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67e429dfb4741dafd6d57846c9de960cd80379b0
heimdal/lib/roken/socket_wrapper.c
Love Hörnquist Åstrand b20afc22f7 Implement swrap_dup too. 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@21592 ec53bebd-3082-4978-b11e-865c3cabbd6b
2007-07-16 17:28:03 +00:00

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41 KiB
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/*
* Copyright (C) Jelmer Vernooij 2005 <jelmer@samba.org>
* Copyright (C) Stefan Metzmacher 2006 <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.
*/
#define SOCKET_WRAPPER_NOT_REPLACE
#ifdef _SAMBA_BUILD_
#include "includes.h"
#include "system/network.h"
#include "system/filesys.h"
#ifdef malloc
#undef malloc
#endif
#ifdef calloc
#undef calloc
#endif
#ifdef strdup
#undef strdup
#endif
#else /* _SAMBA_BUILD_ */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#undef SOCKET_WRAPPER_REPLACE
#include <sys/types.h>
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#elif defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#else
#include <time.h>
#endif
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#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 "roken.h"
#include "socket_wrapper.h"
#define HAVE_GETTIMEOFDAY_TZ 1
#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_ioctl ioctl
#define real_recv recv
#define real_send send
#define real_socket socket
#define real_close close
#define real_dup dup
#define real_dup2 dup2
#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
#define SW_IPV6_ADDRESS 1
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 int 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 -1;
}
struct socket_info
{
int fd;
int family;
int type;
int protocol;
int bound;
int bcast;
int is_server;
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;
static 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;
}
static 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.s6_addr[0] = SW_IPV6_ADDRESS;
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 (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 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;
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);
iface = SW_IPV6_ADDRESS;
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;
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);
iface = SW_IPV6_ADDRESS;
break;
}
#endif
default:
errno = ENETUNREACH;
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);
}
}
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 {
unsigned long magic;
unsigned short version_major;
unsigned short version_minor;
long timezone;
unsigned long sigfigs;
unsigned long frame_max_len;
#define SWRAP_FRAME_LENGTH_MAX 0xFFFF
unsigned long link_type;
};
#define SWRAP_FILE_HDR_SIZE 24
struct swrap_packet {
struct {
unsigned long seconds;
unsigned long micro_seconds;
unsigned long recorded_length;
unsigned long full_length;
} frame;
#define SWRAP_PACKET__FRAME_SIZE 16
struct {
struct {
unsigned char ver_hdrlen;
unsigned char tos;
unsigned short packet_length;
unsigned short identification;
unsigned char flags;
unsigned char fragment;
unsigned char ttl;
unsigned char protocol;
unsigned short hdr_checksum;
unsigned long src_addr;
unsigned long dest_addr;
} hdr;
#define SWRAP_PACKET__IP_HDR_SIZE 20
union {
struct {
unsigned short source_port;
unsigned short dest_port;
unsigned long seq_num;
unsigned long ack_num;
unsigned char hdr_length;
unsigned char control;
unsigned short window;
unsigned short checksum;
unsigned short urg;
} tcp;
#define SWRAP_PACKET__IP_P_TCP_SIZE 20
struct {
unsigned short source_port;
unsigned short dest_port;
unsigned short length;
unsigned short checksum;
} udp;
#define SWRAP_PACKET__IP_P_UDP_SIZE 8
struct {
unsigned char type;
unsigned char code;
unsigned short checksum;
unsigned long unused;
} icmp;
#define SWRAP_PACKET__IP_P_ICMP_SIZE 8
} p;
} ip;
};
#define SWRAP_PACKET_SIZE 56
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 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(p) != SWRAP_PACKET_SIZE) {
return NULL;
}
if (sizeof(p.frame) != SWRAP_PACKET__FRAME_SIZE) {
return NULL;
}
if (sizeof(p.ip.hdr) != SWRAP_PACKET__IP_HDR_SIZE) {
return NULL;
}
if (sizeof(p.ip.p.tcp) != SWRAP_PACKET__IP_P_TCP_SIZE) {
return NULL;
}
if (sizeof(p.ip.p.udp) != SWRAP_PACKET__IP_P_UDP_SIZE) {
return NULL;
}
if (sizeof(p.ip.p.icmp) != SWRAP_PACKET__IP_P_ICMP_SIZE) {
return NULL;
}
s = getenv("SOCKET_WRAPPER_PCAP_FILE");
if (s == NULL) {
return NULL;
}
if (strncmp(s, "./", 2) == 0) {
s += 2;
}
return s;
}
static struct swrap_packet *swrap_packet_init(struct timeval *tval,
const struct sockaddr_in *src_addr,
const struct sockaddr_in *dest_addr,
int socket_type,
const unsigned char *payload,
size_t payload_len,
unsigned long tcp_seq,
unsigned long tcp_ack,
unsigned char tcp_ctl,
int unreachable,
size_t *_packet_len)
{
struct swrap_packet *ret;
struct swrap_packet *packet;
size_t packet_len;
size_t alloc_len;
size_t nonwire_len = sizeof(packet->frame);
size_t wire_hdr_len = 0;
size_t wire_len = 0;
size_t icmp_hdr_len = 0;
size_t icmp_truncate_len = 0;
unsigned char protocol = 0, icmp_protocol = 0;
unsigned short src_port = src_addr->sin_port;
unsigned short dest_port = dest_addr->sin_port;
switch (socket_type) {
case SOCK_STREAM:
protocol = 0x06; /* TCP */
wire_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.tcp);
wire_len = wire_hdr_len + payload_len;
break;
case SOCK_DGRAM:
protocol = 0x11; /* UDP */
wire_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.udp);
wire_len = wire_hdr_len + payload_len;
break;
}
if (unreachable) {
icmp_protocol = protocol;
protocol = 0x01; /* ICMP */
if (wire_len > 64 ) {
icmp_truncate_len = wire_len - 64;
}
icmp_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.icmp);
wire_hdr_len += icmp_hdr_len;
wire_len += icmp_hdr_len;
}
packet_len = nonwire_len + wire_len;
alloc_len = packet_len;
if (alloc_len < sizeof(struct swrap_packet)) {
alloc_len = sizeof(struct swrap_packet);
}
ret = (struct swrap_packet *)malloc(alloc_len);
if (!ret) return NULL;
packet = ret;
packet->frame.seconds = tval->tv_sec;
packet->frame.micro_seconds = tval->tv_usec;
packet->frame.recorded_length = wire_len - icmp_truncate_len;
packet->frame.full_length = wire_len - icmp_truncate_len;
packet->ip.hdr.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
packet->ip.hdr.tos = 0x00;
packet->ip.hdr.packet_length = htons(wire_len - icmp_truncate_len);
packet->ip.hdr.identification = htons(0xFFFF);
packet->ip.hdr.flags = 0x40; /* BIT 1 set - means don't fraqment */
packet->ip.hdr.fragment = htons(0x0000);
packet->ip.hdr.ttl = 0xFF;
packet->ip.hdr.protocol = protocol;
packet->ip.hdr.hdr_checksum = htons(0x0000);
packet->ip.hdr.src_addr = src_addr->sin_addr.s_addr;
packet->ip.hdr.dest_addr = dest_addr->sin_addr.s_addr;
if (unreachable) {
packet->ip.p.icmp.type = 0x03; /* destination unreachable */
packet->ip.p.icmp.code = 0x01; /* host unreachable */
packet->ip.p.icmp.checksum = htons(0x0000);
packet->ip.p.icmp.unused = htonl(0x00000000);
/* set the ip header in the ICMP payload */
packet = (struct swrap_packet *)(((unsigned char *)ret) + icmp_hdr_len);
packet->ip.hdr.ver_hdrlen = 0x45; /* version 4 and 5 * 32 bit words */
packet->ip.hdr.tos = 0x00;
packet->ip.hdr.packet_length = htons(wire_len - icmp_hdr_len);
packet->ip.hdr.identification = htons(0xFFFF);
packet->ip.hdr.flags = 0x40; /* BIT 1 set - means don't fraqment */
packet->ip.hdr.fragment = htons(0x0000);
packet->ip.hdr.ttl = 0xFF;
packet->ip.hdr.protocol = icmp_protocol;
packet->ip.hdr.hdr_checksum = htons(0x0000);
packet->ip.hdr.src_addr = dest_addr->sin_addr.s_addr;
packet->ip.hdr.dest_addr = src_addr->sin_addr.s_addr;
src_port = dest_addr->sin_port;
dest_port = src_addr->sin_port;
}
switch (socket_type) {
case SOCK_STREAM:
packet->ip.p.tcp.source_port = src_port;
packet->ip.p.tcp.dest_port = dest_port;
packet->ip.p.tcp.seq_num = htonl(tcp_seq);
packet->ip.p.tcp.ack_num = htonl(tcp_ack);
packet->ip.p.tcp.hdr_length = 0x50; /* 5 * 32 bit words */
packet->ip.p.tcp.control = tcp_ctl;
packet->ip.p.tcp.window = htons(0x7FFF);
packet->ip.p.tcp.checksum = htons(0x0000);
packet->ip.p.tcp.urg = htons(0x0000);
break;
case SOCK_DGRAM:
packet->ip.p.udp.source_port = src_addr->sin_port;
packet->ip.p.udp.dest_port = dest_addr->sin_port;
packet->ip.p.udp.length = htons(8 + payload_len);
packet->ip.p.udp.checksum = htons(0x0000);
break;
}
if (payload && payload_len > 0) {
unsigned char *p = (unsigned char *)ret;
p += nonwire_len;
p += wire_hdr_len;
memcpy(p, payload, payload_len);
}
*_packet_len = packet_len - icmp_truncate_len;
return ret;
}
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 */
write(fd, &file_hdr, sizeof(file_hdr));
return fd;
}
fd = open(fname, O_WRONLY|O_APPEND, 0644);
return fd;
}
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 struct sockaddr_in *src_addr;
const struct sockaddr_in *dest_addr;
const char *file_name;
unsigned long tcp_seq = 0;
unsigned long tcp_ack = 0;
unsigned char tcp_ctl = 0;
int unreachable = 0;
struct timeval tv;
struct swrap_packet *packet;
size_t packet_len = 0;
int fd;
file_name = socket_wrapper_pcap_file();
if (!file_name) {
return;
}
switch (si->family) {
case AF_INET:
#ifdef HAVE_IPV6
case AF_INET6:
#endif
break;
default:
return;
}
switch (type) {
case SWRAP_CONNECT_SEND:
if (si->type != SOCK_STREAM) return;
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)addr;
tcp_seq = 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;
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
tcp_seq = 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;
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
/* Unreachable: resend the data of SWRAP_CONNECT_SEND */
tcp_seq = 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;
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)addr;
tcp_seq = 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;
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
tcp_seq = 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;
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)addr;
tcp_seq = 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;
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
tcp_seq = si->io.pck_rcv;
tcp_ack = si->io.pck_snd;
tcp_ctl = 0x10; /* ACK */
break;
case SWRAP_SEND:
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)si->peername;
tcp_seq = 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 = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)si->peername;
if (si->type == SOCK_DGRAM) {
swrap_dump_packet(si, si->peername,
SWRAP_SENDTO_UNREACH,
buf, len);
return;
}
tcp_seq = si->io.pck_rcv;
tcp_ack = si->io.pck_snd;
tcp_ctl = 0x14; /** RST,ACK */
break;
case SWRAP_PENDING_RST:
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)si->peername;
if (si->type == SOCK_DGRAM) {
return;
}
tcp_seq = si->io.pck_rcv;
tcp_ack = si->io.pck_snd;
tcp_ctl = 0x14; /* RST,ACK */
break;
case SWRAP_RECV:
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)si->peername;
tcp_seq = 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 = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)si->peername;
if (si->type == SOCK_DGRAM) {
return;
}
tcp_seq = si->io.pck_rcv;
tcp_ack = si->io.pck_snd;
tcp_ctl = 0x14; /* RST,ACK */
break;
case SWRAP_SENDTO:
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)addr;
si->io.pck_snd += len;
break;
case SWRAP_SENDTO_UNREACH:
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
unreachable = 1;
break;
case SWRAP_RECVFROM:
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)addr;
si->io.pck_rcv += len;
break;
case SWRAP_CLOSE_SEND:
if (si->type != SOCK_STREAM) return;
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)si->peername;
tcp_seq = 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;
dest_addr = (const struct sockaddr_in *)si->myname;
src_addr = (const struct sockaddr_in *)si->peername;
tcp_seq = 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;
src_addr = (const struct sockaddr_in *)si->myname;
dest_addr = (const struct sockaddr_in *)si->peername;
tcp_seq = si->io.pck_snd;
tcp_ack = si->io.pck_rcv;
tcp_ctl = 0x10; /* ACK */
break;
default:
return;
}
swrapGetTimeOfDay(&tv);
packet = swrap_packet_init(&tv, src_addr, dest_addr, si->type,
(const unsigned char *)buf, len,
tcp_seq, tcp_ack, tcp_ctl, unreachable,
&packet_len);
if (!packet) {
return;
}
fd = swrap_get_pcap_fd(file_name);
if (fd != -1) {
write(fd, packet, packet_len);
}
free(packet);
}
_PUBLIC_ int swrap_socket(int family, int type, int protocol)
{
struct socket_info *si;
int fd;
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 (type) {
case SOCK_STREAM:
break;
case SOCK_DGRAM:
break;
default:
errno = EPROTONOSUPPORT;
return -1;
}
#if 0
switch (protocol) {
case 0:
break;
default:
errno = EPROTONOSUPPORT;
return -1;
}
#endif
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;
si->type = 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 = 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->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 */
static int swrap_auto_bind(struct socket_info *si)
{
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 (si->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;
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.s6_addr[0] = SW_IPV6_ADDRESS;
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;
}
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);
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;
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);
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;
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);
if (!si) {
return real_recvfrom(s, buf, len, flags, from, fromlen);
}
/* 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);
}
switch (si->type) {
case SOCK_STREAM:
ret = real_send(s, buf, len, flags);
break;
case SOCK_DGRAM:
if (si->bound == 0) {
ret = swrap_auto_bind(si);
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;
}
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);
}
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 {
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);
}
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_ 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;
}
static int
dup_internal(const struct socket_info *si_oldd, int fd)
{
struct socket_info *si_newd;
si_newd = (struct socket_info *)calloc(1, sizeof(struct socket_info));
si_newd->fd = fd;
si_newd->family = si_oldd->family;
si_newd->type = si_oldd->type;
si_newd->protocol = si_oldd->protocol;
si_newd->bound = si_oldd->bound;
si_newd->bcast = si_oldd->bcast;
if (si_oldd->path)
si_newd->path = strdup(si_oldd->path);
if (si_oldd->tmp_path)
si_newd->tmp_path = strdup(si_oldd->tmp_path);
si_newd->myname =
sockaddr_dup(si_oldd->myname, si_oldd->myname_len);
si_newd->myname_len = si_oldd->myname_len;
si_newd->peername =
sockaddr_dup(si_oldd->peername, si_oldd->peername_len);
si_newd->peername_len = si_oldd->peername_len;
si_newd->io = si_oldd->io;
SWRAP_DLIST_ADD(sockets, si_newd);
return fd;
}
_PUBLIC_ int swrap_dup(int oldd)
{
struct socket_info *si;
int fd;
si = find_socket_info(oldd);
if (si == NULL)
return real_dup(oldd);
fd = real_dup(si->fd);
if (fd < 0)
return fd;
return dup_internal(si, fd);
}
_PUBLIC_ int swrap_dup2(int oldd, int newd)
{
struct socket_info *si_newd, *si_oldd;
int fd;
if (newd == oldd)
return newd;
si_oldd = find_socket_info(oldd);
si_newd = find_socket_info(newd);
if (si_oldd == NULL && si_newd == NULL)
return real_dup2(oldd, newd);
fd = real_dup2(si_oldd->fd, newd);
if (fd < 0)
return fd;
/* close new socket first */
if (si_newd)
swrap_close(newd);
return dup_internal(si_oldd, fd);
}
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