      packet_len = nonwire_len + wire_len;
      alloc_len = packet_len;
      if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
            alloc_len = SWRAP_PACKET_MIN_ALLOC;
      }

      base = (uint8_t *)malloc(alloc_len);
      if (!base) return NULL;

      buf = base;

      frame = (struct swrap_packet_frame *)buf;
      frame->seconds          = tval->tv_sec;
      frame->micro_seconds    = tval->tv_usec;
      frame->recorded_length  = wire_len - icmp_truncate_len;
      frame->full_length      = wire_len - icmp_truncate_len;
      buf += SWRAP_PACKET_FRAME_SIZE;

      ip = (union swrap_packet_ip *)buf;
      switch (src->sa_family) {
      case AF_INET:
            ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
            ip->v4.tos        = 0x00;
            ip->v4.packet_length    = htons(wire_len - icmp_truncate_len);
            ip->v4.identification   = htons(0xFFFF);
            ip->v4.flags            = 0x40; /* BIT 1 set - means don't fraqment */
            ip->v4.fragment         = htons(0x0000);
            ip->v4.ttl        = 0xFF;
            ip->v4.protocol         = protocol;
            ip->v4.hdr_checksum     = htons(0x0000);
            ip->v4.src_addr         = src_in->sin_addr.s_addr;
            ip->v4.dest_addr  = dest_in->sin_addr.s_addr;
            buf += SWRAP_PACKET_IP_V4_SIZE;
            break;
#ifdef HAVE_IPV6
      case AF_INET6:
            ip->v6.ver_prio         = 0x60; /* version 4 and 5 * 32 bit words */
            ip->v6.flow_label_high  = 0x00;
            ip->v6.flow_label_low   = 0x0000;
            ip->v6.payload_length   = htons(wire_len - icmp_truncate_len);//TODO
            ip->v6.next_header      = protocol;
            memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
            memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
            buf += SWRAP_PACKET_IP_V6_SIZE;
            break;
#endif
      }

      if (unreachable) {
            pay = (union swrap_packet_payload *)buf;
            switch (src->sa_family) {
            case AF_INET:
                  pay->icmp4.type         = 0x03; /* destination unreachable */
                  pay->icmp4.code         = 0x01; /* host unreachable */
                  pay->icmp4.checksum     = htons(0x0000);
                  pay->icmp4.unused = htonl(0x00000000);
                  buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;

                  /* set the ip header in the ICMP payload */
                  ip = (union swrap_packet_ip *)buf;
                  ip->v4.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
                  ip->v4.tos        = 0x00;
                  ip->v4.packet_length    = htons(wire_len - icmp_hdr_len);
                  ip->v4.identification   = htons(0xFFFF);
                  ip->v4.flags            = 0x40; /* BIT 1 set - means don't fraqment */
                  ip->v4.fragment         = htons(0x0000);
                  ip->v4.ttl        = 0xFF;
                  ip->v4.protocol         = icmp_protocol;
                  ip->v4.hdr_checksum     = htons(0x0000);
                  ip->v4.src_addr         = dest_in->sin_addr.s_addr;
                  ip->v4.dest_addr  = src_in->sin_addr.s_addr;
                  buf += SWRAP_PACKET_IP_V4_SIZE;

                  src_port = dest_in->sin_port;
                  dest_port = src_in->sin_port;
                  break;
#ifdef HAVE_IPV6
            case AF_INET6:
                  pay->icmp6.type         = 0x01; /* destination unreachable */
                  pay->icmp6.code         = 0x03; /* address unreachable */
                  pay->icmp6.checksum     = htons(0x0000);
                  pay->icmp6.unused = htonl(0x00000000);
                  buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;

                  /* set the ip header in the ICMP payload */
                  ip = (union swrap_packet_ip *)buf;
                  ip->v6.ver_prio         = 0x60; /* version 4 and 5 * 32 bit words */
                  ip->v6.flow_label_high  = 0x00;
                  ip->v6.flow_label_low   = 0x0000;
                  ip->v6.payload_length   = htons(wire_len - icmp_truncate_len);//TODO
                  ip->v6.next_header      = protocol;
                  memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
                  memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
                  buf += SWRAP_PACKET_IP_V6_SIZE;

                  src_port = dest_in6->sin6_port;
                  dest_port = src_in6->sin6_port;
                  break;
#endif
            }
      }

      pay = (union swrap_packet_payload *)buf;

      switch (socket_type) {
      case SOCK_STREAM:
            pay->tcp.source_port    = src_port;
            pay->tcp.dest_port      = dest_port;
            pay->tcp.seq_num  = htonl(tcp_seqno);
            pay->tcp.ack_num  = htonl(tcp_ack);
            pay->tcp.hdr_length     = 0x50; /* 5 * 32 bit words */
            pay->tcp.control  = tcp_ctl;
            pay->tcp.window         = htons(0x7FFF);
            pay->tcp.checksum = htons(0x0000);
            pay->tcp.urg            = htons(0x0000);
            buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;

            break;

      case SOCK_DGRAM:
            pay->udp.source_port    = src_port;
            pay->udp.dest_port      = dest_port;
            pay->udp.length         = htons(8 + payload_len);
            pay->udp.checksum = htons(0x0000);
            buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;

            break;
      }

      if (payload && payload_len > 0) {
            memcpy(buf, payload, payload_len);
      }

      *_packet_len = packet_len - icmp_truncate_len;
      return base;
}

static int swrap_get_pcap_fd(const char *fname)
{
      static int fd = -1;

      if (fd != -1) return fd;

      fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
      if (fd != -1) {
            struct swrap_file_hdr file_hdr;
            file_hdr.magic          = 0xA1B2C3D4;
            file_hdr.version_major  = 0x0002;   
            file_hdr.version_minor  = 0x0004;
            file_hdr.timezone = 0x00000000;
            file_hdr.sigfigs  = 0x00000000;
            file_hdr.frame_max_len  = SWRAP_FRAME_LENGTH_MAX;
            file_hdr.link_type      = 0x0065; /* 101 RAW IP */

            if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
                  close(fd);
                  fd = -1;
            }
            return fd;
      }

      fd = open(fname, O_WRONLY|O_APPEND, 0644);

      return fd;
}

static uint8_t *swrap_marshall_packet(struct socket_info *si,
                              const struct sockaddr *addr,
                              enum swrap_packet_type type,
                              const void *buf, size_t len,
                              size_t *packet_len)
{
      const struct sockaddr *src_addr;
      const struct sockaddr *dest_addr;
      unsigned long tcp_seqno = 0;
      unsigned long tcp_ack = 0;
      unsigned char tcp_ctl = 0;
      int unreachable = 0;

      struct timeval tv;

      switch (si->family) {
      case AF_INET:
            break;
#ifdef HAVE_IPV6
      case AF_INET6:
            break;
#endif
      default:
            return NULL;
      }

      switch (type) {
      case SWRAP_CONNECT_SEND:
            if (si->type != SOCK_STREAM) return NULL;

            src_addr = si->myname;
            dest_addr = addr;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x02; /* SYN */

            si->io.pck_snd += 1;

            break;

      case SWRAP_CONNECT_RECV:
            if (si->type != SOCK_STREAM) return NULL;

            dest_addr = si->myname;
            src_addr = addr;

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x12; /** SYN,ACK */

            si->io.pck_rcv += 1;

            break;

      case SWRAP_CONNECT_UNREACH:
            if (si->type != SOCK_STREAM) return NULL;

            dest_addr = si->myname;
            src_addr = addr;

            /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
            tcp_seqno = si->io.pck_snd - 1;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x02; /* SYN */
            unreachable = 1;

            break;

      case SWRAP_CONNECT_ACK:
            if (si->type != SOCK_STREAM) return NULL;

            src_addr = si->myname;
            dest_addr = addr;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x10; /* ACK */

            break;

      case SWRAP_ACCEPT_SEND:
            if (si->type != SOCK_STREAM) return NULL;

            dest_addr = si->myname;
            src_addr = addr;

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x02; /* SYN */

            si->io.pck_rcv += 1;

            break;

      case SWRAP_ACCEPT_RECV:
            if (si->type != SOCK_STREAM) return NULL;

            src_addr = si->myname;
            dest_addr = addr;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x12; /* SYN,ACK */

            si->io.pck_snd += 1;

            break;

      case SWRAP_ACCEPT_ACK:
            if (si->type != SOCK_STREAM) return NULL;

            dest_addr = si->myname;
            src_addr = addr;

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x10; /* ACK */

            break;

      case SWRAP_SEND:
            src_addr = si->myname;
            dest_addr = si->peername;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x18; /* PSH,ACK */

            si->io.pck_snd += len;

            break;

      case SWRAP_SEND_RST:
            dest_addr = si->myname;
            src_addr = si->peername;

            if (si->type == SOCK_DGRAM) {
                  return swrap_marshall_packet(si, si->peername,
                                SWRAP_SENDTO_UNREACH,
                                      buf, len, packet_len);
            }

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x14; /** RST,ACK */

            break;

      case SWRAP_PENDING_RST:
            dest_addr = si->myname;
            src_addr = si->peername;

            if (si->type == SOCK_DGRAM) {
                  return NULL;
            }

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x14; /* RST,ACK */

            break;

      case SWRAP_RECV:
            dest_addr = si->myname;
            src_addr = si->peername;

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x18; /* PSH,ACK */

            si->io.pck_rcv += len;

            break;

      case SWRAP_RECV_RST:
            dest_addr = si->myname;
            src_addr = si->peername;

            if (si->type == SOCK_DGRAM) {
                  return NULL;
            }

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x14; /* RST,ACK */

            break;

      case SWRAP_SENDTO:
            src_addr = si->myname;
            dest_addr = addr;

            si->io.pck_snd += len;

            break;

      case SWRAP_SENDTO_UNREACH:
            dest_addr = si->myname;
            src_addr = addr;

            unreachable = 1;

            break;

      case SWRAP_RECVFROM:
            dest_addr = si->myname;
            src_addr = addr;

            si->io.pck_rcv += len;

            break;

      case SWRAP_CLOSE_SEND:
            if (si->type != SOCK_STREAM) return NULL;

            src_addr = si->myname;
            dest_addr = si->peername;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x11; /* FIN, ACK */

            si->io.pck_snd += 1;

            break;

      case SWRAP_CLOSE_RECV:
            if (si->type != SOCK_STREAM) return NULL;

            dest_addr = si->myname;
            src_addr = si->peername;

            tcp_seqno = si->io.pck_rcv;
            tcp_ack = si->io.pck_snd;
            tcp_ctl = 0x11; /* FIN,ACK */

            si->io.pck_rcv += 1;

            break;

      case SWRAP_CLOSE_ACK:
            if (si->type != SOCK_STREAM) return NULL;

            src_addr = si->myname;
            dest_addr = si->peername;

            tcp_seqno = si->io.pck_snd;
            tcp_ack = si->io.pck_rcv;
            tcp_ctl = 0x10; /* ACK */

            break;
      default:
            return NULL;
      }

      swrapGetTimeOfDay(&tv);

      return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
                         (const uint8_t *)buf, len,
                         tcp_seqno, tcp_ack, tcp_ctl, unreachable,
                         packet_len);
}

static void swrap_dump_packet(struct socket_info *si,
                        const struct sockaddr *addr,
                        enum swrap_packet_type type,
                        const void *buf, size_t len)
{
      const char *file_name;
      uint8_t *packet;
      size_t packet_len = 0;
      int fd;

      file_name = socket_wrapper_pcap_file();
      if (!file_name) {
            return;
      }

      packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
      if (!packet) {
            return;
      }

      fd = swrap_get_pcap_fd(file_name);
      if (fd != -1) {
            if (write(fd, packet, packet_len) != packet_len) {
                  free(packet);
                  return;
            }
      }

      free(packet);
}

_PUBLIC_ int swrap_socket(int family, int type, int protocol)
{
      struct socket_info *si;
      int fd;
      int real_type = type;
#ifdef SOCK_CLOEXEC
      real_type &= ~SOCK_CLOEXEC;
#endif
#ifdef SOCK_NONBLOCK
      real_type &= ~SOCK_NONBLOCK;
#endif

      if (!socket_wrapper_dir()) {
            return real_socket(family, type, protocol);
      }

      switch (family) {
      case AF_INET:
#ifdef HAVE_IPV6
      case AF_INET6:
#endif
            break;
      case AF_UNIX:
            return real_socket(family, type, protocol);
      default:
            errno = EAFNOSUPPORT;
            return -1;
      }

      switch (real_type) {
      case SOCK_STREAM:
            break;
      case SOCK_DGRAM:
            break;
      default:
            errno = EPROTONOSUPPORT;
            return -1;
      }

      switch (protocol) {
      case 0:
            break;
      case 6:
            if (real_type == SOCK_STREAM) {
                  break;
            }
            /*fall through*/
      case 17:
            if (real_type == SOCK_DGRAM) {
                  break;
            }
            /*fall through*/
      default:
            errno = EPROTONOSUPPORT;
            return -1;
      }

      /* We must call real_socket with type, from the caller, not the version we removed
         SOCK_CLOEXEC and SOCK_NONBLOCK from */
      fd = real_socket(AF_UNIX, type, 0);

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

      si = (struct socket_info *)calloc(1, sizeof(struct socket_info));

      si->family = family;

      /* however, the rest of the socket_wrapper code expects just
       * the type, not the flags */
      si->type = real_type;
      si->protocol = protocol;
      si->fd = fd;

      SWRAP_DLIST_ADD(sockets, si);

      return si->fd;
}

_PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
      struct socket_info *parent_si, *child_si;
      int fd;
      struct sockaddr_un un_addr;
      socklen_t un_addrlen = sizeof(un_addr);
      struct sockaddr_un un_my_addr;
      socklen_t un_my_addrlen = sizeof(un_my_addr);
      struct sockaddr *my_addr;
      socklen_t my_addrlen, len;
      int ret;

      parent_si = find_socket_info(s);
      if (!parent_si) {
            return real_accept(s, addr, addrlen);
      }

      /* 
       * assume out sockaddr have the same size as the in parent
       * socket family
       */
      my_addrlen = socket_length(parent_si->family);
      if (my_addrlen <= 0) {
            errno = EINVAL;
            return -1;
      }

      my_addr = (struct sockaddr *)malloc(my_addrlen);
      if (my_addr == NULL) {
            return -1;
      }

      memset(&un_addr, 0, sizeof(un_addr));
      memset(&un_my_addr, 0, sizeof(un_my_addr));

      ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
      if (ret == -1) {
            free(my_addr);
            return ret;
      }

      fd = ret;

      len = my_addrlen;
      ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
                               parent_si->family, my_addr, &len);
      if (ret == -1) {
            free(my_addr);
            close(fd);
            return ret;
      }

      child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
      memset(child_si, 0, sizeof(*child_si));

      child_si->fd = fd;
      child_si->family = parent_si->family;
      child_si->type = parent_si->type;
      child_si->protocol = parent_si->protocol;
      child_si->bound = 1;
      child_si->is_server = 1;
      child_si->connected = 1;

      child_si->peername_len = len;
      child_si->peername = sockaddr_dup(my_addr, len);

      if (addr != NULL && addrlen != NULL) {
          *addrlen = len;
          if (*addrlen >= len)
            memcpy(addr, my_addr, len);
          *addrlen = 0;
      }

      ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
      if (ret == -1) {
            free(child_si);
            close(fd);
            return ret;
      }

      len = my_addrlen;
      ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
                               child_si->family, my_addr, &len);
      if (ret == -1) {
            free(child_si);
            free(my_addr);
            close(fd);
            return ret;
      }

      child_si->myname_len = len;
      child_si->myname = sockaddr_dup(my_addr, len);
      free(my_addr);

      SWRAP_DLIST_ADD(sockets, child_si);

      swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
      swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
      swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);

      return fd;
}

static int autobind_start_init;
static int autobind_start;

/* using sendto() or connect() on an unbound socket would give the
   recipient no way to reply, as unlike UDP and TCP, a unix domain
   socket can't auto-assign emphemeral port numbers, so we need to
   assign it here.
   Note: this might change the family from ipv6 to ipv4
*/
static int swrap_auto_bind(struct socket_info *si, int family)
{
      struct sockaddr_un un_addr;
      int i;
      char type;
      int ret;
      int port;
      struct stat st;

      if (autobind_start_init != 1) {
            autobind_start_init = 1;
            autobind_start = getpid();
            autobind_start %= 50000;
            autobind_start += 10000;
      }

      un_addr.sun_family = AF_UNIX;

      switch (family) {
      case AF_INET: {
            struct sockaddr_in in;

            switch (si->type) {
            case SOCK_STREAM:
                  type = SOCKET_TYPE_CHAR_TCP;
                  break;
            case SOCK_DGRAM:
                  type = SOCKET_TYPE_CHAR_UDP;
                  break;
            default:
                errno = ESOCKTNOSUPPORT;
                return -1;
            }

            memset(&in, 0, sizeof(in));
            in.sin_family = AF_INET;
            in.sin_addr.s_addr = htonl(127<<24 | 
                                 socket_wrapper_default_iface());

            si->myname_len = sizeof(in);
            si->myname = sockaddr_dup(&in, si->myname_len);
            break;
      }
#ifdef HAVE_IPV6
      case AF_INET6: {
            struct sockaddr_in6 in6;

            if (si->family != family) {
                  errno = ENETUNREACH;
                  return -1;
            }

            switch (si->type) {
            case SOCK_STREAM:
                  type = SOCKET_TYPE_CHAR_TCP_V6;
                  break;
            case SOCK_DGRAM:
                  type = SOCKET_TYPE_CHAR_UDP_V6;
                  break;
            default:
                  errno = ESOCKTNOSUPPORT;
                  return -1;
            }

            memset(&in6, 0, sizeof(in6));
            in6.sin6_family = AF_INET6;
            in6.sin6_addr = *swrap_ipv6();
            in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
            si->myname_len = sizeof(in6);
            si->myname = sockaddr_dup(&in6, si->myname_len);
            break;
      }
#endif
      default:
            errno = ESOCKTNOSUPPORT;
            return -1;
      }

      if (autobind_start > 60000) {
            autobind_start = 10000;
      }

      for (i=0;i<1000;i++) {
            port = autobind_start + i;
            snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), 
                   "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
                   type, socket_wrapper_default_iface(), port);
            if (stat(un_addr.sun_path, &st) == 0) continue;
            
            ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
            if (ret == -1) return ret;

            si->tmp_path = strdup(un_addr.sun_path);
            si->bound = 1;
            autobind_start = port + 1;
            break;
      }
      if (i == 1000) {
            errno = ENFILE;
            return -1;
      }

      si->family = family;
      set_port(si->family, port, si->myname);

      return 0;
}


_PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
{
      int ret;
      struct sockaddr_un un_addr;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_connect(s, serv_addr, addrlen);
      }

      if (si->bound == 0) {
            ret = swrap_auto_bind(si, serv_addr->sa_family);
            if (ret == -1) return -1;
      }

      if (si->family != serv_addr->sa_family) {
            errno = EINVAL;
            return -1;
      }

      ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
      if (ret == -1) return -1;

      if (si->type == SOCK_DGRAM) {
            si->defer_connect = 1;
            ret = 0;
      } else {
            swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);

            ret = real_connect(s, (struct sockaddr *)&un_addr,
                           sizeof(struct sockaddr_un));
      }

      /* to give better errors */
      if (ret == -1 && errno == ENOENT) {
            errno = EHOSTUNREACH;
      }

      if (ret == 0) {
            si->peername_len = addrlen;
            si->peername = sockaddr_dup(serv_addr, addrlen);
            si->connected = 1;

            swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
            swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
      } else {
            swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
      }

      return ret;
}

_PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
{
      int ret;
      struct sockaddr_un un_addr;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_bind(s, myaddr, addrlen);
      }

      si->myname_len = addrlen;
      si->myname = sockaddr_dup(myaddr, addrlen);

      ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
      if (ret == -1) return -1;

      unlink(un_addr.sun_path);

      ret = real_bind(s, (struct sockaddr *)&un_addr,
                  sizeof(struct sockaddr_un));

      if (ret == 0) {
            si->bound = 1;
      }

      return ret;
}

_PUBLIC_ int swrap_listen(int s, int backlog)
{
      int ret;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_listen(s, backlog);
      }

      ret = real_listen(s, backlog);

      return ret;
}

_PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
{
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_getpeername(s, name, addrlen);
      }

      if (!si->peername)
      {
            errno = ENOTCONN;
            return -1;
      }

      memcpy(name, si->peername, si->peername_len);
      *addrlen = si->peername_len;

      return 0;
}

_PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
{
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_getsockname(s, name, addrlen);
      }

      memcpy(name, si->myname, si->myname_len);
      *addrlen = si->myname_len;

      return 0;
}

_PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
{
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_getsockopt(s, level, optname, optval, optlen);
      }

      if (level == SOL_SOCKET) {
            return real_getsockopt(s, level, optname, optval, optlen);
      } 

      errno = ENOPROTOOPT;
      return -1;
}

_PUBLIC_ int swrap_setsockopt(int s, int  level,  int  optname,  const  void  *optval, socklen_t optlen)
{
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_setsockopt(s, level, optname, optval, optlen);
      }

      if (level == SOL_SOCKET) {
            return real_setsockopt(s, level, optname, optval, optlen);
      }

      switch (si->family) {
      case AF_INET:
            return 0;
#ifdef HAVE_IPV6
      case AF_INET6:
            return 0;
#endif
      default:
            errno = ENOPROTOOPT;
            return -1;
      }
}

_PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
{
      struct sockaddr_un un_addr;
      socklen_t un_addrlen = sizeof(un_addr);
      int ret;
      struct socket_info *si = find_socket_info(s);
      struct sockaddr_storage ss;
      socklen_t ss_len = sizeof(ss);

      if (!si) {
            return real_recvfrom(s, buf, len, flags, from, fromlen);
      }

      if (!from) {
            from = (struct sockaddr *)&ss;
            fromlen = &ss_len;
      }

      if (si->type == SOCK_STREAM) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            len = MIN(len, 1500);
      }

      /* irix 6.4 forgets to null terminate the sun_path string :-( */
      memset(&un_addr, 0, sizeof(un_addr));
      ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
      if (ret == -1) 
            return ret;

      if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
                             si->family, from, fromlen) == -1) {
            return -1;
      }

      swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);

      return ret;
}


_PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
{
      struct sockaddr_un un_addr;
      int ret;
      struct socket_info *si = find_socket_info(s);
      int bcast = 0;

      if (!si) {
            return real_sendto(s, buf, len, flags, to, tolen);
      }

      if (si->connected) {
            if (to) {
                  errno = EISCONN;
                  return -1;
            }

            to = si->peername;
            tolen = si->peername_len;
      }

      switch (si->type) {
      case SOCK_STREAM:
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            len = MIN(len, 1500);
      
            ret = real_send(s, buf, len, flags);
            break;
      case SOCK_DGRAM:
            if (si->bound == 0) {
                  ret = swrap_auto_bind(si, si->family);
                  if (ret == -1) return -1;
            }
            
            ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
            if (ret == -1) return -1;
            
            if (bcast) {
                  struct stat st;
                  unsigned int iface;
                  unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
                  char type;
                  
                  type = SOCKET_TYPE_CHAR_UDP;
                  
                  for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
                        snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT, 
                               socket_wrapper_dir(), type, iface, prt);
                        if (stat(un_addr.sun_path, &st) != 0) continue;
                        
                        /* ignore the any errors in broadcast sends */
                        real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
                  }
                  
                  swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
                  
                  return len;
            }

            if (si->defer_connect) {
                  ret = real_connect(s, (struct sockaddr *)&un_addr,
                                 sizeof(un_addr));

                  /* to give better errors */
                  if (ret == -1 && errno == ENOENT) {
                        errno = EHOSTUNREACH;
                  }

                  if (ret == -1) {
                        return ret;
                  }
                  si->defer_connect = 0;
            }

            ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
            break;
      default:
            ret = -1;
            errno = EHOSTUNREACH;
            break;
      }
            
      /* to give better errors */
      if (ret == -1 && errno == ENOENT) {
            errno = EHOSTUNREACH;
      }

      if (ret == -1) {
            swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
            swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
      } else {
            swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
      }

      return ret;
}

_PUBLIC_ int swrap_ioctl(int s, int r, void *p)
{
      int ret;
      struct socket_info *si = find_socket_info(s);
      int value;

      if (!si) {
            return real_ioctl(s, r, p);
      }

      ret = real_ioctl(s, r, p);

      switch (r) {
      case FIONREAD:
            value = *((int *)p);
            if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
                  swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
            } else if (value == 0) { /* END OF FILE */
                  swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
            }
            break;
      }

      return ret;
}

_PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
{
      int ret;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_recv(s, buf, len, flags);
      }

      if (si->type == SOCK_STREAM) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            len = MIN(len, 1500);
      }

      ret = real_recv(s, buf, len, flags);
      if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret == 0) { /* END OF FILE */
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret > 0) {
            swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
      }

      return ret;
}

_PUBLIC_ ssize_t swrap_read(int s, void *buf, size_t len)
{
      int ret;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_read(s, buf, len);
      }

      if (si->type == SOCK_STREAM) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            len = MIN(len, 1500);
      }

      ret = real_read(s, buf, len);
      if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret == 0) { /* END OF FILE */
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret > 0) {
            swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
      }

      return ret;
}


_PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
{
      int ret;
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_send(s, buf, len, flags);
      }

      if (si->type == SOCK_STREAM) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            len = MIN(len, 1500);
      }

      if (si->defer_connect) {
            struct sockaddr_un un_addr;
            int bcast = 0;

            if (si->bound == 0) {
                  ret = swrap_auto_bind(si, si->family);
                  if (ret == -1) return -1;
            }

            ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
                                   &un_addr, 0, &bcast);
            if (ret == -1) return -1;

            ret = real_connect(s, (struct sockaddr *)&un_addr,
                           sizeof(un_addr));

            /* to give better errors */
            if (ret == -1 && errno == ENOENT) {
                  errno = EHOSTUNREACH;
            }

            if (ret == -1) {
                  return ret;
            }
            si->defer_connect = 0;
      }

      ret = real_send(s, buf, len, flags);

      if (ret == -1) {
            swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
            swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
      } else {
            swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
      }

      return ret;
}

_PUBLIC_ ssize_t swrap_sendmsg(int s, const struct msghdr *msg, int flags)
{
      int ret;
      uint8_t *buf;
      off_t ofs = 0;
      size_t i;
      size_t remain;
      
      struct socket_info *si = find_socket_info(s);

      if (!si) {
            return real_sendmsg(s, msg, flags);
      }

      if (si->defer_connect) {
            struct sockaddr_un un_addr;
            int bcast = 0;

            if (si->bound == 0) {
                  ret = swrap_auto_bind(si, si->family);
                  if (ret == -1) return -1;
            }

            ret = sockaddr_convert_to_un(si, si->peername, si->peername_len,
                                   &un_addr, 0, &bcast);
            if (ret == -1) return -1;

            ret = real_connect(s, (struct sockaddr *)&un_addr,
                           sizeof(un_addr));

            /* to give better errors */
            if (ret == -1 && errno == ENOENT) {
                  errno = EHOSTUNREACH;
            }

            if (ret == -1) {
                  return ret;
            }
            si->defer_connect = 0;
      }

      ret = real_sendmsg(s, msg, flags);
      remain = ret;
            
      /* we capture it as one single packet */
      buf = (uint8_t *)malloc(ret);
      if (!buf) {
            /* we just not capture the packet */
            errno = 0;
            return ret;
      }
      
      for (i=0; i < msg->msg_iovlen; i++) {
            size_t this_time = MIN(remain, msg->msg_iov[i].iov_len);
            memcpy(buf + ofs,
                   msg->msg_iov[i].iov_base,
                   this_time);
            ofs += this_time;
            remain -= this_time;
      }
      
      swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
      free(buf);
      if (ret == -1) {
            swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
      }

      return ret;
}

int swrap_readv(int s, const struct iovec *vector, size_t count)
{
      int ret;
      struct socket_info *si = find_socket_info(s);
      struct iovec v;

      if (!si) {
            return real_readv(s, vector, count);
      }

      if (si->type == SOCK_STREAM && count > 0) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            size_t i, len = 0;
            
            for (i=0; i < count; i++) {
                  size_t nlen;
                  nlen = len + vector[i].iov_len;
                  if (nlen > 1500) {
                        break;
                  }
            }
            count = i;
            if (count == 0) {
                  v = vector[0];
                  v.iov_len = MIN(v.iov_len, 1500);
                  vector = &v;
                  count = 1;
            }
      }

      ret = real_readv(s, vector, count);
      if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret == 0) { /* END OF FILE */
            swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
      } else if (ret > 0) {
            uint8_t *buf;
            off_t ofs = 0;
            size_t i;
            size_t remain = ret;

            /* we capture it as one single packet */
            buf = (uint8_t *)malloc(ret);
            if (!buf) {
                  /* we just not capture the packet */
                  errno = 0;
                  return ret;
            }

            for (i=0; i < count; i++) {
                  size_t this_time = MIN(remain, vector[i].iov_len);
                  memcpy(buf + ofs,
                         vector[i].iov_base,
                         this_time);
                  ofs += this_time;
                  remain -= this_time;
            }

            swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
            free(buf);
      }

      return ret;
}

int swrap_writev(int s, const struct iovec *vector, size_t count)
{
      int ret;
      struct socket_info *si = find_socket_info(s);
      struct iovec v;

      if (!si) {
            return real_writev(s, vector, count);
      }

      if (si->type == SOCK_STREAM && count > 0) {
            /* cut down to 1500 byte packets for stream sockets,
             * which makes it easier to format PCAP capture files
             * (as the caller will simply continue from here) */
            size_t i, len = 0;

            for (i=0; i < count; i++) {
                  size_t nlen;
                  nlen = len + vector[i].iov_len;
                  if (nlen > 1500) {
                        break;
                  }
            }
            count = i;
            if (count == 0) {
                  v = vector[0];
                  v.iov_len = MIN(v.iov_len, 1500);
                  vector = &v;
                  count = 1;
            }
      }

      ret = real_writev(s, vector, count);
      if (ret == -1) {
            swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
      } else {
            uint8_t *buf;
            off_t ofs = 0;
            size_t i;
            size_t remain = ret;

            /* we capture it as one single packet */
            buf = (uint8_t *)malloc(ret);
            if (!buf) {
                  /* we just not capture the packet */
                  errno = 0;
                  return ret;
            }

            for (i=0; i < count; i++) {
                  size_t this_time = MIN(remain, vector[i].iov_len);
                  memcpy(buf + ofs,
                         vector[i].iov_base,
                         this_time);
                  ofs += this_time;
                  remain -= this_time;
            }

            swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
            free(buf);
      }

      return ret;
}

_PUBLIC_ int swrap_close(int fd)
{
      struct socket_info *si = find_socket_info(fd);
      int ret;

      if (!si) {
            return real_close(fd);
      }

      SWRAP_DLIST_REMOVE(sockets, si);

      if (si->myname && si->peername) {
            swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
      }

      ret = real_close(fd);

      if (si->myname && si->peername) {
            swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
            swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
      }

      if (si->path) free(si->path);
      if (si->myname) free(si->myname);
      if (si->peername) free(si->peername);
      if (si->tmp_path) {
            unlink(si->tmp_path);
            free(si->tmp_path);
      }
      free(si);

      return ret;
}

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